Subversion Repositories openrisc_2011-10-31

/* Data structures associated with breakpoints in GDB.

   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,

   2002, 2003, 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#if !defined (BREAKPOINT_H)

#define BREAKPOINT_H 1

#include "frame.h"

#include "value.h"

#include "vec.h"

struct value;

struct block;

/* This is the maximum number of bytes a breakpoint instruction can take.

   Feel free to increase it.  It's just used in a few places to size

   arrays that should be independent of the target architecture.  */

#define BREAKPOINT_MAX  16

/* Type of breakpoint.  */

/* FIXME In the future, we should fold all other breakpoint-like things into

   here.  This includes:

   * single-step (for machines where we have to simulate single stepping)

   (probably, though perhaps it is better for it to look as much as

   possible like a single-step to wait_for_inferior).  */

enum bptype

  {

    bp_none = 0,         /* Eventpoint has been deleted. */

    bp_breakpoint,              /* Normal breakpoint */

    bp_hardware_breakpoint,     /* Hardware assisted breakpoint */

    bp_until,                   /* used by until command */

    bp_finish,                  /* used by finish command */

    bp_watchpoint,              /* Watchpoint */

    bp_hardware_watchpoint,     /* Hardware assisted watchpoint */

    bp_read_watchpoint,         /* read watchpoint, (hardware assisted) */

    bp_access_watchpoint,       /* access watchpoint, (hardware assisted) */

    bp_longjmp,                 /* secret breakpoint to find longjmp() */

    bp_longjmp_resume,          /* secret breakpoint to escape longjmp() */

    /* Used by wait_for_inferior for stepping over subroutine calls, for

       stepping over signal handlers, and for skipping prologues.  */

    bp_step_resume,

    /* Used to detect when a watchpoint expression has gone out of

       scope.  These breakpoints are usually not visible to the user.

       This breakpoint has some interesting properties:

       1) There's always a 1:1 mapping between watchpoints

       on local variables and watchpoint_scope breakpoints.

       2) It automatically deletes itself and the watchpoint it's

       associated with when hit.

       3) It can never be disabled.  */

    bp_watchpoint_scope,

    /* The breakpoint at the end of a call dummy.  */

    /* FIXME: What if the function we are calling longjmp()s out of the

       call, or the user gets out with the "return" command?  We currently

       have no way of cleaning up the breakpoint in these (obscure) situations.

       (Probably can solve this by noticing longjmp, "return", etc., it's

       similar to noticing when a watchpoint on a local variable goes out

       of scope (with hardware support for watchpoints)).  */

    bp_call_dummy,

    /* A breakpoint set on std::terminate, that is used to catch

       otherwise uncaught exceptions thrown during an inferior call.  */

    bp_std_terminate,

    /* Some dynamic linkers (HP, maybe Solaris) can arrange for special

       code in the inferior to run when significant events occur in the

       dynamic linker (for example a library is loaded or unloaded).

       By placing a breakpoint in this magic code GDB will get control

       when these significant events occur.  GDB can then re-examine

       the dynamic linker's data structures to discover any newly loaded

       dynamic libraries.  */

    bp_shlib_event,

    /* Some multi-threaded systems can arrange for a location in the

       inferior to be executed when certain thread-related events occur

       (such as thread creation or thread death).

       By placing a breakpoint at one of these locations, GDB will get

       control when these events occur.  GDB can then update its thread

       lists etc.  */

    bp_thread_event,

    /* On the same principal, an overlay manager can arrange to call a

       magic location in the inferior whenever there is an interesting

       change in overlay status.  GDB can update its overlay tables

       and fiddle with breakpoints in overlays when this breakpoint

       is hit.  */

    bp_overlay_event,

    /* Master copies of longjmp breakpoints.  These are always installed

       as soon as an objfile containing longjmp is loaded, but they are

       always disabled.  While necessary, temporary clones of bp_longjmp

       type will be created and enabled.  */

    bp_longjmp_master,

    /* Master copies of std::terminate breakpoints.  */

    bp_std_terminate_master,

    bp_catchpoint,

    bp_tracepoint,

    bp_fast_tracepoint,

    bp_static_tracepoint,

    /* Event for JIT compiled code generation or deletion.  */

    bp_jit_event,

  };

/* States of enablement of breakpoint. */

enum enable_state

  {

    bp_disabled,        /* The eventpoint is inactive, and cannot trigger. */

    bp_enabled,         /* The eventpoint is active, and can trigger. */

    bp_call_disabled,   /* The eventpoint has been disabled while a call

                           into the inferior is "in flight", because some

                           eventpoints interfere with the implementation of

                           a call on some targets.  The eventpoint will be

                           automatically enabled and reset when the call

                           "lands" (either completes, or stops at another

                           eventpoint). */

    bp_startup_disabled,/* The eventpoint has been disabled during inferior

                           startup.  This is necessary on some targets where

                           the main executable will get relocated during

                           startup, making breakpoint addresses invalid.

                           The eventpoint will be automatically enabled and

                           reset once inferior startup is complete.  */

    bp_permanent        /* There is a breakpoint instruction hard-wired into

                           the target's code.  Don't try to write another

                           breakpoint instruction on top of it, or restore

                           its value.  Step over it using the architecture's

                           SKIP_INSN macro.  */

  };

/* Disposition of breakpoint.  Ie: what to do after hitting it. */

enum bpdisp

  {

    disp_del,                   /* Delete it */

    disp_del_at_next_stop,      /* Delete at next stop, whether hit or not */

    disp_disable,               /* Disable it */

    disp_donttouch              /* Leave it alone */

  };

enum target_hw_bp_type

  {

    hw_write   = 0,              /* Common  HW watchpoint */

    hw_read    = 1,             /* Read    HW watchpoint */

    hw_access  = 2,             /* Access  HW watchpoint */

    hw_execute = 3              /* Execute HW breakpoint */

  };

/* Information used by targets to insert and remove breakpoints.  */

struct bp_target_info

{

  /* Address space at which the breakpoint was placed.  */

  struct address_space *placed_address_space;

  /* Address at which the breakpoint was placed.  This is normally the

     same as ADDRESS from the bp_location, except when adjustment

     happens in gdbarch_breakpoint_from_pc.  The most common form of

     adjustment is stripping an alternate ISA marker from the PC which

     is used to determine the type of breakpoint to insert.  */

  CORE_ADDR placed_address;

  /* If the breakpoint lives in memory and reading that memory would

     give back the breakpoint, instead of the original contents, then

     the original contents are cached here.  Only SHADOW_LEN bytes of

     this buffer are valid, and only when the breakpoint is inserted.  */

  gdb_byte shadow_contents[BREAKPOINT_MAX];

  /* The length of the data cached in SHADOW_CONTENTS.  */

  int shadow_len;

  /* The size of the placed breakpoint, according to

     gdbarch_breakpoint_from_pc, when the breakpoint was inserted.  This is

     generally the same as SHADOW_LEN, unless we did not need

     to read from the target to implement the memory breakpoint

     (e.g. if a remote stub handled the details).  We may still

     need the size to remove the breakpoint safely.  */

  int placed_size;

};

/* GDB maintains two types of information about each breakpoint (or

   watchpoint, or other related event).  The first type corresponds

   to struct breakpoint; this is a relatively high-level structure

   which contains the source location(s), stopping conditions, user

   commands to execute when the breakpoint is hit, and so forth.

   The second type of information corresponds to struct bp_location.

   Each breakpoint has one or (eventually) more locations associated

   with it, which represent target-specific and machine-specific

   mechanisms for stopping the program.  For instance, a watchpoint

   expression may require multiple hardware watchpoints in order to

   catch all changes in the value of the expression being watched.  */

enum bp_loc_type

{

  bp_loc_software_breakpoint,

  bp_loc_hardware_breakpoint,

  bp_loc_hardware_watchpoint,

  bp_loc_other                  /* Miscellaneous...  */

};

struct bp_location

{

  /* Chain pointer to the next breakpoint location for

     the same parent breakpoint.  */

  struct bp_location *next;

  /* Type of this breakpoint location.  */

  enum bp_loc_type loc_type;

  /* Each breakpoint location must belong to exactly one higher-level

     breakpoint.  This and the DUPLICATE flag are more straightforward

     than reference counting.  This pointer is NULL iff this bp_location is in

     (and therefore only in) moribund_locations.  */

  struct breakpoint *owner;

  /* Conditional.  Break only if this expression's value is nonzero.

     Unlike string form of condition, which is associated with

     breakpoint, this is associated with location, since if breakpoint

     has several locations, the evaluation of expression can be

     different for different locations.  Only valid for real

     breakpoints; a watchpoint's conditional expression is stored in

     the owner breakpoint object.  */

  struct expression *cond;

  /* This location's address is in an unloaded solib, and so this

     location should not be inserted.  It will be automatically

     enabled when that solib is loaded.  */

  char shlib_disabled;

  /* Is this particular location enabled.  */

  char enabled;

  /* Nonzero if this breakpoint is now inserted.  */

  char inserted;

  /* Nonzero if this is not the first breakpoint in the list

     for the given address.  */

  char duplicate;

  /* If we someday support real thread-specific breakpoints, then

     the breakpoint location will need a thread identifier.  */

  /* Data for specific breakpoint types.  These could be a union, but

     simplicity is more important than memory usage for breakpoints.  */

  /* Architecture associated with this location's address.  May be

     different from the breakpoint architecture.  */

  struct gdbarch *gdbarch;

  /* The program space associated with this breakpoint location

     address.  Note that an address space may be represented in more

     than one program space (e.g. each uClinux program will be given

     its own program space, but there will only be one address space

     for all of them), but we must not insert more than one location

     at the same address in the same address space.  */

  struct program_space *pspace;

  /* Note that zero is a perfectly valid code address on some platforms

     (for example, the mn10200 (OBSOLETE) and mn10300 simulators).  NULL

     is not a special value for this field.  Valid for all types except

     bp_loc_other.  */

  CORE_ADDR address;

  /* For hardware watchpoints, the size of data ad ADDRESS being watches.  */

  int length;

  /* Type of hardware watchpoint. */

  enum target_hw_bp_type watchpoint_type;

  /* For any breakpoint type with an address, this is the section

     associated with the address.  Used primarily for overlay debugging.  */

  struct obj_section *section;

  /* Address at which breakpoint was requested, either by the user or

     by GDB for internal breakpoints.  This will usually be the same

     as ``address'' (above) except for cases in which

     ADJUST_BREAKPOINT_ADDRESS has computed a different address at

     which to place the breakpoint in order to comply with a

     processor's architectual constraints.  */

  CORE_ADDR requested_address;

  char *function_name;

  /* Details of the placed breakpoint, when inserted.  */

  struct bp_target_info target_info;

  /* Similarly, for the breakpoint at an overlay's LMA, if necessary.  */

  struct bp_target_info overlay_target_info;

  /* In a non-stop mode, it's possible that we delete a breakpoint,

     but as we do that, some still running thread hits that breakpoint.

     For that reason, we need to keep locations belonging to deleted

     breakpoints for a bit, so that don't report unexpected SIGTRAP.

     We can't keep such locations forever, so we use a heuristic --

     after we process certain number of inferior events since

     breakpoint was deleted, we retire all locations of that breakpoint.

     This variable keeps a number of events still to go, when

     it becomes 0 this location is retired.  */

  int events_till_retirement;

};

/* This structure is a collection of function pointers that, if available,

   will be called instead of the performing the default action for this

   bptype.  */

struct breakpoint_ops

{

  /* Insert the breakpoint or activate the catchpoint.  Should raise

     an exception if the operation failed.  */

  void (*insert) (struct breakpoint *);

  /* Remove the breakpoint/catchpoint that was previously inserted

     with the "insert" method above.  Return non-zero if the operation

     succeeded.  */

  int (*remove) (struct breakpoint *);

  /* Return non-zero if the debugger should tell the user that this

     breakpoint was hit.  */

  int (*breakpoint_hit) (struct breakpoint *);

  /* The normal print routine for this breakpoint, called when we

     hit it.  */

  enum print_stop_action (*print_it) (struct breakpoint *);

  /* Display information about this breakpoint, for "info breakpoints".  */

  void (*print_one) (struct breakpoint *, struct bp_location **);

  /* Display information about this breakpoint after setting it (roughly

     speaking; this is called from "mention").  */

  void (*print_mention) (struct breakpoint *);

  /* Print to FP the CLI command that recreates this breakpoint.  */

  void (*print_recreate) (struct breakpoint *, struct ui_file *fp);

};

enum watchpoint_triggered

{

  /* This watchpoint definitely did not trigger.  */

  watch_triggered_no = 0,

  /* Some hardware watchpoint triggered, and it might have been this

     one, but we do not know which it was.  */

  watch_triggered_unknown,

  /* This hardware watchpoint definitely did trigger.  */

  watch_triggered_yes

};

/* This is used to declare the VEC syscalls_to_be_caught.  */

DEF_VEC_I(int);

typedef struct bp_location *bp_location_p;

DEF_VEC_P(bp_location_p);

/* A reference-counted struct command_line.  This lets multiple

   breakpoints share a single command list.  This is an implementation

   detail to the breakpoints module.  */

struct counted_command_line;

/* Note that the ->silent field is not currently used by any commands

   (though the code is in there if it was to be, and set_raw_breakpoint

   does set it to 0).  I implemented it because I thought it would be

   useful for a hack I had to put in; I'm going to leave it in because

   I can see how there might be times when it would indeed be useful */

/* This is for a breakpoint or a watchpoint.  */

struct breakpoint

  {

    struct breakpoint *next;

    /* Type of breakpoint. */

    enum bptype type;

    /* Zero means disabled; remember the info but don't break here.  */

    enum enable_state enable_state;

    /* What to do with this breakpoint after we hit it. */

    enum bpdisp disposition;

    /* Number assigned to distinguish breakpoints.  */

    int number;

    /* Location(s) associated with this high-level breakpoint.  */

    struct bp_location *loc;

    /* Line number of this address.  */

    int line_number;

    /* Source file name of this address.  */

    char *source_file;

    /* Non-zero means a silent breakpoint (don't print frame info

       if we stop here). */

    unsigned char silent;

    /* Number of stops at this breakpoint that should

       be continued automatically before really stopping.  */

    int ignore_count;

    /* Chain of command lines to execute when this breakpoint is hit.  */

    struct counted_command_line *commands;

    /* Stack depth (address of frame).  If nonzero, break only if fp

       equals this.  */

    struct frame_id frame_id;

    /* The program space used to set the breakpoint.  */

    struct program_space *pspace;

    /* String we used to set the breakpoint (malloc'd).  */

    char *addr_string;

    /* Architecture we used to set the breakpoint.  */

    struct gdbarch *gdbarch;

    /* Language we used to set the breakpoint.  */

    enum language language;

    /* Input radix we used to set the breakpoint.  */

    int input_radix;

    /* String form of the breakpoint condition (malloc'd), or NULL if there

       is no condition.  */

    char *cond_string;

    /* String form of exp (malloc'd), or NULL if none.  */

    char *exp_string;

    /* The expression we are watching, or NULL if not a watchpoint.  */

    struct expression *exp;

    /* The largest block within which it is valid, or NULL if it is

       valid anywhere (e.g. consists just of global symbols).  */

    struct block *exp_valid_block;

    /* The conditional expression if any.  NULL if not a watchpoint.  */

    struct expression *cond_exp;

    /* The largest block within which it is valid, or NULL if it is

       valid anywhere (e.g. consists just of global symbols).  */

    struct block *cond_exp_valid_block;

    /* Value of the watchpoint the last time we checked it, or NULL

       when we do not know the value yet or the value was not

       readable.  VAL is never lazy.  */

    struct value *val;

    /* Nonzero if VAL is valid.  If VAL_VALID is set but VAL is NULL,

       then an error occurred reading the value.  */

    int val_valid;

    /* Holds the address of the related watchpoint_scope breakpoint

       when using watchpoints on local variables (might the concept

       of a related breakpoint be useful elsewhere, if not just call

       it the watchpoint_scope breakpoint or something like that. FIXME).  */

    struct breakpoint *related_breakpoint;

    /* Holds the frame address which identifies the frame this

       watchpoint should be evaluated in, or `null' if the watchpoint

       should be evaluated on the outermost frame.  */

    struct frame_id watchpoint_frame;

    /* Holds the thread which identifies the frame this watchpoint

       should be considered in scope for, or `null_ptid' if the

       watchpoint should be evaluated in all threads.  */

    ptid_t watchpoint_thread;

    /* For hardware watchpoints, the triggered status according to the

       hardware.  */

    enum watchpoint_triggered watchpoint_triggered;

    /* Thread number for thread-specific breakpoint, or -1 if don't care.  */

    int thread;

    /* Ada task number for task-specific breakpoint, or 0 if don't care.  */

    int task;

    /* Count of the number of times this breakpoint was taken, dumped

       with the info, but not used for anything else.  Useful for

       seeing how many times you hit a break prior to the program

       aborting, so you can back up to just before the abort.  */

    int hit_count;

    /* Process id of a child process whose forking triggered this

       catchpoint.  This field is only valid immediately after this

       catchpoint has triggered.  */

    ptid_t forked_inferior_pid;

    /* Filename of a program whose exec triggered this catchpoint.

       This field is only valid immediately after this catchpoint has

       triggered.  */

    char *exec_pathname;

    /* Syscall numbers used for the 'catch syscall' feature.

       If no syscall has been specified for filtering, its value is NULL.

       Otherwise, it holds a list of all syscalls to be caught.

       The list elements are allocated with xmalloc.  */

    VEC(int) *syscalls_to_be_caught;

    /* Methods associated with this breakpoint.  */

    struct breakpoint_ops *ops;

    /* Is breakpoint's condition not yet parsed because we found

       no location initially so had no context to parse

       the condition in.  */

    int condition_not_parsed;

    /* Number of times this tracepoint should single-step

       and collect additional data.  */

    long step_count;

    /* Number of times this tracepoint should be hit before

       disabling/ending.  */

    int pass_count;

    /* The number of the tracepoint on the target.  */

    int number_on_target;

    /* The static tracepoint marker id, if known.  */

    char *static_trace_marker_id;

    /* LTTng/UST allow more than one marker with the same ID string,

       although it unadvised because it confuses tools.  When setting

       static tracepoints by marker ID, this will record the index in

       the array of markers we found for the given marker ID for which

       this static tracepoint corresponds.  When resetting

       breakpoints, we will use this index to try to find the same

       marker again.  */

    int static_trace_marker_id_idx;

  };

typedef struct breakpoint *breakpoint_p;

DEF_VEC_P(breakpoint_p);

/* The following stuff is an abstract data type "bpstat" ("breakpoint

   status").  This provides the ability to determine whether we have

   stopped at a breakpoint, and what we should do about it.  */

typedef struct bpstats *bpstat;

/* Frees any storage that is part of a bpstat.

   Does not walk the 'next' chain.  */

extern void bpstat_free (bpstat);

/* Clears a chain of bpstat, freeing storage

   of each.  */

extern void bpstat_clear (bpstat *);

/* Return a copy of a bpstat.  Like "bs1 = bs2" but all storage that

   is part of the bpstat is copied as well.  */

extern bpstat bpstat_copy (bpstat);

extern bpstat bpstat_stop_status (struct address_space *aspace,

                                  CORE_ADDR pc, ptid_t ptid);

/* This bpstat_what stuff tells wait_for_inferior what to do with a

   breakpoint (a challenging task).

   The enum values order defines priority-like order of the actions.

   Once you've decided that some action is appropriate, you'll never

   go back and decide something of a lower priority is better.  Each

   of these actions is mutually exclusive with the others.  That

   means, that if you find yourself adding a new action class here and

   wanting to tell GDB that you have two simultaneous actions to

   handle, something is wrong, and you probably don't actually need a

   new action type.

   Note that a step resume breakpoint overrides another breakpoint of

   signal handling (see comment in wait_for_inferior at where we set

   the step_resume breakpoint).  */

enum bpstat_what_main_action

  {

    /* Perform various other tests; that is, this bpstat does not

       say to perform any action (e.g. failed watchpoint and nothing

       else).  */

    BPSTAT_WHAT_KEEP_CHECKING,

    /* Remove breakpoints, single step once, then put them back in and

       go back to what we were doing.  It's possible that this should be

       removed from the main_action and put into a separate field, to more

       cleanly handle BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE.  */

    BPSTAT_WHAT_SINGLE,

    /* Set longjmp_resume breakpoint, remove all other breakpoints,

       and continue.  The "remove all other breakpoints" part is required

       if we are also stepping over another breakpoint as well as doing

       the longjmp handling.  */

    BPSTAT_WHAT_SET_LONGJMP_RESUME,

    /* Clear longjmp_resume breakpoint, then handle as

       BPSTAT_WHAT_KEEP_CHECKING.  */

    BPSTAT_WHAT_CLEAR_LONGJMP_RESUME,

    /* Rather than distinguish between noisy and silent stops here, it

       might be cleaner to have bpstat_print make that decision (also

       taking into account stop_print_frame and source_only).  But the

       implications are a bit scary (interaction with auto-displays, etc.),

       so I won't try it.  */

    /* Stop silently.  */

    BPSTAT_WHAT_STOP_SILENT,

    /* Stop and print.  */

    BPSTAT_WHAT_STOP_NOISY,

    /* Clear step resume breakpoint, and keep checking.  */

    BPSTAT_WHAT_STEP_RESUME,

  };

/* An enum indicating the kind of "stack dummy" stop.  This is a bit

   of a misnomer because only one kind of truly a stack dummy.  */

enum stop_stack_kind

  {

    /* We didn't stop at a stack dummy breakpoint.  */

    STOP_NONE = 0,

    /* Stopped at a stack dummy.  */

    STOP_STACK_DUMMY,

    /* Stopped at std::terminate.  */

    STOP_STD_TERMINATE

  };

struct bpstat_what

  {

    enum bpstat_what_main_action main_action;

    /* Did we hit a call dummy breakpoint?  This only goes with a main_action

       of BPSTAT_WHAT_STOP_SILENT or BPSTAT_WHAT_STOP_NOISY (the concept of

       continuing from a call dummy without popping the frame is not a

       useful one).  */

    enum stop_stack_kind call_dummy;

  };

/* The possible return values for print_bpstat, print_it_normal,

   print_it_done, print_it_noop. */

enum print_stop_action

  {

    PRINT_UNKNOWN = -1,

    PRINT_SRC_AND_LOC,

    PRINT_SRC_ONLY,

    PRINT_NOTHING

  };

/* Tell what to do about this bpstat.  */

struct bpstat_what bpstat_what (bpstat);

/* Find the bpstat associated with a breakpoint.  NULL otherwise. */

bpstat bpstat_find_breakpoint (bpstat, struct breakpoint *);

/* Nonzero if a signal that we got in wait() was due to circumstances

   explained by the BS.  */

/* Currently that is true if we have hit a breakpoint, or if there is

   a watchpoint enabled.  */

#define bpstat_explains_signal(bs) ((bs) != NULL)

/* Nonzero is this bpstat causes a stop.  */

extern int bpstat_causes_stop (bpstat);

/* Nonzero if we should step constantly (e.g. watchpoints on machines

   without hardware support).  This isn't related to a specific bpstat,

   just to things like whether watchpoints are set.  */

extern int bpstat_should_step (void);

/* Print a message indicating what happened.  Returns nonzero to

   say that only the source line should be printed after this (zero

   return means print the frame as well as the source line).  */

extern enum print_stop_action bpstat_print (bpstat);

/* Put in *NUM the breakpoint number of the first breakpoint we are stopped

   at.  *BSP upon return is a bpstat which points to the remaining

   breakpoints stopped at (but which is not guaranteed to be good for

   anything but further calls to bpstat_num).

   Return 0 if passed a bpstat which does not indicate any breakpoints.

   Return -1 if stopped at a breakpoint that has been deleted since

   we set it.

   Return 1 otherwise.  */

extern int bpstat_num (bpstat *, int *);

/* Perform actions associated with the stopped inferior.  Actually, we

   just use this for breakpoint commands.  Perhaps other actions will

   go here later, but this is executed at a late time (from the

   command loop).  */

extern void bpstat_do_actions (void);

/* Modify BS so that the actions will not be performed.  */

extern void bpstat_clear_actions (bpstat);

/* Implementation:  */

/* Values used to tell the printing routine how to behave for this bpstat. */

enum bp_print_how

  {

    /* This is used when we want to do a normal printing of the reason

       for stopping. The output will depend on the type of eventpoint

       we are dealing with. This is the default value, most commonly

       used. */

    print_it_normal,

    /* This is used when nothing should be printed for this bpstat entry.  */

    print_it_noop,

    /* This is used when everything which needs to be printed has

       already been printed.  But we still want to print the frame.  */

    print_it_done

  };

struct bpstats

  {

    /* Linked list because there can be two breakpoints at the same

       place, and a bpstat reflects the fact that both have been hit.  */

    bpstat next;

    /* Breakpoint that we are at.  */

    const struct bp_location *breakpoint_at;

    /* The associated command list.  */

    struct counted_command_line *commands;

    /* Commands left to be done.  This points somewhere in

       base_command.  */

    struct command_line *commands_left;

    /* Old value associated with a watchpoint.  */

    struct value *old_val;

    /* Nonzero if this breakpoint tells us to print the frame.  */

    char print;

    /* Nonzero if this breakpoint tells us to stop.  */

    char stop;

    /* Tell bpstat_print and print_bp_stop_message how to print stuff

       associated with this element of the bpstat chain.  */

    enum bp_print_how print_it;

  };

enum inf_context

  {

    inf_starting,

    inf_running,

    inf_exited,

    inf_execd

  };

/* The possible return values for breakpoint_here_p.

   We guarantee that zero always means "no breakpoint here".  */

enum breakpoint_here

  {

    no_breakpoint_here = 0,

    ordinary_breakpoint_here,

    permanent_breakpoint_here

  };

/* Prototypes for breakpoint-related functions.  */

extern enum breakpoint_here breakpoint_here_p (struct address_space *, CORE_ADDR);

extern int moribund_breakpoint_here_p (struct address_space *, CORE_ADDR);

extern int breakpoint_inserted_here_p (struct address_space *, CORE_ADDR);

extern int regular_breakpoint_inserted_here_p (struct address_space *, CORE_ADDR);

extern int software_breakpoint_inserted_here_p (struct address_space *, CORE_ADDR);

/* Returns true if there's a hardware watchpoint or access watchpoint

   inserted in the range defined by ADDR and LEN.  */

extern int hardware_watchpoint_inserted_in_range (struct address_space *,

                                                  CORE_ADDR addr,

                                                  ULONGEST len);

extern int breakpoint_thread_match (struct address_space *, CORE_ADDR, ptid_t);

extern void until_break_command (char *, int, int);

extern void breakpoint_re_set (void);

extern void breakpoint_re_set_thread (struct breakpoint *);

extern struct breakpoint *set_momentary_breakpoint

  (struct gdbarch *, struct symtab_and_line, struct frame_id, enum bptype);

extern struct breakpoint *set_momentary_breakpoint_at_pc

  (struct gdbarch *, CORE_ADDR pc, enum bptype type);

extern struct breakpoint *clone_momentary_breakpoint (struct breakpoint *bpkt);

extern void set_ignore_count (int, int, int);

extern void set_default_breakpoint (int, struct program_space *,

                                    CORE_ADDR, struct symtab *, int);

extern void breakpoint_init_inferior (enum inf_context);

extern struct cleanup *make_cleanup_delete_breakpoint (struct breakpoint *);

extern void delete_breakpoint (struct breakpoint *);

extern void breakpoint_auto_delete (bpstat);

/* Return the chain of command lines to execute when this breakpoint

   is hit.  */