[WebAssembly] Add new `export_name` clang attribute for controlling wasm export names
This is equivalent to the existing `import_name` and `import_module`
attributes which control the import names in the final wasm binary
produced by lld.
This maps the existing
This attribute currently requires a string rather than using the
symbol name for a couple of reasons:
1. Avoid confusion with static and dynamic linking which is
based on symbol name. Exporting a function from a wasm module using
this directive is orthogonal to both static and dynamic linking.
2. Avoids name mangling.
Differential Revision: https://reviews.llvm.org/D70520
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index 33e7b18..9fd4a5f 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -779,6 +779,12 @@
B.addAttribute("wasm-import-name", Attr->getImportName());
Fn->addAttributes(llvm::AttributeList::FunctionIndex, B);
}
+ if (const auto *Attr = FD->getAttr<WebAssemblyExportNameAttr>()) {
+ llvm::Function *Fn = cast<llvm::Function>(GV);
+ llvm::AttrBuilder B;
+ B.addAttribute("wasm-export-name", Attr->getExportName());
+ Fn->addAttributes(llvm::AttributeList::FunctionIndex, B);
+ }
}
if (auto *FD = dyn_cast_or_null<FunctionDecl>(D)) {