1 /* 2 * Copyright (C) 2017 Oracle. All rights reserved. 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 * This basically stores when a pointer is stored as a struct member. 20 * 21 */ 22 23 #include "smatch.h" 24 #include "smatch_slist.h" 25 #include "smatch_extra.h" 26 27 static int my_id; 28 29 static void match_assign(struct expression *expr) 30 { 31 struct expression *left, *right; 32 mtag_t left_tag; 33 int offset; 34 sval_t sval; 35 36 if (expr->op != '=') 37 return; 38 39 left = strip_expr(expr->left); 40 right = strip_expr(expr->right); 41 42 if (!type_is_ptr(get_type(right))) 43 return; 44 if (!get_implied_value(right, &sval)) 45 return; 46 if (sval_cmp(sval, valid_ptr_min_sval) < 0 || 47 sval_cmp(sval, valid_ptr_max_sval) > 0) 48 return; 49 if (sval.uvalue & MTAG_OFFSET_MASK) 50 return; 51 52 if (!expr_to_mtag_offset(left, &left_tag, &offset)) 53 return; 54 55 sql_insert_mtag_map(sval.uvalue, -offset, left_tag); 56 } 57 58 void register_mtag_map(int id) 59 { 60 my_id = id; 61 62 add_hook(&match_assign, ASSIGNMENT_HOOK); 63 add_hook(&match_assign, GLOBAL_ASSIGNMENT_HOOK); 64 } 65