LLVM: llvm::ARMAsmBackend Class Reference (original) (raw)

#include "[Target/ARM/MCTargetDesc/ARMAsmBackend.h](ARMAsmBackend%5F8h%5Fsource.html)"

Public Member Functions
ARMAsmBackend (const Target &T, llvm::endianness Endian)
bool hasNOP (const MCSubtargetInfo *STI) const
std::optional< MCFixupKind > getFixupKind (StringRef Name) const override
Map a relocation name used in .reloc to a fixup kind.
MCFixupKindInfo getFixupKindInfo (MCFixupKind Kind) const override
Get information on a fixup kind.
bool shouldForceRelocation (const MCFixup &Fixup, const MCValue &Target)
unsigned adjustFixupValue (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, uint64_t Value, bool IsResolved, MCContext &Ctx, const MCSubtargetInfo *STI) const
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
unsigned getRelaxedOpcode (unsigned Op, const MCSubtargetInfo &STI) const
bool mayNeedRelaxation (unsigned Opcode, ArrayRef< MCOperand > Operands, const MCSubtargetInfo &STI) const override
Check whether the given instruction (encoded as Opcode+Operands) may need relaxation.
const char * reasonForFixupRelaxation (const MCFixup &Fixup, uint64_t Value) const
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.
void relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const override
Relax the instruction in the given fragment to the next wider instruction.
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.
unsigned getPointerSize () const
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 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 finishLayout () 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
void maybeAddReloc (const MCFragment &, const MCFixup &, const MCValue &, uint64_t &Value, bool IsResolved)
virtual bool fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value) const
Simple predicate for targets where !Resolved implies requiring relaxation.
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

Definition at line 20 of file ARMAsmBackend.h.

◆ adjustFixupValue()

Definition at line 419 of file ARMAsmBackend.cpp.

References llvm::MCAsmBackend::Asm, assert(), llvm::dyn_cast(), llvm::MCAsmBackend::Endian, Fixup, llvm::ARM::fixup_arm_adr_pcrel_12, llvm::ARM::fixup_arm_blx, llvm::ARM::fixup_arm_condbl, llvm::ARM::fixup_arm_condbranch, llvm::ARM::fixup_arm_ldst_abs_12, llvm::ARM::fixup_arm_ldst_pcrel_12, llvm::ARM::fixup_arm_mod_imm, llvm::ARM::fixup_arm_movt_hi16, llvm::ARM::fixup_arm_movw_lo16, llvm::ARM::fixup_arm_pcrel_10, llvm::ARM::fixup_arm_pcrel_10_unscaled, llvm::ARM::fixup_arm_pcrel_9, llvm::ARM::fixup_arm_thumb_bcc, llvm::ARM::fixup_arm_thumb_bl, llvm::ARM::fixup_arm_thumb_blx, llvm::ARM::fixup_arm_thumb_br, llvm::ARM::fixup_arm_thumb_cb, llvm::ARM::fixup_arm_thumb_cp, llvm::ARM::fixup_arm_thumb_lower_0_7, llvm::ARM::fixup_arm_thumb_lower_8_15, llvm::ARM::fixup_arm_thumb_upper_0_7, llvm::ARM::fixup_arm_thumb_upper_8_15, llvm::ARM::fixup_arm_uncondbl, llvm::ARM::fixup_arm_uncondbranch, llvm::ARM::fixup_bf_branch, llvm::ARM::fixup_bf_target, llvm::ARM::fixup_bfc_target, llvm::ARM::fixup_bfcsel_else_target, llvm::ARM::fixup_bfl_target, llvm::ARM::fixup_le, llvm::ARM::fixup_t2_adr_pcrel_12, llvm::ARM::fixup_t2_condbranch, llvm::ARM::fixup_t2_ldst_pcrel_12, llvm::ARM::fixup_t2_movt_hi16, llvm::ARM::fixup_t2_movw_lo16, llvm::ARM::fixup_t2_pcrel_10, llvm::ARM::fixup_t2_pcrel_9, llvm::ARM::fixup_t2_so_imm, llvm::ARM::fixup_t2_uncondbranch, llvm::ARM::fixup_thumb_adr_pcrel_10, llvm::ARM::fixup_wls, llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_SecRel_2, llvm::FK_SecRel_4, llvm::MCAsmBackend::getContext(), llvm::ARM_AM::getSOImmVal(), llvm::ARM_AM::getT2SOImmVal(), llvm::MCSubtargetInfo::getTargetTriple(), llvm::MCSubtargetInfo::hasFeature(), I, llvm::isInt(), llvm::MCContext::IsMachO, llvm::Triple::isOSBinFormatCOFF(), llvm::Triple::isOSBinFormatELF(), joinHalfWords(), llvm::little, llvm::maxIntN(), llvm::minIntN(), reasonForFixupRelaxation(), llvm::ARM::S_TLSCALL, swapHalfWords(), and llvm::Value.

Referenced by applyFixup().

◆ applyFixup()

Implements llvm::MCAsmBackend.

Definition at line 1101 of file ARMAsmBackend.cpp.

References adjustFixupValue(), llvm::MCAsmBackend::Asm, assert(), llvm::big, llvm::Data, llvm::MCAsmBackend::Endian, F, Fixup, llvm::MCAsmBackend::getContext(), getFixupKindContainerSizeBytes(), getFixupKindNumBytes(), llvm::MCAsmBackend::getSubtargetInfo(), llvm::mc::isRelocation(), llvm::little, llvm::MCAsmBackend::maybeAddReloc(), and shouldForceRelocation().

◆ evaluateFixup()

◆ fixupNeedsRelaxationAdvanced()

◆ getFixupKind()

◆ getFixupKindInfo()

◆ getPointerSize()

unsigned llvm::ARMAsmBackend::getPointerSize ( ) const inline

◆ getRelaxedOpcode()

◆ hasNOP()

◆ mayNeedRelaxation()

◆ reasonForFixupRelaxation()

Definition at line 217 of file ARMAsmBackend.cpp.

References checkPCRelOffset(), Fixup, llvm::ARM::fixup_arm_thumb_bcc, llvm::ARM::fixup_arm_thumb_br, llvm::ARM::fixup_arm_thumb_cb, llvm::ARM::fixup_arm_thumb_cp, llvm::ARM::fixup_bf_branch, llvm::ARM::fixup_bf_target, llvm::ARM::fixup_bfc_target, llvm::ARM::fixup_bfcsel_else_target, llvm::ARM::fixup_bfl_target, llvm::ARM::fixup_le, llvm::ARM::fixup_thumb_adr_pcrel_10, llvm::ARM::fixup_wls, llvm_unreachable, and llvm::Offset.

Referenced by adjustFixupValue(), and fixupNeedsRelaxationAdvanced().

◆ relaxInstruction()

◆ shouldForceRelocation()

◆ writeNopData()

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