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
13 #include "llvm/ADT/SmallVector.h"
21 /// Encapsulates the layout of an assembly file at a particular point in time.
23 /// Assembly may requiring compute multiple layouts for a particular assembly
24 /// file as part of the relaxation process. This class encapsulates the layout
25 /// at a single point in time in such a way that it is always possible to
26 /// efficiently compute the exact addresses of any symbol in the assembly file,
27 /// even during the relaxation process.
30 typedef llvm::SmallVectorImpl<MCSectionData*>::const_iterator const_iterator;
31 typedef llvm::SmallVectorImpl<MCSectionData*>::iterator iterator;
34 MCAssembler &Assembler;
36 /// List of sections in layout order.
37 llvm::SmallVector<MCSectionData*, 16> SectionOrder;
40 MCAsmLayout(MCAssembler &_Assembler);
42 /// Get the assembler object this is a layout for.
43 MCAssembler &getAssembler() const { return Assembler; }
45 /// \brief Update the layout because a fragment has been resized. The
46 /// fragments size should have already been updated, the \arg SlideAmount is
47 /// the delta from the old size.
48 void UpdateForSlide(MCFragment *F, int SlideAmount);
50 /// @name Section Access (in layout order)
53 iterator begin() { return SectionOrder.begin(); }
54 const_iterator begin() const { return SectionOrder.begin(); }
56 iterator end() {return SectionOrder.end();}
57 const_iterator end() const {return SectionOrder.end();}
60 /// @name Fragment Layout Data
63 /// \brief Get the effective size of the given fragment, as computed in the
65 uint64_t getFragmentEffectiveSize(const MCFragment *F) const;
67 /// \brief Set the effective size of the given fragment.
68 void setFragmentEffectiveSize(MCFragment *F, uint64_t Value);
70 /// \brief Get the offset of the given fragment inside its containing section.
71 uint64_t getFragmentOffset(const MCFragment *F) const;
73 /// \brief Set the offset of the given fragment inside its containing section.
74 void setFragmentOffset(MCFragment *F, uint64_t Value);
77 /// @name Section Layout Data
80 /// \brief Get the computed address of the given section.
81 uint64_t getSectionAddress(const MCSectionData *SD) const;
83 /// \brief Set the computed address of the given section.
84 void setSectionAddress(MCSectionData *SD, uint64_t Value);
86 /// \brief Get the data size of the given section, as emitted to the object
87 /// file. This may include additional padding, or be 0 for virtual sections.
88 uint64_t getSectionFileSize(const MCSectionData *SD) const;
90 /// \brief Set the data size of the given section.
91 void setSectionFileSize(MCSectionData *SD, uint64_t Value);
93 /// \brief Get the actual data size of the given section.
94 uint64_t getSectionSize(const MCSectionData *SD) const;
96 /// \brief Set the actual data size of the given section.
97 void setSectionSize(MCSectionData *SD, uint64_t Value);
100 /// @name Utility Functions
103 /// \brief Get the address of the given fragment, as computed in the current
105 uint64_t getFragmentAddress(const MCFragment *F) const;
107 /// \brief Get the address of the given symbol, as computed in the current
109 uint64_t getSymbolAddress(const MCSymbolData *SD) const;
114 } // end namespace llvm