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replaceUsesOfWithOnConstant implementation for unions.

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llvm-svn: 96616
This commit is contained in:
Talin 2010-02-18 21:43:45 +00:00
parent f0d7b5df4b
commit cd8428c41f
1 changed files with 46 additions and 1 deletions
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47
lib/VMCore/Constants.cpp
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@ -2113,7 +2113,52 @@ void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
void ConstantUnion::replaceUsesOfWithOnConstant(Value *From, Value *To,
Use *U) {
assert(false && "Implement replaceUsesOfWithOnConstant for unions");
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
Constant *ToC = cast<Constant>(To);
assert(U == OperandList && "Union constants can only have one use!");
assert(getNumOperands() == 1 && "Union constants can only have one use!");
assert(getOperand(0) == From && "ReplaceAllUsesWith broken!");
std::pair<LLVMContextImpl::UnionConstantsTy::MapKey, ConstantUnion*> Lookup;
Lookup.first.first = getType();
Lookup.second = this;
Lookup.first.second = ToC;
LLVMContext &Context = getType()->getContext();
LLVMContextImpl *pImpl = Context.pImpl;
Constant *Replacement = 0;
if (ToC->isNullValue()) {
Replacement = ConstantAggregateZero::get(getType());
} else {
// Check to see if we have this union type already.
bool Exists;
LLVMContextImpl::UnionConstantsTy::MapTy::iterator I =
pImpl->UnionConstants.InsertOrGetItem(Lookup, Exists);
if (Exists) {
Replacement = I->second;
} else {
// Okay, the new shape doesn't exist in the system yet. Instead of
// creating a new constant union, inserting it, replaceallusesof'ing the
// old with the new, then deleting the old... just update the current one
// in place!
pImpl->UnionConstants.MoveConstantToNewSlot(this, I);
// Update to the new value.
setOperand(0, ToC);
return;
}
}
assert(Replacement != this && "I didn't contain From!");
// Everyone using this now uses the replacement.
uncheckedReplaceAllUsesWith(Replacement);
// Delete the old constant!
destroyConstant();
}
void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,