X86GOT.cpp revision cedee4b38f4786845183be7f5916dd520a170ae0 
1//===- impl.cpp -----------------------------------------------------------===//
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#include "X86GOT.h"
10
11#include <new>
12
13#include <llvm/Support/Casting.h>
14
15#include <mcld/LD/LDFileFormat.h>
16#include <mcld/LD/SectionData.h>
17#include <mcld/Support/MsgHandling.h>
18
19namespace {
20  const size_t X86GOTEntrySize = 4;
21}
22
23using namespace mcld;
24
25//===----------------------------------------------------------------------===//
26// X86GOT
27//===----------------------------------------------------------------------===//
28X86GOT::X86GOT(LDSection& pSection, SectionData& pSectionData)
29             : GOT(pSection, pSectionData, X86GOTEntrySize),
30               m_GOTIterator(), m_fIsVisit(false)
31{
32}
33
34X86GOT::~X86GOT()
35{
36}
37
38void X86GOT::reserveEntry(size_t pNum)
39{
40  GOTEntry* Entry = 0;
41
42  for (size_t i = 0; i < pNum; i++) {
43    Entry = new (std::nothrow) GOTEntry(0, X86GOTEntrySize,
44                                        &m_SectionData);
45
46    if (!Entry)
47      fatal(diag::fail_allocate_memory_got);
48
49    m_Section.setSize(m_Section.size() + X86GOTEntrySize);
50  }
51}
52
53
54GOTEntry* X86GOT::getEntry(const ResolveInfo& pInfo, bool& pExist)
55{
56  // first time visit this function, set m_GOTIterator
57  if(!m_fIsVisit) {
58    assert( !m_SectionData.getFragmentList().empty() &&
59             "DynRelSection contains no entries.");
60    m_GOTIterator = m_SectionData.getFragmentList().begin();
61    m_fIsVisit = true;
62  }
63
64
65  GOTEntry *&Entry = m_GOTMap[&pInfo];
66  pExist = 1;
67
68  if (!Entry) {
69    pExist = 0;
70    assert(m_GOTIterator != m_SectionData.getFragmentList().end()
71             && "The number of GOT Entries and ResolveInfo doesn't match!");
72    Entry = llvm::cast<GOTEntry>(&(*m_GOTIterator));
73    ++m_GOTIterator;
74  }
75  return Entry;
76}
77
78X86GOT::iterator X86GOT::begin()
79{
80  return m_SectionData.getFragmentList().begin();
81}
82
83X86GOT::const_iterator X86GOT::begin() const
84{
85  return m_SectionData.getFragmentList().begin();
86}
87
88X86GOT::iterator X86GOT::end()
89{
90  return m_SectionData.getFragmentList().end();
91}
92
93X86GOT::const_iterator X86GOT::end() const
94{
95  return m_SectionData.getFragmentList().end();
96}
97
98