gdb/remote-notif.h

   1 /* Remote notification in GDB protocol
   2
   3    Copyright (C) 1988-2020 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 <list>
  24 #include <memory>
  25
  26 /* An event of a type of async remote notification.  */
  27
  28 struct notif_event
  29 {
  30   virtual ~notif_event ()
  31   {
  32   }
  33 };
  34
  35 /* A unique pointer holding a notif_event.  */
  36
  37 typedef std::unique_ptr<notif_event> notif_event_up;
  38
  39 /* ID of the notif_client.  */
  40
  41 enum REMOTE_NOTIF_ID
  42 {
  43   REMOTE_NOTIF_STOP = 0,
  44   REMOTE_NOTIF_LAST,
  45 };
  46
  47 struct remote_target;
  48
  49 /* A client to a sort of async remote notification.  */
  50
  51 struct notif_client
  52 {
  53   /* The name of notification packet.  */
  54   const char *name;
  55
  56   /* The packet to acknowledge a previous reply.  */
  57   const char *ack_command;
  58
  59   /* Parse BUF to get the expected event and update EVENT.  This
  60      function may throw exception if contents in BUF is not the
  61      expected event.  */
  62   void (*parse) (remote_target *remote,
  63                  struct notif_client *self, const char *buf,
  64                  struct notif_event *event);
  65
  66   /* Send field <ack_command> to remote, and do some checking.  If
  67      something wrong, throw an exception.  */
  68   void (*ack) (remote_target *remote,
  69                struct notif_client *self, const char *buf,
  70                struct notif_event *event);
  71
  72   /* Check this notification client can get pending events in
  73      'remote_notif_process'.  */
  74   int (*can_get_pending_events) (remote_target *remote,
  75                                  struct notif_client *self);
  76
  77   /* Allocate an event.  */
  78   notif_event_up (*alloc_event) ();
  79
  80   /* Id of this notif_client.  */
  81   const enum REMOTE_NOTIF_ID id;
  82 };
  83
  84 /* State on remote async notification.  */
  85
  86 struct remote_notif_state
  87 {
  88   remote_notif_state () = default;
  89   ~remote_notif_state ();
  90
  91   DISABLE_COPY_AND_ASSIGN (remote_notif_state);
  92
  93   /* The remote target.  */
  94   remote_target *remote;
  95
  96   /* Notification queue.  */
  97
  98   std::list<notif_client *> notif_queue;
  99
 100   /* Asynchronous signal handle registered as event loop source for when
 101      the remote sent us a notification.  The registered callback
 102      will do a ACK sequence to pull the rest of the events out of
 103      the remote side into our event queue.  */
 104
 105   struct async_event_handler *get_pending_events_token;
 106
 107   /* One pending event for each notification client.  This is where we
 108      keep it until it is acknowledged.  When there is a notification
 109      packet, parse it, and create an object of 'struct notif_event' to
 110      assign to it.  This field is unchanged until GDB starts to ack
 111      this notification (which is done by
 112      remote.c:remote_notif_pending_replies).  */
 113
 114   struct notif_event *pending_event[REMOTE_NOTIF_LAST] {};
 115 };
 116
 117 void remote_notif_ack (remote_target *remote, notif_client *nc,
 118                        const char *buf);
 119 struct notif_event *remote_notif_parse (remote_target *remote,
 120                                         notif_client *nc,
 121                                         const char *buf);
 122
 123 void handle_notification (struct remote_notif_state *notif_state,
 124                           const char *buf);
 125
 126 void remote_notif_process (struct remote_notif_state *state,
 127                            struct notif_client *except);
 128 remote_notif_state *remote_notif_state_allocate (remote_target *remote);
 129
 130 extern struct notif_client notif_client_stop;
 131
 132 extern bool notif_debug;
 133
 134 #endif /* REMOTE_NOTIF_H */