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, 2011
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #if !defined (BREAKPOINT_H)
22 #define BREAKPOINT_H 1
30 struct breakpoint_object
;
31 struct get_number_or_range_state
;
34 /* This is the maximum number of bytes a breakpoint instruction can
35 take. Feel free to increase it. It's just used in a few places to
36 size arrays that should be independent of the target
39 #define BREAKPOINT_MAX 16
42 /* Type of breakpoint. */
43 /* FIXME In the future, we should fold all other breakpoint-like
44 things into here. This includes:
46 * single-step (for machines where we have to simulate single
47 stepping) (probably, though perhaps it is better for it to look as
48 much as possible like a single-step to wait_for_inferior). */
52 bp_none
= 0, /* Eventpoint has been deleted */
53 bp_breakpoint
, /* Normal breakpoint */
54 bp_hardware_breakpoint
, /* Hardware assisted breakpoint */
55 bp_until
, /* used by until command */
56 bp_finish
, /* used by finish command */
57 bp_watchpoint
, /* Watchpoint */
58 bp_hardware_watchpoint
, /* Hardware assisted watchpoint */
59 bp_read_watchpoint
, /* read watchpoint, (hardware assisted) */
60 bp_access_watchpoint
, /* access watchpoint, (hardware assisted) */
61 bp_longjmp
, /* secret breakpoint to find longjmp() */
62 bp_longjmp_resume
, /* secret breakpoint to escape longjmp() */
64 /* An internal breakpoint that is installed on the unwinder's
67 /* An internal breakpoint that is set at the point where an
68 exception will land. */
71 /* Used by wait_for_inferior for stepping over subroutine calls,
72 and for skipping prologues. */
75 /* Used by wait_for_inferior for stepping over signal
79 /* Used to detect when a watchpoint expression has gone out of
80 scope. These breakpoints are usually not visible to the user.
82 This breakpoint has some interesting properties:
84 1) There's always a 1:1 mapping between watchpoints
85 on local variables and watchpoint_scope breakpoints.
87 2) It automatically deletes itself and the watchpoint it's
88 associated with when hit.
90 3) It can never be disabled. */
93 /* The breakpoint at the end of a call dummy. */
94 /* FIXME: What if the function we are calling longjmp()s out of
95 the call, or the user gets out with the "return" command? We
96 currently have no way of cleaning up the breakpoint in these
97 (obscure) situations. (Probably can solve this by noticing
98 longjmp, "return", etc., it's similar to noticing when a
99 watchpoint on a local variable goes out of scope (with hardware
100 support for watchpoints)). */
103 /* A breakpoint set on std::terminate, that is used to catch
104 otherwise uncaught exceptions thrown during an inferior call. */
107 /* Some dynamic linkers (HP, maybe Solaris) can arrange for special
108 code in the inferior to run when significant events occur in the
109 dynamic linker (for example a library is loaded or unloaded).
111 By placing a breakpoint in this magic code GDB will get control
112 when these significant events occur. GDB can then re-examine
113 the dynamic linker's data structures to discover any newly loaded
114 dynamic libraries. */
117 /* Some multi-threaded systems can arrange for a location in the
118 inferior to be executed when certain thread-related events occur
119 (such as thread creation or thread death).
121 By placing a breakpoint at one of these locations, GDB will get
122 control when these events occur. GDB can then update its thread
127 /* On the same principal, an overlay manager can arrange to call a
128 magic location in the inferior whenever there is an interesting
129 change in overlay status. GDB can update its overlay tables
130 and fiddle with breakpoints in overlays when this breakpoint
135 /* Master copies of longjmp breakpoints. These are always installed
136 as soon as an objfile containing longjmp is loaded, but they are
137 always disabled. While necessary, temporary clones of bp_longjmp
138 type will be created and enabled. */
142 /* Master copies of std::terminate breakpoints. */
143 bp_std_terminate_master
,
145 /* Like bp_longjmp_master, but for exceptions. */
152 bp_static_tracepoint
,
154 /* Event for JIT compiled code generation or deletion. */
157 /* Breakpoint is placed at the STT_GNU_IFUNC resolver. When hit GDB
158 inserts new bp_gnu_ifunc_resolver_return at the caller.
159 bp_gnu_ifunc_resolver is still being kept here as a different thread
160 may still hit it before bp_gnu_ifunc_resolver_return is hit by the
162 bp_gnu_ifunc_resolver
,
164 /* On its hit GDB now know the resolved address of the target
165 STT_GNU_IFUNC function. Associated bp_gnu_ifunc_resolver can be
166 deleted now and the breakpoint moved to the target function entry
168 bp_gnu_ifunc_resolver_return
,
171 /* States of enablement of breakpoint. */
175 bp_disabled
, /* The eventpoint is inactive, and cannot
177 bp_enabled
, /* The eventpoint is active, and can
179 bp_call_disabled
, /* The eventpoint has been disabled while a
180 call into the inferior is "in flight",
181 because some eventpoints interfere with
182 the implementation of a call on some
183 targets. The eventpoint will be
184 automatically enabled and reset when the
185 call "lands" (either completes, or stops
186 at another eventpoint). */
187 bp_startup_disabled
, /* The eventpoint has been disabled during
188 inferior startup. This is necessary on
189 some targets where the main executable
190 will get relocated during startup, making
191 breakpoint addresses invalid. The
192 eventpoint will be automatically enabled
193 and reset once inferior startup is
195 bp_permanent
/* There is a breakpoint instruction
196 hard-wired into the target's code. Don't
197 try to write another breakpoint
198 instruction on top of it, or restore its
199 value. Step over it using the
200 architecture's SKIP_INSN macro. */
204 /* Disposition of breakpoint. Ie: what to do after hitting it. */
208 disp_del
, /* Delete it */
209 disp_del_at_next_stop
, /* Delete at next stop,
210 whether hit or not */
211 disp_disable
, /* Disable it */
212 disp_donttouch
/* Leave it alone */
215 enum target_hw_bp_type
217 hw_write
= 0, /* Common HW watchpoint */
218 hw_read
= 1, /* Read HW watchpoint */
219 hw_access
= 2, /* Access HW watchpoint */
220 hw_execute
= 3 /* Execute HW breakpoint */
224 /* Information used by targets to insert and remove breakpoints. */
226 struct bp_target_info
228 /* Address space at which the breakpoint was placed. */
229 struct address_space
*placed_address_space
;
231 /* Address at which the breakpoint was placed. This is normally the
232 same as ADDRESS from the bp_location, except when adjustment
233 happens in gdbarch_breakpoint_from_pc. The most common form of
234 adjustment is stripping an alternate ISA marker from the PC which
235 is used to determine the type of breakpoint to insert. */
236 CORE_ADDR placed_address
;
238 /* If this is a ranged breakpoint, then this field contains the
239 length of the range that will be watched for execution. */
242 /* If the breakpoint lives in memory and reading that memory would
243 give back the breakpoint, instead of the original contents, then
244 the original contents are cached here. Only SHADOW_LEN bytes of
245 this buffer are valid, and only when the breakpoint is inserted. */
246 gdb_byte shadow_contents
[BREAKPOINT_MAX
];
248 /* The length of the data cached in SHADOW_CONTENTS. */
251 /* The size of the placed breakpoint, according to
252 gdbarch_breakpoint_from_pc, when the breakpoint was inserted.
253 This is generally the same as SHADOW_LEN, unless we did not need
254 to read from the target to implement the memory breakpoint
255 (e.g. if a remote stub handled the details). We may still need
256 the size to remove the breakpoint safely. */
260 /* GDB maintains two types of information about each breakpoint (or
261 watchpoint, or other related event). The first type corresponds
262 to struct breakpoint; this is a relatively high-level structure
263 which contains the source location(s), stopping conditions, user
264 commands to execute when the breakpoint is hit, and so forth.
266 The second type of information corresponds to struct bp_location.
267 Each breakpoint has one or (eventually) more locations associated
268 with it, which represent target-specific and machine-specific
269 mechanisms for stopping the program. For instance, a watchpoint
270 expression may require multiple hardware watchpoints in order to
271 catch all changes in the value of the expression being watched. */
275 bp_loc_software_breakpoint
,
276 bp_loc_hardware_breakpoint
,
277 bp_loc_hardware_watchpoint
,
278 bp_loc_other
/* Miscellaneous... */
283 /* Chain pointer to the next breakpoint location for
284 the same parent breakpoint. */
285 struct bp_location
*next
;
287 /* The reference count. */
290 /* Type of this breakpoint location. */
291 enum bp_loc_type loc_type
;
293 /* Each breakpoint location must belong to exactly one higher-level
294 breakpoint. This pointer is NULL iff this bp_location is no
295 longer attached to a breakpoint. For example, when a breakpoint
296 is deleted, its locations may still be found in the
297 moribund_locations list, or if we had stopped for it, in
299 struct breakpoint
*owner
;
301 /* Conditional. Break only if this expression's value is nonzero.
302 Unlike string form of condition, which is associated with
303 breakpoint, this is associated with location, since if breakpoint
304 has several locations, the evaluation of expression can be
305 different for different locations. Only valid for real
306 breakpoints; a watchpoint's conditional expression is stored in
307 the owner breakpoint object. */
308 struct expression
*cond
;
310 /* This location's address is in an unloaded solib, and so this
311 location should not be inserted. It will be automatically
312 enabled when that solib is loaded. */
315 /* Is this particular location enabled. */
318 /* Nonzero if this breakpoint is now inserted. */
321 /* Nonzero if this is not the first breakpoint in the list
322 for the given address. */
325 /* If we someday support real thread-specific breakpoints, then
326 the breakpoint location will need a thread identifier. */
328 /* Data for specific breakpoint types. These could be a union, but
329 simplicity is more important than memory usage for breakpoints. */
331 /* Architecture associated with this location's address. May be
332 different from the breakpoint architecture. */
333 struct gdbarch
*gdbarch
;
335 /* The program space associated with this breakpoint location
336 address. Note that an address space may be represented in more
337 than one program space (e.g. each uClinux program will be given
338 its own program space, but there will only be one address space
339 for all of them), but we must not insert more than one location
340 at the same address in the same address space. */
341 struct program_space
*pspace
;
343 /* Note that zero is a perfectly valid code address on some platforms
344 (for example, the mn10200 (OBSOLETE) and mn10300 simulators). NULL
345 is not a special value for this field. Valid for all types except
349 /* For hardware watchpoints, the size of the memory region being
350 watched. For hardware ranged breakpoints, the size of the
354 /* Type of hardware watchpoint. */
355 enum target_hw_bp_type watchpoint_type
;
357 /* For any breakpoint type with an address, this is the section
358 associated with the address. Used primarily for overlay
360 struct obj_section
*section
;
362 /* Address at which breakpoint was requested, either by the user or
363 by GDB for internal breakpoints. This will usually be the same
364 as ``address'' (above) except for cases in which
365 ADJUST_BREAKPOINT_ADDRESS has computed a different address at
366 which to place the breakpoint in order to comply with a
367 processor's architectual constraints. */
368 CORE_ADDR requested_address
;
372 /* Details of the placed breakpoint, when inserted. */
373 struct bp_target_info target_info
;
375 /* Similarly, for the breakpoint at an overlay's LMA, if necessary. */
376 struct bp_target_info overlay_target_info
;
378 /* In a non-stop mode, it's possible that we delete a breakpoint,
379 but as we do that, some still running thread hits that breakpoint.
380 For that reason, we need to keep locations belonging to deleted
381 breakpoints for a bit, so that don't report unexpected SIGTRAP.
382 We can't keep such locations forever, so we use a heuristic --
383 after we process certain number of inferior events since
384 breakpoint was deleted, we retire all locations of that breakpoint.
385 This variable keeps a number of events still to go, when
386 it becomes 0 this location is retired. */
387 int events_till_retirement
;
390 /* This structure is a collection of function pointers that, if available,
391 will be called instead of the performing the default action for this
394 struct breakpoint_ops
396 /* Destructor. Releases everything from SELF (but not SELF
398 void (*dtor
) (struct breakpoint
*self
);
400 /* Insert the breakpoint or watchpoint or activate the catchpoint.
401 Return 0 for success, 1 if the breakpoint, watchpoint or catchpoint
402 type is not supported, -1 for failure. */
403 int (*insert_location
) (struct bp_location
*);
405 /* Remove the breakpoint/catchpoint that was previously inserted
406 with the "insert" method above. Return 0 for success, 1 if the
407 breakpoint, watchpoint or catchpoint type is not supported,
409 int (*remove_location
) (struct bp_location
*);
411 /* Return non-zero if the debugger should tell the user that this
412 breakpoint was hit. */
413 int (*breakpoint_hit
) (const struct bp_location
*, struct address_space
*,
416 /* Tell how many hardware resources (debug registers) are needed
417 for this breakpoint. If this function is not provided, then
418 the breakpoint or watchpoint needs one debug register. */
419 int (*resources_needed
) (const struct bp_location
*);
421 /* Tell whether we can downgrade from a hardware watchpoint to a software
422 one. If not, the user will not be able to enable the watchpoint when
423 there are not enough hardware resources available. */
424 int (*works_in_software_mode
) (const struct breakpoint
*);
426 /* The normal print routine for this breakpoint, called when we
428 enum print_stop_action (*print_it
) (struct breakpoint
*);
430 /* Display information about this breakpoint, for "info
432 void (*print_one
) (struct breakpoint
*, struct bp_location
**);
434 /* Display extra information about this breakpoint, below the normal
435 breakpoint description in "info breakpoints".
437 In the example below, the "address range" line was printed
438 by print_one_detail_ranged_breakpoint.
440 (gdb) info breakpoints
441 Num Type Disp Enb Address What
442 2 hw breakpoint keep y in main at test-watch.c:70
443 address range: [0x10000458, 0x100004c7]
446 void (*print_one_detail
) (const struct breakpoint
*, struct ui_out
*);
448 /* Display information about this breakpoint after setting it
449 (roughly speaking; this is called from "mention"). */
450 void (*print_mention
) (struct breakpoint
*);
452 /* Print to FP the CLI command that recreates this breakpoint. */
453 void (*print_recreate
) (struct breakpoint
*, struct ui_file
*fp
);
456 enum watchpoint_triggered
458 /* This watchpoint definitely did not trigger. */
459 watch_triggered_no
= 0,
461 /* Some hardware watchpoint triggered, and it might have been this
462 one, but we do not know which it was. */
463 watch_triggered_unknown
,
465 /* This hardware watchpoint definitely did trigger. */
469 /* This is used to declare the VEC syscalls_to_be_caught. */
472 typedef struct bp_location
*bp_location_p
;
473 DEF_VEC_P(bp_location_p
);
475 /* A reference-counted struct command_line. This lets multiple
476 breakpoints share a single command list. This is an implementation
477 detail to the breakpoints module. */
478 struct counted_command_line
;
480 /* Some targets (e.g., embedded PowerPC) need two debug registers to set
481 a watchpoint over a memory region. If this flag is true, GDB will use
482 only one register per watchpoint, thus assuming that all acesses that
483 modify a memory location happen at its starting address. */
485 extern int target_exact_watchpoints
;
487 /* Note that the ->silent field is not currently used by any commands
488 (though the code is in there if it was to be, and set_raw_breakpoint
489 does set it to 0). I implemented it because I thought it would be
490 useful for a hack I had to put in; I'm going to leave it in because
491 I can see how there might be times when it would indeed be useful */
493 /* This is for a breakpoint or a watchpoint. */
497 struct breakpoint
*next
;
498 /* Type of breakpoint. */
500 /* Zero means disabled; remember the info but don't break here. */
501 enum enable_state enable_state
;
502 /* What to do with this breakpoint after we hit it. */
503 enum bpdisp disposition
;
504 /* Number assigned to distinguish breakpoints. */
507 /* Location(s) associated with this high-level breakpoint. */
508 struct bp_location
*loc
;
510 /* Line number of this address. */
514 /* Source file name of this address. */
518 /* Non-zero means a silent breakpoint (don't print frame info
520 unsigned char silent
;
521 /* Non-zero means display ADDR_STRING to the user verbatim. */
522 unsigned char display_canonical
;
523 /* Number of stops at this breakpoint that should
524 be continued automatically before really stopping. */
526 /* Chain of command lines to execute when this breakpoint is
528 struct counted_command_line
*commands
;
529 /* Stack depth (address of frame). If nonzero, break only if fp
531 struct frame_id frame_id
;
533 /* The program space used to set the breakpoint. */
534 struct program_space
*pspace
;
536 /* String we used to set the breakpoint (malloc'd). */
539 /* For a ranged breakpoint, the string we used to find
540 the end of the range (malloc'd). */
541 char *addr_string_range_end
;
543 /* Architecture we used to set the breakpoint. */
544 struct gdbarch
*gdbarch
;
545 /* Language we used to set the breakpoint. */
546 enum language language
;
547 /* Input radix we used to set the breakpoint. */
549 /* String form of the breakpoint condition (malloc'd), or NULL if
550 there is no condition. */
552 /* String form of exp to use for displaying to the user
553 (malloc'd), or NULL if none. */
555 /* String form to use for reparsing of EXP (malloc'd) or NULL. */
556 char *exp_string_reparse
;
558 /* The expression we are watching, or NULL if not a watchpoint. */
559 struct expression
*exp
;
560 /* The largest block within which it is valid, or NULL if it is
561 valid anywhere (e.g. consists just of global symbols). */
562 struct block
*exp_valid_block
;
563 /* The conditional expression if any. NULL if not a watchpoint. */
564 struct expression
*cond_exp
;
565 /* The largest block within which it is valid, or NULL if it is
566 valid anywhere (e.g. consists just of global symbols). */
567 struct block
*cond_exp_valid_block
;
568 /* Value of the watchpoint the last time we checked it, or NULL
569 when we do not know the value yet or the value was not
570 readable. VAL is never lazy. */
572 /* Nonzero if VAL is valid. If VAL_VALID is set but VAL is NULL,
573 then an error occurred reading the value. */
576 /* Holds the address of the related watchpoint_scope breakpoint
577 when using watchpoints on local variables (might the concept of
578 a related breakpoint be useful elsewhere, if not just call it
579 the watchpoint_scope breakpoint or something like that.
581 struct breakpoint
*related_breakpoint
;
583 /* Holds the frame address which identifies the frame this
584 watchpoint should be evaluated in, or `null' if the watchpoint
585 should be evaluated on the outermost frame. */
586 struct frame_id watchpoint_frame
;
588 /* Holds the thread which identifies the frame this watchpoint
589 should be considered in scope for, or `null_ptid' if the
590 watchpoint should be evaluated in all threads. */
591 ptid_t watchpoint_thread
;
593 /* For hardware watchpoints, the triggered status according to the
595 enum watchpoint_triggered watchpoint_triggered
;
597 /* Thread number for thread-specific breakpoint,
598 or -1 if don't care. */
601 /* Ada task number for task-specific breakpoint,
602 or 0 if don't care. */
605 /* Count of the number of times this breakpoint was taken, dumped
606 with the info, but not used for anything else. Useful for
607 seeing how many times you hit a break prior to the program
608 aborting, so you can back up to just before the abort. */
611 /* Methods associated with this breakpoint. */
612 struct breakpoint_ops
*ops
;
614 /* Is breakpoint's condition not yet parsed because we found
615 no location initially so had no context to parse
617 int condition_not_parsed
;
619 /* Number of times this tracepoint should single-step
620 and collect additional data. */
623 /* Number of times this tracepoint should be hit before
627 /* The number of the tracepoint on the target. */
628 int number_on_target
;
630 /* The static tracepoint marker id, if known. */
631 char *static_trace_marker_id
;
633 /* LTTng/UST allow more than one marker with the same ID string,
634 although it unadvised because it confuses tools. When setting
635 static tracepoints by marker ID, this will record the index in
636 the array of markers we found for the given marker ID for which
637 this static tracepoint corresponds. When resetting
638 breakpoints, we will use this index to try to find the same
640 int static_trace_marker_id_idx
;
642 /* With a Python scripting enabled GDB, store a reference to the
643 Python object that has been associated with this breakpoint.
644 This is always NULL for a GDB that is not script enabled. It
645 can sometimes be NULL for enabled GDBs as not all breakpoint
646 types are tracked by the Python scripting API. */
647 struct breakpoint_object
*py_bp_object
;
649 /* Whether this watchpoint is exact (see target_exact_watchpoints). */
652 /* The mask address for a masked hardware watchpoint. */
653 CORE_ADDR hw_wp_mask
;
656 typedef struct breakpoint
*breakpoint_p
;
657 DEF_VEC_P(breakpoint_p
);
659 /* The following stuff is an abstract data type "bpstat" ("breakpoint
660 status"). This provides the ability to determine whether we have
661 stopped at a breakpoint, and what we should do about it. */
663 typedef struct bpstats
*bpstat
;
665 /* Clears a chain of bpstat, freeing storage
667 extern void bpstat_clear (bpstat
*);
669 /* Return a copy of a bpstat. Like "bs1 = bs2" but all storage that
670 is part of the bpstat is copied as well. */
671 extern bpstat
bpstat_copy (bpstat
);
673 extern bpstat
bpstat_stop_status (struct address_space
*aspace
,
674 CORE_ADDR pc
, ptid_t ptid
);
676 /* This bpstat_what stuff tells wait_for_inferior what to do with a
677 breakpoint (a challenging task).
679 The enum values order defines priority-like order of the actions.
680 Once you've decided that some action is appropriate, you'll never
681 go back and decide something of a lower priority is better. Each
682 of these actions is mutually exclusive with the others. That
683 means, that if you find yourself adding a new action class here and
684 wanting to tell GDB that you have two simultaneous actions to
685 handle, something is wrong, and you probably don't actually need a
688 Note that a step resume breakpoint overrides another breakpoint of
689 signal handling (see comment in wait_for_inferior at where we set
690 the step_resume breakpoint). */
692 enum bpstat_what_main_action
694 /* Perform various other tests; that is, this bpstat does not
695 say to perform any action (e.g. failed watchpoint and nothing
697 BPSTAT_WHAT_KEEP_CHECKING
,
699 /* Remove breakpoints, single step once, then put them back in and
700 go back to what we were doing. It's possible that this should
701 be removed from the main_action and put into a separate field,
702 to more cleanly handle
703 BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE. */
706 /* Set longjmp_resume breakpoint, remove all other breakpoints,
707 and continue. The "remove all other breakpoints" part is
708 required if we are also stepping over another breakpoint as
709 well as doing the longjmp handling. */
710 BPSTAT_WHAT_SET_LONGJMP_RESUME
,
712 /* Clear longjmp_resume breakpoint, then handle as
713 BPSTAT_WHAT_KEEP_CHECKING. */
714 BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
,
716 /* Clear step resume breakpoint, and keep checking. */
717 BPSTAT_WHAT_STEP_RESUME
,
719 /* Rather than distinguish between noisy and silent stops here, it
720 might be cleaner to have bpstat_print make that decision (also
721 taking into account stop_print_frame and source_only). But the
722 implications are a bit scary (interaction with auto-displays,
723 etc.), so I won't try it. */
726 BPSTAT_WHAT_STOP_SILENT
,
728 /* Stop and print. */
729 BPSTAT_WHAT_STOP_NOISY
,
731 /* Clear step resume breakpoint, and keep checking. High-priority
732 step-resume breakpoints are used when even if there's a user
733 breakpoint at the current PC when we set the step-resume
734 breakpoint, we don't want to re-handle any breakpoint other
735 than the step-resume when it's hit; instead we want to move
736 past the breakpoint. This is used in the case of skipping
738 BPSTAT_WHAT_HP_STEP_RESUME
,
741 /* An enum indicating the kind of "stack dummy" stop. This is a bit
742 of a misnomer because only one kind of truly a stack dummy. */
745 /* We didn't stop at a stack dummy breakpoint. */
748 /* Stopped at a stack dummy. */
751 /* Stopped at std::terminate. */
757 enum bpstat_what_main_action main_action
;
759 /* Did we hit a call dummy breakpoint? This only goes with a
760 main_action of BPSTAT_WHAT_STOP_SILENT or
761 BPSTAT_WHAT_STOP_NOISY (the concept of continuing from a call
762 dummy without popping the frame is not a useful one). */
763 enum stop_stack_kind call_dummy
;
765 /* Used for BPSTAT_WHAT_SET_LONGJMP_RESUME and
766 BPSTAT_WHAT_CLEAR_LONGJMP_RESUME. True if we are handling a
767 longjmp, false if we are handling an exception. */
771 /* The possible return values for print_bpstat, print_it_normal,
772 print_it_done, print_it_noop. */
773 enum print_stop_action
781 /* Tell what to do about this bpstat. */
782 struct bpstat_what
bpstat_what (bpstat
);
784 /* Find the bpstat associated with a breakpoint. NULL otherwise. */
785 bpstat
bpstat_find_breakpoint (bpstat
, struct breakpoint
*);
787 /* Nonzero if a signal that we got in wait() was due to circumstances
788 explained by the BS. */
789 /* Currently that is true if we have hit a breakpoint, or if there is
790 a watchpoint enabled. */
791 #define bpstat_explains_signal(bs) ((bs) != NULL)
793 /* Nonzero is this bpstat causes a stop. */
794 extern int bpstat_causes_stop (bpstat
);
796 /* Nonzero if we should step constantly (e.g. watchpoints on machines
797 without hardware support). This isn't related to a specific bpstat,
798 just to things like whether watchpoints are set. */
799 extern int bpstat_should_step (void);
801 /* Print a message indicating what happened. Returns nonzero to
802 say that only the source line should be printed after this (zero
803 return means print the frame as well as the source line). */
804 extern enum print_stop_action
bpstat_print (bpstat
);
806 /* Put in *NUM the breakpoint number of the first breakpoint we are
807 stopped at. *BSP upon return is a bpstat which points to the
808 remaining breakpoints stopped at (but which is not guaranteed to be
809 good for anything but further calls to bpstat_num).
811 Return 0 if passed a bpstat which does not indicate any breakpoints.
812 Return -1 if stopped at a breakpoint that has been deleted since
814 Return 1 otherwise. */
815 extern int bpstat_num (bpstat
*, int *);
817 /* Perform actions associated with the stopped inferior. Actually, we
818 just use this for breakpoint commands. Perhaps other actions will
819 go here later, but this is executed at a late time (from the
821 extern void bpstat_do_actions (void);
823 /* Modify BS so that the actions will not be performed. */
824 extern void bpstat_clear_actions (bpstat
);
826 /* Implementation: */
828 /* Values used to tell the printing routine how to behave for this
832 /* This is used when we want to do a normal printing of the reason
833 for stopping. The output will depend on the type of eventpoint
834 we are dealing with. This is the default value, most commonly
837 /* This is used when nothing should be printed for this bpstat
840 /* This is used when everything which needs to be printed has
841 already been printed. But we still want to print the frame. */
847 /* Linked list because there can be more than one breakpoint at
848 the same place, and a bpstat reflects the fact that all have
852 /* Location that caused the stop. Locations are refcounted, so
853 this will never be NULL. Note that this location may end up
854 detached from a breakpoint, but that does not necessary mean
855 that the struct breakpoint is gone. E.g., consider a
856 watchpoint with a condition that involves an inferior function
857 call. Watchpoint locations are recreated often (on resumes,
858 hence on infcalls too). Between creating the bpstat and after
859 evaluating the watchpoint condition, this location may hence
860 end up detached from its original owner watchpoint, even though
861 the watchpoint is still listed. If it's condition evaluates as
862 true, we still want this location to cause a stop, and we will
863 still need to know which watchpoint it was originally attached.
864 What this means is that we should not (in most cases) follow
865 the `bpstat->bp_location->owner' link, but instead use the
866 `breakpoint_at' field below. */
867 struct bp_location
*bp_location_at
;
869 /* Breakpoint that caused the stop. This is nullified if the
870 breakpoint ends up being deleted. See comments on
871 `bp_location_at' above for why do we need this field instead of
872 following the location's owner. */
873 struct breakpoint
*breakpoint_at
;
875 /* The associated command list. */
876 struct counted_command_line
*commands
;
878 /* Commands left to be done. This points somewhere in
880 struct command_line
*commands_left
;
882 /* Old value associated with a watchpoint. */
883 struct value
*old_val
;
885 /* Nonzero if this breakpoint tells us to print the frame. */
888 /* Nonzero if this breakpoint tells us to stop. */
891 /* Tell bpstat_print and print_bp_stop_message how to print stuff
892 associated with this element of the bpstat chain. */
893 enum bp_print_how print_it
;
904 /* The possible return values for breakpoint_here_p.
905 We guarantee that zero always means "no breakpoint here". */
908 no_breakpoint_here
= 0,
909 ordinary_breakpoint_here
,
910 permanent_breakpoint_here
914 /* Prototypes for breakpoint-related functions. */
916 extern enum breakpoint_here
breakpoint_here_p (struct address_space
*,
919 extern int moribund_breakpoint_here_p (struct address_space
*, CORE_ADDR
);
921 extern int breakpoint_inserted_here_p (struct address_space
*, CORE_ADDR
);
923 extern int regular_breakpoint_inserted_here_p (struct address_space
*,
926 extern int software_breakpoint_inserted_here_p (struct address_space
*,
929 /* Returns true if there's a hardware watchpoint or access watchpoint
930 inserted in the range defined by ADDR and LEN. */
931 extern int hardware_watchpoint_inserted_in_range (struct address_space
*,
935 extern int breakpoint_thread_match (struct address_space
*,
938 extern void until_break_command (char *, int, int);
940 extern void update_breakpoint_locations (struct breakpoint
*b
,
941 struct symtabs_and_lines sals
,
942 struct symtabs_and_lines sals_end
);
944 extern void breakpoint_re_set (void);
946 extern void breakpoint_re_set_thread (struct breakpoint
*);
948 extern struct breakpoint
*set_momentary_breakpoint
949 (struct gdbarch
*, struct symtab_and_line
, struct frame_id
, enum bptype
);
951 extern struct breakpoint
*set_momentary_breakpoint_at_pc
952 (struct gdbarch
*, CORE_ADDR pc
, enum bptype type
);
954 extern struct breakpoint
*clone_momentary_breakpoint (struct breakpoint
*bpkt
);
956 extern void set_ignore_count (int, int, int);
958 extern void set_default_breakpoint (int, struct program_space
*,
959 CORE_ADDR
, struct symtab
*, int);
961 extern void breakpoint_init_inferior (enum inf_context
);
963 extern struct cleanup
*make_cleanup_delete_breakpoint (struct breakpoint
*);
965 extern void delete_breakpoint (struct breakpoint
*);
967 extern void breakpoint_auto_delete (bpstat
);
969 /* Return the chain of command lines to execute when this breakpoint
971 extern struct command_line
*breakpoint_commands (struct breakpoint
*b
);
973 /* Return a string image of DISP. The string is static, and thus should
974 NOT be deallocated after use. */
975 const char *bpdisp_text (enum bpdisp disp
);
977 extern void break_command (char *, int);
979 extern void hbreak_command_wrapper (char *, int);
980 extern void thbreak_command_wrapper (char *, int);
981 extern void rbreak_command_wrapper (char *, int);
982 extern void watch_command_wrapper (char *, int, int);
983 extern void awatch_command_wrapper (char *, int, int);
984 extern void rwatch_command_wrapper (char *, int, int);
985 extern void tbreak_command (char *, int);
987 extern int create_breakpoint (struct gdbarch
*gdbarch
, char *arg
,
988 char *cond_string
, int thread
,
989 int parse_condition_and_thread
,
990 int tempflag
, enum bptype wanted_type
,
992 enum auto_boolean pending_break_support
,
993 struct breakpoint_ops
*ops
,
998 extern void insert_breakpoints (void);
1000 extern int remove_breakpoints (void);
1002 extern int remove_breakpoints_pid (int pid
);
1004 /* This function can be used to physically insert eventpoints from the
1005 specified traced inferior process, without modifying the breakpoint
1006 package's state. This can be useful for those targets which
1007 support following the processes of a fork() or vfork() system call,
1008 when both of the resulting two processes are to be followed. */
1009 extern int reattach_breakpoints (int);
1011 /* This function can be used to update the breakpoint package's state
1012 after an exec() system call has been executed.
1014 This function causes the following:
1016 - All eventpoints are marked "not inserted".
1017 - All eventpoints with a symbolic address are reset such that
1018 the symbolic address must be reevaluated before the eventpoints
1020 - The solib breakpoints are explicitly removed from the breakpoint
1022 - A step-resume breakpoint, if any, is explicitly removed from the
1024 - All eventpoints without a symbolic address are removed from the
1026 extern void update_breakpoints_after_exec (void);
1028 /* This function can be used to physically remove hardware breakpoints
1029 and watchpoints from the specified traced inferior process, without
1030 modifying the breakpoint package's state. This can be useful for
1031 those targets which support following the processes of a fork() or
1032 vfork() system call, when one of the resulting two processes is to
1033 be detached and allowed to run free.
1035 It is an error to use this function on the process whose id is
1037 extern int detach_breakpoints (int);
1039 /* This function is called when program space PSPACE is about to be
1040 deleted. It takes care of updating breakpoints to not reference
1041 this PSPACE anymore. */
1042 extern void breakpoint_program_space_exit (struct program_space
*pspace
);
1044 extern void set_longjmp_breakpoint (struct thread_info
*tp
,
1045 struct frame_id frame
);
1046 extern void delete_longjmp_breakpoint (int thread
);
1048 extern void enable_overlay_breakpoints (void);
1049 extern void disable_overlay_breakpoints (void);
1051 extern void set_std_terminate_breakpoint (void);
1052 extern void delete_std_terminate_breakpoint (void);
1054 /* These functions respectively disable or reenable all currently
1055 enabled watchpoints. When disabled, the watchpoints are marked
1056 call_disabled. When re-enabled, they are marked enabled.
1058 The intended client of these functions is call_function_by_hand.
1060 The inferior must be stopped, and all breakpoints removed, when
1061 these functions are used.
1063 The need for these functions is that on some targets (e.g., HP-UX),
1064 gdb is unable to unwind through the dummy frame that is pushed as
1065 part of the implementation of a call command. Watchpoints can
1066 cause the inferior to stop in places where this frame is visible,
1067 and that can cause execution control to become very confused.
1069 Note that if a user sets breakpoints in an interactively called
1070 function, the call_disabled watchpoints will have been re-enabled
1071 when the first such breakpoint is reached. However, on targets
1072 that are unable to unwind through the call dummy frame, watches
1073 of stack-based storage may then be deleted, because gdb will
1074 believe that their watched storage is out of scope. (Sigh.) */
1075 extern void disable_watchpoints_before_interactive_call_start (void);
1077 extern void enable_watchpoints_after_interactive_call_stop (void);
1079 /* These functions disable and re-enable all breakpoints during
1080 inferior startup. They are intended to be called from solib
1081 code where necessary. This is needed on platforms where the
1082 main executable is relocated at some point during startup
1083 processing, making breakpoint addresses invalid.
1085 If additional breakpoints are created after the routine
1086 disable_breakpoints_before_startup but before the routine
1087 enable_breakpoints_after_startup was called, they will also
1088 be marked as disabled. */
1089 extern void disable_breakpoints_before_startup (void);
1090 extern void enable_breakpoints_after_startup (void);
1092 /* For script interpreters that need to define breakpoint commands
1093 after they've already read the commands into a struct
1095 extern enum command_control_type commands_from_control_command
1096 (char *arg
, struct command_line
*cmd
);
1098 extern void clear_breakpoint_hit_counts (void);
1100 extern struct breakpoint
*get_breakpoint (int num
);
1102 /* The following are for displays, which aren't really breakpoints,
1103 but here is as good a place as any for them. */
1105 extern void disable_current_display (void);
1107 extern void do_displays (void);
1109 extern void disable_display (int);
1111 extern void clear_displays (void);
1113 extern void disable_breakpoint (struct breakpoint
*);
1115 extern void enable_breakpoint (struct breakpoint
*);
1117 extern void breakpoint_set_commands (struct breakpoint
*b
,
1118 struct command_line
*commands
);
1120 extern void breakpoint_set_silent (struct breakpoint
*b
, int silent
);
1122 extern void breakpoint_set_thread (struct breakpoint
*b
, int thread
);
1124 extern void breakpoint_set_task (struct breakpoint
*b
, int task
);
1126 /* Clear the "inserted" flag in all breakpoints. */
1127 extern void mark_breakpoints_out (void);
1129 extern void make_breakpoint_permanent (struct breakpoint
*);
1131 extern struct breakpoint
*create_jit_event_breakpoint (struct gdbarch
*,
1134 extern struct breakpoint
*create_solib_event_breakpoint (struct gdbarch
*,
1137 extern struct breakpoint
*create_thread_event_breakpoint (struct gdbarch
*,
1140 extern void remove_jit_event_breakpoints (void);
1142 extern void remove_solib_event_breakpoints (void);
1144 extern void remove_thread_event_breakpoints (void);
1146 extern void disable_breakpoints_in_shlibs (void);
1148 /* This function returns TRUE if ep is a catchpoint. */
1149 extern int ep_is_catchpoint (struct breakpoint
*);
1151 /* Enable breakpoints and delete when hit. Called with ARG == NULL
1152 deletes all breakpoints. */
1153 extern void delete_command (char *arg
, int from_tty
);
1155 /* Manage a software single step breakpoint (or two). Insert may be
1156 called twice before remove is called. */
1157 extern void insert_single_step_breakpoint (struct gdbarch
*,
1158 struct address_space
*,
1160 extern int single_step_breakpoints_inserted (void);
1161 extern void remove_single_step_breakpoints (void);
1162 extern void cancel_single_step_breakpoints (void);
1164 /* Manage manual breakpoints, separate from the normal chain of
1165 breakpoints. These functions are used in murky target-specific
1166 ways. Please do not add more uses! */
1167 extern void *deprecated_insert_raw_breakpoint (struct gdbarch
*,
1168 struct address_space
*,
1170 extern int deprecated_remove_raw_breakpoint (struct gdbarch
*, void *);
1172 /* Check if any hardware watchpoints have triggered, according to the
1174 int watchpoints_triggered (struct target_waitstatus
*);
1176 /* Update BUF, which is LEN bytes read from the target address MEMADDR,
1177 by replacing any memory breakpoints with their shadowed contents. */
1178 void breakpoint_restore_shadows (gdb_byte
*buf
, ULONGEST memaddr
,
1181 extern int breakpoints_always_inserted_mode (void);
1183 /* Called each time new event from target is processed.
1184 Retires previously deleted breakpoint locations that
1185 in our opinion won't ever trigger. */
1186 extern void breakpoint_retire_moribund (void);
1188 /* Set break condition of breakpoint B to EXP. */
1189 extern void set_breakpoint_condition (struct breakpoint
*b
, char *exp
,
1192 /* Checks if we are catching syscalls or not.
1193 Returns 0 if not, greater than 0 if we are. */
1194 extern int catch_syscall_enabled (void);
1196 /* Checks if we are catching syscalls with the specific
1197 syscall_number. Used for "filtering" the catchpoints.
1198 Returns 0 if not, greater than 0 if we are. */
1199 extern int catching_syscall_number (int syscall_number
);
1201 /* Return a tracepoint with the given number if found. */
1202 extern struct breakpoint
*get_tracepoint (int num
);
1204 extern struct breakpoint
*get_tracepoint_by_number_on_target (int num
);
1206 /* Find a tracepoint by parsing a number in the supplied string. */
1207 extern struct breakpoint
*
1208 get_tracepoint_by_number (char **arg
,
1209 struct get_number_or_range_state
*state
,
1212 /* Return a vector of all tracepoints currently defined. The vector
1213 is newly allocated; the caller should free when done with it. */
1214 extern VEC(breakpoint_p
) *all_tracepoints (void);
1216 extern int is_tracepoint (const struct breakpoint
*b
);
1218 /* Return a vector of all static tracepoints defined at ADDR. The
1219 vector is newly allocated; the caller should free when done with
1221 extern VEC(breakpoint_p
) *static_tracepoints_here (CORE_ADDR addr
);
1223 /* Function that can be passed to read_command_line to validate
1224 that each command is suitable for tracepoint command list. */
1225 extern void check_tracepoint_command (char *line
, void *closure
);
1227 /* Call at the start and end of an "rbreak" command to register
1228 breakpoint numbers for a later "commands" command. */
1229 extern void start_rbreak_breakpoints (void);
1230 extern void end_rbreak_breakpoints (void);
1232 /* Breakpoint iterator function.
1234 Calls a callback function once for each breakpoint, so long as the
1235 callback function returns false. If the callback function returns
1236 true, the iteration will end and the current breakpoint will be
1237 returned. This can be useful for implementing a search for a
1238 breakpoint with arbitrary attributes, or for applying an operation
1239 to every breakpoint. */
1240 extern struct breakpoint
*iterate_over_breakpoints (int (*) (struct breakpoint
*,
1243 extern int user_breakpoint_p (struct breakpoint
*);
1245 #endif /* !defined (BREAKPOINT_H) */