hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@346633cd13d6

     1 /**

     2  * Back 2 Browser Bytecode Translator

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

     4  *

     5  * This program is free software: you can redistribute it and/or modify

     6  * it under the terms of the GNU General Public License as published by

     7  * the Free Software Foundation, version 2 of the License.

     8  *

     9  * This program is distributed in the hope that it will be useful,

    10  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12  * GNU General Public License for more details.

    13  *

    14  * You should have received a copy of the GNU General Public License

    15  * along with this program. Look for COPYING file in the top folder.

    16  * If not, see http://opensource.org/licenses/GPL-2.0.

    17  */

    18 /*

    19 Java 4 Browser Bytecode Translator

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

    22 This program is free software: you can redistribute it and/or modify

    23 it under the terms of the GNU General Public License as published by

    24 the Free Software Foundation, version 2 of the License.

    26 This program is distributed in the hope that it will be useful,

    27 but WITHOUT ANY WARRANTY; without even the implied warranty of

    28 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    29 GNU General Public License for more details.

    31 You should have received a copy of the GNU General Public License

    32 along with this program. Look for COPYING file in the top folder.

    33 If not, see http://opensource.org/licenses/GPL-2.0.

    34 */

    35 package org.apidesign.vm4brwsr;

    37 import java.io.IOException;

    38 import java.io.InputStream;

    39 import java.util.ArrayList;

    40 import java.util.Collection;

    41 import java.util.List;

    42 import org.apidesign.bck2brwsr.core.ExtraJavaScript;

    43 import org.apidesign.bck2brwsr.core.JavaScriptBody;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    63  *

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

    65  */

    66 public final class ByteCodeToJavaScript {

    67     private final ClassFile jc;

    68     private final Appendable out;

    69     private final Collection<? super String> references;

    71     private ByteCodeToJavaScript(

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

    73     ) {

    74         this.jc = jc;

    75         this.out = out;

    76         this.references = references;

    77     }

    79     /**

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

    81      *

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

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

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

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

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

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

    88      *   if one is not interested in knowing references

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

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

    91      *

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

    93      */

    95     public static String compile(

    96         InputStream classFile, Appendable out,

    97         Collection<? super String> references,

    98         Collection<? super String> scripts

    99     ) throws IOException {

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

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

   102         Annotation a = jc.getAnnotation(extraAnn);

   103         if (a != null) {

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

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

   106             scripts.add(res);

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

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

   109                 return null;

   110             }

   111         }

   113         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

   114             jc, out, references

   115         );

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

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

   118             if (m.isStatic()) {

   119                 compiler.generateStaticMethod(m, toInitilize);

   120             } else {

   121                 compiler.generateInstanceMethod(m);

   122             }

   123         }

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

   125             if (v.isStatic()) {

   126                 compiler.generateStaticField(v);

   127             }

   128         }

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

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

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

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

   134             if (!v.isStatic()) {

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

   136             }

   137         }

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

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

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

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

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

   143         ClassName sc = jc.getSuperClass();

   144         if (sc != null) {

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

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

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

   148         }

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

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

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

   152             }

   153         }

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

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

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

   157         }

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

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

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

   161         StringBuilder sb = new StringBuilder();

   162         for (String init : toInitilize) {

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

   164         }

   165         return sb.toString();

   166     }

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

   168         if (javaScriptBody(m, true)) {

   169             return;

   170         }

   171         final String mn = findMethodName(m);

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

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

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

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

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

   177         }

   178         out.append('(');

   179         String space = "";

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

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

   182             out.append(space);

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

   184             space = ",";

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

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

   187                 index += 2;

   188             } else {

   189                 index++;

   190             }

   191         }

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

   193         final Code code = m.getCode();

   194         if (code != null) {

   195             int len = code.getMaxLocals();

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

   197                 out.append("  var ");

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

   199             }

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

   201             produceCode(code.getByteCodes());

   202         } else {

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

   204         }

   205         out.append("}");

   206     }

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

   209         final String name = findMethodName(m);

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

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

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

   213     }

   215     private void generateInstanceMethod(Method m) throws IOException {

   216         if (javaScriptBody(m, false)) {

   217             return;

   218         }

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

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

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

   222         out.append("(arg0");

   223         String space = ",";

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

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

   226             out.append(space);

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

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

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

   230                 index += 2;

   231             } else {

   232                 index++;

   233             }

   234         }

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

   236         final Code code = m.getCode();

   237         if (code != null) {

   238             int len = code.getMaxLocals();

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

   240                 out.append("  var ");

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

   242             }

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

   244             produceCode(code.getByteCodes());

   245         } else {

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

   247         }

   248         out.append("}");

   249     }

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

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

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

   254             int prev = i;

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

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

   257             switch (c) {

   258                 case bc_aload_0:

   259                 case bc_iload_0:

   260                 case bc_lload_0:

   261                 case bc_fload_0:

   262                 case bc_dload_0:

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

   264                     break;

   265                 case bc_aload_1:

   266                 case bc_iload_1:

   267                 case bc_lload_1:

   268                 case bc_fload_1:

   269                 case bc_dload_1:

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

   271                     break;

   272                 case bc_aload_2:

   273                 case bc_iload_2:

   274                 case bc_lload_2:

   275                 case bc_fload_2:

   276                 case bc_dload_2:

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

   278                     break;

   279                 case bc_aload_3:

   280                 case bc_iload_3:

   281                 case bc_lload_3:

   282                 case bc_fload_3:

   283                 case bc_dload_3:

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

   285                     break;

   286                 case bc_iload:

   287                 case bc_lload:

   288                 case bc_fload:

   289                 case bc_dload:

   290                 case bc_aload: {

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

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

   293                     break;

   294                 }

   295                 case bc_istore:

   296                 case bc_lstore:

   297                 case bc_fstore:

   298                 case bc_dstore:

   299                 case bc_astore: {

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

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

   302                     break;

   303                 }

   304                 case bc_astore_0:

   305                 case bc_istore_0:

   306                 case bc_lstore_0:

   307                 case bc_fstore_0:

   308                 case bc_dstore_0:

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

   310                     break;

   311                 case bc_astore_1:

   312                 case bc_istore_1:

   313                 case bc_lstore_1:

   314                 case bc_fstore_1:

   315                 case bc_dstore_1:

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

   317                     break;

   318                 case bc_astore_2:

   319                 case bc_istore_2:

   320                 case bc_lstore_2:

   321                 case bc_fstore_2:

   322                 case bc_dstore_2:

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

   324                     break;

   325                 case bc_astore_3:

   326                 case bc_istore_3:

   327                 case bc_lstore_3:

   328                 case bc_fstore_3:

   329                 case bc_dstore_3:

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

   331                     break;

   332                 case bc_iadd:

   333                 case bc_ladd:

   334                 case bc_fadd:

   335                 case bc_dadd:

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

   337                     break;

   338                 case bc_isub:

   339                 case bc_lsub:

   340                 case bc_fsub:

   341                 case bc_dsub:

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

   343                     break;

   344                 case bc_imul:

   345                 case bc_lmul:

   346                 case bc_fmul:

   347                 case bc_dmul:

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

   349                     break;

   350                 case bc_idiv:

   351                 case bc_ldiv:

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

   353                     break;

   354                 case bc_fdiv:

   355                 case bc_ddiv:

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

   357                     break;

   358                 case bc_iand:

   359                 case bc_land:

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

   361                     break;

   362                 case bc_ior:

   363                 case bc_lor:

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

   365                     break;

   366                 case bc_ixor:

   367                 case bc_lxor:

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

   369                     break;

   370                 case bc_ineg:

   371                 case bc_lneg:

   372                 case bc_fneg:

   373                 case bc_dneg:

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

   375                     break;

   376                 case bc_ishl:

   377                 case bc_lshl:

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

   379                     break;

   380                 case bc_ishr:

   381                 case bc_lshr:

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

   383                     break;

   384                 case bc_iushr:

   385                 case bc_lushr:

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

   387                     break;

   388                 case bc_iinc: {

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

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

   391                     if (incrBy == 1) {

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

   393                     } else {

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

   395                     }

   396                     break;

   397                 }

   398                 case bc_return:

   399                     out.append("return;");

   400                     break;

   401                 case bc_ireturn:

   402                 case bc_lreturn:

   403                 case bc_freturn:

   404                 case bc_dreturn:

   405                 case bc_areturn:

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

   407                     break;

   408                 case bc_i2l:

   409                 case bc_i2f:

   410                 case bc_i2d:

   411                 case bc_l2i:

   412                     // max int check?

   413                 case bc_l2f:

   414                 case bc_l2d:

   415                 case bc_f2d:

   416                 case bc_d2f:

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

   418                     break;

   419                 case bc_f2i:

   420                 case bc_f2l:

   421                 case bc_d2i:

   422                 case bc_d2l:

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

   424                     break;

   425                 case bc_i2b:

   426                 case bc_i2c:

   427                 case bc_i2s:

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

   429                     break;

   430                 case bc_aconst_null:

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

   432                     break;

   433                 case bc_iconst_m1:

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

   435                     break;

   436                 case bc_iconst_0:

   437                 case bc_dconst_0:

   438                 case bc_lconst_0:

   439                 case bc_fconst_0:

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

   441                     break;

   442                 case bc_iconst_1:

   443                 case bc_lconst_1:

   444                 case bc_fconst_1:

   445                 case bc_dconst_1:

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

   447                     break;

   448                 case bc_iconst_2:

   449                 case bc_fconst_2:

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

   451                     break;

   452                 case bc_iconst_3:

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

   454                     break;

   455                 case bc_iconst_4:

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

   457                     break;

   458                 case bc_iconst_5:

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

   460                     break;

   461                 case bc_ldc: {

   462                     int indx = byteCodes[++i];

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

   464                     String v = encodeConstant(entry);

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

   466                     break;

   467                 }

   468                 case bc_ldc_w:

   469                 case bc_ldc2_w: {

   470                     int indx = readIntArg(byteCodes, i);

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

   472                     i += 2;

   473                     String v = encodeConstant(entry);

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

   475                     break;

   476                 }

   477                 case bc_lcmp:

   478                 case bc_fcmpl:

   479                 case bc_fcmpg:

   480                 case bc_dcmpl:

   481                 case bc_dcmpg: {

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

   483                     break;

   484                 }

   485                 case bc_if_acmpeq:

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

   487                     break;

   488                 case bc_if_acmpne:

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

   490                     break;

   491                 case bc_if_icmpeq: {

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

   493                     break;

   494                 }

   495                 case bc_ifeq: {

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

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

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

   499                     i += 2;

   500                     break;

   501                 }

   502                 case bc_ifne: {

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

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

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

   506                     i += 2;

   507                     break;

   508                 }

   509                 case bc_iflt: {

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

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

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

   513                     i += 2;

   514                     break;

   515                 }

   516                 case bc_ifle: {

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

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

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

   520                     i += 2;

   521                     break;

   522                 }

   523                 case bc_ifgt: {

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

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

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

   527                     i += 2;

   528                     break;

   529                 }

   530                 case bc_ifge: {

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

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

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

   534                     i += 2;

   535                     break;

   536                 }

   537                 case bc_ifnonnull: {

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

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

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

   541                     i += 2;

   542                     break;

   543                 }

   544                 case bc_ifnull: {

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

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

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

   548                     i += 2;

   549                     break;

   550                 }

   551                 case bc_if_icmpne:

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

   553                     break;

   554                 case bc_if_icmplt:

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

   556                     break;

   557                 case bc_if_icmple:

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

   559                     break;

   560                 case bc_if_icmpgt:

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

   562                     break;

   563                 case bc_if_icmpge:

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

   565                     break;

   566                 case bc_goto: {

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

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

   569                     i += 2;

   570                     break;

   571                 }

   572                 case bc_invokeinterface: {

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

   574                     break;

   575                 }

   576                 case bc_invokevirtual:

   577                     i = invokeVirtualMethod(byteCodes, i);

   578                     break;

   579                 case bc_invokespecial:

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

   581                     break;

   582                 case bc_invokestatic:

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

   584                     break;

   585                 case bc_new: {

   586                     int indx = readIntArg(byteCodes, i);

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

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

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

   590                     out.append(");");

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

   592                     i += 2;

   593                     break;

   594                 }

   595                 case bc_newarray: {

   596                     int type = byteCodes[i++];

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

   598                     break;

   599                 }

   600                 case bc_anewarray: {

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

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

   603                     break;

   604                 }

   605                 case bc_arraylength:

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

   607                     break;

   608                 case bc_iastore:

   609                 case bc_lastore:

   610                 case bc_fastore:

   611                 case bc_dastore:

   612                 case bc_aastore:

   613                 case bc_bastore:

   614                 case bc_castore:

   615                 case bc_sastore: {

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

   617                     break;

   618                 }

   619                 case bc_iaload:

   620                 case bc_laload:

   621                 case bc_faload:

   622                 case bc_daload:

   623                 case bc_aaload:

   624                 case bc_baload:

   625                 case bc_caload:

   626                 case bc_saload: {

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

   628                     break;

   629                 }

   630                 case bc_pop2:

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

   632                 case bc_pop:

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

   634                     break;

   635                 case bc_dup:

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

   637                     break;

   638                 case bc_bipush:

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

   640                     break;

   641                 case bc_sipush:

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

   643                     i += 2;

   644                     break;

   645                 case bc_getfield: {

   646                     int indx = readIntArg(byteCodes, i);

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

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

   649                     i += 2;

   650                     break;

   651                 }

   652                 case bc_getstatic: {

   653                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   658                     i += 2;

   659                     addReference(in);

   660                     break;

   661                 }

   662                 case bc_putstatic: {

   663                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   668                     i += 2;

   669                     addReference(in);

   670                     break;

   671                 }

   672                 case bc_putfield: {

   673                     int indx = readIntArg(byteCodes, i);

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

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

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

   677                     i += 2;

   678                     break;

   679                 }

   680                 case bc_checkcast: {

   681                     int indx = readIntArg(byteCodes, i);

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

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

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

   685                         // no way to check arrays right now

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

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

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

   689                     }

   690                     i += 2;

   691                     break;

   692                 }

   693                 case bc_instanceof: {

   694                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   699                     i += 2;

   700                     break;

   701                 }

   702                 case bc_athrow: {

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

   704                     break;

   705                 }

   706                 default: {

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

   708                 }

   710             }

   711             out.append(" //");

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

   713                 out.append(" ");

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

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

   716             }

   717             out.append("\n");

   718         }

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

   720     }

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

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

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

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

   726         return i + 2;

   727     }

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

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

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

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

   733     }

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

   736         int cnt = 0;

   737         int i = 0;

   738         Boolean count = null;

   739         boolean array = false;

   740         int firstPos = sig.length();

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

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

   743             switch (ch) {

   744                 case '(':

   745                     count = true;

   746                     continue;

   747                 case ')':

   748                     count = false;

   749                     continue;

   750                 case 'A':

   751                     array = true;

   752                     break;

   753                 case 'B':

   754                 case 'C':

   755                 case 'D':

   756                 case 'F':

   757                 case 'I':

   758                 case 'J':

   759                 case 'S':

   760                 case 'Z':

   761                     if (count) {

   762                         cnt++;

   763                         if (array) {

   764                             sig.append('A');

   765                         }

   766                         sig.append(ch);

   767                     } else {

   768                         hasReturnType[0] = true;

   769                         sig.insert(firstPos, ch);

   770                         if (array) {

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

   772                         }

   773                     }

   774                     array = false;

   775                     continue;

   776                 case 'V':

   777                     assert !count;

   778                     hasReturnType[0] = false;

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

   780                     continue;

   781                 case 'L':

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

   783                     if (count) {

   784                         cnt++;

   785                         if (array) {

   786                             sig.append('A');

   787                         }

   788                         sig.append(ch);

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

   790                     } else {

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

   792                         sig.insert(firstPos, ch);

   793                         if (array) {

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

   795                         }

   796                         hasReturnType[0] = true;

   797                     }

   798                     i = next + 1;

   799                     continue;

   800                 case '[':

   801                     //arrays++;

   802                     continue;

   803                 default:

   804                     break; // invalid character

   805             }

   806         }

   807         return cnt;

   808     }

   810     private void generateStaticField(Variable v) throws IOException {

   811         out.append("\nvar ")

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

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

   814     }

   816     private String findMethodName(Method m) {

   817         StringBuilder name = new StringBuilder();

   818         String descr = m.getDescriptor();

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

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

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

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

   823         } else {

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

   825         }

   827         boolean hasReturn[] = { false };

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

   829         return name.toString();

   830     }

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

   833         StringBuilder name = new StringBuilder();

   834         String descr = mi.getDescriptor();

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

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

   837         } else {

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

   839         }

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

   841         return name.toString();

   842     }

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

   845     throws IOException {

   846         int methodIndex = readIntArg(byteCodes, i);

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

   848         boolean[] hasReturn = { false };

   849         int[] cnt = { 0 };

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

   851         out.append("{ ");

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

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

   854         }

   856         if (hasReturn[0]) {

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

   858         }

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

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

   861         if (isStatic) {

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

   863         } else {

   864             out.append('_');

   865         }

   866         out.append(mn);

   867         out.append('(');

   868         String sep = "";

   869         if (!isStatic) {

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

   871             sep = ", ";

   872         }

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

   874             out.append(sep);

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

   876             sep = ", ";

   877         }

   878         out.append(")");

   879         if (hasReturn[0]) {

   880             out.append(")");

   881         }

   882         out.append("; }");

   883         i += 2;

   884         addReference(in);

   885         return i;

   886     }

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

   888     throws IOException {

   889         int methodIndex = readIntArg(byteCodes, i);

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

   891         boolean[] hasReturn = { false };

   892         int[] cnt = { 0 };

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

   894         out.append("{ ");

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

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

   897         }

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

   899         if (hasReturn[0]) {

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

   901         }

   902         out.append("self.");

   903         out.append(mn);

   904         out.append('(');

   905         out.append("self");

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

   907             out.append(", ");

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

   909         }

   910         out.append(")");

   911         if (hasReturn[0]) {

   912             out.append(")");

   913         }

   914         out.append("; }");

   915         i += 2;

   916         return i;

   917     }

   919     private void addReference(String cn) throws IOException {

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

   921         if (references != null) {

   922             references.add(cn);

   923         }

   924     }

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

   927         int arr = 0;

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

   929             out.append('A');

   930             d = d.substring(1);

   931         }

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

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

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

   935         } else {

   936             out.append(d);

   937         }

   938     }

   940     private String encodeConstant(CPEntry entry) {

   941         final String v;

   942         if (entry instanceof CPClassInfo) {

   943             v = "new java_lang_Class";

   944         } else if (entry instanceof CPStringInfo) {

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

   946         } else {

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

   948         }

   949         return v;

   950     }

   952     private String findDescriptor(String d) {

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

   954     }

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

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

   958         Annotation a = m.getAnnotation(extraAnn);

   959         if (a != null) {

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

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

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

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

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

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

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

   968             }

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

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

   971             out.append("(");

   972             String space;

   973             int index;

   974             if (!isStatic) {

   975                 out.append(names[0]);

   976                 space = ",";

   977                 index = 1;

   978             } else {

   979                 space = "";

   980                 index = 0;

   981             }

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

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

   984                 out.append(space);

   985                 out.append(names[index]);

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

   987                 index++;

   988                 space = ",";

   989             }

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

   991             out.append(body);

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

   993             return true;

   994         }

   995         return false;

   996     }

   997 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Tue, 16 Oct 2012 12:42:00 +0200
changeset 106	346633cd13d6
parent 104	1376481f15e7
child 115	3d5597011af0
child 285	c8be2d837788
permissions	-rw-r--r--