1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2016 Azul Systems, Inc.  All Rights Reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  */
  24 
  25 /**
  26  * @test TestOnSpinWait
  27  * @summary C2: (x86 only) checks that java.lang.Runtime.onSpinWait is intrinsified
  28  * @bug 8147844
  29  * @library /testlibrary
  30  * @requires os.arch=="x86" | os.arch=="amd64" | os.arch=="x86_64"
  31  * @run main/othervm TestOnSpinWait
  32  */
  33 
  34 import java.lang.invoke.*;
  35 import jdk.test.lib.*;
  36 import static jdk.test.lib.Asserts.*;
  37 
  38 public class TestOnSpinWait {
  39 
  40     public static void main(String[] args) throws Exception {
  41         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  42           "-XX:+IgnoreUnrecognizedVMOptions", "-showversion",
  43           "-server", "-XX:-TieredCompilation", "-Xbatch",
  44           "-XX:+UseOnSpinWaitIntrinsic", "-Xcomp",
  45           "-XX:+PrintCompilation", "-XX:+UnlockDiagnosticVMOptions", 
  46           "-XX:+PrintInlining", "TestOnSpinWait$Launcher");
  47 
  48         OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
  49 
  50         analyzer.shouldHaveExitValue(0);
  51 
  52         // The test is applicable only to C2 (present in Server VM).
  53         if (analyzer.getStderr().contains("Server VM")) {
  54             analyzer.shouldContain("java.lang.Runtime::onSpinWait (1 bytes)   (intrinsic)");
  55         }
  56     }
  57 
  58     static class Launcher {
  59 
  60         public static void main(final String[] args) throws Exception {
  61             int end = 20_000;
  62 
  63             for (int i=0; i < end; i++) {
  64                 java.lang.Runtime.onSpinWait();
  65             }
  66         }
  67     }
  68 }