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Add method MipsTargetLowering::writeVarArgRegs which copies argument registers

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of vararg functions back to the stack.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166844 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2012-10-27 00:21:13 +00:00
parent db40edeb11
commit f084847373
2 changed files with 51 additions and 0 deletions
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45
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -4076,3 +4076,48 @@ passByValArg(SDValue Chain, DebugLoc DL,
MachinePointerInfo(0), MachinePointerInfo(0));
MemOpChains.push_back(Chain);
}
void
MipsTargetLowering::writeVarArgRegs(std::vector<SDValue> &OutChains,
const MipsCC &CC, SDValue Chain,
DebugLoc DL, SelectionDAG &DAG) const {
unsigned NumRegs = CC.numIntArgRegs();
const uint16_t *ArgRegs = CC.intArgRegs();
const CCState &CCInfo = CC.getCCInfo();
unsigned Idx = CCInfo.getFirstUnallocated(ArgRegs, NumRegs);
unsigned RegSize = CC.regSize();
EVT RegTy = MVT::getIntegerVT(RegSize * 8);
const TargetRegisterClass *RC = getRegClassFor(RegTy);
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
// Offset of the first variable argument from stack pointer.
int VaArgOffset;
if (NumRegs == Idx)
VaArgOffset = RoundUpToAlignment(CCInfo.getNextStackOffset(), RegSize);
else
VaArgOffset =
(int)CC.reservedArgArea() - (int)(RegSize * (NumRegs - Idx));
// Record the frame index of the first variable argument
// which is a value necessary to VASTART.
int FI = MFI->CreateFixedObject(RegSize, VaArgOffset, true);
MipsFI->setVarArgsFrameIndex(FI);
// Copy the integer registers that have not been used for argument passing
// to the argument register save area. For O32, the save area is allocated
// in the caller's stack frame, while for N32/64, it is allocated in the
// callee's stack frame.
for (unsigned I = Idx; I < NumRegs; ++I, VaArgOffset += RegSize) {
unsigned Reg = AddLiveIn(MF, ArgRegs[I], RC);
SDValue ArgValue = DAG.getCopyFromReg(Chain, DL, Reg, RegTy);
FI = MFI->CreateFixedObject(RegSize, VaArgOffset, true);
SDValue PtrOff = DAG.getFrameIndex(FI, getPointerTy());
SDValue Store = DAG.getStore(Chain, DL, ArgValue, PtrOff,
MachinePointerInfo(), false, false, 0);
cast<StoreSDNode>(Store.getNode())->getMemOperand()->setValue(0);
OutChains.push_back(Store);
}
}

6
lib/Target/Mips/MipsISelLowering.h
View File

@ -295,6 +295,12 @@ namespace llvm {
const MipsCC &CC, const ByValArgInfo &ByVal,
const ISD::ArgFlagsTy &Flags, bool isLittle) const;
/// writeVarArgRegs - Write variable function arguments passed in registers
/// to the stack. Also create a stack frame object for the first variable
/// argument.
void writeVarArgRegs(std::vector<SDValue> &OutChains, const MipsCC &CC,
SDValue Chain, DebugLoc DL, SelectionDAG &DAG) const;
virtual SDValue
LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,