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[FreeBSD/FreeBSD.git] / contrib / llvm-project / lldb / source / Plugins / SymbolFile / Symtab / SymbolFileSymtab.cpp
1 //===-- SymbolFileSymtab.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 "SymbolFileSymtab.h"
10
11 #include "lldb/Core/Module.h"
12 #include "lldb/Core/PluginManager.h"
13 #include "lldb/Symbol/CompileUnit.h"
14 #include "lldb/Symbol/Function.h"
15 #include "lldb/Symbol/ObjectFile.h"
16 #include "lldb/Symbol/Symbol.h"
17 #include "lldb/Symbol/SymbolContext.h"
18 #include "lldb/Symbol/Symtab.h"
19 #include "lldb/Symbol/TypeList.h"
20 #include "lldb/Utility/RegularExpression.h"
21 #include "lldb/Utility/Timer.h"
22
23 #include <memory>
24
25 using namespace lldb;
26 using namespace lldb_private;
27
28 void SymbolFileSymtab::Initialize() {
29   PluginManager::RegisterPlugin(GetPluginNameStatic(),
30                                 GetPluginDescriptionStatic(), CreateInstance);
31 }
32
33 void SymbolFileSymtab::Terminate() {
34   PluginManager::UnregisterPlugin(CreateInstance);
35 }
36
37 lldb_private::ConstString SymbolFileSymtab::GetPluginNameStatic() {
38   static ConstString g_name("symtab");
39   return g_name;
40 }
41
42 const char *SymbolFileSymtab::GetPluginDescriptionStatic() {
43   return "Reads debug symbols from an object file's symbol table.";
44 }
45
46 SymbolFile *SymbolFileSymtab::CreateInstance(ObjectFileSP objfile_sp) {
47   return new SymbolFileSymtab(std::move(objfile_sp));
48 }
49
50 void SymbolFileSymtab::GetTypes(SymbolContextScope *sc_scope,
51                                 TypeClass type_mask,
52                                 lldb_private::TypeList &type_list) {}
53
54 SymbolFileSymtab::SymbolFileSymtab(ObjectFileSP objfile_sp)
55     : SymbolFile(std::move(objfile_sp)), m_source_indexes(), m_func_indexes(),
56       m_code_indexes(), m_objc_class_name_to_index() {}
57
58 SymbolFileSymtab::~SymbolFileSymtab() {}
59
60 uint32_t SymbolFileSymtab::CalculateAbilities() {
61   uint32_t abilities = 0;
62   if (m_objfile_sp) {
63     const Symtab *symtab = m_objfile_sp->GetSymtab();
64     if (symtab) {
65       // The snippet of code below will get the indexes the module symbol table
66       // entries that are code, data, or function related (debug info), sort
67       // them by value (address) and dump the sorted symbols.
68       if (symtab->AppendSymbolIndexesWithType(eSymbolTypeSourceFile,
69                                               m_source_indexes)) {
70         abilities |= CompileUnits;
71       }
72
73       if (symtab->AppendSymbolIndexesWithType(
74               eSymbolTypeCode, Symtab::eDebugYes, Symtab::eVisibilityAny,
75               m_func_indexes)) {
76         symtab->SortSymbolIndexesByValue(m_func_indexes, true);
77         abilities |= Functions;
78       }
79
80       if (symtab->AppendSymbolIndexesWithType(eSymbolTypeCode, Symtab::eDebugNo,
81                                               Symtab::eVisibilityAny,
82                                               m_code_indexes)) {
83         symtab->SortSymbolIndexesByValue(m_code_indexes, true);
84         abilities |= Functions;
85       }
86
87       if (symtab->AppendSymbolIndexesWithType(eSymbolTypeData,
88                                               m_data_indexes)) {
89         symtab->SortSymbolIndexesByValue(m_data_indexes, true);
90         abilities |= GlobalVariables;
91       }
92
93       lldb_private::Symtab::IndexCollection objc_class_indexes;
94       if (symtab->AppendSymbolIndexesWithType(eSymbolTypeObjCClass,
95                                               objc_class_indexes)) {
96         symtab->AppendSymbolNamesToMap(objc_class_indexes, true, true,
97                                        m_objc_class_name_to_index);
98         m_objc_class_name_to_index.Sort();
99       }
100     }
101   }
102   return abilities;
103 }
104
105 uint32_t SymbolFileSymtab::CalculateNumCompileUnits() {
106   // If we don't have any source file symbols we will just have one compile
107   // unit for the entire object file
108   if (m_source_indexes.empty())
109     return 0;
110
111   // If we have any source file symbols we will logically organize the object
112   // symbols using these.
113   return m_source_indexes.size();
114 }
115
116 CompUnitSP SymbolFileSymtab::ParseCompileUnitAtIndex(uint32_t idx) {
117   CompUnitSP cu_sp;
118
119   // If we don't have any source file symbols we will just have one compile
120   // unit for the entire object file
121   if (idx < m_source_indexes.size()) {
122     const Symbol *cu_symbol =
123         m_objfile_sp->GetSymtab()->SymbolAtIndex(m_source_indexes[idx]);
124     if (cu_symbol)
125       cu_sp = std::make_shared<CompileUnit>(m_objfile_sp->GetModule(), nullptr,
126                                             cu_symbol->GetName().AsCString(), 0,
127                                             eLanguageTypeUnknown, eLazyBoolNo);
128   }
129   return cu_sp;
130 }
131
132 lldb::LanguageType SymbolFileSymtab::ParseLanguage(CompileUnit &comp_unit) {
133   return eLanguageTypeUnknown;
134 }
135
136 size_t SymbolFileSymtab::ParseFunctions(CompileUnit &comp_unit) {
137   std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
138   size_t num_added = 0;
139   // We must at least have a valid compile unit
140   const Symtab *symtab = m_objfile_sp->GetSymtab();
141   const Symbol *curr_symbol = nullptr;
142   const Symbol *next_symbol = nullptr;
143   //  const char *prefix = m_objfile_sp->SymbolPrefix();
144   //  if (prefix == NULL)
145   //      prefix == "";
146   //
147   //  const uint32_t prefix_len = strlen(prefix);
148
149   // If we don't have any source file symbols we will just have one compile
150   // unit for the entire object file
151   if (m_source_indexes.empty()) {
152     // The only time we will have a user ID of zero is when we don't have and
153     // source file symbols and we declare one compile unit for the entire
154     // object file
155     if (!m_func_indexes.empty()) {
156     }
157
158     if (!m_code_indexes.empty()) {
159       //          StreamFile s(stdout);
160       //          symtab->Dump(&s, m_code_indexes);
161
162       uint32_t idx = 0; // Index into the indexes
163       const uint32_t num_indexes = m_code_indexes.size();
164       for (idx = 0; idx < num_indexes; ++idx) {
165         uint32_t symbol_idx = m_code_indexes[idx];
166         curr_symbol = symtab->SymbolAtIndex(symbol_idx);
167         if (curr_symbol) {
168           // Union of all ranges in the function DIE (if the function is
169           // discontiguous)
170           AddressRange func_range(curr_symbol->GetAddress(), 0);
171           if (func_range.GetBaseAddress().IsSectionOffset()) {
172             uint32_t symbol_size = curr_symbol->GetByteSize();
173             if (symbol_size != 0 && !curr_symbol->GetSizeIsSibling())
174               func_range.SetByteSize(symbol_size);
175             else if (idx + 1 < num_indexes) {
176               next_symbol = symtab->SymbolAtIndex(m_code_indexes[idx + 1]);
177               if (next_symbol) {
178                 func_range.SetByteSize(
179                     next_symbol->GetAddressRef().GetOffset() -
180                     curr_symbol->GetAddressRef().GetOffset());
181               }
182             }
183
184             FunctionSP func_sp(
185                 new Function(&comp_unit,
186                              symbol_idx,       // UserID is the DIE offset
187                              LLDB_INVALID_UID, // We don't have any type info
188                                                // for this function
189                              curr_symbol->GetMangled(), // Linker/mangled name
190                              nullptr, // no return type for a code symbol...
191                              func_range)); // first address range
192
193             if (func_sp.get() != nullptr) {
194               comp_unit.AddFunction(func_sp);
195               ++num_added;
196             }
197           }
198         }
199       }
200     }
201   } else {
202     // We assume we
203   }
204   return num_added;
205 }
206
207 size_t SymbolFileSymtab::ParseTypes(CompileUnit &comp_unit) { return 0; }
208
209 bool SymbolFileSymtab::ParseLineTable(CompileUnit &comp_unit) { return false; }
210
211 bool SymbolFileSymtab::ParseDebugMacros(CompileUnit &comp_unit) {
212   return false;
213 }
214
215 bool SymbolFileSymtab::ParseSupportFiles(CompileUnit &comp_unit,
216                                          FileSpecList &support_files) {
217   return false;
218 }
219
220 bool SymbolFileSymtab::ParseImportedModules(
221     const SymbolContext &sc, std::vector<SourceModule> &imported_modules) {
222   return false;
223 }
224
225 size_t SymbolFileSymtab::ParseBlocksRecursive(Function &func) { return 0; }
226
227 size_t SymbolFileSymtab::ParseVariablesForContext(const SymbolContext &sc) {
228   return 0;
229 }
230
231 Type *SymbolFileSymtab::ResolveTypeUID(lldb::user_id_t type_uid) {
232   return nullptr;
233 }
234
235 llvm::Optional<SymbolFile::ArrayInfo>
236 SymbolFileSymtab::GetDynamicArrayInfoForUID(
237     lldb::user_id_t type_uid, const lldb_private::ExecutionContext *exe_ctx) {
238   return llvm::None;
239 }
240
241 bool SymbolFileSymtab::CompleteType(lldb_private::CompilerType &compiler_type) {
242   return false;
243 }
244
245 uint32_t SymbolFileSymtab::ResolveSymbolContext(const Address &so_addr,
246                                                 SymbolContextItem resolve_scope,
247                                                 SymbolContext &sc) {
248   std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
249   if (m_objfile_sp->GetSymtab() == nullptr)
250     return 0;
251
252   uint32_t resolved_flags = 0;
253   if (resolve_scope & eSymbolContextSymbol) {
254     sc.symbol = m_objfile_sp->GetSymtab()->FindSymbolContainingFileAddress(
255         so_addr.GetFileAddress());
256     if (sc.symbol)
257       resolved_flags |= eSymbolContextSymbol;
258   }
259   return resolved_flags;
260 }
261
262 // PluginInterface protocol
263 lldb_private::ConstString SymbolFileSymtab::GetPluginName() {
264   return GetPluginNameStatic();
265 }
266
267 uint32_t SymbolFileSymtab::GetPluginVersion() { return 1; }