LLVM  14.0.0git
Public Member Functions | Public Attributes | List of all members
llvm::ARMAsmBackendDarwin Class Reference

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

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Public Member Functions

 ARMAsmBackendDarwin (const Target &T, const MCSubtargetInfo &STI, const MCRegisterInfo &MRI)
 
std::unique_ptr< MCObjectTargetWritercreateObjectTargetWriter () const override
 
uint32_t generateCompactUnwindEncoding (ArrayRef< MCCFIInstruction > Instrs) const override
 Generate compact unwind encoding for the function based on the CFI instructions. More...
 
- Public Member Functions inherited from llvm::ARMAsmBackend
 ARMAsmBackend (const Target &T, bool isThumb, support::endianness Endian)
 
unsigned getNumFixupKinds () const override
 Get the number of target specific fixup kinds. More...
 
bool hasNOP (const MCSubtargetInfo *STI) const
 
Optional< MCFixupKindgetFixupKind (StringRef Name) const override
 Map a relocation name used in .reloc to a fixup kind. More...
 
const MCFixupKindInfogetFixupKindInfo (MCFixupKind Kind) const override
 Get information on a fixup kind. More...
 
bool shouldForceRelocation (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target) override
 Hook to check if a relocation is needed for some target specific reason. More...
 
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. More...
 
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. More...
 
const char * reasonForFixupRelaxation (const MCFixup &Fixup, uint64_t Value) const
 
bool fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const override
 Simple predicate for targets where !Resolved implies requiring relaxation. More...
 
void relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const override
 Relax the instruction in the given fragment to the next wider instruction. More...
 
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. More...
 
void handleAssemblerFlag (MCAssemblerFlag Flag) override
 Handle any target-specific assembler flags. By default, do nothing. More...
 
unsigned getPointerSize () const
 
bool isThumb () const
 
void setIsThumb (bool it)
 
- Public Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (const MCAsmBackend &)=delete
 
MCAsmBackendoperator= (const MCAsmBackend &)=delete
 
virtual ~MCAsmBackend ()
 
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. More...
 
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. More...
 
virtual void emitInstructionBegin (MCObjectStreamer &OS, const MCInst &Inst, const MCSubtargetInfo &STI)
 Give the target a chance to manipulate state related to instruction alignment (e.g. More...
 
virtual void emitInstructionEnd (MCObjectStreamer &OS, const MCInst &Inst)
 
virtual void reset ()
 lifetime management More...
 
std::unique_ptr< MCObjectWritercreateObjectWriter (raw_pwrite_stream &OS) const
 Create a new MCObjectWriter instance for use by the assembler backend to emit the final object file. More...
 
std::unique_ptr< MCObjectWritercreateDwoObjectWriter (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. More...
 
virtual unsigned getMinimumNopSize () const
 Returns the minimum size of a nop in bytes on this target. More...
 
virtual unsigned getMaximumNopSize (const MCSubtargetInfo &STI) const
 Returns the maximum size of a nop in bytes on this target. More...
 
virtual void finishLayout (MCAssembler const &Asm, MCAsmLayout &Layout) const
 Give backend an opportunity to finish layout after relaxation. More...
 
virtual bool isMicroMips (const MCSymbol *Sym) const
 Check whether a given symbol has been flagged with MICROMIPS flag. More...
 
virtual bool shouldInsertExtraNopBytesForCodeAlign (const MCAlignFragment &AF, unsigned &Size)
 Hook to check if extra nop bytes must be inserted for alignment directive. More...
 
virtual bool shouldInsertFixupForCodeAlign (MCAssembler &Asm, const MCAsmLayout &Layout, MCAlignFragment &AF)
 Hook which indicates if the target requires a fixup to be generated when handling an align directive in an executable section. More...
 
virtual bool evaluateTargetFixup (const MCAssembler &Asm, const MCAsmLayout &Layout, const MCFixup &Fixup, const MCFragment *DF, const MCValue &Target, uint64_t &Value, bool &WasForced)
 
virtual bool fixupNeedsRelaxationAdvanced (const MCFixup &Fixup, bool Resolved, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout, const bool WasForced) const
 Target specific predicate for whether a given fixup requires the associated instruction to be relaxed. More...
 
virtual bool relaxDwarfLineAddr (MCDwarfLineAddrFragment &DF, MCAsmLayout &Layout, bool &WasRelaxed) const
 
virtual bool relaxDwarfCFA (MCDwarfCallFrameFragment &DF, MCAsmLayout &Layout, bool &WasRelaxed) const
 

Public Attributes

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

Additional Inherited Members

- Protected Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (support::endianness Endian)
 

Detailed Description

Definition at line 17 of file ARMAsmBackendDarwin.h.

Constructor & Destructor Documentation

◆ ARMAsmBackendDarwin()

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

Definition at line 22 of file ARMAsmBackendDarwin.h.

References MRI, and T.

Member Function Documentation

◆ createObjectTargetWriter()

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

◆ generateCompactUnwindEncoding()

uint32_t ARMAsmBackendDarwin::generateCompactUnwindEncoding ( ArrayRef< MCCFIInstruction Instrs) 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 1110 of file ARMAsmBackend.cpp.

References contains(), llvm::MachO::CPU_SUBTYPE_ARM_V7K, llvm::dbgs(), DEBUG_WITH_TYPE, llvm::numbers::e, llvm::ArrayRef< T >::empty(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), llvm::MCRegisterInfo::getLLVMRegNum(), llvm::MCRegisterInfo::getName(), llvm::MCCFIInstruction::getOffset(), llvm::MCCFIInstruction::getOperation(), llvm::MCCFIInstruction::getRegister(), i, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::lookup(), Offset, llvm::MCCFIInstruction::OpDefCfa, llvm::MCCFIInstruction::OpDefCfaOffset, llvm::MCCFIInstruction::OpDefCfaRegister, llvm::MCCFIInstruction::OpOffset, llvm::MCCFIInstruction::OpRelOffset, R4, R6, Reg, llvm::ArrayRef< T >::size(), 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, CU::UNWIND_ARM_MODE_FRAME_D, and CU::UNWIND_ARM_MODE_MASK.

Member Data Documentation

◆ Subtype

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

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