commit 802cd5b1974bab2038b9d3c969d9beb0ab34f435
author Richard Smith <richard-llvm@metafoo.co.uk> Mon Oct 15 00:23:07 2012 +0000
committer Richard Smith <richard-llvm@metafoo.co.uk> Mon Oct 15 00:23:07 2012 +0000
tree e8beb1b6f1bffafeb96c93264dd924fd6625d323
parent a2e94892e273423e2f772f989921cda6442a66c4

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.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165914 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CodeGenFunction.cpp

diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp
index 8562d79..5f71af8 100644
--- a/lib/CodeGen/CodeGenFunction.cpp
+++ b/lib/CodeGen/CodeGenFunction.cpp
@@ -547,6 +547,8 @@
       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();
   }