check_return.c

   1 /*
   2  * Copyright (C) 2010 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 #include "smatch.h"
  19 #include "smatch_slist.h"
  20
  21 static int my_id;
  22
  23 static void must_check(const char *fn, struct expression *expr, void *data)
  24 {
  25         struct statement *stmt;
  26
  27         stmt = last_ptr_list((struct ptr_list *)big_statement_stack);
  28         if (stmt->type == STMT_EXPRESSION && stmt->expression == expr)
  29                 sm_msg("warn: unchecked '%s'", fn);
  30 }
  31
  32 static void register_must_check_funcs(void)
  33 {
  34         struct token *token;
  35         const char *func;
  36         static char name[256];
  37
  38
  39         snprintf(name, 256, "%s.must_check_funcs", option_project_str);
  40         name[255] = '\0';
  41         token = get_tokens_file(name);
  42         if (!token)
  43                 return;
  44         if (token_type(token) != TOKEN_STREAMBEGIN)
  45                 return;
  46         token = token->next;
  47         while (token_type(token) != TOKEN_STREAMEND) {
  48                 if (token_type(token) != TOKEN_IDENT)
  49                         return;
  50                 func = show_ident(token->ident);
  51                 add_function_hook(func, &must_check, NULL);
  52                 token = token->next;
  53         }
  54         clear_token_alloc();
  55 }
  56
  57 void check_return(int id)
  58 {
  59         my_id = id;
  60         register_must_check_funcs();
  61 }