1 //===-- SymbolFileDWARFDwo.cpp ----------------------------------*- C++ -*-===//
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 "SymbolFileDWARFDwo.h"
10 
11 #include "lldb/Core/Section.h"
12 #include "lldb/Expression/DWARFExpression.h"
13 #include "lldb/Symbol/ObjectFile.h"
14 #include "lldb/Utility/LLDBAssert.h"
15 
16 #include "DWARFUnit.h"
17 #include "DWARFDebugInfo.h"
18 
19 using namespace lldb;
20 using namespace lldb_private;
21 
22 SymbolFileDWARFDwo::SymbolFileDWARFDwo(ObjectFileSP objfile,
23                                        DWARFUnit *dwarf_cu)
24     : SymbolFileDWARF(objfile.get()), m_obj_file_sp(objfile),
25       m_base_dwarf_cu(dwarf_cu) {
26   SetID(((lldb::user_id_t)dwarf_cu->GetID()) << 32);
27 }
28 
29 void SymbolFileDWARFDwo::LoadSectionData(lldb::SectionType sect_type,
30                                          DWARFDataExtractor &data) {
31   const SectionList *section_list =
32       m_obj_file->GetSectionList(false /* update_module_section_list */);
33   if (section_list) {
34     SectionSP section_sp(section_list->FindSectionByType(sect_type, true));
35     if (section_sp) {
36 
37       if (m_obj_file->ReadSectionData(section_sp.get(), data) != 0)
38         return;
39 
40       data.Clear();
41     }
42   }
43 
44   SymbolFileDWARF::LoadSectionData(sect_type, data);
45 }
46 
47 lldb::CompUnitSP
48 SymbolFileDWARFDwo::ParseCompileUnit(DWARFUnit *dwarf_cu,
49                                      uint32_t cu_idx) {
50   assert(GetCompileUnit() == dwarf_cu && "SymbolFileDWARFDwo::ParseCompileUnit "
51                                          "called with incompatible compile "
52                                          "unit");
53   return GetBaseSymbolFile()->ParseCompileUnit(m_base_dwarf_cu, UINT32_MAX);
54 }
55 
56 DWARFUnit *SymbolFileDWARFDwo::GetCompileUnit() {
57   // Only dwo files with 1 compile unit is supported
58   if (GetNumCompileUnits() == 1)
59     return DebugInfo()->GetUnitAtIndex(0);
60   else
61     return nullptr;
62 }
63 
64 DWARFUnit *
65 SymbolFileDWARFDwo::GetDWARFCompileUnit(lldb_private::CompileUnit *comp_unit) {
66   return GetCompileUnit();
67 }
68 
69 SymbolFileDWARF::DIEToTypePtr &SymbolFileDWARFDwo::GetDIEToType() {
70   return GetBaseSymbolFile()->GetDIEToType();
71 }
72 
73 SymbolFileDWARF::DIEToVariableSP &SymbolFileDWARFDwo::GetDIEToVariable() {
74   return GetBaseSymbolFile()->GetDIEToVariable();
75 }
76 
77 SymbolFileDWARF::DIEToClangType &
78 SymbolFileDWARFDwo::GetForwardDeclDieToClangType() {
79   return GetBaseSymbolFile()->GetForwardDeclDieToClangType();
80 }
81 
82 SymbolFileDWARF::ClangTypeToDIE &
83 SymbolFileDWARFDwo::GetForwardDeclClangTypeToDie() {
84   return GetBaseSymbolFile()->GetForwardDeclClangTypeToDie();
85 }
86 
87 size_t SymbolFileDWARFDwo::GetObjCMethodDIEOffsets(
88     lldb_private::ConstString class_name, DIEArray &method_die_offsets) {
89   return GetBaseSymbolFile()->GetObjCMethodDIEOffsets(
90       class_name, method_die_offsets);
91 }
92 
93 UniqueDWARFASTTypeMap &SymbolFileDWARFDwo::GetUniqueDWARFASTTypeMap() {
94   return GetBaseSymbolFile()->GetUniqueDWARFASTTypeMap();
95 }
96 
97 lldb::TypeSP SymbolFileDWARFDwo::FindDefinitionTypeForDWARFDeclContext(
98     const DWARFDeclContext &die_decl_ctx) {
99   return GetBaseSymbolFile()->FindDefinitionTypeForDWARFDeclContext(
100       die_decl_ctx);
101 }
102 
103 lldb::TypeSP SymbolFileDWARFDwo::FindCompleteObjCDefinitionTypeForDIE(
104     const DWARFDIE &die, lldb_private::ConstString type_name,
105     bool must_be_implementation) {
106   return GetBaseSymbolFile()->FindCompleteObjCDefinitionTypeForDIE(
107       die, type_name, must_be_implementation);
108 }
109 
110 DWARFUnit *SymbolFileDWARFDwo::GetBaseCompileUnit() {
111   return m_base_dwarf_cu;
112 }
113 
114 const DWARFDataExtractor &SymbolFileDWARFDwo::get_debug_abbrev_data() {
115   return GetCachedSectionData(eSectionTypeDWARFDebugAbbrevDwo,
116                               m_data_debug_abbrev);
117 }
118 
119 const DWARFDataExtractor &SymbolFileDWARFDwo::get_debug_addr_data() {
120   // For single file split dwarf case (when we have .dwo sections in a .o),
121   // we do not want to use the .debug_addr section from .o file,
122   // but want to get one from the final executable.
123   // For regular split debug case, .dwo file does not contain the
124   // .debug_addr, so we would always fall back to such lookup anyways.
125   llvm::call_once(m_data_debug_addr.m_flag, [this] {
126     SymbolFileDWARF::LoadSectionData(eSectionTypeDWARFDebugAddr,
127                                      std::ref(m_data_debug_addr.m_data));
128   });
129   return m_data_debug_addr.m_data;
130 }
131 
132 const DWARFDataExtractor &SymbolFileDWARFDwo::get_debug_info_data() {
133   return GetCachedSectionData(eSectionTypeDWARFDebugInfoDwo, m_data_debug_info);
134 }
135 
136 const DWARFDataExtractor &SymbolFileDWARFDwo::get_debug_str_data() {
137   return GetCachedSectionData(eSectionTypeDWARFDebugStrDwo, m_data_debug_str);
138 }
139 
140 const DWARFDataExtractor &SymbolFileDWARFDwo::get_debug_str_offsets_data() {
141   return GetCachedSectionData(eSectionTypeDWARFDebugStrOffsetsDwo,
142                               m_data_debug_str_offsets);
143 }
144 
145 SymbolFileDWARF *SymbolFileDWARFDwo::GetBaseSymbolFile() {
146   return m_base_dwarf_cu->GetSymbolFileDWARF();
147 }
148 
149 DWARFExpression::LocationListFormat
150 SymbolFileDWARFDwo::GetLocationListFormat() const {
151   return DWARFExpression::SplitDwarfLocationList;
152 }
153 
154 TypeSystem *
155 SymbolFileDWARFDwo::GetTypeSystemForLanguage(LanguageType language) {
156   return GetBaseSymbolFile()->GetTypeSystemForLanguage(language);
157 }
158 
159 DWARFDIE
160 SymbolFileDWARFDwo::GetDIE(const DIERef &die_ref) {
161   lldbassert(die_ref.cu_offset == m_base_dwarf_cu->GetOffset() ||
162              die_ref.cu_offset == DW_INVALID_OFFSET);
163   return DebugInfo()->GetDIEForDIEOffset(die_ref.section, die_ref.die_offset);
164 }
165