fix: recognize the synthetic wrapping component in codegen when compiling a pure Rust

program.

Author: greenhat

codegen/masm/src/lower/component.rs

@@ -45,7 +45,18 @@ impl ToMasmComponent for builtin::Component {
                 let name = masm::ProcedureName::from_raw_parts(masm::Ident::from_raw_parts(
                     Span::new(entry_id.function.span, entry_id.function.as_str().into()),
                 ));
-                let path = LibraryPath::new(entry_id.module).into_diagnostic()?;
+
+                let path = if component_path.to_string() == "root_ns:[email protected]" {
+                    // We're inside the synthethic "wrapping" component for pure Rust program
+                    // compilation. Since the user does not know about it their entrypoint does not
+                    // include the synthetic component id. Append the user-provided entrypoint
+                    // module
+                    component_path.clone().append_unchecked(entry_id.module)
+                } else {
+                    // We're compiling a Wasm component and the component id is included
+                    // in the entrypoint.
+                    LibraryPath::new(entry_id.module).into_diagnostic()?
+                };
                 Some(masm::InvocationTarget::AbsoluteProcedurePath { name, path })
             }
             None => None,

tests/integration/src/testing/setup.rs

@@ -88,8 +88,9 @@ pub fn build_empty_component_for_test(context: Rc<Context>) -> LinkOutput {
     };
     let mut world_builder = WorldBuilder::new(world);
     let name = Ident::with_empty_span("root".into());
+    let ns_name = Ident::with_empty_span("root_ns".into());
     let component = world_builder
-        .define_component(name, name, Version::new(1, 0, 0))
+        .define_component(ns_name, name, Version::new(1, 0, 0))
         .unwrap_or_else(|err| panic!("failed to define component:\n{}", format_report(err)));
 
     let mut link_output = LinkOutput {