check_param_mapper.c

   1 /*
   2  * Copyright (C) 2009 Dan Carpenter.
   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 /*
  19  * The idea behind this test is that if we have:
  20  * void foo(int bar)
  21  * {
  22  *         baz(1, bar);
  23  * }
  24  *
  25  * Passing "bar" to foo() really means passing "bar" to baz();
  26  *
  27  * In this case it would print:
  28  * info: param_mapper 0 => bar 1
  29  *
  30  */
  31
  32 #include "smatch.h"
  33
  34 static int my_id;
  35
  36 static void match_call(struct expression *expr)
  37 {
  38         struct expression *tmp;
  39         char *func;
  40         int arg_num;
  41         int i;
  42
  43         if (expr->fn->type != EXPR_SYMBOL)
  44                 return;
  45
  46         func = expr->fn->symbol_name->name;
  47
  48         i = -1;
  49         FOR_EACH_PTR(expr->args, tmp) {
  50                 i++;
  51                 tmp = strip_expr(tmp);
  52                 if (tmp->type != EXPR_SYMBOL)
  53                         continue;
  54                 if (param_was_set(tmp))
  55                         continue;
  56                 arg_num = get_param_num_from_sym(tmp->symbol);
  57                 if (arg_num < 0)
  58                         continue;
  59                 sm_msg("info: param_mapper %d => %s %d", arg_num, func, i);
  60         } END_FOR_EACH_PTR(tmp);
  61 }
  62
  63 void check_param_mapper(int id)
  64 {
  65         if (!option_info)
  66                 return;
  67         my_id = id;
  68         add_hook(&match_call, FUNCTION_CALL_HOOK);
  69 }