llvm::X86FrameLowering Class Reference

#include "Target/X86/X86FrameLowering.h"

Inheritance diagram for llvm::X86FrameLowering:

Public Member Functions
	X86FrameLowering (const X86Subtarget &STI, MaybeAlign StackAlignOverride)
void	emitStackProbe (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL, bool InProlog, std::optional< MachineFunction::DebugInstrOperandPair > InstrNum=std::nullopt) const
	Emit target stack probe code.
bool	stackProbeFunctionModifiesSP () const override
	Does the stack probe function call return with a modified stack pointer?
void	inlineStackProbe (MachineFunction &MF, MachineBasicBlock &PrologMBB) const override
	Replace a StackProbe inline-stub with the actual probe code inline.
void	emitCalleeSavedFrameMovesFullCFA (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI) const override
	Emits Dwarf Info specifying offsets of callee saved registers and frame pointer.
void	emitCalleeSavedFrameMoves (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL, bool IsPrologue) const
void	emitPrologue (MachineFunction &MF, MachineBasicBlock &MBB) const override
	emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.
void	emitEpilogue (MachineFunction &MF, MachineBasicBlock &MBB) const override
void	adjustForSegmentedStacks (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const override
	Adjust the prologue to have the function use segmented stacks.
void	adjustForHiPEPrologue (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const override
	Erlang programs may need a special prologue to handle the stack size they might need at runtime.
void	determineCalleeSaves (MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS=nullptr) const override
	This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved.
bool	assignCalleeSavedSpillSlots (MachineFunction &MF, const TargetRegisterInfo *TRI, std::vector< CalleeSavedInfo > &CSI) const override
bool	spillCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, ArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI) const override
	spillCalleeSavedRegisters - Issues instruction(s) to spill all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of store instructions via storeRegToStackSlot().
bool	restoreCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, MutableArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI) const override
	restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of load instructions via loadRegToStackSlot().
void	spillFPBP (MachineFunction &MF) const override
	If a function uses base pointer and the base pointer is clobbered by inline asm, RA doesn't detect this case, and after the inline asm, the base pointer contains garbage value.
bool	hasFP (const MachineFunction &MF) const override
	hasFP - Return true if the specified function should have a dedicated frame pointer register.
bool	hasReservedCallFrame (const MachineFunction &MF) const override
	hasReservedCallFrame - Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function.
bool	canSimplifyCallFramePseudos (const MachineFunction &MF) const override
	canSimplifyCallFramePseudos - If there is a reserved call frame, the call frame pseudos can be simplified.
bool	needsFrameIndexResolution (const MachineFunction &MF) const override
StackOffset	getFrameIndexReference (const MachineFunction &MF, int FI, Register &FrameReg) const override
	getFrameIndexReference - This method should return the base register and offset used to reference a frame index location.
int	getWin64EHFrameIndexRef (const MachineFunction &MF, int FI, Register &SPReg) const
StackOffset	getFrameIndexReferenceSP (const MachineFunction &MF, int FI, Register &SPReg, int Adjustment) const
StackOffset	getFrameIndexReferencePreferSP (const MachineFunction &MF, int FI, Register &FrameReg, bool IgnoreSPUpdates) const override
	Same as getFrameIndexReference, except that the stack pointer (as opposed to the frame pointer) will be the preferred value for FrameReg.
MachineBasicBlock::iterator	eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) const override
	This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy pseudo instructions (but only if the Target is using them).
unsigned	getWinEHParentFrameOffset (const MachineFunction &MF) const override
void	processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS) const override
	processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized.
void	processFunctionBeforeFrameIndicesReplaced (MachineFunction &MF, RegScavenger *RS) const override
	processFunctionBeforeFrameIndicesReplaced - This method is called immediately before MO_FrameIndex operands are eliminated, but after the frame is finalized.
int	mergeSPUpdates (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, bool doMergeWithPrevious) const
	Check the instruction before/after the passed instruction.
void	emitSPUpdate (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, const DebugLoc &DL, int64_t NumBytes, bool InEpilogue) const
	Emit a series of instructions to increment / decrement the stack pointer by a constant value.
bool	canUseLEAForSPInEpilogue (const MachineFunction &MF) const
	Check that LEA can be used on SP in an epilogue sequence for MF.
bool	canUseAsPrologue (const MachineBasicBlock &MBB) const override
	Check whether or not the given MBB can be used as a prologue for the target.
bool	canUseAsEpilogue (const MachineBasicBlock &MBB) const override
	Check whether or not the given MBB can be used as a epilogue for the target.
bool	enableShrinkWrapping (const MachineFunction &MF) const override
	Returns true if the target will correctly handle shrink wrapping.
void	orderFrameObjects (const MachineFunction &MF, SmallVectorImpl< int > &ObjectsToAllocate) const override
	Order the symbols in the local stack.
void	BuildCFI (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL, const MCCFIInstruction &CFIInst, MachineInstr::MIFlag Flag=MachineInstr::NoFlags) const
	Wraps up getting a CFI index and building a MachineInstr for it.
MachineBasicBlock::iterator	restoreWin32EHStackPointers (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL, bool RestoreSP=false) const
	Sets up EBP and optionally ESI based on the incoming EBP value.
void	restoreWinEHStackPointersInParent (MachineFunction &MF) const
int	getInitialCFAOffset (const MachineFunction &MF) const override
	Return initial CFA offset value i.e.
Register	getInitialCFARegister (const MachineFunction &MF) const override
	Return initial CFA register value i.e.
DwarfFrameBase	getDwarfFrameBase (const MachineFunction &MF) const override
	Return the frame base information to be encoded in the DWARF subprogram debug info.
bool	has128ByteRedZone (const MachineFunction &MF) const
	Return true if the function has a redzone (accessible bytes past the frame of the top of stack function) as part of it's ABI.
Public Member Functions inherited from llvm::TargetFrameLowering
	TargetFrameLowering (StackDirection D, Align StackAl, int LAO, Align TransAl=Align(1), bool StackReal=true)
virtual	~TargetFrameLowering ()
StackDirection	getStackGrowthDirection () const
	getStackGrowthDirection - Return the direction the stack grows
unsigned	getStackAlignment () const
	getStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned on entry to a function.
Align	getStackAlign () const
	getStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned on entry to a function.
virtual uint64_t	getStackThreshold () const
	getStackThreshold - Return the maximum stack size
int	alignSPAdjust (int SPAdj) const
	alignSPAdjust - This method aligns the stack adjustment to the correct alignment.
Align	getTransientStackAlign () const
	getTransientStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned at all times, even between calls.
bool	isStackRealignable () const
	isStackRealignable - This method returns whether the stack can be realigned.
virtual bool	isStackIdSafeForLocalArea (unsigned StackId) const
	This method returns whether or not it is safe for an object with the given stack id to be bundled into the local area.
int	getOffsetOfLocalArea () const
	getOffsetOfLocalArea - This method returns the offset of the local area from the stack pointer on entrance to a function.
virtual bool	allocateScavengingFrameIndexesNearIncomingSP (const MachineFunction &MF) const
	Control the placement of special register scavenging spill slots when allocating a stack frame.
virtual bool	assignCalleeSavedSpillSlots (MachineFunction &MF, const TargetRegisterInfo *TRI, std::vector< CalleeSavedInfo > &CSI, unsigned &MinCSFrameIndex, unsigned &MaxCSFrameIndex) const
	assignCalleeSavedSpillSlots - Allows target to override spill slot assignment logic.
virtual bool	assignCalleeSavedSpillSlots (MachineFunction &MF, const TargetRegisterInfo *TRI, std::vector< CalleeSavedInfo > &CSI) const
virtual const SpillSlot *	getCalleeSavedSpillSlots (unsigned &NumEntries) const
	getCalleeSavedSpillSlots - This method returns a pointer to an array of pairs, that contains an entry for each callee saved register that must be spilled to a particular stack location if it is spilled.
virtual bool	targetHandlesStackFrameRounding () const
	targetHandlesStackFrameRounding - Returns true if the target is responsible for rounding up the stack frame (probably at emitPrologue time).
virtual bool	enableShrinkWrapping (const MachineFunction &MF) const
	Returns true if the target will correctly handle shrink wrapping.
virtual bool	enableStackSlotScavenging (const MachineFunction &MF) const
	Returns true if the stack slot holes in the fixed and callee-save stack area should be used when allocating other stack locations to reduce stack size.
virtual bool	enableCalleeSaveSkip (const MachineFunction &MF) const
	Returns true if the target can safely skip saving callee-saved registers for noreturn nounwind functions.
virtual void	emitPrologue (MachineFunction &MF, MachineBasicBlock &MBB) const =0
	emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.
virtual void	emitEpilogue (MachineFunction &MF, MachineBasicBlock &MBB) const =0
virtual void	emitZeroCallUsedRegs (BitVector RegsToZero, MachineBasicBlock &MBB) const
	emitZeroCallUsedRegs - Zeros out call used registers.
virtual void	emitCalleeSavedFrameMovesFullCFA (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI) const
	With basic block sections, emit callee saved frame moves for basic blocks that are in a different section.
virtual bool	enableCFIFixup (MachineFunction &MF) const
	Returns true if we may need to fix the unwind information for the function.
virtual void	resetCFIToInitialState (MachineBasicBlock &MBB) const
	Emit CFI instructions that recreate the state of the unwind information upon fucntion entry.
virtual void	inlineStackProbe (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
	Replace a StackProbe stub (if any) with the actual probe code inline.
virtual bool	stackProbeFunctionModifiesSP () const
	Does the stack probe function call return with a modified stack pointer?
virtual void	adjustForSegmentedStacks (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
	Adjust the prologue to have the function use segmented stacks.
virtual void	adjustForHiPEPrologue (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
	Adjust the prologue to add Erlang Run-Time System (ERTS) specific code in the assembly prologue to explicitly handle the stack.
virtual bool	spillCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, ArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI) const
	spillCalleeSavedRegisters - Issues instruction(s) to spill all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of store instructions via storeRegToStackSlot().
virtual bool	restoreCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, MutableArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI) const
	restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of load instructions via loadRegToStackSlot().
virtual bool	keepFramePointer (const MachineFunction &MF) const
	Return true if the target wants to keep the frame pointer regardless of the function attribute "frame-pointer".
virtual bool	hasFP (const MachineFunction &MF) const =0
	hasFP - Return true if the specified function should have a dedicated frame pointer register.
virtual bool	hasReservedCallFrame (const MachineFunction &MF) const
	hasReservedCallFrame - Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function.
virtual bool	canSimplifyCallFramePseudos (const MachineFunction &MF) const
	canSimplifyCallFramePseudos - When possible, it's best to simplify the call frame pseudo ops before doing frame index elimination.
virtual bool	needsFrameIndexResolution (const MachineFunction &MF) const
virtual StackOffset	getFrameIndexReference (const MachineFunction &MF, int FI, Register &FrameReg) const
	getFrameIndexReference - This method should return the base register and offset used to reference a frame index location.
virtual StackOffset	getFrameIndexReferencePreferSP (const MachineFunction &MF, int FI, Register &FrameReg, bool IgnoreSPUpdates) const
	Same as getFrameIndexReference, except that the stack pointer (as opposed to the frame pointer) will be the preferred value for FrameReg.
virtual StackOffset	getNonLocalFrameIndexReference (const MachineFunction &MF, int FI) const
	getNonLocalFrameIndexReference - This method returns the offset used to reference a frame index location.
virtual StackOffset	getFrameIndexReferenceFromSP (const MachineFunction &MF, int FI) const
	getFrameIndexReferenceFromSP - This method returns the offset from the stack pointer to the slot of the specified index.
virtual void	getCalleeSaves (const MachineFunction &MF, BitVector &SavedRegs) const
	Returns the callee-saved registers as computed by determineCalleeSaves in the BitVector SavedRegs.
virtual void	determineCalleeSaves (MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS=nullptr) const
	This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved.
virtual void	processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS=nullptr) const
	processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized.
virtual void	processFunctionBeforeFrameIndicesReplaced (MachineFunction &MF, RegScavenger *RS=nullptr) const
	processFunctionBeforeFrameIndicesReplaced - This method is called immediately before MO_FrameIndex operands are eliminated, but after the frame is finalized.
virtual unsigned	getWinEHParentFrameOffset (const MachineFunction &MF) const
virtual MachineBasicBlock::iterator	eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) const
	This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy pseudo instructions (but only if the Target is using them).
virtual void	orderFrameObjects (const MachineFunction &MF, SmallVectorImpl< int > &objectsToAllocate) const
	Order the symbols in the local stack frame.
virtual bool	canUseAsPrologue (const MachineBasicBlock &MBB) const
	Check whether or not the given MBB can be used as a prologue for the target.
virtual bool	canUseAsEpilogue (const MachineBasicBlock &MBB) const
	Check whether or not the given MBB can be used as a epilogue for the target.
virtual TargetStackID::Value	getStackIDForScalableVectors () const
	Returns the StackID that scalable vectors should be associated with.
virtual bool	isSupportedStackID (TargetStackID::Value ID) const
virtual bool	isProfitableForNoCSROpt (const Function &F) const
	Check if the no-CSR optimisation is profitable for the given function.
virtual int	getInitialCFAOffset (const MachineFunction &MF) const
	Return initial CFA offset value i.e.
virtual Register	getInitialCFARegister (const MachineFunction &MF) const
	Return initial CFA register value i.e.
virtual DwarfFrameBase	getDwarfFrameBase (const MachineFunction &MF) const
	Return the frame base information to be encoded in the DWARF subprogram debug info.
virtual void	spillFPBP (MachineFunction &MF) const
	If frame pointer or base pointer is clobbered by an instruction, we should spill/restore it around that instruction.
virtual void	emitRemarks (const MachineFunction &MF, MachineOptimizationRemarkEmitter *ORE) const
	This method is called at the end of prolog/epilog code insertion, so targets can emit remarks based on the final frame layout.

Public Attributes
const X86Subtarget &	STI
const X86InstrInfo &	TII
const X86RegisterInfo *	TRI
unsigned	SlotSize
bool	Is64Bit
	Is64Bit implies that x86_64 instructions are available.
bool	IsLP64
bool	Uses64BitFramePtr
	True if the 64-bit frame or stack pointer should be used.
unsigned	StackPtr

Additional Inherited Members
Public Types inherited from llvm::TargetFrameLowering
enum	StackDirection { StackGrowsUp , StackGrowsDown }
Static Public Member Functions inherited from llvm::TargetFrameLowering
static bool	isSafeForNoCSROpt (const Function &F)
	Check if given function is safe for not having callee saved registers.

Detailed Description

Definition at line 28 of file X86FrameLowering.h.

Constructor & Destructor Documentation

X86FrameLowering()

X86FrameLowering::X86FrameLowering	(	const X86Subtarget &	STI,
		MaybeAlign	StackAlignOverride
	)

Definition at line 50 of file X86FrameLowering.cpp.

References llvm::X86RegisterInfo::getSlotSize(), llvm::X86RegisterInfo::getStackRegister(), Is64Bit, IsLP64, llvm::X86Subtarget::isTarget64BitLP64(), llvm::X86Subtarget::isTargetNaCl64(), SlotSize, StackPtr, STI, TRI, and Uses64BitFramePtr.

Member Function Documentation

adjustForHiPEPrologue()

void X86FrameLowering::adjustForHiPEPrologue ( MachineFunction &  MF, MachineBasicBlock &  PrologueMBB  ) const

overridevirtual

Erlang programs may need a special prologue to handle the stack size they might need at runtime.

That is because Erlang/OTP does not implement a C stack but uses a custom implementation of hybrid stack/heap architecture. (for more information see Eric Stenman's Ph.D. thesis: http://publications.uu.se/uu/fulltext/nbn_se_uu_diva-2688.pdf)

CheckStack: temp0 = sp - MaxStack if( temp0 < SP_LIMIT(P) ) goto IncStack else goto OldStart OldStart: ... IncStack: call inc_stack # doubles the stack space temp0 = sp - MaxStack if( temp0 < SP_LIMIT(P) ) goto IncStack else goto OldStart

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3513 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addExternalSymbol(), llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addMBB(), llvm::MachineInstrBuilder::addReg(), llvm::addRegOffset(), llvm::MachineBasicBlock::addSuccessor(), llvm::Function::arg_size(), assert(), llvm::MachineFunction::begin(), llvm::BuildMI(), llvm::X86::COND_AE, llvm::X86::COND_LE, llvm::MachineFunction::CreateMachineBasicBlock(), DL, F, llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineOperand::getGlobal(), getHiPELiteral(), llvm::Module::getNamedMetadata(), llvm::GlobalValue::getParent(), llvm::MachineFunction::getRegInfo(), GetScratchRegister(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFrameInfo::hasCalls(), Is64Bit, llvm::MachineOperand::isGlobal(), llvm::MachineRegisterInfo::isLiveIn(), IsLP64, llvm::X86Subtarget::isTargetLinux(), llvm::MachineBasicBlock::liveins(), MBB, MI, llvm::StringRef::npos, llvm::MachineFunction::push_front(), llvm::report_fatal_error(), SlotSize, STI, TII, and llvm::MachineFunction::verify().

adjustForSegmentedStacks()

void X86FrameLowering::adjustForSegmentedStacks ( MachineFunction &  MF, MachineBasicBlock &  PrologueMBB  ) const

overridevirtual

Adjust the prologue to have the function use segmented stacks.

This works by adding a check even before the "normal" function prologue.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3205 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addExternalSymbol(), llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addMBB(), llvm::MachineInstrBuilder::addReg(), llvm::MachineBasicBlock::addSuccessor(), assert(), llvm::MachineFunction::begin(), llvm::BuildMI(), llvm::X86::COND_A, llvm::MachineFunction::CreateMachineBasicBlock(), DL, llvm::X86MachineFunctionInfo::getArgumentStackSize(), llvm::TargetMachine::getCodeModel(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), getMOVriOpcode(), llvm::BranchProbability::getOne(), llvm::MachineFunction::getRegInfo(), GetScratchRegister(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getTarget(), llvm::BranchProbability::getZero(), HasNestArgument(), Is64Bit, llvm::MachineRegisterInfo::isLiveIn(), IsLP64, llvm::X86Subtarget::isTargetDarwin(), llvm::X86Subtarget::isTargetDragonFly(), llvm::X86Subtarget::isTargetFreeBSD(), llvm::X86Subtarget::isTargetLinux(), llvm::X86Subtarget::isTargetWin32(), llvm::X86Subtarget::isTargetWin64(), llvm::Function::isVarArg(), llvm::RegState::Kill, kSplitStackAvailable, llvm::CodeModel::Large, llvm::MachineBasicBlock::liveins(), llvm::MachineFrameInfo::needsSplitStackProlog(), llvm::MachineFunction::push_front(), llvm::report_fatal_error(), STI, TII, llvm::X86Subtarget::useIndirectThunkCalls(), and llvm::MachineFunction::verify().

assignCalleeSavedSpillSlots()

bool X86FrameLowering::assignCalleeSavedSpillSlots ( MachineFunction &  MF, const TargetRegisterInfo *  TRI, std::vector< CalleeSavedInfo > &  CSI  ) const

overridevirtual

Reimplemented from llvm::TargetFrameLowering.

Definition at line 2791 of file X86FrameLowering.cpp.

References llvm::X86MachineFunctionInfo::addCandidateForPush2Pop2(), llvm::alignDown(), llvm::alignTo(), assert(), contains(), llvm::count_if(), llvm::MachineFrameInfo::CreateFixedObject(), llvm::MachineFrameInfo::CreateFixedSpillStackObject(), llvm::MachineFrameInfo::CreateSpillStackObject(), llvm::MachineFrameInfo::ensureMaxAlignment(), llvm::MachineFunction::getFrameInfo(), llvm::X86RegisterInfo::getFrameRegister(), llvm::MachineFunction::getInfo(), llvm::X86MachineFunctionInfo::getNumCandidatesForPush2Pop2(), llvm::TargetFrameLowering::getOffsetOfLocalArea(), llvm::X86MachineFunctionInfo::getRestoreBasePointer(), llvm::X86MachineFunctionInfo::getTCReturnAddrDelta(), llvm::X86MachineFunctionInfo::getWinEHXMMSlotInfo(), llvm::MachineFunction::hasEHFunclets(), hasFP(), llvm::X86MachineFunctionInfo::hasSwiftAsyncContext(), I, llvm::X86MachineFunctionInfo::padForPush2Pop2(), llvm::reverse(), llvm::X86MachineFunctionInfo::setCalleeSavedFrameSize(), llvm::MachineFrameInfo::setCVBytesOfCalleeSavedRegisters(), llvm::X86MachineFunctionInfo::setHasSEHFramePtrSave(), llvm::X86MachineFunctionInfo::setPadForPush2Pop2(), llvm::X86MachineFunctionInfo::setRestoreBasePointer(), llvm::X86MachineFunctionInfo::setSEHFramePtrSaveIndex(), Size, SlotSize, STI, and TRI.

BuildCFI()

void X86FrameLowering::BuildCFI	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	DL,
		const MCCFIInstruction &	CFIInst,
		MachineInstr::MIFlag	Flag = MachineInstr::NoFlags
	)		const

Wraps up getting a CFI index and building a MachineInstr for it.

Definition at line 445 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::BuildMI(), DL, llvm::MachineFunction::getInfo(), llvm::MCCFIInstruction::getOperation(), llvm::MachineBasicBlock::getParent(), MBB, MBBI, llvm::MCCFIInstruction::OpAdjustCfaOffset, llvm::MachineInstrBuilder::setMIFlag(), and TII.

Referenced by eliminateCallFramePseudoInstr(), emitCalleeSavedFrameMoves(), emitCalleeSavedFrameMovesFullCFA(), emitEpilogue(), emitPrologue(), and ExpandMOVImmSExti8().

canSimplifyCallFramePseudos()

bool X86FrameLowering::canSimplifyCallFramePseudos ( const MachineFunction &  MF ) const

overridevirtual

canSimplifyCallFramePseudos - If there is a reserved call frame, the call frame pseudos can be simplified.

Having a FP, as in the default implementation, is not sufficient here since we can't always use it. Use a more nuanced condition.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 74 of file X86FrameLowering.cpp.

References llvm::MachineFunction::getInfo(), llvm::X86RegisterInfo::hasBasePointer(), hasFP(), hasReservedCallFrame(), and TRI.

canUseAsEpilogue()

bool X86FrameLowering::canUseAsEpilogue ( const MachineBasicBlock &  MBB ) const

overridevirtual

Check whether or not the given MBB can be used as a epilogue for the target.

The epilogue will be inserted before the first terminator of that block. This method is used by the shrink-wrapping pass to decide if MBB will be correctly handled by the target.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3853 of file X86FrameLowering.cpp.

References assert(), canUseLEAForSPInEpilogue(), flagsNeedToBePreservedBeforeTheTerminators(), llvm::MachineFunction::getInfo(), llvm::MachineBasicBlock::getParent(), llvm::X86MachineFunctionInfo::hasSwiftAsyncContext(), llvm::MachineBasicBlock::isReturnBlock(), llvm::X86Subtarget::isTargetWin64(), MBB, STI, and llvm::MachineBasicBlock::succ_empty().

canUseAsPrologue()

bool X86FrameLowering::canUseAsPrologue ( const MachineBasicBlock &  MBB ) const

overridevirtual

Check whether or not the given MBB can be used as a prologue for the target.

The prologue will be inserted first in this basic block. This method is used by the shrink-wrapping pass to decide if MBB will be correctly handled by the target. As soon as the target enable shrink-wrapping without overriding this method, we assume that each basic block is a valid prologue.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3836 of file X86FrameLowering.cpp.

References assert(), llvm::MachineFunction::getInfo(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getSubtarget(), llvm::X86Subtarget::getTargetLowering(), llvm::X86MachineFunctionInfo::hasSwiftAsyncContext(), llvm::MachineBasicBlock::isLiveIn(), MBB, STI, and TRI.

canUseLEAForSPInEpilogue()

bool X86FrameLowering::canUseLEAForSPInEpilogue

(

const MachineFunction &

MF

)

const

Check that LEA can be used on SP in an epilogue sequence for MF.

Definition at line 2260 of file X86FrameLowering.cpp.

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

Referenced by canUseAsEpilogue().

determineCalleeSaves()

void X86FrameLowering::determineCalleeSaves ( MachineFunction &  MF, BitVector &  SavedRegs, RegScavenger *  RS = nullptr  ) const

overridevirtual

This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved.

The default implementation checks populates the SavedRegs bitset with all registers which are modified in the function, targets may override this function to save additional registers. This method also sets up the register scavenger ensuring there is a free register or a frameindex available. This method should not be called by any passes outside of PEI, because it may change state passed in by MF and RS. The preferred interface outside PEI is getCalleeSaves.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3139 of file X86FrameLowering.cpp.

References llvm::TargetFrameLowering::determineCalleeSaves(), llvm::X86RegisterInfo::getBaseRegister(), llvm::getX86SubSuperRegister(), llvm::X86RegisterInfo::hasBasePointer(), llvm::X86Subtarget::isTarget64BitILP32(), llvm::BitVector::set(), STI, and TRI.

eliminateCallFramePseudoInstr()

MachineBasicBlock::iterator X86FrameLowering::eliminateCallFramePseudoInstr ( MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MI  ) const

overridevirtual

This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy pseudo instructions (but only if the Target is using them).

It is responsible for eliminating these instructions, replacing them with concrete instructions. This method need only be implemented if using call frame setup/destroy pseudo instructions. Returns an iterator pointing to the instruction after the replaced one.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3726 of file X86FrameLowering.cpp.

References llvm::alignTo(), B, llvm::MachineBasicBlock::begin(), blockEndIsUnreachable(), BuildCFI(), llvm::MCCFIInstruction::createAdjustCfaOffset(), llvm::MCCFIInstruction::createGnuArgsSize(), DL, llvm::DwarfCFI, llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::erase(), F, llvm::X86InstrInfo::getFrameAdjustment(), llvm::MachineFunction::getFunction(), llvm::X86MachineFunctionInfo::getHasPushSequences(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getLandingPads(), llvm::TargetMachine::getMCAsmInfo(), llvm::TargetFrameLowering::getStackAlign(), llvm::MachineFunction::getTarget(), hasFP(), hasReservedCallFrame(), I, MBB, mergeSPUpdates(), llvm::MachineFunction::needsFrameMoves(), llvm::skipDebugInstructionsForward(), TII, and llvm::MCAsmInfo::usesWindowsCFI().

emitCalleeSavedFrameMoves()

void X86FrameLowering::emitCalleeSavedFrameMoves	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	DL,
		bool	IsPrologue
	)		const

Definition at line 483 of file X86FrameLowering.cpp.

References llvm::SmallString< InternalLen >::append(), BuildCFI(), llvm::MCCFIInstruction::createEscape(), llvm::MCCFIInstruction::createOffset(), llvm::MCCFIInstruction::createRestore(), DL, llvm::encodeSLEB128(), llvm::encodeULEB128(), FramePtr, llvm::MachineInstr::FrameSetup, llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineFunction::getContext(), llvm::MachineFunction::getFrameInfo(), llvm::X86RegisterInfo::getFrameRegister(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineBasicBlock::getParent(), llvm::MCContext::getRegisterInfo(), llvm::X86MachineFunctionInfo::getStackPtrSaveMI(), llvm::getX86SubSuperRegister(), I, llvm::X86Subtarget::isTarget64BitILP32(), MBB, MBBI, MI, MRI, llvm::Offset, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorBase< Size_T >::size(), SlotSize, STI, llvm::SmallString< InternalLen >::str(), and TRI.

Referenced by emitCalleeSavedFrameMovesFullCFA(), emitEpilogue(), and emitPrologue().

emitCalleeSavedFrameMovesFullCFA()

void X86FrameLowering::emitCalleeSavedFrameMovesFullCFA ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI  ) const

overridevirtual

Emits Dwarf Info specifying offsets of callee saved registers and frame pointer.

This is called only when basic block sections are enabled.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 463 of file X86FrameLowering.cpp.

References BuildCFI(), llvm::MCCFIInstruction::createOffset(), emitCalleeSavedFrameMoves(), FramePtr, llvm::MachineFunction::getContext(), llvm::X86RegisterInfo::getFrameRegister(), llvm::MachineBasicBlock::getParent(), llvm::MCContext::getRegisterInfo(), llvm::getX86SubSuperRegister(), hasFP(), Is64Bit, llvm::X86Subtarget::isTarget64BitILP32(), MBB, MBBI, MRI, llvm::Offset, STI, TRI, and Uses64BitFramePtr.

emitEpilogue()

void X86FrameLowering::emitEpilogue ( MachineFunction &  MF, MachineBasicBlock &  MBB  ) const

overridevirtual

Implements llvm::TargetFrameLowering.

Definition at line 2343 of file X86FrameLowering.cpp.

References llvm::addFrameReference(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::addRegOffset(), llvm::MachineInstrBuilder::addUse(), llvm::alignTo(), assert(), llvm::MachineBasicBlock::begin(), BuildCFI(), llvm::BuildMI(), calculateSetFPREG(), llvm::MCCFIInstruction::cfiDefCfa(), llvm::MCCFIInstruction::cfiDefCfaOffset(), llvm::MCCFIInstruction::createRestore(), DL, emitCalleeSavedFrameMoves(), emitSPUpdate(), llvm::MachineBasicBlock::end(), llvm::MachineInstr::FrameDestroy, FramePtr, llvm::X86MachineFunctionInfo::getAMXProgModel(), llvm::X86MachineFunctionInfo::getCalleeSavedFrameSize(), llvm::MachineBasicBlock::getFirstTerminator(), llvm::MachineFunction::getFrameInfo(), llvm::X86RegisterInfo::getFrameRegister(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), getLEArOpcode(), llvm::TargetMachine::getMCAsmInfo(), getPOPOpcode(), llvm::X86MachineFunctionInfo::getStackPtrSaveMI(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), llvm::MachineFunction::getTarget(), llvm::TargetMachine::getTargetTriple(), llvm::X86MachineFunctionInfo::getTCReturnAddrDelta(), llvm::getX86SubSuperRegister(), hasFP(), llvm::X86MachineFunctionInfo::hasSwiftAsyncContext(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFunction::hasWinCFI(), Is64Bit, isFuncletReturnInstr(), llvm::Triple::isOSDarwin(), llvm::Triple::isOSWindows(), llvm::MachineBasicBlock::isReturnBlock(), isTailCallOpcode(), llvm::X86Subtarget::isTarget64BitILP32(), llvm::Register::isValid(), llvm::ManagedRA, MBB, MBBI, mergeSPUpdates(), MI, llvm::MachineFunction::needsFrameMoves(), llvm::Function::needsUnwindTableEntry(), llvm::Offset, llvm::MachineInstrBuilder::setMIFlag(), SlotSize, StackPtr, STI, llvm::MachineBasicBlock::succ_empty(), TII, TRI, Uses64BitFramePtr, and llvm::MCAsmInfo::usesWindowsCFI().

emitPrologue()

void X86FrameLowering::emitPrologue ( MachineFunction &  MF, MachineBasicBlock &  MBB  ) const

overridevirtual

emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.

emitPrologue - Push callee-saved registers onto the stack, which automatically adjust the stack pointer.

Adjust the stack pointer to allocate space for local variables. Also emit labels used by the exception handler to generate the exception handling frames.

Implements llvm::TargetFrameLowering.

Definition at line 1527 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addExternalSymbol(), llvm::addFrameReference(), llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addMemOperand(), llvm::MachineInstrBuilder::addReg(), llvm::addRegOffset(), llvm::MachineInstrBuilder::addUse(), llvm::MachineFrameInfo::adjustsStack(), llvm::alignTo(), llvm::Alloc, llvm::Always, llvm::SmallString< InternalLen >::append(), llvm::Function::arg_size(), assert(), B, llvm::MachineBasicBlock::begin(), BuildCFI(), llvm::BuildMI(), calculateSetFPREG(), llvm::MCCFIInstruction::cfiDefCfa(), llvm::MCCFIInstruction::cfiDefCfaOffset(), llvm::classifyEHPersonality(), contains(), llvm::CoreCLR, llvm::MCCFIInstruction::createDefCfaRegister(), llvm::MCCFIInstruction::createEscape(), llvm::MCCFIInstruction::createOffset(), llvm::DeploymentBased, DL, llvm::WinEHFuncInfo::EHRegNodeFrameIndex, emitCalleeSavedFrameMoves(), emitSPUpdate(), emitStackProbe(), llvm::encodeULEB128(), llvm::MachineBasicBlock::end(), FramePtr, llvm::MachineInstr::FrameSetup, llvm::Function::getAttributes(), llvm::X86RegisterInfo::getBaseRegister(), llvm::X86MachineFunctionInfo::getCalleeSavedFrameSize(), llvm::Function::getCallingConv(), llvm::Module::getCodeViewFlag(), llvm::StackOffset::getFixed(), llvm::MachinePointerInfo::getFixedStack(), getFrameIndexReference(), llvm::MachineFunction::getFrameInfo(), llvm::X86RegisterInfo::getFrameRegister(), llvm::MachineFunction::getFunction(), llvm::X86MachineFunctionInfo::getHasSEHFramePtrSave(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getMachineMemOperand(), getMOVriOpcode(), llvm::GlobalValue::getParent(), llvm::Function::getPersonalityFn(), getPUSHOpcode(), llvm::MachineFunction::getRegInfo(), llvm::X86MachineFunctionInfo::getRestoreBasePointer(), llvm::X86MachineFunctionInfo::getRestoreBasePointerOffset(), llvm::X86MachineFunctionInfo::getSEHFramePtrSaveIndex(), llvm::X86TargetLowering::getStackProbeSize(), llvm::X86MachineFunctionInfo::getStackPtrSaveMI(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), llvm::MachineFunction::getTarget(), llvm::X86Subtarget::getTargetLowering(), llvm::X86MachineFunctionInfo::getTCReturnAddrDelta(), llvm::X86MachineFunctionInfo::getUsesRedZone(), getWin64EHFrameIndexRef(), llvm::MachineFunction::getWinEHFuncInfo(), llvm::getX86SubSuperRegister(), has128ByteRedZone(), llvm::X86RegisterInfo::hasBasePointer(), llvm::MachineFrameInfo::hasCopyImplyingStackAdjustment(), llvm::MachineFunction::hasEHFunclets(), hasFP(), llvm::Function::hasPersonalityFn(), llvm::X86TargetLowering::hasStackProbeSymbol(), llvm::X86MachineFunctionInfo::hasSwiftAsyncContext(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineBasicBlock::insert(), Is64Bit, llvm::isAsynchronousEHPersonality(), llvm::MachineBasicBlock::isCleanupFuncletEntry(), isEAXLiveIn(), llvm::MachineBasicBlock::isEHFuncletEntry(), isOpcodeRep(), llvm::MachineRegisterInfo::isReserved(), llvm::X86InstrInfo::isStoreToStackSlot(), llvm::X86Subtarget::isTarget64BitILP32(), llvm::X86Subtarget::isTargetWin32(), llvm::Register::isValid(), llvm::RegState::Kill, MBB, MBBI, mergeSPUpdates(), MI, llvm::X86II::MO_GOTPCREL, llvm::MachineMemOperand::MOLoad, llvm::MachineMemOperand::MOStore, llvm::MachineMemOperand::MOVolatile, llvm::MSVC_CXX, llvm::Function::needsUnwindTableEntry(), llvm::Never, llvm::Offset, llvm::TargetMachine::Options, llvm::WinEHFuncInfo::PSPSymFrameIdx, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::report_fatal_error(), restoreWin32EHStackPointers(), llvm::WinEHFuncInfo::SEHSetFrameOffset, llvm::MachineFunction::setHasWinCFI(), llvm::MachineInstrBuilder::setMIFlag(), llvm::MachineFrameInfo::setOffsetAdjustment(), llvm::MachineFrameInfo::setStackSize(), llvm::X86MachineFunctionInfo::setUsesRedZone(), llvm::MachineFunction::shouldSplitStack(), SlotSize, StackPtr, STI, llvm::SmallString< InternalLen >::str(), llvm::X86Subtarget::swiftAsyncContextIsDynamicallySet(), llvm::TargetOptions::SwiftAsyncFramePointer, TII, TRI, llvm::RegState::Undef, llvm::Unknown, Uses64BitFramePtr, and llvm::CallingConv::X86_INTR.

emitSPUpdate()

void X86FrameLowering::emitSPUpdate	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator &	MBBI,
		const DebugLoc &	DL,
		int64_t	NumBytes,
		bool	InEpilogue
	)		const

Emit a series of instructions to increment / decrement the stack pointer by a constant value.

emitSPUpdate - Emit a series of instructions to increment / decrement the stack pointer by a constant value.

Definition at line 230 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::addRegOffset(), assert(), llvm::BuildMI(), DL, llvm::X86RegisterInfo::findDeadCallerSavedReg(), llvm::MachineInstr::FrameDestroy, llvm::MachineInstr::FrameSetup, getADDrrOpcode(), llvm::getDefRegState(), getMOVriOpcode(), llvm::MachineBasicBlock::getParent(), getSUBrrOpcode(), llvm::MachineFunction::getSubtarget(), llvm::X86Subtarget::getTargetLowering(), llvm::getUndefRegState(), llvm::X86TargetLowering::hasInlineStackProbe(), Is64Bit, isEAXLiveIn(), llvm::RegState::Kill, MBB, MBBI, MI, llvm::Offset, llvm::MachineInstrBuilder::setMIFlag(), SlotSize, StackPtr, STI, TII, and TRI.

Referenced by emitEpilogue(), emitPrologue(), restoreCalleeSavedRegisters(), and spillCalleeSavedRegisters().

emitStackProbe()

void X86FrameLowering::emitStackProbe	(	MachineFunction &	MF,
		MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	DL,
		bool	InProlog,
		std::optional< MachineFunction::DebugInstrOperandPair >	InstrNum = std::nullopt
	)		const

Emit target stack probe code.

This is required for all large stack allocations on Windows. The caller is required to materialize the number of bytes to probe in RAX/EAX. InstrNum optionally contains a debug-info instruction number for the new stack pointer.

Definition at line 604 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::BuildMI(), DL, llvm::MachineFunction::getSubtarget(), llvm::X86Subtarget::isTargetWindowsCoreCLR(), MBB, MBBI, STI, and TII.

Referenced by emitPrologue().

enableShrinkWrapping()

bool X86FrameLowering::enableShrinkWrapping ( const MachineFunction &  MF ) const

overridevirtual

Returns true if the target will correctly handle shrink wrapping.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3879 of file X86FrameLowering.cpp.

References llvm::Function::getCallingConv(), llvm::MCObjectFileInfo::getCompactUnwindSection(), llvm::MachineFunction::getContext(), llvm::MachineFunction::getFunction(), llvm::MCContext::getObjectFileInfo(), llvm::Function::hasFnAttribute(), hasFP(), llvm::CallingConv::HiPE, and llvm::MachineFunction::shouldSplitStack().

getDwarfFrameBase()

TargetFrameLowering::DwarfFrameBase X86FrameLowering::getDwarfFrameBase ( const MachineFunction &  MF ) const

overridevirtual

Return the frame base information to be encoded in the DWARF subprogram debug info.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3968 of file X86FrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), llvm::TargetRegisterInfo::getFrameRegister(), llvm::MachineFunction::getInfo(), getInitialCFAOffset(), getInitialCFARegister(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), llvm::X86MachineFunctionInfo::hasCFIAdjustCfa(), llvm::TargetFrameLowering::DwarfFrameBase::Kind, llvm::TargetFrameLowering::DwarfFrameBase::Location, and llvm::TargetFrameLowering::DwarfFrameBase::Offset.

getFrameIndexReference()

StackOffset X86FrameLowering::getFrameIndexReference ( const MachineFunction &  MF, int  FI, Register &  FrameReg  ) const

overridevirtual

getFrameIndexReference - This method should return the base register and offset used to reference a frame index location.

Returns the displacement from the frame register to the stack frame of the specified index, along with the frame register used (in output arg FrameReg).

The offset is returned directly, and the base register is returned via FrameReg.

This is the default implementation which is overridden for some targets.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 2600 of file X86FrameLowering.cpp.

References assert(), calculateSetFPREG(), llvm::X86RegisterInfo::getBaseRegister(), llvm::X86MachineFunctionInfo::getCalleeSavedFrameSize(), llvm::Function::getCallingConv(), llvm::X86MachineFunctionInfo::getFAIndex(), llvm::StackOffset::getFixed(), llvm::MachineFunction::getFrameInfo(), llvm::X86RegisterInfo::getFramePtr(), llvm::X86RegisterInfo::getFrameRegister(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getMCAsmInfo(), llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetFrameLowering::getOffsetOfLocalArea(), llvm::X86MachineFunctionInfo::getRestoreBasePointer(), llvm::X86RegisterInfo::getStackRegister(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getTarget(), llvm::X86MachineFunctionInfo::getTCReturnAddrDelta(), llvm::X86RegisterInfo::hasBasePointer(), llvm::MachineFrameInfo::hasCalls(), llvm::isAligned(), llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::Offset, SlotSize, TRI, llvm::MCAsmInfo::usesWindowsCFI(), and llvm::CallingConv::X86_INTR.

Referenced by llvm::X86RegisterInfo::eliminateFrameIndex(), emitPrologue(), getFrameIndexReferencePreferSP(), getWin64EHFrameIndexRef(), and restoreWin32EHStackPointers().

getFrameIndexReferencePreferSP()

StackOffset X86FrameLowering::getFrameIndexReferencePreferSP ( const MachineFunction &  MF, int  FI, Register &  FrameReg, bool  IgnoreSPUpdates  ) const

overridevirtual

Same as getFrameIndexReference, except that the stack pointer (as opposed to the frame pointer) will be the preferred value for FrameReg.

This is generally used for emitting statepoint or EH tables that use offsets from RSP. If IgnoreSPUpdates is true, the returned offset is only guaranteed to be valid with respect to the value of SP at the end of the prologue.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 2709 of file X86FrameLowering.cpp.

References assert(), getFrameIndexReference(), getFrameIndexReferenceSP(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::X86MachineFunctionInfo::getTCReturnAddrDelta(), hasReservedCallFrame(), llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::X86Subtarget::isTargetWin64(), STI, and TRI.

getFrameIndexReferenceSP()

StackOffset X86FrameLowering::getFrameIndexReferenceSP	(	const MachineFunction &	MF,
		int	FI,
		Register &	SPReg,
		int	Adjustment
	)		const

Definition at line 2699 of file X86FrameLowering.cpp.

References llvm::StackOffset::getFixed(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetFrameLowering::getOffsetOfLocalArea(), llvm::X86RegisterInfo::getStackRegister(), and TRI.

Referenced by llvm::X86RegisterInfo::eliminateFrameIndex(), and getFrameIndexReferencePreferSP().

getInitialCFAOffset()

int X86FrameLowering::getInitialCFAOffset ( const MachineFunction &  MF ) const

overridevirtual

Return initial CFA offset value i.e.

the one valid at the beginning of the function (before any stack operations).

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3958 of file X86FrameLowering.cpp.

References llvm::X86RegisterInfo::getSlotSize(), and TRI.

Referenced by getDwarfFrameBase().

getInitialCFARegister()

Register X86FrameLowering::getInitialCFARegister ( const MachineFunction &  MF ) const

overridevirtual

Return initial CFA register value i.e.

the one valid at the beginning of the function (before any stack operations).

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3963 of file X86FrameLowering.cpp.

References StackPtr.

Referenced by getDwarfFrameBase().

getWin64EHFrameIndexRef()

int X86FrameLowering::getWin64EHFrameIndexRef	(	const MachineFunction &	MF,
		int	FI,
		Register &	SPReg
	)		const

Definition at line 2683 of file X86FrameLowering.cpp.

References llvm::alignDown(), llvm::StackOffset::getFixed(), getFrameIndexReference(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getMaxCallFrameSize(), llvm::TargetFrameLowering::getStackAlign(), llvm::X86RegisterInfo::getStackRegister(), llvm::X86MachineFunctionInfo::getWinEHXMMSlotInfo(), TRI, and value.

Referenced by llvm::X86RegisterInfo::eliminateFrameIndex(), and emitPrologue().

getWinEHParentFrameOffset()

unsigned X86FrameLowering::getWinEHParentFrameOffset ( const MachineFunction &  MF ) const

overridevirtual

Reimplemented from llvm::TargetFrameLowering.

Definition at line 4126 of file X86FrameLowering.cpp.

References llvm::MachineFunction::getInfo(), llvm::Offset, and SlotSize.

has128ByteRedZone()

bool X86FrameLowering::has128ByteRedZone

(

const MachineFunction &

MF

)

const

Return true if the function has a redzone (accessible bytes past the frame of the top of stack function) as part of it's ABI.

Definition at line 1393 of file X86FrameLowering.cpp.

References assert(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getSubtarget(), llvm::Function::hasFnAttribute(), Is64Bit, llvm::X86Subtarget::isCallingConvWin64(), and STI.

Referenced by emitLockedStackOp(), emitPrologue(), and llvm::X86InstrInfo::isFunctionSafeToOutlineFrom().

hasFP()

bool X86FrameLowering::hasFP ( const MachineFunction &  MF ) const

overridevirtual

hasFP - Return true if the specified function should have a dedicated frame pointer register.

This is true if the function has variable sized allocas or if frame pointer elimination is disabled.

Implements llvm::TargetFrameLowering.

Definition at line 98 of file X86FrameLowering.cpp.

References llvm::MachineFunction::callsEHReturn(), llvm::MachineFunction::callsUnwindInit(), llvm::TargetOptions::DisableFramePointerElim(), llvm::X86MachineFunctionInfo::getForceFramePointer(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getTarget(), llvm::MachineFrameInfo::hasCopyImplyingStackAdjustment(), llvm::MachineFunction::hasEHFunclets(), llvm::MachineFrameInfo::hasOpaqueSPAdjustment(), llvm::MachineFrameInfo::hasPatchPoint(), llvm::X86MachineFunctionInfo::hasPreallocatedCall(), llvm::MachineFrameInfo::hasStackMap(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFrameInfo::isFrameAddressTaken(), llvm::TargetMachine::Options, and TRI.

Referenced by assignCalleeSavedSpillSlots(), canSimplifyCallFramePseudos(), canUseLEAForSPInEpilogue(), eliminateCallFramePseudoInstr(), emitCalleeSavedFrameMovesFullCFA(), emitEpilogue(), llvm::X86AsmPrinter::emitInstruction(), emitPrologue(), enableShrinkWrapping(), ExpandMOVImmSExti8(), llvm::X86RegisterInfo::getFrameRegister(), llvm::X86RegisterInfo::getPointerRegClass(), llvm::X86RegisterInfo::getRegPressureLimit(), llvm::X86RegisterInfo::getReservedRegs(), llvm::X86RegisterInfo::isFixedRegister(), and orderFrameObjects().

hasReservedCallFrame()

bool X86FrameLowering::hasReservedCallFrame ( const MachineFunction &  MF ) const

overridevirtual

hasReservedCallFrame - Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function.

This eliminates the need for add/sub sp brackets around call sites. Returns true if the call frame is included as part of the stack frame.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 64 of file X86FrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), and llvm::MachineFrameInfo::hasVarSizedObjects().

Referenced by canSimplifyCallFramePseudos(), eliminateCallFramePseudoInstr(), and getFrameIndexReferencePreferSP().

inlineStackProbe()

void X86FrameLowering::inlineStackProbe ( MachineFunction &  MF, MachineBasicBlock &  PrologMBB  ) const

overridevirtual

Replace a StackProbe inline-stub with the actual probe code inline.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 625 of file X86FrameLowering.cpp.

References DL, llvm::MachineBasicBlock::end(), llvm::find_if(), llvm::MachineBasicBlock::findDebugLoc(), and MI.

mergeSPUpdates()

int X86FrameLowering::mergeSPUpdates	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator &	MBBI,
		bool	doMergeWithPrevious
	)		const

Check the instruction before/after the passed instruction.

If it is an ADD/SUB/LEA instruction it is deleted argument and the stack adjustment is returned as a positive value for ADD/LEA and a negative for SUB.

Definition at line 385 of file X86FrameLowering.cpp.

References assert(), llvm::MachineBasicBlock::begin(), llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::erase(), llvm::MachineFunction::getFrameInstructions(), llvm::MCCFIInstruction::getOperation(), llvm::MachineBasicBlock::getParent(), MBB, MBBI, llvm::Offset, llvm::MCCFIInstruction::OpAdjustCfaOffset, llvm::MCCFIInstruction::OpDefCfaOffset, llvm::skipDebugInstructionsBackward(), llvm::skipDebugInstructionsForward(), and StackPtr.

Referenced by eliminateCallFramePseudoInstr(), emitEpilogue(), and emitPrologue().

needsFrameIndexResolution()

bool X86FrameLowering::needsFrameIndexResolution ( const MachineFunction &  MF ) const

overridevirtual

Reimplemented from llvm::TargetFrameLowering.

Definition at line 89 of file X86FrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), and llvm::MachineFrameInfo::hasStackObjects().

orderFrameObjects()

void X86FrameLowering::orderFrameObjects ( const MachineFunction &  MF, SmallVectorImpl< int > &  ObjectsToAllocate  ) const

overridevirtual

Order the symbols in the local stack.

We want to place the local stack objects in some sort of sensible order. The heuristic we use is to try and pack them according to static number of uses and size in order to minimize code size.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 4054 of file X86FrameLowering.cpp.

References llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::SmallVectorBase< Size_T >::empty(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectIndexEnd(), llvm::MachineFrameInfo::getObjectSize(), hasFP(), MBB, MI, llvm::stable_sort(), and TRI.

processFunctionBeforeFrameFinalized()

void X86FrameLowering::processFunctionBeforeFrameFinalized ( MachineFunction &  MF, RegScavenger *  RS  ) const

overridevirtual

processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized.

Once the frame is finalized, MO_FrameIndex operands are replaced with direct constants. This method is optional.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 4138 of file X86FrameLowering.cpp.

References llvm::RegScavenger::addScavengingFrameIndex(), llvm::classifyEHPersonality(), llvm::MachineFrameInfo::CreateStackObject(), llvm::MachineFrameInfo::ensureMaxAlignment(), llvm::MachineFrameInfo::estimateStackSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::TargetMachine::getMCAsmInfo(), llvm::Function::getPersonalityFn(), llvm::MachineFunction::getTarget(), llvm::MachineFunction::hasEHFunclets(), llvm::MSVC_CXX, llvm::MachineFunction::setHasWinCFI(), SlotSize, STI, and llvm::MCAsmInfo::usesWindowsCFI().

processFunctionBeforeFrameIndicesReplaced()

void X86FrameLowering::processFunctionBeforeFrameIndicesReplaced ( MachineFunction &  MF, RegScavenger *  RS  ) const

overridevirtual

processFunctionBeforeFrameIndicesReplaced - This method is called immediately before MO_FrameIndex operands are eliminated, but after the frame is finalized.

This method is optional.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 4211 of file X86FrameLowering.cpp.

References llvm::MachineFunction::getInfo(), llvm::X86MachineFunctionInfo::getStackPtrSaveMI(), llvm::MachineFunction::hasEHFunclets(), MI, restoreWinEHStackPointersInParent(), llvm::X86MachineFunctionInfo::setStackPtrSaveMI(), and STI.

restoreCalleeSavedRegisters()

bool X86FrameLowering::restoreCalleeSavedRegisters ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MI, MutableArrayRef< CalleeSavedInfo >  CSI, const TargetRegisterInfo *  TRI  ) const

overridevirtual

restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of load instructions via loadRegToStackSlot().

If it returns true, and any of the registers in CSI is not restored, it sets the corresponding Restored flag in CSI to false. Returns false otherwise.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3069 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addReg(), llvm::MutableArrayRef< T >::begin(), llvm::BuildMI(), llvm::classifyEHPersonality(), contains(), llvm::RegState::Define, DL, emitSPUpdate(), llvm::ArrayRef< T >::empty(), llvm::MachineBasicBlock::end(), llvm::MutableArrayRef< T >::end(), F, llvm::MachineBasicBlock::findDebugLoc(), llvm::MachineInstr::FrameDestroy, llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineBasicBlock::getParent(), getPOP2Opcode(), getPOPOpcode(), getReg(), llvm::X86MachineFunctionInfo::getRestoreBasePointer(), I, llvm::isAsynchronousEHPersonality(), llvm::X86MachineFunctionInfo::isCandidateForPush2Pop2(), isFuncletReturnInstr(), llvm::X86Subtarget::isOSWindows(), llvm::X86InstrInfo::loadRegFromStackSlot(), MBB, MI, llvm::X86MachineFunctionInfo::padForPush2Pop2(), llvm::MachineInstrBuilder::setMIFlag(), SlotSize, STI, TII, and TRI.

restoreWin32EHStackPointers()

MachineBasicBlock::iterator X86FrameLowering::restoreWin32EHStackPointers	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MBBI,
		const DebugLoc &	DL,
		bool	RestoreSP = false
	)		const

Sets up EBP and optionally ESI based on the incoming EBP value.

Only needed for 32-bit. Used in funclet prologues and at catchret destinations.

Definition at line 3895 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::addRegOffset(), assert(), llvm::BuildMI(), DL, llvm::WinEHFuncInfo::EHRegNodeEndOffset, llvm::WinEHFuncInfo::EHRegNodeFrameIndex, FramePtr, llvm::MachineInstr::FrameSetup, getADDriOpcode(), llvm::X86RegisterInfo::getBaseRegister(), llvm::StackOffset::getFixed(), getFrameIndexReference(), llvm::MachineFunction::getFrameInfo(), llvm::X86RegisterInfo::getFrameRegister(), llvm::X86MachineFunctionInfo::getHasSEHFramePtrSave(), llvm::MachineFunction::getInfo(), llvm::MachineInstr::getOperand(), llvm::MachineBasicBlock::getParent(), llvm::X86MachineFunctionInfo::getSEHFramePtrSaveIndex(), llvm::MachineFunction::getWinEHFuncInfo(), llvm::X86Subtarget::isTargetWin32(), llvm::X86Subtarget::isTargetWindowsMSVC(), llvm_unreachable, MBB, MBBI, llvm::Offset, llvm::MachineOperand::setIsDead(), llvm::MachineInstrBuilder::setMIFlag(), STI, TII, TRI, and Uses64BitFramePtr.

Referenced by emitPrologue(), and restoreWinEHStackPointersInParent().

restoreWinEHStackPointersInParent()

void X86FrameLowering::restoreWinEHStackPointersInParent

(

MachineFunction &

MF

)

const

Definition at line 4225 of file X86FrameLowering.cpp.

References llvm::MachineBasicBlock::begin(), llvm::classifyEHPersonality(), llvm::MachineFunction::getFunction(), llvm::Function::getPersonalityFn(), llvm::isAsynchronousEHPersonality(), llvm::MachineBasicBlock::isEHFuncletEntry(), llvm::MachineBasicBlock::isEHPad(), MBB, and restoreWin32EHStackPointers().

Referenced by processFunctionBeforeFrameIndicesReplaced().

spillCalleeSavedRegisters()

bool X86FrameLowering::spillCalleeSavedRegisters ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MI, ArrayRef< CalleeSavedInfo >  CSI, const TargetRegisterInfo *  TRI  ) const

overridevirtual

spillCalleeSavedRegisters - Issues instruction(s) to spill all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of store instructions via storeRegToStackSlot().

Returns false otherwise.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 2949 of file X86FrameLowering.cpp.

References llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), contains(), DL, emitSPUpdate(), llvm::MachineBasicBlock::findDebugLoc(), llvm::MachineInstr::FrameSetup, llvm::MachineFunction::getInfo(), llvm::getKillRegState(), llvm::MachineBasicBlock::getParent(), getPUSH2Opcode(), getPUSHOpcode(), getReg(), llvm::MachineFunction::getRegInfo(), llvm::X86MachineFunctionInfo::getRestoreBasePointer(), I, llvm::X86MachineFunctionInfo::isCandidateForPush2Pop2(), llvm::MachineBasicBlock::isEHFuncletEntry(), llvm::X86Subtarget::isOSWindows(), llvm::MCRegAliasIterator::isValid(), MBB, MI, MRI, llvm::X86MachineFunctionInfo::padForPush2Pop2(), llvm::ArrayRef< T >::rbegin(), llvm::ArrayRef< T >::rend(), llvm::reverse(), llvm::MachineInstrBuilder::setMIFlag(), SlotSize, STI, llvm::X86InstrInfo::storeRegToStackSlot(), TII, and TRI.

spillFPBP()

void X86FrameLowering::spillFPBP ( MachineFunction &  MF ) const

overridevirtual

If a function uses base pointer and the base pointer is clobbered by inline asm, RA doesn't detect this case, and after the inline asm, the base pointer contains garbage value.

For example if a 32b x86 function uses base pointer esi, and esi is clobbered by following inline asm asm("rep movsb" : "+D"(ptr), "+S"(x), "+c"(c)::"memory"); We need to save esi before the asm and restore it after the asm.

The problem can also occur to frame pointer if there is a function call, and the callee uses a different calling convention and clobbers the fp.

Because normal frame objects (spill slots) are accessed through fp/bp register, so we can't spill fp/bp to normal spill slots.

FIXME: There are 2 possible enhancements:

1. In many cases there are different physical registers not clobbered by inline asm, we can use one of them as base pointer. Or use a virtual register as base pointer and let RA allocate a physical register to it.
2. If there is no other instructions access stack with fp/bp from the inline asm to the epilog, and no cfi requirement for a correct fp, we can skip the save and restore operations.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 4463 of file X86FrameLowering.cpp.

References llvm::MachineBasicBlock::begin(), DefMI, FP, llvm::MachineInstr::FrameDestroy, llvm::MachineInstr::FrameSetup, llvm::X86RegisterInfo::getBaseRegister(), llvm::X86MachineFunctionInfo::getBPClobberedByCall(), llvm::MachineBasicBlock::getFirstTerminator(), llvm::X86MachineFunctionInfo::getFPClobberedByCall(), llvm::TargetSubtargetInfo::getFrameLowering(), llvm::X86RegisterInfo::getFrameRegister(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineFunction::getSubtarget(), llvm::X86RegisterInfo::hasBasePointer(), llvm::TargetFrameLowering::hasFP(), llvm::MachineFunction::hasInlineAsm(), isFPBPAccess(), isInvoke(), MBB, MI, llvm::MachineBasicBlock::rbegin(), llvm::MachineBasicBlock::rend(), TII, and TRI.

stackProbeFunctionModifiesSP()

bool X86FrameLowering::stackProbeFunctionModifiesSP ( ) const

overridevirtual

Does the stack probe function call return with a modified stack pointer?

Reimplemented from llvm::TargetFrameLowering.

Definition at line 621 of file X86FrameLowering.cpp.

References llvm::X86Subtarget::isOSWindows(), llvm::X86Subtarget::isTargetWin64(), and STI.

Member Data Documentation

Is64Bit

bool llvm::X86FrameLowering::Is64Bit

Is64Bit implies that x86_64 instructions are available.

Definition at line 41 of file X86FrameLowering.h.

Referenced by adjustForHiPEPrologue(), adjustForSegmentedStacks(), llvm::X86RegisterInfo::eliminateFrameIndex(), emitCalleeSavedFrameMovesFullCFA(), emitEpilogue(), emitPrologue(), emitSPUpdate(), has128ByteRedZone(), and X86FrameLowering().

IsLP64

bool llvm::X86FrameLowering::IsLP64

Definition at line 43 of file X86FrameLowering.h.

Referenced by adjustForHiPEPrologue(), adjustForSegmentedStacks(), and X86FrameLowering().

SlotSize

unsigned llvm::X86FrameLowering::SlotSize

Definition at line 38 of file X86FrameLowering.h.

Referenced by adjustForHiPEPrologue(), assignCalleeSavedSpillSlots(), emitCalleeSavedFrameMoves(), emitEpilogue(), emitPrologue(), emitSPUpdate(), getFrameIndexReference(), getWinEHParentFrameOffset(), processFunctionBeforeFrameFinalized(), restoreCalleeSavedRegisters(), spillCalleeSavedRegisters(), and X86FrameLowering().

StackPtr

unsigned llvm::X86FrameLowering::StackPtr

Definition at line 50 of file X86FrameLowering.h.

Referenced by emitEpilogue(), emitPrologue(), emitSPUpdate(), getInitialCFARegister(), mergeSPUpdates(), and X86FrameLowering().

STI

const X86Subtarget& llvm::X86FrameLowering::STI

Definition at line 34 of file X86FrameLowering.h.

Referenced by adjustForHiPEPrologue(), adjustForSegmentedStacks(), assignCalleeSavedSpillSlots(), canUseAsEpilogue(), canUseAsPrologue(), determineCalleeSaves(), emitCalleeSavedFrameMoves(), emitCalleeSavedFrameMovesFullCFA(), emitEpilogue(), emitPrologue(), emitSPUpdate(), emitStackProbe(), getFrameIndexReferencePreferSP(), has128ByteRedZone(), processFunctionBeforeFrameFinalized(), processFunctionBeforeFrameIndicesReplaced(), restoreCalleeSavedRegisters(), restoreWin32EHStackPointers(), spillCalleeSavedRegisters(), stackProbeFunctionModifiesSP(), and X86FrameLowering().

TII

const X86InstrInfo& llvm::X86FrameLowering::TII

Definition at line 35 of file X86FrameLowering.h.

Referenced by adjustForHiPEPrologue(), adjustForSegmentedStacks(), BuildCFI(), eliminateCallFramePseudoInstr(), emitEpilogue(), emitPrologue(), emitSPUpdate(), emitStackProbe(), restoreCalleeSavedRegisters(), restoreWin32EHStackPointers(), spillCalleeSavedRegisters(), and spillFPBP().

TRI

const X86RegisterInfo* llvm::X86FrameLowering::TRI

Definition at line 36 of file X86FrameLowering.h.

Referenced by assignCalleeSavedSpillSlots(), canSimplifyCallFramePseudos(), canUseAsPrologue(), determineCalleeSaves(), emitCalleeSavedFrameMoves(), emitCalleeSavedFrameMovesFullCFA(), emitEpilogue(), emitPrologue(), emitSPUpdate(), getFrameIndexReference(), getFrameIndexReferencePreferSP(), getFrameIndexReferenceSP(), getInitialCFAOffset(), getWin64EHFrameIndexRef(), hasFP(), orderFrameObjects(), restoreCalleeSavedRegisters(), restoreWin32EHStackPointers(), spillCalleeSavedRegisters(), spillFPBP(), and X86FrameLowering().

Uses64BitFramePtr

bool llvm::X86FrameLowering::Uses64BitFramePtr

True if the 64-bit frame or stack pointer should be used.

True for most 64-bit targets with the exception of x32. If this is false, 32-bit instruction operands should be used to manipulate StackPtr and FramePtr.

Definition at line 48 of file X86FrameLowering.h.

Referenced by emitCalleeSavedFrameMovesFullCFA(), emitEpilogue(), emitPrologue(), llvm::X86RegisterInfo::getPointerRegClass(), restoreWin32EHStackPointers(), and X86FrameLowering().

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The documentation for this class was generated from the following files:

• lib/Target/X86/X86FrameLowering.h
• lib/Target/X86/X86FrameLowering.cpp