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 const int ehdr_size
= elfcpp::Elf_sizes
<64>::ehdr_size
;
90 unsigned char ehdr_buf
[ehdr_size
];
92 input_file
->file().read_up_to(0, ehdr_size
, ehdr_buf
, &bytes
);
96 static unsigned char elfmagic
[4] =
98 elfcpp::ELFMAG0
, elfcpp::ELFMAG1
,
99 elfcpp::ELFMAG2
, elfcpp::ELFMAG3
101 if (memcmp(ehdr_buf
, elfmagic
, 4) == 0)
103 // This is an ELF object.
105 Object
* obj
= make_elf_object(input_file
->filename(),
106 input_file
, 0, ehdr_buf
, bytes
);
108 // We don't have a way to record a non-archive in an input
109 // group. If this is an ordinary object file, we can't
110 // include it more than once anyhow. If this is a dynamic
111 // object, then including it a second time changes nothing.
112 if (this->input_group_
!= NULL
&& !obj
->is_dynamic())
115 _("%s: %s: ordinary object found in input group\n"),
116 program_name
, input_file
->name());
120 Read_symbols_data
* sd
= new Read_symbols_data
;
121 obj
->read_symbols(sd
);
122 workqueue
->queue_front(new Add_symbols(this->input_objects_
,
123 this->symtab_
, this->layout_
,
126 this->next_blocker_
));
128 // Opening the file locked it, so now we need to unlock it.
129 input_file
->file().unlock();
135 if (bytes
>= Archive::sarmag
)
137 if (memcmp(ehdr_buf
, Archive::armag
, Archive::sarmag
) == 0)
139 // This is an archive.
140 Archive
* arch
= new Archive(this->input_argument_
->file().name(),
143 workqueue
->queue(new Add_archive_symbols(this->symtab_
,
145 this->input_objects_
,
149 this->next_blocker_
));
156 fprintf(stderr
, _("%s: %s: file is empty\n"),
157 program_name
, input_file
->file().filename().c_str());
161 // Try to parse this file as a script.
162 if (read_input_script(workqueue
, this->options_
, this->symtab_
,
163 this->layout_
, this->dirpath_
, this->input_objects_
,
164 this->input_group_
, this->input_argument_
, input_file
,
165 ehdr_buf
, bytes
, this->this_blocker_
,
166 this->next_blocker_
))
169 // Here we have to handle any other input file types we need.
170 fprintf(stderr
, _("%s: %s: not an object or archive\n"),
171 program_name
, input_file
->file().filename().c_str());
175 // Handle a group. We need to walk through the arguments over and
176 // over until we don't see any new undefined symbols. We do this by
177 // setting off Read_symbols Tasks as usual, but recording the archive
178 // entries instead of deleting them. We also start a Finish_group
179 // Task which runs after we've read all the symbols. In that task we
180 // process the archives in a loop until we are done.
183 Read_symbols::do_group(Workqueue
* workqueue
)
185 Input_group
* input_group
= new Input_group();
187 const Input_file_group
* group
= this->input_argument_
->group();
188 Task_token
* this_blocker
= this->this_blocker_
;
189 for (Input_file_group::const_iterator p
= group
->begin();
193 const Input_argument
* arg
= &*p
;
194 gold_assert(arg
->is_file());
196 Task_token
* next_blocker
= new Task_token();
197 next_blocker
->add_blocker();
198 workqueue
->queue(new Read_symbols(this->options_
, this->input_objects_
,
199 this->symtab_
, this->layout_
,
200 this->dirpath_
, arg
, input_group
,
201 this_blocker
, next_blocker
));
202 this_blocker
= next_blocker
;
205 const int saw_undefined
= this->symtab_
->saw_undefined();
206 workqueue
->queue(new Finish_group(this->input_objects_
,
212 this->next_blocker_
));
215 // Class Add_symbols.
217 Add_symbols::~Add_symbols()
219 if (this->this_blocker_
!= NULL
)
220 delete this->this_blocker_
;
221 // next_blocker_ is deleted by the task associated with the next
225 // We are blocked by this_blocker_. We block next_blocker_. We also
228 Task::Is_runnable_type
229 Add_symbols::is_runnable(Workqueue
*)
231 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
233 if (this->object_
->is_locked())
238 class Add_symbols::Add_symbols_locker
: public Task_locker
241 Add_symbols_locker(Task_token
& token
, Workqueue
* workqueue
,
243 : blocker_(token
, workqueue
), objlock_(*object
)
247 Task_locker_block blocker_
;
248 Task_locker_obj
<Object
> objlock_
;
252 Add_symbols::locks(Workqueue
* workqueue
)
254 return new Add_symbols_locker(*this->next_blocker_
, workqueue
,
258 // Add the symbols in the object to the symbol table.
261 Add_symbols::run(Workqueue
*)
263 if (!this->input_objects_
->add_object(this->object_
))
265 // FIXME: We need to close the descriptor here.
266 delete this->object_
;
270 this->object_
->layout(this->symtab_
, this->layout_
, this->sd_
);
271 this->object_
->add_symbols(this->symtab_
, this->sd_
);
277 // Class Finish_group.
279 Finish_group::~Finish_group()
281 if (this->this_blocker_
!= NULL
)
282 delete this->this_blocker_
;
283 // next_blocker_ is deleted by the task associated with the next
284 // input file following the group.
287 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
289 Task::Is_runnable_type
290 Finish_group::is_runnable(Workqueue
*)
292 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
298 Finish_group::locks(Workqueue
* workqueue
)
300 return new Task_locker_block(*this->next_blocker_
, workqueue
);
303 // Loop over the archives until there are no new undefined symbols.
306 Finish_group::run(Workqueue
*)
308 int saw_undefined
= this->saw_undefined_
;
309 while (saw_undefined
!= this->symtab_
->saw_undefined())
311 saw_undefined
= this->symtab_
->saw_undefined();
313 for (Input_group::const_iterator p
= this->input_group_
->begin();
314 p
!= this->input_group_
->end();
317 Task_lock_obj
<Archive
> tl(**p
);
319 (*p
)->add_symbols(this->symtab_
, this->layout_
,
320 this->input_objects_
);
324 // Delete all the archives now that we no longer need them.
325 for (Input_group::const_iterator p
= this->input_group_
->begin();
326 p
!= this->input_group_
->end();
329 delete this->input_group_
;
332 } // End namespace gold.