#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
using namespace llvm;
+Thumb1FrameLowering::Thumb1FrameLowering(const ARMSubtarget &sti)
+ : ARMFrameLowering(sti) {}
+
bool Thumb1FrameLowering::hasReservedCallFrame(const MachineFunction &MF) const{
const MachineFrameInfo *FFI = MF.getFrameInfo();
unsigned CFSize = FFI->getMaxCallFrameSize();
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
const Thumb1InstrInfo &TII =
- *static_cast<const Thumb1InstrInfo*>(MF.getTarget().getInstrInfo());
- const Thumb1RegisterInfo *RegInfo =
- static_cast<const Thumb1RegisterInfo*>(MF.getTarget().getRegisterInfo());
+ *static_cast<const Thumb1InstrInfo *>(MF.getSubtarget().getInstrInfo());
+ const Thumb1RegisterInfo *RegInfo = static_cast<const Thumb1RegisterInfo *>(
+ MF.getSubtarget().getRegisterInfo());
if (!hasReservedCallFrame(MF)) {
// If we have alloca, convert as follows:
// ADJCALLSTACKDOWN -> sub, sp, sp, amount
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- const Thumb1RegisterInfo *RegInfo =
- static_cast<const Thumb1RegisterInfo*>(MF.getTarget().getRegisterInfo());
+ MachineModuleInfo &MMI = MF.getMMI();
+ const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
+ const Thumb1RegisterInfo *RegInfo = static_cast<const Thumb1RegisterInfo *>(
+ MF.getSubtarget().getRegisterInfo());
const Thumb1InstrInfo &TII =
- *static_cast<const Thumb1InstrInfo*>(MF.getTarget().getInstrInfo());
+ *static_cast<const Thumb1InstrInfo *>(MF.getSubtarget().getInstrInfo());
- unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
+ unsigned Align = MF.getTarget()
+ .getSubtargetImpl()
+ ->getFrameLowering()
+ ->getStackAlignment();
+ unsigned ArgRegsSaveSize = AFI->getArgRegsSaveSize(Align);
unsigned NumBytes = MFI->getStackSize();
+ assert(NumBytes >= ArgRegsSaveSize &&
+ "ArgRegsSaveSize is included in NumBytes");
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
unsigned BasePtr = RegInfo->getBaseRegister();
+ int CFAOffset = 0;
// Thumb add/sub sp, imm8 instructions implicitly multiply the offset by 4.
NumBytes = (NumBytes + 3) & ~3;
unsigned GPRCS1Size = 0, GPRCS2Size = 0, DPRCSSize = 0;
int FramePtrSpillFI = 0;
- if (VARegSaveSize)
- emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, -VARegSaveSize,
+ if (ArgRegsSaveSize) {
+ emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, -ArgRegsSaveSize,
MachineInstr::FrameSetup);
+ CFAOffset -= ArgRegsSaveSize;
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(nullptr, CFAOffset));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
if (!AFI->hasStackFrame()) {
- if (NumBytes != 0)
- emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, -NumBytes,
+ if (NumBytes - ArgRegsSaveSize != 0) {
+ emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, -(NumBytes - ArgRegsSaveSize),
MachineInstr::FrameSetup);
+ CFAOffset -= NumBytes - ArgRegsSaveSize;
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(nullptr, CFAOffset));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
return;
}
unsigned Reg = CSI[i].getReg();
int FI = CSI[i].getFrameIdx();
switch (Reg) {
+ case ARM::R8:
+ case ARM::R9:
+ case ARM::R10:
+ case ARM::R11:
+ if (STI.isTargetMachO()) {
+ GPRCS2Size += 4;
+ break;
+ }
+ // fallthrough
case ARM::R4:
case ARM::R5:
case ARM::R6:
case ARM::LR:
if (Reg == FramePtr)
FramePtrSpillFI = FI;
- AFI->addGPRCalleeSavedArea1Frame(FI);
GPRCS1Size += 4;
break;
- case ARM::R8:
- case ARM::R9:
- case ARM::R10:
- case ARM::R11:
- if (Reg == FramePtr)
- FramePtrSpillFI = FI;
- if (STI.isTargetIOS()) {
- AFI->addGPRCalleeSavedArea2Frame(FI);
- GPRCS2Size += 4;
- } else {
- AFI->addGPRCalleeSavedArea1Frame(FI);
- GPRCS1Size += 4;
- }
- break;
default:
- AFI->addDPRCalleeSavedAreaFrame(FI);
DPRCSSize += 8;
}
}
}
// Determine starting offsets of spill areas.
- unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
+ unsigned DPRCSOffset = NumBytes - ArgRegsSaveSize - (GPRCS1Size + GPRCS2Size + DPRCSSize);
unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
bool HasFP = hasFP(MF);
AFI->setDPRCalleeSavedAreaOffset(DPRCSOffset);
NumBytes = DPRCSOffset;
+ int FramePtrOffsetInBlock = 0;
+ unsigned adjustedGPRCS1Size = GPRCS1Size;
+ if (tryFoldSPUpdateIntoPushPop(STI, MF, std::prev(MBBI), NumBytes)) {
+ FramePtrOffsetInBlock = NumBytes;
+ adjustedGPRCS1Size += NumBytes;
+ NumBytes = 0;
+ }
+
+ if (adjustedGPRCS1Size) {
+ CFAOffset -= adjustedGPRCS1Size;
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(nullptr, CFAOffset));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
+ for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(),
+ E = CSI.end(); I != E; ++I) {
+ unsigned Reg = I->getReg();
+ int FI = I->getFrameIdx();
+ switch (Reg) {
+ case ARM::R8:
+ case ARM::R9:
+ case ARM::R10:
+ case ARM::R11:
+ case ARM::R12:
+ if (STI.isTargetMachO())
+ break;
+ // fallthough
+ case ARM::R0:
+ case ARM::R1:
+ case ARM::R2:
+ case ARM::R3:
+ case ARM::R4:
+ case ARM::R5:
+ case ARM::R6:
+ case ARM::R7:
+ case ARM::LR:
+ unsigned CFIIndex = MMI.addFrameInst(MCCFIInstruction::createOffset(
+ nullptr, MRI->getDwarfRegNum(Reg, true), MFI->getObjectOffset(FI)));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ break;
+ }
+ }
+
+
// Adjust FP so it point to the stack slot that contains the previous FP.
if (HasFP) {
+ FramePtrOffsetInBlock += MFI->getObjectOffset(FramePtrSpillFI)
+ + GPRCS1Size + ArgRegsSaveSize;
AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tADDrSPi), FramePtr)
- .addFrameIndex(FramePtrSpillFI).addImm(0)
+ .addReg(ARM::SP).addImm(FramePtrOffsetInBlock / 4)
.setMIFlags(MachineInstr::FrameSetup));
+ if(FramePtrOffsetInBlock) {
+ CFAOffset += FramePtrOffsetInBlock;
+ unsigned CFIIndex = MMI.addFrameInst(MCCFIInstruction::createDefCfa(
+ nullptr, MRI->getDwarfRegNum(FramePtr, true), CFAOffset));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ } else {
+ unsigned CFIIndex =
+ MMI.addFrameInst(MCCFIInstruction::createDefCfaRegister(
+ nullptr, MRI->getDwarfRegNum(FramePtr, true)));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
if (NumBytes > 508)
// If offset is > 508 then sp cannot be adjusted in a single instruction,
// try restoring from fp instead.
AFI->setShouldRestoreSPFromFP(true);
}
- if (NumBytes)
+ if (NumBytes) {
// Insert it after all the callee-save spills.
emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, -NumBytes,
MachineInstr::FrameSetup);
+ if (!HasFP) {
+ CFAOffset -= NumBytes;
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(nullptr, CFAOffset));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
+ }
if (STI.isTargetELF() && HasFP)
MFI->setOffsetAdjustment(MFI->getOffsetAdjustment() -
AFI->setShouldRestoreSPFromFP(true);
}
-static bool isCalleeSavedRegister(unsigned Reg, const uint16_t *CSRegs) {
- for (unsigned i = 0; CSRegs[i]; ++i)
- if (Reg == CSRegs[i])
- return true;
- return false;
-}
-
-static bool isCSRestore(MachineInstr *MI, const uint16_t *CSRegs) {
+static bool isCSRestore(MachineInstr *MI, const MCPhysReg *CSRegs) {
if (MI->getOpcode() == ARM::tLDRspi &&
MI->getOperand(1).isFI() &&
isCalleeSavedRegister(MI->getOperand(0).getReg(), CSRegs))
DebugLoc dl = MBBI->getDebugLoc();
MachineFrameInfo *MFI = MF.getFrameInfo();
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- const Thumb1RegisterInfo *RegInfo =
- static_cast<const Thumb1RegisterInfo*>(MF.getTarget().getRegisterInfo());
+ const Thumb1RegisterInfo *RegInfo = static_cast<const Thumb1RegisterInfo *>(
+ MF.getSubtarget().getRegisterInfo());
const Thumb1InstrInfo &TII =
- *static_cast<const Thumb1InstrInfo*>(MF.getTarget().getInstrInfo());
+ *static_cast<const Thumb1InstrInfo *>(MF.getSubtarget().getInstrInfo());
- unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
+ unsigned Align = MF.getTarget()
+ .getSubtargetImpl()
+ ->getFrameLowering()
+ ->getStackAlignment();
+ unsigned ArgRegsSaveSize = AFI->getArgRegsSaveSize(Align);
int NumBytes = (int)MFI->getStackSize();
- const uint16_t *CSRegs = RegInfo->getCalleeSavedRegs();
+ assert((unsigned)NumBytes >= ArgRegsSaveSize &&
+ "ArgRegsSaveSize is included in NumBytes");
+ const MCPhysReg *CSRegs = RegInfo->getCalleeSavedRegs();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
if (!AFI->hasStackFrame()) {
- if (NumBytes != 0)
- emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, NumBytes);
+ if (NumBytes - ArgRegsSaveSize != 0)
+ emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, NumBytes - ArgRegsSaveSize);
} else {
// Unwind MBBI to point to first LDR / VLDRD.
if (MBBI != MBB.begin()) {
// Move SP to start of FP callee save spill area.
NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
AFI->getGPRCalleeSavedArea2Size() +
- AFI->getDPRCalleeSavedAreaSize());
+ AFI->getDPRCalleeSavedAreaSize() +
+ ArgRegsSaveSize);
if (AFI->shouldRestoreSPFromFP()) {
NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
} else {
if (MBBI->getOpcode() == ARM::tBX_RET &&
&MBB.front() != MBBI &&
- prior(MBBI)->getOpcode() == ARM::tPOP) {
- MachineBasicBlock::iterator PMBBI = prior(MBBI);
- emitSPUpdate(MBB, PMBBI, TII, dl, *RegInfo, NumBytes);
- } else
+ std::prev(MBBI)->getOpcode() == ARM::tPOP) {
+ MachineBasicBlock::iterator PMBBI = std::prev(MBBI);
+ if (!tryFoldSPUpdateIntoPushPop(STI, MF, PMBBI, NumBytes))
+ emitSPUpdate(MBB, PMBBI, TII, dl, *RegInfo, NumBytes);
+ } else if (!tryFoldSPUpdateIntoPushPop(STI, MF, MBBI, NumBytes))
emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, NumBytes);
}
}
- if (VARegSaveSize) {
- // Unlike T2 and ARM mode, the T1 pop instruction cannot restore
- // to LR, and we can't pop the value directly to the PC since
- // we need to update the SP after popping the value. Therefore, we
- // pop the old LR into R3 as a temporary.
-
- // Move back past the callee-saved register restoration
- while (MBBI != MBB.end() && isCSRestore(MBBI, CSRegs))
- ++MBBI;
- // Epilogue for vararg functions: pop LR to R3 and branch off it.
- AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tPOP)))
- .addReg(ARM::R3, RegState::Define);
-
- emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, VARegSaveSize);
-
- MachineInstrBuilder MIB =
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tBX_RET_vararg))
- .addReg(ARM::R3, RegState::Kill);
- AddDefaultPred(MIB);
- MIB.copyImplicitOps(&*MBBI);
- // erase the old tBX_RET instruction
- MBB.erase(MBBI);
+ bool IsV4PopReturn = false;
+ for (const CalleeSavedInfo &CSI : MFI->getCalleeSavedInfo())
+ if (CSI.getReg() == ARM::LR)
+ IsV4PopReturn = true;
+ IsV4PopReturn &= STI.hasV4TOps() && !STI.hasV5TOps();
+
+ // Unlike T2 and ARM mode, the T1 pop instruction cannot restore
+ // to LR, and we can't pop the value directly to the PC since
+ // we need to update the SP after popping the value. So instead
+ // we have to emit:
+ // POP {r3}
+ // ADD sp, #offset
+ // BX r3
+ // If this would clobber a return value, then generate this sequence instead:
+ // MOV ip, r3
+ // POP {r3}
+ // ADD sp, #offset
+ // MOV lr, r3
+ // MOV r3, ip
+ // BX lr
+ if (ArgRegsSaveSize || IsV4PopReturn) {
+ // Get the last instruction, tBX_RET
+ MBBI = MBB.getLastNonDebugInstr();
+ assert (MBBI->getOpcode() == ARM::tBX_RET);
+ DebugLoc dl = MBBI->getDebugLoc();
+
+ if (AFI->getReturnRegsCount() <= 3) {
+ // Epilogue: pop saved LR to R3 and branch off it.
+ AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tPOP)))
+ .addReg(ARM::R3, RegState::Define);
+
+ emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, ArgRegsSaveSize);
+
+ MachineInstrBuilder MIB =
+ BuildMI(MBB, MBBI, dl, TII.get(ARM::tBX))
+ .addReg(ARM::R3, RegState::Kill);
+ AddDefaultPred(MIB);
+ MIB.copyImplicitOps(&*MBBI);
+ // erase the old tBX_RET instruction
+ MBB.erase(MBBI);
+ } else {
+ AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVr))
+ .addReg(ARM::R12, RegState::Define)
+ .addReg(ARM::R3, RegState::Kill));
+
+ AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tPOP)))
+ .addReg(ARM::R3, RegState::Define);
+
+ emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, ArgRegsSaveSize);
+
+ AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVr))
+ .addReg(ARM::LR, RegState::Define)
+ .addReg(ARM::R3, RegState::Kill));
+
+ AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVr))
+ .addReg(ARM::R3, RegState::Define)
+ .addReg(ARM::R12, RegState::Kill));
+ // Keep the tBX_RET instruction
+ }
}
}
DebugLoc DL;
MachineFunction &MF = *MBB.getParent();
- const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
+ const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
if (MI != MBB.end()) DL = MI->getDebugLoc();
MachineFunction &MF = *MBB.getParent();
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
+ const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
- bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
+ bool isVarArg = AFI->getArgRegsSaveSize() > 0;
DebugLoc DL = MI->getDebugLoc();
MachineInstrBuilder MIB = BuildMI(MF, DL, TII.get(ARM::tPOP));
AddDefaultPred(MIB);
// Special epilogue for vararg functions. See emitEpilogue
if (isVarArg)
continue;
+ // ARMv4T requires BX, see emitEpilogue
+ if (STI.hasV4TOps() && !STI.hasV5TOps())
+ continue;
Reg = ARM::PC;
(*MIB).setDesc(TII.get(ARM::tPOP_RET));
MIB.copyImplicitOps(&*MI);
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