1/*
2 * Copyright (C) 2012 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
20static int my_id;
21
22static void check_constant(struct expression *expr)
23{
24	sval_t val;
25
26	if (!get_value(expr->right, &val))
27		return;
28	sm_warning("was '== %s' instead of '='", sval_to_str(val));
29}
30
31static void check_address(struct expression *expr)
32{
33	char *str;
34	struct expression *right = strip_expr(expr->right);
35
36	if (!__cur_stmt || __cur_stmt->type != STMT_IF)
37		return;
38
39	if (right->type != EXPR_PREOP ||
40	    right->op != '&')
41		return;
42
43	if (get_macro_name(expr->pos))
44		return;
45
46	str = expr_to_str(right);
47	sm_warning("was '== %s' instead of '='", str);
48	free_string(str);
49}
50
51static void match_condition(struct expression *expr)
52{
53	if (expr->type != EXPR_ASSIGNMENT || expr->op != '=')
54		return;
55
56	check_constant(expr);
57	check_address(expr);
58}
59
60void check_assign_vs_compare(int id)
61{
62	my_id = id;
63	add_hook(&match_condition, CONDITION_HOOK);
64}
65