DWARFAbbreviationDeclaration.cpp revision 280031 
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
14#include "DWARFFormValue.h"
15
16using namespace lldb_private;
17
18DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration() :
19    m_code  (InvalidCode),
20    m_tag   (0),
21    m_has_children (0),
22    m_attributes()
23{
24}
25
26DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration(dw_tag_t tag, uint8_t has_children) :
27    m_code  (InvalidCode),
28    m_tag   (tag),
29    m_has_children (has_children),
30    m_attributes()
31{
32}
33
34bool
35DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor& data, lldb::offset_t* offset_ptr)
36{
37    return Extract(data, offset_ptr, data.GetULEB128(offset_ptr));
38}
39
40bool
41DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor& data, lldb::offset_t *offset_ptr, dw_uleb128_t code)
42{
43    m_code = code;
44    m_attributes.clear();
45    if (m_code)
46    {
47        m_tag = data.GetULEB128(offset_ptr);
48        m_has_children = data.GetU8(offset_ptr);
49
50        while (data.ValidOffset(*offset_ptr))
51        {
52            dw_attr_t attr = data.GetULEB128(offset_ptr);
53            dw_form_t form = data.GetULEB128(offset_ptr);
54
55            if (attr && form)
56                m_attributes.push_back(DWARFAttribute(attr, form));
57            else
58                break;
59        }
60
61        return m_tag != 0;
62    }
63    else
64    {
65        m_tag = 0;
66        m_has_children = 0;
67    }
68
69    return false;
70}
71
72
73void
74DWARFAbbreviationDeclaration::Dump(Stream *s)  const
75{
76    s->Printf("Debug Abbreviation Declaration: code = 0x%4.4x, tag = %s, has_children = %s\n", m_code, DW_TAG_value_to_name(m_tag), DW_CHILDREN_value_to_name(m_has_children));
77
78    DWARFAttribute::const_iterator pos;
79
80    for (pos = m_attributes.begin(); pos != m_attributes.end(); ++pos)
81        s->Printf("        attr = %s, form = %s\n", DW_AT_value_to_name(pos->get_attr()), DW_FORM_value_to_name(pos->get_form()));
82
83    s->Printf("\n");
84}
85
86
87
88bool
89DWARFAbbreviationDeclaration::IsValid()
90{
91    return m_code != 0 && m_tag != 0;
92}
93
94
95
96uint32_t
97DWARFAbbreviationDeclaration::FindAttributeIndex(dw_attr_t attr) const
98{
99    uint32_t i;
100    const uint32_t kNumAttributes = m_attributes.size();
101    for (i = 0; i < kNumAttributes; ++i)
102    {
103        if (m_attributes[i].get_attr() == attr)
104            return i;
105    }
106    return DW_INVALID_INDEX;
107}
108
109
110bool
111DWARFAbbreviationDeclaration::operator == (const DWARFAbbreviationDeclaration& rhs) const
112{
113    return Tag()            == rhs.Tag()
114        && HasChildren()    == rhs.HasChildren()
115        && Attributes()     == rhs.Attributes();
116}
117
118