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125 lines
3.9 KiB
C++
125 lines
3.9 KiB
C++
/* Marshalling and unmarshalling.
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Copyright (C) 2014-2024 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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#ifndef CC1_PLUGIN_MARSHALL_HH
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#define CC1_PLUGIN_MARSHALL_HH
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#include <type_traits>
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#include "status.hh"
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#include "gcc-interface.h"
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namespace cc1_plugin
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{
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class connection;
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// Only a single kind of integer is ever sent over the wire, and
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// this is it.
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typedef unsigned long long protocol_int;
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// Read an integer from the connection and verify that it has the
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// value V.
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status unmarshall_check (connection *, protocol_int v);
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// Write an integer, prefixed with the integer type marker, to the
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// connection.
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status marshall_intlike (connection *, protocol_int);
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// Read a type marker from the connection and verify that it is an
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// integer type marker. If not, return FAIL. If so, read an
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// integer store it in the out argument.
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status unmarshall_intlike (connection *, protocol_int *);
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status marshall_array_start (connection *, char, size_t);
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status marshall_array_elmts (connection *, size_t, void *);
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status unmarshall_array_start (connection *, char, size_t *);
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status unmarshall_array_elmts (connection *, size_t, void *);
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// An "empty" marshall call -- used to handle the base case for some
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// variadic templates.
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static inline
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status marshall (connection *)
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{
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return OK;
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}
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// A template function that can handle marshalling various integer
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// objects to the connection.
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template<typename T>
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status marshall (connection *conn, T scalar)
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{
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return marshall_intlike (conn, scalar);
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}
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// A template function that can handle unmarshalling various integer
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// objects from the connection. Note that there's no way at the
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// protocol level to distinguish different int types.
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template<typename T>
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status unmarshall (connection *conn, T *scalar,
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typename std::enable_if<std::is_integral<T>::value, T>::type * = 0)
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{
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protocol_int result;
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if (!unmarshall_intlike (conn, &result))
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return FAIL;
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*scalar = (T) result;
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return OK;
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}
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// A template function that can handle unmarshalling various enum
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// objects from the connection.
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template<typename T>
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status unmarshall (connection *conn, T *e_val,
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typename std::enable_if<std::is_enum<T>::value, T>::type * = 0)
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{
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protocol_int result;
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if (!unmarshall_intlike (conn, &result))
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return FAIL;
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*e_val = (T) result;
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return OK;
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}
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// Send a string type marker followed by a string.
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status marshall (connection *, const char *);
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// Read a string type marker followed by a string. The caller is
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// responsible for freeing the resulting string using 'delete[]'.
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status unmarshall (connection *, char **);
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// Send a gcc_type_array marker followed by the array.
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status marshall (connection *, const gcc_type_array *);
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// Read a gcc_type_array marker, followed by a gcc_type_array. The
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// resulting array must be freed by the caller, using 'delete[]' on
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// the elements, and 'delete' on the array object itself.
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status unmarshall (connection *, struct gcc_type_array **);
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template<typename T1, typename T2, typename... Arg>
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status marshall (connection *c, T1 arg1, T2 arg2, Arg... rest)
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{
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if (!marshall (c, arg1))
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return FAIL;
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return marshall (c, arg2, rest...);
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}
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};
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#endif // CC1_PLUGIN_MARSHALL_HH
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