Mercurialhg/bck2brwsr / file revision
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | raw | help
vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
Thu, 03 Jan 2013 11:29:22 +0100
branchTypeNickNames
changeset 406 2670f519a46d
parent 405 e41809be6106
permissions -rw-r--r--
Using 'o' instead of full name of java.lang.Object 
     1 /**

     2  * Back 2 Browser Bytecode Translator

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

     4  *

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

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

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

     8  *

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

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

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

    12  * GNU General Public License for more details.

    13  *

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

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

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

    17  */

    18 package org.apidesign.vm4brwsr;

    19 

    20 import java.io.IOException;

    21 import java.io.InputStream;

    22 import org.apidesign.javap.AnnotationParser;

    23 import org.apidesign.javap.ClassData;

    24 import org.apidesign.javap.FieldData;

    25 import org.apidesign.javap.MethodData;

    26 import org.apidesign.javap.StackMapIterator;

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

    28 import org.apidesign.javap.TrapData;

    29 import org.apidesign.javap.TrapDataIterator;

    30 

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

    32  *

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

    34  */

    35 abstract class ByteCodeToJavaScript {

    36     private ClassData jc;

    37     final Appendable out;

    38 

    39     protected ByteCodeToJavaScript(Appendable out) {

    40         this.out = out;

    41     }

    42     

    43     /* Collects additional required resources.

    44      * 

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

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

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

    48      */

    49     protected abstract boolean requireReference(String internalClassName);

    50     

    51     /*

    52      * @param resourcePath name of resources to read

    53      */

    54     protected abstract void requireScript(String resourcePath);

    55     

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

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

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

    59      * 

    60      * @param className suggested name of the class

    61      */

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

    63         return className + " = ";

    64     }

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

    66         return classOperation;

    67     }

    68     

    69     /** Prints out a debug message. 

    70      * 

    71      * @param msg the message

    72      * @return true if the message has been printed

    73      * @throws IOException 

    74      */

    75     boolean debug(String msg) throws IOException {

    76         out.append(msg);

    77         return true;

    78     }

    79 

    80     /**

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

    82      *

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

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

    85      * 

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

    87      */

    88     

    89     public String compile(InputStream classFile) throws IOException {

    90         this.jc = new ClassData(classFile);

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

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

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

    94             );

    95         }

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

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

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

    99             "resource", "processByteCode"

   100         );

   101         if (arr != null) {

   102             requireScript(arr[0]);

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

   104                 return null;

   105             }

   106         }

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

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

   109             "container", "prototype"

   110         );

   111         StringArray toInitilize = new StringArray();

   112         final String className = className(jc);

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

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

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

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

   117             if (v.isStatic()) {

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

   119             }

   120         }

   121         if (proto == null) {

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

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

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

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

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

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

   128         } else {

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

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

   131                 proto[0] = "p";

   132             }

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

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

   135         }

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

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

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

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

   140                 "name", "value"

   141             );

   142             if (only != null) {

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

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

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

   146                 }

   147                 continue;

   148             }

   149             String prefix;

   150             String mn;

   151             if (m.isStatic()) {

   152                 prefix = "\n    c.";

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

   154             } else {

   155                 if (m.isConstructor()) {

   156                     prefix = "\n    CLS.";

   157                     mn = generateInstanceMethod(prefix, m);

   158                 } else {

   159                     prefix = "\n    c.";

   160                     mn = generateInstanceMethod(prefix, m);

   161                 }

   162             }

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

   164             if (runAnno != null) {

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

   166                 generateAnno(jc, out, runAnno);

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

   168             }

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

   170         }

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

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

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

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

   175         }

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

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

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

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

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

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

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

   183         if (classAnno != null) {

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

   185             generateAnno(jc, out, classAnno);

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

   187         }

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

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

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

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

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

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

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

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

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

   197                 "name", "value"

   198             );

   199             if (only != null) {

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

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

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

   203                 }

   204                 continue;

   205             }

   206             if (!v.isStatic()) {

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

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

   209             }

   210         }

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

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

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

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

   215         StringBuilder sb = new StringBuilder();

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

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

   218         }

   219         return sb.toString();

   220     }

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

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

   223         if (jsb != null) {

   224             return jsb;

   225         }

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

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

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

   229         }

   230         generateMethod(prefix, mn, m);

   231         return mn;

   232     }

   233 

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

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

   236         if (jsb != null) {

   237             return jsb;

   238         }

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

   240         generateMethod(prefix, mn, m);

   241         return mn;

   242     }

   243 

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

   245             throws IOException {

   246         final StackMapIterator stackMapIterator = m.createStackMapIterator();

   247         TrapDataIterator trap = m.getTrapDataIterator();

   248         final LocalsMapper lmapper =

   249                 new LocalsMapper(stackMapIterator.getArguments());

   250 

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

   252         lmapper.outputArguments(out);

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

   254 

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

   256         if (byteCodes == null) {

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

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

   259             out.append("};");

   260             return;

   261         }

   262 

   263         final StackMapper smapper = new StackMapper();

   264 

   265         final int maxLocals = m.getMaxLocals();

   266         if (maxLocals > 0) {

   267             // TODO: generate only used local variables

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

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

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

   271                     out.append(", ");

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

   273                 }

   274                 out.append(';');

   275             }

   276         }

   277 

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

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

   280         final int maxStack = m.getMaxStack();

   281         if (maxStack > 0) {

   282             // TODO: generate only used stack variables

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

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

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

   286                     out.append(", ");

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

   288                 }

   289                 out.append(';');

   290             }

   291         }

   292 

   293         int lastStackFrame = -1;

   294         TrapData[] previousTrap = null;

   295         

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

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

   298             int prev = i;

   299             stackMapIterator.advanceTo(i);

   300             boolean changeInCatch = trap.advanceTo(i);

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

   302                 if (previousTrap != null) {

   303                     generateCatch(previousTrap);

   304                     previousTrap = null;

   305                 }

   306             }

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

   308                 lastStackFrame = stackMapIterator.getFrameIndex();

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

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

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

   312                 changeInCatch = true;

   313             } else {

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

   315             }

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

   317                 out.append("try {");

   318                 previousTrap = trap.current();

   319             }

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

   321             switch (c) {

   322                 case opc_aload_0:

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

   324                     break;

   325                 case opc_iload_0:

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

   327                     break;

   328                 case opc_lload_0:

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

   330                     break;

   331                 case opc_fload_0:

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

   333                     break;

   334                 case opc_dload_0:

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

   336                     break;

   337                 case opc_aload_1:

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

   339                     break;

   340                 case opc_iload_1:

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

   342                     break;

   343                 case opc_lload_1:

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

   345                     break;

   346                 case opc_fload_1:

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

   348                     break;

   349                 case opc_dload_1:

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

   351                     break;

   352                 case opc_aload_2:

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

   354                     break;

   355                 case opc_iload_2:

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

   357                     break;

   358                 case opc_lload_2:

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

   360                     break;

   361                 case opc_fload_2:

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

   363                     break;

   364                 case opc_dload_2:

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

   366                     break;

   367                 case opc_aload_3:

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

   369                     break;

   370                 case opc_iload_3:

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

   372                     break;

   373                 case opc_lload_3:

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

   375                     break;

   376                 case opc_fload_3:

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

   378                     break;

   379                 case opc_dload_3:

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

   381                     break;

   382                 case opc_iload: {

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

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

   385                     break;

   386                 }

   387                 case opc_lload: {

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

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

   390                     break;

   391                 }

   392                 case opc_fload: {

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

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

   395                     break;

   396                 }

   397                 case opc_dload: {

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

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

   400                     break;

   401                 }

   402                 case opc_aload: {

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

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

   405                     break;

   406                 }

   407                 case opc_istore: {

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

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

   410                     break;

   411                 }

   412                 case opc_lstore: {

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

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

   415                     break;

   416                 }

   417                 case opc_fstore: {

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

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

   420                     break;

   421                 }

   422                 case opc_dstore: {

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

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

   425                     break;

   426                 }

   427                 case opc_astore: {

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

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

   430                     break;

   431                 }

   432                 case opc_astore_0:

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

   434                     break;

   435                 case opc_istore_0:

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

   437                     break;

   438                 case opc_lstore_0:

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

   440                     break;

   441                 case opc_fstore_0:

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

   443                     break;

   444                 case opc_dstore_0:

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

   446                     break;

   447                 case opc_astore_1:

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

   449                     break;

   450                 case opc_istore_1:

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

   452                     break;

   453                 case opc_lstore_1:

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

   455                     break;

   456                 case opc_fstore_1:

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

   458                     break;

   459                 case opc_dstore_1:

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

   461                     break;

   462                 case opc_astore_2:

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

   464                     break;

   465                 case opc_istore_2:

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

   467                     break;

   468                 case opc_lstore_2:

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

   470                     break;

   471                 case opc_fstore_2:

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

   473                     break;

   474                 case opc_dstore_2:

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

   476                     break;

   477                 case opc_astore_3:

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

   479                     break;

   480                 case opc_istore_3:

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

   482                     break;

   483                 case opc_lstore_3:

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

   485                     break;

   486                 case opc_fstore_3:

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

   488                     break;

   489                 case opc_dstore_3:

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

   491                     break;

   492                 case opc_iadd:

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

   494                     break;

   495                 case opc_ladd:

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

   497                     break;

   498                 case opc_fadd:

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

   500                     break;

   501                 case opc_dadd:

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

   503                     break;

   504                 case opc_isub:

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

   506                     break;

   507                 case opc_lsub:

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

   509                     break;

   510                 case opc_fsub:

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

   512                     break;

   513                 case opc_dsub:

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

   515                     break;

   516                 case opc_imul:

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

   518                     break;

   519                 case opc_lmul:

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

   521                     break;

   522                 case opc_fmul:

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

   524                     break;

   525                 case opc_dmul:

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

   527                     break;

   528                 case opc_idiv:

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

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

   531                     break;

   532                 case opc_ldiv:

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

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

   535                     break;

   536                 case opc_fdiv:

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

   538                     break;

   539                 case opc_ddiv:

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

   541                     break;

   542                 case opc_irem:

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

   544                     break;

   545                 case opc_lrem:

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

   547                     break;

   548                 case opc_frem:

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

   550                     break;

   551                 case opc_drem:

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

   553                     break;

   554                 case opc_iand:

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

   556                     break;

   557                 case opc_land:

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

   559                     break;

   560                 case opc_ior:

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

   562                     break;

   563                 case opc_lor:

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

   565                     break;

   566                 case opc_ixor:

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

   568                     break;

   569                 case opc_lxor:

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

   571                     break;

   572                 case opc_ineg:

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

   574                     break;

   575                 case opc_lneg:

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

   577                     break;

   578                 case opc_fneg:

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

   580                     break;

   581                 case opc_dneg:

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

   583                     break;

   584                 case opc_ishl:

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

   586                     break;

   587                 case opc_lshl:

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

   589                     break;

   590                 case opc_ishr:

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

   592                     break;

   593                 case opc_lshr:

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

   595                     break;

   596                 case opc_iushr:

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

   598                     break;

   599                 case opc_lushr:

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

   601                     break;

   602                 case opc_iinc: {

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

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

   605                     if (incrBy == 1) {

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

   607                     } else {

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

   609                              lmapper.getI(varIndx),

   610                              Integer.toString(incrBy));

   611                     }

   612                     break;

   613                 }

   614                 case opc_return:

   615                     emit(out, "return;");

   616                     break;

   617                 case opc_ireturn:

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

   619                     break;

   620                 case opc_lreturn:

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

   622                     break;

   623                 case opc_freturn:

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

   625                     break;

   626                 case opc_dreturn:

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

   628                     break;

   629                 case opc_areturn:

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

   631                     break;

   632                 case opc_i2l:

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

   634                     break;

   635                 case opc_i2f:

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

   637                     break;

   638                 case opc_i2d:

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

   640                     break;

   641                 case opc_l2i:

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

   643                     break;

   644                     // max int check?

   645                 case opc_l2f:

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

   647                     break;

   648                 case opc_l2d:

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

   650                     break;

   651                 case opc_f2d:

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

   653                     break;

   654                 case opc_d2f:

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

   656                     break;

   657                 case opc_f2i:

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

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

   660                     break;

   661                 case opc_f2l:

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

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

   664                     break;

   665                 case opc_d2i:

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

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

   668                     break;

   669                 case opc_d2l:

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

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

   672                     break;

   673                 case opc_i2b:

   674                 case opc_i2c:

   675                 case opc_i2s:

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

   677                     break;

   678                 case opc_aconst_null:

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

   680                     break;

   681                 case opc_iconst_m1:

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

   683                     break;

   684                 case opc_iconst_0:

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

   686                     break;

   687                 case opc_dconst_0:

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

   689                     break;

   690                 case opc_lconst_0:

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

   692                     break;

   693                 case opc_fconst_0:

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

   695                     break;

   696                 case opc_iconst_1:

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

   698                     break;

   699                 case opc_lconst_1:

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

   701                     break;

   702                 case opc_fconst_1:

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

   704                     break;

   705                 case opc_dconst_1:

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

   707                     break;

   708                 case opc_iconst_2:

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

   710                     break;

   711                 case opc_fconst_2:

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

   713                     break;

   714                 case opc_iconst_3:

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

   716                     break;

   717                 case opc_iconst_4:

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

   719                     break;

   720                 case opc_iconst_5:

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

   722                     break;

   723                 case opc_ldc: {

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

   725                     String v = encodeConstant(indx);

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

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

   728                     break;

   729                 }

   730                 case opc_ldc_w:

   731                 case opc_ldc2_w: {

   732                     int indx = readIntArg(byteCodes, i);

   733                     i += 2;

   734                     String v = encodeConstant(indx);

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

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

   737                     break;

   738                 }

   739                 case opc_lcmp:

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

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

   742                     break;

   743                 case opc_fcmpl:

   744                 case opc_fcmpg:

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

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

   747                     break;

   748                 case opc_dcmpl:

   749                 case opc_dcmpg:

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

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

   752                     break;

   753                 case opc_if_acmpeq:

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

   755                                    "===");

   756                     break;

   757                 case opc_if_acmpne:

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

   759                                    "!=");

   760                     break;

   761                 case opc_if_icmpeq:

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

   763                                    "==");

   764                     break;

   765                 case opc_ifeq: {

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

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

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

   769                     i += 2;

   770                     break;

   771                 }

   772                 case opc_ifne: {

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

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

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

   776                     i += 2;

   777                     break;

   778                 }

   779                 case opc_iflt: {

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

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

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

   783                     i += 2;

   784                     break;

   785                 }

   786                 case opc_ifle: {

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

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

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

   790                     i += 2;

   791                     break;

   792                 }

   793                 case opc_ifgt: {

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

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

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

   797                     i += 2;

   798                     break;

   799                 }

   800                 case opc_ifge: {

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

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

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

   804                     i += 2;

   805                     break;

   806                 }

   807                 case opc_ifnonnull: {

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

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

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

   811                     i += 2;

   812                     break;

   813                 }

   814                 case opc_ifnull: {

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

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

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

   818                     i += 2;

   819                     break;

   820                 }

   821                 case opc_if_icmpne:

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

   823                                    "!=");

   824                     break;

   825                 case opc_if_icmplt:

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

   827                                    "<");

   828                     break;

   829                 case opc_if_icmple:

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

   831                                    "<=");

   832                     break;

   833                 case opc_if_icmpgt:

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

   835                                    ">");

   836                     break;

   837                 case opc_if_icmpge:

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

   839                                    ">=");

   840                     break;

   841                 case opc_goto: {

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

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

   844                     i += 2;

   845                     break;

   846                 }

   847                 case opc_lookupswitch: {

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

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

   850                     table += 4;

   851                     int n = readInt4(byteCodes, table);

   852                     table += 4;

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

   854                     while (n-- > 0) {

   855                         int cnstnt = readInt4(byteCodes, table);

   856                         table += 4;

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

   858                         table += 4;

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

   860                     }

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

   862                     i = table - 1;

   863                     break;

   864                 }

   865                 case opc_tableswitch: {

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

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

   868                     table += 4;

   869                     int low = readInt4(byteCodes, table);

   870                     table += 4;

   871                     int high = readInt4(byteCodes, table);

   872                     table += 4;

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

   874                     while (low <= high) {

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

   876                         table += 4;

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

   878                         low++;

   879                     }

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

   881                     i = table - 1;

   882                     break;

   883                 }

   884                 case opc_invokeinterface: {

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

   886                     break;

   887                 }

   888                 case opc_invokevirtual:

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

   890                     break;

   891                 case opc_invokespecial:

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

   893                     break;

   894                 case opc_invokestatic:

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

   896                     break;

   897                 case opc_new: {

   898                     int indx = readIntArg(byteCodes, i);

   899                     String ci = jc.getClassName(indx);

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

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

   902                     addReference(ci);

   903                     i += 2;

   904                     break;

   905                 }

   906                 case opc_newarray:

   907                     ++i; // skip type of array

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

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

   910                     break;

   911                 case opc_anewarray:

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

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

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

   915                     break;

   916                 case opc_multianewarray: {

   917                     i += 2;

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

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

   920                        .append(").fillNulls();");

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

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

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

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

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

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

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

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

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

   930                             append(";");

   931                     }

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

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

   934                     }

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

   936                     break;

   937                 }

   938                 case opc_arraylength:

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

   940                     break;

   941                 case opc_lastore:

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

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

   944                     break;

   945                 case opc_fastore:

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

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

   948                     break;

   949                 case opc_dastore:

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

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

   952                     break;

   953                 case opc_aastore:

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

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

   956                     break;

   957                 case opc_iastore:

   958                 case opc_bastore:

   959                 case opc_castore:

   960                 case opc_sastore:

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

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

   963                     break;

   964                 case opc_laload:

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

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

   967                     break;

   968                 case opc_faload:

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

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

   971                     break;

   972                 case opc_daload:

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

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

   975                     break;

   976                 case opc_aaload:

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

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

   979                     break;

   980                 case opc_iaload:

   981                 case opc_baload:

   982                 case opc_caload:

   983                 case opc_saload:

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

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

   986                     break;

   987                 case opc_pop:

   988                 case opc_pop2:

   989                     smapper.pop(1);

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

   991                     break;

   992                 case opc_dup: {

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

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

   995                     break;

   996                 }

   997                 case opc_dup2: {

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

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

  1000                         emit(out, "@1 = @2;", smapper.pushT(v.getType()), v);

  1001                     } else {

  1002                         final Variable v1 = smapper.get(0);

  1003                         final Variable v2 = smapper.get(1);

  1004                         emit(out, "{ @1 = @2; @3 = @4; }",

  1005                              smapper.pushT(v2.getType()), v2,

  1006                              smapper.pushT(v1.getType()), v1);

  1007                     }

  1008                     break;

  1009                 }

  1010                 case opc_dup_x1: {

  1011                     final Variable vi1 = smapper.pop();

  1012                     final Variable vi2 = smapper.pop();

  1013                     final Variable vo3 = smapper.pushT(vi1.getType());

  1014                     final Variable vo2 = smapper.pushT(vi2.getType());

  1015                     final Variable vo1 = smapper.pushT(vi1.getType());

  1016 

  1017                     emit(out, "{ @1 = @2; @3 = @4; @5 = @6; }",

  1018                          vo1, vi1, vo2, vi2, vo3, vo1);

  1019                     break;

  1020                 }

  1021                 case opc_dup_x2: {

  1022                     if (smapper.get(1).isCategory2()) {

  1023                         final Variable vi1 = smapper.pop();

  1024                         final Variable vi2 = smapper.pop();

  1025                         final Variable vo3 = smapper.pushT(vi1.getType());

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

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

  1028 

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

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

  1031                     } else {

  1032                         final Variable vi1 = smapper.pop();

  1033                         final Variable vi2 = smapper.pop();

  1034                         final Variable vi3 = smapper.pop();

  1035                         final Variable vo4 = smapper.pushT(vi1.getType());

  1036                         final Variable vo3 = smapper.pushT(vi3.getType());

  1037                         final Variable vo2 = smapper.pushT(vi2.getType());

  1038                         final Variable vo1 = smapper.pushT(vi1.getType());

  1039 

  1040                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; @7 = @8; }",

  1041                              vo1, vi1, vo2, vi2, vo3, vi3, vo4, vo1);

  1042                     }

  1043                     break;

  1044                 }

  1045                 case opc_bipush:

  1046                     emit(out, "@1 = @2;",

  1047                          smapper.pushI(), Integer.toString(byteCodes[++i]));

  1048                     break;

  1049                 case opc_sipush:

  1050                     emit(out, "@1 = @2;",

  1051                          smapper.pushI(),

  1052                          Integer.toString(readIntArg(byteCodes, i)));

  1053                     i += 2;

  1054                     break;

  1055                 case opc_getfield: {

  1056                     int indx = readIntArg(byteCodes, i);

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

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

  1059                     emit(out, "@2 = @1.fld_@3;",

  1060                          smapper.popA(), smapper.pushT(type), fi[1]);

  1061                     i += 2;

  1062                     break;

  1063                 }

  1064                 case opc_getstatic: {

  1065                     int indx = readIntArg(byteCodes, i);

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

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

  1068                     emit(out, "@1 = @2(false).constructor.@3;",

  1069                          smapper.pushT(type),

  1070                          accessClass(fi[0].replace('/', '_')), fi[1]);

  1071                     i += 2;

  1072                     addReference(fi[0]);

  1073                     break;

  1074                 }

  1075                 case opc_putfield: {

  1076                     int indx = readIntArg(byteCodes, i);

  1077                     String[] fi = jc.getFieldInfoName(indx);

  1078                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1079                     emit(out, "@2.fld_@3 = @1;",

  1080                          smapper.popT(type), smapper.popA(), fi[1]);

  1081                     i += 2;

  1082                     break;

  1083                 }

  1084                 case opc_putstatic: {

  1085                     int indx = readIntArg(byteCodes, i);

  1086                     String[] fi = jc.getFieldInfoName(indx);

  1087                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1088                     emit(out, "@1(false).constructor.@2 = @3;",

  1089                          accessClass(fi[0].replace('/', '_')), fi[1],

  1090                          smapper.popT(type));

  1091                     i += 2;

  1092                     addReference(fi[0]);

  1093                     break;

  1094                 }

  1095                 case opc_checkcast: {

  1096                     int indx = readIntArg(byteCodes, i);

  1097                     final String type = jc.getClassName(indx);

  1098                     if (!type.startsWith("[")) {

  1099                         // no way to check arrays right now

  1100                         // XXX proper exception

  1101                         emit(out,

  1102                              "if (@1 !== null && !@1.$instOf_@2) throw {};",

  1103                              smapper.getA(0), type.replace('/', '_'));

  1104                     }

  1105                     i += 2;

  1106                     break;

  1107                 }

  1108                 case opc_instanceof: {

  1109                     int indx = readIntArg(byteCodes, i);

  1110                     final String type = jc.getClassName(indx);

  1111                     emit(out, "@2 = @1.$instOf_@3 ? 1 : 0;",

  1112                          smapper.popA(), smapper.pushI(),

  1113                          type.replace('/', '_'));

  1114                     i += 2;

  1115                     break;

  1116                 }

  1117                 case opc_athrow: {

  1118                     final Variable v = smapper.popA();

  1119                     smapper.clear();

  1120 

  1121                     emit(out, "{ @1 = @2; throw @2; }",

  1122                          smapper.pushA(), v);

  1123                     break;

  1124                 }

  1125 

  1126                 case opc_monitorenter: {

  1127                     out.append("/* monitor enter */");

  1128                     smapper.popA();

  1129                     break;

  1130                 }

  1131 

  1132                 case opc_monitorexit: {

  1133                     out.append("/* monitor exit */");

  1134                     smapper.popA();

  1135                     break;

  1136                 }

  1137 

  1138                 default: {

  1139                     emit(out, "throw 'unknown bytecode @1';",

  1140                          Integer.toString(c));

  1141                 }

  1142             }

  1143             if (debug(" //")) {

  1144                 for (int j = prev; j <= i; j++) {

  1145                     out.append(" ");

  1146                     final int cc = readByte(byteCodes, j);

  1147                     out.append(Integer.toString(cc));

  1148                 }

  1149             }

  1150             out.append("\n");            

  1151         }

  1152         if (previousTrap != null) {

  1153             generateCatch(previousTrap);

  1154         }

  1155         out.append("  }\n");

  1156         out.append("};");

  1157     }

  1158 

  1159     private int generateIf(byte[] byteCodes, int i,

  1160                            final Variable v2, final Variable v1,

  1161                            final String test) throws IOException {

  1162         int indx = i + readIntArg(byteCodes, i);

  1163         out.append("if (").append(v1)

  1164            .append(' ').append(test).append(' ')

  1165            .append(v2).append(") { gt = " + indx)

  1166            .append("; continue; }");

  1167         return i + 2;

  1168     }

  1169 

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

  1171         final int indxHi = byteCodes[offsetInstruction + 1] << 8;

  1172         final int indxLo = byteCodes[offsetInstruction + 2];

  1173         return (indxHi & 0xffffff00) | (indxLo & 0xff);

  1174     }

  1175     private int readInt4(byte[] byteCodes, int offsetInstruction) {

  1176         final int d = byteCodes[offsetInstruction + 0] << 24;

  1177         final int c = byteCodes[offsetInstruction + 1] << 16;

  1178         final int b = byteCodes[offsetInstruction + 2] << 8;

  1179         final int a = byteCodes[offsetInstruction + 3];

  1180         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

  1181     }

  1182     private int readByte(byte[] byteCodes, int offsetInstruction) {

  1183         return byteCodes[offsetInstruction] & 0xff;

  1184     }

  1185     

  1186     private static void countArgs(String descriptor, char[] returnType, StringBuilder sig, StringBuilder cnt) {

  1187         int i = 0;

  1188         Boolean count = null;

  1189         boolean array = false;

  1190         sig.append("__");

  1191         int firstPos = sig.length();

  1192         while (i < descriptor.length()) {

  1193             char ch = descriptor.charAt(i++);

  1194             switch (ch) {

  1195                 case '(':

  1196                     count = true;

  1197                     continue;

  1198                 case ')':

  1199                     count = false;

  1200                     continue;

  1201                 case 'B': 

  1202                 case 'C': 

  1203                 case 'D': 

  1204                 case 'F': 

  1205                 case 'I': 

  1206                 case 'J': 

  1207                 case 'S': 

  1208                 case 'Z': 

  1209                     if (count) {

  1210                         if (array) {

  1211                             sig.append("_3");

  1212                         }

  1213                         sig.append(ch);

  1214                         if (ch == 'J' || ch == 'D') {

  1215                             cnt.append('1');

  1216                         } else {

  1217                             cnt.append('0');

  1218                         }

  1219                     } else {

  1220                         sig.insert(firstPos, ch);

  1221                         if (array) {

  1222                             returnType[0] = '[';

  1223                             sig.insert(firstPos, "_3");

  1224                         } else {

  1225                             returnType[0] = ch;

  1226                         }

  1227                     }

  1228                     array = false;

  1229                     continue;

  1230                 case 'V': 

  1231                     assert !count;

  1232                     returnType[0] = 'V';

  1233                     sig.insert(firstPos, 'V');

  1234                     continue;

  1235                 case 'L':

  1236                     int next = descriptor.indexOf(';', i);

  1237                     String realSig = mangleSig(descriptor, i - 1, next + 1);

  1238                     if (count) {

  1239                         if (array) {

  1240                             sig.append("_3");

  1241                         }

  1242                         sig.append(realSig);

  1243                         cnt.append('0');

  1244                     } else {

  1245                         sig.insert(firstPos, realSig);

  1246                         if (array) {

  1247                             sig.insert(firstPos, "_3");

  1248                         }

  1249                         returnType[0] = 'L';

  1250                     }

  1251                     i = next + 1;

  1252                     continue;

  1253                 case '[':

  1254                     array = true;

  1255                     continue;

  1256                 default:

  1257                     throw new IllegalStateException("Invalid char: " + ch);

  1258             }

  1259         }

  1260     }

  1261     

  1262     private static String mangleSig(String txt, int first, int last) {

  1263         StringBuilder sb = new StringBuilder();

  1264         for (int i = first; i < last; i++) {

  1265             final char ch = txt.charAt(i);

  1266             switch (ch) {

  1267                 case '/': sb.append('_'); break;

  1268                 case '_': sb.append("_1"); break;

  1269                 case ';': sb.append("_2"); break;

  1270                 case '[': sb.append("_3"); break;

  1271                 default: sb.append(ch); break;

  1272             }

  1273         }

  1274         shortenSig(sb, "Ljava_lang_String_2", 's');

  1275         shortenSig(sb, "Ljava_lang_Object_2", 'o');

  1276         return sb.toString();

  1277     }

  1278     

  1279     private static void shortenSig(StringBuilder sb, String strng, char r) {

  1280         for (;;) {

  1281             int pos = sb.indexOf(strng);

  1282             if (pos == -1) {

  1283                 break;

  1284             }

  1285             sb.delete(pos, pos + strng.length());

  1286             sb.insert(pos, r);

  1287         }

  1288     }

  1289     

  1290     private static String findMethodName(MethodData m, StringBuilder cnt) {

  1291         StringBuilder name = new StringBuilder();

  1292         if ("<init>".equals(m.getName())) { // NOI18N

  1293             name.append("cons"); // NOI18N

  1294         } else if ("<clinit>".equals(m.getName())) { // NOI18N

  1295             name.append("class"); // NOI18N

  1296         } else {

  1297             name.append(m.getName());

  1298         } 

  1299         

  1300         countArgs(m.getInternalSig(), new char[1], name, cnt);

  1301         return name.toString();

  1302     }

  1303 

  1304     static String findMethodName(String[] mi, StringBuilder cnt, char[] returnType) {

  1305         StringBuilder name = new StringBuilder();

  1306         String descr = mi[2];//mi.getDescriptor();

  1307         String nm= mi[1];

  1308         if ("<init>".equals(nm)) { // NOI18N

  1309             name.append("cons"); // NOI18N

  1310         } else {

  1311             name.append(nm);

  1312         }

  1313         countArgs(descr, returnType, name, cnt);

  1314         return name.toString();

  1315     }

  1316 

  1317     private int invokeStaticMethod(byte[] byteCodes, int i, final StackMapper mapper, boolean isStatic)

  1318     throws IOException {

  1319         int methodIndex = readIntArg(byteCodes, i);

  1320         String[] mi = jc.getFieldInfoName(methodIndex);

  1321         char[] returnType = { 'V' };

  1322         StringBuilder cnt = new StringBuilder();

  1323         String mn = findMethodName(mi, cnt, returnType);

  1324 

  1325         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1326         final Variable[] vars = new Variable[numArguments];

  1327 

  1328         for (int j = numArguments - 1; j >= 0; --j) {

  1329             vars[j] = mapper.pop();

  1330         }

  1331 

  1332         if (returnType[0] != 'V') {

  1333             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1334                .append(" = ");

  1335         }

  1336 

  1337         final String in = mi[0];

  1338         out.append(accessClass(in.replace('/', '_')));

  1339         out.append("(false).");

  1340         if (mn.startsWith("cons_")) {

  1341             out.append("constructor.");

  1342         }

  1343         out.append(mn);

  1344         out.append('(');

  1345         if (numArguments > 0) {

  1346             out.append(vars[0]);

  1347             for (int j = 1; j < numArguments; ++j) {

  1348                 out.append(", ");

  1349                 out.append(vars[j]);

  1350             }

  1351         }

  1352         out.append(");");

  1353         i += 2;

  1354         addReference(in);

  1355         return i;

  1356     }

  1357     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackMapper mapper)

  1358     throws IOException {

  1359         int methodIndex = readIntArg(byteCodes, i);

  1360         String[] mi = jc.getFieldInfoName(methodIndex);

  1361         char[] returnType = { 'V' };

  1362         StringBuilder cnt = new StringBuilder();

  1363         String mn = findMethodName(mi, cnt, returnType);

  1364 

  1365         final int numArguments = cnt.length() + 1;

  1366         final Variable[] vars = new Variable[numArguments];

  1367 

  1368         for (int j = numArguments - 1; j >= 0; --j) {

  1369             vars[j] = mapper.pop();

  1370         }

  1371 

  1372         if (returnType[0] != 'V') {

  1373             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1374                .append(" = ");

  1375         }

  1376 

  1377         out.append(vars[0]).append('.');

  1378         out.append(mn);

  1379         out.append('(');

  1380         out.append(vars[0]);

  1381         for (int j = 1; j < numArguments; ++j) {

  1382             out.append(", ");

  1383             out.append(vars[j]);

  1384         }

  1385         out.append(");");

  1386         i += 2;

  1387         return i;

  1388     }

  1389 

  1390     private void addReference(String cn) throws IOException {

  1391         if (requireReference(cn)) {

  1392             debug(" /* needs " + cn + " */");

  1393         }

  1394     }

  1395 

  1396     private void outType(String d, StringBuilder out) {

  1397         int arr = 0;

  1398         while (d.charAt(0) == '[') {

  1399             out.append('A');

  1400             d = d.substring(1);

  1401         }

  1402         if (d.charAt(0) == 'L') {

  1403             assert d.charAt(d.length() - 1) == ';';

  1404             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1405         } else {

  1406             out.append(d);

  1407         }

  1408     }

  1409 

  1410     private String encodeConstant(int entryIndex) throws IOException {

  1411         String[] classRef = { null };

  1412         String s = jc.stringValue(entryIndex, classRef);

  1413         if (classRef[0] != null) {

  1414             addReference(classRef[0]);

  1415             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1416         }

  1417         return s;

  1418     }

  1419 

  1420     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1421         byte[] arr = m.findAnnotationData(true);

  1422         if (arr == null) {

  1423             return null;

  1424         }

  1425         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1426         class P extends AnnotationParser {

  1427             public P() {

  1428                 super(false);

  1429             }

  1430             

  1431             int cnt;

  1432             String[] args = new String[30];

  1433             String body;

  1434             

  1435             @Override

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

  1437                 if (type.equals(jvmType)) {

  1438                     if ("body".equals(attr)) {

  1439                         body = value;

  1440                     } else if ("args".equals(attr)) {

  1441                         args[cnt++] = value;

  1442                     } else {

  1443                         throw new IllegalArgumentException(attr);

  1444                     }

  1445                 }

  1446             }

  1447         }

  1448         P p = new P();

  1449         p.parse(arr, jc);

  1450         if (p.body == null) {

  1451             return null;

  1452         }

  1453         StringBuilder cnt = new StringBuilder();

  1454         final String mn = findMethodName(m, cnt);

  1455         out.append(prefix).append(mn);

  1456         out.append(" = function(");

  1457         String space;

  1458         int index;

  1459         if (!isStatic) {                

  1460             space = outputArg(out, p.args, 0);

  1461             index = 1;

  1462         } else {

  1463             space = "";

  1464             index = 0;

  1465         }

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

  1467             out.append(space);

  1468             space = outputArg(out, p.args, index);

  1469             index++;

  1470         }

  1471         out.append(") {").append("\n");

  1472         out.append(p.body);

  1473         out.append("\n}\n");

  1474         return mn;

  1475     }

  1476     private static String className(ClassData jc) {

  1477         //return jc.getName().getInternalName().replace('/', '_');

  1478         return jc.getClassName().replace('/', '_');

  1479     }

  1480     

  1481     private static String[] findAnnotation(

  1482         byte[] arr, ClassData cd, final String className, 

  1483         final String... attrNames

  1484     ) throws IOException {

  1485         if (arr == null) {

  1486             return null;

  1487         }

  1488         final String[] values = new String[attrNames.length];

  1489         final boolean[] found = { false };

  1490         final String jvmType = "L" + className.replace('.', '/') + ";";

  1491         AnnotationParser ap = new AnnotationParser(false) {

  1492             @Override

  1493             protected void visitAttr(String type, String attr, String at, String value) {

  1494                 if (type.equals(jvmType)) {

  1495                     found[0] = true;

  1496                     for (int i = 0; i < attrNames.length; i++) {

  1497                         if (attrNames[i].equals(attr)) {

  1498                             values[i] = value;

  1499                         }

  1500                     }

  1501                 }

  1502             }

  1503             

  1504         };

  1505         ap.parse(arr, cd);

  1506         return found[0] ? values : null;

  1507     }

  1508 

  1509     private CharSequence initField(FieldData v) {

  1510         final String is = v.getInternalSig();

  1511         if (is.length() == 1) {

  1512             switch (is.charAt(0)) {

  1513                 case 'S':

  1514                 case 'J':

  1515                 case 'B':

  1516                 case 'Z':

  1517                 case 'C':

  1518                 case 'I': return " = 0;";

  1519                 case 'F': 

  1520                 case 'D': return " = 0.0;";

  1521                 default:

  1522                     throw new IllegalStateException(is);

  1523             }

  1524         }

  1525         return " = null;";

  1526     }

  1527 

  1528     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1529         AnnotationParser ap = new AnnotationParser(true) {

  1530             int anno;

  1531             int cnt;

  1532             

  1533             @Override

  1534             protected void visitAnnotationStart(String type) throws IOException {

  1535                 if (anno++ > 0) {

  1536                     out.append(",");

  1537                 }

  1538                 out.append('"').append(type).append("\" : {\n");

  1539                 cnt = 0;

  1540             }

  1541 

  1542             @Override

  1543             protected void visitAnnotationEnd(String type) throws IOException {

  1544                 out.append("\n}\n");

  1545             }

  1546             

  1547             @Override

  1548             protected void visitAttr(String type, String attr, String attrType, String value) 

  1549             throws IOException {

  1550                 if (attr == null) {

  1551                     return;

  1552                 }

  1553                 if (cnt++ > 0) {

  1554                     out.append(",\n");

  1555                 }

  1556                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1557             }

  1558         };

  1559         ap.parse(data, cd);

  1560     }

  1561 

  1562     private static String outputArg(Appendable out, String[] args, int indx) throws IOException {

  1563         final String name = args[indx];

  1564         if (name == null) {

  1565             return "";

  1566         }

  1567         if (name.contains(",")) {

  1568             throw new IOException("Wrong parameter with ',': " + name);

  1569         }

  1570         out.append(name);

  1571         return ",";

  1572     }

  1573 

  1574     private static void emit(final Appendable out,

  1575                              final String format,

  1576                              final CharSequence... params) throws IOException {

  1577         final int length = format.length();

  1578 

  1579         int processed = 0;

  1580         int paramOffset = format.indexOf('@');

  1581         while ((paramOffset != -1) && (paramOffset < (length - 1))) {

  1582             final char paramChar = format.charAt(paramOffset + 1);

  1583             if ((paramChar >= '1') && (paramChar <= '9')) {

  1584                 final int paramIndex = paramChar - '0' - 1;

  1585 

  1586                 out.append(format, processed, paramOffset);

  1587                 out.append(params[paramIndex]);

  1588 

  1589                 ++paramOffset;

  1590                 processed = paramOffset + 1;

  1591             }

  1592 

  1593             paramOffset = format.indexOf('@', paramOffset + 1);

  1594         }

  1595 

  1596         out.append(format, processed, length);

  1597     }

  1598 

  1599     private void generateCatch(TrapData[] traps) throws IOException {

  1600         out.append("} catch (e) {\n");

  1601         int finallyPC = -1;

  1602         for (TrapData e : traps) {

  1603             if (e == null) {

  1604                 break;

  1605             }

  1606             if (e.catch_cpx != 0) { //not finally

  1607                 final String classInternalName = jc.getClassName(e.catch_cpx);

  1608                 addReference(classInternalName);

  1609                 out.append("if (e.$instOf_" + classInternalName.replace('/', '_') + ") {");

  1610                 out.append("gt=" + e.handler_pc + "; stA0 = e; continue;");

  1611                 out.append("}\n");

  1612             } else {

  1613                 finallyPC = e.handler_pc;

  1614             }

  1615         }

  1616         if (finallyPC == -1) {

  1617             out.append("throw e;");

  1618         } else {

  1619             out.append("gt=" + finallyPC + "; stA0 = e; continue;");

  1620         }

  1621         out.append("\n}");

  1622     }

  1623 }
hg/bck2brwsr