1 //===-- DWARFAttribute.cpp ------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "DWARFAttribute.h"
10 #include "DWARFUnit.h"
11 #include "DWARFDebugInfo.h"
12 
13 DWARFAttributes::DWARFAttributes() : m_infos() {}
14 
15 DWARFAttributes::~DWARFAttributes() = default;
16 
17 uint32_t DWARFAttributes::FindAttributeIndex(dw_attr_t attr) const {
18   collection::const_iterator end = m_infos.end();
19   collection::const_iterator beg = m_infos.begin();
20   collection::const_iterator pos;
21   for (pos = beg; pos != end; ++pos) {
22     if (pos->attr.get_attr() == attr)
23       return std::distance(beg, pos);
24   }
25   return UINT32_MAX;
26 }
27 
28 void DWARFAttributes::Append(const DWARFFormValue &form_value,
29                              dw_offset_t attr_die_offset, dw_attr_t attr) {
30   AttributeValue attr_value = {const_cast<DWARFUnit *>(form_value.GetUnit()),
31                                attr_die_offset,
32                                {attr, form_value.Form(), form_value.Value()}};
33   m_infos.push_back(attr_value);
34 }
35 
36 bool DWARFAttributes::ExtractFormValueAtIndex(
37     uint32_t i, DWARFFormValue &form_value) const {
38   const DWARFUnit *cu = CompileUnitAtIndex(i);
39   form_value.SetUnit(cu);
40   form_value.SetForm(FormAtIndex(i));
41   if (form_value.Form() == DW_FORM_implicit_const) {
42     form_value.SetValue(ValueAtIndex(i));
43     return true;
44   }
45   lldb::offset_t offset = DIEOffsetAtIndex(i);
46   return form_value.ExtractValue(cu->GetData(), &offset);
47 }
48 
49 DWARFDIE
50 DWARFAttributes::FormValueAsReference(dw_attr_t attr) const {
51   const uint32_t attr_idx = FindAttributeIndex(attr);
52   if (attr_idx != UINT32_MAX)
53     return FormValueAsReferenceAtIndex(attr_idx);
54   return {};
55 }
56 
57 DWARFDIE
58 DWARFAttributes::FormValueAsReferenceAtIndex(uint32_t i) const {
59   DWARFFormValue form_value;
60   if (ExtractFormValueAtIndex(i, form_value))
61     return form_value.Reference();
62   return {};
63 }
64