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reapply r98656 unmodified, which exposed the asmprinter not

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handling constant unions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98680 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-03-16 21:25:55 +00:00
parent 2b0272e43d
commit 93b122d3c4
5 changed files with 73 additions and 4 deletions
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25
lib/Target/TargetData.cpp
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@ -460,6 +460,15 @@ uint64_t TargetData::getTypeSizeInBits(const Type *Ty) const {
case Type::StructTyID:
// Get the layout annotation... which is lazily created on demand.
return getStructLayout(cast<StructType>(Ty))->getSizeInBits();
case Type::UnionTyID: {
const UnionType *UnTy = cast<UnionType>(Ty);
uint64_t Size = 0;
for (UnionType::element_iterator i = UnTy->element_begin(),
e = UnTy->element_end(); i != e; ++i) {
Size = std::max(Size, getTypeSizeInBits(*i));
}
return Size;
}
case Type::IntegerTyID:
return cast<IntegerType>(Ty)->getBitWidth();
case Type::VoidTyID:
@ -516,6 +525,17 @@ unsigned char TargetData::getAlignment(const Type *Ty, bool abi_or_pref) const {
unsigned Align = getAlignmentInfo(AGGREGATE_ALIGN, 0, abi_or_pref, Ty);
return std::max(Align, (unsigned)Layout->getAlignment());
}
case Type::UnionTyID: {
const UnionType *UnTy = cast<UnionType>(Ty);
unsigned Align = 1;
// Unions need the maximum alignment of all their entries
for (UnionType::element_iterator i = UnTy->element_begin(),
e = UnTy->element_end(); i != e; ++i) {
Align = std::max(Align, (unsigned)getAlignment(*i, abi_or_pref));
}
return Align;
}
case Type::IntegerTyID:
case Type::VoidTyID:
AlignType = INTEGER_ALIGN;
@ -600,6 +620,11 @@ uint64_t TargetData::getIndexedOffset(const Type *ptrTy, Value* const* Indices,
// Update Ty to refer to current element
Ty = STy->getElementType(FieldNo);
} else if (const UnionType *UnTy = dyn_cast<UnionType>(*TI)) {
unsigned FieldNo = cast<ConstantInt>(Indices[CurIDX])->getZExtValue();
// Offset into union is canonically 0, but type changes
Ty = UnTy->getElementType(FieldNo);
} else {
// Update Ty to refer to current element
Ty = cast<SequentialType>(Ty)->getElementType();