#include <AArch64FrameLowering.h>

Inheritance diagram for llvm::AArch64FrameLowering:

Collaboration diagram for llvm::AArch64FrameLowering:

Public Member Functions
	AArch64FrameLowering (const AArch64Subtarget &sti)

virtual void	emitPrologue (MachineFunction &MF) const

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

void	splitSPAdjustments (uint64_t Total, uint64_t &Initial, uint64_t &Residual) const

int64_t	resolveFrameIndexReference (MachineFunction &MF, int FrameIndex, unsigned &FrameReg, int SPAdj, bool IsCalleeSaveOp) const

virtual void	processFunctionBeforeCalleeSavedScan (MachineFunction &MF, RegScavenger *RS) const

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

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

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

bool	determinePrologueDeath (MachineBasicBlock &MBB, unsigned Reg) const

void	emitFrameMemOps (bool isStore, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, const std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI, const LoadStoreMethod PossibleClasses[], unsigned NumClasses) const

virtual bool	hasFP (const MachineFunction &MF) const

virtual bool	useFPForAddressing (const MachineFunction &MF) const

virtual bool	hasReservedCallFrame (const MachineFunction &MF) const
	On AA. More...

Public Member Functions inherited from llvm::TargetFrameLowering
	TargetFrameLowering (StackDirection D, unsigned StackAl, int LAO, unsigned TransAl=1, bool StackReal=true)

virtual	~TargetFrameLowering ()

StackDirection	getStackGrowthDirection () const

unsigned	getStackAlignment () const

unsigned	getTransientStackAlignment () const

bool	isStackRealignable () const

int	getOffsetOfLocalArea () const

virtual bool	isFPCloseToIncomingSP () const

virtual const SpillSlot *	getCalleeSavedSpillSlots (unsigned &NumEntries) const

virtual bool	targetHandlesStackFrameRounding () const

virtual void	adjustForSegmentedStacks (MachineFunction &MF) const

virtual void	adjustForHiPEPrologue (MachineFunction &MF) const

virtual bool	canSimplifyCallFramePseudos (const MachineFunction &MF) const

virtual int	getFrameIndexOffset (const MachineFunction &MF, int FI) const

virtual int	getFrameIndexReference (const MachineFunction &MF, int FI, unsigned &FrameReg) const

virtual void	processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS=NULL) const

Protected Attributes
const AArch64Subtarget &	STI

Additional Inherited Members
Public Types inherited from llvm::TargetFrameLowering
enum	StackDirection { StackGrowsUp, StackGrowsDown }

Detailed Description

Definition at line 24 of file AArch64FrameLowering.h.

Constructor & Destructor Documentation

llvm::AArch64FrameLowering::AArch64FrameLowering ( const AArch64Subtarget & sti )

inlineexplicit

Definition at line 43 of file AArch64FrameLowering.h.

Member Function Documentation

bool AArch64FrameLowering::determinePrologueDeath	(	MachineBasicBlock &	MBB,
		unsigned	Reg
	)		const

If the register is X30 (i.e. LR) and the return address is used in the function then the callee-save store doesn't actually kill the register, otherwise it does.

Definition at line 407 of file AArch64FrameLowering.cpp.

References llvm::MachineBasicBlock::addLiveIn(), llvm::MachineFunction::getFrameInfo(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getRegInfo(), llvm::MachineRegisterInfo::isLiveIn(), and llvm::MachineFrameInfo::isReturnAddressTaken().

Referenced by emitFrameMemOps().

void AArch64FrameLowering::eliminateCallFramePseudoInstr	(	MachineFunction &	MF,
		MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MI
	)		const

virtual

eliminateCallFramePseudoInstr - 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.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 598 of file AArch64FrameLowering.cpp.

References Align(), llvm::emitSPUpdate(), llvm::MachineBasicBlock::erase(), llvm::TargetMachine::getInstrInfo(), llvm::TargetFrameLowering::getStackAlignment(), llvm::MachineFunction::getTarget(), hasReservedCallFrame(), llvm::RoundUpToAlignment(), and TII.

void AArch64FrameLowering::emitEpilogue	(	MachineFunction &	MF,
		MachineBasicBlock &	MBB
	)		const

virtual

Implements llvm::TargetFrameLowering.

Definition at line 193 of file AArch64FrameLowering.cpp.

void AArch64FrameLowering::emitFrameMemOps	(	bool	isStore,
		MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MI,
		const std::vector< CalleeSavedInfo > &	CSI,
		const TargetRegisterInfo *	TRI,
		const LoadStoreMethod	PossibleClasses[],
		unsigned	NumClasses
	)		const

This function emits the loads or stores required during prologue and epilogue as efficiently as possible.

The operations involved in setting up and tearing down the frame are similar enough to warrant a shared function, particularly as discrepancies between the two would be disastrous.

Definition at line 424 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addFrameIndex(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addMemOperand(), llvm::BuildMI(), llvm::TargetRegisterClass::contains(), llvm::RegState::Define, determinePrologueDeath(), llvm::MachineBasicBlock::findDebugLoc(), llvm::MachineInstr::FrameSetup, llvm::MCInstrInfo::get(), llvm::MachinePointerInfo::getFixedStack(), llvm::MachineFunction::getFrameInfo(), llvm::TargetMachine::getInstrInfo(), llvm::getKillRegState(), llvm::MachineFunction::getMachineMemOperand(), llvm::MachineFrameInfo::getObjectAlignment(), llvm::MachineBasicBlock::getParent(), getReg(), llvm::TargetRegisterClass::getSize(), llvm::MachineFunction::getTarget(), llvm::MachineMemOperand::MOLoad, llvm::MachineMemOperand::MOStore, llvm::MachineInstrBuilder::setMIFlags(), and TII.

Referenced by restoreCalleeSavedRegisters(), and spillCalleeSavedRegisters().

void AArch64FrameLowering::emitPrologue ( MachineFunction & MF ) const

virtual

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

Implements llvm::TargetFrameLowering.

Definition at line 47 of file AArch64FrameLowering.cpp.

References llvm::MachineModuleInfo::addFrameInst(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::MCCFIInstruction::createDefCfa(), llvm::MCCFIInstruction::createOffset(), llvm::MCContext::CreateTempSymbol(), llvm::emitRegUpdate(), llvm::emitSPUpdate(), llvm::MachineInstr::FrameSetup, llvm::MachineFunction::front(), llvm::MCInstrInfo::get(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineModuleInfo::getContext(), llvm::MCRegisterInfo::getDwarfRegNum(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getInstrInfo(), llvm::MachineFunction::getMMI(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MCContext::getRegisterInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getTarget(), llvm::MachineModuleInfo::hasDebugInfo(), hasFP(), I, MRI, llvm::Function::needsUnwindTableEntry(), llvm::TargetOpcode::PROLOG_LABEL, llvm::AArch64MachineFunctionInfo::setFramePointerOffset(), llvm::AArch64MachineFunctionInfo::setInitialStackAdjust(), llvm::MachineFrameInfo::setOffsetAdjustment(), splitSPAdjustments(), and TII.

bool AArch64FrameLowering::hasFP ( const MachineFunction & MF ) const

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.

Implements llvm::TargetFrameLowering.

Definition at line 565 of file AArch64FrameLowering.cpp.

References llvm::TargetOptions::DisableFramePointerElim(), llvm::MachineFunction::getFrameInfo(), llvm::TargetMachine::getRegisterInfo(), llvm::MachineFunction::getTarget(), llvm::MachineFrameInfo::hasCalls(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFrameInfo::isFrameAddressTaken(), llvm::TargetRegisterInfo::needsStackRealignment(), and llvm::TargetMachine::Options.

Referenced by emitPrologue(), hasReservedCallFrame(), and processFunctionBeforeCalleeSavedScan().

bool AArch64FrameLowering::hasReservedCallFrame ( const MachineFunction & MF ) const

virtual

On AA.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 589 of file AArch64FrameLowering.cpp.

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

Referenced by eliminateCallFramePseudoInstr(), and processFunctionBeforeCalleeSavedScan().

void AArch64FrameLowering::processFunctionBeforeCalleeSavedScan	(	MachineFunction &	MF,
		RegScavenger *	RS
	)		const

virtual

processFunctionBeforeCalleeSavedScan - This method is called immediately before PrologEpilogInserter scans the physical registers used to determine what callee saved registers should be spilled. This method is optional.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 354 of file AArch64FrameLowering.cpp.

References llvm::RegScavenger::addScavengingFrameIndex(), llvm::MachineFrameInfo::adjustsStack(), llvm::MachineFrameInfo::CreateStackObject(), llvm::AArch64InstrInfo::estimateRSStackLimit(), llvm::MachineFrameInfo::estimateStackSize(), llvm::TargetRegisterClass::getAlignment(), llvm::AArch64RegisterInfo::getCalleeSavedRegs(), llvm::MachineFunction::getFrameInfo(), llvm::TargetMachine::getInstrInfo(), llvm::MachineFunction::getRegInfo(), llvm::TargetMachine::getRegisterInfo(), llvm::TargetRegisterClass::getSize(), llvm::MachineFunction::getTarget(), hasFP(), hasReservedCallFrame(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineRegisterInfo::isPhysRegUsed(), llvm::MachineRegisterInfo::setPhysRegUsed(), and TII.

int64_t AArch64FrameLowering::resolveFrameIndexReference	(	MachineFunction &	MF,
		int	FrameIndex,
		unsigned &	FrameReg,
		int	SPAdj,
		bool	IsCalleeSaveOp
	)		const

Definition at line 320 of file AArch64FrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), llvm::AArch64MachineFunctionInfo::getFramePointerOffset(), llvm::MachineFunction::getInfo(), llvm::AArch64MachineFunctionInfo::getInitialStackAdjust(), llvm::MachineFrameInfo::getObjectOffset(), and useFPForAddressing().

Referenced by llvm::AArch64RegisterInfo::eliminateFrameIndex().

bool AArch64FrameLowering::restoreCalleeSavedRegisters	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MI,
		const std::vector< CalleeSavedInfo > &	CSI,
		const TargetRegisterInfo *	TRI
	)		const

virtual

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(). Returns false otherwise.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 544 of file AArch64FrameLowering.cpp.

References llvm::array_lengthof(), and emitFrameMemOps().

bool AArch64FrameLowering::spillCalleeSavedRegisters	(	MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MI,
		const std::vector< CalleeSavedInfo > &	CSI,
		const TargetRegisterInfo *	TRI
	)		const

virtual

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 524 of file AArch64FrameLowering.cpp.

References llvm::array_lengthof(), and emitFrameMemOps().