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.driver;
014    
015    /**
016     * Class that holds miscellaneous constants used in the opt compiler
017     */
018    public interface OptConstants {
019      // the following constants are dummy bytecode indices,
020      // used to mark IR instructions that do not correspond
021      // to any original bytecode
022      int UNKNOWN_BCI = -1;
023      int PROLOGUE_BCI = -2;
024      int EPILOGUE_BCI = -3;
025      int RECTIFY_BCI = -4;
026      int SYNTH_CATCH_BCI = -5;
027      int SYNCHRONIZED_MONITORENTER_BCI = -6;
028      int SYNCHRONIZED_MONITOREXIT_BCI = -7;
029      int METHOD_COUNTER_BCI = -8;
030      int SSA_SYNTH_BCI = -9;
031      int INSTRUMENTATION_BCI = -10;
032      int RUNTIME_SERVICES_BCI = -11;
033      int EXTANT_ANALYSIS_BCI = -12;
034      int PROLOGUE_BLOCK_BCI = -13;
035      int EPILOGUE_BLOCK_BCI = -14;
036      int OSR_PROLOGUE = -15;
037      int SYNTH_LOOP_VERSIONING_BCI = -16;
038    
039      // The following are used as trinary return values in OptCompiler code
040      byte NO = 0;
041      byte YES = 1;
042      byte MAYBE = 2;
043    }