hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@a206e280acc8

     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 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 new ").append(className).append(";");

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

   126         ClassName sc = jc.getSuperClass();

   127         if (sc != null) {

   128             out.append("\n  var p = ").append(className)

   129                .append(".prototype = ").

   130                 append(sc.getInternalName().replace('/', '_')).append("_proto();");

   131         } else {

   132             out.append("\n  var p = ").append(className).append(".prototype;");

   133         }

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

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

   136                 compiler.generateMethodReference("\n  p.", m);

   137             }

   138         }

   139         out.append("\n  p.$instOf_").append(className).append(" = true;");

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

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

   142         }

   143         out.append("\n  return new ").append(className).append(";");

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

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

   146         StringBuilder sb = new StringBuilder();

   147         for (String init : toInitilize) {

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

   149         }

   150         return sb.toString();

   151     }

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

   153         if (javaScriptBody(m, true)) {

   154             return;

   155         }

   156         final String mn = findMethodName(m);

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

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

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

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

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

   162         }

   163         out.append('(');

   164         String space = "";

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

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

   167             out.append(space);

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

   169             space = ",";

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

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

   172                 index += 2;

   173             } else {

   174                 index++;

   175             }

   176         }

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

   178         final Code code = m.getCode();

   179         if (code != null) {

   180             int len = code.getMaxLocals();

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

   182                 out.append("  var ");

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

   184             }

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

   186             produceCode(code.getByteCodes());

   187         } else {

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

   189         }

   190         out.append("}");

   191     }

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

   194         final String name = findMethodName(m);

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

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

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

   198     }

   200     private void generateInstanceMethod(Method m) throws IOException {

   201         if (javaScriptBody(m, false)) {

   202             return;

   203         }

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

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

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

   207         out.append("(arg0");

   208         String space = ",";

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

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

   211             out.append(space);

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

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

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

   215                 index += 2;

   216             } else {

   217                 index++;

   218             }

   219         }

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

   221         final Code code = m.getCode();

   222         if (code != null) {

   223             int len = code.getMaxLocals();

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

   225                 out.append("  var ");

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

   227             }

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

   229             produceCode(code.getByteCodes());

   230         } else {

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

   232         }

   233         out.append("}");

   234     }

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

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

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

   239             int prev = i;

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

   241             final int c = readByte(byteCodes, i);

   242             switch (c) {

   243                 case bc_aload_0:

   244                 case bc_iload_0:

   245                 case bc_lload_0:

   246                 case bc_fload_0:

   247                 case bc_dload_0:

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

   249                     break;

   250                 case bc_aload_1:

   251                 case bc_iload_1:

   252                 case bc_lload_1:

   253                 case bc_fload_1:

   254                 case bc_dload_1:

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

   256                     break;

   257                 case bc_aload_2:

   258                 case bc_iload_2:

   259                 case bc_lload_2:

   260                 case bc_fload_2:

   261                 case bc_dload_2:

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

   263                     break;

   264                 case bc_aload_3:

   265                 case bc_iload_3:

   266                 case bc_lload_3:

   267                 case bc_fload_3:

   268                 case bc_dload_3:

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

   270                     break;

   271                 case bc_iload:

   272                 case bc_lload:

   273                 case bc_fload:

   274                 case bc_dload:

   275                 case bc_aload: {

   276                     final int indx = readByte(byteCodes, ++i);

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

   278                     break;

   279                 }

   280                 case bc_istore:

   281                 case bc_lstore:

   282                 case bc_fstore:

   283                 case bc_dstore:

   284                 case bc_astore: {

   285                     final int indx = readByte(byteCodes, ++i);

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

   287                     break;

   288                 }

   289                 case bc_astore_0:

   290                 case bc_istore_0:

   291                 case bc_lstore_0:

   292                 case bc_fstore_0:

   293                 case bc_dstore_0:

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

   295                     break;

   296                 case bc_astore_1:

   297                 case bc_istore_1:

   298                 case bc_lstore_1:

   299                 case bc_fstore_1:

   300                 case bc_dstore_1:

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

   302                     break;

   303                 case bc_astore_2:

   304                 case bc_istore_2:

   305                 case bc_lstore_2:

   306                 case bc_fstore_2:

   307                 case bc_dstore_2:

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

   309                     break;

   310                 case bc_astore_3:

   311                 case bc_istore_3:

   312                 case bc_lstore_3:

   313                 case bc_fstore_3:

   314                 case bc_dstore_3:

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

   316                     break;

   317                 case bc_iadd:

   318                 case bc_ladd:

   319                 case bc_fadd:

   320                 case bc_dadd:

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

   322                     break;

   323                 case bc_isub:

   324                 case bc_lsub:

   325                 case bc_fsub:

   326                 case bc_dsub:

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

   328                     break;

   329                 case bc_imul:

   330                 case bc_lmul:

   331                 case bc_fmul:

   332                 case bc_dmul:

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

   334                     break;

   335                 case bc_idiv:

   336                 case bc_ldiv:

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

   338                     break;

   339                 case bc_fdiv:

   340                 case bc_ddiv:

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

   342                     break;

   343                 case bc_iand:

   344                 case bc_land:

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

   346                     break;

   347                 case bc_ior:

   348                 case bc_lor:

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

   350                     break;

   351                 case bc_ixor:

   352                 case bc_lxor:

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

   354                     break;

   355                 case bc_ineg:

   356                 case bc_lneg:

   357                 case bc_fneg:

   358                 case bc_dneg:

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

   360                     break;

   361                 case bc_ishl:

   362                 case bc_lshl:

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

   364                     break;

   365                 case bc_ishr:

   366                 case bc_lshr:

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

   368                     break;

   369                 case bc_iushr:

   370                 case bc_lushr:

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

   372                     break;

   373                 case bc_iinc: {

   374                     final int varIndx = readByte(byteCodes, ++i);

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

   376                     if (incrBy == 1) {

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

   378                     } else {

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

   380                     }

   381                     break;

   382                 }

   383                 case bc_return:

   384                     out.append("return;");

   385                     break;

   386                 case bc_ireturn:

   387                 case bc_lreturn:

   388                 case bc_freturn:

   389                 case bc_dreturn:

   390                 case bc_areturn:

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

   392                     break;

   393                 case bc_i2l:

   394                 case bc_i2f:

   395                 case bc_i2d:

   396                 case bc_l2i:

   397                     // max int check?

   398                 case bc_l2f:

   399                 case bc_l2d:

   400                 case bc_f2d:

   401                 case bc_d2f:

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

   403                     break;

   404                 case bc_f2i:

   405                 case bc_f2l:

   406                 case bc_d2i:

   407                 case bc_d2l:

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

   409                     break;

   410                 case bc_i2b:

   411                 case bc_i2c:

   412                 case bc_i2s:

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

   414                     break;

   415                 case bc_aconst_null:

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

   417                     break;

   418                 case bc_iconst_m1:

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

   420                     break;

   421                 case bc_iconst_0:

   422                 case bc_dconst_0:

   423                 case bc_lconst_0:

   424                 case bc_fconst_0:

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

   426                     break;

   427                 case bc_iconst_1:

   428                 case bc_lconst_1:

   429                 case bc_fconst_1:

   430                 case bc_dconst_1:

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

   432                     break;

   433                 case bc_iconst_2:

   434                 case bc_fconst_2:

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

   436                     break;

   437                 case bc_iconst_3:

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

   439                     break;

   440                 case bc_iconst_4:

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

   442                     break;

   443                 case bc_iconst_5:

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

   445                     break;

   446                 case bc_ldc: {

   447                     int indx = readByte(byteCodes, ++i);

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

   449                     String v = encodeConstant(entry);

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

   451                     break;

   452                 }

   453                 case bc_ldc_w:

   454                 case bc_ldc2_w: {

   455                     int indx = readIntArg(byteCodes, i);

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

   457                     i += 2;

   458                     String v = encodeConstant(entry);

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

   460                     break;

   461                 }

   462                 case bc_lcmp:

   463                 case bc_fcmpl:

   464                 case bc_fcmpg:

   465                 case bc_dcmpl:

   466                 case bc_dcmpg: {

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

   468                     break;

   469                 }

   470                 case bc_if_acmpeq:

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

   472                     break;

   473                 case bc_if_acmpne:

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

   475                     break;

   476                 case bc_if_icmpeq: {

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

   478                     break;

   479                 }

   480                 case bc_ifeq: {

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

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

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

   484                     i += 2;

   485                     break;

   486                 }

   487                 case bc_ifne: {

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

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

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

   491                     i += 2;

   492                     break;

   493                 }

   494                 case bc_iflt: {

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

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

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

   498                     i += 2;

   499                     break;

   500                 }

   501                 case bc_ifle: {

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

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

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

   505                     i += 2;

   506                     break;

   507                 }

   508                 case bc_ifgt: {

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

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

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

   512                     i += 2;

   513                     break;

   514                 }

   515                 case bc_ifge: {

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

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

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

   519                     i += 2;

   520                     break;

   521                 }

   522                 case bc_ifnonnull: {

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

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

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

   526                     i += 2;

   527                     break;

   528                 }

   529                 case bc_ifnull: {

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

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

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

   533                     i += 2;

   534                     break;

   535                 }

   536                 case bc_if_icmpne:

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

   538                     break;

   539                 case bc_if_icmplt:

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

   541                     break;

   542                 case bc_if_icmple:

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

   544                     break;

   545                 case bc_if_icmpgt:

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

   547                     break;

   548                 case bc_if_icmpge:

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

   550                     break;

   551                 case bc_goto: {

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

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

   554                     i += 2;

   555                     break;

   556                 }

   557                 case bc_lookupswitch: {

   558                     int table = i / 4 * 4 + 4;

   559                     int dflt = i + readInt4(byteCodes, table);

   560                     table += 4;

   561                     int n = readInt4(byteCodes, table);

   562                     table += 4;

   563                     out.append("switch (stack.pop()) {\n");

   564                     while (n-- > 0) {

   565                         int cnstnt = readInt4(byteCodes, table);

   566                         table += 4;

   567                         int offset = i + readInt4(byteCodes, table);

   568                         table += 4;

   569                         out.append("  case " + cnstnt).append(": gt = " + offset).append("; continue;\n");

   570                     }

   571                     out.append("  default: gt = " + dflt).append("; continue;\n}");

   572                     i = table - 1;

   573                     break;

   574                 }

   575                 case bc_tableswitch: {

   576                     int table = i / 4 * 4 + 4;

   577                     int dflt = i + readInt4(byteCodes, table);

   578                     table += 4;

   579                     int low = readInt4(byteCodes, table);

   580                     table += 4;

   581                     int high = readInt4(byteCodes, table);

   582                     table += 4;

   583                     out.append("switch (stack.pop()) {\n");

   584                     while (low <= high) {

   585                         int offset = i + readInt4(byteCodes, table);

   586                         table += 4;

   587                         out.append("  case " + low).append(": gt = " + offset).append("; continue;\n");

   588                         low++;

   589                     }

   590                     out.append("  default: gt = " + dflt).append("; continue;\n}");

   591                     i = table - 1;

   592                     break;

   593                 }

   594                 case bc_invokeinterface: {

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

   596                     break;

   597                 }

   598                 case bc_invokevirtual:

   599                     i = invokeVirtualMethod(byteCodes, i);

   600                     break;

   601                 case bc_invokespecial:

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

   603                     break;

   604                 case bc_invokestatic:

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

   606                     break;

   607                 case bc_new: {

   608                     int indx = readIntArg(byteCodes, i);

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

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

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

   612                     out.append(");");

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

   614                     i += 2;

   615                     break;

   616                 }

   617                 case bc_newarray: {

   618                     int type = byteCodes[i++];

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

   620                     break;

   621                 }

   622                 case bc_anewarray: {

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

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

   625                     break;

   626                 }

   627                 case bc_multianewarray: {

   628                     i += 2;

   629                     int dim = readByte(byteCodes, ++i);

   630                     out.append("{ var a0 = new Array(stack.pop());");

   631                     for (int d = 1; d < dim; d++) {

   632                         out.append("\n  var l" + d).append(" = stack.pop();");

   633                         out.append("\n  for (var i" + d).append (" = 0; i" + d).

   634                             append(" < a" + (d - 1)).

   635                             append(".length; i" + d).append("++) {");

   636                         out.append("\n    var a" + d).

   637                             append (" = new Array(l" + d).append(");");

   638                         out.append("\n    a" + (d - 1)).append("[i" + d).append("] = a" + d).

   639                             append(";");

   640                     }

   641                     for (int d = 1; d < dim; d++) {

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

   643                     }

   644                     out.append("\nstack.push(a0); }");

   645                     break;

   646                 }

   647                 case bc_arraylength:

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

   649                     break;

   650                 case bc_iastore:

   651                 case bc_lastore:

   652                 case bc_fastore:

   653                 case bc_dastore:

   654                 case bc_aastore:

   655                 case bc_bastore:

   656                 case bc_castore:

   657                 case bc_sastore: {

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

   659                     break;

   660                 }

   661                 case bc_iaload:

   662                 case bc_laload:

   663                 case bc_faload:

   664                 case bc_daload:

   665                 case bc_aaload:

   666                 case bc_baload:

   667                 case bc_caload:

   668                 case bc_saload: {

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

   670                     break;

   671                 }

   672                 case bc_pop2:

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

   674                 case bc_pop:

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

   676                     break;

   677                 case bc_dup:

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

   679                     break;

   680                 case bc_bipush:

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

   682                     break;

   683                 case bc_sipush:

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

   685                     i += 2;

   686                     break;

   687                 case bc_getfield: {

   688                     int indx = readIntArg(byteCodes, i);

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

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

   691                     i += 2;

   692                     break;

   693                 }

   694                 case bc_getstatic: {

   695                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   700                     i += 2;

   701                     addReference(in);

   702                     break;

   703                 }

   704                 case bc_putstatic: {

   705                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   710                     i += 2;

   711                     addReference(in);

   712                     break;

   713                 }

   714                 case bc_putfield: {

   715                     int indx = readIntArg(byteCodes, i);

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

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

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

   719                     i += 2;

   720                     break;

   721                 }

   722                 case bc_checkcast: {

   723                     int indx = readIntArg(byteCodes, i);

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

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

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

   727                         // no way to check arrays right now

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

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

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

   731                     }

   732                     i += 2;

   733                     break;

   734                 }

   735                 case bc_instanceof: {

   736                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   741                     i += 2;

   742                     break;

   743                 }

   744                 case bc_athrow: {

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

   746                     break;

   747                 }

   748                 default: {

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

   750                 }

   752             }

   753             out.append(" //");

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

   755                 out.append(" ");

   756                 final int cc = readByte(byteCodes, j);

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

   758             }

   759             out.append("\n");

   760         }

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

   762     }

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

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

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

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

   768         return i + 2;

   769     }

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

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

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

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

   775     }

   776     private int readInt4(byte[] byteCodes, int offsetInstruction) {

   777         final int d = byteCodes[offsetInstruction + 0] << 24;

   778         final int c = byteCodes[offsetInstruction + 1] << 16;

   779         final int b = byteCodes[offsetInstruction + 2] << 8;

   780         final int a = byteCodes[offsetInstruction + 3];

   781         return (d & 0xff000000) | (c & 0xff0000) | (b & 0xff00) | (a & 0xff);

   782     }

   783     private int readByte(byte[] byteCodes, int offsetInstruction) {

   784         return (byteCodes[offsetInstruction] + 256) % 256;

   785     }

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

   788         int cnt = 0;

   789         int i = 0;

   790         Boolean count = null;

   791         boolean array = false;

   792         int firstPos = sig.length();

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

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

   795             switch (ch) {

   796                 case '(':

   797                     count = true;

   798                     continue;

   799                 case ')':

   800                     count = false;

   801                     continue;

   802                 case 'A':

   803                     array = true;

   804                     break;

   805                 case 'B':

   806                 case 'C':

   807                 case 'D':

   808                 case 'F':

   809                 case 'I':

   810                 case 'J':

   811                 case 'S':

   812                 case 'Z':

   813                     if (count) {

   814                         cnt++;

   815                         if (array) {

   816                             sig.append('A');

   817                         }

   818                         sig.append(ch);

   819                     } else {

   820                         hasReturnType[0] = true;

   821                         sig.insert(firstPos, ch);

   822                         if (array) {

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

   824                         }

   825                     }

   826                     array = false;

   827                     continue;

   828                 case 'V':

   829                     assert !count;

   830                     hasReturnType[0] = false;

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

   832                     continue;

   833                 case 'L':

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

   835                     if (count) {

   836                         cnt++;

   837                         if (array) {

   838                             sig.append('A');

   839                         }

   840                         sig.append(ch);

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

   842                     } else {

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

   844                         sig.insert(firstPos, ch);

   845                         if (array) {

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

   847                         }

   848                         hasReturnType[0] = true;

   849                     }

   850                     i = next + 1;

   851                     continue;

   852                 case '[':

   853                     //arrays++;

   854                     continue;

   855                 default:

   856                     break; // invalid character

   857             }

   858         }

   859         return cnt;

   860     }

   862     private void generateStaticField(Variable v) throws IOException {

   863         out.append("\nvar ")

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

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

   866     }

   868     private String findMethodName(Method m) {

   869         StringBuilder name = new StringBuilder();

   870         String descr = m.getDescriptor();

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

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

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

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

   875         } else {

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

   877         }

   879         boolean hasReturn[] = { false };

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

   881         return name.toString();

   882     }

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

   885         StringBuilder name = new StringBuilder();

   886         String descr = mi.getDescriptor();

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

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

   889         } else {

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

   891         }

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

   893         return name.toString();

   894     }

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

   897     throws IOException {

   898         int methodIndex = readIntArg(byteCodes, i);

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

   900         boolean[] hasReturn = { false };

   901         int[] cnt = { 0 };

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

   903         out.append("{ ");

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

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

   906         }

   908         if (hasReturn[0]) {

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

   910         }

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

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

   913         if (isStatic) {

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

   915         } else {

   916             out.append('_');

   917         }

   918         out.append(mn);

   919         out.append('(');

   920         String sep = "";

   921         if (!isStatic) {

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

   923             sep = ", ";

   924         }

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

   926             out.append(sep);

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

   928             sep = ", ";

   929         }

   930         out.append(")");

   931         if (hasReturn[0]) {

   932             out.append(")");

   933         }

   934         out.append("; }");

   935         i += 2;

   936         addReference(in);

   937         return i;

   938     }

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

   940     throws IOException {

   941         int methodIndex = readIntArg(byteCodes, i);

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

   943         boolean[] hasReturn = { false };

   944         int[] cnt = { 0 };

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

   946         out.append("{ ");

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

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

   949         }

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

   951         if (hasReturn[0]) {

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

   953         }

   954         out.append("self.");

   955         out.append(mn);

   956         out.append('(');

   957         out.append("self");

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

   959             out.append(", ");

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

   961         }

   962         out.append(")");

   963         if (hasReturn[0]) {

   964             out.append(")");

   965         }

   966         out.append("; }");

   967         i += 2;

   968         return i;

   969     }

   971     private void addReference(String cn) throws IOException {

   972         if (references != null) {

   973             if (references.add(cn)) {

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

   975             }

   976         }

   977     }

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

   980         int arr = 0;

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

   982             out.append('A');

   983             d = d.substring(1);

   984         }

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

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

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

   988         } else {

   989             out.append(d);

   990         }

   991     }

   993     private String encodeConstant(CPEntry entry) {

   994         final String v;

   995         if (entry instanceof CPClassInfo) {

   996             v = "new java_lang_Class";

   997         } else if (entry instanceof CPStringInfo) {

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

   999         } else {

  1000             v = entry.getValue().toString();

  1001         }

  1002         return v;

  1003     }

  1005     private String findDescriptor(String d) {

  1006         return d.replace('[', 'A');

  1007     }

  1009     private boolean javaScriptBody(Method m, boolean isStatic) throws IOException {

  1010         final ClassName extraAnn = ClassName.getClassName(JavaScriptBody.class.getName().replace('.', '/'));

  1011         Annotation a = m.getAnnotation(extraAnn);

  1012         if (a != null) {

  1013             final ElementValue annVal = a.getComponent("body").getValue();

  1014             String body = ((PrimitiveElementValue) annVal).getValue().getValue().toString();

  1016             final ArrayElementValue arrVal = (ArrayElementValue) a.getComponent("args").getValue();

  1017             final int len = arrVal.getValues().length;

  1018             String[] names = new String[len];

  1019             for (int i = 0; i < len; i++) {

  1020                 names[i] = ((PrimitiveElementValue) arrVal.getValues()[i]).getValue().getValue().toString();

  1021             }

  1022             out.append("\nfunction ").append(

  1023                 jc.getName().getInternalName().replace('/', '_')).append('_').append(findMethodName(m));

  1024             out.append("(");

  1025             String space;

  1026             int index;

  1027             if (!isStatic) {

  1028                 out.append(names[0]);

  1029                 space = ",";

  1030                 index = 1;

  1031             } else {

  1032                 space = "";

  1033                 index = 0;

  1034             }

  1035             List<Parameter> args = m.getParameters();

  1036             for (int i = 0; i < args.size(); i++) {

  1037                 out.append(space);

  1038                 out.append(names[index]);

  1039                 final String desc = findDescriptor(args.get(i).getDescriptor());

  1040                 index++;

  1041                 space = ",";

  1042             }

  1043             out.append(") {").append("\n");

  1044             out.append(body);

  1045             out.append("\n}\n");

  1046             return true;

  1047         }

  1048         return false;

  1049     }

  1050 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Wed, 31 Oct 2012 18:05:24 +0100
changeset 135	a206e280acc8
parent 130	0b7c9b5b8079
child 137	45184b2f9697
permissions	-rw-r--r--