hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@1376481f15e7

     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.apidesign.bck2brwsr.core.JavaScriptBody;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    46  *

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

    48  */

    49 public final class ByteCodeToJavaScript {

    50     private final ClassFile jc;

    51     private final Appendable out;

    52     private final Collection<? super String> references;

    54     private ByteCodeToJavaScript(

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

    56     ) {

    57         this.jc = jc;

    58         this.out = out;

    59         this.references = references;

    60     }

    62     /**

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

    64      *

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

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

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

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

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

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

    71      *   if one is not interested in knowing references

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

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

    74      *

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

    76      */

    78     public static String compile(

    79         InputStream classFile, Appendable out,

    80         Collection<? super String> references,

    81         Collection<? super String> scripts

    82     ) throws IOException {

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

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

    85         Annotation a = jc.getAnnotation(extraAnn);

    86         if (a != null) {

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

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

    89             scripts.add(res);

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

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

    92                 return null;

    93             }

    94         }

    96         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

    97             jc, out, references

    98         );

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

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

   101             if (m.isStatic()) {

   102                 compiler.generateStaticMethod(m, toInitilize);

   103             } else {

   104                 compiler.generateInstanceMethod(m);

   105             }

   106         }

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

   108             if (v.isStatic()) {

   109                 compiler.generateStaticField(v);

   110             }

   111         }

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

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

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

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

   117             if (!v.isStatic()) {

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

   119             }

   120         }

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

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

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

   124         out.append("\n    return ").append(className).append(".prototype;");

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

   126         ClassName sc = jc.getSuperClass();

   127         if (sc != null) {

   128             out.append("\n  ").append(sc.getInternalName().replace('/', '_')).append("_proto();");

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

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

   131         }

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

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

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

   135             }

   136         }

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

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

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

   140         }

   141         out.append("\n  return ").append(className).append(".prototype;");

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

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

   144         StringBuilder sb = new StringBuilder();

   145         for (String init : toInitilize) {

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

   147         }

   148         return sb.toString();

   149     }

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

   151         if (javaScriptBody(m, true)) {

   152             return;

   153         }

   154         final String mn = findMethodName(m);

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

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

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

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

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

   160         }

   161         out.append('(');

   162         String space = "";

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

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

   165             out.append(space);

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

   167             space = ",";

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

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

   170                 index += 2;

   171             } else {

   172                 index++;

   173             }

   174         }

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

   176         final Code code = m.getCode();

   177         if (code != null) {

   178             int len = code.getMaxLocals();

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

   180                 out.append("  var ");

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

   182             }

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

   184             produceCode(code.getByteCodes());

   185         } else {

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

   187         }

   188         out.append("}");

   189     }

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

   192         final String name = findMethodName(m);

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

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

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

   196     }

   198     private void generateInstanceMethod(Method m) throws IOException {

   199         if (javaScriptBody(m, false)) {

   200             return;

   201         }

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

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

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

   205         out.append("(arg0");

   206         String space = ",";

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

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

   209             out.append(space);

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

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

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

   213                 index += 2;

   214             } else {

   215                 index++;

   216             }

   217         }

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

   219         final Code code = m.getCode();

   220         if (code != null) {

   221             int len = code.getMaxLocals();

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

   223                 out.append("  var ");

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

   225             }

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

   227             produceCode(code.getByteCodes());

   228         } else {

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

   230         }

   231         out.append("}");

   232     }

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

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

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

   237             int prev = i;

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

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

   240             switch (c) {

   241                 case bc_aload_0:

   242                 case bc_iload_0:

   243                 case bc_lload_0:

   244                 case bc_fload_0:

   245                 case bc_dload_0:

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

   247                     break;

   248                 case bc_aload_1:

   249                 case bc_iload_1:

   250                 case bc_lload_1:

   251                 case bc_fload_1:

   252                 case bc_dload_1:

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

   254                     break;

   255                 case bc_aload_2:

   256                 case bc_iload_2:

   257                 case bc_lload_2:

   258                 case bc_fload_2:

   259                 case bc_dload_2:

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

   261                     break;

   262                 case bc_aload_3:

   263                 case bc_iload_3:

   264                 case bc_lload_3:

   265                 case bc_fload_3:

   266                 case bc_dload_3:

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

   268                     break;

   269                 case bc_iload:

   270                 case bc_lload:

   271                 case bc_fload:

   272                 case bc_dload:

   273                 case bc_aload: {

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

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

   276                     break;

   277                 }

   278                 case bc_istore:

   279                 case bc_lstore:

   280                 case bc_fstore:

   281                 case bc_dstore:

   282                 case bc_astore: {

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

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

   285                     break;

   286                 }

   287                 case bc_astore_0:

   288                 case bc_istore_0:

   289                 case bc_lstore_0:

   290                 case bc_fstore_0:

   291                 case bc_dstore_0:

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

   293                     break;

   294                 case bc_astore_1:

   295                 case bc_istore_1:

   296                 case bc_lstore_1:

   297                 case bc_fstore_1:

   298                 case bc_dstore_1:

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

   300                     break;

   301                 case bc_astore_2:

   302                 case bc_istore_2:

   303                 case bc_lstore_2:

   304                 case bc_fstore_2:

   305                 case bc_dstore_2:

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

   307                     break;

   308                 case bc_astore_3:

   309                 case bc_istore_3:

   310                 case bc_lstore_3:

   311                 case bc_fstore_3:

   312                 case bc_dstore_3:

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

   314                     break;

   315                 case bc_iadd:

   316                 case bc_ladd:

   317                 case bc_fadd:

   318                 case bc_dadd:

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

   320                     break;

   321                 case bc_isub:

   322                 case bc_lsub:

   323                 case bc_fsub:

   324                 case bc_dsub:

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

   326                     break;

   327                 case bc_imul:

   328                 case bc_lmul:

   329                 case bc_fmul:

   330                 case bc_dmul:

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

   332                     break;

   333                 case bc_idiv:

   334                 case bc_ldiv:

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

   336                     break;

   337                 case bc_fdiv:

   338                 case bc_ddiv:

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

   340                     break;

   341                 case bc_iand:

   342                 case bc_land:

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

   344                     break;

   345                 case bc_ior:

   346                 case bc_lor:

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

   348                     break;

   349                 case bc_ixor:

   350                 case bc_lxor:

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

   352                     break;

   353                 case bc_ineg:

   354                 case bc_lneg:

   355                 case bc_fneg:

   356                 case bc_dneg:

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

   358                     break;

   359                 case bc_ishl:

   360                 case bc_lshl:

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

   362                     break;

   363                 case bc_ishr:

   364                 case bc_lshr:

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

   366                     break;

   367                 case bc_iushr:

   368                 case bc_lushr:

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

   370                     break;

   371                 case bc_iinc: {

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

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

   374                     if (incrBy == 1) {

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

   376                     } else {

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

   378                     }

   379                     break;

   380                 }

   381                 case bc_return:

   382                     out.append("return;");

   383                     break;

   384                 case bc_ireturn:

   385                 case bc_lreturn:

   386                 case bc_freturn:

   387                 case bc_dreturn:

   388                 case bc_areturn:

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

   390                     break;

   391                 case bc_i2l:

   392                 case bc_i2f:

   393                 case bc_i2d:

   394                 case bc_l2i:

   395                     // max int check?

   396                 case bc_l2f:

   397                 case bc_l2d:

   398                 case bc_f2d:

   399                 case bc_d2f:

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

   401                     break;

   402                 case bc_f2i:

   403                 case bc_f2l:

   404                 case bc_d2i:

   405                 case bc_d2l:

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

   407                     break;

   408                 case bc_i2b:

   409                 case bc_i2c:

   410                 case bc_i2s:

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

   412                     break;

   413                 case bc_aconst_null:

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

   415                     break;

   416                 case bc_iconst_m1:

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

   418                     break;

   419                 case bc_iconst_0:

   420                 case bc_dconst_0:

   421                 case bc_lconst_0:

   422                 case bc_fconst_0:

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

   424                     break;

   425                 case bc_iconst_1:

   426                 case bc_lconst_1:

   427                 case bc_fconst_1:

   428                 case bc_dconst_1:

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

   430                     break;

   431                 case bc_iconst_2:

   432                 case bc_fconst_2:

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

   434                     break;

   435                 case bc_iconst_3:

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

   437                     break;

   438                 case bc_iconst_4:

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

   440                     break;

   441                 case bc_iconst_5:

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

   443                     break;

   444                 case bc_ldc: {

   445                     int indx = byteCodes[++i];

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

   447                     String v = encodeConstant(entry);

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

   449                     break;

   450                 }

   451                 case bc_ldc_w:

   452                 case bc_ldc2_w: {

   453                     int indx = readIntArg(byteCodes, i);

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

   455                     i += 2;

   456                     String v = encodeConstant(entry);

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

   458                     break;

   459                 }

   460                 case bc_lcmp:

   461                 case bc_fcmpl:

   462                 case bc_fcmpg:

   463                 case bc_dcmpl:

   464                 case bc_dcmpg: {

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

   466                     break;

   467                 }

   468                 case bc_if_acmpeq:

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

   470                     break;

   471                 case bc_if_acmpne:

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

   473                     break;

   474                 case bc_if_icmpeq: {

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

   476                     break;

   477                 }

   478                 case bc_ifeq: {

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

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

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

   482                     i += 2;

   483                     break;

   484                 }

   485                 case bc_ifne: {

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

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

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

   489                     i += 2;

   490                     break;

   491                 }

   492                 case bc_iflt: {

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

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

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

   496                     i += 2;

   497                     break;

   498                 }

   499                 case bc_ifle: {

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

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

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

   503                     i += 2;

   504                     break;

   505                 }

   506                 case bc_ifgt: {

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

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

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

   510                     i += 2;

   511                     break;

   512                 }

   513                 case bc_ifge: {

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

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

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

   517                     i += 2;

   518                     break;

   519                 }

   520                 case bc_ifnonnull: {

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

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

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

   524                     i += 2;

   525                     break;

   526                 }

   527                 case bc_ifnull: {

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

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

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

   531                     i += 2;

   532                     break;

   533                 }

   534                 case bc_if_icmpne:

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

   536                     break;

   537                 case bc_if_icmplt:

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

   539                     break;

   540                 case bc_if_icmple:

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

   542                     break;

   543                 case bc_if_icmpgt:

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

   545                     break;

   546                 case bc_if_icmpge:

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

   548                     break;

   549                 case bc_goto: {

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

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

   552                     i += 2;

   553                     break;

   554                 }

   555                 case bc_invokeinterface: {

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

   557                     break;

   558                 }

   559                 case bc_invokevirtual:

   560                     i = invokeVirtualMethod(byteCodes, i);

   561                     break;

   562                 case bc_invokespecial:

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

   564                     break;

   565                 case bc_invokestatic:

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

   567                     break;

   568                 case bc_new: {

   569                     int indx = readIntArg(byteCodes, i);

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

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

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

   573                     out.append(");");

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

   575                     i += 2;

   576                     break;

   577                 }

   578                 case bc_newarray: {

   579                     int type = byteCodes[i++];

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

   581                     break;

   582                 }

   583                 case bc_anewarray: {

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

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

   586                     break;

   587                 }

   588                 case bc_arraylength:

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

   590                     break;

   591                 case bc_iastore:

   592                 case bc_lastore:

   593                 case bc_fastore:

   594                 case bc_dastore:

   595                 case bc_aastore:

   596                 case bc_bastore:

   597                 case bc_castore:

   598                 case bc_sastore: {

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

   600                     break;

   601                 }

   602                 case bc_iaload:

   603                 case bc_laload:

   604                 case bc_faload:

   605                 case bc_daload:

   606                 case bc_aaload:

   607                 case bc_baload:

   608                 case bc_caload:

   609                 case bc_saload: {

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

   611                     break;

   612                 }

   613                 case bc_pop2:

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

   615                 case bc_pop:

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

   617                     break;

   618                 case bc_dup:

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

   620                     break;

   621                 case bc_bipush:

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

   623                     break;

   624                 case bc_sipush:

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

   626                     i += 2;

   627                     break;

   628                 case bc_getfield: {

   629                     int indx = readIntArg(byteCodes, i);

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

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

   632                     i += 2;

   633                     break;

   634                 }

   635                 case bc_getstatic: {

   636                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   641                     i += 2;

   642                     addReference(in);

   643                     break;

   644                 }

   645                 case bc_putstatic: {

   646                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   651                     i += 2;

   652                     addReference(in);

   653                     break;

   654                 }

   655                 case bc_putfield: {

   656                     int indx = readIntArg(byteCodes, i);

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

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

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

   660                     i += 2;

   661                     break;

   662                 }

   663                 case bc_checkcast: {

   664                     int indx = readIntArg(byteCodes, i);

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

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

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

   668                         // no way to check arrays right now

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

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

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

   672                     }

   673                     i += 2;

   674                     break;

   675                 }

   676                 case bc_instanceof: {

   677                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   682                     i += 2;

   683                     break;

   684                 }

   685                 case bc_athrow: {

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

   687                     break;

   688                 }

   689                 default: {

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

   691                 }

   693             }

   694             out.append(" //");

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

   696                 out.append(" ");

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

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

   699             }

   700             out.append("\n");

   701         }

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

   703     }

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

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

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

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

   709         return i + 2;

   710     }

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

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

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

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

   716     }

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

   719         int cnt = 0;

   720         int i = 0;

   721         Boolean count = null;

   722         boolean array = false;

   723         int firstPos = sig.length();

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

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

   726             switch (ch) {

   727                 case '(':

   728                     count = true;

   729                     continue;

   730                 case ')':

   731                     count = false;

   732                     continue;

   733                 case 'A':

   734                     array = true;

   735                     break;

   736                 case 'B':

   737                 case 'C':

   738                 case 'D':

   739                 case 'F':

   740                 case 'I':

   741                 case 'J':

   742                 case 'S':

   743                 case 'Z':

   744                     if (count) {

   745                         cnt++;

   746                         if (array) {

   747                             sig.append('A');

   748                         }

   749                         sig.append(ch);

   750                     } else {

   751                         hasReturnType[0] = true;

   752                         sig.insert(firstPos, ch);

   753                         if (array) {

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

   755                         }

   756                     }

   757                     array = false;

   758                     continue;

   759                 case 'V':

   760                     assert !count;

   761                     hasReturnType[0] = false;

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

   763                     continue;

   764                 case 'L':

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

   766                     if (count) {

   767                         cnt++;

   768                         if (array) {

   769                             sig.append('A');

   770                         }

   771                         sig.append(ch);

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

   773                     } else {

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

   775                         sig.insert(firstPos, ch);

   776                         if (array) {

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

   778                         }

   779                         hasReturnType[0] = true;

   780                     }

   781                     i = next + 1;

   782                     continue;

   783                 case '[':

   784                     //arrays++;

   785                     continue;

   786                 default:

   787                     break; // invalid character

   788             }

   789         }

   790         return cnt;

   791     }

   793     private void generateStaticField(Variable v) throws IOException {

   794         out.append("\nvar ")

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

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

   797     }

   799     private String findMethodName(Method m) {

   800         StringBuilder name = new StringBuilder();

   801         String descr = m.getDescriptor();

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

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

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

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

   806         } else {

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

   808         }

   810         boolean hasReturn[] = { false };

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

   812         return name.toString();

   813     }

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

   816         StringBuilder name = new StringBuilder();

   817         String descr = mi.getDescriptor();

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

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

   820         } else {

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

   822         }

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

   824         return name.toString();

   825     }

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

   828     throws IOException {

   829         int methodIndex = readIntArg(byteCodes, i);

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

   831         boolean[] hasReturn = { false };

   832         int[] cnt = { 0 };

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

   834         out.append("{ ");

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

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

   837         }

   839         if (hasReturn[0]) {

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

   841         }

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

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

   844         if (isStatic) {

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

   846         } else {

   847             out.append('_');

   848         }

   849         out.append(mn);

   850         out.append('(');

   851         String sep = "";

   852         if (!isStatic) {

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

   854             sep = ", ";

   855         }

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

   857             out.append(sep);

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

   859             sep = ", ";

   860         }

   861         out.append(")");

   862         if (hasReturn[0]) {

   863             out.append(")");

   864         }

   865         out.append("; }");

   866         i += 2;

   867         addReference(in);

   868         return i;

   869     }

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

   871     throws IOException {

   872         int methodIndex = readIntArg(byteCodes, i);

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

   874         boolean[] hasReturn = { false };

   875         int[] cnt = { 0 };

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

   877         out.append("{ ");

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

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

   880         }

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

   882         if (hasReturn[0]) {

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

   884         }

   885         out.append("self.");

   886         out.append(mn);

   887         out.append('(');

   888         out.append("self");

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

   890             out.append(", ");

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

   892         }

   893         out.append(")");

   894         if (hasReturn[0]) {

   895             out.append(")");

   896         }

   897         out.append("; }");

   898         i += 2;

   899         return i;

   900     }

   902     private void addReference(String cn) throws IOException {

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

   904         if (references != null) {

   905             references.add(cn);

   906         }

   907     }

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

   910         int arr = 0;

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

   912             out.append('A');

   913             d = d.substring(1);

   914         }

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

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

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

   918         } else {

   919             out.append(d);

   920         }

   921     }

   923     private String encodeConstant(CPEntry entry) {

   924         final String v;

   925         if (entry instanceof CPClassInfo) {

   926             v = "new java_lang_Class";

   927         } else if (entry instanceof CPStringInfo) {

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

   929         } else {

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

   931         }

   932         return v;

   933     }

   935     private String findDescriptor(String d) {

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

   937     }

   939     private boolean javaScriptBody(Method m, boolean isStatic) throws IOException {

   940         final ClassName extraAnn = ClassName.getClassName(JavaScriptBody.class.getName().replace('.', '/'));

   941         Annotation a = m.getAnnotation(extraAnn);

   942         if (a != null) {

   943             final ElementValue annVal = a.getComponent("body").getValue();

   944             String body = ((PrimitiveElementValue) annVal).getValue().getValue().toString();

   946             final ArrayElementValue arrVal = (ArrayElementValue) a.getComponent("args").getValue();

   947             final int len = arrVal.getValues().length;

   948             String[] names = new String[len];

   949             for (int i = 0; i < len; i++) {

   950                 names[i] = ((PrimitiveElementValue) arrVal.getValues()[i]).getValue().getValue().toString();

   951             }

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

   953                 jc.getName().getInternalName().replace('/', '_')).append('_').append(findMethodName(m));

   954             out.append("(");

   955             String space;

   956             int index;

   957             if (!isStatic) {

   958                 out.append(names[0]);

   959                 space = ",";

   960                 index = 1;

   961             } else {

   962                 space = "";

   963                 index = 0;

   964             }

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

   966             for (int i = 0; i < args.size(); i++) {

   967                 out.append(space);

   968                 out.append(names[index]);

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

   970                 index++;

   971                 space = ",";

   972             }

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

   974             out.append(body);

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

   976             return true;

   977         }

   978         return false;

   979     }

   980 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Tue, 16 Oct 2012 11:55:56 +0200
changeset 104	1376481f15e7
parent 103	e8438996d406
child 106	346633cd13d6
permissions	-rw-r--r--