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
DWARFAttributes()15 DWARFAttributes::DWARFAttributes() : m_infos() {}
16
17 DWARFAttributes::~DWARFAttributes() = default;
18
FindAttributeIndex(dw_attr_t attr) const19 uint32_t DWARFAttributes::FindAttributeIndex(dw_attr_t attr) const {
20 collection::const_iterator end = m_infos.end();
21 collection::const_iterator beg = m_infos.begin();
22 collection::const_iterator pos;
23 for (pos = beg; pos != end; ++pos) {
24 if (pos->attr.get_attr() == attr)
25 return std::distance(beg, pos);
26 }
27 return UINT32_MAX;
28 }
29
Append(const DWARFFormValue & form_value,dw_offset_t attr_die_offset,dw_attr_t attr)30 void DWARFAttributes::Append(const DWARFFormValue &form_value,
31 dw_offset_t attr_die_offset, dw_attr_t attr) {
32 AttributeValue attr_value = {const_cast<DWARFUnit *>(form_value.GetUnit()),
33 attr_die_offset,
34 {attr, form_value.Form(), form_value.Value()}};
35 m_infos.push_back(attr_value);
36 }
37
ExtractFormValueAtIndex(uint32_t i,DWARFFormValue & form_value) const38 bool DWARFAttributes::ExtractFormValueAtIndex(
39 uint32_t i, DWARFFormValue &form_value) const {
40 const DWARFUnit *cu = CompileUnitAtIndex(i);
41 form_value.SetUnit(cu);
42 form_value.SetForm(FormAtIndex(i));
43 if (form_value.Form() == DW_FORM_implicit_const) {
44 form_value.SetValue(ValueAtIndex(i));
45 return true;
46 }
47 lldb::offset_t offset = DIEOffsetAtIndex(i);
48 return form_value.ExtractValue(cu->GetData(), &offset);
49 }
50
51 DWARFDIE
FormValueAsReference(dw_attr_t attr) const52 DWARFAttributes::FormValueAsReference(dw_attr_t attr) const {
53 const uint32_t attr_idx = FindAttributeIndex(attr);
54 if (attr_idx != UINT32_MAX)
55 return FormValueAsReferenceAtIndex(attr_idx);
56 return {};
57 }
58
59 DWARFDIE
FormValueAsReferenceAtIndex(uint32_t i) const60 DWARFAttributes::FormValueAsReferenceAtIndex(uint32_t i) const {
61 DWARFFormValue form_value;
62 if (ExtractFormValueAtIndex(i, form_value))
63 return form_value.Reference();
64 return {};
65 }
66