hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@c6a0b5b64133

     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     /**

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

    55      *

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

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

    58      *

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

    60      */

    62     public String compile(InputStream classFile) throws IOException {

    63         this.jc = new ClassData(classFile);

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

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

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

    67             "resource", "processByteCode"

    68         );

    69         if (arr != null) {

    70             requireScript(arr[0]);

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

    72                 return null;

    73             }

    74         }

    75         StringArray toInitilize = new StringArray();

    76         final String className = className(jc);

    77         out.append("\nfunction ").append(className);

    78         out.append("() {");

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

    80             if (!v.isStatic()) {

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

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

    83             }

    84         }

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

    86         out.append("\n\nfunction ").append(className).append("_proto() {");

    87         out.append("\n  if (").append(className).

    88             append(".prototype.$instOf_").append(className).append(") {");

    89         out.append("\n    return new ").append(className).append(";");

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

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

    92             if (v.isStatic()) {

    93                 generateStaticField(v);

    94             }

    95         }

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

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

    98         if (sc != null) {

    99             out.append("\n  var p = ").append(className)

   100                .append(".prototype = ").

   101                 append(sc.replace('/', '_')).append("_proto();");

   102         } else {

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

   104         }

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

   106             if (m.isStatic()) {

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

   108             } else {

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

   110             }

   111         }

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

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

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

   115         }

   116         out.append("\n  return new ").append(className).append(";");

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

   118         out.append("\n").append(className).append("_proto();");

   119         StringBuilder sb = new StringBuilder();

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

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

   122         }

   123         return sb.toString();

   124     }

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

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

   127             return;

   128         }

   129         StringBuilder argsCnt = new StringBuilder();

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

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

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

   133             toInitilize.add(className(jc) + "_proto()." + mn);

   134         }

   135         out.append('(');

   136         String space = "";

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

   138             out.append(space);

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

   140             space = ",";

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

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

   143                 index += 2;

   144             } else {

   145                 index++;

   146             }

   147         }

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

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

   150         if (code != null) {

   151             int len = m.getMaxLocals();

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

   153                 out.append("  var ");

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

   155             }

   156             out.append("  var stack = new Array();\n");

   157             produceCode(code);

   158         } else {

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

   160         }

   161         out.append("};");

   162     }

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

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

   166             return;

   167         }

   168         StringBuilder argsCnt = new StringBuilder();

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

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

   171         out.append("(arg0");

   172         String space = ",";

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

   174             out.append(space);

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

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

   177                 index += 2;

   178             } else {

   179                 index++;

   180             }

   181         }

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

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

   184         if (code != null) {

   185             int len = m.getMaxLocals();

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

   187                 out.append("  var ");

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

   189             }

   190             out.append(";\n  var stack = new Array();\n");

   191             produceCode(code);

   192         } else {

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

   194         }

   195         out.append("};");

   196     }

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

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

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

   201             int prev = i;

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

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

   204             switch (c) {

   205                 case opc_aload_0:

   206                 case opc_iload_0:

   207                 case opc_lload_0:

   208                 case opc_fload_0:

   209                 case opc_dload_0:

   210                     out.append("stack.push(arg0);");

   211                     break;

   212                 case opc_aload_1:

   213                 case opc_iload_1:

   214                 case opc_lload_1:

   215                 case opc_fload_1:

   216                 case opc_dload_1:

   217                     out.append("stack.push(arg1);");

   218                     break;

   219                 case opc_aload_2:

   220                 case opc_iload_2:

   221                 case opc_lload_2:

   222                 case opc_fload_2:

   223                 case opc_dload_2:

   224                     out.append("stack.push(arg2);");

   225                     break;

   226                 case opc_aload_3:

   227                 case opc_iload_3:

   228                 case opc_lload_3:

   229                 case opc_fload_3:

   230                 case opc_dload_3:

   231                     out.append("stack.push(arg3);");

   232                     break;

   233                 case opc_iload:

   234                 case opc_lload:

   235                 case opc_fload:

   236                 case opc_dload:

   237                 case opc_aload: {

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

   239                     out.append("stack.push(arg").append(indx + ");");

   240                     break;

   241                 }

   242                 case opc_istore:

   243                 case opc_lstore:

   244                 case opc_fstore:

   245                 case opc_dstore:

   246                 case opc_astore: {

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

   248                     out.append("arg" + indx).append(" = stack.pop();");

   249                     break;

   250                 }

   251                 case opc_astore_0:

   252                 case opc_istore_0:

   253                 case opc_lstore_0:

   254                 case opc_fstore_0:

   255                 case opc_dstore_0:

   256                     out.append("arg0 = stack.pop();");

   257                     break;

   258                 case opc_astore_1:

   259                 case opc_istore_1:

   260                 case opc_lstore_1:

   261                 case opc_fstore_1:

   262                 case opc_dstore_1:

   263                     out.append("arg1 = stack.pop();");

   264                     break;

   265                 case opc_astore_2:

   266                 case opc_istore_2:

   267                 case opc_lstore_2:

   268                 case opc_fstore_2:

   269                 case opc_dstore_2:

   270                     out.append("arg2 = stack.pop();");

   271                     break;

   272                 case opc_astore_3:

   273                 case opc_istore_3:

   274                 case opc_lstore_3:

   275                 case opc_fstore_3:

   276                 case opc_dstore_3:

   277                     out.append("arg3 = stack.pop();");

   278                     break;

   279                 case opc_iadd:

   280                 case opc_ladd:

   281                 case opc_fadd:

   282                 case opc_dadd:

   283                     out.append("stack.push(stack.pop() + stack.pop());");

   284                     break;

   285                 case opc_isub:

   286                 case opc_lsub:

   287                 case opc_fsub:

   288                 case opc_dsub:

   289                     out.append("{ var tmp = stack.pop(); stack.push(stack.pop() - tmp); }");

   290                     break;

   291                 case opc_imul:

   292                 case opc_lmul:

   293                 case opc_fmul:

   294                 case opc_dmul:

   295                     out.append("stack.push(stack.pop() * stack.pop());");

   296                     break;

   297                 case opc_idiv:

   298                 case opc_ldiv:

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

   300                     break;

   301                 case opc_fdiv:

   302                 case opc_ddiv:

   303                     out.append("{ var tmp = stack.pop(); stack.push(stack.pop() / tmp); }");

   304                     break;

   305                 case opc_irem:

   306                 case opc_lrem:

   307                 case opc_frem:

   308                 case opc_drem:

   309                     out.append("{ var d = stack.pop(); stack.push(stack.pop() % d); }");

   310                     break;

   311                 case opc_iand:

   312                 case opc_land:

   313                     out.append("stack.push(stack.pop() & stack.pop());");

   314                     break;

   315                 case opc_ior:

   316                 case opc_lor:

   317                     out.append("stack.push(stack.pop() | stack.pop());");

   318                     break;

   319                 case opc_ixor:

   320                 case opc_lxor:

   321                     out.append("stack.push(stack.pop() ^ stack.pop());");

   322                     break;

   323                 case opc_ineg:

   324                 case opc_lneg:

   325                 case opc_fneg:

   326                 case opc_dneg:

   327                     out.append("stack.push(- stack.pop());");

   328                     break;

   329                 case opc_ishl:

   330                 case opc_lshl:

   331                     out.append("{ var v = stack.pop(); stack.push(stack.pop() << v); }");

   332                     break;

   333                 case opc_ishr:

   334                 case opc_lshr:

   335                     out.append("{ var v = stack.pop(); stack.push(stack.pop() >> v); }");

   336                     break;

   337                 case opc_iushr:

   338                 case opc_lushr:

   339                     out.append("{ var v = stack.pop(); stack.push(stack.pop() >>> v); }");

   340                     break;

   341                 case opc_iinc: {

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

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

   344                     if (incrBy == 1) {

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

   346                     } else {

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

   348                     }

   349                     break;

   350                 }

   351                 case opc_return:

   352                     out.append("return;");

   353                     break;

   354                 case opc_ireturn:

   355                 case opc_lreturn:

   356                 case opc_freturn:

   357                 case opc_dreturn:

   358                 case opc_areturn:

   359                     out.append("return stack.pop();");

   360                     break;

   361                 case opc_i2l:

   362                 case opc_i2f:

   363                 case opc_i2d:

   364                 case opc_l2i:

   365                     // max int check?

   366                 case opc_l2f:

   367                 case opc_l2d:

   368                 case opc_f2d:

   369                 case opc_d2f:

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

   371                     break;

   372                 case opc_f2i:

   373                 case opc_f2l:

   374                 case opc_d2i:

   375                 case opc_d2l:

   376                     out.append("stack.push(Math.floor(stack.pop()));");

   377                     break;

   378                 case opc_i2b:

   379                 case opc_i2c:

   380                 case opc_i2s:

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

   382                     break;

   383                 case opc_aconst_null:

   384                     out.append("stack.push(null);");

   385                     break;

   386                 case opc_iconst_m1:

   387                     out.append("stack.push(-1);");

   388                     break;

   389                 case opc_iconst_0:

   390                 case opc_dconst_0:

   391                 case opc_lconst_0:

   392                 case opc_fconst_0:

   393                     out.append("stack.push(0);");

   394                     break;

   395                 case opc_iconst_1:

   396                 case opc_lconst_1:

   397                 case opc_fconst_1:

   398                 case opc_dconst_1:

   399                     out.append("stack.push(1);");

   400                     break;

   401                 case opc_iconst_2:

   402                 case opc_fconst_2:

   403                     out.append("stack.push(2);");

   404                     break;

   405                 case opc_iconst_3:

   406                     out.append("stack.push(3);");

   407                     break;

   408                 case opc_iconst_4:

   409                     out.append("stack.push(4);");

   410                     break;

   411                 case opc_iconst_5:

   412                     out.append("stack.push(5);");

   413                     break;

   414                 case opc_ldc: {

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

   416                     String v = encodeConstant(indx);

   417                     out.append("stack.push(").append(v).append(");");

   418                     break;

   419                 }

   420                 case opc_ldc_w:

   421                 case opc_ldc2_w: {

   422                     int indx = readIntArg(byteCodes, i);

   423                     i += 2;

   424                     String v = encodeConstant(indx);

   425                     out.append("stack.push(").append(v).append(");");

   426                     break;

   427                 }

   428                 case opc_lcmp:

   429                 case opc_fcmpl:

   430                 case opc_fcmpg:

   431                 case opc_dcmpl:

   432                 case opc_dcmpg: {

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

   434                     break;

   435                 }

   436                 case opc_if_acmpeq:

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

   438                     break;

   439                 case opc_if_acmpne:

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

   441                     break;

   442                 case opc_if_icmpeq: {

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

   444                     break;

   445                 }

   446                 case opc_ifeq: {

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

   448                     out.append("if (stack.pop() == 0) { gt = " + indx);

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

   450                     i += 2;

   451                     break;

   452                 }

   453                 case opc_ifne: {

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

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

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

   457                     i += 2;

   458                     break;

   459                 }

   460                 case opc_iflt: {

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

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

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

   464                     i += 2;

   465                     break;

   466                 }

   467                 case opc_ifle: {

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

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

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

   471                     i += 2;

   472                     break;

   473                 }

   474                 case opc_ifgt: {

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

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

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

   478                     i += 2;

   479                     break;

   480                 }

   481                 case opc_ifge: {

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

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

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

   485                     i += 2;

   486                     break;

   487                 }

   488                 case opc_ifnonnull: {

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

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

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

   492                     i += 2;

   493                     break;

   494                 }

   495                 case opc_ifnull: {

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

   497                     out.append("if (stack.pop() === null) { gt = " + indx);

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

   499                     i += 2;

   500                     break;

   501                 }

   502                 case opc_if_icmpne:

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

   504                     break;

   505                 case opc_if_icmplt:

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

   507                     break;

   508                 case opc_if_icmple:

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

   510                     break;

   511                 case opc_if_icmpgt:

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

   513                     break;

   514                 case opc_if_icmpge:

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

   516                     break;

   517                 case opc_goto: {

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

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

   520                     i += 2;

   521                     break;

   522                 }

   523                 case opc_lookupswitch: {

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

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

   526                     table += 4;

   527                     int n = readInt4(byteCodes, table);

   528                     table += 4;

   529                     out.append("switch (stack.pop()) {\n");

   530                     while (n-- > 0) {

   531                         int cnstnt = readInt4(byteCodes, table);

   532                         table += 4;

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

   534                         table += 4;

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

   536                     }

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

   538                     i = table - 1;

   539                     break;

   540                 }

   541                 case opc_tableswitch: {

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

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

   544                     table += 4;

   545                     int low = readInt4(byteCodes, table);

   546                     table += 4;

   547                     int high = readInt4(byteCodes, table);

   548                     table += 4;

   549                     out.append("switch (stack.pop()) {\n");

   550                     while (low <= high) {

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

   552                         table += 4;

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

   554                         low++;

   555                     }

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

   557                     i = table - 1;

   558                     break;

   559                 }

   560                 case opc_invokeinterface: {

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

   562                     break;

   563                 }

   564                 case opc_invokevirtual:

   565                     i = invokeVirtualMethod(byteCodes, i);

   566                     break;

   567                 case opc_invokespecial:

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

   569                     break;

   570                 case opc_invokestatic:

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

   572                     break;

   573                 case opc_new: {

   574                     int indx = readIntArg(byteCodes, i);

   575                     String ci = jc.getClassName(indx);

   576                     out.append("stack.push(");

   577                     out.append("new ").append(ci.replace('/','_'));

   578                     out.append(");");

   579                     addReference(ci);

   580                     i += 2;

   581                     break;

   582                 }

   583                 case opc_newarray: {

   584                     int type = byteCodes[i++];

   585                     out.append("stack.push(new Array(stack.pop()).fillNulls());");

   586                     break;

   587                 }

   588                 case opc_anewarray: {

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

   590                     out.append("stack.push(new Array(stack.pop()).fillNulls());");

   591                     break;

   592                 }

   593                 case opc_multianewarray: {

   594                     i += 2;

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

   596                     out.append("{ var a0 = new Array(stack.pop()).fillNulls();");

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

   598                         out.append("\n  var l" + d).append(" = stack.pop();");

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

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

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

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

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

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

   605                             append(";");

   606                     }

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

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

   609                     }

   610                     out.append("\nstack.push(a0); }");

   611                     break;

   612                 }

   613                 case opc_arraylength:

   614                     out.append("stack.push(stack.pop().length);");

   615                     break;

   616                 case opc_iastore:

   617                 case opc_lastore:

   618                 case opc_fastore:

   619                 case opc_dastore:

   620                 case opc_aastore:

   621                 case opc_bastore:

   622                 case opc_castore:

   623                 case opc_sastore: {

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

   625                     break;

   626                 }

   627                 case opc_iaload:

   628                 case opc_laload:

   629                 case opc_faload:

   630                 case opc_daload:

   631                 case opc_aaload:

   632                 case opc_baload:

   633                 case opc_caload:

   634                 case opc_saload: {

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

   636                     break;

   637                 }

   638                 case opc_pop2:

   639                     out.append("stack.pop();");

   640                 case opc_pop:

   641                     out.append("stack.pop();");

   642                     break;

   643                 case opc_dup:

   644                     out.append("stack.push(stack[stack.length - 1]);");

   645                     break;

   646                 case opc_dup_x1:

   647                     out.append("{ var v1 = stack.pop(); var v2 = stack.pop(); stack.push(v1); stack.push(v2); stack.push(v1); }");

   648                     break;

   649                 case opc_dup_x2:

   650                     out.append("{ var v1 = stack.pop(); var v2 = stack.pop(); var v3 = stack.pop(); stack.push(v1); stack.push(v3); stack.push(v2); stack.push(v1); }");

   651                     break;

   652                 case opc_bipush:

   653                     out.append("stack.push(" + byteCodes[++i] + ");");

   654                     break;

   655                 case opc_sipush:

   656                     out.append("stack.push(" + readIntArg(byteCodes, i) + ");");

   657                     i += 2;

   658                     break;

   659                 case opc_getfield: {

   660                     int indx = readIntArg(byteCodes, i);

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

   662                     out.append("stack.push(stack.pop().fld_").

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

   664                     i += 2;

   665                     break;

   666                 }

   667                 case opc_getstatic: {

   668                     int indx = readIntArg(byteCodes, i);

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

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

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

   672                     i += 2;

   673                     addReference(fi[0]);

   674                     break;

   675                 }

   676                 case opc_putstatic: {

   677                     int indx = readIntArg(byteCodes, i);

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

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

   680                     out.append('.').append(fi[1]).append(" = stack.pop();");

   681                     i += 2;

   682                     addReference(fi[0]);

   683                     break;

   684                 }

   685                 case opc_putfield: {

   686                     int indx = readIntArg(byteCodes, i);

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

   688                     out.append("{ var v = stack.pop(); stack.pop().fld_")

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

   690                     i += 2;

   691                     break;

   692                 }

   693                 case opc_checkcast: {

   694                     int indx = readIntArg(byteCodes, i);

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

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

   697                         // no way to check arrays right now

   698                         out.append("if(stack[stack.length - 1].$instOf_")

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

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

   701                     }

   702                     i += 2;

   703                     break;

   704                 }

   705                 case opc_instanceof: {

   706                     int indx = readIntArg(byteCodes, i);

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

   708                     out.append("stack.push(stack.pop().$instOf_")

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

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

   711                     i += 2;

   712                     break;

   713                 }

   714                 case opc_athrow: {

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

   716                     break;

   717                 }

   718                 default: {

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

   720                 }

   722             }

   723             out.append(" //");

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

   725                 out.append(" ");

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

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

   728             }

   729             out.append("\n");

   730         }

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

   732     }

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

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

   736         out.append("if (stack.pop() ").append(test).append(" stack.pop()) { gt = " + indx);

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

   738         return i + 2;

   739     }

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

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

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

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

   745     }

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

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

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

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

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

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

   752     }

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

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

   755     }

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

   758         int i = 0;

   759         Boolean count = null;

   760         boolean array = false;

   761         int firstPos = sig.length();

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

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

   764             switch (ch) {

   765                 case '(':

   766                     count = true;

   767                     continue;

   768                 case ')':

   769                     count = false;

   770                     continue;

   771                 case 'A':

   772                     array = true;

   773                     break;

   774                 case 'B':

   775                 case 'C':

   776                 case 'D':

   777                 case 'F':

   778                 case 'I':

   779                 case 'J':

   780                 case 'S':

   781                 case 'Z':

   782                     if (count) {

   783                         if (array) {

   784                             sig.append('A');

   785                         }

   786                         sig.append(ch);

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

   788                             cnt.append('1');

   789                         } else {

   790                             cnt.append('0');

   791                         }

   792                     } else {

   793                         hasReturnType[0] = true;

   794                         sig.insert(firstPos, ch);

   795                         if (array) {

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

   797                         }

   798                     }

   799                     array = false;

   800                     continue;

   801                 case 'V':

   802                     assert !count;

   803                     hasReturnType[0] = false;

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

   805                     continue;

   806                 case 'L':

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

   808                     if (count) {

   809                         if (array) {

   810                             sig.append('A');

   811                         }

   812                         sig.append(ch);

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

   814                         cnt.append('0');

   815                     } else {

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

   817                         sig.insert(firstPos, ch);

   818                         if (array) {

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

   820                         }

   821                         hasReturnType[0] = true;

   822                     }

   823                     i = next + 1;

   824                     continue;

   825                 case '[':

   826                     //arrays++;

   827                     continue;

   828                 default:

   829                     break; // invalid character

   830             }

   831         }

   832     }

   834     private void generateStaticField(FieldData v) throws IOException {

   835         out.append("\n  ")

   836            .append(className(jc))

   837            .append('.').append(v.getName()).append(initField(v));

   838     }

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

   841         StringBuilder name = new StringBuilder();

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

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

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

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

   846         } else {

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

   848         }

   850         boolean hasReturn[] = { false };

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

   852         return name.toString();

   853     }

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

   856         StringBuilder name = new StringBuilder();

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

   858         String nm= mi[1];

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

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

   861         } else {

   862             name.append(nm);

   863         }

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

   865         return name.toString();

   866     }

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

   869     throws IOException {

   870         int methodIndex = readIntArg(byteCodes, i);

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

   872         boolean[] hasReturn = { false };

   873         StringBuilder cnt = new StringBuilder();

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

   875         out.append("{ ");

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

   877             out.append("var v" + j).append(" = stack.pop(); ");

   878         }

   880         if (hasReturn[0]) {

   881             out.append("stack.push(");

   882         }

   883         final String in = mi[0];

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

   885         out.append(".prototype.");

   886         out.append(mn);

   887         out.append('(');

   888         String sep = "";

   889         if (!isStatic) {

   890             out.append("stack.pop()");

   891             sep = ", ";

   892         }

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

   894             out.append(sep);

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

   896             sep = ", ";

   897         }

   898         out.append(")");

   899         if (hasReturn[0]) {

   900             out.append(")");

   901         }

   902         out.append("; }");

   903         i += 2;

   904         addReference(in);

   905         return i;

   906     }

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

   908     throws IOException {

   909         int methodIndex = readIntArg(byteCodes, i);

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

   911         boolean[] hasReturn = { false };

   912         StringBuilder cnt = new StringBuilder();

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

   914         out.append("{ ");

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

   916             out.append("var v" + j).append(" = stack.pop(); ");

   917         }

   918         out.append("var self = stack.pop(); ");

   919         if (hasReturn[0]) {

   920             out.append("stack.push(");

   921         }

   922         out.append("self.");

   923         out.append(mn);

   924         out.append('(');

   925         out.append("self");

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

   927             out.append(", ");

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

   929         }

   930         out.append(")");

   931         if (hasReturn[0]) {

   932             out.append(")");

   933         }

   934         out.append("; }");

   935         i += 2;

   936         return i;

   937     }

   939     private void addReference(String cn) throws IOException {

   940         if (requireReference(cn)) {

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

   942         }

   943     }

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

   946         int arr = 0;

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

   948             out.append('A');

   949             d = d.substring(1);

   950         }

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

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

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

   954         } else {

   955             out.append(d);

   956         }

   957     }

   959     private String encodeConstant(int entryIndex) {

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

   961         return s;

   962     }

   964     private String findDescriptor(String d) {

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

   966     }

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

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

   970         if (arr == null) {

   971             return false;

   972         }

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

   974         class P extends AnnotationParser {

   975             int cnt;

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

   977             String body;

   979             @Override

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

   981                 if (type.equals(jvmType)) {

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

   983                         body = value;

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

   985                         args[cnt++] = value;

   986                     } else {

   987                         throw new IllegalArgumentException(attr);

   988                     }

   989                 }

   990             }

   991         }

   992         P p = new P();

   993         p.parse(arr, jc);

   994         if (p.body == null) {

   995             return false;

   996         }

   997         StringBuilder cnt = new StringBuilder();

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

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

  1000         String space;

  1001         int index;

  1002         if (!isStatic) {

  1003             out.append(p.args[0]);

  1004             space = ",";

  1005             index = 1;

  1006         } else {

  1007             space = "";

  1008             index = 0;

  1009         }

  1010         for (int i = 0; i < cnt.length(); i++) {

  1011             out.append(space);

  1012             out.append(p.args[index]);

  1013             index++;

  1014             space = ",";

  1015         }

  1016         out.append(") {").append("\n");

  1017         out.append(p.body);

  1018         out.append("\n}\n");

  1019         return true;

  1020     }

  1021     private static String className(ClassData jc) {

  1022         //return jc.getName().getInternalName().replace('/', '_');

  1023         return jc.getClassName().replace('/', '_');

  1024     }

  1026     private static String[] findAnnotation(

  1027         byte[] arr, ClassData cd, final String className,

  1028         final String... attrNames

  1029     ) throws IOException {

  1030         if (arr == null) {

  1031             return null;

  1032         }

  1033         final String[] values = new String[attrNames.length];

  1034         final boolean[] found = { false };

  1035         final String jvmType = "L" + className.replace('.', '/') + ";";

  1036         AnnotationParser ap = new AnnotationParser() {

  1037             @Override

  1038             protected void visitAttr(String type, String attr, String value) {

  1039                 if (type.equals(jvmType)) {

  1040                     found[0] = true;

  1041                     for (int i = 0; i < attrNames.length; i++) {

  1042                         if (attrNames[i].equals(attr)) {

  1043                             values[i] = value;

  1044                         }

  1045                     }

  1046                 }

  1047             }

  1049         };

  1050         ap.parse(arr, cd);

  1051         return found[0] ? values : null;

  1052     }

  1054     private CharSequence initField(FieldData v) {

  1055         final String is = v.getInternalSig();

  1056         if (is.length() == 1) {

  1057             switch (is.charAt(0)) {

  1058                 case 'S':

  1059                 case 'J':

  1060                 case 'B':

  1061                 case 'Z':

  1062                 case 'C':

  1063                 case 'I': return " = 0;";

  1064                 case 'F':

  1065                 case 'D': return " = 0.0;";

  1066                 default:

  1067                     throw new IllegalStateException(is);

  1068             }

  1069         }

  1070         return " = null;";

  1071     }

  1072 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sun, 25 Nov 2012 23:14:58 +0100
branch	lazy
changeset 203	c6a0b5b64133
parent 200	227bafe6ef52
child 204	590a8c98df30
permissions	-rw-r--r--