1 /*
2 * Copyright (C) 2015 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
match_test_bit(const char * fn,struct expression * expr,void * data)23 static void match_test_bit(const char *fn, struct expression *expr, void *data)
24 {
25 struct expression *arg;
26 char *macro;
27
28 arg = get_argument_from_call_expr(expr->args, 0);
29 arg = strip_expr(arg);
30
31 if (!arg || arg->type != EXPR_BINOP)
32 return;
33 if (arg->op != '|' && arg->op != SPECIAL_LEFTSHIFT)
34 return;
35 macro = get_macro_name(arg->pos);
36 if (macro && strstr(macro, "cpu_has"))
37 return;
38 sm_warning("test_bit() takes a bit number");
39 }
40
check_test_bit(int id)41 void check_test_bit(int id)
42 {
43 my_id = id;
44
45 if (option_project != PROJ_KERNEL)
46 return;
47
48 add_function_hook("test_bit", &match_test_bit, NULL);
49 add_function_hook("variable_test_bit", &match_test_bit, NULL);
50 add_function_hook("set_bit", &match_test_bit, NULL);
51 add_function_hook("clear_bit", &match_test_bit, NULL);
52 add_function_hook("test_and_clear_bit", &match_test_bit, NULL);
53 add_function_hook("test_and_set_bit", &match_test_bit, NULL);
54 }
55