hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@45184b2f9697

     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.fld_").

   119                     append(v.getName()).append(" = 0;");

   120             }

   121         }

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

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

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

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

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

   127         ClassName sc = jc.getSuperClass();

   128         if (sc != null) {

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

   130                .append(".prototype = ").

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

   132         } else {

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

   134         }

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

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

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

   138             }

   139         }

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

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

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

   143         }

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

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

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

   147         StringBuilder sb = new StringBuilder();

   148         for (String init : toInitilize) {

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

   150         }

   151         return sb.toString();

   152     }

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

   154         if (javaScriptBody(m, true)) {

   155             return;

   156         }

   157         final String mn = findMethodName(m);

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

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

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

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

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

   163         }

   164         out.append('(');

   165         String space = "";

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

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

   168             out.append(space);

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

   170             space = ",";

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

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

   173                 index += 2;

   174             } else {

   175                 index++;

   176             }

   177         }

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

   179         final Code code = m.getCode();

   180         if (code != null) {

   181             int len = code.getMaxLocals();

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

   183                 out.append("  var ");

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

   185             }

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

   187             produceCode(code.getByteCodes());

   188         } else {

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

   190         }

   191         out.append("}");

   192     }

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

   195         final String name = findMethodName(m);

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

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

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

   199     }

   201     private void generateInstanceMethod(Method m) throws IOException {

   202         if (javaScriptBody(m, false)) {

   203             return;

   204         }

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

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

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

   208         out.append("(arg0");

   209         String space = ",";

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

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

   212             out.append(space);

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

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

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

   216                 index += 2;

   217             } else {

   218                 index++;

   219             }

   220         }

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

   222         final Code code = m.getCode();

   223         if (code != null) {

   224             int len = code.getMaxLocals();

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

   226                 out.append("  var ");

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

   228             }

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

   230             produceCode(code.getByteCodes());

   231         } else {

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

   233         }

   234         out.append("}");

   235     }

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

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

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

   240             int prev = i;

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

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

   243             switch (c) {

   244                 case bc_aload_0:

   245                 case bc_iload_0:

   246                 case bc_lload_0:

   247                 case bc_fload_0:

   248                 case bc_dload_0:

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

   250                     break;

   251                 case bc_aload_1:

   252                 case bc_iload_1:

   253                 case bc_lload_1:

   254                 case bc_fload_1:

   255                 case bc_dload_1:

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

   257                     break;

   258                 case bc_aload_2:

   259                 case bc_iload_2:

   260                 case bc_lload_2:

   261                 case bc_fload_2:

   262                 case bc_dload_2:

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

   264                     break;

   265                 case bc_aload_3:

   266                 case bc_iload_3:

   267                 case bc_lload_3:

   268                 case bc_fload_3:

   269                 case bc_dload_3:

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

   271                     break;

   272                 case bc_iload:

   273                 case bc_lload:

   274                 case bc_fload:

   275                 case bc_dload:

   276                 case bc_aload: {

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

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

   279                     break;

   280                 }

   281                 case bc_istore:

   282                 case bc_lstore:

   283                 case bc_fstore:

   284                 case bc_dstore:

   285                 case bc_astore: {

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

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

   288                     break;

   289                 }

   290                 case bc_astore_0:

   291                 case bc_istore_0:

   292                 case bc_lstore_0:

   293                 case bc_fstore_0:

   294                 case bc_dstore_0:

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

   296                     break;

   297                 case bc_astore_1:

   298                 case bc_istore_1:

   299                 case bc_lstore_1:

   300                 case bc_fstore_1:

   301                 case bc_dstore_1:

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

   303                     break;

   304                 case bc_astore_2:

   305                 case bc_istore_2:

   306                 case bc_lstore_2:

   307                 case bc_fstore_2:

   308                 case bc_dstore_2:

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

   310                     break;

   311                 case bc_astore_3:

   312                 case bc_istore_3:

   313                 case bc_lstore_3:

   314                 case bc_fstore_3:

   315                 case bc_dstore_3:

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

   317                     break;

   318                 case bc_iadd:

   319                 case bc_ladd:

   320                 case bc_fadd:

   321                 case bc_dadd:

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

   323                     break;

   324                 case bc_isub:

   325                 case bc_lsub:

   326                 case bc_fsub:

   327                 case bc_dsub:

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

   329                     break;

   330                 case bc_imul:

   331                 case bc_lmul:

   332                 case bc_fmul:

   333                 case bc_dmul:

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

   335                     break;

   336                 case bc_idiv:

   337                 case bc_ldiv:

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

   339                     break;

   340                 case bc_fdiv:

   341                 case bc_ddiv:

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

   343                     break;

   344                 case bc_iand:

   345                 case bc_land:

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

   347                     break;

   348                 case bc_ior:

   349                 case bc_lor:

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

   351                     break;

   352                 case bc_ixor:

   353                 case bc_lxor:

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

   355                     break;

   356                 case bc_ineg:

   357                 case bc_lneg:

   358                 case bc_fneg:

   359                 case bc_dneg:

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

   361                     break;

   362                 case bc_ishl:

   363                 case bc_lshl:

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

   365                     break;

   366                 case bc_ishr:

   367                 case bc_lshr:

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

   369                     break;

   370                 case bc_iushr:

   371                 case bc_lushr:

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

   373                     break;

   374                 case bc_iinc: {

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

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

   377                     if (incrBy == 1) {

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

   379                     } else {

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

   381                     }

   382                     break;

   383                 }

   384                 case bc_return:

   385                     out.append("return;");

   386                     break;

   387                 case bc_ireturn:

   388                 case bc_lreturn:

   389                 case bc_freturn:

   390                 case bc_dreturn:

   391                 case bc_areturn:

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

   393                     break;

   394                 case bc_i2l:

   395                 case bc_i2f:

   396                 case bc_i2d:

   397                 case bc_l2i:

   398                     // max int check?

   399                 case bc_l2f:

   400                 case bc_l2d:

   401                 case bc_f2d:

   402                 case bc_d2f:

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

   404                     break;

   405                 case bc_f2i:

   406                 case bc_f2l:

   407                 case bc_d2i:

   408                 case bc_d2l:

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

   410                     break;

   411                 case bc_i2b:

   412                 case bc_i2c:

   413                 case bc_i2s:

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

   415                     break;

   416                 case bc_aconst_null:

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

   418                     break;

   419                 case bc_iconst_m1:

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

   421                     break;

   422                 case bc_iconst_0:

   423                 case bc_dconst_0:

   424                 case bc_lconst_0:

   425                 case bc_fconst_0:

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

   427                     break;

   428                 case bc_iconst_1:

   429                 case bc_lconst_1:

   430                 case bc_fconst_1:

   431                 case bc_dconst_1:

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

   433                     break;

   434                 case bc_iconst_2:

   435                 case bc_fconst_2:

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

   437                     break;

   438                 case bc_iconst_3:

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

   440                     break;

   441                 case bc_iconst_4:

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

   443                     break;

   444                 case bc_iconst_5:

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

   446                     break;

   447                 case bc_ldc: {

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

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

   450                     String v = encodeConstant(entry);

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

   452                     break;

   453                 }

   454                 case bc_ldc_w:

   455                 case bc_ldc2_w: {

   456                     int indx = readIntArg(byteCodes, i);

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

   458                     i += 2;

   459                     String v = encodeConstant(entry);

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

   461                     break;

   462                 }

   463                 case bc_lcmp:

   464                 case bc_fcmpl:

   465                 case bc_fcmpg:

   466                 case bc_dcmpl:

   467                 case bc_dcmpg: {

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

   469                     break;

   470                 }

   471                 case bc_if_acmpeq:

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

   473                     break;

   474                 case bc_if_acmpne:

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

   476                     break;

   477                 case bc_if_icmpeq: {

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

   479                     break;

   480                 }

   481                 case bc_ifeq: {

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

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

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

   485                     i += 2;

   486                     break;

   487                 }

   488                 case bc_ifne: {

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

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

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

   492                     i += 2;

   493                     break;

   494                 }

   495                 case bc_iflt: {

   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_ifle: {

   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_ifgt: {

   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_ifge: {

   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_ifnonnull: {

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

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

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

   527                     i += 2;

   528                     break;

   529                 }

   530                 case bc_ifnull: {

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

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

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

   534                     i += 2;

   535                     break;

   536                 }

   537                 case bc_if_icmpne:

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

   539                     break;

   540                 case bc_if_icmplt:

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

   542                     break;

   543                 case bc_if_icmple:

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

   545                     break;

   546                 case bc_if_icmpgt:

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

   548                     break;

   549                 case bc_if_icmpge:

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

   551                     break;

   552                 case bc_goto: {

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

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

   555                     i += 2;

   556                     break;

   557                 }

   558                 case bc_lookupswitch: {

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

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

   561                     table += 4;

   562                     int n = readInt4(byteCodes, table);

   563                     table += 4;

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

   565                     while (n-- > 0) {

   566                         int cnstnt = readInt4(byteCodes, table);

   567                         table += 4;

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

   569                         table += 4;

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

   571                     }

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

   573                     i = table - 1;

   574                     break;

   575                 }

   576                 case bc_tableswitch: {

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

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

   579                     table += 4;

   580                     int low = readInt4(byteCodes, table);

   581                     table += 4;

   582                     int high = readInt4(byteCodes, table);

   583                     table += 4;

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

   585                     while (low <= high) {

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

   587                         table += 4;

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

   589                         low++;

   590                     }

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

   592                     i = table - 1;

   593                     break;

   594                 }

   595                 case bc_invokeinterface: {

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

   597                     break;

   598                 }

   599                 case bc_invokevirtual:

   600                     i = invokeVirtualMethod(byteCodes, i);

   601                     break;

   602                 case bc_invokespecial:

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

   604                     break;

   605                 case bc_invokestatic:

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

   607                     break;

   608                 case bc_new: {

   609                     int indx = readIntArg(byteCodes, i);

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

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

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

   613                     out.append(");");

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

   615                     i += 2;

   616                     break;

   617                 }

   618                 case bc_newarray: {

   619                     int type = byteCodes[i++];

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

   621                     break;

   622                 }

   623                 case bc_anewarray: {

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

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

   626                     break;

   627                 }

   628                 case bc_multianewarray: {

   629                     i += 2;

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

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

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

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

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

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

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

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

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

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

   640                             append(";");

   641                     }

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

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

   644                     }

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

   646                     break;

   647                 }

   648                 case bc_arraylength:

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

   650                     break;

   651                 case bc_iastore:

   652                 case bc_lastore:

   653                 case bc_fastore:

   654                 case bc_dastore:

   655                 case bc_aastore:

   656                 case bc_bastore:

   657                 case bc_castore:

   658                 case bc_sastore: {

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

   660                     break;

   661                 }

   662                 case bc_iaload:

   663                 case bc_laload:

   664                 case bc_faload:

   665                 case bc_daload:

   666                 case bc_aaload:

   667                 case bc_baload:

   668                 case bc_caload:

   669                 case bc_saload: {

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

   671                     break;

   672                 }

   673                 case bc_pop2:

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

   675                 case bc_pop:

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

   677                     break;

   678                 case bc_dup:

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

   680                     break;

   681                 case bc_bipush:

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

   683                     break;

   684                 case bc_sipush:

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

   686                     i += 2;

   687                     break;

   688                 case bc_getfield: {

   689                     int indx = readIntArg(byteCodes, i);

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

   691                     out.append("stack.push(stack.pop().fld_").

   692                         append(fi.getFieldName()).append(");");

   693                     i += 2;

   694                     break;

   695                 }

   696                 case bc_getstatic: {

   697                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   702                     i += 2;

   703                     addReference(in);

   704                     break;

   705                 }

   706                 case bc_putstatic: {

   707                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   712                     i += 2;

   713                     addReference(in);

   714                     break;

   715                 }

   716                 case bc_putfield: {

   717                     int indx = readIntArg(byteCodes, i);

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

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

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

   721                     i += 2;

   722                     break;

   723                 }

   724                 case bc_checkcast: {

   725                     int indx = readIntArg(byteCodes, i);

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

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

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

   729                         // no way to check arrays right now

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

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

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

   733                     }

   734                     i += 2;

   735                     break;

   736                 }

   737                 case bc_instanceof: {

   738                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   743                     i += 2;

   744                     break;

   745                 }

   746                 case bc_athrow: {

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

   748                     break;

   749                 }

   750                 default: {

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

   752                 }

   754             }

   755             out.append(" //");

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

   757                 out.append(" ");

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

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

   760             }

   761             out.append("\n");

   762         }

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

   764     }

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

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

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

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

   770         return i + 2;

   771     }

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

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

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

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

   777     }

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

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

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

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

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

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

   784     }

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

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

   787     }

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

   790         int cnt = 0;

   791         int i = 0;

   792         Boolean count = null;

   793         boolean array = false;

   794         int firstPos = sig.length();

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

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

   797             switch (ch) {

   798                 case '(':

   799                     count = true;

   800                     continue;

   801                 case ')':

   802                     count = false;

   803                     continue;

   804                 case 'A':

   805                     array = true;

   806                     break;

   807                 case 'B':

   808                 case 'C':

   809                 case 'D':

   810                 case 'F':

   811                 case 'I':

   812                 case 'J':

   813                 case 'S':

   814                 case 'Z':

   815                     if (count) {

   816                         cnt++;

   817                         if (array) {

   818                             sig.append('A');

   819                         }

   820                         sig.append(ch);

   821                     } else {

   822                         hasReturnType[0] = true;

   823                         sig.insert(firstPos, ch);

   824                         if (array) {

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

   826                         }

   827                     }

   828                     array = false;

   829                     continue;

   830                 case 'V':

   831                     assert !count;

   832                     hasReturnType[0] = false;

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

   834                     continue;

   835                 case 'L':

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

   837                     if (count) {

   838                         cnt++;

   839                         if (array) {

   840                             sig.append('A');

   841                         }

   842                         sig.append(ch);

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

   844                     } else {

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

   846                         sig.insert(firstPos, ch);

   847                         if (array) {

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

   849                         }

   850                         hasReturnType[0] = true;

   851                     }

   852                     i = next + 1;

   853                     continue;

   854                 case '[':

   855                     //arrays++;

   856                     continue;

   857                 default:

   858                     break; // invalid character

   859             }

   860         }

   861         return cnt;

   862     }

   864     private void generateStaticField(Variable v) throws IOException {

   865         out.append("\nvar ")

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

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

   868     }

   870     private String findMethodName(Method m) {

   871         StringBuilder name = new StringBuilder();

   872         String descr = m.getDescriptor();

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

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

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

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

   877         } else {

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

   879         }

   881         boolean hasReturn[] = { false };

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

   883         return name.toString();

   884     }

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

   887         StringBuilder name = new StringBuilder();

   888         String descr = mi.getDescriptor();

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

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

   891         } else {

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

   893         }

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

   895         return name.toString();

   896     }

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

   899     throws IOException {

   900         int methodIndex = readIntArg(byteCodes, i);

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

   902         boolean[] hasReturn = { false };

   903         int[] cnt = { 0 };

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

   905         out.append("{ ");

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

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

   908         }

   910         if (hasReturn[0]) {

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

   912         }

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

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

   915         if (isStatic) {

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

   917         } else {

   918             out.append('_');

   919         }

   920         out.append(mn);

   921         out.append('(');

   922         String sep = "";

   923         if (!isStatic) {

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

   925             sep = ", ";

   926         }

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

   928             out.append(sep);

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

   930             sep = ", ";

   931         }

   932         out.append(")");

   933         if (hasReturn[0]) {

   934             out.append(")");

   935         }

   936         out.append("; }");

   937         i += 2;

   938         addReference(in);

   939         return i;

   940     }

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

   942     throws IOException {

   943         int methodIndex = readIntArg(byteCodes, i);

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

   945         boolean[] hasReturn = { false };

   946         int[] cnt = { 0 };

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

   948         out.append("{ ");

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

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

   951         }

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

   953         if (hasReturn[0]) {

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

   955         }

   956         out.append("self.");

   957         out.append(mn);

   958         out.append('(');

   959         out.append("self");

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

   961             out.append(", ");

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

   963         }

   964         out.append(")");

   965         if (hasReturn[0]) {

   966             out.append(")");

   967         }

   968         out.append("; }");

   969         i += 2;

   970         return i;

   971     }

   973     private void addReference(String cn) throws IOException {

   974         if (references != null) {

   975             if (references.add(cn)) {

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

   977             }

   978         }

   979     }

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

   982         int arr = 0;

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

   984             out.append('A');

   985             d = d.substring(1);

   986         }

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

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

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

   990         } else {

   991             out.append(d);

   992         }

   993     }

   995     private String encodeConstant(CPEntry entry) {

   996         final String v;

   997         if (entry instanceof CPClassInfo) {

   998             v = "new java_lang_Class";

   999         } else if (entry instanceof CPStringInfo) {

  1000             v = "\"" + entry.getValue().toString().

  1001                 replace("\\", "\\\\").

  1002                 replace("\n", "\\n").

  1003                 replace("\r", "\\r").

  1004                 replace("\t", "\\t").

  1005                 replace("\"", "\\\"")

  1006                 + "\"";

  1007         } else {

  1008             v = entry.getValue().toString();

  1009         }

  1010         return v;

  1011     }

  1013     private String findDescriptor(String d) {

  1014         return d.replace('[', 'A');

  1015     }

  1017     private boolean javaScriptBody(Method m, boolean isStatic) throws IOException {

  1018         final ClassName extraAnn = ClassName.getClassName(JavaScriptBody.class.getName().replace('.', '/'));

  1019         Annotation a = m.getAnnotation(extraAnn);

  1020         if (a != null) {

  1021             final ElementValue annVal = a.getComponent("body").getValue();

  1022             String body = ((PrimitiveElementValue) annVal).getValue().getValue().toString();

  1024             final ArrayElementValue arrVal = (ArrayElementValue) a.getComponent("args").getValue();

  1025             final int len = arrVal.getValues().length;

  1026             String[] names = new String[len];

  1027             for (int i = 0; i < len; i++) {

  1028                 names[i] = ((PrimitiveElementValue) arrVal.getValues()[i]).getValue().getValue().toString();

  1029             }

  1030             out.append("\nfunction ").append(

  1031                 jc.getName().getInternalName().replace('/', '_')).append('_').append(findMethodName(m));

  1032             out.append("(");

  1033             String space;

  1034             int index;

  1035             if (!isStatic) {

  1036                 out.append(names[0]);

  1037                 space = ",";

  1038                 index = 1;

  1039             } else {

  1040                 space = "";

  1041                 index = 0;

  1042             }

  1043             List<Parameter> args = m.getParameters();

  1044             for (int i = 0; i < args.size(); i++) {

  1045                 out.append(space);

  1046                 out.append(names[index]);

  1047                 final String desc = findDescriptor(args.get(i).getDescriptor());

  1048                 index++;

  1049                 space = ",";

  1050             }

  1051             out.append(") {").append("\n");

  1052             out.append(body);

  1053             out.append("\n}\n");

  1054             return true;

  1055         }

  1056         return false;

  1057     }

  1058 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Thu, 08 Nov 2012 18:34:12 +0100
changeset 137	45184b2f9697
parent 135	a206e280acc8
child 151	40f95fe90cdc
permissions	-rw-r--r--