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.Inherited;
016    import java.lang.annotation.Retention;
017    import java.lang.annotation.Target;
018    import java.lang.annotation.RetentionPolicy;
019    import java.lang.annotation.ElementType;
020    
021    /**
022     * This annotation marks types which have fields that can be marked
023     * as either traced or untraced by the VM.  It disables GC optimizations
024     * that rely on the object pattern remaining static from build time
025     * to execution time.<p>
026     *
027     * The property conferred by this annotation applies to all its subtypes as
028     * well.
029     */
030    @Retention(RetentionPolicy.RUNTIME)
031    @Target({ElementType.TYPE})
032    @Inherited
033    public @interface ReferenceFieldsVary { }