1*1f5207b7SJohn Levon /*
2*1f5207b7SJohn Levon * Copyright (C) 2011 Dan Carpenter.
3*1f5207b7SJohn Levon *
4*1f5207b7SJohn Levon * This program is free software; you can redistribute it and/or
5*1f5207b7SJohn Levon * modify it under the terms of the GNU General Public License
6*1f5207b7SJohn Levon * as published by the Free Software Foundation; either version 2
7*1f5207b7SJohn Levon * of the License, or (at your option) any later version.
8*1f5207b7SJohn Levon *
9*1f5207b7SJohn Levon * This program is distributed in the hope that it will be useful,
10*1f5207b7SJohn Levon * but WITHOUT ANY WARRANTY; without even the implied warranty of
11*1f5207b7SJohn Levon * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12*1f5207b7SJohn Levon * GNU General Public License for more details.
13*1f5207b7SJohn Levon *
14*1f5207b7SJohn Levon * You should have received a copy of the GNU General Public License
15*1f5207b7SJohn Levon * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16*1f5207b7SJohn Levon */
17*1f5207b7SJohn Levon
18*1f5207b7SJohn Levon #include "smatch.h"
19*1f5207b7SJohn Levon
20*1f5207b7SJohn Levon static int my_id;
21*1f5207b7SJohn Levon
match_assign(struct expression * expr)22*1f5207b7SJohn Levon static void match_assign(struct expression *expr)
23*1f5207b7SJohn Levon {
24*1f5207b7SJohn Levon const char *macro;
25*1f5207b7SJohn Levon sval_t max_left, max_right;
26*1f5207b7SJohn Levon char *name;
27*1f5207b7SJohn Levon
28*1f5207b7SJohn Levon if (expr->op != '=')
29*1f5207b7SJohn Levon return;
30*1f5207b7SJohn Levon
31*1f5207b7SJohn Levon macro = get_macro_name(expr->pos);
32*1f5207b7SJohn Levon if (!macro)
33*1f5207b7SJohn Levon return;
34*1f5207b7SJohn Levon if (strcmp(macro, "min_t"))
35*1f5207b7SJohn Levon return;
36*1f5207b7SJohn Levon
37*1f5207b7SJohn Levon if (!get_absolute_max(expr->left, &max_left))
38*1f5207b7SJohn Levon return;
39*1f5207b7SJohn Levon if (!get_absolute_max(expr->right, &max_right))
40*1f5207b7SJohn Levon return;
41*1f5207b7SJohn Levon
42*1f5207b7SJohn Levon if (sval_cmp(max_left, max_right) >= 0)
43*1f5207b7SJohn Levon return;
44*1f5207b7SJohn Levon
45*1f5207b7SJohn Levon name = expr_to_str(expr->right);
46*1f5207b7SJohn Levon sm_warning("min_t truncates here '%s' (%s vs %s)", name, sval_to_str(max_left), sval_to_str(max_right));
47*1f5207b7SJohn Levon free_string(name);
48*1f5207b7SJohn Levon }
49*1f5207b7SJohn Levon
check_min_t(int id)50*1f5207b7SJohn Levon void check_min_t(int id)
51*1f5207b7SJohn Levon {
52*1f5207b7SJohn Levon my_id = id;
53*1f5207b7SJohn Levon if (option_project != PROJ_KERNEL)
54*1f5207b7SJohn Levon return;
55*1f5207b7SJohn Levon add_hook(&match_assign, ASSIGNMENT_HOOK);
56*1f5207b7SJohn Levon }
57