hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@15053b74bdd9

     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.ArrayDeque;

    40 import java.util.ArrayList;

    41 import java.util.Collection;

    42 import java.util.Deque;

    43 import java.util.HashMap;

    44 import java.util.List;

    45 import java.util.Map;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    61 import org.netbeans.modules.classfile.ExceptionTableEntry;

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

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

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

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

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

    68  *

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

    70  */

    71 public final class ByteCodeToJavaScript {

    72     private final ClassFile jc;

    73     private final Appendable out;

    74     private final Collection<? super String> references;

    76     private ByteCodeToJavaScript(

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

    78     ) {

    79         this.jc = jc;

    80         this.out = out;

    81         this.references = references;

    82     }

    84     /**

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

    86      *

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

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

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

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

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

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

    93      *   if one is not interested in knowing references

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

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

    96      *

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

    98      */

   100     public static String compile(

   101         InputStream classFile, Appendable out,

   102         Collection<? super String> references,

   103         Collection<? super String> scripts

   104     ) throws IOException {

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

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

   107         Annotation a = jc.getAnnotation(extraAnn);

   108         if (a != null) {

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

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

   111             scripts.add(res);

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

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

   114                 return null;

   115             }

   116         }

   118         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

   119             jc, out, references

   120         );

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

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

   123             if (m.isStatic()) {

   124                 compiler.generateStaticMethod(m, toInitilize);

   125             } else {

   126                 compiler.generateInstanceMethod(m);

   127             }

   128         }

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

   130             if (v.isStatic()) {

   131                 compiler.generateStaticField(v);

   132             }

   133         }

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

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

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

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

   139             if (!v.isStatic()) {

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

   141             }

   142         }

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

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

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

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

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

   148         ClassName sc = jc.getSuperClass();

   149         if (sc != null) {

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

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

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

   153         }

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

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

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

   157             }

   158         }

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

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

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

   162         }

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

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

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

   166         StringBuilder sb = new StringBuilder();

   167         for (String init : toInitilize) {

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

   169         }

   170         return sb.toString();

   171     }

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

   173         if (javaScriptBody(m, true)) {

   174             return;

   175         }

   176         final String mn = findMethodName(m);

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

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

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

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

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

   182         }

   183         out.append('(');

   184         String space = "";

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

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

   187             out.append(space);

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

   189             space = ",";

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

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

   192                 index += 2;

   193             } else {

   194                 index++;

   195             }

   196         }

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

   198         final Code code = m.getCode();

   199         if (code != null) {

   200             int len = code.getMaxLocals();

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

   202                 out.append("  var ");

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

   204             }

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

   206             produceCode(code.getByteCodes(), code.getExceptionTable());

   207         } else {

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

   209         }

   210         out.append("}");

   211     }

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

   214         final String name = findMethodName(m);

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

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

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

   218     }

   220     private void generateInstanceMethod(Method m) throws IOException {

   221         if (javaScriptBody(m, false)) {

   222             return;

   223         }

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

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

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

   227         out.append("(arg0");

   228         String space = ",";

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

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

   231             out.append(space);

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

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

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

   235                 index += 2;

   236             } else {

   237                 index++;

   238             }

   239         }

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

   241         final Code code = m.getCode();

   242         if (code != null) {

   243             int len = code.getMaxLocals();

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

   245                 out.append("  var ");

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

   247             }

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

   249             produceCode(code.getByteCodes(), code.getExceptionTable());

   250         } else {

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

   252         }

   253         out.append("}");

   254     }

   256     private void produceCode(byte[] byteCodes, ExceptionTableEntry[] exceptionTable) throws IOException {

   257         final Map<Integer, ExceptionTableEntry> exStart = new HashMap<Integer, ExceptionTableEntry>();

   258         final Map<Integer, ExceptionTableEntry> exStop = new HashMap<Integer, ExceptionTableEntry>();

   259         for (ExceptionTableEntry e : exceptionTable) {

   260             exStart.put(e.getStartPC(), e);

   261             exStop.put(e.getEndPC(), e);

   262         }

   263         final Deque<ExceptionTableEntry> current = new ArrayDeque<ExceptionTableEntry>();

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

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

   266             {

   267                 ExceptionTableEntry e = exStart.get(i);

   268                 if (e != null) {

   269                     current.addFirst(e);

   270                 }

   271                 e = exStop.get(i);

   272                 if (e != null) {

   273                     current.remove(e);

   274                 }

   275             }

   276             int prev = i;

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

   278             if (!current.isEmpty()) {

   279                 out.append("try {");

   280             }

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

   282             switch (c) {

   283                 case bc_aload_0:

   284                 case bc_iload_0:

   285                 case bc_lload_0:

   286                 case bc_fload_0:

   287                 case bc_dload_0:

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

   289                     break;

   290                 case bc_aload_1:

   291                 case bc_iload_1:

   292                 case bc_lload_1:

   293                 case bc_fload_1:

   294                 case bc_dload_1:

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

   296                     break;

   297                 case bc_aload_2:

   298                 case bc_iload_2:

   299                 case bc_lload_2:

   300                 case bc_fload_2:

   301                 case bc_dload_2:

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

   303                     break;

   304                 case bc_aload_3:

   305                 case bc_iload_3:

   306                 case bc_lload_3:

   307                 case bc_fload_3:

   308                 case bc_dload_3:

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

   310                     break;

   311                 case bc_iload:

   312                 case bc_lload:

   313                 case bc_fload:

   314                 case bc_dload:

   315                 case bc_aload: {

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

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

   318                     break;

   319                 }

   320                 case bc_istore:

   321                 case bc_lstore:

   322                 case bc_fstore:

   323                 case bc_dstore:

   324                 case bc_astore: {

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

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

   327                     break;

   328                 }

   329                 case bc_astore_0:

   330                 case bc_istore_0:

   331                 case bc_lstore_0:

   332                 case bc_fstore_0:

   333                 case bc_dstore_0:

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

   335                     break;

   336                 case bc_astore_1:

   337                 case bc_istore_1:

   338                 case bc_lstore_1:

   339                 case bc_fstore_1:

   340                 case bc_dstore_1:

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

   342                     break;

   343                 case bc_astore_2:

   344                 case bc_istore_2:

   345                 case bc_lstore_2:

   346                 case bc_fstore_2:

   347                 case bc_dstore_2:

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

   349                     break;

   350                 case bc_astore_3:

   351                 case bc_istore_3:

   352                 case bc_lstore_3:

   353                 case bc_fstore_3:

   354                 case bc_dstore_3:

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

   356                     break;

   357                 case bc_iadd:

   358                 case bc_ladd:

   359                 case bc_fadd:

   360                 case bc_dadd:

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

   362                     break;

   363                 case bc_isub:

   364                 case bc_lsub:

   365                 case bc_fsub:

   366                 case bc_dsub:

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

   368                     break;

   369                 case bc_imul:

   370                 case bc_lmul:

   371                 case bc_fmul:

   372                 case bc_dmul:

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

   374                     break;

   375                 case bc_idiv:

   376                 case bc_ldiv:

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

   378                     break;

   379                 case bc_fdiv:

   380                 case bc_ddiv:

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

   382                     break;

   383                 case bc_iand:

   384                 case bc_land:

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

   386                     break;

   387                 case bc_ior:

   388                 case bc_lor:

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

   390                     break;

   391                 case bc_ixor:

   392                 case bc_lxor:

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

   394                     break;

   395                 case bc_ineg:

   396                 case bc_lneg:

   397                 case bc_fneg:

   398                 case bc_dneg:

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

   400                     break;

   401                 case bc_ishl:

   402                 case bc_lshl:

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

   404                     break;

   405                 case bc_ishr:

   406                 case bc_lshr:

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

   408                     break;

   409                 case bc_iushr:

   410                 case bc_lushr:

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

   412                     break;

   413                 case bc_iinc: {

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

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

   416                     if (incrBy == 1) {

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

   418                     } else {

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

   420                     }

   421                     break;

   422                 }

   423                 case bc_return:

   424                     out.append("return;");

   425                     break;

   426                 case bc_ireturn:

   427                 case bc_lreturn:

   428                 case bc_freturn:

   429                 case bc_dreturn:

   430                 case bc_areturn:

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

   432                     break;

   433                 case bc_i2l:

   434                 case bc_i2f:

   435                 case bc_i2d:

   436                 case bc_l2i:

   437                     // max int check?

   438                 case bc_l2f:

   439                 case bc_l2d:

   440                 case bc_f2d:

   441                 case bc_d2f:

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

   443                     break;

   444                 case bc_f2i:

   445                 case bc_f2l:

   446                 case bc_d2i:

   447                 case bc_d2l:

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

   449                     break;

   450                 case bc_i2b:

   451                 case bc_i2c:

   452                 case bc_i2s:

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

   454                     break;

   455                 case bc_aconst_null:

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

   457                     break;

   458                 case bc_iconst_m1:

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

   460                     break;

   461                 case bc_iconst_0:

   462                 case bc_dconst_0:

   463                 case bc_lconst_0:

   464                 case bc_fconst_0:

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

   466                     break;

   467                 case bc_iconst_1:

   468                 case bc_lconst_1:

   469                 case bc_fconst_1:

   470                 case bc_dconst_1:

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

   472                     break;

   473                 case bc_iconst_2:

   474                 case bc_fconst_2:

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

   476                     break;

   477                 case bc_iconst_3:

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

   479                     break;

   480                 case bc_iconst_4:

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

   482                     break;

   483                 case bc_iconst_5:

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

   485                     break;

   486                 case bc_ldc: {

   487                     int indx = byteCodes[++i];

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

   489                     String v = encodeConstant(entry);

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

   491                     break;

   492                 }

   493                 case bc_ldc_w:

   494                 case bc_ldc2_w: {

   495                     int indx = readIntArg(byteCodes, i);

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

   497                     i += 2;

   498                     String v = encodeConstant(entry);

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

   500                     break;

   501                 }

   502                 case bc_lcmp:

   503                 case bc_fcmpl:

   504                 case bc_fcmpg:

   505                 case bc_dcmpl:

   506                 case bc_dcmpg: {

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

   508                     break;

   509                 }

   510                 case bc_if_acmpeq:

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

   512                     break;

   513                 case bc_if_acmpne:

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

   515                     break;

   516                 case bc_if_icmpeq: {

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

   518                     break;

   519                 }

   520                 case bc_ifeq: {

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

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

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

   524                     i += 2;

   525                     break;

   526                 }

   527                 case bc_ifne: {

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

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

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

   531                     i += 2;

   532                     break;

   533                 }

   534                 case bc_iflt: {

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

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

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

   538                     i += 2;

   539                     break;

   540                 }

   541                 case bc_ifle: {

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

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

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

   545                     i += 2;

   546                     break;

   547                 }

   548                 case bc_ifgt: {

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

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

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

   552                     i += 2;

   553                     break;

   554                 }

   555                 case bc_ifge: {

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

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

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

   559                     i += 2;

   560                     break;

   561                 }

   562                 case bc_ifnonnull: {

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

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

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

   566                     i += 2;

   567                     break;

   568                 }

   569                 case bc_ifnull: {

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

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

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

   573                     i += 2;

   574                     break;

   575                 }

   576                 case bc_if_icmpne:

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

   578                     break;

   579                 case bc_if_icmplt:

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

   581                     break;

   582                 case bc_if_icmple:

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

   584                     break;

   585                 case bc_if_icmpgt:

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

   587                     break;

   588                 case bc_if_icmpge:

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

   590                     break;

   591                 case bc_goto: {

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

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

   594                     i += 2;

   595                     break;

   596                 }

   597                 case bc_invokeinterface: {

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

   599                     break;

   600                 }

   601                 case bc_invokevirtual:

   602                     i = invokeVirtualMethod(byteCodes, i);

   603                     break;

   604                 case bc_invokespecial:

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

   606                     break;

   607                 case bc_invokestatic:

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

   609                     break;

   610                 case bc_new: {

   611                     int indx = readIntArg(byteCodes, i);

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

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

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

   615                     out.append(");");

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

   617                     i += 2;

   618                     break;

   619                 }

   620                 case bc_newarray: {

   621                     int type = byteCodes[i++];

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

   623                     break;

   624                 }

   625                 case bc_anewarray: {

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

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

   628                     break;

   629                 }

   630                 case bc_arraylength:

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

   632                     break;

   633                 case bc_iastore:

   634                 case bc_lastore:

   635                 case bc_fastore:

   636                 case bc_dastore:

   637                 case bc_aastore:

   638                 case bc_bastore:

   639                 case bc_castore:

   640                 case bc_sastore: {

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

   642                     break;

   643                 }

   644                 case bc_iaload:

   645                 case bc_laload:

   646                 case bc_faload:

   647                 case bc_daload:

   648                 case bc_aaload:

   649                 case bc_baload:

   650                 case bc_caload:

   651                 case bc_saload: {

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

   653                     break;

   654                 }

   655                 case bc_pop2:

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

   657                 case bc_pop:

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

   659                     break;

   660                 case bc_dup:

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

   662                     break;

   663                 case bc_bipush:

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

   665                     break;

   666                 case bc_sipush:

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

   668                     i += 2;

   669                     break;

   670                 case bc_getfield: {

   671                     int indx = readIntArg(byteCodes, i);

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

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

   674                     i += 2;

   675                     break;

   676                 }

   677                 case bc_getstatic: {

   678                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   683                     i += 2;

   684                     addReference(in);

   685                     break;

   686                 }

   687                 case bc_putstatic: {

   688                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   693                     i += 2;

   694                     addReference(in);

   695                     break;

   696                 }

   697                 case bc_putfield: {

   698                     int indx = readIntArg(byteCodes, i);

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

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

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

   702                     i += 2;

   703                     break;

   704                 }

   705                 case bc_checkcast: {

   706                     int indx = readIntArg(byteCodes, i);

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

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

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

   710                         // no way to check arrays right now

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

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

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

   714                     }

   715                     i += 2;

   716                     break;

   717                 }

   718                 case bc_instanceof: {

   719                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   724                     i += 2;

   725                     break;

   726                 }

   727                 case bc_athrow: {

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

   729                     break;

   730                 }

   731                 default: {

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

   733                 }

   735             }

   736             if (!current.isEmpty()) {

   737                 out.append("} catch (e) {");

   738                 for (ExceptionTableEntry e : current) {

   739                     if (e.getCatchType() != null) {

   740                         final String classInternalName = e.getCatchType().getClassName().getInternalName();

   741                         addReference(classInternalName);

   742                         out.append("if (e.$instOf_"+classInternalName.replace('/', '_')+") {");

   743                         out.append("gt="+e.getHandlerPC()+"; continue;");

   744                         out.append("} ");

   745                     } else {

   746                         //finally - todo

   747                     }

   748                 }

   749                 out.append("throw e;");

   750                 out.append("}");

   751             }

   752             out.append(" //");

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

   754                 out.append(" ");

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

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

   757             }

   758             out.append("\n");

   759         }

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

   761     }

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

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

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

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

   767         return i + 2;

   768     }

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

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

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

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

   774     }

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

   777         int cnt = 0;

   778         int i = 0;

   779         Boolean count = null;

   780         boolean array = false;

   781         int firstPos = sig.length();

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

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

   784             switch (ch) {

   785                 case '(':

   786                     count = true;

   787                     continue;

   788                 case ')':

   789                     count = false;

   790                     continue;

   791                 case 'A':

   792                     array = true;

   793                     break;

   794                 case 'B':

   795                 case 'C':

   796                 case 'D':

   797                 case 'F':

   798                 case 'I':

   799                 case 'J':

   800                 case 'S':

   801                 case 'Z':

   802                     if (count) {

   803                         cnt++;

   804                         if (array) {

   805                             sig.append('A');

   806                         }

   807                         sig.append(ch);

   808                     } else {

   809                         hasReturnType[0] = true;

   810                         sig.insert(firstPos, ch);

   811                         if (array) {

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

   813                         }

   814                     }

   815                     array = false;

   816                     continue;

   817                 case 'V':

   818                     assert !count;

   819                     hasReturnType[0] = false;

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

   821                     continue;

   822                 case 'L':

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

   824                     if (count) {

   825                         cnt++;

   826                         if (array) {

   827                             sig.append('A');

   828                         }

   829                         sig.append(ch);

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

   831                     } else {

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

   833                         sig.insert(firstPos, ch);

   834                         if (array) {

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

   836                         }

   837                         hasReturnType[0] = true;

   838                     }

   839                     i = next + 1;

   840                     continue;

   841                 case '[':

   842                     //arrays++;

   843                     continue;

   844                 default:

   845                     break; // invalid character

   846             }

   847         }

   848         return cnt;

   849     }

   851     private void generateStaticField(Variable v) throws IOException {

   852         out.append("\nvar ")

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

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

   855     }

   857     private String findMethodName(Method m) {

   858         StringBuilder name = new StringBuilder();

   859         String descr = m.getDescriptor();

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

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

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

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

   864         } else {

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

   866         }

   868         boolean hasReturn[] = { false };

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

   870         return name.toString();

   871     }

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

   874         StringBuilder name = new StringBuilder();

   875         String descr = mi.getDescriptor();

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

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

   878         } else {

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

   880         }

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

   882         return name.toString();

   883     }

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

   886     throws IOException {

   887         int methodIndex = readIntArg(byteCodes, i);

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

   889         boolean[] hasReturn = { false };

   890         int[] cnt = { 0 };

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

   892         out.append("{ ");

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

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

   895         }

   897         if (hasReturn[0]) {

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

   899         }

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

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

   902         if (isStatic) {

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

   904         } else {

   905             out.append('_');

   906         }

   907         out.append(mn);

   908         out.append('(');

   909         String sep = "";

   910         if (!isStatic) {

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

   912             sep = ", ";

   913         }

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

   915             out.append(sep);

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

   917             sep = ", ";

   918         }

   919         out.append(")");

   920         if (hasReturn[0]) {

   921             out.append(")");

   922         }

   923         out.append("; }");

   924         i += 2;

   925         addReference(in);

   926         return i;

   927     }

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

   929     throws IOException {

   930         int methodIndex = readIntArg(byteCodes, i);

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

   932         boolean[] hasReturn = { false };

   933         int[] cnt = { 0 };

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

   935         out.append("{ ");

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

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

   938         }

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

   940         if (hasReturn[0]) {

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

   942         }

   943         out.append("self.");

   944         out.append(mn);

   945         out.append('(');

   946         out.append("self");

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

   948             out.append(", ");

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

   950         }

   951         out.append(")");

   952         if (hasReturn[0]) {

   953             out.append(")");

   954         }

   955         out.append("; }");

   956         i += 2;

   957         return i;

   958     }

   960     private void addReference(String cn) throws IOException {

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

   962         if (references != null) {

   963             references.add(cn);

   964         }

   965     }

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

   968         int arr = 0;

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

   970             out.append('A');

   971             d = d.substring(1);

   972         }

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

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

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

   976         } else {

   977             out.append(d);

   978         }

   979     }

   981     private String encodeConstant(CPEntry entry) {

   982         final String v;

   983         if (entry instanceof CPClassInfo) {

   984             v = "new java_lang_Class";

   985         } else if (entry instanceof CPStringInfo) {

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

   987         } else {

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

   989         }

   990         return v;

   991     }

   993     private String findDescriptor(String d) {

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

   995     }

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

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

   999         Annotation a = m.getAnnotation(extraAnn);

  1000         if (a != null) {

  1001             final ElementValue annVal = a.getComponent("body").getValue();

  1002             String body = ((PrimitiveElementValue) annVal).getValue().getValue().toString();

  1004             final ArrayElementValue arrVal = (ArrayElementValue) a.getComponent("args").getValue();

  1005             final int len = arrVal.getValues().length;

  1006             String[] names = new String[len];

  1007             for (int i = 0; i < len; i++) {

  1008                 names[i] = ((PrimitiveElementValue) arrVal.getValues()[i]).getValue().getValue().toString();

  1009             }

  1010             out.append("\nfunction ").append(

  1011                 jc.getName().getInternalName().replace('/', '_')).append('_').append(findMethodName(m));

  1012             out.append("(");

  1013             String space;

  1014             int index;

  1015             if (!isStatic) {

  1016                 out.append(names[0]);

  1017                 space = ",";

  1018                 index = 1;

  1019             } else {

  1020                 space = "";

  1021                 index = 0;

  1022             }

  1023             List<Parameter> args = m.getParameters();

  1024             for (int i = 0; i < args.size(); i++) {

  1025                 out.append(space);

  1026                 out.append(names[index]);

  1027                 final String desc = findDescriptor(args.get(i).getDescriptor());

  1028                 index++;

  1029                 space = ",";

  1030             }

  1031             out.append(") {").append("\n");

  1032             out.append(body);

  1033             out.append("\n}\n");

  1034             return true;

  1035         }

  1036         return false;

  1037     }

  1038 }

author	tzezula
	Sat, 08 Dec 2012 08:50:32 +0100
branch	exceptions
changeset 286	15053b74bdd9
parent 106	346633cd13d6
child 287	6f696a0ef12f
permissions	-rw-r--r--