LLVM 20.0.0git
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#include "Target/ARM/MCTargetDesc/ARMAsmBackend.h"
Public Member Functions | |
ARMAsmBackend (const Target &T, bool isThumb, llvm::endianness Endian) | |
unsigned | getNumFixupKinds () const override |
Get the number of target specific fixup kinds. | |
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. | |
const MCFixupKindInfo & | getFixupKindInfo (MCFixupKind Kind) const override |
Get information on a fixup kind. | |
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. | |
unsigned | adjustFixupValue (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, uint64_t Value, bool IsResolved, MCContext &Ctx, const MCSubtargetInfo *STI) const |
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. | |
unsigned | getRelaxedOpcode (unsigned Op, const MCSubtargetInfo &STI) const |
bool | mayNeedRelaxation (const MCInst &Inst, const MCSubtargetInfo &STI) const override |
Check whether the given instruction may need relaxation. | |
const char * | reasonForFixupRelaxation (const MCFixup &Fixup, uint64_t Value) const |
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 | writeNopData (raw_ostream &OS, uint64_t Count, const MCSubtargetInfo *STI) const override |
Write an (optimal) nop sequence of Count bytes to the given output. | |
void | handleAssemblerFlag (MCAssemblerFlag Flag) override |
Handle any target-specific assembler flags. By default, do nothing. | |
unsigned | getPointerSize () const |
bool | isThumb () const |
void | setIsThumb (bool it) |
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 | 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 | 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 | 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 20 of file ARMAsmBackend.h.
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inline |
Definition at line 23 of file ARMAsmBackend.h.
unsigned ARMAsmBackend::adjustFixupValue | ( | const MCAssembler & | Asm, |
const MCFixup & | Fixup, | ||
const MCValue & | Target, | ||
uint64_t | Value, | ||
bool | IsResolved, | ||
MCContext & | Ctx, | ||
const MCSubtargetInfo * | STI | ||
) | const |
Definition at line 442 of file ARMAsmBackend.cpp.
References A, assert(), 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::ARM_AM::getSOImmVal(), llvm::ARM_AM::getT2SOImmVal(), llvm::MCSubtargetInfo::getTargetTriple(), llvm::MCSubtargetInfo::hasFeature(), I, llvm::Triple::isOSBinFormatCOFF(), llvm::Triple::isOSBinFormatELF(), joinHalfWords(), llvm::little, reasonForFixupRelaxation(), llvm::MCContext::reportError(), swapHalfWords(), and llvm::MCSymbolRefExpr::VK_TLSCALL.
Referenced by applyFixup().
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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 1106 of file ARMAsmBackend.cpp.
References adjustFixupValue(), assert(), llvm::big, llvm::Data, llvm::MCAsmBackend::Endian, llvm::FirstLiteralRelocationKind, Fixup, getFixupKindContainerSizeBytes(), getFixupKindNumBytes(), Idx, llvm::little, and llvm::Offset.
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overridevirtual |
Simple predicate for targets where !Resolved implies requiring relaxation.
Reimplemented from llvm::MCAsmBackend.
Definition at line 339 of file ARMAsmBackend.cpp.
References Fixup, and reasonForFixupRelaxation().
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overridevirtual |
Map a relocation name used in .reloc to a fixup kind.
Reimplemented from llvm::MCAsmBackend.
Reimplemented in llvm::ARMAsmBackendELF.
Definition at line 49 of file ARMAsmBackend.cpp.
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overridevirtual |
Get information on a fixup kind.
Reimplemented from llvm::MCAsmBackend.
Definition at line 69 of file ARMAsmBackend.cpp.
References assert(), llvm::MCAsmBackend::Endian, llvm::FirstLiteralRelocationKind, llvm::FirstTargetFixupKind, llvm::FK_NONE, llvm::MCFixupKindInfo::FKF_IsAlignedDownTo32Bits, llvm::MCFixupKindInfo::FKF_IsPCRel, llvm::MCAsmBackend::getFixupKindInfo(), getNumFixupKinds(), llvm::little, and llvm::ARM::NumTargetFixupKinds.
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inlineoverridevirtual |
Get the number of target specific fixup kinds.
Implements llvm::MCAsmBackend.
Definition at line 26 of file ARMAsmBackend.h.
References llvm::ARM::NumTargetFixupKinds.
Referenced by getFixupKindInfo().
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inline |
Definition at line 71 of file ARMAsmBackend.h.
unsigned ARMAsmBackend::getRelaxedOpcode | ( | unsigned | Op, |
const MCSubtargetInfo & | STI | ||
) | const |
Definition at line 223 of file ARMAsmBackend.cpp.
References llvm::MCSubtargetInfo::hasFeature().
Referenced by mayNeedRelaxation(), and relaxInstruction().
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overridevirtual |
Handle any target-specific assembler flags. By default, do nothing.
Reimplemented from llvm::MCAsmBackend.
Definition at line 210 of file ARMAsmBackend.cpp.
References llvm::MCAF_Code16, llvm::MCAF_Code32, and setIsThumb().
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inline |
Definition at line 30 of file ARMAsmBackend.h.
References llvm::MCSubtargetInfo::hasFeature().
Referenced by writeNopData().
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inline |
Definition at line 72 of file ARMAsmBackend.h.
Referenced by writeNopData().
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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 246 of file ARMAsmBackend.cpp.
References llvm::MCInst::getOpcode(), and getRelaxedOpcode().
const char * ARMAsmBackend::reasonForFixupRelaxation | ( | const MCFixup & | Fixup, |
uint64_t | Value | ||
) | const |
Definition at line 260 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 fixupNeedsRelaxation().
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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 344 of file ARMAsmBackend.cpp.
References llvm::MCInst::addOperand(), llvm::MCOperand::createImm(), llvm::MCOperand::createReg(), llvm::MCInst::dump_pretty(), llvm::MCInst::getOpcode(), getRelaxedOpcode(), OS, llvm::report_fatal_error(), and llvm::MCInst::setOpcode().
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inline |
Definition at line 73 of file ARMAsmBackend.h.
Referenced by handleAssemblerFlag().
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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 934 of file ARMAsmBackend.cpp.
References A, assert(), llvm::FirstLiteralRelocationKind, Fixup, llvm::ARM::fixup_arm_blx, llvm::ARM::fixup_arm_condbl, llvm::ARM::fixup_arm_thumb_bl, llvm::ARM::fixup_arm_thumb_blx, llvm::ARM::fixup_arm_thumb_br, llvm::ARM::fixup_arm_uncondbl, llvm::ARM::fixup_arm_uncondbranch, llvm::ARM::fixup_t2_condbranch, llvm::ARM::fixup_t2_uncondbranch, llvm::ELF::STT_FUNC, llvm::ELF::STT_GNU_IFUNC, and Sym.
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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 375 of file ARMAsmBackend.cpp.
References llvm::MCAsmBackend::Endian, hasNOP(), isThumb(), OS, llvm::raw_ostream::write(), and llvm::support::endian::write().