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 §ion) { 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 §ion : *m_main_section_list) 139 AddSection(*section); 140 } 141 142 if (m_dwo_section_list) { 143 for (auto §ion : *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 } 151