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 
  24 package compiler.testlibrary;
  25 
  26 import java.util.Arrays;
  27 import jdk.test.lib.Asserts;
  28 import jdk.test.lib.Platform;
  29 import java.util.stream.IntStream;
  30 import sun.hotspot.WhiteBox;
  31 
  32 public class CompilerUtils {
  33 
  34     private CompilerUtils() {
  35         // to prevent from instantiation
  36     }
  37 
  38     /**
  39      * Returns available compilation levels
  40      *
  41      * @return int array with compilation levels
  42      */
  43     public static int[] getAvailableCompilationLevels() {
  44         if (!WhiteBox.getWhiteBox().getBooleanVMFlag("UseCompiler")) {
  45             return new int[0];
  46         }
  47         if (WhiteBox.getWhiteBox().getBooleanVMFlag("TieredCompilation")) {
  48             Long flagValue = WhiteBox.getWhiteBox()
  49                     .getIntxVMFlag("TieredStopAtLevel");
  50             int maxLevel = flagValue.intValue();
  51             Asserts.assertEQ(new Long(maxLevel), flagValue,
  52                     "TieredStopAtLevel has value out of int capacity");
  53             return IntStream.rangeClosed(1, maxLevel).toArray();
  54         } else {
  55             if (Platform.isServer()) {
  56                 return new int[]{4};
  57             }
  58             if (Platform.isClient() || Platform.isMinimal()) {
  59                 return new int[]{1};
  60             }
  61         }
  62         return new int[0];
  63     }
  64 
  65     /**
  66      * Returns maximum compilation level available
  67      * @return an int value representing maximum compilation level available
  68      */
  69     public static int getMaxCompilationLevel() {
  70         return Arrays.stream(getAvailableCompilationLevels())
  71                 .max()
  72                 .getAsInt();
  73     }
  74 }
--- EOF ---