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vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
Thu, 03 Jan 2013 11:20:40 +0100
branchTypeNickNames
changeset 405 e41809be6106
parent 401 a9be982d9b9c
child 406 2670f519a46d
permissions -rw-r--r--
Using 's' instead of Ljava_lang_String_2 
     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.bck2brwsr.core.JavaScriptBody;

    23 import org.apidesign.javap.AnnotationParser;

    24 import org.apidesign.javap.ClassData;

    25 import org.apidesign.javap.FieldData;

    26 import org.apidesign.javap.MethodData;

    27 import org.apidesign.javap.StackMapIterator;

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

    29 import org.apidesign.javap.TrapData;

    30 import org.apidesign.javap.TrapDataIterator;

    31 

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

    33  *

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

    35  */

    36 abstract class ByteCodeToJavaScript {

    37     private ClassData jc;

    38     final Appendable out;

    39 

    40     protected ByteCodeToJavaScript(Appendable out) {

    41         this.out = out;

    42     }

    43     

    44     /* Collects additional required resources.

    45      * 

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

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

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

    49      */

    50     protected abstract boolean requireReference(String internalClassName);

    51     

    52     /*

    53      * @param resourcePath name of resources to read

    54      */

    55     protected abstract void requireScript(String resourcePath);

    56     

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

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

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

    60      * 

    61      * @param className suggested name of the class

    62      */

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

    64         return className + " = ";

    65     }

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

    67         return classOperation;

    68     }

    69     

    70     /** Prints out a debug message. 

    71      * 

    72      * @param msg the message

    73      * @return true if the message has been printed

    74      * @throws IOException 

    75      */

    76     boolean debug(String msg) throws IOException {

    77         out.append(msg);

    78         return true;

    79     }

    80 

    81     /**

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

    83      *

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

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

    86      * 

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

    88      */

    89     

    90     public String compile(InputStream classFile) throws IOException {

    91         this.jc = new ClassData(classFile);

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

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

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

    95             );

    96         }

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

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

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

   100             "resource", "processByteCode"

   101         );

   102         if (arr != null) {

   103             requireScript(arr[0]);

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

   105                 return null;

   106             }

   107         }

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

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

   110             "container", "prototype"

   111         );

   112         StringArray toInitilize = new StringArray();

   113         final String className = className(jc);

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

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

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

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

   118             if (v.isStatic()) {

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

   120             }

   121         }

   122         if (proto == null) {

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

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

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

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

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

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

   129         } else {

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

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

   132                 proto[0] = "p";

   133             }

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

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

   136         }

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

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

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

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

   141                 "name", "value"

   142             );

   143             if (only != null) {

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

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

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

   147                 }

   148                 continue;

   149             }

   150             String prefix;

   151             String mn;

   152             if (m.isStatic()) {

   153                 prefix = "\n    c.";

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

   155             } else {

   156                 if (m.isConstructor()) {

   157                     prefix = "\n    CLS.";

   158                     mn = generateInstanceMethod(prefix, m);

   159                 } else {

   160                     prefix = "\n    c.";

   161                     mn = generateInstanceMethod(prefix, m);

   162                 }

   163             }

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

   165             if (runAnno != null) {

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

   167                 generateAnno(jc, out, runAnno);

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

   169             }

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

   171         }

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

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

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

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

   176         }

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

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

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

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

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

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

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

   184         if (classAnno != null) {

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

   186             generateAnno(jc, out, classAnno);

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

   188         }

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

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

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

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

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

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

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

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

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

   198                 "name", "value"

   199             );

   200             if (only != null) {

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

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

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

   204                 }

   205                 continue;

   206             }

   207             if (!v.isStatic()) {

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

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

   210             }

   211         }

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

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

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

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

   216         StringBuilder sb = new StringBuilder();

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

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

   219         }

   220         return sb.toString();

   221     }

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

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

   224         if (jsb != null) {

   225             return jsb;

   226         }

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

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

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

   230         }

   231         generateMethod(prefix, mn, m);

   232         return mn;

   233     }

   234 

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

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

   237         if (jsb != null) {

   238             return jsb;

   239         }

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

   241         generateMethod(prefix, mn, m);

   242         return mn;

   243     }

   244 

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

   246             throws IOException {

   247         final StackMapIterator stackMapIterator = m.createStackMapIterator();

   248         TrapDataIterator trap = m.getTrapDataIterator();

   249         final LocalsMapper lmapper =

   250                 new LocalsMapper(stackMapIterator.getArguments());

   251 

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

   253         lmapper.outputArguments(out);

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

   255 

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

   257         if (byteCodes == null) {

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

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

   260             out.append("};");

   261             return;

   262         }

   263 

   264         final StackMapper smapper = new StackMapper();

   265 

   266         final int maxLocals = m.getMaxLocals();

   267         if (maxLocals > 0) {

   268             // TODO: generate only used local variables

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

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

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

   272                     out.append(", ");

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

   274                 }

   275                 out.append(';');

   276             }

   277         }

   278 

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

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

   281         final int maxStack = m.getMaxStack();

   282         if (maxStack > 0) {

   283             // TODO: generate only used stack variables

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

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

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

   287                     out.append(", ");

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

   289                 }

   290                 out.append(';');

   291             }

   292         }

   293 

   294         int lastStackFrame = -1;

   295         TrapData[] previousTrap = null;

   296         

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

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

   299             int prev = i;

   300             stackMapIterator.advanceTo(i);

   301             boolean changeInCatch = trap.advanceTo(i);

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

   303                 if (previousTrap != null) {

   304                     generateCatch(previousTrap);

   305                     previousTrap = null;

   306                 }

   307             }

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

   309                 lastStackFrame = stackMapIterator.getFrameIndex();

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

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

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

   313                 changeInCatch = true;

   314             } else {

   315                 debug("    /* " + i + " */ ");

   316             }

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

   318                 out.append("try {");

   319                 previousTrap = trap.current();

   320             }

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

   322             switch (c) {

   323                 case opc_aload_0:

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

   325                     break;

   326                 case opc_iload_0:

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

   328                     break;

   329                 case opc_lload_0:

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

   331                     break;

   332                 case opc_fload_0:

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

   334                     break;

   335                 case opc_dload_0:

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

   337                     break;

   338                 case opc_aload_1:

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

   340                     break;

   341                 case opc_iload_1:

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

   343                     break;

   344                 case opc_lload_1:

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

   346                     break;

   347                 case opc_fload_1:

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

   349                     break;

   350                 case opc_dload_1:

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

   352                     break;

   353                 case opc_aload_2:

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

   355                     break;

   356                 case opc_iload_2:

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

   358                     break;

   359                 case opc_lload_2:

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

   361                     break;

   362                 case opc_fload_2:

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

   364                     break;

   365                 case opc_dload_2:

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

   367                     break;

   368                 case opc_aload_3:

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

   370                     break;

   371                 case opc_iload_3:

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

   373                     break;

   374                 case opc_lload_3:

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

   376                     break;

   377                 case opc_fload_3:

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

   379                     break;

   380                 case opc_dload_3:

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

   382                     break;

   383                 case opc_iload: {

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

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

   386                     break;

   387                 }

   388                 case opc_lload: {

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

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

   391                     break;

   392                 }

   393                 case opc_fload: {

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

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

   396                     break;

   397                 }

   398                 case opc_dload: {

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

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

   401                     break;

   402                 }

   403                 case opc_aload: {

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

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

   406                     break;

   407                 }

   408                 case opc_istore: {

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

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

   411                     break;

   412                 }

   413                 case opc_lstore: {

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

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

   416                     break;

   417                 }

   418                 case opc_fstore: {

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

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

   421                     break;

   422                 }

   423                 case opc_dstore: {

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

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

   426                     break;

   427                 }

   428                 case opc_astore: {

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

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

   431                     break;

   432                 }

   433                 case opc_astore_0:

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

   435                     break;

   436                 case opc_istore_0:

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

   438                     break;

   439                 case opc_lstore_0:

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

   441                     break;

   442                 case opc_fstore_0:

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

   444                     break;

   445                 case opc_dstore_0:

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

   447                     break;

   448                 case opc_astore_1:

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

   450                     break;

   451                 case opc_istore_1:

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

   453                     break;

   454                 case opc_lstore_1:

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

   456                     break;

   457                 case opc_fstore_1:

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

   459                     break;

   460                 case opc_dstore_1:

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

   462                     break;

   463                 case opc_astore_2:

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

   465                     break;

   466                 case opc_istore_2:

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

   468                     break;

   469                 case opc_lstore_2:

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

   471                     break;

   472                 case opc_fstore_2:

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

   474                     break;

   475                 case opc_dstore_2:

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

   477                     break;

   478                 case opc_astore_3:

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

   480                     break;

   481                 case opc_istore_3:

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

   483                     break;

   484                 case opc_lstore_3:

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

   486                     break;

   487                 case opc_fstore_3:

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

   489                     break;

   490                 case opc_dstore_3:

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

   492                     break;

   493                 case opc_iadd:

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

   495                     break;

   496                 case opc_ladd:

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

   498                     break;

   499                 case opc_fadd:

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

   501                     break;

   502                 case opc_dadd:

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

   504                     break;

   505                 case opc_isub:

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

   507                     break;

   508                 case opc_lsub:

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

   510                     break;

   511                 case opc_fsub:

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

   513                     break;

   514                 case opc_dsub:

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

   516                     break;

   517                 case opc_imul:

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

   519                     break;

   520                 case opc_lmul:

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

   522                     break;

   523                 case opc_fmul:

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

   525                     break;

   526                 case opc_dmul:

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

   528                     break;

   529                 case opc_idiv:

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

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

   532                     break;

   533                 case opc_ldiv:

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

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

   536                     break;

   537                 case opc_fdiv:

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

   539                     break;

   540                 case opc_ddiv:

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

   542                     break;

   543                 case opc_irem:

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

   545                     break;

   546                 case opc_lrem:

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

   548                     break;

   549                 case opc_frem:

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

   551                     break;

   552                 case opc_drem:

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

   554                     break;

   555                 case opc_iand:

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

   557                     break;

   558                 case opc_land:

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

   560                     break;

   561                 case opc_ior:

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

   563                     break;

   564                 case opc_lor:

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

   566                     break;

   567                 case opc_ixor:

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

   569                     break;

   570                 case opc_lxor:

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

   572                     break;

   573                 case opc_ineg:

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

   575                     break;

   576                 case opc_lneg:

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

   578                     break;

   579                 case opc_fneg:

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

   581                     break;

   582                 case opc_dneg:

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

   584                     break;

   585                 case opc_ishl:

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

   587                     break;

   588                 case opc_lshl:

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

   590                     break;

   591                 case opc_ishr:

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

   593                     break;

   594                 case opc_lshr:

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

   596                     break;

   597                 case opc_iushr:

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

   599                     break;

   600                 case opc_lushr:

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

   602                     break;

   603                 case opc_iinc: {

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

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

   606                     if (incrBy == 1) {

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

   608                     } else {

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

   610                              lmapper.getI(varIndx),

   611                              Integer.toString(incrBy));

   612                     }

   613                     break;

   614                 }

   615                 case opc_return:

   616                     emit(out, "return;");

   617                     break;

   618                 case opc_ireturn:

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

   620                     break;

   621                 case opc_lreturn:

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

   623                     break;

   624                 case opc_freturn:

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

   626                     break;

   627                 case opc_dreturn:

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

   629                     break;

   630                 case opc_areturn:

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

   632                     break;

   633                 case opc_i2l:

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

   635                     break;

   636                 case opc_i2f:

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

   638                     break;

   639                 case opc_i2d:

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

   641                     break;

   642                 case opc_l2i:

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

   644                     break;

   645                     // max int check?

   646                 case opc_l2f:

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

   648                     break;

   649                 case opc_l2d:

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

   651                     break;

   652                 case opc_f2d:

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

   654                     break;

   655                 case opc_d2f:

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

   657                     break;

   658                 case opc_f2i:

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

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

   661                     break;

   662                 case opc_f2l:

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

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

   665                     break;

   666                 case opc_d2i:

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

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

   669                     break;

   670                 case opc_d2l:

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

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

   673                     break;

   674                 case opc_i2b:

   675                 case opc_i2c:

   676                 case opc_i2s:

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

   678                     break;

   679                 case opc_aconst_null:

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

   681                     break;

   682                 case opc_iconst_m1:

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

   684                     break;

   685                 case opc_iconst_0:

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

   687                     break;

   688                 case opc_dconst_0:

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

   690                     break;

   691                 case opc_lconst_0:

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

   693                     break;

   694                 case opc_fconst_0:

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

   696                     break;

   697                 case opc_iconst_1:

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

   699                     break;

   700                 case opc_lconst_1:

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

   702                     break;

   703                 case opc_fconst_1:

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

   705                     break;

   706                 case opc_dconst_1:

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

   708                     break;

   709                 case opc_iconst_2:

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

   711                     break;

   712                 case opc_fconst_2:

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

   714                     break;

   715                 case opc_iconst_3:

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

   717                     break;

   718                 case opc_iconst_4:

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

   720                     break;

   721                 case opc_iconst_5:

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

   723                     break;

   724                 case opc_ldc: {

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

   726                     String v = encodeConstant(indx);

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

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

   729                     break;

   730                 }

   731                 case opc_ldc_w:

   732                 case opc_ldc2_w: {

   733                     int indx = readIntArg(byteCodes, i);

   734                     i += 2;

   735                     String v = encodeConstant(indx);

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

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

   738                     break;

   739                 }

   740                 case opc_lcmp:

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

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

   743                     break;

   744                 case opc_fcmpl:

   745                 case opc_fcmpg:

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

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

   748                     break;

   749                 case opc_dcmpl:

   750                 case opc_dcmpg:

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

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

   753                     break;

   754                 case opc_if_acmpeq:

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

   756                                    "===");

   757                     break;

   758                 case opc_if_acmpne:

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

   760                                    "!=");

   761                     break;

   762                 case opc_if_icmpeq:

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

   764                                    "==");

   765                     break;

   766                 case opc_ifeq: {

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

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

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

   770                     i += 2;

   771                     break;

   772                 }

   773                 case opc_ifne: {

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

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

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

   777                     i += 2;

   778                     break;

   779                 }

   780                 case opc_iflt: {

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

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

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

   784                     i += 2;

   785                     break;

   786                 }

   787                 case opc_ifle: {

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

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

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

   791                     i += 2;

   792                     break;

   793                 }

   794                 case opc_ifgt: {

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

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

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

   798                     i += 2;

   799                     break;

   800                 }

   801                 case opc_ifge: {

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

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

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

   805                     i += 2;

   806                     break;

   807                 }

   808                 case opc_ifnonnull: {

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

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

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

   812                     i += 2;

   813                     break;

   814                 }

   815                 case opc_ifnull: {

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

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

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

   819                     i += 2;

   820                     break;

   821                 }

   822                 case opc_if_icmpne:

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

   824                                    "!=");

   825                     break;

   826                 case opc_if_icmplt:

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

   828                                    "<");

   829                     break;

   830                 case opc_if_icmple:

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

   832                                    "<=");

   833                     break;

   834                 case opc_if_icmpgt:

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

   836                                    ">");

   837                     break;

   838                 case opc_if_icmpge:

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

   840                                    ">=");

   841                     break;

   842                 case opc_goto: {

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

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

   845                     i += 2;

   846                     break;

   847                 }

   848                 case opc_lookupswitch: {

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

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

   851                     table += 4;

   852                     int n = readInt4(byteCodes, table);

   853                     table += 4;

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

   855                     while (n-- > 0) {

   856                         int cnstnt = readInt4(byteCodes, table);

   857                         table += 4;

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

   859                         table += 4;

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

   861                     }

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

   863                     i = table - 1;

   864                     break;

   865                 }

   866                 case opc_tableswitch: {

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

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

   869                     table += 4;

   870                     int low = readInt4(byteCodes, table);

   871                     table += 4;

   872                     int high = readInt4(byteCodes, table);

   873                     table += 4;

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

   875                     while (low <= high) {

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

   877                         table += 4;

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

   879                         low++;

   880                     }

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

   882                     i = table - 1;

   883                     break;

   884                 }

   885                 case opc_invokeinterface: {

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

   887                     break;

   888                 }

   889                 case opc_invokevirtual:

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

   891                     break;

   892                 case opc_invokespecial:

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

   894                     break;

   895                 case opc_invokestatic:

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

   897                     break;

   898                 case opc_new: {

   899                     int indx = readIntArg(byteCodes, i);

   900                     String ci = jc.getClassName(indx);

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

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

   903                     addReference(ci);

   904                     i += 2;

   905                     break;

   906                 }

   907                 case opc_newarray:

   908                     ++i; // skip type of array

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

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

   911                     break;

   912                 case opc_anewarray:

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

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

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

   916                     break;

   917                 case opc_multianewarray: {

   918                     i += 2;

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

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

   921                        .append(").fillNulls();");

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

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

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

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

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

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

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

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

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

   931                             append(";");

   932                     }

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

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

   935                     }

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

   937                     break;

   938                 }

   939                 case opc_arraylength:

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

   941                     break;

   942                 case opc_lastore:

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

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

   945                     break;

   946                 case opc_fastore:

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

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

   949                     break;

   950                 case opc_dastore:

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

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

   953                     break;

   954                 case opc_aastore:

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

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

   957                     break;

   958                 case opc_iastore:

   959                 case opc_bastore:

   960                 case opc_castore:

   961                 case opc_sastore:

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

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

   964                     break;

   965                 case opc_laload:

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

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

   968                     break;

   969                 case opc_faload:

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

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

   972                     break;

   973                 case opc_daload:

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

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

   976                     break;

   977                 case opc_aaload:

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

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

   980                     break;

   981                 case opc_iaload:

   982                 case opc_baload:

   983                 case opc_caload:

   984                 case opc_saload:

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

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

   987                     break;

   988                 case opc_pop:

   989                 case opc_pop2:

   990                     smapper.pop(1);

   991                     debug("/* pop */");

   992                     break;

   993                 case opc_dup: {

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

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

   996                     break;

   997                 }

   998                 case opc_dup2: {

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

  1000                         final Variable v = smapper.get(0);

  1001                         emit(out, "@1 = @2;", smapper.pushT(v.getType()), v);

  1002                     } else {

  1003                         final Variable v1 = smapper.get(0);

  1004                         final Variable v2 = smapper.get(1);

  1005                         emit(out, "{ @1 = @2; @3 = @4; }",

  1006                              smapper.pushT(v2.getType()), v2,

  1007                              smapper.pushT(v1.getType()), v1);

  1008                     }

  1009                     break;

  1010                 }

  1011                 case opc_dup_x1: {

  1012                     final Variable vi1 = smapper.pop();

  1013                     final Variable vi2 = smapper.pop();

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

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

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

  1017 

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

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

  1020                     break;

  1021                 }

  1022                 case opc_dup_x2: {

  1023                     if (smapper.get(1).isCategory2()) {

  1024                         final Variable vi1 = smapper.pop();

  1025                         final Variable vi2 = smapper.pop();

  1026                         final Variable vo3 = smapper.pushT(vi1.getType());

  1027                         final Variable vo2 = smapper.pushT(vi2.getType());

  1028                         final Variable vo1 = smapper.pushT(vi1.getType());

  1029 

  1030                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; }",

  1031                              vo1, vi1, vo2, vi2, vo3, vo1);

  1032                     } else {

  1033                         final Variable vi1 = smapper.pop();

  1034                         final Variable vi2 = smapper.pop();

  1035                         final Variable vi3 = smapper.pop();

  1036                         final Variable vo4 = smapper.pushT(vi1.getType());

  1037                         final Variable vo3 = smapper.pushT(vi3.getType());

  1038                         final Variable vo2 = smapper.pushT(vi2.getType());

  1039                         final Variable vo1 = smapper.pushT(vi1.getType());

  1040 

  1041                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; @7 = @8; }",

  1042                              vo1, vi1, vo2, vi2, vo3, vi3, vo4, vo1);

  1043                     }

  1044                     break;

  1045                 }

  1046                 case opc_bipush:

  1047                     emit(out, "@1 = @2;",

  1048                          smapper.pushI(), Integer.toString(byteCodes[++i]));

  1049                     break;

  1050                 case opc_sipush:

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

  1052                          smapper.pushI(),

  1053                          Integer.toString(readIntArg(byteCodes, i)));

  1054                     i += 2;

  1055                     break;

  1056                 case opc_getfield: {

  1057                     int indx = readIntArg(byteCodes, i);

  1058                     String[] fi = jc.getFieldInfoName(indx);

  1059                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1060                     emit(out, "@2 = @1.fld_@3;",

  1061                          smapper.popA(), smapper.pushT(type), fi[1]);

  1062                     i += 2;

  1063                     break;

  1064                 }

  1065                 case opc_getstatic: {

  1066                     int indx = readIntArg(byteCodes, i);

  1067                     String[] fi = jc.getFieldInfoName(indx);

  1068                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1069                     emit(out, "@1 = @2(false).constructor.@3;",

  1070                          smapper.pushT(type),

  1071                          accessClass(fi[0].replace('/', '_')), fi[1]);

  1072                     i += 2;

  1073                     addReference(fi[0]);

  1074                     break;

  1075                 }

  1076                 case opc_putfield: {

  1077                     int indx = readIntArg(byteCodes, i);

  1078                     String[] fi = jc.getFieldInfoName(indx);

  1079                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1080                     emit(out, "@2.fld_@3 = @1;",

  1081                          smapper.popT(type), smapper.popA(), fi[1]);

  1082                     i += 2;

  1083                     break;

  1084                 }

  1085                 case opc_putstatic: {

  1086                     int indx = readIntArg(byteCodes, i);

  1087                     String[] fi = jc.getFieldInfoName(indx);

  1088                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1089                     emit(out, "@1(false).constructor.@2 = @3;",

  1090                          accessClass(fi[0].replace('/', '_')), fi[1],

  1091                          smapper.popT(type));

  1092                     i += 2;

  1093                     addReference(fi[0]);

  1094                     break;

  1095                 }

  1096                 case opc_checkcast: {

  1097                     int indx = readIntArg(byteCodes, i);

  1098                     final String type = jc.getClassName(indx);

  1099                     if (!type.startsWith("[")) {

  1100                         // no way to check arrays right now

  1101                         // XXX proper exception

  1102                         emit(out,

  1103                              "if (@1 !== null && !@1.$instOf_@2) throw {};",

  1104                              smapper.getA(0), type.replace('/', '_'));

  1105                     }

  1106                     i += 2;

  1107                     break;

  1108                 }

  1109                 case opc_instanceof: {

  1110                     int indx = readIntArg(byteCodes, i);

  1111                     final String type = jc.getClassName(indx);

  1112                     emit(out, "@2 = @1.$instOf_@3 ? 1 : 0;",

  1113                          smapper.popA(), smapper.pushI(),

  1114                          type.replace('/', '_'));

  1115                     i += 2;

  1116                     break;

  1117                 }

  1118                 case opc_athrow: {

  1119                     final Variable v = smapper.popA();

  1120                     smapper.clear();

  1121 

  1122                     emit(out, "{ @1 = @2; throw @2; }",

  1123                          smapper.pushA(), v);

  1124                     break;

  1125                 }

  1126 

  1127                 case opc_monitorenter: {

  1128                     out.append("/* monitor enter */");

  1129                     smapper.popA();

  1130                     break;

  1131                 }

  1132 

  1133                 case opc_monitorexit: {

  1134                     out.append("/* monitor exit */");

  1135                     smapper.popA();

  1136                     break;

  1137                 }

  1138 

  1139                 default: {

  1140                     emit(out, "throw 'unknown bytecode @1';",

  1141                          Integer.toString(c));

  1142                 }

  1143             }

  1144             if (debug(" //")) {

  1145                 for (int j = prev; j <= i; j++) {

  1146                     out.append(" ");

  1147                     final int cc = readByte(byteCodes, j);

  1148                     out.append(Integer.toString(cc));

  1149                 }

  1150             }

  1151             out.append("\n");            

  1152         }

  1153         if (previousTrap != null) {

  1154             generateCatch(previousTrap);

  1155         }

  1156         out.append("  }\n");

  1157         out.append("};");

  1158     }

  1159 

  1160     private int generateIf(byte[] byteCodes, int i,

  1161                            final Variable v2, final Variable v1,

  1162                            final String test) throws IOException {

  1163         int indx = i + readIntArg(byteCodes, i);

  1164         out.append("if (").append(v1)

  1165            .append(' ').append(test).append(' ')

  1166            .append(v2).append(") { gt = " + indx)

  1167            .append("; continue; }");

  1168         return i + 2;

  1169     }

  1170 

  1171     private int readIntArg(byte[] byteCodes, int offsetInstruction) {

  1172         final int indxHi = byteCodes[offsetInstruction + 1] << 8;

  1173         final int indxLo = byteCodes[offsetInstruction + 2];

  1174         return (indxHi & 0xffffff00) | (indxLo & 0xff);

  1175     }

  1176     private int readInt4(byte[] byteCodes, int offsetInstruction) {

  1177         final int d = byteCodes[offsetInstruction + 0] << 24;

  1178         final int c = byteCodes[offsetInstruction + 1] << 16;

  1179         final int b = byteCodes[offsetInstruction + 2] << 8;

  1180         final int a = byteCodes[offsetInstruction + 3];

  1181         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

  1182     }

  1183     private int readByte(byte[] byteCodes, int offsetInstruction) {

  1184         return byteCodes[offsetInstruction] & 0xff;

  1185     }

  1186     

  1187     private static void countArgs(String descriptor, char[] returnType, StringBuilder sig, StringBuilder cnt) {

  1188         int i = 0;

  1189         Boolean count = null;

  1190         boolean array = false;

  1191         sig.append("__");

  1192         int firstPos = sig.length();

  1193         while (i < descriptor.length()) {

  1194             char ch = descriptor.charAt(i++);

  1195             switch (ch) {

  1196                 case '(':

  1197                     count = true;

  1198                     continue;

  1199                 case ')':

  1200                     count = false;

  1201                     continue;

  1202                 case 'B': 

  1203                 case 'C': 

  1204                 case 'D': 

  1205                 case 'F': 

  1206                 case 'I': 

  1207                 case 'J': 

  1208                 case 'S': 

  1209                 case 'Z': 

  1210                     if (count) {

  1211                         if (array) {

  1212                             sig.append("_3");

  1213                         }

  1214                         sig.append(ch);

  1215                         if (ch == 'J' || ch == 'D') {

  1216                             cnt.append('1');

  1217                         } else {

  1218                             cnt.append('0');

  1219                         }

  1220                     } else {

  1221                         sig.insert(firstPos, ch);

  1222                         if (array) {

  1223                             returnType[0] = '[';

  1224                             sig.insert(firstPos, "_3");

  1225                         } else {

  1226                             returnType[0] = ch;

  1227                         }

  1228                     }

  1229                     array = false;

  1230                     continue;

  1231                 case 'V': 

  1232                     assert !count;

  1233                     returnType[0] = 'V';

  1234                     sig.insert(firstPos, 'V');

  1235                     continue;

  1236                 case 'L':

  1237                     int next = descriptor.indexOf(';', i);

  1238                     String realSig = mangleSig(descriptor, i - 1, next + 1);

  1239                     if (count) {

  1240                         if (array) {

  1241                             sig.append("_3");

  1242                         }

  1243                         sig.append(realSig);

  1244                         cnt.append('0');

  1245                     } else {

  1246                         sig.insert(firstPos, realSig);

  1247                         if (array) {

  1248                             sig.insert(firstPos, "_3");

  1249                         }

  1250                         returnType[0] = 'L';

  1251                     }

  1252                     i = next + 1;

  1253                     continue;

  1254                 case '[':

  1255                     array = true;

  1256                     continue;

  1257                 default:

  1258                     throw new IllegalStateException("Invalid char: " + ch);

  1259             }

  1260         }

  1261     }

  1262     

  1263     private static String mangleSig(String txt, int first, int last) {

  1264         StringBuilder sb = new StringBuilder();

  1265         for (int i = first; i < last; i++) {

  1266             final char ch = txt.charAt(i);

  1267             switch (ch) {

  1268                 case '/': sb.append('_'); break;

  1269                 case '_': sb.append("_1"); break;

  1270                 case ';': sb.append("_2"); break;

  1271                 case '[': sb.append("_3"); break;

  1272                 default: sb.append(ch); break;

  1273             }

  1274         }

  1275         final String strng = "Ljava_lang_String_2";

  1276         for(;;) {

  1277             int pos = sb.indexOf(strng);

  1278             if (pos == -1) {

  1279                 break;

  1280             }

  1281             sb.delete(pos, pos + strng.length());

  1282             sb.insert(pos, 's');

  1283         }

  1284         return sb.toString();

  1285     }

  1286     

  1287     private static String findMethodName(MethodData m, StringBuilder cnt) {

  1288         StringBuilder name = new StringBuilder();

  1289         if ("<init>".equals(m.getName())) { // NOI18N

  1290             name.append("cons"); // NOI18N

  1291         } else if ("<clinit>".equals(m.getName())) { // NOI18N

  1292             name.append("class"); // NOI18N

  1293         } else {

  1294             name.append(m.getName());

  1295         } 

  1296         

  1297         countArgs(m.getInternalSig(), new char[1], name, cnt);

  1298         return name.toString();

  1299     }

  1300 

  1301     static String findMethodName(String[] mi, StringBuilder cnt, char[] returnType) {

  1302         StringBuilder name = new StringBuilder();

  1303         String descr = mi[2];//mi.getDescriptor();

  1304         String nm= mi[1];

  1305         if ("<init>".equals(nm)) { // NOI18N

  1306             name.append("cons"); // NOI18N

  1307         } else {

  1308             name.append(nm);

  1309         }

  1310         countArgs(descr, returnType, name, cnt);

  1311         return name.toString();

  1312     }

  1313 

  1314     private int invokeStaticMethod(byte[] byteCodes, int i, final StackMapper mapper, boolean isStatic)

  1315     throws IOException {

  1316         int methodIndex = readIntArg(byteCodes, i);

  1317         String[] mi = jc.getFieldInfoName(methodIndex);

  1318         char[] returnType = { 'V' };

  1319         StringBuilder cnt = new StringBuilder();

  1320         String mn = findMethodName(mi, cnt, returnType);

  1321 

  1322         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1323         final Variable[] vars = new Variable[numArguments];

  1324 

  1325         for (int j = numArguments - 1; j >= 0; --j) {

  1326             vars[j] = mapper.pop();

  1327         }

  1328 

  1329         if (returnType[0] != 'V') {

  1330             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1331                .append(" = ");

  1332         }

  1333 

  1334         final String in = mi[0];

  1335         out.append(accessClass(in.replace('/', '_')));

  1336         out.append("(false).");

  1337         if (mn.startsWith("cons_")) {

  1338             out.append("constructor.");

  1339         }

  1340         out.append(mn);

  1341         out.append('(');

  1342         if (numArguments > 0) {

  1343             out.append(vars[0]);

  1344             for (int j = 1; j < numArguments; ++j) {

  1345                 out.append(", ");

  1346                 out.append(vars[j]);

  1347             }

  1348         }

  1349         out.append(");");

  1350         i += 2;

  1351         addReference(in);

  1352         return i;

  1353     }

  1354     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackMapper mapper)

  1355     throws IOException {

  1356         int methodIndex = readIntArg(byteCodes, i);

  1357         String[] mi = jc.getFieldInfoName(methodIndex);

  1358         char[] returnType = { 'V' };

  1359         StringBuilder cnt = new StringBuilder();

  1360         String mn = findMethodName(mi, cnt, returnType);

  1361 

  1362         final int numArguments = cnt.length() + 1;

  1363         final Variable[] vars = new Variable[numArguments];

  1364 

  1365         for (int j = numArguments - 1; j >= 0; --j) {

  1366             vars[j] = mapper.pop();

  1367         }

  1368 

  1369         if (returnType[0] != 'V') {

  1370             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1371                .append(" = ");

  1372         }

  1373 

  1374         out.append(vars[0]).append('.');

  1375         out.append(mn);

  1376         out.append('(');

  1377         out.append(vars[0]);

  1378         for (int j = 1; j < numArguments; ++j) {

  1379             out.append(", ");

  1380             out.append(vars[j]);

  1381         }

  1382         out.append(");");

  1383         i += 2;

  1384         return i;

  1385     }

  1386 

  1387     private void addReference(String cn) throws IOException {

  1388         if (requireReference(cn)) {

  1389             debug(" /* needs " + cn + " */");

  1390         }

  1391     }

  1392 

  1393     private void outType(String d, StringBuilder out) {

  1394         int arr = 0;

  1395         while (d.charAt(0) == '[') {

  1396             out.append('A');

  1397             d = d.substring(1);

  1398         }

  1399         if (d.charAt(0) == 'L') {

  1400             assert d.charAt(d.length() - 1) == ';';

  1401             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1402         } else {

  1403             out.append(d);

  1404         }

  1405     }

  1406 

  1407     private String encodeConstant(int entryIndex) throws IOException {

  1408         String[] classRef = { null };

  1409         String s = jc.stringValue(entryIndex, classRef);

  1410         if (classRef[0] != null) {

  1411             addReference(classRef[0]);

  1412             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1413         }

  1414         return s;

  1415     }

  1416 

  1417     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1418         byte[] arr = m.findAnnotationData(true);

  1419         if (arr == null) {

  1420             return null;

  1421         }

  1422         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1423         class P extends AnnotationParser {

  1424             public P() {

  1425                 super(false);

  1426             }

  1427             

  1428             int cnt;

  1429             String[] args = new String[30];

  1430             String body;

  1431             

  1432             @Override

  1433             protected void visitAttr(String type, String attr, String at, String value) {

  1434                 if (type.equals(jvmType)) {

  1435                     if ("body".equals(attr)) {

  1436                         body = value;

  1437                     } else if ("args".equals(attr)) {

  1438                         args[cnt++] = value;

  1439                     } else {

  1440                         throw new IllegalArgumentException(attr);

  1441                     }

  1442                 }

  1443             }

  1444         }

  1445         P p = new P();

  1446         p.parse(arr, jc);

  1447         if (p.body == null) {

  1448             return null;

  1449         }

  1450         StringBuilder cnt = new StringBuilder();

  1451         final String mn = findMethodName(m, cnt);

  1452         out.append(prefix).append(mn);

  1453         out.append(" = function(");

  1454         String space;

  1455         int index;

  1456         if (!isStatic) {                

  1457             space = outputArg(out, p.args, 0);

  1458             index = 1;

  1459         } else {

  1460             space = "";

  1461             index = 0;

  1462         }

  1463         for (int i = 0; i < cnt.length(); i++) {

  1464             out.append(space);

  1465             space = outputArg(out, p.args, index);

  1466             index++;

  1467         }

  1468         out.append(") {").append("\n");

  1469         out.append(p.body);

  1470         out.append("\n}\n");

  1471         return mn;

  1472     }

  1473     private static String className(ClassData jc) {

  1474         //return jc.getName().getInternalName().replace('/', '_');

  1475         return jc.getClassName().replace('/', '_');

  1476     }

  1477     

  1478     private static String[] findAnnotation(

  1479         byte[] arr, ClassData cd, final String className, 

  1480         final String... attrNames

  1481     ) throws IOException {

  1482         if (arr == null) {

  1483             return null;

  1484         }

  1485         final String[] values = new String[attrNames.length];

  1486         final boolean[] found = { false };

  1487         final String jvmType = "L" + className.replace('.', '/') + ";";

  1488         AnnotationParser ap = new AnnotationParser(false) {

  1489             @Override

  1490             protected void visitAttr(String type, String attr, String at, String value) {

  1491                 if (type.equals(jvmType)) {

  1492                     found[0] = true;

  1493                     for (int i = 0; i < attrNames.length; i++) {

  1494                         if (attrNames[i].equals(attr)) {

  1495                             values[i] = value;

  1496                         }

  1497                     }

  1498                 }

  1499             }

  1500             

  1501         };

  1502         ap.parse(arr, cd);

  1503         return found[0] ? values : null;

  1504     }

  1505 

  1506     private CharSequence initField(FieldData v) {

  1507         final String is = v.getInternalSig();

  1508         if (is.length() == 1) {

  1509             switch (is.charAt(0)) {

  1510                 case 'S':

  1511                 case 'J':

  1512                 case 'B':

  1513                 case 'Z':

  1514                 case 'C':

  1515                 case 'I': return " = 0;";

  1516                 case 'F': 

  1517                 case 'D': return " = 0.0;";

  1518                 default:

  1519                     throw new IllegalStateException(is);

  1520             }

  1521         }

  1522         return " = null;";

  1523     }

  1524 

  1525     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1526         AnnotationParser ap = new AnnotationParser(true) {

  1527             int anno;

  1528             int cnt;

  1529             

  1530             @Override

  1531             protected void visitAnnotationStart(String type) throws IOException {

  1532                 if (anno++ > 0) {

  1533                     out.append(",");

  1534                 }

  1535                 out.append('"').append(type).append("\" : {\n");

  1536                 cnt = 0;

  1537             }

  1538 

  1539             @Override

  1540             protected void visitAnnotationEnd(String type) throws IOException {

  1541                 out.append("\n}\n");

  1542             }

  1543             

  1544             @Override

  1545             protected void visitAttr(String type, String attr, String attrType, String value) 

  1546             throws IOException {

  1547                 if (attr == null) {

  1548                     return;

  1549                 }

  1550                 if (cnt++ > 0) {

  1551                     out.append(",\n");

  1552                 }

  1553                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1554             }

  1555         };

  1556         ap.parse(data, cd);

  1557     }

  1558 

  1559     private static String outputArg(Appendable out, String[] args, int indx) throws IOException {

  1560         final String name = args[indx];

  1561         if (name == null) {

  1562             return "";

  1563         }

  1564         if (name.contains(",")) {

  1565             throw new IOException("Wrong parameter with ',': " + name);

  1566         }

  1567         out.append(name);

  1568         return ",";

  1569     }

  1570 

  1571     private static void emit(final Appendable out,

  1572                              final String format,

  1573                              final CharSequence... params) throws IOException {

  1574         final int length = format.length();

  1575 

  1576         int processed = 0;

  1577         int paramOffset = format.indexOf('@');

  1578         while ((paramOffset != -1) && (paramOffset < (length - 1))) {

  1579             final char paramChar = format.charAt(paramOffset + 1);

  1580             if ((paramChar >= '1') && (paramChar <= '9')) {

  1581                 final int paramIndex = paramChar - '0' - 1;

  1582 

  1583                 out.append(format, processed, paramOffset);

  1584                 out.append(params[paramIndex]);

  1585 

  1586                 ++paramOffset;

  1587                 processed = paramOffset + 1;

  1588             }

  1589 

  1590             paramOffset = format.indexOf('@', paramOffset + 1);

  1591         }

  1592 

  1593         out.append(format, processed, length);

  1594     }

  1595 

  1596     private void generateCatch(TrapData[] traps) throws IOException {

  1597         out.append("} catch (e) {\n");

  1598         int finallyPC = -1;

  1599         for (TrapData e : traps) {

  1600             if (e == null) {

  1601                 break;

  1602             }

  1603             if (e.catch_cpx != 0) { //not finally

  1604                 final String classInternalName = jc.getClassName(e.catch_cpx);

  1605                 addReference(classInternalName);

  1606                 out.append("if (e.$instOf_" + classInternalName.replace('/', '_') + ") {");

  1607                 out.append("gt=" + e.handler_pc + "; stA0 = e; continue;");

  1608                 out.append("}\n");

  1609             } else {

  1610                 finallyPC = e.handler_pc;

  1611             }

  1612         }

  1613         if (finallyPC == -1) {

  1614             out.append("throw e;");

  1615         } else {

  1616             out.append("gt=" + finallyPC + "; stA0 = e; continue;");

  1617         }

  1618         out.append("\n}");

  1619     }

  1620 }
hg/bck2brwsr