void MipsFrameInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front();
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
const MipsRegisterInfo *RegInfo =
static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
const MipsInstrInfo &TII =
*static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
MachineBasicBlock::iterator MBBI = MBB.begin();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
bool isPIC = (MF.getTarget().getRelocationModel() == Reloc::PIC_);
// Get the right frame order for Mips.
adjustMipsStackFrame(MF);
// Get the number of bytes to allocate from the FrameInfo.
unsigned StackSize = MFI->getStackSize();
// No need to allocate space on the stack.
if (StackSize == 0 && !MFI->adjustsStack()) return;
int FPOffset = MipsFI->getFPStackOffset();
int RAOffset = MipsFI->getRAStackOffset();
BuildMI(MBB, MBBI, dl, TII.get(Mips::NOREORDER));
// TODO: check need from GP here.
if (isPIC && STI.isABI_O32())
BuildMI(MBB, MBBI, dl, TII.get(Mips::CPLOAD))
.addReg(RegInfo->getPICCallReg());
BuildMI(MBB, MBBI, dl, TII.get(Mips::NOMACRO));
// Adjust stack : addi sp, sp, (-imm)
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDiu), Mips::SP)
.addReg(Mips::SP).addImm(-StackSize);
// Save the return address only if the function isnt a leaf one.
// sw $ra, stack_loc($sp)
if (MFI->adjustsStack()) {
BuildMI(MBB, MBBI, dl, TII.get(Mips::SW))
.addReg(Mips::RA).addImm(RAOffset).addReg(Mips::SP);
}
// if framepointer enabled, save it and set it
// to point to the stack pointer
if (hasFP(MF)) {
// sw $fp,stack_loc($sp)
BuildMI(MBB, MBBI, dl, TII.get(Mips::SW))
.addReg(Mips::FP).addImm(FPOffset).addReg(Mips::SP);
// move $fp, $sp
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDu), Mips::FP)
.addReg(Mips::SP).addReg(Mips::ZERO);
}
// Restore GP from the saved stack location
if (MipsFI->needGPSaveRestore())
BuildMI(MBB, MBBI, dl, TII.get(Mips::CPRESTORE))
.addImm(MipsFI->getGPStackOffset());
}
void MipsFrameInfo::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = prior(MBB.end());
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
const MipsInstrInfo &TII =
*static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
DebugLoc dl = MBBI->getDebugLoc();
// Get the number of bytes from FrameInfo
int NumBytes = (int) MFI->getStackSize();
// Get the FI's where RA and FP are saved.
int FPOffset = MipsFI->getFPStackOffset();
int RAOffset = MipsFI->getRAStackOffset();
// if framepointer enabled, restore it and restore the
// stack pointer
if (hasFP(MF)) {
// move $sp, $fp
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDu), Mips::SP)
.addReg(Mips::FP).addReg(Mips::ZERO);
// lw $fp,stack_loc($sp)
BuildMI(MBB, MBBI, dl, TII.get(Mips::LW), Mips::FP)
.addImm(FPOffset).addReg(Mips::SP);
}
// Restore the return address only if the function isnt a leaf one.
// lw $ra, stack_loc($sp)
if (MFI->adjustsStack()) {
BuildMI(MBB, MBBI, dl, TII.get(Mips::LW), Mips::RA)
.addImm(RAOffset).addReg(Mips::SP);
}
// adjust stack : insert addi sp, sp, (imm)
if (NumBytes) {
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDiu), Mips::SP)
.addReg(Mips::SP).addImm(NumBytes);
}
}
void MipsFrameLowering::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
const MipsInstrInfo &TII =
*static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
DebugLoc dl = MBBI->getDebugLoc();
// Get the number of bytes from FrameInfo
int NumBytes = (int) MFI->getStackSize();
// Get the FI's where RA and FP are saved.
int FPOffset = MipsFI->getFPStackOffset();
int RAOffset = MipsFI->getRAStackOffset();
unsigned NewReg = 0;
int NewImm = 0;
bool ATUsed = false;
// if framepointer enabled, restore it and restore the
// stack pointer
if (hasFP(MF)) {
// move $sp, $fp
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDu), Mips::SP)
.addReg(Mips::FP).addReg(Mips::ZERO);
// lw $fp,stack_loc($sp)
ATUsed = expandRegLargeImmPair(Mips::SP, FPOffset, NewReg, NewImm, MBB,
MBBI);
BuildMI(MBB, MBBI, dl, TII.get(Mips::LW), Mips::FP)
.addImm(NewImm).addReg(NewReg);
// FIXME: change this when mips goes MC".
if (ATUsed)
BuildMI(MBB, MBBI, dl, TII.get(Mips::ATMACRO));
}
// Restore the return address only if the function isnt a leaf one.
// lw $ra, stack_loc($sp)
if (MFI->adjustsStack()) {
expandRegLargeImmPair(Mips::SP, RAOffset, NewReg, NewImm, MBB, MBBI);
BuildMI(MBB, MBBI, dl, TII.get(Mips::LW), Mips::RA)
.addImm(NewImm).addReg(NewReg);
// FIXME: change this when mips goes MC".
if (ATUsed)
BuildMI(MBB, MBBI, dl, TII.get(Mips::ATMACRO));
}
// adjust stack : insert addi sp, sp, (imm)
if (NumBytes) {
expandRegLargeImmPair(Mips::SP, NumBytes, NewReg, NewImm, MBB, MBBI);
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDiu), Mips::SP)
.addReg(NewReg).addImm(NewImm);
// FIXME: change this when mips goes MC".
if (ATUsed)
BuildMI(MBB, MBBI, dl, TII.get(Mips::ATMACRO));
}
}
