Defines the object file and target independent interfaces used by the assembler backend to write native file format object files. More...

#include "llvm/MC/MCObjectWriter.h"

Inheritance diagram for llvm::MCObjectWriter:

[legend]

Public Member Functions
	MCObjectWriter (const MCObjectWriter &)=delete

MCObjectWriter &	operator= (const MCObjectWriter &)=delete

virtual	~MCObjectWriter ()

virtual void	reset ()
	lifetime management

High-Level API
virtual void	executePostLayoutBinding (MCAssembler &Asm, const MCAsmLayout &Layout)=0
	Perform any late binding of symbols (for example, to assign symbol indices for use when generating relocations).

virtual void	recordRelocation (MCAssembler &Asm, const MCAsmLayout &Layout, const MCFragment *Fragment, const MCFixup &Fixup, MCValue Target, uint64_t &FixedValue)=0
	Record a relocation entry.

bool	isSymbolRefDifferenceFullyResolved (const MCAssembler &Asm, const MCSymbolRefExpr A, const MCSymbolRefExpr B, bool InSet) const
	Check whether the difference (A - B) between two symbol references is fully resolved.

virtual bool	isSymbolRefDifferenceFullyResolvedImpl (const MCAssembler &Asm, const MCSymbol &A, const MCSymbol &B, bool InSet) const

virtual bool	isSymbolRefDifferenceFullyResolvedImpl (const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB, bool InSet, bool IsPCRel) const

virtual void	markGnuAbi ()
	ELF only. Mark that we have seen GNU ABI usage (e.g. SHF_GNU_RETAIN).

void	emitAddrsigSection ()
	Tell the object writer to emit an address-significance table during writeObject().

bool	getEmitAddrsigSection ()

void	addAddrsigSymbol (const MCSymbol *Sym)
	Record the given symbol in the address-significance table to be written diring writeObject().

std::vector< const MCSymbol * > &	getAddrsigSyms ()

virtual void	addExceptionEntry (const MCSymbol Symbol, const MCSymbol Trap, unsigned LanguageCode, unsigned ReasonCode, unsigned FunctionSize, bool hasDebug)

virtual uint64_t	writeObject (MCAssembler &Asm, const MCAsmLayout &Layout)=0
	Write the object file and returns the number of bytes written.

Protected Member Functions
	MCObjectWriter ()=default

Protected Attributes
std::vector< const MCSymbol * >	AddrsigSyms

bool	EmitAddrsigSection = false

Detailed Description

Defines the object file and target independent interfaces used by the assembler backend to write native file format object files.

The object writer contains a few callbacks used by the assembler to allow the object writer to modify the assembler data structures at appropriate points. Once assembly is complete, the object writer is given the MCAssembler instance, which contains all the symbol and section data which should be emitted as part of writeObject().

Definition at line 34 of file MCObjectWriter.h.

Constructor & Destructor Documentation

◆ MCObjectWriter() [1/2]

llvm::MCObjectWriter::MCObjectWriter ( )

protecteddefault

◆ MCObjectWriter() [2/2]

llvm::MCObjectWriter::MCObjectWriter ( const MCObjectWriter & )

delete

◆ ~MCObjectWriter()

MCObjectWriter::~MCObjectWriter ( )

virtualdefault

Member Function Documentation

◆ addAddrsigSymbol()

void llvm::MCObjectWriter::addAddrsigSymbol ( const MCSymbol * Sym )

inline

Record the given symbol in the address-significance table to be written diring writeObject().

Definition at line 104 of file MCObjectWriter.h.

References AddrsigSyms, and Sym.

Referenced by llvm::MCObjectStreamer::emitAddrsigSym().

◆ addExceptionEntry()

virtual void llvm::MCObjectWriter::addExceptionEntry	(	const MCSymbol *	Symbol,
		const MCSymbol *	Trap,
		unsigned	LanguageCode,
		unsigned	ReasonCode,
		unsigned	FunctionSize,
		bool	hasDebug
	)

inlinevirtual

Definition at line 108 of file MCObjectWriter.h.

References llvm::report_fatal_error().

Referenced by llvm::MCXCOFFStreamer::emitXCOFFExceptDirective().

◆ emitAddrsigSection()

void llvm::MCObjectWriter::emitAddrsigSection ( )

inline

Tell the object writer to emit an address-significance table during writeObject().

If this function is not called, all symbols are treated as address-significant.

Definition at line 98 of file MCObjectWriter.h.

References EmitAddrsigSection.

Referenced by llvm::MCObjectStreamer::emitAddrsig().

◆ executePostLayoutBinding()

virtual void llvm::MCObjectWriter::executePostLayoutBinding	(	MCAssembler &	Asm,
		const MCAsmLayout &	Layout
	)

pure virtual

Perform any late binding of symbols (for example, to assign symbol indices for use when generating relocations).

This routine is called by the assembler after layout and relaxation is complete.

Implemented in llvm::MachObjectWriter.

Referenced by llvm::MCAssembler::layout().

◆ getAddrsigSyms()

std::vector< const MCSymbol * > & llvm::MCObjectWriter::getAddrsigSyms ( )

inline

Definition at line 106 of file MCObjectWriter.h.

References AddrsigSyms.

Referenced by llvm::MachObjectWriter::populateAddrSigSection().

◆ getEmitAddrsigSection()

bool llvm::MCObjectWriter::getEmitAddrsigSection ( )

inline

Definition at line 100 of file MCObjectWriter.h.

References EmitAddrsigSection.

◆ isSymbolRefDifferenceFullyResolved()

bool MCObjectWriter::isSymbolRefDifferenceFullyResolved	(	const MCAssembler &	Asm,
		const MCSymbolRefExpr *	A,
		const MCSymbolRefExpr *	B,
		bool	InSet
	)		const

Check whether the difference (A - B) between two symbol references is fully resolved.

Clients are not required to answer precisely and may conservatively return false, even when a difference is fully resolved.

Definition at line 21 of file MCObjectWriter.cpp.

References A, B, llvm::MCSymbol::getFragment(), isSymbolRefDifferenceFullyResolvedImpl(), llvm::MCSymbol::isUndefined(), and llvm::MCSymbolRefExpr::VK_None.

◆ isSymbolRefDifferenceFullyResolvedImpl() [1/2]

bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl	(	const MCAssembler &	Asm,
		const MCSymbol &	A,
		const MCSymbol &	B,
		bool	InSet
	)		const

virtual

Reimplemented in llvm::MachObjectWriter.

Definition at line 40 of file MCObjectWriter.cpp.

References A, B, and isSymbolRefDifferenceFullyResolvedImpl().

Referenced by isSymbolRefDifferenceFullyResolved(), isSymbolRefDifferenceFullyResolvedImpl(), and llvm::MachObjectWriter::isSymbolRefDifferenceFullyResolvedImpl().

◆ isSymbolRefDifferenceFullyResolvedImpl() [2/2]

bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl	(	const MCAssembler &	Asm,
		const MCSymbol &	SymA,
		const MCFragment &	FB,
		bool	InSet,
		bool	IsPCRel
	)		const

virtual

Reimplemented in llvm::MachObjectWriter.

Definition at line 47 of file MCObjectWriter.cpp.

References llvm::MCFragment::getParent(), and llvm::MCSymbol::getSection().

◆ markGnuAbi()

virtual void llvm::MCObjectWriter::markGnuAbi ( )

inlinevirtual

ELF only. Mark that we have seen GNU ABI usage (e.g. SHF_GNU_RETAIN).

Definition at line 93 of file MCObjectWriter.h.

Referenced by llvm::MCELFStreamer::emitSymbolAttribute().

◆ operator=()

MCObjectWriter & llvm::MCObjectWriter::operator= ( const MCObjectWriter & )

delete

◆ recordRelocation()

virtual void llvm::MCObjectWriter::recordRelocation	(	MCAssembler &	Asm,
		const MCAsmLayout &	Layout,
		const MCFragment *	Fragment,
		const MCFixup &	Fixup,
		MCValue	Target,
		uint64_t &	FixedValue
	)

pure virtual

Record a relocation entry.

This routine is called by the assembler after layout and relaxation, and post layout binding. The implementation is responsible for storing information about the relocation so that it can be emitted during writeObject().

Implemented in llvm::MachObjectWriter.

◆ reset()

virtual void llvm::MCObjectWriter::reset ( )

inlinevirtual

lifetime management

Reimplemented in llvm::MachObjectWriter.

Definition at line 47 of file MCObjectWriter.h.

Referenced by llvm::MCAssembler::reset(), and llvm::MachObjectWriter::reset().

◆ writeObject()

virtual uint64_t llvm::MCObjectWriter::writeObject	(	MCAssembler &	Asm,
		const MCAsmLayout &	Layout
	)

pure virtual

Write the object file and returns the number of bytes written.

This routine is called by the assembler after layout and relaxation is complete, fixups have been evaluated and applied, and relocations generated.

Implemented in llvm::MachObjectWriter.

Referenced by llvm::MCAssembler::Finish().

Member Data Documentation

◆ AddrsigSyms

std::vector<const MCSymbol *> llvm::MCObjectWriter::AddrsigSyms

protected

Definition at line 36 of file MCObjectWriter.h.

Referenced by addAddrsigSymbol(), and getAddrsigSyms().

◆ EmitAddrsigSection

bool llvm::MCObjectWriter::EmitAddrsigSection = false

protected

Definition at line 37 of file MCObjectWriter.h.

Referenced by emitAddrsigSection(), and getEmitAddrsigSection().

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

include/llvm/MC/MCObjectWriter.h
lib/MC/MCObjectWriter.cpp

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ MCObjectWriter() [1/2]

◆ MCObjectWriter() [2/2]

◆ ~MCObjectWriter()

Member Function Documentation

◆ addAddrsigSymbol()

◆ addExceptionEntry()

◆ emitAddrsigSection()

◆ executePostLayoutBinding()

◆ getAddrsigSyms()

◆ getEmitAddrsigSection()

◆ isSymbolRefDifferenceFullyResolved()

◆ isSymbolRefDifferenceFullyResolvedImpl() [1/2]

◆ isSymbolRefDifferenceFullyResolvedImpl() [2/2]

◆ markGnuAbi()

◆ operator=()

◆ recordRelocation()

◆ reset()

◆ writeObject()

Member Data Documentation

◆ AddrsigSyms

◆ EmitAddrsigSection