From 4edab1a9e8fd28a60b2d09cc38333652155c0a20 Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 28 Sep 2010 22:36:56 +0000
Subject: [PATCH] Fix a FIXME. _foo.eh symbols are currently always exported so
 that the linker knows about them. This is not necessary on 10.6 and later.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114997 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/TargetLoweringObjectFileImpl.cpp | 18 ++++-----------
 test/CodeGen/X86/non-globl-eh-frame.ll       | 24 ++++++++++++++++++++
 2 files changed, 29 insertions(+), 13 deletions(-)
 create mode 100644 test/CodeGen/X86/non-globl-eh-frame.ll

diff --git a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 4afdc3ddef5..0f36d4296f6 100644
--- a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -444,27 +444,19 @@ getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
 
 void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
                                                const TargetMachine &TM) {
-  // _foo.eh symbols are currently always exported so that the linker knows
-  // about them.  This is not necessary on 10.6 and later, but it
-  // doesn't hurt anything.
-  // FIXME: I need to get this from Triple.
   IsFunctionEHSymbolGlobal = true;
   IsFunctionEHFrameSymbolPrivate = false;
   SupportsWeakOmittedEHFrame = false;
 
   Triple T(((LLVMTargetMachine&)TM).getTargetTriple());
   if (T.getOS() == Triple::Darwin) {
-    switch (T.getDarwinMajorNumber()) {
-    case 7:  // 10.3 Panther.
-    case 8:  // 10.4 Tiger.
+    unsigned MajNum = T.getDarwinMajorNumber();
+    if (MajNum == 7 || MajNum == 8) // 10.3 Panther, 10.4 Tiger
       CommDirectiveSupportsAlignment = false;
-      break;
-    case 9:   // 10.5 Leopard.
-    case 10:  // 10.6 SnowLeopard.
-      break;
-    }
+    if (MajNum > 9)                 // 10.6 SnowLeopard
+      IsFunctionEHSymbolGlobal = false;
   }
-  
+
   TargetLoweringObjectFile::Initialize(Ctx, TM);
 
   TextSection // .text
diff --git a/test/CodeGen/X86/non-globl-eh-frame.ll b/test/CodeGen/X86/non-globl-eh-frame.ll
new file mode 100644
index 00000000000..71349ecafeb
--- /dev/null
+++ b/test/CodeGen/X86/non-globl-eh-frame.ll
@@ -0,0 +1,24 @@
+; RUN: llc < %s -mtriple x86_64-apple-darwin10 -march x86 | not grep {{.globl\[\[:space:\]\]*__Z4funcv.eh}}
+; RUN: llc < %s -mtriple x86_64-apple-darwin9  -march x86 | FileCheck %s -check-prefix=DARWIN9
+
+%struct.__pointer_type_info_pseudo = type { %struct.__type_info_pseudo, i32, %"struct.std::type_info"* }
+%struct.__type_info_pseudo = type { i8*, i8* }
+%"struct.std::type_info" = type opaque
+
+@.str = private constant [12 x i8] c"hello world\00", align 1
+@_ZTIPc = external constant %struct.__pointer_type_info_pseudo
+
+define void @_Z4funcv() noreturn optsize ssp {
+entry:
+  %0 = tail call i8* @__cxa_allocate_exception(i64 8) nounwind
+  %1 = bitcast i8* %0 to i8**
+  store i8* getelementptr inbounds ([12 x i8]* @.str, i64 0, i64 0), i8** %1, align 8
+  tail call void @__cxa_throw(i8* %0, i8* bitcast (%struct.__pointer_type_info_pseudo* @_ZTIPc to i8*), void (i8*)* null) noreturn
+  unreachable
+}
+
+; DARWIN9: .globl __Z4funcv.eh
+
+declare i8* @__cxa_allocate_exception(i64) nounwind
+
+declare void @__cxa_throw(i8*, i8*, void (i8*)*) noreturn