hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@a2ca83ddc521

     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.javap.AnnotationParser;

    23 import org.apidesign.javap.ClassData;

    24 import org.apidesign.javap.FieldData;

    25 import org.apidesign.javap.MethodData;

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

    27 import org.apidesign.javap.TrapData;

    28 import org.apidesign.javap.TrapDataIterator;

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

    31  *

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

    33  */

    34 public abstract class ByteCodeToJavaScript {

    35     private ClassData jc;

    36     final Appendable out;

    38     protected ByteCodeToJavaScript(Appendable out) {

    39         this.out = out;

    40     }

    42     /* Collects additional required resources.

    43      *

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

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

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

    47      */

    48     protected abstract boolean requireReference(String internalClassName);

    50     /*

    51      * @param resourcePath name of resources to read

    52      */

    53     protected abstract void requireScript(String resourcePath);

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

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

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

    58      *

    59      * @param className suggested name of the class

    60      */

    61     protected String assignClass(String className) {

    62         return className + " = ";

    63     }

    65     /**

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

    67      *

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

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

    70      *

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

    72      */

    74     public String compile(InputStream classFile) throws IOException {

    75         this.jc = new ClassData(classFile);

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

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

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

    79             "resource", "processByteCode"

    80         );

    81         if (arr != null) {

    82             requireScript(arr[0]);

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

    84                 return null;

    85             }

    86         }

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

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

    89             "container", "prototype"

    90         );

    91         StringArray toInitilize = new StringArray();

    92         final String className = className(jc);

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

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

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

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

    97             if (v.isStatic()) {

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

    99             }

   100         }

   101         if (proto == null) {

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

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

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

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

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

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

   108         } else {

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

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

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

   112         }

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

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

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

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

   117                 "name", "value"

   118             );

   119             if (only != null) {

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

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

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

   123                 }

   124                 continue;

   125             }

   126             String mn;

   127             if (m.isStatic()) {

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

   129             } else {

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

   131             }

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

   133             if (runAnno != null) {

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

   135                 generateAnno(jc, out, runAnno);

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

   137             }

   138         }

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

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

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

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

   143         }

   144         out.append("\n    CLS.$class = java_lang_Class(true);");

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

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

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

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

   149         if (classAnno != null) {

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

   151             generateAnno(jc, out, classAnno);

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

   153         }

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

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

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

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

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

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

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

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

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

   163                 "name", "value"

   164             );

   165             if (only != null) {

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

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

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

   169                 }

   170                 continue;

   171             }

   172             if (!v.isStatic()) {

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

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

   175             }

   176         }

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

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

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

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

   181         StringBuilder sb = new StringBuilder();

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

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

   184         }

   185         return sb.toString();

   186     }

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

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

   189         if (jsb != null) {

   190             return jsb;

   191         }

   192         StringBuilder argsCnt = new StringBuilder();

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

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

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

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

   197         }

   198         out.append('(');

   199         String space = "";

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

   201             out.append(space);

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

   203             space = ",";

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

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

   206                 index += 2;

   207             } else {

   208                 index++;

   209             }

   210         }

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

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

   213         if (code != null) {

   214             int len = m.getMaxLocals();

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

   216                 out.append("  var ");

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

   218             }

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

   220             produceCode(m);

   221         } else {

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

   223         }

   224         out.append("};");

   225         return mn;

   226     }

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

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

   230         if (jsb != null) {

   231             return jsb;

   232         }

   233         StringBuilder argsCnt = new StringBuilder();

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

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

   236         out.append("(arg0");

   237         String space = ",";

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

   239             out.append(space);

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

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

   242                 index += 2;

   243             } else {

   244                 index++;

   245             }

   246         }

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

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

   249         if (code != null) {

   250             int len = m.getMaxLocals();

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

   252                 out.append("  var ");

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

   254             }

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

   256             produceCode(m);

   257         } else {

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

   259         }

   260         out.append("};");

   261         return mn;

   262     }

   264     private void produceCode(MethodData md) throws IOException {

   265         byte[] byteCodes = md.getCode();

   267         TrapDataIterator trap = md.getTrapDataIterator();

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

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

   272             trap.advanceTo(i);

   273             int prev = i;

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

   275             if (trap.useTry()) {

   276                 out.append("try {");

   277             }

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

   279             switch (c) {

   280                 case opc_aload_0:

   281                 case opc_iload_0:

   282                 case opc_lload_0:

   283                 case opc_fload_0:

   284                 case opc_dload_0:

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

   286                     break;

   287                 case opc_aload_1:

   288                 case opc_iload_1:

   289                 case opc_lload_1:

   290                 case opc_fload_1:

   291                 case opc_dload_1:

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

   293                     break;

   294                 case opc_aload_2:

   295                 case opc_iload_2:

   296                 case opc_lload_2:

   297                 case opc_fload_2:

   298                 case opc_dload_2:

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

   300                     break;

   301                 case opc_aload_3:

   302                 case opc_iload_3:

   303                 case opc_lload_3:

   304                 case opc_fload_3:

   305                 case opc_dload_3:

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

   307                     break;

   308                 case opc_iload:

   309                 case opc_lload:

   310                 case opc_fload:

   311                 case opc_dload:

   312                 case opc_aload: {

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

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

   315                     break;

   316                 }

   317                 case opc_istore:

   318                 case opc_lstore:

   319                 case opc_fstore:

   320                 case opc_dstore:

   321                 case opc_astore: {

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

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

   324                     break;

   325                 }

   326                 case opc_astore_0:

   327                 case opc_istore_0:

   328                 case opc_lstore_0:

   329                 case opc_fstore_0:

   330                 case opc_dstore_0:

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

   332                     break;

   333                 case opc_astore_1:

   334                 case opc_istore_1:

   335                 case opc_lstore_1:

   336                 case opc_fstore_1:

   337                 case opc_dstore_1:

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

   339                     break;

   340                 case opc_astore_2:

   341                 case opc_istore_2:

   342                 case opc_lstore_2:

   343                 case opc_fstore_2:

   344                 case opc_dstore_2:

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

   346                     break;

   347                 case opc_astore_3:

   348                 case opc_istore_3:

   349                 case opc_lstore_3:

   350                 case opc_fstore_3:

   351                 case opc_dstore_3:

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

   353                     break;

   354                 case opc_iadd:

   355                 case opc_ladd:

   356                 case opc_fadd:

   357                 case opc_dadd:

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

   359                     break;

   360                 case opc_isub:

   361                 case opc_lsub:

   362                 case opc_fsub:

   363                 case opc_dsub:

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

   365                     break;

   366                 case opc_imul:

   367                 case opc_lmul:

   368                 case opc_fmul:

   369                 case opc_dmul:

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

   371                     break;

   372                 case opc_idiv:

   373                 case opc_ldiv:

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

   375                     break;

   376                 case opc_fdiv:

   377                 case opc_ddiv:

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

   379                     break;

   380                 case opc_irem:

   381                 case opc_lrem:

   382                 case opc_frem:

   383                 case opc_drem:

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

   385                     break;

   386                 case opc_iand:

   387                 case opc_land:

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

   389                     break;

   390                 case opc_ior:

   391                 case opc_lor:

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

   393                     break;

   394                 case opc_ixor:

   395                 case opc_lxor:

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

   397                     break;

   398                 case opc_ineg:

   399                 case opc_lneg:

   400                 case opc_fneg:

   401                 case opc_dneg:

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

   403                     break;

   404                 case opc_ishl:

   405                 case opc_lshl:

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

   407                     break;

   408                 case opc_ishr:

   409                 case opc_lshr:

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

   411                     break;

   412                 case opc_iushr:

   413                 case opc_lushr:

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

   415                     break;

   416                 case opc_iinc: {

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

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

   419                     if (incrBy == 1) {

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

   421                     } else {

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

   423                     }

   424                     break;

   425                 }

   426                 case opc_return:

   427                     out.append("return;");

   428                     break;

   429                 case opc_ireturn:

   430                 case opc_lreturn:

   431                 case opc_freturn:

   432                 case opc_dreturn:

   433                 case opc_areturn:

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

   435                     break;

   436                 case opc_i2l:

   437                 case opc_i2f:

   438                 case opc_i2d:

   439                 case opc_l2i:

   440                     // max int check?

   441                 case opc_l2f:

   442                 case opc_l2d:

   443                 case opc_f2d:

   444                 case opc_d2f:

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

   446                     break;

   447                 case opc_f2i:

   448                 case opc_f2l:

   449                 case opc_d2i:

   450                 case opc_d2l:

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

   452                     break;

   453                 case opc_i2b:

   454                 case opc_i2c:

   455                 case opc_i2s:

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

   457                     break;

   458                 case opc_aconst_null:

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

   460                     break;

   461                 case opc_iconst_m1:

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

   463                     break;

   464                 case opc_iconst_0:

   465                 case opc_dconst_0:

   466                 case opc_lconst_0:

   467                 case opc_fconst_0:

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

   469                     break;

   470                 case opc_iconst_1:

   471                 case opc_lconst_1:

   472                 case opc_fconst_1:

   473                 case opc_dconst_1:

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

   475                     break;

   476                 case opc_iconst_2:

   477                 case opc_fconst_2:

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

   479                     break;

   480                 case opc_iconst_3:

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

   482                     break;

   483                 case opc_iconst_4:

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

   485                     break;

   486                 case opc_iconst_5:

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

   488                     break;

   489                 case opc_ldc: {

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

   491                     String v = encodeConstant(indx);

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

   493                     break;

   494                 }

   495                 case opc_ldc_w:

   496                 case opc_ldc2_w: {

   497                     int indx = readIntArg(byteCodes, i);

   498                     i += 2;

   499                     String v = encodeConstant(indx);

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

   501                     break;

   502                 }

   503                 case opc_lcmp:

   504                 case opc_fcmpl:

   505                 case opc_fcmpg:

   506                 case opc_dcmpl:

   507                 case opc_dcmpg: {

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

   509                     break;

   510                 }

   511                 case opc_if_acmpeq:

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

   513                     break;

   514                 case opc_if_acmpne:

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

   516                     break;

   517                 case opc_if_icmpeq: {

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

   519                     break;

   520                 }

   521                 case opc_ifeq: {

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

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

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

   525                     i += 2;

   526                     break;

   527                 }

   528                 case opc_ifne: {

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

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

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

   532                     i += 2;

   533                     break;

   534                 }

   535                 case opc_iflt: {

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

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

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

   539                     i += 2;

   540                     break;

   541                 }

   542                 case opc_ifle: {

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

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

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

   546                     i += 2;

   547                     break;

   548                 }

   549                 case opc_ifgt: {

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

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

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

   553                     i += 2;

   554                     break;

   555                 }

   556                 case opc_ifge: {

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

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

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

   560                     i += 2;

   561                     break;

   562                 }

   563                 case opc_ifnonnull: {

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

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

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

   567                     i += 2;

   568                     break;

   569                 }

   570                 case opc_ifnull: {

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

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

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

   574                     i += 2;

   575                     break;

   576                 }

   577                 case opc_if_icmpne:

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

   579                     break;

   580                 case opc_if_icmplt:

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

   582                     break;

   583                 case opc_if_icmple:

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

   585                     break;

   586                 case opc_if_icmpgt:

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

   588                     break;

   589                 case opc_if_icmpge:

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

   591                     break;

   592                 case opc_goto: {

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

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

   595                     i += 2;

   596                     break;

   597                 }

   598                 case opc_lookupswitch: {

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

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

   601                     table += 4;

   602                     int n = readInt4(byteCodes, table);

   603                     table += 4;

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

   605                     while (n-- > 0) {

   606                         int cnstnt = readInt4(byteCodes, table);

   607                         table += 4;

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

   609                         table += 4;

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

   611                     }

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

   613                     i = table - 1;

   614                     break;

   615                 }

   616                 case opc_tableswitch: {

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

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

   619                     table += 4;

   620                     int low = readInt4(byteCodes, table);

   621                     table += 4;

   622                     int high = readInt4(byteCodes, table);

   623                     table += 4;

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

   625                     while (low <= high) {

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

   627                         table += 4;

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

   629                         low++;

   630                     }

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

   632                     i = table - 1;

   633                     break;

   634                 }

   635                 case opc_invokeinterface: {

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

   637                     break;

   638                 }

   639                 case opc_invokevirtual:

   640                     i = invokeVirtualMethod(byteCodes, i);

   641                     break;

   642                 case opc_invokespecial:

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

   644                     break;

   645                 case opc_invokestatic:

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

   647                     break;

   648                 case opc_new: {

   649                     int indx = readIntArg(byteCodes, i);

   650                     String ci = jc.getClassName(indx);

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

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

   653                     out.append("());");

   654                     addReference(ci);

   655                     i += 2;

   656                     break;

   657                 }

   658                 case opc_newarray: {

   659                     int type = byteCodes[i++];

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

   661                     break;

   662                 }

   663                 case opc_anewarray: {

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

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

   666                     break;

   667                 }

   668                 case opc_multianewarray: {

   669                     i += 2;

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

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

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

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

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

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

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

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

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

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

   680                             append(";");

   681                     }

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

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

   684                     }

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

   686                     break;

   687                 }

   688                 case opc_arraylength:

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

   690                     break;

   691                 case opc_iastore:

   692                 case opc_lastore:

   693                 case opc_fastore:

   694                 case opc_dastore:

   695                 case opc_aastore:

   696                 case opc_bastore:

   697                 case opc_castore:

   698                 case opc_sastore: {

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

   700                     break;

   701                 }

   702                 case opc_iaload:

   703                 case opc_laload:

   704                 case opc_faload:

   705                 case opc_daload:

   706                 case opc_aaload:

   707                 case opc_baload:

   708                 case opc_caload:

   709                 case opc_saload: {

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

   711                     break;

   712                 }

   713                 case opc_pop2:

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

   715                 case opc_pop:

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

   717                     break;

   718                 case opc_dup:

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

   720                     break;

   721                 case opc_dup_x1:

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

   723                     break;

   724                 case opc_dup_x2:

   725                     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); }");

   726                     break;

   727                 case opc_bipush:

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

   729                     break;

   730                 case opc_sipush:

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

   732                     i += 2;

   733                     break;

   734                 case opc_getfield: {

   735                     int indx = readIntArg(byteCodes, i);

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

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

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

   739                     i += 2;

   740                     break;

   741                 }

   742                 case opc_getstatic: {

   743                     int indx = readIntArg(byteCodes, i);

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

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

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

   747                     i += 2;

   748                     addReference(fi[0]);

   749                     break;

   750                 }

   751                 case opc_putstatic: {

   752                     int indx = readIntArg(byteCodes, i);

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

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

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

   756                     i += 2;

   757                     addReference(fi[0]);

   758                     break;

   759                 }

   760                 case opc_putfield: {

   761                     int indx = readIntArg(byteCodes, i);

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

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

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

   765                     i += 2;

   766                     break;

   767                 }

   768                 case opc_checkcast: {

   769                     int indx = readIntArg(byteCodes, i);

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

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

   772                         // no way to check arrays right now

   773                         out.append("if(s[s.length - 1].$instOf_")

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

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

   776                     }

   777                     i += 2;

   778                     break;

   779                 }

   780                 case opc_instanceof: {

   781                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   786                     i += 2;

   787                     break;

   788                 }

   789                 case opc_athrow: {

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

   791                     break;

   792                 }

   793                 default: {

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

   795                 }

   797             }

   798             if (trap.useTry()) {

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

   800                 for (TrapData e : trap.current()) {

   801                     if (e == null) {

   802                         break;

   803                     }

   804                     if (e.catch_cpx != 0) { //not finally

   805                         final String classInternalName = jc.getClassName(e.catch_cpx);

   806                         addReference(classInternalName);

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

   808                         out.append("gt="+e.handler_pc+"; continue;");

   809                         out.append("} ");

   810                     } else {

   811                         //finally - todo

   812                     }

   813                 }

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

   815                 out.append("}");

   816             }

   817             out.append(" //");

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

   819                 out.append(" ");

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

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

   822             }

   823             out.append("\n");

   824         }

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

   826     }

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

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

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

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

   832         return i + 2;

   833     }

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

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

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

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

   839     }

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

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

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

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

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

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

   846     }

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

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

   849     }

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

   852         int i = 0;

   853         Boolean count = null;

   854         boolean array = false;

   855         sig.append("__");

   856         int firstPos = sig.length();

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

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

   859             switch (ch) {

   860                 case '(':

   861                     count = true;

   862                     continue;

   863                 case ')':

   864                     count = false;

   865                     continue;

   866                 case 'B':

   867                 case 'C':

   868                 case 'D':

   869                 case 'F':

   870                 case 'I':

   871                 case 'J':

   872                 case 'S':

   873                 case 'Z':

   874                     if (count) {

   875                         if (array) {

   876                             sig.append("_3");

   877                         }

   878                         sig.append(ch);

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

   880                             cnt.append('1');

   881                         } else {

   882                             cnt.append('0');

   883                         }

   884                     } else {

   885                         hasReturnType[0] = true;

   886                         sig.insert(firstPos, ch);

   887                         if (array) {

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

   889                         }

   890                     }

   891                     array = false;

   892                     continue;

   893                 case 'V':

   894                     assert !count;

   895                     hasReturnType[0] = false;

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

   897                     continue;

   898                 case 'L':

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

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

   901                     if (count) {

   902                         if (array) {

   903                             sig.append("_3");

   904                         }

   905                         sig.append(realSig);

   906                         cnt.append('0');

   907                     } else {

   908                         sig.insert(firstPos, realSig);

   909                         if (array) {

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

   911                         }

   912                         hasReturnType[0] = true;

   913                     }

   914                     i = next + 1;

   915                     continue;

   916                 case '[':

   917                     array = true;

   918                     continue;

   919                 default:

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

   921             }

   922         }

   923     }

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

   926         StringBuilder sb = new StringBuilder();

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

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

   929             switch (ch) {

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

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

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

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

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

   935             }

   936         }

   937         return sb.toString();

   938     }

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

   941         StringBuilder name = new StringBuilder();

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

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

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

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

   946         } else {

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

   948         }

   950         boolean hasReturn[] = { false };

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

   952         return name.toString();

   953     }

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

   956         StringBuilder name = new StringBuilder();

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

   958         String nm= mi[1];

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

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

   961         } else {

   962             name.append(nm);

   963         }

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

   965         return name.toString();

   966     }

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

   969     throws IOException {

   970         int methodIndex = readIntArg(byteCodes, i);

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

   972         boolean[] hasReturn = { false };

   973         StringBuilder cnt = new StringBuilder();

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

   975         out.append("{ ");

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

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

   978         }

   980         if (hasReturn[0]) {

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

   982         }

   983         final String in = mi[0];

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

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

   986         out.append(mn);

   987         out.append('(');

   988         String sep = "";

   989         if (!isStatic) {

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

   991             sep = ", ";

   992         }

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

   994             out.append(sep);

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

   996             sep = ", ";

   997         }

   998         out.append(")");

   999         if (hasReturn[0]) {

  1000             out.append(")");

  1001         }

  1002         out.append("; }");

  1003         i += 2;

  1004         addReference(in);

  1005         return i;

  1006     }

  1007     private int invokeVirtualMethod(byte[] byteCodes, int i)

  1008     throws IOException {

  1009         int methodIndex = readIntArg(byteCodes, i);

  1010         String[] mi = jc.getFieldInfoName(methodIndex);

  1011         boolean[] hasReturn = { false };

  1012         StringBuilder cnt = new StringBuilder();

  1013         String mn = findMethodName(mi, cnt, hasReturn);

  1014         out.append("{ ");

  1015         for (int j = cnt.length() - 1; j >= 0; j--) {

  1016             out.append("var v" + j).append(" = s.pop(); ");

  1017         }

  1018         out.append("var self = s.pop(); ");

  1019         if (hasReturn[0]) {

  1020             out.append("s.push(");

  1021         }

  1022         out.append("self.");

  1023         out.append(mn);

  1024         out.append('(');

  1025         out.append("self");

  1026         for (int j = 0; j < cnt.length(); j++) {

  1027             out.append(", ");

  1028             out.append("v" + j);

  1029         }

  1030         out.append(")");

  1031         if (hasReturn[0]) {

  1032             out.append(")");

  1033         }

  1034         out.append("; }");

  1035         i += 2;

  1036         return i;

  1037     }

  1039     private void addReference(String cn) throws IOException {

  1040         if (requireReference(cn)) {

  1041             out.append(" /* needs ").append(cn).append(" */");

  1042         }

  1043     }

  1045     private void outType(String d, StringBuilder out) {

  1046         int arr = 0;

  1047         while (d.charAt(0) == '[') {

  1048             out.append('A');

  1049             d = d.substring(1);

  1050         }

  1051         if (d.charAt(0) == 'L') {

  1052             assert d.charAt(d.length() - 1) == ';';

  1053             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1054         } else {

  1055             out.append(d);

  1056         }

  1057     }

  1059     private String encodeConstant(int entryIndex) throws IOException {

  1060         String[] classRef = { null };

  1061         String s = jc.stringValue(entryIndex, classRef);

  1062         if (classRef[0] != null) {

  1063             addReference(classRef[0]);

  1064         }

  1065         return s;

  1066     }

  1068     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1069         byte[] arr = m.findAnnotationData(true);

  1070         if (arr == null) {

  1071             return null;

  1072         }

  1073         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1074         class P extends AnnotationParser {

  1075             public P() {

  1076                 super(false);

  1077             }

  1079             int cnt;

  1080             String[] args = new String[30];

  1081             String body;

  1083             @Override

  1084             protected void visitAttr(String type, String attr, String at, String value) {

  1085                 if (type.equals(jvmType)) {

  1086                     if ("body".equals(attr)) {

  1087                         body = value;

  1088                     } else if ("args".equals(attr)) {

  1089                         args[cnt++] = value;

  1090                     } else {

  1091                         throw new IllegalArgumentException(attr);

  1092                     }

  1093                 }

  1094             }

  1095         }

  1096         P p = new P();

  1097         p.parse(arr, jc);

  1098         if (p.body == null) {

  1099             return null;

  1100         }

  1101         StringBuilder cnt = new StringBuilder();

  1102         final String mn = findMethodName(m, cnt);

  1103         out.append(prefix).append(mn);

  1104         out.append(" = function(");

  1105         String space;

  1106         int index;

  1107         if (!isStatic) {

  1108             out.append(p.args[0]);

  1109             space = ",";

  1110             index = 1;

  1111         } else {

  1112             space = "";

  1113             index = 0;

  1114         }

  1115         for (int i = 0; i < cnt.length(); i++) {

  1116             out.append(space);

  1117             out.append(p.args[index]);

  1118             index++;

  1119             space = ",";

  1120         }

  1121         out.append(") {").append("\n");

  1122         out.append(p.body);

  1123         out.append("\n}\n");

  1124         return mn;

  1125     }

  1126     private static String className(ClassData jc) {

  1127         //return jc.getName().getInternalName().replace('/', '_');

  1128         return jc.getClassName().replace('/', '_');

  1129     }

  1131     private static String[] findAnnotation(

  1132         byte[] arr, ClassData cd, final String className,

  1133         final String... attrNames

  1134     ) throws IOException {

  1135         if (arr == null) {

  1136             return null;

  1137         }

  1138         final String[] values = new String[attrNames.length];

  1139         final boolean[] found = { false };

  1140         final String jvmType = "L" + className.replace('.', '/') + ";";

  1141         AnnotationParser ap = new AnnotationParser(false) {

  1142             @Override

  1143             protected void visitAttr(String type, String attr, String at, String value) {

  1144                 if (type.equals(jvmType)) {

  1145                     found[0] = true;

  1146                     for (int i = 0; i < attrNames.length; i++) {

  1147                         if (attrNames[i].equals(attr)) {

  1148                             values[i] = value;

  1149                         }

  1150                     }

  1151                 }

  1152             }

  1154         };

  1155         ap.parse(arr, cd);

  1156         return found[0] ? values : null;

  1157     }

  1159     private CharSequence initField(FieldData v) {

  1160         final String is = v.getInternalSig();

  1161         if (is.length() == 1) {

  1162             switch (is.charAt(0)) {

  1163                 case 'S':

  1164                 case 'J':

  1165                 case 'B':

  1166                 case 'Z':

  1167                 case 'C':

  1168                 case 'I': return " = 0;";

  1169                 case 'F':

  1170                 case 'D': return " = 0.0;";

  1171                 default:

  1172                     throw new IllegalStateException(is);

  1173             }

  1174         }

  1175         return " = null;";

  1176     }

  1178     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1179         AnnotationParser ap = new AnnotationParser(true) {

  1180             int anno;

  1181             int cnt;

  1183             @Override

  1184             protected void visitAnnotationStart(String type) throws IOException {

  1185                 if (anno++ > 0) {

  1186                     out.append(",");

  1187                 }

  1188                 out.append('"').append(type).append("\" : {\n");

  1189                 cnt = 0;

  1190             }

  1192             @Override

  1193             protected void visitAnnotationEnd(String type) throws IOException {

  1194                 out.append("\n}\n");

  1195             }

  1197             @Override

  1198             protected void visitAttr(String type, String attr, String attrType, String value)

  1199             throws IOException {

  1200                 if (attr == null) {

  1201                     return;

  1202                 }

  1203                 if (cnt++ > 0) {

  1204                     out.append(",\n");

  1205                 }

  1206                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1207             }

  1208         };

  1209         ap.parse(data, cd);

  1210     }

  1211 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sun, 09 Dec 2012 16:25:36 +0100
branch	exceptions
changeset 289	a2ca83ddc521
parent 288	6d1e8eccdc98
child 292	fc3f6ea5e246
permissions	-rw-r--r--