llvm::TargetFrameLowering Class Reference

Information about stack frame layout on the target. More...

#include "llvm/CodeGen/TargetFrameLowering.h"

Inheritance diagram for llvm::TargetFrameLowering:

Classes
struct	DwarfFrameBase
struct	SpillSlot

Public Types
enum	StackDirection { StackGrowsUp , StackGrowsDown }

Public Member Functions
	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 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.

Static Public Member Functions
static bool	isSafeForNoCSROpt (const Function &F)
	Check if given function is safe for not having callee saved registers.

Detailed Description

Information about stack frame layout on the target.

It holds the direction of stack growth, the known stack alignment on entry to each function, and the offset to the locals area.

The offset to the local area is the offset from the stack pointer on function entry to the first location where function data (local variables, spill locations) can be stored.

Definition at line 44 of file TargetFrameLowering.h.

Member Enumeration Documentation

StackDirection

enum llvm::TargetFrameLowering::StackDirection

Enumerator
StackGrowsUp
StackGrowsDown

Definition at line 46 of file TargetFrameLowering.h.

Constructor & Destructor Documentation

TargetFrameLowering()

llvm::TargetFrameLowering::TargetFrameLowering ( StackDirection  D, Align  StackAl, int  LAO, Align  TransAl = Align(1), bool  StackReal = true  )

inline

Definition at line 81 of file TargetFrameLowering.h.

~TargetFrameLowering()

TargetFrameLowering::~TargetFrameLowering ( )

virtualdefault

Member Function Documentation

adjustForHiPEPrologue()

virtual void llvm::TargetFrameLowering::adjustForHiPEPrologue ( MachineFunction &  MF, MachineBasicBlock &  PrologueMBB  ) const

inlinevirtual

Adjust the prologue to add Erlang Run-Time System (ERTS) specific code in the assembly prologue to explicitly handle the stack.

Reimplemented in llvm::X86FrameLowering.

Definition at line 251 of file TargetFrameLowering.h.

adjustForSegmentedStacks()

virtual void llvm::TargetFrameLowering::adjustForSegmentedStacks ( MachineFunction &  MF, MachineBasicBlock &  PrologueMBB  ) const

inlinevirtual

Adjust the prologue to have the function use segmented stacks.

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

Reimplemented in llvm::ARMFrameLowering, and llvm::X86FrameLowering.

Definition at line 246 of file TargetFrameLowering.h.

alignSPAdjust()

int llvm::TargetFrameLowering::alignSPAdjust ( int  SPAdj ) const

inline

alignSPAdjust - This method aligns the stack adjustment to the correct alignment.

Definition at line 113 of file TargetFrameLowering.h.

References llvm::alignTo().

Referenced by llvm::CSKYFrameLowering::eliminateCallFramePseudoInstr(), llvm::LoongArchFrameLowering::eliminateCallFramePseudoInstr(), llvm::RISCVFrameLowering::eliminateCallFramePseudoInstr(), and llvm::TargetInstrInfo::getSPAdjust().

allocateScavengingFrameIndexesNearIncomingSP()

bool TargetFrameLowering::allocateScavengingFrameIndexesNearIncomingSP ( const MachineFunction &  MF ) const

virtual

Control the placement of special register scavenging spill slots when allocating a stack frame.

If this returns true, the frame indexes used by the RegScavenger will be allocated closest to the incoming stack pointer.

Reimplemented in llvm::SIFrameLowering, llvm::MipsFrameLowering, and llvm::SystemZFrameLowering.

Definition at line 133 of file TargetFrameLoweringImpl.cpp.

References llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), hasFP(), llvm::TargetRegisterInfo::hasStackRealignment(), and llvm::TargetRegisterInfo::useFPForScavengingIndex().

assignCalleeSavedSpillSlots() [1/2]

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

inlinevirtual

Reimplemented in llvm::ARCFrameLowering, llvm::SIFrameLowering, llvm::ARMFrameLowering, llvm::CSKYFrameLowering, llvm::HexagonFrameLowering, llvm::M68kFrameLowering, llvm::PPCFrameLowering, llvm::SystemZELFFrameLowering, llvm::SystemZXPLINKFrameLowering, and llvm::X86FrameLowering.

Definition at line 168 of file TargetFrameLowering.h.

assignCalleeSavedSpillSlots() [2/2]

virtual bool llvm::TargetFrameLowering::assignCalleeSavedSpillSlots ( MachineFunction &  MF, const TargetRegisterInfo *  TRI, std::vector< CalleeSavedInfo > &  CSI, unsigned &  MinCSFrameIndex, unsigned &  MaxCSFrameIndex  ) const

inlinevirtual

assignCalleeSavedSpillSlots - Allows target to override spill slot assignment logic.

If implemented, assignCalleeSavedSpillSlots() should assign frame slots to all CSI entries and return true. If this method returns false, spill slots will be assigned using generic implementation. assignCalleeSavedSpillSlots() may add, delete or rearrange elements of CSI.

Reimplemented in llvm::AArch64FrameLowering.

Definition at line 159 of file TargetFrameLowering.h.

References assignCalleeSavedSpillSlots(), and TRI.

Referenced by assignCalleeSavedSpillSlots(), and assignCalleeSavedSpillSlots().

canSimplifyCallFramePseudos()

virtual bool llvm::TargetFrameLowering::canSimplifyCallFramePseudos ( const MachineFunction &  MF ) const

inlinevirtual

canSimplifyCallFramePseudos - When possible, it's best to simplify the call frame pseudo ops before doing frame index elimination.

This is possible only when frame index references between the pseudos won't need adjusting for the call frame adjustments. Normally, that's true if the function has a reserved call frame or a frame pointer. Some targets (Thumb2, for example) may have more complicated criteria, however, and can override this behavior.

Reimplemented in llvm::ARMFrameLowering, llvm::AVRFrameLowering, llvm::HexagonFrameLowering, llvm::M68kFrameLowering, and llvm::X86FrameLowering.

Definition at line 306 of file TargetFrameLowering.h.

References hasFP(), and hasReservedCallFrame().

canUseAsEpilogue()

virtual bool llvm::TargetFrameLowering::canUseAsEpilogue ( const MachineBasicBlock &  MBB ) const

inlinevirtual

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. As soon as the target enable shrink-wrapping without overriding this method, we assume that each basic block is a valid epilogue.

Reimplemented in llvm::Thumb1FrameLowering, llvm::PPCFrameLowering, llvm::RISCVFrameLowering, and llvm::X86FrameLowering.

Definition at line 430 of file TargetFrameLowering.h.

canUseAsPrologue()

virtual bool llvm::TargetFrameLowering::canUseAsPrologue ( const MachineBasicBlock &  MBB ) const

inlinevirtual

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 in llvm::AArch64FrameLowering, llvm::PPCFrameLowering, llvm::RISCVFrameLowering, and llvm::X86FrameLowering.

Definition at line 418 of file TargetFrameLowering.h.

determineCalleeSaves()

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

virtual

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 in llvm::AArch64FrameLowering, llvm::ARCFrameLowering, llvm::ARMFrameLowering, llvm::BPFFrameLowering, llvm::CSKYFrameLowering, llvm::HexagonFrameLowering, llvm::LoongArchFrameLowering, llvm::Mips16FrameLowering, llvm::MipsSEFrameLowering, llvm::RISCVFrameLowering, llvm::SystemZELFFrameLowering, llvm::SystemZXPLINKFrameLowering, llvm::SIFrameLowering, llvm::AVRFrameLowering, llvm::LanaiFrameLowering, llvm::M68kFrameLowering, llvm::PPCFrameLowering, llvm::SparcFrameLowering, llvm::VEFrameLowering, llvm::X86FrameLowering, and llvm::XCoreFrameLowering.

Definition at line 82 of file TargetFrameLoweringImpl.cpp.

References llvm::MachineFunction::callsUnwindInit(), enableCalleeSaveSkip(), llvm::TargetOptions::EnableIPRA, llvm::MachineRegisterInfo::getCalleeSavedRegs(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getRegInfo(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), llvm::MachineFunction::getTarget(), llvm::Function::hasFnAttribute(), isProfitableForNoCSROpt(), isSafeForNoCSROpt(), MRI, llvm::TargetMachine::Options, llvm::BitVector::resize(), llvm::BitVector::set(), and TRI.

Referenced by llvm::AArch64FrameLowering::determineCalleeSaves(), llvm::ARCFrameLowering::determineCalleeSaves(), llvm::ARMFrameLowering::determineCalleeSaves(), llvm::BPFFrameLowering::determineCalleeSaves(), llvm::CSKYFrameLowering::determineCalleeSaves(), llvm::HexagonFrameLowering::determineCalleeSaves(), llvm::LoongArchFrameLowering::determineCalleeSaves(), llvm::Mips16FrameLowering::determineCalleeSaves(), llvm::MipsSEFrameLowering::determineCalleeSaves(), llvm::RISCVFrameLowering::determineCalleeSaves(), llvm::SystemZELFFrameLowering::determineCalleeSaves(), llvm::SystemZXPLINKFrameLowering::determineCalleeSaves(), llvm::SIFrameLowering::determineCalleeSaves(), llvm::AVRFrameLowering::determineCalleeSaves(), llvm::LanaiFrameLowering::determineCalleeSaves(), llvm::M68kFrameLowering::determineCalleeSaves(), llvm::PPCFrameLowering::determineCalleeSaves(), llvm::SparcFrameLowering::determineCalleeSaves(), llvm::VEFrameLowering::determineCalleeSaves(), llvm::X86FrameLowering::determineCalleeSaves(), llvm::XCoreFrameLowering::determineCalleeSaves(), and llvm::SIFrameLowering::determineCalleeSavesSGPR().

eliminateCallFramePseudoInstr()

virtual MachineBasicBlock::iterator llvm::TargetFrameLowering::eliminateCallFramePseudoInstr ( MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MI  ) const

inlinevirtual

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 in llvm::AArch64FrameLowering, llvm::ARCFrameLowering, llvm::HexagonFrameLowering, llvm::LanaiFrameLowering, llvm::MipsFrameLowering, llvm::MSP430FrameLowering, llvm::NVPTXFrameLowering, llvm::PPCFrameLowering, llvm::SparcFrameLowering, llvm::VEFrameLowering, llvm::WebAssemblyFrameLowering, llvm::XCoreFrameLowering, llvm::SIFrameLowering, llvm::Thumb1FrameLowering, llvm::AVRFrameLowering, llvm::BPFFrameLowering, llvm::CSKYFrameLowering, llvm::LoongArchFrameLowering, llvm::M68kFrameLowering, llvm::RISCVFrameLowering, llvm::SystemZFrameLowering, and llvm::X86FrameLowering.

Definition at line 391 of file TargetFrameLowering.h.

References llvm_unreachable.

emitCalleeSavedFrameMovesFullCFA()

virtual void llvm::TargetFrameLowering::emitCalleeSavedFrameMovesFullCFA ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI  ) const

inlinevirtual

With basic block sections, emit callee saved frame moves for basic blocks that are in a different section.

Reimplemented in llvm::X86FrameLowering.

Definition at line 226 of file TargetFrameLowering.h.

emitEpilogue()

virtual void llvm::TargetFrameLowering::emitEpilogue ( MachineFunction &  MF, MachineBasicBlock &  MBB  ) const

pure virtual

Implemented in llvm::DirectXFrameLowering, llvm::AArch64FrameLowering, llvm::R600FrameLowering, llvm::SIFrameLowering, llvm::ARCFrameLowering, llvm::ARMFrameLowering, llvm::Thumb1FrameLowering, llvm::AVRFrameLowering, llvm::BPFFrameLowering, llvm::CSKYFrameLowering, llvm::HexagonFrameLowering, llvm::LanaiFrameLowering, llvm::LoongArchFrameLowering, llvm::M68kFrameLowering, llvm::Mips16FrameLowering, llvm::MipsSEFrameLowering, llvm::MSP430FrameLowering, llvm::NVPTXFrameLowering, llvm::PPCFrameLowering, llvm::RISCVFrameLowering, llvm::SparcFrameLowering, llvm::SPIRVFrameLowering, llvm::SystemZELFFrameLowering, llvm::SystemZXPLINKFrameLowering, llvm::VEFrameLowering, llvm::WebAssemblyFrameLowering, llvm::X86FrameLowering, and llvm::XCoreFrameLowering.

emitPrologue()

virtual void llvm::TargetFrameLowering::emitPrologue ( MachineFunction &  MF, MachineBasicBlock &  MBB  ) const

pure virtual

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

Implemented in llvm::DirectXFrameLowering, llvm::AArch64FrameLowering, llvm::R600FrameLowering, llvm::SIFrameLowering, llvm::ARCFrameLowering, llvm::ARMFrameLowering, llvm::Thumb1FrameLowering, llvm::AVRFrameLowering, llvm::BPFFrameLowering, llvm::CSKYFrameLowering, llvm::HexagonFrameLowering, llvm::LanaiFrameLowering, llvm::LoongArchFrameLowering, llvm::M68kFrameLowering, llvm::Mips16FrameLowering, llvm::MipsSEFrameLowering, llvm::MSP430FrameLowering, llvm::NVPTXFrameLowering, llvm::PPCFrameLowering, llvm::RISCVFrameLowering, llvm::SparcFrameLowering, llvm::SPIRVFrameLowering, llvm::SystemZELFFrameLowering, llvm::SystemZXPLINKFrameLowering, llvm::VEFrameLowering, llvm::WebAssemblyFrameLowering, llvm::X86FrameLowering, and llvm::XCoreFrameLowering.

emitZeroCallUsedRegs()

virtual void llvm::TargetFrameLowering::emitZeroCallUsedRegs ( BitVector  RegsToZero, MachineBasicBlock &  MBB  ) const

inlinevirtual

emitZeroCallUsedRegs - Zeros out call used registers.

Definition at line 220 of file TargetFrameLowering.h.

enableCalleeSaveSkip()

bool TargetFrameLowering::enableCalleeSaveSkip ( const MachineFunction &  MF ) const

virtual

Returns true if the target can safely skip saving callee-saved registers for noreturn nounwind functions.

Reimplemented in llvm::ARMFrameLowering, and llvm::HexagonFrameLowering.

Definition at line 32 of file TargetFrameLoweringImpl.cpp.

References assert(), llvm::MachineFunction::getFunction(), and llvm::Function::hasFnAttribute().

Referenced by determineCalleeSaves().

enableCFIFixup()

bool TargetFrameLowering::enableCFIFixup ( MachineFunction &  MF ) const

virtual

Returns true if we may need to fix the unwind information for the function.

Reimplemented in llvm::AArch64FrameLowering.

Definition at line 39 of file TargetFrameLoweringImpl.cpp.

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

Referenced by llvm::AArch64FrameLowering::enableCFIFixup(), and llvm::CFIFixup::runOnMachineFunction().

enableShrinkWrapping()

virtual bool llvm::TargetFrameLowering::enableShrinkWrapping ( const MachineFunction &  MF ) const

inlinevirtual

Returns true if the target will correctly handle shrink wrapping.

Reimplemented in llvm::AArch64FrameLowering, llvm::ARMFrameLowering, llvm::Thumb1FrameLowering, llvm::LoongArchFrameLowering, llvm::MipsFrameLowering, llvm::PPCFrameLowering, llvm::RISCVFrameLowering, and llvm::X86FrameLowering.

Definition at line 197 of file TargetFrameLowering.h.

enableStackSlotScavenging()

virtual bool llvm::TargetFrameLowering::enableStackSlotScavenging ( const MachineFunction &  MF ) const

inlinevirtual

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.

Reimplemented in llvm::AArch64FrameLowering.

Definition at line 204 of file TargetFrameLowering.h.

getCalleeSavedSpillSlots()

virtual const SpillSlot * llvm::TargetFrameLowering::getCalleeSavedSpillSlots ( unsigned &  NumEntries ) const

inlinevirtual

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.

Each entry in this array contains a <register,offset> pair, indicating the fixed offset from the incoming stack pointer that each register should be spilled at. If a register is not listed here, the code generator is allowed to spill it anywhere it chooses.

Reimplemented in llvm::ARMFrameLowering, llvm::HexagonFrameLowering, llvm::PPCFrameLowering, and llvm::VEFrameLowering.

Definition at line 184 of file TargetFrameLowering.h.

Referenced by assignCalleeSavedSpillSlots().

getCalleeSaves()

void TargetFrameLowering::getCalleeSaves ( const MachineFunction &  MF, BitVector &  SavedRegs  ) const

virtual

Returns the callee-saved registers as computed by determineCalleeSaves in the BitVector SavedRegs.

Reimplemented in llvm::ARMFrameLowering.

Definition at line 69 of file TargetFrameLoweringImpl.cpp.

References llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineFunction::getFrameInfo(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), Info, llvm::MachineFrameInfo::isCalleeSavedInfoValid(), llvm::BitVector::resize(), llvm::BitVector::set(), and TRI.

Referenced by llvm::ARMFrameLowering::getCalleeSaves().

getDwarfFrameBase()

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

virtual

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

Reimplemented in llvm::NVPTXFrameLowering, llvm::WebAssemblyFrameLowering, and llvm::X86FrameLowering.

Definition at line 165 of file TargetFrameLoweringImpl.cpp.

References llvm::TargetRegisterInfo::getFrameRegister(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), and llvm::TargetFrameLowering::DwarfFrameBase::Register.

Referenced by llvm::DwarfCompileUnit::updateSubprogramScopeDIE().

getFrameIndexReference()

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

virtual

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 in llvm::AArch64FrameLowering, llvm::R600FrameLowering, llvm::SIFrameLowering, llvm::ARMFrameLowering, llvm::CSKYFrameLowering, llvm::HexagonFrameLowering, llvm::LoongArchFrameLowering, llvm::M68kFrameLowering, llvm::MipsSEFrameLowering, llvm::NVPTXFrameLowering, llvm::RISCVFrameLowering, llvm::SparcFrameLowering, llvm::SystemZELFFrameLowering, llvm::VEFrameLowering, and llvm::X86FrameLowering.

Definition at line 49 of file TargetFrameLoweringImpl.cpp.

References llvm::StackOffset::getFixed(), llvm::MachineFunction::getFrameInfo(), llvm::TargetRegisterInfo::getFrameRegister(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineFrameInfo::getOffsetAdjustment(), getOffsetOfLocalArea(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFrameInfo::getStackSize(), and llvm::MachineFunction::getSubtarget().

Referenced by canSpillOnFrameIndexAccess(), llvm::SystemZRegisterInfo::eliminateFrameIndex(), llvm::LoongArchRegisterInfo::eliminateFrameIndex(), emitDebugValueComment(), llvm::SystemZELFFrameLowering::getFrameIndexReference(), getFrameIndexReferencePreferSP(), and getNonLocalFrameIndexReference().

getFrameIndexReferencePreferSP()

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

inlinevirtual

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 in llvm::AArch64FrameLowering, and llvm::X86FrameLowering.

Definition at line 328 of file TargetFrameLowering.h.

References getFrameIndexReference().

getInitialCFAOffset()

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

virtual

Return initial CFA offset value i.e.

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

Reimplemented in llvm::X86FrameLowering.

Definition at line 155 of file TargetFrameLoweringImpl.cpp.

References llvm_unreachable.

getInitialCFARegister()

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

virtual

Return initial CFA register value i.e.

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

Reimplemented in llvm::X86FrameLowering.

Definition at line 160 of file TargetFrameLoweringImpl.cpp.

References llvm_unreachable.

getNonLocalFrameIndexReference()

virtual StackOffset llvm::TargetFrameLowering::getNonLocalFrameIndexReference ( const MachineFunction &  MF, int  FI  ) const

inlinevirtual

getNonLocalFrameIndexReference - This method returns the offset used to reference a frame index location.

The offset can be from either FP/BP/SP based on which base register is returned by llvm.localaddress.

Reimplemented in llvm::AArch64FrameLowering.

Definition at line 338 of file TargetFrameLowering.h.

References getFrameIndexReference().

getOffsetOfLocalArea()

int llvm::TargetFrameLowering::getOffsetOfLocalArea ( ) const

inline

getOffsetOfLocalArea - This method returns the offset of the local area from the stack pointer on entrance to a function.

Definition at line 143 of file TargetFrameLowering.h.

Referenced by llvm::M68kFrameLowering::assignCalleeSavedSpillSlots(), llvm::X86FrameLowering::assignCalleeSavedSpillSlots(), llvm::M68kRegisterInfo::eliminateFrameIndex(), llvm::AVRRegisterInfo::eliminateFrameIndex(), llvm::SystemZXPLINKFrameLowering::emitPrologue(), getFrameIndexReference(), llvm::LoongArchFrameLowering::getFrameIndexReference(), llvm::M68kFrameLowering::getFrameIndexReference(), llvm::MipsSEFrameLowering::getFrameIndexReference(), llvm::NVPTXFrameLowering::getFrameIndexReference(), llvm::RISCVFrameLowering::getFrameIndexReference(), llvm::X86FrameLowering::getFrameIndexReference(), llvm::X86FrameLowering::getFrameIndexReferenceSP(), and llvm::MachineFrameInfo::print().

getStackAlign()

Align llvm::TargetFrameLowering::getStackAlign ( ) const

inline

getStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned on entry to a function.

Typically, this is the largest alignment for any data object in the target.

Definition at line 104 of file TargetFrameLowering.h.

Referenced by llvm::PPCFrameLowering::addScavengingSpillSlot(), assignCalleeSavedSpillSlots(), llvm::HexagonFrameLowering::assignCalleeSavedSpillSlots(), llvm::SystemZXPLINKFrameLowering::assignCalleeSavedSpillSlots(), checkNumAlignedDPRCS2Regs(), llvm::ARMFrameLowering::determineCalleeSaves(), llvm::PPCFrameLowering::determineFrameLayout(), llvm::AArch64FrameLowering::eliminateCallFramePseudoInstr(), llvm::MSP430FrameLowering::eliminateCallFramePseudoInstr(), llvm::XCoreFrameLowering::eliminateCallFramePseudoInstr(), llvm::SIFrameLowering::eliminateCallFramePseudoInstr(), llvm::Thumb1FrameLowering::eliminateCallFramePseudoInstr(), llvm::AVRFrameLowering::eliminateCallFramePseudoInstr(), llvm::RISCVFrameLowering::eliminateCallFramePseudoInstr(), llvm::X86FrameLowering::eliminateCallFramePseudoInstr(), llvm::RISCVFrameLowering::emitEpilogue(), llvm::ARMFrameLowering::emitPrologue(), llvm::RISCVFrameLowering::emitPrologue(), llvm::XCoreFrameLowering::emitPrologue(), llvm::MachineFrameInfo::estimateStackSize(), llvm::X86InstrInfo::foldMemoryOperandImpl(), llvm::VESubtarget::getAdjustedFrameSize(), llvm::RISCVFrameLowering::getFirstSPAdjustAmount(), llvm::LoongArchFrameLowering::getFirstSPAdjustAmount(), getFnStackAlignment(), llvm::SelectionDAG::getReducedAlign(), llvm::X86InstrInfo::getSPAdjust(), llvm::RISCVFrameLowering::getStackSizeWithRVVPadding(), llvm::X86FrameLowering::getWin64EHFrameIndexRef(), llvm::AArch64FrameLowering::getWinEHFuncletFrameSize(), llvm::MipsTargetLowering::HandleByVal(), llvm::X86InstrInfo::loadRegFromStackSlot(), llvm::VETargetLowering::lowerDYNAMIC_STACKALLOC(), LowerDYNAMIC_STACKALLOC(), llvm::SITargetLowering::lowerDYNAMIC_STACKALLOCImpl(), llvm::ARMBaseRegisterInfo::needsFrameBaseReg(), llvm::PPCRegisterInfo::prepareDynamicAlloca(), llvm::HexagonFrameLowering::processFunctionBeforeFrameFinalized(), llvm::HexagonDAGToDAGISel::SelectFrameIndex(), llvm::FunctionLoweringInfo::set(), llvm::TargetRegisterInfo::shouldRealignStack(), and llvm::X86InstrInfo::storeRegToStackSlot().

getStackAlignment()

unsigned llvm::TargetFrameLowering::getStackAlignment ( ) const

inline

getStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned on entry to a function.

Typically, this is the largest alignment for any data object in the target.

Definition at line 99 of file TargetFrameLowering.h.

References llvm::Align::value().

Referenced by llvm::M68kFrameLowering::eliminateCallFramePseudoInstr(), llvm::PPCTargetLowering::getStackProbeSize(), llvm::SystemZTargetLowering::getStackProbeSize(), llvm::MipsSEFrameLowering::hasReservedCallFrame(), and llvm::MipsCallLowering::lowerCall().

getStackGrowthDirection()

StackDirection llvm::TargetFrameLowering::getStackGrowthDirection ( ) const

inline

getStackGrowthDirection - Return the direction the stack grows

Definition at line 93 of file TargetFrameLowering.h.

Referenced by llvm::TargetInstrInfo::getSPAdjust(), llvm::SITargetLowering::lowerDYNAMIC_STACKALLOCImpl(), and llvm::AArch64FrameLowering::processFunctionBeforeFrameFinalized().

getStackIDForScalableVectors()

virtual TargetStackID::Value llvm::TargetFrameLowering::getStackIDForScalableVectors ( ) const

inlinevirtual

Returns the StackID that scalable vectors should be associated with.

Reimplemented in llvm::AArch64FrameLowering, and llvm::RISCVFrameLowering.

Definition at line 435 of file TargetFrameLowering.h.

References llvm::TargetStackID::Default.

Referenced by llvm::SelectionDAG::CreateStackTemporary(), and llvm::FunctionLoweringInfo::set().

getStackThreshold()

virtual uint64_t llvm::TargetFrameLowering::getStackThreshold ( ) const

inlinevirtual

getStackThreshold - Return the maximum stack size

Reimplemented in llvm::PPCFrameLowering.

Definition at line 108 of file TargetFrameLowering.h.

Referenced by llvm::PPCFrameLowering::getStackThreshold().

getTransientStackAlign()

Align llvm::TargetFrameLowering::getTransientStackAlign ( ) const

inline

getTransientStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned at all times, even between calls.

Definition at line 126 of file TargetFrameLowering.h.

Referenced by llvm::AArch64FunctionInfo::AArch64FunctionInfo(), llvm::MachineFrameInfo::estimateStackSize(), and mayCombineMisaligned().

getWinEHParentFrameOffset()

virtual unsigned llvm::TargetFrameLowering::getWinEHParentFrameOffset ( const MachineFunction &  MF ) const

inlinevirtual

Reimplemented in llvm::AArch64FrameLowering, and llvm::X86FrameLowering.

Definition at line 380 of file TargetFrameLowering.h.

References llvm::report_fatal_error().

hasFP()

virtual bool llvm::TargetFrameLowering::hasFP ( const MachineFunction &  MF ) const

pure virtual

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

For most targets this is true only if the function has variable sized allocas or if frame pointer elimination is disabled.

Implemented in llvm::DirectXFrameLowering, llvm::LanaiFrameLowering, llvm::AArch64FrameLowering, llvm::R600FrameLowering, llvm::SIFrameLowering, llvm::ARCFrameLowering, llvm::ARMFrameLowering, llvm::AVRFrameLowering, llvm::BPFFrameLowering, llvm::CSKYFrameLowering, llvm::HexagonFrameLowering, llvm::LoongArchFrameLowering, llvm::M68kFrameLowering, llvm::MipsFrameLowering, llvm::MSP430FrameLowering, llvm::NVPTXFrameLowering, llvm::PPCFrameLowering, llvm::RISCVFrameLowering, llvm::SparcFrameLowering, llvm::SPIRVFrameLowering, llvm::SystemZELFFrameLowering, llvm::SystemZXPLINKFrameLowering, llvm::VEFrameLowering, llvm::WebAssemblyFrameLowering, llvm::X86FrameLowering, and llvm::XCoreFrameLowering.

Referenced by allocateScavengingFrameIndexesNearIncomingSP(), llvm::CodeViewDebug::beginFunctionImpl(), canSimplifyCallFramePseudos(), llvm::LanaiRegisterInfo::eliminateFrameIndex(), estimateRSStackSizeLimit(), llvm::AVRRegisterInfo::getFrameRegister(), llvm::CSKYRegisterInfo::getFrameRegister(), llvm::LoongArchRegisterInfo::getFrameRegister(), llvm::M68kRegisterInfo::getFrameRegister(), llvm::RISCVRegisterInfo::getFrameRegister(), llvm::SystemZRegisterInfo::getFrameRegister(), llvm::X86TargetLowering::getRegisterByName(), llvm::MipsRegisterInfo::getRegPressureLimit(), llvm::MipsRegisterInfo::getReservedRegs(), llvm::SystemZRegisterInfo::getReservedRegs(), and hasReservedCallFrame().

hasReservedCallFrame()

virtual bool llvm::TargetFrameLowering::hasReservedCallFrame ( const MachineFunction &  MF ) const

inlinevirtual

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 in llvm::AArch64FrameLowering, llvm::ARMFrameLowering, llvm::Thumb1FrameLowering, llvm::AVRFrameLowering, llvm::CSKYFrameLowering, llvm::HexagonFrameLowering, llvm::LoongArchFrameLowering, llvm::M68kFrameLowering, llvm::Mips16FrameLowering, llvm::MipsSEFrameLowering, llvm::MSP430FrameLowering, llvm::RISCVFrameLowering, llvm::SparcFrameLowering, llvm::SystemZFrameLowering, llvm::VEFrameLowering, llvm::WebAssemblyFrameLowering, and llvm::X86FrameLowering.

Definition at line 295 of file TargetFrameLowering.h.

References hasFP().

Referenced by llvm::MipsRegisterInfo::canRealignStack(), canSimplifyCallFramePseudos(), llvm::MipsFrameLowering::eliminateCallFramePseudoInstr(), llvm::XCoreFrameLowering::eliminateCallFramePseudoInstr(), llvm::SIFrameLowering::eliminateCallFramePseudoInstr(), and llvm::MachineFrameInfo::estimateStackSize().

inlineStackProbe()

virtual void llvm::TargetFrameLowering::inlineStackProbe ( MachineFunction &  MF, MachineBasicBlock &  PrologueMBB  ) const

inlinevirtual

Replace a StackProbe stub (if any) with the actual probe code inline.

Reimplemented in llvm::PPCFrameLowering, llvm::SystemZELFFrameLowering, llvm::SystemZXPLINKFrameLowering, and llvm::X86FrameLowering.

Definition at line 238 of file TargetFrameLowering.h.

isProfitableForNoCSROpt()

virtual bool llvm::TargetFrameLowering::isProfitableForNoCSROpt ( const Function &  F ) const

inlinevirtual

Check if the no-CSR optimisation is profitable for the given function.

Reimplemented in llvm::ARMFrameLowering.

Definition at line 454 of file TargetFrameLowering.h.

Referenced by determineCalleeSaves().

isSafeForNoCSROpt()

bool TargetFrameLowering::isSafeForNoCSROpt ( const Function &  F )

static

Check if given function is safe for not having callee saved registers.

This is used when interprocedural register allocation is enabled.

Definition at line 143 of file TargetFrameLoweringImpl.cpp.

References F.

Referenced by determineCalleeSaves().

isStackIdSafeForLocalArea()

virtual bool llvm::TargetFrameLowering::isStackIdSafeForLocalArea ( unsigned  StackId ) const

inlinevirtual

This method returns whether or not it is safe for an object with the given stack id to be bundled into the local area.

Reimplemented in llvm::AArch64FrameLowering, and llvm::RISCVFrameLowering.

Definition at line 136 of file TargetFrameLowering.h.

isStackRealignable()

bool llvm::TargetFrameLowering::isStackRealignable ( ) const

inline

isStackRealignable - This method returns whether the stack can be realigned.

Definition at line 130 of file TargetFrameLowering.h.

Referenced by llvm::FunctionLoweringInfo::set().

isSupportedStackID()

virtual bool llvm::TargetFrameLowering::isSupportedStackID ( TargetStackID::Value  ID ) const

inlinevirtual

Reimplemented in llvm::AArch64FrameLowering, llvm::SIFrameLowering, llvm::RISCVFrameLowering, and llvm::WebAssemblyFrameLowering.

Definition at line 439 of file TargetFrameLowering.h.

References llvm::TargetStackID::Default, and llvm::TargetStackID::NoAlloc.

Referenced by llvm::MIRParserImpl::initializeFrameInfo(), and llvm::WebAssemblyFrameLowering::isSupportedStackID().

keepFramePointer()

virtual bool llvm::TargetFrameLowering::keepFramePointer ( const MachineFunction &  MF ) const

inlinevirtual

Return true if the target wants to keep the frame pointer regardless of the function attribute "frame-pointer".

Reimplemented in llvm::ARMFrameLowering.

Definition at line 281 of file TargetFrameLowering.h.

Referenced by llvm::TargetOptions::DisableFramePointerElim().

needsFrameIndexResolution()

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

virtual

Reimplemented in llvm::M68kFrameLowering, and llvm::X86FrameLowering.

Definition at line 64 of file TargetFrameLoweringImpl.cpp.

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

orderFrameObjects()

virtual void llvm::TargetFrameLowering::orderFrameObjects ( const MachineFunction &  MF, SmallVectorImpl< int > &  objectsToAllocate  ) const

inlinevirtual

Order the symbols in the local stack frame.

The list of objects that we want to order is in objectsToAllocate as indices into the MachineFrameInfo. The array can be reordered in any way upon return. The contents of the array, however, may not be modified (i.e. only their order may be changed). By default, just maintain the original order.

Reimplemented in llvm::AArch64FrameLowering, llvm::SystemZELFFrameLowering, and llvm::X86FrameLowering.

Definition at line 406 of file TargetFrameLowering.h.

processFunctionBeforeFrameFinalized()

virtual void llvm::TargetFrameLowering::processFunctionBeforeFrameFinalized ( MachineFunction &  MF, RegScavenger *  RS = nullptr  ) const

inlinevirtual

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 in llvm::AArch64FrameLowering, llvm::ARCFrameLowering, llvm::LoongArchFrameLowering, llvm::RISCVFrameLowering, llvm::SystemZELFFrameLowering, llvm::SystemZXPLINKFrameLowering, llvm::X86FrameLowering, llvm::SIFrameLowering, llvm::HexagonFrameLowering, llvm::MSP430FrameLowering, llvm::PPCFrameLowering, and llvm::XCoreFrameLowering.

Definition at line 369 of file TargetFrameLowering.h.

processFunctionBeforeFrameIndicesReplaced()

virtual void llvm::TargetFrameLowering::processFunctionBeforeFrameIndicesReplaced ( MachineFunction &  MF, RegScavenger *  RS = nullptr  ) const

inlinevirtual

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

This method is optional.

Reimplemented in llvm::AArch64FrameLowering, llvm::X86FrameLowering, and llvm::SIFrameLowering.

Definition at line 377 of file TargetFrameLowering.h.

resetCFIToInitialState()

virtual void llvm::TargetFrameLowering::resetCFIToInitialState ( MachineBasicBlock &  MBB ) const

inlinevirtual

Emit CFI instructions that recreate the state of the unwind information upon fucntion entry.

Reimplemented in llvm::AArch64FrameLowering.

Definition at line 235 of file TargetFrameLowering.h.

Referenced by llvm::CFIFixup::runOnMachineFunction().

restoreCalleeSavedRegisters()

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

inlinevirtual

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 in llvm::SystemZELFFrameLowering, llvm::SystemZXPLINKFrameLowering, llvm::AArch64FrameLowering, llvm::ARCFrameLowering, llvm::ARMFrameLowering, llvm::Thumb1FrameLowering, llvm::AVRFrameLowering, llvm::CSKYFrameLowering, llvm::HexagonFrameLowering, llvm::M68kFrameLowering, llvm::Mips16FrameLowering, llvm::MSP430FrameLowering, llvm::PPCFrameLowering, llvm::RISCVFrameLowering, llvm::X86FrameLowering, and llvm::XCoreFrameLowering.

Definition at line 272 of file TargetFrameLowering.h.

Referenced by insertCSRRestores().

spillCalleeSavedRegisters()

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

inlinevirtual

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 in llvm::SystemZELFFrameLowering, llvm::SystemZXPLINKFrameLowering, llvm::AArch64FrameLowering, llvm::ARCFrameLowering, llvm::ARMFrameLowering, llvm::Thumb1FrameLowering, llvm::AVRFrameLowering, llvm::CSKYFrameLowering, llvm::HexagonFrameLowering, llvm::LoongArchFrameLowering, llvm::M68kFrameLowering, llvm::Mips16FrameLowering, llvm::MipsSEFrameLowering, llvm::MSP430FrameLowering, llvm::PPCFrameLowering, llvm::RISCVFrameLowering, llvm::X86FrameLowering, and llvm::XCoreFrameLowering.

Definition at line 258 of file TargetFrameLowering.h.

Referenced by insertCSRSaves().

stackProbeFunctionModifiesSP()

virtual bool llvm::TargetFrameLowering::stackProbeFunctionModifiesSP ( ) const

inlinevirtual

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

Reimplemented in llvm::X86FrameLowering.

Definition at line 242 of file TargetFrameLowering.h.

targetHandlesStackFrameRounding()

virtual bool llvm::TargetFrameLowering::targetHandlesStackFrameRounding ( ) const

inlinevirtual

targetHandlesStackFrameRounding - Returns true if the target is responsible for rounding up the stack frame (probably at emitPrologue time).

Reimplemented in llvm::HexagonFrameLowering, llvm::PPCFrameLowering, and llvm::SparcFrameLowering.

Definition at line 192 of file TargetFrameLowering.h.

---

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

• include/llvm/CodeGen/TargetFrameLowering.h
• lib/CodeGen/TargetFrameLoweringImpl.cpp