X86GOT.cpp revision affc150dc44fab1911775a49636d0ce85333b634 
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#include <mcld/LD/LDFileFormat.h>
11#include <mcld/Support/MsgHandling.h>
12#include <new>
13
14namespace {
15  const size_t X86GOTEntrySize = 4;
16}
17
18using namespace mcld;
19
20//===----------------------------------------------------------------------===//
21// X86GOT
22X86GOT::X86GOT(LDSection& pSection, llvm::MCSectionData& pSectionData)
23             : GOT(pSection, pSectionData, X86GOTEntrySize),
24               m_GOTIterator(), m_fIsVisit(false)
25{
26}
27
28X86GOT::~X86GOT()
29{
30}
31
32void X86GOT::reserveEntry(size_t pNum)
33{
34  GOTEntry* Entry = 0;
35
36  for (size_t i = 0; i < pNum; i++) {
37    Entry = new (std::nothrow) GOTEntry(0, X86GOTEntrySize,
38                                        &m_SectionData);
39
40    if (!Entry)
41      fatal(diag::fail_allocate_memory) << "GOTEntry";
42
43    m_Section.setSize(m_Section.size() + X86GOTEntrySize);
44  }
45}
46
47
48GOTEntry* X86GOT::getEntry(const ResolveInfo& pInfo, bool& pExist)
49{
50  // first time visit this function, set m_GOTIterator
51  if(!m_fIsVisit) {
52    assert( !m_SectionData.getFragmentList().empty() &&
53             "DynRelSection contains no entries.");
54    m_GOTIterator = m_SectionData.getFragmentList().begin();
55    m_fIsVisit = true;
56  }
57
58
59  GOTEntry *&Entry = m_GOTMap[&pInfo];
60  pExist = 1;
61
62  if (!Entry) {
63    pExist = 0;
64    assert(m_GOTIterator != m_SectionData.getFragmentList().end()
65             && "The number of GOT Entries and ResolveInfo doesn't match!");
66    Entry = llvm::cast<GOTEntry>(&(*m_GOTIterator));
67    ++m_GOTIterator;
68  }
69  return Entry;
70}
71
72X86GOT::iterator X86GOT::begin()
73{
74  return m_SectionData.getFragmentList().begin();
75}
76
77X86GOT::const_iterator X86GOT::begin() const
78{
79  return m_SectionData.getFragmentList().begin();
80}
81
82X86GOT::iterator X86GOT::end()
83{
84  return m_SectionData.getFragmentList().end();
85}
86
87X86GOT::const_iterator X86GOT::end() const
88{
89  return m_SectionData.getFragmentList().end();
90}
91
92