smatch_auto_copy.c

   1 /*
   2  * Copyright (C) 2014 Oracle.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17
  18 #include "smatch.h"
  19 #include "smatch_slist.h"
  20
  21 static int my_id;
  22
  23 static int *auto_copy;
  24
  25 void set_auto_copy(int owner)
  26 {
  27         if (owner <= 1 || owner > num_checks) {
  28                 printf("bogus set_auto_copy()\n");
  29                 return;
  30         }
  31         auto_copy[owner] = 1;
  32 }
  33
  34 static void match_assign(struct expression *expr)
  35 {
  36         char *left_name = NULL;
  37         char *right_name = NULL;
  38         struct symbol *left_sym, *right_sym;
  39         struct state_list *slist = NULL;
  40         struct sm_state *sm;
  41
  42         left_name = expr_to_var_sym(expr->left, &left_sym);
  43         if (!left_name || !left_sym)
  44                 goto free;
  45         right_name = expr_to_var_sym(expr->right, &right_sym);
  46         if (!right_name || !right_sym)
  47                 goto free;
  48
  49         FOR_EACH_SM(__get_cur_stree(), sm) {
  50                 if (sm->owner <= 1 || sm->owner > num_checks)
  51                         continue;
  52                 if (!auto_copy[sm->owner])
  53                         continue;
  54                 if (right_sym != sm->sym)
  55                         continue;
  56                 if (strcmp(right_name, sm->name) != 0)
  57                         continue;
  58                 add_ptr_list(&slist, sm);
  59         } END_FOR_EACH_SM(sm);
  60
  61
  62         FOR_EACH_PTR(slist, sm) {
  63                 set_state(sm->owner, left_name, left_sym, sm->state);
  64         } END_FOR_EACH_PTR(sm);
  65
  66 free:
  67         free_slist(&slist);
  68         free_string(left_name);
  69         free_string(right_name);
  70 }
  71
  72 void register_auto_copy(int id)
  73 {
  74         my_id = id;
  75         auto_copy = malloc((num_checks + 1) * sizeof(*auto_copy));
  76         memset(auto_copy, 0, (num_checks + 1) * sizeof(*auto_copy));
  77
  78         add_hook(&match_assign, ASSIGNMENT_HOOK);
  79 }