hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@a20721a10717

     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.*;

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

    29  *

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

    31  */

    32 public abstract class ByteCodeToJavaScript {

    33     private ClassData jc;

    34     final Appendable out;

    36     protected ByteCodeToJavaScript(Appendable out) {

    37         this.out = out;

    38     }

    40     /* Collects additional required resources.

    41      *

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

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

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

    45      */

    46     protected abstract boolean requireReference(String internalClassName);

    48     /*

    49      * @param resourcePath name of resources to read

    50      */

    51     protected abstract void requireScript(String resourcePath);

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

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

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

    56      *

    57      * @param className suggested name of the class

    58      */

    59     protected String assignClass(String className) {

    60         return className + " = ";

    61     }

    63     /**

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

    65      *

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

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

    68      *

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

    70      */

    72     public String compile(InputStream classFile) throws IOException {

    73         this.jc = new ClassData(classFile);

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

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

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

    77             "resource", "processByteCode"

    78         );

    79         if (arr != null) {

    80             requireScript(arr[0]);

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

    82                 return null;

    83             }

    84         }

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

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

    87             "container", "prototype"

    88         );

    89         StringArray toInitilize = new StringArray();

    90         final String className = className(jc);

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

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

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

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

    95             if (v.isStatic()) {

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

    97             }

    98         }

    99         if (proto == null) {

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

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

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

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

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

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

   106         } else {

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

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

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

   110         }

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

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

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

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

   115                 "name", "value"

   116             );

   117             if (only != null) {

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

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

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

   121                 }

   122                 continue;

   123             }

   124             String mn;

   125             if (m.isStatic()) {

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

   127             } else {

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

   129             }

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

   131             if (runAnno != null) {

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

   133                 generateAnno(jc, out, runAnno);

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

   135             }

   136         }

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

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

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

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

   141         }

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

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

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

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

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

   147         if (classAnno != null) {

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

   149             generateAnno(jc, out, classAnno);

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

   151         }

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

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

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

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

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

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

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

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

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

   161                 "name", "value"

   162             );

   163             if (only != null) {

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

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

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

   167                 }

   168                 continue;

   169             }

   170             if (!v.isStatic()) {

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

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

   173             }

   174         }

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

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

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

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

   179         StringBuilder sb = new StringBuilder();

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

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

   182         }

   183         return sb.toString();

   184     }

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

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

   187         if (jsb != null) {

   188             return jsb;

   189         }

   190         StringBuilder argsCnt = new StringBuilder();

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

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

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

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

   195         }

   196         out.append('(');

   197         String space = "";

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

   199             out.append(space);

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

   201             space = ",";

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

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

   204                 index += 2;

   205             } else {

   206                 index++;

   207             }

   208         }

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

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

   211         if (code != null) {

   212             int len = m.getMaxLocals();

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

   214                 out.append("  var ");

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

   216             }

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

   218             produceCode(code);

   219         } else {

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

   221         }

   222         out.append("};");

   223         return mn;

   224     }

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

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

   228         if (jsb != null) {

   229             return jsb;

   230         }

   231         StringBuilder argsCnt = new StringBuilder();

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

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

   234         out.append("(arg0");

   235         String space = ",";

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

   237             out.append(space);

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

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

   240                 index += 2;

   241             } else {

   242                 index++;

   243             }

   244         }

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

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

   247         if (code != null) {

   248             int len = m.getMaxLocals();

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

   250                 out.append("  var ");

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

   252             }

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

   254             produceCode(code);

   255         } else {

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

   257         }

   258         out.append("};");

   259         return mn;

   260     }

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

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

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

   265             int prev = i;

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

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

   268             switch (c) {

   269                 case opc_aload_0:

   270                 case opc_iload_0:

   271                 case opc_lload_0:

   272                 case opc_fload_0:

   273                 case opc_dload_0:

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

   275                     break;

   276                 case opc_aload_1:

   277                 case opc_iload_1:

   278                 case opc_lload_1:

   279                 case opc_fload_1:

   280                 case opc_dload_1:

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

   282                     break;

   283                 case opc_aload_2:

   284                 case opc_iload_2:

   285                 case opc_lload_2:

   286                 case opc_fload_2:

   287                 case opc_dload_2:

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

   289                     break;

   290                 case opc_aload_3:

   291                 case opc_iload_3:

   292                 case opc_lload_3:

   293                 case opc_fload_3:

   294                 case opc_dload_3:

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

   296                     break;

   297                 case opc_iload:

   298                 case opc_lload:

   299                 case opc_fload:

   300                 case opc_dload:

   301                 case opc_aload: {

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

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

   304                     break;

   305                 }

   306                 case opc_istore:

   307                 case opc_lstore:

   308                 case opc_fstore:

   309                 case opc_dstore:

   310                 case opc_astore: {

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

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

   313                     break;

   314                 }

   315                 case opc_astore_0:

   316                 case opc_istore_0:

   317                 case opc_lstore_0:

   318                 case opc_fstore_0:

   319                 case opc_dstore_0:

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

   321                     break;

   322                 case opc_astore_1:

   323                 case opc_istore_1:

   324                 case opc_lstore_1:

   325                 case opc_fstore_1:

   326                 case opc_dstore_1:

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

   328                     break;

   329                 case opc_astore_2:

   330                 case opc_istore_2:

   331                 case opc_lstore_2:

   332                 case opc_fstore_2:

   333                 case opc_dstore_2:

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

   335                     break;

   336                 case opc_astore_3:

   337                 case opc_istore_3:

   338                 case opc_lstore_3:

   339                 case opc_fstore_3:

   340                 case opc_dstore_3:

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

   342                     break;

   343                 case opc_iadd:

   344                 case opc_ladd:

   345                 case opc_fadd:

   346                 case opc_dadd:

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

   348                     break;

   349                 case opc_isub:

   350                 case opc_lsub:

   351                 case opc_fsub:

   352                 case opc_dsub:

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

   354                     break;

   355                 case opc_imul:

   356                 case opc_lmul:

   357                 case opc_fmul:

   358                 case opc_dmul:

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

   360                     break;

   361                 case opc_idiv:

   362                 case opc_ldiv:

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

   364                     break;

   365                 case opc_fdiv:

   366                 case opc_ddiv:

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

   368                     break;

   369                 case opc_irem:

   370                 case opc_lrem:

   371                 case opc_frem:

   372                 case opc_drem:

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

   374                     break;

   375                 case opc_iand:

   376                 case opc_land:

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

   378                     break;

   379                 case opc_ior:

   380                 case opc_lor:

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

   382                     break;

   383                 case opc_ixor:

   384                 case opc_lxor:

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

   386                     break;

   387                 case opc_ineg:

   388                 case opc_lneg:

   389                 case opc_fneg:

   390                 case opc_dneg:

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

   392                     break;

   393                 case opc_ishl:

   394                 case opc_lshl:

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

   396                     break;

   397                 case opc_ishr:

   398                 case opc_lshr:

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

   400                     break;

   401                 case opc_iushr:

   402                 case opc_lushr:

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

   404                     break;

   405                 case opc_iinc: {

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

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

   408                     if (incrBy == 1) {

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

   410                     } else {

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

   412                     }

   413                     break;

   414                 }

   415                 case opc_return:

   416                     out.append("return;");

   417                     break;

   418                 case opc_ireturn:

   419                 case opc_lreturn:

   420                 case opc_freturn:

   421                 case opc_dreturn:

   422                 case opc_areturn:

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

   424                     break;

   425                 case opc_i2l:

   426                 case opc_i2f:

   427                 case opc_i2d:

   428                 case opc_l2i:

   429                     // max int check?

   430                 case opc_l2f:

   431                 case opc_l2d:

   432                 case opc_f2d:

   433                 case opc_d2f:

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

   435                     break;

   436                 case opc_f2i:

   437                 case opc_f2l:

   438                 case opc_d2i:

   439                 case opc_d2l:

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

   441                     break;

   442                 case opc_i2b:

   443                 case opc_i2c:

   444                 case opc_i2s:

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

   446                     break;

   447                 case opc_aconst_null:

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

   449                     break;

   450                 case opc_iconst_m1:

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

   452                     break;

   453                 case opc_iconst_0:

   454                 case opc_dconst_0:

   455                 case opc_lconst_0:

   456                 case opc_fconst_0:

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

   458                     break;

   459                 case opc_iconst_1:

   460                 case opc_lconst_1:

   461                 case opc_fconst_1:

   462                 case opc_dconst_1:

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

   464                     break;

   465                 case opc_iconst_2:

   466                 case opc_fconst_2:

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

   468                     break;

   469                 case opc_iconst_3:

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

   471                     break;

   472                 case opc_iconst_4:

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

   474                     break;

   475                 case opc_iconst_5:

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

   477                     break;

   478                 case opc_ldc: {

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

   480                     String v = encodeConstant(indx);

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

   482                     break;

   483                 }

   484                 case opc_ldc_w:

   485                 case opc_ldc2_w: {

   486                     int indx = readIntArg(byteCodes, i);

   487                     i += 2;

   488                     String v = encodeConstant(indx);

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

   490                     break;

   491                 }

   492                 case opc_lcmp:

   493                 case opc_fcmpl:

   494                 case opc_fcmpg:

   495                 case opc_dcmpl:

   496                 case opc_dcmpg: {

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

   498                     break;

   499                 }

   500                 case opc_if_acmpeq:

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

   502                     break;

   503                 case opc_if_acmpne:

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

   505                     break;

   506                 case opc_if_icmpeq: {

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

   508                     break;

   509                 }

   510                 case opc_ifeq: {

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

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

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

   514                     i += 2;

   515                     break;

   516                 }

   517                 case opc_ifne: {

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

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

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

   521                     i += 2;

   522                     break;

   523                 }

   524                 case opc_iflt: {

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

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

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

   528                     i += 2;

   529                     break;

   530                 }

   531                 case opc_ifle: {

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

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

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

   535                     i += 2;

   536                     break;

   537                 }

   538                 case opc_ifgt: {

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

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

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

   542                     i += 2;

   543                     break;

   544                 }

   545                 case opc_ifge: {

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

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

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

   549                     i += 2;

   550                     break;

   551                 }

   552                 case opc_ifnonnull: {

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

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

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

   556                     i += 2;

   557                     break;

   558                 }

   559                 case opc_ifnull: {

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

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

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

   563                     i += 2;

   564                     break;

   565                 }

   566                 case opc_if_icmpne:

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

   568                     break;

   569                 case opc_if_icmplt:

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

   571                     break;

   572                 case opc_if_icmple:

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

   574                     break;

   575                 case opc_if_icmpgt:

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

   577                     break;

   578                 case opc_if_icmpge:

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

   580                     break;

   581                 case opc_goto: {

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

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

   584                     i += 2;

   585                     break;

   586                 }

   587                 case opc_lookupswitch: {

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

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

   590                     table += 4;

   591                     int n = readInt4(byteCodes, table);

   592                     table += 4;

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

   594                     while (n-- > 0) {

   595                         int cnstnt = readInt4(byteCodes, table);

   596                         table += 4;

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

   598                         table += 4;

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

   600                     }

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

   602                     i = table - 1;

   603                     break;

   604                 }

   605                 case opc_tableswitch: {

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

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

   608                     table += 4;

   609                     int low = readInt4(byteCodes, table);

   610                     table += 4;

   611                     int high = readInt4(byteCodes, table);

   612                     table += 4;

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

   614                     while (low <= high) {

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

   616                         table += 4;

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

   618                         low++;

   619                     }

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

   621                     i = table - 1;

   622                     break;

   623                 }

   624                 case opc_invokeinterface: {

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

   626                     break;

   627                 }

   628                 case opc_invokevirtual:

   629                     i = invokeVirtualMethod(byteCodes, i);

   630                     break;

   631                 case opc_invokespecial:

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

   633                     break;

   634                 case opc_invokestatic:

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

   636                     break;

   637                 case opc_new: {

   638                     int indx = readIntArg(byteCodes, i);

   639                     String ci = jc.getClassName(indx);

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

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

   642                     out.append("());");

   643                     addReference(ci);

   644                     i += 2;

   645                     break;

   646                 }

   647                 case opc_newarray: {

   648                     int type = byteCodes[i++];

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

   650                     break;

   651                 }

   652                 case opc_anewarray: {

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

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

   655                     break;

   656                 }

   657                 case opc_multianewarray: {

   658                     i += 2;

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

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

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

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

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

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

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

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

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

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

   669                             append(";");

   670                     }

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

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

   673                     }

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

   675                     break;

   676                 }

   677                 case opc_arraylength:

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

   679                     break;

   680                 case opc_iastore:

   681                 case opc_lastore:

   682                 case opc_fastore:

   683                 case opc_dastore:

   684                 case opc_aastore:

   685                 case opc_bastore:

   686                 case opc_castore:

   687                 case opc_sastore: {

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

   689                     break;

   690                 }

   691                 case opc_iaload:

   692                 case opc_laload:

   693                 case opc_faload:

   694                 case opc_daload:

   695                 case opc_aaload:

   696                 case opc_baload:

   697                 case opc_caload:

   698                 case opc_saload: {

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

   700                     break;

   701                 }

   702                 case opc_pop2:

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

   704                 case opc_pop:

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

   706                     break;

   707                 case opc_dup:

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

   709                     break;

   710                 case opc_dup_x1:

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

   712                     break;

   713                 case opc_dup_x2:

   714                     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); }");

   715                     break;

   716                 case opc_bipush:

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

   718                     break;

   719                 case opc_sipush:

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

   721                     i += 2;

   722                     break;

   723                 case opc_getfield: {

   724                     int indx = readIntArg(byteCodes, i);

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

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

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

   728                     i += 2;

   729                     break;

   730                 }

   731                 case opc_getstatic: {

   732                     int indx = readIntArg(byteCodes, i);

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

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

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

   736                     i += 2;

   737                     addReference(fi[0]);

   738                     break;

   739                 }

   740                 case opc_putstatic: {

   741                     int indx = readIntArg(byteCodes, i);

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

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

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

   745                     i += 2;

   746                     addReference(fi[0]);

   747                     break;

   748                 }

   749                 case opc_putfield: {

   750                     int indx = readIntArg(byteCodes, i);

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

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

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

   754                     i += 2;

   755                     break;

   756                 }

   757                 case opc_checkcast: {

   758                     int indx = readIntArg(byteCodes, i);

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

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

   761                         // no way to check arrays right now

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

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

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

   765                     }

   766                     i += 2;

   767                     break;

   768                 }

   769                 case opc_instanceof: {

   770                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   775                     i += 2;

   776                     break;

   777                 }

   778                 case opc_athrow: {

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

   780                     break;

   781                 }

   782                 default: {

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

   784                 }

   786             }

   787             out.append(" //");

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

   789                 out.append(" ");

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

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

   792             }

   793             out.append("\n");

   794         }

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

   796     }

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

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

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

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

   802         return i + 2;

   803     }

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

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

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

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

   809     }

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

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

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

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

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

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

   816     }

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

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

   819     }

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

   822         int i = 0;

   823         Boolean count = null;

   824         boolean array = false;

   825         sig.append("__");

   826         int firstPos = sig.length();

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

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

   829             switch (ch) {

   830                 case '(':

   831                     count = true;

   832                     continue;

   833                 case ')':

   834                     count = false;

   835                     continue;

   836                 case 'B':

   837                 case 'C':

   838                 case 'D':

   839                 case 'F':

   840                 case 'I':

   841                 case 'J':

   842                 case 'S':

   843                 case 'Z':

   844                     if (count) {

   845                         if (array) {

   846                             sig.append("_3");

   847                         }

   848                         sig.append(ch);

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

   850                             cnt.append('1');

   851                         } else {

   852                             cnt.append('0');

   853                         }

   854                     } else {

   855                         hasReturnType[0] = true;

   856                         sig.insert(firstPos, ch);

   857                         if (array) {

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

   859                         }

   860                     }

   861                     array = false;

   862                     continue;

   863                 case 'V':

   864                     assert !count;

   865                     hasReturnType[0] = false;

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

   867                     continue;

   868                 case 'L':

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

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

   871                     if (count) {

   872                         if (array) {

   873                             sig.append("_3");

   874                         }

   875                         sig.append(realSig);

   876                         cnt.append('0');

   877                     } else {

   878                         sig.insert(firstPos, realSig);

   879                         if (array) {

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

   881                         }

   882                         hasReturnType[0] = true;

   883                     }

   884                     i = next + 1;

   885                     continue;

   886                 case '[':

   887                     array = true;

   888                     continue;

   889                 default:

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

   891             }

   892         }

   893     }

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

   896         StringBuilder sb = new StringBuilder();

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

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

   899             switch (ch) {

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

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

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

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

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

   905             }

   906         }

   907         return sb.toString();

   908     }

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

   911         StringBuilder name = new StringBuilder();

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

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

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

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

   916         } else {

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

   918         }

   920         boolean hasReturn[] = { false };

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

   922         return name.toString();

   923     }

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

   926         StringBuilder name = new StringBuilder();

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

   928         String nm= mi[1];

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

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

   931         } else {

   932             name.append(nm);

   933         }

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

   935         return name.toString();

   936     }

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

   939     throws IOException {

   940         int methodIndex = readIntArg(byteCodes, i);

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

   942         boolean[] hasReturn = { false };

   943         StringBuilder cnt = new StringBuilder();

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

   945         out.append("{ ");

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

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

   948         }

   950         if (hasReturn[0]) {

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

   952         }

   953         final String in = mi[0];

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

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

   956         out.append(mn);

   957         out.append('(');

   958         String sep = "";

   959         if (!isStatic) {

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

   961             sep = ", ";

   962         }

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

   964             out.append(sep);

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

   966             sep = ", ";

   967         }

   968         out.append(")");

   969         if (hasReturn[0]) {

   970             out.append(")");

   971         }

   972         out.append("; }");

   973         i += 2;

   974         addReference(in);

   975         return i;

   976     }

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

   978     throws IOException {

   979         int methodIndex = readIntArg(byteCodes, i);

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

   981         boolean[] hasReturn = { false };

   982         StringBuilder cnt = new StringBuilder();

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

   984         out.append("{ ");

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

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

   987         }

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

   989         if (hasReturn[0]) {

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

   991         }

   992         out.append("self.");

   993         out.append(mn);

   994         out.append('(');

   995         out.append("self");

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

   997             out.append(", ");

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

   999         }

  1000         out.append(")");

  1001         if (hasReturn[0]) {

  1002             out.append(")");

  1003         }

  1004         out.append("; }");

  1005         i += 2;

  1006         return i;

  1007     }

  1009     private void addReference(String cn) throws IOException {

  1010         if (requireReference(cn)) {

  1011             out.append(" /* needs ").append(cn).append(" */");

  1012         }

  1013     }

  1015     private void outType(String d, StringBuilder out) {

  1016         int arr = 0;

  1017         while (d.charAt(0) == '[') {

  1018             out.append('A');

  1019             d = d.substring(1);

  1020         }

  1021         if (d.charAt(0) == 'L') {

  1022             assert d.charAt(d.length() - 1) == ';';

  1023             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1024         } else {

  1025             out.append(d);

  1026         }

  1027     }

  1029     private String encodeConstant(int entryIndex) throws IOException {

  1030         String[] classRef = { null };

  1031         String s = jc.stringValue(entryIndex, classRef);

  1032         if (classRef[0] != null) {

  1033             addReference(classRef[0]);

  1034         }

  1035         return s;

  1036     }

  1038     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1039         byte[] arr = m.findAnnotationData(true);

  1040         if (arr == null) {

  1041             return null;

  1042         }

  1043         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1044         class P extends AnnotationParser {

  1045             public P() {

  1046                 super(false);

  1047             }

  1049             int cnt;

  1050             String[] args = new String[30];

  1051             String body;

  1053             @Override

  1054             protected void visitAttr(String type, String attr, String at, String value) {

  1055                 if (type.equals(jvmType)) {

  1056                     if ("body".equals(attr)) {

  1057                         body = value;

  1058                     } else if ("args".equals(attr)) {

  1059                         args[cnt++] = value;

  1060                     } else {

  1061                         throw new IllegalArgumentException(attr);

  1062                     }

  1063                 }

  1064             }

  1065         }

  1066         P p = new P();

  1067         p.parse(arr, jc);

  1068         if (p.body == null) {

  1069             return null;

  1070         }

  1071         StringBuilder cnt = new StringBuilder();

  1072         final String mn = findMethodName(m, cnt);

  1073         out.append(prefix).append(mn);

  1074         out.append(" = function(");

  1075         String space;

  1076         int index;

  1077         if (!isStatic) {

  1078             out.append(p.args[0]);

  1079             space = ",";

  1080             index = 1;

  1081         } else {

  1082             space = "";

  1083             index = 0;

  1084         }

  1085         for (int i = 0; i < cnt.length(); i++) {

  1086             out.append(space);

  1087             out.append(p.args[index]);

  1088             index++;

  1089             space = ",";

  1090         }

  1091         out.append(") {").append("\n");

  1092         out.append(p.body);

  1093         out.append("\n}\n");

  1094         return mn;

  1095     }

  1096     private static String className(ClassData jc) {

  1097         //return jc.getName().getInternalName().replace('/', '_');

  1098         return jc.getClassName().replace('/', '_');

  1099     }

  1101     private static String[] findAnnotation(

  1102         byte[] arr, ClassData cd, final String className,

  1103         final String... attrNames

  1104     ) throws IOException {

  1105         if (arr == null) {

  1106             return null;

  1107         }

  1108         final String[] values = new String[attrNames.length];

  1109         final boolean[] found = { false };

  1110         final String jvmType = "L" + className.replace('.', '/') + ";";

  1111         AnnotationParser ap = new AnnotationParser(false) {

  1112             @Override

  1113             protected void visitAttr(String type, String attr, String at, String value) {

  1114                 if (type.equals(jvmType)) {

  1115                     found[0] = true;

  1116                     for (int i = 0; i < attrNames.length; i++) {

  1117                         if (attrNames[i].equals(attr)) {

  1118                             values[i] = value;

  1119                         }

  1120                     }

  1121                 }

  1122             }

  1124         };

  1125         ap.parse(arr, cd);

  1126         return found[0] ? values : null;

  1127     }

  1129     private CharSequence initField(FieldData v) {

  1130         final String is = v.getInternalSig();

  1131         if (is.length() == 1) {

  1132             switch (is.charAt(0)) {

  1133                 case 'S':

  1134                 case 'J':

  1135                 case 'B':

  1136                 case 'Z':

  1137                 case 'C':

  1138                 case 'I': return " = 0;";

  1139                 case 'F':

  1140                 case 'D': return " = 0.0;";

  1141                 default:

  1142                     throw new IllegalStateException(is);

  1143             }

  1144         }

  1145         return " = null;";

  1146     }

  1148     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1149         AnnotationParser ap = new AnnotationParser(true) {

  1150             int anno;

  1151             int cnt;

  1153             @Override

  1154             protected void visitAnnotationStart(String type) throws IOException {

  1155                 if (anno++ > 0) {

  1156                     out.append(",");

  1157                 }

  1158                 out.append('"').append(type).append("\" : {\n");

  1159                 cnt = 0;

  1160             }

  1162             @Override

  1163             protected void visitAnnotationEnd(String type) throws IOException {

  1164                 out.append("\n}\n");

  1165             }

  1167             @Override

  1168             protected void visitAttr(String type, String attr, String attrType, String value)

  1169             throws IOException {

  1170                 if (attr == null) {

  1171                     return;

  1172                 }

  1173                 if (cnt++ > 0) {

  1174                     out.append(",\n");

  1175                 }

  1176                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1177             }

  1178         };

  1179         ap.parse(data, cd);

  1180     }

  1181 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Mon, 10 Dec 2012 12:03:22 +0100
changeset 297	a20721a10717
parent 272	a6a23aa7a546
child 292	fc3f6ea5e246
child 306	f36b3c273de6
permissions	-rw-r--r--