1/* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. Oracle designates this 7 * particular file as subject to the "Classpath" exception as provided 8 * by Oracle in the LICENSE file that accompanied this code. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 */ 24 25/* 26 * This file is available under and governed by the GNU General Public 27 * License version 2 only, as published by the Free Software Foundation. 28 * However, the following notice accompanied the original version of this 29 * file: 30 * 31 * ASM: a very small and fast Java bytecode manipulation framework 32 * Copyright (c) 2000-2011 INRIA, France Telecom 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. Neither the name of the copyright holders nor the names of its 44 * contributors may be used to endorse or promote products derived from 45 * this software without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 57 * THE POSSIBILITY OF SUCH DAMAGE. 58 */ 59package jdk.internal.org.objectweb.asm; 60 61/** 62 * Information about an exception handler block. 63 * 64 * @author Eric Bruneton 65 */ 66class Handler { 67 68 /** 69 * Beginning of the exception handler's scope (inclusive). 70 */ 71 Label start; 72 73 /** 74 * End of the exception handler's scope (exclusive). 75 */ 76 Label end; 77 78 /** 79 * Beginning of the exception handler's code. 80 */ 81 Label handler; 82 83 /** 84 * Internal name of the type of exceptions handled by this handler, or 85 * <tt>null</tt> to catch any exceptions. 86 */ 87 String desc; 88 89 /** 90 * Constant pool index of the internal name of the type of exceptions 91 * handled by this handler, or 0 to catch any exceptions. 92 */ 93 int type; 94 95 /** 96 * Next exception handler block info. 97 */ 98 Handler next; 99 100 /** 101 * Removes the range between start and end from the given exception 102 * handlers. 103 * 104 * @param h 105 * an exception handler list. 106 * @param start 107 * the start of the range to be removed. 108 * @param end 109 * the end of the range to be removed. Maybe null. 110 * @return the exception handler list with the start-end range removed. 111 */ 112 static Handler remove(Handler h, Label start, Label end) { 113 if (h == null) { 114 return null; 115 } else { 116 h.next = remove(h.next, start, end); 117 } 118 int hstart = h.start.position; 119 int hend = h.end.position; 120 int s = start.position; 121 int e = end == null ? Integer.MAX_VALUE : end.position; 122 // if [hstart,hend[ and [s,e[ intervals intersect... 123 if (s < hend && e > hstart) { 124 if (s <= hstart) { 125 if (e >= hend) { 126 // [hstart,hend[ fully included in [s,e[, h removed 127 h = h.next; 128 } else { 129 // [hstart,hend[ minus [s,e[ = [e,hend[ 130 h.start = end; 131 } 132 } else if (e >= hend) { 133 // [hstart,hend[ minus [s,e[ = [hstart,s[ 134 h.end = start; 135 } else { 136 // [hstart,hend[ minus [s,e[ = [hstart,s[ + [e,hend[ 137 Handler g = new Handler(); 138 g.start = end; 139 g.end = h.end; 140 g.handler = h.handler; 141 g.desc = h.desc; 142 g.type = h.type; 143 g.next = h.next; 144 h.end = start; 145 h.next = g; 146 } 147 } 148 return h; 149 } 150} 151