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annotate test/compiler/stable/StableConfiguration.java @ 20199:5fbeae2a02d3

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8043546: C1 optimizes @Stable instance fields with default values Reviewed-by: kvn, jrose
author vlivanov
date Thu, 10 Jul 2014 12:04:43 -0700
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20199
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package java.lang.invoke;
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26
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27 import java.lang.reflect.Method;
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28 import java.util.Properties;
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29 import sun.hotspot.WhiteBox;
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30
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31 public class StableConfiguration {
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32 static final WhiteBox WB = WhiteBox.getWhiteBox();
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33 static final boolean isStableEnabled;
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34 static final boolean isServerWithStable;
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35
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36 static {
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37 Boolean value = WB.getBooleanVMFlag("FoldStableValues");
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38 isStableEnabled = (value == null ? false : value);
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39 isServerWithStable = isStableEnabled && get();
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40 System.out.println("@Stable: " + (isStableEnabled ? "enabled" : "disabled"));
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41 System.out.println("Server Compiler: " + get());
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42 }
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43
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44 // ::get() is among immediately compiled methods.
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45 static boolean get() {
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46 try {
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47 Method m = StableConfiguration.class.getDeclaredMethod("get");
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48 int level = WB.getMethodCompilationLevel(m);
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49 if (level > 0) {
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50 return (level == 4);
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51 } else {
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52 String javaVM = System.getProperty("java.vm.name", "");
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53 if (javaVM.contains("Server")) return true;
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54 if (javaVM.contains("Client")) return false;
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55 throw new Error("Unknown VM type: "+javaVM);
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56 }
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57 } catch (NoSuchMethodException e) {
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58 throw new Error(e);
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59 }
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60 }
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61
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62 }