1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.gc.z; 26 27 import sun.jvm.hotspot.debugger.Address; 28 29 class ZForwardingTableEntry { 30 private Address entry; 31 32 ZForwardingTableEntry(Address addr) { 33 entry = addr; 34 } 35 36 private static long empty() { 37 return ~0L; 38 } 39 40 boolean is_empty() { 41 return entry.asLongValue() == empty(); 42 } 43 44 Address to_offset() { 45 return entry.andWithMask((1L << 42) - 1); 46 } 47 48 long from_index() { 49 return entry.asLongValue() >>> 42; 50 } 51 52 public String toString() { 53 return entry + " - from_index: " + from_index() + " to_offset: " + to_offset(); 54 } 55 }