1 /*

     2  * Copyright (c) 2014, 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 import com.oracle.java.testlibrary.Asserts;

    25 import com.oracle.java.testlibrary.Platform;

    26 import java.util.stream.IntStream;

    27 import sun.hotspot.WhiteBox;

    28 

    29 public class CompilerUtils {

    30 

    31     private CompilerUtils() {

    32         // to prevent from instantiation

    33     }

    34 

    35     /**

    36      * Returns available compilation levels

    37      *

    38      * @return int array with compilation levels

    39      */

    40     public static int[] getAvailableCompilationLevels() {

    41         if (!WhiteBox.getWhiteBox().getBooleanVMFlag("UseCompiler")) {

    42             return new int[0];

    43         }

    44         if (WhiteBox.getWhiteBox().getBooleanVMFlag("TieredCompilation")) {

    45             Long flagValue = WhiteBox.getWhiteBox()

    46                     .getIntxVMFlag("TieredStopAtLevel");

    47             int maxLevel = flagValue.intValue();

    48             Asserts.assertEQ(new Long(maxLevel), flagValue,

    49                     "TieredStopAtLevel has value out of int capacity");

    50             return IntStream.rangeClosed(1, maxLevel).toArray();

    51         } else {

    52             if (Platform.isServer()) {

    53                 return new int[]{4};

    54             }

    55             if (Platform.isClient() || Platform.isMinimal()) {

    56                 return new int[]{1};

    57             }

    58         }

    59         return new int[0];

    60     }

    61 }