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- /* Data structures associated with breakpoints in GDB.
- Copyright (C) 1992 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 2 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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #if !defined (BREAKPOINT_H)
- #define BREAKPOINT_H 1
-
- #include "frame.h"
- #include "value.h"
-
- /* 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 10
-
- /* The follow 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 bpstat *bpstat;
-
- /* Interface: */
- /* Clear a bpstat so that it says we are not at any breakpoint.
- Also free any storage that is part of a bpstat. */
- extern void bpstat_clear PARAMS ((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 PARAMS ((bpstat));
-
- /* Get a bpstat associated with having just stopped at address *PC
- and frame address FRAME_ADDRESS. Update *PC to point at the
- breakpoint (if we hit a breakpoint). */
- /* FIXME: prototypes uses equivalence between FRAME_ADDR and CORE_ADDR */
- extern bpstat bpstat_stop_status PARAMS ((CORE_ADDR *, CORE_ADDR));
-
- /* Nonzero if we should print the frame. */
- #define bpstat_should_print(bs) ((bs) != NULL && (bs)->print)
-
- /* Nonzero if we should stop. */
- #define bpstat_stop(bs) ((bs) != NULL && (bs)->stop)
-
- /* Find the bpstat associated with a breakpoint. NULL otherwise. */
- bpstat bpstat_find_breakpoint(/* bpstat, breakpoint */);
-
- /* Nonzero if we hit a momentary breakpoint. */
- #define bpstat_momentary_breakpoint(bs) ((bs) != NULL && (bs)->momentary)
-
- /* Nonzero if a signal that we got in wait() was due to circumstances
- explained by the BS. */
- /* Currently that is true iff we have hit a breakpoint. */
- #define bpstat_explains_signal(bs) ((bs) != NULL)
-
- /* 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 PARAMS ((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 int bpstat_print PARAMS ((bpstat));
-
- /* Return 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. */
- extern int bpstat_num PARAMS ((bpstat *));
-
- /* Perform actions associated with having stopped at *BSP. */
- extern void bpstat_do_actions PARAMS ((bpstat *));
-
- /* Modify BS so that the actions will not be performed. */
- extern void bpstat_clear_actions PARAMS ((bpstat));
-
- /* Implementation: */
- struct bpstat
- {
- /* 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. */
- struct breakpoint *breakpoint_at;
- /* Commands left to be done. */
- struct command_line *commands;
- /* Old value associated with a watchpoint. */
- value old_val;
- /* Nonzero if we should print the frame. Only significant for the first
- bpstat in the chain. */
- char print;
- /* Nonzero if we should stop. Only significant for the first bpstat in
- the chain. */
- char stop;
- /* Nonzero if we hit a momentary breakpoint. Only significant for the
- first bpstat in the chain. */
- char momentary;
- };
-
- /* Type of breakpoint. */
- /* FIXME In the future, we should fold all other breakpoint-like things into
- here. This includes:
-
- 1) single-step (for machines where we have to simulate single stepping),
- 2) step-resume (for 'next'ing over subroutine calls),
- 3) call-dummy (the breakpoint at the end of a subroutine stub that gdb
- uses to call functions in the target).
- */
-
- enum bptype {
- bp_breakpoint, /* Normal breakpoint */
- bp_until, /* used by until command */
- bp_finish, /* used by finish command */
- bp_watchpoint, /* Watchpoint */
- bp_longjmp, /* secret breakpoint to find longjmp() */
- bp_longjmp_resume /* secret breakpoint to escape longjmp() */
- };
-
- /* States of enablement of breakpoint. */
-
- enum enable { disabled, enabled};
-
- /* Disposition of breakpoint. Ie: what to do after hitting it. */
-
- enum bpdisp {
- delete, /* Delete it */
- disable, /* Disable it */
- donttouch /* Leave it alone */
- };
-
- /* 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 enable;
- /* What to do with this breakpoint after we hit it. */
- enum bpdisp disposition;
- /* Number assigned to distinguish breakpoints. */
- int number;
- /* Address to break at, or NULL if not a breakpoint. */
- CORE_ADDR address;
- /* Line number of this address. Redundant. Only matters if address
- is non-NULL. */
- int line_number;
- /* Symtab of file of this address. Redundant. Only matters if address
- is non-NULL. */
- struct symtab *symtab;
- /* 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;
- /* "Real" contents of byte where breakpoint has been inserted.
- Valid only when breakpoints are in the program. Under the complete
- control of the target insert_breakpoint and remove_breakpoint routines.
- No other code should assume anything about the value(s) here. */
- char shadow_contents[BREAKPOINT_MAX];
- /* Nonzero if this breakpoint is now inserted. Only matters if address
- is non-NULL. */
- char inserted;
- /* Nonzero if this is not the first breakpoint in the list
- for the given address. Only matters if address is non-NULL. */
- char duplicate;
- /* Chain of command lines to execute when this breakpoint is hit. */
- struct command_line *commands;
- /* Stack depth (address of frame). If nonzero, break only if fp
- equals this. */
- FRAME_ADDR frame;
- /* Conditional. Break only if this expression's value is nonzero. */
- struct expression *cond;
-
- /* String we used to set the breakpoint (malloc'd). Only matters if
- address is non-NULL. */
- char *addr_string;
- /* String form of the breakpoint condition (malloc'd), or NULL if there
- is no condition. */
- char *cond_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;
- /* Value of the watchpoint the last time we checked it. */
- value val;
- };
-
- /* Prototypes for breakpoint-related functions. */
-
- #ifdef __STDC__ /* Forward declarations for prototypes */
- struct frame_info;
- #endif
-
- extern int
- breakpoint_here_p PARAMS ((CORE_ADDR));
-
- extern void
- until_break_command PARAMS ((char *, int));
-
- extern void
- breakpoint_re_set PARAMS ((void));
-
- extern void
- clear_momentary_breakpoints PARAMS ((void));
-
- /* FIXME: Prototype uses equivalence of "struct frame_info *" and FRAME */
- extern struct breakpoint *
- set_momentary_breakpoint PARAMS ((struct symtab_and_line,
- struct frame_info *,
- enum bptype));
-
- extern void
- set_ignore_count PARAMS ((int, int, int));
-
- extern void
- set_default_breakpoint PARAMS ((int, CORE_ADDR, struct symtab *, int));
-
- extern void
- mark_breakpoints_out PARAMS ((void));
-
- extern void
- delete_breakpoint PARAMS ((struct breakpoint *));
-
- extern void
- breakpoint_auto_delete PARAMS ((bpstat));
-
- extern void
- breakpoint_clear_ignore_counts PARAMS ((void));
-
- extern void
- break_command PARAMS ((char *, int));
-
- extern int
- insert_breakpoints PARAMS ((void));
-
- extern int
- remove_breakpoints PARAMS ((void));
-
- extern void
- enable_longjmp_breakpoint PARAMS ((void));
-
- extern void
- disable_longjmp_breakpoint PARAMS ((void));
-
- extern void
- set_longjmp_resume_breakpoint PARAMS ((CORE_ADDR, FRAME));
-
- /* The following are for displays, which aren't really breakpoints, but
- here is as good a place as any for them. */
-
- extern void
- disable_current_display PARAMS ((void));
-
- extern void
- do_displays PARAMS ((void));
-
- extern void
- disable_display PARAMS ((int));
-
- extern void
- clear_displays PARAMS ((void));
-
- #endif /* !defined (BREAKPOINT_H) */
-