| 1 | /* Multi-process/thread control for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 4 | 2000, 2001, 2002, 2003, 2004, 2007, 2008 Free Software Foundation, Inc. |
| 5 | |
| 6 | Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA. |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 3 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "symtab.h" |
| 25 | #include "frame.h" |
| 26 | #include "inferior.h" |
| 27 | #include "environ.h" |
| 28 | #include "value.h" |
| 29 | #include "target.h" |
| 30 | #include "gdbthread.h" |
| 31 | #include "exceptions.h" |
| 32 | #include "command.h" |
| 33 | #include "gdbcmd.h" |
| 34 | #include "regcache.h" |
| 35 | #include "gdb.h" |
| 36 | #include "gdb_string.h" |
| 37 | |
| 38 | #include <ctype.h> |
| 39 | #include <sys/types.h> |
| 40 | #include <signal.h> |
| 41 | #include "ui-out.h" |
| 42 | #include "observer.h" |
| 43 | #include "annotate.h" |
| 44 | #include "cli/cli-decode.h" |
| 45 | |
| 46 | /* Definition of struct thread_info exported to gdbthread.h */ |
| 47 | |
| 48 | /* Prototypes for exported functions. */ |
| 49 | |
| 50 | void _initialize_thread (void); |
| 51 | |
| 52 | /* Prototypes for local functions. */ |
| 53 | |
| 54 | static struct thread_info *thread_list = NULL; |
| 55 | static int highest_thread_num; |
| 56 | |
| 57 | static void thread_command (char *tidstr, int from_tty); |
| 58 | static void thread_apply_all_command (char *, int); |
| 59 | static int thread_alive (struct thread_info *); |
| 60 | static void info_threads_command (char *, int); |
| 61 | static void thread_apply_command (char *, int); |
| 62 | static void restore_current_thread (ptid_t); |
| 63 | static void prune_threads (void); |
| 64 | |
| 65 | /* Frontend view of the thread state. Possible extensions: stepping, |
| 66 | finishing, until(ling),... */ |
| 67 | enum thread_state |
| 68 | { |
| 69 | THREAD_STOPPED, |
| 70 | THREAD_RUNNING, |
| 71 | THREAD_EXITED, |
| 72 | }; |
| 73 | |
| 74 | static enum thread_state main_thread_state = THREAD_STOPPED; |
| 75 | static int main_thread_executing = 0; |
| 76 | |
| 77 | extern struct thread_info* |
| 78 | inferior_thread (void) |
| 79 | { |
| 80 | struct thread_info *tp = find_thread_pid (inferior_ptid); |
| 81 | gdb_assert (tp); |
| 82 | return tp; |
| 83 | } |
| 84 | |
| 85 | void |
| 86 | delete_step_resume_breakpoint (struct thread_info *tp) |
| 87 | { |
| 88 | if (tp && tp->step_resume_breakpoint) |
| 89 | { |
| 90 | delete_breakpoint (tp->step_resume_breakpoint); |
| 91 | tp->step_resume_breakpoint = NULL; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | static void |
| 96 | clear_thread_inferior_resources (struct thread_info *tp) |
| 97 | { |
| 98 | /* NOTE: this will take care of any left-over step_resume breakpoints, |
| 99 | but not any user-specified thread-specific breakpoints. We can not |
| 100 | delete the breakpoint straight-off, because the inferior might not |
| 101 | be stopped at the moment. */ |
| 102 | if (tp->step_resume_breakpoint) |
| 103 | { |
| 104 | tp->step_resume_breakpoint->disposition = disp_del_at_next_stop; |
| 105 | tp->step_resume_breakpoint = NULL; |
| 106 | } |
| 107 | |
| 108 | bpstat_clear (&tp->stop_bpstat); |
| 109 | |
| 110 | discard_all_intermediate_continuations_thread (tp); |
| 111 | discard_all_continuations_thread (tp); |
| 112 | } |
| 113 | |
| 114 | static void |
| 115 | free_thread (struct thread_info *tp) |
| 116 | { |
| 117 | clear_thread_inferior_resources (tp); |
| 118 | |
| 119 | /* FIXME: do I ever need to call the back-end to give it a |
| 120 | chance at this private data before deleting the thread? */ |
| 121 | if (tp->private) |
| 122 | xfree (tp->private); |
| 123 | |
| 124 | xfree (tp); |
| 125 | } |
| 126 | |
| 127 | void |
| 128 | init_thread_list (void) |
| 129 | { |
| 130 | struct thread_info *tp, *tpnext; |
| 131 | |
| 132 | highest_thread_num = 0; |
| 133 | main_thread_state = THREAD_STOPPED; |
| 134 | main_thread_executing = 0; |
| 135 | |
| 136 | if (!thread_list) |
| 137 | return; |
| 138 | |
| 139 | for (tp = thread_list; tp; tp = tpnext) |
| 140 | { |
| 141 | tpnext = tp->next; |
| 142 | free_thread (tp); |
| 143 | } |
| 144 | |
| 145 | thread_list = NULL; |
| 146 | } |
| 147 | |
| 148 | struct thread_info * |
| 149 | add_thread_silent (ptid_t ptid) |
| 150 | { |
| 151 | struct thread_info *tp; |
| 152 | |
| 153 | tp = find_thread_pid (ptid); |
| 154 | if (tp) |
| 155 | /* Found an old thread with the same id. It has to be dead, |
| 156 | otherwise we wouldn't be adding a new thread with the same id. |
| 157 | The OS is reusing this id --- delete it, and recreate a new |
| 158 | one. */ |
| 159 | { |
| 160 | /* In addition to deleting the thread, if this is the current |
| 161 | thread, then we need to also get rid of the current infrun |
| 162 | context, and take care that delete_thread doesn't really |
| 163 | delete the thread if it is inferior_ptid. Create a new |
| 164 | template thread in the list with an invalid ptid, context |
| 165 | switch to it, delete the original thread, reset the new |
| 166 | thread's ptid, and switch to it. */ |
| 167 | |
| 168 | if (ptid_equal (inferior_ptid, ptid)) |
| 169 | { |
| 170 | tp = xmalloc (sizeof (*tp)); |
| 171 | memset (tp, 0, sizeof (*tp)); |
| 172 | tp->ptid = minus_one_ptid; |
| 173 | tp->num = ++highest_thread_num; |
| 174 | tp->next = thread_list; |
| 175 | thread_list = tp; |
| 176 | context_switch_to (minus_one_ptid); |
| 177 | |
| 178 | /* Now we can delete it. */ |
| 179 | delete_thread (ptid); |
| 180 | |
| 181 | /* Since the context is already set to this new thread, |
| 182 | reset its ptid, and reswitch inferior_ptid to it. */ |
| 183 | tp->ptid = ptid; |
| 184 | switch_to_thread (ptid); |
| 185 | |
| 186 | observer_notify_new_thread (tp); |
| 187 | |
| 188 | /* All done. */ |
| 189 | return tp; |
| 190 | } |
| 191 | else |
| 192 | /* Just go ahead and delete it. */ |
| 193 | delete_thread (ptid); |
| 194 | } |
| 195 | |
| 196 | tp = (struct thread_info *) xmalloc (sizeof (*tp)); |
| 197 | memset (tp, 0, sizeof (*tp)); |
| 198 | tp->ptid = ptid; |
| 199 | tp->num = ++highest_thread_num; |
| 200 | tp->next = thread_list; |
| 201 | thread_list = tp; |
| 202 | |
| 203 | observer_notify_new_thread (tp); |
| 204 | |
| 205 | return tp; |
| 206 | } |
| 207 | |
| 208 | struct thread_info * |
| 209 | add_thread_with_info (ptid_t ptid, struct private_thread_info *private) |
| 210 | { |
| 211 | struct thread_info *result = add_thread_silent (ptid); |
| 212 | |
| 213 | result->private = private; |
| 214 | |
| 215 | if (print_thread_events) |
| 216 | printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid)); |
| 217 | |
| 218 | annotate_new_thread (); |
| 219 | return result; |
| 220 | } |
| 221 | |
| 222 | struct thread_info * |
| 223 | add_thread (ptid_t ptid) |
| 224 | { |
| 225 | return add_thread_with_info (ptid, NULL); |
| 226 | } |
| 227 | |
| 228 | /* Delete thread PTID. If SILENT, don't notify the observer of this |
| 229 | exit. */ |
| 230 | static void |
| 231 | delete_thread_1 (ptid_t ptid, int silent) |
| 232 | { |
| 233 | struct thread_info *tp, *tpprev; |
| 234 | |
| 235 | tpprev = NULL; |
| 236 | |
| 237 | for (tp = thread_list; tp; tpprev = tp, tp = tp->next) |
| 238 | if (ptid_equal (tp->ptid, ptid)) |
| 239 | break; |
| 240 | |
| 241 | if (!tp) |
| 242 | return; |
| 243 | |
| 244 | /* If this is the current thread, or there's code out there that |
| 245 | relies on it existing (refcount > 0) we can't delete yet. Mark |
| 246 | it as exited, and notify it. */ |
| 247 | if (tp->refcount > 0 |
| 248 | || ptid_equal (tp->ptid, inferior_ptid)) |
| 249 | { |
| 250 | if (tp->state_ != THREAD_EXITED) |
| 251 | { |
| 252 | if (!silent) |
| 253 | observer_notify_thread_exit (tp); |
| 254 | |
| 255 | /* Tag it as exited. */ |
| 256 | tp->state_ = THREAD_EXITED; |
| 257 | |
| 258 | /* Clear breakpoints, etc. associated with this thread. */ |
| 259 | clear_thread_inferior_resources (tp); |
| 260 | } |
| 261 | |
| 262 | /* Will be really deleted some other time. */ |
| 263 | return; |
| 264 | } |
| 265 | |
| 266 | if (tpprev) |
| 267 | tpprev->next = tp->next; |
| 268 | else |
| 269 | thread_list = tp->next; |
| 270 | |
| 271 | /* Notify thread exit, but only if we haven't already. */ |
| 272 | if (!silent && tp->state_ != THREAD_EXITED) |
| 273 | observer_notify_thread_exit (tp); |
| 274 | |
| 275 | free_thread (tp); |
| 276 | } |
| 277 | |
| 278 | /* Delete thread PTID and notify of thread exit. If this is |
| 279 | inferior_ptid, don't actually delete it, but tag it as exited and |
| 280 | do the notification. If PTID is the user selected thread, clear |
| 281 | it. */ |
| 282 | void |
| 283 | delete_thread (ptid_t ptid) |
| 284 | { |
| 285 | delete_thread_1 (ptid, 0 /* not silent */); |
| 286 | } |
| 287 | |
| 288 | void |
| 289 | delete_thread_silent (ptid_t ptid) |
| 290 | { |
| 291 | delete_thread_1 (ptid, 1 /* silent */); |
| 292 | } |
| 293 | |
| 294 | struct thread_info * |
| 295 | find_thread_id (int num) |
| 296 | { |
| 297 | struct thread_info *tp; |
| 298 | |
| 299 | for (tp = thread_list; tp; tp = tp->next) |
| 300 | if (tp->num == num) |
| 301 | return tp; |
| 302 | |
| 303 | return NULL; |
| 304 | } |
| 305 | |
| 306 | /* Find a thread_info by matching PTID. */ |
| 307 | struct thread_info * |
| 308 | find_thread_pid (ptid_t ptid) |
| 309 | { |
| 310 | struct thread_info *tp; |
| 311 | |
| 312 | for (tp = thread_list; tp; tp = tp->next) |
| 313 | if (ptid_equal (tp->ptid, ptid)) |
| 314 | return tp; |
| 315 | |
| 316 | return NULL; |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * Thread iterator function. |
| 321 | * |
| 322 | * Calls a callback function once for each thread, so long as |
| 323 | * the callback function returns false. If the callback function |
| 324 | * returns true, the iteration will end and the current thread |
| 325 | * will be returned. This can be useful for implementing a |
| 326 | * search for a thread with arbitrary attributes, or for applying |
| 327 | * some operation to every thread. |
| 328 | * |
| 329 | * FIXME: some of the existing functionality, such as |
| 330 | * "Thread apply all", might be rewritten using this functionality. |
| 331 | */ |
| 332 | |
| 333 | struct thread_info * |
| 334 | iterate_over_threads (int (*callback) (struct thread_info *, void *), |
| 335 | void *data) |
| 336 | { |
| 337 | struct thread_info *tp, *next; |
| 338 | |
| 339 | for (tp = thread_list; tp; tp = next) |
| 340 | { |
| 341 | next = tp->next; |
| 342 | if ((*callback) (tp, data)) |
| 343 | return tp; |
| 344 | } |
| 345 | |
| 346 | return NULL; |
| 347 | } |
| 348 | |
| 349 | int |
| 350 | thread_count (void) |
| 351 | { |
| 352 | int result = 0; |
| 353 | struct thread_info *tp; |
| 354 | |
| 355 | for (tp = thread_list; tp; tp = tp->next) |
| 356 | ++result; |
| 357 | |
| 358 | return result; |
| 359 | } |
| 360 | |
| 361 | int |
| 362 | valid_thread_id (int num) |
| 363 | { |
| 364 | struct thread_info *tp; |
| 365 | |
| 366 | for (tp = thread_list; tp; tp = tp->next) |
| 367 | if (tp->num == num) |
| 368 | return 1; |
| 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | int |
| 374 | pid_to_thread_id (ptid_t ptid) |
| 375 | { |
| 376 | struct thread_info *tp; |
| 377 | |
| 378 | for (tp = thread_list; tp; tp = tp->next) |
| 379 | if (ptid_equal (tp->ptid, ptid)) |
| 380 | return tp->num; |
| 381 | |
| 382 | return 0; |
| 383 | } |
| 384 | |
| 385 | ptid_t |
| 386 | thread_id_to_pid (int num) |
| 387 | { |
| 388 | struct thread_info *thread = find_thread_id (num); |
| 389 | if (thread) |
| 390 | return thread->ptid; |
| 391 | else |
| 392 | return pid_to_ptid (-1); |
| 393 | } |
| 394 | |
| 395 | int |
| 396 | in_thread_list (ptid_t ptid) |
| 397 | { |
| 398 | struct thread_info *tp; |
| 399 | |
| 400 | for (tp = thread_list; tp; tp = tp->next) |
| 401 | if (ptid_equal (tp->ptid, ptid)) |
| 402 | return 1; |
| 403 | |
| 404 | return 0; /* Never heard of 'im */ |
| 405 | } |
| 406 | |
| 407 | /* Print a list of thread ids currently known, and the total number of |
| 408 | threads. To be used from within catch_errors. */ |
| 409 | static int |
| 410 | do_captured_list_thread_ids (struct ui_out *uiout, void *arg) |
| 411 | { |
| 412 | struct thread_info *tp; |
| 413 | int num = 0; |
| 414 | struct cleanup *cleanup_chain; |
| 415 | |
| 416 | prune_threads (); |
| 417 | target_find_new_threads (); |
| 418 | |
| 419 | cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids"); |
| 420 | |
| 421 | for (tp = thread_list; tp; tp = tp->next) |
| 422 | { |
| 423 | if (tp->state_ == THREAD_EXITED) |
| 424 | continue; |
| 425 | num++; |
| 426 | ui_out_field_int (uiout, "thread-id", tp->num); |
| 427 | } |
| 428 | |
| 429 | do_cleanups (cleanup_chain); |
| 430 | ui_out_field_int (uiout, "number-of-threads", num); |
| 431 | return GDB_RC_OK; |
| 432 | } |
| 433 | |
| 434 | /* Official gdblib interface function to get a list of thread ids and |
| 435 | the total number. */ |
| 436 | enum gdb_rc |
| 437 | gdb_list_thread_ids (struct ui_out *uiout, char **error_message) |
| 438 | { |
| 439 | if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL, |
| 440 | error_message, RETURN_MASK_ALL) < 0) |
| 441 | return GDB_RC_FAIL; |
| 442 | return GDB_RC_OK; |
| 443 | } |
| 444 | |
| 445 | /* Load infrun state for the thread PID. */ |
| 446 | |
| 447 | void |
| 448 | load_infrun_state (ptid_t ptid) |
| 449 | { |
| 450 | struct thread_info *tp; |
| 451 | |
| 452 | /* If we can't find the thread, then we're debugging a single threaded |
| 453 | process. No need to do anything in that case. */ |
| 454 | tp = find_thread_id (pid_to_thread_id (ptid)); |
| 455 | if (tp == NULL) |
| 456 | return; |
| 457 | } |
| 458 | |
| 459 | /* Save infrun state for the thread PID. */ |
| 460 | |
| 461 | void |
| 462 | save_infrun_state (ptid_t ptid) |
| 463 | { |
| 464 | struct thread_info *tp; |
| 465 | |
| 466 | /* If we can't find the thread, then we're debugging a single-threaded |
| 467 | process. Nothing to do in that case. */ |
| 468 | tp = find_thread_id (pid_to_thread_id (ptid)); |
| 469 | if (tp == NULL) |
| 470 | return; |
| 471 | } |
| 472 | |
| 473 | /* Return true if TP is an active thread. */ |
| 474 | static int |
| 475 | thread_alive (struct thread_info *tp) |
| 476 | { |
| 477 | if (tp->state_ == THREAD_EXITED) |
| 478 | return 0; |
| 479 | if (!target_thread_alive (tp->ptid)) |
| 480 | return 0; |
| 481 | return 1; |
| 482 | } |
| 483 | |
| 484 | static void |
| 485 | prune_threads (void) |
| 486 | { |
| 487 | struct thread_info *tp, *next; |
| 488 | |
| 489 | for (tp = thread_list; tp; tp = next) |
| 490 | { |
| 491 | next = tp->next; |
| 492 | if (!thread_alive (tp)) |
| 493 | delete_thread (tp->ptid); |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | void |
| 498 | thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid) |
| 499 | { |
| 500 | struct thread_info * tp = find_thread_pid (old_ptid); |
| 501 | tp->ptid = new_ptid; |
| 502 | |
| 503 | observer_notify_thread_ptid_changed (old_ptid, new_ptid); |
| 504 | } |
| 505 | |
| 506 | void |
| 507 | set_running (ptid_t ptid, int running) |
| 508 | { |
| 509 | struct thread_info *tp; |
| 510 | |
| 511 | if (!thread_list) |
| 512 | { |
| 513 | /* This is one of the targets that does not add main |
| 514 | thread to the thread list. Just use a single |
| 515 | global flag to indicate that a thread is running. |
| 516 | |
| 517 | This problem is unique to ST programs. For MT programs, |
| 518 | the main thread is always present in the thread list. If it's |
| 519 | not, the first call to context_switch will mess up GDB internal |
| 520 | state. */ |
| 521 | if (running |
| 522 | && main_thread_state != THREAD_RUNNING |
| 523 | && !suppress_resume_observer) |
| 524 | observer_notify_target_resumed (ptid); |
| 525 | main_thread_state = running ? THREAD_RUNNING : THREAD_STOPPED; |
| 526 | return; |
| 527 | } |
| 528 | |
| 529 | /* We try not to notify the observer if no thread has actually changed |
| 530 | the running state -- merely to reduce the number of messages to |
| 531 | frontend. Frontend is supposed to handle multiple *running just fine. */ |
| 532 | if (PIDGET (ptid) == -1) |
| 533 | { |
| 534 | int any_started = 0; |
| 535 | for (tp = thread_list; tp; tp = tp->next) |
| 536 | { |
| 537 | if (tp->state_ == THREAD_EXITED) |
| 538 | continue; |
| 539 | if (running && tp->state_ == THREAD_STOPPED) |
| 540 | any_started = 1; |
| 541 | tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED; |
| 542 | } |
| 543 | if (any_started && !suppress_resume_observer) |
| 544 | observer_notify_target_resumed (ptid); |
| 545 | } |
| 546 | else |
| 547 | { |
| 548 | int started = 0; |
| 549 | tp = find_thread_pid (ptid); |
| 550 | gdb_assert (tp); |
| 551 | gdb_assert (tp->state_ != THREAD_EXITED); |
| 552 | if (running && tp->state_ == THREAD_STOPPED) |
| 553 | started = 1; |
| 554 | tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED; |
| 555 | if (started && !suppress_resume_observer) |
| 556 | observer_notify_target_resumed (ptid); |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | static int |
| 561 | is_thread_state (ptid_t ptid, enum thread_state state) |
| 562 | { |
| 563 | struct thread_info *tp; |
| 564 | |
| 565 | if (!target_has_execution) |
| 566 | return 0; |
| 567 | |
| 568 | if (!thread_list) |
| 569 | return main_thread_state == state; |
| 570 | |
| 571 | tp = find_thread_pid (ptid); |
| 572 | gdb_assert (tp); |
| 573 | return tp->state_ == state; |
| 574 | } |
| 575 | |
| 576 | int |
| 577 | is_stopped (ptid_t ptid) |
| 578 | { |
| 579 | /* Without execution, this property is always true. */ |
| 580 | if (!target_has_execution) |
| 581 | return 1; |
| 582 | |
| 583 | return is_thread_state (ptid, THREAD_STOPPED); |
| 584 | } |
| 585 | |
| 586 | int |
| 587 | is_exited (ptid_t ptid) |
| 588 | { |
| 589 | /* Without execution, this property is always false. */ |
| 590 | if (!target_has_execution) |
| 591 | return 0; |
| 592 | |
| 593 | return is_thread_state (ptid, THREAD_EXITED); |
| 594 | } |
| 595 | |
| 596 | int |
| 597 | is_running (ptid_t ptid) |
| 598 | { |
| 599 | /* Without execution, this property is always false. */ |
| 600 | if (!target_has_execution) |
| 601 | return 0; |
| 602 | |
| 603 | return is_thread_state (ptid, THREAD_RUNNING); |
| 604 | } |
| 605 | |
| 606 | int |
| 607 | any_running (void) |
| 608 | { |
| 609 | struct thread_info *tp; |
| 610 | |
| 611 | if (!target_has_execution) |
| 612 | return 0; |
| 613 | |
| 614 | if (!thread_list) |
| 615 | return main_thread_state == THREAD_RUNNING; |
| 616 | |
| 617 | for (tp = thread_list; tp; tp = tp->next) |
| 618 | if (tp->state_ == THREAD_RUNNING) |
| 619 | return 1; |
| 620 | |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | int |
| 625 | is_executing (ptid_t ptid) |
| 626 | { |
| 627 | struct thread_info *tp; |
| 628 | |
| 629 | if (!target_has_execution) |
| 630 | return 0; |
| 631 | |
| 632 | if (!thread_list) |
| 633 | return main_thread_executing; |
| 634 | |
| 635 | tp = find_thread_pid (ptid); |
| 636 | gdb_assert (tp); |
| 637 | return tp->executing_; |
| 638 | } |
| 639 | |
| 640 | void |
| 641 | set_executing (ptid_t ptid, int executing) |
| 642 | { |
| 643 | struct thread_info *tp; |
| 644 | |
| 645 | if (!thread_list) |
| 646 | { |
| 647 | /* This target does not add the main thread to the thread list. |
| 648 | Use a global flag to indicate that the thread is |
| 649 | executing. */ |
| 650 | main_thread_executing = executing; |
| 651 | return; |
| 652 | } |
| 653 | |
| 654 | if (PIDGET (ptid) == -1) |
| 655 | { |
| 656 | for (tp = thread_list; tp; tp = tp->next) |
| 657 | tp->executing_ = executing; |
| 658 | } |
| 659 | else |
| 660 | { |
| 661 | tp = find_thread_pid (ptid); |
| 662 | gdb_assert (tp); |
| 663 | tp->executing_ = executing; |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | /* Prints the list of threads and their details on UIOUT. |
| 668 | This is a version of 'info_thread_command' suitable for |
| 669 | use from MI. |
| 670 | If REQUESTED_THREAD is not -1, it's the GDB id of the thread |
| 671 | that should be printed. Otherwise, all threads are |
| 672 | printed. */ |
| 673 | void |
| 674 | print_thread_info (struct ui_out *uiout, int requested_thread) |
| 675 | { |
| 676 | struct thread_info *tp; |
| 677 | ptid_t current_ptid; |
| 678 | struct cleanup *old_chain; |
| 679 | char *extra_info; |
| 680 | int current_thread = -1; |
| 681 | |
| 682 | prune_threads (); |
| 683 | target_find_new_threads (); |
| 684 | current_ptid = inferior_ptid; |
| 685 | |
| 686 | /* We'll be switching threads temporarily. */ |
| 687 | old_chain = make_cleanup_restore_current_thread (); |
| 688 | |
| 689 | make_cleanup_ui_out_list_begin_end (uiout, "threads"); |
| 690 | for (tp = thread_list; tp; tp = tp->next) |
| 691 | { |
| 692 | struct cleanup *chain2; |
| 693 | |
| 694 | if (requested_thread != -1 && tp->num != requested_thread) |
| 695 | continue; |
| 696 | |
| 697 | if (ptid_equal (tp->ptid, current_ptid)) |
| 698 | current_thread = tp->num; |
| 699 | |
| 700 | if (tp->state_ == THREAD_EXITED) |
| 701 | continue; |
| 702 | |
| 703 | chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); |
| 704 | |
| 705 | if (ptid_equal (tp->ptid, current_ptid)) |
| 706 | ui_out_text (uiout, "* "); |
| 707 | else |
| 708 | ui_out_text (uiout, " "); |
| 709 | |
| 710 | ui_out_field_int (uiout, "id", tp->num); |
| 711 | ui_out_text (uiout, " "); |
| 712 | ui_out_field_string (uiout, "target-id", target_tid_to_str (tp->ptid)); |
| 713 | |
| 714 | if (tp->state_ != THREAD_EXITED) |
| 715 | { |
| 716 | extra_info = target_extra_thread_info (tp); |
| 717 | if (extra_info) |
| 718 | { |
| 719 | ui_out_text (uiout, " ("); |
| 720 | ui_out_field_string (uiout, "details", extra_info); |
| 721 | ui_out_text (uiout, ")"); |
| 722 | } |
| 723 | ui_out_text (uiout, " "); |
| 724 | } |
| 725 | |
| 726 | if (tp->state_ == THREAD_RUNNING) |
| 727 | ui_out_text (uiout, "(running)\n"); |
| 728 | else |
| 729 | { |
| 730 | /* The switch below puts us at the top of the stack (leaf |
| 731 | frame). */ |
| 732 | switch_to_thread (tp->ptid); |
| 733 | print_stack_frame (get_selected_frame (NULL), |
| 734 | /* For MI output, print frame level. */ |
| 735 | ui_out_is_mi_like_p (uiout), |
| 736 | LOCATION); |
| 737 | } |
| 738 | |
| 739 | if (ui_out_is_mi_like_p (uiout)) |
| 740 | { |
| 741 | char *state = "stopped"; |
| 742 | if (tp->state_ == THREAD_EXITED) |
| 743 | state = "exited"; |
| 744 | else if (tp->state_ == THREAD_RUNNING) |
| 745 | state = "running"; |
| 746 | ui_out_field_string (uiout, "state", state); |
| 747 | } |
| 748 | |
| 749 | do_cleanups (chain2); |
| 750 | } |
| 751 | |
| 752 | /* Restores the current thread and the frame selected before |
| 753 | the "info threads" command. */ |
| 754 | do_cleanups (old_chain); |
| 755 | |
| 756 | if (requested_thread == -1) |
| 757 | { |
| 758 | gdb_assert (current_thread != -1 |
| 759 | || !thread_list); |
| 760 | if (current_thread != -1 && ui_out_is_mi_like_p (uiout)) |
| 761 | ui_out_field_int (uiout, "current-thread-id", current_thread); |
| 762 | |
| 763 | if (current_thread != -1 && is_exited (current_ptid)) |
| 764 | ui_out_message (uiout, 0, "\n\ |
| 765 | The current thread <Thread ID %d> has terminated. See `help thread'.\n", |
| 766 | current_thread); |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | |
| 771 | /* Print information about currently known threads |
| 772 | |
| 773 | * Note: this has the drawback that it _really_ switches |
| 774 | * threads, which frees the frame cache. A no-side |
| 775 | * effects info-threads command would be nicer. |
| 776 | */ |
| 777 | |
| 778 | static void |
| 779 | info_threads_command (char *arg, int from_tty) |
| 780 | { |
| 781 | print_thread_info (uiout, -1); |
| 782 | } |
| 783 | |
| 784 | /* Switch from one thread to another. */ |
| 785 | |
| 786 | void |
| 787 | switch_to_thread (ptid_t ptid) |
| 788 | { |
| 789 | if (ptid_equal (ptid, inferior_ptid)) |
| 790 | return; |
| 791 | |
| 792 | inferior_ptid = ptid; |
| 793 | reinit_frame_cache (); |
| 794 | registers_changed (); |
| 795 | |
| 796 | /* We don't check for is_stopped, because we're called at times |
| 797 | while in the TARGET_RUNNING state, e.g., while handling an |
| 798 | internal event. */ |
| 799 | if (!is_exited (ptid) && !is_executing (ptid)) |
| 800 | stop_pc = read_pc (); |
| 801 | else |
| 802 | stop_pc = ~(CORE_ADDR) 0; |
| 803 | } |
| 804 | |
| 805 | static void |
| 806 | restore_current_thread (ptid_t ptid) |
| 807 | { |
| 808 | if (!ptid_equal (ptid, inferior_ptid)) |
| 809 | { |
| 810 | if (non_stop) |
| 811 | context_switch_to (ptid); |
| 812 | else |
| 813 | switch_to_thread (ptid); |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | static void |
| 818 | restore_selected_frame (struct frame_id a_frame_id, int frame_level) |
| 819 | { |
| 820 | struct frame_info *frame = NULL; |
| 821 | int count; |
| 822 | |
| 823 | gdb_assert (frame_level >= 0); |
| 824 | |
| 825 | /* Restore by level first, check if the frame id is the same as |
| 826 | expected. If that fails, try restoring by frame id. If that |
| 827 | fails, nothing to do, just warn the user. */ |
| 828 | |
| 829 | count = frame_level; |
| 830 | frame = find_relative_frame (get_current_frame (), &count); |
| 831 | if (count == 0 |
| 832 | && frame != NULL |
| 833 | /* Either the frame ids match, of they're both invalid. The |
| 834 | latter case is not failsafe, but since it's highly unlikely |
| 835 | the search by level finds the wrong frame, it's 99.9(9)% of |
| 836 | the time (for all practical purposes) safe. */ |
| 837 | && (frame_id_eq (get_frame_id (frame), a_frame_id) |
| 838 | /* Note: could be better to check every frame_id |
| 839 | member for equality here. */ |
| 840 | || (!frame_id_p (get_frame_id (frame)) |
| 841 | && !frame_id_p (a_frame_id)))) |
| 842 | { |
| 843 | /* Cool, all is fine. */ |
| 844 | select_frame (frame); |
| 845 | return; |
| 846 | } |
| 847 | |
| 848 | frame = frame_find_by_id (a_frame_id); |
| 849 | if (frame != NULL) |
| 850 | { |
| 851 | /* Cool, refound it. */ |
| 852 | select_frame (frame); |
| 853 | return; |
| 854 | } |
| 855 | |
| 856 | /* Nothing else to do, the frame layout really changed. Select the |
| 857 | innermost stack frame. */ |
| 858 | select_frame (get_current_frame ()); |
| 859 | |
| 860 | /* Warn the user. */ |
| 861 | if (!ui_out_is_mi_like_p (uiout)) |
| 862 | { |
| 863 | warning (_("\ |
| 864 | Couldn't restore frame #%d in current thread, at reparsed frame #0\n"), |
| 865 | frame_level); |
| 866 | /* For MI, we should probably have a notification about |
| 867 | current frame change. But this error is not very |
| 868 | likely, so don't bother for now. */ |
| 869 | print_stack_frame (get_selected_frame (NULL), 1, SRC_LINE); |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | struct current_thread_cleanup |
| 874 | { |
| 875 | ptid_t inferior_ptid; |
| 876 | struct frame_id selected_frame_id; |
| 877 | int selected_frame_level; |
| 878 | int was_stopped; |
| 879 | }; |
| 880 | |
| 881 | static void |
| 882 | do_restore_current_thread_cleanup (void *arg) |
| 883 | { |
| 884 | struct thread_info *tp; |
| 885 | struct current_thread_cleanup *old = arg; |
| 886 | restore_current_thread (old->inferior_ptid); |
| 887 | |
| 888 | /* The running state of the originally selected thread may have |
| 889 | changed, so we have to recheck it here. */ |
| 890 | if (old->was_stopped |
| 891 | && is_stopped (inferior_ptid) |
| 892 | && target_has_registers |
| 893 | && target_has_stack |
| 894 | && target_has_memory) |
| 895 | restore_selected_frame (old->selected_frame_id, |
| 896 | old->selected_frame_level); |
| 897 | } |
| 898 | |
| 899 | static void |
| 900 | restore_current_thread_cleanup_dtor (void *arg) |
| 901 | { |
| 902 | struct current_thread_cleanup *old = arg; |
| 903 | struct thread_info *tp; |
| 904 | tp = find_thread_pid (old->inferior_ptid); |
| 905 | if (tp) |
| 906 | tp->refcount--; |
| 907 | xfree (old); |
| 908 | } |
| 909 | |
| 910 | struct cleanup * |
| 911 | make_cleanup_restore_current_thread (void) |
| 912 | { |
| 913 | struct thread_info *tp; |
| 914 | struct frame_info *frame; |
| 915 | struct current_thread_cleanup *old; |
| 916 | |
| 917 | old = xmalloc (sizeof (struct current_thread_cleanup)); |
| 918 | old->inferior_ptid = inferior_ptid; |
| 919 | old->was_stopped = is_stopped (inferior_ptid); |
| 920 | if (old->was_stopped |
| 921 | && target_has_registers |
| 922 | && target_has_stack |
| 923 | && target_has_memory) |
| 924 | frame = get_selected_frame (NULL); |
| 925 | else |
| 926 | frame = NULL; |
| 927 | |
| 928 | old->selected_frame_id = get_frame_id (frame); |
| 929 | old->selected_frame_level = frame_relative_level (frame); |
| 930 | |
| 931 | tp = find_thread_pid (inferior_ptid); |
| 932 | if (tp) |
| 933 | tp->refcount++; |
| 934 | |
| 935 | return make_cleanup_dtor (do_restore_current_thread_cleanup, old, |
| 936 | restore_current_thread_cleanup_dtor); |
| 937 | } |
| 938 | |
| 939 | /* Apply a GDB command to a list of threads. List syntax is a whitespace |
| 940 | seperated list of numbers, or ranges, or the keyword `all'. Ranges consist |
| 941 | of two numbers seperated by a hyphen. Examples: |
| 942 | |
| 943 | thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4 |
| 944 | thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9 |
| 945 | thread apply all p x/i $pc Apply x/i $pc cmd to all threads |
| 946 | */ |
| 947 | |
| 948 | static void |
| 949 | thread_apply_all_command (char *cmd, int from_tty) |
| 950 | { |
| 951 | struct thread_info *tp; |
| 952 | struct cleanup *old_chain; |
| 953 | char *saved_cmd; |
| 954 | |
| 955 | if (cmd == NULL || *cmd == '\000') |
| 956 | error (_("Please specify a command following the thread ID list")); |
| 957 | |
| 958 | prune_threads (); |
| 959 | target_find_new_threads (); |
| 960 | |
| 961 | old_chain = make_cleanup_restore_current_thread (); |
| 962 | |
| 963 | /* Save a copy of the command in case it is clobbered by |
| 964 | execute_command */ |
| 965 | saved_cmd = xstrdup (cmd); |
| 966 | make_cleanup (xfree, saved_cmd); |
| 967 | for (tp = thread_list; tp; tp = tp->next) |
| 968 | if (thread_alive (tp)) |
| 969 | { |
| 970 | if (non_stop) |
| 971 | context_switch_to (tp->ptid); |
| 972 | else |
| 973 | switch_to_thread (tp->ptid); |
| 974 | |
| 975 | printf_filtered (_("\nThread %d (%s):\n"), |
| 976 | tp->num, target_tid_to_str (inferior_ptid)); |
| 977 | execute_command (cmd, from_tty); |
| 978 | strcpy (cmd, saved_cmd); /* Restore exact command used previously */ |
| 979 | } |
| 980 | |
| 981 | do_cleanups (old_chain); |
| 982 | } |
| 983 | |
| 984 | static void |
| 985 | thread_apply_command (char *tidlist, int from_tty) |
| 986 | { |
| 987 | char *cmd; |
| 988 | char *p; |
| 989 | struct cleanup *old_chain; |
| 990 | char *saved_cmd; |
| 991 | |
| 992 | if (tidlist == NULL || *tidlist == '\000') |
| 993 | error (_("Please specify a thread ID list")); |
| 994 | |
| 995 | for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++); |
| 996 | |
| 997 | if (*cmd == '\000') |
| 998 | error (_("Please specify a command following the thread ID list")); |
| 999 | |
| 1000 | /* Save a copy of the command in case it is clobbered by |
| 1001 | execute_command */ |
| 1002 | saved_cmd = xstrdup (cmd); |
| 1003 | old_chain = make_cleanup (xfree, saved_cmd); |
| 1004 | while (tidlist < cmd) |
| 1005 | { |
| 1006 | struct thread_info *tp; |
| 1007 | int start, end; |
| 1008 | |
| 1009 | start = strtol (tidlist, &p, 10); |
| 1010 | if (p == tidlist) |
| 1011 | error (_("Error parsing %s"), tidlist); |
| 1012 | tidlist = p; |
| 1013 | |
| 1014 | while (*tidlist == ' ' || *tidlist == '\t') |
| 1015 | tidlist++; |
| 1016 | |
| 1017 | if (*tidlist == '-') /* Got a range of IDs? */ |
| 1018 | { |
| 1019 | tidlist++; /* Skip the - */ |
| 1020 | end = strtol (tidlist, &p, 10); |
| 1021 | if (p == tidlist) |
| 1022 | error (_("Error parsing %s"), tidlist); |
| 1023 | tidlist = p; |
| 1024 | |
| 1025 | while (*tidlist == ' ' || *tidlist == '\t') |
| 1026 | tidlist++; |
| 1027 | } |
| 1028 | else |
| 1029 | end = start; |
| 1030 | |
| 1031 | make_cleanup_restore_current_thread (); |
| 1032 | |
| 1033 | for (; start <= end; start++) |
| 1034 | { |
| 1035 | tp = find_thread_id (start); |
| 1036 | |
| 1037 | if (!tp) |
| 1038 | warning (_("Unknown thread %d."), start); |
| 1039 | else if (!thread_alive (tp)) |
| 1040 | warning (_("Thread %d has terminated."), start); |
| 1041 | else |
| 1042 | { |
| 1043 | if (non_stop) |
| 1044 | context_switch_to (tp->ptid); |
| 1045 | else |
| 1046 | switch_to_thread (tp->ptid); |
| 1047 | |
| 1048 | printf_filtered (_("\nThread %d (%s):\n"), tp->num, |
| 1049 | target_tid_to_str (inferior_ptid)); |
| 1050 | execute_command (cmd, from_tty); |
| 1051 | |
| 1052 | /* Restore exact command used previously. */ |
| 1053 | strcpy (cmd, saved_cmd); |
| 1054 | } |
| 1055 | } |
| 1056 | } |
| 1057 | |
| 1058 | do_cleanups (old_chain); |
| 1059 | } |
| 1060 | |
| 1061 | /* Switch to the specified thread. Will dispatch off to thread_apply_command |
| 1062 | if prefix of arg is `apply'. */ |
| 1063 | |
| 1064 | static void |
| 1065 | thread_command (char *tidstr, int from_tty) |
| 1066 | { |
| 1067 | if (!tidstr) |
| 1068 | { |
| 1069 | if (target_has_stack) |
| 1070 | { |
| 1071 | if (is_exited (inferior_ptid)) |
| 1072 | printf_filtered (_("[Current thread is %d (%s) (exited)]\n"), |
| 1073 | pid_to_thread_id (inferior_ptid), |
| 1074 | target_tid_to_str (inferior_ptid)); |
| 1075 | else |
| 1076 | printf_filtered (_("[Current thread is %d (%s)]\n"), |
| 1077 | pid_to_thread_id (inferior_ptid), |
| 1078 | target_tid_to_str (inferior_ptid)); |
| 1079 | } |
| 1080 | else |
| 1081 | error (_("No stack.")); |
| 1082 | return; |
| 1083 | } |
| 1084 | |
| 1085 | annotate_thread_changed (); |
| 1086 | gdb_thread_select (uiout, tidstr, NULL); |
| 1087 | } |
| 1088 | |
| 1089 | /* Print notices when new threads are attached and detached. */ |
| 1090 | int print_thread_events = 1; |
| 1091 | static void |
| 1092 | show_print_thread_events (struct ui_file *file, int from_tty, |
| 1093 | struct cmd_list_element *c, const char *value) |
| 1094 | { |
| 1095 | fprintf_filtered (file, _("\ |
| 1096 | Printing of thread events is %s.\n"), |
| 1097 | value); |
| 1098 | } |
| 1099 | |
| 1100 | static int |
| 1101 | do_captured_thread_select (struct ui_out *uiout, void *tidstr) |
| 1102 | { |
| 1103 | int num; |
| 1104 | struct thread_info *tp; |
| 1105 | |
| 1106 | num = value_as_long (parse_and_eval (tidstr)); |
| 1107 | |
| 1108 | tp = find_thread_id (num); |
| 1109 | |
| 1110 | if (!tp) |
| 1111 | error (_("Thread ID %d not known."), num); |
| 1112 | |
| 1113 | if (!thread_alive (tp)) |
| 1114 | error (_("Thread ID %d has terminated."), num); |
| 1115 | |
| 1116 | if (non_stop) |
| 1117 | context_switch_to (tp->ptid); |
| 1118 | else |
| 1119 | switch_to_thread (tp->ptid); |
| 1120 | |
| 1121 | ui_out_text (uiout, "[Switching to thread "); |
| 1122 | ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid)); |
| 1123 | ui_out_text (uiout, " ("); |
| 1124 | ui_out_text (uiout, target_tid_to_str (inferior_ptid)); |
| 1125 | ui_out_text (uiout, ")]"); |
| 1126 | |
| 1127 | /* Note that we can't reach this with an exited thread, due to the |
| 1128 | thread_alive check above. */ |
| 1129 | if (tp->state_ == THREAD_RUNNING) |
| 1130 | ui_out_text (uiout, "(running)\n"); |
| 1131 | else |
| 1132 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| 1133 | |
| 1134 | /* Since the current thread may have changed, see if there is any |
| 1135 | exited thread we can now delete. */ |
| 1136 | prune_threads (); |
| 1137 | |
| 1138 | return GDB_RC_OK; |
| 1139 | } |
| 1140 | |
| 1141 | enum gdb_rc |
| 1142 | gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message) |
| 1143 | { |
| 1144 | if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr, |
| 1145 | error_message, RETURN_MASK_ALL) < 0) |
| 1146 | return GDB_RC_FAIL; |
| 1147 | return GDB_RC_OK; |
| 1148 | } |
| 1149 | |
| 1150 | /* Commands with a prefix of `thread'. */ |
| 1151 | struct cmd_list_element *thread_cmd_list = NULL; |
| 1152 | |
| 1153 | void |
| 1154 | _initialize_thread (void) |
| 1155 | { |
| 1156 | static struct cmd_list_element *thread_apply_list = NULL; |
| 1157 | struct cmd_list_element *c; |
| 1158 | |
| 1159 | c = add_info ("threads", info_threads_command, |
| 1160 | _("IDs of currently known threads.")); |
| 1161 | set_cmd_no_selected_thread_ok (c); |
| 1162 | |
| 1163 | c = add_prefix_cmd ("thread", class_run, thread_command, _("\ |
| 1164 | Use this command to switch between threads.\n\ |
| 1165 | The new thread ID must be currently known."), |
| 1166 | &thread_cmd_list, "thread ", 1, &cmdlist); |
| 1167 | set_cmd_no_selected_thread_ok (c); |
| 1168 | |
| 1169 | c = add_prefix_cmd ("apply", class_run, thread_apply_command, |
| 1170 | _("Apply a command to a list of threads."), |
| 1171 | &thread_apply_list, "thread apply ", 1, &thread_cmd_list); |
| 1172 | set_cmd_no_selected_thread_ok (c); |
| 1173 | |
| 1174 | c = add_cmd ("all", class_run, thread_apply_all_command, |
| 1175 | _("Apply a command to all threads."), &thread_apply_list); |
| 1176 | set_cmd_no_selected_thread_ok (c); |
| 1177 | |
| 1178 | if (!xdb_commands) |
| 1179 | add_com_alias ("t", "thread", class_run, 1); |
| 1180 | |
| 1181 | add_setshow_boolean_cmd ("thread-events", no_class, |
| 1182 | &print_thread_events, _("\ |
| 1183 | Set printing of thread events (such as thread start and exit)."), _("\ |
| 1184 | Show printing of thread events (such as thread start and exit)."), NULL, |
| 1185 | NULL, |
| 1186 | show_print_thread_events, |
| 1187 | &setprintlist, &showprintlist); |
| 1188 | } |