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Do not seed mstadata into the value map.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77208 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2009-07-27 17:17:04 +00:00
parent 40412e7e90
commit 41d89c2572
1 changed files with 4 additions and 25 deletions
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29
lib/Transforms/Utils/ValueMapper.cpp
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@ -14,6 +14,7 @@
#include "llvm/Transforms/Utils/ValueMapper.h"
#include "llvm/BasicBlock.h"
#include "llvm/DerivedTypes.h" // For getNullValue(Type::Int32Ty)
#include "llvm/Constants.h"
#include "llvm/GlobalValue.h"
#include "llvm/Instruction.h"
@ -30,9 +31,9 @@ Value *llvm::MapValue(const Value *V, ValueMapTy &VM, LLVMContext &Context) {
// NOTE: VMSlot can be invalidated by any reference to VM, which can grow the
// DenseMap. This includes any recursive calls to MapValue.
// Global values do not need to be seeded into the ValueMap if they are using
// the identity mapping.
if (isa<GlobalValue>(V) || isa<InlineAsm>(V))
// Global values and metadata do not need to be seeded into the ValueMap if
// they are using the identity mapping.
if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MetadataBase>(V))
return VMSlot = const_cast<Value*>(V);
if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
@ -105,32 +106,10 @@ Value *llvm::MapValue(const Value *V, ValueMapTy &VM, LLVMContext &Context) {
}
return VM[V] = C;
} else if (MDNode *N = dyn_cast<MDNode>(C)) {
for (MDNode::const_elem_iterator b = N->elem_begin(), i = b,
e = N->elem_end(); i != e; ++i) {
if (!*i) continue;
Value *MV = MapValue(*i, VM, Context);
if (MV != *i) {
// This MDNode must contain a reference to a global, make a new MDNode
// and return it.
SmallVector<Value*, 8> Values;
Values.reserve(N->getNumElements());
for (MDNode::const_elem_iterator j = b; j != i; ++j)
Values.push_back(*j);
Values.push_back(MV);
for (++i; i != e; ++i)
Values.push_back(MapValue(*i, VM, Context));
return VM[V] = Context.getMDNode(Values.data(), Values.size());
}
}
return VM[V] = C;
} else {
llvm_unreachable("Unknown type of constant!");
}
}
return 0;
}