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vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
Sat, 29 Dec 2012 20:10:10 +0100
changeset 398 945c799a6812
parent 397 2adac52f955e
child 399 1679cdfe4172
permissions -rw-r--r--
Use only single try/catch on when there is no branching point 
     1 /**

     2  * Back 2 Browser Bytecode Translator

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

     4  *

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

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

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

     8  *

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

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

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12  * GNU General Public License for more details.

    13  *

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

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

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

    17  */

    18 package org.apidesign.vm4brwsr;

    19 

    20 import java.io.IOException;

    21 import java.io.InputStream;

    22 import org.apidesign.javap.AnnotationParser;

    23 import org.apidesign.javap.ClassData;

    24 import org.apidesign.javap.FieldData;

    25 import org.apidesign.javap.MethodData;

    26 import org.apidesign.javap.StackMapIterator;

    27 import static org.apidesign.javap.RuntimeConstants.*;

    28 import org.apidesign.javap.TrapData;

    29 import org.apidesign.javap.TrapDataIterator;

    30 

    31 /** Translator of the code inside class files to JavaScript.

    32  *

    33  * @author Jaroslav Tulach <jtulach@netbeans.org>

    34  */

    35 abstract class ByteCodeToJavaScript {

    36     private ClassData jc;

    37     final Appendable out;

    38 

    39     protected ByteCodeToJavaScript(Appendable out) {

    40         this.out = out;

    41     }

    42     

    43     /* Collects additional required resources.

    44      * 

    45      * @param internalClassName classes that were referenced and should be loaded in order the

    46      *   generated JavaScript code works properly. The names are in internal 

    47      *   JVM form so String is <code>java/lang/String</code>. 

    48      */

    49     protected abstract boolean requireReference(String internalClassName);

    50     

    51     /*

    52      * @param resourcePath name of resources to read

    53      */

    54     protected abstract void requireScript(String resourcePath);

    55     

    56     /** Allows subclasses to redefine what field a function representing a

    57      * class gets assigned. By default it returns the suggested name followed

    58      * by <code>" = "</code>;

    59      * 

    60      * @param className suggested name of the class

    61      */

    62     /* protected */ String assignClass(String className) {

    63         return className + " = ";

    64     }

    65     /* protected */ String accessClass(String classOperation) {

    66         return classOperation;

    67     }

    68 

    69     /**

    70      * Converts a given class file to a JavaScript version.

    71      *

    72      * @param classFile input stream with code of the .class file

    73      * @return the initialization code for this class, if any. Otherwise <code>null</code>

    74      * 

    75      * @throws IOException if something goes wrong during read or write or translating

    76      */

    77     

    78     public String compile(InputStream classFile) throws IOException {

    79         this.jc = new ClassData(classFile);

    80         if (jc.getMajor_version() < 50) {

    81             throw new IOException("Can't compile " + jc.getClassName() + ". Class file version " + jc.getMajor_version() + "."

    82                 + jc.getMinor_version() + " - recompile with -target 1.6 (at least)."

    83             );

    84         }

    85         byte[] arrData = jc.findAnnotationData(true);

    86         String[] arr = findAnnotation(arrData, jc, 

    87             "org.apidesign.bck2brwsr.core.ExtraJavaScript", 

    88             "resource", "processByteCode"

    89         );

    90         if (arr != null) {

    91             requireScript(arr[0]);

    92             if ("0".equals(arr[1])) {

    93                 return null;

    94             }

    95         }

    96         String[] proto = findAnnotation(arrData, jc, 

    97             "org.apidesign.bck2brwsr.core.JavaScriptPrototype", 

    98             "container", "prototype"

    99         );

   100         StringArray toInitilize = new StringArray();

   101         final String className = className(jc);

   102         out.append("\n\n").append(assignClass(className));

   103         out.append("function CLS() {");

   104         out.append("\n  if (!CLS.prototype.$instOf_").append(className).append(") {");

   105         for (FieldData v : jc.getFields()) {

   106             if (v.isStatic()) {

   107                 out.append("\n  CLS.").append(v.getName()).append(initField(v));

   108             }

   109         }

   110         if (proto == null) {

   111             String sc = jc.getSuperClassName(); // with _

   112             out.append("\n    var pp = ").

   113                 append(accessClass(sc.replace('/', '_'))).append("(true);");

   114             out.append("\n    var p = CLS.prototype = pp;");

   115             out.append("\n    var c = p;");

   116             out.append("\n    var sprcls = pp.constructor.$class;");

   117         } else {

   118             out.append("\n    var p = CLS.prototype = ").append(proto[1]).append(";");

   119             if (proto[0] == null) {

   120                 proto[0] = "p";

   121             }

   122             out.append("\n    var c = ").append(proto[0]).append(";");

   123             out.append("\n    var sprcls = null;");

   124         }

   125         for (MethodData m : jc.getMethods()) {

   126             byte[] onlyArr = m.findAnnotationData(true);

   127             String[] only = findAnnotation(onlyArr, jc, 

   128                 "org.apidesign.bck2brwsr.core.JavaScriptOnly", 

   129                 "name", "value"

   130             );

   131             if (only != null) {

   132                 if (only[0] != null && only[1] != null) {

   133                     out.append("\n    p.").append(only[0]).append(" = ")

   134                         .append(only[1]).append(";");

   135                 }

   136                 continue;

   137             }

   138             String prefix;

   139             String mn;

   140             if (m.isStatic()) {

   141                 prefix = "\n    c.";

   142                 mn = generateStaticMethod(prefix, m, toInitilize);

   143             } else {

   144                 if (m.isConstructor()) {

   145                     prefix = "\n    CLS.";

   146                     mn = generateInstanceMethod(prefix, m);

   147                 } else {

   148                     prefix = "\n    c.";

   149                     mn = generateInstanceMethod(prefix, m);

   150                 }

   151             }

   152             byte[] runAnno = m.findAnnotationData(false);

   153             if (runAnno != null) {

   154                 out.append(prefix).append(mn).append(".anno = {");

   155                 generateAnno(jc, out, runAnno);

   156                 out.append("\n    };");

   157             }

   158             out.append(prefix).append(mn).append(".access = " + m.getAccess()).append(";");

   159         }

   160         out.append("\n    c.constructor = CLS;");

   161         out.append("\n    c.$instOf_").append(className).append(" = true;");

   162         for (String superInterface : jc.getSuperInterfaces()) {

   163             out.append("\n    c.$instOf_").append(superInterface.replace('/', '_')).append(" = true;");

   164         }

   165         out.append("\n    CLS.$class = ");

   166         out.append(accessClass("java_lang_Class(true);"));

   167         out.append("\n    CLS.$class.jvmName = '").append(jc.getClassName()).append("';");

   168         out.append("\n    CLS.$class.superclass = sprcls;");

   169         out.append("\n    CLS.$class.access = ").append(jc.getAccessFlags()+";");

   170         out.append("\n    CLS.$class.cnstr = CLS;");

   171         byte[] classAnno = jc.findAnnotationData(false);

   172         if (classAnno != null) {

   173             out.append("\n    CLS.$class.anno = {");

   174             generateAnno(jc, out, classAnno);

   175             out.append("\n    };");

   176         }

   177         out.append("\n  }");

   178         out.append("\n  if (arguments.length === 0) {");

   179         out.append("\n    if (!(this instanceof CLS)) {");

   180         out.append("\n      return new CLS();");

   181         out.append("\n    }");

   182         for (FieldData v : jc.getFields()) {

   183             byte[] onlyArr = v.findAnnotationData(true);

   184             String[] only = findAnnotation(onlyArr, jc, 

   185                 "org.apidesign.bck2brwsr.core.JavaScriptOnly", 

   186                 "name", "value"

   187             );

   188             if (only != null) {

   189                 if (only[0] != null && only[1] != null) {

   190                     out.append("\n    p.").append(only[0]).append(" = ")

   191                         .append(only[1]).append(";");

   192                 }

   193                 continue;

   194             }

   195             if (!v.isStatic()) {

   196                 out.append("\n    this.fld_").

   197                     append(v.getName()).append(initField(v));

   198             }

   199         }

   200         out.append("\n    return this;");

   201         out.append("\n  }");

   202         out.append("\n  return arguments[0] ? new CLS() : CLS.prototype;");

   203         out.append("\n}");

   204         StringBuilder sb = new StringBuilder();

   205         for (String init : toInitilize.toArray()) {

   206             sb.append("\n").append(init).append("();");

   207         }

   208         return sb.toString();

   209     }

   210     private String generateStaticMethod(String prefix, MethodData m, StringArray toInitilize) throws IOException {

   211         String jsb = javaScriptBody(prefix, m, true);

   212         if (jsb != null) {

   213             return jsb;

   214         }

   215         final String mn = findMethodName(m, new StringBuilder());

   216         if (mn.equals("class__V")) {

   217             toInitilize.add(accessClass(className(jc)) + "(false)." + mn);

   218         }

   219         generateMethod(prefix, mn, m);

   220         return mn;

   221     }

   222 

   223     private String generateInstanceMethod(String prefix, MethodData m) throws IOException {

   224         String jsb = javaScriptBody(prefix, m, false);

   225         if (jsb != null) {

   226             return jsb;

   227         }

   228         final String mn = findMethodName(m, new StringBuilder());

   229         generateMethod(prefix, mn, m);

   230         return mn;

   231     }

   232 

   233     private void generateMethod(String prefix, String name, MethodData m)

   234             throws IOException {

   235         final StackMapIterator stackMapIterator = m.createStackMapIterator();

   236         TrapDataIterator trap = m.getTrapDataIterator();

   237         final LocalsMapper lmapper =

   238                 new LocalsMapper(stackMapIterator.getArguments());

   239 

   240         out.append(prefix).append(name).append(" = function(");

   241         lmapper.outputArguments(out);

   242         out.append(") {").append("\n");

   243 

   244         final byte[] byteCodes = m.getCode();

   245         if (byteCodes == null) {

   246             out.append("  throw 'no code found for ")

   247                .append(m.getInternalSig()).append("';\n");

   248             out.append("};");

   249             return;

   250         }

   251 

   252         final StackMapper smapper = new StackMapper();

   253 

   254         final int maxLocals = m.getMaxLocals();

   255         if (maxLocals > 0) {

   256             // TODO: generate only used local variables

   257             for (int j = 0; j <= VarType.LAST; ++j) {

   258                 out.append("\n  var ").append(Variable.getLocalVariable(j, 0));

   259                 for (int i = 1; i < maxLocals; ++i) {

   260                     out.append(", ");

   261                     out.append(Variable.getLocalVariable(j, i));

   262                 }

   263                 out.append(';');

   264             }

   265         }

   266 

   267         // maxStack includes two stack positions for every pushed long / double

   268         // so this might generate more stack variables than we need

   269         final int maxStack = m.getMaxStack();

   270         if (maxStack > 0) {

   271             // TODO: generate only used stack variables

   272             for (int j = 0; j <= VarType.LAST; ++j) {

   273                 out.append("\n  var ").append(Variable.getStackVariable(j, 0));

   274                 for (int i = 1; i < maxStack; ++i) {

   275                     out.append(", ");

   276                     out.append(Variable.getStackVariable(j, i));

   277                 }

   278                 out.append(';');

   279             }

   280         }

   281 

   282         int lastStackFrame = -1;

   283         TrapData[] previousTrap = null;

   284         

   285         out.append("\n  var gt = 0;\n  for(;;) switch(gt) {\n");

   286         for (int i = 0; i < byteCodes.length; i++) {

   287             int prev = i;

   288             stackMapIterator.advanceTo(i);

   289             boolean changeInCatch = trap.advanceTo(i);

   290             if (changeInCatch || lastStackFrame != stackMapIterator.getFrameIndex()) {

   291                 if (previousTrap != null) {

   292                     generateCatch(previousTrap);

   293                     previousTrap = null;

   294                 }

   295             }

   296             if (lastStackFrame != stackMapIterator.getFrameIndex()) {

   297                 lastStackFrame = stackMapIterator.getFrameIndex();

   298                 lmapper.syncWithFrameLocals(stackMapIterator.getFrameLocals());

   299                 smapper.syncWithFrameStack(stackMapIterator.getFrameStack());

   300                 out.append("    case " + i).append(": ");            

   301                 changeInCatch = true;

   302             } else {

   303                 out.append("    /* " + i).append(" */ ");

   304             }

   305             if (changeInCatch && trap.useTry()) {

   306                 out.append("try {");

   307                 previousTrap = trap.current();

   308             }

   309             final int c = readByte(byteCodes, i);

   310             switch (c) {

   311                 case opc_aload_0:

   312                     emit(out, "@1 = @2;", smapper.pushA(), lmapper.getA(0));

   313                     break;

   314                 case opc_iload_0:

   315                     emit(out, "@1 = @2;", smapper.pushI(), lmapper.getI(0));

   316                     break;

   317                 case opc_lload_0:

   318                     emit(out, "@1 = @2;", smapper.pushL(), lmapper.getL(0));

   319                     break;

   320                 case opc_fload_0:

   321                     emit(out, "@1 = @2;", smapper.pushF(), lmapper.getF(0));

   322                     break;

   323                 case opc_dload_0:

   324                     emit(out, "@1 = @2;", smapper.pushD(), lmapper.getD(0));

   325                     break;

   326                 case opc_aload_1:

   327                     emit(out, "@1 = @2;", smapper.pushA(), lmapper.getA(1));

   328                     break;

   329                 case opc_iload_1:

   330                     emit(out, "@1 = @2;", smapper.pushI(), lmapper.getI(1));

   331                     break;

   332                 case opc_lload_1:

   333                     emit(out, "@1 = @2;", smapper.pushL(), lmapper.getL(1));

   334                     break;

   335                 case opc_fload_1:

   336                     emit(out, "@1 = @2;", smapper.pushF(), lmapper.getF(1));

   337                     break;

   338                 case opc_dload_1:

   339                     emit(out, "@1 = @2;", smapper.pushD(), lmapper.getD(1));

   340                     break;

   341                 case opc_aload_2:

   342                     emit(out, "@1 = @2;", smapper.pushA(), lmapper.getA(2));

   343                     break;

   344                 case opc_iload_2:

   345                     emit(out, "@1 = @2;", smapper.pushI(), lmapper.getI(2));

   346                     break;

   347                 case opc_lload_2:

   348                     emit(out, "@1 = @2;", smapper.pushL(), lmapper.getL(2));

   349                     break;

   350                 case opc_fload_2:

   351                     emit(out, "@1 = @2;", smapper.pushF(), lmapper.getF(2));

   352                     break;

   353                 case opc_dload_2:

   354                     emit(out, "@1 = @2;", smapper.pushD(), lmapper.getD(2));

   355                     break;

   356                 case opc_aload_3:

   357                     emit(out, "@1 = @2;", smapper.pushA(), lmapper.getA(3));

   358                     break;

   359                 case opc_iload_3:

   360                     emit(out, "@1 = @2;", smapper.pushI(), lmapper.getI(3));

   361                     break;

   362                 case opc_lload_3:

   363                     emit(out, "@1 = @2;", smapper.pushL(), lmapper.getL(3));

   364                     break;

   365                 case opc_fload_3:

   366                     emit(out, "@1 = @2;", smapper.pushF(), lmapper.getF(3));

   367                     break;

   368                 case opc_dload_3:

   369                     emit(out, "@1 = @2;", smapper.pushD(), lmapper.getD(3));

   370                     break;

   371                 case opc_iload: {

   372                     final int indx = readByte(byteCodes, ++i);

   373                     emit(out, "@1 = @2;", smapper.pushI(), lmapper.getI(indx));

   374                     break;

   375                 }

   376                 case opc_lload: {

   377                     final int indx = readByte(byteCodes, ++i);

   378                     emit(out, "@1 = @2;", smapper.pushL(), lmapper.getL(indx));

   379                     break;

   380                 }

   381                 case opc_fload: {

   382                     final int indx = readByte(byteCodes, ++i);

   383                     emit(out, "@1 = @2;", smapper.pushF(), lmapper.getF(indx));

   384                     break;

   385                 }

   386                 case opc_dload: {

   387                     final int indx = readByte(byteCodes, ++i);

   388                     emit(out, "@1 = @2;", smapper.pushD(), lmapper.getD(indx));

   389                     break;

   390                 }

   391                 case opc_aload: {

   392                     final int indx = readByte(byteCodes, ++i);

   393                     emit(out, "@1 = @2;", smapper.pushA(), lmapper.getA(indx));

   394                     break;

   395                 }

   396                 case opc_istore: {

   397                     final int indx = readByte(byteCodes, ++i);

   398                     emit(out, "@1 = @2;", lmapper.setI(indx), smapper.popI());

   399                     break;

   400                 }

   401                 case opc_lstore: {

   402                     final int indx = readByte(byteCodes, ++i);

   403                     emit(out, "@1 = @2;", lmapper.setL(indx), smapper.popL());

   404                     break;

   405                 }

   406                 case opc_fstore: {

   407                     final int indx = readByte(byteCodes, ++i);

   408                     emit(out, "@1 = @2;", lmapper.setF(indx), smapper.popF());

   409                     break;

   410                 }

   411                 case opc_dstore: {

   412                     final int indx = readByte(byteCodes, ++i);

   413                     emit(out, "@1 = @2;", lmapper.setD(indx), smapper.popD());

   414                     break;

   415                 }

   416                 case opc_astore: {

   417                     final int indx = readByte(byteCodes, ++i);

   418                     emit(out, "@1 = @2;", lmapper.setA(indx), smapper.popA());

   419                     break;

   420                 }

   421                 case opc_astore_0:

   422                     emit(out, "@1 = @2;", lmapper.setA(0), smapper.popA());

   423                     break;

   424                 case opc_istore_0:

   425                     emit(out, "@1 = @2;", lmapper.setI(0), smapper.popI());

   426                     break;

   427                 case opc_lstore_0:

   428                     emit(out, "@1 = @2;", lmapper.setL(0), smapper.popL());

   429                     break;

   430                 case opc_fstore_0:

   431                     emit(out, "@1 = @2;", lmapper.setF(0), smapper.popF());

   432                     break;

   433                 case opc_dstore_0:

   434                     emit(out, "@1 = @2;", lmapper.setD(0), smapper.popD());

   435                     break;

   436                 case opc_astore_1:

   437                     emit(out, "@1 = @2;", lmapper.setA(1), smapper.popA());

   438                     break;

   439                 case opc_istore_1:

   440                     emit(out, "@1 = @2;", lmapper.setI(1), smapper.popI());

   441                     break;

   442                 case opc_lstore_1:

   443                     emit(out, "@1 = @2;", lmapper.setL(1), smapper.popL());

   444                     break;

   445                 case opc_fstore_1:

   446                     emit(out, "@1 = @2;", lmapper.setF(1), smapper.popF());

   447                     break;

   448                 case opc_dstore_1:

   449                     emit(out, "@1 = @2;", lmapper.setD(1), smapper.popD());

   450                     break;

   451                 case opc_astore_2:

   452                     emit(out, "@1 = @2;", lmapper.setA(2), smapper.popA());

   453                     break;

   454                 case opc_istore_2:

   455                     emit(out, "@1 = @2;", lmapper.setI(2), smapper.popI());

   456                     break;

   457                 case opc_lstore_2:

   458                     emit(out, "@1 = @2;", lmapper.setL(2), smapper.popL());

   459                     break;

   460                 case opc_fstore_2:

   461                     emit(out, "@1 = @2;", lmapper.setF(2), smapper.popF());

   462                     break;

   463                 case opc_dstore_2:

   464                     emit(out, "@1 = @2;", lmapper.setD(2), smapper.popD());

   465                     break;

   466                 case opc_astore_3:

   467                     emit(out, "@1 = @2;", lmapper.setA(3), smapper.popA());

   468                     break;

   469                 case opc_istore_3:

   470                     emit(out, "@1 = @2;", lmapper.setI(3), smapper.popI());

   471                     break;

   472                 case opc_lstore_3:

   473                     emit(out, "@1 = @2;", lmapper.setL(3), smapper.popL());

   474                     break;

   475                 case opc_fstore_3:

   476                     emit(out, "@1 = @2;", lmapper.setF(3), smapper.popF());

   477                     break;

   478                 case opc_dstore_3:

   479                     emit(out, "@1 = @2;", lmapper.setD(3), smapper.popD());

   480                     break;

   481                 case opc_iadd:

   482                     emit(out, "@1 += @2;", smapper.getI(1), smapper.popI());

   483                     break;

   484                 case opc_ladd:

   485                     emit(out, "@1 += @2;", smapper.getL(1), smapper.popL());

   486                     break;

   487                 case opc_fadd:

   488                     emit(out, "@1 += @2;", smapper.getF(1), smapper.popF());

   489                     break;

   490                 case opc_dadd:

   491                     emit(out, "@1 += @2;", smapper.getD(1), smapper.popD());

   492                     break;

   493                 case opc_isub:

   494                     emit(out, "@1 -= @2;", smapper.getI(1), smapper.popI());

   495                     break;

   496                 case opc_lsub:

   497                     emit(out, "@1 -= @2;", smapper.getL(1), smapper.popL());

   498                     break;

   499                 case opc_fsub:

   500                     emit(out, "@1 -= @2;", smapper.getF(1), smapper.popF());

   501                     break;

   502                 case opc_dsub:

   503                     emit(out, "@1 -= @2;", smapper.getD(1), smapper.popD());

   504                     break;

   505                 case opc_imul:

   506                     emit(out, "@1 *= @2;", smapper.getI(1), smapper.popI());

   507                     break;

   508                 case opc_lmul:

   509                     emit(out, "@1 *= @2;", smapper.getL(1), smapper.popL());

   510                     break;

   511                 case opc_fmul:

   512                     emit(out, "@1 *= @2;", smapper.getF(1), smapper.popF());

   513                     break;

   514                 case opc_dmul:

   515                     emit(out, "@1 *= @2;", smapper.getD(1), smapper.popD());

   516                     break;

   517                 case opc_idiv:

   518                     emit(out, "@1 = Math.floor(@1 / @2);",

   519                          smapper.getI(1), smapper.popI());

   520                     break;

   521                 case opc_ldiv:

   522                     emit(out, "@1 = Math.floor(@1 / @2);",

   523                          smapper.getL(1), smapper.popL());

   524                     break;

   525                 case opc_fdiv:

   526                     emit(out, "@1 /= @2;", smapper.getF(1), smapper.popF());

   527                     break;

   528                 case opc_ddiv:

   529                     emit(out, "@1 /= @2;", smapper.getD(1), smapper.popD());

   530                     break;

   531                 case opc_irem:

   532                     emit(out, "@1 %= @2;", smapper.getI(1), smapper.popI());

   533                     break;

   534                 case opc_lrem:

   535                     emit(out, "@1 %= @2;", smapper.getL(1), smapper.popL());

   536                     break;

   537                 case opc_frem:

   538                     emit(out, "@1 %= @2;", smapper.getF(1), smapper.popF());

   539                     break;

   540                 case opc_drem:

   541                     emit(out, "@1 %= @2;", smapper.getD(1), smapper.popD());

   542                     break;

   543                 case opc_iand:

   544                     emit(out, "@1 &= @2;", smapper.getI(1), smapper.popI());

   545                     break;

   546                 case opc_land:

   547                     emit(out, "@1 &= @2;", smapper.getL(1), smapper.popL());

   548                     break;

   549                 case opc_ior:

   550                     emit(out, "@1 |= @2;", smapper.getI(1), smapper.popI());

   551                     break;

   552                 case opc_lor:

   553                     emit(out, "@1 |= @2;", smapper.getL(1), smapper.popL());

   554                     break;

   555                 case opc_ixor:

   556                     emit(out, "@1 ^= @2;", smapper.getI(1), smapper.popI());

   557                     break;

   558                 case opc_lxor:

   559                     emit(out, "@1 ^= @2;", smapper.getL(1), smapper.popL());

   560                     break;

   561                 case opc_ineg:

   562                     emit(out, "@1 = -@1;", smapper.getI(0));

   563                     break;

   564                 case opc_lneg:

   565                     emit(out, "@1 = -@1;", smapper.getL(0));

   566                     break;

   567                 case opc_fneg:

   568                     emit(out, "@1 = -@1;", smapper.getF(0));

   569                     break;

   570                 case opc_dneg:

   571                     emit(out, "@1 = -@1;", smapper.getD(0));

   572                     break;

   573                 case opc_ishl:

   574                     emit(out, "@1 <<= @2;", smapper.getI(1), smapper.popI());

   575                     break;

   576                 case opc_lshl:

   577                     emit(out, "@1 <<= @2;", smapper.getL(1), smapper.popI());

   578                     break;

   579                 case opc_ishr:

   580                     emit(out, "@1 >>= @2;", smapper.getI(1), smapper.popI());

   581                     break;

   582                 case opc_lshr:

   583                     emit(out, "@1 >>= @2;", smapper.getL(1), smapper.popI());

   584                     break;

   585                 case opc_iushr:

   586                     emit(out, "@1 >>>= @2;", smapper.getI(1), smapper.popI());

   587                     break;

   588                 case opc_lushr:

   589                     emit(out, "@1 >>>= @2;", smapper.getL(1), smapper.popI());

   590                     break;

   591                 case opc_iinc: {

   592                     final int varIndx = readByte(byteCodes, ++i);

   593                     final int incrBy = byteCodes[++i];

   594                     if (incrBy == 1) {

   595                         emit(out, "@1++;", lmapper.getI(varIndx));

   596                     } else {

   597                         emit(out, "@1 += @2;",

   598                              lmapper.getI(varIndx),

   599                              Integer.toString(incrBy));

   600                     }

   601                     break;

   602                 }

   603                 case opc_return:

   604                     emit(out, "return;");

   605                     break;

   606                 case opc_ireturn:

   607                     emit(out, "return @1;", smapper.popI());

   608                     break;

   609                 case opc_lreturn:

   610                     emit(out, "return @1;", smapper.popL());

   611                     break;

   612                 case opc_freturn:

   613                     emit(out, "return @1;", smapper.popF());

   614                     break;

   615                 case opc_dreturn:

   616                     emit(out, "return @1;", smapper.popD());

   617                     break;

   618                 case opc_areturn:

   619                     emit(out, "return @1;", smapper.popA());

   620                     break;

   621                 case opc_i2l:

   622                     emit(out, "@2 = @1;", smapper.popI(), smapper.pushL());

   623                     break;

   624                 case opc_i2f:

   625                     emit(out, "@2 = @1;", smapper.popI(), smapper.pushF());

   626                     break;

   627                 case opc_i2d:

   628                     emit(out, "@2 = @1;", smapper.popI(), smapper.pushD());

   629                     break;

   630                 case opc_l2i:

   631                     emit(out, "@2 = @1;", smapper.popL(), smapper.pushI());

   632                     break;

   633                     // max int check?

   634                 case opc_l2f:

   635                     emit(out, "@2 = @1;", smapper.popL(), smapper.pushF());

   636                     break;

   637                 case opc_l2d:

   638                     emit(out, "@2 = @1;", smapper.popL(), smapper.pushD());

   639                     break;

   640                 case opc_f2d:

   641                     emit(out, "@2 = @1;", smapper.popF(), smapper.pushD());

   642                     break;

   643                 case opc_d2f:

   644                     emit(out, "@2 = @1;", smapper.popD(), smapper.pushF());

   645                     break;

   646                 case opc_f2i:

   647                     emit(out, "@2 = Math.floor(@1);",

   648                          smapper.popF(), smapper.pushI());

   649                     break;

   650                 case opc_f2l:

   651                     emit(out, "@2 = Math.floor(@1);",

   652                          smapper.popF(), smapper.pushL());

   653                     break;

   654                 case opc_d2i:

   655                     emit(out, "@2 = Math.floor(@1);",

   656                          smapper.popD(), smapper.pushI());

   657                     break;

   658                 case opc_d2l:

   659                     emit(out, "@2 = Math.floor(@1);",

   660                          smapper.popD(), smapper.pushL());

   661                     break;

   662                 case opc_i2b:

   663                 case opc_i2c:

   664                 case opc_i2s:

   665                     out.append("{ /* number conversion */ }");

   666                     break;

   667                 case opc_aconst_null:

   668                     emit(out, "@1 = null;", smapper.pushA());

   669                     break;

   670                 case opc_iconst_m1:

   671                     emit(out, "@1 = -1;", smapper.pushI());

   672                     break;

   673                 case opc_iconst_0:

   674                     emit(out, "@1 = 0;", smapper.pushI());

   675                     break;

   676                 case opc_dconst_0:

   677                     emit(out, "@1 = 0;", smapper.pushD());

   678                     break;

   679                 case opc_lconst_0:

   680                     emit(out, "@1 = 0;", smapper.pushL());

   681                     break;

   682                 case opc_fconst_0:

   683                     emit(out, "@1 = 0;", smapper.pushF());

   684                     break;

   685                 case opc_iconst_1:

   686                     emit(out, "@1 = 1;", smapper.pushI());

   687                     break;

   688                 case opc_lconst_1:

   689                     emit(out, "@1 = 1;", smapper.pushL());

   690                     break;

   691                 case opc_fconst_1:

   692                     emit(out, "@1 = 1;", smapper.pushF());

   693                     break;

   694                 case opc_dconst_1:

   695                     emit(out, "@1 = 1;", smapper.pushD());

   696                     break;

   697                 case opc_iconst_2:

   698                     emit(out, "@1 = 2;", smapper.pushI());

   699                     break;

   700                 case opc_fconst_2:

   701                     emit(out, "@1 = 2;", smapper.pushF());

   702                     break;

   703                 case opc_iconst_3:

   704                     emit(out, "@1 = 3;", smapper.pushI());

   705                     break;

   706                 case opc_iconst_4:

   707                     emit(out, "@1 = 4;", smapper.pushI());

   708                     break;

   709                 case opc_iconst_5:

   710                     emit(out, "@1 = 5;", smapper.pushI());

   711                     break;

   712                 case opc_ldc: {

   713                     int indx = readByte(byteCodes, ++i);

   714                     String v = encodeConstant(indx);

   715                     int type = VarType.fromConstantType(jc.getTag(indx));

   716                     emit(out, "@1 = @2;", smapper.pushT(type), v);

   717                     break;

   718                 }

   719                 case opc_ldc_w:

   720                 case opc_ldc2_w: {

   721                     int indx = readIntArg(byteCodes, i);

   722                     i += 2;

   723                     String v = encodeConstant(indx);

   724                     int type = VarType.fromConstantType(jc.getTag(indx));

   725                     emit(out, "@1 = @2;", smapper.pushT(type), v);

   726                     break;

   727                 }

   728                 case opc_lcmp:

   729                     emit(out, "@3 = (@2 == @1) ? 0 : ((@2 < @1) ? -1 : 1);",

   730                          smapper.popL(), smapper.popL(), smapper.pushI());

   731                     break;

   732                 case opc_fcmpl:

   733                 case opc_fcmpg:

   734                     emit(out, "@3 = (@2 == @1) ? 0 : ((@2 < @1) ? -1 : 1);",

   735                          smapper.popF(), smapper.popF(), smapper.pushI());

   736                     break;

   737                 case opc_dcmpl:

   738                 case opc_dcmpg:

   739                     emit(out, "@3 = (@2 == @1) ? 0 : ((@2 < @1) ? -1 : 1);",

   740                          smapper.popD(), smapper.popD(), smapper.pushI());

   741                     break;

   742                 case opc_if_acmpeq:

   743                     i = generateIf(byteCodes, i, smapper.popA(), smapper.popA(),

   744                                    "===");

   745                     break;

   746                 case opc_if_acmpne:

   747                     i = generateIf(byteCodes, i, smapper.popA(), smapper.popA(),

   748                                    "!=");

   749                     break;

   750                 case opc_if_icmpeq:

   751                     i = generateIf(byteCodes, i, smapper.popI(), smapper.popI(),

   752                                    "==");

   753                     break;

   754                 case opc_ifeq: {

   755                     int indx = i + readIntArg(byteCodes, i);

   756                     emit(out, "if (@1 == 0) { gt = @2; continue; }",

   757                          smapper.popI(), Integer.toString(indx));

   758                     i += 2;

   759                     break;

   760                 }

   761                 case opc_ifne: {

   762                     int indx = i + readIntArg(byteCodes, i);

   763                     emit(out, "if (@1 != 0) { gt = @2; continue; }",

   764                          smapper.popI(), Integer.toString(indx));

   765                     i += 2;

   766                     break;

   767                 }

   768                 case opc_iflt: {

   769                     int indx = i + readIntArg(byteCodes, i);

   770                     emit(out, "if (@1 < 0) { gt = @2; continue; }",

   771                          smapper.popI(), Integer.toString(indx));

   772                     i += 2;

   773                     break;

   774                 }

   775                 case opc_ifle: {

   776                     int indx = i + readIntArg(byteCodes, i);

   777                     emit(out, "if (@1 <= 0) { gt = @2; continue; }",

   778                          smapper.popI(), Integer.toString(indx));

   779                     i += 2;

   780                     break;

   781                 }

   782                 case opc_ifgt: {

   783                     int indx = i + readIntArg(byteCodes, i);

   784                     emit(out, "if (@1 > 0) { gt = @2; continue; }",

   785                          smapper.popI(), Integer.toString(indx));

   786                     i += 2;

   787                     break;

   788                 }

   789                 case opc_ifge: {

   790                     int indx = i + readIntArg(byteCodes, i);

   791                     emit(out, "if (@1 >= 0) { gt = @2; continue; }",

   792                          smapper.popI(), Integer.toString(indx));

   793                     i += 2;

   794                     break;

   795                 }

   796                 case opc_ifnonnull: {

   797                     int indx = i + readIntArg(byteCodes, i);

   798                     emit(out, "if (@1 !== null) { gt = @2; continue; }",

   799                          smapper.popA(), Integer.toString(indx));

   800                     i += 2;

   801                     break;

   802                 }

   803                 case opc_ifnull: {

   804                     int indx = i + readIntArg(byteCodes, i);

   805                     emit(out, "if (@1 === null) { gt = @2; continue; }",

   806                          smapper.popA(), Integer.toString(indx));

   807                     i += 2;

   808                     break;

   809                 }

   810                 case opc_if_icmpne:

   811                     i = generateIf(byteCodes, i, smapper.popI(), smapper.popI(),

   812                                    "!=");

   813                     break;

   814                 case opc_if_icmplt:

   815                     i = generateIf(byteCodes, i, smapper.popI(), smapper.popI(),

   816                                    "<");

   817                     break;

   818                 case opc_if_icmple:

   819                     i = generateIf(byteCodes, i, smapper.popI(), smapper.popI(),

   820                                    "<=");

   821                     break;

   822                 case opc_if_icmpgt:

   823                     i = generateIf(byteCodes, i, smapper.popI(), smapper.popI(),

   824                                    ">");

   825                     break;

   826                 case opc_if_icmpge:

   827                     i = generateIf(byteCodes, i, smapper.popI(), smapper.popI(),

   828                                    ">=");

   829                     break;

   830                 case opc_goto: {

   831                     int indx = i + readIntArg(byteCodes, i);

   832                     emit(out, "gt = @1; continue;", Integer.toString(indx));

   833                     i += 2;

   834                     break;

   835                 }

   836                 case opc_lookupswitch: {

   837                     int table = i / 4 * 4 + 4;

   838                     int dflt = i + readInt4(byteCodes, table);

   839                     table += 4;

   840                     int n = readInt4(byteCodes, table);

   841                     table += 4;

   842                     out.append("switch (").append(smapper.popI()).append(") {\n");

   843                     while (n-- > 0) {

   844                         int cnstnt = readInt4(byteCodes, table);

   845                         table += 4;

   846                         int offset = i + readInt4(byteCodes, table);

   847                         table += 4;

   848                         out.append("  case " + cnstnt).append(": gt = " + offset).append("; continue;\n");

   849                     }

   850                     out.append("  default: gt = " + dflt).append("; continue;\n}");

   851                     i = table - 1;

   852                     break;

   853                 }

   854                 case opc_tableswitch: {

   855                     int table = i / 4 * 4 + 4;

   856                     int dflt = i + readInt4(byteCodes, table);

   857                     table += 4;

   858                     int low = readInt4(byteCodes, table);

   859                     table += 4;

   860                     int high = readInt4(byteCodes, table);

   861                     table += 4;

   862                     out.append("switch (").append(smapper.popI()).append(") {\n");

   863                     while (low <= high) {

   864                         int offset = i + readInt4(byteCodes, table);

   865                         table += 4;

   866                         out.append("  case " + low).append(": gt = " + offset).append("; continue;\n");

   867                         low++;

   868                     }

   869                     out.append("  default: gt = " + dflt).append("; continue;\n}");

   870                     i = table - 1;

   871                     break;

   872                 }

   873                 case opc_invokeinterface: {

   874                     i = invokeVirtualMethod(byteCodes, i, smapper) + 2;

   875                     break;

   876                 }

   877                 case opc_invokevirtual:

   878                     i = invokeVirtualMethod(byteCodes, i, smapper);

   879                     break;

   880                 case opc_invokespecial:

   881                     i = invokeStaticMethod(byteCodes, i, smapper, false);

   882                     break;

   883                 case opc_invokestatic:

   884                     i = invokeStaticMethod(byteCodes, i, smapper, true);

   885                     break;

   886                 case opc_new: {

   887                     int indx = readIntArg(byteCodes, i);

   888                     String ci = jc.getClassName(indx);

   889                     emit(out, "@1 = new @2;",

   890                          smapper.pushA(), accessClass(ci.replace('/', '_')));

   891                     addReference(ci);

   892                     i += 2;

   893                     break;

   894                 }

   895                 case opc_newarray:

   896                     ++i; // skip type of array

   897                     emit(out, "@2 = new Array(@1).fillNulls();",

   898                          smapper.popI(), smapper.pushA());

   899                     break;

   900                 case opc_anewarray:

   901                     i += 2; // skip type of array

   902                     emit(out, "@2 = new Array(@1).fillNulls();",

   903                          smapper.popI(), smapper.pushA());

   904                     break;

   905                 case opc_multianewarray: {

   906                     i += 2;

   907                     int dim = readByte(byteCodes, ++i);

   908                     out.append("{ var a0 = new Array(").append(smapper.popI())

   909                        .append(").fillNulls();");

   910                     for (int d = 1; d < dim; d++) {

   911                         out.append("\n  var l" + d).append(" = ")

   912                            .append(smapper.popI()).append(';');

   913                         out.append("\n  for (var i" + d).append (" = 0; i" + d).

   914                             append(" < a" + (d - 1)).

   915                             append(".length; i" + d).append("++) {");

   916                         out.append("\n    var a" + d).

   917                             append (" = new Array(l" + d).append(").fillNulls();");

   918                         out.append("\n    a" + (d - 1)).append("[i" + d).append("] = a" + d).

   919                             append(";");

   920                     }

   921                     for (int d = 1; d < dim; d++) {

   922                         out.append("\n  }");

   923                     }

   924                     out.append("\n").append(smapper.pushA()).append(" = a0; }");

   925                     break;

   926                 }

   927                 case opc_arraylength:

   928                     emit(out, "@2 = @1.length;", smapper.popA(), smapper.pushI());

   929                     break;

   930                 case opc_lastore:

   931                     emit(out, "@3[@2] = @1;",

   932                          smapper.popL(), smapper.popI(), smapper.popA());

   933                     break;

   934                 case opc_fastore:

   935                     emit(out, "@3[@2] = @1;",

   936                          smapper.popF(), smapper.popI(), smapper.popA());

   937                     break;

   938                 case opc_dastore:

   939                     emit(out, "@3[@2] = @1;",

   940                          smapper.popD(), smapper.popI(), smapper.popA());

   941                     break;

   942                 case opc_aastore:

   943                     emit(out, "@3[@2] = @1;",

   944                          smapper.popA(), smapper.popI(), smapper.popA());

   945                     break;

   946                 case opc_iastore:

   947                 case opc_bastore:

   948                 case opc_castore:

   949                 case opc_sastore:

   950                     emit(out, "@3[@2] = @1;",

   951                          smapper.popI(), smapper.popI(), smapper.popA());

   952                     break;

   953                 case opc_laload:

   954                     emit(out, "@3 = @2[@1];",

   955                          smapper.popI(), smapper.popA(), smapper.pushL());

   956                     break;

   957                 case opc_faload:

   958                     emit(out, "@3 = @2[@1];",

   959                          smapper.popI(), smapper.popA(), smapper.pushF());

   960                     break;

   961                 case opc_daload:

   962                     emit(out, "@3 = @2[@1];",

   963                          smapper.popI(), smapper.popA(), smapper.pushD());

   964                     break;

   965                 case opc_aaload:

   966                     emit(out, "@3 = @2[@1];",

   967                          smapper.popI(), smapper.popA(), smapper.pushA());

   968                     break;

   969                 case opc_iaload:

   970                 case opc_baload:

   971                 case opc_caload:

   972                 case opc_saload:

   973                     emit(out, "@3 = @2[@1];",

   974                          smapper.popI(), smapper.popA(), smapper.pushI());

   975                     break;

   976                 case opc_pop:

   977                 case opc_pop2:

   978                     smapper.pop(1);

   979                     out.append("/* pop */");

   980                     break;

   981                 case opc_dup: {

   982                     final Variable v = smapper.get(0);

   983                     emit(out, "@1 = @2;", smapper.pushT(v.getType()), v);

   984                     break;

   985                 }

   986                 case opc_dup2: {

   987                     if (smapper.get(0).isCategory2()) {

   988                         final Variable v = smapper.get(0);

   989                         emit(out, "@1 = @2;", smapper.pushT(v.getType()), v);

   990                     } else {

   991                         final Variable v1 = smapper.get(0);

   992                         final Variable v2 = smapper.get(1);

   993                         emit(out, "{ @1 = @2; @3 = @4; }",

   994                              smapper.pushT(v2.getType()), v2,

   995                              smapper.pushT(v1.getType()), v1);

   996                     }

   997                     break;

   998                 }

   999                 case opc_dup_x1: {

  1000                     final Variable vi1 = smapper.pop();

  1001                     final Variable vi2 = smapper.pop();

  1002                     final Variable vo3 = smapper.pushT(vi1.getType());

  1003                     final Variable vo2 = smapper.pushT(vi2.getType());

  1004                     final Variable vo1 = smapper.pushT(vi1.getType());

  1005 

  1006                     emit(out, "{ @1 = @2; @3 = @4; @5 = @6; }",

  1007                          vo1, vi1, vo2, vi2, vo3, vo1);

  1008                     break;

  1009                 }

  1010                 case opc_dup_x2: {

  1011                     if (smapper.get(1).isCategory2()) {

  1012                         final Variable vi1 = smapper.pop();

  1013                         final Variable vi2 = smapper.pop();

  1014                         final Variable vo3 = smapper.pushT(vi1.getType());

  1015                         final Variable vo2 = smapper.pushT(vi2.getType());

  1016                         final Variable vo1 = smapper.pushT(vi1.getType());

  1017 

  1018                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; }",

  1019                              vo1, vi1, vo2, vi2, vo3, vo1);

  1020                     } else {

  1021                         final Variable vi1 = smapper.pop();

  1022                         final Variable vi2 = smapper.pop();

  1023                         final Variable vi3 = smapper.pop();

  1024                         final Variable vo4 = smapper.pushT(vi1.getType());

  1025                         final Variable vo3 = smapper.pushT(vi3.getType());

  1026                         final Variable vo2 = smapper.pushT(vi2.getType());

  1027                         final Variable vo1 = smapper.pushT(vi1.getType());

  1028 

  1029                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; @7 = @8; }",

  1030                              vo1, vi1, vo2, vi2, vo3, vi3, vo4, vo1);

  1031                     }

  1032                     break;

  1033                 }

  1034                 case opc_bipush:

  1035                     emit(out, "@1 = @2;",

  1036                          smapper.pushI(), Integer.toString(byteCodes[++i]));

  1037                     break;

  1038                 case opc_sipush:

  1039                     emit(out, "@1 = @2;",

  1040                          smapper.pushI(),

  1041                          Integer.toString(readIntArg(byteCodes, i)));

  1042                     i += 2;

  1043                     break;

  1044                 case opc_getfield: {

  1045                     int indx = readIntArg(byteCodes, i);

  1046                     String[] fi = jc.getFieldInfoName(indx);

  1047                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1048                     emit(out, "@2 = @1.fld_@3;",

  1049                          smapper.popA(), smapper.pushT(type), fi[1]);

  1050                     i += 2;

  1051                     break;

  1052                 }

  1053                 case opc_getstatic: {

  1054                     int indx = readIntArg(byteCodes, i);

  1055                     String[] fi = jc.getFieldInfoName(indx);

  1056                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1057                     emit(out, "@1 = @2(false).constructor.@3;",

  1058                          smapper.pushT(type),

  1059                          accessClass(fi[0].replace('/', '_')), fi[1]);

  1060                     i += 2;

  1061                     addReference(fi[0]);

  1062                     break;

  1063                 }

  1064                 case opc_putfield: {

  1065                     int indx = readIntArg(byteCodes, i);

  1066                     String[] fi = jc.getFieldInfoName(indx);

  1067                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1068                     emit(out, "@2.fld_@3 = @1;",

  1069                          smapper.popT(type), smapper.popA(), fi[1]);

  1070                     i += 2;

  1071                     break;

  1072                 }

  1073                 case opc_putstatic: {

  1074                     int indx = readIntArg(byteCodes, i);

  1075                     String[] fi = jc.getFieldInfoName(indx);

  1076                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1077                     emit(out, "@1(false).constructor.@2 = @3;",

  1078                          accessClass(fi[0].replace('/', '_')), fi[1],

  1079                          smapper.popT(type));

  1080                     i += 2;

  1081                     addReference(fi[0]);

  1082                     break;

  1083                 }

  1084                 case opc_checkcast: {

  1085                     int indx = readIntArg(byteCodes, i);

  1086                     final String type = jc.getClassName(indx);

  1087                     if (!type.startsWith("[")) {

  1088                         // no way to check arrays right now

  1089                         // XXX proper exception

  1090                         emit(out,

  1091                              "if (@1 !== null && !@1.$instOf_@2) throw {};",

  1092                              smapper.getA(0), type.replace('/', '_'));

  1093                     }

  1094                     i += 2;

  1095                     break;

  1096                 }

  1097                 case opc_instanceof: {

  1098                     int indx = readIntArg(byteCodes, i);

  1099                     final String type = jc.getClassName(indx);

  1100                     emit(out, "@2 = @1.$instOf_@3 ? 1 : 0;",

  1101                          smapper.popA(), smapper.pushI(),

  1102                          type.replace('/', '_'));

  1103                     i += 2;

  1104                     break;

  1105                 }

  1106                 case opc_athrow: {

  1107                     final Variable v = smapper.popA();

  1108                     smapper.clear();

  1109 

  1110                     emit(out, "{ @1 = @2; throw @2; }",

  1111                          smapper.pushA(), v);

  1112                     break;

  1113                 }

  1114 

  1115                 case opc_monitorenter: {

  1116                     out.append("/* monitor enter */");

  1117                     smapper.popA();

  1118                     break;

  1119                 }

  1120 

  1121                 case opc_monitorexit: {

  1122                     out.append("/* monitor exit */");

  1123                     smapper.popA();

  1124                     break;

  1125                 }

  1126 

  1127                 default: {

  1128                     emit(out, "throw 'unknown bytecode @1';",

  1129                          Integer.toString(c));

  1130                 }

  1131             }

  1132             out.append(" //");

  1133             for (int j = prev; j <= i; j++) {

  1134                 out.append(" ");

  1135                 final int cc = readByte(byteCodes, j);

  1136                 out.append(Integer.toString(cc));

  1137             }

  1138             out.append("\n");            

  1139         }

  1140         if (previousTrap != null) {

  1141             generateCatch(previousTrap);

  1142         }

  1143         out.append("  }\n");

  1144         out.append("};");

  1145     }

  1146 

  1147     private int generateIf(byte[] byteCodes, int i,

  1148                            final Variable v2, final Variable v1,

  1149                            final String test) throws IOException {

  1150         int indx = i + readIntArg(byteCodes, i);

  1151         out.append("if (").append(v1)

  1152            .append(' ').append(test).append(' ')

  1153            .append(v2).append(") { gt = " + indx)

  1154            .append("; continue; }");

  1155         return i + 2;

  1156     }

  1157 

  1158     private int readIntArg(byte[] byteCodes, int offsetInstruction) {

  1159         final int indxHi = byteCodes[offsetInstruction + 1] << 8;

  1160         final int indxLo = byteCodes[offsetInstruction + 2];

  1161         return (indxHi & 0xffffff00) | (indxLo & 0xff);

  1162     }

  1163     private int readInt4(byte[] byteCodes, int offsetInstruction) {

  1164         final int d = byteCodes[offsetInstruction + 0] << 24;

  1165         final int c = byteCodes[offsetInstruction + 1] << 16;

  1166         final int b = byteCodes[offsetInstruction + 2] << 8;

  1167         final int a = byteCodes[offsetInstruction + 3];

  1168         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

  1169     }

  1170     private int readByte(byte[] byteCodes, int offsetInstruction) {

  1171         return byteCodes[offsetInstruction] & 0xff;

  1172     }

  1173     

  1174     private static void countArgs(String descriptor, char[] returnType, StringBuilder sig, StringBuilder cnt) {

  1175         int i = 0;

  1176         Boolean count = null;

  1177         boolean array = false;

  1178         sig.append("__");

  1179         int firstPos = sig.length();

  1180         while (i < descriptor.length()) {

  1181             char ch = descriptor.charAt(i++);

  1182             switch (ch) {

  1183                 case '(':

  1184                     count = true;

  1185                     continue;

  1186                 case ')':

  1187                     count = false;

  1188                     continue;

  1189                 case 'B': 

  1190                 case 'C': 

  1191                 case 'D': 

  1192                 case 'F': 

  1193                 case 'I': 

  1194                 case 'J': 

  1195                 case 'S': 

  1196                 case 'Z': 

  1197                     if (count) {

  1198                         if (array) {

  1199                             sig.append("_3");

  1200                         }

  1201                         sig.append(ch);

  1202                         if (ch == 'J' || ch == 'D') {

  1203                             cnt.append('1');

  1204                         } else {

  1205                             cnt.append('0');

  1206                         }

  1207                     } else {

  1208                         sig.insert(firstPos, ch);

  1209                         if (array) {

  1210                             returnType[0] = '[';

  1211                             sig.insert(firstPos, "_3");

  1212                         } else {

  1213                             returnType[0] = ch;

  1214                         }

  1215                     }

  1216                     array = false;

  1217                     continue;

  1218                 case 'V': 

  1219                     assert !count;

  1220                     returnType[0] = 'V';

  1221                     sig.insert(firstPos, 'V');

  1222                     continue;

  1223                 case 'L':

  1224                     int next = descriptor.indexOf(';', i);

  1225                     String realSig = mangleSig(descriptor, i - 1, next + 1);

  1226                     if (count) {

  1227                         if (array) {

  1228                             sig.append("_3");

  1229                         }

  1230                         sig.append(realSig);

  1231                         cnt.append('0');

  1232                     } else {

  1233                         sig.insert(firstPos, realSig);

  1234                         if (array) {

  1235                             sig.insert(firstPos, "_3");

  1236                         }

  1237                         returnType[0] = 'L';

  1238                     }

  1239                     i = next + 1;

  1240                     continue;

  1241                 case '[':

  1242                     array = true;

  1243                     continue;

  1244                 default:

  1245                     throw new IllegalStateException("Invalid char: " + ch);

  1246             }

  1247         }

  1248     }

  1249     

  1250     private static String mangleSig(String txt, int first, int last) {

  1251         StringBuilder sb = new StringBuilder();

  1252         for (int i = first; i < last; i++) {

  1253             final char ch = txt.charAt(i);

  1254             switch (ch) {

  1255                 case '/': sb.append('_'); break;

  1256                 case '_': sb.append("_1"); break;

  1257                 case ';': sb.append("_2"); break;

  1258                 case '[': sb.append("_3"); break;

  1259                 default: sb.append(ch); break;

  1260             }

  1261         }

  1262         return sb.toString();

  1263     }

  1264 

  1265     private static String findMethodName(MethodData m, StringBuilder cnt) {

  1266         StringBuilder name = new StringBuilder();

  1267         if ("<init>".equals(m.getName())) { // NOI18N

  1268             name.append("cons"); // NOI18N

  1269         } else if ("<clinit>".equals(m.getName())) { // NOI18N

  1270             name.append("class"); // NOI18N

  1271         } else {

  1272             name.append(m.getName());

  1273         } 

  1274         

  1275         countArgs(m.getInternalSig(), new char[1], name, cnt);

  1276         return name.toString();

  1277     }

  1278 

  1279     static String findMethodName(String[] mi, StringBuilder cnt, char[] returnType) {

  1280         StringBuilder name = new StringBuilder();

  1281         String descr = mi[2];//mi.getDescriptor();

  1282         String nm= mi[1];

  1283         if ("<init>".equals(nm)) { // NOI18N

  1284             name.append("cons"); // NOI18N

  1285         } else {

  1286             name.append(nm);

  1287         }

  1288         countArgs(descr, returnType, name, cnt);

  1289         return name.toString();

  1290     }

  1291 

  1292     private int invokeStaticMethod(byte[] byteCodes, int i, final StackMapper mapper, boolean isStatic)

  1293     throws IOException {

  1294         int methodIndex = readIntArg(byteCodes, i);

  1295         String[] mi = jc.getFieldInfoName(methodIndex);

  1296         char[] returnType = { 'V' };

  1297         StringBuilder cnt = new StringBuilder();

  1298         String mn = findMethodName(mi, cnt, returnType);

  1299 

  1300         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1301         final Variable[] vars = new Variable[numArguments];

  1302 

  1303         for (int j = numArguments - 1; j >= 0; --j) {

  1304             vars[j] = mapper.pop();

  1305         }

  1306 

  1307         if (returnType[0] != 'V') {

  1308             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1309                .append(" = ");

  1310         }

  1311 

  1312         final String in = mi[0];

  1313         out.append(accessClass(in.replace('/', '_')));

  1314         out.append("(false).");

  1315         if (mn.startsWith("cons_")) {

  1316             out.append("constructor.");

  1317         }

  1318         out.append(mn);

  1319         out.append('(');

  1320         if (numArguments > 0) {

  1321             out.append(vars[0]);

  1322             for (int j = 1; j < numArguments; ++j) {

  1323                 out.append(", ");

  1324                 out.append(vars[j]);

  1325             }

  1326         }

  1327         out.append(");");

  1328         i += 2;

  1329         addReference(in);

  1330         return i;

  1331     }

  1332     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackMapper mapper)

  1333     throws IOException {

  1334         int methodIndex = readIntArg(byteCodes, i);

  1335         String[] mi = jc.getFieldInfoName(methodIndex);

  1336         char[] returnType = { 'V' };

  1337         StringBuilder cnt = new StringBuilder();

  1338         String mn = findMethodName(mi, cnt, returnType);

  1339 

  1340         final int numArguments = cnt.length() + 1;

  1341         final Variable[] vars = new Variable[numArguments];

  1342 

  1343         for (int j = numArguments - 1; j >= 0; --j) {

  1344             vars[j] = mapper.pop();

  1345         }

  1346 

  1347         if (returnType[0] != 'V') {

  1348             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1349                .append(" = ");

  1350         }

  1351 

  1352         out.append(vars[0]).append('.');

  1353         out.append(mn);

  1354         out.append('(');

  1355         out.append(vars[0]);

  1356         for (int j = 1; j < numArguments; ++j) {

  1357             out.append(", ");

  1358             out.append(vars[j]);

  1359         }

  1360         out.append(");");

  1361         i += 2;

  1362         return i;

  1363     }

  1364 

  1365     private void addReference(String cn) throws IOException {

  1366         if (requireReference(cn)) {

  1367             out.append(" /* needs ").append(cn).append(" */");

  1368         }

  1369     }

  1370 

  1371     private void outType(String d, StringBuilder out) {

  1372         int arr = 0;

  1373         while (d.charAt(0) == '[') {

  1374             out.append('A');

  1375             d = d.substring(1);

  1376         }

  1377         if (d.charAt(0) == 'L') {

  1378             assert d.charAt(d.length() - 1) == ';';

  1379             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1380         } else {

  1381             out.append(d);

  1382         }

  1383     }

  1384 

  1385     private String encodeConstant(int entryIndex) throws IOException {

  1386         String[] classRef = { null };

  1387         String s = jc.stringValue(entryIndex, classRef);

  1388         if (classRef[0] != null) {

  1389             addReference(classRef[0]);

  1390             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1391         }

  1392         return s;

  1393     }

  1394 

  1395     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1396         byte[] arr = m.findAnnotationData(true);

  1397         if (arr == null) {

  1398             return null;

  1399         }

  1400         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1401         class P extends AnnotationParser {

  1402             public P() {

  1403                 super(false);

  1404             }

  1405             

  1406             int cnt;

  1407             String[] args = new String[30];

  1408             String body;

  1409             

  1410             @Override

  1411             protected void visitAttr(String type, String attr, String at, String value) {

  1412                 if (type.equals(jvmType)) {

  1413                     if ("body".equals(attr)) {

  1414                         body = value;

  1415                     } else if ("args".equals(attr)) {

  1416                         args[cnt++] = value;

  1417                     } else {

  1418                         throw new IllegalArgumentException(attr);

  1419                     }

  1420                 }

  1421             }

  1422         }

  1423         P p = new P();

  1424         p.parse(arr, jc);

  1425         if (p.body == null) {

  1426             return null;

  1427         }

  1428         StringBuilder cnt = new StringBuilder();

  1429         final String mn = findMethodName(m, cnt);

  1430         out.append(prefix).append(mn);

  1431         out.append(" = function(");

  1432         String space;

  1433         int index;

  1434         if (!isStatic) {                

  1435             space = outputArg(out, p.args, 0);

  1436             index = 1;

  1437         } else {

  1438             space = "";

  1439             index = 0;

  1440         }

  1441         for (int i = 0; i < cnt.length(); i++) {

  1442             out.append(space);

  1443             space = outputArg(out, p.args, index);

  1444             index++;

  1445         }

  1446         out.append(") {").append("\n");

  1447         out.append(p.body);

  1448         out.append("\n}\n");

  1449         return mn;

  1450     }

  1451     private static String className(ClassData jc) {

  1452         //return jc.getName().getInternalName().replace('/', '_');

  1453         return jc.getClassName().replace('/', '_');

  1454     }

  1455     

  1456     private static String[] findAnnotation(

  1457         byte[] arr, ClassData cd, final String className, 

  1458         final String... attrNames

  1459     ) throws IOException {

  1460         if (arr == null) {

  1461             return null;

  1462         }

  1463         final String[] values = new String[attrNames.length];

  1464         final boolean[] found = { false };

  1465         final String jvmType = "L" + className.replace('.', '/') + ";";

  1466         AnnotationParser ap = new AnnotationParser(false) {

  1467             @Override

  1468             protected void visitAttr(String type, String attr, String at, String value) {

  1469                 if (type.equals(jvmType)) {

  1470                     found[0] = true;

  1471                     for (int i = 0; i < attrNames.length; i++) {

  1472                         if (attrNames[i].equals(attr)) {

  1473                             values[i] = value;

  1474                         }

  1475                     }

  1476                 }

  1477             }

  1478             

  1479         };

  1480         ap.parse(arr, cd);

  1481         return found[0] ? values : null;

  1482     }

  1483 

  1484     private CharSequence initField(FieldData v) {

  1485         final String is = v.getInternalSig();

  1486         if (is.length() == 1) {

  1487             switch (is.charAt(0)) {

  1488                 case 'S':

  1489                 case 'J':

  1490                 case 'B':

  1491                 case 'Z':

  1492                 case 'C':

  1493                 case 'I': return " = 0;";

  1494                 case 'F': 

  1495                 case 'D': return " = 0.0;";

  1496                 default:

  1497                     throw new IllegalStateException(is);

  1498             }

  1499         }

  1500         return " = null;";

  1501     }

  1502 

  1503     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1504         AnnotationParser ap = new AnnotationParser(true) {

  1505             int anno;

  1506             int cnt;

  1507             

  1508             @Override

  1509             protected void visitAnnotationStart(String type) throws IOException {

  1510                 if (anno++ > 0) {

  1511                     out.append(",");

  1512                 }

  1513                 out.append('"').append(type).append("\" : {\n");

  1514                 cnt = 0;

  1515             }

  1516 

  1517             @Override

  1518             protected void visitAnnotationEnd(String type) throws IOException {

  1519                 out.append("\n}\n");

  1520             }

  1521             

  1522             @Override

  1523             protected void visitAttr(String type, String attr, String attrType, String value) 

  1524             throws IOException {

  1525                 if (attr == null) {

  1526                     return;

  1527                 }

  1528                 if (cnt++ > 0) {

  1529                     out.append(",\n");

  1530                 }

  1531                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1532             }

  1533         };

  1534         ap.parse(data, cd);

  1535     }

  1536 

  1537     private static String outputArg(Appendable out, String[] args, int indx) throws IOException {

  1538         final String name = args[indx];

  1539         if (name == null) {

  1540             return "";

  1541         }

  1542         if (name.contains(",")) {

  1543             throw new IOException("Wrong parameter with ',': " + name);

  1544         }

  1545         out.append(name);

  1546         return ",";

  1547     }

  1548 

  1549     private static void emit(final Appendable out,

  1550                              final String format,

  1551                              final CharSequence... params) throws IOException {

  1552         final int length = format.length();

  1553 

  1554         int processed = 0;

  1555         int paramOffset = format.indexOf('@');

  1556         while ((paramOffset != -1) && (paramOffset < (length - 1))) {

  1557             final char paramChar = format.charAt(paramOffset + 1);

  1558             if ((paramChar >= '1') && (paramChar <= '9')) {

  1559                 final int paramIndex = paramChar - '0' - 1;

  1560 

  1561                 out.append(format, processed, paramOffset);

  1562                 out.append(params[paramIndex]);

  1563 

  1564                 ++paramOffset;

  1565                 processed = paramOffset + 1;

  1566             }

  1567 

  1568             paramOffset = format.indexOf('@', paramOffset + 1);

  1569         }

  1570 

  1571         out.append(format, processed, length);

  1572     }

  1573 

  1574     private void generateCatch(TrapData[] traps) throws IOException {

  1575         out.append("} catch (e) {");

  1576         for (TrapData e : traps) {

  1577             if (e == null) {

  1578                 break;

  1579             }

  1580             if (e.catch_cpx != 0) { //not finally

  1581                 final String classInternalName = jc.getClassName(e.catch_cpx);

  1582                 addReference(classInternalName);

  1583                 out.append("if (e.$instOf_" + classInternalName.replace('/', '_') + ") {");

  1584                 out.append("gt=" + e.handler_pc + "; stA0 = e; continue;");

  1585                 out.append("} ");

  1586             } else {

  1587                 //finally - todo

  1588             }

  1589         }

  1590         out.append("throw e;");

  1591         out.append("}");

  1592     }

  1593 }
hg/bck2brwsr