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Do not rely on DenseMap slot which can be easily invalidated when DenseMap grows.

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llvm-svn: 106528
This commit is contained in:
Devang Patel 2010-06-22 05:16:56 +00:00
parent 714eba185c
commit d5696fa05b
1 changed files with 5 additions and 7 deletions
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12
lib/Transforms/Utils/ValueMapper.cpp
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@ -21,17 +21,15 @@
using namespace llvm;
Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM) {
Value *&VMSlot = VM[V];
if (VMSlot) return VMSlot; // Does it exist in the map yet?
ValueToValueMapTy::iterator VMI = VM.find(V);
if (VMI != VM.end())
return VMI->second;
// NOTE: VMSlot can be invalidated by any reference to VM, which can grow the
// DenseMap. This includes any recursive calls to MapValue.
// Global values and non-function-local 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<MDString>(V) ||
(isa<MDNode>(V) && !cast<MDNode>(V)->isFunctionLocal()))
return VMSlot = const_cast<Value*>(V);
return VM[V] = const_cast<Value*>(V);
if (const MDNode *MD = dyn_cast<MDNode>(V)) {
SmallVector<Value*, 4> Elts;
@ -46,7 +44,7 @@ Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM) {
if (isa<ConstantInt>(C) || isa<ConstantFP>(C) ||
isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C) ||
isa<UndefValue>(C) || isa<MDString>(C))
return VMSlot = C; // Primitive constants map directly
return VM[V] = C; // Primitive constants map directly
if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
for (User::op_iterator b = CA->op_begin(), i = b, e = CA->op_end();