From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 29 Nov 2011 00:10:10 +0000 (+0000)
Subject: The _setjmp builtin library function should have the "returns twice"
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a9e269e661ca7def681b69f2b88acf0c1fa3e654;p=clang

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
---

diff --git a/lib/CodeGen/CGObjCMac.cpp b/lib/CodeGen/CGObjCMac.cpp
index 1cbcc58ae5..1db50a8f57 100644
--- a/lib/CodeGen/CGObjCMac.cpp
+++ b/lib/CodeGen/CGObjCMac.cpp
@@ -516,7 +516,8 @@ public:
     llvm::Type *params[] = { CGM.Int32Ty->getPointerTo() };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.Int32Ty,
                                                              params, false),
-                                     "_setjmp");
+                                     "_setjmp",
+                                     llvm::Attribute::ReturnsTwice);
   }
 
 public: