001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.vmmagic.pragma;
014    
015    import java.lang.annotation.Retention;
016    import java.lang.annotation.Target;
017    import java.lang.annotation.RetentionPolicy;
018    import java.lang.annotation.ElementType;
019    import org.vmmagic.Pragma;
020    
021    /**
022     * This pragma is a variant of Pure that is used to mark methods that have a
023     * special behaviour at boot image writing time and are Pure at runtime
024     */
025    @Retention(RetentionPolicy.RUNTIME)
026    @Target({ElementType.METHOD})
027    @Pragma
028    public @interface RuntimePure {
029      /** Enumeration of the special boot image return values */
030      public enum ReturnValue {
031        /** the return value is unavailable until runtime*/
032        Unavailable
033      }
034      /** What value should be returned */
035      ReturnValue value() default ReturnValue.Unavailable;
036    }