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 using namespace lldb_private::dwarf;
14 using namespace lldb_private::plugin::dwarf;
15
DWARFAttributes()16 DWARFAttributes::DWARFAttributes() : m_infos() {}
17
18 DWARFAttributes::~DWARFAttributes() = default;
19
FindAttributeIndex(dw_attr_t attr) const20 uint32_t DWARFAttributes::FindAttributeIndex(dw_attr_t attr) const {
21 collection::const_iterator end = m_infos.end();
22 collection::const_iterator beg = m_infos.begin();
23 collection::const_iterator pos;
24 for (pos = beg; pos != end; ++pos) {
25 if (pos->attr.get_attr() == attr)
26 return std::distance(beg, pos);
27 }
28 return UINT32_MAX;
29 }
30
Append(const DWARFFormValue & form_value,dw_offset_t attr_die_offset,dw_attr_t attr)31 void DWARFAttributes::Append(const DWARFFormValue &form_value,
32 dw_offset_t attr_die_offset, dw_attr_t attr) {
33 AttributeValue attr_value = {const_cast<DWARFUnit *>(form_value.GetUnit()),
34 attr_die_offset,
35 {attr, form_value.Form(), form_value.Value()}};
36 m_infos.push_back(attr_value);
37 }
38
ExtractFormValueAtIndex(uint32_t i,DWARFFormValue & form_value) const39 bool DWARFAttributes::ExtractFormValueAtIndex(
40 uint32_t i, DWARFFormValue &form_value) const {
41 const DWARFUnit *cu = CompileUnitAtIndex(i);
42 form_value.SetUnit(cu);
43 form_value.SetForm(FormAtIndex(i));
44 if (form_value.Form() == DW_FORM_implicit_const) {
45 form_value.SetValue(ValueAtIndex(i));
46 return true;
47 }
48 lldb::offset_t offset = DIEOffsetAtIndex(i);
49 return form_value.ExtractValue(cu->GetData(), &offset);
50 }
51
52 DWARFDIE
FormValueAsReference(dw_attr_t attr) const53 DWARFAttributes::FormValueAsReference(dw_attr_t attr) const {
54 const uint32_t attr_idx = FindAttributeIndex(attr);
55 if (attr_idx != UINT32_MAX)
56 return FormValueAsReferenceAtIndex(attr_idx);
57 return {};
58 }
59
60 DWARFDIE
FormValueAsReferenceAtIndex(uint32_t i) const61 DWARFAttributes::FormValueAsReferenceAtIndex(uint32_t i) const {
62 DWARFFormValue form_value;
63 if (ExtractFormValueAtIndex(i, form_value))
64 return form_value.Reference();
65 return {};
66 }
67