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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2008, 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package com.sun.tools.example.debug.tty; | |
| 27 | + | |
| 28 | +import com.sun.jdi.*; | |
| 29 | +import com.sun.jdi.request.EventRequest; | |
| 30 | +import com.sun.jdi.request.ExceptionRequest; | |
| 31 | +import com.sun.jdi.request.ClassPrepareRequest; | |
| 32 | +import com.sun.jdi.event.ClassPrepareEvent; | |
| 33 | +import java.util.ArrayList; | |
| 34 | + | |
| 35 | +abstract class EventRequestSpec { | |
| 36 | + | |
| 37 | + final ReferenceTypeSpec refSpec; | |
| 38 | + | |
| 39 | + int suspendPolicy = EventRequest.SUSPEND_ALL; | |
| 40 | + | |
| 41 | + EventRequest resolved = null; | |
| 42 | + ClassPrepareRequest prepareRequest = null; | |
| 43 | + | |
| 44 | + EventRequestSpec(ReferenceTypeSpec refSpec) { | |
| 45 | + this.refSpec = refSpec; | |
| 46 | + } | |
| 47 | + | |
| 48 | + /** | |
| 49 | + * The 'refType' is known to match, return the EventRequest. | |
| 50 | + */ | |
| 51 | + abstract EventRequest resolveEventRequest(ReferenceType refType) | |
| 52 | + throws Exception; | |
| 53 | + | |
| 54 | + /** | |
| 55 | + * @return If this EventRequestSpec matches the 'refType' | |
| 56 | + * return the cooresponding EventRequest. Otherwise | |
| 57 | + * return null. | |
| 58 | + */ | |
| 59 | + synchronized EventRequest resolve(ClassPrepareEvent event) throws Exception { | |
| 60 | + if ((resolved == null) && | |
| 61 | + (prepareRequest != null) && | |
| 62 | + prepareRequest.equals(event.request())) { | |
| 63 | + | |
| 64 | + resolved = resolveEventRequest(event.referenceType()); | |
| 65 | + prepareRequest.disable(); | |
| 66 | + Env.vm().eventRequestManager().deleteEventRequest(prepareRequest); | |
| 67 | + prepareRequest = null; | |
| 68 | + | |
| 69 | + if (refSpec instanceof PatternReferenceTypeSpec) { | |
| 70 | + PatternReferenceTypeSpec prs = (PatternReferenceTypeSpec)refSpec; | |
| 71 | + if (! prs.isUnique()){ | |
| 72 | + /* | |
| 73 | + * Class pattern event requests are never | |
| 74 | + * considered "resolved", since future class loads | |
| 75 | + * might also match. | |
| 76 | + * Create and enable a new ClassPrepareRequest to | |
| 77 | + * keep trying to resolve. | |
| 78 | + */ | |
| 79 | + resolved = null; | |
| 80 | + prepareRequest = refSpec.createPrepareRequest(); | |
| 81 | + prepareRequest.enable(); | |
| 82 | + } | |
| 83 | + } | |
| 84 | + } | |
| 85 | + return resolved; | |
| 86 | + } | |
| 87 | + | |
| 88 | + synchronized void remove() { | |
| 89 | + if (isResolved()) { | |
| 90 | + Env.vm().eventRequestManager().deleteEventRequest(resolved()); | |
| 91 | + } | |
| 92 | + if (refSpec instanceof PatternReferenceTypeSpec) { | |
| 93 | + PatternReferenceTypeSpec prs = (PatternReferenceTypeSpec)refSpec; | |
| 94 | + if (! prs.isUnique()){ | |
| 95 | + /* | |
| 96 | + * This is a class pattern. Track down and delete | |
| 97 | + * all EventRequests matching this spec. | |
| 98 | + * Note: Class patterns apply only to ExceptionRequests, | |
| 99 | + * so that is all we need to examine. | |
| 100 | + */ | |
| 101 | + ArrayList<ExceptionRequest> deleteList = new ArrayList<ExceptionRequest>(); | |
| 102 | + for (ExceptionRequest er : | |
| 103 | + Env.vm().eventRequestManager().exceptionRequests()) { | |
| 104 | + if (prs.matches(er.exception())) { | |
| 105 | + deleteList.add (er); | |
| 106 | + } | |
| 107 | + } | |
| 108 | + Env.vm().eventRequestManager().deleteEventRequests(deleteList); | |
| 109 | + } | |
| 110 | + } | |
| 111 | + } | |
| 112 | + | |
| 113 | + private EventRequest resolveAgainstPreparedClasses() throws Exception { | |
| 114 | + for (ReferenceType refType : Env.vm().allClasses()) { | |
| 115 | + if (refType.isPrepared() && refSpec.matches(refType)) { | |
| 116 | + resolved = resolveEventRequest(refType); | |
| 117 | + } | |
| 118 | + } | |
| 119 | + return resolved; | |
| 120 | + } | |
| 121 | + | |
| 122 | + synchronized EventRequest resolveEagerly() throws Exception { | |
| 123 | + try { | |
| 124 | + if (resolved == null) { | |
| 125 | + /* | |
| 126 | + * Not resolved. Schedule a prepare request so we | |
| 127 | + * can resolve later. | |
| 128 | + */ | |
| 129 | + prepareRequest = refSpec.createPrepareRequest(); | |
| 130 | + prepareRequest.enable(); | |
| 131 | + | |
| 132 | + // Try to resolve in case the class is already loaded. | |
| 133 | + resolveAgainstPreparedClasses(); | |
| 134 | + if (resolved != null) { | |
| 135 | + prepareRequest.disable(); | |
| 136 | + Env.vm().eventRequestManager().deleteEventRequest(prepareRequest); | |
| 137 | + prepareRequest = null; | |
| 138 | + } | |
| 139 | + } | |
| 140 | + if (refSpec instanceof PatternReferenceTypeSpec) { | |
| 141 | + PatternReferenceTypeSpec prs = (PatternReferenceTypeSpec)refSpec; | |
| 142 | + if (! prs.isUnique()){ | |
| 143 | + /* | |
| 144 | + * Class pattern event requests are never | |
| 145 | + * considered "resolved", since future class loads | |
| 146 | + * might also match. Create a new | |
| 147 | + * ClassPrepareRequest if necessary and keep | |
| 148 | + * trying to resolve. | |
| 149 | + */ | |
| 150 | + resolved = null; | |
| 151 | + if (prepareRequest == null) { | |
| 152 | + prepareRequest = refSpec.createPrepareRequest(); | |
| 153 | + prepareRequest.enable(); | |
| 154 | + } | |
| 155 | + } | |
| 156 | + } | |
| 157 | + } catch (VMNotConnectedException e) { | |
| 158 | + // Do nothing. Another resolve will be attempted when the | |
| 159 | + // VM is started. | |
| 160 | + } | |
| 161 | + return resolved; | |
| 162 | + } | |
| 163 | + | |
| 164 | + /** | |
| 165 | + * @return the eventRequest this spec has been resolved to, | |
| 166 | + * null if so far unresolved. | |
| 167 | + */ | |
| 168 | + EventRequest resolved() { | |
| 169 | + return resolved; | |
| 170 | + } | |
| 171 | + | |
| 172 | + /** | |
| 173 | + * @return true if this spec has been resolved. | |
| 174 | + */ | |
| 175 | + boolean isResolved() { | |
| 176 | + return resolved != null; | |
| 177 | + } | |
| 178 | + | |
| 179 | + protected boolean isJavaIdentifier(String s) { | |
| 180 | + if (s.length() == 0) { | |
| 181 | + return false; | |
| 182 | + } | |
| 183 | + | |
| 184 | + int cp = s.codePointAt(0); | |
| 185 | + if (! Character.isJavaIdentifierStart(cp)) { | |
| 186 | + return false; | |
| 187 | + } | |
| 188 | + | |
| 189 | + for (int i = Character.charCount(cp); i < s.length(); i += Character.charCount(cp)) { | |
| 190 | + cp = s.codePointAt(i); | |
| 191 | + if (! Character.isJavaIdentifierPart(cp)) { | |
| 192 | + return false; | |
| 193 | + } | |
| 194 | + } | |
| 195 | + | |
| 196 | + return true; | |
| 197 | + } | |
| 198 | + | |
| 199 | + String errorMessageFor(Exception e) { | |
| 200 | + if (e instanceof IllegalArgumentException) { | |
| 201 | + return (MessageOutput.format("Invalid command syntax")); | |
| 202 | + } else if (e instanceof RuntimeException) { | |
| 203 | + // A runtime exception that we were not expecting | |
| 204 | + throw (RuntimeException)e; | |
| 205 | + } else { | |
| 206 | + return (MessageOutput.format("Internal error; unable to set", | |
| 207 | + this.refSpec.toString())); | |
| 208 | + } | |
| 209 | + } | |
| 210 | +} | |