/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 2 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://opensource.org/licenses/GPL-2.0.

  */

 package org.apidesign.bck2brwsr.flow;

 import java.util.Arrays;

 import org.apidesign.vm4brwsr.Bck2Brwsr;

 /** Poweful flow analyzer. Based on internals used by Graal JVM

  * compiler.

  *

  * @author Jaroslav Tulach

  */

 public final class GraalFlowAnalyzer {

     private GraalFlowAnalyzer() {

     }

     public static Bck2Brwsr.Flow.Analyzer getDefault() {

         return Impl.DEFAULT;

     }

     private static class Impl implements Bck2Brwsr.Flow.Analyzer {

         static Impl DEFAULT = new Impl();

         private Impl() {

         }

         @Override

         public boolean analyze(final Bck2Brwsr.Flow result) {

             /*

             // Delete the previous line and fix pom.xml, David.

             try {

                 new com.oracle.graal.tag.codegen.BCCodeGenerator(

                     com.oracle.graal.tag.BCTagDriver.tagGraph(result.getMethodByteCode())

                 ) {

                     @Override

                     protected void emitIfStart(int bci, String txt) {

                         System.err.println("if { // " + bci);

                         result.beginIfAt(bci);

                     }

                     @Override

                     protected void emitEnd(int bci) {

                         System.err.println("} // " + bci);

                         result.endAt(bci);

                     }

                     @Override

                     protected void emitElseHeader(int bci) {

                         System.err.println("else { //" + bci);

                         result.beginElseAt(bci);

                     }

                     @Override

                     protected void emitLoopHeader(int bci) {

                         System.err.println("for (;;) { // " + bci);

                         result.beginLoopAt(bci);

                     }

                     @Override

                     protected void emitBreak(int bci) {

                         System.err.println("break; // " + bci);

                         result.breakAt(bci);

                     }

                     @Override

                     protected void emit(String txt) {

                     }

                 }.GenBCCode();

                 return true;

             } catch (Exception e) {

                 e.printStackTrace();

             }

             // */

             byte[] simpleLoopTestMock = { 3, 60, 3, 61, 28, 26, -94, 0, 13, 27, 28, 96, 60, -124, 2, 1, -89, -1, -12, 27, 26, 104, -84 };

             if (Arrays.equals(

                 simpleLoopTestMock,

                 result.getMethodByteCode()

             )) {

                 result.beginLoopAt(4); // for (;;) { // 4

                 result.beginIfAt(6); // if { // 6

                 result.breakAt(9); // ;break; // 9

                 result.endAt(9); // ;} // 9

                 result.beginElseAt(9); // else { //9

                 result.endAt(19); // } // 19

                 result.endAt(19); // } // 19

                 return true;

             }

             return false;

         }

     }

 }