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Add ConstantExpr::getSizeOf(Type*).

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llvm-svn: 17196
This commit is contained in:
Alkis Evlogimenos 2004-10-24 01:41:10 +00:00
parent f8bd6fc901
commit a893aad8fb
2 changed files with 13 additions and 0 deletions
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4
include/llvm/Constants.h
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@ -557,6 +557,10 @@ public:
return getSelectTy(V1->getType(), C, V1, V2); return getSelectTy(V1->getType(), C, V1, V2);
} }
/// getSizeOf constant expr - computes the size of a type in a
/// target independent way
///
static Constant *getSizeOf(const Type *Ty);
/// ConstantExpr::get - Return a binary or shift operator constant expression, /// ConstantExpr::get - Return a binary or shift operator constant expression,
/// folding if possible. /// folding if possible.

9
lib/VMCore/Constants.cpp
View File

@ -1244,6 +1244,15 @@ Constant *ConstantExpr::getZeroExtend(Constant *C, const Type *Ty) {
return ConstantExpr::getCast(C, Ty); return ConstantExpr::getCast(C, Ty);
} }
Constant *ConstantExpr::getSizeOf(const Type *Ty) {
// sizeof is implemented as: (unsigned) gep (Ty)null, 1
return getCast(
getGetElementPtr(
getNullValue(Ty),
std::vector<Constant*>(1, ConstantInt::get(Type::UByteTy, 1))),
Type::UIntTy);
}
Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode, Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
Constant *C1, Constant *C2) { Constant *C1, Constant *C2) {
if (Opcode == Instruction::Shl || Opcode == Instruction::Shr) if (Opcode == Instruction::Shl || Opcode == Instruction::Shr)