63 lines
2.5 KiB
Java
63 lines
2.5 KiB
Java
/*
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.invoke;
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import java.lang.reflect.Method;
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import java.util.Properties;
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import sun.hotspot.WhiteBox;
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public class StableConfiguration {
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static final WhiteBox WB = WhiteBox.getWhiteBox();
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static final boolean isStableEnabled;
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static final boolean isServerWithStable;
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static {
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Boolean value = WB.getBooleanVMFlag("FoldStableValues");
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isStableEnabled = (value == null ? false : value);
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isServerWithStable = isStableEnabled && get();
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System.out.println("@Stable: " + (isStableEnabled ? "enabled" : "disabled"));
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System.out.println("Server Compiler: " + get());
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}
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// ::get() is among immediately compiled methods.
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static boolean get() {
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try {
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Method m = StableConfiguration.class.getDeclaredMethod("get");
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int level = WB.getMethodCompilationLevel(m);
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if (level > 0) {
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return (level == 4);
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} else {
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String javaVM = System.getProperty("java.vm.name", "");
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if (javaVM.contains("Server")) return true;
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if (javaVM.contains("Client")) return false;
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throw new Error("Unknown VM type: "+javaVM);
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}
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} catch (NoSuchMethodException e) {
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throw new Error(e);
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}
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}
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}
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