#include "Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.h"

Inheritance diagram for llvm::LoongArchAsmBackend:

Public Member Functions
	LoongArchAsmBackend (const MCSubtargetInfo &STI, uint8_t OSABI, bool Is64Bit, const MCTargetOptions &Options)

	~LoongArchAsmBackend () override

bool	handleAddSubRelocations (const MCAsmLayout &Layout, const MCFragment &F, const MCFixup &Fixup, const MCValue &Target, uint64_t &FixedValue) const override

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.

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

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

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.

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.

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

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.

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

std::pair< bool, bool >	relaxLEB128 (MCLEBFragment &LF, MCAsmLayout &Layout, int64_t &Value) const override

bool	relaxDwarfLineAddr (MCDwarfLineAddrFragment &DF, MCAsmLayout &Layout, bool &WasRelaxed) const override

bool	relaxDwarfCFA (MCDwarfCallFrameFragment &DF, MCAsmLayout &Layout, bool &WasRelaxed) const override

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.

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

const MCTargetOptions &	getTargetOptions () const

DenseMap< MCSection , const MCSymbolRefExpr > &	getSecToAlignSym ()

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

MCAsmBackend &	operator= (const MCAsmBackend &)=delete

virtual	~MCAsmBackend ()

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	emitInstructionBegin (MCObjectStreamer &OS, const MCInst &Inst, const MCSubtargetInfo &STI)
	Give the target a chance to manipulate state related to instruction alignment (e.g.

virtual void	emitInstructionEnd (MCObjectStreamer &OS, const MCInst &Inst)

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, MCAsmLayout &Layout) 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 uint32_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	evaluateTargetFixup (const MCAssembler &Asm, const MCAsmLayout &Layout, const MCFixup &Fixup, const MCFragment DF, const MCValue &Target, const MCSubtargetInfo STI, uint64_t &Value, bool &WasForced)

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

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.

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

const unsigned	RelaxFixupKind
	Fixup kind used for linker relaxation. Currently only used by RISC-V.

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

Detailed Description

Definition at line 27 of file LoongArchAsmBackend.h.

Constructor & Destructor Documentation

◆ LoongArchAsmBackend()

llvm::LoongArchAsmBackend::LoongArchAsmBackend	(	const MCSubtargetInfo &	STI,
		uint8_t	OSABI,
		bool	Is64Bit,
		const MCTargetOptions &	Options
	)

inline

Definition at line 35 of file LoongArchAsmBackend.h.

◆ ~LoongArchAsmBackend()

llvm::LoongArchAsmBackend::~LoongArchAsmBackend ( )

inlineoverride

Definition at line 40 of file LoongArchAsmBackend.h.

Member Function Documentation

◆ applyFixup()

void LoongArchAsmBackend::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 146 of file LoongArchAsmBackend.cpp.

References adjustFixupValue(), llvm::alignTo(), assert(), llvm::Data, llvm::FirstLiteralRelocationKind, Fixup, fixupLeb128(), llvm::FK_Data_leb128, getFixupKindInfo(), I, Info, and llvm::Offset.

◆ createObjectTargetWriter()

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

overridevirtual

Implements llvm::MCAsmBackend.

Definition at line 505 of file LoongArchAsmBackend.cpp.

References llvm::createLoongArchELFObjectWriter(), and llvm::MCSubtargetInfo::hasFeature().

◆ fixupNeedsRelaxation()

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

inlineoverridevirtual

Simple predicate for targets where !Resolved implies requiring relaxation.

Implements llvm::MCAsmBackend.

Definition at line 64 of file LoongArchAsmBackend.h.

◆ getFixupKind()

std::optional< MCFixupKind > LoongArchAsmBackend::getFixupKind ( StringRef Name ) const

overridevirtual

Map a relocation name used in .reloc to a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Definition at line 32 of file LoongArchAsmBackend.cpp.

References llvm::StringSwitch< T, R >::Case(), llvm::StringSwitch< T, R >::Default(), llvm::FirstLiteralRelocationKind, llvm::MCSubtargetInfo::getTargetTriple(), llvm::Triple::isOSBinFormatELF(), and Name.

◆ getFixupKindInfo()

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

overridevirtual

Get information on a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Definition at line 49 of file LoongArchAsmBackend.cpp.

References assert(), llvm::FirstLiteralRelocationKind, llvm::FirstTargetFixupKind, llvm::FK_NONE, llvm::MCFixupKindInfo::FKF_IsPCRel, llvm::MCAsmBackend::getFixupKindInfo(), getNumFixupKinds(), and llvm::LoongArch::NumTargetFixupKinds.

Referenced by applyFixup().

◆ getNumFixupKinds()

unsigned llvm::LoongArchAsmBackend::getNumFixupKinds ( ) const

inlineoverridevirtual

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 70 of file LoongArchAsmBackend.h.

References llvm::LoongArch::NumTargetFixupKinds.

Referenced by getFixupKindInfo().

◆ getSecToAlignSym()

DenseMap< MCSection *, const MCSymbolRefExpr * > & llvm::LoongArchAsmBackend::getSecToAlignSym ( )

inline

Definition at line 95 of file LoongArchAsmBackend.h.

Referenced by shouldInsertFixupForCodeAlign().

◆ getTargetOptions()

const MCTargetOptions & llvm::LoongArchAsmBackend::getTargetOptions ( ) const

inline

Definition at line 94 of file LoongArchAsmBackend.h.

◆ handleAddSubRelocations()

bool LoongArchAsmBackend::handleAddSubRelocations	(	const MCAsmLayout &	Layout,
		const MCFragment &	F,
		const MCFixup &	Fixup,
		const MCValue &	Target,
		uint64_t &	FixedValue
	)		const

overridevirtual

Reimplemented from llvm::MCAsmBackend.

Definition at line 445 of file LoongArchAsmBackend.cpp.

References A, B, llvm::MCFixup::create(), F, Fixup, llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, llvm::FK_Data_leb128, llvm::MCValue::get(), llvm::MCAsmLayout::getAssembler(), getRelocPairForSize(), llvm::MCSymbol::getSection(), llvm::MCSubtargetInfo::hasFeature(), llvm::MCSymbol::isInSection(), and llvm_unreachable.

◆ relaxDwarfCFA()

bool LoongArchAsmBackend::relaxDwarfCFA	(	MCDwarfCallFrameFragment &	DF,
		MCAsmLayout &	Layout,
		bool &	WasRelaxed
	)		const

overridevirtual

Reimplemented from llvm::MCAsmBackend.

Definition at line 372 of file LoongArchAsmBackend.cpp.

References assert(), llvm::MCFixup::create(), llvm::Data, DF, llvm::MCExpr::evaluateKnownAbsolute(), llvm::MCContext::getAsmInfo(), llvm::MCAsmLayout::getAssembler(), llvm::MCAssembler::getContext(), llvm::MCBinaryExpr::getLHS(), llvm::MCAsmInfo::getMinInstAlignment(), getRelocPairForSize(), llvm::MCBinaryExpr::getRHS(), llvm::isUIntN(), llvm::little, llvm_unreachable, llvm::Offset, and OS.

◆ relaxDwarfLineAddr()

bool LoongArchAsmBackend::relaxDwarfLineAddr	(	MCDwarfLineAddrFragment &	DF,
		MCAsmLayout &	Layout,
		bool &	WasRelaxed
	)		const

overridevirtual

Reimplemented from llvm::MCAsmBackend.

Definition at line 304 of file LoongArchAsmBackend.cpp.

References assert(), llvm::CallingConv::C, llvm::MCFixup::create(), llvm::Data, DF, llvm::encodeSLEB128(), llvm::encodeULEB128(), llvm::MCExpr::evaluateKnownAbsolute(), llvm::MCAsmLayout::getAssembler(), llvm::MCAssembler::getContext(), llvm::MCBinaryExpr::getLHS(), getRelocPairForSize(), llvm::MCBinaryExpr::getRHS(), INT64_MAX, llvm::little, llvm::Offset, OS, llvm::raw_ostream::tell(), and llvm::raw_ostream::write_zeros().

◆ relaxInstruction()

void llvm::LoongArchAsmBackend::relaxInstruction	(	MCInst &	Inst,
		const MCSubtargetInfo &	STI
	)		const

inlineoverridevirtual

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

Parameters

[out]	Inst	The instruction to relax, which is also the relaxed instruction.
	STI	the subtarget information for the associated instruction.

Reimplemented from llvm::MCAsmBackend.

Definition at line 78 of file LoongArchAsmBackend.h.

◆ relaxLEB128()

std::pair< bool, bool > LoongArchAsmBackend::relaxLEB128	(	MCLEBFragment &	LF,
		MCAsmLayout &	Layout,
		int64_t &	Value
	)		const

overridevirtual

Reimplemented from llvm::MCAsmBackend.

Definition at line 293 of file LoongArchAsmBackend.cpp.

References llvm::MCFixup::create(), llvm::MCExpr::evaluateKnownAbsolute(), llvm::FK_Data_leb128, llvm::MCEncodedFragmentWithFixups< ContentsSize, FixupsSize >::getFixups(), llvm::MCExpr::getLoc(), llvm::MCLEBFragment::getValue(), and llvm::MCLEBFragment::isSigned().

◆ shouldForceRelocation()

bool LoongArchAsmBackend::shouldForceRelocation	(	const MCAssembler &	Asm,
		const MCFixup &	Fixup,
		const MCValue &	Target,
		const MCSubtargetInfo *	STI
	)

overridevirtual

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

Reimplemented from llvm::MCAsmBackend.

Definition at line 243 of file LoongArchAsmBackend.cpp.

References llvm::FirstLiteralRelocationKind, Fixup, llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, llvm::FK_Data_leb128, and llvm::MCSubtargetInfo::hasFeature().

◆ shouldInsertExtraNopBytesForCodeAlign()

bool LoongArchAsmBackend::shouldInsertExtraNopBytesForCodeAlign	(	const MCAlignFragment &	AF,
		unsigned &	Size
	)

overridevirtual

Hook to check if extra nop bytes must be inserted for alignment directive.

For some targets this may be necessary in order to support linker relaxation. The number of bytes to insert are returned in Size.

Reimplemented from llvm::MCAsmBackend.

Definition at line 186 of file LoongArchAsmBackend.cpp.

References llvm::MCAlignFragment::getAlignment(), llvm::MCAlignFragment::getMaxBytesToEmit(), llvm::MCAlignFragment::getSubtargetInfo(), llvm::MCSubtargetInfo::hasFeature(), Size, and llvm::Align::value().

Referenced by shouldInsertFixupForCodeAlign().

◆ shouldInsertFixupForCodeAlign()

bool LoongArchAsmBackend::shouldInsertFixupForCodeAlign	(	MCAssembler &	Asm,
		const MCAsmLayout &	Layout,
		MCAlignFragment &	AF
	)

overridevirtual

Hook which indicates if the target requires a fixup to be generated when handling an align directive in an executable section.

Reimplemented from llvm::MCAsmBackend.

Definition at line 209 of file LoongArchAsmBackend.cpp.

References llvm::MCSymbolRefExpr::create(), llvm::MCConstantExpr::create(), llvm::MCFixup::create(), Fixup, llvm::LoongArch::fixup_loongarch_align, llvm::MCValue::get(), llvm::MCSection::getBeginSymbol(), llvm::MCAlignFragment::getMaxBytesToEmit(), llvm::MCFragment::getParent(), getSecToAlignSym(), llvm::MCAlignFragment::getSubtargetInfo(), llvm::MCSubtargetInfo::hasFeature(), llvm::Hi, llvm::Lo, llvm::Log2_64(), and shouldInsertExtraNopBytesForCodeAlign().

◆ writeNopData()

bool LoongArchAsmBackend::writeNopData	(	raw_ostream &	OS,
		uint64_t	Count,
		const MCSubtargetInfo *	STI
	)		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 431 of file LoongArchAsmBackend.cpp.

References OS, llvm::raw_ostream::write(), and llvm::raw_ostream::write_zeros().

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

lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.h
lib/Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ LoongArchAsmBackend()

◆ ~LoongArchAsmBackend()

Member Function Documentation

◆ applyFixup()

◆ createObjectTargetWriter()

◆ fixupNeedsRelaxation()

◆ getFixupKind()

◆ getFixupKindInfo()

◆ getNumFixupKinds()

◆ getSecToAlignSym()

◆ getTargetOptions()

◆ handleAddSubRelocations()

◆ relaxDwarfCFA()

◆ relaxDwarfLineAddr()

◆ relaxInstruction()

◆ relaxLEB128()

◆ shouldForceRelocation()

◆ shouldInsertExtraNopBytesForCodeAlign()

◆ shouldInsertFixupForCodeAlign()

◆ writeNopData()