DWARFAbbreviationDeclaration.cpp revision 344779 
1//===-- DWARFAbbreviationDeclaration.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 "DWARFAbbreviationDeclaration.h"
11
12#include "lldb/Core/dwarf.h"
13#include "lldb/Utility/Stream.h"
14
15#include "DWARFFormValue.h"
16
17using namespace lldb_private;
18
19DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration()
20    : m_code(InvalidCode), m_tag(0), m_has_children(0), m_attributes() {}
21
22DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration(dw_tag_t tag,
23                                                           uint8_t has_children)
24    : m_code(InvalidCode), m_tag(tag), m_has_children(has_children),
25      m_attributes() {}
26
27bool DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor &data,
28                                           lldb::offset_t *offset_ptr) {
29  return Extract(data, offset_ptr, data.GetULEB128(offset_ptr));
30}
31
32bool DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor &data,
33                                           lldb::offset_t *offset_ptr,
34                                           dw_uleb128_t code) {
35  m_code = code;
36  m_attributes.clear();
37  if (m_code) {
38    m_tag = data.GetULEB128(offset_ptr);
39    m_has_children = data.GetU8(offset_ptr);
40
41    while (data.ValidOffset(*offset_ptr)) {
42      dw_attr_t attr = data.GetULEB128(offset_ptr);
43      dw_form_t form = data.GetULEB128(offset_ptr);
44      DWARFFormValue::ValueType val;
45
46      if (form == DW_FORM_implicit_const)
47        val.value.sval = data.GetULEB128(offset_ptr);
48
49      if (attr && form)
50        m_attributes.push_back(DWARFAttribute(attr, form, val));
51      else
52        break;
53    }
54
55    return m_tag != 0;
56  } else {
57    m_tag = 0;
58    m_has_children = 0;
59  }
60
61  return false;
62}
63
64void DWARFAbbreviationDeclaration::Dump(Stream *s) const {
65  s->Printf("Debug Abbreviation Declaration: code = 0x%4.4x, tag = %s, "
66            "has_children = %s\n",
67            m_code, DW_TAG_value_to_name(m_tag),
68            DW_CHILDREN_value_to_name(m_has_children));
69
70  DWARFAttribute::const_iterator pos;
71
72  for (pos = m_attributes.begin(); pos != m_attributes.end(); ++pos)
73    s->Printf("        attr = %s, form = %s\n",
74              DW_AT_value_to_name(pos->get_attr()),
75              DW_FORM_value_to_name(pos->get_form()));
76
77  s->Printf("\n");
78}
79
80bool DWARFAbbreviationDeclaration::IsValid() {
81  return m_code != 0 && m_tag != 0;
82}
83
84uint32_t
85DWARFAbbreviationDeclaration::FindAttributeIndex(dw_attr_t attr) const {
86  uint32_t i;
87  const uint32_t kNumAttributes = m_attributes.size();
88  for (i = 0; i < kNumAttributes; ++i) {
89    if (m_attributes[i].get_attr() == attr)
90      return i;
91  }
92  return DW_INVALID_INDEX;
93}
94
95bool DWARFAbbreviationDeclaration::
96operator==(const DWARFAbbreviationDeclaration &rhs) const {
97  return Tag() == rhs.Tag() && HasChildren() == rhs.HasChildren() &&
98         Attributes() == rhs.Attributes();
99}
100