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c906108c | 1 | /* Multi-process/thread control defs for GDB, the GNU debugger. |
e2882c85 | 2 | Copyright (C) 1987-2018 Free Software Foundation, Inc. |
b6ba6518 KB |
3 | Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA. |
4 | ||
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #ifndef GDBTHREAD_H | |
22 | #define GDBTHREAD_H | |
23 | ||
da3331ec AC |
24 | struct symtab; |
25 | ||
c906108c | 26 | #include "breakpoint.h" |
aa0cd9c1 | 27 | #include "frame.h" |
8e8901c5 | 28 | #include "ui-out.h" |
a474d7c2 | 29 | #include "inferior.h" |
02d27625 | 30 | #include "btrace.h" |
6c659fc2 | 31 | #include "common/vec.h" |
372316f1 | 32 | #include "target/waitstatus.h" |
5d5658a1 | 33 | #include "cli/cli-utils.h" |
3a3fd0fd | 34 | #include "common/refcounted-object.h" |
043a4934 | 35 | #include "common-gdbthread.h" |
8e8901c5 | 36 | |
30596231 PA |
37 | /* Frontend view of the thread state. Possible extensions: stepping, |
38 | finishing, until(ling),... */ | |
39 | enum thread_state | |
40 | { | |
41 | THREAD_STOPPED, | |
42 | THREAD_RUNNING, | |
43 | THREAD_EXITED, | |
44 | }; | |
45 | ||
16c381f0 | 46 | /* Inferior thread specific part of `struct infcall_control_state'. |
8ea051c5 | 47 | |
16c381f0 | 48 | Inferior process counterpart is `struct inferior_control_state'. */ |
8ea051c5 | 49 | |
16c381f0 JK |
50 | struct thread_control_state |
51 | { | |
4e1c45ea PA |
52 | /* User/external stepping state. */ |
53 | ||
8358c15c JK |
54 | /* Step-resume or longjmp-resume breakpoint. */ |
55 | struct breakpoint *step_resume_breakpoint; | |
56 | ||
186c406b TT |
57 | /* Exception-resume breakpoint. */ |
58 | struct breakpoint *exception_resume_breakpoint; | |
59 | ||
34b7e8a6 PA |
60 | /* Breakpoints used for software single stepping. Plural, because |
61 | it may have multiple locations. E.g., if stepping over a | |
62 | conditional branch instruction we can't decode the condition for, | |
63 | we'll need to put a breakpoint at the branch destination, and | |
64 | another at the instruction after the branch. */ | |
65 | struct breakpoint *single_step_breakpoints; | |
66 | ||
4e1c45ea PA |
67 | /* Range to single step within. |
68 | ||
69 | If this is nonzero, respond to a single-step signal by continuing | |
70 | to step if the pc is in this range. | |
71 | ||
72 | If step_range_start and step_range_end are both 1, it means to | |
73 | step for a single instruction (FIXME: it might clean up | |
74 | wait_for_inferior in a minor way if this were changed to the | |
75 | address of the instruction and that address plus one. But maybe | |
0963b4bd | 76 | not). */ |
4e1c45ea PA |
77 | CORE_ADDR step_range_start; /* Inclusive */ |
78 | CORE_ADDR step_range_end; /* Exclusive */ | |
79 | ||
885eeb5b PA |
80 | /* Function the thread was in as of last it started stepping. */ |
81 | struct symbol *step_start_function; | |
82 | ||
c1e36e3e PA |
83 | /* If GDB issues a target step request, and this is nonzero, the |
84 | target should single-step this thread once, and then continue | |
85 | single-stepping it without GDB core involvement as long as the | |
86 | thread stops in the step range above. If this is zero, the | |
87 | target should ignore the step range, and only issue one single | |
88 | step. */ | |
89 | int may_range_step; | |
90 | ||
4e1c45ea PA |
91 | /* Stack frame address as of when stepping command was issued. |
92 | This is how we know when we step into a subroutine call, and how | |
93 | to set the frame for the breakpoint used to step out. */ | |
aa0cd9c1 | 94 | struct frame_id step_frame_id; |
edb3359d DJ |
95 | |
96 | /* Similarly, the frame ID of the underlying stack frame (skipping | |
97 | any inlined frames). */ | |
98 | struct frame_id step_stack_frame_id; | |
99 | ||
4e1c45ea PA |
100 | /* Nonzero if we are presently stepping over a breakpoint. |
101 | ||
102 | If we hit a breakpoint or watchpoint, and then continue, we need | |
103 | to single step the current thread with breakpoints disabled, to | |
104 | avoid hitting the same breakpoint or watchpoint again. And we | |
105 | should step just a single thread and keep other threads stopped, | |
106 | so that other threads don't miss breakpoints while they are | |
107 | removed. | |
108 | ||
109 | So, this variable simultaneously means that we need to single | |
110 | step the current thread, keep other threads stopped, and that | |
111 | breakpoints should be removed while we step. | |
112 | ||
113 | This variable is set either: | |
114 | - in proceed, when we resume inferior on user's explicit request | |
115 | - in keep_going, if handle_inferior_event decides we need to | |
116 | step over breakpoint. | |
117 | ||
118 | The variable is cleared in normal_stop. The proceed calls | |
119 | wait_for_inferior, which calls handle_inferior_event in a loop, | |
120 | and until wait_for_inferior exits, this variable is changed only | |
121 | by keep_going. */ | |
0d06e24b | 122 | int trap_expected; |
4e1c45ea | 123 | |
16c381f0 | 124 | /* Nonzero if the thread is being proceeded for a "finish" command |
46c03469 | 125 | or a similar situation when return value should be printed. */ |
16c381f0 JK |
126 | int proceed_to_finish; |
127 | ||
128 | /* Nonzero if the thread is being proceeded for an inferior function | |
129 | call. */ | |
130 | int in_infcall; | |
131 | ||
132 | enum step_over_calls_kind step_over_calls; | |
133 | ||
134 | /* Nonzero if stopped due to a step command. */ | |
135 | int stop_step; | |
136 | ||
137 | /* Chain containing status of breakpoint(s) the thread stopped | |
138 | at. */ | |
139 | bpstat stop_bpstat; | |
17b2616c | 140 | |
856e7dd6 PA |
141 | /* Whether the command that started the thread was a stepping |
142 | command. This is used to decide whether "set scheduler-locking | |
143 | step" behaves like "on" or "off". */ | |
144 | int stepping_command; | |
16c381f0 JK |
145 | }; |
146 | ||
a38fe4fe | 147 | /* Inferior thread specific part of `struct infcall_suspend_state'. */ |
16c381f0 JK |
148 | |
149 | struct thread_suspend_state | |
150 | { | |
70509625 PA |
151 | /* Last signal that the inferior received (why it stopped). When |
152 | the thread is resumed, this signal is delivered. Note: the | |
153 | target should not check whether the signal is in pass state, | |
154 | because the signal may have been explicitly passed with the | |
155 | "signal" command, which overrides "handle nopass". If the signal | |
156 | should be suppressed, the core will take care of clearing this | |
157 | before the target is resumed. */ | |
2ea28649 | 158 | enum gdb_signal stop_signal; |
372316f1 PA |
159 | |
160 | /* The reason the thread last stopped, if we need to track it | |
161 | (breakpoint, watchpoint, etc.) */ | |
162 | enum target_stop_reason stop_reason; | |
163 | ||
164 | /* The waitstatus for this thread's last event. */ | |
165 | struct target_waitstatus waitstatus; | |
166 | /* If true WAITSTATUS hasn't been handled yet. */ | |
167 | int waitstatus_pending_p; | |
168 | ||
169 | /* Record the pc of the thread the last time it stopped. (This is | |
170 | not the current thread's PC as that may have changed since the | |
171 | last stop, e.g., "return" command, or "p $pc = 0xf000"). This is | |
172 | used in coordination with stop_reason and waitstatus_pending_p: | |
173 | if the thread's PC is changed since it last stopped, a pending | |
174 | breakpoint waitstatus is discarded. */ | |
175 | CORE_ADDR stop_pc; | |
16c381f0 JK |
176 | }; |
177 | ||
7aabaf9d SM |
178 | /* Base class for target-specific thread data. */ |
179 | struct private_thread_info | |
180 | { | |
181 | virtual ~private_thread_info () = 0; | |
182 | }; | |
183 | ||
3a3fd0fd PA |
184 | /* Threads are intrusively refcounted objects. Being the |
185 | user-selected thread is normally considered an implicit strong | |
186 | reference and is thus not accounted in the refcount, unlike | |
187 | inferior objects. This is necessary, because there's no "current | |
188 | thread" pointer. Instead the current thread is inferred from the | |
189 | inferior_ptid global. However, when GDB needs to remember the | |
190 | selected thread to later restore it, GDB bumps the thread object's | |
191 | refcount, to prevent something deleting the thread object before | |
a6c21d4a | 192 | reverting back (e.g., due to a "kill" command). If the thread |
3a3fd0fd PA |
193 | meanwhile exits before being re-selected, then the thread object is |
194 | left listed in the thread list, but marked with state | |
195 | THREAD_EXITED. (See make_cleanup_restore_current_thread and | |
196 | delete_thread). All other thread references are considered weak | |
197 | references. Placing a thread in the thread list is an implicit | |
198 | strong reference, and is thus not accounted for in the thread's | |
199 | refcount. */ | |
200 | ||
201 | class thread_info : public refcounted_object | |
16c381f0 | 202 | { |
12316564 YQ |
203 | public: |
204 | explicit thread_info (inferior *inf, ptid_t ptid); | |
205 | ~thread_info (); | |
206 | ||
803bdfe4 YQ |
207 | bool deletable () const |
208 | { | |
209 | /* If this is the current thread, or there's code out there that | |
3a3fd0fd PA |
210 | relies on it existing (refcount > 0) we can't delete yet. */ |
211 | return (refcount () == 0 && !ptid_equal (ptid, inferior_ptid)); | |
803bdfe4 YQ |
212 | } |
213 | ||
00431a78 PA |
214 | /* Mark this thread as running and notify observers. */ |
215 | void set_running (bool running); | |
216 | ||
12316564 | 217 | struct thread_info *next = NULL; |
16c381f0 JK |
218 | ptid_t ptid; /* "Actual process id"; |
219 | In fact, this may be overloaded with | |
220 | kernel thread id, etc. */ | |
5d5658a1 PA |
221 | |
222 | /* Each thread has two GDB IDs. | |
223 | ||
224 | a) The thread ID (Id). This consists of the pair of: | |
225 | ||
226 | - the number of the thread's inferior and, | |
227 | ||
228 | - the thread's thread number in its inferior, aka, the | |
229 | per-inferior thread number. This number is unique in the | |
230 | inferior but not unique between inferiors. | |
231 | ||
232 | b) The global ID (GId). This is a a single integer unique | |
233 | between all inferiors. | |
234 | ||
235 | E.g.: | |
236 | ||
237 | (gdb) info threads -gid | |
238 | Id GId Target Id Frame | |
239 | * 1.1 1 Thread A 0x16a09237 in foo () at foo.c:10 | |
240 | 1.2 3 Thread B 0x15ebc6ed in bar () at foo.c:20 | |
241 | 1.3 5 Thread C 0x15ebc6ed in bar () at foo.c:20 | |
242 | 2.1 2 Thread A 0x16a09237 in foo () at foo.c:10 | |
243 | 2.2 4 Thread B 0x15ebc6ed in bar () at foo.c:20 | |
244 | 2.3 6 Thread C 0x15ebc6ed in bar () at foo.c:20 | |
245 | ||
246 | Above, both inferiors 1 and 2 have threads numbered 1-3, but each | |
247 | thread has its own unique global ID. */ | |
248 | ||
c84f6bbf | 249 | /* The thread's global GDB thread number. This is exposed to MI, |
663f6d42 PA |
250 | Python/Scheme, visible with "info threads -gid", and is also what |
251 | the $_gthread convenience variable is bound to. */ | |
5d5658a1 PA |
252 | int global_num; |
253 | ||
254 | /* The per-inferior thread number. This is unique in the inferior | |
255 | the thread belongs to, but not unique between inferiors. This is | |
256 | what the $_thread convenience variable is bound to. */ | |
257 | int per_inf_num; | |
258 | ||
259 | /* The inferior this thread belongs to. */ | |
260 | struct inferior *inf; | |
16c381f0 | 261 | |
4694da01 TT |
262 | /* The name of the thread, as specified by the user. This is NULL |
263 | if the thread does not have a user-given name. */ | |
12316564 | 264 | char *name = NULL; |
4694da01 | 265 | |
16c381f0 JK |
266 | /* Non-zero means the thread is executing. Note: this is different |
267 | from saying that there is an active target and we are stopped at | |
268 | a breakpoint, for instance. This is a real indicator whether the | |
269 | thread is off and running. */ | |
12316564 | 270 | int executing = 0; |
16c381f0 | 271 | |
372316f1 PA |
272 | /* Non-zero if this thread is resumed from infrun's perspective. |
273 | Note that a thread can be marked both as not-executing and | |
274 | resumed at the same time. This happens if we try to resume a | |
275 | thread that has a wait status pending. We shouldn't let the | |
276 | thread really run until that wait status has been processed, but | |
277 | we should not process that wait status if we didn't try to let | |
278 | the thread run. */ | |
12316564 | 279 | int resumed = 0; |
372316f1 | 280 | |
f6e29b6e YQ |
281 | /* Frontend view of the thread state. Note that the THREAD_RUNNING/ |
282 | THREAD_STOPPED states are different from EXECUTING. When the | |
283 | thread is stopped internally while handling an internal event, | |
284 | like a software single-step breakpoint, EXECUTING will be false, | |
285 | but STATE will still be THREAD_RUNNING. */ | |
12316564 | 286 | enum thread_state state = THREAD_STOPPED; |
16c381f0 | 287 | |
16c381f0 JK |
288 | /* State of GDB control of inferior thread execution. |
289 | See `struct thread_control_state'. */ | |
12316564 | 290 | thread_control_state control {}; |
16c381f0 JK |
291 | |
292 | /* State of inferior thread to restore after GDB is done with an inferior | |
293 | call. See `struct thread_suspend_state'. */ | |
12316564 | 294 | thread_suspend_state suspend {}; |
16c381f0 | 295 | |
12316564 YQ |
296 | int current_line = 0; |
297 | struct symtab *current_symtab = NULL; | |
16c381f0 JK |
298 | |
299 | /* Internal stepping state. */ | |
300 | ||
4d9d9d04 PA |
301 | /* Record the pc of the thread the last time it was resumed. (It |
302 | can't be done on stop as the PC may change since the last stop, | |
303 | e.g., "return" command, or "p $pc = 0xf000"). This is maintained | |
304 | by proceed and keep_going, and among other things, it's used in | |
16c381f0 JK |
305 | adjust_pc_after_break to distinguish a hardware single-step |
306 | SIGTRAP from a breakpoint SIGTRAP. */ | |
12316564 | 307 | CORE_ADDR prev_pc = 0; |
16c381f0 | 308 | |
7f5ef605 PA |
309 | /* Did we set the thread stepping a breakpoint instruction? This is |
310 | used in conjunction with PREV_PC to decide whether to adjust the | |
311 | PC. */ | |
12316564 | 312 | int stepped_breakpoint = 0; |
7f5ef605 | 313 | |
4e1c45ea | 314 | /* Should we step over breakpoint next time keep_going is called? */ |
12316564 | 315 | int stepping_over_breakpoint = 0; |
0d06e24b | 316 | |
963f9c80 PA |
317 | /* Should we step over a watchpoint next time keep_going is called? |
318 | This is needed on targets with non-continuable, non-steppable | |
319 | watchpoints. */ | |
12316564 | 320 | int stepping_over_watchpoint = 0; |
963f9c80 | 321 | |
4e1c45ea | 322 | /* Set to TRUE if we should finish single-stepping over a breakpoint |
6aa27652 YQ |
323 | after hitting the current step-resume breakpoint. The context here |
324 | is that GDB is to do `next' or `step' while signal arrives. | |
325 | When stepping over a breakpoint and signal arrives, GDB will attempt | |
326 | to skip signal handler, so it inserts a step_resume_breakpoint at the | |
327 | signal return address, and resume inferior. | |
328 | step_after_step_resume_breakpoint is set to TRUE at this moment in | |
329 | order to keep GDB in mind that there is still a breakpoint to step over | |
330 | when GDB gets back SIGTRAP from step_resume_breakpoint. */ | |
12316564 | 331 | int step_after_step_resume_breakpoint = 0; |
4e1c45ea | 332 | |
243a9253 PA |
333 | /* Pointer to the state machine manager object that handles what is |
334 | left to do for the thread's execution command after the target | |
335 | stops. Several execution commands use it. */ | |
12316564 | 336 | struct thread_fsm *thread_fsm = NULL; |
a474d7c2 | 337 | |
e58b0e63 PA |
338 | /* This is used to remember when a fork or vfork event was caught by |
339 | a catchpoint, and thus the event is to be followed at the next | |
340 | resume of the thread, and not immediately. */ | |
341 | struct target_waitstatus pending_follow; | |
342 | ||
252fbfc8 | 343 | /* True if this thread has been explicitly requested to stop. */ |
12316564 | 344 | int stop_requested = 0; |
252fbfc8 | 345 | |
186c406b | 346 | /* The initiating frame of a nexting operation, used for deciding |
e2e4d78b JK |
347 | which exceptions to intercept. If it is null_frame_id no |
348 | bp_longjmp or bp_exception but longjmp has been caught just for | |
349 | bp_longjmp_call_dummy. */ | |
12316564 | 350 | struct frame_id initiating_frame = null_frame_id; |
186c406b | 351 | |
0d06e24b | 352 | /* Private data used by the target vector implementation. */ |
7aabaf9d | 353 | std::unique_ptr<private_thread_info> priv; |
02d27625 MM |
354 | |
355 | /* Branch trace information for this thread. */ | |
12316564 | 356 | struct btrace_thread_info btrace {}; |
6c659fc2 SC |
357 | |
358 | /* Flag which indicates that the stack temporaries should be stored while | |
359 | evaluating expressions. */ | |
fdf07f3a | 360 | bool stack_temporaries_enabled = false; |
6c659fc2 SC |
361 | |
362 | /* Values that are stored as temporaries on stack while evaluating | |
363 | expressions. */ | |
fdf07f3a | 364 | std::vector<struct value *> stack_temporaries; |
c2829269 PA |
365 | |
366 | /* Step-over chain. A thread is in the step-over queue if these are | |
367 | non-NULL. If only a single thread is in the chain, then these | |
368 | fields point to self. */ | |
12316564 YQ |
369 | struct thread_info *step_over_prev = NULL; |
370 | struct thread_info *step_over_next = NULL; | |
0d06e24b JM |
371 | }; |
372 | ||
00431a78 PA |
373 | /* A gdb::ref_ptr pointer to a thread_info. */ |
374 | ||
375 | using thread_info_ref | |
376 | = gdb::ref_ptr<thread_info, refcounted_object_ref_policy>; | |
377 | ||
0d06e24b JM |
378 | /* Create an empty thread list, or empty the existing one. */ |
379 | extern void init_thread_list (void); | |
380 | ||
93815fbf VP |
381 | /* Add a thread to the thread list, print a message |
382 | that a new thread is found, and return the pointer to | |
383 | the new thread. Caller my use this pointer to | |
384 | initialize the private thread data. */ | |
39f77062 | 385 | extern struct thread_info *add_thread (ptid_t ptid); |
0d06e24b | 386 | |
93815fbf VP |
387 | /* Same as add_thread, but does not print a message |
388 | about new thread. */ | |
389 | extern struct thread_info *add_thread_silent (ptid_t ptid); | |
390 | ||
17faa917 DJ |
391 | /* Same as add_thread, and sets the private info. */ |
392 | extern struct thread_info *add_thread_with_info (ptid_t ptid, | |
393 | struct private_thread_info *); | |
394 | ||
0d06e24b | 395 | /* Delete an existing thread list entry. */ |
00431a78 | 396 | extern void delete_thread (thread_info *thread); |
0d06e24b | 397 | |
5e0b29c1 PA |
398 | /* Delete an existing thread list entry, and be quiet about it. Used |
399 | after the process this thread having belonged to having already | |
400 | exited, for example. */ | |
00431a78 | 401 | extern void delete_thread_silent (thread_info *thread); |
5e0b29c1 | 402 | |
0963b4bd | 403 | /* Delete a step_resume_breakpoint from the thread database. */ |
4e1c45ea | 404 | extern void delete_step_resume_breakpoint (struct thread_info *); |
8601f500 | 405 | |
0963b4bd | 406 | /* Delete an exception_resume_breakpoint from the thread database. */ |
186c406b TT |
407 | extern void delete_exception_resume_breakpoint (struct thread_info *); |
408 | ||
34b7e8a6 PA |
409 | /* Delete the single-step breakpoints of thread TP, if any. */ |
410 | extern void delete_single_step_breakpoints (struct thread_info *tp); | |
411 | ||
412 | /* Check if the thread has software single stepping breakpoints | |
413 | set. */ | |
414 | extern int thread_has_single_step_breakpoints_set (struct thread_info *tp); | |
415 | ||
416 | /* Check whether the thread has software single stepping breakpoints | |
417 | set at PC. */ | |
418 | extern int thread_has_single_step_breakpoint_here (struct thread_info *tp, | |
accd0bcd | 419 | const address_space *aspace, |
34b7e8a6 PA |
420 | CORE_ADDR addr); |
421 | ||
5d5658a1 PA |
422 | /* Returns whether to show inferior-qualified thread IDs, or plain |
423 | thread numbers. Inferior-qualified IDs are shown whenever we have | |
424 | multiple inferiors, or the only inferior left has number > 1. */ | |
425 | extern int show_inferior_qualified_tids (void); | |
0d06e24b | 426 | |
5d5658a1 PA |
427 | /* Return a string version of THR's thread ID. If there are multiple |
428 | inferiors, then this prints the inferior-qualifier form, otherwise | |
429 | it only prints the thread number. The result is stored in a | |
430 | circular static buffer, NUMCELLS deep. */ | |
43792cf0 PA |
431 | const char *print_thread_id (struct thread_info *thr); |
432 | ||
00431a78 | 433 | /* Boolean test for an already-known ptid. */ |
39f77062 | 434 | extern int in_thread_list (ptid_t ptid); |
0d06e24b | 435 | |
5d5658a1 PA |
436 | /* Boolean test for an already-known global thread id (GDB's homegrown |
437 | global id, not the system's). */ | |
438 | extern int valid_global_thread_id (int global_id); | |
0d06e24b JM |
439 | |
440 | /* Search function to lookup a thread by 'pid'. */ | |
e09875d4 | 441 | extern struct thread_info *find_thread_ptid (ptid_t ptid); |
0d06e24b | 442 | |
5d5658a1 PA |
443 | /* Find thread by GDB global thread ID. */ |
444 | struct thread_info *find_thread_global_id (int global_id); | |
1e92afda | 445 | |
e04ee09e KB |
446 | /* Find thread by thread library specific handle in inferior INF. */ |
447 | struct thread_info *find_thread_by_handle (struct value *thread_handle, | |
448 | struct inferior *inf); | |
449 | ||
00431a78 PA |
450 | /* Finds the first thread of the specified inferior. */ |
451 | extern thread_info *first_thread_of_inferior (inferior *inf); | |
bad34192 | 452 | |
00431a78 PA |
453 | /* Returns any thread of inferior INF, giving preference to the |
454 | current thread. */ | |
455 | extern thread_info *any_thread_of_inferior (inferior *inf); | |
2277426b | 456 | |
00431a78 | 457 | /* Returns any non-exited thread of inferior INF, giving preference to |
32990ada | 458 | the current thread, and to not executing threads. */ |
00431a78 | 459 | extern thread_info *any_live_thread_of_inferior (inferior *inf); |
6c95b8df | 460 | |
5231c1fd PA |
461 | /* Change the ptid of thread OLD_PTID to NEW_PTID. */ |
462 | void thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid); | |
463 | ||
0d06e24b JM |
464 | /* Iterator function to call a user-provided callback function |
465 | once for each known thread. */ | |
466 | typedef int (*thread_callback_func) (struct thread_info *, void *); | |
467 | extern struct thread_info *iterate_over_threads (thread_callback_func, void *); | |
468 | ||
5d5658a1 PA |
469 | /* Traverse all threads. */ |
470 | #define ALL_THREADS(T) \ | |
471 | for (T = thread_list; T; T = T->next) \ | |
472 | ||
473 | /* Traverse over all threads, sorted by inferior. */ | |
474 | #define ALL_THREADS_BY_INFERIOR(inf, tp) \ | |
475 | ALL_INFERIORS (inf) \ | |
476 | ALL_THREADS (tp) \ | |
477 | if (inf == tp->inf) | |
478 | ||
034f788c PA |
479 | /* Traverse all threads, except those that have THREAD_EXITED |
480 | state. */ | |
e5ef252a | 481 | |
034f788c PA |
482 | #define ALL_NON_EXITED_THREADS(T) \ |
483 | for (T = thread_list; T; T = T->next) \ | |
484 | if ((T)->state != THREAD_EXITED) | |
e5ef252a | 485 | |
8a06aea7 PA |
486 | /* Traverse all threads, including those that have THREAD_EXITED |
487 | state. Allows deleting the currently iterated thread. */ | |
488 | #define ALL_THREADS_SAFE(T, TMP) \ | |
ab970af1 PA |
489 | for ((T) = thread_list; \ |
490 | (T) != NULL ? ((TMP) = (T)->next, 1): 0; \ | |
8a06aea7 | 491 | (T) = (TMP)) |
ab970af1 | 492 | |
20874c92 VP |
493 | extern int thread_count (void); |
494 | ||
00431a78 PA |
495 | /* Switch context to thread THR. Also sets the STOP_PC global. */ |
496 | extern void switch_to_thread (thread_info *thr); | |
497 | ||
498 | /* Switch context to no thread selected. */ | |
499 | extern void switch_to_no_thread (); | |
500 | ||
6efcd9a8 PA |
501 | /* Switch from one thread to another. Does not read registers and |
502 | sets STOP_PC to -1. */ | |
503 | extern void switch_to_thread_no_regs (struct thread_info *thread); | |
504 | ||
372316f1 PA |
505 | /* Marks or clears thread(s) PTID as resumed. If PTID is |
506 | MINUS_ONE_PTID, applies to all threads. If ptid_is_pid(PTID) is | |
507 | true, applies to all threads of the process pointed at by PTID. */ | |
508 | extern void set_resumed (ptid_t ptid, int resumed); | |
509 | ||
e1ac3328 | 510 | /* Marks thread PTID is running, or stopped. |
28153fd3 | 511 | If PTID is minus_one_ptid, marks all threads. */ |
e1ac3328 VP |
512 | extern void set_running (ptid_t ptid, int running); |
513 | ||
252fbfc8 PA |
514 | /* Marks or clears thread(s) PTID as having been requested to stop. |
515 | If PTID is MINUS_ONE_PTID, applies to all threads. If | |
516 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
517 | pointed at by PTID. If STOP, then the THREAD_STOP_REQUESTED | |
518 | observer is called with PTID as argument. */ | |
519 | extern void set_stop_requested (ptid_t ptid, int stop); | |
520 | ||
0d6431e2 PA |
521 | /* NOTE: Since the thread state is not a boolean, most times, you do |
522 | not want to check it with negation. If you really want to check if | |
523 | the thread is stopped, | |
e1ac3328 | 524 | |
0d6431e2 PA |
525 | use (good): |
526 | ||
527 | if (is_stopped (ptid)) | |
528 | ||
529 | instead of (bad): | |
530 | ||
531 | if (!is_running (ptid)) | |
532 | ||
533 | The latter also returns true on exited threads, most likelly not | |
534 | what you want. */ | |
535 | ||
536 | /* Reports if in the frontend's perpective, thread PTID is running. */ | |
537 | extern int is_running (ptid_t ptid); | |
8ea051c5 | 538 | |
4f8d22e3 PA |
539 | /* Is this thread listed, but known to have exited? We keep it listed |
540 | (but not visible) until it's safe to delete. */ | |
541 | extern int is_exited (ptid_t ptid); | |
542 | ||
0d6431e2 | 543 | /* In the frontend's perpective, is this thread stopped? */ |
4f8d22e3 PA |
544 | extern int is_stopped (ptid_t ptid); |
545 | ||
28153fd3 | 546 | /* Marks thread PTID as executing, or not. If PTID is minus_one_ptid, |
0d6431e2 PA |
547 | marks all threads. |
548 | ||
549 | Note that this is different from the running state. See the | |
30596231 | 550 | description of state and executing fields of struct |
0d6431e2 | 551 | thread_info. */ |
8ea051c5 PA |
552 | extern void set_executing (ptid_t ptid, int executing); |
553 | ||
b57bacec PA |
554 | /* True if any (known or unknown) thread is or may be executing. */ |
555 | extern int threads_are_executing (void); | |
556 | ||
29f49a6a PA |
557 | /* Merge the executing property of thread PTID over to its thread |
558 | state property (frontend running/stopped view). | |
559 | ||
560 | "not executing" -> "stopped" | |
561 | "executing" -> "running" | |
562 | "exited" -> "exited" | |
563 | ||
28153fd3 | 564 | If PTID is minus_one_ptid, go over all threads. |
29f49a6a PA |
565 | |
566 | Notifications are only emitted if the thread state did change. */ | |
567 | extern void finish_thread_state (ptid_t ptid); | |
568 | ||
731f534f PA |
569 | /* Calls finish_thread_state on scope exit, unless release() is called |
570 | to disengage. */ | |
571 | class scoped_finish_thread_state | |
572 | { | |
573 | public: | |
574 | explicit scoped_finish_thread_state (ptid_t ptid) | |
575 | : m_ptid (ptid) | |
576 | {} | |
577 | ||
578 | ~scoped_finish_thread_state () | |
579 | { | |
580 | if (!m_released) | |
581 | finish_thread_state (m_ptid); | |
582 | } | |
583 | ||
584 | /* Disengage. */ | |
585 | void release () | |
586 | { | |
587 | m_released = true; | |
588 | } | |
589 | ||
590 | DISABLE_COPY_AND_ASSIGN (scoped_finish_thread_state); | |
591 | ||
592 | private: | |
593 | bool m_released = false; | |
594 | ptid_t m_ptid; | |
595 | }; | |
29f49a6a | 596 | |
c906108c SS |
597 | /* Commands with a prefix of `thread'. */ |
598 | extern struct cmd_list_element *thread_cmd_list; | |
599 | ||
981a3fb3 | 600 | extern void thread_command (const char *tidstr, int from_tty); |
f0e8c4c5 | 601 | |
93815fbf VP |
602 | /* Print notices on thread events (attach, detach, etc.), set with |
603 | `set print thread-events'. */ | |
604 | extern int print_thread_events; | |
605 | ||
5d5658a1 PA |
606 | /* Prints the list of threads and their details on UIOUT. If |
607 | REQUESTED_THREADS, a list of GDB ids/ranges, is not NULL, only | |
608 | print threads whose ID is included in the list. If PID is not -1, | |
609 | only print threads from the process PID. Otherwise, threads from | |
610 | all attached PIDs are printed. If both REQUESTED_THREADS is not | |
611 | NULL and PID is not -1, then the thread is printed if it belongs to | |
612 | the specified process. Otherwise, an error is raised. */ | |
613 | extern void print_thread_info (struct ui_out *uiout, char *requested_threads, | |
3ee1c036 | 614 | int pid); |
8e8901c5 | 615 | |
5ed8105e PA |
616 | /* Save/restore current inferior/thread/frame. */ |
617 | ||
618 | class scoped_restore_current_thread | |
619 | { | |
620 | public: | |
621 | scoped_restore_current_thread (); | |
622 | ~scoped_restore_current_thread (); | |
623 | ||
d6541620 | 624 | DISABLE_COPY_AND_ASSIGN (scoped_restore_current_thread); |
5ed8105e PA |
625 | |
626 | private: | |
7aabaf9d SM |
627 | /* Use the "class" keyword here, because of a clash with a "thread_info" |
628 | function in the Darwin API. */ | |
629 | class thread_info *m_thread; | |
5ed8105e PA |
630 | inferior *m_inf; |
631 | frame_id m_selected_frame_id; | |
632 | int m_selected_frame_level; | |
633 | bool m_was_stopped; | |
634 | }; | |
6208b47d | 635 | |
4e1c45ea PA |
636 | /* Returns a pointer into the thread_info corresponding to |
637 | INFERIOR_PTID. INFERIOR_PTID *must* be in the thread list. */ | |
638 | extern struct thread_info* inferior_thread (void); | |
6208b47d | 639 | |
dc146f7c VP |
640 | extern void update_thread_list (void); |
641 | ||
e8032dde PA |
642 | /* Delete any thread the target says is no longer alive. */ |
643 | ||
644 | extern void prune_threads (void); | |
645 | ||
8a06aea7 PA |
646 | /* Delete threads marked THREAD_EXITED. Unlike prune_threads, this |
647 | does not consult the target about whether the thread is alive right | |
648 | now. */ | |
649 | extern void delete_exited_threads (void); | |
650 | ||
ce4c476a PA |
651 | /* Return true if PC is in the stepping range of THREAD. */ |
652 | ||
653 | int pc_in_thread_step_range (CORE_ADDR pc, struct thread_info *thread); | |
654 | ||
00431a78 PA |
655 | /* Enable storing stack temporaries for thread THR and disable and |
656 | clear the stack temporaries on destruction. Holds a strong | |
657 | reference to THR. */ | |
fdf07f3a TT |
658 | |
659 | class enable_thread_stack_temporaries | |
660 | { | |
661 | public: | |
662 | ||
00431a78 PA |
663 | explicit enable_thread_stack_temporaries (thread_info *thr) |
664 | : m_thr (thr) | |
fdf07f3a | 665 | { |
00431a78 | 666 | gdb_assert (m_thr != NULL); |
fdf07f3a | 667 | |
00431a78 PA |
668 | m_thr->incref (); |
669 | ||
670 | m_thr->stack_temporaries_enabled = true; | |
671 | m_thr->stack_temporaries.clear (); | |
fdf07f3a TT |
672 | } |
673 | ||
674 | ~enable_thread_stack_temporaries () | |
675 | { | |
00431a78 PA |
676 | m_thr->stack_temporaries_enabled = false; |
677 | m_thr->stack_temporaries.clear (); | |
fdf07f3a | 678 | |
00431a78 | 679 | m_thr->decref (); |
fdf07f3a TT |
680 | } |
681 | ||
682 | DISABLE_COPY_AND_ASSIGN (enable_thread_stack_temporaries); | |
683 | ||
684 | private: | |
685 | ||
00431a78 | 686 | thread_info *m_thr; |
fdf07f3a | 687 | }; |
6c659fc2 | 688 | |
00431a78 | 689 | extern bool thread_stack_temporaries_enabled_p (thread_info *tp); |
6c659fc2 | 690 | |
00431a78 | 691 | extern void push_thread_stack_temporary (thread_info *tp, struct value *v); |
6c659fc2 | 692 | |
00431a78 | 693 | extern value *get_last_thread_stack_temporary (thread_info *tp); |
6c659fc2 | 694 | |
00431a78 PA |
695 | extern bool value_in_thread_stack_temporaries (struct value *, |
696 | thread_info *thr); | |
6c659fc2 | 697 | |
c2829269 PA |
698 | /* Add TP to the end of its inferior's pending step-over chain. */ |
699 | ||
700 | extern void thread_step_over_chain_enqueue (struct thread_info *tp); | |
701 | ||
702 | /* Remove TP from its inferior's pending step-over chain. */ | |
703 | ||
704 | extern void thread_step_over_chain_remove (struct thread_info *tp); | |
705 | ||
706 | /* Return the next thread in the step-over chain starting at TP. NULL | |
707 | if TP is the last entry in the chain. */ | |
708 | ||
709 | extern struct thread_info *thread_step_over_chain_next (struct thread_info *tp); | |
710 | ||
711 | /* Return true if TP is in the step-over chain. */ | |
712 | ||
713 | extern int thread_is_in_step_over_chain (struct thread_info *tp); | |
714 | ||
243a9253 PA |
715 | /* Cancel any ongoing execution command. */ |
716 | ||
717 | extern void thread_cancel_execution_command (struct thread_info *thr); | |
718 | ||
a911d87a PA |
719 | /* Check whether it makes sense to access a register of the current |
720 | thread at this point. If not, throw an error (e.g., the thread is | |
721 | executing). */ | |
722 | extern void validate_registers_access (void); | |
723 | ||
00431a78 | 724 | /* Check whether it makes sense to access a register of THREAD at this point. |
cf77c34e | 725 | Returns true if registers may be accessed; false otherwise. */ |
00431a78 | 726 | extern bool can_access_registers_thread (thread_info *thread); |
cf77c34e | 727 | |
f303dbd6 PA |
728 | /* Returns whether to show which thread hit the breakpoint, received a |
729 | signal, etc. and ended up causing a user-visible stop. This is | |
730 | true iff we ever detected multiple threads. */ | |
731 | extern int show_thread_that_caused_stop (void); | |
732 | ||
4034d0ff AT |
733 | /* Print the message for a thread or/and frame selected. */ |
734 | extern void print_selected_thread_frame (struct ui_out *uiout, | |
735 | user_selected_what selection); | |
736 | ||
65630365 PA |
737 | /* Helper for the CLI's "thread" command and for MI's -thread-select. |
738 | Selects thread THR. TIDSTR is the original string the thread ID | |
739 | was parsed from. This is used in the error message if THR is not | |
740 | alive anymore. */ | |
7aabaf9d | 741 | extern void thread_select (const char *tidstr, class thread_info *thr); |
65630365 | 742 | |
e5ef252a PA |
743 | extern struct thread_info *thread_list; |
744 | ||
c5aa993b | 745 | #endif /* GDBTHREAD_H */ |