ARMGOT.h revision 87f34658dec9097d987d254a990ea7f311bfc95f 
1//===- ARMGOT.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_ARM_GOT_H
10#define MCLD_ARM_GOT_H
11#ifdef ENABLE_UNITTEST
12#include <gtest.h>
13#endif
14
15#include <mcld/Target/GOT.h>
16#include <mcld/Support/MemoryRegion.h>
17#include <llvm/ADT/DenseMap.h>
18#include <vector>
19
20namespace mcld {
21
22class LDSection;
23
24/** \class ARMGOTEntry
25 *  \brief GOT Entry with size of 4 bytes
26 */
27class ARMGOTEntry : public GOT::Entry<4>
28{
29public:
30  ARMGOTEntry(uint64_t pContent, SectionData* pParent)
31   : GOT::Entry<4>(pContent, pParent)
32  {}
33};
34
35/** \class ARMGOT
36 *  \brief ARM Global Offset Table.
37 *
38 *  ARM GOT integrates traditional .got.plt and .got sections into one.
39 *  Traditional .got.plt is placed in the front part of GOT (PLTGOT), and
40 *  traditional .got is placed in the rear part of GOT (GOT).
41 *
42 *  ARM .got
43 *            +--------------+
44 *            |    GOT0      |
45 *            +--------------+
46 *            |    GOTPLT    |
47 *            +--------------+
48 *            |    GOT       |
49 *            +--------------+
50 *
51 */
52class ARMGOT : public GOT
53{
54public:
55  ARMGOT(LDSection &pSection);
56
57  ~ARMGOT();
58
59  ARMGOTEntry* createGOT();
60  ARMGOTEntry* createGOTPLT();
61
62  void finalizeSectionSize();
63
64  uint64_t emit(MemoryRegion& pRegion);
65
66  void applyGOT0(uint64_t pAddress);
67
68  void applyGOTPLT(uint64_t pPLTBase);
69
70  bool hasGOT1() const;
71
72private:
73  typedef std::vector<ARMGOTEntry*> EntryListType;
74  typedef EntryListType::iterator entry_iterator;
75  typedef EntryListType::const_iterator const_entry_iterator;
76
77private:
78  ARMGOTEntry* m_pGOTPLTFront;
79  ARMGOTEntry* m_pGOTFront;
80
81  /// m_GOTPLTEntries - a list of gotplt entries
82  EntryListType m_GOTPLT;
83
84  /// m_GOTEntris - a list of got entries
85  EntryListType m_GOT;
86};
87
88} // namespace of mcld
89
90#endif
91
92