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/* RPC call and callback templates
Copyright (C) 2014 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef CC1_PLUGIN_RPC_HH
#define CC1_PLUGIN_RPC_HH
#include "status.hh"
#include "marshall.hh"
#include "connection.hh"
namespace cc1_plugin
{
// The plugin API may contain some "const" method parameters.
// However, when unmarshalling we cannot unmarshall into a const
// object; and furthermore we want to be able to deallocate pointers
// when finished with them. This wrapper class lets us properly
// remove the "const" and handle deallocation from pointer types.
template<typename T>
class argument_wrapper
{
public:
argument_wrapper () { }
~argument_wrapper () { }
operator T () const { return m_object; }
status unmarshall (connection *conn)
{
return ::cc1_plugin::unmarshall (conn, &m_object);
}
private:
T m_object;
// No copying or assignment allowed.
argument_wrapper (const argument_wrapper &);
argument_wrapper &operator= (const argument_wrapper &);
};
// Specialization for any kind of pointer. This is declared but not
// defined to avoid bugs if a new pointer type is introduced into
// the API. Instead you will just get a compilation error.
template<typename T>
class argument_wrapper<const T *>;
// Specialization for string types.
template<>
class argument_wrapper<const char *>
{
public:
argument_wrapper () : m_object (NULL) { }
~argument_wrapper ()
{
delete[] m_object;
}
operator const char * () const
{
return m_object;
}
status unmarshall (connection *conn)
{
return ::cc1_plugin::unmarshall (conn, &m_object);
}
private:
char *m_object;
// No copying or assignment allowed.
argument_wrapper (const argument_wrapper &);
argument_wrapper &operator= (const argument_wrapper &);
};
// Specialization for gcc_type_array.
template<>
class argument_wrapper<const gcc_type_array *>
{
public:
argument_wrapper () : m_object (NULL) { }
~argument_wrapper ()
{
// It would be nicer if gcc_type_array could have a destructor.
// But, it is in code shared with gdb and cannot.
if (m_object != NULL)
delete[] m_object->elements;
delete m_object;
}
operator const gcc_type_array * () const
{
return m_object;
}
status unmarshall (connection *conn)
{
return ::cc1_plugin::unmarshall (conn, &m_object);
}
private:
gcc_type_array *m_object;
// No copying or assignment allowed.
argument_wrapper (const argument_wrapper &);
argument_wrapper &operator= (const argument_wrapper &);
};
// There are two kinds of template functions here: "call" and
// "callback". They are each repeated multiple times to handle
// different numbers of arguments. (This would be improved with
// C++11, though applying a call is still tricky until C++14 can be
// used.)
// The "call" template is used for making a remote procedure call.
// It starts a query ('Q') packet, marshalls its arguments, waits
// for a result, and finally reads and returns the result via an
// "out" parameter.
// The "callback" template is used when receiving a remote procedure
// call. This template function is suitable for use with the
// "callbacks" and "connection" classes. It decodes incoming
// arguments, passes them to the wrapped function, and finally
// marshalls a reply packet.
template<typename R>
status
call (connection *conn, const char *method, R *result)
{
if (!conn->send ('Q'))
return FAIL;
if (!marshall (conn, method))
return FAIL;
if (!marshall (conn, 0))
return FAIL;
if (!conn->wait_for_result ())
return FAIL;
if (!unmarshall (conn, result))
return FAIL;
return OK;
}
template<typename R, R (*func) (connection *)>
status
callback (connection *conn)
{
R result;
if (!unmarshall_check (conn, 0))
return FAIL;
result = func (conn);
if (!conn->send ('R'))
return FAIL;
return marshall (conn, result);
}
template<typename R, typename A>
status
call (connection *conn, const char *method, R *result, A arg)
{
if (!conn->send ('Q'))
return FAIL;
if (!marshall (conn, method))
return FAIL;
if (!marshall (conn, 1))
return FAIL;
if (!marshall (conn, arg))
return FAIL;
if (!conn->wait_for_result ())
return FAIL;
if (!unmarshall (conn, result))
return FAIL;
return OK;
}
template<typename R, typename A, R (*func) (connection *, A)>
status
callback (connection *conn)
{
argument_wrapper<A> arg;
R result;
if (!unmarshall_check (conn, 1))
return FAIL;
if (!arg.unmarshall (conn))
return FAIL;
result = func (conn, arg);
if (!conn->send ('R'))
return FAIL;
return marshall (conn, result);
}
template<typename R, typename A1, typename A2>
status
call (connection *conn, const char *method, R *result, A1 arg1, A2 arg2)
{
if (!conn->send ('Q'))
return FAIL;
if (!marshall (conn, method))
return FAIL;
if (!marshall (conn, 2))
return FAIL;
if (!marshall (conn, arg1))
return FAIL;
if (!marshall (conn, arg2))
return FAIL;
if (!conn->wait_for_result ())
return FAIL;
if (!unmarshall (conn, result))
return FAIL;
return OK;
}
template<typename R, typename A1, typename A2, R (*func) (connection *,
A1, A2)>
status
callback (connection *conn)
{
argument_wrapper<A1> arg1;
argument_wrapper<A2> arg2;
R result;
if (!unmarshall_check (conn, 2))
return FAIL;
if (!arg1.unmarshall (conn))
return FAIL;
if (!arg2.unmarshall (conn))
return FAIL;
result = func (conn, arg1, arg2);
if (!conn->send ('R'))
return FAIL;
return marshall (conn, result);
}
template<typename R, typename A1, typename A2, typename A3>
status
call (connection *conn, const char *method, R *result, A1 arg1, A2 arg2,
A3 arg3)
{
if (!conn->send ('Q'))
return FAIL;
if (!marshall (conn, method))
return FAIL;
if (!marshall (conn, 3))
return FAIL;
if (!marshall (conn, arg1))
return FAIL;
if (!marshall (conn, arg2))
return FAIL;
if (!marshall (conn, arg3))
return FAIL;
if (!conn->wait_for_result ())
return FAIL;
if (!unmarshall (conn, result))
return FAIL;
return OK;
}
template<typename R, typename A1, typename A2, typename A3,
R (*func) (connection *, A1, A2, A3)>
status
callback (connection *conn)
{
argument_wrapper<A1> arg1;
argument_wrapper<A2> arg2;
argument_wrapper<A3> arg3;
R result;
if (!unmarshall_check (conn, 3))
return FAIL;
if (!arg1.unmarshall (conn))
return FAIL;
if (!arg2.unmarshall (conn))
return FAIL;
if (!arg3.unmarshall (conn))
return FAIL;
result = func (conn, arg1, arg2, arg3);
if (!conn->send ('R'))
return FAIL;
return marshall (conn, result);
}
template<typename R, typename A1, typename A2, typename A3, typename A4>
status
call (connection *conn, const char *method, R *result, A1 arg1, A2 arg2,
A3 arg3, A4 arg4)
{
if (!conn->send ('Q'))
return FAIL;
if (!marshall (conn, method))
return FAIL;
if (!marshall (conn, 4))
return FAIL;
if (!marshall (conn, arg1))
return FAIL;
if (!marshall (conn, arg2))
return FAIL;
if (!marshall (conn, arg3))
return FAIL;
if (!marshall (conn, arg4))
return FAIL;
if (!conn->wait_for_result ())
return FAIL;
if (!unmarshall (conn, result))
return FAIL;
return OK;
}
template<typename R, typename A1, typename A2, typename A3, typename A4,
R (*func) (connection *, A1, A2, A3, A4)>
status
callback (connection *conn)
{
argument_wrapper<A1> arg1;
argument_wrapper<A2> arg2;
argument_wrapper<A3> arg3;
argument_wrapper<A4> arg4;
R result;
if (!unmarshall_check (conn, 4))
return FAIL;
if (!arg1.unmarshall (conn))
return FAIL;
if (!arg2.unmarshall (conn))
return FAIL;
if (!arg3.unmarshall (conn))
return FAIL;
if (!arg4.unmarshall (conn))
return FAIL;
result = func (conn, arg1, arg2, arg3, arg4);
if (!conn->send ('R'))
return FAIL;
return marshall (conn, result);
}
template<typename R, typename A1, typename A2, typename A3, typename A4,
typename A5>
status
call (connection *conn, const char *method, R *result, A1 arg1, A2 arg2,
A3 arg3, A4 arg4, A5 arg5)
{
if (!conn->send ('Q'))
return FAIL;
if (!marshall (conn, method))
return FAIL;
if (!marshall (conn, 5))
return FAIL;
if (!marshall (conn, arg1))
return FAIL;
if (!marshall (conn, arg2))
return FAIL;
if (!marshall (conn, arg3))
return FAIL;
if (!marshall (conn, arg4))
return FAIL;
if (!marshall (conn, arg5))
return FAIL;
if (!conn->wait_for_result ())
return FAIL;
if (!unmarshall (conn, result))
return FAIL;
return OK;
}
template<typename R, typename A1, typename A2, typename A3, typename A4,
typename A5, R (*func) (connection *, A1, A2, A3, A4, A5)>
status
callback (connection *conn)
{
argument_wrapper<A1> arg1;
argument_wrapper<A2> arg2;
argument_wrapper<A3> arg3;
argument_wrapper<A4> arg4;
argument_wrapper<A5> arg5;
R result;
if (!unmarshall_check (conn, 5))
return FAIL;
if (!arg1.unmarshall (conn))
return FAIL;
if (!arg2.unmarshall (conn))
return FAIL;
if (!arg3.unmarshall (conn))
return FAIL;
if (!arg4.unmarshall (conn))
return FAIL;
if (!arg5.unmarshall (conn))
return FAIL;
result = func (conn, arg1, arg2, arg3, arg4, arg5);
if (!conn->send ('R'))
return FAIL;
return marshall (conn, result);
}
template<typename R, typename A1, typename A2, typename A3, typename A4,
typename A5, typename A6, typename A7>
status
call (connection *conn, const char *method, R *result, A1 arg1, A2 arg2,
A3 arg3, A4 arg4, A5 arg5, A6 arg6, A7 arg7)
{
if (!conn->send ('Q'))
return FAIL;
if (!marshall (conn, method))
return FAIL;
if (!marshall (conn, 7))
return FAIL;
if (!marshall (conn, arg1))
return FAIL;
if (!marshall (conn, arg2))
return FAIL;
if (!marshall (conn, arg3))
return FAIL;
if (!marshall (conn, arg4))
return FAIL;
if (!marshall (conn, arg5))
return FAIL;
if (!marshall (conn, arg6))
return FAIL;
if (!marshall (conn, arg7))
return FAIL;
if (!conn->wait_for_result ())
return FAIL;
if (!unmarshall (conn, result))
return FAIL;
return OK;
}
template<typename R, typename A1, typename A2, typename A3, typename A4,
typename A5, typename A6, typename A7,
R (*func) (connection *, A1, A2, A3, A4, A5, A6, A7)>
status
callback (connection *conn)
{
argument_wrapper<A1> arg1;
argument_wrapper<A2> arg2;
argument_wrapper<A3> arg3;
argument_wrapper<A4> arg4;
argument_wrapper<A5> arg5;
argument_wrapper<A6> arg6;
argument_wrapper<A7> arg7;
R result;
if (!unmarshall_check (conn, 7))
return FAIL;
if (!arg1.unmarshall (conn))
return FAIL;
if (!arg2.unmarshall (conn))
return FAIL;
if (!arg3.unmarshall (conn))
return FAIL;
if (!arg4.unmarshall (conn))
return FAIL;
if (!arg5.unmarshall (conn))
return FAIL;
if (!arg6.unmarshall (conn))
return FAIL;
if (!arg7.unmarshall (conn))
return FAIL;
result = func (conn, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
if (!conn->send ('R'))
return FAIL;
return marshall (conn, result);
}
};
#endif // CC1_PLUGIN_RPC_HH
|
