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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.ThreadReference; | |
| 29 | +import com.sun.jdi.ThreadGroupReference; | |
| 30 | +import com.sun.jdi.IncompatibleThreadStateException; | |
| 31 | +import com.sun.jdi.StackFrame; | |
| 32 | +import java.util.List; | |
| 33 | +import java.util.ArrayList; | |
| 34 | +import java.util.Collections; | |
| 35 | + | |
| 36 | +class ThreadInfo { | |
| 37 | + // This is a list of all known ThreadInfo objects. It survives | |
| 38 | + // ThreadInfo.invalidateAll, unlike the other static fields below. | |
| 39 | + private static List<ThreadInfo> threads = Collections.synchronizedList(new ArrayList<ThreadInfo>()); | |
| 40 | + private static boolean gotInitialThreads = false; | |
| 41 | + | |
| 42 | + private static ThreadInfo current = null; | |
| 43 | + private static ThreadGroupReference group = null; | |
| 44 | + | |
| 45 | + private final ThreadReference thread; | |
| 46 | + private int currentFrameIndex = 0; | |
| 47 | + | |
| 48 | + private ThreadInfo(ThreadReference thread) { | |
| 49 | + this.thread = thread; | |
| 50 | + if (thread == null) { | |
| 51 | + MessageOutput.fatalError("Internal error: null ThreadInfo created"); | |
| 52 | + } | |
| 53 | + } | |
| 54 | + | |
| 55 | + private static void initThreads() { | |
| 56 | + if (!gotInitialThreads) { | |
| 57 | + for (ThreadReference thread : Env.vm().allThreads()) { | |
| 58 | + threads.add(new ThreadInfo(thread)); | |
| 59 | + } | |
| 60 | + gotInitialThreads = true; | |
| 61 | + } | |
| 62 | + } | |
| 63 | + | |
| 64 | + static void addThread(ThreadReference thread) { | |
| 65 | + synchronized (threads) { | |
| 66 | + initThreads(); | |
| 67 | + ThreadInfo ti = new ThreadInfo(thread); | |
| 68 | + // Guard against duplicates. Duplicates can happen during | |
| 69 | + // initialization when a particular thread might be added both | |
| 70 | + // by a thread start event and by the initial call to threads() | |
| 71 | + if (getThreadInfo(thread) == null) { | |
| 72 | + threads.add(ti); | |
| 73 | + } | |
| 74 | + } | |
| 75 | + } | |
| 76 | + | |
| 77 | + static void removeThread(ThreadReference thread) { | |
| 78 | + if (thread.equals(ThreadInfo.current)) { | |
| 79 | + // Current thread has died. | |
| 80 | + | |
| 81 | + // Be careful getting the thread name. If its death happens | |
| 82 | + // as part of VM termination, it may be too late to get the | |
| 83 | + // information, and an exception will be thrown. | |
| 84 | + String currentThreadName; | |
| 85 | + try { | |
| 86 | + currentThreadName = "\"" + thread.name() + "\""; | |
| 87 | + } catch (Exception e) { | |
| 88 | + currentThreadName = ""; | |
| 89 | + } | |
| 90 | + | |
| 91 | + setCurrentThread(null); | |
| 92 | + | |
| 93 | + MessageOutput.println(); | |
| 94 | + MessageOutput.println("Current thread died. Execution continuing...", | |
| 95 | + currentThreadName); | |
| 96 | + } | |
| 97 | + threads.remove(getThreadInfo(thread)); | |
| 98 | + } | |
| 99 | + | |
| 100 | + static List<ThreadInfo> threads() { | |
| 101 | + synchronized(threads) { | |
| 102 | + initThreads(); | |
| 103 | + // Make a copy to allow iteration without synchronization | |
| 104 | + return new ArrayList<ThreadInfo>(threads); | |
| 105 | + } | |
| 106 | + } | |
| 107 | + | |
| 108 | + static void invalidateAll() { | |
| 109 | + current = null; | |
| 110 | + group = null; | |
| 111 | + synchronized (threads) { | |
| 112 | + for (ThreadInfo ti : threads()) { | |
| 113 | + ti.invalidate(); | |
| 114 | + } | |
| 115 | + } | |
| 116 | + } | |
| 117 | + | |
| 118 | + static void setThreadGroup(ThreadGroupReference tg) { | |
| 119 | + group = tg; | |
| 120 | + } | |
| 121 | + | |
| 122 | + static void setCurrentThread(ThreadReference tr) { | |
| 123 | + if (tr == null) { | |
| 124 | + setCurrentThreadInfo(null); | |
| 125 | + } else { | |
| 126 | + ThreadInfo tinfo = getThreadInfo(tr); | |
| 127 | + setCurrentThreadInfo(tinfo); | |
| 128 | + } | |
| 129 | + } | |
| 130 | + | |
| 131 | + static void setCurrentThreadInfo(ThreadInfo tinfo) { | |
| 132 | + current = tinfo; | |
| 133 | + if (current != null) { | |
| 134 | + current.invalidate(); | |
| 135 | + } | |
| 136 | + } | |
| 137 | + | |
| 138 | + /** | |
| 139 | + * Get the current ThreadInfo object. | |
| 140 | + * | |
| 141 | + * @return the ThreadInfo for the current thread. | |
| 142 | + */ | |
| 143 | + static ThreadInfo getCurrentThreadInfo() { | |
| 144 | + return current; | |
| 145 | + } | |
| 146 | + | |
| 147 | + /** | |
| 148 | + * Get the thread from this ThreadInfo object. | |
| 149 | + * | |
| 150 | + * @return the Thread wrapped by this ThreadInfo. | |
| 151 | + */ | |
| 152 | + ThreadReference getThread() { | |
| 153 | + return thread; | |
| 154 | + } | |
| 155 | + | |
| 156 | + static ThreadGroupReference group() { | |
| 157 | + if (group == null) { | |
| 158 | + // Current thread group defaults to the first top level | |
| 159 | + // thread group. | |
| 160 | + setThreadGroup(Env.vm().topLevelThreadGroups().get(0)); | |
| 161 | + } | |
| 162 | + return group; | |
| 163 | + } | |
| 164 | + | |
| 165 | + static ThreadInfo getThreadInfo(long id) { | |
| 166 | + ThreadInfo retInfo = null; | |
| 167 | + | |
| 168 | + synchronized (threads) { | |
| 169 | + for (ThreadInfo ti : threads()) { | |
| 170 | + if (ti.thread.uniqueID() == id) { | |
| 171 | + retInfo = ti; | |
| 172 | + break; | |
| 173 | + } | |
| 174 | + } | |
| 175 | + } | |
| 176 | + return retInfo; | |
| 177 | + } | |
| 178 | + | |
| 179 | + static ThreadInfo getThreadInfo(ThreadReference tr) { | |
| 180 | + return getThreadInfo(tr.uniqueID()); | |
| 181 | + } | |
| 182 | + | |
| 183 | + static ThreadInfo getThreadInfo(String idToken) { | |
| 184 | + ThreadInfo tinfo = null; | |
| 185 | + if (idToken.startsWith("t@")) { | |
| 186 | + idToken = idToken.substring(2); | |
| 187 | + } | |
| 188 | + try { | |
| 189 | + long threadId = Long.decode(idToken).longValue(); | |
| 190 | + tinfo = getThreadInfo(threadId); | |
| 191 | + } catch (NumberFormatException e) { | |
| 192 | + tinfo = null; | |
| 193 | + } | |
| 194 | + return tinfo; | |
| 195 | + } | |
| 196 | + | |
| 197 | + /** | |
| 198 | + * Get the thread stack frames. | |
| 199 | + * | |
| 200 | + * @return a <code>List</code> of the stack frames. | |
| 201 | + */ | |
| 202 | + List<StackFrame> getStack() throws IncompatibleThreadStateException { | |
| 203 | + return thread.frames(); | |
| 204 | + } | |
| 205 | + | |
| 206 | + /** | |
| 207 | + * Get the current stackframe. | |
| 208 | + * | |
| 209 | + * @return the current stackframe. | |
| 210 | + */ | |
| 211 | + StackFrame getCurrentFrame() throws IncompatibleThreadStateException { | |
| 212 | + if (thread.frameCount() == 0) { | |
| 213 | + return null; | |
| 214 | + } | |
| 215 | + return thread.frame(currentFrameIndex); | |
| 216 | + } | |
| 217 | + | |
| 218 | + /** | |
| 219 | + * Invalidate the current stackframe index. | |
| 220 | + */ | |
| 221 | + void invalidate() { | |
| 222 | + currentFrameIndex = 0; | |
| 223 | + } | |
| 224 | + | |
| 225 | + /* Throw IncompatibleThreadStateException if not suspended */ | |
| 226 | + private void assureSuspended() throws IncompatibleThreadStateException { | |
| 227 | + if (!thread.isSuspended()) { | |
| 228 | + throw new IncompatibleThreadStateException(); | |
| 229 | + } | |
| 230 | + } | |
| 231 | + | |
| 232 | + /** | |
| 233 | + * Get the current stackframe index. | |
| 234 | + * | |
| 235 | + * @return the number of the current stackframe. Frame zero is the | |
| 236 | + * closest to the current program counter | |
| 237 | + */ | |
| 238 | + int getCurrentFrameIndex() { | |
| 239 | + return currentFrameIndex; | |
| 240 | + } | |
| 241 | + | |
| 242 | + /** | |
| 243 | + * Set the current stackframe to a specific frame. | |
| 244 | + * | |
| 245 | + * @param nFrame the number of the desired stackframe. Frame zero is the | |
| 246 | + * closest to the current program counter | |
| 247 | + * @exception IllegalAccessError when the thread isn't | |
| 248 | + * suspended or waiting at a breakpoint | |
| 249 | + * @exception ArrayIndexOutOfBoundsException when the | |
| 250 | + * requested frame is beyond the stack boundary | |
| 251 | + */ | |
| 252 | + void setCurrentFrameIndex(int nFrame) throws IncompatibleThreadStateException { | |
| 253 | + assureSuspended(); | |
| 254 | + if ((nFrame < 0) || (nFrame >= thread.frameCount())) { | |
| 255 | + throw new ArrayIndexOutOfBoundsException(); | |
| 256 | + } | |
| 257 | + currentFrameIndex = nFrame; | |
| 258 | + } | |
| 259 | + | |
| 260 | + /** | |
| 261 | + * Change the current stackframe to be one or more frames higher | |
| 262 | + * (as in, away from the current program counter). | |
| 263 | + * | |
| 264 | + * @param nFrames the number of stackframes | |
| 265 | + * @exception IllegalAccessError when the thread isn't | |
| 266 | + * suspended or waiting at a breakpoint | |
| 267 | + * @exception ArrayIndexOutOfBoundsException when the | |
| 268 | + * requested frame is beyond the stack boundary | |
| 269 | + */ | |
| 270 | + void up(int nFrames) throws IncompatibleThreadStateException { | |
| 271 | + setCurrentFrameIndex(currentFrameIndex + nFrames); | |
| 272 | + } | |
| 273 | + | |
| 274 | + /** | |
| 275 | + * Change the current stackframe to be one or more frames lower | |
| 276 | + * (as in, toward the current program counter). * | |
| 277 | + * @param nFrames the number of stackframes | |
| 278 | + * @exception IllegalAccessError when the thread isn't | |
| 279 | + * suspended or waiting at a breakpoint | |
| 280 | + * @exception ArrayIndexOutOfBoundsException when the | |
| 281 | + * requested frame is beyond the stack boundary | |
| 282 | + */ | |
| 283 | + void down(int nFrames) throws IncompatibleThreadStateException { | |
| 284 | + setCurrentFrameIndex(currentFrameIndex - nFrames); | |
| 285 | + } | |
| 286 | + | |
| 287 | +} | |