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111
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1 /* Marshalling and unmarshalling.
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2 Copyright (C) 2014-2018 Free Software Foundation, Inc.
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111
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef CC1_PLUGIN_MARSHALL_HH
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21 #define CC1_PLUGIN_MARSHALL_HH
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22
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23 #include "status.hh"
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24 #include "gcc-interface.h"
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25
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26 namespace cc1_plugin
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27 {
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28 class connection;
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29
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30 // Only a single kind of integer is ever sent over the wire, and
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31 // this is it.
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32 typedef unsigned long long protocol_int;
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33
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34 // Read an integer from the connection and verify that it has the
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35 // value V.
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36 status unmarshall_check (connection *, protocol_int v);
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37
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38 // Write an integer, prefixed with the integer type marker, to the
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39 // connection.
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40 status marshall_intlike (connection *, protocol_int);
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41
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42 // Read a type marker from the connection and verify that it is an
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43 // integer type marker. If not, return FAIL. If so, read an
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44 // integer store it in the out argument.
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45 status unmarshall_intlike (connection *, protocol_int *);
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46
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47 status marshall_array_start (connection *, char, size_t);
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48 status marshall_array_elmts (connection *, size_t, void *);
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49
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50 status unmarshall_array_start (connection *, char, size_t *);
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51 status unmarshall_array_elmts (connection *, size_t, void *);
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52
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53 // A template function that can handle marshalling various integer
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54 // objects to the connection.
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55 template<typename T>
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56 status marshall (connection *conn, T scalar)
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57 {
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58 return marshall_intlike (conn, scalar);
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59 }
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60
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61 // A template function that can handle unmarshalling various integer
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62 // objects from the connection. Note that this can't be
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63 // instantiated for enum types. Note also that there's no way at
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64 // the protocol level to distinguish different int types.
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65 template<typename T>
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66 status unmarshall (connection *conn, T *scalar)
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67 {
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68 protocol_int result;
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69
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70 if (!unmarshall_intlike (conn, &result))
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71 return FAIL;
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72 *scalar = result;
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73 return OK;
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74 }
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75
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76 // Send a string type marker followed by a string.
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77 status marshall (connection *, const char *);
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78
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79 // Read a string type marker followed by a string. The caller is
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80 // responsible for freeing the resulting string using 'delete[]'.
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81 status unmarshall (connection *, char **);
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82
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83 // Send a gcc_type_array marker followed by the array.
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84 status marshall (connection *, const gcc_type_array *);
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85
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86 // Read a gcc_type_array marker, followed by a gcc_type_array. The
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87 // resulting array must be freed by the caller, using 'delete[]' on
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88 // the elements, and 'delete' on the array object itself.
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89 status unmarshall (connection *, struct gcc_type_array **);
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90 };
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91
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92 #endif // CC1_PLUGIN_MARSHALL_HH
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