LLVM  6.0.0svn
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llvm::AVRAsmBackend Class Reference

Utilities for manipulating generated AVR machine code. More...

#include "Target/AVR/MCTargetDesc/AVRAsmBackend.h"

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Public Member Functions

 AVRAsmBackend (Triple::OSType OSType)
 
void adjustFixupValue (const MCFixup &Fixup, const MCValue &Target, uint64_t &Value, MCContext *Ctx=nullptr) const
 
std::unique_ptr< MCObjectWritercreateObjectWriter (raw_pwrite_stream &OS) const override
 Create a new MCObjectWriter instance for use by the assembler backend to emit the final object file. More...
 
void applyFixup (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef< char > Data, uint64_t Value, bool IsPCRel) 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...
 
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
 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
 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 (uint64_t Count, MCObjectWriter *OW) const override
 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...
 
- Public Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (const MCAsmBackend &)=delete
 
MCAsmBackendoperator= (const MCAsmBackend &)=delete
 
virtual ~MCAsmBackend ()
 
virtual void reset ()
 lifetime management 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 Optional< MCFixupKindgetFixupKind (StringRef Name) const
 Map a relocation name used in .reloc to a fixup kind. More...
 
virtual bool fixupNeedsRelaxationAdvanced (const MCFixup &Fixup, bool Resolved, uint64_t Value, const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const
 Target specific predicate for whether a given fixup requires the associated instruction to be relaxed. More...
 

Additional Inherited Members

- Protected Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend ()
 

Detailed Description

Utilities for manipulating generated AVR machine code.

Definition at line 32 of file AVRAsmBackend.h.

Constructor & Destructor Documentation

◆ AVRAsmBackend()

llvm::AVRAsmBackend::AVRAsmBackend ( Triple::OSType  OSType)
inline

Member Function Documentation

◆ adjustFixupValue()

void llvm::AVRAsmBackend::adjustFixupValue ( const MCFixup Fixup,
const MCValue Target,
uint64_t &  Value,
MCContext Ctx = nullptr 
) const

◆ applyFixup()

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

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.

Errors (such as an out of range fixup value) should be reported via Ctx.

Implements llvm::MCAsmBackend.

Definition at line 349 of file AVRAsmBackend.cpp.

References adjustFixupValue(), assert(), llvm::MCAssembler::getContext(), llvm::MCFixup::getKind(), llvm::MCFixup::getOffset(), llvm::ArrayRef< T >::size(), llvm::MCFixupKindInfo::TargetOffset, and llvm::MCFixupKindInfo::TargetSize.

Referenced by AVRAsmBackend().

◆ createObjectWriter()

std::unique_ptr< MCObjectWriter > llvm::AVRAsmBackend::createObjectWriter ( raw_pwrite_stream OS) const
overridevirtual

Create a new MCObjectWriter instance for use by the assembler backend to emit the final object file.

Implements llvm::MCAsmBackend.

Definition at line 344 of file AVRAsmBackend.cpp.

References llvm::createAVRELFObjectWriter(), and llvm::MCELFObjectTargetWriter::getOSABI().

Referenced by AVRAsmBackend().

◆ fixupNeedsRelaxation()

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

Simple predicate for targets where !Resolved implies requiring relaxation.

Implements llvm::MCAsmBackend.

Definition at line 55 of file AVRAsmBackend.h.

References llvm_unreachable.

◆ getFixupKindInfo()

MCFixupKindInfo const & llvm::AVRAsmBackend::getFixupKindInfo ( MCFixupKind  Kind) const
overridevirtual

◆ getNumFixupKinds()

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

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 49 of file AVRAsmBackend.h.

References llvm::AVR::NumTargetFixupKinds.

◆ mayNeedRelaxation()

bool llvm::AVRAsmBackend::mayNeedRelaxation ( const MCInst Inst) const
inlineoverridevirtual

Check whether the given instruction may need relaxation.

Parameters
Inst- The instruction to test.

Implements llvm::MCAsmBackend.

Definition at line 53 of file AVRAsmBackend.h.

◆ relaxInstruction()

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

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

Parameters
InstThe instruction to relax, which may be the same as the output.
STIthe subtarget information for the associated instruction.
[out]ResOn return, the relaxed instruction.

Implements llvm::MCAsmBackend.

Definition at line 62 of file AVRAsmBackend.h.

References shouldForceRelocation(), and writeNopData().

◆ shouldForceRelocation()

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

Hook to check if a relocation is needed for some target specific reason.

Reimplemented from llvm::MCAsmBackend.

Definition at line 453 of file AVRAsmBackend.cpp.

References adjust::fixup_13_pcrel(), adjust::fixup_7_pcrel(), adjust::fixup_call(), and llvm::MCFixup::getKind().

Referenced by relaxInstruction().

◆ writeNopData()

bool llvm::AVRAsmBackend::writeNopData ( uint64_t  Count,
MCObjectWriter OW 
) 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 443 of file AVRAsmBackend.cpp.

References assert(), and llvm::MCObjectWriter::WriteZeros().

Referenced by relaxInstruction().


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