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Fix DebugInfo replaceAllUsesWith.

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Summary:
replaceAllUsesWith had been modified to allow a DbgNode value to be
replaced by itself. In that case a new node is created by copying the
current DbgNode and the copy is used as replacement value.

When that copying happens, the value stored in this->DbgNode at the end
of RAUW would be a reference to the Node that has just been deleted.

This doesn't produce any bug right now, because the DI node on which we
call RAUW won't be used again.

Reviewers: dblaikie, echristo, aprantl

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5326

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217749 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Frederic Riss 2014-09-15 07:50:42 +00:00
parent 04dc1486ac
commit 740506d9ca
1 changed files with 1 additions and 1 deletions
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2
lib/IR/DebugInfo.cpp
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@ -384,7 +384,7 @@ void DIDescriptor::replaceAllUsesWith(LLVMContext &VMContext, DIDescriptor D) {
const Value *V = cast_or_null<Value>(DN); const Value *V = cast_or_null<Value>(DN);
Node->replaceAllUsesWith(const_cast<Value *>(V)); Node->replaceAllUsesWith(const_cast<Value *>(V));
MDNode::deleteTemporary(Node); MDNode::deleteTemporary(Node);
DbgNode = D; DbgNode = DN;
} }
/// replaceAllUsesWith - Replace all uses of the MDNode used by this /// replaceAllUsesWith - Replace all uses of the MDNode used by this