don't allocate serial_ops

Now that struct serial_ops is const everywhere, we can easily turn the
instances into globals.  This patch implements this idea.

On the one hand I think this is nicer since it makes a bit more data
readonly and slightly reduces allocations.  On the other hand it
reduces readability somewhat.

If the readability is a concern to anyone I was thinking I could write
a macro that conditionally uses GCC's designated initializer
extension.

Tested by rebuilding on x86-64 Fedora 18, both natively and using the
mingw cross tools.

2013-12-19  Tom Tromey  <tromey@redhat.com>

	* ser-unix.c (hardwire_ops): New global.
	(_initialize_ser_hardwire): Use it.
	* ser-tcp.c (tcp_ops): New global.
	(_initialize_ser_tcp): Use it.
	* ser-pipe.c (pipe_ops): New global.
	(_initialize_ser_pipe): Use it.
	* ser-mingw.c (hardwire_ops, tty_ops, pipe_ops, tcp_ops): New
	globals.
	(_initialize_ser_windows): Use them.

1 files changed, 126 insertions, 107 deletions

diff --git a/gdb/ser-mingw.c b/gdb/ser-mingw.c
index eef40ce..13522dd 100644
--- a/gdb/ser-mingw.c
+++ b/gdb/ser-mingw.c
@@ -1210,6 +1210,128 @@ net_windows_close (struct serial *scb)
   net_close (scb);
 }
 
+/* The serial port driver.  */
+
+static const struct serial_ops hardwire_ops =
+{
+  "hardwire",
+  ser_windows_open,
+  ser_windows_close,
+  NULL,
+  ser_base_readchar,
+  ser_base_write,
+  ser_windows_flush_output,
+  ser_windows_flush_input,
+  ser_windows_send_break,
+  ser_windows_raw,
+  /* These are only used for stdin; we do not need them for serial
+     ports, so supply the standard dummies.  */
+  ser_base_get_tty_state,
+  ser_base_copy_tty_state,
+  ser_base_set_tty_state,
+  ser_base_print_tty_state,
+  ser_base_noflush_set_tty_state,
+  ser_windows_setbaudrate,
+  ser_windows_setstopbits,
+  ser_windows_drain_output,
+  ser_base_async,
+  ser_windows_read_prim,
+  ser_windows_write_prim,
+  NULL,
+  ser_windows_wait_handle
+};
+
+/* The dummy serial driver used for terminals.  We only provide the
+   TTY-related methods.  */
+
+static const struct serial_ops tty_ops =
+{
+  "terminal",
+  NULL,
+  ser_console_close,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  ser_console_get_tty_state,
+  ser_base_copy_tty_state,
+  ser_base_set_tty_state,
+  ser_base_print_tty_state,
+  ser_base_noflush_set_tty_state,
+  NULL,
+  NULL,
+  ser_base_drain_output,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  ser_console_wait_handle,
+  ser_console_done_wait_handle
+};
+
+/* The pipe interface.  */
+
+static const struct serial_ops pipe_ops =
+{
+  "pipe",
+  pipe_windows_open,
+  pipe_windows_close,
+  pipe_windows_fdopen,
+  ser_base_readchar,
+  ser_base_write,
+  ser_base_flush_output,
+  ser_base_flush_input,
+  ser_base_send_break,
+  ser_base_raw,
+  ser_base_get_tty_state,
+  ser_base_copy_tty_state,
+  ser_base_set_tty_state,
+  ser_base_print_tty_state,
+  ser_base_noflush_set_tty_state,
+  ser_base_setbaudrate,
+  ser_base_setstopbits,
+  ser_base_drain_output,
+  ser_base_async,
+  pipe_windows_read,
+  pipe_windows_write,
+  pipe_avail,
+  pipe_wait_handle,
+  pipe_done_wait_handle
+};
+
+/* The TCP/UDP socket driver.  */
+
+static const struct serial_ops tcp_ops =
+{
+  "tcp",
+  net_windows_open,
+  net_windows_close,
+  NULL,
+  ser_base_readchar,
+  ser_base_write,
+  ser_base_flush_output,
+  ser_base_flush_input,
+  ser_tcp_send_break,
+  ser_base_raw,
+  ser_base_get_tty_state,
+  ser_base_copy_tty_state,
+  ser_base_set_tty_state,
+  ser_base_print_tty_state,
+  ser_base_noflush_set_tty_state,
+  ser_base_setbaudrate,
+  ser_base_setstopbits,
+  ser_base_drain_output,
+  ser_base_async,
+  net_read_prim,
+  net_write_prim,
+  NULL,
+  net_windows_wait_handle,
+  net_windows_done_wait_handle
+};
+
 void
 _initialize_ser_windows (void)
 {
@@ -1228,88 +1350,9 @@ _initialize_ser_windows (void)
   else
     CancelIo = NULL;
 
-  /* Now register the serial port driver.  */
-  ops = XMALLOC (struct serial_ops);
-  memset (ops, 0, sizeof (struct serial_ops));
-  ops->name = "hardwire";
-  ops->open = ser_windows_open;
-  ops->close = ser_windows_close;
-
-  ops->flush_output = ser_windows_flush_output;
-  ops->flush_input = ser_windows_flush_input;
-  ops->send_break = ser_windows_send_break;
-
-  /* These are only used for stdin; we do not need them for serial
-     ports, so supply the standard dummies.  */
-  ops->get_tty_state = ser_base_get_tty_state;
-  ops->copy_tty_state = ser_base_copy_tty_state;
-  ops->set_tty_state = ser_base_set_tty_state;
-  ops->print_tty_state = ser_base_print_tty_state;
-  ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
-
-  ops->go_raw = ser_windows_raw;
-  ops->setbaudrate = ser_windows_setbaudrate;
-  ops->setstopbits = ser_windows_setstopbits;
-  ops->drain_output = ser_windows_drain_output;
-  ops->readchar = ser_base_readchar;
-  ops->write = ser_base_write;
-  ops->async = ser_base_async;
-  ops->read_prim = ser_windows_read_prim;
-  ops->write_prim = ser_windows_write_prim;
-  ops->wait_handle = ser_windows_wait_handle;
-
-  serial_add_interface (ops);
-
-  /* Next create the dummy serial driver used for terminals.  We only
-     provide the TTY-related methods.  */
-
-  ops = XMALLOC (struct serial_ops);
-  memset (ops, 0, sizeof (struct serial_ops));
-
-  ops->name = "terminal";
-
-  ops->close = ser_console_close;
-  ops->get_tty_state = ser_console_get_tty_state;
-  ops->copy_tty_state = ser_base_copy_tty_state;
-  ops->set_tty_state = ser_base_set_tty_state;
-  ops->print_tty_state = ser_base_print_tty_state;
-  ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
-  ops->drain_output = ser_base_drain_output;
-  ops->wait_handle = ser_console_wait_handle;
-  ops->done_wait_handle = ser_console_done_wait_handle;
-
-  serial_add_interface (ops);
-
-  /* The pipe interface.  */
-
-  ops = XMALLOC (struct serial_ops);
-  memset (ops, 0, sizeof (struct serial_ops));
-  ops->name = "pipe";
-  ops->open = pipe_windows_open;
-  ops->close = pipe_windows_close;
-  ops->fdopen = pipe_windows_fdopen;
-  ops->readchar = ser_base_readchar;
-  ops->write = ser_base_write;
-  ops->flush_output = ser_base_flush_output;
-  ops->flush_input = ser_base_flush_input;
-  ops->send_break = ser_base_send_break;
-  ops->go_raw = ser_base_raw;
-  ops->get_tty_state = ser_base_get_tty_state;
-  ops->copy_tty_state = ser_base_copy_tty_state;
-  ops->set_tty_state = ser_base_set_tty_state;
-  ops->print_tty_state = ser_base_print_tty_state;
-  ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
-  ops->setbaudrate = ser_base_setbaudrate;
-  ops->setstopbits = ser_base_setstopbits;
-  ops->drain_output = ser_base_drain_output;
-  ops->async = ser_base_async;
-  ops->read_prim = pipe_windows_read;
-  ops->write_prim = pipe_windows_write;
-  ops->wait_handle = pipe_wait_handle;
-  ops->done_wait_handle = pipe_done_wait_handle;
-  ops->avail = pipe_avail;
-
-  serial_add_interface (ops);
+  serial_add_interface (&hardwire_ops);
+  serial_add_interface (&tty_ops);
+  serial_add_interface (&pipe_ops);
 
   /* If WinSock works, register the TCP/UDP socket driver.  */
 
@@ -1317,29 +1360,5 @@ _initialize_ser_windows (void)
     /* WinSock is unavailable.  */
     return;
 
-  ops = XMALLOC (struct serial_ops);
-  memset (ops, 0, sizeof (struct serial_ops));
-  ops->name = "tcp";
-  ops->open = net_windows_open;
-  ops->close = net_windows_close;
-  ops->readchar = ser_base_readchar;
-  ops->write = ser_base_write;
-  ops->flush_output = ser_base_flush_output;
-  ops->flush_input = ser_base_flush_input;
-  ops->send_break = ser_tcp_send_break;
-  ops->go_raw = ser_base_raw;
-  ops->get_tty_state = ser_base_get_tty_state;
-  ops->copy_tty_state = ser_base_copy_tty_state;
-  ops->set_tty_state = ser_base_set_tty_state;
-  ops->print_tty_state = ser_base_print_tty_state;
-  ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
-  ops->setbaudrate = ser_base_setbaudrate;
-  ops->setstopbits = ser_base_setstopbits;
-  ops->drain_output = ser_base_drain_output;
-  ops->async = ser_base_async;
-  ops->read_prim = net_read_prim;
-  ops->write_prim = net_write_prim;
-  ops->wait_handle = net_windows_wait_handle;
-  ops->done_wait_handle = net_windows_done_wait_handle;
-  serial_add_interface (ops);
+  serial_add_interface (&tcp_ops);
 }