hg/bck2brwsr: vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java@8da329789435

     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.JavaScriptBody;

    23 import org.apidesign.javap.AnnotationParser;

    24 import org.apidesign.javap.ClassData;

    25 import org.apidesign.javap.FieldData;

    26 import org.apidesign.javap.MethodData;

    27 import static org.apidesign.javap.RuntimeConstants.*;

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

    30  *

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

    32  */

    33 abstract class ByteCodeToJavaScript {

    34     private ClassData jc;

    35     final Appendable out;

    37     protected ByteCodeToJavaScript(Appendable out) {

    38         this.out = out;

    39     }

    41     /* Collects additional required resources.

    42      *

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

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

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

    46      */

    47     protected abstract boolean requireReference(String internalClassName);

    49     /*

    50      * @param resourcePath name of resources to read

    51      */

    52     protected abstract void requireScript(String resourcePath);

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

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

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

    57      *

    58      * @param className suggested name of the class

    59      */

    60     /* protected */ String assignClass(String className) {

    61         return className + " = ";

    62     }

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

    64         return classOperation;

    65     }

    67     /**

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

    69      *

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

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

    72      *

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

    74      */

    76     public String compile(InputStream classFile) throws IOException {

    77         this.jc = new ClassData(classFile);

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

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

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

    81             "resource", "processByteCode"

    82         );

    83         if (arr != null) {

    84             requireScript(arr[0]);

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

    86                 return null;

    87             }

    88         }

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

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

    91             "container", "prototype"

    92         );

    93         StringArray toInitilize = new StringArray();

    94         final String className = className(jc);

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

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

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

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

    99             if (v.isStatic()) {

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

   101             }

   102         }

   103         if (proto == null) {

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

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

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

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

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

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

   110         } else {

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

   112             if (proto[0] == null) {

   113                 proto[0] = "p";

   114             }

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

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

   117         }

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

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

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

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

   122                 "name", "value"

   123             );

   124             if (only != null) {

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

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

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

   128                 }

   129                 continue;

   130             }

   131             String mn;

   132             if (m.isStatic()) {

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

   134             } else {

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

   136             }

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

   138             if (runAnno != null) {

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

   140                 generateAnno(jc, out, runAnno);

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

   142             }

   143         }

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

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

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

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

   148         }

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

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

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

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

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

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

   155         if (classAnno != null) {

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

   157             generateAnno(jc, out, classAnno);

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

   159         }

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

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

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

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

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

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

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

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

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

   169                 "name", "value"

   170             );

   171             if (only != null) {

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

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

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

   175                 }

   176                 continue;

   177             }

   178             if (!v.isStatic()) {

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

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

   181             }

   182         }

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

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

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

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

   187         StringBuilder sb = new StringBuilder();

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

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

   190         }

   191         return sb.toString();

   192     }

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

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

   195         if (jsb != null) {

   196             return jsb;

   197         }

   198         StringBuilder argsCnt = new StringBuilder();

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

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

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

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

   203         }

   204         out.append('(');

   205         String space = "";

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

   207             out.append(space);

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

   209             space = ",";

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

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

   212                 index += 2;

   213             } else {

   214                 index++;

   215             }

   216         }

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

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

   219         if (code != null) {

   220             int len = m.getMaxLocals();

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

   222                 out.append("  var ");

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

   224             }

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

   226             produceCode(code);

   227         } else {

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

   229         }

   230         out.append("};");

   231         return mn;

   232     }

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

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

   236         if (jsb != null) {

   237             return jsb;

   238         }

   239         StringBuilder argsCnt = new StringBuilder();

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

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

   242         out.append("(arg0");

   243         String space = ",";

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

   245             out.append(space);

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

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

   248                 index += 2;

   249             } else {

   250                 index++;

   251             }

   252         }

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

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

   255         if (code != null) {

   256             int len = m.getMaxLocals();

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

   258                 out.append("  var ");

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

   260             }

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

   262             produceCode(code);

   263         } else {

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

   265         }

   266         out.append("};");

   267         return mn;

   268     }

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

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

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

   273             int prev = i;

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

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

   276             switch (c) {

   277                 case opc_aload_0:

   278                 case opc_iload_0:

   279                 case opc_lload_0:

   280                 case opc_fload_0:

   281                 case opc_dload_0:

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

   283                     break;

   284                 case opc_aload_1:

   285                 case opc_iload_1:

   286                 case opc_lload_1:

   287                 case opc_fload_1:

   288                 case opc_dload_1:

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

   290                     break;

   291                 case opc_aload_2:

   292                 case opc_iload_2:

   293                 case opc_lload_2:

   294                 case opc_fload_2:

   295                 case opc_dload_2:

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

   297                     break;

   298                 case opc_aload_3:

   299                 case opc_iload_3:

   300                 case opc_lload_3:

   301                 case opc_fload_3:

   302                 case opc_dload_3:

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

   304                     break;

   305                 case opc_iload:

   306                 case opc_lload:

   307                 case opc_fload:

   308                 case opc_dload:

   309                 case opc_aload: {

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

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

   312                     break;

   313                 }

   314                 case opc_istore:

   315                 case opc_lstore:

   316                 case opc_fstore:

   317                 case opc_dstore:

   318                 case opc_astore: {

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

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

   321                     break;

   322                 }

   323                 case opc_astore_0:

   324                 case opc_istore_0:

   325                 case opc_lstore_0:

   326                 case opc_fstore_0:

   327                 case opc_dstore_0:

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

   329                     break;

   330                 case opc_astore_1:

   331                 case opc_istore_1:

   332                 case opc_lstore_1:

   333                 case opc_fstore_1:

   334                 case opc_dstore_1:

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

   336                     break;

   337                 case opc_astore_2:

   338                 case opc_istore_2:

   339                 case opc_lstore_2:

   340                 case opc_fstore_2:

   341                 case opc_dstore_2:

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

   343                     break;

   344                 case opc_astore_3:

   345                 case opc_istore_3:

   346                 case opc_lstore_3:

   347                 case opc_fstore_3:

   348                 case opc_dstore_3:

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

   350                     break;

   351                 case opc_iadd:

   352                 case opc_ladd:

   353                 case opc_fadd:

   354                 case opc_dadd:

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

   356                     break;

   357                 case opc_isub:

   358                 case opc_lsub:

   359                 case opc_fsub:

   360                 case opc_dsub:

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

   362                     break;

   363                 case opc_imul:

   364                 case opc_lmul:

   365                 case opc_fmul:

   366                 case opc_dmul:

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

   368                     break;

   369                 case opc_idiv:

   370                 case opc_ldiv:

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

   372                     break;

   373                 case opc_fdiv:

   374                 case opc_ddiv:

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

   376                     break;

   377                 case opc_irem:

   378                 case opc_lrem:

   379                 case opc_frem:

   380                 case opc_drem:

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

   382                     break;

   383                 case opc_iand:

   384                 case opc_land:

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

   386                     break;

   387                 case opc_ior:

   388                 case opc_lor:

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

   390                     break;

   391                 case opc_ixor:

   392                 case opc_lxor:

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

   394                     break;

   395                 case opc_ineg:

   396                 case opc_lneg:

   397                 case opc_fneg:

   398                 case opc_dneg:

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

   400                     break;

   401                 case opc_ishl:

   402                 case opc_lshl:

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

   404                     break;

   405                 case opc_ishr:

   406                 case opc_lshr:

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

   408                     break;

   409                 case opc_iushr:

   410                 case opc_lushr:

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

   412                     break;

   413                 case opc_iinc: {

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

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

   416                     if (incrBy == 1) {

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

   418                     } else {

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

   420                     }

   421                     break;

   422                 }

   423                 case opc_return:

   424                     out.append("return;");

   425                     break;

   426                 case opc_ireturn:

   427                 case opc_lreturn:

   428                 case opc_freturn:

   429                 case opc_dreturn:

   430                 case opc_areturn:

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

   432                     break;

   433                 case opc_i2l:

   434                 case opc_i2f:

   435                 case opc_i2d:

   436                 case opc_l2i:

   437                     // max int check?

   438                 case opc_l2f:

   439                 case opc_l2d:

   440                 case opc_f2d:

   441                 case opc_d2f:

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

   443                     break;

   444                 case opc_f2i:

   445                 case opc_f2l:

   446                 case opc_d2i:

   447                 case opc_d2l:

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

   449                     break;

   450                 case opc_i2b:

   451                 case opc_i2c:

   452                 case opc_i2s:

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

   454                     break;

   455                 case opc_aconst_null:

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

   457                     break;

   458                 case opc_iconst_m1:

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

   460                     break;

   461                 case opc_iconst_0:

   462                 case opc_dconst_0:

   463                 case opc_lconst_0:

   464                 case opc_fconst_0:

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

   466                     break;

   467                 case opc_iconst_1:

   468                 case opc_lconst_1:

   469                 case opc_fconst_1:

   470                 case opc_dconst_1:

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

   472                     break;

   473                 case opc_iconst_2:

   474                 case opc_fconst_2:

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

   476                     break;

   477                 case opc_iconst_3:

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

   479                     break;

   480                 case opc_iconst_4:

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

   482                     break;

   483                 case opc_iconst_5:

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

   485                     break;

   486                 case opc_ldc: {

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

   488                     String v = encodeConstant(indx);

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

   490                     break;

   491                 }

   492                 case opc_ldc_w:

   493                 case opc_ldc2_w: {

   494                     int indx = readIntArg(byteCodes, i);

   495                     i += 2;

   496                     String v = encodeConstant(indx);

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

   498                     break;

   499                 }

   500                 case opc_lcmp:

   501                 case opc_fcmpl:

   502                 case opc_fcmpg:

   503                 case opc_dcmpl:

   504                 case opc_dcmpg: {

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

   506                     break;

   507                 }

   508                 case opc_if_acmpeq:

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

   510                     break;

   511                 case opc_if_acmpne:

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

   513                     break;

   514                 case opc_if_icmpeq: {

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

   516                     break;

   517                 }

   518                 case opc_ifeq: {

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

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

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

   522                     i += 2;

   523                     break;

   524                 }

   525                 case opc_ifne: {

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

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

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

   529                     i += 2;

   530                     break;

   531                 }

   532                 case opc_iflt: {

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

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

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

   536                     i += 2;

   537                     break;

   538                 }

   539                 case opc_ifle: {

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

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

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

   543                     i += 2;

   544                     break;

   545                 }

   546                 case opc_ifgt: {

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

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

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

   550                     i += 2;

   551                     break;

   552                 }

   553                 case opc_ifge: {

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

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

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

   557                     i += 2;

   558                     break;

   559                 }

   560                 case opc_ifnonnull: {

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

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

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

   564                     i += 2;

   565                     break;

   566                 }

   567                 case opc_ifnull: {

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

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

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

   571                     i += 2;

   572                     break;

   573                 }

   574                 case opc_if_icmpne:

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

   576                     break;

   577                 case opc_if_icmplt:

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

   579                     break;

   580                 case opc_if_icmple:

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

   582                     break;

   583                 case opc_if_icmpgt:

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

   585                     break;

   586                 case opc_if_icmpge:

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

   588                     break;

   589                 case opc_goto: {

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

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

   592                     i += 2;

   593                     break;

   594                 }

   595                 case opc_lookupswitch: {

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

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

   598                     table += 4;

   599                     int n = readInt4(byteCodes, table);

   600                     table += 4;

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

   602                     while (n-- > 0) {

   603                         int cnstnt = readInt4(byteCodes, table);

   604                         table += 4;

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

   606                         table += 4;

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

   608                     }

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

   610                     i = table - 1;

   611                     break;

   612                 }

   613                 case opc_tableswitch: {

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

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

   616                     table += 4;

   617                     int low = readInt4(byteCodes, table);

   618                     table += 4;

   619                     int high = readInt4(byteCodes, table);

   620                     table += 4;

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

   622                     while (low <= high) {

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

   624                         table += 4;

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

   626                         low++;

   627                     }

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

   629                     i = table - 1;

   630                     break;

   631                 }

   632                 case opc_invokeinterface: {

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

   634                     break;

   635                 }

   636                 case opc_invokevirtual:

   637                     i = invokeVirtualMethod(byteCodes, i);

   638                     break;

   639                 case opc_invokespecial:

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

   641                     break;

   642                 case opc_invokestatic:

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

   644                     break;

   645                 case opc_new: {

   646                     int indx = readIntArg(byteCodes, i);

   647                     String ci = jc.getClassName(indx);

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

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

   650                     out.append("());");

   651                     addReference(ci);

   652                     i += 2;

   653                     break;

   654                 }

   655                 case opc_newarray: {

   656                     int type = byteCodes[i++];

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

   658                     break;

   659                 }

   660                 case opc_anewarray: {

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

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

   663                     break;

   664                 }

   665                 case opc_multianewarray: {

   666                     i += 2;

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

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

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

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

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

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

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

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

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

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

   677                             append(";");

   678                     }

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

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

   681                     }

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

   683                     break;

   684                 }

   685                 case opc_arraylength:

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

   687                     break;

   688                 case opc_iastore:

   689                 case opc_lastore:

   690                 case opc_fastore:

   691                 case opc_dastore:

   692                 case opc_aastore:

   693                 case opc_bastore:

   694                 case opc_castore:

   695                 case opc_sastore: {

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

   697                     break;

   698                 }

   699                 case opc_iaload:

   700                 case opc_laload:

   701                 case opc_faload:

   702                 case opc_daload:

   703                 case opc_aaload:

   704                 case opc_baload:

   705                 case opc_caload:

   706                 case opc_saload: {

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

   708                     break;

   709                 }

   710                 case opc_pop2:

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

   712                 case opc_pop:

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

   714                     break;

   715                 case opc_dup:

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

   717                     break;

   718                 case opc_dup_x1:

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

   720                     break;

   721                 case opc_dup_x2:

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

   723                     break;

   724                 case opc_bipush:

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

   726                     break;

   727                 case opc_sipush:

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

   729                     i += 2;

   730                     break;

   731                 case opc_getfield: {

   732                     int indx = readIntArg(byteCodes, i);

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

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

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

   736                     i += 2;

   737                     break;

   738                 }

   739                 case opc_getstatic: {

   740                     int indx = readIntArg(byteCodes, i);

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

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

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

   744                     i += 2;

   745                     addReference(fi[0]);

   746                     break;

   747                 }

   748                 case opc_putstatic: {

   749                     int indx = readIntArg(byteCodes, i);

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

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

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

   753                     i += 2;

   754                     addReference(fi[0]);

   755                     break;

   756                 }

   757                 case opc_putfield: {

   758                     int indx = readIntArg(byteCodes, i);

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

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

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

   762                     i += 2;

   763                     break;

   764                 }

   765                 case opc_checkcast: {

   766                     int indx = readIntArg(byteCodes, i);

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

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

   769                         // no way to check arrays right now

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

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

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

   773                     }

   774                     i += 2;

   775                     break;

   776                 }

   777                 case opc_instanceof: {

   778                     int indx = readIntArg(byteCodes, i);

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

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

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

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

   783                     i += 2;

   784                     break;

   785                 }

   786                 case opc_athrow: {

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

   788                     break;

   789                 }

   790                 default: {

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

   792                 }

   794             }

   795             out.append(" //");

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

   797                 out.append(" ");

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

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

   800             }

   801             out.append("\n");

   802         }

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

   804     }

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

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

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

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

   810         return i + 2;

   811     }

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

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

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

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

   817     }

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

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

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

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

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

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

   824     }

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

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

   827     }

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

   830         int i = 0;

   831         Boolean count = null;

   832         boolean array = false;

   833         sig.append("__");

   834         int firstPos = sig.length();

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

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

   837             switch (ch) {

   838                 case '(':

   839                     count = true;

   840                     continue;

   841                 case ')':

   842                     count = false;

   843                     continue;

   844                 case 'B':

   845                 case 'C':

   846                 case 'D':

   847                 case 'F':

   848                 case 'I':

   849                 case 'J':

   850                 case 'S':

   851                 case 'Z':

   852                     if (count) {

   853                         if (array) {

   854                             sig.append("_3");

   855                         }

   856                         sig.append(ch);

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

   858                             cnt.append('1');

   859                         } else {

   860                             cnt.append('0');

   861                         }

   862                     } else {

   863                         hasReturnType[0] = true;

   864                         sig.insert(firstPos, ch);

   865                         if (array) {

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

   867                         }

   868                     }

   869                     array = false;

   870                     continue;

   871                 case 'V':

   872                     assert !count;

   873                     hasReturnType[0] = false;

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

   875                     continue;

   876                 case 'L':

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

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

   879                     if (count) {

   880                         if (array) {

   881                             sig.append("_3");

   882                         }

   883                         sig.append(realSig);

   884                         cnt.append('0');

   885                     } else {

   886                         sig.insert(firstPos, realSig);

   887                         if (array) {

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

   889                         }

   890                         hasReturnType[0] = true;

   891                     }

   892                     i = next + 1;

   893                     continue;

   894                 case '[':

   895                     array = true;

   896                     continue;

   897                 default:

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

   899             }

   900         }

   901     }

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

   904         StringBuilder sb = new StringBuilder();

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

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

   907             switch (ch) {

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

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

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

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

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

   913             }

   914         }

   915         return sb.toString();

   916     }

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

   919         StringBuilder name = new StringBuilder();

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

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

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

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

   924         } else {

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

   926         }

   928         boolean hasReturn[] = { false };

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

   930         return name.toString();

   931     }

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

   934         StringBuilder name = new StringBuilder();

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

   936         String nm= mi[1];

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

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

   939         } else {

   940             name.append(nm);

   941         }

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

   943         return name.toString();

   944     }

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

   947     throws IOException {

   948         int methodIndex = readIntArg(byteCodes, i);

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

   950         boolean[] hasReturn = { false };

   951         StringBuilder cnt = new StringBuilder();

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

   953         out.append("{ ");

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

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

   956         }

   958         if (hasReturn[0]) {

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

   960         }

   961         final String in = mi[0];

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

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

   964         out.append(mn);

   965         out.append('(');

   966         String sep = "";

   967         if (!isStatic) {

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

   969             sep = ", ";

   970         }

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

   972             out.append(sep);

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

   974             sep = ", ";

   975         }

   976         out.append(")");

   977         if (hasReturn[0]) {

   978             out.append(")");

   979         }

   980         out.append("; }");

   981         i += 2;

   982         addReference(in);

   983         return i;

   984     }

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

   986     throws IOException {

   987         int methodIndex = readIntArg(byteCodes, i);

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

   989         boolean[] hasReturn = { false };

   990         StringBuilder cnt = new StringBuilder();

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

   992         out.append("{ ");

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

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

   995         }

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

   997         if (hasReturn[0]) {

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

   999         }

  1000         out.append("self.");

  1001         out.append(mn);

  1002         out.append('(');

  1003         out.append("self");

  1004         for (int j = 0; j < cnt.length(); j++) {

  1005             out.append(", ");

  1006             out.append("v" + j);

  1007         }

  1008         out.append(")");

  1009         if (hasReturn[0]) {

  1010             out.append(")");

  1011         }

  1012         out.append("; }");

  1013         i += 2;

  1014         return i;

  1015     }

  1017     private void addReference(String cn) throws IOException {

  1018         if (requireReference(cn)) {

  1019             out.append(" /* needs ").append(cn).append(" */");

  1020         }

  1021     }

  1023     private void outType(String d, StringBuilder out) {

  1024         int arr = 0;

  1025         while (d.charAt(0) == '[') {

  1026             out.append('A');

  1027             d = d.substring(1);

  1028         }

  1029         if (d.charAt(0) == 'L') {

  1030             assert d.charAt(d.length() - 1) == ';';

  1031             out.append(d.replace('/', '_').substring(0, d.length() - 1));

  1032         } else {

  1033             out.append(d);

  1034         }

  1035     }

  1037     private String encodeConstant(int entryIndex) throws IOException {

  1038         String[] classRef = { null };

  1039         String s = jc.stringValue(entryIndex, classRef);

  1040         if (classRef[0] != null) {

  1041             addReference(classRef[0]);

  1042             s = accessClass(s.replace('/', '_')) + "(false).constructor.$class";

  1043         }

  1044         return s;

  1045     }

  1047     private String javaScriptBody(String prefix, MethodData m, boolean isStatic) throws IOException {

  1048         byte[] arr = m.findAnnotationData(true);

  1049         if (arr == null) {

  1050             return null;

  1051         }

  1052         final String jvmType = "Lorg/apidesign/bck2brwsr/core/JavaScriptBody;";

  1053         class P extends AnnotationParser {

  1054             public P() {

  1055                 super(false);

  1056             }

  1058             int cnt;

  1059             String[] args = new String[30];

  1060             String body;

  1062             @Override

  1063             protected void visitAttr(String type, String attr, String at, String value) {

  1064                 if (type.equals(jvmType)) {

  1065                     if ("body".equals(attr)) {

  1066                         body = value;

  1067                     } else if ("args".equals(attr)) {

  1068                         args[cnt++] = value;

  1069                     } else {

  1070                         throw new IllegalArgumentException(attr);

  1071                     }

  1072                 }

  1073             }

  1074         }

  1075         P p = new P();

  1076         p.parse(arr, jc);

  1077         if (p.body == null) {

  1078             return null;

  1079         }

  1080         StringBuilder cnt = new StringBuilder();

  1081         final String mn = findMethodName(m, cnt);

  1082         out.append(prefix).append(mn);

  1083         out.append(" = function(");

  1084         String space;

  1085         int index;

  1086         if (!isStatic) {

  1087             space = outputArg(out, p.args, 0);

  1088             index = 1;

  1089         } else {

  1090             space = "";

  1091             index = 0;

  1092         }

  1093         for (int i = 0; i < cnt.length(); i++) {

  1094             out.append(space);

  1095             space = outputArg(out, p.args, index);

  1096             index++;

  1097         }

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

  1099         out.append(p.body);

  1100         out.append("\n}\n");

  1101         return mn;

  1102     }

  1103     private static String className(ClassData jc) {

  1104         //return jc.getName().getInternalName().replace('/', '_');

  1105         return jc.getClassName().replace('/', '_');

  1106     }

  1108     private static String[] findAnnotation(

  1109         byte[] arr, ClassData cd, final String className,

  1110         final String... attrNames

  1111     ) throws IOException {

  1112         if (arr == null) {

  1113             return null;

  1114         }

  1115         final String[] values = new String[attrNames.length];

  1116         final boolean[] found = { false };

  1117         final String jvmType = "L" + className.replace('.', '/') + ";";

  1118         AnnotationParser ap = new AnnotationParser(false) {

  1119             @Override

  1120             protected void visitAttr(String type, String attr, String at, String value) {

  1121                 if (type.equals(jvmType)) {

  1122                     found[0] = true;

  1123                     for (int i = 0; i < attrNames.length; i++) {

  1124                         if (attrNames[i].equals(attr)) {

  1125                             values[i] = value;

  1126                         }

  1127                     }

  1128                 }

  1129             }

  1131         };

  1132         ap.parse(arr, cd);

  1133         return found[0] ? values : null;

  1134     }

  1136     private CharSequence initField(FieldData v) {

  1137         final String is = v.getInternalSig();

  1138         if (is.length() == 1) {

  1139             switch (is.charAt(0)) {

  1140                 case 'S':

  1141                 case 'J':

  1142                 case 'B':

  1143                 case 'Z':

  1144                 case 'C':

  1145                 case 'I': return " = 0;";

  1146                 case 'F':

  1147                 case 'D': return " = 0.0;";

  1148                 default:

  1149                     throw new IllegalStateException(is);

  1150             }

  1151         }

  1152         return " = null;";

  1153     }

  1155     private static void generateAnno(ClassData cd, final Appendable out, byte[] data) throws IOException {

  1156         AnnotationParser ap = new AnnotationParser(true) {

  1157             int anno;

  1158             int cnt;

  1160             @Override

  1161             protected void visitAnnotationStart(String type) throws IOException {

  1162                 if (anno++ > 0) {

  1163                     out.append(",");

  1164                 }

  1165                 out.append('"').append(type).append("\" : {\n");

  1166                 cnt = 0;

  1167             }

  1169             @Override

  1170             protected void visitAnnotationEnd(String type) throws IOException {

  1171                 out.append("\n}\n");

  1172             }

  1174             @Override

  1175             protected void visitAttr(String type, String attr, String attrType, String value)

  1176             throws IOException {

  1177                 if (attr == null) {

  1178                     return;

  1179                 }

  1180                 if (cnt++ > 0) {

  1181                     out.append(",\n");

  1182                 }

  1183                 out.append(attr).append("__").append(attrType).append(" : ").append(value);

  1184             }

  1185         };

  1186         ap.parse(data, cd);

  1187     }

  1189     private static String outputArg(Appendable out, String[] args, int indx) throws IOException {

  1190         final String name = args[indx];

  1191         if (name == null) {

  1192             return "";

  1193         }

  1194         if (name.contains(",")) {

  1195             throw new IOException("Wrong parameter with ',': " + name);

  1196         }

  1197         out.append(name);

  1198         return ",";

  1199     }

  1200 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Thu, 13 Dec 2012 23:20:47 +0100
changeset 316	8da329789435
parent 306	f36b3c273de6
child 317	15cbc8cb2163
permissions	-rw-r--r--