hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@67e892757752

     1 /*

     2 Java 4 Browser Bytecode Translator

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

     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.

     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.

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

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

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

    17 */

    18 package org.apidesign.vm4brwsr;

    20 import java.io.IOException;

    21 import java.io.InputStream;

    22 import java.util.ArrayList;

    23 import java.util.Collection;

    24 import java.util.List;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    46  *

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

    48  */

    49 public final class ByteCodeToJavaScript {

    50     private final ClassFile jc;

    51     private final Appendable out;

    52     private final Collection<? super String> references;

    54     private ByteCodeToJavaScript(

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

    56     ) {

    57         this.jc = jc;

    58         this.out = out;

    59         this.references = references;

    60     }

    62     /**

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

    64      *

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

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

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

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

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

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

    71      *   if one is not interested in knowing references

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

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

    74      *

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

    76      */

    78     public static String compile(

    79         InputStream classFile, Appendable out,

    80         Collection<? super String> references,

    81         Collection<? super String> scripts

    82     ) throws IOException {

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

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

    85         Annotation a = jc.getAnnotation(extraAnn);

    86         if (a != null) {

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

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

    89             scripts.add(res);

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

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

    92                 return null;

    93             }

    94         }

    96         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

    97             jc, out, references

    98         );

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

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

   101             if (m.isStatic()) {

   102                 compiler.generateStaticMethod(m, toInitilize);

   103             } else {

   104                 compiler.generateInstanceMethod(m);

   105             }

   106         }

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

   108             if (v.isStatic()) {

   109                 compiler.generateStaticField(v);

   110             }

   111         }

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

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

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

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

   117             if (!v.isStatic()) {

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

   119             }

   120         }

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

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

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

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

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

   126         ClassName sc = jc.getSuperClass();

   127         if (sc != null) {

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

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

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

   131         }

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

   133             if (!m.isStatic() && !m.isPrivate() && !m.getName().contains("<init>")) {

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

   135             }

   136         }

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

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

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

   140         }

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

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

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

   144         StringBuilder sb = new StringBuilder();

   145         for (String init : toInitilize) {

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

   147         }

   148         return sb.toString();

   149     }

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

   151         if (javaScriptBody(m, true)) {

   152             return;

   153         }

   154         final String mn = findMethodName(m);

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

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

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

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

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

   160         }

   161         out.append('(');

   162         String space = "";

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

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

   165             out.append(space);

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

   167             space = ",";

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

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

   170                 index += 2;

   171             } else {

   172                 index++;

   173             }

   174         }

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

   176         final Code code = m.getCode();

   177         if (code != null) {

   178             int len = code.getMaxLocals();

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

   180                 out.append("  var ");

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

   182             }

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

   184             produceCode(code.getByteCodes());

   185         } else {

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

   187         }

   188         out.append("}");

   189     }

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

   192         final String name = findMethodName(m);

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

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

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

   196     }

   198     private void generateInstanceMethod(Method m) throws IOException {

   199         if (javaScriptBody(m, false)) {

   200             return;

   201         }

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

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

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

   205         out.append("(arg0");

   206         String space = ",";

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

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

   209             out.append(space);

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

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

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

   213                 index += 2;

   214             } else {

   215                 index++;

   216             }

   217         }

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

   219         final Code code = m.getCode();

   220         if (code != null) {

   221             int len = code.getMaxLocals();

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

   223                 out.append("  var ");

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

   225             }

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

   227             produceCode(code.getByteCodes());

   228         } else {

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

   230         }

   231         out.append("}");

   232     }

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

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

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

   237             int prev = i;

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

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

   240             switch (c) {

   241                 case bc_aload_0:

   242                 case bc_iload_0:

   243                 case bc_lload_0:

   244                 case bc_fload_0:

   245                 case bc_dload_0:

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

   247                     break;

   248                 case bc_aload_1:

   249                 case bc_iload_1:

   250                 case bc_lload_1:

   251                 case bc_fload_1:

   252                 case bc_dload_1:

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

   254                     break;

   255                 case bc_aload_2:

   256                 case bc_iload_2:

   257                 case bc_lload_2:

   258                 case bc_fload_2:

   259                 case bc_dload_2:

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

   261                     break;

   262                 case bc_aload_3:

   263                 case bc_iload_3:

   264                 case bc_lload_3:

   265                 case bc_fload_3:

   266                 case bc_dload_3:

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

   268                     break;

   269                 case bc_iload:

   270                 case bc_lload:

   271                 case bc_fload:

   272                 case bc_dload:

   273                 case bc_aload: {

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

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

   276                     break;

   277                 }

   278                 case bc_istore:

   279                 case bc_lstore:

   280                 case bc_fstore:

   281                 case bc_dstore:

   282                 case bc_astore: {

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

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

   285                     break;

   286                 }

   287                 case bc_astore_0:

   288                 case bc_istore_0:

   289                 case bc_lstore_0:

   290                 case bc_fstore_0:

   291                 case bc_dstore_0:

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

   293                     break;

   294                 case bc_astore_1:

   295                 case bc_istore_1:

   296                 case bc_lstore_1:

   297                 case bc_fstore_1:

   298                 case bc_dstore_1:

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

   300                     break;

   301                 case bc_astore_2:

   302                 case bc_istore_2:

   303                 case bc_lstore_2:

   304                 case bc_fstore_2:

   305                 case bc_dstore_2:

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

   307                     break;

   308                 case bc_astore_3:

   309                 case bc_istore_3:

   310                 case bc_lstore_3:

   311                 case bc_fstore_3:

   312                 case bc_dstore_3:

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

   314                     break;

   315                 case bc_iadd:

   316                 case bc_ladd:

   317                 case bc_fadd:

   318                 case bc_dadd:

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

   320                     break;

   321                 case bc_isub:

   322                 case bc_lsub:

   323                 case bc_fsub:

   324                 case bc_dsub:

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

   326                     break;

   327                 case bc_imul:

   328                 case bc_lmul:

   329                 case bc_fmul:

   330                 case bc_dmul:

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

   332                     break;

   333                 case bc_idiv:

   334                 case bc_ldiv:

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

   336                     break;

   337                 case bc_fdiv:

   338                 case bc_ddiv:

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

   340                     break;

   341                 case bc_iand:

   342                 case bc_land:

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

   344                     break;

   345                 case bc_ior:

   346                 case bc_lor:

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

   348                     break;

   349                 case bc_ixor:

   350                 case bc_lxor:

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

   352                     break;

   353                 case bc_ineg:

   354                 case bc_lneg:

   355                 case bc_fneg:

   356                 case bc_dneg:

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

   358                     break;

   359                 case bc_ishl:

   360                 case bc_lshl:

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

   362                     break;

   363                 case bc_ishr:

   364                 case bc_lshr:

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

   366                     break;

   367                 case bc_iushr:

   368                 case bc_lushr:

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

   370                     break;

   371                 case bc_iinc: {

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

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

   374                     if (incrBy == 1) {

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

   376                     } else {

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

   378                     }

   379                     break;

   380                 }

   381                 case bc_return:

   382                     out.append("return;");

   383                     break;

   384                 case bc_ireturn:

   385                 case bc_lreturn:

   386                 case bc_freturn:

   387                 case bc_dreturn:

   388                 case bc_areturn:

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

   390                     break;

   391                 case bc_i2l:

   392                 case bc_i2f:

   393                 case bc_i2d:

   394                 case bc_l2i:

   395                     // max int check?

   396                 case bc_l2f:

   397                 case bc_l2d:

   398                 case bc_f2d:

   399                 case bc_d2f:

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

   401                     break;

   402                 case bc_f2i:

   403                 case bc_f2l:

   404                 case bc_d2i:

   405                 case bc_d2l:

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

   407                     break;

   408                 case bc_i2b:

   409                 case bc_i2c:

   410                 case bc_i2s:

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

   412                     break;

   413                 case bc_aconst_null:

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

   415                     break;

   416                 case bc_iconst_m1:

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

   418                     break;

   419                 case bc_iconst_0:

   420                 case bc_dconst_0:

   421                 case bc_lconst_0:

   422                 case bc_fconst_0:

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

   424                     break;

   425                 case bc_iconst_1:

   426                 case bc_lconst_1:

   427                 case bc_fconst_1:

   428                 case bc_dconst_1:

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

   430                     break;

   431                 case bc_iconst_2:

   432                 case bc_fconst_2:

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

   434                     break;

   435                 case bc_iconst_3:

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

   437                     break;

   438                 case bc_iconst_4:

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

   440                     break;

   441                 case bc_iconst_5:

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

   443                     break;

   444                 case bc_ldc: {

   445                     int indx = byteCodes[++i];

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

   447                     String v = encodeConstant(entry);

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

   449                     break;

   450                 }

   451                 case bc_ldc_w:

   452                 case bc_ldc2_w: {

   453                     int indx = readIntArg(byteCodes, i);

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

   455                     i += 2;

   456                     String v = encodeConstant(entry);

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

   458                     break;

   459                 }

   460                 case bc_lcmp:

   461                 case bc_fcmpl:

   462                 case bc_fcmpg:

   463                 case bc_dcmpl:

   464                 case bc_dcmpg: {

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

   466                     break;

   467                 }

   468                 case bc_if_icmpeq: {

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

   470                     break;

   471                 }

   472                 case bc_ifeq: {

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

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

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

   476                     i += 2;

   477                     break;

   478                 }

   479                 case bc_ifne: {

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

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

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

   483                     i += 2;

   484                     break;

   485                 }

   486                 case bc_iflt: {

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

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

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

   490                     i += 2;

   491                     break;

   492                 }

   493                 case bc_ifle: {

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

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

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

   497                     i += 2;

   498                     break;

   499                 }

   500                 case bc_ifgt: {

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

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

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

   504                     i += 2;

   505                     break;

   506                 }

   507                 case bc_ifge: {

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

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

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

   511                     i += 2;

   512                     break;

   513                 }

   514                 case bc_ifnonnull: {

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

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

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

   518                     i += 2;

   519                     break;

   520                 }

   521                 case bc_ifnull: {

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

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

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

   525                     i += 2;

   526                     break;

   527                 }

   528                 case bc_if_icmpne:

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

   530                     break;

   531                 case bc_if_icmplt:

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

   533                     break;

   534                 case bc_if_icmple:

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

   536                     break;

   537                 case bc_if_icmpgt:

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

   539                     break;

   540                 case bc_if_icmpge:

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

   542                     break;

   543                 case bc_goto: {

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

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

   546                     i += 2;

   547                     break;

   548                 }

   549                 case bc_invokeinterface: {

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

   551                     break;

   552                 }

   553                 case bc_invokevirtual:

   554                     i = invokeVirtualMethod(byteCodes, i);

   555                     break;

   556                 case bc_invokespecial:

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

   558                     break;

   559                 case bc_invokestatic:

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

   561                     break;

   562                 case bc_new: {

   563                     int indx = readIntArg(byteCodes, i);

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

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

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

   567                     out.append(");");

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

   569                     i += 2;

   570                     break;

   571                 }

   572                 case bc_newarray: {

   573                     int type = byteCodes[i++];

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

   575                     break;

   576                 }

   577                 case bc_anewarray: {

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

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

   580                     break;

   581                 }

   582                 case bc_arraylength:

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

   584                     break;

   585                 case bc_iastore:

   586                 case bc_lastore:

   587                 case bc_fastore:

   588                 case bc_dastore:

   589                 case bc_aastore:

   590                 case bc_bastore:

   591                 case bc_castore:

   592                 case bc_sastore: {

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

   594                     break;

   595                 }

   596                 case bc_iaload:

   597                 case bc_laload:

   598                 case bc_faload:

   599                 case bc_daload:

   600                 case bc_aaload:

   601                 case bc_baload:

   602                 case bc_caload:

   603                 case bc_saload: {

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

   605                     break;

   606                 }

   607                 case bc_pop2:

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

   609                 case bc_pop:

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

   611                     break;

   612                 case bc_dup:

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

   614                     break;

   615                 case bc_bipush:

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

   617                     break;

   618                 case bc_sipush:

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

   620                     i += 2;

   621                     break;

   622                 case bc_getfield: {

   623                     int indx = readIntArg(byteCodes, i);

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

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

   626                     i += 2;

   627                     break;

   628                 }

   629                 case bc_getstatic: {

   630                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   635                     i += 2;

   636                     addReference(in);

   637                     break;

   638                 }

   639                 case bc_putstatic: {

   640                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   645                     i += 2;

   646                     addReference(in);

   647                     break;

   648                 }

   649                 case bc_putfield: {

   650                     int indx = readIntArg(byteCodes, i);

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

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

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

   654                     i += 2;

   655                     break;

   656                 }

   657                 case bc_checkcast: {

   658                     int indx = readIntArg(byteCodes, i);

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

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

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

   662                         // no way to check arrays right now

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

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

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

   666                     }

   667                     i += 2;

   668                     break;

   669                 }

   670                 case bc_instanceof: {

   671                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   676                     i += 2;

   677                     break;

   678                 }

   680             }

   681             out.append(" //");

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

   683                 out.append(" ");

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

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

   686             }

   687             out.append("\n");

   688         }

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

   690     }

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

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

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

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

   696         return i + 2;

   697     }

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

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

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

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

   703     }

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

   706         int cnt = 0;

   707         int i = 0;

   708         Boolean count = null;

   709         boolean array = false;

   710         int firstPos = sig.length();

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

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

   713             switch (ch) {

   714                 case '(':

   715                     count = true;

   716                     continue;

   717                 case ')':

   718                     count = false;

   719                     continue;

   720                 case 'A':

   721                     array = true;

   722                     break;

   723                 case 'B':

   724                 case 'C':

   725                 case 'D':

   726                 case 'F':

   727                 case 'I':

   728                 case 'J':

   729                 case 'S':

   730                 case 'Z':

   731                     if (count) {

   732                         cnt++;

   733                         if (array) {

   734                             sig.append('A');

   735                         }

   736                         sig.append(ch);

   737                     } else {

   738                         hasReturnType[0] = true;

   739                         sig.insert(firstPos, ch);

   740                         if (array) {

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

   742                         }

   743                     }

   744                     array = false;

   745                     continue;

   746                 case 'V':

   747                     assert !count;

   748                     hasReturnType[0] = false;

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

   750                     continue;

   751                 case 'L':

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

   753                     if (count) {

   754                         cnt++;

   755                         if (array) {

   756                             sig.append('A');

   757                         }

   758                         sig.append(ch);

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

   760                     } else {

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

   762                         sig.insert(firstPos, ch);

   763                         if (array) {

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

   765                         }

   766                         hasReturnType[0] = true;

   767                     }

   768                     i = next + 1;

   769                     continue;

   770                 case '[':

   771                     //arrays++;

   772                     continue;

   773                 default:

   774                     break; // invalid character

   775             }

   776         }

   777         return cnt;

   778     }

   780     private void generateStaticField(Variable v) throws IOException {

   781         out.append("\nvar ")

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

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

   784     }

   786     private String findMethodName(Method m) {

   787         StringBuilder name = new StringBuilder();

   788         String descr = m.getDescriptor();

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

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

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

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

   793         } else {

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

   795         }

   797         boolean hasReturn[] = { false };

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

   799         return name.toString();

   800     }

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

   803         StringBuilder name = new StringBuilder();

   804         String descr = mi.getDescriptor();

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

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

   807         } else {

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

   809         }

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

   811         return name.toString();

   812     }

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

   815     throws IOException {

   816         int methodIndex = readIntArg(byteCodes, i);

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

   818         boolean[] hasReturn = { false };

   819         int[] cnt = { 0 };

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

   821         out.append("{ ");

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

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

   824         }

   826         if (hasReturn[0]) {

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

   828         }

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

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

   831         out.append('_');

   832         out.append(mn);

   833         out.append('(');

   834         String sep = "";

   835         if (!isStatic) {

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

   837             sep = ", ";

   838         }

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

   840             out.append(sep);

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

   842             sep = ", ";

   843         }

   844         out.append(")");

   845         if (hasReturn[0]) {

   846             out.append(")");

   847         }

   848         out.append("; }");

   849         i += 2;

   850         addReference(in);

   851         return i;

   852     }

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

   854     throws IOException {

   855         int methodIndex = readIntArg(byteCodes, i);

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

   857         boolean[] hasReturn = { false };

   858         int[] cnt = { 0 };

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

   860         out.append("{ ");

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

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

   863         }

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

   865         if (hasReturn[0]) {

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

   867         }

   868         out.append("self.");

   869         out.append(mn);

   870         out.append('(');

   871         out.append("self");

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

   873             out.append(", ");

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

   875         }

   876         out.append(")");

   877         if (hasReturn[0]) {

   878             out.append(")");

   879         }

   880         out.append("; }");

   881         i += 2;

   882         return i;

   883     }

   885     private void addReference(String cn) {

   886         if (references != null) {

   887             references.add(cn);

   888         }

   889     }

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

   892         int arr = 0;

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

   894             out.append('A');

   895             d = d.substring(1);

   896         }

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

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

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

   900         } else {

   901             out.append(d);

   902         }

   903     }

   905     private String encodeConstant(CPEntry entry) {

   906         final String v;

   907         if (entry instanceof CPClassInfo) {

   908             v = "new java_lang_Class";

   909         } else if (entry instanceof CPStringInfo) {

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

   911         } else {

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

   913         }

   914         return v;

   915     }

   917     private String findDescriptor(String d) {

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

   919     }

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

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

   923         Annotation a = m.getAnnotation(extraAnn);

   924         if (a != null) {

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

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

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

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

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

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

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

   933             }

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

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

   936             out.append("(");

   937             String space;

   938             int index;

   939             if (!isStatic) {

   940                 out.append(names[0]);

   941                 space = ",";

   942                 index = 1;

   943             } else {

   944                 space = "";

   945                 index = 0;

   946             }

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

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

   949                 out.append(space);

   950                 out.append(names[index]);

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

   952                 index++;

   953                 space = ",";

   954             }

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

   956             out.append(body);

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

   958             return true;

   959         }

   960         return false;

   961     }

   962 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Thu, 11 Oct 2012 04:11:42 -0700
branch	emul
changeset 99	67e892757752
parent 98	9fb17a3cbbb6
child 102	2354255a1844
permissions	-rw-r--r--