commit a9e269e661ca7def681b69f2b88acf0c1fa3e654
author Bill Wendling <isanbard@gmail.com> Tue Nov 29 00:10:10 2011 +0000
committer Bill Wendling <isanbard@gmail.com> Tue Nov 29 00:10:10 2011 +0000
tree 45b89ab9079bd1a5bc6d7764f2ad94c02f696cb2
parent a74ec5c314178a7e73bbaa7d406eb5079ef8ef26

The _setjmp builtin library function should have the "returns twice"
attribute. This prevents the stack slot allocator from coming along and using a
stack which it thinks is available but isn't.
<rdar://problem/10492556>


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@145332 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGObjCMac.cpp

diff --git a/lib/CodeGen/CGObjCMac.cpp b/lib/CodeGen/CGObjCMac.cpp
index 1cbcc58..1db50a8 100644
--- a/lib/CodeGen/CGObjCMac.cpp
+++ b/lib/CodeGen/CGObjCMac.cpp
@@ -516,7 +516,8 @@
     llvm::Type *params[] = { CGM.Int32Ty->getPointerTo() };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.Int32Ty,
                                                              params, false),
-                                     "_setjmp");
+                                     "_setjmp",
+                                     llvm::Attribute::ReturnsTwice);
   }
 
 public: