LLVM 20.0.0git
Public Member Functions | List of all members
llvm::MipsAsmBackend Class Reference

#include "Target/Mips/MCTargetDesc/MipsAsmBackend.h"

Inheritance diagram for llvm::MipsAsmBackend:
Inheritance graph
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Public Member Functions

 MipsAsmBackend (const Target &T, const MCRegisterInfo &MRI, const Triple &TT, StringRef CPU, bool N32)
 
std::unique_ptr< MCObjectTargetWritercreateObjectTargetWriter () 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
 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.
 
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.
 
unsigned getNumFixupKinds () const override
 Get the number of target specific fixup kinds.
 
bool writeNopData (raw_ostream &OS, uint64_t Count, const MCSubtargetInfo *STI) const override
 WriteNopData - Write an (optimal) nop sequence of Count bytes to the given output.
 
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 isMicroMips (const MCSymbol *Sym) const override
 Check whether a given symbol has been flagged with MICROMIPS flag.
 
- 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 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 bool finishLayout (const MCAssembler &Asm) const
 
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 shouldInsertExtraNopBytesForCodeAlign (const MCAlignFragment &AF, unsigned &Size)
 Hook to check if extra nop bytes must be inserted for alignment directive.
 
virtual bool shouldInsertFixupForCodeAlign (MCAssembler &Asm, MCAlignFragment &AF)
 Hook which indicates if the target requires a fixup to be generated when handling an align directive in an executable section.
 
virtual bool evaluateTargetFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCFragment *DF, const MCValue &Target, const MCSubtargetInfo *STI, uint64_t &Value, bool &WasForced)
 
virtual bool handleAddSubRelocations (const MCAssembler &Asm, const MCFragment &F, const MCFixup &Fixup, const MCValue &Target, uint64_t &FixedValue) const
 
virtual bool mayNeedRelaxation (const MCInst &Inst, const MCSubtargetInfo &STI) const
 Check whether the given instruction may need relaxation.
 
virtual bool fixupNeedsRelaxationAdvanced (const MCAssembler &Asm, const MCFixup &Fixup, bool Resolved, uint64_t Value, const MCRelaxableFragment *DF, const bool WasForced) const
 Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.
 
virtual bool fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value) const
 Simple predicate for targets where !Resolved implies requiring relaxation.
 
virtual void relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const
 Relax the instruction in the given fragment to the next wider instruction.
 
virtual bool relaxDwarfLineAddr (const MCAssembler &Asm, MCDwarfLineAddrFragment &DF, bool &WasRelaxed) const
 
virtual bool relaxDwarfCFA (const MCAssembler &Asm, MCDwarfCallFrameFragment &DF, bool &WasRelaxed) const
 
virtual std::pair< bool, boolrelaxLEB128 (const MCAssembler &Asm, MCLEBFragment &LF, int64_t &Value) const
 

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 28 of file MipsAsmBackend.h.

Constructor & Destructor Documentation

◆ MipsAsmBackend()

llvm::MipsAsmBackend::MipsAsmBackend ( const Target T,
const MCRegisterInfo MRI,
const Triple TT,
StringRef  CPU,
bool  N32 
)
inline

Definition at line 33 of file MipsAsmBackend.h.

Member Function Documentation

◆ applyFixup()

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

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.

Implements llvm::MCAsmBackend.

Definition at line 244 of file MipsAsmBackend.cpp.

References adjustFixupValue(), calculateMMLEIndex(), llvm::Data, llvm::MCAsmBackend::Endian, Fixup, llvm::Mips::fixup_MICROMIPS_PC10_S1, llvm::Mips::fixup_Mips_16, llvm::Mips::fixup_Mips_64, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, getFixupKindInfo(), Idx, llvm::little, needsMMLEByteOrder(), llvm::Offset, and llvm::MCFixupKindInfo::TargetSize.

◆ createObjectTargetWriter()

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

Implements llvm::MCAsmBackend.

Definition at line 220 of file MipsAsmBackend.cpp.

References llvm::createMipsELFObjectWriter().

◆ getFixupKind()

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

◆ getFixupKindInfo()

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

◆ getNumFixupKinds()

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

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 50 of file MipsAsmBackend.h.

References llvm::Mips::NumTargetFixupKinds.

Referenced by getFixupKindInfo().

◆ isMicroMips()

bool MipsAsmBackend::isMicroMips ( const MCSymbol Sym) const
overridevirtual

Check whether a given symbol has been flagged with MICROMIPS flag.

Reimplemented from llvm::MCAsmBackend.

Definition at line 592 of file MipsAsmBackend.cpp.

References llvm::ELF::STO_MIPS_MICROMIPS, and Sym.

◆ shouldForceRelocation()

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

◆ writeNopData()

bool MipsAsmBackend::writeNopData ( raw_ostream OS,
uint64_t  Count,
const MCSubtargetInfo STI 
) const
overridevirtual

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.

Implements llvm::MCAsmBackend.

Definition at line 533 of file MipsAsmBackend.cpp.

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


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