1 /* 2 * Copyright (c) 2009, 2016, 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 package jdk.vm.ci.code.site; 24 25 import java.util.Objects; 26 27 /** 28 * Associates arbitrary information with a position in machine code. For example, HotSpot specific 29 * code in a compiler backend may use this to denote the position of a safepoint, exception handler 30 * entry point, verified entry point etc. 31 */ 32 public final class Mark extends Site { 33 34 /** 35 * An object denoting extra semantic information about the machine code position of this mark. 36 */ 37 public final Object id; 38 39 /** 40 * Creates a mark that associates {@code id} with the machine code position {@code pcOffset}. 41 * 42 * @param pcOffset 43 * @param id 44 */ 45 public Mark(int pcOffset, Object id) { 46 super(pcOffset); 47 this.id = id; 48 } 49 50 @Override 51 public String toString() { 52 if (id == null) { 53 return String.format("%d[<mark>]", pcOffset); 54 } else if (id instanceof Integer) { 55 return String.format("%d[<mark with id %s>]", pcOffset, Integer.toHexString((Integer) id)); 56 } else { 57 return String.format("%d[<mark with id %s>]", pcOffset, id.toString()); 58 } 59 } 60 61 @Override 62 public boolean equals(Object obj) { 63 if (this == obj) { 64 return true; 65 } 66 if (obj instanceof Mark) { 67 Mark that = (Mark) obj; 68 if (this.pcOffset == that.pcOffset && Objects.equals(this.id, that.id)) { 69 return true; 70 } 71 } 72 return false; 73 } 74 }