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

#include "Target/Mips/MCTargetDesc/MipsAsmBackend.h"

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Public Member Functions

 MipsAsmBackend (const Target &T, const MCRegisterInfo &MRI, const Triple &TT, StringRef CPU, bool N32)
 
std::unique_ptr< MCObjectTargetWritercreateObjectTargetWriter () const override
 
void applyFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef< char > Data, uint64_t Value, bool IsResolved, const MCSubtargetInfo *STI) const override
 ApplyFixup - 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...
 
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...
 
unsigned getNumFixupKinds () const override
 Get the number of target specific fixup kinds. More...
 
bool writeNopData (raw_ostream &OS, uint64_t Count) const override
 WriteNopData - Write an (optimal) nop sequence of Count bytes to the given output. 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...
 
bool isMicroMips (const MCSymbol *Sym) const override
 Check whether a given symbol has been flagged with MICROMIPS flag. More...
 
Target Relaxation Interfaces
bool mayNeedRelaxation (const MCInst &Inst, const MCSubtargetInfo &STI) const override
 MayNeedRelaxation - Check whether the given instruction may need relaxation. More...
 
bool fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const override
 fixupNeedsRelaxation - Target specific predicate for whether a given fixup requires the associated instruction to be relaxed. More...
 
void relaxInstruction (const MCInst &Inst, const MCSubtargetInfo &STI, MCInst &Res) const override
 RelaxInstruction - Relax the instruction in the given fragment to the next wider instruction. More...
 
- 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 void handleAssemblerFlag (MCAssemblerFlag Flag)
 Handle any target-specific assembler flags. By default, do nothing. More...
 
virtual uint32_t generateCompactUnwindEncoding (ArrayRef< MCCFIInstruction >) const
 Generate the compact unwind encoding for the CFI instructions. 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...
 

Additional Inherited Members

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

Detailed Description

Definition at line 30 of file MipsAsmBackend.h.

Constructor & Destructor Documentation

◆ MipsAsmBackend()

llvm::MipsAsmBackend::MipsAsmBackend ( const Target T,
const MCRegisterInfo MRI,
const Triple TT,
StringRef  CPU,
bool  N32 
)
inline

Member Function Documentation

◆ applyFixup()

void MipsAsmBackend::applyFixup ( const MCAssembler Asm,
const MCFixup Fixup,
const MCValue Target,
MutableArrayRef< char Data,
uint64_t  Value,
bool  IsResolved,
const MCSubtargetInfo STI 
) const
overridevirtual

◆ createObjectTargetWriter()

std::unique_ptr< MCObjectTargetWriter > MipsAsmBackend::createObjectTargetWriter ( ) const
overridevirtual

Implements llvm::MCAsmBackend.

Definition at line 219 of file MipsAsmBackend.cpp.

References llvm::createMipsELFObjectWriter().

Referenced by MipsAsmBackend().

◆ fixupNeedsRelaxation()

bool llvm::MipsAsmBackend::fixupNeedsRelaxation ( const MCFixup Fixup,
uint64_t  Value,
const MCRelaxableFragment DF,
const MCAsmLayout Layout 
) const
inlineoverridevirtual

fixupNeedsRelaxation - Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.

Implements llvm::MCAsmBackend.

Definition at line 69 of file MipsAsmBackend.h.

References llvm_unreachable.

◆ getFixupKind()

Optional< MCFixupKind > MipsAsmBackend::getFixupKind ( StringRef  Name) const
overridevirtual

◆ getFixupKindInfo()

const MCFixupKindInfo & MipsAsmBackend::getFixupKindInfo ( MCFixupKind  Kind) const
overridevirtual

◆ getNumFixupKinds()

unsigned llvm::MipsAsmBackend::getNumFixupKinds ( ) const
inlineoverridevirtual

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 51 of file MipsAsmBackend.h.

References llvm::Mips::NumTargetFixupKinds.

Referenced by getFixupKindInfo().

◆ isMicroMips()

bool MipsAsmBackend::isMicroMips ( const MCSymbol Sym) const
overridevirtual

Check whether a given symbol has been flagged with MICROMIPS flag.

Reimplemented from llvm::MCAsmBackend.

Definition at line 576 of file MipsAsmBackend.cpp.

References llvm::ELF::STO_MIPS_MICROMIPS.

Referenced by relaxInstruction().

◆ mayNeedRelaxation()

bool llvm::MipsAsmBackend::mayNeedRelaxation ( const MCInst Inst,
const MCSubtargetInfo STI 
) const
inlineoverridevirtual

MayNeedRelaxation - Check whether the given instruction may need relaxation.

Parameters
Inst- The instruction to test.

Implements llvm::MCAsmBackend.

Definition at line 62 of file MipsAsmBackend.h.

◆ relaxInstruction()

void llvm::MipsAsmBackend::relaxInstruction ( const MCInst Inst,
const MCSubtargetInfo STI,
MCInst Res 
) const
inlineoverridevirtual

RelaxInstruction - Relax the instruction in the given fragment to the next wider instruction.

Parameters
Inst- The instruction to relax, which may be the same as the output.
[out]ResOn return, the relaxed instruction.

Implements llvm::MCAsmBackend.

Definition at line 83 of file MipsAsmBackend.h.

References isMicroMips(), shouldForceRelocation(), and writeNopData().

◆ shouldForceRelocation()

bool MipsAsmBackend::shouldForceRelocation ( const MCAssembler Asm,
const MCFixup Fixup,
const MCValue Target 
)
overridevirtual

◆ writeNopData()

bool MipsAsmBackend::writeNopData ( raw_ostream OS,
uint64_t  Count 
) const
overridevirtual

WriteNopData - 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.

Returns
- True on success.

Implements llvm::MCAsmBackend.

Definition at line 521 of file MipsAsmBackend.cpp.

References llvm::raw_ostream::write_zeros().

Referenced by relaxInstruction().


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