本文整理汇总了C++中MipsFunctionInfo::setRAStackOffset方法的典型用法代码示例。如果您正苦于以下问题：C++ MipsFunctionInfo::setRAStackOffset方法的具体用法？C++ MipsFunctionInfo::setRAStackOffset怎么用？C++ MipsFunctionInfo::setRAStackOffset使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类MipsFunctionInfo的用法示例。
在下文中一共展示了MipsFunctionInfo::setRAStackOffset方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: adjustMipsStackFrame
void MipsFrameLowering::adjustMipsStackFrame(MachineFunction &MF) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
unsigned StackAlign = getStackAlignment();
unsigned RegSize = STI.isGP32bit() ? 4 : 8;
bool HasGP = MipsFI->needGPSaveRestore();
// Min and Max CSI FrameIndex.
int MinCSFI = -1, MaxCSFI = -1;
// See the description at MipsMachineFunction.h
int TopCPUSavedRegOff = -1, TopFPUSavedRegOff = -1;
// Replace the dummy '0' SPOffset by the negative offsets, as explained on
// LowerFormalArguments. Leaving '0' for while is necessary to avoid the
// approach done by calculateFrameObjectOffsets to the stack frame.
MipsFI->adjustLoadArgsFI(MFI);
MipsFI->adjustStoreVarArgsFI(MFI);
// It happens that the default stack frame allocation order does not directly
// map to the convention used for mips. So we must fix it. We move the callee
// save register slots after the local variables area, as described in the
// stack frame above.
unsigned CalleeSavedAreaSize = 0;
if (!CSI.empty()) {
MinCSFI = CSI[0].getFrameIdx();
MaxCSFI = CSI[CSI.size()-1].getFrameIdx();
}
for (unsigned i = 0, e = CSI.size(); i != e; ++i)
CalleeSavedAreaSize += MFI->getObjectAlignment(CSI[i].getFrameIdx());
unsigned StackOffset = HasGP ? (MipsFI->getGPStackOffset()+RegSize)
: (STI.isABI_O32() ? 16 : 0);
// Adjust local variables. They should come on the stack right
// after the arguments.
int LastOffsetFI = -1;
for (int i = 0, e = MFI->getObjectIndexEnd(); i != e; ++i) {
if (i >= MinCSFI && i <= MaxCSFI)
continue;
if (MFI->isDeadObjectIndex(i))
continue;
unsigned Offset =
StackOffset + MFI->getObjectOffset(i) - CalleeSavedAreaSize;
if (LastOffsetFI == -1)
LastOffsetFI = i;
if (Offset > MFI->getObjectOffset(LastOffsetFI))
LastOffsetFI = i;
MFI->setObjectOffset(i, Offset);
}
// Adjust CPU Callee Saved Registers Area. Registers RA and FP must
// be saved in this CPU Area. This whole area must be aligned to the
// default Stack Alignment requirements.
if (LastOffsetFI >= 0)
StackOffset = MFI->getObjectOffset(LastOffsetFI)+
MFI->getObjectSize(LastOffsetFI);
StackOffset = ((StackOffset+StackAlign-1)/StackAlign*StackAlign);
for (unsigned i = 0, e = CSI.size(); i != e ; ++i) {
unsigned Reg = CSI[i].getReg();
if (!Mips::CPURegsRegisterClass->contains(Reg))
break;
MFI->setObjectOffset(CSI[i].getFrameIdx(), StackOffset);
TopCPUSavedRegOff = StackOffset;
StackOffset += MFI->getObjectAlignment(CSI[i].getFrameIdx());
}
// Stack locations for FP and RA. If only one of them is used,
// the space must be allocated for both, otherwise no space at all.
if (hasFP(MF) || MFI->adjustsStack()) {
// FP stack location
MFI->setObjectOffset(MFI->CreateStackObject(RegSize, RegSize, true),
StackOffset);
MipsFI->setFPStackOffset(StackOffset);
TopCPUSavedRegOff = StackOffset;
StackOffset += RegSize;
// SP stack location
MFI->setObjectOffset(MFI->CreateStackObject(RegSize, RegSize, true),
StackOffset);
MipsFI->setRAStackOffset(StackOffset);
StackOffset += RegSize;
if (MFI->adjustsStack())
TopCPUSavedRegOff += RegSize;
}
StackOffset = ((StackOffset+StackAlign-1)/StackAlign*StackAlign);
// Adjust FPU Callee Saved Registers Area. This Area must be
// aligned to the default Stack Alignment requirements.
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
unsigned Reg = CSI[i].getReg();
if (Mips::CPURegsRegisterClass->contains(Reg))
continue;
MFI->setObjectOffset(CSI[i].getFrameIdx(), StackOffset);
TopFPUSavedRegOff = StackOffset;
StackOffset += MFI->getObjectAlignment(CSI[i].getFrameIdx());
//.........这里部分代码省略.........