hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@70e7710a65dc

     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.bck2brwsr.core.ExtraJavaScript;

    23 import org.apidesign.bck2brwsr.core.JavaScriptBody;

    24 import sun.tools.javap.AnnotationParser;

    25 import sun.tools.javap.ClassData;

    26 import sun.tools.javap.FieldData;

    27 import sun.tools.javap.MethodData;

    28 import static sun.tools.javap.RuntimeConstants.*;

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

    31  *

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

    33  */

    34 public abstract class ByteCodeToJavaScript {

    35     private ClassData jc;

    36     private final Appendable out;

    38     protected ByteCodeToJavaScript(Appendable out) {

    39         this.out = out;

    40     }

    42     /* Collects additional required resources.

    43      *

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

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

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

    47      */

    48     protected abstract boolean requireReference(String internalClassName);

    50     /*

    51      * @param resourcePath name of resources to read

    52      */

    53     protected abstract void requireScript(String resourcePath);

    55     /**

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

    57      *

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

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

    60      *

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

    62      */

    64     public String compile(InputStream classFile) throws IOException {

    65         this.jc = new ClassData(classFile);

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

    67         String[] arr = findAnnotation(arrData, jc, ExtraJavaScript.class.getName(), "resource", "processByteCode");

    68         if (arr != null) {

    69             requireScript(arr[0]);

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

    71                 return null;

    72             }

    73         }

    74         StringArray toInitilize = new StringArray();

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

    76             if (m.isStatic()) {

    77                 generateStaticMethod(m, toInitilize);

    78             } else {

    79                 generateInstanceMethod(m);

    80             }

    81         }

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

    83             if (v.isStatic()) {

    84                 generateStaticField(v);

    85             }

    86         }

    88         final String className = className(jc);

    89         out.append("\nfunction ").append(className);

    90         out.append("() {");

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

    92             if (!v.isStatic()) {

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

    94                     append(v.getName()).append(" = 0;");

    95             }

    96         }

    97         out.append("\n}\n\nfunction ").append(className).append("_proto() {");

    98         out.append("\n  if (").append(className).

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

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

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

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

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

   104         if (sc != null) {

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

   106                .append(".prototype = ").

   107                 append(sc.replace('/', '_')).append("_proto();");

   108         } else {

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

   110         }

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

   112             if (!m.getName().contains("<init>") && !m.getName().contains("<cinit>")) {

   113                 generateMethodReference("\n  p.", m);

   114             }

   115         }

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

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

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

   119         }

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

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

   122         out.append("\n").append(className).append("_proto();");

   123         StringBuilder sb = new StringBuilder();

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

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

   126         }

   127         return sb.toString();

   128     }

   129     private void generateStaticMethod(MethodData m, StringArray toInitilize) throws IOException {

   130         if (javaScriptBody(m, true)) {

   131             return;

   132         }

   133         StringBuilder argsCnt = new StringBuilder();

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

   135         out.append("\nfunction ").append(

   136             className(jc)

   137         ).append('_').append(mn);

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

   139             toInitilize.add(className(jc) + '_' + mn);

   140         }

   141         out.append('(');

   142         String space = "";

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

   144             out.append(space);

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

   146             space = ",";

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

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

   149                 index += 2;

   150             } else {

   151                 index++;

   152             }

   153         }

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

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

   156         if (code != null) {

   157             int len = m.getMaxLocals();

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

   159                 out.append("  var ");

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

   161             }

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

   163             produceCode(code);

   164         } else {

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

   166         }

   167         out.append("}");

   168     }

   170     private void generateMethodReference(String prefix, MethodData m) throws IOException {

   171         final String name = findMethodName(m, new StringBuilder());

   172         out.append(prefix).append(name).append(" = ")

   173            .append(className(jc))

   174            .append('_').append(name).append(";");

   175     }

   177     private void generateInstanceMethod(MethodData m) throws IOException {

   178         if (javaScriptBody(m, false)) {

   179             return;

   180         }

   181         StringBuilder argsCnt = new StringBuilder();

   182         out.append("\nfunction ").append(

   183             className(jc)

   184         ).append('_').append(findMethodName(m, argsCnt));

   185         out.append("(arg0");

   186         String space = ",";

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

   188             out.append(space);

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

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

   191                 index += 2;

   192             } else {

   193                 index++;

   194             }

   195         }

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

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

   198         if (code != null) {

   199             int len = m.getMaxLocals();

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

   201                 out.append("  var ");

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

   203             }

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

   205             produceCode(code);

   206         } else {

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

   208         }

   209         out.append("}");

   210     }

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

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

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

   215             int prev = i;

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

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

   218             switch (c) {

   219                 case opc_aload_0:

   220                 case opc_iload_0:

   221                 case opc_lload_0:

   222                 case opc_fload_0:

   223                 case opc_dload_0:

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

   225                     break;

   226                 case opc_aload_1:

   227                 case opc_iload_1:

   228                 case opc_lload_1:

   229                 case opc_fload_1:

   230                 case opc_dload_1:

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

   232                     break;

   233                 case opc_aload_2:

   234                 case opc_iload_2:

   235                 case opc_lload_2:

   236                 case opc_fload_2:

   237                 case opc_dload_2:

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

   239                     break;

   240                 case opc_aload_3:

   241                 case opc_iload_3:

   242                 case opc_lload_3:

   243                 case opc_fload_3:

   244                 case opc_dload_3:

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

   246                     break;

   247                 case opc_iload:

   248                 case opc_lload:

   249                 case opc_fload:

   250                 case opc_dload:

   251                 case opc_aload: {

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

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

   254                     break;

   255                 }

   256                 case opc_istore:

   257                 case opc_lstore:

   258                 case opc_fstore:

   259                 case opc_dstore:

   260                 case opc_astore: {

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

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

   263                     break;

   264                 }

   265                 case opc_astore_0:

   266                 case opc_istore_0:

   267                 case opc_lstore_0:

   268                 case opc_fstore_0:

   269                 case opc_dstore_0:

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

   271                     break;

   272                 case opc_astore_1:

   273                 case opc_istore_1:

   274                 case opc_lstore_1:

   275                 case opc_fstore_1:

   276                 case opc_dstore_1:

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

   278                     break;

   279                 case opc_astore_2:

   280                 case opc_istore_2:

   281                 case opc_lstore_2:

   282                 case opc_fstore_2:

   283                 case opc_dstore_2:

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

   285                     break;

   286                 case opc_astore_3:

   287                 case opc_istore_3:

   288                 case opc_lstore_3:

   289                 case opc_fstore_3:

   290                 case opc_dstore_3:

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

   292                     break;

   293                 case opc_iadd:

   294                 case opc_ladd:

   295                 case opc_fadd:

   296                 case opc_dadd:

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

   298                     break;

   299                 case opc_isub:

   300                 case opc_lsub:

   301                 case opc_fsub:

   302                 case opc_dsub:

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

   304                     break;

   305                 case opc_imul:

   306                 case opc_lmul:

   307                 case opc_fmul:

   308                 case opc_dmul:

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

   310                     break;

   311                 case opc_idiv:

   312                 case opc_ldiv:

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

   314                     break;

   315                 case opc_fdiv:

   316                 case opc_ddiv:

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

   318                     break;

   319                 case opc_iand:

   320                 case opc_land:

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

   322                     break;

   323                 case opc_ior:

   324                 case opc_lor:

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

   326                     break;

   327                 case opc_ixor:

   328                 case opc_lxor:

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

   330                     break;

   331                 case opc_ineg:

   332                 case opc_lneg:

   333                 case opc_fneg:

   334                 case opc_dneg:

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

   336                     break;

   337                 case opc_ishl:

   338                 case opc_lshl:

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

   340                     break;

   341                 case opc_ishr:

   342                 case opc_lshr:

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

   344                     break;

   345                 case opc_iushr:

   346                 case opc_lushr:

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

   348                     break;

   349                 case opc_iinc: {

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

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

   352                     if (incrBy == 1) {

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

   354                     } else {

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

   356                     }

   357                     break;

   358                 }

   359                 case opc_return:

   360                     out.append("return;");

   361                     break;

   362                 case opc_ireturn:

   363                 case opc_lreturn:

   364                 case opc_freturn:

   365                 case opc_dreturn:

   366                 case opc_areturn:

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

   368                     break;

   369                 case opc_i2l:

   370                 case opc_i2f:

   371                 case opc_i2d:

   372                 case opc_l2i:

   373                     // max int check?

   374                 case opc_l2f:

   375                 case opc_l2d:

   376                 case opc_f2d:

   377                 case opc_d2f:

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

   379                     break;

   380                 case opc_f2i:

   381                 case opc_f2l:

   382                 case opc_d2i:

   383                 case opc_d2l:

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

   385                     break;

   386                 case opc_i2b:

   387                 case opc_i2c:

   388                 case opc_i2s:

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

   390                     break;

   391                 case opc_aconst_null:

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

   393                     break;

   394                 case opc_iconst_m1:

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

   396                     break;

   397                 case opc_iconst_0:

   398                 case opc_dconst_0:

   399                 case opc_lconst_0:

   400                 case opc_fconst_0:

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

   402                     break;

   403                 case opc_iconst_1:

   404                 case opc_lconst_1:

   405                 case opc_fconst_1:

   406                 case opc_dconst_1:

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

   408                     break;

   409                 case opc_iconst_2:

   410                 case opc_fconst_2:

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

   412                     break;

   413                 case opc_iconst_3:

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

   415                     break;

   416                 case opc_iconst_4:

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

   418                     break;

   419                 case opc_iconst_5:

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

   421                     break;

   422                 case opc_ldc: {

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

   424                     String v = encodeConstant(indx);

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

   426                     break;

   427                 }

   428                 case opc_ldc_w:

   429                 case opc_ldc2_w: {

   430                     int indx = readIntArg(byteCodes, i);

   431                     i += 2;

   432                     String v = encodeConstant(indx);

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

   434                     break;

   435                 }

   436                 case opc_lcmp:

   437                 case opc_fcmpl:

   438                 case opc_fcmpg:

   439                 case opc_dcmpl:

   440                 case opc_dcmpg: {

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

   442                     break;

   443                 }

   444                 case opc_if_acmpeq:

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

   446                     break;

   447                 case opc_if_acmpne:

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

   449                     break;

   450                 case opc_if_icmpeq: {

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

   452                     break;

   453                 }

   454                 case opc_ifeq: {

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

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

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

   458                     i += 2;

   459                     break;

   460                 }

   461                 case opc_ifne: {

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

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

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

   465                     i += 2;

   466                     break;

   467                 }

   468                 case opc_iflt: {

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

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

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

   472                     i += 2;

   473                     break;

   474                 }

   475                 case opc_ifle: {

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

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

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

   479                     i += 2;

   480                     break;

   481                 }

   482                 case opc_ifgt: {

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

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

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

   486                     i += 2;

   487                     break;

   488                 }

   489                 case opc_ifge: {

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

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

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

   493                     i += 2;

   494                     break;

   495                 }

   496                 case opc_ifnonnull: {

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

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

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

   500                     i += 2;

   501                     break;

   502                 }

   503                 case opc_ifnull: {

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

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

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

   507                     i += 2;

   508                     break;

   509                 }

   510                 case opc_if_icmpne:

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

   512                     break;

   513                 case opc_if_icmplt:

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

   515                     break;

   516                 case opc_if_icmple:

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

   518                     break;

   519                 case opc_if_icmpgt:

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

   521                     break;

   522                 case opc_if_icmpge:

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

   524                     break;

   525                 case opc_goto: {

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

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

   528                     i += 2;

   529                     break;

   530                 }

   531                 case opc_lookupswitch: {

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

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

   534                     table += 4;

   535                     int n = readInt4(byteCodes, table);

   536                     table += 4;

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

   538                     while (n-- > 0) {

   539                         int cnstnt = readInt4(byteCodes, table);

   540                         table += 4;

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

   542                         table += 4;

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

   544                     }

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

   546                     i = table - 1;

   547                     break;

   548                 }

   549                 case opc_tableswitch: {

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

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

   552                     table += 4;

   553                     int low = readInt4(byteCodes, table);

   554                     table += 4;

   555                     int high = readInt4(byteCodes, table);

   556                     table += 4;

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

   558                     while (low <= high) {

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

   560                         table += 4;

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

   562                         low++;

   563                     }

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

   565                     i = table - 1;

   566                     break;

   567                 }

   568                 case opc_invokeinterface: {

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

   570                     break;

   571                 }

   572                 case opc_invokevirtual:

   573                     i = invokeVirtualMethod(byteCodes, i);

   574                     break;

   575                 case opc_invokespecial:

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

   577                     break;

   578                 case opc_invokestatic:

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

   580                     break;

   581                 case opc_new: {

   582                     int indx = readIntArg(byteCodes, i);

   583                     String ci = jc.getClassName(indx);

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

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

   586                     out.append(");");

   587                     addReference(ci);

   588                     i += 2;

   589                     break;

   590                 }

   591                 case opc_newarray: {

   592                     int type = byteCodes[i++];

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

   594                     break;

   595                 }

   596                 case opc_anewarray: {

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

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

   599                     break;

   600                 }

   601                 case opc_multianewarray: {

   602                     i += 2;

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

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

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

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

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

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

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

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

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

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

   613                             append(";");

   614                     }

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

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

   617                     }

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

   619                     break;

   620                 }

   621                 case opc_arraylength:

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

   623                     break;

   624                 case opc_iastore:

   625                 case opc_lastore:

   626                 case opc_fastore:

   627                 case opc_dastore:

   628                 case opc_aastore:

   629                 case opc_bastore:

   630                 case opc_castore:

   631                 case opc_sastore: {

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

   633                     break;

   634                 }

   635                 case opc_iaload:

   636                 case opc_laload:

   637                 case opc_faload:

   638                 case opc_daload:

   639                 case opc_aaload:

   640                 case opc_baload:

   641                 case opc_caload:

   642                 case opc_saload: {

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

   644                     break;

   645                 }

   646                 case opc_pop2:

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

   648                 case opc_pop:

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

   650                     break;

   651                 case opc_dup:

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

   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("\nvar ")

   838            .append(className(jc))

   839            .append('_').append(v.getName()).append(" = 0;");

   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         if (isStatic) {

   888             out.append(".prototype.");

   889         } else {

   890             out.append('_');

   891         }

   892         out.append(mn);

   893         out.append('(');

   894         String sep = "";

   895         if (!isStatic) {

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

   897             sep = ", ";

   898         }

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

   900             out.append(sep);

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

   902             sep = ", ";

   903         }

   904         out.append(")");

   905         if (hasReturn[0]) {

   906             out.append(")");

   907         }

   908         out.append("; }");

   909         i += 2;

   910         addReference(in);

   911         return i;

   912     }

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

   914     throws IOException {

   915         int methodIndex = readIntArg(byteCodes, i);

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

   917         boolean[] hasReturn = { false };

   918         StringBuilder cnt = new StringBuilder();

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

   920         out.append("{ ");

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

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

   923         }

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

   925         if (hasReturn[0]) {

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

   927         }

   928         out.append("self.");

   929         out.append(mn);

   930         out.append('(');

   931         out.append("self");

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

   933             out.append(", ");

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

   935         }

   936         out.append(")");

   937         if (hasReturn[0]) {

   938             out.append(")");

   939         }

   940         out.append("; }");

   941         i += 2;

   942         return i;

   943     }

   945     private void addReference(String cn) throws IOException {

   946         if (requireReference(cn)) {

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

   948         }

   949     }

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

   952         int arr = 0;

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

   954             out.append('A');

   955             d = d.substring(1);

   956         }

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

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

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

   960         } else {

   961             out.append(d);

   962         }

   963     }

   965     private String encodeConstant(int entryIndex) {

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

   967         return s;

   968     }

   970     private String findDescriptor(String d) {

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

   972     }

   974     private boolean javaScriptBody(MethodData m, boolean isStatic) throws IOException {

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

   976         if (arr == null) {

   977             return false;

   978         }

   979         final String jvmType = "L" + JavaScriptBody.class.getName().replace('.', '/') + ";";

   980         class P extends AnnotationParser {

   981             int cnt;

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

   983             String body;

   985             @Override

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

   987                 if (type.equals(jvmType)) {

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

   989                         body = value;

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

   991                         args[cnt++] = value;

   992                     } else {

   993                         throw new IllegalArgumentException(attr);

   994                     }

   995                 }

   996             }

   997         }

   998         P p = new P();

   999         p.parse(arr, jc);

  1000         if (p.body == null) {

  1001             return false;

  1002         }

  1003         StringBuilder cnt = new StringBuilder();

  1004         out.append("\nfunction ").append(className(jc)).append('_').

  1005             append(findMethodName(m, cnt));

  1006         out.append("(");

  1007         String space;

  1008         int index;

  1009         if (!isStatic) {

  1010             out.append(p.args[0]);

  1011             space = ",";

  1012             index = 1;

  1013         } else {

  1014             space = "";

  1015             index = 0;

  1016         }

  1017         for (int i = 0; i < cnt.length(); i++) {

  1018             out.append(space);

  1019             out.append(p.args[index]);

  1020             index++;

  1021             space = ",";

  1022         }

  1023         out.append(") {").append("\n");

  1024         out.append(p.body);

  1025         out.append("\n}\n");

  1026         return true;

  1027     }

  1028     private static String className(ClassData jc) {

  1029         //return jc.getName().getInternalName().replace('/', '_');

  1030         return jc.getClassName().replace('/', '_');

  1031     }

  1033     private static String[] findAnnotation(

  1034         byte[] arr, ClassData cd, final String className,

  1035         final String... attrNames

  1036     ) throws IOException {

  1037         if (arr == null) {

  1038             return null;

  1039         }

  1040         final String[] values = new String[attrNames.length];

  1041         final boolean[] found = { false };

  1042         final String jvmType = "L" + className.replace('.', '/') + ";";

  1043         AnnotationParser ap = new AnnotationParser() {

  1044             @Override

  1045             protected void visitAttr(String type, String attr, String value) {

  1046                 if (type.equals(jvmType)) {

  1047                     found[0] = true;

  1048                     for (int i = 0; i < attrNames.length; i++) {

  1049                         if (attrNames[i].equals(attr)) {

  1050                             values[i] = value;

  1051                         }

  1052                     }

  1053                 }

  1054             }

  1056         };

  1057         ap.parse(arr, cd);

  1058         return found[0] ? values : null;

  1059     }

  1060 }

author	Jaroslav Tulach <jtulach@netbeans.org>
	Fri, 16 Nov 2012 07:36:32 +0100
branch	javap
changeset 162	70e7710a65dc
parent 156	3bb1a148a795
child 167	77f7135b6eb1
permissions	-rw-r--r--