#include "Target/RISCV/RISCVFrameLowering.h"

Inheritance diagram for llvm::RISCVFrameLowering:

Public Member Functions
	RISCVFrameLowering (const RISCVSubtarget &STI)

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

uint64_t	getStackSizeWithRVVPadding (const MachineFunction &MF) const

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.

void	determineCalleeSaves (MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS) const override
	This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved.

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.

bool	hasFP (const MachineFunction &MF) const override
	hasFP - Return true if the specified function should have a dedicated frame pointer register.

bool	hasBP (const MachineFunction &MF) const

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.

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).

bool	assignCalleeSavedSpillSlots (MachineFunction &MF, const TargetRegisterInfo *TRI, std::vector< CalleeSavedInfo > &CSI, unsigned &MinCSFrameIndex, unsigned &MaxCSFrameIndex) const override
	assignCalleeSavedSpillSlots - Allows target to override spill slot assignment logic.

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().

uint64_t	getFirstSPAdjustAmount (const MachineFunction &MF) const

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.

bool	isSupportedStackID (TargetStackID::Value ID) const override

TargetStackID::Value	getStackIDForScalableVectors () const override
	Returns the StackID that scalable vectors should be associated with.

bool	isStackIdSafeForLocalArea (unsigned StackId) const override
	This method returns whether or not it is safe for an object with the given stack id to be bundled into the local area.

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.

Protected Attributes
const RISCVSubtarget &	STI

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 22 of file RISCVFrameLowering.h.

Constructor & Destructor Documentation

◆ RISCVFrameLowering()

RISCVFrameLowering::RISCVFrameLowering ( const RISCVSubtarget & STI )

explicit

Definition at line 38 of file RISCVFrameLowering.cpp.

Member Function Documentation

◆ assignCalleeSavedSpillSlots()

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

overridevirtual

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 from llvm::TargetFrameLowering.

Definition at line 1398 of file RISCVFrameLowering.cpp.

References llvm::alignTo(), assert(), llvm::MachineFrameInfo::CreateFixedSpillStackObject(), llvm::MachineFrameInfo::CreateStackObject(), llvm::find_if(), FixedCSRFIMap, llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), getLibCallID(), getMaxPushPopReg(), llvm::TargetRegisterInfo::getMinimalPhysRegClass(), getPushPopEncodingAndNum(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::TargetRegisterInfo::getSpillAlign(), llvm::TargetRegisterInfo::getSpillSize(), llvm::TargetFrameLowering::getStackAlign(), llvm::MachineFunction::getSubtarget(), llvm::RISCVSubtarget::getXLen(), llvm::Offset, P, Size, and STI.

◆ canUseAsEpilogue()

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

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1671 of file RISCVFrameLowering.cpp.

References llvm::MachineBasicBlock::getFallThrough(), llvm::MachineFunction::getInfo(), llvm::MachineBasicBlock::getParent(), llvm::MachineBasicBlock::isReturnBlock(), MBB, llvm::MachineBasicBlock::size(), llvm::MachineBasicBlock::succ_begin(), llvm::MachineBasicBlock::succ_empty(), llvm::MachineBasicBlock::succ_size(), and llvm::RISCVMachineFunctionInfo::useSaveRestoreLibCalls().

◆ canUseAsPrologue()

bool RISCVFrameLowering::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 1654 of file RISCVFrameLowering.cpp.

References llvm::RegScavenger::enterBasicBlock(), llvm::MachineFunction::getInfo(), llvm::MachineBasicBlock::getParent(), llvm::RegScavenger::isRegUsed(), MBB, and llvm::RISCVMachineFunctionInfo::useSaveRestoreLibCalls().

◆ determineCalleeSaves()

void RISCVFrameLowering::determineCalleeSaves	(	MachineFunction &	MF,
		BitVector &	SavedRegs,
		RegScavenger *	RS
	)		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 1034 of file RISCVFrameLowering.cpp.

References llvm::TargetFrameLowering::determineCalleeSaves(), llvm::RISCVABI::getBPReg(), llvm::MachineFunction::getInfo(), hasBP(), hasFP(), llvm::BitVector::set(), and llvm::BitVector::test().

◆ eliminateCallFramePseudoInstr()

MachineBasicBlock::iterator RISCVFrameLowering::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 1289 of file RISCVFrameLowering.cpp.

References llvm::RISCVRegisterInfo::adjustReg(), llvm::TargetFrameLowering::alignSPAdjust(), DL, llvm::MachineBasicBlock::erase(), llvm::StackOffset::getFixed(), llvm::RISCVSubtarget::getRegisterInfo(), llvm::TargetFrameLowering::getStackAlign(), hasReservedCallFrame(), MBB, MI, llvm::MachineInstr::NoFlags, and STI.

◆ emitEpilogue()

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

overridevirtual

Implements llvm::TargetFrameLowering.

Definition at line 758 of file RISCVFrameLowering.cpp.

References llvm::RISCVRegisterInfo::adjustReg(), llvm::alignDown(), assert(), llvm::MachineBasicBlock::begin(), DL, emitSCSEpilogue(), llvm::MachineBasicBlock::empty(), llvm::MachineBasicBlock::end(), llvm::MachineInstr::FrameDestroy, llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::Function::getCallingConv(), getFirstSPAdjustAmount(), llvm::MachineBasicBlock::getFirstTerminator(), llvm::StackOffset::getFixed(), getFPReg(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineBasicBlock::getLastNonDebugInstr(), llvm::RISCVSubtarget::getRegisterInfo(), getSPReg(), llvm::TargetFrameLowering::getStackAlign(), getStackSizeWithRVVPadding(), getUnmanagedCSI(), llvm::CallingConv::GHC, hasFP(), hasReservedCallFrame(), llvm::MachineFrameInfo::hasVarSizedObjects(), MBB, MBBI, llvm::MachineBasicBlock::size(), and STI.

◆ emitPrologue()

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

overridevirtual

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

Implements llvm::TargetFrameLowering.

Definition at line 525 of file RISCVFrameLowering.cpp.

References llvm::MachineInstrBuilder::addCFIIndex(), llvm::MachineFunction::addFrameInst(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::MachineFrameInfo::adjustsStack(), llvm::alignDown(), llvm::alignTo(), assert(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::MCCFIInstruction::cfiDefCfa(), llvm::MCCFIInstruction::cfiDefCfaOffset(), createDefCFAExpression(), llvm::MCCFIInstruction::createOffset(), llvm::MachineRegisterInfo::createVirtualRegister(), llvm::LLVMContext::diagnose(), DL, emitSCSPrologue(), llvm::MachineBasicBlock::end(), llvm::MachineInstr::FrameSetup, llvm::RISCVABI::getBPReg(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::Function::getCallingConv(), llvm::Function::getContext(), getFirstSPAdjustAmount(), llvm::StackOffset::getFixed(), getFPReg(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::RISCVSubtarget::getInstrInfo(), getLibCallID(), llvm::MachineFrameInfo::getMaxAlign(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineFunction::getRegInfo(), llvm::RISCVSubtarget::getRegisterInfo(), getRVVCalleeSavedInfo(), getSPReg(), llvm::TargetFrameLowering::getStackAlign(), llvm::MachineFrameInfo::getStackID(), getStackSizeWithRVVPadding(), getUnmanagedCSI(), llvm::RISCVSubtarget::getXLen(), llvm::CallingConv::GHC, hasBP(), hasFP(), llvm::RISCVSubtarget::isRegisterReservedByUser(), llvm::MachineRegisterInfo::isReserved(), llvm::Log2(), MBB, MBBI, llvm::Offset, llvm::TargetStackID::ScalableVector, llvm::MachineInstrBuilder::setMIFlag(), llvm::size(), STI, TII, and llvm::Align::value().

◆ enableShrinkWrapping()

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

overridevirtual

Returns true if the target will correctly handle shrink wrapping.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1646 of file RISCVFrameLowering.cpp.

References llvm::MachineFunction::getFunction(), and llvm::Function::hasOptNone().

◆ getFirstSPAdjustAmount()

uint64_t RISCVFrameLowering::getFirstSPAdjustAmount ( const MachineFunction & MF ) const

Definition at line 1331 of file RISCVFrameLowering.cpp.

References llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::TargetFrameLowering::getStackAlign(), getStackSizeWithRVVPadding(), llvm::RISCVSubtarget::getXLen(), llvm::RISCVSubtarget::hasStdExtCOrZca(), llvm::RISCVSubtarget::is64Bit(), STI, and llvm::Align::value().

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

◆ getFrameIndexReference()

StackOffset RISCVFrameLowering::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 862 of file RISCVFrameLowering.cpp.

References assert(), llvm::TargetStackID::Default, llvm::StackOffset::get(), llvm::RISCVABI::getBPReg(), llvm::MachineFrameInfo::getCalleeSavedInfo(), getFirstSPAdjustAmount(), llvm::StackOffset::getFixed(), getFPReg(), llvm::MachineFunction::getFrameInfo(), llvm::TargetRegisterInfo::getFrameRegister(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineFrameInfo::getOffsetAdjustment(), llvm::TargetFrameLowering::getOffsetOfLocalArea(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::StackOffset::getScalable(), llvm::MachineFrameInfo::getStackID(), llvm::MachineFrameInfo::getStackSize(), getStackSizeWithRVVPadding(), llvm::MachineFunction::getSubtarget(), getUnmanagedCSI(), hasBP(), llvm::TargetRegisterInfo::hasStackRealignment(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::Offset, llvm::TargetStackID::ScalableVector, and STI.

◆ getStackIDForScalableVectors()

TargetStackID::Value RISCVFrameLowering::getStackIDForScalableVectors ( ) const

overridevirtual

Returns the StackID that scalable vectors should be associated with.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1713 of file RISCVFrameLowering.cpp.

References llvm::TargetStackID::ScalableVector.

◆ getStackSizeWithRVVPadding()

uint64_t RISCVFrameLowering::getStackSizeWithRVVPadding ( const MachineFunction & MF ) const

Definition at line 368 of file RISCVFrameLowering.cpp.

References llvm::alignTo(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::TargetFrameLowering::getStackAlign(), and llvm::MachineFrameInfo::getStackSize().

Referenced by emitEpilogue(), emitPrologue(), getFirstSPAdjustAmount(), and getFrameIndexReference().

◆ hasBP()

bool RISCVFrameLowering::hasBP ( const MachineFunction & MF ) const

Definition at line 321 of file RISCVFrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getMaxCallFrameSize(), llvm::RISCVSubtarget::getRegisterInfo(), hasReservedCallFrame(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFrameInfo::isMaxCallFrameSizeComputed(), STI, and TRI.

Referenced by determineCalleeSaves(), emitPrologue(), getFrameIndexReference(), and llvm::RISCVRegisterInfo::getReservedRegs().

◆ hasFP()

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

overridevirtual

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 312 of file RISCVFrameLowering.cpp.

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

Referenced by determineCalleeSaves(), emitEpilogue(), emitPrologue(), llvm::RISCVRegisterInfo::getReservedRegs(), hasReservedCallFrame(), and llvm::RISCVRegisterInfo::needsFrameBaseReg().

◆ hasReservedCallFrame()

bool RISCVFrameLowering::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 1283 of file RISCVFrameLowering.cpp.

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

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

◆ isStackIdSafeForLocalArea()

bool llvm::RISCVFrameLowering::isStackIdSafeForLocalArea ( unsigned StackId ) const

inlineoverridevirtual

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 from llvm::TargetFrameLowering.

Definition at line 77 of file RISCVFrameLowering.h.

References llvm::TargetStackID::ScalableVector.

◆ isSupportedStackID()

bool RISCVFrameLowering::isSupportedStackID ( TargetStackID::Value ID ) const

overridevirtual

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1700 of file RISCVFrameLowering.cpp.

References llvm::TargetStackID::Default, llvm_unreachable, llvm::TargetStackID::NoAlloc, llvm::TargetStackID::ScalableVector, llvm::TargetStackID::SGPRSpill, and llvm::TargetStackID::WasmLocal.

◆ processFunctionBeforeFrameFinalized()

void RISCVFrameLowering::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 1218 of file RISCVFrameLowering.cpp.

References llvm::RegScavenger::addScavengingFrameIndex(), llvm::MachineFrameInfo::CreateStackObject(), llvm::TargetStackID::Default, llvm::MachineFrameInfo::ensureMaxAlignment(), estimateFunctionSizeInBytes(), llvm::MachineFrameInfo::estimateStackSize(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectSize(), getScavSlotsNumForRVV(), llvm::MachineFrameInfo::getStackID(), llvm::MachineFunction::getSubtarget(), hasRVVFrameObject(), I, Info, Size, and TII.

◆ restoreCalleeSavedRegisters()

bool RISCVFrameLowering::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 1578 of file RISCVFrameLowering.cpp.

References llvm::MachineInstrBuilder::addDef(), llvm::MachineInstrBuilder::addExternalSymbol(), llvm::MachineInstrBuilder::addImm(), assert(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), DL, llvm::ArrayRef< T >::empty(), llvm::MachineBasicBlock::end(), FixedCSRFIMap, llvm::MachineInstr::FrameDestroy, llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineBasicBlock::getParent(), getRestoreLibCallName(), llvm::RISCVMachineFunctionInfo::getRVPushRegs(), llvm::RISCVMachineFunctionInfo::getRVPushRlist(), getRVVCalleeSavedInfo(), llvm::MachineFunction::getSubtarget(), getUnmanagedCSI(), llvm::RegState::ImplicitDefine, llvm::RISCVZC::INVALID_RLIST, llvm::RISCVMachineFunctionInfo::isPushable(), llvm::HexagonInstrInfo::loadRegFromStackSlot(), MBB, MI, llvm::RISCVII::MO_CALL, llvm::MachineInstrBuilder::setMIFlag(), TII, and TRI.

◆ spillCalleeSavedRegisters()

bool RISCVFrameLowering::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 1474 of file RISCVFrameLowering.cpp.

References llvm::MachineInstrBuilder::addExternalSymbol(), llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addUse(), llvm::BuildMI(), DL, llvm::ArrayRef< T >::empty(), llvm::MachineBasicBlock::end(), FixedCSRFIMap, llvm::MachineInstr::FrameSetup, llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineBasicBlock::getParent(), llvm::RISCVMachineFunctionInfo::getRVPushRegs(), llvm::RISCVMachineFunctionInfo::getRVPushRlist(), getRVVCalleeSavedInfo(), getSpillLibCallName(), llvm::MachineFunction::getSubtarget(), getUnmanagedCSI(), llvm::RegState::Implicit, llvm::MachineBasicBlock::isLiveIn(), llvm::RISCVMachineFunctionInfo::isPushable(), MBB, MI, llvm::RISCVII::MO_CALL, llvm::MachineInstrBuilder::setMIFlag(), llvm::HexagonInstrInfo::storeRegToStackSlot(), TII, and TRI.

Member Data Documentation

◆ STI

const RISCVSubtarget& llvm::RISCVFrameLowering::STI

protected

Definition at line 84 of file RISCVFrameLowering.h.

Referenced by assignCalleeSavedSpillSlots(), eliminateCallFramePseudoInstr(), emitEpilogue(), emitPrologue(), getFirstSPAdjustAmount(), getFrameIndexReference(), and hasBP().

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

lib/Target/RISCV/RISCVFrameLowering.h
lib/Target/RISCV/RISCVFrameLowering.cpp

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ RISCVFrameLowering()

Member Function Documentation

◆ assignCalleeSavedSpillSlots()

◆ canUseAsEpilogue()

◆ canUseAsPrologue()

◆ determineCalleeSaves()

◆ eliminateCallFramePseudoInstr()

◆ emitEpilogue()

◆ emitPrologue()

◆ enableShrinkWrapping()

◆ getFirstSPAdjustAmount()

◆ getFrameIndexReference()

◆ getStackIDForScalableVectors()

◆ getStackSizeWithRVVPadding()

◆ hasBP()

◆ hasFP()

◆ hasReservedCallFrame()

◆ isStackIdSafeForLocalArea()

◆ isSupportedStackID()

◆ processFunctionBeforeFrameFinalized()

◆ restoreCalleeSavedRegisters()

◆ spillCalleeSavedRegisters()

Member Data Documentation

◆ STI