1 //===-- SymbolFileDWARFDwo.cpp --------------------------------------------===//
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 #include <optional>
21
22 using namespace lldb;
23 using namespace lldb_private;
24
25 char SymbolFileDWARFDwo::ID;
26
SymbolFileDWARFDwo(SymbolFileDWARF & base_symbol_file,ObjectFileSP objfile,uint32_t id)27 SymbolFileDWARFDwo::SymbolFileDWARFDwo(SymbolFileDWARF &base_symbol_file,
28 ObjectFileSP objfile, uint32_t id)
29 : SymbolFileDWARF(objfile, objfile->GetSectionList(
30 /*update_module_section_list*/ false)),
31 m_base_symbol_file(base_symbol_file) {
32 SetID(user_id_t(id) << 32);
33
34 // Parsing of the dwarf unit index is not thread-safe, so we need to prime it
35 // to enable subsequent concurrent lookups.
36 m_context.GetAsLLVM().getCUIndex();
37 }
38
GetDWOCompileUnitForHash(uint64_t hash)39 DWARFCompileUnit *SymbolFileDWARFDwo::GetDWOCompileUnitForHash(uint64_t hash) {
40 if (const llvm::DWARFUnitIndex &index = m_context.GetAsLLVM().getCUIndex()) {
41 if (const llvm::DWARFUnitIndex::Entry *entry = index.getFromHash(hash)) {
42 if (auto *unit_contrib = entry->getContribution())
43 return llvm::dyn_cast_or_null<DWARFCompileUnit>(
44 DebugInfo().GetUnitAtOffset(DIERef::Section::DebugInfo,
45 unit_contrib->getOffset32()));
46 }
47 return nullptr;
48 }
49
50 DWARFCompileUnit *cu = FindSingleCompileUnit();
51 if (!cu)
52 return nullptr;
53 std::optional<uint64_t> dwo_id = cu->GetDWOId();
54 if (!dwo_id || hash != *dwo_id)
55 return nullptr;
56 return cu;
57 }
58
FindSingleCompileUnit()59 DWARFCompileUnit *SymbolFileDWARFDwo::FindSingleCompileUnit() {
60 DWARFDebugInfo &debug_info = DebugInfo();
61
62 // Right now we only support dwo files with one compile unit. If we don't have
63 // type units, we can just check for the unit count.
64 if (!debug_info.ContainsTypeUnits() && debug_info.GetNumUnits() == 1)
65 return llvm::cast<DWARFCompileUnit>(debug_info.GetUnitAtIndex(0));
66
67 // Otherwise, we have to run through all units, and find the compile unit that
68 // way.
69 DWARFCompileUnit *cu = nullptr;
70 for (size_t i = 0; i < debug_info.GetNumUnits(); ++i) {
71 if (auto *candidate =
72 llvm::dyn_cast<DWARFCompileUnit>(debug_info.GetUnitAtIndex(i))) {
73 if (cu)
74 return nullptr; // More that one CU found.
75 cu = candidate;
76 }
77 }
78 return cu;
79 }
80
GetVendorDWARFOpcodeSize(const lldb_private::DataExtractor & data,const lldb::offset_t data_offset,const uint8_t op) const81 lldb::offset_t SymbolFileDWARFDwo::GetVendorDWARFOpcodeSize(
82 const lldb_private::DataExtractor &data, const lldb::offset_t data_offset,
83 const uint8_t op) const {
84 return GetBaseSymbolFile().GetVendorDWARFOpcodeSize(data, data_offset, op);
85 }
86
ParseVendorDWARFOpcode(uint8_t op,const lldb_private::DataExtractor & opcodes,lldb::offset_t & offset,std::vector<lldb_private::Value> & stack) const87 bool SymbolFileDWARFDwo::ParseVendorDWARFOpcode(
88 uint8_t op, const lldb_private::DataExtractor &opcodes,
89 lldb::offset_t &offset, std::vector<lldb_private::Value> &stack) const {
90 return GetBaseSymbolFile().ParseVendorDWARFOpcode(op, opcodes, offset, stack);
91 }
92
GetDIEToType()93 SymbolFileDWARF::DIEToTypePtr &SymbolFileDWARFDwo::GetDIEToType() {
94 return GetBaseSymbolFile().GetDIEToType();
95 }
96
GetDIEToVariable()97 SymbolFileDWARF::DIEToVariableSP &SymbolFileDWARFDwo::GetDIEToVariable() {
98 return GetBaseSymbolFile().GetDIEToVariable();
99 }
100
101 SymbolFileDWARF::DIEToClangType &
GetForwardDeclDieToClangType()102 SymbolFileDWARFDwo::GetForwardDeclDieToClangType() {
103 return GetBaseSymbolFile().GetForwardDeclDieToClangType();
104 }
105
106 SymbolFileDWARF::ClangTypeToDIE &
GetForwardDeclClangTypeToDie()107 SymbolFileDWARFDwo::GetForwardDeclClangTypeToDie() {
108 return GetBaseSymbolFile().GetForwardDeclClangTypeToDie();
109 }
110
GetObjCMethods(lldb_private::ConstString class_name,llvm::function_ref<bool (DWARFDIE die)> callback)111 void SymbolFileDWARFDwo::GetObjCMethods(
112 lldb_private::ConstString class_name,
113 llvm::function_ref<bool(DWARFDIE die)> callback) {
114 GetBaseSymbolFile().GetObjCMethods(class_name, callback);
115 }
116
GetUniqueDWARFASTTypeMap()117 UniqueDWARFASTTypeMap &SymbolFileDWARFDwo::GetUniqueDWARFASTTypeMap() {
118 return GetBaseSymbolFile().GetUniqueDWARFASTTypeMap();
119 }
120
121 lldb::TypeSP
FindDefinitionTypeForDWARFDeclContext(const DWARFDIE & die)122 SymbolFileDWARFDwo::FindDefinitionTypeForDWARFDeclContext(const DWARFDIE &die) {
123 return GetBaseSymbolFile().FindDefinitionTypeForDWARFDeclContext(die);
124 }
125
FindCompleteObjCDefinitionTypeForDIE(const DWARFDIE & die,lldb_private::ConstString type_name,bool must_be_implementation)126 lldb::TypeSP SymbolFileDWARFDwo::FindCompleteObjCDefinitionTypeForDIE(
127 const DWARFDIE &die, lldb_private::ConstString type_name,
128 bool must_be_implementation) {
129 return GetBaseSymbolFile().FindCompleteObjCDefinitionTypeForDIE(
130 die, type_name, must_be_implementation);
131 }
132
133 llvm::Expected<lldb::TypeSystemSP>
GetTypeSystemForLanguage(LanguageType language)134 SymbolFileDWARFDwo::GetTypeSystemForLanguage(LanguageType language) {
135 return GetBaseSymbolFile().GetTypeSystemForLanguage(language);
136 }
137
138 DWARFDIE
GetDIE(const DIERef & die_ref)139 SymbolFileDWARFDwo::GetDIE(const DIERef &die_ref) {
140 if (die_ref.dwo_num() == GetDwoNum())
141 return DebugInfo().GetDIE(die_ref);
142 return GetBaseSymbolFile().GetDIE(die_ref);
143 }
144