hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@fae5261c8a9a

     1 /**

     2  * Back 2 Browser Bytecode Translator

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

     4  *

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

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

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

     8  *

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

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

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

    12  * GNU General Public License for more details.

    13  *

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

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

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

    17  */

    18 package org.apidesign.vm4brwsr;

    20 import java.io.IOException;

    21 import java.io.InputStream;

    22 import org.apidesign.javap.AnnotationParser;

    23 import org.apidesign.javap.ClassData;

    24 import org.apidesign.javap.FieldData;

    25 import org.apidesign.javap.MethodData;

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

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

    29  *

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

    31  */

    32 public abstract class ByteCodeToJavaScript {

    33     private ClassData jc;

    34     private final Appendable out;

    36     protected ByteCodeToJavaScript(Appendable out) {

    37         this.out = out;

    38     }

    40     /* Collects additional required resources.

    41      *

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

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

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

    45      */

    46     protected abstract boolean requireReference(String internalClassName);

    48     /*

    49      * @param resourcePath name of resources to read

    50      */

    51     protected abstract void requireScript(String resourcePath);

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

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

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

    56      *

    57      * @param className suggested name of the class

    58      */

    59     protected String assignClass(String className) {

    60         return className + " = ";

    61     }

    63     /**

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

    65      *

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

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

    68      *

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

    70      */

    72     public String compile(InputStream classFile) throws IOException {

    73         this.jc = new ClassData(classFile);

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

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

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

    77             "resource", "processByteCode"

    78         );

    79         if (arr != null) {

    80             requireScript(arr[0]);

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

    82                 return null;

    83             }

    84         }

    85         StringArray toInitilize = new StringArray();

    86         final String className = className(jc);

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

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

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

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

    91             if (v.isStatic()) {

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

    93             }

    94         }

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

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

    97         if (sc != null) {

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

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

   100         } else {

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

   102         }

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

   104             if (m.isStatic()) {

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

   106             } else {

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

   108             }

   109         }

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

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

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

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

   114         }

   115         out.append("\n    CLS.$class = java_lang_Class(true);");

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

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

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

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

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

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

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

   123             if (!v.isStatic()) {

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

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

   126             }

   127         }

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

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

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

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

   132         StringBuilder sb = new StringBuilder();

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

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

   135         }

   136         return sb.toString();

   137     }

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

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

   140             return;

   141         }

   142         StringBuilder argsCnt = new StringBuilder();

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

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

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

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

   147         }

   148         out.append('(');

   149         String space = "";

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

   151             out.append(space);

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

   153             space = ",";

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

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

   156                 index += 2;

   157             } else {

   158                 index++;

   159             }

   160         }

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

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

   163         if (code != null) {

   164             int len = m.getMaxLocals();

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

   166                 out.append("  var ");

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

   168             }

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

   170             produceCode(code);

   171         } else {

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

   173         }

   174         out.append("};");

   175     }

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

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

   179             return;

   180         }

   181         StringBuilder argsCnt = new StringBuilder();

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

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

   184         out.append("(arg0");

   185         String space = ",";

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

   187             out.append(space);

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

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

   190                 index += 2;

   191             } else {

   192                 index++;

   193             }

   194         }

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

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

   197         if (code != null) {

   198             int len = m.getMaxLocals();

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

   200                 out.append("  var ");

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

   202             }

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

   204             produceCode(code);

   205         } else {

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

   207         }

   208         out.append("};");

   209     }

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

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

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

   214             int prev = i;

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

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

   217             switch (c) {

   218                 case opc_aload_0:

   219                 case opc_iload_0:

   220                 case opc_lload_0:

   221                 case opc_fload_0:

   222                 case opc_dload_0:

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

   224                     break;

   225                 case opc_aload_1:

   226                 case opc_iload_1:

   227                 case opc_lload_1:

   228                 case opc_fload_1:

   229                 case opc_dload_1:

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

   231                     break;

   232                 case opc_aload_2:

   233                 case opc_iload_2:

   234                 case opc_lload_2:

   235                 case opc_fload_2:

   236                 case opc_dload_2:

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

   238                     break;

   239                 case opc_aload_3:

   240                 case opc_iload_3:

   241                 case opc_lload_3:

   242                 case opc_fload_3:

   243                 case opc_dload_3:

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

   245                     break;

   246                 case opc_iload:

   247                 case opc_lload:

   248                 case opc_fload:

   249                 case opc_dload:

   250                 case opc_aload: {

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

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

   253                     break;

   254                 }

   255                 case opc_istore:

   256                 case opc_lstore:

   257                 case opc_fstore:

   258                 case opc_dstore:

   259                 case opc_astore: {

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

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

   262                     break;

   263                 }

   264                 case opc_astore_0:

   265                 case opc_istore_0:

   266                 case opc_lstore_0:

   267                 case opc_fstore_0:

   268                 case opc_dstore_0:

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

   270                     break;

   271                 case opc_astore_1:

   272                 case opc_istore_1:

   273                 case opc_lstore_1:

   274                 case opc_fstore_1:

   275                 case opc_dstore_1:

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

   277                     break;

   278                 case opc_astore_2:

   279                 case opc_istore_2:

   280                 case opc_lstore_2:

   281                 case opc_fstore_2:

   282                 case opc_dstore_2:

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

   284                     break;

   285                 case opc_astore_3:

   286                 case opc_istore_3:

   287                 case opc_lstore_3:

   288                 case opc_fstore_3:

   289                 case opc_dstore_3:

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

   291                     break;

   292                 case opc_iadd:

   293                 case opc_ladd:

   294                 case opc_fadd:

   295                 case opc_dadd:

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

   297                     break;

   298                 case opc_isub:

   299                 case opc_lsub:

   300                 case opc_fsub:

   301                 case opc_dsub:

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

   303                     break;

   304                 case opc_imul:

   305                 case opc_lmul:

   306                 case opc_fmul:

   307                 case opc_dmul:

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

   309                     break;

   310                 case opc_idiv:

   311                 case opc_ldiv:

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

   313                     break;

   314                 case opc_fdiv:

   315                 case opc_ddiv:

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

   317                     break;

   318                 case opc_irem:

   319                 case opc_lrem:

   320                 case opc_frem:

   321                 case opc_drem:

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

   323                     break;

   324                 case opc_iand:

   325                 case opc_land:

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

   327                     break;

   328                 case opc_ior:

   329                 case opc_lor:

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

   331                     break;

   332                 case opc_ixor:

   333                 case opc_lxor:

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

   335                     break;

   336                 case opc_ineg:

   337                 case opc_lneg:

   338                 case opc_fneg:

   339                 case opc_dneg:

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

   341                     break;

   342                 case opc_ishl:

   343                 case opc_lshl:

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

   345                     break;

   346                 case opc_ishr:

   347                 case opc_lshr:

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

   349                     break;

   350                 case opc_iushr:

   351                 case opc_lushr:

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

   353                     break;

   354                 case opc_iinc: {

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

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

   357                     if (incrBy == 1) {

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

   359                     } else {

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

   361                     }

   362                     break;

   363                 }

   364                 case opc_return:

   365                     out.append("return;");

   366                     break;

   367                 case opc_ireturn:

   368                 case opc_lreturn:

   369                 case opc_freturn:

   370                 case opc_dreturn:

   371                 case opc_areturn:

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

   373                     break;

   374                 case opc_i2l:

   375                 case opc_i2f:

   376                 case opc_i2d:

   377                 case opc_l2i:

   378                     // max int check?

   379                 case opc_l2f:

   380                 case opc_l2d:

   381                 case opc_f2d:

   382                 case opc_d2f:

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

   384                     break;

   385                 case opc_f2i:

   386                 case opc_f2l:

   387                 case opc_d2i:

   388                 case opc_d2l:

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

   390                     break;

   391                 case opc_i2b:

   392                 case opc_i2c:

   393                 case opc_i2s:

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

   395                     break;

   396                 case opc_aconst_null:

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

   398                     break;

   399                 case opc_iconst_m1:

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

   401                     break;

   402                 case opc_iconst_0:

   403                 case opc_dconst_0:

   404                 case opc_lconst_0:

   405                 case opc_fconst_0:

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

   407                     break;

   408                 case opc_iconst_1:

   409                 case opc_lconst_1:

   410                 case opc_fconst_1:

   411                 case opc_dconst_1:

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

   413                     break;

   414                 case opc_iconst_2:

   415                 case opc_fconst_2:

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

   417                     break;

   418                 case opc_iconst_3:

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

   420                     break;

   421                 case opc_iconst_4:

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

   423                     break;

   424                 case opc_iconst_5:

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

   426                     break;

   427                 case opc_ldc: {

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

   429                     String v = encodeConstant(indx);

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

   431                     break;

   432                 }

   433                 case opc_ldc_w:

   434                 case opc_ldc2_w: {

   435                     int indx = readIntArg(byteCodes, i);

   436                     i += 2;

   437                     String v = encodeConstant(indx);

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

   439                     break;

   440                 }

   441                 case opc_lcmp:

   442                 case opc_fcmpl:

   443                 case opc_fcmpg:

   444                 case opc_dcmpl:

   445                 case opc_dcmpg: {

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

   447                     break;

   448                 }

   449                 case opc_if_acmpeq:

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

   451                     break;

   452                 case opc_if_acmpne:

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

   454                     break;

   455                 case opc_if_icmpeq: {

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

   457                     break;

   458                 }

   459                 case opc_ifeq: {

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

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

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

   463                     i += 2;

   464                     break;

   465                 }

   466                 case opc_ifne: {

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

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

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

   470                     i += 2;

   471                     break;

   472                 }

   473                 case opc_iflt: {

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

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

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

   477                     i += 2;

   478                     break;

   479                 }

   480                 case opc_ifle: {

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

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

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

   484                     i += 2;

   485                     break;

   486                 }

   487                 case opc_ifgt: {

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

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

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

   491                     i += 2;

   492                     break;

   493                 }

   494                 case opc_ifge: {

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

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

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

   498                     i += 2;

   499                     break;

   500                 }

   501                 case opc_ifnonnull: {

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

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

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

   505                     i += 2;

   506                     break;

   507                 }

   508                 case opc_ifnull: {

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

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

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

   512                     i += 2;

   513                     break;

   514                 }

   515                 case opc_if_icmpne:

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

   517                     break;

   518                 case opc_if_icmplt:

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

   520                     break;

   521                 case opc_if_icmple:

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

   523                     break;

   524                 case opc_if_icmpgt:

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

   526                     break;

   527                 case opc_if_icmpge:

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

   529                     break;

   530                 case opc_goto: {

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

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

   533                     i += 2;

   534                     break;

   535                 }

   536                 case opc_lookupswitch: {

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

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

   539                     table += 4;

   540                     int n = readInt4(byteCodes, table);

   541                     table += 4;

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

   543                     while (n-- > 0) {

   544                         int cnstnt = readInt4(byteCodes, table);

   545                         table += 4;

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

   547                         table += 4;

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

   549                     }

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

   551                     i = table - 1;

   552                     break;

   553                 }

   554                 case opc_tableswitch: {

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

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

   557                     table += 4;

   558                     int low = readInt4(byteCodes, table);

   559                     table += 4;

   560                     int high = readInt4(byteCodes, table);

   561                     table += 4;

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

   563                     while (low <= high) {

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

   565                         table += 4;

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

   567                         low++;

   568                     }

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

   570                     i = table - 1;

   571                     break;

   572                 }

   573                 case opc_invokeinterface: {

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

   575                     break;

   576                 }

   577                 case opc_invokevirtual:

   578                     i = invokeVirtualMethod(byteCodes, i);

   579                     break;

   580                 case opc_invokespecial:

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

   582                     break;

   583                 case opc_invokestatic:

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

   585                     break;

   586                 case opc_new: {

   587                     int indx = readIntArg(byteCodes, i);

   588                     String ci = jc.getClassName(indx);

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

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

   591                     out.append("());");

   592                     addReference(ci);

   593                     i += 2;

   594                     break;

   595                 }

   596                 case opc_newarray: {

   597                     int type = byteCodes[i++];

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

   599                     break;

   600                 }

   601                 case opc_anewarray: {

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

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

   604                     break;

   605                 }

   606                 case opc_multianewarray: {

   607                     i += 2;

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

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

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

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

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

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

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

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

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

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

   618                             append(";");

   619                     }

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

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

   622                     }

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

   624                     break;

   625                 }

   626                 case opc_arraylength:

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

   628                     break;

   629                 case opc_iastore:

   630                 case opc_lastore:

   631                 case opc_fastore:

   632                 case opc_dastore:

   633                 case opc_aastore:

   634                 case opc_bastore:

   635                 case opc_castore:

   636                 case opc_sastore: {

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

   638                     break;

   639                 }

   640                 case opc_iaload:

   641                 case opc_laload:

   642                 case opc_faload:

   643                 case opc_daload:

   644                 case opc_aaload:

   645                 case opc_baload:

   646                 case opc_caload:

   647                 case opc_saload: {

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

   649                     break;

   650                 }

   651                 case opc_pop2:

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

   653                 case opc_pop:

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

   655                     break;

   656                 case opc_dup:

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

   658                     break;

   659                 case opc_dup_x1:

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

   661                     break;

   662                 case opc_dup_x2:

   663                     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); }");

   664                     break;

   665                 case opc_bipush:

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

   667                     break;

   668                 case opc_sipush:

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

   670                     i += 2;

   671                     break;

   672                 case opc_getfield: {

   673                     int indx = readIntArg(byteCodes, i);

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

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

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

   677                     i += 2;

   678                     break;

   679                 }

   680                 case opc_getstatic: {

   681                     int indx = readIntArg(byteCodes, i);

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

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

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

   685                     i += 2;

   686                     addReference(fi[0]);

   687                     break;

   688                 }

   689                 case opc_putstatic: {

   690                     int indx = readIntArg(byteCodes, i);

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

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

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

   694                     i += 2;

   695                     addReference(fi[0]);

   696                     break;

   697                 }

   698                 case opc_putfield: {

   699                     int indx = readIntArg(byteCodes, i);

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

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

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

   703                     i += 2;

   704                     break;

   705                 }

   706                 case opc_checkcast: {

   707                     int indx = readIntArg(byteCodes, i);

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

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

   710                         // no way to check arrays right now

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

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

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

   714                     }

   715                     i += 2;

   716                     break;

   717                 }

   718                 case opc_instanceof: {

   719                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   724                     i += 2;

   725                     break;

   726                 }

   727                 case opc_athrow: {

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

   729                     break;

   730                 }

   731                 default: {

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

   733                 }

   735             }

   736             out.append(" //");

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

   738                 out.append(" ");

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

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

   741             }

   742             out.append("\n");

   743         }

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

   745     }

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

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

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

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

   751         return i + 2;

   752     }

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

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

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

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

   758     }

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

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

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

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

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

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

   765     }

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

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

   768     }

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

   771         int i = 0;

   772         Boolean count = null;

   773         boolean array = false;

   774         int firstPos = sig.length();

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

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

   777             switch (ch) {

   778                 case '(':

   779                     count = true;

   780                     continue;

   781                 case ')':

   782                     count = false;

   783                     continue;

   784                 case 'A':

   785                     array = true;

   786                     break;

   787                 case 'B':

   788                 case 'C':

   789                 case 'D':

   790                 case 'F':

   791                 case 'I':

   792                 case 'J':

   793                 case 'S':

   794                 case 'Z':

   795                     if (count) {

   796                         if (array) {

   797                             sig.append('A');

   798                         }

   799                         sig.append(ch);

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

   801                             cnt.append('1');

   802                         } else {

   803                             cnt.append('0');

   804                         }

   805                     } else {

   806                         hasReturnType[0] = true;

   807                         sig.insert(firstPos, ch);

   808                         if (array) {

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

   810                         }

   811                     }

   812                     array = false;

   813                     continue;

   814                 case 'V':

   815                     assert !count;

   816                     hasReturnType[0] = false;

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

   818                     continue;

   819                 case 'L':

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

   821                     if (count) {

   822                         if (array) {

   823                             sig.append('A');

   824                         }

   825                         sig.append(ch);

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

   827                         cnt.append('0');

   828                     } else {

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

   830                         sig.insert(firstPos, ch);

   831                         if (array) {

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

   833                         }

   834                         hasReturnType[0] = true;

   835                     }

   836                     i = next + 1;

   837                     continue;

   838                 case '[':

   839                     //arrays++;

   840                     continue;

   841                 default:

   842                     break; // invalid character

   843             }

   844         }

   845     }

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

   848         StringBuilder name = new StringBuilder();

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

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

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

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

   853         } else {

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

   855         }

   857         boolean hasReturn[] = { false };

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

   859         return name.toString();

   860     }

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

   863         StringBuilder name = new StringBuilder();

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

   865         String nm= mi[1];

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

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

   868         } else {

   869             name.append(nm);

   870         }

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

   872         return name.toString();

   873     }

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

   876     throws IOException {

   877         int methodIndex = readIntArg(byteCodes, i);

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

   879         boolean[] hasReturn = { false };

   880         StringBuilder cnt = new StringBuilder();

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

   882         out.append("{ ");

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

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

   885         }

   887         if (hasReturn[0]) {

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

   889         }

   890         final String in = mi[0];

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

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

   893         out.append(mn);

   894         out.append('(');

   895         String sep = "";

   896         if (!isStatic) {

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

   898             sep = ", ";

   899         }

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

   901             out.append(sep);

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

   903             sep = ", ";

   904         }

   905         out.append(")");

   906         if (hasReturn[0]) {

   907             out.append(")");

   908         }

   909         out.append("; }");

   910         i += 2;

   911         addReference(in);

   912         return i;

   913     }

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

   915     throws IOException {

   916         int methodIndex = readIntArg(byteCodes, i);

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

   918         boolean[] hasReturn = { false };

   919         StringBuilder cnt = new StringBuilder();

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

   921         out.append("{ ");

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

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

   924         }

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

   926         if (hasReturn[0]) {

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

   928         }

   929         out.append("self.");

   930         out.append(mn);

   931         out.append('(');

   932         out.append("self");

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

   934             out.append(", ");

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

   936         }

   937         out.append(")");

   938         if (hasReturn[0]) {

   939             out.append(")");

   940         }

   941         out.append("; }");

   942         i += 2;

   943         return i;

   944     }

   946     private void addReference(String cn) throws IOException {

   947         if (requireReference(cn)) {

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

   949         }

   950     }

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

   953         int arr = 0;

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

   955             out.append('A');

   956             d = d.substring(1);

   957         }

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

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

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

   961         } else {

   962             out.append(d);

   963         }

   964     }

   966     private String encodeConstant(int entryIndex) {

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

   968         return s;

   969     }

   971     private String findDescriptor(String d) {

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

   973     }

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

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

   977         if (arr == null) {

   978             return false;

   979         }

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

   981         class P extends AnnotationParser {

   982             int cnt;

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

   984             String body;

   986             @Override

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

   988                 if (type.equals(jvmType)) {

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

   990                         body = value;

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

   992                         args[cnt++] = value;

   993                     } else {

   994                         throw new IllegalArgumentException(attr);

   995                     }

   996                 }

   997             }

   998         }

   999         P p = new P();

  1000         p.parse(arr, jc);

  1001         if (p.body == null) {

  1002             return false;

  1003         }

  1004         StringBuilder cnt = new StringBuilder();

  1005         out.append(prefix).append(findMethodName(m, cnt));

  1006         out.append(" = function(");

  1007         String space;

  1008         int index;

  1009         if (!isStatic) {

  1010             out.append(p.args[0]);

  1011             space = ",";

  1012             index = 1;

  1013         } else {

  1014             space = "";

  1015             index = 0;

  1016         }

  1017         for (int i = 0; i < cnt.length(); i++) {

  1018             out.append(space);

  1019             out.append(p.args[index]);

  1020             index++;

  1021             space = ",";

  1022         }

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

  1024         out.append(p.body);

  1025         out.append("\n}\n");

  1026         return true;

  1027     }

  1028     private static String className(ClassData jc) {

  1029         //return jc.getName().getInternalName().replace('/', '_');

  1030         return jc.getClassName().replace('/', '_');

  1031     }

  1033     private static String[] findAnnotation(

  1034         byte[] arr, ClassData cd, final String className,

  1035         final String... attrNames

  1036     ) throws IOException {

  1037         if (arr == null) {

  1038             return null;

  1039         }

  1040         final String[] values = new String[attrNames.length];

  1041         final boolean[] found = { false };

  1042         final String jvmType = "L" + className.replace('.', '/') + ";";

  1043         AnnotationParser ap = new AnnotationParser() {

  1044             @Override

  1045             protected void visitAttr(String type, String attr, String value) {

  1046                 if (type.equals(jvmType)) {

  1047                     found[0] = true;

  1048                     for (int i = 0; i < attrNames.length; i++) {

  1049                         if (attrNames[i].equals(attr)) {

  1050                             values[i] = value;

  1051                         }

  1052                     }

  1053                 }

  1054             }

  1056         };

  1057         ap.parse(arr, cd);

  1058         return found[0] ? values : null;

  1059     }

  1061     private CharSequence initField(FieldData v) {

  1062         final String is = v.getInternalSig();

  1063         if (is.length() == 1) {

  1064             switch (is.charAt(0)) {

  1065                 case 'S':

  1066                 case 'J':

  1067                 case 'B':

  1068                 case 'Z':

  1069                 case 'C':

  1070                 case 'I': return " = 0;";

  1071                 case 'F':

  1072                 case 'D': return " = 0.0;";

  1073                 default:

  1074                     throw new IllegalStateException(is);

  1075             }

  1076         }

  1077         return " = null;";

  1078     }

  1079 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sat, 01 Dec 2012 12:14:37 +0100
branch	reflection
changeset 227	fae5261c8a9a
parent 225	25e350c6385f
parent 226	907a52ed10e3
child 230	b22dbc9329ec
permissions	-rw-r--r--