#include "Target/ARM/MCTargetDesc/ARMAsmBackendDarwin.h"

Inheritance diagram for llvm::ARMAsmBackendDarwin:

Public Member Functions
	ARMAsmBackendDarwin (const Target &T, const MCSubtargetInfo &STI, const MCRegisterInfo &MRI)

std::unique_ptr< MCObjectTargetWriter >	createObjectTargetWriter () const override

uint64_t	generateCompactUnwindEncoding (const MCDwarfFrameInfo FI, const MCContext Ctxt) const override
	Generate compact unwind encoding for the function based on the CFI instructions.

Public Member Functions inherited from llvm::ARMAsmBackend
	ARMAsmBackend (const Target &T, bool isThumb, llvm::endianness Endian)

unsigned	getNumFixupKinds () const override
	Get the number of target specific fixup kinds.

bool	hasNOP (const MCSubtargetInfo *STI) const

std::optional< MCFixupKind >	getFixupKind (StringRef Name) const override
	Map a relocation name used in .reloc to a fixup kind.

const MCFixupKindInfo &	getFixupKindInfo (MCFixupKind Kind) const override
	Get information on a fixup kind.

bool	shouldForceRelocation (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, const MCSubtargetInfo *STI) override
	Hook to check if a relocation is needed for some target specific reason.

unsigned	adjustFixupValue (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, uint64_t Value, bool IsResolved, MCContext &Ctx, const MCSubtargetInfo *STI) const

void	applyFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef< char > Data, uint64_t Value, bool IsResolved, const MCSubtargetInfo *STI) const override
	Apply the `Value` for given `Fixup` into the provided data fragment, at the offset specified by the fixup and following the fixup kind as appropriate.

unsigned	getRelaxedOpcode (unsigned Op, const MCSubtargetInfo &STI) const

bool	mayNeedRelaxation (const MCInst &Inst, const MCSubtargetInfo &STI) const override
	Check whether the given instruction may need relaxation.

const char *	reasonForFixupRelaxation (const MCFixup &Fixup, uint64_t Value) const

bool	fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value) const override
	Simple predicate for targets where !Resolved implies requiring relaxation.

void	relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const override
	Relax the instruction in the given fragment to the next wider instruction.

bool	writeNopData (raw_ostream &OS, uint64_t Count, const MCSubtargetInfo *STI) const override
	Write an (optimal) nop sequence of Count bytes to the given output.

void	handleAssemblerFlag (MCAssemblerFlag Flag) override
	Handle any target-specific assembler flags. By default, do nothing.

unsigned	getPointerSize () const

bool	isThumb () const

void	setIsThumb (bool it)

Public Member Functions inherited from llvm::MCAsmBackend
	MCAsmBackend (const MCAsmBackend &)=delete

MCAsmBackend &	operator= (const MCAsmBackend &)=delete

virtual	~MCAsmBackend ()

bool	allowLinkerRelaxation () const

virtual bool	allowAutoPadding () const
	Return true if this target might automatically pad instructions and thus need to emit padding enable/disable directives around sensative code.

virtual bool	allowEnhancedRelaxation () const
	Return true if this target allows an unrelaxable instruction to be emitted into RelaxableFragment and then we can increase its size in a tricky way for optimization.

virtual void	reset ()
	lifetime management

std::unique_ptr< MCObjectWriter >	createObjectWriter (raw_pwrite_stream &OS) const
	Create a new MCObjectWriter instance for use by the assembler backend to emit the final object file.

std::unique_ptr< MCObjectWriter >	createDwoObjectWriter (raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS) const
	Create an MCObjectWriter that writes two object files: a .o file which is linked into the final program and a .dwo file which is used by debuggers.

virtual std::unique_ptr< MCObjectTargetWriter >	createObjectTargetWriter () const =0

virtual unsigned	getMinimumNopSize () const
	Returns the minimum size of a nop in bytes on this target.

virtual unsigned	getMaximumNopSize (const MCSubtargetInfo &STI) const
	Returns the maximum size of a nop in bytes on this target.

virtual bool	writeNopData (raw_ostream &OS, uint64_t Count, const MCSubtargetInfo *STI) const =0
	Write an (optimal) nop sequence of Count bytes to the given output.

virtual void	finishLayout (MCAssembler const &Asm) const
	Give backend an opportunity to finish layout after relaxation.

virtual void	handleAssemblerFlag (MCAssemblerFlag Flag)
	Handle any target-specific assembler flags. By default, do nothing.

virtual uint64_t	generateCompactUnwindEncoding (const MCDwarfFrameInfo FI, const MCContext Ctxt) const
	Generate the compact unwind encoding for the CFI instructions.

virtual bool	isMicroMips (const MCSymbol *Sym) const
	Check whether a given symbol has been flagged with MICROMIPS flag.

bool	isDarwinCanonicalPersonality (const MCSymbol *Sym) const

virtual bool	shouldInsertExtraNopBytesForCodeAlign (const MCAlignFragment &AF, unsigned &Size)
	Hook to check if extra nop bytes must be inserted for alignment directive.

virtual bool	shouldInsertFixupForCodeAlign (MCAssembler &Asm, MCAlignFragment &AF)
	Hook which indicates if the target requires a fixup to be generated when handling an align directive in an executable section.

virtual bool	evaluateTargetFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCFragment DF, const MCValue &Target, const MCSubtargetInfo STI, uint64_t &Value, bool &WasForced)

virtual bool	handleAddSubRelocations (const MCAssembler &Asm, const MCFragment &F, const MCFixup &Fixup, const MCValue &Target, uint64_t &FixedValue) const

virtual bool	fixupNeedsRelaxationAdvanced (const MCAssembler &Asm, const MCFixup &Fixup, bool Resolved, uint64_t Value, const MCRelaxableFragment *DF, const bool WasForced) const
	Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.

virtual bool	relaxDwarfLineAddr (const MCAssembler &Asm, MCDwarfLineAddrFragment &DF, bool &WasRelaxed) const

virtual bool	relaxDwarfCFA (const MCAssembler &Asm, MCDwarfCallFrameFragment &DF, bool &WasRelaxed) const

virtual std::pair< bool, bool >	relaxLEB128 (const MCAssembler &Asm, MCLEBFragment &LF, int64_t &Value) const

Public Attributes
const MachO::CPUSubTypeARM	Subtype

Public Attributes inherited from llvm::MCAsmBackend
const llvm::endianness	Endian

const unsigned	RelaxFixupKind
	Fixup kind used for linker relaxation.

Additional Inherited Members
Protected Member Functions inherited from llvm::MCAsmBackend
	MCAsmBackend (llvm::endianness Endian, unsigned RelaxFixupKind=MaxFixupKind)

Detailed Description

Definition at line 18 of file ARMAsmBackendDarwin.h.

Constructor & Destructor Documentation

◆ ARMAsmBackendDarwin()

llvm::ARMAsmBackendDarwin::ARMAsmBackendDarwin	(	const Target &	T,
		const MCSubtargetInfo &	STI,
		const MCRegisterInfo &	MRI
	)

inline

Definition at line 23 of file ARMAsmBackendDarwin.h.

References MRI.

Member Function Documentation

◆ createObjectTargetWriter()

std::unique_ptr< MCObjectTargetWriter > llvm::ARMAsmBackendDarwin::createObjectTargetWriter ( ) const

inlineoverridevirtual

Implements llvm::MCAsmBackend.

Definition at line 32 of file ARMAsmBackendDarwin.h.

References llvm::cantFail(), llvm::createARMMachObjectWriter(), llvm::MachO::getCPUType(), and Subtype.

◆ generateCompactUnwindEncoding()

uint64_t ARMAsmBackendDarwin::generateCompactUnwindEncoding	(	const MCDwarfFrameInfo *	FI,
		const MCContext *	Ctxt
	)		const

overridevirtual

Generate compact unwind encoding for the function based on the CFI instructions.

If the CFI instructions describe a frame that cannot be encoded in compact unwind, the method returns UNWIND_ARM_MODE_DWARF which tells the runtime to fallback and unwind using dwarf.

Reimplemented from llvm::MCAsmBackend.

Definition at line 1173 of file ARMAsmBackend.cpp.

Member Data Documentation

◆ Subtype

const MachO::CPUSubTypeARM llvm::ARMAsmBackendDarwin::Subtype

Definition at line 22 of file ARMAsmBackendDarwin.h.

Referenced by createObjectTargetWriter(), and generateCompactUnwindEncoding().

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

lib/Target/ARM/MCTargetDesc/ARMAsmBackendDarwin.h
lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp

Public Member Functions

Public Attributes

Additional Inherited Members