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 
13 using namespace lldb;
14 using namespace lldb_private;
15 
16 static DWARFDataExtractor LoadSection(SectionList *section_list,
17                                       SectionType section_type) {
18   if (!section_list)
19     return DWARFDataExtractor();
20 
21   auto section_sp = section_list->FindSectionByType(section_type, true);
22   if (!section_sp)
23     return DWARFDataExtractor();
24 
25   DWARFDataExtractor data;
26   section_sp->GetSectionData(data);
27   return data;
28 }
29 
30 const DWARFDataExtractor &
31 DWARFContext::LoadOrGetSection(llvm::Optional<SectionType> main_section_type,
32                                llvm::Optional<SectionType> dwo_section_type,
33                                SectionData &data) {
34   llvm::call_once(data.flag, [&] {
35     if (dwo_section_type && isDwo())
36       data.data = LoadSection(m_dwo_section_list, *dwo_section_type);
37     else if (main_section_type)
38       data.data = LoadSection(m_main_section_list, *main_section_type);
39   });
40   return data.data;
41 }
42 
43 const DWARFDataExtractor &DWARFContext::getOrLoadCuIndexData() {
44   return LoadOrGetSection(llvm::None, eSectionTypeDWARFDebugCuIndex,
45                           m_data_debug_cu_index);
46 }
47 
48 const DWARFDataExtractor &DWARFContext::getOrLoadAbbrevData() {
49   return LoadOrGetSection(eSectionTypeDWARFDebugAbbrev,
50                           eSectionTypeDWARFDebugAbbrevDwo, m_data_debug_abbrev);
51 }
52 
53 const DWARFDataExtractor &DWARFContext::getOrLoadArangesData() {
54   return LoadOrGetSection(eSectionTypeDWARFDebugAranges, llvm::None,
55                           m_data_debug_aranges);
56 }
57 
58 const DWARFDataExtractor &DWARFContext::getOrLoadAddrData() {
59   return LoadOrGetSection(eSectionTypeDWARFDebugAddr, llvm::None,
60                           m_data_debug_addr);
61 }
62 
63 const DWARFDataExtractor &DWARFContext::getOrLoadDebugInfoData() {
64   return LoadOrGetSection(eSectionTypeDWARFDebugInfo,
65                           eSectionTypeDWARFDebugInfoDwo, m_data_debug_info);
66 }
67 
68 const DWARFDataExtractor &DWARFContext::getOrLoadLineData() {
69   return LoadOrGetSection(eSectionTypeDWARFDebugLine, llvm::None,
70                           m_data_debug_line);
71 }
72 
73 const DWARFDataExtractor &DWARFContext::getOrLoadLineStrData() {
74   return LoadOrGetSection(eSectionTypeDWARFDebugLineStr, llvm::None,
75                           m_data_debug_line_str);
76 }
77 
78 const DWARFDataExtractor &DWARFContext::getOrLoadLocData() {
79   return LoadOrGetSection(eSectionTypeDWARFDebugLoc,
80                           eSectionTypeDWARFDebugLocDwo, m_data_debug_loc);
81 }
82 
83 const DWARFDataExtractor &DWARFContext::getOrLoadLocListsData() {
84   return LoadOrGetSection(eSectionTypeDWARFDebugLocLists,
85                           eSectionTypeDWARFDebugLocListsDwo,
86                           m_data_debug_loclists);
87 }
88 
89 const DWARFDataExtractor &DWARFContext::getOrLoadMacroData() {
90   return LoadOrGetSection(eSectionTypeDWARFDebugMacro, llvm::None,
91                           m_data_debug_macro);
92 }
93 
94 const DWARFDataExtractor &DWARFContext::getOrLoadRangesData() {
95   return LoadOrGetSection(eSectionTypeDWARFDebugRanges, llvm::None,
96                           m_data_debug_ranges);
97 }
98 
99 const DWARFDataExtractor &DWARFContext::getOrLoadRngListsData() {
100   return LoadOrGetSection(eSectionTypeDWARFDebugRngLists,
101                           eSectionTypeDWARFDebugRngListsDwo,
102                           m_data_debug_rnglists);
103 }
104 
105 const DWARFDataExtractor &DWARFContext::getOrLoadStrData() {
106   return LoadOrGetSection(eSectionTypeDWARFDebugStr,
107                           eSectionTypeDWARFDebugStrDwo, m_data_debug_str);
108 }
109 
110 const DWARFDataExtractor &DWARFContext::getOrLoadStrOffsetsData() {
111   return LoadOrGetSection(eSectionTypeDWARFDebugStrOffsets,
112                           eSectionTypeDWARFDebugStrOffsetsDwo,
113                           m_data_debug_str_offsets);
114 }
115 
116 const DWARFDataExtractor &DWARFContext::getOrLoadDebugTypesData() {
117   return LoadOrGetSection(eSectionTypeDWARFDebugTypes,
118                           eSectionTypeDWARFDebugTypesDwo, m_data_debug_types);
119 }
120 
121 llvm::DWARFContext &DWARFContext::GetAsLLVM() {
122   if (!m_llvm_context) {
123     llvm::StringMap<std::unique_ptr<llvm::MemoryBuffer>> section_map;
124     uint8_t addr_size = 0;
125     auto AddSection = [&](llvm::StringRef name, DWARFDataExtractor data) {
126       // Set the address size the first time we see it.
127       if (addr_size == 0)
128         addr_size = data.GetAddressByteSize();
129 
130       section_map.try_emplace(
131           name, llvm::MemoryBuffer::getMemBuffer(toStringRef(data.GetData()),
132                                                  name, false));
133     };
134 
135     AddSection("debug_line_str", getOrLoadLineStrData());
136     AddSection("debug_cu_index", getOrLoadCuIndexData());
137 
138     m_llvm_context = llvm::DWARFContext::create(section_map, addr_size);
139   }
140   return *m_llvm_context;
141 }
142