hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@519bcc6999c4

     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      *

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

    75      */

    77     public static void compile(

    78         InputStream classFile, Appendable out,

    79         Collection<? super String> references,

    80         Collection<? super String> scripts

    81     ) throws IOException {

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

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

    84         Annotation a = jc.getAnnotation(extraAnn);

    85         if (a != null) {

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

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

    88             scripts.add(res);

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

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

    91                 return;

    92             }

    93         }

    95         ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(

    96             jc, out, references

    97         );

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

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

   100             if (m.isStatic()) {

   101                 compiler.generateStaticMethod(m, toInitilize);

   102             } else {

   103                 compiler.generateInstanceMethod(m);

   104             }

   105         }

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

   107             if (v.isStatic()) {

   108                 compiler.generateStaticField(v);

   109             }

   110         }

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

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

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

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

   116             if (!v.isStatic()) {

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

   118             }

   119         }

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

   121         ClassName sc = jc.getSuperClass();

   122         if (sc != null) {

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

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

   125         }

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

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

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

   129             }

   130         }

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

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

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

   134         }

   135         for (String init : toInitilize) {

   136             out.append("\n").append(init).append("();");

   137         }

   138     }

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

   140         if (javaScriptBody(m, true)) {

   141             return;

   142         }

   143         final String mn = findMethodName(m);

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

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

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

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

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

   149         }

   150         out.append('(');

   151         String space = "";

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

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

   154             out.append(space);

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

   156             space = ",";

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

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

   159                 index += 2;

   160             } else {

   161                 index++;

   162             }

   163         }

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

   165         final Code code = m.getCode();

   166         if (code != null) {

   167             int len = code.getMaxLocals();

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

   169                 out.append("  var ");

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

   171             }

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

   173             produceCode(code.getByteCodes());

   174         } else {

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

   176         }

   177         out.append("}");

   178     }

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

   181         final String name = findMethodName(m);

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

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

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

   185     }

   187     private void generateInstanceMethod(Method m) throws IOException {

   188         if (javaScriptBody(m, false)) {

   189             return;

   190         }

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

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

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

   194         out.append("(arg0");

   195         String space = ",";

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

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

   198             out.append(space);

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

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

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

   202                 index += 2;

   203             } else {

   204                 index++;

   205             }

   206         }

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

   208         final Code code = m.getCode();

   209         if (code != null) {

   210             int len = code.getMaxLocals();

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

   212                 out.append("  var ");

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

   214             }

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

   216             produceCode(code.getByteCodes());

   217         } else {

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

   219         }

   220         out.append("}");

   221     }

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

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

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

   226             int prev = i;

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

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

   229             switch (c) {

   230                 case bc_aload_0:

   231                 case bc_iload_0:

   232                 case bc_lload_0:

   233                 case bc_fload_0:

   234                 case bc_dload_0:

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

   236                     break;

   237                 case bc_aload_1:

   238                 case bc_iload_1:

   239                 case bc_lload_1:

   240                 case bc_fload_1:

   241                 case bc_dload_1:

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

   243                     break;

   244                 case bc_aload_2:

   245                 case bc_iload_2:

   246                 case bc_lload_2:

   247                 case bc_fload_2:

   248                 case bc_dload_2:

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

   250                     break;

   251                 case bc_aload_3:

   252                 case bc_iload_3:

   253                 case bc_lload_3:

   254                 case bc_fload_3:

   255                 case bc_dload_3:

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

   257                     break;

   258                 case bc_iload:

   259                 case bc_lload:

   260                 case bc_fload:

   261                 case bc_dload:

   262                 case bc_aload: {

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

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

   265                     break;

   266                 }

   267                 case bc_istore:

   268                 case bc_lstore:

   269                 case bc_fstore:

   270                 case bc_dstore:

   271                 case bc_astore: {

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

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

   274                     break;

   275                 }

   276                 case bc_astore_0:

   277                 case bc_istore_0:

   278                 case bc_lstore_0:

   279                 case bc_fstore_0:

   280                 case bc_dstore_0:

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

   282                     break;

   283                 case bc_astore_1:

   284                 case bc_istore_1:

   285                 case bc_lstore_1:

   286                 case bc_fstore_1:

   287                 case bc_dstore_1:

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

   289                     break;

   290                 case bc_astore_2:

   291                 case bc_istore_2:

   292                 case bc_lstore_2:

   293                 case bc_fstore_2:

   294                 case bc_dstore_2:

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

   296                     break;

   297                 case bc_astore_3:

   298                 case bc_istore_3:

   299                 case bc_lstore_3:

   300                 case bc_fstore_3:

   301                 case bc_dstore_3:

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

   303                     break;

   304                 case bc_iadd:

   305                 case bc_ladd:

   306                 case bc_fadd:

   307                 case bc_dadd:

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

   309                     break;

   310                 case bc_isub:

   311                 case bc_lsub:

   312                 case bc_fsub:

   313                 case bc_dsub:

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

   315                     break;

   316                 case bc_imul:

   317                 case bc_lmul:

   318                 case bc_fmul:

   319                 case bc_dmul:

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

   321                     break;

   322                 case bc_idiv:

   323                 case bc_ldiv:

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

   325                     break;

   326                 case bc_fdiv:

   327                 case bc_ddiv:

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

   329                     break;

   330                 case bc_iand:

   331                 case bc_land:

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

   333                     break;

   334                 case bc_ior:

   335                 case bc_lor:

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

   337                     break;

   338                 case bc_ixor:

   339                 case bc_lxor:

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

   341                     break;

   342                 case bc_ineg:

   343                 case bc_lneg:

   344                 case bc_fneg:

   345                 case bc_dneg:

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

   347                     break;

   348                 case bc_ishl:

   349                 case bc_lshl:

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

   351                     break;

   352                 case bc_ishr:

   353                 case bc_lshr:

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

   355                     break;

   356                 case bc_iushr:

   357                 case bc_lushr:

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

   359                     break;

   360                 case bc_iinc: {

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

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

   363                     if (incrBy == 1) {

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

   365                     } else {

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

   367                     }

   368                     break;

   369                 }

   370                 case bc_return:

   371                     out.append("return;");

   372                     break;

   373                 case bc_ireturn:

   374                 case bc_lreturn:

   375                 case bc_freturn:

   376                 case bc_dreturn:

   377                 case bc_areturn:

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

   379                     break;

   380                 case bc_i2l:

   381                 case bc_i2f:

   382                 case bc_i2d:

   383                 case bc_l2i:

   384                     // max int check?

   385                 case bc_l2f:

   386                 case bc_l2d:

   387                 case bc_f2d:

   388                 case bc_d2f:

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

   390                     break;

   391                 case bc_f2i:

   392                 case bc_f2l:

   393                 case bc_d2i:

   394                 case bc_d2l:

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

   396                     break;

   397                 case bc_i2b:

   398                 case bc_i2c:

   399                 case bc_i2s:

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

   401                     break;

   402                 case bc_aconst_null:

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

   404                     break;

   405                 case bc_iconst_m1:

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

   407                     break;

   408                 case bc_iconst_0:

   409                 case bc_dconst_0:

   410                 case bc_lconst_0:

   411                 case bc_fconst_0:

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

   413                     break;

   414                 case bc_iconst_1:

   415                 case bc_lconst_1:

   416                 case bc_fconst_1:

   417                 case bc_dconst_1:

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

   419                     break;

   420                 case bc_iconst_2:

   421                 case bc_fconst_2:

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

   423                     break;

   424                 case bc_iconst_3:

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

   426                     break;

   427                 case bc_iconst_4:

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

   429                     break;

   430                 case bc_iconst_5:

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

   432                     break;

   433                 case bc_ldc: {

   434                     int indx = byteCodes[++i];

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

   436                     String v = encodeConstant(entry);

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

   438                     break;

   439                 }

   440                 case bc_ldc_w:

   441                 case bc_ldc2_w: {

   442                     int indx = readIntArg(byteCodes, i);

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

   444                     i += 2;

   445                     String v = encodeConstant(entry);

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

   447                     break;

   448                 }

   449                 case bc_lcmp:

   450                 case bc_fcmpl:

   451                 case bc_fcmpg:

   452                 case bc_dcmpl:

   453                 case bc_dcmpg: {

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

   455                     break;

   456                 }

   457                 case bc_if_icmpeq: {

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

   459                     break;

   460                 }

   461                 case bc_ifeq: {

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

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

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

   465                     i += 2;

   466                     break;

   467                 }

   468                 case bc_ifne: {

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

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

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

   472                     i += 2;

   473                     break;

   474                 }

   475                 case bc_iflt: {

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

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

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

   479                     i += 2;

   480                     break;

   481                 }

   482                 case bc_ifle: {

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

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

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

   486                     i += 2;

   487                     break;

   488                 }

   489                 case bc_ifgt: {

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

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

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

   493                     i += 2;

   494                     break;

   495                 }

   496                 case bc_ifge: {

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

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

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

   500                     i += 2;

   501                     break;

   502                 }

   503                 case bc_ifnonnull: {

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

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

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

   507                     i += 2;

   508                     break;

   509                 }

   510                 case bc_ifnull: {

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

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

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

   514                     i += 2;

   515                     break;

   516                 }

   517                 case bc_if_icmpne:

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

   519                     break;

   520                 case bc_if_icmplt:

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

   522                     break;

   523                 case bc_if_icmple:

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

   525                     break;

   526                 case bc_if_icmpgt:

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

   528                     break;

   529                 case bc_if_icmpge:

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

   531                     break;

   532                 case bc_goto: {

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

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

   535                     i += 2;

   536                     break;

   537                 }

   538                 case bc_invokeinterface: {

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

   540                     break;

   541                 }

   542                 case bc_invokevirtual:

   543                     i = invokeVirtualMethod(byteCodes, i);

   544                     break;

   545                 case bc_invokespecial:

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

   547                     break;

   548                 case bc_invokestatic:

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

   550                     break;

   551                 case bc_new: {

   552                     int indx = readIntArg(byteCodes, i);

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

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

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

   556                     out.append(");");

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

   558                     i += 2;

   559                     break;

   560                 }

   561                 case bc_newarray: {

   562                     int type = byteCodes[i++];

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

   564                     break;

   565                 }

   566                 case bc_anewarray: {

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

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

   569                     break;

   570                 }

   571                 case bc_arraylength:

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

   573                     break;

   574                 case bc_iastore:

   575                 case bc_lastore:

   576                 case bc_fastore:

   577                 case bc_dastore:

   578                 case bc_aastore:

   579                 case bc_bastore:

   580                 case bc_castore:

   581                 case bc_sastore: {

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

   583                     break;

   584                 }

   585                 case bc_iaload:

   586                 case bc_laload:

   587                 case bc_faload:

   588                 case bc_daload:

   589                 case bc_aaload:

   590                 case bc_baload:

   591                 case bc_caload:

   592                 case bc_saload: {

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

   594                     break;

   595                 }

   596                 case bc_pop2:

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

   598                 case bc_pop:

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

   600                     break;

   601                 case bc_dup:

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

   603                     break;

   604                 case bc_bipush:

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

   606                     break;

   607                 case bc_sipush:

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

   609                     i += 2;

   610                     break;

   611                 case bc_getfield: {

   612                     int indx = readIntArg(byteCodes, i);

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

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

   615                     i += 2;

   616                     break;

   617                 }

   618                 case bc_getstatic: {

   619                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   624                     i += 2;

   625                     addReference(in);

   626                     break;

   627                 }

   628                 case bc_putstatic: {

   629                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   634                     i += 2;

   635                     addReference(in);

   636                     break;

   637                 }

   638                 case bc_putfield: {

   639                     int indx = readIntArg(byteCodes, i);

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

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

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

   643                     i += 2;

   644                     break;

   645                 }

   646                 case bc_checkcast: {

   647                     int indx = readIntArg(byteCodes, i);

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

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

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

   651                         // no way to check arrays right now

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

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

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

   655                     }

   656                     i += 2;

   657                     break;

   658                 }

   659                 case bc_instanceof: {

   660                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   665                     i += 2;

   666                     break;

   667                 }

   669             }

   670             out.append(" //");

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

   672                 out.append(" ");

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

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

   675             }

   676             out.append("\n");

   677         }

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

   679     }

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

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

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

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

   685         return i + 2;

   686     }

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

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

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

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

   692     }

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

   695         int cnt = 0;

   696         int i = 0;

   697         Boolean count = null;

   698         boolean array = false;

   699         int firstPos = sig.length();

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

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

   702             switch (ch) {

   703                 case '(':

   704                     count = true;

   705                     continue;

   706                 case ')':

   707                     count = false;

   708                     continue;

   709                 case 'A':

   710                     array = true;

   711                     break;

   712                 case 'B':

   713                 case 'C':

   714                 case 'D':

   715                 case 'F':

   716                 case 'I':

   717                 case 'J':

   718                 case 'S':

   719                 case 'Z':

   720                     if (count) {

   721                         cnt++;

   722                         if (array) {

   723                             sig.append('A');

   724                         }

   725                         sig.append(ch);

   726                     } else {

   727                         hasReturnType[0] = true;

   728                         sig.insert(firstPos, ch);

   729                         if (array) {

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

   731                         }

   732                     }

   733                     array = false;

   734                     continue;

   735                 case 'V':

   736                     assert !count;

   737                     hasReturnType[0] = false;

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

   739                     continue;

   740                 case 'L':

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

   742                     if (count) {

   743                         cnt++;

   744                         if (array) {

   745                             sig.append('A');

   746                         }

   747                         sig.append(ch);

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

   749                     } else {

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

   751                         sig.insert(firstPos, ch);

   752                         if (array) {

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

   754                         }

   755                         hasReturnType[0] = true;

   756                     }

   757                     i = next + 1;

   758                     continue;

   759                 case '[':

   760                     //arrays++;

   761                     continue;

   762                 default:

   763                     break; // invalid character

   764             }

   765         }

   766         return cnt;

   767     }

   769     private void generateStaticField(Variable v) throws IOException {

   770         out.append("\nvar ")

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

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

   773     }

   775     private String findMethodName(Method m) {

   776         StringBuilder name = new StringBuilder();

   777         String descr = m.getDescriptor();

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

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

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

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

   782         } else {

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

   784         }

   786         boolean hasReturn[] = { false };

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

   788         return name.toString();

   789     }

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

   792         StringBuilder name = new StringBuilder();

   793         String descr = mi.getDescriptor();

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

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

   796         } else {

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

   798         }

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

   800         return name.toString();

   801     }

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

   804     throws IOException {

   805         int methodIndex = readIntArg(byteCodes, i);

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

   807         boolean[] hasReturn = { false };

   808         int[] cnt = { 0 };

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

   810         out.append("{ ");

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

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

   813         }

   815         if (hasReturn[0]) {

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

   817         }

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

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

   820         out.append('_');

   821         out.append(mn);

   822         out.append('(');

   823         String sep = "";

   824         if (!isStatic) {

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

   826             sep = ", ";

   827         }

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

   829             out.append(sep);

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

   831             sep = ", ";

   832         }

   833         out.append(")");

   834         if (hasReturn[0]) {

   835             out.append(")");

   836         }

   837         out.append("; }");

   838         i += 2;

   839         addReference(in);

   840         return i;

   841     }

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

   843     throws IOException {

   844         int methodIndex = readIntArg(byteCodes, i);

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

   846         boolean[] hasReturn = { false };

   847         int[] cnt = { 0 };

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

   849         out.append("{ ");

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

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

   852         }

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

   854         if (hasReturn[0]) {

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

   856         }

   857         out.append("self.");

   858         out.append(mn);

   859         out.append('(');

   860         out.append("self");

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

   862             out.append(", ");

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

   864         }

   865         out.append(")");

   866         if (hasReturn[0]) {

   867             out.append(")");

   868         }

   869         out.append("; }");

   870         i += 2;

   871         return i;

   872     }

   874     private void addReference(String cn) {

   875         if (references != null) {

   876             references.add(cn);

   877         }

   878     }

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

   881         int arr = 0;

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

   883             out.append('A');

   884             d = d.substring(1);

   885         }

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

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

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

   889         } else {

   890             out.append(d);

   891         }

   892     }

   894     private String encodeConstant(CPEntry entry) {

   895         final String v;

   896         if (entry instanceof CPClassInfo) {

   897             v = "new java_lang_Class";

   898         } else if (entry instanceof CPStringInfo) {

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

   900         } else {

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

   902         }

   903         return v;

   904     }

   906     private String findDescriptor(String d) {

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

   908     }

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

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

   912         Annotation a = m.getAnnotation(extraAnn);

   913         if (a != null) {

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

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

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

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

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

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

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

   922             }

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

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

   925             out.append("(");

   926             String space;

   927             int index;

   928             if (!isStatic) {

   929                 out.append(names[0]);

   930                 space = ",";

   931                 index = 1;

   932             } else {

   933                 space = "";

   934                 index = 0;

   935             }

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

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

   938                 out.append(space);

   939                 out.append(names[index]);

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

   941                 index++;

   942             }

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

   944             out.append(body);

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

   946             return true;

   947         }

   948         return false;

   949     }

   950 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Tue, 09 Oct 2012 18:26:23 -0700
branch	emul
changeset 96	519bcc6999c4
parent 94	19497b4312bb
child 97	437df2a719e7
permissions	-rw-r--r--