hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@7efb52f76270

     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 (Method m : jc.getMethods()) {

    94             if (!m.isStatic()) {

    95                 compiler.generateMethodReference(m);

    96             }

    97         }

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

    99             if (!v.isStatic()) {

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

   101             }

   102         }

   103         out.append("\n  this.$instOf_").append(className).append(" = true;");

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

   105             out.append("\n  this.$instOf_").append(superInterface.getInternalName().replace('/', '_')).append(" = true;");

   106         }

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

   108         ClassName sc = jc.getSuperClass();

   109         if (sc != null) {

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

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

   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 = 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(Method m) throws IOException {

   156         final String name = findMethodName(m);

   157         out.append("\n  this.").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 = 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_astore_0:

   242                 case bc_istore_0:

   243                 case bc_lstore_0:

   244                 case bc_fstore_0:

   245                 case bc_dstore_0:

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

   247                     break;

   248                 case bc_astore_1:

   249                 case bc_istore_1:

   250                 case bc_lstore_1:

   251                 case bc_fstore_1:

   252                 case bc_dstore_1:

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

   254                     break;

   255                 case bc_astore_2:

   256                 case bc_istore_2:

   257                 case bc_lstore_2:

   258                 case bc_fstore_2:

   259                 case bc_dstore_2:

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

   261                     break;

   262                 case bc_astore_3:

   263                 case bc_istore_3:

   264                 case bc_lstore_3:

   265                 case bc_fstore_3:

   266                 case bc_dstore_3:

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

   268                     break;

   269                 case bc_iadd:

   270                 case bc_ladd:

   271                 case bc_fadd:

   272                 case bc_dadd:

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

   274                     break;

   275                 case bc_isub:

   276                 case bc_lsub:

   277                 case bc_fsub:

   278                 case bc_dsub:

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

   280                     break;

   281                 case bc_imul:

   282                 case bc_lmul:

   283                 case bc_fmul:

   284                 case bc_dmul:

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

   286                     break;

   287                 case bc_idiv:

   288                 case bc_ldiv:

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

   290                     break;

   291                 case bc_fdiv:

   292                 case bc_ddiv:

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

   294                     break;

   295                 case bc_iand:

   296                 case bc_land:

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

   298                     break;

   299                 case bc_ior:

   300                 case bc_lor:

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

   302                     break;

   303                 case bc_ixor:

   304                 case bc_lxor:

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

   306                     break;

   307                 case bc_iinc: {

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

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

   310                     if (incrBy == 1) {

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

   312                     } else {

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

   314                     }

   315                     break;

   316                 }

   317                 case bc_return:

   318                     out.append("return;");

   319                     break;

   320                 case bc_ireturn:

   321                 case bc_lreturn:

   322                 case bc_freturn:

   323                 case bc_dreturn:

   324                 case bc_areturn:

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

   326                     break;

   327                 case bc_i2l:

   328                 case bc_i2f:

   329                 case bc_i2d:

   330                 case bc_l2i:

   331                     // max int check?

   332                 case bc_l2f:

   333                 case bc_l2d:

   334                 case bc_f2d:

   335                 case bc_d2f:

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

   337                     break;

   338                 case bc_f2i:

   339                 case bc_f2l:

   340                 case bc_d2i:

   341                 case bc_d2l:

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

   343                     break;

   344                 case bc_i2b:

   345                 case bc_i2c:

   346                 case bc_i2s:

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

   348                     break;

   349                 case bc_iconst_0:

   350                 case bc_dconst_0:

   351                 case bc_lconst_0:

   352                 case bc_fconst_0:

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

   354                     break;

   355                 case bc_iconst_1:

   356                 case bc_lconst_1:

   357                 case bc_fconst_1:

   358                 case bc_dconst_1:

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

   360                     break;

   361                 case bc_iconst_2:

   362                 case bc_fconst_2:

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

   364                     break;

   365                 case bc_iconst_3:

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

   367                     break;

   368                 case bc_iconst_4:

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

   370                     break;

   371                 case bc_iconst_5:

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

   373                     break;

   374                 case bc_ldc: {

   375                     int indx = byteCodes[++i];

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

   377                     String v = encodeConstant(entry);

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

   379                     break;

   380                 }

   381                 case bc_ldc_w:

   382                 case bc_ldc2_w: {

   383                     int indx = readIntArg(byteCodes, i);

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

   385                     i += 2;

   386                     String v = encodeConstant(entry);

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

   388                     break;

   389                 }

   390                 case bc_lcmp:

   391                 case bc_fcmpl:

   392                 case bc_fcmpg:

   393                 case bc_dcmpl:

   394                 case bc_dcmpg: {

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

   396                     break;

   397                 }

   398                 case bc_if_icmpeq: {

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

   400                     break;

   401                 }

   402                 case bc_ifeq: {

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

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

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

   406                     i += 2;

   407                     break;

   408                 }

   409                 case bc_ifne: {

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

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

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

   413                     i += 2;

   414                     break;

   415                 }

   416                 case bc_iflt: {

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

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

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

   420                     i += 2;

   421                     break;

   422                 }

   423                 case bc_ifle: {

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

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

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

   427                     i += 2;

   428                     break;

   429                 }

   430                 case bc_ifgt: {

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

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

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

   434                     i += 2;

   435                     break;

   436                 }

   437                 case bc_ifge: {

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

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

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

   441                     i += 2;

   442                     break;

   443                 }

   444                 case bc_ifnonnull: {

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

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

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

   448                     i += 2;

   449                     break;

   450                 }

   451                 case bc_ifnull: {

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

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

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

   455                     i += 2;

   456                     break;

   457                 }

   458                 case bc_if_icmpne:

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

   460                     break;

   461                 case bc_if_icmplt:

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

   463                     break;

   464                 case bc_if_icmple:

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

   466                     break;

   467                 case bc_if_icmpgt:

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

   469                     break;

   470                 case bc_if_icmpge:

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

   472                     break;

   473                 case bc_goto: {

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

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

   476                     i += 2;

   477                     break;

   478                 }

   479                 case bc_invokeinterface:

   480                 case bc_invokevirtual:

   481                     i = invokeVirtualMethod(byteCodes, i);

   482                     break;

   483                 case bc_invokespecial:

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

   485                     break;

   486                 case bc_invokestatic:

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

   488                     break;

   489                 case bc_new: {

   490                     int indx = readIntArg(byteCodes, i);

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

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

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

   494                     out.append(");");

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

   496                     i += 2;

   497                     break;

   498                 }

   499                 case bc_newarray: {

   500                     int type = byteCodes[i++];

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

   502                     break;

   503                 }

   504                 case bc_anewarray: {

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

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

   507                     break;

   508                 }

   509                 case bc_arraylength:

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

   511                     break;

   512                 case bc_iastore:

   513                 case bc_lastore:

   514                 case bc_fastore:

   515                 case bc_dastore:

   516                 case bc_aastore:

   517                 case bc_bastore:

   518                 case bc_castore:

   519                 case bc_sastore: {

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

   521                     break;

   522                 }

   523                 case bc_iaload:

   524                 case bc_laload:

   525                 case bc_faload:

   526                 case bc_daload:

   527                 case bc_aaload:

   528                 case bc_baload:

   529                 case bc_caload:

   530                 case bc_saload: {

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

   532                     break;

   533                 }

   534                 case bc_dup:

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

   536                     break;

   537                 case bc_bipush:

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

   539                     break;

   540                 case bc_getfield: {

   541                     int indx = readIntArg(byteCodes, i);

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

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

   544                     i += 2;

   545                     break;

   546                 }

   547                 case bc_getstatic: {

   548                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   553                     i += 2;

   554                     addReference(in);

   555                     break;

   556                 }

   557                 case bc_putstatic: {

   558                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   563                     i += 2;

   564                     addReference(in);

   565                     break;

   566                 }

   567                 case bc_putfield: {

   568                     int indx = readIntArg(byteCodes, i);

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

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

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

   572                     i += 2;

   573                     break;

   574                 }

   575                 case bc_checkcast: {

   576                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   581                     i += 2;

   582                     break;

   583                 }

   584                 case bc_instanceof: {

   585                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   590                     i += 2;

   591                     break;

   592                 }

   594             }

   595             out.append(" /*");

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

   597                 out.append(" ");

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

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

   600             }

   601             out.append("*/\n");

   602         }

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

   604     }

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

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

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

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

   610         return i + 2;

   611     }

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

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

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

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

   617     }

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

   620         int cnt = 0;

   621         int i = 0;

   622         Boolean count = null;

   623         int firstPos = sig.length();

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

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

   626             switch (ch) {

   627                 case '(':

   628                     count = true;

   629                     continue;

   630                 case ')':

   631                     count = false;

   632                     continue;

   633                 case 'B':

   634                 case 'C':

   635                 case 'D':

   636                 case 'F':

   637                 case 'I':

   638                 case 'J':

   639                 case 'S':

   640                 case 'Z':

   641                     if (count) {

   642                         cnt++;

   643                         sig.append(ch);

   644                     } else {

   645                         hasReturnType[0] = true;

   646                         sig.insert(firstPos, ch);

   647                     }

   648                     continue;

   649                 case 'V':

   650                     assert !count;

   651                     hasReturnType[0] = false;

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

   653                     continue;

   654                 case 'L':

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

   656                     if (count) {

   657                         cnt++;

   658                         sig.append(ch);

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

   660                     } else {

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

   662                         sig.insert(firstPos, ch);

   663                         hasReturnType[0] = true;

   664                     }

   665                     i = next + 1;

   666                     continue;

   667                 case '[':

   668                     //arrays++;

   669                     continue;

   670                 default:

   671                     break; // invalid character

   672             }

   673         }

   674         return cnt;

   675     }

   677     private void generateStaticField(Variable v) throws IOException {

   678         out.append("\nvar ")

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

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

   681     }

   683     private String findMethodName(Method m) {

   684         StringBuilder tmp = new StringBuilder();

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

   686             tmp.append("consV"); // NOI18N

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

   688             tmp.append("classV"); // NOI18N

   689         } else {

   690             tmp.append(m.getName());

   691             outType(m.getReturnType(), tmp);

   692         }

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

   694         for (Parameter t : args) {

   695             outType(t.getDescriptor(), tmp);

   696         }

   697         return tmp.toString();

   698     }

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

   701         StringBuilder name = new StringBuilder();

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

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

   704         } else {

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

   706         }

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

   708         return name.toString();

   709     }

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

   712     throws IOException {

   713         int methodIndex = readIntArg(byteCodes, i);

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

   715         boolean[] hasReturn = { false };

   716         int[] cnt = { 0 };

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

   718         out.append("{ ");

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

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

   721         }

   723         if (hasReturn[0]) {

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

   725         }

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

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

   728         out.append('_');

   729         out.append(mn);

   730         out.append('(');

   731         String sep = "";

   732         if (!isStatic) {

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

   734             sep = ", ";

   735         }

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

   737             out.append(sep);

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

   739             sep = ", ";

   740         }

   741         out.append(")");

   742         if (hasReturn[0]) {

   743             out.append(")");

   744         }

   745         out.append("; }");

   746         i += 2;

   747         addReference(in);

   748         return i;

   749     }

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

   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         }

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

   762         if (hasReturn[0]) {

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

   764         }

   765         out.append("self.");

   766         out.append(mn);

   767         out.append('(');

   768         out.append("self");

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

   770             out.append(", ");

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

   772         }

   773         out.append(")");

   774         if (hasReturn[0]) {

   775             out.append(")");

   776         }

   777         out.append("; }");

   778         i += 2;

   779         return i;

   780     }

   782     private void addReference(String cn) {

   783         if (references != null) {

   784             references.add(cn);

   785         }

   786     }

   788     private void outType(final String d, StringBuilder out) {

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

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

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

   792         } else {

   793             out.append(d);

   794         }

   795     }

   797     private String encodeConstant(CPEntry entry) {

   798         final String v;

   799         if (entry instanceof CPStringInfo) {

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

   801         } else {

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

   803         }

   804         return v;

   805     }

   806 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Tue, 25 Sep 2012 12:26:29 +0200
changeset 30	7efb52f76270
parent 22	b9318fe303cd
child 31	3072c9fab69c
permissions	-rw-r--r--