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author | Simon Marchi <simon.marchi@efficios.com> | 2020-02-13 16:27:51 -0500 |
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committer | Simon Marchi <simon.marchi@efficios.com> | 2020-02-13 16:27:51 -0500 |
commit | feacfcacaac9f7e62f467a33c4ae54c56501ed18 (patch) | |
tree | 0e083366350e9fd279bec8c7b12413c90b9f255d /gdbserver/notif.cc | |
parent | 06b3c5bdb018262d7c09cda9d4637015c7ebe779 (diff) | |
download | binutils-feacfcacaac9f7e62f467a33c4ae54c56501ed18.zip binutils-feacfcacaac9f7e62f467a33c4ae54c56501ed18.tar.gz binutils-feacfcacaac9f7e62f467a33c4ae54c56501ed18.tar.bz2 |
gdbserver: rename source files to .cc
For the same reasons outlined in the previous patch, this patch renames
gdbserver source files to .cc.
I have moved the "-x c++" switch to only those rules that require it.
gdbserver/ChangeLog:
* Makefile.in: Rename source files from .c to .cc.
* %.c: Rename to %.cc.
* configure.ac: Rename server.c to server.cc.
* configure: Re-generate.
Diffstat (limited to 'gdbserver/notif.cc')
-rw-r--r-- | gdbserver/notif.cc | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/gdbserver/notif.cc b/gdbserver/notif.cc new file mode 100644 index 0000000..e18cecd --- /dev/null +++ b/gdbserver/notif.cc @@ -0,0 +1,154 @@ +/* Notification to GDB. + Copyright (C) 1989-2020 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +/* Async notifications to GDB. When the state of remote target is + changed or something interesting to GDB happened, async + notifications are used to tell GDB. + + Each type of notification is represented by an object + 'struct notif_server', in which there is a queue for events to GDB + represented by 'struct notif_event'. GDBserver writes (by means of + 'write' field) each event in the queue into the buffer and send the + contents in buffer to GDB. The contents in buffer is specified in + RSP. See more in the comments to field 'queue' of + 'struct notif_server'. + + Here is the workflow of sending events and managing queue: + 1. At any time, when something interesting FOO happens, a object + of 'struct notif_event' or its sub-class EVENT is created for FOO. + + 2. Enque EVENT to the 'queue' field of 'struct notif_server' for + FOO and send corresponding notification packet to GDB if EVENT is + the first one. + #1 and #2 are done by function 'notif_push'. + + 3. EVENT is not deque'ed until the ack of FOO from GDB arrives. + Before ack of FOO arrives, FOO happens again, a new object of + EVENT is created and enque EVENT silently. + Once GDB has a chance to ack to FOO, it sends an ack to GDBserver, + and GDBserver repeatedly sends events to GDB and gets ack of FOO, + until queue is empty. Then, GDBserver sends 'OK' to GDB that all + queued notification events are done. + + # 3 is done by function 'handle_notif_ack'. */ + +#include "server.h" +#include "notif.h" + +static struct notif_server *notifs[] = +{ + ¬if_stop, +}; + +/* Write another event or an OK, if there are no more left, to + OWN_BUF. */ + +void +notif_write_event (struct notif_server *notif, char *own_buf) +{ + if (!notif->queue.empty ()) + { + struct notif_event *event = notif->queue.front (); + + notif->write (event, own_buf); + } + else + write_ok (own_buf); +} + +/* Handle the ack in buffer OWN_BUF,and packet length is PACKET_LEN. + Return 1 if the ack is handled, and return 0 if the contents + in OWN_BUF is not a ack. */ + +int +handle_notif_ack (char *own_buf, int packet_len) +{ + size_t i; + struct notif_server *np; + + for (i = 0; i < ARRAY_SIZE (notifs); i++) + { + const char *ack_name = notifs[i]->ack_name; + + if (startswith (own_buf, ack_name) + && packet_len == strlen (ack_name)) + break; + } + + if (i == ARRAY_SIZE (notifs)) + return 0; + + np = notifs[i]; + + /* If we're waiting for GDB to acknowledge a pending event, + consider that done. */ + if (!np->queue.empty ()) + { + struct notif_event *head = np->queue.front (); + np->queue.pop_front (); + + if (remote_debug) + debug_printf ("%s: acking %d\n", np->ack_name, + (int) np->queue.size ()); + + delete head; + } + + notif_write_event (np, own_buf); + + return 1; +} + +/* Put EVENT to the queue of NOTIF. */ + +void +notif_event_enque (struct notif_server *notif, + struct notif_event *event) +{ + notif->queue.push_back (event); + + if (remote_debug) + debug_printf ("pending events: %s %d\n", notif->notif_name, + (int) notif->queue.size ()); + +} + +/* Push one event NEW_EVENT of notification NP into NP->queue. */ + +void +notif_push (struct notif_server *np, struct notif_event *new_event) +{ + bool is_first_event = np->queue.empty (); + + /* Something interesting. Tell GDB about it. */ + notif_event_enque (np, new_event); + + /* If this is the first stop reply in the queue, then inform GDB + about it, by sending a corresponding notification. */ + if (is_first_event) + { + char buf[PBUFSIZ]; + char *p = buf; + + xsnprintf (p, PBUFSIZ, "%s:", np->notif_name); + p += strlen (p); + + np->write (new_event, p); + putpkt_notif (buf); + } +} |