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Copy metadata when value is RAUW'd. It is debatable whether this is the right approach for custom metadata data in general. However, right now the only custom data user, "dbg", expects this behavior while FE is constructing llvm IR with debug info.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83977 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2009-10-13 17:00:54 +00:00
parent 39a38ae529
commit 740d0db812
3 changed files with 17 additions and 0 deletions
include/llvm
Metadata.h
lib/VMCore
Metadata.cppValue.cpp

1
include/llvm/Metadata.h

@ -361,6 +361,7 @@ public:
void ValueIsDeleted(const Instruction *Inst) {
removeMDs(Inst);
}
void ValueIsRAUWd(Value *V1, Value *V2);
/// ValueIsCloned - This handler is used to update metadata store
/// when In1 is cloned to create In2.

12
lib/VMCore/Metadata.cpp

@ -404,3 +404,15 @@ void MetadataContext::ValueIsCloned(const Instruction *In1, Instruction *In2) {
if (MDNode *MD = dyn_cast_or_null<MDNode>(I->second))
addMD(I->first, MD, In2);
}
/// ValueIsRAUWd - This handler is used when V1's all uses are replaced by
/// V2.
void MetadataContext::ValueIsRAUWd(Value *V1, Value *V2) {
Instruction *I1 = dyn_cast<Instruction>(V1);
Instruction *I2 = dyn_cast<Instruction>(V2);
if (!I1 || !I2)
return;
// FIXME : Give custom handlers a chance to override this.
ValueIsCloned(I1, I2);
}

4
lib/VMCore/Value.cpp

@ -309,6 +309,10 @@ void Value::uncheckedReplaceAllUsesWith(Value *New) {
// Notify all ValueHandles (if present) that this value is going away.
if (HasValueHandle)
ValueHandleBase::ValueIsRAUWd(this, New);
if (HasMetadata) {
LLVMContext &Context = getContext();
Context.pImpl->TheMetadata.ValueIsRAUWd(this, New);
}
while (!use_empty()) {
Use &U = *UseList;