llvm::MCAsmLayout Class Reference

#include <MCAsmLayout.h>

Public Types
typedef llvm::SmallVectorImpl < MCSectionData * > ::const_iterator	const_iterator
typedef llvm::SmallVectorImpl < MCSectionData * >::iterator	iterator

Public Member Functions
	MCAsmLayout (MCAssembler &_Assembler)
MCAssembler &	getAssembler () const
	Get the assembler object this is a layout for. More...
void	invalidateFragmentsFrom (MCFragment *F)
	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. More...
void	layoutFragment (MCFragment *Fragment)
	Perform layout for a single fragment, assuming that the previous fragment has already been laid out correctly, and the parent section has been initialized. More...
Section Access (in layout order)
llvm::SmallVectorImpl < MCSectionData * > &	getSectionOrder ()
const llvm::SmallVectorImpl < MCSectionData * > &	getSectionOrder () const
Fragment Layout Data
uint64_t	getFragmentOffset (const MCFragment *F) const
	Get the offset of the given fragment inside its containing section. More...
Utility Functions
uint64_t	getSectionAddressSize (const MCSectionData *SD) const
	Get the address space size of the given section, as it effects layout. This may differ from the size reported by. More...
uint64_t	getSectionFileSize (const MCSectionData *SD) const
	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. More...
uint64_t	getSymbolOffset (const MCSymbolData *SD) const
	Get the offset of the given symbol, as computed in the current layout. More...

Detailed 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.

Definition at line 29 of file MCAsmLayout.h.

Member Typedef Documentation

typedef llvm::SmallVectorImpl<MCSectionData*>::const_iterator llvm::MCAsmLayout::const_iterator

Definition at line 31 of file MCAsmLayout.h.

typedef llvm::SmallVectorImpl<MCSectionData*>::iterator llvm::MCAsmLayout::iterator

Definition at line 32 of file MCAsmLayout.h.

Constructor & Destructor Documentation

MCAsmLayout::MCAsmLayout

(

MCAssembler &

_Assembler

)

Definition at line 64 of file MCAssembler.cpp.

References llvm::MCAssembler::begin(), and llvm::MCAssembler::end().

Member Function Documentation

MCAssembler& llvm::MCAsmLayout::getAssembler ( ) const

inline

Get the assembler object this is a layout for.

Definition at line 61 of file MCAsmLayout.h.

Referenced by llvm::MCExpr::EvaluateAsRelocatable(), llvm::PPCMCExpr::EvaluateAsRelocatableImpl(), getSectionAddressSize(), llvm::MachObjectWriter::getSymbolAddress(), layoutFragment(), and llvm::MachObjectWriter::WriteObject().

uint64_t MCAsmLayout::getFragmentOffset

(

const MCFragment *

F

)

const

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

Definition at line 113 of file MCAssembler.cpp.

Referenced by llvm::MCAssembler::computeFragmentSize(), getFixupOffset(), llvm::MachObjectWriter::getFragmentAddress(), getSectionAddressSize(), and getSymbolOffset().

uint64_t MCAsmLayout::getSectionAddressSize

(

const MCSectionData *

SD

)

const

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

See Also

getSectionSize() by not including section tail padding.

Definition at line 151 of file MCAssembler.cpp.

References llvm::iplist< NodeTy, Traits >::back(), llvm::MCAssembler::computeFragmentSize(), getAssembler(), llvm::MCSectionData::getFragmentList(), and getFragmentOffset().

Referenced by llvm::MachObjectWriter::computeSectionAddresses(), llvm::MachObjectWriter::getPaddingSize(), getSectionFileSize(), llvm::MachObjectWriter::WriteObject(), llvm::MachObjectWriter::WriteSection(), and llvm::MCAssembler::writeSectionData().

uint64_t MCAsmLayout::getSectionFileSize

(

const MCSectionData *

SD

)

const

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.

Definition at line 157 of file MCAssembler.cpp.

References llvm::MCSectionData::getSection(), getSectionAddressSize(), and llvm::MCSection::isVirtualSection().

Referenced by llvm::MachObjectWriter::WriteObject(), llvm::MachObjectWriter::WriteSection(), and llvm::MCAssembler::writeSectionData().

llvm::SmallVectorImpl<MCSectionData*>& llvm::MCAsmLayout::getSectionOrder ( )

inline

Definition at line 76 of file MCAsmLayout.h.

Referenced by llvm::MachObjectWriter::computeSectionAddresses(), and llvm::MachObjectWriter::getPaddingSize().

const llvm::SmallVectorImpl<MCSectionData*>& llvm::MCAsmLayout::getSectionOrder ( ) const

inline

Definition at line 79 of file MCAsmLayout.h.

uint64_t MCAsmLayout::getSymbolOffset

(

const MCSymbolData *

SD

)

const

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

Definition at line 119 of file MCAssembler.cpp.

References llvm::MCExpr::EvaluateAsRelocatable(), llvm::MCValue::getConstant(), llvm::MCSymbolData::getFragment(), getFragmentOffset(), llvm::MCSymbol::getName(), llvm::MCSymbolData::getOffset(), llvm::MCValue::getSymA(), llvm::MCValue::getSymB(), llvm::MCSymbolRefExpr::getSymbol(), llvm::MCSymbolData::getSymbol(), llvm::MCAssembler::getSymbolData(), llvm::MCSymbol::getVariableValue(), llvm::MCSymbol::isUndefined(), llvm::MCSymbol::isVariable(), and llvm::report_fatal_error().

Referenced by llvm::MachObjectWriter::getSymbolAddress().

void MCAsmLayout::invalidateFragmentsFrom

(

MCFragment *

F

)

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.

Definition at line 85 of file MCAssembler.cpp.

References llvm::MCFragment::getParent(), and llvm::ilist_node< NodeTy >::getPrevNode().

void MCAsmLayout::layoutFragment

(

MCFragment *

Fragment

)

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

Definition at line 477 of file MCAssembler.cpp.

References llvm::MCAssembler::computeFragmentSize(), F(), getAssembler(), llvm::MCAssembler::getBundleAlignSize(), llvm::MCFragment::getParent(), llvm::ilist_node< NodeTy >::getPrevNode(), llvm::MCFragment::hasInstructions(), llvm::MCAssembler::isBundlingEnabled(), llvm::report_fatal_error(), and llvm::MCFragment::setBundlePadding().

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

• MCAsmLayout.h
• MCAssembler.cpp