LLVM  4.0.0
Public Member Functions | List of all members
llvm::AVRAsmBackend Class Reference

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

#include <AVRAsmBackend.h>

Inheritance diagram for llvm::AVRAsmBackend:
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Collaboration diagram for llvm::AVRAsmBackend:
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Public Member Functions

 AVRAsmBackend (Triple::OSType OSType)
 
void adjustFixupValue (const MCFixup &Fixup, uint64_t &Value, MCContext *Ctx=nullptr) const
 
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 MCFixup &Fixup, char *Data, unsigned DataSize, 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...
 
void processFixupValue (const MCAssembler &Asm, const MCAsmLayout &Layout, const MCFixup &Fixup, const MCFragment *DF, const MCValue &Target, uint64_t &Value, bool &IsResolved) override
 Target hook to adjust the literal value of a fixup if necessary. More...
 
- Public Member Functions inherited from llvm::MCAsmBackend
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

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

Definition at line 35 of file AVRAsmBackend.h.

Member Function Documentation

void llvm::AVRAsmBackend::adjustFixupValue ( const MCFixup Fixup,
uint64_t &  Value,
MCContext Ctx = nullptr 
) const
void llvm::AVRAsmBackend::applyFixup ( const MCFixup Fixup,
char *  Data,
unsigned  DataSize,
uint64_t  Value,
bool  IsPCRel 
) 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.

Implements llvm::MCAsmBackend.

Definition at line 336 of file AVRAsmBackend.cpp.

References assert(), getFixupKindInfo(), llvm::MCFixup::getKind(), llvm::MCFixup::getOffset(), i, Offset, llvm::MCFixupKindInfo::TargetOffset, and llvm::MCFixupKindInfo::TargetSize.

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 331 of file AVRAsmBackend.cpp.

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

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 54 of file AVRAsmBackend.h.

References llvm_unreachable.

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

Get the number of target specific fixup kinds.

Implements llvm::MCAsmBackend.

Definition at line 48 of file AVRAsmBackend.h.

References llvm::AVR::NumTargetFixupKinds.

Referenced by getFixupKindInfo().

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 52 of file AVRAsmBackend.h.

void llvm::AVRAsmBackend::processFixupValue ( const MCAssembler Asm,
const MCAsmLayout Layout,
const MCFixup Fixup,
const MCFragment DF,
const MCValue Target,
uint64_t &  Value,
bool IsResolved 
)
overridevirtual

Target hook to adjust the literal value of a fixup if necessary.

IsResolved signals whether the caller believes a relocation is needed; the target can modify the value. The default does nothing.

Reimplemented from llvm::MCAsmBackend.

Definition at line 439 of file AVRAsmBackend.cpp.

References adjustFixupValue(), llvm::AVR::fixup_13_pcrel, llvm::AVR::fixup_7_pcrel, llvm::AVR::fixup_call, llvm::MCAssembler::getContext(), llvm::MCFixup::getKind(), llvm::MCValue::getSymA(), llvm::MCSymbolRefExpr::getSymbol(), and llvm::MCSymbol::isTemporary().

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 61 of file AVRAsmBackend.h.

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 429 of file AVRAsmBackend.cpp.

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


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