From 6b4ebcc653b63c544a9eca39441e85a5a18f140f Mon Sep 17 00:00:00 2001
From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Mon, 15 Oct 2012 00:23:07 +0000
Subject: At -O0, emit an @llvm.trap() call at the end of a value-returning
 function which fails to return a value, to make debugging this issue easier.

llvm-svn: 165914
---
 clang/lib/CodeGen/CodeGenFunction.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'clang/lib/CodeGen/CodeGenFunction.cpp')

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index 8562d79..5f71af8 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -547,6 +547,8 @@ void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn,
       EmitCheck(Builder.getFalse(), "missing_return",
                 EmitCheckSourceLocation(FD->getLocation()),
                 llvm::ArrayRef<llvm::Value*>());
+    else if (CGM.getCodeGenOpts().OptimizationLevel == 0)
+      Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::trap));
     Builder.CreateUnreachable();
     Builder.ClearInsertionPoint();
   }
-- 
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