gdb/remote-notif.h

   1 /* Remote notification in GDB protocol
   2
   3    Copyright (C) 1988-2019 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef REMOTE_NOTIF_H
  21 #define REMOTE_NOTIF_H
  22
  23 #include "queue.h"
  24
  25 /* An event of a type of async remote notification.  */
  26
  27 struct notif_event
  28 {
  29   /* Destructor.  Release everything from SELF, but not SELF
  30      itself.  */
  31   void (*dtr) (struct notif_event *self);
  32 };
  33
  34 /* ID of the notif_client.  */
  35
  36 enum REMOTE_NOTIF_ID
  37 {
  38   REMOTE_NOTIF_STOP = 0,
  39   REMOTE_NOTIF_LAST,
  40 };
  41
  42 struct remote_target;
  43
  44 /* A client to a sort of async remote notification.  */
  45
  46 typedef struct notif_client
  47 {
  48   /* The name of notification packet.  */
  49   const char *name;
  50
  51   /* The packet to acknowledge a previous reply.  */
  52   const char *ack_command;
  53
  54   /* Parse BUF to get the expected event and update EVENT.  This
  55      function may throw exception if contents in BUF is not the
  56      expected event.  */
  57   void (*parse) (remote_target *remote,
  58                  struct notif_client *self, char *buf,
  59                  struct notif_event *event);
  60
  61   /* Send field <ack_command> to remote, and do some checking.  If
  62      something wrong, throw an exception.  */
  63   void (*ack) (remote_target *remote,
  64                struct notif_client *self, char *buf,
  65                struct notif_event *event);
  66
  67   /* Check this notification client can get pending events in
  68      'remote_notif_process'.  */
  69   int (*can_get_pending_events) (remote_target *remote,
  70                                  struct notif_client *self);
  71
  72   /* Allocate an event.  */
  73   struct notif_event *(*alloc_event) (void);
  74
  75   /* Id of this notif_client.  */
  76   const enum REMOTE_NOTIF_ID id;
  77 } *notif_client_p;
  78
  79 DECLARE_QUEUE_P (notif_client_p);
  80
  81 /* State on remote async notification.  */
  82
  83 struct remote_notif_state
  84 {
  85   /* The remote target.  */
  86   remote_target *remote;
  87
  88   /* Notification queue.  */
  89
  90   QUEUE(notif_client_p) *notif_queue;
  91
  92   /* Asynchronous signal handle registered as event loop source for when
  93      the remote sent us a notification.  The registered callback
  94      will do a ACK sequence to pull the rest of the events out of
  95      the remote side into our event queue.  */
  96
  97   struct async_event_handler *get_pending_events_token;
  98
  99 /* One pending event for each notification client.  This is where we
 100    keep it until it is acknowledged.  When there is a notification
 101    packet, parse it, and create an object of 'struct notif_event' to
 102    assign to it.  This field is unchanged until GDB starts to ack
 103    this notification (which is done by
 104    remote.c:remote_notif_pending_replies).  */
 105
 106   struct notif_event *pending_event[REMOTE_NOTIF_LAST];
 107 };
 108
 109 void remote_notif_ack (remote_target *remote, notif_client *nc, char *buf);
 110 struct notif_event *remote_notif_parse (remote_target *remote,
 111                                         notif_client *nc,
 112                                         char *buf);
 113
 114 void notif_event_xfree (struct notif_event *event);
 115
 116 void handle_notification (struct remote_notif_state *notif_state,
 117                           char *buf);
 118
 119 void remote_notif_process (struct remote_notif_state *state,
 120                            struct notif_client *except);
 121 remote_notif_state *remote_notif_state_allocate (remote_target *remote);
 122 void remote_notif_state_xfree (struct remote_notif_state *state);
 123
 124 extern struct notif_client notif_client_stop;
 125
 126 extern int notif_debug;
 127
 128 #endif /* REMOTE_NOTIF_H */