hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@f36b3c273de6

     1 /**

     2  * Back 2 Browser Bytecode Translator

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

     4  *

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

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

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

     8  *

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

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

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

    12  * GNU General Public License for more details.

    13  *

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

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

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

    17  */

    18 package org.apidesign.vm4brwsr;

    20 import java.io.IOException;

    21 import java.io.InputStream;

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

    23 import org.apidesign.javap.AnnotationParser;

    24 import org.apidesign.javap.ClassData;

    25 import org.apidesign.javap.FieldData;

    26 import org.apidesign.javap.MethodData;

    27 import static org.apidesign.javap.RuntimeConstants.*;

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

    30  *

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

    32  */

    33 abstract class ByteCodeToJavaScript {

    34     private ClassData jc;

    35     final Appendable out;

    37     protected ByteCodeToJavaScript(Appendable out) {

    38         this.out = out;

    39     }

    41     /* Collects additional required resources.

    42      *

    43      * @param internalClassName classes that were referenced and should be loaded in order the

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

    45      *   JVM form so String is <code>java/lang/String</code>.

    46      */

    47     protected abstract boolean requireReference(String internalClassName);

    49     /*

    50      * @param resourcePath name of resources to read

    51      */

    52     protected abstract void requireScript(String resourcePath);

    54     /** Allows subclasses to redefine what field a function representing a

    55      * class gets assigned. By default it returns the suggested name followed

    56      * by <code>" = "</code>;

    57      *

    58      * @param className suggested name of the class

    59      */

    60     /* protected */ String assignClass(String className) {

    61         return className + " = ";

    62     }

    63     /* protected */ String accessClass(String classOperation) {

    64         return classOperation;

    65     }

    67     /**

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

    69      *

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

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

    72      *

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

    74      */

    76     public String compile(InputStream classFile) throws IOException {

    77         this.jc = new ClassData(classFile);

    78         byte[] arrData = jc.findAnnotationData(true);

    79         String[] arr = findAnnotation(arrData, jc,

    80             "org.apidesign.bck2brwsr.core.ExtraJavaScript",

    81             "resource", "processByteCode"

    82         );

    83         if (arr != null) {

    84             requireScript(arr[0]);

    85             if ("0".equals(arr[1])) {

    86                 return null;

    87             }

    88         }

    89         String[] proto = findAnnotation(arrData, jc,

    90             "org.apidesign.bck2brwsr.core.JavaScriptPrototype",

    91             "container", "prototype"

    92         );

    93         StringArray toInitilize = new StringArray();

    94         final String className = className(jc);

    95         out.append("\n\n").append(assignClass(className));

    96         out.append("function CLS() {");

    97         out.append("\n  if (!CLS.prototype.$instOf_").append(className).append(") {");

    98         for (FieldData v : jc.getFields()) {

    99             if (v.isStatic()) {

   100                 out.append("\n  CLS.").append(v.getName()).append(initField(v));

   101             }

   102         }

   103         if (proto == null) {

   104             String sc = jc.getSuperClassName(); // with _

   105             out.append("\n    var pp = ").

   106                 append(accessClass(sc.replace('/', '_'))).append("(true);");

   107             out.append("\n    var p = CLS.prototype = pp;");

   108             out.append("\n    var c = p;");

   109             out.append("\n    var sprcls = pp.constructor.$class;");

   110         } else {

   111             out.append("\n    var p = CLS.prototype = ").append(proto[1]).append(";");

   112             out.append("\n    var c = ").append(proto[0]).append(";");

   113             out.append("\n    var sprcls = null;");

   114         }

   115         for (MethodData m : jc.getMethods()) {

   116             byte[] onlyArr = m.findAnnotationData(true);

   117             String[] only = findAnnotation(onlyArr, jc,

   118                 "org.apidesign.bck2brwsr.core.JavaScriptOnly",

   119                 "name", "value"

   120             );

   121             if (only != null) {

   122                 if (only[0] != null && only[1] != null) {

   123                     out.append("\n    p.").append(only[0]).append(" = ")

   124                         .append(only[1]).append(";");

   125                 }

   126                 continue;

   127             }

   128             String mn;

   129             if (m.isStatic()) {

   130                 mn = generateStaticMethod("\n    c.", m, toInitilize);

   131             } else {

   132                 mn = generateInstanceMethod("\n    c.", m);

   133             }

   134             byte[] runAnno = m.findAnnotationData(false);

   135             if (runAnno != null) {

   136                 out.append("\n    c.").append(mn).append(".anno = {");

   137                 generateAnno(jc, out, runAnno);

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

   139             }

   140         }

   141         out.append("\n    c.constructor = CLS;");

   142         out.append("\n    c.$instOf_").append(className).append(" = true;");

   143         for (String superInterface : jc.getSuperInterfaces()) {

   144             out.append("\n    c.$instOf_").append(superInterface.replace('/', '_')).append(" = true;");

   145         }

   146         out.append("\n    CLS.$class = ");

   147         out.append(accessClass("java_lang_Class(true);"));

   148         out.append("\n    CLS.$class.jvmName = '").append(jc.getClassName()).append("';");

   149         out.append("\n    CLS.$class.superclass = sprcls;");

   150         out.append("\n    CLS.$class.cnstr = CLS;");

   151         byte[] classAnno = jc.findAnnotationData(false);

   152         if (classAnno != null) {

   153             out.append("\n    CLS.$class.anno = {");

   154             generateAnno(jc, out, classAnno);

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

   156         }

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

   158         out.append("\n  if (arguments.length === 0) {");

   159         out.append("\n    if (!(this instanceof CLS)) {");

   160         out.append("\n      return new CLS();");

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

   162         for (FieldData v : jc.getFields()) {

   163             byte[] onlyArr = v.findAnnotationData(true);

   164             String[] only = findAnnotation(onlyArr, jc,

   165                 "org.apidesign.bck2brwsr.core.JavaScriptOnly",

   166                 "name", "value"

   167             );

   168             if (only != null) {

   169                 if (only[0] != null && only[1] != null) {

   170                     out.append("\n    p.").append(only[0]).append(" = ")

   171                         .append(only[1]).append(";");

   172                 }

   173                 continue;

   174             }

   175             if (!v.isStatic()) {

   176                 out.append("\n    this.fld_").

   177                     append(v.getName()).append(initField(v));

   178             }

   179         }

   180         out.append("\n    return this;");

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

   182         out.append("\n  return arguments[0] ? new CLS() : CLS.prototype;");

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

   184         StringBuilder sb = new StringBuilder();

   185         for (String init : toInitilize.toArray()) {

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

   187         }

   188         return sb.toString();

   189     }

   190     private String generateStaticMethod(String prefix, MethodData m, StringArray toInitilize) throws IOException {

   191         String jsb = javaScriptBody(prefix, m, true);

   192         if (jsb != null) {

   193             return jsb;

   194         }

   195         StringBuilder argsCnt = new StringBuilder();

   196         final String mn = findMethodName(m, argsCnt);

   197         out.append(prefix).append(mn).append(" = function");

   198         if (mn.equals("class__V")) {

   199             toInitilize.add(accessClass(className(jc)) + "(false)." + mn);

   200         }

   201         out.append('(');

   202         String space = "";

   203         for (int index = 0, i = 0; i < argsCnt.length(); i++) {

   204             out.append(space);

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

   206             space = ",";

   207             final String desc = null;// XXX findDescriptor(args.get(i).getDescriptor());

   208             if (argsCnt.charAt(i) == '1') {

   209                 index += 2;

   210             } else {

   211                 index++;

   212             }

   213         }

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

   215         final byte[] code = m.getCode();

   216         if (code != null) {

   217             int len = m.getMaxLocals();

   218             for (int index = argsCnt.length(), i = argsCnt.length(); i < len; i++) {

   219                 out.append("  var ");

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

   221             }

   222             out.append("  var s = new Array();\n");

   223             produceCode(code);

   224         } else {

   225             out.append("  throw 'no code found for ").append(m.getInternalSig()).append("';\n");

   226         }

   227         out.append("};");

   228         return mn;

   229     }

   231     private String generateInstanceMethod(String prefix, MethodData m) throws IOException {

   232         String jsb = javaScriptBody(prefix, m, false);

   233         if (jsb != null) {

   234             return jsb;

   235         }

   236         StringBuilder argsCnt = new StringBuilder();

   237         final String mn = findMethodName(m, argsCnt);

   238         out.append(prefix).append(mn).append(" = function");

   239         out.append("(arg0");

   240         String space = ",";

   241         for (int index = 1, i = 0; i < argsCnt.length(); i++) {

   242             out.append(space);

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

   244             if (argsCnt.charAt(i) == '1') {

   245                 index += 2;

   246             } else {

   247                 index++;

   248             }

   249         }

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

   251         final byte[] code = m.getCode();

   252         if (code != null) {

   253             int len = m.getMaxLocals();

   254             for (int index = argsCnt.length(), i = argsCnt.length(); i < len; i++) {

   255                 out.append("  var ");

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

   257             }

   258             out.append(";\n  var s = new Array();\n");

   259             produceCode(code);

   260         } else {

   261             out.append("  throw 'no code found for ").append(m.getInternalSig()).append("';\n");

   262         }

   263         out.append("};");

   264         return mn;

   265     }

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

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

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

   270             int prev = i;

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

   272             final int c = readByte(byteCodes, i);

   273             switch (c) {

   274                 case opc_aload_0:

   275                 case opc_iload_0:

   276                 case opc_lload_0:

   277                 case opc_fload_0:

   278                 case opc_dload_0:

   279                     out.append("s.push(arg0);");

   280                     break;

   281                 case opc_aload_1:

   282                 case opc_iload_1:

   283                 case opc_lload_1:

   284                 case opc_fload_1:

   285                 case opc_dload_1:

   286                     out.append("s.push(arg1);");

   287                     break;

   288                 case opc_aload_2:

   289                 case opc_iload_2:

   290                 case opc_lload_2:

   291                 case opc_fload_2:

   292                 case opc_dload_2:

   293                     out.append("s.push(arg2);");

   294                     break;

   295                 case opc_aload_3:

   296                 case opc_iload_3:

   297                 case opc_lload_3:

   298                 case opc_fload_3:

   299                 case opc_dload_3:

   300                     out.append("s.push(arg3);");

   301                     break;

   302                 case opc_iload:

   303                 case opc_lload:

   304                 case opc_fload:

   305                 case opc_dload:

   306                 case opc_aload: {

   307                     final int indx = readByte(byteCodes, ++i);

   308                     out.append("s.push(arg").append(indx + ");");

   309                     break;

   310                 }

   311                 case opc_istore:

   312                 case opc_lstore:

   313                 case opc_fstore:

   314                 case opc_dstore:

   315                 case opc_astore: {

   316                     final int indx = readByte(byteCodes, ++i);

   317                     out.append("arg" + indx).append(" = s.pop();");

   318                     break;

   319                 }

   320                 case opc_astore_0:

   321                 case opc_istore_0:

   322                 case opc_lstore_0:

   323                 case opc_fstore_0:

   324                 case opc_dstore_0:

   325                     out.append("arg0 = s.pop();");

   326                     break;

   327                 case opc_astore_1:

   328                 case opc_istore_1:

   329                 case opc_lstore_1:

   330                 case opc_fstore_1:

   331                 case opc_dstore_1:

   332                     out.append("arg1 = s.pop();");

   333                     break;

   334                 case opc_astore_2:

   335                 case opc_istore_2:

   336                 case opc_lstore_2:

   337                 case opc_fstore_2:

   338                 case opc_dstore_2:

   339                     out.append("arg2 = s.pop();");

   340                     break;

   341                 case opc_astore_3:

   342                 case opc_istore_3:

   343                 case opc_lstore_3:

   344                 case opc_fstore_3:

   345                 case opc_dstore_3:

   346                     out.append("arg3 = s.pop();");

   347                     break;

   348                 case opc_iadd:

   349                 case opc_ladd:

   350                 case opc_fadd:

   351                 case opc_dadd:

   352                     out.append("s.push(s.pop() + s.pop());");

   353                     break;

   354                 case opc_isub:

   355                 case opc_lsub:

   356                 case opc_fsub:

   357                 case opc_dsub:

   358                     out.append("{ var tmp = s.pop(); s.push(s.pop() - tmp); }");

   359                     break;

   360                 case opc_imul:

   361                 case opc_lmul:

   362                 case opc_fmul:

   363                 case opc_dmul:

   364                     out.append("s.push(s.pop() * s.pop());");

   365                     break;

   366                 case opc_idiv:

   367                 case opc_ldiv:

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

   369                     break;

   370                 case opc_fdiv:

   371                 case opc_ddiv:

   372                     out.append("{ var tmp = s.pop(); s.push(s.pop() / tmp); }");

   373                     break;

   374                 case opc_irem:

   375                 case opc_lrem:

   376                 case opc_frem:

   377                 case opc_drem:

   378                     out.append("{ var d = s.pop(); s.push(s.pop() % d); }");

   379                     break;

   380                 case opc_iand:

   381                 case opc_land:

   382                     out.append("s.push(s.pop() & s.pop());");

   383                     break;

   384                 case opc_ior:

   385                 case opc_lor:

   386                     out.append("s.push(s.pop() | s.pop());");

   387                     break;

   388                 case opc_ixor:

   389                 case opc_lxor:

   390                     out.append("s.push(s.pop() ^ s.pop());");

   391                     break;

   392                 case opc_ineg:

   393                 case opc_lneg:

   394                 case opc_fneg:

   395                 case opc_dneg:

   396                     out.append("s.push(- s.pop());");

   397                     break;

   398                 case opc_ishl:

   399                 case opc_lshl:

   400                     out.append("{ var v = s.pop(); s.push(s.pop() << v); }");

   401                     break;

   402                 case opc_ishr:

   403                 case opc_lshr:

   404                     out.append("{ var v = s.pop(); s.push(s.pop() >> v); }");

   405                     break;

   406                 case opc_iushr:

   407                 case opc_lushr:

   408                     out.append("{ var v = s.pop(); s.push(s.pop() >>> v); }");

   409                     break;

   410                 case opc_iinc: {

   411                     final int varIndx = readByte(byteCodes, ++i);

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

   413                     if (incrBy == 1) {

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

   415                     } else {

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

   417                     }

   418                     break;

   419                 }

   420                 case opc_return:

   421                     out.append("return;");

   422                     break;

   423                 case opc_ireturn:

   424                 case opc_lreturn:

   425                 case opc_freturn:

   426                 case opc_dreturn:

   427                 case opc_areturn:

   428                     out.append("return s.pop();");

   429                     break;

   430                 case opc_i2l:

   431                 case opc_i2f:

   432                 case opc_i2d:

   433                 case opc_l2i:

   434                     // max int check?

   435                 case opc_l2f:

   436                 case opc_l2d:

   437                 case opc_f2d:

   438                 case opc_d2f:

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

   440                     break;

   441                 case opc_f2i:

   442                 case opc_f2l:

   443                 case opc_d2i:

   444                 case opc_d2l:

   445                     out.append("s.push(Math.floor(s.pop()));");

   446                     break;

   447                 case opc_i2b:

   448                 case opc_i2c:

   449                 case opc_i2s:

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

   451                     break;

   452                 case opc_aconst_null:

   453                     out.append("s.push(null);");

   454                     break;

   455                 case opc_iconst_m1:

   456                     out.append("s.push(-1);");

   457                     break;

   458                 case opc_iconst_0:

   459                 case opc_dconst_0:

   460                 case opc_lconst_0:

   461                 case opc_fconst_0:

   462                     out.append("s.push(0);");

   463                     break;

   464                 case opc_iconst_1:

   465                 case opc_lconst_1:

   466                 case opc_fconst_1:

   467                 case opc_dconst_1:

   468                     out.append("s.push(1);");

   469                     break;

   470                 case opc_iconst_2:

   471                 case opc_fconst_2:

   472                     out.append("s.push(2);");

   473                     break;

   474                 case opc_iconst_3:

   475                     out.append("s.push(3);");

   476                     break;

   477                 case opc_iconst_4:

   478                     out.append("s.push(4);");

   479                     break;

   480                 case opc_iconst_5:

   481                     out.append("s.push(5);");

   482                     break;

   483                 case opc_ldc: {

   484                     int indx = readByte(byteCodes, ++i);

   485                     String v = encodeConstant(indx);

   486                     out.append("s.push(").append(v).append(");");

   487                     break;

   488                 }

   489                 case opc_ldc_w:

   490                 case opc_ldc2_w: {

   491                     int indx = readIntArg(byteCodes, i);

   492                     i += 2;

   493                     String v = encodeConstant(indx);

   494                     out.append("s.push(").append(v).append(");");

   495                     break;

   496                 }

   497                 case opc_lcmp:

   498                 case opc_fcmpl:

   499                 case opc_fcmpg:

   500                 case opc_dcmpl:

   501                 case opc_dcmpg: {

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

   503                     break;

   504                 }

   505                 case opc_if_acmpeq:

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

   507                     break;

   508                 case opc_if_acmpne:

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

   510                     break;

   511                 case opc_if_icmpeq: {

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

   513                     break;

   514                 }

   515                 case opc_ifeq: {

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

   517                     out.append("if (s.pop() == 0) { gt = " + indx);

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

   519                     i += 2;

   520                     break;

   521                 }

   522                 case opc_ifne: {

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

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

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

   526                     i += 2;

   527                     break;

   528                 }

   529                 case opc_iflt: {

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

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

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

   533                     i += 2;

   534                     break;

   535                 }

   536                 case opc_ifle: {

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

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

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

   540                     i += 2;

   541                     break;

   542                 }

   543                 case opc_ifgt: {

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

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

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

   547                     i += 2;

   548                     break;

   549                 }

   550                 case opc_ifge: {

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

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

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

   554                     i += 2;

   555                     break;

   556                 }

   557                 case opc_ifnonnull: {

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

   559                     out.append("if (s.pop() !== null) { gt = " + indx);

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

   561                     i += 2;

   562                     break;

   563                 }

   564                 case opc_ifnull: {

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

   566                     out.append("if (s.pop() === null) { gt = " + indx);

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

   568                     i += 2;

   569                     break;

   570                 }

   571                 case opc_if_icmpne:

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

   573                     break;

   574                 case opc_if_icmplt:

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

   576                     break;

   577                 case opc_if_icmple:

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

   579                     break;

   580                 case opc_if_icmpgt:

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

   582                     break;

   583                 case opc_if_icmpge:

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

   585                     break;

   586                 case opc_goto: {

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

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

   589                     i += 2;

   590                     break;

   591                 }

   592                 case opc_lookupswitch: {

   593                     int table = i / 4 * 4 + 4;

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

   595                     table += 4;

   596                     int n = readInt4(byteCodes, table);

   597                     table += 4;

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

   599                     while (n-- > 0) {

   600                         int cnstnt = readInt4(byteCodes, table);

   601                         table += 4;

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

   603                         table += 4;

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

   605                     }

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

   607                     i = table - 1;

   608                     break;

   609                 }

   610                 case opc_tableswitch: {

   611                     int table = i / 4 * 4 + 4;

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

   613                     table += 4;

   614                     int low = readInt4(byteCodes, table);

   615                     table += 4;

   616                     int high = readInt4(byteCodes, table);

   617                     table += 4;

   618                     out.append("switch (s.pop()) {\n");

   619                     while (low <= high) {

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

   621                         table += 4;

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

   623                         low++;

   624                     }

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

   626                     i = table - 1;

   627                     break;

   628                 }

   629                 case opc_invokeinterface: {

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

   631                     break;

   632                 }

   633                 case opc_invokevirtual:

   634                     i = invokeVirtualMethod(byteCodes, i);

   635                     break;

   636                 case opc_invokespecial:

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

   638                     break;

   639                 case opc_invokestatic:

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

   641                     break;

   642                 case opc_new: {

   643                     int indx = readIntArg(byteCodes, i);

   644                     String ci = jc.getClassName(indx);

   645                     out.append("s.push(new ");

   646                     out.append(accessClass(ci.replace('/','_')));

   647                     out.append("());");

   648                     addReference(ci);

   649                     i += 2;

   650                     break;

   651                 }

   652                 case opc_newarray: {

   653                     int type = byteCodes[i++];

   654                     out.append("s.push(new Array(s.pop()).fillNulls());");

   655                     break;

   656                 }

   657                 case opc_anewarray: {

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

   659                     out.append("s.push(new Array(s.pop()).fillNulls());");

   660                     break;

   661                 }

   662                 case opc_multianewarray: {

   663                     i += 2;

   664                     int dim = readByte(byteCodes, ++i);

   665                     out.append("{ var a0 = new Array(s.pop()).fillNulls();");

   666                     for (int d = 1; d < dim; d++) {

   667                         out.append("\n  var l" + d).append(" = s.pop();");

   668                         out.append("\n  for (var i" + d).append (" = 0; i" + d).

   669                             append(" < a" + (d - 1)).

   670                             append(".length; i" + d).append("++) {");

   671                         out.append("\n    var a" + d).

   672                             append (" = new Array(l" + d).append(").fillNulls();");

   673                         out.append("\n    a" + (d - 1)).append("[i" + d).append("] = a" + d).

   674                             append(";");

   675                     }

   676                     for (int d = 1; d < dim; d++) {

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

   678                     }

   679                     out.append("\ns.push(a0); }");

   680                     break;

   681                 }

   682                 case opc_arraylength:

   683                     out.append("s.push(s.pop().length);");

   684                     break;

   685                 case opc_iastore:

   686                 case opc_lastore:

   687                 case opc_fastore:

   688                 case opc_dastore:

   689                 case opc_aastore:

   690                 case opc_bastore:

   691                 case opc_castore:

   692                 case opc_sastore: {

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

   694                     break;

   695                 }

   696                 case opc_iaload:

   697                 case opc_laload:

   698                 case opc_faload:

   699                 case opc_daload:

   700                 case opc_aaload:

   701                 case opc_baload:

   702                 case opc_caload:

   703                 case opc_saload: {

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

   705                     break;

   706                 }

   707                 case opc_pop2:

   708                     out.append("s.pop();");

   709                 case opc_pop:

   710                     out.append("s.pop();");

   711                     break;

   712                 case opc_dup:

   713                     out.append("s.push(s[s.length - 1]);");

   714                     break;

   715                 case opc_dup_x1:

   716                     out.append("{ var v1 = s.pop(); var v2 = s.pop(); s.push(v1); s.push(v2); s.push(v1); }");

   717                     break;

   718                 case opc_dup_x2:

   719                     out.append("{ var v1 = s.pop(); var v2 = s.pop(); var v3 = s.pop(); s.push(v1); s.push(v3); s.push(v2); s.push(v1); }");

   720                     break;

   721                 case opc_bipush:

   722                     out.append("s.push(" + byteCodes[++i] + ");");

   723                     break;

   724                 case opc_sipush:

   725                     out.append("s.push(" + readIntArg(byteCodes, i) + ");");

   726                     i += 2;

   727                     break;

   728                 case opc_getfield: {

   729                     int indx = readIntArg(byteCodes, i);

   730                     String[] fi = jc.getFieldInfoName(indx);

   731                     out.append("s.push(s.pop().fld_").

   732                         append(fi[1]).append(");");

   733                     i += 2;

   734                     break;

   735                 }

   736                 case opc_getstatic: {

   737                     int indx = readIntArg(byteCodes, i);

   738                     String[] fi = jc.getFieldInfoName(indx);

   739                     out.append("s.push(").append(accessClass(fi[0].replace('/', '_')));

   740                     out.append('.').append(fi[1]).append(");");

   741                     i += 2;

   742                     addReference(fi[0]);

   743                     break;

   744                 }

   745                 case opc_putstatic: {

   746                     int indx = readIntArg(byteCodes, i);

   747                     String[] fi = jc.getFieldInfoName(indx);

   748                     out.append(accessClass(fi[0].replace('/', '_')));

   749                     out.append('.').append(fi[1]).append(" = s.pop();");

   750                     i += 2;

   751                     addReference(fi[0]);

   752                     break;

   753                 }

   754                 case opc_putfield: {

   755                     int indx = readIntArg(byteCodes, i);

   756                     String[] fi = jc.getFieldInfoName(indx);

   757                     out.append("{ var v = s.pop(); s.pop().fld_")

   758                        .append(fi[1]).append(" = v; }");

   759                     i += 2;

   760                     break;

   761                 }

   762                 case opc_checkcast: {

   763                     int indx = readIntArg(byteCodes, i);

   764                     final String type = jc.getClassName(indx);

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

   766                         // no way to check arrays right now

   767                         out.append("if(s[s.length - 1] !== null && !s[s.length - 1].$instOf_")

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

   769                            .append(") throw {};"); // XXX proper exception

   770                     }

   771                     i += 2;

   772                     break;

   773                 }

   774                 case opc_instanceof: {

   775                     int indx = readIntArg(byteCodes, i);

   776                     final String type = jc.getClassName(indx);

   777                     out.append("s.push(s.pop().$instOf_")

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

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

   780                     i += 2;

   781                     break;

   782                 }

   783                 case opc_athrow: {

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

   785                     break;

   786                 }

   787                 default: {

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

   789                 }

   791             }

   792             out.append(" //");

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

   794                 out.append(" ");

   795                 final int cc = readByte(byteCodes, j);

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

   797             }

   798             out.append("\n");

   799         }

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

   801     }

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

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

   805         out.append("if (s.pop() ").append(test).append(" s.pop()) { gt = " + indx);

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

   807         return i + 2;

   808     }

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

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

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

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

   814     }

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

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

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

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

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

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

   821     }

   822     private int readByte(byte[] byteCodes, int offsetInstruction) {

   823         return (byteCodes[offsetInstruction] + 256) % 256;

   824     }

   826     private static void countArgs(String descriptor, boolean[] hasReturnType, StringBuilder sig, StringBuilder cnt) {

   827         int i = 0;

   828         Boolean count = null;

   829         boolean array = false;

   830         sig.append("__");

   831         int firstPos = sig.length();

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

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

   834             switch (ch) {

   835                 case '(':

   836                     count = true;

   837                     continue;

   838                 case ')':

   839                     count = false;

   840                     continue;

   841                 case 'B':

   842                 case 'C':

   843                 case 'D':

   844                 case 'F':

   845                 case 'I':

   846                 case 'J':

   847                 case 'S':

   848                 case 'Z':

   849                     if (count) {

   850                         if (array) {

   851                             sig.append("_3");

   852                         }

   853                         sig.append(ch);

   854                         if (ch == 'J' || ch == 'D') {

   855                             cnt.append('1');

   856                         } else {

   857                             cnt.append('0');

   858                         }

   859                     } else {

   860                         hasReturnType[0] = true;

   861                         sig.insert(firstPos, ch);

   862                         if (array) {

   863                             sig.insert(firstPos, "_3");

   864                         }

   865                     }

   866                     array = false;

   867                     continue;

   868                 case 'V':

   869                     assert !count;

   870                     hasReturnType[0] = false;

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

   872                     continue;

   873                 case 'L':

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

   875                     String realSig = mangleSig(descriptor, i - 1, next + 1);

   876                     if (count) {

   877                         if (array) {

   878                             sig.append("_3");

   879                         }

   880                         sig.append(realSig);

   881                         cnt.append('0');

   882                     } else {

   883                         sig.insert(firstPos, realSig);

   884                         if (array) {

   885                             sig.insert(firstPos, "_3");

   886                         }

   887                         hasReturnType[0] = true;

   888                     }

   889                     i = next + 1;

   890                     continue;

   891                 case '[':

   892                     array = true;

   893                     continue;

   894                 default:

   895                     throw new IllegalStateException("Invalid char: " + ch);

   896             }

   897         }

   898     }

   900     private static String mangleSig(String txt, int first, int last) {

   901         StringBuilder sb = new StringBuilder();

   902         for (int i = first; i < last; i++) {

   903             final char ch = txt.charAt(i);

   904             switch (ch) {

   905                 case '/': sb.append('_'); break;

   906                 case '_': sb.append("_1"); break;

   907                 case ';': sb.append("_2"); break;

   908                 case '[': sb.append("_3"); break;

   909                 default: sb.append(ch); break;

   910             }

   911         }

   912         return sb.toString();

   913     }

   915     private static String findMethodName(MethodData m, StringBuilder cnt) {

   916         StringBuilder name = new StringBuilder();

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

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

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

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

   921         } else {

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

   923         }

   925         boolean hasReturn[] = { false };

   926         countArgs(m.getInternalSig(), hasReturn, name, cnt);

   927         return name.toString();

   928     }

   930     static String findMethodName(String[] mi, StringBuilder cnt, boolean[] hasReturn) {

   931         StringBuilder name = new StringBuilder();

   932         String descr = mi[2];//mi.getDescriptor();

   933         String nm= mi[1];

   934         if ("<init>".equals(nm)) { // NOI18N

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

   936         } else {

   937             name.append(nm);

   938         }

   939         countArgs(descr, hasReturn, name, cnt);

   940         return name.toString();

   941     }

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

   944     throws IOException {

   945         int methodIndex = readIntArg(byteCodes, i);

   946         String[] mi = jc.getFieldInfoName(methodIndex);

   947         boolean[] hasReturn = { false };

   948         StringBuilder cnt = new StringBuilder();

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

   950         out.append("{ ");

   951         for (int j = cnt.length() - 1; j >= 0; j--) {

   952             out.append("var v" + j).append(" = s.pop(); ");

   953         }

   955         if (hasReturn[0]) {

   956             out.append("s.push(");

   957         }

   958         final String in = mi[0];

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

   960         out.append("(false).");

   961         out.append(mn);

   962         out.append('(');

   963         String sep = "";

   964         if (!isStatic) {

   965             out.append("s.pop()");

   966             sep = ", ";

   967         }

   968         for (int j = 0; j < cnt.length(); j++) {

   969             out.append(sep);

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

   971             sep = ", ";

   972         }

   973         out.append(")");

   974         if (hasReturn[0]) {

   975             out.append(")");

   976         }

   977         out.append("; }");

   978         i += 2;

   979         addReference(in);

   980         return i;

   981     }

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

   983     throws IOException {

   984         int methodIndex = readIntArg(byteCodes, i);

   985         String[] mi = jc.getFieldInfoName(methodIndex);

   986         boolean[] hasReturn = { false };

   987         StringBuilder cnt = new StringBuilder();

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

   989         out.append("{ ");

   990         for (int j = cnt.length() - 1; j >= 0; j--) {

   991             out.append("var v" + j).append(" = s.pop(); ");

   992         }

   993         out.append("var self = s.pop(); ");

   994         if (hasReturn[0]) {

   995             out.append("s.push(");

   996         }

   997         out.append("self.");

   998         out.append(mn);

   999         out.append('(');

  1000         out.append("self");

  1001         for (int j = 0; j < cnt.length(); j++) {

  1002             out.append(", ");

  1003             out.append("v" + j);

  1004         }

  1005         out.append(")");

  1006         if (hasReturn[0]) {

  1007             out.append(")");

  1008         }

  1009         out.append("; }");

  1010         i += 2;

  1011         return i;

  1012     }

  1014     private void addReference(String cn) throws IOException {

  1015         if (requireReference(cn)) {

  1016             out.append(" /* needs ").append(cn).append(" */");

  1017         }

  1018     }

  1020     private void outType(String d, StringBuilder out) {

  1021         int arr = 0;

  1022         while (d.charAt(0) == '[') {

  1023             out.append('A');

  1024             d = d.substring(1);

  1025         }

  1026         if (d.charAt(0) == 'L') {

  1027             assert d.charAt(d.length() - 1) == ';';

  1028             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1029         } else {

  1030             out.append(d);

  1031         }

  1032     }

  1034     private String encodeConstant(int entryIndex) throws IOException {

  1035         String[] classRef = { null };

  1036         String s = jc.stringValue(entryIndex, classRef);

  1037         if (classRef[0] != null) {

  1038             addReference(classRef[0]);

  1039             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1040         }

  1041         return s;

  1042     }

  1044     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1045         byte[] arr = m.findAnnotationData(true);

  1046         if (arr == null) {

  1047             return null;

  1048         }

  1049         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1050         class P extends AnnotationParser {

  1051             public P() {

  1052                 super(false);

  1053             }

  1055             int cnt;

  1056             String[] args = new String[30];

  1057             String body;

  1059             @Override

  1060             protected void visitAttr(String type, String attr, String at, String value) {

  1061                 if (type.equals(jvmType)) {

  1062                     if ("body".equals(attr)) {

  1063                         body = value;

  1064                     } else if ("args".equals(attr)) {

  1065                         args[cnt++] = value;

  1066                     } else {

  1067                         throw new IllegalArgumentException(attr);

  1068                     }

  1069                 }

  1070             }

  1071         }

  1072         P p = new P();

  1073         p.parse(arr, jc);

  1074         if (p.body == null) {

  1075             return null;

  1076         }

  1077         StringBuilder cnt = new StringBuilder();

  1078         final String mn = findMethodName(m, cnt);

  1079         out.append(prefix).append(mn);

  1080         out.append(" = function(");

  1081         String space;

  1082         int index;

  1083         if (!isStatic) {

  1084             out.append(p.args[0]);

  1085             space = ",";

  1086             index = 1;

  1087         } else {

  1088             space = "";

  1089             index = 0;

  1090         }

  1091         for (int i = 0; i < cnt.length(); i++) {

  1092             out.append(space);

  1093             out.append(p.args[index]);

  1094             index++;

  1095             space = ",";

  1096         }

  1097         out.append(") {").append("\n");

  1098         out.append(p.body);

  1099         out.append("\n}\n");

  1100         return mn;

  1101     }

  1102     private static String className(ClassData jc) {

  1103         //return jc.getName().getInternalName().replace('/', '_');

  1104         return jc.getClassName().replace('/', '_');

  1105     }

  1107     private static String[] findAnnotation(

  1108         byte[] arr, ClassData cd, final String className,

  1109         final String... attrNames

  1110     ) throws IOException {

  1111         if (arr == null) {

  1112             return null;

  1113         }

  1114         final String[] values = new String[attrNames.length];

  1115         final boolean[] found = { false };

  1116         final String jvmType = "L" + className.replace('.', '/') + ";";

  1117         AnnotationParser ap = new AnnotationParser(false) {

  1118             @Override

  1119             protected void visitAttr(String type, String attr, String at, String value) {

  1120                 if (type.equals(jvmType)) {

  1121                     found[0] = true;

  1122                     for (int i = 0; i < attrNames.length; i++) {

  1123                         if (attrNames[i].equals(attr)) {

  1124                             values[i] = value;

  1125                         }

  1126                     }

  1127                 }

  1128             }

  1130         };

  1131         ap.parse(arr, cd);

  1132         return found[0] ? values : null;

  1133     }

  1135     private CharSequence initField(FieldData v) {

  1136         final String is = v.getInternalSig();

  1137         if (is.length() == 1) {

  1138             switch (is.charAt(0)) {

  1139                 case 'S':

  1140                 case 'J':

  1141                 case 'B':

  1142                 case 'Z':

  1143                 case 'C':

  1144                 case 'I': return " = 0;";

  1145                 case 'F':

  1146                 case 'D': return " = 0.0;";

  1147                 default:

  1148                     throw new IllegalStateException(is);

  1149             }

  1150         }

  1151         return " = null;";

  1152     }

  1154     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1155         AnnotationParser ap = new AnnotationParser(true) {

  1156             int anno;

  1157             int cnt;

  1159             @Override

  1160             protected void visitAnnotationStart(String type) throws IOException {

  1161                 if (anno++ > 0) {

  1162                     out.append(",");

  1163                 }

  1164                 out.append('"').append(type).append("\" : {\n");

  1165                 cnt = 0;

  1166             }

  1168             @Override

  1169             protected void visitAnnotationEnd(String type) throws IOException {

  1170                 out.append("\n}\n");

  1171             }

  1173             @Override

  1174             protected void visitAttr(String type, String attr, String attrType, String value)

  1175             throws IOException {

  1176                 if (attr == null) {

  1177                     return;

  1178                 }

  1179                 if (cnt++ > 0) {

  1180                     out.append(",\n");

  1181                 }

  1182                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1183             }

  1184         };

  1185         ap.parse(data, cd);

  1186     }

  1187 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Wed, 12 Dec 2012 09:09:42 +0100
changeset 306	f36b3c273de6
parent 291	c6f21b56a6cf
parent 303	c12342170235
child 316	8da329789435
permissions	-rw-r--r--