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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 | } | ||