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Map MDNode correctly.

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A non function local MDNode can have an operand which is cloned by MapValue(). 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109117 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2010-07-22 16:35:00 +00:00
parent f06eb3719a
commit bd68d42843
1 changed files with 27 additions and 6 deletions
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33
lib/Transforms/Utils/ValueMapper.cpp
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@ -14,6 +14,7 @@
#include "ValueMapper.h"
#include "llvm/Type.h"
#include "llvm/GlobalAlias.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/Metadata.h"
@ -29,15 +30,35 @@ Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM) {
// Global values and non-function-local metadata do not need to be seeded into
// the VM if they are using the identity mapping.
if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MDString>(V) ||
(isa<MDNode>(V) && !cast<MDNode>(V)->isFunctionLocal()))
if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MDString>(V))
return VMSlot = const_cast<Value*>(V);
if (const MDNode *MD = dyn_cast<MDNode>(V)) {
SmallVector<Value*, 4> Elts;
for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i)
Elts.push_back(MD->getOperand(i) ? MapValue(MD->getOperand(i), VM) : 0);
return VM[V] = MDNode::get(V->getContext(), Elts.data(), Elts.size());
Value *Dummy = new GlobalAlias(V->getType(), GlobalValue::ExternalLinkage);
VMSlot = Dummy;
for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i) {
Value *OP = MD->getOperand(i);
if (!OP) continue;
Value *MV = MapValue(OP, VM);
if (MV != OP) {
// This MDNode contain a reference to mapped value. Make a new
// MDNode and return it.
SmallVector<Value*, 4> Elts;
Elts.reserve(MD->getNumOperands());
for (unsigned j = 0; j != i; ++j)
Elts.push_back(MD->getOperand(j));
Elts.push_back(MV);
for (++i; i != e; ++i)
Elts.push_back(MD->getOperand(i) ?
MapValue(MD->getOperand(i), VM) : 0);
MDNode *NewMD = MDNode::get(V->getContext(), Elts.data(), Elts.size());
Dummy->uncheckedReplaceAllUsesWith(NewMD);
delete Dummy;
return VM[V] = NewMD;
}
}
delete Dummy;
return VM[V] = const_cast<Value*>(V);
}
Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V));