gdb/breakpoint.h

   1 /* Data structures associated with breakpoints in GDB.
   2    Copyright (C) 1992, 93, 94, 95, 96, 98, 1999 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #if !defined (BREAKPOINT_H)
  22 #define BREAKPOINT_H 1
  23
  24 #include "frame.h"
  25 #include "value.h"
  26
  27 #include "gdb-events.h"
  28
  29 /* This is the maximum number of bytes a breakpoint instruction can take.
  30    Feel free to increase it.  It's just used in a few places to size
  31    arrays that should be independent of the target architecture.  */
  32
  33 #define BREAKPOINT_MAX  16
  34 \f
  35 /* Type of breakpoint. */
  36 /* FIXME In the future, we should fold all other breakpoint-like things into
  37    here.  This includes:
  38
  39    * single-step (for machines where we have to simulate single stepping)
  40    (probably, though perhaps it is better for it to look as much as
  41    possible like a single-step to wait_for_inferior).  */
  42
  43 enum bptype
  44   {
  45     bp_none = 0,                /* Eventpoint has been deleted. */
  46     bp_breakpoint,              /* Normal breakpoint */
  47     bp_hardware_breakpoint,     /* Hardware assisted breakpoint */
  48     bp_until,                   /* used by until command */
  49     bp_finish,                  /* used by finish command */
  50     bp_watchpoint,              /* Watchpoint */
  51     bp_hardware_watchpoint,     /* Hardware assisted watchpoint */
  52     bp_read_watchpoint,         /* read watchpoint, (hardware assisted) */
  53     bp_access_watchpoint,       /* access watchpoint, (hardware assisted) */
  54     bp_longjmp,                 /* secret breakpoint to find longjmp() */
  55     bp_longjmp_resume,          /* secret breakpoint to escape longjmp() */
  56
  57     /* Used by wait_for_inferior for stepping over subroutine calls, for
  58        stepping over signal handlers, and for skipping prologues.  */
  59     bp_step_resume,
  60
  61     /* Used by wait_for_inferior for stepping over signal handlers.  */
  62     bp_through_sigtramp,
  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     /* These breakpoints are used to implement the "catch load" command
  98        on platforms whose dynamic linkers support such functionality.  */
  99     bp_catch_load,
 100
 101     /* These breakpoints are used to implement the "catch unload" command
 102        on platforms whose dynamic linkers support such functionality.  */
 103     bp_catch_unload,
 104
 105     /* These are not really breakpoints, but are catchpoints that
 106        implement the "catch fork", "catch vfork" and "catch exec" commands
 107        on platforms whose kernel support such functionality.  (I.e.,
 108        kernels which can raise an event when a fork or exec occurs, as
 109        opposed to the debugger setting breakpoints on functions named
 110        "fork" or "exec".) */
 111     bp_catch_fork,
 112     bp_catch_vfork,
 113     bp_catch_exec,
 114
 115     /* These are catchpoints to implement "catch catch" and "catch throw"
 116        commands for C++ exception handling. */
 117     bp_catch_catch,
 118     bp_catch_throw
 119
 120
 121   };
 122
 123 /* States of enablement of breakpoint. */
 124
 125 enum enable
 126   {
 127     disabled,           /* The eventpoint is inactive, and cannot trigger. */
 128     enabled,            /* The eventpoint is active, and can trigger. */
 129     shlib_disabled,     /* The eventpoint's address is in an unloaded solib.
 130                            The eventpoint will be automatically enabled
 131                            and reset when that solib is loaded. */
 132     call_disabled,      /* The eventpoint has been disabled while a call
 133                            into the inferior is "in flight", because some
 134                            eventpoints interfere with the implementation of
 135                            a call on some targets.  The eventpoint will be
 136                            automatically enabled and reset when the call
 137                            "lands" (either completes, or stops at another
 138                            eventpoint). */
 139     permanent           /* There is a breakpoint instruction hard-wired into
 140                            the target's code.  Don't try to write another
 141                            breakpoint instruction on top of it, or restore
 142                            its value.  Step over it using the architecture's
 143                            SKIP_INSN macro.  */
 144   };
 145
 146
 147 /* Disposition of breakpoint.  Ie: what to do after hitting it. */
 148
 149 enum bpdisp
 150   {
 151     del,                        /* Delete it */
 152     del_at_next_stop,           /* Delete at next stop, whether hit or not */
 153     disable,                    /* Disable it */
 154     donttouch                   /* Leave it alone */
 155   };
 156
 157 enum target_hw_bp_type
 158   {
 159     hw_write   = 0,             /* Common  HW watchpoint */
 160     hw_read    = 1,             /* Read    HW watchpoint */
 161     hw_access  = 2,             /* Access  HW watchpoint */
 162     hw_execute = 3              /* Execute HW breakpoint */
 163   };
 164
 165 /* Note that the ->silent field is not currently used by any commands
 166    (though the code is in there if it was to be, and set_raw_breakpoint
 167    does set it to 0).  I implemented it because I thought it would be
 168    useful for a hack I had to put in; I'm going to leave it in because
 169    I can see how there might be times when it would indeed be useful */
 170
 171 /* This is for a breakpoint or a watchpoint.  */
 172
 173 struct breakpoint
 174   {
 175     struct breakpoint *next;
 176     /* Type of breakpoint. */
 177     enum bptype type;
 178     /* Zero means disabled; remember the info but don't break here.  */
 179     enum enable enable;
 180     /* What to do with this breakpoint after we hit it. */
 181     enum bpdisp disposition;
 182     /* Number assigned to distinguish breakpoints.  */
 183     int number;
 184
 185     /* Address to break at, or NULL if not a breakpoint.  */
 186     CORE_ADDR address;
 187
 188     /* Line number of this address.  Only matters if address is
 189        non-NULL.  */
 190
 191     int line_number;
 192
 193     /* Source file name of this address.  Only matters if address is
 194        non-NULL.  */
 195
 196     char *source_file;
 197
 198     /* Non-zero means a silent breakpoint (don't print frame info
 199        if we stop here). */
 200     unsigned char silent;
 201     /* Number of stops at this breakpoint that should
 202        be continued automatically before really stopping.  */
 203     int ignore_count;
 204     /* "Real" contents of byte where breakpoint has been inserted.
 205        Valid only when breakpoints are in the program.  Under the complete
 206        control of the target insert_breakpoint and remove_breakpoint routines.
 207        No other code should assume anything about the value(s) here.  */
 208     char shadow_contents[BREAKPOINT_MAX];
 209     /* Nonzero if this breakpoint is now inserted.  Only matters if address
 210        is non-NULL.  */
 211     char inserted;
 212     /* Nonzero if this is not the first breakpoint in the list
 213        for the given address.  Only matters if address is non-NULL.  */
 214     char duplicate;
 215     /* Chain of command lines to execute when this breakpoint is hit.  */
 216     struct command_line *commands;
 217     /* Stack depth (address of frame).  If nonzero, break only if fp
 218        equals this.  */
 219     CORE_ADDR frame;
 220     /* Conditional.  Break only if this expression's value is nonzero.  */
 221     struct expression *cond;
 222
 223     /* String we used to set the breakpoint (malloc'd).  Only matters if
 224        address is non-NULL.  */
 225     char *addr_string;
 226     /* Language we used to set the breakpoint.  */
 227     enum language language;
 228     /* Input radix we used to set the breakpoint.  */
 229     int input_radix;
 230     /* String form of the breakpoint condition (malloc'd), or NULL if there
 231        is no condition.  */
 232     char *cond_string;
 233     /* String form of exp (malloc'd), or NULL if none.  */
 234     char *exp_string;
 235
 236     /* The expression we are watching, or NULL if not a watchpoint.  */
 237     struct expression *exp;
 238     /* The largest block within which it is valid, or NULL if it is
 239        valid anywhere (e.g. consists just of global symbols).  */
 240     struct block *exp_valid_block;
 241     /* Value of the watchpoint the last time we checked it.  */
 242     value_ptr val;
 243
 244     /* Holds the value chain for a hardware watchpoint expression.  */
 245     value_ptr val_chain;
 246
 247     /* Holds the address of the related watchpoint_scope breakpoint
 248        when using watchpoints on local variables (might the concept
 249        of a related breakpoint be useful elsewhere, if not just call
 250        it the watchpoint_scope breakpoint or something like that. FIXME).  */
 251     struct breakpoint *related_breakpoint;
 252
 253     /* Holds the frame address which identifies the frame this watchpoint
 254        should be evaluated in, or NULL if the watchpoint should be evaluated
 255        on the outermost frame.  */
 256     CORE_ADDR watchpoint_frame;
 257
 258     /* Thread number for thread-specific breakpoint, or -1 if don't care */
 259     int thread;
 260
 261     /* Count of the number of times this breakpoint was taken, dumped
 262        with the info, but not used for anything else.  Useful for
 263        seeing how many times you hit a break prior to the program
 264        aborting, so you can back up to just before the abort.  */
 265     int hit_count;
 266
 267     /* Filename of a dynamically-linked library (dll), used for
 268        bp_catch_load and bp_catch_unload (malloc'd), or NULL if any
 269        library is significant.  */
 270     char *dll_pathname;
 271
 272     /* Filename of a dll whose state change (e.g., load or unload)
 273        triggered this catchpoint.  This field is only vaid immediately
 274        after this catchpoint has triggered.  */
 275     char *triggered_dll_pathname;
 276
 277     /* Process id of a child process whose forking triggered this
 278        catchpoint.  This field is only vaid immediately after this
 279        catchpoint has triggered.  */
 280     int forked_inferior_pid;
 281
 282     /* Filename of a program whose exec triggered this catchpoint.
 283        This field is only vaid immediately after this catchpoint has
 284        triggered.  */
 285     char *exec_pathname;
 286
 287     asection *section;
 288   };
 289 \f
 290 /* The following stuff is an abstract data type "bpstat" ("breakpoint
 291    status").  This provides the ability to determine whether we have
 292    stopped at a breakpoint, and what we should do about it.  */
 293
 294 typedef struct bpstats *bpstat;
 295
 296 /* Interface:  */
 297 /* Clear a bpstat so that it says we are not at any breakpoint.
 298    Also free any storage that is part of a bpstat.  */
 299 extern void bpstat_clear PARAMS ((bpstat *));
 300
 301 /* Return a copy of a bpstat.  Like "bs1 = bs2" but all storage that
 302    is part of the bpstat is copied as well.  */
 303 extern bpstat bpstat_copy PARAMS ((bpstat));
 304
 305 extern bpstat bpstat_stop_status PARAMS ((CORE_ADDR *, int));
 306 \f
 307 /* This bpstat_what stuff tells wait_for_inferior what to do with a
 308    breakpoint (a challenging task).  */
 309
 310 enum bpstat_what_main_action
 311   {
 312     /* Perform various other tests; that is, this bpstat does not
 313        say to perform any action (e.g. failed watchpoint and nothing
 314        else).  */
 315     BPSTAT_WHAT_KEEP_CHECKING,
 316
 317     /* Rather than distinguish between noisy and silent stops here, it
 318        might be cleaner to have bpstat_print make that decision (also
 319        taking into account stop_print_frame and source_only).  But the
 320        implications are a bit scary (interaction with auto-displays, etc.),
 321        so I won't try it.  */
 322
 323     /* Stop silently.  */
 324     BPSTAT_WHAT_STOP_SILENT,
 325
 326     /* Stop and print.  */
 327     BPSTAT_WHAT_STOP_NOISY,
 328
 329     /* Remove breakpoints, single step once, then put them back in and
 330        go back to what we were doing.  It's possible that this should be
 331        removed from the main_action and put into a separate field, to more
 332        cleanly handle BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE.  */
 333     BPSTAT_WHAT_SINGLE,
 334
 335     /* Set longjmp_resume breakpoint, remove all other breakpoints,
 336        and continue.  The "remove all other breakpoints" part is required
 337        if we are also stepping over another breakpoint as well as doing
 338        the longjmp handling.  */
 339     BPSTAT_WHAT_SET_LONGJMP_RESUME,
 340
 341     /* Clear longjmp_resume breakpoint, then handle as
 342        BPSTAT_WHAT_KEEP_CHECKING.  */
 343     BPSTAT_WHAT_CLEAR_LONGJMP_RESUME,
 344
 345     /* Clear longjmp_resume breakpoint, then handle as BPSTAT_WHAT_SINGLE.  */
 346     BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE,
 347
 348     /* Clear step resume breakpoint, and keep checking.  */
 349     BPSTAT_WHAT_STEP_RESUME,
 350
 351     /* Clear through_sigtramp breakpoint, muck with trap_expected, and keep
 352        checking.  */
 353     BPSTAT_WHAT_THROUGH_SIGTRAMP,
 354
 355     /* Check the dynamic linker's data structures for new libraries, then
 356        keep checking.  */
 357     BPSTAT_WHAT_CHECK_SHLIBS,
 358
 359     /* Check the dynamic linker's data structures for new libraries, then
 360        resume out of the dynamic linker's callback, stop and print.  */
 361     BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK,
 362
 363     /* This is just used to keep track of how many enums there are.  */
 364     BPSTAT_WHAT_LAST
 365   };
 366
 367 struct bpstat_what
 368   {
 369     enum bpstat_what_main_action main_action;
 370
 371     /* Did we hit a call dummy breakpoint?  This only goes with a main_action
 372        of BPSTAT_WHAT_STOP_SILENT or BPSTAT_WHAT_STOP_NOISY (the concept of
 373        continuing from a call dummy without popping the frame is not a
 374        useful one).  */
 375     int call_dummy;
 376   };
 377
 378 /* Tell what to do about this bpstat.  */
 379 struct bpstat_what bpstat_what PARAMS ((bpstat));
 380 \f
 381 /* Find the bpstat associated with a breakpoint.  NULL otherwise. */
 382 bpstat bpstat_find_breakpoint PARAMS ((bpstat, struct breakpoint *));
 383
 384 /* Find a step_resume breakpoint associated with this bpstat.
 385    (If there are multiple step_resume bp's on the list, this function
 386    will arbitrarily pick one.)
 387
 388    It is an error to use this function if BPSTAT doesn't contain a
 389    step_resume breakpoint.
 390
 391    See wait_for_inferior's use of this function.
 392  */
 393 extern struct breakpoint *
 394   bpstat_find_step_resume_breakpoint PARAMS ((bpstat));
 395
 396 /* Nonzero if a signal that we got in wait() was due to circumstances
 397    explained by the BS.  */
 398 /* Currently that is true if we have hit a breakpoint, or if there is
 399    a watchpoint enabled.  */
 400 #define bpstat_explains_signal(bs) ((bs) != NULL)
 401
 402 /* Nonzero if we should step constantly (e.g. watchpoints on machines
 403    without hardware support).  This isn't related to a specific bpstat,
 404    just to things like whether watchpoints are set.  */
 405 extern int bpstat_should_step PARAMS ((void));
 406
 407 /* Nonzero if there are enabled hardware watchpoints. */
 408 extern int bpstat_have_active_hw_watchpoints PARAMS ((void));
 409
 410 /* Print a message indicating what happened.  Returns nonzero to
 411    say that only the source line should be printed after this (zero
 412    return means print the frame as well as the source line).  */
 413 extern int bpstat_print PARAMS ((bpstat));
 414
 415 /* Return the breakpoint number of the first breakpoint we are stopped
 416    at.  *BSP upon return is a bpstat which points to the remaining
 417    breakpoints stopped at (but which is not guaranteed to be good for
 418    anything but further calls to bpstat_num).
 419    Return 0 if passed a bpstat which does not indicate any breakpoints.  */
 420 extern int bpstat_num PARAMS ((bpstat *));
 421
 422 /* Perform actions associated with having stopped at *BSP.  Actually, we just
 423    use this for breakpoint commands.  Perhaps other actions will go here
 424    later, but this is executed at a late time (from the command loop).  */
 425 extern void bpstat_do_actions PARAMS ((bpstat *));
 426
 427 /* Modify BS so that the actions will not be performed.  */
 428 extern void bpstat_clear_actions PARAMS ((bpstat));
 429
 430 /* Given a bpstat that records zero or more triggered eventpoints, this
 431    function returns another bpstat which contains only the catchpoints
 432    on that first list, if any.
 433  */
 434 extern void bpstat_get_triggered_catchpoints PARAMS ((bpstat, bpstat *));
 435
 436 /* Implementation:  */
 437
 438 /* Values used to tell the printing routine how to behave for this bpstat. */
 439 enum bp_print_how
 440   {
 441     /* This is used when we want to do a normal printing of the reason
 442        for stopping. The output will depend on the type of eventpoint
 443        we are dealing with. This is the default value, most commonly
 444        used. */
 445     print_it_normal,
 446     /* This is used when nothing should be printed for this bpstat entry.  */
 447     print_it_noop,
 448     /* This is used when everything which needs to be printed has
 449        already been printed.  But we still want to print the frame.  */
 450     print_it_done
 451   };
 452
 453 struct bpstats
 454   {
 455     /* Linked list because there can be two breakpoints at the same
 456        place, and a bpstat reflects the fact that both have been hit.  */
 457     bpstat next;
 458     /* Breakpoint that we are at.  */
 459     struct breakpoint *breakpoint_at;
 460     /* Commands left to be done.  */
 461     struct command_line *commands;
 462     /* Old value associated with a watchpoint.  */
 463     value_ptr old_val;
 464
 465     /* Nonzero if this breakpoint tells us to print the frame.  */
 466     char print;
 467
 468     /* Nonzero if this breakpoint tells us to stop.  */
 469     char stop;
 470
 471     /* Tell bpstat_print and print_bp_stop_message how to print stuff
 472        associated with this element of the bpstat chain.  */
 473     enum bp_print_how print_it;
 474   };
 475
 476 enum inf_context
 477   {
 478     inf_starting,
 479     inf_running,
 480     inf_exited
 481   };
 482
 483 /* The possible return values for breakpoint_here_p.
 484    We guarantee that zero always means "no breakpoint here".  */
 485 enum breakpoint_here
 486   {
 487     no_breakpoint_here = 0,
 488     ordinary_breakpoint_here,
 489     permanent_breakpoint_here
 490   };
 491
 492 /* The possible return values for print_bpstat, print_it_normal,
 493    print_it_done, print_it_noop. */
 494 enum print_stop_action
 495   {
 496     PRINT_UNKNOWN = -1,
 497     PRINT_SRC_AND_LOC,
 498     PRINT_SRC_ONLY,
 499     PRINT_NOTHING
 500   };
 501 \f
 502
 503 /* Prototypes for breakpoint-related functions.  */
 504
 505 /* Forward declarations for prototypes */
 506 struct frame_info;
 507
 508 extern enum breakpoint_here breakpoint_here_p PARAMS ((CORE_ADDR));
 509
 510 extern int breakpoint_inserted_here_p PARAMS ((CORE_ADDR));
 511
 512 extern int frame_in_dummy PARAMS ((struct frame_info *));
 513
 514 extern int breakpoint_thread_match PARAMS ((CORE_ADDR, int));
 515
 516 extern void until_break_command PARAMS ((char *, int));
 517
 518 extern void breakpoint_re_set PARAMS ((void));
 519
 520 extern void breakpoint_re_set_thread PARAMS ((struct breakpoint *));
 521
 522 extern int ep_is_exception_catchpoint PARAMS ((struct breakpoint *));
 523
 524 extern struct breakpoint *set_momentary_breakpoint
 525   PARAMS ((struct symtab_and_line, struct frame_info *, enum bptype));
 526
 527 extern void set_ignore_count PARAMS ((int, int, int));
 528
 529 extern void set_default_breakpoint PARAMS ((int, CORE_ADDR,
 530                                             struct symtab *, int));
 531
 532 extern void mark_breakpoints_out PARAMS ((void));
 533
 534 extern void breakpoint_init_inferior PARAMS ((enum inf_context));
 535
 536 extern void delete_breakpoint PARAMS ((struct breakpoint *));
 537
 538 extern void breakpoint_auto_delete PARAMS ((bpstat));
 539
 540 extern void breakpoint_clear_ignore_counts PARAMS ((void));
 541
 542 extern void break_command PARAMS ((char *, int));
 543
 544 extern void tbreak_command PARAMS ((char *, int));
 545
 546 extern int insert_breakpoints PARAMS ((void));
 547
 548 extern int remove_breakpoints PARAMS ((void));
 549
 550 /* This function can be used to physically insert eventpoints from the
 551    specified traced inferior process, without modifying the breakpoint
 552    package's state.  This can be useful for those targets which support
 553    following the processes of a fork() or vfork() system call, when both
 554    of the resulting two processes are to be followed.  */
 555 extern int reattach_breakpoints PARAMS ((int));
 556
 557 /* This function can be used to update the breakpoint package's state
 558    after an exec() system call has been executed.
 559
 560    This function causes the following:
 561
 562    - All eventpoints are marked "not inserted".
 563    - All eventpoints with a symbolic address are reset such that
 564    the symbolic address must be reevaluated before the eventpoints
 565    can be reinserted.
 566    - The solib breakpoints are explicitly removed from the breakpoint
 567    list.
 568    - A step-resume breakpoint, if any, is explicitly removed from the
 569    breakpoint list.
 570    - All eventpoints without a symbolic address are removed from the
 571    breakpoint list. */
 572 extern void update_breakpoints_after_exec PARAMS ((void));
 573
 574 /* This function can be used to physically remove hardware breakpoints
 575    and watchpoints from the specified traced inferior process, without
 576    modifying the breakpoint package's state.  This can be useful for
 577    those targets which support following the processes of a fork() or
 578    vfork() system call, when one of the resulting two processes is to
 579    be detached and allowed to run free.
 580
 581    It is an error to use this function on the process whose id is
 582    inferior_pid.  */
 583 extern int detach_breakpoints PARAMS ((int));
 584
 585 extern void enable_longjmp_breakpoint PARAMS ((void));
 586
 587 extern void disable_longjmp_breakpoint PARAMS ((void));
 588
 589 extern void set_longjmp_resume_breakpoint PARAMS ((CORE_ADDR,
 590                                                    struct frame_info *));
 591 /* These functions respectively disable or reenable all currently
 592    enabled watchpoints.  When disabled, the watchpoints are marked
 593    call_disabled.  When reenabled, they are marked enabled.
 594
 595    The intended client of these functions is infcmd.c\run_stack_dummy.
 596
 597    The inferior must be stopped, and all breakpoints removed, when
 598    these functions are used.
 599
 600    The need for these functions is that on some targets (e.g., HP-UX),
 601    gdb is unable to unwind through the dummy frame that is pushed as
 602    part of the implementation of a call command.  Watchpoints can
 603    cause the inferior to stop in places where this frame is visible,
 604    and that can cause execution control to become very confused.
 605
 606    Note that if a user sets breakpoints in an interactively call
 607    function, the call_disabled watchpoints will have been reenabled
 608    when the first such breakpoint is reached.  However, on targets
 609    that are unable to unwind through the call dummy frame, watches
 610    of stack-based storage may then be deleted, because gdb will
 611    believe that their watched storage is out of scope.  (Sigh.) */
 612 extern void
 613 disable_watchpoints_before_interactive_call_start PARAMS ((void));
 614
 615 extern void
 616 enable_watchpoints_after_interactive_call_stop PARAMS ((void));
 617
 618
 619 extern void clear_breakpoint_hit_counts PARAMS ((void));
 620
 621 /* The following are for displays, which aren't really breakpoints, but
 622    here is as good a place as any for them.  */
 623
 624 extern void disable_current_display PARAMS ((void));
 625
 626 extern void do_displays PARAMS ((void));
 627
 628 extern void disable_display PARAMS ((int));
 629
 630 extern void clear_displays PARAMS ((void));
 631
 632 extern void disable_breakpoint PARAMS ((struct breakpoint *));
 633
 634 extern void enable_breakpoint PARAMS ((struct breakpoint *));
 635
 636 extern void make_breakpoint_permanent PARAMS ((struct breakpoint *));
 637
 638 extern struct breakpoint *create_solib_event_breakpoint PARAMS ((CORE_ADDR));
 639
 640 extern void remove_solib_event_breakpoints PARAMS ((void));
 641
 642 extern void disable_breakpoints_in_shlibs PARAMS ((int silent));
 643
 644 extern void re_enable_breakpoints_in_shlibs PARAMS ((void));
 645
 646 extern void create_solib_load_event_breakpoint PARAMS ((char *, int,
 647                                                         char *, char *));
 648
 649 extern void create_solib_unload_event_breakpoint PARAMS ((char *, int,
 650                                                           char *, char *));
 651
 652 extern void create_fork_event_catchpoint PARAMS ((int, char *));
 653
 654 extern void create_vfork_event_catchpoint PARAMS ((int, char *));
 655
 656 extern void create_exec_event_catchpoint PARAMS ((int, char *));
 657
 658 /* This function returns TRUE if ep is a catchpoint. */
 659 extern int ep_is_catchpoint PARAMS ((struct breakpoint *));
 660
 661 /* This function returns TRUE if ep is a catchpoint of a
 662    shared library (aka dynamically-linked library) event,
 663    such as a library load or unload. */
 664 extern int ep_is_shlib_catchpoint PARAMS ((struct breakpoint *));
 665
 666 extern struct breakpoint *set_breakpoint_sal PARAMS ((struct symtab_and_line));
 667
 668 /* Enable breakpoints and delete when hit.  Called with ARG == NULL
 669    deletes all breakpoints. */
 670 extern void delete_command (char *arg, int from_tty);
 671
 672 #endif /* !defined (BREAKPOINT_H) */