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annotate jvmci/jdk.vm.ci.common/src/jdk/vm/ci/common/InitTimer.java @ 24226:abc19eb35547

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allow java.vm.name and java.vm.version to be initialized from a vm.properties file next to libjvm
author Doug Simon <doug.simon@oracle.com>
date Thu, 24 Aug 2017 22:20:40 +0200
parents 9e1235406b59
children
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1 /*
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2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
66a9286203a2 decoupled Graal runtime initialization and Graal compilation queue initialization
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5 * This code is free software; you can redistribute it and/or modify it
66a9286203a2 decoupled Graal runtime initialization and Graal compilation queue initialization
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6 * under the terms of the GNU General Public License version 2 only, as
66a9286203a2 decoupled Graal runtime initialization and Graal compilation queue initialization
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
66a9286203a2 decoupled Graal runtime initialization and Graal compilation queue initialization
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
66a9286203a2 decoupled Graal runtime initialization and Graal compilation queue initialization
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
66a9286203a2 decoupled Graal runtime initialization and Graal compilation queue initialization
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
66a9286203a2 decoupled Graal runtime initialization and Graal compilation queue initialization
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15 * You should have received a copy of the GNU General Public License version
66a9286203a2 decoupled Graal runtime initialization and Graal compilation queue initialization
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
66a9286203a2 decoupled Graal runtime initialization and Graal compilation queue initialization
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package jdk.vm.ci.common;
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24
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25 import java.util.concurrent.atomic.AtomicInteger;
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26
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27 /**
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28 * A facility for timing a step in the runtime initialization sequence. This is independent from all
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29 * other JVMCI code so as to not perturb the initialization sequence. It is enabled by setting the
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30 * {@code "jvmci.inittimer"} system property to {@code "true"}.
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31 */
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32 public final class InitTimer implements AutoCloseable {
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33 private final String name;
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34 private final long start;
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35
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36 private InitTimer(String name) {
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37 int n = nesting.getAndIncrement();
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38 if (n == 0) {
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39 initializingThread = Thread.currentThread();
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40 System.out.println("INITIALIZING THREAD: " + initializingThread);
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41 } else {
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42 assert Thread.currentThread() == initializingThread : Thread.currentThread() + " != " + initializingThread;
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43 }
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44 this.name = name;
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45 this.start = System.currentTimeMillis();
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46 System.out.println("START: " + SPACES.substring(0, n * 2) + name);
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47 }
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48
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49 @SuppressFBWarnings(value = "ST_WRITE_TO_STATIC_FROM_INSTANCE_METHOD", justification = "only the initializing thread accesses this field")
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50 public void close() {
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51 final long end = System.currentTimeMillis();
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52 int n = nesting.decrementAndGet();
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53 System.out.println(" DONE: " + SPACES.substring(0, n * 2) + name + " [" + (end - start) + " ms]");
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54 if (n == 0) {
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55 initializingThread = null;
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56 }
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57 }
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58
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59 public static InitTimer timer(String name) {
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60 return ENABLED ? new InitTimer(name) : null;
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61 }
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62
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63 public static InitTimer timer(String name, Object suffix) {
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64 return ENABLED ? new InitTimer(name + suffix) : null;
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65 }
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66
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67 /**
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68 * Specifies if initialization timing is enabled. Note: This property cannot use
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69 * {@code HotSpotJVMCIRuntime.Option} since that class is not visible from this package.
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70 */
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71 private static final boolean ENABLED = Boolean.getBoolean("jvmci.InitTimer");
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72
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73 public static final AtomicInteger nesting = ENABLED ? new AtomicInteger() : null;
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74 public static final String SPACES = " ";
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75
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76 /**
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77 * Used to assert the invariant that all related initialization happens on the same thread.
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78 */
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79 static Thread initializingThread;
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80 }