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implement rudimentary union layout support. 

llvm-svn: 41421
This commit is contained in:
Chris Lattner 2007-08-26 04:50:19 +00:00
parent 5e75e8bc71
commit 57c269b5d3
1 changed files with 31 additions and 8 deletions
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39
clang/CodeGen/CodeGenTypes.cpp
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@ -143,15 +143,38 @@ const llvm::Type *CodeGenTypes::ConvertType(QualType T) {
if (!TD->isDefinition()) {
ResultType = llvm::OpaqueType::get();
} else if (TD->getKind() == Decl::Struct) {
const RecordDecl *RD = cast<const RecordDecl>(TD);
std::vector<const llvm::Type*> Fields;
for (unsigned i = 0, e = RD->getNumMembers(); i != e; ++i)
Fields.push_back(ConvertType(RD->getMember(i)->getType()));
ResultType = llvm::StructType::get(Fields);
} else if (TD->getKind() == Decl::Union) {
const RecordDecl *RD = cast<const RecordDecl>(TD);
// Just use the largest element of the union, breaking ties with the
// highest aligned member.
std::vector<const llvm::Type*> Fields;
if (RD->getNumMembers() != 0) {
std::pair<uint64_t, unsigned> MaxElt =
Context.getTypeInfo(RD->getMember(0)->getType(), SourceLocation());
unsigned MaxEltNo = 0;
for (unsigned i = 1, e = RD->getNumMembers(); i != e; ++i) {
std::pair<uint64_t, unsigned> EltInfo =
Context.getTypeInfo(RD->getMember(i)->getType(), SourceLocation());
if (EltInfo.first > MaxElt.first ||
(EltInfo.first == MaxElt.first &&
EltInfo.second > MaxElt.second)) {
MaxElt = EltInfo;
MaxEltNo = i;
}
}
Fields.push_back(ConvertType(RD->getMember(MaxEltNo)->getType()));
}
ResultType = llvm::StructType::get(Fields);
} else {
if (TD->getKind() == Decl::Struct) {
const RecordDecl *RD = cast<const RecordDecl>(TD);
std::vector<const llvm::Type*> Fields;
for (unsigned i = 0, e = RD->getNumMembers(); i != e; ++i)
Fields.push_back(ConvertType(RD->getMember(i)->getType()));
ResultType = llvm::StructType::get(Fields);
} else
assert(0 && "FIXME: Implement tag decl kind!");
assert(0 && "FIXME: Implement tag decl kind!");
}
std::string TypeName(TD->getKindName());