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 using namespace lldb_private::plugin::dwarf;
17
LoadSection(SectionList * section_list,SectionType section_type)18 static DWARFDataExtractor LoadSection(SectionList *section_list,
19 SectionType section_type) {
20 if (!section_list)
21 return DWARFDataExtractor();
22
23 auto section_sp = section_list->FindSectionByType(section_type, true);
24 if (!section_sp)
25 return DWARFDataExtractor();
26
27 DWARFDataExtractor data;
28 section_sp->GetSectionData(data);
29 return data;
30 }
31
32 const DWARFDataExtractor &
LoadOrGetSection(std::optional<SectionType> main_section_type,std::optional<SectionType> dwo_section_type,SectionData & data)33 DWARFContext::LoadOrGetSection(std::optional<SectionType> main_section_type,
34 std::optional<SectionType> dwo_section_type,
35 SectionData &data) {
36 llvm::call_once(data.flag, [&] {
37 if (dwo_section_type && isDwo())
38 data.data = LoadSection(m_dwo_section_list, *dwo_section_type);
39 else if (main_section_type)
40 data.data = LoadSection(m_main_section_list, *main_section_type);
41 });
42 return data.data;
43 }
44
getOrLoadCuIndexData()45 const DWARFDataExtractor &DWARFContext::getOrLoadCuIndexData() {
46 return LoadOrGetSection(std::nullopt, eSectionTypeDWARFDebugCuIndex,
47 m_data_debug_cu_index);
48 }
49
getOrLoadTuIndexData()50 const DWARFDataExtractor &DWARFContext::getOrLoadTuIndexData() {
51 return LoadOrGetSection(std::nullopt, eSectionTypeDWARFDebugTuIndex,
52 m_data_debug_tu_index);
53 }
54
getOrLoadAbbrevData()55 const DWARFDataExtractor &DWARFContext::getOrLoadAbbrevData() {
56 return LoadOrGetSection(eSectionTypeDWARFDebugAbbrev,
57 eSectionTypeDWARFDebugAbbrevDwo, m_data_debug_abbrev);
58 }
59
getOrLoadArangesData()60 const DWARFDataExtractor &DWARFContext::getOrLoadArangesData() {
61 return LoadOrGetSection(eSectionTypeDWARFDebugAranges, std::nullopt,
62 m_data_debug_aranges);
63 }
64
getOrLoadAddrData()65 const DWARFDataExtractor &DWARFContext::getOrLoadAddrData() {
66 return LoadOrGetSection(eSectionTypeDWARFDebugAddr, std::nullopt,
67 m_data_debug_addr);
68 }
69
getOrLoadDebugInfoData()70 const DWARFDataExtractor &DWARFContext::getOrLoadDebugInfoData() {
71 return LoadOrGetSection(eSectionTypeDWARFDebugInfo,
72 eSectionTypeDWARFDebugInfoDwo, m_data_debug_info);
73 }
74
getOrLoadLineData()75 const DWARFDataExtractor &DWARFContext::getOrLoadLineData() {
76 return LoadOrGetSection(eSectionTypeDWARFDebugLine, std::nullopt,
77 m_data_debug_line);
78 }
79
getOrLoadLineStrData()80 const DWARFDataExtractor &DWARFContext::getOrLoadLineStrData() {
81 return LoadOrGetSection(eSectionTypeDWARFDebugLineStr, std::nullopt,
82 m_data_debug_line_str);
83 }
84
getOrLoadLocData()85 const DWARFDataExtractor &DWARFContext::getOrLoadLocData() {
86 return LoadOrGetSection(eSectionTypeDWARFDebugLoc,
87 eSectionTypeDWARFDebugLocDwo, m_data_debug_loc);
88 }
89
getOrLoadLocListsData()90 const DWARFDataExtractor &DWARFContext::getOrLoadLocListsData() {
91 return LoadOrGetSection(eSectionTypeDWARFDebugLocLists,
92 eSectionTypeDWARFDebugLocListsDwo,
93 m_data_debug_loclists);
94 }
95
getOrLoadMacroData()96 const DWARFDataExtractor &DWARFContext::getOrLoadMacroData() {
97 return LoadOrGetSection(eSectionTypeDWARFDebugMacro, std::nullopt,
98 m_data_debug_macro);
99 }
100
getOrLoadRangesData()101 const DWARFDataExtractor &DWARFContext::getOrLoadRangesData() {
102 return LoadOrGetSection(eSectionTypeDWARFDebugRanges, std::nullopt,
103 m_data_debug_ranges);
104 }
105
getOrLoadRngListsData()106 const DWARFDataExtractor &DWARFContext::getOrLoadRngListsData() {
107 return LoadOrGetSection(eSectionTypeDWARFDebugRngLists,
108 eSectionTypeDWARFDebugRngListsDwo,
109 m_data_debug_rnglists);
110 }
111
getOrLoadStrData()112 const DWARFDataExtractor &DWARFContext::getOrLoadStrData() {
113 return LoadOrGetSection(eSectionTypeDWARFDebugStr,
114 eSectionTypeDWARFDebugStrDwo, m_data_debug_str);
115 }
116
getOrLoadStrOffsetsData()117 const DWARFDataExtractor &DWARFContext::getOrLoadStrOffsetsData() {
118 return LoadOrGetSection(eSectionTypeDWARFDebugStrOffsets,
119 eSectionTypeDWARFDebugStrOffsetsDwo,
120 m_data_debug_str_offsets);
121 }
122
getOrLoadDebugTypesData()123 const DWARFDataExtractor &DWARFContext::getOrLoadDebugTypesData() {
124 return LoadOrGetSection(eSectionTypeDWARFDebugTypes,
125 eSectionTypeDWARFDebugTypesDwo, m_data_debug_types);
126 }
127
GetAsLLVM()128 llvm::DWARFContext &DWARFContext::GetAsLLVM() {
129 if (!m_llvm_context) {
130 llvm::StringMap<std::unique_ptr<llvm::MemoryBuffer>> section_map;
131 uint8_t addr_size = 0;
132 auto AddSection = [&](llvm::StringRef name, DWARFDataExtractor data) {
133 // Set the address size the first time we see it.
134 if (addr_size == 0)
135 addr_size = data.GetAddressByteSize();
136
137 section_map.try_emplace(
138 name, llvm::MemoryBuffer::getMemBuffer(toStringRef(data.GetData()),
139 name, false));
140 };
141
142 AddSection("debug_line_str", getOrLoadLineStrData());
143 AddSection("debug_cu_index", getOrLoadCuIndexData());
144 AddSection("debug_tu_index", getOrLoadTuIndexData());
145 if (isDwo()) {
146 AddSection("debug_info.dwo", getOrLoadDebugInfoData());
147 AddSection("debug_types.dwo", getOrLoadDebugTypesData());
148 }
149 m_llvm_context = llvm::DWARFContext::create(section_map, addr_size);
150 }
151 return *m_llvm_context;
152 }
153