DWARFAttribute.cpp revision 341825 
1//===-- DWARFAttribute.cpp --------------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "DWARFAttribute.h"
11#include "DWARFUnit.h"
12#include "DWARFDebugInfo.h"
13
14DWARFAttributes::DWARFAttributes() : m_infos() {}
15
16DWARFAttributes::~DWARFAttributes() {}
17
18uint32_t DWARFAttributes::FindAttributeIndex(dw_attr_t attr) const {
19  collection::const_iterator end = m_infos.end();
20  collection::const_iterator beg = m_infos.begin();
21  collection::const_iterator pos;
22  for (pos = beg; pos != end; ++pos) {
23    if (pos->attr.get_attr() == attr)
24      return std::distance(beg, pos);
25  }
26  return UINT32_MAX;
27}
28
29void DWARFAttributes::Append(const DWARFUnit *cu,
30                             dw_offset_t attr_die_offset, dw_attr_t attr,
31                             dw_form_t form) {
32  AttributeValue attr_value = {cu, attr_die_offset, {attr, form}};
33  m_infos.push_back(attr_value);
34}
35
36bool DWARFAttributes::ContainsAttribute(dw_attr_t attr) const {
37  return FindAttributeIndex(attr) != UINT32_MAX;
38}
39
40bool DWARFAttributes::RemoveAttribute(dw_attr_t attr) {
41  uint32_t attr_index = FindAttributeIndex(attr);
42  if (attr_index != UINT32_MAX) {
43    m_infos.erase(m_infos.begin() + attr_index);
44    return true;
45  }
46  return false;
47}
48
49bool DWARFAttributes::ExtractFormValueAtIndex(
50    uint32_t i, DWARFFormValue &form_value) const {
51  const DWARFUnit *cu = CompileUnitAtIndex(i);
52  form_value.SetCompileUnit(cu);
53  form_value.SetForm(FormAtIndex(i));
54  lldb::offset_t offset = DIEOffsetAtIndex(i);
55  return form_value.ExtractValue(cu->GetData(), &offset);
56}
57
58uint64_t DWARFAttributes::FormValueAsUnsigned(dw_attr_t attr,
59                                              uint64_t fail_value) const {
60  const uint32_t attr_idx = FindAttributeIndex(attr);
61  if (attr_idx != UINT32_MAX)
62    return FormValueAsUnsignedAtIndex(attr_idx, fail_value);
63  return fail_value;
64}
65
66uint64_t
67DWARFAttributes::FormValueAsUnsignedAtIndex(uint32_t i,
68                                            uint64_t fail_value) const {
69  DWARFFormValue form_value;
70  if (ExtractFormValueAtIndex(i, form_value))
71    return form_value.Reference();
72  return fail_value;
73}
74