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Implement: isLosslesslyConvertableTo and new CompositeType base class

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llvm-svn: 1347
This commit is contained in:
Chris Lattner 2001-11-26 17:01:47 +00:00
parent 1e270e0e2b
commit da7f31493c
1 changed files with 53 additions and 2 deletions
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55
lib/VMCore/Type.cpp
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@ -67,6 +67,57 @@ const Type *Type::getPrimitiveType(PrimitiveID IDNumber) {
}
}
// isLosslesslyConvertableTo - Return true if this type can be converted to
// 'Ty' without any reinterpretation of bits. For example, uint to int.
//
bool Type::isLosslesslyConvertableTo(const Type *Ty) const {
if (this == Ty) return true;
if ((!isPrimitiveType() && !Ty->isPointerType()) ||
(!isPointerType() && !Ty->isPrimitiveType())) return false;
if (getPrimitiveID() == Ty->getPrimitiveID())
return true; // Handles identity cast, and cast of differing pointer types
// Now we know that they are two differing primitive or pointer types
switch (getPrimitiveID()) {
case Type::UByteTyID: return Ty == Type::SByteTy;
case Type::SByteTyID: return Ty == Type::UByteTy;
case Type::UShortTyID: return Ty == Type::ShortTy;
case Type::ShortTyID: return Ty == Type::UShortTy;
case Type::UIntTyID: return Ty == Type::IntTy;
case Type::IntTyID: return Ty == Type::UIntTy;
case Type::ULongTyID:
case Type::LongTyID:
case Type::PointerTyID:
return Ty == Type::ULongTy || Ty == Type::LongTy ||
Ty->getPrimitiveID() == Type::PointerTyID;
default:
return false; // Other types have no identity values
}
}
bool StructType::indexValid(const Value *V) const {
if (!isa<ConstPoolVal>(V)) return false;
if (V->getType() != Type::UByteTy) return false;
unsigned Idx = cast<ConstPoolUInt>(V)->getValue();
return Idx < ETypes.size();
}
// getTypeAtIndex - Given an index value into the type, return the type of the
// element. For a structure type, this must be a constant value...
//
const Type *StructType::getTypeAtIndex(const Value *V) const {
assert(isa<ConstPoolVal>(V) && "Structure index must be a constant!!");
assert(V->getType() == Type::UByteTy && "Structure index must be ubyte!");
unsigned Idx = cast<ConstPoolUInt>(V)->getValue();
assert(Idx < ETypes.size() && "Structure index out of range!");
assert(indexValid(V) && "Invalid structure index!"); // Duplicate check
return ETypes[Idx];
}
//===----------------------------------------------------------------------===//
// Auxilliary classes
//===----------------------------------------------------------------------===//
@ -147,13 +198,13 @@ MethodType::MethodType(const Type *Result, const vector<const Type*> &Params,
}
ArrayType::ArrayType(const Type *ElType, int NumEl)
: DerivedType("", ArrayTyID), ElementType(PATypeHandle<Type>(ElType, this)) {
: CompositeType("", ArrayTyID), ElementType(PATypeHandle<Type>(ElType, this)){
NumElements = NumEl;
setDerivedTypeProperties();
}
StructType::StructType(const vector<const Type*> &Types)
: DerivedType("", StructTyID) {
: CompositeType("", StructTyID) {
ETypes.reserve(Types.size());
for (unsigned i = 0; i < Types.size(); ++i) {
assert(Types[i] != Type::VoidTy && "Void type in method prototype!!");