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/* Marshalling and unmarshalling.
Copyright (C) 2014-2022 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_MARSHALL_HH
#define CC1_PLUGIN_MARSHALL_HH
#include <type_traits>
#include "status.hh"
#include "gcc-interface.h"
namespace cc1_plugin
{
class connection;
// Only a single kind of integer is ever sent over the wire, and
// this is it.
typedef unsigned long long protocol_int;
// Read an integer from the connection and verify that it has the
// value V.
status unmarshall_check (connection *, protocol_int v);
// Write an integer, prefixed with the integer type marker, to the
// connection.
status marshall_intlike (connection *, protocol_int);
// Read a type marker from the connection and verify that it is an
// integer type marker. If not, return FAIL. If so, read an
// integer store it in the out argument.
status unmarshall_intlike (connection *, protocol_int *);
status marshall_array_start (connection *, char, size_t);
status marshall_array_elmts (connection *, size_t, void *);
status unmarshall_array_start (connection *, char, size_t *);
status unmarshall_array_elmts (connection *, size_t, void *);
// An "empty" marshall call -- used to handle the base case for some
// variadic templates.
static inline
status marshall (connection *)
{
return OK;
}
// A template function that can handle marshalling various integer
// objects to the connection.
template<typename T>
status marshall (connection *conn, T scalar)
{
return marshall_intlike (conn, scalar);
}
// A template function that can handle unmarshalling various integer
// objects from the connection. Note that there's no way at the
// protocol level to distinguish different int types.
template<typename T>
status unmarshall (connection *conn, T *scalar,
typename std::enable_if<std::is_integral<T>::value, T>::type * = 0)
{
protocol_int result;
if (!unmarshall_intlike (conn, &result))
return FAIL;
*scalar = (T) result;
return OK;
}
// A template function that can handle unmarshalling various enum
// objects from the connection.
template<typename T>
status unmarshall (connection *conn, T *e_val,
typename std::enable_if<std::is_enum<T>::value, T>::type * = 0)
{
protocol_int result;
if (!unmarshall_intlike (conn, &result))
return FAIL;
*e_val = (T) result;
return OK;
}
// Send a string type marker followed by a string.
status marshall (connection *, const char *);
// Read a string type marker followed by a string. The caller is
// responsible for freeing the resulting string using 'delete[]'.
status unmarshall (connection *, char **);
// Send a gcc_type_array marker followed by the array.
status marshall (connection *, const gcc_type_array *);
// Read a gcc_type_array marker, followed by a gcc_type_array. The
// resulting array must be freed by the caller, using 'delete[]' on
// the elements, and 'delete' on the array object itself.
status unmarshall (connection *, struct gcc_type_array **);
template<typename T1, typename T2, typename... Arg>
status marshall (connection *c, T1 arg1, T2 arg2, Arg... rest)
{
if (!marshall (c, arg1))
return FAIL;
return marshall (c, arg2, rest...);
}
};
#endif // CC1_PLUGIN_MARSHALL_HH
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