1 /* 2 * Copyright (C) 2011 Dan Carpenter. 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 20 static int my_id; 21 22 static void match_assign(struct expression *expr) 23 { 24 const char *macro; 25 sval_t max_left, max_right; 26 char *name; 27 28 if (expr->op != '=') 29 return; 30 31 macro = get_macro_name(expr->pos); 32 if (!macro) 33 return; 34 if (strcmp(macro, "min_t")) 35 return; 36 37 if (!get_absolute_max(expr->left, &max_left)) 38 return; 39 if (!get_absolute_max(expr->right, &max_right)) 40 return; 41 42 if (sval_cmp(max_left, max_right) >= 0) 43 return; 44 45 name = expr_to_str(expr->right); 46 sm_warning("min_t truncates here '%s' (%s vs %s)", name, sval_to_str(max_left), sval_to_str(max_right)); 47 free_string(name); 48 } 49 50 void check_min_t(int id) 51 { 52 my_id = id; 53 if (option_project != PROJ_KERNEL) 54 return; 55 add_hook(&match_assign, ASSIGNMENT_HOOK); 56 } 57