hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@36f16c49bdef

     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 static org.apidesign.javap.RuntimeConstants.*;

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

    29  *

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

    31  */

    32 public abstract class ByteCodeToJavaScript {

    33     private ClassData jc;

    34     private final Appendable out;

    36     protected ByteCodeToJavaScript(Appendable out) {

    37         this.out = out;

    38     }

    40     /* Collects additional required resources.

    41      *

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

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

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

    45      */

    46     protected abstract boolean requireReference(String internalClassName);

    48     /*

    49      * @param resourcePath name of resources to read

    50      */

    51     protected abstract void requireScript(String resourcePath);

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

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

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

    56      *

    57      * @param className suggested name of the class

    58      */

    59     protected String assignClass(String className) {

    60         return className + " = ";

    61     }

    63     /**

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

    65      *

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

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

    68      *

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

    70      */

    72     public String compile(InputStream classFile) throws IOException {

    73         this.jc = new ClassData(classFile);

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

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

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

    77             "resource", "processByteCode"

    78         );

    79         if (arr != null) {

    80             requireScript(arr[0]);

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

    82                 return null;

    83             }

    84         }

    85         StringArray toInitilize = new StringArray();

    86         final String className = className(jc);

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

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

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

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

    91             if (v.isStatic()) {

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

    93             }

    94         }

    95         // ClassName sc = jc.getSuperClass();

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

    97         if (sc != null) {

    98             out.append("\n    var p = CLS.prototype = ").

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

   100         } else {

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

   102         }

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

   104             if (m.isStatic()) {

   105                 generateStaticMethod("\n    p.", m, toInitilize);

   106             } else {

   107                 generateInstanceMethod("\n    p.", m);

   108             }

   109         }

   110         out.append("\n    p.constructor = CLS;");

   111         out.append("\n    p.$instOf_").append(className).append(" = true;");

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

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

   114         }

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

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

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

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

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

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

   121             if (!v.isStatic()) {

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

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

   124             }

   125         }

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

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

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

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

   130         StringBuilder sb = new StringBuilder();

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

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

   133         }

   134         return sb.toString();

   135     }

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

   137         if (javaScriptBody(prefix, m, true)) {

   138             return;

   139         }

   140         StringBuilder argsCnt = new StringBuilder();

   141         final String mn = findMethodName(m, argsCnt);

   142         out.append(prefix).append(mn).append(" = function");

   143         if (mn.equals("classV")) {

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

   145         }

   146         out.append('(');

   147         String space = "";

   148         for (int index = 0, i = 0; i < argsCnt.length(); i++) {

   149             out.append(space);

   150             out.append("arg").append(String.valueOf(index));

   151             space = ",";

   152             final String desc = null;// XXX findDescriptor(args.get(i).getDescriptor());

   153             if (argsCnt.charAt(i) == '1') {

   154                 index += 2;

   155             } else {

   156                 index++;

   157             }

   158         }

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

   160         final byte[] code = m.getCode();

   161         if (code != null) {

   162             int len = m.getMaxLocals();

   163             for (int index = argsCnt.length(), i = argsCnt.length(); i < len; i++) {

   164                 out.append("  var ");

   165                 out.append("arg").append(String.valueOf(i)).append(";\n");

   166             }

   167             out.append("  var s = new Array();\n");

   168             produceCode(code);

   169         } else {

   170             out.append("  throw 'no code found for ").append(m.getInternalSig()).append("';\n");

   171         }

   172         out.append("};");

   173     }

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

   176         if (javaScriptBody(prefix, m, false)) {

   177             return;

   178         }

   179         StringBuilder argsCnt = new StringBuilder();

   180         final String mn = findMethodName(m, argsCnt);

   181         out.append(prefix).append(mn).append(" = function");

   182         out.append("(arg0");

   183         String space = ",";

   184         for (int index = 1, i = 0; i < argsCnt.length(); i++) {

   185             out.append(space);

   186             out.append("arg").append(String.valueOf(index));

   187             if (argsCnt.charAt(i) == '1') {

   188                 index += 2;

   189             } else {

   190                 index++;

   191             }

   192         }

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

   194         final byte[] code = m.getCode();

   195         if (code != null) {

   196             int len = m.getMaxLocals();

   197             for (int index = argsCnt.length(), i = argsCnt.length(); i < len; i++) {

   198                 out.append("  var ");

   199                 out.append("arg").append(String.valueOf(i + 1)).append(";\n");

   200             }

   201             out.append(";\n  var s = new Array();\n");

   202             produceCode(code);

   203         } else {

   204             out.append("  throw 'no code found for ").append(m.getInternalSig()).append("';\n");

   205         }

   206         out.append("};");

   207     }

   209     private void produceCode(byte[] byteCodes) throws IOException {

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

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

   212             int prev = i;

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

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

   215             switch (c) {

   216                 case opc_aload_0:

   217                 case opc_iload_0:

   218                 case opc_lload_0:

   219                 case opc_fload_0:

   220                 case opc_dload_0:

   221                     out.append("s.push(arg0);");

   222                     break;

   223                 case opc_aload_1:

   224                 case opc_iload_1:

   225                 case opc_lload_1:

   226                 case opc_fload_1:

   227                 case opc_dload_1:

   228                     out.append("s.push(arg1);");

   229                     break;

   230                 case opc_aload_2:

   231                 case opc_iload_2:

   232                 case opc_lload_2:

   233                 case opc_fload_2:

   234                 case opc_dload_2:

   235                     out.append("s.push(arg2);");

   236                     break;

   237                 case opc_aload_3:

   238                 case opc_iload_3:

   239                 case opc_lload_3:

   240                 case opc_fload_3:

   241                 case opc_dload_3:

   242                     out.append("s.push(arg3);");

   243                     break;

   244                 case opc_iload:

   245                 case opc_lload:

   246                 case opc_fload:

   247                 case opc_dload:

   248                 case opc_aload: {

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

   250                     out.append("s.push(arg").append(indx + ");");

   251                     break;

   252                 }

   253                 case opc_istore:

   254                 case opc_lstore:

   255                 case opc_fstore:

   256                 case opc_dstore:

   257                 case opc_astore: {

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

   259                     out.append("arg" + indx).append(" = s.pop();");

   260                     break;

   261                 }

   262                 case opc_astore_0:

   263                 case opc_istore_0:

   264                 case opc_lstore_0:

   265                 case opc_fstore_0:

   266                 case opc_dstore_0:

   267                     out.append("arg0 = s.pop();");

   268                     break;

   269                 case opc_astore_1:

   270                 case opc_istore_1:

   271                 case opc_lstore_1:

   272                 case opc_fstore_1:

   273                 case opc_dstore_1:

   274                     out.append("arg1 = s.pop();");

   275                     break;

   276                 case opc_astore_2:

   277                 case opc_istore_2:

   278                 case opc_lstore_2:

   279                 case opc_fstore_2:

   280                 case opc_dstore_2:

   281                     out.append("arg2 = s.pop();");

   282                     break;

   283                 case opc_astore_3:

   284                 case opc_istore_3:

   285                 case opc_lstore_3:

   286                 case opc_fstore_3:

   287                 case opc_dstore_3:

   288                     out.append("arg3 = s.pop();");

   289                     break;

   290                 case opc_iadd:

   291                 case opc_ladd:

   292                 case opc_fadd:

   293                 case opc_dadd:

   294                     out.append("s.push(s.pop() + s.pop());");

   295                     break;

   296                 case opc_isub:

   297                 case opc_lsub:

   298                 case opc_fsub:

   299                 case opc_dsub:

   300                     out.append("{ var tmp = s.pop(); s.push(s.pop() - tmp); }");

   301                     break;

   302                 case opc_imul:

   303                 case opc_lmul:

   304                 case opc_fmul:

   305                 case opc_dmul:

   306                     out.append("s.push(s.pop() * s.pop());");

   307                     break;

   308                 case opc_idiv:

   309                 case opc_ldiv:

   310                     out.append("{ var tmp = s.pop(); s.push(Math.floor(s.pop() / tmp)); }");

   311                     break;

   312                 case opc_fdiv:

   313                 case opc_ddiv:

   314                     out.append("{ var tmp = s.pop(); s.push(s.pop() / tmp); }");

   315                     break;

   316                 case opc_irem:

   317                 case opc_lrem:

   318                 case opc_frem:

   319                 case opc_drem:

   320                     out.append("{ var d = s.pop(); s.push(s.pop() % d); }");

   321                     break;

   322                 case opc_iand:

   323                 case opc_land:

   324                     out.append("s.push(s.pop() & s.pop());");

   325                     break;

   326                 case opc_ior:

   327                 case opc_lor:

   328                     out.append("s.push(s.pop() | s.pop());");

   329                     break;

   330                 case opc_ixor:

   331                 case opc_lxor:

   332                     out.append("s.push(s.pop() ^ s.pop());");

   333                     break;

   334                 case opc_ineg:

   335                 case opc_lneg:

   336                 case opc_fneg:

   337                 case opc_dneg:

   338                     out.append("s.push(- s.pop());");

   339                     break;

   340                 case opc_ishl:

   341                 case opc_lshl:

   342                     out.append("{ var v = s.pop(); s.push(s.pop() << v); }");

   343                     break;

   344                 case opc_ishr:

   345                 case opc_lshr:

   346                     out.append("{ var v = s.pop(); s.push(s.pop() >> v); }");

   347                     break;

   348                 case opc_iushr:

   349                 case opc_lushr:

   350                     out.append("{ var v = s.pop(); s.push(s.pop() >>> v); }");

   351                     break;

   352                 case opc_iinc: {

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

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

   355                     if (incrBy == 1) {

   356                         out.append("arg" + varIndx).append("++;");

   357                     } else {

   358                         out.append("arg" + varIndx).append(" += " + incrBy).append(";");

   359                     }

   360                     break;

   361                 }

   362                 case opc_return:

   363                     out.append("return;");

   364                     break;

   365                 case opc_ireturn:

   366                 case opc_lreturn:

   367                 case opc_freturn:

   368                 case opc_dreturn:

   369                 case opc_areturn:

   370                     out.append("return s.pop();");

   371                     break;

   372                 case opc_i2l:

   373                 case opc_i2f:

   374                 case opc_i2d:

   375                 case opc_l2i:

   376                     // max int check?

   377                 case opc_l2f:

   378                 case opc_l2d:

   379                 case opc_f2d:

   380                 case opc_d2f:

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

   382                     break;

   383                 case opc_f2i:

   384                 case opc_f2l:

   385                 case opc_d2i:

   386                 case opc_d2l:

   387                     out.append("s.push(Math.floor(s.pop()));");

   388                     break;

   389                 case opc_i2b:

   390                 case opc_i2c:

   391                 case opc_i2s:

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

   393                     break;

   394                 case opc_aconst_null:

   395                     out.append("s.push(null);");

   396                     break;

   397                 case opc_iconst_m1:

   398                     out.append("s.push(-1);");

   399                     break;

   400                 case opc_iconst_0:

   401                 case opc_dconst_0:

   402                 case opc_lconst_0:

   403                 case opc_fconst_0:

   404                     out.append("s.push(0);");

   405                     break;

   406                 case opc_iconst_1:

   407                 case opc_lconst_1:

   408                 case opc_fconst_1:

   409                 case opc_dconst_1:

   410                     out.append("s.push(1);");

   411                     break;

   412                 case opc_iconst_2:

   413                 case opc_fconst_2:

   414                     out.append("s.push(2);");

   415                     break;

   416                 case opc_iconst_3:

   417                     out.append("s.push(3);");

   418                     break;

   419                 case opc_iconst_4:

   420                     out.append("s.push(4);");

   421                     break;

   422                 case opc_iconst_5:

   423                     out.append("s.push(5);");

   424                     break;

   425                 case opc_ldc: {

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

   427                     String v = encodeConstant(indx);

   428                     out.append("s.push(").append(v).append(");");

   429                     break;

   430                 }

   431                 case opc_ldc_w:

   432                 case opc_ldc2_w: {

   433                     int indx = readIntArg(byteCodes, i);

   434                     i += 2;

   435                     String v = encodeConstant(indx);

   436                     out.append("s.push(").append(v).append(");");

   437                     break;

   438                 }

   439                 case opc_lcmp:

   440                 case opc_fcmpl:

   441                 case opc_fcmpg:

   442                 case opc_dcmpl:

   443                 case opc_dcmpg: {

   444                     out.append("{ var delta = s.pop() - s.pop(); s.push(delta < 0 ?-1 : (delta == 0 ? 0 : 1)); }");

   445                     break;

   446                 }

   447                 case opc_if_acmpeq:

   448                     i = generateIf(byteCodes, i, "===");

   449                     break;

   450                 case opc_if_acmpne:

   451                     i = generateIf(byteCodes, i, "!=");

   452                     break;

   453                 case opc_if_icmpeq: {

   454                     i = generateIf(byteCodes, i, "==");

   455                     break;

   456                 }

   457                 case opc_ifeq: {

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

   459                     out.append("if (s.pop() == 0) { gt = " + indx);

   460                     out.append("; continue; }");

   461                     i += 2;

   462                     break;

   463                 }

   464                 case opc_ifne: {

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

   466                     out.append("if (s.pop() != 0) { gt = " + indx);

   467                     out.append("; continue; }");

   468                     i += 2;

   469                     break;

   470                 }

   471                 case opc_iflt: {

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

   473                     out.append("if (s.pop() < 0) { gt = " + indx);

   474                     out.append("; continue; }");

   475                     i += 2;

   476                     break;

   477                 }

   478                 case opc_ifle: {

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

   480                     out.append("if (s.pop() <= 0) { gt = " + indx);

   481                     out.append("; continue; }");

   482                     i += 2;

   483                     break;

   484                 }

   485                 case opc_ifgt: {

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

   487                     out.append("if (s.pop() > 0) { gt = " + indx);

   488                     out.append("; continue; }");

   489                     i += 2;

   490                     break;

   491                 }

   492                 case opc_ifge: {

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

   494                     out.append("if (s.pop() >= 0) { gt = " + indx);

   495                     out.append("; continue; }");

   496                     i += 2;

   497                     break;

   498                 }

   499                 case opc_ifnonnull: {

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

   501                     out.append("if (s.pop() !== null) { gt = " + indx);

   502                     out.append("; continue; }");

   503                     i += 2;

   504                     break;

   505                 }

   506                 case opc_ifnull: {

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

   508                     out.append("if (s.pop() === null) { gt = " + indx);

   509                     out.append("; continue; }");

   510                     i += 2;

   511                     break;

   512                 }

   513                 case opc_if_icmpne:

   514                     i = generateIf(byteCodes, i, "!=");

   515                     break;

   516                 case opc_if_icmplt:

   517                     i = generateIf(byteCodes, i, ">");

   518                     break;

   519                 case opc_if_icmple:

   520                     i = generateIf(byteCodes, i, ">=");

   521                     break;

   522                 case opc_if_icmpgt:

   523                     i = generateIf(byteCodes, i, "<");

   524                     break;

   525                 case opc_if_icmpge:

   526                     i = generateIf(byteCodes, i, "<=");

   527                     break;

   528                 case opc_goto: {

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

   530                     out.append("gt = " + indx).append("; continue;");

   531                     i += 2;

   532                     break;

   533                 }

   534                 case opc_lookupswitch: {

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

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

   537                     table += 4;

   538                     int n = readInt4(byteCodes, table);

   539                     table += 4;

   540                     out.append("switch (s.pop()) {\n");

   541                     while (n-- > 0) {

   542                         int cnstnt = readInt4(byteCodes, table);

   543                         table += 4;

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

   545                         table += 4;

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

   547                     }

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

   549                     i = table - 1;

   550                     break;

   551                 }

   552                 case opc_tableswitch: {

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

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

   555                     table += 4;

   556                     int low = readInt4(byteCodes, table);

   557                     table += 4;

   558                     int high = readInt4(byteCodes, table);

   559                     table += 4;

   560                     out.append("switch (s.pop()) {\n");

   561                     while (low <= high) {

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

   563                         table += 4;

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

   565                         low++;

   566                     }

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

   568                     i = table - 1;

   569                     break;

   570                 }

   571                 case opc_invokeinterface: {

   572                     i = invokeVirtualMethod(byteCodes, i) + 2;

   573                     break;

   574                 }

   575                 case opc_invokevirtual:

   576                     i = invokeVirtualMethod(byteCodes, i);

   577                     break;

   578                 case opc_invokespecial:

   579                     i = invokeStaticMethod(byteCodes, i, false);

   580                     break;

   581                 case opc_invokestatic:

   582                     i = invokeStaticMethod(byteCodes, i, true);

   583                     break;

   584                 case opc_new: {

   585                     int indx = readIntArg(byteCodes, i);

   586                     String ci = jc.getClassName(indx);

   587                     out.append("s.push(new ");

   588                     out.append(ci.replace('/','_'));

   589                     out.append("());");

   590                     addReference(ci);

   591                     i += 2;

   592                     break;

   593                 }

   594                 case opc_newarray: {

   595                     int type = byteCodes[i++];

   596                     out.append("s.push(new Array(s.pop()).fillNulls());");

   597                     break;

   598                 }

   599                 case opc_anewarray: {

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

   601                     out.append("s.push(new Array(s.pop()).fillNulls());");

   602                     break;

   603                 }

   604                 case opc_multianewarray: {

   605                     i += 2;

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

   607                     out.append("{ var a0 = new Array(s.pop()).fillNulls();");

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

   609                         out.append("\n  var l" + d).append(" = s.pop();");

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

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

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

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

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

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

   616                             append(";");

   617                     }

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

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

   620                     }

   621                     out.append("\ns.push(a0); }");

   622                     break;

   623                 }

   624                 case opc_arraylength:

   625                     out.append("s.push(s.pop().length);");

   626                     break;

   627                 case opc_iastore:

   628                 case opc_lastore:

   629                 case opc_fastore:

   630                 case opc_dastore:

   631                 case opc_aastore:

   632                 case opc_bastore:

   633                 case opc_castore:

   634                 case opc_sastore: {

   635                     out.append("{ var value = s.pop(); var indx = s.pop(); s.pop()[indx] = value; }");

   636                     break;

   637                 }

   638                 case opc_iaload:

   639                 case opc_laload:

   640                 case opc_faload:

   641                 case opc_daload:

   642                 case opc_aaload:

   643                 case opc_baload:

   644                 case opc_caload:

   645                 case opc_saload: {

   646                     out.append("{ var indx = s.pop(); s.push(s.pop()[indx]); }");

   647                     break;

   648                 }

   649                 case opc_pop2:

   650                     out.append("s.pop();");

   651                 case opc_pop:

   652                     out.append("s.pop();");

   653                     break;

   654                 case opc_dup:

   655                     out.append("s.push(s[s.length - 1]);");

   656                     break;

   657                 case opc_dup_x1:

   658                     out.append("{ var v1 = s.pop(); var v2 = s.pop(); s.push(v1); s.push(v2); s.push(v1); }");

   659                     break;

   660                 case opc_dup_x2:

   661                     out.append("{ var v1 = s.pop(); var v2 = s.pop(); var v3 = s.pop(); s.push(v1); s.push(v3); s.push(v2); s.push(v1); }");

   662                     break;

   663                 case opc_bipush:

   664                     out.append("s.push(" + byteCodes[++i] + ");");

   665                     break;

   666                 case opc_sipush:

   667                     out.append("s.push(" + readIntArg(byteCodes, i) + ");");

   668                     i += 2;

   669                     break;

   670                 case opc_getfield: {

   671                     int indx = readIntArg(byteCodes, i);

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

   673                     out.append("s.push(s.pop().fld_").

   674                         append(fi[1]).append(");");

   675                     i += 2;

   676                     break;

   677                 }

   678                 case opc_getstatic: {

   679                     int indx = readIntArg(byteCodes, i);

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

   681                     out.append("s.push(").append(fi[0].replace('/', '_'));

   682                     out.append('.').append(fi[1]).append(");");

   683                     i += 2;

   684                     addReference(fi[0]);

   685                     break;

   686                 }

   687                 case opc_putstatic: {

   688                     int indx = readIntArg(byteCodes, i);

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

   690                     out.append(fi[0].replace('/', '_'));

   691                     out.append('.').append(fi[1]).append(" = s.pop();");

   692                     i += 2;

   693                     addReference(fi[0]);

   694                     break;

   695                 }

   696                 case opc_putfield: {

   697                     int indx = readIntArg(byteCodes, i);

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

   699                     out.append("{ var v = s.pop(); s.pop().fld_")

   700                        .append(fi[1]).append(" = v; }");

   701                     i += 2;

   702                     break;

   703                 }

   704                 case opc_checkcast: {

   705                     int indx = readIntArg(byteCodes, i);

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

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

   708                         // no way to check arrays right now

   709                         out.append("if(s[s.length - 1].$instOf_")

   710                            .append(type.replace('/', '_'))

   711                            .append(" != 1) throw {};"); // XXX proper exception

   712                     }

   713                     i += 2;

   714                     break;

   715                 }

   716                 case opc_instanceof: {

   717                     int indx = readIntArg(byteCodes, i);

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

   719                     out.append("s.push(s.pop().$instOf_")

   720                        .append(type.replace('/', '_'))

   721                        .append(" ? 1 : 0);");

   722                     i += 2;

   723                     break;

   724                 }

   725                 case opc_athrow: {

   726                     out.append("{ var t = s.pop(); s = new Array(1); s[0] = t; throw t; }");

   727                     break;

   728                 }

   729                 default: {

   730                     out.append("throw 'unknown bytecode " + c + "';");

   731                 }

   733             }

   734             out.append(" //");

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

   736                 out.append(" ");

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

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

   739             }

   740             out.append("\n");

   741         }

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

   743     }

   745     private int generateIf(byte[] byteCodes, int i, final String test) throws IOException {

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

   747         out.append("if (s.pop() ").append(test).append(" s.pop()) { gt = " + indx);

   748         out.append("; continue; }");

   749         return i + 2;

   750     }

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

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

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

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

   756     }

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

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

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

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

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

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

   763     }

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

   765         return (byteCodes[offsetInstruction] + 256) % 256;

   766     }

   768     private static void countArgs(String descriptor, boolean[] hasReturnType, StringBuilder sig, StringBuilder cnt) {

   769         int i = 0;

   770         Boolean count = null;

   771         boolean array = false;

   772         int firstPos = sig.length();

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

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

   775             switch (ch) {

   776                 case '(':

   777                     count = true;

   778                     continue;

   779                 case ')':

   780                     count = false;

   781                     continue;

   782                 case 'A':

   783                     array = true;

   784                     break;

   785                 case 'B':

   786                 case 'C':

   787                 case 'D':

   788                 case 'F':

   789                 case 'I':

   790                 case 'J':

   791                 case 'S':

   792                 case 'Z':

   793                     if (count) {

   794                         if (array) {

   795                             sig.append('A');

   796                         }

   797                         sig.append(ch);

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

   799                             cnt.append('1');

   800                         } else {

   801                             cnt.append('0');

   802                         }

   803                     } else {

   804                         hasReturnType[0] = true;

   805                         sig.insert(firstPos, ch);

   806                         if (array) {

   807                             sig.insert(firstPos, 'A');

   808                         }

   809                     }

   810                     array = false;

   811                     continue;

   812                 case 'V':

   813                     assert !count;

   814                     hasReturnType[0] = false;

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

   816                     continue;

   817                 case 'L':

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

   819                     if (count) {

   820                         if (array) {

   821                             sig.append('A');

   822                         }

   823                         sig.append(ch);

   824                         sig.append(descriptor.substring(i, next).replace('/', '_'));

   825                         cnt.append('0');

   826                     } else {

   827                         sig.insert(firstPos, descriptor.substring(i, next).replace('/', '_'));

   828                         sig.insert(firstPos, ch);

   829                         if (array) {

   830                             sig.insert(firstPos, 'A');

   831                         }

   832                         hasReturnType[0] = true;

   833                     }

   834                     i = next + 1;

   835                     continue;

   836                 case '[':

   837                     //arrays++;

   838                     continue;

   839                 default:

   840                     break; // invalid character

   841             }

   842         }

   843     }

   845     private String findMethodName(MethodData m, StringBuilder cnt) {

   846         StringBuilder name = new StringBuilder();

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

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

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

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

   851         } else {

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

   853         }

   855         boolean hasReturn[] = { false };

   856         countArgs(findDescriptor(m.getInternalSig()), hasReturn, name, cnt);

   857         return name.toString();

   858     }

   860     private String findMethodName(String[] mi, StringBuilder cnt, boolean[] hasReturn) {

   861         StringBuilder name = new StringBuilder();

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

   863         String nm= mi[1];

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

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

   866         } else {

   867             name.append(nm);

   868         }

   869         countArgs(findDescriptor(descr), hasReturn, name, cnt);

   870         return name.toString();

   871     }

   873     private int invokeStaticMethod(byte[] byteCodes, int i, boolean isStatic)

   874     throws IOException {

   875         int methodIndex = readIntArg(byteCodes, i);

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

   877         boolean[] hasReturn = { false };

   878         StringBuilder cnt = new StringBuilder();

   879         String mn = findMethodName(mi, cnt, hasReturn);

   880         out.append("{ ");

   881         for (int j = cnt.length() - 1; j >= 0; j--) {

   882             out.append("var v" + j).append(" = s.pop(); ");

   883         }

   885         if (hasReturn[0]) {

   886             out.append("s.push(");

   887         }

   888         final String in = mi[0];

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

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

   891         out.append(mn);

   892         out.append('(');

   893         String sep = "";

   894         if (!isStatic) {

   895             out.append("s.pop()");

   896             sep = ", ";

   897         }

   898         for (int j = 0; j < cnt.length(); j++) {

   899             out.append(sep);

   900             out.append("v" + j);

   901             sep = ", ";

   902         }

   903         out.append(")");

   904         if (hasReturn[0]) {

   905             out.append(")");

   906         }

   907         out.append("; }");

   908         i += 2;

   909         addReference(in);

   910         return i;

   911     }

   912     private int invokeVirtualMethod(byte[] byteCodes, int i)

   913     throws IOException {

   914         int methodIndex = readIntArg(byteCodes, i);

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

   916         boolean[] hasReturn = { false };

   917         StringBuilder cnt = new StringBuilder();

   918         String mn = findMethodName(mi, cnt, hasReturn);

   919         out.append("{ ");

   920         for (int j = cnt.length() - 1; j >= 0; j--) {

   921             out.append("var v" + j).append(" = s.pop(); ");

   922         }

   923         out.append("var self = s.pop(); ");

   924         if (hasReturn[0]) {

   925             out.append("s.push(");

   926         }

   927         out.append("self.");

   928         out.append(mn);

   929         out.append('(');

   930         out.append("self");

   931         for (int j = 0; j < cnt.length(); j++) {

   932             out.append(", ");

   933             out.append("v" + j);

   934         }

   935         out.append(")");

   936         if (hasReturn[0]) {

   937             out.append(")");

   938         }

   939         out.append("; }");

   940         i += 2;

   941         return i;

   942     }

   944     private void addReference(String cn) throws IOException {

   945         if (requireReference(cn)) {

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

   947         }

   948     }

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

   951         int arr = 0;

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

   953             out.append('A');

   954             d = d.substring(1);

   955         }

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

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

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

   959         } else {

   960             out.append(d);

   961         }

   962     }

   964     private String encodeConstant(int entryIndex) {

   965         String s = jc.stringValue(entryIndex, true);

   966         return s;

   967     }

   969     private String findDescriptor(String d) {

   970         return d.replace('[', 'A');

   971     }

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

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

   975         if (arr == null) {

   976             return false;

   977         }

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

   979         class P extends AnnotationParser {

   980             int cnt;

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

   982             String body;

   984             @Override

   985             protected void visitAttr(String type, String attr, String value) {

   986                 if (type.equals(jvmType)) {

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

   988                         body = value;

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

   990                         args[cnt++] = value;

   991                     } else {

   992                         throw new IllegalArgumentException(attr);

   993                     }

   994                 }

   995             }

   996         }

   997         P p = new P();

   998         p.parse(arr, jc);

   999         if (p.body == null) {

  1000             return false;

  1001         }

  1002         StringBuilder cnt = new StringBuilder();

  1003         out.append(prefix).append(findMethodName(m, cnt));

  1004         out.append(" = function(");

  1005         String space;

  1006         int index;

  1007         if (!isStatic) {

  1008             out.append(p.args[0]);

  1009             space = ",";

  1010             index = 1;

  1011         } else {

  1012             space = "";

  1013             index = 0;

  1014         }

  1015         for (int i = 0; i < cnt.length(); i++) {

  1016             out.append(space);

  1017             out.append(p.args[index]);

  1018             index++;

  1019             space = ",";

  1020         }

  1021         out.append(") {").append("\n");

  1022         out.append(p.body);

  1023         out.append("\n}\n");

  1024         return true;

  1025     }

  1026     private static String className(ClassData jc) {

  1027         //return jc.getName().getInternalName().replace('/', '_');

  1028         return jc.getClassName().replace('/', '_');

  1029     }

  1031     private static String[] findAnnotation(

  1032         byte[] arr, ClassData cd, final String className,

  1033         final String... attrNames

  1034     ) throws IOException {

  1035         if (arr == null) {

  1036             return null;

  1037         }

  1038         final String[] values = new String[attrNames.length];

  1039         final boolean[] found = { false };

  1040         final String jvmType = "L" + className.replace('.', '/') + ";";

  1041         AnnotationParser ap = new AnnotationParser() {

  1042             @Override

  1043             protected void visitAttr(String type, String attr, String value) {

  1044                 if (type.equals(jvmType)) {

  1045                     found[0] = true;

  1046                     for (int i = 0; i < attrNames.length; i++) {

  1047                         if (attrNames[i].equals(attr)) {

  1048                             values[i] = value;

  1049                         }

  1050                     }

  1051                 }

  1052             }

  1054         };

  1055         ap.parse(arr, cd);

  1056         return found[0] ? values : null;

  1057     }

  1059     private CharSequence initField(FieldData v) {

  1060         final String is = v.getInternalSig();

  1061         if (is.length() == 1) {

  1062             switch (is.charAt(0)) {

  1063                 case 'S':

  1064                 case 'J':

  1065                 case 'B':

  1066                 case 'Z':

  1067                 case 'C':

  1068                 case 'I': return " = 0;";

  1069                 case 'F':

  1070                 case 'D': return " = 0.0;";

  1071                 default:

  1072                     throw new IllegalStateException(is);

  1073             }

  1074         }

  1075         return " = null;";

  1076     }

  1077 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sun, 02 Dec 2012 06:25:28 +0100
changeset 232	36f16c49bdef
parent 226	907a52ed10e3
child 233	5e8f219d60ba
child 239	8ceee38f5840
permissions	-rw-r--r--