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Extend TargetData::getIndexedOffset to support arrays and pointers!

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llvm-svn: 2535
This commit is contained in:
Chris Lattner 2002-05-07 20:00:33 +00:00
parent 5b99f25879
commit c038503630
1 changed files with 13 additions and 10 deletions
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23
lib/Target/TargetData.cpp
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@ -145,16 +145,12 @@ unsigned char TargetData::getTypeAlignment(const Type *Ty) const {
return Align;
}
unsigned TargetData::getIndexedOffset(const Type *ptrTy,
unsigned TargetData::getIndexedOffset(const Type *Ty,
const std::vector<Value*> &Idx) const {
const PointerType *PtrTy = cast<const PointerType>(ptrTy);
unsigned Result = 0;
// Get the type pointed to...
const Type *Ty = PtrTy->getElementType();
for (unsigned CurIDX = 0; CurIDX < Idx.size(); ++CurIDX) {
if (const StructType *STy = dyn_cast<const StructType>(Ty)) {
for (unsigned CurIDX = 0, E = Idx.size(); CurIDX != E; ++CurIDX) {
if (const StructType *STy = dyn_cast<StructType>(Ty)) {
assert(Idx[CurIDX]->getType() == Type::UByteTy && "Illegal struct idx");
unsigned FieldNo = cast<ConstantUInt>(Idx[CurIDX])->getValue();
@ -168,10 +164,17 @@ unsigned TargetData::getIndexedOffset(const Type *ptrTy,
// Update Ty to refer to current element
Ty = STy->getElementTypes()[FieldNo];
} else if (isa<const ArrayType>(Ty)) {
assert(0 && "Loading from arrays not implemented yet!");
} else if (const SequentialType *STy = dyn_cast<SequentialType>(Ty)) {
assert(Idx[CurIDX]->getType() == Type::UIntTy &&"Illegal sequential idx");
assert(isa<ConstantUInt>(Idx[CurIDX]) &&
"getIndexedOffset cannot compute offset of non-constant index!");
unsigned IndexNo = cast<ConstantUInt>(Idx[CurIDX])->getValue();
Ty = STy->getElementType();
Result += IndexNo*getTypeSize(Ty);
} else {
assert(0 && "Indexing type that is not struct or array?");
assert(0 && "Indexing type that is not struct, array, or pointer?");
return 0; // Load directly through ptr
}
}