From 6fd7d680b0a6d101cbeb93f16f3e90a14d8c4fe9 Mon Sep 17 00:00:00 2001
From: Sam Clegg <sbc@chromium.org>
Date: Mon, 25 Jun 2018 18:47:32 +0000
Subject: [WebAssembly] Add no-prototype attribute to prototype-less C
 functions

The WebAssembly backend in particular benefits from being
able to distinguish between varargs functions (...) and prototype-less
C functions.

Differential Revision: https://reviews.llvm.org/D48443

llvm-svn: 335510
---
 clang/lib/CodeGen/TargetInfo.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'clang/lib')

diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index b29bcce237c..3fcafbbfd37 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -747,6 +747,15 @@ class WebAssemblyTargetCodeGenInfo final : public TargetCodeGenInfo {
 public:
   explicit WebAssemblyTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT)
       : TargetCodeGenInfo(new WebAssemblyABIInfo(CGT)) {}
+
+  void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+                           CodeGen::CodeGenModule &CGM) const override {
+    if (auto *FD = dyn_cast_or_null<FunctionDecl>(D)) {
+      llvm::Function *Fn = cast<llvm::Function>(GV);
+      if (!FD->doesThisDeclarationHaveABody() && !FD->hasPrototype())
+        Fn->addFnAttr("no-prototype");
+    }
+  }
 };
 
 /// Classify argument of given type \p Ty.
-- 
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