1 //===- MCAsmLayout.h - Assembly Layout Object -------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_MC_MCASMLAYOUT_H
11 #define LLVM_MC_MCASMLAYOUT_H
19 /// Encapsulates the layout of an assembly file at a particular point in time.
21 /// Assembly may requiring compute multiple layouts for a particular assembly
22 /// file as part of the relaxation process. This class encapsulates the layout
23 /// at a single point in time in such a way that it is always possible to
24 /// efficiently compute the exact addresses of any symbol in the assembly file,
25 /// even during the relaxation process.
28 MCAssembler &Assembler;
31 MCAsmLayout(MCAssembler &_Assembler) : Assembler(_Assembler) {}
33 /// Get the assembler object this is a layout for.
34 MCAssembler &getAssembler() const { return Assembler; }
36 /// \brief Update the layout because a fragment has been resized. The
37 /// fragments size should have already been updated, the \arg SlideAmount is
38 /// the delta from the old size.
39 void UpdateForSlide(MCFragment *F, int SlideAmount);
41 /// @name Fragment Layout Data
44 /// \brief Get the effective size of the given fragment, as computed in the
46 uint64_t getFragmentEffectiveSize(const MCFragment *F) const;
48 /// \brief Set the effective size of the given fragment.
49 void setFragmentEffectiveSize(MCFragment *F, uint64_t Value);
51 /// \brief Get the offset of the given fragment inside its containing section.
52 uint64_t getFragmentOffset(const MCFragment *F) const;
54 /// \brief Set the offset of the given fragment inside its containing section.
55 void setFragmentOffset(MCFragment *F, uint64_t Value);
58 /// @name Section Layout Data
61 /// \brief Get the computed address of the given section.
62 uint64_t getSectionAddress(const MCSectionData *SD) const;
64 /// \brief Set the computed address of the given section.
65 void setSectionAddress(MCSectionData *SD, uint64_t Value);
67 /// \brief Get the data size of the given section, as emitted to the object
68 /// file. This may include additional padding, or be 0 for virtual sections.
69 uint64_t getSectionFileSize(const MCSectionData *SD) const;
71 /// \brief Set the data size of the given section.
72 void setSectionFileSize(MCSectionData *SD, uint64_t Value);
74 /// \brief Get the actual data size of the given section.
75 uint64_t getSectionSize(const MCSectionData *SD) const;
77 /// \brief Set the actual data size of the given section.
78 void setSectionSize(MCSectionData *SD, uint64_t Value);
81 /// @name Utility Functions
84 /// \brief Get the address of the given fragment, as computed in the current
86 uint64_t getFragmentAddress(const MCFragment *F) const;
88 /// \brief Get the address of the given symbol, as computed in the current
90 uint64_t getSymbolAddress(const MCSymbolData *SD) const;
95 } // end namespace llvm