LLVM 20.0.0git
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#include "Target/RISCV/MCTargetDesc/RISCVAsmBackend.h"
Public Member Functions | |
RISCVAsmBackend (const MCSubtargetInfo &STI, uint8_t OSABI, bool Is64Bit, const MCTargetOptions &Options) | |
~RISCVAsmBackend () override=default | |
void | setForceRelocs () |
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, 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 | evaluateTargetFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCFragment *DF, const MCValue &Target, const MCSubtargetInfo *STI, uint64_t &Value, bool &WasForced) override |
bool | handleAddSubRelocations (const MCAssembler &Asm, 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. | |
std::unique_ptr< MCObjectTargetWriter > | createObjectTargetWriter () const override |
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 | 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. | |
unsigned | getNumFixupKinds () const override |
Get the number of target specific fixup kinds. | |
std::optional< MCFixupKind > | getFixupKind (StringRef Name) const override |
Map a relocation name used in .reloc to a fixup kind. | |
const MCFixupKindInfo & | getFixupKindInfo (MCFixupKind Kind) const override |
Get information on a fixup kind. | |
bool | mayNeedRelaxation (const MCInst &Inst, const MCSubtargetInfo &STI) const override |
Check whether the given instruction may need relaxation. | |
unsigned | getRelaxedOpcode (unsigned Op) const |
void | relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const override |
Relax the instruction in the given fragment to the next wider instruction. | |
bool | relaxDwarfLineAddr (const MCAssembler &Asm, MCDwarfLineAddrFragment &DF, bool &WasRelaxed) const override |
bool | relaxDwarfCFA (const MCAssembler &Asm, MCDwarfCallFrameFragment &DF, bool &WasRelaxed) const override |
std::pair< bool, bool > | relaxLEB128 (const MCAssembler &Asm, MCLEBFragment &LF, int64_t &Value) 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. | |
const MCTargetOptions & | getTargetOptions () const |
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 bool | fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value) const |
Simple predicate for targets where !Resolved implies requiring relaxation. | |
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 24 of file RISCVAsmBackend.h.
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inline |
Definition at line 32 of file RISCVAsmBackend.h.
References llvm::MCSubtargetInfo::getFeatureBits(), llvm::MCSubtargetInfo::getTargetTriple(), and llvm::RISCVFeatures::validate().
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overridedefault |
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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 625 of file RISCVAsmBackend.cpp.
References adjustFixupValue(), llvm::alignTo(), assert(), llvm::Data, llvm::FirstLiteralRelocationKind, Fixup, getFixupKindInfo(), Info, and llvm::Offset.
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overridevirtual |
Implements llvm::MCAsmBackend.
Definition at line 711 of file RISCVAsmBackend.cpp.
References llvm::createRISCVELFObjectWriter().
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overridevirtual |
Reimplemented from llvm::MCAsmBackend.
Definition at line 519 of file RISCVAsmBackend.cpp.
References A, DF, llvm::MCExpr::evaluateAsRelocatable(), Fixup, llvm::RISCV::fixup_riscv_pcrel_hi20, llvm::RISCV::fixup_riscv_pcrel_lo12_i, llvm::RISCV::fixup_riscv_pcrel_lo12_s, llvm::RISCV::fixup_riscv_tlsdesc_hi20, llvm::MCValue::getConstant(), llvm::MCFixup::getOffset(), llvm::MCValue::getSymA(), llvm::MCValue::getSymB(), llvm::MCFixup::getValue(), llvm::MCSymbol::isUndefined(), llvm_unreachable, shouldForceRelocation(), and llvm::MCSymbolRefExpr::VK_None.
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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 141 of file RISCVAsmBackend.cpp.
References Fixup, llvm::RISCV::fixup_riscv_branch, llvm::RISCV::fixup_riscv_rvc_branch, llvm::RISCV::fixup_riscv_rvc_jump, llvm::Offset, and RelaxBranches.
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overridevirtual |
Map a relocation name used in .reloc to a fixup kind.
Reimplemented from llvm::MCAsmBackend.
Definition at line 39 of file RISCVAsmBackend.cpp.
References llvm::StringSwitch< T, R >::Case(), llvm::StringSwitch< T, R >::Default(), llvm::FirstLiteralRelocationKind, llvm::MCSubtargetInfo::getTargetTriple(), llvm::Triple::isOSBinFormatELF(), and Name.
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overridevirtual |
Get information on a fixup kind.
Reimplemented from llvm::MCAsmBackend.
Definition at line 57 of file RISCVAsmBackend.cpp.
References assert(), llvm::FirstLiteralRelocationKind, llvm::FirstTargetFixupKind, llvm::FK_NONE, llvm::MCFixupKindInfo::FKF_IsPCRel, llvm::MCFixupKindInfo::FKF_IsTarget, llvm::MCAsmBackend::getFixupKindInfo(), getNumFixupKinds(), and llvm::RISCV::NumTargetFixupKinds.
Referenced by applyFixup().
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inlineoverridevirtual |
Get the number of target specific fixup kinds.
Implements llvm::MCAsmBackend.
Definition at line 77 of file RISCVAsmBackend.h.
References llvm::RISCV::NumTargetFixupKinds.
Referenced by getFixupKindInfo().
Definition at line 347 of file RISCVAsmBackend.cpp.
Referenced by mayNeedRelaxation(), and relaxInstruction().
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inline |
Definition at line 102 of file RISCVAsmBackend.h.
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overridevirtual |
Reimplemented from llvm::MCAsmBackend.
Definition at line 579 of file RISCVAsmBackend.cpp.
References A, B, llvm::MCFixup::create(), F, llvm::FirstLiteralRelocationKind, Fixup, llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, llvm::FK_Data_leb128, llvm::MCValue::get(), and llvm_unreachable.
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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 373 of file RISCVAsmBackend.cpp.
References llvm::MCInst::getOpcode(), and getRelaxedOpcode().
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overridevirtual |
Reimplemented from llvm::MCAsmBackend.
Definition at line 270 of file RISCVAsmBackend.cpp.
References assert(), llvm::MCFixup::create(), llvm::Data, DF, llvm::MCExpr::evaluateKnownAbsolute(), llvm::FirstLiteralRelocationKind, Fixup, llvm::MCBinaryExpr::getLHS(), llvm::MCBinaryExpr::getRHS(), llvm::isUIntN(), llvm::little, llvm_unreachable, llvm::Offset, and OS.
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overridevirtual |
Reimplemented from llvm::MCAsmBackend.
Definition at line 204 of file RISCVAsmBackend.cpp.
References assert(), llvm::CallingConv::C, llvm::MCFixup::create(), llvm::Data, DF, llvm::encodeSLEB128(), llvm::encodeULEB128(), llvm::MCExpr::evaluateKnownAbsolute(), Fixup, llvm::MCBinaryExpr::getLHS(), llvm::RISCV::getRelocPairForSize(), llvm::MCBinaryExpr::getRHS(), INT64_MAX, llvm::little, llvm::Offset, OS, llvm::raw_ostream::tell(), and llvm::raw_ostream::write_zeros().
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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 175 of file RISCVAsmBackend.cpp.
References llvm::MCInst::addOperand(), assert(), llvm::MCInst::getOpcode(), llvm::MCInst::getOperand(), getRelaxedOpcode(), llvm_unreachable, llvm::MCInst::setOpcode(), Success, and llvm::RISCVRVC::uncompress().
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overridevirtual |
Reimplemented from llvm::MCAsmBackend.
Definition at line 332 of file RISCVAsmBackend.cpp.
References llvm::MCFixup::create(), llvm::MCExpr::evaluateKnownAbsolute(), llvm::FK_Data_leb128, llvm::MCEncodedFragmentWithFixups< ContentsSize, FixupsSize >::getFixups(), llvm::MCExpr::getLoc(), llvm::MCLEBFragment::getValue(), llvm::MCLEBFragment::isSigned(), and ULEB128Reloc.
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inline |
Definition at line 40 of file RISCVAsmBackend.h.
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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 114 of file RISCVAsmBackend.cpp.
References llvm::FirstLiteralRelocationKind, Fixup, llvm::RISCV::fixup_riscv_got_hi20, llvm::RISCV::fixup_riscv_tls_gd_hi20, llvm::RISCV::fixup_riscv_tls_got_hi20, llvm::RISCV::fixup_riscv_tlsdesc_hi20, llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, llvm::FK_Data_leb128, and llvm::MCSubtargetInfo::hasFeature().
Referenced by evaluateTargetFixup().
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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 659 of file RISCVAsmBackend.cpp.
References llvm::MCAlignFragment::getAlignment(), llvm::MCAlignFragment::getSubtargetInfo(), llvm::MCSubtargetInfo::hasFeature(), Size, and llvm::Align::value().
Referenced by shouldInsertFixupForCodeAlign().
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overridevirtual |
Hook which indicates if the target requires a fixup to be generated when handling an align directive in an executable section.
Reimplemented from llvm::MCAsmBackend.
Definition at line 683 of file RISCVAsmBackend.cpp.
References llvm::MCConstantExpr::create(), llvm::MCFixup::create(), Fixup, llvm::RISCV::fixup_riscv_align, llvm::MCValue::get(), llvm::MCAlignFragment::getSubtargetInfo(), llvm::MCSubtargetInfo::hasFeature(), and shouldInsertExtraNopBytesForCodeAlign().
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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 378 of file RISCVAsmBackend.cpp.
References llvm::MCSubtargetInfo::hasFeature(), OS, and llvm::raw_ostream::write().