#include "Target/RISCV/MCTargetDesc/RISCVAsmBackend.h"

Inheritance diagram for llvm::RISCVAsmBackend:

Collaboration diagram for llvm::RISCVAsmBackend:

Public Member Functions
	RISCVAsmBackend (const MCSubtargetInfo &STI, uint8_t OSABI, bool Is64Bit)

	~RISCVAsmBackend () override

void	setForceRelocs ()

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

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...

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

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...

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...

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

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

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

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

unsigned	getRelaxedOpcode (unsigned Op) const

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...

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

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 24 of file RISCVAsmBackend.h.

Constructor & Destructor Documentation

◆ RISCVAsmBackend()

llvm::RISCVAsmBackend::RISCVAsmBackend	(	const MCSubtargetInfo &	STI,
		uint8_t	OSABI,
		bool	Is64Bit
	)

inline

Definition at line 31 of file RISCVAsmBackend.h.

Referenced by llvm::createRISCVAsmBackend().

◆ ~RISCVAsmBackend()

llvm::RISCVAsmBackend::~RISCVAsmBackend ( )

inlineoverride

Definition at line 34 of file RISCVAsmBackend.h.

Member Function Documentation

◆ applyFixup()

void RISCVAsmBackend::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 263 of file RISCVAsmBackend.cpp.

References adjustFixupValue(), llvm::alignTo(), assert(), llvm::MCAssembler::getContext(), getFixupKindInfo(), llvm::MCFixup::getKind(), llvm::MCFixup::getOffset(), Info, llvm::ArrayRef< T >::size(), llvm::MCFixupKindInfo::TargetOffset, and llvm::MCFixupKindInfo::TargetSize.

Referenced by requiresDiffExpressionRelocations().

◆ createObjectTargetWriter()

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

overridevirtual

Implements llvm::MCAsmBackend.

Definition at line 291 of file RISCVAsmBackend.cpp.

References llvm::createRISCVELFObjectWriter().

Referenced by requiresDiffExpressionRelocations().

◆ fixupNeedsRelaxation()

bool llvm::RISCVAsmBackend::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 55 of file RISCVAsmBackend.h.

References fixupNeedsRelaxationAdvanced(), and llvm_unreachable.

◆ fixupNeedsRelaxationAdvanced()

bool RISCVAsmBackend::fixupNeedsRelaxationAdvanced	(	const MCFixup &	Fixup,
		bool	Resolved,
		uint64_t	Value,
		const MCRelaxableFragment *	DF,
		const MCAsmLayout &	Layout,
		const bool	WasForced
	)		const

overridevirtual

Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.

Reimplemented from llvm::MCAsmBackend.

Definition at line 63 of file RISCVAsmBackend.cpp.

References llvm::RISCV::fixup_riscv_rvc_branch, llvm::RISCV::fixup_riscv_rvc_jump, and llvm::MCFixup::getKind().

Referenced by fixupNeedsRelaxation().

◆ getFixupKindInfo()

const MCFixupKindInfo& llvm::RISCVAsmBackend::getFixupKindInfo ( MCFixupKind Kind ) const

inlineoverridevirtual

Get information on a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Definition at line 71 of file RISCVAsmBackend.h.

References llvm::array_lengthof(), assert(), llvm::FirstTargetFixupKind, llvm::MCFixupKindInfo::FKF_IsPCRel, llvm::MCAsmBackend::getFixupKindInfo(), getNumFixupKinds(), getRelaxedOpcode(), mayNeedRelaxation(), llvm::RISCV::NumTargetFixupKinds, relaxInstruction(), and writeNopData().

Referenced by applyFixup().

◆ getNumFixupKinds()

unsigned llvm::RISCVAsmBackend::getNumFixupKinds ( ) const

inlineoverridevirtual

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 67 of file RISCVAsmBackend.h.

References llvm::RISCV::NumTargetFixupKinds.

Referenced by getFixupKindInfo().

◆ getRelaxedOpcode()

unsigned RISCVAsmBackend::getRelaxedOpcode ( unsigned Op ) const

Definition at line 129 of file RISCVAsmBackend.cpp.

Referenced by getFixupKindInfo(), and mayNeedRelaxation().

◆ mayNeedRelaxation()

bool RISCVAsmBackend::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 143 of file RISCVAsmBackend.cpp.

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

Referenced by getFixupKindInfo().

◆ relaxInstruction()

void RISCVAsmBackend::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 91 of file RISCVAsmBackend.cpp.

References llvm::MCInst::addOperand(), llvm::MCOperand::createReg(), llvm::MCInst::getOpcode(), llvm::MCInst::getOperand(), llvm_unreachable, and llvm::MCInst::setOpcode().

Referenced by getFixupKindInfo().