1 /* Inferior process information for the remote server for GDB.
2 Copyright (C) 2002-2017 Free Software Foundation, Inc.
4 Contributed by MontaVista Software.
6 This file is part of GDB.
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, see <http://www.gnu.org/licenses/>. */
22 #include "gdbthread.h"
25 struct inferior_list all_processes
;
26 struct inferior_list all_threads
;
28 struct thread_info
*current_thread
;
30 #define get_thread(inf) ((struct thread_info *)(inf))
33 add_inferior_to_list (struct inferior_list
*list
,
34 struct inferior_list_entry
*new_inferior
)
36 new_inferior
->next
= NULL
;
37 if (list
->tail
!= NULL
)
38 list
->tail
->next
= new_inferior
;
40 list
->head
= new_inferior
;
41 list
->tail
= new_inferior
;
44 /* Invoke ACTION for each inferior in LIST. */
47 for_each_inferior (struct inferior_list
*list
,
48 void (*action
) (struct inferior_list_entry
*))
50 struct inferior_list_entry
*cur
= list
->head
, *next
;
60 /* Invoke ACTION for each inferior in LIST, passing DATA to ACTION. */
63 for_each_inferior_with_data (struct inferior_list
*list
,
64 void (*action
) (struct inferior_list_entry
*,
68 struct inferior_list_entry
*cur
= list
->head
, *next
;
73 (*action
) (cur
, data
);
79 remove_inferior (struct inferior_list
*list
,
80 struct inferior_list_entry
*entry
)
82 struct inferior_list_entry
**cur
;
84 if (list
->head
== entry
)
86 list
->head
= entry
->next
;
87 if (list
->tail
== entry
)
88 list
->tail
= list
->head
;
93 while (*cur
&& (*cur
)->next
!= entry
)
99 (*cur
)->next
= entry
->next
;
101 if (list
->tail
== entry
)
106 add_thread (ptid_t thread_id
, void *target_data
)
108 struct thread_info
*new_thread
= XCNEW (struct thread_info
);
110 new_thread
->entry
.id
= thread_id
;
111 new_thread
->last_resume_kind
= resume_continue
;
112 new_thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
114 add_inferior_to_list (&all_threads
, &new_thread
->entry
);
116 if (current_thread
== NULL
)
117 current_thread
= new_thread
;
119 new_thread
->target_data
= target_data
;
125 thread_to_gdb_id (struct thread_info
*thread
)
127 return thread
->entry
.id
;
130 /* Wrapper around get_first_inferior to return a struct thread_info *. */
133 get_first_thread (void)
135 return (struct thread_info
*) get_first_inferior (&all_threads
);
139 find_thread_ptid (ptid_t ptid
)
141 return (struct thread_info
*) find_inferior_id (&all_threads
, ptid
);
144 /* Find a thread associated with the given PROCESS, or NULL if no
145 such thread exists. */
147 static struct thread_info
*
148 find_thread_process (const struct process_info
*const process
)
150 return find_any_thread_of_pid (process
->entry
.id
.pid ());
153 /* Helper for find_any_thread_of_pid. Returns true if a thread
157 thread_of_pid (struct inferior_list_entry
*entry
, void *pid_p
)
159 int pid
= *(int *) pid_p
;
161 return (ptid_get_pid (entry
->id
) == pid
);
164 /* See gdbthread.h. */
167 find_any_thread_of_pid (int pid
)
169 struct inferior_list_entry
*entry
;
171 entry
= find_inferior (&all_threads
, thread_of_pid
, &pid
);
173 return (struct thread_info
*) entry
;
177 gdb_id_to_thread_id (ptid_t gdb_id
)
179 struct thread_info
*thread
= find_thread_ptid (gdb_id
);
181 return thread
? thread
->entry
.id
: null_ptid
;
185 free_one_thread (struct inferior_list_entry
*inf
)
187 struct thread_info
*thread
= get_thread (inf
);
188 free_register_cache (thread_regcache_data (thread
));
193 remove_thread (struct thread_info
*thread
)
195 if (thread
->btrace
!= NULL
)
196 target_disable_btrace (thread
->btrace
);
198 discard_queued_stop_replies (ptid_of (thread
));
199 remove_inferior (&all_threads
, (struct inferior_list_entry
*) thread
);
200 free_one_thread (&thread
->entry
);
201 if (current_thread
== thread
)
202 current_thread
= NULL
;
205 /* Return a pointer to the first inferior in LIST, or NULL if there isn't one.
206 This is for cases where the caller needs a thread, but doesn't care
209 struct inferior_list_entry
*
210 get_first_inferior (struct inferior_list
*list
)
212 if (list
->head
!= NULL
)
217 /* Find the first inferior_list_entry E in LIST for which FUNC (E, ARG)
218 returns non-zero. If no entry is found then return NULL. */
220 struct inferior_list_entry
*
221 find_inferior (struct inferior_list
*list
,
222 int (*func
) (struct inferior_list_entry
*, void *), void *arg
)
224 struct inferior_list_entry
*inf
= list
->head
;
228 struct inferior_list_entry
*next
;
231 if ((*func
) (inf
, arg
))
239 /* Find the random inferior_list_entry E in LIST for which FUNC (E, ARG)
240 returns non-zero. If no entry is found then return NULL. */
242 struct inferior_list_entry
*
243 find_inferior_in_random (struct inferior_list
*list
,
244 int (*func
) (struct inferior_list_entry
*, void *),
247 struct inferior_list_entry
*inf
= list
->head
;
251 /* First count how many interesting entries we have. */
254 struct inferior_list_entry
*next
;
257 if ((*func
) (inf
, arg
))
265 /* Now randomly pick an entry out of those. */
266 random_selector
= (int)
267 ((count
* (double) rand ()) / (RAND_MAX
+ 1.0));
272 struct inferior_list_entry
*next
;
275 if ((*func
) (inf
, arg
) && (random_selector
-- == 0))
280 gdb_assert_not_reached ("failed to find an inferior in random.");
284 struct inferior_list_entry
*
285 find_inferior_id (struct inferior_list
*list
, ptid_t id
)
287 struct inferior_list_entry
*inf
= list
->head
;
291 if (ptid_equal (inf
->id
, id
))
300 thread_target_data (struct thread_info
*thread
)
302 return thread
->target_data
;
306 thread_regcache_data (struct thread_info
*thread
)
308 return thread
->regcache_data
;
312 set_thread_regcache_data (struct thread_info
*thread
, struct regcache
*data
)
314 thread
->regcache_data
= data
;
317 /* Return true if LIST has exactly one entry. */
320 one_inferior_p (struct inferior_list
*list
)
322 return list
->head
!= NULL
&& list
->head
== list
->tail
;
325 /* Reset head,tail of LIST, assuming all entries have already been freed. */
328 clear_inferior_list (struct inferior_list
*list
)
335 clear_inferiors (void)
337 for_each_inferior (&all_threads
, free_one_thread
);
338 clear_inferior_list (&all_threads
);
342 current_thread
= NULL
;
345 struct process_info
*
346 add_process (int pid
, int attached
)
348 struct process_info
*process
= XCNEW (struct process_info
);
350 process
->entry
.id
= pid_to_ptid (pid
);
351 process
->attached
= attached
;
353 add_inferior_to_list (&all_processes
, &process
->entry
);
358 /* Remove a process from the common process list and free the memory
360 The caller is responsible for freeing private data first. */
363 remove_process (struct process_info
*process
)
365 clear_symbol_cache (&process
->symbol_cache
);
366 free_all_breakpoints (process
);
367 gdb_assert (find_thread_process (process
) == NULL
);
368 remove_inferior (&all_processes
, &process
->entry
);
369 VEC_free (int, process
->syscalls_to_catch
);
373 struct process_info
*
374 find_process_pid (int pid
)
376 return (struct process_info
*)
377 find_inferior_id (&all_processes
, pid_to_ptid (pid
));
380 /* Wrapper around get_first_inferior to return a struct process_info *. */
382 struct process_info
*
383 get_first_process (void)
385 return (struct process_info
*) get_first_inferior (&all_processes
);
388 /* Return non-zero if INF, a struct process_info, was started by us,
389 i.e. not attached to. */
392 started_inferior_callback (struct inferior_list_entry
*entry
, void *args
)
394 struct process_info
*process
= (struct process_info
*) entry
;
396 return ! process
->attached
;
399 /* Return non-zero if there are any inferiors that we have created
400 (as opposed to attached-to). */
403 have_started_inferiors_p (void)
405 return (find_inferior (&all_processes
, started_inferior_callback
, NULL
)
409 /* Return non-zero if INF, a struct process_info, was attached to. */
412 attached_inferior_callback (struct inferior_list_entry
*entry
, void *args
)
414 struct process_info
*process
= (struct process_info
*) entry
;
416 return process
->attached
;
419 /* Return non-zero if there are any inferiors that we have attached to. */
422 have_attached_inferiors_p (void)
424 return (find_inferior (&all_processes
, attached_inferior_callback
, NULL
)
428 struct process_info
*
429 get_thread_process (const struct thread_info
*thread
)
431 int pid
= ptid_get_pid (thread
->entry
.id
);
432 return find_process_pid (pid
);
435 struct process_info
*
436 current_process (void)
438 gdb_assert (current_thread
!= NULL
);
439 return get_thread_process (current_thread
);
443 do_restore_current_thread_cleanup (void *arg
)
445 current_thread
= (struct thread_info
*) arg
;
449 make_cleanup_restore_current_thread (void)
451 return make_cleanup (do_restore_current_thread_cleanup
, current_thread
);
454 /* See common/common-gdbthread.h. */
457 switch_to_thread (ptid_t ptid
)
459 if (!ptid_equal (ptid
, minus_one_ptid
))
460 current_thread
= find_thread_ptid (ptid
);