hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@e4fb6c7ac42a

     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.*;

    28 import org.apidesign.javap.TrapData;

    29 import org.apidesign.javap.TrapDataIterator;

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

    32  *

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

    34  */

    35 abstract class ByteCodeToJavaScript {

    36     private ClassData jc;

    37     final Appendable out;

    39     protected ByteCodeToJavaScript(Appendable out) {

    40         this.out = out;

    41     }

    43     /* Collects additional required resources.

    44      *

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

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

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

    48      */

    49     protected abstract boolean requireReference(String internalClassName);

    51     /*

    52      * @param resourcePath name of resources to read

    53      */

    54     protected abstract void requireScript(String resourcePath);

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

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

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

    59      *

    60      * @param className suggested name of the class

    61      */

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

    63         return className + " = ";

    64     }

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

    66         return classOperation;

    67     }

    69     /** Prints out a debug message.

    70      *

    71      * @param msg the message

    72      * @return true if the message has been printed

    73      * @throws IOException

    74      */

    75     boolean debug(String msg) throws IOException {

    76         out.append(msg);

    77         return true;

    78     }

    80     /**

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

    82      *

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

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

    85      *

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

    87      */

    89     public String compile(InputStream classFile) throws IOException {

    90         this.jc = new ClassData(classFile);

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

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

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

    94             );

    95         }

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

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

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

    99             "resource", "processByteCode"

   100         );

   101         if (arr != null) {

   102             requireScript(arr[0]);

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

   104                 return null;

   105             }

   106         }

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

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

   109             "container", "prototype"

   110         );

   111         StringArray toInitilize = new StringArray();

   112         final String className = className(jc);

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

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

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

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

   117             if (v.isStatic()) {

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

   119             }

   120         }

   121         if (proto == null) {

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

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

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

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

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

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

   128         } else {

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

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

   131                 proto[0] = "p";

   132             }

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

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

   135         }

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

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

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

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

   140                 "name", "value"

   141             );

   142             if (only != null) {

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

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

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

   146                 }

   147                 continue;

   148             }

   149             String prefix;

   150             String mn;

   151             if (m.isStatic()) {

   152                 prefix = "\n    c.";

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

   154             } else {

   155                 if (m.isConstructor()) {

   156                     prefix = "\n    CLS.";

   157                     mn = generateInstanceMethod(prefix, m);

   158                 } else {

   159                     prefix = "\n    c.";

   160                     mn = generateInstanceMethod(prefix, m);

   161                 }

   162             }

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

   164             if (runAnno != null) {

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

   166                 generateAnno(jc, out, runAnno);

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

   168             }

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

   170         }

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

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

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

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

   175         }

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

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

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

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

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

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

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

   183         if (classAnno != null) {

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

   185             generateAnno(jc, out, classAnno);

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

   187         }

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

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

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

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

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

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

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

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

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

   197                 "name", "value"

   198             );

   199             if (only != null) {

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

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

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

   203                 }

   204                 continue;

   205             }

   206             if (!v.isStatic()) {

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

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

   209             }

   210         }

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

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

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

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

   215         StringBuilder sb = new StringBuilder();

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

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

   218         }

   219         return sb.toString();

   220     }

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

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

   223         if (jsb != null) {

   224             return jsb;

   225         }

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

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

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

   229         }

   230         generateMethod(prefix, mn, m);

   231         return mn;

   232     }

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

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

   236         if (jsb != null) {

   237             return jsb;

   238         }

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

   240         generateMethod(prefix, mn, m);

   241         return mn;

   242     }

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

   245             throws IOException {

   246         final StackMapIterator stackMapIterator = m.createStackMapIterator();

   247         TrapDataIterator trap = m.getTrapDataIterator();

   248         final LocalsMapper lmapper =

   249                 new LocalsMapper(stackMapIterator.getArguments());

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

   252         lmapper.outputArguments(out);

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

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

   256         if (byteCodes == null) {

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

   258                .append(jc.getClassName()).append('.')

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

   260             out.append("};");

   261             return;

   262         }

   264         final StackMapper smapper = new StackMapper();

   266         final int maxLocals = m.getMaxLocals();

   267         if (maxLocals > 0) {

   268             // TODO: generate only used local variables

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

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

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

   272                     out.append(", ");

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

   274                 }

   275                 out.append(';');

   276             }

   277         }

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

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

   281         final int maxStack = m.getMaxStack();

   282         if (maxStack > 0) {

   283             // TODO: generate only used stack variables

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

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

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

   287                     out.append(", ");

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

   289                 }

   290                 out.append(';');

   291             }

   292         }

   294         int lastStackFrame = -1;

   295         TrapData[] previousTrap = null;

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

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

   299             int prev = i;

   300             stackMapIterator.advanceTo(i);

   301             boolean changeInCatch = trap.advanceTo(i);

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

   303                 if (previousTrap != null) {

   304                     generateCatch(previousTrap);

   305                     previousTrap = null;

   306                 }

   307             }

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

   309                 lastStackFrame = stackMapIterator.getFrameIndex();

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

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

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

   313                 changeInCatch = true;

   314             } else {

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

   316             }

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

   318                 out.append("try {");

   319                 previousTrap = trap.current();

   320             }

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

   322             switch (c) {

   323                 case opc_aload_0:

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

   325                     break;

   326                 case opc_iload_0:

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

   328                     break;

   329                 case opc_lload_0:

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

   331                     break;

   332                 case opc_fload_0:

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

   334                     break;

   335                 case opc_dload_0:

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

   337                     break;

   338                 case opc_aload_1:

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

   340                     break;

   341                 case opc_iload_1:

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

   343                     break;

   344                 case opc_lload_1:

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

   346                     break;

   347                 case opc_fload_1:

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

   349                     break;

   350                 case opc_dload_1:

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

   352                     break;

   353                 case opc_aload_2:

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

   355                     break;

   356                 case opc_iload_2:

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

   358                     break;

   359                 case opc_lload_2:

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

   361                     break;

   362                 case opc_fload_2:

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

   364                     break;

   365                 case opc_dload_2:

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

   367                     break;

   368                 case opc_aload_3:

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

   370                     break;

   371                 case opc_iload_3:

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

   373                     break;

   374                 case opc_lload_3:

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

   376                     break;

   377                 case opc_fload_3:

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

   379                     break;

   380                 case opc_dload_3:

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

   382                     break;

   383                 case opc_iload: {

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

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

   386                     break;

   387                 }

   388                 case opc_lload: {

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

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

   391                     break;

   392                 }

   393                 case opc_fload: {

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

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

   396                     break;

   397                 }

   398                 case opc_dload: {

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

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

   401                     break;

   402                 }

   403                 case opc_aload: {

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

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

   406                     break;

   407                 }

   408                 case opc_istore: {

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

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

   411                     break;

   412                 }

   413                 case opc_lstore: {

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

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

   416                     break;

   417                 }

   418                 case opc_fstore: {

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

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

   421                     break;

   422                 }

   423                 case opc_dstore: {

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

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

   426                     break;

   427                 }

   428                 case opc_astore: {

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

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

   431                     break;

   432                 }

   433                 case opc_astore_0:

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

   435                     break;

   436                 case opc_istore_0:

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

   438                     break;

   439                 case opc_lstore_0:

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

   441                     break;

   442                 case opc_fstore_0:

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

   444                     break;

   445                 case opc_dstore_0:

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

   447                     break;

   448                 case opc_astore_1:

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

   450                     break;

   451                 case opc_istore_1:

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

   453                     break;

   454                 case opc_lstore_1:

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

   456                     break;

   457                 case opc_fstore_1:

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

   459                     break;

   460                 case opc_dstore_1:

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

   462                     break;

   463                 case opc_astore_2:

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

   465                     break;

   466                 case opc_istore_2:

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

   468                     break;

   469                 case opc_lstore_2:

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

   471                     break;

   472                 case opc_fstore_2:

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

   474                     break;

   475                 case opc_dstore_2:

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

   477                     break;

   478                 case opc_astore_3:

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

   480                     break;

   481                 case opc_istore_3:

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

   483                     break;

   484                 case opc_lstore_3:

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

   486                     break;

   487                 case opc_fstore_3:

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

   489                     break;

   490                 case opc_dstore_3:

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

   492                     break;

   493                 case opc_iadd:

   494                     emit(out, "@1 = __add32(@1,@2);", smapper.getI(1), smapper.popI());

   495                     break;

   496                 case opc_ladd:

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

   498                     break;

   499                 case opc_fadd:

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

   501                     break;

   502                 case opc_dadd:

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

   504                     break;

   505                 case opc_isub:

   506                     emit(out, "@1 = __sub32(@1,@2);", smapper.getI(1), smapper.popI());

   507                     break;

   508                 case opc_lsub:

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

   510                     break;

   511                 case opc_fsub:

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

   513                     break;

   514                 case opc_dsub:

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

   516                     break;

   517                 case opc_imul:

   518                     emit(out, "@1 = __mul32(@1,@2);", smapper.getI(1), smapper.popI());

   519                     break;

   520                 case opc_lmul:

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

   522                     break;

   523                 case opc_fmul:

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

   525                     break;

   526                 case opc_dmul:

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

   528                     break;

   529                 case opc_idiv:

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

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

   532                     break;

   533                 case opc_ldiv:

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

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

   536                     break;

   537                 case opc_fdiv:

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

   539                     break;

   540                 case opc_ddiv:

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

   542                     break;

   543                 case opc_irem:

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

   545                     break;

   546                 case opc_lrem:

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

   548                     break;

   549                 case opc_frem:

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

   551                     break;

   552                 case opc_drem:

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

   554                     break;

   555                 case opc_iand:

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

   557                     break;

   558                 case opc_land:

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

   560                     break;

   561                 case opc_ior:

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

   563                     break;

   564                 case opc_lor:

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

   566                     break;

   567                 case opc_ixor:

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

   569                     break;

   570                 case opc_lxor:

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

   572                     break;

   573                 case opc_ineg:

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

   575                     break;

   576                 case opc_lneg:

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

   578                     break;

   579                 case opc_fneg:

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

   581                     break;

   582                 case opc_dneg:

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

   584                     break;

   585                 case opc_ishl:

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

   587                     break;

   588                 case opc_lshl:

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

   590                     break;

   591                 case opc_ishr:

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

   593                     break;

   594                 case opc_lshr:

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

   596                     break;

   597                 case opc_iushr:

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

   599                     break;

   600                 case opc_lushr:

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

   602                     break;

   603                 case opc_iinc: {

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

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

   606                     if (incrBy == 1) {

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

   608                     } else {

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

   610                              lmapper.getI(varIndx),

   611                              Integer.toString(incrBy));

   612                     }

   613                     break;

   614                 }

   615                 case opc_return:

   616                     emit(out, "return;");

   617                     break;

   618                 case opc_ireturn:

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

   620                     break;

   621                 case opc_lreturn:

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

   623                     break;

   624                 case opc_freturn:

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

   626                     break;

   627                 case opc_dreturn:

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

   629                     break;

   630                 case opc_areturn:

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

   632                     break;

   633                 case opc_i2l:

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

   635                     break;

   636                 case opc_i2f:

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

   638                     break;

   639                 case opc_i2d:

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

   641                     break;

   642                 case opc_l2i:

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

   644                     break;

   645                     // max int check?

   646                 case opc_l2f:

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

   648                     break;

   649                 case opc_l2d:

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

   651                     break;

   652                 case opc_f2d:

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

   654                     break;

   655                 case opc_d2f:

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

   657                     break;

   658                 case opc_f2i:

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

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

   661                     break;

   662                 case opc_f2l:

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

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

   665                     break;

   666                 case opc_d2i:

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

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

   669                     break;

   670                 case opc_d2l:

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

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

   673                     break;

   674                 case opc_i2b:

   675                 case opc_i2c:

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

   677                     break;

   678                 case opc_i2s:

   679                     emit(out, "@1 = __toInt16(@1);", smapper.getI(0));

   680                     break;

   681                 case opc_aconst_null:

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

   683                     break;

   684                 case opc_iconst_m1:

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

   686                     break;

   687                 case opc_iconst_0:

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

   689                     break;

   690                 case opc_dconst_0:

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

   692                     break;

   693                 case opc_lconst_0:

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

   695                     break;

   696                 case opc_fconst_0:

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

   698                     break;

   699                 case opc_iconst_1:

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

   701                     break;

   702                 case opc_lconst_1:

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

   704                     break;

   705                 case opc_fconst_1:

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

   707                     break;

   708                 case opc_dconst_1:

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

   710                     break;

   711                 case opc_iconst_2:

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

   713                     break;

   714                 case opc_fconst_2:

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

   716                     break;

   717                 case opc_iconst_3:

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

   719                     break;

   720                 case opc_iconst_4:

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

   722                     break;

   723                 case opc_iconst_5:

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

   725                     break;

   726                 case opc_ldc: {

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

   728                     String v = encodeConstant(indx);

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

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

   731                     break;

   732                 }

   733                 case opc_ldc_w:

   734                 case opc_ldc2_w: {

   735                     int indx = readIntArg(byteCodes, i);

   736                     i += 2;

   737                     String v = encodeConstant(indx);

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

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

   740                     break;

   741                 }

   742                 case opc_lcmp:

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

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

   745                     break;

   746                 case opc_fcmpl:

   747                 case opc_fcmpg:

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

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

   750                     break;

   751                 case opc_dcmpl:

   752                 case opc_dcmpg:

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

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

   755                     break;

   756                 case opc_if_acmpeq:

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

   758                                    "===");

   759                     break;

   760                 case opc_if_acmpne:

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

   762                                    "!=");

   763                     break;

   764                 case opc_if_icmpeq:

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

   766                                    "==");

   767                     break;

   768                 case opc_ifeq: {

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

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

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

   772                     i += 2;

   773                     break;

   774                 }

   775                 case opc_ifne: {

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

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

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

   779                     i += 2;

   780                     break;

   781                 }

   782                 case opc_iflt: {

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

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

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

   786                     i += 2;

   787                     break;

   788                 }

   789                 case opc_ifle: {

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

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

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

   793                     i += 2;

   794                     break;

   795                 }

   796                 case opc_ifgt: {

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

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

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

   800                     i += 2;

   801                     break;

   802                 }

   803                 case opc_ifge: {

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

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

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

   807                     i += 2;

   808                     break;

   809                 }

   810                 case opc_ifnonnull: {

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

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

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

   814                     i += 2;

   815                     break;

   816                 }

   817                 case opc_ifnull: {

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

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

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

   821                     i += 2;

   822                     break;

   823                 }

   824                 case opc_if_icmpne:

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

   826                                    "!=");

   827                     break;

   828                 case opc_if_icmplt:

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

   830                                    "<");

   831                     break;

   832                 case opc_if_icmple:

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

   834                                    "<=");

   835                     break;

   836                 case opc_if_icmpgt:

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

   838                                    ">");

   839                     break;

   840                 case opc_if_icmpge:

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

   842                                    ">=");

   843                     break;

   844                 case opc_goto: {

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

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

   847                     i += 2;

   848                     break;

   849                 }

   850                 case opc_lookupswitch: {

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

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

   853                     table += 4;

   854                     int n = readInt4(byteCodes, table);

   855                     table += 4;

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

   857                     while (n-- > 0) {

   858                         int cnstnt = readInt4(byteCodes, table);

   859                         table += 4;

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

   861                         table += 4;

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

   863                     }

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

   865                     i = table - 1;

   866                     break;

   867                 }

   868                 case opc_tableswitch: {

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

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

   871                     table += 4;

   872                     int low = readInt4(byteCodes, table);

   873                     table += 4;

   874                     int high = readInt4(byteCodes, table);

   875                     table += 4;

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

   877                     while (low <= high) {

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

   879                         table += 4;

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

   881                         low++;

   882                     }

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

   884                     i = table - 1;

   885                     break;

   886                 }

   887                 case opc_invokeinterface: {

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

   889                     break;

   890                 }

   891                 case opc_invokevirtual:

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

   893                     break;

   894                 case opc_invokespecial:

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

   896                     break;

   897                 case opc_invokestatic:

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

   899                     break;

   900                 case opc_new: {

   901                     int indx = readIntArg(byteCodes, i);

   902                     String ci = jc.getClassName(indx);

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

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

   905                     addReference(ci);

   906                     i += 2;

   907                     break;

   908                 }

   909                 case opc_newarray:

   910                     ++i; // skip type of array

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

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

   913                     break;

   914                 case opc_anewarray:

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

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

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

   918                     break;

   919                 case opc_multianewarray: {

   920                     i += 2;

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

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

   923                        .append(").fillNulls();");

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

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

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

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

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

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

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

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

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

   933                             append(";");

   934                     }

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

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

   937                     }

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

   939                     break;

   940                 }

   941                 case opc_arraylength:

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

   943                     break;

   944                 case opc_lastore:

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

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

   947                     break;

   948                 case opc_fastore:

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

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

   951                     break;

   952                 case opc_dastore:

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

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

   955                     break;

   956                 case opc_aastore:

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

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

   959                     break;

   960                 case opc_iastore:

   961                 case opc_bastore:

   962                 case opc_castore:

   963                 case opc_sastore:

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

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

   966                     break;

   967                 case opc_laload:

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

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

   970                     break;

   971                 case opc_faload:

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

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

   974                     break;

   975                 case opc_daload:

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

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

   978                     break;

   979                 case opc_aaload:

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

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

   982                     break;

   983                 case opc_iaload:

   984                 case opc_baload:

   985                 case opc_caload:

   986                 case opc_saload:

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

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

   989                     break;

   990                 case opc_pop:

   991                 case opc_pop2:

   992                     smapper.pop(1);

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

   994                     break;

   995                 case opc_dup: {

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

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

   998                     break;

   999                 }

  1000                 case opc_dup2: {

  1001                     if (smapper.get(0).isCategory2()) {

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

  1003                         emit(out, "@1 = @2;", smapper.pushT(v.getType()), v);

  1004                     } else {

  1005                         final Variable v1 = smapper.get(0);

  1006                         final Variable v2 = smapper.get(1);

  1007                         emit(out, "{ @1 = @2; @3 = @4; }",

  1008                              smapper.pushT(v2.getType()), v2,

  1009                              smapper.pushT(v1.getType()), v1);

  1010                     }

  1011                     break;

  1012                 }

  1013                 case opc_dup_x1: {

  1014                     final Variable vi1 = smapper.pop();

  1015                     final Variable vi2 = smapper.pop();

  1016                     final Variable vo3 = smapper.pushT(vi1.getType());

  1017                     final Variable vo2 = smapper.pushT(vi2.getType());

  1018                     final Variable vo1 = smapper.pushT(vi1.getType());

  1020                     emit(out, "{ @1 = @2; @3 = @4; @5 = @6; }",

  1021                          vo1, vi1, vo2, vi2, vo3, vo1);

  1022                     break;

  1023                 }

  1024                 case opc_dup_x2: {

  1025                     if (smapper.get(1).isCategory2()) {

  1026                         final Variable vi1 = smapper.pop();

  1027                         final Variable vi2 = smapper.pop();

  1028                         final Variable vo3 = smapper.pushT(vi1.getType());

  1029                         final Variable vo2 = smapper.pushT(vi2.getType());

  1030                         final Variable vo1 = smapper.pushT(vi1.getType());

  1032                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; }",

  1033                              vo1, vi1, vo2, vi2, vo3, vo1);

  1034                     } else {

  1035                         final Variable vi1 = smapper.pop();

  1036                         final Variable vi2 = smapper.pop();

  1037                         final Variable vi3 = smapper.pop();

  1038                         final Variable vo4 = smapper.pushT(vi1.getType());

  1039                         final Variable vo3 = smapper.pushT(vi3.getType());

  1040                         final Variable vo2 = smapper.pushT(vi2.getType());

  1041                         final Variable vo1 = smapper.pushT(vi1.getType());

  1043                         emit(out, "{ @1 = @2; @3 = @4; @5 = @6; @7 = @8; }",

  1044                              vo1, vi1, vo2, vi2, vo3, vi3, vo4, vo1);

  1045                     }

  1046                     break;

  1047                 }

  1048                 case opc_bipush:

  1049                     emit(out, "@1 = @2;",

  1050                          smapper.pushI(), Integer.toString(byteCodes[++i]));

  1051                     break;

  1052                 case opc_sipush:

  1053                     emit(out, "@1 = @2;",

  1054                          smapper.pushI(),

  1055                          Integer.toString(readIntArg(byteCodes, i)));

  1056                     i += 2;

  1057                     break;

  1058                 case opc_getfield: {

  1059                     int indx = readIntArg(byteCodes, i);

  1060                     String[] fi = jc.getFieldInfoName(indx);

  1061                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1062                     emit(out, "@2 = @1.fld_@3;",

  1063                          smapper.popA(), smapper.pushT(type), fi[1]);

  1064                     i += 2;

  1065                     break;

  1066                 }

  1067                 case opc_getstatic: {

  1068                     int indx = readIntArg(byteCodes, i);

  1069                     String[] fi = jc.getFieldInfoName(indx);

  1070                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1071                     emit(out, "@1 = @2(false).constructor.@3;",

  1072                          smapper.pushT(type),

  1073                          accessClass(fi[0].replace('/', '_')), fi[1]);

  1074                     i += 2;

  1075                     addReference(fi[0]);

  1076                     break;

  1077                 }

  1078                 case opc_putfield: {

  1079                     int indx = readIntArg(byteCodes, i);

  1080                     String[] fi = jc.getFieldInfoName(indx);

  1081                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1082                     emit(out, "@2.fld_@3 = @1;",

  1083                          smapper.popT(type), smapper.popA(), fi[1]);

  1084                     i += 2;

  1085                     break;

  1086                 }

  1087                 case opc_putstatic: {

  1088                     int indx = readIntArg(byteCodes, i);

  1089                     String[] fi = jc.getFieldInfoName(indx);

  1090                     final int type = VarType.fromFieldType(fi[2].charAt(0));

  1091                     emit(out, "@1(false).constructor.@2 = @3;",

  1092                          accessClass(fi[0].replace('/', '_')), fi[1],

  1093                          smapper.popT(type));

  1094                     i += 2;

  1095                     addReference(fi[0]);

  1096                     break;

  1097                 }

  1098                 case opc_checkcast: {

  1099                     int indx = readIntArg(byteCodes, i);

  1100                     final String type = jc.getClassName(indx);

  1101                     if (!type.startsWith("[")) {

  1102                         // no way to check arrays right now

  1103                         // XXX proper exception

  1104                         emit(out,

  1105                              "if (@1 !== null && !@1.$instOf_@2) throw {};",

  1106                              smapper.getA(0), type.replace('/', '_'));

  1107                     }

  1108                     i += 2;

  1109                     break;

  1110                 }

  1111                 case opc_instanceof: {

  1112                     int indx = readIntArg(byteCodes, i);

  1113                     final String type = jc.getClassName(indx);

  1114                     emit(out, "@2 = @1.$instOf_@3 ? 1 : 0;",

  1115                          smapper.popA(), smapper.pushI(),

  1116                          type.replace('/', '_'));

  1117                     i += 2;

  1118                     break;

  1119                 }

  1120                 case opc_athrow: {

  1121                     final Variable v = smapper.popA();

  1122                     smapper.clear();

  1124                     emit(out, "{ @1 = @2; throw @2; }",

  1125                          smapper.pushA(), v);

  1126                     break;

  1127                 }

  1129                 case opc_monitorenter: {

  1130                     out.append("/* monitor enter */");

  1131                     smapper.popA();

  1132                     break;

  1133                 }

  1135                 case opc_monitorexit: {

  1136                     out.append("/* monitor exit */");

  1137                     smapper.popA();

  1138                     break;

  1139                 }

  1141                 default: {

  1142                     emit(out, "throw 'unknown bytecode @1';",

  1143                          Integer.toString(c));

  1144                 }

  1145             }

  1146             if (debug(" //")) {

  1147                 for (int j = prev; j <= i; j++) {

  1148                     out.append(" ");

  1149                     final int cc = readByte(byteCodes, j);

  1150                     out.append(Integer.toString(cc));

  1151                 }

  1152             }

  1153             out.append("\n");

  1154         }

  1155         if (previousTrap != null) {

  1156             generateCatch(previousTrap);

  1157         }

  1158         out.append("  }\n");

  1159         out.append("};");

  1160     }

  1162     private int generateIf(byte[] byteCodes, int i,

  1163                            final Variable v2, final Variable v1,

  1164                            final String test) throws IOException {

  1165         int indx = i + readIntArg(byteCodes, i);

  1166         out.append("if (").append(v1)

  1167            .append(' ').append(test).append(' ')

  1168            .append(v2).append(") { gt = " + indx)

  1169            .append("; continue; }");

  1170         return i + 2;

  1171     }

  1173     private int readIntArg(byte[] byteCodes, int offsetInstruction) {

  1174         final int indxHi = byteCodes[offsetInstruction + 1] << 8;

  1175         final int indxLo = byteCodes[offsetInstruction + 2];

  1176         return (indxHi & 0xffffff00) | (indxLo & 0xff);

  1177     }

  1178     private int readInt4(byte[] byteCodes, int offsetInstruction) {

  1179         final int d = byteCodes[offsetInstruction + 0] << 24;

  1180         final int c = byteCodes[offsetInstruction + 1] << 16;

  1181         final int b = byteCodes[offsetInstruction + 2] << 8;

  1182         final int a = byteCodes[offsetInstruction + 3];

  1183         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

  1184     }

  1185     private int readByte(byte[] byteCodes, int offsetInstruction) {

  1186         return byteCodes[offsetInstruction] & 0xff;

  1187     }

  1189     private static void countArgs(String descriptor, char[] returnType, StringBuilder sig, StringBuilder cnt) {

  1190         int i = 0;

  1191         Boolean count = null;

  1192         boolean array = false;

  1193         sig.append("__");

  1194         int firstPos = sig.length();

  1195         while (i < descriptor.length()) {

  1196             char ch = descriptor.charAt(i++);

  1197             switch (ch) {

  1198                 case '(':

  1199                     count = true;

  1200                     continue;

  1201                 case ')':

  1202                     count = false;

  1203                     continue;

  1204                 case 'B':

  1205                 case 'C':

  1206                 case 'D':

  1207                 case 'F':

  1208                 case 'I':

  1209                 case 'J':

  1210                 case 'S':

  1211                 case 'Z':

  1212                     if (count) {

  1213                         if (array) {

  1214                             sig.append("_3");

  1215                         }

  1216                         sig.append(ch);

  1217                         if (ch == 'J' || ch == 'D') {

  1218                             cnt.append('1');

  1219                         } else {

  1220                             cnt.append('0');

  1221                         }

  1222                     } else {

  1223                         sig.insert(firstPos, ch);

  1224                         if (array) {

  1225                             returnType[0] = '[';

  1226                             sig.insert(firstPos, "_3");

  1227                         } else {

  1228                             returnType[0] = ch;

  1229                         }

  1230                     }

  1231                     array = false;

  1232                     continue;

  1233                 case 'V':

  1234                     assert !count;

  1235                     returnType[0] = 'V';

  1236                     sig.insert(firstPos, 'V');

  1237                     continue;

  1238                 case 'L':

  1239                     int next = descriptor.indexOf(';', i);

  1240                     String realSig = mangleSig(descriptor, i - 1, next + 1);

  1241                     if (count) {

  1242                         if (array) {

  1243                             sig.append("_3");

  1244                         }

  1245                         sig.append(realSig);

  1246                         cnt.append('0');

  1247                     } else {

  1248                         sig.insert(firstPos, realSig);

  1249                         if (array) {

  1250                             sig.insert(firstPos, "_3");

  1251                         }

  1252                         returnType[0] = 'L';

  1253                     }

  1254                     i = next + 1;

  1255                     array = false;

  1256                     continue;

  1257                 case '[':

  1258                     array = true;

  1259                     continue;

  1260                 default:

  1261                     throw new IllegalStateException("Invalid char: " + ch);

  1262             }

  1263         }

  1264     }

  1266     private static String mangleSig(String txt, int first, int last) {

  1267         StringBuilder sb = new StringBuilder();

  1268         for (int i = first; i < last; i++) {

  1269             final char ch = txt.charAt(i);

  1270             switch (ch) {

  1271                 case '/': sb.append('_'); break;

  1272                 case '_': sb.append("_1"); break;

  1273                 case ';': sb.append("_2"); break;

  1274                 case '[': sb.append("_3"); break;

  1275                 default: sb.append(ch); break;

  1276             }

  1277         }

  1278         return sb.toString();

  1279     }

  1281     private static String findMethodName(MethodData m, StringBuilder cnt) {

  1282         StringBuilder name = new StringBuilder();

  1283         if ("<init>".equals(m.getName())) { // NOI18N

  1284             name.append("cons"); // NOI18N

  1285         } else if ("<clinit>".equals(m.getName())) { // NOI18N

  1286             name.append("class"); // NOI18N

  1287         } else {

  1288             name.append(m.getName());

  1289         }

  1291         countArgs(m.getInternalSig(), new char[1], name, cnt);

  1292         return name.toString();

  1293     }

  1295     static String findMethodName(String[] mi, StringBuilder cnt, char[] returnType) {

  1296         StringBuilder name = new StringBuilder();

  1297         String descr = mi[2];//mi.getDescriptor();

  1298         String nm= mi[1];

  1299         if ("<init>".equals(nm)) { // NOI18N

  1300             name.append("cons"); // NOI18N

  1301         } else {

  1302             name.append(nm);

  1303         }

  1304         countArgs(descr, returnType, name, cnt);

  1305         return name.toString();

  1306     }

  1308     private int invokeStaticMethod(byte[] byteCodes, int i, final StackMapper mapper, boolean isStatic)

  1309     throws IOException {

  1310         int methodIndex = readIntArg(byteCodes, i);

  1311         String[] mi = jc.getFieldInfoName(methodIndex);

  1312         char[] returnType = { 'V' };

  1313         StringBuilder cnt = new StringBuilder();

  1314         String mn = findMethodName(mi, cnt, returnType);

  1316         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1317         final Variable[] vars = new Variable[numArguments];

  1319         for (int j = numArguments - 1; j >= 0; --j) {

  1320             vars[j] = mapper.pop();

  1321         }

  1323         if (returnType[0] != 'V') {

  1324             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1325                .append(" = ");

  1326         }

  1328         final String in = mi[0];

  1329         out.append(accessClass(in.replace('/', '_')));

  1330         out.append("(false).");

  1331         if (mn.startsWith("cons_")) {

  1332             out.append("constructor.");

  1333         }

  1334         out.append(mn);

  1335         out.append('(');

  1336         if (numArguments > 0) {

  1337             out.append(vars[0]);

  1338             for (int j = 1; j < numArguments; ++j) {

  1339                 out.append(", ");

  1340                 out.append(vars[j]);

  1341             }

  1342         }

  1343         out.append(");");

  1344         i += 2;

  1345         addReference(in);

  1346         return i;

  1347     }

  1348     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackMapper mapper)

  1349     throws IOException {

  1350         int methodIndex = readIntArg(byteCodes, i);

  1351         String[] mi = jc.getFieldInfoName(methodIndex);

  1352         char[] returnType = { 'V' };

  1353         StringBuilder cnt = new StringBuilder();

  1354         String mn = findMethodName(mi, cnt, returnType);

  1356         final int numArguments = cnt.length() + 1;

  1357         final Variable[] vars = new Variable[numArguments];

  1359         for (int j = numArguments - 1; j >= 0; --j) {

  1360             vars[j] = mapper.pop();

  1361         }

  1363         if (returnType[0] != 'V') {

  1364             out.append(mapper.pushT(VarType.fromFieldType(returnType[0])))

  1365                .append(" = ");

  1366         }

  1368         out.append(vars[0]).append('.');

  1369         out.append(mn);

  1370         out.append('(');

  1371         out.append(vars[0]);

  1372         for (int j = 1; j < numArguments; ++j) {

  1373             out.append(", ");

  1374             out.append(vars[j]);

  1375         }

  1376         out.append(");");

  1377         i += 2;

  1378         return i;

  1379     }

  1381     private void addReference(String cn) throws IOException {

  1382         if (requireReference(cn)) {

  1383             debug(" /* needs " + cn + " */");

  1384         }

  1385     }

  1387     private void outType(String d, StringBuilder out) {

  1388         int arr = 0;

  1389         while (d.charAt(0) == '[') {

  1390             out.append('A');

  1391             d = d.substring(1);

  1392         }

  1393         if (d.charAt(0) == 'L') {

  1394             assert d.charAt(d.length() - 1) == ';';

  1395             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1396         } else {

  1397             out.append(d);

  1398         }

  1399     }

  1401     private String encodeConstant(int entryIndex) throws IOException {

  1402         String[] classRef = { null };

  1403         String s = jc.stringValue(entryIndex, classRef);

  1404         if (classRef[0] != null) {

  1405             addReference(classRef[0]);

  1406             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1407         }

  1408         return s;

  1409     }

  1411     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1412         byte[] arr = m.findAnnotationData(true);

  1413         if (arr == null) {

  1414             return null;

  1415         }

  1416         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1417         class P extends AnnotationParser {

  1418             public P() {

  1419                 super(false);

  1420             }

  1422             int cnt;

  1423             String[] args = new String[30];

  1424             String body;

  1426             @Override

  1427             protected void visitAttr(String type, String attr, String at, String value) {

  1428                 if (type.equals(jvmType)) {

  1429                     if ("body".equals(attr)) {

  1430                         body = value;

  1431                     } else if ("args".equals(attr)) {

  1432                         args[cnt++] = value;

  1433                     } else {

  1434                         throw new IllegalArgumentException(attr);

  1435                     }

  1436                 }

  1437             }

  1438         }

  1439         P p = new P();

  1440         p.parse(arr, jc);

  1441         if (p.body == null) {

  1442             return null;

  1443         }

  1444         StringBuilder cnt = new StringBuilder();

  1445         final String mn = findMethodName(m, cnt);

  1446         out.append(prefix).append(mn);

  1447         out.append(" = function(");

  1448         String space;

  1449         int index;

  1450         if (!isStatic) {

  1451             space = outputArg(out, p.args, 0);

  1452             index = 1;

  1453         } else {

  1454             space = "";

  1455             index = 0;

  1456         }

  1457         for (int i = 0; i < cnt.length(); i++) {

  1458             out.append(space);

  1459             space = outputArg(out, p.args, index);

  1460             index++;

  1461         }

  1462         out.append(") {").append("\n");

  1463         out.append(p.body);

  1464         out.append("\n}\n");

  1465         return mn;

  1466     }

  1467     private static String className(ClassData jc) {

  1468         //return jc.getName().getInternalName().replace('/', '_');

  1469         return jc.getClassName().replace('/', '_');

  1470     }

  1472     private static String[] findAnnotation(

  1473         byte[] arr, ClassData cd, final String className,

  1474         final String... attrNames

  1475     ) throws IOException {

  1476         if (arr == null) {

  1477             return null;

  1478         }

  1479         final String[] values = new String[attrNames.length];

  1480         final boolean[] found = { false };

  1481         final String jvmType = "L" + className.replace('.', '/') + ";";

  1482         AnnotationParser ap = new AnnotationParser(false) {

  1483             @Override

  1484             protected void visitAttr(String type, String attr, String at, String value) {

  1485                 if (type.equals(jvmType)) {

  1486                     found[0] = true;

  1487                     for (int i = 0; i < attrNames.length; i++) {

  1488                         if (attrNames[i].equals(attr)) {

  1489                             values[i] = value;

  1490                         }

  1491                     }

  1492                 }

  1493             }

  1495         };

  1496         ap.parse(arr, cd);

  1497         return found[0] ? values : null;

  1498     }

  1500     private CharSequence initField(FieldData v) {

  1501         final String is = v.getInternalSig();

  1502         if (is.length() == 1) {

  1503             switch (is.charAt(0)) {

  1504                 case 'S':

  1505                 case 'J':

  1506                 case 'B':

  1507                 case 'Z':

  1508                 case 'C':

  1509                 case 'I': return " = 0;";

  1510                 case 'F':

  1511                 case 'D': return " = 0.0;";

  1512                 default:

  1513                     throw new IllegalStateException(is);

  1514             }

  1515         }

  1516         return " = null;";

  1517     }

  1519     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1520         AnnotationParser ap = new AnnotationParser(true) {

  1521             int anno;

  1522             int cnt;

  1524             @Override

  1525             protected void visitAnnotationStart(String type) throws IOException {

  1526                 if (anno++ > 0) {

  1527                     out.append(",");

  1528                 }

  1529                 out.append('"').append(type).append("\" : {\n");

  1530                 cnt = 0;

  1531             }

  1533             @Override

  1534             protected void visitAnnotationEnd(String type) throws IOException {

  1535                 out.append("\n}\n");

  1536             }

  1538             @Override

  1539             protected void visitAttr(String type, String attr, String attrType, String value)

  1540             throws IOException {

  1541                 if (attr == null) {

  1542                     return;

  1543                 }

  1544                 if (cnt++ > 0) {

  1545                     out.append(",\n");

  1546                 }

  1547                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1548             }

  1549         };

  1550         ap.parse(data, cd);

  1551     }

  1553     private static String outputArg(Appendable out, String[] args, int indx) throws IOException {

  1554         final String name = args[indx];

  1555         if (name == null) {

  1556             return "";

  1557         }

  1558         if (name.contains(",")) {

  1559             throw new IOException("Wrong parameter with ',': " + name);

  1560         }

  1561         out.append(name);

  1562         return ",";

  1563     }

  1565     private static void emit(final Appendable out,

  1566                              final String format,

  1567                              final CharSequence... params) throws IOException {

  1568         final int length = format.length();

  1570         int processed = 0;

  1571         int paramOffset = format.indexOf('@');

  1572         while ((paramOffset != -1) && (paramOffset < (length - 1))) {

  1573             final char paramChar = format.charAt(paramOffset + 1);

  1574             if ((paramChar >= '1') && (paramChar <= '9')) {

  1575                 final int paramIndex = paramChar - '0' - 1;

  1577                 out.append(format, processed, paramOffset);

  1578                 out.append(params[paramIndex]);

  1580                 ++paramOffset;

  1581                 processed = paramOffset + 1;

  1582             }

  1584             paramOffset = format.indexOf('@', paramOffset + 1);

  1585         }

  1587         out.append(format, processed, length);

  1588     }

  1590     private void generateCatch(TrapData[] traps) throws IOException {

  1591         out.append("} catch (e) {\n");

  1592         int finallyPC = -1;

  1593         for (TrapData e : traps) {

  1594             if (e == null) {

  1595                 break;

  1596             }

  1597             if (e.catch_cpx != 0) { //not finally

  1598                 final String classInternalName = jc.getClassName(e.catch_cpx);

  1599                 addReference(classInternalName);

  1600                 if ("java/lang/Throwable".equals(classInternalName)) {

  1601                     out.append("if (e.$instOf_java_lang_Throwable) {");

  1602                     out.append("  stA0 = e;");

  1603                     out.append("} else {");

  1604                     out.append("  stA0 = vm.java_lang_Throwable(true);");

  1605                     out.append("  vm.java_lang_Throwable.cons__VLjava_lang_String_2(stA0, e.toString());");

  1606                     out.append("}");

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

  1608                 } else {

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

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

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

  1612                 }

  1613             } else {

  1614                 finallyPC = e.handler_pc;

  1615             }

  1616         }

  1617         if (finallyPC == -1) {

  1618             out.append("throw e;");

  1619         } else {

  1620             out.append("gt=" + finallyPC + "; stA0 = e; continue;");

  1621         }

  1622         out.append("\n}");

  1623     }

  1624 }

author	Martin Soch <Martin.Soch@oracle.com>
	Mon, 14 Jan 2013 09:17:18 +0100
branch	arithmetic
changeset 439	e4fb6c7ac42a
parent 438	7df624c2a0a1
child 440	aa50464da62d
permissions	-rw-r--r--