| /* |
| * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This source code is provided to illustrate the usage of a given feature |
| * or technique and has been deliberately simplified. Additional steps |
| * required for a production-quality application, such as security checks, |
| * input validation and proper error handling, might not be present in |
| * this sample code. |
| */ |
| |
| |
| package com.sun.tools.example.debug.tty; |
| |
| import com.sun.jdi.ThreadReference; |
| import com.sun.jdi.ThreadGroupReference; |
| import com.sun.jdi.IncompatibleThreadStateException; |
| import com.sun.jdi.StackFrame; |
| import java.util.List; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| |
| class ThreadInfo { |
| // This is a list of all known ThreadInfo objects. It survives |
| // ThreadInfo.invalidateAll, unlike the other static fields below. |
| private static List<ThreadInfo> threads = Collections.synchronizedList(new ArrayList<ThreadInfo>()); |
| private static boolean gotInitialThreads = false; |
| |
| private static ThreadInfo current = null; |
| private static ThreadGroupReference group = null; |
| |
| private final ThreadReference thread; |
| private int currentFrameIndex = 0; |
| |
| private ThreadInfo(ThreadReference thread) { |
| this.thread = thread; |
| if (thread == null) { |
| MessageOutput.fatalError("Internal error: null ThreadInfo created"); |
| } |
| } |
| |
| private static void initThreads() { |
| if (!gotInitialThreads) { |
| for (ThreadReference thread : Env.vm().allThreads()) { |
| threads.add(new ThreadInfo(thread)); |
| } |
| gotInitialThreads = true; |
| } |
| } |
| |
| static void addThread(ThreadReference thread) { |
| synchronized (threads) { |
| initThreads(); |
| ThreadInfo ti = new ThreadInfo(thread); |
| // Guard against duplicates. Duplicates can happen during |
| // initialization when a particular thread might be added both |
| // by a thread start event and by the initial call to threads() |
| if (getThreadInfo(thread) == null) { |
| threads.add(ti); |
| } |
| } |
| } |
| |
| static void removeThread(ThreadReference thread) { |
| if (thread.equals(ThreadInfo.current)) { |
| // Current thread has died. |
| |
| // Be careful getting the thread name. If its death happens |
| // as part of VM termination, it may be too late to get the |
| // information, and an exception will be thrown. |
| String currentThreadName; |
| try { |
| currentThreadName = "\"" + thread.name() + "\""; |
| } catch (Exception e) { |
| currentThreadName = ""; |
| } |
| |
| setCurrentThread(null); |
| |
| MessageOutput.println(); |
| MessageOutput.println("Current thread died. Execution continuing...", |
| currentThreadName); |
| } |
| threads.remove(getThreadInfo(thread)); |
| } |
| |
| static List<ThreadInfo> threads() { |
| synchronized(threads) { |
| initThreads(); |
| // Make a copy to allow iteration without synchronization |
| return new ArrayList<ThreadInfo>(threads); |
| } |
| } |
| |
| static void invalidateAll() { |
| current = null; |
| group = null; |
| synchronized (threads) { |
| for (ThreadInfo ti : threads()) { |
| ti.invalidate(); |
| } |
| } |
| } |
| |
| static void setThreadGroup(ThreadGroupReference tg) { |
| group = tg; |
| } |
| |
| static void setCurrentThread(ThreadReference tr) { |
| if (tr == null) { |
| setCurrentThreadInfo(null); |
| } else { |
| ThreadInfo tinfo = getThreadInfo(tr); |
| setCurrentThreadInfo(tinfo); |
| } |
| } |
| |
| static void setCurrentThreadInfo(ThreadInfo tinfo) { |
| current = tinfo; |
| if (current != null) { |
| current.invalidate(); |
| } |
| } |
| |
| /** |
| * Get the current ThreadInfo object. |
| * |
| * @return the ThreadInfo for the current thread. |
| */ |
| static ThreadInfo getCurrentThreadInfo() { |
| return current; |
| } |
| |
| /** |
| * Get the thread from this ThreadInfo object. |
| * |
| * @return the Thread wrapped by this ThreadInfo. |
| */ |
| ThreadReference getThread() { |
| return thread; |
| } |
| |
| static ThreadGroupReference group() { |
| if (group == null) { |
| // Current thread group defaults to the first top level |
| // thread group. |
| setThreadGroup(Env.vm().topLevelThreadGroups().get(0)); |
| } |
| return group; |
| } |
| |
| static ThreadInfo getThreadInfo(long id) { |
| ThreadInfo retInfo = null; |
| |
| synchronized (threads) { |
| for (ThreadInfo ti : threads()) { |
| if (ti.thread.uniqueID() == id) { |
| retInfo = ti; |
| break; |
| } |
| } |
| } |
| return retInfo; |
| } |
| |
| static ThreadInfo getThreadInfo(ThreadReference tr) { |
| return getThreadInfo(tr.uniqueID()); |
| } |
| |
| static ThreadInfo getThreadInfo(String idToken) { |
| ThreadInfo tinfo = null; |
| if (idToken.startsWith("t@")) { |
| idToken = idToken.substring(2); |
| } |
| try { |
| long threadId = Long.decode(idToken).longValue(); |
| tinfo = getThreadInfo(threadId); |
| } catch (NumberFormatException e) { |
| tinfo = null; |
| } |
| return tinfo; |
| } |
| |
| /** |
| * Get the thread stack frames. |
| * |
| * @return a <code>List</code> of the stack frames. |
| */ |
| List<StackFrame> getStack() throws IncompatibleThreadStateException { |
| return thread.frames(); |
| } |
| |
| /** |
| * Get the current stackframe. |
| * |
| * @return the current stackframe. |
| */ |
| StackFrame getCurrentFrame() throws IncompatibleThreadStateException { |
| if (thread.frameCount() == 0) { |
| return null; |
| } |
| return thread.frame(currentFrameIndex); |
| } |
| |
| /** |
| * Invalidate the current stackframe index. |
| */ |
| void invalidate() { |
| currentFrameIndex = 0; |
| } |
| |
| /* Throw IncompatibleThreadStateException if not suspended */ |
| private void assureSuspended() throws IncompatibleThreadStateException { |
| if (!thread.isSuspended()) { |
| throw new IncompatibleThreadStateException(); |
| } |
| } |
| |
| /** |
| * Get the current stackframe index. |
| * |
| * @return the number of the current stackframe. Frame zero is the |
| * closest to the current program counter |
| */ |
| int getCurrentFrameIndex() { |
| return currentFrameIndex; |
| } |
| |
| /** |
| * Set the current stackframe to a specific frame. |
| * |
| * @param nFrame the number of the desired stackframe. Frame zero is the |
| * closest to the current program counter |
| * @exception IllegalAccessError when the thread isn't |
| * suspended or waiting at a breakpoint |
| * @exception ArrayIndexOutOfBoundsException when the |
| * requested frame is beyond the stack boundary |
| */ |
| void setCurrentFrameIndex(int nFrame) throws IncompatibleThreadStateException { |
| assureSuspended(); |
| if ((nFrame < 0) || (nFrame >= thread.frameCount())) { |
| throw new ArrayIndexOutOfBoundsException(); |
| } |
| currentFrameIndex = nFrame; |
| } |
| |
| /** |
| * Change the current stackframe to be one or more frames higher |
| * (as in, away from the current program counter). |
| * |
| * @param nFrames the number of stackframes |
| * @exception IllegalAccessError when the thread isn't |
| * suspended or waiting at a breakpoint |
| * @exception ArrayIndexOutOfBoundsException when the |
| * requested frame is beyond the stack boundary |
| */ |
| void up(int nFrames) throws IncompatibleThreadStateException { |
| setCurrentFrameIndex(currentFrameIndex + nFrames); |
| } |
| |
| /** |
| * Change the current stackframe to be one or more frames lower |
| * (as in, toward the current program counter). * |
| * @param nFrames the number of stackframes |
| * @exception IllegalAccessError when the thread isn't |
| * suspended or waiting at a breakpoint |
| * @exception ArrayIndexOutOfBoundsException when the |
| * requested frame is beyond the stack boundary |
| */ |
| void down(int nFrames) throws IncompatibleThreadStateException { |
| setCurrentFrameIndex(currentFrameIndex - nFrames); |
| } |
| |
| } |