replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Implement MipsABIInfo::EmitVAArg. This fix enables clang to complete compilation 

without bailing out when va_arg is an aggregate expression. However, 
alignment checking needs to be added in isSafeToEliminateVarargsCast in
InstCombineCalls.cpp in order to produce correct mips code (see link below).

http://lists.cs.uiuc.edu/pipermail/llvmdev/2011-July/042047.html

llvm-svn: 136647
This commit is contained in:
Akira Hatanaka 2011-08-01 20:48:01 +00:00
parent 2fbb48ae20
commit fb1d9f325c
1 changed files with 31 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
clang/lib/CodeGen/TargetInfo.cpp
View File

@ -2904,6 +2904,7 @@ void MSP430TargetCodeGenInfo::SetTargetAttributes(const Decl *D,
namespace {
class MipsABIInfo : public ABIInfo {
static const unsigned MinABIStackAlignInBytes = 4;
public:
MipsABIInfo(CodeGenTypes &CGT) : ABIInfo(CGT) {}
@ -2978,7 +2979,36 @@ void MipsABIInfo::computeInfo(CGFunctionInfo &FI) const {
llvm::Value* MipsABIInfo::EmitVAArg(llvm::Value *VAListAddr, QualType Ty,
CodeGenFunction &CGF) const {
return 0;
llvm::Type *BP = llvm::Type::getInt8PtrTy(CGF.getLLVMContext());
llvm::Type *BPP = llvm::PointerType::getUnqual(BP);
CGBuilderTy &Builder = CGF.Builder;
llvm::Value *VAListAddrAsBPP = Builder.CreateBitCast(VAListAddr, BPP, "ap");
llvm::Value *Addr = Builder.CreateLoad(VAListAddrAsBPP, "ap.cur");
unsigned TypeAlign = getContext().getTypeAlign(Ty) / 8;
llvm::Type *PTy = llvm::PointerType::getUnqual(CGF.ConvertType(Ty));
llvm::Value *AddrTyped;
if (TypeAlign > MinABIStackAlignInBytes) {
llvm::Value *AddrAsInt32 = CGF.Builder.CreatePtrToInt(Addr, CGF.Int32Ty);
llvm::Value *Inc = llvm::ConstantInt::get(CGF.Int32Ty, TypeAlign - 1);
llvm::Value *Mask = llvm::ConstantInt::get(CGF.Int32Ty, -TypeAlign);
llvm::Value *Add = CGF.Builder.CreateAdd(AddrAsInt32, Inc);
llvm::Value *And = CGF.Builder.CreateAnd(Add, Mask);
AddrTyped = CGF.Builder.CreateIntToPtr(And, PTy);
}
else
AddrTyped = Builder.CreateBitCast(Addr, PTy);
llvm::Value *AlignedAddr = Builder.CreateBitCast(AddrTyped, BP);
uint64_t Offset =
llvm::RoundUpToAlignment(CGF.getContext().getTypeSize(Ty) / 8, TypeAlign);
llvm::Value *NextAddr =
Builder.CreateGEP(AlignedAddr, llvm::ConstantInt::get(CGF.Int32Ty, Offset),
"ap.next");
Builder.CreateStore(NextAddr, VAListAddrAsBPP);
return AddrTyped;
}
bool