hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@a236a9f137ac

     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 org.apidesign.bck2brwsr.core.ExtraJavaScript;

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

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

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

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

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

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

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

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

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

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

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

    37 import org.netbeans.modules.classfile.ElementValue;

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

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

    40 import org.netbeans.modules.classfile.PrimitiveElementValue;

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

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

    44  *

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

    46  */

    47 public final class ByteCodeToJavaScript {

    48     private final ClassFile jc;

    49     private final Appendable out;

    50     private final Collection<? super String> references;

    52     private ByteCodeToJavaScript(

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

    54     ) {

    55         this.jc = jc;

    56         this.out = out;

    57         this.references = references;

    58     }

    60     /**

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

    62      *

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

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

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

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

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

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

    69      *   if one is not interested in knowing references

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

    71      *

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

    73      */

    75     public static void compile(

    76         InputStream classFile, Appendable out,

    77         Collection<? super String> references,

    78         Collection<? super String> scripts

    79     ) throws IOException {

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

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

    82         Annotation a = jc.getAnnotation(extraAnn);

    83         if (a != null) {

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

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

    86             scripts.add(res);

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

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

    89                 return;

    90             }

    91         }

    93         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

    94             jc, out, references

    95         );

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

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

    98             if (m.isStatic()) {

    99                 compiler.generateStaticMethod(m, toInitilize);

   100             } else {

   101                 compiler.generateInstanceMethod(m);

   102             }

   103         }

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

   105             if (v.isStatic()) {

   106                 compiler.generateStaticField(v);

   107             }

   108         }

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

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

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

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

   114             if (!v.isStatic()) {

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

   116             }

   117         }

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

   119         ClassName sc = jc.getSuperClass();

   120         if (sc != null) {

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

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

   123         }

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

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

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

   127             }

   128         }

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

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

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

   132         }

   133         for (String init : toInitilize) {

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

   135         }

   136     }

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

   138         final String mn = findMethodName(m);

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

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

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

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

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

   144         }

   145         out.append('(');

   146         String space = "";

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

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

   149             out.append(space);

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

   151             space = ",";

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

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

   154                 index += 2;

   155             } else {

   156                 index++;

   157             }

   158         }

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

   160         final Code code = m.getCode();

   161         if (code != null) {

   162             int len = code.getMaxLocals();

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

   164                 out.append("  var ");

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

   166             }

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

   168             produceCode(code.getByteCodes());

   169         } else {

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

   171         }

   172         out.append("}");

   173     }

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

   176         final String name = findMethodName(m);

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

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

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

   180     }

   182     private void generateInstanceMethod(Method m) throws IOException {

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

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

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

   186         out.append("(arg0");

   187         String space = ",";

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

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

   190             out.append(space);

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

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

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

   194                 index += 2;

   195             } else {

   196                 index++;

   197             }

   198         }

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

   200         final Code code = m.getCode();

   201         if (code != null) {

   202             int len = code.getMaxLocals();

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

   204                 out.append("  var ");

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

   206             }

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

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

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

   210             produceCode(code.getByteCodes());

   211         } else {

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

   213         }

   214         out.append("}");

   215     }

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

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

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

   220             int prev = i;

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

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

   223             switch (c) {

   224                 case bc_aload_0:

   225                 case bc_iload_0:

   226                 case bc_lload_0:

   227                 case bc_fload_0:

   228                 case bc_dload_0:

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

   230                     break;

   231                 case bc_aload_1:

   232                 case bc_iload_1:

   233                 case bc_lload_1:

   234                 case bc_fload_1:

   235                 case bc_dload_1:

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

   237                     break;

   238                 case bc_aload_2:

   239                 case bc_iload_2:

   240                 case bc_lload_2:

   241                 case bc_fload_2:

   242                 case bc_dload_2:

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

   244                     break;

   245                 case bc_aload_3:

   246                 case bc_iload_3:

   247                 case bc_lload_3:

   248                 case bc_fload_3:

   249                 case bc_dload_3:

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

   251                     break;

   252                 case bc_iload:

   253                 case bc_lload:

   254                 case bc_fload:

   255                 case bc_dload:

   256                 case bc_aload: {

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

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

   259                     break;

   260                 }

   261                 case bc_istore:

   262                 case bc_lstore:

   263                 case bc_fstore:

   264                 case bc_dstore:

   265                 case bc_astore: {

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

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

   268                     break;

   269                 }

   270                 case bc_astore_0:

   271                 case bc_istore_0:

   272                 case bc_lstore_0:

   273                 case bc_fstore_0:

   274                 case bc_dstore_0:

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

   276                     break;

   277                 case bc_astore_1:

   278                 case bc_istore_1:

   279                 case bc_lstore_1:

   280                 case bc_fstore_1:

   281                 case bc_dstore_1:

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

   283                     break;

   284                 case bc_astore_2:

   285                 case bc_istore_2:

   286                 case bc_lstore_2:

   287                 case bc_fstore_2:

   288                 case bc_dstore_2:

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

   290                     break;

   291                 case bc_astore_3:

   292                 case bc_istore_3:

   293                 case bc_lstore_3:

   294                 case bc_fstore_3:

   295                 case bc_dstore_3:

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

   297                     break;

   298                 case bc_iadd:

   299                 case bc_ladd:

   300                 case bc_fadd:

   301                 case bc_dadd:

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

   303                     break;

   304                 case bc_isub:

   305                 case bc_lsub:

   306                 case bc_fsub:

   307                 case bc_dsub:

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

   309                     break;

   310                 case bc_imul:

   311                 case bc_lmul:

   312                 case bc_fmul:

   313                 case bc_dmul:

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

   315                     break;

   316                 case bc_idiv:

   317                 case bc_ldiv:

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

   319                     break;

   320                 case bc_fdiv:

   321                 case bc_ddiv:

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

   323                     break;

   324                 case bc_iand:

   325                 case bc_land:

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

   327                     break;

   328                 case bc_ior:

   329                 case bc_lor:

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

   331                     break;

   332                 case bc_ixor:

   333                 case bc_lxor:

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

   335                     break;

   336                 case bc_ineg:

   337                 case bc_lneg:

   338                 case bc_fneg:

   339                 case bc_dneg:

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

   341                     break;

   342                 case bc_ishl:

   343                 case bc_lshl:

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

   345                     break;

   346                 case bc_ishr:

   347                 case bc_lshr:

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

   349                     break;

   350                 case bc_iushr:

   351                 case bc_lushr:

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

   353                     break;

   354                 case bc_iinc: {

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

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

   357                     if (incrBy == 1) {

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

   359                     } else {

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

   361                     }

   362                     break;

   363                 }

   364                 case bc_return:

   365                     out.append("return;");

   366                     break;

   367                 case bc_ireturn:

   368                 case bc_lreturn:

   369                 case bc_freturn:

   370                 case bc_dreturn:

   371                 case bc_areturn:

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

   373                     break;

   374                 case bc_i2l:

   375                 case bc_i2f:

   376                 case bc_i2d:

   377                 case bc_l2i:

   378                     // max int check?

   379                 case bc_l2f:

   380                 case bc_l2d:

   381                 case bc_f2d:

   382                 case bc_d2f:

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

   384                     break;

   385                 case bc_f2i:

   386                 case bc_f2l:

   387                 case bc_d2i:

   388                 case bc_d2l:

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

   390                     break;

   391                 case bc_i2b:

   392                 case bc_i2c:

   393                 case bc_i2s:

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

   395                     break;

   396                 case bc_aconst_null:

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

   398                     break;

   399                 case bc_iconst_m1:

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

   401                     break;

   402                 case bc_iconst_0:

   403                 case bc_dconst_0:

   404                 case bc_lconst_0:

   405                 case bc_fconst_0:

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

   407                     break;

   408                 case bc_iconst_1:

   409                 case bc_lconst_1:

   410                 case bc_fconst_1:

   411                 case bc_dconst_1:

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

   413                     break;

   414                 case bc_iconst_2:

   415                 case bc_fconst_2:

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

   417                     break;

   418                 case bc_iconst_3:

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

   420                     break;

   421                 case bc_iconst_4:

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

   423                     break;

   424                 case bc_iconst_5:

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

   426                     break;

   427                 case bc_ldc: {

   428                     int indx = byteCodes[++i];

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

   430                     String v = encodeConstant(entry);

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

   432                     break;

   433                 }

   434                 case bc_ldc_w:

   435                 case bc_ldc2_w: {

   436                     int indx = readIntArg(byteCodes, i);

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

   438                     i += 2;

   439                     String v = encodeConstant(entry);

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

   441                     break;

   442                 }

   443                 case bc_lcmp:

   444                 case bc_fcmpl:

   445                 case bc_fcmpg:

   446                 case bc_dcmpl:

   447                 case bc_dcmpg: {

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

   449                     break;

   450                 }

   451                 case bc_if_icmpeq: {

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

   453                     break;

   454                 }

   455                 case bc_ifeq: {

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

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

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

   459                     i += 2;

   460                     break;

   461                 }

   462                 case bc_ifne: {

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

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

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

   466                     i += 2;

   467                     break;

   468                 }

   469                 case bc_iflt: {

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

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

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

   473                     i += 2;

   474                     break;

   475                 }

   476                 case bc_ifle: {

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

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

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

   480                     i += 2;

   481                     break;

   482                 }

   483                 case bc_ifgt: {

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

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

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

   487                     i += 2;

   488                     break;

   489                 }

   490                 case bc_ifge: {

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

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

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

   494                     i += 2;

   495                     break;

   496                 }

   497                 case bc_ifnonnull: {

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

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

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

   501                     i += 2;

   502                     break;

   503                 }

   504                 case bc_ifnull: {

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

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

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

   508                     i += 2;

   509                     break;

   510                 }

   511                 case bc_if_icmpne:

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

   513                     break;

   514                 case bc_if_icmplt:

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

   516                     break;

   517                 case bc_if_icmple:

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

   519                     break;

   520                 case bc_if_icmpgt:

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

   522                     break;

   523                 case bc_if_icmpge:

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

   525                     break;

   526                 case bc_goto: {

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

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

   529                     i += 2;

   530                     break;

   531                 }

   532                 case bc_invokeinterface: {

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

   534                     break;

   535                 }

   536                 case bc_invokevirtual:

   537                     i = invokeVirtualMethod(byteCodes, i);

   538                     break;

   539                 case bc_invokespecial:

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

   541                     break;

   542                 case bc_invokestatic:

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

   544                     break;

   545                 case bc_new: {

   546                     int indx = readIntArg(byteCodes, i);

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

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

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

   550                     out.append(");");

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

   552                     i += 2;

   553                     break;

   554                 }

   555                 case bc_newarray: {

   556                     int type = byteCodes[i++];

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

   558                     break;

   559                 }

   560                 case bc_anewarray: {

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

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

   563                     break;

   564                 }

   565                 case bc_arraylength:

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

   567                     break;

   568                 case bc_iastore:

   569                 case bc_lastore:

   570                 case bc_fastore:

   571                 case bc_dastore:

   572                 case bc_aastore:

   573                 case bc_bastore:

   574                 case bc_castore:

   575                 case bc_sastore: {

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

   577                     break;

   578                 }

   579                 case bc_iaload:

   580                 case bc_laload:

   581                 case bc_faload:

   582                 case bc_daload:

   583                 case bc_aaload:

   584                 case bc_baload:

   585                 case bc_caload:

   586                 case bc_saload: {

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

   588                     break;

   589                 }

   590                 case bc_pop2:

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

   592                 case bc_pop:

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

   594                     break;

   595                 case bc_dup:

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

   597                     break;

   598                 case bc_bipush:

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

   600                     break;

   601                 case bc_sipush:

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

   603                     i += 2;

   604                     break;

   605                 case bc_getfield: {

   606                     int indx = readIntArg(byteCodes, i);

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

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

   609                     i += 2;

   610                     break;

   611                 }

   612                 case bc_getstatic: {

   613                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   618                     i += 2;

   619                     addReference(in);

   620                     break;

   621                 }

   622                 case bc_putstatic: {

   623                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   628                     i += 2;

   629                     addReference(in);

   630                     break;

   631                 }

   632                 case bc_putfield: {

   633                     int indx = readIntArg(byteCodes, i);

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

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

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

   637                     i += 2;

   638                     break;

   639                 }

   640                 case bc_checkcast: {

   641                     int indx = readIntArg(byteCodes, i);

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

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

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

   645                         // no way to check arrays right now

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

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

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

   649                     }

   650                     i += 2;

   651                     break;

   652                 }

   653                 case bc_instanceof: {

   654                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   659                     i += 2;

   660                     break;

   661                 }

   663             }

   664             out.append(" //");

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

   666                 out.append(" ");

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

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

   669             }

   670             out.append("\n");

   671         }

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

   673     }

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

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

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

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

   679         return i + 2;

   680     }

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

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

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

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

   686     }

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

   689         int cnt = 0;

   690         int i = 0;

   691         Boolean count = null;

   692         boolean array = false;

   693         int firstPos = sig.length();

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

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

   696             switch (ch) {

   697                 case '(':

   698                     count = true;

   699                     continue;

   700                 case ')':

   701                     count = false;

   702                     continue;

   703                 case 'A':

   704                     array = true;

   705                     break;

   706                 case 'B':

   707                 case 'C':

   708                 case 'D':

   709                 case 'F':

   710                 case 'I':

   711                 case 'J':

   712                 case 'S':

   713                 case 'Z':

   714                     if (count) {

   715                         cnt++;

   716                         if (array) {

   717                             sig.append('A');

   718                         }

   719                         sig.append(ch);

   720                     } else {

   721                         hasReturnType[0] = true;

   722                         sig.insert(firstPos, ch);

   723                         if (array) {

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

   725                         }

   726                     }

   727                     array = false;

   728                     continue;

   729                 case 'V':

   730                     assert !count;

   731                     hasReturnType[0] = false;

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

   733                     continue;

   734                 case 'L':

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

   736                     if (count) {

   737                         cnt++;

   738                         if (array) {

   739                             sig.append('A');

   740                         }

   741                         sig.append(ch);

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

   743                     } else {

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

   745                         sig.insert(firstPos, ch);

   746                         if (array) {

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

   748                         }

   749                         hasReturnType[0] = true;

   750                     }

   751                     i = next + 1;

   752                     continue;

   753                 case '[':

   754                     //arrays++;

   755                     continue;

   756                 default:

   757                     break; // invalid character

   758             }

   759         }

   760         return cnt;

   761     }

   763     private void generateStaticField(Variable v) throws IOException {

   764         out.append("\nvar ")

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

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

   767     }

   769     private String findMethodName(Method m) {

   770         StringBuilder name = new StringBuilder();

   771         String descr = m.getDescriptor();

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

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

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

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

   776         } else {

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

   778         }

   780         boolean hasReturn[] = { false };

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

   782         return name.toString();

   783     }

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

   786         StringBuilder name = new StringBuilder();

   787         String descr = mi.getDescriptor();

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

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

   790         } else {

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

   792         }

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

   794         return name.toString();

   795     }

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

   798     throws IOException {

   799         int methodIndex = readIntArg(byteCodes, i);

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

   801         boolean[] hasReturn = { false };

   802         int[] cnt = { 0 };

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

   804         out.append("{ ");

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

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

   807         }

   809         if (hasReturn[0]) {

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

   811         }

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

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

   814         out.append('_');

   815         out.append(mn);

   816         out.append('(');

   817         String sep = "";

   818         if (!isStatic) {

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

   820             sep = ", ";

   821         }

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

   823             out.append(sep);

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

   825             sep = ", ";

   826         }

   827         out.append(")");

   828         if (hasReturn[0]) {

   829             out.append(")");

   830         }

   831         out.append("; }");

   832         i += 2;

   833         addReference(in);

   834         return i;

   835     }

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

   837     throws IOException {

   838         int methodIndex = readIntArg(byteCodes, i);

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

   840         boolean[] hasReturn = { false };

   841         int[] cnt = { 0 };

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

   843         out.append("{ ");

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

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

   846         }

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

   848         if (hasReturn[0]) {

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

   850         }

   851         out.append("self.");

   852         out.append(mn);

   853         out.append('(');

   854         out.append("self");

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

   856             out.append(", ");

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

   858         }

   859         out.append(")");

   860         if (hasReturn[0]) {

   861             out.append(")");

   862         }

   863         out.append("; }");

   864         i += 2;

   865         return i;

   866     }

   868     private void addReference(String cn) {

   869         if (references != null) {

   870             references.add(cn);

   871         }

   872     }

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

   875         int arr = 0;

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

   877             out.append('A');

   878             d = d.substring(1);

   879         }

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

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

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

   883         } else {

   884             out.append(d);

   885         }

   886     }

   888     private String encodeConstant(CPEntry entry) {

   889         final String v;

   890         if (entry instanceof CPClassInfo) {

   891             v = "new java_lang_Class";

   892         } else if (entry instanceof CPStringInfo) {

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

   894         } else {

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

   896         }

   897         return v;

   898     }

   900     private String findDescriptor(String d) {

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

   902     }

   903 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Mon, 08 Oct 2012 17:10:27 -0700
branch	emul
changeset 93	a236a9f137ac
parent 92	bf4f95784c62
child 94	19497b4312bb
permissions	-rw-r--r--