libcc1/marshall.cc

   1 /* Marshalling and unmarshalling.
   2    Copyright (C) 2014-2022 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include <cc1plugin-config.h>
  21 #include <new>
  22 #include <string.h>
  23 #include "marshall.hh"
  24 #include "connection.hh"
  25 #include "rpc.hh"
  26
  27 cc1_plugin::status
  28 cc1_plugin::unmarshall_check (connection *conn, unsigned long long check)
  29 {
  30   unsigned long long r;
  31
  32   if (!unmarshall (conn, &r))
  33     return FAIL;
  34   return check == r ? OK : FAIL;
  35 }
  36
  37 cc1_plugin::status
  38 cc1_plugin::marshall_intlike (connection *conn, unsigned long long val)
  39 {
  40   if (!conn->send ('i'))
  41     return FAIL;
  42   return conn->send (&val, sizeof (val));
  43 }
  44
  45 cc1_plugin::status
  46 cc1_plugin::unmarshall_intlike (connection *conn, unsigned long long *result)
  47 {
  48   if (!conn->require ('i'))
  49     return FAIL;
  50   return conn->get (result, sizeof (*result));
  51 }
  52
  53 cc1_plugin::status
  54 cc1_plugin::marshall (connection *conn, const char *str)
  55 {
  56   if (!conn->send ('s'))
  57     return FAIL;
  58
  59   unsigned long long len = str == NULL ? -1ULL : strlen (str);
  60   if (!conn->send (&len, sizeof (len)))
  61     return FAIL;
  62
  63   if (str == NULL)
  64     return OK;
  65
  66   return conn->send (str, len);
  67 }
  68
  69 cc1_plugin::status
  70 cc1_plugin::unmarshall (connection *conn, char **result)
  71 {
  72   unsigned long long len;
  73
  74   if (!conn->require ('s'))
  75     return FAIL;
  76   if (!conn->get (&len, sizeof (len)))
  77     return FAIL;
  78
  79   if (len == -1ULL)
  80     {
  81       *result = NULL;
  82       return OK;
  83     }
  84
  85   char *str = new (std::nothrow) char[len + 1];
  86   if (str == NULL)
  87     return FAIL;
  88
  89   if (!conn->get (str, len))
  90     {
  91       delete[] str;
  92       return FAIL;
  93     }
  94
  95   str[len] = '\0';
  96   *result = str;
  97
  98   return OK;
  99 }
 100
 101 cc1_plugin::status
 102 cc1_plugin::marshall_array_start (connection *conn, char id,
 103                                   size_t n_elements)
 104 {
 105   if (!conn->send (id))
 106     return FAIL;
 107
 108   unsigned long long r = n_elements;
 109   if (!conn->send (&r, sizeof (r)))
 110     return FAIL;
 111
 112   return OK;
 113 }
 114
 115 cc1_plugin::status
 116 cc1_plugin::marshall_array_elmts (connection *conn, size_t n_bytes,
 117                                   void *elements)
 118 {
 119   return conn->send (elements, n_bytes);
 120 }
 121
 122 cc1_plugin::status
 123 cc1_plugin::unmarshall_array_start (connection *conn, char id,
 124                                     size_t *n_elements)
 125 {
 126   unsigned long long len;
 127
 128   if (!conn->require (id))
 129     return FAIL;
 130   if (!conn->get (&len, sizeof (len)))
 131     return FAIL;
 132
 133   *n_elements = len;
 134
 135   return OK;
 136 }
 137
 138 cc1_plugin::status
 139 cc1_plugin::unmarshall_array_elmts (connection *conn, size_t n_bytes,
 140                                     void *elements)
 141 {
 142   return conn->get (elements, n_bytes);
 143 }
 144
 145 cc1_plugin::status
 146 cc1_plugin::marshall (connection *conn, const gcc_type_array *a)
 147 {
 148   size_t len;
 149
 150   if (a)
 151     len = a->n_elements;
 152   else
 153     len = (size_t)-1;
 154
 155   if (!marshall_array_start (conn, 'a', len))
 156     return FAIL;
 157
 158   if (!a)
 159     return OK;
 160
 161   return marshall_array_elmts (conn, len * sizeof (a->elements[0]),
 162                                a->elements);
 163 }
 164
 165 cc1_plugin::status
 166 cc1_plugin::unmarshall (connection *conn, gcc_type_array **result)
 167 {
 168   size_t len;
 169
 170   if (!unmarshall_array_start (conn, 'a', &len))
 171     return FAIL;
 172
 173   if (len == (size_t)-1)
 174     {
 175       *result = NULL;
 176       return OK;
 177     }
 178
 179   cc1_plugin::unique_ptr<gcc_type_array> gta (new gcc_type_array {});
 180
 181   gta->n_elements = len;
 182   gta->elements = new gcc_type[len];
 183
 184   if (!unmarshall_array_elmts (conn,
 185                                len * sizeof (gta->elements[0]),
 186                                gta->elements))
 187     return FAIL;
 188
 189   *result = gta.release ();
 190
 191   return OK;
 192 }