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

Inheritance diagram for llvm::ARMAsmBackend:

Collaboration diagram for llvm::ARMAsmBackend:

Public Member Functions
	ARMAsmBackend (const Target &T, const MCSubtargetInfo &STI, support::endianness Endian)

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

bool	hasNOP () const

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

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

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. More...

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. More...

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

bool	fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const override
	Simple predicate for targets where !Resolved implies requiring relaxation. More...

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

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

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

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 ()

virtual void	reset ()
	lifetime management More...

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. More...

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. More...

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

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

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

virtual uint32_t	generateCompactUnwindEncoding (ArrayRef< MCCFIInstruction >) const
	Generate the compact unwind encoding for the CFI instructions. More...

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

void	handleCodePaddingBasicBlockStart (MCObjectStreamer *OS, const MCCodePaddingContext &Context)
	Handles all target related code padding when starting to write a new basic block to an object file. More...

void	handleCodePaddingBasicBlockEnd (const MCCodePaddingContext &Context)
	Handles all target related code padding after writing a block to an object file. More...

void	handleCodePaddingInstructionBegin (const MCInst &Inst)
	Handles all target related code padding before writing a new instruction to an object file. More...

void	handleCodePaddingInstructionEnd (const MCInst &Inst)
	Handles all target related code padding after writing an instruction to an object file. More...

bool	relaxFragment (MCPaddingFragment *PF, MCAsmLayout &Layout)
	Relaxes a fragment (changes the size of the padding) according to target requirements. More...

virtual Optional< MCFixupKind >	getFixupKind (StringRef Name) const
	Map a relocation name used in .reloc to a fixup kind. More...

virtual bool	requiresDiffExpressionRelocations () const
	Check whether the given target requires emitting differences of two symbols as a set of relocations. More...

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

Additional Inherited Members
Public Attributes inherited from llvm::MCAsmBackend
const support::endianness	Endian

Protected Member Functions inherited from llvm::MCAsmBackend
	MCAsmBackend (support::endianness Endian)

Detailed Description

Definition at line 21 of file ARMAsmBackend.h.

Constructor & Destructor Documentation

◆ ARMAsmBackend()

llvm::ARMAsmBackend::ARMAsmBackend	(	const Target &	T,
		const MCSubtargetInfo &	STI,
		support::endianness	Endian
	)

inline

Definition at line 28 of file ARMAsmBackend.h.

Member Function Documentation

◆ adjustFixupValue()

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

Definition at line 362 of file ARMAsmBackend.cpp.

Referenced by hasNOP().

◆ applyFixup()

void ARMAsmBackend::applyFixup	(	const MCAssembler &	Asm,
		const MCFixup &	Fixup,
		const MCValue &	Target,
		MutableArrayRef< char >	Data,
		uint64_t	Value,
		bool	IsResolved,
		const MCSubtargetInfo *	STI
	)		const

overridevirtual

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.

Errors (such as an out of range fixup value) should be reported via Ctx. The STI is present only for fragments of type MCRelaxableFragment and MCDataFragment with hasInstructions() == true.

Implements llvm::MCAsmBackend.

Definition at line 903 of file ARMAsmBackend.cpp.

References adjustFixupValue(), assert(), llvm::support::big, llvm::MCAssembler::getContext(), getFixupKindContainerSizeBytes(), getFixupKindNumBytes(), llvm::MCFixup::getKind(), llvm::MCFixup::getOffset(), llvm::support::little, and llvm::ArrayRef< T >::size().

Referenced by hasNOP().

◆ fixupNeedsRelaxation()

bool ARMAsmBackend::fixupNeedsRelaxation	(	const MCFixup &	Fixup,
		uint64_t	Value,
		const MCRelaxableFragment *	DF,
		const MCAsmLayout &	Layout
	)		const

overridevirtual

Simple predicate for targets where !Resolved implies requiring relaxation.

Implements llvm::MCAsmBackend.

Definition at line 259 of file ARMAsmBackend.cpp.

Referenced by hasNOP().

◆ getFixupKindInfo()

const MCFixupKindInfo & ARMAsmBackend::getFixupKindInfo ( MCFixupKind Kind ) const

overridevirtual

Get information on a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Definition at line 50 of file ARMAsmBackend.cpp.

References assert(), llvm::FirstTargetFixupKind, llvm::MCFixupKindInfo::FKF_IsAlignedDownTo32Bits, llvm::MCFixupKindInfo::FKF_IsPCRel, llvm::MCAsmBackend::getFixupKindInfo(), llvm::support::little, and llvm::ARM::NumTargetFixupKinds.

Referenced by hasNOP().

◆ getNumFixupKinds()

unsigned llvm::ARMAsmBackend::getNumFixupKinds ( ) const

inlineoverridevirtual

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 33 of file ARMAsmBackend.h.

References llvm::ARM::NumTargetFixupKinds.

◆ getPointerSize()

unsigned llvm::ARMAsmBackend::getPointerSize ( ) const

inline

Definition at line 75 of file ARMAsmBackend.h.

◆ getRelaxedOpcode()

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

Definition at line 176 of file ARMAsmBackend.cpp.

References llvm::MCSubtargetInfo::getFeatureBits().

Referenced by hasNOP().

◆ handleAssemblerFlag()

void ARMAsmBackend::handleAssemblerFlag ( MCAssemblerFlag Flag )

overridevirtual

Handle any target-specific assembler flags. By default, do nothing.

Reimplemented from llvm::MCAsmBackend.

Definition at line 163 of file ARMAsmBackend.cpp.

References llvm::MCAF_Code16, and llvm::MCAF_Code32.

Referenced by hasNOP().

◆ hasNOP()

bool llvm::ARMAsmBackend::hasNOP ( ) const

inline

Definition at line 39 of file ARMAsmBackend.h.

References adjustFixupValue(), applyFixup(), llvm::HexStyle::Asm, llvm::Data, Fixup, fixupNeedsRelaxation(), llvm::MCSubtargetInfo::getFeatureBits(), getFixupKindInfo(), getRelaxedOpcode(), handleAssemblerFlag(), Kind, mayNeedRelaxation(), reasonForFixupRelaxation(), relaxInstruction(), shouldForceRelocation(), and writeNopData().

◆ isThumb()

bool llvm::ARMAsmBackend::isThumb ( ) const

inline

Definition at line 76 of file ARMAsmBackend.h.

◆ mayNeedRelaxation()

bool ARMAsmBackend::mayNeedRelaxation	(	const MCInst &	Inst,
		const MCSubtargetInfo &	STI
	)		const

overridevirtual

Check whether the given instruction may need relaxation.

Parameters

Inst	- The instruction to test.
STI	- The MCSubtargetInfo in effect when the instruction was encoded.

Implements llvm::MCAsmBackend.

Definition at line 199 of file ARMAsmBackend.cpp.

References llvm::MCInst::getOpcode(), and getRelaxedOpcode().

Referenced by hasNOP().

◆ reasonForFixupRelaxation()

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

Definition at line 206 of file ARMAsmBackend.cpp.

References llvm::ARM::fixup_arm_thumb_bcc, llvm::ARM::fixup_arm_thumb_br, llvm::ARM::fixup_arm_thumb_cb, llvm::ARM::fixup_arm_thumb_cp, llvm::ARM::fixup_thumb_adr_pcrel_10, llvm::MCFixup::getKind(), and llvm_unreachable.

Referenced by hasNOP().

◆ relaxInstruction()

void ARMAsmBackend::relaxInstruction	(	const MCInst &	Inst,
		const MCSubtargetInfo &	STI,
		MCInst &	Res
	)		const

overridevirtual

Relax the instruction in the given fragment to the next wider instruction.

Parameters

	Inst	The instruction to relax, which may be the same as the output.
	STI	the subtarget information for the associated instruction.
[out]	Res	On return, the relaxed instruction.

Implements llvm::MCAsmBackend.

Definition at line 265 of file ARMAsmBackend.cpp.

References llvm::MCInst::addOperand(), llvm::MCOperand::createImm(), llvm::MCOperand::createReg(), llvm::MCInst::dump_pretty(), llvm::MCInst::getOpcode(), getRelaxedOpcode(), llvm::report_fatal_error(), llvm::MCInst::setOpcode(), and llvm::raw_svector_ostream::str().

Referenced by hasNOP().

◆ setIsThumb()

void llvm::ARMAsmBackend::setIsThumb ( bool it )

inline

Definition at line 77 of file ARMAsmBackend.h.

◆ shouldForceRelocation()

bool ARMAsmBackend::shouldForceRelocation	(	const MCAssembler &	Asm,
		const MCFixup &	Fixup,
		const MCValue &	Target
	)

overridevirtual

Hook to check if a relocation is needed for some target specific reason.

Reimplemented from llvm::MCAsmBackend.

Definition at line 759 of file ARMAsmBackend.cpp.

References assert(), llvm::ARM::fixup_arm_blx, llvm::ARM::fixup_arm_condbl, llvm::ARM::fixup_arm_thumb_bl, llvm::ARM::fixup_arm_thumb_blx, llvm::ARM::fixup_arm_thumb_br, llvm::ARM::fixup_arm_uncondbl, llvm::ARM::fixup_arm_uncondbranch, llvm::ARM::fixup_t2_condbranch, llvm::ARM::fixup_t2_uncondbranch, llvm::FixupKind(), llvm::MCFixup::getKind(), llvm::MCValue::getSymA(), llvm::MCSymbolRefExpr::getSymbol(), getType(), llvm::MCSymbol::isELF(), llvm::MCSymbol::isExternal(), llvm::MCAssembler::isThumbFunc(), llvm::ELF::STT_FUNC, and llvm::ELF::STT_GNU_IFUNC.

Referenced by hasNOP().

◆ writeNopData()

bool ARMAsmBackend::writeNopData	(	raw_ostream &	OS,
		uint64_t	Count
	)		const

overridevirtual

Write an (optimal) nop sequence of Count bytes to the given output.

If the target cannot generate such a sequence, it should return an error.

Returns: - True on success.

Implements llvm::MCAsmBackend.

Definition at line 296 of file ARMAsmBackend.cpp.

References isThumb(), llvm::support::endian::write(), and llvm::raw_ostream::write().

Referenced by hasNOP().

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

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ARMAsmBackend()

Member Function Documentation

◆ adjustFixupValue()

◆ applyFixup()

◆ fixupNeedsRelaxation()

◆ getFixupKindInfo()

◆ getNumFixupKinds()

◆ getPointerSize()

◆ getRelaxedOpcode()

◆ handleAssemblerFlag()

◆ hasNOP()

◆ isThumb()

◆ mayNeedRelaxation()

◆ reasonForFixupRelaxation()

◆ relaxInstruction()

◆ setIsThumb()

◆ shouldForceRelocation()

◆ writeNopData()