1 /* Data structures associated with breakpoints in GDB.
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #if !defined (BREAKPOINT_H)
21 #define BREAKPOINT_H 1
29 struct breakpoint_object
;
31 /* This is the maximum number of bytes a breakpoint instruction can take.
32 Feel free to increase it. It's just used in a few places to size
33 arrays that should be independent of the target architecture. */
35 #define BREAKPOINT_MAX 16
38 /* Type of breakpoint. */
39 /* FIXME In the future, we should fold all other breakpoint-like things into
42 * single-step (for machines where we have to simulate single stepping)
43 (probably, though perhaps it is better for it to look as much as
44 possible like a single-step to wait_for_inferior). */
48 bp_none
= 0, /* Eventpoint has been deleted. */
49 bp_breakpoint
, /* Normal breakpoint */
50 bp_hardware_breakpoint
, /* Hardware assisted breakpoint */
51 bp_until
, /* used by until command */
52 bp_finish
, /* used by finish command */
53 bp_watchpoint
, /* Watchpoint */
54 bp_hardware_watchpoint
, /* Hardware assisted watchpoint */
55 bp_read_watchpoint
, /* read watchpoint, (hardware assisted) */
56 bp_access_watchpoint
, /* access watchpoint, (hardware assisted) */
57 bp_longjmp
, /* secret breakpoint to find longjmp() */
58 bp_longjmp_resume
, /* secret breakpoint to escape longjmp() */
60 /* Used by wait_for_inferior for stepping over subroutine calls, for
61 stepping over signal handlers, and for skipping prologues. */
64 /* Used to detect when a watchpoint expression has gone out of
65 scope. These breakpoints are usually not visible to the user.
67 This breakpoint has some interesting properties:
69 1) There's always a 1:1 mapping between watchpoints
70 on local variables and watchpoint_scope breakpoints.
72 2) It automatically deletes itself and the watchpoint it's
73 associated with when hit.
75 3) It can never be disabled. */
78 /* The breakpoint at the end of a call dummy. */
79 /* FIXME: What if the function we are calling longjmp()s out of the
80 call, or the user gets out with the "return" command? We currently
81 have no way of cleaning up the breakpoint in these (obscure) situations.
82 (Probably can solve this by noticing longjmp, "return", etc., it's
83 similar to noticing when a watchpoint on a local variable goes out
84 of scope (with hardware support for watchpoints)). */
87 /* A breakpoint set on std::terminate, that is used to catch
88 otherwise uncaught exceptions thrown during an inferior call. */
91 /* Some dynamic linkers (HP, maybe Solaris) can arrange for special
92 code in the inferior to run when significant events occur in the
93 dynamic linker (for example a library is loaded or unloaded).
95 By placing a breakpoint in this magic code GDB will get control
96 when these significant events occur. GDB can then re-examine
97 the dynamic linker's data structures to discover any newly loaded
101 /* Some multi-threaded systems can arrange for a location in the
102 inferior to be executed when certain thread-related events occur
103 (such as thread creation or thread death).
105 By placing a breakpoint at one of these locations, GDB will get
106 control when these events occur. GDB can then update its thread
111 /* On the same principal, an overlay manager can arrange to call a
112 magic location in the inferior whenever there is an interesting
113 change in overlay status. GDB can update its overlay tables
114 and fiddle with breakpoints in overlays when this breakpoint
119 /* Master copies of longjmp breakpoints. These are always installed
120 as soon as an objfile containing longjmp is loaded, but they are
121 always disabled. While necessary, temporary clones of bp_longjmp
122 type will be created and enabled. */
126 /* Master copies of std::terminate breakpoints. */
127 bp_std_terminate_master
,
133 bp_static_tracepoint
,
135 /* Event for JIT compiled code generation or deletion. */
139 /* States of enablement of breakpoint. */
143 bp_disabled
, /* The eventpoint is inactive, and cannot trigger. */
144 bp_enabled
, /* The eventpoint is active, and can trigger. */
145 bp_call_disabled
, /* The eventpoint has been disabled while a call
146 into the inferior is "in flight", because some
147 eventpoints interfere with the implementation of
148 a call on some targets. The eventpoint will be
149 automatically enabled and reset when the call
150 "lands" (either completes, or stops at another
152 bp_startup_disabled
,/* The eventpoint has been disabled during inferior
153 startup. This is necessary on some targets where
154 the main executable will get relocated during
155 startup, making breakpoint addresses invalid.
156 The eventpoint will be automatically enabled and
157 reset once inferior startup is complete. */
158 bp_permanent
/* There is a breakpoint instruction hard-wired into
159 the target's code. Don't try to write another
160 breakpoint instruction on top of it, or restore
161 its value. Step over it using the architecture's
166 /* Disposition of breakpoint. Ie: what to do after hitting it. */
170 disp_del
, /* Delete it */
171 disp_del_at_next_stop
, /* Delete at next stop, whether hit or not */
172 disp_disable
, /* Disable it */
173 disp_donttouch
/* Leave it alone */
176 enum target_hw_bp_type
178 hw_write
= 0, /* Common HW watchpoint */
179 hw_read
= 1, /* Read HW watchpoint */
180 hw_access
= 2, /* Access HW watchpoint */
181 hw_execute
= 3 /* Execute HW breakpoint */
185 /* Information used by targets to insert and remove breakpoints. */
187 struct bp_target_info
189 /* Address space at which the breakpoint was placed. */
190 struct address_space
*placed_address_space
;
192 /* Address at which the breakpoint was placed. This is normally the
193 same as ADDRESS from the bp_location, except when adjustment
194 happens in gdbarch_breakpoint_from_pc. The most common form of
195 adjustment is stripping an alternate ISA marker from the PC which
196 is used to determine the type of breakpoint to insert. */
197 CORE_ADDR placed_address
;
199 /* If the breakpoint lives in memory and reading that memory would
200 give back the breakpoint, instead of the original contents, then
201 the original contents are cached here. Only SHADOW_LEN bytes of
202 this buffer are valid, and only when the breakpoint is inserted. */
203 gdb_byte shadow_contents
[BREAKPOINT_MAX
];
205 /* The length of the data cached in SHADOW_CONTENTS. */
208 /* The size of the placed breakpoint, according to
209 gdbarch_breakpoint_from_pc, when the breakpoint was inserted. This is
210 generally the same as SHADOW_LEN, unless we did not need
211 to read from the target to implement the memory breakpoint
212 (e.g. if a remote stub handled the details). We may still
213 need the size to remove the breakpoint safely. */
217 /* GDB maintains two types of information about each breakpoint (or
218 watchpoint, or other related event). The first type corresponds
219 to struct breakpoint; this is a relatively high-level structure
220 which contains the source location(s), stopping conditions, user
221 commands to execute when the breakpoint is hit, and so forth.
223 The second type of information corresponds to struct bp_location.
224 Each breakpoint has one or (eventually) more locations associated
225 with it, which represent target-specific and machine-specific
226 mechanisms for stopping the program. For instance, a watchpoint
227 expression may require multiple hardware watchpoints in order to
228 catch all changes in the value of the expression being watched. */
232 bp_loc_software_breakpoint
,
233 bp_loc_hardware_breakpoint
,
234 bp_loc_hardware_watchpoint
,
235 bp_loc_other
/* Miscellaneous... */
240 /* Chain pointer to the next breakpoint location for
241 the same parent breakpoint. */
242 struct bp_location
*next
;
244 /* The reference count. */
247 /* Type of this breakpoint location. */
248 enum bp_loc_type loc_type
;
250 /* Each breakpoint location must belong to exactly one higher-level
251 breakpoint. This pointer is NULL iff this bp_location is no
252 longer attached to a breakpoint. For example, when a breakpoint
253 is deleted, its locations may still be found in the
254 moribund_locations list, or if we had stopped for it, in
256 struct breakpoint
*owner
;
258 /* Conditional. Break only if this expression's value is nonzero.
259 Unlike string form of condition, which is associated with
260 breakpoint, this is associated with location, since if breakpoint
261 has several locations, the evaluation of expression can be
262 different for different locations. Only valid for real
263 breakpoints; a watchpoint's conditional expression is stored in
264 the owner breakpoint object. */
265 struct expression
*cond
;
267 /* This location's address is in an unloaded solib, and so this
268 location should not be inserted. It will be automatically
269 enabled when that solib is loaded. */
272 /* Is this particular location enabled. */
275 /* Nonzero if this breakpoint is now inserted. */
278 /* Nonzero if this is not the first breakpoint in the list
279 for the given address. */
282 /* If we someday support real thread-specific breakpoints, then
283 the breakpoint location will need a thread identifier. */
285 /* Data for specific breakpoint types. These could be a union, but
286 simplicity is more important than memory usage for breakpoints. */
288 /* Architecture associated with this location's address. May be
289 different from the breakpoint architecture. */
290 struct gdbarch
*gdbarch
;
292 /* The program space associated with this breakpoint location
293 address. Note that an address space may be represented in more
294 than one program space (e.g. each uClinux program will be given
295 its own program space, but there will only be one address space
296 for all of them), but we must not insert more than one location
297 at the same address in the same address space. */
298 struct program_space
*pspace
;
300 /* Note that zero is a perfectly valid code address on some platforms
301 (for example, the mn10200 (OBSOLETE) and mn10300 simulators). NULL
302 is not a special value for this field. Valid for all types except
306 /* For hardware watchpoints, the size of data ad ADDRESS being watches. */
309 /* Type of hardware watchpoint. */
310 enum target_hw_bp_type watchpoint_type
;
312 /* For any breakpoint type with an address, this is the section
313 associated with the address. Used primarily for overlay debugging. */
314 struct obj_section
*section
;
316 /* Address at which breakpoint was requested, either by the user or
317 by GDB for internal breakpoints. This will usually be the same
318 as ``address'' (above) except for cases in which
319 ADJUST_BREAKPOINT_ADDRESS has computed a different address at
320 which to place the breakpoint in order to comply with a
321 processor's architectual constraints. */
322 CORE_ADDR requested_address
;
326 /* Details of the placed breakpoint, when inserted. */
327 struct bp_target_info target_info
;
329 /* Similarly, for the breakpoint at an overlay's LMA, if necessary. */
330 struct bp_target_info overlay_target_info
;
332 /* In a non-stop mode, it's possible that we delete a breakpoint,
333 but as we do that, some still running thread hits that breakpoint.
334 For that reason, we need to keep locations belonging to deleted
335 breakpoints for a bit, so that don't report unexpected SIGTRAP.
336 We can't keep such locations forever, so we use a heuristic --
337 after we process certain number of inferior events since
338 breakpoint was deleted, we retire all locations of that breakpoint.
339 This variable keeps a number of events still to go, when
340 it becomes 0 this location is retired. */
341 int events_till_retirement
;
344 /* This structure is a collection of function pointers that, if available,
345 will be called instead of the performing the default action for this
348 struct breakpoint_ops
350 /* Insert the breakpoint or activate the catchpoint. Should raise
351 an exception if the operation failed. */
352 void (*insert
) (struct breakpoint
*);
354 /* Remove the breakpoint/catchpoint that was previously inserted
355 with the "insert" method above. Return non-zero if the operation
357 int (*remove
) (struct breakpoint
*);
359 /* Return non-zero if the debugger should tell the user that this
360 breakpoint was hit. */
361 int (*breakpoint_hit
) (struct breakpoint
*);
363 /* The normal print routine for this breakpoint, called when we
365 enum print_stop_action (*print_it
) (struct breakpoint
*);
367 /* Display information about this breakpoint, for "info breakpoints". */
368 void (*print_one
) (struct breakpoint
*, struct bp_location
**);
370 /* Display information about this breakpoint after setting it (roughly
371 speaking; this is called from "mention"). */
372 void (*print_mention
) (struct breakpoint
*);
374 /* Print to FP the CLI command that recreates this breakpoint. */
375 void (*print_recreate
) (struct breakpoint
*, struct ui_file
*fp
);
378 enum watchpoint_triggered
380 /* This watchpoint definitely did not trigger. */
381 watch_triggered_no
= 0,
383 /* Some hardware watchpoint triggered, and it might have been this
384 one, but we do not know which it was. */
385 watch_triggered_unknown
,
387 /* This hardware watchpoint definitely did trigger. */
391 /* This is used to declare the VEC syscalls_to_be_caught. */
394 typedef struct bp_location
*bp_location_p
;
395 DEF_VEC_P(bp_location_p
);
397 /* A reference-counted struct command_line. This lets multiple
398 breakpoints share a single command list. This is an implementation
399 detail to the breakpoints module. */
400 struct counted_command_line
;
402 /* Note that the ->silent field is not currently used by any commands
403 (though the code is in there if it was to be, and set_raw_breakpoint
404 does set it to 0). I implemented it because I thought it would be
405 useful for a hack I had to put in; I'm going to leave it in because
406 I can see how there might be times when it would indeed be useful */
408 /* This is for a breakpoint or a watchpoint. */
412 struct breakpoint
*next
;
413 /* Type of breakpoint. */
415 /* Zero means disabled; remember the info but don't break here. */
416 enum enable_state enable_state
;
417 /* What to do with this breakpoint after we hit it. */
418 enum bpdisp disposition
;
419 /* Number assigned to distinguish breakpoints. */
422 /* Location(s) associated with this high-level breakpoint. */
423 struct bp_location
*loc
;
425 /* Line number of this address. */
429 /* Source file name of this address. */
433 /* Non-zero means a silent breakpoint (don't print frame info
435 unsigned char silent
;
436 /* Number of stops at this breakpoint that should
437 be continued automatically before really stopping. */
439 /* Chain of command lines to execute when this breakpoint is hit. */
440 struct counted_command_line
*commands
;
441 /* Stack depth (address of frame). If nonzero, break only if fp
443 struct frame_id frame_id
;
445 /* The program space used to set the breakpoint. */
446 struct program_space
*pspace
;
448 /* String we used to set the breakpoint (malloc'd). */
450 /* Architecture we used to set the breakpoint. */
451 struct gdbarch
*gdbarch
;
452 /* Language we used to set the breakpoint. */
453 enum language language
;
454 /* Input radix we used to set the breakpoint. */
456 /* String form of the breakpoint condition (malloc'd), or NULL if there
459 /* String form of exp to use for displaying to the user (malloc'd), or
462 /* String form to use for reparsing of EXP (malloc'd) or NULL. */
463 char *exp_string_reparse
;
465 /* The expression we are watching, or NULL if not a watchpoint. */
466 struct expression
*exp
;
467 /* The largest block within which it is valid, or NULL if it is
468 valid anywhere (e.g. consists just of global symbols). */
469 struct block
*exp_valid_block
;
470 /* The conditional expression if any. NULL if not a watchpoint. */
471 struct expression
*cond_exp
;
472 /* The largest block within which it is valid, or NULL if it is
473 valid anywhere (e.g. consists just of global symbols). */
474 struct block
*cond_exp_valid_block
;
475 /* Value of the watchpoint the last time we checked it, or NULL
476 when we do not know the value yet or the value was not
477 readable. VAL is never lazy. */
479 /* Nonzero if VAL is valid. If VAL_VALID is set but VAL is NULL,
480 then an error occurred reading the value. */
483 /* Holds the address of the related watchpoint_scope breakpoint
484 when using watchpoints on local variables (might the concept
485 of a related breakpoint be useful elsewhere, if not just call
486 it the watchpoint_scope breakpoint or something like that. FIXME). */
487 struct breakpoint
*related_breakpoint
;
489 /* Holds the frame address which identifies the frame this
490 watchpoint should be evaluated in, or `null' if the watchpoint
491 should be evaluated on the outermost frame. */
492 struct frame_id watchpoint_frame
;
494 /* Holds the thread which identifies the frame this watchpoint
495 should be considered in scope for, or `null_ptid' if the
496 watchpoint should be evaluated in all threads. */
497 ptid_t watchpoint_thread
;
499 /* For hardware watchpoints, the triggered status according to the
501 enum watchpoint_triggered watchpoint_triggered
;
503 /* Thread number for thread-specific breakpoint, or -1 if don't care. */
506 /* Ada task number for task-specific breakpoint, or 0 if don't care. */
509 /* Count of the number of times this breakpoint was taken, dumped
510 with the info, but not used for anything else. Useful for
511 seeing how many times you hit a break prior to the program
512 aborting, so you can back up to just before the abort. */
515 /* Process id of a child process whose forking triggered this
516 catchpoint. This field is only valid immediately after this
517 catchpoint has triggered. */
518 ptid_t forked_inferior_pid
;
520 /* Filename of a program whose exec triggered this catchpoint.
521 This field is only valid immediately after this catchpoint has
525 /* Syscall numbers used for the 'catch syscall' feature.
526 If no syscall has been specified for filtering, its value is NULL.
527 Otherwise, it holds a list of all syscalls to be caught.
528 The list elements are allocated with xmalloc. */
529 VEC(int) *syscalls_to_be_caught
;
531 /* Methods associated with this breakpoint. */
532 struct breakpoint_ops
*ops
;
534 /* Is breakpoint's condition not yet parsed because we found
535 no location initially so had no context to parse
537 int condition_not_parsed
;
539 /* Number of times this tracepoint should single-step
540 and collect additional data. */
543 /* Number of times this tracepoint should be hit before
547 /* The number of the tracepoint on the target. */
548 int number_on_target
;
550 /* The static tracepoint marker id, if known. */
551 char *static_trace_marker_id
;
553 /* LTTng/UST allow more than one marker with the same ID string,
554 although it unadvised because it confuses tools. When setting
555 static tracepoints by marker ID, this will record the index in
556 the array of markers we found for the given marker ID for which
557 this static tracepoint corresponds. When resetting
558 breakpoints, we will use this index to try to find the same
560 int static_trace_marker_id_idx
;
562 /* With a Python scripting enabled GDB, store a reference to the
563 Python object that has been associated with this breakpoint.
564 This is always NULL for a GDB that is not script enabled. It
565 can sometimes be NULL for enabled GDBs as not all breakpoint
566 types are tracked by the Python scripting API. */
567 struct breakpoint_object
*py_bp_object
;
570 typedef struct breakpoint
*breakpoint_p
;
571 DEF_VEC_P(breakpoint_p
);
573 /* The following stuff is an abstract data type "bpstat" ("breakpoint
574 status"). This provides the ability to determine whether we have
575 stopped at a breakpoint, and what we should do about it. */
577 typedef struct bpstats
*bpstat
;
579 /* Clears a chain of bpstat, freeing storage
581 extern void bpstat_clear (bpstat
*);
583 /* Return a copy of a bpstat. Like "bs1 = bs2" but all storage that
584 is part of the bpstat is copied as well. */
585 extern bpstat
bpstat_copy (bpstat
);
587 extern bpstat
bpstat_stop_status (struct address_space
*aspace
,
588 CORE_ADDR pc
, ptid_t ptid
);
590 /* This bpstat_what stuff tells wait_for_inferior what to do with a
591 breakpoint (a challenging task).
593 The enum values order defines priority-like order of the actions.
594 Once you've decided that some action is appropriate, you'll never
595 go back and decide something of a lower priority is better. Each
596 of these actions is mutually exclusive with the others. That
597 means, that if you find yourself adding a new action class here and
598 wanting to tell GDB that you have two simultaneous actions to
599 handle, something is wrong, and you probably don't actually need a
602 Note that a step resume breakpoint overrides another breakpoint of
603 signal handling (see comment in wait_for_inferior at where we set
604 the step_resume breakpoint). */
606 enum bpstat_what_main_action
608 /* Perform various other tests; that is, this bpstat does not
609 say to perform any action (e.g. failed watchpoint and nothing
611 BPSTAT_WHAT_KEEP_CHECKING
,
613 /* Remove breakpoints, single step once, then put them back in and
614 go back to what we were doing. It's possible that this should be
615 removed from the main_action and put into a separate field, to more
616 cleanly handle BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE. */
619 /* Set longjmp_resume breakpoint, remove all other breakpoints,
620 and continue. The "remove all other breakpoints" part is required
621 if we are also stepping over another breakpoint as well as doing
622 the longjmp handling. */
623 BPSTAT_WHAT_SET_LONGJMP_RESUME
,
625 /* Clear longjmp_resume breakpoint, then handle as
626 BPSTAT_WHAT_KEEP_CHECKING. */
627 BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
,
629 /* Rather than distinguish between noisy and silent stops here, it
630 might be cleaner to have bpstat_print make that decision (also
631 taking into account stop_print_frame and source_only). But the
632 implications are a bit scary (interaction with auto-displays, etc.),
633 so I won't try it. */
636 BPSTAT_WHAT_STOP_SILENT
,
638 /* Stop and print. */
639 BPSTAT_WHAT_STOP_NOISY
,
641 /* Clear step resume breakpoint, and keep checking. */
642 BPSTAT_WHAT_STEP_RESUME
,
645 /* An enum indicating the kind of "stack dummy" stop. This is a bit
646 of a misnomer because only one kind of truly a stack dummy. */
649 /* We didn't stop at a stack dummy breakpoint. */
652 /* Stopped at a stack dummy. */
655 /* Stopped at std::terminate. */
661 enum bpstat_what_main_action main_action
;
663 /* Did we hit a call dummy breakpoint? This only goes with a main_action
664 of BPSTAT_WHAT_STOP_SILENT or BPSTAT_WHAT_STOP_NOISY (the concept of
665 continuing from a call dummy without popping the frame is not a
667 enum stop_stack_kind call_dummy
;
670 /* The possible return values for print_bpstat, print_it_normal,
671 print_it_done, print_it_noop. */
672 enum print_stop_action
680 /* Tell what to do about this bpstat. */
681 struct bpstat_what
bpstat_what (bpstat
);
683 /* Find the bpstat associated with a breakpoint. NULL otherwise. */
684 bpstat
bpstat_find_breakpoint (bpstat
, struct breakpoint
*);
686 /* Nonzero if a signal that we got in wait() was due to circumstances
687 explained by the BS. */
688 /* Currently that is true if we have hit a breakpoint, or if there is
689 a watchpoint enabled. */
690 #define bpstat_explains_signal(bs) ((bs) != NULL)
692 /* Nonzero is this bpstat causes a stop. */
693 extern int bpstat_causes_stop (bpstat
);
695 /* Nonzero if we should step constantly (e.g. watchpoints on machines
696 without hardware support). This isn't related to a specific bpstat,
697 just to things like whether watchpoints are set. */
698 extern int bpstat_should_step (void);
700 /* Print a message indicating what happened. Returns nonzero to
701 say that only the source line should be printed after this (zero
702 return means print the frame as well as the source line). */
703 extern enum print_stop_action
bpstat_print (bpstat
);
705 /* Put in *NUM the breakpoint number of the first breakpoint we are stopped
706 at. *BSP upon return is a bpstat which points to the remaining
707 breakpoints stopped at (but which is not guaranteed to be good for
708 anything but further calls to bpstat_num).
709 Return 0 if passed a bpstat which does not indicate any breakpoints.
710 Return -1 if stopped at a breakpoint that has been deleted since
712 Return 1 otherwise. */
713 extern int bpstat_num (bpstat
*, int *);
715 /* Perform actions associated with the stopped inferior. Actually, we
716 just use this for breakpoint commands. Perhaps other actions will
717 go here later, but this is executed at a late time (from the
719 extern void bpstat_do_actions (void);
721 /* Modify BS so that the actions will not be performed. */
722 extern void bpstat_clear_actions (bpstat
);
724 /* Implementation: */
726 /* Values used to tell the printing routine how to behave for this bpstat. */
729 /* This is used when we want to do a normal printing of the reason
730 for stopping. The output will depend on the type of eventpoint
731 we are dealing with. This is the default value, most commonly
734 /* This is used when nothing should be printed for this bpstat entry. */
736 /* This is used when everything which needs to be printed has
737 already been printed. But we still want to print the frame. */
743 /* Linked list because there can be more than one breakpoint at
744 the same place, and a bpstat reflects the fact that all have
748 /* Location that caused the stop. Locations are refcounted, so
749 this will never be NULL. Note that this location may end up
750 detached from a breakpoint, but that does not necessary mean
751 that the struct breakpoint is gone. E.g., consider a
752 watchpoint with a condition that involves an inferior function
753 call. Watchpoint locations are recreated often (on resumes,
754 hence on infcalls too). Between creating the bpstat and after
755 evaluating the watchpoint condition, this location may hence
756 end up detached from its original owner watchpoint, even though
757 the watchpoint is still listed. If it's condition evaluates as
758 true, we still want this location to cause a stop, and we will
759 still need to know which watchpoint it was originally attached.
760 What this means is that we should not (in most cases) follow
761 the `bpstat->bp_location->owner' link, but instead use the
762 `breakpoint_at' field below. */
763 struct bp_location
*bp_location_at
;
765 /* Breakpoint that caused the stop. This is nullified if the
766 breakpoint ends up being deleted. See comments on
767 `bp_location_at' above for why do we need this field instead of
768 following the location's owner. */
769 struct breakpoint
*breakpoint_at
;
771 /* The associated command list. */
772 struct counted_command_line
*commands
;
774 /* Commands left to be done. This points somewhere in
776 struct command_line
*commands_left
;
778 /* Old value associated with a watchpoint. */
779 struct value
*old_val
;
781 /* Nonzero if this breakpoint tells us to print the frame. */
784 /* Nonzero if this breakpoint tells us to stop. */
787 /* Tell bpstat_print and print_bp_stop_message how to print stuff
788 associated with this element of the bpstat chain. */
789 enum bp_print_how print_it
;
800 /* The possible return values for breakpoint_here_p.
801 We guarantee that zero always means "no breakpoint here". */
804 no_breakpoint_here
= 0,
805 ordinary_breakpoint_here
,
806 permanent_breakpoint_here
810 /* Prototypes for breakpoint-related functions. */
812 extern enum breakpoint_here
breakpoint_here_p (struct address_space
*, CORE_ADDR
);
814 extern int moribund_breakpoint_here_p (struct address_space
*, CORE_ADDR
);
816 extern int breakpoint_inserted_here_p (struct address_space
*, CORE_ADDR
);
818 extern int regular_breakpoint_inserted_here_p (struct address_space
*, CORE_ADDR
);
820 extern int software_breakpoint_inserted_here_p (struct address_space
*, CORE_ADDR
);
822 /* Returns true if there's a hardware watchpoint or access watchpoint
823 inserted in the range defined by ADDR and LEN. */
824 extern int hardware_watchpoint_inserted_in_range (struct address_space
*,
828 extern int breakpoint_thread_match (struct address_space
*, CORE_ADDR
, ptid_t
);
830 extern void until_break_command (char *, int, int);
832 extern void breakpoint_re_set (void);
834 extern void breakpoint_re_set_thread (struct breakpoint
*);
836 extern struct breakpoint
*set_momentary_breakpoint
837 (struct gdbarch
*, struct symtab_and_line
, struct frame_id
, enum bptype
);
839 extern struct breakpoint
*set_momentary_breakpoint_at_pc
840 (struct gdbarch
*, CORE_ADDR pc
, enum bptype type
);
842 extern struct breakpoint
*clone_momentary_breakpoint (struct breakpoint
*bpkt
);
844 extern void set_ignore_count (int, int, int);
846 extern void set_default_breakpoint (int, struct program_space
*,
847 CORE_ADDR
, struct symtab
*, int);
849 extern void breakpoint_init_inferior (enum inf_context
);
851 extern struct cleanup
*make_cleanup_delete_breakpoint (struct breakpoint
*);
853 extern void delete_breakpoint (struct breakpoint
*);
855 extern void breakpoint_auto_delete (bpstat
);
857 /* Return the chain of command lines to execute when this breakpoint
859 extern struct command_line
*breakpoint_commands (struct breakpoint
*b
);
861 extern void break_command (char *, int);
863 extern void hbreak_command_wrapper (char *, int);
864 extern void thbreak_command_wrapper (char *, int);
865 extern void rbreak_command_wrapper (char *, int);
866 extern void watch_command_wrapper (char *, int, int);
867 extern void awatch_command_wrapper (char *, int, int);
868 extern void rwatch_command_wrapper (char *, int, int);
869 extern void tbreak_command (char *, int);
871 extern int create_breakpoint (struct gdbarch
*gdbarch
, char *arg
,
872 char *cond_string
, int thread
,
873 int parse_condition_and_thread
,
874 int tempflag
, enum bptype wanted_type
,
876 enum auto_boolean pending_break_support
,
877 struct breakpoint_ops
*ops
,
882 extern void insert_breakpoints (void);
884 extern int remove_breakpoints (void);
886 extern int remove_breakpoints_pid (int pid
);
888 /* This function can be used to physically insert eventpoints from the
889 specified traced inferior process, without modifying the breakpoint
890 package's state. This can be useful for those targets which support
891 following the processes of a fork() or vfork() system call, when both
892 of the resulting two processes are to be followed. */
893 extern int reattach_breakpoints (int);
895 /* This function can be used to update the breakpoint package's state
896 after an exec() system call has been executed.
898 This function causes the following:
900 - All eventpoints are marked "not inserted".
901 - All eventpoints with a symbolic address are reset such that
902 the symbolic address must be reevaluated before the eventpoints
904 - The solib breakpoints are explicitly removed from the breakpoint
906 - A step-resume breakpoint, if any, is explicitly removed from the
908 - All eventpoints without a symbolic address are removed from the
910 extern void update_breakpoints_after_exec (void);
912 /* This function can be used to physically remove hardware breakpoints
913 and watchpoints from the specified traced inferior process, without
914 modifying the breakpoint package's state. This can be useful for
915 those targets which support following the processes of a fork() or
916 vfork() system call, when one of the resulting two processes is to
917 be detached and allowed to run free.
919 It is an error to use this function on the process whose id is
921 extern int detach_breakpoints (int);
923 /* This function is called when program space PSPACE is about to be
924 deleted. It takes care of updating breakpoints to not reference
925 this PSPACE anymore. */
926 extern void breakpoint_program_space_exit (struct program_space
*pspace
);
928 extern void set_longjmp_breakpoint (int thread
);
929 extern void delete_longjmp_breakpoint (int thread
);
931 extern void enable_overlay_breakpoints (void);
932 extern void disable_overlay_breakpoints (void);
934 extern void set_std_terminate_breakpoint (void);
935 extern void delete_std_terminate_breakpoint (void);
937 /* These functions respectively disable or reenable all currently
938 enabled watchpoints. When disabled, the watchpoints are marked
939 call_disabled. When reenabled, they are marked enabled.
941 The intended client of these functions is call_function_by_hand.
943 The inferior must be stopped, and all breakpoints removed, when
944 these functions are used.
946 The need for these functions is that on some targets (e.g., HP-UX),
947 gdb is unable to unwind through the dummy frame that is pushed as
948 part of the implementation of a call command. Watchpoints can
949 cause the inferior to stop in places where this frame is visible,
950 and that can cause execution control to become very confused.
952 Note that if a user sets breakpoints in an interactively called
953 function, the call_disabled watchpoints will have been reenabled
954 when the first such breakpoint is reached. However, on targets
955 that are unable to unwind through the call dummy frame, watches
956 of stack-based storage may then be deleted, because gdb will
957 believe that their watched storage is out of scope. (Sigh.) */
958 extern void disable_watchpoints_before_interactive_call_start (void);
960 extern void enable_watchpoints_after_interactive_call_stop (void);
962 /* These functions disable and re-enable all breakpoints during
963 inferior startup. They are intended to be called from solib
964 code where necessary. This is needed on platforms where the
965 main executable is relocated at some point during startup
966 processing, making breakpoint addresses invalid.
968 If additional breakpoints are created after the routine
969 disable_breakpoints_before_startup but before the routine
970 enable_breakpoints_after_startup was called, they will also
971 be marked as disabled. */
972 extern void disable_breakpoints_before_startup (void);
973 extern void enable_breakpoints_after_startup (void);
975 /* For script interpreters that need to define breakpoint commands
976 after they've already read the commands into a struct command_line. */
977 extern enum command_control_type commands_from_control_command
978 (char *arg
, struct command_line
*cmd
);
980 extern void clear_breakpoint_hit_counts (void);
982 extern int get_number (char **);
984 extern int get_number_or_range (char **);
986 extern struct breakpoint
*get_breakpoint (int num
);
988 /* The following are for displays, which aren't really breakpoints, but
989 here is as good a place as any for them. */
991 extern void disable_current_display (void);
993 extern void do_displays (void);
995 extern void disable_display (int);
997 extern void clear_displays (void);
999 extern void disable_breakpoint (struct breakpoint
*);
1001 extern void enable_breakpoint (struct breakpoint
*);
1003 extern void breakpoint_set_commands (struct breakpoint
*b
,
1004 struct command_line
*commands
);
1006 /* Clear the "inserted" flag in all breakpoints. */
1007 extern void mark_breakpoints_out (void);
1009 extern void make_breakpoint_permanent (struct breakpoint
*);
1011 extern struct breakpoint
*create_jit_event_breakpoint (struct gdbarch
*,
1014 extern struct breakpoint
*create_solib_event_breakpoint (struct gdbarch
*,
1017 extern struct breakpoint
*create_thread_event_breakpoint (struct gdbarch
*,
1020 extern void remove_solib_event_breakpoints (void);
1022 extern void remove_thread_event_breakpoints (void);
1024 extern void disable_breakpoints_in_shlibs (void);
1026 /* This function returns TRUE if ep is a catchpoint. */
1027 extern int ep_is_catchpoint (struct breakpoint
*);
1029 /* Enable breakpoints and delete when hit. Called with ARG == NULL
1030 deletes all breakpoints. */
1031 extern void delete_command (char *arg
, int from_tty
);
1033 /* Pull all H/W watchpoints from the target. Return non-zero if the
1035 extern int remove_hw_watchpoints (void);
1037 /* Manage a software single step breakpoint (or two). Insert may be called
1038 twice before remove is called. */
1039 extern void insert_single_step_breakpoint (struct gdbarch
*,
1040 struct address_space
*, CORE_ADDR
);
1041 extern int single_step_breakpoints_inserted (void);
1042 extern void remove_single_step_breakpoints (void);
1043 extern void cancel_single_step_breakpoints (void);
1045 /* Manage manual breakpoints, separate from the normal chain of
1046 breakpoints. These functions are used in murky target-specific
1047 ways. Please do not add more uses! */
1048 extern void *deprecated_insert_raw_breakpoint (struct gdbarch
*,
1049 struct address_space
*, CORE_ADDR
);
1050 extern int deprecated_remove_raw_breakpoint (struct gdbarch
*, void *);
1052 /* Check if any hardware watchpoints have triggered, according to the
1054 int watchpoints_triggered (struct target_waitstatus
*);
1056 /* Update BUF, which is LEN bytes read from the target address MEMADDR,
1057 by replacing any memory breakpoints with their shadowed contents. */
1058 void breakpoint_restore_shadows (gdb_byte
*buf
, ULONGEST memaddr
,
1061 extern int breakpoints_always_inserted_mode (void);
1063 /* Called each time new event from target is processed.
1064 Retires previously deleted breakpoint locations that
1065 in our opinion won't ever trigger. */
1066 extern void breakpoint_retire_moribund (void);
1068 /* Set break condition of breakpoint B to EXP. */
1069 extern void set_breakpoint_condition (struct breakpoint
*b
, char *exp
,
1072 /* Checks if we are catching syscalls or not.
1073 Returns 0 if not, greater than 0 if we are. */
1074 extern int catch_syscall_enabled (void);
1076 /* Checks if we are catching syscalls with the specific
1077 syscall_number. Used for "filtering" the catchpoints.
1078 Returns 0 if not, greater than 0 if we are. */
1079 extern int catching_syscall_number (int syscall_number
);
1081 /* Tell a breakpoint to be quiet. */
1082 extern void make_breakpoint_silent (struct breakpoint
*);
1084 /* Return a tracepoint with the given number if found. */
1085 extern struct breakpoint
*get_tracepoint (int num
);
1087 extern struct breakpoint
*get_tracepoint_by_number_on_target (int num
);
1089 /* Find a tracepoint by parsing a number in the supplied string. */
1090 extern struct breakpoint
*get_tracepoint_by_number (char **arg
, int multi_p
,
1093 /* Return a vector of all tracepoints currently defined. The vector
1094 is newly allocated; the caller should free when done with it. */
1095 extern VEC(breakpoint_p
) *all_tracepoints (void);
1097 extern int is_tracepoint (const struct breakpoint
*b
);
1099 /* Return a vector of all static tracepoints defined at ADDR. The
1100 vector is newly allocated; the caller should free when done with
1102 extern VEC(breakpoint_p
) *static_tracepoints_here (CORE_ADDR addr
);
1104 /* Function that can be passed to read_command_line to validate
1105 that each command is suitable for tracepoint command list. */
1106 extern void check_tracepoint_command (char *line
, void *closure
);
1108 /* Call at the start and end of an "rbreak" command to register
1109 breakpoint numbers for a later "commands" command. */
1110 extern void start_rbreak_breakpoints (void);
1111 extern void end_rbreak_breakpoints (void);
1113 /* Breakpoint iterator function.
1115 Calls a callback function once for each breakpoint, so long as the
1116 callback function returns false. If the callback function returns
1117 true, the iteration will end and the current breakpoint will be
1118 returned. This can be useful for implementing a search for a
1119 breakpoint with arbitrary attributes, or for applying an operation
1120 to every breakpoint. */
1121 extern struct breakpoint
*iterate_over_breakpoints (int (*) (struct breakpoint
*,
1124 #endif /* !defined (BREAKPOINT_H) */