Utilities for manipulating generated AVR machine code. More...

#include "Target/AVR/MCTargetDesc/AVRAsmBackend.h"

Inheritance diagram for llvm::AVRAsmBackend:

Public Member Functions
	AVRAsmBackend (Triple::OSType OSType)

void	adjustFixupValue (const MCFixup &Fixup, const MCValue &Target, uint64_t &Value, MCContext *Ctx=nullptr) const

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

void	applyFixup (const MCFragment &, const MCFixup &, const MCValue &Target, uint8_t *Data, uint64_t Value, bool IsResolved) override

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

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

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.

bool	forceRelocation (const MCFragment &F, const MCFixup &Fixup, const MCValue &Target)

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

MCAsmBackend &	operator= (const MCAsmBackend &)=delete

virtual	~MCAsmBackend ()

void	setAssembler (MCAssembler *A)

MCContext &	getContext () const

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

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 bool	finishLayout (const MCAssembler &Asm) const

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

bool	isDarwinCanonicalPersonality (const MCSymbol *Sym) const

virtual std::optional< bool >	evaluateFixup (const MCFragment &, MCFixup &, MCValue &, uint64_t &)

void	maybeAddReloc (const MCFragment &, const MCFixup &, const MCValue &, uint64_t &Value, bool IsResolved)

virtual bool	mayNeedRelaxation (unsigned Opcode, ArrayRef< MCOperand > Operands, const MCSubtargetInfo &STI) const
	Check whether the given instruction (encoded as Opcode+Operands) may need relaxation.

virtual bool	fixupNeedsRelaxationAdvanced (const MCFragment &, const MCFixup &, const MCValue &, uint64_t, bool Resolved) const
	Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.

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

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

virtual bool	relaxAlign (MCFragment &F, unsigned &Size)

virtual bool	relaxDwarfLineAddr (MCFragment &) const

virtual bool	relaxDwarfCFA (MCFragment &) const

virtual std::pair< bool, bool >	relaxLEB128 (MCFragment &, int64_t &Value) const

Additional Inherited Members
Static Public Member Functions inherited from llvm::MCAsmBackend
static const MCSubtargetInfo *	getSubtargetInfo (const MCFragment &F)

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

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

Protected Attributes inherited from llvm::MCAsmBackend
MCAssembler *	Asm = nullptr

bool	AllowAutoPadding = false

bool	AllowEnhancedRelaxation = false

Detailed Description

Utilities for manipulating generated AVR machine code.

Definition at line 29 of file AVRAsmBackend.h.

Constructor & Destructor Documentation

◆ AVRAsmBackend()

llvm::AVRAsmBackend::AVRAsmBackend ( Triple::OSType OSType )

inline

Definition at line 31 of file AVRAsmBackend.h.

Member Function Documentation

◆ adjustFixupValue()

void llvm::AVRAsmBackend::adjustFixupValue	(	const MCFixup &	Fixup,
		const MCValue &	Target,
		uint64_t &	Value,
		MCContext *	Ctx = `nullptr`
	)		const

Definition at line 248 of file AVRAsmBackend.cpp.

References adjust::ldi::fixup(), Fixup, adjust::fixup_13_pcrel(), llvm::AVR::fixup_13_pcrel, llvm::AVR::fixup_16, llvm::AVR::fixup_16_pm, adjust::fixup_6(), llvm::AVR::fixup_6, adjust::fixup_6_adiw(), llvm::AVR::fixup_6_adiw, adjust::fixup_7_pcrel(), llvm::AVR::fixup_7_pcrel, adjust::fixup_call(), llvm::AVR::fixup_call, llvm::AVR::fixup_hh8_ldi, llvm::AVR::fixup_hh8_ldi_neg, llvm::AVR::fixup_hh8_ldi_pm, llvm::AVR::fixup_hh8_ldi_pm_neg, llvm::AVR::fixup_hi8_ldi, llvm::AVR::fixup_hi8_ldi_gs, llvm::AVR::fixup_hi8_ldi_neg, llvm::AVR::fixup_hi8_ldi_pm, llvm::AVR::fixup_hi8_ldi_pm_neg, llvm::AVR::fixup_ldi, adjust::fixup_lds_sts_16(), llvm::AVR::fixup_lds_sts_16, llvm::AVR::fixup_lo8_ldi, llvm::AVR::fixup_lo8_ldi_gs, llvm::AVR::fixup_lo8_ldi_neg, llvm::AVR::fixup_lo8_ldi_pm, llvm::AVR::fixup_lo8_ldi_pm_neg, llvm::AVR::fixup_ms8_ldi, llvm::AVR::fixup_ms8_ldi_neg, adjust::fixup_port5(), llvm::AVR::fixup_port5, adjust::fixup_port6(), llvm::AVR::fixup_port6, llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, getFixupKindInfo(), adjust::ldi::hh8(), adjust::ldi::hi8(), llvm_unreachable, adjust::ldi::lo8(), adjust::ldi::ms8(), adjust::ldi::neg(), adjust::pm(), Size, llvm::MCFixupKindInfo::TargetSize, and adjust::unsigned_width().

Referenced by applyFixup().

◆ applyFixup()

void llvm::AVRAsmBackend::applyFixup	(	const MCFragment &	F,
		const MCFixup &	Fixup,
		const MCValue &	Target,
		uint8_t *	Data,
		uint64_t	Value,
		bool	IsResolved
	)