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SubstrateVM image builder components
/*
* Copyright (c) 2017, 2017, 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 com.oracle.svm.jni;
import org.graalvm.nativeimage.ImageSingletons;
import org.graalvm.word.WordFactory;
import com.oracle.svm.core.handles.ObjectHandlesImpl;
/**
* Implementation of JNI global object handles, which are created and destroyed explicitly and are
* valid across threads. This class handles both strong and weak global handles.
*/
public final class JNIGlobalHandles {
static void initialize() {
ImageSingletons.add(JNIGlobalHandles.class, new JNIGlobalHandles());
}
// Uses ObjectHandlesImpl directly because it needs non-API functionality
public static ObjectHandlesImpl singleton() {
return ImageSingletons.lookup(JNIGlobalHandles.class).objectHandles;
}
private final ObjectHandlesImpl objectHandles = new ObjectHandlesImpl(
WordFactory.signed(Long.MIN_VALUE), JNIObjectHandles.nullHandle().subtract(1), JNIObjectHandles.nullHandle());
}