cabd4da684
Remove bpstat_momentary_breakpoint. This was always kludgy
and is no longer used.
* breakpoint.h: Add enum bpstat_what.
breakpoint.h (struct bpstat), breakpoint.c (bpstat_stop_status):
stop and print fields of bpstat now per-breakpoint, not just
one for the whole chain.
breakpoint.{c,h} (bpstat_what): New function.
breakpoint.h: Remove bpstat_stop and bpstat_should_print.
infrun.c: Replace switch (stop_bpstat->breakpoint_at->type)
with call to bpstat_what.
README: Remove watchpoint/breakpoint bug from known bugs.
* breakpoint.h: Prototype bpstat_find_breakpoint.
334 lines
11 KiB
C
334 lines
11 KiB
C
/* Data structures associated with breakpoints in GDB.
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Copyright (C) 1992 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#if !defined (BREAKPOINT_H)
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#define BREAKPOINT_H 1
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#include "frame.h"
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#include "value.h"
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/* This is the maximum number of bytes a breakpoint instruction can take.
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Feel free to increase it. It's just used in a few places to size
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arrays that should be independent of the target architecture. */
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#define BREAKPOINT_MAX 16
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/* The follow stuff is an abstract data type "bpstat" ("breakpoint status").
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This provides the ability to determine whether we have stopped at a
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breakpoint, and what we should do about it. */
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typedef struct bpstat *bpstat;
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/* Interface: */
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/* Clear a bpstat so that it says we are not at any breakpoint.
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Also free any storage that is part of a bpstat. */
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extern void bpstat_clear PARAMS ((bpstat *));
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/* Return a copy of a bpstat. Like "bs1 = bs2" but all storage that
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is part of the bpstat is copied as well. */
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extern bpstat bpstat_copy PARAMS ((bpstat));
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/* Get a bpstat associated with having just stopped at address *PC
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and frame address FRAME_ADDRESS. Update *PC to point at the
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breakpoint (if we hit a breakpoint). */
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/* FIXME: prototypes uses equivalence between FRAME_ADDR and CORE_ADDR */
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extern bpstat bpstat_stop_status PARAMS ((CORE_ADDR *, CORE_ADDR));
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/* Return values from bpstat_what. */
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enum bpstat_what {
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/* Perform various other tests; that is, this bpstat does not
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say to perform any action (e.g. failed watchpoint and nothing
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else). */
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BPSTAT_WHAT_KEEP_CHECKING,
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/* Rather than distinguish between noisy and silent stops here, it
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might be cleaner to have bpstat_print make that decision (also
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taking into account stop_print_frame and source_only). But the
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implications are a bit scary (interaction with auto-displays, etc.),
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so I won't try it. */
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/* Stop silently. */
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BPSTAT_WHAT_STOP_SILENT,
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/* Stop and print. */
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BPSTAT_WHAT_STOP_NOISY,
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/* Remove breakpoints, single step once, then put them back in and
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go back to what we were doing. */
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BPSTAT_WHAT_SINGLE,
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/* Set longjmp_resume breakpoint, remove all other breakpoints,
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and continue. The "remove all other breakpoints" part is required
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if we are also stepping over another breakpoint as well as doing
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the longjmp handling. */
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BPSTAT_WHAT_SET_LONGJMP_RESUME,
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/* Clear longjmp_resume breakpoint, then handle as
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BPSTAT_WHAT_KEEP_CHECKING. */
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BPSTAT_WHAT_CLEAR_LONGJMP_RESUME,
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/* Clear longjmp_resume breakpoint, then handle as BPSTAT_WHAT_SINGLE. */
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BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE,
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/* This is just used to keep track of how many enums there are. */
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BPSTAT_WHAT_LAST
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};
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/* Tell what to do about this bpstat. */
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enum bpstat_what bpstat_what PARAMS ((bpstat));
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/* Find the bpstat associated with a breakpoint. NULL otherwise. */
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bpstat bpstat_find_breakpoint PARAMS ((bpstat, struct breakpoint *));
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/* Nonzero if a signal that we got in wait() was due to circumstances
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explained by the BS. */
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/* Currently that is true if we have hit a breakpoint, or if there is
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a watchpoint enabled. */
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#define bpstat_explains_signal(bs) ((bs) != NULL)
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/* Nonzero if we should step constantly (e.g. watchpoints on machines
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without hardware support). This isn't related to a specific bpstat,
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just to things like whether watchpoints are set. */
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extern int bpstat_should_step PARAMS ((void));
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/* Print a message indicating what happened. Returns nonzero to
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say that only the source line should be printed after this (zero
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return means print the frame as well as the source line). */
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extern int bpstat_print PARAMS ((bpstat));
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/* Return the breakpoint number of the first breakpoint we are stopped
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at. *BSP upon return is a bpstat which points to the remaining
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breakpoints stopped at (but which is not guaranteed to be good for
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anything but further calls to bpstat_num).
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Return 0 if passed a bpstat which does not indicate any breakpoints. */
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extern int bpstat_num PARAMS ((bpstat *));
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/* Perform actions associated with having stopped at *BSP. */
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extern void bpstat_do_actions PARAMS ((bpstat *));
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/* Modify BS so that the actions will not be performed. */
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extern void bpstat_clear_actions PARAMS ((bpstat));
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/* Implementation: */
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struct bpstat
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{
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/* Linked list because there can be two breakpoints at the
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same place, and a bpstat reflects the fact that both have been hit. */
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bpstat next;
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/* Breakpoint that we are at. */
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struct breakpoint *breakpoint_at;
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/* Commands left to be done. */
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struct command_line *commands;
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/* Old value associated with a watchpoint. */
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value old_val;
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/* Nonzero if this breakpoint tells us to print the frame. */
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char print;
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/* Nonzero if this breakpoint tells us to stop. */
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char stop;
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/* Function called by bpstat_print to print stuff associated with
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this element of the bpstat chain. Returns 0 or 1 just like
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bpstat_print, or -1 if it can't deal with it. */
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int (*print_it) PARAMS((bpstat bs));
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};
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/* Type of breakpoint. */
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/* FIXME In the future, we should fold all other breakpoint-like things into
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here. This includes:
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1) single-step (for machines where we have to simulate single stepping),
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2) step-resume (for 'next'ing over subroutine calls),
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3) call-dummy (the breakpoint at the end of a subroutine stub that gdb
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uses to call functions in the target).
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I definately agree with (2) and (3); I'm not as sure about (1)
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(it is a low-level thing, perhaps the best thing is that it looks
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as much as possible like a single-step to wait_for_inferior)
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-kingdon, 8 Apr 93.
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*/
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enum bptype {
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bp_breakpoint, /* Normal breakpoint */
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bp_until, /* used by until command */
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bp_finish, /* used by finish command */
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bp_watchpoint, /* Watchpoint */
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bp_longjmp, /* secret breakpoint to find longjmp() */
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bp_longjmp_resume /* secret breakpoint to escape longjmp() */
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};
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/* States of enablement of breakpoint. */
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enum enable { disabled, enabled};
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/* Disposition of breakpoint. Ie: what to do after hitting it. */
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enum bpdisp {
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delete, /* Delete it */
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disable, /* Disable it */
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donttouch /* Leave it alone */
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};
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/* Note that the ->silent field is not currently used by any commands
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(though the code is in there if it was to be, and set_raw_breakpoint
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does set it to 0). I implemented it because I thought it would be
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useful for a hack I had to put in; I'm going to leave it in because
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I can see how there might be times when it would indeed be useful */
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/* This is for a breakpoint or a watchpoint. */
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struct breakpoint
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{
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struct breakpoint *next;
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/* Type of breakpoint. */
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enum bptype type;
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/* Zero means disabled; remember the info but don't break here. */
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enum enable enable;
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/* What to do with this breakpoint after we hit it. */
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enum bpdisp disposition;
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/* Number assigned to distinguish breakpoints. */
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int number;
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/* Address to break at, or NULL if not a breakpoint. */
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CORE_ADDR address;
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/* Line number of this address. Redundant. Only matters if address
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is non-NULL. */
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int line_number;
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/* Symtab of file of this address. Redundant. Only matters if address
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is non-NULL. */
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struct symtab *symtab;
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/* Non-zero means a silent breakpoint (don't print frame info
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if we stop here). */
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unsigned char silent;
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/* Number of stops at this breakpoint that should
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be continued automatically before really stopping. */
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int ignore_count;
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/* "Real" contents of byte where breakpoint has been inserted.
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Valid only when breakpoints are in the program. Under the complete
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control of the target insert_breakpoint and remove_breakpoint routines.
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No other code should assume anything about the value(s) here. */
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char shadow_contents[BREAKPOINT_MAX];
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/* Nonzero if this breakpoint is now inserted. Only matters if address
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is non-NULL. */
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char inserted;
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/* Nonzero if this is not the first breakpoint in the list
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for the given address. Only matters if address is non-NULL. */
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char duplicate;
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/* Chain of command lines to execute when this breakpoint is hit. */
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struct command_line *commands;
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/* Stack depth (address of frame). If nonzero, break only if fp
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equals this. */
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FRAME_ADDR frame;
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/* Conditional. Break only if this expression's value is nonzero. */
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struct expression *cond;
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/* String we used to set the breakpoint (malloc'd). Only matters if
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address is non-NULL. */
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char *addr_string;
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/* String form of the breakpoint condition (malloc'd), or NULL if there
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is no condition. */
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char *cond_string;
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/* String form of exp (malloc'd), or NULL if none. */
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char *exp_string;
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/* The expression we are watching, or NULL if not a watchpoint. */
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struct expression *exp;
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/* The largest block within which it is valid, or NULL if it is
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valid anywhere (e.g. consists just of global symbols). */
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struct block *exp_valid_block;
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/* Value of the watchpoint the last time we checked it. */
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value val;
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};
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/* Prototypes for breakpoint-related functions. */
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#ifdef __STDC__ /* Forward declarations for prototypes */
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struct frame_info;
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#endif
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extern int
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breakpoint_here_p PARAMS ((CORE_ADDR));
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extern void
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until_break_command PARAMS ((char *, int));
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extern void
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breakpoint_re_set PARAMS ((void));
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extern void
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clear_momentary_breakpoints PARAMS ((void));
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/* FIXME: Prototype uses equivalence of "struct frame_info *" and FRAME */
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extern struct breakpoint *
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set_momentary_breakpoint PARAMS ((struct symtab_and_line,
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struct frame_info *,
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enum bptype));
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extern void
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set_ignore_count PARAMS ((int, int, int));
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extern void
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set_default_breakpoint PARAMS ((int, CORE_ADDR, struct symtab *, int));
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extern void
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mark_breakpoints_out PARAMS ((void));
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extern void
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delete_breakpoint PARAMS ((struct breakpoint *));
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extern void
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breakpoint_auto_delete PARAMS ((bpstat));
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extern void
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breakpoint_clear_ignore_counts PARAMS ((void));
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extern void
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break_command PARAMS ((char *, int));
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extern int
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insert_breakpoints PARAMS ((void));
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extern int
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remove_breakpoints PARAMS ((void));
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extern void
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enable_longjmp_breakpoint PARAMS ((void));
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extern void
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disable_longjmp_breakpoint PARAMS ((void));
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extern void
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set_longjmp_resume_breakpoint PARAMS ((CORE_ADDR, FRAME));
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/* The following are for displays, which aren't really breakpoints, but
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here is as good a place as any for them. */
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extern void
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disable_current_display PARAMS ((void));
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extern void
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do_displays PARAMS ((void));
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extern void
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disable_display PARAMS ((int));
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extern void
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clear_displays PARAMS ((void));
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#endif /* !defined (BREAKPOINT_H) */
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