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
DWARFAttributes()13 DWARFAttributes::DWARFAttributes() : m_infos() {}
14
15 DWARFAttributes::~DWARFAttributes() = default;
16
FindAttributeIndex(dw_attr_t attr) const17 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
Append(const DWARFFormValue & form_value,dw_offset_t attr_die_offset,dw_attr_t attr)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
ExtractFormValueAtIndex(uint32_t i,DWARFFormValue & form_value) const36 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
FormValueAsReference(dw_attr_t attr) const50 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
FormValueAsReferenceAtIndex(uint32_t i) const58 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