gdb/gdb-events.c

   1 /* User Interface Events.
   2    Copyright 1999 Free Software Foundation, Inc.
   3
   4    Contributed by Cygnus Solutions.
   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, Boston, MA 02111-1307, USA.  */
  21
  22 /* Work in progress */
  23
  24 /* This file was created with the aid of ``gdb-events.sh''.
  25
  26    The bourn shell script ``gdb-events.sh'' creates the files
  27    ``new-gdb-events.c'' and ``new-gdb-events.h and then compares
  28    them against the existing ``gdb-events.[hc]''.  Any differences
  29    found being reported.
  30
  31    If editing this file, please also run gdb-events.sh and merge any
  32    changes into that script. Conversely, when making sweeping changes
  33    to this file, modifying gdb-events.sh and using its output may
  34    prove easier. */
  35
  36
  37 #include "defs.h"
  38 #include "gdb-events.h"
  39 #include "gdbcmd.h"
  40
  41 #undef XMALLOC
  42 #define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE)))
  43
  44 #if WITH_GDB_EVENTS
  45 static struct gdb_events null_event_hooks;
  46 static struct gdb_events queue_event_hooks;
  47 static struct gdb_events *current_event_hooks = &null_event_hooks;
  48 #endif
  49
  50 int gdb_events_debug;
  51
  52 #if WITH_GDB_EVENTS
  53
  54 void
  55 breakpoint_create_event (int b)
  56 {
  57   if (gdb_events_debug)
  58     fprintf_unfiltered (gdb_stdlog, "breakpoint_create_event\n");
  59   if (!current_event_hooks->breakpoint_create)
  60     return;
  61   current_event_hooks->breakpoint_create (b);
  62 }
  63
  64 void
  65 breakpoint_delete_event (int b)
  66 {
  67   if (gdb_events_debug)
  68     fprintf_unfiltered (gdb_stdlog, "breakpoint_delete_event\n");
  69   if (!current_event_hooks->breakpoint_delete)
  70     return;
  71   current_event_hooks->breakpoint_delete (b);
  72 }
  73
  74 void
  75 breakpoint_modify_event (int b)
  76 {
  77   if (gdb_events_debug)
  78     fprintf_unfiltered (gdb_stdlog, "breakpoint_modify_event\n");
  79   if (!current_event_hooks->breakpoint_modify)
  80     return;
  81   current_event_hooks->breakpoint_modify (b);
  82 }
  83
  84 #endif
  85
  86 #if WITH_GDB_EVENTS
  87 struct gdb_events *
  88 set_gdb_event_hooks (struct gdb_events *vector)
  89 {
  90   struct gdb_events *old_events = current_event_hooks;
  91   if (vector == NULL)
  92     current_event_hooks = &queue_event_hooks;
  93   else
  94     current_event_hooks = vector;
  95   return old_events;
  96 }
  97 #endif
  98
  99 enum gdb_event
 100 {
 101   breakpoint_create,
 102   breakpoint_delete,
 103   breakpoint_modify,
 104   nr_gdb_events
 105 };
 106
 107 struct breakpoint_create
 108   {
 109     int b;
 110   };
 111
 112 struct breakpoint_delete
 113   {
 114     int b;
 115   };
 116
 117 struct breakpoint_modify
 118   {
 119     int b;
 120   };
 121
 122 struct event
 123   {
 124     enum gdb_event type;
 125     struct event *next;
 126     union
 127       {
 128         struct breakpoint_create breakpoint_create;
 129         struct breakpoint_delete breakpoint_delete;
 130         struct breakpoint_modify breakpoint_modify;
 131       }
 132     data;
 133   };
 134 struct event *pending_events;
 135 struct event *delivering_events;
 136
 137 static void
 138 append (struct event *new_event)
 139 {
 140   struct event **event = &pending_events;
 141   while ((*event) != NULL)
 142     event = &((*event)->next);
 143   (*event) = new_event;
 144   (*event)->next = NULL;
 145 }
 146
 147 static void
 148 queue_breakpoint_create (int b)
 149 {
 150   struct event *event = XMALLOC (struct event);
 151   event->type = breakpoint_create;
 152   event->data.breakpoint_create.b = b;
 153   append (event);
 154 }
 155
 156 static void
 157 queue_breakpoint_delete (int b)
 158 {
 159   struct event *event = XMALLOC (struct event);
 160   event->type = breakpoint_delete;
 161   event->data.breakpoint_delete.b = b;
 162   append (event);
 163 }
 164
 165 static void
 166 queue_breakpoint_modify (int b)
 167 {
 168   struct event *event = XMALLOC (struct event);
 169   event->type = breakpoint_modify;
 170   event->data.breakpoint_modify.b = b;
 171   append (event);
 172 }
 173
 174 void
 175 gdb_events_deliver (struct gdb_events *vector)
 176 {
 177   /* Just zap any events left around from last time. */
 178   while (delivering_events != NULL)
 179     {
 180       struct event *event = delivering_events;
 181       delivering_events = event->next;
 182       xfree (event);
 183     }
 184   /* Process any pending events.  Because one of the deliveries could
 185      bail out we move everything off of the pending queue onto an
 186      in-progress queue where it can, later, be cleaned up if
 187      necessary. */
 188   delivering_events = pending_events;
 189   pending_events = NULL;
 190   while (delivering_events != NULL)
 191     {
 192       struct event *event = delivering_events;
 193       switch (event->type)
 194         {
 195         case breakpoint_create:
 196           vector->breakpoint_create
 197             (event->data.breakpoint_create.b);
 198           break;
 199         case breakpoint_delete:
 200           vector->breakpoint_delete
 201             (event->data.breakpoint_delete.b);
 202           break;
 203         case breakpoint_modify:
 204           vector->breakpoint_modify
 205             (event->data.breakpoint_modify.b);
 206           break;
 207         }
 208       delivering_events = event->next;
 209       xfree (event);
 210     }
 211 }
 212
 213 void _initialize_gdb_events (void);
 214 void
 215 _initialize_gdb_events (void)
 216 {
 217   struct cmd_list_element *c;
 218 #if WITH_GDB_EVENTS
 219   queue_event_hooks.breakpoint_create = queue_breakpoint_create;
 220   queue_event_hooks.breakpoint_delete = queue_breakpoint_delete;
 221   queue_event_hooks.breakpoint_modify = queue_breakpoint_modify;
 222 #endif
 223
 224   c = add_set_cmd ("eventdebug", class_maintenance, var_zinteger,
 225                    (char *) (&gdb_events_debug), "Set event debugging.\n\
 226 When non-zero, event/notify debugging is enabled.", &setlist);
 227   deprecate_cmd (c, "set debug event");
 228   deprecate_cmd (add_show_from_set (c, &showlist), "show debug event");
 229
 230   add_show_from_set (add_set_cmd ("event",
 231                                   class_maintenance,
 232                                   var_zinteger,
 233                                   (char *) (&gdb_events_debug),
 234                                   "Set event debugging.\n\
 235 When non-zero, event/notify debugging is enabled.", &setdebuglist),
 236                      &showdebuglist);
 237 }