From be349def4b71ae15be9877f1ae366ce41f5780e3 Mon Sep 17 00:00:00 2001
From: John McCall <rjmccall@apple.com>
Date: Thu, 8 Jul 2010 06:48:12 +0000
Subject: Mark calls to 'throw()' functions as nounwind, and mark the functions
 nounwind as well.

llvm-svn: 107858
---
 clang/lib/CodeGen/CGCall.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'clang/lib/CodeGen')

diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index 0a17e56d727..1632cb3c22b 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -684,6 +684,12 @@ void CodeGenModule::ConstructAttributeList(const CGFunctionInfo &FI,
   if (TargetDecl) {
     if (TargetDecl->hasAttr<NoThrowAttr>())
       FuncAttrs |= llvm::Attribute::NoUnwind;
+    else if (const FunctionDecl *Fn = dyn_cast<FunctionDecl>(TargetDecl)) {
+      const FunctionProtoType *FPT = Fn->getType()->getAs<FunctionProtoType>();
+      if (FPT && FPT->hasEmptyExceptionSpec())
+        FuncAttrs |= llvm::Attribute::NoUnwind;
+    }
+
     if (TargetDecl->hasAttr<NoReturnAttr>())
       FuncAttrs |= llvm::Attribute::NoReturn;
     if (TargetDecl->hasAttr<ConstAttr>())
-- 
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