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]

Classes
struct	CGProfileEntry

Public Member Functions
	MCObjectWriter (const MCObjectWriter &)=delete
MCObjectWriter &	operator= (const MCObjectWriter &)=delete
virtual	~MCObjectWriter ()
virtual void	setAssembler (MCAssembler *A)
MCContext &	getContext () const
virtual void	reset ()
	lifetime management
High-Level API
virtual void	executePostLayoutBinding ()
	Perform any late binding of symbols (for example, to assign symbol indices for use when generating relocations).
virtual void	recordRelocation (const MCFragment &F, const MCFixup &Fixup, MCValue Target, uint64_t &FixedValue)
	Record a relocation entry.
bool	isSymbolRefDifferenceFullyResolved (const MCSymbol &A, const MCSymbol &B, bool InSet) const
	Check whether the difference (A - B) between two symbol references is fully resolved.
virtual bool	isSymbolRefDifferenceFullyResolvedImpl (const MCSymbol &SymA, const MCFragment &FB, bool InSet, bool IsPCRel) const
MutableArrayRef< std::pair< std::string, size_t > >	getFileNames ()
void	addFileName (StringRef FileName)
void	setCompilerVersion (StringRef CompilerVers)
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 ()
SmallVector< CGProfileEntry, 0 > &	getCGProfile ()
bool	getSubsectionsViaSymbols () const
void	setSubsectionsViaSymbols (bool Value)
virtual uint64_t	writeObject ()=0
	Write the object file and returns the number of bytes written.

Protected Member Functions
	MCObjectWriter ()=default

Protected Attributes
MCAssembler *	Asm = nullptr
SmallVector< std::pair< std::string, size_t >, 0 >	FileNames
	List of declared file names.
std::string	CompilerVersion
std::vector< const MCSymbol * >	AddrsigSyms
bool	EmitAddrsigSection = false
bool	SubsectionsViaSymbols = false
SmallVector< CGProfileEntry, 0 >	CGProfile

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

Referenced by MCObjectWriter(), and operator=().

◆ MCObjectWriter() [2/2]

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

delete

References MCObjectWriter().

◆ ~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 115 of file MCObjectWriter.h.

References AddrsigSyms.

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

◆ addFileName()

void MCObjectWriter::addFileName ( StringRef FileName )

Definition at line 53 of file MCObjectWriter.cpp.

References Asm, and FileNames.

◆ 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 109 of file MCObjectWriter.h.

References EmitAddrsigSection.

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

◆ executePostLayoutBinding()

virtual void llvm::MCObjectWriter::executePostLayoutBinding ( )

inlinevirtual

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.

Reimplemented in llvm::ELFObjectWriter, llvm::MachObjectWriter, and llvm::WinCOFFObjectWriter.

Definition at line 74 of file MCObjectWriter.h.

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

◆ getAddrsigSyms()

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

inline

Definition at line 117 of file MCObjectWriter.h.

References AddrsigSyms.

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

◆ getCGProfile()

SmallVector< CGProfileEntry, 0 > & llvm::MCObjectWriter::getCGProfile ( )

inline

Definition at line 118 of file MCObjectWriter.h.

References CGProfile.

Referenced by llvm::MCELFStreamer::emitCGProfileEntry(), and llvm::MCWinCOFFStreamer::emitCGProfileEntry().

◆ getContext()

MCContext & MCObjectWriter::getContext ( ) const

Definition at line 23 of file MCObjectWriter.cpp.

References Asm.

Referenced by llvm::ELFObjectWriter::checkRelocation(), llvm::MachObjectWriter::populateAddrSigSection(), llvm::ELFObjectWriter::recordRelocation(), llvm::MachObjectWriter::recordRelocation(), llvm::DXContainerObjectWriter::writeObject(), llvm::MachObjectWriter::writeObject(), and llvm::WinCOFFObjectWriter::writeObject().

◆ getEmitAddrsigSection()

bool llvm::MCObjectWriter::getEmitAddrsigSection ( )

inline

Definition at line 111 of file MCObjectWriter.h.

References EmitAddrsigSection.

◆ getFileNames()

MutableArrayRef< std::pair< std::string, size_t > > llvm::MCObjectWriter::getFileNames ( )

inline

Definition at line 98 of file MCObjectWriter.h.

References FileNames.

◆ getSubsectionsViaSymbols()

bool llvm::MCObjectWriter::getSubsectionsViaSymbols ( ) const

inline

Definition at line 121 of file MCObjectWriter.h.

References SubsectionsViaSymbols.

◆ isSymbolRefDifferenceFullyResolved()

bool MCObjectWriter::isSymbolRefDifferenceFullyResolved	(	const MCSymbol &	A,
		const MCSymbol &	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 36 of file MCObjectWriter.cpp.

References assert(), llvm::MCSymbol::getFragment(), isSymbolRefDifferenceFullyResolvedImpl(), and llvm::MCSymbol::isUndefined().

◆ isSymbolRefDifferenceFullyResolvedImpl()

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

virtual

Reimplemented in llvm::ELFObjectWriter, llvm::MachObjectWriter, and llvm::WinCOFFObjectWriter.

Definition at line 44 of file MCObjectWriter.cpp.

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

Referenced by isSymbolRefDifferenceFullyResolved().

◆ operator=()

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

delete

References MCObjectWriter().

◆ recordRelocation()

void MCObjectWriter::recordRelocation	(	const MCFragment &	F,
		const MCFixup &	Fixup,
		MCValue	Target,
		uint64_t &	FixedValue )

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().

Reimplemented in llvm::ELFObjectWriter, llvm::GOFFObjectWriter, llvm::MachObjectWriter, and llvm::WinCOFFObjectWriter.

Definition at line 33 of file MCObjectWriter.cpp.

References F, and Fixup.