LLVM 20.0.0git
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#include "Target/CSKY/MCTargetDesc/CSKYAsmBackend.h"
Public Member Functions | |
CSKYAsmBackend (const MCSubtargetInfo &STI, const MCTargetOptions &OP) | |
unsigned int | getNumFixupKinds () const override |
Get the number of target specific fixup kinds. | |
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. | |
const 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. | |
void | relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const override |
Relax the instruction in the given fragment to the next wider instruction. | |
bool | mayNeedRelaxation (const MCInst &Inst, const MCSubtargetInfo &STI) const override |
Check whether the given instruction may need relaxation. | |
bool | fixupNeedsRelaxationAdvanced (const MCAssembler &Asm, const MCFixup &Fixup, bool Resolved, uint64_t Value, const MCRelaxableFragment *DF, const bool WasForced) 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 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. | |
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 () |
bool | allowLinkerRelaxation () const |
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< 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 std::unique_ptr< MCObjectTargetWriter > | createObjectTargetWriter () 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) 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 uint64_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 std::optional< MCFixupKind > | getFixupKind (StringRef Name) const |
Map a relocation name used in .reloc to a fixup kind. | |
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 | relaxDwarfLineAddr (const MCAssembler &Asm, MCDwarfLineAddrFragment &DF, bool &WasRelaxed) const |
virtual bool | relaxDwarfCFA (const MCAssembler &Asm, MCDwarfCallFrameFragment &DF, bool &WasRelaxed) const |
virtual std::pair< bool, bool > | relaxLEB128 (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. | |
Protected Member Functions inherited from llvm::MCAsmBackend | |
MCAsmBackend (llvm::endianness Endian, unsigned RelaxFixupKind=MaxFixupKind) | |
Definition at line 19 of file CSKYAsmBackend.h.
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inline |
Definition at line 22 of file CSKYAsmBackend.h.
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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 200 of file CSKYAsmBackend.cpp.
References adjustFixupValue(), llvm::alignTo(), assert(), llvm::Data, llvm::MCAsmBackend::Endian, llvm::FirstLiteralRelocationKind, llvm::FirstTargetFixupKind, Fixup, getFixupKindInfo(), I, Idx, Info, llvm::little, and llvm::Offset.
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overridevirtual |
Implements llvm::MCAsmBackend.
Definition at line 23 of file CSKYAsmBackend.cpp.
References llvm::createCSKYELFObjectWriter().
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overridevirtual |
Simple predicate for targets where !Resolved implies requiring relaxation.
Reimplemented from llvm::MCAsmBackend.
Definition at line 286 of file CSKYAsmBackend.cpp.
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overridevirtual |
Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.
Reimplemented from llvm::MCAsmBackend.
Definition at line 173 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, and llvm::Offset.
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overridevirtual |
Get information on a fixup kind.
Reimplemented from llvm::MCAsmBackend.
Definition at line 28 of file CSKYAsmBackend.cpp.
References assert(), llvm::FirstLiteralRelocationKind, 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::FK_NONE, llvm::MCFixupKindInfo::FKF_IsAlignedDownTo32Bits, llvm::MCFixupKindInfo::FKF_IsPCRel, llvm::MCAsmBackend::getFixupKindInfo(), getNumFixupKinds(), llvm::CSKY::NumTargetFixupKinds, and llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::size().
Referenced by applyFixup().
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inlineoverridevirtual |
Get the number of target specific fixup kinds.
Implements llvm::MCAsmBackend.
Definition at line 25 of file CSKYAsmBackend.h.
References llvm::CSKY::NumTargetFixupKinds.
Referenced by getFixupKindInfo().
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overridevirtual |
Check whether the given instruction may need relaxation.
Inst | - The instruction to test. |
STI | - The MCSubtargetInfo in effect when the instruction was encoded. |
Reimplemented from llvm::MCAsmBackend.
Definition at line 241 of file CSKYAsmBackend.cpp.
References llvm::MCInst::getOpcode(), and llvm::MCSubtargetInfo::hasFeature().
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overridevirtual |
Relax the instruction in the given fragment to the next wider instruction.
[out] | Inst | The instruction to relax, which is also the relaxed instruction. |
STI | the subtarget information for the associated instruction. |
Reimplemented from llvm::MCAsmBackend.
Definition at line 291 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().
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overridevirtual |
Hook to check if a relocation is needed for some target specific reason.
Reimplemented from llvm::MCAsmBackend.
Definition at line 262 of file CSKYAsmBackend.cpp.
References llvm::FirstLiteralRelocationKind, Fixup, 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_plt32, and llvm::CSKY::fixup_csky_plt_imm18_scale4.
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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.
Implements llvm::MCAsmBackend.
Definition at line 346 of file CSKYAsmBackend.cpp.
References OS, and llvm::raw_ostream::write_zeros().