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

Encode information on a single operation to perform on a byte sequence (e.g., an encoded instruction) which requires assemble- or run- time patching. More...

#include "llvm/MC/MCFixup.h"

Public Member Functions

MCFixupKind getKind () const
 
uint32_t getOffset () const
 
void setOffset (uint32_t Value)
 
const MCExprgetValue () const
 
SMLoc getLoc () const
 

Static Public Member Functions

static MCFixup create (uint32_t Offset, const MCExpr *Value, MCFixupKind Kind, SMLoc Loc=SMLoc())
 
static MCFixup createAddFor (const MCFixup &Fixup)
 Return a fixup corresponding to the add half of a add/sub fixup pair for the given Fixup. More...
 
static MCFixup createSubFor (const MCFixup &Fixup)
 Return a fixup corresponding to the sub half of a add/sub fixup pair for the given Fixup. More...
 
static MCFixupKind getKindForSize (unsigned Size, bool isPCRel)
 Return the generic fixup kind for a value with the given size. More...
 
static MCFixupKind getAddKindForKind (unsigned Kind)
 Return the generic fixup kind for an addition with a given size. More...
 
static MCFixupKind getSubKindForKind (unsigned Kind)
 Return the generic fixup kind for an subtraction with a given size. More...
 

Detailed Description

Encode information on a single operation to perform on a byte sequence (e.g., an encoded instruction) which requires assemble- or run- time patching.

Fixups are used any time the target instruction encoder needs to represent some value in an instruction which is not yet concrete. The encoder will encode the instruction assuming the value is 0, and emit a fixup which communicates to the assembler backend how it should rewrite the encoded value.

During the process of relaxation, the assembler will apply fixups as symbolic values become concrete. When relaxation is complete, any remaining fixups become relocations in the object file (or errors, if the fixup cannot be encoded on the target).

Definition at line 74 of file MCFixup.h.

Member Function Documentation

◆ create()

static MCFixup llvm::MCFixup::create ( uint32_t  Offset,
const MCExpr Value,
MCFixupKind  Kind,
SMLoc  Loc = SMLoc() 
)
inlinestatic

Definition at line 90 of file MCFixup.h.

References assert(), and llvm::MaxTargetFixupKind.

Referenced by llvm::adjustPqBits(), llvm::createBPFbeMCCodeEmitter(), llvm::createPPCMCCodeEmitter(), llvm::createR600MCCodeEmitter(), llvm::createRISCVMCCodeEmitter(), llvm::MCWinCOFFStreamer::EmitCOFFImgRel32(), llvm::MCWinCOFFStreamer::EmitCOFFSecRel32(), llvm::MCWinCOFFStreamer::EmitCOFFSectionIndex(), llvm::MCObjectStreamer::EmitDTPRel32Value(), llvm::MCObjectStreamer::EmitDTPRel64Value(), llvm::MCObjectStreamer::EmitGPRel32Value(), llvm::MCObjectStreamer::EmitGPRel64Value(), llvm::MCObjectStreamer::EmitRelocDirective(), llvm::MCObjectStreamer::EmitTPRel32Value(), llvm::MCObjectStreamer::EmitTPRel64Value(), llvm::MCObjectStreamer::EmitValueImpl(), llvm::CodeViewContext::encodeDefRange(), llvm::MCAssembler::Finish(), llvm::FixupKind(), GetAEABIUnwindPersonalityName(), llvm::MipsMCCodeEmitter::getBranchTarget21OpValue(), llvm::MipsMCCodeEmitter::getBranchTarget21OpValueMM(), llvm::MipsMCCodeEmitter::getBranchTarget26OpValue(), llvm::MipsMCCodeEmitter::getBranchTarget26OpValueMM(), llvm::MipsMCCodeEmitter::getBranchTarget7OpValueMM(), llvm::MipsMCCodeEmitter::getBranchTargetOpValue(), getBranchTargetOpValue(), llvm::MipsMCCodeEmitter::getBranchTargetOpValue1SImm16(), llvm::MipsMCCodeEmitter::getBranchTargetOpValueLsl2MMR6(), llvm::MipsMCCodeEmitter::getBranchTargetOpValueMM(), llvm::MipsMCCodeEmitter::getBranchTargetOpValueMMPC10(), llvm::MipsMCCodeEmitter::getBranchTargetOpValueMMR6(), llvm::MipsMCCodeEmitter::getExprOpValue(), llvm::MipsMCCodeEmitter::getJumpTargetOpValue(), llvm::MipsMCCodeEmitter::getJumpTargetOpValueMM(), getLit64Encoding(), llvm::MipsMCCodeEmitter::getSimm18Lsl3Encoding(), llvm::MipsMCCodeEmitter::getSimm19Lsl2Encoding(), HasConditionalBranch(), HasSecRelSymbolRef(), isPCRel(), and needsPCRel().

◆ createAddFor()

static MCFixup llvm::MCFixup::createAddFor ( const MCFixup Fixup)
inlinestatic

Return a fixup corresponding to the add half of a add/sub fixup pair for the given Fixup.

Definition at line 103 of file MCFixup.h.

References getAddKindForKind(), getKind(), getLoc(), getOffset(), and getValue().

◆ createSubFor()

static MCFixup llvm::MCFixup::createSubFor ( const MCFixup Fixup)
inlinestatic

Return a fixup corresponding to the sub half of a add/sub fixup pair for the given Fixup.

Definition at line 114 of file MCFixup.h.

References getKind(), getLoc(), getOffset(), getSubKindForKind(), and getValue().

◆ getAddKindForKind()

static MCFixupKind llvm::MCFixup::getAddKindForKind ( unsigned  Kind)
inlinestatic

Return the generic fixup kind for an addition with a given size.

It is an error to pass an unsupported size.

Definition at line 144 of file MCFixup.h.

References llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, llvm::FK_Data_Add_1, llvm::FK_Data_Add_2, llvm::FK_Data_Add_4, llvm::FK_Data_Add_8, and llvm_unreachable.

Referenced by createAddFor().

◆ getKind()

MCFixupKind llvm::MCFixup::getKind ( ) const
inline

◆ getKindForSize()

static MCFixupKind llvm::MCFixup::getKindForSize ( unsigned  Size,
bool  isPCRel 
)
inlinestatic

Return the generic fixup kind for a value with the given size.

It is an error to pass an unsupported size.

Definition at line 132 of file MCFixup.h.

References llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, llvm::FK_PCRel_1, llvm::FK_PCRel_2, llvm::FK_PCRel_4, llvm::FK_PCRel_8, and llvm_unreachable.

Referenced by llvm::MCObjectStreamer::EmitValueImpl(), llvm::MCAssembler::Finish(), GetAEABIUnwindPersonalityName(), getImmFixupKind(), and isInSymtab().

◆ getLoc()

SMLoc llvm::MCFixup::getLoc ( ) const
inline

◆ getOffset()

uint32_t llvm::MCFixup::getOffset ( ) const
inline

◆ getSubKindForKind()

static MCFixupKind llvm::MCFixup::getSubKindForKind ( unsigned  Kind)
inlinestatic

Return the generic fixup kind for an subtraction with a given size.

It is an error to pass an unsupported size.

Definition at line 156 of file MCFixup.h.

References llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_Data_8, llvm::FK_Data_Sub_1, llvm::FK_Data_Sub_2, llvm::FK_Data_Sub_4, llvm::FK_Data_Sub_8, and llvm_unreachable.

Referenced by createSubFor().

◆ getValue()

const MCExpr* llvm::MCFixup::getValue ( ) const
inline

◆ setOffset()

void llvm::MCFixup::setOffset ( uint32_t  Value)
inline

Definition at line 126 of file MCFixup.h.


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