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Use CallbackVH, instead of WeakVH, to hold MDNode elements.

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Use FoldingSetNode to unique MDNodes in a context.
Use CallbackVH hooks to update context's MDNodeSet appropriately.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80839 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2009-09-02 21:22:09 +00:00
parent 69d1c1aebf
commit d9489cbb0c
8 changed files with 145 additions and 45 deletions
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lib/VMCore/LLVMContext.cpp
+5 -4
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@@ -13,6 +13,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/LLVMContext.h"
#include "llvm/Metadata.h"
#include "llvm/Constants.h"
#include "llvm/Instruction.h"
#include "llvm/Support/ManagedStatic.h"
@@ -48,10 +49,10 @@ bool LLVMContext::RemoveDeadMetadata() {
bool Changed = false;
while (1) {
for (SmallPtrSet<const MDNode *, 8>::iterator
I = pImpl->MDNodes.begin(),
E = pImpl->MDNodes.end(); I != E; ++I) {
const MDNode *N = cast<MDNode>(*I);
for (FoldingSet<MDNode>::iterator
I = pImpl->MDNodeSet.begin(),
E = pImpl->MDNodeSet.end(); I != E; ++I) {
const MDNode *N = &(*I);
if (N->use_empty())
DeadMDNodes.push_back(N);
}