#include "Target/Hexagon/HexagonFrameLowering.h"

Inheritance diagram for llvm::HexagonFrameLowering:

Public Member Functions
	HexagonFrameLowering ()

void	orderFrameObjects (const MachineFunction &MF, SmallVectorImpl< int > &ObjectsToAllocate) const override
	Order the symbols in the local stack frame.

void	emitPrologue (MachineFunction &MF, MachineBasicBlock &MBB) const override
	Perform most of the PEI work here:

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

bool	enableCalleeSaveSkip (const MachineFunction &MF) const override
	Returns true if the target can safely skip saving callee-saved registers for noreturn nounwind functions.

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().

bool	hasReservedCallFrame (const MachineFunction &MF) const override
	hasReservedCallFrame - Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function.

bool	canSimplifyCallFramePseudos (const MachineFunction &MF) const override
	canSimplifyCallFramePseudos - When possible, it's best to simplify the call frame pseudo ops before doing frame index elimination.

MachineBasicBlock::iterator	eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator I) 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).

void	processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS=nullptr) const override
	processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized.

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.

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

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.

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

const SpillSlot *	getCalleeSavedSpillSlots (unsigned &NumEntries) const override
	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.

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

bool	needsAligna (const MachineFunction &MF) const

const MachineInstr *	getAlignaInstr (const MachineFunction &MF) const

void	insertCFIInstructions (MachineFunction &MF) const

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

virtual	~TargetFrameLowering ()

StackDirection	getStackGrowthDirection () const
	getStackGrowthDirection - Return the direction the stack grows

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

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

virtual uint64_t	getStackThreshold () const
	getStackThreshold - Return the maximum stack size

int	alignSPAdjust (int SPAdj) const
	alignSPAdjust - This method aligns the stack adjustment to the correct alignment.

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

bool	isStackRealignable () const
	isStackRealignable - This method returns whether the stack can be realigned.

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

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

virtual bool	allocateScavengingFrameIndexesNearIncomingSP (const MachineFunction &MF) const
	Control the placement of special register scavenging spill slots when allocating a stack frame.

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

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

virtual const SpillSlot *	getCalleeSavedSpillSlots (unsigned &NumEntries) const
	getCalleeSavedSpillSlots - This method returns a pointer to an array of pairs, that contains an entry for each callee saved register that must be spilled to a particular stack location if it is spilled.

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

virtual bool	enableShrinkWrapping (const MachineFunction &MF) const
	Returns true if the target will correctly handle shrink wrapping.

virtual bool	enableStackSlotScavenging (const MachineFunction &MF) const
	Returns true if the stack slot holes in the fixed and callee-save stack area should be used when allocating other stack locations to reduce stack size.

virtual bool	enableCalleeSaveSkip (const MachineFunction &MF) const
	Returns true if the target can safely skip saving callee-saved registers for noreturn nounwind functions.

virtual void	emitPrologue (MachineFunction &MF, MachineBasicBlock &MBB) const =0
	emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.

virtual void	emitEpilogue (MachineFunction &MF, MachineBasicBlock &MBB) const =0

virtual void	emitZeroCallUsedRegs (BitVector RegsToZero, MachineBasicBlock &MBB) const
	emitZeroCallUsedRegs - Zeros out call used registers.

virtual void	emitCalleeSavedFrameMovesFullCFA (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI) const
	With basic block sections, emit callee saved frame moves for basic blocks that are in a different section.

virtual bool	enableCFIFixup (MachineFunction &MF) const
	Returns true if we may need to fix the unwind information for the function.

virtual void	resetCFIToInitialState (MachineBasicBlock &MBB) const
	Emit CFI instructions that recreate the state of the unwind information upon fucntion entry.

virtual void	inlineStackProbe (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
	Replace a StackProbe stub (if any) with the actual probe code inline.

virtual bool	stackProbeFunctionModifiesSP () const
	Does the stack probe function call return with a modified stack pointer?

virtual void	adjustForSegmentedStacks (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
	Adjust the prologue to have the function use segmented stacks.

virtual void	adjustForHiPEPrologue (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
	Adjust the prologue to add Erlang Run-Time System (ERTS) specific code in the assembly prologue to explicitly handle the stack.

virtual bool	spillCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, ArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI) const
	spillCalleeSavedRegisters - Issues instruction(s) to spill all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of store instructions via storeRegToStackSlot().

virtual bool	restoreCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, MutableArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI) const
	restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of load instructions via loadRegToStackSlot().

virtual bool	keepFramePointer (const MachineFunction &MF) const
	Return true if the target wants to keep the frame pointer regardless of the function attribute "frame-pointer".

virtual bool	hasFP (const MachineFunction &MF) const =0
	hasFP - Return true if the specified function should have a dedicated frame pointer register.

virtual bool	hasReservedCallFrame (const MachineFunction &MF) const
	hasReservedCallFrame - Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function.

virtual bool	canSimplifyCallFramePseudos (const MachineFunction &MF) const
	canSimplifyCallFramePseudos - When possible, it's best to simplify the call frame pseudo ops before doing frame index elimination.

virtual bool	needsFrameIndexResolution (const MachineFunction &MF) const

virtual StackOffset	getFrameIndexReference (const MachineFunction &MF, int FI, Register &FrameReg) const
	getFrameIndexReference - This method should return the base register and offset used to reference a frame index location.

virtual StackOffset	getFrameIndexReferencePreferSP (const MachineFunction &MF, int FI, Register &FrameReg, bool IgnoreSPUpdates) const
	Same as `getFrameIndexReference`, except that the stack pointer (as opposed to the frame pointer) will be the preferred value for `FrameReg`.

virtual StackOffset	getNonLocalFrameIndexReference (const MachineFunction &MF, int FI) const
	getNonLocalFrameIndexReference - This method returns the offset used to reference a frame index location.

virtual StackOffset	getFrameIndexReferenceFromSP (const MachineFunction &MF, int FI) const
	getFrameIndexReferenceFromSP - This method returns the offset from the stack pointer to the slot of the specified index.

virtual void	getCalleeSaves (const MachineFunction &MF, BitVector &SavedRegs) const
	Returns the callee-saved registers as computed by determineCalleeSaves in the BitVector `SavedRegs`.

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

virtual void	processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS=nullptr) const
	processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized.

virtual void	processFunctionBeforeFrameIndicesReplaced (MachineFunction &MF, RegScavenger *RS=nullptr) const
	processFunctionBeforeFrameIndicesReplaced - This method is called immediately before MO_FrameIndex operands are eliminated, but after the frame is finalized.

virtual unsigned	getWinEHParentFrameOffset (const MachineFunction &MF) const

virtual MachineBasicBlock::iterator	eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) const
	This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy pseudo instructions (but only if the Target is using them).

virtual void	orderFrameObjects (const MachineFunction &MF, SmallVectorImpl< int > &objectsToAllocate) const
	Order the symbols in the local stack frame.

virtual bool	canUseAsPrologue (const MachineBasicBlock &MBB) const
	Check whether or not the given `MBB` can be used as a prologue for the target.

virtual bool	canUseAsEpilogue (const MachineBasicBlock &MBB) const
	Check whether or not the given `MBB` can be used as a epilogue for the target.

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

virtual bool	isSupportedStackID (TargetStackID::Value ID) const

virtual bool	isProfitableForNoCSROpt (const Function &F) const
	Check if the no-CSR optimisation is profitable for the given function.

virtual int	getInitialCFAOffset (const MachineFunction &MF) const
	Return initial CFA offset value i.e.

virtual Register	getInitialCFARegister (const MachineFunction &MF) const
	Return initial CFA register value i.e.

virtual DwarfFrameBase	getDwarfFrameBase (const MachineFunction &MF) const
	Return the frame base information to be encoded in the DWARF subprogram debug info.

virtual void	spillFPBP (MachineFunction &MF) const
	If frame pointer or base pointer is clobbered by an instruction, we should spill/restore it around that instruction.

virtual void	emitRemarks (const MachineFunction &MF, MachineOptimizationRemarkEmitter *ORE) const
	This method is called at the end of prolog/epilog code insertion, so targets can emit remarks based on the final frame layout.

Public Attributes
int	FirstVarArgSavedReg

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 31 of file HexagonFrameLowering.h.

Constructor & Destructor Documentation

◆ HexagonFrameLowering()

llvm::HexagonFrameLowering::HexagonFrameLowering ( )

inlineexplicit

Definition at line 35 of file HexagonFrameLowering.h.

Member Function Documentation

◆ assignCalleeSavedSpillSlots()

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

overridevirtual

◆ canSimplifyCallFramePseudos()

bool llvm::HexagonFrameLowering::canSimplifyCallFramePseudos ( const MachineFunction & MF ) const

inlineoverridevirtual

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 from llvm::TargetFrameLowering.

Definition at line 72 of file HexagonFrameLowering.h.

◆ determineCalleeSaves()

void HexagonFrameLowering::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 2077 of file HexagonFrameLowering.cpp.

References A, llvm::RegScavenger::addScavengingFrameIndex(), llvm::MachineFrameInfo::CreateSpillStackObject(), llvm::TargetFrameLowering::determineCalleeSaves(), llvm::SmallVectorBase< Size_T >::empty(), llvm::HexagonRegisterInfo::getCalleeSavedRegs(), llvm::MachineFunction::getFrameInfo(), llvm::TargetRegisterClass::getID(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), llvm::HexagonMachineFunctionInfo::hasEHReturn(), llvm::SetVector< T, Vector, Set, N >::insert(), isOptNone(), MRI, needToReserveScavengingSpillSlots(), NumberScavengerSlots, OptimizeSpillSlots, llvm::BitVector::resize(), and llvm::BitVector::set().

◆ eliminateCallFramePseudoInstr()

MachineBasicBlock::iterator HexagonFrameLowering::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 1492 of file HexagonFrameLowering.cpp.

References assert(), llvm::MachineBasicBlock::erase(), I, MBB, and MI.

◆ emitEpilogue()

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

inlineoverridevirtual

Implements llvm::TargetFrameLowering.

Definition at line 47 of file HexagonFrameLowering.h.

◆ emitPrologue()

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

overridevirtual

Perform most of the PEI work here:

saving/restoring of the callee-saved registers,
stack frame creation and destruction. Normally, this work is distributed among various functions, but doing it in one place allows shrink-wrapping of the stack frame.

Implements llvm::TargetFrameLowering.

Definition at line 511 of file HexagonFrameLowering.cpp.

References llvm::MachineInstr::addOperand(), B, llvm::MachineOperand::CreateReg(), EnableShrinkWrapping, llvm::MachineFunction::front(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getNumBlockIDs(), llvm::MachineInstr::getOpcode(), getReturn(), llvm::MachineFunction::getSubtarget(), and isRestoreCall().

◆ enableCalleeSaveSkip()

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

overridevirtual

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

Reimplemented from llvm::TargetFrameLowering.

Definition at line 562 of file HexagonFrameLowering.cpp.

References assert(), F, llvm::MachineFunction::getFunction(), and llvm::MachineFunction::getSubtarget().

◆ getAlignaInstr()

const MachineInstr * HexagonFrameLowering::getAlignaInstr ( const MachineFunction & MF ) const

Definition at line 2555 of file HexagonFrameLowering.cpp.

References B, and I.

Referenced by processFunctionBeforeFrameFinalized().

◆ getCalleeSavedSpillSlots()

const SpillSlot * llvm::HexagonFrameLowering::getCalleeSavedSpillSlots ( unsigned & NumEntries ) const

inlineoverridevirtual

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 from llvm::TargetFrameLowering.

Definition at line 94 of file HexagonFrameLowering.h.

Referenced by assignCalleeSavedSpillSlots().

◆ getFrameIndexReference()

StackOffset HexagonFrameLowering::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 1263 of file HexagonFrameLowering.cpp.

References assert(), FP, llvm::StackOffset::getFixed(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetMachine::getOptLevel(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), llvm::MachineFunction::getTarget(), hasFP(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::MachineFrameInfo::isObjectPreAllocated(), llvm::None, and llvm::Offset.

◆ hasFP()

bool HexagonFrameLowering::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 1144 of file HexagonFrameLowering.cpp.

References EliminateFramePointer, enableAllocFrameElim(), EnableStackOVFSanitizer, llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getOptLevel(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), llvm::MachineFunction::getTarget(), llvm::MachineFrameInfo::hasCalls(), llvm::Function::hasFnAttribute(), llvm::MachineFrameInfo::hasVarSizedObjects(), and llvm::None.

Referenced by getFrameIndexReference(), and llvm::HexagonRegisterInfo::getFrameRegister().

◆ hasReservedCallFrame()

bool llvm::HexagonFrameLowering::hasReservedCallFrame ( const MachineFunction & MF ) const

inlineoverridevirtual

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 67 of file HexagonFrameLowering.h.

◆ insertCFIInstructions()

void HexagonFrameLowering::insertCFIInstructions ( MachineFunction & MF ) const

Definition at line 1025 of file HexagonFrameLowering.cpp.

References B, and findCFILocation().

◆ needsAligna()

bool HexagonFrameLowering::needsAligna ( const MachineFunction & MF ) const

Definition at line 2545 of file HexagonFrameLowering.cpp.

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

◆ orderFrameObjects()

void HexagonFrameLowering::orderFrameObjects	(	const MachineFunction &	MF,
		SmallVectorImpl< int > &	objectsToAllocate
	)		const

overridevirtual

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 from llvm::TargetFrameLowering.

Definition at line 2711 of file HexagonFrameLowering.cpp.

References llvm::SmallVectorBase< Size_T >::empty(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectIndexEnd(), llvm::MachineFrameInfo::getObjectSize(), llvm::SmallVectorBase< Size_T >::Size, llvm::SmallVectorBase< Size_T >::size(), Size, and llvm::stable_sort().

◆ processFunctionBeforeFrameFinalized()

void HexagonFrameLowering::processFunctionBeforeFrameFinalized	(	MachineFunction &	MF,
		RegScavenger *	RS = `nullptr`
	)		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 1503 of file HexagonFrameLowering.cpp.

References assert(), getAlignaInstr(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getMaxAlign(), llvm::TargetFrameLowering::getStackAlign(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::Register::isPhysical(), and llvm::Register::isValid().

◆ restoreCalleeSavedRegisters()

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

inlineoverridevirtual

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 60 of file HexagonFrameLowering.h.

◆ spillCalleeSavedRegisters()

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

inlineoverridevirtual

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 52 of file HexagonFrameLowering.h.

◆ targetHandlesStackFrameRounding()

bool llvm::HexagonFrameLowering::targetHandlesStackFrameRounding ( ) const

inlineoverridevirtual

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

Reimplemented from llvm::TargetFrameLowering.

Definition at line 86 of file HexagonFrameLowering.h.

Member Data Documentation

◆ FirstVarArgSavedReg

int llvm::HexagonFrameLowering::FirstVarArgSavedReg

Definition at line 34 of file HexagonFrameLowering.h.

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

lib/Target/Hexagon/HexagonFrameLowering.h
lib/Target/Hexagon/HexagonFrameLowering.cpp

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ HexagonFrameLowering()

Member Function Documentation

◆ assignCalleeSavedSpillSlots()

◆ canSimplifyCallFramePseudos()

◆ determineCalleeSaves()

◆ eliminateCallFramePseudoInstr()

◆ emitEpilogue()

◆ emitPrologue()

◆ enableCalleeSaveSkip()

◆ getAlignaInstr()

◆ getCalleeSavedSpillSlots()

◆ getFrameIndexReference()

◆ hasFP()

◆ hasReservedCallFrame()

◆ insertCFIInstructions()

◆ needsAligna()

◆ orderFrameObjects()

◆ processFunctionBeforeFrameFinalized()

◆ restoreCalleeSavedRegisters()

◆ spillCalleeSavedRegisters()

◆ targetHandlesStackFrameRounding()

Member Data Documentation

◆ FirstVarArgSavedReg