author | bpb |
Wed, 19 Aug 2015 13:11:24 -0700 | |
changeset 32232 | 8d58fc5a0349 |
parent 30859 | 76147e537436 |
child 36604 | e9c073b0c19e |
child 36508 | 5f9eee6b383b |
permissions | -rw-r--r-- |
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/* |
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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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// The method 'get' below returns true if the method is server compiled |
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// and is used by the Stable tests to determine whether methods in |
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// general are being server compiled or not as the -XX:+FoldStableValues |
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// option is only applicable to -server. |
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// |
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// On aarch64 we DeOptimize when patching. This means that when the |
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// method is compiled as a result of -Xcomp it DeOptimizes immediately. |
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// The result is that getMethodCompilationLevel returns 0. This means |
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// the method returns true based on java.vm.name. |
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// |
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// However when the tests are run with -XX:+TieredCompilation and |
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// -XX:TieredStopAtLevel=1 this fails because methods will always |
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// be client compiled. |
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// |
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// Solution is to add a simple method 'get1' which should never be |
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// DeOpted and use that to determine the compilation level instead. |
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static void get1() { |
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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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get1(); |
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Method m = StableConfiguration.class.getDeclaredMethod("get1"); |
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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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} |