llvm::ARMAsmBackendDarwin Class Reference

#include "Target/ARM/MCTargetDesc/ARMAsmBackendDarwin.h"

Inheritance diagram for llvm::ARMAsmBackendDarwin:

Public Member Functions
	ARMAsmBackendDarwin (const Target &T, const MCSubtargetInfo &STI, const MCRegisterInfo &MRI)
std::unique_ptr< MCObjectTargetWriter >	createObjectTargetWriter () const override
uint64_t	generateCompactUnwindEncoding (const MCDwarfFrameInfo *FI, const MCContext *Ctxt) const override
	Generate compact unwind encoding for the function based on the CFI instructions.
Public Member Functions inherited from llvm::ARMAsmBackend
	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 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
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 std::pair< bool, bool >	relaxLEB128 (MCFragment &, int64_t &Value) const

Public Attributes
const MachO::CPUSubTypeARM	Subtype
Public Attributes inherited from llvm::MCAsmBackend
const llvm::endianness	Endian

Additional Inherited Members
Static Public Member Functions inherited from llvm::MCAsmBackend
static const MCSubtargetInfo *	getSubtargetInfo (const MCFragment &F)
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 18 of file ARMAsmBackendDarwin.h.

Constructor & Destructor Documentation

ARMAsmBackendDarwin()

llvm::ARMAsmBackendDarwin::ARMAsmBackendDarwin ( const Target & T, const MCSubtargetInfo & STI, const MCRegisterInfo & MRI )

inline

Definition at line 23 of file ARMAsmBackendDarwin.h.

References llvm::ARMAsmBackend::ARMAsmBackend(), llvm::cantFail(), getCPUSubType(), llvm::little, Subtype, and T.

Member Function Documentation

createObjectTargetWriter()

std::unique_ptr< MCObjectTargetWriter > llvm::ARMAsmBackendDarwin::createObjectTargetWriter ( ) const

inlineoverridevirtual

Implements llvm::MCAsmBackend.

Definition at line 31 of file ARMAsmBackendDarwin.h.

References llvm::cantFail(), llvm::createARMMachObjectWriter(), llvm::MachO::getCPUType(), and Subtype.

generateCompactUnwindEncoding()

uint64_t ARMAsmBackendDarwin::generateCompactUnwindEncoding ( const MCDwarfFrameInfo * FI, const MCContext * Ctxt ) const

overridevirtual

Generate compact unwind encoding for the function based on the CFI instructions.

If the CFI instructions describe a frame that cannot be encoded in compact unwind, the method returns UNWIND_ARM_MODE_DWARF which tells the runtime to fallback and unwind using dwarf.

Reimplemented from llvm::MCAsmBackend.

Definition at line 1171 of file ARMAsmBackend.cpp.

References contains(), llvm::MachO::CPU_SUBTYPE_ARM_V7K, llvm::dbgs(), DEBUG_WITH_TYPE, llvm::MCContext::emitCompactUnwindNonCanonical(), llvm::ArrayRef< T >::empty(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), llvm::MCDwarfFrameInfo::Instructions, llvm::MCAsmBackend::isDarwinCanonicalPersonality(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::lookup(), llvm::Offset, llvm::MCCFIInstruction::OpDefCfa, llvm::MCCFIInstruction::OpDefCfaOffset, llvm::MCCFIInstruction::OpDefCfaRegister, llvm::MCCFIInstruction::OpOffset, llvm::MCCFIInstruction::OpRelOffset, llvm::MCDwarfFrameInfo::Personality, Subtype, CU::UNWIND_ARM_FRAME_FIRST_PUSH_R4, CU::UNWIND_ARM_FRAME_FIRST_PUSH_R5, CU::UNWIND_ARM_FRAME_FIRST_PUSH_R6, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R10, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R11, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R12, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R8, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R9, CU::UNWIND_ARM_MODE_DWARF, CU::UNWIND_ARM_MODE_FRAME, and CU::UNWIND_ARM_MODE_FRAME_D.

Member Data Documentation

Subtype

const MachO::CPUSubTypeARM llvm::ARMAsmBackendDarwin::Subtype

Definition at line 22 of file ARMAsmBackendDarwin.h.

Referenced by ARMAsmBackendDarwin(), createObjectTargetWriter(), and generateCompactUnwindEncoding().

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

• lib/Target/ARM/MCTargetDesc/ARMAsmBackendDarwin.h
• lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp