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117 lines
3.8 KiB
C++
117 lines
3.8 KiB
C++
//===- MCAsmLayout.h - Assembly Layout Object -------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCASMLAYOUT_H
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#define LLVM_MC_MCASMLAYOUT_H
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#include "llvm/ADT/SmallVector.h"
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namespace llvm {
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class MCAssembler;
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class MCFragment;
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class MCSectionData;
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class MCSymbolData;
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/// Encapsulates the layout of an assembly file at a particular point in time.
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///
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/// Assembly may requiring compute multiple layouts for a particular assembly
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/// file as part of the relaxation process. This class encapsulates the layout
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/// at a single point in time in such a way that it is always possible to
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/// efficiently compute the exact addresses of any symbol in the assembly file,
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/// even during the relaxation process.
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class MCAsmLayout {
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public:
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typedef llvm::SmallVectorImpl<MCSectionData*>::const_iterator const_iterator;
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typedef llvm::SmallVectorImpl<MCSectionData*>::iterator iterator;
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private:
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MCAssembler &Assembler;
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/// List of sections in layout order.
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llvm::SmallVector<MCSectionData*, 16> SectionOrder;
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public:
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MCAsmLayout(MCAssembler &_Assembler);
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/// Get the assembler object this is a layout for.
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MCAssembler &getAssembler() const { return Assembler; }
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/// \brief Update the layout because a fragment has been resized. The
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/// fragments size should have already been updated, the \arg SlideAmount is
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/// the delta from the old size.
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void UpdateForSlide(MCFragment *F, int SlideAmount);
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/// @name Section Access (in layout order)
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/// @{
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iterator begin() { return SectionOrder.begin(); }
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const_iterator begin() const { return SectionOrder.begin(); }
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iterator end() {return SectionOrder.end();}
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const_iterator end() const {return SectionOrder.end();}
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/// @}
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/// @name Fragment Layout Data
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/// @{
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/// \brief Get the effective size of the given fragment, as computed in the
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/// current layout.
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uint64_t getFragmentEffectiveSize(const MCFragment *F) const;
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/// \brief Set the effective size of the given fragment.
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void setFragmentEffectiveSize(MCFragment *F, uint64_t Value);
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/// \brief Get the offset of the given fragment inside its containing section.
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uint64_t getFragmentOffset(const MCFragment *F) const;
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/// \brief Set the offset of the given fragment inside its containing section.
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void setFragmentOffset(MCFragment *F, uint64_t Value);
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/// @}
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/// @name Section Layout Data
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/// @{
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/// \brief Get the computed address of the given section.
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uint64_t getSectionAddress(const MCSectionData *SD) const;
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/// \brief Set the computed address of the given section.
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void setSectionAddress(MCSectionData *SD, uint64_t Value);
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/// \brief Get the data size of the given section, as emitted to the object
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/// file. This may include additional padding, or be 0 for virtual sections.
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uint64_t getSectionFileSize(const MCSectionData *SD) const;
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/// \brief Set the data size of the given section.
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void setSectionFileSize(MCSectionData *SD, uint64_t Value);
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/// \brief Get the actual data size of the given section.
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uint64_t getSectionSize(const MCSectionData *SD) const;
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/// \brief Set the actual data size of the given section.
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void setSectionSize(MCSectionData *SD, uint64_t Value);
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/// @}
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/// @name Utility Functions
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/// @{
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/// \brief Get the address of the given fragment, as computed in the current
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/// layout.
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uint64_t getFragmentAddress(const MCFragment *F) const;
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/// \brief Get the address of the given symbol, as computed in the current
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/// layout.
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uint64_t getSymbolAddress(const MCSymbolData *SD) const;
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/// @}
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};
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} // end namespace llvm
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#endif
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