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 8150646
  27  * @summary Add support for blocking compiles through whitebox API
  28  * @library /testlibrary /test/lib
  29  * @build sun.hotspot.WhiteBox
  30  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  31  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  32  *
  33  * @run main/othervm
  34  *        -Xbootclasspath/a:.
  35  *        -Xmixed
  36  *        -XX:+UnlockDiagnosticVMOptions
  37  *        -XX:+WhiteBoxAPI
  38  *        -XX:+PrintCompilation
  39  *        -XX:CompileCommand=option,BlockingCompilation::foo,PrintInlining
  40  *        BlockingCompilation
  41  */
  42 
  43 import java.lang.reflect.Method;
  44 import java.util.Random;
  45 
  46 import sun.hotspot.WhiteBox;
  47 
  48 public class BlockingCompilation {
  49     private static final WhiteBox WB = WhiteBox.getWhiteBox();
  50     private static final Random RANDOM = new Random();
  51 
  52     public static int foo() {
  53         return RANDOM.nextInt();
  54     }
  55 
  56     public static void main(String[] args) throws Exception {
  57         long sum = 0;
  58         int level = 0;
  59         boolean enqued = false;
  60         Method m = BlockingCompilation.class.getMethod("foo");
  61 
  62         // Normal, non-blocking compilation
  63         for (int i = 0; i < 500_000; i++) {
  64             sum += foo();
  65             if (!enqued && WB.isMethodQueuedForCompilation(m)) {
  66                 System.out.println("==> " + m + " enqued for compilation in iteration " + i);
  67                 enqued = true;
  68             }
  69             if (WB.isMethodCompiled(m)) {
  70                 if (WB.getMethodCompilationLevel(m) != level) {
  71                     level = WB.getMethodCompilationLevel(m);
  72                     System.out.println("==> " + m + " compiled at level " + level + " in iteration " + i);
  73                     enqued = false;
  74                     if (level == 4) break;
  75                 }
  76             }
  77         }
  78 
  79         // This is necessarry because WB.deoptimizeMethod doesn't clear the methods
  80         // MDO and therefore level 3 compilations will be downgraded to level 2.
  81         WB.clearMethodState(m);
  82 
  83         // Blocking compilations on all levels
  84         for (level = 1; level <= 4; level++) {
  85             WB.deoptimizeMethod(m);
  86             WB.enqueueMethodForCompilation(m, level, true);
  87 
  88             if (!WB.isMethodCompiled(m) || WB.getMethodCompilationLevel(m) != level) {
  89                 String msg = m + " should be compiled at level " + level +
  90                              "(but is actually compiled at level " +
  91                              WB.getMethodCompilationLevel(m) + ")";
  92                 System.out.println("==> " + msg);
  93                 throw new Exception(msg);
  94             }
  95         }
  96 
  97         WB.deoptimizeMethod(m);
  98         WB.clearMethodState(m);
  99         level = 0;
 100         enqued = false;
 101         int iteration = 0;
 102 
 103         // Normal, non-blocking compilation
 104         for (int i = 0; i < 500_000; i++) {
 105             sum += foo();
 106             if (!enqued && WB.isMethodQueuedForCompilation(m)) {
 107                 System.out.println("==> " + m + " enqued for compilation in iteration " + i);
 108                 iteration = i;
 109                 enqued = true;
 110             }
 111             if (WB.isMethodCompiled(m)) {
 112                 if (WB.getMethodCompilationLevel(m) != level) {
 113                     level = WB.getMethodCompilationLevel(m);
 114                     System.out.println("==> " + m + " compiled at level " + level + " in iteration " + i);
 115                     if (level == 4 && iteration == i) {
 116                         throw new Exception("This seems to be a blocking compilation although it shouldn't.");
 117                     }
 118                     enqued = false;
 119                     if (level == 4) break;
 120                 }
 121             }
 122         }
 123     }
 124 }