hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@bf0a77f029c4

     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         byte[] classAnno = jc.findAnnotationData(false);

   123         if (classAnno != null) {

   124             out.append("\n    CLS.$class.anno = {");

   125             generateAnno(jc, out, classAnno);

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

   127         }

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

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

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

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

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

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

   134             if (!v.isStatic()) {

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

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

   137             }

   138         }

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

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

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

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

   143         StringBuilder sb = new StringBuilder();

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

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

   146         }

   147         return sb.toString();

   148     }

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

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

   151             return;

   152         }

   153         StringBuilder argsCnt = new StringBuilder();

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

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

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

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

   158         }

   159         out.append('(');

   160         String space = "";

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

   162             out.append(space);

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

   164             space = ",";

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

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

   167                 index += 2;

   168             } else {

   169                 index++;

   170             }

   171         }

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

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

   174         if (code != null) {

   175             int len = m.getMaxLocals();

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

   177                 out.append("  var ");

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

   179             }

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

   181             produceCode(code);

   182         } else {

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

   184         }

   185         out.append("};");

   186     }

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

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

   190             return;

   191         }

   192         StringBuilder argsCnt = new StringBuilder();

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

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

   195         out.append("(arg0");

   196         String space = ",";

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

   198             out.append(space);

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

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

   201                 index += 2;

   202             } else {

   203                 index++;

   204             }

   205         }

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

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

   208         if (code != null) {

   209             int len = m.getMaxLocals();

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

   211                 out.append("  var ");

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

   213             }

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

   215             produceCode(code);

   216         } else {

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

   218         }

   219         out.append("};");

   220     }

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

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

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

   225             int prev = i;

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

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

   228             switch (c) {

   229                 case opc_aload_0:

   230                 case opc_iload_0:

   231                 case opc_lload_0:

   232                 case opc_fload_0:

   233                 case opc_dload_0:

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

   235                     break;

   236                 case opc_aload_1:

   237                 case opc_iload_1:

   238                 case opc_lload_1:

   239                 case opc_fload_1:

   240                 case opc_dload_1:

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

   242                     break;

   243                 case opc_aload_2:

   244                 case opc_iload_2:

   245                 case opc_lload_2:

   246                 case opc_fload_2:

   247                 case opc_dload_2:

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

   249                     break;

   250                 case opc_aload_3:

   251                 case opc_iload_3:

   252                 case opc_lload_3:

   253                 case opc_fload_3:

   254                 case opc_dload_3:

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

   256                     break;

   257                 case opc_iload:

   258                 case opc_lload:

   259                 case opc_fload:

   260                 case opc_dload:

   261                 case opc_aload: {

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

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

   264                     break;

   265                 }

   266                 case opc_istore:

   267                 case opc_lstore:

   268                 case opc_fstore:

   269                 case opc_dstore:

   270                 case opc_astore: {

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

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

   273                     break;

   274                 }

   275                 case opc_astore_0:

   276                 case opc_istore_0:

   277                 case opc_lstore_0:

   278                 case opc_fstore_0:

   279                 case opc_dstore_0:

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

   281                     break;

   282                 case opc_astore_1:

   283                 case opc_istore_1:

   284                 case opc_lstore_1:

   285                 case opc_fstore_1:

   286                 case opc_dstore_1:

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

   288                     break;

   289                 case opc_astore_2:

   290                 case opc_istore_2:

   291                 case opc_lstore_2:

   292                 case opc_fstore_2:

   293                 case opc_dstore_2:

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

   295                     break;

   296                 case opc_astore_3:

   297                 case opc_istore_3:

   298                 case opc_lstore_3:

   299                 case opc_fstore_3:

   300                 case opc_dstore_3:

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

   302                     break;

   303                 case opc_iadd:

   304                 case opc_ladd:

   305                 case opc_fadd:

   306                 case opc_dadd:

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

   308                     break;

   309                 case opc_isub:

   310                 case opc_lsub:

   311                 case opc_fsub:

   312                 case opc_dsub:

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

   314                     break;

   315                 case opc_imul:

   316                 case opc_lmul:

   317                 case opc_fmul:

   318                 case opc_dmul:

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

   320                     break;

   321                 case opc_idiv:

   322                 case opc_ldiv:

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

   324                     break;

   325                 case opc_fdiv:

   326                 case opc_ddiv:

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

   328                     break;

   329                 case opc_irem:

   330                 case opc_lrem:

   331                 case opc_frem:

   332                 case opc_drem:

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

   334                     break;

   335                 case opc_iand:

   336                 case opc_land:

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

   338                     break;

   339                 case opc_ior:

   340                 case opc_lor:

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

   342                     break;

   343                 case opc_ixor:

   344                 case opc_lxor:

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

   346                     break;

   347                 case opc_ineg:

   348                 case opc_lneg:

   349                 case opc_fneg:

   350                 case opc_dneg:

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

   352                     break;

   353                 case opc_ishl:

   354                 case opc_lshl:

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

   356                     break;

   357                 case opc_ishr:

   358                 case opc_lshr:

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

   360                     break;

   361                 case opc_iushr:

   362                 case opc_lushr:

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

   364                     break;

   365                 case opc_iinc: {

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

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

   368                     if (incrBy == 1) {

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

   370                     } else {

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

   372                     }

   373                     break;

   374                 }

   375                 case opc_return:

   376                     out.append("return;");

   377                     break;

   378                 case opc_ireturn:

   379                 case opc_lreturn:

   380                 case opc_freturn:

   381                 case opc_dreturn:

   382                 case opc_areturn:

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

   384                     break;

   385                 case opc_i2l:

   386                 case opc_i2f:

   387                 case opc_i2d:

   388                 case opc_l2i:

   389                     // max int check?

   390                 case opc_l2f:

   391                 case opc_l2d:

   392                 case opc_f2d:

   393                 case opc_d2f:

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

   395                     break;

   396                 case opc_f2i:

   397                 case opc_f2l:

   398                 case opc_d2i:

   399                 case opc_d2l:

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

   401                     break;

   402                 case opc_i2b:

   403                 case opc_i2c:

   404                 case opc_i2s:

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

   406                     break;

   407                 case opc_aconst_null:

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

   409                     break;

   410                 case opc_iconst_m1:

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

   412                     break;

   413                 case opc_iconst_0:

   414                 case opc_dconst_0:

   415                 case opc_lconst_0:

   416                 case opc_fconst_0:

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

   418                     break;

   419                 case opc_iconst_1:

   420                 case opc_lconst_1:

   421                 case opc_fconst_1:

   422                 case opc_dconst_1:

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

   424                     break;

   425                 case opc_iconst_2:

   426                 case opc_fconst_2:

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

   428                     break;

   429                 case opc_iconst_3:

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

   431                     break;

   432                 case opc_iconst_4:

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

   434                     break;

   435                 case opc_iconst_5:

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

   437                     break;

   438                 case opc_ldc: {

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

   440                     String v = encodeConstant(indx);

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

   442                     break;

   443                 }

   444                 case opc_ldc_w:

   445                 case opc_ldc2_w: {

   446                     int indx = readIntArg(byteCodes, i);

   447                     i += 2;

   448                     String v = encodeConstant(indx);

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

   450                     break;

   451                 }

   452                 case opc_lcmp:

   453                 case opc_fcmpl:

   454                 case opc_fcmpg:

   455                 case opc_dcmpl:

   456                 case opc_dcmpg: {

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

   458                     break;

   459                 }

   460                 case opc_if_acmpeq:

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

   462                     break;

   463                 case opc_if_acmpne:

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

   465                     break;

   466                 case opc_if_icmpeq: {

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

   468                     break;

   469                 }

   470                 case opc_ifeq: {

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

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

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

   474                     i += 2;

   475                     break;

   476                 }

   477                 case opc_ifne: {

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

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

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

   481                     i += 2;

   482                     break;

   483                 }

   484                 case opc_iflt: {

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

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

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

   488                     i += 2;

   489                     break;

   490                 }

   491                 case opc_ifle: {

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

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

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

   495                     i += 2;

   496                     break;

   497                 }

   498                 case opc_ifgt: {

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

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

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

   502                     i += 2;

   503                     break;

   504                 }

   505                 case opc_ifge: {

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

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

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

   509                     i += 2;

   510                     break;

   511                 }

   512                 case opc_ifnonnull: {

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

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

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

   516                     i += 2;

   517                     break;

   518                 }

   519                 case opc_ifnull: {

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

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

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

   523                     i += 2;

   524                     break;

   525                 }

   526                 case opc_if_icmpne:

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

   528                     break;

   529                 case opc_if_icmplt:

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

   531                     break;

   532                 case opc_if_icmple:

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

   534                     break;

   535                 case opc_if_icmpgt:

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

   537                     break;

   538                 case opc_if_icmpge:

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

   540                     break;

   541                 case opc_goto: {

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

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

   544                     i += 2;

   545                     break;

   546                 }

   547                 case opc_lookupswitch: {

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

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

   550                     table += 4;

   551                     int n = readInt4(byteCodes, table);

   552                     table += 4;

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

   554                     while (n-- > 0) {

   555                         int cnstnt = readInt4(byteCodes, table);

   556                         table += 4;

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

   558                         table += 4;

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

   560                     }

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

   562                     i = table - 1;

   563                     break;

   564                 }

   565                 case opc_tableswitch: {

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

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

   568                     table += 4;

   569                     int low = readInt4(byteCodes, table);

   570                     table += 4;

   571                     int high = readInt4(byteCodes, table);

   572                     table += 4;

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

   574                     while (low <= high) {

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

   576                         table += 4;

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

   578                         low++;

   579                     }

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

   581                     i = table - 1;

   582                     break;

   583                 }

   584                 case opc_invokeinterface: {

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

   586                     break;

   587                 }

   588                 case opc_invokevirtual:

   589                     i = invokeVirtualMethod(byteCodes, i);

   590                     break;

   591                 case opc_invokespecial:

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

   593                     break;

   594                 case opc_invokestatic:

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

   596                     break;

   597                 case opc_new: {

   598                     int indx = readIntArg(byteCodes, i);

   599                     String ci = jc.getClassName(indx);

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

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

   602                     out.append("());");

   603                     addReference(ci);

   604                     i += 2;

   605                     break;

   606                 }

   607                 case opc_newarray: {

   608                     int type = byteCodes[i++];

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

   610                     break;

   611                 }

   612                 case opc_anewarray: {

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

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

   615                     break;

   616                 }

   617                 case opc_multianewarray: {

   618                     i += 2;

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

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

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

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

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

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

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

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

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

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

   629                             append(";");

   630                     }

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

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

   633                     }

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

   635                     break;

   636                 }

   637                 case opc_arraylength:

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

   639                     break;

   640                 case opc_iastore:

   641                 case opc_lastore:

   642                 case opc_fastore:

   643                 case opc_dastore:

   644                 case opc_aastore:

   645                 case opc_bastore:

   646                 case opc_castore:

   647                 case opc_sastore: {

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

   649                     break;

   650                 }

   651                 case opc_iaload:

   652                 case opc_laload:

   653                 case opc_faload:

   654                 case opc_daload:

   655                 case opc_aaload:

   656                 case opc_baload:

   657                 case opc_caload:

   658                 case opc_saload: {

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

   660                     break;

   661                 }

   662                 case opc_pop2:

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

   664                 case opc_pop:

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

   666                     break;

   667                 case opc_dup:

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

   669                     break;

   670                 case opc_dup_x1:

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

   672                     break;

   673                 case opc_dup_x2:

   674                     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); }");

   675                     break;

   676                 case opc_bipush:

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

   678                     break;

   679                 case opc_sipush:

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

   681                     i += 2;

   682                     break;

   683                 case opc_getfield: {

   684                     int indx = readIntArg(byteCodes, i);

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

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

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

   688                     i += 2;

   689                     break;

   690                 }

   691                 case opc_getstatic: {

   692                     int indx = readIntArg(byteCodes, i);

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

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

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

   696                     i += 2;

   697                     addReference(fi[0]);

   698                     break;

   699                 }

   700                 case opc_putstatic: {

   701                     int indx = readIntArg(byteCodes, i);

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

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

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

   705                     i += 2;

   706                     addReference(fi[0]);

   707                     break;

   708                 }

   709                 case opc_putfield: {

   710                     int indx = readIntArg(byteCodes, i);

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

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

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

   714                     i += 2;

   715                     break;

   716                 }

   717                 case opc_checkcast: {

   718                     int indx = readIntArg(byteCodes, i);

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

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

   721                         // no way to check arrays right now

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

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

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

   725                     }

   726                     i += 2;

   727                     break;

   728                 }

   729                 case opc_instanceof: {

   730                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   735                     i += 2;

   736                     break;

   737                 }

   738                 case opc_athrow: {

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

   740                     break;

   741                 }

   742                 default: {

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

   744                 }

   746             }

   747             out.append(" //");

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

   749                 out.append(" ");

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

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

   752             }

   753             out.append("\n");

   754         }

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

   756     }

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

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

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

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

   762         return i + 2;

   763     }

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

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

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

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

   769     }

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

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

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

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

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

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

   776     }

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

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

   779     }

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

   782         int i = 0;

   783         Boolean count = null;

   784         boolean array = false;

   785         int firstPos = sig.length();

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

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

   788             switch (ch) {

   789                 case '(':

   790                     count = true;

   791                     continue;

   792                 case ')':

   793                     count = false;

   794                     continue;

   795                 case 'A':

   796                     array = true;

   797                     break;

   798                 case 'B':

   799                 case 'C':

   800                 case 'D':

   801                 case 'F':

   802                 case 'I':

   803                 case 'J':

   804                 case 'S':

   805                 case 'Z':

   806                     if (count) {

   807                         if (array) {

   808                             sig.append('A');

   809                         }

   810                         sig.append(ch);

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

   812                             cnt.append('1');

   813                         } else {

   814                             cnt.append('0');

   815                         }

   816                     } else {

   817                         hasReturnType[0] = true;

   818                         sig.insert(firstPos, ch);

   819                         if (array) {

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

   821                         }

   822                     }

   823                     array = false;

   824                     continue;

   825                 case 'V':

   826                     assert !count;

   827                     hasReturnType[0] = false;

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

   829                     continue;

   830                 case 'L':

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

   832                     if (count) {

   833                         if (array) {

   834                             sig.append('A');

   835                         }

   836                         sig.append(ch);

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

   838                         cnt.append('0');

   839                     } else {

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

   841                         sig.insert(firstPos, ch);

   842                         if (array) {

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

   844                         }

   845                         hasReturnType[0] = true;

   846                     }

   847                     i = next + 1;

   848                     continue;

   849                 case '[':

   850                     //arrays++;

   851                     continue;

   852                 default:

   853                     break; // invalid character

   854             }

   855         }

   856     }

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

   859         StringBuilder name = new StringBuilder();

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

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

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

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

   864         } else {

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

   866         }

   868         boolean hasReturn[] = { false };

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

   870         return name.toString();

   871     }

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

   874         StringBuilder name = new StringBuilder();

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

   876         String nm= mi[1];

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

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

   879         } else {

   880             name.append(nm);

   881         }

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

   883         return name.toString();

   884     }

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

   887     throws IOException {

   888         int methodIndex = readIntArg(byteCodes, i);

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

   890         boolean[] hasReturn = { false };

   891         StringBuilder cnt = new StringBuilder();

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

   893         out.append("{ ");

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

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

   896         }

   898         if (hasReturn[0]) {

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

   900         }

   901         final String in = mi[0];

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

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

   904         out.append(mn);

   905         out.append('(');

   906         String sep = "";

   907         if (!isStatic) {

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

   909             sep = ", ";

   910         }

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

   912             out.append(sep);

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

   914             sep = ", ";

   915         }

   916         out.append(")");

   917         if (hasReturn[0]) {

   918             out.append(")");

   919         }

   920         out.append("; }");

   921         i += 2;

   922         addReference(in);

   923         return i;

   924     }

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

   926     throws IOException {

   927         int methodIndex = readIntArg(byteCodes, i);

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

   929         boolean[] hasReturn = { false };

   930         StringBuilder cnt = new StringBuilder();

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

   932         out.append("{ ");

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

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

   935         }

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

   937         if (hasReturn[0]) {

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

   939         }

   940         out.append("self.");

   941         out.append(mn);

   942         out.append('(');

   943         out.append("self");

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

   945             out.append(", ");

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

   947         }

   948         out.append(")");

   949         if (hasReturn[0]) {

   950             out.append(")");

   951         }

   952         out.append("; }");

   953         i += 2;

   954         return i;

   955     }

   957     private void addReference(String cn) throws IOException {

   958         if (requireReference(cn)) {

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

   960         }

   961     }

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

   964         int arr = 0;

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

   966             out.append('A');

   967             d = d.substring(1);

   968         }

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

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

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

   972         } else {

   973             out.append(d);

   974         }

   975     }

   977     private String encodeConstant(int entryIndex) throws IOException {

   978         String[] classRef = { null };

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

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

   981             addReference(classRef[0]);

   982         }

   983         return s;

   984     }

   986     private String findDescriptor(String d) {

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

   988     }

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

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

   992         if (arr == null) {

   993             return false;

   994         }

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

   996         class P extends AnnotationParser {

   997             int cnt;

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

   999             String body;

  1001             @Override

  1002             protected void visitAttr(String type, String attr, String value) {

  1003                 if (type.equals(jvmType)) {

  1004                     if ("body".equals(attr)) {

  1005                         body = value;

  1006                     } else if ("args".equals(attr)) {

  1007                         args[cnt++] = value;

  1008                     } else {

  1009                         throw new IllegalArgumentException(attr);

  1010                     }

  1011                 }

  1012             }

  1013         }

  1014         P p = new P();

  1015         p.parse(arr, jc);

  1016         if (p.body == null) {

  1017             return false;

  1018         }

  1019         StringBuilder cnt = new StringBuilder();

  1020         out.append(prefix).append(findMethodName(m, cnt));

  1021         out.append(" = function(");

  1022         String space;

  1023         int index;

  1024         if (!isStatic) {

  1025             out.append(p.args[0]);

  1026             space = ",";

  1027             index = 1;

  1028         } else {

  1029             space = "";

  1030             index = 0;

  1031         }

  1032         for (int i = 0; i < cnt.length(); i++) {

  1033             out.append(space);

  1034             out.append(p.args[index]);

  1035             index++;

  1036             space = ",";

  1037         }

  1038         out.append(") {").append("\n");

  1039         out.append(p.body);

  1040         out.append("\n}\n");

  1041         return true;

  1042     }

  1043     private static String className(ClassData jc) {

  1044         //return jc.getName().getInternalName().replace('/', '_');

  1045         return jc.getClassName().replace('/', '_');

  1046     }

  1048     private static String[] findAnnotation(

  1049         byte[] arr, ClassData cd, final String className,

  1050         final String... attrNames

  1051     ) throws IOException {

  1052         if (arr == null) {

  1053             return null;

  1054         }

  1055         final String[] values = new String[attrNames.length];

  1056         final boolean[] found = { false };

  1057         final String jvmType = "L" + className.replace('.', '/') + ";";

  1058         AnnotationParser ap = new AnnotationParser() {

  1059             @Override

  1060             protected void visitAttr(String type, String attr, String value) {

  1061                 if (type.equals(jvmType)) {

  1062                     found[0] = true;

  1063                     for (int i = 0; i < attrNames.length; i++) {

  1064                         if (attrNames[i].equals(attr)) {

  1065                             values[i] = value;

  1066                         }

  1067                     }

  1068                 }

  1069             }

  1071         };

  1072         ap.parse(arr, cd);

  1073         return found[0] ? values : null;

  1074     }

  1076     private CharSequence initField(FieldData v) {

  1077         final String is = v.getInternalSig();

  1078         if (is.length() == 1) {

  1079             switch (is.charAt(0)) {

  1080                 case 'S':

  1081                 case 'J':

  1082                 case 'B':

  1083                 case 'Z':

  1084                 case 'C':

  1085                 case 'I': return " = 0;";

  1086                 case 'F':

  1087                 case 'D': return " = 0.0;";

  1088                 default:

  1089                     throw new IllegalStateException(is);

  1090             }

  1091         }

  1092         return " = null;";

  1093     }

  1095     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1096         AnnotationParser ap = new AnnotationParser() {

  1097             int cnt;

  1099             @Override

  1100             protected void visitAnnotationStart(String type) throws IOException {

  1101                 out.append('"').append(type).append("\" : {\n");

  1102                 cnt = 0;

  1103             }

  1105             @Override

  1106             protected void visitAnnotationEnd(String type) throws IOException {

  1107                 out.append("\n}\n");

  1108             }

  1110             @Override

  1111             protected void visitAttr(String type, String attr, String value)

  1112             throws IOException {

  1113                 if (cnt++ > 0) {

  1114                     out.append(",\n");

  1115                 }

  1116                 out.append(attr).append(" : ").append(value);

  1117             }

  1118         };

  1119         ap.parse(data, cd);

  1120     }

  1121 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sun, 02 Dec 2012 12:26:14 +0100
branch	reflection
changeset 235	bf0a77f029c4
parent 233	5e8f219d60ba
child 236	d97770281580
permissions	-rw-r--r--