hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@0256fac49ea5

     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("\n\nfunction ").append(className).append("() {");

    78         out.append("\n  if (!").append(className).

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

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

    81             if (v.isStatic()) {

    82                 generateStaticField(v);

    83             }

    84         }

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

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

    87         if (sc != null) {

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

    89                .append(".prototype = ").

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

    91         } else {

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

    93         }

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

    95             if (m.isStatic()) {

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

    97             } else {

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

    99             }

   100         }

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

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

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

   104         }

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

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

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

   108             if (!v.isStatic()) {

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

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

   111             }

   112         }

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

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

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

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

   117         out.append("\n").append(className).append("(true);");

   118         StringBuilder sb = new StringBuilder();

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

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

   121         }

   122         return sb.toString();

   123     }

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

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

   126             return;

   127         }

   128         StringBuilder argsCnt = new StringBuilder();

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

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

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

   132             toInitilize.add(className(jc) + "(true)." + mn);

   133         }

   134         out.append('(');

   135         String space = "";

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

   137             out.append(space);

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

   139             space = ",";

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

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

   142                 index += 2;

   143             } else {

   144                 index++;

   145             }

   146         }

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

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

   149         if (code != null) {

   150             int len = m.getMaxLocals();

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

   152                 out.append("  var ");

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

   154             }

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

   156             produceCode(code);

   157         } else {

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

   159         }

   160         out.append("};");

   161     }

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

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

   165             return;

   166         }

   167         StringBuilder argsCnt = new StringBuilder();

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

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

   170         out.append("(arg0");

   171         String space = ",";

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

   173             out.append(space);

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

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

   176                 index += 2;

   177             } else {

   178                 index++;

   179             }

   180         }

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

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

   183         if (code != null) {

   184             int len = m.getMaxLocals();

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

   186                 out.append("  var ");

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

   188             }

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

   190             produceCode(code);

   191         } else {

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

   193         }

   194         out.append("};");

   195     }

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

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

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

   200             int prev = i;

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

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

   203             switch (c) {

   204                 case opc_aload_0:

   205                 case opc_iload_0:

   206                 case opc_lload_0:

   207                 case opc_fload_0:

   208                 case opc_dload_0:

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

   210                     break;

   211                 case opc_aload_1:

   212                 case opc_iload_1:

   213                 case opc_lload_1:

   214                 case opc_fload_1:

   215                 case opc_dload_1:

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

   217                     break;

   218                 case opc_aload_2:

   219                 case opc_iload_2:

   220                 case opc_lload_2:

   221                 case opc_fload_2:

   222                 case opc_dload_2:

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

   224                     break;

   225                 case opc_aload_3:

   226                 case opc_iload_3:

   227                 case opc_lload_3:

   228                 case opc_fload_3:

   229                 case opc_dload_3:

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

   231                     break;

   232                 case opc_iload:

   233                 case opc_lload:

   234                 case opc_fload:

   235                 case opc_dload:

   236                 case opc_aload: {

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

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

   239                     break;

   240                 }

   241                 case opc_istore:

   242                 case opc_lstore:

   243                 case opc_fstore:

   244                 case opc_dstore:

   245                 case opc_astore: {

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

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

   248                     break;

   249                 }

   250                 case opc_astore_0:

   251                 case opc_istore_0:

   252                 case opc_lstore_0:

   253                 case opc_fstore_0:

   254                 case opc_dstore_0:

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

   256                     break;

   257                 case opc_astore_1:

   258                 case opc_istore_1:

   259                 case opc_lstore_1:

   260                 case opc_fstore_1:

   261                 case opc_dstore_1:

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

   263                     break;

   264                 case opc_astore_2:

   265                 case opc_istore_2:

   266                 case opc_lstore_2:

   267                 case opc_fstore_2:

   268                 case opc_dstore_2:

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

   270                     break;

   271                 case opc_astore_3:

   272                 case opc_istore_3:

   273                 case opc_lstore_3:

   274                 case opc_fstore_3:

   275                 case opc_dstore_3:

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

   277                     break;

   278                 case opc_iadd:

   279                 case opc_ladd:

   280                 case opc_fadd:

   281                 case opc_dadd:

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

   283                     break;

   284                 case opc_isub:

   285                 case opc_lsub:

   286                 case opc_fsub:

   287                 case opc_dsub:

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

   289                     break;

   290                 case opc_imul:

   291                 case opc_lmul:

   292                 case opc_fmul:

   293                 case opc_dmul:

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

   295                     break;

   296                 case opc_idiv:

   297                 case opc_ldiv:

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

   299                     break;

   300                 case opc_fdiv:

   301                 case opc_ddiv:

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

   303                     break;

   304                 case opc_irem:

   305                 case opc_lrem:

   306                 case opc_frem:

   307                 case opc_drem:

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

   309                     break;

   310                 case opc_iand:

   311                 case opc_land:

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

   313                     break;

   314                 case opc_ior:

   315                 case opc_lor:

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

   317                     break;

   318                 case opc_ixor:

   319                 case opc_lxor:

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

   321                     break;

   322                 case opc_ineg:

   323                 case opc_lneg:

   324                 case opc_fneg:

   325                 case opc_dneg:

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

   327                     break;

   328                 case opc_ishl:

   329                 case opc_lshl:

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

   331                     break;

   332                 case opc_ishr:

   333                 case opc_lshr:

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

   335                     break;

   336                 case opc_iushr:

   337                 case opc_lushr:

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

   339                     break;

   340                 case opc_iinc: {

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

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

   343                     if (incrBy == 1) {

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

   345                     } else {

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

   347                     }

   348                     break;

   349                 }

   350                 case opc_return:

   351                     out.append("return;");

   352                     break;

   353                 case opc_ireturn:

   354                 case opc_lreturn:

   355                 case opc_freturn:

   356                 case opc_dreturn:

   357                 case opc_areturn:

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

   359                     break;

   360                 case opc_i2l:

   361                 case opc_i2f:

   362                 case opc_i2d:

   363                 case opc_l2i:

   364                     // max int check?

   365                 case opc_l2f:

   366                 case opc_l2d:

   367                 case opc_f2d:

   368                 case opc_d2f:

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

   370                     break;

   371                 case opc_f2i:

   372                 case opc_f2l:

   373                 case opc_d2i:

   374                 case opc_d2l:

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

   376                     break;

   377                 case opc_i2b:

   378                 case opc_i2c:

   379                 case opc_i2s:

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

   381                     break;

   382                 case opc_aconst_null:

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

   384                     break;

   385                 case opc_iconst_m1:

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

   387                     break;

   388                 case opc_iconst_0:

   389                 case opc_dconst_0:

   390                 case opc_lconst_0:

   391                 case opc_fconst_0:

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

   393                     break;

   394                 case opc_iconst_1:

   395                 case opc_lconst_1:

   396                 case opc_fconst_1:

   397                 case opc_dconst_1:

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

   399                     break;

   400                 case opc_iconst_2:

   401                 case opc_fconst_2:

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

   403                     break;

   404                 case opc_iconst_3:

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

   406                     break;

   407                 case opc_iconst_4:

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

   409                     break;

   410                 case opc_iconst_5:

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

   412                     break;

   413                 case opc_ldc: {

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

   415                     String v = encodeConstant(indx);

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

   417                     break;

   418                 }

   419                 case opc_ldc_w:

   420                 case opc_ldc2_w: {

   421                     int indx = readIntArg(byteCodes, i);

   422                     i += 2;

   423                     String v = encodeConstant(indx);

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

   425                     break;

   426                 }

   427                 case opc_lcmp:

   428                 case opc_fcmpl:

   429                 case opc_fcmpg:

   430                 case opc_dcmpl:

   431                 case opc_dcmpg: {

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

   433                     break;

   434                 }

   435                 case opc_if_acmpeq:

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

   437                     break;

   438                 case opc_if_acmpne:

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

   440                     break;

   441                 case opc_if_icmpeq: {

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

   443                     break;

   444                 }

   445                 case opc_ifeq: {

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

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

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

   449                     i += 2;

   450                     break;

   451                 }

   452                 case opc_ifne: {

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

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

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

   456                     i += 2;

   457                     break;

   458                 }

   459                 case opc_iflt: {

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

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

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

   463                     i += 2;

   464                     break;

   465                 }

   466                 case opc_ifle: {

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

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

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

   470                     i += 2;

   471                     break;

   472                 }

   473                 case opc_ifgt: {

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

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

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

   477                     i += 2;

   478                     break;

   479                 }

   480                 case opc_ifge: {

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

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

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

   484                     i += 2;

   485                     break;

   486                 }

   487                 case opc_ifnonnull: {

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

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

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

   491                     i += 2;

   492                     break;

   493                 }

   494                 case opc_ifnull: {

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

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

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

   498                     i += 2;

   499                     break;

   500                 }

   501                 case opc_if_icmpne:

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

   503                     break;

   504                 case opc_if_icmplt:

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

   506                     break;

   507                 case opc_if_icmple:

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

   509                     break;

   510                 case opc_if_icmpgt:

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

   512                     break;

   513                 case opc_if_icmpge:

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

   515                     break;

   516                 case opc_goto: {

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

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

   519                     i += 2;

   520                     break;

   521                 }

   522                 case opc_lookupswitch: {

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

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

   525                     table += 4;

   526                     int n = readInt4(byteCodes, table);

   527                     table += 4;

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

   529                     while (n-- > 0) {

   530                         int cnstnt = readInt4(byteCodes, table);

   531                         table += 4;

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

   533                         table += 4;

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

   535                     }

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

   537                     i = table - 1;

   538                     break;

   539                 }

   540                 case opc_tableswitch: {

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

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

   543                     table += 4;

   544                     int low = readInt4(byteCodes, table);

   545                     table += 4;

   546                     int high = readInt4(byteCodes, table);

   547                     table += 4;

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

   549                     while (low <= high) {

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

   551                         table += 4;

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

   553                         low++;

   554                     }

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

   556                     i = table - 1;

   557                     break;

   558                 }

   559                 case opc_invokeinterface: {

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

   561                     break;

   562                 }

   563                 case opc_invokevirtual:

   564                     i = invokeVirtualMethod(byteCodes, i);

   565                     break;

   566                 case opc_invokespecial:

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

   568                     break;

   569                 case opc_invokestatic:

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

   571                     break;

   572                 case opc_new: {

   573                     int indx = readIntArg(byteCodes, i);

   574                     String ci = jc.getClassName(indx);

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

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

   577                     out.append(");");

   578                     addReference(ci);

   579                     i += 2;

   580                     break;

   581                 }

   582                 case opc_newarray: {

   583                     int type = byteCodes[i++];

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

   585                     break;

   586                 }

   587                 case opc_anewarray: {

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

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

   590                     break;

   591                 }

   592                 case opc_multianewarray: {

   593                     i += 2;

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

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

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

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

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

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

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

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

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

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

   604                             append(";");

   605                     }

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

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

   608                     }

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

   610                     break;

   611                 }

   612                 case opc_arraylength:

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

   614                     break;

   615                 case opc_iastore:

   616                 case opc_lastore:

   617                 case opc_fastore:

   618                 case opc_dastore:

   619                 case opc_aastore:

   620                 case opc_bastore:

   621                 case opc_castore:

   622                 case opc_sastore: {

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

   624                     break;

   625                 }

   626                 case opc_iaload:

   627                 case opc_laload:

   628                 case opc_faload:

   629                 case opc_daload:

   630                 case opc_aaload:

   631                 case opc_baload:

   632                 case opc_caload:

   633                 case opc_saload: {

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

   635                     break;

   636                 }

   637                 case opc_pop2:

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

   639                 case opc_pop:

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

   641                     break;

   642                 case opc_dup:

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

   644                     break;

   645                 case opc_dup_x1:

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

   647                     break;

   648                 case opc_dup_x2:

   649                     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); }");

   650                     break;

   651                 case opc_bipush:

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

   653                     break;

   654                 case opc_sipush:

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

   656                     i += 2;

   657                     break;

   658                 case opc_getfield: {

   659                     int indx = readIntArg(byteCodes, i);

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

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

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

   663                     i += 2;

   664                     break;

   665                 }

   666                 case opc_getstatic: {

   667                     int indx = readIntArg(byteCodes, i);

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

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

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

   671                     i += 2;

   672                     addReference(fi[0]);

   673                     break;

   674                 }

   675                 case opc_putstatic: {

   676                     int indx = readIntArg(byteCodes, i);

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

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

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

   680                     i += 2;

   681                     addReference(fi[0]);

   682                     break;

   683                 }

   684                 case opc_putfield: {

   685                     int indx = readIntArg(byteCodes, i);

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

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

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

   689                     i += 2;

   690                     break;

   691                 }

   692                 case opc_checkcast: {

   693                     int indx = readIntArg(byteCodes, i);

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

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

   696                         // no way to check arrays right now

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

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

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

   700                     }

   701                     i += 2;

   702                     break;

   703                 }

   704                 case opc_instanceof: {

   705                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   710                     i += 2;

   711                     break;

   712                 }

   713                 case opc_athrow: {

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

   715                     break;

   716                 }

   717                 default: {

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

   719                 }

   721             }

   722             out.append(" //");

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

   724                 out.append(" ");

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

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

   727             }

   728             out.append("\n");

   729         }

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

   731     }

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

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

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

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

   737         return i + 2;

   738     }

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

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

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

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

   744     }

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

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

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

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

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

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

   751     }

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

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

   754     }

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

   757         int i = 0;

   758         Boolean count = null;

   759         boolean array = false;

   760         int firstPos = sig.length();

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

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

   763             switch (ch) {

   764                 case '(':

   765                     count = true;

   766                     continue;

   767                 case ')':

   768                     count = false;

   769                     continue;

   770                 case 'A':

   771                     array = true;

   772                     break;

   773                 case 'B':

   774                 case 'C':

   775                 case 'D':

   776                 case 'F':

   777                 case 'I':

   778                 case 'J':

   779                 case 'S':

   780                 case 'Z':

   781                     if (count) {

   782                         if (array) {

   783                             sig.append('A');

   784                         }

   785                         sig.append(ch);

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

   787                             cnt.append('1');

   788                         } else {

   789                             cnt.append('0');

   790                         }

   791                     } else {

   792                         hasReturnType[0] = true;

   793                         sig.insert(firstPos, ch);

   794                         if (array) {

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

   796                         }

   797                     }

   798                     array = false;

   799                     continue;

   800                 case 'V':

   801                     assert !count;

   802                     hasReturnType[0] = false;

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

   804                     continue;

   805                 case 'L':

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

   807                     if (count) {

   808                         if (array) {

   809                             sig.append('A');

   810                         }

   811                         sig.append(ch);

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

   813                         cnt.append('0');

   814                     } else {

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

   816                         sig.insert(firstPos, ch);

   817                         if (array) {

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

   819                         }

   820                         hasReturnType[0] = true;

   821                     }

   822                     i = next + 1;

   823                     continue;

   824                 case '[':

   825                     //arrays++;

   826                     continue;

   827                 default:

   828                     break; // invalid character

   829             }

   830         }

   831     }

   833     private void generateStaticField(FieldData v) throws IOException {

   834         out.append("\n  ")

   835            .append(className(jc))

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

   837     }

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

   840         StringBuilder name = new StringBuilder();

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

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

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

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

   845         } else {

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

   847         }

   849         boolean hasReturn[] = { false };

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

   851         return name.toString();

   852     }

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

   855         StringBuilder name = new StringBuilder();

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

   857         String nm= mi[1];

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

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

   860         } else {

   861             name.append(nm);

   862         }

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

   864         return name.toString();

   865     }

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

   868     throws IOException {

   869         int methodIndex = readIntArg(byteCodes, i);

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

   871         boolean[] hasReturn = { false };

   872         StringBuilder cnt = new StringBuilder();

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

   874         out.append("{ ");

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

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

   877         }

   879         if (hasReturn[0]) {

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

   881         }

   882         final String in = mi[0];

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

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

   885         out.append(mn);

   886         out.append('(');

   887         String sep = "";

   888         if (!isStatic) {

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

   890             sep = ", ";

   891         }

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

   893             out.append(sep);

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

   895             sep = ", ";

   896         }

   897         out.append(")");

   898         if (hasReturn[0]) {

   899             out.append(")");

   900         }

   901         out.append("; }");

   902         i += 2;

   903         addReference(in);

   904         return i;

   905     }

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

   907     throws IOException {

   908         int methodIndex = readIntArg(byteCodes, i);

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

   910         boolean[] hasReturn = { false };

   911         StringBuilder cnt = new StringBuilder();

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

   913         out.append("{ ");

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

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

   916         }

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

   918         if (hasReturn[0]) {

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

   920         }

   921         out.append("self.");

   922         out.append(mn);

   923         out.append('(');

   924         out.append("self");

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

   926             out.append(", ");

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

   928         }

   929         out.append(")");

   930         if (hasReturn[0]) {

   931             out.append(")");

   932         }

   933         out.append("; }");

   934         i += 2;

   935         return i;

   936     }

   938     private void addReference(String cn) throws IOException {

   939         if (requireReference(cn)) {

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

   941         }

   942     }

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

   945         int arr = 0;

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

   947             out.append('A');

   948             d = d.substring(1);

   949         }

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

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

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

   953         } else {

   954             out.append(d);

   955         }

   956     }

   958     private String encodeConstant(int entryIndex) {

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

   960         return s;

   961     }

   963     private String findDescriptor(String d) {

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

   965     }

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

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

   969         if (arr == null) {

   970             return false;

   971         }

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

   973         class P extends AnnotationParser {

   974             int cnt;

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

   976             String body;

   978             @Override

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

   980                 if (type.equals(jvmType)) {

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

   982                         body = value;

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

   984                         args[cnt++] = value;

   985                     } else {

   986                         throw new IllegalArgumentException(attr);

   987                     }

   988                 }

   989             }

   990         }

   991         P p = new P();

   992         p.parse(arr, jc);

   993         if (p.body == null) {

   994             return false;

   995         }

   996         StringBuilder cnt = new StringBuilder();

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

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

   999         String space;

  1000         int index;

  1001         if (!isStatic) {

  1002             out.append(p.args[0]);

  1003             space = ",";

  1004             index = 1;

  1005         } else {

  1006             space = "";

  1007             index = 0;

  1008         }

  1009         for (int i = 0; i < cnt.length(); i++) {

  1010             out.append(space);

  1011             out.append(p.args[index]);

  1012             index++;

  1013             space = ",";

  1014         }

  1015         out.append(") {").append("\n");

  1016         out.append(p.body);

  1017         out.append("\n}\n");

  1018         return true;

  1019     }

  1020     private static String className(ClassData jc) {

  1021         //return jc.getName().getInternalName().replace('/', '_');

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

  1023     }

  1025     private static String[] findAnnotation(

  1026         byte[] arr, ClassData cd, final String className,

  1027         final String... attrNames

  1028     ) throws IOException {

  1029         if (arr == null) {

  1030             return null;

  1031         }

  1032         final String[] values = new String[attrNames.length];

  1033         final boolean[] found = { false };

  1034         final String jvmType = "L" + className.replace('.', '/') + ";";

  1035         AnnotationParser ap = new AnnotationParser() {

  1036             @Override

  1037             protected void visitAttr(String type, String attr, String value) {

  1038                 if (type.equals(jvmType)) {

  1039                     found[0] = true;

  1040                     for (int i = 0; i < attrNames.length; i++) {

  1041                         if (attrNames[i].equals(attr)) {

  1042                             values[i] = value;

  1043                         }

  1044                     }

  1045                 }

  1046             }

  1048         };

  1049         ap.parse(arr, cd);

  1050         return found[0] ? values : null;

  1051     }

  1053     private CharSequence initField(FieldData v) {

  1054         final String is = v.getInternalSig();

  1055         if (is.length() == 1) {

  1056             switch (is.charAt(0)) {

  1057                 case 'S':

  1058                 case 'J':

  1059                 case 'B':

  1060                 case 'Z':

  1061                 case 'C':

  1062                 case 'I': return " = 0;";

  1063                 case 'F':

  1064                 case 'D': return " = 0.0;";

  1065                 default:

  1066                     throw new IllegalStateException(is);

  1067             }

  1068         }

  1069         return " = null;";

  1070     }

  1071 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Mon, 26 Nov 2012 20:29:21 +0100
branch	lazy
changeset 205	0256fac49ea5
parent 204	590a8c98df30
child 209	bcbaed2a6627
permissions	-rw-r--r--