1 /*
   2  * Copyright (c) 2016 SAP SE. 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 
  24 /*
  25  * @test
  26  * @bug 8159620
  27  * @summary testing that -XX:-UseOnStackReplacement works with both -XX:(+/-)TieredCompilation
  28  * @modules java.base/jdk.internal.misc
  29  * @library /testlibrary /test/lib /
  30  * @build sun.hotspot.WhiteBox
  31  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  32  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  33  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+PrintCompilation
  34  *                   -XX:-BackgroundCompilation -XX:-TieredCompilation -XX:-UseOnStackReplacement DisableOSRTest
  35  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+PrintCompilation
  36  *                   -XX:-BackgroundCompilation -XX:+TieredCompilation -XX:-UseOnStackReplacement DisableOSRTest
  37  */
  38 
  39 import java.lang.reflect.Method;
  40 import java.util.Random;
  41 import sun.hotspot.WhiteBox;
  42 
  43 public class DisableOSRTest {
  44     private static final WhiteBox WB = WhiteBox.getWhiteBox();
  45     private static final Random RANDOM = new Random();
  46 
  47     public static int foo() {
  48         return RANDOM.nextInt();
  49     }
  50 
  51     public static void main(String[] args) throws Exception {
  52         Method m = DisableOSRTest.class.getMethod("main", String[].class);
  53 
  54         for (int i = 0; i < 100_000; i++) {
  55             foo();
  56         }
  57 
  58         if (WB.isMethodCompiled(m, true /* isOsr */)) {
  59             throw new RuntimeException("\"" + m + "\" shouldn't be OSR compiled if running with -XX:-UseOnStackReplacement!");
  60         }
  61     }
  62 }