LLVM 22.0.0git
Public Member Functions | List of all members
llvm::CSKYAsmBackend Class Reference

#include "Target/CSKY/MCTargetDesc/CSKYAsmBackend.h"

Inheritance diagram for llvm::CSKYAsmBackend:
[legend]

Public Member Functions

 CSKYAsmBackend (const MCSubtargetInfo &STI, const MCTargetOptions &OP)
std::optional< bool > evaluateFixup (const MCFragment &, MCFixup &, MCValue &, uint64_t &) override
void applyFixup (const MCFragment &, const MCFixup &, const MCValue &Target, uint8_t *Data, uint64_t Value, bool IsResolved) override
MCFixupKindInfo getFixupKindInfo (MCFixupKind Kind) const override
 Get information on a fixup kind.
bool fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value) const override
 Simple predicate for targets where !Resolved implies requiring relaxation.
bool mayNeedRelaxation (unsigned Opcode, ArrayRef< MCOperand > Operands, const MCSubtargetInfo &STI) const override
 Check whether the given instruction (encoded as Opcode+Operands) may need relaxation.
void relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const override
 Relax the instruction in the given fragment to the next wider instruction.
bool fixupNeedsRelaxationAdvanced (const MCFragment &, const MCFixup &, const MCValue &, uint64_t, bool) const override
 Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.
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.
bool shouldForceRelocation (const MCFixup &Fixup, const MCValue &Target)
std::unique_ptr< MCObjectTargetWriter > createObjectTargetWriter () const override
Public Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (const MCAsmBackend &)=delete
MCAsmBackend & operator= (const MCAsmBackend &)=delete
virtual ~MCAsmBackend ()
void setAssembler (MCAssembler *A)
MCContext & getContext () const
bool allowAutoPadding () const
 Return true if this target might automatically pad instructions and thus need to emit padding enable/disable directives around sensative code.
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< MCObjectWriter > createObjectWriter (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< MCObjectWriter > createDwoObjectWriter (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 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 finishLayout (const MCAssembler &Asm) const
virtual uint64_t generateCompactUnwindEncoding (const MCDwarfFrameInfo *FI, const MCContext *Ctxt) const
 Generate the compact unwind encoding for the CFI instructions.
bool isDarwinCanonicalPersonality (const MCSymbol *Sym) const
virtual std::optional< MCFixupKind > getFixupKind (StringRef Name) const
 Map a relocation name used in .reloc to a fixup kind.
void maybeAddReloc (const MCFragment &, const MCFixup &, const MCValue &, uint64_t &Value, bool IsResolved)
virtual bool relaxAlign (MCFragment &F, unsigned &Size)
virtual bool relaxDwarfLineAddr (MCFragment &) const
virtual bool relaxDwarfCFA (MCFragment &) const
virtual bool relaxSFrameCFA (MCFragment &) const
virtual std::pair< bool, bool > relaxLEB128 (MCFragment &, int64_t &Value) const

Additional Inherited Members

Static Public Member Functions inherited from llvm::MCAsmBackend
static const MCSubtargetInfo * getSubtargetInfo (const MCFragment &F)
Public Attributes inherited from llvm::MCAsmBackend
const llvm::endianness Endian
Protected Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (llvm::endianness Endian)
Protected Attributes inherited from llvm::MCAsmBackend
MCAssembler * Asm = nullptr
bool AllowAutoPadding = false
bool AllowEnhancedRelaxation = false

Detailed Description

Definition at line 19 of file CSKYAsmBackend.h.

Constructor & Destructor Documentation

◆ CSKYAsmBackend()

llvm::CSKYAsmBackend::CSKYAsmBackend ( const MCSubtargetInfo & STI,
const MCTargetOptions & OP )
inline

Definition at line 22 of file CSKYAsmBackend.h.

References llvm::little, llvm::MCAsmBackend::MCAsmBackend(), and OP.

Member Function Documentation

◆ applyFixup()

void CSKYAsmBackend::applyFixup ( const MCFragment & F,
const MCFixup & Fixup,
const MCValue & Target,
uint8_t * Data,
uint64_t Value,
bool IsResolved )
overridevirtual

Implements llvm::MCAsmBackend.

Definition at line 199 of file CSKYAsmBackend.cpp.

References adjustFixupValue(), llvm::alignTo(), assert(), llvm::Data, llvm::MCAsmBackend::Endian, F, llvm::FirstTargetFixupKind, Fixup, llvm::MCAsmBackend::getContext(), getFixupKindInfo(), I, llvm::mc::isRelocation(), llvm::little, llvm::MCAsmBackend::maybeAddReloc(), and shouldForceRelocation().

◆ createObjectTargetWriter()

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

Implements llvm::MCAsmBackend.

Definition at line 23 of file CSKYAsmBackend.cpp.

References llvm::createCSKYELFObjectWriter().

◆ evaluateFixup()

std::optional< bool > CSKYAsmBackend::evaluateFixup ( const MCFragment & F,
MCFixup & Fixup,
MCValue & ,
uint64_t & Value )
overridevirtual

Reimplemented from llvm::MCAsmBackend.

Definition at line 184 of file CSKYAsmBackend.cpp.

References llvm::MCAsmBackend::Asm, F, Fixup, llvm::CSKY::fixup_csky_pcrel_uimm16_scale4, llvm::CSKY::fixup_csky_pcrel_uimm7_scale4, and llvm::CSKY::fixup_csky_pcrel_uimm8_scale4.

◆ fixupNeedsRelaxation()

bool CSKYAsmBackend::fixupNeedsRelaxation ( const MCFixup & Fixup,
uint64_t Value ) const
overridevirtual

Simple predicate for targets where !Resolved implies requiring relaxation.

Reimplemented from llvm::MCAsmBackend.

Definition at line 279 of file CSKYAsmBackend.cpp.

References Fixup.

◆ fixupNeedsRelaxationAdvanced()

bool CSKYAsmBackend::fixupNeedsRelaxationAdvanced ( const MCFragment & ,
const MCFixup & Fixup,
const MCValue & ,
uint64_t Value,
bool Resolved ) const
overridevirtual

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

Reimplemented from llvm::MCAsmBackend.

Definition at line 160 of file CSKYAsmBackend.cpp.

References Fixup, llvm::CSKY::fixup_csky_pcrel_imm10_scale2, llvm::CSKY::fixup_csky_pcrel_imm16_scale2, llvm::CSKY::fixup_csky_pcrel_imm26_scale2, llvm::CSKY::fixup_csky_pcrel_uimm7_scale4, llvm::isShiftedInt(), and llvm::Offset.

◆ getFixupKindInfo()

MCFixupKindInfo CSKYAsmBackend::getFixupKindInfo ( MCFixupKind Kind) const
overridevirtual

Get information on a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Definition at line 27 of file CSKYAsmBackend.cpp.

References assert(), llvm::FirstTargetFixupKind, llvm::CSKY::fixup_csky_addr32, llvm::CSKY::fixup_csky_addr_hi16, llvm::CSKY::fixup_csky_addr_lo16, llvm::CSKY::fixup_csky_doffset_imm18, llvm::CSKY::fixup_csky_doffset_imm18_scale2, llvm::CSKY::fixup_csky_doffset_imm18_scale4, llvm::CSKY::fixup_csky_got32, llvm::CSKY::fixup_csky_got_imm18_scale4, llvm::CSKY::fixup_csky_gotoff, llvm::CSKY::fixup_csky_gotpc, llvm::CSKY::fixup_csky_pcrel_imm10_scale2, llvm::CSKY::fixup_csky_pcrel_imm16_scale2, llvm::CSKY::fixup_csky_pcrel_imm18_scale2, llvm::CSKY::fixup_csky_pcrel_imm26_scale2, llvm::CSKY::fixup_csky_pcrel_uimm16_scale4, llvm::CSKY::fixup_csky_pcrel_uimm7_scale4, llvm::CSKY::fixup_csky_pcrel_uimm8_scale4, llvm::CSKY::fixup_csky_plt32, llvm::CSKY::fixup_csky_plt_imm18_scale4, llvm::MCAsmBackend::getFixupKindInfo(), llvm::mc::isRelocation(), llvm::CSKY::NumTargetFixupKinds, and llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::size().

Referenced by applyFixup().

◆ mayNeedRelaxation()

bool CSKYAsmBackend::mayNeedRelaxation ( unsigned Opcode,
ArrayRef< MCOperand > Operands,
const MCSubtargetInfo & STI ) const
overridevirtual

Check whether the given instruction (encoded as Opcode+Operands) may need relaxation.

Reimplemented from llvm::MCAsmBackend.

Definition at line 242 of file CSKYAsmBackend.cpp.

References llvm::MCSubtargetInfo::hasFeature().

◆ relaxInstruction()

void CSKYAsmBackend::relaxInstruction ( MCInst & Inst,
const MCSubtargetInfo & STI ) const
overridevirtual

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 284 of file CSKYAsmBackend.cpp.

References llvm::MCInst::addOperand(), llvm::MCInst::dump(), llvm::MCInst::getOpcode(), llvm::MCInst::getOperand(), llvm::MCSubtargetInfo::hasFeature(), LLVM_DEBUG, llvm_unreachable, and llvm::MCInst::setOpcode().

◆ shouldForceRelocation()

bool CSKYAsmBackend::shouldForceRelocation ( const MCFixup & Fixup,
const MCValue & Target )

Definition at line 263 of file CSKYAsmBackend.cpp.

References Fixup, llvm::CSKY::fixup_csky_doffset_imm18, llvm::CSKY::fixup_csky_doffset_imm18_scale2, and llvm::CSKY::fixup_csky_doffset_imm18_scale4.

Referenced by applyFixup().

◆ writeNopData()

bool CSKYAsmBackend::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 339 of file CSKYAsmBackend.cpp.

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

The documentation for this class was generated from the following files:
Generated on for LLVM by doxygen 1.14.0