codegen: use correct rettype ABI for aotcompile (#57082)

This only really can differ in aotcompile, so it was hard to notice that
that the attempted code simplification in db25494 wasn't correct and
could lead to ABI mismatches at runtime.

Fixes #57018

src/aotcompile.cpp

@@ -2223,7 +2223,7 @@ void jl_get_llvmf_defn_impl(jl_llvmf_dump_t* dump, jl_method_instance_t *mi, jl_
             output.imaging_mode = jl_options.image_codegen;
             output.temporary_roots = jl_alloc_array_1d(jl_array_any_type, 0);
             JL_GC_PUSH1(&output.temporary_roots);
-            auto decls = jl_emit_code(m, mi, src, NULL, output);
+            auto decls = jl_emit_code(m, mi, src, mi->specTypes, src->rettype, output);
             output.temporary_roots = nullptr;
             JL_GC_POP(); // GC the global_targets array contents now since reflection doesn't need it
 

src/codegen.cpp

@@ -4381,7 +4381,7 @@ static jl_llvm_functions_t
         jl_method_instance_t *lam,
         jl_code_info_t *src,
         jl_value_t *abi,
-        jl_value_t *rettype,
+        jl_value_t *jlrettype,
         jl_codegen_params_t &params);
 
 static void emit_hasnofield_error_ifnot(jl_codectx_t &ctx, Value *ok, jl_datatype_t *type, jl_cgval_t name);
@@ -5533,12 +5533,12 @@ static jl_value_t *get_ci_abi(jl_code_instance_t *ci)
     return jl_get_ci_mi(ci)->specTypes;
 }
 
-static jl_cgval_t emit_call_specfun_other(jl_codectx_t &ctx, jl_code_instance_t *ci, jl_value_t *jlretty, StringRef specFunctionObject, jl_code_instance_t *fromexternal,
+static jl_cgval_t emit_call_specfun_other(jl_codectx_t &ctx, jl_code_instance_t *ci, StringRef specFunctionObject, jl_code_instance_t *fromexternal,
     ArrayRef<jl_cgval_t> argv, size_t nargs, jl_returninfo_t::CallingConv *cc, unsigned *return_roots, jl_value_t *inferred_retty, Value *age_ok)
 {
     jl_method_instance_t *mi = jl_get_ci_mi(ci);
     bool is_opaque_closure = jl_is_method(mi->def.value) && mi->def.method->is_for_opaque_closure;
-    return emit_call_specfun_other(ctx, is_opaque_closure, get_ci_abi(ci), jlretty, NULL,
+    return emit_call_specfun_other(ctx, is_opaque_closure, get_ci_abi(ci), ci->rettype, NULL,
         specFunctionObject, fromexternal, argv, nargs, cc, return_roots, inferred_retty, age_ok);
 }
 
@@ -5688,7 +5688,7 @@ static jl_cgval_t emit_invoke(jl_codectx_t &ctx, const jl_cgval_t &lival, ArrayR
                         jl_returninfo_t::CallingConv cc = jl_returninfo_t::CallingConv::Boxed;
                         unsigned return_roots = 0;
                         if (specsig)
-                            result = emit_call_specfun_other(ctx, codeinst, codeinst->rettype, protoname, external ? codeinst : nullptr, argv, nargs, &cc, &return_roots, rt, age_ok);
+                            result = emit_call_specfun_other(ctx, codeinst, protoname, external ? codeinst : nullptr, argv, nargs, &cc, &return_roots, rt, age_ok);
                         else
                             result = emit_call_specfun_boxed(ctx, codeinst->rettype, protoname, external ? codeinst : nullptr, argv, nargs, rt, age_ok);
                         if (need_to_emit) {
@@ -10029,7 +10029,8 @@ jl_llvm_functions_t jl_emit_code(
         orc::ThreadSafeModule &m,
         jl_method_instance_t *li,
         jl_code_info_t *src,
-        jl_value_t *abi,
+        jl_value_t *abi_at,
+        jl_value_t *abi_rt,
         jl_codegen_params_t &params)
 {
     JL_TIMING(CODEGEN, CODEGEN_LLVM);
@@ -10038,10 +10039,8 @@ jl_llvm_functions_t jl_emit_code(
     assert((params.params == &jl_default_cgparams /* fast path */ || !params.cache ||
         compare_cgparams(params.params, &jl_default_cgparams)) &&
         "functions compiled with custom codegen params must not be cached");
-    if (!abi)
-        abi = li->specTypes;
     JL_TRY {
-        decls = emit_function(m, li, src, abi, src->rettype, params);
+        decls = emit_function(m, li, src, abi_at, abi_rt, params);
         auto stream = *jl_ExecutionEngine->get_dump_emitted_mi_name_stream();
         if (stream) {
             jl_printf(stream, "%s\t", decls.specFunctionObject.c_str());
@@ -10112,7 +10111,7 @@ jl_llvm_functions_t jl_emit_codeinst(
         return jl_llvm_functions_t(); // user error
     }
     //assert(jl_egal((jl_value_t*)jl_atomic_load_relaxed(&codeinst->debuginfo), (jl_value_t*)src->debuginfo) && "trying to generate code for a codeinst for an incompatible src");
-    jl_llvm_functions_t decls = jl_emit_code(m, jl_get_ci_mi(codeinst), src, get_ci_abi(codeinst), params);
+    jl_llvm_functions_t decls = jl_emit_code(m, jl_get_ci_mi(codeinst), src, get_ci_abi(codeinst), codeinst->rettype, params);
     return decls;
 }
 

src/jitlayers.h

@@ -278,7 +278,8 @@ jl_llvm_functions_t jl_emit_code(
         orc::ThreadSafeModule &M,
         jl_method_instance_t *mi,
         jl_code_info_t *src,
-        jl_value_t *abi,
+        jl_value_t *abi_at,
+        jl_value_t *abi_rt,
         jl_codegen_params_t &params);
 
 jl_llvm_functions_t jl_emit_codeinst(