check_struct_type.c

   1 /*
   2  * Copyright (C) 2013 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
  20 static int my_id;
  21
  22 static void match_assign(const char *fn, struct expression *expr, void *_size_arg)
  23 {
  24         int size_arg = PTR_INT(_size_arg);
  25         struct expression *left;
  26         struct expression *call;
  27         struct expression *arg;
  28         struct symbol *left_type;
  29         struct symbol *size_type;
  30
  31         left = strip_expr(expr->left);
  32         left_type = get_type(left);
  33         if (!left_type || left_type->type != SYM_PTR)
  34                 return;
  35         left_type = get_real_base_type(left_type);
  36         if (!left_type || left_type->type != SYM_STRUCT)
  37                 return;
  38
  39         call = strip_expr(expr->right);
  40         arg = get_argument_from_call_expr(call->args, size_arg);
  41         if (!arg || arg->type != EXPR_SIZEOF || !arg->cast_type)
  42                 return;
  43         size_type = arg->cast_type;
  44         if (size_type->type != SYM_NODE)
  45                 return;
  46         size_type = get_real_base_type(size_type);
  47         if (size_type->type != SYM_STRUCT)
  48                 return;
  49         if (strcmp(left_type->ident->name, size_type->ident->name) == 0)
  50                 return;
  51         sm_msg("warn: struct type mismatch '%s vs %s'", left_type->ident->name,
  52                size_type->ident->name);
  53
  54 }
  55
  56 void check_struct_type(int id)
  57 {
  58         my_id = id;
  59
  60         if (option_project == PROJ_KERNEL) {
  61                 add_function_assign_hook("kmalloc", &match_assign, INT_PTR(0));
  62                 add_function_assign_hook("kzalloc", &match_assign, INT_PTR(0));
  63         }
  64 }