Fix replacing all the users of objc weak runtime routines
when deleting them. rdar://11434915.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157080 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/ObjCARC.cpp b/lib/Transforms/Scalar/ObjCARC.cpp
index ce4a195..c4ab42d 100644
--- a/lib/Transforms/Scalar/ObjCARC.cpp
+++ b/lib/Transforms/Scalar/ObjCARC.cpp
@@ -3486,8 +3486,18 @@
for (Value::use_iterator UI = Alloca->use_begin(),
UE = Alloca->use_end(); UI != UE; ) {
CallInst *UserInst = cast<CallInst>(*UI++);
- if (!UserInst->use_empty())
- UserInst->replaceAllUsesWith(UserInst->getArgOperand(0));
+ switch (GetBasicInstructionClass(UserInst)) {
+ case IC_InitWeak:
+ case IC_StoreWeak:
+ // These functions return their second argument.
+ UserInst->replaceAllUsesWith(UserInst->getArgOperand(1));
+ break;
+ case IC_DestroyWeak:
+ // No return value.
+ break;
+ default:
+ break;
+ }
UserInst->eraseFromParent();
}
Alloca->eraseFromParent();