hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@8ceee38f5840

     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         String[] proto = findAnnotation(arrData, jc,

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

    87             "container", "prototype"

    88         );

    89         StringArray toInitilize = new StringArray();

    90         final String className = className(jc);

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

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

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

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

    95             if (v.isStatic()) {

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

    97             }

    98         }

    99         if (proto == null) {

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

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

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

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

   104         } else {

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

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

   107         }

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

   109             if (m.isStatic()) {

   110                 generateStaticMethod("\n    c.", m, toInitilize);

   111             } else {

   112                 generateInstanceMethod("\n    c.", m);

   113             }

   114         }

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

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

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

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

   119         }

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

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

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

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

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

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

   126             if (!v.isStatic()) {

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

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

   129             }

   130         }

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

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

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

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

   135         StringBuilder sb = new StringBuilder();

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

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

   138         }

   139         return sb.toString();

   140     }

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

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

   143             return;

   144         }

   145         StringBuilder argsCnt = new StringBuilder();

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

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

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

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

   150         }

   151         out.append('(');

   152         String space = "";

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

   154             out.append(space);

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

   156             space = ",";

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

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

   159                 index += 2;

   160             } else {

   161                 index++;

   162             }

   163         }

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

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

   166         if (code != null) {

   167             int len = m.getMaxLocals();

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

   169                 out.append("  var ");

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

   171             }

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

   173             produceCode(code);

   174         } else {

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

   176         }

   177         out.append("};");

   178     }

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

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

   182             return;

   183         }

   184         StringBuilder argsCnt = new StringBuilder();

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

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

   187         out.append("(arg0");

   188         String space = ",";

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

   190             out.append(space);

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

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

   193                 index += 2;

   194             } else {

   195                 index++;

   196             }

   197         }

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

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

   200         if (code != null) {

   201             int len = m.getMaxLocals();

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

   203                 out.append("  var ");

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

   205             }

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

   207             produceCode(code);

   208         } else {

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

   210         }

   211         out.append("};");

   212     }

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

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

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

   217             int prev = i;

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

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

   220             switch (c) {

   221                 case opc_aload_0:

   222                 case opc_iload_0:

   223                 case opc_lload_0:

   224                 case opc_fload_0:

   225                 case opc_dload_0:

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

   227                     break;

   228                 case opc_aload_1:

   229                 case opc_iload_1:

   230                 case opc_lload_1:

   231                 case opc_fload_1:

   232                 case opc_dload_1:

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

   234                     break;

   235                 case opc_aload_2:

   236                 case opc_iload_2:

   237                 case opc_lload_2:

   238                 case opc_fload_2:

   239                 case opc_dload_2:

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

   241                     break;

   242                 case opc_aload_3:

   243                 case opc_iload_3:

   244                 case opc_lload_3:

   245                 case opc_fload_3:

   246                 case opc_dload_3:

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

   248                     break;

   249                 case opc_iload:

   250                 case opc_lload:

   251                 case opc_fload:

   252                 case opc_dload:

   253                 case opc_aload: {

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

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

   256                     break;

   257                 }

   258                 case opc_istore:

   259                 case opc_lstore:

   260                 case opc_fstore:

   261                 case opc_dstore:

   262                 case opc_astore: {

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

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

   265                     break;

   266                 }

   267                 case opc_astore_0:

   268                 case opc_istore_0:

   269                 case opc_lstore_0:

   270                 case opc_fstore_0:

   271                 case opc_dstore_0:

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

   273                     break;

   274                 case opc_astore_1:

   275                 case opc_istore_1:

   276                 case opc_lstore_1:

   277                 case opc_fstore_1:

   278                 case opc_dstore_1:

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

   280                     break;

   281                 case opc_astore_2:

   282                 case opc_istore_2:

   283                 case opc_lstore_2:

   284                 case opc_fstore_2:

   285                 case opc_dstore_2:

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

   287                     break;

   288                 case opc_astore_3:

   289                 case opc_istore_3:

   290                 case opc_lstore_3:

   291                 case opc_fstore_3:

   292                 case opc_dstore_3:

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

   294                     break;

   295                 case opc_iadd:

   296                 case opc_ladd:

   297                 case opc_fadd:

   298                 case opc_dadd:

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

   300                     break;

   301                 case opc_isub:

   302                 case opc_lsub:

   303                 case opc_fsub:

   304                 case opc_dsub:

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

   306                     break;

   307                 case opc_imul:

   308                 case opc_lmul:

   309                 case opc_fmul:

   310                 case opc_dmul:

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

   312                     break;

   313                 case opc_idiv:

   314                 case opc_ldiv:

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

   316                     break;

   317                 case opc_fdiv:

   318                 case opc_ddiv:

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

   320                     break;

   321                 case opc_irem:

   322                 case opc_lrem:

   323                 case opc_frem:

   324                 case opc_drem:

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

   326                     break;

   327                 case opc_iand:

   328                 case opc_land:

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

   330                     break;

   331                 case opc_ior:

   332                 case opc_lor:

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

   334                     break;

   335                 case opc_ixor:

   336                 case opc_lxor:

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

   338                     break;

   339                 case opc_ineg:

   340                 case opc_lneg:

   341                 case opc_fneg:

   342                 case opc_dneg:

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

   344                     break;

   345                 case opc_ishl:

   346                 case opc_lshl:

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

   348                     break;

   349                 case opc_ishr:

   350                 case opc_lshr:

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

   352                     break;

   353                 case opc_iushr:

   354                 case opc_lushr:

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

   356                     break;

   357                 case opc_iinc: {

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

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

   360                     if (incrBy == 1) {

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

   362                     } else {

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

   364                     }

   365                     break;

   366                 }

   367                 case opc_return:

   368                     out.append("return;");

   369                     break;

   370                 case opc_ireturn:

   371                 case opc_lreturn:

   372                 case opc_freturn:

   373                 case opc_dreturn:

   374                 case opc_areturn:

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

   376                     break;

   377                 case opc_i2l:

   378                 case opc_i2f:

   379                 case opc_i2d:

   380                 case opc_l2i:

   381                     // max int check?

   382                 case opc_l2f:

   383                 case opc_l2d:

   384                 case opc_f2d:

   385                 case opc_d2f:

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

   387                     break;

   388                 case opc_f2i:

   389                 case opc_f2l:

   390                 case opc_d2i:

   391                 case opc_d2l:

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

   393                     break;

   394                 case opc_i2b:

   395                 case opc_i2c:

   396                 case opc_i2s:

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

   398                     break;

   399                 case opc_aconst_null:

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

   401                     break;

   402                 case opc_iconst_m1:

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

   404                     break;

   405                 case opc_iconst_0:

   406                 case opc_dconst_0:

   407                 case opc_lconst_0:

   408                 case opc_fconst_0:

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

   410                     break;

   411                 case opc_iconst_1:

   412                 case opc_lconst_1:

   413                 case opc_fconst_1:

   414                 case opc_dconst_1:

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

   416                     break;

   417                 case opc_iconst_2:

   418                 case opc_fconst_2:

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

   420                     break;

   421                 case opc_iconst_3:

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

   423                     break;

   424                 case opc_iconst_4:

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

   426                     break;

   427                 case opc_iconst_5:

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

   429                     break;

   430                 case opc_ldc: {

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

   432                     String v = encodeConstant(indx);

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

   434                     break;

   435                 }

   436                 case opc_ldc_w:

   437                 case opc_ldc2_w: {

   438                     int indx = readIntArg(byteCodes, i);

   439                     i += 2;

   440                     String v = encodeConstant(indx);

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

   442                     break;

   443                 }

   444                 case opc_lcmp:

   445                 case opc_fcmpl:

   446                 case opc_fcmpg:

   447                 case opc_dcmpl:

   448                 case opc_dcmpg: {

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

   450                     break;

   451                 }

   452                 case opc_if_acmpeq:

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

   454                     break;

   455                 case opc_if_acmpne:

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

   457                     break;

   458                 case opc_if_icmpeq: {

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

   460                     break;

   461                 }

   462                 case opc_ifeq: {

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

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

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

   466                     i += 2;

   467                     break;

   468                 }

   469                 case opc_ifne: {

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

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

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

   473                     i += 2;

   474                     break;

   475                 }

   476                 case opc_iflt: {

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

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

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

   480                     i += 2;

   481                     break;

   482                 }

   483                 case opc_ifle: {

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

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

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

   487                     i += 2;

   488                     break;

   489                 }

   490                 case opc_ifgt: {

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

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

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

   494                     i += 2;

   495                     break;

   496                 }

   497                 case opc_ifge: {

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

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

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

   501                     i += 2;

   502                     break;

   503                 }

   504                 case opc_ifnonnull: {

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

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

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

   508                     i += 2;

   509                     break;

   510                 }

   511                 case opc_ifnull: {

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

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

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

   515                     i += 2;

   516                     break;

   517                 }

   518                 case opc_if_icmpne:

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

   520                     break;

   521                 case opc_if_icmplt:

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

   523                     break;

   524                 case opc_if_icmple:

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

   526                     break;

   527                 case opc_if_icmpgt:

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

   529                     break;

   530                 case opc_if_icmpge:

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

   532                     break;

   533                 case opc_goto: {

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

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

   536                     i += 2;

   537                     break;

   538                 }

   539                 case opc_lookupswitch: {

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

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

   542                     table += 4;

   543                     int n = readInt4(byteCodes, table);

   544                     table += 4;

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

   546                     while (n-- > 0) {

   547                         int cnstnt = readInt4(byteCodes, table);

   548                         table += 4;

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

   550                         table += 4;

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

   552                     }

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

   554                     i = table - 1;

   555                     break;

   556                 }

   557                 case opc_tableswitch: {

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

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

   560                     table += 4;

   561                     int low = readInt4(byteCodes, table);

   562                     table += 4;

   563                     int high = readInt4(byteCodes, table);

   564                     table += 4;

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

   566                     while (low <= high) {

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

   568                         table += 4;

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

   570                         low++;

   571                     }

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

   573                     i = table - 1;

   574                     break;

   575                 }

   576                 case opc_invokeinterface: {

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

   578                     break;

   579                 }

   580                 case opc_invokevirtual:

   581                     i = invokeVirtualMethod(byteCodes, i);

   582                     break;

   583                 case opc_invokespecial:

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

   585                     break;

   586                 case opc_invokestatic:

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

   588                     break;

   589                 case opc_new: {

   590                     int indx = readIntArg(byteCodes, i);

   591                     String ci = jc.getClassName(indx);

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

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

   594                     out.append("());");

   595                     addReference(ci);

   596                     i += 2;

   597                     break;

   598                 }

   599                 case opc_newarray: {

   600                     int type = byteCodes[i++];

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

   602                     break;

   603                 }

   604                 case opc_anewarray: {

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

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

   607                     break;

   608                 }

   609                 case opc_multianewarray: {

   610                     i += 2;

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

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

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

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

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

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

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

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

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

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

   621                             append(";");

   622                     }

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

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

   625                     }

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

   627                     break;

   628                 }

   629                 case opc_arraylength:

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

   631                     break;

   632                 case opc_iastore:

   633                 case opc_lastore:

   634                 case opc_fastore:

   635                 case opc_dastore:

   636                 case opc_aastore:

   637                 case opc_bastore:

   638                 case opc_castore:

   639                 case opc_sastore: {

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

   641                     break;

   642                 }

   643                 case opc_iaload:

   644                 case opc_laload:

   645                 case opc_faload:

   646                 case opc_daload:

   647                 case opc_aaload:

   648                 case opc_baload:

   649                 case opc_caload:

   650                 case opc_saload: {

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

   652                     break;

   653                 }

   654                 case opc_pop2:

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

   656                 case opc_pop:

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

   658                     break;

   659                 case opc_dup:

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

   661                     break;

   662                 case opc_dup_x1:

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

   664                     break;

   665                 case opc_dup_x2:

   666                     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); }");

   667                     break;

   668                 case opc_bipush:

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

   670                     break;

   671                 case opc_sipush:

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

   673                     i += 2;

   674                     break;

   675                 case opc_getfield: {

   676                     int indx = readIntArg(byteCodes, i);

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

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

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

   680                     i += 2;

   681                     break;

   682                 }

   683                 case opc_getstatic: {

   684                     int indx = readIntArg(byteCodes, i);

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

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

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

   688                     i += 2;

   689                     addReference(fi[0]);

   690                     break;

   691                 }

   692                 case opc_putstatic: {

   693                     int indx = readIntArg(byteCodes, i);

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

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

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

   697                     i += 2;

   698                     addReference(fi[0]);

   699                     break;

   700                 }

   701                 case opc_putfield: {

   702                     int indx = readIntArg(byteCodes, i);

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

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

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

   706                     i += 2;

   707                     break;

   708                 }

   709                 case opc_checkcast: {

   710                     int indx = readIntArg(byteCodes, i);

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

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

   713                         // no way to check arrays right now

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

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

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

   717                     }

   718                     i += 2;

   719                     break;

   720                 }

   721                 case opc_instanceof: {

   722                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   727                     i += 2;

   728                     break;

   729                 }

   730                 case opc_athrow: {

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

   732                     break;

   733                 }

   734                 default: {

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

   736                 }

   738             }

   739             out.append(" //");

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

   741                 out.append(" ");

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

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

   744             }

   745             out.append("\n");

   746         }

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

   748     }

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

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

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

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

   754         return i + 2;

   755     }

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

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

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

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

   761     }

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

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

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

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

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

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

   768     }

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

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

   771     }

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

   774         int i = 0;

   775         Boolean count = null;

   776         boolean array = false;

   777         int firstPos = sig.length();

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

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

   780             switch (ch) {

   781                 case '(':

   782                     count = true;

   783                     continue;

   784                 case ')':

   785                     count = false;

   786                     continue;

   787                 case 'A':

   788                     array = true;

   789                     break;

   790                 case 'B':

   791                 case 'C':

   792                 case 'D':

   793                 case 'F':

   794                 case 'I':

   795                 case 'J':

   796                 case 'S':

   797                 case 'Z':

   798                     if (count) {

   799                         if (array) {

   800                             sig.append('A');

   801                         }

   802                         sig.append(ch);

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

   804                             cnt.append('1');

   805                         } else {

   806                             cnt.append('0');

   807                         }

   808                     } else {

   809                         hasReturnType[0] = true;

   810                         sig.insert(firstPos, ch);

   811                         if (array) {

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

   813                         }

   814                     }

   815                     array = false;

   816                     continue;

   817                 case 'V':

   818                     assert !count;

   819                     hasReturnType[0] = false;

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

   821                     continue;

   822                 case 'L':

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

   824                     if (count) {

   825                         if (array) {

   826                             sig.append('A');

   827                         }

   828                         sig.append(ch);

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

   830                         cnt.append('0');

   831                     } else {

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

   833                         sig.insert(firstPos, ch);

   834                         if (array) {

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

   836                         }

   837                         hasReturnType[0] = true;

   838                     }

   839                     i = next + 1;

   840                     continue;

   841                 case '[':

   842                     //arrays++;

   843                     continue;

   844                 default:

   845                     break; // invalid character

   846             }

   847         }

   848     }

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

   851         StringBuilder name = new StringBuilder();

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

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

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

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

   856         } else {

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

   858         }

   860         boolean hasReturn[] = { false };

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

   862         return name.toString();

   863     }

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

   866         StringBuilder name = new StringBuilder();

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

   868         String nm= mi[1];

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

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

   871         } else {

   872             name.append(nm);

   873         }

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

   875         return name.toString();

   876     }

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

   879     throws IOException {

   880         int methodIndex = readIntArg(byteCodes, i);

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

   882         boolean[] hasReturn = { false };

   883         StringBuilder cnt = new StringBuilder();

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

   885         out.append("{ ");

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

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

   888         }

   890         if (hasReturn[0]) {

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

   892         }

   893         final String in = mi[0];

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

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

   896         out.append(mn);

   897         out.append('(');

   898         String sep = "";

   899         if (!isStatic) {

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

   901             sep = ", ";

   902         }

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

   904             out.append(sep);

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

   906             sep = ", ";

   907         }

   908         out.append(")");

   909         if (hasReturn[0]) {

   910             out.append(")");

   911         }

   912         out.append("; }");

   913         i += 2;

   914         addReference(in);

   915         return i;

   916     }

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

   918     throws IOException {

   919         int methodIndex = readIntArg(byteCodes, i);

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

   921         boolean[] hasReturn = { false };

   922         StringBuilder cnt = new StringBuilder();

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

   924         out.append("{ ");

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

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

   927         }

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

   929         if (hasReturn[0]) {

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

   931         }

   932         out.append("self.");

   933         out.append(mn);

   934         out.append('(');

   935         out.append("self");

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

   937             out.append(", ");

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

   939         }

   940         out.append(")");

   941         if (hasReturn[0]) {

   942             out.append(")");

   943         }

   944         out.append("; }");

   945         i += 2;

   946         return i;

   947     }

   949     private void addReference(String cn) throws IOException {

   950         if (requireReference(cn)) {

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

   952         }

   953     }

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

   956         int arr = 0;

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

   958             out.append('A');

   959             d = d.substring(1);

   960         }

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

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

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

   964         } else {

   965             out.append(d);

   966         }

   967     }

   969     private String encodeConstant(int entryIndex) {

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

   971         return s;

   972     }

   974     private String findDescriptor(String d) {

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

   976     }

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

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

   980         if (arr == null) {

   981             return false;

   982         }

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

   984         class P extends AnnotationParser {

   985             int cnt;

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

   987             String body;

   989             @Override

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

   991                 if (type.equals(jvmType)) {

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

   993                         body = value;

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

   995                         args[cnt++] = value;

   996                     } else {

   997                         throw new IllegalArgumentException(attr);

   998                     }

   999                 }

  1000             }

  1001         }

  1002         P p = new P();

  1003         p.parse(arr, jc);

  1004         if (p.body == null) {

  1005             return false;

  1006         }

  1007         StringBuilder cnt = new StringBuilder();

  1008         out.append(prefix).append(findMethodName(m, cnt));

  1009         out.append(" = function(");

  1010         String space;

  1011         int index;

  1012         if (!isStatic) {

  1013             out.append(p.args[0]);

  1014             space = ",";

  1015             index = 1;

  1016         } else {

  1017             space = "";

  1018             index = 0;

  1019         }

  1020         for (int i = 0; i < cnt.length(); i++) {

  1021             out.append(space);

  1022             out.append(p.args[index]);

  1023             index++;

  1024             space = ",";

  1025         }

  1026         out.append(") {").append("\n");

  1027         out.append(p.body);

  1028         out.append("\n}\n");

  1029         return true;

  1030     }

  1031     private static String className(ClassData jc) {

  1032         //return jc.getName().getInternalName().replace('/', '_');

  1033         return jc.getClassName().replace('/', '_');

  1034     }

  1036     private static String[] findAnnotation(

  1037         byte[] arr, ClassData cd, final String className,

  1038         final String... attrNames

  1039     ) throws IOException {

  1040         if (arr == null) {

  1041             return null;

  1042         }

  1043         final String[] values = new String[attrNames.length];

  1044         final boolean[] found = { false };

  1045         final String jvmType = "L" + className.replace('.', '/') + ";";

  1046         AnnotationParser ap = new AnnotationParser() {

  1047             @Override

  1048             protected void visitAttr(String type, String attr, String value) {

  1049                 if (type.equals(jvmType)) {

  1050                     found[0] = true;

  1051                     for (int i = 0; i < attrNames.length; i++) {

  1052                         if (attrNames[i].equals(attr)) {

  1053                             values[i] = value;

  1054                         }

  1055                     }

  1056                 }

  1057             }

  1059         };

  1060         ap.parse(arr, cd);

  1061         return found[0] ? values : null;

  1062     }

  1064     private CharSequence initField(FieldData v) {

  1065         final String is = v.getInternalSig();

  1066         if (is.length() == 1) {

  1067             switch (is.charAt(0)) {

  1068                 case 'S':

  1069                 case 'J':

  1070                 case 'B':

  1071                 case 'Z':

  1072                 case 'C':

  1073                 case 'I': return " = 0;";

  1074                 case 'F':

  1075                 case 'D': return " = 0.0;";

  1076                 default:

  1077                     throw new IllegalStateException(is);

  1078             }

  1079         }

  1080         return " = null;";

  1081     }

  1082 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sun, 02 Dec 2012 21:00:12 +0100
changeset 239	8ceee38f5840
parent 232	36f16c49bdef
child 240	4e88a33d7972
permissions	-rw-r--r--