class MCAsmLayout

Declaration

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

Description

Encapsulates the layout of an assembly file at a particular point in time. Assembly may require computing multiple layouts for a particular assembly file as part of the relaxation process. This class encapsulates the layout at a single point in time in such a way that it is always possible to efficiently compute the exact address of any symbol in the assembly file, even during the relaxation process.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:28

Member Variables

private llvm::MCAssembler& Assembler
private llvm::SmallVector<MCSection*, 16> SectionOrder
List of sections in layout order.
private DenseMap<const llvm::MCSection*, llvm::MCFragment*> LastValidFragment
The last fragment which was laid out, or 0 if nothing has been laid out. Fragments are always laid out in order, so all fragments with a lower ordinal will be valid.

Method Overview

Methods

MCAsmLayout(llvm::MCAssembler& Assembler)

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:47

Parameters

llvm::MCAssembler& Assembler

bool canGetFragmentOffset(
    const llvm::MCFragment* F) const

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:54

Parameters

const llvm::MCFragment* F

Returns

whether the offset of fragment \p F can be obtained via getFragmentOffset.

void ensureValid(const llvm::MCFragment* F) const

Description

Make sure that the layout for the given fragment is valid, lazily computing it if necessary.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:41

Parameters

const llvm::MCFragment* F

llvm::MCAssembler& getAssembler() const

Description

Get the assembler object this is a layout for.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:50

const llvm::MCSymbol* getBaseSymbol(
    const llvm::MCSymbol& Symbol) const

Description

If this symbol is equivalent to A + Constant, return A.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:103

Parameters

const llvm::MCSymbol& Symbol

uint64_t getFragmentOffset(
    const llvm::MCFragment* F) const

Description

Get the offset of the given fragment inside its containing section.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:79

Parameters

const llvm::MCFragment* F

uint64_t getSectionAddressSize(
    const llvm::MCSection* Sec) const

Description

Get the address space size of the given section, as it effects layout. This may differ from the size reported by

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:88

Parameters

const llvm::MCSection* Sec

uint64_t getSectionFileSize(
    const llvm::MCSection* Sec) const

Description

Get the data size of the given section, as emitted to the object file. This may include additional padding, or be 0 for virtual sections.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:92

Parameters

const llvm::MCSection* Sec

llvm::SmallVectorImpl<MCSection*>&
getSectionOrder()

Description

@ {

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:69

const llvm::SmallVectorImpl<MCSection*>&
getSectionOrder() const

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:70

bool getSymbolOffset(const llvm::MCSymbol& S,
                     uint64_t& Val) const

Description

Get the offset of the given symbol, as computed in the current layout.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:97

Parameters

const llvm::MCSymbol& S
uint64_t& Val

Returns

True on success.

uint64_t getSymbolOffset(
    const llvm::MCSymbol& S) const

Description

Variant that reports a fatal error if the offset is not computable.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:100

Parameters

const llvm::MCSymbol& S

void invalidateFragmentsFrom(llvm::MCFragment* F)

Description

Invalidate the fragments starting with F because it has been resized. The fragment's size should have already been updated, but its bundle padding will be recomputed.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:59

Parameters

llvm::MCFragment* F

bool isFragmentValid(
    const llvm::MCFragment* F) const

Description

Is the layout for this fragment valid?

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:44

Parameters

const llvm::MCFragment* F

void layoutFragment(llvm::MCFragment* Fragment)

Description

Perform layout for a single fragment, assuming that the previous fragment has already been laid out correctly, and the parent section has been initialized.

Declared at: llvm/include/llvm/MC/MCAsmLayout.h:64

Parameters

llvm::MCFragment* Fragment