1 //===-- DWARFContext.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 "DWARFContext.h"
10
11 #include "lldb/Core/Section.h"
12 #include <optional>
13
14 using namespace lldb;
15 using namespace lldb_private;
16
LoadSection(SectionList * section_list,SectionType section_type)17 static DWARFDataExtractor LoadSection(SectionList *section_list,
18 SectionType section_type) {
19 if (!section_list)
20 return DWARFDataExtractor();
21
22 auto section_sp = section_list->FindSectionByType(section_type, true);
23 if (!section_sp)
24 return DWARFDataExtractor();
25
26 DWARFDataExtractor data;
27 section_sp->GetSectionData(data);
28 return data;
29 }
30
31 const DWARFDataExtractor &
LoadOrGetSection(std::optional<SectionType> main_section_type,std::optional<SectionType> dwo_section_type,SectionData & data)32 DWARFContext::LoadOrGetSection(std::optional<SectionType> main_section_type,
33 std::optional<SectionType> dwo_section_type,
34 SectionData &data) {
35 llvm::call_once(data.flag, [&] {
36 if (dwo_section_type && isDwo())
37 data.data = LoadSection(m_dwo_section_list, *dwo_section_type);
38 else if (main_section_type)
39 data.data = LoadSection(m_main_section_list, *main_section_type);
40 });
41 return data.data;
42 }
43
getOrLoadCuIndexData()44 const DWARFDataExtractor &DWARFContext::getOrLoadCuIndexData() {
45 return LoadOrGetSection(std::nullopt, eSectionTypeDWARFDebugCuIndex,
46 m_data_debug_cu_index);
47 }
48
getOrLoadTuIndexData()49 const DWARFDataExtractor &DWARFContext::getOrLoadTuIndexData() {
50 return LoadOrGetSection(std::nullopt, eSectionTypeDWARFDebugTuIndex,
51 m_data_debug_tu_index);
52 }
53
getOrLoadAbbrevData()54 const DWARFDataExtractor &DWARFContext::getOrLoadAbbrevData() {
55 return LoadOrGetSection(eSectionTypeDWARFDebugAbbrev,
56 eSectionTypeDWARFDebugAbbrevDwo, m_data_debug_abbrev);
57 }
58
getOrLoadArangesData()59 const DWARFDataExtractor &DWARFContext::getOrLoadArangesData() {
60 return LoadOrGetSection(eSectionTypeDWARFDebugAranges, std::nullopt,
61 m_data_debug_aranges);
62 }
63
getOrLoadAddrData()64 const DWARFDataExtractor &DWARFContext::getOrLoadAddrData() {
65 return LoadOrGetSection(eSectionTypeDWARFDebugAddr, std::nullopt,
66 m_data_debug_addr);
67 }
68
getOrLoadDebugInfoData()69 const DWARFDataExtractor &DWARFContext::getOrLoadDebugInfoData() {
70 return LoadOrGetSection(eSectionTypeDWARFDebugInfo,
71 eSectionTypeDWARFDebugInfoDwo, m_data_debug_info);
72 }
73
getOrLoadLineData()74 const DWARFDataExtractor &DWARFContext::getOrLoadLineData() {
75 return LoadOrGetSection(eSectionTypeDWARFDebugLine, std::nullopt,
76 m_data_debug_line);
77 }
78
getOrLoadLineStrData()79 const DWARFDataExtractor &DWARFContext::getOrLoadLineStrData() {
80 return LoadOrGetSection(eSectionTypeDWARFDebugLineStr, std::nullopt,
81 m_data_debug_line_str);
82 }
83
getOrLoadLocData()84 const DWARFDataExtractor &DWARFContext::getOrLoadLocData() {
85 return LoadOrGetSection(eSectionTypeDWARFDebugLoc,
86 eSectionTypeDWARFDebugLocDwo, m_data_debug_loc);
87 }
88
getOrLoadLocListsData()89 const DWARFDataExtractor &DWARFContext::getOrLoadLocListsData() {
90 return LoadOrGetSection(eSectionTypeDWARFDebugLocLists,
91 eSectionTypeDWARFDebugLocListsDwo,
92 m_data_debug_loclists);
93 }
94
getOrLoadMacroData()95 const DWARFDataExtractor &DWARFContext::getOrLoadMacroData() {
96 return LoadOrGetSection(eSectionTypeDWARFDebugMacro, std::nullopt,
97 m_data_debug_macro);
98 }
99
getOrLoadRangesData()100 const DWARFDataExtractor &DWARFContext::getOrLoadRangesData() {
101 return LoadOrGetSection(eSectionTypeDWARFDebugRanges, std::nullopt,
102 m_data_debug_ranges);
103 }
104
getOrLoadRngListsData()105 const DWARFDataExtractor &DWARFContext::getOrLoadRngListsData() {
106 return LoadOrGetSection(eSectionTypeDWARFDebugRngLists,
107 eSectionTypeDWARFDebugRngListsDwo,
108 m_data_debug_rnglists);
109 }
110
getOrLoadStrData()111 const DWARFDataExtractor &DWARFContext::getOrLoadStrData() {
112 return LoadOrGetSection(eSectionTypeDWARFDebugStr,
113 eSectionTypeDWARFDebugStrDwo, m_data_debug_str);
114 }
115
getOrLoadStrOffsetsData()116 const DWARFDataExtractor &DWARFContext::getOrLoadStrOffsetsData() {
117 return LoadOrGetSection(eSectionTypeDWARFDebugStrOffsets,
118 eSectionTypeDWARFDebugStrOffsetsDwo,
119 m_data_debug_str_offsets);
120 }
121
getOrLoadDebugTypesData()122 const DWARFDataExtractor &DWARFContext::getOrLoadDebugTypesData() {
123 return LoadOrGetSection(eSectionTypeDWARFDebugTypes,
124 eSectionTypeDWARFDebugTypesDwo, m_data_debug_types);
125 }
126
GetAsLLVM()127 llvm::DWARFContext &DWARFContext::GetAsLLVM() {
128 if (!m_llvm_context) {
129 llvm::StringMap<std::unique_ptr<llvm::MemoryBuffer>> section_map;
130 uint8_t addr_size = 0;
131 auto AddSection = [&](llvm::StringRef name, DWARFDataExtractor data) {
132 // Set the address size the first time we see it.
133 if (addr_size == 0)
134 addr_size = data.GetAddressByteSize();
135
136 section_map.try_emplace(
137 name, llvm::MemoryBuffer::getMemBuffer(toStringRef(data.GetData()),
138 name, false));
139 };
140
141 AddSection("debug_line_str", getOrLoadLineStrData());
142 AddSection("debug_cu_index", getOrLoadCuIndexData());
143 AddSection("debug_tu_index", getOrLoadTuIndexData());
144
145 m_llvm_context = llvm::DWARFContext::create(section_map, addr_size);
146 }
147 return *m_llvm_context;
148 }
149