return false;
}
-int
-X86RegisterInfo::getFrameIndexOffset(const MachineFunction &MF, int FI) const {
- const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo();
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- int Offset = MFI->getObjectOffset(FI) - TFI->getOffsetOfLocalArea();
- uint64_t StackSize = MFI->getStackSize();
-
- if (needsStackRealignment(MF)) {
- if (FI < 0) {
- // Skip the saved EBP.
- Offset += SlotSize;
- } else {
- unsigned Align = MFI->getObjectAlignment(FI);
- assert((-(Offset + StackSize)) % Align == 0);
- Align = 0;
- return Offset + StackSize;
- }
- // FIXME: Support tail calls
- } else {
- if (!TFI->hasFP(MF))
- return Offset + StackSize;
-
- // Skip the saved EBP.
- Offset += SlotSize;
-
- // Skip the RETADDR move area
- const X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
- int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
- if (TailCallReturnAddrDelta < 0)
- Offset -= TailCallReturnAddrDelta;
- }
-
- return Offset;
-}
-
static unsigned getSUBriOpcode(unsigned is64Bit, int64_t Imm) {
if (is64Bit) {
if (isInt<8>(Imm))
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo();
-
- if (!TFI->hasReservedCallFrame(MF)) {
+ bool reseveCallFrame = TFI->hasReservedCallFrame(MF);
+ int Opcode = I->getOpcode();
+ bool isDestroy = Opcode == getCallFrameDestroyOpcode();
+ DebugLoc DL = I->getDebugLoc();
+ uint64_t Amount = !reseveCallFrame ? I->getOperand(0).getImm() : 0;
+ uint64_t CalleeAmt = isDestroy ? I->getOperand(1).getImm() : 0;
+ I = MBB.erase(I);
+
+ if (!reseveCallFrame) {
// If the stack pointer can be changed after prologue, turn the
// adjcallstackup instruction into a 'sub ESP, <amt>' and the
// adjcallstackdown instruction into 'add ESP, <amt>'
// TODO: consider using push / pop instead of sub + store / add
- MachineInstr *Old = I;
- uint64_t Amount = Old->getOperand(0).getImm();
- if (Amount != 0) {
- // We need to keep the stack aligned properly. To do this, we round the
- // amount of space needed for the outgoing arguments up to the next
- // alignment boundary.
- Amount = (Amount + StackAlign - 1) / StackAlign * StackAlign;
-
- MachineInstr *New = 0;
- if (Old->getOpcode() == getCallFrameSetupOpcode()) {
- New = BuildMI(MF, Old->getDebugLoc(),
- TII.get(getSUBriOpcode(Is64Bit, Amount)),
- StackPtr)
- .addReg(StackPtr)
- .addImm(Amount);
- } else {
- assert(Old->getOpcode() == getCallFrameDestroyOpcode());
-
- // Factor out the amount the callee already popped.
- uint64_t CalleeAmt = Old->getOperand(1).getImm();
- Amount -= CalleeAmt;
+ if (Amount == 0)
+ return;
+
+ // We need to keep the stack aligned properly. To do this, we round the
+ // amount of space needed for the outgoing arguments up to the next
+ // alignment boundary.
+ Amount = (Amount + StackAlign - 1) / StackAlign * StackAlign;
+
+ MachineInstr *New = 0;
+ if (Opcode == getCallFrameSetupOpcode()) {
+ New = BuildMI(MF, DL, TII.get(getSUBriOpcode(Is64Bit, Amount)),
+ StackPtr)
+ .addReg(StackPtr)
+ .addImm(Amount);
+ } else {
+ assert(Opcode == getCallFrameDestroyOpcode());
+
+ // Factor out the amount the callee already popped.
+ Amount -= CalleeAmt;
if (Amount) {
- unsigned Opc = getADDriOpcode(Is64Bit, Amount);
- New = BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), StackPtr)
- .addReg(StackPtr)
- .addImm(Amount);
- }
- }
-
- if (New) {
- // The EFLAGS implicit def is dead.
- New->getOperand(3).setIsDead();
-
- // Replace the pseudo instruction with a new instruction.
- MBB.insert(I, New);
+ unsigned Opc = getADDriOpcode(Is64Bit, Amount);
+ New = BuildMI(MF, DL, TII.get(Opc), StackPtr)
+ .addReg(StackPtr).addImm(Amount);
}
}
- } else if (I->getOpcode() == getCallFrameDestroyOpcode()) {
- // If we are performing frame pointer elimination and if the callee pops
- // something off the stack pointer, add it back. We do this until we have
- // more advanced stack pointer tracking ability.
- if (uint64_t CalleeAmt = I->getOperand(1).getImm()) {
- unsigned Opc = getSUBriOpcode(Is64Bit, CalleeAmt);
- MachineInstr *Old = I;
- MachineInstr *New =
- BuildMI(MF, Old->getDebugLoc(), TII.get(Opc),
- StackPtr)
- .addReg(StackPtr)
- .addImm(CalleeAmt);
+ if (New) {
// The EFLAGS implicit def is dead.
New->getOperand(3).setIsDead();
+
+ // Replace the pseudo instruction with a new instruction.
MBB.insert(I, New);
}
+
+ return;
}
- MBB.erase(I);
+ if (Opcode == getCallFrameDestroyOpcode() && CalleeAmt) {
+ // If we are performing frame pointer elimination and if the callee pops
+ // something off the stack pointer, add it back. We do this until we have
+ // more advanced stack pointer tracking ability.
+ unsigned Opc = getSUBriOpcode(Is64Bit, CalleeAmt);
+ MachineInstr *New = BuildMI(MF, DL, TII.get(Opc), StackPtr)
+ .addReg(StackPtr).addImm(CalleeAmt);
+
+ // The EFLAGS implicit def is dead.
+ New->getOperand(3).setIsDead();
+ MBB.insert(I, New);
+ }
}
void
const MachineFrameInfo *MFI = MF.getFrameInfo();
FIOffset = MFI->getObjectOffset(FrameIndex) - TFI->getOffsetOfLocalArea();
} else
- FIOffset = getFrameIndexOffset(MF, FrameIndex);
+ FIOffset = TFI->getFrameIndexOffset(MF, FrameIndex);
if (MI.getOperand(i+3).isImm()) {
// Offset is a 32-bit integer.
}
}
-void
-X86RegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
- RegScavenger *RS) const {
- MachineFrameInfo *MFI = MF.getFrameInfo();
- const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo();
-
- X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
- int32_t TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
-
- if (TailCallReturnAddrDelta < 0) {
- // create RETURNADDR area
- // arg
- // arg
- // RETADDR
- // { ...
- // RETADDR area
- // ...
- // }
- // [EBP]
- MFI->CreateFixedObject(-TailCallReturnAddrDelta,
- (-1U*SlotSize)+TailCallReturnAddrDelta, true);
- }
-
- if (TFI->hasFP(MF)) {
- assert((TailCallReturnAddrDelta <= 0) &&
- "The Delta should always be zero or negative");
- const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
-
- // Create a frame entry for the EBP register that must be saved.
- int FrameIdx = MFI->CreateFixedObject(SlotSize,
- -(int)SlotSize +
- TFI.getOffsetOfLocalArea() +
- TailCallReturnAddrDelta,
- true);
- assert(FrameIdx == MFI->getObjectIndexBegin() &&
- "Slot for EBP register must be last in order to be found!");
- FrameIdx = 0;
- }
-}
-
unsigned X86RegisterInfo::getRARegister() const {
return Is64Bit ? X86::RIP // Should have dwarf #16.
: X86::EIP; // Should have dwarf #8.
return TFI->hasFP(MF) ? FramePtr : StackPtr;
}
-void
-X86RegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves) const {
- // Calculate amount of bytes used for return address storing
- int stackGrowth = (Is64Bit ? -8 : -4);
-
- // Initial state of the frame pointer is esp+stackGrowth.
- MachineLocation Dst(MachineLocation::VirtualFP);
- MachineLocation Src(StackPtr, stackGrowth);
- Moves.push_back(MachineMove(0, Dst, Src));
-
- // Add return address to move list
- MachineLocation CSDst(StackPtr, stackGrowth);
- MachineLocation CSSrc(getRARegister());
- Moves.push_back(MachineMove(0, CSDst, CSSrc));
-}
-
unsigned X86RegisterInfo::getEHExceptionRegister() const {
llvm_unreachable("What is the exception register");
return 0;
projects / oota-llvm.git / blobdiff