LLVM  6.0.0svn
Public Member Functions | List of all members
llvm::ARMAsmBackend Class Reference

#include "Target/ARM/MCTargetDesc/ARMAsmBackend.h"

Inheritance diagram for llvm::ARMAsmBackend:
Inheritance graph
[legend]
Collaboration diagram for llvm::ARMAsmBackend:
Collaboration graph
[legend]

Public Member Functions

 ARMAsmBackend (const Target &T, const Triple &TT, bool IsLittle)
 
 ~ARMAsmBackend () override
 
unsigned getNumFixupKinds () const override
 Get the number of target specific fixup kinds. More...
 
bool hasNOP () const
 
const MCFixupKindInfogetFixupKindInfo (MCFixupKind Kind) const override
 Get information on a fixup kind. More...
 
bool shouldForceRelocation (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target) override
 Hook to check if a relocation is needed for some target specific reason. More...
 
unsigned adjustFixupValue (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, uint64_t Value, bool IsResolved, MCContext &Ctx, bool IsLittleEndian) const
 
void applyFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef< char > Data, uint64_t Value, bool IsResolved) const override
 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. More...
 
unsigned getRelaxedOpcode (unsigned Op) const
 
bool mayNeedRelaxation (const MCInst &Inst) const override
 Check whether the given instruction may need relaxation. More...
 
const charreasonForFixupRelaxation (const MCFixup &Fixup, uint64_t Value) const
 
bool fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const override
 Simple predicate for targets where !Resolved implies requiring relaxation. More...
 
void relaxInstruction (const MCInst &Inst, const MCSubtargetInfo &STI, MCInst &Res) const override
 Relax the instruction in the given fragment to the next wider instruction. More...
 
bool writeNopData (uint64_t Count, MCObjectWriter *OW) const override
 Write an (optimal) nop sequence of Count bytes to the given output. More...
 
void handleAssemblerFlag (MCAssemblerFlag Flag) override
 Handle any target-specific assembler flags. By default, do nothing. More...
 
unsigned getPointerSize () const
 
bool isThumb () const
 
void setIsThumb (bool it)
 
bool isLittle () const
 
- Public Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (const MCAsmBackend &)=delete
 
MCAsmBackendoperator= (const MCAsmBackend &)=delete
 
virtual ~MCAsmBackend ()
 
virtual void reset ()
 lifetime management More...
 
virtual std::unique_ptr< MCObjectWritercreateObjectWriter (raw_pwrite_stream &OS) const =0
 Create a new MCObjectWriter instance for use by the assembler backend to emit the final object file. More...
 
virtual unsigned getMinimumNopSize () const
 Returns the minimum size of a nop in bytes on this target. More...
 
virtual void finishLayout (MCAssembler const &Asm, MCAsmLayout &Layout) const
 Give backend an opportunity to finish layout after relaxation. More...
 
virtual uint32_t generateCompactUnwindEncoding (ArrayRef< MCCFIInstruction >) const
 Generate the compact unwind encoding for the CFI instructions. More...
 
virtual Optional< MCFixupKindgetFixupKind (StringRef Name) const
 Map a relocation name used in .reloc to a fixup kind. More...
 
virtual bool fixupNeedsRelaxationAdvanced (const MCFixup &Fixup, bool Resolved, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const
 Target specific predicate for whether a given fixup requires the associated instruction to be relaxed. More...
 

Additional Inherited Members

- Protected Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend ()
 

Detailed Description

Definition at line 21 of file ARMAsmBackend.h.

Constructor & Destructor Documentation

◆ ARMAsmBackend()

llvm::ARMAsmBackend::ARMAsmBackend ( const Target T,
const Triple TT,
bool  IsLittle 
)
inline

Definition at line 26 of file ARMAsmBackend.h.

◆ ~ARMAsmBackend()

llvm::ARMAsmBackend::~ARMAsmBackend ( )
inlineoverride

Definition at line 31 of file ARMAsmBackend.h.

Member Function Documentation

◆ adjustFixupValue()

unsigned ARMAsmBackend::adjustFixupValue ( const MCAssembler Asm,
const MCFixup Fixup,
const MCValue Target,
uint64_t  Value,
bool  IsResolved,
MCContext Ctx,
bool  IsLittleEndian 
) const

◆ applyFixup()

void ARMAsmBackend::applyFixup ( const MCAssembler Asm,
const MCFixup Fixup,
const MCValue Target,
MutableArrayRef< char Data,
uint64_t  Value,
bool  IsResolved 
) const
overridevirtual

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.

Errors (such as an out of range fixup value) should be reported via Ctx.

Implements llvm::MCAsmBackend.

Definition at line 884 of file ARMAsmBackend.cpp.

References adjustFixupValue(), assert(), llvm::MCAssembler::getContext(), getFixupKindContainerSizeBytes(), getFixupKindNumBytes(), llvm::MCFixup::getKind(), llvm::MCFixup::getOffset(), and llvm::ArrayRef< T >::size().

Referenced by hasNOP().

◆ fixupNeedsRelaxation()

bool ARMAsmBackend::fixupNeedsRelaxation ( const MCFixup Fixup,
uint64_t  Value,
const MCRelaxableFragment DF,
const MCAsmLayout Layout 
) const
overridevirtual

Simple predicate for targets where !Resolved implies requiring relaxation.

Implements llvm::MCAsmBackend.

Definition at line 257 of file ARMAsmBackend.cpp.

Referenced by hasNOP().

◆ getFixupKindInfo()

const MCFixupKindInfo & ARMAsmBackend::getFixupKindInfo ( MCFixupKind  Kind) const
overridevirtual

◆ getNumFixupKinds()

unsigned llvm::ARMAsmBackend::getNumFixupKinds ( ) const
inlineoverridevirtual

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 33 of file ARMAsmBackend.h.

References llvm::ARM::NumTargetFixupKinds.

◆ getPointerSize()

unsigned llvm::ARMAsmBackend::getPointerSize ( ) const
inline

Definition at line 71 of file ARMAsmBackend.h.

◆ getRelaxedOpcode()

unsigned ARMAsmBackend::getRelaxedOpcode ( unsigned  Op) const

Definition at line 176 of file ARMAsmBackend.cpp.

Referenced by hasNOP().

◆ handleAssemblerFlag()

void ARMAsmBackend::handleAssemblerFlag ( MCAssemblerFlag  Flag)
overridevirtual

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

Reimplemented from llvm::MCAsmBackend.

Definition at line 163 of file ARMAsmBackend.cpp.

References llvm::MCAF_Code16, and llvm::MCAF_Code32.

Referenced by hasNOP().

◆ hasNOP()

bool llvm::ARMAsmBackend::hasNOP ( ) const
inline

◆ isLittle()

bool llvm::ARMAsmBackend::isLittle ( ) const
inline

Definition at line 74 of file ARMAsmBackend.h.

◆ isThumb()

bool llvm::ARMAsmBackend::isThumb ( ) const
inline

Definition at line 72 of file ARMAsmBackend.h.

◆ mayNeedRelaxation()

bool ARMAsmBackend::mayNeedRelaxation ( const MCInst Inst) const
overridevirtual

Check whether the given instruction may need relaxation.

Parameters
Inst- The instruction to test.

Implements llvm::MCAsmBackend.

Definition at line 198 of file ARMAsmBackend.cpp.

References llvm::MCInst::getOpcode(), and getRelaxedOpcode().

Referenced by hasNOP().

◆ reasonForFixupRelaxation()

const char * ARMAsmBackend::reasonForFixupRelaxation ( const MCFixup Fixup,
uint64_t  Value 
) const

◆ relaxInstruction()

void ARMAsmBackend::relaxInstruction ( const MCInst Inst,
const MCSubtargetInfo STI,
MCInst Res 
) const
overridevirtual

Relax the instruction in the given fragment to the next wider instruction.

Parameters
InstThe instruction to relax, which may be the same as the output.
STIthe subtarget information for the associated instruction.
[out]ResOn return, the relaxed instruction.

Implements llvm::MCAsmBackend.

Definition at line 263 of file ARMAsmBackend.cpp.

References llvm::MCInst::addOperand(), llvm::MCOperand::createImm(), llvm::MCOperand::createReg(), llvm::MCInst::dump_pretty(), llvm::MCInst::getOpcode(), getRelaxedOpcode(), llvm::report_fatal_error(), llvm::MCInst::setOpcode(), and llvm::raw_svector_ostream::str().

Referenced by hasNOP().

◆ setIsThumb()

void llvm::ARMAsmBackend::setIsThumb ( bool  it)
inline

Definition at line 73 of file ARMAsmBackend.h.

◆ shouldForceRelocation()

bool ARMAsmBackend::shouldForceRelocation ( const MCAssembler Asm,
const MCFixup Fixup,
const MCValue Target 
)
overridevirtual

◆ writeNopData()

bool ARMAsmBackend::writeNopData ( uint64_t  Count,
MCObjectWriter OW 
) const
overridevirtual

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.

Implements llvm::MCAsmBackend.

Definition at line 294 of file ARMAsmBackend.cpp.

References isThumb(), llvm::MCObjectWriter::write16(), llvm::MCObjectWriter::write32(), and llvm::MCObjectWriter::write8().

Referenced by hasNOP().


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