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1 24 jeremybenn
/* 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 Free Software Foundation, Inc.
4
 
5
   This file is part of GDB.
6
 
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.
11
 
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.
16
 
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/>.  */
19
 
20
#if !defined (BREAKPOINT_H)
21
#define BREAKPOINT_H 1
22
 
23
#include "frame.h"
24
#include "value.h"
25
#include "vec.h"
26
 
27
#include "gdb-events.h"
28
 
29
struct value;
30
struct block;
31
 
32
/* This is the maximum number of bytes a breakpoint instruction can take.
33
   Feel free to increase it.  It's just used in a few places to size
34
   arrays that should be independent of the target architecture.  */
35
 
36
#define BREAKPOINT_MAX  16
37
 
38
/* Type of breakpoint. */
39
/* FIXME In the future, we should fold all other breakpoint-like things into
40
   here.  This includes:
41
 
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).  */
45
 
46
enum bptype
47
  {
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() */
59
 
60
    /* Used by wait_for_inferior for stepping over subroutine calls, for
61
       stepping over signal handlers, and for skipping prologues.  */
62
    bp_step_resume,
63
 
64
    /* Used to detect when a watchpoint expression has gone out of
65
       scope.  These breakpoints are usually not visible to the user.
66
 
67
       This breakpoint has some interesting properties:
68
 
69
       1) There's always a 1:1 mapping between watchpoints
70
       on local variables and watchpoint_scope breakpoints.
71
 
72
       2) It automatically deletes itself and the watchpoint it's
73
       associated with when hit.
74
 
75
       3) It can never be disabled.  */
76
    bp_watchpoint_scope,
77
 
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)).  */
85
    bp_call_dummy,
86
 
87
    /* Some dynamic linkers (HP, maybe Solaris) can arrange for special
88
       code in the inferior to run when significant events occur in the
89
       dynamic linker (for example a library is loaded or unloaded).
90
 
91
       By placing a breakpoint in this magic code GDB will get control
92
       when these significant events occur.  GDB can then re-examine
93
       the dynamic linker's data structures to discover any newly loaded
94
       dynamic libraries.  */
95
    bp_shlib_event,
96
 
97
    /* Some multi-threaded systems can arrange for a location in the
98
       inferior to be executed when certain thread-related events occur
99
       (such as thread creation or thread death).
100
 
101
       By placing a breakpoint at one of these locations, GDB will get
102
       control when these events occur.  GDB can then update its thread
103
       lists etc.  */
104
 
105
    bp_thread_event,
106
 
107
    /* On the same principal, an overlay manager can arrange to call a
108
       magic location in the inferior whenever there is an interesting
109
       change in overlay status.  GDB can update its overlay tables
110
       and fiddle with breakpoints in overlays when this breakpoint
111
       is hit.  */
112
 
113
    bp_overlay_event,
114
 
115
    /* These breakpoints are used to implement the "catch load" command
116
       on platforms whose dynamic linkers support such functionality.  */
117
    bp_catch_load,
118
 
119
    /* These breakpoints are used to implement the "catch unload" command
120
       on platforms whose dynamic linkers support such functionality.  */
121
    bp_catch_unload,
122
 
123
    /* These are not really breakpoints, but are catchpoints that
124
       implement the "catch fork", "catch vfork" and "catch exec" commands
125
       on platforms whose kernel support such functionality.  (I.e.,
126
       kernels which can raise an event when a fork or exec occurs, as
127
       opposed to the debugger setting breakpoints on functions named
128
       "fork" or "exec".) */
129
    bp_catch_fork,
130
    bp_catch_vfork,
131
    bp_catch_exec,
132
  };
133
 
134
/* States of enablement of breakpoint. */
135
 
136
enum enable_state
137
  {
138
    bp_disabled,        /* The eventpoint is inactive, and cannot trigger. */
139
    bp_enabled,         /* The eventpoint is active, and can trigger. */
140
    bp_call_disabled,   /* The eventpoint has been disabled while a call
141
                           into the inferior is "in flight", because some
142
                           eventpoints interfere with the implementation of
143
                           a call on some targets.  The eventpoint will be
144
                           automatically enabled and reset when the call
145
                           "lands" (either completes, or stops at another
146
                           eventpoint). */
147
    bp_permanent        /* There is a breakpoint instruction hard-wired into
148
                           the target's code.  Don't try to write another
149
                           breakpoint instruction on top of it, or restore
150
                           its value.  Step over it using the architecture's
151
                           SKIP_INSN macro.  */
152
  };
153
 
154
 
155
/* Disposition of breakpoint.  Ie: what to do after hitting it. */
156
 
157
enum bpdisp
158
  {
159
    disp_del,                   /* Delete it */
160
    disp_del_at_next_stop,      /* Delete at next stop, whether hit or not */
161
    disp_disable,               /* Disable it */
162
    disp_donttouch              /* Leave it alone */
163
  };
164
 
165
enum target_hw_bp_type
166
  {
167
    hw_write   = 0,              /* Common  HW watchpoint */
168
    hw_read    = 1,             /* Read    HW watchpoint */
169
    hw_access  = 2,             /* Access  HW watchpoint */
170
    hw_execute = 3              /* Execute HW breakpoint */
171
  };
172
 
173
 
174
/* Information used by targets to insert and remove breakpoints.  */
175
 
176
struct bp_target_info
177
{
178
  /* Address at which the breakpoint was placed.  This is normally the
179
     same as ADDRESS from the bp_location, except when adjustment
180
     happens in gdbarch_breakpoint_from_pc.  The most common form of
181
     adjustment is stripping an alternate ISA marker from the PC which
182
     is used to determine the type of breakpoint to insert.  */
183
  CORE_ADDR placed_address;
184
 
185
  /* If the breakpoint lives in memory and reading that memory would
186
     give back the breakpoint, instead of the original contents, then
187
     the original contents are cached here.  Only SHADOW_LEN bytes of
188
     this buffer are valid, and only when the breakpoint is inserted.  */
189
  gdb_byte shadow_contents[BREAKPOINT_MAX];
190
 
191
  /* The length of the data cached in SHADOW_CONTENTS.  */
192
  int shadow_len;
193
 
194
  /* The size of the placed breakpoint, according to
195
     gdbarch_breakpoint_from_pc, when the breakpoint was inserted.  This is
196
     generally the same as SHADOW_LEN, unless we did not need
197
     to read from the target to implement the memory breakpoint
198
     (e.g. if a remote stub handled the details).  We may still
199
     need the size to remove the breakpoint safely.  */
200
  int placed_size;
201
};
202
 
203
/* GDB maintains two types of information about each breakpoint (or
204
   watchpoint, or other related event).  The first type corresponds
205
   to struct breakpoint; this is a relatively high-level structure
206
   which contains the source location(s), stopping conditions, user
207
   commands to execute when the breakpoint is hit, and so forth.
208
 
209
   The second type of information corresponds to struct bp_location.
210
   Each breakpoint has one or (eventually) more locations associated
211
   with it, which represent target-specific and machine-specific
212
   mechanisms for stopping the program.  For instance, a watchpoint
213
   expression may require multiple hardware watchpoints in order to
214
   catch all changes in the value of the expression being watched.  */
215
 
216
enum bp_loc_type
217
{
218
  bp_loc_software_breakpoint,
219
  bp_loc_hardware_breakpoint,
220
  bp_loc_hardware_watchpoint,
221
  bp_loc_other                  /* Miscellaneous...  */
222
};
223
 
224
struct bp_location
225
{
226
  /* Chain pointer to the next breakpoint location for
227
     the same parent breakpoint.  */
228
  struct bp_location *next;
229
 
230
  /* Pointer to the next breakpoint location, in a global
231
     list of all breakpoint locations.  */
232
  struct bp_location *global_next;
233
 
234
  /* Type of this breakpoint location.  */
235
  enum bp_loc_type loc_type;
236
 
237
  /* Each breakpoint location must belong to exactly one higher-level
238
     breakpoint.  This and the DUPLICATE flag are more straightforward
239
     than reference counting.  */
240
  struct breakpoint *owner;
241
 
242
  /* Conditional.  Break only if this expression's value is nonzero.
243
     Unlike string form of condition, which is associated with breakpoint,
244
     this is associated with location, since if breakpoint has several
245
     locations,  the evaluation of expression can be different for
246
     different locations.  */
247
  struct expression *cond;
248
 
249
  /* This location's address is in an unloaded solib, and so this
250
     location should not be inserted.  It will be automatically
251
     enabled when that solib is loaded.  */
252
  char shlib_disabled;
253
 
254
  /* Is this particular location enabled.  */
255
  char enabled;
256
 
257
  /* Nonzero if this breakpoint is now inserted.  */
258
  char inserted;
259
 
260
  /* Nonzero if this is not the first breakpoint in the list
261
     for the given address.  */
262
  char duplicate;
263
 
264
  /* If we someday support real thread-specific breakpoints, then
265
     the breakpoint location will need a thread identifier.  */
266
 
267
  /* Data for specific breakpoint types.  These could be a union, but
268
     simplicity is more important than memory usage for breakpoints.  */
269
 
270
  /* Note that zero is a perfectly valid code address on some platforms
271
     (for example, the mn10200 (OBSOLETE) and mn10300 simulators).  NULL
272
     is not a special value for this field.  Valid for all types except
273
     bp_loc_other.  */
274
  CORE_ADDR address;
275
 
276
  /* For hardware watchpoints, the size of data ad ADDRESS being watches.  */
277
  int length;
278
 
279
  /* Type of hardware watchpoint. */
280
  enum target_hw_bp_type watchpoint_type;
281
 
282
  /* For any breakpoint type with an address, this is the BFD section
283
     associated with the address.  Used primarily for overlay debugging.  */
284
  asection *section;
285
 
286
  /* Address at which breakpoint was requested, either by the user or
287
     by GDB for internal breakpoints.  This will usually be the same
288
     as ``address'' (above) except for cases in which
289
     ADJUST_BREAKPOINT_ADDRESS has computed a different address at
290
     which to place the breakpoint in order to comply with a
291
     processor's architectual constraints.  */
292
  CORE_ADDR requested_address;
293
 
294
  char *function_name;
295
 
296
  /* Details of the placed breakpoint, when inserted.  */
297
  struct bp_target_info target_info;
298
 
299
  /* Similarly, for the breakpoint at an overlay's LMA, if necessary.  */
300
  struct bp_target_info overlay_target_info;
301
};
302
 
303
/* This structure is a collection of function pointers that, if available,
304
   will be called instead of the performing the default action for this
305
   bptype.  */
306
 
307
struct breakpoint_ops
308
{
309
  /* The normal print routine for this breakpoint, called when we
310
     hit it.  */
311
  enum print_stop_action (*print_it) (struct breakpoint *);
312
 
313
  /* Display information about this breakpoint, for "info breakpoints".  */
314
  void (*print_one) (struct breakpoint *, CORE_ADDR *);
315
 
316
  /* Display information about this breakpoint after setting it (roughly
317
     speaking; this is called from "mention").  */
318
  void (*print_mention) (struct breakpoint *);
319
};
320
 
321
enum watchpoint_triggered
322
{
323
  /* This watchpoint definitely did not trigger.  */
324
  watch_triggered_no = 0,
325
 
326
  /* Some hardware watchpoint triggered, and it might have been this
327
     one, but we do not know which it was.  */
328
  watch_triggered_unknown,
329
 
330
  /* This hardware watchpoint definitely did trigger.  */
331
  watch_triggered_yes
332
};
333
 
334
/* Note that the ->silent field is not currently used by any commands
335
   (though the code is in there if it was to be, and set_raw_breakpoint
336
   does set it to 0).  I implemented it because I thought it would be
337
   useful for a hack I had to put in; I'm going to leave it in because
338
   I can see how there might be times when it would indeed be useful */
339
 
340
/* This is for a breakpoint or a watchpoint.  */
341
 
342
struct breakpoint
343
  {
344
    struct breakpoint *next;
345
    /* Type of breakpoint. */
346
    enum bptype type;
347
    /* Zero means disabled; remember the info but don't break here.  */
348
    enum enable_state enable_state;
349
    /* What to do with this breakpoint after we hit it. */
350
    enum bpdisp disposition;
351
    /* Number assigned to distinguish breakpoints.  */
352
    int number;
353
 
354
    /* Location(s) associated with this high-level breakpoint.  */
355
    struct bp_location *loc;
356
 
357
    /* Line number of this address.  */
358
 
359
    int line_number;
360
 
361
    /* Source file name of this address.  */
362
 
363
    char *source_file;
364
 
365
    /* Non-zero means a silent breakpoint (don't print frame info
366
       if we stop here). */
367
    unsigned char silent;
368
    /* Number of stops at this breakpoint that should
369
       be continued automatically before really stopping.  */
370
    int ignore_count;
371
    /* Chain of command lines to execute when this breakpoint is hit.  */
372
    struct command_line *commands;
373
    /* Stack depth (address of frame).  If nonzero, break only if fp
374
       equals this.  */
375
    struct frame_id frame_id;
376
 
377
    /* String we used to set the breakpoint (malloc'd).  */
378
    char *addr_string;
379
    /* Language we used to set the breakpoint.  */
380
    enum language language;
381
    /* Input radix we used to set the breakpoint.  */
382
    int input_radix;
383
    /* String form of the breakpoint condition (malloc'd), or NULL if there
384
       is no condition.  */
385
    char *cond_string;
386
    /* String form of exp (malloc'd), or NULL if none.  */
387
    char *exp_string;
388
 
389
    /* The expression we are watching, or NULL if not a watchpoint.  */
390
    struct expression *exp;
391
    /* The largest block within which it is valid, or NULL if it is
392
       valid anywhere (e.g. consists just of global symbols).  */
393
    struct block *exp_valid_block;
394
    /* Value of the watchpoint the last time we checked it.  */
395
    struct value *val;
396
 
397
    /* Holds the address of the related watchpoint_scope breakpoint
398
       when using watchpoints on local variables (might the concept
399
       of a related breakpoint be useful elsewhere, if not just call
400
       it the watchpoint_scope breakpoint or something like that. FIXME).  */
401
    struct breakpoint *related_breakpoint;
402
 
403
    /* Holds the frame address which identifies the frame this
404
       watchpoint should be evaluated in, or `null' if the watchpoint
405
       should be evaluated on the outermost frame.  */
406
    struct frame_id watchpoint_frame;
407
 
408
    /* For hardware watchpoints, the triggered status according to the
409
       hardware.  */
410
    enum watchpoint_triggered watchpoint_triggered;
411
 
412
    /* Thread number for thread-specific breakpoint, or -1 if don't care */
413
    int thread;
414
 
415
    /* Count of the number of times this breakpoint was taken, dumped
416
       with the info, but not used for anything else.  Useful for
417
       seeing how many times you hit a break prior to the program
418
       aborting, so you can back up to just before the abort.  */
419
    int hit_count;
420
 
421
    /* Filename of a dynamically-linked library (dll), used for
422
       bp_catch_load and bp_catch_unload (malloc'd), or NULL if any
423
       library is significant.  */
424
    char *dll_pathname;
425
 
426
    /* Filename of a dll whose state change (e.g., load or unload)
427
       triggered this catchpoint.  This field is only valid immediately
428
       after this catchpoint has triggered.  */
429
    char *triggered_dll_pathname;
430
 
431
    /* Process id of a child process whose forking triggered this
432
       catchpoint.  This field is only valid immediately after this
433
       catchpoint has triggered.  */
434
    int forked_inferior_pid;
435
 
436
    /* Filename of a program whose exec triggered this catchpoint.
437
       This field is only valid immediately after this catchpoint has
438
       triggered.  */
439
    char *exec_pathname;
440
 
441
    /* Methods associated with this breakpoint.  */
442
    struct breakpoint_ops *ops;
443
 
444
    /* Is breakpoint's condition not yet parsed because we found
445
       no location initially so had no context to parse
446
       the condition in.  */
447
    int condition_not_parsed;
448
  };
449
 
450
typedef struct breakpoint *breakpoint_p;
451
DEF_VEC_P(breakpoint_p);
452
 
453
/* The following stuff is an abstract data type "bpstat" ("breakpoint
454
   status").  This provides the ability to determine whether we have
455
   stopped at a breakpoint, and what we should do about it.  */
456
 
457
typedef struct bpstats *bpstat;
458
 
459
/* Frees any storage that is part of a bpstat.
460
   Does not walk the 'next' chain.  */
461
extern void bpstat_free (bpstat);
462
 
463
/* Clears a chain of bpstat, freeing storage
464
   of each.  */
465
extern void bpstat_clear (bpstat *);
466
 
467
/* Return a copy of a bpstat.  Like "bs1 = bs2" but all storage that
468
   is part of the bpstat is copied as well.  */
469
extern bpstat bpstat_copy (bpstat);
470
 
471
extern bpstat bpstat_stop_status (CORE_ADDR pc, ptid_t ptid);
472
 
473
/* This bpstat_what stuff tells wait_for_inferior what to do with a
474
   breakpoint (a challenging task).  */
475
 
476
enum bpstat_what_main_action
477
  {
478
    /* Perform various other tests; that is, this bpstat does not
479
       say to perform any action (e.g. failed watchpoint and nothing
480
       else).  */
481
    BPSTAT_WHAT_KEEP_CHECKING,
482
 
483
    /* Rather than distinguish between noisy and silent stops here, it
484
       might be cleaner to have bpstat_print make that decision (also
485
       taking into account stop_print_frame and source_only).  But the
486
       implications are a bit scary (interaction with auto-displays, etc.),
487
       so I won't try it.  */
488
 
489
    /* Stop silently.  */
490
    BPSTAT_WHAT_STOP_SILENT,
491
 
492
    /* Stop and print.  */
493
    BPSTAT_WHAT_STOP_NOISY,
494
 
495
    /* Remove breakpoints, single step once, then put them back in and
496
       go back to what we were doing.  It's possible that this should be
497
       removed from the main_action and put into a separate field, to more
498
       cleanly handle BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE.  */
499
    BPSTAT_WHAT_SINGLE,
500
 
501
    /* Set longjmp_resume breakpoint, remove all other breakpoints,
502
       and continue.  The "remove all other breakpoints" part is required
503
       if we are also stepping over another breakpoint as well as doing
504
       the longjmp handling.  */
505
    BPSTAT_WHAT_SET_LONGJMP_RESUME,
506
 
507
    /* Clear longjmp_resume breakpoint, then handle as
508
       BPSTAT_WHAT_KEEP_CHECKING.  */
509
    BPSTAT_WHAT_CLEAR_LONGJMP_RESUME,
510
 
511
    /* Clear longjmp_resume breakpoint, then handle as BPSTAT_WHAT_SINGLE.  */
512
    BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE,
513
 
514
    /* Clear step resume breakpoint, and keep checking.  */
515
    BPSTAT_WHAT_STEP_RESUME,
516
 
517
    /* Check the dynamic linker's data structures for new libraries, then
518
       keep checking.  */
519
    BPSTAT_WHAT_CHECK_SHLIBS,
520
 
521
    /* Check the dynamic linker's data structures for new libraries, then
522
       resume out of the dynamic linker's callback, stop and print.  */
523
    BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK,
524
 
525
    /* This is just used to keep track of how many enums there are.  */
526
    BPSTAT_WHAT_LAST
527
  };
528
 
529
struct bpstat_what
530
  {
531
    enum bpstat_what_main_action main_action;
532
 
533
    /* Did we hit a call dummy breakpoint?  This only goes with a main_action
534
       of BPSTAT_WHAT_STOP_SILENT or BPSTAT_WHAT_STOP_NOISY (the concept of
535
       continuing from a call dummy without popping the frame is not a
536
       useful one).  */
537
    int call_dummy;
538
  };
539
 
540
/* The possible return values for print_bpstat, print_it_normal,
541
   print_it_done, print_it_noop. */
542
enum print_stop_action
543
  {
544
    PRINT_UNKNOWN = -1,
545
    PRINT_SRC_AND_LOC,
546
    PRINT_SRC_ONLY,
547
    PRINT_NOTHING
548
  };
549
 
550
/* Tell what to do about this bpstat.  */
551
struct bpstat_what bpstat_what (bpstat);
552
 
553
/* Find the bpstat associated with a breakpoint.  NULL otherwise. */
554
bpstat bpstat_find_breakpoint (bpstat, struct breakpoint *);
555
 
556
/* Find a step_resume breakpoint associated with this bpstat.
557
   (If there are multiple step_resume bp's on the list, this function
558
   will arbitrarily pick one.)
559
 
560
   It is an error to use this function if BPSTAT doesn't contain a
561
   step_resume breakpoint.
562
 
563
   See wait_for_inferior's use of this function.
564
 */
565
extern struct breakpoint *bpstat_find_step_resume_breakpoint (bpstat);
566
 
567
/* Nonzero if a signal that we got in wait() was due to circumstances
568
   explained by the BS.  */
569
/* Currently that is true if we have hit a breakpoint, or if there is
570
   a watchpoint enabled.  */
571
#define bpstat_explains_signal(bs) ((bs) != NULL)
572
 
573
/* Nonzero if we should step constantly (e.g. watchpoints on machines
574
   without hardware support).  This isn't related to a specific bpstat,
575
   just to things like whether watchpoints are set.  */
576
extern int bpstat_should_step (void);
577
 
578
/* Print a message indicating what happened.  Returns nonzero to
579
   say that only the source line should be printed after this (zero
580
   return means print the frame as well as the source line).  */
581
extern enum print_stop_action bpstat_print (bpstat);
582
 
583
/* Put in *NUM the breakpoint number of the first breakpoint we are stopped
584
   at.  *BSP upon return is a bpstat which points to the remaining
585
   breakpoints stopped at (but which is not guaranteed to be good for
586
   anything but further calls to bpstat_num).
587
   Return 0 if passed a bpstat which does not indicate any breakpoints.
588
   Return -1 if stopped at a breakpoint that has been deleted since
589
   we set it.
590
   Return 1 otherwise.  */
591
extern int bpstat_num (bpstat *, int *);
592
 
593
/* Perform actions associated with having stopped at *BSP.  Actually, we just
594
   use this for breakpoint commands.  Perhaps other actions will go here
595
   later, but this is executed at a late time (from the command loop).  */
596
extern void bpstat_do_actions (bpstat *);
597
 
598
/* Modify BS so that the actions will not be performed.  */
599
extern void bpstat_clear_actions (bpstat);
600
 
601
/* Given a bpstat that records zero or more triggered eventpoints, this
602
   function returns another bpstat which contains only the catchpoints
603
   on that first list, if any.
604
 */
605
extern void bpstat_get_triggered_catchpoints (bpstat, bpstat *);
606
 
607
/* Implementation:  */
608
 
609
/* Values used to tell the printing routine how to behave for this bpstat. */
610
enum bp_print_how
611
  {
612
    /* This is used when we want to do a normal printing of the reason
613
       for stopping. The output will depend on the type of eventpoint
614
       we are dealing with. This is the default value, most commonly
615
       used. */
616
    print_it_normal,
617
    /* This is used when nothing should be printed for this bpstat entry.  */
618
    print_it_noop,
619
    /* This is used when everything which needs to be printed has
620
       already been printed.  But we still want to print the frame.  */
621
    print_it_done
622
  };
623
 
624
struct bpstats
625
  {
626
    /* Linked list because there can be two breakpoints at the same
627
       place, and a bpstat reflects the fact that both have been hit.  */
628
    bpstat next;
629
    /* Breakpoint that we are at.  */
630
    const struct bp_location *breakpoint_at;
631
    /* Commands left to be done.  */
632
    struct command_line *commands;
633
    /* Old value associated with a watchpoint.  */
634
    struct value *old_val;
635
 
636
    /* Nonzero if this breakpoint tells us to print the frame.  */
637
    char print;
638
 
639
    /* Nonzero if this breakpoint tells us to stop.  */
640
    char stop;
641
 
642
    /* Tell bpstat_print and print_bp_stop_message how to print stuff
643
       associated with this element of the bpstat chain.  */
644
    enum bp_print_how print_it;
645
  };
646
 
647
enum inf_context
648
  {
649
    inf_starting,
650
    inf_running,
651
    inf_exited
652
  };
653
 
654
/* The possible return values for breakpoint_here_p.
655
   We guarantee that zero always means "no breakpoint here".  */
656
enum breakpoint_here
657
  {
658
    no_breakpoint_here = 0,
659
    ordinary_breakpoint_here,
660
    permanent_breakpoint_here
661
  };
662
 
663
 
664
/* Prototypes for breakpoint-related functions.  */
665
 
666
extern enum breakpoint_here breakpoint_here_p (CORE_ADDR);
667
 
668
extern int breakpoint_inserted_here_p (CORE_ADDR);
669
 
670
extern int regular_breakpoint_inserted_here_p (CORE_ADDR);
671
 
672
extern int software_breakpoint_inserted_here_p (CORE_ADDR);
673
 
674
extern int breakpoint_thread_match (CORE_ADDR, ptid_t);
675
 
676
extern void until_break_command (char *, int, int);
677
 
678
extern void breakpoint_re_set (void);
679
 
680
extern void breakpoint_re_set_thread (struct breakpoint *);
681
 
682
extern int ep_is_exception_catchpoint (struct breakpoint *);
683
 
684
extern struct breakpoint *set_momentary_breakpoint
685
  (struct symtab_and_line, struct frame_id, enum bptype);
686
 
687
extern void set_ignore_count (int, int, int);
688
 
689
extern void set_default_breakpoint (int, CORE_ADDR, struct symtab *, int);
690
 
691
extern void breakpoint_init_inferior (enum inf_context);
692
 
693
extern struct cleanup *make_cleanup_delete_breakpoint (struct breakpoint *);
694
 
695
extern struct cleanup *make_exec_cleanup_delete_breakpoint (struct breakpoint *);
696
 
697
extern void delete_breakpoint (struct breakpoint *);
698
 
699
extern void breakpoint_auto_delete (bpstat);
700
 
701
extern void breakpoint_clear_ignore_counts (void);
702
 
703
extern void break_command (char *, int);
704
 
705
extern void hbreak_command_wrapper (char *, int);
706
extern void thbreak_command_wrapper (char *, int);
707
extern void rbreak_command_wrapper (char *, int);
708
extern void watch_command_wrapper (char *, int);
709
extern void awatch_command_wrapper (char *, int);
710
extern void rwatch_command_wrapper (char *, int);
711
extern void tbreak_command (char *, int);
712
 
713
extern void set_breakpoint (char *address, char *condition,
714
                            int hardwareflag, int tempflag,
715
                            int thread, int ignore_count,
716
                            int pending);
717
 
718
extern void insert_breakpoints (void);
719
 
720
extern int remove_breakpoints (void);
721
 
722
/* This function can be used to physically insert eventpoints from the
723
   specified traced inferior process, without modifying the breakpoint
724
   package's state.  This can be useful for those targets which support
725
   following the processes of a fork() or vfork() system call, when both
726
   of the resulting two processes are to be followed.  */
727
extern int reattach_breakpoints (int);
728
 
729
/* This function can be used to update the breakpoint package's state
730
   after an exec() system call has been executed.
731
 
732
   This function causes the following:
733
 
734
   - All eventpoints are marked "not inserted".
735
   - All eventpoints with a symbolic address are reset such that
736
   the symbolic address must be reevaluated before the eventpoints
737
   can be reinserted.
738
   - The solib breakpoints are explicitly removed from the breakpoint
739
   list.
740
   - A step-resume breakpoint, if any, is explicitly removed from the
741
   breakpoint list.
742
   - All eventpoints without a symbolic address are removed from the
743
   breakpoint list. */
744
extern void update_breakpoints_after_exec (void);
745
 
746
/* This function can be used to physically remove hardware breakpoints
747
   and watchpoints from the specified traced inferior process, without
748
   modifying the breakpoint package's state.  This can be useful for
749
   those targets which support following the processes of a fork() or
750
   vfork() system call, when one of the resulting two processes is to
751
   be detached and allowed to run free.
752
 
753
   It is an error to use this function on the process whose id is
754
   inferior_ptid.  */
755
extern int detach_breakpoints (int);
756
 
757
extern void enable_longjmp_breakpoint (void);
758
extern void disable_longjmp_breakpoint (void);
759
extern void enable_overlay_breakpoints (void);
760
extern void disable_overlay_breakpoints (void);
761
 
762
extern void set_longjmp_resume_breakpoint (CORE_ADDR, struct frame_id);
763
/* These functions respectively disable or reenable all currently
764
   enabled watchpoints.  When disabled, the watchpoints are marked
765
   call_disabled.  When reenabled, they are marked enabled.
766
 
767
   The intended client of these functions is call_function_by_hand.
768
 
769
   The inferior must be stopped, and all breakpoints removed, when
770
   these functions are used.
771
 
772
   The need for these functions is that on some targets (e.g., HP-UX),
773
   gdb is unable to unwind through the dummy frame that is pushed as
774
   part of the implementation of a call command.  Watchpoints can
775
   cause the inferior to stop in places where this frame is visible,
776
   and that can cause execution control to become very confused.
777
 
778
   Note that if a user sets breakpoints in an interactively called
779
   function, the call_disabled watchpoints will have been reenabled
780
   when the first such breakpoint is reached.  However, on targets
781
   that are unable to unwind through the call dummy frame, watches
782
   of stack-based storage may then be deleted, because gdb will
783
   believe that their watched storage is out of scope.  (Sigh.) */
784
extern void disable_watchpoints_before_interactive_call_start (void);
785
 
786
extern void enable_watchpoints_after_interactive_call_stop (void);
787
 
788
/* For script interpreters that need to define breakpoint commands
789
   after they've already read the commands into a struct command_line.  */
790
extern enum command_control_type commands_from_control_command
791
  (char *arg, struct command_line *cmd);
792
 
793
extern void clear_breakpoint_hit_counts (void);
794
 
795
extern int get_number (char **);
796
 
797
extern int get_number_or_range (char **);
798
 
799
/* The following are for displays, which aren't really breakpoints, but
800
   here is as good a place as any for them.  */
801
 
802
extern void disable_current_display (void);
803
 
804
extern void do_displays (void);
805
 
806
extern void disable_display (int);
807
 
808
extern void clear_displays (void);
809
 
810
extern void disable_breakpoint (struct breakpoint *);
811
 
812
extern void enable_breakpoint (struct breakpoint *);
813
 
814
extern void make_breakpoint_permanent (struct breakpoint *);
815
 
816
extern struct breakpoint *create_solib_event_breakpoint (CORE_ADDR);
817
 
818
extern struct breakpoint *create_thread_event_breakpoint (CORE_ADDR);
819
 
820
extern void remove_solib_event_breakpoints (void);
821
 
822
extern void remove_thread_event_breakpoints (void);
823
 
824
extern void disable_breakpoints_in_shlibs (void);
825
 
826
/* This function returns TRUE if ep is a catchpoint. */
827
extern int ep_is_catchpoint (struct breakpoint *);
828
 
829
/* This function returns TRUE if ep is a catchpoint of a
830
   shared library (aka dynamically-linked library) event,
831
   such as a library load or unload. */
832
extern int ep_is_shlib_catchpoint (struct breakpoint *);
833
 
834
/* Enable breakpoints and delete when hit.  Called with ARG == NULL
835
   deletes all breakpoints. */
836
extern void delete_command (char *arg, int from_tty);
837
 
838
/* Pull all H/W watchpoints from the target. Return non-zero if the
839
   remove fails. */
840
extern int remove_hw_watchpoints (void);
841
 
842
/* Manage a software single step breakpoint (or two).  Insert may be called
843
   twice before remove is called.  */
844
extern void insert_single_step_breakpoint (CORE_ADDR);
845
extern void remove_single_step_breakpoints (void);
846
 
847
/* Manage manual breakpoints, separate from the normal chain of
848
   breakpoints.  These functions are used in murky target-specific
849
   ways.  Please do not add more uses!  */
850
extern void *deprecated_insert_raw_breakpoint (CORE_ADDR);
851
extern int deprecated_remove_raw_breakpoint (void *);
852
 
853
/* Check if any hardware watchpoints have triggered, according to the
854
   target.  */
855
int watchpoints_triggered (struct target_waitstatus *);
856
 
857
#endif /* !defined (BREAKPOINT_H) */

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