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vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
author Martin Soch <Martin.Soch@oracle.com>
Tue, 18 Dec 2012 20:19:11 +0100
brancharithmetic
changeset 351 b7459b10d581
parent 337 adbf21ccc315
child 427 12e866a32b40
permissions -rw-r--r--
Added test for + - * operations in int32 arithmetic, updated JS generator to produce code for correct int32 arithmetic. 
     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.cnstr = CLS;");

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

   160         if (classAnno != null) {

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

   162             generateAnno(jc, out, classAnno);

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

   164         }

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

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

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

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

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

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

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

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

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

   174                 "name", "value"

   175             );

   176             if (only != null) {

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

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

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

   180                 }

   181                 continue;

   182             }

   183             if (!v.isStatic()) {

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

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

   186             }

   187         }

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

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

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

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

   192         StringBuilder sb = new StringBuilder();

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

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

   195         }

   196         return sb.toString();

   197     }

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

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

   200         if (jsb != null) {

   201             return jsb;

   202         }

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

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

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

   206         }

   207         generateMethod(prefix, mn, m);

   208         return mn;

   209     }

   210 

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

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

   213         if (jsb != null) {

   214             return jsb;

   215         }

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

   217         generateMethod(prefix, mn, m);

   218         return mn;

   219     }

   220 

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

   222             throws IOException {

   223         final StackMapIterator stackMapIterator = m.createStackMapIterator();

   224         final LocalsMapper lmapper =

   225                 new LocalsMapper(stackMapIterator.getArguments());

   226 

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

   228         lmapper.outputArguments(out);

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

   230 

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

   232         if (byteCodes == null) {

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

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

   235             out.append("};");

   236             return;

   237         }

   238 

   239         final StackMapper smapper = new StackMapper();

   240 

   241         final int maxLocals = m.getMaxLocals();

   242         if (maxLocals > 0) {

   243             // TODO: generate only used local variables

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

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

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

   247                     out.append(", ");

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

   249                 }

   250                 out.append(';');

   251             }

   252         }

   253 

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

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

   256         final int maxStack = m.getMaxStack();

   257         if (maxStack > 0) {

   258             // TODO: generate only used stack variables

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

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

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

   262                     out.append(", ");

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

   264                 }

   265                 out.append(';');

   266             }

   267         }

   268 

   269         int lastStackFrame = -1;

   270 

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

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

   273             int prev = i;

   274             stackMapIterator.advanceTo(i);

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

   276                 lastStackFrame = stackMapIterator.getFrameIndex();

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

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

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

   280             } else {

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

   282             }

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

   284             switch (c) {

   285                 case opc_aload_0:

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

   287                     break;

   288                 case opc_iload_0:

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

   290                     break;

   291                 case opc_lload_0:

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

   293                     break;

   294                 case opc_fload_0:

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

   296                     break;

   297                 case opc_dload_0:

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

   299                     break;

   300                 case opc_aload_1:

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

   302                     break;

   303                 case opc_iload_1:

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

   305                     break;

   306                 case opc_lload_1:

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

   308                     break;

   309                 case opc_fload_1:

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

   311                     break;

   312                 case opc_dload_1:

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

   314                     break;

   315                 case opc_aload_2:

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

   317                     break;

   318                 case opc_iload_2:

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

   320                     break;

   321                 case opc_lload_2:

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

   323                     break;

   324                 case opc_fload_2:

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

   326                     break;

   327                 case opc_dload_2:

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

   329                     break;

   330                 case opc_aload_3:

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

   332                     break;

   333                 case opc_iload_3:

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

   335                     break;

   336                 case opc_lload_3:

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

   338                     break;

   339                 case opc_fload_3:

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

   341                     break;

   342                 case opc_dload_3:

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

   344                     break;

   345                 case opc_iload: {

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

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

   348                     break;

   349                 }

   350                 case opc_lload: {

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

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

   353                     break;

   354                 }

   355                 case opc_fload: {

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

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

   358                     break;

   359                 }

   360                 case opc_dload: {

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

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

   363                     break;

   364                 }

   365                 case opc_aload: {

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

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

   368                     break;

   369                 }

   370                 case opc_istore: {

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

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

   373                     break;

   374                 }

   375                 case opc_lstore: {

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

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

   378                     break;

   379                 }

   380                 case opc_fstore: {

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

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

   383                     break;

   384                 }

   385                 case opc_dstore: {

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

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

   388                     break;

   389                 }

   390                 case opc_astore: {

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

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

   393                     break;

   394                 }

   395                 case opc_astore_0:

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

   397                     break;

   398                 case opc_istore_0:

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

   400                     break;

   401                 case opc_lstore_0:

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

   403                     break;

   404                 case opc_fstore_0:

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

   406                     break;

   407                 case opc_dstore_0:

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

   409                     break;

   410                 case opc_astore_1:

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

   412                     break;

   413                 case opc_istore_1:

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

   415                     break;

   416                 case opc_lstore_1:

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

   418                     break;

   419                 case opc_fstore_1:

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

   421                     break;

   422                 case opc_dstore_1:

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

   424                     break;

   425                 case opc_astore_2:

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

   427                     break;

   428                 case opc_istore_2:

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

   430                     break;

   431                 case opc_lstore_2:

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

   433                     break;

   434                 case opc_fstore_2:

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

   436                     break;

   437                 case opc_dstore_2:

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

   439                     break;

   440                 case opc_astore_3:

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

   442                     break;

   443                 case opc_istore_3:

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

   445                     break;

   446                 case opc_lstore_3:

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

   448                     break;

   449                 case opc_fstore_3:

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

   451                     break;

   452                 case opc_dstore_3:

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

   454                     break;

   455                 case opc_iadd:

   456                     emit(out, "@1 = (@1 + @2) | 0;", smapper.getI(1), smapper.popI());

   457                     break;

   458                 case opc_ladd:

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

   460                     break;

   461                 case opc_fadd:

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

   463                     break;

   464                 case opc_dadd:

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

   466                     break;

   467                 case opc_isub:

   468                     emit(out, "@1 = (@1 - @2) | 0;", smapper.getI(1), smapper.popI());

   469                     break;

   470                 case opc_lsub:

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

   472                     break;

   473                 case opc_fsub:

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

   475                     break;

   476                 case opc_dsub:

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

   478                     break;

   479                 case opc_imul:

   480                     emit(out, "@1 = (((@1 * (@2 >> 16)) << 16) + @1 * (@2 & 0xFFFF)) | 0;", smapper.getI(1), smapper.popI());

   481                     break;

   482                 case opc_lmul:

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

   484                     break;

   485                 case opc_fmul:

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

   487                     break;

   488                 case opc_dmul:

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

   490                     break;

   491                 case opc_idiv:

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

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

   494                     break;

   495                 case opc_ldiv:

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

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

   498                     break;

   499                 case opc_fdiv:

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

   501                     break;

   502                 case opc_ddiv:

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

   504                     break;

   505                 case opc_irem:

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

   507                     break;

   508                 case opc_lrem:

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

   510                     break;

   511                 case opc_frem:

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

   513                     break;

   514                 case opc_drem:

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

   516                     break;

   517                 case opc_iand:

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

   519                     break;

   520                 case opc_land:

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

   522                     break;

   523                 case opc_ior:

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

   525                     break;

   526                 case opc_lor:

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

   528                     break;

   529                 case opc_ixor:

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

   531                     break;

   532                 case opc_lxor:

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

   534                     break;

   535                 case opc_ineg:

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

   537                     break;

   538                 case opc_lneg:

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

   540                     break;

   541                 case opc_fneg:

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

   543                     break;

   544                 case opc_dneg:

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

   546                     break;

   547                 case opc_ishl:

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

   549                     break;

   550                 case opc_lshl:

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

   552                     break;

   553                 case opc_ishr:

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

   555                     break;

   556                 case opc_lshr:

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

   558                     break;

   559                 case opc_iushr:

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

   561                     break;

   562                 case opc_lushr:

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

   564                     break;

   565                 case opc_iinc: {

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

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

   568                     if (incrBy == 1) {

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

   570                     } else {

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

   572                              lmapper.getI(varIndx),

   573                              Integer.toString(incrBy));

   574                     }

   575                     break;

   576                 }

   577                 case opc_return:

   578                     emit(out, "return;");

   579                     break;

   580                 case opc_ireturn:

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

   582                     break;

   583                 case opc_lreturn:

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

   585                     break;

   586                 case opc_freturn:

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

   588                     break;

   589                 case opc_dreturn:

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

   591                     break;

   592                 case opc_areturn:

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

   594                     break;

   595                 case opc_i2l:

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

   597                     break;

   598                 case opc_i2f:

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

   600                     break;

   601                 case opc_i2d:

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

   603                     break;

   604                 case opc_l2i:

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

   606                     break;

   607                     // max int check?

   608                 case opc_l2f:

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

   610                     break;

   611                 case opc_l2d:

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

   613                     break;

   614                 case opc_f2d:

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

   616                     break;

   617                 case opc_d2f:

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

   619                     break;

   620                 case opc_f2i:

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

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

   623                     break;

   624                 case opc_f2l:

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

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

   627                     break;

   628                 case opc_d2i:

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

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

   631                     break;

   632                 case opc_d2l:

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

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

   635                     break;

   636                 case opc_i2b:

   637                 case opc_i2c:

   638                 case opc_i2s:

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

   640                     break;

   641                 case opc_aconst_null:

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

   643                     break;

   644                 case opc_iconst_m1:

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

   646                     break;

   647                 case opc_iconst_0:

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

   649                     break;

   650                 case opc_dconst_0:

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

   652                     break;

   653                 case opc_lconst_0:

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

   655                     break;

   656                 case opc_fconst_0:

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

   658                     break;

   659                 case opc_iconst_1:

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

   661                     break;

   662                 case opc_lconst_1:

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

   664                     break;

   665                 case opc_fconst_1:

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

   667                     break;

   668                 case opc_dconst_1:

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

   670                     break;

   671                 case opc_iconst_2:

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

   673                     break;

   674                 case opc_fconst_2:

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

   676                     break;

   677                 case opc_iconst_3:

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

   679                     break;

   680                 case opc_iconst_4:

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

   682                     break;

   683                 case opc_iconst_5:

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

   685                     break;

   686                 case opc_ldc: {

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

   688                     String v = encodeConstant(indx);

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

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

   691                     break;

   692                 }

   693                 case opc_ldc_w:

   694                 case opc_ldc2_w: {

   695                     int indx = readIntArg(byteCodes, i);

   696                     i += 2;

   697                     String v = encodeConstant(indx);

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

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

   700                     break;

   701                 }

   702                 case opc_lcmp:

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

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

   705                     break;

   706                 case opc_fcmpl:

   707                 case opc_fcmpg:

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

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

   710                     break;

   711                 case opc_dcmpl:

   712                 case opc_dcmpg:

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

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

   715                     break;

   716                 case opc_if_acmpeq:

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

   718                                    "===");

   719                     break;

   720                 case opc_if_acmpne:

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

   722                                    "!=");

   723                     break;

   724                 case opc_if_icmpeq:

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

   726                                    "==");

   727                     break;

   728                 case opc_ifeq: {

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

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

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

   732                     i += 2;

   733                     break;

   734                 }

   735                 case opc_ifne: {

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

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

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

   739                     i += 2;

   740                     break;

   741                 }

   742                 case opc_iflt: {

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

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

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

   746                     i += 2;

   747                     break;

   748                 }

   749                 case opc_ifle: {

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

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

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

   753                     i += 2;

   754                     break;

   755                 }

   756                 case opc_ifgt: {

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

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

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

   760                     i += 2;

   761                     break;

   762                 }

   763                 case opc_ifge: {

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

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

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

   767                     i += 2;

   768                     break;

   769                 }

   770                 case opc_ifnonnull: {

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

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

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

   774                     i += 2;

   775                     break;

   776                 }

   777                 case opc_ifnull: {

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

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

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

   781                     i += 2;

   782                     break;

   783                 }

   784                 case opc_if_icmpne:

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

   786                                    "!=");

   787                     break;

   788                 case opc_if_icmplt:

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

   790                                    "<");

   791                     break;

   792                 case opc_if_icmple:

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

   794                                    "<=");

   795                     break;

   796                 case opc_if_icmpgt:

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

   798                                    ">");

   799                     break;

   800                 case opc_if_icmpge:

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

   802                                    ">=");

   803                     break;

   804                 case opc_goto: {

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

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

   807                     i += 2;

   808                     break;

   809                 }

   810                 case opc_lookupswitch: {

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

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

   813                     table += 4;

   814                     int n = readInt4(byteCodes, table);

   815                     table += 4;

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

   817                     while (n-- > 0) {

   818                         int cnstnt = readInt4(byteCodes, table);

   819                         table += 4;

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

   821                         table += 4;

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

   823                     }

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

   825                     i = table - 1;

   826                     break;

   827                 }

   828                 case opc_tableswitch: {

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

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

   831                     table += 4;

   832                     int low = readInt4(byteCodes, table);

   833                     table += 4;

   834                     int high = readInt4(byteCodes, table);

   835                     table += 4;

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

   837                     while (low <= high) {

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

   839                         table += 4;

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

   841                         low++;

   842                     }

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

   844                     i = table - 1;

   845                     break;

   846                 }

   847                 case opc_invokeinterface: {

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

   849                     break;

   850                 }

   851                 case opc_invokevirtual:

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

   853                     break;

   854                 case opc_invokespecial:

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

   856                     break;

   857                 case opc_invokestatic:

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

   859                     break;

   860                 case opc_new: {

   861                     int indx = readIntArg(byteCodes, i);

   862                     String ci = jc.getClassName(indx);

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

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

   865                     addReference(ci);

   866                     i += 2;

   867                     break;

   868                 }

   869                 case opc_newarray:

   870                     ++i; // skip type of array

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

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

   873                     break;

   874                 case opc_anewarray:

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

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

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

   878                     break;

   879                 case opc_multianewarray: {

   880                     i += 2;

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

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

   883                        .append(").fillNulls();");

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

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

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

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

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

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

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

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

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

   893                             append(";");

   894                     }

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

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

   897                     }

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

   899                     break;

   900                 }

   901                 case opc_arraylength:

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

   903                     break;

   904                 case opc_lastore:

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

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

   907                     break;

   908                 case opc_fastore:

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

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

   911                     break;

   912                 case opc_dastore:

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

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

   915                     break;

   916                 case opc_aastore:

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

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

   919                     break;

   920                 case opc_iastore:

   921                 case opc_bastore:

   922                 case opc_castore:

   923                 case opc_sastore:

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

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

   926                     break;

   927                 case opc_laload:

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

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

   930                     break;

   931                 case opc_faload:

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

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

   934                     break;

   935                 case opc_daload:

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

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

   938                     break;

   939                 case opc_aaload:

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

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

   942                     break;

   943                 case opc_iaload:

   944                 case opc_baload:

   945                 case opc_caload:

   946                 case opc_saload:

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

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

   949                     break;

   950                 case opc_pop:

   951                 case opc_pop2:

   952                     smapper.pop(1);

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

   954                     break;

   955                 case opc_dup: {

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

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

   958                     break;

   959                 }

   960                 case opc_dup2: {

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

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

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

   964                     } else {

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

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

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

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

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

   970                     }

   971                     break;

   972                 }

   973                 case opc_dup_x1: {

   974                     final Variable vi1 = smapper.pop();

   975                     final Variable vi2 = smapper.pop();

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

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

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

   979 

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

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

   982                     break;

   983                 }

   984                 case opc_dup_x2: {

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

   986                         final Variable vi1 = smapper.pop();

   987                         final Variable vi2 = smapper.pop();

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

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

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

   991 

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

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

   994                     } else {

   995                         final Variable vi1 = smapper.pop();

   996                         final Variable vi2 = smapper.pop();

   997                         final Variable vi3 = smapper.pop();

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

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

  1000                         final Variable vo2 = smapper.pushT(vi2.getType());

  1001                         final Variable vo1 = smapper.pushT(vi1.getType());

  1002 

  1003                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; @7 = @8; }",

  1004                              vo1, vi1, vo2, vi2, vo3, vi3, vo4, vo1);

  1005                     }

  1006                     break;

  1007                 }

  1008                 case opc_bipush:

  1009                     emit(out, "@1 = @2;",

  1010                          smapper.pushI(), Integer.toString(byteCodes[++i]));

  1011                     break;

  1012                 case opc_sipush:

  1013                     emit(out, "@1 = @2;",

  1014                          smapper.pushI(),

  1015                          Integer.toString(readIntArg(byteCodes, i)));

  1016                     i += 2;

  1017                     break;

  1018                 case opc_getfield: {

  1019                     int indx = readIntArg(byteCodes, i);

  1020                     String[] fi = jc.getFieldInfoName(indx);

  1021                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1022                     emit(out, "@2 = @1.fld_@3;",

  1023                          smapper.popA(), smapper.pushT(type), fi[1]);

  1024                     i += 2;

  1025                     break;

  1026                 }

  1027                 case opc_getstatic: {

  1028                     int indx = readIntArg(byteCodes, i);

  1029                     String[] fi = jc.getFieldInfoName(indx);

  1030                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1031                     emit(out, "@1 = @2.@3;",

  1032                          smapper.pushT(type),

  1033                          accessClass(fi[0].replace('/', '_')), fi[1]);

  1034                     i += 2;

  1035                     addReference(fi[0]);

  1036                     break;

  1037                 }

  1038                 case opc_putfield: {

  1039                     int indx = readIntArg(byteCodes, i);

  1040                     String[] fi = jc.getFieldInfoName(indx);

  1041                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1042                     emit(out, "@2.fld_@3 = @1;",

  1043                          smapper.popT(type), smapper.popA(), fi[1]);

  1044                     i += 2;

  1045                     break;

  1046                 }

  1047                 case opc_putstatic: {

  1048                     int indx = readIntArg(byteCodes, i);

  1049                     String[] fi = jc.getFieldInfoName(indx);

  1050                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1051                     emit(out, "@1.@2 = @3;",

  1052                          accessClass(fi[0].replace('/', '_')), fi[1],

  1053                          smapper.popT(type));

  1054                     i += 2;

  1055                     addReference(fi[0]);

  1056                     break;

  1057                 }

  1058                 case opc_checkcast: {

  1059                     int indx = readIntArg(byteCodes, i);

  1060                     final String type = jc.getClassName(indx);

  1061                     if (!type.startsWith("[")) {

  1062                         // no way to check arrays right now

  1063                         // XXX proper exception

  1064                         emit(out,

  1065                              "if (@1 !== null && !@1.$instOf_@2) throw {};",

  1066                              smapper.getA(0), type.replace('/', '_'));

  1067                     }

  1068                     i += 2;

  1069                     break;

  1070                 }

  1071                 case opc_instanceof: {

  1072                     int indx = readIntArg(byteCodes, i);

  1073                     final String type = jc.getClassName(indx);

  1074                     emit(out, "@2 = @1.$instOf_@3 ? 1 : 0;",

  1075                          smapper.popA(), smapper.pushI(),

  1076                          type.replace('/', '_'));

  1077                     i += 2;

  1078                     break;

  1079                 }

  1080                 case opc_athrow: {

  1081                     final Variable v = smapper.popA();

  1082                     smapper.clear();

  1083 

  1084                     emit(out, "{ @1 = @2; throw @2; }",

  1085                          smapper.pushA(), v);

  1086                     break;

  1087                 }

  1088 

  1089                 case opc_monitorenter: {

  1090                     out.append("/* monitor enter */");

  1091                     smapper.popA();

  1092                     break;

  1093                 }

  1094 

  1095                 case opc_monitorexit: {

  1096                     out.append("/* monitor exit */");

  1097                     smapper.popA();

  1098                     break;

  1099                 }

  1100 

  1101                 default: {

  1102                     emit(out, "throw 'unknown bytecode @1';",

  1103                          Integer.toString(c));

  1104                 }

  1105             }

  1106             out.append(" //");

  1107             for (int j = prev; j <= i; j++) {

  1108                 out.append(" ");

  1109                 final int cc = readByte(byteCodes, j);

  1110                 out.append(Integer.toString(cc));

  1111             }

  1112             out.append("\n");

  1113         }

  1114         out.append("  }\n");

  1115         out.append("};");

  1116     }

  1117 

  1118     private int generateIf(byte[] byteCodes, int i,

  1119                            final Variable v2, final Variable v1,

  1120                            final String test) throws IOException {

  1121         int indx = i + readIntArg(byteCodes, i);

  1122         out.append("if (").append(v1)

  1123            .append(' ').append(test).append(' ')

  1124            .append(v2).append(") { gt = " + indx)

  1125            .append("; continue; }");

  1126         return i + 2;

  1127     }

  1128 

  1129     private int readIntArg(byte[] byteCodes, int offsetInstruction) {

  1130         final int indxHi = byteCodes[offsetInstruction + 1] << 8;

  1131         final int indxLo = byteCodes[offsetInstruction + 2];

  1132         return (indxHi & 0xffffff00) | (indxLo & 0xff);

  1133     }

  1134     private int readInt4(byte[] byteCodes, int offsetInstruction) {

  1135         final int d = byteCodes[offsetInstruction + 0] << 24;

  1136         final int c = byteCodes[offsetInstruction + 1] << 16;

  1137         final int b = byteCodes[offsetInstruction + 2] << 8;

  1138         final int a = byteCodes[offsetInstruction + 3];

  1139         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

  1140     }

  1141     private int readByte(byte[] byteCodes, int offsetInstruction) {

  1142         return byteCodes[offsetInstruction] & 0xff;

  1143     }

  1144     

  1145     private static void countArgs(String descriptor, char[] returnType, StringBuilder sig, StringBuilder cnt) {

  1146         int i = 0;

  1147         Boolean count = null;

  1148         boolean array = false;

  1149         sig.append("__");

  1150         int firstPos = sig.length();

  1151         while (i < descriptor.length()) {

  1152             char ch = descriptor.charAt(i++);

  1153             switch (ch) {

  1154                 case '(':

  1155                     count = true;

  1156                     continue;

  1157                 case ')':

  1158                     count = false;

  1159                     continue;

  1160                 case 'B': 

  1161                 case 'C': 

  1162                 case 'D': 

  1163                 case 'F': 

  1164                 case 'I': 

  1165                 case 'J': 

  1166                 case 'S': 

  1167                 case 'Z': 

  1168                     if (count) {

  1169                         if (array) {

  1170                             sig.append("_3");

  1171                         }

  1172                         sig.append(ch);

  1173                         if (ch == 'J' || ch == 'D') {

  1174                             cnt.append('1');

  1175                         } else {

  1176                             cnt.append('0');

  1177                         }

  1178                     } else {

  1179                         sig.insert(firstPos, ch);

  1180                         if (array) {

  1181                             returnType[0] = '[';

  1182                             sig.insert(firstPos, "_3");

  1183                         } else {

  1184                             returnType[0] = ch;

  1185                         }

  1186                     }

  1187                     array = false;

  1188                     continue;

  1189                 case 'V': 

  1190                     assert !count;

  1191                     returnType[0] = 'V';

  1192                     sig.insert(firstPos, 'V');

  1193                     continue;

  1194                 case 'L':

  1195                     int next = descriptor.indexOf(';', i);

  1196                     String realSig = mangleSig(descriptor, i - 1, next + 1);

  1197                     if (count) {

  1198                         if (array) {

  1199                             sig.append("_3");

  1200                         }

  1201                         sig.append(realSig);

  1202                         cnt.append('0');

  1203                     } else {

  1204                         sig.insert(firstPos, realSig);

  1205                         if (array) {

  1206                             sig.insert(firstPos, "_3");

  1207                         }

  1208                         returnType[0] = 'L';

  1209                     }

  1210                     i = next + 1;

  1211                     continue;

  1212                 case '[':

  1213                     array = true;

  1214                     continue;

  1215                 default:

  1216                     throw new IllegalStateException("Invalid char: " + ch);

  1217             }

  1218         }

  1219     }

  1220     

  1221     private static String mangleSig(String txt, int first, int last) {

  1222         StringBuilder sb = new StringBuilder();

  1223         for (int i = first; i < last; i++) {

  1224             final char ch = txt.charAt(i);

  1225             switch (ch) {

  1226                 case '/': sb.append('_'); break;

  1227                 case '_': sb.append("_1"); break;

  1228                 case ';': sb.append("_2"); break;

  1229                 case '[': sb.append("_3"); break;

  1230                 default: sb.append(ch); break;

  1231             }

  1232         }

  1233         return sb.toString();

  1234     }

  1235 

  1236     private static String findMethodName(MethodData m, StringBuilder cnt) {

  1237         StringBuilder name = new StringBuilder();

  1238         if ("<init>".equals(m.getName())) { // NOI18N

  1239             name.append("cons"); // NOI18N

  1240         } else if ("<clinit>".equals(m.getName())) { // NOI18N

  1241             name.append("class"); // NOI18N

  1242         } else {

  1243             name.append(m.getName());

  1244         } 

  1245         

  1246         countArgs(m.getInternalSig(), new char[1], name, cnt);

  1247         return name.toString();

  1248     }

  1249 

  1250     static String findMethodName(String[] mi, StringBuilder cnt, char[] returnType) {

  1251         StringBuilder name = new StringBuilder();

  1252         String descr = mi[2];//mi.getDescriptor();

  1253         String nm= mi[1];

  1254         if ("<init>".equals(nm)) { // NOI18N

  1255             name.append("cons"); // NOI18N

  1256         } else {

  1257             name.append(nm);

  1258         }

  1259         countArgs(descr, returnType, name, cnt);

  1260         return name.toString();

  1261     }

  1262 

  1263     private int invokeStaticMethod(byte[] byteCodes, int i, final StackMapper mapper, boolean isStatic)

  1264     throws IOException {

  1265         int methodIndex = readIntArg(byteCodes, i);

  1266         String[] mi = jc.getFieldInfoName(methodIndex);

  1267         char[] returnType = { 'V' };

  1268         StringBuilder cnt = new StringBuilder();

  1269         String mn = findMethodName(mi, cnt, returnType);

  1270 

  1271         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1272         final Variable[] vars = new Variable[numArguments];

  1273 

  1274         for (int j = numArguments - 1; j >= 0; --j) {

  1275             vars[j] = mapper.pop();

  1276         }

  1277 

  1278         if (returnType[0] != 'V') {

  1279             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1280                .append(" = ");

  1281         }

  1282 

  1283         final String in = mi[0];

  1284         out.append(accessClass(in.replace('/', '_')));

  1285         out.append("(false).");

  1286         out.append(mn);

  1287         out.append('(');

  1288         if (numArguments > 0) {

  1289             out.append(vars[0]);

  1290             for (int j = 1; j < numArguments; ++j) {

  1291                 out.append(", ");

  1292                 out.append(vars[j]);

  1293             }

  1294         }

  1295         out.append(");");

  1296         i += 2;

  1297         addReference(in);

  1298         return i;

  1299     }

  1300     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackMapper mapper)

  1301     throws IOException {

  1302         int methodIndex = readIntArg(byteCodes, i);

  1303         String[] mi = jc.getFieldInfoName(methodIndex);

  1304         char[] returnType = { 'V' };

  1305         StringBuilder cnt = new StringBuilder();

  1306         String mn = findMethodName(mi, cnt, returnType);

  1307 

  1308         final int numArguments = cnt.length() + 1;

  1309         final Variable[] vars = new Variable[numArguments];

  1310 

  1311         for (int j = numArguments - 1; j >= 0; --j) {

  1312             vars[j] = mapper.pop();

  1313         }

  1314 

  1315         if (returnType[0] != 'V') {

  1316             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1317                .append(" = ");

  1318         }

  1319 

  1320         out.append(vars[0]).append('.');

  1321         out.append(mn);

  1322         out.append('(');

  1323         out.append(vars[0]);

  1324         for (int j = 1; j < numArguments; ++j) {

  1325             out.append(", ");

  1326             out.append(vars[j]);

  1327         }

  1328         out.append(");");

  1329         i += 2;

  1330         return i;

  1331     }

  1332 

  1333     private void addReference(String cn) throws IOException {

  1334         if (requireReference(cn)) {

  1335             out.append(" /* needs ").append(cn).append(" */");

  1336         }

  1337     }

  1338 

  1339     private void outType(String d, StringBuilder out) {

  1340         int arr = 0;

  1341         while (d.charAt(0) == '[') {

  1342             out.append('A');

  1343             d = d.substring(1);

  1344         }

  1345         if (d.charAt(0) == 'L') {

  1346             assert d.charAt(d.length() - 1) == ';';

  1347             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1348         } else {

  1349             out.append(d);

  1350         }

  1351     }

  1352 

  1353     private String encodeConstant(int entryIndex) throws IOException {

  1354         String[] classRef = { null };

  1355         String s = jc.stringValue(entryIndex, classRef);

  1356         if (classRef[0] != null) {

  1357             addReference(classRef[0]);

  1358             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1359         }

  1360         return s;

  1361     }

  1362 

  1363     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1364         byte[] arr = m.findAnnotationData(true);

  1365         if (arr == null) {

  1366             return null;

  1367         }

  1368         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1369         class P extends AnnotationParser {

  1370             public P() {

  1371                 super(false);

  1372             }

  1373             

  1374             int cnt;

  1375             String[] args = new String[30];

  1376             String body;

  1377             

  1378             @Override

  1379             protected void visitAttr(String type, String attr, String at, String value) {

  1380                 if (type.equals(jvmType)) {

  1381                     if ("body".equals(attr)) {

  1382                         body = value;

  1383                     } else if ("args".equals(attr)) {

  1384                         args[cnt++] = value;

  1385                     } else {

  1386                         throw new IllegalArgumentException(attr);

  1387                     }

  1388                 }

  1389             }

  1390         }

  1391         P p = new P();

  1392         p.parse(arr, jc);

  1393         if (p.body == null) {

  1394             return null;

  1395         }

  1396         StringBuilder cnt = new StringBuilder();

  1397         final String mn = findMethodName(m, cnt);

  1398         out.append(prefix).append(mn);

  1399         out.append(" = function(");

  1400         String space;

  1401         int index;

  1402         if (!isStatic) {                

  1403             space = outputArg(out, p.args, 0);

  1404             index = 1;

  1405         } else {

  1406             space = "";

  1407             index = 0;

  1408         }

  1409         for (int i = 0; i < cnt.length(); i++) {

  1410             out.append(space);

  1411             space = outputArg(out, p.args, index);

  1412             index++;

  1413         }

  1414         out.append(") {").append("\n");

  1415         out.append(p.body);

  1416         out.append("\n}\n");

  1417         return mn;

  1418     }

  1419     private static String className(ClassData jc) {

  1420         //return jc.getName().getInternalName().replace('/', '_');

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

  1422     }

  1423     

  1424     private static String[] findAnnotation(

  1425         byte[] arr, ClassData cd, final String className, 

  1426         final String... attrNames

  1427     ) throws IOException {

  1428         if (arr == null) {

  1429             return null;

  1430         }

  1431         final String[] values = new String[attrNames.length];

  1432         final boolean[] found = { false };

  1433         final String jvmType = "L" + className.replace('.', '/') + ";";

  1434         AnnotationParser ap = new AnnotationParser(false) {

  1435             @Override

  1436             protected void visitAttr(String type, String attr, String at, String value) {

  1437                 if (type.equals(jvmType)) {

  1438                     found[0] = true;

  1439                     for (int i = 0; i < attrNames.length; i++) {

  1440                         if (attrNames[i].equals(attr)) {

  1441                             values[i] = value;

  1442                         }

  1443                     }

  1444                 }

  1445             }

  1446             

  1447         };

  1448         ap.parse(arr, cd);

  1449         return found[0] ? values : null;

  1450     }

  1451 

  1452     private CharSequence initField(FieldData v) {

  1453         final String is = v.getInternalSig();

  1454         if (is.length() == 1) {

  1455             switch (is.charAt(0)) {

  1456                 case 'S':

  1457                 case 'J':

  1458                 case 'B':

  1459                 case 'Z':

  1460                 case 'C':

  1461                 case 'I': return " = 0;";

  1462                 case 'F': 

  1463                 case 'D': return " = 0.0;";

  1464                 default:

  1465                     throw new IllegalStateException(is);

  1466             }

  1467         }

  1468         return " = null;";

  1469     }

  1470 

  1471     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1472         AnnotationParser ap = new AnnotationParser(true) {

  1473             int anno;

  1474             int cnt;

  1475             

  1476             @Override

  1477             protected void visitAnnotationStart(String type) throws IOException {

  1478                 if (anno++ > 0) {

  1479                     out.append(",");

  1480                 }

  1481                 out.append('"').append(type).append("\" : {\n");

  1482                 cnt = 0;

  1483             }

  1484 

  1485             @Override

  1486             protected void visitAnnotationEnd(String type) throws IOException {

  1487                 out.append("\n}\n");

  1488             }

  1489             

  1490             @Override

  1491             protected void visitAttr(String type, String attr, String attrType, String value) 

  1492             throws IOException {

  1493                 if (attr == null) {

  1494                     return;

  1495                 }

  1496                 if (cnt++ > 0) {

  1497                     out.append(",\n");

  1498                 }

  1499                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1500             }

  1501         };

  1502         ap.parse(data, cd);

  1503     }

  1504 

  1505     private static String outputArg(Appendable out, String[] args, int indx) throws IOException {

  1506         final String name = args[indx];

  1507         if (name == null) {

  1508             return "";

  1509         }

  1510         if (name.contains(",")) {

  1511             throw new IOException("Wrong parameter with ',': " + name);

  1512         }

  1513         out.append(name);

  1514         return ",";

  1515     }

  1516 

  1517     private static void emit(final Appendable out,

  1518                              final String format,

  1519                              final CharSequence... params) throws IOException {

  1520         final int length = format.length();

  1521 

  1522         int processed = 0;

  1523         int paramOffset = format.indexOf('@');

  1524         while ((paramOffset != -1) && (paramOffset < (length - 1))) {

  1525             final char paramChar = format.charAt(paramOffset + 1);

  1526             if ((paramChar >= '1') && (paramChar <= '9')) {

  1527                 final int paramIndex = paramChar - '0' - 1;

  1528 

  1529                 out.append(format, processed, paramOffset);

  1530                 out.append(params[paramIndex]);

  1531 

  1532                 ++paramOffset;

  1533                 processed = paramOffset + 1;

  1534             }

  1535 

  1536             paramOffset = format.indexOf('@', paramOffset + 1);

  1537         }

  1538 

  1539         out.append(format, processed, length);

  1540     }

  1541 }
hg/bck2brwsr