gdb/breakpoint.h

   1 /* Data structures associated with breakpoints in GDB.
   2    Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
   3    2002, 2003, 2004
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   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 2 of the License, or
  11    (at your option) any later version.
  12
  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.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #if !defined (BREAKPOINT_H)
  24 #define BREAKPOINT_H 1
  25
  26 #include "frame.h"
  27 #include "value.h"
  28
  29 #include "gdb-events.h"
  30
  31 struct value;
  32 struct block;
  33
  34 /* This is the maximum number of bytes a breakpoint instruction can take.
  35    Feel free to increase it.  It's just used in a few places to size
  36    arrays that should be independent of the target architecture.  */
  37
  38 #define BREAKPOINT_MAX  16
  39 \f
  40 /* Type of breakpoint. */
  41 /* FIXME In the future, we should fold all other breakpoint-like things into
  42    here.  This includes:
  43
  44    * single-step (for machines where we have to simulate single stepping)
  45    (probably, though perhaps it is better for it to look as much as
  46    possible like a single-step to wait_for_inferior).  */
  47
  48 enum bptype
  49   {
  50     bp_none = 0,                /* Eventpoint has been deleted. */
  51     bp_breakpoint,              /* Normal breakpoint */
  52     bp_hardware_breakpoint,     /* Hardware assisted breakpoint */
  53     bp_until,                   /* used by until command */
  54     bp_finish,                  /* used by finish command */
  55     bp_watchpoint,              /* Watchpoint */
  56     bp_hardware_watchpoint,     /* Hardware assisted watchpoint */
  57     bp_read_watchpoint,         /* read watchpoint, (hardware assisted) */
  58     bp_access_watchpoint,       /* access watchpoint, (hardware assisted) */
  59     bp_longjmp,                 /* secret breakpoint to find longjmp() */
  60     bp_longjmp_resume,          /* secret breakpoint to escape longjmp() */
  61
  62     /* Used by wait_for_inferior for stepping over subroutine calls, for
  63        stepping over signal handlers, and for skipping prologues.  */
  64     bp_step_resume,
  65
  66     /* Used by wait_for_inferior for stepping over signal handlers.  */
  67     bp_through_sigtramp,
  68
  69     /* Used to detect when a watchpoint expression has gone out of
  70        scope.  These breakpoints are usually not visible to the user.
  71
  72        This breakpoint has some interesting properties:
  73
  74        1) There's always a 1:1 mapping between watchpoints
  75        on local variables and watchpoint_scope breakpoints.
  76
  77        2) It automatically deletes itself and the watchpoint it's
  78        associated with when hit.
  79
  80        3) It can never be disabled.  */
  81     bp_watchpoint_scope,
  82
  83     /* The breakpoint at the end of a call dummy.  */
  84     /* FIXME: What if the function we are calling longjmp()s out of the
  85        call, or the user gets out with the "return" command?  We currently
  86        have no way of cleaning up the breakpoint in these (obscure) situations.
  87        (Probably can solve this by noticing longjmp, "return", etc., it's
  88        similar to noticing when a watchpoint on a local variable goes out
  89        of scope (with hardware support for watchpoints)).  */
  90     bp_call_dummy,
  91
  92     /* Some dynamic linkers (HP, maybe Solaris) can arrange for special
  93        code in the inferior to run when significant events occur in the
  94        dynamic linker (for example a library is loaded or unloaded).
  95
  96        By placing a breakpoint in this magic code GDB will get control
  97        when these significant events occur.  GDB can then re-examine
  98        the dynamic linker's data structures to discover any newly loaded
  99        dynamic libraries.  */
 100     bp_shlib_event,
 101
 102     /* Some multi-threaded systems can arrange for a location in the
 103        inferior to be executed when certain thread-related events occur
 104        (such as thread creation or thread death).
 105
 106        By placing a breakpoint at one of these locations, GDB will get
 107        control when these events occur.  GDB can then update its thread
 108        lists etc.  */
 109
 110     bp_thread_event,
 111
 112     /* On the same principal, an overlay manager can arrange to call a
 113        magic location in the inferior whenever there is an interesting
 114        change in overlay status.  GDB can update its overlay tables
 115        and fiddle with breakpoints in overlays when this breakpoint
 116        is hit.  */
 117
 118     bp_overlay_event,
 119
 120     /* These breakpoints are used to implement the "catch load" command
 121        on platforms whose dynamic linkers support such functionality.  */
 122     bp_catch_load,
 123
 124     /* These breakpoints are used to implement the "catch unload" command
 125        on platforms whose dynamic linkers support such functionality.  */
 126     bp_catch_unload,
 127
 128     /* These are not really breakpoints, but are catchpoints that
 129        implement the "catch fork", "catch vfork" and "catch exec" commands
 130        on platforms whose kernel support such functionality.  (I.e.,
 131        kernels which can raise an event when a fork or exec occurs, as
 132        opposed to the debugger setting breakpoints on functions named
 133        "fork" or "exec".) */
 134     bp_catch_fork,
 135     bp_catch_vfork,
 136     bp_catch_exec,
 137
 138     /* These are catchpoints to implement "catch catch" and "catch throw"
 139        commands for C++ exception handling. */
 140     bp_catch_catch,
 141     bp_catch_throw
 142
 143
 144   };
 145
 146 /* States of enablement of breakpoint. */
 147
 148 enum enable_state
 149   {
 150     bp_disabled,        /* The eventpoint is inactive, and cannot trigger. */
 151     bp_enabled,         /* The eventpoint is active, and can trigger. */
 152     bp_shlib_disabled,  /* The eventpoint's address is in an unloaded solib.
 153                            The eventpoint will be automatically enabled
 154                            and reset when that solib is loaded. */
 155     bp_call_disabled,   /* The eventpoint has been disabled while a call
 156                            into the inferior is "in flight", because some
 157                            eventpoints interfere with the implementation of
 158                            a call on some targets.  The eventpoint will be
 159                            automatically enabled and reset when the call
 160                            "lands" (either completes, or stops at another
 161                            eventpoint). */
 162     bp_permanent        /* There is a breakpoint instruction hard-wired into
 163                            the target's code.  Don't try to write another
 164                            breakpoint instruction on top of it, or restore
 165                            its value.  Step over it using the architecture's
 166                            SKIP_INSN macro.  */
 167   };
 168
 169
 170 /* Disposition of breakpoint.  Ie: what to do after hitting it. */
 171
 172 enum bpdisp
 173   {
 174     disp_del,                   /* Delete it */
 175     disp_del_at_next_stop,      /* Delete at next stop, whether hit or not */
 176     disp_disable,               /* Disable it */
 177     disp_donttouch              /* Leave it alone */
 178   };
 179
 180 enum target_hw_bp_type
 181   {
 182     hw_write   = 0,             /* Common  HW watchpoint */
 183     hw_read    = 1,             /* Read    HW watchpoint */
 184     hw_access  = 2,             /* Access  HW watchpoint */
 185     hw_execute = 3              /* Execute HW breakpoint */
 186   };
 187
 188 /* GDB maintains two types of information about each breakpoint (or
 189    watchpoint, or other related event).  The first type corresponds
 190    to struct breakpoint; this is a relatively high-level structure
 191    which contains the source location(s), stopping conditions, user
 192    commands to execute when the breakpoint is hit, and so forth.
 193
 194    The second type of information corresponds to struct bp_location.
 195    Each breakpoint has one or (eventually) more locations associated
 196    with it, which represent target-specific and machine-specific
 197    mechanisms for stopping the program.  For instance, a watchpoint
 198    expression may require multiple hardware watchpoints in order to
 199    catch all changes in the value of the expression being watched.  */
 200
 201 enum bp_loc_type
 202 {
 203   bp_loc_software_breakpoint,
 204   bp_loc_hardware_breakpoint,
 205   bp_loc_hardware_watchpoint,
 206   bp_loc_other                  /* Miscellaneous...  */
 207 };
 208
 209 struct bp_location
 210 {
 211   /* Chain pointer to the next breakpoint location.  */
 212   struct bp_location *next;
 213
 214   /* Type of this breakpoint location.  */
 215   enum bp_loc_type loc_type;
 216
 217   /* Each breakpoint location must belong to exactly one higher-level
 218      breakpoint.  This and the DUPLICATE flag are more straightforward
 219      than reference counting.  */
 220   struct breakpoint *owner;
 221
 222   /* Nonzero if this breakpoint is now inserted.  */
 223   char inserted;
 224
 225   /* Nonzero if this is not the first breakpoint in the list
 226      for the given address.  */
 227   char duplicate;
 228
 229   /* If we someday support real thread-specific breakpoints, then
 230      the breakpoint location will need a thread identifier.  */
 231
 232   /* Data for specific breakpoint types.  These could be a union, but
 233      simplicity is more important than memory usage for breakpoints.  */
 234
 235   /* Note that zero is a perfectly valid code address on some platforms
 236      (for example, the mn10200 (OBSOLETE) and mn10300 simulators).  NULL
 237      is not a special value for this field.  Valid for all types except
 238      bp_loc_other.  */
 239   CORE_ADDR address;
 240
 241   /* For any breakpoint type with an address, this is the BFD section
 242      associated with the address.  Used primarily for overlay debugging.  */
 243   asection *section;
 244
 245   /* "Real" contents of byte where breakpoint has been inserted.
 246      Valid only when breakpoints are in the program.  Under the complete
 247      control of the target insert_breakpoint and remove_breakpoint routines.
 248      No other code should assume anything about the value(s) here.
 249      Valid only for bp_loc_software_breakpoint.  */
 250   char shadow_contents[BREAKPOINT_MAX];
 251
 252   /* Address at which breakpoint was requested, either by the user or
 253      by GDB for internal breakpoints.  This will usually be the same
 254      as ``address'' (above) except for cases in which
 255      ADJUST_BREAKPOINT_ADDRESS has computed a different address at
 256      which to place the breakpoint in order to comply with a
 257      processor's architectual constraints.  */
 258   CORE_ADDR requested_address;
 259 };
 260
 261 /* This structure is a collection of function pointers that, if available,
 262    will be called instead of the performing the default action for this
 263    bptype.  */
 264
 265 struct breakpoint_ops
 266 {
 267   /* The normal print routine for this breakpoint, called when we
 268      hit it.  */
 269   enum print_stop_action (*print_it) (struct breakpoint *);
 270
 271   /* Display information about this breakpoint, for "info breakpoints".  */
 272   void (*print_one) (struct breakpoint *, CORE_ADDR *);
 273
 274   /* Display information about this breakpoint after setting it (roughly
 275      speaking; this is called from "mention").  */
 276   void (*print_mention) (struct breakpoint *);
 277 };
 278
 279 /* Note that the ->silent field is not currently used by any commands
 280    (though the code is in there if it was to be, and set_raw_breakpoint
 281    does set it to 0).  I implemented it because I thought it would be
 282    useful for a hack I had to put in; I'm going to leave it in because
 283    I can see how there might be times when it would indeed be useful */
 284
 285 /* This is for a breakpoint or a watchpoint.  */
 286
 287 struct breakpoint
 288   {
 289     struct breakpoint *next;
 290     /* Type of breakpoint. */
 291     enum bptype type;
 292     /* Zero means disabled; remember the info but don't break here.  */
 293     enum enable_state enable_state;
 294     /* What to do with this breakpoint after we hit it. */
 295     enum bpdisp disposition;
 296     /* Number assigned to distinguish breakpoints.  */
 297     int number;
 298
 299     /* Location(s) associated with this high-level breakpoint.  */
 300     struct bp_location *loc;
 301
 302     /* Line number of this address.  */
 303
 304     int line_number;
 305
 306     /* Source file name of this address.  */
 307
 308     char *source_file;
 309
 310     /* Non-zero means a silent breakpoint (don't print frame info
 311        if we stop here). */
 312     unsigned char silent;
 313     /* Number of stops at this breakpoint that should
 314        be continued automatically before really stopping.  */
 315     int ignore_count;
 316     /* Chain of command lines to execute when this breakpoint is hit.  */
 317     struct command_line *commands;
 318     /* Stack depth (address of frame).  If nonzero, break only if fp
 319        equals this.  */
 320     struct frame_id frame_id;
 321     /* Conditional.  Break only if this expression's value is nonzero.  */
 322     struct expression *cond;
 323
 324     /* String we used to set the breakpoint (malloc'd).  */
 325     char *addr_string;
 326     /* Language we used to set the breakpoint.  */
 327     enum language language;
 328     /* Input radix we used to set the breakpoint.  */
 329     int input_radix;
 330     /* String form of the breakpoint condition (malloc'd), or NULL if there
 331        is no condition.  */
 332     char *cond_string;
 333     /* String form of exp (malloc'd), or NULL if none.  */
 334     char *exp_string;
 335
 336     /* The expression we are watching, or NULL if not a watchpoint.  */
 337     struct expression *exp;
 338     /* The largest block within which it is valid, or NULL if it is
 339        valid anywhere (e.g. consists just of global symbols).  */
 340     struct block *exp_valid_block;
 341     /* Value of the watchpoint the last time we checked it.  */
 342     struct value *val;
 343
 344     /* Holds the value chain for a hardware watchpoint expression.  */
 345     struct value *val_chain;
 346
 347     /* Holds the address of the related watchpoint_scope breakpoint
 348        when using watchpoints on local variables (might the concept
 349        of a related breakpoint be useful elsewhere, if not just call
 350        it the watchpoint_scope breakpoint or something like that. FIXME).  */
 351     struct breakpoint *related_breakpoint;
 352
 353     /* Holds the frame address which identifies the frame this
 354        watchpoint should be evaluated in, or `null' if the watchpoint
 355        should be evaluated on the outermost frame.  */
 356     struct frame_id watchpoint_frame;
 357
 358     /* Thread number for thread-specific breakpoint, or -1 if don't care */
 359     int thread;
 360
 361     /* Count of the number of times this breakpoint was taken, dumped
 362        with the info, but not used for anything else.  Useful for
 363        seeing how many times you hit a break prior to the program
 364        aborting, so you can back up to just before the abort.  */
 365     int hit_count;
 366
 367     /* Filename of a dynamically-linked library (dll), used for
 368        bp_catch_load and bp_catch_unload (malloc'd), or NULL if any
 369        library is significant.  */
 370     char *dll_pathname;
 371
 372     /* Filename of a dll whose state change (e.g., load or unload)
 373        triggered this catchpoint.  This field is only valid immediately
 374        after this catchpoint has triggered.  */
 375     char *triggered_dll_pathname;
 376
 377     /* Process id of a child process whose forking triggered this
 378        catchpoint.  This field is only valid immediately after this
 379        catchpoint has triggered.  */
 380     int forked_inferior_pid;
 381
 382     /* Filename of a program whose exec triggered this catchpoint.
 383        This field is only valid immediately after this catchpoint has
 384        triggered.  */
 385     char *exec_pathname;
 386
 387     /* Methods associated with this breakpoint.  */
 388     struct breakpoint_ops *ops;
 389
 390     /* Was breakpoint issued from a tty?  Saved for the use of pending breakpoints.  */
 391     int from_tty;
 392
 393     /* Flag value for pending breakpoint.
 394        first bit  : 0 non-temporary, 1 temporary.
 395        second bit : 0 normal breakpoint, 1 hardware breakpoint. */
 396     int flag;
 397
 398     /* Is breakpoint pending on shlib loads?  */
 399     int pending;
 400   };
 401 \f
 402 /* The following stuff is an abstract data type "bpstat" ("breakpoint
 403    status").  This provides the ability to determine whether we have
 404    stopped at a breakpoint, and what we should do about it.  */
 405
 406 typedef struct bpstats *bpstat;
 407
 408 /* Interface:  */
 409 /* Clear a bpstat so that it says we are not at any breakpoint.
 410    Also free any storage that is part of a bpstat.  */
 411 extern void bpstat_clear (bpstat *);
 412
 413 /* Return a copy of a bpstat.  Like "bs1 = bs2" but all storage that
 414    is part of the bpstat is copied as well.  */
 415 extern bpstat bpstat_copy (bpstat);
 416
 417 extern bpstat bpstat_stop_status (CORE_ADDR pc, ptid_t ptid,
 418                                   int stopped_by_watchpoint);
 419 \f
 420 /* This bpstat_what stuff tells wait_for_inferior what to do with a
 421    breakpoint (a challenging task).  */
 422
 423 enum bpstat_what_main_action
 424   {
 425     /* Perform various other tests; that is, this bpstat does not
 426        say to perform any action (e.g. failed watchpoint and nothing
 427        else).  */
 428     BPSTAT_WHAT_KEEP_CHECKING,
 429
 430     /* Rather than distinguish between noisy and silent stops here, it
 431        might be cleaner to have bpstat_print make that decision (also
 432        taking into account stop_print_frame and source_only).  But the
 433        implications are a bit scary (interaction with auto-displays, etc.),
 434        so I won't try it.  */
 435
 436     /* Stop silently.  */
 437     BPSTAT_WHAT_STOP_SILENT,
 438
 439     /* Stop and print.  */
 440     BPSTAT_WHAT_STOP_NOISY,
 441
 442     /* Remove breakpoints, single step once, then put them back in and
 443        go back to what we were doing.  It's possible that this should be
 444        removed from the main_action and put into a separate field, to more
 445        cleanly handle BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE.  */
 446     BPSTAT_WHAT_SINGLE,
 447
 448     /* Set longjmp_resume breakpoint, remove all other breakpoints,
 449        and continue.  The "remove all other breakpoints" part is required
 450        if we are also stepping over another breakpoint as well as doing
 451        the longjmp handling.  */
 452     BPSTAT_WHAT_SET_LONGJMP_RESUME,
 453
 454     /* Clear longjmp_resume breakpoint, then handle as
 455        BPSTAT_WHAT_KEEP_CHECKING.  */
 456     BPSTAT_WHAT_CLEAR_LONGJMP_RESUME,
 457
 458     /* Clear longjmp_resume breakpoint, then handle as BPSTAT_WHAT_SINGLE.  */
 459     BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE,
 460
 461     /* Clear step resume breakpoint, and keep checking.  */
 462     BPSTAT_WHAT_STEP_RESUME,
 463
 464     /* Clear through_sigtramp breakpoint, muck with trap_expected, and keep
 465        checking.  */
 466     BPSTAT_WHAT_THROUGH_SIGTRAMP,
 467
 468     /* Check the dynamic linker's data structures for new libraries, then
 469        keep checking.  */
 470     BPSTAT_WHAT_CHECK_SHLIBS,
 471
 472     /* Check the dynamic linker's data structures for new libraries, then
 473        resume out of the dynamic linker's callback, stop and print.  */
 474     BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK,
 475
 476     /* This is just used to keep track of how many enums there are.  */
 477     BPSTAT_WHAT_LAST
 478   };
 479
 480 struct bpstat_what
 481   {
 482     enum bpstat_what_main_action main_action;
 483
 484     /* Did we hit a call dummy breakpoint?  This only goes with a main_action
 485        of BPSTAT_WHAT_STOP_SILENT or BPSTAT_WHAT_STOP_NOISY (the concept of
 486        continuing from a call dummy without popping the frame is not a
 487        useful one).  */
 488     int call_dummy;
 489   };
 490
 491 /* The possible return values for print_bpstat, print_it_normal,
 492    print_it_done, print_it_noop. */
 493 enum print_stop_action
 494   {
 495     PRINT_UNKNOWN = -1,
 496     PRINT_SRC_AND_LOC,
 497     PRINT_SRC_ONLY,
 498     PRINT_NOTHING
 499   };
 500
 501 /* Tell what to do about this bpstat.  */
 502 struct bpstat_what bpstat_what (bpstat);
 503 \f
 504 /* Find the bpstat associated with a breakpoint.  NULL otherwise. */
 505 bpstat bpstat_find_breakpoint (bpstat, struct breakpoint *);
 506
 507 /* Find a step_resume breakpoint associated with this bpstat.
 508    (If there are multiple step_resume bp's on the list, this function
 509    will arbitrarily pick one.)
 510
 511    It is an error to use this function if BPSTAT doesn't contain a
 512    step_resume breakpoint.
 513
 514    See wait_for_inferior's use of this function.
 515  */
 516 extern struct breakpoint *bpstat_find_step_resume_breakpoint (bpstat);
 517
 518 /* Nonzero if a signal that we got in wait() was due to circumstances
 519    explained by the BS.  */
 520 /* Currently that is true if we have hit a breakpoint, or if there is
 521    a watchpoint enabled.  */
 522 #define bpstat_explains_signal(bs) ((bs) != NULL)
 523
 524 /* Nonzero if we should step constantly (e.g. watchpoints on machines
 525    without hardware support).  This isn't related to a specific bpstat,
 526    just to things like whether watchpoints are set.  */
 527 extern int bpstat_should_step (void);
 528
 529 /* Nonzero if there are enabled hardware watchpoints. */
 530 extern int bpstat_have_active_hw_watchpoints (void);
 531
 532 /* Print a message indicating what happened.  Returns nonzero to
 533    say that only the source line should be printed after this (zero
 534    return means print the frame as well as the source line).  */
 535 extern enum print_stop_action bpstat_print (bpstat);
 536
 537 /* Return the breakpoint number of the first breakpoint we are stopped
 538    at.  *BSP upon return is a bpstat which points to the remaining
 539    breakpoints stopped at (but which is not guaranteed to be good for
 540    anything but further calls to bpstat_num).
 541    Return 0 if passed a bpstat which does not indicate any breakpoints.  */
 542 extern int bpstat_num (bpstat *);
 543
 544 /* Perform actions associated with having stopped at *BSP.  Actually, we just
 545    use this for breakpoint commands.  Perhaps other actions will go here
 546    later, but this is executed at a late time (from the command loop).  */
 547 extern void bpstat_do_actions (bpstat *);
 548
 549 /* Modify BS so that the actions will not be performed.  */
 550 extern void bpstat_clear_actions (bpstat);
 551
 552 /* Given a bpstat that records zero or more triggered eventpoints, this
 553    function returns another bpstat which contains only the catchpoints
 554    on that first list, if any.
 555  */
 556 extern void bpstat_get_triggered_catchpoints (bpstat, bpstat *);
 557
 558 /* Implementation:  */
 559
 560 /* Values used to tell the printing routine how to behave for this bpstat. */
 561 enum bp_print_how
 562   {
 563     /* This is used when we want to do a normal printing of the reason
 564        for stopping. The output will depend on the type of eventpoint
 565        we are dealing with. This is the default value, most commonly
 566        used. */
 567     print_it_normal,
 568     /* This is used when nothing should be printed for this bpstat entry.  */
 569     print_it_noop,
 570     /* This is used when everything which needs to be printed has
 571        already been printed.  But we still want to print the frame.  */
 572     print_it_done
 573   };
 574
 575 struct bpstats
 576   {
 577     /* Linked list because there can be two breakpoints at the same
 578        place, and a bpstat reflects the fact that both have been hit.  */
 579     bpstat next;
 580     /* Breakpoint that we are at.  */
 581     struct breakpoint *breakpoint_at;
 582     /* Commands left to be done.  */
 583     struct command_line *commands;
 584     /* Old value associated with a watchpoint.  */
 585     struct value *old_val;
 586
 587     /* Nonzero if this breakpoint tells us to print the frame.  */
 588     char print;
 589
 590     /* Nonzero if this breakpoint tells us to stop.  */
 591     char stop;
 592
 593     /* Tell bpstat_print and print_bp_stop_message how to print stuff
 594        associated with this element of the bpstat chain.  */
 595     enum bp_print_how print_it;
 596   };
 597
 598 enum inf_context
 599   {
 600     inf_starting,
 601     inf_running,
 602     inf_exited
 603   };
 604
 605 /* The possible return values for breakpoint_here_p.
 606    We guarantee that zero always means "no breakpoint here".  */
 607 enum breakpoint_here
 608   {
 609     no_breakpoint_here = 0,
 610     ordinary_breakpoint_here,
 611     permanent_breakpoint_here
 612   };
 613 \f
 614
 615 /* Prototypes for breakpoint-related functions.  */
 616
 617 extern enum breakpoint_here breakpoint_here_p (CORE_ADDR);
 618
 619 extern int breakpoint_inserted_here_p (CORE_ADDR);
 620
 621 extern int software_breakpoint_inserted_here_p (CORE_ADDR);
 622
 623 extern int breakpoint_thread_match (CORE_ADDR, ptid_t);
 624
 625 extern void until_break_command (char *, int, int);
 626
 627 extern void breakpoint_re_set (void);
 628
 629 extern void breakpoint_re_set_thread (struct breakpoint *);
 630
 631 extern int ep_is_exception_catchpoint (struct breakpoint *);
 632
 633 extern struct breakpoint *set_momentary_breakpoint
 634   (struct symtab_and_line, struct frame_id, enum bptype);
 635
 636 extern void set_ignore_count (int, int, int);
 637
 638 extern void set_default_breakpoint (int, CORE_ADDR, struct symtab *, int);
 639
 640 extern void mark_breakpoints_out (void);
 641
 642 extern void breakpoint_init_inferior (enum inf_context);
 643
 644 extern struct cleanup *make_cleanup_delete_breakpoint (struct breakpoint *);
 645
 646 extern struct cleanup *make_exec_cleanup_delete_breakpoint (struct breakpoint *);
 647
 648 extern void delete_breakpoint (struct breakpoint *);
 649
 650 extern void breakpoint_auto_delete (bpstat);
 651
 652 extern void breakpoint_clear_ignore_counts (void);
 653
 654 extern void break_command (char *, int);
 655
 656 extern void hbreak_command_wrapper (char *, int);
 657 extern void thbreak_command_wrapper (char *, int);
 658 extern void rbreak_command_wrapper (char *, int);
 659 extern void watch_command_wrapper (char *, int);
 660 extern void awatch_command_wrapper (char *, int);
 661 extern void rwatch_command_wrapper (char *, int);
 662 extern void tbreak_command (char *, int);
 663
 664 extern int insert_breakpoints (void);
 665
 666 extern int remove_breakpoints (void);
 667
 668 /* This function can be used to physically insert eventpoints from the
 669    specified traced inferior process, without modifying the breakpoint
 670    package's state.  This can be useful for those targets which support
 671    following the processes of a fork() or vfork() system call, when both
 672    of the resulting two processes are to be followed.  */
 673 extern int reattach_breakpoints (int);
 674
 675 /* This function can be used to update the breakpoint package's state
 676    after an exec() system call has been executed.
 677
 678    This function causes the following:
 679
 680    - All eventpoints are marked "not inserted".
 681    - All eventpoints with a symbolic address are reset such that
 682    the symbolic address must be reevaluated before the eventpoints
 683    can be reinserted.
 684    - The solib breakpoints are explicitly removed from the breakpoint
 685    list.
 686    - A step-resume breakpoint, if any, is explicitly removed from the
 687    breakpoint list.
 688    - All eventpoints without a symbolic address are removed from the
 689    breakpoint list. */
 690 extern void update_breakpoints_after_exec (void);
 691
 692 /* This function can be used to physically remove hardware breakpoints
 693    and watchpoints from the specified traced inferior process, without
 694    modifying the breakpoint package's state.  This can be useful for
 695    those targets which support following the processes of a fork() or
 696    vfork() system call, when one of the resulting two processes is to
 697    be detached and allowed to run free.
 698
 699    It is an error to use this function on the process whose id is
 700    inferior_ptid.  */
 701 extern int detach_breakpoints (int);
 702
 703 extern void enable_longjmp_breakpoint (void);
 704 extern void disable_longjmp_breakpoint (void);
 705 extern void enable_overlay_breakpoints (void);
 706 extern void disable_overlay_breakpoints (void);
 707
 708 extern void set_longjmp_resume_breakpoint (CORE_ADDR, struct frame_id);
 709 /* These functions respectively disable or reenable all currently
 710    enabled watchpoints.  When disabled, the watchpoints are marked
 711    call_disabled.  When reenabled, they are marked enabled.
 712
 713    The intended client of these functions is call_function_by_hand.
 714
 715    The inferior must be stopped, and all breakpoints removed, when
 716    these functions are used.
 717
 718    The need for these functions is that on some targets (e.g., HP-UX),
 719    gdb is unable to unwind through the dummy frame that is pushed as
 720    part of the implementation of a call command.  Watchpoints can
 721    cause the inferior to stop in places where this frame is visible,
 722    and that can cause execution control to become very confused.
 723
 724    Note that if a user sets breakpoints in an interactively called
 725    function, the call_disabled watchpoints will have been reenabled
 726    when the first such breakpoint is reached.  However, on targets
 727    that are unable to unwind through the call dummy frame, watches
 728    of stack-based storage may then be deleted, because gdb will
 729    believe that their watched storage is out of scope.  (Sigh.) */
 730 extern void disable_watchpoints_before_interactive_call_start (void);
 731
 732 extern void enable_watchpoints_after_interactive_call_stop (void);
 733
 734
 735 extern void clear_breakpoint_hit_counts (void);
 736
 737 extern int get_number (char **);
 738
 739 extern int get_number_or_range (char **);
 740
 741 /* The following are for displays, which aren't really breakpoints, but
 742    here is as good a place as any for them.  */
 743
 744 extern void disable_current_display (void);
 745
 746 extern void do_displays (void);
 747
 748 extern void disable_display (int);
 749
 750 extern void clear_displays (void);
 751
 752 extern void disable_breakpoint (struct breakpoint *);
 753
 754 extern void enable_breakpoint (struct breakpoint *);
 755
 756 extern void make_breakpoint_permanent (struct breakpoint *);
 757
 758 extern struct breakpoint *create_solib_event_breakpoint (CORE_ADDR);
 759
 760 extern struct breakpoint *create_thread_event_breakpoint (CORE_ADDR);
 761
 762 extern void remove_solib_event_breakpoints (void);
 763
 764 extern void remove_thread_event_breakpoints (void);
 765
 766 extern void disable_breakpoints_in_shlibs (int silent);
 767
 768 extern void re_enable_breakpoints_in_shlibs (void);
 769
 770 extern void create_solib_load_event_breakpoint (char *, int, char *, char *);
 771
 772 extern void create_solib_unload_event_breakpoint (char *, int,
 773                                                   char *, char *);
 774
 775 extern void create_fork_event_catchpoint (int, char *);
 776
 777 extern void create_vfork_event_catchpoint (int, char *);
 778
 779 extern void create_exec_event_catchpoint (int, char *);
 780
 781 /* This function returns TRUE if ep is a catchpoint. */
 782 extern int ep_is_catchpoint (struct breakpoint *);
 783
 784 /* This function returns TRUE if ep is a catchpoint of a
 785    shared library (aka dynamically-linked library) event,
 786    such as a library load or unload. */
 787 extern int ep_is_shlib_catchpoint (struct breakpoint *);
 788
 789 extern struct breakpoint *set_breakpoint_sal (struct symtab_and_line);
 790
 791 /* Enable breakpoints and delete when hit.  Called with ARG == NULL
 792    deletes all breakpoints. */
 793 extern void delete_command (char *arg, int from_tty);
 794
 795 /* Pull all H/W watchpoints from the target. Return non-zero if the
 796    remove fails. */
 797 extern int remove_hw_watchpoints (void);
 798
 799
 800 /* Indicator of whether exception catchpoints should be nuked between
 801    runs of a program.  */
 802 extern int deprecated_exception_catchpoints_are_fragile;
 803
 804 /* Indicator of when exception catchpoints set-up should be
 805    reinitialized -- e.g. when program is re-run.  */
 806 extern int deprecated_exception_support_initialized;
 807
 808 #endif /* !defined (BREAKPOINT_H) */