AArch64FrameLowering.cpp File Reference

#include "AArch64FrameLowering.h"
#include "AArch64InstrInfo.h"
#include "AArch64MachineFunctionInfo.h"
#include "AArch64RegisterInfo.h"
#include "AArch64Subtarget.h"
#include "AArch64TargetMachine.h"
#include "MCTargetDesc/AArch64AddressingModes.h"
#include "MCTargetDesc/AArch64MCTargetDesc.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/LivePhysRegs.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/CodeGen/WinEHFuncInfo.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/Function.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <cassert>
#include <cstdint>
#include <iterator>
#include <optional>
#include <vector>

Go to the source code of this file.

Classes
struct	StackAccess

Macros
#define	DEBUG_TYPE   "frame-info"
#define	CASE(n)
#define	CASE(n)

Functions
	STATISTIC (NumRedZoneFunctions, "Number of functions using red zone")
static int64_t	getArgumentStackToRestore (MachineFunction &MF, MachineBasicBlock &MBB)
	Returns how much of the incoming argument stack area (in bytes) we should clean up in an epilogue.
static bool	produceCompactUnwindFrame (MachineFunction &MF)
static bool	needsWinCFI (const MachineFunction &MF)
static StackOffset	getSVEStackSize (const MachineFunction &MF)
	Returns the size of the entire SVE stackframe (calleesaves + spills).
static Register	findScratchNonCalleeSaveRegister (MachineBasicBlock *MBB)
static unsigned	estimateRSStackSizeLimit (MachineFunction &MF)
	Look at each instruction that references stack frames and return the stack size limit beyond which some of these instructions will require a scratch register during their expansion later.
static unsigned	getFixedObjectSize (const MachineFunction &MF, const AArch64FunctionInfo *AFI, bool IsWin64, bool IsFunclet)
	Returns the size of the fixed object area (allocated next to sp on entry) On Win64 this may include a var args area and an UnwindHelp object for EH.
static void	insertCFISameValue (const MCInstrDesc &Desc, MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt, unsigned DwarfReg)
static void	emitCalleeSavedRestores (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, bool SVE)
static int64_t	upperBound (StackOffset Size)
static MCRegister	getRegisterOrZero (MCRegister Reg, bool HasSVE)
static void	getLiveRegsForEntryMBB (LivePhysRegs &LiveRegs, const MachineBasicBlock &MBB)
static bool	windowsRequiresStackProbe (MachineFunction &MF, uint64_t StackSizeInBytes)
static MachineBasicBlock::iterator	InsertSEH (MachineBasicBlock::iterator MBBI, const TargetInstrInfo &TII, MachineInstr::MIFlag Flag)
static void	fixupSEHOpcode (MachineBasicBlock::iterator MBBI, unsigned LocalStackSize)
bool	requiresGetVGCall (MachineFunction &MF)
static bool	requiresSaveVG (MachineFunction &MF)
bool	isVGInstruction (MachineBasicBlock::iterator MBBI)
static MachineBasicBlock::iterator	convertCalleeSaveRestoreToSPPrePostIncDec (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL, const TargetInstrInfo *TII, int CSStackSizeInc, bool NeedsWinCFI, bool *HasWinCFI, bool EmitCFI, MachineInstr::MIFlag FrameFlag=MachineInstr::FrameSetup, int CFAOffset=0)
static void	fixupCalleeSaveRestoreStackOffset (MachineInstr &MI, uint64_t LocalStackSize, bool NeedsWinCFI, bool *HasWinCFI)
static bool	isTargetWindows (const MachineFunction &MF)
static bool	IsSVECalleeSave (MachineBasicBlock::iterator I)
static void	emitShadowCallStackPrologue (const TargetInstrInfo &TII, MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL, bool NeedsWinCFI, bool NeedsUnwindInfo)
static void	emitShadowCallStackEpilogue (const TargetInstrInfo &TII, MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL)
static void	emitDefineCFAWithFP (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL, unsigned FixedObject)
static void	getLivePhysRegsUpTo (MachineInstr &MI, const TargetRegisterInfo &TRI, LivePhysRegs &LiveRegs)
	Collect live registers from the end of MI's parent up to (including) MI in LiveRegs.
static bool	isFuncletReturnInstr (const MachineInstr &MI)
static StackOffset	getFPOffset (const MachineFunction &MF, int64_t ObjectOffset)
static StackOffset	getStackOffset (const MachineFunction &MF, int64_t ObjectOffset)
static unsigned	getPrologueDeath (MachineFunction &MF, unsigned Reg)
static bool	invalidateWindowsRegisterPairing (unsigned Reg1, unsigned Reg2, bool NeedsWinCFI, bool IsFirst, const TargetRegisterInfo *TRI)
static bool	invalidateRegisterPairing (unsigned Reg1, unsigned Reg2, bool UsesWinAAPCS, bool NeedsWinCFI, bool NeedsFrameRecord, bool IsFirst, const TargetRegisterInfo *TRI)
	Returns true if Reg1 and Reg2 cannot be paired using a ldp/stp instruction.
unsigned	findFreePredicateReg (BitVector &SavedRegs)
static void	computeCalleeSaveRegisterPairs (MachineFunction &MF, ArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI, SmallVectorImpl< RegPairInfo > &RegPairs, bool NeedsFrameRecord)
static std::optional< int >	getMMOFrameID (MachineMemOperand *MMO, const MachineFrameInfo &MFI)
static std::optional< int >	getLdStFrameID (const MachineInstr &MI, const MachineFrameInfo &MFI)
static bool	getSVECalleeSaveSlotRange (const MachineFrameInfo &MFI, int &Min, int &Max)
	returns true if there are any SVE callee saves.
static int64_t	determineSVEStackObjectOffsets (MachineFrameInfo &MFI, int &MinCSFrameIndex, int &MaxCSFrameIndex, bool AssignOffsets)
MachineBasicBlock::iterator	emitVGSaveRestore (MachineBasicBlock::iterator II, const AArch64FrameLowering *TFI)
static raw_ostream &	operator<< (raw_ostream &OS, const StackAccess &SA)

Variables
static cl::opt< bool >	EnableRedZone ("aarch64-redzone", cl::desc("enable use of redzone on AArch64"), cl::init(false), cl::Hidden)
static cl::opt< bool >	StackTaggingMergeSetTag ("stack-tagging-merge-settag", cl::desc("merge settag instruction in function epilog"), cl::init(true), cl::Hidden)
static cl::opt< bool >	OrderFrameObjects ("aarch64-order-frame-objects", cl::desc("sort stack allocations"), cl::init(true), cl::Hidden)
cl::opt< bool >	EnableHomogeneousPrologEpilog ("homogeneous-prolog-epilog", cl::Hidden, cl::desc("Emit homogeneous prologue and epilogue for the size " "optimization (default = off)"))
static cl::opt< unsigned >	StackHazardSize ("aarch64-stack-hazard-size", cl::init(0), cl::Hidden)
static cl::opt< unsigned >	StackHazardRemarkSize ("aarch64-stack-hazard-remark-size", cl::init(0), cl::Hidden)
static cl::opt< bool >	StackHazardInNonStreaming ("aarch64-stack-hazard-in-non-streaming", cl::init(false), cl::Hidden)
static const unsigned	DefaultSafeSPDisplacement = 255
	This is the biggest offset to the stack pointer we can encode in aarch64 instructions (without using a separate calculation and a temp register).

Macro Definition Documentation

CASE [1/2]

#define CASE

(

n

)

Value:

  case AArch64::W##n:                                                          \
  case AArch64::X##n:                                                          \
    return AArch64::X##n

CASE [2/2]

#define CASE

(

n

)

Value:

  case AArch64::B##n:                                                          \
  case AArch64::H##n:                                                          \
  case AArch64::S##n:                                                          \
  case AArch64::D##n:                                                          \
  case AArch64::Q##n:                                                          \
    return HasSVE ? AArch64::Z##n : AArch64::Q##n

DEBUG_TYPE

#define DEBUG_TYPE   "frame-info"

Definition at line 256 of file AArch64FrameLowering.cpp.

Function Documentation

computeCalleeSaveRegisterPairs()

static void computeCalleeSaveRegisterPairs ( MachineFunction &  MF, ArrayRef< CalleeSavedInfo >  CSI, const TargetRegisterInfo *  TRI, SmallVectorImpl< RegPairInfo > &  RegPairs, bool  NeedsFrameRecord  )

static

Definition at line 2957 of file AArch64FrameLowering.cpp.

References assert(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), CC, contains(), llvm::CallingConv::CXX_FAST_TLS, llvm::ArrayRef< T >::empty(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::AArch64FunctionInfo::getCalleeSavedStackSize(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::AArch64FunctionInfo::getPredicateRegForFillSpill(), llvm::AArch64FunctionInfo::getSVECalleeSavedStackSize(), llvm::AArch64FunctionInfo::hasCalleeSaveStackFreeSpace(), llvm::AArch64FunctionInfo::hasStackHazardSlotIndex(), llvm::AArch64FunctionInfo::hasSwiftAsyncContext(), invalidateRegisterPairing(), invalidateWindowsRegisterPairing(), llvm::AArch64InstrInfo::isFpOrNEON(), isTargetWindows(), llvm_unreachable, needsWinCFI(), llvm::Offset, llvm::CallingConv::PreserveAll, llvm::CallingConv::PreserveMost, produceCompactUnwindFrame(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::AArch64FunctionInfo::setCalleeSaveBaseToFrameRecordOffset(), llvm::ArrayRef< T >::size(), StackHazardSize, TRI, and llvm::CallingConv::Win64.

Referenced by llvm::AArch64FrameLowering::restoreCalleeSavedRegisters(), and llvm::AArch64FrameLowering::spillCalleeSavedRegisters().

convertCalleeSaveRestoreToSPPrePostIncDec()

static MachineBasicBlock::iterator convertCalleeSaveRestoreToSPPrePostIncDec ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI, const DebugLoc &  DL, const TargetInstrInfo *  TII, int  CSStackSizeInc, bool  NeedsWinCFI, bool *  HasWinCFI, bool  EmitCFI, MachineInstr::MIFlag  FrameFlag = MachineInstr::FrameSetup, int  CFAOffset = 0  )

static

Definition at line 1432 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::add(), llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), assert(), llvm::BuildMI(), llvm::MCCFIInstruction::cfiDefCfaOffset(), llvm::RegState::Define, DL, llvm::emitFrameOffset(), llvm::MachineBasicBlock::erase(), llvm::MachineInstr::FrameDestroy, llvm::StackOffset::getFixed(), llvm::TypeSize::getFixed(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::getFixedValue(), llvm::MachineBasicBlock::getParent(), InsertSEH(), llvm::AArch64InstrInfo::isSEHInstruction(), isVGInstruction(), llvm_unreachable, MBB, MBBI, requiresSaveVG(), llvm::MachineInstrBuilder::setMemRefs(), llvm::MachineInstrBuilder::setMIFlags(), Success, and TII.

Referenced by llvm::AArch64FrameLowering::emitEpilogue(), and llvm::AArch64FrameLowering::emitPrologue().

determineSVEStackObjectOffsets()

static int64_t determineSVEStackObjectOffsets ( MachineFrameInfo &  MFI, int &  MinCSFrameIndex, int &  MaxCSFrameIndex, bool  AssignOffsets  )

static

Definition at line 4054 of file AArch64FrameLowering.cpp.

References llvm::alignTo(), assert(), llvm::dbgs(), llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectIndexBegin(), llvm::MachineFrameInfo::getObjectIndexEnd(), llvm::MachineFrameInfo::getObjectSize(), llvm::MachineFrameInfo::getStackID(), llvm::MachineFrameInfo::getStackProtectorIndex(), getSVECalleeSaveSlotRange(), llvm::MachineFrameInfo::hasStackProtectorIndex(), I, llvm::MachineFrameInfo::isDeadObjectIndex(), LLVM_DEBUG, llvm::Offset, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::report_fatal_error(), llvm::TargetStackID::ScalableVector, and llvm::MachineFrameInfo::setObjectOffset().

emitCalleeSavedRestores()

static void emitCalleeSavedRestores ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI, bool  SVE  )

static

Definition at line 721 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MCCFIInstruction::createRestore(), DL, llvm::MachineBasicBlock::findDebugLoc(), llvm::MachineInstr::FrameDestroy, llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineFunction::getFrameInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineBasicBlock::getParent(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFrameInfo::getStackID(), llvm::MachineFunction::getSubtarget(), Info, MBB, MBBI, llvm::TargetStackID::ScalableVector, llvm::MachineInstrBuilder::setMIFlags(), llvm::SVE, TII, and TRI.

emitDefineCFAWithFP()

static void emitDefineCFAWithFP ( MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI, const DebugLoc &  DL, unsigned  FixedObject  )

static

Definition at line 1691 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MCCFIInstruction::cfiDefCfa(), DL, FramePtr, llvm::MachineInstr::FrameSetup, llvm::AArch64FunctionInfo::getCalleeSaveBaseToFrameRecordOffset(), llvm::AArch64FunctionInfo::getCalleeSavedStackSize(), llvm::MachineFunction::getInfo(), llvm::AArch64Subtarget::getInstrInfo(), llvm::AArch64Subtarget::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), MBB, MBBI, llvm::MachineInstrBuilder::setMIFlags(), TII, and TRI.

Referenced by llvm::AArch64FrameLowering::emitPrologue().

emitShadowCallStackEpilogue()

static void emitShadowCallStackEpilogue ( const TargetInstrInfo &  TII, MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI, const DebugLoc &  DL  )

static

Definition at line 1668 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::MCCFIInstruction::createRestore(), llvm::RegState::Define, DL, llvm::MachineInstr::FrameDestroy, llvm::MachineFunction::getInfo(), MBB, MBBI, llvm::AArch64FunctionInfo::needsAsyncDwarfUnwindInfo(), llvm::MachineInstrBuilder::setMIFlag(), llvm::MachineInstrBuilder::setMIFlags(), and TII.

Referenced by llvm::AArch64FrameLowering::emitEpilogue().

emitShadowCallStackPrologue()

static void emitShadowCallStackPrologue ( const TargetInstrInfo &  TII, MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI, const DebugLoc &  DL, bool  NeedsWinCFI, bool  NeedsUnwindInfo  )

static

Definition at line 1629 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::MCCFIInstruction::createEscape(), llvm::RegState::Define, DL, llvm::MachineInstr::FrameSetup, MBB, MBBI, llvm::MachineInstrBuilder::setMIFlag(), and TII.

Referenced by llvm::AArch64FrameLowering::emitPrologue().

emitVGSaveRestore()

MachineBasicBlock::iterator emitVGSaveRestore	(	MachineBasicBlock::iterator	II,
		const AArch64FrameLowering *	TFI
	)

Definition at line 4607 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), assert(), llvm::BuildMI(), llvm::MCCFIInstruction::createOffset(), llvm::MCCFIInstruction::createRestore(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetFrameLowering::getOffsetOfLocalArea(), llvm::MachineBasicBlock::getParent(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::AArch64FunctionInfo::getStreamingVGIdx(), llvm::MachineFunction::getSubtarget(), llvm::AArch64FunctionInfo::getVGIdx(), llvm::SMEAttrs::hasStreamingBody(), llvm::SMEAttrs::hasStreamingInterface(), II, MBB, MI, llvm::Offset, TII, and TRI.

Referenced by llvm::AArch64FrameLowering::processFunctionBeforeFrameIndicesReplaced().

estimateRSStackSizeLimit()

static unsigned estimateRSStackSizeLimit ( MachineFunction &  MF )

static

Look at each instruction that references stack frames and return the stack size limit beyond which some of these instructions will require a scratch register during their expansion later.

Definition at line 393 of file AArch64FrameLowering.cpp.

References llvm::AArch64FrameOffsetCannotUpdate, DefaultSafeSPDisplacement, llvm::isAArch64FrameOffsetLegal(), MBB, MI, and llvm::Offset.

Referenced by llvm::AArch64FrameLowering::determineCalleeSaves(), llvm::ARMFrameLowering::determineCalleeSaves(), and llvm::CSKYFrameLowering::determineCalleeSaves().

findFreePredicateReg()

unsigned findFreePredicateReg

(

BitVector &

SavedRegs

)

Definition at line 2947 of file AArch64FrameLowering.cpp.

References llvm::BitVector::test().

Referenced by llvm::AArch64FrameLowering::determineCalleeSaves().

findScratchNonCalleeSaveRegister()

static Register findScratchNonCalleeSaveRegister ( MachineBasicBlock *  MBB )

static

Definition at line 1063 of file AArch64FrameLowering.cpp.

References llvm::LivePhysRegs::available(), llvm::MachineFunction::front(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFunction(), getLiveRegsForEntryMBB(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getRegInfo(), llvm::AArch64Subtarget::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), MBB, MRI, llvm::CallingConv::PreserveNone, and TRI.

Referenced by buildScratchExecCopy(), llvm::AArch64FrameLowering::canUseAsPrologue(), llvm::SIFrameLowering::emitEpilogue(), llvm::SIFrameLowering::emitPrologue(), and llvm::AArch64FrameLowering::spillCalleeSavedRegisters().

fixupCalleeSaveRestoreStackOffset()

static void fixupCalleeSaveRestoreStackOffset ( MachineInstr &  MI, uint64_t  LocalStackSize, bool  NeedsWinCFI, bool *  HasWinCFI  )

static

Definition at line 1559 of file AArch64FrameLowering.cpp.

References assert(), fixupSEHOpcode(), llvm::MachineOperand::getImm(), llvm::AArch64InstrInfo::isSEHInstruction(), llvm_unreachable, MBBI, MI, and llvm::MachineOperand::setImm().

Referenced by llvm::AArch64FrameLowering::emitEpilogue(), and llvm::AArch64FrameLowering::emitPrologue().

fixupSEHOpcode()

static void fixupSEHOpcode ( MachineBasicBlock::iterator  MBBI, unsigned  LocalStackSize  )

static

Definition at line 1370 of file AArch64FrameLowering.cpp.

References llvm::MachineOperand::getImm(), llvm_unreachable, MBBI, and llvm::MachineOperand::setImm().

Referenced by fixupCalleeSaveRestoreStackOffset().

getArgumentStackToRestore()

static int64_t getArgumentStackToRestore ( MachineFunction &  MF, MachineBasicBlock &  MBB  )

static

Returns how much of the incoming argument stack area (in bytes) we should clean up in an epilogue.

For the C calling convention this will be 0, for guaranteed tail call conventions it can be positive (a normal return or a tail call to a function that uses less stack space for arguments) or negative (for a tail call to a function that needs more stack space than us for arguments).

Definition at line 296 of file AArch64FrameLowering.cpp.

References llvm::MachineBasicBlock::end(), llvm::AArch64FunctionInfo::getArgumentStackToRestore(), llvm::MachineOperand::getImm(), llvm::MachineFunction::getInfo(), llvm::MachineBasicBlock::getLastNonDebugInstr(), llvm::AArch64InstrInfo::isTailCallReturnInst(), MBB, and MBBI.

Referenced by llvm::AArch64FrameLowering::emitEpilogue(), and llvm::ARMFrameLowering::emitEpilogue().

getFixedObjectSize()

static unsigned getFixedObjectSize ( const MachineFunction &  MF, const AArch64FunctionInfo *  AFI, bool  IsWin64, bool  IsFunclet  )

static

Returns the size of the fixed object area (allocated next to sp on entry) On Win64 this may include a var args area and an UnwindHelp object for EH.

Definition at line 425 of file AArch64FrameLowering.cpp.

References llvm::alignTo(), llvm::Function::getAttributes(), llvm::MachineFunction::getFunction(), llvm::AArch64FunctionInfo::getTailCallReservedStack(), llvm::AArch64FunctionInfo::getVarArgsGPRSize(), llvm::AttributeList::hasAttrSomewhere(), llvm::MachineFunction::hasEHFunclets(), and llvm::report_fatal_error().

Referenced by llvm::AArch64FrameLowering::emitEpilogue(), llvm::AArch64FrameLowering::emitPrologue(), getFPOffset(), and llvm::AArch64FrameLowering::processFunctionBeforeFrameFinalized().

getFPOffset()

static StackOffset getFPOffset ( const MachineFunction &  MF, int64_t  ObjectOffset  )

static

Definition at line 2671 of file AArch64FrameLowering.cpp.

References F, llvm::AArch64FunctionInfo::getCalleeSaveBaseToFrameRecordOffset(), llvm::AArch64FunctionInfo::getCalleeSavedStackSize(), llvm::StackOffset::getFixed(), getFixedObjectSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), and llvm::MachineFunction::getSubtarget().

Referenced by llvm::AArch64FrameLowering::getSEHFrameIndexOffset(), and llvm::AArch64FrameLowering::resolveFrameOffsetReference().

getLdStFrameID()

static std::optional< int > getLdStFrameID ( const MachineInstr &  MI, const MachineFrameInfo &  MFI  )

static

Definition at line 3577 of file AArch64FrameLowering.cpp.

References getMMOFrameID(), and MI.

Referenced by llvm::AArch64FrameLowering::orderFrameObjects().

getLivePhysRegsUpTo()

static void getLivePhysRegsUpTo ( MachineInstr &  MI, const TargetRegisterInfo &  TRI, LivePhysRegs &  LiveRegs  )

static

Collect live registers from the end of MI's parent up to (including) MI in LiveRegs.

Definition at line 1714 of file AArch64FrameLowering.cpp.

References llvm::LivePhysRegs::addLiveOuts(), llvm::MachineBasicBlock::instr_end(), llvm::make_range(), MBB, MI, llvm::reverse(), and llvm::LivePhysRegs::stepBackward().

Referenced by llvm::AArch64FrameLowering::emitPrologue().

getLiveRegsForEntryMBB()

static void getLiveRegsForEntryMBB ( LivePhysRegs &  LiveRegs, const MachineBasicBlock &  MBB  )

static

Definition at line 1042 of file AArch64FrameLowering.cpp.

References llvm::LivePhysRegs::addLiveIns(), llvm::LivePhysRegs::addReg(), llvm::MachineRegisterInfo::getCalleeSavedRegs(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getRegInfo(), and MBB.

Referenced by llvm::AArch64FrameLowering::canUseAsPrologue(), and findScratchNonCalleeSaveRegister().

getMMOFrameID()

static std::optional< int > getMMOFrameID ( MachineMemOperand *  MMO, const MachineFrameInfo &  MFI  )

static

Definition at line 3557 of file AArch64FrameLowering.cpp.

References llvm::MachineFrameInfo::getObjectAllocation(), llvm::MachineFrameInfo::getObjectIndexBegin(), llvm::MachineFrameInfo::getObjectIndexEnd(), llvm::MachineMemOperand::getPseudoValue(), llvm::getUnderlyingObject(), and llvm::MachineMemOperand::getValue().

Referenced by getLdStFrameID().

getPrologueDeath()

static unsigned getPrologueDeath ( MachineFunction &  MF, unsigned  Reg  )

static

Definition at line 2847 of file AArch64FrameLowering.cpp.

References llvm::getKillRegState(), llvm::MachineFunction::getRegInfo(), and llvm::MachineRegisterInfo::isLiveIn().

Referenced by llvm::AArch64FrameLowering::spillCalleeSavedRegisters().

getRegisterOrZero()

static MCRegister getRegisterOrZero ( MCRegister  Reg, bool  HasSVE  )

static

Definition at line 914 of file AArch64FrameLowering.cpp.

References CASE.

getStackOffset()

static StackOffset getStackOffset ( const MachineFunction &  MF, int64_t  ObjectOffset  )

static

Definition at line 2685 of file AArch64FrameLowering.cpp.

References llvm::StackOffset::getFixed(), and llvm::MachineFunction::getFrameInfo().

Referenced by llvm::AArch64FrameLowering::getFrameIndexReferencePreferSP(), llvm::AArch64FrameLowering::getSEHFrameIndexOffset(), and llvm::AArch64FrameLowering::resolveFrameOffsetReference().

getSVECalleeSaveSlotRange()

static bool getSVECalleeSaveSlotRange ( const MachineFrameInfo &  MFI, int &  Min, int &  Max  )

static

returns true if there are any SVE callee saves.

Definition at line 4026 of file AArch64FrameLowering.cpp.

References assert(), contains(), llvm::MachineFrameInfo::getCalleeSavedInfo(), and llvm::MachineFrameInfo::isCalleeSavedInfoValid().

Referenced by determineSVEStackObjectOffsets().

getSVEStackSize()

static StackOffset getSVEStackSize ( const MachineFunction &  MF )

static

Returns the size of the entire SVE stackframe (calleesaves + spills).

Definition at line 445 of file AArch64FrameLowering.cpp.

References llvm::MachineFunction::getInfo(), llvm::StackOffset::getScalable(), and llvm::AArch64FunctionInfo::getStackSizeSVE().

Referenced by llvm::AArch64FrameLowering::canUseRedZone(), llvm::AArch64FrameLowering::emitEpilogue(), llvm::AArch64FrameLowering::emitPrologue(), llvm::AArch64FrameLowering::getFrameIndexReferenceFromSP(), and llvm::AArch64FrameLowering::resolveFrameOffsetReference().

insertCFISameValue()

static void insertCFISameValue ( const MCInstrDesc &  Desc, MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  InsertPt, unsigned  DwarfReg  )

static

Definition at line 670 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), llvm::MCCFIInstruction::createSameValue(), and MBB.

Referenced by llvm::AArch64FrameLowering::resetCFIToInitialState().

InsertSEH()

static MachineBasicBlock::iterator InsertSEH ( MachineBasicBlock::iterator  MBBI, const TargetInstrInfo &  TII, MachineInstr::MIFlag  Flag  )

static

Definition at line 1226 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::BuildMI(), DL, llvm::MachineBasicBlock::getParent(), llvm::AArch64Subtarget::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), I, llvm::MachineBasicBlock::insertAfter(), llvm_unreachable, MBB, MBBI, llvm::MachineInstrBuilder::setMIFlag(), and TII.

Referenced by convertCalleeSaveRestoreToSPPrePostIncDec(), llvm::AArch64FrameLowering::restoreCalleeSavedRegisters(), and llvm::AArch64FrameLowering::spillCalleeSavedRegisters().

invalidateRegisterPairing()

static bool invalidateRegisterPairing ( unsigned  Reg1, unsigned  Reg2, bool  UsesWinAAPCS, bool  NeedsWinCFI, bool  NeedsFrameRecord, bool  IsFirst, const TargetRegisterInfo *  TRI  )

static

Returns true if Reg1 and Reg2 cannot be paired using a ldp/stp instruction.

WindowsCFI requires that only consecutive registers can be paired. LR and FP need to be allocated together when the frame needs to save the frame-record. This means any other register pairing with LR is invalid.

Definition at line 2898 of file AArch64FrameLowering.cpp.

References invalidateWindowsRegisterPairing(), and TRI.

Referenced by computeCalleeSaveRegisterPairs().

invalidateWindowsRegisterPairing()

static bool invalidateWindowsRegisterPairing ( unsigned  Reg1, unsigned  Reg2, bool  NeedsWinCFI, bool  IsFirst, const TargetRegisterInfo *  TRI  )

static

Definition at line 2867 of file AArch64FrameLowering.cpp.

References TRI.

Referenced by computeCalleeSaveRegisterPairs(), and invalidateRegisterPairing().

isFuncletReturnInstr()

static bool isFuncletReturnInstr ( const MachineInstr &  MI )

static

Definition at line 2259 of file AArch64FrameLowering.cpp.

References MI.

Referenced by llvm::X86RegisterInfo::eliminateFrameIndex(), llvm::AArch64FrameLowering::emitEpilogue(), llvm::X86FrameLowering::emitEpilogue(), and llvm::X86FrameLowering::restoreCalleeSavedRegisters().

IsSVECalleeSave()

static bool IsSVECalleeSave ( MachineBasicBlock::iterator  I )

static

Definition at line 1613 of file AArch64FrameLowering.cpp.

References llvm::MachineInstr::FrameDestroy, llvm::MachineInstr::FrameSetup, and I.

Referenced by llvm::AArch64FrameLowering::emitEpilogue(), and llvm::AArch64FrameLowering::emitPrologue().

isTargetWindows()

static bool isTargetWindows ( const MachineFunction &  MF )

static

Definition at line 1608 of file AArch64FrameLowering.cpp.

References llvm::MachineFunction::getSubtarget(), and isTargetWindows().

Referenced by llvm::AArch64FrameLowering::assignCalleeSavedSpillSlots(), computeCalleeSaveRegisterPairs(), and isTargetWindows().

isVGInstruction()

bool isVGInstruction

(

MachineBasicBlock::iterator

MBBI

)

Definition at line 1409 of file AArch64FrameLowering.cpp.

References MBBI, and requiresGetVGCall().

Referenced by convertCalleeSaveRestoreToSPPrePostIncDec(), and llvm::AArch64FrameLowering::emitPrologue().

needsWinCFI()

static bool needsWinCFI ( const MachineFunction &  MF )

static

Definition at line 1136 of file AArch64FrameLowering.cpp.

References F, llvm::MachineFunction::getFunction(), llvm::TargetMachine::getMCAsmInfo(), llvm::MachineFunction::getTarget(), and llvm::MCAsmInfo::usesWindowsCFI().

Referenced by llvm::AArch64FrameLowering::assignCalleeSavedSpillSlots(), computeCalleeSaveRegisterPairs(), llvm::AArch64FrameLowering::emitEpilogue(), llvm::AArch64FrameLowering::emitPrologue(), llvm::ARMFrameLowering::emitPrologue(), llvm::AArch64FrameLowering::restoreCalleeSavedRegisters(), and llvm::AArch64FrameLowering::spillCalleeSavedRegisters().

operator<<()

static raw_ostream & operator<< ( raw_ostream &  OS, const StackAccess &  SA  )

inlinestatic

Definition at line 5117 of file AArch64FrameLowering.cpp.

References OS, and StackAccess::print().

produceCompactUnwindFrame()

static bool produceCompactUnwindFrame ( MachineFunction &  MF )

static

Definition at line 2857 of file AArch64FrameLowering.cpp.

References llvm::Function::getAttributes(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getSubtarget(), llvm::AArch64Subtarget::getTargetLowering(), llvm::AArch64Subtarget::isTargetMachO(), requiresSaveVG(), llvm::AArch64TargetLowering::supportSwiftError(), and llvm::CallingConv::SwiftTail.

Referenced by computeCalleeSaveRegisterPairs(), and llvm::AArch64FrameLowering::determineCalleeSaves().

requiresGetVGCall()

bool requiresGetVGCall

(

MachineFunction &

MF

)

Definition at line 1391 of file AArch64FrameLowering.cpp.

References llvm::MachineFunction::getInfo(), llvm::MachineFunction::getSubtarget(), and llvm::AArch64FunctionInfo::hasStreamingModeChanges().

Referenced by llvm::AArch64FrameLowering::emitPrologue(), and isVGInstruction().

requiresSaveVG()

static bool requiresSaveVG ( MachineFunction &  MF )

static

Definition at line 1397 of file AArch64FrameLowering.cpp.

References llvm::MachineFunction::getInfo(), llvm::MachineFunction::getSubtarget(), and llvm::AArch64FunctionInfo::hasStreamingModeChanges().

Referenced by llvm::AArch64FrameLowering::assignCalleeSavedSpillSlots(), convertCalleeSaveRestoreToSPPrePostIncDec(), llvm::AArch64FrameLowering::determineCalleeSaves(), llvm::AArch64FrameLowering::emitPrologue(), llvm::AArch64FrameLowering::processFunctionBeforeFrameIndicesReplaced(), and produceCompactUnwindFrame().

STATISTIC()

STATISTIC	(	NumRedZoneFunctions	,
		"Number of functions using red zone"
	)

upperBound()

static int64_t upperBound ( StackOffset  Size )

static

Definition at line 769 of file AArch64FrameLowering.cpp.

References Size.

windowsRequiresStackProbe()

static bool windowsRequiresStackProbe ( MachineFunction &  MF, uint64_t  StackSizeInBytes  )

static

Definition at line 1126 of file AArch64FrameLowering.cpp.

References llvm::MachineFunction::getInfo(), llvm::MachineFunction::getSubtarget(), and llvm::AArch64Subtarget::isTargetWindows().

Referenced by llvm::AArch64FrameLowering::determineCalleeSaves(), and llvm::AArch64FrameLowering::emitPrologue().

Variable Documentation

DefaultSafeSPDisplacement

const unsigned DefaultSafeSPDisplacement = 255

static

This is the biggest offset to the stack pointer we can encode in aarch64 instructions (without using a separate calculation and a temp register).

Note that the exception here are vector stores/loads which cannot encode any displacements (see estimateRSStackSizeLimit(), isAArch64FrameOffsetLegal()).

Definition at line 388 of file AArch64FrameLowering.cpp.

Referenced by estimateRSStackSizeLimit(), and llvm::AArch64FrameLowering::hasFP().

EnableHomogeneousPrologEpilog

cl::opt< bool > EnableHomogeneousPrologEpilog("homogeneous-prolog-epilog", cl::Hidden, cl::desc("Emit homogeneous prologue and epilogue for the size " "optimization (default = off)"))	(	"homogeneous-prolog-epilog"	,
		cl::Hidden	,
		cl::desc("Emit homogeneous prologue and epilogue for the size " "optimization (default = off)")
	)

EnableRedZone

cl::opt< bool > EnableRedZone("aarch64-redzone", cl::desc("enable use of redzone on AArch64"), cl::init(false), cl::Hidden) ( "aarch64-redzone"  , cl::desc("enable use of redzone on AArch64")  , cl::init(false)  , cl::Hidden    )

static

Referenced by llvm::AArch64FrameLowering::canUseRedZone().

OrderFrameObjects

cl::opt< bool > OrderFrameObjects("aarch64-order-frame-objects", cl::desc("sort stack allocations"), cl::init(true), cl::Hidden) ( "aarch64-order-frame-objects"  , cl::desc("sort stack allocations")  , cl::init(true)  , cl::Hidden    )

static

Referenced by llvm::AArch64FrameLowering::orderFrameObjects().

StackHazardInNonStreaming

cl::opt< bool > StackHazardInNonStreaming("aarch64-stack-hazard-in-non-streaming", cl::init(false), cl::Hidden) ( "aarch64-stack-hazard-in-non-streaming"  , cl::init(false)  , cl::Hidden    )

static

StackHazardRemarkSize

cl::opt< unsigned > StackHazardRemarkSize("aarch64-stack-hazard-remark-size", cl::init(0), cl::Hidden) ( "aarch64-stack-hazard-remark-size"  , cl::init(0)  , cl::Hidden    )

static

StackHazardSize

cl::opt< unsigned > StackHazardSize("aarch64-stack-hazard-size", cl::init(0), cl::Hidden) ( "aarch64-stack-hazard-size"  , cl::init(0)  , cl::Hidden    )

static

Referenced by llvm::AArch64FrameLowering::assignCalleeSavedSpillSlots(), computeCalleeSaveRegisterPairs(), and llvm::AArch64FrameLowering::determineCalleeSaves().

StackTaggingMergeSetTag

cl::opt< bool > StackTaggingMergeSetTag("stack-tagging-merge-settag", cl::desc("merge settag instruction in function epilog"), cl::init(true), cl::Hidden) ( "stack-tagging-merge-settag"  , cl::desc("merge settag instruction in function epilog")  , cl::init(true)  , cl::Hidden    )

static

Referenced by llvm::AArch64FrameLowering::processFunctionBeforeFrameIndicesReplaced().