LLVM  7.0.0svn
Public Member Functions | Protected Member Functions | List of all members
llvm::MCObjectWriter Class Referenceabstract

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:
Inheritance graph
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Public Member Functions

 MCObjectWriter (const MCObjectWriter &)=delete
 
MCObjectWriteroperator= (const MCObjectWriter &)=delete
 
virtual ~MCObjectWriter ()
 
virtual void reset ()
 lifetime management More...
 
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). More...
 
virtual void recordRelocation (MCAssembler &Asm, const MCAsmLayout &Layout, const MCFragment *Fragment, const MCFixup &Fixup, MCValue Target, uint64_t &FixedValue)=0
 Record a relocation entry. More...
 
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. More...
 
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 uint64_t writeObject (MCAssembler &Asm, const MCAsmLayout &Layout)=0
 Write the object file and returns the number of bytes written. More...
 

Protected Member Functions

 MCObjectWriter ()=default
 

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 40 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

◆ 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(), and reset().

◆ 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 20 of file MCObjectWriter.cpp.

References llvm::MCSymbol::getFragment(), llvm::MCSymbolRefExpr::getKind(), llvm::MCSymbolRefExpr::getSymbol(), isSymbolRefDifferenceFullyResolvedImpl(), llvm::MCSymbol::isUndefined(), and llvm::MCSymbolRefExpr::VK_None.

Referenced by reset().

◆ isSymbolRefDifferenceFullyResolvedImpl() [1/2]

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

◆ 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 46 of file MCObjectWriter.cpp.

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

◆ 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.

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

◆ reset()

virtual void llvm::MCObjectWriter::reset ( )
inlinevirtual

◆ 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(), and reset().


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