hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@7c26f96bba59

     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.$instOf_").append(className).append(" = true;");

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

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

   113         }

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

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

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

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

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

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

   120             if (!v.isStatic()) {

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

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

   123             }

   124         }

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

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

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

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

   129         StringBuilder sb = new StringBuilder();

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

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

   132         }

   133         return sb.toString();

   134     }

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

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

   137             return;

   138         }

   139         StringBuilder argsCnt = new StringBuilder();

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

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

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

   143             toInitilize.add(className(jc) + "(true)." + mn);

   144         }

   145         out.append('(');

   146         String space = "";

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

   148             out.append(space);

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

   150             space = ",";

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

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

   153                 index += 2;

   154             } else {

   155                 index++;

   156             }

   157         }

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

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

   160         if (code != null) {

   161             int len = m.getMaxLocals();

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

   163                 out.append("  var ");

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

   165             }

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

   167             produceCode(code);

   168         } else {

   169             out.append("  /* no code found for ").append(m.getInternalSig()).append(" */\n");

   170         }

   171         out.append("};");

   172     }

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

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

   176             return;

   177         }

   178         StringBuilder argsCnt = new StringBuilder();

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

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

   181         out.append("(arg0");

   182         String space = ",";

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

   184             out.append(space);

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

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

   187                 index += 2;

   188             } else {

   189                 index++;

   190             }

   191         }

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

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

   194         if (code != null) {

   195             int len = m.getMaxLocals();

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

   197                 out.append("  var ");

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

   199             }

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

   201             produceCode(code);

   202         } else {

   203             out.append("  /* no code found for ").append(m.getInternalSig()).append(" */\n");

   204         }

   205         out.append("};");

   206     }

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

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

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

   211             int prev = i;

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

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

   214             switch (c) {

   215                 case opc_aload_0:

   216                 case opc_iload_0:

   217                 case opc_lload_0:

   218                 case opc_fload_0:

   219                 case opc_dload_0:

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

   221                     break;

   222                 case opc_aload_1:

   223                 case opc_iload_1:

   224                 case opc_lload_1:

   225                 case opc_fload_1:

   226                 case opc_dload_1:

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

   228                     break;

   229                 case opc_aload_2:

   230                 case opc_iload_2:

   231                 case opc_lload_2:

   232                 case opc_fload_2:

   233                 case opc_dload_2:

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

   235                     break;

   236                 case opc_aload_3:

   237                 case opc_iload_3:

   238                 case opc_lload_3:

   239                 case opc_fload_3:

   240                 case opc_dload_3:

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

   242                     break;

   243                 case opc_iload:

   244                 case opc_lload:

   245                 case opc_fload:

   246                 case opc_dload:

   247                 case opc_aload: {

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

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

   250                     break;

   251                 }

   252                 case opc_istore:

   253                 case opc_lstore:

   254                 case opc_fstore:

   255                 case opc_dstore:

   256                 case opc_astore: {

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

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

   259                     break;

   260                 }

   261                 case opc_astore_0:

   262                 case opc_istore_0:

   263                 case opc_lstore_0:

   264                 case opc_fstore_0:

   265                 case opc_dstore_0:

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

   267                     break;

   268                 case opc_astore_1:

   269                 case opc_istore_1:

   270                 case opc_lstore_1:

   271                 case opc_fstore_1:

   272                 case opc_dstore_1:

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

   274                     break;

   275                 case opc_astore_2:

   276                 case opc_istore_2:

   277                 case opc_lstore_2:

   278                 case opc_fstore_2:

   279                 case opc_dstore_2:

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

   281                     break;

   282                 case opc_astore_3:

   283                 case opc_istore_3:

   284                 case opc_lstore_3:

   285                 case opc_fstore_3:

   286                 case opc_dstore_3:

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

   288                     break;

   289                 case opc_iadd:

   290                 case opc_ladd:

   291                 case opc_fadd:

   292                 case opc_dadd:

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

   294                     break;

   295                 case opc_isub:

   296                 case opc_lsub:

   297                 case opc_fsub:

   298                 case opc_dsub:

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

   300                     break;

   301                 case opc_imul:

   302                 case opc_lmul:

   303                 case opc_fmul:

   304                 case opc_dmul:

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

   306                     break;

   307                 case opc_idiv:

   308                 case opc_ldiv:

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

   310                     break;

   311                 case opc_fdiv:

   312                 case opc_ddiv:

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

   314                     break;

   315                 case opc_irem:

   316                 case opc_lrem:

   317                 case opc_frem:

   318                 case opc_drem:

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

   320                     break;

   321                 case opc_iand:

   322                 case opc_land:

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

   324                     break;

   325                 case opc_ior:

   326                 case opc_lor:

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

   328                     break;

   329                 case opc_ixor:

   330                 case opc_lxor:

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

   332                     break;

   333                 case opc_ineg:

   334                 case opc_lneg:

   335                 case opc_fneg:

   336                 case opc_dneg:

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

   338                     break;

   339                 case opc_ishl:

   340                 case opc_lshl:

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

   342                     break;

   343                 case opc_ishr:

   344                 case opc_lshr:

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

   346                     break;

   347                 case opc_iushr:

   348                 case opc_lushr:

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

   350                     break;

   351                 case opc_iinc: {

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

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

   354                     if (incrBy == 1) {

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

   356                     } else {

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

   358                     }

   359                     break;

   360                 }

   361                 case opc_return:

   362                     out.append("return;");

   363                     break;

   364                 case opc_ireturn:

   365                 case opc_lreturn:

   366                 case opc_freturn:

   367                 case opc_dreturn:

   368                 case opc_areturn:

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

   370                     break;

   371                 case opc_i2l:

   372                 case opc_i2f:

   373                 case opc_i2d:

   374                 case opc_l2i:

   375                     // max int check?

   376                 case opc_l2f:

   377                 case opc_l2d:

   378                 case opc_f2d:

   379                 case opc_d2f:

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

   381                     break;

   382                 case opc_f2i:

   383                 case opc_f2l:

   384                 case opc_d2i:

   385                 case opc_d2l:

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

   387                     break;

   388                 case opc_i2b:

   389                 case opc_i2c:

   390                 case opc_i2s:

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

   392                     break;

   393                 case opc_aconst_null:

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

   395                     break;

   396                 case opc_iconst_m1:

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

   398                     break;

   399                 case opc_iconst_0:

   400                 case opc_dconst_0:

   401                 case opc_lconst_0:

   402                 case opc_fconst_0:

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

   404                     break;

   405                 case opc_iconst_1:

   406                 case opc_lconst_1:

   407                 case opc_fconst_1:

   408                 case opc_dconst_1:

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

   410                     break;

   411                 case opc_iconst_2:

   412                 case opc_fconst_2:

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

   414                     break;

   415                 case opc_iconst_3:

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

   417                     break;

   418                 case opc_iconst_4:

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

   420                     break;

   421                 case opc_iconst_5:

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

   423                     break;

   424                 case opc_ldc: {

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

   426                     String v = encodeConstant(indx);

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

   428                     break;

   429                 }

   430                 case opc_ldc_w:

   431                 case opc_ldc2_w: {

   432                     int indx = readIntArg(byteCodes, i);

   433                     i += 2;

   434                     String v = encodeConstant(indx);

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

   436                     break;

   437                 }

   438                 case opc_lcmp:

   439                 case opc_fcmpl:

   440                 case opc_fcmpg:

   441                 case opc_dcmpl:

   442                 case opc_dcmpg: {

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

   444                     break;

   445                 }

   446                 case opc_if_acmpeq:

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

   448                     break;

   449                 case opc_if_acmpne:

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

   451                     break;

   452                 case opc_if_icmpeq: {

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

   454                     break;

   455                 }

   456                 case opc_ifeq: {

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

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

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

   460                     i += 2;

   461                     break;

   462                 }

   463                 case opc_ifne: {

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

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

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

   467                     i += 2;

   468                     break;

   469                 }

   470                 case opc_iflt: {

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

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

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

   474                     i += 2;

   475                     break;

   476                 }

   477                 case opc_ifle: {

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

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

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

   481                     i += 2;

   482                     break;

   483                 }

   484                 case opc_ifgt: {

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

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

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

   488                     i += 2;

   489                     break;

   490                 }

   491                 case opc_ifge: {

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

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

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

   495                     i += 2;

   496                     break;

   497                 }

   498                 case opc_ifnonnull: {

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

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

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

   502                     i += 2;

   503                     break;

   504                 }

   505                 case opc_ifnull: {

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

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

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

   509                     i += 2;

   510                     break;

   511                 }

   512                 case opc_if_icmpne:

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

   514                     break;

   515                 case opc_if_icmplt:

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

   517                     break;

   518                 case opc_if_icmple:

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

   520                     break;

   521                 case opc_if_icmpgt:

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

   523                     break;

   524                 case opc_if_icmpge:

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

   526                     break;

   527                 case opc_goto: {

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

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

   530                     i += 2;

   531                     break;

   532                 }

   533                 case opc_lookupswitch: {

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

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

   536                     table += 4;

   537                     int n = readInt4(byteCodes, table);

   538                     table += 4;

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

   540                     while (n-- > 0) {

   541                         int cnstnt = readInt4(byteCodes, table);

   542                         table += 4;

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

   544                         table += 4;

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

   546                     }

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

   548                     i = table - 1;

   549                     break;

   550                 }

   551                 case opc_tableswitch: {

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

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

   554                     table += 4;

   555                     int low = readInt4(byteCodes, table);

   556                     table += 4;

   557                     int high = readInt4(byteCodes, table);

   558                     table += 4;

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

   560                     while (low <= high) {

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

   562                         table += 4;

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

   564                         low++;

   565                     }

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

   567                     i = table - 1;

   568                     break;

   569                 }

   570                 case opc_invokeinterface: {

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

   572                     break;

   573                 }

   574                 case opc_invokevirtual:

   575                     i = invokeVirtualMethod(byteCodes, i);

   576                     break;

   577                 case opc_invokespecial:

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

   579                     break;

   580                 case opc_invokestatic:

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

   582                     break;

   583                 case opc_new: {

   584                     int indx = readIntArg(byteCodes, i);

   585                     String ci = jc.getClassName(indx);

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

   587                     out.append("new ").append(ci.replace('/','_'));

   588                     out.append(");");

   589                     addReference(ci);

   590                     i += 2;

   591                     break;

   592                 }

   593                 case opc_newarray: {

   594                     int type = byteCodes[i++];

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

   596                     break;

   597                 }

   598                 case opc_anewarray: {

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

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

   601                     break;

   602                 }

   603                 case opc_multianewarray: {

   604                     i += 2;

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

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

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

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

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

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

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

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

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

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

   615                             append(";");

   616                     }

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

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

   619                     }

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

   621                     break;

   622                 }

   623                 case opc_arraylength:

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

   625                     break;

   626                 case opc_iastore:

   627                 case opc_lastore:

   628                 case opc_fastore:

   629                 case opc_dastore:

   630                 case opc_aastore:

   631                 case opc_bastore:

   632                 case opc_castore:

   633                 case opc_sastore: {

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

   635                     break;

   636                 }

   637                 case opc_iaload:

   638                 case opc_laload:

   639                 case opc_faload:

   640                 case opc_daload:

   641                 case opc_aaload:

   642                 case opc_baload:

   643                 case opc_caload:

   644                 case opc_saload: {

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

   646                     break;

   647                 }

   648                 case opc_pop2:

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

   650                 case opc_pop:

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

   652                     break;

   653                 case opc_dup:

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

   655                     break;

   656                 case opc_dup_x1:

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

   658                     break;

   659                 case opc_dup_x2:

   660                     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); }");

   661                     break;

   662                 case opc_bipush:

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

   664                     break;

   665                 case opc_sipush:

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

   667                     i += 2;

   668                     break;

   669                 case opc_getfield: {

   670                     int indx = readIntArg(byteCodes, i);

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

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

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

   674                     i += 2;

   675                     break;

   676                 }

   677                 case opc_getstatic: {

   678                     int indx = readIntArg(byteCodes, i);

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

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

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

   682                     i += 2;

   683                     addReference(fi[0]);

   684                     break;

   685                 }

   686                 case opc_putstatic: {

   687                     int indx = readIntArg(byteCodes, i);

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

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

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

   691                     i += 2;

   692                     addReference(fi[0]);

   693                     break;

   694                 }

   695                 case opc_putfield: {

   696                     int indx = readIntArg(byteCodes, i);

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

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

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

   700                     i += 2;

   701                     break;

   702                 }

   703                 case opc_checkcast: {

   704                     int indx = readIntArg(byteCodes, i);

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

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

   707                         // no way to check arrays right now

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

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

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

   711                     }

   712                     i += 2;

   713                     break;

   714                 }

   715                 case opc_instanceof: {

   716                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   721                     i += 2;

   722                     break;

   723                 }

   724                 case opc_athrow: {

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

   726                     break;

   727                 }

   728                 default: {

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

   730                 }

   732             }

   733             out.append(" //");

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

   735                 out.append(" ");

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

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

   738             }

   739             out.append("\n");

   740         }

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

   742     }

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

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

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

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

   748         return i + 2;

   749     }

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

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

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

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

   755     }

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

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

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

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

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

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

   762     }

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

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

   765     }

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

   768         int i = 0;

   769         Boolean count = null;

   770         boolean array = false;

   771         int firstPos = sig.length();

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

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

   774             switch (ch) {

   775                 case '(':

   776                     count = true;

   777                     continue;

   778                 case ')':

   779                     count = false;

   780                     continue;

   781                 case 'A':

   782                     array = true;

   783                     break;

   784                 case 'B':

   785                 case 'C':

   786                 case 'D':

   787                 case 'F':

   788                 case 'I':

   789                 case 'J':

   790                 case 'S':

   791                 case 'Z':

   792                     if (count) {

   793                         if (array) {

   794                             sig.append('A');

   795                         }

   796                         sig.append(ch);

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

   798                             cnt.append('1');

   799                         } else {

   800                             cnt.append('0');

   801                         }

   802                     } else {

   803                         hasReturnType[0] = true;

   804                         sig.insert(firstPos, ch);

   805                         if (array) {

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

   807                         }

   808                     }

   809                     array = false;

   810                     continue;

   811                 case 'V':

   812                     assert !count;

   813                     hasReturnType[0] = false;

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

   815                     continue;

   816                 case 'L':

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

   818                     if (count) {

   819                         if (array) {

   820                             sig.append('A');

   821                         }

   822                         sig.append(ch);

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

   824                         cnt.append('0');

   825                     } else {

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

   827                         sig.insert(firstPos, ch);

   828                         if (array) {

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

   830                         }

   831                         hasReturnType[0] = true;

   832                     }

   833                     i = next + 1;

   834                     continue;

   835                 case '[':

   836                     //arrays++;

   837                     continue;

   838                 default:

   839                     break; // invalid character

   840             }

   841         }

   842     }

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

   845         StringBuilder name = new StringBuilder();

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

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

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

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

   850         } else {

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

   852         }

   854         boolean hasReturn[] = { false };

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

   856         return name.toString();

   857     }

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

   860         StringBuilder name = new StringBuilder();

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

   862         String nm= mi[1];

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

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

   865         } else {

   866             name.append(nm);

   867         }

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

   869         return name.toString();

   870     }

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

   873     throws IOException {

   874         int methodIndex = readIntArg(byteCodes, i);

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

   876         boolean[] hasReturn = { false };

   877         StringBuilder cnt = new StringBuilder();

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

   879         out.append("{ ");

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

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

   882         }

   884         if (hasReturn[0]) {

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

   886         }

   887         final String in = mi[0];

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

   889         out.append("(true).");

   890         out.append(mn);

   891         out.append('(');

   892         String sep = "";

   893         if (!isStatic) {

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

   895             sep = ", ";

   896         }

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

   898             out.append(sep);

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

   900             sep = ", ";

   901         }

   902         out.append(")");

   903         if (hasReturn[0]) {

   904             out.append(")");

   905         }

   906         out.append("; }");

   907         i += 2;

   908         addReference(in);

   909         return i;

   910     }

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

   912     throws IOException {

   913         int methodIndex = readIntArg(byteCodes, i);

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

   915         boolean[] hasReturn = { false };

   916         StringBuilder cnt = new StringBuilder();

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

   918         out.append("{ ");

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

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

   921         }

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

   923         if (hasReturn[0]) {

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

   925         }

   926         out.append("self.");

   927         out.append(mn);

   928         out.append('(');

   929         out.append("self");

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

   931             out.append(", ");

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

   933         }

   934         out.append(")");

   935         if (hasReturn[0]) {

   936             out.append(")");

   937         }

   938         out.append("; }");

   939         i += 2;

   940         return i;

   941     }

   943     private void addReference(String cn) throws IOException {

   944         if (requireReference(cn)) {

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

   946         }

   947     }

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

   950         int arr = 0;

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

   952             out.append('A');

   953             d = d.substring(1);

   954         }

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

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

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

   958         } else {

   959             out.append(d);

   960         }

   961     }

   963     private String encodeConstant(int entryIndex) {

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

   965         return s;

   966     }

   968     private String findDescriptor(String d) {

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

   970     }

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

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

   974         if (arr == null) {

   975             return false;

   976         }

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

   978         class P extends AnnotationParser {

   979             int cnt;

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

   981             String body;

   983             @Override

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

   985                 if (type.equals(jvmType)) {

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

   987                         body = value;

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

   989                         args[cnt++] = value;

   990                     } else {

   991                         throw new IllegalArgumentException(attr);

   992                     }

   993                 }

   994             }

   995         }

   996         P p = new P();

   997         p.parse(arr, jc);

   998         if (p.body == null) {

   999             return false;

  1000         }

  1001         StringBuilder cnt = new StringBuilder();

  1002         out.append(prefix).append(findMethodName(m, cnt));

  1003         out.append(" = function(");

  1004         String space;

  1005         int index;

  1006         if (!isStatic) {

  1007             out.append(p.args[0]);

  1008             space = ",";

  1009             index = 1;

  1010         } else {

  1011             space = "";

  1012             index = 0;

  1013         }

  1014         for (int i = 0; i < cnt.length(); i++) {

  1015             out.append(space);

  1016             out.append(p.args[index]);

  1017             index++;

  1018             space = ",";

  1019         }

  1020         out.append(") {").append("\n");

  1021         out.append(p.body);

  1022         out.append("\n}\n");

  1023         return true;

  1024     }

  1025     private static String className(ClassData jc) {

  1026         //return jc.getName().getInternalName().replace('/', '_');

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

  1028     }

  1030     private static String[] findAnnotation(

  1031         byte[] arr, ClassData cd, final String className,

  1032         final String... attrNames

  1033     ) throws IOException {

  1034         if (arr == null) {

  1035             return null;

  1036         }

  1037         final String[] values = new String[attrNames.length];

  1038         final boolean[] found = { false };

  1039         final String jvmType = "L" + className.replace('.', '/') + ";";

  1040         AnnotationParser ap = new AnnotationParser() {

  1041             @Override

  1042             protected void visitAttr(String type, String attr, String value) {

  1043                 if (type.equals(jvmType)) {

  1044                     found[0] = true;

  1045                     for (int i = 0; i < attrNames.length; i++) {

  1046                         if (attrNames[i].equals(attr)) {

  1047                             values[i] = value;

  1048                         }

  1049                     }

  1050                 }

  1051             }

  1053         };

  1054         ap.parse(arr, cd);

  1055         return found[0] ? values : null;

  1056     }

  1058     private CharSequence initField(FieldData v) {

  1059         final String is = v.getInternalSig();

  1060         if (is.length() == 1) {

  1061             switch (is.charAt(0)) {

  1062                 case 'S':

  1063                 case 'J':

  1064                 case 'B':

  1065                 case 'Z':

  1066                 case 'C':

  1067                 case 'I': return " = 0;";

  1068                 case 'F':

  1069                 case 'D': return " = 0.0;";

  1070                 default:

  1071                     throw new IllegalStateException(is);

  1072             }

  1073         }

  1074         return " = null;";

  1075     }

  1076 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Thu, 29 Nov 2012 11:07:05 +0100
changeset 220	7c26f96bba59
parent 213	9dc53108d3df
child 224	7aa36c48c634
child 225	25e350c6385f
permissions	-rw-r--r--