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8fdffa48c5
This patch completes the transition of libcc1 from the use of separate template functions for different arities to the use of variadic functions. This is how I had wanted it to work from the very beginning, and is possible now with C++11. I had thought that variadic callbacks required C++17, but it turns out that the approach taken here is basically equivalent to std::apply -- just a bit wordier. libcc1 * rpc.hh (argument_wrapper) <get>: Replace cast operator. (argument_wrapper<T *>) <get>: Likewise. (unmarshall): Add std::tuple overloads. (callback): Remove. (class invoker): New. * libcp1plugin.cc (plugin_init): Update. * libcp1.cc (libcp1::add_callbacks): Update. * libcc1plugin.cc (plugin_init): Update. * libcc1.cc (libcc1::add_callbacks): Update. * connection.cc (cc1_plugin::connection::do_wait): Update.
146 lines
3.3 KiB
C++
146 lines
3.3 KiB
C++
/* Connect implementation
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Copyright (C) 2014-2021 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include <cc1plugin-config.h>
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#include <string>
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#include <unistd.h>
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#include <sys/types.h>
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#include <string.h>
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#include <errno.h>
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#include "marshall.hh"
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#include "connection.hh"
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#include "rpc.hh"
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cc1_plugin::status
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cc1_plugin::connection::send (char c)
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{
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if (write (m_fd, &c, 1) != 1)
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return FAIL;
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return OK;
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}
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cc1_plugin::status
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cc1_plugin::connection::send (const void *buf, int len)
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{
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if (write (m_fd, buf, len) != len)
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return FAIL;
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return OK;
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}
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cc1_plugin::status
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cc1_plugin::connection::require (char c)
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{
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char result;
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if (read (m_fd, &result, 1) != 1
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|| result != c)
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return FAIL;
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return OK;
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}
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cc1_plugin::status
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cc1_plugin::connection::get (void *buf, int len)
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{
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if (read (m_fd, buf, len) != len)
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return FAIL;
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return OK;
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}
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cc1_plugin::status
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cc1_plugin::connection::do_wait (bool want_result)
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{
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while (true)
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{
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char result;
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fd_set read_set;
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FD_ZERO (&read_set);
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FD_SET (m_fd, &read_set);
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if (m_aux_fd != -1)
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FD_SET (m_aux_fd, &read_set);
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int nfds = select (FD_SETSIZE, &read_set, NULL, NULL, NULL);
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if (nfds == -1)
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{
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if (errno == EINTR)
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continue;
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return FAIL;
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}
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// We have to check the stderr fd first, to avoid a possible
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// blocking scenario when do_wait is called reentrantly. In
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// such a call, if we handle the primary fd first, then we may
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// re-enter this function, read from gcc's stderr, causing the
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// outer invocation of this function to block when trying to
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// read.
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if (m_aux_fd != -1 && FD_ISSET (m_aux_fd, &read_set))
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{
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char buf[1024];
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int n = read (m_aux_fd, buf, sizeof (buf) - 1);
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if (n < 0)
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return FAIL;
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if (n > 0)
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{
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buf[n] = '\0';
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print (buf);
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}
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}
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if (FD_ISSET (m_fd, &read_set))
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{
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int n = read (m_fd, &result, 1);
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if (n == 0)
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return want_result ? FAIL : OK;
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if (n != 1)
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return FAIL;
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switch (result)
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{
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case 'R':
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// The reply is ready; the caller will unmarshall it.
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return want_result ? OK : FAIL;
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case 'Q':
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// While waiting for a reply, the other side made a method
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// call.
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{
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// Use an argument_wrapper here to simplify management
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// of the string's lifetime.
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argument_wrapper<char *> method_name;
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if (!method_name.unmarshall (this))
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return FAIL;
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callback_ftype *callback
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= m_callbacks.find_callback (method_name.get ());
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// The call to CALLBACK is where we may end up in a
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// reentrant call.
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if (callback == NULL || !callback (this))
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return FAIL;
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}
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break;
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default:
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return FAIL;
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}
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}
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}
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}
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