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 /* 19 * Complains about places that return -1 instead of -ENOMEM 20 */ 21 22 #include "smatch.h" 23 24 static int my_id; 25 match_return(struct expression * ret_value)26static void match_return(struct expression *ret_value) 27 { 28 struct symbol *func_type = get_real_base_type(cur_func_sym); 29 sval_t sval; 30 31 if (!func_type || func_type->type != SYM_FN) 32 return; 33 func_type = get_real_base_type(func_type); 34 if (!func_type) 35 return; 36 if (!type_unsigned(func_type)) 37 return; 38 if (type_bits(func_type) > 16) 39 return; 40 if (!get_fuzzy_min(ret_value, &sval)) 41 return; 42 if (sval_is_positive(sval) || sval_cmp_val(sval, -1) == 0) 43 return; 44 45 sm_warning("signedness bug returning '%s'", sval_to_str(sval)); 46 } 47 check_return_cast(int id)48void check_return_cast(int id) 49 { 50 my_id = id; 51 add_hook(&match_return, RETURN_HOOK); 52 } 53