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