hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@19497b4312bb

     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(");

   216             out.append(Integer.toString(code.getMaxStack()));

   217             out.append(");\n");

   218             produceCode(code.getByteCodes());

   219         } else {

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

   221         }

   222         out.append("}");

   223     }

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

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

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

   228             int prev = i;

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

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

   231             switch (c) {

   232                 case bc_aload_0:

   233                 case bc_iload_0:

   234                 case bc_lload_0:

   235                 case bc_fload_0:

   236                 case bc_dload_0:

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

   238                     break;

   239                 case bc_aload_1:

   240                 case bc_iload_1:

   241                 case bc_lload_1:

   242                 case bc_fload_1:

   243                 case bc_dload_1:

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

   245                     break;

   246                 case bc_aload_2:

   247                 case bc_iload_2:

   248                 case bc_lload_2:

   249                 case bc_fload_2:

   250                 case bc_dload_2:

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

   252                     break;

   253                 case bc_aload_3:

   254                 case bc_iload_3:

   255                 case bc_lload_3:

   256                 case bc_fload_3:

   257                 case bc_dload_3:

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

   259                     break;

   260                 case bc_iload:

   261                 case bc_lload:

   262                 case bc_fload:

   263                 case bc_dload:

   264                 case bc_aload: {

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

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

   267                     break;

   268                 }

   269                 case bc_istore:

   270                 case bc_lstore:

   271                 case bc_fstore:

   272                 case bc_dstore:

   273                 case bc_astore: {

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

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

   276                     break;

   277                 }

   278                 case bc_astore_0:

   279                 case bc_istore_0:

   280                 case bc_lstore_0:

   281                 case bc_fstore_0:

   282                 case bc_dstore_0:

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

   284                     break;

   285                 case bc_astore_1:

   286                 case bc_istore_1:

   287                 case bc_lstore_1:

   288                 case bc_fstore_1:

   289                 case bc_dstore_1:

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

   291                     break;

   292                 case bc_astore_2:

   293                 case bc_istore_2:

   294                 case bc_lstore_2:

   295                 case bc_fstore_2:

   296                 case bc_dstore_2:

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

   298                     break;

   299                 case bc_astore_3:

   300                 case bc_istore_3:

   301                 case bc_lstore_3:

   302                 case bc_fstore_3:

   303                 case bc_dstore_3:

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

   305                     break;

   306                 case bc_iadd:

   307                 case bc_ladd:

   308                 case bc_fadd:

   309                 case bc_dadd:

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

   311                     break;

   312                 case bc_isub:

   313                 case bc_lsub:

   314                 case bc_fsub:

   315                 case bc_dsub:

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

   317                     break;

   318                 case bc_imul:

   319                 case bc_lmul:

   320                 case bc_fmul:

   321                 case bc_dmul:

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

   323                     break;

   324                 case bc_idiv:

   325                 case bc_ldiv:

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

   327                     break;

   328                 case bc_fdiv:

   329                 case bc_ddiv:

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

   331                     break;

   332                 case bc_iand:

   333                 case bc_land:

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

   335                     break;

   336                 case bc_ior:

   337                 case bc_lor:

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

   339                     break;

   340                 case bc_ixor:

   341                 case bc_lxor:

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

   343                     break;

   344                 case bc_ineg:

   345                 case bc_lneg:

   346                 case bc_fneg:

   347                 case bc_dneg:

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

   349                     break;

   350                 case bc_ishl:

   351                 case bc_lshl:

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

   353                     break;

   354                 case bc_ishr:

   355                 case bc_lshr:

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

   357                     break;

   358                 case bc_iushr:

   359                 case bc_lushr:

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

   361                     break;

   362                 case bc_iinc: {

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

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

   365                     if (incrBy == 1) {

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

   367                     } else {

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

   369                     }

   370                     break;

   371                 }

   372                 case bc_return:

   373                     out.append("return;");

   374                     break;

   375                 case bc_ireturn:

   376                 case bc_lreturn:

   377                 case bc_freturn:

   378                 case bc_dreturn:

   379                 case bc_areturn:

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

   381                     break;

   382                 case bc_i2l:

   383                 case bc_i2f:

   384                 case bc_i2d:

   385                 case bc_l2i:

   386                     // max int check?

   387                 case bc_l2f:

   388                 case bc_l2d:

   389                 case bc_f2d:

   390                 case bc_d2f:

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

   392                     break;

   393                 case bc_f2i:

   394                 case bc_f2l:

   395                 case bc_d2i:

   396                 case bc_d2l:

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

   398                     break;

   399                 case bc_i2b:

   400                 case bc_i2c:

   401                 case bc_i2s:

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

   403                     break;

   404                 case bc_aconst_null:

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

   406                     break;

   407                 case bc_iconst_m1:

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

   409                     break;

   410                 case bc_iconst_0:

   411                 case bc_dconst_0:

   412                 case bc_lconst_0:

   413                 case bc_fconst_0:

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

   415                     break;

   416                 case bc_iconst_1:

   417                 case bc_lconst_1:

   418                 case bc_fconst_1:

   419                 case bc_dconst_1:

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

   421                     break;

   422                 case bc_iconst_2:

   423                 case bc_fconst_2:

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

   425                     break;

   426                 case bc_iconst_3:

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

   428                     break;

   429                 case bc_iconst_4:

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

   431                     break;

   432                 case bc_iconst_5:

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

   434                     break;

   435                 case bc_ldc: {

   436                     int indx = byteCodes[++i];

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

   438                     String v = encodeConstant(entry);

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

   440                     break;

   441                 }

   442                 case bc_ldc_w:

   443                 case bc_ldc2_w: {

   444                     int indx = readIntArg(byteCodes, i);

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

   446                     i += 2;

   447                     String v = encodeConstant(entry);

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

   449                     break;

   450                 }

   451                 case bc_lcmp:

   452                 case bc_fcmpl:

   453                 case bc_fcmpg:

   454                 case bc_dcmpl:

   455                 case bc_dcmpg: {

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

   457                     break;

   458                 }

   459                 case bc_if_icmpeq: {

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

   461                     break;

   462                 }

   463                 case bc_ifeq: {

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

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

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

   467                     i += 2;

   468                     break;

   469                 }

   470                 case bc_ifne: {

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

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

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

   474                     i += 2;

   475                     break;

   476                 }

   477                 case bc_iflt: {

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

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

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

   481                     i += 2;

   482                     break;

   483                 }

   484                 case bc_ifle: {

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

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

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

   488                     i += 2;

   489                     break;

   490                 }

   491                 case bc_ifgt: {

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

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

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

   495                     i += 2;

   496                     break;

   497                 }

   498                 case bc_ifge: {

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

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

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

   502                     i += 2;

   503                     break;

   504                 }

   505                 case bc_ifnonnull: {

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

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

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

   509                     i += 2;

   510                     break;

   511                 }

   512                 case bc_ifnull: {

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

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

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

   516                     i += 2;

   517                     break;

   518                 }

   519                 case bc_if_icmpne:

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

   521                     break;

   522                 case bc_if_icmplt:

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

   524                     break;

   525                 case bc_if_icmple:

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

   527                     break;

   528                 case bc_if_icmpgt:

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

   530                     break;

   531                 case bc_if_icmpge:

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

   533                     break;

   534                 case bc_goto: {

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

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

   537                     i += 2;

   538                     break;

   539                 }

   540                 case bc_invokeinterface: {

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

   542                     break;

   543                 }

   544                 case bc_invokevirtual:

   545                     i = invokeVirtualMethod(byteCodes, i);

   546                     break;

   547                 case bc_invokespecial:

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

   549                     break;

   550                 case bc_invokestatic:

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

   552                     break;

   553                 case bc_new: {

   554                     int indx = readIntArg(byteCodes, i);

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

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

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

   558                     out.append(");");

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

   560                     i += 2;

   561                     break;

   562                 }

   563                 case bc_newarray: {

   564                     int type = byteCodes[i++];

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

   566                     break;

   567                 }

   568                 case bc_anewarray: {

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

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

   571                     break;

   572                 }

   573                 case bc_arraylength:

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

   575                     break;

   576                 case bc_iastore:

   577                 case bc_lastore:

   578                 case bc_fastore:

   579                 case bc_dastore:

   580                 case bc_aastore:

   581                 case bc_bastore:

   582                 case bc_castore:

   583                 case bc_sastore: {

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

   585                     break;

   586                 }

   587                 case bc_iaload:

   588                 case bc_laload:

   589                 case bc_faload:

   590                 case bc_daload:

   591                 case bc_aaload:

   592                 case bc_baload:

   593                 case bc_caload:

   594                 case bc_saload: {

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

   596                     break;

   597                 }

   598                 case bc_pop2:

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

   600                 case bc_pop:

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

   602                     break;

   603                 case bc_dup:

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

   605                     break;

   606                 case bc_bipush:

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

   608                     break;

   609                 case bc_sipush:

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

   611                     i += 2;

   612                     break;

   613                 case bc_getfield: {

   614                     int indx = readIntArg(byteCodes, i);

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

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

   617                     i += 2;

   618                     break;

   619                 }

   620                 case bc_getstatic: {

   621                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   626                     i += 2;

   627                     addReference(in);

   628                     break;

   629                 }

   630                 case bc_putstatic: {

   631                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   636                     i += 2;

   637                     addReference(in);

   638                     break;

   639                 }

   640                 case bc_putfield: {

   641                     int indx = readIntArg(byteCodes, i);

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

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

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

   645                     i += 2;

   646                     break;

   647                 }

   648                 case bc_checkcast: {

   649                     int indx = readIntArg(byteCodes, i);

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

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

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

   653                         // no way to check arrays right now

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

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

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

   657                     }

   658                     i += 2;

   659                     break;

   660                 }

   661                 case bc_instanceof: {

   662                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   667                     i += 2;

   668                     break;

   669                 }

   671             }

   672             out.append(" //");

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

   674                 out.append(" ");

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

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

   677             }

   678             out.append("\n");

   679         }

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

   681     }

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

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

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

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

   687         return i + 2;

   688     }

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

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

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

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

   694     }

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

   697         int cnt = 0;

   698         int i = 0;

   699         Boolean count = null;

   700         boolean array = false;

   701         int firstPos = sig.length();

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

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

   704             switch (ch) {

   705                 case '(':

   706                     count = true;

   707                     continue;

   708                 case ')':

   709                     count = false;

   710                     continue;

   711                 case 'A':

   712                     array = true;

   713                     break;

   714                 case 'B':

   715                 case 'C':

   716                 case 'D':

   717                 case 'F':

   718                 case 'I':

   719                 case 'J':

   720                 case 'S':

   721                 case 'Z':

   722                     if (count) {

   723                         cnt++;

   724                         if (array) {

   725                             sig.append('A');

   726                         }

   727                         sig.append(ch);

   728                     } else {

   729                         hasReturnType[0] = true;

   730                         sig.insert(firstPos, ch);

   731                         if (array) {

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

   733                         }

   734                     }

   735                     array = false;

   736                     continue;

   737                 case 'V':

   738                     assert !count;

   739                     hasReturnType[0] = false;

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

   741                     continue;

   742                 case 'L':

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

   744                     if (count) {

   745                         cnt++;

   746                         if (array) {

   747                             sig.append('A');

   748                         }

   749                         sig.append(ch);

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

   751                     } else {

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

   753                         sig.insert(firstPos, ch);

   754                         if (array) {

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

   756                         }

   757                         hasReturnType[0] = true;

   758                     }

   759                     i = next + 1;

   760                     continue;

   761                 case '[':

   762                     //arrays++;

   763                     continue;

   764                 default:

   765                     break; // invalid character

   766             }

   767         }

   768         return cnt;

   769     }

   771     private void generateStaticField(Variable v) throws IOException {

   772         out.append("\nvar ")

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

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

   775     }

   777     private String findMethodName(Method m) {

   778         StringBuilder name = new StringBuilder();

   779         String descr = m.getDescriptor();

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

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

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

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

   784         } else {

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

   786         }

   788         boolean hasReturn[] = { false };

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

   790         return name.toString();

   791     }

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

   794         StringBuilder name = new StringBuilder();

   795         String descr = mi.getDescriptor();

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

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

   798         } else {

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

   800         }

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

   802         return name.toString();

   803     }

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

   806     throws IOException {

   807         int methodIndex = readIntArg(byteCodes, i);

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

   809         boolean[] hasReturn = { false };

   810         int[] cnt = { 0 };

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

   812         out.append("{ ");

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

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

   815         }

   817         if (hasReturn[0]) {

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

   819         }

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

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

   822         out.append('_');

   823         out.append(mn);

   824         out.append('(');

   825         String sep = "";

   826         if (!isStatic) {

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

   828             sep = ", ";

   829         }

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

   831             out.append(sep);

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

   833             sep = ", ";

   834         }

   835         out.append(")");

   836         if (hasReturn[0]) {

   837             out.append(")");

   838         }

   839         out.append("; }");

   840         i += 2;

   841         addReference(in);

   842         return i;

   843     }

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

   845     throws IOException {

   846         int methodIndex = readIntArg(byteCodes, i);

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

   848         boolean[] hasReturn = { false };

   849         int[] cnt = { 0 };

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

   851         out.append("{ ");

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

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

   854         }

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

   856         if (hasReturn[0]) {

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

   858         }

   859         out.append("self.");

   860         out.append(mn);

   861         out.append('(');

   862         out.append("self");

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

   864             out.append(", ");

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

   866         }

   867         out.append(")");

   868         if (hasReturn[0]) {

   869             out.append(")");

   870         }

   871         out.append("; }");

   872         i += 2;

   873         return i;

   874     }

   876     private void addReference(String cn) {

   877         if (references != null) {

   878             references.add(cn);

   879         }

   880     }

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

   883         int arr = 0;

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

   885             out.append('A');

   886             d = d.substring(1);

   887         }

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

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

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

   891         } else {

   892             out.append(d);

   893         }

   894     }

   896     private String encodeConstant(CPEntry entry) {

   897         final String v;

   898         if (entry instanceof CPClassInfo) {

   899             v = "new java_lang_Class";

   900         } else if (entry instanceof CPStringInfo) {

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

   902         } else {

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

   904         }

   905         return v;

   906     }

   908     private String findDescriptor(String d) {

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

   910     }

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

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

   914         Annotation a = m.getAnnotation(extraAnn);

   915         if (a != null) {

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

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

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

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

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

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

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

   924             }

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

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

   927             out.append("(");

   928             String space;

   929             int index;

   930             if (!isStatic) {

   931                 out.append(names[0]);

   932                 space = ",";

   933                 index = 1;

   934             } else {

   935                 space = "";

   936                 index = 0;

   937             }

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

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

   940                 out.append(space);

   941                 out.append(names[index]);

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

   943                 index++;

   944             }

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

   946             out.append(body);

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

   948             return true;

   949         }

   950         return false;

   951     }

   952 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Tue, 09 Oct 2012 11:11:58 -0700
branch	emul
changeset 94	19497b4312bb
parent 93	a236a9f137ac
child 96	519bcc6999c4
permissions	-rw-r--r--