hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@2cda429aeb49

     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.AnnotationParser;

    28 import sun.tools.javap.ClassData;

    29 import sun.tools.javap.FieldData;

    30 import sun.tools.javap.MethodData;

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

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

    34  *

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

    36  */

    37 public final class ByteCodeToJavaScript {

    38     private final ClassData jc;

    39     private final Appendable out;

    40     private final Collection<? super String> references;

    42     private ByteCodeToJavaScript(

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

    44     ) {

    45         this.jc = jc;

    46         this.out = out;

    47         this.references = references;

    48     }

    50     /**

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

    52      *

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

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

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

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

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

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

    59      *   if one is not interested in knowing references

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

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

    62      *

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

    64      */

    66     public static String compile(

    67         InputStream classFile, Appendable out,

    68         Collection<? super String> references,

    69         Collection<? super String> scripts

    70     ) throws IOException {

    71         ClassData jc = new ClassData(classFile);

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

    73         String[] arr = findAnnotation(arrData, jc, ExtraJavaScript.class.getName(), "resource", "processByteCode");

    74         if (arr != null) {

    75             scripts.add(arr[0]);

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

    77                 return null;

    78             }

    79         }

    80         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

    81             jc, out, references

    82         );

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

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

    85             if (m.isStatic()) {

    86                 compiler.generateStaticMethod(m, toInitilize);

    87             } else {

    88                 compiler.generateInstanceMethod(m);

    89             }

    90         }

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

    92             if (v.isStatic()) {

    93                 compiler.generateStaticField(v);

    94             }

    95         }

    97         final String className = className(jc);

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

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

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

   101             if (!v.isStatic()) {

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

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

   104             }

   105         }

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

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

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

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

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

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

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

   113         if (sc != null) {

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

   115                .append(".prototype = ").

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

   117         } else {

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

   119         }

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

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

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

   123             }

   124         }

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

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

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

   128         }

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

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

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

   132         StringBuilder sb = new StringBuilder();

   133         for (String init : toInitilize) {

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

   135         }

   136         return sb.toString();

   137     }

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

   139         if (javaScriptBody(m, true)) {

   140             return;

   141         }

   142         int[] argsCnt = { -1 };

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

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

   145             className(jc)

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

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

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

   149         }

   150         out.append('(');

   151         String space = "";

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

   153             out.append(space);

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

   155             space = ",";

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

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

   158                 index += 2;

   159             } else {

   160                 index++;

   161             }

   162         }

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

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

   165         if (code != null) {

   166             int len = m.getMaxLocals();

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

   168                 out.append("  var ");

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

   170             }

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

   172             produceCode(code);

   173         } else {

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

   175         }

   176         out.append("}");

   177     }

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

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

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

   182            .append(className(jc))

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

   184     }

   186     private void generateInstanceMethod(MethodData m) throws IOException {

   187         if (javaScriptBody(m, false)) {

   188             return;

   189         }

   190         int[] argsCnt = { -1 };

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

   192             className(jc)

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

   194         out.append("(arg0");

   195         String space = ",";

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

   197             out.append(space);

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

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

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

   201                 index += 2;

   202             } else {

   203                 index++;

   204             }

   205         }

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

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

   208         if (code != null) {

   209             int len = m.getMaxLocals();

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

   211                 out.append("  var ");

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

   213             }

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

   215             produceCode(code);

   216         } else {

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

   218         }

   219         out.append("}");

   220     }

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

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

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

   225             int prev = i;

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

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

   228             switch (c) {

   229                 case opc_aload_0:

   230                 case opc_iload_0:

   231                 case opc_lload_0:

   232                 case opc_fload_0:

   233                 case opc_dload_0:

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

   235                     break;

   236                 case opc_aload_1:

   237                 case opc_iload_1:

   238                 case opc_lload_1:

   239                 case opc_fload_1:

   240                 case opc_dload_1:

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

   242                     break;

   243                 case opc_aload_2:

   244                 case opc_iload_2:

   245                 case opc_lload_2:

   246                 case opc_fload_2:

   247                 case opc_dload_2:

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

   249                     break;

   250                 case opc_aload_3:

   251                 case opc_iload_3:

   252                 case opc_lload_3:

   253                 case opc_fload_3:

   254                 case opc_dload_3:

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

   256                     break;

   257                 case opc_iload:

   258                 case opc_lload:

   259                 case opc_fload:

   260                 case opc_dload:

   261                 case opc_aload: {

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

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

   264                     break;

   265                 }

   266                 case opc_istore:

   267                 case opc_lstore:

   268                 case opc_fstore:

   269                 case opc_dstore:

   270                 case opc_astore: {

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

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

   273                     break;

   274                 }

   275                 case opc_astore_0:

   276                 case opc_istore_0:

   277                 case opc_lstore_0:

   278                 case opc_fstore_0:

   279                 case opc_dstore_0:

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

   281                     break;

   282                 case opc_astore_1:

   283                 case opc_istore_1:

   284                 case opc_lstore_1:

   285                 case opc_fstore_1:

   286                 case opc_dstore_1:

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

   288                     break;

   289                 case opc_astore_2:

   290                 case opc_istore_2:

   291                 case opc_lstore_2:

   292                 case opc_fstore_2:

   293                 case opc_dstore_2:

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

   295                     break;

   296                 case opc_astore_3:

   297                 case opc_istore_3:

   298                 case opc_lstore_3:

   299                 case opc_fstore_3:

   300                 case opc_dstore_3:

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

   302                     break;

   303                 case opc_iadd:

   304                 case opc_ladd:

   305                 case opc_fadd:

   306                 case opc_dadd:

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

   308                     break;

   309                 case opc_isub:

   310                 case opc_lsub:

   311                 case opc_fsub:

   312                 case opc_dsub:

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

   314                     break;

   315                 case opc_imul:

   316                 case opc_lmul:

   317                 case opc_fmul:

   318                 case opc_dmul:

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

   320                     break;

   321                 case opc_idiv:

   322                 case opc_ldiv:

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

   324                     break;

   325                 case opc_fdiv:

   326                 case opc_ddiv:

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

   328                     break;

   329                 case opc_iand:

   330                 case opc_land:

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

   332                     break;

   333                 case opc_ior:

   334                 case opc_lor:

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

   336                     break;

   337                 case opc_ixor:

   338                 case opc_lxor:

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

   340                     break;

   341                 case opc_ineg:

   342                 case opc_lneg:

   343                 case opc_fneg:

   344                 case opc_dneg:

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

   346                     break;

   347                 case opc_ishl:

   348                 case opc_lshl:

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

   350                     break;

   351                 case opc_ishr:

   352                 case opc_lshr:

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

   354                     break;

   355                 case opc_iushr:

   356                 case opc_lushr:

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

   358                     break;

   359                 case opc_iinc: {

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

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

   362                     if (incrBy == 1) {

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

   364                     } else {

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

   366                     }

   367                     break;

   368                 }

   369                 case opc_return:

   370                     out.append("return;");

   371                     break;

   372                 case opc_ireturn:

   373                 case opc_lreturn:

   374                 case opc_freturn:

   375                 case opc_dreturn:

   376                 case opc_areturn:

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

   378                     break;

   379                 case opc_i2l:

   380                 case opc_i2f:

   381                 case opc_i2d:

   382                 case opc_l2i:

   383                     // max int check?

   384                 case opc_l2f:

   385                 case opc_l2d:

   386                 case opc_f2d:

   387                 case opc_d2f:

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

   389                     break;

   390                 case opc_f2i:

   391                 case opc_f2l:

   392                 case opc_d2i:

   393                 case opc_d2l:

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

   395                     break;

   396                 case opc_i2b:

   397                 case opc_i2c:

   398                 case opc_i2s:

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

   400                     break;

   401                 case opc_aconst_null:

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

   403                     break;

   404                 case opc_iconst_m1:

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

   406                     break;

   407                 case opc_iconst_0:

   408                 case opc_dconst_0:

   409                 case opc_lconst_0:

   410                 case opc_fconst_0:

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

   412                     break;

   413                 case opc_iconst_1:

   414                 case opc_lconst_1:

   415                 case opc_fconst_1:

   416                 case opc_dconst_1:

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

   418                     break;

   419                 case opc_iconst_2:

   420                 case opc_fconst_2:

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

   422                     break;

   423                 case opc_iconst_3:

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

   425                     break;

   426                 case opc_iconst_4:

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

   428                     break;

   429                 case opc_iconst_5:

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

   431                     break;

   432                 case opc_ldc: {

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

   434                     String v = encodeConstant(indx);

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

   436                     break;

   437                 }

   438                 case opc_ldc_w:

   439                 case opc_ldc2_w: {

   440                     int indx = readIntArg(byteCodes, i);

   441                     i += 2;

   442                     String v = encodeConstant(indx);

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

   444                     break;

   445                 }

   446                 case opc_lcmp:

   447                 case opc_fcmpl:

   448                 case opc_fcmpg:

   449                 case opc_dcmpl:

   450                 case opc_dcmpg: {

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

   452                     break;

   453                 }

   454                 case opc_if_acmpeq:

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

   456                     break;

   457                 case opc_if_acmpne:

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

   459                     break;

   460                 case opc_if_icmpeq: {

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

   462                     break;

   463                 }

   464                 case opc_ifeq: {

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

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

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

   468                     i += 2;

   469                     break;

   470                 }

   471                 case opc_ifne: {

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

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

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

   475                     i += 2;

   476                     break;

   477                 }

   478                 case opc_iflt: {

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

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

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

   482                     i += 2;

   483                     break;

   484                 }

   485                 case opc_ifle: {

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

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

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

   489                     i += 2;

   490                     break;

   491                 }

   492                 case opc_ifgt: {

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

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

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

   496                     i += 2;

   497                     break;

   498                 }

   499                 case opc_ifge: {

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

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

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

   503                     i += 2;

   504                     break;

   505                 }

   506                 case opc_ifnonnull: {

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

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

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

   510                     i += 2;

   511                     break;

   512                 }

   513                 case opc_ifnull: {

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

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

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

   517                     i += 2;

   518                     break;

   519                 }

   520                 case opc_if_icmpne:

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

   522                     break;

   523                 case opc_if_icmplt:

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

   525                     break;

   526                 case opc_if_icmple:

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

   528                     break;

   529                 case opc_if_icmpgt:

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

   531                     break;

   532                 case opc_if_icmpge:

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

   534                     break;

   535                 case opc_goto: {

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

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

   538                     i += 2;

   539                     break;

   540                 }

   541                 case opc_lookupswitch: {

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

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

   544                     table += 4;

   545                     int n = readInt4(byteCodes, table);

   546                     table += 4;

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

   548                     while (n-- > 0) {

   549                         int cnstnt = readInt4(byteCodes, table);

   550                         table += 4;

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

   552                         table += 4;

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

   554                     }

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

   556                     i = table - 1;

   557                     break;

   558                 }

   559                 case opc_tableswitch: {

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

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

   562                     table += 4;

   563                     int low = readInt4(byteCodes, table);

   564                     table += 4;

   565                     int high = readInt4(byteCodes, table);

   566                     table += 4;

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

   568                     while (low <= high) {

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

   570                         table += 4;

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

   572                         low++;

   573                     }

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

   575                     i = table - 1;

   576                     break;

   577                 }

   578                 case opc_invokeinterface: {

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

   580                     break;

   581                 }

   582                 case opc_invokevirtual:

   583                     i = invokeVirtualMethod(byteCodes, i);

   584                     break;

   585                 case opc_invokespecial:

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

   587                     break;

   588                 case opc_invokestatic:

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

   590                     break;

   591                 case opc_new: {

   592                     int indx = readIntArg(byteCodes, i);

   593                     String ci = jc.getClassName(indx);

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

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

   596                     out.append(");");

   597                     addReference(ci);

   598                     i += 2;

   599                     break;

   600                 }

   601                 case opc_newarray: {

   602                     int type = byteCodes[i++];

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

   604                     break;

   605                 }

   606                 case opc_anewarray: {

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

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

   609                     break;

   610                 }

   611                 case opc_multianewarray: {

   612                     i += 2;

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

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

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

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

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

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

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

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

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

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

   623                             append(";");

   624                     }

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

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

   627                     }

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

   629                     break;

   630                 }

   631                 case opc_arraylength:

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

   633                     break;

   634                 case opc_iastore:

   635                 case opc_lastore:

   636                 case opc_fastore:

   637                 case opc_dastore:

   638                 case opc_aastore:

   639                 case opc_bastore:

   640                 case opc_castore:

   641                 case opc_sastore: {

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

   643                     break;

   644                 }

   645                 case opc_iaload:

   646                 case opc_laload:

   647                 case opc_faload:

   648                 case opc_daload:

   649                 case opc_aaload:

   650                 case opc_baload:

   651                 case opc_caload:

   652                 case opc_saload: {

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

   654                     break;

   655                 }

   656                 case opc_pop2:

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

   658                 case opc_pop:

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

   660                     break;

   661                 case opc_dup:

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

   663                     break;

   664                 case opc_bipush:

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

   666                     break;

   667                 case opc_sipush:

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

   669                     i += 2;

   670                     break;

   671                 case opc_getfield: {

   672                     int indx = readIntArg(byteCodes, i);

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

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

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

   676                     i += 2;

   677                     break;

   678                 }

   679                 case opc_getstatic: {

   680                     int indx = readIntArg(byteCodes, i);

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

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

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

   684                     i += 2;

   685                     addReference(fi[0]);

   686                     break;

   687                 }

   688                 case opc_putstatic: {

   689                     int indx = readIntArg(byteCodes, i);

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

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

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

   693                     i += 2;

   694                     addReference(fi[0]);

   695                     break;

   696                 }

   697                 case opc_putfield: {

   698                     int indx = readIntArg(byteCodes, i);

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

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

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

   702                     i += 2;

   703                     break;

   704                 }

   705                 case opc_checkcast: {

   706                     int indx = readIntArg(byteCodes, i);

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

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

   709                         // no way to check arrays right now

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

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

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

   713                     }

   714                     i += 2;

   715                     break;

   716                 }

   717                 case opc_instanceof: {

   718                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   723                     i += 2;

   724                     break;

   725                 }

   726                 case opc_athrow: {

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

   728                     break;

   729                 }

   730                 default: {

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

   732                 }

   734             }

   735             out.append(" //");

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

   737                 out.append(" ");

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

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

   740             }

   741             out.append("\n");

   742         }

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

   744     }

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

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

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

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

   750         return i + 2;

   751     }

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

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

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

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

   757     }

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

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

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

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

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

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

   764     }

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

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

   767     }

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

   770         int cnt = 0;

   771         int i = 0;

   772         Boolean count = null;

   773         boolean array = false;

   774         int firstPos = sig.length();

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

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

   777             switch (ch) {

   778                 case '(':

   779                     count = true;

   780                     continue;

   781                 case ')':

   782                     count = false;

   783                     continue;

   784                 case 'A':

   785                     array = true;

   786                     break;

   787                 case 'B':

   788                 case 'C':

   789                 case 'D':

   790                 case 'F':

   791                 case 'I':

   792                 case 'J':

   793                 case 'S':

   794                 case 'Z':

   795                     if (count) {

   796                         cnt++;

   797                         if (array) {

   798                             sig.append('A');

   799                         }

   800                         sig.append(ch);

   801                     } else {

   802                         hasReturnType[0] = true;

   803                         sig.insert(firstPos, ch);

   804                         if (array) {

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

   806                         }

   807                     }

   808                     array = false;

   809                     continue;

   810                 case 'V':

   811                     assert !count;

   812                     hasReturnType[0] = false;

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

   814                     continue;

   815                 case 'L':

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

   817                     if (count) {

   818                         cnt++;

   819                         if (array) {

   820                             sig.append('A');

   821                         }

   822                         sig.append(ch);

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

   824                     } else {

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

   826                         sig.insert(firstPos, ch);

   827                         if (array) {

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

   829                         }

   830                         hasReturnType[0] = true;

   831                     }

   832                     i = next + 1;

   833                     continue;

   834                 case '[':

   835                     //arrays++;

   836                     continue;

   837                 default:

   838                     break; // invalid character

   839             }

   840         }

   841         return cnt;

   842     }

   844     private void generateStaticField(FieldData v) throws IOException {

   845         out.append("\nvar ")

   846            .append(className(jc))

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

   848     }

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

   851         StringBuilder name = new StringBuilder();

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

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

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

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

   856         } else {

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

   858         }

   860         boolean hasReturn[] = { false };

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

   862         if (cnt != null) {

   863             cnt[0] = argsCnt;

   864         }

   865         return name.toString();

   866     }

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

   869         StringBuilder name = new StringBuilder();

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

   871         String nm= mi[1];

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

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

   874         } else {

   875             name.append(nm);

   876         }

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

   878         return name.toString();

   879     }

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

   882     throws IOException {

   883         int methodIndex = readIntArg(byteCodes, i);

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

   885         boolean[] hasReturn = { false };

   886         int[] cnt = { 0 };

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

   888         out.append("{ ");

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

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

   891         }

   893         if (hasReturn[0]) {

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

   895         }

   896         final String in = mi[0];

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

   898         if (isStatic) {

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

   900         } else {

   901             out.append('_');

   902         }

   903         out.append(mn);

   904         out.append('(');

   905         String sep = "";

   906         if (!isStatic) {

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

   908             sep = ", ";

   909         }

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

   911             out.append(sep);

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

   913             sep = ", ";

   914         }

   915         out.append(")");

   916         if (hasReturn[0]) {

   917             out.append(")");

   918         }

   919         out.append("; }");

   920         i += 2;

   921         addReference(in);

   922         return i;

   923     }

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

   925     throws IOException {

   926         int methodIndex = readIntArg(byteCodes, i);

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

   928         boolean[] hasReturn = { false };

   929         int[] cnt = { 0 };

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

   931         out.append("{ ");

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

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

   934         }

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

   936         if (hasReturn[0]) {

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

   938         }

   939         out.append("self.");

   940         out.append(mn);

   941         out.append('(');

   942         out.append("self");

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

   944             out.append(", ");

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

   946         }

   947         out.append(")");

   948         if (hasReturn[0]) {

   949             out.append(")");

   950         }

   951         out.append("; }");

   952         i += 2;

   953         return i;

   954     }

   956     private void addReference(String cn) throws IOException {

   957         if (references != null) {

   958             if (references.add(cn)) {

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

   960             }

   961         }

   962     }

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

   965         int arr = 0;

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

   967             out.append('A');

   968             d = d.substring(1);

   969         }

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

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

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

   973         } else {

   974             out.append(d);

   975         }

   976     }

   978     private String encodeConstant(int entryIndex) {

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

   980         return s;

   981     }

   983     private String findDescriptor(String d) {

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

   985     }

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

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

   989         if (arr == null) {

   990             return false;

   991         }

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

   993         class P extends AnnotationParser {

   994             int cnt;

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

   996             String body;

   998             @Override

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

  1000                 if (type.equals(jvmType)) {

  1001                     if ("body".equals(attr)) {

  1002                         body = value;

  1003                     } else if ("args".equals(attr)) {

  1004                         args[cnt++] = value;

  1005                     } else {

  1006                         throw new IllegalArgumentException(attr);

  1007                     }

  1008                 }

  1009             }

  1010         }

  1011         P p = new P();

  1012         p.parse(arr, jc);

  1013         if (p.body == null) {

  1014             return false;

  1015         }

  1016         int argsCnt[] = { -1 };

  1017         out.append("\nfunction ").append(className(jc)).append('_').

  1018             append(findMethodName(m, argsCnt));

  1019         out.append("(");

  1020         String space;

  1021         int index;

  1022         if (!isStatic) {

  1023             out.append(p.args[0]);

  1024             space = ",";

  1025             index = 1;

  1026         } else {

  1027             space = "";

  1028             index = 0;

  1029         }

  1030         for (int i = 0; i < argsCnt[0]; i++) {

  1031             out.append(space);

  1032             out.append(p.args[index]);

  1033             index++;

  1034             space = ",";

  1035         }

  1036         out.append(") {").append("\n");

  1037         out.append(p.body);

  1038         out.append("\n}\n");

  1039         return true;

  1040     }

  1041     private static String className(ClassData jc) {

  1042         //return jc.getName().getInternalName().replace('/', '_');

  1043         return jc.getClassName().replace('/', '_');

  1044     }

  1046     private static String[] findAnnotation(

  1047         byte[] arr, ClassData cd, final String className,

  1048         final String... attrNames

  1049     ) throws IOException {

  1050         if (arr == null) {

  1051             return null;

  1052         }

  1053         final String[] values = new String[attrNames.length];

  1054         final boolean[] found = { false };

  1055         final String jvmType = "L" + className.replace('.', '/') + ";";

  1056         AnnotationParser ap = new AnnotationParser() {

  1057             @Override

  1058             protected void visitAttr(String type, String attr, String value) {

  1059                 if (type.equals(jvmType)) {

  1060                     found[0] = true;

  1061                     for (int i = 0; i < attrNames.length; i++) {

  1062                         if (attrNames[i].equals(attr)) {

  1063                             values[i] = value;

  1064                         }

  1065                     }

  1066                 }

  1067             }

  1069         };

  1070         ap.parse(arr, cd);

  1071         return found[0] ? values : null;

  1072     }

  1073 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Mon, 12 Nov 2012 00:07:34 +0100
branch	javap
changeset 152	2cda429aeb49
parent 151	40f95fe90cdc
child 156	3bb1a148a795
permissions	-rw-r--r--