hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@3bb1a148a795

     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         StringBuilder argsCnt = new StringBuilder();

   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.length(); 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 (argsCnt.charAt(i) == '1') {

   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.length(), i = argsCnt.length(); 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, new StringBuilder());

   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         StringBuilder argsCnt = new StringBuilder();

   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.length(); i++) {

   197             out.append(space);

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

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

   200                 index += 2;

   201             } else {

   202                 index++;

   203             }

   204         }

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

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

   207         if (code != null) {

   208             int len = m.getMaxLocals();

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

   210                 out.append("  var ");

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

   212             }

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

   214             produceCode(code);

   215         } else {

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

   217         }

   218         out.append("}");

   219     }

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

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

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

   224             int prev = i;

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

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

   227             switch (c) {

   228                 case opc_aload_0:

   229                 case opc_iload_0:

   230                 case opc_lload_0:

   231                 case opc_fload_0:

   232                 case opc_dload_0:

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

   234                     break;

   235                 case opc_aload_1:

   236                 case opc_iload_1:

   237                 case opc_lload_1:

   238                 case opc_fload_1:

   239                 case opc_dload_1:

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

   241                     break;

   242                 case opc_aload_2:

   243                 case opc_iload_2:

   244                 case opc_lload_2:

   245                 case opc_fload_2:

   246                 case opc_dload_2:

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

   248                     break;

   249                 case opc_aload_3:

   250                 case opc_iload_3:

   251                 case opc_lload_3:

   252                 case opc_fload_3:

   253                 case opc_dload_3:

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

   255                     break;

   256                 case opc_iload:

   257                 case opc_lload:

   258                 case opc_fload:

   259                 case opc_dload:

   260                 case opc_aload: {

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

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

   263                     break;

   264                 }

   265                 case opc_istore:

   266                 case opc_lstore:

   267                 case opc_fstore:

   268                 case opc_dstore:

   269                 case opc_astore: {

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

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

   272                     break;

   273                 }

   274                 case opc_astore_0:

   275                 case opc_istore_0:

   276                 case opc_lstore_0:

   277                 case opc_fstore_0:

   278                 case opc_dstore_0:

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

   280                     break;

   281                 case opc_astore_1:

   282                 case opc_istore_1:

   283                 case opc_lstore_1:

   284                 case opc_fstore_1:

   285                 case opc_dstore_1:

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

   287                     break;

   288                 case opc_astore_2:

   289                 case opc_istore_2:

   290                 case opc_lstore_2:

   291                 case opc_fstore_2:

   292                 case opc_dstore_2:

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

   294                     break;

   295                 case opc_astore_3:

   296                 case opc_istore_3:

   297                 case opc_lstore_3:

   298                 case opc_fstore_3:

   299                 case opc_dstore_3:

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

   301                     break;

   302                 case opc_iadd:

   303                 case opc_ladd:

   304                 case opc_fadd:

   305                 case opc_dadd:

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

   307                     break;

   308                 case opc_isub:

   309                 case opc_lsub:

   310                 case opc_fsub:

   311                 case opc_dsub:

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

   313                     break;

   314                 case opc_imul:

   315                 case opc_lmul:

   316                 case opc_fmul:

   317                 case opc_dmul:

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

   319                     break;

   320                 case opc_idiv:

   321                 case opc_ldiv:

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

   323                     break;

   324                 case opc_fdiv:

   325                 case opc_ddiv:

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

   327                     break;

   328                 case opc_iand:

   329                 case opc_land:

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

   331                     break;

   332                 case opc_ior:

   333                 case opc_lor:

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

   335                     break;

   336                 case opc_ixor:

   337                 case opc_lxor:

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

   339                     break;

   340                 case opc_ineg:

   341                 case opc_lneg:

   342                 case opc_fneg:

   343                 case opc_dneg:

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

   345                     break;

   346                 case opc_ishl:

   347                 case opc_lshl:

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

   349                     break;

   350                 case opc_ishr:

   351                 case opc_lshr:

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

   353                     break;

   354                 case opc_iushr:

   355                 case opc_lushr:

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

   357                     break;

   358                 case opc_iinc: {

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

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

   361                     if (incrBy == 1) {

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

   363                     } else {

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

   365                     }

   366                     break;

   367                 }

   368                 case opc_return:

   369                     out.append("return;");

   370                     break;

   371                 case opc_ireturn:

   372                 case opc_lreturn:

   373                 case opc_freturn:

   374                 case opc_dreturn:

   375                 case opc_areturn:

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

   377                     break;

   378                 case opc_i2l:

   379                 case opc_i2f:

   380                 case opc_i2d:

   381                 case opc_l2i:

   382                     // max int check?

   383                 case opc_l2f:

   384                 case opc_l2d:

   385                 case opc_f2d:

   386                 case opc_d2f:

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

   388                     break;

   389                 case opc_f2i:

   390                 case opc_f2l:

   391                 case opc_d2i:

   392                 case opc_d2l:

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

   394                     break;

   395                 case opc_i2b:

   396                 case opc_i2c:

   397                 case opc_i2s:

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

   399                     break;

   400                 case opc_aconst_null:

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

   402                     break;

   403                 case opc_iconst_m1:

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

   405                     break;

   406                 case opc_iconst_0:

   407                 case opc_dconst_0:

   408                 case opc_lconst_0:

   409                 case opc_fconst_0:

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

   411                     break;

   412                 case opc_iconst_1:

   413                 case opc_lconst_1:

   414                 case opc_fconst_1:

   415                 case opc_dconst_1:

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

   417                     break;

   418                 case opc_iconst_2:

   419                 case opc_fconst_2:

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

   421                     break;

   422                 case opc_iconst_3:

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

   424                     break;

   425                 case opc_iconst_4:

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

   427                     break;

   428                 case opc_iconst_5:

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

   430                     break;

   431                 case opc_ldc: {

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

   433                     String v = encodeConstant(indx);

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

   435                     break;

   436                 }

   437                 case opc_ldc_w:

   438                 case opc_ldc2_w: {

   439                     int indx = readIntArg(byteCodes, i);

   440                     i += 2;

   441                     String v = encodeConstant(indx);

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

   443                     break;

   444                 }

   445                 case opc_lcmp:

   446                 case opc_fcmpl:

   447                 case opc_fcmpg:

   448                 case opc_dcmpl:

   449                 case opc_dcmpg: {

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

   451                     break;

   452                 }

   453                 case opc_if_acmpeq:

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

   455                     break;

   456                 case opc_if_acmpne:

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

   458                     break;

   459                 case opc_if_icmpeq: {

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

   461                     break;

   462                 }

   463                 case opc_ifeq: {

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

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

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

   467                     i += 2;

   468                     break;

   469                 }

   470                 case opc_ifne: {

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

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

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

   474                     i += 2;

   475                     break;

   476                 }

   477                 case opc_iflt: {

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

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

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

   481                     i += 2;

   482                     break;

   483                 }

   484                 case opc_ifle: {

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

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

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

   488                     i += 2;

   489                     break;

   490                 }

   491                 case opc_ifgt: {

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

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

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

   495                     i += 2;

   496                     break;

   497                 }

   498                 case opc_ifge: {

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

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

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

   502                     i += 2;

   503                     break;

   504                 }

   505                 case opc_ifnonnull: {

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

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

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

   509                     i += 2;

   510                     break;

   511                 }

   512                 case opc_ifnull: {

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

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

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

   516                     i += 2;

   517                     break;

   518                 }

   519                 case opc_if_icmpne:

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

   521                     break;

   522                 case opc_if_icmplt:

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

   524                     break;

   525                 case opc_if_icmple:

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

   527                     break;

   528                 case opc_if_icmpgt:

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

   530                     break;

   531                 case opc_if_icmpge:

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

   533                     break;

   534                 case opc_goto: {

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

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

   537                     i += 2;

   538                     break;

   539                 }

   540                 case opc_lookupswitch: {

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

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

   543                     table += 4;

   544                     int n = readInt4(byteCodes, table);

   545                     table += 4;

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

   547                     while (n-- > 0) {

   548                         int cnstnt = readInt4(byteCodes, table);

   549                         table += 4;

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

   551                         table += 4;

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

   553                     }

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

   555                     i = table - 1;

   556                     break;

   557                 }

   558                 case opc_tableswitch: {

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

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

   561                     table += 4;

   562                     int low = readInt4(byteCodes, table);

   563                     table += 4;

   564                     int high = readInt4(byteCodes, table);

   565                     table += 4;

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

   567                     while (low <= high) {

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

   569                         table += 4;

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

   571                         low++;

   572                     }

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

   574                     i = table - 1;

   575                     break;

   576                 }

   577                 case opc_invokeinterface: {

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

   579                     break;

   580                 }

   581                 case opc_invokevirtual:

   582                     i = invokeVirtualMethod(byteCodes, i);

   583                     break;

   584                 case opc_invokespecial:

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

   586                     break;

   587                 case opc_invokestatic:

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

   589                     break;

   590                 case opc_new: {

   591                     int indx = readIntArg(byteCodes, i);

   592                     String ci = jc.getClassName(indx);

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

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

   595                     out.append(");");

   596                     addReference(ci);

   597                     i += 2;

   598                     break;

   599                 }

   600                 case opc_newarray: {

   601                     int type = byteCodes[i++];

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

   603                     break;

   604                 }

   605                 case opc_anewarray: {

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

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

   608                     break;

   609                 }

   610                 case opc_multianewarray: {

   611                     i += 2;

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

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

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

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

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

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

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

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

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

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

   622                             append(";");

   623                     }

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

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

   626                     }

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

   628                     break;

   629                 }

   630                 case opc_arraylength:

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

   632                     break;

   633                 case opc_iastore:

   634                 case opc_lastore:

   635                 case opc_fastore:

   636                 case opc_dastore:

   637                 case opc_aastore:

   638                 case opc_bastore:

   639                 case opc_castore:

   640                 case opc_sastore: {

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

   642                     break;

   643                 }

   644                 case opc_iaload:

   645                 case opc_laload:

   646                 case opc_faload:

   647                 case opc_daload:

   648                 case opc_aaload:

   649                 case opc_baload:

   650                 case opc_caload:

   651                 case opc_saload: {

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

   653                     break;

   654                 }

   655                 case opc_pop2:

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

   657                 case opc_pop:

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

   659                     break;

   660                 case opc_dup:

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

   662                     break;

   663                 case opc_bipush:

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

   665                     break;

   666                 case opc_sipush:

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

   668                     i += 2;

   669                     break;

   670                 case opc_getfield: {

   671                     int indx = readIntArg(byteCodes, i);

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

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

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

   675                     i += 2;

   676                     break;

   677                 }

   678                 case opc_getstatic: {

   679                     int indx = readIntArg(byteCodes, i);

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

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

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

   683                     i += 2;

   684                     addReference(fi[0]);

   685                     break;

   686                 }

   687                 case opc_putstatic: {

   688                     int indx = readIntArg(byteCodes, i);

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

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

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

   692                     i += 2;

   693                     addReference(fi[0]);

   694                     break;

   695                 }

   696                 case opc_putfield: {

   697                     int indx = readIntArg(byteCodes, i);

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

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

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

   701                     i += 2;

   702                     break;

   703                 }

   704                 case opc_checkcast: {

   705                     int indx = readIntArg(byteCodes, i);

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

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

   708                         // no way to check arrays right now

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

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

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

   712                     }

   713                     i += 2;

   714                     break;

   715                 }

   716                 case opc_instanceof: {

   717                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   722                     i += 2;

   723                     break;

   724                 }

   725                 case opc_athrow: {

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

   727                     break;

   728                 }

   729                 default: {

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

   731                 }

   733             }

   734             out.append(" //");

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

   736                 out.append(" ");

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

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

   739             }

   740             out.append("\n");

   741         }

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

   743     }

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

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

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

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

   749         return i + 2;

   750     }

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

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

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

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

   756     }

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

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

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

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

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

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

   763     }

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

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

   766     }

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

   769         int i = 0;

   770         Boolean count = null;

   771         boolean array = false;

   772         int firstPos = sig.length();

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

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

   775             switch (ch) {

   776                 case '(':

   777                     count = true;

   778                     continue;

   779                 case ')':

   780                     count = false;

   781                     continue;

   782                 case 'A':

   783                     array = true;

   784                     break;

   785                 case 'B':

   786                 case 'C':

   787                 case 'D':

   788                 case 'F':

   789                 case 'I':

   790                 case 'J':

   791                 case 'S':

   792                 case 'Z':

   793                     if (count) {

   794                         if (array) {

   795                             sig.append('A');

   796                         }

   797                         sig.append(ch);

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

   799                             cnt.append('1');

   800                         } else {

   801                             cnt.append('0');

   802                         }

   803                     } else {

   804                         hasReturnType[0] = true;

   805                         sig.insert(firstPos, ch);

   806                         if (array) {

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

   808                         }

   809                     }

   810                     array = false;

   811                     continue;

   812                 case 'V':

   813                     assert !count;

   814                     hasReturnType[0] = false;

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

   816                     continue;

   817                 case 'L':

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

   819                     if (count) {

   820                         if (array) {

   821                             sig.append('A');

   822                         }

   823                         sig.append(ch);

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

   825                         cnt.append('0');

   826                     } else {

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

   828                         sig.insert(firstPos, ch);

   829                         if (array) {

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

   831                         }

   832                         hasReturnType[0] = true;

   833                     }

   834                     i = next + 1;

   835                     continue;

   836                 case '[':

   837                     //arrays++;

   838                     continue;

   839                 default:

   840                     break; // invalid character

   841             }

   842         }

   843     }

   845     private void generateStaticField(FieldData v) throws IOException {

   846         out.append("\nvar ")

   847            .append(className(jc))

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

   849     }

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

   852         StringBuilder name = new StringBuilder();

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

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

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

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

   857         } else {

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

   859         }

   861         boolean hasReturn[] = { false };

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

   863         return name.toString();

   864     }

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

   867         StringBuilder name = new StringBuilder();

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

   869         String nm= mi[1];

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

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

   872         } else {

   873             name.append(nm);

   874         }

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

   876         return name.toString();

   877     }

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

   880     throws IOException {

   881         int methodIndex = readIntArg(byteCodes, i);

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

   883         boolean[] hasReturn = { false };

   884         StringBuilder cnt = new StringBuilder();

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

   886         out.append("{ ");

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

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

   889         }

   891         if (hasReturn[0]) {

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

   893         }

   894         final String in = mi[0];

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

   896         if (isStatic) {

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

   898         } else {

   899             out.append('_');

   900         }

   901         out.append(mn);

   902         out.append('(');

   903         String sep = "";

   904         if (!isStatic) {

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

   906             sep = ", ";

   907         }

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

   909             out.append(sep);

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

   911             sep = ", ";

   912         }

   913         out.append(")");

   914         if (hasReturn[0]) {

   915             out.append(")");

   916         }

   917         out.append("; }");

   918         i += 2;

   919         addReference(in);

   920         return i;

   921     }

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

   923     throws IOException {

   924         int methodIndex = readIntArg(byteCodes, i);

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

   926         boolean[] hasReturn = { false };

   927         StringBuilder cnt = new StringBuilder();

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

   929         out.append("{ ");

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

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

   932         }

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

   934         if (hasReturn[0]) {

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

   936         }

   937         out.append("self.");

   938         out.append(mn);

   939         out.append('(');

   940         out.append("self");

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

   942             out.append(", ");

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

   944         }

   945         out.append(")");

   946         if (hasReturn[0]) {

   947             out.append(")");

   948         }

   949         out.append("; }");

   950         i += 2;

   951         return i;

   952     }

   954     private void addReference(String cn) throws IOException {

   955         if (references != null) {

   956             if (references.add(cn)) {

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

   958             }

   959         }

   960     }

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

   963         int arr = 0;

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

   965             out.append('A');

   966             d = d.substring(1);

   967         }

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

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

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

   971         } else {

   972             out.append(d);

   973         }

   974     }

   976     private String encodeConstant(int entryIndex) {

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

   978         return s;

   979     }

   981     private String findDescriptor(String d) {

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

   983     }

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

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

   987         if (arr == null) {

   988             return false;

   989         }

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

   991         class P extends AnnotationParser {

   992             int cnt;

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

   994             String body;

   996             @Override

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

   998                 if (type.equals(jvmType)) {

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

  1000                         body = value;

  1001                     } else if ("args".equals(attr)) {

  1002                         args[cnt++] = value;

  1003                     } else {

  1004                         throw new IllegalArgumentException(attr);

  1005                     }

  1006                 }

  1007             }

  1008         }

  1009         P p = new P();

  1010         p.parse(arr, jc);

  1011         if (p.body == null) {

  1012             return false;

  1013         }

  1014         StringBuilder cnt = new StringBuilder();

  1015         out.append("\nfunction ").append(className(jc)).append('_').

  1016             append(findMethodName(m, cnt));

  1017         out.append("(");

  1018         String space;

  1019         int index;

  1020         if (!isStatic) {

  1021             out.append(p.args[0]);

  1022             space = ",";

  1023             index = 1;

  1024         } else {

  1025             space = "";

  1026             index = 0;

  1027         }

  1028         for (int i = 0; i < cnt.length(); i++) {

  1029             out.append(space);

  1030             out.append(p.args[index]);

  1031             index++;

  1032             space = ",";

  1033         }

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

  1035         out.append(p.body);

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

  1037         return true;

  1038     }

  1039     private static String className(ClassData jc) {

  1040         //return jc.getName().getInternalName().replace('/', '_');

  1041         return jc.getClassName().replace('/', '_');

  1042     }

  1044     private static String[] findAnnotation(

  1045         byte[] arr, ClassData cd, final String className,

  1046         final String... attrNames

  1047     ) throws IOException {

  1048         if (arr == null) {

  1049             return null;

  1050         }

  1051         final String[] values = new String[attrNames.length];

  1052         final boolean[] found = { false };

  1053         final String jvmType = "L" + className.replace('.', '/') + ";";

  1054         AnnotationParser ap = new AnnotationParser() {

  1055             @Override

  1056             protected void visitAttr(String type, String attr, String value) {

  1057                 if (type.equals(jvmType)) {

  1058                     found[0] = true;

  1059                     for (int i = 0; i < attrNames.length; i++) {

  1060                         if (attrNames[i].equals(attr)) {

  1061                             values[i] = value;

  1062                         }

  1063                     }

  1064                 }

  1065             }

  1067         };

  1068         ap.parse(arr, cd);

  1069         return found[0] ? values : null;

  1070     }

  1071 }

author	Jaroslav Tulach <jtulach@netbeans.org>
	Mon, 12 Nov 2012 21:05:23 +0100
branch	javap
changeset 156	3bb1a148a795
parent 152	2cda429aeb49
child 162	70e7710a65dc
permissions	-rw-r--r--