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 void
  88 set_gdb_event_hooks (struct gdb_events *vector)
  89 {
  90   if (vector == NULL)
  91     current_event_hooks = &queue_event_hooks;
  92   else
  93     current_event_hooks = vector;
  94 }
  95 #endif
  96
  97 enum gdb_event
  98   {
  99     breakpoint_create,
 100     breakpoint_delete,
 101     breakpoint_modify,
 102     nr_gdb_events
 103   };
 104
 105 struct breakpoint_create
 106   {
 107     int b;
 108   };
 109
 110 struct breakpoint_delete
 111   {
 112     int b;
 113   };
 114
 115 struct breakpoint_modify
 116   {
 117     int b;
 118   };
 119
 120 struct event
 121   {
 122     enum gdb_event type;
 123     struct event *next;
 124     union
 125       {
 126         struct breakpoint_create breakpoint_create;
 127         struct breakpoint_delete breakpoint_delete;
 128         struct breakpoint_modify breakpoint_modify;
 129       }
 130     data;
 131   };
 132 struct event *pending_events;
 133 struct event *delivering_events;
 134
 135 static void
 136 append (struct event *new_event)
 137 {
 138   struct event **event = &pending_events;
 139   while ((*event) != NULL)
 140     event = &((*event)->next);
 141   (*event) = new_event;
 142   (*event)->next = NULL;
 143 }
 144
 145 static void
 146 queue_breakpoint_create (int b)
 147 {
 148   struct event *event = XMALLOC (struct event);
 149   event->type = breakpoint_create;
 150   event->data.breakpoint_create.b = b;
 151   append (event);
 152 }
 153
 154 static void
 155 queue_breakpoint_delete (int b)
 156 {
 157   struct event *event = XMALLOC (struct event);
 158   event->type = breakpoint_delete;
 159   event->data.breakpoint_delete.b = b;
 160   append (event);
 161 }
 162
 163 static void
 164 queue_breakpoint_modify (int b)
 165 {
 166   struct event *event = XMALLOC (struct event);
 167   event->type = breakpoint_modify;
 168   event->data.breakpoint_modify.b = b;
 169   append (event);
 170 }
 171
 172 void
 173 gdb_events_deliver (struct gdb_events *vector)
 174 {
 175   /* Just zap any events left around from last time. */
 176   while (delivering_events != NULL)
 177     {
 178       struct event *event = delivering_events;
 179       delivering_events = event->next;
 180       free (event);
 181     }
 182   /* Process any pending events.  Because one of the deliveries could
 183      bail out we move everything off of the pending queue onto an
 184      in-progress queue where it can, later, be cleaned up if
 185      necessary. */
 186   delivering_events = pending_events;
 187   pending_events = NULL;
 188   while (delivering_events != NULL)
 189     {
 190       struct event *event = delivering_events;
 191       switch (event->type)
 192         {
 193         case breakpoint_create:
 194           vector->breakpoint_create
 195             (event->data.breakpoint_create.b);
 196           break;
 197         case breakpoint_delete:
 198           vector->breakpoint_delete
 199             (event->data.breakpoint_delete.b);
 200           break;
 201         case breakpoint_modify:
 202           vector->breakpoint_modify
 203             (event->data.breakpoint_modify.b);
 204           break;
 205         }
 206       delivering_events = event->next;
 207       free (event);
 208     }
 209 }
 210
 211 void _initialize_gdb_events (void);
 212 void
 213 _initialize_gdb_events (void)
 214 {
 215 #if WITH_GDB_EVENTS
 216   queue_event_hooks.breakpoint_create = queue_breakpoint_create;
 217   queue_event_hooks.breakpoint_delete = queue_breakpoint_delete;
 218   queue_event_hooks.breakpoint_modify = queue_breakpoint_modify;
 219 #endif
 220   add_show_from_set (add_set_cmd ("eventdebug",
 221                                   class_maintenance,
 222                                   var_zinteger,
 223                                   (char *)&gdb_events_debug,
 224                                   "Set event debugging.\n\
 225 When non-zero, event/notify debugging is enabled.", &setlist),
 226                      &showlist);
 227 }