hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@eaf4e8387065

     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.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.*;

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

    30  *

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

    32  */

    33 public abstract class ByteCodeToJavaScript {

    34     private ClassData jc;

    35     final Appendable out;

    37     protected ByteCodeToJavaScript(Appendable out) {

    38         this.out = out;

    39     }

    41     /* Collects additional required resources.

    42      *

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

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

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

    46      */

    47     protected abstract boolean requireReference(String internalClassName);

    49     /*

    50      * @param resourcePath name of resources to read

    51      */

    52     protected abstract void requireScript(String resourcePath);

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

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

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

    57      *

    58      * @param className suggested name of the class

    59      */

    60     protected String assignClass(String className) {

    61         return className + " = ";

    62     }

    64     /**

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

    66      *

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

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

    69      *

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

    71      */

    73     public String compile(InputStream classFile) throws IOException {

    74         this.jc = new ClassData(classFile);

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

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

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

    78             "resource", "processByteCode"

    79         );

    80         if (arr != null) {

    81             requireScript(arr[0]);

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

    83                 return null;

    84             }

    85         }

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

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

    88             "container", "prototype"

    89         );

    90         StringArray toInitilize = new StringArray();

    91         final String className = className(jc);

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

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

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

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

    96             if (v.isStatic()) {

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

    98             }

    99         }

   100         if (proto == null) {

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

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

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

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

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

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

   107         } else {

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

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

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

   111         }

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

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

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

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

   116                 "name", "value"

   117             );

   118             if (only != null) {

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

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

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

   122                 }

   123                 continue;

   124             }

   125             String mn;

   126             if (m.isStatic()) {

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

   128             } else {

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

   130             }

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

   132             if (runAnno != null) {

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

   134                 generateAnno(jc, out, runAnno);

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

   136             }

   137         }

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

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

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

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

   142         }

   143         out.append("\n    CLS.$class = java_lang_Class(true);");

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

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

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

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

   148         if (classAnno != null) {

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

   150             generateAnno(jc, out, classAnno);

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

   152         }

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

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

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

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

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

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

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

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

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

   162                 "name", "value"

   163             );

   164             if (only != null) {

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

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

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

   168                 }

   169                 continue;

   170             }

   171             if (!v.isStatic()) {

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

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

   174             }

   175         }

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

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

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

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

   180         StringBuilder sb = new StringBuilder();

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

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

   183         }

   184         return sb.toString();

   185     }

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

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

   188         if (jsb != null) {

   189             return jsb;

   190         }

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

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

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

   194         }

   195         generateMethod(prefix, mn, m);

   196         return mn;

   197     }

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

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

   201         if (jsb != null) {

   202             return jsb;

   203         }

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

   205         generateMethod(prefix, mn, m);

   206         return mn;

   207     }

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

   210             throws IOException {

   211         final StackMapIterator stackMapIterator = m.createStackMapIterator();

   212         final LocalsMapper lmapper =

   213                 new LocalsMapper(stackMapIterator.getArguments());

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

   216         lmapper.outputArguments(out);

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

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

   220         if (byteCodes == null) {

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

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

   223             out.append("};");

   224             return;

   225         }

   227         final StackMapper smapper = new StackMapper();

   229         final int maxLocals = m.getMaxLocals();

   230         if (maxLocals > 0) {

   231             // TODO: generate only used local variables

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

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

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

   235                     out.append(", ");

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

   237                 }

   238                 out.append(';');

   239             }

   240         }

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

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

   244         final int maxStack = m.getMaxStack();

   245         if (maxStack > 0) {

   246             // TODO: generate only used stack variables

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

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

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

   250                     out.append(", ");

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

   252                 }

   253                 out.append(';');

   254             }

   255         }

   257         int lastStackFrame = -1;

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

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

   261             int prev = i;

   262             stackMapIterator.advanceTo(i);

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

   264                 lastStackFrame = stackMapIterator.getFrameIndex();

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

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

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

   268             } else {

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

   270             }

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

   272             switch (c) {

   273                 case opc_aload_0:

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

   275                     break;

   276                 case opc_iload_0:

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

   278                     break;

   279                 case opc_lload_0:

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

   281                     break;

   282                 case opc_fload_0:

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

   284                     break;

   285                 case opc_dload_0:

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

   287                     break;

   288                 case opc_aload_1:

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

   290                     break;

   291                 case opc_iload_1:

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

   293                     break;

   294                 case opc_lload_1:

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

   296                     break;

   297                 case opc_fload_1:

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

   299                     break;

   300                 case opc_dload_1:

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

   302                     break;

   303                 case opc_aload_2:

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

   305                     break;

   306                 case opc_iload_2:

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

   308                     break;

   309                 case opc_lload_2:

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

   311                     break;

   312                 case opc_fload_2:

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

   314                     break;

   315                 case opc_dload_2:

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

   317                     break;

   318                 case opc_aload_3:

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

   320                     break;

   321                 case opc_iload_3:

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

   323                     break;

   324                 case opc_lload_3:

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

   326                     break;

   327                 case opc_fload_3:

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

   329                     break;

   330                 case opc_dload_3:

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

   332                     break;

   333                 case opc_iload: {

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

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

   336                     break;

   337                 }

   338                 case opc_lload: {

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

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

   341                     break;

   342                 }

   343                 case opc_fload: {

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

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

   346                     break;

   347                 }

   348                 case opc_dload: {

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

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

   351                     break;

   352                 }

   353                 case opc_aload: {

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

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

   356                     break;

   357                 }

   358                 case opc_istore: {

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

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

   361                     break;

   362                 }

   363                 case opc_lstore: {

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

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

   366                     break;

   367                 }

   368                 case opc_fstore: {

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

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

   371                     break;

   372                 }

   373                 case opc_dstore: {

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

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

   376                     break;

   377                 }

   378                 case opc_astore: {

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

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

   381                     break;

   382                 }

   383                 case opc_astore_0:

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

   385                     break;

   386                 case opc_istore_0:

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

   388                     break;

   389                 case opc_lstore_0:

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

   391                     break;

   392                 case opc_fstore_0:

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

   394                     break;

   395                 case opc_dstore_0:

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

   397                     break;

   398                 case opc_astore_1:

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

   400                     break;

   401                 case opc_istore_1:

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

   403                     break;

   404                 case opc_lstore_1:

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

   406                     break;

   407                 case opc_fstore_1:

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

   409                     break;

   410                 case opc_dstore_1:

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

   412                     break;

   413                 case opc_astore_2:

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

   415                     break;

   416                 case opc_istore_2:

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

   418                     break;

   419                 case opc_lstore_2:

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

   421                     break;

   422                 case opc_fstore_2:

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

   424                     break;

   425                 case opc_dstore_2:

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

   427                     break;

   428                 case opc_astore_3:

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

   430                     break;

   431                 case opc_istore_3:

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

   433                     break;

   434                 case opc_lstore_3:

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

   436                     break;

   437                 case opc_fstore_3:

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

   439                     break;

   440                 case opc_dstore_3:

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

   442                     break;

   443                 case opc_iadd:

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

   445                     break;

   446                 case opc_ladd:

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

   448                     break;

   449                 case opc_fadd:

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

   451                     break;

   452                 case opc_dadd:

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

   454                     break;

   455                 case opc_isub:

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

   457                     break;

   458                 case opc_lsub:

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

   460                     break;

   461                 case opc_fsub:

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

   463                     break;

   464                 case opc_dsub:

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

   466                     break;

   467                 case opc_imul:

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

   469                     break;

   470                 case opc_lmul:

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

   472                     break;

   473                 case opc_fmul:

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

   475                     break;

   476                 case opc_dmul:

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

   478                     break;

   479                 case opc_idiv:

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

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

   482                     break;

   483                 case opc_ldiv:

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

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

   486                     break;

   487                 case opc_fdiv:

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

   489                     break;

   490                 case opc_ddiv:

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

   492                     break;

   493                 case opc_irem:

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

   495                     break;

   496                 case opc_lrem:

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

   498                     break;

   499                 case opc_frem:

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

   501                     break;

   502                 case opc_drem:

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

   504                     break;

   505                 case opc_iand:

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

   507                     break;

   508                 case opc_land:

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

   510                     break;

   511                 case opc_ior:

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

   513                     break;

   514                 case opc_lor:

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

   516                     break;

   517                 case opc_ixor:

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

   519                     break;

   520                 case opc_lxor:

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

   522                     break;

   523                 case opc_ineg:

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

   525                     break;

   526                 case opc_lneg:

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

   528                     break;

   529                 case opc_fneg:

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

   531                     break;

   532                 case opc_dneg:

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

   534                     break;

   535                 case opc_ishl:

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

   537                     break;

   538                 case opc_lshl:

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

   540                     break;

   541                 case opc_ishr:

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

   543                     break;

   544                 case opc_lshr:

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

   546                     break;

   547                 case opc_iushr:

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

   549                     break;

   550                 case opc_lushr:

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

   552                     break;

   553                 case opc_iinc: {

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

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

   556                     if (incrBy == 1) {

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

   558                     } else {

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

   560                              lmapper.getI(varIndx),

   561                              Integer.toString(incrBy));

   562                     }

   563                     break;

   564                 }

   565                 case opc_return:

   566                     emit(out, "return;");

   567                     break;

   568                 case opc_ireturn:

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

   570                     break;

   571                 case opc_lreturn:

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

   573                     break;

   574                 case opc_freturn:

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

   576                     break;

   577                 case opc_dreturn:

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

   579                     break;

   580                 case opc_areturn:

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

   582                     break;

   583                 case opc_i2l:

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

   585                     break;

   586                 case opc_i2f:

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

   588                     break;

   589                 case opc_i2d:

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

   591                     break;

   592                 case opc_l2i:

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

   594                     break;

   595                     // max int check?

   596                 case opc_l2f:

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

   598                     break;

   599                 case opc_l2d:

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

   601                     break;

   602                 case opc_f2d:

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

   604                     break;

   605                 case opc_d2f:

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

   607                     break;

   608                 case opc_f2i:

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

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

   611                     break;

   612                 case opc_f2l:

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

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

   615                     break;

   616                 case opc_d2i:

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

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

   619                     break;

   620                 case opc_d2l:

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

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

   623                     break;

   624                 case opc_i2b:

   625                 case opc_i2c:

   626                 case opc_i2s:

   627                     out.append("/* number conversion */");

   628                     break;

   629                 case opc_aconst_null:

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

   631                     break;

   632                 case opc_iconst_m1:

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

   634                     break;

   635                 case opc_iconst_0:

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

   637                     break;

   638                 case opc_dconst_0:

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

   640                     break;

   641                 case opc_lconst_0:

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

   643                     break;

   644                 case opc_fconst_0:

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

   646                     break;

   647                 case opc_iconst_1:

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

   649                     break;

   650                 case opc_lconst_1:

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

   652                     break;

   653                 case opc_fconst_1:

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

   655                     break;

   656                 case opc_dconst_1:

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

   658                     break;

   659                 case opc_iconst_2:

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

   661                     break;

   662                 case opc_fconst_2:

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

   664                     break;

   665                 case opc_iconst_3:

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

   667                     break;

   668                 case opc_iconst_4:

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

   670                     break;

   671                 case opc_iconst_5:

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

   673                     break;

   674                 case opc_ldc: {

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

   676                     String v = encodeConstant(indx);

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

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

   679                     break;

   680                 }

   681                 case opc_ldc_w:

   682                 case opc_ldc2_w: {

   683                     int indx = readIntArg(byteCodes, i);

   684                     i += 2;

   685                     String v = encodeConstant(indx);

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

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

   688                     break;

   689                 }

   690                 case opc_lcmp:

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

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

   693                     break;

   694                 case opc_fcmpl:

   695                 case opc_fcmpg:

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

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

   698                     break;

   699                 case opc_dcmpl:

   700                 case opc_dcmpg:

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

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

   703                     break;

   704                 case opc_if_acmpeq:

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

   706                                    "===");

   707                     break;

   708                 case opc_if_acmpne:

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

   710                                    "!=");

   711                     break;

   712                 case opc_if_icmpeq:

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

   714                                    "==");

   715                     break;

   716                 case opc_ifeq: {

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

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

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

   720                     i += 2;

   721                     break;

   722                 }

   723                 case opc_ifne: {

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

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

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

   727                     i += 2;

   728                     break;

   729                 }

   730                 case opc_iflt: {

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

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

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

   734                     i += 2;

   735                     break;

   736                 }

   737                 case opc_ifle: {

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

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

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

   741                     i += 2;

   742                     break;

   743                 }

   744                 case opc_ifgt: {

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

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

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

   748                     i += 2;

   749                     break;

   750                 }

   751                 case opc_ifge: {

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

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

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

   755                     i += 2;

   756                     break;

   757                 }

   758                 case opc_ifnonnull: {

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

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

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

   762                     i += 2;

   763                     break;

   764                 }

   765                 case opc_ifnull: {

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

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

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

   769                     i += 2;

   770                     break;

   771                 }

   772                 case opc_if_icmpne:

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

   774                                    "!=");

   775                     break;

   776                 case opc_if_icmplt:

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

   778                                    "<");

   779                     break;

   780                 case opc_if_icmple:

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

   782                                    "<=");

   783                     break;

   784                 case opc_if_icmpgt:

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

   786                                    ">");

   787                     break;

   788                 case opc_if_icmpge:

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

   790                                    ">=");

   791                     break;

   792                 case opc_goto: {

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

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

   795                     i += 2;

   796                     break;

   797                 }

   798                 case opc_lookupswitch: {

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

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

   801                     table += 4;

   802                     int n = readInt4(byteCodes, table);

   803                     table += 4;

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

   805                     while (n-- > 0) {

   806                         int cnstnt = readInt4(byteCodes, table);

   807                         table += 4;

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

   809                         table += 4;

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

   811                     }

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

   813                     i = table - 1;

   814                     break;

   815                 }

   816                 case opc_tableswitch: {

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

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

   819                     table += 4;

   820                     int low = readInt4(byteCodes, table);

   821                     table += 4;

   822                     int high = readInt4(byteCodes, table);

   823                     table += 4;

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

   825                     while (low <= high) {

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

   827                         table += 4;

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

   829                         low++;

   830                     }

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

   832                     i = table - 1;

   833                     break;

   834                 }

   835                 case opc_invokeinterface: {

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

   837                     break;

   838                 }

   839                 case opc_invokevirtual:

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

   841                     break;

   842                 case opc_invokespecial:

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

   844                     break;

   845                 case opc_invokestatic:

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

   847                     break;

   848                 case opc_new: {

   849                     int indx = readIntArg(byteCodes, i);

   850                     String ci = jc.getClassName(indx);

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

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

   853                     addReference(ci);

   854                     i += 2;

   855                     break;

   856                 }

   857                 case opc_newarray:

   858                     ++i; // skip type of array

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

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

   861                     break;

   862                 case opc_anewarray:

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

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

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

   866                     break;

   867                 case opc_multianewarray: {

   868                     i += 2;

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

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

   871                        .append(").fillNulls();");

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

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

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

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

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

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

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

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

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

   881                             append(";");

   882                     }

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

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

   885                     }

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

   887                     break;

   888                 }

   889                 case opc_arraylength:

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

   891                     break;

   892                 case opc_lastore:

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

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

   895                     break;

   896                 case opc_fastore:

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

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

   899                     break;

   900                 case opc_dastore:

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

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

   903                     break;

   904                 case opc_aastore:

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

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

   907                     break;

   908                 case opc_iastore:

   909                 case opc_bastore:

   910                 case opc_castore:

   911                 case opc_sastore:

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

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

   914                     break;

   915                 case opc_laload:

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

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

   918                     break;

   919                 case opc_faload:

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

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

   922                     break;

   923                 case opc_daload:

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

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

   926                     break;

   927                 case opc_aaload:

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

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

   930                     break;

   931                 case opc_iaload:

   932                 case opc_baload:

   933                 case opc_caload:

   934                 case opc_saload:

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

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

   937                     break;

   938                 case opc_pop:

   939                 case opc_pop2:

   940                     smapper.pop(1);

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

   942                     break;

   943                 case opc_dup: {

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

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

   946                     break;

   947                 }

   948                 case opc_dup2: {

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

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

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

   952                     } else {

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

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

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

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

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

   958                     }

   959                     break;

   960                 }

   961                 case opc_dup_x1: {

   962                     final Variable vi1 = smapper.pop();

   963                     final Variable vi2 = smapper.pop();

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

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

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

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

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

   970                     break;

   971                 }

   972                 case opc_dup_x2: {

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

   974                         final Variable vi1 = smapper.pop();

   975                         final Variable vi2 = smapper.pop();

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

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

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

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

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

   982                     } else {

   983                         final Variable vi1 = smapper.pop();

   984                         final Variable vi2 = smapper.pop();

   985                         final Variable vi3 = smapper.pop();

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

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

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

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

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

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

   993                     }

   994                     break;

   995                 }

   996                 case opc_bipush:

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

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

   999                     break;

  1000                 case opc_sipush:

  1001                     emit(out, "@1 = @2;",

  1002                          smapper.pushI(),

  1003                          Integer.toString(readIntArg(byteCodes, i)));

  1004                     i += 2;

  1005                     break;

  1006                 case opc_getfield: {

  1007                     int indx = readIntArg(byteCodes, i);

  1008                     String[] fi = jc.getFieldInfoName(indx);

  1009                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1010                     emit(out, "@2 = @1.fld_@3;",

  1011                          smapper.popA(), smapper.pushT(type), fi[1]);

  1012                     i += 2;

  1013                     break;

  1014                 }

  1015                 case opc_getstatic: {

  1016                     int indx = readIntArg(byteCodes, i);

  1017                     String[] fi = jc.getFieldInfoName(indx);

  1018                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1019                     emit(out, "@1 = @2.@3;",

  1020                          smapper.pushT(type), fi[0].replace('/', '_'), fi[1]);

  1021                     i += 2;

  1022                     addReference(fi[0]);

  1023                     break;

  1024                 }

  1025                 case opc_putfield: {

  1026                     int indx = readIntArg(byteCodes, i);

  1027                     String[] fi = jc.getFieldInfoName(indx);

  1028                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1029                     emit(out, "@2.fld_@3 = @1;",

  1030                          smapper.popT(type), smapper.popA(), fi[1]);

  1031                     i += 2;

  1032                     break;

  1033                 }

  1034                 case opc_putstatic: {

  1035                     int indx = readIntArg(byteCodes, i);

  1036                     String[] fi = jc.getFieldInfoName(indx);

  1037                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1038                     emit(out, "@1.@2 = @3;",

  1039                          fi[0].replace('/', '_'), fi[1], smapper.popT(type));

  1040                     i += 2;

  1041                     addReference(fi[0]);

  1042                     break;

  1043                 }

  1044                 case opc_checkcast: {

  1045                     int indx = readIntArg(byteCodes, i);

  1046                     final String type = jc.getClassName(indx);

  1047                     if (!type.startsWith("[")) {

  1048                         // no way to check arrays right now

  1049                         // XXX proper exception

  1050                         emit(out, "if (@1.$instOf_@2 != 1) throw {};",

  1051                              smapper.getA(0), type.replace('/', '_'));

  1052                     }

  1053                     i += 2;

  1054                     break;

  1055                 }

  1056                 case opc_instanceof: {

  1057                     int indx = readIntArg(byteCodes, i);

  1058                     final String type = jc.getClassName(indx);

  1059                     emit(out, "@2 = @1.$instOf_@3 ? 1 : 0;",

  1060                          smapper.popA(), smapper.pushI(), type.replace('/', '_'));

  1061                     i += 2;

  1062                     break;

  1063                 }

  1064                 case opc_athrow: {

  1065                     final Variable v = smapper.popA();

  1066                     smapper.clear();

  1068                     emit(out, "{ @1 = @2; throw @2; }",

  1069                          smapper.pushA(), v);

  1070                     break;

  1071                 }

  1073                 case opc_monitorenter: {

  1074                     out.append("/* monitor enter */");

  1075                     smapper.popA();

  1076                     break;

  1077                 }

  1079                 case opc_monitorexit: {

  1080                     out.append("/* monitor exit */");

  1081                     smapper.popA();

  1082                     break;

  1083                 }

  1085                 default: {

  1086                     emit(out, "throw 'unknown bytecode @1';",

  1087                          Integer.toString(c));

  1088                 }

  1089             }

  1090             out.append(" //");

  1091             for (int j = prev; j <= i; j++) {

  1092                 out.append(" ");

  1093                 final int cc = readByte(byteCodes, j);

  1094                 out.append(Integer.toString(cc));

  1095             }

  1096             out.append("\n");

  1097         }

  1098         out.append("  }\n");

  1099         out.append("};");

  1100     }

  1102     private int generateIf(byte[] byteCodes, int i,

  1103                            final Variable v2, final Variable v1,

  1104                            final String test) throws IOException {

  1105         int indx = i + readIntArg(byteCodes, i);

  1106         out.append("if (").append(v1)

  1107            .append(' ').append(test).append(' ')

  1108            .append(v2).append(") { gt = " + indx)

  1109            .append("; continue; }");

  1110         return i + 2;

  1111     }

  1113     private int readIntArg(byte[] byteCodes, int offsetInstruction) {

  1114         final int indxHi = byteCodes[offsetInstruction + 1] << 8;

  1115         final int indxLo = byteCodes[offsetInstruction + 2];

  1116         return (indxHi & 0xffffff00) | (indxLo & 0xff);

  1117     }

  1118     private int readInt4(byte[] byteCodes, int offsetInstruction) {

  1119         final int d = byteCodes[offsetInstruction + 0] << 24;

  1120         final int c = byteCodes[offsetInstruction + 1] << 16;

  1121         final int b = byteCodes[offsetInstruction + 2] << 8;

  1122         final int a = byteCodes[offsetInstruction + 3];

  1123         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

  1124     }

  1125     private int readByte(byte[] byteCodes, int offsetInstruction) {

  1126         return byteCodes[offsetInstruction] & 0xff;

  1127     }

  1129     private static void countArgs(String descriptor, char[] returnType, StringBuilder sig, StringBuilder cnt) {

  1130         int i = 0;

  1131         Boolean count = null;

  1132         boolean array = false;

  1133         sig.append("__");

  1134         int firstPos = sig.length();

  1135         while (i < descriptor.length()) {

  1136             char ch = descriptor.charAt(i++);

  1137             switch (ch) {

  1138                 case '(':

  1139                     count = true;

  1140                     continue;

  1141                 case ')':

  1142                     count = false;

  1143                     continue;

  1144                 case 'B':

  1145                 case 'C':

  1146                 case 'D':

  1147                 case 'F':

  1148                 case 'I':

  1149                 case 'J':

  1150                 case 'S':

  1151                 case 'Z':

  1152                     if (count) {

  1153                         if (array) {

  1154                             sig.append("_3");

  1155                         }

  1156                         sig.append(ch);

  1157                         if (ch == 'J' || ch == 'D') {

  1158                             cnt.append('1');

  1159                         } else {

  1160                             cnt.append('0');

  1161                         }

  1162                     } else {

  1163                         sig.insert(firstPos, ch);

  1164                         if (array) {

  1165                             returnType[0] = '[';

  1166                             sig.insert(firstPos, "_3");

  1167                         } else {

  1168                             returnType[0] = ch;

  1169                         }

  1170                     }

  1171                     array = false;

  1172                     continue;

  1173                 case 'V':

  1174                     assert !count;

  1175                     returnType[0] = 'V';

  1176                     sig.insert(firstPos, 'V');

  1177                     continue;

  1178                 case 'L':

  1179                     int next = descriptor.indexOf(';', i);

  1180                     String realSig = mangleSig(descriptor, i - 1, next + 1);

  1181                     if (count) {

  1182                         if (array) {

  1183                             sig.append("_3");

  1184                         }

  1185                         sig.append(realSig);

  1186                         cnt.append('0');

  1187                     } else {

  1188                         sig.insert(firstPos, realSig);

  1189                         if (array) {

  1190                             sig.insert(firstPos, "_3");

  1191                         }

  1192                         returnType[0] = 'L';

  1193                     }

  1194                     i = next + 1;

  1195                     continue;

  1196                 case '[':

  1197                     array = true;

  1198                     continue;

  1199                 default:

  1200                     throw new IllegalStateException("Invalid char: " + ch);

  1201             }

  1202         }

  1203     }

  1205     private static String mangleSig(String txt, int first, int last) {

  1206         StringBuilder sb = new StringBuilder();

  1207         for (int i = first; i < last; i++) {

  1208             final char ch = txt.charAt(i);

  1209             switch (ch) {

  1210                 case '/': sb.append('_'); break;

  1211                 case '_': sb.append("_1"); break;

  1212                 case ';': sb.append("_2"); break;

  1213                 case '[': sb.append("_3"); break;

  1214                 default: sb.append(ch); break;

  1215             }

  1216         }

  1217         return sb.toString();

  1218     }

  1220     private static String findMethodName(MethodData m, StringBuilder cnt) {

  1221         StringBuilder name = new StringBuilder();

  1222         if ("<init>".equals(m.getName())) { // NOI18N

  1223             name.append("cons"); // NOI18N

  1224         } else if ("<clinit>".equals(m.getName())) { // NOI18N

  1225             name.append("class"); // NOI18N

  1226         } else {

  1227             name.append(m.getName());

  1228         }

  1230         countArgs(m.getInternalSig(), new char[1], name, cnt);

  1231         return name.toString();

  1232     }

  1234     static String findMethodName(String[] mi, StringBuilder cnt, char[] returnType) {

  1235         StringBuilder name = new StringBuilder();

  1236         String descr = mi[2];//mi.getDescriptor();

  1237         String nm= mi[1];

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

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

  1240         } else {

  1241             name.append(nm);

  1242         }

  1243         countArgs(descr, returnType, name, cnt);

  1244         return name.toString();

  1245     }

  1247     private int invokeStaticMethod(byte[] byteCodes, int i, final StackMapper mapper, boolean isStatic)

  1248     throws IOException {

  1249         int methodIndex = readIntArg(byteCodes, i);

  1250         String[] mi = jc.getFieldInfoName(methodIndex);

  1251         char[] returnType = { 'V' };

  1252         StringBuilder cnt = new StringBuilder();

  1253         String mn = findMethodName(mi, cnt, returnType);

  1255         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1256         final Variable[] vars = new Variable[numArguments];

  1258         for (int j = numArguments - 1; j >= 0; --j) {

  1259             vars[j] = mapper.pop();

  1260         }

  1262         if (returnType[0] != 'V') {

  1263             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1264                .append(" = ");

  1265         }

  1267         final String in = mi[0];

  1268         out.append(in.replace('/', '_'));

  1269         out.append("(false).");

  1270         out.append(mn);

  1271         out.append('(');

  1272         if (numArguments > 0) {

  1273             out.append(vars[0]);

  1274             for (int j = 1; j < numArguments; ++j) {

  1275                 out.append(", ");

  1276                 out.append(vars[j]);

  1277             }

  1278         }

  1279         out.append(");");

  1280         i += 2;

  1281         addReference(in);

  1282         return i;

  1283     }

  1284     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackMapper mapper)

  1285     throws IOException {

  1286         int methodIndex = readIntArg(byteCodes, i);

  1287         String[] mi = jc.getFieldInfoName(methodIndex);

  1288         char[] returnType = { 'V' };

  1289         StringBuilder cnt = new StringBuilder();

  1290         String mn = findMethodName(mi, cnt, returnType);

  1292         final int numArguments = cnt.length() + 1;

  1293         final Variable[] vars = new Variable[numArguments];

  1295         for (int j = numArguments - 1; j >= 0; --j) {

  1296             vars[j] = mapper.pop();

  1297         }

  1299         if (returnType[0] != 'V') {

  1300             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1301                .append(" = ");

  1302         }

  1304         out.append(vars[0]).append('.');

  1305         out.append(mn);

  1306         out.append('(');

  1307         out.append(vars[0]);

  1308         for (int j = 1; j < numArguments; ++j) {

  1309             out.append(", ");

  1310             out.append(vars[j]);

  1311         }

  1312         out.append(");");

  1313         i += 2;

  1314         return i;

  1315     }

  1317     private void addReference(String cn) throws IOException {

  1318         if (requireReference(cn)) {

  1319             out.append(" /* needs ").append(cn).append(" */");

  1320         }

  1321     }

  1323     private void outType(String d, StringBuilder out) {

  1324         int arr = 0;

  1325         while (d.charAt(0) == '[') {

  1326             out.append('A');

  1327             d = d.substring(1);

  1328         }

  1329         if (d.charAt(0) == 'L') {

  1330             assert d.charAt(d.length() - 1) == ';';

  1331             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1332         } else {

  1333             out.append(d);

  1334         }

  1335     }

  1337     private String encodeConstant(int entryIndex) throws IOException {

  1338         String[] classRef = { null };

  1339         String s = jc.stringValue(entryIndex, classRef);

  1340         if (classRef[0] != null) {

  1341             addReference(classRef[0]);

  1342         }

  1343         return s;

  1344     }

  1346     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1347         byte[] arr = m.findAnnotationData(true);

  1348         if (arr == null) {

  1349             return null;

  1350         }

  1351         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1352         class P extends AnnotationParser {

  1353             public P() {

  1354                 super(false);

  1355             }

  1357             int cnt;

  1358             String[] args = new String[30];

  1359             String body;

  1361             @Override

  1362             protected void visitAttr(String type, String attr, String at, String value) {

  1363                 if (type.equals(jvmType)) {

  1364                     if ("body".equals(attr)) {

  1365                         body = value;

  1366                     } else if ("args".equals(attr)) {

  1367                         args[cnt++] = value;

  1368                     } else {

  1369                         throw new IllegalArgumentException(attr);

  1370                     }

  1371                 }

  1372             }

  1373         }

  1374         P p = new P();

  1375         p.parse(arr, jc);

  1376         if (p.body == null) {

  1377             return null;

  1378         }

  1379         StringBuilder cnt = new StringBuilder();

  1380         final String mn = findMethodName(m, cnt);

  1381         out.append(prefix).append(mn);

  1382         out.append(" = function(");

  1383         String space;

  1384         int index;

  1385         if (!isStatic) {

  1386             out.append(p.args[0]);

  1387             space = ",";

  1388             index = 1;

  1389         } else {

  1390             space = "";

  1391             index = 0;

  1392         }

  1393         for (int i = 0; i < cnt.length(); i++) {

  1394             out.append(space);

  1395             out.append(p.args[index]);

  1396             index++;

  1397             space = ",";

  1398         }

  1399         out.append(") {").append("\n");

  1400         out.append(p.body);

  1401         out.append("\n}\n");

  1402         return mn;

  1403     }

  1404     private static String className(ClassData jc) {

  1405         //return jc.getName().getInternalName().replace('/', '_');

  1406         return jc.getClassName().replace('/', '_');

  1407     }

  1409     private static String[] findAnnotation(

  1410         byte[] arr, ClassData cd, final String className,

  1411         final String... attrNames

  1412     ) throws IOException {

  1413         if (arr == null) {

  1414             return null;

  1415         }

  1416         final String[] values = new String[attrNames.length];

  1417         final boolean[] found = { false };

  1418         final String jvmType = "L" + className.replace('.', '/') + ";";

  1419         AnnotationParser ap = new AnnotationParser(false) {

  1420             @Override

  1421             protected void visitAttr(String type, String attr, String at, String value) {

  1422                 if (type.equals(jvmType)) {

  1423                     found[0] = true;

  1424                     for (int i = 0; i < attrNames.length; i++) {

  1425                         if (attrNames[i].equals(attr)) {

  1426                             values[i] = value;

  1427                         }

  1428                     }

  1429                 }

  1430             }

  1432         };

  1433         ap.parse(arr, cd);

  1434         return found[0] ? values : null;

  1435     }

  1437     private CharSequence initField(FieldData v) {

  1438         final String is = v.getInternalSig();

  1439         if (is.length() == 1) {

  1440             switch (is.charAt(0)) {

  1441                 case 'S':

  1442                 case 'J':

  1443                 case 'B':

  1444                 case 'Z':

  1445                 case 'C':

  1446                 case 'I': return " = 0;";

  1447                 case 'F':

  1448                 case 'D': return " = 0.0;";

  1449                 default:

  1450                     throw new IllegalStateException(is);

  1451             }

  1452         }

  1453         return " = null;";

  1454     }

  1456     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1457         AnnotationParser ap = new AnnotationParser(true) {

  1458             int anno;

  1459             int cnt;

  1461             @Override

  1462             protected void visitAnnotationStart(String type) throws IOException {

  1463                 if (anno++ > 0) {

  1464                     out.append(",");

  1465                 }

  1466                 out.append('"').append(type).append("\" : {\n");

  1467                 cnt = 0;

  1468             }

  1470             @Override

  1471             protected void visitAnnotationEnd(String type) throws IOException {

  1472                 out.append("\n}\n");

  1473             }

  1475             @Override

  1476             protected void visitAttr(String type, String attr, String attrType, String value)

  1477             throws IOException {

  1478                 if (attr == null) {

  1479                     return;

  1480                 }

  1481                 if (cnt++ > 0) {

  1482                     out.append(",\n");

  1483                 }

  1484                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1485             }

  1486         };

  1487         ap.parse(data, cd);

  1488     }

  1490     private static void emit(final Appendable out,

  1491                              final String format,

  1492                              final CharSequence... params) throws IOException {

  1493         final int length = format.length();

  1495         int processed = 0;

  1496         int paramOffset = format.indexOf('@');

  1497         while ((paramOffset != -1) && (paramOffset < (length - 1))) {

  1498             final char paramChar = format.charAt(paramOffset + 1);

  1499             if ((paramChar >= '1') && (paramChar <= '9')) {

  1500                 final int paramIndex = paramChar - '0' - 1;

  1502                 out.append(format, processed, paramOffset);

  1503                 out.append(params[paramIndex]);

  1505                 ++paramOffset;

  1506                 processed = paramOffset + 1;

  1507             }

  1509             paramOffset = format.indexOf('@', paramOffset + 1);

  1510         }

  1512         out.append(format, processed, length);

  1513     }

  1515 }

author	Lubomir Nerad <lubomir.nerad@oracle.com>
	Wed, 12 Dec 2012 11:04:02 +0100
branch	registers
changeset 307	eaf4e8387065
parent 283	51043a802035
child 317	15cbc8cb2163
permissions	-rw-r--r--