hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@c18c3df35966

     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.bck2brwsr.core.JavaScriptBody;

    23 import org.apidesign.javap.AnnotationParser;

    24 import org.apidesign.javap.ClassData;

    25 import org.apidesign.javap.FieldData;

    26 import org.apidesign.javap.MethodData;

    27 import static org.apidesign.javap.RuntimeConstants.*;

    29 /** Translator of the code inside class files to JavaScript.

    30  *

    31  * @author Jaroslav Tulach <jtulach@netbeans.org>

    32  */

    33 public abstract class ByteCodeToJavaScript {

    34     private ClassData jc;

    35     private final Appendable out;

    37     protected ByteCodeToJavaScript(Appendable out) {

    38         this.out = out;

    39     }

    41     /* Collects additional required resources.

    42      *

    43      * @param internalClassName classes that were referenced and should be loaded in order the

    44      *   generated JavaScript code works properly. The names are in internal

    45      *   JVM form so String is <code>java/lang/String</code>.

    46      */

    47     protected abstract boolean requireReference(String internalClassName);

    49     /*

    50      * @param resourcePath name of resources to read

    51      */

    52     protected abstract void requireScript(String resourcePath);

    54     /**

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

    56      *

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

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

    59      *

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

    61      */

    63     public String compile(InputStream classFile) throws IOException {

    64         this.jc = new ClassData(classFile);

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

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

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

    68             "resource", "processByteCode"

    69         );

    70         if (arr != null) {

    71             requireScript(arr[0]);

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

    73                 return null;

    74             }

    75         }

    76         StringArray toInitilize = new StringArray();

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

    78             if (m.isStatic()) {

    79                 generateStaticMethod(m, toInitilize);

    80             } else {

    81                 generateInstanceMethod(m);

    82             }

    83         }

    84         final String className = className(jc);

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

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

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

    88             if (!v.isStatic()) {

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

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

    91             }

    92         }

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

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

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

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

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

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

    99             if (v.isStatic()) {

   100                 generateStaticField(v);

   101             }

   102         }

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

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

   105         if (sc != null) {

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

   107                .append(".prototype = ").

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

   109         } else {

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

   111         }

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

   113             if (!m.getName().contains("<cinit>")) {

   114                 generateMethodReference("\n  p.", m);

   115             }

   116         }

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

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

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

   120         }

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

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

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

   124         StringBuilder sb = new StringBuilder();

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

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

   127         }

   128         return sb.toString();

   129     }

   130     private void generateStaticMethod(MethodData m, StringArray toInitilize) throws IOException {

   131         if (javaScriptBody(m, true)) {

   132             return;

   133         }

   134         StringBuilder argsCnt = new StringBuilder();

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

   136         out.append("\nfunction ").append(

   137             className(jc)

   138         ).append('_').append(mn);

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

   140             toInitilize.add(className(jc) + '_' + mn);

   141         }

   142         out.append('(');

   143         String space = "";

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

   145             out.append(space);

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

   147             space = ",";

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

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

   150                 index += 2;

   151             } else {

   152                 index++;

   153             }

   154         }

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

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

   157         if (code != null) {

   158             int len = m.getMaxLocals();

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

   160                 out.append("  var ");

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

   162             }

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

   164             produceCode(code);

   165         } else {

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

   167         }

   168         out.append("}");

   169     }

   171     private void generateMethodReference(String prefix, MethodData m) throws IOException {

   172         final String name = findMethodName(m, new StringBuilder());

   173         out.append(prefix).append(name).append(" = ")

   174            .append(className(jc))

   175            .append('_').append(name).append(";");

   176     }

   178     private void generateInstanceMethod(MethodData m) throws IOException {

   179         if (javaScriptBody(m, false)) {

   180             return;

   181         }

   182         StringBuilder argsCnt = new StringBuilder();

   183         out.append("\nfunction ").append(

   184             className(jc)

   185         ).append('_').append(findMethodName(m, argsCnt));

   186         out.append("(arg0");

   187         String space = ",";

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

   189             out.append(space);

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

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

   192                 index += 2;

   193             } else {

   194                 index++;

   195             }

   196         }

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

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

   199         if (code != null) {

   200             int len = m.getMaxLocals();

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

   202                 out.append("  var ");

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

   204             }

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

   206             produceCode(code);

   207         } else {

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

   209         }

   210         out.append("}");

   211     }

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

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

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

   216             int prev = i;

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

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

   219             switch (c) {

   220                 case opc_aload_0:

   221                 case opc_iload_0:

   222                 case opc_lload_0:

   223                 case opc_fload_0:

   224                 case opc_dload_0:

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

   226                     break;

   227                 case opc_aload_1:

   228                 case opc_iload_1:

   229                 case opc_lload_1:

   230                 case opc_fload_1:

   231                 case opc_dload_1:

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

   233                     break;

   234                 case opc_aload_2:

   235                 case opc_iload_2:

   236                 case opc_lload_2:

   237                 case opc_fload_2:

   238                 case opc_dload_2:

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

   240                     break;

   241                 case opc_aload_3:

   242                 case opc_iload_3:

   243                 case opc_lload_3:

   244                 case opc_fload_3:

   245                 case opc_dload_3:

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

   247                     break;

   248                 case opc_iload:

   249                 case opc_lload:

   250                 case opc_fload:

   251                 case opc_dload:

   252                 case opc_aload: {

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

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

   255                     break;

   256                 }

   257                 case opc_istore:

   258                 case opc_lstore:

   259                 case opc_fstore:

   260                 case opc_dstore:

   261                 case opc_astore: {

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

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

   264                     break;

   265                 }

   266                 case opc_astore_0:

   267                 case opc_istore_0:

   268                 case opc_lstore_0:

   269                 case opc_fstore_0:

   270                 case opc_dstore_0:

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

   272                     break;

   273                 case opc_astore_1:

   274                 case opc_istore_1:

   275                 case opc_lstore_1:

   276                 case opc_fstore_1:

   277                 case opc_dstore_1:

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

   279                     break;

   280                 case opc_astore_2:

   281                 case opc_istore_2:

   282                 case opc_lstore_2:

   283                 case opc_fstore_2:

   284                 case opc_dstore_2:

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

   286                     break;

   287                 case opc_astore_3:

   288                 case opc_istore_3:

   289                 case opc_lstore_3:

   290                 case opc_fstore_3:

   291                 case opc_dstore_3:

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

   293                     break;

   294                 case opc_iadd:

   295                 case opc_ladd:

   296                 case opc_fadd:

   297                 case opc_dadd:

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

   299                     break;

   300                 case opc_isub:

   301                 case opc_lsub:

   302                 case opc_fsub:

   303                 case opc_dsub:

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

   305                     break;

   306                 case opc_imul:

   307                 case opc_lmul:

   308                 case opc_fmul:

   309                 case opc_dmul:

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

   311                     break;

   312                 case opc_idiv:

   313                 case opc_ldiv:

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

   315                     break;

   316                 case opc_fdiv:

   317                 case opc_ddiv:

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

   319                     break;

   320                 case opc_irem:

   321                 case opc_lrem:

   322                 case opc_frem:

   323                 case opc_drem:

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

   325                     break;

   326                 case opc_iand:

   327                 case opc_land:

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

   329                     break;

   330                 case opc_ior:

   331                 case opc_lor:

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

   333                     break;

   334                 case opc_ixor:

   335                 case opc_lxor:

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

   337                     break;

   338                 case opc_ineg:

   339                 case opc_lneg:

   340                 case opc_fneg:

   341                 case opc_dneg:

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

   343                     break;

   344                 case opc_ishl:

   345                 case opc_lshl:

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

   347                     break;

   348                 case opc_ishr:

   349                 case opc_lshr:

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

   351                     break;

   352                 case opc_iushr:

   353                 case opc_lushr:

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

   355                     break;

   356                 case opc_iinc: {

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

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

   359                     if (incrBy == 1) {

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

   361                     } else {

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

   363                     }

   364                     break;

   365                 }

   366                 case opc_return:

   367                     out.append("return;");

   368                     break;

   369                 case opc_ireturn:

   370                 case opc_lreturn:

   371                 case opc_freturn:

   372                 case opc_dreturn:

   373                 case opc_areturn:

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

   375                     break;

   376                 case opc_i2l:

   377                 case opc_i2f:

   378                 case opc_i2d:

   379                 case opc_l2i:

   380                     // max int check?

   381                 case opc_l2f:

   382                 case opc_l2d:

   383                 case opc_f2d:

   384                 case opc_d2f:

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

   386                     break;

   387                 case opc_f2i:

   388                 case opc_f2l:

   389                 case opc_d2i:

   390                 case opc_d2l:

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

   392                     break;

   393                 case opc_i2b:

   394                 case opc_i2c:

   395                 case opc_i2s:

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

   397                     break;

   398                 case opc_aconst_null:

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

   400                     break;

   401                 case opc_iconst_m1:

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

   403                     break;

   404                 case opc_iconst_0:

   405                 case opc_dconst_0:

   406                 case opc_lconst_0:

   407                 case opc_fconst_0:

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

   409                     break;

   410                 case opc_iconst_1:

   411                 case opc_lconst_1:

   412                 case opc_fconst_1:

   413                 case opc_dconst_1:

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

   415                     break;

   416                 case opc_iconst_2:

   417                 case opc_fconst_2:

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

   419                     break;

   420                 case opc_iconst_3:

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

   422                     break;

   423                 case opc_iconst_4:

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

   425                     break;

   426                 case opc_iconst_5:

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

   428                     break;

   429                 case opc_ldc: {

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

   431                     String v = encodeConstant(indx);

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

   433                     break;

   434                 }

   435                 case opc_ldc_w:

   436                 case opc_ldc2_w: {

   437                     int indx = readIntArg(byteCodes, i);

   438                     i += 2;

   439                     String v = encodeConstant(indx);

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

   441                     break;

   442                 }

   443                 case opc_lcmp:

   444                 case opc_fcmpl:

   445                 case opc_fcmpg:

   446                 case opc_dcmpl:

   447                 case opc_dcmpg: {

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

   449                     break;

   450                 }

   451                 case opc_if_acmpeq:

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

   453                     break;

   454                 case opc_if_acmpne:

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

   456                     break;

   457                 case opc_if_icmpeq: {

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

   459                     break;

   460                 }

   461                 case opc_ifeq: {

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

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

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

   465                     i += 2;

   466                     break;

   467                 }

   468                 case opc_ifne: {

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

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

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

   472                     i += 2;

   473                     break;

   474                 }

   475                 case opc_iflt: {

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

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

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

   479                     i += 2;

   480                     break;

   481                 }

   482                 case opc_ifle: {

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

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

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

   486                     i += 2;

   487                     break;

   488                 }

   489                 case opc_ifgt: {

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

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

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

   493                     i += 2;

   494                     break;

   495                 }

   496                 case opc_ifge: {

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

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

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

   500                     i += 2;

   501                     break;

   502                 }

   503                 case opc_ifnonnull: {

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

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

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

   507                     i += 2;

   508                     break;

   509                 }

   510                 case opc_ifnull: {

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

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

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

   514                     i += 2;

   515                     break;

   516                 }

   517                 case opc_if_icmpne:

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

   519                     break;

   520                 case opc_if_icmplt:

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

   522                     break;

   523                 case opc_if_icmple:

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

   525                     break;

   526                 case opc_if_icmpgt:

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

   528                     break;

   529                 case opc_if_icmpge:

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

   531                     break;

   532                 case opc_goto: {

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

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

   535                     i += 2;

   536                     break;

   537                 }

   538                 case opc_lookupswitch: {

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

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

   541                     table += 4;

   542                     int n = readInt4(byteCodes, table);

   543                     table += 4;

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

   545                     while (n-- > 0) {

   546                         int cnstnt = readInt4(byteCodes, table);

   547                         table += 4;

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

   549                         table += 4;

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

   551                     }

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

   553                     i = table - 1;

   554                     break;

   555                 }

   556                 case opc_tableswitch: {

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

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

   559                     table += 4;

   560                     int low = readInt4(byteCodes, table);

   561                     table += 4;

   562                     int high = readInt4(byteCodes, table);

   563                     table += 4;

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

   565                     while (low <= high) {

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

   567                         table += 4;

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

   569                         low++;

   570                     }

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

   572                     i = table - 1;

   573                     break;

   574                 }

   575                 case opc_invokeinterface: {

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

   577                     break;

   578                 }

   579                 case opc_invokevirtual:

   580                     i = invokeVirtualMethod(byteCodes, i);

   581                     break;

   582                 case opc_invokespecial:

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

   584                     break;

   585                 case opc_invokestatic:

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

   587                     break;

   588                 case opc_new: {

   589                     int indx = readIntArg(byteCodes, i);

   590                     String ci = jc.getClassName(indx);

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

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

   593                     out.append(");");

   594                     addReference(ci);

   595                     i += 2;

   596                     break;

   597                 }

   598                 case opc_newarray: {

   599                     int type = byteCodes[i++];

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

   601                     break;

   602                 }

   603                 case opc_anewarray: {

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

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

   606                     break;

   607                 }

   608                 case opc_multianewarray: {

   609                     i += 2;

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

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

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

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

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

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

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

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

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

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

   620                             append(";");

   621                     }

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

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

   624                     }

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

   626                     break;

   627                 }

   628                 case opc_arraylength:

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

   630                     break;

   631                 case opc_iastore:

   632                 case opc_lastore:

   633                 case opc_fastore:

   634                 case opc_dastore:

   635                 case opc_aastore:

   636                 case opc_bastore:

   637                 case opc_castore:

   638                 case opc_sastore: {

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

   640                     break;

   641                 }

   642                 case opc_iaload:

   643                 case opc_laload:

   644                 case opc_faload:

   645                 case opc_daload:

   646                 case opc_aaload:

   647                 case opc_baload:

   648                 case opc_caload:

   649                 case opc_saload: {

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

   651                     break;

   652                 }

   653                 case opc_pop2:

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

   655                 case opc_pop:

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

   657                     break;

   658                 case opc_dup:

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

   660                     break;

   661                 case opc_dup_x1:

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

   663                     break;

   664                 case opc_dup_x2:

   665                     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); }");

   666                     break;

   667                 case opc_bipush:

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

   669                     break;

   670                 case opc_sipush:

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

   672                     i += 2;

   673                     break;

   674                 case opc_getfield: {

   675                     int indx = readIntArg(byteCodes, i);

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

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

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

   679                     i += 2;

   680                     break;

   681                 }

   682                 case opc_getstatic: {

   683                     int indx = readIntArg(byteCodes, i);

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

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

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

   687                     i += 2;

   688                     addReference(fi[0]);

   689                     break;

   690                 }

   691                 case opc_putstatic: {

   692                     int indx = readIntArg(byteCodes, i);

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

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

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

   696                     i += 2;

   697                     addReference(fi[0]);

   698                     break;

   699                 }

   700                 case opc_putfield: {

   701                     int indx = readIntArg(byteCodes, i);

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

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

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

   705                     i += 2;

   706                     break;

   707                 }

   708                 case opc_checkcast: {

   709                     int indx = readIntArg(byteCodes, i);

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

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

   712                         // no way to check arrays right now

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

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

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

   716                     }

   717                     i += 2;

   718                     break;

   719                 }

   720                 case opc_instanceof: {

   721                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   726                     i += 2;

   727                     break;

   728                 }

   729                 case opc_athrow: {

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

   731                     break;

   732                 }

   733                 default: {

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

   735                 }

   737             }

   738             out.append(" //");

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

   740                 out.append(" ");

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

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

   743             }

   744             out.append("\n");

   745         }

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

   747     }

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

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

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

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

   753         return i + 2;

   754     }

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

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

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

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

   760     }

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

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

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

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

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

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

   767     }

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

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

   770     }

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

   773         int i = 0;

   774         Boolean count = null;

   775         boolean array = false;

   776         int firstPos = sig.length();

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

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

   779             switch (ch) {

   780                 case '(':

   781                     count = true;

   782                     continue;

   783                 case ')':

   784                     count = false;

   785                     continue;

   786                 case 'A':

   787                     array = true;

   788                     break;

   789                 case 'B':

   790                 case 'C':

   791                 case 'D':

   792                 case 'F':

   793                 case 'I':

   794                 case 'J':

   795                 case 'S':

   796                 case 'Z':

   797                     if (count) {

   798                         if (array) {

   799                             sig.append('A');

   800                         }

   801                         sig.append(ch);

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

   803                             cnt.append('1');

   804                         } else {

   805                             cnt.append('0');

   806                         }

   807                     } else {

   808                         hasReturnType[0] = true;

   809                         sig.insert(firstPos, ch);

   810                         if (array) {

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

   812                         }

   813                     }

   814                     array = false;

   815                     continue;

   816                 case 'V':

   817                     assert !count;

   818                     hasReturnType[0] = false;

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

   820                     continue;

   821                 case 'L':

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

   823                     if (count) {

   824                         if (array) {

   825                             sig.append('A');

   826                         }

   827                         sig.append(ch);

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

   829                         cnt.append('0');

   830                     } else {

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

   832                         sig.insert(firstPos, ch);

   833                         if (array) {

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

   835                         }

   836                         hasReturnType[0] = true;

   837                     }

   838                     i = next + 1;

   839                     continue;

   840                 case '[':

   841                     //arrays++;

   842                     continue;

   843                 default:

   844                     break; // invalid character

   845             }

   846         }

   847     }

   849     private void generateStaticField(FieldData v) throws IOException {

   850         out.append("\n  ")

   851            .append(className(jc))

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

   853     }

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

   856         StringBuilder name = new StringBuilder();

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

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

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

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

   861         } else {

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

   863         }

   865         boolean hasReturn[] = { false };

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

   867         return name.toString();

   868     }

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

   871         StringBuilder name = new StringBuilder();

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

   873         String nm= mi[1];

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

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

   876         } else {

   877             name.append(nm);

   878         }

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

   880         return name.toString();

   881     }

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

   884     throws IOException {

   885         int methodIndex = readIntArg(byteCodes, i);

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

   887         boolean[] hasReturn = { false };

   888         StringBuilder cnt = new StringBuilder();

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

   890         out.append("{ ");

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

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

   893         }

   895         if (hasReturn[0]) {

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

   897         }

   898         final String in = mi[0];

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

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

   901         out.append(mn);

   902         out.append('(');

   903         String sep = "";

   904         if (!isStatic) {

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

   906             sep = ", ";

   907         }

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

   909             out.append(sep);

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

   911             sep = ", ";

   912         }

   913         out.append(")");

   914         if (hasReturn[0]) {

   915             out.append(")");

   916         }

   917         out.append("; }");

   918         i += 2;

   919         addReference(in);

   920         return i;

   921     }

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

   923     throws IOException {

   924         int methodIndex = readIntArg(byteCodes, i);

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

   926         boolean[] hasReturn = { false };

   927         StringBuilder cnt = new StringBuilder();

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

   929         out.append("{ ");

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

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

   932         }

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

   934         if (hasReturn[0]) {

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

   936         }

   937         out.append("self.");

   938         out.append(mn);

   939         out.append('(');

   940         out.append("self");

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

   942             out.append(", ");

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

   944         }

   945         out.append(")");

   946         if (hasReturn[0]) {

   947             out.append(")");

   948         }

   949         out.append("; }");

   950         i += 2;

   951         return i;

   952     }

   954     private void addReference(String cn) throws IOException {

   955         if (requireReference(cn)) {

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

   957         }

   958     }

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

   961         int arr = 0;

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

   963             out.append('A');

   964             d = d.substring(1);

   965         }

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

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

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

   969         } else {

   970             out.append(d);

   971         }

   972     }

   974     private String encodeConstant(int entryIndex) {

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

   976         return s;

   977     }

   979     private String findDescriptor(String d) {

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

   981     }

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

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

   985         if (arr == null) {

   986             return false;

   987         }

   988         final String jvmType = "L" + JavaScriptBody.class.getName().replace('.', '/') + ";";

   989         class P extends AnnotationParser {

   990             int cnt;

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

   992             String body;

   994             @Override

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

   996                 if (type.equals(jvmType)) {

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

   998                         body = value;

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

  1000                         args[cnt++] = value;

  1001                     } else {

  1002                         throw new IllegalArgumentException(attr);

  1003                     }

  1004                 }

  1005             }

  1006         }

  1007         P p = new P();

  1008         p.parse(arr, jc);

  1009         if (p.body == null) {

  1010             return false;

  1011         }

  1012         StringBuilder cnt = new StringBuilder();

  1013         out.append("\nfunction ").append(className(jc)).append('_').

  1014             append(findMethodName(m, cnt));

  1015         out.append("(");

  1016         String space;

  1017         int index;

  1018         if (!isStatic) {

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

  1020             space = ",";

  1021             index = 1;

  1022         } else {

  1023             space = "";

  1024             index = 0;

  1025         }

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

  1027             out.append(space);

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

  1029             index++;

  1030             space = ",";

  1031         }

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

  1033         out.append(p.body);

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

  1035         return true;

  1036     }

  1037     private static String className(ClassData jc) {

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

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

  1040     }

  1042     private static String[] findAnnotation(

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

  1044         final String... attrNames

  1045     ) throws IOException {

  1046         if (arr == null) {

  1047             return null;

  1048         }

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

  1050         final boolean[] found = { false };

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

  1052         AnnotationParser ap = new AnnotationParser() {

  1053             @Override

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

  1055                 if (type.equals(jvmType)) {

  1056                     found[0] = true;

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

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

  1059                             values[i] = value;

  1060                         }

  1061                     }

  1062                 }

  1063             }

  1065         };

  1066         ap.parse(arr, cd);

  1067         return found[0] ? values : null;

  1068     }

  1070     private CharSequence initField(FieldData v) {

  1071         final String is = v.getInternalSig();

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

  1073             switch (is.charAt(0)) {

  1074                 case 'S':

  1075                 case 'J':

  1076                 case 'B':

  1077                 case 'Z':

  1078                 case 'C':

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

  1080                 case 'F':

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

  1082                 default:

  1083                     throw new IllegalStateException(is);

  1084             }

  1085         }

  1086         return " = null;";

  1087     }

  1088 }

author	Jaroslav Tulach <jtulach@netbeans.org>
	Wed, 21 Nov 2012 21:03:10 +0100
changeset 191	c18c3df35966
parent 190	6060d43a323a
child 200	227bafe6ef52
child 221	3ee23267706c
permissions	-rw-r--r--