1 //===-- SymbolFileDWARFDwo.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 "SymbolFileDWARFDwo.h"
11 
12 #include "lldb/Core/Section.h"
13 #include "lldb/Expression/DWARFExpression.h"
14 #include "lldb/Symbol/ObjectFile.h"
15 #include "lldb/Utility/LLDBAssert.h"
16 
17 #include "DWARFCompileUnit.h"
18 #include "DWARFDebugInfo.h"
19 
20 using namespace lldb;
21 using namespace lldb_private;
22 
23 SymbolFileDWARFDwo::SymbolFileDWARFDwo(ObjectFileSP objfile,
24                                        DWARFCompileUnit *dwarf_cu)
25     : SymbolFileDWARF(objfile.get()), m_obj_file_sp(objfile),
26       m_base_dwarf_cu(dwarf_cu) {
27   SetID(((lldb::user_id_t)dwarf_cu->GetOffset()) << 32);
28 }
29 
30 void SymbolFileDWARFDwo::LoadSectionData(lldb::SectionType sect_type,
31                                          DWARFDataExtractor &data) {
32   const SectionList *section_list =
33       m_obj_file->GetSectionList(false /* update_module_section_list */);
34   if (section_list) {
35     SectionSP section_sp(section_list->FindSectionByType(sect_type, true));
36     if (section_sp) {
37       // See if we memory mapped the DWARF segment?
38       if (m_dwarf_data.GetByteSize()) {
39         data.SetData(m_dwarf_data, section_sp->GetOffset(),
40                      section_sp->GetFileSize());
41         return;
42       }
43 
44       if (m_obj_file->ReadSectionData(section_sp.get(), data) != 0)
45         return;
46 
47       data.Clear();
48     }
49   }
50 
51   SymbolFileDWARF::LoadSectionData(sect_type, data);
52 }
53 
54 lldb::CompUnitSP
55 SymbolFileDWARFDwo::ParseCompileUnit(DWARFCompileUnit *dwarf_cu,
56                                      uint32_t cu_idx) {
57   assert(GetCompileUnit() == dwarf_cu && "SymbolFileDWARFDwo::ParseCompileUnit "
58                                          "called with incompatible compile "
59                                          "unit");
60   return GetBaseSymbolFile()->ParseCompileUnit(m_base_dwarf_cu, UINT32_MAX);
61 }
62 
63 DWARFCompileUnit *SymbolFileDWARFDwo::GetCompileUnit() {
64   // A clang module is found via a skeleton CU, but is not a proper DWO.
65   // Clang modules have a .debug_info section instead of the *_dwo variant.
66   if (auto *section_list = m_obj_file->GetSectionList(false))
67     if (auto section_sp =
68             section_list->FindSectionByType(eSectionTypeDWARFDebugInfo, true))
69       if (!section_sp->GetName().GetStringRef().endswith("dwo"))
70         return nullptr;
71 
72   // Only dwo files with 1 compile unit is supported
73   if (GetNumCompileUnits() == 1)
74     return DebugInfo()->GetCompileUnitAtIndex(0);
75   else
76     return nullptr;
77 }
78 
79 DWARFCompileUnit *
80 SymbolFileDWARFDwo::GetDWARFCompileUnit(lldb_private::CompileUnit *comp_unit) {
81   return GetCompileUnit();
82 }
83 
84 SymbolFileDWARF::DIEToTypePtr &SymbolFileDWARFDwo::GetDIEToType() {
85   return GetBaseSymbolFile()->GetDIEToType();
86 }
87 
88 SymbolFileDWARF::DIEToVariableSP &SymbolFileDWARFDwo::GetDIEToVariable() {
89   return GetBaseSymbolFile()->GetDIEToVariable();
90 }
91 
92 SymbolFileDWARF::DIEToClangType &
93 SymbolFileDWARFDwo::GetForwardDeclDieToClangType() {
94   return GetBaseSymbolFile()->GetForwardDeclDieToClangType();
95 }
96 
97 SymbolFileDWARF::ClangTypeToDIE &
98 SymbolFileDWARFDwo::GetForwardDeclClangTypeToDie() {
99   return GetBaseSymbolFile()->GetForwardDeclClangTypeToDie();
100 }
101 
102 size_t SymbolFileDWARFDwo::GetObjCMethodDIEOffsets(
103     lldb_private::ConstString class_name, DIEArray &method_die_offsets) {
104   return GetBaseSymbolFile()->GetObjCMethodDIEOffsets(
105       class_name, method_die_offsets);
106 }
107 
108 UniqueDWARFASTTypeMap &SymbolFileDWARFDwo::GetUniqueDWARFASTTypeMap() {
109   return GetBaseSymbolFile()->GetUniqueDWARFASTTypeMap();
110 }
111 
112 lldb::TypeSP SymbolFileDWARFDwo::FindDefinitionTypeForDWARFDeclContext(
113     const DWARFDeclContext &die_decl_ctx) {
114   return GetBaseSymbolFile()->FindDefinitionTypeForDWARFDeclContext(
115       die_decl_ctx);
116 }
117 
118 lldb::TypeSP SymbolFileDWARFDwo::FindCompleteObjCDefinitionTypeForDIE(
119     const DWARFDIE &die, const lldb_private::ConstString &type_name,
120     bool must_be_implementation) {
121   return GetBaseSymbolFile()->FindCompleteObjCDefinitionTypeForDIE(
122       die, type_name, must_be_implementation);
123 }
124 
125 DWARFCompileUnit *SymbolFileDWARFDwo::GetBaseCompileUnit() {
126   return m_base_dwarf_cu;
127 }
128 
129 SymbolFileDWARF *SymbolFileDWARFDwo::GetBaseSymbolFile() {
130   return m_base_dwarf_cu->GetSymbolFileDWARF();
131 }
132 
133 DWARFExpression::LocationListFormat
134 SymbolFileDWARFDwo::GetLocationListFormat() const {
135   return DWARFExpression::SplitDwarfLocationList;
136 }
137 
138 TypeSystem *
139 SymbolFileDWARFDwo::GetTypeSystemForLanguage(LanguageType language) {
140   return GetBaseSymbolFile()->GetTypeSystemForLanguage(language);
141 }
142 
143 DWARFDIE
144 SymbolFileDWARFDwo::GetDIE(const DIERef &die_ref) {
145   lldbassert(m_base_dwarf_cu->GetOffset() == die_ref.cu_offset);
146   return DebugInfo()->GetDIEForDIEOffset(die_ref.die_offset);
147 }
148