hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@b07c7c256771

     1 /*

     2 Java 4 Browser Bytecode Translator

     3 Copyright (C) 2012-2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

     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.

     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.

    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 static org.netbeans.modules.classfile.ByteCodes.*;

    26 import org.netbeans.modules.classfile.CPClassInfo;

    27 import org.netbeans.modules.classfile.CPEntry;

    28 import org.netbeans.modules.classfile.CPFieldInfo;

    29 import org.netbeans.modules.classfile.CPMethodInfo;

    30 import org.netbeans.modules.classfile.CPStringInfo;

    31 import org.netbeans.modules.classfile.ClassFile;

    32 import org.netbeans.modules.classfile.ClassName;

    33 import org.netbeans.modules.classfile.Code;

    34 import org.netbeans.modules.classfile.Method;

    35 import org.netbeans.modules.classfile.Parameter;

    36 import org.netbeans.modules.classfile.Variable;

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

    39  *

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

    41  */

    42 public final class ByteCodeToJavaScript {

    43     private final ClassFile jc;

    44     private final Appendable out;

    45     private final Collection<? super String> references;

    47     private ByteCodeToJavaScript(

    48         ClassFile jc, Appendable out, Collection<? super String> references

    49     ) {

    50         this.jc = jc;

    51         this.out = out;

    52         this.references = references;

    53     }

    55     /**

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

    57      *

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

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

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

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

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

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

    64      *   if one is not interested in knowing references

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

    66      */

    68     public static void compile(

    69         InputStream classFile, Appendable out,

    70         Collection<? super String> references

    71     ) throws IOException {

    72         ClassFile jc = new ClassFile(classFile, true);

    73         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

    74             jc, out, references

    75         );

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

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

    78             if (m.isStatic()) {

    79                 compiler.generateStaticMethod(m, toInitilize);

    80             } else {

    81                 compiler.generateInstanceMethod(m);

    82             }

    83         }

    84         for (Variable v : jc.getVariables()) {

    85             if (v.isStatic()) {

    86                 compiler.generateStaticField(v);

    87             }

    88         }

    90         final String className = jc.getName().getInternalName().replace('/', '_');

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

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

    93         for (Variable v : jc.getVariables()) {

    94             if (!v.isStatic()) {

    95                 out.append("\n  this." + v.getName() + " = 0;");

    96             }

    97         }

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

    99         ClassName sc = jc.getSuperClass();

   100         if (sc != null) {

   101             out.append("\n").append(className)

   102                .append(".prototype = new ").append(sc.getInternalName().replace('/', '_')).append(';');

   103         }

   104         for (Method m : jc.getMethods()) {

   105             if (!m.isStatic() && !m.isPrivate() && !m.getName().contains("<init>")) {

   106                 compiler.generateMethodReference("\n" + className + ".prototype.", m);

   107             }

   108         }

   109         out.append("\n" + className + ".prototype.$instOf_").append(className).append(" = true;");

   110         for (ClassName superInterface : jc.getInterfaces()) {

   111             out.append("\n" + className + ".prototype.$instOf_").append(superInterface.getInternalName().replace('/', '_')).append(" = true;");

   112         }

   113         for (String init : toInitilize) {

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

   115         }

   116     }

   117     private void generateStaticMethod(Method m, List<String> toInitilize) throws IOException {

   118         final String mn = findMethodName(m);

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

   120             jc.getName().getInternalName().replace('/', '_')

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

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

   123             toInitilize.add(jc.getName().getInternalName().replace('/', '_') + '_' + mn);

   124         }

   125         out.append('(');

   126         String space = "";

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

   128         for (int index = 0, i = 0; i < args.size(); i++) {

   129             out.append(space);

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

   131             space = ",";

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

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

   134                 index += 2;

   135             } else {

   136                 index++;

   137             }

   138         }

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

   140         final Code code = m.getCode();

   141         if (code != null) {

   142             int len = code.getMaxLocals();

   143             for (int index = args.size(), i = args.size(); i < len; i++) {

   144                 out.append("  var ");

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

   146             }

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

   148             produceCode(code.getByteCodes());

   149         } else {

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

   151         }

   152         out.append("}");

   153     }

   155     private void generateMethodReference(String prefix, Method m) throws IOException {

   156         final String name = findMethodName(m);

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

   158            .append(jc.getName().getInternalName().replace('/', '_'))

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

   160     }

   162     private void generateInstanceMethod(Method m) throws IOException {

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

   164             jc.getName().getInternalName().replace('/', '_')

   165         ).append('_').append(findMethodName(m));

   166         out.append("(arg0");

   167         String space = ",";

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

   169         for (int index = 1, i = 0; i < args.size(); i++) {

   170             out.append(space);

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

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

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

   174                 index += 2;

   175             } else {

   176                 index++;

   177             }

   178         }

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

   180         final Code code = m.getCode();

   181         if (code != null) {

   182             int len = code.getMaxLocals();

   183             for (int index = args.size(), i = args.size(); i < len; i++) {

   184                 out.append("  var ");

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

   186             }

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

   188             out.append(Integer.toString(code.getMaxStack()));

   189             out.append(");\n");

   190             produceCode(code.getByteCodes());

   191         } else {

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

   193         }

   194         out.append("}");

   195     }

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

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

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

   200             int prev = i;

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

   202             final int c = (byteCodes[i] + 256) % 256;

   203             switch (c) {

   204                 case bc_aload_0:

   205                 case bc_iload_0:

   206                 case bc_lload_0:

   207                 case bc_fload_0:

   208                 case bc_dload_0:

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

   210                     break;

   211                 case bc_aload_1:

   212                 case bc_iload_1:

   213                 case bc_lload_1:

   214                 case bc_fload_1:

   215                 case bc_dload_1:

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

   217                     break;

   218                 case bc_aload_2:

   219                 case bc_iload_2:

   220                 case bc_lload_2:

   221                 case bc_fload_2:

   222                 case bc_dload_2:

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

   224                     break;

   225                 case bc_aload_3:

   226                 case bc_iload_3:

   227                 case bc_lload_3:

   228                 case bc_fload_3:

   229                 case bc_dload_3:

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

   231                     break;

   232                 case bc_iload:

   233                 case bc_lload:

   234                 case bc_fload:

   235                 case bc_dload:

   236                 case bc_aload: {

   237                     final int indx = (byteCodes[++i] + 256) % 256;

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

   239                     break;

   240                 }

   241                 case bc_istore:

   242                 case bc_lstore:

   243                 case bc_fstore:

   244                 case bc_dstore:

   245                 case bc_astore: {

   246                     final int indx = (byteCodes[++i] + 256) % 256;

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

   248                     break;

   249                 }

   250                 case bc_astore_0:

   251                 case bc_istore_0:

   252                 case bc_lstore_0:

   253                 case bc_fstore_0:

   254                 case bc_dstore_0:

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

   256                     break;

   257                 case bc_astore_1:

   258                 case bc_istore_1:

   259                 case bc_lstore_1:

   260                 case bc_fstore_1:

   261                 case bc_dstore_1:

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

   263                     break;

   264                 case bc_astore_2:

   265                 case bc_istore_2:

   266                 case bc_lstore_2:

   267                 case bc_fstore_2:

   268                 case bc_dstore_2:

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

   270                     break;

   271                 case bc_astore_3:

   272                 case bc_istore_3:

   273                 case bc_lstore_3:

   274                 case bc_fstore_3:

   275                 case bc_dstore_3:

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

   277                     break;

   278                 case bc_iadd:

   279                 case bc_ladd:

   280                 case bc_fadd:

   281                 case bc_dadd:

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

   283                     break;

   284                 case bc_isub:

   285                 case bc_lsub:

   286                 case bc_fsub:

   287                 case bc_dsub:

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

   289                     break;

   290                 case bc_imul:

   291                 case bc_lmul:

   292                 case bc_fmul:

   293                 case bc_dmul:

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

   295                     break;

   296                 case bc_idiv:

   297                 case bc_ldiv:

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

   299                     break;

   300                 case bc_fdiv:

   301                 case bc_ddiv:

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

   303                     break;

   304                 case bc_iand:

   305                 case bc_land:

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

   307                     break;

   308                 case bc_ior:

   309                 case bc_lor:

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

   311                     break;

   312                 case bc_ixor:

   313                 case bc_lxor:

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

   315                     break;

   316                 case bc_iinc: {

   317                     final int varIndx = (byteCodes[++i] + 256) % 256;

   318                     final int incrBy = (byteCodes[++i] + 256) % 256;

   319                     if (incrBy == 1) {

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

   321                     } else {

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

   323                     }

   324                     break;

   325                 }

   326                 case bc_return:

   327                     out.append("return;");

   328                     break;

   329                 case bc_ireturn:

   330                 case bc_lreturn:

   331                 case bc_freturn:

   332                 case bc_dreturn:

   333                 case bc_areturn:

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

   335                     break;

   336                 case bc_i2l:

   337                 case bc_i2f:

   338                 case bc_i2d:

   339                 case bc_l2i:

   340                     // max int check?

   341                 case bc_l2f:

   342                 case bc_l2d:

   343                 case bc_f2d:

   344                 case bc_d2f:

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

   346                     break;

   347                 case bc_f2i:

   348                 case bc_f2l:

   349                 case bc_d2i:

   350                 case bc_d2l:

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

   352                     break;

   353                 case bc_i2b:

   354                 case bc_i2c:

   355                 case bc_i2s:

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

   357                     break;

   358                 case bc_aconst_null:

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

   360                     break;

   361                 case bc_iconst_0:

   362                 case bc_dconst_0:

   363                 case bc_lconst_0:

   364                 case bc_fconst_0:

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

   366                     break;

   367                 case bc_iconst_1:

   368                 case bc_lconst_1:

   369                 case bc_fconst_1:

   370                 case bc_dconst_1:

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

   372                     break;

   373                 case bc_iconst_2:

   374                 case bc_fconst_2:

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

   376                     break;

   377                 case bc_iconst_3:

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

   379                     break;

   380                 case bc_iconst_4:

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

   382                     break;

   383                 case bc_iconst_5:

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

   385                     break;

   386                 case bc_ldc: {

   387                     int indx = byteCodes[++i];

   388                     CPEntry entry = jc.getConstantPool().get(indx);

   389                     String v = encodeConstant(entry);

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

   391                     break;

   392                 }

   393                 case bc_ldc_w:

   394                 case bc_ldc2_w: {

   395                     int indx = readIntArg(byteCodes, i);

   396                     CPEntry entry = jc.getConstantPool().get(indx);

   397                     i += 2;

   398                     String v = encodeConstant(entry);

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

   400                     break;

   401                 }

   402                 case bc_lcmp:

   403                 case bc_fcmpl:

   404                 case bc_fcmpg:

   405                 case bc_dcmpl:

   406                 case bc_dcmpg: {

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

   408                     break;

   409                 }

   410                 case bc_if_icmpeq: {

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

   412                     break;

   413                 }

   414                 case bc_ifeq: {

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

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

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

   418                     i += 2;

   419                     break;

   420                 }

   421                 case bc_ifne: {

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

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

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

   425                     i += 2;

   426                     break;

   427                 }

   428                 case bc_iflt: {

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

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

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

   432                     i += 2;

   433                     break;

   434                 }

   435                 case bc_ifle: {

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

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

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

   439                     i += 2;

   440                     break;

   441                 }

   442                 case bc_ifgt: {

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

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

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

   446                     i += 2;

   447                     break;

   448                 }

   449                 case bc_ifge: {

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

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

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

   453                     i += 2;

   454                     break;

   455                 }

   456                 case bc_ifnonnull: {

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

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

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

   460                     i += 2;

   461                     break;

   462                 }

   463                 case bc_ifnull: {

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

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

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

   467                     i += 2;

   468                     break;

   469                 }

   470                 case bc_if_icmpne:

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

   472                     break;

   473                 case bc_if_icmplt:

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

   475                     break;

   476                 case bc_if_icmple:

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

   478                     break;

   479                 case bc_if_icmpgt:

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

   481                     break;

   482                 case bc_if_icmpge:

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

   484                     break;

   485                 case bc_goto: {

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

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

   488                     i += 2;

   489                     break;

   490                 }

   491                 case bc_invokeinterface: {

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

   493                     break;

   494                 }

   495                 case bc_invokevirtual:

   496                     i = invokeVirtualMethod(byteCodes, i);

   497                     break;

   498                 case bc_invokespecial:

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

   500                     break;

   501                 case bc_invokestatic:

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

   503                     break;

   504                 case bc_new: {

   505                     int indx = readIntArg(byteCodes, i);

   506                     CPClassInfo ci = jc.getConstantPool().getClass(indx);

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

   508                     out.append("new ").append(ci.getClassName().getInternalName().replace('/','_'));

   509                     out.append(");");

   510                     addReference(ci.getClassName().getInternalName());

   511                     i += 2;

   512                     break;

   513                 }

   514                 case bc_newarray: {

   515                     int type = byteCodes[i++];

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

   517                     break;

   518                 }

   519                 case bc_anewarray: {

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

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

   522                     break;

   523                 }

   524                 case bc_arraylength:

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

   526                     break;

   527                 case bc_iastore:

   528                 case bc_lastore:

   529                 case bc_fastore:

   530                 case bc_dastore:

   531                 case bc_aastore:

   532                 case bc_bastore:

   533                 case bc_castore:

   534                 case bc_sastore: {

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

   536                     break;

   537                 }

   538                 case bc_iaload:

   539                 case bc_laload:

   540                 case bc_faload:

   541                 case bc_daload:

   542                 case bc_aaload:

   543                 case bc_baload:

   544                 case bc_caload:

   545                 case bc_saload: {

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

   547                     break;

   548                 }

   549                 case bc_dup:

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

   551                     break;

   552                 case bc_bipush:

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

   554                     break;

   555                 case bc_sipush:

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

   557                     i += 2;

   558                     break;

   559                 case bc_getfield: {

   560                     int indx = readIntArg(byteCodes, i);

   561                     CPFieldInfo fi = (CPFieldInfo) jc.getConstantPool().get(indx);

   562                     out.append("stack.push(stack.pop().").append(fi.getFieldName()).append(");");

   563                     i += 2;

   564                     break;

   565                 }

   566                 case bc_getstatic: {

   567                     int indx = readIntArg(byteCodes, i);

   568                     CPFieldInfo fi = (CPFieldInfo) jc.getConstantPool().get(indx);

   569                     final String in = fi.getClassName().getInternalName();

   570                     out.append("stack.push(").append(in.replace('/', '_'));

   571                     out.append('_').append(fi.getFieldName()).append(");");

   572                     i += 2;

   573                     addReference(in);

   574                     break;

   575                 }

   576                 case bc_putstatic: {

   577                     int indx = readIntArg(byteCodes, i);

   578                     CPFieldInfo fi = (CPFieldInfo) jc.getConstantPool().get(indx);

   579                     final String in = fi.getClassName().getInternalName();

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

   581                     out.append('_').append(fi.getFieldName()).append(" = stack.pop();");

   582                     i += 2;

   583                     addReference(in);

   584                     break;

   585                 }

   586                 case bc_putfield: {

   587                     int indx = readIntArg(byteCodes, i);

   588                     CPFieldInfo fi = (CPFieldInfo) jc.getConstantPool().get(indx);

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

   590                        .append(fi.getFieldName()).append(" = v; }");

   591                     i += 2;

   592                     break;

   593                 }

   594                 case bc_checkcast: {

   595                     int indx = readIntArg(byteCodes, i);

   596                     CPClassInfo ci = jc.getConstantPool().getClass(indx);

   597                     final String type = ci.getClassName().getType();

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

   599                         // no way to check arrays right now

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

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

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

   603                     }

   604                     i += 2;

   605                     break;

   606                 }

   607                 case bc_instanceof: {

   608                     int indx = readIntArg(byteCodes, i);

   609                     CPClassInfo ci = jc.getConstantPool().getClass(indx);

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

   611                        .append(ci.getClassName().getInternalName().replace('/', '_'))

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

   613                     i += 2;

   614                     break;

   615                 }

   617             }

   618             out.append(" //");

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

   620                 out.append(" ");

   621                 final int cc = (byteCodes[j] + 256) % 256;

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

   623             }

   624             out.append("\n");

   625         }

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

   627     }

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

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

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

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

   633         return i + 2;

   634     }

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

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

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

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

   640     }

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

   643         int cnt = 0;

   644         int i = 0;

   645         Boolean count = null;

   646         boolean array = false;

   647         int firstPos = sig.length();

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

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

   650             switch (ch) {

   651                 case '(':

   652                     count = true;

   653                     continue;

   654                 case ')':

   655                     count = false;

   656                     continue;

   657                 case 'A':

   658                     array = true;

   659                     break;

   660                 case 'B':

   661                 case 'C':

   662                 case 'D':

   663                 case 'F':

   664                 case 'I':

   665                 case 'J':

   666                 case 'S':

   667                 case 'Z':

   668                     if (count) {

   669                         cnt++;

   670                         if (array) {

   671                             sig.append('A');

   672                         }

   673                         sig.append(ch);

   674                     } else {

   675                         hasReturnType[0] = true;

   676                         sig.insert(firstPos, ch);

   677                         if (array) {

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

   679                         }

   680                     }

   681                     continue;

   682                 case 'V':

   683                     assert !count;

   684                     hasReturnType[0] = false;

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

   686                     continue;

   687                 case 'L':

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

   689                     if (count) {

   690                         cnt++;

   691                         if (array) {

   692                             sig.append('A');

   693                         }

   694                         sig.append(ch);

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

   696                     } else {

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

   698                         sig.insert(firstPos, ch);

   699                         if (array) {

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

   701                         }

   702                         hasReturnType[0] = true;

   703                     }

   704                     i = next + 1;

   705                     continue;

   706                 case '[':

   707                     //arrays++;

   708                     continue;

   709                 default:

   710                     break; // invalid character

   711             }

   712         }

   713         return cnt;

   714     }

   716     private void generateStaticField(Variable v) throws IOException {

   717         out.append("\nvar ")

   718            .append(jc.getName().getInternalName().replace('/', '_'))

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

   720     }

   722     private String findMethodName(Method m) {

   723         StringBuilder name = new StringBuilder();

   724         String descr = m.getDescriptor();

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

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

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

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

   729         } else {

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

   731         }

   733         boolean hasReturn[] = { false };

   734         countArgs(findDescriptor(m.getDescriptor()), hasReturn, name);

   735         return name.toString();

   736     }

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

   739         StringBuilder name = new StringBuilder();

   740         String descr = mi.getDescriptor();

   741         if ("<init>".equals(mi.getName())) { // NOI18N

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

   743         } else {

   744             name.append(mi.getName());

   745         }

   746         cnt[0] = countArgs(findDescriptor(mi.getDescriptor()), hasReturn, name);

   747         return name.toString();

   748     }

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

   751     throws IOException {

   752         int methodIndex = readIntArg(byteCodes, i);

   753         CPMethodInfo mi = (CPMethodInfo) jc.getConstantPool().get(methodIndex);

   754         boolean[] hasReturn = { false };

   755         int[] cnt = { 0 };

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

   757         out.append("{ ");

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

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

   760         }

   762         if (hasReturn[0]) {

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

   764         }

   765         final String in = mi.getClassName().getInternalName();

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

   767         out.append('_');

   768         out.append(mn);

   769         out.append('(');

   770         String sep = "";

   771         if (!isStatic) {

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

   773             sep = ", ";

   774         }

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

   776             out.append(sep);

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

   778             sep = ", ";

   779         }

   780         out.append(")");

   781         if (hasReturn[0]) {

   782             out.append(")");

   783         }

   784         out.append("; }");

   785         i += 2;

   786         addReference(in);

   787         return i;

   788     }

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

   790     throws IOException {

   791         int methodIndex = readIntArg(byteCodes, i);

   792         CPMethodInfo mi = (CPMethodInfo) jc.getConstantPool().get(methodIndex);

   793         boolean[] hasReturn = { false };

   794         int[] cnt = { 0 };

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

   796         out.append("{ ");

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

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

   799         }

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

   801         if (hasReturn[0]) {

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

   803         }

   804         out.append("self.");

   805         out.append(mn);

   806         out.append('(');

   807         out.append("self");

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

   809             out.append(", ");

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

   811         }

   812         out.append(")");

   813         if (hasReturn[0]) {

   814             out.append(")");

   815         }

   816         out.append("; }");

   817         i += 2;

   818         return i;

   819     }

   821     private void addReference(String cn) {

   822         if (references != null) {

   823             references.add(cn);

   824         }

   825     }

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

   828         int arr = 0;

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

   830             out.append('A');

   831             d = d.substring(1);

   832         }

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

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

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

   836         } else {

   837             out.append(d);

   838         }

   839     }

   841     private String encodeConstant(CPEntry entry) {

   842         final String v;

   843         if (entry instanceof CPStringInfo) {

   844             v = "\"" + entry.getValue().toString().replace("\"", "\\\"") + "\"";

   845         } else {

   846             v = entry.getValue().toString();

   847         }

   848         return v;

   849     }

   851     private String findDescriptor(String d) {

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

   853     }

   854 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Fri, 28 Sep 2012 14:45:00 +0200
changeset 46	b07c7c256771
parent 42	f30e2afc8ddb
child 48	4fca8ddf46de
child 91	f3b685bd7243
permissions	-rw-r--r--