hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@6f696a0ef12f

     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.Vector;

    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(code, m.getexception_table());

   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(code, m.getexception_table());

   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(byte[] byteCodes, Vector exceptionTable) throws IOException {

   266         final java.util.Map<Short, TrapData> exStart = new java.util.HashMap<Short, TrapData>();

   267         final java.util.Map<Short, TrapData> exStop = new java.util.HashMap<Short, TrapData>();

   268         for (int i=0 ; i < exceptionTable.size(); i++) {

   269             final TrapData td = (TrapData)exceptionTable.elementAt(i);

   270             exStart.put(td.start_pc, td);

   271             exStop.put(td.end_pc, td);

   272         }

   273         final java.util.Deque<TrapData> current = new java.util.ArrayDeque<TrapData>();

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

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

   278             {

   279                 TrapData e = exStart.get((short)i);

   280                 if (e != null) {

   281                     current.addFirst(e);

   282                 }

   283                 e = exStop.get((short)i);

   284                 if (e != null) {

   285                     current.remove(e);

   286                 }

   287             }

   288             int prev = i;

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

   290             if (!current.isEmpty()) {

   291                 out.append("try {");

   292             }

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

   294             switch (c) {

   295                 case opc_aload_0:

   296                 case opc_iload_0:

   297                 case opc_lload_0:

   298                 case opc_fload_0:

   299                 case opc_dload_0:

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

   301                     break;

   302                 case opc_aload_1:

   303                 case opc_iload_1:

   304                 case opc_lload_1:

   305                 case opc_fload_1:

   306                 case opc_dload_1:

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

   308                     break;

   309                 case opc_aload_2:

   310                 case opc_iload_2:

   311                 case opc_lload_2:

   312                 case opc_fload_2:

   313                 case opc_dload_2:

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

   315                     break;

   316                 case opc_aload_3:

   317                 case opc_iload_3:

   318                 case opc_lload_3:

   319                 case opc_fload_3:

   320                 case opc_dload_3:

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

   322                     break;

   323                 case opc_iload:

   324                 case opc_lload:

   325                 case opc_fload:

   326                 case opc_dload:

   327                 case opc_aload: {

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

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

   330                     break;

   331                 }

   332                 case opc_istore:

   333                 case opc_lstore:

   334                 case opc_fstore:

   335                 case opc_dstore:

   336                 case opc_astore: {

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

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

   339                     break;

   340                 }

   341                 case opc_astore_0:

   342                 case opc_istore_0:

   343                 case opc_lstore_0:

   344                 case opc_fstore_0:

   345                 case opc_dstore_0:

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

   347                     break;

   348                 case opc_astore_1:

   349                 case opc_istore_1:

   350                 case opc_lstore_1:

   351                 case opc_fstore_1:

   352                 case opc_dstore_1:

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

   354                     break;

   355                 case opc_astore_2:

   356                 case opc_istore_2:

   357                 case opc_lstore_2:

   358                 case opc_fstore_2:

   359                 case opc_dstore_2:

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

   361                     break;

   362                 case opc_astore_3:

   363                 case opc_istore_3:

   364                 case opc_lstore_3:

   365                 case opc_fstore_3:

   366                 case opc_dstore_3:

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

   368                     break;

   369                 case opc_iadd:

   370                 case opc_ladd:

   371                 case opc_fadd:

   372                 case opc_dadd:

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

   374                     break;

   375                 case opc_isub:

   376                 case opc_lsub:

   377                 case opc_fsub:

   378                 case opc_dsub:

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

   380                     break;

   381                 case opc_imul:

   382                 case opc_lmul:

   383                 case opc_fmul:

   384                 case opc_dmul:

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

   386                     break;

   387                 case opc_idiv:

   388                 case opc_ldiv:

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

   390                     break;

   391                 case opc_fdiv:

   392                 case opc_ddiv:

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

   394                     break;

   395                 case opc_irem:

   396                 case opc_lrem:

   397                 case opc_frem:

   398                 case opc_drem:

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

   400                     break;

   401                 case opc_iand:

   402                 case opc_land:

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

   404                     break;

   405                 case opc_ior:

   406                 case opc_lor:

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

   408                     break;

   409                 case opc_ixor:

   410                 case opc_lxor:

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

   412                     break;

   413                 case opc_ineg:

   414                 case opc_lneg:

   415                 case opc_fneg:

   416                 case opc_dneg:

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

   418                     break;

   419                 case opc_ishl:

   420                 case opc_lshl:

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

   422                     break;

   423                 case opc_ishr:

   424                 case opc_lshr:

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

   426                     break;

   427                 case opc_iushr:

   428                 case opc_lushr:

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

   430                     break;

   431                 case opc_iinc: {

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

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

   434                     if (incrBy == 1) {

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

   436                     } else {

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

   438                     }

   439                     break;

   440                 }

   441                 case opc_return:

   442                     out.append("return;");

   443                     break;

   444                 case opc_ireturn:

   445                 case opc_lreturn:

   446                 case opc_freturn:

   447                 case opc_dreturn:

   448                 case opc_areturn:

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

   450                     break;

   451                 case opc_i2l:

   452                 case opc_i2f:

   453                 case opc_i2d:

   454                 case opc_l2i:

   455                     // max int check?

   456                 case opc_l2f:

   457                 case opc_l2d:

   458                 case opc_f2d:

   459                 case opc_d2f:

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

   461                     break;

   462                 case opc_f2i:

   463                 case opc_f2l:

   464                 case opc_d2i:

   465                 case opc_d2l:

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

   467                     break;

   468                 case opc_i2b:

   469                 case opc_i2c:

   470                 case opc_i2s:

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

   472                     break;

   473                 case opc_aconst_null:

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

   475                     break;

   476                 case opc_iconst_m1:

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

   478                     break;

   479                 case opc_iconst_0:

   480                 case opc_dconst_0:

   481                 case opc_lconst_0:

   482                 case opc_fconst_0:

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

   484                     break;

   485                 case opc_iconst_1:

   486                 case opc_lconst_1:

   487                 case opc_fconst_1:

   488                 case opc_dconst_1:

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

   490                     break;

   491                 case opc_iconst_2:

   492                 case opc_fconst_2:

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

   494                     break;

   495                 case opc_iconst_3:

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

   497                     break;

   498                 case opc_iconst_4:

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

   500                     break;

   501                 case opc_iconst_5:

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

   503                     break;

   504                 case opc_ldc: {

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

   506                     String v = encodeConstant(indx);

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

   508                     break;

   509                 }

   510                 case opc_ldc_w:

   511                 case opc_ldc2_w: {

   512                     int indx = readIntArg(byteCodes, i);

   513                     i += 2;

   514                     String v = encodeConstant(indx);

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

   516                     break;

   517                 }

   518                 case opc_lcmp:

   519                 case opc_fcmpl:

   520                 case opc_fcmpg:

   521                 case opc_dcmpl:

   522                 case opc_dcmpg: {

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

   524                     break;

   525                 }

   526                 case opc_if_acmpeq:

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

   528                     break;

   529                 case opc_if_acmpne:

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

   531                     break;

   532                 case opc_if_icmpeq: {

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

   534                     break;

   535                 }

   536                 case opc_ifeq: {

   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_ifne: {

   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_iflt: {

   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_ifle: {

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

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

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

   561                     i += 2;

   562                     break;

   563                 }

   564                 case opc_ifgt: {

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

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

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

   568                     i += 2;

   569                     break;

   570                 }

   571                 case opc_ifge: {

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

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

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

   575                     i += 2;

   576                     break;

   577                 }

   578                 case opc_ifnonnull: {

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

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

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

   582                     i += 2;

   583                     break;

   584                 }

   585                 case opc_ifnull: {

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

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

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

   589                     i += 2;

   590                     break;

   591                 }

   592                 case opc_if_icmpne:

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

   594                     break;

   595                 case opc_if_icmplt:

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

   597                     break;

   598                 case opc_if_icmple:

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

   600                     break;

   601                 case opc_if_icmpgt:

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

   603                     break;

   604                 case opc_if_icmpge:

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

   606                     break;

   607                 case opc_goto: {

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

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

   610                     i += 2;

   611                     break;

   612                 }

   613                 case opc_lookupswitch: {

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

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

   616                     table += 4;

   617                     int n = readInt4(byteCodes, table);

   618                     table += 4;

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

   620                     while (n-- > 0) {

   621                         int cnstnt = readInt4(byteCodes, table);

   622                         table += 4;

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

   624                         table += 4;

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

   626                     }

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

   628                     i = table - 1;

   629                     break;

   630                 }

   631                 case opc_tableswitch: {

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

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

   634                     table += 4;

   635                     int low = readInt4(byteCodes, table);

   636                     table += 4;

   637                     int high = readInt4(byteCodes, table);

   638                     table += 4;

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

   640                     while (low <= high) {

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

   642                         table += 4;

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

   644                         low++;

   645                     }

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

   647                     i = table - 1;

   648                     break;

   649                 }

   650                 case opc_invokeinterface: {

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

   652                     break;

   653                 }

   654                 case opc_invokevirtual:

   655                     i = invokeVirtualMethod(byteCodes, i);

   656                     break;

   657                 case opc_invokespecial:

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

   659                     break;

   660                 case opc_invokestatic:

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

   662                     break;

   663                 case opc_new: {

   664                     int indx = readIntArg(byteCodes, i);

   665                     String ci = jc.getClassName(indx);

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

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

   668                     out.append("());");

   669                     addReference(ci);

   670                     i += 2;

   671                     break;

   672                 }

   673                 case opc_newarray: {

   674                     int type = byteCodes[i++];

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

   676                     break;

   677                 }

   678                 case opc_anewarray: {

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

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

   681                     break;

   682                 }

   683                 case opc_multianewarray: {

   684                     i += 2;

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

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

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

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

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

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

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

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

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

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

   695                             append(";");

   696                     }

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

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

   699                     }

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

   701                     break;

   702                 }

   703                 case opc_arraylength:

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

   705                     break;

   706                 case opc_iastore:

   707                 case opc_lastore:

   708                 case opc_fastore:

   709                 case opc_dastore:

   710                 case opc_aastore:

   711                 case opc_bastore:

   712                 case opc_castore:

   713                 case opc_sastore: {

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

   715                     break;

   716                 }

   717                 case opc_iaload:

   718                 case opc_laload:

   719                 case opc_faload:

   720                 case opc_daload:

   721                 case opc_aaload:

   722                 case opc_baload:

   723                 case opc_caload:

   724                 case opc_saload: {

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

   726                     break;

   727                 }

   728                 case opc_pop2:

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

   730                 case opc_pop:

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

   732                     break;

   733                 case opc_dup:

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

   735                     break;

   736                 case opc_dup_x1:

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

   738                     break;

   739                 case opc_dup_x2:

   740                     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); }");

   741                     break;

   742                 case opc_bipush:

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

   744                     break;

   745                 case opc_sipush:

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

   747                     i += 2;

   748                     break;

   749                 case opc_getfield: {

   750                     int indx = readIntArg(byteCodes, i);

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

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

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

   754                     i += 2;

   755                     break;

   756                 }

   757                 case opc_getstatic: {

   758                     int indx = readIntArg(byteCodes, i);

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

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

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

   762                     i += 2;

   763                     addReference(fi[0]);

   764                     break;

   765                 }

   766                 case opc_putstatic: {

   767                     int indx = readIntArg(byteCodes, i);

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

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

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

   771                     i += 2;

   772                     addReference(fi[0]);

   773                     break;

   774                 }

   775                 case opc_putfield: {

   776                     int indx = readIntArg(byteCodes, i);

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

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

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

   780                     i += 2;

   781                     break;

   782                 }

   783                 case opc_checkcast: {

   784                     int indx = readIntArg(byteCodes, i);

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

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

   787                         // no way to check arrays right now

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

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

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

   791                     }

   792                     i += 2;

   793                     break;

   794                 }

   795                 case opc_instanceof: {

   796                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   801                     i += 2;

   802                     break;

   803                 }

   804                 case opc_athrow: {

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

   806                     break;

   807                 }

   808                 default: {

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

   810                 }

   812             }

   813             if (!current.isEmpty()) {

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

   815                 for (TrapData e : current) {

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

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

   818                         addReference(classInternalName);

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

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

   821                         out.append("} ");

   822                     } else {

   823                         //finally - todo

   824                     }

   825                 }

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

   827                 out.append("}");

   828             }

   829             out.append(" //");

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

   831                 out.append(" ");

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

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

   834             }

   835             out.append("\n");

   836         }

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

   838     }

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

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

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

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

   844         return i + 2;

   845     }

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

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

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

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

   851     }

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

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

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

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

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

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

   858     }

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

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

   861     }

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

   864         int i = 0;

   865         Boolean count = null;

   866         boolean array = false;

   867         sig.append("__");

   868         int firstPos = sig.length();

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

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

   871             switch (ch) {

   872                 case '(':

   873                     count = true;

   874                     continue;

   875                 case ')':

   876                     count = false;

   877                     continue;

   878                 case 'B':

   879                 case 'C':

   880                 case 'D':

   881                 case 'F':

   882                 case 'I':

   883                 case 'J':

   884                 case 'S':

   885                 case 'Z':

   886                     if (count) {

   887                         if (array) {

   888                             sig.append("_3");

   889                         }

   890                         sig.append(ch);

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

   892                             cnt.append('1');

   893                         } else {

   894                             cnt.append('0');

   895                         }

   896                     } else {

   897                         hasReturnType[0] = true;

   898                         sig.insert(firstPos, ch);

   899                         if (array) {

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

   901                         }

   902                     }

   903                     array = false;

   904                     continue;

   905                 case 'V':

   906                     assert !count;

   907                     hasReturnType[0] = false;

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

   909                     continue;

   910                 case 'L':

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

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

   913                     if (count) {

   914                         if (array) {

   915                             sig.append("_3");

   916                         }

   917                         sig.append(realSig);

   918                         cnt.append('0');

   919                     } else {

   920                         sig.insert(firstPos, realSig);

   921                         if (array) {

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

   923                         }

   924                         hasReturnType[0] = true;

   925                     }

   926                     i = next + 1;

   927                     continue;

   928                 case '[':

   929                     array = true;

   930                     continue;

   931                 default:

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

   933             }

   934         }

   935     }

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

   938         StringBuilder sb = new StringBuilder();

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

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

   941             switch (ch) {

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

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

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

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

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

   947             }

   948         }

   949         return sb.toString();

   950     }

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

   953         StringBuilder name = new StringBuilder();

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

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

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

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

   958         } else {

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

   960         }

   962         boolean hasReturn[] = { false };

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

   964         return name.toString();

   965     }

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

   968         StringBuilder name = new StringBuilder();

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

   970         String nm= mi[1];

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

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

   973         } else {

   974             name.append(nm);

   975         }

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

   977         return name.toString();

   978     }

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

   981     throws IOException {

   982         int methodIndex = readIntArg(byteCodes, i);

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

   984         boolean[] hasReturn = { false };

   985         StringBuilder cnt = new StringBuilder();

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

   987         out.append("{ ");

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

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

   990         }

   992         if (hasReturn[0]) {

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

   994         }

   995         final String in = mi[0];

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

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

   998         out.append(mn);

   999         out.append('(');

  1000         String sep = "";

  1001         if (!isStatic) {

  1002             out.append("s.pop()");

  1003             sep = ", ";

  1004         }

  1005         for (int j = 0; j < cnt.length(); j++) {

  1006             out.append(sep);

  1007             out.append("v" + j);

  1008             sep = ", ";

  1009         }

  1010         out.append(")");

  1011         if (hasReturn[0]) {

  1012             out.append(")");

  1013         }

  1014         out.append("; }");

  1015         i += 2;

  1016         addReference(in);

  1017         return i;

  1018     }

  1019     private int invokeVirtualMethod(byte[] byteCodes, int i)

  1020     throws IOException {

  1021         int methodIndex = readIntArg(byteCodes, i);

  1022         String[] mi = jc.getFieldInfoName(methodIndex);

  1023         boolean[] hasReturn = { false };

  1024         StringBuilder cnt = new StringBuilder();

  1025         String mn = findMethodName(mi, cnt, hasReturn);

  1026         out.append("{ ");

  1027         for (int j = cnt.length() - 1; j >= 0; j--) {

  1028             out.append("var v" + j).append(" = s.pop(); ");

  1029         }

  1030         out.append("var self = s.pop(); ");

  1031         if (hasReturn[0]) {

  1032             out.append("s.push(");

  1033         }

  1034         out.append("self.");

  1035         out.append(mn);

  1036         out.append('(');

  1037         out.append("self");

  1038         for (int j = 0; j < cnt.length(); j++) {

  1039             out.append(", ");

  1040             out.append("v" + j);

  1041         }

  1042         out.append(")");

  1043         if (hasReturn[0]) {

  1044             out.append(")");

  1045         }

  1046         out.append("; }");

  1047         i += 2;

  1048         return i;

  1049     }

  1051     private void addReference(String cn) throws IOException {

  1052         if (requireReference(cn)) {

  1053             out.append(" /* needs ").append(cn).append(" */");

  1054         }

  1055     }

  1057     private void outType(String d, StringBuilder out) {

  1058         int arr = 0;

  1059         while (d.charAt(0) == '[') {

  1060             out.append('A');

  1061             d = d.substring(1);

  1062         }

  1063         if (d.charAt(0) == 'L') {

  1064             assert d.charAt(d.length() - 1) == ';';

  1065             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1066         } else {

  1067             out.append(d);

  1068         }

  1069     }

  1071     private String encodeConstant(int entryIndex) throws IOException {

  1072         String[] classRef = { null };

  1073         String s = jc.stringValue(entryIndex, classRef);

  1074         if (classRef[0] != null) {

  1075             addReference(classRef[0]);

  1076         }

  1077         return s;

  1078     }

  1080     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1081         byte[] arr = m.findAnnotationData(true);

  1082         if (arr == null) {

  1083             return null;

  1084         }

  1085         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1086         class P extends AnnotationParser {

  1087             public P() {

  1088                 super(false);

  1089             }

  1091             int cnt;

  1092             String[] args = new String[30];

  1093             String body;

  1095             @Override

  1096             protected void visitAttr(String type, String attr, String at, String value) {

  1097                 if (type.equals(jvmType)) {

  1098                     if ("body".equals(attr)) {

  1099                         body = value;

  1100                     } else if ("args".equals(attr)) {

  1101                         args[cnt++] = value;

  1102                     } else {

  1103                         throw new IllegalArgumentException(attr);

  1104                     }

  1105                 }

  1106             }

  1107         }

  1108         P p = new P();

  1109         p.parse(arr, jc);

  1110         if (p.body == null) {

  1111             return null;

  1112         }

  1113         StringBuilder cnt = new StringBuilder();

  1114         final String mn = findMethodName(m, cnt);

  1115         out.append(prefix).append(mn);

  1116         out.append(" = function(");

  1117         String space;

  1118         int index;

  1119         if (!isStatic) {

  1120             out.append(p.args[0]);

  1121             space = ",";

  1122             index = 1;

  1123         } else {

  1124             space = "";

  1125             index = 0;

  1126         }

  1127         for (int i = 0; i < cnt.length(); i++) {

  1128             out.append(space);

  1129             out.append(p.args[index]);

  1130             index++;

  1131             space = ",";

  1132         }

  1133         out.append(") {").append("\n");

  1134         out.append(p.body);

  1135         out.append("\n}\n");

  1136         return mn;

  1137     }

  1138     private static String className(ClassData jc) {

  1139         //return jc.getName().getInternalName().replace('/', '_');

  1140         return jc.getClassName().replace('/', '_');

  1141     }

  1143     private static String[] findAnnotation(

  1144         byte[] arr, ClassData cd, final String className,

  1145         final String... attrNames

  1146     ) throws IOException {

  1147         if (arr == null) {

  1148             return null;

  1149         }

  1150         final String[] values = new String[attrNames.length];

  1151         final boolean[] found = { false };

  1152         final String jvmType = "L" + className.replace('.', '/') + ";";

  1153         AnnotationParser ap = new AnnotationParser(false) {

  1154             @Override

  1155             protected void visitAttr(String type, String attr, String at, String value) {

  1156                 if (type.equals(jvmType)) {

  1157                     found[0] = true;

  1158                     for (int i = 0; i < attrNames.length; i++) {

  1159                         if (attrNames[i].equals(attr)) {

  1160                             values[i] = value;

  1161                         }

  1162                     }

  1163                 }

  1164             }

  1166         };

  1167         ap.parse(arr, cd);

  1168         return found[0] ? values : null;

  1169     }

  1171     private CharSequence initField(FieldData v) {

  1172         final String is = v.getInternalSig();

  1173         if (is.length() == 1) {

  1174             switch (is.charAt(0)) {

  1175                 case 'S':

  1176                 case 'J':

  1177                 case 'B':

  1178                 case 'Z':

  1179                 case 'C':

  1180                 case 'I': return " = 0;";

  1181                 case 'F':

  1182                 case 'D': return " = 0.0;";

  1183                 default:

  1184                     throw new IllegalStateException(is);

  1185             }

  1186         }

  1187         return " = null;";

  1188     }

  1190     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1191         AnnotationParser ap = new AnnotationParser(true) {

  1192             int anno;

  1193             int cnt;

  1195             @Override

  1196             protected void visitAnnotationStart(String type) throws IOException {

  1197                 if (anno++ > 0) {

  1198                     out.append(",");

  1199                 }

  1200                 out.append('"').append(type).append("\" : {\n");

  1201                 cnt = 0;

  1202             }

  1204             @Override

  1205             protected void visitAnnotationEnd(String type) throws IOException {

  1206                 out.append("\n}\n");

  1207             }

  1209             @Override

  1210             protected void visitAttr(String type, String attr, String attrType, String value)

  1211             throws IOException {

  1212                 if (attr == null) {

  1213                     return;

  1214                 }

  1215                 if (cnt++ > 0) {

  1216                     out.append(",\n");

  1217                 }

  1218                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1219             }

  1220         };

  1221         ap.parse(data, cd);

  1222     }

  1223 }

author	tzezula
	Sat, 08 Dec 2012 10:32:04 +0100
branch	exceptions
changeset 287	6f696a0ef12f
parent 272	a6a23aa7a546
parent 285	c8be2d837788
child 288	6d1e8eccdc98
permissions	-rw-r--r--