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.jikesrvm.compilers.opt.runtimesupport.ia32;
014    
015    import org.jikesrvm.compilers.opt.regalloc.ia32.PhysicalRegisterConstants;
016    
017    /**
018     * This interface holds constants for the Opt GC map code specific to IA32
019     */
020    public interface OptGCMapIteratorConstants extends PhysicalRegisterConstants {
021    
022      // NOTE: The following two constants seem to imply that registers
023      //       that can hold references are contiguous.  This is not true,
024      //       in general, however, for the GC map code we only need to make
025      //       sure that all such registers are included in the range defined
026      //       below these contants.
027    
028      /*
029       * The index of the first nonvolatile register that may hold a reference,
030       */
031      int FIRST_GCMAP_REG = 0;
032    
033      /*
034       * the index of last register that may hold a reference
035       */ int LAST_GCMAP_REG = 7;
036    
037    }