class MCFixup

Declaration

class MCFixup { /* full declaration omitted */ };

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).

Declared at: llvm/include/llvm/MC/MCFixup.h:77

Method Overview

• public static llvm::MCFixup create(uint32_t Offset, const llvm::MCExpr * Value, llvm::MCFixupKind Kind, llvm::SMLoc Loc = llvm::SMLoc())
• public static llvm::MCFixup createAddFor(const llvm::MCFixup & Fixup)
• public static llvm::MCFixup createSubFor(const llvm::MCFixup & Fixup)
• public static llvm::MCFixupKind getAddKindForKind(llvm::MCFixupKind Kind)
• public llvm::MCFixupKind getKind() const
• public static llvm::MCFixupKind getKindForSize(unsigned int Size, bool IsPCRel)
• public static llvm::MCFixupKind getKindForSizeInBits(unsigned int Size, bool IsPCRel)
• public llvm::SMLoc getLoc() const
• public uint32_t getOffset() const
• public static llvm::MCFixupKind getSubKindForKind(llvm::MCFixupKind Kind)
• public unsigned int getTargetKind() const
• public const llvm::MCExpr * getValue() const
• public void setOffset(uint32_t Value)

Methods

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

Declared at: llvm/include/llvm/MC/MCFixup.h:93

Parameters

uint32_t Offset

const llvm::MCExpr* Value

llvm::MCFixupKind Kind

llvm::SMLoc Loc = llvm::SMLoc()

¶static llvm::MCFixup createAddFor(
    const llvm::MCFixup& Fixup)

Description

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

Declared at: llvm/include/llvm/MC/MCFixup.h:106

Parameters

const llvm::MCFixup& Fixup

¶static llvm::MCFixup createSubFor(
    const llvm::MCFixup& Fixup)

Description

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

Declared at: llvm/include/llvm/MC/MCFixup.h:117

Parameters

const llvm::MCFixup& Fixup

¶static llvm::MCFixupKind getAddKindForKind(
    llvm::MCFixupKind Kind)

Description

Return the generic fixup kind for an addition with a given size. It is an error to pass an unsupported size.

Declared at: llvm/include/llvm/MC/MCFixup.h:173

Parameters

llvm::MCFixupKind Kind

¶llvm::MCFixupKind getKind() const

Declared at: llvm/include/llvm/MC/MCFixup.h:126

¶static llvm::MCFixupKind getKindForSize(
    unsigned int Size,
    bool IsPCRel)

Description

Return the generic fixup kind for a value with the given size. It is an error to pass an unsupported size.

Declared at: llvm/include/llvm/MC/MCFixup.h:137

Parameters

unsigned int Size

bool IsPCRel

¶static llvm::MCFixupKind getKindForSizeInBits(
    unsigned int Size,
    bool IsPCRel)

Description

Return the generic fixup kind for a value with the given size in bits. It is an error to pass an unsupported size.

Declared at: llvm/include/llvm/MC/MCFixup.h:153

Parameters

unsigned int Size

bool IsPCRel

¶llvm::SMLoc getLoc() const

Declared at: llvm/include/llvm/MC/MCFixup.h:197

¶uint32_t getOffset() const

Declared at: llvm/include/llvm/MC/MCFixup.h:130

¶static llvm::MCFixupKind getSubKindForKind(
    llvm::MCFixupKind Kind)

Description

Return the generic fixup kind for an subtraction with a given size. It is an error to pass an unsupported size.

Declared at: llvm/include/llvm/MC/MCFixup.h:186

Parameters

llvm::MCFixupKind Kind

¶unsigned int getTargetKind() const

Declared at: llvm/include/llvm/MC/MCFixup.h:128

¶const llvm::MCExpr* getValue() const

Declared at: llvm/include/llvm/MC/MCFixup.h:133

¶void setOffset(uint32_t Value)

Declared at: llvm/include/llvm/MC/MCFixup.h:131

Parameters

uint32_t Value