Mercurialhg/bck2brwsr / file revision
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | raw | help
vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
Mon, 24 Dec 2012 08:19:55 +0100
branchexceptions
changeset 376 059cb07ac9b3
parent 358 f6a165f7f00f
parent 292 fc3f6ea5e246
child 392 44a5802816be
child 407 b2f68438b0e2
permissions -rw-r--r--
Initial attempt to merge current default branch with exceptions 
     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 mn;

   139             if (m.isStatic()) {

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

   141             } else {

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

   143             }

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

   145             if (runAnno != null) {

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

   147                 generateAnno(jc, out, runAnno);

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

   149             }

   150         }

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

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

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

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

   155         }

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

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

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

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

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

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

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

   163         if (classAnno != null) {

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

   165             generateAnno(jc, out, classAnno);

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

   167         }

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

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

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

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

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

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

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

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

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

   177                 "name", "value"

   178             );

   179             if (only != null) {

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

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

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

   183                 }

   184                 continue;

   185             }

   186             if (!v.isStatic()) {

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

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

   189             }

   190         }

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

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

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

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

   195         StringBuilder sb = new StringBuilder();

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

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

   198         }

   199         return sb.toString();

   200     }

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

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

   203         if (jsb != null) {

   204             return jsb;

   205         }

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

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

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

   209         }

   210         generateMethod(prefix, mn, m);

   211         return mn;

   212     }

   213 

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

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

   216         if (jsb != null) {

   217             return jsb;

   218         }

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

   220         generateMethod(prefix, mn, m);

   221         return mn;

   222     }

   223 

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

   225             throws IOException {

   226         final StackMapIterator stackMapIterator = m.createStackMapIterator();

   227         TrapDataIterator trap = m.getTrapDataIterator();

   228         final LocalsMapper lmapper =

   229                 new LocalsMapper(stackMapIterator.getArguments());

   230 

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

   232         lmapper.outputArguments(out);

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

   234 

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

   236         if (byteCodes == null) {

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

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

   239             out.append("};");

   240             return;

   241         }

   242 

   243         final StackMapper smapper = new StackMapper();

   244 

   245         final int maxLocals = m.getMaxLocals();

   246         if (maxLocals > 0) {

   247             // TODO: generate only used local variables

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

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

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

   251                     out.append(", ");

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

   253                 }

   254                 out.append(';');

   255             }

   256         }

   257 

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

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

   260         final int maxStack = m.getMaxStack();

   261         if (maxStack > 0) {

   262             // TODO: generate only used stack variables

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

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

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

   266                     out.append(", ");

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

   268                 }

   269                 out.append(';');

   270             }

   271         }

   272 

   273         int lastStackFrame = -1;

   274 

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

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

   277             int prev = i;

   278             stackMapIterator.advanceTo(i);

   279             trap.advanceTo(i);

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

   281                 lastStackFrame = stackMapIterator.getFrameIndex();

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

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

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

   285             } else {

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

   287             }

   288             if (trap.useTry()) {

   289                 out.append("try {");

   290             }

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

   292             switch (c) {

   293                 case opc_aload_0:

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

   295                     break;

   296                 case opc_iload_0:

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

   298                     break;

   299                 case opc_lload_0:

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

   301                     break;

   302                 case opc_fload_0:

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

   304                     break;

   305                 case opc_dload_0:

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

   307                     break;

   308                 case opc_aload_1:

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

   310                     break;

   311                 case opc_iload_1:

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

   313                     break;

   314                 case opc_lload_1:

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

   316                     break;

   317                 case opc_fload_1:

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

   319                     break;

   320                 case opc_dload_1:

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

   322                     break;

   323                 case opc_aload_2:

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

   325                     break;

   326                 case opc_iload_2:

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

   328                     break;

   329                 case opc_lload_2:

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

   331                     break;

   332                 case opc_fload_2:

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

   334                     break;

   335                 case opc_dload_2:

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

   337                     break;

   338                 case opc_aload_3:

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

   340                     break;

   341                 case opc_iload_3:

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

   343                     break;

   344                 case opc_lload_3:

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

   346                     break;

   347                 case opc_fload_3:

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

   349                     break;

   350                 case opc_dload_3:

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

   352                     break;

   353                 case opc_iload: {

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

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

   356                     break;

   357                 }

   358                 case opc_lload: {

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

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

   361                     break;

   362                 }

   363                 case opc_fload: {

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

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

   366                     break;

   367                 }

   368                 case opc_dload: {

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

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

   371                     break;

   372                 }

   373                 case opc_aload: {

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

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

   376                     break;

   377                 }

   378                 case opc_istore: {

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

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

   381                     break;

   382                 }

   383                 case opc_lstore: {

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

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

   386                     break;

   387                 }

   388                 case opc_fstore: {

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

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

   391                     break;

   392                 }

   393                 case opc_dstore: {

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

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

   396                     break;

   397                 }

   398                 case opc_astore: {

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

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

   401                     break;

   402                 }

   403                 case opc_astore_0:

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

   405                     break;

   406                 case opc_istore_0:

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

   408                     break;

   409                 case opc_lstore_0:

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

   411                     break;

   412                 case opc_fstore_0:

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

   414                     break;

   415                 case opc_dstore_0:

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

   417                     break;

   418                 case opc_astore_1:

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

   420                     break;

   421                 case opc_istore_1:

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

   423                     break;

   424                 case opc_lstore_1:

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

   426                     break;

   427                 case opc_fstore_1:

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

   429                     break;

   430                 case opc_dstore_1:

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

   432                     break;

   433                 case opc_astore_2:

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

   435                     break;

   436                 case opc_istore_2:

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

   438                     break;

   439                 case opc_lstore_2:

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

   441                     break;

   442                 case opc_fstore_2:

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

   444                     break;

   445                 case opc_dstore_2:

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

   447                     break;

   448                 case opc_astore_3:

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

   450                     break;

   451                 case opc_istore_3:

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

   453                     break;

   454                 case opc_lstore_3:

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

   456                     break;

   457                 case opc_fstore_3:

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

   459                     break;

   460                 case opc_dstore_3:

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

   462                     break;

   463                 case opc_iadd:

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

   465                     break;

   466                 case opc_ladd:

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

   468                     break;

   469                 case opc_fadd:

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

   471                     break;

   472                 case opc_dadd:

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

   474                     break;

   475                 case opc_isub:

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

   477                     break;

   478                 case opc_lsub:

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

   480                     break;

   481                 case opc_fsub:

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

   483                     break;

   484                 case opc_dsub:

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

   486                     break;

   487                 case opc_imul:

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

   489                     break;

   490                 case opc_lmul:

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

   492                     break;

   493                 case opc_fmul:

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

   495                     break;

   496                 case opc_dmul:

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

   498                     break;

   499                 case opc_idiv:

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

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

   502                     break;

   503                 case opc_ldiv:

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

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

   506                     break;

   507                 case opc_fdiv:

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

   509                     break;

   510                 case opc_ddiv:

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

   512                     break;

   513                 case opc_irem:

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

   515                     break;

   516                 case opc_lrem:

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

   518                     break;

   519                 case opc_frem:

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

   521                     break;

   522                 case opc_drem:

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

   524                     break;

   525                 case opc_iand:

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

   527                     break;

   528                 case opc_land:

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

   530                     break;

   531                 case opc_ior:

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

   533                     break;

   534                 case opc_lor:

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

   536                     break;

   537                 case opc_ixor:

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

   539                     break;

   540                 case opc_lxor:

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

   542                     break;

   543                 case opc_ineg:

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

   545                     break;

   546                 case opc_lneg:

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

   548                     break;

   549                 case opc_fneg:

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

   551                     break;

   552                 case opc_dneg:

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

   554                     break;

   555                 case opc_ishl:

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

   557                     break;

   558                 case opc_lshl:

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

   560                     break;

   561                 case opc_ishr:

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

   563                     break;

   564                 case opc_lshr:

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

   566                     break;

   567                 case opc_iushr:

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

   569                     break;

   570                 case opc_lushr:

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

   572                     break;

   573                 case opc_iinc: {

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

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

   576                     if (incrBy == 1) {

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

   578                     } else {

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

   580                              lmapper.getI(varIndx),

   581                              Integer.toString(incrBy));

   582                     }

   583                     break;

   584                 }

   585                 case opc_return:

   586                     emit(out, "return;");

   587                     break;

   588                 case opc_ireturn:

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

   590                     break;

   591                 case opc_lreturn:

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

   593                     break;

   594                 case opc_freturn:

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

   596                     break;

   597                 case opc_dreturn:

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

   599                     break;

   600                 case opc_areturn:

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

   602                     break;

   603                 case opc_i2l:

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

   605                     break;

   606                 case opc_i2f:

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

   608                     break;

   609                 case opc_i2d:

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

   611                     break;

   612                 case opc_l2i:

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

   614                     break;

   615                     // max int check?

   616                 case opc_l2f:

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

   618                     break;

   619                 case opc_l2d:

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

   621                     break;

   622                 case opc_f2d:

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

   624                     break;

   625                 case opc_d2f:

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

   627                     break;

   628                 case opc_f2i:

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

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

   631                     break;

   632                 case opc_f2l:

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

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

   635                     break;

   636                 case opc_d2i:

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

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

   639                     break;

   640                 case opc_d2l:

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

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

   643                     break;

   644                 case opc_i2b:

   645                 case opc_i2c:

   646                 case opc_i2s:

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

   648                     break;

   649                 case opc_aconst_null:

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

   651                     break;

   652                 case opc_iconst_m1:

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

   654                     break;

   655                 case opc_iconst_0:

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

   657                     break;

   658                 case opc_dconst_0:

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

   660                     break;

   661                 case opc_lconst_0:

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

   663                     break;

   664                 case opc_fconst_0:

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

   666                     break;

   667                 case opc_iconst_1:

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

   669                     break;

   670                 case opc_lconst_1:

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

   672                     break;

   673                 case opc_fconst_1:

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

   675                     break;

   676                 case opc_dconst_1:

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

   678                     break;

   679                 case opc_iconst_2:

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

   681                     break;

   682                 case opc_fconst_2:

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

   684                     break;

   685                 case opc_iconst_3:

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

   687                     break;

   688                 case opc_iconst_4:

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

   690                     break;

   691                 case opc_iconst_5:

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

   693                     break;

   694                 case opc_ldc: {

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

   696                     String v = encodeConstant(indx);

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

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

   699                     break;

   700                 }

   701                 case opc_ldc_w:

   702                 case opc_ldc2_w: {

   703                     int indx = readIntArg(byteCodes, i);

   704                     i += 2;

   705                     String v = encodeConstant(indx);

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

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

   708                     break;

   709                 }

   710                 case opc_lcmp:

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

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

   713                     break;

   714                 case opc_fcmpl:

   715                 case opc_fcmpg:

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

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

   718                     break;

   719                 case opc_dcmpl:

   720                 case opc_dcmpg:

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

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

   723                     break;

   724                 case opc_if_acmpeq:

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

   726                                    "===");

   727                     break;

   728                 case opc_if_acmpne:

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

   730                                    "!=");

   731                     break;

   732                 case opc_if_icmpeq:

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

   734                                    "==");

   735                     break;

   736                 case opc_ifeq: {

   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_ifne: {

   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_iflt: {

   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_ifle: {

   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_ifgt: {

   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_ifge: {

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

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

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

   775                     i += 2;

   776                     break;

   777                 }

   778                 case opc_ifnonnull: {

   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_ifnull: {

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

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

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

   789                     i += 2;

   790                     break;

   791                 }

   792                 case opc_if_icmpne:

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

   794                                    "!=");

   795                     break;

   796                 case opc_if_icmplt:

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

   798                                    "<");

   799                     break;

   800                 case opc_if_icmple:

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

   802                                    "<=");

   803                     break;

   804                 case opc_if_icmpgt:

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

   806                                    ">");

   807                     break;

   808                 case opc_if_icmpge:

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

   810                                    ">=");

   811                     break;

   812                 case opc_goto: {

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

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

   815                     i += 2;

   816                     break;

   817                 }

   818                 case opc_lookupswitch: {

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

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

   821                     table += 4;

   822                     int n = readInt4(byteCodes, table);

   823                     table += 4;

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

   825                     while (n-- > 0) {

   826                         int cnstnt = readInt4(byteCodes, table);

   827                         table += 4;

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

   829                         table += 4;

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

   831                     }

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

   833                     i = table - 1;

   834                     break;

   835                 }

   836                 case opc_tableswitch: {

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

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

   839                     table += 4;

   840                     int low = readInt4(byteCodes, table);

   841                     table += 4;

   842                     int high = readInt4(byteCodes, table);

   843                     table += 4;

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

   845                     while (low <= high) {

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

   847                         table += 4;

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

   849                         low++;

   850                     }

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

   852                     i = table - 1;

   853                     break;

   854                 }

   855                 case opc_invokeinterface: {

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

   857                     break;

   858                 }

   859                 case opc_invokevirtual:

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

   861                     break;

   862                 case opc_invokespecial:

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

   864                     break;

   865                 case opc_invokestatic:

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

   867                     break;

   868                 case opc_new: {

   869                     int indx = readIntArg(byteCodes, i);

   870                     String ci = jc.getClassName(indx);

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

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

   873                     addReference(ci);

   874                     i += 2;

   875                     break;

   876                 }

   877                 case opc_newarray:

   878                     ++i; // skip type of array

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

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

   881                     break;

   882                 case opc_anewarray:

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

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

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

   886                     break;

   887                 case opc_multianewarray: {

   888                     i += 2;

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

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

   891                        .append(").fillNulls();");

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

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

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

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

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

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

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

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

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

   901                             append(";");

   902                     }

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

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

   905                     }

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

   907                     break;

   908                 }

   909                 case opc_arraylength:

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

   911                     break;

   912                 case opc_lastore:

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

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

   915                     break;

   916                 case opc_fastore:

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

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

   919                     break;

   920                 case opc_dastore:

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

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

   923                     break;

   924                 case opc_aastore:

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

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

   927                     break;

   928                 case opc_iastore:

   929                 case opc_bastore:

   930                 case opc_castore:

   931                 case opc_sastore:

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

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

   934                     break;

   935                 case opc_laload:

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

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

   938                     break;

   939                 case opc_faload:

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

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

   942                     break;

   943                 case opc_daload:

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

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

   946                     break;

   947                 case opc_aaload:

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

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

   950                     break;

   951                 case opc_iaload:

   952                 case opc_baload:

   953                 case opc_caload:

   954                 case opc_saload:

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

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

   957                     break;

   958                 case opc_pop:

   959                 case opc_pop2:

   960                     smapper.pop(1);

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

   962                     break;

   963                 case opc_dup: {

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

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

   966                     break;

   967                 }

   968                 case opc_dup2: {

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

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

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

   972                     } else {

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

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

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

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

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

   978                     }

   979                     break;

   980                 }

   981                 case opc_dup_x1: {

   982                     final Variable vi1 = smapper.pop();

   983                     final Variable vi2 = smapper.pop();

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

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

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

   987 

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

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

   990                     break;

   991                 }

   992                 case opc_dup_x2: {

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

   994                         final Variable vi1 = smapper.pop();

   995                         final Variable vi2 = smapper.pop();

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

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

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

   999 

  1000                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; }",

  1001                              vo1, vi1, vo2, vi2, vo3, vo1);

  1002                     } else {

  1003                         final Variable vi1 = smapper.pop();

  1004                         final Variable vi2 = smapper.pop();

  1005                         final Variable vi3 = smapper.pop();

  1006                         final Variable vo4 = smapper.pushT(vi1.getType());

  1007                         final Variable vo3 = smapper.pushT(vi3.getType());

  1008                         final Variable vo2 = smapper.pushT(vi2.getType());

  1009                         final Variable vo1 = smapper.pushT(vi1.getType());

  1010 

  1011                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; @7 = @8; }",

  1012                              vo1, vi1, vo2, vi2, vo3, vi3, vo4, vo1);

  1013                     }

  1014                     break;

  1015                 }

  1016                 case opc_bipush:

  1017                     emit(out, "@1 = @2;",

  1018                          smapper.pushI(), Integer.toString(byteCodes[++i]));

  1019                     break;

  1020                 case opc_sipush:

  1021                     emit(out, "@1 = @2;",

  1022                          smapper.pushI(),

  1023                          Integer.toString(readIntArg(byteCodes, i)));

  1024                     i += 2;

  1025                     break;

  1026                 case opc_getfield: {

  1027                     int indx = readIntArg(byteCodes, i);

  1028                     String[] fi = jc.getFieldInfoName(indx);

  1029                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1030                     emit(out, "@2 = @1.fld_@3;",

  1031                          smapper.popA(), smapper.pushT(type), fi[1]);

  1032                     i += 2;

  1033                     break;

  1034                 }

  1035                 case opc_getstatic: {

  1036                     int indx = readIntArg(byteCodes, i);

  1037                     String[] fi = jc.getFieldInfoName(indx);

  1038                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1039                     emit(out, "@1 = @2(false).constructor.@3;",

  1040                          smapper.pushT(type),

  1041                          accessClass(fi[0].replace('/', '_')), fi[1]);

  1042                     i += 2;

  1043                     addReference(fi[0]);

  1044                     break;

  1045                 }

  1046                 case opc_putfield: {

  1047                     int indx = readIntArg(byteCodes, i);

  1048                     String[] fi = jc.getFieldInfoName(indx);

  1049                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1050                     emit(out, "@2.fld_@3 = @1;",

  1051                          smapper.popT(type), smapper.popA(), fi[1]);

  1052                     i += 2;

  1053                     break;

  1054                 }

  1055                 case opc_putstatic: {

  1056                     int indx = readIntArg(byteCodes, i);

  1057                     String[] fi = jc.getFieldInfoName(indx);

  1058                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1059                     emit(out, "@1(false).constructor.@2 = @3;",

  1060                          accessClass(fi[0].replace('/', '_')), fi[1],

  1061                          smapper.popT(type));

  1062                     i += 2;

  1063                     addReference(fi[0]);

  1064                     break;

  1065                 }

  1066                 case opc_checkcast: {

  1067                     int indx = readIntArg(byteCodes, i);

  1068                     final String type = jc.getClassName(indx);

  1069                     if (!type.startsWith("[")) {

  1070                         // no way to check arrays right now

  1071                         // XXX proper exception

  1072                         emit(out,

  1073                              "if (@1 !== null && !@1.$instOf_@2) throw {};",

  1074                              smapper.getA(0), type.replace('/', '_'));

  1075                     }

  1076                     i += 2;

  1077                     break;

  1078                 }

  1079                 case opc_instanceof: {

  1080                     int indx = readIntArg(byteCodes, i);

  1081                     final String type = jc.getClassName(indx);

  1082                     emit(out, "@2 = @1.$instOf_@3 ? 1 : 0;",

  1083                          smapper.popA(), smapper.pushI(),

  1084                          type.replace('/', '_'));

  1085                     i += 2;

  1086                     break;

  1087                 }

  1088                 case opc_athrow: {

  1089                     final Variable v = smapper.popA();

  1090                     smapper.clear();

  1091 

  1092                     emit(out, "{ @1 = @2; throw @2; }",

  1093                          smapper.pushA(), v);

  1094                     break;

  1095                 }

  1096 

  1097                 case opc_monitorenter: {

  1098                     out.append("/* monitor enter */");

  1099                     smapper.popA();

  1100                     break;

  1101                 }

  1102 

  1103                 case opc_monitorexit: {

  1104                     out.append("/* monitor exit */");

  1105                     smapper.popA();

  1106                     break;

  1107                 }

  1108 

  1109                 default: {

  1110                     emit(out, "throw 'unknown bytecode @1';",

  1111                          Integer.toString(c));

  1112                 }

  1113             }

  1114             if (trap.useTry()) {

  1115                 out.append("} catch (e) {");

  1116                 for (TrapData e : trap.current()) {

  1117                     if (e == null) {

  1118                         break;

  1119                     }

  1120                     if (e.catch_cpx != 0) { //not finally

  1121                         final String classInternalName = jc.getClassName(e.catch_cpx);

  1122                         addReference(classInternalName);

  1123                         out.append("if (e.$instOf_"+classInternalName.replace('/', '_')+") {");

  1124                         out.append("gt="+e.handler_pc+"; continue;");

  1125                         out.append("} ");

  1126                     } else {

  1127                         //finally - todo

  1128                     }

  1129                 }

  1130                 out.append("throw e;");

  1131                 out.append("}");

  1132             }

  1133             out.append(" //");

  1134             for (int j = prev; j <= i; j++) {

  1135                 out.append(" ");

  1136                 final int cc = readByte(byteCodes, j);

  1137                 out.append(Integer.toString(cc));

  1138             }

  1139             out.append("\n");            

  1140         }

  1141         out.append("  }\n");

  1142         out.append("};");

  1143     }

  1144 

  1145     private int generateIf(byte[] byteCodes, int i,

  1146                            final Variable v2, final Variable v1,

  1147                            final String test) throws IOException {

  1148         int indx = i + readIntArg(byteCodes, i);

  1149         out.append("if (").append(v1)

  1150            .append(' ').append(test).append(' ')

  1151            .append(v2).append(") { gt = " + indx)

  1152            .append("; continue; }");

  1153         return i + 2;

  1154     }

  1155 

  1156     private int readIntArg(byte[] byteCodes, int offsetInstruction) {

  1157         final int indxHi = byteCodes[offsetInstruction + 1] << 8;

  1158         final int indxLo = byteCodes[offsetInstruction + 2];

  1159         return (indxHi & 0xffffff00) | (indxLo & 0xff);

  1160     }

  1161     private int readInt4(byte[] byteCodes, int offsetInstruction) {

  1162         final int d = byteCodes[offsetInstruction + 0] << 24;

  1163         final int c = byteCodes[offsetInstruction + 1] << 16;

  1164         final int b = byteCodes[offsetInstruction + 2] << 8;

  1165         final int a = byteCodes[offsetInstruction + 3];

  1166         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

  1167     }

  1168     private int readByte(byte[] byteCodes, int offsetInstruction) {

  1169         return byteCodes[offsetInstruction] & 0xff;

  1170     }

  1171     

  1172     private static void countArgs(String descriptor, char[] returnType, StringBuilder sig, StringBuilder cnt) {

  1173         int i = 0;

  1174         Boolean count = null;

  1175         boolean array = false;

  1176         sig.append("__");

  1177         int firstPos = sig.length();

  1178         while (i < descriptor.length()) {

  1179             char ch = descriptor.charAt(i++);

  1180             switch (ch) {

  1181                 case '(':

  1182                     count = true;

  1183                     continue;

  1184                 case ')':

  1185                     count = false;

  1186                     continue;

  1187                 case 'B': 

  1188                 case 'C': 

  1189                 case 'D': 

  1190                 case 'F': 

  1191                 case 'I': 

  1192                 case 'J': 

  1193                 case 'S': 

  1194                 case 'Z': 

  1195                     if (count) {

  1196                         if (array) {

  1197                             sig.append("_3");

  1198                         }

  1199                         sig.append(ch);

  1200                         if (ch == 'J' || ch == 'D') {

  1201                             cnt.append('1');

  1202                         } else {

  1203                             cnt.append('0');

  1204                         }

  1205                     } else {

  1206                         sig.insert(firstPos, ch);

  1207                         if (array) {

  1208                             returnType[0] = '[';

  1209                             sig.insert(firstPos, "_3");

  1210                         } else {

  1211                             returnType[0] = ch;

  1212                         }

  1213                     }

  1214                     array = false;

  1215                     continue;

  1216                 case 'V': 

  1217                     assert !count;

  1218                     returnType[0] = 'V';

  1219                     sig.insert(firstPos, 'V');

  1220                     continue;

  1221                 case 'L':

  1222                     int next = descriptor.indexOf(';', i);

  1223                     String realSig = mangleSig(descriptor, i - 1, next + 1);

  1224                     if (count) {

  1225                         if (array) {

  1226                             sig.append("_3");

  1227                         }

  1228                         sig.append(realSig);

  1229                         cnt.append('0');

  1230                     } else {

  1231                         sig.insert(firstPos, realSig);

  1232                         if (array) {

  1233                             sig.insert(firstPos, "_3");

  1234                         }

  1235                         returnType[0] = 'L';

  1236                     }

  1237                     i = next + 1;

  1238                     continue;

  1239                 case '[':

  1240                     array = true;

  1241                     continue;

  1242                 default:

  1243                     throw new IllegalStateException("Invalid char: " + ch);

  1244             }

  1245         }

  1246     }

  1247     

  1248     private static String mangleSig(String txt, int first, int last) {

  1249         StringBuilder sb = new StringBuilder();

  1250         for (int i = first; i < last; i++) {

  1251             final char ch = txt.charAt(i);

  1252             switch (ch) {

  1253                 case '/': sb.append('_'); break;

  1254                 case '_': sb.append("_1"); break;

  1255                 case ';': sb.append("_2"); break;

  1256                 case '[': sb.append("_3"); break;

  1257                 default: sb.append(ch); break;

  1258             }

  1259         }

  1260         return sb.toString();

  1261     }

  1262 

  1263     private static String findMethodName(MethodData m, StringBuilder cnt) {

  1264         StringBuilder name = new StringBuilder();

  1265         if ("<init>".equals(m.getName())) { // NOI18N

  1266             name.append("cons"); // NOI18N

  1267         } else if ("<clinit>".equals(m.getName())) { // NOI18N

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

  1269         } else {

  1270             name.append(m.getName());

  1271         } 

  1272         

  1273         countArgs(m.getInternalSig(), new char[1], name, cnt);

  1274         return name.toString();

  1275     }

  1276 

  1277     static String findMethodName(String[] mi, StringBuilder cnt, char[] returnType) {

  1278         StringBuilder name = new StringBuilder();

  1279         String descr = mi[2];//mi.getDescriptor();

  1280         String nm= mi[1];

  1281         if ("<init>".equals(nm)) { // NOI18N

  1282             name.append("cons"); // NOI18N

  1283         } else {

  1284             name.append(nm);

  1285         }

  1286         countArgs(descr, returnType, name, cnt);

  1287         return name.toString();

  1288     }

  1289 

  1290     private int invokeStaticMethod(byte[] byteCodes, int i, final StackMapper mapper, boolean isStatic)

  1291     throws IOException {

  1292         int methodIndex = readIntArg(byteCodes, i);

  1293         String[] mi = jc.getFieldInfoName(methodIndex);

  1294         char[] returnType = { 'V' };

  1295         StringBuilder cnt = new StringBuilder();

  1296         String mn = findMethodName(mi, cnt, returnType);

  1297 

  1298         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1299         final Variable[] vars = new Variable[numArguments];

  1300 

  1301         for (int j = numArguments - 1; j >= 0; --j) {

  1302             vars[j] = mapper.pop();

  1303         }

  1304 

  1305         if (returnType[0] != 'V') {

  1306             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1307                .append(" = ");

  1308         }

  1309 

  1310         final String in = mi[0];

  1311         out.append(accessClass(in.replace('/', '_')));

  1312         out.append("(false).");

  1313         out.append(mn);

  1314         out.append('(');

  1315         if (numArguments > 0) {

  1316             out.append(vars[0]);

  1317             for (int j = 1; j < numArguments; ++j) {

  1318                 out.append(", ");

  1319                 out.append(vars[j]);

  1320             }

  1321         }

  1322         out.append(");");

  1323         i += 2;

  1324         addReference(in);

  1325         return i;

  1326     }

  1327     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackMapper mapper)

  1328     throws IOException {

  1329         int methodIndex = readIntArg(byteCodes, i);

  1330         String[] mi = jc.getFieldInfoName(methodIndex);

  1331         char[] returnType = { 'V' };

  1332         StringBuilder cnt = new StringBuilder();

  1333         String mn = findMethodName(mi, cnt, returnType);

  1334 

  1335         final int numArguments = cnt.length() + 1;

  1336         final Variable[] vars = new Variable[numArguments];

  1337 

  1338         for (int j = numArguments - 1; j >= 0; --j) {

  1339             vars[j] = mapper.pop();

  1340         }

  1341 

  1342         if (returnType[0] != 'V') {

  1343             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1344                .append(" = ");

  1345         }

  1346 

  1347         out.append(vars[0]).append('.');

  1348         out.append(mn);

  1349         out.append('(');

  1350         out.append(vars[0]);

  1351         for (int j = 1; j < numArguments; ++j) {

  1352             out.append(", ");

  1353             out.append(vars[j]);

  1354         }

  1355         out.append(");");

  1356         i += 2;

  1357         return i;

  1358     }

  1359 

  1360     private void addReference(String cn) throws IOException {

  1361         if (requireReference(cn)) {

  1362             out.append(" /* needs ").append(cn).append(" */");

  1363         }

  1364     }

  1365 

  1366     private void outType(String d, StringBuilder out) {

  1367         int arr = 0;

  1368         while (d.charAt(0) == '[') {

  1369             out.append('A');

  1370             d = d.substring(1);

  1371         }

  1372         if (d.charAt(0) == 'L') {

  1373             assert d.charAt(d.length() - 1) == ';';

  1374             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1375         } else {

  1376             out.append(d);

  1377         }

  1378     }

  1379 

  1380     private String encodeConstant(int entryIndex) throws IOException {

  1381         String[] classRef = { null };

  1382         String s = jc.stringValue(entryIndex, classRef);

  1383         if (classRef[0] != null) {

  1384             addReference(classRef[0]);

  1385             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1386         }

  1387         return s;

  1388     }

  1389 

  1390     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1391         byte[] arr = m.findAnnotationData(true);

  1392         if (arr == null) {

  1393             return null;

  1394         }

  1395         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1396         class P extends AnnotationParser {

  1397             public P() {

  1398                 super(false);

  1399             }

  1400             

  1401             int cnt;

  1402             String[] args = new String[30];

  1403             String body;

  1404             

  1405             @Override

  1406             protected void visitAttr(String type, String attr, String at, String value) {

  1407                 if (type.equals(jvmType)) {

  1408                     if ("body".equals(attr)) {

  1409                         body = value;

  1410                     } else if ("args".equals(attr)) {

  1411                         args[cnt++] = value;

  1412                     } else {

  1413                         throw new IllegalArgumentException(attr);

  1414                     }

  1415                 }

  1416             }

  1417         }

  1418         P p = new P();

  1419         p.parse(arr, jc);

  1420         if (p.body == null) {

  1421             return null;

  1422         }

  1423         StringBuilder cnt = new StringBuilder();

  1424         final String mn = findMethodName(m, cnt);

  1425         out.append(prefix).append(mn);

  1426         out.append(" = function(");

  1427         String space;

  1428         int index;

  1429         if (!isStatic) {                

  1430             space = outputArg(out, p.args, 0);

  1431             index = 1;

  1432         } else {

  1433             space = "";

  1434             index = 0;

  1435         }

  1436         for (int i = 0; i < cnt.length(); i++) {

  1437             out.append(space);

  1438             space = outputArg(out, p.args, index);

  1439             index++;

  1440         }

  1441         out.append(") {").append("\n");

  1442         out.append(p.body);

  1443         out.append("\n}\n");

  1444         return mn;

  1445     }

  1446     private static String className(ClassData jc) {

  1447         //return jc.getName().getInternalName().replace('/', '_');

  1448         return jc.getClassName().replace('/', '_');

  1449     }

  1450     

  1451     private static String[] findAnnotation(

  1452         byte[] arr, ClassData cd, final String className, 

  1453         final String... attrNames

  1454     ) throws IOException {

  1455         if (arr == null) {

  1456             return null;

  1457         }

  1458         final String[] values = new String[attrNames.length];

  1459         final boolean[] found = { false };

  1460         final String jvmType = "L" + className.replace('.', '/') + ";";

  1461         AnnotationParser ap = new AnnotationParser(false) {

  1462             @Override

  1463             protected void visitAttr(String type, String attr, String at, String value) {

  1464                 if (type.equals(jvmType)) {

  1465                     found[0] = true;

  1466                     for (int i = 0; i < attrNames.length; i++) {

  1467                         if (attrNames[i].equals(attr)) {

  1468                             values[i] = value;

  1469                         }

  1470                     }

  1471                 }

  1472             }

  1473             

  1474         };

  1475         ap.parse(arr, cd);

  1476         return found[0] ? values : null;

  1477     }

  1478 

  1479     private CharSequence initField(FieldData v) {

  1480         final String is = v.getInternalSig();

  1481         if (is.length() == 1) {

  1482             switch (is.charAt(0)) {

  1483                 case 'S':

  1484                 case 'J':

  1485                 case 'B':

  1486                 case 'Z':

  1487                 case 'C':

  1488                 case 'I': return " = 0;";

  1489                 case 'F': 

  1490                 case 'D': return " = 0.0;";

  1491                 default:

  1492                     throw new IllegalStateException(is);

  1493             }

  1494         }

  1495         return " = null;";

  1496     }

  1497 

  1498     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1499         AnnotationParser ap = new AnnotationParser(true) {

  1500             int anno;

  1501             int cnt;

  1502             

  1503             @Override

  1504             protected void visitAnnotationStart(String type) throws IOException {

  1505                 if (anno++ > 0) {

  1506                     out.append(",");

  1507                 }

  1508                 out.append('"').append(type).append("\" : {\n");

  1509                 cnt = 0;

  1510             }

  1511 

  1512             @Override

  1513             protected void visitAnnotationEnd(String type) throws IOException {

  1514                 out.append("\n}\n");

  1515             }

  1516             

  1517             @Override

  1518             protected void visitAttr(String type, String attr, String attrType, String value) 

  1519             throws IOException {

  1520                 if (attr == null) {

  1521                     return;

  1522                 }

  1523                 if (cnt++ > 0) {

  1524                     out.append(",\n");

  1525                 }

  1526                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1527             }

  1528         };

  1529         ap.parse(data, cd);

  1530     }

  1531 

  1532     private static String outputArg(Appendable out, String[] args, int indx) throws IOException {

  1533         final String name = args[indx];

  1534         if (name == null) {

  1535             return "";

  1536         }

  1537         if (name.contains(",")) {

  1538             throw new IOException("Wrong parameter with ',': " + name);

  1539         }

  1540         out.append(name);

  1541         return ",";

  1542     }

  1543 

  1544     private static void emit(final Appendable out,

  1545                              final String format,

  1546                              final CharSequence... params) throws IOException {

  1547         final int length = format.length();

  1548 

  1549         int processed = 0;

  1550         int paramOffset = format.indexOf('@');

  1551         while ((paramOffset != -1) && (paramOffset < (length - 1))) {

  1552             final char paramChar = format.charAt(paramOffset + 1);

  1553             if ((paramChar >= '1') && (paramChar <= '9')) {

  1554                 final int paramIndex = paramChar - '0' - 1;

  1555 

  1556                 out.append(format, processed, paramOffset);

  1557                 out.append(params[paramIndex]);

  1558 

  1559                 ++paramOffset;

  1560                 processed = paramOffset + 1;

  1561             }

  1562 

  1563             paramOffset = format.indexOf('@', paramOffset + 1);

  1564         }

  1565 

  1566         out.append(format, processed, length);

  1567     }

  1568 }
hg/bck2brwsr