hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@4e88a33d7972

     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     private 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 p = CLS.prototype = ").

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

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

   104         } else {

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

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

   107         }

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

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

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

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

   112                 "name", "value"

   113             );

   114             if (only != null) {

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

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

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

   118                 }

   119                 continue;

   120             }

   121             if (m.isStatic()) {

   122                 generateStaticMethod("\n    c.", m, toInitilize);

   123             } else {

   124                 generateInstanceMethod("\n    c.", m);

   125             }

   126         }

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

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

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

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

   131         }

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

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

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

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

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

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

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

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

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

   141                 "name", "value"

   142             );

   143             if (only != null) {

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

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

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

   147                 }

   148                 continue;

   149             }

   150             if (!v.isStatic()) {

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

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

   153             }

   154         }

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

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

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

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

   159         StringBuilder sb = new StringBuilder();

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

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

   162         }

   163         return sb.toString();

   164     }

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

   166         if (javaScriptBody(prefix, m, true)) {

   167             return;

   168         }

   169         StringBuilder argsCnt = new StringBuilder();

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

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

   172         if (mn.equals("classV")) {

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

   174         }

   175         out.append('(');

   176         String space = "";

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

   178             out.append(space);

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

   180             space = ",";

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

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

   183                 index += 2;

   184             } else {

   185                 index++;

   186             }

   187         }

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

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

   190         if (code != null) {

   191             int len = m.getMaxLocals();

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

   193                 out.append("  var ");

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

   195             }

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

   197             produceCode(code);

   198         } else {

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

   200         }

   201         out.append("};");

   202     }

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

   205         if (javaScriptBody(prefix, m, false)) {

   206             return;

   207         }

   208         StringBuilder argsCnt = new StringBuilder();

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

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

   211         out.append("(arg0");

   212         String space = ",";

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

   214             out.append(space);

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

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

   217                 index += 2;

   218             } else {

   219                 index++;

   220             }

   221         }

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

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

   224         if (code != null) {

   225             int len = m.getMaxLocals();

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

   227                 out.append("  var ");

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

   229             }

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

   231             produceCode(code);

   232         } else {

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

   234         }

   235         out.append("};");

   236     }

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

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

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

   241             int prev = i;

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

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

   244             switch (c) {

   245                 case opc_aload_0:

   246                 case opc_iload_0:

   247                 case opc_lload_0:

   248                 case opc_fload_0:

   249                 case opc_dload_0:

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

   251                     break;

   252                 case opc_aload_1:

   253                 case opc_iload_1:

   254                 case opc_lload_1:

   255                 case opc_fload_1:

   256                 case opc_dload_1:

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

   258                     break;

   259                 case opc_aload_2:

   260                 case opc_iload_2:

   261                 case opc_lload_2:

   262                 case opc_fload_2:

   263                 case opc_dload_2:

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

   265                     break;

   266                 case opc_aload_3:

   267                 case opc_iload_3:

   268                 case opc_lload_3:

   269                 case opc_fload_3:

   270                 case opc_dload_3:

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

   272                     break;

   273                 case opc_iload:

   274                 case opc_lload:

   275                 case opc_fload:

   276                 case opc_dload:

   277                 case opc_aload: {

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

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

   280                     break;

   281                 }

   282                 case opc_istore:

   283                 case opc_lstore:

   284                 case opc_fstore:

   285                 case opc_dstore:

   286                 case opc_astore: {

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

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

   289                     break;

   290                 }

   291                 case opc_astore_0:

   292                 case opc_istore_0:

   293                 case opc_lstore_0:

   294                 case opc_fstore_0:

   295                 case opc_dstore_0:

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

   297                     break;

   298                 case opc_astore_1:

   299                 case opc_istore_1:

   300                 case opc_lstore_1:

   301                 case opc_fstore_1:

   302                 case opc_dstore_1:

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

   304                     break;

   305                 case opc_astore_2:

   306                 case opc_istore_2:

   307                 case opc_lstore_2:

   308                 case opc_fstore_2:

   309                 case opc_dstore_2:

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

   311                     break;

   312                 case opc_astore_3:

   313                 case opc_istore_3:

   314                 case opc_lstore_3:

   315                 case opc_fstore_3:

   316                 case opc_dstore_3:

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

   318                     break;

   319                 case opc_iadd:

   320                 case opc_ladd:

   321                 case opc_fadd:

   322                 case opc_dadd:

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

   324                     break;

   325                 case opc_isub:

   326                 case opc_lsub:

   327                 case opc_fsub:

   328                 case opc_dsub:

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

   330                     break;

   331                 case opc_imul:

   332                 case opc_lmul:

   333                 case opc_fmul:

   334                 case opc_dmul:

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

   336                     break;

   337                 case opc_idiv:

   338                 case opc_ldiv:

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

   340                     break;

   341                 case opc_fdiv:

   342                 case opc_ddiv:

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

   344                     break;

   345                 case opc_irem:

   346                 case opc_lrem:

   347                 case opc_frem:

   348                 case opc_drem:

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

   350                     break;

   351                 case opc_iand:

   352                 case opc_land:

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

   354                     break;

   355                 case opc_ior:

   356                 case opc_lor:

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

   358                     break;

   359                 case opc_ixor:

   360                 case opc_lxor:

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

   362                     break;

   363                 case opc_ineg:

   364                 case opc_lneg:

   365                 case opc_fneg:

   366                 case opc_dneg:

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

   368                     break;

   369                 case opc_ishl:

   370                 case opc_lshl:

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

   372                     break;

   373                 case opc_ishr:

   374                 case opc_lshr:

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

   376                     break;

   377                 case opc_iushr:

   378                 case opc_lushr:

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

   380                     break;

   381                 case opc_iinc: {

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

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

   384                     if (incrBy == 1) {

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

   386                     } else {

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

   388                     }

   389                     break;

   390                 }

   391                 case opc_return:

   392                     out.append("return;");

   393                     break;

   394                 case opc_ireturn:

   395                 case opc_lreturn:

   396                 case opc_freturn:

   397                 case opc_dreturn:

   398                 case opc_areturn:

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

   400                     break;

   401                 case opc_i2l:

   402                 case opc_i2f:

   403                 case opc_i2d:

   404                 case opc_l2i:

   405                     // max int check?

   406                 case opc_l2f:

   407                 case opc_l2d:

   408                 case opc_f2d:

   409                 case opc_d2f:

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

   411                     break;

   412                 case opc_f2i:

   413                 case opc_f2l:

   414                 case opc_d2i:

   415                 case opc_d2l:

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

   417                     break;

   418                 case opc_i2b:

   419                 case opc_i2c:

   420                 case opc_i2s:

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

   422                     break;

   423                 case opc_aconst_null:

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

   425                     break;

   426                 case opc_iconst_m1:

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

   428                     break;

   429                 case opc_iconst_0:

   430                 case opc_dconst_0:

   431                 case opc_lconst_0:

   432                 case opc_fconst_0:

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

   434                     break;

   435                 case opc_iconst_1:

   436                 case opc_lconst_1:

   437                 case opc_fconst_1:

   438                 case opc_dconst_1:

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

   440                     break;

   441                 case opc_iconst_2:

   442                 case opc_fconst_2:

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

   444                     break;

   445                 case opc_iconst_3:

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

   447                     break;

   448                 case opc_iconst_4:

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

   450                     break;

   451                 case opc_iconst_5:

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

   453                     break;

   454                 case opc_ldc: {

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

   456                     String v = encodeConstant(indx);

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

   458                     break;

   459                 }

   460                 case opc_ldc_w:

   461                 case opc_ldc2_w: {

   462                     int indx = readIntArg(byteCodes, i);

   463                     i += 2;

   464                     String v = encodeConstant(indx);

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

   466                     break;

   467                 }

   468                 case opc_lcmp:

   469                 case opc_fcmpl:

   470                 case opc_fcmpg:

   471                 case opc_dcmpl:

   472                 case opc_dcmpg: {

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

   474                     break;

   475                 }

   476                 case opc_if_acmpeq:

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

   478                     break;

   479                 case opc_if_acmpne:

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

   481                     break;

   482                 case opc_if_icmpeq: {

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

   484                     break;

   485                 }

   486                 case opc_ifeq: {

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

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

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

   490                     i += 2;

   491                     break;

   492                 }

   493                 case opc_ifne: {

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

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

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

   497                     i += 2;

   498                     break;

   499                 }

   500                 case opc_iflt: {

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

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

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

   504                     i += 2;

   505                     break;

   506                 }

   507                 case opc_ifle: {

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

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

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

   511                     i += 2;

   512                     break;

   513                 }

   514                 case opc_ifgt: {

   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_ifge: {

   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_ifnonnull: {

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

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

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

   532                     i += 2;

   533                     break;

   534                 }

   535                 case opc_ifnull: {

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

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

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

   539                     i += 2;

   540                     break;

   541                 }

   542                 case opc_if_icmpne:

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

   544                     break;

   545                 case opc_if_icmplt:

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

   547                     break;

   548                 case opc_if_icmple:

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

   550                     break;

   551                 case opc_if_icmpgt:

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

   553                     break;

   554                 case opc_if_icmpge:

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

   556                     break;

   557                 case opc_goto: {

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

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

   560                     i += 2;

   561                     break;

   562                 }

   563                 case opc_lookupswitch: {

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

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

   566                     table += 4;

   567                     int n = readInt4(byteCodes, table);

   568                     table += 4;

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

   570                     while (n-- > 0) {

   571                         int cnstnt = readInt4(byteCodes, table);

   572                         table += 4;

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

   574                         table += 4;

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

   576                     }

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

   578                     i = table - 1;

   579                     break;

   580                 }

   581                 case opc_tableswitch: {

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

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

   584                     table += 4;

   585                     int low = readInt4(byteCodes, table);

   586                     table += 4;

   587                     int high = readInt4(byteCodes, table);

   588                     table += 4;

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

   590                     while (low <= high) {

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

   592                         table += 4;

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

   594                         low++;

   595                     }

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

   597                     i = table - 1;

   598                     break;

   599                 }

   600                 case opc_invokeinterface: {

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

   602                     break;

   603                 }

   604                 case opc_invokevirtual:

   605                     i = invokeVirtualMethod(byteCodes, i);

   606                     break;

   607                 case opc_invokespecial:

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

   609                     break;

   610                 case opc_invokestatic:

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

   612                     break;

   613                 case opc_new: {

   614                     int indx = readIntArg(byteCodes, i);

   615                     String ci = jc.getClassName(indx);

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

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

   618                     out.append("());");

   619                     addReference(ci);

   620                     i += 2;

   621                     break;

   622                 }

   623                 case opc_newarray: {

   624                     int type = byteCodes[i++];

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

   626                     break;

   627                 }

   628                 case opc_anewarray: {

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

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

   631                     break;

   632                 }

   633                 case opc_multianewarray: {

   634                     i += 2;

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

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

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

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

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

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

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

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

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

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

   645                             append(";");

   646                     }

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

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

   649                     }

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

   651                     break;

   652                 }

   653                 case opc_arraylength:

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

   655                     break;

   656                 case opc_iastore:

   657                 case opc_lastore:

   658                 case opc_fastore:

   659                 case opc_dastore:

   660                 case opc_aastore:

   661                 case opc_bastore:

   662                 case opc_castore:

   663                 case opc_sastore: {

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

   665                     break;

   666                 }

   667                 case opc_iaload:

   668                 case opc_laload:

   669                 case opc_faload:

   670                 case opc_daload:

   671                 case opc_aaload:

   672                 case opc_baload:

   673                 case opc_caload:

   674                 case opc_saload: {

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

   676                     break;

   677                 }

   678                 case opc_pop2:

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

   680                 case opc_pop:

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

   682                     break;

   683                 case opc_dup:

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

   685                     break;

   686                 case opc_dup_x1:

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

   688                     break;

   689                 case opc_dup_x2:

   690                     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); }");

   691                     break;

   692                 case opc_bipush:

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

   694                     break;

   695                 case opc_sipush:

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

   697                     i += 2;

   698                     break;

   699                 case opc_getfield: {

   700                     int indx = readIntArg(byteCodes, i);

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

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

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

   704                     i += 2;

   705                     break;

   706                 }

   707                 case opc_getstatic: {

   708                     int indx = readIntArg(byteCodes, i);

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

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

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

   712                     i += 2;

   713                     addReference(fi[0]);

   714                     break;

   715                 }

   716                 case opc_putstatic: {

   717                     int indx = readIntArg(byteCodes, i);

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

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

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

   721                     i += 2;

   722                     addReference(fi[0]);

   723                     break;

   724                 }

   725                 case opc_putfield: {

   726                     int indx = readIntArg(byteCodes, i);

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

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

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

   730                     i += 2;

   731                     break;

   732                 }

   733                 case opc_checkcast: {

   734                     int indx = readIntArg(byteCodes, i);

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

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

   737                         // no way to check arrays right now

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

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

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

   741                     }

   742                     i += 2;

   743                     break;

   744                 }

   745                 case opc_instanceof: {

   746                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   751                     i += 2;

   752                     break;

   753                 }

   754                 case opc_athrow: {

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

   756                     break;

   757                 }

   758                 default: {

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

   760                 }

   762             }

   763             out.append(" //");

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

   765                 out.append(" ");

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

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

   768             }

   769             out.append("\n");

   770         }

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

   772     }

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

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

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

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

   778         return i + 2;

   779     }

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

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

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

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

   785     }

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

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

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

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

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

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

   792     }

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

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

   795     }

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

   798         int i = 0;

   799         Boolean count = null;

   800         boolean array = false;

   801         int firstPos = sig.length();

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

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

   804             switch (ch) {

   805                 case '(':

   806                     count = true;

   807                     continue;

   808                 case ')':

   809                     count = false;

   810                     continue;

   811                 case 'A':

   812                     array = true;

   813                     break;

   814                 case 'B':

   815                 case 'C':

   816                 case 'D':

   817                 case 'F':

   818                 case 'I':

   819                 case 'J':

   820                 case 'S':

   821                 case 'Z':

   822                     if (count) {

   823                         if (array) {

   824                             sig.append('A');

   825                         }

   826                         sig.append(ch);

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

   828                             cnt.append('1');

   829                         } else {

   830                             cnt.append('0');

   831                         }

   832                     } else {

   833                         hasReturnType[0] = true;

   834                         sig.insert(firstPos, ch);

   835                         if (array) {

   836                             sig.insert(firstPos, 'A');

   837                         }

   838                     }

   839                     array = false;

   840                     continue;

   841                 case 'V':

   842                     assert !count;

   843                     hasReturnType[0] = false;

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

   845                     continue;

   846                 case 'L':

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

   848                     if (count) {

   849                         if (array) {

   850                             sig.append('A');

   851                         }

   852                         sig.append(ch);

   853                         sig.append(descriptor.substring(i, next).replace('/', '_'));

   854                         cnt.append('0');

   855                     } else {

   856                         sig.insert(firstPos, descriptor.substring(i, next).replace('/', '_'));

   857                         sig.insert(firstPos, ch);

   858                         if (array) {

   859                             sig.insert(firstPos, 'A');

   860                         }

   861                         hasReturnType[0] = true;

   862                     }

   863                     i = next + 1;

   864                     continue;

   865                 case '[':

   866                     //arrays++;

   867                     continue;

   868                 default:

   869                     break; // invalid character

   870             }

   871         }

   872     }

   874     private String findMethodName(MethodData m, StringBuilder cnt) {

   875         StringBuilder name = new StringBuilder();

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

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

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

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

   880         } else {

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

   882         }

   884         boolean hasReturn[] = { false };

   885         countArgs(findDescriptor(m.getInternalSig()), hasReturn, name, cnt);

   886         return name.toString();

   887     }

   889     private String findMethodName(String[] mi, StringBuilder cnt, boolean[] hasReturn) {

   890         StringBuilder name = new StringBuilder();

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

   892         String nm= mi[1];

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

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

   895         } else {

   896             name.append(nm);

   897         }

   898         countArgs(findDescriptor(descr), hasReturn, name, cnt);

   899         return name.toString();

   900     }

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

   903     throws IOException {

   904         int methodIndex = readIntArg(byteCodes, i);

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

   906         boolean[] hasReturn = { false };

   907         StringBuilder cnt = new StringBuilder();

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

   909         out.append("{ ");

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

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

   912         }

   914         if (hasReturn[0]) {

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

   916         }

   917         final String in = mi[0];

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

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

   920         out.append(mn);

   921         out.append('(');

   922         String sep = "";

   923         if (!isStatic) {

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

   925             sep = ", ";

   926         }

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

   928             out.append(sep);

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

   930             sep = ", ";

   931         }

   932         out.append(")");

   933         if (hasReturn[0]) {

   934             out.append(")");

   935         }

   936         out.append("; }");

   937         i += 2;

   938         addReference(in);

   939         return i;

   940     }

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

   942     throws IOException {

   943         int methodIndex = readIntArg(byteCodes, i);

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

   945         boolean[] hasReturn = { false };

   946         StringBuilder cnt = new StringBuilder();

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

   948         out.append("{ ");

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

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

   951         }

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

   953         if (hasReturn[0]) {

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

   955         }

   956         out.append("self.");

   957         out.append(mn);

   958         out.append('(');

   959         out.append("self");

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

   961             out.append(", ");

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

   963         }

   964         out.append(")");

   965         if (hasReturn[0]) {

   966             out.append(")");

   967         }

   968         out.append("; }");

   969         i += 2;

   970         return i;

   971     }

   973     private void addReference(String cn) throws IOException {

   974         if (requireReference(cn)) {

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

   976         }

   977     }

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

   980         int arr = 0;

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

   982             out.append('A');

   983             d = d.substring(1);

   984         }

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

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

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

   988         } else {

   989             out.append(d);

   990         }

   991     }

   993     private String encodeConstant(int entryIndex) {

   994         String s = jc.stringValue(entryIndex, true);

   995         return s;

   996     }

   998     private String findDescriptor(String d) {

   999         return d.replace('[', 'A');

  1000     }

  1002     private boolean javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1003         byte[] arr = m.findAnnotationData(true);

  1004         if (arr == null) {

  1005             return false;

  1006         }

  1007         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1008         class P extends AnnotationParser {

  1009             int cnt;

  1010             String[] args = new String[30];

  1011             String body;

  1013             @Override

  1014             protected void visitAttr(String type, String attr, String value) {

  1015                 if (type.equals(jvmType)) {

  1016                     if ("body".equals(attr)) {

  1017                         body = value;

  1018                     } else if ("args".equals(attr)) {

  1019                         args[cnt++] = value;

  1020                     } else {

  1021                         throw new IllegalArgumentException(attr);

  1022                     }

  1023                 }

  1024             }

  1025         }

  1026         P p = new P();

  1027         p.parse(arr, jc);

  1028         if (p.body == null) {

  1029             return false;

  1030         }

  1031         StringBuilder cnt = new StringBuilder();

  1032         out.append(prefix).append(findMethodName(m, cnt));

  1033         out.append(" = function(");

  1034         String space;

  1035         int index;

  1036         if (!isStatic) {

  1037             out.append(p.args[0]);

  1038             space = ",";

  1039             index = 1;

  1040         } else {

  1041             space = "";

  1042             index = 0;

  1043         }

  1044         for (int i = 0; i < cnt.length(); i++) {

  1045             out.append(space);

  1046             out.append(p.args[index]);

  1047             index++;

  1048             space = ",";

  1049         }

  1050         out.append(") {").append("\n");

  1051         out.append(p.body);

  1052         out.append("\n}\n");

  1053         return true;

  1054     }

  1055     private static String className(ClassData jc) {

  1056         //return jc.getName().getInternalName().replace('/', '_');

  1057         return jc.getClassName().replace('/', '_');

  1058     }

  1060     private static String[] findAnnotation(

  1061         byte[] arr, ClassData cd, final String className,

  1062         final String... attrNames

  1063     ) throws IOException {

  1064         if (arr == null) {

  1065             return null;

  1066         }

  1067         final String[] values = new String[attrNames.length];

  1068         final boolean[] found = { false };

  1069         final String jvmType = "L" + className.replace('.', '/') + ";";

  1070         AnnotationParser ap = new AnnotationParser() {

  1071             @Override

  1072             protected void visitAttr(String type, String attr, String value) {

  1073                 if (type.equals(jvmType)) {

  1074                     found[0] = true;

  1075                     for (int i = 0; i < attrNames.length; i++) {

  1076                         if (attrNames[i].equals(attr)) {

  1077                             values[i] = value;

  1078                         }

  1079                     }

  1080                 }

  1081             }

  1083         };

  1084         ap.parse(arr, cd);

  1085         return found[0] ? values : null;

  1086     }

  1088     private CharSequence initField(FieldData v) {

  1089         final String is = v.getInternalSig();

  1090         if (is.length() == 1) {

  1091             switch (is.charAt(0)) {

  1092                 case 'S':

  1093                 case 'J':

  1094                 case 'B':

  1095                 case 'Z':

  1096                 case 'C':

  1097                 case 'I': return " = 0;";

  1098                 case 'F':

  1099                 case 'D': return " = 0.0;";

  1100                 default:

  1101                     throw new IllegalStateException(is);

  1102             }

  1103         }

  1104         return " = null;";

  1105     }

  1106 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Sun, 02 Dec 2012 23:10:51 +0100
changeset 240	4e88a33d7972
parent 239	8ceee38f5840
child 242	8bd4adaf6590
child 248	0bfcb6585290
permissions	-rw-r--r--