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#include "llvm/Support/Casting.h"
16
17#include "DWARFCompileUnit.h"
18#include "DWARFDebugInfo.h"
19#include "DWARFUnit.h"
20
21using namespace lldb;
22using namespace lldb_private;
23
24char SymbolFileDWARFDwo::ID;
25
26SymbolFileDWARFDwo::SymbolFileDWARFDwo(ObjectFileSP objfile,
27                                       DWARFCompileUnit &dwarf_cu)
28    : SymbolFileDWARF(objfile, objfile->GetSectionList(
29                                   /*update_module_section_list*/ false)),
30      m_base_dwarf_cu(dwarf_cu) {
31  SetID(((lldb::user_id_t)dwarf_cu.GetID()) << 32);
32}
33
34void SymbolFileDWARFDwo::LoadSectionData(lldb::SectionType sect_type,
35                                         DWARFDataExtractor &data) {
36  const SectionList *section_list =
37      m_objfile_sp->GetSectionList(false /* update_module_section_list */);
38  if (section_list) {
39    SectionSP section_sp(section_list->FindSectionByType(sect_type, true));
40    if (section_sp) {
41
42      if (m_objfile_sp->ReadSectionData(section_sp.get(), data) != 0)
43        return;
44
45      data.Clear();
46    }
47  }
48
49  SymbolFileDWARF::LoadSectionData(sect_type, data);
50}
51
52lldb::CompUnitSP
53SymbolFileDWARFDwo::ParseCompileUnit(DWARFCompileUnit &dwarf_cu) {
54  assert(GetCompileUnit() == &dwarf_cu &&
55         "SymbolFileDWARFDwo::ParseCompileUnit called with incompatible "
56         "compile unit");
57  return GetBaseSymbolFile().ParseCompileUnit(m_base_dwarf_cu);
58}
59
60DWARFCompileUnit *SymbolFileDWARFDwo::GetCompileUnit() {
61  if (!m_cu)
62    m_cu = ComputeCompileUnit();
63  return m_cu;
64}
65
66DWARFCompileUnit *SymbolFileDWARFDwo::ComputeCompileUnit() {
67  DWARFDebugInfo *debug_info = DebugInfo();
68  if (!debug_info)
69    return nullptr;
70
71  // Right now we only support dwo files with one compile unit. If we don't have
72  // type units, we can just check for the unit count.
73  if (!debug_info->ContainsTypeUnits() && debug_info->GetNumUnits() == 1)
74    return llvm::cast<DWARFCompileUnit>(debug_info->GetUnitAtIndex(0));
75
76  // Otherwise, we have to run through all units, and find the compile unit that
77  // way.
78  DWARFCompileUnit *cu = nullptr;
79  for (size_t i = 0; i < debug_info->GetNumUnits(); ++i) {
80    if (auto *candidate =
81            llvm::dyn_cast<DWARFCompileUnit>(debug_info->GetUnitAtIndex(i))) {
82      if (cu)
83        return nullptr; // More that one CU found.
84      cu = candidate;
85    }
86  }
87  return cu;
88}
89
90DWARFUnit *
91SymbolFileDWARFDwo::GetDWARFCompileUnit(lldb_private::CompileUnit *comp_unit) {
92  return GetCompileUnit();
93}
94
95SymbolFileDWARF::DIEToTypePtr &SymbolFileDWARFDwo::GetDIEToType() {
96  return GetBaseSymbolFile().GetDIEToType();
97}
98
99SymbolFileDWARF::DIEToVariableSP &SymbolFileDWARFDwo::GetDIEToVariable() {
100  return GetBaseSymbolFile().GetDIEToVariable();
101}
102
103SymbolFileDWARF::DIEToClangType &
104SymbolFileDWARFDwo::GetForwardDeclDieToClangType() {
105  return GetBaseSymbolFile().GetForwardDeclDieToClangType();
106}
107
108SymbolFileDWARF::ClangTypeToDIE &
109SymbolFileDWARFDwo::GetForwardDeclClangTypeToDie() {
110  return GetBaseSymbolFile().GetForwardDeclClangTypeToDie();
111}
112
113size_t SymbolFileDWARFDwo::GetObjCMethodDIEOffsets(
114    lldb_private::ConstString class_name, DIEArray &method_die_offsets) {
115  return GetBaseSymbolFile().GetObjCMethodDIEOffsets(class_name,
116                                                     method_die_offsets);
117}
118
119UniqueDWARFASTTypeMap &SymbolFileDWARFDwo::GetUniqueDWARFASTTypeMap() {
120  return GetBaseSymbolFile().GetUniqueDWARFASTTypeMap();
121}
122
123lldb::TypeSP SymbolFileDWARFDwo::FindDefinitionTypeForDWARFDeclContext(
124    const DWARFDeclContext &die_decl_ctx) {
125  return GetBaseSymbolFile().FindDefinitionTypeForDWARFDeclContext(
126      die_decl_ctx);
127}
128
129lldb::TypeSP SymbolFileDWARFDwo::FindCompleteObjCDefinitionTypeForDIE(
130    const DWARFDIE &die, lldb_private::ConstString type_name,
131    bool must_be_implementation) {
132  return GetBaseSymbolFile().FindCompleteObjCDefinitionTypeForDIE(
133      die, type_name, must_be_implementation);
134}
135
136SymbolFileDWARF &SymbolFileDWARFDwo::GetBaseSymbolFile() {
137  return m_base_dwarf_cu.GetSymbolFileDWARF();
138}
139
140llvm::Expected<TypeSystem &>
141SymbolFileDWARFDwo::GetTypeSystemForLanguage(LanguageType language) {
142  return GetBaseSymbolFile().GetTypeSystemForLanguage(language);
143}
144
145DWARFDIE
146SymbolFileDWARFDwo::GetDIE(const DIERef &die_ref) {
147  if (*die_ref.dwo_num() == GetDwoNum())
148    return DebugInfo()->GetDIE(die_ref);
149  return GetBaseSymbolFile().GetDIE(die_ref);
150}
151