EhFrameHdr.h revision affc150dc44fab1911775a49636d0ce85333b634 
1//===- EhFrameHdr.h -------------------------------------------------------===//
2//
3//                     The MCLinker Project
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9#ifndef MCLD_EHFRAMEHDR_H
10#define MCLD_EHFRAMEHDR_H
11#ifdef ENABLE_UNITTEST
12#include <gtest.h>
13#endif
14#include <llvm/Support/Dwarf.h>
15#include <llvm/Support/DataTypes.h>
16#include <mcld/ADT/SizeTraits.h>
17#include <mcld/Support/MemoryArea.h>
18#include <mcld/Support/MemoryRegion.h>
19#include <mcld/MC/MCLDOutput.h>
20#include <mcld/MC/MCLinker.h>
21#include <mcld/LD/EhFrame.h>
22#include <mcld/LD/LDSection.h>
23#include <mcld/LD/CIE.h>
24#include <mcld/LD/FDE.h>
25#include <mcld/LD/Layout.h>
26
27namespace mcld
28{
29class EhFrame;
30class LDSection;
31class Output;
32class FDE;
33class MCLinker;
34
35/** \class EhFrameHdr
36 *  \brief EhFrameHdr represents .eh_frame_hdr section.
37 */
38class EhFrameHdr
39{
40public:
41  EhFrameHdr(const EhFrame& pEhFrameData,
42             const LDSection& pEhFrameSect,
43             LDSection& pEhFrameHdrSect);
44
45  ~EhFrameHdr();
46
47  /// sizeOutput - base on the fde count to size output
48  void sizeOutput();
49
50  /// emitOutput - write out eh_frame_hdr
51  template<size_t size>
52  void emitOutput(Output& pOutput, MCLinker& pLinker);
53
54private:
55  /// getFDEPC - return the address of FDE's pc
56  /// @param pFDE - FDE
57  /// @param pOffset - the output offset of FDE
58  template<size_t size>
59  typename SizeTraits<size>::Address
60  getFDEPC(const FDE& pFDE,
61           typename SizeTraits<size>::Offset pOffset,
62           const MemoryRegion& pEhFrameRegion);
63
64  template<size_t size>
65  class BSTEntry
66  {
67  public:
68    typedef std::pair<typename SizeTraits<size>::Address,
69                      typename SizeTraits<size>::Address> EntryType;
70  };
71
72  template<size_t size>
73  struct BSTEntryCompare
74    : public std::binary_function<const typename BSTEntry<size>::EntryType&,
75                                  const typename BSTEntry<size>::EntryType&,
76                                  bool>
77  {
78    bool operator()(const typename BSTEntry<size>::EntryType& X,
79                    const typename BSTEntry<size>::EntryType& Y) const
80    { return X.first < Y.first; }
81  };
82
83private:
84  /// eh_frame data
85  const EhFrame& m_EhFrameData;
86
87  /// .eh_frame section
88  const LDSection& m_EhFrameSect;
89
90  /// .eh_frame_hdr section
91  LDSection& m_EhFrameHdrSect;
92};
93
94#include "EhFrameHdr.tcc"
95
96} // namespace of mcld
97
98#endif
99
100