#include "PPCInstrInfo.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCSubtarget.h"
+#include "PPCTargetMachine.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
PPC::V24, PPC::V25, PPC::V26, PPC::V27, PPC::V28, PPC::V29, PPC::V30, PPC::V31
};
+static unsigned computeReturnSaveOffset(const PPCSubtarget &STI) {
+ if (STI.isDarwinABI())
+ return STI.isPPC64() ? 16 : 8;
+ // SVR4 ABI:
+ return STI.isPPC64() ? 16 : 4;
+}
+
+static unsigned computeTOCSaveOffset(const PPCSubtarget &STI) {
+ return STI.isELFv2ABI() ? 24 : 40;
+}
+
+static unsigned computeFramePointerSaveOffset(const PPCSubtarget &STI) {
+ // For the Darwin ABI:
+ // We cannot use the TOC save slot (offset +20) in the PowerPC linkage area
+ // for saving the frame pointer (if needed.) While the published ABI has
+ // not used this slot since at least MacOSX 10.2, there is older code
+ // around that does use it, and that needs to continue to work.
+ if (STI.isDarwinABI())
+ return STI.isPPC64() ? -8U : -4U;
+
+ // SVR4 ABI: First slot in the general register save area.
+ return STI.isPPC64() ? -8U : -4U;
+}
+
+static unsigned computeLinkageSize(const PPCSubtarget &STI) {
+ if (STI.isDarwinABI() || STI.isPPC64())
+ return (STI.isELFv2ABI() ? 4 : 6) * (STI.isPPC64() ? 8 : 4);
+
+ // SVR4 ABI:
+ return 8;
+}
+
+static unsigned computeBasePointerSaveOffset(const PPCSubtarget &STI) {
+ if (STI.isDarwinABI())
+ return STI.isPPC64() ? -16U : -8U;
+
+ // SVR4 ABI: First slot in the general register save area.
+ return STI.isPPC64()
+ ? -16U
+ : (STI.getTargetMachine().getRelocationModel() == Reloc::PIC_)
+ ? -12U
+ : -8U;
+}
+
PPCFrameLowering::PPCFrameLowering(const PPCSubtarget &STI)
: TargetFrameLowering(TargetFrameLowering::StackGrowsDown,
- (STI.hasQPX() || STI.isBGQ()) ? 32 : 16, 0),
- Subtarget(STI) {}
+ STI.getPlatformStackAlignment(), 0),
+ Subtarget(STI), ReturnSaveOffset(computeReturnSaveOffset(Subtarget)),
+ TOCSaveOffset(computeTOCSaveOffset(Subtarget)),
+ FramePointerSaveOffset(computeFramePointerSaveOffset(Subtarget)),
+ LinkageSize(computeLinkageSize(Subtarget)),
+ BasePointerSaveOffset(computeBasePointerSaveOffset(STI)) {}
// With the SVR4 ABI, callee-saved registers have fixed offsets on the stack.
const PPCFrameLowering::SpillSlot *PPCFrameLowering::getCalleeSavedSpillSlots(
return FuncInfo->hasNonRISpills();
}
+/// MustSaveLR - Return true if this function requires that we save the LR
+/// register onto the stack in the prolog and restore it in the epilog of the
+/// function.
+static bool MustSaveLR(const MachineFunction &MF, unsigned LR) {
+ const PPCFunctionInfo *MFI = MF.getInfo<PPCFunctionInfo>();
+
+ // We need a save/restore of LR if there is any def of LR (which is
+ // defined by calls, including the PIC setup sequence), or if there is
+ // some use of the LR stack slot (e.g. for builtin_return_address).
+ // (LR comes in 32 and 64 bit versions.)
+ MachineRegisterInfo::def_iterator RI = MF.getRegInfo().def_begin(LR);
+ return RI !=MF.getRegInfo().def_end() || MFI->isLRStoreRequired();
+}
+
/// determineFrameLayout - Determine the size of the frame and maximum call
/// frame size.
unsigned PPCFrameLowering::determineFrameLayout(MachineFunction &MF,
unsigned AlignMask = std::max(MaxAlign, TargetAlign) - 1;
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo *>(MF.getSubtarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
// If we are a leaf function, and use up to 224 bytes of stack space,
// don't have a frame pointer, calls, or dynamic alloca then we do not need
// to adjust the stack pointer (we fit in the Red Zone).
// The 32-bit SVR4 ABI has no Red Zone. However, it can still generate
// stackless code if all local vars are reg-allocated.
- bool DisableRedZone = MF.getFunction()->getAttributes().
- hasAttribute(AttributeSet::FunctionIndex, Attribute::NoRedZone);
+ bool DisableRedZone = MF.getFunction()->hasFnAttribute(Attribute::NoRedZone);
+ unsigned LR = RegInfo->getRARegister();
if (!DisableRedZone &&
(Subtarget.isPPC64() || // 32-bit SVR4, no stack-
!Subtarget.isSVR4ABI() || // allocated locals.
FrameSize <= 224 && // Fits in red zone.
!MFI->hasVarSizedObjects() && // No dynamic alloca.
!MFI->adjustsStack() && // No calls.
+ !MustSaveLR(MF, LR) &&
!RegInfo->hasBasePointer(MF)) { // No special alignment.
// No need for frame
if (UpdateMF)
unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
// Maximum call frame needs to be at least big enough for linkage area.
- unsigned minCallFrameSize = getLinkageSize(Subtarget.isPPC64(),
- Subtarget.isDarwinABI(),
- Subtarget.isELFv2ABI());
+ unsigned minCallFrameSize = getLinkageSize();
maxCallFrameSize = std::max(maxCallFrameSize, minCallFrameSize);
// If we have dynamic alloca then maxCallFrameSize needs to be aligned so
// Naked functions have no stack frame pushed, so we don't have a frame
// pointer.
- if (MF.getFunction()->getAttributes().hasAttribute(
- AttributeSet::FunctionIndex, Attribute::Naked))
+ if (MF.getFunction()->hasFnAttribute(Attribute::Naked))
return false;
return MF.getTarget().Options.DisableFramePointerElim(MF) ||
MFI->hasVarSizedObjects() ||
+ MFI->hasStackMap() || MFI->hasPatchPoint() ||
(MF.getTarget().Options.GuaranteedTailCallOpt &&
MF.getInfo<PPCFunctionInfo>()->hasFastCall());
}
unsigned FP8Reg = is31 ? PPC::X31 : PPC::X1;
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo *>(MF.getSubtarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
bool HasBP = RegInfo->hasBasePointer(MF);
unsigned BPReg = HasBP ? (unsigned) RegInfo->getBaseRegister(MF) : FPReg;
unsigned BP8Reg = HasBP ? (unsigned) PPC::X30 : FPReg;
}
}
-void PPCFrameLowering::emitPrologue(MachineFunction &MF) const {
- MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
+void PPCFrameLowering::emitPrologue(MachineFunction &MF,
+ MachineBasicBlock &MBB) const {
+ assert(&MF.front() == &MBB && "Shrink-wrapping not yet supported");
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo *>(MF.getSubtarget().getInstrInfo());
+ *static_cast<const PPCInstrInfo *>(Subtarget.getInstrInfo());
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo *>(MF.getSubtarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
MachineModuleInfo &MMI = MF.getMMI();
const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
DebugLoc dl;
bool needsCFI = MMI.hasDebugInfo() ||
MF.getFunction()->needsUnwindTableEntry();
- bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
// Get processor type.
bool isPPC64 = Subtarget.isPPC64();
// Get the ABI.
- bool isDarwinABI = Subtarget.isDarwinABI();
bool isSVR4ABI = Subtarget.isSVR4ABI();
bool isELFv2ABI = Subtarget.isELFv2ABI();
- assert((isDarwinABI || isSVR4ABI) &&
+ assert((Subtarget.isDarwinABI() || isSVR4ABI) &&
"Currently only Darwin and SVR4 ABIs are supported for PowerPC.");
// Scan the prolog, looking for an UPDATE_VRSAVE instruction. If we find it,
assert((isPPC64 || !isSVR4ABI || !(!FrameSize && (MustSaveLR || HasFP))) &&
"FrameSize must be >0 to save/restore the FP or LR for 32-bit SVR4.");
- int LROffset = PPCFrameLowering::getReturnSaveOffset(isPPC64, isDarwinABI);
+ int LROffset = getReturnSaveOffset();
int FPOffset = 0;
if (HasFP) {
assert(FPIndex && "No Frame Pointer Save Slot!");
FPOffset = FFI->getObjectOffset(FPIndex);
} else {
- FPOffset =
- PPCFrameLowering::getFramePointerSaveOffset(isPPC64, isDarwinABI);
+ FPOffset = getFramePointerSaveOffset();
}
}
assert(BPIndex && "No Base Pointer Save Slot!");
BPOffset = FFI->getObjectOffset(BPIndex);
} else {
- BPOffset =
- PPCFrameLowering::getBasePointerSaveOffset(isPPC64,
- isDarwinABI,
- isPIC);
+ BPOffset = getBasePointerSaveOffset();
}
}
+ int PBPOffset = 0;
+ if (FI->usesPICBase()) {
+ MachineFrameInfo *FFI = MF.getFrameInfo();
+ int PBPIndex = FI->getPICBasePointerSaveIndex();
+ assert(PBPIndex && "No PIC Base Pointer Save Slot!");
+ PBPOffset = FFI->getObjectOffset(PBPIndex);
+ }
+
// Get stack alignments.
unsigned MaxAlign = MFI->getMaxAlignment();
if (HasBP && MaxAlign > 1)
.addImm(FPOffset)
.addReg(SPReg);
- if (isPIC && !isDarwinABI && !isPPC64 &&
- MF.getInfo<PPCFunctionInfo>()->usesPICBase())
+ if (FI->usesPICBase())
// FIXME: On PPC32 SVR4, we must not spill before claiming the stackframe.
BuildMI(MBB, MBBI, dl, StoreInst)
.addReg(PPC::R30)
- .addImm(-8U)
+ .addImm(PBPOffset)
.addReg(SPReg);
if (HasBP)
.addCFIIndex(CFIIndex);
}
+ if (FI->usesPICBase()) {
+ // Describe where FP was saved, at a fixed offset from CFA.
+ unsigned Reg = MRI->getDwarfRegNum(PPC::R30, true);
+ CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createOffset(nullptr, Reg, PBPOffset));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
+
if (HasBP) {
// Describe where BP was saved, at a fixed offset from CFA.
unsigned Reg = MRI->getDwarfRegNum(BPReg, true);
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
assert(MBBI != MBB.end() && "Returning block has no terminator");
const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo *>(MF.getSubtarget().getInstrInfo());
+ *static_cast<const PPCInstrInfo *>(Subtarget.getInstrInfo());
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo *>(MF.getSubtarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
unsigned RetOpcode = MBBI->getOpcode();
DebugLoc dl;
assert((RetOpcode == PPC::BLR ||
+ RetOpcode == PPC::BLR8 ||
RetOpcode == PPC::TCRETURNri ||
RetOpcode == PPC::TCRETURNdi ||
RetOpcode == PPC::TCRETURNai ||
// Get processor type.
bool isPPC64 = Subtarget.isPPC64();
// Get the ABI.
- bool isDarwinABI = Subtarget.isDarwinABI();
bool isSVR4ABI = Subtarget.isSVR4ABI();
- bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
// Check if the link register (LR) has been saved.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
const MCInstrDesc& AddInst = TII.get( isPPC64 ? PPC::ADD8
: PPC::ADD4 );
- int LROffset = PPCFrameLowering::getReturnSaveOffset(isPPC64, isDarwinABI);
+ int LROffset = getReturnSaveOffset();
int FPOffset = 0;
if (HasFP) {
assert(FPIndex && "No Frame Pointer Save Slot!");
FPOffset = FFI->getObjectOffset(FPIndex);
} else {
- FPOffset =
- PPCFrameLowering::getFramePointerSaveOffset(isPPC64, isDarwinABI);
+ FPOffset = getFramePointerSaveOffset();
}
}
assert(BPIndex && "No Base Pointer Save Slot!");
BPOffset = FFI->getObjectOffset(BPIndex);
} else {
- BPOffset =
- PPCFrameLowering::getBasePointerSaveOffset(isPPC64,
- isDarwinABI,
- isPIC);
+ BPOffset = getBasePointerSaveOffset();
}
}
+ int PBPOffset = 0;
+ if (FI->usesPICBase()) {
+ MachineFrameInfo *FFI = MF.getFrameInfo();
+ int PBPIndex = FI->getPICBasePointerSaveIndex();
+ assert(PBPIndex && "No PIC Base Pointer Save Slot!");
+ PBPOffset = FFI->getObjectOffset(PBPIndex);
+ }
+
bool UsesTCRet = RetOpcode == PPC::TCRETURNri ||
RetOpcode == PPC::TCRETURNdi ||
RetOpcode == PPC::TCRETURNai ||
.addImm(FPOffset)
.addReg(SPReg);
- if (isPIC && !isDarwinABI && !isPPC64 &&
- MF.getInfo<PPCFunctionInfo>()->usesPICBase())
+ if (FI->usesPICBase())
// FIXME: On PPC32 SVR4, we must not spill before claiming the stackframe.
BuildMI(MBB, MBBI, dl, LoadInst)
.addReg(PPC::R30)
- .addImm(-8U)
+ .addImm(PBPOffset)
.addReg(SPReg);
if (HasBP)
// Callee pop calling convention. Pop parameter/linkage area. Used for tail
// call optimization
- if (MF.getTarget().Options.GuaranteedTailCallOpt && RetOpcode == PPC::BLR &&
+ if (MF.getTarget().Options.GuaranteedTailCallOpt &&
+ (RetOpcode == PPC::BLR || RetOpcode == PPC::BLR8) &&
MF.getFunction()->getCallingConv() == CallingConv::Fast) {
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
unsigned CallerAllocatedAmt = FI->getMinReservedArea();
}
}
-/// MustSaveLR - Return true if this function requires that we save the LR
-/// register onto the stack in the prolog and restore it in the epilog of the
-/// function.
-static bool MustSaveLR(const MachineFunction &MF, unsigned LR) {
- const PPCFunctionInfo *MFI = MF.getInfo<PPCFunctionInfo>();
-
- // We need a save/restore of LR if there is any def of LR (which is
- // defined by calls, including the PIC setup sequence), or if there is
- // some use of the LR stack slot (e.g. for builtin_return_address).
- // (LR comes in 32 and 64 bit versions.)
- MachineRegisterInfo::def_iterator RI = MF.getRegInfo().def_begin(LR);
- return RI !=MF.getRegInfo().def_end() || MFI->isLRStoreRequired();
-}
-
void
PPCFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *) const {
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo *>(MF.getSubtarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
// Save and clear the LR state.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
int FPSI = FI->getFramePointerSaveIndex();
bool isPPC64 = Subtarget.isPPC64();
bool isDarwinABI = Subtarget.isDarwinABI();
- bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
MachineFrameInfo *MFI = MF.getFrameInfo();
// If the frame pointer save index hasn't been defined yet.
if (!FPSI && needsFP(MF)) {
// Find out what the fix offset of the frame pointer save area.
- int FPOffset = getFramePointerSaveOffset(isPPC64, isDarwinABI);
+ int FPOffset = getFramePointerSaveOffset();
// Allocate the frame index for frame pointer save area.
FPSI = MFI->CreateFixedObject(isPPC64? 8 : 4, FPOffset, true);
// Save the result.
int BPSI = FI->getBasePointerSaveIndex();
if (!BPSI && RegInfo->hasBasePointer(MF)) {
- int BPOffset = getBasePointerSaveOffset(isPPC64, isDarwinABI, isPIC);
+ int BPOffset = getBasePointerSaveOffset();
// Allocate the frame index for the base pointer save area.
BPSI = MFI->CreateFixedObject(isPPC64? 8 : 4, BPOffset, true);
// Save the result.
FI->setBasePointerSaveIndex(BPSI);
}
+ // Reserve stack space for the PIC Base register (R30).
+ // Only used in SVR4 32-bit.
+ if (FI->usesPICBase()) {
+ int PBPSI = FI->getPICBasePointerSaveIndex();
+ PBPSI = MFI->CreateFixedObject(4, -8, true);
+ FI->setPICBasePointerSaveIndex(PBPSI);
+ }
+
// Reserve stack space to move the linkage area to in case of a tail call.
int TCSPDelta = 0;
if (MF.getTarget().Options.GuaranteedTailCallOpt &&
}
PPCFunctionInfo *PFI = MF.getInfo<PPCFunctionInfo>();
- const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
+ const TargetRegisterInfo *TRI = Subtarget.getRegisterInfo();
int64_t LowerBound = 0;
FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
}
+ if (PFI->usesPICBase()) {
+ HasGPSaveArea = true;
+
+ int FI = PFI->getPICBasePointerSaveIndex();
+ assert(FI && "No PIC Base Pointer Save Slot!");
+
+ FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
+ }
+
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo *>(MF.getSubtarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
if (RegInfo->hasBasePointer(MF)) {
HasGPSaveArea = true;
MachineFunction *MF = MBB.getParent();
const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo *>(MF->getSubtarget().getInstrInfo());
+ *static_cast<const PPCInstrInfo *>(Subtarget.getInstrInfo());
DebugLoc DL;
bool CRSpilled = false;
MachineInstrBuilder CRMIB;
const std::vector<CalleeSavedInfo> &CSI, unsigned CSIIndex) {
MachineFunction *MF = MBB.getParent();
- const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo *>(MF->getSubtarget().getInstrInfo());
+ const PPCInstrInfo &TII = *MF->getSubtarget<PPCSubtarget>().getInstrInfo();
DebugLoc DL;
unsigned RestoreOp, MoveReg;
void PPCFrameLowering::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
- const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo *>(MF.getSubtarget().getInstrInfo());
+ const TargetInstrInfo &TII = *Subtarget.getInstrInfo();
if (MF.getTarget().Options.GuaranteedTailCallOpt &&
I->getOpcode() == PPC::ADJCALLSTACKUP) {
// Add (actually subtract) back the amount the callee popped on return.
MachineFunction *MF = MBB.getParent();
const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo *>(MF->getSubtarget().getInstrInfo());
+ *static_cast<const PPCInstrInfo *>(Subtarget.getInstrInfo());
bool CR2Spilled = false;
bool CR3Spilled = false;
bool CR4Spilled = false;
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