LLVM  10.0.0svn
Public Member Functions | Public Attributes | List of all members
llvm::ARMAsmBackendDarwin Class Reference

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

Inheritance diagram for llvm::ARMAsmBackendDarwin:
Inheritance graph
Collaboration diagram for llvm::ARMAsmBackendDarwin:
Collaboration graph

Public Member Functions

 ARMAsmBackendDarwin (const Target &T, const MCSubtargetInfo &STI, const MCRegisterInfo &MRI, MachO::CPUSubTypeARM st)
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, const MCSubtargetInfo &STI, support::endianness Endian)
unsigned getNumFixupKinds () const override
 Get the number of target specific fixup kinds. More...
bool hasNOP () 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 charreasonForFixupRelaxation (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 (const MCInst &Inst, const MCSubtargetInfo &STI, MCInst &Res) const override
 Relax the instruction in the given fragment to the next wider instruction. More...
bool writeNopData (raw_ostream &OS, uint64_t Count) 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 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 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...
void handleCodePaddingBasicBlockStart (MCObjectStreamer *OS, const MCCodePaddingContext &Context)
 Handles all target related code padding when starting to write a new basic block to an object file. More...
void handleCodePaddingBasicBlockEnd (const MCCodePaddingContext &Context)
 Handles all target related code padding after writing a block to an object file. More...
void handleCodePaddingInstructionBegin (const MCInst &Inst)
 Handles all target related code padding before writing a new instruction to an object file. More...
void handleCodePaddingInstructionEnd (const MCInst &Inst)
 Handles all target related code padding after writing an instruction to an object file. More...
bool relaxFragment (MCPaddingFragment *PF, MCAsmLayout &Layout)
 Relaxes a fragment (changes the size of the padding) according to target requirements. 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 requiresDiffExpressionRelocations () const
 Check whether the given target requires emitting differences of two symbols as a set of relocations. More...
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...

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,
MachO::CPUSubTypeARM  st 

Definition at line 21 of file ARMAsmBackendDarwin.h.

Member Function Documentation

◆ createObjectTargetWriter()

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

◆ generateCompactUnwindEncoding()

uint32_t ARMAsmBackendDarwin::generateCompactUnwindEncoding ( ArrayRef< MCCFIInstruction Instrs) const

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 1098 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::MCCFIInstruction::getOffset(), llvm::MCCFIInstruction::getOperation(), llvm::MCCFIInstruction::getRegister(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::lookup(), MRI, llvm::MCCFIInstruction::OpDefCfa, llvm::MCCFIInstruction::OpDefCfaOffset, llvm::MCCFIInstruction::OpDefCfaRegister, llvm::MCCFIInstruction::OpOffset, llvm::MCCFIInstruction::OpRelOffset, R4, R6, Reg, llvm::ArrayRef< T >::size(), 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.

Referenced by createObjectTargetWriter().

Member Data Documentation

◆ Subtype

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

Definition at line 20 of file ARMAsmBackendDarwin.h.

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