contrib/llvm-project/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDwo.cpp

   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
  21 using namespace lldb;
  22 using namespace lldb_private;
  23
  24 SymbolFileDWARFDwo::SymbolFileDWARFDwo(ObjectFileSP objfile,
  25                                        DWARFCompileUnit &dwarf_cu)
  26     : SymbolFileDWARF(objfile.get(), objfile->GetSectionList(
  27                                          /*update_module_section_list*/ false)),
  28       m_obj_file_sp(objfile), m_base_dwarf_cu(dwarf_cu) {
  29   SetID(((lldb::user_id_t)dwarf_cu.GetID()) << 32);
  30 }
  31
  32 void SymbolFileDWARFDwo::LoadSectionData(lldb::SectionType sect_type,
  33                                          DWARFDataExtractor &data) {
  34   const SectionList *section_list =
  35       m_obj_file->GetSectionList(false /* update_module_section_list */);
  36   if (section_list) {
  37     SectionSP section_sp(section_list->FindSectionByType(sect_type, true));
  38     if (section_sp) {
  39
  40       if (m_obj_file->ReadSectionData(section_sp.get(), data) != 0)
  41         return;
  42
  43       data.Clear();
  44     }
  45   }
  46
  47   SymbolFileDWARF::LoadSectionData(sect_type, data);
  48 }
  49
  50 lldb::CompUnitSP
  51 SymbolFileDWARFDwo::ParseCompileUnit(DWARFCompileUnit &dwarf_cu) {
  52   assert(GetCompileUnit() == &dwarf_cu &&
  53          "SymbolFileDWARFDwo::ParseCompileUnit called with incompatible "
  54          "compile unit");
  55   return GetBaseSymbolFile().ParseCompileUnit(m_base_dwarf_cu);
  56 }
  57
  58 DWARFCompileUnit *SymbolFileDWARFDwo::GetCompileUnit() {
  59   if (!m_cu)
  60     m_cu = ComputeCompileUnit();
  61   return m_cu;
  62 }
  63
  64 DWARFCompileUnit *SymbolFileDWARFDwo::ComputeCompileUnit() {
  65   DWARFDebugInfo *debug_info = DebugInfo();
  66   if (!debug_info)
  67     return nullptr;
  68
  69   // Right now we only support dwo files with one compile unit. If we don't have
  70   // type units, we can just check for the unit count.
  71   if (!debug_info->ContainsTypeUnits() && debug_info->GetNumUnits() == 1)
  72     return llvm::cast<DWARFCompileUnit>(debug_info->GetUnitAtIndex(0));
  73
  74   // Otherwise, we have to run through all units, and find the compile unit that
  75   // way.
  76   DWARFCompileUnit *cu = nullptr;
  77   for (size_t i = 0; i < debug_info->GetNumUnits(); ++i) {
  78     if (auto *candidate =
  79             llvm::dyn_cast<DWARFCompileUnit>(debug_info->GetUnitAtIndex(i))) {
  80       if (cu)
  81         return nullptr; // More that one CU found.
  82       cu = candidate;
  83     }
  84   }
  85   return cu;
  86 }
  87
  88 DWARFUnit *
  89 SymbolFileDWARFDwo::GetDWARFCompileUnit(lldb_private::CompileUnit *comp_unit) {
  90   return GetCompileUnit();
  91 }
  92
  93 SymbolFileDWARF::DIEToTypePtr &SymbolFileDWARFDwo::GetDIEToType() {
  94   return GetBaseSymbolFile().GetDIEToType();
  95 }
  96
  97 SymbolFileDWARF::DIEToVariableSP &SymbolFileDWARFDwo::GetDIEToVariable() {
  98   return GetBaseSymbolFile().GetDIEToVariable();
  99 }
 100
 101 SymbolFileDWARF::DIEToClangType &
 102 SymbolFileDWARFDwo::GetForwardDeclDieToClangType() {
 103   return GetBaseSymbolFile().GetForwardDeclDieToClangType();
 104 }
 105
 106 SymbolFileDWARF::ClangTypeToDIE &
 107 SymbolFileDWARFDwo::GetForwardDeclClangTypeToDie() {
 108   return GetBaseSymbolFile().GetForwardDeclClangTypeToDie();
 109 }
 110
 111 size_t SymbolFileDWARFDwo::GetObjCMethodDIEOffsets(
 112     lldb_private::ConstString class_name, DIEArray &method_die_offsets) {
 113   return GetBaseSymbolFile().GetObjCMethodDIEOffsets(class_name,
 114                                                      method_die_offsets);
 115 }
 116
 117 UniqueDWARFASTTypeMap &SymbolFileDWARFDwo::GetUniqueDWARFASTTypeMap() {
 118   return GetBaseSymbolFile().GetUniqueDWARFASTTypeMap();
 119 }
 120
 121 lldb::TypeSP SymbolFileDWARFDwo::FindDefinitionTypeForDWARFDeclContext(
 122     const DWARFDeclContext &die_decl_ctx) {
 123   return GetBaseSymbolFile().FindDefinitionTypeForDWARFDeclContext(
 124       die_decl_ctx);
 125 }
 126
 127 lldb::TypeSP SymbolFileDWARFDwo::FindCompleteObjCDefinitionTypeForDIE(
 128     const DWARFDIE &die, lldb_private::ConstString type_name,
 129     bool must_be_implementation) {
 130   return GetBaseSymbolFile().FindCompleteObjCDefinitionTypeForDIE(
 131       die, type_name, must_be_implementation);
 132 }
 133
 134 SymbolFileDWARF &SymbolFileDWARFDwo::GetBaseSymbolFile() {
 135   return m_base_dwarf_cu.GetSymbolFileDWARF();
 136 }
 137
 138 DWARFExpression::LocationListFormat
 139 SymbolFileDWARFDwo::GetLocationListFormat() const {
 140   return DWARFExpression::SplitDwarfLocationList;
 141 }
 142
 143 TypeSystem *
 144 SymbolFileDWARFDwo::GetTypeSystemForLanguage(LanguageType language) {
 145   return GetBaseSymbolFile().GetTypeSystemForLanguage(language);
 146 }
 147
 148 DWARFDIE
 149 SymbolFileDWARFDwo::GetDIE(const DIERef &die_ref) {
 150   if (*die_ref.dwo_num() == GetDwoNum())
 151     return DebugInfo()->GetDIE(die_ref);
 152   return GetBaseSymbolFile().GetDIE(die_ref);
 153 }