1 // readsyms.cc -- read input file symbols for gold
17 // Class read_symbols.
19 Read_symbols::~Read_symbols()
21 // The this_blocker_ and next_blocker_ pointers are passed on to the
25 // Return whether a Read_symbols task is runnable. We can read an
26 // ordinary input file immediately. For an archive specified using
27 // -l, we have to wait until the search path is complete.
29 Task::Is_runnable_type
30 Read_symbols::is_runnable(Workqueue
*)
32 if (this->input_
.is_file()
33 && this->input_
.file().is_lib()
34 && this->dirpath_
.token().is_blocked())
40 // Return a Task_locker for a Read_symbols task. We don't need any
44 Read_symbols::locks(Workqueue
*)
49 // Run a Read_symbols task. This is where we actually read the
50 // symbols and relocations.
53 Read_symbols::run(Workqueue
* workqueue
)
55 if (this->input_
.is_group())
57 assert(this->input_group_
== NULL
);
58 this->do_group(workqueue
);
62 Input_file
* input_file
= new Input_file(this->input_
.file());
63 input_file
->open(this->options_
, this->dirpath_
);
65 // Read enough of the file to pick up the entire ELF header.
67 int ehdr_size
= elfcpp::Elf_sizes
<64>::ehdr_size
;
69 const unsigned char* p
= input_file
->file().get_view(0, ehdr_size
, &bytes
);
72 static unsigned char elfmagic
[4] =
74 elfcpp::ELFMAG0
, elfcpp::ELFMAG1
,
75 elfcpp::ELFMAG2
, elfcpp::ELFMAG3
77 if (memcmp(p
, elfmagic
, 4) == 0)
79 // This is an ELF object.
81 if (this->input_group_
!= NULL
)
84 _("%s: %s: ordinary object found in input group\n"),
85 program_name
, input_file
->name());
89 Object
* obj
= make_elf_object(this->input_
.file().name(),
90 input_file
, 0, p
, bytes
);
92 Read_symbols_data
* sd
= new Read_symbols_data
;
93 obj
->read_symbols(sd
);
94 workqueue
->queue_front(new Add_symbols(this->input_objects_
,
95 this->symtab_
, this->layout_
,
98 this->next_blocker_
));
100 // Opening the file locked it, so now we need to unlock it.
101 input_file
->file().unlock();
107 if (bytes
>= Archive::sarmag
)
109 if (memcmp(p
, Archive::armag
, Archive::sarmag
) == 0)
111 // This is an archive.
112 Archive
* arch
= new Archive(this->input_
.file().name(), input_file
);
114 workqueue
->queue(new Add_archive_symbols(this->symtab_
,
116 this->input_objects_
,
120 this->next_blocker_
));
125 // Here we have to handle any other input file types we need.
126 fprintf(stderr
, _("%s: %s: not an object or archive\n"),
127 program_name
, input_file
->file().filename().c_str());
131 // Handle a group. We need to walk through the arguments over and
132 // over until we don't see any new undefined symbols. We do this by
133 // setting off Read_symbols Tasks as usual, but recording the archive
134 // entries instead of deleting them. We also start a Finish_group
135 // Task which runs after we've read all the symbols. In that task we
136 // process the archives in a loop until we are done.
139 Read_symbols::do_group(Workqueue
* workqueue
)
141 Input_group
* input_group
= new Input_group();
143 const Input_file_group
* group
= this->input_
.group();
144 Task_token
* this_blocker
= this->this_blocker_
;
145 for (Input_file_group::const_iterator p
= group
->begin();
149 const Input_argument
& arg(*p
);
150 assert(arg
.is_file());
152 Task_token
* next_blocker
= new Task_token();
153 next_blocker
->add_blocker();
154 workqueue
->queue(new Read_symbols(this->options_
, this->input_objects_
,
155 this->symtab_
, this->layout_
,
156 this->dirpath_
, arg
, input_group
,
157 this_blocker
, next_blocker
));
158 this_blocker
= next_blocker
;
161 const int saw_undefined
= this->symtab_
->saw_undefined();
162 workqueue
->queue(new Finish_group(this->input_objects_
,
168 this->next_blocker_
));
171 // Class Add_symbols.
173 Add_symbols::~Add_symbols()
175 if (this->this_blocker_
!= NULL
)
176 delete this->this_blocker_
;
177 // next_blocker_ is deleted by the task associated with the next
181 // We are blocked by this_blocker_. We block next_blocker_. We also
184 Task::Is_runnable_type
185 Add_symbols::is_runnable(Workqueue
*)
187 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
189 if (this->object_
->is_locked())
194 class Add_symbols::Add_symbols_locker
: public Task_locker
197 Add_symbols_locker(Task_token
& token
, Workqueue
* workqueue
,
199 : blocker_(token
, workqueue
), objlock_(*object
)
203 Task_locker_block blocker_
;
204 Task_locker_obj
<Object
> objlock_
;
208 Add_symbols::locks(Workqueue
* workqueue
)
210 return new Add_symbols_locker(*this->next_blocker_
, workqueue
,
214 // Add the symbols in the object to the symbol table.
217 Add_symbols::run(Workqueue
*)
219 this->input_objects_
->add_object(this->object_
);
220 this->object_
->layout(this->layout_
, this->sd_
);
221 this->object_
->add_symbols(this->symtab_
, this->sd_
);
226 // Class Finish_group.
228 Finish_group::~Finish_group()
230 if (this->this_blocker_
!= NULL
)
231 delete this->this_blocker_
;
232 // next_blocker_ is deleted by the task associated with the next
233 // input file following the group.
236 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
238 Task::Is_runnable_type
239 Finish_group::is_runnable(Workqueue
*)
241 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
247 Finish_group::locks(Workqueue
* workqueue
)
249 return new Task_locker_block(*this->next_blocker_
, workqueue
);
252 // Loop over the archives until there are no new undefined symbols.
255 Finish_group::run(Workqueue
*)
257 int saw_undefined
= this->saw_undefined_
;
258 while (saw_undefined
!= this->symtab_
->saw_undefined())
260 saw_undefined
= this->symtab_
->saw_undefined();
262 for (Input_group::const_iterator p
= this->input_group_
->begin();
263 p
!= this->input_group_
->end();
266 Task_lock_obj
<Archive
> tl(**p
);
268 (*p
)->add_symbols(this->symtab_
, this->layout_
,
269 this->input_objects_
);
273 // Delete all the archives now that we no longer need them.
274 for (Input_group::const_iterator p
= this->input_group_
->begin();
275 p
!= this->input_group_
->end();
278 delete this->input_group_
;
281 } // End namespace gold.