constraints: add constraints framework
[smatch.git] / check_logical_instead_of_bitwise.c
blob3c35f6b0d235f242b6b5ce386e23d70603d9b1c5
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
18 #include "smatch.h"
20 static int my_id;
22 static int is_bitshift(struct expression *expr)
24 expr = strip_expr(expr);
26 if (expr->type != EXPR_BINOP)
27 return 0;
28 if (expr->op == SPECIAL_LEFTSHIFT)
29 return 1;
30 return 0;
33 static void match_logic(struct expression *expr)
35 sval_t sval;
37 if (expr->type != EXPR_LOGICAL)
38 return;
40 if (get_macro_name(expr->pos))
41 return;
43 if (!get_value(expr->right, &sval)) {
44 if (!get_value(expr->left, &sval))
45 return;
48 if (sval.value == 0 || sval.value == 1)
49 return;
51 sm_msg("warn: should this be a bitwise op?");
54 static void match_assign(struct expression *expr)
56 struct expression *right;
58 right = strip_expr(expr->right);
59 if (right->type != EXPR_LOGICAL)
60 return;
61 if (is_bitshift(right->left) || is_bitshift(right->right))
62 sm_msg("warn: should this be a bitwise op?");
65 void check_logical_instead_of_bitwise(int id)
67 my_id = id;
69 add_hook(&match_logic, LOGIC_HOOK);
70 add_hook(&match_assign, ASSIGNMENT_HOOK);