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/tmp/gdb-8.1/gdb/breakpoint.h
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1 /* Data structures associated with breakpoints in GDB.
2 Copyright (C) 1992-2018 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18
19 #if !defined (BREAKPOINT_H)
20 #define BREAKPOINT_H 1
21
22 #include "frame.h"
23 #include "value.h"
24 #include "vec.h"
25 #include "ax.h"
26 #include "command.h"
27 #include "break-common.h"
28 #include "probe.h"
29 #include "location.h"
30 #include <vector>
31 #include "common/array-view.h"
32 #include "cli/cli-script.h"
33
34 struct value;
35 struct block;
36 struct gdbpy_breakpoint_object;
37 struct gdbscm_breakpoint_object;
38 struct number_or_range_parser;
39 struct thread_info;
40 struct bpstats;
41 struct bp_location;
42 struct linespec_result;
43 struct linespec_sals;
44
45 /* Why are we removing the breakpoint from the target? */
46
47 enum remove_bp_reason
48 {
49 /* A regular remove. Remove the breakpoint and forget everything
50 about it. */
51 REMOVE_BREAKPOINT,
52
53 /* Detach the breakpoints from a fork child. */
54 DETACH_BREAKPOINT,
55 };
56
57 /* This is the maximum number of bytes a breakpoint instruction can
58 take. Feel free to increase it. It's just used in a few places to
59 size arrays that should be independent of the target
60 architecture. */
61
62 #define BREAKPOINT_MAX 16
63
64
65 /* Type of breakpoint. */
66
67 enum bptype
68 {
69 bp_none = 0, /* Eventpoint has been deleted */
70 bp_breakpoint, /* Normal breakpoint */
71 bp_hardware_breakpoint, /* Hardware assisted breakpoint */
72 bp_single_step, /* Software single-step */
73 bp_until, /* used by until command */
74 bp_finish, /* used by finish command */
75 bp_watchpoint, /* Watchpoint */
76 bp_hardware_watchpoint, /* Hardware assisted watchpoint */
77 bp_read_watchpoint, /* read watchpoint, (hardware assisted) */
78 bp_access_watchpoint, /* access watchpoint, (hardware assisted) */
79 bp_longjmp, /* secret breakpoint to find longjmp() */
80 bp_longjmp_resume, /* secret breakpoint to escape longjmp() */
81
82 /* Breakpoint placed to the same location(s) like bp_longjmp but used to
83 protect against stale DUMMY_FRAME. Multiple bp_longjmp_call_dummy and
84 one bp_call_dummy are chained together by related_breakpoint for each
85 DUMMY_FRAME. */
86 bp_longjmp_call_dummy,
87
88 /* An internal breakpoint that is installed on the unwinder's
89 debug hook. */
90 bp_exception,
91 /* An internal breakpoint that is set at the point where an
92 exception will land. */
93 bp_exception_resume,
94
95 /* Used by wait_for_inferior for stepping over subroutine calls,
96 and for skipping prologues. */
97 bp_step_resume,
98
99 /* Used by wait_for_inferior for stepping over signal
100 handlers. */
101 bp_hp_step_resume,
102
103 /* Used to detect when a watchpoint expression has gone out of
104 scope. These breakpoints are usually not visible to the user.
105
106 This breakpoint has some interesting properties:
107
108 1) There's always a 1:1 mapping between watchpoints
109 on local variables and watchpoint_scope breakpoints.
110
111 2) It automatically deletes itself and the watchpoint it's
112 associated with when hit.
113
114 3) It can never be disabled. */
115 bp_watchpoint_scope,
116
117 /* The breakpoint at the end of a call dummy. See bp_longjmp_call_dummy it
118 is chained with by related_breakpoint. */
119 bp_call_dummy,
120
121 /* A breakpoint set on std::terminate, that is used to catch
122 otherwise uncaught exceptions thrown during an inferior call. */
123 bp_std_terminate,
124
125 /* Some dynamic linkers (HP, maybe Solaris) can arrange for special
126 code in the inferior to run when significant events occur in the
127 dynamic linker (for example a library is loaded or unloaded).
128
129 By placing a breakpoint in this magic code GDB will get control
130 when these significant events occur. GDB can then re-examine
131 the dynamic linker's data structures to discover any newly loaded
132 dynamic libraries. */
133 bp_shlib_event,
134
135 /* Some multi-threaded systems can arrange for a location in the
136 inferior to be executed when certain thread-related events occur
137 (such as thread creation or thread death).
138
139 By placing a breakpoint at one of these locations, GDB will get
140 control when these events occur. GDB can then update its thread
141 lists etc. */
142
143 bp_thread_event,
144
145 /* On the same principal, an overlay manager can arrange to call a
146 magic location in the inferior whenever there is an interesting
147 change in overlay status. GDB can update its overlay tables
148 and fiddle with breakpoints in overlays when this breakpoint
149 is hit. */
150
151 bp_overlay_event,
152
153 /* Master copies of longjmp breakpoints. These are always installed
154 as soon as an objfile containing longjmp is loaded, but they are
155 always disabled. While necessary, temporary clones of bp_longjmp
156 type will be created and enabled. */
157
158 bp_longjmp_master,
159
160 /* Master copies of std::terminate breakpoints. */
161 bp_std_terminate_master,
162
163 /* Like bp_longjmp_master, but for exceptions. */
164 bp_exception_master,
165
166 bp_catchpoint,
167
168 bp_tracepoint,
169 bp_fast_tracepoint,
170 bp_static_tracepoint,
171
172 /* A dynamic printf stops at the given location, does a formatted
173 print, then automatically continues. (Although this is sort of
174 like a macro packaging up standard breakpoint functionality,
175 GDB doesn't have a way to construct types of breakpoint from
176 elements of behavior.) */
177 bp_dprintf,
178
179 /* Event for JIT compiled code generation or deletion. */
180 bp_jit_event,
181
182 /* Breakpoint is placed at the STT_GNU_IFUNC resolver. When hit GDB
183 inserts new bp_gnu_ifunc_resolver_return at the caller.
184 bp_gnu_ifunc_resolver is still being kept here as a different thread
185 may still hit it before bp_gnu_ifunc_resolver_return is hit by the
186 original thread. */
187 bp_gnu_ifunc_resolver,
188
189 /* On its hit GDB now know the resolved address of the target
190 STT_GNU_IFUNC function. Associated bp_gnu_ifunc_resolver can be
191 deleted now and the breakpoint moved to the target function entry
192 point. */
193 bp_gnu_ifunc_resolver_return,
194 };
195
196 /* States of enablement of breakpoint. */
197
198 enum enable_state
199 {
200 bp_disabled, /* The eventpoint is inactive, and cannot
201 trigger. */
202 bp_enabled, /* The eventpoint is active, and can
203 trigger. */
204 bp_call_disabled, /* The eventpoint has been disabled while a
205 call into the inferior is "in flight",
206 because some eventpoints interfere with
207 the implementation of a call on some
208 targets. The eventpoint will be
209 automatically enabled and reset when the
210 call "lands" (either completes, or stops
211 at another eventpoint). */
212 };
213
214
215 /* Disposition of breakpoint. Ie: what to do after hitting it. */
216
217 enum bpdisp
218 {
219 disp_del, /* Delete it */
220 disp_del_at_next_stop, /* Delete at next stop,
221 whether hit or not */
222 disp_disable, /* Disable it */
223 disp_donttouch /* Leave it alone */
224 };
225
226 /* Status of breakpoint conditions used when synchronizing
227 conditions with the target. */
228
229 enum condition_status
230 {
231 condition_unchanged = 0,
232 condition_modified,
233 condition_updated
234 };
235
236 /* Information used by targets to insert and remove breakpoints. */
237
238 struct bp_target_info
239 {
240 /* Address space at which the breakpoint was placed. */
241 struct address_space *placed_address_space;
242
243 /* Address at which the breakpoint was placed. This is normally
244 the same as REQUESTED_ADDRESS, except when adjustment happens in
245 gdbarch_breakpoint_from_pc. The most common form of adjustment
246 is stripping an alternate ISA marker from the PC which is used
247 to determine the type of breakpoint to insert. */
248 CORE_ADDR placed_address;
249
250 /* Address at which the breakpoint was requested. */
251 CORE_ADDR reqstd_address;
252
253 /* If this is a ranged breakpoint, then this field contains the
254 length of the range that will be watched for execution. */
255 int length;
256
257 /* If the breakpoint lives in memory and reading that memory would
258 give back the breakpoint, instead of the original contents, then
259 the original contents are cached here. Only SHADOW_LEN bytes of
260 this buffer are valid, and only when the breakpoint is inserted. */
261 gdb_byte shadow_contents[BREAKPOINT_MAX];
262
263 /* The length of the data cached in SHADOW_CONTENTS. */
264 int shadow_len;
265
266 /* The breakpoint's kind. It is used in 'kind' parameter in Z
267 packets. */
268 int kind;
269
270 /* Conditions the target should evaluate if it supports target-side
271 breakpoint conditions. These are non-owning pointers. */
272 std::vector<agent_expr *> conditions;
273
274 /* Commands the target should evaluate if it supports target-side
275 breakpoint commands. These are non-owning pointers. */
276 std::vector<agent_expr *> tcommands;
277
278 /* Flag that is true if the breakpoint should be left in place even
279 when GDB is not connected. */
280 int persist;
281 };
282
283 /* GDB maintains two types of information about each breakpoint (or
284 watchpoint, or other related event). The first type corresponds
285 to struct breakpoint; this is a relatively high-level structure
286 which contains the source location(s), stopping conditions, user
287 commands to execute when the breakpoint is hit, and so forth.
288
289 The second type of information corresponds to struct bp_location.
290 Each breakpoint has one or (eventually) more locations associated
291 with it, which represent target-specific and machine-specific
292 mechanisms for stopping the program. For instance, a watchpoint
293 expression may require multiple hardware watchpoints in order to
294 catch all changes in the value of the expression being watched. */
295
296 enum bp_loc_type
297 {
298 bp_loc_software_breakpoint,
299 bp_loc_hardware_breakpoint,
300 bp_loc_hardware_watchpoint,
301 bp_loc_other /* Miscellaneous... */
302 };
303
304 /* This structure is a collection of function pointers that, if
305 available, will be called instead of performing the default action
306 for this bp_loc_type. */
307
308 struct bp_location_ops
309 {
310 /* Destructor. Releases everything from SELF (but not SELF
311 itself). */
312 void (*dtor) (struct bp_location *self);
313 };
314
315 class bp_location
316 {
317 public:
318 bp_location () = default;
319
320 bp_location (const bp_location_ops *ops, breakpoint *owner);
321
322 /* Chain pointer to the next breakpoint location for
323 the same parent breakpoint. */
324 bp_location *next = NULL;
325
326 /* Methods associated with this location. */
327 const bp_location_ops *ops = NULL;
328
329 /* The reference count. */
330 int refc = 0;
331
332 /* Type of this breakpoint location. */
333 bp_loc_type loc_type {};
334
335 /* Each breakpoint location must belong to exactly one higher-level
336 breakpoint. This pointer is NULL iff this bp_location is no
337 longer attached to a breakpoint. For example, when a breakpoint
338 is deleted, its locations may still be found in the
339 moribund_locations list, or if we had stopped for it, in
340 bpstats. */
341 breakpoint *owner = NULL;
342
343 /* Conditional. Break only if this expression's value is nonzero.
344 Unlike string form of condition, which is associated with
345 breakpoint, this is associated with location, since if breakpoint
346 has several locations, the evaluation of expression can be
347 different for different locations. Only valid for real
348 breakpoints; a watchpoint's conditional expression is stored in
349 the owner breakpoint object. */
350 expression_up cond;
351
352 /* Conditional expression in agent expression
353 bytecode form. This is used for stub-side breakpoint
354 condition evaluation. */
355 agent_expr_up cond_bytecode;
356
357 /* Signals that the condition has changed since the last time
358 we updated the global location list. This means the condition
359 needs to be sent to the target again. This is used together
360 with target-side breakpoint conditions.
361
362 condition_unchanged: It means there has been no condition changes.
363
364 condition_modified: It means this location had its condition modified.
365
366 condition_updated: It means we already marked all the locations that are
367 duplicates of this location and thus we don't need to call
368 force_breakpoint_reinsertion (...) for this location. */
369
370 condition_status condition_changed {};
371
372 agent_expr_up cmd_bytecode;
373
374 /* Signals that breakpoint conditions and/or commands need to be
375 re-synched with the target. This has no use other than
376 target-side breakpoints. */
377 bool needs_update = false;
378
379 /* This location's address is in an unloaded solib, and so this
380 location should not be inserted. It will be automatically
381 enabled when that solib is loaded. */
382 bool shlib_disabled = false;
383
384 /* Is this particular location enabled. */
385 bool enabled = false;
386
387 /* Nonzero if this breakpoint is now inserted. */
388 bool inserted = false;
389
390 /* Nonzero if this is a permanent breakpoint. There is a breakpoint
391 instruction hard-wired into the target's code. Don't try to
392 write another breakpoint instruction on top of it, or restore its
393 value. Step over it using the architecture's
394 gdbarch_skip_permanent_breakpoint method. */
395 bool permanent = false;
396
397 /* Nonzero if this is not the first breakpoint in the list
398 for the given address. location of tracepoint can _never_
399 be duplicated with other locations of tracepoints and other
400 kinds of breakpoints, because two locations at the same
401 address may have different actions, so both of these locations
402 should be downloaded and so that `tfind N' always works. */
403 bool duplicate = false;
404
405 /* If we someday support real thread-specific breakpoints, then
406 the breakpoint location will need a thread identifier. */
407
408 /* Data for specific breakpoint types. These could be a union, but
409 simplicity is more important than memory usage for breakpoints. */
410
411 /* Architecture associated with this location's address. May be
412 different from the breakpoint architecture. */
413 struct gdbarch *gdbarch = NULL;
414
415 /* The program space associated with this breakpoint location
416 address. Note that an address space may be represented in more
417 than one program space (e.g. each uClinux program will be given
418 its own program space, but there will only be one address space
419 for all of them), but we must not insert more than one location
420 at the same address in the same address space. */
421 program_space *pspace = NULL;
422
423 /* Note that zero is a perfectly valid code address on some platforms
424 (for example, the mn10200 (OBSOLETE) and mn10300 simulators). NULL
425 is not a special value for this field. Valid for all types except
426 bp_loc_other. */
427 CORE_ADDR address = 0;
428
429 /* For hardware watchpoints, the size of the memory region being
430 watched. For hardware ranged breakpoints, the size of the
431 breakpoint range. */
432 int length = 0;
433
434 /* Type of hardware watchpoint. */
435 target_hw_bp_type watchpoint_type {};
436
437 /* For any breakpoint type with an address, this is the section
438 associated with the address. Used primarily for overlay
439 debugging. */
440 obj_section *section = NULL;
441
442 /* Address at which breakpoint was requested, either by the user or
443 by GDB for internal breakpoints. This will usually be the same
444 as ``address'' (above) except for cases in which
445 ADJUST_BREAKPOINT_ADDRESS has computed a different address at
446 which to place the breakpoint in order to comply with a
447 processor's architectual constraints. */
448 CORE_ADDR requested_address = 0;
449
450 /* An additional address assigned with this location. This is currently
451 only used by STT_GNU_IFUNC resolver breakpoints to hold the address
452 of the resolver function. */
453 CORE_ADDR related_address = 0;
454
455 /* If the location comes from a probe point, this is the probe associated
456 with it. */
457 bound_probe probe {};
458
459 char *function_name = NULL;
460
461 /* Details of the placed breakpoint, when inserted. */
462 bp_target_info target_info {};
463
464 /* Similarly, for the breakpoint at an overlay's LMA, if necessary. */
465 bp_target_info overlay_target_info {};
466
467 /* In a non-stop mode, it's possible that we delete a breakpoint,
468 but as we do that, some still running thread hits that breakpoint.
469 For that reason, we need to keep locations belonging to deleted
470 breakpoints for a bit, so that don't report unexpected SIGTRAP.
471 We can't keep such locations forever, so we use a heuristic --
472 after we process certain number of inferior events since
473 breakpoint was deleted, we retire all locations of that breakpoint.
474 This variable keeps a number of events still to go, when
475 it becomes 0 this location is retired. */
476 int events_till_retirement = 0;
477
478 /* Line number which was used to place this location.
479
480 Breakpoint placed into a comment keeps it's user specified line number
481 despite ADDRESS resolves into a different line number. */
482
483 int line_number = 0;
484
485 /* Symtab which was used to place this location. This is used
486 to find the corresponding source file name. */
487
488 struct symtab *symtab = NULL;
489
490 /* The symbol found by the location parser, if any. This may be used to
491 ascertain when an event location was set at a different location than
492 the one originally selected by parsing, e.g., inlined symbols. */
493 const struct symbol *symbol = NULL;
494 };
495
496 /* The possible return values for print_bpstat, print_it_normal,
497 print_it_done, print_it_noop. */
498 enum print_stop_action
499 {
500 /* We printed nothing or we need to do some more analysis. */
501 PRINT_UNKNOWN = -1,
502
503 /* We printed something, and we *do* desire that something to be
504 followed by a location. */
505 PRINT_SRC_AND_LOC,
506
507 /* We printed something, and we do *not* desire that something to be
508 followed by a location. */
509 PRINT_SRC_ONLY,
510
511 /* We already printed all we needed to print, don't print anything
512 else. */
513 PRINT_NOTHING
514 };
515
516 /* This structure is a collection of function pointers that, if available,
517 will be called instead of the performing the default action for this
518 bptype. */
519
520 struct breakpoint_ops
521 {
522 /* Allocate a location for this breakpoint. */
523 struct bp_location * (*allocate_location) (struct breakpoint *);
524
525 /* Reevaluate a breakpoint. This is necessary after symbols change
526 (e.g., an executable or DSO was loaded, or the inferior just
527 started). */
528 void (*re_set) (struct breakpoint *self);
529
530 /* Insert the breakpoint or watchpoint or activate the catchpoint.
531 Return 0 for success, 1 if the breakpoint, watchpoint or
532 catchpoint type is not supported, -1 for failure. */
533 int (*insert_location) (struct bp_location *);
534
535 /* Remove the breakpoint/catchpoint that was previously inserted
536 with the "insert" method above. Return 0 for success, 1 if the
537 breakpoint, watchpoint or catchpoint type is not supported,
538 -1 for failure. */
539 int (*remove_location) (struct bp_location *, enum remove_bp_reason reason);
540
541 /* Return true if it the target has stopped due to hitting
542 breakpoint location BL. This function does not check if we
543 should stop, only if BL explains the stop. ASPACE is the address
544 space in which the event occurred, BP_ADDR is the address at
545 which the inferior stopped, and WS is the target_waitstatus
546 describing the event. */
547 int (*breakpoint_hit) (const struct bp_location *bl,
548 const address_space *aspace,
549 CORE_ADDR bp_addr,
550 const struct target_waitstatus *ws);
551
552 /* Check internal conditions of the breakpoint referred to by BS.
553 If we should not stop for this breakpoint, set BS->stop to 0. */
554 void (*check_status) (struct bpstats *bs);
555
556 /* Tell how many hardware resources (debug registers) are needed
557 for this breakpoint. If this function is not provided, then
558 the breakpoint or watchpoint needs one debug register. */
559 int (*resources_needed) (const struct bp_location *);
560
561 /* Tell whether we can downgrade from a hardware watchpoint to a software
562 one. If not, the user will not be able to enable the watchpoint when
563 there are not enough hardware resources available. */
564 int (*works_in_software_mode) (const struct breakpoint *);
565
566 /* The normal print routine for this breakpoint, called when we
567 hit it. */
568 enum print_stop_action (*print_it) (struct bpstats *bs);
569
570 /* Display information about this breakpoint, for "info
571 breakpoints". */
572 void (*print_one) (struct breakpoint *, struct bp_location **);
573
574 /* Display extra information about this breakpoint, below the normal
575 breakpoint description in "info breakpoints".
576
577 In the example below, the "address range" line was printed
578 by print_one_detail_ranged_breakpoint.
579
580 (gdb) info breakpoints
581 Num Type Disp Enb Address What
582 2 hw breakpoint keep y in main at test-watch.c:70
583 address range: [0x10000458, 0x100004c7]
584
585 */
586 void (*print_one_detail) (const struct breakpoint *, struct ui_out *);
587
588 /* Display information about this breakpoint after setting it
589 (roughly speaking; this is called from "mention"). */
590 void (*print_mention) (struct breakpoint *);
591
592 /* Print to FP the CLI command that recreates this breakpoint. */
593 void (*print_recreate) (struct breakpoint *, struct ui_file *fp);
594
595 /* Create SALs from location, storing the result in linespec_result.
596
597 For an explanation about the arguments, see the function
598 `create_sals_from_location_default'.
599
600 This function is called inside `create_breakpoint'. */
601 void (*create_sals_from_location) (const struct event_location *location,
602 struct linespec_result *canonical,
603 enum bptype type_wanted);
604
605 /* This method will be responsible for creating a breakpoint given its SALs.
606 Usually, it just calls `create_breakpoints_sal' (for ordinary
607 breakpoints). However, there may be some special cases where we might
608 need to do some tweaks, e.g., see
609 `strace_marker_create_breakpoints_sal'.
610
611 This function is called inside `create_breakpoint'. */
612 void (*create_breakpoints_sal) (struct gdbarch *,
613 struct linespec_result *,
614 gdb::unique_xmalloc_ptr<char>,
615 gdb::unique_xmalloc_ptr<char>,
616 enum bptype, enum bpdisp, int, int,
617 int, const struct breakpoint_ops *,
618 int, int, int, unsigned);
619
620 /* Given the location (second parameter), this method decodes it and
621 returns the SAL locations related to it. For ordinary
622 breakpoints, it calls `decode_line_full'. If SEARCH_PSPACE is
623 not NULL, symbol search is restricted to just that program space.
624
625 This function is called inside `location_to_sals'. */
626 std::vector<symtab_and_line> (*decode_location)
627 (struct breakpoint *b,
628 const struct event_location *location,
629 struct program_space *search_pspace);
630
631 /* Return true if this breakpoint explains a signal. See
632 bpstat_explains_signal. */
633 int (*explains_signal) (struct breakpoint *, enum gdb_signal);
634
635 /* Called after evaluating the breakpoint's condition,
636 and only if it evaluated true. */
637 void (*after_condition_true) (struct bpstats *bs);
638 };
639
640 /* Helper for breakpoint_ops->print_recreate implementations. Prints
641 the "thread" or "task" condition of B, and then a newline.
642
643 Necessary because most breakpoint implementations accept
644 thread/task conditions at the end of the spec line, like "break foo
645 thread 1", which needs outputting before any breakpoint-type
646 specific extra command necessary for B's recreation. */
647 extern void print_recreate_thread (struct breakpoint *b, struct ui_file *fp);
648
649 enum watchpoint_triggered
650 {
651 /* This watchpoint definitely did not trigger. */
652 watch_triggered_no = 0,
653
654 /* Some hardware watchpoint triggered, and it might have been this
655 one, but we do not know which it was. */
656 watch_triggered_unknown,
657
658 /* This hardware watchpoint definitely did trigger. */
659 watch_triggered_yes
660 };
661
662 typedef struct bp_location *bp_location_p;
663 DEF_VEC_P(bp_location_p);
664
665 /* A reference-counted struct command_line. This is an implementation
666 detail to the breakpoints module. */
667 typedef std::shared_ptr<command_line> counted_command_line;
668
669 /* Some targets (e.g., embedded PowerPC) need two debug registers to set
670 a watchpoint over a memory region. If this flag is true, GDB will use
671 only one register per watchpoint, thus assuming that all acesses that
672 modify a memory location happen at its starting address. */
673
674 extern int target_exact_watchpoints;
675
676 /* Note that the ->silent field is not currently used by any commands
677 (though the code is in there if it was to be, and set_raw_breakpoint
678 does set it to 0). I implemented it because I thought it would be
679 useful for a hack I had to put in; I'm going to leave it in because
680 I can see how there might be times when it would indeed be useful */
681
682 /* This is for all kinds of breakpoints. */
683
684 struct breakpoint
685 {
686 virtual ~breakpoint ();
687
688 /* Methods associated with this breakpoint. */
689 const breakpoint_ops *ops = NULL;
690
691 breakpoint *next = NULL;
692 /* Type of breakpoint. */
693 bptype type = bp_none;
694 /* Zero means disabled; remember the info but don't break here. */
695 enum enable_state enable_state = bp_enabled;
696 /* What to do with this breakpoint after we hit it. */
697 bpdisp disposition = disp_del;
698 /* Number assigned to distinguish breakpoints. */
699 int number = 0;
700
701 /* Location(s) associated with this high-level breakpoint. */
702 bp_location *loc = NULL;
703
704 /* True means a silent breakpoint (don't print frame info if we stop
705 here). */
706 bool silent = false;
707 /* True means display ADDR_STRING to the user verbatim. */
708 bool display_canonical = false;
709 /* Number of stops at this breakpoint that should be continued
710 automatically before really stopping. */
711 int ignore_count = 0;
712
713 /* Number of stops at this breakpoint before it will be
714 disabled. */
715 int enable_count = 0;
716
717 /* Chain of command lines to execute when this breakpoint is
718 hit. */
719 counted_command_line commands;
720 /* Stack depth (address of frame). If nonzero, break only if fp
721 equals this. */
722 struct frame_id frame_id = null_frame_id;
723
724 /* The program space used to set the breakpoint. This is only set
725 for breakpoints which are specific to a program space; for
726 non-thread-specific ordinary breakpoints this is NULL. */
727 program_space *pspace = NULL;
728
729 /* Location we used to set the breakpoint. */
730 event_location_up location;
731
732 /* The filter that should be passed to decode_line_full when
733 re-setting this breakpoint. This may be NULL, but otherwise is
734 allocated with xmalloc. */
735 char *filter = NULL;
736
737 /* For a ranged breakpoint, the location we used to find the end of
738 the range. */
739 event_location_up location_range_end;
740
741 /* Architecture we used to set the breakpoint. */
742 struct gdbarch *gdbarch = NULL;
743 /* Language we used to set the breakpoint. */
744 enum language language = language_unknown;
745 /* Input radix we used to set the breakpoint. */
746 int input_radix = 0;
747 /* String form of the breakpoint condition (malloc'd), or NULL if
748 there is no condition. */
749 char *cond_string = NULL;
750
751 /* String form of extra parameters, or NULL if there are none.
752 Malloc'd. */
753 char *extra_string = NULL;
754
755 /* Holds the address of the related watchpoint_scope breakpoint when
756 using watchpoints on local variables (might the concept of a
757 related breakpoint be useful elsewhere, if not just call it the
758 watchpoint_scope breakpoint or something like that. FIXME). */
759 breakpoint *related_breakpoint = NULL;
760
761 /* Thread number for thread-specific breakpoint, or -1 if don't
762 care. */
763 int thread = -1;
764
765 /* Ada task number for task-specific breakpoint, or 0 if don't
766 care. */
767 int task = 0;
768
769 /* Count of the number of times this breakpoint was taken, dumped
770 with the info, but not used for anything else. Useful for seeing
771 how many times you hit a break prior to the program aborting, so
772 you can back up to just before the abort. */
773 int hit_count = 0;
774
775 /* Is breakpoint's condition not yet parsed because we found no
776 location initially so had no context to parse the condition
777 in. */
778 int condition_not_parsed = 0;
779
780 /* With a Python scripting enabled GDB, store a reference to the
781 Python object that has been associated with this breakpoint.
782 This is always NULL for a GDB that is not script enabled. It can
783 sometimes be NULL for enabled GDBs as not all breakpoint types
784 are tracked by the scripting language API. */
785 gdbpy_breakpoint_object *py_bp_object = NULL;
786
787 /* Same as py_bp_object, but for Scheme. */
788 gdbscm_breakpoint_object *scm_bp_object = NULL;
789 };
790
791 /* An instance of this type is used to represent a watchpoint. */
792
793 struct watchpoint : public breakpoint
794 {
795 ~watchpoint () override;
796
797 /* String form of exp to use for displaying to the user (malloc'd),
798 or NULL if none. */
799 char *exp_string;
800 /* String form to use for reparsing of EXP (malloc'd) or NULL. */
801 char *exp_string_reparse;
802
803 /* The expression we are watching, or NULL if not a watchpoint. */
804 expression_up exp;
805 /* The largest block within which it is valid, or NULL if it is
806 valid anywhere (e.g. consists just of global symbols). */
807 const struct block *exp_valid_block;
808 /* The conditional expression if any. */
809 expression_up cond_exp;
810 /* The largest block within which it is valid, or NULL if it is
811 valid anywhere (e.g. consists just of global symbols). */
812 const struct block *cond_exp_valid_block;
813 /* Value of the watchpoint the last time we checked it, or NULL when
814 we do not know the value yet or the value was not readable. VAL
815 is never lazy. */
816 struct value *val;
817 /* Nonzero if VAL is valid. If VAL_VALID is set but VAL is NULL,
818 then an error occurred reading the value. */
819 int val_valid;
820
821 /* When watching the location of a bitfield, contains the offset and size of
822 the bitfield. Otherwise contains 0. */
823 int val_bitpos;
824 int val_bitsize;
825
826 /* Holds the frame address which identifies the frame this
827 watchpoint should be evaluated in, or `null' if the watchpoint
828 should be evaluated on the outermost frame. */
829 struct frame_id watchpoint_frame;
830
831 /* Holds the thread which identifies the frame this watchpoint
832 should be considered in scope for, or `null_ptid' if the
833 watchpoint should be evaluated in all threads. */
834 ptid_t watchpoint_thread;
835
836 /* For hardware watchpoints, the triggered status according to the
837 hardware. */
838 enum watchpoint_triggered watchpoint_triggered;
839
840 /* Whether this watchpoint is exact (see
841 target_exact_watchpoints). */
842 int exact;
843
844 /* The mask address for a masked hardware watchpoint. */
845 CORE_ADDR hw_wp_mask;
846 };
847
848 /* Given a function FUNC (struct breakpoint *B, void *DATA) and
849 USER_DATA, call FUNC for every known breakpoint passing USER_DATA
850 as argument.
851
852 If FUNC returns 1, the loop stops and the current
853 'struct breakpoint' being processed is returned. If FUNC returns
854 zero, the loop continues.
855
856 This function returns either a 'struct breakpoint' pointer or NULL.
857 It was based on BFD's bfd_sections_find_if function. */
858
859 extern struct breakpoint *breakpoint_find_if
860 (int (*func) (struct breakpoint *b, void *d), void *user_data);
861
862 /* Return true if BPT is either a software breakpoint or a hardware
863 breakpoint. */
864
865 extern int is_breakpoint (const struct breakpoint *bpt);
866
867 /* Returns true if BPT is really a watchpoint. */
868
869 extern int is_watchpoint (const struct breakpoint *bpt);
870
871 /* An instance of this type is used to represent all kinds of
872 tracepoints. */
873
874 struct tracepoint : public breakpoint
875 {
876 /* Number of times this tracepoint should single-step and collect
877 additional data. */
878 long step_count;
879
880 /* Number of times this tracepoint should be hit before
881 disabling/ending. */
882 int pass_count;
883
884 /* The number of the tracepoint on the target. */
885 int number_on_target;
886
887 /* The total space taken by all the trace frames for this
888 tracepoint. */
889 ULONGEST traceframe_usage;
890
891 /* The static tracepoint marker id, if known. */
892 char *static_trace_marker_id;
893
894 /* LTTng/UST allow more than one marker with the same ID string,
895 although it unadvised because it confuses tools. When setting
896 static tracepoints by marker ID, this will record the index in
897 the array of markers we found for the given marker ID for which
898 this static tracepoint corresponds. When resetting breakpoints,
899 we will use this index to try to find the same marker again. */
900 int static_trace_marker_id_idx;
901 };
902
903 typedef struct breakpoint *breakpoint_p;
904 DEF_VEC_P(breakpoint_p);
905
906 /* The following stuff is an abstract data type "bpstat" ("breakpoint
907 status"). This provides the ability to determine whether we have
908 stopped at a breakpoint, and what we should do about it. */
909
910 typedef struct bpstats *bpstat;
911
912 /* Clears a chain of bpstat, freeing storage
913 of each. */
914 extern void bpstat_clear (bpstat *);
915
916 /* Return a copy of a bpstat. Like "bs1 = bs2" but all storage that
917 is part of the bpstat is copied as well. */
918 extern bpstat bpstat_copy (bpstat);
919
920 extern bpstat bpstat_stop_status (const address_space *aspace,
921 CORE_ADDR pc, ptid_t ptid,
922 const struct target_waitstatus *ws);
923
924 /* This bpstat_what stuff tells wait_for_inferior what to do with a
925 breakpoint (a challenging task).
926
927 The enum values order defines priority-like order of the actions.
928 Once you've decided that some action is appropriate, you'll never
929 go back and decide something of a lower priority is better. Each
930 of these actions is mutually exclusive with the others. That
931 means, that if you find yourself adding a new action class here and
932 wanting to tell GDB that you have two simultaneous actions to
933 handle, something is wrong, and you probably don't actually need a
934 new action type.
935
936 Note that a step resume breakpoint overrides another breakpoint of
937 signal handling (see comment in wait_for_inferior at where we set
938 the step_resume breakpoint). */
939
940 enum bpstat_what_main_action
941 {
942 /* Perform various other tests; that is, this bpstat does not
943 say to perform any action (e.g. failed watchpoint and nothing
944 else). */
945 BPSTAT_WHAT_KEEP_CHECKING,
946
947 /* Remove breakpoints, single step once, then put them back in and
948 go back to what we were doing. It's possible that this should
949 be removed from the main_action and put into a separate field,
950 to more cleanly handle
951 BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE. */
952 BPSTAT_WHAT_SINGLE,
953
954 /* Set longjmp_resume breakpoint, remove all other breakpoints,
955 and continue. The "remove all other breakpoints" part is
956 required if we are also stepping over another breakpoint as
957 well as doing the longjmp handling. */
958 BPSTAT_WHAT_SET_LONGJMP_RESUME,
959
960 /* Clear longjmp_resume breakpoint, then handle as
961 BPSTAT_WHAT_KEEP_CHECKING. */
962 BPSTAT_WHAT_CLEAR_LONGJMP_RESUME,
963
964 /* Clear step resume breakpoint, and keep checking. */
965 BPSTAT_WHAT_STEP_RESUME,
966
967 /* Rather than distinguish between noisy and silent stops here, it
968 might be cleaner to have bpstat_print make that decision (also
969 taking into account stop_print_frame and source_only). But the
970 implications are a bit scary (interaction with auto-displays,
971 etc.), so I won't try it. */
972
973 /* Stop silently. */
974 BPSTAT_WHAT_STOP_SILENT,
975
976 /* Stop and print. */
977 BPSTAT_WHAT_STOP_NOISY,
978
979 /* Clear step resume breakpoint, and keep checking. High-priority
980 step-resume breakpoints are used when even if there's a user
981 breakpoint at the current PC when we set the step-resume
982 breakpoint, we don't want to re-handle any breakpoint other
983 than the step-resume when it's hit; instead we want to move
984 past the breakpoint. This is used in the case of skipping
985 signal handlers. */
986 BPSTAT_WHAT_HP_STEP_RESUME,
987 };
988
989 /* An enum indicating the kind of "stack dummy" stop. This is a bit
990 of a misnomer because only one kind of truly a stack dummy. */
991 enum stop_stack_kind
992 {
993 /* We didn't stop at a stack dummy breakpoint. */
994 STOP_NONE = 0,
995
996 /* Stopped at a stack dummy. */
997 STOP_STACK_DUMMY,
998
999 /* Stopped at std::terminate. */
1000 STOP_STD_TERMINATE
1001 };
1002
1003 struct bpstat_what
1004 {
1005 enum bpstat_what_main_action main_action;
1006
1007 /* Did we hit a call dummy breakpoint? This only goes with a
1008 main_action of BPSTAT_WHAT_STOP_SILENT or
1009 BPSTAT_WHAT_STOP_NOISY (the concept of continuing from a call
1010 dummy without popping the frame is not a useful one). */
1011 enum stop_stack_kind call_dummy;
1012
1013 /* Used for BPSTAT_WHAT_SET_LONGJMP_RESUME and
1014 BPSTAT_WHAT_CLEAR_LONGJMP_RESUME. True if we are handling a
1015 longjmp, false if we are handling an exception. */
1016 int is_longjmp;
1017 };
1018
1019 /* Tell what to do about this bpstat. */
1020 struct bpstat_what bpstat_what (bpstat);
1021
1022 /* Run breakpoint event callbacks associated with the breakpoints that
1023 triggered. */
1024 extern void bpstat_run_callbacks (bpstat bs_head);
1025
1026 /* Find the bpstat associated with a breakpoint. NULL otherwise. */
1027 bpstat bpstat_find_breakpoint (bpstat, struct breakpoint *);
1028
1029 /* Nonzero if a signal that we got in target_wait() was due to
1030 circumstances explained by the bpstat; the signal is therefore not
1031 random. */
1032 extern int bpstat_explains_signal (bpstat, enum gdb_signal);
1033
1034 /* Nonzero is this bpstat causes a stop. */
1035 extern int bpstat_causes_stop (bpstat);
1036
1037 /* Nonzero if we should step constantly (e.g. watchpoints on machines
1038 without hardware support). This isn't related to a specific bpstat,
1039 just to things like whether watchpoints are set. */
1040 extern int bpstat_should_step (void);
1041
1042 /* Print a message indicating what happened. Returns nonzero to
1043 say that only the source line should be printed after this (zero
1044 return means print the frame as well as the source line). */
1045 extern enum print_stop_action bpstat_print (bpstat, int);
1046
1047 /* Put in *NUM the breakpoint number of the first breakpoint we are
1048 stopped at. *BSP upon return is a bpstat which points to the
1049 remaining breakpoints stopped at (but which is not guaranteed to be
1050 good for anything but further calls to bpstat_num).
1051
1052 Return 0 if passed a bpstat which does not indicate any breakpoints.
1053 Return -1 if stopped at a breakpoint that has been deleted since
1054 we set it.
1055 Return 1 otherwise. */
1056 extern int bpstat_num (bpstat *, int *);
1057
1058 /* Perform actions associated with the stopped inferior. Actually, we
1059 just use this for breakpoint commands. Perhaps other actions will
1060 go here later, but this is executed at a late time (from the
1061 command loop). */
1062 extern void bpstat_do_actions (void);
1063
1064 /* Modify all entries of STOP_BPSTAT of INFERIOR_PTID so that the actions will
1065 not be performed. */
1066 extern void bpstat_clear_actions (void);
1067
1068 /* Implementation: */
1069
1070 /* Values used to tell the printing routine how to behave for this
1071 bpstat. */
1072 enum bp_print_how
1073 {
1074 /* This is used when we want to do a normal printing of the reason
1075 for stopping. The output will depend on the type of eventpoint
1076 we are dealing with. This is the default value, most commonly
1077 used. */
1078 print_it_normal,
1079 /* This is used when nothing should be printed for this bpstat
1080 entry. */
1081 print_it_noop,
1082 /* This is used when everything which needs to be printed has
1083 already been printed. But we still want to print the frame. */
1084 print_it_done
1085 };
1086
1087 struct bpstats
1088 {
1089 bpstats ();
1090 bpstats (struct bp_location *bl, bpstat **bs_link_pointer);
1091 ~bpstats ();
1092
1093 bpstats (const bpstats &);
1094 bpstats &operator= (const bpstats &) = delete;
1095
1096 /* Linked list because there can be more than one breakpoint at
1097 the same place, and a bpstat reflects the fact that all have
1098 been hit. */
1099 bpstat next;
1100
1101 /* Location that caused the stop. Locations are refcounted, so
1102 this will never be NULL. Note that this location may end up
1103 detached from a breakpoint, but that does not necessary mean
1104 that the struct breakpoint is gone. E.g., consider a
1105 watchpoint with a condition that involves an inferior function
1106 call. Watchpoint locations are recreated often (on resumes,
1107 hence on infcalls too). Between creating the bpstat and after
1108 evaluating the watchpoint condition, this location may hence
1109 end up detached from its original owner watchpoint, even though
1110 the watchpoint is still listed. If it's condition evaluates as
1111 true, we still want this location to cause a stop, and we will
1112 still need to know which watchpoint it was originally attached.
1113 What this means is that we should not (in most cases) follow
1114 the `bpstat->bp_location->owner' link, but instead use the
1115 `breakpoint_at' field below. */
1116 struct bp_location *bp_location_at;
1117
1118 /* Breakpoint that caused the stop. This is nullified if the
1119 breakpoint ends up being deleted. See comments on
1120 `bp_location_at' above for why do we need this field instead of
1121 following the location's owner. */
1122 struct breakpoint *breakpoint_at;
1123
1124 /* The associated command list. */
1125 counted_command_line commands;
1126
1127 /* Old value associated with a watchpoint. */
1128 struct value *old_val;
1129
1130 /* Nonzero if this breakpoint tells us to print the frame. */
1131 char print;
1132
1133 /* Nonzero if this breakpoint tells us to stop. */
1134 char stop;
1135
1136 /* Tell bpstat_print and print_bp_stop_message how to print stuff
1137 associated with this element of the bpstat chain. */
1138 enum bp_print_how print_it;
1139 };
1140
1141 enum inf_context
1142 {
1143 inf_starting,
1144 inf_running,
1145 inf_exited,
1146 inf_execd
1147 };
1148
1149 /* The possible return values for breakpoint_here_p.
1150 We guarantee that zero always means "no breakpoint here". */
1151 enum breakpoint_here
1152 {
1153 no_breakpoint_here = 0,
1154 ordinary_breakpoint_here,
1155 permanent_breakpoint_here
1156 };
1157
1158
1159 /* Prototypes for breakpoint-related functions. */
1160
1161 /* Return 1 if there's a program/permanent breakpoint planted in
1162 memory at ADDRESS, return 0 otherwise. */
1163
1164 extern int program_breakpoint_here_p (struct gdbarch *gdbarch, CORE_ADDR address);
1165
1166 extern enum breakpoint_here breakpoint_here_p (const address_space *,
1167 CORE_ADDR);
1168
1169 /* Return true if an enabled breakpoint exists in the range defined by
1170 ADDR and LEN, in ASPACE. */
1171 extern int breakpoint_in_range_p (const address_space *aspace,
1172 CORE_ADDR addr, ULONGEST len);
1173
1174 extern int moribund_breakpoint_here_p (const address_space *, CORE_ADDR);
1175
1176 extern int breakpoint_inserted_here_p (const address_space *,
1177 CORE_ADDR);
1178
1179 extern int software_breakpoint_inserted_here_p (const address_space *,
1180 CORE_ADDR);
1181
1182 /* Return non-zero iff there is a hardware breakpoint inserted at
1183 PC. */
1184 extern int hardware_breakpoint_inserted_here_p (const address_space *,
1185 CORE_ADDR);
1186
1187 /* Check whether any location of BP is inserted at PC. */
1188
1189 extern int breakpoint_has_location_inserted_here (struct breakpoint *bp,
1190 const address_space *aspace,
1191 CORE_ADDR pc);
1192
1193 extern int single_step_breakpoint_inserted_here_p (const address_space *,
1194 CORE_ADDR);
1195
1196 /* Returns true if there's a hardware watchpoint or access watchpoint
1197 inserted in the range defined by ADDR and LEN. */
1198 extern int hardware_watchpoint_inserted_in_range (const address_space *,
1199 CORE_ADDR addr,
1200 ULONGEST len);
1201
1202 /* Returns true if {ASPACE1,ADDR1} and {ASPACE2,ADDR2} represent the
1203 same breakpoint location. In most targets, this can only be true
1204 if ASPACE1 matches ASPACE2. On targets that have global
1205 breakpoints, the address space doesn't really matter. */
1206
1207 extern int breakpoint_address_match (const address_space *aspace1,
1208 CORE_ADDR addr1,
1209 const address_space *aspace2,
1210 CORE_ADDR addr2);
1211
1212 extern void until_break_command (const char *, int, int);
1213
1214 /* Initialize a struct bp_location. */
1215
1216 extern void update_breakpoint_locations
1217 (struct breakpoint *b,
1218 struct program_space *filter_pspace,
1219 gdb::array_view<const symtab_and_line> sals,
1220 gdb::array_view<const symtab_and_line> sals_end);
1221
1222 extern void breakpoint_re_set (void);
1223
1224 extern void breakpoint_re_set_thread (struct breakpoint *);
1225
1226 extern void delete_breakpoint (struct breakpoint *);
1227
1228 struct breakpoint_deleter
1229 {
1230 void operator() (struct breakpoint *b) const
1231 {
1232 delete_breakpoint (b);
1233 }
1234 };
1235
1236 typedef std::unique_ptr<struct breakpoint, breakpoint_deleter> breakpoint_up;
1237
1238 extern breakpoint_up set_momentary_breakpoint
1239 (struct gdbarch *, struct symtab_and_line, struct frame_id, enum bptype);
1240
1241 extern breakpoint_up set_momentary_breakpoint_at_pc
1242 (struct gdbarch *, CORE_ADDR pc, enum bptype type);
1243
1244 extern struct breakpoint *clone_momentary_breakpoint (struct breakpoint *bpkt);
1245
1246 extern void set_ignore_count (int, int, int);
1247
1248 extern void breakpoint_init_inferior (enum inf_context);
1249
1250 extern void breakpoint_auto_delete (bpstat);
1251
1252 typedef void (*walk_bp_location_callback) (struct bp_location *, void *);
1253
1254 extern void iterate_over_bp_locations (walk_bp_location_callback);
1255
1256 /* Return the chain of command lines to execute when this breakpoint
1257 is hit. */
1258 extern struct command_line *breakpoint_commands (struct breakpoint *b);
1259
1260 /* Return a string image of DISP. The string is static, and thus should
1261 NOT be deallocated after use. */
1262 const char *bpdisp_text (enum bpdisp disp);
1263
1264 extern void break_command (const char *, int);
1265
1266 extern void hbreak_command_wrapper (const char *, int);
1267 extern void thbreak_command_wrapper (const char *, int);
1268 extern void rbreak_command_wrapper (const char *, int);
1269 extern void watch_command_wrapper (const char *, int, int);
1270 extern void awatch_command_wrapper (const char *, int, int);
1271 extern void rwatch_command_wrapper (const char *, int, int);
1272 extern void tbreak_command (const char *, int);
1273
1274 extern struct breakpoint_ops base_breakpoint_ops;
1275 extern struct breakpoint_ops bkpt_breakpoint_ops;
1276 extern struct breakpoint_ops tracepoint_breakpoint_ops;
1277 extern struct breakpoint_ops dprintf_breakpoint_ops;
1278
1279 extern void initialize_breakpoint_ops (void);
1280
1281 /* Arguments to pass as context to some catch command handlers. */
1282 #define CATCH_PERMANENT ((void *) (uintptr_t) 0)
1283 #define CATCH_TEMPORARY ((void *) (uintptr_t) 1)
1284
1285 /* Like add_cmd, but add the command to both the "catch" and "tcatch"
1286 lists, and pass some additional user data to the command
1287 function. */
1288
1289 extern void
1290 add_catch_command (const char *name, const char *docstring,
1291 cmd_const_sfunc_ftype *sfunc,
1292 completer_ftype *completer,
1293 void *user_data_catch,
1294 void *user_data_tcatch);
1295
1296 /* Initialize a breakpoint struct for Ada exception catchpoints. */
1297
1298 extern void
1299 init_ada_exception_breakpoint (struct breakpoint *b,
1300 struct gdbarch *gdbarch,
1301 struct symtab_and_line sal,
1302 const char *addr_string,
1303 const struct breakpoint_ops *ops,
1304 int tempflag,
1305 int enabled,
1306 int from_tty);
1307
1308 extern void init_catchpoint (struct breakpoint *b,
1309 struct gdbarch *gdbarch, int tempflag,
1310 const char *cond_string,
1311 const struct breakpoint_ops *ops);
1312
1313 /* Add breakpoint B on the breakpoint list, and notify the user, the
1314 target and breakpoint_created observers of its existence. If
1315 INTERNAL is non-zero, the breakpoint number will be allocated from
1316 the internal breakpoint count. If UPDATE_GLL is non-zero,
1317 update_global_location_list will be called. */
1318
1319 extern void install_breakpoint (int internal, std::unique_ptr<breakpoint> &&b,
1320 int update_gll);
1321
1322 /* Flags that can be passed down to create_breakpoint, etc., to affect
1323 breakpoint creation in several ways. */
1324
1325 enum breakpoint_create_flags
1326 {
1327 /* We're adding a breakpoint to our tables that is already
1328 inserted in the target. */
1329 CREATE_BREAKPOINT_FLAGS_INSERTED = 1 << 0
1330 };
1331
1332 /* Set a breakpoint. This function is shared between CLI and MI functions
1333 for setting a breakpoint at LOCATION.
1334
1335 This function has two major modes of operations, selected by the
1336 PARSE_EXTRA parameter.
1337
1338 If PARSE_EXTRA is zero, LOCATION is just the breakpoint's location,
1339 with condition, thread, and extra string specified by the COND_STRING,
1340 THREAD, and EXTRA_STRING parameters.
1341
1342 If PARSE_EXTRA is non-zero, this function will attempt to extract
1343 the condition, thread, and extra string from EXTRA_STRING, ignoring
1344 the similarly named parameters.
1345
1346 If INTERNAL is non-zero, the breakpoint number will be allocated
1347 from the internal breakpoint count.
1348
1349 Returns true if any breakpoint was created; false otherwise. */
1350
1351 extern int create_breakpoint (struct gdbarch *gdbarch,
1352 const struct event_location *location,
1353 const char *cond_string, int thread,
1354 const char *extra_string,
1355 int parse_extra,
1356 int tempflag, enum bptype wanted_type,
1357 int ignore_count,
1358 enum auto_boolean pending_break_support,
1359 const struct breakpoint_ops *ops,
1360 int from_tty,
1361 int enabled,
1362 int internal, unsigned flags);
1363
1364 extern void insert_breakpoints (void);
1365
1366 extern int remove_breakpoints (void);
1367
1368 extern int remove_breakpoints_pid (int pid);
1369
1370 /* This function can be used to update the breakpoint package's state
1371 after an exec() system call has been executed.
1372
1373 This function causes the following:
1374
1375 - All eventpoints are marked "not inserted".
1376 - All eventpoints with a symbolic address are reset such that
1377 the symbolic address must be reevaluated before the eventpoints
1378 can be reinserted.
1379 - The solib breakpoints are explicitly removed from the breakpoint
1380 list.
1381 - A step-resume breakpoint, if any, is explicitly removed from the
1382 breakpoint list.
1383 - All eventpoints without a symbolic address are removed from the
1384 breakpoint list. */
1385 extern void update_breakpoints_after_exec (void);
1386
1387 /* This function can be used to physically remove hardware breakpoints
1388 and watchpoints from the specified traced inferior process, without
1389 modifying the breakpoint package's state. This can be useful for
1390 those targets which support following the processes of a fork() or
1391 vfork() system call, when one of the resulting two processes is to
1392 be detached and allowed to run free.
1393
1394 It is an error to use this function on the process whose id is
1395 inferior_ptid. */
1396 extern int detach_breakpoints (ptid_t ptid);
1397
1398 /* This function is called when program space PSPACE is about to be
1399 deleted. It takes care of updating breakpoints to not reference
1400 this PSPACE anymore. */
1401 extern void breakpoint_program_space_exit (struct program_space *pspace);
1402
1403 extern void set_longjmp_breakpoint (struct thread_info *tp,
1404 struct frame_id frame);
1405 extern void delete_longjmp_breakpoint (int thread);
1406
1407 /* Mark all longjmp breakpoints from THREAD for later deletion. */
1408 extern void delete_longjmp_breakpoint_at_next_stop (int thread);
1409
1410 extern struct breakpoint *set_longjmp_breakpoint_for_call_dummy (void);
1411 extern void check_longjmp_breakpoint_for_call_dummy (struct thread_info *tp);
1412
1413 extern void enable_overlay_breakpoints (void);
1414 extern void disable_overlay_breakpoints (void);
1415
1416 extern void set_std_terminate_breakpoint (void);
1417 extern void delete_std_terminate_breakpoint (void);
1418
1419 /* These functions respectively disable or reenable all currently
1420 enabled watchpoints. When disabled, the watchpoints are marked
1421 call_disabled. When re-enabled, they are marked enabled.
1422
1423 The intended client of these functions is call_function_by_hand.
1424
1425 The inferior must be stopped, and all breakpoints removed, when
1426 these functions are used.
1427
1428 The need for these functions is that on some targets (e.g., HP-UX),
1429 gdb is unable to unwind through the dummy frame that is pushed as
1430 part of the implementation of a call command. Watchpoints can
1431 cause the inferior to stop in places where this frame is visible,
1432 and that can cause execution control to become very confused.
1433
1434 Note that if a user sets breakpoints in an interactively called
1435 function, the call_disabled watchpoints will have been re-enabled
1436 when the first such breakpoint is reached. However, on targets
1437 that are unable to unwind through the call dummy frame, watches
1438 of stack-based storage may then be deleted, because gdb will
1439 believe that their watched storage is out of scope. (Sigh.) */
1440 extern void disable_watchpoints_before_interactive_call_start (void);
1441
1442 extern void enable_watchpoints_after_interactive_call_stop (void);
1443
1444 /* These functions disable and re-enable all breakpoints during
1445 inferior startup. They are intended to be called from solib
1446 code where necessary. This is needed on platforms where the
1447 main executable is relocated at some point during startup
1448 processing, making breakpoint addresses invalid.
1449
1450 If additional breakpoints are created after the routine
1451 disable_breakpoints_before_startup but before the routine
1452 enable_breakpoints_after_startup was called, they will also
1453 be marked as disabled. */
1454 extern void disable_breakpoints_before_startup (void);
1455 extern void enable_breakpoints_after_startup (void);
1456
1457 /* For script interpreters that need to define breakpoint commands
1458 after they've already read the commands into a struct
1459 command_line. */
1460 extern enum command_control_type commands_from_control_command
1461 (const char *arg, struct command_line *cmd);
1462
1463 extern void clear_breakpoint_hit_counts (void);
1464
1465 extern struct breakpoint *get_breakpoint (int num);
1466
1467 /* The following are for displays, which aren't really breakpoints,
1468 but here is as good a place as any for them. */
1469
1470 extern void disable_current_display (void);
1471
1472 extern void do_displays (void);
1473
1474 extern void disable_display (int);
1475
1476 extern void clear_displays (void);
1477
1478 extern void disable_breakpoint (struct breakpoint *);
1479
1480 extern void enable_breakpoint (struct breakpoint *);
1481
1482 extern void breakpoint_set_commands (struct breakpoint *b,
1483 command_line_up &&commands);
1484
1485 extern void breakpoint_set_silent (struct breakpoint *b, int silent);
1486
1487 extern void breakpoint_set_thread (struct breakpoint *b, int thread);
1488
1489 extern void breakpoint_set_task (struct breakpoint *b, int task);
1490
1491 /* Clear the "inserted" flag in all breakpoints. */
1492 extern void mark_breakpoints_out (void);
1493
1494 extern struct breakpoint *create_jit_event_breakpoint (struct gdbarch *,
1495 CORE_ADDR);
1496
1497 extern struct breakpoint *create_solib_event_breakpoint (struct gdbarch *,
1498 CORE_ADDR);
1499
1500 /* Create an solib event breakpoint at ADDRESS in the current program
1501 space, and immediately try to insert it. Returns a pointer to the
1502 breakpoint on success. Deletes the new breakpoint and returns NULL
1503 if inserting the breakpoint fails. */
1504 extern struct breakpoint *create_and_insert_solib_event_breakpoint
1505 (struct gdbarch *gdbarch, CORE_ADDR address);
1506
1507 extern struct breakpoint *create_thread_event_breakpoint (struct gdbarch *,
1508 CORE_ADDR);
1509
1510 extern void remove_jit_event_breakpoints (void);
1511
1512 extern void remove_solib_event_breakpoints (void);
1513
1514 /* Mark solib event breakpoints of the current program space with
1515 delete at next stop disposition. */
1516 extern void remove_solib_event_breakpoints_at_next_stop (void);
1517
1518 extern void disable_breakpoints_in_shlibs (void);
1519
1520 /* This function returns TRUE if ep is a catchpoint. */
1521 extern int is_catchpoint (struct breakpoint *);
1522
1523 /* Shared helper function (MI and CLI) for creating and installing
1524 a shared object event catchpoint. */
1525 extern void add_solib_catchpoint (const char *arg, int is_load, int is_temp,
1526 int enabled);
1527
1528 /* Create and insert a new software single step breakpoint for the
1529 current thread. May be called multiple times; each time will add a
1530 new location to the set of potential addresses the next instruction
1531 is at. */
1532 extern void insert_single_step_breakpoint (struct gdbarch *,
1533 const address_space *,
1534 CORE_ADDR);
1535
1536 /* Insert all software single step breakpoints for the current frame.
1537 Return true if any software single step breakpoints are inserted,
1538 otherwise, return false. */
1539 extern int insert_single_step_breakpoints (struct gdbarch *);
1540
1541 /* Check if any hardware watchpoints have triggered, according to the
1542 target. */
1543 int watchpoints_triggered (struct target_waitstatus *);
1544
1545 /* Helper for transparent breakpoint hiding for memory read and write
1546 routines.
1547
1548 Update one of READBUF or WRITEBUF with either the shadows
1549 (READBUF), or the breakpoint instructions (WRITEBUF) of inserted
1550 breakpoints at the memory range defined by MEMADDR and extending
1551 for LEN bytes. If writing, then WRITEBUF is a copy of WRITEBUF_ORG
1552 on entry.*/
1553 extern void breakpoint_xfer_memory (gdb_byte *readbuf, gdb_byte *writebuf,
1554 const gdb_byte *writebuf_org,
1555 ULONGEST memaddr, LONGEST len);
1556
1557 /* Return true if breakpoints should be inserted now. That'll be the
1558 case if either:
1559
1560 - the target has global breakpoints.
1561
1562 - "breakpoint always-inserted" is on, and the target has
1563 execution.
1564
1565 - threads are executing.
1566 */
1567 extern int breakpoints_should_be_inserted_now (void);
1568
1569 /* Called each time new event from target is processed.
1570 Retires previously deleted breakpoint locations that
1571 in our opinion won't ever trigger. */
1572 extern void breakpoint_retire_moribund (void);
1573
1574 /* Set break condition of breakpoint B to EXP. */
1575 extern void set_breakpoint_condition (struct breakpoint *b, const char *exp,
1576 int from_tty);
1577
1578 /* Checks if we are catching syscalls or not.
1579 Returns 0 if not, greater than 0 if we are. */
1580 extern int catch_syscall_enabled (void);
1581
1582 /* Checks if we are catching syscalls with the specific
1583 syscall_number. Used for "filtering" the catchpoints.
1584 Returns 0 if not, greater than 0 if we are. */
1585 extern int catching_syscall_number (int syscall_number);
1586
1587 /* Return a tracepoint with the given number if found. */
1588 extern struct tracepoint *get_tracepoint (int num);
1589
1590 extern struct tracepoint *get_tracepoint_by_number_on_target (int num);
1591
1592 /* Find a tracepoint by parsing a number in the supplied string. */
1593 extern struct tracepoint *
1594 get_tracepoint_by_number (const char **arg,
1595 number_or_range_parser *parser);
1596
1597 /* Return a vector of all tracepoints currently defined. The vector
1598 is newly allocated; the caller should free when done with it. */
1599 extern VEC(breakpoint_p) *all_tracepoints (void);
1600
1601 extern int is_tracepoint (const struct breakpoint *b);
1602
1603 /* Return a vector of all static tracepoints defined at ADDR. The
1604 vector is newly allocated; the caller should free when done with
1605 it. */
1606 extern VEC(breakpoint_p) *static_tracepoints_here (CORE_ADDR addr);
1607
1608 /* Function that can be passed to read_command_line to validate
1609 that each command is suitable for tracepoint command list. */
1610 extern void check_tracepoint_command (char *line, void *closure);
1611
1612 /* Create an instance of this to start registering breakpoint numbers
1613 for a later "commands" command. */
1614
1615 class scoped_rbreak_breakpoints
1616 {
1617 public:
1618
1619 scoped_rbreak_breakpoints ();
1620 ~scoped_rbreak_breakpoints ();
1621
1622 DISABLE_COPY_AND_ASSIGN (scoped_rbreak_breakpoints);
1623 };
1624
1625 /* Breakpoint iterator function.
1626
1627 Calls a callback function once for each breakpoint, so long as the
1628 callback function returns false. If the callback function returns
1629 true, the iteration will end and the current breakpoint will be
1630 returned. This can be useful for implementing a search for a
1631 breakpoint with arbitrary attributes, or for applying an operation
1632 to every breakpoint. */
1633 extern struct breakpoint *iterate_over_breakpoints (int (*) (struct breakpoint *,
1634 void *), void *);
1635
1636 /* Nonzero if the specified PC cannot be a location where functions
1637 have been inlined. */
1638
1639 extern int pc_at_non_inline_function (const address_space *aspace,
1640 CORE_ADDR pc,
1641 const struct target_waitstatus *ws);
1642
1643 extern int user_breakpoint_p (struct breakpoint *);
1644
1645 /* Return true if this breakpoint is pending, false if not. */
1646 extern int pending_breakpoint_p (struct breakpoint *);
1647
1648 /* Attempt to determine architecture of location identified by SAL. */
1649 extern struct gdbarch *get_sal_arch (struct symtab_and_line sal);
1650
1651 extern void breakpoint_free_objfile (struct objfile *objfile);
1652
1653 extern const char *ep_parse_optional_if_clause (const char **arg);
1654
1655 /* Print the "Thread ID hit" part of "Thread ID hit Breakpoint N" to
1656 UIOUT iff debugging multiple threads. */
1657 extern void maybe_print_thread_hit_breakpoint (struct ui_out *uiout);
1658
1659 /* Print the specified breakpoint. */
1660 extern void print_breakpoint (breakpoint *bp);
1661
1662 #endif /* !defined (BREAKPOINT_H) */
gdbarch
Definition: gdbarch.c:127
scoped_rbreak_breakpoints
Definition: breakpoint.h:1615
bpstat_what
Definition: breakpoint.h:1003
bpstats::~bpstats
~bpstats()
Definition: breakpoint.c:4200
bp_target_info::reqstd_address
CORE_ADDR reqstd_address
Definition: breakpoint.h:251
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Definition: probe.h:112
command_line
Definition: cli-script.h:51
breakpoint_here_p
enum breakpoint_here breakpoint_here_p(const address_space *, CORE_ADDR)
Definition: breakpoint.c:3989
DEF_VEC_P
DEF_VEC_P(bp_location_p)
hardware_breakpoint_inserted_here_p
int hardware_breakpoint_inserted_here_p(const address_space *, CORE_ADDR)
Definition: breakpoint.c:4136
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void(* walk_bp_location_callback)(struct bp_location *, void *)
Definition: breakpoint.h:1252
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int input_radix
Definition: breakpoint.h:746
PRINT_SRC_AND_LOC
Definition: breakpoint.h:505
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bp_location * loc
Definition: breakpoint.h:702
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agent_expr_up cond_bytecode
Definition: breakpoint.h:355
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CORE_ADDR hw_wp_mask
Definition: breakpoint.h:845
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void(* print_recreate)(struct breakpoint *, struct ui_file *fp)
Definition: breakpoint.h:593
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Definition: breakpoint.h:300
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Definition: breakpoint.h:1151
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Definition: breakpoint.c:8507
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Definition: breakpoint.h:161
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int breakpoints_should_be_inserted_now(void)
Definition: breakpoint.c:391
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Definition: breakpoint.c:1512
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Definition: breakpoint.h:74
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Definition: breakpoint.c:13027
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Definition: breakpoint.c:14018
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Definition: breakpoint.h:202
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Definition: breakpoint.h:143
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Definition: breakpoint.c:7324
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std::unique_ptr< agent_expr > agent_expr_up
Definition: ax.h:159
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int length
Definition: breakpoint.h:432
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Definition: breakpoint.c:4156
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Definition: waitstatus.h:104
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struct command_line * breakpoint_commands(struct breakpoint *b)
Definition: breakpoint.c:303
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Definition: breakpoint.h:193
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Definition: breakpoint.c:4494
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Definition: breakpoint.c:9325
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Definition: common-types.h:41
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Definition: breakpoint.h:652
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Definition: breakpoint.h:164
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Definition: breakpoint.h:70
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target_hw_bp_type watchpoint_type
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Definition: breakpoint.h:994
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Definition: breakpoint.h:1230
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Definition: breakpoint.h:564
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Definition: expression.h:87
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Definition: breakpoint.h:991
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Definition: breakpoint.c:4212
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Definition: printcmd.c:2016
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mach_port_t mach_port_t name mach_port_t mach_port_t name kern_return_t int int rusage_t pid_t pid
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Definition: breakpoint.h:1154
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Definition: breakpoint.h:727
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Definition: breakpoint.h:187
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Definition: command.h:177
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Definition: breakpoint.h:220
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Definition: breakpoint.c:8241
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Definition: breakpoint.h:952
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Definition: remote-fileio.c:1104
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Definition: breakpoint.h:874
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Definition: breakpoint.h:910
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Definition: breakpoint.h:86
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Definition: breakpoint.h:568
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Definition: breakpoint.h:965
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Definition: breakpoint.h:97
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Definition: breakpoint.c:7227
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Definition: breakpoint.h:719
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Definition: breakpoint.c:4114
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Definition: breakpoint.h:708
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Definition: breakpoint.h:559
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Definition: breakpoint.c:1053
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Definition: breakpoint.h:312
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Definition: breakpoint.c:261
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Definition: breakpoint.h:699
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Definition: breakpoint.c:7560
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Definition: breakpoint.h:1099
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Definition: frame.c:575
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Definition: breakpoint.h:739
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Definition: breakpoint.h:706
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Definition: breakpoint.c:7520
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Definition: breakpoint.h:448
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Definition: breakpoint.h:308
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Definition: breakpoint.h:816
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Definition: breakpoint.h:501
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Definition: breakpoint.h:590
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Definition: breakpoint.c:1289
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Definition: breakpoint.h:421
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Definition: breakpoint.h:75
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Definition: breakpoint.c:1533
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Definition: printcmd.c:2028
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Definition: ui-file.h:26
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Definition: breakpoint.h:759
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Definition: breakpoint.h:72
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Definition: breakpoint.h:79
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Definition: breakpoint.h:1081
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Definition: breakpoint.h:440
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Definition: breakpoint.c:1219
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Definition: breakpoint.h:459
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Definition: breakpoint.h:372
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mach_port_t kern_return_t mach_port_t msgports mach_port_t kern_return_t pid_t pid mach_port_t kern_return_t mach_port_t task mach_port_t kern_return_t int flags
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Definition: breakpoint.c:2866
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Definition: breakpoint.h:238
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Definition: breakpoint.c:14330
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Definition: breakpoint.h:1072
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Definition: breakpoint.h:133
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Definition: breakpoint.h:533
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