1 //===-- SymbolFileDWARFDwp.cpp ----------------------------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "SymbolFileDWARFDwp.h"
11
12 #include "lldb/Core/Section.h"
13 #include "lldb/Symbol/ObjectFile.h"
14
15 #include "SymbolFileDWARFDwoDwp.h"
16
17 static llvm::DWARFSectionKind
lldbSectTypeToLlvmSectionKind(lldb::SectionType type)18 lldbSectTypeToLlvmSectionKind(lldb::SectionType type) {
19 switch (type) {
20 case lldb::eSectionTypeDWARFDebugInfo:
21 return llvm::DW_SECT_INFO;
22 // case lldb::eSectionTypeDWARFDebugTypes:
23 // return llvm::DW_SECT_TYPES;
24 case lldb::eSectionTypeDWARFDebugAbbrev:
25 return llvm::DW_SECT_ABBREV;
26 case lldb::eSectionTypeDWARFDebugLine:
27 return llvm::DW_SECT_LINE;
28 case lldb::eSectionTypeDWARFDebugLoc:
29 return llvm::DW_SECT_LOC;
30 case lldb::eSectionTypeDWARFDebugStrOffsets:
31 return llvm::DW_SECT_STR_OFFSETS;
32 // case lldb::eSectionTypeDWARFDebugMacinfo:
33 // return llvm::DW_SECT_MACINFO;
34 case lldb::eSectionTypeDWARFDebugMacro:
35 return llvm::DW_SECT_MACRO;
36 default:
37 // Note: 0 is an invalid dwarf section kind.
38 return llvm::DWARFSectionKind(0);
39 }
40 }
41
42 std::unique_ptr<SymbolFileDWARFDwp>
Create(lldb::ModuleSP module_sp,const lldb_private::FileSpec & file_spec)43 SymbolFileDWARFDwp::Create(lldb::ModuleSP module_sp,
44 const lldb_private::FileSpec &file_spec) {
45 const lldb::offset_t file_offset = 0;
46 lldb::DataBufferSP file_data_sp;
47 lldb::offset_t file_data_offset = 0;
48 lldb::ObjectFileSP obj_file = lldb_private::ObjectFile::FindPlugin(
49 module_sp, &file_spec, file_offset,
50 lldb_private::FileSystem::Instance().GetByteSize(file_spec), file_data_sp,
51 file_data_offset);
52 if (obj_file == nullptr)
53 return nullptr;
54
55 std::unique_ptr<SymbolFileDWARFDwp> dwp_symfile(
56 new SymbolFileDWARFDwp(module_sp, obj_file));
57
58 lldb_private::DWARFDataExtractor debug_cu_index;
59 if (!dwp_symfile->LoadRawSectionData(lldb::eSectionTypeDWARFDebugCuIndex,
60 debug_cu_index))
61 return nullptr;
62
63 llvm::DataExtractor llvm_debug_cu_index(
64 llvm::StringRef(debug_cu_index.PeekCStr(0), debug_cu_index.GetByteSize()),
65 debug_cu_index.GetByteOrder() == lldb::eByteOrderLittle,
66 debug_cu_index.GetAddressByteSize());
67 if (!dwp_symfile->m_debug_cu_index.parse(llvm_debug_cu_index))
68 return nullptr;
69 dwp_symfile->InitDebugCUIndexMap();
70 return dwp_symfile;
71 }
72
InitDebugCUIndexMap()73 void SymbolFileDWARFDwp::InitDebugCUIndexMap() {
74 m_debug_cu_index_map.clear();
75 for (const auto &entry : m_debug_cu_index.getRows())
76 m_debug_cu_index_map.emplace(entry.getSignature(), &entry);
77 }
78
SymbolFileDWARFDwp(lldb::ModuleSP module_sp,lldb::ObjectFileSP obj_file)79 SymbolFileDWARFDwp::SymbolFileDWARFDwp(lldb::ModuleSP module_sp,
80 lldb::ObjectFileSP obj_file)
81 : m_obj_file(std::move(obj_file)), m_debug_cu_index(llvm::DW_SECT_INFO)
82 {}
83
84 std::unique_ptr<SymbolFileDWARFDwo>
GetSymbolFileForDwoId(DWARFUnit * dwarf_cu,uint64_t dwo_id)85 SymbolFileDWARFDwp::GetSymbolFileForDwoId(DWARFUnit *dwarf_cu,
86 uint64_t dwo_id) {
87 return std::unique_ptr<SymbolFileDWARFDwo>(
88 new SymbolFileDWARFDwoDwp(this, m_obj_file, dwarf_cu, dwo_id));
89 }
90
LoadSectionData(uint64_t dwo_id,lldb::SectionType sect_type,lldb_private::DWARFDataExtractor & data)91 bool SymbolFileDWARFDwp::LoadSectionData(
92 uint64_t dwo_id, lldb::SectionType sect_type,
93 lldb_private::DWARFDataExtractor &data) {
94 lldb_private::DWARFDataExtractor section_data;
95 if (!LoadRawSectionData(sect_type, section_data))
96 return false;
97
98 auto it = m_debug_cu_index_map.find(dwo_id);
99 if (it == m_debug_cu_index_map.end())
100 return false;
101
102 auto *offsets =
103 it->second->getOffset(lldbSectTypeToLlvmSectionKind(sect_type));
104 if (offsets) {
105 data.SetData(section_data, offsets->Offset, offsets->Length);
106 } else {
107 data.SetData(section_data, 0, section_data.GetByteSize());
108 }
109 return true;
110 }
111
LoadRawSectionData(lldb::SectionType sect_type,lldb_private::DWARFDataExtractor & data)112 bool SymbolFileDWARFDwp::LoadRawSectionData(
113 lldb::SectionType sect_type, lldb_private::DWARFDataExtractor &data) {
114 std::lock_guard<std::mutex> lock(m_sections_mutex);
115
116 auto it = m_sections.find(sect_type);
117 if (it != m_sections.end()) {
118 if (it->second.GetByteSize() == 0)
119 return false;
120
121 data = it->second;
122 return true;
123 }
124
125 const lldb_private::SectionList *section_list =
126 m_obj_file->GetSectionList(false /* update_module_section_list */);
127 if (section_list) {
128 lldb::SectionSP section_sp(
129 section_list->FindSectionByType(sect_type, true));
130 if (section_sp) {
131 if (m_obj_file->ReadSectionData(section_sp.get(), data) != 0) {
132 m_sections[sect_type] = data;
133 return true;
134 }
135 }
136 }
137 m_sections[sect_type].Clear();
138 return false;
139 }
140