hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@885acca2fa0b

     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 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     }

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

    63         return classOperation;

    64     }

    66     /**

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

    68      *

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

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

    71      *

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

    73      */

    75     public String compile(InputStream classFile) throws IOException {

    76         this.jc = new ClassData(classFile);

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

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

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

    80             "resource", "processByteCode"

    81         );

    82         if (arr != null) {

    83             requireScript(arr[0]);

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

    85                 return null;

    86             }

    87         }

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

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

    90             "container", "prototype"

    91         );

    92         StringArray toInitilize = new StringArray();

    93         final String className = className(jc);

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

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

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

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

    98             if (v.isStatic()) {

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

   100             }

   101         }

   102         if (proto == null) {

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

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

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

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

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

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

   109         } else {

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

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

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

   113         }

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

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

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

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

   118                 "name", "value"

   119             );

   120             if (only != null) {

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

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

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

   124                 }

   125                 continue;

   126             }

   127             String mn;

   128             if (m.isStatic()) {

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

   130             } else {

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

   132             }

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

   134             if (runAnno != null) {

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

   136                 generateAnno(jc, out, runAnno);

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

   138             }

   139         }

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

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

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

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

   144         }

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

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

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

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

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

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

   151         if (classAnno != null) {

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

   153             generateAnno(jc, out, classAnno);

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

   155         }

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

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

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

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

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

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

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

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

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

   165                 "name", "value"

   166             );

   167             if (only != null) {

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

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

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

   171                 }

   172                 continue;

   173             }

   174             if (!v.isStatic()) {

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

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

   177             }

   178         }

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

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

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

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

   183         StringBuilder sb = new StringBuilder();

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

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

   186         }

   187         return sb.toString();

   188     }

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

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

   191         if (jsb != null) {

   192             return jsb;

   193         }

   194         StringBuilder argsCnt = new StringBuilder();

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

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

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

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

   199         }

   200         out.append('(');

   201         String space = "";

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

   203             out.append(space);

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

   205             space = ",";

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

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

   208                 index += 2;

   209             } else {

   210                 index++;

   211             }

   212         }

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

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

   215         if (code != null) {

   216             int len = m.getMaxLocals();

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

   218                 out.append("  var ");

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

   220             }

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

   222             produceCode(code);

   223         } else {

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

   225         }

   226         out.append("};");

   227         return mn;

   228     }

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

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

   232         if (jsb != null) {

   233             return jsb;

   234         }

   235         StringBuilder argsCnt = new StringBuilder();

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

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

   238         out.append("(arg0");

   239         String space = ",";

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

   241             out.append(space);

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

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

   244                 index += 2;

   245             } else {

   246                 index++;

   247             }

   248         }

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

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

   251         if (code != null) {

   252             int len = m.getMaxLocals();

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

   254                 out.append("  var ");

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

   256             }

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

   258             produceCode(code);

   259         } else {

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

   261         }

   262         out.append("};");

   263         return mn;

   264     }

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

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

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

   269             int prev = i;

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

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

   272             switch (c) {

   273                 case opc_aload_0:

   274                 case opc_iload_0:

   275                 case opc_lload_0:

   276                 case opc_fload_0:

   277                 case opc_dload_0:

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

   279                     break;

   280                 case opc_aload_1:

   281                 case opc_iload_1:

   282                 case opc_lload_1:

   283                 case opc_fload_1:

   284                 case opc_dload_1:

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

   286                     break;

   287                 case opc_aload_2:

   288                 case opc_iload_2:

   289                 case opc_lload_2:

   290                 case opc_fload_2:

   291                 case opc_dload_2:

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

   293                     break;

   294                 case opc_aload_3:

   295                 case opc_iload_3:

   296                 case opc_lload_3:

   297                 case opc_fload_3:

   298                 case opc_dload_3:

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

   300                     break;

   301                 case opc_iload:

   302                 case opc_lload:

   303                 case opc_fload:

   304                 case opc_dload:

   305                 case opc_aload: {

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

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

   308                     break;

   309                 }

   310                 case opc_istore:

   311                 case opc_lstore:

   312                 case opc_fstore:

   313                 case opc_dstore:

   314                 case opc_astore: {

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

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

   317                     break;

   318                 }

   319                 case opc_astore_0:

   320                 case opc_istore_0:

   321                 case opc_lstore_0:

   322                 case opc_fstore_0:

   323                 case opc_dstore_0:

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

   325                     break;

   326                 case opc_astore_1:

   327                 case opc_istore_1:

   328                 case opc_lstore_1:

   329                 case opc_fstore_1:

   330                 case opc_dstore_1:

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

   332                     break;

   333                 case opc_astore_2:

   334                 case opc_istore_2:

   335                 case opc_lstore_2:

   336                 case opc_fstore_2:

   337                 case opc_dstore_2:

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

   339                     break;

   340                 case opc_astore_3:

   341                 case opc_istore_3:

   342                 case opc_lstore_3:

   343                 case opc_fstore_3:

   344                 case opc_dstore_3:

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

   346                     break;

   347                 case opc_iadd:

   348                 case opc_ladd:

   349                 case opc_fadd:

   350                 case opc_dadd:

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

   352                     break;

   353                 case opc_isub:

   354                 case opc_lsub:

   355                 case opc_fsub:

   356                 case opc_dsub:

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

   358                     break;

   359                 case opc_imul:

   360                 case opc_lmul:

   361                 case opc_fmul:

   362                 case opc_dmul:

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

   364                     break;

   365                 case opc_idiv:

   366                 case opc_ldiv:

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

   368                     break;

   369                 case opc_fdiv:

   370                 case opc_ddiv:

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

   372                     break;

   373                 case opc_irem:

   374                 case opc_lrem:

   375                 case opc_frem:

   376                 case opc_drem:

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

   378                     break;

   379                 case opc_iand:

   380                 case opc_land:

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

   382                     break;

   383                 case opc_ior:

   384                 case opc_lor:

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

   386                     break;

   387                 case opc_ixor:

   388                 case opc_lxor:

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

   390                     break;

   391                 case opc_ineg:

   392                 case opc_lneg:

   393                 case opc_fneg:

   394                 case opc_dneg:

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

   396                     break;

   397                 case opc_ishl:

   398                 case opc_lshl:

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

   400                     break;

   401                 case opc_ishr:

   402                 case opc_lshr:

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

   404                     break;

   405                 case opc_iushr:

   406                 case opc_lushr:

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

   408                     break;

   409                 case opc_iinc: {

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

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

   412                     if (incrBy == 1) {

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

   414                     } else {

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

   416                     }

   417                     break;

   418                 }

   419                 case opc_return:

   420                     out.append("return;");

   421                     break;

   422                 case opc_ireturn:

   423                 case opc_lreturn:

   424                 case opc_freturn:

   425                 case opc_dreturn:

   426                 case opc_areturn:

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

   428                     break;

   429                 case opc_i2l:

   430                 case opc_i2f:

   431                 case opc_i2d:

   432                 case opc_l2i:

   433                     // max int check?

   434                 case opc_l2f:

   435                 case opc_l2d:

   436                 case opc_f2d:

   437                 case opc_d2f:

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

   439                     break;

   440                 case opc_f2i:

   441                 case opc_f2l:

   442                 case opc_d2i:

   443                 case opc_d2l:

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

   445                     break;

   446                 case opc_i2b:

   447                 case opc_i2c:

   448                 case opc_i2s:

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

   450                     break;

   451                 case opc_aconst_null:

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

   453                     break;

   454                 case opc_iconst_m1:

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

   456                     break;

   457                 case opc_iconst_0:

   458                 case opc_dconst_0:

   459                 case opc_lconst_0:

   460                 case opc_fconst_0:

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

   462                     break;

   463                 case opc_iconst_1:

   464                 case opc_lconst_1:

   465                 case opc_fconst_1:

   466                 case opc_dconst_1:

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

   468                     break;

   469                 case opc_iconst_2:

   470                 case opc_fconst_2:

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

   472                     break;

   473                 case opc_iconst_3:

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

   475                     break;

   476                 case opc_iconst_4:

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

   478                     break;

   479                 case opc_iconst_5:

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

   481                     break;

   482                 case opc_ldc: {

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

   484                     String v = encodeConstant(indx);

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

   486                     break;

   487                 }

   488                 case opc_ldc_w:

   489                 case opc_ldc2_w: {

   490                     int indx = readIntArg(byteCodes, i);

   491                     i += 2;

   492                     String v = encodeConstant(indx);

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

   494                     break;

   495                 }

   496                 case opc_lcmp:

   497                 case opc_fcmpl:

   498                 case opc_fcmpg:

   499                 case opc_dcmpl:

   500                 case opc_dcmpg: {

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

   502                     break;

   503                 }

   504                 case opc_if_acmpeq:

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

   506                     break;

   507                 case opc_if_acmpne:

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

   509                     break;

   510                 case opc_if_icmpeq: {

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

   512                     break;

   513                 }

   514                 case opc_ifeq: {

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

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

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

   518                     i += 2;

   519                     break;

   520                 }

   521                 case opc_ifne: {

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

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

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

   525                     i += 2;

   526                     break;

   527                 }

   528                 case opc_iflt: {

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

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

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

   532                     i += 2;

   533                     break;

   534                 }

   535                 case opc_ifle: {

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

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

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

   539                     i += 2;

   540                     break;

   541                 }

   542                 case opc_ifgt: {

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

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

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

   546                     i += 2;

   547                     break;

   548                 }

   549                 case opc_ifge: {

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

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

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

   553                     i += 2;

   554                     break;

   555                 }

   556                 case opc_ifnonnull: {

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

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

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

   560                     i += 2;

   561                     break;

   562                 }

   563                 case opc_ifnull: {

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

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

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

   567                     i += 2;

   568                     break;

   569                 }

   570                 case opc_if_icmpne:

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

   572                     break;

   573                 case opc_if_icmplt:

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

   575                     break;

   576                 case opc_if_icmple:

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

   578                     break;

   579                 case opc_if_icmpgt:

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

   581                     break;

   582                 case opc_if_icmpge:

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

   584                     break;

   585                 case opc_goto: {

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

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

   588                     i += 2;

   589                     break;

   590                 }

   591                 case opc_lookupswitch: {

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

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

   594                     table += 4;

   595                     int n = readInt4(byteCodes, table);

   596                     table += 4;

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

   598                     while (n-- > 0) {

   599                         int cnstnt = readInt4(byteCodes, table);

   600                         table += 4;

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

   602                         table += 4;

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

   604                     }

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

   606                     i = table - 1;

   607                     break;

   608                 }

   609                 case opc_tableswitch: {

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

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

   612                     table += 4;

   613                     int low = readInt4(byteCodes, table);

   614                     table += 4;

   615                     int high = readInt4(byteCodes, table);

   616                     table += 4;

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

   618                     while (low <= high) {

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

   620                         table += 4;

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

   622                         low++;

   623                     }

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

   625                     i = table - 1;

   626                     break;

   627                 }

   628                 case opc_invokeinterface: {

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

   630                     break;

   631                 }

   632                 case opc_invokevirtual:

   633                     i = invokeVirtualMethod(byteCodes, i);

   634                     break;

   635                 case opc_invokespecial:

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

   637                     break;

   638                 case opc_invokestatic:

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

   640                     break;

   641                 case opc_new: {

   642                     int indx = readIntArg(byteCodes, i);

   643                     String ci = jc.getClassName(indx);

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

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

   646                     out.append("());");

   647                     addReference(ci);

   648                     i += 2;

   649                     break;

   650                 }

   651                 case opc_newarray: {

   652                     int type = byteCodes[i++];

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

   654                     break;

   655                 }

   656                 case opc_anewarray: {

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

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

   659                     break;

   660                 }

   661                 case opc_multianewarray: {

   662                     i += 2;

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

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

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

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

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

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

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

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

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

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

   673                             append(";");

   674                     }

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

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

   677                     }

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

   679                     break;

   680                 }

   681                 case opc_arraylength:

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

   683                     break;

   684                 case opc_iastore:

   685                 case opc_lastore:

   686                 case opc_fastore:

   687                 case opc_dastore:

   688                 case opc_aastore:

   689                 case opc_bastore:

   690                 case opc_castore:

   691                 case opc_sastore: {

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

   693                     break;

   694                 }

   695                 case opc_iaload:

   696                 case opc_laload:

   697                 case opc_faload:

   698                 case opc_daload:

   699                 case opc_aaload:

   700                 case opc_baload:

   701                 case opc_caload:

   702                 case opc_saload: {

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

   704                     break;

   705                 }

   706                 case opc_pop2:

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

   708                 case opc_pop:

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

   710                     break;

   711                 case opc_dup:

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

   713                     break;

   714                 case opc_dup_x1:

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

   716                     break;

   717                 case opc_dup_x2:

   718                     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); }");

   719                     break;

   720                 case opc_bipush:

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

   722                     break;

   723                 case opc_sipush:

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

   725                     i += 2;

   726                     break;

   727                 case opc_getfield: {

   728                     int indx = readIntArg(byteCodes, i);

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

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

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

   732                     i += 2;

   733                     break;

   734                 }

   735                 case opc_getstatic: {

   736                     int indx = readIntArg(byteCodes, i);

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

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

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

   740                     i += 2;

   741                     addReference(fi[0]);

   742                     break;

   743                 }

   744                 case opc_putstatic: {

   745                     int indx = readIntArg(byteCodes, i);

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

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

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

   749                     i += 2;

   750                     addReference(fi[0]);

   751                     break;

   752                 }

   753                 case opc_putfield: {

   754                     int indx = readIntArg(byteCodes, i);

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

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

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

   758                     i += 2;

   759                     break;

   760                 }

   761                 case opc_checkcast: {

   762                     int indx = readIntArg(byteCodes, i);

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

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

   765                         // no way to check arrays right now

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

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

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

   769                     }

   770                     i += 2;

   771                     break;

   772                 }

   773                 case opc_instanceof: {

   774                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   779                     i += 2;

   780                     break;

   781                 }

   782                 case opc_athrow: {

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

   784                     break;

   785                 }

   786                 default: {

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

   788                 }

   790             }

   791             out.append(" //");

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

   793                 out.append(" ");

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

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

   796             }

   797             out.append("\n");

   798         }

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

   800     }

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

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

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

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

   806         return i + 2;

   807     }

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

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

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

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

   813     }

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

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

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

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

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

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

   820     }

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

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

   823     }

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

   826         int i = 0;

   827         Boolean count = null;

   828         boolean array = false;

   829         sig.append("__");

   830         int firstPos = sig.length();

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

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

   833             switch (ch) {

   834                 case '(':

   835                     count = true;

   836                     continue;

   837                 case ')':

   838                     count = false;

   839                     continue;

   840                 case 'B':

   841                 case 'C':

   842                 case 'D':

   843                 case 'F':

   844                 case 'I':

   845                 case 'J':

   846                 case 'S':

   847                 case 'Z':

   848                     if (count) {

   849                         if (array) {

   850                             sig.append("_3");

   851                         }

   852                         sig.append(ch);

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

   854                             cnt.append('1');

   855                         } else {

   856                             cnt.append('0');

   857                         }

   858                     } else {

   859                         hasReturnType[0] = true;

   860                         sig.insert(firstPos, ch);

   861                         if (array) {

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

   863                         }

   864                     }

   865                     array = false;

   866                     continue;

   867                 case 'V':

   868                     assert !count;

   869                     hasReturnType[0] = false;

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

   871                     continue;

   872                 case 'L':

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

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

   875                     if (count) {

   876                         if (array) {

   877                             sig.append("_3");

   878                         }

   879                         sig.append(realSig);

   880                         cnt.append('0');

   881                     } else {

   882                         sig.insert(firstPos, realSig);

   883                         if (array) {

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

   885                         }

   886                         hasReturnType[0] = true;

   887                     }

   888                     i = next + 1;

   889                     continue;

   890                 case '[':

   891                     array = true;

   892                     continue;

   893                 default:

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

   895             }

   896         }

   897     }

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

   900         StringBuilder sb = new StringBuilder();

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

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

   903             switch (ch) {

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

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

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

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

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

   909             }

   910         }

   911         return sb.toString();

   912     }

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

   915         StringBuilder name = new StringBuilder();

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

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

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

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

   920         } else {

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

   922         }

   924         boolean hasReturn[] = { false };

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

   926         return name.toString();

   927     }

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

   930         StringBuilder name = new StringBuilder();

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

   932         String nm= mi[1];

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

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

   935         } else {

   936             name.append(nm);

   937         }

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

   939         return name.toString();

   940     }

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

   943     throws IOException {

   944         int methodIndex = readIntArg(byteCodes, i);

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

   946         boolean[] hasReturn = { false };

   947         StringBuilder cnt = new StringBuilder();

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

   949         out.append("{ ");

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

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

   952         }

   954         if (hasReturn[0]) {

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

   956         }

   957         final String in = mi[0];

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

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

   960         out.append(mn);

   961         out.append('(');

   962         String sep = "";

   963         if (!isStatic) {

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

   965             sep = ", ";

   966         }

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

   968             out.append(sep);

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

   970             sep = ", ";

   971         }

   972         out.append(")");

   973         if (hasReturn[0]) {

   974             out.append(")");

   975         }

   976         out.append("; }");

   977         i += 2;

   978         addReference(in);

   979         return i;

   980     }

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

   982     throws IOException {

   983         int methodIndex = readIntArg(byteCodes, i);

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

   985         boolean[] hasReturn = { false };

   986         StringBuilder cnt = new StringBuilder();

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

   988         out.append("{ ");

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

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

   991         }

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

   993         if (hasReturn[0]) {

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

   995         }

   996         out.append("self.");

   997         out.append(mn);

   998         out.append('(');

   999         out.append("self");

  1000         for (int j = 0; j < cnt.length(); j++) {

  1001             out.append(", ");

  1002             out.append("v" + j);

  1003         }

  1004         out.append(")");

  1005         if (hasReturn[0]) {

  1006             out.append(")");

  1007         }

  1008         out.append("; }");

  1009         i += 2;

  1010         return i;

  1011     }

  1013     private void addReference(String cn) throws IOException {

  1014         if (requireReference(cn)) {

  1015             out.append(" /* needs ").append(cn).append(" */");

  1016         }

  1017     }

  1019     private void outType(String d, StringBuilder out) {

  1020         int arr = 0;

  1021         while (d.charAt(0) == '[') {

  1022             out.append('A');

  1023             d = d.substring(1);

  1024         }

  1025         if (d.charAt(0) == 'L') {

  1026             assert d.charAt(d.length() - 1) == ';';

  1027             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1028         } else {

  1029             out.append(d);

  1030         }

  1031     }

  1033     private String encodeConstant(int entryIndex) throws IOException {

  1034         String[] classRef = { null };

  1035         String s = jc.stringValue(entryIndex, classRef);

  1036         if (classRef[0] != null) {

  1037             addReference(classRef[0]);

  1038             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1039         }

  1040         return s;

  1041     }

  1043     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1044         byte[] arr = m.findAnnotationData(true);

  1045         if (arr == null) {

  1046             return null;

  1047         }

  1048         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1049         class P extends AnnotationParser {

  1050             public P() {

  1051                 super(false);

  1052             }

  1054             int cnt;

  1055             String[] args = new String[30];

  1056             String body;

  1058             @Override

  1059             protected void visitAttr(String type, String attr, String at, String value) {

  1060                 if (type.equals(jvmType)) {

  1061                     if ("body".equals(attr)) {

  1062                         body = value;

  1063                     } else if ("args".equals(attr)) {

  1064                         args[cnt++] = value;

  1065                     } else {

  1066                         throw new IllegalArgumentException(attr);

  1067                     }

  1068                 }

  1069             }

  1070         }

  1071         P p = new P();

  1072         p.parse(arr, jc);

  1073         if (p.body == null) {

  1074             return null;

  1075         }

  1076         StringBuilder cnt = new StringBuilder();

  1077         final String mn = findMethodName(m, cnt);

  1078         out.append(prefix).append(mn);

  1079         out.append(" = function(");

  1080         String space;

  1081         int index;

  1082         if (!isStatic) {

  1083             out.append(p.args[0]);

  1084             space = ",";

  1085             index = 1;

  1086         } else {

  1087             space = "";

  1088             index = 0;

  1089         }

  1090         for (int i = 0; i < cnt.length(); i++) {

  1091             out.append(space);

  1092             out.append(p.args[index]);

  1093             index++;

  1094             space = ",";

  1095         }

  1096         out.append(") {").append("\n");

  1097         out.append(p.body);

  1098         out.append("\n}\n");

  1099         return mn;

  1100     }

  1101     private static String className(ClassData jc) {

  1102         //return jc.getName().getInternalName().replace('/', '_');

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

  1104     }

  1106     private static String[] findAnnotation(

  1107         byte[] arr, ClassData cd, final String className,

  1108         final String... attrNames

  1109     ) throws IOException {

  1110         if (arr == null) {

  1111             return null;

  1112         }

  1113         final String[] values = new String[attrNames.length];

  1114         final boolean[] found = { false };

  1115         final String jvmType = "L" + className.replace('.', '/') + ";";

  1116         AnnotationParser ap = new AnnotationParser(false) {

  1117             @Override

  1118             protected void visitAttr(String type, String attr, String at, String value) {

  1119                 if (type.equals(jvmType)) {

  1120                     found[0] = true;

  1121                     for (int i = 0; i < attrNames.length; i++) {

  1122                         if (attrNames[i].equals(attr)) {

  1123                             values[i] = value;

  1124                         }

  1125                     }

  1126                 }

  1127             }

  1129         };

  1130         ap.parse(arr, cd);

  1131         return found[0] ? values : null;

  1132     }

  1134     private CharSequence initField(FieldData v) {

  1135         final String is = v.getInternalSig();

  1136         if (is.length() == 1) {

  1137             switch (is.charAt(0)) {

  1138                 case 'S':

  1139                 case 'J':

  1140                 case 'B':

  1141                 case 'Z':

  1142                 case 'C':

  1143                 case 'I': return " = 0;";

  1144                 case 'F':

  1145                 case 'D': return " = 0.0;";

  1146                 default:

  1147                     throw new IllegalStateException(is);

  1148             }

  1149         }

  1150         return " = null;";

  1151     }

  1153     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1154         AnnotationParser ap = new AnnotationParser(true) {

  1155             int anno;

  1156             int cnt;

  1158             @Override

  1159             protected void visitAnnotationStart(String type) throws IOException {

  1160                 if (anno++ > 0) {

  1161                     out.append(",");

  1162                 }

  1163                 out.append('"').append(type).append("\" : {\n");

  1164                 cnt = 0;

  1165             }

  1167             @Override

  1168             protected void visitAnnotationEnd(String type) throws IOException {

  1169                 out.append("\n}\n");

  1170             }

  1172             @Override

  1173             protected void visitAttr(String type, String attr, String attrType, String value)

  1174             throws IOException {

  1175                 if (attr == null) {

  1176                     return;

  1177                 }

  1178                 if (cnt++ > 0) {

  1179                     out.append(",\n");

  1180                 }

  1181                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1182             }

  1183         };

  1184         ap.parse(data, cd);

  1185     }

  1186 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Tue, 11 Dec 2012 09:36:44 +0100
branch	lazyvm
changeset 298	885acca2fa0b
parent 274	81f6e7778135
child 303	c12342170235
permissions	-rw-r--r--