hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@40f95fe90cdc

     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 java.util.ArrayList;

    23 import java.util.Collection;

    24 import java.util.List;

    25 import org.apidesign.bck2brwsr.core.ExtraJavaScript;

    26 import org.apidesign.bck2brwsr.core.JavaScriptBody;

    27 import sun.tools.javap.ClassData;

    28 import sun.tools.javap.FieldData;

    29 import sun.tools.javap.MethodData;

    30 import static sun.tools.javap.RuntimeConstants.*;

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

    33  *

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

    35  */

    36 public final class ByteCodeToJavaScript {

    37     private final ClassData jc;

    38     private final Appendable out;

    39     private final Collection<? super String> references;

    41     private ByteCodeToJavaScript(

    42         ClassData jc, Appendable out, Collection<? super String> references

    43     ) {

    44         this.jc = jc;

    45         this.out = out;

    46         this.references = references;

    47     }

    49     /**

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

    51      *

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

    53      * @param out a {@link StringBuilder} or similar to generate the output to

    54      * @param references a write only collection where the system adds list of

    55      *   other classes that were referenced and should be loaded in order the

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

    57      *   JVM form so String is <code>java/lang/String</code>. Can be <code>null</code>

    58      *   if one is not interested in knowing references

    59      * @param scripts write only collection with names of resources to read

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

    61      *

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

    63      */

    65     public static String compile(

    66         InputStream classFile, Appendable out,

    67         Collection<? super String> references,

    68         Collection<? super String> scripts

    69     ) throws IOException {

    70         ClassData jc = new ClassData(classFile);

    71         /*

    72         final ClassName extraAnn = ClassName.getClassName(ExtraJavaScript.class.getName().replace('.', '/'));

    73         Annotation a = jc.getAnnotation(extraAnn);

    74         if (a != null) {

    75             final ElementValue annVal = a.getComponent("resource").getValue();

    76             String res = ((PrimitiveElementValue)annVal).getValue().getValue().toString();

    77             scripts.add(res);

    78             final AnnotationComponent process = a.getComponent("processByteCode");

    79             if (process != null && "const=0".equals(process.getValue().toString())) {

    80                 return null;

    81             }

    82         }

    83         */

    84         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

    85             jc, out, references

    86         );

    87         List<String> toInitilize = new ArrayList<String>();

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

    89             if (m.isStatic()) {

    90                 compiler.generateStaticMethod(m, toInitilize);

    91             } else {

    92                 compiler.generateInstanceMethod(m);

    93             }

    94         }

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

    96             if (v.isStatic()) {

    97                 compiler.generateStaticField(v);

    98             }

    99         }

   101         final String className = className(jc);

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

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

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

   105             if (!v.isStatic()) {

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

   107                     append(v.getName()).append(" = 0;");

   108             }

   109         }

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

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

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

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

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

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

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

   117         if (sc != null) {

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

   119                .append(".prototype = ").

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

   121         } else {

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

   123         }

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

   125             if (!m.getName().contains("<init>") && !m.getName().contains("<cinit>")) {

   126                 compiler.generateMethodReference("\n  p.", m);

   127             }

   128         }

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

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

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

   132         }

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

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

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

   136         StringBuilder sb = new StringBuilder();

   137         for (String init : toInitilize) {

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

   139         }

   140         return sb.toString();

   141     }

   142     private void generateStaticMethod(MethodData m, List<String> toInitilize) throws IOException {

   143         if (javaScriptBody(m, true)) {

   144             return;

   145         }

   146         int[] argsCnt = { -1 };

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

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

   149             className(jc)

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

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

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

   153         }

   154         out.append('(');

   155         String space = "";

   156         for (int index = 0, i = 0; i < argsCnt[0]; i++) {

   157             out.append(space);

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

   159             space = ",";

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

   161             if ("D".equals(desc) || "J".equals(desc)) {

   162                 index += 2;

   163             } else {

   164                 index++;

   165             }

   166         }

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

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

   169         if (code != null) {

   170             int len = m.getMaxLocals();

   171             for (int index = argsCnt[0], i = argsCnt[0]; i < len; i++) {

   172                 out.append("  var ");

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

   174             }

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

   176             produceCode(code);

   177         } else {

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

   179         }

   180         out.append("}");

   181     }

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

   184         final String name = findMethodName(m, null);

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

   186            .append(className(jc))

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

   188     }

   190     private void generateInstanceMethod(MethodData m) throws IOException {

   191         if (javaScriptBody(m, false)) {

   192             return;

   193         }

   194         int[] argsCnt = { -1 };

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

   196             className(jc)

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

   198         out.append("(arg0");

   199         String space = ",";

   200         for (int index = 1, i = 0; i < argsCnt[0]; i++) {

   201             out.append(space);

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

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

   204             if ("D".equals(desc) || "J".equals(desc)) {

   205                 index += 2;

   206             } else {

   207                 index++;

   208             }

   209         }

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

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

   212         if (code != null) {

   213             int len = m.getMaxLocals();

   214             for (int index = argsCnt[0], i = argsCnt[0]; i < len; i++) {

   215                 out.append("  var ");

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

   217             }

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

   219             produceCode(code);

   220         } else {

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

   222         }

   223         out.append("}");

   224     }

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

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

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

   229             int prev = i;

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

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

   232             switch (c) {

   233                 case opc_aload_0:

   234                 case opc_iload_0:

   235                 case opc_lload_0:

   236                 case opc_fload_0:

   237                 case opc_dload_0:

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

   239                     break;

   240                 case opc_aload_1:

   241                 case opc_iload_1:

   242                 case opc_lload_1:

   243                 case opc_fload_1:

   244                 case opc_dload_1:

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

   246                     break;

   247                 case opc_aload_2:

   248                 case opc_iload_2:

   249                 case opc_lload_2:

   250                 case opc_fload_2:

   251                 case opc_dload_2:

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

   253                     break;

   254                 case opc_aload_3:

   255                 case opc_iload_3:

   256                 case opc_lload_3:

   257                 case opc_fload_3:

   258                 case opc_dload_3:

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

   260                     break;

   261                 case opc_iload:

   262                 case opc_lload:

   263                 case opc_fload:

   264                 case opc_dload:

   265                 case opc_aload: {

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

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

   268                     break;

   269                 }

   270                 case opc_istore:

   271                 case opc_lstore:

   272                 case opc_fstore:

   273                 case opc_dstore:

   274                 case opc_astore: {

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

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

   277                     break;

   278                 }

   279                 case opc_astore_0:

   280                 case opc_istore_0:

   281                 case opc_lstore_0:

   282                 case opc_fstore_0:

   283                 case opc_dstore_0:

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

   285                     break;

   286                 case opc_astore_1:

   287                 case opc_istore_1:

   288                 case opc_lstore_1:

   289                 case opc_fstore_1:

   290                 case opc_dstore_1:

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

   292                     break;

   293                 case opc_astore_2:

   294                 case opc_istore_2:

   295                 case opc_lstore_2:

   296                 case opc_fstore_2:

   297                 case opc_dstore_2:

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

   299                     break;

   300                 case opc_astore_3:

   301                 case opc_istore_3:

   302                 case opc_lstore_3:

   303                 case opc_fstore_3:

   304                 case opc_dstore_3:

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

   306                     break;

   307                 case opc_iadd:

   308                 case opc_ladd:

   309                 case opc_fadd:

   310                 case opc_dadd:

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

   312                     break;

   313                 case opc_isub:

   314                 case opc_lsub:

   315                 case opc_fsub:

   316                 case opc_dsub:

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

   318                     break;

   319                 case opc_imul:

   320                 case opc_lmul:

   321                 case opc_fmul:

   322                 case opc_dmul:

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

   324                     break;

   325                 case opc_idiv:

   326                 case opc_ldiv:

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

   328                     break;

   329                 case opc_fdiv:

   330                 case opc_ddiv:

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

   332                     break;

   333                 case opc_iand:

   334                 case opc_land:

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

   336                     break;

   337                 case opc_ior:

   338                 case opc_lor:

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

   340                     break;

   341                 case opc_ixor:

   342                 case opc_lxor:

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

   344                     break;

   345                 case opc_ineg:

   346                 case opc_lneg:

   347                 case opc_fneg:

   348                 case opc_dneg:

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

   350                     break;

   351                 case opc_ishl:

   352                 case opc_lshl:

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

   354                     break;

   355                 case opc_ishr:

   356                 case opc_lshr:

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

   358                     break;

   359                 case opc_iushr:

   360                 case opc_lushr:

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

   362                     break;

   363                 case opc_iinc: {

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

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

   366                     if (incrBy == 1) {

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

   368                     } else {

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

   370                     }

   371                     break;

   372                 }

   373                 case opc_return:

   374                     out.append("return;");

   375                     break;

   376                 case opc_ireturn:

   377                 case opc_lreturn:

   378                 case opc_freturn:

   379                 case opc_dreturn:

   380                 case opc_areturn:

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

   382                     break;

   383                 case opc_i2l:

   384                 case opc_i2f:

   385                 case opc_i2d:

   386                 case opc_l2i:

   387                     // max int check?

   388                 case opc_l2f:

   389                 case opc_l2d:

   390                 case opc_f2d:

   391                 case opc_d2f:

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

   393                     break;

   394                 case opc_f2i:

   395                 case opc_f2l:

   396                 case opc_d2i:

   397                 case opc_d2l:

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

   399                     break;

   400                 case opc_i2b:

   401                 case opc_i2c:

   402                 case opc_i2s:

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

   404                     break;

   405                 case opc_aconst_null:

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

   407                     break;

   408                 case opc_iconst_m1:

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

   410                     break;

   411                 case opc_iconst_0:

   412                 case opc_dconst_0:

   413                 case opc_lconst_0:

   414                 case opc_fconst_0:

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

   416                     break;

   417                 case opc_iconst_1:

   418                 case opc_lconst_1:

   419                 case opc_fconst_1:

   420                 case opc_dconst_1:

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

   422                     break;

   423                 case opc_iconst_2:

   424                 case opc_fconst_2:

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

   426                     break;

   427                 case opc_iconst_3:

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

   429                     break;

   430                 case opc_iconst_4:

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

   432                     break;

   433                 case opc_iconst_5:

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

   435                     break;

   436                 case opc_ldc: {

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

   438                     String v = encodeConstant(indx);

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

   440                     break;

   441                 }

   442                 case opc_ldc_w:

   443                 case opc_ldc2_w: {

   444                     int indx = readIntArg(byteCodes, i);

   445                     i += 2;

   446                     String v = encodeConstant(indx);

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

   448                     break;

   449                 }

   450                 case opc_lcmp:

   451                 case opc_fcmpl:

   452                 case opc_fcmpg:

   453                 case opc_dcmpl:

   454                 case opc_dcmpg: {

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

   456                     break;

   457                 }

   458                 case opc_if_acmpeq:

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

   460                     break;

   461                 case opc_if_acmpne:

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

   463                     break;

   464                 case opc_if_icmpeq: {

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

   466                     break;

   467                 }

   468                 case opc_ifeq: {

   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_ifne: {

   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_iflt: {

   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_ifle: {

   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_ifgt: {

   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_ifge: {

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

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

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

   507                     i += 2;

   508                     break;

   509                 }

   510                 case opc_ifnonnull: {

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

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

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

   514                     i += 2;

   515                     break;

   516                 }

   517                 case opc_ifnull: {

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

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

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

   521                     i += 2;

   522                     break;

   523                 }

   524                 case opc_if_icmpne:

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

   526                     break;

   527                 case opc_if_icmplt:

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

   529                     break;

   530                 case opc_if_icmple:

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

   532                     break;

   533                 case opc_if_icmpgt:

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

   535                     break;

   536                 case opc_if_icmpge:

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

   538                     break;

   539                 case opc_goto: {

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

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

   542                     i += 2;

   543                     break;

   544                 }

   545                 case opc_lookupswitch: {

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

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

   548                     table += 4;

   549                     int n = readInt4(byteCodes, table);

   550                     table += 4;

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

   552                     while (n-- > 0) {

   553                         int cnstnt = readInt4(byteCodes, table);

   554                         table += 4;

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

   556                         table += 4;

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

   558                     }

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

   560                     i = table - 1;

   561                     break;

   562                 }

   563                 case opc_tableswitch: {

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

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

   566                     table += 4;

   567                     int low = readInt4(byteCodes, table);

   568                     table += 4;

   569                     int high = readInt4(byteCodes, table);

   570                     table += 4;

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

   572                     while (low <= high) {

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

   574                         table += 4;

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

   576                         low++;

   577                     }

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

   579                     i = table - 1;

   580                     break;

   581                 }

   582                 case opc_invokeinterface: {

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

   584                     break;

   585                 }

   586                 case opc_invokevirtual:

   587                     i = invokeVirtualMethod(byteCodes, i);

   588                     break;

   589                 case opc_invokespecial:

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

   591                     break;

   592                 case opc_invokestatic:

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

   594                     break;

   595                 case opc_new: {

   596                     int indx = readIntArg(byteCodes, i);

   597                     String ci = jc.getClassName(indx);

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

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

   600                     out.append(");");

   601                     addReference(ci);

   602                     i += 2;

   603                     break;

   604                 }

   605                 case opc_newarray: {

   606                     int type = byteCodes[i++];

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

   608                     break;

   609                 }

   610                 case opc_anewarray: {

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

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

   613                     break;

   614                 }

   615                 case opc_multianewarray: {

   616                     i += 2;

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

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

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

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

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

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

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

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

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

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

   627                             append(";");

   628                     }

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

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

   631                     }

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

   633                     break;

   634                 }

   635                 case opc_arraylength:

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

   637                     break;

   638                 case opc_iastore:

   639                 case opc_lastore:

   640                 case opc_fastore:

   641                 case opc_dastore:

   642                 case opc_aastore:

   643                 case opc_bastore:

   644                 case opc_castore:

   645                 case opc_sastore: {

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

   647                     break;

   648                 }

   649                 case opc_iaload:

   650                 case opc_laload:

   651                 case opc_faload:

   652                 case opc_daload:

   653                 case opc_aaload:

   654                 case opc_baload:

   655                 case opc_caload:

   656                 case opc_saload: {

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

   658                     break;

   659                 }

   660                 case opc_pop2:

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

   662                 case opc_pop:

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

   664                     break;

   665                 case opc_dup:

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

   667                     break;

   668                 case opc_bipush:

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

   670                     break;

   671                 case opc_sipush:

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

   673                     i += 2;

   674                     break;

   675                 case opc_getfield: {

   676                     int indx = readIntArg(byteCodes, i);

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

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

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

   680                     i += 2;

   681                     break;

   682                 }

   683                 case opc_getstatic: {

   684                     int indx = readIntArg(byteCodes, i);

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

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

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

   688                     i += 2;

   689                     addReference(fi[0]);

   690                     break;

   691                 }

   692                 case opc_putstatic: {

   693                     int indx = readIntArg(byteCodes, i);

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

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

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

   697                     i += 2;

   698                     addReference(fi[0]);

   699                     break;

   700                 }

   701                 case opc_putfield: {

   702                     int indx = readIntArg(byteCodes, i);

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

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

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

   706                     i += 2;

   707                     break;

   708                 }

   709                 case opc_checkcast: {

   710                     int indx = readIntArg(byteCodes, i);

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

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

   713                         // no way to check arrays right now

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

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

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

   717                     }

   718                     i += 2;

   719                     break;

   720                 }

   721                 case opc_instanceof: {

   722                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   727                     i += 2;

   728                     break;

   729                 }

   730                 case opc_athrow: {

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

   732                     break;

   733                 }

   734                 default: {

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

   736                 }

   738             }

   739             out.append(" //");

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

   741                 out.append(" ");

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

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

   744             }

   745             out.append("\n");

   746         }

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

   748     }

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

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

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

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

   754         return i + 2;

   755     }

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

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

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

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

   761     }

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

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

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

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

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

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

   768     }

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

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

   771     }

   773     private static int countArgs(String descriptor, boolean[] hasReturnType, StringBuilder sig) {

   774         int cnt = 0;

   775         int i = 0;

   776         Boolean count = null;

   777         boolean array = false;

   778         int firstPos = sig.length();

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

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

   781             switch (ch) {

   782                 case '(':

   783                     count = true;

   784                     continue;

   785                 case ')':

   786                     count = false;

   787                     continue;

   788                 case 'A':

   789                     array = true;

   790                     break;

   791                 case 'B':

   792                 case 'C':

   793                 case 'D':

   794                 case 'F':

   795                 case 'I':

   796                 case 'J':

   797                 case 'S':

   798                 case 'Z':

   799                     if (count) {

   800                         cnt++;

   801                         if (array) {

   802                             sig.append('A');

   803                         }

   804                         sig.append(ch);

   805                     } else {

   806                         hasReturnType[0] = true;

   807                         sig.insert(firstPos, ch);

   808                         if (array) {

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

   810                         }

   811                     }

   812                     array = false;

   813                     continue;

   814                 case 'V':

   815                     assert !count;

   816                     hasReturnType[0] = false;

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

   818                     continue;

   819                 case 'L':

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

   821                     if (count) {

   822                         cnt++;

   823                         if (array) {

   824                             sig.append('A');

   825                         }

   826                         sig.append(ch);

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

   828                     } else {

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

   830                         sig.insert(firstPos, ch);

   831                         if (array) {

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

   833                         }

   834                         hasReturnType[0] = true;

   835                     }

   836                     i = next + 1;

   837                     continue;

   838                 case '[':

   839                     //arrays++;

   840                     continue;

   841                 default:

   842                     break; // invalid character

   843             }

   844         }

   845         return cnt;

   846     }

   848     private void generateStaticField(FieldData v) throws IOException {

   849         out.append("\nvar ")

   850            .append(className(jc))

   851            .append('_').append(v.getName()).append(" = 0;");

   852     }

   854     private String findMethodName(MethodData m, int[] cnt) {

   855         StringBuilder name = new StringBuilder();

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

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

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

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

   860         } else {

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

   862         }

   864         boolean hasReturn[] = { false };

   865         int argsCnt = countArgs(findDescriptor(m.getInternalSig()), hasReturn, name);

   866         if (cnt != null) {

   867             cnt[0] = argsCnt;

   868         }

   869         return name.toString();

   870     }

   872     private String findMethodName(String[] mi, int[] cnt, boolean[] hasReturn) {

   873         StringBuilder name = new StringBuilder();

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

   875         String nm= mi[1];

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

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

   878         } else {

   879             name.append(nm);

   880         }

   881         cnt[0] = countArgs(findDescriptor(descr), hasReturn, name);

   882         return name.toString();

   883     }

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

   886     throws IOException {

   887         int methodIndex = readIntArg(byteCodes, i);

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

   889         boolean[] hasReturn = { false };

   890         int[] cnt = { 0 };

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

   892         out.append("{ ");

   893         for (int j = cnt[0] - 1; j >= 0; j--) {

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

   895         }

   897         if (hasReturn[0]) {

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

   899         }

   900         final String in = mi[0];

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

   902         if (isStatic) {

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

   904         } else {

   905             out.append('_');

   906         }

   907         out.append(mn);

   908         out.append('(');

   909         String sep = "";

   910         if (!isStatic) {

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

   912             sep = ", ";

   913         }

   914         for (int j = 0; j < cnt[0]; j++) {

   915             out.append(sep);

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

   917             sep = ", ";

   918         }

   919         out.append(")");

   920         if (hasReturn[0]) {

   921             out.append(")");

   922         }

   923         out.append("; }");

   924         i += 2;

   925         addReference(in);

   926         return i;

   927     }

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

   929     throws IOException {

   930         int methodIndex = readIntArg(byteCodes, i);

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

   932         boolean[] hasReturn = { false };

   933         int[] cnt = { 0 };

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

   935         out.append("{ ");

   936         for (int j = cnt[0] - 1; j >= 0; j--) {

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

   938         }

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

   940         if (hasReturn[0]) {

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

   942         }

   943         out.append("self.");

   944         out.append(mn);

   945         out.append('(');

   946         out.append("self");

   947         for (int j = 0; j < cnt[0]; j++) {

   948             out.append(", ");

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

   950         }

   951         out.append(")");

   952         if (hasReturn[0]) {

   953             out.append(")");

   954         }

   955         out.append("; }");

   956         i += 2;

   957         return i;

   958     }

   960     private void addReference(String cn) throws IOException {

   961         if (references != null) {

   962             if (references.add(cn)) {

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

   964             }

   965         }

   966     }

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

   969         int arr = 0;

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

   971             out.append('A');

   972             d = d.substring(1);

   973         }

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

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

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

   977         } else {

   978             out.append(d);

   979         }

   980     }

   982     private String encodeConstant(int entryIndex) {

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

   984         return s;

   985     }

   987     private String findDescriptor(String d) {

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

   989     }

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

   992         return false;

   993         /*

   994         final ClassName extraAnn = ClassName.getClassName(JavaScriptBody.class.getName().replace('.', '/'));

   995         Annotation a = m.getAnnotation(extraAnn);

   996         if (a != null) {

   997             final ElementValue annVal = a.getComponent("body").getValue();

   998             String body = ((PrimitiveElementValue) annVal).getValue().getValue().toString();

  1000             final ArrayElementValue arrVal = (ArrayElementValue) a.getComponent("args").getValue();

  1001             final int len = arrVal.getValues().length;

  1002             String[] names = new String[len];

  1003             for (int i = 0; i < len; i++) {

  1004                 names[i] = ((PrimitiveElementValue) arrVal.getValues()[i]).getValue().getValue().toString();

  1005             }

  1006             out.append("\nfunction ").append(

  1007                 jc.getName().getInternalName().replace('/', '_')).append('_').append(findMethodName(m));

  1008             out.append("(");

  1009             String space;

  1010             int index;

  1011             if (!isStatic) {

  1012                 out.append(names[0]);

  1013                 space = ",";

  1014                 index = 1;

  1015             } else {

  1016                 space = "";

  1017                 index = 0;

  1018             }

  1019             List<Parameter> args = m.getParameters();

  1020             for (int i = 0; i < args.size(); i++) {

  1021                 out.append(space);

  1022                 out.append(names[index]);

  1023                 final String desc = findDescriptor(args.get(i).getDescriptor());

  1024                 index++;

  1025                 space = ",";

  1026             }

  1027             out.append(") {").append("\n");

  1028             out.append(body);

  1029             out.append("\n}\n");

  1030             return true;

  1031         }

  1032         return false;

  1033         */

  1034     }

  1035     private static String className(ClassData jc) {

  1036         //return jc.getName().getInternalName().replace('/', '_');

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

  1038     }

  1039 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sun, 11 Nov 2012 13:23:52 +0100
branch	javap
changeset 151	40f95fe90cdc
parent 137	45184b2f9697
child 152	2cda429aeb49
permissions	-rw-r--r--