LLVM 19.0.0git
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llvm::LoongArchAsmBackend Class Reference

#include "Target/LoongArch/MCTargetDesc/LoongArchAsmBackend.h"

Inheritance diagram for llvm::LoongArchAsmBackend:
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Public Member Functions

 LoongArchAsmBackend (const MCSubtargetInfo &STI, uint8_t OSABI, bool Is64Bit, const MCTargetOptions &Options)
 
 ~LoongArchAsmBackend () override
 
bool handleAddSubRelocations (const MCAsmLayout &Layout, const MCFragment &F, const MCFixup &Fixup, const MCValue &Target, uint64_t &FixedValue) const override
 
void applyFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef< char > Data, uint64_t Value, bool IsResolved, const MCSubtargetInfo *STI) 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.
 
bool shouldInsertExtraNopBytesForCodeAlign (const MCAlignFragment &AF, unsigned &Size) override
 Hook to check if extra nop bytes must be inserted for alignment directive.
 
bool shouldInsertFixupForCodeAlign (MCAssembler &Asm, const MCAsmLayout &Layout, MCAlignFragment &AF) override
 Hook which indicates if the target requires a fixup to be generated when handling an align directive in an executable section.
 
bool shouldForceRelocation (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, const MCSubtargetInfo *STI) override
 Hook to check if a relocation is needed for some target specific reason.
 
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.
 
unsigned getNumFixupKinds () const override
 Get the number of target specific fixup kinds.
 
std::optional< MCFixupKindgetFixupKind (StringRef Name) const override
 Map a relocation name used in .reloc to a fixup kind.
 
const MCFixupKindInfogetFixupKindInfo (MCFixupKind Kind) const override
 Get information on a fixup kind.
 
void relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const override
 Relax the instruction in the given fragment to the next wider instruction.
 
std::pair< bool, boolrelaxLEB128 (MCLEBFragment &LF, MCAsmLayout &Layout, int64_t &Value) const override
 
bool relaxDwarfLineAddr (MCDwarfLineAddrFragment &DF, MCAsmLayout &Layout, bool &WasRelaxed) const override
 
bool relaxDwarfCFA (MCDwarfCallFrameFragment &DF, MCAsmLayout &Layout, bool &WasRelaxed) const override
 
bool writeNopData (raw_ostream &OS, uint64_t Count, const MCSubtargetInfo *STI) const override
 Write an (optimal) nop sequence of Count bytes to the given output.
 
std::unique_ptr< MCObjectTargetWritercreateObjectTargetWriter () const override
 
const MCTargetOptionsgetTargetOptions () const
 
DenseMap< MCSection *, const MCSymbolRefExpr * > & getSecToAlignSym ()
 
- Public Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (const MCAsmBackend &)=delete
 
MCAsmBackendoperator= (const MCAsmBackend &)=delete
 
virtual ~MCAsmBackend ()
 
virtual bool allowAutoPadding () const
 Return true if this target might automatically pad instructions and thus need to emit padding enable/disable directives around sensative code.
 
virtual bool allowEnhancedRelaxation () const
 Return true if this target allows an unrelaxable instruction to be emitted into RelaxableFragment and then we can increase its size in a tricky way for optimization.
 
virtual void emitInstructionBegin (MCObjectStreamer &OS, const MCInst &Inst, const MCSubtargetInfo &STI)
 Give the target a chance to manipulate state related to instruction alignment (e.g.
 
virtual void emitInstructionEnd (MCObjectStreamer &OS, const MCInst &Inst)
 
virtual void reset ()
 lifetime management
 
std::unique_ptr< MCObjectWritercreateObjectWriter (raw_pwrite_stream &OS) const
 Create a new MCObjectWriter instance for use by the assembler backend to emit the final object file.
 
std::unique_ptr< MCObjectWritercreateDwoObjectWriter (raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS) const
 Create an MCObjectWriter that writes two object files: a .o file which is linked into the final program and a .dwo file which is used by debuggers.
 
virtual std::unique_ptr< MCObjectTargetWritercreateObjectTargetWriter () const =0
 
virtual unsigned getMinimumNopSize () const
 Returns the minimum size of a nop in bytes on this target.
 
virtual unsigned getMaximumNopSize (const MCSubtargetInfo &STI) const
 Returns the maximum size of a nop in bytes on this target.
 
virtual bool writeNopData (raw_ostream &OS, uint64_t Count, const MCSubtargetInfo *STI) const =0
 Write an (optimal) nop sequence of Count bytes to the given output.
 
virtual void finishLayout (MCAssembler const &Asm, MCAsmLayout &Layout) const
 Give backend an opportunity to finish layout after relaxation.
 
virtual void handleAssemblerFlag (MCAssemblerFlag Flag)
 Handle any target-specific assembler flags. By default, do nothing.
 
virtual uint32_t generateCompactUnwindEncoding (const MCDwarfFrameInfo *FI, const MCContext *Ctxt) const
 Generate the compact unwind encoding for the CFI instructions.
 
virtual bool isMicroMips (const MCSymbol *Sym) const
 Check whether a given symbol has been flagged with MICROMIPS flag.
 
bool isDarwinCanonicalPersonality (const MCSymbol *Sym) const
 
virtual bool evaluateTargetFixup (const MCAssembler &Asm, const MCAsmLayout &Layout, const MCFixup &Fixup, const MCFragment *DF, const MCValue &Target, const MCSubtargetInfo *STI, uint64_t &Value, bool &WasForced)
 
virtual bool mayNeedRelaxation (const MCInst &Inst, const MCSubtargetInfo &STI) const
 Check whether the given instruction may need relaxation.
 
virtual bool fixupNeedsRelaxationAdvanced (const MCFixup &Fixup, bool Resolved, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout, const bool WasForced) const
 Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.
 

Additional Inherited Members

- Public Attributes inherited from llvm::MCAsmBackend
const llvm::endianness Endian
 
const unsigned RelaxFixupKind
 Fixup kind used for linker relaxation. Currently only used by RISC-V.
 
- Protected Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (llvm::endianness Endian, unsigned RelaxFixupKind=MaxFixupKind)
 

Detailed Description

Definition at line 27 of file LoongArchAsmBackend.h.

Constructor & Destructor Documentation

◆ LoongArchAsmBackend()

llvm::LoongArchAsmBackend::LoongArchAsmBackend ( const MCSubtargetInfo STI,
uint8_t  OSABI,
bool  Is64Bit,
const MCTargetOptions Options 
)
inline

Definition at line 35 of file LoongArchAsmBackend.h.

◆ ~LoongArchAsmBackend()

llvm::LoongArchAsmBackend::~LoongArchAsmBackend ( )
inlineoverride

Definition at line 40 of file LoongArchAsmBackend.h.

Member Function Documentation

◆ applyFixup()

void LoongArchAsmBackend::applyFixup ( const MCAssembler Asm,
const MCFixup Fixup,
const MCValue Target,
MutableArrayRef< char Data,
uint64_t  Value,
bool  IsResolved,
const MCSubtargetInfo STI 
) 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. The STI is present only for fragments of type MCRelaxableFragment and MCDataFragment with hasInstructions() == true.

Implements llvm::MCAsmBackend.

Definition at line 146 of file LoongArchAsmBackend.cpp.

References adjustFixupValue(), llvm::alignTo(), assert(), llvm::Data, llvm::FirstLiteralRelocationKind, Fixup, fixupLeb128(), llvm::FK_Data_leb128, getFixupKindInfo(), I, Info, and llvm::Offset.

◆ createObjectTargetWriter()

std::unique_ptr< MCObjectTargetWriter > LoongArchAsmBackend::createObjectTargetWriter ( ) const
overridevirtual

◆ fixupNeedsRelaxation()

bool llvm::LoongArchAsmBackend::fixupNeedsRelaxation ( const MCFixup Fixup,
uint64_t  Value,
const MCRelaxableFragment DF,
const MCAsmLayout Layout 
) const
inlineoverridevirtual

Simple predicate for targets where !Resolved implies requiring relaxation.

Implements llvm::MCAsmBackend.

Definition at line 64 of file LoongArchAsmBackend.h.

◆ getFixupKind()

std::optional< MCFixupKind > LoongArchAsmBackend::getFixupKind ( StringRef  Name) const
overridevirtual

◆ getFixupKindInfo()

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

◆ getNumFixupKinds()

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

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 70 of file LoongArchAsmBackend.h.

References llvm::LoongArch::NumTargetFixupKinds.

Referenced by getFixupKindInfo().

◆ getSecToAlignSym()

DenseMap< MCSection *, const MCSymbolRefExpr * > & llvm::LoongArchAsmBackend::getSecToAlignSym ( )
inline

Definition at line 95 of file LoongArchAsmBackend.h.

Referenced by shouldInsertFixupForCodeAlign().

◆ getTargetOptions()

const MCTargetOptions & llvm::LoongArchAsmBackend::getTargetOptions ( ) const
inline

Definition at line 94 of file LoongArchAsmBackend.h.

◆ handleAddSubRelocations()

bool LoongArchAsmBackend::handleAddSubRelocations ( const MCAsmLayout Layout,
const MCFragment F,
const MCFixup Fixup,
const MCValue Target,
uint64_t FixedValue 
) const
overridevirtual

◆ relaxDwarfCFA()

bool LoongArchAsmBackend::relaxDwarfCFA ( MCDwarfCallFrameFragment DF,
MCAsmLayout Layout,
bool WasRelaxed 
) const
overridevirtual

◆ relaxDwarfLineAddr()

bool LoongArchAsmBackend::relaxDwarfLineAddr ( MCDwarfLineAddrFragment DF,
MCAsmLayout Layout,
bool WasRelaxed 
) const
overridevirtual

◆ relaxInstruction()

void llvm::LoongArchAsmBackend::relaxInstruction ( MCInst Inst,
const MCSubtargetInfo STI 
) const
inlineoverridevirtual

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

Parameters
[out]InstThe instruction to relax, which is also the relaxed instruction.
STIthe subtarget information for the associated instruction.

Reimplemented from llvm::MCAsmBackend.

Definition at line 78 of file LoongArchAsmBackend.h.

◆ relaxLEB128()

std::pair< bool, bool > LoongArchAsmBackend::relaxLEB128 ( MCLEBFragment LF,
MCAsmLayout Layout,
int64_t &  Value 
) const
overridevirtual

◆ shouldForceRelocation()

bool LoongArchAsmBackend::shouldForceRelocation ( const MCAssembler Asm,
const MCFixup Fixup,
const MCValue Target,
const MCSubtargetInfo STI 
)
overridevirtual

Hook to check if a relocation is needed for some target specific reason.

Reimplemented from llvm::MCAsmBackend.

Definition at line 246 of file LoongArchAsmBackend.cpp.

References llvm::FirstLiteralRelocationKind, Fixup, llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, llvm::FK_Data_leb128, and llvm::MCSubtargetInfo::hasFeature().

◆ shouldInsertExtraNopBytesForCodeAlign()

bool LoongArchAsmBackend::shouldInsertExtraNopBytesForCodeAlign ( const MCAlignFragment AF,
unsigned Size 
)
overridevirtual

Hook to check if extra nop bytes must be inserted for alignment directive.

For some targets this may be necessary in order to support linker relaxation. The number of bytes to insert are returned in Size.

Reimplemented from llvm::MCAsmBackend.

Definition at line 186 of file LoongArchAsmBackend.cpp.

References llvm::MCAlignFragment::getAlignment(), llvm::MCAlignFragment::getMaxBytesToEmit(), llvm::MCAlignFragment::getSubtargetInfo(), llvm::MCSubtargetInfo::hasFeature(), Size, and llvm::Align::value().

Referenced by shouldInsertFixupForCodeAlign().

◆ shouldInsertFixupForCodeAlign()

bool LoongArchAsmBackend::shouldInsertFixupForCodeAlign ( MCAssembler Asm,
const MCAsmLayout Layout,
MCAlignFragment AF 
)
overridevirtual

◆ writeNopData()

bool LoongArchAsmBackend::writeNopData ( raw_ostream OS,
uint64_t  Count,
const MCSubtargetInfo STI 
) 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 434 of file LoongArchAsmBackend.cpp.

References OS, llvm::raw_ostream::write(), and llvm::raw_ostream::write_zeros().


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