/* Data structures associated with breakpoints in GDB.
- Copyright (C) 1992 Free Software Foundation, Inc.
+ Copyright (C) 1992, 93, 94, 95, 96, 1998 Free Software Foundation, Inc.
This file is part of GDB.
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. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#if !defined (BREAKPOINT_H)
#define BREAKPOINT_H 1
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 signal handlers. */
bp_through_sigtramp,
+ /* 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
(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
+ bp_call_dummy,
+
+ /* 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,
+
+ /* These breakpoints are used to implement the "catch load" command
+ on platforms whose dynamic linkers support such functionality. */
+ bp_catch_load,
+
+ /* These breakpoints are used to implement the "catch unload" command
+ on platforms whose dynamic linkers support such functionality. */
+ bp_catch_unload,
+
+ /* These are not really breakpoints, but are catchpoints that
+ implement the "catch fork", "catch vfork" and "catch exec" commands
+ on platforms whose kernel support such functionality. (I.e.,
+ kernels which can raise an event when a fork or exec occurs, as
+ opposed to the debugger setting breakpoints on functions named
+ "fork" or "exec".) */
+ bp_catch_fork,
+ bp_catch_vfork,
+ bp_catch_exec,
+
+ /* These are catchpoints to implement "catch catch" and "catch throw"
+ commands for C++ exception handling. */
+ bp_catch_catch,
+ bp_catch_throw,
+
+
};
/* States of enablement of breakpoint. */
-enum enable { disabled, enabled};
+enum enable {
+ disabled, /* The eventpoint is inactive, and cannot trigger. */
+ enabled, /* The eventpoint is active, and can trigger. */
+ shlib_disabled, /* The eventpoint's address is within an unloaded solib.
+ The eventpoint will be automatically enabled & reset
+ when that solib is loaded. */
+ 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
+ & reset when the call "lands" (either completes, or
+ stops at another eventpoint). */
+};
+
/* Disposition of breakpoint. Ie: what to do after hitting it. */
enum bpdisp {
- delete, /* Delete it */
+ del, /* Delete it */
+ del_at_next_stop, /* Delete at next stop, whether hit or not */
disable, /* Disable it */
donttouch /* Leave it alone */
};
struct command_line *commands;
/* Stack depth (address of frame). If nonzero, break only if fp
equals this. */
- FRAME_ADDR frame;
+ CORE_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;
+ /* 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;
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;
+ value_ptr val;
+
+ /* Holds the value chain for a hardware watchpoint expression. */
+ value_ptr val_chain;
+
+ /* 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. */
+ CORE_ADDR watchpoint_frame;
+
/* Thread number for thread-specific breakpoint, or -1 if don't care */
int thread;
+
+ /* 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;
+
+ /* Filename of a dynamically-linked library (dll), used for bp_catch_load
+ and bp_catch_unload (malloc'd), or NULL if any library is significant. */
+ char * dll_pathname;
+
+ /* Filename of a dll whose state change (e.g., load or unload)
+ triggered this catchpoint. This field is only vaid immediately
+ after this catchpoint has triggered. */
+ char * triggered_dll_pathname;
+
+ /* Process id of a child process whose forking triggered this catchpoint.
+ This field is only vaid immediately after this catchpoint has triggered. */
+ int forked_inferior_pid;
+
+ /* Filename of a program whose exec triggered this catchpoint. This
+ field is only vaid immediately after this catchpoint has triggered. */
+ char * exec_pathname;
+
+ asection *section;
};
\f
/* 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 bpstat *bpstat;
+typedef struct bpstats *bpstat;
/* Interface: */
/* Clear a bpstat so that it says we are not at any breakpoint.
is part of the bpstat is copied as well. */
extern bpstat bpstat_copy PARAMS ((bpstat));
-/* FIXME: prototypes uses equivalence between FRAME_ADDR and CORE_ADDR */
-extern bpstat bpstat_stop_status PARAMS ((CORE_ADDR *, CORE_ADDR, int));
+extern bpstat bpstat_stop_status PARAMS ((CORE_ADDR *, int));
\f
/* This bpstat_what stuff tells wait_for_inferior what to do with a
breakpoint (a challenging task). */
checking. */
BPSTAT_WHAT_THROUGH_SIGTRAMP,
+ /* Check the dynamic linker's data structures for new libraries, then
+ keep checking. */
+ BPSTAT_WHAT_CHECK_SHLIBS,
+
+ /* Check the dynamic linker's data structures for new libraries, then
+ resume out of the dynamic linker's callback, stop and print. */
+ BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK,
+
/* This is just used to keep track of how many enums there are. */
BPSTAT_WHAT_LAST
};
/* Find the bpstat associated with a breakpoint. NULL otherwise. */
bpstat bpstat_find_breakpoint PARAMS ((bpstat, struct breakpoint *));
+/* Find a step_resume breakpoint associated with this bpstat.
+ (If there are multiple step_resume bp's on the list, this function
+ will arbitrarily pick one.)
+
+ It is an error to use this function if BPSTAT doesn't contain a
+ step_resume breakpoint.
+
+ See wait_for_inferior's use of this function.
+ */
+extern struct breakpoint *
+bpstat_find_step_resume_breakpoint PARAMS ((bpstat));
+
/* 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
just to things like whether watchpoints are set. */
extern int bpstat_should_step PARAMS ((void));
+/* Nonzero if there are enabled hardware watchpoints. */
+extern int bpstat_have_active_hw_watchpoints 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). */
/* Modify BS so that the actions will not be performed. */
extern void bpstat_clear_actions PARAMS ((bpstat));
+/* Given a bpstat that records zero or more triggered eventpoints, this
+ function returns another bpstat which contains only the catchpoints
+ on that first list, if any.
+ */
+extern void bpstat_get_triggered_catchpoints PARAMS ((bpstat, bpstat *));
+
/* Implementation: */
-struct bpstat
+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. */
/* Commands left to be done. */
struct command_line *commands;
/* Old value associated with a watchpoint. */
- value old_val;
+ value_ptr old_val;
/* Nonzero if this breakpoint tells us to print the frame. */
char print;
bpstat_print, or -1 if it can't deal with it. */
int (*print_it) PARAMS((bpstat bs));
};
+
+enum inf_context
+{
+ inf_starting,
+ inf_running,
+ inf_exited
+};
+
\f
/* Prototypes for breakpoint-related functions. */
extern int breakpoint_here_p PARAMS ((CORE_ADDR));
+extern int breakpoint_inserted_here_p PARAMS ((CORE_ADDR));
+
extern int frame_in_dummy PARAMS ((struct frame_info *));
extern int breakpoint_thread_match PARAMS ((CORE_ADDR, int));
-extern void
-until_break_command PARAMS ((char *, int));
+extern void until_break_command PARAMS ((char *, int));
-extern void
-breakpoint_re_set PARAMS ((void));
+extern void breakpoint_re_set PARAMS ((void));
-extern void
-clear_momentary_breakpoints PARAMS ((void));
+extern void breakpoint_re_set_thread PARAMS ((struct breakpoint *));
-/* 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 struct breakpoint *set_momentary_breakpoint
+ PARAMS ((struct symtab_and_line, struct frame_info *, enum bptype));
-extern void
-set_default_breakpoint PARAMS ((int, CORE_ADDR, struct symtab *, int));
+extern void set_ignore_count PARAMS ((int, int, int));
-extern void
-mark_breakpoints_out PARAMS ((void));
+extern void set_default_breakpoint PARAMS ((int, CORE_ADDR, struct symtab *, int));
-extern void
-breakpoint_init_inferior PARAMS ((void));
+extern void mark_breakpoints_out PARAMS ((void));
-extern void
-delete_breakpoint PARAMS ((struct breakpoint *));
+extern void breakpoint_init_inferior PARAMS ((enum inf_context));
-extern void
-breakpoint_auto_delete PARAMS ((bpstat));
+extern void delete_breakpoint PARAMS ((struct breakpoint *));
-extern void
-breakpoint_clear_ignore_counts PARAMS ((void));
+extern void breakpoint_auto_delete PARAMS ((bpstat));
-extern void
-break_command PARAMS ((char *, int));
+extern void breakpoint_clear_ignore_counts PARAMS ((void));
-extern int
-insert_breakpoints PARAMS ((void));
+extern void break_command PARAMS ((char *, int));
-extern int
-remove_breakpoints PARAMS ((void));
+extern void tbreak_command PARAMS ((char *, int));
-extern void
-enable_longjmp_breakpoint PARAMS ((void));
+extern int insert_breakpoints PARAMS ((void));
+
+extern int remove_breakpoints PARAMS ((void));
+
+/* This function can be used to physically insert eventpoints from the
+ specified traced inferior process, without modifying the breakpoint
+ package's state. This can be useful for those targets which support
+ following the processes of a fork() or vfork() system call, when both
+ of the resulting two processes are to be followed. */
+extern int reattach_breakpoints PARAMS ((int));
+
+/* This function can be used to update the breakpoint package's state
+ after an exec() system call has been executed.
+
+ This function causes the following:
+
+ - All eventpoints are marked "not inserted".
+ - All eventpoints with a symbolic address are reset such that
+ the symbolic address must be reevaluated before the eventpoints
+ can be reinserted.
+ - The solib breakpoints are explicitly removed from the breakpoint
+ list.
+ - A step-resume breakpoint, if any, is explicitly removed from the
+ breakpoint list.
+ - All eventpoints without a symbolic address are removed from the
+ breakpoint list. */
+extern void update_breakpoints_after_exec PARAMS ((void));
+
+/* This function can be used to physically remove hardware breakpoints
+ and watchpoints from the specified traced inferior process, without
+ modifying the breakpoint package's state. This can be useful for
+ those targets which support following the processes of a fork() or
+ vfork() system call, when one of the resulting two processes is to
+ be detached and allowed to run free.
+
+ It is an error to use this function on the process whose id is
+ inferior_pid. */
+extern int detach_breakpoints PARAMS ((int));
+
+extern void enable_longjmp_breakpoint PARAMS ((void));
+
+extern void disable_longjmp_breakpoint PARAMS ((void));
+
+extern void set_longjmp_resume_breakpoint PARAMS ((CORE_ADDR,
+ struct frame_info *));
+/* These functions respectively disable or reenable all currently
+ enabled watchpoints. When disabled, the watchpoints are marked
+ call_disabled. When reenabled, they are marked enabled.
+
+ The intended client of these functions is infcmd.c\run_stack_dummy.
+
+ The inferior must be stopped, and all breakpoints removed, when
+ these functions are used.
+
+ The need for these functions is that on some targets (e.g., HP-UX),
+ gdb is unable to unwind through the dummy frame that is pushed as
+ part of the implementation of a call command. Watchpoints can
+ cause the inferior to stop in places where this frame is visible,
+ and that can cause execution control to become very confused.
+ Note that if a user sets breakpoints in an interactively call
+ function, the call_disabled watchpoints will have been reenabled
+ when the first such breakpoint is reached. However, on targets
+ that are unable to unwind through the call dummy frame, watches
+ of stack-based storage may then be deleted, because gdb will
+ believe that their watched storage is out of scope. (Sigh.) */
extern void
-disable_longjmp_breakpoint PARAMS ((void));
+disable_watchpoints_before_interactive_call_start PARAMS ((void));
extern void
-set_longjmp_resume_breakpoint PARAMS ((CORE_ADDR, FRAME));
+enable_watchpoints_after_interactive_call_stop PARAMS ((void));
+
+extern void clear_breakpoint_hit_counts PARAMS ((void));
+
/* 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 disable_current_display PARAMS ((void));
-extern void
-do_displays PARAMS ((void));
+extern void do_displays PARAMS ((void));
-extern void
-disable_display PARAMS ((int));
+extern void disable_display PARAMS ((int));
-extern void
-clear_displays PARAMS ((void));
+extern void clear_displays PARAMS ((void));
+
+extern void disable_breakpoint PARAMS ((struct breakpoint *));
+
+extern void enable_breakpoint PARAMS ((struct breakpoint *));
+
+extern void create_solib_event_breakpoint PARAMS ((CORE_ADDR));
+
+extern void remove_solib_event_breakpoints PARAMS ((void));
+
+extern void disable_breakpoints_in_shlibs PARAMS ((void));
+
+extern void re_enable_breakpoints_in_shlibs PARAMS ((void));
+
+extern void create_solib_load_event_breakpoint PARAMS ((char *, int, char *, char *));
+
+extern void create_solib_unload_event_breakpoint PARAMS ((char *, int, char *, char *));
+
+extern void create_fork_event_catchpoint PARAMS ((int, char *));
+
+extern void create_vfork_event_catchpoint PARAMS ((int, char *));
+
+extern void create_exec_event_catchpoint PARAMS ((int, char *));
+
+/* This function returns TRUE if ep is a catchpoint. */
+extern int ep_is_catchpoint PARAMS ((struct breakpoint *));
+
+/* This function returns TRUE if ep is a catchpoint of a
+ shared library (aka dynamically-linked library) event,
+ such as a library load or unload. */
+extern int ep_is_shlib_catchpoint PARAMS ((struct breakpoint *));
+
+extern struct breakpoint *set_breakpoint_sal PARAMS ((struct symtab_and_line));
#endif /* !defined (BREAKPOINT_H) */
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