1 // readsyms.cc -- read input file symbols for gold
3 // Copyright 2006, 2007 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
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.
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.
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.
29 #include "dirsearch.h"
39 // Class read_symbols.
41 Read_symbols::~Read_symbols()
43 // The this_blocker_ and next_blocker_ pointers are passed on to the
47 // Return whether a Read_symbols task is runnable. We can read an
48 // ordinary input file immediately. For an archive specified using
49 // -l, we have to wait until the search path is complete.
51 Task::Is_runnable_type
52 Read_symbols::is_runnable(Workqueue*)
54 if (this->input_argument_->is_file()
55 && this->input_argument_->file().is_lib()
56 && this->dirpath_.token().is_blocked())
62 // Return a Task_locker for a Read_symbols task. We don't need any
66 Read_symbols::locks(Workqueue*)
71 // Run a Read_symbols task. This is where we actually read the
72 // symbols and relocations.
75 Read_symbols::run(Workqueue* workqueue)
77 if (this->input_argument_->is_group())
79 gold_assert(this->input_group_ == NULL);
80 this->do_group(workqueue);
84 Input_file* input_file = new Input_file(&this->input_argument_->file());
85 input_file->open(this->options_, this->dirpath_);
87 // Read enough of the file to pick up the entire ELF header.
89 int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
91 const unsigned char* p = input_file->file().get_view(0, ehdr_size, &bytes);
94 static unsigned char elfmagic[4] =
96 elfcpp::ELFMAG0, elfcpp::ELFMAG1,
97 elfcpp::ELFMAG2, elfcpp::ELFMAG3
99 if (memcmp(p, elfmagic, 4) == 0)
101 // This is an ELF object.
103 Object* obj = make_elf_object(input_file->filename(),
104 input_file, 0, p, bytes);
106 // We don't have a way to record a non-archive in an input
107 // group. If this is an ordinary object file, we can't
108 // include it more than once anyhow. If this is a dynamic
109 // object, then including it a second time changes nothing.
110 if (this->input_group_ != NULL && !obj->is_dynamic())
113 _("%s: %s: ordinary object found in input group\n"),
114 program_name, input_file->name());
118 Read_symbols_data* sd = new Read_symbols_data;
119 obj->read_symbols(sd);
120 workqueue->queue_front(new Add_symbols(this->input_objects_,
121 this->symtab_, this->layout_,
124 this->next_blocker_));
126 // Opening the file locked it, so now we need to unlock it.
127 input_file->file().unlock();
133 if (bytes >= Archive::sarmag)
135 if (memcmp(p, Archive::armag, Archive::sarmag) == 0)
137 // This is an archive.
138 Archive* arch = new Archive(this->input_argument_->file().name(),
141 workqueue->queue(new Add_archive_symbols(this->symtab_,
143 this->input_objects_,
147 this->next_blocker_));
154 fprintf(stderr, _("%s: %s: file is empty\n"),
155 program_name, input_file->file().filename().c_str());
159 // Try to parse this file as a script.
160 if (read_input_script(workqueue, this->options_, this->symtab_,
161 this->layout_, this->dirpath_, this->input_objects_,
162 this->input_group_, this->input_argument_, input_file,
163 p, bytes, this->this_blocker_, this->next_blocker_))
166 // Here we have to handle any other input file types we need.
167 fprintf(stderr, _("%s: %s: not an object or archive\n"),
168 program_name, input_file->file().filename().c_str());
172 // Handle a group. We need to walk through the arguments over and
173 // over until we don't see any new undefined symbols. We do this by
174 // setting off Read_symbols Tasks as usual, but recording the archive
175 // entries instead of deleting them. We also start a Finish_group
176 // Task which runs after we've read all the symbols. In that task we
177 // process the archives in a loop until we are done.
180 Read_symbols::do_group(Workqueue* workqueue)
182 Input_group* input_group = new Input_group();
184 const Input_file_group* group = this->input_argument_->group();
185 Task_token* this_blocker = this->this_blocker_;
186 for (Input_file_group::const_iterator p = group->begin();
190 const Input_argument* arg = &*p;
191 gold_assert(arg->is_file());
193 Task_token* next_blocker = new Task_token();
194 next_blocker->add_blocker();
195 workqueue->queue(new Read_symbols(this->options_, this->input_objects_,
196 this->symtab_, this->layout_,
197 this->dirpath_, arg, input_group,
198 this_blocker, next_blocker));
199 this_blocker = next_blocker;
202 const int saw_undefined = this->symtab_->saw_undefined();
203 workqueue->queue(new Finish_group(this->input_objects_,
209 this->next_blocker_));
212 // Class Add_symbols.
214 Add_symbols::~Add_symbols()
216 if (this->this_blocker_ != NULL)
217 delete this->this_blocker_;
218 // next_blocker_ is deleted by the task associated with the next
222 // We are blocked by this_blocker_. We block next_blocker_. We also
225 Task::Is_runnable_type
226 Add_symbols::is_runnable(Workqueue*)
228 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
230 if (this->object_->is_locked())
235 class Add_symbols::Add_symbols_locker : public Task_locker
238 Add_symbols_locker(Task_token& token, Workqueue* workqueue,
240 : blocker_(token, workqueue), objlock_(*object)
244 Task_locker_block blocker_;
245 Task_locker_obj<Object> objlock_;
249 Add_symbols::locks(Workqueue* workqueue)
251 return new Add_symbols_locker(*this->next_blocker_, workqueue,
255 // Add the symbols in the object to the symbol table.
258 Add_symbols::run(Workqueue*)
260 if (!this->input_objects_->add_object(this->object_))
262 // FIXME: We need to close the descriptor here.
263 delete this->object_;
267 this->object_->layout(this->symtab_, this->layout_, this->sd_);
268 this->object_->add_symbols(this->symtab_, this->sd_);
274 // Class Finish_group.
276 Finish_group::~Finish_group()
278 if (this->this_blocker_ != NULL)
279 delete this->this_blocker_;
280 // next_blocker_ is deleted by the task associated with the next
281 // input file following the group.
284 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
286 Task::Is_runnable_type
287 Finish_group::is_runnable(Workqueue*)
289 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
295 Finish_group::locks(Workqueue* workqueue)
297 return new Task_locker_block(*this->next_blocker_, workqueue);
300 // Loop over the archives until there are no new undefined symbols.
303 Finish_group::run(Workqueue*)
305 int saw_undefined = this->saw_undefined_;
306 while (saw_undefined != this->symtab_->saw_undefined())
308 saw_undefined = this->symtab_->saw_undefined();
310 for (Input_group::const_iterator p = this->input_group_->begin();
311 p != this->input_group_->end();
314 Task_lock_obj<Archive> tl(**p);
316 (*p)->add_symbols(this->symtab_, this->layout_,
317 this->input_objects_);
321 // Delete all the archives now that we no longer need them.
322 for (Input_group::const_iterator p = this->input_group_->begin();
323 p != this->input_group_->end();
326 delete this->input_group_;
329 } // End namespace gold.