LLVM  8.0.0svn
Public Member Functions | List of all members
llvm::Nios2AsmBackend Class Reference

#include "Target/Nios2/MCTargetDesc/Nios2AsmBackend.h"

Inheritance diagram for llvm::Nios2AsmBackend:
Inheritance graph
[legend]
Collaboration diagram for llvm::Nios2AsmBackend:
Collaboration graph
[legend]

Public Member Functions

 Nios2AsmBackend (const Target &T, Triple::OSType OSType)
 
std::unique_ptr< MCObjectTargetWritercreateObjectTargetWriter () const override
 
bool writeNopData (raw_ostream &OS, uint64_t Count) const override
 Write an (optimal) nop sequence of Count bytes to the given output. More...
 
void applyFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef< char > Data, uint64_t Value, bool IsResolved) 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 mayNeedRelaxation (const MCInst &Inst) 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...
 
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 shouldForceRelocation (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target)
 Hook to check if a relocation is needed for some target specific reason. More...
 
virtual void applyFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef< char > Data, uint64_t Value, bool IsResolved, const MCSubtargetInfo *STI) const =0
 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...
 
virtual bool requiresDiffExpressionRelocations () const
 Check whether the given target requires emitting differences of two symbols as a set of relocations. More...
 
virtual bool mayNeedRelaxation (const MCInst &Inst, const MCSubtargetInfo &STI) const =0
 Check whether the given instruction may need relaxation. 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 29 of file Nios2AsmBackend.h.

Constructor & Destructor Documentation

◆ Nios2AsmBackend()

llvm::Nios2AsmBackend::Nios2AsmBackend ( const Target T,
Triple::OSType  OSType 
)
inline

Member Function Documentation

◆ applyFixup()

void Nios2AsmBackend::applyFixup ( const MCAssembler Asm,
const MCFixup Fixup,
const MCValue Target,
MutableArrayRef< char Data,
uint64_t  Value,
bool  IsResolved 
) 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.

Definition at line 56 of file Nios2AsmBackend.cpp.

References adjustFixupValue(), calculateLEIndex(), getFixupKindInfo(), llvm::MCFixup::getKind(), llvm::MCFixup::getOffset(), Kind, llvm::BitmaskEnumDetail::Mask(), and llvm::MCFixupKindInfo::TargetSize.

Referenced by Nios2AsmBackend().

◆ createObjectTargetWriter()

std::unique_ptr< MCObjectTargetWriter > Nios2AsmBackend::createObjectTargetWriter ( ) const
overridevirtual

◆ fixupNeedsRelaxation()

bool llvm::Nios2AsmBackend::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 60 of file Nios2AsmBackend.h.

References llvm_unreachable.

◆ getFixupKind()

Optional< MCFixupKind > Nios2AsmBackend::getFixupKind ( StringRef  Name) const
overridevirtual

Map a relocation name used in .reloc to a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Definition at line 88 of file Nios2AsmBackend.cpp.

References llvm::StringSwitch< T, R >::Default(), llvm::Nios2::fixup_Nios2_32, llvm::FK_Data_4, llvm::MCAsmBackend::getFixupKind(), and Name.

Referenced by Nios2AsmBackend().

◆ getFixupKindInfo()

const MCFixupKindInfo & Nios2AsmBackend::getFixupKindInfo ( MCFixupKind  Kind) const
overridevirtual

Get information on a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Definition at line 97 of file Nios2AsmBackend.cpp.

References assert(), llvm::FirstTargetFixupKind, llvm::MCAsmBackend::getFixupKindInfo(), getNumFixupKinds(), and llvm::Nios2::NumTargetFixupKinds.

Referenced by applyFixup(), and Nios2AsmBackend().

◆ getNumFixupKinds()

unsigned llvm::Nios2AsmBackend::getNumFixupKinds ( ) const
inlineoverridevirtual

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 48 of file Nios2AsmBackend.h.

References llvm::Nios2::NumTargetFixupKinds.

Referenced by getFixupKindInfo().

◆ mayNeedRelaxation()

bool llvm::Nios2AsmBackend::mayNeedRelaxation ( const MCInst Inst) const
inlineoverride

MayNeedRelaxation - Check whether the given instruction may need relaxation.

Parameters
Inst- The instruction to test.

Definition at line 56 of file Nios2AsmBackend.h.

◆ relaxInstruction()

void llvm::Nios2AsmBackend::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 74 of file Nios2AsmBackend.h.

◆ writeNopData()

bool Nios2AsmBackend::writeNopData ( raw_ostream OS,
uint64_t  Count 
) const
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.

Returns
- True on success.

Implements llvm::MCAsmBackend.

Definition at line 120 of file Nios2AsmBackend.cpp.

Referenced by Nios2AsmBackend().


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