Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.common/src/jdk/vm/ci/common/InitTimer.java @ 23407:a1d1f1e4817f
Added tag jvmci-0.9 for changeset b2ca0db14546
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 30 May 2016 14:11:39 +0200 |
parents | 3e8ce13f4e12 |
children | 9e1235406b59 |
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/* * Copyright (c) 2014, 2015, 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. * * 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. */ package jdk.vm.ci.common; import java.util.concurrent.atomic.AtomicInteger; /** * A facility for timing a step in the runtime initialization sequence. This is independent from all * other JVMCI code so as to not perturb the initialization sequence. It is enabled by setting the * {@code "jvmci.inittimer"} system property to {@code "true"}. */ public final class InitTimer implements AutoCloseable { final String name; final long start; private InitTimer(String name) { int n = nesting.getAndIncrement(); if (n == 0) { initializingThread = Thread.currentThread(); System.out.println("INITIALIZING THREAD: " + initializingThread); } else { assert Thread.currentThread() == initializingThread : Thread.currentThread() + " != " + initializingThread; } this.name = name; this.start = System.currentTimeMillis(); System.out.println("START: " + SPACES.substring(0, n * 2) + name); } @SuppressFBWarnings(value = "ST_WRITE_TO_STATIC_FROM_INSTANCE_METHOD", justification = "only the initializing thread accesses this field") public void close() { final long end = System.currentTimeMillis(); int n = nesting.decrementAndGet(); System.out.println(" DONE: " + SPACES.substring(0, n * 2) + name + " [" + (end - start) + " ms]"); if (n == 0) { initializingThread = null; } } public static InitTimer timer(String name) { return ENABLED ? new InitTimer(name) : null; } public static InitTimer timer(String name, Object suffix) { return ENABLED ? new InitTimer(name + suffix) : null; } /** * Specifies if initialization timing is enabled. Note: This property cannot use * {@code HotSpotJVMCIRuntime.Option} since that class is not visible from this package. */ private static final boolean ENABLED = Boolean.getBoolean("jvmci.InitTimer"); public static final AtomicInteger nesting = ENABLED ? new AtomicInteger() : null; public static final String SPACES = " "; /** * Used to assert the invariant that all related initialization happens on the same thread. */ public static Thread initializingThread; }