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//===- MCAsmLayout.h - Assembly Layout Object -------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCASMLAYOUT_H
#define LLVM_MC_MCASMLAYOUT_H
namespace llvm {
class MCAssembler;
class MCFragment;
class MCSectionData;
class MCSymbolData;
/// Encapsulates the layout of an assembly file at a particular point in time.
///
/// Assembly may requiring compute 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 addresses of any symbol in the assembly file,
/// even during the relaxation process.
class MCAsmLayout {
private:
MCAssembler &Assembler;
public:
MCAsmLayout(MCAssembler &_Assembler) : Assembler(_Assembler) {}
/// Get the assembler object this is a layout for.
MCAssembler &getAssembler() const { return Assembler; }
/// \brief Update the layout because a fragment has been resized. The
/// fragments size should have already been updated, the \arg SlideAmount is
/// the delta from the old size.
void UpdateForSlide(MCFragment *F, int SlideAmount);
/// @name Fragment Layout Data
/// @{
/// \brief Get the effective size of the given fragment, as computed in the
/// current layout.
uint64_t getFragmentEffectiveSize(const MCFragment *F) const;
/// \brief Set the effective size of the given fragment.
void setFragmentEffectiveSize(MCFragment *F, uint64_t Value);
/// \brief Get the offset of the given fragment inside its containing section.
uint64_t getFragmentOffset(const MCFragment *F) const;
/// \brief Set the offset of the given fragment inside its containing section.
void setFragmentOffset(MCFragment *F, uint64_t Value);
/// @}
/// @name Section Layout Data
/// @{
/// \brief Get the computed address of the given section.
uint64_t getSectionAddress(const MCSectionData *SD) const;
/// \brief Set the computed address of the given section.
void setSectionAddress(MCSectionData *SD, uint64_t Value);
/// \brief 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.
uint64_t getSectionFileSize(const MCSectionData *SD) const;
/// \brief Set the data size of the given section.
void setSectionFileSize(MCSectionData *SD, uint64_t Value);
/// \brief Get the actual data size of the given section.
uint64_t getSectionSize(const MCSectionData *SD) const;
/// \brief Set the actual data size of the given section.
void setSectionSize(MCSectionData *SD, uint64_t Value);
/// @}
/// @name Utility Functions
/// @{
/// \brief Get the address of the given fragment, as computed in the current
/// layout.
uint64_t getFragmentAddress(const MCFragment *F) const;
/// \brief Get the address of the given symbol, as computed in the current
/// layout.
uint64_t getSymbolAddress(const MCSymbolData *SD) const;
/// @}
};
} // end namespace llvm
#endif
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