hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@3ee23267706c

     1 /**

     2  * Back 2 Browser Bytecode Translator

     3  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

     4  *

     5  * This program is free software: you can redistribute it and/or modify

     6  * it under the terms of the GNU General Public License as published by

     7  * the Free Software Foundation, version 2 of the License.

     8  *

     9  * This program is distributed in the hope that it will be useful,

    10  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12  * GNU General Public License for more details.

    13  *

    14  * You should have received a copy of the GNU General Public License

    15  * along with this program. Look for COPYING file in the top folder.

    16  * If not, see http://opensource.org/licenses/GPL-2.0.

    17  */

    18 package org.apidesign.vm4brwsr;

    20 import java.io.IOException;

    21 import java.io.InputStream;

    22 import org.apidesign.bck2brwsr.core.JavaScriptBody;

    23 import org.apidesign.javap.AnnotationParser;

    24 import org.apidesign.javap.ClassData;

    25 import org.apidesign.javap.FieldData;

    26 import org.apidesign.javap.MethodData;

    27 import org.apidesign.javap.StackMapIterator;

    28 import static org.apidesign.javap.RuntimeConstants.*;

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

    31  *

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

    33  */

    34 public abstract class ByteCodeToJavaScript {

    35     private ClassData jc;

    36     private final Appendable out;

    38     protected ByteCodeToJavaScript(Appendable out) {

    39         this.out = out;

    40     }

    42     /* Collects additional required resources.

    43      *

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

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

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

    47      */

    48     protected abstract boolean requireReference(String internalClassName);

    50     /*

    51      * @param resourcePath name of resources to read

    52      */

    53     protected abstract void requireScript(String resourcePath);

    55     /**

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

    57      *

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

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

    60      *

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

    62      */

    64     public String compile(InputStream classFile) throws IOException {

    65         this.jc = new ClassData(classFile);

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

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

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

    69             "resource", "processByteCode"

    70         );

    71         if (arr != null) {

    72             requireScript(arr[0]);

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

    74                 return null;

    75             }

    76         }

    77         StringArray toInitilize = new StringArray();

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

    79             if (m.isStatic()) {

    80                 generateStaticMethod(m, toInitilize);

    81             } else {

    82                 generateInstanceMethod(m);

    83             }

    84         }

    85         final String className = className(jc);

    86         out.append("\nfunction ").append(className);

    87         out.append("() {");

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

    89             if (!v.isStatic()) {

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

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

    92             }

    93         }

    94         out.append("\n}\n\nfunction ").append(className).append("_proto() {");

    95         out.append("\n  if (").append(className).

    96             append(".prototype.$instOf_").append(className).append(") {");

    97         out.append("\n    return new ").append(className).append(";");

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

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

   100             if (v.isStatic()) {

   101                 generateStaticField(v);

   102             }

   103         }

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

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

   106         if (sc != null) {

   107             out.append("\n  var p = ").append(className)

   108                .append(".prototype = ").

   109                 append(sc.replace('/', '_')).append("_proto();");

   110         } else {

   111             out.append("\n  var p = ").append(className).append(".prototype;");

   112         }

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

   114             if (!m.getName().contains("<cinit>")) {

   115                 generateMethodReference("\n  p.", m);

   116             }

   117         }

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

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

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

   121         }

   122         out.append("\n  return new ").append(className).append(";");

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

   124         out.append("\n").append(className).append("_proto();");

   125         StringBuilder sb = new StringBuilder();

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

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

   128         }

   129         return sb.toString();

   130     }

   131     private void generateStaticMethod(MethodData m, StringArray toInitilize) throws IOException {

   132         if (javaScriptBody(m, true)) {

   133             return;

   134         }

   135         StringBuilder argsCnt = new StringBuilder();

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

   137         out.append("\nfunction ").append(

   138             className(jc)

   139         ).append('_').append(mn);

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

   141             toInitilize.add(className(jc) + '_' + mn);

   142         }

   143         out.append('(');

   144         String space = "";

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

   146             out.append(space);

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

   148             space = ",";

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

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

   151                 index += 2;

   152             } else {

   153                 index++;

   154             }

   155         }

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

   157         if (m.getCode() != null) {

   158             int len = m.getMaxLocals();

   159             for (int i = argsCnt.length(); i < len; i++) {

   160                 out.append("  var ");

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

   162             }

   163             produceCode(m);

   164         } else {

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

   166         }

   167         out.append("}");

   168     }

   170     private void generateMethodReference(String prefix, MethodData m) throws IOException {

   171         final String name = findMethodName(m, new StringBuilder());

   172         out.append(prefix).append(name).append(" = ")

   173            .append(className(jc))

   174            .append('_').append(name).append(";");

   175     }

   177     private void generateInstanceMethod(MethodData m) throws IOException {

   178         if (javaScriptBody(m, false)) {

   179             return;

   180         }

   181         StringBuilder argsCnt = new StringBuilder();

   182         out.append("\nfunction ").append(

   183             className(jc)

   184         ).append('_').append(findMethodName(m, argsCnt));

   185         out.append("(arg0");

   186         String space = ",";

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

   188             out.append(space);

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

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

   191                 index += 2;

   192             } else {

   193                 index++;

   194             }

   195         }

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

   197         if (m.getCode() != null) {

   198             int len = m.getMaxLocals();

   199             for (int i = argsCnt.length(); i < len; i++) {

   200                 out.append("  var ");

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

   202             }

   203             produceCode(m);

   204         } else {

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

   206         }

   207         out.append("}");

   208     }

   210     private void produceCode(MethodData m) throws IOException {

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

   212         final StackMapIterator stackMapIterator = m.createStackMapIterator();

   213         final StackToVariableMapper mapper = new StackToVariableMapper();

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

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

   217         final int maxStack = m.getMaxStack();

   218         if (maxStack > 0) {

   219             out.append("\n  var ").append(mapper.constructVariableName(0));

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

   221                 out.append(", ");

   222                 out.append(mapper.constructVariableName(i));

   223             }

   224             out.append(';');

   225         }

   227         int lastStackFrame = -1;

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

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

   231             int prev = i;

   232             stackMapIterator.advanceTo(i);

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

   234                 lastStackFrame = stackMapIterator.getFrameIndex();

   235                 mapper.reset(stackMapIterator.getFrameStackItemsCount());

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

   237             } else {

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

   239             }

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

   241             switch (c) {

   242                 case opc_aload_0:

   243                 case opc_iload_0:

   244                 case opc_lload_0:

   245                 case opc_fload_0:

   246                 case opc_dload_0:

   247                     out.append(mapper.push()).append(" = arg0;");

   248                     break;

   249                 case opc_aload_1:

   250                 case opc_iload_1:

   251                 case opc_lload_1:

   252                 case opc_fload_1:

   253                 case opc_dload_1:

   254                     out.append(mapper.push()).append(" = arg1;");

   255                     break;

   256                 case opc_aload_2:

   257                 case opc_iload_2:

   258                 case opc_lload_2:

   259                 case opc_fload_2:

   260                 case opc_dload_2:

   261                     out.append(mapper.push()).append(" = arg2;");

   262                     break;

   263                 case opc_aload_3:

   264                 case opc_iload_3:

   265                 case opc_lload_3:

   266                 case opc_fload_3:

   267                 case opc_dload_3:

   268                     out.append(mapper.push()).append(" = arg3;");

   269                     break;

   270                 case opc_iload:

   271                 case opc_lload:

   272                 case opc_fload:

   273                 case opc_dload:

   274                 case opc_aload: {

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

   276                     out.append(mapper.push())

   277                        .append(" = arg")

   278                        .append(indx + ";");

   279                     break;

   280                 }

   281                 case opc_istore:

   282                 case opc_lstore:

   283                 case opc_fstore:

   284                 case opc_dstore:

   285                 case opc_astore: {

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

   287                     out.append("arg" + indx)

   288                        .append(" = ")

   289                        .append(mapper.pop())

   290                        .append(';');

   291                     break;

   292                 }

   293                 case opc_astore_0:

   294                 case opc_istore_0:

   295                 case opc_lstore_0:

   296                 case opc_fstore_0:

   297                 case opc_dstore_0:

   298                     out.append("arg0 = ").append(mapper.pop()).append(';');

   299                     break;

   300                 case opc_astore_1:

   301                 case opc_istore_1:

   302                 case opc_lstore_1:

   303                 case opc_fstore_1:

   304                 case opc_dstore_1:

   305                     out.append("arg1 = ").append(mapper.pop()).append(';');

   306                     break;

   307                 case opc_astore_2:

   308                 case opc_istore_2:

   309                 case opc_lstore_2:

   310                 case opc_fstore_2:

   311                 case opc_dstore_2:

   312                     out.append("arg2 = ").append(mapper.pop()).append(';');

   313                     break;

   314                 case opc_astore_3:

   315                 case opc_istore_3:

   316                 case opc_lstore_3:

   317                 case opc_fstore_3:

   318                 case opc_dstore_3:

   319                     out.append("arg3 = ").append(mapper.pop()).append(';');

   320                     break;

   321                 case opc_iadd:

   322                 case opc_ladd:

   323                 case opc_fadd:

   324                 case opc_dadd:

   325                     out.append(mapper.get(1)).append(" += ")

   326                        .append(mapper.pop()).append(';');

   327                     break;

   328                 case opc_isub:

   329                 case opc_lsub:

   330                 case opc_fsub:

   331                 case opc_dsub:

   332                     out.append(mapper.get(1)).append(" -= ")

   333                        .append(mapper.pop()).append(';');

   334                     break;

   335                 case opc_imul:

   336                 case opc_lmul:

   337                 case opc_fmul:

   338                 case opc_dmul:

   339                     out.append(mapper.get(1)).append(" *= ")

   340                        .append(mapper.pop()).append(';');

   341                     break;

   342                 case opc_idiv:

   343                 case opc_ldiv:

   344                     out.append(mapper.get(1))

   345                        .append(" = Math.floor(")

   346                        .append(mapper.get(1))

   347                        .append(" / ")

   348                        .append(mapper.pop())

   349                        .append(");");

   350                     break;

   351                 case opc_fdiv:

   352                 case opc_ddiv:

   353                     out.append(mapper.get(1)).append(" /= ")

   354                        .append(mapper.pop()).append(';');

   355                     break;

   356                 case opc_irem:

   357                 case opc_lrem:

   358                 case opc_frem:

   359                 case opc_drem:

   360                     out.append(mapper.get(1)).append(" %= ")

   361                        .append(mapper.pop()).append(';');

   362                     break;

   363                 case opc_iand:

   364                 case opc_land:

   365                     out.append(mapper.get(1)).append(" &= ")

   366                        .append(mapper.pop()).append(';');

   367                     break;

   368                 case opc_ior:

   369                 case opc_lor:

   370                     out.append(mapper.get(1)).append(" |= ")

   371                        .append(mapper.pop()).append(';');

   372                     break;

   373                 case opc_ixor:

   374                 case opc_lxor:

   375                     out.append(mapper.get(1)).append(" ^= ")

   376                        .append(mapper.pop()).append(';');

   377                     break;

   378                 case opc_ineg:

   379                 case opc_lneg:

   380                 case opc_fneg:

   381                 case opc_dneg:

   382                     out.append(mapper.get(0)).append(" = -")

   383                        .append(mapper.get(0)).append(';');

   384                     break;

   385                 case opc_ishl:

   386                 case opc_lshl:

   387                     out.append(mapper.get(1)).append(" <<= ")

   388                        .append(mapper.pop()).append(';');

   389                     break;

   390                 case opc_ishr:

   391                 case opc_lshr:

   392                     out.append(mapper.get(1)).append(" >>= ")

   393                        .append(mapper.pop()).append(';');

   394                     break;

   395                 case opc_iushr:

   396                 case opc_lushr:

   397                     out.append(mapper.get(1)).append(" >>>= ")

   398                        .append(mapper.pop()).append(';');

   399                     break;

   400                 case opc_iinc: {

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

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

   403                     if (incrBy == 1) {

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

   405                     } else {

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

   407                     }

   408                     break;

   409                 }

   410                 case opc_return:

   411                     out.append("return;");

   412                     break;

   413                 case opc_ireturn:

   414                 case opc_lreturn:

   415                 case opc_freturn:

   416                 case opc_dreturn:

   417                 case opc_areturn:

   418                     out.append("return ").append(mapper.pop()).append(';');

   419                     break;

   420                 case opc_i2l:

   421                 case opc_i2f:

   422                 case opc_i2d:

   423                 case opc_l2i:

   424                     // max int check?

   425                 case opc_l2f:

   426                 case opc_l2d:

   427                 case opc_f2d:

   428                 case opc_d2f:

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

   430                     break;

   431                 case opc_f2i:

   432                 case opc_f2l:

   433                 case opc_d2i:

   434                 case opc_d2l:

   435                     out.append(mapper.get(0))

   436                        .append(" = Math.floor(")

   437                        .append(mapper.get(0))

   438                        .append(");");

   439                     break;

   440                 case opc_i2b:

   441                 case opc_i2c:

   442                 case opc_i2s:

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

   444                     break;

   445                 case opc_aconst_null:

   446                     out.append(mapper.push()).append(" = null;");

   447                     break;

   448                 case opc_iconst_m1:

   449                     out.append(mapper.push()).append(" = -1;");

   450                     break;

   451                 case opc_iconst_0:

   452                 case opc_dconst_0:

   453                 case opc_lconst_0:

   454                 case opc_fconst_0:

   455                     out.append(mapper.push()).append(" = 0;");

   456                     break;

   457                 case opc_iconst_1:

   458                 case opc_lconst_1:

   459                 case opc_fconst_1:

   460                 case opc_dconst_1:

   461                     out.append(mapper.push()).append(" = 1;");

   462                     break;

   463                 case opc_iconst_2:

   464                 case opc_fconst_2:

   465                     out.append(mapper.push()).append(" = 2;");

   466                     break;

   467                 case opc_iconst_3:

   468                     out.append(mapper.push()).append(" = 3;");

   469                     break;

   470                 case opc_iconst_4:

   471                     out.append(mapper.push()).append(" = 4;");

   472                     break;

   473                 case opc_iconst_5:

   474                     out.append(mapper.push()).append(" = 5;");

   475                     break;

   476                 case opc_ldc: {

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

   478                     String v = encodeConstant(indx);

   479                     out.append(mapper.push())

   480                        .append(" = ")

   481                        .append(v)

   482                        .append(';');

   483                     break;

   484                 }

   485                 case opc_ldc_w:

   486                 case opc_ldc2_w: {

   487                     int indx = readIntArg(byteCodes, i);

   488                     i += 2;

   489                     String v = encodeConstant(indx);

   490                     out.append(mapper.push())

   491                        .append(" = ")

   492                        .append(v)

   493                        .append(';');

   494                     break;

   495                 }

   496                 case opc_lcmp:

   497                 case opc_fcmpl:

   498                 case opc_fcmpg:

   499                 case opc_dcmpl:

   500                 case opc_dcmpg: {

   501                     out.append(mapper.get(1))

   502                        .append(" = (")

   503                        .append(mapper.get(1))

   504                        .append(" == ")

   505                        .append(mapper.get(0))

   506                        .append(") ? 0 : ((")

   507                        .append(mapper.get(1))

   508                        .append(" < ")

   509                        .append(mapper.get(0))

   510                        .append(") ? -1 : 1);");

   512                     mapper.pop(1);

   513                     break;

   514                 }

   515                 case opc_if_acmpeq:

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

   517                     break;

   518                 case opc_if_acmpne:

   519                     i = generateIf(byteCodes, i, mapper, "!=");

   520                     break;

   521                 case opc_if_icmpeq: {

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

   523                     break;

   524                 }

   525                 case opc_ifeq: {

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

   527                     out.append("if (").append(mapper.pop())

   528                                       .append(" == 0) { gt = " + indx);

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

   530                     i += 2;

   531                     break;

   532                 }

   533                 case opc_ifne: {

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

   535                     out.append("if (").append(mapper.pop())

   536                                       .append(" != 0) { gt = " + indx);

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

   538                     i += 2;

   539                     break;

   540                 }

   541                 case opc_iflt: {

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

   543                     out.append("if (").append(mapper.pop())

   544                                       .append(" < 0) { gt = " + indx);

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

   546                     i += 2;

   547                     break;

   548                 }

   549                 case opc_ifle: {

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

   551                     out.append("if (").append(mapper.pop())

   552                                       .append(" <= 0) { gt = " + indx);

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

   554                     i += 2;

   555                     break;

   556                 }

   557                 case opc_ifgt: {

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

   559                     out.append("if (").append(mapper.pop())

   560                                       .append(" > 0) { gt = " + indx);

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

   562                     i += 2;

   563                     break;

   564                 }

   565                 case opc_ifge: {

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

   567                     out.append("if (").append(mapper.pop())

   568                                       .append(" >= 0) { gt = " + indx);

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

   570                     i += 2;

   571                     break;

   572                 }

   573                 case opc_ifnonnull: {

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

   575                     out.append("if (").append(mapper.pop())

   576                                       .append(" !== null) { gt = " + indx);

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

   578                     i += 2;

   579                     break;

   580                 }

   581                 case opc_ifnull: {

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

   583                     out.append("if (").append(mapper.pop())

   584                                       .append(" === null) { gt = " + indx);

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

   586                     i += 2;

   587                     break;

   588                 }

   589                 case opc_if_icmpne:

   590                     i = generateIf(byteCodes, i, mapper, "!=");

   591                     break;

   592                 case opc_if_icmplt:

   593                     i = generateIf(byteCodes, i, mapper, "<");

   594                     break;

   595                 case opc_if_icmple:

   596                     i = generateIf(byteCodes, i, mapper, "<=");

   597                     break;

   598                 case opc_if_icmpgt:

   599                     i = generateIf(byteCodes, i, mapper, ">");

   600                     break;

   601                 case opc_if_icmpge:

   602                     i = generateIf(byteCodes, i, mapper, ">=");

   603                     break;

   604                 case opc_goto: {

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

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

   607                     i += 2;

   608                     break;

   609                 }

   610                 case opc_lookupswitch: {

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

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

   613                     table += 4;

   614                     int n = readInt4(byteCodes, table);

   615                     table += 4;

   616                     out.append("switch (").append(mapper.pop()).append(") {\n");

   617                     while (n-- > 0) {

   618                         int cnstnt = readInt4(byteCodes, table);

   619                         table += 4;

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

   621                         table += 4;

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

   623                     }

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

   625                     i = table - 1;

   626                     break;

   627                 }

   628                 case opc_tableswitch: {

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

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

   631                     table += 4;

   632                     int low = readInt4(byteCodes, table);

   633                     table += 4;

   634                     int high = readInt4(byteCodes, table);

   635                     table += 4;

   636                     out.append("switch (").append(mapper.pop()).append(") {\n");

   637                     while (low <= high) {

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

   639                         table += 4;

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

   641                         low++;

   642                     }

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

   644                     i = table - 1;

   645                     break;

   646                 }

   647                 case opc_invokeinterface: {

   648                     i = invokeVirtualMethod(byteCodes, i, mapper) + 2;

   649                     break;

   650                 }

   651                 case opc_invokevirtual:

   652                     i = invokeVirtualMethod(byteCodes, i, mapper);

   653                     break;

   654                 case opc_invokespecial:

   655                     i = invokeStaticMethod(byteCodes, i, mapper, false);

   656                     break;

   657                 case opc_invokestatic:

   658                     i = invokeStaticMethod(byteCodes, i, mapper, true);

   659                     break;

   660                 case opc_new: {

   661                     int indx = readIntArg(byteCodes, i);

   662                     String ci = jc.getClassName(indx);

   663                     out.append(mapper.push()).append(" = ");

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

   665                     out.append(';');

   666                     addReference(ci);

   667                     i += 2;

   668                     break;

   669                 }

   670                 case opc_newarray: {

   671                     ++i; // skip type of array

   672                     out.append(mapper.get(0))

   673                        .append(" = new Array(")

   674                        .append(mapper.get(0))

   675                        .append(").fillNulls();");

   676                     break;

   677                 }

   678                 case opc_anewarray: {

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

   680                     out.append(mapper.get(0))

   681                        .append(" = new Array(")

   682                        .append(mapper.get(0))

   683                        .append(").fillNulls();");

   684                     break;

   685                 }

   686                 case opc_multianewarray: {

   687                     i += 2;

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

   689                     out.append("{ var a0 = new Array(").append(mapper.pop())

   690                        .append(").fillNulls();");

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

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

   693                            .append(mapper.pop()).append(';');

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

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

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

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

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

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

   700                             append(";");

   701                     }

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

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

   704                     }

   705                     out.append("\n").append(mapper.push()).append(" = a0; }");

   706                     break;

   707                 }

   708                 case opc_arraylength:

   709                     out.append(mapper.get(0)).append(" = ")

   710                        .append(mapper.get(0)).append(".length;");

   711                     break;

   712                 case opc_iastore:

   713                 case opc_lastore:

   714                 case opc_fastore:

   715                 case opc_dastore:

   716                 case opc_aastore:

   717                 case opc_bastore:

   718                 case opc_castore:

   719                 case opc_sastore: {

   720                     out.append(mapper.get(2))

   721                        .append('[').append(mapper.get(1)).append(']')

   722                        .append(" = ")

   723                        .append(mapper.get(0))

   724                        .append(';');

   725                     mapper.pop(3);

   726                     break;

   727                 }

   728                 case opc_iaload:

   729                 case opc_laload:

   730                 case opc_faload:

   731                 case opc_daload:

   732                 case opc_aaload:

   733                 case opc_baload:

   734                 case opc_caload:

   735                 case opc_saload: {

   736                     out.append(mapper.get(1))

   737                        .append(" = ")

   738                        .append(mapper.get(1))

   739                        .append('[').append(mapper.pop()).append("];");

   740                     break;

   741                 }

   742                 case opc_pop:

   743                 case opc_pop2:

   744                     mapper.pop(1);

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

   746                     break;

   747                 case opc_dup:

   748                     out.append(mapper.push()).append(" = ")

   749                        .append(mapper.get(1)).append(';');

   750                     break;

   751                 case opc_dup_x1:

   752                     out.append("{ ");

   753                     out.append(mapper.push()).append(" = ")

   754                        .append(mapper.get(1)).append("; ");

   755                     out.append(mapper.get(1)).append(" = ")

   756                        .append(mapper.get(2)).append("; ");

   757                     out.append(mapper.get(2)).append(" = ")

   758                        .append(mapper.get(0)).append("; ");

   759                     out.append('}');

   760                     break;

   761                 case opc_dup_x2:

   762                     out.append("{ ");

   763                     out.append(mapper.push()).append(" = ")

   764                        .append(mapper.get(1)).append("; ");

   765                     out.append(mapper.get(1)).append(" = ")

   766                        .append(mapper.get(2)).append("; ");

   767                     out.append(mapper.get(2)).append(" = ")

   768                        .append(mapper.get(3)).append("; ");

   769                     out.append(mapper.get(3)).append(" = ")

   770                        .append(mapper.get(0)).append("; ");

   771                     out.append('}');

   772                     break;

   773                 case opc_bipush:

   774                     out.append(mapper.push()).append(" = ")

   775                        .append(Integer.toString(byteCodes[++i])).append(';');

   776                     break;

   777                 case opc_sipush:

   778                     out.append(mapper.push()).append(" = ")

   779                        .append(Integer.toString(readIntArg(byteCodes, i)))

   780                        .append(';');

   781                     i += 2;

   782                     break;

   783                 case opc_getfield: {

   784                     int indx = readIntArg(byteCodes, i);

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

   786                     out.append(mapper.get(0)).append(" = ")

   787                        .append(mapper.get(0)).append(".fld_")

   788                        .append(fi[1]).append(';');

   789                     i += 2;

   790                     break;

   791                 }

   792                 case opc_getstatic: {

   793                     int indx = readIntArg(byteCodes, i);

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

   795                     out.append(mapper.push()).append(" = ")

   796                        .append(fi[0].replace('/', '_'))

   797                        .append('.').append(fi[1]).append(';');

   798                     i += 2;

   799                     addReference(fi[0]);

   800                     break;

   801                 }

   802                 case opc_putstatic: {

   803                     int indx = readIntArg(byteCodes, i);

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

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

   806                     out.append('.').append(fi[1]).append(" = ")

   807                        .append(mapper.pop()).append(';');

   808                     i += 2;

   809                     addReference(fi[0]);

   810                     break;

   811                 }

   812                 case opc_putfield: {

   813                     int indx = readIntArg(byteCodes, i);

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

   815                     out.append(mapper.get(1)).append(".fld_").append(fi[1])

   816                        .append(" = ")

   817                        .append(mapper.get(0)).append(';');

   818                     mapper.pop(2);

   819                     i += 2;

   820                     break;

   821                 }

   822                 case opc_checkcast: {

   823                     int indx = readIntArg(byteCodes, i);

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

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

   826                         // no way to check arrays right now

   827                         out.append("if (").append(mapper.get(0))

   828                            .append(".$instOf_").append(type.replace('/', '_'))

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

   830                     }

   831                     i += 2;

   832                     break;

   833                 }

   834                 case opc_instanceof: {

   835                     int indx = readIntArg(byteCodes, i);

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

   837                     out.append(mapper.get(0)).append(" = ")

   838                        .append(mapper.get(0)).append(".$instOf_")

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

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

   841                     i += 2;

   842                     break;

   843                 }

   844                 case opc_athrow: {

   845                     out.append("{ ");

   846                     out.append(mapper.bottom()).append(" = ")

   847                        .append(mapper.top()).append("; ");

   848                     out.append("throw ").append(mapper.bottom()).append("; ");

   849                     out.append('}');

   851                     mapper.reset(1);

   852                     break;

   853                 }

   855                 case opc_monitorenter: {

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

   857                     mapper.pop(1);

   858                     break;

   859                 }

   861                 case opc_monitorexit: {

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

   863                     mapper.pop(1);

   864                     break;

   865                 }

   867                 default: {

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

   869                 }

   871             }

   872             out.append(" //");

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

   874                 out.append(" ");

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

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

   877             }

   878             out.append("\n");

   879         }

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

   882         if (mapper.getMaxStackSize() > maxStack) {

   883             throw new IllegalStateException("Incorrect stack usage");

   884         }

   885     }

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

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

   889         out.append("if (").append(mapper.get(1))

   890            .append(' ').append(test).append(' ')

   891            .append(mapper.get(0)).append(") { gt = " + indx)

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

   893         mapper.pop(2);

   894         return i + 2;

   895     }

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

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

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

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

   901     }

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

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

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

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

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

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

   908     }

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

   910         return byteCodes[offsetInstruction] & 0xff;

   911     }

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

   914         int i = 0;

   915         Boolean count = null;

   916         boolean array = false;

   917         int firstPos = sig.length();

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

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

   920             switch (ch) {

   921                 case '(':

   922                     count = true;

   923                     continue;

   924                 case ')':

   925                     count = false;

   926                     continue;

   927                 case 'A':

   928                     array = true;

   929                     break;

   930                 case 'B':

   931                 case 'C':

   932                 case 'D':

   933                 case 'F':

   934                 case 'I':

   935                 case 'J':

   936                 case 'S':

   937                 case 'Z':

   938                     if (count) {

   939                         if (array) {

   940                             sig.append('A');

   941                         }

   942                         sig.append(ch);

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

   944                             cnt.append('1');

   945                         } else {

   946                             cnt.append('0');

   947                         }

   948                     } else {

   949                         hasReturnType[0] = true;

   950                         sig.insert(firstPos, ch);

   951                         if (array) {

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

   953                         }

   954                     }

   955                     array = false;

   956                     continue;

   957                 case 'V':

   958                     assert !count;

   959                     hasReturnType[0] = false;

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

   961                     continue;

   962                 case 'L':

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

   964                     if (count) {

   965                         if (array) {

   966                             sig.append('A');

   967                         }

   968                         sig.append(ch);

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

   970                         cnt.append('0');

   971                     } else {

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

   973                         sig.insert(firstPos, ch);

   974                         if (array) {

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

   976                         }

   977                         hasReturnType[0] = true;

   978                     }

   979                     i = next + 1;

   980                     continue;

   981                 case '[':

   982                     //arrays++;

   983                     continue;

   984                 default:

   985                     break; // invalid character

   986             }

   987         }

   988     }

   990     private void generateStaticField(FieldData v) throws IOException {

   991         out.append("\n  ")

   992            .append(className(jc))

   993            .append('.').append(v.getName()).append(initField(v));

   994     }

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

   997         StringBuilder name = new StringBuilder();

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

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

  1000         } else if ("<clinit>".equals(m.getName())) { // NOI18N

  1001             name.append("class"); // NOI18N

  1002         } else {

  1003             name.append(m.getName());

  1004         }

  1006         boolean hasReturn[] = { false };

  1007         countArgs(findDescriptor(m.getInternalSig()), hasReturn, name, cnt);

  1008         return name.toString();

  1009     }

  1011     private String findMethodName(String[] mi, StringBuilder cnt, boolean[] hasReturn) {

  1012         StringBuilder name = new StringBuilder();

  1013         String descr = mi[2];//mi.getDescriptor();

  1014         String nm= mi[1];

  1015         if ("<init>".equals(nm)) { // NOI18N

  1016             name.append("cons"); // NOI18N

  1017         } else {

  1018             name.append(nm);

  1019         }

  1020         countArgs(findDescriptor(descr), hasReturn, name, cnt);

  1021         return name.toString();

  1022     }

  1024     private int invokeStaticMethod(byte[] byteCodes, int i, final StackToVariableMapper mapper, boolean isStatic)

  1025     throws IOException {

  1026         int methodIndex = readIntArg(byteCodes, i);

  1027         String[] mi = jc.getFieldInfoName(methodIndex);

  1028         boolean[] hasReturn = { false };

  1029         StringBuilder cnt = new StringBuilder();

  1030         String mn = findMethodName(mi, cnt, hasReturn);

  1032         final int numArguments = isStatic ? cnt.length() : cnt.length() + 1;

  1034         if (hasReturn[0]) {

  1035             out.append((numArguments > 0) ? mapper.get(numArguments - 1)

  1036                                           : mapper.push()).append(" = ");

  1037         }

  1039         final String in = mi[0];

  1040         out.append(in.replace('/', '_'));

  1041         out.append(".prototype.");

  1042         out.append(mn);

  1043         out.append('(');

  1044         if (numArguments > 0) {

  1045             out.append(mapper.get(numArguments - 1));

  1046             for (int j = numArguments - 2; j >= 0; --j) {

  1047                 out.append(", ");

  1048                 out.append(mapper.get(j));

  1049             }

  1050         }

  1051         out.append(");");

  1052         if (numArguments > 0) {

  1053             mapper.pop(hasReturn[0] ? numArguments - 1 : numArguments);

  1054         }

  1055         i += 2;

  1056         addReference(in);

  1057         return i;

  1058     }

  1059     private int invokeVirtualMethod(byte[] byteCodes, int i, final StackToVariableMapper mapper)

  1060     throws IOException {

  1061         int methodIndex = readIntArg(byteCodes, i);

  1062         String[] mi = jc.getFieldInfoName(methodIndex);

  1063         boolean[] hasReturn = { false };

  1064         StringBuilder cnt = new StringBuilder();

  1065         String mn = findMethodName(mi, cnt, hasReturn);

  1067         final int numArguments = cnt.length();

  1069         if (hasReturn[0]) {

  1070             out.append(mapper.get(numArguments)).append(" = ");

  1071         }

  1073         out.append(mapper.get(numArguments)).append('.');

  1074         out.append(mn);

  1075         out.append('(');

  1076         out.append(mapper.get(numArguments));

  1077         for (int j = numArguments - 1; j >= 0; --j) {

  1078             out.append(", ");

  1079             out.append(mapper.get(j));

  1080         }

  1081         out.append(");");

  1082         mapper.pop(hasReturn[0] ? numArguments : numArguments + 1);

  1083         i += 2;

  1084         return i;

  1085     }

  1087     private void addReference(String cn) throws IOException {

  1088         if (requireReference(cn)) {

  1089             out.append(" /* needs ").append(cn).append(" */");

  1090         }

  1091     }

  1093     private void outType(String d, StringBuilder out) {

  1094         int arr = 0;

  1095         while (d.charAt(0) == '[') {

  1096             out.append('A');

  1097             d = d.substring(1);

  1098         }

  1099         if (d.charAt(0) == 'L') {

  1100             assert d.charAt(d.length() - 1) == ';';

  1101             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1102         } else {

  1103             out.append(d);

  1104         }

  1105     }

  1107     private String encodeConstant(int entryIndex) {

  1108         String s = jc.stringValue(entryIndex, true);

  1109         return s;

  1110     }

  1112     private String findDescriptor(String d) {

  1113         return d.replace('[', 'A');

  1114     }

  1116     private boolean javaScriptBody(MethodData m, boolean isStatic) throws IOException {

  1117         byte[] arr = m.findAnnotationData(true);

  1118         if (arr == null) {

  1119             return false;

  1120         }

  1121         final String jvmType = "L" + JavaScriptBody.class.getName().replace('.', '/') + ";";

  1122         class P extends AnnotationParser {

  1123             int cnt;

  1124             String[] args = new String[30];

  1125             String body;

  1127             @Override

  1128             protected void visitAttr(String type, String attr, String value) {

  1129                 if (type.equals(jvmType)) {

  1130                     if ("body".equals(attr)) {

  1131                         body = value;

  1132                     } else if ("args".equals(attr)) {

  1133                         args[cnt++] = value;

  1134                     } else {

  1135                         throw new IllegalArgumentException(attr);

  1136                     }

  1137                 }

  1138             }

  1139         }

  1140         P p = new P();

  1141         p.parse(arr, jc);

  1142         if (p.body == null) {

  1143             return false;

  1144         }

  1145         StringBuilder cnt = new StringBuilder();

  1146         out.append("\nfunction ").append(className(jc)).append('_').

  1147             append(findMethodName(m, cnt));

  1148         out.append("(");

  1149         String space;

  1150         int index;

  1151         if (!isStatic) {

  1152             out.append(p.args[0]);

  1153             space = ",";

  1154             index = 1;

  1155         } else {

  1156             space = "";

  1157             index = 0;

  1158         }

  1159         for (int i = 0; i < cnt.length(); i++) {

  1160             out.append(space);

  1161             out.append(p.args[index]);

  1162             index++;

  1163             space = ",";

  1164         }

  1165         out.append(") {").append("\n");

  1166         out.append(p.body);

  1167         out.append("\n}\n");

  1168         return true;

  1169     }

  1170     private static String className(ClassData jc) {

  1171         //return jc.getName().getInternalName().replace('/', '_');

  1172         return jc.getClassName().replace('/', '_');

  1173     }

  1175     private static String[] findAnnotation(

  1176         byte[] arr, ClassData cd, final String className,

  1177         final String... attrNames

  1178     ) throws IOException {

  1179         if (arr == null) {

  1180             return null;

  1181         }

  1182         final String[] values = new String[attrNames.length];

  1183         final boolean[] found = { false };

  1184         final String jvmType = "L" + className.replace('.', '/') + ";";

  1185         AnnotationParser ap = new AnnotationParser() {

  1186             @Override

  1187             protected void visitAttr(String type, String attr, String value) {

  1188                 if (type.equals(jvmType)) {

  1189                     found[0] = true;

  1190                     for (int i = 0; i < attrNames.length; i++) {

  1191                         if (attrNames[i].equals(attr)) {

  1192                             values[i] = value;

  1193                         }

  1194                     }

  1195                 }

  1196             }

  1198         };

  1199         ap.parse(arr, cd);

  1200         return found[0] ? values : null;

  1201     }

  1203     private CharSequence initField(FieldData v) {

  1204         final String is = v.getInternalSig();

  1205         if (is.length() == 1) {

  1206             switch (is.charAt(0)) {

  1207                 case 'S':

  1208                 case 'J':

  1209                 case 'B':

  1210                 case 'Z':

  1211                 case 'C':

  1212                 case 'I': return " = 0;";

  1213                 case 'F':

  1214                 case 'D': return " = 0.0;";

  1215                 default:

  1216                     throw new IllegalStateException(is);

  1217             }

  1218         }

  1219         return " = null;";

  1220     }

  1221 }

author	Lubomir Nerad <lubomir.nerad@oracle.com>
	Thu, 29 Nov 2012 20:19:00 +0100
branch	registers
changeset 221	3ee23267706c
parent 191	c18c3df35966
child 242	8bd4adaf6590
permissions	-rw-r--r--