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vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
Thu, 20 Dec 2012 21:39:16 +0100
branchlauncher
changeset 358 f6a165f7f00f
parent 355 eea0065bcc1a
child 376 059cb07ac9b3
permissions -rw-r--r--
Loaded classes need to have their static initializes invoked. Before accessing static field of a class, initializers need to be executed as well. 
     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 

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

    30  *

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

    32  */

    33 abstract class ByteCodeToJavaScript {

    34     private ClassData jc;

    35     final Appendable out;

    36 

    37     protected ByteCodeToJavaScript(Appendable out) {

    38         this.out = out;

    39     }

    40     

    41     /* Collects additional required resources.

    42      * 

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

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

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

    46      */

    47     protected abstract boolean requireReference(String internalClassName);

    48     

    49     /*

    50      * @param resourcePath name of resources to read

    51      */

    52     protected abstract void requireScript(String resourcePath);

    53     

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

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

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

    57      * 

    58      * @param className suggested name of the class

    59      */

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

    61         return className + " = ";

    62     }

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

    64         return classOperation;

    65     }

    66 

    67     /**

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

    69      *

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

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

    72      * 

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

    74      */

    75     

    76     public String compile(InputStream classFile) throws IOException {

    77         this.jc = new ClassData(classFile);

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

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

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

    81             );

    82         }

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

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

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

    86             "resource", "processByteCode"

    87         );

    88         if (arr != null) {

    89             requireScript(arr[0]);

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

    91                 return null;

    92             }

    93         }

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

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

    96             "container", "prototype"

    97         );

    98         StringArray toInitilize = new StringArray();

    99         final String className = className(jc);

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

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

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

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

   104             if (v.isStatic()) {

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

   106             }

   107         }

   108         if (proto == null) {

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

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

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

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

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

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

   115         } else {

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

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

   118                 proto[0] = "p";

   119             }

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

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

   122         }

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

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

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

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

   127                 "name", "value"

   128             );

   129             if (only != null) {

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

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

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

   133                 }

   134                 continue;

   135             }

   136             String mn;

   137             if (m.isStatic()) {

   138                 mn = generateStaticMethod("\n    c.", m, toInitilize);

   139             } else {

   140                 mn = generateInstanceMethod("\n    c.", m);

   141             }

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

   143             if (runAnno != null) {

   144                 out.append("\n    c.").append(mn).append(".anno = {");

   145                 generateAnno(jc, out, runAnno);

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

   147             }

   148         }

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

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

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

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

   153         }

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

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

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

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

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

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

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

   161         if (classAnno != null) {

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

   163             generateAnno(jc, out, classAnno);

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

   165         }

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

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

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

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

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

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

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

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

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

   175                 "name", "value"

   176             );

   177             if (only != null) {

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

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

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

   181                 }

   182                 continue;

   183             }

   184             if (!v.isStatic()) {

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

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

   187             }

   188         }

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

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

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

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

   193         StringBuilder sb = new StringBuilder();

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

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

   196         }

   197         return sb.toString();

   198     }

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

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

   201         if (jsb != null) {

   202             return jsb;

   203         }

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

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

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

   207         }

   208         generateMethod(prefix, mn, m);

   209         return mn;

   210     }

   211 

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

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

   214         if (jsb != null) {

   215             return jsb;

   216         }

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

   218         generateMethod(prefix, mn, m);

   219         return mn;

   220     }

   221 

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

   223             throws IOException {

   224         final StackMapIterator stackMapIterator = m.createStackMapIterator();

   225         final LocalsMapper lmapper =

   226                 new LocalsMapper(stackMapIterator.getArguments());

   227 

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

   229         lmapper.outputArguments(out);

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

   231 

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

   233         if (byteCodes == null) {

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

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

   236             out.append("};");

   237             return;

   238         }

   239 

   240         final StackMapper smapper = new StackMapper();

   241 

   242         final int maxLocals = m.getMaxLocals();

   243         if (maxLocals > 0) {

   244             // TODO: generate only used local variables

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

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

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

   248                     out.append(", ");

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

   250                 }

   251                 out.append(';');

   252             }

   253         }

   254 

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

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

   257         final int maxStack = m.getMaxStack();

   258         if (maxStack > 0) {

   259             // TODO: generate only used stack variables

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

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

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

   263                     out.append(", ");

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

   265                 }

   266                 out.append(';');

   267             }

   268         }

   269 

   270         int lastStackFrame = -1;

   271 

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

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

   274             int prev = i;

   275             stackMapIterator.advanceTo(i);

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

   277                 lastStackFrame = stackMapIterator.getFrameIndex();

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

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

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

   281             } else {

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

   283             }

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

   285             switch (c) {

   286                 case opc_aload_0:

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

   288                     break;

   289                 case opc_iload_0:

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

   291                     break;

   292                 case opc_lload_0:

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

   294                     break;

   295                 case opc_fload_0:

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

   297                     break;

   298                 case opc_dload_0:

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

   300                     break;

   301                 case opc_aload_1:

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

   303                     break;

   304                 case opc_iload_1:

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

   306                     break;

   307                 case opc_lload_1:

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

   309                     break;

   310                 case opc_fload_1:

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

   312                     break;

   313                 case opc_dload_1:

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

   315                     break;

   316                 case opc_aload_2:

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

   318                     break;

   319                 case opc_iload_2:

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

   321                     break;

   322                 case opc_lload_2:

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

   324                     break;

   325                 case opc_fload_2:

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

   327                     break;

   328                 case opc_dload_2:

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

   330                     break;

   331                 case opc_aload_3:

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

   333                     break;

   334                 case opc_iload_3:

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

   336                     break;

   337                 case opc_lload_3:

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

   339                     break;

   340                 case opc_fload_3:

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

   342                     break;

   343                 case opc_dload_3:

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

   345                     break;

   346                 case opc_iload: {

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

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

   349                     break;

   350                 }

   351                 case opc_lload: {

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

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

   354                     break;

   355                 }

   356                 case opc_fload: {

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

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

   359                     break;

   360                 }

   361                 case opc_dload: {

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

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

   364                     break;

   365                 }

   366                 case opc_aload: {

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

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

   369                     break;

   370                 }

   371                 case opc_istore: {

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

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

   374                     break;

   375                 }

   376                 case opc_lstore: {

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

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

   379                     break;

   380                 }

   381                 case opc_fstore: {

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

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

   384                     break;

   385                 }

   386                 case opc_dstore: {

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

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

   389                     break;

   390                 }

   391                 case opc_astore: {

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

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

   394                     break;

   395                 }

   396                 case opc_astore_0:

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

   398                     break;

   399                 case opc_istore_0:

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

   401                     break;

   402                 case opc_lstore_0:

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

   404                     break;

   405                 case opc_fstore_0:

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

   407                     break;

   408                 case opc_dstore_0:

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

   410                     break;

   411                 case opc_astore_1:

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

   413                     break;

   414                 case opc_istore_1:

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

   416                     break;

   417                 case opc_lstore_1:

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

   419                     break;

   420                 case opc_fstore_1:

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

   422                     break;

   423                 case opc_dstore_1:

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

   425                     break;

   426                 case opc_astore_2:

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

   428                     break;

   429                 case opc_istore_2:

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

   431                     break;

   432                 case opc_lstore_2:

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

   434                     break;

   435                 case opc_fstore_2:

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

   437                     break;

   438                 case opc_dstore_2:

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

   440                     break;

   441                 case opc_astore_3:

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

   443                     break;

   444                 case opc_istore_3:

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

   446                     break;

   447                 case opc_lstore_3:

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

   449                     break;

   450                 case opc_fstore_3:

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

   452                     break;

   453                 case opc_dstore_3:

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

   455                     break;

   456                 case opc_iadd:

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

   458                     break;

   459                 case opc_ladd:

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

   461                     break;

   462                 case opc_fadd:

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

   464                     break;

   465                 case opc_dadd:

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

   467                     break;

   468                 case opc_isub:

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

   470                     break;

   471                 case opc_lsub:

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

   473                     break;

   474                 case opc_fsub:

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

   476                     break;

   477                 case opc_dsub:

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

   479                     break;

   480                 case opc_imul:

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

   482                     break;

   483                 case opc_lmul:

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

   485                     break;

   486                 case opc_fmul:

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

   488                     break;

   489                 case opc_dmul:

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

   491                     break;

   492                 case opc_idiv:

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

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

   495                     break;

   496                 case opc_ldiv:

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

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

   499                     break;

   500                 case opc_fdiv:

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

   502                     break;

   503                 case opc_ddiv:

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

   505                     break;

   506                 case opc_irem:

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

   508                     break;

   509                 case opc_lrem:

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

   511                     break;

   512                 case opc_frem:

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

   514                     break;

   515                 case opc_drem:

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

   517                     break;

   518                 case opc_iand:

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

   520                     break;

   521                 case opc_land:

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

   523                     break;

   524                 case opc_ior:

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

   526                     break;

   527                 case opc_lor:

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

   529                     break;

   530                 case opc_ixor:

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

   532                     break;

   533                 case opc_lxor:

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

   535                     break;

   536                 case opc_ineg:

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

   538                     break;

   539                 case opc_lneg:

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

   541                     break;

   542                 case opc_fneg:

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

   544                     break;

   545                 case opc_dneg:

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

   547                     break;

   548                 case opc_ishl:

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

   550                     break;

   551                 case opc_lshl:

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

   553                     break;

   554                 case opc_ishr:

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

   556                     break;

   557                 case opc_lshr:

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

   559                     break;

   560                 case opc_iushr:

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

   562                     break;

   563                 case opc_lushr:

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

   565                     break;

   566                 case opc_iinc: {

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

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

   569                     if (incrBy == 1) {

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

   571                     } else {

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

   573                              lmapper.getI(varIndx),

   574                              Integer.toString(incrBy));

   575                     }

   576                     break;

   577                 }

   578                 case opc_return:

   579                     emit(out, "return;");

   580                     break;

   581                 case opc_ireturn:

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

   583                     break;

   584                 case opc_lreturn:

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

   586                     break;

   587                 case opc_freturn:

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

   589                     break;

   590                 case opc_dreturn:

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

   592                     break;

   593                 case opc_areturn:

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

   595                     break;

   596                 case opc_i2l:

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

   598                     break;

   599                 case opc_i2f:

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

   601                     break;

   602                 case opc_i2d:

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

   604                     break;

   605                 case opc_l2i:

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

   607                     break;

   608                     // max int check?

   609                 case opc_l2f:

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

   611                     break;

   612                 case opc_l2d:

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

   614                     break;

   615                 case opc_f2d:

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

   617                     break;

   618                 case opc_d2f:

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

   620                     break;

   621                 case opc_f2i:

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

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

   624                     break;

   625                 case opc_f2l:

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

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

   628                     break;

   629                 case opc_d2i:

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

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

   632                     break;

   633                 case opc_d2l:

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

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

   636                     break;

   637                 case opc_i2b:

   638                 case opc_i2c:

   639                 case opc_i2s:

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

   641                     break;

   642                 case opc_aconst_null:

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

   644                     break;

   645                 case opc_iconst_m1:

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

   647                     break;

   648                 case opc_iconst_0:

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

   650                     break;

   651                 case opc_dconst_0:

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

   653                     break;

   654                 case opc_lconst_0:

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

   656                     break;

   657                 case opc_fconst_0:

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

   659                     break;

   660                 case opc_iconst_1:

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

   662                     break;

   663                 case opc_lconst_1:

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

   665                     break;

   666                 case opc_fconst_1:

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

   668                     break;

   669                 case opc_dconst_1:

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

   671                     break;

   672                 case opc_iconst_2:

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

   674                     break;

   675                 case opc_fconst_2:

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

   677                     break;

   678                 case opc_iconst_3:

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

   680                     break;

   681                 case opc_iconst_4:

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

   683                     break;

   684                 case opc_iconst_5:

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

   686                     break;

   687                 case opc_ldc: {

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

   689                     String v = encodeConstant(indx);

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

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

   692                     break;

   693                 }

   694                 case opc_ldc_w:

   695                 case opc_ldc2_w: {

   696                     int indx = readIntArg(byteCodes, i);

   697                     i += 2;

   698                     String v = encodeConstant(indx);

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

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

   701                     break;

   702                 }

   703                 case opc_lcmp:

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

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

   706                     break;

   707                 case opc_fcmpl:

   708                 case opc_fcmpg:

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

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

   711                     break;

   712                 case opc_dcmpl:

   713                 case opc_dcmpg:

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

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

   716                     break;

   717                 case opc_if_acmpeq:

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

   719                                    "===");

   720                     break;

   721                 case opc_if_acmpne:

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

   723                                    "!=");

   724                     break;

   725                 case opc_if_icmpeq:

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

   727                                    "==");

   728                     break;

   729                 case opc_ifeq: {

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

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

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

   733                     i += 2;

   734                     break;

   735                 }

   736                 case opc_ifne: {

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

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

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

   740                     i += 2;

   741                     break;

   742                 }

   743                 case opc_iflt: {

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

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

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

   747                     i += 2;

   748                     break;

   749                 }

   750                 case opc_ifle: {

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

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

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

   754                     i += 2;

   755                     break;

   756                 }

   757                 case opc_ifgt: {

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

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

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

   761                     i += 2;

   762                     break;

   763                 }

   764                 case opc_ifge: {

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

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

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

   768                     i += 2;

   769                     break;

   770                 }

   771                 case opc_ifnonnull: {

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

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

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

   775                     i += 2;

   776                     break;

   777                 }

   778                 case opc_ifnull: {

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

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

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

   782                     i += 2;

   783                     break;

   784                 }

   785                 case opc_if_icmpne:

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

   787                                    "!=");

   788                     break;

   789                 case opc_if_icmplt:

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

   791                                    "<");

   792                     break;

   793                 case opc_if_icmple:

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

   795                                    "<=");

   796                     break;

   797                 case opc_if_icmpgt:

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

   799                                    ">");

   800                     break;

   801                 case opc_if_icmpge:

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

   803                                    ">=");

   804                     break;

   805                 case opc_goto: {

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

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

   808                     i += 2;

   809                     break;

   810                 }

   811                 case opc_lookupswitch: {

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

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

   814                     table += 4;

   815                     int n = readInt4(byteCodes, table);

   816                     table += 4;

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

   818                     while (n-- > 0) {

   819                         int cnstnt = readInt4(byteCodes, table);

   820                         table += 4;

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

   822                         table += 4;

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

   824                     }

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

   826                     i = table - 1;

   827                     break;

   828                 }

   829                 case opc_tableswitch: {

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

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

   832                     table += 4;

   833                     int low = readInt4(byteCodes, table);

   834                     table += 4;

   835                     int high = readInt4(byteCodes, table);

   836                     table += 4;

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

   838                     while (low <= high) {

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

   840                         table += 4;

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

   842                         low++;

   843                     }

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

   845                     i = table - 1;

   846                     break;

   847                 }

   848                 case opc_invokeinterface: {

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

   850                     break;

   851                 }

   852                 case opc_invokevirtual:

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

   854                     break;

   855                 case opc_invokespecial:

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

   857                     break;

   858                 case opc_invokestatic:

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

   860                     break;

   861                 case opc_new: {

   862                     int indx = readIntArg(byteCodes, i);

   863                     String ci = jc.getClassName(indx);

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

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

   866                     addReference(ci);

   867                     i += 2;

   868                     break;

   869                 }

   870                 case opc_newarray:

   871                     ++i; // skip type of array

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

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

   874                     break;

   875                 case opc_anewarray:

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

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

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

   879                     break;

   880                 case opc_multianewarray: {

   881                     i += 2;

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

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

   884                        .append(").fillNulls();");

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

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

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

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

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

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

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

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

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

   894                             append(";");

   895                     }

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

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

   898                     }

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

   900                     break;

   901                 }

   902                 case opc_arraylength:

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

   904                     break;

   905                 case opc_lastore:

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

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

   908                     break;

   909                 case opc_fastore:

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

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

   912                     break;

   913                 case opc_dastore:

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

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

   916                     break;

   917                 case opc_aastore:

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

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

   920                     break;

   921                 case opc_iastore:

   922                 case opc_bastore:

   923                 case opc_castore:

   924                 case opc_sastore:

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

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

   927                     break;

   928                 case opc_laload:

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

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

   931                     break;

   932                 case opc_faload:

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

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

   935                     break;

   936                 case opc_daload:

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

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

   939                     break;

   940                 case opc_aaload:

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

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

   943                     break;

   944                 case opc_iaload:

   945                 case opc_baload:

   946                 case opc_caload:

   947                 case opc_saload:

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

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

   950                     break;

   951                 case opc_pop:

   952                 case opc_pop2:

   953                     smapper.pop(1);

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

   955                     break;

   956                 case opc_dup: {

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

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

   959                     break;

   960                 }

   961                 case opc_dup2: {

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

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

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

   965                     } else {

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

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

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

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

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

   971                     }

   972                     break;

   973                 }

   974                 case opc_dup_x1: {

   975                     final Variable vi1 = smapper.pop();

   976                     final Variable vi2 = smapper.pop();

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

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

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

   980 

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

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

   983                     break;

   984                 }

   985                 case opc_dup_x2: {

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

   987                         final Variable vi1 = smapper.pop();

   988                         final Variable vi2 = smapper.pop();

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

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

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

   992 

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

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

   995                     } else {

   996                         final Variable vi1 = smapper.pop();

   997                         final Variable vi2 = smapper.pop();

   998                         final Variable vi3 = smapper.pop();

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

  1000                         final Variable vo3 = smapper.pushT(vi3.getType());

  1001                         final Variable vo2 = smapper.pushT(vi2.getType());

  1002                         final Variable vo1 = smapper.pushT(vi1.getType());

  1003 

  1004                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; @7 = @8; }",

  1005                              vo1, vi1, vo2, vi2, vo3, vi3, vo4, vo1);

  1006                     }

  1007                     break;

  1008                 }

  1009                 case opc_bipush:

  1010                     emit(out, "@1 = @2;",

  1011                          smapper.pushI(), Integer.toString(byteCodes[++i]));

  1012                     break;

  1013                 case opc_sipush:

  1014                     emit(out, "@1 = @2;",

  1015                          smapper.pushI(),

  1016                          Integer.toString(readIntArg(byteCodes, i)));

  1017                     i += 2;

  1018                     break;

  1019                 case opc_getfield: {

  1020                     int indx = readIntArg(byteCodes, i);

  1021                     String[] fi = jc.getFieldInfoName(indx);

  1022                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1023                     emit(out, "@2 = @1.fld_@3;",

  1024                          smapper.popA(), smapper.pushT(type), fi[1]);

  1025                     i += 2;

  1026                     break;

  1027                 }

  1028                 case opc_getstatic: {

  1029                     int indx = readIntArg(byteCodes, i);

  1030                     String[] fi = jc.getFieldInfoName(indx);

  1031                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1032                     emit(out, "@1 = @2(false).constructor.@3;",

  1033                          smapper.pushT(type),

  1034                          accessClass(fi[0].replace('/', '_')), fi[1]);

  1035                     i += 2;

  1036                     addReference(fi[0]);

  1037                     break;

  1038                 }

  1039                 case opc_putfield: {

  1040                     int indx = readIntArg(byteCodes, i);

  1041                     String[] fi = jc.getFieldInfoName(indx);

  1042                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1043                     emit(out, "@2.fld_@3 = @1;",

  1044                          smapper.popT(type), smapper.popA(), fi[1]);

  1045                     i += 2;

  1046                     break;

  1047                 }

  1048                 case opc_putstatic: {

  1049                     int indx = readIntArg(byteCodes, i);

  1050                     String[] fi = jc.getFieldInfoName(indx);

  1051                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1052                     emit(out, "@1(false).constructor.@2 = @3;",

  1053                          accessClass(fi[0].replace('/', '_')), fi[1],

  1054                          smapper.popT(type));

  1055                     i += 2;

  1056                     addReference(fi[0]);

  1057                     break;

  1058                 }

  1059                 case opc_checkcast: {

  1060                     int indx = readIntArg(byteCodes, i);

  1061                     final String type = jc.getClassName(indx);

  1062                     if (!type.startsWith("[")) {

  1063                         // no way to check arrays right now

  1064                         // XXX proper exception

  1065                         emit(out,

  1066                              "if (@1 !== null && !@1.$instOf_@2) throw {};",

  1067                              smapper.getA(0), type.replace('/', '_'));

  1068                     }

  1069                     i += 2;

  1070                     break;

  1071                 }

  1072                 case opc_instanceof: {

  1073                     int indx = readIntArg(byteCodes, i);

  1074                     final String type = jc.getClassName(indx);

  1075                     emit(out, "@2 = @1.$instOf_@3 ? 1 : 0;",

  1076                          smapper.popA(), smapper.pushI(),

  1077                          type.replace('/', '_'));

  1078                     i += 2;

  1079                     break;

  1080                 }

  1081                 case opc_athrow: {

  1082                     final Variable v = smapper.popA();

  1083                     smapper.clear();

  1084 

  1085                     emit(out, "{ @1 = @2; throw @2; }",

  1086                          smapper.pushA(), v);

  1087                     break;

  1088                 }

  1089 

  1090                 case opc_monitorenter: {

  1091                     out.append("/* monitor enter */");

  1092                     smapper.popA();

  1093                     break;

  1094                 }

  1095 

  1096                 case opc_monitorexit: {

  1097                     out.append("/* monitor exit */");

  1098                     smapper.popA();

  1099                     break;

  1100                 }

  1101 

  1102                 default: {

  1103                     emit(out, "throw 'unknown bytecode @1';",

  1104                          Integer.toString(c));

  1105                 }

  1106             }

  1107             out.append(" //");

  1108             for (int j = prev; j <= i; j++) {

  1109                 out.append(" ");

  1110                 final int cc = readByte(byteCodes, j);

  1111                 out.append(Integer.toString(cc));

  1112             }

  1113             out.append("\n");

  1114         }

  1115         out.append("  }\n");

  1116         out.append("};");

  1117     }

  1118 

  1119     private int generateIf(byte[] byteCodes, int i,

  1120                            final Variable v2, final Variable v1,

  1121                            final String test) throws IOException {

  1122         int indx = i + readIntArg(byteCodes, i);

  1123         out.append("if (").append(v1)

  1124            .append(' ').append(test).append(' ')

  1125            .append(v2).append(") { gt = " + indx)

  1126            .append("; continue; }");

  1127         return i + 2;

  1128     }

  1129 

  1130     private int readIntArg(byte[] byteCodes, int offsetInstruction) {

  1131         final int indxHi = byteCodes[offsetInstruction + 1] << 8;

  1132         final int indxLo = byteCodes[offsetInstruction + 2];

  1133         return (indxHi & 0xffffff00) | (indxLo & 0xff);

  1134     }

  1135     private int readInt4(byte[] byteCodes, int offsetInstruction) {

  1136         final int d = byteCodes[offsetInstruction + 0] << 24;

  1137         final int c = byteCodes[offsetInstruction + 1] << 16;

  1138         final int b = byteCodes[offsetInstruction + 2] << 8;

  1139         final int a = byteCodes[offsetInstruction + 3];

  1140         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

  1141     }

  1142     private int readByte(byte[] byteCodes, int offsetInstruction) {

  1143         return byteCodes[offsetInstruction] & 0xff;

  1144     }

  1145     

  1146     private static void countArgs(String descriptor, char[] returnType, StringBuilder sig, StringBuilder cnt) {

  1147         int i = 0;

  1148         Boolean count = null;

  1149         boolean array = false;

  1150         sig.append("__");

  1151         int firstPos = sig.length();

  1152         while (i < descriptor.length()) {

  1153             char ch = descriptor.charAt(i++);

  1154             switch (ch) {

  1155                 case '(':

  1156                     count = true;

  1157                     continue;

  1158                 case ')':

  1159                     count = false;

  1160                     continue;

  1161                 case 'B': 

  1162                 case 'C': 

  1163                 case 'D': 

  1164                 case 'F': 

  1165                 case 'I': 

  1166                 case 'J': 

  1167                 case 'S': 

  1168                 case 'Z': 

  1169                     if (count) {

  1170                         if (array) {

  1171                             sig.append("_3");

  1172                         }

  1173                         sig.append(ch);

  1174                         if (ch == 'J' || ch == 'D') {

  1175                             cnt.append('1');

  1176                         } else {

  1177                             cnt.append('0');

  1178                         }

  1179                     } else {

  1180                         sig.insert(firstPos, ch);

  1181                         if (array) {

  1182                             returnType[0] = '[';

  1183                             sig.insert(firstPos, "_3");

  1184                         } else {

  1185                             returnType[0] = ch;

  1186                         }

  1187                     }

  1188                     array = false;

  1189                     continue;

  1190                 case 'V': 

  1191                     assert !count;

  1192                     returnType[0] = 'V';

  1193                     sig.insert(firstPos, 'V');

  1194                     continue;

  1195                 case 'L':

  1196                     int next = descriptor.indexOf(';', i);

  1197                     String realSig = mangleSig(descriptor, i - 1, next + 1);

  1198                     if (count) {

  1199                         if (array) {

  1200                             sig.append("_3");

  1201                         }

  1202                         sig.append(realSig);

  1203                         cnt.append('0');

  1204                     } else {

  1205                         sig.insert(firstPos, realSig);

  1206                         if (array) {

  1207                             sig.insert(firstPos, "_3");

  1208                         }

  1209                         returnType[0] = 'L';

  1210                     }

  1211                     i = next + 1;

  1212                     continue;

  1213                 case '[':

  1214                     array = true;

  1215                     continue;

  1216                 default:

  1217                     throw new IllegalStateException("Invalid char: " + ch);

  1218             }

  1219         }

  1220     }

  1221     

  1222     private static String mangleSig(String txt, int first, int last) {

  1223         StringBuilder sb = new StringBuilder();

  1224         for (int i = first; i < last; i++) {

  1225             final char ch = txt.charAt(i);

  1226             switch (ch) {

  1227                 case '/': sb.append('_'); break;

  1228                 case '_': sb.append("_1"); break;

  1229                 case ';': sb.append("_2"); break;

  1230                 case '[': sb.append("_3"); break;

  1231                 default: sb.append(ch); break;

  1232             }

  1233         }

  1234         return sb.toString();

  1235     }

  1236 

  1237     private static String findMethodName(MethodData m, StringBuilder cnt) {

  1238         StringBuilder name = new StringBuilder();

  1239         if ("<init>".equals(m.getName())) { // NOI18N

  1240             name.append("cons"); // NOI18N

  1241         } else if ("<clinit>".equals(m.getName())) { // NOI18N

  1242             name.append("class"); // NOI18N

  1243         } else {

  1244             name.append(m.getName());

  1245         } 

  1246         

  1247         countArgs(m.getInternalSig(), new char[1], name, cnt);

  1248         return name.toString();

  1249     }

  1250 

  1251     static String findMethodName(String[] mi, StringBuilder cnt, char[] returnType) {

  1252         StringBuilder name = new StringBuilder();

  1253         String descr = mi[2];//mi.getDescriptor();

  1254         String nm= mi[1];

  1255         if ("<init>".equals(nm)) { // NOI18N

  1256             name.append("cons"); // NOI18N

  1257         } else {

  1258             name.append(nm);

  1259         }

  1260         countArgs(descr, returnType, name, cnt);

  1261         return name.toString();

  1262     }

  1263 

  1264     private int invokeStaticMethod(byte[] byteCodes, int i, final StackMapper mapper, boolean isStatic)

  1265     throws IOException {

  1266         int methodIndex = readIntArg(byteCodes, i);

  1267         String[] mi = jc.getFieldInfoName(methodIndex);

  1268         char[] returnType = { 'V' };

  1269         StringBuilder cnt = new StringBuilder();

  1270         String mn = findMethodName(mi, cnt, returnType);

  1271 

  1272         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1273         final Variable[] vars = new Variable[numArguments];

  1274 

  1275         for (int j = numArguments - 1; j >= 0; --j) {

  1276             vars[j] = mapper.pop();

  1277         }

  1278 

  1279         if (returnType[0] != 'V') {

  1280             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1281                .append(" = ");

  1282         }

  1283 

  1284         final String in = mi[0];

  1285         out.append(accessClass(in.replace('/', '_')));

  1286         out.append("(false).");

  1287         out.append(mn);

  1288         out.append('(');

  1289         if (numArguments > 0) {

  1290             out.append(vars[0]);

  1291             for (int j = 1; j < numArguments; ++j) {

  1292                 out.append(", ");

  1293                 out.append(vars[j]);

  1294             }

  1295         }

  1296         out.append(");");

  1297         i += 2;

  1298         addReference(in);

  1299         return i;

  1300     }

  1301     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackMapper mapper)

  1302     throws IOException {

  1303         int methodIndex = readIntArg(byteCodes, i);

  1304         String[] mi = jc.getFieldInfoName(methodIndex);

  1305         char[] returnType = { 'V' };

  1306         StringBuilder cnt = new StringBuilder();

  1307         String mn = findMethodName(mi, cnt, returnType);

  1308 

  1309         final int numArguments = cnt.length() + 1;

  1310         final Variable[] vars = new Variable[numArguments];

  1311 

  1312         for (int j = numArguments - 1; j >= 0; --j) {

  1313             vars[j] = mapper.pop();

  1314         }

  1315 

  1316         if (returnType[0] != 'V') {

  1317             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1318                .append(" = ");

  1319         }

  1320 

  1321         out.append(vars[0]).append('.');

  1322         out.append(mn);

  1323         out.append('(');

  1324         out.append(vars[0]);

  1325         for (int j = 1; j < numArguments; ++j) {

  1326             out.append(", ");

  1327             out.append(vars[j]);

  1328         }

  1329         out.append(");");

  1330         i += 2;

  1331         return i;

  1332     }

  1333 

  1334     private void addReference(String cn) throws IOException {

  1335         if (requireReference(cn)) {

  1336             out.append(" /* needs ").append(cn).append(" */");

  1337         }

  1338     }

  1339 

  1340     private void outType(String d, StringBuilder out) {

  1341         int arr = 0;

  1342         while (d.charAt(0) == '[') {

  1343             out.append('A');

  1344             d = d.substring(1);

  1345         }

  1346         if (d.charAt(0) == 'L') {

  1347             assert d.charAt(d.length() - 1) == ';';

  1348             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1349         } else {

  1350             out.append(d);

  1351         }

  1352     }

  1353 

  1354     private String encodeConstant(int entryIndex) throws IOException {

  1355         String[] classRef = { null };

  1356         String s = jc.stringValue(entryIndex, classRef);

  1357         if (classRef[0] != null) {

  1358             addReference(classRef[0]);

  1359             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1360         }

  1361         return s;

  1362     }

  1363 

  1364     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1365         byte[] arr = m.findAnnotationData(true);

  1366         if (arr == null) {

  1367             return null;

  1368         }

  1369         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1370         class P extends AnnotationParser {

  1371             public P() {

  1372                 super(false);

  1373             }

  1374             

  1375             int cnt;

  1376             String[] args = new String[30];

  1377             String body;

  1378             

  1379             @Override

  1380             protected void visitAttr(String type, String attr, String at, String value) {

  1381                 if (type.equals(jvmType)) {

  1382                     if ("body".equals(attr)) {

  1383                         body = value;

  1384                     } else if ("args".equals(attr)) {

  1385                         args[cnt++] = value;

  1386                     } else {

  1387                         throw new IllegalArgumentException(attr);

  1388                     }

  1389                 }

  1390             }

  1391         }

  1392         P p = new P();

  1393         p.parse(arr, jc);

  1394         if (p.body == null) {

  1395             return null;

  1396         }

  1397         StringBuilder cnt = new StringBuilder();

  1398         final String mn = findMethodName(m, cnt);

  1399         out.append(prefix).append(mn);

  1400         out.append(" = function(");

  1401         String space;

  1402         int index;

  1403         if (!isStatic) {                

  1404             space = outputArg(out, p.args, 0);

  1405             index = 1;

  1406         } else {

  1407             space = "";

  1408             index = 0;

  1409         }

  1410         for (int i = 0; i < cnt.length(); i++) {

  1411             out.append(space);

  1412             space = outputArg(out, p.args, index);

  1413             index++;

  1414         }

  1415         out.append(") {").append("\n");

  1416         out.append(p.body);

  1417         out.append("\n}\n");

  1418         return mn;

  1419     }

  1420     private static String className(ClassData jc) {

  1421         //return jc.getName().getInternalName().replace('/', '_');

  1422         return jc.getClassName().replace('/', '_');

  1423     }

  1424     

  1425     private static String[] findAnnotation(

  1426         byte[] arr, ClassData cd, final String className, 

  1427         final String... attrNames

  1428     ) throws IOException {

  1429         if (arr == null) {

  1430             return null;

  1431         }

  1432         final String[] values = new String[attrNames.length];

  1433         final boolean[] found = { false };

  1434         final String jvmType = "L" + className.replace('.', '/') + ";";

  1435         AnnotationParser ap = new AnnotationParser(false) {

  1436             @Override

  1437             protected void visitAttr(String type, String attr, String at, String value) {

  1438                 if (type.equals(jvmType)) {

  1439                     found[0] = true;

  1440                     for (int i = 0; i < attrNames.length; i++) {

  1441                         if (attrNames[i].equals(attr)) {

  1442                             values[i] = value;

  1443                         }

  1444                     }

  1445                 }

  1446             }

  1447             

  1448         };

  1449         ap.parse(arr, cd);

  1450         return found[0] ? values : null;

  1451     }

  1452 

  1453     private CharSequence initField(FieldData v) {

  1454         final String is = v.getInternalSig();

  1455         if (is.length() == 1) {

  1456             switch (is.charAt(0)) {

  1457                 case 'S':

  1458                 case 'J':

  1459                 case 'B':

  1460                 case 'Z':

  1461                 case 'C':

  1462                 case 'I': return " = 0;";

  1463                 case 'F': 

  1464                 case 'D': return " = 0.0;";

  1465                 default:

  1466                     throw new IllegalStateException(is);

  1467             }

  1468         }

  1469         return " = null;";

  1470     }

  1471 

  1472     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1473         AnnotationParser ap = new AnnotationParser(true) {

  1474             int anno;

  1475             int cnt;

  1476             

  1477             @Override

  1478             protected void visitAnnotationStart(String type) throws IOException {

  1479                 if (anno++ > 0) {

  1480                     out.append(",");

  1481                 }

  1482                 out.append('"').append(type).append("\" : {\n");

  1483                 cnt = 0;

  1484             }

  1485 

  1486             @Override

  1487             protected void visitAnnotationEnd(String type) throws IOException {

  1488                 out.append("\n}\n");

  1489             }

  1490             

  1491             @Override

  1492             protected void visitAttr(String type, String attr, String attrType, String value) 

  1493             throws IOException {

  1494                 if (attr == null) {

  1495                     return;

  1496                 }

  1497                 if (cnt++ > 0) {

  1498                     out.append(",\n");

  1499                 }

  1500                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1501             }

  1502         };

  1503         ap.parse(data, cd);

  1504     }

  1505 

  1506     private static String outputArg(Appendable out, String[] args, int indx) throws IOException {

  1507         final String name = args[indx];

  1508         if (name == null) {

  1509             return "";

  1510         }

  1511         if (name.contains(",")) {

  1512             throw new IOException("Wrong parameter with ',': " + name);

  1513         }

  1514         out.append(name);

  1515         return ",";

  1516     }

  1517 

  1518     private static void emit(final Appendable out,

  1519                              final String format,

  1520                              final CharSequence... params) throws IOException {

  1521         final int length = format.length();

  1522 

  1523         int processed = 0;

  1524         int paramOffset = format.indexOf('@');

  1525         while ((paramOffset != -1) && (paramOffset < (length - 1))) {

  1526             final char paramChar = format.charAt(paramOffset + 1);

  1527             if ((paramChar >= '1') && (paramChar <= '9')) {

  1528                 final int paramIndex = paramChar - '0' - 1;

  1529 

  1530                 out.append(format, processed, paramOffset);

  1531                 out.append(params[paramIndex]);

  1532 

  1533                 ++paramOffset;

  1534                 processed = paramOffset + 1;

  1535             }

  1536 

  1537             paramOffset = format.indexOf('@', paramOffset + 1);

  1538         }

  1539 

  1540         out.append(format, processed, length);

  1541     }

  1542 }
hg/bck2brwsr