| 1 | /* Multi-process/thread control for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "symtab.h" |
| 24 | #include "frame.h" |
| 25 | #include "inferior.h" |
| 26 | #include "gdbsupport/environ.h" |
| 27 | #include "value.h" |
| 28 | #include "target.h" |
| 29 | #include "gdbthread.h" |
| 30 | #include "command.h" |
| 31 | #include "gdbcmd.h" |
| 32 | #include "regcache.h" |
| 33 | #include "btrace.h" |
| 34 | |
| 35 | #include <ctype.h> |
| 36 | #include <sys/types.h> |
| 37 | #include <signal.h> |
| 38 | #include "ui-out.h" |
| 39 | #include "observable.h" |
| 40 | #include "annotate.h" |
| 41 | #include "cli/cli-decode.h" |
| 42 | #include "cli/cli-option.h" |
| 43 | #include "gdb_regex.h" |
| 44 | #include "cli/cli-utils.h" |
| 45 | #include "thread-fsm.h" |
| 46 | #include "tid-parse.h" |
| 47 | #include <algorithm> |
| 48 | #include "gdbsupport/gdb_optional.h" |
| 49 | #include "inline-frame.h" |
| 50 | #include "stack.h" |
| 51 | |
| 52 | /* Definition of struct thread_info exported to gdbthread.h. */ |
| 53 | |
| 54 | /* Prototypes for local functions. */ |
| 55 | |
| 56 | static int highest_thread_num; |
| 57 | |
| 58 | /* RAII type used to increase / decrease the refcount of each thread |
| 59 | in a given list of threads. */ |
| 60 | |
| 61 | class scoped_inc_dec_ref |
| 62 | { |
| 63 | public: |
| 64 | explicit scoped_inc_dec_ref (const std::vector<thread_info *> &thrds) |
| 65 | : m_thrds (thrds) |
| 66 | { |
| 67 | for (thread_info *thr : m_thrds) |
| 68 | thr->incref (); |
| 69 | } |
| 70 | |
| 71 | ~scoped_inc_dec_ref () |
| 72 | { |
| 73 | for (thread_info *thr : m_thrds) |
| 74 | thr->decref (); |
| 75 | } |
| 76 | |
| 77 | private: |
| 78 | const std::vector<thread_info *> &m_thrds; |
| 79 | }; |
| 80 | |
| 81 | |
| 82 | struct thread_info* |
| 83 | inferior_thread (void) |
| 84 | { |
| 85 | struct thread_info *tp = find_thread_ptid (current_inferior (), inferior_ptid); |
| 86 | gdb_assert (tp); |
| 87 | return tp; |
| 88 | } |
| 89 | |
| 90 | /* Delete the breakpoint pointed at by BP_P, if there's one. */ |
| 91 | |
| 92 | static void |
| 93 | delete_thread_breakpoint (struct breakpoint **bp_p) |
| 94 | { |
| 95 | if (*bp_p != NULL) |
| 96 | { |
| 97 | delete_breakpoint (*bp_p); |
| 98 | *bp_p = NULL; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | void |
| 103 | delete_step_resume_breakpoint (struct thread_info *tp) |
| 104 | { |
| 105 | if (tp != NULL) |
| 106 | delete_thread_breakpoint (&tp->control.step_resume_breakpoint); |
| 107 | } |
| 108 | |
| 109 | void |
| 110 | delete_exception_resume_breakpoint (struct thread_info *tp) |
| 111 | { |
| 112 | if (tp != NULL) |
| 113 | delete_thread_breakpoint (&tp->control.exception_resume_breakpoint); |
| 114 | } |
| 115 | |
| 116 | /* See gdbthread.h. */ |
| 117 | |
| 118 | void |
| 119 | delete_single_step_breakpoints (struct thread_info *tp) |
| 120 | { |
| 121 | if (tp != NULL) |
| 122 | delete_thread_breakpoint (&tp->control.single_step_breakpoints); |
| 123 | } |
| 124 | |
| 125 | /* Delete the breakpoint pointed at by BP_P at the next stop, if |
| 126 | there's one. */ |
| 127 | |
| 128 | static void |
| 129 | delete_at_next_stop (struct breakpoint **bp) |
| 130 | { |
| 131 | if (*bp != NULL) |
| 132 | { |
| 133 | (*bp)->disposition = disp_del_at_next_stop; |
| 134 | *bp = NULL; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | /* See gdbthread.h. */ |
| 139 | |
| 140 | int |
| 141 | thread_has_single_step_breakpoints_set (struct thread_info *tp) |
| 142 | { |
| 143 | return tp->control.single_step_breakpoints != NULL; |
| 144 | } |
| 145 | |
| 146 | /* See gdbthread.h. */ |
| 147 | |
| 148 | int |
| 149 | thread_has_single_step_breakpoint_here (struct thread_info *tp, |
| 150 | const address_space *aspace, |
| 151 | CORE_ADDR addr) |
| 152 | { |
| 153 | struct breakpoint *ss_bps = tp->control.single_step_breakpoints; |
| 154 | |
| 155 | return (ss_bps != NULL |
| 156 | && breakpoint_has_location_inserted_here (ss_bps, aspace, addr)); |
| 157 | } |
| 158 | |
| 159 | /* See gdbthread.h. */ |
| 160 | |
| 161 | void |
| 162 | thread_cancel_execution_command (struct thread_info *thr) |
| 163 | { |
| 164 | if (thr->thread_fsm != NULL) |
| 165 | { |
| 166 | thr->thread_fsm->clean_up (thr); |
| 167 | delete thr->thread_fsm; |
| 168 | thr->thread_fsm = NULL; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | static void |
| 173 | clear_thread_inferior_resources (struct thread_info *tp) |
| 174 | { |
| 175 | /* NOTE: this will take care of any left-over step_resume breakpoints, |
| 176 | but not any user-specified thread-specific breakpoints. We can not |
| 177 | delete the breakpoint straight-off, because the inferior might not |
| 178 | be stopped at the moment. */ |
| 179 | delete_at_next_stop (&tp->control.step_resume_breakpoint); |
| 180 | delete_at_next_stop (&tp->control.exception_resume_breakpoint); |
| 181 | delete_at_next_stop (&tp->control.single_step_breakpoints); |
| 182 | |
| 183 | delete_longjmp_breakpoint_at_next_stop (tp->global_num); |
| 184 | |
| 185 | bpstat_clear (&tp->control.stop_bpstat); |
| 186 | |
| 187 | btrace_teardown (tp); |
| 188 | |
| 189 | thread_cancel_execution_command (tp); |
| 190 | |
| 191 | clear_inline_frame_state (tp); |
| 192 | } |
| 193 | |
| 194 | /* Set the TP's state as exited. */ |
| 195 | |
| 196 | static void |
| 197 | set_thread_exited (thread_info *tp, int silent) |
| 198 | { |
| 199 | /* Dead threads don't need to step-over. Remove from queue. */ |
| 200 | if (tp->step_over_next != NULL) |
| 201 | thread_step_over_chain_remove (tp); |
| 202 | |
| 203 | if (tp->state != THREAD_EXITED) |
| 204 | { |
| 205 | gdb::observers::thread_exit.notify (tp, silent); |
| 206 | |
| 207 | /* Tag it as exited. */ |
| 208 | tp->state = THREAD_EXITED; |
| 209 | |
| 210 | /* Clear breakpoints, etc. associated with this thread. */ |
| 211 | clear_thread_inferior_resources (tp); |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | void |
| 216 | init_thread_list (void) |
| 217 | { |
| 218 | highest_thread_num = 0; |
| 219 | |
| 220 | for (thread_info *tp : all_threads_safe ()) |
| 221 | { |
| 222 | inferior *inf = tp->inf; |
| 223 | |
| 224 | if (tp->deletable ()) |
| 225 | delete tp; |
| 226 | else |
| 227 | set_thread_exited (tp, 1); |
| 228 | |
| 229 | inf->thread_list = NULL; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | /* Allocate a new thread of inferior INF with target id PTID and add |
| 234 | it to the thread list. */ |
| 235 | |
| 236 | static struct thread_info * |
| 237 | new_thread (struct inferior *inf, ptid_t ptid) |
| 238 | { |
| 239 | thread_info *tp = new thread_info (inf, ptid); |
| 240 | |
| 241 | if (inf->thread_list == NULL) |
| 242 | inf->thread_list = tp; |
| 243 | else |
| 244 | { |
| 245 | struct thread_info *last; |
| 246 | |
| 247 | for (last = inf->thread_list; last->next != NULL; last = last->next) |
| 248 | ; |
| 249 | last->next = tp; |
| 250 | } |
| 251 | |
| 252 | return tp; |
| 253 | } |
| 254 | |
| 255 | struct thread_info * |
| 256 | add_thread_silent (process_stratum_target *targ, ptid_t ptid) |
| 257 | { |
| 258 | inferior *inf; |
| 259 | |
| 260 | thread_info *tp = find_thread_ptid (targ, ptid); |
| 261 | if (tp) |
| 262 | /* Found an old thread with the same id. It has to be dead, |
| 263 | otherwise we wouldn't be adding a new thread with the same id. |
| 264 | The OS is reusing this id --- delete it, and recreate a new |
| 265 | one. */ |
| 266 | { |
| 267 | /* In addition to deleting the thread, if this is the current |
| 268 | thread, then we need to take care that delete_thread doesn't |
| 269 | really delete the thread if it is inferior_ptid. Create a |
| 270 | new template thread in the list with an invalid ptid, switch |
| 271 | to it, delete the original thread, reset the new thread's |
| 272 | ptid, and switch to it. */ |
| 273 | |
| 274 | if (inferior_ptid == ptid) |
| 275 | { |
| 276 | thread_info *new_thr = new_thread (tp->inf, null_ptid); |
| 277 | |
| 278 | /* Make switch_to_thread not read from the thread. */ |
| 279 | new_thr->state = THREAD_EXITED; |
| 280 | switch_to_no_thread (); |
| 281 | |
| 282 | /* Now we can delete it. */ |
| 283 | delete_thread (tp); |
| 284 | |
| 285 | /* Now reset its ptid, and reswitch inferior_ptid to it. */ |
| 286 | new_thr->ptid = ptid; |
| 287 | new_thr->state = THREAD_STOPPED; |
| 288 | switch_to_thread (new_thr); |
| 289 | |
| 290 | gdb::observers::new_thread.notify (new_thr); |
| 291 | |
| 292 | /* All done. */ |
| 293 | return new_thr; |
| 294 | } |
| 295 | |
| 296 | inf = tp->inf; |
| 297 | |
| 298 | /* Just go ahead and delete it. */ |
| 299 | delete_thread (tp); |
| 300 | } |
| 301 | else |
| 302 | inf = find_inferior_ptid (targ, ptid); |
| 303 | |
| 304 | tp = new_thread (inf, ptid); |
| 305 | gdb::observers::new_thread.notify (tp); |
| 306 | |
| 307 | return tp; |
| 308 | } |
| 309 | |
| 310 | struct thread_info * |
| 311 | add_thread_with_info (process_stratum_target *targ, ptid_t ptid, |
| 312 | private_thread_info *priv) |
| 313 | { |
| 314 | thread_info *result = add_thread_silent (targ, ptid); |
| 315 | |
| 316 | result->priv.reset (priv); |
| 317 | |
| 318 | if (print_thread_events) |
| 319 | printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid).c_str ()); |
| 320 | |
| 321 | annotate_new_thread (); |
| 322 | return result; |
| 323 | } |
| 324 | |
| 325 | struct thread_info * |
| 326 | add_thread (process_stratum_target *targ, ptid_t ptid) |
| 327 | { |
| 328 | return add_thread_with_info (targ, ptid, NULL); |
| 329 | } |
| 330 | |
| 331 | private_thread_info::~private_thread_info () = default; |
| 332 | |
| 333 | thread_info::thread_info (struct inferior *inf_, ptid_t ptid_) |
| 334 | : ptid (ptid_), inf (inf_) |
| 335 | { |
| 336 | gdb_assert (inf_ != NULL); |
| 337 | |
| 338 | this->global_num = ++highest_thread_num; |
| 339 | this->per_inf_num = ++inf_->highest_thread_num; |
| 340 | |
| 341 | /* Nothing to follow yet. */ |
| 342 | memset (&this->pending_follow, 0, sizeof (this->pending_follow)); |
| 343 | this->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| 344 | this->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; |
| 345 | } |
| 346 | |
| 347 | thread_info::~thread_info () |
| 348 | { |
| 349 | xfree (this->name); |
| 350 | } |
| 351 | |
| 352 | /* Returns true if THR is the current thread. */ |
| 353 | |
| 354 | static bool |
| 355 | is_current_thread (const thread_info *thr) |
| 356 | { |
| 357 | return thr->inf == current_inferior () && thr->ptid == inferior_ptid; |
| 358 | } |
| 359 | |
| 360 | /* See gdbthread.h. */ |
| 361 | |
| 362 | bool |
| 363 | thread_info::deletable () const |
| 364 | { |
| 365 | /* If this is the current thread, or there's code out there that |
| 366 | relies on it existing (refcount > 0) we can't delete yet. */ |
| 367 | return refcount () == 0 && !is_current_thread (this); |
| 368 | } |
| 369 | |
| 370 | /* Add TP to the end of the step-over chain LIST_P. */ |
| 371 | |
| 372 | static void |
| 373 | step_over_chain_enqueue (struct thread_info **list_p, struct thread_info *tp) |
| 374 | { |
| 375 | gdb_assert (tp->step_over_next == NULL); |
| 376 | gdb_assert (tp->step_over_prev == NULL); |
| 377 | |
| 378 | if (*list_p == NULL) |
| 379 | { |
| 380 | *list_p = tp; |
| 381 | tp->step_over_prev = tp->step_over_next = tp; |
| 382 | } |
| 383 | else |
| 384 | { |
| 385 | struct thread_info *head = *list_p; |
| 386 | struct thread_info *tail = head->step_over_prev; |
| 387 | |
| 388 | tp->step_over_prev = tail; |
| 389 | tp->step_over_next = head; |
| 390 | head->step_over_prev = tp; |
| 391 | tail->step_over_next = tp; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* Remove TP from step-over chain LIST_P. */ |
| 396 | |
| 397 | static void |
| 398 | step_over_chain_remove (struct thread_info **list_p, struct thread_info *tp) |
| 399 | { |
| 400 | gdb_assert (tp->step_over_next != NULL); |
| 401 | gdb_assert (tp->step_over_prev != NULL); |
| 402 | |
| 403 | if (*list_p == tp) |
| 404 | { |
| 405 | if (tp == tp->step_over_next) |
| 406 | *list_p = NULL; |
| 407 | else |
| 408 | *list_p = tp->step_over_next; |
| 409 | } |
| 410 | |
| 411 | tp->step_over_prev->step_over_next = tp->step_over_next; |
| 412 | tp->step_over_next->step_over_prev = tp->step_over_prev; |
| 413 | tp->step_over_prev = tp->step_over_next = NULL; |
| 414 | } |
| 415 | |
| 416 | /* See gdbthread.h. */ |
| 417 | |
| 418 | struct thread_info * |
| 419 | thread_step_over_chain_next (struct thread_info *tp) |
| 420 | { |
| 421 | struct thread_info *next = tp->step_over_next; |
| 422 | |
| 423 | return (next == step_over_queue_head ? NULL : next); |
| 424 | } |
| 425 | |
| 426 | /* See gdbthread.h. */ |
| 427 | |
| 428 | int |
| 429 | thread_is_in_step_over_chain (struct thread_info *tp) |
| 430 | { |
| 431 | return (tp->step_over_next != NULL); |
| 432 | } |
| 433 | |
| 434 | /* See gdbthread.h. */ |
| 435 | |
| 436 | void |
| 437 | thread_step_over_chain_enqueue (struct thread_info *tp) |
| 438 | { |
| 439 | step_over_chain_enqueue (&step_over_queue_head, tp); |
| 440 | } |
| 441 | |
| 442 | /* See gdbthread.h. */ |
| 443 | |
| 444 | void |
| 445 | thread_step_over_chain_remove (struct thread_info *tp) |
| 446 | { |
| 447 | step_over_chain_remove (&step_over_queue_head, tp); |
| 448 | } |
| 449 | |
| 450 | /* Delete the thread referenced by THR. If SILENT, don't notify |
| 451 | the observer of this exit. |
| 452 | |
| 453 | THR must not be NULL or a failed assertion will be raised. */ |
| 454 | |
| 455 | static void |
| 456 | delete_thread_1 (thread_info *thr, bool silent) |
| 457 | { |
| 458 | gdb_assert (thr != nullptr); |
| 459 | |
| 460 | struct thread_info *tp, *tpprev = NULL; |
| 461 | |
| 462 | for (tp = thr->inf->thread_list; tp; tpprev = tp, tp = tp->next) |
| 463 | if (tp == thr) |
| 464 | break; |
| 465 | |
| 466 | if (!tp) |
| 467 | return; |
| 468 | |
| 469 | set_thread_exited (tp, silent); |
| 470 | |
| 471 | if (!tp->deletable ()) |
| 472 | { |
| 473 | /* Will be really deleted some other time. */ |
| 474 | return; |
| 475 | } |
| 476 | |
| 477 | if (tpprev) |
| 478 | tpprev->next = tp->next; |
| 479 | else |
| 480 | tp->inf->thread_list = tp->next; |
| 481 | |
| 482 | delete tp; |
| 483 | } |
| 484 | |
| 485 | /* Delete thread THREAD and notify of thread exit. If this is the |
| 486 | current thread, don't actually delete it, but tag it as exited and |
| 487 | do the notification. If this is the user selected thread, clear |
| 488 | it. */ |
| 489 | |
| 490 | void |
| 491 | delete_thread (thread_info *thread) |
| 492 | { |
| 493 | delete_thread_1 (thread, false /* not silent */); |
| 494 | } |
| 495 | |
| 496 | void |
| 497 | delete_thread_silent (thread_info *thread) |
| 498 | { |
| 499 | delete_thread_1 (thread, true /* silent */); |
| 500 | } |
| 501 | |
| 502 | struct thread_info * |
| 503 | find_thread_global_id (int global_id) |
| 504 | { |
| 505 | for (thread_info *tp : all_threads ()) |
| 506 | if (tp->global_num == global_id) |
| 507 | return tp; |
| 508 | |
| 509 | return NULL; |
| 510 | } |
| 511 | |
| 512 | static struct thread_info * |
| 513 | find_thread_id (struct inferior *inf, int thr_num) |
| 514 | { |
| 515 | for (thread_info *tp : inf->threads ()) |
| 516 | if (tp->per_inf_num == thr_num) |
| 517 | return tp; |
| 518 | |
| 519 | return NULL; |
| 520 | } |
| 521 | |
| 522 | /* See gdbthread.h. */ |
| 523 | |
| 524 | struct thread_info * |
| 525 | find_thread_ptid (process_stratum_target *targ, ptid_t ptid) |
| 526 | { |
| 527 | inferior *inf = find_inferior_ptid (targ, ptid); |
| 528 | if (inf == NULL) |
| 529 | return NULL; |
| 530 | return find_thread_ptid (inf, ptid); |
| 531 | } |
| 532 | |
| 533 | /* See gdbthread.h. */ |
| 534 | |
| 535 | struct thread_info * |
| 536 | find_thread_ptid (inferior *inf, ptid_t ptid) |
| 537 | { |
| 538 | for (thread_info *tp : inf->threads ()) |
| 539 | if (tp->ptid == ptid) |
| 540 | return tp; |
| 541 | |
| 542 | return NULL; |
| 543 | } |
| 544 | |
| 545 | /* See gdbthread.h. */ |
| 546 | |
| 547 | struct thread_info * |
| 548 | find_thread_by_handle (gdb::array_view<const gdb_byte> handle, |
| 549 | struct inferior *inf) |
| 550 | { |
| 551 | return target_thread_handle_to_thread_info (handle.data (), |
| 552 | handle.size (), |
| 553 | inf); |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * Thread iterator function. |
| 558 | * |
| 559 | * Calls a callback function once for each thread, so long as |
| 560 | * the callback function returns false. If the callback function |
| 561 | * returns true, the iteration will end and the current thread |
| 562 | * will be returned. This can be useful for implementing a |
| 563 | * search for a thread with arbitrary attributes, or for applying |
| 564 | * some operation to every thread. |
| 565 | * |
| 566 | * FIXME: some of the existing functionality, such as |
| 567 | * "Thread apply all", might be rewritten using this functionality. |
| 568 | */ |
| 569 | |
| 570 | struct thread_info * |
| 571 | iterate_over_threads (int (*callback) (struct thread_info *, void *), |
| 572 | void *data) |
| 573 | { |
| 574 | for (thread_info *tp : all_threads_safe ()) |
| 575 | if ((*callback) (tp, data)) |
| 576 | return tp; |
| 577 | |
| 578 | return NULL; |
| 579 | } |
| 580 | |
| 581 | /* See gdbthread.h. */ |
| 582 | |
| 583 | bool |
| 584 | any_thread_p () |
| 585 | { |
| 586 | for (thread_info *tp ATTRIBUTE_UNUSED : all_threads ()) |
| 587 | return true; |
| 588 | return false; |
| 589 | } |
| 590 | |
| 591 | int |
| 592 | thread_count (process_stratum_target *proc_target) |
| 593 | { |
| 594 | auto rng = all_threads (proc_target); |
| 595 | return std::distance (rng.begin (), rng.end ()); |
| 596 | } |
| 597 | |
| 598 | /* Return the number of non-exited threads in the thread list. */ |
| 599 | |
| 600 | static int |
| 601 | live_threads_count (void) |
| 602 | { |
| 603 | auto rng = all_non_exited_threads (); |
| 604 | return std::distance (rng.begin (), rng.end ()); |
| 605 | } |
| 606 | |
| 607 | int |
| 608 | valid_global_thread_id (int global_id) |
| 609 | { |
| 610 | for (thread_info *tp : all_threads ()) |
| 611 | if (tp->global_num == global_id) |
| 612 | return 1; |
| 613 | |
| 614 | return 0; |
| 615 | } |
| 616 | |
| 617 | bool |
| 618 | in_thread_list (process_stratum_target *targ, ptid_t ptid) |
| 619 | { |
| 620 | return find_thread_ptid (targ, ptid) != nullptr; |
| 621 | } |
| 622 | |
| 623 | /* Finds the first thread of the inferior. */ |
| 624 | |
| 625 | thread_info * |
| 626 | first_thread_of_inferior (inferior *inf) |
| 627 | { |
| 628 | return inf->thread_list; |
| 629 | } |
| 630 | |
| 631 | thread_info * |
| 632 | any_thread_of_inferior (inferior *inf) |
| 633 | { |
| 634 | gdb_assert (inf->pid != 0); |
| 635 | |
| 636 | /* Prefer the current thread. */ |
| 637 | if (inf == current_inferior ()) |
| 638 | return inferior_thread (); |
| 639 | |
| 640 | for (thread_info *tp : inf->non_exited_threads ()) |
| 641 | return tp; |
| 642 | |
| 643 | return NULL; |
| 644 | } |
| 645 | |
| 646 | thread_info * |
| 647 | any_live_thread_of_inferior (inferior *inf) |
| 648 | { |
| 649 | struct thread_info *curr_tp = NULL; |
| 650 | struct thread_info *tp_executing = NULL; |
| 651 | |
| 652 | gdb_assert (inf != NULL && inf->pid != 0); |
| 653 | |
| 654 | /* Prefer the current thread if it's not executing. */ |
| 655 | if (inferior_ptid != null_ptid && current_inferior () == inf) |
| 656 | { |
| 657 | /* If the current thread is dead, forget it. If it's not |
| 658 | executing, use it. Otherwise, still choose it (below), but |
| 659 | only if no other non-executing thread is found. */ |
| 660 | curr_tp = inferior_thread (); |
| 661 | if (curr_tp->state == THREAD_EXITED) |
| 662 | curr_tp = NULL; |
| 663 | else if (!curr_tp->executing) |
| 664 | return curr_tp; |
| 665 | } |
| 666 | |
| 667 | for (thread_info *tp : inf->non_exited_threads ()) |
| 668 | { |
| 669 | if (!tp->executing) |
| 670 | return tp; |
| 671 | |
| 672 | tp_executing = tp; |
| 673 | } |
| 674 | |
| 675 | /* If both the current thread and all live threads are executing, |
| 676 | prefer the current thread. */ |
| 677 | if (curr_tp != NULL) |
| 678 | return curr_tp; |
| 679 | |
| 680 | /* Otherwise, just return an executing thread, if any. */ |
| 681 | return tp_executing; |
| 682 | } |
| 683 | |
| 684 | /* Return true if TP is an active thread. */ |
| 685 | static bool |
| 686 | thread_alive (thread_info *tp) |
| 687 | { |
| 688 | if (tp->state == THREAD_EXITED) |
| 689 | return false; |
| 690 | |
| 691 | /* Ensure we're looking at the right target stack. */ |
| 692 | gdb_assert (tp->inf == current_inferior ()); |
| 693 | |
| 694 | return target_thread_alive (tp->ptid); |
| 695 | } |
| 696 | |
| 697 | /* Switch to thread TP if it is alive. Returns true if successfully |
| 698 | switched, false otherwise. */ |
| 699 | |
| 700 | static bool |
| 701 | switch_to_thread_if_alive (thread_info *thr) |
| 702 | { |
| 703 | scoped_restore_current_thread restore_thread; |
| 704 | |
| 705 | /* Switch inferior first, so that we're looking at the right target |
| 706 | stack. */ |
| 707 | switch_to_inferior_no_thread (thr->inf); |
| 708 | |
| 709 | if (thread_alive (thr)) |
| 710 | { |
| 711 | switch_to_thread (thr); |
| 712 | restore_thread.dont_restore (); |
| 713 | return true; |
| 714 | } |
| 715 | |
| 716 | return false; |
| 717 | } |
| 718 | |
| 719 | /* See gdbthreads.h. */ |
| 720 | |
| 721 | void |
| 722 | prune_threads (void) |
| 723 | { |
| 724 | scoped_restore_current_thread restore_thread; |
| 725 | |
| 726 | for (thread_info *tp : all_threads_safe ()) |
| 727 | { |
| 728 | switch_to_inferior_no_thread (tp->inf); |
| 729 | |
| 730 | if (!thread_alive (tp)) |
| 731 | delete_thread (tp); |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | /* See gdbthreads.h. */ |
| 736 | |
| 737 | void |
| 738 | delete_exited_threads (void) |
| 739 | { |
| 740 | for (thread_info *tp : all_threads_safe ()) |
| 741 | if (tp->state == THREAD_EXITED) |
| 742 | delete_thread (tp); |
| 743 | } |
| 744 | |
| 745 | /* Return true value if stack temporaries are enabled for the thread |
| 746 | TP. */ |
| 747 | |
| 748 | bool |
| 749 | thread_stack_temporaries_enabled_p (thread_info *tp) |
| 750 | { |
| 751 | if (tp == NULL) |
| 752 | return false; |
| 753 | else |
| 754 | return tp->stack_temporaries_enabled; |
| 755 | } |
| 756 | |
| 757 | /* Push V on to the stack temporaries of the thread with id PTID. */ |
| 758 | |
| 759 | void |
| 760 | push_thread_stack_temporary (thread_info *tp, struct value *v) |
| 761 | { |
| 762 | gdb_assert (tp != NULL && tp->stack_temporaries_enabled); |
| 763 | tp->stack_temporaries.push_back (v); |
| 764 | } |
| 765 | |
| 766 | /* Return true if VAL is among the stack temporaries of the thread |
| 767 | TP. Return false otherwise. */ |
| 768 | |
| 769 | bool |
| 770 | value_in_thread_stack_temporaries (struct value *val, thread_info *tp) |
| 771 | { |
| 772 | gdb_assert (tp != NULL && tp->stack_temporaries_enabled); |
| 773 | for (value *v : tp->stack_temporaries) |
| 774 | if (v == val) |
| 775 | return true; |
| 776 | |
| 777 | return false; |
| 778 | } |
| 779 | |
| 780 | /* Return the last of the stack temporaries for thread with id PTID. |
| 781 | Return NULL if there are no stack temporaries for the thread. */ |
| 782 | |
| 783 | value * |
| 784 | get_last_thread_stack_temporary (thread_info *tp) |
| 785 | { |
| 786 | struct value *lastval = NULL; |
| 787 | |
| 788 | gdb_assert (tp != NULL); |
| 789 | if (!tp->stack_temporaries.empty ()) |
| 790 | lastval = tp->stack_temporaries.back (); |
| 791 | |
| 792 | return lastval; |
| 793 | } |
| 794 | |
| 795 | void |
| 796 | thread_change_ptid (process_stratum_target *targ, |
| 797 | ptid_t old_ptid, ptid_t new_ptid) |
| 798 | { |
| 799 | struct inferior *inf; |
| 800 | struct thread_info *tp; |
| 801 | |
| 802 | /* It can happen that what we knew as the target inferior id |
| 803 | changes. E.g, target remote may only discover the remote process |
| 804 | pid after adding the inferior to GDB's list. */ |
| 805 | inf = find_inferior_ptid (targ, old_ptid); |
| 806 | inf->pid = new_ptid.pid (); |
| 807 | |
| 808 | tp = find_thread_ptid (inf, old_ptid); |
| 809 | tp->ptid = new_ptid; |
| 810 | |
| 811 | gdb::observers::thread_ptid_changed.notify (old_ptid, new_ptid); |
| 812 | } |
| 813 | |
| 814 | /* See gdbthread.h. */ |
| 815 | |
| 816 | void |
| 817 | set_resumed (process_stratum_target *targ, ptid_t ptid, bool resumed) |
| 818 | { |
| 819 | for (thread_info *tp : all_non_exited_threads (targ, ptid)) |
| 820 | tp->resumed = resumed; |
| 821 | } |
| 822 | |
| 823 | /* Helper for set_running, that marks one thread either running or |
| 824 | stopped. */ |
| 825 | |
| 826 | static bool |
| 827 | set_running_thread (struct thread_info *tp, bool running) |
| 828 | { |
| 829 | bool started = false; |
| 830 | |
| 831 | if (running && tp->state == THREAD_STOPPED) |
| 832 | started = true; |
| 833 | tp->state = running ? THREAD_RUNNING : THREAD_STOPPED; |
| 834 | |
| 835 | if (!running) |
| 836 | { |
| 837 | /* If the thread is now marked stopped, remove it from |
| 838 | the step-over queue, so that we don't try to resume |
| 839 | it until the user wants it to. */ |
| 840 | if (tp->step_over_next != NULL) |
| 841 | thread_step_over_chain_remove (tp); |
| 842 | } |
| 843 | |
| 844 | return started; |
| 845 | } |
| 846 | |
| 847 | /* See gdbthread.h. */ |
| 848 | |
| 849 | void |
| 850 | thread_info::set_running (bool running) |
| 851 | { |
| 852 | if (set_running_thread (this, running)) |
| 853 | gdb::observers::target_resumed.notify (this->ptid); |
| 854 | } |
| 855 | |
| 856 | void |
| 857 | set_running (process_stratum_target *targ, ptid_t ptid, bool running) |
| 858 | { |
| 859 | /* We try not to notify the observer if no thread has actually |
| 860 | changed the running state -- merely to reduce the number of |
| 861 | messages to the MI frontend. A frontend is supposed to handle |
| 862 | multiple *running notifications just fine. */ |
| 863 | bool any_started = false; |
| 864 | |
| 865 | for (thread_info *tp : all_non_exited_threads (targ, ptid)) |
| 866 | if (set_running_thread (tp, running)) |
| 867 | any_started = true; |
| 868 | |
| 869 | if (any_started) |
| 870 | gdb::observers::target_resumed.notify (ptid); |
| 871 | } |
| 872 | |
| 873 | |
| 874 | /* Helper for set_executing. Set's the thread's 'executing' field |
| 875 | from EXECUTING, and if EXECUTING is true also clears the thread's |
| 876 | stop_pc. */ |
| 877 | |
| 878 | static void |
| 879 | set_executing_thread (thread_info *thr, bool executing) |
| 880 | { |
| 881 | thr->executing = executing; |
| 882 | if (executing) |
| 883 | thr->suspend.stop_pc = ~(CORE_ADDR) 0; |
| 884 | } |
| 885 | |
| 886 | void |
| 887 | set_executing (process_stratum_target *targ, ptid_t ptid, bool executing) |
| 888 | { |
| 889 | for (thread_info *tp : all_non_exited_threads (targ, ptid)) |
| 890 | set_executing_thread (tp, executing); |
| 891 | |
| 892 | /* It only takes one running thread to spawn more threads. */ |
| 893 | if (executing) |
| 894 | targ->threads_executing = true; |
| 895 | /* Only clear the flag if the caller is telling us everything is |
| 896 | stopped. */ |
| 897 | else if (minus_one_ptid == ptid) |
| 898 | targ->threads_executing = false; |
| 899 | } |
| 900 | |
| 901 | /* See gdbthread.h. */ |
| 902 | |
| 903 | bool |
| 904 | threads_are_executing (process_stratum_target *target) |
| 905 | { |
| 906 | return target->threads_executing; |
| 907 | } |
| 908 | |
| 909 | void |
| 910 | set_stop_requested (process_stratum_target *targ, ptid_t ptid, bool stop) |
| 911 | { |
| 912 | for (thread_info *tp : all_non_exited_threads (targ, ptid)) |
| 913 | tp->stop_requested = stop; |
| 914 | |
| 915 | /* Call the stop requested observer so other components of GDB can |
| 916 | react to this request. */ |
| 917 | if (stop) |
| 918 | gdb::observers::thread_stop_requested.notify (ptid); |
| 919 | } |
| 920 | |
| 921 | void |
| 922 | finish_thread_state (process_stratum_target *targ, ptid_t ptid) |
| 923 | { |
| 924 | bool any_started = false; |
| 925 | |
| 926 | for (thread_info *tp : all_non_exited_threads (targ, ptid)) |
| 927 | if (set_running_thread (tp, tp->executing)) |
| 928 | any_started = true; |
| 929 | |
| 930 | if (any_started) |
| 931 | gdb::observers::target_resumed.notify (ptid); |
| 932 | } |
| 933 | |
| 934 | /* See gdbthread.h. */ |
| 935 | |
| 936 | void |
| 937 | validate_registers_access (void) |
| 938 | { |
| 939 | /* No selected thread, no registers. */ |
| 940 | if (inferior_ptid == null_ptid) |
| 941 | error (_("No thread selected.")); |
| 942 | |
| 943 | thread_info *tp = inferior_thread (); |
| 944 | |
| 945 | /* Don't try to read from a dead thread. */ |
| 946 | if (tp->state == THREAD_EXITED) |
| 947 | error (_("The current thread has terminated")); |
| 948 | |
| 949 | /* ... or from a spinning thread. FIXME: This isn't actually fully |
| 950 | correct. It'll allow an user-requested access (e.g., "print $pc" |
| 951 | at the prompt) when a thread is not executing for some internal |
| 952 | reason, but is marked running from the user's perspective. E.g., |
| 953 | the thread is waiting for its turn in the step-over queue. */ |
| 954 | if (tp->executing) |
| 955 | error (_("Selected thread is running.")); |
| 956 | } |
| 957 | |
| 958 | /* See gdbthread.h. */ |
| 959 | |
| 960 | bool |
| 961 | can_access_registers_thread (thread_info *thread) |
| 962 | { |
| 963 | /* No thread, no registers. */ |
| 964 | if (thread == NULL) |
| 965 | return false; |
| 966 | |
| 967 | /* Don't try to read from a dead thread. */ |
| 968 | if (thread->state == THREAD_EXITED) |
| 969 | return false; |
| 970 | |
| 971 | /* ... or from a spinning thread. FIXME: see validate_registers_access. */ |
| 972 | if (thread->executing) |
| 973 | return false; |
| 974 | |
| 975 | return true; |
| 976 | } |
| 977 | |
| 978 | int |
| 979 | pc_in_thread_step_range (CORE_ADDR pc, struct thread_info *thread) |
| 980 | { |
| 981 | return (pc >= thread->control.step_range_start |
| 982 | && pc < thread->control.step_range_end); |
| 983 | } |
| 984 | |
| 985 | /* Helper for print_thread_info. Returns true if THR should be |
| 986 | printed. If REQUESTED_THREADS, a list of GDB ids/ranges, is not |
| 987 | NULL, only print THR if its ID is included in the list. GLOBAL_IDS |
| 988 | is true if REQUESTED_THREADS is list of global IDs, false if a list |
| 989 | of per-inferior thread ids. If PID is not -1, only print THR if it |
| 990 | is a thread from the process PID. Otherwise, threads from all |
| 991 | attached PIDs are printed. If both REQUESTED_THREADS is not NULL |
| 992 | and PID is not -1, then the thread is printed if it belongs to the |
| 993 | specified process. Otherwise, an error is raised. */ |
| 994 | |
| 995 | static int |
| 996 | should_print_thread (const char *requested_threads, int default_inf_num, |
| 997 | int global_ids, int pid, struct thread_info *thr) |
| 998 | { |
| 999 | if (requested_threads != NULL && *requested_threads != '\0') |
| 1000 | { |
| 1001 | int in_list; |
| 1002 | |
| 1003 | if (global_ids) |
| 1004 | in_list = number_is_in_list (requested_threads, thr->global_num); |
| 1005 | else |
| 1006 | in_list = tid_is_in_list (requested_threads, default_inf_num, |
| 1007 | thr->inf->num, thr->per_inf_num); |
| 1008 | if (!in_list) |
| 1009 | return 0; |
| 1010 | } |
| 1011 | |
| 1012 | if (pid != -1 && thr->ptid.pid () != pid) |
| 1013 | { |
| 1014 | if (requested_threads != NULL && *requested_threads != '\0') |
| 1015 | error (_("Requested thread not found in requested process")); |
| 1016 | return 0; |
| 1017 | } |
| 1018 | |
| 1019 | if (thr->state == THREAD_EXITED) |
| 1020 | return 0; |
| 1021 | |
| 1022 | return 1; |
| 1023 | } |
| 1024 | |
| 1025 | /* Return the string to display in "info threads"'s "Target Id" |
| 1026 | column, for TP. */ |
| 1027 | |
| 1028 | static std::string |
| 1029 | thread_target_id_str (thread_info *tp) |
| 1030 | { |
| 1031 | std::string target_id = target_pid_to_str (tp->ptid); |
| 1032 | const char *extra_info = target_extra_thread_info (tp); |
| 1033 | const char *name = tp->name != nullptr ? tp->name : target_thread_name (tp); |
| 1034 | |
| 1035 | if (extra_info != nullptr && name != nullptr) |
| 1036 | return string_printf ("%s \"%s\" (%s)", target_id.c_str (), name, |
| 1037 | extra_info); |
| 1038 | else if (extra_info != nullptr) |
| 1039 | return string_printf ("%s (%s)", target_id.c_str (), extra_info); |
| 1040 | else if (name != nullptr) |
| 1041 | return string_printf ("%s \"%s\"", target_id.c_str (), name); |
| 1042 | else |
| 1043 | return target_id; |
| 1044 | } |
| 1045 | |
| 1046 | /* Like print_thread_info, but in addition, GLOBAL_IDS indicates |
| 1047 | whether REQUESTED_THREADS is a list of global or per-inferior |
| 1048 | thread ids. */ |
| 1049 | |
| 1050 | static void |
| 1051 | print_thread_info_1 (struct ui_out *uiout, const char *requested_threads, |
| 1052 | int global_ids, int pid, |
| 1053 | int show_global_ids) |
| 1054 | { |
| 1055 | int default_inf_num = current_inferior ()->num; |
| 1056 | |
| 1057 | update_thread_list (); |
| 1058 | |
| 1059 | /* Whether we saw any thread. */ |
| 1060 | bool any_thread = false; |
| 1061 | /* Whether the current thread is exited. */ |
| 1062 | bool current_exited = false; |
| 1063 | |
| 1064 | thread_info *current_thread = (inferior_ptid != null_ptid |
| 1065 | ? inferior_thread () : NULL); |
| 1066 | |
| 1067 | { |
| 1068 | /* For backward compatibility, we make a list for MI. A table is |
| 1069 | preferable for the CLI, though, because it shows table |
| 1070 | headers. */ |
| 1071 | gdb::optional<ui_out_emit_list> list_emitter; |
| 1072 | gdb::optional<ui_out_emit_table> table_emitter; |
| 1073 | |
| 1074 | /* We'll be switching threads temporarily below. */ |
| 1075 | scoped_restore_current_thread restore_thread; |
| 1076 | |
| 1077 | if (uiout->is_mi_like_p ()) |
| 1078 | list_emitter.emplace (uiout, "threads"); |
| 1079 | else |
| 1080 | { |
| 1081 | int n_threads = 0; |
| 1082 | /* The width of the "Target Id" column. Grown below to |
| 1083 | accommodate the largest entry. */ |
| 1084 | size_t target_id_col_width = 17; |
| 1085 | |
| 1086 | for (thread_info *tp : all_threads ()) |
| 1087 | { |
| 1088 | if (!should_print_thread (requested_threads, default_inf_num, |
| 1089 | global_ids, pid, tp)) |
| 1090 | continue; |
| 1091 | |
| 1092 | if (!uiout->is_mi_like_p ()) |
| 1093 | { |
| 1094 | /* Switch inferiors so we're looking at the right |
| 1095 | target stack. */ |
| 1096 | switch_to_inferior_no_thread (tp->inf); |
| 1097 | |
| 1098 | target_id_col_width |
| 1099 | = std::max (target_id_col_width, |
| 1100 | thread_target_id_str (tp).size ()); |
| 1101 | } |
| 1102 | |
| 1103 | ++n_threads; |
| 1104 | } |
| 1105 | |
| 1106 | if (n_threads == 0) |
| 1107 | { |
| 1108 | if (requested_threads == NULL || *requested_threads == '\0') |
| 1109 | uiout->message (_("No threads.\n")); |
| 1110 | else |
| 1111 | uiout->message (_("No threads match '%s'.\n"), |
| 1112 | requested_threads); |
| 1113 | return; |
| 1114 | } |
| 1115 | |
| 1116 | table_emitter.emplace (uiout, show_global_ids ? 5 : 4, |
| 1117 | n_threads, "threads"); |
| 1118 | |
| 1119 | uiout->table_header (1, ui_left, "current", ""); |
| 1120 | uiout->table_header (4, ui_left, "id-in-tg", "Id"); |
| 1121 | if (show_global_ids) |
| 1122 | uiout->table_header (4, ui_left, "id", "GId"); |
| 1123 | uiout->table_header (target_id_col_width, ui_left, |
| 1124 | "target-id", "Target Id"); |
| 1125 | uiout->table_header (1, ui_left, "frame", "Frame"); |
| 1126 | uiout->table_body (); |
| 1127 | } |
| 1128 | |
| 1129 | for (inferior *inf : all_inferiors ()) |
| 1130 | for (thread_info *tp : inf->threads ()) |
| 1131 | { |
| 1132 | int core; |
| 1133 | |
| 1134 | any_thread = true; |
| 1135 | if (tp == current_thread && tp->state == THREAD_EXITED) |
| 1136 | current_exited = true; |
| 1137 | |
| 1138 | if (!should_print_thread (requested_threads, default_inf_num, |
| 1139 | global_ids, pid, tp)) |
| 1140 | continue; |
| 1141 | |
| 1142 | ui_out_emit_tuple tuple_emitter (uiout, NULL); |
| 1143 | |
| 1144 | if (!uiout->is_mi_like_p ()) |
| 1145 | { |
| 1146 | if (tp == current_thread) |
| 1147 | uiout->field_string ("current", "*"); |
| 1148 | else |
| 1149 | uiout->field_skip ("current"); |
| 1150 | |
| 1151 | uiout->field_string ("id-in-tg", print_thread_id (tp)); |
| 1152 | } |
| 1153 | |
| 1154 | if (show_global_ids || uiout->is_mi_like_p ()) |
| 1155 | uiout->field_signed ("id", tp->global_num); |
| 1156 | |
| 1157 | /* Switch to the thread (and inferior / target). */ |
| 1158 | switch_to_thread (tp); |
| 1159 | |
| 1160 | /* For the CLI, we stuff everything into the target-id field. |
| 1161 | This is a gross hack to make the output come out looking |
| 1162 | correct. The underlying problem here is that ui-out has no |
| 1163 | way to specify that a field's space allocation should be |
| 1164 | shared by several fields. For MI, we do the right thing |
| 1165 | instead. */ |
| 1166 | |
| 1167 | if (uiout->is_mi_like_p ()) |
| 1168 | { |
| 1169 | uiout->field_string ("target-id", target_pid_to_str (tp->ptid)); |
| 1170 | |
| 1171 | const char *extra_info = target_extra_thread_info (tp); |
| 1172 | if (extra_info != nullptr) |
| 1173 | uiout->field_string ("details", extra_info); |
| 1174 | |
| 1175 | const char *name = (tp->name != nullptr |
| 1176 | ? tp->name |
| 1177 | : target_thread_name (tp)); |
| 1178 | if (name != NULL) |
| 1179 | uiout->field_string ("name", name); |
| 1180 | } |
| 1181 | else |
| 1182 | { |
| 1183 | uiout->field_string ("target-id", |
| 1184 | thread_target_id_str (tp).c_str ()); |
| 1185 | } |
| 1186 | |
| 1187 | if (tp->state == THREAD_RUNNING) |
| 1188 | uiout->text ("(running)\n"); |
| 1189 | else |
| 1190 | { |
| 1191 | /* The switch above put us at the top of the stack (leaf |
| 1192 | frame). */ |
| 1193 | print_stack_frame (get_selected_frame (NULL), |
| 1194 | /* For MI output, print frame level. */ |
| 1195 | uiout->is_mi_like_p (), |
| 1196 | LOCATION, 0); |
| 1197 | } |
| 1198 | |
| 1199 | if (uiout->is_mi_like_p ()) |
| 1200 | { |
| 1201 | const char *state = "stopped"; |
| 1202 | |
| 1203 | if (tp->state == THREAD_RUNNING) |
| 1204 | state = "running"; |
| 1205 | uiout->field_string ("state", state); |
| 1206 | } |
| 1207 | |
| 1208 | core = target_core_of_thread (tp->ptid); |
| 1209 | if (uiout->is_mi_like_p () && core != -1) |
| 1210 | uiout->field_signed ("core", core); |
| 1211 | } |
| 1212 | |
| 1213 | /* This end scope restores the current thread and the frame |
| 1214 | selected before the "info threads" command, and it finishes the |
| 1215 | ui-out list or table. */ |
| 1216 | } |
| 1217 | |
| 1218 | if (pid == -1 && requested_threads == NULL) |
| 1219 | { |
| 1220 | if (uiout->is_mi_like_p () && inferior_ptid != null_ptid) |
| 1221 | uiout->field_signed ("current-thread-id", current_thread->global_num); |
| 1222 | |
| 1223 | if (inferior_ptid != null_ptid && current_exited) |
| 1224 | uiout->message ("\n\ |
| 1225 | The current thread <Thread ID %s> has terminated. See `help thread'.\n", |
| 1226 | print_thread_id (inferior_thread ())); |
| 1227 | else if (any_thread && inferior_ptid == null_ptid) |
| 1228 | uiout->message ("\n\ |
| 1229 | No selected thread. See `help thread'.\n"); |
| 1230 | } |
| 1231 | } |
| 1232 | |
| 1233 | /* See gdbthread.h. */ |
| 1234 | |
| 1235 | void |
| 1236 | print_thread_info (struct ui_out *uiout, const char *requested_threads, |
| 1237 | int pid) |
| 1238 | { |
| 1239 | print_thread_info_1 (uiout, requested_threads, 1, pid, 0); |
| 1240 | } |
| 1241 | |
| 1242 | /* The options for the "info threads" command. */ |
| 1243 | |
| 1244 | struct info_threads_opts |
| 1245 | { |
| 1246 | /* For "-gid". */ |
| 1247 | bool show_global_ids = false; |
| 1248 | }; |
| 1249 | |
| 1250 | static const gdb::option::option_def info_threads_option_defs[] = { |
| 1251 | |
| 1252 | gdb::option::flag_option_def<info_threads_opts> { |
| 1253 | "gid", |
| 1254 | [] (info_threads_opts *opts) { return &opts->show_global_ids; }, |
| 1255 | N_("Show global thread IDs."), |
| 1256 | }, |
| 1257 | |
| 1258 | }; |
| 1259 | |
| 1260 | /* Create an option_def_group for the "info threads" options, with |
| 1261 | IT_OPTS as context. */ |
| 1262 | |
| 1263 | static inline gdb::option::option_def_group |
| 1264 | make_info_threads_options_def_group (info_threads_opts *it_opts) |
| 1265 | { |
| 1266 | return {{info_threads_option_defs}, it_opts}; |
| 1267 | } |
| 1268 | |
| 1269 | /* Implementation of the "info threads" command. |
| 1270 | |
| 1271 | Note: this has the drawback that it _really_ switches |
| 1272 | threads, which frees the frame cache. A no-side |
| 1273 | effects info-threads command would be nicer. */ |
| 1274 | |
| 1275 | static void |
| 1276 | info_threads_command (const char *arg, int from_tty) |
| 1277 | { |
| 1278 | info_threads_opts it_opts; |
| 1279 | |
| 1280 | auto grp = make_info_threads_options_def_group (&it_opts); |
| 1281 | gdb::option::process_options |
| 1282 | (&arg, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_ERROR, grp); |
| 1283 | |
| 1284 | print_thread_info_1 (current_uiout, arg, 0, -1, it_opts.show_global_ids); |
| 1285 | } |
| 1286 | |
| 1287 | /* Completer for the "info threads" command. */ |
| 1288 | |
| 1289 | static void |
| 1290 | info_threads_command_completer (struct cmd_list_element *ignore, |
| 1291 | completion_tracker &tracker, |
| 1292 | const char *text, const char *word_ignored) |
| 1293 | { |
| 1294 | const auto grp = make_info_threads_options_def_group (nullptr); |
| 1295 | |
| 1296 | if (gdb::option::complete_options |
| 1297 | (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_ERROR, grp)) |
| 1298 | return; |
| 1299 | |
| 1300 | /* Convenience to let the user know what the option can accept. */ |
| 1301 | if (*text == '\0') |
| 1302 | { |
| 1303 | gdb::option::complete_on_all_options (tracker, grp); |
| 1304 | /* Keep this "ID" in sync with what "help info threads" |
| 1305 | says. */ |
| 1306 | tracker.add_completion (make_unique_xstrdup ("ID")); |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | /* See gdbthread.h. */ |
| 1311 | |
| 1312 | void |
| 1313 | switch_to_thread_no_regs (struct thread_info *thread) |
| 1314 | { |
| 1315 | struct inferior *inf = thread->inf; |
| 1316 | |
| 1317 | set_current_program_space (inf->pspace); |
| 1318 | set_current_inferior (inf); |
| 1319 | |
| 1320 | inferior_ptid = thread->ptid; |
| 1321 | } |
| 1322 | |
| 1323 | /* See gdbthread.h. */ |
| 1324 | |
| 1325 | void |
| 1326 | switch_to_no_thread () |
| 1327 | { |
| 1328 | if (inferior_ptid == null_ptid) |
| 1329 | return; |
| 1330 | |
| 1331 | inferior_ptid = null_ptid; |
| 1332 | reinit_frame_cache (); |
| 1333 | } |
| 1334 | |
| 1335 | /* See gdbthread.h. */ |
| 1336 | |
| 1337 | void |
| 1338 | switch_to_thread (thread_info *thr) |
| 1339 | { |
| 1340 | gdb_assert (thr != NULL); |
| 1341 | |
| 1342 | if (is_current_thread (thr)) |
| 1343 | return; |
| 1344 | |
| 1345 | switch_to_thread_no_regs (thr); |
| 1346 | |
| 1347 | reinit_frame_cache (); |
| 1348 | } |
| 1349 | |
| 1350 | /* See gdbsupport/common-gdbthread.h. */ |
| 1351 | |
| 1352 | void |
| 1353 | switch_to_thread (process_stratum_target *proc_target, ptid_t ptid) |
| 1354 | { |
| 1355 | thread_info *thr = find_thread_ptid (proc_target, ptid); |
| 1356 | switch_to_thread (thr); |
| 1357 | } |
| 1358 | |
| 1359 | static void |
| 1360 | restore_selected_frame (struct frame_id a_frame_id, int frame_level) |
| 1361 | { |
| 1362 | struct frame_info *frame = NULL; |
| 1363 | int count; |
| 1364 | |
| 1365 | /* This means there was no selected frame. */ |
| 1366 | if (frame_level == -1) |
| 1367 | { |
| 1368 | select_frame (NULL); |
| 1369 | return; |
| 1370 | } |
| 1371 | |
| 1372 | gdb_assert (frame_level >= 0); |
| 1373 | |
| 1374 | /* Restore by level first, check if the frame id is the same as |
| 1375 | expected. If that fails, try restoring by frame id. If that |
| 1376 | fails, nothing to do, just warn the user. */ |
| 1377 | |
| 1378 | count = frame_level; |
| 1379 | frame = find_relative_frame (get_current_frame (), &count); |
| 1380 | if (count == 0 |
| 1381 | && frame != NULL |
| 1382 | /* The frame ids must match - either both valid or both outer_frame_id. |
| 1383 | The latter case is not failsafe, but since it's highly unlikely |
| 1384 | the search by level finds the wrong frame, it's 99.9(9)% of |
| 1385 | the time (for all practical purposes) safe. */ |
| 1386 | && frame_id_eq (get_frame_id (frame), a_frame_id)) |
| 1387 | { |
| 1388 | /* Cool, all is fine. */ |
| 1389 | select_frame (frame); |
| 1390 | return; |
| 1391 | } |
| 1392 | |
| 1393 | frame = frame_find_by_id (a_frame_id); |
| 1394 | if (frame != NULL) |
| 1395 | { |
| 1396 | /* Cool, refound it. */ |
| 1397 | select_frame (frame); |
| 1398 | return; |
| 1399 | } |
| 1400 | |
| 1401 | /* Nothing else to do, the frame layout really changed. Select the |
| 1402 | innermost stack frame. */ |
| 1403 | select_frame (get_current_frame ()); |
| 1404 | |
| 1405 | /* Warn the user. */ |
| 1406 | if (frame_level > 0 && !current_uiout->is_mi_like_p ()) |
| 1407 | { |
| 1408 | warning (_("Couldn't restore frame #%d in " |
| 1409 | "current thread. Bottom (innermost) frame selected:"), |
| 1410 | frame_level); |
| 1411 | /* For MI, we should probably have a notification about |
| 1412 | current frame change. But this error is not very |
| 1413 | likely, so don't bother for now. */ |
| 1414 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); |
| 1415 | } |
| 1416 | } |
| 1417 | |
| 1418 | void |
| 1419 | scoped_restore_current_thread::restore () |
| 1420 | { |
| 1421 | /* If an entry of thread_info was previously selected, it won't be |
| 1422 | deleted because we've increased its refcount. The thread represented |
| 1423 | by this thread_info entry may have already exited (due to normal exit, |
| 1424 | detach, etc), so the thread_info.state is THREAD_EXITED. */ |
| 1425 | if (m_thread != NULL |
| 1426 | /* If the previously selected thread belonged to a process that has |
| 1427 | in the mean time exited (or killed, detached, etc.), then don't revert |
| 1428 | back to it, but instead simply drop back to no thread selected. */ |
| 1429 | && m_inf->pid != 0) |
| 1430 | switch_to_thread (m_thread); |
| 1431 | else |
| 1432 | switch_to_inferior_no_thread (m_inf); |
| 1433 | |
| 1434 | /* The running state of the originally selected thread may have |
| 1435 | changed, so we have to recheck it here. */ |
| 1436 | if (inferior_ptid != null_ptid |
| 1437 | && m_was_stopped |
| 1438 | && m_thread->state == THREAD_STOPPED |
| 1439 | && target_has_registers |
| 1440 | && target_has_stack |
| 1441 | && target_has_memory) |
| 1442 | restore_selected_frame (m_selected_frame_id, m_selected_frame_level); |
| 1443 | } |
| 1444 | |
| 1445 | scoped_restore_current_thread::~scoped_restore_current_thread () |
| 1446 | { |
| 1447 | if (!m_dont_restore) |
| 1448 | { |
| 1449 | try |
| 1450 | { |
| 1451 | restore (); |
| 1452 | } |
| 1453 | catch (const gdb_exception &ex) |
| 1454 | { |
| 1455 | /* We're in a dtor, there's really nothing else we can do |
| 1456 | but swallow the exception. */ |
| 1457 | } |
| 1458 | } |
| 1459 | |
| 1460 | if (m_thread != NULL) |
| 1461 | m_thread->decref (); |
| 1462 | m_inf->decref (); |
| 1463 | } |
| 1464 | |
| 1465 | scoped_restore_current_thread::scoped_restore_current_thread () |
| 1466 | { |
| 1467 | m_thread = NULL; |
| 1468 | m_inf = current_inferior (); |
| 1469 | |
| 1470 | if (inferior_ptid != null_ptid) |
| 1471 | { |
| 1472 | thread_info *tp = inferior_thread (); |
| 1473 | struct frame_info *frame; |
| 1474 | |
| 1475 | m_was_stopped = tp->state == THREAD_STOPPED; |
| 1476 | if (m_was_stopped |
| 1477 | && target_has_registers |
| 1478 | && target_has_stack |
| 1479 | && target_has_memory) |
| 1480 | { |
| 1481 | /* When processing internal events, there might not be a |
| 1482 | selected frame. If we naively call get_selected_frame |
| 1483 | here, then we can end up reading debuginfo for the |
| 1484 | current frame, but we don't generally need the debuginfo |
| 1485 | at this point. */ |
| 1486 | frame = get_selected_frame_if_set (); |
| 1487 | } |
| 1488 | else |
| 1489 | frame = NULL; |
| 1490 | |
| 1491 | try |
| 1492 | { |
| 1493 | m_selected_frame_id = get_frame_id (frame); |
| 1494 | m_selected_frame_level = frame_relative_level (frame); |
| 1495 | } |
| 1496 | catch (const gdb_exception_error &ex) |
| 1497 | { |
| 1498 | m_selected_frame_id = null_frame_id; |
| 1499 | m_selected_frame_level = -1; |
| 1500 | } |
| 1501 | |
| 1502 | tp->incref (); |
| 1503 | m_thread = tp; |
| 1504 | } |
| 1505 | |
| 1506 | m_inf->incref (); |
| 1507 | } |
| 1508 | |
| 1509 | /* See gdbthread.h. */ |
| 1510 | |
| 1511 | int |
| 1512 | show_thread_that_caused_stop (void) |
| 1513 | { |
| 1514 | return highest_thread_num > 1; |
| 1515 | } |
| 1516 | |
| 1517 | /* See gdbthread.h. */ |
| 1518 | |
| 1519 | int |
| 1520 | show_inferior_qualified_tids (void) |
| 1521 | { |
| 1522 | return (inferior_list->next != NULL || inferior_list->num != 1); |
| 1523 | } |
| 1524 | |
| 1525 | /* See gdbthread.h. */ |
| 1526 | |
| 1527 | const char * |
| 1528 | print_thread_id (struct thread_info *thr) |
| 1529 | { |
| 1530 | char *s = get_print_cell (); |
| 1531 | |
| 1532 | if (show_inferior_qualified_tids ()) |
| 1533 | xsnprintf (s, PRINT_CELL_SIZE, "%d.%d", thr->inf->num, thr->per_inf_num); |
| 1534 | else |
| 1535 | xsnprintf (s, PRINT_CELL_SIZE, "%d", thr->per_inf_num); |
| 1536 | return s; |
| 1537 | } |
| 1538 | |
| 1539 | /* Sort an array of struct thread_info pointers by thread ID (first by |
| 1540 | inferior number, and then by per-inferior thread number). Sorts in |
| 1541 | ascending order. */ |
| 1542 | |
| 1543 | static bool |
| 1544 | tp_array_compar_ascending (const thread_info *a, const thread_info *b) |
| 1545 | { |
| 1546 | if (a->inf->num != b->inf->num) |
| 1547 | return a->inf->num < b->inf->num; |
| 1548 | |
| 1549 | return (a->per_inf_num < b->per_inf_num); |
| 1550 | } |
| 1551 | |
| 1552 | /* Sort an array of struct thread_info pointers by thread ID (first by |
| 1553 | inferior number, and then by per-inferior thread number). Sorts in |
| 1554 | descending order. */ |
| 1555 | |
| 1556 | static bool |
| 1557 | tp_array_compar_descending (const thread_info *a, const thread_info *b) |
| 1558 | { |
| 1559 | if (a->inf->num != b->inf->num) |
| 1560 | return a->inf->num > b->inf->num; |
| 1561 | |
| 1562 | return (a->per_inf_num > b->per_inf_num); |
| 1563 | } |
| 1564 | |
| 1565 | /* Switch to thread THR and execute CMD. |
| 1566 | FLAGS.QUIET controls the printing of the thread information. |
| 1567 | FLAGS.CONT and FLAGS.SILENT control how to handle errors. */ |
| 1568 | |
| 1569 | static void |
| 1570 | thr_try_catch_cmd (thread_info *thr, const char *cmd, int from_tty, |
| 1571 | const qcs_flags &flags) |
| 1572 | { |
| 1573 | switch_to_thread (thr); |
| 1574 | |
| 1575 | /* The thread header is computed before running the command since |
| 1576 | the command can change the inferior, which is not permitted |
| 1577 | by thread_target_id_str. */ |
| 1578 | std::string thr_header = |
| 1579 | string_printf (_("\nThread %s (%s):\n"), print_thread_id (thr), |
| 1580 | thread_target_id_str (thr).c_str ()); |
| 1581 | |
| 1582 | try |
| 1583 | { |
| 1584 | std::string cmd_result = execute_command_to_string |
| 1585 | (cmd, from_tty, gdb_stdout->term_out ()); |
| 1586 | if (!flags.silent || cmd_result.length () > 0) |
| 1587 | { |
| 1588 | if (!flags.quiet) |
| 1589 | printf_filtered ("%s", thr_header.c_str ()); |
| 1590 | printf_filtered ("%s", cmd_result.c_str ()); |
| 1591 | } |
| 1592 | } |
| 1593 | catch (const gdb_exception_error &ex) |
| 1594 | { |
| 1595 | if (!flags.silent) |
| 1596 | { |
| 1597 | if (!flags.quiet) |
| 1598 | printf_filtered ("%s", thr_header.c_str ()); |
| 1599 | if (flags.cont) |
| 1600 | printf_filtered ("%s\n", ex.what ()); |
| 1601 | else |
| 1602 | throw; |
| 1603 | } |
| 1604 | } |
| 1605 | } |
| 1606 | |
| 1607 | /* Option definition of "thread apply"'s "-ascending" option. */ |
| 1608 | |
| 1609 | static const gdb::option::flag_option_def<> ascending_option_def = { |
| 1610 | "ascending", |
| 1611 | N_("\ |
| 1612 | Call COMMAND for all threads in ascending order.\n\ |
| 1613 | The default is descending order."), |
| 1614 | }; |
| 1615 | |
| 1616 | /* The qcs command line flags for the "thread apply" commands. Keep |
| 1617 | this in sync with the "frame apply" commands. */ |
| 1618 | |
| 1619 | using qcs_flag_option_def |
| 1620 | = gdb::option::flag_option_def<qcs_flags>; |
| 1621 | |
| 1622 | static const gdb::option::option_def thr_qcs_flags_option_defs[] = { |
| 1623 | qcs_flag_option_def { |
| 1624 | "q", [] (qcs_flags *opt) { return &opt->quiet; }, |
| 1625 | N_("Disables printing the thread information."), |
| 1626 | }, |
| 1627 | |
| 1628 | qcs_flag_option_def { |
| 1629 | "c", [] (qcs_flags *opt) { return &opt->cont; }, |
| 1630 | N_("Print any error raised by COMMAND and continue."), |
| 1631 | }, |
| 1632 | |
| 1633 | qcs_flag_option_def { |
| 1634 | "s", [] (qcs_flags *opt) { return &opt->silent; }, |
| 1635 | N_("Silently ignore any errors or empty output produced by COMMAND."), |
| 1636 | }, |
| 1637 | }; |
| 1638 | |
| 1639 | /* Create an option_def_group for the "thread apply all" options, with |
| 1640 | ASCENDING and FLAGS as context. */ |
| 1641 | |
| 1642 | static inline std::array<gdb::option::option_def_group, 2> |
| 1643 | make_thread_apply_all_options_def_group (bool *ascending, |
| 1644 | qcs_flags *flags) |
| 1645 | { |
| 1646 | return {{ |
| 1647 | { {ascending_option_def.def ()}, ascending}, |
| 1648 | { {thr_qcs_flags_option_defs}, flags }, |
| 1649 | }}; |
| 1650 | } |
| 1651 | |
| 1652 | /* Create an option_def_group for the "thread apply" options, with |
| 1653 | FLAGS as context. */ |
| 1654 | |
| 1655 | static inline gdb::option::option_def_group |
| 1656 | make_thread_apply_options_def_group (qcs_flags *flags) |
| 1657 | { |
| 1658 | return {{thr_qcs_flags_option_defs}, flags}; |
| 1659 | } |
| 1660 | |
| 1661 | /* Apply a GDB command to a list of threads. List syntax is a whitespace |
| 1662 | separated list of numbers, or ranges, or the keyword `all'. Ranges consist |
| 1663 | of two numbers separated by a hyphen. Examples: |
| 1664 | |
| 1665 | thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4 |
| 1666 | thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9 |
| 1667 | thread apply all x/i $pc Apply x/i $pc cmd to all threads. */ |
| 1668 | |
| 1669 | static void |
| 1670 | thread_apply_all_command (const char *cmd, int from_tty) |
| 1671 | { |
| 1672 | bool ascending = false; |
| 1673 | qcs_flags flags; |
| 1674 | |
| 1675 | auto group = make_thread_apply_all_options_def_group (&ascending, |
| 1676 | &flags); |
| 1677 | gdb::option::process_options |
| 1678 | (&cmd, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group); |
| 1679 | |
| 1680 | validate_flags_qcs ("thread apply all", &flags); |
| 1681 | |
| 1682 | if (cmd == NULL || *cmd == '\000') |
| 1683 | error (_("Please specify a command at the end of 'thread apply all'")); |
| 1684 | |
| 1685 | update_thread_list (); |
| 1686 | |
| 1687 | int tc = live_threads_count (); |
| 1688 | if (tc != 0) |
| 1689 | { |
| 1690 | /* Save a copy of the thread list and increment each thread's |
| 1691 | refcount while executing the command in the context of each |
| 1692 | thread, in case the command is one that wipes threads. E.g., |
| 1693 | detach, kill, disconnect, etc., or even normally continuing |
| 1694 | over an inferior or thread exit. */ |
| 1695 | std::vector<thread_info *> thr_list_cpy; |
| 1696 | thr_list_cpy.reserve (tc); |
| 1697 | |
| 1698 | for (thread_info *tp : all_non_exited_threads ()) |
| 1699 | thr_list_cpy.push_back (tp); |
| 1700 | gdb_assert (thr_list_cpy.size () == tc); |
| 1701 | |
| 1702 | /* Increment the refcounts, and restore them back on scope |
| 1703 | exit. */ |
| 1704 | scoped_inc_dec_ref inc_dec_ref (thr_list_cpy); |
| 1705 | |
| 1706 | auto *sorter = (ascending |
| 1707 | ? tp_array_compar_ascending |
| 1708 | : tp_array_compar_descending); |
| 1709 | std::sort (thr_list_cpy.begin (), thr_list_cpy.end (), sorter); |
| 1710 | |
| 1711 | scoped_restore_current_thread restore_thread; |
| 1712 | |
| 1713 | for (thread_info *thr : thr_list_cpy) |
| 1714 | if (switch_to_thread_if_alive (thr)) |
| 1715 | thr_try_catch_cmd (thr, cmd, from_tty, flags); |
| 1716 | } |
| 1717 | } |
| 1718 | |
| 1719 | /* Completer for "thread apply [ID list]". */ |
| 1720 | |
| 1721 | static void |
| 1722 | thread_apply_command_completer (cmd_list_element *ignore, |
| 1723 | completion_tracker &tracker, |
| 1724 | const char *text, const char * /*word*/) |
| 1725 | { |
| 1726 | /* Don't leave this to complete_options because there's an early |
| 1727 | return below. */ |
| 1728 | tracker.set_use_custom_word_point (true); |
| 1729 | |
| 1730 | tid_range_parser parser; |
| 1731 | parser.init (text, current_inferior ()->num); |
| 1732 | |
| 1733 | try |
| 1734 | { |
| 1735 | while (!parser.finished ()) |
| 1736 | { |
| 1737 | int inf_num, thr_start, thr_end; |
| 1738 | |
| 1739 | if (!parser.get_tid_range (&inf_num, &thr_start, &thr_end)) |
| 1740 | break; |
| 1741 | |
| 1742 | if (parser.in_star_range () || parser.in_thread_range ()) |
| 1743 | parser.skip_range (); |
| 1744 | } |
| 1745 | } |
| 1746 | catch (const gdb_exception_error &ex) |
| 1747 | { |
| 1748 | /* get_tid_range throws if it parses a negative number, for |
| 1749 | example. But a seemingly negative number may be the start of |
| 1750 | an option instead. */ |
| 1751 | } |
| 1752 | |
| 1753 | const char *cmd = parser.cur_tok (); |
| 1754 | |
| 1755 | if (cmd == text) |
| 1756 | { |
| 1757 | /* No thread ID list yet. */ |
| 1758 | return; |
| 1759 | } |
| 1760 | |
| 1761 | /* Check if we're past a valid thread ID list already. */ |
| 1762 | if (parser.finished () |
| 1763 | && cmd > text && !isspace (cmd[-1])) |
| 1764 | return; |
| 1765 | |
| 1766 | /* We're past the thread ID list, advance word point. */ |
| 1767 | tracker.advance_custom_word_point_by (cmd - text); |
| 1768 | text = cmd; |
| 1769 | |
| 1770 | const auto group = make_thread_apply_options_def_group (nullptr); |
| 1771 | if (gdb::option::complete_options |
| 1772 | (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group)) |
| 1773 | return; |
| 1774 | |
| 1775 | complete_nested_command_line (tracker, text); |
| 1776 | } |
| 1777 | |
| 1778 | /* Completer for "thread apply all". */ |
| 1779 | |
| 1780 | static void |
| 1781 | thread_apply_all_command_completer (cmd_list_element *ignore, |
| 1782 | completion_tracker &tracker, |
| 1783 | const char *text, const char *word) |
| 1784 | { |
| 1785 | const auto group = make_thread_apply_all_options_def_group (nullptr, |
| 1786 | nullptr); |
| 1787 | if (gdb::option::complete_options |
| 1788 | (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group)) |
| 1789 | return; |
| 1790 | |
| 1791 | complete_nested_command_line (tracker, text); |
| 1792 | } |
| 1793 | |
| 1794 | /* Implementation of the "thread apply" command. */ |
| 1795 | |
| 1796 | static void |
| 1797 | thread_apply_command (const char *tidlist, int from_tty) |
| 1798 | { |
| 1799 | qcs_flags flags; |
| 1800 | const char *cmd = NULL; |
| 1801 | tid_range_parser parser; |
| 1802 | |
| 1803 | if (tidlist == NULL || *tidlist == '\000') |
| 1804 | error (_("Please specify a thread ID list")); |
| 1805 | |
| 1806 | parser.init (tidlist, current_inferior ()->num); |
| 1807 | while (!parser.finished ()) |
| 1808 | { |
| 1809 | int inf_num, thr_start, thr_end; |
| 1810 | |
| 1811 | if (!parser.get_tid_range (&inf_num, &thr_start, &thr_end)) |
| 1812 | break; |
| 1813 | } |
| 1814 | |
| 1815 | cmd = parser.cur_tok (); |
| 1816 | |
| 1817 | auto group = make_thread_apply_options_def_group (&flags); |
| 1818 | gdb::option::process_options |
| 1819 | (&cmd, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group); |
| 1820 | |
| 1821 | validate_flags_qcs ("thread apply", &flags); |
| 1822 | |
| 1823 | if (*cmd == '\0') |
| 1824 | error (_("Please specify a command following the thread ID list")); |
| 1825 | |
| 1826 | if (tidlist == cmd || isdigit (cmd[0])) |
| 1827 | invalid_thread_id_error (cmd); |
| 1828 | |
| 1829 | scoped_restore_current_thread restore_thread; |
| 1830 | |
| 1831 | parser.init (tidlist, current_inferior ()->num); |
| 1832 | while (!parser.finished ()) |
| 1833 | { |
| 1834 | struct thread_info *tp = NULL; |
| 1835 | struct inferior *inf; |
| 1836 | int inf_num, thr_num; |
| 1837 | |
| 1838 | parser.get_tid (&inf_num, &thr_num); |
| 1839 | inf = find_inferior_id (inf_num); |
| 1840 | if (inf != NULL) |
| 1841 | tp = find_thread_id (inf, thr_num); |
| 1842 | |
| 1843 | if (parser.in_star_range ()) |
| 1844 | { |
| 1845 | if (inf == NULL) |
| 1846 | { |
| 1847 | warning (_("Unknown inferior %d"), inf_num); |
| 1848 | parser.skip_range (); |
| 1849 | continue; |
| 1850 | } |
| 1851 | |
| 1852 | /* No use looking for threads past the highest thread number |
| 1853 | the inferior ever had. */ |
| 1854 | if (thr_num >= inf->highest_thread_num) |
| 1855 | parser.skip_range (); |
| 1856 | |
| 1857 | /* Be quiet about unknown threads numbers. */ |
| 1858 | if (tp == NULL) |
| 1859 | continue; |
| 1860 | } |
| 1861 | |
| 1862 | if (tp == NULL) |
| 1863 | { |
| 1864 | if (show_inferior_qualified_tids () || parser.tid_is_qualified ()) |
| 1865 | warning (_("Unknown thread %d.%d"), inf_num, thr_num); |
| 1866 | else |
| 1867 | warning (_("Unknown thread %d"), thr_num); |
| 1868 | continue; |
| 1869 | } |
| 1870 | |
| 1871 | if (!switch_to_thread_if_alive (tp)) |
| 1872 | { |
| 1873 | warning (_("Thread %s has terminated."), print_thread_id (tp)); |
| 1874 | continue; |
| 1875 | } |
| 1876 | |
| 1877 | thr_try_catch_cmd (tp, cmd, from_tty, flags); |
| 1878 | } |
| 1879 | } |
| 1880 | |
| 1881 | |
| 1882 | /* Implementation of the "taas" command. */ |
| 1883 | |
| 1884 | static void |
| 1885 | taas_command (const char *cmd, int from_tty) |
| 1886 | { |
| 1887 | if (cmd == NULL || *cmd == '\0') |
| 1888 | error (_("Please specify a command to apply on all threads")); |
| 1889 | std::string expanded = std::string ("thread apply all -s ") + cmd; |
| 1890 | execute_command (expanded.c_str (), from_tty); |
| 1891 | } |
| 1892 | |
| 1893 | /* Implementation of the "tfaas" command. */ |
| 1894 | |
| 1895 | static void |
| 1896 | tfaas_command (const char *cmd, int from_tty) |
| 1897 | { |
| 1898 | if (cmd == NULL || *cmd == '\0') |
| 1899 | error (_("Please specify a command to apply on all frames of all threads")); |
| 1900 | std::string expanded |
| 1901 | = std::string ("thread apply all -s -- frame apply all -s ") + cmd; |
| 1902 | execute_command (expanded.c_str (), from_tty); |
| 1903 | } |
| 1904 | |
| 1905 | /* Switch to the specified thread, or print the current thread. */ |
| 1906 | |
| 1907 | void |
| 1908 | thread_command (const char *tidstr, int from_tty) |
| 1909 | { |
| 1910 | if (tidstr == NULL) |
| 1911 | { |
| 1912 | if (inferior_ptid == null_ptid) |
| 1913 | error (_("No thread selected")); |
| 1914 | |
| 1915 | if (target_has_stack) |
| 1916 | { |
| 1917 | struct thread_info *tp = inferior_thread (); |
| 1918 | |
| 1919 | if (tp->state == THREAD_EXITED) |
| 1920 | printf_filtered (_("[Current thread is %s (%s) (exited)]\n"), |
| 1921 | print_thread_id (tp), |
| 1922 | target_pid_to_str (inferior_ptid).c_str ()); |
| 1923 | else |
| 1924 | printf_filtered (_("[Current thread is %s (%s)]\n"), |
| 1925 | print_thread_id (tp), |
| 1926 | target_pid_to_str (inferior_ptid).c_str ()); |
| 1927 | } |
| 1928 | else |
| 1929 | error (_("No stack.")); |
| 1930 | } |
| 1931 | else |
| 1932 | { |
| 1933 | ptid_t previous_ptid = inferior_ptid; |
| 1934 | |
| 1935 | thread_select (tidstr, parse_thread_id (tidstr, NULL)); |
| 1936 | |
| 1937 | /* Print if the thread has not changed, otherwise an event will |
| 1938 | be sent. */ |
| 1939 | if (inferior_ptid == previous_ptid) |
| 1940 | { |
| 1941 | print_selected_thread_frame (current_uiout, |
| 1942 | USER_SELECTED_THREAD |
| 1943 | | USER_SELECTED_FRAME); |
| 1944 | } |
| 1945 | else |
| 1946 | { |
| 1947 | gdb::observers::user_selected_context_changed.notify |
| 1948 | (USER_SELECTED_THREAD | USER_SELECTED_FRAME); |
| 1949 | } |
| 1950 | } |
| 1951 | } |
| 1952 | |
| 1953 | /* Implementation of `thread name'. */ |
| 1954 | |
| 1955 | static void |
| 1956 | thread_name_command (const char *arg, int from_tty) |
| 1957 | { |
| 1958 | struct thread_info *info; |
| 1959 | |
| 1960 | if (inferior_ptid == null_ptid) |
| 1961 | error (_("No thread selected")); |
| 1962 | |
| 1963 | arg = skip_spaces (arg); |
| 1964 | |
| 1965 | info = inferior_thread (); |
| 1966 | xfree (info->name); |
| 1967 | info->name = arg ? xstrdup (arg) : NULL; |
| 1968 | } |
| 1969 | |
| 1970 | /* Find thread ids with a name, target pid, or extra info matching ARG. */ |
| 1971 | |
| 1972 | static void |
| 1973 | thread_find_command (const char *arg, int from_tty) |
| 1974 | { |
| 1975 | const char *tmp; |
| 1976 | unsigned long match = 0; |
| 1977 | |
| 1978 | if (arg == NULL || *arg == '\0') |
| 1979 | error (_("Command requires an argument.")); |
| 1980 | |
| 1981 | tmp = re_comp (arg); |
| 1982 | if (tmp != 0) |
| 1983 | error (_("Invalid regexp (%s): %s"), tmp, arg); |
| 1984 | |
| 1985 | update_thread_list (); |
| 1986 | for (thread_info *tp : all_threads ()) |
| 1987 | { |
| 1988 | if (tp->name != NULL && re_exec (tp->name)) |
| 1989 | { |
| 1990 | printf_filtered (_("Thread %s has name '%s'\n"), |
| 1991 | print_thread_id (tp), tp->name); |
| 1992 | match++; |
| 1993 | } |
| 1994 | |
| 1995 | tmp = target_thread_name (tp); |
| 1996 | if (tmp != NULL && re_exec (tmp)) |
| 1997 | { |
| 1998 | printf_filtered (_("Thread %s has target name '%s'\n"), |
| 1999 | print_thread_id (tp), tmp); |
| 2000 | match++; |
| 2001 | } |
| 2002 | |
| 2003 | std::string name = target_pid_to_str (tp->ptid); |
| 2004 | if (!name.empty () && re_exec (name.c_str ())) |
| 2005 | { |
| 2006 | printf_filtered (_("Thread %s has target id '%s'\n"), |
| 2007 | print_thread_id (tp), name.c_str ()); |
| 2008 | match++; |
| 2009 | } |
| 2010 | |
| 2011 | tmp = target_extra_thread_info (tp); |
| 2012 | if (tmp != NULL && re_exec (tmp)) |
| 2013 | { |
| 2014 | printf_filtered (_("Thread %s has extra info '%s'\n"), |
| 2015 | print_thread_id (tp), tmp); |
| 2016 | match++; |
| 2017 | } |
| 2018 | } |
| 2019 | if (!match) |
| 2020 | printf_filtered (_("No threads match '%s'\n"), arg); |
| 2021 | } |
| 2022 | |
| 2023 | /* Print notices when new threads are attached and detached. */ |
| 2024 | bool print_thread_events = true; |
| 2025 | static void |
| 2026 | show_print_thread_events (struct ui_file *file, int from_tty, |
| 2027 | struct cmd_list_element *c, const char *value) |
| 2028 | { |
| 2029 | fprintf_filtered (file, |
| 2030 | _("Printing of thread events is %s.\n"), |
| 2031 | value); |
| 2032 | } |
| 2033 | |
| 2034 | /* See gdbthread.h. */ |
| 2035 | |
| 2036 | void |
| 2037 | thread_select (const char *tidstr, thread_info *tp) |
| 2038 | { |
| 2039 | if (!switch_to_thread_if_alive (tp)) |
| 2040 | error (_("Thread ID %s has terminated."), tidstr); |
| 2041 | |
| 2042 | annotate_thread_changed (); |
| 2043 | |
| 2044 | /* Since the current thread may have changed, see if there is any |
| 2045 | exited thread we can now delete. */ |
| 2046 | prune_threads (); |
| 2047 | } |
| 2048 | |
| 2049 | /* Print thread and frame switch command response. */ |
| 2050 | |
| 2051 | void |
| 2052 | print_selected_thread_frame (struct ui_out *uiout, |
| 2053 | user_selected_what selection) |
| 2054 | { |
| 2055 | struct thread_info *tp = inferior_thread (); |
| 2056 | |
| 2057 | if (selection & USER_SELECTED_THREAD) |
| 2058 | { |
| 2059 | if (uiout->is_mi_like_p ()) |
| 2060 | { |
| 2061 | uiout->field_signed ("new-thread-id", |
| 2062 | inferior_thread ()->global_num); |
| 2063 | } |
| 2064 | else |
| 2065 | { |
| 2066 | uiout->text ("[Switching to thread "); |
| 2067 | uiout->field_string ("new-thread-id", print_thread_id (tp)); |
| 2068 | uiout->text (" ("); |
| 2069 | uiout->text (target_pid_to_str (inferior_ptid).c_str ()); |
| 2070 | uiout->text (")]"); |
| 2071 | } |
| 2072 | } |
| 2073 | |
| 2074 | if (tp->state == THREAD_RUNNING) |
| 2075 | { |
| 2076 | if (selection & USER_SELECTED_THREAD) |
| 2077 | uiout->text ("(running)\n"); |
| 2078 | } |
| 2079 | else if (selection & USER_SELECTED_FRAME) |
| 2080 | { |
| 2081 | if (selection & USER_SELECTED_THREAD) |
| 2082 | uiout->text ("\n"); |
| 2083 | |
| 2084 | if (has_stack_frames ()) |
| 2085 | print_stack_frame_to_uiout (uiout, get_selected_frame (NULL), |
| 2086 | 1, SRC_AND_LOC, 1); |
| 2087 | } |
| 2088 | } |
| 2089 | |
| 2090 | /* Update the 'threads_executing' global based on the threads we know |
| 2091 | about right now. This is used by infrun to tell whether we should |
| 2092 | pull events out of the current target. */ |
| 2093 | |
| 2094 | static void |
| 2095 | update_threads_executing (void) |
| 2096 | { |
| 2097 | process_stratum_target *targ = current_inferior ()->process_target (); |
| 2098 | |
| 2099 | if (targ == NULL) |
| 2100 | return; |
| 2101 | |
| 2102 | targ->threads_executing = false; |
| 2103 | |
| 2104 | for (inferior *inf : all_non_exited_inferiors (targ)) |
| 2105 | { |
| 2106 | if (!inf->has_execution ()) |
| 2107 | continue; |
| 2108 | |
| 2109 | /* If the process has no threads, then it must be we have a |
| 2110 | process-exit event pending. */ |
| 2111 | if (inf->thread_list == NULL) |
| 2112 | { |
| 2113 | targ->threads_executing = true; |
| 2114 | return; |
| 2115 | } |
| 2116 | |
| 2117 | for (thread_info *tp : inf->non_exited_threads ()) |
| 2118 | { |
| 2119 | if (tp->executing) |
| 2120 | { |
| 2121 | targ->threads_executing = true; |
| 2122 | return; |
| 2123 | } |
| 2124 | } |
| 2125 | } |
| 2126 | } |
| 2127 | |
| 2128 | void |
| 2129 | update_thread_list (void) |
| 2130 | { |
| 2131 | target_update_thread_list (); |
| 2132 | update_threads_executing (); |
| 2133 | } |
| 2134 | |
| 2135 | /* Return a new value for the selected thread's id. Return a value of |
| 2136 | 0 if no thread is selected. If GLOBAL is true, return the thread's |
| 2137 | global number. Otherwise return the per-inferior number. */ |
| 2138 | |
| 2139 | static struct value * |
| 2140 | thread_num_make_value_helper (struct gdbarch *gdbarch, int global) |
| 2141 | { |
| 2142 | int int_val; |
| 2143 | |
| 2144 | if (inferior_ptid == null_ptid) |
| 2145 | int_val = 0; |
| 2146 | else |
| 2147 | { |
| 2148 | thread_info *tp = inferior_thread (); |
| 2149 | if (global) |
| 2150 | int_val = tp->global_num; |
| 2151 | else |
| 2152 | int_val = tp->per_inf_num; |
| 2153 | } |
| 2154 | |
| 2155 | return value_from_longest (builtin_type (gdbarch)->builtin_int, int_val); |
| 2156 | } |
| 2157 | |
| 2158 | /* Return a new value for the selected thread's per-inferior thread |
| 2159 | number. Return a value of 0 if no thread is selected, or no |
| 2160 | threads exist. */ |
| 2161 | |
| 2162 | static struct value * |
| 2163 | thread_id_per_inf_num_make_value (struct gdbarch *gdbarch, |
| 2164 | struct internalvar *var, |
| 2165 | void *ignore) |
| 2166 | { |
| 2167 | return thread_num_make_value_helper (gdbarch, 0); |
| 2168 | } |
| 2169 | |
| 2170 | /* Return a new value for the selected thread's global id. Return a |
| 2171 | value of 0 if no thread is selected, or no threads exist. */ |
| 2172 | |
| 2173 | static struct value * |
| 2174 | global_thread_id_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
| 2175 | void *ignore) |
| 2176 | { |
| 2177 | return thread_num_make_value_helper (gdbarch, 1); |
| 2178 | } |
| 2179 | |
| 2180 | /* Commands with a prefix of `thread'. */ |
| 2181 | struct cmd_list_element *thread_cmd_list = NULL; |
| 2182 | |
| 2183 | /* Implementation of `thread' variable. */ |
| 2184 | |
| 2185 | static const struct internalvar_funcs thread_funcs = |
| 2186 | { |
| 2187 | thread_id_per_inf_num_make_value, |
| 2188 | NULL, |
| 2189 | NULL |
| 2190 | }; |
| 2191 | |
| 2192 | /* Implementation of `gthread' variable. */ |
| 2193 | |
| 2194 | static const struct internalvar_funcs gthread_funcs = |
| 2195 | { |
| 2196 | global_thread_id_make_value, |
| 2197 | NULL, |
| 2198 | NULL |
| 2199 | }; |
| 2200 | |
| 2201 | void _initialize_thread (); |
| 2202 | void |
| 2203 | _initialize_thread () |
| 2204 | { |
| 2205 | static struct cmd_list_element *thread_apply_list = NULL; |
| 2206 | cmd_list_element *c; |
| 2207 | |
| 2208 | const auto info_threads_opts = make_info_threads_options_def_group (nullptr); |
| 2209 | |
| 2210 | /* Note: keep this "ID" in sync with what "info threads [TAB]" |
| 2211 | suggests. */ |
| 2212 | static std::string info_threads_help |
| 2213 | = gdb::option::build_help (_("\ |
| 2214 | Display currently known threads.\n\ |
| 2215 | Usage: info threads [OPTION]... [ID]...\n\ |
| 2216 | \n\ |
| 2217 | Options:\n\ |
| 2218 | %OPTIONS%\ |
| 2219 | If ID is given, it is a space-separated list of IDs of threads to display.\n\ |
| 2220 | Otherwise, all threads are displayed."), |
| 2221 | info_threads_opts); |
| 2222 | |
| 2223 | c = add_info ("threads", info_threads_command, info_threads_help.c_str ()); |
| 2224 | set_cmd_completer_handle_brkchars (c, info_threads_command_completer); |
| 2225 | |
| 2226 | add_prefix_cmd ("thread", class_run, thread_command, _("\ |
| 2227 | Use this command to switch between threads.\n\ |
| 2228 | The new thread ID must be currently known."), |
| 2229 | &thread_cmd_list, "thread ", 1, &cmdlist); |
| 2230 | |
| 2231 | #define THREAD_APPLY_OPTION_HELP "\ |
| 2232 | Prints per-inferior thread number and target system's thread id\n\ |
| 2233 | followed by COMMAND output.\n\ |
| 2234 | \n\ |
| 2235 | By default, an error raised during the execution of COMMAND\n\ |
| 2236 | aborts \"thread apply\".\n\ |
| 2237 | \n\ |
| 2238 | Options:\n\ |
| 2239 | %OPTIONS%" |
| 2240 | |
| 2241 | const auto thread_apply_opts = make_thread_apply_options_def_group (nullptr); |
| 2242 | |
| 2243 | static std::string thread_apply_help = gdb::option::build_help (_("\ |
| 2244 | Apply a command to a list of threads.\n\ |
| 2245 | Usage: thread apply ID... [OPTION]... COMMAND\n\ |
| 2246 | ID is a space-separated list of IDs of threads to apply COMMAND on.\n" |
| 2247 | THREAD_APPLY_OPTION_HELP), |
| 2248 | thread_apply_opts); |
| 2249 | |
| 2250 | c = add_prefix_cmd ("apply", class_run, thread_apply_command, |
| 2251 | thread_apply_help.c_str (), |
| 2252 | &thread_apply_list, "thread apply ", 1, |
| 2253 | &thread_cmd_list); |
| 2254 | set_cmd_completer_handle_brkchars (c, thread_apply_command_completer); |
| 2255 | |
| 2256 | const auto thread_apply_all_opts |
| 2257 | = make_thread_apply_all_options_def_group (nullptr, nullptr); |
| 2258 | |
| 2259 | static std::string thread_apply_all_help = gdb::option::build_help (_("\ |
| 2260 | Apply a command to all threads.\n\ |
| 2261 | \n\ |
| 2262 | Usage: thread apply all [OPTION]... COMMAND\n" |
| 2263 | THREAD_APPLY_OPTION_HELP), |
| 2264 | thread_apply_all_opts); |
| 2265 | |
| 2266 | c = add_cmd ("all", class_run, thread_apply_all_command, |
| 2267 | thread_apply_all_help.c_str (), |
| 2268 | &thread_apply_list); |
| 2269 | set_cmd_completer_handle_brkchars (c, thread_apply_all_command_completer); |
| 2270 | |
| 2271 | c = add_com ("taas", class_run, taas_command, _("\ |
| 2272 | Apply a command to all threads (ignoring errors and empty output).\n\ |
| 2273 | Usage: taas [OPTION]... COMMAND\n\ |
| 2274 | shortcut for 'thread apply all -s [OPTION]... COMMAND'\n\ |
| 2275 | See \"help thread apply all\" for available options.")); |
| 2276 | set_cmd_completer_handle_brkchars (c, thread_apply_all_command_completer); |
| 2277 | |
| 2278 | c = add_com ("tfaas", class_run, tfaas_command, _("\ |
| 2279 | Apply a command to all frames of all threads (ignoring errors and empty output).\n\ |
| 2280 | Usage: tfaas [OPTION]... COMMAND\n\ |
| 2281 | shortcut for 'thread apply all -s -- frame apply all -s [OPTION]... COMMAND'\n\ |
| 2282 | See \"help frame apply all\" for available options.")); |
| 2283 | set_cmd_completer_handle_brkchars (c, frame_apply_all_cmd_completer); |
| 2284 | |
| 2285 | add_cmd ("name", class_run, thread_name_command, |
| 2286 | _("Set the current thread's name.\n\ |
| 2287 | Usage: thread name [NAME]\n\ |
| 2288 | If NAME is not given, then any existing name is removed."), &thread_cmd_list); |
| 2289 | |
| 2290 | add_cmd ("find", class_run, thread_find_command, _("\ |
| 2291 | Find threads that match a regular expression.\n\ |
| 2292 | Usage: thread find REGEXP\n\ |
| 2293 | Will display thread ids whose name, target ID, or extra info matches REGEXP."), |
| 2294 | &thread_cmd_list); |
| 2295 | |
| 2296 | add_com_alias ("t", "thread", class_run, 1); |
| 2297 | |
| 2298 | add_setshow_boolean_cmd ("thread-events", no_class, |
| 2299 | &print_thread_events, _("\ |
| 2300 | Set printing of thread events (such as thread start and exit)."), _("\ |
| 2301 | Show printing of thread events (such as thread start and exit)."), NULL, |
| 2302 | NULL, |
| 2303 | show_print_thread_events, |
| 2304 | &setprintlist, &showprintlist); |
| 2305 | |
| 2306 | create_internalvar_type_lazy ("_thread", &thread_funcs, NULL); |
| 2307 | create_internalvar_type_lazy ("_gthread", >hread_funcs, NULL); |
| 2308 | } |