From 772ef50bf1fe91f1a642d9cae1f793f851f423d4 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 22 Mar 2010 23:15:57 +0000
Subject: [PATCH] Fix PR6673: updating the callback should not clear the map.

llvm-svn: 99227
---
 lib/CodeGen/MachineModuleInfo.cpp  |  6 +++++-
 test/CodeGen/Generic/addr-label.ll | 23 +++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/lib/CodeGen/MachineModuleInfo.cpp b/lib/CodeGen/MachineModuleInfo.cpp
index af48e9ebb5b..ad4f01b7a9a 100644
--- a/lib/CodeGen/MachineModuleInfo.cpp
+++ b/lib/CodeGen/MachineModuleInfo.cpp
@@ -44,6 +44,10 @@ public:
   MMIAddrLabelMapCallbackPtr() : Map(0) {}
   MMIAddrLabelMapCallbackPtr(Value *V) : CallbackVH(V), Map(0) {}
   
+  void setPtr(BasicBlock *BB) {
+    ValueHandleBase::operator=(BB);
+  }
+    
   void setMap(MMIAddrLabelMap *map) { Map = map; }
   
   virtual void deleted();
@@ -209,7 +213,7 @@ void MMIAddrLabelMap::UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New) {
 
   // If New is not address taken, just move our symbol over to it.
   if (NewEntry.Symbols.isNull()) {
-    BBCallbacks[OldEntry.Index] = New;    // Update the callback.
+    BBCallbacks[OldEntry.Index].setPtr(New);    // Update the callback.
     NewEntry = OldEntry;     // Set New's entry.
     return;
   }
diff --git a/test/CodeGen/Generic/addr-label.ll b/test/CodeGen/Generic/addr-label.ll
index 51741110e07..0dbe5021bbf 100644
--- a/test/CodeGen/Generic/addr-label.ll
+++ b/test/CodeGen/Generic/addr-label.ll
@@ -56,3 +56,26 @@ ret:
 	ret i32 -1
 }
 
+
+; PR6673
+
+define i64 @test4a() {
+	%target = bitcast i8* blockaddress(@test4b, %usermain) to i8*
+	%ret = call i64 @test4b(i8* %target)
+
+	ret i64 %ret
+}
+
+define i64 @test4b(i8* %Code) {
+entry:
+	indirectbr i8* %Code, [label %usermain]
+usermain:
+	br label %label_line_0
+
+label_line_0:
+	br label %label_line_1
+
+label_line_1:
+	%target = ptrtoint i8* blockaddress(@test4b, %label_line_0) to i64
+	ret i64 %target
+}