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