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   // Only dwo files with 1 compile unit is supported
65   if (GetNumCompileUnits() == 1)
66     return DebugInfo()->GetCompileUnitAtIndex(0);
67   else
68     return nullptr;
69 }
70 
71 DWARFCompileUnit *
72 SymbolFileDWARFDwo::GetDWARFCompileUnit(lldb_private::CompileUnit *comp_unit) {
73   return GetCompileUnit();
74 }
75 
76 SymbolFileDWARF::DIEToTypePtr &SymbolFileDWARFDwo::GetDIEToType() {
77   return GetBaseSymbolFile()->GetDIEToType();
78 }
79 
80 SymbolFileDWARF::DIEToVariableSP &SymbolFileDWARFDwo::GetDIEToVariable() {
81   return GetBaseSymbolFile()->GetDIEToVariable();
82 }
83 
84 SymbolFileDWARF::DIEToClangType &
85 SymbolFileDWARFDwo::GetForwardDeclDieToClangType() {
86   return GetBaseSymbolFile()->GetForwardDeclDieToClangType();
87 }
88 
89 SymbolFileDWARF::ClangTypeToDIE &
90 SymbolFileDWARFDwo::GetForwardDeclClangTypeToDie() {
91   return GetBaseSymbolFile()->GetForwardDeclClangTypeToDie();
92 }
93 
94 UniqueDWARFASTTypeMap &SymbolFileDWARFDwo::GetUniqueDWARFASTTypeMap() {
95   return GetBaseSymbolFile()->GetUniqueDWARFASTTypeMap();
96 }
97 
98 lldb::TypeSP SymbolFileDWARFDwo::FindDefinitionTypeForDWARFDeclContext(
99     const DWARFDeclContext &die_decl_ctx) {
100   return GetBaseSymbolFile()->FindDefinitionTypeForDWARFDeclContext(
101       die_decl_ctx);
102 }
103 
104 SymbolFileDWARF *SymbolFileDWARFDwo::GetBaseSymbolFile() {
105   return m_base_dwarf_cu->GetSymbolFileDWARF();
106 }
107 
108 DWARFExpression::LocationListFormat
109 SymbolFileDWARFDwo::GetLocationListFormat() const {
110   return DWARFExpression::SplitDwarfLocationList;
111 }
112 
113 TypeSystem *
114 SymbolFileDWARFDwo::GetTypeSystemForLanguage(LanguageType language) {
115   return GetBaseSymbolFile()->GetTypeSystemForLanguage(language);
116 }
117 
118 DWARFDIE
119 SymbolFileDWARFDwo::GetDIE(const DIERef &die_ref) {
120   lldbassert(m_base_dwarf_cu->GetOffset() == die_ref.cu_offset);
121   return DebugInfo()->GetDIEForDIEOffset(die_ref.die_offset);
122 }
123