hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@3d5597011af0

     1 /**

     2  * Back 2 Browser Bytecode Translator

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

     4  *

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

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

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

     8  *

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

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

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

    12  * GNU General Public License for more details.

    13  *

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

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

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

    17  */

    18 /*

    19 Java 4 Browser Bytecode Translator

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

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

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

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

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

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

    28 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    29 GNU General Public License for more details.

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

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

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

    34 */

    35 package org.apidesign.vm4brwsr;

    37 import java.io.IOException;

    38 import java.io.InputStream;

    39 import java.util.ArrayList;

    40 import java.util.Collection;

    41 import java.util.List;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    63  *

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

    65  */

    66 public final class ByteCodeToJavaScript {

    67     private final ClassFile jc;

    68     private final Appendable out;

    69     private final Collection<? super String> references;

    71     private ByteCodeToJavaScript(

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

    73     ) {

    74         this.jc = jc;

    75         this.out = out;

    76         this.references = references;

    77     }

    79     /**

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

    81      *

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

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

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

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

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

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

    88      *   if one is not interested in knowing references

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

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

    91      *

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

    93      */

    95     public static String compile(

    96         InputStream classFile, Appendable out,

    97         Collection<? super String> references,

    98         Collection<? super String> scripts

    99     ) throws IOException {

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

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

   102         Annotation a = jc.getAnnotation(extraAnn);

   103         if (a != null) {

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

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

   106             scripts.add(res);

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

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

   109                 return null;

   110             }

   111         }

   113         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

   114             jc, out, references

   115         );

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

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

   118             if (m.isStatic()) {

   119                 compiler.generateStaticMethod(m, toInitilize);

   120             } else {

   121                 compiler.generateInstanceMethod(m);

   122             }

   123         }

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

   125             if (v.isStatic()) {

   126                 compiler.generateStaticField(v);

   127             }

   128         }

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

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

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

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

   134             if (!v.isStatic()) {

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

   136             }

   137         }

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

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

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

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

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

   143         ClassName sc = jc.getSuperClass();

   144         if (sc != null) {

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

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

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

   148         }

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

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

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

   152             }

   153         }

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

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

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

   157         }

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

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

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

   161         StringBuilder sb = new StringBuilder();

   162         for (String init : toInitilize) {

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

   164         }

   165         return sb.toString();

   166     }

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

   168         if (javaScriptBody(m, true)) {

   169             return;

   170         }

   171         final String mn = findMethodName(m);

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

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

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

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

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

   177         }

   178         out.append('(');

   179         String space = "";

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

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

   182             out.append(space);

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

   184             space = ",";

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

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

   187                 index += 2;

   188             } else {

   189                 index++;

   190             }

   191         }

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

   193         final Code code = m.getCode();

   194         if (code != null) {

   195             int len = code.getMaxLocals();

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

   197                 out.append("  var ");

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

   199             }

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

   201             produceCode(code.getByteCodes());

   202         } else {

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

   204         }

   205         out.append("}");

   206     }

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

   209         final String name = findMethodName(m);

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

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

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

   213     }

   215     private void generateInstanceMethod(Method m) throws IOException {

   216         if (javaScriptBody(m, false)) {

   217             return;

   218         }

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

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

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

   222         out.append("(arg0");

   223         String space = ",";

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

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

   226             out.append(space);

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

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

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

   230                 index += 2;

   231             } else {

   232                 index++;

   233             }

   234         }

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

   236         final Code code = m.getCode();

   237         if (code != null) {

   238             int len = code.getMaxLocals();

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

   240                 out.append("  var ");

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

   242             }

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

   244             produceCode(code.getByteCodes());

   245         } else {

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

   247         }

   248         out.append("}");

   249     }

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

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

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

   254             int prev = i;

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

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

   257             switch (c) {

   258                 case bc_aload_0:

   259                 case bc_iload_0:

   260                 case bc_lload_0:

   261                 case bc_fload_0:

   262                 case bc_dload_0:

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

   264                     break;

   265                 case bc_aload_1:

   266                 case bc_iload_1:

   267                 case bc_lload_1:

   268                 case bc_fload_1:

   269                 case bc_dload_1:

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

   271                     break;

   272                 case bc_aload_2:

   273                 case bc_iload_2:

   274                 case bc_lload_2:

   275                 case bc_fload_2:

   276                 case bc_dload_2:

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

   278                     break;

   279                 case bc_aload_3:

   280                 case bc_iload_3:

   281                 case bc_lload_3:

   282                 case bc_fload_3:

   283                 case bc_dload_3:

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

   285                     break;

   286                 case bc_iload:

   287                 case bc_lload:

   288                 case bc_fload:

   289                 case bc_dload:

   290                 case bc_aload: {

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

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

   293                     break;

   294                 }

   295                 case bc_istore:

   296                 case bc_lstore:

   297                 case bc_fstore:

   298                 case bc_dstore:

   299                 case bc_astore: {

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

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

   302                     break;

   303                 }

   304                 case bc_astore_0:

   305                 case bc_istore_0:

   306                 case bc_lstore_0:

   307                 case bc_fstore_0:

   308                 case bc_dstore_0:

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

   310                     break;

   311                 case bc_astore_1:

   312                 case bc_istore_1:

   313                 case bc_lstore_1:

   314                 case bc_fstore_1:

   315                 case bc_dstore_1:

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

   317                     break;

   318                 case bc_astore_2:

   319                 case bc_istore_2:

   320                 case bc_lstore_2:

   321                 case bc_fstore_2:

   322                 case bc_dstore_2:

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

   324                     break;

   325                 case bc_astore_3:

   326                 case bc_istore_3:

   327                 case bc_lstore_3:

   328                 case bc_fstore_3:

   329                 case bc_dstore_3:

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

   331                     break;

   332                 case bc_iadd:

   333                 case bc_ladd:

   334                 case bc_fadd:

   335                 case bc_dadd:

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

   337                     break;

   338                 case bc_isub:

   339                 case bc_lsub:

   340                 case bc_fsub:

   341                 case bc_dsub:

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

   343                     break;

   344                 case bc_imul:

   345                 case bc_lmul:

   346                 case bc_fmul:

   347                 case bc_dmul:

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

   349                     break;

   350                 case bc_idiv:

   351                 case bc_ldiv:

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

   353                     break;

   354                 case bc_fdiv:

   355                 case bc_ddiv:

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

   357                     break;

   358                 case bc_iand:

   359                 case bc_land:

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

   361                     break;

   362                 case bc_ior:

   363                 case bc_lor:

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

   365                     break;

   366                 case bc_ixor:

   367                 case bc_lxor:

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

   369                     break;

   370                 case bc_ineg:

   371                 case bc_lneg:

   372                 case bc_fneg:

   373                 case bc_dneg:

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

   375                     break;

   376                 case bc_ishl:

   377                 case bc_lshl:

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

   379                     break;

   380                 case bc_ishr:

   381                 case bc_lshr:

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

   383                     break;

   384                 case bc_iushr:

   385                 case bc_lushr:

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

   387                     break;

   388                 case bc_iinc: {

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

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

   391                     if (incrBy == 1) {

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

   393                     } else {

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

   395                     }

   396                     break;

   397                 }

   398                 case bc_return:

   399                     out.append("return;");

   400                     break;

   401                 case bc_ireturn:

   402                 case bc_lreturn:

   403                 case bc_freturn:

   404                 case bc_dreturn:

   405                 case bc_areturn:

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

   407                     break;

   408                 case bc_i2l:

   409                 case bc_i2f:

   410                 case bc_i2d:

   411                 case bc_l2i:

   412                     // max int check?

   413                 case bc_l2f:

   414                 case bc_l2d:

   415                 case bc_f2d:

   416                 case bc_d2f:

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

   418                     break;

   419                 case bc_f2i:

   420                 case bc_f2l:

   421                 case bc_d2i:

   422                 case bc_d2l:

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

   424                     break;

   425                 case bc_i2b:

   426                 case bc_i2c:

   427                 case bc_i2s:

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

   429                     break;

   430                 case bc_aconst_null:

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

   432                     break;

   433                 case bc_iconst_m1:

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

   435                     break;

   436                 case bc_iconst_0:

   437                 case bc_dconst_0:

   438                 case bc_lconst_0:

   439                 case bc_fconst_0:

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

   441                     break;

   442                 case bc_iconst_1:

   443                 case bc_lconst_1:

   444                 case bc_fconst_1:

   445                 case bc_dconst_1:

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

   447                     break;

   448                 case bc_iconst_2:

   449                 case bc_fconst_2:

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

   451                     break;

   452                 case bc_iconst_3:

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

   454                     break;

   455                 case bc_iconst_4:

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

   457                     break;

   458                 case bc_iconst_5:

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

   460                     break;

   461                 case bc_ldc: {

   462                     int indx = byteCodes[++i];

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

   464                     String v = encodeConstant(entry);

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

   466                     break;

   467                 }

   468                 case bc_ldc_w:

   469                 case bc_ldc2_w: {

   470                     int indx = readIntArg(byteCodes, i);

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

   472                     i += 2;

   473                     String v = encodeConstant(entry);

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

   475                     break;

   476                 }

   477                 case bc_lcmp:

   478                 case bc_fcmpl:

   479                 case bc_fcmpg:

   480                 case bc_dcmpl:

   481                 case bc_dcmpg: {

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

   483                     break;

   484                 }

   485                 case bc_if_acmpeq:

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

   487                     break;

   488                 case bc_if_acmpne:

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

   490                     break;

   491                 case bc_if_icmpeq: {

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

   493                     break;

   494                 }

   495                 case bc_ifeq: {

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

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

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

   499                     i += 2;

   500                     break;

   501                 }

   502                 case bc_ifne: {

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

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

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

   506                     i += 2;

   507                     break;

   508                 }

   509                 case bc_iflt: {

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

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

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

   513                     i += 2;

   514                     break;

   515                 }

   516                 case bc_ifle: {

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

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

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

   520                     i += 2;

   521                     break;

   522                 }

   523                 case bc_ifgt: {

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

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

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

   527                     i += 2;

   528                     break;

   529                 }

   530                 case bc_ifge: {

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

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

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

   534                     i += 2;

   535                     break;

   536                 }

   537                 case bc_ifnonnull: {

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

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

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

   541                     i += 2;

   542                     break;

   543                 }

   544                 case bc_ifnull: {

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

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

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

   548                     i += 2;

   549                     break;

   550                 }

   551                 case bc_if_icmpne:

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

   553                     break;

   554                 case bc_if_icmplt:

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

   556                     break;

   557                 case bc_if_icmple:

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

   559                     break;

   560                 case bc_if_icmpgt:

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

   562                     break;

   563                 case bc_if_icmpge:

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

   565                     break;

   566                 case bc_goto: {

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

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

   569                     i += 2;

   570                     break;

   571                 }

   572                 case bc_lookupswitch: {

   573                     int table = (i - 1) / 4 * 4 + 4;

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

   575                     table += 4;

   576                     int n = readInt4(byteCodes, table);

   577                     table += 4;

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

   579                     while (n-- > 0) {

   580                         int cnstnt = readInt4(byteCodes, table);

   581                         table += 4;

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

   583                         table += 4;

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

   585                     }

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

   587                     i = table - 1;

   588                     break;

   589                 }

   590                 case bc_tableswitch: {

   591                     int table = (i - 1) / 4 * 4 + 4;

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

   593                     table += 4;

   594                     int low = readInt4(byteCodes, table);

   595                     table += 4;

   596                     int high = readInt4(byteCodes, table);

   597                     table += 4;

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

   599                     while (low <= high) {

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

   601                         table += 4;

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

   603                         low++;

   604                     }

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

   606                     i = table - 1;

   607                     break;

   608                 }

   609                 case bc_invokeinterface: {

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

   611                     break;

   612                 }

   613                 case bc_invokevirtual:

   614                     i = invokeVirtualMethod(byteCodes, i);

   615                     break;

   616                 case bc_invokespecial:

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

   618                     break;

   619                 case bc_invokestatic:

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

   621                     break;

   622                 case bc_new: {

   623                     int indx = readIntArg(byteCodes, i);

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

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

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

   627                     out.append(");");

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

   629                     i += 2;

   630                     break;

   631                 }

   632                 case bc_newarray: {

   633                     int type = byteCodes[i++];

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

   635                     break;

   636                 }

   637                 case bc_anewarray: {

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

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

   640                     break;

   641                 }

   642                 case bc_arraylength:

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

   644                     break;

   645                 case bc_iastore:

   646                 case bc_lastore:

   647                 case bc_fastore:

   648                 case bc_dastore:

   649                 case bc_aastore:

   650                 case bc_bastore:

   651                 case bc_castore:

   652                 case bc_sastore: {

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

   654                     break;

   655                 }

   656                 case bc_iaload:

   657                 case bc_laload:

   658                 case bc_faload:

   659                 case bc_daload:

   660                 case bc_aaload:

   661                 case bc_baload:

   662                 case bc_caload:

   663                 case bc_saload: {

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

   665                     break;

   666                 }

   667                 case bc_pop2:

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

   669                 case bc_pop:

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

   671                     break;

   672                 case bc_dup:

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

   674                     break;

   675                 case bc_bipush:

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

   677                     break;

   678                 case bc_sipush:

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

   680                     i += 2;

   681                     break;

   682                 case bc_getfield: {

   683                     int indx = readIntArg(byteCodes, i);

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

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

   686                     i += 2;

   687                     break;

   688                 }

   689                 case bc_getstatic: {

   690                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   695                     i += 2;

   696                     addReference(in);

   697                     break;

   698                 }

   699                 case bc_putstatic: {

   700                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   705                     i += 2;

   706                     addReference(in);

   707                     break;

   708                 }

   709                 case bc_putfield: {

   710                     int indx = readIntArg(byteCodes, i);

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

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

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

   714                     i += 2;

   715                     break;

   716                 }

   717                 case bc_checkcast: {

   718                     int indx = readIntArg(byteCodes, i);

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

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

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

   722                         // no way to check arrays right now

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

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

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

   726                     }

   727                     i += 2;

   728                     break;

   729                 }

   730                 case bc_instanceof: {

   731                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   736                     i += 2;

   737                     break;

   738                 }

   739                 case bc_athrow: {

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

   741                     break;

   742                 }

   743                 default: {

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

   745                 }

   747             }

   748             out.append(" //");

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

   750                 out.append(" ");

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

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

   753             }

   754             out.append("\n");

   755         }

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

   757     }

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

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

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

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

   763         return i + 2;

   764     }

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

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

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

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

   770     }

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

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

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

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

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

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

   777     }

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

   780         int cnt = 0;

   781         int i = 0;

   782         Boolean count = null;

   783         boolean array = false;

   784         int firstPos = sig.length();

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

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

   787             switch (ch) {

   788                 case '(':

   789                     count = true;

   790                     continue;

   791                 case ')':

   792                     count = false;

   793                     continue;

   794                 case 'A':

   795                     array = true;

   796                     break;

   797                 case 'B':

   798                 case 'C':

   799                 case 'D':

   800                 case 'F':

   801                 case 'I':

   802                 case 'J':

   803                 case 'S':

   804                 case 'Z':

   805                     if (count) {

   806                         cnt++;

   807                         if (array) {

   808                             sig.append('A');

   809                         }

   810                         sig.append(ch);

   811                     } else {

   812                         hasReturnType[0] = true;

   813                         sig.insert(firstPos, ch);

   814                         if (array) {

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

   816                         }

   817                     }

   818                     array = false;

   819                     continue;

   820                 case 'V':

   821                     assert !count;

   822                     hasReturnType[0] = false;

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

   824                     continue;

   825                 case 'L':

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

   827                     if (count) {

   828                         cnt++;

   829                         if (array) {

   830                             sig.append('A');

   831                         }

   832                         sig.append(ch);

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

   834                     } else {

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

   836                         sig.insert(firstPos, ch);

   837                         if (array) {

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

   839                         }

   840                         hasReturnType[0] = true;

   841                     }

   842                     i = next + 1;

   843                     continue;

   844                 case '[':

   845                     //arrays++;

   846                     continue;

   847                 default:

   848                     break; // invalid character

   849             }

   850         }

   851         return cnt;

   852     }

   854     private void generateStaticField(Variable v) throws IOException {

   855         out.append("\nvar ")

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

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

   858     }

   860     private String findMethodName(Method m) {

   861         StringBuilder name = new StringBuilder();

   862         String descr = m.getDescriptor();

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

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

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

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

   867         } else {

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

   869         }

   871         boolean hasReturn[] = { false };

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

   873         return name.toString();

   874     }

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

   877         StringBuilder name = new StringBuilder();

   878         String descr = mi.getDescriptor();

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

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

   881         } else {

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

   883         }

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

   885         return name.toString();

   886     }

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

   889     throws IOException {

   890         int methodIndex = readIntArg(byteCodes, i);

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

   892         boolean[] hasReturn = { false };

   893         int[] cnt = { 0 };

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

   895         out.append("{ ");

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

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

   898         }

   900         if (hasReturn[0]) {

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

   902         }

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

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

   905         if (isStatic) {

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

   907         } else {

   908             out.append('_');

   909         }

   910         out.append(mn);

   911         out.append('(');

   912         String sep = "";

   913         if (!isStatic) {

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

   915             sep = ", ";

   916         }

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

   918             out.append(sep);

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

   920             sep = ", ";

   921         }

   922         out.append(")");

   923         if (hasReturn[0]) {

   924             out.append(")");

   925         }

   926         out.append("; }");

   927         i += 2;

   928         addReference(in);

   929         return i;

   930     }

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

   932     throws IOException {

   933         int methodIndex = readIntArg(byteCodes, i);

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

   935         boolean[] hasReturn = { false };

   936         int[] cnt = { 0 };

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

   938         out.append("{ ");

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

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

   941         }

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

   943         if (hasReturn[0]) {

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

   945         }

   946         out.append("self.");

   947         out.append(mn);

   948         out.append('(');

   949         out.append("self");

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

   951             out.append(", ");

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

   953         }

   954         out.append(")");

   955         if (hasReturn[0]) {

   956             out.append(")");

   957         }

   958         out.append("; }");

   959         i += 2;

   960         return i;

   961     }

   963     private void addReference(String cn) throws IOException {

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

   965         if (references != null) {

   966             references.add(cn);

   967         }

   968     }

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

   971         int arr = 0;

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

   973             out.append('A');

   974             d = d.substring(1);

   975         }

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

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

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

   979         } else {

   980             out.append(d);

   981         }

   982     }

   984     private String encodeConstant(CPEntry entry) {

   985         final String v;

   986         if (entry instanceof CPClassInfo) {

   987             v = "new java_lang_Class";

   988         } else if (entry instanceof CPStringInfo) {

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

   990         } else {

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

   992         }

   993         return v;

   994     }

   996     private String findDescriptor(String d) {

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

   998     }

  1000     private boolean javaScriptBody(Method m, boolean isStatic) throws IOException {

  1001         final ClassName extraAnn = ClassName.getClassName(JavaScriptBody.class.getName().replace('.', '/'));

  1002         Annotation a = m.getAnnotation(extraAnn);

  1003         if (a != null) {

  1004             final ElementValue annVal = a.getComponent("body").getValue();

  1005             String body = ((PrimitiveElementValue) annVal).getValue().getValue().toString();

  1007             final ArrayElementValue arrVal = (ArrayElementValue) a.getComponent("args").getValue();

  1008             final int len = arrVal.getValues().length;

  1009             String[] names = new String[len];

  1010             for (int i = 0; i < len; i++) {

  1011                 names[i] = ((PrimitiveElementValue) arrVal.getValues()[i]).getValue().getValue().toString();

  1012             }

  1013             out.append("\nfunction ").append(

  1014                 jc.getName().getInternalName().replace('/', '_')).append('_').append(findMethodName(m));

  1015             out.append("(");

  1016             String space;

  1017             int index;

  1018             if (!isStatic) {

  1019                 out.append(names[0]);

  1020                 space = ",";

  1021                 index = 1;

  1022             } else {

  1023                 space = "";

  1024                 index = 0;

  1025             }

  1026             List<Parameter> args = m.getParameters();

  1027             for (int i = 0; i < args.size(); i++) {

  1028                 out.append(space);

  1029                 out.append(names[index]);

  1030                 final String desc = findDescriptor(args.get(i).getDescriptor());

  1031                 index++;

  1032                 space = ",";

  1033             }

  1034             out.append(") {").append("\n");

  1035             out.append(body);

  1036             out.append("\n}\n");

  1037             return true;

  1038         }

  1039         return false;

  1040     }

  1041 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Wed, 17 Oct 2012 15:59:04 +0200
changeset 115	3d5597011af0
parent 106	346633cd13d6
child 127	5134b17d623c
permissions	-rw-r--r--