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

   1 //===-- DWARFContext.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 "DWARFContext.h"
  10
  11 #include "lldb/Core/Section.h"
  12
  13 using namespace lldb;
  14 using namespace lldb_private;
  15
  16 static DWARFDataExtractor LoadSection(SectionList *section_list,
  17                                       SectionType section_type) {
  18   if (!section_list)
  19     return DWARFDataExtractor();
  20
  21   auto section_sp = section_list->FindSectionByType(section_type, true);
  22   if (!section_sp)
  23     return DWARFDataExtractor();
  24
  25   DWARFDataExtractor data;
  26   section_sp->GetSectionData(data);
  27   return data;
  28 }
  29
  30 const DWARFDataExtractor &
  31 DWARFContext::LoadOrGetSection(SectionType main_section_type,
  32                                llvm::Optional<SectionType> dwo_section_type,
  33                                SectionData &data) {
  34   llvm::call_once(data.flag, [&] {
  35     if (dwo_section_type && isDwo())
  36       data.data = LoadSection(m_dwo_section_list, *dwo_section_type);
  37     else
  38       data.data = LoadSection(m_main_section_list, main_section_type);
  39   });
  40   return data.data;
  41 }
  42
  43 const DWARFDataExtractor &DWARFContext::getOrLoadAbbrevData() {
  44   return LoadOrGetSection(eSectionTypeDWARFDebugAbbrev,
  45                           eSectionTypeDWARFDebugAbbrevDwo, m_data_debug_abbrev);
  46 }
  47
  48 const DWARFDataExtractor &DWARFContext::getOrLoadArangesData() {
  49   return LoadOrGetSection(eSectionTypeDWARFDebugAranges, llvm::None,
  50                           m_data_debug_aranges);
  51 }
  52
  53 const DWARFDataExtractor &DWARFContext::getOrLoadAddrData() {
  54   return LoadOrGetSection(eSectionTypeDWARFDebugAddr, llvm::None,
  55                           m_data_debug_addr);
  56 }
  57
  58 const DWARFDataExtractor &DWARFContext::getOrLoadDebugInfoData() {
  59   return LoadOrGetSection(eSectionTypeDWARFDebugInfo,
  60                           eSectionTypeDWARFDebugInfoDwo, m_data_debug_info);
  61 }
  62
  63 const DWARFDataExtractor &DWARFContext::getOrLoadLineData() {
  64   return LoadOrGetSection(eSectionTypeDWARFDebugLine, llvm::None,
  65                           m_data_debug_line);
  66 }
  67
  68 const DWARFDataExtractor &DWARFContext::getOrLoadLineStrData() {
  69   return LoadOrGetSection(eSectionTypeDWARFDebugLineStr, llvm::None,
  70                           m_data_debug_line_str);
  71 }
  72
  73 const DWARFDataExtractor &DWARFContext::getOrLoadLocData() {
  74   return LoadOrGetSection(eSectionTypeDWARFDebugLoc,
  75                           eSectionTypeDWARFDebugLocDwo, m_data_debug_loc);
  76 }
  77
  78 const DWARFDataExtractor &DWARFContext::getOrLoadLocListsData() {
  79   return LoadOrGetSection(eSectionTypeDWARFDebugLocLists,
  80                           eSectionTypeDWARFDebugLocListsDwo,
  81                           m_data_debug_loclists);
  82 }
  83
  84 const DWARFDataExtractor &DWARFContext::getOrLoadMacroData() {
  85   return LoadOrGetSection(eSectionTypeDWARFDebugMacro, llvm::None,
  86                           m_data_debug_macro);
  87 }
  88
  89 const DWARFDataExtractor &DWARFContext::getOrLoadRangesData() {
  90   return LoadOrGetSection(eSectionTypeDWARFDebugRanges, llvm::None,
  91                           m_data_debug_ranges);
  92 }
  93
  94 const DWARFDataExtractor &DWARFContext::getOrLoadRngListsData() {
  95   return LoadOrGetSection(eSectionTypeDWARFDebugRngLists,
  96                           eSectionTypeDWARFDebugRngListsDwo,
  97                           m_data_debug_rnglists);
  98 }
  99
 100 const DWARFDataExtractor &DWARFContext::getOrLoadStrData() {
 101   return LoadOrGetSection(eSectionTypeDWARFDebugStr,
 102                           eSectionTypeDWARFDebugStrDwo, m_data_debug_str);
 103 }
 104
 105 const DWARFDataExtractor &DWARFContext::getOrLoadStrOffsetsData() {
 106   return LoadOrGetSection(eSectionTypeDWARFDebugStrOffsets,
 107                           eSectionTypeDWARFDebugStrOffsetsDwo,
 108                           m_data_debug_str_offsets);
 109 }
 110
 111 const DWARFDataExtractor &DWARFContext::getOrLoadDebugTypesData() {
 112   return LoadOrGetSection(eSectionTypeDWARFDebugTypes,
 113                           eSectionTypeDWARFDebugTypesDwo, m_data_debug_types);
 114 }
 115
 116 llvm::DWARFContext &DWARFContext::GetAsLLVM() {
 117   if (!m_llvm_context) {
 118     llvm::StringMap<std::unique_ptr<llvm::MemoryBuffer>> section_map;
 119     uint8_t addr_size = 0;
 120
 121     auto AddSection = [&](Section &section) {
 122       DataExtractor section_data;
 123       section.GetSectionData(section_data);
 124
 125       // Set the address size the first time we see it.
 126       if (addr_size == 0)
 127         addr_size = section_data.GetByteSize();
 128
 129       llvm::StringRef data = llvm::toStringRef(section_data.GetData());
 130       llvm::StringRef name = section.GetName().GetStringRef();
 131       if (name.startswith("."))
 132         name = name.drop_front();
 133       section_map.try_emplace(
 134           name, llvm::MemoryBuffer::getMemBuffer(data, name, false));
 135     };
 136
 137     if (m_main_section_list) {
 138       for (auto &section : *m_main_section_list)
 139         AddSection(*section);
 140     }
 141
 142     if (m_dwo_section_list) {
 143       for (auto &section : *m_dwo_section_list)
 144         AddSection(*section);
 145     }
 146
 147     m_llvm_context = llvm::DWARFContext::create(section_map, addr_size);
 148   }
 149   return *m_llvm_context;
 150 }