hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@b22dbc9329ec

     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  }");

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

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

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

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

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

   127             if (!v.isStatic()) {

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

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

   130             }

   131         }

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

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

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

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

   136         StringBuilder sb = new StringBuilder();

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

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

   139         }

   140         return sb.toString();

   141     }

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

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

   144             return;

   145         }

   146         StringBuilder argsCnt = new StringBuilder();

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

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

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

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

   151         }

   152         out.append('(');

   153         String space = "";

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

   155             out.append(space);

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

   157             space = ",";

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

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

   160                 index += 2;

   161             } else {

   162                 index++;

   163             }

   164         }

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

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

   167         if (code != null) {

   168             int len = m.getMaxLocals();

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

   170                 out.append("  var ");

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

   172             }

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

   174             produceCode(code);

   175         } else {

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

   177         }

   178         out.append("};");

   179     }

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

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

   183             return;

   184         }

   185         StringBuilder argsCnt = new StringBuilder();

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

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

   188         out.append("(arg0");

   189         String space = ",";

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

   191             out.append(space);

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

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

   194                 index += 2;

   195             } else {

   196                 index++;

   197             }

   198         }

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

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

   201         if (code != null) {

   202             int len = m.getMaxLocals();

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

   204                 out.append("  var ");

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

   206             }

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

   208             produceCode(code);

   209         } else {

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

   211         }

   212         out.append("};");

   213     }

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

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

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

   218             int prev = i;

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

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

   221             switch (c) {

   222                 case opc_aload_0:

   223                 case opc_iload_0:

   224                 case opc_lload_0:

   225                 case opc_fload_0:

   226                 case opc_dload_0:

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

   228                     break;

   229                 case opc_aload_1:

   230                 case opc_iload_1:

   231                 case opc_lload_1:

   232                 case opc_fload_1:

   233                 case opc_dload_1:

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

   235                     break;

   236                 case opc_aload_2:

   237                 case opc_iload_2:

   238                 case opc_lload_2:

   239                 case opc_fload_2:

   240                 case opc_dload_2:

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

   242                     break;

   243                 case opc_aload_3:

   244                 case opc_iload_3:

   245                 case opc_lload_3:

   246                 case opc_fload_3:

   247                 case opc_dload_3:

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

   249                     break;

   250                 case opc_iload:

   251                 case opc_lload:

   252                 case opc_fload:

   253                 case opc_dload:

   254                 case opc_aload: {

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

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

   257                     break;

   258                 }

   259                 case opc_istore:

   260                 case opc_lstore:

   261                 case opc_fstore:

   262                 case opc_dstore:

   263                 case opc_astore: {

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

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

   266                     break;

   267                 }

   268                 case opc_astore_0:

   269                 case opc_istore_0:

   270                 case opc_lstore_0:

   271                 case opc_fstore_0:

   272                 case opc_dstore_0:

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

   274                     break;

   275                 case opc_astore_1:

   276                 case opc_istore_1:

   277                 case opc_lstore_1:

   278                 case opc_fstore_1:

   279                 case opc_dstore_1:

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

   281                     break;

   282                 case opc_astore_2:

   283                 case opc_istore_2:

   284                 case opc_lstore_2:

   285                 case opc_fstore_2:

   286                 case opc_dstore_2:

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

   288                     break;

   289                 case opc_astore_3:

   290                 case opc_istore_3:

   291                 case opc_lstore_3:

   292                 case opc_fstore_3:

   293                 case opc_dstore_3:

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

   295                     break;

   296                 case opc_iadd:

   297                 case opc_ladd:

   298                 case opc_fadd:

   299                 case opc_dadd:

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

   301                     break;

   302                 case opc_isub:

   303                 case opc_lsub:

   304                 case opc_fsub:

   305                 case opc_dsub:

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

   307                     break;

   308                 case opc_imul:

   309                 case opc_lmul:

   310                 case opc_fmul:

   311                 case opc_dmul:

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

   313                     break;

   314                 case opc_idiv:

   315                 case opc_ldiv:

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

   317                     break;

   318                 case opc_fdiv:

   319                 case opc_ddiv:

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

   321                     break;

   322                 case opc_irem:

   323                 case opc_lrem:

   324                 case opc_frem:

   325                 case opc_drem:

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

   327                     break;

   328                 case opc_iand:

   329                 case opc_land:

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

   331                     break;

   332                 case opc_ior:

   333                 case opc_lor:

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

   335                     break;

   336                 case opc_ixor:

   337                 case opc_lxor:

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

   339                     break;

   340                 case opc_ineg:

   341                 case opc_lneg:

   342                 case opc_fneg:

   343                 case opc_dneg:

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

   345                     break;

   346                 case opc_ishl:

   347                 case opc_lshl:

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

   349                     break;

   350                 case opc_ishr:

   351                 case opc_lshr:

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

   353                     break;

   354                 case opc_iushr:

   355                 case opc_lushr:

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

   357                     break;

   358                 case opc_iinc: {

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

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

   361                     if (incrBy == 1) {

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

   363                     } else {

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

   365                     }

   366                     break;

   367                 }

   368                 case opc_return:

   369                     out.append("return;");

   370                     break;

   371                 case opc_ireturn:

   372                 case opc_lreturn:

   373                 case opc_freturn:

   374                 case opc_dreturn:

   375                 case opc_areturn:

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

   377                     break;

   378                 case opc_i2l:

   379                 case opc_i2f:

   380                 case opc_i2d:

   381                 case opc_l2i:

   382                     // max int check?

   383                 case opc_l2f:

   384                 case opc_l2d:

   385                 case opc_f2d:

   386                 case opc_d2f:

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

   388                     break;

   389                 case opc_f2i:

   390                 case opc_f2l:

   391                 case opc_d2i:

   392                 case opc_d2l:

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

   394                     break;

   395                 case opc_i2b:

   396                 case opc_i2c:

   397                 case opc_i2s:

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

   399                     break;

   400                 case opc_aconst_null:

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

   402                     break;

   403                 case opc_iconst_m1:

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

   405                     break;

   406                 case opc_iconst_0:

   407                 case opc_dconst_0:

   408                 case opc_lconst_0:

   409                 case opc_fconst_0:

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

   411                     break;

   412                 case opc_iconst_1:

   413                 case opc_lconst_1:

   414                 case opc_fconst_1:

   415                 case opc_dconst_1:

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

   417                     break;

   418                 case opc_iconst_2:

   419                 case opc_fconst_2:

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

   421                     break;

   422                 case opc_iconst_3:

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

   424                     break;

   425                 case opc_iconst_4:

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

   427                     break;

   428                 case opc_iconst_5:

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

   430                     break;

   431                 case opc_ldc: {

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

   433                     String v = encodeConstant(indx);

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

   435                     break;

   436                 }

   437                 case opc_ldc_w:

   438                 case opc_ldc2_w: {

   439                     int indx = readIntArg(byteCodes, i);

   440                     i += 2;

   441                     String v = encodeConstant(indx);

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

   443                     break;

   444                 }

   445                 case opc_lcmp:

   446                 case opc_fcmpl:

   447                 case opc_fcmpg:

   448                 case opc_dcmpl:

   449                 case opc_dcmpg: {

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

   451                     break;

   452                 }

   453                 case opc_if_acmpeq:

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

   455                     break;

   456                 case opc_if_acmpne:

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

   458                     break;

   459                 case opc_if_icmpeq: {

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

   461                     break;

   462                 }

   463                 case opc_ifeq: {

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

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

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

   467                     i += 2;

   468                     break;

   469                 }

   470                 case opc_ifne: {

   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_iflt: {

   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_ifle: {

   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_ifgt: {

   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_ifge: {

   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_ifnonnull: {

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

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

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

   509                     i += 2;

   510                     break;

   511                 }

   512                 case opc_ifnull: {

   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_if_icmpne:

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

   521                     break;

   522                 case opc_if_icmplt:

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

   524                     break;

   525                 case opc_if_icmple:

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

   527                     break;

   528                 case opc_if_icmpgt:

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

   530                     break;

   531                 case opc_if_icmpge:

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

   533                     break;

   534                 case opc_goto: {

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

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

   537                     i += 2;

   538                     break;

   539                 }

   540                 case opc_lookupswitch: {

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

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

   543                     table += 4;

   544                     int n = readInt4(byteCodes, table);

   545                     table += 4;

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

   547                     while (n-- > 0) {

   548                         int cnstnt = readInt4(byteCodes, table);

   549                         table += 4;

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

   551                         table += 4;

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

   553                     }

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

   555                     i = table - 1;

   556                     break;

   557                 }

   558                 case opc_tableswitch: {

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

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

   561                     table += 4;

   562                     int low = readInt4(byteCodes, table);

   563                     table += 4;

   564                     int high = readInt4(byteCodes, table);

   565                     table += 4;

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

   567                     while (low <= high) {

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

   569                         table += 4;

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

   571                         low++;

   572                     }

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

   574                     i = table - 1;

   575                     break;

   576                 }

   577                 case opc_invokeinterface: {

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

   579                     break;

   580                 }

   581                 case opc_invokevirtual:

   582                     i = invokeVirtualMethod(byteCodes, i);

   583                     break;

   584                 case opc_invokespecial:

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

   586                     break;

   587                 case opc_invokestatic:

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

   589                     break;

   590                 case opc_new: {

   591                     int indx = readIntArg(byteCodes, i);

   592                     String ci = jc.getClassName(indx);

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

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

   595                     out.append("());");

   596                     addReference(ci);

   597                     i += 2;

   598                     break;

   599                 }

   600                 case opc_newarray: {

   601                     int type = byteCodes[i++];

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

   603                     break;

   604                 }

   605                 case opc_anewarray: {

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

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

   608                     break;

   609                 }

   610                 case opc_multianewarray: {

   611                     i += 2;

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

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

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

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

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

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

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

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

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

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

   622                             append(";");

   623                     }

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

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

   626                     }

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

   628                     break;

   629                 }

   630                 case opc_arraylength:

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

   632                     break;

   633                 case opc_iastore:

   634                 case opc_lastore:

   635                 case opc_fastore:

   636                 case opc_dastore:

   637                 case opc_aastore:

   638                 case opc_bastore:

   639                 case opc_castore:

   640                 case opc_sastore: {

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

   642                     break;

   643                 }

   644                 case opc_iaload:

   645                 case opc_laload:

   646                 case opc_faload:

   647                 case opc_daload:

   648                 case opc_aaload:

   649                 case opc_baload:

   650                 case opc_caload:

   651                 case opc_saload: {

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

   653                     break;

   654                 }

   655                 case opc_pop2:

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

   657                 case opc_pop:

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

   659                     break;

   660                 case opc_dup:

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

   662                     break;

   663                 case opc_dup_x1:

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

   665                     break;

   666                 case opc_dup_x2:

   667                     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); }");

   668                     break;

   669                 case opc_bipush:

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

   671                     break;

   672                 case opc_sipush:

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

   674                     i += 2;

   675                     break;

   676                 case opc_getfield: {

   677                     int indx = readIntArg(byteCodes, i);

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

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

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

   681                     i += 2;

   682                     break;

   683                 }

   684                 case opc_getstatic: {

   685                     int indx = readIntArg(byteCodes, i);

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

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

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

   689                     i += 2;

   690                     addReference(fi[0]);

   691                     break;

   692                 }

   693                 case opc_putstatic: {

   694                     int indx = readIntArg(byteCodes, i);

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

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

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

   698                     i += 2;

   699                     addReference(fi[0]);

   700                     break;

   701                 }

   702                 case opc_putfield: {

   703                     int indx = readIntArg(byteCodes, i);

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

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

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

   707                     i += 2;

   708                     break;

   709                 }

   710                 case opc_checkcast: {

   711                     int indx = readIntArg(byteCodes, i);

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

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

   714                         // no way to check arrays right now

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

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

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

   718                     }

   719                     i += 2;

   720                     break;

   721                 }

   722                 case opc_instanceof: {

   723                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   728                     i += 2;

   729                     break;

   730                 }

   731                 case opc_athrow: {

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

   733                     break;

   734                 }

   735                 default: {

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

   737                 }

   739             }

   740             out.append(" //");

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

   742                 out.append(" ");

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

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

   745             }

   746             out.append("\n");

   747         }

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

   749     }

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

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

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

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

   755         return i + 2;

   756     }

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

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

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

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

   762     }

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

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

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

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

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

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

   769     }

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

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

   772     }

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

   775         int i = 0;

   776         Boolean count = null;

   777         boolean array = false;

   778         int firstPos = sig.length();

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

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

   781             switch (ch) {

   782                 case '(':

   783                     count = true;

   784                     continue;

   785                 case ')':

   786                     count = false;

   787                     continue;

   788                 case 'A':

   789                     array = true;

   790                     break;

   791                 case 'B':

   792                 case 'C':

   793                 case 'D':

   794                 case 'F':

   795                 case 'I':

   796                 case 'J':

   797                 case 'S':

   798                 case 'Z':

   799                     if (count) {

   800                         if (array) {

   801                             sig.append('A');

   802                         }

   803                         sig.append(ch);

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

   805                             cnt.append('1');

   806                         } else {

   807                             cnt.append('0');

   808                         }

   809                     } else {

   810                         hasReturnType[0] = true;

   811                         sig.insert(firstPos, ch);

   812                         if (array) {

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

   814                         }

   815                     }

   816                     array = false;

   817                     continue;

   818                 case 'V':

   819                     assert !count;

   820                     hasReturnType[0] = false;

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

   822                     continue;

   823                 case 'L':

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

   825                     if (count) {

   826                         if (array) {

   827                             sig.append('A');

   828                         }

   829                         sig.append(ch);

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

   831                         cnt.append('0');

   832                     } else {

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

   834                         sig.insert(firstPos, ch);

   835                         if (array) {

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

   837                         }

   838                         hasReturnType[0] = true;

   839                     }

   840                     i = next + 1;

   841                     continue;

   842                 case '[':

   843                     //arrays++;

   844                     continue;

   845                 default:

   846                     break; // invalid character

   847             }

   848         }

   849     }

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

   852         StringBuilder name = new StringBuilder();

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

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

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

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

   857         } else {

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

   859         }

   861         boolean hasReturn[] = { false };

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

   863         return name.toString();

   864     }

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

   867         StringBuilder name = new StringBuilder();

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

   869         String nm= mi[1];

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

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

   872         } else {

   873             name.append(nm);

   874         }

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

   876         return name.toString();

   877     }

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

   880     throws IOException {

   881         int methodIndex = readIntArg(byteCodes, i);

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

   883         boolean[] hasReturn = { false };

   884         StringBuilder cnt = new StringBuilder();

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

   886         out.append("{ ");

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

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

   889         }

   891         if (hasReturn[0]) {

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

   893         }

   894         final String in = mi[0];

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

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

   897         out.append(mn);

   898         out.append('(');

   899         String sep = "";

   900         if (!isStatic) {

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

   902             sep = ", ";

   903         }

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

   905             out.append(sep);

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

   907             sep = ", ";

   908         }

   909         out.append(")");

   910         if (hasReturn[0]) {

   911             out.append(")");

   912         }

   913         out.append("; }");

   914         i += 2;

   915         addReference(in);

   916         return i;

   917     }

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

   919     throws IOException {

   920         int methodIndex = readIntArg(byteCodes, i);

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

   922         boolean[] hasReturn = { false };

   923         StringBuilder cnt = new StringBuilder();

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

   925         out.append("{ ");

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

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

   928         }

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

   930         if (hasReturn[0]) {

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

   932         }

   933         out.append("self.");

   934         out.append(mn);

   935         out.append('(');

   936         out.append("self");

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

   938             out.append(", ");

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

   940         }

   941         out.append(")");

   942         if (hasReturn[0]) {

   943             out.append(")");

   944         }

   945         out.append("; }");

   946         i += 2;

   947         return i;

   948     }

   950     private void addReference(String cn) throws IOException {

   951         if (requireReference(cn)) {

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

   953         }

   954     }

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

   957         int arr = 0;

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

   959             out.append('A');

   960             d = d.substring(1);

   961         }

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

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

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

   965         } else {

   966             out.append(d);

   967         }

   968     }

   970     private String encodeConstant(int entryIndex) throws IOException {

   971         String[] classRef = { null };

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

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

   974             addReference(classRef[0]);

   975         }

   976         return s;

   977     }

   979     private String findDescriptor(String d) {

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

   981     }

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

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

   985         if (arr == null) {

   986             return false;

   987         }

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

   989         class P extends AnnotationParser {

   990             int cnt;

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

   992             String body;

   994             @Override

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

   996                 if (type.equals(jvmType)) {

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

   998                         body = value;

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

  1000                         args[cnt++] = value;

  1001                     } else {

  1002                         throw new IllegalArgumentException(attr);

  1003                     }

  1004                 }

  1005             }

  1006         }

  1007         P p = new P();

  1008         p.parse(arr, jc);

  1009         if (p.body == null) {

  1010             return false;

  1011         }

  1012         StringBuilder cnt = new StringBuilder();

  1013         out.append(prefix).append(findMethodName(m, cnt));

  1014         out.append(" = function(");

  1015         String space;

  1016         int index;

  1017         if (!isStatic) {

  1018             out.append(p.args[0]);

  1019             space = ",";

  1020             index = 1;

  1021         } else {

  1022             space = "";

  1023             index = 0;

  1024         }

  1025         for (int i = 0; i < cnt.length(); i++) {

  1026             out.append(space);

  1027             out.append(p.args[index]);

  1028             index++;

  1029             space = ",";

  1030         }

  1031         out.append(") {").append("\n");

  1032         out.append(p.body);

  1033         out.append("\n}\n");

  1034         return true;

  1035     }

  1036     private static String className(ClassData jc) {

  1037         //return jc.getName().getInternalName().replace('/', '_');

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

  1039     }

  1041     private static String[] findAnnotation(

  1042         byte[] arr, ClassData cd, final String className,

  1043         final String... attrNames

  1044     ) throws IOException {

  1045         if (arr == null) {

  1046             return null;

  1047         }

  1048         final String[] values = new String[attrNames.length];

  1049         final boolean[] found = { false };

  1050         final String jvmType = "L" + className.replace('.', '/') + ";";

  1051         AnnotationParser ap = new AnnotationParser() {

  1052             @Override

  1053             protected void visitAttr(String type, String attr, String value) {

  1054                 if (type.equals(jvmType)) {

  1055                     found[0] = true;

  1056                     for (int i = 0; i < attrNames.length; i++) {

  1057                         if (attrNames[i].equals(attr)) {

  1058                             values[i] = value;

  1059                         }

  1060                     }

  1061                 }

  1062             }

  1064         };

  1065         ap.parse(arr, cd);

  1066         return found[0] ? values : null;

  1067     }

  1069     private CharSequence initField(FieldData v) {

  1070         final String is = v.getInternalSig();

  1071         if (is.length() == 1) {

  1072             switch (is.charAt(0)) {

  1073                 case 'S':

  1074                 case 'J':

  1075                 case 'B':

  1076                 case 'Z':

  1077                 case 'C':

  1078                 case 'I': return " = 0;";

  1079                 case 'F':

  1080                 case 'D': return " = 0.0;";

  1081                 default:

  1082                     throw new IllegalStateException(is);

  1083             }

  1084         }

  1085         return " = null;";

  1086     }

  1087 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sat, 01 Dec 2012 15:30:56 +0100
branch	reflection
changeset 230	b22dbc9329ec
parent 227	fae5261c8a9a
child 231	dde8422fb5ae
permissions	-rw-r--r--