Mercurial > hg > graal-jvmci-8

comparison jvmci/jdk.vm.ci.common/src/jdk/vm/ci/common/InitTimer.java @ 23393:1d4ce2d19e52

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
clean up and minimize JVMCI (JDK-8156835)
author Doug Simon <doug.simon@oracle.com>
date Thu, 12 May 2016 20:57:31 +0200
parents jvmci/jdk.vm.ci.inittimer/src/jdk/vm/ci/inittimer/InitTimer.java@7b09dede4552
children 3e8ce13f4e12
comparison
equal deleted inserted replaced
23392:b3a816d3b844 23393:1d4ce2d19e52
1 /*
2 * Copyright (c) 2014, 2015, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package jdk.vm.ci.common;
24
25 import java.util.concurrent.atomic.AtomicInteger;
26
27 /**
28 * A facility for timing a step in the runtime initialization sequence. This is independent from all
29 * other JVMCI code so as to not perturb the initialization sequence. It is enabled by setting the
30 * {@code "jvmci.inittimer"} system property to {@code "true"}.
31 */
32 public final class InitTimer implements AutoCloseable {
33 final String name;
34 final long start;
35
36 private InitTimer(String name) {
37 int n = nesting.getAndIncrement();
38 if (n == 0) {
39 initializingThread = Thread.currentThread();
40 System.out.println("INITIALIZING THREAD: " + initializingThread);
41 } else {
42 assert Thread.currentThread() == initializingThread : Thread.currentThread() + " != " + initializingThread;
43 }
44 this.name = name;
45 this.start = System.currentTimeMillis();
46 System.out.println("START: " + SPACES.substring(0, n * 2) + name);
47 }
48
49 @SuppressFBWarnings(value = "ST_WRITE_TO_STATIC_FROM_INSTANCE_METHOD", justification = "only the initializing thread accesses this field")
50 public void close() {
51 final long end = System.currentTimeMillis();
52 int n = nesting.decrementAndGet();
53 System.out.println(" DONE: " + SPACES.substring(0, n * 2) + name + " [" + (end - start) + " ms]");
54 if (n == 0) {
55 initializingThread = null;
56 }
57 }
58
59 public static InitTimer timer(String name) {
60 return ENABLED ? new InitTimer(name) : null;
61 }
62
63 public static InitTimer timer(String name, Object suffix) {
64 return ENABLED ? new InitTimer(name + suffix) : null;
65 }
66
67 /**
68 * Specifies if initialization timing is enabled.
69 */
70 private static final boolean ENABLED = Boolean.getBoolean("jvmci.InitTimer");
71
72 public static final AtomicInteger nesting = ENABLED ? new AtomicInteger() : null;
73 public static final String SPACES = " ";
74
75 /**
76 * Used to assert the invariant that all related initialization happens on the same thread.
77 */
78 public static Thread initializingThread;
79 }