SymbolFileDWARFDwo.cpp revision 327952 
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
20using namespace lldb;
21using namespace lldb_private;
22
23SymbolFileDWARFDwo::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
30void 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
54lldb::CompUnitSP
55SymbolFileDWARFDwo::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
63DWARFCompileUnit *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
79DWARFCompileUnit *
80SymbolFileDWARFDwo::GetDWARFCompileUnit(lldb_private::CompileUnit *comp_unit) {
81  return GetCompileUnit();
82}
83
84SymbolFileDWARF::DIEToTypePtr &SymbolFileDWARFDwo::GetDIEToType() {
85  return GetBaseSymbolFile()->GetDIEToType();
86}
87
88SymbolFileDWARF::DIEToVariableSP &SymbolFileDWARFDwo::GetDIEToVariable() {
89  return GetBaseSymbolFile()->GetDIEToVariable();
90}
91
92SymbolFileDWARF::DIEToClangType &
93SymbolFileDWARFDwo::GetForwardDeclDieToClangType() {
94  return GetBaseSymbolFile()->GetForwardDeclDieToClangType();
95}
96
97SymbolFileDWARF::ClangTypeToDIE &
98SymbolFileDWARFDwo::GetForwardDeclClangTypeToDie() {
99  return GetBaseSymbolFile()->GetForwardDeclClangTypeToDie();
100}
101
102size_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
108UniqueDWARFASTTypeMap &SymbolFileDWARFDwo::GetUniqueDWARFASTTypeMap() {
109  return GetBaseSymbolFile()->GetUniqueDWARFASTTypeMap();
110}
111
112lldb::TypeSP SymbolFileDWARFDwo::FindDefinitionTypeForDWARFDeclContext(
113    const DWARFDeclContext &die_decl_ctx) {
114  return GetBaseSymbolFile()->FindDefinitionTypeForDWARFDeclContext(
115      die_decl_ctx);
116}
117
118lldb::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
125DWARFCompileUnit *SymbolFileDWARFDwo::GetBaseCompileUnit() {
126  return m_base_dwarf_cu;
127}
128
129SymbolFileDWARF *SymbolFileDWARFDwo::GetBaseSymbolFile() {
130  return m_base_dwarf_cu->GetSymbolFileDWARF();
131}
132
133DWARFExpression::LocationListFormat
134SymbolFileDWARFDwo::GetLocationListFormat() const {
135  return DWARFExpression::SplitDwarfLocationList;
136}
137
138TypeSystem *
139SymbolFileDWARFDwo::GetTypeSystemForLanguage(LanguageType language) {
140  return GetBaseSymbolFile()->GetTypeSystemForLanguage(language);
141}
142
143DWARFDIE
144SymbolFileDWARFDwo::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