| 1 | // readsyms.h -- read input file symbols for gold -*- C++ -*- |
| 2 | |
| 3 | // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. |
| 4 | // Written by Ian Lance Taylor <iant@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #ifndef GOLD_READSYMS_H |
| 24 | #define GOLD_READSYMS_H |
| 25 | |
| 26 | #include <vector> |
| 27 | |
| 28 | #include "workqueue.h" |
| 29 | #include "object.h" |
| 30 | |
| 31 | namespace gold |
| 32 | { |
| 33 | |
| 34 | class Input_objects; |
| 35 | class Symbol_table; |
| 36 | class Input_group; |
| 37 | class Archive; |
| 38 | |
| 39 | // This Task is responsible for reading the symbols from an input |
| 40 | // file. This also includes reading the relocations so that we can |
| 41 | // check for any that require a PLT and/or a GOT. After the data has |
| 42 | // been read, this queues up another task to actually add the symbols |
| 43 | // to the symbol table. The tasks are separated because the file |
| 44 | // reading can occur in parallel but adding the symbols must be done |
| 45 | // in the order of the input files. |
| 46 | |
| 47 | class Read_symbols : public Task |
| 48 | { |
| 49 | public: |
| 50 | // DIRPATH is the list of directories to search for libraries. |
| 51 | // INPUT is the file to read. INPUT_GROUP is not NULL if we are in |
| 52 | // the middle of an input group. THIS_BLOCKER is used to prevent |
| 53 | // the associated Add_symbols task from running before the previous |
| 54 | // one has completed; it will be NULL for the first task. |
| 55 | // NEXT_BLOCKER is used to block the next input file from adding |
| 56 | // symbols. |
| 57 | Read_symbols(const General_options& options, Input_objects* input_objects, |
| 58 | Symbol_table* symtab, Layout* layout, Dirsearch* dirpath, |
| 59 | Mapfile* mapfile, const Input_argument* input_argument, |
| 60 | Input_group* input_group, Task_token* this_blocker, |
| 61 | Task_token* next_blocker) |
| 62 | : options_(options), input_objects_(input_objects), symtab_(symtab), |
| 63 | layout_(layout), dirpath_(dirpath), mapfile_(mapfile), |
| 64 | input_argument_(input_argument), input_group_(input_group), |
| 65 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 66 | { } |
| 67 | |
| 68 | ~Read_symbols(); |
| 69 | |
| 70 | // The standard Task methods. |
| 71 | |
| 72 | Task_token* |
| 73 | is_runnable(); |
| 74 | |
| 75 | void |
| 76 | locks(Task_locker*); |
| 77 | |
| 78 | void |
| 79 | run(Workqueue*); |
| 80 | |
| 81 | std::string |
| 82 | get_name() const; |
| 83 | |
| 84 | private: |
| 85 | // Handle an archive group. |
| 86 | void |
| 87 | do_group(Workqueue*); |
| 88 | |
| 89 | // Open and identify the file. |
| 90 | bool |
| 91 | do_read_symbols(Workqueue*); |
| 92 | |
| 93 | const General_options& options_; |
| 94 | Input_objects* input_objects_; |
| 95 | Symbol_table* symtab_; |
| 96 | Layout* layout_; |
| 97 | Dirsearch* dirpath_; |
| 98 | Mapfile* mapfile_; |
| 99 | const Input_argument* input_argument_; |
| 100 | Input_group* input_group_; |
| 101 | Task_token* this_blocker_; |
| 102 | Task_token* next_blocker_; |
| 103 | }; |
| 104 | |
| 105 | // This Task handles adding the symbols to the symbol table. These |
| 106 | // tasks must be run in the same order as the arguments appear on the |
| 107 | // command line. |
| 108 | |
| 109 | class Add_symbols : public Task |
| 110 | { |
| 111 | public: |
| 112 | // THIS_BLOCKER is used to prevent this task from running before the |
| 113 | // one for the previous input file. NEXT_BLOCKER is used to prevent |
| 114 | // the next task from running. |
| 115 | Add_symbols(Input_objects* input_objects, Symbol_table* symtab, |
| 116 | Layout* layout, Object* object, |
| 117 | Read_symbols_data* sd, Task_token* this_blocker, |
| 118 | Task_token* next_blocker) |
| 119 | : input_objects_(input_objects), symtab_(symtab), layout_(layout), |
| 120 | object_(object), sd_(sd), this_blocker_(this_blocker), |
| 121 | next_blocker_(next_blocker) |
| 122 | { } |
| 123 | |
| 124 | ~Add_symbols(); |
| 125 | |
| 126 | // The standard Task methods. |
| 127 | |
| 128 | Task_token* |
| 129 | is_runnable(); |
| 130 | |
| 131 | void |
| 132 | locks(Task_locker*); |
| 133 | |
| 134 | void |
| 135 | run(Workqueue*); |
| 136 | |
| 137 | std::string |
| 138 | get_name() const |
| 139 | { return "Add_symbols " + this->object_->name(); } |
| 140 | |
| 141 | private: |
| 142 | Input_objects* input_objects_; |
| 143 | Symbol_table* symtab_; |
| 144 | Layout* layout_; |
| 145 | Object* object_; |
| 146 | Read_symbols_data* sd_; |
| 147 | Task_token* this_blocker_; |
| 148 | Task_token* next_blocker_; |
| 149 | }; |
| 150 | |
| 151 | // This class is used to track the archives in a group. |
| 152 | |
| 153 | class Input_group |
| 154 | { |
| 155 | public: |
| 156 | typedef std::vector<Archive*> Archives; |
| 157 | typedef Archives::const_iterator const_iterator; |
| 158 | |
| 159 | Input_group() |
| 160 | : archives_() |
| 161 | { } |
| 162 | |
| 163 | // Add an archive to the group. |
| 164 | void |
| 165 | add_archive(Archive* arch) |
| 166 | { this->archives_.push_back(arch); } |
| 167 | |
| 168 | // Loop over the archives in the group. |
| 169 | |
| 170 | const_iterator |
| 171 | begin() const |
| 172 | { return this->archives_.begin(); } |
| 173 | |
| 174 | const_iterator |
| 175 | end() const |
| 176 | { return this->archives_.end(); } |
| 177 | |
| 178 | private: |
| 179 | Archives archives_; |
| 180 | }; |
| 181 | |
| 182 | // This class is used to finish up handling a group. It is just a |
| 183 | // closure. |
| 184 | |
| 185 | class Finish_group : public Task |
| 186 | { |
| 187 | public: |
| 188 | Finish_group(Input_objects* input_objects, Symbol_table* symtab, |
| 189 | Layout* layout, Mapfile* mapfile, Input_group* input_group, |
| 190 | int saw_undefined, Task_token* this_blocker, |
| 191 | Task_token* next_blocker) |
| 192 | : input_objects_(input_objects), symtab_(symtab), |
| 193 | layout_(layout), mapfile_(mapfile), input_group_(input_group), |
| 194 | saw_undefined_(saw_undefined), this_blocker_(this_blocker), |
| 195 | next_blocker_(next_blocker) |
| 196 | { } |
| 197 | |
| 198 | ~Finish_group(); |
| 199 | |
| 200 | // The standard Task methods. |
| 201 | |
| 202 | Task_token* |
| 203 | is_runnable(); |
| 204 | |
| 205 | void |
| 206 | locks(Task_locker*); |
| 207 | |
| 208 | void |
| 209 | run(Workqueue*); |
| 210 | |
| 211 | std::string |
| 212 | get_name() const |
| 213 | { return "Finish_group"; } |
| 214 | |
| 215 | private: |
| 216 | Input_objects* input_objects_; |
| 217 | Symbol_table* symtab_; |
| 218 | Layout* layout_; |
| 219 | Mapfile* mapfile_; |
| 220 | Input_group* input_group_; |
| 221 | int saw_undefined_; |
| 222 | Task_token* this_blocker_; |
| 223 | Task_token* next_blocker_; |
| 224 | }; |
| 225 | |
| 226 | // This class is used to read a file which was not recognized as an |
| 227 | // object or archive. It tries to read it as a linker script, using |
| 228 | // the tokens to serialize with the calls to Add_symbols. |
| 229 | |
| 230 | class Read_script : public Task |
| 231 | { |
| 232 | public: |
| 233 | Read_script(const General_options& options, Symbol_table* symtab, |
| 234 | Layout* layout, Dirsearch* dirpath, Input_objects* input_objects, |
| 235 | Mapfile* mapfile, Input_group* input_group, |
| 236 | const Input_argument* input_argument, |
| 237 | Input_file* input_file, Task_token* this_blocker, |
| 238 | Task_token* next_blocker) |
| 239 | : options_(options), symtab_(symtab), layout_(layout), dirpath_(dirpath), |
| 240 | input_objects_(input_objects), mapfile_(mapfile), |
| 241 | input_group_(input_group), input_argument_(input_argument), |
| 242 | input_file_(input_file), this_blocker_(this_blocker), |
| 243 | next_blocker_(next_blocker) |
| 244 | { } |
| 245 | |
| 246 | ~Read_script(); |
| 247 | |
| 248 | // The standard Task methods. |
| 249 | |
| 250 | Task_token* |
| 251 | is_runnable(); |
| 252 | |
| 253 | void |
| 254 | locks(Task_locker*); |
| 255 | |
| 256 | void |
| 257 | run(Workqueue*); |
| 258 | |
| 259 | std::string |
| 260 | get_name() const; |
| 261 | |
| 262 | private: |
| 263 | const General_options& options_; |
| 264 | Symbol_table* symtab_; |
| 265 | Layout* layout_; |
| 266 | Dirsearch* dirpath_; |
| 267 | Input_objects* input_objects_; |
| 268 | Mapfile* mapfile_; |
| 269 | Input_group* input_group_; |
| 270 | const Input_argument* input_argument_; |
| 271 | Input_file* input_file_; |
| 272 | Task_token* this_blocker_; |
| 273 | Task_token* next_blocker_; |
| 274 | }; |
| 275 | |
| 276 | } // end namespace gold |
| 277 | |
| 278 | #endif // !defined(GOLD_READSYMS_H) |