hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@dde8422fb5ae

     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 pp = ").

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

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

   101             out.append("\n    var sprcls = pp.constructor.$class;");

   102         } else {

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

   104             out.append("\n    var sprcls = null;");

   105         }

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

   107             if (m.isStatic()) {

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

   109             } else {

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

   111             }

   112         }

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

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

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

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

   117         }

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

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

   120         out.append("\n    CLS.$class.superclass = sprcls;");

   121         out.append("\n    CLS.$class.cnstr = CLS;");

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

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

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

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

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

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

   128             if (!v.isStatic()) {

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

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

   131             }

   132         }

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

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

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

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

   137         StringBuilder sb = new StringBuilder();

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

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

   140         }

   141         return sb.toString();

   142     }

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

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

   145             return;

   146         }

   147         StringBuilder argsCnt = new StringBuilder();

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

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

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

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

   152         }

   153         out.append('(');

   154         String space = "";

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

   156             out.append(space);

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

   158             space = ",";

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

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

   161                 index += 2;

   162             } else {

   163                 index++;

   164             }

   165         }

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

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

   168         if (code != null) {

   169             int len = m.getMaxLocals();

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

   171                 out.append("  var ");

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

   173             }

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

   175             produceCode(code);

   176         } else {

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

   178         }

   179         out.append("};");

   180     }

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

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

   184             return;

   185         }

   186         StringBuilder argsCnt = new StringBuilder();

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

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

   189         out.append("(arg0");

   190         String space = ",";

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

   192             out.append(space);

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

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

   195                 index += 2;

   196             } else {

   197                 index++;

   198             }

   199         }

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

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

   202         if (code != null) {

   203             int len = m.getMaxLocals();

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

   205                 out.append("  var ");

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

   207             }

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

   209             produceCode(code);

   210         } else {

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

   212         }

   213         out.append("};");

   214     }

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

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

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

   219             int prev = i;

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

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

   222             switch (c) {

   223                 case opc_aload_0:

   224                 case opc_iload_0:

   225                 case opc_lload_0:

   226                 case opc_fload_0:

   227                 case opc_dload_0:

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

   229                     break;

   230                 case opc_aload_1:

   231                 case opc_iload_1:

   232                 case opc_lload_1:

   233                 case opc_fload_1:

   234                 case opc_dload_1:

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

   236                     break;

   237                 case opc_aload_2:

   238                 case opc_iload_2:

   239                 case opc_lload_2:

   240                 case opc_fload_2:

   241                 case opc_dload_2:

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

   243                     break;

   244                 case opc_aload_3:

   245                 case opc_iload_3:

   246                 case opc_lload_3:

   247                 case opc_fload_3:

   248                 case opc_dload_3:

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

   250                     break;

   251                 case opc_iload:

   252                 case opc_lload:

   253                 case opc_fload:

   254                 case opc_dload:

   255                 case opc_aload: {

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

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

   258                     break;

   259                 }

   260                 case opc_istore:

   261                 case opc_lstore:

   262                 case opc_fstore:

   263                 case opc_dstore:

   264                 case opc_astore: {

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

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

   267                     break;

   268                 }

   269                 case opc_astore_0:

   270                 case opc_istore_0:

   271                 case opc_lstore_0:

   272                 case opc_fstore_0:

   273                 case opc_dstore_0:

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

   275                     break;

   276                 case opc_astore_1:

   277                 case opc_istore_1:

   278                 case opc_lstore_1:

   279                 case opc_fstore_1:

   280                 case opc_dstore_1:

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

   282                     break;

   283                 case opc_astore_2:

   284                 case opc_istore_2:

   285                 case opc_lstore_2:

   286                 case opc_fstore_2:

   287                 case opc_dstore_2:

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

   289                     break;

   290                 case opc_astore_3:

   291                 case opc_istore_3:

   292                 case opc_lstore_3:

   293                 case opc_fstore_3:

   294                 case opc_dstore_3:

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

   296                     break;

   297                 case opc_iadd:

   298                 case opc_ladd:

   299                 case opc_fadd:

   300                 case opc_dadd:

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

   302                     break;

   303                 case opc_isub:

   304                 case opc_lsub:

   305                 case opc_fsub:

   306                 case opc_dsub:

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

   308                     break;

   309                 case opc_imul:

   310                 case opc_lmul:

   311                 case opc_fmul:

   312                 case opc_dmul:

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

   314                     break;

   315                 case opc_idiv:

   316                 case opc_ldiv:

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

   318                     break;

   319                 case opc_fdiv:

   320                 case opc_ddiv:

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

   322                     break;

   323                 case opc_irem:

   324                 case opc_lrem:

   325                 case opc_frem:

   326                 case opc_drem:

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

   328                     break;

   329                 case opc_iand:

   330                 case opc_land:

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

   332                     break;

   333                 case opc_ior:

   334                 case opc_lor:

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

   336                     break;

   337                 case opc_ixor:

   338                 case opc_lxor:

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

   340                     break;

   341                 case opc_ineg:

   342                 case opc_lneg:

   343                 case opc_fneg:

   344                 case opc_dneg:

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

   346                     break;

   347                 case opc_ishl:

   348                 case opc_lshl:

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

   350                     break;

   351                 case opc_ishr:

   352                 case opc_lshr:

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

   354                     break;

   355                 case opc_iushr:

   356                 case opc_lushr:

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

   358                     break;

   359                 case opc_iinc: {

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

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

   362                     if (incrBy == 1) {

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

   364                     } else {

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

   366                     }

   367                     break;

   368                 }

   369                 case opc_return:

   370                     out.append("return;");

   371                     break;

   372                 case opc_ireturn:

   373                 case opc_lreturn:

   374                 case opc_freturn:

   375                 case opc_dreturn:

   376                 case opc_areturn:

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

   378                     break;

   379                 case opc_i2l:

   380                 case opc_i2f:

   381                 case opc_i2d:

   382                 case opc_l2i:

   383                     // max int check?

   384                 case opc_l2f:

   385                 case opc_l2d:

   386                 case opc_f2d:

   387                 case opc_d2f:

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

   389                     break;

   390                 case opc_f2i:

   391                 case opc_f2l:

   392                 case opc_d2i:

   393                 case opc_d2l:

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

   395                     break;

   396                 case opc_i2b:

   397                 case opc_i2c:

   398                 case opc_i2s:

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

   400                     break;

   401                 case opc_aconst_null:

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

   403                     break;

   404                 case opc_iconst_m1:

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

   406                     break;

   407                 case opc_iconst_0:

   408                 case opc_dconst_0:

   409                 case opc_lconst_0:

   410                 case opc_fconst_0:

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

   412                     break;

   413                 case opc_iconst_1:

   414                 case opc_lconst_1:

   415                 case opc_fconst_1:

   416                 case opc_dconst_1:

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

   418                     break;

   419                 case opc_iconst_2:

   420                 case opc_fconst_2:

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

   422                     break;

   423                 case opc_iconst_3:

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

   425                     break;

   426                 case opc_iconst_4:

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

   428                     break;

   429                 case opc_iconst_5:

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

   431                     break;

   432                 case opc_ldc: {

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

   434                     String v = encodeConstant(indx);

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

   436                     break;

   437                 }

   438                 case opc_ldc_w:

   439                 case opc_ldc2_w: {

   440                     int indx = readIntArg(byteCodes, i);

   441                     i += 2;

   442                     String v = encodeConstant(indx);

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

   444                     break;

   445                 }

   446                 case opc_lcmp:

   447                 case opc_fcmpl:

   448                 case opc_fcmpg:

   449                 case opc_dcmpl:

   450                 case opc_dcmpg: {

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

   452                     break;

   453                 }

   454                 case opc_if_acmpeq:

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

   456                     break;

   457                 case opc_if_acmpne:

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

   459                     break;

   460                 case opc_if_icmpeq: {

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

   462                     break;

   463                 }

   464                 case opc_ifeq: {

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

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

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

   468                     i += 2;

   469                     break;

   470                 }

   471                 case opc_ifne: {

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

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

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

   475                     i += 2;

   476                     break;

   477                 }

   478                 case opc_iflt: {

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

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

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

   482                     i += 2;

   483                     break;

   484                 }

   485                 case opc_ifle: {

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

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

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

   489                     i += 2;

   490                     break;

   491                 }

   492                 case opc_ifgt: {

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

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

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

   496                     i += 2;

   497                     break;

   498                 }

   499                 case opc_ifge: {

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

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

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

   503                     i += 2;

   504                     break;

   505                 }

   506                 case opc_ifnonnull: {

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

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

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

   510                     i += 2;

   511                     break;

   512                 }

   513                 case opc_ifnull: {

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

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

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

   517                     i += 2;

   518                     break;

   519                 }

   520                 case opc_if_icmpne:

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

   522                     break;

   523                 case opc_if_icmplt:

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

   525                     break;

   526                 case opc_if_icmple:

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

   528                     break;

   529                 case opc_if_icmpgt:

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

   531                     break;

   532                 case opc_if_icmpge:

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

   534                     break;

   535                 case opc_goto: {

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

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

   538                     i += 2;

   539                     break;

   540                 }

   541                 case opc_lookupswitch: {

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

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

   544                     table += 4;

   545                     int n = readInt4(byteCodes, table);

   546                     table += 4;

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

   548                     while (n-- > 0) {

   549                         int cnstnt = readInt4(byteCodes, table);

   550                         table += 4;

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

   552                         table += 4;

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

   554                     }

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

   556                     i = table - 1;

   557                     break;

   558                 }

   559                 case opc_tableswitch: {

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

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

   562                     table += 4;

   563                     int low = readInt4(byteCodes, table);

   564                     table += 4;

   565                     int high = readInt4(byteCodes, table);

   566                     table += 4;

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

   568                     while (low <= high) {

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

   570                         table += 4;

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

   572                         low++;

   573                     }

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

   575                     i = table - 1;

   576                     break;

   577                 }

   578                 case opc_invokeinterface: {

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

   580                     break;

   581                 }

   582                 case opc_invokevirtual:

   583                     i = invokeVirtualMethod(byteCodes, i);

   584                     break;

   585                 case opc_invokespecial:

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

   587                     break;

   588                 case opc_invokestatic:

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

   590                     break;

   591                 case opc_new: {

   592                     int indx = readIntArg(byteCodes, i);

   593                     String ci = jc.getClassName(indx);

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

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

   596                     out.append("());");

   597                     addReference(ci);

   598                     i += 2;

   599                     break;

   600                 }

   601                 case opc_newarray: {

   602                     int type = byteCodes[i++];

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

   604                     break;

   605                 }

   606                 case opc_anewarray: {

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

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

   609                     break;

   610                 }

   611                 case opc_multianewarray: {

   612                     i += 2;

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

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

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

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

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

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

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

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

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

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

   623                             append(";");

   624                     }

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

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

   627                     }

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

   629                     break;

   630                 }

   631                 case opc_arraylength:

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

   633                     break;

   634                 case opc_iastore:

   635                 case opc_lastore:

   636                 case opc_fastore:

   637                 case opc_dastore:

   638                 case opc_aastore:

   639                 case opc_bastore:

   640                 case opc_castore:

   641                 case opc_sastore: {

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

   643                     break;

   644                 }

   645                 case opc_iaload:

   646                 case opc_laload:

   647                 case opc_faload:

   648                 case opc_daload:

   649                 case opc_aaload:

   650                 case opc_baload:

   651                 case opc_caload:

   652                 case opc_saload: {

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

   654                     break;

   655                 }

   656                 case opc_pop2:

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

   658                 case opc_pop:

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

   660                     break;

   661                 case opc_dup:

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

   663                     break;

   664                 case opc_dup_x1:

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

   666                     break;

   667                 case opc_dup_x2:

   668                     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); }");

   669                     break;

   670                 case opc_bipush:

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

   672                     break;

   673                 case opc_sipush:

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

   675                     i += 2;

   676                     break;

   677                 case opc_getfield: {

   678                     int indx = readIntArg(byteCodes, i);

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

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

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

   682                     i += 2;

   683                     break;

   684                 }

   685                 case opc_getstatic: {

   686                     int indx = readIntArg(byteCodes, i);

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

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

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

   690                     i += 2;

   691                     addReference(fi[0]);

   692                     break;

   693                 }

   694                 case opc_putstatic: {

   695                     int indx = readIntArg(byteCodes, i);

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

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

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

   699                     i += 2;

   700                     addReference(fi[0]);

   701                     break;

   702                 }

   703                 case opc_putfield: {

   704                     int indx = readIntArg(byteCodes, i);

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

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

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

   708                     i += 2;

   709                     break;

   710                 }

   711                 case opc_checkcast: {

   712                     int indx = readIntArg(byteCodes, i);

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

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

   715                         // no way to check arrays right now

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

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

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

   719                     }

   720                     i += 2;

   721                     break;

   722                 }

   723                 case opc_instanceof: {

   724                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   729                     i += 2;

   730                     break;

   731                 }

   732                 case opc_athrow: {

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

   734                     break;

   735                 }

   736                 default: {

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

   738                 }

   740             }

   741             out.append(" //");

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

   743                 out.append(" ");

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

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

   746             }

   747             out.append("\n");

   748         }

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

   750     }

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

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

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

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

   756         return i + 2;

   757     }

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

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

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

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

   763     }

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

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

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

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

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

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

   770     }

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

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

   773     }

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

   776         int i = 0;

   777         Boolean count = null;

   778         boolean array = false;

   779         int firstPos = sig.length();

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

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

   782             switch (ch) {

   783                 case '(':

   784                     count = true;

   785                     continue;

   786                 case ')':

   787                     count = false;

   788                     continue;

   789                 case 'A':

   790                     array = true;

   791                     break;

   792                 case 'B':

   793                 case 'C':

   794                 case 'D':

   795                 case 'F':

   796                 case 'I':

   797                 case 'J':

   798                 case 'S':

   799                 case 'Z':

   800                     if (count) {

   801                         if (array) {

   802                             sig.append('A');

   803                         }

   804                         sig.append(ch);

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

   806                             cnt.append('1');

   807                         } else {

   808                             cnt.append('0');

   809                         }

   810                     } else {

   811                         hasReturnType[0] = true;

   812                         sig.insert(firstPos, ch);

   813                         if (array) {

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

   815                         }

   816                     }

   817                     array = false;

   818                     continue;

   819                 case 'V':

   820                     assert !count;

   821                     hasReturnType[0] = false;

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

   823                     continue;

   824                 case 'L':

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

   826                     if (count) {

   827                         if (array) {

   828                             sig.append('A');

   829                         }

   830                         sig.append(ch);

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

   832                         cnt.append('0');

   833                     } else {

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

   835                         sig.insert(firstPos, ch);

   836                         if (array) {

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

   838                         }

   839                         hasReturnType[0] = true;

   840                     }

   841                     i = next + 1;

   842                     continue;

   843                 case '[':

   844                     //arrays++;

   845                     continue;

   846                 default:

   847                     break; // invalid character

   848             }

   849         }

   850     }

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

   853         StringBuilder name = new StringBuilder();

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

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

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

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

   858         } else {

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

   860         }

   862         boolean hasReturn[] = { false };

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

   864         return name.toString();

   865     }

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

   868         StringBuilder name = new StringBuilder();

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

   870         String nm= mi[1];

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

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

   873         } else {

   874             name.append(nm);

   875         }

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

   877         return name.toString();

   878     }

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

   881     throws IOException {

   882         int methodIndex = readIntArg(byteCodes, i);

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

   884         boolean[] hasReturn = { false };

   885         StringBuilder cnt = new StringBuilder();

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

   887         out.append("{ ");

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

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

   890         }

   892         if (hasReturn[0]) {

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

   894         }

   895         final String in = mi[0];

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

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

   898         out.append(mn);

   899         out.append('(');

   900         String sep = "";

   901         if (!isStatic) {

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

   903             sep = ", ";

   904         }

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

   906             out.append(sep);

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

   908             sep = ", ";

   909         }

   910         out.append(")");

   911         if (hasReturn[0]) {

   912             out.append(")");

   913         }

   914         out.append("; }");

   915         i += 2;

   916         addReference(in);

   917         return i;

   918     }

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

   920     throws IOException {

   921         int methodIndex = readIntArg(byteCodes, i);

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

   923         boolean[] hasReturn = { false };

   924         StringBuilder cnt = new StringBuilder();

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

   926         out.append("{ ");

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

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

   929         }

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

   931         if (hasReturn[0]) {

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

   933         }

   934         out.append("self.");

   935         out.append(mn);

   936         out.append('(');

   937         out.append("self");

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

   939             out.append(", ");

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

   941         }

   942         out.append(")");

   943         if (hasReturn[0]) {

   944             out.append(")");

   945         }

   946         out.append("; }");

   947         i += 2;

   948         return i;

   949     }

   951     private void addReference(String cn) throws IOException {

   952         if (requireReference(cn)) {

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

   954         }

   955     }

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

   958         int arr = 0;

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

   960             out.append('A');

   961             d = d.substring(1);

   962         }

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

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

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

   966         } else {

   967             out.append(d);

   968         }

   969     }

   971     private String encodeConstant(int entryIndex) throws IOException {

   972         String[] classRef = { null };

   973         String s = jc.stringValue(entryIndex, classRef);

   974         if (classRef[0] != null) {

   975             addReference(classRef[0]);

   976         }

   977         return s;

   978     }

   980     private String findDescriptor(String d) {

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

   982     }

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

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

   986         if (arr == null) {

   987             return false;

   988         }

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

   990         class P extends AnnotationParser {

   991             int cnt;

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

   993             String body;

   995             @Override

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

   997                 if (type.equals(jvmType)) {

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

   999                         body = value;

  1000                     } else if ("args".equals(attr)) {

  1001                         args[cnt++] = value;

  1002                     } else {

  1003                         throw new IllegalArgumentException(attr);

  1004                     }

  1005                 }

  1006             }

  1007         }

  1008         P p = new P();

  1009         p.parse(arr, jc);

  1010         if (p.body == null) {

  1011             return false;

  1012         }

  1013         StringBuilder cnt = new StringBuilder();

  1014         out.append(prefix).append(findMethodName(m, cnt));

  1015         out.append(" = function(");

  1016         String space;

  1017         int index;

  1018         if (!isStatic) {

  1019             out.append(p.args[0]);

  1020             space = ",";

  1021             index = 1;

  1022         } else {

  1023             space = "";

  1024             index = 0;

  1025         }

  1026         for (int i = 0; i < cnt.length(); i++) {

  1027             out.append(space);

  1028             out.append(p.args[index]);

  1029             index++;

  1030             space = ",";

  1031         }

  1032         out.append(") {").append("\n");

  1033         out.append(p.body);

  1034         out.append("\n}\n");

  1035         return true;

  1036     }

  1037     private static String className(ClassData jc) {

  1038         //return jc.getName().getInternalName().replace('/', '_');

  1039         return jc.getClassName().replace('/', '_');

  1040     }

  1042     private static String[] findAnnotation(

  1043         byte[] arr, ClassData cd, final String className,

  1044         final String... attrNames

  1045     ) throws IOException {

  1046         if (arr == null) {

  1047             return null;

  1048         }

  1049         final String[] values = new String[attrNames.length];

  1050         final boolean[] found = { false };

  1051         final String jvmType = "L" + className.replace('.', '/') + ";";

  1052         AnnotationParser ap = new AnnotationParser() {

  1053             @Override

  1054             protected void visitAttr(String type, String attr, String value) {

  1055                 if (type.equals(jvmType)) {

  1056                     found[0] = true;

  1057                     for (int i = 0; i < attrNames.length; i++) {

  1058                         if (attrNames[i].equals(attr)) {

  1059                             values[i] = value;

  1060                         }

  1061                     }

  1062                 }

  1063             }

  1065         };

  1066         ap.parse(arr, cd);

  1067         return found[0] ? values : null;

  1068     }

  1070     private CharSequence initField(FieldData v) {

  1071         final String is = v.getInternalSig();

  1072         if (is.length() == 1) {

  1073             switch (is.charAt(0)) {

  1074                 case 'S':

  1075                 case 'J':

  1076                 case 'B':

  1077                 case 'Z':

  1078                 case 'C':

  1079                 case 'I': return " = 0;";

  1080                 case 'F':

  1081                 case 'D': return " = 0.0;";

  1082                 default:

  1083                     throw new IllegalStateException(is);

  1084             }

  1085         }

  1086         return " = null;";

  1087     }

  1088 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sat, 01 Dec 2012 15:48:12 +0100
branch	reflection
changeset 231	dde8422fb5ae
parent 230	b22dbc9329ec
child 233	5e8f219d60ba
permissions	-rw-r--r--