hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@ffb067aae3a9

     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     /**

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

    55      *

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

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

    58      *

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

    60      */

    62     public String compile(InputStream classFile) throws IOException {

    63         this.jc = new ClassData(classFile);

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

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

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

    67             "resource", "processByteCode"

    68         );

    69         if (arr != null) {

    70             requireScript(arr[0]);

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

    72                 return null;

    73             }

    74         }

    75         StringArray toInitilize = new StringArray();

    76         final String className = className(jc);

    77         out.append("\n\n").append(className);

    78         out.append(" = function() {");

    79         out.append("\n  if (!").append(className).

    80             append(".prototype.$instOf_").append(className).append(") {");

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

    82             if (v.isStatic()) {

    83                 generateStaticField(v);

    84             }

    85         }

    86         // ClassName sc = jc.getSuperClass();

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

    88         if (sc != null) {

    89             out.append("\n    var p = ").append(className)

    90                .append(".prototype = ").

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

    92         } else {

    93             out.append("\n    var p = ").append(className).append(".prototype;");

    94         }

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

    96             if (m.isStatic()) {

    97                 generateStaticMethod("\n    p.", m, toInitilize);

    98             } else {

    99                 generateInstanceMethod("\n    p.", m);

   100             }

   101         }

   102         out.append("\n    p.$instOf_").append(className).append(" = true;");

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

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

   105         }

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

   107         out.append("\n        return new ").append(className).append("();");

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

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

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

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

   112             if (!v.isStatic()) {

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

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

   115             }

   116         }

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

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

   119         out.append("\n  return new ").append(className).append(";");

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

   121         StringBuilder sb = new StringBuilder();

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

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

   124         }

   125         return sb.toString();

   126     }

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

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

   129             return;

   130         }

   131         StringBuilder argsCnt = new StringBuilder();

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

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

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

   135             toInitilize.add(className(jc) + "(true)." + mn);

   136         }

   137         out.append('(');

   138         String space = "";

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

   140             out.append(space);

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

   142             space = ",";

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

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

   145                 index += 2;

   146             } else {

   147                 index++;

   148             }

   149         }

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

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

   152         if (code != null) {

   153             int len = m.getMaxLocals();

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

   155                 out.append("  var ");

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

   157             }

   158             out.append("  var stack = new Array();\n");

   159             produceCode(code);

   160         } else {

   161             out.append("  /* no code found for ").append(m.getInternalSig()).append(" */\n");

   162         }

   163         out.append("};");

   164     }

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

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

   168             return;

   169         }

   170         StringBuilder argsCnt = new StringBuilder();

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

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

   173         out.append("(arg0");

   174         String space = ",";

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

   176             out.append(space);

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

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

   179                 index += 2;

   180             } else {

   181                 index++;

   182             }

   183         }

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

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

   186         if (code != null) {

   187             int len = m.getMaxLocals();

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

   189                 out.append("  var ");

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

   191             }

   192             out.append(";\n  var stack = new Array();\n");

   193             produceCode(code);

   194         } else {

   195             out.append("  /* no code found for ").append(m.getInternalSig()).append(" */\n");

   196         }

   197         out.append("};");

   198     }

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

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

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

   203             int prev = i;

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

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

   206             switch (c) {

   207                 case opc_aload_0:

   208                 case opc_iload_0:

   209                 case opc_lload_0:

   210                 case opc_fload_0:

   211                 case opc_dload_0:

   212                     out.append("stack.push(arg0);");

   213                     break;

   214                 case opc_aload_1:

   215                 case opc_iload_1:

   216                 case opc_lload_1:

   217                 case opc_fload_1:

   218                 case opc_dload_1:

   219                     out.append("stack.push(arg1);");

   220                     break;

   221                 case opc_aload_2:

   222                 case opc_iload_2:

   223                 case opc_lload_2:

   224                 case opc_fload_2:

   225                 case opc_dload_2:

   226                     out.append("stack.push(arg2);");

   227                     break;

   228                 case opc_aload_3:

   229                 case opc_iload_3:

   230                 case opc_lload_3:

   231                 case opc_fload_3:

   232                 case opc_dload_3:

   233                     out.append("stack.push(arg3);");

   234                     break;

   235                 case opc_iload:

   236                 case opc_lload:

   237                 case opc_fload:

   238                 case opc_dload:

   239                 case opc_aload: {

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

   241                     out.append("stack.push(arg").append(indx + ");");

   242                     break;

   243                 }

   244                 case opc_istore:

   245                 case opc_lstore:

   246                 case opc_fstore:

   247                 case opc_dstore:

   248                 case opc_astore: {

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

   250                     out.append("arg" + indx).append(" = stack.pop();");

   251                     break;

   252                 }

   253                 case opc_astore_0:

   254                 case opc_istore_0:

   255                 case opc_lstore_0:

   256                 case opc_fstore_0:

   257                 case opc_dstore_0:

   258                     out.append("arg0 = stack.pop();");

   259                     break;

   260                 case opc_astore_1:

   261                 case opc_istore_1:

   262                 case opc_lstore_1:

   263                 case opc_fstore_1:

   264                 case opc_dstore_1:

   265                     out.append("arg1 = stack.pop();");

   266                     break;

   267                 case opc_astore_2:

   268                 case opc_istore_2:

   269                 case opc_lstore_2:

   270                 case opc_fstore_2:

   271                 case opc_dstore_2:

   272                     out.append("arg2 = stack.pop();");

   273                     break;

   274                 case opc_astore_3:

   275                 case opc_istore_3:

   276                 case opc_lstore_3:

   277                 case opc_fstore_3:

   278                 case opc_dstore_3:

   279                     out.append("arg3 = stack.pop();");

   280                     break;

   281                 case opc_iadd:

   282                 case opc_ladd:

   283                 case opc_fadd:

   284                 case opc_dadd:

   285                     out.append("stack.push(stack.pop() + stack.pop());");

   286                     break;

   287                 case opc_isub:

   288                 case opc_lsub:

   289                 case opc_fsub:

   290                 case opc_dsub:

   291                     out.append("{ var tmp = stack.pop(); stack.push(stack.pop() - tmp); }");

   292                     break;

   293                 case opc_imul:

   294                 case opc_lmul:

   295                 case opc_fmul:

   296                 case opc_dmul:

   297                     out.append("stack.push(stack.pop() * stack.pop());");

   298                     break;

   299                 case opc_idiv:

   300                 case opc_ldiv:

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

   302                     break;

   303                 case opc_fdiv:

   304                 case opc_ddiv:

   305                     out.append("{ var tmp = stack.pop(); stack.push(stack.pop() / tmp); }");

   306                     break;

   307                 case opc_irem:

   308                 case opc_lrem:

   309                 case opc_frem:

   310                 case opc_drem:

   311                     out.append("{ var d = stack.pop(); stack.push(stack.pop() % d); }");

   312                     break;

   313                 case opc_iand:

   314                 case opc_land:

   315                     out.append("stack.push(stack.pop() & stack.pop());");

   316                     break;

   317                 case opc_ior:

   318                 case opc_lor:

   319                     out.append("stack.push(stack.pop() | stack.pop());");

   320                     break;

   321                 case opc_ixor:

   322                 case opc_lxor:

   323                     out.append("stack.push(stack.pop() ^ stack.pop());");

   324                     break;

   325                 case opc_ineg:

   326                 case opc_lneg:

   327                 case opc_fneg:

   328                 case opc_dneg:

   329                     out.append("stack.push(- stack.pop());");

   330                     break;

   331                 case opc_ishl:

   332                 case opc_lshl:

   333                     out.append("{ var v = stack.pop(); stack.push(stack.pop() << v); }");

   334                     break;

   335                 case opc_ishr:

   336                 case opc_lshr:

   337                     out.append("{ var v = stack.pop(); stack.push(stack.pop() >> v); }");

   338                     break;

   339                 case opc_iushr:

   340                 case opc_lushr:

   341                     out.append("{ var v = stack.pop(); stack.push(stack.pop() >>> v); }");

   342                     break;

   343                 case opc_iinc: {

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

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

   346                     if (incrBy == 1) {

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

   348                     } else {

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

   350                     }

   351                     break;

   352                 }

   353                 case opc_return:

   354                     out.append("return;");

   355                     break;

   356                 case opc_ireturn:

   357                 case opc_lreturn:

   358                 case opc_freturn:

   359                 case opc_dreturn:

   360                 case opc_areturn:

   361                     out.append("return stack.pop();");

   362                     break;

   363                 case opc_i2l:

   364                 case opc_i2f:

   365                 case opc_i2d:

   366                 case opc_l2i:

   367                     // max int check?

   368                 case opc_l2f:

   369                 case opc_l2d:

   370                 case opc_f2d:

   371                 case opc_d2f:

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

   373                     break;

   374                 case opc_f2i:

   375                 case opc_f2l:

   376                 case opc_d2i:

   377                 case opc_d2l:

   378                     out.append("stack.push(Math.floor(stack.pop()));");

   379                     break;

   380                 case opc_i2b:

   381                 case opc_i2c:

   382                 case opc_i2s:

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

   384                     break;

   385                 case opc_aconst_null:

   386                     out.append("stack.push(null);");

   387                     break;

   388                 case opc_iconst_m1:

   389                     out.append("stack.push(-1);");

   390                     break;

   391                 case opc_iconst_0:

   392                 case opc_dconst_0:

   393                 case opc_lconst_0:

   394                 case opc_fconst_0:

   395                     out.append("stack.push(0);");

   396                     break;

   397                 case opc_iconst_1:

   398                 case opc_lconst_1:

   399                 case opc_fconst_1:

   400                 case opc_dconst_1:

   401                     out.append("stack.push(1);");

   402                     break;

   403                 case opc_iconst_2:

   404                 case opc_fconst_2:

   405                     out.append("stack.push(2);");

   406                     break;

   407                 case opc_iconst_3:

   408                     out.append("stack.push(3);");

   409                     break;

   410                 case opc_iconst_4:

   411                     out.append("stack.push(4);");

   412                     break;

   413                 case opc_iconst_5:

   414                     out.append("stack.push(5);");

   415                     break;

   416                 case opc_ldc: {

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

   418                     String v = encodeConstant(indx);

   419                     out.append("stack.push(").append(v).append(");");

   420                     break;

   421                 }

   422                 case opc_ldc_w:

   423                 case opc_ldc2_w: {

   424                     int indx = readIntArg(byteCodes, i);

   425                     i += 2;

   426                     String v = encodeConstant(indx);

   427                     out.append("stack.push(").append(v).append(");");

   428                     break;

   429                 }

   430                 case opc_lcmp:

   431                 case opc_fcmpl:

   432                 case opc_fcmpg:

   433                 case opc_dcmpl:

   434                 case opc_dcmpg: {

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

   436                     break;

   437                 }

   438                 case opc_if_acmpeq:

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

   440                     break;

   441                 case opc_if_acmpne:

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

   443                     break;

   444                 case opc_if_icmpeq: {

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

   446                     break;

   447                 }

   448                 case opc_ifeq: {

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

   450                     out.append("if (stack.pop() == 0) { gt = " + indx);

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

   452                     i += 2;

   453                     break;

   454                 }

   455                 case opc_ifne: {

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

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

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

   459                     i += 2;

   460                     break;

   461                 }

   462                 case opc_iflt: {

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

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

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

   466                     i += 2;

   467                     break;

   468                 }

   469                 case opc_ifle: {

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

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

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

   473                     i += 2;

   474                     break;

   475                 }

   476                 case opc_ifgt: {

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

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

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

   480                     i += 2;

   481                     break;

   482                 }

   483                 case opc_ifge: {

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

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

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

   487                     i += 2;

   488                     break;

   489                 }

   490                 case opc_ifnonnull: {

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

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

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

   494                     i += 2;

   495                     break;

   496                 }

   497                 case opc_ifnull: {

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

   499                     out.append("if (stack.pop() === null) { gt = " + indx);

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

   501                     i += 2;

   502                     break;

   503                 }

   504                 case opc_if_icmpne:

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

   506                     break;

   507                 case opc_if_icmplt:

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

   509                     break;

   510                 case opc_if_icmple:

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

   512                     break;

   513                 case opc_if_icmpgt:

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

   515                     break;

   516                 case opc_if_icmpge:

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

   518                     break;

   519                 case opc_goto: {

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

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

   522                     i += 2;

   523                     break;

   524                 }

   525                 case opc_lookupswitch: {

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

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

   528                     table += 4;

   529                     int n = readInt4(byteCodes, table);

   530                     table += 4;

   531                     out.append("switch (stack.pop()) {\n");

   532                     while (n-- > 0) {

   533                         int cnstnt = readInt4(byteCodes, table);

   534                         table += 4;

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

   536                         table += 4;

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

   538                     }

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

   540                     i = table - 1;

   541                     break;

   542                 }

   543                 case opc_tableswitch: {

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

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

   546                     table += 4;

   547                     int low = readInt4(byteCodes, table);

   548                     table += 4;

   549                     int high = readInt4(byteCodes, table);

   550                     table += 4;

   551                     out.append("switch (stack.pop()) {\n");

   552                     while (low <= high) {

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

   554                         table += 4;

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

   556                         low++;

   557                     }

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

   559                     i = table - 1;

   560                     break;

   561                 }

   562                 case opc_invokeinterface: {

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

   564                     break;

   565                 }

   566                 case opc_invokevirtual:

   567                     i = invokeVirtualMethod(byteCodes, i);

   568                     break;

   569                 case opc_invokespecial:

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

   571                     break;

   572                 case opc_invokestatic:

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

   574                     break;

   575                 case opc_new: {

   576                     int indx = readIntArg(byteCodes, i);

   577                     String ci = jc.getClassName(indx);

   578                     out.append("stack.push(");

   579                     out.append("new ").append(ci.replace('/','_'));

   580                     out.append(");");

   581                     addReference(ci);

   582                     i += 2;

   583                     break;

   584                 }

   585                 case opc_newarray: {

   586                     int type = byteCodes[i++];

   587                     out.append("stack.push(new Array(stack.pop()).fillNulls());");

   588                     break;

   589                 }

   590                 case opc_anewarray: {

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

   592                     out.append("stack.push(new Array(stack.pop()).fillNulls());");

   593                     break;

   594                 }

   595                 case opc_multianewarray: {

   596                     i += 2;

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

   598                     out.append("{ var a0 = new Array(stack.pop()).fillNulls();");

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

   600                         out.append("\n  var l" + d).append(" = stack.pop();");

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

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

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

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

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

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

   607                             append(";");

   608                     }

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

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

   611                     }

   612                     out.append("\nstack.push(a0); }");

   613                     break;

   614                 }

   615                 case opc_arraylength:

   616                     out.append("stack.push(stack.pop().length);");

   617                     break;

   618                 case opc_iastore:

   619                 case opc_lastore:

   620                 case opc_fastore:

   621                 case opc_dastore:

   622                 case opc_aastore:

   623                 case opc_bastore:

   624                 case opc_castore:

   625                 case opc_sastore: {

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

   627                     break;

   628                 }

   629                 case opc_iaload:

   630                 case opc_laload:

   631                 case opc_faload:

   632                 case opc_daload:

   633                 case opc_aaload:

   634                 case opc_baload:

   635                 case opc_caload:

   636                 case opc_saload: {

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

   638                     break;

   639                 }

   640                 case opc_pop2:

   641                     out.append("stack.pop();");

   642                 case opc_pop:

   643                     out.append("stack.pop();");

   644                     break;

   645                 case opc_dup:

   646                     out.append("stack.push(stack[stack.length - 1]);");

   647                     break;

   648                 case opc_dup_x1:

   649                     out.append("{ var v1 = stack.pop(); var v2 = stack.pop(); stack.push(v1); stack.push(v2); stack.push(v1); }");

   650                     break;

   651                 case opc_dup_x2:

   652                     out.append("{ var v1 = stack.pop(); var v2 = stack.pop(); var v3 = stack.pop(); stack.push(v1); stack.push(v3); stack.push(v2); stack.push(v1); }");

   653                     break;

   654                 case opc_bipush:

   655                     out.append("stack.push(" + byteCodes[++i] + ");");

   656                     break;

   657                 case opc_sipush:

   658                     out.append("stack.push(" + readIntArg(byteCodes, i) + ");");

   659                     i += 2;

   660                     break;

   661                 case opc_getfield: {

   662                     int indx = readIntArg(byteCodes, i);

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

   664                     out.append("stack.push(stack.pop().fld_").

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

   666                     i += 2;

   667                     break;

   668                 }

   669                 case opc_getstatic: {

   670                     int indx = readIntArg(byteCodes, i);

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

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

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

   674                     i += 2;

   675                     addReference(fi[0]);

   676                     break;

   677                 }

   678                 case opc_putstatic: {

   679                     int indx = readIntArg(byteCodes, i);

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

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

   682                     out.append('.').append(fi[1]).append(" = stack.pop();");

   683                     i += 2;

   684                     addReference(fi[0]);

   685                     break;

   686                 }

   687                 case opc_putfield: {

   688                     int indx = readIntArg(byteCodes, i);

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

   690                     out.append("{ var v = stack.pop(); stack.pop().fld_")

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

   692                     i += 2;

   693                     break;

   694                 }

   695                 case opc_checkcast: {

   696                     int indx = readIntArg(byteCodes, i);

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

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

   699                         // no way to check arrays right now

   700                         out.append("if(stack[stack.length - 1].$instOf_")

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

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

   703                     }

   704                     i += 2;

   705                     break;

   706                 }

   707                 case opc_instanceof: {

   708                     int indx = readIntArg(byteCodes, i);

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

   710                     out.append("stack.push(stack.pop().$instOf_")

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

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

   713                     i += 2;

   714                     break;

   715                 }

   716                 case opc_athrow: {

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

   718                     break;

   719                 }

   720                 default: {

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

   722                 }

   724             }

   725             out.append(" //");

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

   727                 out.append(" ");

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

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

   730             }

   731             out.append("\n");

   732         }

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

   734     }

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

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

   738         out.append("if (stack.pop() ").append(test).append(" stack.pop()) { gt = " + indx);

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

   740         return i + 2;

   741     }

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

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

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

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

   747     }

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

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

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

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

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

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

   754     }

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

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

   757     }

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

   760         int i = 0;

   761         Boolean count = null;

   762         boolean array = false;

   763         int firstPos = sig.length();

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

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

   766             switch (ch) {

   767                 case '(':

   768                     count = true;

   769                     continue;

   770                 case ')':

   771                     count = false;

   772                     continue;

   773                 case 'A':

   774                     array = true;

   775                     break;

   776                 case 'B':

   777                 case 'C':

   778                 case 'D':

   779                 case 'F':

   780                 case 'I':

   781                 case 'J':

   782                 case 'S':

   783                 case 'Z':

   784                     if (count) {

   785                         if (array) {

   786                             sig.append('A');

   787                         }

   788                         sig.append(ch);

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

   790                             cnt.append('1');

   791                         } else {

   792                             cnt.append('0');

   793                         }

   794                     } else {

   795                         hasReturnType[0] = true;

   796                         sig.insert(firstPos, ch);

   797                         if (array) {

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

   799                         }

   800                     }

   801                     array = false;

   802                     continue;

   803                 case 'V':

   804                     assert !count;

   805                     hasReturnType[0] = false;

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

   807                     continue;

   808                 case 'L':

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

   810                     if (count) {

   811                         if (array) {

   812                             sig.append('A');

   813                         }

   814                         sig.append(ch);

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

   816                         cnt.append('0');

   817                     } else {

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

   819                         sig.insert(firstPos, ch);

   820                         if (array) {

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

   822                         }

   823                         hasReturnType[0] = true;

   824                     }

   825                     i = next + 1;

   826                     continue;

   827                 case '[':

   828                     //arrays++;

   829                     continue;

   830                 default:

   831                     break; // invalid character

   832             }

   833         }

   834     }

   836     private void generateStaticField(FieldData v) throws IOException {

   837         out.append("\n  ")

   838            .append(className(jc))

   839            .append('.').append(v.getName()).append(initField(v));

   840     }

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

   843         StringBuilder name = new StringBuilder();

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

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

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

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

   848         } else {

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

   850         }

   852         boolean hasReturn[] = { false };

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

   854         return name.toString();

   855     }

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

   858         StringBuilder name = new StringBuilder();

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

   860         String nm= mi[1];

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

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

   863         } else {

   864             name.append(nm);

   865         }

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

   867         return name.toString();

   868     }

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

   871     throws IOException {

   872         int methodIndex = readIntArg(byteCodes, i);

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

   874         boolean[] hasReturn = { false };

   875         StringBuilder cnt = new StringBuilder();

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

   877         out.append("{ ");

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

   879             out.append("var v" + j).append(" = stack.pop(); ");

   880         }

   882         if (hasReturn[0]) {

   883             out.append("stack.push(");

   884         }

   885         final String in = mi[0];

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

   887         out.append("(true).");

   888         out.append(mn);

   889         out.append('(');

   890         String sep = "";

   891         if (!isStatic) {

   892             out.append("stack.pop()");

   893             sep = ", ";

   894         }

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

   896             out.append(sep);

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

   898             sep = ", ";

   899         }

   900         out.append(")");

   901         if (hasReturn[0]) {

   902             out.append(")");

   903         }

   904         out.append("; }");

   905         i += 2;

   906         addReference(in);

   907         return i;

   908     }

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

   910     throws IOException {

   911         int methodIndex = readIntArg(byteCodes, i);

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

   913         boolean[] hasReturn = { false };

   914         StringBuilder cnt = new StringBuilder();

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

   916         out.append("{ ");

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

   918             out.append("var v" + j).append(" = stack.pop(); ");

   919         }

   920         out.append("var self = stack.pop(); ");

   921         if (hasReturn[0]) {

   922             out.append("stack.push(");

   923         }

   924         out.append("self.");

   925         out.append(mn);

   926         out.append('(');

   927         out.append("self");

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

   929             out.append(", ");

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

   931         }

   932         out.append(")");

   933         if (hasReturn[0]) {

   934             out.append(")");

   935         }

   936         out.append("; }");

   937         i += 2;

   938         return i;

   939     }

   941     private void addReference(String cn) throws IOException {

   942         if (requireReference(cn)) {

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

   944         }

   945     }

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

   948         int arr = 0;

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

   950             out.append('A');

   951             d = d.substring(1);

   952         }

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

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

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

   956         } else {

   957             out.append(d);

   958         }

   959     }

   961     private String encodeConstant(int entryIndex) {

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

   963         return s;

   964     }

   966     private String findDescriptor(String d) {

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

   968     }

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

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

   972         if (arr == null) {

   973             return false;

   974         }

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

   976         class P extends AnnotationParser {

   977             int cnt;

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

   979             String body;

   981             @Override

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

   983                 if (type.equals(jvmType)) {

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

   985                         body = value;

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

   987                         args[cnt++] = value;

   988                     } else {

   989                         throw new IllegalArgumentException(attr);

   990                     }

   991                 }

   992             }

   993         }

   994         P p = new P();

   995         p.parse(arr, jc);

   996         if (p.body == null) {

   997             return false;

   998         }

   999         StringBuilder cnt = new StringBuilder();

  1000         out.append(prefix).append(findMethodName(m, cnt));

  1001         out.append(" = function(");

  1002         String space;

  1003         int index;

  1004         if (!isStatic) {

  1005             out.append(p.args[0]);

  1006             space = ",";

  1007             index = 1;

  1008         } else {

  1009             space = "";

  1010             index = 0;

  1011         }

  1012         for (int i = 0; i < cnt.length(); i++) {

  1013             out.append(space);

  1014             out.append(p.args[index]);

  1015             index++;

  1016             space = ",";

  1017         }

  1018         out.append(") {").append("\n");

  1019         out.append(p.body);

  1020         out.append("\n}\n");

  1021         return true;

  1022     }

  1023     private static String className(ClassData jc) {

  1024         //return jc.getName().getInternalName().replace('/', '_');

  1025         return jc.getClassName().replace('/', '_');

  1026     }

  1028     private static String[] findAnnotation(

  1029         byte[] arr, ClassData cd, final String className,

  1030         final String... attrNames

  1031     ) throws IOException {

  1032         if (arr == null) {

  1033             return null;

  1034         }

  1035         final String[] values = new String[attrNames.length];

  1036         final boolean[] found = { false };

  1037         final String jvmType = "L" + className.replace('.', '/') + ";";

  1038         AnnotationParser ap = new AnnotationParser() {

  1039             @Override

  1040             protected void visitAttr(String type, String attr, String value) {

  1041                 if (type.equals(jvmType)) {

  1042                     found[0] = true;

  1043                     for (int i = 0; i < attrNames.length; i++) {

  1044                         if (attrNames[i].equals(attr)) {

  1045                             values[i] = value;

  1046                         }

  1047                     }

  1048                 }

  1049             }

  1051         };

  1052         ap.parse(arr, cd);

  1053         return found[0] ? values : null;

  1054     }

  1056     private CharSequence initField(FieldData v) {

  1057         final String is = v.getInternalSig();

  1058         if (is.length() == 1) {

  1059             switch (is.charAt(0)) {

  1060                 case 'S':

  1061                 case 'J':

  1062                 case 'B':

  1063                 case 'Z':

  1064                 case 'C':

  1065                 case 'I': return " = 0;";

  1066                 case 'F':

  1067                 case 'D': return " = 0.0;";

  1068                 default:

  1069                     throw new IllegalStateException(is);

  1070             }

  1071         }

  1072         return " = null;";

  1073     }

  1074 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Wed, 28 Nov 2012 00:25:57 +0100
branch	lazy
changeset 211	ffb067aae3a9
parent 210	66b552a2e108
child 213	9dc53108d3df
permissions	-rw-r--r--