1 /*** 2 * ASM: a very small and fast Java bytecode manipulation framework 3 * Copyright (c) 2000-2011 INRIA, France Telecom 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the copyright holders nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 package com.sleepycat.asm; 31 32 /** 33 * Information about an exception handler block. 34 * 35 * @author Eric Bruneton 36 */ 37 class Handler { 38 39 /** 40 * Beginning of the exception handler's scope (inclusive). 41 */ 42 Label start; 43 44 /** 45 * End of the exception handler's scope (exclusive). 46 */ 47 Label end; 48 49 /** 50 * Beginning of the exception handler's code. 51 */ 52 Label handler; 53 54 /** 55 * Internal name of the type of exceptions handled by this handler, or 56 * <tt>null</tt> to catch any exceptions. 57 */ 58 String desc; 59 60 /** 61 * Constant pool index of the internal name of the type of exceptions 62 * handled by this handler, or 0 to catch any exceptions. 63 */ 64 int type; 65 66 /** 67 * Next exception handler block info. 68 */ 69 Handler next; 70 71 /** 72 * Removes the range between start and end from the given exception 73 * handlers. 74 * 75 * @param h an exception handler list. 76 * @param start the start of the range to be removed. 77 * @param end the end of the range to be removed. Maybe null. 78 * @return the exception handler list with the start-end range removed. 79 */ remove(Handler h, Label start, Label end)80 static Handler remove(Handler h, Label start, Label end) { 81 if (h == null) { 82 return null; 83 } else { 84 h.next = remove(h.next, start, end); 85 } 86 int hstart = h.start.position; 87 int hend = h.end.position; 88 int s = start.position; 89 int e = end == null ? Integer.MAX_VALUE : end.position; 90 // if [hstart,hend[ and [s,e[ intervals intersect... 91 if (s < hend && e > hstart) { 92 if (s <= hstart) { 93 if (e >= hend) { 94 // [hstart,hend[ fully included in [s,e[, h removed 95 h = h.next; 96 } else { 97 // [hstart,hend[ minus [s,e[ = [e,hend[ 98 h.start = end; 99 } 100 } else if (e >= hend) { 101 // [hstart,hend[ minus [s,e[ = [hstart,s[ 102 h.end = start; 103 } else { 104 // [hstart,hend[ minus [s,e[ = [hstart,s[ + [e,hend[ 105 Handler g = new Handler(); 106 g.start = end; 107 g.end = h.end; 108 g.handler = h.handler; 109 g.desc = h.desc; 110 g.type = h.type; 111 g.next = h.next; 112 h.end = start; 113 h.next = g; 114 } 115 } 116 return h; 117 } 118 } 119