| 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 | |
| 45 | #include "cli/cli-decode.h" |
| 46 | |
| 47 | /* Definition of struct thread_info exported to gdbthread.h */ |
| 48 | |
| 49 | /* Prototypes for exported functions. */ |
| 50 | |
| 51 | void _initialize_thread (void); |
| 52 | |
| 53 | /* Prototypes for local functions. */ |
| 54 | |
| 55 | static struct thread_info *thread_list = NULL; |
| 56 | static int highest_thread_num; |
| 57 | |
| 58 | static struct thread_info *find_thread_id (int num); |
| 59 | |
| 60 | static void thread_command (char *tidstr, int from_tty); |
| 61 | static void thread_apply_all_command (char *, int); |
| 62 | static int thread_alive (struct thread_info *); |
| 63 | static void info_threads_command (char *, int); |
| 64 | static void thread_apply_command (char *, int); |
| 65 | static void restore_current_thread (ptid_t); |
| 66 | static void prune_threads (void); |
| 67 | |
| 68 | static int main_thread_running = 0; |
| 69 | static int main_thread_executing = 0; |
| 70 | |
| 71 | void |
| 72 | delete_step_resume_breakpoint (void *arg) |
| 73 | { |
| 74 | struct breakpoint **breakpointp = (struct breakpoint **) arg; |
| 75 | struct thread_info *tp; |
| 76 | |
| 77 | if (*breakpointp != NULL) |
| 78 | { |
| 79 | delete_breakpoint (*breakpointp); |
| 80 | for (tp = thread_list; tp; tp = tp->next) |
| 81 | if (tp->step_resume_breakpoint == *breakpointp) |
| 82 | tp->step_resume_breakpoint = NULL; |
| 83 | |
| 84 | *breakpointp = NULL; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | static void |
| 89 | free_thread (struct thread_info *tp) |
| 90 | { |
| 91 | /* NOTE: this will take care of any left-over step_resume breakpoints, |
| 92 | but not any user-specified thread-specific breakpoints. We can not |
| 93 | delete the breakpoint straight-off, because the inferior might not |
| 94 | be stopped at the moment. */ |
| 95 | if (tp->step_resume_breakpoint) |
| 96 | tp->step_resume_breakpoint->disposition = disp_del_at_next_stop; |
| 97 | |
| 98 | bpstat_clear (&tp->stop_bpstat); |
| 99 | |
| 100 | /* FIXME: do I ever need to call the back-end to give it a |
| 101 | chance at this private data before deleting the thread? */ |
| 102 | if (tp->private) |
| 103 | xfree (tp->private); |
| 104 | |
| 105 | xfree (tp); |
| 106 | } |
| 107 | |
| 108 | void |
| 109 | init_thread_list (void) |
| 110 | { |
| 111 | struct thread_info *tp, *tpnext; |
| 112 | |
| 113 | highest_thread_num = 0; |
| 114 | main_thread_running = 0; |
| 115 | main_thread_executing = 0; |
| 116 | |
| 117 | if (!thread_list) |
| 118 | return; |
| 119 | |
| 120 | for (tp = thread_list; tp; tp = tpnext) |
| 121 | { |
| 122 | tpnext = tp->next; |
| 123 | free_thread (tp); |
| 124 | } |
| 125 | |
| 126 | thread_list = NULL; |
| 127 | } |
| 128 | |
| 129 | struct thread_info * |
| 130 | add_thread_silent (ptid_t ptid) |
| 131 | { |
| 132 | struct thread_info *tp; |
| 133 | |
| 134 | tp = (struct thread_info *) xmalloc (sizeof (*tp)); |
| 135 | memset (tp, 0, sizeof (*tp)); |
| 136 | tp->ptid = ptid; |
| 137 | tp->num = ++highest_thread_num; |
| 138 | tp->next = thread_list; |
| 139 | thread_list = tp; |
| 140 | |
| 141 | observer_notify_new_thread (tp); |
| 142 | |
| 143 | return tp; |
| 144 | } |
| 145 | |
| 146 | struct thread_info * |
| 147 | add_thread_with_info (ptid_t ptid, struct private_thread_info *private) |
| 148 | { |
| 149 | struct thread_info *result = add_thread_silent (ptid); |
| 150 | |
| 151 | result->private = private; |
| 152 | |
| 153 | if (print_thread_events) |
| 154 | printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid)); |
| 155 | |
| 156 | annotate_new_thread (); |
| 157 | return result; |
| 158 | } |
| 159 | |
| 160 | struct thread_info * |
| 161 | add_thread (ptid_t ptid) |
| 162 | { |
| 163 | return add_thread_with_info (ptid, NULL); |
| 164 | } |
| 165 | |
| 166 | /* Delete thread PTID. If SILENT, don't notify the observer of this |
| 167 | exit. */ |
| 168 | static void |
| 169 | delete_thread_1 (ptid_t ptid, int silent) |
| 170 | { |
| 171 | struct thread_info *tp, *tpprev; |
| 172 | |
| 173 | tpprev = NULL; |
| 174 | |
| 175 | for (tp = thread_list; tp; tpprev = tp, tp = tp->next) |
| 176 | if (ptid_equal (tp->ptid, ptid)) |
| 177 | break; |
| 178 | |
| 179 | if (!tp) |
| 180 | return; |
| 181 | |
| 182 | if (tpprev) |
| 183 | tpprev->next = tp->next; |
| 184 | else |
| 185 | thread_list = tp->next; |
| 186 | |
| 187 | if (!silent) |
| 188 | observer_notify_thread_exit (tp); |
| 189 | |
| 190 | free_thread (tp); |
| 191 | } |
| 192 | |
| 193 | void |
| 194 | delete_thread (ptid_t ptid) |
| 195 | { |
| 196 | delete_thread_1 (ptid, 0 /* not silent */); |
| 197 | } |
| 198 | |
| 199 | void |
| 200 | delete_thread_silent (ptid_t ptid) |
| 201 | { |
| 202 | delete_thread_1 (ptid, 1 /* silent */); |
| 203 | } |
| 204 | |
| 205 | static struct thread_info * |
| 206 | find_thread_id (int num) |
| 207 | { |
| 208 | struct thread_info *tp; |
| 209 | |
| 210 | for (tp = thread_list; tp; tp = tp->next) |
| 211 | if (tp->num == num) |
| 212 | return tp; |
| 213 | |
| 214 | return NULL; |
| 215 | } |
| 216 | |
| 217 | /* Find a thread_info by matching PTID. */ |
| 218 | struct thread_info * |
| 219 | find_thread_pid (ptid_t ptid) |
| 220 | { |
| 221 | struct thread_info *tp; |
| 222 | |
| 223 | for (tp = thread_list; tp; tp = tp->next) |
| 224 | if (ptid_equal (tp->ptid, ptid)) |
| 225 | return tp; |
| 226 | |
| 227 | return NULL; |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Thread iterator function. |
| 232 | * |
| 233 | * Calls a callback function once for each thread, so long as |
| 234 | * the callback function returns false. If the callback function |
| 235 | * returns true, the iteration will end and the current thread |
| 236 | * will be returned. This can be useful for implementing a |
| 237 | * search for a thread with arbitrary attributes, or for applying |
| 238 | * some operation to every thread. |
| 239 | * |
| 240 | * FIXME: some of the existing functionality, such as |
| 241 | * "Thread apply all", might be rewritten using this functionality. |
| 242 | */ |
| 243 | |
| 244 | struct thread_info * |
| 245 | iterate_over_threads (int (*callback) (struct thread_info *, void *), |
| 246 | void *data) |
| 247 | { |
| 248 | struct thread_info *tp; |
| 249 | |
| 250 | for (tp = thread_list; tp; tp = tp->next) |
| 251 | if ((*callback) (tp, data)) |
| 252 | return tp; |
| 253 | |
| 254 | return NULL; |
| 255 | } |
| 256 | |
| 257 | int |
| 258 | thread_count (void) |
| 259 | { |
| 260 | int result = 0; |
| 261 | struct thread_info *tp; |
| 262 | |
| 263 | for (tp = thread_list; tp; tp = tp->next) |
| 264 | ++result; |
| 265 | |
| 266 | return result; |
| 267 | } |
| 268 | |
| 269 | int |
| 270 | valid_thread_id (int num) |
| 271 | { |
| 272 | struct thread_info *tp; |
| 273 | |
| 274 | for (tp = thread_list; tp; tp = tp->next) |
| 275 | if (tp->num == num) |
| 276 | return 1; |
| 277 | |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | int |
| 282 | pid_to_thread_id (ptid_t ptid) |
| 283 | { |
| 284 | struct thread_info *tp; |
| 285 | |
| 286 | for (tp = thread_list; tp; tp = tp->next) |
| 287 | if (ptid_equal (tp->ptid, ptid)) |
| 288 | return tp->num; |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | ptid_t |
| 294 | thread_id_to_pid (int num) |
| 295 | { |
| 296 | struct thread_info *thread = find_thread_id (num); |
| 297 | if (thread) |
| 298 | return thread->ptid; |
| 299 | else |
| 300 | return pid_to_ptid (-1); |
| 301 | } |
| 302 | |
| 303 | int |
| 304 | in_thread_list (ptid_t ptid) |
| 305 | { |
| 306 | struct thread_info *tp; |
| 307 | |
| 308 | for (tp = thread_list; tp; tp = tp->next) |
| 309 | if (ptid_equal (tp->ptid, ptid)) |
| 310 | return 1; |
| 311 | |
| 312 | return 0; /* Never heard of 'im */ |
| 313 | } |
| 314 | |
| 315 | /* Print a list of thread ids currently known, and the total number of |
| 316 | threads. To be used from within catch_errors. */ |
| 317 | static int |
| 318 | do_captured_list_thread_ids (struct ui_out *uiout, void *arg) |
| 319 | { |
| 320 | struct thread_info *tp; |
| 321 | int num = 0; |
| 322 | struct cleanup *cleanup_chain; |
| 323 | |
| 324 | prune_threads (); |
| 325 | target_find_new_threads (); |
| 326 | |
| 327 | cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids"); |
| 328 | |
| 329 | for (tp = thread_list; tp; tp = tp->next) |
| 330 | { |
| 331 | num++; |
| 332 | ui_out_field_int (uiout, "thread-id", tp->num); |
| 333 | } |
| 334 | |
| 335 | do_cleanups (cleanup_chain); |
| 336 | ui_out_field_int (uiout, "number-of-threads", num); |
| 337 | return GDB_RC_OK; |
| 338 | } |
| 339 | |
| 340 | /* Official gdblib interface function to get a list of thread ids and |
| 341 | the total number. */ |
| 342 | enum gdb_rc |
| 343 | gdb_list_thread_ids (struct ui_out *uiout, char **error_message) |
| 344 | { |
| 345 | if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL, |
| 346 | error_message, RETURN_MASK_ALL) < 0) |
| 347 | return GDB_RC_FAIL; |
| 348 | return GDB_RC_OK; |
| 349 | } |
| 350 | |
| 351 | /* Load infrun state for the thread PID. */ |
| 352 | |
| 353 | void |
| 354 | load_infrun_state (ptid_t ptid, |
| 355 | CORE_ADDR *prev_pc, |
| 356 | int *trap_expected, |
| 357 | struct breakpoint **step_resume_breakpoint, |
| 358 | CORE_ADDR *step_range_start, |
| 359 | CORE_ADDR *step_range_end, |
| 360 | struct frame_id *step_frame_id, |
| 361 | int *stepping_over_breakpoint, |
| 362 | int *stepping_through_solib_after_catch, |
| 363 | bpstat *stepping_through_solib_catchpoints, |
| 364 | int *current_line, |
| 365 | struct symtab **current_symtab, |
| 366 | struct continuation **continuations, |
| 367 | struct continuation **intermediate_continuations, |
| 368 | int *proceed_to_finish, |
| 369 | enum step_over_calls_kind *step_over_calls, |
| 370 | int *stop_step, |
| 371 | int *step_multi, |
| 372 | enum target_signal *stop_signal, |
| 373 | bpstat *stop_bpstat) |
| 374 | { |
| 375 | struct thread_info *tp; |
| 376 | |
| 377 | /* If we can't find the thread, then we're debugging a single threaded |
| 378 | process. No need to do anything in that case. */ |
| 379 | tp = find_thread_id (pid_to_thread_id (ptid)); |
| 380 | if (tp == NULL) |
| 381 | return; |
| 382 | |
| 383 | *prev_pc = tp->prev_pc; |
| 384 | *trap_expected = tp->trap_expected; |
| 385 | *step_resume_breakpoint = tp->step_resume_breakpoint; |
| 386 | *step_range_start = tp->step_range_start; |
| 387 | *step_range_end = tp->step_range_end; |
| 388 | *step_frame_id = tp->step_frame_id; |
| 389 | *stepping_over_breakpoint = tp->stepping_over_breakpoint; |
| 390 | *stepping_through_solib_after_catch = |
| 391 | tp->stepping_through_solib_after_catch; |
| 392 | *stepping_through_solib_catchpoints = |
| 393 | tp->stepping_through_solib_catchpoints; |
| 394 | *current_line = tp->current_line; |
| 395 | *current_symtab = tp->current_symtab; |
| 396 | |
| 397 | /* In all-stop mode, these are global state, while in non-stop mode, |
| 398 | they are per thread. */ |
| 399 | if (non_stop) |
| 400 | { |
| 401 | *continuations = tp->continuations; |
| 402 | tp->continuations = NULL; |
| 403 | *intermediate_continuations = tp->intermediate_continuations; |
| 404 | tp->intermediate_continuations = NULL; |
| 405 | *proceed_to_finish = tp->proceed_to_finish; |
| 406 | *step_over_calls = tp->step_over_calls; |
| 407 | *stop_step = tp->stop_step; |
| 408 | *step_multi = tp->step_multi; |
| 409 | *stop_signal = tp->stop_signal; |
| 410 | |
| 411 | /* Swap instead of copy, so we only have to update one of |
| 412 | them. */ |
| 413 | *stop_bpstat = tp->stop_bpstat; |
| 414 | tp->stop_bpstat = 0; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /* Save infrun state for the thread PID. */ |
| 419 | |
| 420 | void |
| 421 | save_infrun_state (ptid_t ptid, |
| 422 | CORE_ADDR prev_pc, |
| 423 | int trap_expected, |
| 424 | struct breakpoint *step_resume_breakpoint, |
| 425 | CORE_ADDR step_range_start, |
| 426 | CORE_ADDR step_range_end, |
| 427 | const struct frame_id *step_frame_id, |
| 428 | int stepping_over_breakpoint, |
| 429 | int stepping_through_solib_after_catch, |
| 430 | bpstat stepping_through_solib_catchpoints, |
| 431 | int current_line, |
| 432 | struct symtab *current_symtab, |
| 433 | struct continuation *continuations, |
| 434 | struct continuation *intermediate_continuations, |
| 435 | int proceed_to_finish, |
| 436 | enum step_over_calls_kind step_over_calls, |
| 437 | int stop_step, |
| 438 | int step_multi, |
| 439 | enum target_signal stop_signal, |
| 440 | bpstat stop_bpstat) |
| 441 | { |
| 442 | struct thread_info *tp; |
| 443 | |
| 444 | /* If we can't find the thread, then we're debugging a single-threaded |
| 445 | process. Nothing to do in that case. */ |
| 446 | tp = find_thread_id (pid_to_thread_id (ptid)); |
| 447 | if (tp == NULL) |
| 448 | return; |
| 449 | |
| 450 | tp->prev_pc = prev_pc; |
| 451 | tp->trap_expected = trap_expected; |
| 452 | tp->step_resume_breakpoint = step_resume_breakpoint; |
| 453 | tp->step_range_start = step_range_start; |
| 454 | tp->step_range_end = step_range_end; |
| 455 | tp->step_frame_id = (*step_frame_id); |
| 456 | tp->stepping_over_breakpoint = stepping_over_breakpoint; |
| 457 | tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch; |
| 458 | tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints; |
| 459 | tp->current_line = current_line; |
| 460 | tp->current_symtab = current_symtab; |
| 461 | |
| 462 | /* In all-stop mode, these are global state, while in non-stop mode, |
| 463 | they are per thread. */ |
| 464 | if (non_stop) |
| 465 | { |
| 466 | tp->continuations = continuations; |
| 467 | tp->intermediate_continuations = intermediate_continuations; |
| 468 | tp->proceed_to_finish = proceed_to_finish; |
| 469 | tp->step_over_calls = step_over_calls; |
| 470 | tp->stop_step = stop_step; |
| 471 | tp->step_multi = step_multi; |
| 472 | tp->stop_signal = stop_signal; |
| 473 | tp->stop_bpstat = stop_bpstat; |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | /* Return true if TP is an active thread. */ |
| 478 | static int |
| 479 | thread_alive (struct thread_info *tp) |
| 480 | { |
| 481 | if (PIDGET (tp->ptid) == -1) |
| 482 | return 0; |
| 483 | if (!target_thread_alive (tp->ptid)) |
| 484 | { |
| 485 | tp->ptid = pid_to_ptid (-1); /* Mark it as dead */ |
| 486 | return 0; |
| 487 | } |
| 488 | return 1; |
| 489 | } |
| 490 | |
| 491 | static void |
| 492 | prune_threads (void) |
| 493 | { |
| 494 | struct thread_info *tp, *next; |
| 495 | |
| 496 | for (tp = thread_list; tp; tp = next) |
| 497 | { |
| 498 | next = tp->next; |
| 499 | if (!thread_alive (tp)) |
| 500 | delete_thread (tp->ptid); |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | void |
| 505 | set_running (ptid_t ptid, int running) |
| 506 | { |
| 507 | struct thread_info *tp; |
| 508 | |
| 509 | if (!thread_list) |
| 510 | { |
| 511 | /* This is one of the targets that does not add main |
| 512 | thread to the thread list. Just use a single |
| 513 | global flag to indicate that a thread is running. |
| 514 | |
| 515 | This problem is unique to ST programs. For MT programs, |
| 516 | the main thread is always present in the thread list. If it's |
| 517 | not, the first call to context_switch will mess up GDB internal |
| 518 | state. */ |
| 519 | if (running && !main_thread_running && !suppress_resume_observer) |
| 520 | observer_notify_target_resumed (ptid); |
| 521 | main_thread_running = running; |
| 522 | return; |
| 523 | } |
| 524 | |
| 525 | /* We try not to notify the observer if no thread has actually changed |
| 526 | the running state -- merely to reduce the number of messages to |
| 527 | frontend. Frontend is supposed to handle multiple *running just fine. */ |
| 528 | if (PIDGET (ptid) == -1) |
| 529 | { |
| 530 | int any_started = 0; |
| 531 | for (tp = thread_list; tp; tp = tp->next) |
| 532 | { |
| 533 | if (running && !tp->running_) |
| 534 | any_started = 1; |
| 535 | tp->running_ = running; |
| 536 | } |
| 537 | if (any_started && !suppress_resume_observer) |
| 538 | observer_notify_target_resumed (ptid); |
| 539 | } |
| 540 | else |
| 541 | { |
| 542 | tp = find_thread_pid (ptid); |
| 543 | gdb_assert (tp); |
| 544 | if (running && !tp->running_ && !suppress_resume_observer) |
| 545 | observer_notify_target_resumed (ptid); |
| 546 | tp->running_ = running; |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | int |
| 551 | is_running (ptid_t ptid) |
| 552 | { |
| 553 | struct thread_info *tp; |
| 554 | |
| 555 | if (!target_has_execution) |
| 556 | return 0; |
| 557 | |
| 558 | if (!thread_list) |
| 559 | return main_thread_running; |
| 560 | |
| 561 | tp = find_thread_pid (ptid); |
| 562 | gdb_assert (tp); |
| 563 | return tp->running_; |
| 564 | } |
| 565 | |
| 566 | int |
| 567 | any_running (void) |
| 568 | { |
| 569 | struct thread_info *tp; |
| 570 | |
| 571 | if (!target_has_execution) |
| 572 | return 0; |
| 573 | |
| 574 | if (!thread_list) |
| 575 | return main_thread_running; |
| 576 | |
| 577 | for (tp = thread_list; tp; tp = tp->next) |
| 578 | if (tp->running_) |
| 579 | return 1; |
| 580 | |
| 581 | return 0; |
| 582 | } |
| 583 | |
| 584 | int |
| 585 | is_executing (ptid_t ptid) |
| 586 | { |
| 587 | struct thread_info *tp; |
| 588 | |
| 589 | if (!target_has_execution) |
| 590 | return 0; |
| 591 | |
| 592 | if (!thread_list) |
| 593 | return main_thread_executing; |
| 594 | |
| 595 | tp = find_thread_pid (ptid); |
| 596 | gdb_assert (tp); |
| 597 | return tp->executing_; |
| 598 | } |
| 599 | |
| 600 | void |
| 601 | set_executing (ptid_t ptid, int executing) |
| 602 | { |
| 603 | struct thread_info *tp; |
| 604 | |
| 605 | if (!thread_list) |
| 606 | { |
| 607 | /* This target does not add the main thread to the thread list. |
| 608 | Use a global flag to indicate that the thread is |
| 609 | executing. */ |
| 610 | main_thread_executing = executing; |
| 611 | return; |
| 612 | } |
| 613 | |
| 614 | if (PIDGET (ptid) == -1) |
| 615 | { |
| 616 | for (tp = thread_list; tp; tp = tp->next) |
| 617 | tp->executing_ = executing; |
| 618 | } |
| 619 | else |
| 620 | { |
| 621 | tp = find_thread_pid (ptid); |
| 622 | gdb_assert (tp); |
| 623 | tp->executing_ = executing; |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | /* Prints the list of threads and their details on UIOUT. |
| 628 | This is a version of 'info_thread_command' suitable for |
| 629 | use from MI. |
| 630 | If REQESTED_THREAD is not -1, it's the GDB id of the thread |
| 631 | that should be printed. Otherwise, all threads are |
| 632 | printed. */ |
| 633 | void |
| 634 | print_thread_info (struct ui_out *uiout, int requested_thread) |
| 635 | { |
| 636 | struct thread_info *tp; |
| 637 | ptid_t current_ptid; |
| 638 | struct frame_info *cur_frame; |
| 639 | struct cleanup *old_chain; |
| 640 | struct frame_id saved_frame_id; |
| 641 | char *extra_info; |
| 642 | int current_thread = -1; |
| 643 | |
| 644 | /* Backup current thread and selected frame. */ |
| 645 | if (!is_running (inferior_ptid)) |
| 646 | saved_frame_id = get_frame_id (get_selected_frame (NULL)); |
| 647 | else |
| 648 | saved_frame_id = null_frame_id; |
| 649 | |
| 650 | old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id); |
| 651 | make_cleanup_ui_out_list_begin_end (uiout, "threads"); |
| 652 | |
| 653 | prune_threads (); |
| 654 | target_find_new_threads (); |
| 655 | current_ptid = inferior_ptid; |
| 656 | for (tp = thread_list; tp; tp = tp->next) |
| 657 | { |
| 658 | struct cleanup *chain2; |
| 659 | |
| 660 | if (requested_thread != -1 && tp->num != requested_thread) |
| 661 | continue; |
| 662 | |
| 663 | chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); |
| 664 | |
| 665 | if (ptid_equal (tp->ptid, current_ptid)) |
| 666 | { |
| 667 | current_thread = tp->num; |
| 668 | ui_out_text (uiout, "* "); |
| 669 | } |
| 670 | else |
| 671 | ui_out_text (uiout, " "); |
| 672 | |
| 673 | ui_out_field_int (uiout, "id", tp->num); |
| 674 | ui_out_text (uiout, " "); |
| 675 | ui_out_field_string (uiout, "target-id", target_tid_to_str (tp->ptid)); |
| 676 | |
| 677 | extra_info = target_extra_thread_info (tp); |
| 678 | if (extra_info) |
| 679 | { |
| 680 | ui_out_text (uiout, " ("); |
| 681 | ui_out_field_string (uiout, "details", extra_info); |
| 682 | ui_out_text (uiout, ")"); |
| 683 | } |
| 684 | ui_out_text (uiout, " "); |
| 685 | if (tp->running_) |
| 686 | ui_out_text (uiout, "(running)\n"); |
| 687 | else |
| 688 | { |
| 689 | /* The switch below puts us at the top of the stack (leaf |
| 690 | frame). */ |
| 691 | switch_to_thread (tp->ptid); |
| 692 | print_stack_frame (get_selected_frame (NULL), |
| 693 | /* For MI output, print frame level. */ |
| 694 | ui_out_is_mi_like_p (uiout), |
| 695 | LOCATION); |
| 696 | } |
| 697 | |
| 698 | do_cleanups (chain2); |
| 699 | } |
| 700 | |
| 701 | /* Restores the current thread and the frame selected before |
| 702 | the "info threads" command. */ |
| 703 | do_cleanups (old_chain); |
| 704 | |
| 705 | if (requested_thread == -1) |
| 706 | { |
| 707 | gdb_assert (current_thread != -1 || !thread_list); |
| 708 | if (current_thread != -1 && ui_out_is_mi_like_p (uiout)) |
| 709 | ui_out_field_int (uiout, "current-thread-id", current_thread); |
| 710 | } |
| 711 | |
| 712 | if (is_running (inferior_ptid)) |
| 713 | return; |
| 714 | |
| 715 | /* If case we were not able to find the original frame, print the |
| 716 | new selected frame. */ |
| 717 | if (frame_find_by_id (saved_frame_id) == NULL) |
| 718 | { |
| 719 | warning (_("Couldn't restore frame in current thread, at frame 0")); |
| 720 | /* For MI, we should probably have a notification about |
| 721 | current frame change. But this error is not very likely, so |
| 722 | don't bother for now. */ |
| 723 | if (!ui_out_is_mi_like_p (uiout)) |
| 724 | print_stack_frame (get_selected_frame (NULL), 0, LOCATION); |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | |
| 729 | /* Print information about currently known threads |
| 730 | |
| 731 | * Note: this has the drawback that it _really_ switches |
| 732 | * threads, which frees the frame cache. A no-side |
| 733 | * effects info-threads command would be nicer. |
| 734 | */ |
| 735 | |
| 736 | static void |
| 737 | info_threads_command (char *arg, int from_tty) |
| 738 | { |
| 739 | print_thread_info (uiout, -1); |
| 740 | } |
| 741 | |
| 742 | /* Switch from one thread to another. */ |
| 743 | |
| 744 | void |
| 745 | switch_to_thread (ptid_t ptid) |
| 746 | { |
| 747 | if (ptid_equal (ptid, inferior_ptid)) |
| 748 | return; |
| 749 | |
| 750 | inferior_ptid = ptid; |
| 751 | reinit_frame_cache (); |
| 752 | registers_changed (); |
| 753 | |
| 754 | if (!is_executing (ptid)) |
| 755 | stop_pc = read_pc (); |
| 756 | else |
| 757 | stop_pc = ~(CORE_ADDR) 0; |
| 758 | } |
| 759 | |
| 760 | static void |
| 761 | restore_current_thread (ptid_t ptid) |
| 762 | { |
| 763 | if (!ptid_equal (ptid, inferior_ptid)) |
| 764 | { |
| 765 | switch_to_thread (ptid); |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | static void |
| 770 | restore_selected_frame (struct frame_id a_frame_id) |
| 771 | { |
| 772 | struct frame_info *selected_frame_info = NULL; |
| 773 | |
| 774 | if (frame_id_eq (a_frame_id, null_frame_id)) |
| 775 | return; |
| 776 | |
| 777 | if ((selected_frame_info = frame_find_by_id (a_frame_id)) != NULL) |
| 778 | { |
| 779 | select_frame (selected_frame_info); |
| 780 | } |
| 781 | } |
| 782 | |
| 783 | struct current_thread_cleanup |
| 784 | { |
| 785 | ptid_t inferior_ptid; |
| 786 | struct frame_id selected_frame_id; |
| 787 | }; |
| 788 | |
| 789 | static void |
| 790 | do_restore_current_thread_cleanup (void *arg) |
| 791 | { |
| 792 | struct current_thread_cleanup *old = arg; |
| 793 | restore_current_thread (old->inferior_ptid); |
| 794 | |
| 795 | /* A command like 'thread apply all $exec_command&' may change the |
| 796 | running state of the originally selected thread, so we have to |
| 797 | recheck it here. */ |
| 798 | if (!is_running (old->inferior_ptid)) |
| 799 | restore_selected_frame (old->selected_frame_id); |
| 800 | xfree (old); |
| 801 | } |
| 802 | |
| 803 | struct cleanup * |
| 804 | make_cleanup_restore_current_thread (ptid_t inferior_ptid, |
| 805 | struct frame_id a_frame_id) |
| 806 | { |
| 807 | struct current_thread_cleanup *old |
| 808 | = xmalloc (sizeof (struct current_thread_cleanup)); |
| 809 | old->inferior_ptid = inferior_ptid; |
| 810 | old->selected_frame_id = a_frame_id; |
| 811 | return make_cleanup (do_restore_current_thread_cleanup, old); |
| 812 | } |
| 813 | |
| 814 | /* Apply a GDB command to a list of threads. List syntax is a whitespace |
| 815 | seperated list of numbers, or ranges, or the keyword `all'. Ranges consist |
| 816 | of two numbers seperated by a hyphen. Examples: |
| 817 | |
| 818 | thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4 |
| 819 | thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9 |
| 820 | thread apply all p x/i $pc Apply x/i $pc cmd to all threads |
| 821 | */ |
| 822 | |
| 823 | static void |
| 824 | thread_apply_all_command (char *cmd, int from_tty) |
| 825 | { |
| 826 | struct thread_info *tp; |
| 827 | struct cleanup *old_chain = make_cleanup (null_cleanup, 0); |
| 828 | char *saved_cmd; |
| 829 | struct frame_id saved_frame_id; |
| 830 | ptid_t current_ptid; |
| 831 | int thread_has_changed = 0; |
| 832 | |
| 833 | if (cmd == NULL || *cmd == '\000') |
| 834 | error (_("Please specify a command following the thread ID list")); |
| 835 | |
| 836 | current_ptid = inferior_ptid; |
| 837 | |
| 838 | if (!is_running (inferior_ptid)) |
| 839 | saved_frame_id = get_frame_id (get_selected_frame (NULL)); |
| 840 | else |
| 841 | saved_frame_id = null_frame_id; |
| 842 | make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id); |
| 843 | |
| 844 | /* It is safe to update the thread list now, before |
| 845 | traversing it for "thread apply all". MVS */ |
| 846 | target_find_new_threads (); |
| 847 | |
| 848 | /* Save a copy of the command in case it is clobbered by |
| 849 | execute_command */ |
| 850 | saved_cmd = xstrdup (cmd); |
| 851 | make_cleanup (xfree, saved_cmd); |
| 852 | for (tp = thread_list; tp; tp = tp->next) |
| 853 | if (thread_alive (tp)) |
| 854 | { |
| 855 | if (non_stop) |
| 856 | context_switch_to (tp->ptid); |
| 857 | else |
| 858 | switch_to_thread (tp->ptid); |
| 859 | |
| 860 | printf_filtered (_("\nThread %d (%s):\n"), |
| 861 | tp->num, target_tid_to_str (inferior_ptid)); |
| 862 | execute_command (cmd, from_tty); |
| 863 | strcpy (cmd, saved_cmd); /* Restore exact command used previously */ |
| 864 | } |
| 865 | |
| 866 | if (!ptid_equal (current_ptid, inferior_ptid)) |
| 867 | thread_has_changed = 1; |
| 868 | |
| 869 | do_cleanups (old_chain); |
| 870 | /* Print stack frame only if we changed thread. */ |
| 871 | if (thread_has_changed && !is_running (inferior_ptid)) |
| 872 | print_stack_frame (get_current_frame (), 1, SRC_LINE); |
| 873 | } |
| 874 | |
| 875 | static void |
| 876 | thread_apply_command (char *tidlist, int from_tty) |
| 877 | { |
| 878 | char *cmd; |
| 879 | char *p; |
| 880 | struct cleanup *old_chain; |
| 881 | struct cleanup *saved_cmd_cleanup_chain; |
| 882 | char *saved_cmd; |
| 883 | struct frame_id saved_frame_id; |
| 884 | ptid_t current_ptid; |
| 885 | int thread_has_changed = 0; |
| 886 | |
| 887 | if (tidlist == NULL || *tidlist == '\000') |
| 888 | error (_("Please specify a thread ID list")); |
| 889 | |
| 890 | for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++); |
| 891 | |
| 892 | if (*cmd == '\000') |
| 893 | error (_("Please specify a command following the thread ID list")); |
| 894 | |
| 895 | current_ptid = inferior_ptid; |
| 896 | |
| 897 | if (!is_running (inferior_ptid)) |
| 898 | saved_frame_id = get_frame_id (get_selected_frame (NULL)); |
| 899 | else |
| 900 | saved_frame_id = null_frame_id; |
| 901 | old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id); |
| 902 | |
| 903 | /* Save a copy of the command in case it is clobbered by |
| 904 | execute_command */ |
| 905 | saved_cmd = xstrdup (cmd); |
| 906 | saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd); |
| 907 | while (tidlist < cmd) |
| 908 | { |
| 909 | struct thread_info *tp; |
| 910 | int start, end; |
| 911 | |
| 912 | start = strtol (tidlist, &p, 10); |
| 913 | if (p == tidlist) |
| 914 | error (_("Error parsing %s"), tidlist); |
| 915 | tidlist = p; |
| 916 | |
| 917 | while (*tidlist == ' ' || *tidlist == '\t') |
| 918 | tidlist++; |
| 919 | |
| 920 | if (*tidlist == '-') /* Got a range of IDs? */ |
| 921 | { |
| 922 | tidlist++; /* Skip the - */ |
| 923 | end = strtol (tidlist, &p, 10); |
| 924 | if (p == tidlist) |
| 925 | error (_("Error parsing %s"), tidlist); |
| 926 | tidlist = p; |
| 927 | |
| 928 | while (*tidlist == ' ' || *tidlist == '\t') |
| 929 | tidlist++; |
| 930 | } |
| 931 | else |
| 932 | end = start; |
| 933 | |
| 934 | for (; start <= end; start++) |
| 935 | { |
| 936 | tp = find_thread_id (start); |
| 937 | |
| 938 | if (!tp) |
| 939 | warning (_("Unknown thread %d."), start); |
| 940 | else if (!thread_alive (tp)) |
| 941 | warning (_("Thread %d has terminated."), start); |
| 942 | else |
| 943 | { |
| 944 | if (non_stop) |
| 945 | context_switch_to (tp->ptid); |
| 946 | else |
| 947 | switch_to_thread (tp->ptid); |
| 948 | printf_filtered (_("\nThread %d (%s):\n"), tp->num, |
| 949 | target_tid_to_str (inferior_ptid)); |
| 950 | execute_command (cmd, from_tty); |
| 951 | strcpy (cmd, saved_cmd); /* Restore exact command used previously */ |
| 952 | } |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | if (!ptid_equal (current_ptid, inferior_ptid)) |
| 957 | thread_has_changed = 1; |
| 958 | |
| 959 | do_cleanups (saved_cmd_cleanup_chain); |
| 960 | do_cleanups (old_chain); |
| 961 | /* Print stack frame only if we changed thread. */ |
| 962 | if (thread_has_changed) |
| 963 | print_stack_frame (get_current_frame (), 1, SRC_LINE); |
| 964 | } |
| 965 | |
| 966 | /* Switch to the specified thread. Will dispatch off to thread_apply_command |
| 967 | if prefix of arg is `apply'. */ |
| 968 | |
| 969 | static void |
| 970 | thread_command (char *tidstr, int from_tty) |
| 971 | { |
| 972 | if (!tidstr) |
| 973 | { |
| 974 | /* Don't generate an error, just say which thread is current. */ |
| 975 | if (target_has_stack) |
| 976 | printf_filtered (_("[Current thread is %d (%s)]\n"), |
| 977 | pid_to_thread_id (inferior_ptid), |
| 978 | target_tid_to_str (inferior_ptid)); |
| 979 | else |
| 980 | error (_("No stack.")); |
| 981 | return; |
| 982 | } |
| 983 | |
| 984 | annotate_thread_changed (); |
| 985 | gdb_thread_select (uiout, tidstr, NULL); |
| 986 | } |
| 987 | |
| 988 | /* Print notices when new threads are attached and detached. */ |
| 989 | int print_thread_events = 1; |
| 990 | static void |
| 991 | show_print_thread_events (struct ui_file *file, int from_tty, |
| 992 | struct cmd_list_element *c, const char *value) |
| 993 | { |
| 994 | fprintf_filtered (file, _("\ |
| 995 | Printing of thread events is %s.\n"), |
| 996 | value); |
| 997 | } |
| 998 | |
| 999 | static int |
| 1000 | do_captured_thread_select (struct ui_out *uiout, void *tidstr) |
| 1001 | { |
| 1002 | int num; |
| 1003 | struct thread_info *tp; |
| 1004 | |
| 1005 | num = value_as_long (parse_and_eval (tidstr)); |
| 1006 | |
| 1007 | tp = find_thread_id (num); |
| 1008 | |
| 1009 | if (!tp) |
| 1010 | error (_("Thread ID %d not known."), num); |
| 1011 | |
| 1012 | if (!thread_alive (tp)) |
| 1013 | error (_("Thread ID %d has terminated."), num); |
| 1014 | |
| 1015 | if (non_stop) |
| 1016 | context_switch_to (tp->ptid); |
| 1017 | else |
| 1018 | switch_to_thread (tp->ptid); |
| 1019 | |
| 1020 | ui_out_text (uiout, "[Switching to thread "); |
| 1021 | ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid)); |
| 1022 | ui_out_text (uiout, " ("); |
| 1023 | ui_out_text (uiout, target_tid_to_str (inferior_ptid)); |
| 1024 | ui_out_text (uiout, ")]"); |
| 1025 | |
| 1026 | if (!tp->running_) |
| 1027 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| 1028 | else |
| 1029 | ui_out_text (uiout, "(running)\n"); |
| 1030 | |
| 1031 | return GDB_RC_OK; |
| 1032 | } |
| 1033 | |
| 1034 | enum gdb_rc |
| 1035 | gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message) |
| 1036 | { |
| 1037 | if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr, |
| 1038 | error_message, RETURN_MASK_ALL) < 0) |
| 1039 | return GDB_RC_FAIL; |
| 1040 | return GDB_RC_OK; |
| 1041 | } |
| 1042 | |
| 1043 | /* Commands with a prefix of `thread'. */ |
| 1044 | struct cmd_list_element *thread_cmd_list = NULL; |
| 1045 | |
| 1046 | void |
| 1047 | _initialize_thread (void) |
| 1048 | { |
| 1049 | static struct cmd_list_element *thread_apply_list = NULL; |
| 1050 | struct cmd_list_element *c; |
| 1051 | |
| 1052 | c = add_info ("threads", info_threads_command, |
| 1053 | _("IDs of currently known threads.")); |
| 1054 | set_cmd_async_ok (c); |
| 1055 | |
| 1056 | c = add_prefix_cmd ("thread", class_run, thread_command, _("\ |
| 1057 | Use this command to switch between threads.\n\ |
| 1058 | The new thread ID must be currently known."), |
| 1059 | &thread_cmd_list, "thread ", 1, &cmdlist); |
| 1060 | set_cmd_async_ok (c); |
| 1061 | |
| 1062 | add_prefix_cmd ("apply", class_run, thread_apply_command, |
| 1063 | _("Apply a command to a list of threads."), |
| 1064 | &thread_apply_list, "thread apply ", 1, &thread_cmd_list); |
| 1065 | |
| 1066 | add_cmd ("all", class_run, thread_apply_all_command, |
| 1067 | _("Apply a command to all threads."), &thread_apply_list); |
| 1068 | |
| 1069 | if (!xdb_commands) |
| 1070 | add_com_alias ("t", "thread", class_run, 1); |
| 1071 | |
| 1072 | add_setshow_boolean_cmd ("thread-events", no_class, |
| 1073 | &print_thread_events, _("\ |
| 1074 | Set printing of thread events (such as thread start and exit)."), _("\ |
| 1075 | Show printing of thread events (such as thread start and exit)."), NULL, |
| 1076 | NULL, |
| 1077 | show_print_thread_events, |
| 1078 | &setprintlist, &showprintlist); |
| 1079 | } |