MCAsmBackend - Generic interface to target specific assembler backends. More...

#include <MCAsmBackend.h>

Inheritance diagram for llvm::MCAsmBackend:

Collaboration diagram for llvm::MCAsmBackend:

Public Member Functions
virtual	~MCAsmBackend ()
virtual void	reset ()
	lifetime management
virtual MCObjectWriter *	createObjectWriter (raw_ostream &OS) const =0
virtual MCELFObjectTargetWriter *	createELFObjectTargetWriter () const
bool	hasDataInCodeSupport () const
virtual bool	doesSectionRequireSymbols (const MCSection &Section) const
virtual bool	isSectionAtomizable (const MCSection &Section) const
virtual unsigned	getMinimumNopSize () const
virtual bool	writeNopData (uint64_t Count, MCObjectWriter *OW) const =0
virtual void	handleAssemblerFlag (MCAssemblerFlag Flag)
virtual uint32_t	generateCompactUnwindEncoding (ArrayRef< MCCFIInstruction >) const
	Generate the compact unwind encoding for the CFI instructions.
Target Fixup Interfaces
virtual unsigned	getNumFixupKinds () const =0
	getNumFixupKinds - Get the number of target specific fixup kinds.
virtual const MCFixupKindInfo &	getFixupKindInfo (MCFixupKind Kind) const
	getFixupKindInfo - Get information on a fixup kind.
virtual void	processFixupValue (const MCAssembler &Asm, const MCAsmLayout &Layout, const MCFixup &Fixup, const MCFragment *DF, const MCValue &Target, uint64_t &Value, bool &IsResolved)
virtual void	applyFixup (const MCFixup &Fixup, char *Data, unsigned DataSize, uint64_t Value, bool IsPCRel) const =0
Target Relaxation Interfaces
virtual bool	mayNeedRelaxation (const MCInst &Inst) const =0
virtual bool	fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const =0
virtual void	relaxInstruction (const MCInst &Inst, MCInst &Res) const =0
Protected Member Functions
	MCAsmBackend ()
Protected Attributes
unsigned	HasDataInCodeSupport: 1

Detailed Description

MCAsmBackend - Generic interface to target specific assembler backends.

Definition at line 34 of file MCAsmBackend.h.

Constructor & Destructor Documentation

MCAsmBackend::MCAsmBackend ( ) [protected]

Definition at line 15 of file MCAsmBackend.cpp.

MCAsmBackend::~MCAsmBackend ( ) [virtual]

Definition at line 17 of file MCAsmBackend.cpp.

Member Function Documentation

virtual void llvm::MCAsmBackend::applyFixup	(	const MCFixup &	Fixup,
		char *	Data,
		unsigned	DataSize,
		uint64_t	Value,
		bool	IsPCRel
	)		const `[pure virtual]`

applyFixup - 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.

Implemented in llvm::MipsAsmBackend.

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

virtual MCELFObjectTargetWriter* llvm::MCAsmBackend::createELFObjectTargetWriter ( ) const [inline, virtual]

createELFObjectTargetWriter - Create a new ELFObjectTargetWriter to enable non-standard ELFObjectWriters.

Definition at line 55 of file MCAsmBackend.h.

References llvm_unreachable.

virtual MCObjectWriter* llvm::MCAsmBackend::createObjectWriter ( raw_ostream & OS ) const [pure virtual]

createObjectWriter - Create a new MCObjectWriter instance for use by the assembler backend to emit the final object file.

Implemented in llvm::MipsAsmBackend.

virtual bool llvm::MCAsmBackend::doesSectionRequireSymbols ( const MCSection & Section ) const [inline, virtual]

doesSectionRequireSymbols - Check whether the given section requires that all symbols (even temporaries) have symbol table entries.

Definition at line 66 of file MCAsmBackend.h.

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

virtual bool llvm::MCAsmBackend::fixupNeedsRelaxation	(	const MCFixup &	Fixup,
		uint64_t	Value,
		const MCRelaxableFragment *	DF,
		const MCAsmLayout &	Layout
	)		const `[pure virtual]`

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

Implemented in llvm::MipsAsmBackend.

virtual uint32_t llvm::MCAsmBackend::generateCompactUnwindEncoding ( ArrayRef< MCCFIInstruction > ) const [inline, virtual]

Generate the compact unwind encoding for the CFI instructions.

Definition at line 149 of file MCAsmBackend.h.

Referenced by llvm::MCStreamer::generateCompactUnwindEncodings().

const MCFixupKindInfo & MCAsmBackend::getFixupKindInfo ( MCFixupKind Kind ) const [virtual]

getFixupKindInfo - Get information on a fixup kind.

Reimplemented in llvm::MipsAsmBackend.

Definition at line 20 of file MCAsmBackend.cpp.

References llvm::array_lengthof(), and llvm::MCFixupKindInfo::FKF_IsPCRel.

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

virtual unsigned llvm::MCAsmBackend::getMinimumNopSize ( ) const [inline, virtual]

getMinimumNopSize - Returns the minimum size of a nop in bytes on this target. The assembler will use this to emit excess padding in situations where the padding required for simple alignment would be less than the minimum nop size.

Definition at line 134 of file MCAsmBackend.h.

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

virtual unsigned llvm::MCAsmBackend::getNumFixupKinds ( ) const [pure virtual]

getNumFixupKinds - Get the number of target specific fixup kinds.

Implemented in llvm::MipsAsmBackend.

virtual void llvm::MCAsmBackend::handleAssemblerFlag ( MCAssemblerFlag Flag ) [inline, virtual]

handleAssemblerFlag - Handle any target-specific assembler flags. By default, do nothing.

Definition at line 145 of file MCAsmBackend.h.

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

bool llvm::MCAsmBackend::hasDataInCodeSupport ( ) const [inline]

hasDataInCodeSupport - Check whether this target implements data-in-code markers. If not, data region directives will be ignored.

Definition at line 62 of file MCAsmBackend.h.

References HasDataInCodeSupport.

virtual bool llvm::MCAsmBackend::isSectionAtomizable ( const MCSection & Section ) const [inline, virtual]

isSectionAtomizable - Check whether the given section can be split into atoms.

See also:: MCAssembler::isSymbolLinkerVisible().

Definition at line 74 of file MCAsmBackend.h.

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

virtual bool llvm::MCAsmBackend::mayNeedRelaxation ( const MCInst & Inst ) const [pure virtual]

mayNeedRelaxation - Check whether the given instruction may need relaxation.

Parameters:

Inst	- The instruction to test.

Implemented in llvm::MipsAsmBackend.

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

virtual void llvm::MCAsmBackend::processFixupValue	(	const MCAssembler &	Asm,
		const MCAsmLayout &	Layout,
		const MCFixup &	Fixup,
		const MCFragment *	DF,
		const MCValue &	Target,
		uint64_t &	Value,
		bool &	IsResolved
	)		`[inline, virtual]`

processFixupValue - Target hook to adjust the literal value of a fixup if necessary. IsResolved signals whether the caller believes a relocation is needed; the target can modify the value. The default does nothing.

Reimplemented in llvm::MipsAsmBackend.

Definition at line 90 of file MCAsmBackend.h.

virtual void llvm::MCAsmBackend::relaxInstruction	(	const MCInst &	Inst,
		MCInst &	Res
	)		const `[pure virtual]`

RelaxInstruction - 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.
[out]	Res	On return, the relaxed instruction.

Implemented in llvm::MipsAsmBackend.

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

virtual void llvm::MCAsmBackend::reset ( ) [inline, virtual]

lifetime management

Definition at line 47 of file MCAsmBackend.h.

Referenced by llvm::LLVMTargetMachine::addPassesToEmitFile(), llvm::LLVMTargetMachine::addPassesToEmitMC(), and llvm::MCAssembler::reset().

virtual bool llvm::MCAsmBackend::writeNopData	(	uint64_t	Count,
		MCObjectWriter *	OW
	)		const `[pure virtual]`

writeNopData - Write an (optimal) nop sequence of Count bytes to the given output. If the target cannot generate such a sequence, it should return an error.

Returns:: - True on success.

Implemented in llvm::MipsAsmBackend.

Referenced by writeFragment().

Member Data Documentation

unsigned llvm::MCAsmBackend::HasDataInCodeSupport [protected]

Definition at line 41 of file MCAsmBackend.h.

Referenced by hasDataInCodeSupport().

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

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation