atomic_inc_dec: add this to check_list.h
[smatch.git] / check_return_cast.c
blobd0237e45840249c02809e42dafca8a42e813794f
1 /*
2 * Copyright (C) 2012 Oracle.
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.
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.
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
19 * Complains about places that return -1 instead of -ENOMEM
22 #include "smatch.h"
24 static int my_id;
26 static void match_return(struct expression *ret_value)
28 struct symbol *func_type = get_real_base_type(cur_func_sym);
29 sval_t sval;
31 if (!func_type || func_type->type != SYM_FN)
32 return;
33 func_type = get_real_base_type(func_type);
34 if (!func_type)
35 return;
36 if (!type_unsigned(func_type))
37 return;
38 if (type_bits(func_type) > 16)
39 return;
40 if (!get_fuzzy_min(ret_value, &sval))
41 return;
42 if (sval_is_positive(sval) || sval_cmp_val(sval, -1) == 0)
43 return;
45 sm_warning("signedness bug returning '%s'", sval_to_str(sval));
48 void check_return_cast(int id)
50 my_id = id;
51 add_hook(&match_return, RETURN_HOOK);