001/*
002 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package jdk.internal.jvmci.hotspotvmconfig;
024
025import java.lang.annotation.*;
026
027@Target(ElementType.FIELD)
028@Retention(RetentionPolicy.RUNTIME)
029public @interface HotSpotVMValue {
030
031    /**
032     * A C++ expression to be evaluated and assigned to the field.
033     */
034    String expression();
035
036    enum Type {
037        /**
038         * A C++ address which might require extra casts to be safely assigned to a Java field.
039         */
040        ADDRESS,
041
042        /**
043         * A simple value which can be assigned to a regular Java field.
044         */
045        VALUE
046    }
047
048    /**
049     * If {@link #expression} is a C++ function name, {@link #signature} represents the signature of
050     * the function.
051     *
052     */
053    String signature() default "";
054
055    Type get() default Type.VALUE;
056
057    /**
058     * List of preprocessor symbols that should guard initialization of this value.
059     */
060    String[] defines() default {};
061
062}