hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@859cc3a0b8f0

     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;

    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;

    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;

    40     protected ByteCodeToJavaScript(Appendable out) {

    41         this.out = out;

    42     }

    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);

    52     /*

    53      * @param resourcePath name of resources to read

    54      */

    55     protected abstract void requireScript(String resourcePath);

    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     }

    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     }

    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      */

    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     }

   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     }

   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());

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

   253         lmapper.outputArguments(out, m.isStatic());

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

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

   257         if (byteCodes == null) {

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

   259                .append(jc.getClassName()).append('.')

   260                .append(m.getName()).append("';\n");

   261             out.append("};");

   262             return;

   263         }

   265         final StackMapper smapper = new StackMapper();

   267         if (!m.isStatic()) {

   268             out.append("  var ").append(" lcA0 = this;\n");

   269         }

   271         int lastStackFrame = -1;

   272         TrapData[] previousTrap = null;

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

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

   276             int prev = i;

   277             stackMapIterator.advanceTo(i);

   278             boolean changeInCatch = trap.advanceTo(i);

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

   280                 if (previousTrap != null) {

   281                     generateCatch(previousTrap);

   282                     previousTrap = null;

   283                 }

   284             }

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

   286                 lastStackFrame = stackMapIterator.getFrameIndex();

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

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

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

   290                 changeInCatch = true;

   291             } else {

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

   293             }

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

   295                 out.append("try {");

   296                 previousTrap = trap.current();

   297             }

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

   299             switch (c) {

   300                 case opc_aload_0:

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

   302                     break;

   303                 case opc_iload_0:

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

   305                     break;

   306                 case opc_lload_0:

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

   308                     break;

   309                 case opc_fload_0:

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

   311                     break;

   312                 case opc_dload_0:

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

   314                     break;

   315                 case opc_aload_1:

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

   317                     break;

   318                 case opc_iload_1:

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

   320                     break;

   321                 case opc_lload_1:

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

   323                     break;

   324                 case opc_fload_1:

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

   326                     break;

   327                 case opc_dload_1:

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

   329                     break;

   330                 case opc_aload_2:

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

   332                     break;

   333                 case opc_iload_2:

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

   335                     break;

   336                 case opc_lload_2:

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

   338                     break;

   339                 case opc_fload_2:

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

   341                     break;

   342                 case opc_dload_2:

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

   344                     break;

   345                 case opc_aload_3:

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

   347                     break;

   348                 case opc_iload_3:

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

   350                     break;

   351                 case opc_lload_3:

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

   353                     break;

   354                 case opc_fload_3:

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

   356                     break;

   357                 case opc_dload_3:

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

   359                     break;

   360                 case opc_iload: {

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

   362                     emit(out, "var @1 = @2;",

   363                          smapper.pushI(), lmapper.getI(indx));

   364                     break;

   365                 }

   366                 case opc_lload: {

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

   368                     emit(out, "var @1 = @2;",

   369                          smapper.pushL(), lmapper.getL(indx));

   370                     break;

   371                 }

   372                 case opc_fload: {

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

   374                     emit(out, "var @1 = @2;",

   375                          smapper.pushF(), lmapper.getF(indx));

   376                     break;

   377                 }

   378                 case opc_dload: {

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

   380                     emit(out, "var @1 = @2;",

   381                          smapper.pushD(), lmapper.getD(indx));

   382                     break;

   383                 }

   384                 case opc_aload: {

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

   386                     emit(out, "var @1 = @2;",

   387                          smapper.pushA(), lmapper.getA(indx));

   388                     break;

   389                 }

   390                 case opc_istore: {

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

   392                     emit(out, "var @1 = @2;",

   393                          lmapper.setI(indx), smapper.popI());

   394                     break;

   395                 }

   396                 case opc_lstore: {

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

   398                     emit(out, "var @1 = @2;",

   399                          lmapper.setL(indx), smapper.popL());

   400                     break;

   401                 }

   402                 case opc_fstore: {

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

   404                     emit(out, "var @1 = @2;",

   405                          lmapper.setF(indx), smapper.popF());

   406                     break;

   407                 }

   408                 case opc_dstore: {

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

   410                     emit(out, "var @1 = @2;",

   411                          lmapper.setD(indx), smapper.popD());

   412                     break;

   413                 }

   414                 case opc_astore: {

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

   416                     emit(out, "var @1 = @2;",

   417                          lmapper.setA(indx), smapper.popA());

   418                     break;

   419                 }

   420                 case opc_astore_0:

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

   422                     break;

   423                 case opc_istore_0:

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

   425                     break;

   426                 case opc_lstore_0:

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

   428                     break;

   429                 case opc_fstore_0:

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

   431                     break;

   432                 case opc_dstore_0:

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

   434                     break;

   435                 case opc_astore_1:

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

   437                     break;

   438                 case opc_istore_1:

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

   440                     break;

   441                 case opc_lstore_1:

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

   443                     break;

   444                 case opc_fstore_1:

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

   446                     break;

   447                 case opc_dstore_1:

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

   449                     break;

   450                 case opc_astore_2:

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

   452                     break;

   453                 case opc_istore_2:

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

   455                     break;

   456                 case opc_lstore_2:

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

   458                     break;

   459                 case opc_fstore_2:

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

   461                     break;

   462                 case opc_dstore_2:

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

   464                     break;

   465                 case opc_astore_3:

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

   467                     break;

   468                 case opc_istore_3:

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

   470                     break;

   471                 case opc_lstore_3:

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

   473                     break;

   474                 case opc_fstore_3:

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

   476                     break;

   477                 case opc_dstore_3:

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

   479                     break;

   480                 case opc_iadd:

   481                     emit(out, "@1 = @1.add32(@2);", smapper.getI(1), smapper.popI());

   482                     break;

   483                 case opc_ladd:

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

   485                     break;

   486                 case opc_fadd:

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

   488                     break;

   489                 case opc_dadd:

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

   491                     break;

   492                 case opc_isub:

   493                     emit(out, "@1 = @1.sub32(@2);", smapper.getI(1), smapper.popI());

   494                     break;

   495                 case opc_lsub:

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

   497                     break;

   498                 case opc_fsub:

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

   500                     break;

   501                 case opc_dsub:

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

   503                     break;

   504                 case opc_imul:

   505                     emit(out, "@1 = @1.mul32(@2);", smapper.getI(1), smapper.popI());

   506                     break;

   507                 case opc_lmul:

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

   509                     break;

   510                 case opc_fmul:

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

   512                     break;

   513                 case opc_dmul:

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

   515                     break;

   516                 case opc_idiv:

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

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

   519                     break;

   520                 case opc_ldiv:

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

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

   523                     break;

   524                 case opc_fdiv:

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

   526                     break;

   527                 case opc_ddiv:

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

   529                     break;

   530                 case opc_irem:

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

   532                     break;

   533                 case opc_lrem:

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

   535                     break;

   536                 case opc_frem:

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

   538                     break;

   539                 case opc_drem:

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

   541                     break;

   542                 case opc_iand:

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

   544                     break;

   545                 case opc_land:

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

   547                     break;

   548                 case opc_ior:

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

   550                     break;

   551                 case opc_lor:

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

   553                     break;

   554                 case opc_ixor:

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

   556                     break;

   557                 case opc_lxor:

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

   559                     break;

   560                 case opc_ineg:

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

   562                     break;

   563                 case opc_lneg:

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

   565                     break;

   566                 case opc_fneg:

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

   568                     break;

   569                 case opc_dneg:

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

   571                     break;

   572                 case opc_ishl:

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

   574                     break;

   575                 case opc_lshl:

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

   577                     break;

   578                 case opc_ishr:

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

   580                     break;

   581                 case opc_lshr:

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

   583                     break;

   584                 case opc_iushr:

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

   586                     break;

   587                 case opc_lushr:

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

   589                     break;

   590                 case opc_iinc: {

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

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

   593                     if (incrBy == 1) {

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

   595                     } else {

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

   597                              lmapper.getI(varIndx),

   598                              Integer.toString(incrBy));

   599                     }

   600                     break;

   601                 }

   602                 case opc_return:

   603                     emit(out, "return;");

   604                     break;

   605                 case opc_ireturn:

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

   607                     break;

   608                 case opc_lreturn:

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

   610                     break;

   611                 case opc_freturn:

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

   613                     break;

   614                 case opc_dreturn:

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

   616                     break;

   617                 case opc_areturn:

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

   619                     break;

   620                 case opc_i2l:

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

   622                     break;

   623                 case opc_i2f:

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

   625                     break;

   626                 case opc_i2d:

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

   628                     break;

   629                 case opc_l2i:

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

   631                     break;

   632                     // max int check?

   633                 case opc_l2f:

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

   635                     break;

   636                 case opc_l2d:

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

   638                     break;

   639                 case opc_f2d:

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

   641                     break;

   642                 case opc_d2f:

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

   644                     break;

   645                 case opc_f2i:

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

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

   648                     break;

   649                 case opc_f2l:

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

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

   652                     break;

   653                 case opc_d2i:

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

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

   656                     break;

   657                 case opc_d2l:

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

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

   660                     break;

   661                 case opc_i2b:

   662                     emit(out, "var @1 = @1.toInt8();", smapper.getI(0));

   663                     break;

   664                 case opc_i2c:

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

   666                     break;

   667                 case opc_i2s:

   668                     emit(out, "var @1 = @1.toInt16();", smapper.getI(0));

   669                     break;

   670                 case opc_aconst_null:

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

   672                     break;

   673                 case opc_iconst_m1:

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

   675                     break;

   676                 case opc_iconst_0:

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

   678                     break;

   679                 case opc_dconst_0:

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

   681                     break;

   682                 case opc_lconst_0:

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

   684                     break;

   685                 case opc_fconst_0:

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

   687                     break;

   688                 case opc_iconst_1:

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

   690                     break;

   691                 case opc_lconst_1:

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

   693                     break;

   694                 case opc_fconst_1:

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

   696                     break;

   697                 case opc_dconst_1:

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

   699                     break;

   700                 case opc_iconst_2:

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

   702                     break;

   703                 case opc_fconst_2:

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

   705                     break;

   706                 case opc_iconst_3:

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

   708                     break;

   709                 case opc_iconst_4:

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

   711                     break;

   712                 case opc_iconst_5:

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

   714                     break;

   715                 case opc_ldc: {

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

   717                     String v = encodeConstant(indx);

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

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

   720                     break;

   721                 }

   722                 case opc_ldc_w:

   723                 case opc_ldc2_w: {

   724                     int indx = readIntArg(byteCodes, i);

   725                     i += 2;

   726                     String v = encodeConstant(indx);

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

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

   729                     break;

   730                 }

   731                 case opc_lcmp:

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

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

   734                     break;

   735                 case opc_fcmpl:

   736                 case opc_fcmpg:

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

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

   739                     break;

   740                 case opc_dcmpl:

   741                 case opc_dcmpg:

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

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

   744                     break;

   745                 case opc_if_acmpeq:

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

   747                                    "===");

   748                     break;

   749                 case opc_if_acmpne:

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

   751                                    "!=");

   752                     break;

   753                 case opc_if_icmpeq:

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

   755                                    "==");

   756                     break;

   757                 case opc_ifeq: {

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

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

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

   761                     i += 2;

   762                     break;

   763                 }

   764                 case opc_ifne: {

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

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

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

   768                     i += 2;

   769                     break;

   770                 }

   771                 case opc_iflt: {

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

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

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

   775                     i += 2;

   776                     break;

   777                 }

   778                 case opc_ifle: {

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

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

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

   782                     i += 2;

   783                     break;

   784                 }

   785                 case opc_ifgt: {

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

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

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

   789                     i += 2;

   790                     break;

   791                 }

   792                 case opc_ifge: {

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

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

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

   796                     i += 2;

   797                     break;

   798                 }

   799                 case opc_ifnonnull: {

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

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

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

   803                     i += 2;

   804                     break;

   805                 }

   806                 case opc_ifnull: {

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

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

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

   810                     i += 2;

   811                     break;

   812                 }

   813                 case opc_if_icmpne:

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

   815                                    "!=");

   816                     break;

   817                 case opc_if_icmplt:

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

   819                                    "<");

   820                     break;

   821                 case opc_if_icmple:

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

   823                                    "<=");

   824                     break;

   825                 case opc_if_icmpgt:

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

   827                                    ">");

   828                     break;

   829                 case opc_if_icmpge:

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

   831                                    ">=");

   832                     break;

   833                 case opc_goto: {

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

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

   836                     i += 2;

   837                     break;

   838                 }

   839                 case opc_lookupswitch: {

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

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

   842                     table += 4;

   843                     int n = readInt4(byteCodes, table);

   844                     table += 4;

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

   846                     while (n-- > 0) {

   847                         int cnstnt = readInt4(byteCodes, table);

   848                         table += 4;

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

   850                         table += 4;

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

   852                     }

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

   854                     i = table - 1;

   855                     break;

   856                 }

   857                 case opc_tableswitch: {

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

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

   860                     table += 4;

   861                     int low = readInt4(byteCodes, table);

   862                     table += 4;

   863                     int high = readInt4(byteCodes, table);

   864                     table += 4;

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

   866                     while (low <= high) {

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

   868                         table += 4;

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

   870                         low++;

   871                     }

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

   873                     i = table - 1;

   874                     break;

   875                 }

   876                 case opc_invokeinterface: {

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

   878                     break;

   879                 }

   880                 case opc_invokevirtual:

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

   882                     break;

   883                 case opc_invokespecial:

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

   885                     break;

   886                 case opc_invokestatic:

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

   888                     break;

   889                 case opc_new: {

   890                     int indx = readIntArg(byteCodes, i);

   891                     String ci = jc.getClassName(indx);

   892                     emit(out, "var @1 = new @2;",

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

   894                     addReference(ci);

   895                     i += 2;

   896                     break;

   897                 }

   898                 case opc_newarray:

   899                     int atype = readByte(byteCodes, ++i);

   900                     String jvmType;

   901                     switch (atype) {

   902                         case 4: jvmType = "[Z"; break;

   903                         case 5: jvmType = "[C"; break;

   904                         case 6: jvmType = "[F"; break;

   905                         case 7: jvmType = "[D"; break;

   906                         case 8: jvmType = "[B"; break;

   907                         case 9: jvmType = "[S"; break;

   908                         case 10: jvmType = "[I"; break;

   909                         case 11: jvmType = "[J"; break;

   910                         default: throw new IllegalStateException("Array type: " + atype);

   911                     }

   912                     emit(out, "var @2 = new Array(@1).initWith('@3', 0);",

   913                          smapper.popI(), smapper.pushA(), jvmType);

   914                     break;

   915                 case opc_anewarray: {

   916                     int type = readIntArg(byteCodes, i);

   917                     i += 2;

   918                     String typeName = jc.getClassName(type);

   919                     if (typeName.startsWith("[")) {

   920                         typeName = "[" + typeName;

   921                     } else {

   922                         typeName = "[L" + typeName + ";";

   923                     }

   924                     emit(out, "var @2 = new Array(@1).initWith('@3', null);",

   925                          smapper.popI(), smapper.pushA(), typeName);

   926                     break;

   927                 }

   928                 case opc_multianewarray: {

   929                     int type = readIntArg(byteCodes, i);

   930                     i += 2;

   931                     String typeName = jc.getClassName(type);

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

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

   934                        .append(").initWith('").append(typeName).append("', null);");

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

   936                         typeName = typeName.substring(1);

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

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

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

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

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

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

   943                             append (" = new Array(l" + d).append(").initWith('")

   944                             .append(typeName).append("', ")

   945                             .append(typeName.length() == 2 ? "0" : "null").append(");");

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

   947                             append(";");

   948                     }

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

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

   951                     }

   952                     out.append("\nvar ").append(smapper.pushA())

   953                                         .append(" = a0; }");

   954                     break;

   955                 }

   956                 case opc_arraylength:

   957                     emit(out, "var @2 = @1.length;",

   958                          smapper.popA(), smapper.pushI());

   959                     break;

   960                 case opc_lastore:

   961                     emit(out, "@3.at(@2, @1);",

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

   963                     break;

   964                 case opc_fastore:

   965                     emit(out, "@3.at(@2, @1);",

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

   967                     break;

   968                 case opc_dastore:

   969                     emit(out, "@3.at(@2, @1);",

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

   971                     break;

   972                 case opc_aastore:

   973                     emit(out, "@3.at(@2, @1);",

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

   975                     break;

   976                 case opc_iastore:

   977                 case opc_bastore:

   978                 case opc_castore:

   979                 case opc_sastore:

   980                     emit(out, "@3.at(@2, @1);",

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

   982                     break;

   983                 case opc_laload:

   984                     emit(out, "var @3 = @2.at(@1);",

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

   986                     break;

   987                 case opc_faload:

   988                     emit(out, "var @3 = @2.at(@1);",

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

   990                     break;

   991                 case opc_daload:

   992                     emit(out, "var @3 = @2.at(@1);",

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

   994                     break;

   995                 case opc_aaload:

   996                     emit(out, "var @3 = @2.at(@1);",

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

   998                     break;

   999                 case opc_iaload:

  1000                 case opc_baload:

  1001                 case opc_caload:

  1002                 case opc_saload:

  1003                     emit(out, "var @3 = @2.at(@1);",

  1004                          smapper.popI(), smapper.popA(), smapper.pushI());

  1005                     break;

  1006                 case opc_pop:

  1007                 case opc_pop2:

  1008                     smapper.pop(1);

  1009                     debug("/* pop */");

  1010                     break;

  1011                 case opc_dup: {

  1012                     final Variable v = smapper.get(0);

  1013                     emit(out, "var @1 = @2;", smapper.pushT(v.getType()), v);

  1014                     break;

  1015                 }

  1016                 case opc_dup2: {

  1017                     if (smapper.get(0).isCategory2()) {

  1018                         final Variable v = smapper.get(0);

  1019                         emit(out, "var @1 = @2;",

  1020                              smapper.pushT(v.getType()), v);

  1021                     } else {

  1022                         final Variable v1 = smapper.get(0);

  1023                         final Variable v2 = smapper.get(1);

  1024                         emit(out, "var @1 = @2, @3 = @4;",

  1025                              smapper.pushT(v2.getType()), v2,

  1026                              smapper.pushT(v1.getType()), v1);

  1027                     }

  1028                     break;

  1029                 }

  1030                 case opc_dup_x1: {

  1031                     final Variable vi1 = smapper.pop();

  1032                     final Variable vi2 = smapper.pop();

  1033                     final Variable vo3 = smapper.pushT(vi1.getType());

  1034                     final Variable vo2 = smapper.pushT(vi2.getType());

  1035                     final Variable vo1 = smapper.pushT(vi1.getType());

  1037                     emit(out, "var @1 = @2, @3 = @4, @5 = @6;",

  1038                          vo1, vi1, vo2, vi2, vo3, vo1);

  1039                     break;

  1040                 }

  1041                 case opc_dup_x2: {

  1042                     if (smapper.get(1).isCategory2()) {

  1043                         final Variable vi1 = smapper.pop();

  1044                         final Variable vi2 = smapper.pop();

  1045                         final Variable vo3 = smapper.pushT(vi1.getType());

  1046                         final Variable vo2 = smapper.pushT(vi2.getType());

  1047                         final Variable vo1 = smapper.pushT(vi1.getType());

  1049                         emit(out, "var @1 = @2, @3 = @4, @5 = @6;",

  1050                              vo1, vi1, vo2, vi2, vo3, vo1);

  1051                     } else {

  1052                         final Variable vi1 = smapper.pop();

  1053                         final Variable vi2 = smapper.pop();

  1054                         final Variable vi3 = smapper.pop();

  1055                         final Variable vo4 = smapper.pushT(vi1.getType());

  1056                         final Variable vo3 = smapper.pushT(vi3.getType());

  1057                         final Variable vo2 = smapper.pushT(vi2.getType());

  1058                         final Variable vo1 = smapper.pushT(vi1.getType());

  1060                         emit(out, "var @1 = @2, @3 = @4, @5 = @6, @7 = @8;",

  1061                              vo1, vi1, vo2, vi2, vo3, vi3, vo4, vo1);

  1062                     }

  1063                     break;

  1064                 }

  1065                 case opc_bipush:

  1066                     emit(out, "var @1 = @2;",

  1067                          smapper.pushI(), Integer.toString(byteCodes[++i]));

  1068                     break;

  1069                 case opc_sipush:

  1070                     emit(out, "var @1 = @2;",

  1071                          smapper.pushI(),

  1072                          Integer.toString(readIntArg(byteCodes, i)));

  1073                     i += 2;

  1074                     break;

  1075                 case opc_getfield: {

  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, "var @2 = @1.fld_@3;",

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

  1081                     i += 2;

  1082                     break;

  1083                 }

  1084                 case opc_getstatic: {

  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, "var @1 = @2(false).constructor.@3;",

  1089                          smapper.pushT(type),

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

  1091                     i += 2;

  1092                     addReference(fi[0]);

  1093                     break;

  1094                 }

  1095                 case opc_putfield: {

  1096                     int indx = readIntArg(byteCodes, i);

  1097                     String[] fi = jc.getFieldInfoName(indx);

  1098                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1099                     emit(out, "@2.fld_@3 = @1;",

  1100                          smapper.popT(type), smapper.popA(), fi[1]);

  1101                     i += 2;

  1102                     break;

  1103                 }

  1104                 case opc_putstatic: {

  1105                     int indx = readIntArg(byteCodes, i);

  1106                     String[] fi = jc.getFieldInfoName(indx);

  1107                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1108                     emit(out, "@1(false).constructor.@2 = @3;",

  1109                          accessClass(fi[0].replace('/', '_')), fi[1],

  1110                          smapper.popT(type));

  1111                     i += 2;

  1112                     addReference(fi[0]);

  1113                     break;

  1114                 }

  1115                 case opc_checkcast: {

  1116                     int indx = readIntArg(byteCodes, i);

  1117                     final String type = jc.getClassName(indx);

  1118                     if (!type.startsWith("[")) {

  1119                         // no way to check arrays right now

  1120                         // XXX proper exception

  1121                         emit(out,

  1122                              "if (@1 !== null && !@1.$instOf_@2) throw {};",

  1123                              smapper.getA(0), type.replace('/', '_'));

  1124                     }

  1125                     i += 2;

  1126                     break;

  1127                 }

  1128                 case opc_instanceof: {

  1129                     int indx = readIntArg(byteCodes, i);

  1130                     final String type = jc.getClassName(indx);

  1131                     emit(out, "var @2 = @1.$instOf_@3 ? 1 : 0;",

  1132                          smapper.popA(), smapper.pushI(),

  1133                          type.replace('/', '_'));

  1134                     i += 2;

  1135                     break;

  1136                 }

  1137                 case opc_athrow: {

  1138                     final Variable v = smapper.popA();

  1139                     smapper.clear();

  1141                     emit(out, "{ var @1 = @2; throw @2; }",

  1142                          smapper.pushA(), v);

  1143                     break;

  1144                 }

  1146                 case opc_monitorenter: {

  1147                     out.append("/* monitor enter */");

  1148                     smapper.popA();

  1149                     break;

  1150                 }

  1152                 case opc_monitorexit: {

  1153                     out.append("/* monitor exit */");

  1154                     smapper.popA();

  1155                     break;

  1156                 }

  1158                 default: {

  1159                     emit(out, "throw 'unknown bytecode @1';",

  1160                          Integer.toString(c));

  1161                 }

  1162             }

  1163             if (debug(" //")) {

  1164                 for (int j = prev; j <= i; j++) {

  1165                     out.append(" ");

  1166                     final int cc = readByte(byteCodes, j);

  1167                     out.append(Integer.toString(cc));

  1168                 }

  1169             }

  1170             out.append("\n");

  1171         }

  1172         if (previousTrap != null) {

  1173             generateCatch(previousTrap);

  1174         }

  1175         out.append("  }\n");

  1176         out.append("};");

  1177     }

  1179     private int generateIf(byte[] byteCodes, int i,

  1180                            final Variable v2, final Variable v1,

  1181                            final String test) throws IOException {

  1182         int indx = i + readIntArg(byteCodes, i);

  1183         out.append("if (").append(v1)

  1184            .append(' ').append(test).append(' ')

  1185            .append(v2).append(") { gt = " + indx)

  1186            .append("; continue; }");

  1187         return i + 2;

  1188     }

  1190     private int readIntArg(byte[] byteCodes, int offsetInstruction) {

  1191         final int indxHi = byteCodes[offsetInstruction + 1] << 8;

  1192         final int indxLo = byteCodes[offsetInstruction + 2];

  1193         return (indxHi & 0xffffff00) | (indxLo & 0xff);

  1194     }

  1195     private int readInt4(byte[] byteCodes, int offsetInstruction) {

  1196         final int d = byteCodes[offsetInstruction + 0] << 24;

  1197         final int c = byteCodes[offsetInstruction + 1] << 16;

  1198         final int b = byteCodes[offsetInstruction + 2] << 8;

  1199         final int a = byteCodes[offsetInstruction + 3];

  1200         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

  1201     }

  1202     private int readByte(byte[] byteCodes, int offsetInstruction) {

  1203         return byteCodes[offsetInstruction] & 0xff;

  1204     }

  1206     private static void countArgs(String descriptor, char[] returnType, StringBuilder sig, StringBuilder cnt) {

  1207         int i = 0;

  1208         Boolean count = null;

  1209         boolean array = false;

  1210         sig.append("__");

  1211         int firstPos = sig.length();

  1212         while (i < descriptor.length()) {

  1213             char ch = descriptor.charAt(i++);

  1214             switch (ch) {

  1215                 case '(':

  1216                     count = true;

  1217                     continue;

  1218                 case ')':

  1219                     count = false;

  1220                     continue;

  1221                 case 'B':

  1222                 case 'C':

  1223                 case 'D':

  1224                 case 'F':

  1225                 case 'I':

  1226                 case 'J':

  1227                 case 'S':

  1228                 case 'Z':

  1229                     if (count) {

  1230                         if (array) {

  1231                             sig.append("_3");

  1232                         }

  1233                         sig.append(ch);

  1234                         if (ch == 'J' || ch == 'D') {

  1235                             cnt.append('1');

  1236                         } else {

  1237                             cnt.append('0');

  1238                         }

  1239                     } else {

  1240                         sig.insert(firstPos, ch);

  1241                         if (array) {

  1242                             returnType[0] = '[';

  1243                             sig.insert(firstPos, "_3");

  1244                         } else {

  1245                             returnType[0] = ch;

  1246                         }

  1247                     }

  1248                     array = false;

  1249                     continue;

  1250                 case 'V':

  1251                     assert !count;

  1252                     returnType[0] = 'V';

  1253                     sig.insert(firstPos, 'V');

  1254                     continue;

  1255                 case 'L':

  1256                     int next = descriptor.indexOf(';', i);

  1257                     String realSig = mangleSig(descriptor, i - 1, next + 1);

  1258                     if (count) {

  1259                         if (array) {

  1260                             sig.append("_3");

  1261                         }

  1262                         sig.append(realSig);

  1263                         cnt.append('0');

  1264                     } else {

  1265                         sig.insert(firstPos, realSig);

  1266                         if (array) {

  1267                             sig.insert(firstPos, "_3");

  1268                         }

  1269                         returnType[0] = 'L';

  1270                     }

  1271                     i = next + 1;

  1272                     array = false;

  1273                     continue;

  1274                 case '[':

  1275                     array = true;

  1276                     continue;

  1277                 default:

  1278                     throw new IllegalStateException("Invalid char: " + ch);

  1279             }

  1280         }

  1281     }

  1283     private static String mangleSig(String txt, int first, int last) {

  1284         StringBuilder sb = new StringBuilder();

  1285         for (int i = first; i < last; i++) {

  1286             final char ch = txt.charAt(i);

  1287             switch (ch) {

  1288                 case '/': sb.append('_'); break;

  1289                 case '_': sb.append("_1"); break;

  1290                 case ';': sb.append("_2"); break;

  1291                 case '[': sb.append("_3"); break;

  1292                 default: sb.append(ch); break;

  1293             }

  1294         }

  1295         return sb.toString();

  1296     }

  1298     private static String findMethodName(MethodData m, StringBuilder cnt) {

  1299         StringBuilder name = new StringBuilder();

  1300         if ("<init>".equals(m.getName())) { // NOI18N

  1301             name.append("cons"); // NOI18N

  1302         } else if ("<clinit>".equals(m.getName())) { // NOI18N

  1303             name.append("class"); // NOI18N

  1304         } else {

  1305             name.append(m.getName());

  1306         }

  1308         countArgs(m.getInternalSig(), new char[1], name, cnt);

  1309         return name.toString();

  1310     }

  1312     static String findMethodName(String[] mi, StringBuilder cnt, char[] returnType) {

  1313         StringBuilder name = new StringBuilder();

  1314         String descr = mi[2];//mi.getDescriptor();

  1315         String nm= mi[1];

  1316         if ("<init>".equals(nm)) { // NOI18N

  1317             name.append("cons"); // NOI18N

  1318         } else {

  1319             name.append(nm);

  1320         }

  1321         countArgs(descr, returnType, name, cnt);

  1322         return name.toString();

  1323     }

  1325     private int invokeStaticMethod(byte[] byteCodes, int i, final StackMapper mapper, boolean isStatic)

  1326     throws IOException {

  1327         int methodIndex = readIntArg(byteCodes, i);

  1328         String[] mi = jc.getFieldInfoName(methodIndex);

  1329         char[] returnType = { 'V' };

  1330         StringBuilder cnt = new StringBuilder();

  1331         String mn = findMethodName(mi, cnt, returnType);

  1333         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1334         final Variable[] vars = new Variable[numArguments];

  1336         for (int j = numArguments - 1; j >= 0; --j) {

  1337             vars[j] = mapper.pop();

  1338         }

  1340         if (returnType[0] != 'V') {

  1341             out.append("var ")

  1342                .append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1343                .append(" = ");

  1344         }

  1346         final String in = mi[0];

  1347         out.append(accessClass(in.replace('/', '_')));

  1348         out.append("(false).");

  1349         if (mn.startsWith("cons_")) {

  1350             out.append("constructor.");

  1351         }

  1352         out.append(mn);

  1353         if (isStatic) {

  1354             out.append('(');

  1355         } else {

  1356             out.append(".call(");

  1357         }

  1358         if (numArguments > 0) {

  1359             out.append(vars[0]);

  1360             for (int j = 1; j < numArguments; ++j) {

  1361                 out.append(", ");

  1362                 out.append(vars[j]);

  1363             }

  1364         }

  1365         out.append(");");

  1366         i += 2;

  1367         addReference(in);

  1368         return i;

  1369     }

  1370     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackMapper mapper)

  1371     throws IOException {

  1372         int methodIndex = readIntArg(byteCodes, i);

  1373         String[] mi = jc.getFieldInfoName(methodIndex);

  1374         char[] returnType = { 'V' };

  1375         StringBuilder cnt = new StringBuilder();

  1376         String mn = findMethodName(mi, cnt, returnType);

  1378         final int numArguments = cnt.length() + 1;

  1379         final Variable[] vars = new Variable[numArguments];

  1381         for (int j = numArguments - 1; j >= 0; --j) {

  1382             vars[j] = mapper.pop();

  1383         }

  1385         if (returnType[0] != 'V') {

  1386             out.append("var ")

  1387                .append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1388                .append(" = ");

  1389         }

  1391         out.append(vars[0]).append('.');

  1392         out.append(mn);

  1393         out.append('(');

  1394         String sep = "";

  1395         for (int j = 1; j < numArguments; ++j) {

  1396             out.append(sep);

  1397             out.append(vars[j]);

  1398             sep = ", ";

  1399         }

  1400         out.append(");");

  1401         i += 2;

  1402         return i;

  1403     }

  1405     private void addReference(String cn) throws IOException {

  1406         if (requireReference(cn)) {

  1407             debug(" /* needs " + cn + " */");

  1408         }

  1409     }

  1411     private void outType(String d, StringBuilder out) {

  1412         int arr = 0;

  1413         while (d.charAt(0) == '[') {

  1414             out.append('A');

  1415             d = d.substring(1);

  1416         }

  1417         if (d.charAt(0) == 'L') {

  1418             assert d.charAt(d.length() - 1) == ';';

  1419             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1420         } else {

  1421             out.append(d);

  1422         }

  1423     }

  1425     private String encodeConstant(int entryIndex) throws IOException {

  1426         String[] classRef = { null };

  1427         String s = jc.stringValue(entryIndex, classRef);

  1428         if (classRef[0] != null) {

  1429             addReference(classRef[0]);

  1430             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1431         }

  1432         return s;

  1433     }

  1435     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1436         byte[] arr = m.findAnnotationData(true);

  1437         if (arr == null) {

  1438             return null;

  1439         }

  1440         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1441         class P extends AnnotationParser {

  1442             public P() {

  1443                 super(false);

  1444             }

  1446             int cnt;

  1447             String[] args = new String[30];

  1448             String body;

  1450             @Override

  1451             protected void visitAttr(String type, String attr, String at, String value) {

  1452                 if (type.equals(jvmType)) {

  1453                     if ("body".equals(attr)) {

  1454                         body = value;

  1455                     } else if ("args".equals(attr)) {

  1456                         args[cnt++] = value;

  1457                     } else {

  1458                         throw new IllegalArgumentException(attr);

  1459                     }

  1460                 }

  1461             }

  1462         }

  1463         P p = new P();

  1464         p.parse(arr, jc);

  1465         if (p.body == null) {

  1466             return null;

  1467         }

  1468         StringBuilder cnt = new StringBuilder();

  1469         final String mn = findMethodName(m, cnt);

  1470         out.append(prefix).append(mn);

  1471         out.append(" = function(");

  1472         String space = "";

  1473         int index = 0;

  1474         for (int i = 0; i < cnt.length(); i++) {

  1475             out.append(space);

  1476             space = outputArg(out, p.args, index);

  1477             index++;

  1478         }

  1479         out.append(") {").append("\n");

  1480         out.append(p.body);

  1481         out.append("\n}\n");

  1482         return mn;

  1483     }

  1484     private static String className(ClassData jc) {

  1485         //return jc.getName().getInternalName().replace('/', '_');

  1486         return jc.getClassName().replace('/', '_');

  1487     }

  1489     private static String[] findAnnotation(

  1490         byte[] arr, ClassData cd, final String className,

  1491         final String... attrNames

  1492     ) throws IOException {

  1493         if (arr == null) {

  1494             return null;

  1495         }

  1496         final String[] values = new String[attrNames.length];

  1497         final boolean[] found = { false };

  1498         final String jvmType = "L" + className.replace('.', '/') + ";";

  1499         AnnotationParser ap = new AnnotationParser(false) {

  1500             @Override

  1501             protected void visitAttr(String type, String attr, String at, String value) {

  1502                 if (type.equals(jvmType)) {

  1503                     found[0] = true;

  1504                     for (int i = 0; i < attrNames.length; i++) {

  1505                         if (attrNames[i].equals(attr)) {

  1506                             values[i] = value;

  1507                         }

  1508                     }

  1509                 }

  1510             }

  1512         };

  1513         ap.parse(arr, cd);

  1514         return found[0] ? values : null;

  1515     }

  1517     private CharSequence initField(FieldData v) {

  1518         final String is = v.getInternalSig();

  1519         if (is.length() == 1) {

  1520             switch (is.charAt(0)) {

  1521                 case 'S':

  1522                 case 'J':

  1523                 case 'B':

  1524                 case 'Z':

  1525                 case 'C':

  1526                 case 'I': return " = 0;";

  1527                 case 'F':

  1528                 case 'D': return " = 0.0;";

  1529                 default:

  1530                     throw new IllegalStateException(is);

  1531             }

  1532         }

  1533         return " = null;";

  1534     }

  1536     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1537         AnnotationParser ap = new AnnotationParser(true) {

  1538             int anno;

  1539             int cnt;

  1541             @Override

  1542             protected void visitAnnotationStart(String type) throws IOException {

  1543                 if (anno++ > 0) {

  1544                     out.append(",");

  1545                 }

  1546                 out.append('"').append(type).append("\" : {\n");

  1547                 cnt = 0;

  1548             }

  1550             @Override

  1551             protected void visitAnnotationEnd(String type) throws IOException {

  1552                 out.append("\n}\n");

  1553             }

  1555             @Override

  1556             protected void visitAttr(String type, String attr, String attrType, String value)

  1557             throws IOException {

  1558                 if (attr == null) {

  1559                     return;

  1560                 }

  1561                 if (cnt++ > 0) {

  1562                     out.append(",\n");

  1563                 }

  1564                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1565             }

  1566         };

  1567         ap.parse(data, cd);

  1568     }

  1570     private static String outputArg(Appendable out, String[] args, int indx) throws IOException {

  1571         final String name = args[indx];

  1572         if (name == null) {

  1573             return "";

  1574         }

  1575         if (name.contains(",")) {

  1576             throw new IOException("Wrong parameter with ',': " + name);

  1577         }

  1578         out.append(name);

  1579         return ",";

  1580     }

  1582     private static void emit(final Appendable out,

  1583                              final String format,

  1584                              final CharSequence... params) throws IOException {

  1585         final int length = format.length();

  1587         int processed = 0;

  1588         int paramOffset = format.indexOf('@');

  1589         while ((paramOffset != -1) && (paramOffset < (length - 1))) {

  1590             final char paramChar = format.charAt(paramOffset + 1);

  1591             if ((paramChar >= '1') && (paramChar <= '9')) {

  1592                 final int paramIndex = paramChar - '0' - 1;

  1594                 out.append(format, processed, paramOffset);

  1595                 out.append(params[paramIndex]);

  1597                 ++paramOffset;

  1598                 processed = paramOffset + 1;

  1599             }

  1601             paramOffset = format.indexOf('@', paramOffset + 1);

  1602         }

  1604         out.append(format, processed, length);

  1605     }

  1607     private void generateCatch(TrapData[] traps) throws IOException {

  1608         out.append("} catch (e) {\n");

  1609         int finallyPC = -1;

  1610         for (TrapData e : traps) {

  1611             if (e == null) {

  1612                 break;

  1613             }

  1614             if (e.catch_cpx != 0) { //not finally

  1615                 final String classInternalName = jc.getClassName(e.catch_cpx);

  1616                 addReference(classInternalName);

  1617                 if ("java/lang/Throwable".equals(classInternalName)) {

  1618                     out.append("if (e.$instOf_java_lang_Throwable) {");

  1619                     out.append("  var stA0 = e;");

  1620                     out.append("} else {");

  1621                     out.append("  var stA0 = vm.java_lang_Throwable(true);");

  1622                     out.append("  vm.java_lang_Throwable.cons__VLjava_lang_String_2.call(stA0, e.toString());");

  1623                     out.append("}");

  1624                     out.append("gt=" + e.handler_pc + "; continue;");

  1625                 } else {

  1626                     out.append("if (e.$instOf_" + classInternalName.replace('/', '_') + ") {");

  1627                     out.append("gt=" + e.handler_pc + "; var stA0 = e; continue;");

  1628                     out.append("}\n");

  1629                 }

  1630             } else {

  1631                 finallyPC = e.handler_pc;

  1632             }

  1633         }

  1634         if (finallyPC == -1) {

  1635             out.append("throw e;");

  1636         } else {

  1637             out.append("gt=" + finallyPC + "; var stA0 = e; continue;");

  1638         }

  1639         out.append("\n}");

  1640     }

  1641 }

author	Lubomir Nerad <lubomir.nerad@oracle.com>
	Fri, 18 Jan 2013 15:33:03 +0100
branch	registers
changeset 474	859cc3a0b8f0
parent 459	a2871a3fd4c5
child 488	9288ecf9657c
child 585	fe1a07c17681
permissions	-rw-r--r--