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Implement UndefValue class

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17040 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-16 18:07:16 +00:00
parent c8717b1624
commit b9f18592a6
1 changed files with 45 additions and 0 deletions
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45
lib/VMCore/Constants.cpp
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@ -1098,6 +1098,51 @@ void ConstantPointerNull::destroyConstant() {
}
//---- UndefValue::get() implementation...
//
namespace llvm {
// UndefValue does not take extra "value" argument...
template<class ValType>
struct ConstantCreator<UndefValue, Type, ValType> {
static UndefValue *create(const Type *Ty, const ValType &V) {
return new UndefValue(Ty);
}
};
template<>
struct ConvertConstantType<UndefValue, Type> {
static void convert(UndefValue *OldC, const Type *NewTy) {
// Make everyone now use a constant of the new type.
Constant *New = UndefValue::get(NewTy);
assert(New != OldC && "Didn't replace constant??");
OldC->uncheckedReplaceAllUsesWith(New);
OldC->destroyConstant(); // This constant is now dead, destroy it.
}
};
}
static ValueMap<char, Type, UndefValue> UndefValueConstants;
static char getValType(UndefValue *) {
return 0;
}
UndefValue *UndefValue::get(const Type *Ty) {
return UndefValueConstants.getOrCreate(Ty, 0);
}
// destroyConstant - Remove the constant from the constant table.
//
void UndefValue::destroyConstant() {
UndefValueConstants.remove(this);
destroyConstantImpl();
}
//---- ConstantExpr::get() implementations...
//
typedef std::pair<unsigned, std::vector<Constant*> > ExprMapKeyType;