author | ihse |
Tue, 22 Oct 2019 09:51:52 +0200 | |
branch | ihse-cflags-rewrite-branch |
changeset 58736 | e878a0b7cff0 |
parent 55317 | b76aee290002 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2019, 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. |
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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 jdk.vm.ci.runtime; |
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import java.util.Formatter; |
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import jdk.vm.ci.common.NativeImageReinitialize; |
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import jdk.vm.ci.services.Services; |
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public class JVMCI { |
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/** |
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* Singleton instance lazily initialized via double-checked locking. |
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*/ |
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@NativeImageReinitialize private static volatile JVMCIRuntime runtime; |
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@NativeImageReinitialize private static boolean initializing; |
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public static void initialize() { |
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// force static initializer |
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} |
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private static native JVMCIRuntime initializeRuntime(); |
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/** |
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* Gets the singleton {@link JVMCIRuntime} instance available to the application. |
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* |
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* @throws UnsupportedOperationException if JVMCI is not supported |
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*/ |
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public static JVMCIRuntime getRuntime() { |
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JVMCIRuntime result = runtime; |
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if (result == null) { |
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synchronized (JVMCI.class) { |
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result = runtime; |
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if (result == null) { |
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if (initializing) { |
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// In recursive call from HotSpotJVMCIRuntime.runtime |
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// so no need to re-enter initializeRuntime below. This |
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// path is only entered if JVMCI initialization starts |
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// with JVMCI.getRuntime(). |
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return null; |
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} |
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initializing = true; |
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try { |
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runtime = result = initializeRuntime(); |
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} catch (UnsatisfiedLinkError e) { |
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String javaHome = Services.getSavedProperty("java.home"); |
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String vmName = Services.getSavedProperty("java.vm.name"); |
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Formatter errorMessage = new Formatter(); |
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errorMessage.format("The VM does not support the JVMCI API.%n"); |
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errorMessage.format("Currently used Java home directory is %s.%n", javaHome); |
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errorMessage.format("Currently used VM configuration is: %s", vmName); |
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throw new UnsupportedOperationException(errorMessage.toString()); |
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} finally { |
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initializing = false; |
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} |
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} |
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} |
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} |
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return result; |
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} |
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} |