[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/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 60a9980..e83688c 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -5754,6 +5754,28 @@
Rec->addAttr(::new (S.Context) BPFPreserveAccessIndexAttr(S.Context, AL));
}
+static void handleWebAssemblyExportNameAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
+ if (!isFunctionOrMethod(D)) {
+ S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
+ << "'export_name'" << ExpectedFunction;
+ return;
+ }
+
+ auto *FD = cast<FunctionDecl>(D);
+ if (FD->isThisDeclarationADefinition()) {
+ S.Diag(D->getLocation(), diag::err_alias_is_definition) << FD << 0;
+ return;
+ }
+
+ StringRef Str;
+ SourceLocation ArgLoc;
+ if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &ArgLoc))
+ return;
+
+ FD->addAttr(::new (S.Context)
+ WebAssemblyExportNameAttr(S.Context, AL, Str));
+}
+
static void handleWebAssemblyImportModuleAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!isFunctionOrMethod(D)) {
S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
@@ -6672,6 +6694,9 @@
case ParsedAttr::AT_BPFPreserveAccessIndex:
handleBPFPreserveAccessIndexAttr(S, D, AL);
break;
+ case ParsedAttr::AT_WebAssemblyExportName:
+ handleWebAssemblyExportNameAttr(S, D, AL);
+ break;
case ParsedAttr::AT_WebAssemblyImportModule:
handleWebAssemblyImportModuleAttr(S, D, AL);
break;