From f80d685f453fa3dbbd1f2bc8f314c7172bb04101 Mon Sep 17 00:00:00 2001
From: Michael Haselberger <Michael.HASELBERGER@bachmann.info>
Date: Wed, 9 Apr 2025 10:09:30 +0200
Subject: [PATCH 1/9] add fb_init calls to init fns

---
 src/lowering/initializers.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/lowering/initializers.rs b/src/lowering/initializers.rs
index 6b30794814..98410dc79d 100644
--- a/src/lowering/initializers.rs
+++ b/src/lowering/initializers.rs
@@ -195,6 +195,22 @@ fn create_init_unit(
         })
         .collect::<Vec<_>>();
 
+    if let Some(fbinit) = lowerer
+        .index
+        .find_method(container_name, "fb_init")
+        .and_then(|it| it.find_implementation(&lowerer.index))
+    {
+        let base = create_member_reference("self", id_provider.clone(), None);
+        let op = create_member_reference(
+            &fbinit.get_call_name().rsplit_once('.').map(|(_, name)| name).unwrap(),
+            id_provider.clone(),
+            Some(base),
+        );
+        let call_statement =
+            AstFactory::create_call_statement(op, None, id_provider.next_id(), location.clone());
+        statements.push(call_statement);
+    }
+
     let member_init_calls = lowerer
         .index
         .get_container_members(container_name)

From 4617d1a0a3ba9a89719fd365be916397749a95ae Mon Sep 17 00:00:00 2001
From: Michael Haselberger <Michael.HASELBERGER@bachmann.info>
Date: Wed, 9 Apr 2025 17:01:47 +0200
Subject: [PATCH 2/9] i hate this

a lot
---
 ...n_different_locations_with_debug_info.snap |  11 +
 ...files__multiple_files_with_debug_info.snap |  11 +
 ...iles__multiple_source_files_generated.snap |  11 +
 compiler/plc_lowering/src/inheritance.rs      |  24 +-
 src/codegen/tests/address_tests.rs            |  20 +
 src/codegen/tests/code_gen_tests.rs           |  67 +++
 src/codegen/tests/debug_tests.rs              |  19 +-
 ...l_is_not_added_as_external_subroutine.snap |  27 ++
 ...g__implementation_added_as_subroutine.snap |  18 +
 ...on_function_pous_have_struct_as_param.snap |  18 +
 ...temp_variables_in_pous_added_as_local.snap |  18 +
 src/codegen/tests/directaccess_test.rs        |  56 ++-
 src/codegen/tests/expression_tests.rs         |  10 +
 .../complex_initializers.rs                   | 391 ++++++++++++++++++
 .../global_initializers.rs                    |  30 +-
 ...lues_in_global_variables_out_of_order.snap |  24 ++
 ..._class_struct_initialized_in_function.snap |  11 +
 ..._block_struct_initialized_in_function.snap |  24 ++
 ..._is_initialized_with_type_initializer.snap |  11 +
 ...tial_constant_values_in_pou_variables.snap |  11 +
 ..._initial_values_in_function_block_pou.snap |  21 +
 ...lizers__initial_values_in_program_pou.snap |  11 +
 ..._for_struct_initialization_in_program.snap |  11 +
 ...izers__array_of_struct_initialization.snap |  11 +
 ...lizers__initial_values_in_fb_variable.snap |  24 ++
 ...array_of_structs_are_zero_initialized.snap |  11 +
 src/codegen/tests/online_change_tests.rs      |  42 +-
 src/codegen/tests/oop_tests.rs                | 136 +++++-
 src/codegen/tests/oop_tests/debug_tests.rs    | 171 +++++++-
 src/codegen/tests/parameters_tests.rs         |  38 +-
 ...enerates_in_separate_global_variables.snap |  11 +
 ...sts__accessing_nested_array_in_struct.snap |  11 +
 ...e_gen_tests__accessing_nested_structs.snap |  11 +
 ...e_gen_tests__action_called_in_program.snap |  11 +
 ...sts__array_of_cast_int_type_generated.snap |  11 +
 ..._int_non_zero_negative_type_generated.snap |  11 +
 ..._array_of_int_non_zero_type_generated.snap |  11 +
 ...en_tests__array_of_int_type_generated.snap |  11 +
 ...ode_gen_tests__array_of_int_type_used.snap |  11 +
 ...ype_with_non_zero_negative_start_used.snap |  11 +
 ..._of_int_type_with_non_zero_start_used.snap |  11 +
 ...d_variable_declaration_is_initialized.snap |  11 +
 ...mber_of_another_struct_is_initialized.snap |  11 +
 ...__case_with_multiple_labels_statement.snap |  11 +
 ...gen_tests__case_with_ranges_statement.snap |  11 +
 ...s__casted_literals_bool_code_gen_test.snap |  11 +
 ..._tests__casted_literals_code_gen_test.snap |  11 +
 ...ts__casted_literals_hex_code_gen_test.snap |  11 +
 ...asted_literals_hex_ints_code_gen_test.snap |  11 +
 ...__casted_literals_lreal_code_gen_test.snap |  11 +
 ...s__casted_literals_real_code_gen_test.snap |  11 +
 ...__code_gen_tests__class_method_in_pou.snap |  11 +
 ...sts__code_gen_tests__complex_pointers.snap |  11 +
 ...ion_in_function_blocks_are_propagated.snap |   8 +
 ...anged_type_declaration_are_propagated.snap |  11 +
 ..._contants_in_case_statements_resolved.snap |  11 +
 ..._and_time_global_constants_initialize.snap |  11 +
 ...sts__code_gen_tests__date_comparisons.snap |  11 +
 ..._gen_tests__different_case_references.snap |  11 +
 ...lobal_variable_list_generates_nothing.snap |  11 +
 ...ram_with_name_generates_void_function.snap |  11 +
 ...pty_statements_dont_generate_anything.snap |  11 +
 ...num_members_can_be_used_in_asignments.snap |  11 +
 ...ests__enums_custom_type_are_generated.snap |  11 +
 ...__external_function_called_in_program.snap |  11 +
 ...global_variable_generates_as_external.snap |  11 +
 ...ternal_program_global_var_is_external.snap |  16 +
 ...n_tests__fb_method_called_as_function.snap |   8 +
 ...sts__code_gen_tests__fb_method_in_pou.snap |  21 +
 ..._gen_tests__fb_method_with_var_in_out.snap |  21 +
 ...ts__fb_method_with_var_input_defaults.snap |  21 +
 ...ode_gen_tests__for_statement_continue.snap |  11 +
 ...ts__code_gen_tests__for_statement_int.snap |  11 +
 ...s__code_gen_tests__for_statement_lint.snap |  11 +
 ...s__code_gen_tests__for_statement_sint.snap |  11 +
 ...en_tests__for_statement_with_continue.snap |  11 +
 ...de_gen_tests__for_statement_with_exit.snap |  11 +
 ..._statement_with_references_steps_test.snap |  11 +
 ..._tests__for_statement_with_steps_test.snap |  11 +
 ...sts__for_statement_without_steps_test.snap |  11 +
 ...n_tests__function_block_instance_call.snap |  21 +
 ...unction_block_qualified_instance_call.snap |  31 ++
 ...on_call_with_same_name_as_return_type.snap |  11 +
 ...gen_tests__function_called_in_program.snap |  11 +
 ..._tests__function_called_when_shadowed.snap |  11 +
 ...on_with_local_temp_var_initialization.snap |  11 +
 ...ith_local_var_initialization_and_call.snap |  11 +
 ...ion_with_parameters_called_in_program.snap |  11 +
 ...with_two_parameters_called_in_program.snap |  11 +
 ...lobal_variable_reference_is_generated.snap |  11 +
 ...n_tests__if_elsif_else_generator_test.snap |  11 +
 ...ts__code_gen_tests__if_generator_test.snap |  11 +
 ...ts__if_with_expression_generator_test.snap |  11 +
 ...rray_size_from_local_scoped_constants.snap |  11 +
 ...method_codegen_with_initialized_input.snap |   8 +
 ...s__method_codegen_with_multiple_input.snap |   8 +
 ...ts__method_with_aggregate_return_type.snap |   8 +
 ...s__code_gen_tests__methods_var_output.snap |  11 +
 ...do_not_result_in_an_under_or_overflow.snap |  11 +
 ...code_gen_tests__multidim_array_access.snap |  11 +
 ...gen_tests__multidim_array_declaration.snap |  11 +
 ...__code_gen_tests__nested_array_access.snap |  11 +
 ...e_gen_tests__nested_array_cube_writes.snap |  11 +
 ...sted_array_cube_writes_negative_start.snap |  11 +
 ...e_gen_tests__nested_array_declaration.snap |  11 +
 ...ts__nested_function_called_in_program.snap |  11 +
 ...n_tests__order_var_and_var_temp_block.snap |  11 +
 ...__code_gen_tests__pass_inout_to_inout.snap |  31 ++
 ...s__code_gen_tests__pointers_generated.snap |  11 +
 ..._gen_tests__program_called_in_program.snap |  21 +
 ...gen_tests__program_with_and_statement.snap |  11 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ..._program_with_casted_chars_assignment.snap |  11 +
 ...s__code_gen_tests__program_with_chars.snap |  11 +
 ...n_tests__program_with_date_assignment.snap |  11 +
 ..._assignment_whit_short_datatype_names.snap |  11 +
 ...arison_assignment_generates_correctly.snap |  11 +
 ...am_with_local_temp_var_initialization.snap |  21 +
 ...ts__program_with_long_date_assignment.snap |  11 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ..._gen_tests__program_with_or_statement.snap |  11 +
 ...en_tests__program_with_real_additions.snap |  11 +
 ...n_tests__program_with_real_assignment.snap |  11 +
 ...ts__program_with_real_cast_assignment.snap |  11 +
 ...gram_with_signed_combined_expressions.snap |  11 +
 ..._program_with_special_chars_in_string.snap |  11 +
 ...tests__program_with_string_assignment.snap |  11 +
 ...n_tests__program_with_time_assignment.snap |  11 +
 ...__program_with_time_of_day_assignment.snap |  11 +
 ...explicit_parameters_called_in_program.snap |  21 +
 ...with_two_parameters_called_in_program.snap |  21 +
 ...gram_with_var_inout_called_in_program.snap |  21 +
 ...rogram_with_var_out_called_in_program.snap |  21 +
 ..._with_var_out_called_mixed_in_program.snap |  21 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ...tes_void_function_and_struct_and_body.snap |  11 +
 ...es_generates_void_function_and_struct.snap |  11 +
 ...gen_tests__program_with_xor_statement.snap |  11 +
 ...fied_action_from_fb_called_in_program.snap |  21 +
 ...fied_foreign_action_called_in_program.snap |  21 +
 ...lified_local_action_called_in_program.snap |  11 +
 ...ests__real_function_called_in_program.snap |  11 +
 ...e_gen_tests__reference_qualified_name.snap |  31 ++
 ...nce_assignments_in_function_arguments.snap |  21 +
 ...sts__code_gen_tests__repeat_statement.snap |  11 +
 ...ts__returning_early_in_function_block.snap |   8 +
 ...e_gen_tests__simple_case_i8_statement.snap |  11 +
 ...code_gen_tests__simple_case_statement.snap |  11 +
 ...ts__structs_members_can_be_referenced.snap |  11 +
 ..._gen_tests__sub_range_check_functions.snap |  11 +
 ...nge_type_calls_check_function_missing.snap |  11 +
 ...ype_calls_check_function_on_assigment.snap |  11 +
 ...ariables_have_nano_seconds_resolution.snap |  11 +
 ...enerates_in_separate_global_variables.snap |  11 +
 ..._tests__typed_enums_are_used_properly.snap |  11 +
 ...ng_cast_statement_as_const_expression.snap |  11 +
 ..._using_const_expression_in_range_type.snap |  11 +
 ...s__using_global_consts_in_expressions.snap |  11 +
 ..._variable_with_same_name_as_data_type.snap |  11 +
 ...de_gen_tests__while_loop_with_if_exit.snap |  11 +
 ...ests__code_gen_tests__while_statement.snap |  11 +
 ...ests__while_with_expression_statement.snap |  11 +
 ...uctions_tests__compare_datetime_types.snap |  11 +
 ...uction_functions_with_different_types.snap |  11 +
 ...are_instructions_with_different_types.snap |  11 +
 ...s_tests__pointer_compare_instructions.snap |  11 +
 ...er_function_call_compare_instructions.snap |  11 +
 ...tests__assigning_const_array_variable.snap |  11 +
 ...ests__assigning_const_string_variable.snap |  11 +
 ...ests__assigning_const_struct_variable.snap |  11 +
 ...n_tests__access_string_via_byte_array.snap |  11 +
 ...ssion_tests__allowed_assignable_types.snap |  11 +
 ...sion_tests__builtin_function_call_adr.snap |  11 +
 ...ts__builtin_function_call_lower_bound.snap |  11 +
 ...ion_tests__builtin_function_call_move.snap |  11 +
 ...sion_tests__builtin_function_call_mux.snap |  11 +
 ...function_call_mux_with_aggregate_type.snap |  11 +
 ...sion_tests__builtin_function_call_ref.snap |  11 +
 ...sion_tests__builtin_function_call_sel.snap |  11 +
 ...iltin_function_call_sel_as_expression.snap |  11 +
 ...n_tests__builtin_function_call_sizeof.snap |  11 +
 ...ts__builtin_function_call_upper_bound.snap |  11 +
 ...uiltin_function_call_upper_bound_expr.snap |  11 +
 ...s__calling_strings_in_function_return.snap |  11 +
 ...ion_tests__cast_between_pointer_types.snap |  11 +
 ...ion_tests__compare_date_time_literals.snap |  11 +
 ...ression_tests__nested_call_statements.snap |  11 +
 ...expression_tests__pointer_arithmetics.snap |  11 +
 ...ts__pointer_arithmetics_function_call.snap |  11 +
 ..._tests__unary_expressions_can_be_real.snap |  11 +
 ...necessary_casts_between_pointer_types.snap |  11 +
 ...t_argument_literals_for_function_call.snap |  11 +
 ...argument_references_for_function_call.snap |  11 +
 ...ized_string_varargs_called_in_program.snap |  11 +
 ..._with_sized_varargs_called_in_program.snap |  11 +
 ...nction_with_varargs_called_in_program.snap |  11 +
 ...literal_string_argument_passed_by_ref.snap |  11 +
 ...tests__passing_a_string_to_a_function.snap |  11 +
 ...g_a_string_to_a_function_as_reference.snap |  11 +
 ...arguments_to_functions_by_ref_and_val.snap |  11 +
 ...n__tests__function_tests__simple_call.snap |  11 +
 ...on_tests__var_output_in_function_call.snap |  11 +
 ...t__any_real_function_called_with_ints.snap |  11 +
 ...unction_call_generates_real_type_call.snap |  11 +
 ...nerics_test__generic_output_parameter.snap |  11 +
 ...ccepts_empty_statement_as_input_param.snap |  21 +
 ...cepts_empty_statement_as_output_param.snap |  21 +
 ...ccepts_empty_statement_as_input_param.snap |  11 +
 ...cepts_empty_statement_as_output_param.snap |  11 +
 ...sts__function_all_parameters_assigned.snap |  11 +
 ...function_default_value_parameter_type.snap |  11 +
 ...ests__function_empty_inout_assignment.snap |  11 +
 ...ests__function_empty_input_assignment.snap |  11 +
 ...sts__function_empty_output_assignment.snap |  11 +
 ...empty_output_default_value_assignment.snap |  11 +
 ...ts__function_missing_inout_assignment.snap |  11 +
 ...ts__function_missing_input_assignment.snap |  11 +
 ...issing_input_default_value_assignment.snap |  11 +
 ...s__function_missing_output_assignment.snap |  11 +
 ...ssing_output_default_value_assignment.snap |  11 +
 ...unction_block_pointer_are_assigned_to.snap |  21 +
 ...ccepts_empty_statement_as_input_param.snap |  21 +
 ...cepts_empty_statement_as_output_param.snap |  21 +
 ...gram_all_parameters_assigned_explicit.snap |  21 +
 ...gram_all_parameters_assigned_implicit.snap |  21 +
 ...tests__program_empty_inout_assignment.snap |  21 +
 ...sts__program_missing_input_assignment.snap |  21 +
 ...ts__program_missing_output_assignment.snap |  21 +
 ...var_in_out_params_can_be_out_of_order.snap |  21 +
 ...taccess_generated_as_rsh_and_trunc_i1.snap |  11 +
 ...eaccess_generated_as_rsh_and_trunc_i8.snap |  11 +
 ...access_generated_as_rsh_and_trunc_i32.snap |  11 +
 ...t_codegen_test__nested_bitwise_access.snap |  11 +
 ...n_test__variable_based_bitwise_access.snap |  11 +
 ...access_generated_as_rsh_and_trunc_i16.snap |  11 +
 ..._casted_string_assignment_uses_memcpy.snap |  11 +
 ...g_generic_string_should_return_by_ref.snap |  11 +
 ...ts__function_returns_a_literal_string.snap |  11 +
 ...es_string_paramter_and_returns_string.snap |  11 +
 ...__string_tests__program_string_output.snap |  21 +
 ...program_with_casted_string_assignment.snap |  11 +
 ...__program_with_string_type_assignment.snap |  11 +
 ...ing_tests__string_function_parameters.snap |  11 +
 ...ariable_length_strings_can_be_created.snap |  11 +
 ...trings_using_constants_can_be_created.snap |  11 +
 ...ests__variable_string_assignment_test.snap |  11 +
 ...string_tests__vartmp_string_init_test.snap |  11 +
 ...ed_datatypes_respect_conversion_rules.snap |  11 +
 ...r_than_int_promote_the_second_operand.snap |  11 +
 ...es_smaller_than_dint_promoted_to_dint.snap |  11 +
 ...all_sint_expressions_fallback_to_dint.snap |  11 +
 ...at_and_double_mix_converted_to_double.snap |  11 +
 ...m_test__float_assigned_to_int_is_cast.snap |  11 +
 ...t__float_assinged_to_double_to_double.snap |  11 +
 ...m_test__int_assigned_to_float_is_cast.snap |  11 +
 ...an_byte_promoted_on_compare_statement.snap |  11 +
 ...bigger_than_float_converted_to_double.snap |  11 +
 ..._or_equal_to_float_converted_to_float.snap |  11 +
 ...ariadic_functions_without_declaration.snap |  11 +
 ...es_smaller_than_dint_promoted_to_dint.snap |  11 +
 src/lowering.rs                               |  44 +-
 src/lowering/initializers.rs                  | 138 ++++++-
 .../tests/resolve_and_lower_init_functions.rs |  28 +-
 src/tests/adr/arrays_adr.rs                   |  20 +
 src/tests/adr/enum_adr.rs                     |  14 +-
 src/tests/adr/initializer_functions_adr.rs    |  75 +++-
 src/tests/adr/pou_adr.rs                      | 119 +++++-
 src/tests/adr/strings_adr.rs                  |  28 +-
 src/tests/adr/structs_adr.rs                  |  42 +-
 ...__integration__cfc__ir__actions_debug.snap |   9 +
 ...egration__cfc__ir__conditional_return.snap |   8 +
 ...r__conditional_return_evaluating_true.snap |   8 +
 ...tional_return_evaluating_true_negated.snap |   8 +
 ...sts__integration__cfc__ir__jump_debug.snap |   9 +
 ...tegration__cfc__ir__sink_source_debug.snap |   9 +
 281 files changed, 4637 insertions(+), 113 deletions(-)

diff --git a/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_files_in_different_locations_with_debug_info.snap b/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_files_in_different_locations_with_debug_info.snap
index 002a509454..869c5fe769 100644
--- a/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_files_in_different_locations_with_debug_info.snap
+++ b/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_files_in_different_locations_with_debug_info.snap
@@ -1,6 +1,7 @@
 ---
 source: compiler/plc_driver/./src/tests/multi_files.rs
 expression: "results.join(\"\\n\")"
+snapshot_kind: text
 ---
 ; ModuleID = 'app/file1.st'
 source_filename = "app/file1.st"
@@ -105,6 +106,13 @@ entry:
 
 declare void @mainProg(%mainProg*)
 
+define void @__user_init_mainProg(%mainProg* %0) {
+entry:
+  %self = alloca %mainProg*, align 8
+  store %mainProg* %0, %mainProg** %self, align 8
+  ret void
+}
+
 ; ModuleID = '__init___TestProject'
 source_filename = "__init___TestProject"
 
@@ -116,9 +124,12 @@ source_filename = "__init___TestProject"
 define void @__init___TestProject() {
 entry:
   call void @__init_mainprog(%mainProg* @mainProg_instance)
+  call void @__user_init_mainProg(%mainProg* @mainProg_instance)
   ret void
 }
 
 declare void @__init_mainprog(%mainProg*)
 
 declare void @mainProg(%mainProg*)
+
+declare void @__user_init_mainProg(%mainProg*)
diff --git a/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_files_with_debug_info.snap b/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_files_with_debug_info.snap
index ba91c211f7..7fb53f01be 100644
--- a/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_files_with_debug_info.snap
+++ b/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_files_with_debug_info.snap
@@ -1,6 +1,7 @@
 ---
 source: compiler/plc_driver/./src/tests/multi_files.rs
 expression: "results.join(\"\\n\")"
+snapshot_kind: text
 ---
 ; ModuleID = 'file1.st'
 source_filename = "file1.st"
@@ -105,6 +106,13 @@ entry:
 
 declare void @mainProg(%mainProg*)
 
+define void @__user_init_mainProg(%mainProg* %0) {
+entry:
+  %self = alloca %mainProg*, align 8
+  store %mainProg* %0, %mainProg** %self, align 8
+  ret void
+}
+
 ; ModuleID = '__init___TestProject'
 source_filename = "__init___TestProject"
 
@@ -116,9 +124,12 @@ source_filename = "__init___TestProject"
 define void @__init___TestProject() {
 entry:
   call void @__init_mainprog(%mainProg* @mainProg_instance)
+  call void @__user_init_mainProg(%mainProg* @mainProg_instance)
   ret void
 }
 
 declare void @__init_mainprog(%mainProg*)
 
 declare void @mainProg(%mainProg*)
+
+declare void @__user_init_mainProg(%mainProg*)
diff --git a/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_source_files_generated.snap b/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_source_files_generated.snap
index aca0e9ee64..ec0b04ae0a 100644
--- a/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_source_files_generated.snap
+++ b/compiler/plc_driver/src/tests/snapshots/plc_driver__tests__multi_files__multiple_source_files_generated.snap
@@ -1,6 +1,7 @@
 ---
 source: compiler/plc_driver/./src/tests/multi_files.rs
 expression: "results.join(\"\\n\")"
+snapshot_kind: text
 ---
 ; ModuleID = 'external_file1.st'
 source_filename = "external_file1.st"
@@ -48,6 +49,13 @@ entry:
 
 declare void @mainProg(%mainProg*)
 
+define void @__user_init_mainProg(%mainProg* %0) {
+entry:
+  %self = alloca %mainProg*, align 8
+  store %mainProg* %0, %mainProg** %self, align 8
+  ret void
+}
+
 ; ModuleID = '__init___TestProject'
 source_filename = "__init___TestProject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___TestProject"
 define void @__init___TestProject() {
 entry:
   call void @__init_mainprog(%mainProg* @mainProg_instance)
+  call void @__user_init_mainProg(%mainProg* @mainProg_instance)
   ret void
 }
 
 declare void @__init_mainprog(%mainProg*)
 
 declare void @mainProg(%mainProg*)
+
+declare void @__user_init_mainProg(%mainProg*)
diff --git a/compiler/plc_lowering/src/inheritance.rs b/compiler/plc_lowering/src/inheritance.rs
index 424c071575..1821cc875e 100644
--- a/compiler/plc_lowering/src/inheritance.rs
+++ b/compiler/plc_lowering/src/inheritance.rs
@@ -1792,7 +1792,7 @@ mod units_tests {
 
         let (_, project) = parse_and_annotate("test", vec![src]).unwrap();
         let unit = &project.units[0].get_unit().implementations[3];
-        assert_debug_snapshot!(unit, @r###"
+        assert_debug_snapshot!(unit, @r#"
         Implementation {
             name: "main",
             type_name: "main",
@@ -1819,6 +1819,26 @@ mod units_tests {
                         },
                     ),
                 },
+                CallStatement {
+                    operator: ReferenceExpr {
+                        kind: Member(
+                            Identifier {
+                                name: "__user_init_child",
+                            },
+                        ),
+                        base: None,
+                    },
+                    parameters: Some(
+                        ReferenceExpr {
+                            kind: Member(
+                                Identifier {
+                                    name: "fb",
+                                },
+                            ),
+                            base: None,
+                        },
+                    ),
+                },
                 Assignment {
                     left: ReferenceExpr {
                         kind: Deref,
@@ -1980,7 +2000,7 @@ mod units_tests {
             generic: false,
             access: None,
         }
-        "###)
+        "#)
     }
 
     #[test]
diff --git a/src/codegen/tests/address_tests.rs b/src/codegen/tests/address_tests.rs
index 13ce8f84ac..214a293589 100644
--- a/src/codegen/tests/address_tests.rs
+++ b/src/codegen/tests/address_tests.rs
@@ -118,6 +118,13 @@ fn address_variable_used_with_symbolic_name() {
     }
 
     declare void @mainProg(%mainProg*)
+
+    define void @__user_init_mainProg(%mainProg* %0) {
+    entry:
+      %self = alloca %mainProg*, align 8
+      store %mainProg* %0, %mainProg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -134,12 +141,15 @@ fn address_variable_used_with_symbolic_name() {
       store i8* @__PI_1_2_3_4, i8** @foo, align 8
       store i8* @__PI_1_2_3_4, i8** @baz, align 8
       call void @__init_mainprog(%mainProg* @mainProg_instance)
+      call void @__user_init_mainProg(%mainProg* @mainProg_instance)
       ret void
     }
 
     declare void @__init_mainprog(%mainProg*)
 
     declare void @mainProg(%mainProg*)
+
+    declare void @__user_init_mainProg(%mainProg*)
     "#);
 }
 
@@ -195,6 +205,13 @@ fn address_used_in_body() {
     }
 
     declare void @mainProg(%mainProg*)
+
+    define void @__user_init_mainProg(%mainProg* %0) {
+    entry:
+      %self = alloca %mainProg*, align 8
+      store %mainProg* %0, %mainProg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -212,11 +229,14 @@ fn address_used_in_body() {
       store i8* @__PI_1_2_3_4, i8** @foo, align 8
       store i8* @__PI_1_2_3_5, i8** @baz, align 8
       call void @__init_mainprog(%mainProg* @mainProg_instance)
+      call void @__user_init_mainProg(%mainProg* @mainProg_instance)
       ret void
     }
 
     declare void @__init_mainprog(%mainProg*)
 
     declare void @mainProg(%mainProg*)
+
+    declare void @__user_init_mainProg(%mainProg*)
     "#);
 }
diff --git a/src/codegen/tests/code_gen_tests.rs b/src/codegen/tests/code_gen_tests.rs
index 19d32096cd..ebaeb24686 100644
--- a/src/codegen/tests/code_gen_tests.rs
+++ b/src/codegen/tests/code_gen_tests.rs
@@ -1145,6 +1145,7 @@ fn fb_method_called_locally() {
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 bitcast (%foo* @__foo__init to i8*), i64 ptrtoint (%foo* getelementptr (%foo, %foo* null, i32 1) to i64), i1 false)
       store i32 0, i32* %x, align 4
       call void @__init_foo(%foo* %fb)
+      call void @__user_init_foo(%foo* %fb)
       %call = call i32 @foo.addToBar(%foo* %fb, i16 3)
       store i32 %call, i32* %x, align 4
       ret void
@@ -1152,6 +1153,8 @@ fn fb_method_called_locally() {
 
     declare void @__init_foo(%foo*)
 
+    declare void @__user_init_foo(%foo*)
+
     ; Function Attrs: argmemonly nofree nounwind willreturn
     declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
 
@@ -1171,6 +1174,13 @@ fn fb_method_called_locally() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1257,6 +1267,7 @@ fn fb_local_method_var_shadows_parent_var() {
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 bitcast (%foo* @__foo__init to i8*), i64 ptrtoint (%foo* getelementptr (%foo, %foo* null, i32 1) to i64), i1 false)
       store i32 0, i32* %x, align 4
       call void @__init_foo(%foo* %fb)
+      call void @__user_init_foo(%foo* %fb)
       %call = call i32 @foo.addToBar(%foo* %fb, i16 3)
       store i32 %call, i32* %x, align 4
       ret void
@@ -1264,6 +1275,8 @@ fn fb_local_method_var_shadows_parent_var() {
 
     declare void @__init_foo(%foo*)
 
+    declare void @__user_init_foo(%foo*)
+
     ; Function Attrs: argmemonly nofree nounwind willreturn
     declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
 
@@ -1283,6 +1296,13 @@ fn fb_local_method_var_shadows_parent_var() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1379,6 +1399,13 @@ fn prog_method_called_locally() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1390,12 +1417,15 @@ fn prog_method_called_locally() {
     define void @__init___testproject() {
     entry:
       call void @__init_foo(%foo* @foo_instance)
+      call void @__user_init_foo(%foo* @foo_instance)
       ret void
     }
 
     declare void @__init_foo(%foo*)
 
     declare void @foo(%foo*)
+
+    declare void @__user_init_foo(%foo*)
     "#)
 }
 
@@ -1487,6 +1517,13 @@ fn prog_local_method_var_shadows_parent_var() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1498,12 +1535,15 @@ fn prog_local_method_var_shadows_parent_var() {
     define void @__init___testproject() {
     entry:
       call void @__init_foo(%foo* @foo_instance)
+      call void @__user_init_foo(%foo* @foo_instance)
       ret void
     }
 
     declare void @__init_foo(%foo*)
 
     declare void @foo(%foo*)
+
+    declare void @__user_init_foo(%foo*)
     "#)
 }
 
@@ -1780,6 +1820,13 @@ fn for_statement_with_binary_expressions() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1791,12 +1838,15 @@ fn for_statement_with_binary_expressions() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
+
+    declare void @__user_init_prg(%prg*)
     "#);
 }
 
@@ -4177,6 +4227,20 @@ fn variables_in_var_external_block_are_not_generated() {
     }
 
     declare void @qux(%qux*)
+
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_baz(%baz* %0) {
+    entry:
+      %self = alloca %baz*, align 8
+      store %baz* %0, %baz** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -4188,12 +4252,15 @@ fn variables_in_var_external_block_are_not_generated() {
     define void @__init___testproject() {
     entry:
       call void @__init_baz(%baz* @baz_instance)
+      call void @__user_init_baz(%baz* @baz_instance)
       ret void
     }
 
     declare void @__init_baz(%baz*)
 
     declare void @baz(%baz*)
+
+    declare void @__user_init_baz(%baz*)
     "#);
 }
 
diff --git a/src/codegen/tests/debug_tests.rs b/src/codegen/tests/debug_tests.rs
index 0fa333924d..97d2fc701e 100644
--- a/src/codegen/tests/debug_tests.rs
+++ b/src/codegen/tests/debug_tests.rs
@@ -349,7 +349,7 @@ fn dbg_declare_has_valid_metadata_references_for_methods() {
         ",
     );
 
-    assert_snapshot!(codegen, @r###"
+    assert_snapshot!(codegen, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -380,6 +380,13 @@ fn dbg_declare_has_valid_metadata_references_for_methods() {
       ret void
     }
 
+    define void @__user_init_fb(%fb* %0) {
+    entry:
+      %self = alloca %fb*, align 8
+      store %fb* %0, %fb** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -407,7 +414,7 @@ fn dbg_declare_has_valid_metadata_references_for_methods() {
     !14 = distinct !DISubprogram(name: "fb.foo", linkageName: "fb.foo", scope: !9, file: !2, line: 3, type: !10, scopeLine: 4, flags: DIFlagPublic, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !4)
     !15 = !DILocalVariable(name: "fb", scope: !14, file: !2, line: 4, type: !3)
     !16 = !DILocation(line: 4, column: 8, scope: !14)
-    "###);
+    "#);
 }
 
 #[test]
@@ -487,9 +494,17 @@ fn action_with_var_temp() {
       ret void
     }
 
+    define void @__user_init_PLC_PRG(%PLC_PRG* %0) {
+    entry:
+      %self = alloca %PLC_PRG*, align 8
+      store %PLC_PRG* %0, %PLC_PRG** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       call void @__init_plc_prg(%PLC_PRG* @PLC_PRG_instance)
+      call void @__user_init_PLC_PRG(%PLC_PRG* @PLC_PRG_instance)
       ret void
     }
 
diff --git a/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__external_impl_is_not_added_as_external_subroutine.snap b/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__external_impl_is_not_added_as_external_subroutine.snap
index 53a2ca6cf3..e8c21bbfb2 100644
--- a/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__external_impl_is_not_added_as_external_subroutine.snap
+++ b/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__external_impl_is_not_added_as_external_subroutine.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/debug_tests/expression_debugging.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,3 +34,29 @@ declare void @myFb(%myFb*)
 !10 = distinct !DICompileUnit(language: DW_LANG_C, file: !11, producer: "RuSTy Structured text Compiler", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, globals: !12, splitDebugInlining: false)
 !11 = !DIFile(filename: "<internal>", directory: "src")
 !12 = !{!0, !5}
+; ModuleID = '__initializers'
+source_filename = "__initializers"
+
+%myFb = type {}
+%myPrg = type {}
+
+@__myFb__init = external global %myFb
+@myPrg_instance = external global %myPrg
+
+define void @__user_init_myFb(%myFb* %0) {
+entry:
+  %self = alloca %myFb*, align 8
+  store %myFb* %0, %myFb** %self, align 8
+  ret void
+}
+
+declare void @myFb(%myFb*)
+
+define void @__user_init_myPrg(%myPrg* %0) {
+entry:
+  %self = alloca %myPrg*, align 8
+  store %myPrg* %0, %myPrg** %self, align 8
+  ret void
+}
+
+declare void @myPrg(%myPrg*)
diff --git a/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__implementation_added_as_subroutine.snap b/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__implementation_added_as_subroutine.snap
index fcd3a5885d..7d62adfa4c 100644
--- a/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__implementation_added_as_subroutine.snap
+++ b/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__implementation_added_as_subroutine.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/debug_tests/expression_debugging.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -96,6 +97,20 @@ entry:
 }
 
 declare void @myFb(%myFb*)
+
+define void @__user_init_myFb(%myFb* %0) {
+entry:
+  %self = alloca %myFb*, align 8
+  store %myFb* %0, %myFb** %self, align 8
+  ret void
+}
+
+define void @__user_init_myPrg(%myPrg* %0) {
+entry:
+  %self = alloca %myPrg*, align 8
+  store %myPrg* %0, %myPrg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -107,9 +122,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_myprg(%myPrg* @myPrg_instance)
+  call void @__user_init_myPrg(%myPrg* @myPrg_instance)
   ret void
 }
 
 declare void @__init_myprg(%myPrg*)
 
 declare void @myPrg(%myPrg*)
+
+declare void @__user_init_myPrg(%myPrg*)
diff --git a/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__non_function_pous_have_struct_as_param.snap b/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__non_function_pous_have_struct_as_param.snap
index c6a3c58345..07dee4a1b2 100644
--- a/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__non_function_pous_have_struct_as_param.snap
+++ b/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__non_function_pous_have_struct_as_param.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/debug_tests/expression_debugging.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -95,6 +96,20 @@ entry:
 }
 
 declare void @fb(%fb*)
+
+define void @__user_init_fb(%fb* %0) {
+entry:
+  %self = alloca %fb*, align 8
+  store %fb* %0, %fb** %self, align 8
+  ret void
+}
+
+define void @__user_init_myProg(%myProg* %0) {
+entry:
+  %self = alloca %myProg*, align 8
+  store %myProg* %0, %myProg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -106,9 +121,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_myprog(%myProg* @myProg_instance)
+  call void @__user_init_myProg(%myProg* @myProg_instance)
   ret void
 }
 
 declare void @__init_myprog(%myProg*)
 
 declare void @myProg(%myProg*)
+
+declare void @__user_init_myProg(%myProg*)
diff --git a/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__var_and_vartemp_variables_in_pous_added_as_local.snap b/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__var_and_vartemp_variables_in_pous_added_as_local.snap
index 81aaf49763..c597898d84 100644
--- a/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__var_and_vartemp_variables_in_pous_added_as_local.snap
+++ b/src/codegen/tests/debug_tests/snapshots/rusty__codegen__tests__debug_tests__expression_debugging__var_and_vartemp_variables_in_pous_added_as_local.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/debug_tests/expression_debugging.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -141,6 +142,20 @@ entry:
 }
 
 declare void @myFb(%myFb*)
+
+define void @__user_init_myFb(%myFb* %0) {
+entry:
+  %self = alloca %myFb*, align 8
+  store %myFb* %0, %myFb** %self, align 8
+  ret void
+}
+
+define void @__user_init_myPrg(%myPrg* %0) {
+entry:
+  %self = alloca %myPrg*, align 8
+  store %myPrg* %0, %myPrg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -152,9 +167,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_myprg(%myPrg* @myPrg_instance)
+  call void @__user_init_myPrg(%myPrg* @myPrg_instance)
   ret void
 }
 
 declare void @__init_myprg(%myPrg*)
 
 declare void @myPrg(%myPrg*)
+
+declare void @__user_init_myPrg(%myPrg*)
diff --git a/src/codegen/tests/directaccess_test.rs b/src/codegen/tests/directaccess_test.rs
index 7e0bfb1bfa..9d8da8060f 100644
--- a/src/codegen/tests/directaccess_test.rs
+++ b/src/codegen/tests/directaccess_test.rs
@@ -141,7 +141,7 @@ fn direct_acess_in_output_assignment_implicit_explicit_and_mixed() {
         ",
     );
 
-    assert_snapshot!(ir, @r###"
+    assert_snapshot!(ir, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -166,6 +166,7 @@ fn direct_acess_in_output_assignment_implicit_explicit_and_mixed() {
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 getelementptr inbounds (%FOO, %FOO* @__FOO__init, i32 0, i32 0), i64 ptrtoint (%FOO* getelementptr (%FOO, %FOO* null, i32 1) to i64), i1 false)
       store i32 0, i32* %main, align 4
       call void @__init_foo(%FOO* %f)
+      call void @__user_init_FOO(%FOO* %f)
       %1 = getelementptr inbounds %FOO, %FOO* %f, i32 0, i32 0
       %load_error_bits = load i8, i8* %error_bits, align 1
       %shift = lshr i8 %load_error_bits, 0
@@ -217,6 +218,8 @@ fn direct_acess_in_output_assignment_implicit_explicit_and_mixed() {
 
     declare void @__init_foo(%FOO*)
 
+    declare void @__user_init_FOO(%FOO*)
+
     ; Function Attrs: argmemonly nofree nounwind willreturn
     declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
 
@@ -236,6 +239,13 @@ fn direct_acess_in_output_assignment_implicit_explicit_and_mixed() {
     }
 
     declare void @FOO(%FOO*)
+
+    define void @__user_init_FOO(%FOO* %0) {
+    entry:
+      %self = alloca %FOO*, align 8
+      store %FOO* %0, %FOO** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -245,7 +255,7 @@ fn direct_acess_in_output_assignment_implicit_explicit_and_mixed() {
     entry:
       ret void
     }
-    "###);
+    "#);
 }
 
 #[test]
@@ -269,7 +279,7 @@ fn direct_acess_in_output_assignment_with_simple_expression() {
         ",
     );
 
-    assert_snapshot!(ir, @r###"
+    assert_snapshot!(ir, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -293,6 +303,7 @@ fn direct_acess_in_output_assignment_with_simple_expression() {
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 getelementptr inbounds (%FOO, %FOO* @__FOO__init, i32 0, i32 0), i64 ptrtoint (%FOO* getelementptr (%FOO, %FOO* null, i32 1) to i64), i1 false)
       store i32 0, i32* %main, align 4
       call void @__init_foo(%FOO* %f)
+      call void @__user_init_FOO(%FOO* %f)
       call void @FOO(%FOO* %f)
       %1 = getelementptr inbounds %FOO, %FOO* %f, i32 0, i32 0
       %2 = load i8, i8* %error_bits, align 1
@@ -307,6 +318,8 @@ fn direct_acess_in_output_assignment_with_simple_expression() {
 
     declare void @__init_foo(%FOO*)
 
+    declare void @__user_init_FOO(%FOO*)
+
     ; Function Attrs: argmemonly nofree nounwind willreturn
     declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
 
@@ -326,6 +339,13 @@ fn direct_acess_in_output_assignment_with_simple_expression() {
     }
 
     declare void @FOO(%FOO*)
+
+    define void @__user_init_FOO(%FOO* %0) {
+    entry:
+      %self = alloca %FOO*, align 8
+      store %FOO* %0, %FOO** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -335,7 +355,7 @@ fn direct_acess_in_output_assignment_with_simple_expression() {
     entry:
       ret void
     }
-    "###);
+    "#);
 }
 
 #[test]
@@ -359,7 +379,7 @@ fn direct_acess_in_output_assignment_with_simple_expression_implicit() {
         ",
     );
 
-    assert_snapshot!(ir, @r###"
+    assert_snapshot!(ir, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -383,6 +403,7 @@ fn direct_acess_in_output_assignment_with_simple_expression_implicit() {
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 getelementptr inbounds (%FOO, %FOO* @__FOO__init, i32 0, i32 0), i64 ptrtoint (%FOO* getelementptr (%FOO, %FOO* null, i32 1) to i64), i1 false)
       store i32 0, i32* %main, align 4
       call void @__init_foo(%FOO* %f)
+      call void @__user_init_FOO(%FOO* %f)
       call void @FOO(%FOO* %f)
       %1 = getelementptr inbounds %FOO, %FOO* %f, i32 0, i32 0
       %2 = load i8, i8* %error_bits, align 1
@@ -397,6 +418,8 @@ fn direct_acess_in_output_assignment_with_simple_expression_implicit() {
 
     declare void @__init_foo(%FOO*)
 
+    declare void @__user_init_FOO(%FOO*)
+
     ; Function Attrs: argmemonly nofree nounwind willreturn
     declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
 
@@ -416,6 +439,13 @@ fn direct_acess_in_output_assignment_with_simple_expression_implicit() {
     }
 
     declare void @FOO(%FOO*)
+
+    define void @__user_init_FOO(%FOO* %0) {
+    entry:
+      %self = alloca %FOO*, align 8
+      store %FOO* %0, %FOO** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -425,7 +455,7 @@ fn direct_acess_in_output_assignment_with_simple_expression_implicit() {
     entry:
       ret void
     }
-    "###);
+    "#);
 }
 
 #[test]
@@ -458,7 +488,7 @@ fn direct_acess_in_output_assignment_with_complexe_expression() {
         ",
     );
 
-    assert_snapshot!(ir, @r###"
+    assert_snapshot!(ir, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -488,6 +518,7 @@ fn direct_acess_in_output_assignment_with_complexe_expression() {
       store i32 0, i32* %main, align 4
       call void @__init_foo_struct(%foo_struct* %foo)
       call void @__init_quux(%QUUX* %f)
+      call void @__user_init_QUUX(%QUUX* %f)
       call void @QUUX(%QUUX* %f)
       %bar = getelementptr inbounds %foo_struct, %foo_struct* %foo, i32 0, i32 0
       %baz = getelementptr inbounds %bar_struct, %bar_struct* %bar, i32 0, i32 0
@@ -518,6 +549,8 @@ fn direct_acess_in_output_assignment_with_complexe_expression() {
 
     declare void @__init_quux(%QUUX*)
 
+    declare void @__user_init_QUUX(%QUUX*)
+
     ; Function Attrs: argmemonly nofree nounwind willreturn
     declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
 
@@ -558,6 +591,13 @@ fn direct_acess_in_output_assignment_with_complexe_expression() {
     }
 
     declare void @QUUX(%QUUX*)
+
+    define void @__user_init_QUUX(%QUUX* %0) {
+    entry:
+      %self = alloca %QUUX*, align 8
+      store %QUUX* %0, %QUUX** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -567,5 +607,5 @@ fn direct_acess_in_output_assignment_with_complexe_expression() {
     entry:
       ret void
     }
-    "###);
+    "#);
 }
diff --git a/src/codegen/tests/expression_tests.rs b/src/codegen/tests/expression_tests.rs
index cba25e5c99..0fa5e0638a 100644
--- a/src/codegen/tests/expression_tests.rs
+++ b/src/codegen/tests/expression_tests.rs
@@ -812,6 +812,13 @@ fn global_namespace_operator() {
     }
 
     declare void @main(%main*)
+
+    define void @__user_init_main(%main* %0) {
+    entry:
+      %self = alloca %main*, align 8
+      store %main* %0, %main** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -823,11 +830,14 @@ fn global_namespace_operator() {
     define void @__init___testproject() {
     entry:
       call void @__init_main(%main* @main_instance)
+      call void @__user_init_main(%main* @main_instance)
       ret void
     }
 
     declare void @__init_main(%main*)
 
     declare void @main(%main*)
+
+    declare void @__user_init_main(%main*)
     "#);
 }
diff --git a/src/codegen/tests/initialization_test/complex_initializers.rs b/src/codegen/tests/initialization_test/complex_initializers.rs
index b9b7d9f98e..205abba2da 100644
--- a/src/codegen/tests/initialization_test/complex_initializers.rs
+++ b/src/codegen/tests/initialization_test/complex_initializers.rs
@@ -147,6 +147,13 @@ fn init_functions_generated_for_programs() {
     }
 
     declare void @PLC_PRG(%PLC_PRG*)
+
+    define void @__user_init_PLC_PRG(%PLC_PRG* %0) {
+    entry:
+      %self = alloca %PLC_PRG*, align 8
+      store %PLC_PRG* %0, %PLC_PRG** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -158,12 +165,15 @@ fn init_functions_generated_for_programs() {
     define void @__init___testproject() {
     entry:
       call void @__init_plc_prg(%PLC_PRG* @PLC_PRG_instance)
+      call void @__user_init_PLC_PRG(%PLC_PRG* @PLC_PRG_instance)
       ret void
     }
 
     declare void @__init_plc_prg(%PLC_PRG*)
 
     declare void @PLC_PRG(%PLC_PRG*)
+
+    declare void @__user_init_PLC_PRG(%PLC_PRG*)
     "#);
 }
 
@@ -216,6 +226,13 @@ fn init_functions_work_with_adr() {
     }
 
     declare void @PLC_PRG(%PLC_PRG*)
+
+    define void @__user_init_PLC_PRG(%PLC_PRG* %0) {
+    entry:
+      %self = alloca %PLC_PRG*, align 8
+      store %PLC_PRG* %0, %PLC_PRG** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -227,12 +244,15 @@ fn init_functions_work_with_adr() {
     define void @__init___testproject() {
     entry:
       call void @__init_plc_prg(%PLC_PRG* @PLC_PRG_instance)
+      call void @__user_init_PLC_PRG(%PLC_PRG* @PLC_PRG_instance)
       ret void
     }
 
     declare void @__init_plc_prg(%PLC_PRG*)
 
     declare void @PLC_PRG(%PLC_PRG*)
+
+    declare void @__user_init_PLC_PRG(%PLC_PRG*)
     "#);
 }
 
@@ -285,6 +305,13 @@ fn init_functions_generated_for_function_blocks() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -515,6 +542,53 @@ fn nested_initializer_pous() {
     }
 
     declare void @sideProg(%sideProg*)
+
+    define void @__user_init_sideProg(%sideProg* %0) {
+    entry:
+      %self = alloca %sideProg*, align 8
+      store %sideProg* %0, %sideProg** %self, align 8
+      %deref = load %sideProg*, %sideProg** %self, align 8
+      %f = getelementptr inbounds %sideProg, %sideProg* %deref, i32 0, i32 1
+      call void @__user_init_foo(%foo* %f)
+      ret void
+    }
+
+    define void @__user_init_baz(%baz* %0) {
+    entry:
+      %self = alloca %baz*, align 8
+      store %baz* %0, %baz** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      %deref = load %bar*, %bar** %self, align 8
+      %b = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+      call void @__user_init_baz(%baz* %b)
+      ret void
+    }
+
+    define void @__user_init_mainProg(%mainProg* %0) {
+    entry:
+      %self = alloca %mainProg*, align 8
+      store %mainProg* %0, %mainProg** %self, align 8
+      %deref = load %mainProg*, %mainProg** %self, align 8
+      %f = getelementptr inbounds %mainProg, %mainProg* %deref, i32 0, i32 1
+      call void @__user_init_foo(%foo* %f)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      %deref = load %foo*, %foo** %self, align 8
+      %b = getelementptr inbounds %foo, %foo* %deref, i32 0, i32 1
+      call void @__user_init_bar(%bar* %b)
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -535,6 +609,8 @@ fn nested_initializer_pous() {
     entry:
       call void @__init_mainprog(%mainProg* @mainProg_instance)
       call void @__init_sideprog(%sideProg* @sideProg_instance)
+      call void @__user_init_mainProg(%mainProg* @mainProg_instance)
+      call void @__user_init_sideProg(%sideProg* @sideProg_instance)
       ret void
     }
 
@@ -551,6 +627,10 @@ fn nested_initializer_pous() {
     declare void @__init_sideprog(%sideProg*)
 
     declare void @sideProg(%sideProg*)
+
+    declare void @__user_init_mainProg(%mainProg*)
+
+    declare void @__user_init_sideProg(%sideProg*)
     "#);
 }
 
@@ -731,6 +811,13 @@ fn struct_types() {
     }
 
     declare void @prog(%prog*)
+
+    define void @__user_init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -744,12 +831,15 @@ fn struct_types() {
     define void @__init___testproject() {
     entry:
       call void @__init_prog(%prog* @prog_instance)
+      call void @__user_init_prog(%prog* @prog_instance)
       ret void
     }
 
     declare void @__init_prog(%prog*)
 
     declare void @prog(%prog*)
+
+    declare void @__user_init_prog(%prog*)
     "#);
 }
 
@@ -871,6 +961,20 @@ fn stateful_pous_methods_and_structs_get_init_functions() {
     }
 
     declare void @cl(%cl*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -882,12 +986,15 @@ fn stateful_pous_methods_and_structs_get_init_functions() {
     define void @__init___testproject() {
     entry:
       call void @__init_prog(%prog* @prog_instance)
+      call void @__user_init_prog(%prog* @prog_instance)
       ret void
     }
 
     declare void @__init_prog(%prog*)
 
     declare void @prog(%prog*)
+
+    declare void @__user_init_prog(%prog*)
     "#);
 }
 
@@ -965,6 +1072,20 @@ fn global_instance() {
     }
 
     declare void @prog(%prog*)
+
+    define void @__user_init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -980,6 +1101,8 @@ fn global_instance() {
     entry:
       call void @__init_prog(%prog* @prog_instance)
       call void @__init_foo(%foo* @fb)
+      call void @__user_init_prog(%prog* @prog_instance)
+      call void @__user_init_foo(%foo* @fb)
       ret void
     }
 
@@ -990,6 +1113,10 @@ fn global_instance() {
     declare void @__init_foo(%foo*)
 
     declare void @foo(%foo*)
+
+    declare void @__user_init_prog(%prog*)
+
+    declare void @__user_init_foo(%foo*)
     "#);
 }
 
@@ -1076,6 +1203,23 @@ fn aliased_types() {
     }
 
     declare void @prog(%prog*)
+
+    define void @__user_init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      %deref = load %prog*, %prog** %self, align 8
+      %fb = getelementptr inbounds %prog, %prog* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %fb)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1091,6 +1235,8 @@ fn aliased_types() {
     entry:
       call void @__init_prog(%prog* @prog_instance)
       call void @__init_foo(%foo* @global_alias)
+      call void @__user_init_prog(%prog* @prog_instance)
+      call void @__user_init_foo(%foo* @global_alias)
       ret void
     }
 
@@ -1101,6 +1247,10 @@ fn aliased_types() {
     declare void @foo(%foo*)
 
     declare void @__init_foo(%foo*)
+
+    declare void @__user_init_prog(%prog*)
+
+    declare void @__user_init_foo(%foo*)
     "#);
 }
 
@@ -1243,6 +1393,26 @@ fn var_config_aliased_variables_initialized() {
     }
 
     declare void @prog(%prog*)
+
+    define void @__user_init_FB(%FB* %0) {
+    entry:
+      %self = alloca %FB*, align 8
+      store %FB* %0, %FB** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      %deref = load %prog*, %prog** %self, align 8
+      %instance1 = getelementptr inbounds %prog, %prog* %deref, i32 0, i32 0
+      call void @__user_init_FB(%FB* %instance1)
+      %deref1 = load %prog*, %prog** %self, align 8
+      %instance2 = getelementptr inbounds %prog, %prog* %deref1, i32 0, i32 1
+      call void @__user_init_FB(%FB* %instance2)
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1259,6 +1429,7 @@ fn var_config_aliased_variables_initialized() {
     entry:
       call void @__init_prog(%prog* @prog_instance)
       call void @__init___var_config()
+      call void @__user_init_prog(%prog* @prog_instance)
       ret void
     }
 
@@ -1274,6 +1445,8 @@ fn var_config_aliased_variables_initialized() {
     declare void @prog(%prog*)
 
     declare void @FB(%FB*)
+
+    declare void @__user_init_prog(%prog*)
     "#);
 }
 
@@ -1334,6 +1507,13 @@ fn var_external_blocks_are_ignored_in_init_functions() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1410,6 +1590,13 @@ fn ref_to_local_member() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1488,6 +1675,13 @@ fn ref_to_local_member_shadows_global() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1554,6 +1748,13 @@ fn temporary_variable_ref_to_local_member() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1671,6 +1872,13 @@ fn initializing_method_variables_with_refs() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1736,6 +1944,13 @@ fn initializing_method_variables_with_refs_referencing_parent_pou_variable() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1800,6 +2015,13 @@ fn initializing_method_variables_with_refs_referencing_global_variable() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1867,6 +2089,13 @@ fn initializing_method_variables_with_refs_shadowing() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1929,6 +2158,13 @@ fn initializing_method_variables_with_alias() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1991,6 +2227,13 @@ fn initializing_method_variables_with_reference_to() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -2051,11 +2294,14 @@ fn methods_call_init_functions_for_their_members() {
       %1 = bitcast %foo* %fb to i8*
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %1, i8* align 1 bitcast (%foo* @__foo__init to i8*), i64 ptrtoint (%foo* getelementptr (%foo, %foo* null, i32 1) to i64), i1 false)
       call void @__init_foo(%foo* %fb)
+      call void @__user_init_foo(%foo* %fb)
       ret void
     }
 
     declare void @__init_foo(%foo*)
 
+    declare void @__user_init_foo(%foo*)
+
     ; Function Attrs: argmemonly nofree nounwind willreturn
     declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
 
@@ -2091,14 +2337,159 @@ fn methods_call_init_functions_for_their_members() {
     }
 
     declare void @bar(%bar*)
+
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+    ; ModuleID = '__init___testproject'
+    source_filename = "__init___testproject"
+
+    @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 0, void ()* @__init___testproject, i8* null }]
+
+    define void @__init___testproject() {
+    entry:
+      ret void
+    }
+    "#);
+}
+
+#[test]
+fn user_fb_init_is_added_and_called_if_it_exists() {
+    let src = r#"
+    FUNCTION_BLOCK foo
+    VAR
+        x : INT := 0;
+        y : INT := 0;
+    END_VAR
+        METHOD FB_INIT
+            x := 1;
+            y := 2;
+        END_METHOD
+    END_FUNCTION_BLOCK
+
+    PROGRAM prog 
+    VAR 
+        f : foo;
+    END_VAR
+        f();
+    END_PROGRAM
+  "#;
+
+    assert_snapshot!(codegen(src), @r#"
+    ; ModuleID = '<internal>'
+    source_filename = "<internal>"
+
+    %foo = type { i16, i16 }
+    %prog = type { %foo }
+
+    @__foo__init = unnamed_addr constant %foo zeroinitializer
+    @prog_instance = global %prog zeroinitializer
+
+    define void @foo(%foo* %0) {
+    entry:
+      %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
+      %y = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
+      ret void
+    }
+
+    define void @foo.FB_INIT(%foo* %0) {
+    entry:
+      %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
+      %y = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
+      store i16 1, i16* %x, align 2
+      store i16 2, i16* %y, align 2
+      ret void
+    }
+
+    define void @prog(%prog* %0) {
+    entry:
+      %f = getelementptr inbounds %prog, %prog* %0, i32 0, i32 0
+      call void @foo(%foo* %f)
+      ret void
+    }
+    ; ModuleID = '__initializers'
+    source_filename = "__initializers"
+
+    %foo = type { i16, i16 }
+    %prog = type { %foo }
+
+    @__foo__init = external global %foo
+    @prog_instance = external global %prog
+
+    define void @__init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
+    declare void @foo(%foo*)
+
+    define void @__init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      %deref = load %prog*, %prog** %self, align 8
+      %f = getelementptr inbounds %prog, %prog* %deref, i32 0, i32 0
+      call void @__init_foo(%foo* %f)
+      ret void
+    }
+
+    declare void @prog(%prog*)
+
+    define void @__user_init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      %deref = load %prog*, %prog** %self, align 8
+      %f = getelementptr inbounds %prog, %prog* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %f)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      %deref = load %foo*, %foo** %self, align 8
+      call void @foo.FB_INIT(%foo* %deref)
+      ret void
+    }
+
+    declare void @foo.FB_INIT(%foo*)
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
+    %prog = type { %foo }
+    %foo = type { i16, i16 }
+
+    @prog_instance = external global %prog
+    @__foo__init = external global %foo
     @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 0, void ()* @__init___testproject, i8* null }]
 
     define void @__init___testproject() {
     entry:
+      call void @__init_prog(%prog* @prog_instance)
+      call void @__user_init_prog(%prog* @prog_instance)
       ret void
     }
+
+    declare void @__init_prog(%prog*)
+
+    declare void @prog(%prog*)
+
+    declare void @foo(%foo*)
+
+    declare void @__user_init_prog(%prog*)
     "#);
 }
diff --git a/src/codegen/tests/initialization_test/global_initializers.rs b/src/codegen/tests/initialization_test/global_initializers.rs
index ceaea82b99..c3087e130b 100644
--- a/src/codegen/tests/initialization_test/global_initializers.rs
+++ b/src/codegen/tests/initialization_test/global_initializers.rs
@@ -163,7 +163,7 @@ fn external_pous_get_external_initializers() {
         ",
     );
 
-    insta::assert_snapshot!(result, @r###"
+    insta::assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -176,7 +176,33 @@ fn external_pous_get_external_initializers() {
     declare void @ext_fb(%ext_fb*)
 
     declare void @ext_prog(%ext_prog*)
-    "###);
+    ; ModuleID = '__initializers'
+    source_filename = "__initializers"
+
+    %ext_prog = type {}
+    %ext_fb = type {}
+
+    @ext_prog_instance = external global %ext_prog
+    @__ext_fb__init = external global %ext_fb
+
+    define void @__user_init_ext_prog(%ext_prog* %0) {
+    entry:
+      %self = alloca %ext_prog*, align 8
+      store %ext_prog* %0, %ext_prog** %self, align 8
+      ret void
+    }
+
+    declare void @ext_prog(%ext_prog*)
+
+    define void @__user_init_ext_fb(%ext_fb* %0) {
+    entry:
+      %self = alloca %ext_fb*, align 8
+      store %ext_fb* %0, %ext_fb** %self, align 8
+      ret void
+    }
+
+    declare void @ext_fb(%ext_fb*)
+    "#);
 }
 
 #[test]
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__global_initializers__initial_values_in_global_variables_out_of_order.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__global_initializers__initial_values_in_global_variables_out_of_order.snap
index ba3f625ffd..ea396b3937 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__global_initializers__initial_values_in_global_variables_out_of_order.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__global_initializers__initial_values_in_global_variables_out_of_order.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/global_initializers.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -52,6 +53,23 @@ entry:
   store %MyFB* %0, %MyFB** %self, align 8
   ret void
 }
+
+define void @__user_init_MyFB(%MyFB* %0) {
+entry:
+  %self = alloca %MyFB*, align 8
+  store %MyFB* %0, %MyFB** %self, align 8
+  ret void
+}
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  %deref = load %prg*, %prg** %self, align 8
+  %x = getelementptr inbounds %prg, %prg* %deref, i32 0, i32 0
+  call void @__user_init_MyFB(%MyFB* %x)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -67,6 +85,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
   call void @__init_myfb(%MyFB* @x)
+  call void @__user_init_prg(%prg* @prg_instance)
+  call void @__user_init_MyFB(%MyFB* @x)
   ret void
 }
 
@@ -77,3 +97,7 @@ declare void @prg(%prg*)
 declare void @MyFB(%MyFB*)
 
 declare void @__init_myfb(%MyFB*)
+
+declare void @__user_init_prg(%prg*)
+
+declare void @__user_init_MyFB(%MyFB*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__class_struct_initialized_in_function.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__class_struct_initialized_in_function.snap
index 662b7cdd14..5bacd9bd56 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__class_struct_initialized_in_function.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__class_struct_initialized_in_function.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/pou_initializers.rs
 expression: function
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -75,6 +76,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -88,6 +96,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -96,3 +105,5 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @fb(%fb*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__function_block_struct_initialized_in_function.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__function_block_struct_initialized_in_function.snap
index 0b0c6d7055..0081d0aa6b 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__function_block_struct_initialized_in_function.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__function_block_struct_initialized_in_function.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/pou_initializers.rs
 expression: function
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -28,6 +29,7 @@ entry:
   call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %3, i8* align 1 bitcast (%fb* @__fb__init to i8*), i64 ptrtoint (%fb* getelementptr (%fb, %fb* null, i32 1) to i64), i1 false)
   store i32 0, i32* %func, align 4
   call void @__init_fb(%fb* %x)
+  call void @__user_init_fb(%fb* %x)
   %func_ret = load i32, i32* %func, align 4
   ret i32 %func_ret
 }
@@ -41,6 +43,8 @@ entry:
 
 declare void @__init_fb(%fb*)
 
+declare void @__user_init_fb(%fb*)
+
 ; Function Attrs: argmemonly nofree nounwind willreturn
 declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
 
@@ -74,6 +78,23 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_fb(%fb* %0) {
+entry:
+  %self = alloca %fb*, align 8
+  store %fb* %0, %fb** %self, align 8
+  ret void
+}
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  %deref = load %main*, %main** %self, align 8
+  %fb0 = getelementptr inbounds %main, %main* %deref, i32 0, i32 0
+  call void @__user_init_fb(%fb* %fb0)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -87,6 +108,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -95,3 +117,5 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @fb(%fb*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__function_return_value_is_initialized_with_type_initializer.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__function_return_value_is_initialized_with_type_initializer.snap
index 3ada614ffd..4fc3e864ba 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__function_return_value_is_initialized_with_type_initializer.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__function_return_value_is_initialized_with_type_initializer.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/pou_initializers.rs
 expression: function
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -57,6 +58,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -68,9 +76,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_constant_values_in_pou_variables.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_constant_values_in_pou_variables.snap
index da72f42f4d..f7be60bfee 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_constant_values_in_pou_variables.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_constant_values_in_pou_variables.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/pou_initializers.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,6 +34,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -44,9 +52,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_values_in_function_block_pou.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_values_in_function_block_pou.snap
index ed28d9a08c..ef532bacad 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_values_in_function_block_pou.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_values_in_function_block_pou.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/pou_initializers.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -56,6 +57,23 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  %deref = load %main*, %main** %self, align 8
+  %fb = getelementptr inbounds %main, %main* %deref, i32 0, i32 0
+  call void @__user_init_FB(%FB* %fb)
+  ret void
+}
+
+define void @__user_init_FB(%FB* %0) {
+entry:
+  %self = alloca %FB*, align 8
+  store %FB* %0, %FB** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -69,6 +87,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -77,3 +96,5 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @FB(%FB*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_values_in_program_pou.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_values_in_program_pou.snap
index 2aadb6af53..c7f8e6c952 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_values_in_program_pou.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__initial_values_in_program_pou.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/pou_initializers.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -34,6 +35,13 @@ entry:
 }
 
 declare void @Main(%Main*)
+
+define void @__user_init_Main(%Main* %0) {
+entry:
+  %self = alloca %Main*, align 8
+  store %Main* %0, %Main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -45,9 +53,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%Main* @Main_instance)
+  call void @__user_init_Main(%Main* @Main_instance)
   ret void
 }
 
 declare void @__init_main(%Main*)
 
 declare void @Main(%Main*)
+
+declare void @__user_init_Main(%Main*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__no_memcpy_for_struct_initialization_in_program.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__no_memcpy_for_struct_initialization_in_program.snap
index 4df2c3cb57..3eaf4239a1 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__no_memcpy_for_struct_initialization_in_program.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__pou_initializers__no_memcpy_for_struct_initialization_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/pou_initializers.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @prog(%prog*)
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -56,9 +64,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
   ret void
 }
 
 declare void @__init_prog(%prog*)
 
 declare void @prog(%prog*)
+
+declare void @__user_init_prog(%prog*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__array_of_struct_initialization.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__array_of_struct_initialization.snap
index 98729d65b9..fea1c5c037 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__array_of_struct_initialization.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__array_of_struct_initialization.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/type_initializers.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -46,6 +47,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -63,6 +71,7 @@ entry:
   call void @__init_main(%main* @main_instance)
   call void @__init_mystruct(%myStruct* @str)
   call void @__init_mystruct(%myStruct* @alias_str)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -71,3 +80,5 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @__init_mystruct(%myStruct*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__initial_values_in_fb_variable.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__initial_values_in_fb_variable.snap
index c30bc1b892..a7ac8af2ee 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__initial_values_in_fb_variable.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__initial_values_in_fb_variable.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/type_initializers.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -59,6 +60,26 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  %deref = load %main*, %main** %self, align 8
+  %struct1 = getelementptr inbounds %main, %main* %deref, i32 0, i32 1
+  call void @__user_init_TON(%TON* %struct1)
+  %deref1 = load %main*, %main** %self, align 8
+  %struct2 = getelementptr inbounds %main, %main* %deref1, i32 0, i32 2
+  call void @__user_init_TON(%TON* %struct2)
+  ret void
+}
+
+define void @__user_init_TON(%TON* %0) {
+entry:
+  %self = alloca %TON*, align 8
+  store %TON* %0, %TON** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -72,6 +93,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -80,3 +102,5 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @TON(%TON*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__skipped_field_members_for_array_of_structs_are_zero_initialized.snap b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__skipped_field_members_for_array_of_structs_are_zero_initialized.snap
index 54b867bc58..49967a03dc 100644
--- a/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__skipped_field_members_for_array_of_structs_are_zero_initialized.snap
+++ b/src/codegen/tests/initialization_test/snapshots/rusty__codegen__tests__initialization_test__type_initializers__skipped_field_members_for_array_of_structs_are_zero_initialized.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/initialization_test/type_initializers.rs
 expression: res
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -52,6 +53,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -67,9 +75,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/online_change_tests.rs b/src/codegen/tests/online_change_tests.rs
index 6c0e3dad30..6a64f75b7d 100644
--- a/src/codegen/tests/online_change_tests.rs
+++ b/src/codegen/tests/online_change_tests.rs
@@ -54,14 +54,14 @@ fn generate_program_with_online_change() {
         END_PROGRAM
         ",
     );
-    assert_snapshot!(src, @r###"
+    assert_snapshot!(src, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
     %prg = type { i32 }
 
     @prg_instance = global %prg zeroinitializer, section "$RUSTY$var-prg_instance:r1i32"
-    @__custom_got = weak_odr global [10 x i8*] zeroinitializer
+    @__custom_got = weak_odr global [12 x i8*] zeroinitializer
 
     define void @prg(%prg* %0) section "$RUSTY$fn-prg:v[]" {
     entry:
@@ -74,7 +74,7 @@ fn generate_program_with_online_change() {
     %prg = type { i32 }
 
     @prg_instance = external global %prg, section "$RUSTY$var-prg_instance:r1i32"
-    @__custom_got = weak_odr global [10 x i8*] zeroinitializer
+    @__custom_got = weak_odr global [12 x i8*] zeroinitializer
 
     define void @__init_prg(%prg* %0) section "$RUSTY$fn-__init_prg:v[pr1i32]" {
     entry:
@@ -84,26 +84,37 @@ fn generate_program_with_online_change() {
     }
 
     declare void @prg(%prg*) section "$RUSTY$fn-prg:v[]"
+
+    define void @__user_init_prg(%prg* %0) section "$RUSTY$fn-__user_init_prg:v[pr1i32]" {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
     %prg = type { i32 }
 
     @prg_instance = external global %prg, section "$RUSTY$var-prg_instance:r1i32"
-    @__custom_got = weak_odr global [10 x i8*] zeroinitializer
+    @__custom_got = weak_odr global [12 x i8*] zeroinitializer
     @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 0, void ()* @__init___testproject, i8* null }]
 
     define void @__init___testproject() section "$RUSTY$fn-__init___testproject:v[]" {
     entry:
       %0 = load void (%prg*)*, void (%prg*)** getelementptr inbounds (void (%prg*)*, void (%prg*)** inttoptr (i64 -2401053092612145152 to void (%prg*)**), i32 7), align 8
       call void %0(%prg* @prg_instance)
+      %1 = load void (%prg*)*, void (%prg*)** getelementptr inbounds (void (%prg*)*, void (%prg*)** inttoptr (i64 -2401053092612145152 to void (%prg*)**), i32 9), align 8
+      call void %1(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*) section "$RUSTY$fn-__init_prg:v[pr1i32]"
 
     declare void @prg(%prg*) section "$RUSTY$fn-prg:v[]"
-    "###)
+
+    declare void @__user_init_prg(%prg*) section "$RUSTY$fn-__user_init_prg:v[pr1i32]"
+    "#)
 }
 
 #[test]
@@ -122,7 +133,7 @@ fn generate_program_and_var_with_online_change() {
         END_VAR
         ",
     );
-    assert_snapshot!(src, @r###"
+    assert_snapshot!(src, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -130,7 +141,7 @@ fn generate_program_and_var_with_online_change() {
 
     @gV = global i32 0, section "$RUSTY$var-gv:i32"
     @prg_instance = global %prg zeroinitializer, section "$RUSTY$var-prg_instance:r1i32"
-    @__custom_got = weak_odr global [12 x i8*] zeroinitializer
+    @__custom_got = weak_odr global [14 x i8*] zeroinitializer
 
     define void @prg(%prg* %0) section "$RUSTY$fn-prg:v[]" {
     entry:
@@ -146,7 +157,7 @@ fn generate_program_and_var_with_online_change() {
     %prg = type { i32 }
 
     @prg_instance = external global %prg, section "$RUSTY$var-prg_instance:r1i32"
-    @__custom_got = weak_odr global [12 x i8*] zeroinitializer
+    @__custom_got = weak_odr global [14 x i8*] zeroinitializer
 
     define void @__init_prg(%prg* %0) section "$RUSTY$fn-__init_prg:v[pr1i32]" {
     entry:
@@ -156,26 +167,37 @@ fn generate_program_and_var_with_online_change() {
     }
 
     declare void @prg(%prg*) section "$RUSTY$fn-prg:v[]"
+
+    define void @__user_init_prg(%prg* %0) section "$RUSTY$fn-__user_init_prg:v[pr1i32]" {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
     %prg = type { i32 }
 
     @prg_instance = external global %prg, section "$RUSTY$var-prg_instance:r1i32"
-    @__custom_got = weak_odr global [12 x i8*] zeroinitializer
+    @__custom_got = weak_odr global [14 x i8*] zeroinitializer
     @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 0, void ()* @__init___testproject, i8* null }]
 
     define void @__init___testproject() section "$RUSTY$fn-__init___testproject:v[]" {
     entry:
       %0 = load void (%prg*)*, void (%prg*)** getelementptr inbounds (void (%prg*)*, void (%prg*)** inttoptr (i64 -2401053092612145152 to void (%prg*)**), i32 9), align 8
       call void %0(%prg* @prg_instance)
+      %1 = load void (%prg*)*, void (%prg*)** getelementptr inbounds (void (%prg*)*, void (%prg*)** inttoptr (i64 -2401053092612145152 to void (%prg*)**), i32 11), align 8
+      call void %1(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*) section "$RUSTY$fn-__init_prg:v[pr1i32]"
 
     declare void @prg(%prg*) section "$RUSTY$fn-prg:v[]"
-    "###)
+
+    declare void @__user_init_prg(%prg*) section "$RUSTY$fn-__user_init_prg:v[pr1i32]"
+    "#)
 }
 
 #[test]
diff --git a/src/codegen/tests/oop_tests.rs b/src/codegen/tests/oop_tests.rs
index 6c86a77017..17754787b5 100644
--- a/src/codegen/tests/oop_tests.rs
+++ b/src/codegen/tests/oop_tests.rs
@@ -18,7 +18,7 @@ fn members_from_base_class_are_available_in_subclasses() {
         END_FUNCTION_BLOCK
         "#,
     );
-    insta::assert_snapshot!(result, @r###"
+    insta::assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -60,11 +60,28 @@ fn members_from_base_class_are_available_in_subclasses() {
       ret void
     }
 
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      %deref = load %bar*, %bar** %self, align 8
+      %__foo = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %__foo)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
     }
-    "###);
+    "#);
 }
 
 #[test]
@@ -90,7 +107,7 @@ fn write_to_parent_variable_qualified_access() {
        ",
     );
 
-    insta::assert_snapshot!(res, @r###"
+    insta::assert_snapshot!(res, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -152,11 +169,38 @@ fn write_to_parent_variable_qualified_access() {
       ret void
     }
 
+    define void @__user_init_fb(%fb* %0) {
+    entry:
+      %self = alloca %fb*, align 8
+      store %fb* %0, %fb** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_fb2(%fb2* %0) {
+    entry:
+      %self = alloca %fb2*, align 8
+      store %fb2* %0, %fb2** %self, align 8
+      %deref = load %fb2*, %fb2** %self, align 8
+      %__fb = getelementptr inbounds %fb2, %fb2* %deref, i32 0, i32 0
+      call void @__user_init_fb(%fb* %__fb)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      %deref = load %foo*, %foo** %self, align 8
+      %myFb = getelementptr inbounds %foo, %foo* %deref, i32 0, i32 0
+      call void @__user_init_fb2(%fb2* %myFb)
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
     }
-    "###);
+    "#);
 }
 
 #[test]
@@ -186,7 +230,7 @@ fn write_to_parent_variable_in_instance() {
         END_FUNCTION
     "#,
     );
-    insta::assert_snapshot!(result, @r###"
+    insta::assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -231,6 +275,7 @@ fn write_to_parent_variable_in_instance() {
       %1 = bitcast %bar* %fb to i8*
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %1, i8* align 1 getelementptr inbounds (%bar, %bar* @__bar__init, i32 0, i32 0, i32 0, i32 0), i64 ptrtoint (%bar* getelementptr (%bar, %bar* null, i32 1) to i64), i1 false)
       call void @__init_bar(%bar* %fb)
+      call void @__user_init_bar(%bar* %fb)
       %__foo = getelementptr inbounds %bar, %bar* %fb, i32 0, i32 0
       call void @foo.baz(%foo* %__foo)
       call void @bar(%bar* %fb)
@@ -263,6 +308,23 @@ fn write_to_parent_variable_in_instance() {
       ret void
     }
 
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      %deref = load %bar*, %bar** %self, align 8
+      %__foo = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %__foo)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -270,7 +332,7 @@ fn write_to_parent_variable_in_instance() {
 
     attributes #0 = { argmemonly nofree nounwind willreturn }
     attributes #1 = { argmemonly nofree nounwind willreturn writeonly }
-    "###);
+    "#);
 }
 
 #[test]
@@ -309,7 +371,7 @@ fn array_in_parent_generated() {
         END_FUNCTION
         "#,
     );
-    insta::assert_snapshot!(result, @r###"
+    insta::assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -406,13 +468,40 @@ fn array_in_parent_generated() {
       ret void
     }
 
+    define void @__user_init_grandparent(%grandparent* %0) {
+    entry:
+      %self = alloca %grandparent*, align 8
+      store %grandparent* %0, %grandparent** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      %deref = load %parent*, %parent** %self, align 8
+      %__grandparent = getelementptr inbounds %parent, %parent* %deref, i32 0, i32 0
+      call void @__user_init_grandparent(%grandparent* %__grandparent)
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
     }
 
     attributes #0 = { argmemonly nofree nounwind willreturn writeonly }
-    "###);
+    "#);
 }
 
 #[test]
@@ -442,7 +531,7 @@ fn complex_array_access_generated() {
         "#,
     );
 
-    insta::assert_snapshot!(result, @r###"
+    insta::assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -528,11 +617,38 @@ fn complex_array_access_generated() {
       ret void
     }
 
+    define void @__user_init_grandparent(%grandparent* %0) {
+    entry:
+      %self = alloca %grandparent*, align 8
+      store %grandparent* %0, %grandparent** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      %deref = load %parent*, %parent** %self, align 8
+      %__grandparent = getelementptr inbounds %parent, %parent* %deref, i32 0, i32 0
+      call void @__user_init_grandparent(%grandparent* %__grandparent)
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
     }
-    "###);
+    "#);
 }
 
 #[test]
diff --git a/src/codegen/tests/oop_tests/debug_tests.rs b/src/codegen/tests/oop_tests/debug_tests.rs
index 7be988b277..ecde257f42 100644
--- a/src/codegen/tests/oop_tests/debug_tests.rs
+++ b/src/codegen/tests/oop_tests/debug_tests.rs
@@ -63,6 +63,23 @@ fn members_from_base_class_are_available_in_subclasses() {
       ret void
     }
 
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      %deref = load %bar*, %bar** %self, align 8
+      %__foo = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %__foo)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -203,6 +220,33 @@ fn write_to_parent_variable_qualified_access() {
       ret void
     }
 
+    define void @__user_init_fb(%fb* %0) {
+    entry:
+      %self = alloca %fb*, align 8
+      store %fb* %0, %fb** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_fb2(%fb2* %0) {
+    entry:
+      %self = alloca %fb2*, align 8
+      store %fb2* %0, %fb2** %self, align 8
+      %deref = load %fb2*, %fb2** %self, align 8
+      %__fb = getelementptr inbounds %fb2, %fb2* %deref, i32 0, i32 0
+      call void @__user_init_fb(%fb* %__fb)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      %deref = load %foo*, %foo** %self, align 8
+      %myFb = getelementptr inbounds %foo, %foo* %deref, i32 0, i32 0
+      call void @__user_init_fb2(%fb2* %myFb)
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -332,6 +376,7 @@ fn write_to_parent_variable_in_instance() {
       %1 = bitcast %bar* %fb to i8*
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %1, i8* align 1 getelementptr inbounds (%bar, %bar* @__bar__init, i32 0, i32 0, i32 0, i32 0), i64 ptrtoint (%bar* getelementptr (%bar, %bar* null, i32 1) to i64), i1 false)
       call void @__init_bar(%bar* %fb), !dbg !42
+      call void @__user_init_bar(%bar* %fb), !dbg !42
       %__foo = getelementptr inbounds %bar, %bar* %fb, i32 0, i32 0, !dbg !42
       call void @foo.baz(%foo* %__foo), !dbg !43
       call void @bar(%bar* %fb), !dbg !44
@@ -367,6 +412,23 @@ fn write_to_parent_variable_in_instance() {
       ret void
     }
 
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      %deref = load %bar*, %bar** %self, align 8
+      %__foo = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %__foo)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -568,6 +630,33 @@ fn array_in_parent_generated() {
       ret void
     }
 
+    define void @__user_init_grandparent(%grandparent* %0) {
+    entry:
+      %self = alloca %grandparent*, align 8
+      store %grandparent* %0, %grandparent** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      %deref = load %parent*, %parent** %self, align 8
+      %__grandparent = getelementptr inbounds %parent, %parent* %deref, i32 0, i32 0
+      call void @__user_init_grandparent(%grandparent* %__grandparent)
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -760,6 +849,33 @@ fn complex_array_access_generated() {
       ret void
     }
 
+    define void @__user_init_grandparent(%grandparent* %0) {
+    entry:
+      %self = alloca %grandparent*, align 8
+      store %grandparent* %0, %grandparent** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      %deref = load %parent*, %parent** %self, align 8
+      %__grandparent = getelementptr inbounds %parent, %parent* %deref, i32 0, i32 0
+      call void @__user_init_grandparent(%grandparent* %__grandparent)
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -834,7 +950,7 @@ fn function_block_method_debug_info() {
         END_FUNCTION_BLOCK
     "#,
     );
-    insta::assert_snapshot!(result, @r###"
+    insta::assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -884,6 +1000,23 @@ fn function_block_method_debug_info() {
       ret void
     }
 
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      %deref = load %bar*, %bar** %self, align 8
+      %__foo = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %__foo)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -921,7 +1054,7 @@ fn function_block_method_debug_info() {
     !24 = !{null, !7}
     !25 = !DILocalVariable(name: "bar", scope: !22, file: !2, line: 8, type: !7)
     !26 = !DILocation(line: 8, column: 8, scope: !22)
-    "###);
+    "#);
 }
 
 #[test]
@@ -986,7 +1119,7 @@ END_FUNCTION
 ",
     );
 
-    insta::assert_snapshot!(result, @r###"
+    insta::assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -1054,6 +1187,9 @@ END_FUNCTION
       call void @__init_parent(%parent* %parent1), !dbg !61
       call void @__init_child(%child* %child1), !dbg !61
       call void @__init_grandchild(%grandchild* %grandchild1), !dbg !61
+      call void @__user_init_parent(%parent* %parent1), !dbg !61
+      call void @__user_init_child(%child* %child1), !dbg !61
+      call void @__user_init_grandchild(%grandchild* %grandchild1), !dbg !61
       %a = getelementptr inbounds %parent, %parent* %parent1, i32 0, i32 0, !dbg !62
       store i32 1, i32* %a, align 4, !dbg !62
       %__parent = getelementptr inbounds %child, %child* %child1, i32 0, i32 0, !dbg !63
@@ -1176,6 +1312,33 @@ END_FUNCTION
       ret void
     }
 
+    define void @__user_init_grandchild(%grandchild* %0) {
+    entry:
+      %self = alloca %grandchild*, align 8
+      store %grandchild* %0, %grandchild** %self, align 8
+      %deref = load %grandchild*, %grandchild** %self, align 8
+      %__child = getelementptr inbounds %grandchild, %grandchild* %deref, i32 0, i32 0
+      call void @__user_init_child(%child* %__child)
+      ret void
+    }
+
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -1275,5 +1438,5 @@ END_FUNCTION
     !84 = !DILocation(line: 53, column: 4, scope: !39)
     !85 = !DILocation(line: 54, column: 4, scope: !39)
     !86 = !DILocation(line: 56, scope: !39)
-    "###);
+    "#);
 }
diff --git a/src/codegen/tests/parameters_tests.rs b/src/codegen/tests/parameters_tests.rs
index 4e242816ca..a03c390404 100644
--- a/src/codegen/tests/parameters_tests.rs
+++ b/src/codegen/tests/parameters_tests.rs
@@ -1114,7 +1114,7 @@ fn by_value_fb_arg_aggregates_are_memcopied() {
         "#,
     );
 
-    assert_snapshot!(result, @r###"
+    assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -1136,6 +1136,7 @@ fn by_value_fb_arg_aggregates_are_memcopied() {
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %2, i8* align 1 getelementptr inbounds (%FOO, %FOO* @__FOO__init, i32 0, i32 0, i32 0), i64 ptrtoint (%FOO* getelementptr (%FOO, %FOO* null, i32 1) to i64), i1 false)
       store i32 0, i32* %main, align 4
       call void @__init_foo(%FOO* %fb)
+      call void @__user_init_FOO(%FOO* %fb)
       %3 = getelementptr inbounds %FOO, %FOO* %fb, i32 0, i32 0
       %4 = bitcast [65537 x i8]* %3 to i8*
       %5 = bitcast [65537 x i8]* %str to i8*
@@ -1158,6 +1159,8 @@ fn by_value_fb_arg_aggregates_are_memcopied() {
 
     declare void @__init_foo(%FOO*)
 
+    declare void @__user_init_FOO(%FOO*)
+
     ; Function Attrs: argmemonly nofree nounwind willreturn writeonly
     declare void @llvm.memset.p0i8.i64(i8* nocapture writeonly, i8, i64, i1 immarg) #0
 
@@ -1184,6 +1187,13 @@ fn by_value_fb_arg_aggregates_are_memcopied() {
     }
 
     declare void @FOO(%FOO*)
+
+    define void @__user_init_FOO(%FOO* %0) {
+    entry:
+      %self = alloca %FOO*, align 8
+      store %FOO* %0, %FOO** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1193,7 +1203,7 @@ fn by_value_fb_arg_aggregates_are_memcopied() {
     entry:
       ret void
     }
-    "###);
+    "#);
 }
 
 #[test]
@@ -1229,7 +1239,7 @@ fn var_output_aggregate_types_are_memcopied() {
         "#,
     );
 
-    assert_snapshot!(result, @r###"
+    assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -1334,6 +1344,23 @@ fn var_output_aggregate_types_are_memcopied() {
     }
 
     declare void @PRG(%PRG*)
+
+    define void @__user_init_FB(%FB* %0) {
+    entry:
+      %self = alloca %FB*, align 8
+      store %FB* %0, %FB** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_PRG(%PRG* %0) {
+    entry:
+      %self = alloca %PRG*, align 8
+      store %PRG* %0, %PRG** %self, align 8
+      %deref = load %PRG*, %PRG** %self, align 8
+      %station = getelementptr inbounds %PRG, %PRG* %deref, i32 0, i32 5
+      call void @__user_init_FB(%FB* %station)
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1349,6 +1376,7 @@ fn var_output_aggregate_types_are_memcopied() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%PRG* @PRG_instance)
+      call void @__user_init_PRG(%PRG* @PRG_instance)
       ret void
     }
 
@@ -1357,5 +1385,7 @@ fn var_output_aggregate_types_are_memcopied() {
     declare void @PRG(%PRG*)
 
     declare void @FB(%FB*)
-    "###);
+
+    declare void @__user_init_PRG(%PRG*)
+    "#);
 }
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__a_global_variables_generates_in_separate_global_variables.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__a_global_variables_generates_in_separate_global_variables.snap
index 44991c1b54..3e5ac85244 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__a_global_variables_generates_in_separate_global_variables.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__a_global_variables_generates_in_separate_global_variables.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -30,6 +31,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -41,9 +49,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__accessing_nested_array_in_struct.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__accessing_nested_array_in_struct.snap
index d6b3ecfb1d..bf2753f057 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__accessing_nested_array_in_struct.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__accessing_nested_array_in_struct.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -46,6 +47,13 @@ entry:
 }
 
 declare void @Main(%Main*)
+
+define void @__user_init_Main(%Main* %0) {
+entry:
+  %self = alloca %Main*, align 8
+  store %Main* %0, %Main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%Main* @Main_instance)
+  call void @__user_init_Main(%Main* @Main_instance)
   ret void
 }
 
 declare void @__init_main(%Main*)
 
 declare void @Main(%Main*)
+
+declare void @__user_init_Main(%Main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__accessing_nested_structs.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__accessing_nested_structs.snap
index 1e9b679fa5..764ce85b9c 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__accessing_nested_structs.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__accessing_nested_structs.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -66,6 +67,13 @@ entry:
 }
 
 declare void @Main(%Main*)
+
+define void @__user_init_Main(%Main* %0) {
+entry:
+  %self = alloca %Main*, align 8
+  store %Main* %0, %Main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -81,9 +89,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%Main* @Main_instance)
+  call void @__user_init_Main(%Main* @Main_instance)
   ret void
 }
 
 declare void @__init_main(%Main*)
 
 declare void @Main(%Main*)
+
+declare void @__user_init_Main(%Main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__action_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__action_called_in_program.snap
index 5f93d2a33c..ff48e55234 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__action_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__action_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -37,6 +38,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -48,9 +56,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_cast_int_type_generated.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_cast_int_type_generated.snap
index bccf7c72d2..3fcdcfb45a 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_cast_int_type_generated.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_cast_int_type_generated.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -29,6 +30,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -40,9 +48,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_non_zero_negative_type_generated.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_non_zero_negative_type_generated.snap
index fe84dd0860..c3863a619f 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_non_zero_negative_type_generated.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_non_zero_negative_type_generated.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -29,6 +30,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -40,9 +48,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_non_zero_type_generated.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_non_zero_type_generated.snap
index bccf7c72d2..3fcdcfb45a 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_non_zero_type_generated.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_non_zero_type_generated.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -29,6 +30,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -40,9 +48,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_generated.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_generated.snap
index bccf7c72d2..3fcdcfb45a 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_generated.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_generated.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -29,6 +30,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -40,9 +48,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_used.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_used.snap
index 9c3befd40b..b826825e11 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_used.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_used.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_with_non_zero_negative_start_used.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_with_non_zero_negative_start_used.snap
index d1f76ddc10..6ebfcdbda1 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_with_non_zero_negative_start_used.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_with_non_zero_negative_start_used.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_with_non_zero_start_used.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_with_non_zero_start_used.snap
index fac2221040..ae4b4e3da7 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_with_non_zero_start_used.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_int_type_with_non_zero_start_used.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_struct_as_member_of_another_struct_and_variable_declaration_is_initialized.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_struct_as_member_of_another_struct_and_variable_declaration_is_initialized.snap
index 0b0680e2f2..b75807f0b3 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_struct_as_member_of_another_struct_and_variable_declaration_is_initialized.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_struct_as_member_of_another_struct_and_variable_declaration_is_initialized.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: res
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -52,6 +53,13 @@ entry:
 }
 
 declare void @mainProg(%mainProg*)
+
+define void @__user_init_mainProg(%mainProg* %0) {
+entry:
+  %self = alloca %mainProg*, align 8
+  store %mainProg* %0, %mainProg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -67,9 +75,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_mainprog(%mainProg* @mainProg_instance)
+  call void @__user_init_mainProg(%mainProg* @mainProg_instance)
   ret void
 }
 
 declare void @__init_mainprog(%mainProg*)
 
 declare void @mainProg(%mainProg*)
+
+declare void @__user_init_mainProg(%mainProg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_struct_as_member_of_another_struct_is_initialized.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_struct_as_member_of_another_struct_is_initialized.snap
index 7ec2f34a03..7d914a18c2 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_struct_as_member_of_another_struct_is_initialized.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__array_of_struct_as_member_of_another_struct_is_initialized.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: res
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -55,6 +56,13 @@ entry:
 }
 
 declare void @mainProg(%mainProg*)
+
+define void @__user_init_mainProg(%mainProg* %0) {
+entry:
+  %self = alloca %mainProg*, align 8
+  store %mainProg* %0, %mainProg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -70,9 +78,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_mainprog(%mainProg* @mainProg_instance)
+  call void @__user_init_mainProg(%mainProg* @mainProg_instance)
   ret void
 }
 
 declare void @__init_mainprog(%mainProg*)
 
 declare void @mainProg(%mainProg*)
+
+declare void @__user_init_mainProg(%mainProg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__case_with_multiple_labels_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__case_with_multiple_labels_statement.snap
index 40010bdf18..7d30092a19 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__case_with_multiple_labels_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__case_with_multiple_labels_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -51,6 +52,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -62,9 +70,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__case_with_ranges_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__case_with_ranges_statement.snap
index ca373a05a2..f3e9c28db4 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__case_with_ranges_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__case_with_ranges_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -52,6 +53,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -63,9 +71,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_bool_code_gen_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_bool_code_gen_test.snap
index 3b9f17d68d..92be7443de 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_bool_code_gen_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_bool_code_gen_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,6 +34,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -44,9 +52,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_code_gen_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_code_gen_test.snap
index 33bf683047..2f69cbbc0c 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_code_gen_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_code_gen_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_hex_code_gen_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_hex_code_gen_test.snap
index 8a9833e220..a1ed6bfef9 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_hex_code_gen_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_hex_code_gen_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_hex_ints_code_gen_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_hex_ints_code_gen_test.snap
index d790057080..aa0683bb0c 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_hex_ints_code_gen_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_hex_ints_code_gen_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_lreal_code_gen_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_lreal_code_gen_test.snap
index 25d965c5f0..703044fc24 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_lreal_code_gen_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_lreal_code_gen_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_real_code_gen_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_real_code_gen_test.snap
index ddca79306b..2bbbca44e8 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_real_code_gen_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__casted_literals_real_code_gen_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -34,6 +35,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -45,9 +53,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_method_in_pou.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_method_in_pou.snap
index f65f238e7a..fc32ec59e4 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_method_in_pou.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_method_in_pou.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -80,6 +81,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -93,6 +101,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -101,3 +110,5 @@ declare void @__init_prg(%prg*)
 declare void @prg(%prg*)
 
 declare void @MyClass(%MyClass*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__complex_pointers.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__complex_pointers.snap
index 0754019c69..95226d335f 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__complex_pointers.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__complex_pointers.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -57,6 +58,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -68,9 +76,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__constant_expression_in_function_blocks_are_propagated.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__constant_expression_in_function_blocks_are_propagated.snap
index 3dd782daeb..06e0a23372 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__constant_expression_in_function_blocks_are_propagated.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__constant_expression_in_function_blocks_are_propagated.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @fbWithConstant(%fbWithConstant*)
+
+define void @__user_init_fbWithConstant(%fbWithConstant* %0) {
+entry:
+  %self = alloca %fbWithConstant*, align 8
+  store %fbWithConstant* %0, %fbWithConstant** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__constant_expressions_in_ranged_type_declaration_are_propagated.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__constant_expressions_in_ranged_type_declaration_are_propagated.snap
index 87faa6439a..035ea8d94d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__constant_expressions_in_ranged_type_declaration_are_propagated.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__constant_expressions_in_ranged_type_declaration_are_propagated.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -48,6 +49,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__contants_in_case_statements_resolved.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__contants_in_case_statements_resolved.snap
index 43b0524edd..a0494ae253 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__contants_in_case_statements_resolved.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__contants_in_case_statements_resolved.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -67,6 +68,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -78,9 +86,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__date_and_time_global_constants_initialize.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__date_and_time_global_constants_initialize.snap
index 2069d4a1be..22332dcf9e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__date_and_time_global_constants_initialize.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__date_and_time_global_constants_initialize.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -92,6 +93,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -103,9 +111,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__date_comparisons.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__date_comparisons.snap
index d26bc54b62..88852ac13b 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__date_comparisons.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__date_comparisons.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -40,6 +41,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -51,9 +59,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__different_case_references.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__different_case_references.snap
index 329bdf1780..d89122d2d7 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__different_case_references.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__different_case_references.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_global_variable_list_generates_nothing.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_global_variable_list_generates_nothing.snap
index e6069e8aa5..52c51df1cd 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_global_variable_list_generates_nothing.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_global_variable_list_generates_nothing.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -28,6 +29,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -39,9 +47,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_program_with_name_generates_void_function.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_program_with_name_generates_void_function.snap
index d2dda847f8..e3be291a50 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_program_with_name_generates_void_function.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_program_with_name_generates_void_function.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -28,6 +29,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -39,9 +47,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_statements_dont_generate_anything.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_statements_dont_generate_anything.snap
index 4ff968b283..403f3fca07 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_statements_dont_generate_anything.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__empty_statements_dont_generate_anything.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -32,6 +33,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -43,9 +51,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__enum_members_can_be_used_in_asignments.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__enum_members_can_be_used_in_asignments.snap
index b7d5af589d..c157c8625b 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__enum_members_can_be_used_in_asignments.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__enum_members_can_be_used_in_asignments.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__enums_custom_type_are_generated.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__enums_custom_type_are_generated.snap
index 771dbfa4cc..abbd719b58 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__enums_custom_type_are_generated.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__enums_custom_type_are_generated.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,6 +34,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -44,9 +52,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_function_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_function_called_in_program.snap
index b5d2e7b65c..c5107a140c 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_function_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_function_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_global_variable_generates_as_external.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_global_variable_generates_as_external.snap
index 7be0e89310..d128509246 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_global_variable_generates_as_external.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_global_variable_generates_as_external.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -30,6 +31,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -41,9 +49,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_program_global_var_is_external.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_program_global_var_is_external.snap
index bff4e8363c..51583a12bf 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_program_global_var_is_external.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__external_program_global_var_is_external.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -10,3 +11,18 @@ source_filename = "<internal>"
 @prg_instance = external global %prg
 
 declare void @prg(%prg*)
+; ModuleID = '__initializers'
+source_filename = "__initializers"
+
+%prg = type { i32, i32 }
+
+@prg_instance = external global %prg
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+declare void @prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_called_as_function.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_called_as_function.snap
index 9ef4849160..b35bfe5e38 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_called_as_function.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_called_as_function.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: prg
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -63,6 +64,13 @@ entry:
 }
 
 declare void @MyClass(%MyClass*)
+
+define void @__user_init_MyClass(%MyClass* %0) {
+entry:
+  %self = alloca %MyClass*, align 8
+  store %MyClass* %0, %MyClass** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_in_pou.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_in_pou.snap
index f65f238e7a..6da63e71f3 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_in_pou.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_in_pou.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -80,6 +81,23 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_MyClass(%MyClass* %0) {
+entry:
+  %self = alloca %MyClass*, align 8
+  store %MyClass* %0, %MyClass** %self, align 8
+  ret void
+}
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  %deref = load %prg*, %prg** %self, align 8
+  %cl = getelementptr inbounds %prg, %prg* %deref, i32 0, i32 0
+  call void @__user_init_MyClass(%MyClass* %cl)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -93,6 +111,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -101,3 +120,5 @@ declare void @__init_prg(%prg*)
 declare void @prg(%prg*)
 
 declare void @MyClass(%MyClass*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_in_out.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_in_out.snap
index 45b2c23fd0..37cf1122d2 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_in_out.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_in_out.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: prg
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -66,6 +67,23 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_MyClass(%MyClass* %0) {
+entry:
+  %self = alloca %MyClass*, align 8
+  store %MyClass* %0, %MyClass** %self, align 8
+  ret void
+}
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  %deref = load %prg*, %prg** %self, align 8
+  %cl = getelementptr inbounds %prg, %prg* %deref, i32 0, i32 0
+  call void @__user_init_MyClass(%MyClass* %cl)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -79,6 +97,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -87,3 +106,5 @@ declare void @__init_prg(%prg*)
 declare void @prg(%prg*)
 
 declare void @MyClass(%MyClass*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_input_defaults.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_input_defaults.snap
index 37143801a4..4927036493 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_input_defaults.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_input_defaults.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: prg
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -64,6 +65,23 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_MyClass(%MyClass* %0) {
+entry:
+  %self = alloca %MyClass*, align 8
+  store %MyClass* %0, %MyClass** %self, align 8
+  ret void
+}
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  %deref = load %prg*, %prg** %self, align 8
+  %cl = getelementptr inbounds %prg, %prg* %deref, i32 0, i32 0
+  call void @__user_init_MyClass(%MyClass* %cl)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -77,6 +95,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -85,3 +104,5 @@ declare void @__init_prg(%prg*)
 declare void @prg(%prg*)
 
 declare void @MyClass(%MyClass*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_continue.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_continue.snap
index c3492cdf88..20a38edafa 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_continue.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_continue.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -53,6 +54,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -64,9 +72,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_int.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_int.snap
index 35ee999116..88b2edcf8d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_int.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_int.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -57,6 +58,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -68,9 +76,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_lint.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_lint.snap
index 9e29ac3669..b6f358ff79 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_lint.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_lint.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -53,6 +54,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -64,9 +72,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_sint.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_sint.snap
index 2d656e980c..ce781644ee 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_sint.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_sint.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -57,6 +58,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -68,9 +76,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_continue.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_continue.snap
index e6f2f955c9..fac8c03c78 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_continue.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_continue.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -61,6 +62,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -72,9 +80,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_exit.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_exit.snap
index 8ecbfd3d41..aac9fdf4c3 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_exit.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_exit.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -61,6 +62,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -72,9 +80,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_references_steps_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_references_steps_test.snap
index c0707f51e1..5393c070ea 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_references_steps_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_references_steps_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -62,6 +63,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -73,9 +81,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_steps_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_steps_test.snap
index d91707fe21..4137b8dca8 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_steps_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_with_steps_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -53,6 +54,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -64,9 +72,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_without_steps_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_without_steps_test.snap
index 270ad3376b..39cc2a3576 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_without_steps_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__for_statement_without_steps_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -53,6 +54,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -64,9 +72,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_block_instance_call.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_block_instance_call.snap
index 841a833c56..b9f9650ad1 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_block_instance_call.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_block_instance_call.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -53,6 +54,23 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  %deref = load %prg*, %prg** %self, align 8
+  %fb_inst = getelementptr inbounds %prg, %prg* %deref, i32 0, i32 0
+  call void @__user_init_foo(%foo* %fb_inst)
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -66,6 +84,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -74,3 +93,5 @@ declare void @__init_prg(%prg*)
 declare void @prg(%prg*)
 
 declare void @foo(%foo*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_block_qualified_instance_call.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_block_qualified_instance_call.snap
index dfaabf7fa1..2d48030447 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_block_qualified_instance_call.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_block_qualified_instance_call.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -74,6 +75,33 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  %deref = load %prg*, %prg** %self, align 8
+  %foo_inst = getelementptr inbounds %prg, %prg* %deref, i32 0, i32 0
+  call void @__user_init_foo(%foo* %foo_inst)
+  ret void
+}
+
+define void @__user_init_bar(%bar* %0) {
+entry:
+  %self = alloca %bar*, align 8
+  store %bar* %0, %bar** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  %deref = load %foo*, %foo** %self, align 8
+  %bar_inst = getelementptr inbounds %foo, %foo* %deref, i32 0, i32 0
+  call void @__user_init_bar(%bar* %bar_inst)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -89,6 +117,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -99,3 +128,5 @@ declare void @prg(%prg*)
 declare void @foo(%foo*)
 
 declare void @bar(%bar*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_call_with_same_name_as_return_type.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_call_with_same_name_as_return_type.snap
index 40a7722e6b..44d7b0be91 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_call_with_same_name_as_return_type.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_call_with_same_name_as_return_type.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -37,6 +38,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -48,9 +56,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_called_in_program.snap
index 4c57819176..ec34bcab0f 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -40,6 +41,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -51,9 +59,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_called_when_shadowed.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_called_when_shadowed.snap
index 0372c09e73..41070a2bce 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_called_when_shadowed.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_called_when_shadowed.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -40,6 +41,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -51,9 +59,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_local_temp_var_initialization.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_local_temp_var_initialization.snap
index 0927531a4d..2bb97853bb 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_local_temp_var_initialization.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_local_temp_var_initialization.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -50,6 +51,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -61,9 +69,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_local_var_initialization_and_call.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_local_var_initialization_and_call.snap
index 644d81885e..b1cc1489ff 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_local_var_initialization_and_call.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_local_var_initialization_and_call.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -46,6 +47,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -57,9 +65,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_parameters_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_parameters_called_in_program.snap
index 25caa69751..3cd2ea84ef 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_parameters_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_parameters_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -42,6 +43,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -53,9 +61,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_two_parameters_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_two_parameters_called_in_program.snap
index 5c95d36e23..96a157d6f7 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_two_parameters_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__function_with_two_parameters_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -44,6 +45,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -55,9 +63,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__global_variable_reference_is_generated.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__global_variable_reference_is_generated.snap
index 62601a1560..ae3a94d152 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__global_variable_reference_is_generated.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__global_variable_reference_is_generated.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: function
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,6 +34,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -44,9 +52,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_elsif_else_generator_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_elsif_else_generator_test.snap
index 73cc1c0012..8d108a8fab 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_elsif_else_generator_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_elsif_else_generator_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -66,6 +67,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -77,9 +85,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_generator_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_generator_test.snap
index 40b084b3c3..486ea133ec 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_generator_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_generator_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -39,6 +40,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -50,9 +58,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_with_expression_generator_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_with_expression_generator_test.snap
index 66a4922ecb..bd03d9e35c 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_with_expression_generator_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__if_with_expression_generator_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -52,6 +53,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -63,9 +71,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__inlined_array_size_from_local_scoped_constants.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__inlined_array_size_from_local_scoped_constants.snap
index b757ca1e24..9abf9f26c8 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__inlined_array_size_from_local_scoped_constants.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__inlined_array_size_from_local_scoped_constants.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @aaa(%aaa*)
+
+define void @__user_init_aaa(%aaa* %0) {
+entry:
+  %self = alloca %aaa*, align 8
+  store %aaa* %0, %aaa** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_aaa(%aaa* @aaa_instance)
+  call void @__user_init_aaa(%aaa* @aaa_instance)
   ret void
 }
 
 declare void @__init_aaa(%aaa*)
 
 declare void @aaa(%aaa*)
+
+declare void @__user_init_aaa(%aaa*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_initialized_input.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_initialized_input.snap
index 9f66db8be5..1dec2c3697 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_initialized_input.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_initialized_input.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: prg
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -48,6 +49,13 @@ entry:
 }
 
 declare void @fb(%fb*)
+
+define void @__user_init_fb(%fb* %0) {
+entry:
+  %self = alloca %fb*, align 8
+  store %fb* %0, %fb** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_multiple_input.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_multiple_input.snap
index d688e238ce..740b3208aa 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_multiple_input.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_multiple_input.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: prg
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -46,6 +47,13 @@ entry:
 }
 
 declare void @fb(%fb*)
+
+define void @__user_init_fb(%fb* %0) {
+entry:
+  %self = alloca %fb*, align 8
+  store %fb* %0, %fb** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_with_aggregate_return_type.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_with_aggregate_return_type.snap
index 5c1fc0fdf8..36d3c29116 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_with_aggregate_return_type.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_with_aggregate_return_type.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: res
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -67,6 +68,13 @@ entry:
 }
 
 declare void @fb_with_method(%fb_with_method*)
+
+define void @__user_init_fb_with_method(%fb_with_method* %0) {
+entry:
+  %self = alloca %fb_with_method*, align 8
+  store %fb_with_method* %0, %fb_with_method** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__methods_var_output.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__methods_var_output.snap
index 5cf1b961bc..0ebf2e1e16 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__methods_var_output.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__methods_var_output.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: res
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -34,6 +35,7 @@ entry:
   %1 = bitcast %foo* %fb to i8*
   call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %1, i8* align 1 bitcast (%foo* @__foo__init to i8*), i64 ptrtoint (%foo* getelementptr (%foo, %foo* null, i32 1) to i64), i1 false)
   call void @__init_foo(%foo* %fb)
+  call void @__user_init_foo(%foo* %fb)
   %2 = bitcast [81 x i8]* %s to i8*
   call void @foo.baz(%foo* %fb, i8* %2)
   %3 = bitcast [81 x i8]* %s to i8*
@@ -43,6 +45,8 @@ entry:
 
 declare void @__init_foo(%foo*)
 
+declare void @__user_init_foo(%foo*)
+
 ; Function Attrs: argmemonly nofree nounwind willreturn
 declare void @llvm.memcpy.p0i8.p0i8.i32(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i32, i1 immarg) #0
 
@@ -69,6 +73,13 @@ entry:
 }
 
 declare void @foo(%foo*)
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__min_max_real_and_lreal_values_do_not_result_in_an_under_or_overflow.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__min_max_real_and_lreal_values_do_not_result_in_an_under_or_overflow.snap
index e8abcc9bd4..e5dc0486e5 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__min_max_real_and_lreal_values_do_not_result_in_an_under_or_overflow.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__min_max_real_and_lreal_values_do_not_result_in_an_under_or_overflow.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -32,6 +33,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -43,9 +51,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__multidim_array_access.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__multidim_array_access.snap
index e62c881bc5..7d89b72a40 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__multidim_array_access.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__multidim_array_access.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__multidim_array_declaration.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__multidim_array_declaration.snap
index 7e344969e8..22af986c4a 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__multidim_array_declaration.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__multidim_array_declaration.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -29,6 +30,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -40,9 +48,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_access.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_access.snap
index 4c5e33c302..73c3aa6a29 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_access.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_access.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -39,6 +40,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -50,9 +58,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_cube_writes.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_cube_writes.snap
index 95c33ec5f5..f2431c6f9e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_cube_writes.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_cube_writes.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -54,6 +55,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -65,9 +73,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_cube_writes_negative_start.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_cube_writes_negative_start.snap
index 73b4b45ecf..402e97652f 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_cube_writes_negative_start.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_cube_writes_negative_start.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -57,6 +58,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -68,9 +76,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_declaration.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_declaration.snap
index 272772c31a..6a785f4b0e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_declaration.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_array_declaration.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -29,6 +30,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -40,9 +48,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_function_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_function_called_in_program.snap
index deb6a136ce..4f2ca35ec0 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_function_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__nested_function_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -52,6 +53,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -63,9 +71,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__order_var_and_var_temp_block.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__order_var_and_var_temp_block.snap
index 8af2e82023..3e1e40ed8d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__order_var_and_var_temp_block.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__order_var_and_var_temp_block.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__pass_inout_to_inout.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__pass_inout_to_inout.snap
index 9050977673..cb8d698f48 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__pass_inout_to_inout.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__pass_inout_to_inout.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -76,6 +77,27 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo2(%foo2* %0) {
+entry:
+  %self = alloca %foo2*, align 8
+  store %foo2* %0, %foo2** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -93,6 +115,9 @@ entry:
   call void @__init_foo(%foo* @foo_instance)
   call void @__init_foo2(%foo2* @foo2_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
+  call void @__user_init_foo2(%foo2* @foo2_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -107,3 +132,9 @@ declare void @foo2(%foo2*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_foo(%foo*)
+
+declare void @__user_init_foo2(%foo2*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__pointers_generated.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__pointers_generated.snap
index cecdbdd192..b881d82d41 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__pointers_generated.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__pointers_generated.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -47,6 +48,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -58,9 +66,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_called_in_program.snap
index c24e79b34e..3e6f7142e0 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -47,6 +48,20 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -61,6 +76,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_foo(%foo* @foo_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -71,3 +88,7 @@ declare void @foo(%foo*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_foo(%foo*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_and_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_and_statement.snap
index 0d7bb7edf6..cf7a0af7cf 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_and_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_and_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -41,6 +42,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -52,9 +60,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_bool_variables_and_references_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_bool_variables_and_references_generates_void_function_and_struct_and_body.snap
index d59bfa4442..8396fad699 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_bool_variables_and_references_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_bool_variables_and_references_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -32,6 +33,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -43,9 +51,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_boolean_assignment_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_boolean_assignment_generates_void_function_and_struct_and_body.snap
index 1b0a4d043f..375897ba01 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_boolean_assignment_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_boolean_assignment_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_casted_chars_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_casted_chars_assignment.snap
index f8eb6b2156..ea9360b654 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_casted_chars_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_casted_chars_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -34,6 +35,13 @@ entry:
 }
 
 declare void @mainPROG(%mainPROG*)
+
+define void @__user_init_mainPROG(%mainPROG* %0) {
+entry:
+  %self = alloca %mainPROG*, align 8
+  store %mainPROG* %0, %mainPROG** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -45,9 +53,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_mainprog(%mainPROG* @mainPROG_instance)
+  call void @__user_init_mainPROG(%mainPROG* @mainPROG_instance)
   ret void
 }
 
 declare void @__init_mainprog(%mainPROG*)
 
 declare void @mainPROG(%mainPROG*)
+
+declare void @__user_init_mainPROG(%mainPROG*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_chars.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_chars.snap
index 7ee6a379bc..00e69f37a5 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_chars.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_chars.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -42,6 +43,13 @@ entry:
 }
 
 declare void @mainPROG(%mainPROG*)
+
+define void @__user_init_mainPROG(%mainPROG* %0) {
+entry:
+  %self = alloca %mainPROG*, align 8
+  store %mainPROG* %0, %mainPROG** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -53,9 +61,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_mainprog(%mainPROG* @mainPROG_instance)
+  call void @__user_init_mainPROG(%mainPROG* @mainPROG_instance)
   ret void
 }
 
 declare void @__init_mainprog(%mainPROG*)
 
 declare void @mainPROG(%mainPROG*)
+
+declare void @__user_init_mainPROG(%mainPROG*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_date_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_date_assignment.snap
index 78fd8eedec..689adec2eb 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_date_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_date_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -44,6 +45,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -55,9 +63,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_date_assignment_whit_short_datatype_names.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_date_assignment_whit_short_datatype_names.snap
index 2dfff211da..918747cf66 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_date_assignment_whit_short_datatype_names.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_date_assignment_whit_short_datatype_names.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -41,6 +42,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -52,9 +60,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_floats_variable_and_comparison_assignment_generates_correctly.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_floats_variable_and_comparison_assignment_generates_correctly.snap
index 5045d9b99a..a4627ffec5 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_floats_variable_and_comparison_assignment_generates_correctly.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_floats_variable_and_comparison_assignment_generates_correctly.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -54,6 +55,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -65,9 +73,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_local_temp_var_initialization.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_local_temp_var_initialization.snap
index 64b2835d1b..fe2282f109 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_local_temp_var_initialization.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_local_temp_var_initialization.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -57,6 +58,20 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -71,6 +86,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_foo(%foo* @foo_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -81,3 +98,7 @@ declare void @foo(%foo*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_foo(%foo*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_long_date_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_long_date_assignment.snap
index 136055a64a..4e035a25cd 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_long_date_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_long_date_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -40,6 +41,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -51,9 +59,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_negated_combined_expressions_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_negated_combined_expressions_generates_void_function_and_struct_and_body.snap
index 97cd368156..dcd58febc6 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_negated_combined_expressions_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_negated_combined_expressions_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -53,6 +54,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -64,9 +72,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_negated_expressions_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_negated_expressions_generates_void_function_and_struct_and_body.snap
index 7b5f0c5a46..6256606de3 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_negated_expressions_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_negated_expressions_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -45,6 +46,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -56,9 +64,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_or_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_or_statement.snap
index 0afd521fa4..2c3a842091 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_or_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_or_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -41,6 +42,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -52,9 +60,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_additions.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_additions.snap
index 189cb51e27..fe50184882 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_additions.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_additions.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -37,6 +38,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -48,9 +56,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_assignment.snap
index f58a8a897b..8ebc7adc92 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -32,6 +33,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -43,9 +51,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_cast_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_cast_assignment.snap
index ea343b4f19..d2db3c76b7 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_cast_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_real_cast_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,6 +34,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -44,9 +52,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_signed_combined_expressions.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_signed_combined_expressions.snap
index 7e3a0379ff..9c8162e064 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_signed_combined_expressions.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_signed_combined_expressions.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -38,6 +39,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -49,9 +57,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_special_chars_in_string.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_special_chars_in_string.snap
index 3f3fcd0e06..80f9cdc5eb 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_special_chars_in_string.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_special_chars_in_string.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -49,6 +50,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -60,9 +68,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_string_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_string_assignment.snap
index 1eb04fc7cf..628377de15 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_string_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_string_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -41,6 +42,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -52,9 +60,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_time_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_time_assignment.snap
index 4aeeffbcba..fa3b0dd897 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_time_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_time_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -38,6 +39,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -49,9 +57,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_time_of_day_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_time_of_day_assignment.snap
index e2f273088b..ed1d821555 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_time_of_day_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_time_of_day_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -37,6 +38,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -48,9 +56,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_two_explicit_parameters_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_two_explicit_parameters_called_in_program.snap
index 1d697f5da9..7d8dc8336d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_two_explicit_parameters_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_two_explicit_parameters_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -51,6 +52,20 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -65,6 +80,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_foo(%foo* @foo_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -75,3 +92,7 @@ declare void @foo(%foo*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_foo(%foo*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_two_parameters_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_two_parameters_called_in_program.snap
index eacc8f2237..b29faaac51 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_two_parameters_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_two_parameters_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -51,6 +52,20 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -65,6 +80,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_foo(%foo* @foo_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -75,3 +92,7 @@ declare void @foo(%foo*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_foo(%foo*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_inout_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_inout_called_in_program.snap
index 0eaee4edc1..0afee40f87 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_inout_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_inout_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -56,6 +57,20 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -70,6 +85,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_foo(%foo* @foo_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -80,3 +97,7 @@ declare void @foo(%foo*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_foo(%foo*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_out_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_out_called_in_program.snap
index 5c9a7a09e3..0736f7c57c 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_out_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_out_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -53,6 +54,20 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -67,6 +82,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_foo(%foo* @foo_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -77,3 +94,7 @@ declare void @foo(%foo*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_foo(%foo*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_out_called_mixed_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_out_called_mixed_in_program.snap
index 5c9a7a09e3..0736f7c57c 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_out_called_mixed_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_var_out_called_mixed_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -53,6 +54,20 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -67,6 +82,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_foo(%foo* @foo_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -77,3 +94,7 @@ declare void @foo(%foo*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_foo(%foo*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_addition_literal_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_addition_literal_generates_void_function_and_struct_and_body.snap
index 45c96acc5b..c3ed35ed55 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_addition_literal_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_addition_literal_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_arithmatic_assignment_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_arithmatic_assignment_generates_void_function_and_struct_and_body.snap
index f0cc216765..2171d1ad43 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_arithmatic_assignment_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_arithmatic_assignment_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -45,6 +46,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -56,9 +64,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_comparison_assignment_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_comparison_assignment_generates_void_function_and_struct_and_body.snap
index 12d44faa14..9d13b1e5cd 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_comparison_assignment_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_and_comparison_assignment_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -54,6 +55,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -65,9 +73,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_assignment_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_assignment_generates_void_function_and_struct_and_body.snap
index 9777abe7ad..c30526b4f3 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_assignment_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variable_assignment_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -30,6 +31,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -41,9 +49,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_and_additions_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_and_additions_generates_void_function_and_struct_and_body.snap
index 18736c9ab9..4fd9a39e58 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_and_additions_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_and_additions_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,6 +34,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -44,9 +52,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_and_references_generates_void_function_and_struct_and_body.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_and_references_generates_void_function_and_struct_and_body.snap
index 4ff968b283..403f3fca07 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_and_references_generates_void_function_and_struct_and_body.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_and_references_generates_void_function_and_struct_and_body.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -32,6 +33,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -43,9 +51,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_generates_void_function_and_struct.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_generates_void_function_and_struct.snap
index 1d5ccb0992..65bb6a3f97 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_generates_void_function_and_struct.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_variables_generates_void_function_and_struct.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -30,6 +31,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -41,9 +49,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_xor_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_xor_statement.snap
index 43be1ce929..890ce133b5 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_xor_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__program_with_xor_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -38,6 +39,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -49,9 +57,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_action_from_fb_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_action_from_fb_called_in_program.snap
index 17ae0ca3e5..e96a6099fe 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_action_from_fb_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_action_from_fb_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -59,6 +60,23 @@ entry:
   store %fb* %0, %fb** %self, align 8
   ret void
 }
+
+define void @__user_init_fb(%fb* %0) {
+entry:
+  %self = alloca %fb*, align 8
+  store %fb* %0, %fb** %self, align 8
+  ret void
+}
+
+define void @__user_init_bar(%bar* %0) {
+entry:
+  %self = alloca %bar*, align 8
+  store %bar* %0, %bar** %self, align 8
+  %deref = load %bar*, %bar** %self, align 8
+  %fb_inst = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+  call void @__user_init_fb(%fb* %fb_inst)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -72,6 +90,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_bar(%bar* @bar_instance)
+  call void @__user_init_bar(%bar* @bar_instance)
   ret void
 }
 
@@ -80,3 +99,5 @@ declare void @__init_bar(%bar*)
 declare void @bar(%bar*)
 
 declare void @fb(%fb*)
+
+declare void @__user_init_bar(%bar*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_foreign_action_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_foreign_action_called_in_program.snap
index 3a290a7ea8..e10189d8ad 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_foreign_action_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_foreign_action_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -55,6 +56,20 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_bar(%bar* %0) {
+entry:
+  %self = alloca %bar*, align 8
+  store %bar* %0, %bar** %self, align 8
+  ret void
+}
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -69,6 +84,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_bar(%bar* @bar_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_bar(%bar* @bar_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -79,3 +96,7 @@ declare void @bar(%bar*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_bar(%bar*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_local_action_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_local_action_called_in_program.snap
index abe2689e48..fde1fd48af 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_local_action_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_local_action_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -37,6 +38,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -48,9 +56,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__real_function_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__real_function_called_in_program.snap
index f829a9c168..8610e1a92e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__real_function_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__real_function_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -41,6 +42,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -52,9 +60,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__reference_qualified_name.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__reference_qualified_name.snap
index e0a5e333f8..71d9430800 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__reference_qualified_name.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__reference_qualified_name.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -78,6 +79,30 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_fb(%fb* %0) {
+entry:
+  %self = alloca %fb*, align 8
+  store %fb* %0, %fb** %self, align 8
+  ret void
+}
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
+
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  %deref = load %foo*, %foo** %self, align 8
+  %baz = getelementptr inbounds %foo, %foo* %deref, i32 0, i32 2
+  call void @__user_init_fb(%fb* %baz)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -94,6 +119,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_foo(%foo* @foo_instance)
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
@@ -106,3 +133,7 @@ declare void @fb(%fb*)
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_foo(%foo*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__reference_to_reference_assignments_in_function_arguments.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__reference_to_reference_assignments_in_function_arguments.snap
index 3c678bb259..6276912ea3 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__reference_to_reference_assignments_in_function_arguments.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__reference_to_reference_assignments_in_function_arguments.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -71,6 +72,20 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -93,6 +108,8 @@ entry:
   call void @__init_struct_params(%STRUCT_params* @global1)
   call void @__init_struct_params(%STRUCT_params* @global2)
   call void @__init_struct_params(%STRUCT_params* @global3)
+  call void @__user_init_prog(%prog* @prog_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -105,3 +122,7 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @__init_struct_params(%STRUCT_params*)
+
+declare void @__user_init_prog(%prog*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__repeat_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__repeat_statement.snap
index dbfe56f06b..6620662aa1 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__repeat_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__repeat_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -50,6 +51,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -61,9 +69,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__returning_early_in_function_block.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__returning_early_in_function_block.snap
index 55c3a36b3f..725b563e06 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__returning_early_in_function_block.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__returning_early_in_function_block.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @abcdef(%abcdef*)
+
+define void @__user_init_abcdef(%abcdef* %0) {
+entry:
+  %self = alloca %abcdef*, align 8
+  store %abcdef* %0, %abcdef** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__simple_case_i8_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__simple_case_i8_statement.snap
index f6b96e6f98..d571880dbb 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__simple_case_i8_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__simple_case_i8_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -54,6 +55,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -65,9 +73,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__simple_case_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__simple_case_statement.snap
index 8847e78672..a861cbed57 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__simple_case_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__simple_case_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -54,6 +55,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -65,9 +73,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__structs_members_can_be_referenced.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__structs_members_can_be_referenced.snap
index d508516746..91c38553d2 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__structs_members_can_be_referenced.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__structs_members_can_be_referenced.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -45,6 +46,13 @@ entry:
 }
 
 declare void @MainProg(%MainProg*)
+
+define void @__user_init_MainProg(%MainProg* %0) {
+entry:
+  %self = alloca %MainProg*, align 8
+  store %MainProg* %0, %MainProg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -58,9 +66,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_mainprog(%MainProg* @MainProg_instance)
+  call void @__user_init_MainProg(%MainProg* @MainProg_instance)
   ret void
 }
 
 declare void @__init_mainprog(%MainProg*)
 
 declare void @MainProg(%MainProg*)
+
+declare void @__user_init_MainProg(%MainProg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_check_functions.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_check_functions.snap
index 29204eb817..1481bc2b75 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_check_functions.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_check_functions.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -124,6 +125,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -135,9 +143,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_type_calls_check_function_missing.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_type_calls_check_function_missing.snap
index a698d7f91d..8aaa44cb75 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_type_calls_check_function_missing.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_type_calls_check_function_missing.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -46,6 +47,13 @@ entry:
 }
 
 declare void @Main(%Main*)
+
+define void @__user_init_Main(%Main* %0) {
+entry:
+  %self = alloca %Main*, align 8
+  store %Main* %0, %Main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -57,9 +65,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%Main* @Main_instance)
+  call void @__user_init_Main(%Main* @Main_instance)
   ret void
 }
 
 declare void @__init_main(%Main*)
 
 declare void @Main(%Main*)
+
+declare void @__user_init_Main(%Main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_type_calls_check_function_on_assigment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_type_calls_check_function_on_assigment.snap
index ffbf28da6b..b38231c906 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_type_calls_check_function_on_assigment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__sub_range_type_calls_check_function_on_assigment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -47,6 +48,13 @@ entry:
 }
 
 declare void @Main(%Main*)
+
+define void @__user_init_Main(%Main* %0) {
+entry:
+  %self = alloca %Main*, align 8
+  store %Main* %0, %Main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -58,9 +66,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%Main* @Main_instance)
+  call void @__user_init_Main(%Main* @Main_instance)
   ret void
 }
 
 declare void @__init_main(%Main*)
 
 declare void @Main(%Main*)
+
+declare void @__user_init_Main(%Main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__time_variables_have_nano_seconds_resolution.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__time_variables_have_nano_seconds_resolution.snap
index 0e2ae3e0ad..9230e743c1 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__time_variables_have_nano_seconds_resolution.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__time_variables_have_nano_seconds_resolution.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,6 +34,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -44,9 +52,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__two_global_variables_generates_in_separate_global_variables.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__two_global_variables_generates_in_separate_global_variables.snap
index a3ced4bece..6166c62978 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__two_global_variables_generates_in_separate_global_variables.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__two_global_variables_generates_in_separate_global_variables.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__typed_enums_are_used_properly.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__typed_enums_are_used_properly.snap
index 517f6d299d..6ba94a0ee4 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__typed_enums_are_used_properly.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__typed_enums_are_used_properly.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -54,9 +62,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_cast_statement_as_const_expression.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_cast_statement_as_const_expression.snap
index 29553d5349..1b8b14adb6 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_cast_statement_as_const_expression.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_cast_statement_as_const_expression.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -29,6 +30,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -40,9 +48,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_const_expression_in_range_type.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_const_expression_in_range_type.snap
index a3d63b4c24..df6f3ac0e6 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_const_expression_in_range_type.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_const_expression_in_range_type.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -53,6 +54,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -64,9 +72,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_global_consts_in_expressions.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_global_consts_in_expressions.snap
index 701504f3c7..6ba61539ee 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_global_consts_in_expressions.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__using_global_consts_in_expressions.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,6 +34,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -44,9 +52,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__variable_with_same_name_as_data_type.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__variable_with_same_name_as_data_type.snap
index 7599213219..cc246c7ce0 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__variable_with_same_name_as_data_type.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__variable_with_same_name_as_data_type.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -39,6 +40,13 @@ entry:
 }
 
 declare void @prog(%prog*)
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -50,9 +58,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
   ret void
 }
 
 declare void @__init_prog(%prog*)
 
 declare void @prog(%prog*)
+
+declare void @__user_init_prog(%prog*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_loop_with_if_exit.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_loop_with_if_exit.snap
index 262889e107..8fad410879 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_loop_with_if_exit.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_loop_with_if_exit.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -68,6 +69,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -79,9 +87,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_statement.snap
index e63b494d61..9f4bcc30eb 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -51,6 +52,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -62,9 +70,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_with_expression_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_with_expression_statement.snap
index 2ff52b115a..486da45e9e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_with_expression_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__while_with_expression_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/code_gen_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -54,6 +55,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -65,9 +73,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_datetime_types.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_datetime_types.snap
index 038eb460c0..8789a68b5d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_datetime_types.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_datetime_types.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/compare_instructions_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -56,6 +57,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -67,9 +75,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_instruction_functions_with_different_types.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_instruction_functions_with_different_types.snap
index b6f60e83e2..d4d9a69611 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_instruction_functions_with_different_types.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_instruction_functions_with_different_types.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/compare_instructions_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -140,6 +141,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -151,9 +159,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_instructions_with_different_types.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_instructions_with_different_types.snap
index 8f4a2234d4..ab053d3ec0 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_instructions_with_different_types.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__compare_instructions_with_different_types.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/compare_instructions_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -113,6 +114,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -124,9 +132,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__pointer_compare_instructions.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__pointer_compare_instructions.snap
index 7e862ef412..6cda5d31b2 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__pointer_compare_instructions.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__pointer_compare_instructions.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/compare_instructions_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -75,6 +76,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -86,9 +94,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__pointer_function_call_compare_instructions.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__pointer_function_call_compare_instructions.snap
index 167ad36180..dca3eb9322 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__pointer_function_call_compare_instructions.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__compare_instructions_tests__pointer_function_call_compare_instructions.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/compare_instructions_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -76,6 +77,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -87,9 +95,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_array_variable.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_array_variable.snap
index cea1c68713..1628950493 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_array_variable.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_array_variable.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/constants_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -37,6 +38,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -48,9 +56,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_string_variable.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_string_variable.snap
index 20d72ce4ff..8f5852e782 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_string_variable.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_string_variable.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/constants_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -37,6 +38,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -48,9 +56,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_struct_variable.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_struct_variable.snap
index a1e584b7ab..d2deffda12 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_struct_variable.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__constants_tests__assigning_const_struct_variable.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/constants_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -51,6 +52,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -66,6 +74,7 @@ define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
   call void @__init_point(%Point* @const_strct)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -74,3 +83,5 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @__init_point(%Point*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__access_string_via_byte_array.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__access_string_via_byte_array.snap
index a9ba5a7c94..b5b01023cc 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__access_string_via_byte_array.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__access_string_via_byte_array.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @baz(%baz*)
+
+define void @__user_init_baz(%baz* %0) {
+entry:
+  %self = alloca %baz*, align 8
+  store %baz* %0, %baz** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_baz(%baz* @baz_instance)
+  call void @__user_init_baz(%baz* @baz_instance)
   ret void
 }
 
 declare void @__init_baz(%baz*)
 
 declare void @baz(%baz*)
+
+declare void @__user_init_baz(%baz*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__allowed_assignable_types.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__allowed_assignable_types.snap
index 4fcbe1f8c8..4b4ba0237b 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__allowed_assignable_types.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__allowed_assignable_types.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -51,6 +52,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -62,9 +70,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_adr.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_adr.snap
index a1048bc146..af5a2f50a6 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_adr.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_adr.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_lower_bound.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_lower_bound.snap
index 835d8ceb58..4893817b21 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_lower_bound.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_lower_bound.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -59,6 +60,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -70,9 +78,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_move.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_move.snap
index f6227f3a85..d91feb07e2 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_move.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_move.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -32,6 +33,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -43,9 +51,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_mux.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_mux.snap
index 87304cbcf3..d43c7a31ef 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_mux.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_mux.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -64,6 +65,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -75,9 +83,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_mux_with_aggregate_type.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_mux_with_aggregate_type.snap
index 6e0ddff6e0..ff916ed6b7 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_mux_with_aggregate_type.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_mux_with_aggregate_type.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -70,6 +71,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -81,9 +89,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_ref.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_ref.snap
index a1048bc146..af5a2f50a6 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_ref.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_ref.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sel.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sel.snap
index f479774957..96d88ff4fc 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sel.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sel.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sel_as_expression.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sel_as_expression.snap
index 669afbbaa2..81cbc3d386 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sel_as_expression.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sel_as_expression.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sizeof.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sizeof.snap
index e6f6c1540d..769949624b 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sizeof.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_sizeof.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -31,6 +32,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -42,9 +50,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_upper_bound.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_upper_bound.snap
index 166561e6ce..cb35f20822 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_upper_bound.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_upper_bound.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -59,6 +60,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -70,9 +78,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_upper_bound_expr.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_upper_bound_expr.snap
index 5e57ceb0e9..e3bcc8f1c0 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_upper_bound_expr.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__builtin_function_call_upper_bound_expr.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -60,6 +61,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -71,9 +79,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__calling_strings_in_function_return.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__calling_strings_in_function_return.snap
index 598a06db87..827ca595b9 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__calling_strings_in_function_return.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__calling_strings_in_function_return.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -56,6 +57,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -67,9 +75,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__cast_between_pointer_types.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__cast_between_pointer_types.snap
index 9daa6a1df2..09da05303f 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__cast_between_pointer_types.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__cast_between_pointer_types.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -32,6 +33,13 @@ entry:
 }
 
 declare void @baz(%baz*)
+
+define void @__user_init_baz(%baz* %0) {
+entry:
+  %self = alloca %baz*, align 8
+  store %baz* %0, %baz** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -43,9 +51,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_baz(%baz* @baz_instance)
+  call void @__user_init_baz(%baz* @baz_instance)
   ret void
 }
 
 declare void @__init_baz(%baz*)
 
 declare void @baz(%baz*)
+
+declare void @__user_init_baz(%baz*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__compare_date_time_literals.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__compare_date_time_literals.snap
index 70890ecfed..6ee195c999 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__compare_date_time_literals.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__compare_date_time_literals.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -52,6 +53,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -63,9 +71,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__nested_call_statements.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__nested_call_statements.snap
index 5537bf46b1..83fca4dd0d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__nested_call_statements.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__nested_call_statements.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -40,6 +41,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -51,9 +59,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__pointer_arithmetics.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__pointer_arithmetics.snap
index 2795a237c2..c03ecb1609 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__pointer_arithmetics.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__pointer_arithmetics.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -75,6 +76,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -86,9 +94,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__pointer_arithmetics_function_call.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__pointer_arithmetics_function_call.snap
index 4020475e02..9f20918275 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__pointer_arithmetics_function_call.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__pointer_arithmetics_function_call.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -54,9 +62,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__unary_expressions_can_be_real.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__unary_expressions_can_be_real.snap
index 4824e1e8ed..7ca03785b5 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__unary_expressions_can_be_real.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__unary_expressions_can_be_real.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -34,6 +35,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -45,9 +53,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__unnecessary_casts_between_pointer_types.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__unnecessary_casts_between_pointer_types.snap
index 9d05dc2163..e0bc2bfc03 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__unnecessary_casts_between_pointer_types.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__expression_tests__unnecessary_casts_between_pointer_types.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/expression_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @baz(%baz*)
+
+define void @__user_init_baz(%baz* %0) {
+entry:
+  %self = alloca %baz*, align 8
+  store %baz* %0, %baz** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_baz(%baz* @baz_instance)
+  call void @__user_init_baz(%baz* @baz_instance)
   ret void
 }
 
 declare void @__init_baz(%baz*)
 
 declare void @baz(%baz*)
+
+declare void @__user_init_baz(%baz*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__autocast_argument_literals_for_function_call.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__autocast_argument_literals_for_function_call.snap
index 1c8dce0b77..b14c7cd173 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__autocast_argument_literals_for_function_call.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__autocast_argument_literals_for_function_call.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -62,6 +63,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -73,9 +81,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__bitcast_argument_references_for_function_call.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__bitcast_argument_references_for_function_call.snap
index 50ad7bbab5..0fe3d3655d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__bitcast_argument_references_for_function_call.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__bitcast_argument_references_for_function_call.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -116,6 +117,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -127,9 +135,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_ref_sized_string_varargs_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_ref_sized_string_varargs_called_in_program.snap
index 8f6bcb6981..165c5c2476 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_ref_sized_string_varargs_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_ref_sized_string_varargs_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -44,6 +45,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -55,9 +63,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_sized_varargs_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_sized_varargs_called_in_program.snap
index 5f8a9d48e5..4ccbc835b5 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_sized_varargs_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_sized_varargs_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -54,9 +62,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_varargs_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_varargs_called_in_program.snap
index c3d9a51a8d..47c576efd0 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_varargs_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__function_with_varargs_called_in_program.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__literal_string_argument_passed_by_ref.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__literal_string_argument_passed_by_ref.snap
index b9255433f1..4ec2795500 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__literal_string_argument_passed_by_ref.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__literal_string_argument_passed_by_ref.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -49,6 +50,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -60,9 +68,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_a_string_to_a_function.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_a_string_to_a_function.snap
index ade06cd119..ff37ff7fd7 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_a_string_to_a_function.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_a_string_to_a_function.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -54,6 +55,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -65,9 +73,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_a_string_to_a_function_as_reference.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_a_string_to_a_function_as_reference.snap
index 473969fb17..3267dbae47 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_a_string_to_a_function_as_reference.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_a_string_to_a_function_as_reference.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -54,9 +62,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_arguments_to_functions_by_ref_and_val.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_arguments_to_functions_by_ref_and_val.snap
index d01b1be95f..990478a5b4 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_arguments_to_functions_by_ref_and_val.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__passing_arguments_to_functions_by_ref_and_val.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -62,6 +63,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -73,9 +81,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__simple_call.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__simple_call.snap
index c244959e71..0a35f33545 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__simple_call.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__simple_call.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -45,6 +46,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -56,9 +64,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__var_output_in_function_call.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__var_output_in_function_call.snap
index 42f6dc49e3..58f1e7806b 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__var_output_in_function_call.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__function_tests__var_output_in_function_call.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/function_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -54,9 +62,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__any_real_function_called_with_ints.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__any_real_function_called_with_ints.snap
index 8629627452..7670dc6050 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__any_real_function_called_with_ints.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__any_real_function_called_with_ints.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/generics_test.rs
 expression: codegen(src)
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -72,6 +73,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -83,9 +91,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__generic_function_call_generates_real_type_call.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__generic_function_call_generates_real_type_call.snap
index 8c8a6bae82..01d99fd685 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__generic_function_call_generates_real_type_call.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__generic_function_call_generates_real_type_call.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/generics_test.rs
 expression: prg
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -48,6 +49,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__generic_output_parameter.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__generic_output_parameter.snap
index 480da20fc3..c38e9fd547 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__generic_output_parameter.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__generics_test__generic_output_parameter.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/generics_test.rs
 expression: codegen(src)
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -46,6 +47,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -57,9 +65,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__fb_accepts_empty_statement_as_input_param.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__fb_accepts_empty_statement_as_input_param.snap
index 639f5888b0..256830ddc3 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__fb_accepts_empty_statement_as_input_param.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__fb_accepts_empty_statement_as_input_param.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -55,6 +56,23 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_fb_t(%fb_t* %0) {
+entry:
+  %self = alloca %fb_t*, align 8
+  store %fb_t* %0, %fb_t** %self, align 8
+  ret void
+}
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  %deref = load %main*, %main** %self, align 8
+  %fb = getelementptr inbounds %main, %main* %deref, i32 0, i32 0
+  call void @__user_init_fb_t(%fb_t* %fb)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -68,6 +86,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -76,3 +95,5 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @fb_t(%fb_t*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__fb_accepts_empty_statement_as_output_param.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__fb_accepts_empty_statement_as_output_param.snap
index 3577d0e498..be1d364946 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__fb_accepts_empty_statement_as_output_param.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__fb_accepts_empty_statement_as_output_param.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -57,6 +58,23 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_fb_t(%fb_t* %0) {
+entry:
+  %self = alloca %fb_t*, align 8
+  store %fb_t* %0, %fb_t** %self, align 8
+  ret void
+}
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  %deref = load %main*, %main** %self, align 8
+  %fb = getelementptr inbounds %main, %main* %deref, i32 0, i32 0
+  call void @__user_init_fb_t(%fb_t* %fb)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -70,6 +88,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -78,3 +97,5 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @fb_t(%fb_t*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_accepts_empty_statement_as_input_param.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_accepts_empty_statement_as_input_param.snap
index cdc830a805..0da53e4baa 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_accepts_empty_statement_as_input_param.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_accepts_empty_statement_as_input_param.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -40,6 +41,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -51,9 +59,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_accepts_empty_statement_as_output_param.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_accepts_empty_statement_as_output_param.snap
index 139d425819..9ff6069f66 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_accepts_empty_statement_as_output_param.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_accepts_empty_statement_as_output_param.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -40,6 +41,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -51,9 +59,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_all_parameters_assigned.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_all_parameters_assigned.snap
index 096a0ac698..5f02d24175 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_all_parameters_assigned.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_all_parameters_assigned.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -51,6 +52,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -62,9 +70,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_default_value_parameter_type.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_default_value_parameter_type.snap
index 4ef65cd182..0dc6d26536 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_default_value_parameter_type.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_default_value_parameter_type.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -52,6 +53,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -63,9 +71,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_inout_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_inout_assignment.snap
index 5cf23f7a47..40d33d38ec 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_inout_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_inout_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -48,6 +49,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_input_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_input_assignment.snap
index 2d0339b8fd..76be23e300 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_input_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_input_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -48,6 +49,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_output_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_output_assignment.snap
index 7be06e0bba..04e99fc1a4 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_output_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_output_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -48,6 +49,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_output_default_value_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_output_default_value_assignment.snap
index b06c2fce33..8c7ee11f2e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_output_default_value_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_empty_output_default_value_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -49,6 +50,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -60,9 +68,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_inout_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_inout_assignment.snap
index 5cf23f7a47..40d33d38ec 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_inout_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_inout_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -48,6 +49,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_input_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_input_assignment.snap
index 2d0339b8fd..76be23e300 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_input_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_input_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -48,6 +49,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_input_default_value_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_input_default_value_assignment.snap
index 727c78830f..618d2f612c 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_input_default_value_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_input_default_value_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -46,6 +47,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -57,9 +65,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_output_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_output_assignment.snap
index 7be06e0bba..04e99fc1a4 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_output_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_output_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -48,6 +49,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -59,9 +67,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_output_default_value_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_output_default_value_assignment.snap
index b06c2fce33..8c7ee11f2e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_output_default_value_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__function_missing_output_default_value_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -49,6 +50,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -60,9 +68,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__parameters_behind_function_block_pointer_are_assigned_to.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__parameters_behind_function_block_pointer_are_assigned_to.snap
index 53f32c6a82..cd00ea83e5 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__parameters_behind_function_block_pointer_are_assigned_to.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__parameters_behind_function_block_pointer_are_assigned_to.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -58,6 +59,23 @@ entry:
   store %file_t* %0, %file_t** %self, align 8
   ret void
 }
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  %deref = load %main*, %main** %self, align 8
+  %file = getelementptr inbounds %main, %main* %deref, i32 0, i32 0
+  call void @__user_init_file_t(%file_t* %file)
+  ret void
+}
+
+define void @__user_init_file_t(%file_t* %0) {
+entry:
+  %self = alloca %file_t*, align 8
+  store %file_t* %0, %file_t** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -71,6 +89,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -79,3 +98,5 @@ declare void @__init_main(%main*)
 declare void @main(%main*)
 
 declare void @file_t(%file_t*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_accepts_empty_statement_as_input_param.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_accepts_empty_statement_as_input_param.snap
index e20def74a4..2dd6488805 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_accepts_empty_statement_as_input_param.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_accepts_empty_statement_as_input_param.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -50,6 +51,20 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -64,6 +79,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -74,3 +91,7 @@ declare void @prog(%prog*)
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_prog(%prog*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_accepts_empty_statement_as_output_param.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_accepts_empty_statement_as_output_param.snap
index a34dd55524..290dfd9398 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_accepts_empty_statement_as_output_param.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_accepts_empty_statement_as_output_param.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -54,6 +55,20 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -68,6 +83,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -78,3 +95,7 @@ declare void @prog(%prog*)
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_prog(%prog*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_all_parameters_assigned_explicit.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_all_parameters_assigned_explicit.snap
index eb32d92c97..1111c5d2ae 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_all_parameters_assigned_explicit.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_all_parameters_assigned_explicit.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -64,6 +65,20 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -78,6 +93,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -88,3 +105,7 @@ declare void @prog(%prog*)
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_prog(%prog*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_all_parameters_assigned_implicit.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_all_parameters_assigned_implicit.snap
index a432cd7e33..b1e94b021d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_all_parameters_assigned_implicit.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_all_parameters_assigned_implicit.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -58,6 +59,20 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -72,6 +87,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -82,3 +99,7 @@ declare void @prog(%prog*)
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_prog(%prog*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_empty_inout_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_empty_inout_assignment.snap
index 14091daaea..b5d8ed4203 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_empty_inout_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_empty_inout_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -59,6 +60,20 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -73,6 +88,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -83,3 +100,7 @@ declare void @prog(%prog*)
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_prog(%prog*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_missing_input_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_missing_input_assignment.snap
index eb51ec2c19..e079281f09 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_missing_input_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_missing_input_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -56,6 +57,20 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -70,6 +85,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -80,3 +97,7 @@ declare void @prog(%prog*)
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_prog(%prog*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_missing_output_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_missing_output_assignment.snap
index b5e56bf85a..382203d840 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_missing_output_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__program_missing_output_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -56,6 +57,20 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -70,6 +85,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -80,3 +97,7 @@ declare void @prog(%prog*)
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_prog(%prog*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__var_in_out_params_can_be_out_of_order.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__var_in_out_params_can_be_out_of_order.snap
index 43bd8a7a32..23d75a7b73 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__var_in_out_params_can_be_out_of_order.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__var_in_out_params_can_be_out_of_order.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/parameters_tests.rs
 expression: res
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -87,6 +88,23 @@ entry:
   store %fb_t* %0, %fb_t** %self, align 8
   ret void
 }
+
+define void @__user_init_fb_t(%fb_t* %0) {
+entry:
+  %self = alloca %fb_t*, align 8
+  store %fb_t* %0, %fb_t** %self, align 8
+  ret void
+}
+
+define void @__user_init_mainProg(%mainProg* %0) {
+entry:
+  %self = alloca %mainProg*, align 8
+  store %mainProg* %0, %mainProg** %self, align 8
+  %deref = load %mainProg*, %mainProg** %self, align 8
+  %fb = getelementptr inbounds %mainProg, %mainProg* %deref, i32 0, i32 0
+  call void @__user_init_fb_t(%fb_t* %fb)
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -100,6 +118,7 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_mainprog(%mainProg* @mainProg_instance)
+  call void @__user_init_mainProg(%mainProg* @mainProg_instance)
   ret void
 }
 
@@ -108,3 +127,5 @@ declare void @__init_mainprog(%mainProg*)
 declare void @mainProg(%mainProg*)
 
 declare void @fb_t(%fb_t*)
+
+declare void @__user_init_mainProg(%mainProg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__bitaccess_generated_as_rsh_and_trunc_i1.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__bitaccess_generated_as_rsh_and_trunc_i1.snap
index 584e0c91fc..891ea521b1 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__bitaccess_generated_as_rsh_and_trunc_i1.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__bitaccess_generated_as_rsh_and_trunc_i1.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/statement_codegen_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -41,6 +42,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -52,9 +60,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__byteaccess_generated_as_rsh_and_trunc_i8.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__byteaccess_generated_as_rsh_and_trunc_i8.snap
index 0ad5ad012c..c08d49a466 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__byteaccess_generated_as_rsh_and_trunc_i8.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__byteaccess_generated_as_rsh_and_trunc_i8.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/statement_codegen_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -54,9 +62,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__dwordaccess_generated_as_rsh_and_trunc_i32.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__dwordaccess_generated_as_rsh_and_trunc_i32.snap
index 8953b537f5..fa2ae2cbaf 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__dwordaccess_generated_as_rsh_and_trunc_i32.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__dwordaccess_generated_as_rsh_and_trunc_i32.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/statement_codegen_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -54,9 +62,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__nested_bitwise_access.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__nested_bitwise_access.snap
index c9f5448c79..c199f7c838 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__nested_bitwise_access.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__nested_bitwise_access.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/statement_codegen_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -40,6 +41,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -51,9 +59,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__variable_based_bitwise_access.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__variable_based_bitwise_access.snap
index eea8a14643..74556c112b 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__variable_based_bitwise_access.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__variable_based_bitwise_access.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/statement_codegen_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -44,6 +45,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -55,9 +63,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__wordaccess_generated_as_rsh_and_trunc_i16.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__wordaccess_generated_as_rsh_and_trunc_i16.snap
index 7a3798978a..724f257511 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__wordaccess_generated_as_rsh_and_trunc_i16.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__statement_codegen_test__wordaccess_generated_as_rsh_and_trunc_i16.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/statement_codegen_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -54,9 +62,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__casted_string_assignment_uses_memcpy.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__casted_string_assignment_uses_memcpy.snap
index af6fd35b45..885dd09e5d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__casted_string_assignment_uses_memcpy.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__casted_string_assignment_uses_memcpy.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -45,6 +46,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -56,9 +64,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_returning_generic_string_should_return_by_ref.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_returning_generic_string_should_return_by_ref.snap
index c064df4504..635e499dc8 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_returning_generic_string_should_return_by_ref.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_returning_generic_string_should_return_by_ref.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -64,6 +65,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -75,9 +83,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_returns_a_literal_string.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_returns_a_literal_string.snap
index c0edc8b03d..fb8652a487 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_returns_a_literal_string.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_returns_a_literal_string.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: program
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -56,6 +57,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -67,9 +75,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_takes_string_paramter_and_returns_string.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_takes_string_paramter_and_returns_string.snap
index 08cb46914b..7c34766f55 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_takes_string_paramter_and_returns_string.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__function_takes_string_paramter_and_returns_string.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: program
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -64,6 +65,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -75,9 +83,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_string_output.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_string_output.snap
index e8599e5e16..a815eef505 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_string_output.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_string_output.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -66,6 +67,20 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
+define void @__user_init_prog(%prog* %0) {
+entry:
+  %self = alloca %prog*, align 8
+  store %prog* %0, %prog** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -80,6 +95,8 @@ define void @__init___testproject() {
 entry:
   call void @__init_prog(%prog* @prog_instance)
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_prog(%prog* @prog_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
@@ -90,3 +107,7 @@ declare void @prog(%prog*)
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_prog(%prog*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_with_casted_string_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_with_casted_string_assignment.snap
index 95c54d43f2..a3aff8bb1e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_with_casted_string_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_with_casted_string_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -43,6 +44,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -54,9 +62,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_with_string_type_assignment.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_with_string_type_assignment.snap
index fc3a460f1b..afbe9b33ad 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_with_string_type_assignment.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__program_with_string_type_assignment.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -49,6 +50,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -62,9 +70,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__string_function_parameters.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__string_function_parameters.snap
index 65b051e635..19d7fb55a7 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__string_function_parameters.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__string_function_parameters.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -68,6 +69,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -79,9 +87,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_length_strings_can_be_created.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_length_strings_can_be_created.snap
index 680951a731..7f29f36f37 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_length_strings_can_be_created.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_length_strings_can_be_created.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -45,6 +46,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -56,9 +64,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_length_strings_using_constants_can_be_created.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_length_strings_using_constants_can_be_created.snap
index 3f1ef99b4f..91dadd2f29 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_length_strings_using_constants_can_be_created.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_length_strings_using_constants_can_be_created.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -47,6 +48,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -58,9 +66,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_string_assignment_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_string_assignment_test.snap
index fb91c310d4..484524ca3f 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_string_assignment_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__variable_string_assignment_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -42,6 +43,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -53,9 +61,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__vartmp_string_init_test.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__vartmp_string_init_test.snap
index 1a54ad37a4..aea3b6cb93 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__vartmp_string_init_test.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__string_tests__vartmp_string_init_test.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/string_tests.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -44,6 +45,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -55,9 +63,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__aliased_datatypes_respect_conversion_rules.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__aliased_datatypes_respect_conversion_rules.snap
index e3ccbd97c6..30984edeea 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__aliased_datatypes_respect_conversion_rules.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__aliased_datatypes_respect_conversion_rules.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -41,6 +42,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -52,9 +60,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__datatypes_larger_than_int_promote_the_second_operand.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__datatypes_larger_than_int_promote_the_second_operand.snap
index a3e57d17d6..c56ddf1416 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__datatypes_larger_than_int_promote_the_second_operand.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__datatypes_larger_than_int_promote_the_second_operand.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__datatypes_smaller_than_dint_promoted_to_dint.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__datatypes_smaller_than_dint_promoted_to_dint.snap
index 77e3d58fad..34622c1a10 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__datatypes_smaller_than_dint_promoted_to_dint.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__datatypes_smaller_than_dint_promoted_to_dint.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__even_all_sint_expressions_fallback_to_dint.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__even_all_sint_expressions_fallback_to_dint.snap
index 50b6647616..752deac0c9 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__even_all_sint_expressions_fallback_to_dint.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__even_all_sint_expressions_fallback_to_dint.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -38,6 +39,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -49,9 +57,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_and_double_mix_converted_to_double.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_and_double_mix_converted_to_double.snap
index faf6c26e3e..2ff3806124 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_and_double_mix_converted_to_double.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_and_double_mix_converted_to_double.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_assigned_to_int_is_cast.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_assigned_to_int_is_cast.snap
index 9ea5503a2f..0b6715bcd4 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_assigned_to_int_is_cast.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_assigned_to_int_is_cast.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -37,6 +38,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -48,9 +56,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_assinged_to_double_to_double.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_assinged_to_double_to_double.snap
index d4fd023e43..7872cc2a09 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_assinged_to_double_to_double.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__float_assinged_to_double_to_double.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -33,6 +34,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -44,9 +52,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_assigned_to_float_is_cast.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_assigned_to_float_is_cast.snap
index a64a236985..174c5366df 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_assigned_to_float_is_cast.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_assigned_to_float_is_cast.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -37,6 +38,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -48,9 +56,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_bigger_than_byte_promoted_on_compare_statement.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_bigger_than_byte_promoted_on_compare_statement.snap
index 3d3d123a5f..a7532fa0a7 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_bigger_than_byte_promoted_on_compare_statement.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_bigger_than_byte_promoted_on_compare_statement.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -34,6 +35,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -45,9 +53,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_bigger_than_float_converted_to_double.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_bigger_than_float_converted_to_double.snap
index 12595076f1..957a48bdd0 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_bigger_than_float_converted_to_double.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_bigger_than_float_converted_to_double.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -35,6 +36,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -46,9 +54,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_smaller_or_equal_to_float_converted_to_float.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_smaller_or_equal_to_float_converted_to_float.snap
index e6e07046c3..3f0ce8278c 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_smaller_or_equal_to_float_converted_to_float.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__int_smaller_or_equal_to_float_converted_to_float.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__numerical_promotion_for_variadic_functions_without_declaration.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__numerical_promotion_for_variadic_functions_without_declaration.snap
index db4be1252f..a689933fce 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__numerical_promotion_for_variadic_functions_without_declaration.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__numerical_promotion_for_variadic_functions_without_declaration.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -52,6 +53,13 @@ entry:
 }
 
 declare void @main(%main*)
+
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -63,9 +71,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
 declare void @__init_main(%main*)
 
 declare void @main(%main*)
+
+declare void @__user_init_main(%main*)
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__unsingned_datatypes_smaller_than_dint_promoted_to_dint.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__unsingned_datatypes_smaller_than_dint_promoted_to_dint.snap
index dd753c1566..c5754123b9 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__unsingned_datatypes_smaller_than_dint_promoted_to_dint.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__typesystem_test__unsingned_datatypes_smaller_than_dint_promoted_to_dint.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/typesystem_test.rs
 expression: result
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -36,6 +37,13 @@ entry:
 }
 
 declare void @prg(%prg*)
+
+define void @__user_init_prg(%prg* %0) {
+entry:
+  %self = alloca %prg*, align 8
+  store %prg* %0, %prg** %self, align 8
+  ret void
+}
 ; ModuleID = '__init___testproject'
 source_filename = "__init___testproject"
 
@@ -47,9 +55,12 @@ source_filename = "__init___testproject"
 define void @__init___testproject() {
 entry:
   call void @__init_prg(%prg* @prg_instance)
+  call void @__user_init_prg(%prg* @prg_instance)
   ret void
 }
 
 declare void @__init_prg(%prg*)
 
 declare void @prg(%prg*)
+
+declare void @__user_init_prg(%prg*)
diff --git a/src/lowering.rs b/src/lowering.rs
index 2ab68df24b..c53f09eaa5 100644
--- a/src/lowering.rs
+++ b/src/lowering.rs
@@ -2,7 +2,7 @@ use crate::{
     index::{get_init_fn_name, Index, PouIndexEntry, VariableIndexEntry},
     resolver::const_evaluator::UnresolvableConstant,
 };
-use initializers::{Init, InitAssignments, Initializers, GLOBAL_SCOPE};
+use initializers::{get_user_init_fn_name, Init, InitAssignments, Initializers, GLOBAL_SCOPE};
 use plc_ast::{
     ast::{
         AstFactory, AstNode, AstStatement, CallStatement, CompilationUnit, ConfigVariable, DataType,
@@ -12,6 +12,7 @@ use plc_ast::{
     provider::IdProvider,
 };
 use plc_source::source_location::SourceLocation;
+use rustc_hash::FxHashMap;
 
 pub mod calls;
 mod initializers;
@@ -21,6 +22,7 @@ pub struct InitVisitor {
     index: Index,
     unresolved_initializers: Initializers,
     var_config_initializers: Vec<AstNode>,
+    user_inits: FxHashMap<String, bool>,
     ctxt: Context,
 }
 
@@ -50,6 +52,7 @@ impl InitVisitor {
             index,
             unresolved_initializers: Initializers::new(&unresolved_initializers),
             var_config_initializers: vec![],
+            user_inits: FxHashMap::default(),
             ctxt: Context::new(id_provider),
         }
     }
@@ -213,30 +216,37 @@ impl InitVisitor {
             })
         });
 
-        // collect necessary call statements to init-functions
-        let delegated_calls = self
-            .index
-            .get_pou_members(&implementation.name)
-            .iter()
-            .filter(|var| predicate(var))
-            .filter_map(|var| {
+        // collect necessary call statements to init-functions and user-defined init-functions
+        let mut implicit_calls = Vec::new();
+        let mut user_init_calls = Vec::new();
+        self.index.get_pou_members(&implementation.name).iter().filter(|var| predicate(var)).for_each(
+            |var| {
                 let dti =
                     self.index.get_effective_type_or_void_by_name(var.get_type_name()).get_type_information();
                 if dti.is_struct() {
-                    Some(create_call_statement(
+                    implicit_calls.push(create_call_statement(
                         &get_init_fn_name(dti.get_name()),
                         var.get_name(),
                         None,
                         self.ctxt.get_id_provider(),
                         &implementation.name_location,
-                    ))
-                } else {
-                    None
+                    ));
+                }
+                if self.user_inits.contains_key(dti.get_name()) {
+                    user_init_calls.push(create_call_statement(
+                        &get_user_init_fn_name(dti.get_name()),
+                        var.get_name(),
+                        None,
+                        self.ctxt.get_id_provider(),
+                        &implementation.name_location,
+                    ));
                 }
-            });
+            },
+        );
 
         let stmts = assignments
-            .chain(delegated_calls)
+            .chain(implicit_calls)
+            .chain(user_init_calls)
             .chain(std::mem::take(&mut implementation.statements))
             .collect::<Vec<_>>();
         implementation.statements = stmts;
@@ -339,6 +349,12 @@ impl AstVisitorMut for InitVisitor {
             self.unresolved_initializers.maybe_insert_initializer(&pou.name, None, &None);
         }
 
+        if matches!(pou.kind, PouType::FunctionBlock | PouType::Program) {
+            // add the POU to potential `FB_INIT` candidates
+            self.user_inits
+                .insert(pou.name.to_owned(), self.index.find_method(&pou.name, "fb_init").is_some());
+        }
+
         self.walk_with_scope(pou, Some(&pou.name.to_owned()));
     }
 }
diff --git a/src/lowering/initializers.rs b/src/lowering/initializers.rs
index 98410dc79d..45e76eecb5 100644
--- a/src/lowering/initializers.rs
+++ b/src/lowering/initializers.rs
@@ -145,6 +145,7 @@ fn create_init_units(lowerer: &InitVisitor) -> Vec<CompilationUnit> {
 
             create_init_unit(lowerer, container, init, &lookup)
         })
+        .chain(create_user_init_units(lowerer))
         .collect()
 }
 
@@ -195,22 +196,6 @@ fn create_init_unit(
         })
         .collect::<Vec<_>>();
 
-    if let Some(fbinit) = lowerer
-        .index
-        .find_method(container_name, "fb_init")
-        .and_then(|it| it.find_implementation(&lowerer.index))
-    {
-        let base = create_member_reference("self", id_provider.clone(), None);
-        let op = create_member_reference(
-            &fbinit.get_call_name().rsplit_once('.').map(|(_, name)| name).unwrap(),
-            id_provider.clone(),
-            Some(base),
-        );
-        let call_statement =
-            AstFactory::create_call_statement(op, None, id_provider.next_id(), location.clone());
-        statements.push(call_statement);
-    }
-
     let member_init_calls = lowerer
         .index
         .get_container_members(container_name)
@@ -244,6 +229,69 @@ fn create_init_unit(
     Some(new_unit(init_pou, implementation, INIT_COMPILATION_UNIT))
 }
 
+fn create_user_init_units(lowerer: &InitVisitor) -> Vec<CompilationUnit> {
+    lowerer
+        .user_inits
+        .iter()
+        .map(|(container_name, has_fb_init)| {
+            let location = SourceLocation::internal_in_unit(Some(INIT_COMPILATION_UNIT));
+            let mut id_provider = lowerer.ctxt.get_id_provider();
+            let param = vec![VariableBlock::default()
+                .with_block_type(VariableBlockType::InOut)
+                .with_variables(vec![Variable {
+                    name: "self".into(),
+                    data_type_declaration: DataTypeDeclaration::Reference {
+                        referenced_type: container_name.to_string(),
+                        location: location.clone(),
+                    },
+                    initializer: None,
+                    address: None,
+                    location: location.clone(),
+                }])];
+
+            let fn_name = get_user_init_fn_name(container_name);
+            let init_pou = new_pou(&fn_name, id_provider.next_id(), param, PouType::Init, &location);
+
+            let mut statements = lowerer
+                .index
+                .get_container_members(container_name)
+                .iter()
+                .filter_map(|member| {
+                    let member_type_name = member.get_type_name();
+                    let type_name = lowerer
+                        .index
+                        .get_effective_type_by_name(member_type_name)
+                        .map(|it| it.get_type_information().get_name())
+                        .unwrap_or(member_type_name);
+                    let call_name = get_user_init_fn_name(type_name);
+                    if !member.is_temp() && lowerer.user_inits.contains_key(type_name) {
+                        Some(create_call_statement(
+                            &call_name,
+                            member.get_name(),
+                            Some("self"),
+                            id_provider.clone(),
+                            &location,
+                        ))
+                    } else {
+                        None
+                    }
+                })
+                .collect::<Vec<_>>();
+
+            if *has_fb_init {
+                let base = create_member_reference("self", id_provider.clone(), None);
+                let op = create_member_reference("fb_init", id_provider.clone(), Some(base));
+                let call_statement =
+                    AstFactory::create_call_statement(op, None, id_provider.next_id(), location.clone());
+                statements.push(call_statement);
+            }
+            let implementation = new_implementation(&fn_name, statements, PouType::Init, location);
+
+            new_unit(init_pou, implementation, INIT_COMPILATION_UNIT)
+        })
+        .collect()
+}
+
 fn create_init_wrapper_function(
     lowerer: &mut InitVisitor,
     init_symbol_name: &'static str,
@@ -290,7 +338,7 @@ fn create_init_wrapper_function(
         }
     });
 
-    let mut assignments = if let Some(stmts) = lowerer.unresolved_initializers.get(GLOBAL_SCOPE) {
+    let mut statements = if let Some(stmts) = lowerer.unresolved_initializers.get(GLOBAL_SCOPE) {
         stmts
             .iter()
             .filter_map(|(var_name, initializer)| {
@@ -314,10 +362,10 @@ fn create_init_wrapper_function(
         })
         .collect::<Vec<_>>();
 
-    assignments.extend(calls);
+    statements.extend(calls);
 
     if !skip_var_config {
-        assignments.push(AstFactory::create_call_statement(
+        statements.push(AstFactory::create_call_statement(
             create_member_reference(VAR_CONFIG_INIT, id_provider.clone(), None),
             None,
             id_provider.next_id(),
@@ -325,8 +373,10 @@ fn create_init_wrapper_function(
         ));
     };
 
+    let user_init_calls = get_global_user_init_statements(lowerer);
+    statements.extend(user_init_calls);
     let implementation =
-        new_implementation(init_symbol_name, assignments, PouType::ProjectInit, SourceLocation::internal());
+        new_implementation(init_symbol_name, statements, PouType::ProjectInit, SourceLocation::internal());
     let mut global_init = new_unit(init_pou, implementation, init_symbol_name);
 
     if skip_var_config {
@@ -339,6 +389,50 @@ fn create_init_wrapper_function(
     Some(global_init)
 }
 
+fn get_global_user_init_statements(lowerer: &InitVisitor) -> Vec<AstNode> {
+    let global_instances = if let Some(global_instances) =
+        lowerer.unresolved_initializers.get(GLOBAL_SCOPE).map(|it| {
+            it.keys().filter_map(|var_name| {
+                lowerer.index.find_variable(None, &[var_name]).and_then(|it| {
+                    lowerer.index.find_effective_type_by_name(it.get_type_name()).and_then(|dt| {
+                        let name = dt.get_type_information().get_name();
+                        if lowerer.user_inits.contains_key(name) {
+                            Some((get_user_init_fn_name(name), var_name))
+                        } else {
+                            None
+                        }
+                    })
+                })
+            })
+        }) {
+        global_instances.collect::<Vec<_>>()
+    } else {
+        vec![]
+    };
+
+    let programs = lowerer.unresolved_initializers.iter().filter_map(|(scope, _)| {
+        if lowerer.index.find_pou(scope).is_some_and(|pou| pou.is_program()) {
+            Some((get_user_init_fn_name(scope), scope))
+        } else {
+            None
+        }
+    });
+    let mut id_provider = lowerer.ctxt.id_provider.clone();
+    programs
+        .chain(global_instances)
+        .map(|(fn_name, param)| {
+            let op = create_member_reference(&fn_name, lowerer.ctxt.id_provider.clone(), None);
+            let param = create_member_reference(param, lowerer.ctxt.id_provider.clone(), None);
+            AstFactory::create_call_statement(
+                op,
+                Some(param),
+                id_provider.next_id(),
+                SourceLocation::internal(),
+            )
+        })
+        .collect::<Vec<_>>()
+}
+
 fn new_pou(
     name: &str,
     id: AstId,
@@ -396,3 +490,7 @@ fn new_unit(pou: Pou, implementation: Implementation, file_name: &'static str) -
         file: FileMarker::Internal(file_name),
     }
 }
+
+pub(super) fn get_user_init_fn_name(type_name: &str) -> String {
+    format!("__user_init_{}", type_name)
+}
diff --git a/src/resolver/tests/resolve_and_lower_init_functions.rs b/src/resolver/tests/resolve_and_lower_init_functions.rs
index 2183d5b246..e042085f41 100644
--- a/src/resolver/tests/resolve_and_lower_init_functions.rs
+++ b/src/resolver/tests/resolve_and_lower_init_functions.rs
@@ -229,9 +229,9 @@ fn init_wrapper_function_created() {
     // we expect this function to have no parameters
     assert!(init.pous[0].variable_blocks.is_empty());
 
-    // we expect to the body to have 2 statements
+    // we expect to the body to have 3 statements
     let statements = &implementation.statements;
-    assert_eq!(statements.len(), 2);
+    assert_eq!(statements.len(), 3);
 
     // we expect the first statement in the function-body to assign `REF(s)` to `gs`, since
     // global variables are to be initialized first
@@ -292,6 +292,30 @@ fn init_wrapper_function_created() {
     }
     "###);
 
+    // we expect the third statement to call `__user_init_foo`, which checks for user-defined init functions and calls them
+    assert_debug_snapshot!(statements[2], @r#"
+    CallStatement {
+        operator: ReferenceExpr {
+            kind: Member(
+                Identifier {
+                    name: "__user_init_foo",
+                },
+            ),
+            base: None,
+        },
+        parameters: Some(
+            ReferenceExpr {
+                kind: Member(
+                    Identifier {
+                        name: "foo",
+                    },
+                ),
+                base: None,
+            },
+        ),
+    }
+    "#);
+
     // since `foo` has a member-instance of `bar`, we expect its initializer to call/propagate to `__init_bar` with its local member
     let init_foo = &units[1].implementations[1];
     assert_debug_snapshot!(init_foo.statements[0], @r###"
diff --git a/src/tests/adr/arrays_adr.rs b/src/tests/adr/arrays_adr.rs
index 96e129564f..0f43fcb607 100644
--- a/src/tests/adr/arrays_adr.rs
+++ b/src/tests/adr/arrays_adr.rs
@@ -103,6 +103,13 @@ fn assigning_full_arrays() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -115,12 +122,15 @@ fn assigning_full_arrays() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
+
+    declare void @__user_init_prg(%prg*)
     "#);
 }
 
@@ -186,6 +196,13 @@ fn accessing_array_elements() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -198,11 +215,14 @@ fn accessing_array_elements() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
+
+    declare void @__user_init_prg(%prg*)
     "#);
 }
diff --git a/src/tests/adr/enum_adr.rs b/src/tests/adr/enum_adr.rs
index 6d9d7a0e6b..49263b450b 100644
--- a/src/tests/adr/enum_adr.rs
+++ b/src/tests/adr/enum_adr.rs
@@ -115,7 +115,7 @@ fn using_enums() {
         END_PROGRAM
     "#;
 
-    insta::assert_snapshot!(codegen(src), @r###"
+    insta::assert_snapshot!(codegen(src), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -154,6 +154,13 @@ fn using_enums() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -165,11 +172,14 @@ fn using_enums() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
-    "###);
+
+    declare void @__user_init_prg(%prg*)
+    "#);
 }
diff --git a/src/tests/adr/initializer_functions_adr.rs b/src/tests/adr/initializer_functions_adr.rs
index 4d90969373..dd31b5d5b9 100644
--- a/src/tests/adr/initializer_functions_adr.rs
+++ b/src/tests/adr/initializer_functions_adr.rs
@@ -349,7 +349,7 @@ fn global_initializers_are_wrapped_in_single_init_function() {
 
     let init_impl = &units[2].implementations[0];
     assert_eq!(&init_impl.name, "__init___testproject");
-    assert_eq!(init_impl.statements.len(), 4);
+    assert_eq!(init_impl.statements.len(), 7);
     // global variable blocks are initialized first, hence we expect the first statement in the `__init` body to be an
     // `Assignment`, assigning `REF(s)` to `gs`. This is followed by three `CallStatements`, one for each global `PROGRAM`
     // instance.
@@ -553,7 +553,7 @@ fn generating_init_functions() {
     ";
 
     let res = codegen(src);
-    assert_snapshot!(res, @r###"
+    assert_snapshot!(res, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -641,6 +641,33 @@ fn generating_init_functions() {
     }
 
     declare void @baz(%baz*)
+
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      %deref = load %bar*, %bar** %self, align 8
+      %fb = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %fb)
+      ret void
+    }
+
+    define void @__user_init_baz(%baz* %0) {
+    entry:
+      %self = alloca %baz*, align 8
+      store %baz* %0, %baz** %self, align 8
+      %deref = load %baz*, %baz** %self, align 8
+      %fb = getelementptr inbounds %baz, %baz* %deref, i32 0, i32 0
+      call void @__user_init_bar(%bar* %fb)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -660,6 +687,7 @@ fn generating_init_functions() {
     entry:
       call void @__init_baz(%baz* @baz_instance)
       call void @__init_mystruct(%myStruct* @s)
+      call void @__user_init_baz(%baz* @baz_instance)
       ret void
     }
 
@@ -672,7 +700,9 @@ fn generating_init_functions() {
     declare void @foo(%foo*)
 
     declare void @__init_mystruct(%myStruct*)
-    "###);
+
+    declare void @__user_init_baz(%baz*)
+    "#);
 }
 
 /// When dealing with local stack-allocated variables (`VAR_TEMP`-blocks (in addition to `VAR` for functions)),
@@ -708,7 +738,7 @@ fn intializing_temporary_variables() {
         ";
 
     let res = codegen(src);
-    assert_snapshot!(res, @r###"
+    assert_snapshot!(res, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -741,6 +771,7 @@ fn intializing_temporary_variables() {
       store [81 x i8]* @ps, [81 x i8]** %s, align 8
       store [81 x i8]* @ps2, [81 x i8]** %s2, align 8
       call void @__init_foo(%foo* %fb)
+      call void @__user_init_foo(%foo* %fb)
       call void @foo(%foo* %fb)
       %main_ret = load i32, i32* %main, align 4
       ret i32 %main_ret
@@ -748,6 +779,8 @@ fn intializing_temporary_variables() {
 
     declare void @__init_foo(%foo*)
 
+    declare void @__user_init_foo(%foo*)
+
     ; Function Attrs: argmemonly nofree nounwind willreturn
     declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
 
@@ -771,6 +804,13 @@ fn intializing_temporary_variables() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -780,7 +820,7 @@ fn intializing_temporary_variables() {
     entry:
       ret void
     }
-    "###)
+    "#)
 }
 
 /// Initializing method variables behaves very similar to stack local variables from the previous example.
@@ -802,7 +842,7 @@ fn initializing_method_variables() {
     END_FUNCTION_BLOCK
     ";
 
-    insta::assert_snapshot!(codegen(src), @r###"
+    insta::assert_snapshot!(codegen(src), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -839,6 +879,13 @@ fn initializing_method_variables() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -848,7 +895,7 @@ fn initializing_method_variables() {
     entry:
       ret void
     }
-    "###);
+    "#);
 
     // When no local reference is found, the parent variable is used if present. Otherwise we look for a
     // global variable.
@@ -923,6 +970,13 @@ fn initializing_method_variables() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -989,6 +1043,13 @@ fn initializing_method_variables() {
     }
 
     declare void @foo(%foo*)
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
diff --git a/src/tests/adr/pou_adr.rs b/src/tests/adr/pou_adr.rs
index f1c790d2e9..543067006b 100644
--- a/src/tests/adr/pou_adr.rs
+++ b/src/tests/adr/pou_adr.rs
@@ -249,7 +249,7 @@ fn programs_state_is_stored_in_a_struct() {
 
 #[test]
 fn codegen_of_a_program_pou() {
-    insta::assert_snapshot!(codegen(DEFAULT_PRG),@r###"
+    insta::assert_snapshot!(codegen(DEFAULT_PRG),@r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -282,6 +282,13 @@ fn codegen_of_a_program_pou() {
     }
 
     declare void @main_prg(%main_prg*)
+
+    define void @__user_init_main_prg(%main_prg* %0) {
+    entry:
+      %self = alloca %main_prg*, align 8
+      store %main_prg* %0, %main_prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -293,13 +300,16 @@ fn codegen_of_a_program_pou() {
     define void @__init___testproject() {
     entry:
       call void @__init_main_prg(%main_prg* @main_prg_instance)
+      call void @__user_init_main_prg(%main_prg* @main_prg_instance)
       ret void
     }
 
     declare void @__init_main_prg(%main_prg*)
 
     declare void @main_prg(%main_prg*)
-    "###);
+
+    declare void @__user_init_main_prg(%main_prg*)
+    "#);
 }
 
 /// Calling a program works like this:
@@ -319,7 +329,7 @@ fn calling_a_program() {
         {DEFAULT_PRG}
     "#
     );
-    insta::assert_snapshot!(codegen(calling_prg.as_str()), @r###"
+    insta::assert_snapshot!(codegen(calling_prg.as_str()), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -369,6 +379,13 @@ fn calling_a_program() {
     }
 
     declare void @main_prg(%main_prg*)
+
+    define void @__user_init_main_prg(%main_prg* %0) {
+    entry:
+      %self = alloca %main_prg*, align 8
+      store %main_prg* %0, %main_prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -380,13 +397,16 @@ fn calling_a_program() {
     define void @__init___testproject() {
     entry:
       call void @__init_main_prg(%main_prg* @main_prg_instance)
+      call void @__user_init_main_prg(%main_prg* @main_prg_instance)
       ret void
     }
 
     declare void @__init_main_prg(%main_prg*)
 
     declare void @main_prg(%main_prg*)
-    "###);
+
+    declare void @__user_init_main_prg(%main_prg*)
+    "#);
 }
 
 /// # FUNCTION BLOCK
@@ -414,7 +434,7 @@ const DEFAULT_FB: &str = r#"
 
 #[test]
 fn function_blocks_get_a_method_with_a_self_parameter() {
-    insta::assert_snapshot!(codegen(DEFAULT_FB), @r###"
+    insta::assert_snapshot!(codegen(DEFAULT_FB), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -447,6 +467,13 @@ fn function_blocks_get_a_method_with_a_self_parameter() {
     }
 
     declare void @main_fb(%main_fb*)
+
+    define void @__user_init_main_fb(%main_fb* %0) {
+    entry:
+      %self = alloca %main_fb*, align 8
+      store %main_fb* %0, %main_fb** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -456,7 +483,7 @@ fn function_blocks_get_a_method_with_a_self_parameter() {
     entry:
       ret void
     }
-    "###);
+    "#);
 }
 
 /// Calling a function block works like this:
@@ -477,7 +504,7 @@ fn calling_a_function_block() {
         {DEFAULT_FB}
     "#
     );
-    insta::assert_snapshot!(codegen(calling_prg.as_str()), @r###"
+    insta::assert_snapshot!(codegen(calling_prg.as_str()), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -542,6 +569,23 @@ fn calling_a_function_block() {
       store %main_fb* %0, %main_fb** %self, align 8
       ret void
     }
+
+    define void @__user_init_main_fb(%main_fb* %0) {
+    entry:
+      %self = alloca %main_fb*, align 8
+      store %main_fb* %0, %main_fb** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      %deref = load %foo*, %foo** %self, align 8
+      %fb = getelementptr inbounds %foo, %foo* %deref, i32 0, i32 2
+      call void @__user_init_main_fb(%main_fb* %fb)
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -555,6 +599,7 @@ fn calling_a_function_block() {
     define void @__init___testproject() {
     entry:
       call void @__init_foo(%foo* @foo_instance)
+      call void @__user_init_foo(%foo* @foo_instance)
       ret void
     }
 
@@ -563,7 +608,9 @@ fn calling_a_function_block() {
     declare void @foo(%foo*)
 
     declare void @main_fb(%main_fb*)
-    "###);
+
+    declare void @__user_init_foo(%foo*)
+    "#);
 }
 
 /// # FUNCTION
@@ -636,7 +683,7 @@ fn calling_a_function() {
         {DEFAULT_FUNC}
     "#
     );
-    insta::assert_snapshot!(codegen(calling_prg.as_str()), @r###"
+    insta::assert_snapshot!(codegen(calling_prg.as_str()), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -686,6 +733,13 @@ fn calling_a_function() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -697,13 +751,16 @@ fn calling_a_function() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
-    "###);
+
+    declare void @__user_init_prg(%prg*)
+    "#);
 }
 
 /// Returning complex/aggregate types (string, array, struct) from a function cost a lot of compile-performance. complex types
@@ -730,7 +787,7 @@ fn return_a_complex_type_from_function() {
             s := foo();
         END_FUNCTION
     "#;
-    insta::assert_snapshot!(codegen(returning_string), @r###"
+    insta::assert_snapshot!(codegen(returning_string), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -785,6 +842,13 @@ fn return_a_complex_type_from_function() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -796,13 +860,16 @@ fn return_a_complex_type_from_function() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
-    "###);
+
+    declare void @__user_init_prg(%prg*)
+    "#);
 }
 
 /// Aggregate types which are passed to a function by-value will be passed as a reference by the compiler.
@@ -843,7 +910,7 @@ fn passing_aggregate_types_to_functions_by_value() {
     "###;
 
     //internally we pass the two strings str1, and str2 as pointers to StrEqual because of the {ref}
-    insta::assert_snapshot!(codegen(src), @r###"
+    insta::assert_snapshot!(codegen(src), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -926,6 +993,13 @@ fn passing_aggregate_types_to_functions_by_value() {
     }
 
     declare void @main(%main*)
+
+    define void @__user_init_main(%main* %0) {
+    entry:
+      %self = alloca %main*, align 8
+      store %main* %0, %main** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -939,13 +1013,16 @@ fn passing_aggregate_types_to_functions_by_value() {
     define void @__init___testproject() {
     entry:
       call void @__init_main(%main* @main_instance)
+      call void @__user_init_main(%main* @main_instance)
       ret void
     }
 
     declare void @__init_main(%main*)
 
     declare void @main(%main*)
-    "###);
+
+    declare void @__user_init_main(%main*)
+    "#);
 }
 
 /// Passing aggregate types to a function is an expensive operation, this is why the compiler offers
@@ -975,7 +1052,7 @@ fn passing_by_ref_to_functions() {
     "###;
 
     //internally we pass the two strings str1, and str2 as pointers to StrEqual because of the {ref}
-    insta::assert_snapshot!(codegen(src), @r###"
+    insta::assert_snapshot!(codegen(src), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -1019,6 +1096,13 @@ fn passing_by_ref_to_functions() {
     }
 
     declare void @main(%main*)
+
+    define void @__user_init_main(%main* %0) {
+    entry:
+      %self = alloca %main*, align 8
+      store %main* %0, %main** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -1030,11 +1114,14 @@ fn passing_by_ref_to_functions() {
     define void @__init___testproject() {
     entry:
       call void @__init_main(%main* @main_instance)
+      call void @__user_init_main(%main* @main_instance)
       ret void
     }
 
     declare void @__init_main(%main*)
 
     declare void @main(%main*)
-    "###);
+
+    declare void @__user_init_main(%main*)
+    "#);
 }
diff --git a/src/tests/adr/strings_adr.rs b/src/tests/adr/strings_adr.rs
index 0700dc659b..8915277d88 100644
--- a/src/tests/adr/strings_adr.rs
+++ b/src/tests/adr/strings_adr.rs
@@ -62,7 +62,7 @@ fn assigning_strings() {
         "#;
 
     // ... the assignments will be performed as a memcpy
-    insta::assert_snapshot!(codegen(src), @r###"
+    insta::assert_snapshot!(codegen(src), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -99,6 +99,13 @@ fn assigning_strings() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -110,13 +117,16 @@ fn assigning_strings() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
-    "###);
+
+    declare void @__user_init_prg(%prg*)
+    "#);
 }
 
 /// STRING literals will be generated as global constants, so they can be used as a source of a memcpy
@@ -135,7 +145,7 @@ fn assigning_string_literals() {
         "#;
 
     // ... will be initialized directly in the variable's definition
-    insta::assert_snapshot!(codegen(src), @r###"
+    insta::assert_snapshot!(codegen(src), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -175,6 +185,13 @@ fn assigning_string_literals() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -186,11 +203,14 @@ fn assigning_string_literals() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
-    "###);
+
+    declare void @__user_init_prg(%prg*)
+    "#);
 }
diff --git a/src/tests/adr/structs_adr.rs b/src/tests/adr/structs_adr.rs
index 115653f656..49d1079df8 100644
--- a/src/tests/adr/structs_adr.rs
+++ b/src/tests/adr/structs_adr.rs
@@ -140,7 +140,7 @@ fn initializing_a_struct() {
         "#;
 
     // ... will be initialized directly in the variable's definition
-    insta::assert_snapshot!(codegen(src), @r###"
+    insta::assert_snapshot!(codegen(src), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -205,6 +205,13 @@ fn initializing_a_struct() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -220,13 +227,16 @@ fn initializing_a_struct() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
-    "###);
+
+    declare void @__user_init_prg(%prg*)
+    "#);
 }
 
 /// Structs are aggregate types. This means that passing them to functions and assigning them
@@ -253,7 +263,7 @@ fn assigning_structs() {
         "#;
 
     // ... the assignment p1 := p2 will be performed as a memcpy
-    insta::assert_snapshot!(codegen(src), @r###"
+    insta::assert_snapshot!(codegen(src), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -307,6 +317,13 @@ fn assigning_structs() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -320,13 +337,16 @@ fn assigning_structs() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
-    "###);
+
+    declare void @__user_init_prg(%prg*)
+    "#);
 }
 
 /// Accessing STRUCT's members uses the LLVM GEP statement to get a pointer
@@ -358,7 +378,7 @@ fn accessing_struct_members() {
         "#;
 
     // ... will be initialized directly in the variable's definition
-    insta::assert_snapshot!(codegen(src), @r###"
+    insta::assert_snapshot!(codegen(src), @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -427,6 +447,13 @@ fn accessing_struct_members() {
     }
 
     declare void @prg(%prg*)
+
+    define void @__user_init_prg(%prg* %0) {
+    entry:
+      %self = alloca %prg*, align 8
+      store %prg* %0, %prg** %self, align 8
+      ret void
+    }
     ; ModuleID = '__init___testproject'
     source_filename = "__init___testproject"
 
@@ -442,11 +469,14 @@ fn accessing_struct_members() {
     define void @__init___testproject() {
     entry:
       call void @__init_prg(%prg* @prg_instance)
+      call void @__user_init_prg(%prg* @prg_instance)
       ret void
     }
 
     declare void @__init_prg(%prg*)
 
     declare void @prg(%prg*)
-    "###);
+
+    declare void @__user_init_prg(%prg*)
+    "#);
 }
diff --git a/tests/integration/snapshots/tests__integration__cfc__ir__actions_debug.snap b/tests/integration/snapshots/tests__integration__cfc__ir__actions_debug.snap
index f265533ff7..2605fc0979 100644
--- a/tests/integration/snapshots/tests__integration__cfc__ir__actions_debug.snap
+++ b/tests/integration/snapshots/tests__integration__cfc__ir__actions_debug.snap
@@ -1,6 +1,7 @@
 ---
 source: tests/integration/cfc.rs
 expression: output_file_content_without_headers
+snapshot_kind: text
 ---
 %main = type { i32, i32 }
 
@@ -50,9 +51,17 @@ entry:
   ret void
 }
 
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
 define void @__init___plc() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 
diff --git a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return.snap b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return.snap
index ec537c437d..2938a5a281 100644
--- a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return.snap
+++ b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return.snap
@@ -1,6 +1,7 @@
 ---
 source: tests/integration/cfc.rs
 expression: output_file_content_without_headers
+snapshot_kind: text
 ---
 %conditional_return = type { i32 }
 
@@ -29,6 +30,13 @@ entry:
   ret void
 }
 
+define void @__user_init_conditional_return(%conditional_return* %0) {
+entry:
+  %self = alloca %conditional_return*, align 8
+  store %conditional_return* %0, %conditional_return** %self, align 8
+  ret void
+}
+
 define void @__init___plc() {
 entry:
   ret void
diff --git a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true.snap b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true.snap
index 74638796d3..6c5202c5ef 100644
--- a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true.snap
+++ b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true.snap
@@ -1,6 +1,7 @@
 ---
 source: tests/integration/cfc.rs
 expression: output_file_content_without_headers
+snapshot_kind: text
 ---
 %conditional_return = type { i32 }
 
@@ -53,6 +54,13 @@ entry:
   ret void
 }
 
+define void @__user_init_conditional_return(%conditional_return* %0) {
+entry:
+  %self = alloca %conditional_return*, align 8
+  store %conditional_return* %0, %conditional_return** %self, align 8
+  ret void
+}
+
 define void @__init___plc() {
 entry:
   ret void
diff --git a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true_negated.snap b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true_negated.snap
index 6a0ec004aa..cbe9d93a93 100644
--- a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true_negated.snap
+++ b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true_negated.snap
@@ -1,6 +1,7 @@
 ---
 source: tests/integration/cfc.rs
 expression: output_file_content_without_headers
+snapshot_kind: text
 ---
 %conditional_return = type { i32 }
 
@@ -54,6 +55,13 @@ entry:
   ret void
 }
 
+define void @__user_init_conditional_return(%conditional_return* %0) {
+entry:
+  %self = alloca %conditional_return*, align 8
+  store %conditional_return* %0, %conditional_return** %self, align 8
+  ret void
+}
+
 define void @__init___plc() {
 entry:
   ret void
diff --git a/tests/integration/snapshots/tests__integration__cfc__ir__jump_debug.snap b/tests/integration/snapshots/tests__integration__cfc__ir__jump_debug.snap
index 91abc495ef..f550a61ff9 100644
--- a/tests/integration/snapshots/tests__integration__cfc__ir__jump_debug.snap
+++ b/tests/integration/snapshots/tests__integration__cfc__ir__jump_debug.snap
@@ -1,6 +1,7 @@
 ---
 source: tests/integration/cfc.rs
 expression: output_file_content_without_headers
+snapshot_kind: text
 ---
 %foo = type { i32 }
 
@@ -33,9 +34,17 @@ entry:
   ret void
 }
 
+define void @__user_init_foo(%foo* %0) {
+entry:
+  %self = alloca %foo*, align 8
+  store %foo* %0, %foo** %self, align 8
+  ret void
+}
+
 define void @__init___plc() {
 entry:
   call void @__init_foo(%foo* @foo_instance)
+  call void @__user_init_foo(%foo* @foo_instance)
   ret void
 }
 
diff --git a/tests/integration/snapshots/tests__integration__cfc__ir__sink_source_debug.snap b/tests/integration/snapshots/tests__integration__cfc__ir__sink_source_debug.snap
index 78b2db812e..0acd5b2ed9 100644
--- a/tests/integration/snapshots/tests__integration__cfc__ir__sink_source_debug.snap
+++ b/tests/integration/snapshots/tests__integration__cfc__ir__sink_source_debug.snap
@@ -1,6 +1,7 @@
 ---
 source: tests/integration/cfc.rs
 expression: output_file_content_without_headers
+snapshot_kind: text
 ---
 %main = type { i32 }
 
@@ -25,9 +26,17 @@ entry:
   ret void
 }
 
+define void @__user_init_main(%main* %0) {
+entry:
+  %self = alloca %main*, align 8
+  store %main* %0, %main** %self, align 8
+  ret void
+}
+
 define void @__init___plc() {
 entry:
   call void @__init_main(%main* @main_instance)
+  call void @__user_init_main(%main* @main_instance)
   ret void
 }
 

From d67dad65ad4f5e39b7b2b367f0739325e6f94c04 Mon Sep 17 00:00:00 2001
From: Michael Haselberger <Michael.HASELBERGER@bachmann.info>
Date: Tue, 15 Apr 2025 11:03:11 +0200
Subject: [PATCH 3/9] update snapshots

---
 .../src/tests/inheritance_tests.rs            |  24 +-
 src/codegen/tests/oop_tests/super_tests.rs    | 275 ++++++++++++++++++
 2 files changed, 297 insertions(+), 2 deletions(-)

diff --git a/compiler/plc_lowering/src/tests/inheritance_tests.rs b/compiler/plc_lowering/src/tests/inheritance_tests.rs
index 6fc747c6ca..a6ab636c7c 100644
--- a/compiler/plc_lowering/src/tests/inheritance_tests.rs
+++ b/compiler/plc_lowering/src/tests/inheritance_tests.rs
@@ -1533,7 +1533,7 @@ mod units_tests {
 
         let (_, project) = parse_and_annotate("test", vec![src]).unwrap();
         let unit = &project.units[0].get_unit().implementations[3];
-        assert_debug_snapshot!(unit, @r###"
+        assert_debug_snapshot!(unit, @r#"
         Implementation {
             name: "main",
             type_name: "main",
@@ -1560,6 +1560,26 @@ mod units_tests {
                         },
                     ),
                 },
+                CallStatement {
+                    operator: ReferenceExpr {
+                        kind: Member(
+                            Identifier {
+                                name: "__user_init_child",
+                            },
+                        ),
+                        base: None,
+                    },
+                    parameters: Some(
+                        ReferenceExpr {
+                            kind: Member(
+                                Identifier {
+                                    name: "fb",
+                                },
+                            ),
+                            base: None,
+                        },
+                    ),
+                },
                 Assignment {
                     left: ReferenceExpr {
                         kind: Deref,
@@ -1721,7 +1741,7 @@ mod units_tests {
             generic: false,
             access: None,
         }
-        "###)
+        "#)
     }
 
     #[test]
diff --git a/src/codegen/tests/oop_tests/super_tests.rs b/src/codegen/tests/oop_tests/super_tests.rs
index b13ab2a4ee..82547ebb86 100644
--- a/src/codegen/tests/oop_tests/super_tests.rs
+++ b/src/codegen/tests/oop_tests/super_tests.rs
@@ -58,6 +58,23 @@ fn super_keyword_basic_access() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -126,6 +143,23 @@ fn super_without_deref() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -239,6 +273,23 @@ fn super_in_method_calls() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -318,6 +369,23 @@ fn super_in_complex_expressions() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -393,6 +461,23 @@ fn super_with_array_access() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -536,6 +621,33 @@ fn super_in_multi_level_inheritance() {
       ret void
     }
 
+    define void @__user_init_grandparent(%grandparent* %0) {
+    entry:
+      %self = alloca %grandparent*, align 8
+      store %grandparent* %0, %grandparent** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      %deref = load %parent*, %parent** %self, align 8
+      %__grandparent = getelementptr inbounds %parent, %parent* %deref, i32 0, i32 0
+      call void @__user_init_grandparent(%grandparent* %__grandparent)
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -614,6 +726,23 @@ fn super_with_pointer_operations() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -740,6 +869,23 @@ fn super_in_conditionals() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -809,6 +955,23 @@ fn super_with_const_variables() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -927,6 +1090,23 @@ fn super_as_function_parameter() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -1053,6 +1233,23 @@ fn super_with_deeply_nested_expressions() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -1264,6 +1461,23 @@ fn super_in_loop_constructs() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -1390,6 +1604,33 @@ fn super_with_method_overrides_in_three_levels() {
       ret void
     }
 
+    define void @__user_init_grandparent(%grandparent* %0) {
+    entry:
+      %self = alloca %grandparent*, align 8
+      store %grandparent* %0, %grandparent** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      %deref = load %parent*, %parent** %self, align 8
+      %__grandparent = getelementptr inbounds %parent, %parent* %deref, i32 0, i32 0
+      call void @__user_init_grandparent(%grandparent* %__grandparent)
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -1574,6 +1815,23 @@ fn super_with_structured_types() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -1672,6 +1930,23 @@ fn super_in_action_blocks() {
       ret void
     }
 
+    define void @__user_init_child(%child* %0) {
+    entry:
+      %self = alloca %child*, align 8
+      store %child* %0, %child** %self, align 8
+      %deref = load %child*, %child** %self, align 8
+      %__parent = getelementptr inbounds %child, %child* %deref, i32 0, i32 0
+      call void @__user_init_parent(%parent* %__parent)
+      ret void
+    }
+
+    define void @__user_init_parent(%parent* %0) {
+    entry:
+      %self = alloca %parent*, align 8
+      store %parent* %0, %parent** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void

From c755d85baf55831919005851b83edacad674ac69 Mon Sep 17 00:00:00 2001
From: Michael Haselberger <Michael.HASELBERGER@bachmann.info>
Date: Tue, 15 Apr 2025 12:30:27 +0200
Subject: [PATCH 4/9] add struct support, tests

---
 src/codegen/tests/debug_tests.rs              |  22 +-
 .../complex_initializers.rs                   | 239 ++++++++++++++++++
 src/codegen/tests/oop_tests/super_tests.rs    |  11 +
 ...var_nested_struct_added_to_debug_info.snap |  19 ++
 ...global_var_struct_added_to_debug_info.snap |   9 +
 src/lowering.rs                               |   3 +
 src/tests/adr/initializer_functions_adr.rs    |  34 ++-
 tests/lit/single/init/user_init.st            |  29 +++
 8 files changed, 358 insertions(+), 8 deletions(-)
 create mode 100644 tests/lit/single/init/user_init.st

diff --git a/src/codegen/tests/debug_tests.rs b/src/codegen/tests/debug_tests.rs
index a3a4fc622b..91d86b89eb 100644
--- a/src/codegen/tests/debug_tests.rs
+++ b/src/codegen/tests/debug_tests.rs
@@ -599,7 +599,7 @@ END_FUNCTION
     ",
     );
 
-    assert_snapshot!(result, @r###"
+    assert_snapshot!(result, @r#"
     ; ModuleID = '<internal>'
     source_filename = "<internal>"
 
@@ -631,6 +631,7 @@ END_FUNCTION
       call void @llvm.dbg.declare(metadata i16* %i, metadata !48, metadata !DIExpression()), !dbg !49
       store i16 0, i16* %i, align 2
       call void @__init_struct_(%struct_* %st), !dbg !50
+      call void @__user_init_struct_(%struct_* %st), !dbg !50
       %s1 = getelementptr inbounds %struct_, %struct_* %st, i32 0, i32 2, !dbg !51
       %3 = bitcast [81 x i8]* %s to i8*, !dbg !51
       %4 = bitcast [81 x i8]* %s1 to i8*, !dbg !51
@@ -715,6 +716,23 @@ END_FUNCTION
       ret void
     }
 
+    define void @__user_init_inner(%inner* %0) {
+    entry:
+      %self = alloca %inner*, align 8
+      store %inner* %0, %inner** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_struct_(%struct_* %0) {
+    entry:
+      %self = alloca %struct_*, align 8
+      store %struct_* %0, %struct_** %self, align 8
+      %deref = load %struct_*, %struct_** %self, align 8
+      %inner = getelementptr inbounds %struct_, %struct_* %deref, i32 0, i32 0
+      call void @__user_init_inner(%inner* %inner)
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -790,5 +808,5 @@ END_FUNCTION
     !60 = !DILocation(line: 42, column: 4, scope: !36)
     !61 = !DILocation(line: 43, column: 4, scope: !36)
     !62 = !DILocation(line: 45, scope: !36)
-    "###);
+    "#);
 }
diff --git a/src/codegen/tests/initialization_test/complex_initializers.rs b/src/codegen/tests/initialization_test/complex_initializers.rs
index f0c5559cc4..213c6e0bbd 100644
--- a/src/codegen/tests/initialization_test/complex_initializers.rs
+++ b/src/codegen/tests/initialization_test/complex_initializers.rs
@@ -749,10 +749,20 @@ fn struct_types() {
       ret void
     }
 
+    define void @__user_init_myStruct(%myStruct* %0) {
+    entry:
+      %self = alloca %myStruct*, align 8
+      store %myStruct* %0, %myStruct** %self, align 8
+      ret void
+    }
+
     define void @__user_init_prog(%prog* %0) {
     entry:
       %self = alloca %prog*, align 8
       store %prog* %0, %prog** %self, align 8
+      %deref = load %prog*, %prog** %self, align 8
+      %str = getelementptr inbounds %prog, %prog* %deref, i32 0, i32 0
+      call void @__user_init_myStruct(%myStruct* %str)
       ret void
     }
 
@@ -879,6 +889,13 @@ fn stateful_pous_methods_and_structs_get_init_functions() {
       ret void
     }
 
+    define void @__user_init_myStruct(%myStruct* %0) {
+    entry:
+      %self = alloca %myStruct*, align 8
+      store %myStruct* %0, %myStruct** %self, align 8
+      ret void
+    }
+
     define void @__user_init_prog(%prog* %0) {
     entry:
       %self = alloca %prog*, align 8
@@ -2205,3 +2222,225 @@ fn user_fb_init_is_added_and_called_if_it_exists() {
     }
     "#);
 }
+
+#[test]
+fn user_fb_init_in_global_struct() {
+  let res = generate_to_string(
+    "Test",
+    vec![SourceCode::from(
+        r#"
+        TYPE
+            bar : STRUCT
+               f: foo; 
+            END_STRUCT;
+        END_TYPE
+
+        FUNCTION_BLOCK foo
+        VAR
+            x : INT := 0;
+            y : INT := 0;
+        END_VAR
+            METHOD FB_INIT
+                x := 1;
+                y := 2;
+            END_METHOD
+        END_FUNCTION_BLOCK
+
+        PROGRAM prog 
+        VAR 
+            str: bar;
+        END_VAR
+            str.f();
+        END_PROGRAM
+        "#,
+        )],
+    )
+    .unwrap();
+
+    assert_snapshot!(res, @r#"
+    ; ModuleID = '<internal>'
+    source_filename = "<internal>"
+
+    %prog = type { %bar }
+    %bar = type { %foo }
+    %foo = type { i16, i16 }
+
+    @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 0, void ()* @__init___Test, i8* null }]
+    @prog_instance = global %prog zeroinitializer
+    @__bar__init = constant %bar zeroinitializer
+    @__foo__init = constant %foo zeroinitializer
+
+    define void @foo(%foo* %0) {
+    entry:
+      %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
+      %y = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
+      ret void
+    }
+
+    define void @foo_FB_INIT(%foo* %0) {
+    entry:
+      %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
+      %y = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
+      store i16 1, i16* %x, align 2
+      store i16 2, i16* %y, align 2
+      ret void
+    }
+
+    define void @prog(%prog* %0) {
+    entry:
+      %str = getelementptr inbounds %prog, %prog* %0, i32 0, i32 0
+      %f = getelementptr inbounds %bar, %bar* %str, i32 0, i32 0
+      call void @foo(%foo* %f)
+      ret void
+    }
+
+    define void @__init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      %deref = load %bar*, %bar** %self, align 8
+      %f = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+      call void @__init_foo(%foo* %f)
+      ret void
+    }
+
+    define void @__init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
+    define void @__init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      %deref = load %prog*, %prog** %self, align 8
+      %str = getelementptr inbounds %prog, %prog* %deref, i32 0, i32 0
+      call void @__init_bar(%bar* %str)
+      ret void
+    }
+
+    define void @__user_init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      %deref = load %prog*, %prog** %self, align 8
+      %str = getelementptr inbounds %prog, %prog* %deref, i32 0, i32 0
+      call void @__user_init_bar(%bar* %str)
+      ret void
+    }
+
+    define void @__user_init_bar(%bar* %0) {
+    entry:
+      %self = alloca %bar*, align 8
+      store %bar* %0, %bar** %self, align 8
+      %deref = load %bar*, %bar** %self, align 8
+      %f = getelementptr inbounds %bar, %bar* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %f)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      %deref = load %foo*, %foo** %self, align 8
+      call void @foo_FB_INIT(%foo* %deref)
+      ret void
+    }
+
+    define void @__init___Test() {
+    entry:
+      call void @__init_prog(%prog* @prog_instance)
+      call void @__user_init_prog(%prog* @prog_instance)
+      ret void
+    }
+    "#);
+}
+
+#[test]
+fn user_init_called_when_declared_as_external() {
+  let res = generate_to_string(
+    "Test",
+    vec![SourceCode::from(
+        r#"
+        {external}
+        FUNCTION_BLOCK foo
+        VAR
+            x : INT := 0;
+            y : INT := 0;
+        END_VAR
+            METHOD FB_INIT
+                x := 1;
+                y := 2;
+            END_METHOD
+        END_FUNCTION_BLOCK
+
+        PROGRAM prog 
+        VAR 
+            f: foo;
+        END_VAR
+            f();
+        END_PROGRAM
+        "#,
+        )],
+    )
+    .unwrap();
+
+    assert_snapshot!(res, @r#"
+    ; ModuleID = '<internal>'
+    source_filename = "<internal>"
+
+    %prog = type { %foo }
+    %foo = type { i16, i16 }
+
+    @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 0, void ()* @__init___Test, i8* null }]
+    @prog_instance = global %prog zeroinitializer
+    @__foo__init = external global %foo
+
+    declare void @foo(%foo*)
+
+    declare void @foo_FB_INIT(%foo*)
+
+    define void @prog(%prog* %0) {
+    entry:
+      %f = getelementptr inbounds %prog, %prog* %0, i32 0, i32 0
+      call void @foo(%foo* %f)
+      ret void
+    }
+
+    define void @__init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_prog(%prog* %0) {
+    entry:
+      %self = alloca %prog*, align 8
+      store %prog* %0, %prog** %self, align 8
+      %deref = load %prog*, %prog** %self, align 8
+      %f = getelementptr inbounds %prog, %prog* %deref, i32 0, i32 0
+      call void @__user_init_foo(%foo* %f)
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      %deref = load %foo*, %foo** %self, align 8
+      call void @foo_FB_INIT(%foo* %deref)
+      ret void
+    }
+
+    define void @__init___Test() {
+    entry:
+      call void @__init_prog(%prog* @prog_instance)
+      call void @__user_init_prog(%prog* @prog_instance)
+      ret void
+    }
+    "#);
+}
diff --git a/src/codegen/tests/oop_tests/super_tests.rs b/src/codegen/tests/oop_tests/super_tests.rs
index 82547ebb86..197afdfda9 100644
--- a/src/codegen/tests/oop_tests/super_tests.rs
+++ b/src/codegen/tests/oop_tests/super_tests.rs
@@ -1752,6 +1752,7 @@ fn super_with_structured_types() {
       %1 = bitcast %Complex_Type* %local_data to i8*
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %1, i8* align 1 bitcast (%Complex_Type* @__Complex_Type__init to i8*), i64 ptrtoint (%Complex_Type* getelementptr (%Complex_Type, %Complex_Type* null, i32 1) to i64), i1 false)
       call void @__init_complex_type(%Complex_Type* %local_data)
+      call void @__user_init_Complex_Type(%Complex_Type* %local_data)
       %x = getelementptr inbounds %Complex_Type, %Complex_Type* %local_data, i32 0, i32 0
       %data = getelementptr inbounds %parent, %parent* %__parent, i32 0, i32 0
       %x1 = getelementptr inbounds %Complex_Type, %Complex_Type* %data, i32 0, i32 0
@@ -1815,6 +1816,13 @@ fn super_with_structured_types() {
       ret void
     }
 
+    define void @__user_init_Complex_Type(%Complex_Type* %0) {
+    entry:
+      %self = alloca %Complex_Type*, align 8
+      store %Complex_Type* %0, %Complex_Type** %self, align 8
+      ret void
+    }
+
     define void @__user_init_child(%child* %0) {
     entry:
       %self = alloca %child*, align 8
@@ -1829,6 +1837,9 @@ fn super_with_structured_types() {
     entry:
       %self = alloca %parent*, align 8
       store %parent* %0, %parent** %self, align 8
+      %deref = load %parent*, %parent** %self, align 8
+      %data = getelementptr inbounds %parent, %parent* %deref, i32 0, i32 0
+      call void @__user_init_Complex_Type(%Complex_Type* %data)
       ret void
     }
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_var_nested_struct_added_to_debug_info.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_var_nested_struct_added_to_debug_info.snap
index 70eb4d745b..fc94f16178 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_var_nested_struct_added_to_debug_info.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_var_nested_struct_added_to_debug_info.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/debug_tests.rs
 expression: codegen
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -30,9 +31,27 @@ entry:
   ret void
 }
 
+define void @__user_init_myStruct(%myStruct* %0) {
+entry:
+  %self = alloca %myStruct*, align 8
+  store %myStruct* %0, %myStruct** %self, align 8
+  %deref = load %myStruct*, %myStruct** %self, align 8
+  %b = getelementptr inbounds %myStruct, %myStruct* %deref, i32 0, i32 1
+  call void @__user_init_myStruct2(%myStruct2* %b)
+  ret void
+}
+
+define void @__user_init_myStruct2(%myStruct2* %0) {
+entry:
+  %self = alloca %myStruct2*, align 8
+  store %myStruct2* %0, %myStruct2** %self, align 8
+  ret void
+}
+
 define void @__init___Test() {
 entry:
   call void @__init_mystruct(%myStruct* @gStruct)
+  call void @__user_init_myStruct(%myStruct* @gStruct)
   ret void
 }
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_var_struct_added_to_debug_info.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_var_struct_added_to_debug_info.snap
index 47f1a4af24..53d7ac7bcc 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_var_struct_added_to_debug_info.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_var_struct_added_to_debug_info.snap
@@ -1,6 +1,7 @@
 ---
 source: src/codegen/tests/debug_tests.rs
 expression: codegen
+snapshot_kind: text
 ---
 ; ModuleID = '<internal>'
 source_filename = "<internal>"
@@ -19,9 +20,17 @@ entry:
   ret void
 }
 
+define void @__user_init_myStruct(%myStruct* %0) {
+entry:
+  %self = alloca %myStruct*, align 8
+  store %myStruct* %0, %myStruct** %self, align 8
+  ret void
+}
+
 define void @__init___Test() {
 entry:
   call void @__init_mystruct(%myStruct* @gStruct)
+  call void @__user_init_myStruct(%myStruct* @gStruct)
   ret void
 }
 
diff --git a/src/lowering.rs b/src/lowering.rs
index d3c00eb627..ae9172252a 100644
--- a/src/lowering.rs
+++ b/src/lowering.rs
@@ -338,6 +338,9 @@ impl AstVisitorMut for InitVisitor {
 
     fn visit_data_type(&mut self, data_type: &mut DataType) {
         if matches!(data_type, plc_ast::ast::DataType::StructType { .. }) {
+            if let Some(name) = data_type.get_name() {
+                self.user_inits.insert(name.to_string(), false);
+            };
             self.walk_with_scope(data_type, data_type.get_name().map(ToOwned::to_owned))
         } else {
             data_type.walk(self)
diff --git a/src/tests/adr/initializer_functions_adr.rs b/src/tests/adr/initializer_functions_adr.rs
index 3a5b20efc1..0dc08c1cc2 100644
--- a/src/tests/adr/initializer_functions_adr.rs
+++ b/src/tests/adr/initializer_functions_adr.rs
@@ -507,6 +507,20 @@ fn generating_init_functions() {
       ret void
     }
 
+    define void @__user_init_myStruct(%myStruct* %0) {
+    entry:
+      %self = alloca %myStruct*, align 8
+      store %myStruct* %0, %myStruct** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_myRefStruct(%myRefStruct* %0) {
+    entry:
+      %self = alloca %myRefStruct*, align 8
+      store %myRefStruct* %0, %myRefStruct** %self, align 8
+      ret void
+    }
+
     define void @__init___Test() {
     entry:
       ret void
@@ -618,6 +632,16 @@ fn generating_init_functions() {
       ret void
     }
 
+    define void @__user_init_baz(%baz* %0) {
+    entry:
+      %self = alloca %baz*, align 8
+      store %baz* %0, %baz** %self, align 8
+      %deref = load %baz*, %baz** %self, align 8
+      %fb = getelementptr inbounds %baz, %baz* %deref, i32 0, i32 0
+      call void @__user_init_bar(%bar* %fb)
+      ret void
+    }
+
     define void @__user_init_bar(%bar* %0) {
     entry:
       %self = alloca %bar*, align 8
@@ -635,13 +659,10 @@ fn generating_init_functions() {
       ret void
     }
 
-    define void @__user_init_baz(%baz* %0) {
+    define void @__user_init_myStruct(%myStruct* %0) {
     entry:
-      %self = alloca %baz*, align 8
-      store %baz* %0, %baz** %self, align 8
-      %deref = load %baz*, %baz** %self, align 8
-      %fb = getelementptr inbounds %baz, %baz* %deref, i32 0, i32 0
-      call void @__user_init_bar(%bar* %fb)
+      %self = alloca %myStruct*, align 8
+      store %myStruct* %0, %myStruct** %self, align 8
       ret void
     }
 
@@ -650,6 +671,7 @@ fn generating_init_functions() {
       call void @__init_baz(%baz* @baz_instance)
       call void @__init_mystruct(%myStruct* @s)
       call void @__user_init_baz(%baz* @baz_instance)
+      call void @__user_init_myStruct(%myStruct* @s)
       ret void
     }
     "#);
diff --git a/tests/lit/single/init/user_init.st b/tests/lit/single/init/user_init.st
new file mode 100644
index 0000000000..30bc27f786
--- /dev/null
+++ b/tests/lit/single/init/user_init.st
@@ -0,0 +1,29 @@
+// RUN: (%COMPILE %s && %RUN) | %CHECK %s
+TYPE
+    bar : STRUCT
+        f: foo; 
+    END_STRUCT;
+END_TYPE
+
+FUNCTION_BLOCK foo
+VAR
+    x : INT := 0;
+    y : INT := 0;
+END_VAR
+    METHOD FB_INIT
+        x := 1;
+        y := 2;
+    END_METHOD
+END_FUNCTION_BLOCK
+
+PROGRAM prog 
+VAR 
+    str: bar;
+END_VAR
+    printf('%d$N', str.f.x); // CHECK: 1
+    printf('%d$N', str.f.y); // CHECK: 2
+END_PROGRAM
+
+FUNCTION main: DINT
+    prog();
+END_FUNCTION
\ No newline at end of file

From 48a095914bd509331f9f69315914e22a135c6ccc Mon Sep 17 00:00:00 2001
From: Michael Haselberger <Michael.HASELBERGER@bachmann.info>
Date: Wed, 16 Apr 2025 12:41:46 +0200
Subject: [PATCH 5/9] support external fb-inits

---
 src/codegen/generators/llvm.rs                |   5 ++-
 src/codegen/generators/pou_generator.rs       |   6 ++--
 .../complex_initializers.rs                   |   6 ++--
 src/lowering.rs                               |  29 ++++++++++++------
 src/lowering/initializers.rs                  |   4 +--
 ...r__conditional_return_evaluating_true.snap |   1 +
 ...tional_return_evaluating_true_negated.snap |   1 +
 .../extern_C_fb_init/extern_C_fb_init.test    |   2 ++
 tests/lit/multi/extern_C_fb_init/foo.c        |  14 +++++++++
 tests/lit/multi/extern_C_fb_init/header.pli   |   9 ++++++
 tests/lit/multi/extern_C_fb_init/libfoo.so    | Bin 0 -> 15448 bytes
 tests/lit/multi/extern_C_fb_init/main.st      |   7 +++++
 12 files changed, 64 insertions(+), 20 deletions(-)
 create mode 100644 tests/lit/multi/extern_C_fb_init/extern_C_fb_init.test
 create mode 100644 tests/lit/multi/extern_C_fb_init/foo.c
 create mode 100644 tests/lit/multi/extern_C_fb_init/header.pli
 create mode 100755 tests/lit/multi/extern_C_fb_init/libfoo.so
 create mode 100644 tests/lit/multi/extern_C_fb_init/main.st

diff --git a/src/codegen/generators/llvm.rs b/src/codegen/generators/llvm.rs
index 060634f224..424d6df7a5 100644
--- a/src/codegen/generators/llvm.rs
+++ b/src/codegen/generators/llvm.rs
@@ -12,7 +12,7 @@ use inkwell::{
     values::{BasicValue, BasicValueEnum, GlobalValue, IntValue, PointerValue},
     AddressSpace,
 };
-use plc_ast::ast::AstNode;
+use plc_ast::ast::{AstNode, LinkageType};
 use plc_diagnostics::diagnostics::Diagnostic;
 use plc_source::source_location::SourceLocation;
 
@@ -318,6 +318,9 @@ impl<'a> Llvm<'a> {
         exp_gen: &ExpressionCodeGenerator,
     ) -> Result<(), Diagnostic> {
         let (qualified_name, type_name, location) = variable;
+        if index.find_pou(type_name).is_some_and(|it| it.get_linkage() == &LinkageType::External) {
+            return Ok(());
+        }
         let variable_llvm_type =
             llvm_index.get_associated_type(type_name).map_err(|err| err.with_location(location))?;
 
diff --git a/src/codegen/generators/pou_generator.rs b/src/codegen/generators/pou_generator.rs
index b35c072b00..7fcc19d5ad 100644
--- a/src/codegen/generators/pou_generator.rs
+++ b/src/codegen/generators/pou_generator.rs
@@ -38,7 +38,7 @@ use inkwell::{
     types::{BasicType, StructType},
     values::PointerValue,
 };
-use plc_ast::ast::{AstNode, Implementation, PouType};
+use plc_ast::ast::{AstNode, Implementation, LinkageType, PouType};
 use plc_diagnostics::diagnostics::{Diagnostic, INTERNAL_LLVM_ERROR};
 use plc_source::source_location::SourceLocation;
 use rustc_hash::FxHashMap;
@@ -110,8 +110,8 @@ pub fn generate_global_constants_for_pou_members<'ink>(
         .filter(|it| it.is_in_unit(location));
     for implementation in implementations {
         let type_name = implementation.get_type_name();
-        if implementation.is_init() {
-            // initializer functions don't need global constants to initialize members
+        if implementation.is_init() || index.find_pou(type_name).is_some_and(|it| it.get_linkage() == &LinkageType::External) {
+            // initializer functions and externals don't need global constants to initialize members
             continue;
         }
         let pou_members = index.get_pou_members(type_name);
diff --git a/src/codegen/tests/initialization_test/complex_initializers.rs b/src/codegen/tests/initialization_test/complex_initializers.rs
index 213c6e0bbd..f31e571ce8 100644
--- a/src/codegen/tests/initialization_test/complex_initializers.rs
+++ b/src/codegen/tests/initialization_test/complex_initializers.rs
@@ -2368,12 +2368,10 @@ fn user_init_called_when_declared_as_external() {
         {external}
         FUNCTION_BLOCK foo
         VAR
-            x : INT := 0;
-            y : INT := 0;
+            x : INT;
+            y : INT;
         END_VAR
             METHOD FB_INIT
-                x := 1;
-                y := 2;
             END_METHOD
         END_FUNCTION_BLOCK
 
diff --git a/src/lowering.rs b/src/lowering.rs
index ae9172252a..c1270e515b 100644
--- a/src/lowering.rs
+++ b/src/lowering.rs
@@ -35,6 +35,11 @@ impl InitVisitor {
         init_symbol_name: &'static str,
     ) -> Vec<CompilationUnit> {
         let mut visitor = Self::new(index, unresolvables, id_provider);
+        // before visiting, we need to collect all candidates for user-defined init functions
+        units.iter().for_each(|unit| {
+            // TODO: probably also need to consider structs here
+            visitor.collect_user_init_candidates(unit);
+        });
         // visit all units
         units.iter_mut().for_each(|unit| {
             visitor.visit_compilation_unit(unit);
@@ -66,6 +71,15 @@ impl InitVisitor {
         self.ctxt.scope(old);
     }
 
+    fn collect_user_init_candidates(&mut self, unit: &CompilationUnit) {
+        // TODO: probably also need to consider structs here
+        // collect all candidates for user-defined init functions
+        for pou in unit.pous.iter().filter(|it| matches!(it.kind, PouType::FunctionBlock | PouType::Program)) {
+                // add the POU to potential `FB_INIT` candidates
+                self.user_inits.insert(pou.name.to_owned(), self.index.find_method(&pou.name, "FB_INIT").is_some());
+        }
+    }
+
     fn update_initializer(&mut self, variable: &mut plc_ast::ast::Variable) {
         // flat references to stateful pou-local variables need to have a qualifier added, so they can be resolved in the init functions
         let scope = self.ctxt.get_scope().as_ref().map(|it| it.as_str()).unwrap_or(GLOBAL_SCOPE);
@@ -219,11 +233,12 @@ impl InitVisitor {
         // collect necessary call statements to init-functions and user-defined init-functions
         let mut implicit_calls = Vec::new();
         let mut user_init_calls = Vec::new();
-        self.index.get_pou_members(&implementation.name).iter().filter(|var| predicate(var)).for_each(
+        self.index.get_pou_members(dbg!(&implementation.name)).iter().filter(|var| predicate(var)).for_each(
             |var| {
                 let dti =
                     self.index.get_effective_type_or_void_by_name(var.get_type_name()).get_type_information();
-                if dti.is_struct() {
+                let is_external = self.index.find_pou(dti.get_name()).is_some_and(|it| it.get_linkage() == &LinkageType::External);
+                if dti.is_struct() && !is_external {
                     implicit_calls.push(create_call_statement(
                         &get_init_fn_name(dti.get_name()),
                         var.get_name(),
@@ -232,9 +247,9 @@ impl InitVisitor {
                         &implementation.name_location,
                     ));
                 }
-                if self.user_inits.contains_key(dti.get_name()) {
+                if dbg!(&self.user_inits).contains_key(dbg!(dti.get_name())) {
                     user_init_calls.push(create_call_statement(
-                        &get_user_init_fn_name(dti.get_name()),
+                        dbg!(&get_user_init_fn_name(dti.get_name())),
                         var.get_name(),
                         None,
                         self.ctxt.get_id_provider(),
@@ -352,12 +367,6 @@ impl AstVisitorMut for InitVisitor {
             self.unresolved_initializers.maybe_insert_initializer(&pou.name, None, &None);
         }
 
-        if matches!(pou.kind, PouType::FunctionBlock | PouType::Program) {
-            // add the POU to potential `FB_INIT` candidates
-            self.user_inits
-                .insert(pou.name.to_owned(), self.index.find_method(&pou.name, "fb_init").is_some());
-        }
-
         self.walk_with_scope(pou, Some(&pou.name.to_owned()));
     }
 }
diff --git a/src/lowering/initializers.rs b/src/lowering/initializers.rs
index 45e76eecb5..01c971a068 100644
--- a/src/lowering/initializers.rs
+++ b/src/lowering/initializers.rs
@@ -230,8 +230,8 @@ fn create_init_unit(
 }
 
 fn create_user_init_units(lowerer: &InitVisitor) -> Vec<CompilationUnit> {
-    lowerer
-        .user_inits
+    dbg!(&lowerer
+                .user_inits)
         .iter()
         .map(|(container_name, has_fb_init)| {
             let location = SourceLocation::internal_in_unit(Some(INIT_COMPILATION_UNIT));
diff --git a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true.snap b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true.snap
index 6c5202c5ef..740b1fac16 100644
--- a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true.snap
+++ b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true.snap
@@ -18,6 +18,7 @@ entry:
   call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 bitcast (%conditional_return* @__conditional_return__init to i8*), i64 ptrtoint (%conditional_return* getelementptr (%conditional_return, %conditional_return* null, i32 1) to i64), i1 false)
   store i32 0, i32* %main, align 4
   call void @__init_conditional_return(%conditional_return* %conditional)
+  call void @__user_init_conditional_return(%conditional_return* %conditional)
   %val = getelementptr inbounds %conditional_return, %conditional_return* %conditional, i32 0, i32 0
   %load_my_val = load i32, i32* %my_val, align 4
   store i32 %load_my_val, i32* %val, align 4
diff --git a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true_negated.snap b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true_negated.snap
index cbe9d93a93..9555be0e52 100644
--- a/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true_negated.snap
+++ b/tests/integration/snapshots/tests__integration__cfc__ir__conditional_return_evaluating_true_negated.snap
@@ -18,6 +18,7 @@ entry:
   call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 bitcast (%conditional_return* @__conditional_return__init to i8*), i64 ptrtoint (%conditional_return* getelementptr (%conditional_return, %conditional_return* null, i32 1) to i64), i1 false)
   store i32 0, i32* %main, align 4
   call void @__init_conditional_return(%conditional_return* %conditional)
+  call void @__user_init_conditional_return(%conditional_return* %conditional)
   %val = getelementptr inbounds %conditional_return, %conditional_return* %conditional, i32 0, i32 0
   %load_my_val = load i32, i32* %my_val, align 4
   store i32 %load_my_val, i32* %val, align 4
diff --git a/tests/lit/multi/extern_C_fb_init/extern_C_fb_init.test b/tests/lit/multi/extern_C_fb_init/extern_C_fb_init.test
new file mode 100644
index 0000000000..500cf2a326
--- /dev/null
+++ b/tests/lit/multi/extern_C_fb_init/extern_C_fb_init.test
@@ -0,0 +1,2 @@
+RUN: %COMPILE %S/main.st %S/header.pli && %RUN | %CHECK %s
+CHECK:6
\ No newline at end of file
diff --git a/tests/lit/multi/extern_C_fb_init/foo.c b/tests/lit/multi/extern_C_fb_init/foo.c
new file mode 100644
index 0000000000..658bcb6c84
--- /dev/null
+++ b/tests/lit/multi/extern_C_fb_init/foo.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+typedef struct {
+    int a;
+    int b;
+} myFunctionBlock;
+
+// myFunctionBlock __myFunctionBlock__init;
+
+void myFunctionBlock_FB_INIT(myFunctionBlock* fb_instance) {
+    fb_instance->a = 1;
+    fb_instance->b = 2;
+    printf("myFunctionBlock initialized with a = %d, b = %d\n", fb_instance->a, fb_instance->b);
+}
\ No newline at end of file
diff --git a/tests/lit/multi/extern_C_fb_init/header.pli b/tests/lit/multi/extern_C_fb_init/header.pli
new file mode 100644
index 0000000000..25a81fe17a
--- /dev/null
+++ b/tests/lit/multi/extern_C_fb_init/header.pli
@@ -0,0 +1,9 @@
+{external}
+FUNCTION_BLOCK myFunctionBlock
+VAR
+    a : DINT;
+    b : DINT;
+END_VAR
+    METHOD FB_INIT
+    END_METHOD
+END_FUNCTION_BLOCK
\ No newline at end of file
diff --git a/tests/lit/multi/extern_C_fb_init/libfoo.so b/tests/lit/multi/extern_C_fb_init/libfoo.so
new file mode 100755
index 0000000000000000000000000000000000000000..e1314fb78fa1deeb1995a1b7010acd6143f734ee
GIT binary patch
literal 15448
zcmeHOUu+!38K1j2a3M~7K$4~jG)t5qLX*XIoHQ*pIoq+bMotLE7KzlbtZ&c0EB7b8
z+aorDkYcqoO(R9BcmW>ZE${+@Ct47RKp_Gig2V$zMT$ft83~0T1h}n~>-WvfZ@pg5
zC=wF9%t*K2-`_Xiemi%wdpq-Z|Ik1(kq~H$#9d-e5+b7w`?tY^bvwioI^HDKO5c__
z(|5R2+6XGr%7yz_%&eB<)YD0T!p>?L(qb?*OCCe|p%y`-xNFEZyG1$7cF(7)lS;NU
z1&&3=rEFzS-8G+{)_H=alv(D;dG65h;&g-d1C{4Qx_uV|pZP9JIm9XaL4muMaGdAW
zHk5r>_qR}8QaXQ7eY*1eR#0b)=(Bt8sQBZ)<hI9e{h+-5o7bnmPOMvYDfRqX&IR>j
zT$o=f6Y}4#d1;#c7HXWQ)x=mL-3?9j+>g~nzj*=u0O{8^@gF7K4Wd<~uUE!i__*#w
zsZw@pfmaP&SGa>Cdt5(P%}o?)L9RNor>|Hk=SIA-VouqbTiooV=Z+W3Ua{~<PL!qw
z>g8-usFZt)mFz?AK(9NvcW^`;sus$@xF{CJvUaUvZx_3V27CM5PP^0QuVaF$n+T5y
z5s(howZ5jXgsXo<=Z*1>@hS9q(bruz=uhhabcyEaA)ni+^n5M3)@bJ=dL9#KA4T*S
zt8BXv(aYZf05XcXmWUpDuo!A8U@BlLU@BlLU@BlLU@BlLU@GtfEAUm@FaGOHf1YxV
zFFtdJ5YC@Y2g$~HXZr2bTQYKE+q<N0Y<!=NZR;|`v7BeyXBQgOHa<=A_(`PUoalay
z6wZmouQ2)bY_O6-KfpYNUedVGw(cnVzNIPoACvyuo?x=+igWC;bLP@c=gjOPCvn#K
z;7YK90&LL%QjH7aZR>W;;W_`K-Th=1^<R!U)7{rG>m0inv^vMTZzW;o0A)Gj)8Xvm
zn@LU_q`t%c8UNW~GU|Lr2}<=yJI5ZIb&mJXz9XM<B$sL72NGtFx69+c7Rvsg%Y}GZ
z%>4UGqd`?mAEdH{H4UpsIMYl8Oa)8@Oa)8@Oa)8@Oa)8@Oa)8@Oa)8@e!>dGUOifc
zav><lx01efxDezm&+4`|`kSpWNw4En6KfaUX%Xf3e4l^OX#AFF>*YqnC;Bg<j}ql~
z!`u>&42#5MI<dC(+SEyUVYq>GH__)5;VhzJd3s>^>bu*P9!?z<JJ;NK`_>Kebu8oQ
zF<(4Ket0*@?u`8%efCp7@||qY^7NmReao(Sj5=Tk(@X_S1xy7@1xy7@1xy7@1xy7@
z1xy7@1?E>kum8k)PpswSHKg2H6$uxVF4OXe#{FE&SXU|+`;rdNU~7Qa>r45$jT`J=
zUujfWeo!y+#2V0ceyF5|wZebVcKP5*`oBu65KA>(t*M5I8NIGl!vySj9_4kV+<vBr
zIN72Y=x1~w<atW_(PCQJ5RYE>%KXo1e|m!~Wz>-#Po?}1ZU2v!k*5y#qY<oIk9W8|
zw%&JlU*B)6+eXLg<)ChLY_+%A?OV3jrPz6-v&(Mp+N9M&J7tSrdBS=)SFO?dWvgR{
z-C=LFZtGB(j!p3nV=~vPMSR(aspa@f(s3UaG;0TX+fM6(TgB0s{uZsrct*Tm5tE>+
zoz5r?u1}xT(+YAuK9yC7-xI^}!}ZbH@UZm1USPb#|0!ac<-gE*JuBm+#d!-6=4i7x
zFOoSamI-|C;QcZ&39(9~GSDdchSc9E;@A7EG`EHO3V`}p`mYM>1N}v*Um1R%p#L8+
zN!tA(V)f@OBo>?^^k&jGTc_W?fd5YE|J`->_b=f82hy*P^cS+(YETR6<KuQ#%q`D%
zgOZ!&1^PANx_-r-C|1V2qU#5hYR&cPlOkIw9V+I6oNu=`_uxhQ1=p)qy(u?W4ysdP
zyy}&5u3s;erU(*|T>dX@o@<b+1(c8L4h;9~>3940?&2K;9FaS#RouK+_IcyLt^<2}
z_6+usmiAV-{f-7WyM{?cdkg^GJ#<fR&yai1z`%X|Bko8~?@&Jl<bJ<*V}jaOkcsXl
zh;3_#{Vf>oNRZndu3}5Wyx797O_c&~jA&3*G!L#^33B#Cxo(fu3q^lR!531>d$qi<
z{i!k`6%DG&qJL=S2`<^HxuVAa%^fNR!j^@wiM1yxBnG)jI?8g})r#*0p0IOyeaZ4Z
z1%afX>e?v;c<R9`6|&TQCE&=EoQyM8s|lM%Pl*OaI0k<J!}Do$55z+IhtP$d#vlsb
zuJjGfIhY3@)C?&956cbn5#~FkrF~1p@Ei*~=3!9Gi`*}L1;cqA^J9i|92<Dd>!6s&
z$wfAf5p50$Jf{MWc@&iA0dB}2exSU6hv#U>n5RK422+dYue3t=+6FxC3qW!H=pXgN
z`Ij}mR|mv>1}OX(zmh(2{3PkPCb$m@e{c2gF7CI;MK(T<XseMB#akK|(x@}>_&EnX
z62oV-0TlTn3}nzJV|dKtpvl+;N56=7B8JEO2a5Yq_{Y!x?;76;2TL=Wc0jKw(gA&j
z^vvV>cUj62bb}JZW4!+t$P&fxx0EaBqaji;s2kL;62oI0;|up4*rylwhYb2AVcR13
z@IHrs7^uNdNpmvv?~#GW9{R`q1olCm)`h}(1BdJQ1Yy|)c<dWHcLyn{S@Jk{03P&1
zGDY#Yub;U}{3kIy?vqmOs!#NT4C3;qWMCcg$Ngh^0lY2;!igE;Sf|}XJ@CV!Mlrxg
zDaKyZHLn96(nfyH;%6J=kKYx3UP10r{73o=@i%m&jWJQ){x-w=T?+7JG$`?L{Qm)M
CJal>h

literal 0
HcmV?d00001

diff --git a/tests/lit/multi/extern_C_fb_init/main.st b/tests/lit/multi/extern_C_fb_init/main.st
new file mode 100644
index 0000000000..d494bce9c7
--- /dev/null
+++ b/tests/lit/multi/extern_C_fb_init/main.st
@@ -0,0 +1,7 @@
+FUNCTION main 
+VAR 
+    f: myFunctionBlock;
+END_VAR
+    printf('%d$N', f.a);
+    printf('%d$N', f.b);
+END_FUNCTION
\ No newline at end of file

From 47400543db7de5871746f62370d8e2e08039cbff Mon Sep 17 00:00:00 2001
From: Michael Haselberger <Michael.HASELBERGER@bachmann.info>
Date: Tue, 22 Apr 2025 08:24:26 +0200
Subject: [PATCH 6/9] add lit test for external lib fb init

---
 src/codegen/generators/pou_generator.rs       |  4 ++-
 .../complex_initializers.rs                   | 31 ++++++++++++-------
 src/lowering.rs                               | 19 +++++++-----
 src/lowering/initializers.rs                  |  4 +--
 .../extern_C_fb_init/extern_C_fb_init.test    |  6 ++--
 .../lit/multi/extern_C_fb_init/lit.local.cfg  | 29 +++++++++++++++++
 6 files changed, 69 insertions(+), 24 deletions(-)
 create mode 100644 tests/lit/multi/extern_C_fb_init/lit.local.cfg

diff --git a/src/codegen/generators/pou_generator.rs b/src/codegen/generators/pou_generator.rs
index 7fcc19d5ad..4f474674e7 100644
--- a/src/codegen/generators/pou_generator.rs
+++ b/src/codegen/generators/pou_generator.rs
@@ -110,7 +110,9 @@ pub fn generate_global_constants_for_pou_members<'ink>(
         .filter(|it| it.is_in_unit(location));
     for implementation in implementations {
         let type_name = implementation.get_type_name();
-        if implementation.is_init() || index.find_pou(type_name).is_some_and(|it| it.get_linkage() == &LinkageType::External) {
+        if implementation.is_init()
+            || index.find_pou(type_name).is_some_and(|it| it.get_linkage() == &LinkageType::External)
+        {
             // initializer functions and externals don't need global constants to initialize members
             continue;
         }
diff --git a/src/codegen/tests/initialization_test/complex_initializers.rs b/src/codegen/tests/initialization_test/complex_initializers.rs
index f31e571ce8..857e3c94bf 100644
--- a/src/codegen/tests/initialization_test/complex_initializers.rs
+++ b/src/codegen/tests/initialization_test/complex_initializers.rs
@@ -2118,10 +2118,10 @@ fn methods_call_init_functions_for_their_members() {
 
 #[test]
 fn user_fb_init_is_added_and_called_if_it_exists() {
-  let res = generate_to_string(
-    "Test",
-    vec![SourceCode::from(
-        r#"
+    let res = generate_to_string(
+        "Test",
+        vec![SourceCode::from(
+            r#"
         FUNCTION_BLOCK foo
         VAR
             x : INT := 0;
@@ -2225,16 +2225,20 @@ fn user_fb_init_is_added_and_called_if_it_exists() {
 
 #[test]
 fn user_fb_init_in_global_struct() {
-  let res = generate_to_string(
-    "Test",
-    vec![SourceCode::from(
-        r#"
+    let res = generate_to_string(
+        "Test",
+        vec![SourceCode::from(
+            r#"
         TYPE
             bar : STRUCT
                f: foo; 
             END_STRUCT;
         END_TYPE
 
+        VAR_GLOBAL
+            str: bar;
+        END_VAR
+
         FUNCTION_BLOCK foo
         VAR
             x : INT := 0;
@@ -2269,6 +2273,7 @@ fn user_fb_init_in_global_struct() {
     @prog_instance = global %prog zeroinitializer
     @__bar__init = constant %bar zeroinitializer
     @__foo__init = constant %foo zeroinitializer
+    @str = global %bar zeroinitializer
 
     define void @foo(%foo* %0) {
     entry:
@@ -2353,7 +2358,9 @@ fn user_fb_init_in_global_struct() {
     define void @__init___Test() {
     entry:
       call void @__init_prog(%prog* @prog_instance)
+      call void @__init_bar(%bar* @str)
       call void @__user_init_prog(%prog* @prog_instance)
+      call void @__user_init_bar(%bar* @str)
       ret void
     }
     "#);
@@ -2361,10 +2368,10 @@ fn user_fb_init_in_global_struct() {
 
 #[test]
 fn user_init_called_when_declared_as_external() {
-  let res = generate_to_string(
-    "Test",
-    vec![SourceCode::from(
-        r#"
+    let res = generate_to_string(
+        "Test",
+        vec![SourceCode::from(
+            r#"
         {external}
         FUNCTION_BLOCK foo
         VAR
diff --git a/src/lowering.rs b/src/lowering.rs
index c1270e515b..c0d0d16ff7 100644
--- a/src/lowering.rs
+++ b/src/lowering.rs
@@ -74,9 +74,11 @@ impl InitVisitor {
     fn collect_user_init_candidates(&mut self, unit: &CompilationUnit) {
         // TODO: probably also need to consider structs here
         // collect all candidates for user-defined init functions
-        for pou in unit.pous.iter().filter(|it| matches!(it.kind, PouType::FunctionBlock | PouType::Program)) {
-                // add the POU to potential `FB_INIT` candidates
-                self.user_inits.insert(pou.name.to_owned(), self.index.find_method(&pou.name, "FB_INIT").is_some());
+        for pou in unit.pous.iter().filter(|it| matches!(it.kind, PouType::FunctionBlock | PouType::Program))
+        {
+            // add the POU to potential `FB_INIT` candidates
+            self.user_inits
+                .insert(pou.name.to_owned(), self.index.find_method(&pou.name, "FB_INIT").is_some());
         }
     }
 
@@ -233,11 +235,14 @@ impl InitVisitor {
         // collect necessary call statements to init-functions and user-defined init-functions
         let mut implicit_calls = Vec::new();
         let mut user_init_calls = Vec::new();
-        self.index.get_pou_members(dbg!(&implementation.name)).iter().filter(|var| predicate(var)).for_each(
+        self.index.get_pou_members(&implementation.name).iter().filter(|var| predicate(var)).for_each(
             |var| {
                 let dti =
                     self.index.get_effective_type_or_void_by_name(var.get_type_name()).get_type_information();
-                let is_external = self.index.find_pou(dti.get_name()).is_some_and(|it| it.get_linkage() == &LinkageType::External);
+                let is_external = self
+                    .index
+                    .find_pou(dti.get_name())
+                    .is_some_and(|it| it.get_linkage() == &LinkageType::External);
                 if dti.is_struct() && !is_external {
                     implicit_calls.push(create_call_statement(
                         &get_init_fn_name(dti.get_name()),
@@ -247,9 +252,9 @@ impl InitVisitor {
                         &implementation.name_location,
                     ));
                 }
-                if dbg!(&self.user_inits).contains_key(dbg!(dti.get_name())) {
+                if self.user_inits.contains_key(dti.get_name()) {
                     user_init_calls.push(create_call_statement(
-                        dbg!(&get_user_init_fn_name(dti.get_name())),
+                        &get_user_init_fn_name(dti.get_name()),
                         var.get_name(),
                         None,
                         self.ctxt.get_id_provider(),
diff --git a/src/lowering/initializers.rs b/src/lowering/initializers.rs
index 01c971a068..45e76eecb5 100644
--- a/src/lowering/initializers.rs
+++ b/src/lowering/initializers.rs
@@ -230,8 +230,8 @@ fn create_init_unit(
 }
 
 fn create_user_init_units(lowerer: &InitVisitor) -> Vec<CompilationUnit> {
-    dbg!(&lowerer
-                .user_inits)
+    lowerer
+        .user_inits
         .iter()
         .map(|(container_name, has_fb_init)| {
             let location = SourceLocation::internal_in_unit(Some(INIT_COMPILATION_UNIT));
diff --git a/tests/lit/multi/extern_C_fb_init/extern_C_fb_init.test b/tests/lit/multi/extern_C_fb_init/extern_C_fb_init.test
index 500cf2a326..0743e3f4ed 100644
--- a/tests/lit/multi/extern_C_fb_init/extern_C_fb_init.test
+++ b/tests/lit/multi/extern_C_fb_init/extern_C_fb_init.test
@@ -1,2 +1,4 @@
-RUN: %COMPILE %S/main.st %S/header.pli && %RUN | %CHECK %s
-CHECK:6
\ No newline at end of file
+RUN: %COMPILE %S/main.st && %RUN | %CHECK %s
+CHECK: myFunctionBlock initialized with a = 1, b = 2
+CHECK: 1
+CHECK: 2
\ No newline at end of file
diff --git a/tests/lit/multi/extern_C_fb_init/lit.local.cfg b/tests/lit/multi/extern_C_fb_init/lit.local.cfg
new file mode 100644
index 0000000000..bbac64e691
--- /dev/null
+++ b/tests/lit/multi/extern_C_fb_init/lit.local.cfg
@@ -0,0 +1,29 @@
+# Override the compile command to include the custom library
+import os.path
+
+# Access the same parameters that the main configuration uses
+stdlibLocation = lit_config.params["LIB"]
+compilerLocation = lit_config.params["COMPILER"]
+rustyRootDirectory = "/home/michael/dev/rusty"
+
+test_dir = os.path.dirname(__file__)
+lib_path = os.path.abspath(test_dir)
+
+# Build on the existing compile command but add our custom library
+compile = f'{compilerLocation}'
+compile = f'{compile} -o /tmp/%basename_t.out'
+compile = f'{compile} -liec61131std -L{stdlibLocation}/lib -i "{stdlibLocation}/include/*.st"'
+compile = f'{compile} -i "{rustyRootDirectory}/tests/lit/util/*.pli"'
+compile = f'{compile} -L{lib_path} -lfoo -i {lib_path}/header.pli'
+compile = f'{compile} --linker=cc'
+
+# Log the compile command
+lit_config.note(f"Compile command: {compile}")
+
+# Update the run command to include the custom library path
+run_cmd = f'LD_LIBRARY_PATH="{stdlibLocation}/lib:{lib_path}" /tmp/%basename_t.out'
+
+# Override the substitutions
+config.substitutions = [s for s in config.substitutions if s[0] not in ['%COMPILE', '%RUN']]
+config.substitutions.append(('%COMPILE', f'{compile}'))
+config.substitutions.append(('%RUN', f'{run_cmd}'))
\ No newline at end of file

From 8c9f120a0c1b0fcab89139657c4247de6ac3d6ea Mon Sep 17 00:00:00 2001
From: Michael Haselberger <Michael.HASELBERGER@bachmann.info>
Date: Tue, 22 Apr 2025 09:26:06 +0200
Subject: [PATCH 7/9] update book

---
 book/src/libraries/api_lib_guide.md           |  65 +++++++++++++++++-
 book/src/pous.md                              |  22 ++++++
 book/src/using_rusty.md                       |  26 +++++++
 compiler/plc_project/src/project.rs           |   2 +-
 src/codegen/generators/llvm.rs                |   5 +-
 src/codegen/generators/pou_generator.rs       |   8 +--
 src/lowering.rs                               |  14 ++--
 tests/lit/multi/extern_C_fb_init/foo.c        |   2 +-
 tests/lit/multi/extern_C_fb_init/libfoo.so    | Bin 15448 -> 0 bytes
 .../lit/multi/extern_C_fb_init/lit.local.cfg  |  26 +++++--
 10 files changed, 147 insertions(+), 23 deletions(-)
 delete mode 100755 tests/lit/multi/extern_C_fb_init/libfoo.so

diff --git a/book/src/libraries/api_lib_guide.md b/book/src/libraries/api_lib_guide.md
index 880316beaf..15d15acb51 100644
--- a/book/src/libraries/api_lib_guide.md
+++ b/book/src/libraries/api_lib_guide.md
@@ -142,8 +142,6 @@ void Count(CountStruct* countInst) {
 }
 ```
 
-
-
 #### 2.2.3 Return values
 
 A `FUNCTION` defines a return value in the signature, while a `FUNCTION_BLOCK` relies on `VAR_OUTPUT` definitions.
@@ -334,6 +332,67 @@ pub struct myStruct {
 ```
 
 ### 2.5 `FUNCTION_BLOCK` initialization
-Not yet implemented.
+
+When creating a library with `FUNCTION_BLOCK`s, you can implement initialization logic that runs when an instance is created. 
+
+For more details on `FB_INIT` in IEC61131-3, refer to the [Program Organization Units (POUs)](../pous.md#function_block-initialization) documentation.
+
+#### Interoperability with libraries written in other languages
+
+When implementing a `FUNCTION_BLOCK` with initialization in C or other languages, you need to follow a specific naming convention for the initialization function.
+
+For a C implementation:
+
+1. Define a struct that matches your `FUNCTION_BLOCK` variables:
+
+```c
+typedef struct {
+    int a;
+    int b;
+    // Other members as needed
+} myFunctionBlock;
+```
+
+2. ruSTy expects a default-initializer to be present to initialize instances on the stack
+(`VAR_TEMP` blocks or `VAR` blocks in functions or methods)
+
+This global instance follows the naming scheme of `__<FunctionBlockName>__init`, below is an example of a zero-initializer:
+
+```c
+myFunctionBlock __myFunctionBlock__init = { 0 };
+```
+
+3. Optionally create an initialization function following the naming pattern `<FunctionBlockName>_FB_INIT`:
+
+```c
+void myFunctionBlock_FB_INIT(myFunctionBlock* fb_instance) {
+    // Initialize members here
+    fb_instance->a = 1;
+    fb_instance->b = 2;
+    
+    // ...perform any other needed initialization
+}
+```
+
+4. In your IEC61131-3 declaration (e.g., in a header file [`*.pli`]), ensure your `FUNCTION_BLOCK` includes the `FB_INIT` method (if present):
+
+```
+{external}
+FUNCTION_BLOCK myFunctionBlock
+VAR
+    a : DINT;
+    b : DINT;
+END_VAR
+    METHOD FB_INIT
+    END_METHOD
+END_FUNCTION_BLOCK
+```
+
+Note that the `FB_INIT` method doesn't need implementation details in the IEC61131-3 declaration when using an external implementation - the declaration just signals that initialization is available.
+
+#### Project-wide initialization
+
+See [Project-wide initialization](../using_rusty.md#project-wide-initialization)
+
 
 
diff --git a/book/src/pous.md b/book/src/pous.md
index d923d74fe0..9222b0dc9f 100644
--- a/book/src/pous.md
+++ b/book/src/pous.md
@@ -147,6 +147,28 @@ END_VAR
 END_FUNCTION_BLOCK
 ```
 
+#### `FUNCTION_BLOCK` initialization
+Function blocks can define a special method called `FB_INIT` that is automatically called when an instance is created. This is analogous to a constructor in object-oriented programming.
+
+The `FB_INIT` method allows you to initialize the function block's variables to specific values. It is called during program initialization before any other code runs.
+
+`FB_INIT` methods can neither have parameters nor a return type in their current implementation - violating this contract will lead to undefined behaviour at runtime.
+
+```iecst
+FUNCTION_BLOCK MyFB
+VAR
+    x : INT;
+    y : INT;
+END_VAR
+    METHOD FB_INIT
+        x := 1;
+        y := 2;
+    END_METHOD
+
+    // Other methods and code...
+END_FUNCTION_BLOCK
+```
+
 ### Action
 
 An action is represented by a parent struct, and does not define its own interface (VAR blocks).
diff --git a/book/src/using_rusty.md b/book/src/using_rusty.md
index a9623987d8..042040bafa 100644
--- a/book/src/using_rusty.md
+++ b/book/src/using_rusty.md
@@ -136,3 +136,29 @@ Outputs the json schema used for the validation of the `plc.json` file
 Ouputs a json file with the default error severity configuration for the project.
 See [Error Configuration](./error_configuration.md) for more information.
 
+## Project-wide initialization
+
+When your code is compiled, the compiler creates a special initialization function with the naming pattern `__init___<projectname>`. This function is responsible for calling all implicit and user-defined initialization code, including all [`FB_INIT`](../pous.md#function_block-initialization) methods.
+
+`<projectname>` is either taken directly from the `plc.json`'s `name` field or derived from the first input file (replacing `.`/`-` with `_`) when compiling without a `plc.json` (e.g. `plc prog.st ...` would yield `__init___prog_st`).
+
+This function is added to the global constructor list, therefore loading the binary will automatically call the `__init___<projectname>` function (and therefore your `<FunctionBlockName>_FB_INIT` function) when an instance of your function block is created, before any other methods are called. This allows you to set default values or perform required setup for your function block.
+
+> **IMPORTANT:** The global constructor initialization is currently only supported for `x86` ISAs. To make sure initialization code runs reliably regardless of target-architecture, ensure your runtime calls this function before starting main task execution.
+If you're using the executable without a runtime, you **must** ensure that `__init___<projectname>` is called before any other code runs. Failure to do so will result in uninitialized function blocks and pointers, which can lead to undefined behavior and/or crashes.
+
+Example of ensuring initialization when using C (crt0):
+
+```c
+int main() {
+    // Call the project initialization function first
+    __init___myproject();
+    
+    // Now it's safe to start cyclic execution
+    for (;;) {
+        mainProg();
+    }
+    
+    return 0;
+}
+```
\ No newline at end of file
diff --git a/compiler/plc_project/src/project.rs b/compiler/plc_project/src/project.rs
index 1d617d87da..5cca51c62c 100644
--- a/compiler/plc_project/src/project.rs
+++ b/compiler/plc_project/src/project.rs
@@ -302,7 +302,7 @@ impl<S: SourceContainer> Project<S> {
     /// Returns the symbol name of this projects main initializer function
     pub fn get_init_symbol_name(&self) -> &'static str {
         //Converts into static because this will live forever
-        format!("__init___{}", self.get_name().replace('.', "_")).leak()
+        format!("__init___{}", self.get_name().replace(['.', '-'], "_")).leak()
     }
 }
 
diff --git a/src/codegen/generators/llvm.rs b/src/codegen/generators/llvm.rs
index 424d6df7a5..060634f224 100644
--- a/src/codegen/generators/llvm.rs
+++ b/src/codegen/generators/llvm.rs
@@ -12,7 +12,7 @@ use inkwell::{
     values::{BasicValue, BasicValueEnum, GlobalValue, IntValue, PointerValue},
     AddressSpace,
 };
-use plc_ast::ast::{AstNode, LinkageType};
+use plc_ast::ast::AstNode;
 use plc_diagnostics::diagnostics::Diagnostic;
 use plc_source::source_location::SourceLocation;
 
@@ -318,9 +318,6 @@ impl<'a> Llvm<'a> {
         exp_gen: &ExpressionCodeGenerator,
     ) -> Result<(), Diagnostic> {
         let (qualified_name, type_name, location) = variable;
-        if index.find_pou(type_name).is_some_and(|it| it.get_linkage() == &LinkageType::External) {
-            return Ok(());
-        }
         let variable_llvm_type =
             llvm_index.get_associated_type(type_name).map_err(|err| err.with_location(location))?;
 
diff --git a/src/codegen/generators/pou_generator.rs b/src/codegen/generators/pou_generator.rs
index 4f474674e7..b35c072b00 100644
--- a/src/codegen/generators/pou_generator.rs
+++ b/src/codegen/generators/pou_generator.rs
@@ -38,7 +38,7 @@ use inkwell::{
     types::{BasicType, StructType},
     values::PointerValue,
 };
-use plc_ast::ast::{AstNode, Implementation, LinkageType, PouType};
+use plc_ast::ast::{AstNode, Implementation, PouType};
 use plc_diagnostics::diagnostics::{Diagnostic, INTERNAL_LLVM_ERROR};
 use plc_source::source_location::SourceLocation;
 use rustc_hash::FxHashMap;
@@ -110,10 +110,8 @@ pub fn generate_global_constants_for_pou_members<'ink>(
         .filter(|it| it.is_in_unit(location));
     for implementation in implementations {
         let type_name = implementation.get_type_name();
-        if implementation.is_init()
-            || index.find_pou(type_name).is_some_and(|it| it.get_linkage() == &LinkageType::External)
-        {
-            // initializer functions and externals don't need global constants to initialize members
+        if implementation.is_init() {
+            // initializer functions don't need global constants to initialize members
             continue;
         }
         let pou_members = index.get_pou_members(type_name);
diff --git a/src/lowering.rs b/src/lowering.rs
index c0d0d16ff7..e9a0e533c2 100644
--- a/src/lowering.rs
+++ b/src/lowering.rs
@@ -37,7 +37,6 @@ impl InitVisitor {
         let mut visitor = Self::new(index, unresolvables, id_provider);
         // before visiting, we need to collect all candidates for user-defined init functions
         units.iter().for_each(|unit| {
-            // TODO: probably also need to consider structs here
             visitor.collect_user_init_candidates(unit);
         });
         // visit all units
@@ -72,7 +71,6 @@ impl InitVisitor {
     }
 
     fn collect_user_init_candidates(&mut self, unit: &CompilationUnit) {
-        // TODO: probably also need to consider structs here
         // collect all candidates for user-defined init functions
         for pou in unit.pous.iter().filter(|it| matches!(it.kind, PouType::FunctionBlock | PouType::Program))
         {
@@ -80,6 +78,15 @@ impl InitVisitor {
             self.user_inits
                 .insert(pou.name.to_owned(), self.index.find_method(&pou.name, "FB_INIT").is_some());
         }
+
+        for user_type in
+            unit.user_types.iter().filter(|it| matches!(it.data_type, DataType::StructType { .. }))
+        {
+            // add the struct to potential `STRUCT_INIT` candidates
+            if let Some(name) = user_type.data_type.get_name() {
+                self.user_inits.insert(name.to_string(), false);
+            };
+        }
     }
 
     fn update_initializer(&mut self, variable: &mut plc_ast::ast::Variable) {
@@ -358,9 +365,6 @@ impl AstVisitorMut for InitVisitor {
 
     fn visit_data_type(&mut self, data_type: &mut DataType) {
         if matches!(data_type, plc_ast::ast::DataType::StructType { .. }) {
-            if let Some(name) = data_type.get_name() {
-                self.user_inits.insert(name.to_string(), false);
-            };
             self.walk_with_scope(data_type, data_type.get_name().map(ToOwned::to_owned))
         } else {
             data_type.walk(self)
diff --git a/tests/lit/multi/extern_C_fb_init/foo.c b/tests/lit/multi/extern_C_fb_init/foo.c
index 658bcb6c84..47f2db666e 100644
--- a/tests/lit/multi/extern_C_fb_init/foo.c
+++ b/tests/lit/multi/extern_C_fb_init/foo.c
@@ -5,7 +5,7 @@ typedef struct {
     int b;
 } myFunctionBlock;
 
-// myFunctionBlock __myFunctionBlock__init;
+myFunctionBlock __myFunctionBlock__init = { 0 };
 
 void myFunctionBlock_FB_INIT(myFunctionBlock* fb_instance) {
     fb_instance->a = 1;
diff --git a/tests/lit/multi/extern_C_fb_init/libfoo.so b/tests/lit/multi/extern_C_fb_init/libfoo.so
deleted file mode 100755
index e1314fb78fa1deeb1995a1b7010acd6143f734ee..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 15448
zcmeHOUu+!38K1j2a3M~7K$4~jG)t5qLX*XIoHQ*pIoq+bMotLE7KzlbtZ&c0EB7b8
z+aorDkYcqoO(R9BcmW>ZE${+@Ct47RKp_Gig2V$zMT$ft83~0T1h}n~>-WvfZ@pg5
zC=wF9%t*K2-`_Xiemi%wdpq-Z|Ik1(kq~H$#9d-e5+b7w`?tY^bvwioI^HDKO5c__
z(|5R2+6XGr%7yz_%&eB<)YD0T!p>?L(qb?*OCCe|p%y`-xNFEZyG1$7cF(7)lS;NU
z1&&3=rEFzS-8G+{)_H=alv(D;dG65h;&g-d1C{4Qx_uV|pZP9JIm9XaL4muMaGdAW
zHk5r>_qR}8QaXQ7eY*1eR#0b)=(Bt8sQBZ)<hI9e{h+-5o7bnmPOMvYDfRqX&IR>j
zT$o=f6Y}4#d1;#c7HXWQ)x=mL-3?9j+>g~nzj*=u0O{8^@gF7K4Wd<~uUE!i__*#w
zsZw@pfmaP&SGa>Cdt5(P%}o?)L9RNor>|Hk=SIA-VouqbTiooV=Z+W3Ua{~<PL!qw
z>g8-usFZt)mFz?AK(9NvcW^`;sus$@xF{CJvUaUvZx_3V27CM5PP^0QuVaF$n+T5y
z5s(howZ5jXgsXo<=Z*1>@hS9q(bruz=uhhabcyEaA)ni+^n5M3)@bJ=dL9#KA4T*S
zt8BXv(aYZf05XcXmWUpDuo!A8U@BlLU@BlLU@BlLU@BlLU@GtfEAUm@FaGOHf1YxV
zFFtdJ5YC@Y2g$~HXZr2bTQYKE+q<N0Y<!=NZR;|`v7BeyXBQgOHa<=A_(`PUoalay
z6wZmouQ2)bY_O6-KfpYNUedVGw(cnVzNIPoACvyuo?x=+igWC;bLP@c=gjOPCvn#K
z;7YK90&LL%QjH7aZR>W;;W_`K-Th=1^<R!U)7{rG>m0inv^vMTZzW;o0A)Gj)8Xvm
zn@LU_q`t%c8UNW~GU|Lr2}<=yJI5ZIb&mJXz9XM<B$sL72NGtFx69+c7Rvsg%Y}GZ
z%>4UGqd`?mAEdH{H4UpsIMYl8Oa)8@Oa)8@Oa)8@Oa)8@Oa)8@Oa)8@e!>dGUOifc
zav><lx01efxDezm&+4`|`kSpWNw4En6KfaUX%Xf3e4l^OX#AFF>*YqnC;Bg<j}ql~
z!`u>&42#5MI<dC(+SEyUVYq>GH__)5;VhzJd3s>^>bu*P9!?z<JJ;NK`_>Kebu8oQ
zF<(4Ket0*@?u`8%efCp7@||qY^7NmReao(Sj5=Tk(@X_S1xy7@1xy7@1xy7@1xy7@
z1xy7@1?E>kum8k)PpswSHKg2H6$uxVF4OXe#{FE&SXU|+`;rdNU~7Qa>r45$jT`J=
zUujfWeo!y+#2V0ceyF5|wZebVcKP5*`oBu65KA>(t*M5I8NIGl!vySj9_4kV+<vBr
zIN72Y=x1~w<atW_(PCQJ5RYE>%KXo1e|m!~Wz>-#Po?}1ZU2v!k*5y#qY<oIk9W8|
zw%&JlU*B)6+eXLg<)ChLY_+%A?OV3jrPz6-v&(Mp+N9M&J7tSrdBS=)SFO?dWvgR{
z-C=LFZtGB(j!p3nV=~vPMSR(aspa@f(s3UaG;0TX+fM6(TgB0s{uZsrct*Tm5tE>+
zoz5r?u1}xT(+YAuK9yC7-xI^}!}ZbH@UZm1USPb#|0!ac<-gE*JuBm+#d!-6=4i7x
zFOoSamI-|C;QcZ&39(9~GSDdchSc9E;@A7EG`EHO3V`}p`mYM>1N}v*Um1R%p#L8+
zN!tA(V)f@OBo>?^^k&jGTc_W?fd5YE|J`->_b=f82hy*P^cS+(YETR6<KuQ#%q`D%
zgOZ!&1^PANx_-r-C|1V2qU#5hYR&cPlOkIw9V+I6oNu=`_uxhQ1=p)qy(u?W4ysdP
zyy}&5u3s;erU(*|T>dX@o@<b+1(c8L4h;9~>3940?&2K;9FaS#RouK+_IcyLt^<2}
z_6+usmiAV-{f-7WyM{?cdkg^GJ#<fR&yai1z`%X|Bko8~?@&Jl<bJ<*V}jaOkcsXl
zh;3_#{Vf>oNRZndu3}5Wyx797O_c&~jA&3*G!L#^33B#Cxo(fu3q^lR!531>d$qi<
z{i!k`6%DG&qJL=S2`<^HxuVAa%^fNR!j^@wiM1yxBnG)jI?8g})r#*0p0IOyeaZ4Z
z1%afX>e?v;c<R9`6|&TQCE&=EoQyM8s|lM%Pl*OaI0k<J!}Do$55z+IhtP$d#vlsb
zuJjGfIhY3@)C?&956cbn5#~FkrF~1p@Ei*~=3!9Gi`*}L1;cqA^J9i|92<Dd>!6s&
z$wfAf5p50$Jf{MWc@&iA0dB}2exSU6hv#U>n5RK422+dYue3t=+6FxC3qW!H=pXgN
z`Ij}mR|mv>1}OX(zmh(2{3PkPCb$m@e{c2gF7CI;MK(T<XseMB#akK|(x@}>_&EnX
z62oV-0TlTn3}nzJV|dKtpvl+;N56=7B8JEO2a5Yq_{Y!x?;76;2TL=Wc0jKw(gA&j
z^vvV>cUj62bb}JZW4!+t$P&fxx0EaBqaji;s2kL;62oI0;|up4*rylwhYb2AVcR13
z@IHrs7^uNdNpmvv?~#GW9{R`q1olCm)`h}(1BdJQ1Yy|)c<dWHcLyn{S@Jk{03P&1
zGDY#Yub;U}{3kIy?vqmOs!#NT4C3;qWMCcg$Ngh^0lY2;!igE;Sf|}XJ@CV!Mlrxg
zDaKyZHLn96(nfyH;%6J=kKYx3UP10r{73o=@i%m&jWJQ){x-w=T?+7JG$`?L{Qm)M
CJal>h

diff --git a/tests/lit/multi/extern_C_fb_init/lit.local.cfg b/tests/lit/multi/extern_C_fb_init/lit.local.cfg
index bbac64e691..214961981b 100644
--- a/tests/lit/multi/extern_C_fb_init/lit.local.cfg
+++ b/tests/lit/multi/extern_C_fb_init/lit.local.cfg
@@ -1,27 +1,45 @@
 # Override the compile command to include the custom library
 import os.path
+import subprocess
 
 # Access the same parameters that the main configuration uses
 stdlibLocation = lit_config.params["LIB"]
 compilerLocation = lit_config.params["COMPILER"]
-rustyRootDirectory = "/home/michael/dev/rusty"
 
+# Derive rusty root directory using relative paths
 test_dir = os.path.dirname(__file__)
-lib_path = os.path.abspath(test_dir)
+source_path = os.path.abspath(test_dir)
+rustyRootDirectory = os.path.abspath(os.path.join(test_dir, "..", "..", "..", ".."))
+
+# Use tmp directory for compiled library
+tmp_lib_path = "/tmp"
+tmp_lib_file = f"{tmp_lib_path}/libfoo.so"
+
+# Compile foo.c to libfoo.so in the tmp directory
+try:
+    lit_config.note(f"Compiling foo.c into {tmp_lib_file}...")
+    gcc_cmd = f"gcc -shared -fPIC -o {tmp_lib_file} {source_path}/foo.c"
+    lit_config.note(f"Running: {gcc_cmd}")
+    result = subprocess.run(gcc_cmd, shell=True, check=True, 
+                           stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    lit_config.note(f"Successfully compiled {tmp_lib_file}")
+except subprocess.CalledProcessError as e:
+    lit_config.error(f"Failed to compile foo.c: {e.stderr.decode()}")
+    raise
 
 # Build on the existing compile command but add our custom library
 compile = f'{compilerLocation}'
 compile = f'{compile} -o /tmp/%basename_t.out'
 compile = f'{compile} -liec61131std -L{stdlibLocation}/lib -i "{stdlibLocation}/include/*.st"'
 compile = f'{compile} -i "{rustyRootDirectory}/tests/lit/util/*.pli"'
-compile = f'{compile} -L{lib_path} -lfoo -i {lib_path}/header.pli'
+compile = f'{compile} -L{tmp_lib_path} -lfoo -i {source_path}/header.pli'
 compile = f'{compile} --linker=cc'
 
 # Log the compile command
 lit_config.note(f"Compile command: {compile}")
 
 # Update the run command to include the custom library path
-run_cmd = f'LD_LIBRARY_PATH="{stdlibLocation}/lib:{lib_path}" /tmp/%basename_t.out'
+run_cmd = f'LD_LIBRARY_PATH="{stdlibLocation}/lib:{tmp_lib_path}" /tmp/%basename_t.out'
 
 # Override the substitutions
 config.substitutions = [s for s in config.substitutions if s[0] not in ['%COMPILE', '%RUN']]

From 489c4117dbe71c0a5e2ba8b6a8d2f0dd7e12fac0 Mon Sep 17 00:00:00 2001
From: Michael Haselberger <Michael.HASELBERGER@bachmann.info>
Date: Mon, 28 Apr 2025 06:25:15 +0200
Subject: [PATCH 8/9] fix: method and action IR names are now separated by __
 instead of _

---
 book/src/libraries/api_lib_guide.md           |  4 +-
 book/src/using_rusty.md                       |  2 +-
 src/codegen/tests/code_gen_tests.rs           | 40 ++++----
 src/codegen/tests/debug_tests.rs              |  6 +-
 .../complex_initializers.rs                   | 44 ++++-----
 src/codegen/tests/oop_tests.rs                |  4 +-
 src/codegen/tests/oop_tests/debug_tests.rs    |  6 +-
 src/codegen/tests/oop_tests/super_tests.rs    | 98 +++++++++----------
 ...e_gen_tests__action_called_in_program.snap |  4 +-
 ...ests__class_member_access_from_method.snap |  2 +-
 ...__code_gen_tests__class_method_in_pou.snap |  6 +-
 ...n_tests__fb_method_called_as_function.snap | 10 +-
 ...sts__code_gen_tests__fb_method_in_pou.snap |  6 +-
 ..._gen_tests__fb_method_with_var_in_out.snap |  4 +-
 ...ts__fb_method_with_var_input_defaults.snap |  4 +-
 ...code_gen_tests__method_codegen_return.snap |  6 +-
 ...__code_gen_tests__method_codegen_void.snap |  2 +-
 ...method_codegen_with_initialized_input.snap | 10 +-
 ...s__method_codegen_with_multiple_input.snap | 14 +--
 ...ts__method_with_aggregate_return_type.snap |  4 +-
 ...s__code_gen_tests__methods_var_output.snap |  6 +-
 ...fied_action_from_fb_called_in_program.snap |  4 +-
 ...fied_foreign_action_called_in_program.snap |  4 +-
 ...lified_local_action_called_in_program.snap |  4 +-
 ...var_in_out_params_can_be_out_of_order.snap |  6 +-
 src/index.rs                                  |  2 +-
 src/tests/adr/initializer_functions_adr.rs    |  8 +-
 ...__integration__cfc__ir__actions_debug.snap |  8 +-
 tests/lit/multi/extern_C_fb_init/foo.c        |  2 +-
 29 files changed, 160 insertions(+), 160 deletions(-)

diff --git a/book/src/libraries/api_lib_guide.md b/book/src/libraries/api_lib_guide.md
index 15d15acb51..c7d9c8398f 100644
--- a/book/src/libraries/api_lib_guide.md
+++ b/book/src/libraries/api_lib_guide.md
@@ -362,10 +362,10 @@ This global instance follows the naming scheme of `__<FunctionBlockName>__init`,
 myFunctionBlock __myFunctionBlock__init = { 0 };
 ```
 
-3. Optionally create an initialization function following the naming pattern `<FunctionBlockName>_FB_INIT`:
+3. Optionally create an initialization function following the naming pattern `<FunctionBlockName>__FB_INIT`:
 
 ```c
-void myFunctionBlock_FB_INIT(myFunctionBlock* fb_instance) {
+void myFunctionBlock__FB_INIT(myFunctionBlock* fb_instance) {
     // Initialize members here
     fb_instance->a = 1;
     fb_instance->b = 2;
diff --git a/book/src/using_rusty.md b/book/src/using_rusty.md
index 042040bafa..83fa8f68d1 100644
--- a/book/src/using_rusty.md
+++ b/book/src/using_rusty.md
@@ -142,7 +142,7 @@ When your code is compiled, the compiler creates a special initialization functi
 
 `<projectname>` is either taken directly from the `plc.json`'s `name` field or derived from the first input file (replacing `.`/`-` with `_`) when compiling without a `plc.json` (e.g. `plc prog.st ...` would yield `__init___prog_st`).
 
-This function is added to the global constructor list, therefore loading the binary will automatically call the `__init___<projectname>` function (and therefore your `<FunctionBlockName>_FB_INIT` function) when an instance of your function block is created, before any other methods are called. This allows you to set default values or perform required setup for your function block.
+This function is added to the global constructor list, therefore loading the binary will automatically call the `__init___<projectname>` function (and therefore your `<FunctionBlockName>__FB_INIT` function) when an instance of your function block is created, before any other methods are called. This allows you to set default values or perform required setup for your function block.
 
 > **IMPORTANT:** The global constructor initialization is currently only supported for `x86` ISAs. To make sure initialization code runs reliably regardless of target-architecture, ensure your runtime calls this function before starting main task execution.
 If you're using the executable without a runtime, you **must** ensure that `__init___<projectname>` is called before any other code runs. Failure to do so will result in uninitialized function blocks and pointers, which can lead to undefined behavior and/or crashes.
diff --git a/src/codegen/tests/code_gen_tests.rs b/src/codegen/tests/code_gen_tests.rs
index 26f29a137a..e6ca190d62 100644
--- a/src/codegen/tests/code_gen_tests.rs
+++ b/src/codegen/tests/code_gen_tests.rs
@@ -1115,11 +1115,11 @@ fn fb_method_called_locally() {
     define void @foo(%foo* %0) {
     entry:
       %bar = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
-      %call = call i32 @foo_addToBar(%foo* %0, i16 42)
+      %call = call i32 @foo__addToBar(%foo* %0, i16 42)
       ret void
     }
 
-    define i32 @foo_addToBar(%foo* %0, i16 %1) {
+    define i32 @foo__addToBar(%foo* %0, i16 %1) {
     entry:
       %bar = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %foo.addToBar = alloca i32, align 4
@@ -1133,8 +1133,8 @@ fn fb_method_called_locally() {
       store i32 %tmpVar, i32* %bar, align 4
       %load_bar1 = load i32, i32* %bar, align 4
       store i32 %load_bar1, i32* %foo.addToBar, align 4
-      %foo_addToBar_ret = load i32, i32* %foo.addToBar, align 4
-      ret i32 %foo_addToBar_ret
+      %foo__addToBar_ret = load i32, i32* %foo.addToBar, align 4
+      ret i32 %foo__addToBar_ret
     }
 
     define void @main() {
@@ -1144,7 +1144,7 @@ fn fb_method_called_locally() {
       %0 = bitcast %foo* %fb to i8*
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 bitcast (%foo* @__foo__init to i8*), i64 ptrtoint (%foo* getelementptr (%foo, %foo* null, i32 1) to i64), i1 false)
       store i32 0, i32* %x, align 4
-      %call = call i32 @foo_addToBar(%foo* %fb, i16 3)
+      %call = call i32 @foo__addToBar(%foo* %fb, i16 3)
       store i32 %call, i32* %x, align 4
       ret void
     }
@@ -1198,11 +1198,11 @@ fn fb_local_method_var_shadows_parent_var() {
     define void @foo(%foo* %0) {
     entry:
       %bar = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
-      %call = call i32 @foo_addToBar(%foo* %0, i16 42)
+      %call = call i32 @foo__addToBar(%foo* %0, i16 42)
       ret void
     }
 
-    define i32 @foo_addToBar(%foo* %0, i16 %1) {
+    define i32 @foo__addToBar(%foo* %0, i16 %1) {
     entry:
       %bar = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %foo.addToBar = alloca i32, align 4
@@ -1218,8 +1218,8 @@ fn fb_local_method_var_shadows_parent_var() {
       store i32 %tmpVar, i32* %bar1, align 4
       %load_bar2 = load i32, i32* %bar1, align 4
       store i32 %load_bar2, i32* %foo.addToBar, align 4
-      %foo_addToBar_ret = load i32, i32* %foo.addToBar, align 4
-      ret i32 %foo_addToBar_ret
+      %foo__addToBar_ret = load i32, i32* %foo.addToBar, align 4
+      ret i32 %foo__addToBar_ret
     }
 
     define void @main() {
@@ -1229,7 +1229,7 @@ fn fb_local_method_var_shadows_parent_var() {
       %0 = bitcast %foo* %fb to i8*
       call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 bitcast (%foo* @__foo__init to i8*), i64 ptrtoint (%foo* getelementptr (%foo, %foo* null, i32 1) to i64), i1 false)
       store i32 0, i32* %x, align 4
-      %call = call i32 @foo_addToBar(%foo* %fb, i16 3)
+      %call = call i32 @foo__addToBar(%foo* %fb, i16 3)
       store i32 %call, i32* %x, align 4
       ret void
     }
@@ -1280,11 +1280,11 @@ fn prog_method_called_locally() {
     define void @foo(%foo* %0) {
     entry:
       %bar = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
-      %call = call i32 @foo_addToBar(%foo* %0, i16 42)
+      %call = call i32 @foo__addToBar(%foo* %0, i16 42)
       ret void
     }
 
-    define i32 @foo_addToBar(%foo* %0, i16 %1) {
+    define i32 @foo__addToBar(%foo* %0, i16 %1) {
     entry:
       %bar = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %foo.addToBar = alloca i32, align 4
@@ -1298,15 +1298,15 @@ fn prog_method_called_locally() {
       store i32 %tmpVar, i32* %bar, align 4
       %load_bar1 = load i32, i32* %bar, align 4
       store i32 %load_bar1, i32* %foo.addToBar, align 4
-      %foo_addToBar_ret = load i32, i32* %foo.addToBar, align 4
-      ret i32 %foo_addToBar_ret
+      %foo__addToBar_ret = load i32, i32* %foo.addToBar, align 4
+      ret i32 %foo__addToBar_ret
     }
 
     define void @main() {
     entry:
       %x = alloca i32, align 4
       store i32 0, i32* %x, align 4
-      %call = call i32 @foo_addToBar(%foo* @foo_instance, i16 3)
+      %call = call i32 @foo__addToBar(%foo* @foo_instance, i16 3)
       store i32 %call, i32* %x, align 4
       ret void
     }
@@ -1354,11 +1354,11 @@ fn prog_local_method_var_shadows_parent_var() {
     define void @foo(%foo* %0) {
     entry:
       %bar = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
-      %call = call i32 @foo_addToBar(%foo* %0, i16 42)
+      %call = call i32 @foo__addToBar(%foo* %0, i16 42)
       ret void
     }
 
-    define i32 @foo_addToBar(%foo* %0, i16 %1) {
+    define i32 @foo__addToBar(%foo* %0, i16 %1) {
     entry:
       %bar = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %foo.addToBar = alloca i32, align 4
@@ -1374,15 +1374,15 @@ fn prog_local_method_var_shadows_parent_var() {
       store i32 %tmpVar, i32* %bar1, align 4
       %load_bar2 = load i32, i32* %bar1, align 4
       store i32 %load_bar2, i32* %foo.addToBar, align 4
-      %foo_addToBar_ret = load i32, i32* %foo.addToBar, align 4
-      ret i32 %foo_addToBar_ret
+      %foo__addToBar_ret = load i32, i32* %foo.addToBar, align 4
+      ret i32 %foo__addToBar_ret
     }
 
     define void @main() {
     entry:
       %x = alloca i32, align 4
       store i32 0, i32* %x, align 4
-      %call = call i32 @foo_addToBar(%foo* @foo_instance, i16 3)
+      %call = call i32 @foo__addToBar(%foo* @foo_instance, i16 3)
       store i32 %call, i32* %x, align 4
       ret void
     }
diff --git a/src/codegen/tests/debug_tests.rs b/src/codegen/tests/debug_tests.rs
index 91d86b89eb..0cd6f32a86 100644
--- a/src/codegen/tests/debug_tests.rs
+++ b/src/codegen/tests/debug_tests.rs
@@ -364,7 +364,7 @@ fn dbg_declare_has_valid_metadata_references_for_methods() {
       ret void, !dbg !13
     }
 
-    define void @fb_foo(%fb* %0) !dbg !14 {
+    define void @fb__foo(%fb* %0) !dbg !14 {
     entry:
       call void @llvm.dbg.declare(metadata %fb* %0, metadata !15, metadata !DIExpression()), !dbg !16
       ret void, !dbg !16
@@ -457,7 +457,7 @@ fn action_with_var_temp() {
       call void @llvm.dbg.declare(metadata i32* %main, metadata !12, metadata !DIExpression()), !dbg !14
       store i32 0, i32* %main, align 4
       call void @PLC_PRG(%PLC_PRG* @PLC_PRG_instance), !dbg !15
-      call void @PLC_PRG_act(%PLC_PRG* @PLC_PRG_instance), !dbg !16
+      call void @PLC_PRG__act(%PLC_PRG* @PLC_PRG_instance), !dbg !16
       %main_ret = load i32, i32* %main, align 4, !dbg !17
       ret i32 %main_ret, !dbg !17
     }
@@ -472,7 +472,7 @@ fn action_with_var_temp() {
       ret void, !dbg !25
     }
 
-    define void @PLC_PRG_act(%PLC_PRG* %0) !dbg !26 {
+    define void @PLC_PRG__act(%PLC_PRG* %0) !dbg !26 {
     entry:
       call void @llvm.dbg.declare(metadata %PLC_PRG* %0, metadata !27, metadata !DIExpression()), !dbg !28
       %x = alloca i32, align 4
diff --git a/src/codegen/tests/initialization_test/complex_initializers.rs b/src/codegen/tests/initialization_test/complex_initializers.rs
index 857e3c94bf..7ac7588494 100644
--- a/src/codegen/tests/initialization_test/complex_initializers.rs
+++ b/src/codegen/tests/initialization_test/complex_initializers.rs
@@ -388,7 +388,7 @@ fn nested_initializer_pous() {
     entry:
       %str_ref = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %b = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
-      call void @bar_print(%bar* %b)
+      call void @bar__print(%bar* %b)
       call void @bar(%bar* %b)
       ret void
     }
@@ -396,7 +396,7 @@ fn nested_initializer_pous() {
     define void @bar(%bar* %0) {
     entry:
       %b = getelementptr inbounds %bar, %bar* %0, i32 0, i32 0
-      call void @baz_print(%baz* %b)
+      call void @baz__print(%baz* %b)
       ret void
     }
 
@@ -418,24 +418,24 @@ fn nested_initializer_pous() {
       %other_ref_to_global = getelementptr inbounds %sideProg, %sideProg* %0, i32 0, i32 0
       %f = getelementptr inbounds %sideProg, %sideProg* %0, i32 0, i32 1
       call void @foo(%foo* %f)
-      call void @foo_print(%foo* %f)
+      call void @foo__print(%foo* %f)
       ret void
     }
 
-    define void @bar_print(%bar* %0) {
+    define void @bar__print(%bar* %0) {
     entry:
       %b = getelementptr inbounds %bar, %bar* %0, i32 0, i32 0
       ret void
     }
 
-    define void @foo_print(%foo* %0) {
+    define void @foo__print(%foo* %0) {
     entry:
       %str_ref = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %b = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
       ret void
     }
 
-    define void @baz_print(%baz* %0) {
+    define void @baz__print(%baz* %0) {
     entry:
       %str_ref = getelementptr inbounds %baz, %baz* %0, i32 0, i32 0
       ret void
@@ -834,7 +834,7 @@ fn stateful_pous_methods_and_structs_get_init_functions() {
       ret void
     }
 
-    define void @foo_m(%foo* %0) {
+    define void @foo__m(%foo* %0) {
     entry:
       ret void
     }
@@ -844,12 +844,12 @@ fn stateful_pous_methods_and_structs_get_init_functions() {
       ret void
     }
 
-    define void @cl_m(%cl* %0) {
+    define void @cl__m(%cl* %0) {
     entry:
       ret void
     }
 
-    define void @foo_act(%foo* %0) {
+    define void @foo__act(%foo* %0) {
     entry:
       ret void
     }
@@ -1657,7 +1657,7 @@ fn initializing_method_variables_with_refs() {
       ret void
     }
 
-    define void @foo_bar(%foo* %0) {
+    define void @foo__bar(%foo* %0) {
     entry:
       %x = alloca i32, align 4
       %px = alloca i32*, align 8
@@ -1724,7 +1724,7 @@ fn initializing_method_variables_with_refs_referencing_parent_pou_variable() {
       ret void
     }
 
-    define void @foo_bar(%foo* %0) {
+    define void @foo__bar(%foo* %0) {
     entry:
       %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %px = alloca i32*, align 8
@@ -1790,7 +1790,7 @@ fn initializing_method_variables_with_refs_referencing_global_variable() {
       ret void
     }
 
-    define void @foo_bar(%foo* %0) {
+    define void @foo__bar(%foo* %0) {
     entry:
       %px = alloca i32*, align 8
       store i32* @x, i32** %px, align 8
@@ -1856,7 +1856,7 @@ fn initializing_method_variables_with_refs_shadowing() {
       ret void
     }
 
-    define void @foo_bar(%foo* %0) {
+    define void @foo__bar(%foo* %0) {
     entry:
       %x = alloca i32, align 4
       %px = alloca i32*, align 8
@@ -1919,7 +1919,7 @@ fn initializing_method_variables_with_alias() {
       ret void
     }
 
-    define void @foo_bar(%foo* %0) {
+    define void @foo__bar(%foo* %0) {
     entry:
       %x = alloca i32, align 4
       %px = alloca i32*, align 8
@@ -1982,7 +1982,7 @@ fn initializing_method_variables_with_reference_to() {
       ret void
     }
 
-    define void @foo_bar(%foo* %0) {
+    define void @foo__bar(%foo* %0) {
     entry:
       %x = alloca i32, align 4
       %px = alloca i32*, align 8
@@ -2061,7 +2061,7 @@ fn methods_call_init_functions_for_their_members() {
       ret void
     }
 
-    define void @bar_baz(%bar* %0) {
+    define void @bar__baz(%bar* %0) {
     entry:
       %fb = alloca %foo, align 8
       %1 = bitcast %foo* %fb to i8*
@@ -2162,7 +2162,7 @@ fn user_fb_init_is_added_and_called_if_it_exists() {
       ret void
     }
 
-    define void @foo_FB_INIT(%foo* %0) {
+    define void @foo__FB_INIT(%foo* %0) {
     entry:
       %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %y = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
@@ -2210,7 +2210,7 @@ fn user_fb_init_is_added_and_called_if_it_exists() {
       %self = alloca %foo*, align 8
       store %foo* %0, %foo** %self, align 8
       %deref = load %foo*, %foo** %self, align 8
-      call void @foo_FB_INIT(%foo* %deref)
+      call void @foo__FB_INIT(%foo* %deref)
       ret void
     }
 
@@ -2282,7 +2282,7 @@ fn user_fb_init_in_global_struct() {
       ret void
     }
 
-    define void @foo_FB_INIT(%foo* %0) {
+    define void @foo__FB_INIT(%foo* %0) {
     entry:
       %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %y = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
@@ -2351,7 +2351,7 @@ fn user_fb_init_in_global_struct() {
       %self = alloca %foo*, align 8
       store %foo* %0, %foo** %self, align 8
       %deref = load %foo*, %foo** %self, align 8
-      call void @foo_FB_INIT(%foo* %deref)
+      call void @foo__FB_INIT(%foo* %deref)
       ret void
     }
 
@@ -2406,7 +2406,7 @@ fn user_init_called_when_declared_as_external() {
 
     declare void @foo(%foo*)
 
-    declare void @foo_FB_INIT(%foo*)
+    declare void @foo__FB_INIT(%foo*)
 
     define void @prog(%prog* %0) {
     entry:
@@ -2437,7 +2437,7 @@ fn user_init_called_when_declared_as_external() {
       %self = alloca %foo*, align 8
       store %foo* %0, %foo** %self, align 8
       %deref = load %foo*, %foo** %self, align 8
-      call void @foo_FB_INIT(%foo* %deref)
+      call void @foo__FB_INIT(%foo* %deref)
       ret void
     }
 
diff --git a/src/codegen/tests/oop_tests.rs b/src/codegen/tests/oop_tests.rs
index 29c8eae4a8..c0c602f417 100644
--- a/src/codegen/tests/oop_tests.rs
+++ b/src/codegen/tests/oop_tests.rs
@@ -250,7 +250,7 @@ fn write_to_parent_variable_in_instance() {
       ret void
     }
 
-    define void @foo_baz(%foo* %0) {
+    define void @foo__baz(%foo* %0) {
     entry:
       %s = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %1 = bitcast [81 x i8]* %s to i8*
@@ -278,7 +278,7 @@ fn write_to_parent_variable_in_instance() {
       call void @__init_bar(%bar* %fb)
       call void @__user_init_bar(%bar* %fb)
       %__foo = getelementptr inbounds %bar, %bar* %fb, i32 0, i32 0
-      call void @foo_baz(%foo* %__foo)
+      call void @foo__baz(%foo* %__foo)
       call void @bar(%bar* %fb)
       ret void
     }
diff --git a/src/codegen/tests/oop_tests/debug_tests.rs b/src/codegen/tests/oop_tests/debug_tests.rs
index ea080bc34a..3157f54d35 100644
--- a/src/codegen/tests/oop_tests/debug_tests.rs
+++ b/src/codegen/tests/oop_tests/debug_tests.rs
@@ -346,7 +346,7 @@ fn write_to_parent_variable_in_instance() {
       ret void, !dbg !24
     }
 
-    define void @foo_baz(%foo* %0) !dbg !25 {
+    define void @foo__baz(%foo* %0) !dbg !25 {
     entry:
       call void @llvm.dbg.declare(metadata %foo* %0, metadata !26, metadata !DIExpression()), !dbg !27
       %s = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
@@ -378,7 +378,7 @@ fn write_to_parent_variable_in_instance() {
       call void @__init_bar(%bar* %fb), !dbg !42
       call void @__user_init_bar(%bar* %fb), !dbg !42
       %__foo = getelementptr inbounds %bar, %bar* %fb, i32 0, i32 0, !dbg !42
-      call void @foo_baz(%foo* %__foo), !dbg !43
+      call void @foo__baz(%foo* %__foo), !dbg !43
       call void @bar(%bar* %fb), !dbg !44
       ret void, !dbg !45
     }
@@ -967,7 +967,7 @@ fn function_block_method_debug_info() {
       ret void, !dbg !18
     }
 
-    define void @foo_baz(%foo* %0) !dbg !19 {
+    define void @foo__baz(%foo* %0) !dbg !19 {
     entry:
       call void @llvm.dbg.declare(metadata %foo* %0, metadata !20, metadata !DIExpression()), !dbg !21
       ret void, !dbg !21
diff --git a/src/codegen/tests/oop_tests/super_tests.rs b/src/codegen/tests/oop_tests/super_tests.rs
index 197afdfda9..9f1695a320 100644
--- a/src/codegen/tests/oop_tests/super_tests.rs
+++ b/src/codegen/tests/oop_tests/super_tests.rs
@@ -210,7 +210,7 @@ fn super_in_method_calls() {
       ret void
     }
 
-    define i16 @parent_process(%parent* %0) {
+    define i16 @parent__process(%parent* %0) {
     entry:
       %value = getelementptr inbounds %parent, %parent* %0, i32 0, i32 0
       %parent.process = alloca i16, align 2
@@ -220,8 +220,8 @@ fn super_in_method_calls() {
       %tmpVar = mul i32 %1, 2
       %2 = trunc i32 %tmpVar to i16
       store i16 %2, i16* %parent.process, align 2
-      %parent_process_ret = load i16, i16* %parent.process, align 2
-      ret i16 %parent_process_ret
+      %parent__process_ret = load i16, i16* %parent.process, align 2
+      ret i16 %parent__process_ret
     }
 
     define void @child(%child* %0) {
@@ -230,7 +230,7 @@ fn super_in_method_calls() {
       ret void
     }
 
-    define i16 @child_process(%child* %0) {
+    define i16 @child__process(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %child.process = alloca i16, align 2
@@ -241,19 +241,19 @@ fn super_in_method_calls() {
       %tmpVar = add i32 %1, 5
       %2 = trunc i32 %tmpVar to i16
       store i16 %2, i16* %child.process, align 2
-      %child_process_ret = load i16, i16* %child.process, align 2
-      ret i16 %child_process_ret
+      %child__process_ret = load i16, i16* %child.process, align 2
+      ret i16 %child__process_ret
     }
 
-    define i16 @child_test(%child* %0) {
+    define i16 @child__test(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %child.test = alloca i16, align 2
       store i16 0, i16* %child.test, align 2
-      %call = call i16 @parent_process(%parent* %__parent)
+      %call = call i16 @parent__process(%parent* %__parent)
       store i16 %call, i16* %child.test, align 2
-      %child_test_ret = load i16, i16* %child.test, align 2
-      ret i16 %child_test_ret
+      %child__test_ret = load i16, i16* %child.test, align 2
+      ret i16 %child__test_ret
     }
 
     define void @__init_parent(%parent* %0) {
@@ -540,15 +540,15 @@ fn super_in_multi_level_inheritance() {
       ret void
     }
 
-    define i16 @grandparent_gp_method(%grandparent* %0) {
+    define i16 @grandparent__gp_method(%grandparent* %0) {
     entry:
       %g_val = getelementptr inbounds %grandparent, %grandparent* %0, i32 0, i32 0
       %grandparent.gp_method = alloca i16, align 2
       store i16 0, i16* %grandparent.gp_method, align 2
       %load_g_val = load i16, i16* %g_val, align 2
       store i16 %load_g_val, i16* %grandparent.gp_method, align 2
-      %grandparent_gp_method_ret = load i16, i16* %grandparent.gp_method, align 2
-      ret i16 %grandparent_gp_method_ret
+      %grandparent__gp_method_ret = load i16, i16* %grandparent.gp_method, align 2
+      ret i16 %grandparent__gp_method_ret
     }
 
     define void @parent(%parent* %0) {
@@ -558,7 +558,7 @@ fn super_in_multi_level_inheritance() {
       ret void
     }
 
-    define i16 @parent_p_method(%parent* %0) {
+    define i16 @parent__p_method(%parent* %0) {
     entry:
       %__grandparent = getelementptr inbounds %parent, %parent* %0, i32 0, i32 0
       %p_val = getelementptr inbounds %parent, %parent* %0, i32 0, i32 1
@@ -566,13 +566,13 @@ fn super_in_multi_level_inheritance() {
       store i16 0, i16* %parent.p_method, align 2
       %load_p_val = load i16, i16* %p_val, align 2
       %1 = sext i16 %load_p_val to i32
-      %call = call i16 @grandparent_gp_method(%grandparent* %__grandparent)
+      %call = call i16 @grandparent__gp_method(%grandparent* %__grandparent)
       %2 = sext i16 %call to i32
       %tmpVar = add i32 %1, %2
       %3 = trunc i32 %tmpVar to i16
       store i16 %3, i16* %parent.p_method, align 2
-      %parent_p_method_ret = load i16, i16* %parent.p_method, align 2
-      ret i16 %parent_p_method_ret
+      %parent__p_method_ret = load i16, i16* %parent.p_method, align 2
+      ret i16 %parent__p_method_ret
     }
 
     define void @child(%child* %0) {
@@ -582,16 +582,16 @@ fn super_in_multi_level_inheritance() {
       ret void
     }
 
-    define i16 @child_test(%child* %0) {
+    define i16 @child__test(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %c_val = getelementptr inbounds %child, %child* %0, i32 0, i32 1
       %child.test = alloca i16, align 2
       store i16 0, i16* %child.test, align 2
-      %call = call i16 @parent_p_method(%parent* %__parent)
+      %call = call i16 @parent__p_method(%parent* %__parent)
       store i16 %call, i16* %child.test, align 2
-      %child_test_ret = load i16, i16* %child.test, align 2
-      ret i16 %child_test_ret
+      %child__test_ret = load i16, i16* %child.test, align 2
+      ret i16 %child__test_ret
     }
 
     define void @__init_parent(%parent* %0) {
@@ -803,7 +803,7 @@ fn super_in_conditionals() {
       ret void
     }
 
-    define void @child_test(%child* %0) {
+    define void @child__test(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %value = getelementptr inbounds %parent, %parent* %__parent, i32 0, i32 1
@@ -1035,7 +1035,7 @@ fn super_as_function_parameter() {
       ret void
     }
 
-    define void @child_test(%child* %0) {
+    define void @child__test(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %call = call i16 @process_ref(%parent* %__parent)
@@ -1159,7 +1159,7 @@ fn super_with_deeply_nested_expressions() {
       ret void
     }
 
-    define i16 @parent_calc(%parent* %0) {
+    define i16 @parent__calc(%parent* %0) {
     entry:
       %a = getelementptr inbounds %parent, %parent* %0, i32 0, i32 0
       %b = getelementptr inbounds %parent, %parent* %0, i32 0, i32 1
@@ -1176,8 +1176,8 @@ fn super_with_deeply_nested_expressions() {
       %tmpVar1 = add i32 %1, %tmpVar
       %4 = trunc i32 %tmpVar1 to i16
       store i16 %4, i16* %parent.calc, align 2
-      %parent_calc_ret = load i16, i16* %parent.calc, align 2
-      ret i16 %parent_calc_ret
+      %parent__calc_ret = load i16, i16* %parent.calc, align 2
+      ret i16 %parent__calc_ret
     }
 
     define void @child(%child* %0) {
@@ -1186,7 +1186,7 @@ fn super_with_deeply_nested_expressions() {
       ret void
     }
 
-    define i16 @child_test(%child* %0) {
+    define i16 @child__test(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %child.test = alloca i16, align 2
@@ -1202,7 +1202,7 @@ fn super_with_deeply_nested_expressions() {
       %load_c = load i16, i16* %c, align 2
       %3 = sext i16 %load_c to i32
       %tmpVar1 = mul i32 %tmpVar, %3
-      %call = call i16 @parent_calc(%parent* %__parent)
+      %call = call i16 @parent__calc(%parent* %__parent)
       %4 = sext i16 %call to i32
       %tmpVar2 = add i32 %tmpVar1, %4
       %a3 = getelementptr inbounds %parent, %parent* %__parent, i32 0, i32 0
@@ -1212,8 +1212,8 @@ fn super_with_deeply_nested_expressions() {
       %tmpVar6 = sdiv i32 %tmpVar2, %tmpVar5
       %6 = trunc i32 %tmpVar6 to i16
       store i16 %6, i16* %child.test, align 2
-      %child_test_ret = load i16, i16* %child.test, align 2
-      ret i16 %child_test_ret
+      %child__test_ret = load i16, i16* %child.test, align 2
+      ret i16 %child__test_ret
     }
 
     define void @__init_parent(%parent* %0) {
@@ -1318,7 +1318,7 @@ fn super_in_loop_constructs() {
       ret void
     }
 
-    define void @parent_increment(%parent* %0) {
+    define void @parent__increment(%parent* %0) {
     entry:
       %counter = getelementptr inbounds %parent, %parent* %0, i32 0, i32 0
       %arr = getelementptr inbounds %parent, %parent* %0, i32 0, i32 1
@@ -1336,7 +1336,7 @@ fn super_in_loop_constructs() {
       ret void
     }
 
-    define void @child_process(%child* %0) {
+    define void @child__process(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %i = alloca i16, align 2
@@ -1372,7 +1372,7 @@ fn super_in_loop_constructs() {
       %tmpVar4 = add i32 %5, %7
       %8 = trunc i32 %tmpVar4 to i16
       store i16 %8, i16* %sum, align 2
-      call void @parent_increment(%parent* %__parent)
+      call void @parent__increment(%parent* %__parent)
       br label %increment
 
     increment:                                        ; preds = %loop
@@ -1409,7 +1409,7 @@ fn super_in_loop_constructs() {
       br label %continue6
 
     continue6:                                        ; preds = %buffer_block, %while_body
-      call void @parent_increment(%parent* %__parent)
+      call void @parent__increment(%parent* %__parent)
       br label %condition_check
 
     condition_check9:                                 ; preds = %continue16, %continue5
@@ -1528,13 +1528,13 @@ fn super_with_method_overrides_in_three_levels() {
       ret void
     }
 
-    define i16 @grandparent_calculate(%grandparent* %0) {
+    define i16 @grandparent__calculate(%grandparent* %0) {
     entry:
       %grandparent.calculate = alloca i16, align 2
       store i16 0, i16* %grandparent.calculate, align 2
       store i16 100, i16* %grandparent.calculate, align 2
-      %grandparent_calculate_ret = load i16, i16* %grandparent.calculate, align 2
-      ret i16 %grandparent_calculate_ret
+      %grandparent__calculate_ret = load i16, i16* %grandparent.calculate, align 2
+      ret i16 %grandparent__calculate_ret
     }
 
     define void @parent(%parent* %0) {
@@ -1543,18 +1543,18 @@ fn super_with_method_overrides_in_three_levels() {
       ret void
     }
 
-    define i16 @parent_calculate(%parent* %0) {
+    define i16 @parent__calculate(%parent* %0) {
     entry:
       %__grandparent = getelementptr inbounds %parent, %parent* %0, i32 0, i32 0
       %parent.calculate = alloca i16, align 2
       store i16 0, i16* %parent.calculate, align 2
-      %call = call i16 @grandparent_calculate(%grandparent* %__grandparent)
+      %call = call i16 @grandparent__calculate(%grandparent* %__grandparent)
       %1 = sext i16 %call to i32
       %tmpVar = add i32 %1, 50
       %2 = trunc i32 %tmpVar to i16
       store i16 %2, i16* %parent.calculate, align 2
-      %parent_calculate_ret = load i16, i16* %parent.calculate, align 2
-      ret i16 %parent_calculate_ret
+      %parent__calculate_ret = load i16, i16* %parent.calculate, align 2
+      ret i16 %parent__calculate_ret
     }
 
     define void @child(%child* %0) {
@@ -1563,18 +1563,18 @@ fn super_with_method_overrides_in_three_levels() {
       ret void
     }
 
-    define i16 @child_calculate(%child* %0) {
+    define i16 @child__calculate(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %child.calculate = alloca i16, align 2
       store i16 0, i16* %child.calculate, align 2
-      %call = call i16 @parent_calculate(%parent* %__parent)
+      %call = call i16 @parent__calculate(%parent* %__parent)
       %1 = sext i16 %call to i32
       %tmpVar = add i32 %1, 25
       %2 = trunc i32 %tmpVar to i16
       store i16 %2, i16* %child.calculate, align 2
-      %child_calculate_ret = load i16, i16* %child.calculate, align 2
-      ret i16 %child_calculate_ret
+      %child__calculate_ret = load i16, i16* %child.calculate, align 2
+      ret i16 %child__calculate_ret
     }
 
     define void @__init_parent(%parent* %0) {
@@ -1745,7 +1745,7 @@ fn super_with_structured_types() {
       ret void
     }
 
-    define void @child_test(%child* %0) {
+    define void @child__test(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %local_data = alloca %Complex_Type, align 8
@@ -1893,7 +1893,7 @@ fn super_in_action_blocks() {
       ret void
     }
 
-    define void @parent_increment(%parent* %0) {
+    define void @parent__increment(%parent* %0) {
     entry:
       %value = getelementptr inbounds %parent, %parent* %0, i32 0, i32 0
       %load_value = load i16, i16* %value, align 2
@@ -1910,7 +1910,7 @@ fn super_in_action_blocks() {
       ret void
     }
 
-    define void @child_increase(%child* %0) {
+    define void @child__increase(%child* %0) {
     entry:
       %__parent = getelementptr inbounds %child, %child* %0, i32 0, i32 0
       %value = getelementptr inbounds %parent, %parent* %__parent, i32 0, i32 0
@@ -1920,7 +1920,7 @@ fn super_in_action_blocks() {
       %tmpVar = add i32 %1, 5
       %2 = trunc i32 %tmpVar to i16
       store i16 %2, i16* %value, align 2
-      call void @parent_increment(%parent* %__parent)
+      call void @parent__increment(%parent* %__parent)
       ret void
     }
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__action_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__action_called_in_program.snap
index c5d565cfed..6988447b8d 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__action_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__action_called_in_program.snap
@@ -13,11 +13,11 @@ source_filename = "<internal>"
 define void @prg(%prg* %0) {
 entry:
   %x = getelementptr inbounds %prg, %prg* %0, i32 0, i32 0
-  call void @prg_foo(%prg* %0)
+  call void @prg__foo(%prg* %0)
   ret void
 }
 
-define void @prg_foo(%prg* %0) {
+define void @prg__foo(%prg* %0) {
 entry:
   %x = getelementptr inbounds %prg, %prg* %0, i32 0, i32 0
   store i32 2, i32* %x, align 4
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_member_access_from_method.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_member_access_from_method.snap
index dec0e75534..a8077e6321 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_member_access_from_method.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_member_access_from_method.snap
@@ -17,7 +17,7 @@ entry:
   ret void
 }
 
-define void @MyClass_testMethod(%MyClass* %0, i16 %1) {
+define void @MyClass__testMethod(%MyClass* %0, i16 %1) {
 entry:
   %x = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 0
   %y = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 1
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_method_in_pou.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_method_in_pou.snap
index 50357bb56b..fea5756587 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_method_in_pou.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__class_method_in_pou.snap
@@ -19,7 +19,7 @@ entry:
   ret void
 }
 
-define void @MyClass_testMethod(%MyClass* %0, i16 %1) {
+define void @MyClass__testMethod(%MyClass* %0, i16 %1) {
 entry:
   %x = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 0
   %y = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 1
@@ -47,8 +47,8 @@ entry:
   %load_x = load i16, i16* %x1, align 2
   store i16 %load_x, i16* %x, align 2
   %load_x2 = load i16, i16* %x, align 2
-  call void @MyClass_testMethod(%MyClass* %cl, i16 %load_x2)
+  call void @MyClass__testMethod(%MyClass* %cl, i16 %load_x2)
   %load_x3 = load i16, i16* %x, align 2
-  call void @MyClass_testMethod(%MyClass* %cl, i16 %load_x3)
+  call void @MyClass__testMethod(%MyClass* %cl, i16 %load_x3)
   ret void
 }
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_called_as_function.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_called_as_function.snap
index 2630bd0c34..7e7fb47588 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_called_as_function.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_called_as_function.snap
@@ -14,12 +14,12 @@ define void @MyClass(%MyClass* %0) {
 entry:
   %x = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 0
   %y = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 1
-  %call = call i16 @MyClass_testMethod(%MyClass* %0, i16 1)
-  %call1 = call i16 @MyClass_testMethod(%MyClass* %0, i16 3)
+  %call = call i16 @MyClass__testMethod(%MyClass* %0, i16 1)
+  %call1 = call i16 @MyClass__testMethod(%MyClass* %0, i16 3)
   ret void
 }
 
-define i16 @MyClass_testMethod(%MyClass* %0, i16 %1) {
+define i16 @MyClass__testMethod(%MyClass* %0, i16 %1) {
 entry:
   %x = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 0
   %y = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 1
@@ -46,6 +46,6 @@ entry:
   %tmpVar2 = add i32 %6, 1
   %7 = trunc i32 %tmpVar2 to i16
   store i16 %7, i16* %MyClass.testMethod, align 2
-  %MyClass_testMethod_ret = load i16, i16* %MyClass.testMethod, align 2
-  ret i16 %MyClass_testMethod_ret
+  %MyClass__testMethod_ret = load i16, i16* %MyClass.testMethod, align 2
+  ret i16 %MyClass__testMethod_ret
 }
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_in_pou.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_in_pou.snap
index 50357bb56b..fea5756587 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_in_pou.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_in_pou.snap
@@ -19,7 +19,7 @@ entry:
   ret void
 }
 
-define void @MyClass_testMethod(%MyClass* %0, i16 %1) {
+define void @MyClass__testMethod(%MyClass* %0, i16 %1) {
 entry:
   %x = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 0
   %y = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 1
@@ -47,8 +47,8 @@ entry:
   %load_x = load i16, i16* %x1, align 2
   store i16 %load_x, i16* %x, align 2
   %load_x2 = load i16, i16* %x, align 2
-  call void @MyClass_testMethod(%MyClass* %cl, i16 %load_x2)
+  call void @MyClass__testMethod(%MyClass* %cl, i16 %load_x2)
   %load_x3 = load i16, i16* %x, align 2
-  call void @MyClass_testMethod(%MyClass* %cl, i16 %load_x3)
+  call void @MyClass__testMethod(%MyClass* %cl, i16 %load_x3)
   ret void
 }
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_in_out.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_in_out.snap
index 3b49aa33b9..d41b415537 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_in_out.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_in_out.snap
@@ -19,7 +19,7 @@ entry:
   ret void
 }
 
-define void @MyClass_testMethod(%MyClass* %0, i16* %1) {
+define void @MyClass__testMethod(%MyClass* %0, i16* %1) {
 entry:
   %x = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 0
   %y = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 1
@@ -35,6 +35,6 @@ define void @prg(%prg* %0) {
 entry:
   %cl = getelementptr inbounds %prg, %prg* %0, i32 0, i32 0
   %x = getelementptr inbounds %prg, %prg* %0, i32 0, i32 1
-  call void @MyClass_testMethod(%MyClass* %cl, i16* %x)
+  call void @MyClass__testMethod(%MyClass* %cl, i16* %x)
   ret void
 }
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_input_defaults.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_input_defaults.snap
index c4fa686240..ad0d53b36e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_input_defaults.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__fb_method_with_var_input_defaults.snap
@@ -19,7 +19,7 @@ entry:
   ret void
 }
 
-define void @MyClass_testMethod(%MyClass* %0, i16 %1) {
+define void @MyClass__testMethod(%MyClass* %0, i16 %1) {
 entry:
   %x = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 0
   %y = getelementptr inbounds %MyClass, %MyClass* %0, i32 0, i32 1
@@ -33,6 +33,6 @@ entry:
 define void @prg(%prg* %0) {
 entry:
   %cl = getelementptr inbounds %prg, %prg* %0, i32 0, i32 0
-  call void @MyClass_testMethod(%MyClass* %cl, i16 3)
+  call void @MyClass__testMethod(%MyClass* %cl, i16 3)
   ret void
 }
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_return.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_return.snap
index a343c626bb..f7e2f2e162 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_return.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_return.snap
@@ -15,13 +15,13 @@ entry:
   ret void
 }
 
-define i16 @MyClass_testMethod(%MyClass* %0, i16 %1) {
+define i16 @MyClass__testMethod(%MyClass* %0, i16 %1) {
 entry:
   %MyClass.testMethod = alloca i16, align 2
   %myMethodArg = alloca i16, align 2
   store i16 %1, i16* %myMethodArg, align 2
   store i16 0, i16* %MyClass.testMethod, align 2
   store i16 1, i16* %MyClass.testMethod, align 2
-  %MyClass_testMethod_ret = load i16, i16* %MyClass.testMethod, align 2
-  ret i16 %MyClass_testMethod_ret
+  %MyClass__testMethod_ret = load i16, i16* %MyClass.testMethod, align 2
+  ret i16 %MyClass__testMethod_ret
 }
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_void.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_void.snap
index d941e6b626..9159ec326e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_void.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_void.snap
@@ -15,7 +15,7 @@ entry:
   ret void
 }
 
-define void @MyClass_testMethod(%MyClass* %0, i16 %1) {
+define void @MyClass__testMethod(%MyClass* %0, i16 %1) {
 entry:
   %myMethodArg = alloca i16, align 2
   store i16 %1, i16* %myMethodArg, align 2
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_initialized_input.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_initialized_input.snap
index 84bec9d108..b13882ad66 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_initialized_input.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_initialized_input.snap
@@ -12,19 +12,19 @@ source_filename = "<internal>"
 
 define void @fb(%fb* %0) {
 entry:
-  %call = call i32 @fb_meth(%fb* %0, i32 5)
-  %call1 = call i32 @fb_meth(%fb* %0, i32 4)
+  %call = call i32 @fb__meth(%fb* %0, i32 5)
+  %call1 = call i32 @fb__meth(%fb* %0, i32 4)
   ret void
 }
 
-define i32 @fb_meth(%fb* %0, i32 %1) {
+define i32 @fb__meth(%fb* %0, i32 %1) {
 entry:
   %fb.meth = alloca i32, align 4
   %a = alloca i32, align 4
   store i32 %1, i32* %a, align 4
   store i32 0, i32* %fb.meth, align 4
-  %fb_meth_ret = load i32, i32* %fb.meth, align 4
-  ret i32 %fb_meth_ret
+  %fb__meth_ret = load i32, i32* %fb.meth, align 4
+  ret i32 %fb__meth_ret
 }
 
 define i32 @foo() {
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_multiple_input.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_multiple_input.snap
index c1b33f8462..e4ff4020a2 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_multiple_input.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_codegen_with_multiple_input.snap
@@ -12,14 +12,14 @@ source_filename = "<internal>"
 
 define void @fb(%fb* %0) {
 entry:
-  %call = call i32 @fb_meth(%fb* %0, i32 1, i32 2, i32 3)
-  %call1 = call i32 @fb_meth(%fb* %0, i32 5, i32 7, i32 10)
-  %call2 = call i32 @fb_meth(%fb* %0, i32 3, i32 4, i32 10)
-  %call3 = call i32 @fb_meth(%fb* %0, i32 6, i32 4, i32 10)
+  %call = call i32 @fb__meth(%fb* %0, i32 1, i32 2, i32 3)
+  %call1 = call i32 @fb__meth(%fb* %0, i32 5, i32 7, i32 10)
+  %call2 = call i32 @fb__meth(%fb* %0, i32 3, i32 4, i32 10)
+  %call3 = call i32 @fb__meth(%fb* %0, i32 6, i32 4, i32 10)
   ret void
 }
 
-define i32 @fb_meth(%fb* %0, i32 %1, i32 %2, i32 %3) {
+define i32 @fb__meth(%fb* %0, i32 %1, i32 %2, i32 %3) {
 entry:
   %fb.meth = alloca i32, align 4
   %a = alloca i32, align 4
@@ -29,6 +29,6 @@ entry:
   %c = alloca i32, align 4
   store i32 %3, i32* %c, align 4
   store i32 0, i32* %fb.meth, align 4
-  %fb_meth_ret = load i32, i32* %fb.meth, align 4
-  ret i32 %fb_meth_ret
+  %fb__meth_ret = load i32, i32* %fb.meth, align 4
+  ret i32 %fb__meth_ret
 }
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_with_aggregate_return_type.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_with_aggregate_return_type.snap
index cb1b14c815..f608376cb2 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_with_aggregate_return_type.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__method_with_aggregate_return_type.snap
@@ -20,14 +20,14 @@ entry:
   %2 = bitcast [81 x i8]* %__method_with_aggregagte_return0 to i8*
   call void @llvm.memset.p0i8.i64(i8* align 1 %2, i8 0, i64 ptrtoint ([81 x i8]* getelementptr ([81 x i8], [81 x i8]* null, i32 1) to i64), i1 false)
   %3 = bitcast [81 x i8]* %__method_with_aggregagte_return0 to i8*
-  call void @fb_with_method_method_with_aggregagte_return(%fb_with_method* %0, i8* %3, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @utf08_literal_0, i32 0, i32 0))
+  call void @fb_with_method__method_with_aggregagte_return(%fb_with_method* %0, i8* %3, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @utf08_literal_0, i32 0, i32 0))
   %4 = bitcast [81 x i8]* %ret to i8*
   %5 = bitcast [81 x i8]* %__method_with_aggregagte_return0 to i8*
   call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 %4, i8* align 1 %5, i32 80, i1 false)
   ret void
 }
 
-define void @fb_with_method_method_with_aggregagte_return(%fb_with_method* %0, i8* %1, i8* %2) {
+define void @fb_with_method__method_with_aggregagte_return(%fb_with_method* %0, i8* %1, i8* %2) {
 entry:
   %ret = alloca [81 x i8], align 1
   %method_with_aggregagte_return = alloca i8*, align 8
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__methods_var_output.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__methods_var_output.snap
index 3e54d86274..f4cfb1c632 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__methods_var_output.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__methods_var_output.snap
@@ -16,7 +16,7 @@ entry:
   ret void
 }
 
-define void @foo_baz(%foo* %0, [81 x i8]* %1) {
+define void @foo__baz(%foo* %0, [81 x i8]* %1) {
 entry:
   %out = alloca [81 x i8]*, align 8
   store [81 x i8]* %1, [81 x i8]** %out, align 8
@@ -35,9 +35,9 @@ entry:
   %1 = bitcast %foo* %fb to i8*
   call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %1, i8* align 1 bitcast (%foo* @__foo__init to i8*), i64 ptrtoint (%foo* getelementptr (%foo, %foo* null, i32 1) to i64), i1 false)
   %2 = bitcast [81 x i8]* %s to i8*
-  call void @foo_baz(%foo* %fb, i8* %2)
+  call void @foo__baz(%foo* %fb, i8* %2)
   %3 = bitcast [81 x i8]* %s to i8*
-  call void @foo_baz(%foo* %fb, i8* %3)
+  call void @foo__baz(%foo* %fb, i8* %3)
   ret void
 }
 
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_action_from_fb_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_action_from_fb_called_in_program.snap
index 4577ec2a96..15f2368dca 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_action_from_fb_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_action_from_fb_called_in_program.snap
@@ -15,7 +15,7 @@ source_filename = "<internal>"
 define void @bar(%bar* %0) {
 entry:
   %fb_inst = getelementptr inbounds %bar, %bar* %0, i32 0, i32 0
-  call void @fb_foo(%fb* %fb_inst)
+  call void @fb__foo(%fb* %fb_inst)
   ret void
 }
 
@@ -25,7 +25,7 @@ entry:
   ret void
 }
 
-define void @fb_foo(%fb* %0) {
+define void @fb__foo(%fb* %0) {
 entry:
   %x = getelementptr inbounds %fb, %fb* %0, i32 0, i32 0
   store i32 2, i32* %x, align 4
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_foreign_action_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_foreign_action_called_in_program.snap
index 2dc60feae3..5f2ef3954b 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_foreign_action_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_foreign_action_called_in_program.snap
@@ -14,7 +14,7 @@ source_filename = "<internal>"
 
 define void @bar(%bar* %0) {
 entry:
-  call void @prg_foo(%prg* @prg_instance)
+  call void @prg__foo(%prg* @prg_instance)
   ret void
 }
 
@@ -24,7 +24,7 @@ entry:
   ret void
 }
 
-define void @prg_foo(%prg* %0) {
+define void @prg__foo(%prg* %0) {
 entry:
   %x = getelementptr inbounds %prg, %prg* %0, i32 0, i32 0
   store i32 2, i32* %x, align 4
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_local_action_called_in_program.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_local_action_called_in_program.snap
index c4e5486ba8..1ae762f39e 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_local_action_called_in_program.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__code_gen_tests__qualified_local_action_called_in_program.snap
@@ -13,11 +13,11 @@ source_filename = "<internal>"
 define void @prg(%prg* %0) {
 entry:
   %x = getelementptr inbounds %prg, %prg* %0, i32 0, i32 0
-  call void @prg_foo(%prg* @prg_instance)
+  call void @prg__foo(%prg* @prg_instance)
   ret void
 }
 
-define void @prg_foo(%prg* %0) {
+define void @prg__foo(%prg* %0) {
 entry:
   %x = getelementptr inbounds %prg, %prg* %0, i32 0, i32 0
   store i32 2, i32* %x, align 4
diff --git a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__var_in_out_params_can_be_out_of_order.snap b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__var_in_out_params_can_be_out_of_order.snap
index 78c37314a1..1b188c51cc 100644
--- a/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__var_in_out_params_can_be_out_of_order.snap
+++ b/src/codegen/tests/snapshots/rusty__codegen__tests__parameters_tests__var_in_out_params_can_be_out_of_order.snap
@@ -29,10 +29,10 @@ entry:
   call void @fb_t(%fb_t* %fb)
   %load_out2 = load i8, i8* %out2, align 1
   %load_out1 = load i8, i8* %out1, align 1
-  call void @fb_t_foo(%fb_t* %fb)
+  call void @fb_t__foo(%fb_t* %fb)
   %load_out21 = load i8, i8* %out2, align 1
   %load_out12 = load i8, i8* %out1, align 1
-  call void @fb_t_foo(%fb_t* %fb)
+  call void @fb_t__foo(%fb_t* %fb)
   ret void
 }
 
@@ -46,7 +46,7 @@ entry:
   ret void
 }
 
-define void @fb_t_foo(%fb_t* %0) {
+define void @fb_t__foo(%fb_t* %0) {
 entry:
   %myVar = getelementptr inbounds %fb_t, %fb_t* %0, i32 0, i32 0
   %myInput = getelementptr inbounds %fb_t, %fb_t* %0, i32 0, i32 1
diff --git a/src/index.rs b/src/index.rs
index a29d51c14f..f7c591d33f 100644
--- a/src/index.rs
+++ b/src/index.rs
@@ -434,7 +434,7 @@ impl ImplementationIndexEntry {
 
     pub fn get_call_name_for_ir(&self) -> String {
         match self.implementation_type {
-            ImplementationType::Method | ImplementationType::Action => self.call_name.replace(".", "_"),
+            ImplementationType::Method | ImplementationType::Action => self.call_name.replace(".", "__"),
             _ => self.call_name.clone(),
         }
     }
diff --git a/src/tests/adr/initializer_functions_adr.rs b/src/tests/adr/initializer_functions_adr.rs
index 0dc08c1cc2..9dead18eeb 100644
--- a/src/tests/adr/initializer_functions_adr.rs
+++ b/src/tests/adr/initializer_functions_adr.rs
@@ -813,7 +813,7 @@ fn initializing_method_variables() {
       ret void
     }
 
-    define void @foo_bar(%foo* %0) {
+    define void @foo__bar(%foo* %0) {
     entry:
       %x = alloca i32, align 4
       %px = alloca i32*, align 8
@@ -886,7 +886,7 @@ fn initializing_method_variables() {
       ret void
     }
 
-    define void @foo_bar(%foo* %0) {
+    define void @foo__bar(%foo* %0) {
     entry:
       %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %px = alloca i32*, align 8
@@ -895,7 +895,7 @@ fn initializing_method_variables() {
       ret void
     }
 
-    define void @foo_baz(%foo* %0) {
+    define void @foo__baz(%foo* %0) {
     entry:
       %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %px = alloca i32*, align 8
@@ -956,7 +956,7 @@ fn initializing_method_variables() {
       ret void
     }
 
-    define void @foo_bar(%foo* %0) {
+    define void @foo__bar(%foo* %0) {
     entry:
       %x = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
       %x1 = alloca i32, align 4
diff --git a/tests/integration/snapshots/tests__integration__cfc__ir__actions_debug.snap b/tests/integration/snapshots/tests__integration__cfc__ir__actions_debug.snap
index 3fbb9d5812..cf8da06223 100644
--- a/tests/integration/snapshots/tests__integration__cfc__ir__actions_debug.snap
+++ b/tests/integration/snapshots/tests__integration__cfc__ir__actions_debug.snap
@@ -14,12 +14,12 @@ entry:
   %a = getelementptr inbounds %main, %main* %0, i32 0, i32 0
   %b = getelementptr inbounds %main, %main* %0, i32 0, i32 1
   store i32 0, i32* %a, align 4, !dbg !18
-  call void @main_newAction(%main* %0), !dbg !17
-  call void @main_newAction2(%main* %0), !dbg !19
+  call void @main__newAction(%main* %0), !dbg !17
+  call void @main__newAction2(%main* %0), !dbg !19
   ret void, !dbg !20
 }
 
-define void @main_newAction(%main* %0) !dbg !21 {
+define void @main__newAction(%main* %0) !dbg !21 {
 entry:
   call void @llvm.dbg.declare(metadata %main* %0, metadata !22, metadata !DIExpression()), !dbg !23
   %a = getelementptr inbounds %main, %main* %0, i32 0, i32 0
@@ -30,7 +30,7 @@ entry:
   ret void, !dbg !24
 }
 
-define void @main_newAction2(%main* %0) !dbg !25 {
+define void @main__newAction2(%main* %0) !dbg !25 {
 entry:
   call void @llvm.dbg.declare(metadata %main* %0, metadata !26, metadata !DIExpression()), !dbg !27
   %a = getelementptr inbounds %main, %main* %0, i32 0, i32 0
diff --git a/tests/lit/multi/extern_C_fb_init/foo.c b/tests/lit/multi/extern_C_fb_init/foo.c
index 47f2db666e..b2d7e5febf 100644
--- a/tests/lit/multi/extern_C_fb_init/foo.c
+++ b/tests/lit/multi/extern_C_fb_init/foo.c
@@ -7,7 +7,7 @@ typedef struct {
 
 myFunctionBlock __myFunctionBlock__init = { 0 };
 
-void myFunctionBlock_FB_INIT(myFunctionBlock* fb_instance) {
+void myFunctionBlock__FB_INIT(myFunctionBlock* fb_instance) {
     fb_instance->a = 1;
     fb_instance->b = 2;
     printf("myFunctionBlock initialized with a = %d, b = %d\n", fb_instance->a, fb_instance->b);

From a7bfcbfb5602f18731e44ec8917c2879fd56e394 Mon Sep 17 00:00:00 2001
From: Michael Haselberger <Michael.HASELBERGER@bachmann.info>
Date: Mon, 28 Apr 2025 07:13:50 +0200
Subject: [PATCH 9/9] add test for user_init with stack-variables

---
 .../complex_initializers.rs                   | 127 +++++++++++++++---
 .../init/user_init_for_stack_variable.st      |  13 ++
 2 files changed, 124 insertions(+), 16 deletions(-)
 create mode 100644 tests/lit/single/init/user_init_for_stack_variable.st

diff --git a/src/codegen/tests/initialization_test/complex_initializers.rs b/src/codegen/tests/initialization_test/complex_initializers.rs
index 1baef9d33d..136532c900 100644
--- a/src/codegen/tests/initialization_test/complex_initializers.rs
+++ b/src/codegen/tests/initialization_test/complex_initializers.rs
@@ -148,18 +148,10 @@ fn init_functions_generated_for_programs() {
       ret void
     }
 
-    define void @__user_init_PLC_PRG(%PLC_PRG* %0) {
-    entry:
-      %self = alloca %PLC_PRG*, align 8
-      store %PLC_PRG* %0, %PLC_PRG** %self, align 8
-      ret void
-    }
-
     define void @__init___Test() {
     entry:
       call void @__init_plc_prg(%PLC_PRG* @PLC_PRG_instance)
       call void @__user_init_PLC_PRG(%PLC_PRG* @PLC_PRG_instance)
-      call void @__user_init_PLC_PRG(%PLC_PRG* @PLC_PRG_instance)
       ret void
     }
     "#);
@@ -567,7 +559,6 @@ fn nested_initializer_pous() {
 }
 
 #[test]
-#[ignore = "initializing references in same POU not yet supported"]
 fn local_address() {
     let res = generate_to_string(
         "Test",
@@ -584,12 +575,50 @@ fn local_address() {
     )
     .unwrap();
 
-    insta::assert_snapshot!(res, @r###""###);
+    insta::assert_snapshot!(res, @r#"
+    ; ModuleID = '<internal>'
+    source_filename = "<internal>"
+
+    %foo = type { i16, i16* }
+
+    @__foo__init = constant %foo zeroinitializer
+    @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 0, void ()* @__init___Test, i8* null }]
+
+    define void @foo(%foo* %0) {
+    entry:
+      %i = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
+      %pi = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
+      ret void
+    }
+
+    define void @__init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      %deref = load %foo*, %foo** %self, align 8
+      %pi = getelementptr inbounds %foo, %foo* %deref, i32 0, i32 1
+      %deref1 = load %foo*, %foo** %self, align 8
+      %i = getelementptr inbounds %foo, %foo* %deref1, i32 0, i32 0
+      store i16* %i, i16** %pi, align 8
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
+    define void @__init___Test() {
+    entry:
+      ret void
+    }
+    "#);
 }
 
 #[test]
-#[ignore = "initializing references in same POU not yet supported"]
-fn tmpo() {
+fn user_init_called_for_variables_on_stack() {
     let result = generate_to_string(
         "Test",
         vec![SourceCode::from(
@@ -599,17 +628,83 @@ fn tmpo() {
                 i : INT;
                 pi: REF_TO INT;
             END_VAR
+                METHOD FB_INIT
+                  pi := ADR(i);
+                END_METHOD
             END_FUNCTION_BLOCK
 
-            ACTION foo.init
-            pi := REF(i);
-            END_ACTION
+            FUNCTION main
+            VAR
+                fb: foo;
+            END_VAR
+                fb();
+            END_FUNCTION
             "#,
         )],
     )
     .unwrap();
 
-    insta::assert_snapshot!(result, @r###""###);
+    insta::assert_snapshot!(result, @r#"
+    ; ModuleID = '<internal>'
+    source_filename = "<internal>"
+
+    %foo = type { i16, i16* }
+
+    @__foo__init = constant %foo zeroinitializer
+    @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 0, void ()* @__init___Test, i8* null }]
+
+    define void @foo(%foo* %0) {
+    entry:
+      %i = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
+      %pi = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
+      ret void
+    }
+
+    define void @foo__FB_INIT(%foo* %0) {
+    entry:
+      %i = getelementptr inbounds %foo, %foo* %0, i32 0, i32 0
+      %pi = getelementptr inbounds %foo, %foo* %0, i32 0, i32 1
+      store i16* %i, i16** %pi, align 8
+      ret void
+    }
+
+    define void @main() {
+    entry:
+      %fb = alloca %foo, align 8
+      %0 = bitcast %foo* %fb to i8*
+      call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %0, i8* align 1 bitcast (%foo* @__foo__init to i8*), i64 ptrtoint (%foo* getelementptr (%foo, %foo* null, i32 1) to i64), i1 false)
+      call void @__init_foo(%foo* %fb)
+      call void @__user_init_foo(%foo* %fb)
+      call void @foo(%foo* %fb)
+      ret void
+    }
+
+    ; Function Attrs: argmemonly nofree nounwind willreturn
+    declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg) #0
+
+    define void @__init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      ret void
+    }
+
+    define void @__user_init_foo(%foo* %0) {
+    entry:
+      %self = alloca %foo*, align 8
+      store %foo* %0, %foo** %self, align 8
+      %deref = load %foo*, %foo** %self, align 8
+      call void @foo__FB_INIT(%foo* %deref)
+      ret void
+    }
+
+    define void @__init___Test() {
+    entry:
+      ret void
+    }
+
+    attributes #0 = { argmemonly nofree nounwind willreturn }
+    "#);
 }
 
 #[test]
diff --git a/tests/lit/single/init/user_init_for_stack_variable.st b/tests/lit/single/init/user_init_for_stack_variable.st
new file mode 100644
index 0000000000..24009e7fd5
--- /dev/null
+++ b/tests/lit/single/init/user_init_for_stack_variable.st
@@ -0,0 +1,13 @@
+// RUN: (%COMPILE %s && %RUN) | %CHECK %s
+FUNCTION_BLOCK foo
+    METHOD FB_INIT
+        printf('FB_INIT called$N');
+    END_METHOD
+END_FUNCTION_BLOCK
+
+FUNCTION main
+VAR
+    fb: foo;
+END_VAR
+    // CHECK: FB_INIT called
+END_FUNCTION
\ No newline at end of file