1 /*
   2  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.tools.javac.jvm;
  27 
  28 import java.io.*;
  29 import java.util.LinkedHashMap;
  30 import java.util.Map;
  31 import java.util.Set;
  32 import java.util.HashSet;
  33 
  34 import javax.lang.model.type.TypeKind;
  35 import javax.tools.JavaFileManager;
  36 import javax.tools.FileObject;
  37 import javax.tools.JavaFileObject;
  38 
  39 import com.sun.tools.javac.code.*;
  40 import com.sun.tools.javac.code.Attribute.RetentionPolicy;
  41 import com.sun.tools.javac.code.Attribute.TypeCompound;
  42 import com.sun.tools.javac.code.Symbol.*;
  43 import com.sun.tools.javac.code.Type.*;
  44 import com.sun.tools.javac.code.Types.UniqueType;
  45 import com.sun.tools.javac.file.BaseFileObject;
  46 import com.sun.tools.javac.jvm.Pool.DynamicMethod;
  47 import com.sun.tools.javac.jvm.Pool.Method;
  48 import com.sun.tools.javac.jvm.Pool.MethodHandle;
  49 import com.sun.tools.javac.jvm.Pool.Variable;
  50 import com.sun.tools.javac.util.*;
  51 
  52 import static com.sun.tools.javac.code.Flags.*;
  53 import static com.sun.tools.javac.code.Kinds.*;
  54 import static com.sun.tools.javac.code.TypeTag.*;
  55 import static com.sun.tools.javac.jvm.UninitializedType.*;
  56 import static com.sun.tools.javac.main.Option.*;
  57 import static javax.tools.StandardLocation.CLASS_OUTPUT;
  58 
  59 
  60 /** This class provides operations to map an internal symbol table graph
  61  *  rooted in a ClassSymbol into a classfile.
  62  *
  63  *  <p><b>This is NOT part of any supported API.
  64  *  If you write code that depends on this, you do so at your own risk.
  65  *  This code and its internal interfaces are subject to change or
  66  *  deletion without notice.</b>
  67  */
  68 public class ClassWriter extends ClassFile {
  69     protected static final Context.Key<ClassWriter> classWriterKey =
  70         new Context.Key<ClassWriter>();
  71 
  72     private final Options options;
  73 
  74     /** Switch: verbose output.
  75      */
  76     private boolean verbose;
  77 
  78     /** Switch: scramble private field names.
  79      */
  80     private boolean scramble;
  81 
  82     /** Switch: scramble all field names.
  83      */
  84     private boolean scrambleAll;
  85 
  86     /** Switch: retrofit mode.
  87      */
  88     private boolean retrofit;
  89 
  90     /** Switch: emit source file attribute.
  91      */
  92     private boolean emitSourceFile;
  93 
  94     /** Switch: generate CharacterRangeTable attribute.
  95      */
  96     private boolean genCrt;
  97 
  98     /** Switch: describe the generated stackmap.
  99      */
 100     boolean debugstackmap;
 101 
 102     /**
 103      * Target class version.
 104      */
 105     private Target target;
 106 
 107     /**
 108      * Source language version.
 109      */
 110     private Source source;
 111 
 112     /** Type utilities. */
 113     private Types types;
 114 
 115     /** The initial sizes of the data and constant pool buffers.
 116      *  Sizes are increased when buffers get full.
 117      */
 118     static final int DATA_BUF_SIZE = 0x0fff0;
 119     static final int POOL_BUF_SIZE = 0x1fff0;
 120 
 121     /** An output buffer for member info.
 122      */
 123     ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE);
 124 
 125     /** An output buffer for the constant pool.
 126      */
 127     ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE);
 128 
 129     /** An output buffer for type signatures.
 130      */
 131     ByteBuffer sigbuf = new ByteBuffer();
 132 
 133     /** The constant pool.
 134      */
 135     Pool pool;
 136 
 137     /** The inner classes to be written, as a set.
 138      */
 139     Set<ClassSymbol> innerClasses;
 140 
 141     /** The inner classes to be written, as a queue where
 142      *  enclosing classes come first.
 143      */
 144     ListBuffer<ClassSymbol> innerClassesQueue;
 145 
 146     /** The bootstrap methods to be written in the corresponding class attribute
 147      *  (one for each invokedynamic)
 148      */
 149     Map<DynamicMethod, MethodHandle> bootstrapMethods;
 150 
 151     /** The log to use for verbose output.
 152      */
 153     private final Log log;
 154 
 155     /** The name table. */
 156     private final Names names;
 157 
 158     /** Access to files. */
 159     private final JavaFileManager fileManager;
 160 
 161     /** The tags and constants used in compressed stackmap. */
 162     static final int SAME_FRAME_SIZE = 64;
 163     static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;
 164     static final int SAME_FRAME_EXTENDED = 251;
 165     static final int FULL_FRAME = 255;
 166     static final int MAX_LOCAL_LENGTH_DIFF = 4;
 167 
 168     /** Get the ClassWriter instance for this context. */
 169     public static ClassWriter instance(Context context) {
 170         ClassWriter instance = context.get(classWriterKey);
 171         if (instance == null)
 172             instance = new ClassWriter(context);
 173         return instance;
 174     }
 175 
 176     /** Construct a class writer, given an options table.
 177      */
 178     protected ClassWriter(Context context) {
 179         context.put(classWriterKey, this);
 180 
 181         log = Log.instance(context);
 182         names = Names.instance(context);
 183         options = Options.instance(context);
 184         target = Target.instance(context);
 185         source = Source.instance(context);
 186         types = Types.instance(context);
 187         fileManager = context.get(JavaFileManager.class);
 188 
 189         verbose        = options.isSet(VERBOSE);
 190         scramble       = options.isSet("-scramble");
 191         scrambleAll    = options.isSet("-scrambleAll");
 192         retrofit       = options.isSet("-retrofit");
 193         genCrt         = options.isSet(XJCOV);
 194         debugstackmap  = options.isSet("debugstackmap");
 195 
 196         emitSourceFile = options.isUnset(G_CUSTOM) ||
 197                             options.isSet(G_CUSTOM, "source");
 198 
 199         String dumpModFlags = options.get("dumpmodifiers");
 200         dumpClassModifiers =
 201             (dumpModFlags != null && dumpModFlags.indexOf('c') != -1);
 202         dumpFieldModifiers =
 203             (dumpModFlags != null && dumpModFlags.indexOf('f') != -1);
 204         dumpInnerClassModifiers =
 205             (dumpModFlags != null && dumpModFlags.indexOf('i') != -1);
 206         dumpMethodModifiers =
 207             (dumpModFlags != null && dumpModFlags.indexOf('m') != -1);
 208     }
 209 
 210 /******************************************************************
 211  * Diagnostics: dump generated class names and modifiers
 212  ******************************************************************/
 213 
 214     /** Value of option 'dumpmodifiers' is a string
 215      *  indicating which modifiers should be dumped for debugging:
 216      *    'c' -- classes
 217      *    'f' -- fields
 218      *    'i' -- innerclass attributes
 219      *    'm' -- methods
 220      *  For example, to dump everything:
 221      *    javac -XDdumpmodifiers=cifm MyProg.java
 222      */
 223     private final boolean dumpClassModifiers; // -XDdumpmodifiers=c
 224     private final boolean dumpFieldModifiers; // -XDdumpmodifiers=f
 225     private final boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i
 226     private final boolean dumpMethodModifiers; // -XDdumpmodifiers=m
 227 
 228 
 229     /** Return flags as a string, separated by " ".
 230      */
 231     public static String flagNames(long flags) {
 232         StringBuilder sbuf = new StringBuilder();
 233         int i = 0;
 234         long f = flags & StandardFlags;
 235         while (f != 0) {
 236             if ((f & 1) != 0) {
 237                 sbuf.append(" ");
 238                 sbuf.append(flagName[i]);
 239             }
 240             f = f >> 1;
 241             i++;
 242         }
 243         return sbuf.toString();
 244     }
 245     //where
 246         private final static String[] flagName = {
 247             "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL",
 248             "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE",
 249             "ABSTRACT", "STRICTFP"};
 250 
 251 /******************************************************************
 252  * Output routines
 253  ******************************************************************/
 254 
 255     /** Write a character into given byte buffer;
 256      *  byte buffer will not be grown.
 257      */
 258     void putChar(ByteBuffer buf, int op, int x) {
 259         buf.elems[op  ] = (byte)((x >>  8) & 0xFF);
 260         buf.elems[op+1] = (byte)((x      ) & 0xFF);
 261     }
 262 
 263     /** Write an integer into given byte buffer;
 264      *  byte buffer will not be grown.
 265      */
 266     void putInt(ByteBuffer buf, int adr, int x) {
 267         buf.elems[adr  ] = (byte)((x >> 24) & 0xFF);
 268         buf.elems[adr+1] = (byte)((x >> 16) & 0xFF);
 269         buf.elems[adr+2] = (byte)((x >>  8) & 0xFF);
 270         buf.elems[adr+3] = (byte)((x      ) & 0xFF);
 271     }
 272 
 273 /******************************************************************
 274  * Signature Generation
 275  ******************************************************************/
 276 
 277     /** Assemble signature of given type in string buffer.
 278      */
 279     void assembleSig(Type type) {
 280         type = type.unannotatedType();
 281         switch (type.getTag()) {
 282         case BYTE:
 283             sigbuf.appendByte('B');
 284             break;
 285         case SHORT:
 286             sigbuf.appendByte('S');
 287             break;
 288         case CHAR:
 289             sigbuf.appendByte('C');
 290             break;
 291         case INT:
 292             sigbuf.appendByte('I');
 293             break;
 294         case LONG:
 295             sigbuf.appendByte('J');
 296             break;
 297         case FLOAT:
 298             sigbuf.appendByte('F');
 299             break;
 300         case DOUBLE:
 301             sigbuf.appendByte('D');
 302             break;
 303         case BOOLEAN:
 304             sigbuf.appendByte('Z');
 305             break;
 306         case VOID:
 307             sigbuf.appendByte('V');
 308             break;
 309         case CLASS:
 310             sigbuf.appendByte('L');
 311             assembleClassSig(type);
 312             sigbuf.appendByte(';');
 313             break;
 314         case ARRAY:
 315             ArrayType at = (ArrayType)type;
 316             sigbuf.appendByte('[');
 317             assembleSig(at.elemtype);
 318             break;
 319         case METHOD:
 320             MethodType mt = (MethodType)type;
 321             sigbuf.appendByte('(');
 322             assembleSig(mt.argtypes);
 323             sigbuf.appendByte(')');
 324             assembleSig(mt.restype);
 325             if (hasTypeVar(mt.thrown)) {
 326                 for (List<Type> l = mt.thrown; l.nonEmpty(); l = l.tail) {
 327                     sigbuf.appendByte('^');
 328                     assembleSig(l.head);
 329                 }
 330             }
 331             break;
 332         case WILDCARD: {
 333             WildcardType ta = (WildcardType) type;
 334             switch (ta.kind) {
 335             case SUPER:
 336                 sigbuf.appendByte('-');
 337                 assembleSig(ta.type);
 338                 break;
 339             case EXTENDS:
 340                 sigbuf.appendByte('+');
 341                 assembleSig(ta.type);
 342                 break;
 343             case UNBOUND:
 344                 sigbuf.appendByte('*');
 345                 break;
 346             default:
 347                 throw new AssertionError(ta.kind);
 348             }
 349             break;
 350         }
 351         case TYPEVAR:
 352             sigbuf.appendByte('T');
 353             sigbuf.appendName(type.tsym.name);
 354             sigbuf.appendByte(';');
 355             break;
 356         case FORALL:
 357             ForAll ft = (ForAll)type;
 358             assembleParamsSig(ft.tvars);
 359             assembleSig(ft.qtype);
 360             break;
 361         case UNINITIALIZED_THIS:
 362         case UNINITIALIZED_OBJECT:
 363             // we don't yet have a spec for uninitialized types in the
 364             // local variable table
 365             assembleSig(types.erasure(((UninitializedType)type).qtype));
 366             break;
 367         default:
 368             throw new AssertionError("typeSig " + type.getTag());
 369         }
 370     }
 371 
 372     boolean hasTypeVar(List<Type> l) {
 373         while (l.nonEmpty()) {
 374             if (l.head.hasTag(TYPEVAR)) return true;
 375             l = l.tail;
 376         }
 377         return false;
 378     }
 379 
 380     void assembleClassSig(Type type) {
 381         type = type.unannotatedType();
 382         ClassType ct = (ClassType)type;
 383         ClassSymbol c = (ClassSymbol)ct.tsym;
 384         enterInner(c);
 385         Type outer = ct.getEnclosingType();
 386         if (outer.allparams().nonEmpty()) {
 387             boolean rawOuter =
 388                 c.owner.kind == MTH || // either a local class
 389                 c.name == names.empty; // or anonymous
 390             assembleClassSig(rawOuter
 391                              ? types.erasure(outer)
 392                              : outer);
 393             sigbuf.appendByte('.');
 394             Assert.check(c.flatname.startsWith(c.owner.enclClass().flatname));
 395             sigbuf.appendName(rawOuter
 396                               ? c.flatname.subName(c.owner.enclClass().flatname.getByteLength()+1,c.flatname.getByteLength())
 397                               : c.name);
 398         } else {
 399             sigbuf.appendBytes(externalize(c.flatname));
 400         }
 401         if (ct.getTypeArguments().nonEmpty()) {
 402             sigbuf.appendByte('<');
 403             assembleSig(ct.getTypeArguments());
 404             sigbuf.appendByte('>');
 405         }
 406     }
 407 
 408 
 409     void assembleSig(List<Type> types) {
 410         for (List<Type> ts = types; ts.nonEmpty(); ts = ts.tail)
 411             assembleSig(ts.head);
 412     }
 413 
 414     void assembleParamsSig(List<Type> typarams) {
 415         sigbuf.appendByte('<');
 416         for (List<Type> ts = typarams; ts.nonEmpty(); ts = ts.tail) {
 417             TypeVar tvar = (TypeVar)ts.head;
 418             sigbuf.appendName(tvar.tsym.name);
 419             List<Type> bounds = types.getBounds(tvar);
 420             if ((bounds.head.tsym.flags() & INTERFACE) != 0) {
 421                 sigbuf.appendByte(':');
 422             }
 423             for (List<Type> l = bounds; l.nonEmpty(); l = l.tail) {
 424                 sigbuf.appendByte(':');
 425                 assembleSig(l.head);
 426             }
 427         }
 428         sigbuf.appendByte('>');
 429     }
 430 
 431     /** Return signature of given type
 432      */
 433     Name typeSig(Type type) {
 434         Assert.check(sigbuf.length == 0);
 435         //- System.out.println(" ? " + type);
 436         assembleSig(type);
 437         Name n = sigbuf.toName(names);
 438         sigbuf.reset();
 439         //- System.out.println("   " + n);
 440         return n;
 441     }
 442 
 443     /** Given a type t, return the extended class name of its erasure in
 444      *  external representation.
 445      */
 446     public Name xClassName(Type t) {
 447         if (t.hasTag(CLASS)) {
 448             return names.fromUtf(externalize(t.tsym.flatName()));
 449         } else if (t.hasTag(ARRAY)) {
 450             return typeSig(types.erasure(t));
 451         } else {
 452             throw new AssertionError("xClassName");
 453         }
 454     }
 455 
 456 /******************************************************************
 457  * Writing the Constant Pool
 458  ******************************************************************/
 459 
 460     /** Thrown when the constant pool is over full.
 461      */
 462     public static class PoolOverflow extends Exception {
 463         private static final long serialVersionUID = 0;
 464         public PoolOverflow() {}
 465     }
 466     public static class StringOverflow extends Exception {
 467         private static final long serialVersionUID = 0;
 468         public final String value;
 469         public StringOverflow(String s) {
 470             value = s;
 471         }
 472     }
 473 
 474     /** Write constant pool to pool buffer.
 475      *  Note: during writing, constant pool
 476      *  might grow since some parts of constants still need to be entered.
 477      */
 478     void writePool(Pool pool) throws PoolOverflow, StringOverflow {
 479         int poolCountIdx = poolbuf.length;
 480         poolbuf.appendChar(0);
 481         int i = 1;
 482         while (i < pool.pp) {
 483             Object value = pool.pool[i];
 484             Assert.checkNonNull(value);
 485             if (value instanceof Method || value instanceof Variable)
 486                 value = ((DelegatedSymbol)value).getUnderlyingSymbol();
 487 
 488             if (value instanceof MethodSymbol) {
 489                 MethodSymbol m = (MethodSymbol)value;
 490                 if (!m.isDynamic()) {
 491                     poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0
 492                               ? CONSTANT_InterfaceMethodref
 493                               : CONSTANT_Methodref);
 494                     poolbuf.appendChar(pool.put(m.owner));
 495                     poolbuf.appendChar(pool.put(nameType(m)));
 496                 } else {
 497                     //invokedynamic
 498                     DynamicMethodSymbol dynSym = (DynamicMethodSymbol)m;
 499                     MethodHandle handle = new MethodHandle(dynSym.bsmKind, dynSym.bsm, types);
 500                     DynamicMethod dynMeth = new DynamicMethod(dynSym, types);
 501                     bootstrapMethods.put(dynMeth, handle);
 502                     //init cp entries
 503                     pool.put(names.BootstrapMethods);
 504                     pool.put(handle);
 505                     for (Object staticArg : dynSym.staticArgs) {
 506                         pool.put(staticArg);
 507                     }
 508                     poolbuf.appendByte(CONSTANT_InvokeDynamic);
 509                     poolbuf.appendChar(bootstrapMethods.size() - 1);
 510                     poolbuf.appendChar(pool.put(nameType(dynSym)));
 511                 }
 512             } else if (value instanceof VarSymbol) {
 513                 VarSymbol v = (VarSymbol)value;
 514                 poolbuf.appendByte(CONSTANT_Fieldref);
 515                 poolbuf.appendChar(pool.put(v.owner));
 516                 poolbuf.appendChar(pool.put(nameType(v)));
 517             } else if (value instanceof Name) {
 518                 poolbuf.appendByte(CONSTANT_Utf8);
 519                 byte[] bs = ((Name)value).toUtf();
 520                 poolbuf.appendChar(bs.length);
 521                 poolbuf.appendBytes(bs, 0, bs.length);
 522                 if (bs.length > Pool.MAX_STRING_LENGTH)
 523                     throw new StringOverflow(value.toString());
 524             } else if (value instanceof ClassSymbol) {
 525                 ClassSymbol c = (ClassSymbol)value;
 526                 if (c.owner.kind == TYP) pool.put(c.owner);
 527                 poolbuf.appendByte(CONSTANT_Class);
 528                 if (c.type.hasTag(ARRAY)) {
 529                     poolbuf.appendChar(pool.put(typeSig(c.type)));
 530                 } else {
 531                     poolbuf.appendChar(pool.put(names.fromUtf(externalize(c.flatname))));
 532                     enterInner(c);
 533                 }
 534             } else if (value instanceof NameAndType) {
 535                 NameAndType nt = (NameAndType)value;
 536                 poolbuf.appendByte(CONSTANT_NameandType);
 537                 poolbuf.appendChar(pool.put(nt.name));
 538                 poolbuf.appendChar(pool.put(typeSig(nt.uniqueType.type)));
 539             } else if (value instanceof Integer) {
 540                 poolbuf.appendByte(CONSTANT_Integer);
 541                 poolbuf.appendInt(((Integer)value).intValue());
 542             } else if (value instanceof Long) {
 543                 poolbuf.appendByte(CONSTANT_Long);
 544                 poolbuf.appendLong(((Long)value).longValue());
 545                 i++;
 546             } else if (value instanceof Float) {
 547                 poolbuf.appendByte(CONSTANT_Float);
 548                 poolbuf.appendFloat(((Float)value).floatValue());
 549             } else if (value instanceof Double) {
 550                 poolbuf.appendByte(CONSTANT_Double);
 551                 poolbuf.appendDouble(((Double)value).doubleValue());
 552                 i++;
 553             } else if (value instanceof String) {
 554                 poolbuf.appendByte(CONSTANT_String);
 555                 poolbuf.appendChar(pool.put(names.fromString((String)value)));
 556             } else if (value instanceof UniqueType) {
 557                 Type type = ((UniqueType)value).type;
 558                 if (type instanceof MethodType) {
 559                     poolbuf.appendByte(CONSTANT_MethodType);
 560                     poolbuf.appendChar(pool.put(typeSig((MethodType)type)));
 561                 } else {
 562                     if (type.hasTag(CLASS)) enterInner((ClassSymbol)type.tsym);
 563                     poolbuf.appendByte(CONSTANT_Class);
 564                     poolbuf.appendChar(pool.put(xClassName(type)));
 565                 }
 566             } else if (value instanceof MethodHandle) {
 567                 MethodHandle ref = (MethodHandle)value;
 568                 poolbuf.appendByte(CONSTANT_MethodHandle);
 569                 poolbuf.appendByte(ref.refKind);
 570                 poolbuf.appendChar(pool.put(ref.refSym));
 571             } else {
 572                 Assert.error("writePool " + value);
 573             }
 574             i++;
 575         }
 576         if (pool.pp > Pool.MAX_ENTRIES)
 577             throw new PoolOverflow();
 578         putChar(poolbuf, poolCountIdx, pool.pp);
 579     }
 580 
 581     /** Given a field, return its name.
 582      */
 583     Name fieldName(Symbol sym) {
 584         if (scramble && (sym.flags() & PRIVATE) != 0 ||
 585             scrambleAll && (sym.flags() & (PROTECTED | PUBLIC)) == 0)
 586             return names.fromString("_$" + sym.name.getIndex());
 587         else
 588             return sym.name;
 589     }
 590 
 591     /** Given a symbol, return its name-and-type.
 592      */
 593     NameAndType nameType(Symbol sym) {
 594         return new NameAndType(fieldName(sym),
 595                                retrofit
 596                                ? sym.erasure(types)
 597                                : sym.externalType(types), types);
 598         // if we retrofit, then the NameAndType has been read in as is
 599         // and no change is necessary. If we compile normally, the
 600         // NameAndType is generated from a symbol reference, and the
 601         // adjustment of adding an additional this$n parameter needs to be made.
 602     }
 603 
 604 /******************************************************************
 605  * Writing Attributes
 606  ******************************************************************/
 607 
 608     /** Write header for an attribute to data buffer and return
 609      *  position past attribute length index.
 610      */
 611     int writeAttr(Name attrName) {
 612         databuf.appendChar(pool.put(attrName));
 613         databuf.appendInt(0);
 614         return databuf.length;
 615     }
 616 
 617     /** Fill in attribute length.
 618      */
 619     void endAttr(int index) {
 620         putInt(databuf, index - 4, databuf.length - index);
 621     }
 622 
 623     /** Leave space for attribute count and return index for
 624      *  number of attributes field.
 625      */
 626     int beginAttrs() {
 627         databuf.appendChar(0);
 628         return databuf.length;
 629     }
 630 
 631     /** Fill in number of attributes.
 632      */
 633     void endAttrs(int index, int count) {
 634         putChar(databuf, index - 2, count);
 635     }
 636 
 637     /** Write the EnclosingMethod attribute if needed.
 638      *  Returns the number of attributes written (0 or 1).
 639      */
 640     int writeEnclosingMethodAttribute(ClassSymbol c) {
 641         if (!target.hasEnclosingMethodAttribute())
 642             return 0;
 643         return writeEnclosingMethodAttribute(names.EnclosingMethod, c);
 644     }
 645 
 646     /** Write the EnclosingMethod attribute with a specified name.
 647      *  Returns the number of attributes written (0 or 1).
 648      */
 649     protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) {
 650         if (c.owner.kind != MTH && // neither a local class
 651             c.name != names.empty) // nor anonymous
 652             return 0;
 653 
 654         int alenIdx = writeAttr(attributeName);
 655         ClassSymbol enclClass = c.owner.enclClass();
 656         MethodSymbol enclMethod =
 657             (c.owner.type == null // local to init block
 658              || c.owner.kind != MTH) // or member init
 659             ? null
 660             : (MethodSymbol)c.owner;
 661         databuf.appendChar(pool.put(enclClass));
 662         databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner)));
 663         endAttr(alenIdx);
 664         return 1;
 665     }
 666 
 667     /** Write flag attributes; return number of attributes written.
 668      */
 669     int writeFlagAttrs(long flags) {
 670         int acount = 0;
 671         if ((flags & DEPRECATED) != 0) {
 672             int alenIdx = writeAttr(names.Deprecated);
 673             endAttr(alenIdx);
 674             acount++;
 675         }
 676         if ((flags & ENUM) != 0 && !target.useEnumFlag()) {
 677             int alenIdx = writeAttr(names.Enum);
 678             endAttr(alenIdx);
 679             acount++;
 680         }
 681         if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag()) {
 682             int alenIdx = writeAttr(names.Synthetic);
 683             endAttr(alenIdx);
 684             acount++;
 685         }
 686         if ((flags & BRIDGE) != 0 && !target.useBridgeFlag()) {
 687             int alenIdx = writeAttr(names.Bridge);
 688             endAttr(alenIdx);
 689             acount++;
 690         }
 691         if ((flags & VARARGS) != 0 && !target.useVarargsFlag()) {
 692             int alenIdx = writeAttr(names.Varargs);
 693             endAttr(alenIdx);
 694             acount++;
 695         }
 696         if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag()) {
 697             int alenIdx = writeAttr(names.Annotation);
 698             endAttr(alenIdx);
 699             acount++;
 700         }
 701         return acount;
 702     }
 703 
 704     /** Write member (field or method) attributes;
 705      *  return number of attributes written.
 706      */
 707     int writeMemberAttrs(Symbol sym) {
 708         int acount = writeFlagAttrs(sym.flags());
 709         long flags = sym.flags();
 710         if (source.allowGenerics() &&
 711             (flags & (SYNTHETIC|BRIDGE)) != SYNTHETIC &&
 712             (flags & ANONCONSTR) == 0 &&
 713             (!types.isSameType(sym.type, sym.erasure(types)) ||
 714              hasTypeVar(sym.type.getThrownTypes()))) {
 715             // note that a local class with captured variables
 716             // will get a signature attribute
 717             int alenIdx = writeAttr(names.Signature);
 718             databuf.appendChar(pool.put(typeSig(sym.type)));
 719             endAttr(alenIdx);
 720             acount++;
 721         }
 722         acount += writeJavaAnnotations(sym.getRawAttributes());
 723         acount += writeTypeAnnotations(sym.getRawTypeAttributes());
 724         return acount;
 725     }
 726 
 727     /**
 728      * Write method parameter names attribute.
 729      */
 730     int writeMethodParametersAttr(MethodSymbol m) {
 731         if (m.params != null && 0 != m.params.length()) {
 732             int attrIndex = writeAttr(names.MethodParameters);
 733             databuf.appendByte(m.params.length());
 734             for (VarSymbol s : m.params) {
 735                 // TODO: expand to cover synthesized, once we figure out
 736                 // how to represent that.
 737                 final int flags = (int) s.flags() & (FINAL | SYNTHETIC);
 738                 // output parameter info
 739                 databuf.appendChar(pool.put(s.name));
 740                 databuf.appendInt(flags);
 741             }
 742             endAttr(attrIndex);
 743             return 1;
 744         } else
 745             return 0;
 746     }
 747 
 748 
 749     /** Write method parameter annotations;
 750      *  return number of attributes written.
 751      */
 752     int writeParameterAttrs(MethodSymbol m) {
 753         boolean hasVisible = false;
 754         boolean hasInvisible = false;
 755         if (m.params != null) for (VarSymbol s : m.params) {
 756             for (Attribute.Compound a : s.getRawAttributes()) {
 757                 switch (types.getRetention(a)) {
 758                 case SOURCE: break;
 759                 case CLASS: hasInvisible = true; break;
 760                 case RUNTIME: hasVisible = true; break;
 761                 default: ;// /* fail soft */ throw new AssertionError(vis);
 762                 }
 763             }
 764         }
 765 
 766         int attrCount = 0;
 767         if (hasVisible) {
 768             int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
 769             databuf.appendByte(m.params.length());
 770             for (VarSymbol s : m.params) {
 771                 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
 772                 for (Attribute.Compound a : s.getRawAttributes())
 773                     if (types.getRetention(a) == RetentionPolicy.RUNTIME)
 774                         buf.append(a);
 775                 databuf.appendChar(buf.length());
 776                 for (Attribute.Compound a : buf)
 777                     writeCompoundAttribute(a);
 778             }
 779             endAttr(attrIndex);
 780             attrCount++;
 781         }
 782         if (hasInvisible) {
 783             int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
 784             databuf.appendByte(m.params.length());
 785             for (VarSymbol s : m.params) {
 786                 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
 787                 for (Attribute.Compound a : s.getRawAttributes())
 788                     if (types.getRetention(a) == RetentionPolicy.CLASS)
 789                         buf.append(a);
 790                 databuf.appendChar(buf.length());
 791                 for (Attribute.Compound a : buf)
 792                     writeCompoundAttribute(a);
 793             }
 794             endAttr(attrIndex);
 795             attrCount++;
 796         }
 797         return attrCount;
 798     }
 799 
 800 /**********************************************************************
 801  * Writing Java-language annotations (aka metadata, attributes)
 802  **********************************************************************/
 803 
 804     /** Write Java-language annotations; return number of JVM
 805      *  attributes written (zero or one).
 806      */
 807     int writeJavaAnnotations(List<Attribute.Compound> attrs) {
 808         if (attrs.isEmpty()) return 0;
 809         ListBuffer<Attribute.Compound> visibles = new ListBuffer<Attribute.Compound>();
 810         ListBuffer<Attribute.Compound> invisibles = new ListBuffer<Attribute.Compound>();
 811         for (Attribute.Compound a : attrs) {
 812             switch (types.getRetention(a)) {
 813             case SOURCE: break;
 814             case CLASS: invisibles.append(a); break;
 815             case RUNTIME: visibles.append(a); break;
 816             default: ;// /* fail soft */ throw new AssertionError(vis);
 817             }
 818         }
 819 
 820         int attrCount = 0;
 821         if (visibles.length() != 0) {
 822             int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
 823             databuf.appendChar(visibles.length());
 824             for (Attribute.Compound a : visibles)
 825                 writeCompoundAttribute(a);
 826             endAttr(attrIndex);
 827             attrCount++;
 828         }
 829         if (invisibles.length() != 0) {
 830             int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
 831             databuf.appendChar(invisibles.length());
 832             for (Attribute.Compound a : invisibles)
 833                 writeCompoundAttribute(a);
 834             endAttr(attrIndex);
 835             attrCount++;
 836         }
 837         return attrCount;
 838     }
 839 
 840     int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos) {
 841         if (typeAnnos.isEmpty()) return 0;
 842 
 843         ListBuffer<Attribute.TypeCompound> visibles = ListBuffer.lb();
 844         ListBuffer<Attribute.TypeCompound> invisibles = ListBuffer.lb();
 845 
 846         for (Attribute.TypeCompound tc : typeAnnos) {
 847             if (tc.position == null || tc.position.type == TargetType.UNKNOWN) {
 848                 boolean found = false;
 849                 // TODO: the position for the container annotation of a
 850                 // repeating type annotation has to be set.
 851                 // This cannot be done when the container is created, because
 852                 // then the position is not determined yet.
 853                 // How can we link these pieces better together?
 854                 if (tc.values.size() == 1) {
 855                     Pair<MethodSymbol, Attribute> val = tc.values.get(0);
 856                     if (val.fst.getSimpleName().contentEquals("value") &&
 857                             val.snd instanceof Attribute.Array) {
 858                         Attribute.Array arr = (Attribute.Array) val.snd;
 859                         if (arr.values.length != 0 &&
 860                                 arr.values[0] instanceof Attribute.TypeCompound) {
 861                             TypeCompound atycomp = (Attribute.TypeCompound) arr.values[0];
 862                             if (atycomp.position.type != TargetType.UNKNOWN) {
 863                                 tc.position = atycomp.position;
 864                                 found = true;
 865                             }
 866                         }
 867                     }
 868                 }
 869                 if (!found) {
 870                     // This happens for nested types like @A Outer. @B Inner.
 871                     // For method parameters we get the annotation twice! Once with
 872                     // a valid position, once unknown.
 873                     // TODO: find a cleaner solution.
 874                     // System.err.println("ClassWriter: Position UNKNOWN in type annotation: " + tc);
 875                     continue;
 876                 }
 877             }
 878             if (!tc.position.emitToClassfile())
 879                 continue;
 880             switch (types.getRetention(tc)) {
 881             case SOURCE: break;
 882             case CLASS: invisibles.append(tc); break;
 883             case RUNTIME: visibles.append(tc); break;
 884             default: ;// /* fail soft */ throw new AssertionError(vis);
 885             }
 886         }
 887 
 888         int attrCount = 0;
 889         if (visibles.length() != 0) {
 890             int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations);
 891             databuf.appendChar(visibles.length());
 892             for (Attribute.TypeCompound p : visibles)
 893                 writeTypeAnnotation(p);
 894             endAttr(attrIndex);
 895             attrCount++;
 896         }
 897 
 898         if (invisibles.length() != 0) {
 899             int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations);
 900             databuf.appendChar(invisibles.length());
 901             for (Attribute.TypeCompound p : invisibles)
 902                 writeTypeAnnotation(p);
 903             endAttr(attrIndex);
 904             attrCount++;
 905         }
 906 
 907         return attrCount;
 908     }
 909 
 910     /** A visitor to write an attribute including its leading
 911      *  single-character marker.
 912      */
 913     class AttributeWriter implements Attribute.Visitor {
 914         public void visitConstant(Attribute.Constant _value) {
 915             Object value = _value.value;
 916             switch (_value.type.getTag()) {
 917             case BYTE:
 918                 databuf.appendByte('B');
 919                 break;
 920             case CHAR:
 921                 databuf.appendByte('C');
 922                 break;
 923             case SHORT:
 924                 databuf.appendByte('S');
 925                 break;
 926             case INT:
 927                 databuf.appendByte('I');
 928                 break;
 929             case LONG:
 930                 databuf.appendByte('J');
 931                 break;
 932             case FLOAT:
 933                 databuf.appendByte('F');
 934                 break;
 935             case DOUBLE:
 936                 databuf.appendByte('D');
 937                 break;
 938             case BOOLEAN:
 939                 databuf.appendByte('Z');
 940                 break;
 941             case CLASS:
 942                 Assert.check(value instanceof String);
 943                 databuf.appendByte('s');
 944                 value = names.fromString(value.toString()); // CONSTANT_Utf8
 945                 break;
 946             default:
 947                 throw new AssertionError(_value.type);
 948             }
 949             databuf.appendChar(pool.put(value));
 950         }
 951         public void visitEnum(Attribute.Enum e) {
 952             databuf.appendByte('e');
 953             databuf.appendChar(pool.put(typeSig(e.value.type)));
 954             databuf.appendChar(pool.put(e.value.name));
 955         }
 956         public void visitClass(Attribute.Class clazz) {
 957             databuf.appendByte('c');
 958             databuf.appendChar(pool.put(typeSig(clazz.classType)));
 959         }
 960         public void visitCompound(Attribute.Compound compound) {
 961             databuf.appendByte('@');
 962             writeCompoundAttribute(compound);
 963         }
 964         public void visitError(Attribute.Error x) {
 965             throw new AssertionError(x);
 966         }
 967         public void visitArray(Attribute.Array array) {
 968             databuf.appendByte('[');
 969             databuf.appendChar(array.values.length);
 970             for (Attribute a : array.values) {
 971                 a.accept(this);
 972             }
 973         }
 974     }
 975     AttributeWriter awriter = new AttributeWriter();
 976 
 977     /** Write a compound attribute excluding the '@' marker. */
 978     void writeCompoundAttribute(Attribute.Compound c) {
 979         databuf.appendChar(pool.put(typeSig(c.type)));
 980         databuf.appendChar(c.values.length());
 981         for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
 982             databuf.appendChar(pool.put(p.fst.name));
 983             p.snd.accept(awriter);
 984         }
 985     }
 986 
 987     void writeTypeAnnotation(Attribute.TypeCompound c) {
 988         writePosition(c.position);
 989         writeCompoundAttribute(c);
 990     }
 991 
 992     void writePosition(TypeAnnotationPosition p) {
 993         databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte
 994         switch (p.type) {
 995         // instanceof
 996         case INSTANCEOF:
 997         // new expression
 998         case NEW:
 999         // constructor/method reference receiver
1000         case CONSTRUCTOR_REFERENCE:
1001         case METHOD_REFERENCE:
1002             databuf.appendChar(p.offset);
1003             break;
1004         // local variable
1005         case LOCAL_VARIABLE:
1006         // resource variable
1007         case RESOURCE_VARIABLE:
1008             databuf.appendChar(p.lvarOffset.length);  // for table length
1009             for (int i = 0; i < p.lvarOffset.length; ++i) {
1010                 databuf.appendChar(p.lvarOffset[i]);
1011                 databuf.appendChar(p.lvarLength[i]);
1012                 databuf.appendChar(p.lvarIndex[i]);
1013             }
1014             break;
1015         // exception parameter
1016         case EXCEPTION_PARAMETER:
1017             databuf.appendByte(p.exception_index);
1018             break;
1019         // method receiver
1020         case METHOD_RECEIVER:
1021             // Do nothing
1022             break;
1023         // type parameter
1024         case CLASS_TYPE_PARAMETER:
1025         case METHOD_TYPE_PARAMETER:
1026             databuf.appendByte(p.parameter_index);
1027             break;
1028         // type parameter bound
1029         case CLASS_TYPE_PARAMETER_BOUND:
1030         case METHOD_TYPE_PARAMETER_BOUND:
1031             databuf.appendByte(p.parameter_index);
1032             databuf.appendByte(p.bound_index);
1033             break;
1034         // class extends or implements clause
1035         case CLASS_EXTENDS:
1036             databuf.appendChar(p.type_index);
1037             break;
1038         // throws
1039         case THROWS:
1040             databuf.appendChar(p.type_index);
1041             break;
1042         // method parameter
1043         case METHOD_FORMAL_PARAMETER:
1044             databuf.appendByte(p.parameter_index);
1045             break;
1046         // type cast
1047         case CAST:
1048         // method/constructor/reference type argument
1049         case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
1050         case METHOD_INVOCATION_TYPE_ARGUMENT:
1051         case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT:
1052         case METHOD_REFERENCE_TYPE_ARGUMENT:
1053             databuf.appendChar(p.offset);
1054             databuf.appendByte(p.type_index);
1055             break;
1056         // We don't need to worry about these
1057         case METHOD_RETURN:
1058         case FIELD:
1059             break;
1060         case UNKNOWN:
1061             throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!");
1062         default:
1063             throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p);
1064         }
1065 
1066         { // Append location data for generics/arrays.
1067             databuf.appendByte(p.location.size());
1068             java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location);
1069             for (int i : loc)
1070                 databuf.appendByte((byte)i);
1071         }
1072     }
1073 
1074 /**********************************************************************
1075  * Writing Objects
1076  **********************************************************************/
1077 
1078     /** Enter an inner class into the `innerClasses' set/queue.
1079      */
1080     void enterInner(ClassSymbol c) {
1081         if (c.type.isCompound()) {
1082             throw new AssertionError("Unexpected intersection type: " + c.type);
1083         }
1084         try {
1085             c.complete();
1086         } catch (CompletionFailure ex) {
1087             System.err.println("error: " + c + ": " + ex.getMessage());
1088             throw ex;
1089         }
1090         if (!c.type.hasTag(CLASS)) return; // arrays
1091         if (pool != null && // pool might be null if called from xClassName
1092             c.owner.enclClass() != null &&
1093             (innerClasses == null || !innerClasses.contains(c))) {
1094 //          log.errWriter.println("enter inner " + c);//DEBUG
1095             enterInner(c.owner.enclClass());
1096             pool.put(c);
1097             pool.put(c.name);
1098             if (innerClasses == null) {
1099                 innerClasses = new HashSet<ClassSymbol>();
1100                 innerClassesQueue = new ListBuffer<ClassSymbol>();
1101                 pool.put(names.InnerClasses);
1102             }
1103             innerClasses.add(c);
1104             innerClassesQueue.append(c);
1105         }
1106     }
1107 
1108     /** Write "inner classes" attribute.
1109      */
1110     void writeInnerClasses() {
1111         int alenIdx = writeAttr(names.InnerClasses);
1112         databuf.appendChar(innerClassesQueue.length());
1113         for (List<ClassSymbol> l = innerClassesQueue.toList();
1114              l.nonEmpty();
1115              l = l.tail) {
1116             ClassSymbol inner = l.head;
1117             char flags = (char) adjustFlags(inner.flags_field);
1118             if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
1119             if (inner.name.isEmpty()) flags &= ~FINAL; // Anonymous class: unset FINAL flag
1120             if (dumpInnerClassModifiers) {
1121                 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1122                 pw.println("INNERCLASS  " + inner.name);
1123                 pw.println("---" + flagNames(flags));
1124             }
1125             databuf.appendChar(pool.get(inner));
1126             databuf.appendChar(
1127                 inner.owner.kind == TYP ? pool.get(inner.owner) : 0);
1128             databuf.appendChar(
1129                 !inner.name.isEmpty() ? pool.get(inner.name) : 0);
1130             databuf.appendChar(flags);
1131         }
1132         endAttr(alenIdx);
1133     }
1134 
1135     /** Write "bootstrapMethods" attribute.
1136      */
1137     void writeBootstrapMethods() {
1138         int alenIdx = writeAttr(names.BootstrapMethods);
1139         databuf.appendChar(bootstrapMethods.size());
1140         for (Map.Entry<DynamicMethod, MethodHandle> entry : bootstrapMethods.entrySet()) {
1141             DynamicMethod dmeth = entry.getKey();
1142             DynamicMethodSymbol dsym = (DynamicMethodSymbol)dmeth.baseSymbol();
1143             //write BSM handle
1144             databuf.appendChar(pool.get(entry.getValue()));
1145             //write static args length
1146             databuf.appendChar(dsym.staticArgs.length);
1147             //write static args array
1148             Object[] uniqueArgs = dmeth.uniqueStaticArgs;
1149             for (Object o : uniqueArgs) {
1150                 databuf.appendChar(pool.get(o));
1151             }
1152         }
1153         endAttr(alenIdx);
1154     }
1155 
1156     /** Write field symbol, entering all references into constant pool.
1157      */
1158     void writeField(VarSymbol v) {
1159         int flags = adjustFlags(v.flags());
1160         databuf.appendChar(flags);
1161         if (dumpFieldModifiers) {
1162             PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1163             pw.println("FIELD  " + fieldName(v));
1164             pw.println("---" + flagNames(v.flags()));
1165         }
1166         databuf.appendChar(pool.put(fieldName(v)));
1167         databuf.appendChar(pool.put(typeSig(v.erasure(types))));
1168         int acountIdx = beginAttrs();
1169         int acount = 0;
1170         if (v.getConstValue() != null) {
1171             int alenIdx = writeAttr(names.ConstantValue);
1172             databuf.appendChar(pool.put(v.getConstValue()));
1173             endAttr(alenIdx);
1174             acount++;
1175         }
1176         acount += writeMemberAttrs(v);
1177         endAttrs(acountIdx, acount);
1178     }
1179 
1180     /** Write method symbol, entering all references into constant pool.
1181      */
1182     void writeMethod(MethodSymbol m) {
1183         int flags = adjustFlags(m.flags());
1184         databuf.appendChar(flags);
1185         if (dumpMethodModifiers) {
1186             PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1187             pw.println("METHOD  " + fieldName(m));
1188             pw.println("---" + flagNames(m.flags()));
1189         }
1190         databuf.appendChar(pool.put(fieldName(m)));
1191         databuf.appendChar(pool.put(typeSig(m.externalType(types))));
1192         int acountIdx = beginAttrs();
1193         int acount = 0;
1194         if (m.code != null) {
1195             int alenIdx = writeAttr(names.Code);
1196             writeCode(m.code);
1197             m.code = null; // to conserve space
1198             endAttr(alenIdx);
1199             acount++;
1200         }
1201         List<Type> thrown = m.erasure(types).getThrownTypes();
1202         if (thrown.nonEmpty()) {
1203             int alenIdx = writeAttr(names.Exceptions);
1204             databuf.appendChar(thrown.length());
1205             for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1206                 databuf.appendChar(pool.put(l.head.tsym));
1207             endAttr(alenIdx);
1208             acount++;
1209         }
1210         if (m.defaultValue != null) {
1211             int alenIdx = writeAttr(names.AnnotationDefault);
1212             m.defaultValue.accept(awriter);
1213             endAttr(alenIdx);
1214             acount++;
1215         }
1216         if (options.isSet(PARAMETERS))
1217             acount += writeMethodParametersAttr(m);
1218         acount += writeMemberAttrs(m);
1219         acount += writeParameterAttrs(m);
1220         endAttrs(acountIdx, acount);
1221     }
1222 
1223     /** Write code attribute of method.
1224      */
1225     void writeCode(Code code) {
1226         databuf.appendChar(code.max_stack);
1227         databuf.appendChar(code.max_locals);
1228         databuf.appendInt(code.cp);
1229         databuf.appendBytes(code.code, 0, code.cp);
1230         databuf.appendChar(code.catchInfo.length());
1231         for (List<char[]> l = code.catchInfo.toList();
1232              l.nonEmpty();
1233              l = l.tail) {
1234             for (int i = 0; i < l.head.length; i++)
1235                 databuf.appendChar(l.head[i]);
1236         }
1237         int acountIdx = beginAttrs();
1238         int acount = 0;
1239 
1240         if (code.lineInfo.nonEmpty()) {
1241             int alenIdx = writeAttr(names.LineNumberTable);
1242             databuf.appendChar(code.lineInfo.length());
1243             for (List<char[]> l = code.lineInfo.reverse();
1244                  l.nonEmpty();
1245                  l = l.tail)
1246                 for (int i = 0; i < l.head.length; i++)
1247                     databuf.appendChar(l.head[i]);
1248             endAttr(alenIdx);
1249             acount++;
1250         }
1251 
1252         if (genCrt && (code.crt != null)) {
1253             CRTable crt = code.crt;
1254             int alenIdx = writeAttr(names.CharacterRangeTable);
1255             int crtIdx = beginAttrs();
1256             int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1257             endAttrs(crtIdx, crtEntries);
1258             endAttr(alenIdx);
1259             acount++;
1260         }
1261 
1262         // counter for number of generic local variables
1263         int nGenericVars = 0;
1264 
1265         if (code.varBufferSize > 0) {
1266             int alenIdx = writeAttr(names.LocalVariableTable);
1267             databuf.appendChar(code.varBufferSize);
1268 
1269             for (int i=0; i<code.varBufferSize; i++) {
1270                 Code.LocalVar var = code.varBuffer[i];
1271 
1272                 // write variable info
1273                 Assert.check(var.start_pc >= 0
1274                         && var.start_pc <= code.cp);
1275                 databuf.appendChar(var.start_pc);
1276                 Assert.check(var.length >= 0
1277                         && (var.start_pc + var.length) <= code.cp);
1278                 databuf.appendChar(var.length);
1279                 VarSymbol sym = var.sym;
1280                 databuf.appendChar(pool.put(sym.name));
1281                 Type vartype = sym.erasure(types);
1282                 if (needsLocalVariableTypeEntry(sym.type))
1283                     nGenericVars++;
1284                 databuf.appendChar(pool.put(typeSig(vartype)));
1285                 databuf.appendChar(var.reg);
1286             }
1287             endAttr(alenIdx);
1288             acount++;
1289         }
1290 
1291         if (nGenericVars > 0) {
1292             int alenIdx = writeAttr(names.LocalVariableTypeTable);
1293             databuf.appendChar(nGenericVars);
1294             int count = 0;
1295 
1296             for (int i=0; i<code.varBufferSize; i++) {
1297                 Code.LocalVar var = code.varBuffer[i];
1298                 VarSymbol sym = var.sym;
1299                 if (!needsLocalVariableTypeEntry(sym.type))
1300                     continue;
1301                 count++;
1302                 // write variable info
1303                 databuf.appendChar(var.start_pc);
1304                 databuf.appendChar(var.length);
1305                 databuf.appendChar(pool.put(sym.name));
1306                 databuf.appendChar(pool.put(typeSig(sym.type)));
1307                 databuf.appendChar(var.reg);
1308             }
1309             Assert.check(count == nGenericVars);
1310             endAttr(alenIdx);
1311             acount++;
1312         }
1313 
1314         if (code.stackMapBufferSize > 0) {
1315             if (debugstackmap) System.out.println("Stack map for " + code.meth);
1316             int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1317             writeStackMap(code);
1318             endAttr(alenIdx);
1319             acount++;
1320         }
1321         endAttrs(acountIdx, acount);
1322     }
1323     //where
1324     private boolean needsLocalVariableTypeEntry(Type t) {
1325         //a local variable needs a type-entry if its type T is generic
1326         //(i.e. |T| != T) and if it's not an intersection type (not supported
1327         //in signature attribute grammar)
1328         return (!types.isSameType(t, types.erasure(t)) &&
1329                 !t.isCompound());
1330     }
1331 
1332     void writeStackMap(Code code) {
1333         int nframes = code.stackMapBufferSize;
1334         if (debugstackmap) System.out.println(" nframes = " + nframes);
1335         databuf.appendChar(nframes);
1336 
1337         switch (code.stackMap) {
1338         case CLDC:
1339             for (int i=0; i<nframes; i++) {
1340                 if (debugstackmap) System.out.print("  " + i + ":");
1341                 Code.StackMapFrame frame = code.stackMapBuffer[i];
1342 
1343                 // output PC
1344                 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1345                 databuf.appendChar(frame.pc);
1346 
1347                 // output locals
1348                 int localCount = 0;
1349                 for (int j=0; j<frame.locals.length;
1350                      j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1351                     localCount++;
1352                 }
1353                 if (debugstackmap) System.out.print(" nlocals=" +
1354                                                     localCount);
1355                 databuf.appendChar(localCount);
1356                 for (int j=0; j<frame.locals.length;
1357                      j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1358                     if (debugstackmap) System.out.print(" local[" + j + "]=");
1359                     writeStackMapType(frame.locals[j]);
1360                 }
1361 
1362                 // output stack
1363                 int stackCount = 0;
1364                 for (int j=0; j<frame.stack.length;
1365                      j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1366                     stackCount++;
1367                 }
1368                 if (debugstackmap) System.out.print(" nstack=" +
1369                                                     stackCount);
1370                 databuf.appendChar(stackCount);
1371                 for (int j=0; j<frame.stack.length;
1372                      j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1373                     if (debugstackmap) System.out.print(" stack[" + j + "]=");
1374                     writeStackMapType(frame.stack[j]);
1375                 }
1376                 if (debugstackmap) System.out.println();
1377             }
1378             break;
1379         case JSR202: {
1380             Assert.checkNull(code.stackMapBuffer);
1381             for (int i=0; i<nframes; i++) {
1382                 if (debugstackmap) System.out.print("  " + i + ":");
1383                 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1384                 frame.write(this);
1385                 if (debugstackmap) System.out.println();
1386             }
1387             break;
1388         }
1389         default:
1390             throw new AssertionError("Unexpected stackmap format value");
1391         }
1392     }
1393 
1394         //where
1395         void writeStackMapType(Type t) {
1396             if (t == null) {
1397                 if (debugstackmap) System.out.print("empty");
1398                 databuf.appendByte(0);
1399             }
1400             else switch(t.getTag()) {
1401             case BYTE:
1402             case CHAR:
1403             case SHORT:
1404             case INT:
1405             case BOOLEAN:
1406                 if (debugstackmap) System.out.print("int");
1407                 databuf.appendByte(1);
1408                 break;
1409             case FLOAT:
1410                 if (debugstackmap) System.out.print("float");
1411                 databuf.appendByte(2);
1412                 break;
1413             case DOUBLE:
1414                 if (debugstackmap) System.out.print("double");
1415                 databuf.appendByte(3);
1416                 break;
1417             case LONG:
1418                 if (debugstackmap) System.out.print("long");
1419                 databuf.appendByte(4);
1420                 break;
1421             case BOT: // null
1422                 if (debugstackmap) System.out.print("null");
1423                 databuf.appendByte(5);
1424                 break;
1425             case CLASS:
1426             case ARRAY:
1427                 if (debugstackmap) System.out.print("object(" + t + ")");
1428                 databuf.appendByte(7);
1429                 databuf.appendChar(pool.put(t));
1430                 break;
1431             case TYPEVAR:
1432                 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1433                 databuf.appendByte(7);
1434                 databuf.appendChar(pool.put(types.erasure(t).tsym));
1435                 break;
1436             case UNINITIALIZED_THIS:
1437                 if (debugstackmap) System.out.print("uninit_this");
1438                 databuf.appendByte(6);
1439                 break;
1440             case UNINITIALIZED_OBJECT:
1441                 { UninitializedType uninitType = (UninitializedType)t;
1442                 databuf.appendByte(8);
1443                 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1444                 databuf.appendChar(uninitType.offset);
1445                 }
1446                 break;
1447             default:
1448                 throw new AssertionError();
1449             }
1450         }
1451 
1452     /** An entry in the JSR202 StackMapTable */
1453     abstract static class StackMapTableFrame {
1454         abstract int getFrameType();
1455 
1456         void write(ClassWriter writer) {
1457             int frameType = getFrameType();
1458             writer.databuf.appendByte(frameType);
1459             if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1460         }
1461 
1462         static class SameFrame extends StackMapTableFrame {
1463             final int offsetDelta;
1464             SameFrame(int offsetDelta) {
1465                 this.offsetDelta = offsetDelta;
1466             }
1467             int getFrameType() {
1468                 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1469             }
1470             @Override
1471             void write(ClassWriter writer) {
1472                 super.write(writer);
1473                 if (getFrameType() == SAME_FRAME_EXTENDED) {
1474                     writer.databuf.appendChar(offsetDelta);
1475                     if (writer.debugstackmap){
1476                         System.out.print(" offset_delta=" + offsetDelta);
1477                     }
1478                 }
1479             }
1480         }
1481 
1482         static class SameLocals1StackItemFrame extends StackMapTableFrame {
1483             final int offsetDelta;
1484             final Type stack;
1485             SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1486                 this.offsetDelta = offsetDelta;
1487                 this.stack = stack;
1488             }
1489             int getFrameType() {
1490                 return (offsetDelta < SAME_FRAME_SIZE) ?
1491                        (SAME_FRAME_SIZE + offsetDelta) :
1492                        SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1493             }
1494             @Override
1495             void write(ClassWriter writer) {
1496                 super.write(writer);
1497                 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1498                     writer.databuf.appendChar(offsetDelta);
1499                     if (writer.debugstackmap) {
1500                         System.out.print(" offset_delta=" + offsetDelta);
1501                     }
1502                 }
1503                 if (writer.debugstackmap) {
1504                     System.out.print(" stack[" + 0 + "]=");
1505                 }
1506                 writer.writeStackMapType(stack);
1507             }
1508         }
1509 
1510         static class ChopFrame extends StackMapTableFrame {
1511             final int frameType;
1512             final int offsetDelta;
1513             ChopFrame(int frameType, int offsetDelta) {
1514                 this.frameType = frameType;
1515                 this.offsetDelta = offsetDelta;
1516             }
1517             int getFrameType() { return frameType; }
1518             @Override
1519             void write(ClassWriter writer) {
1520                 super.write(writer);
1521                 writer.databuf.appendChar(offsetDelta);
1522                 if (writer.debugstackmap) {
1523                     System.out.print(" offset_delta=" + offsetDelta);
1524                 }
1525             }
1526         }
1527 
1528         static class AppendFrame extends StackMapTableFrame {
1529             final int frameType;
1530             final int offsetDelta;
1531             final Type[] locals;
1532             AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1533                 this.frameType = frameType;
1534                 this.offsetDelta = offsetDelta;
1535                 this.locals = locals;
1536             }
1537             int getFrameType() { return frameType; }
1538             @Override
1539             void write(ClassWriter writer) {
1540                 super.write(writer);
1541                 writer.databuf.appendChar(offsetDelta);
1542                 if (writer.debugstackmap) {
1543                     System.out.print(" offset_delta=" + offsetDelta);
1544                 }
1545                 for (int i=0; i<locals.length; i++) {
1546                      if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1547                      writer.writeStackMapType(locals[i]);
1548                 }
1549             }
1550         }
1551 
1552         static class FullFrame extends StackMapTableFrame {
1553             final int offsetDelta;
1554             final Type[] locals;
1555             final Type[] stack;
1556             FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1557                 this.offsetDelta = offsetDelta;
1558                 this.locals = locals;
1559                 this.stack = stack;
1560             }
1561             int getFrameType() { return FULL_FRAME; }
1562             @Override
1563             void write(ClassWriter writer) {
1564                 super.write(writer);
1565                 writer.databuf.appendChar(offsetDelta);
1566                 writer.databuf.appendChar(locals.length);
1567                 if (writer.debugstackmap) {
1568                     System.out.print(" offset_delta=" + offsetDelta);
1569                     System.out.print(" nlocals=" + locals.length);
1570                 }
1571                 for (int i=0; i<locals.length; i++) {
1572                     if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1573                     writer.writeStackMapType(locals[i]);
1574                 }
1575 
1576                 writer.databuf.appendChar(stack.length);
1577                 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1578                 for (int i=0; i<stack.length; i++) {
1579                     if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1580                     writer.writeStackMapType(stack[i]);
1581                 }
1582             }
1583         }
1584 
1585        /** Compare this frame with the previous frame and produce
1586         *  an entry of compressed stack map frame. */
1587         static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1588                                               int prev_pc,
1589                                               Type[] prev_locals,
1590                                               Types types) {
1591             Type[] locals = this_frame.locals;
1592             Type[] stack = this_frame.stack;
1593             int offset_delta = this_frame.pc - prev_pc - 1;
1594             if (stack.length == 1) {
1595                 if (locals.length == prev_locals.length
1596                     && compare(prev_locals, locals, types) == 0) {
1597                     return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1598                 }
1599             } else if (stack.length == 0) {
1600                 int diff_length = compare(prev_locals, locals, types);
1601                 if (diff_length == 0) {
1602                     return new SameFrame(offset_delta);
1603                 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1604                     // APPEND
1605                     Type[] local_diff = new Type[-diff_length];
1606                     for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1607                         local_diff[j] = locals[i];
1608                     }
1609                     return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1610                                            offset_delta,
1611                                            local_diff);
1612                 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1613                     // CHOP
1614                     return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1615                                          offset_delta);
1616                 }
1617             }
1618             // FULL_FRAME
1619             return new FullFrame(offset_delta, locals, stack);
1620         }
1621 
1622         static boolean isInt(Type t) {
1623             return (t.getTag().isStrictSubRangeOf(INT)  || t.hasTag(BOOLEAN));
1624         }
1625 
1626         static boolean isSameType(Type t1, Type t2, Types types) {
1627             if (t1 == null) { return t2 == null; }
1628             if (t2 == null) { return false; }
1629 
1630             if (isInt(t1) && isInt(t2)) { return true; }
1631 
1632             if (t1.hasTag(UNINITIALIZED_THIS)) {
1633                 return t2.hasTag(UNINITIALIZED_THIS);
1634             } else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
1635                 if (t2.hasTag(UNINITIALIZED_OBJECT)) {
1636                     return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1637                 } else {
1638                     return false;
1639                 }
1640             } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
1641                 return false;
1642             }
1643 
1644             return types.isSameType(t1, t2);
1645         }
1646 
1647         static int compare(Type[] arr1, Type[] arr2, Types types) {
1648             int diff_length = arr1.length - arr2.length;
1649             if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1650                 return Integer.MAX_VALUE;
1651             }
1652             int len = (diff_length > 0) ? arr2.length : arr1.length;
1653             for (int i=0; i<len; i++) {
1654                 if (!isSameType(arr1[i], arr2[i], types)) {
1655                     return Integer.MAX_VALUE;
1656                 }
1657             }
1658             return diff_length;
1659         }
1660     }
1661 
1662     void writeFields(Scope.Entry e) {
1663         // process them in reverse sibling order;
1664         // i.e., process them in declaration order.
1665         List<VarSymbol> vars = List.nil();
1666         for (Scope.Entry i = e; i != null; i = i.sibling) {
1667             if (i.sym.kind == VAR) vars = vars.prepend((VarSymbol)i.sym);
1668         }
1669         while (vars.nonEmpty()) {
1670             writeField(vars.head);
1671             vars = vars.tail;
1672         }
1673     }
1674 
1675     void writeMethods(Scope.Entry e) {
1676         List<MethodSymbol> methods = List.nil();
1677         for (Scope.Entry i = e; i != null; i = i.sibling) {
1678             if (i.sym.kind == MTH && (i.sym.flags() & HYPOTHETICAL) == 0)
1679                 methods = methods.prepend((MethodSymbol)i.sym);
1680         }
1681         while (methods.nonEmpty()) {
1682             writeMethod(methods.head);
1683             methods = methods.tail;
1684         }
1685     }
1686 
1687     /** Emit a class file for a given class.
1688      *  @param c      The class from which a class file is generated.
1689      */
1690     public JavaFileObject writeClass(ClassSymbol c)
1691         throws IOException, PoolOverflow, StringOverflow
1692     {
1693         JavaFileObject outFile
1694             = fileManager.getJavaFileForOutput(CLASS_OUTPUT,
1695                                                c.flatname.toString(),
1696                                                JavaFileObject.Kind.CLASS,
1697                                                c.sourcefile);
1698         OutputStream out = outFile.openOutputStream();
1699         try {
1700             writeClassFile(out, c);
1701             if (verbose)
1702                 log.printVerbose("wrote.file", outFile);
1703             out.close();
1704             out = null;
1705         } finally {
1706             if (out != null) {
1707                 // if we are propogating an exception, delete the file
1708                 out.close();
1709                 outFile.delete();
1710                 outFile = null;
1711             }
1712         }
1713         return outFile; // may be null if write failed
1714     }
1715 
1716     /** Write class `c' to outstream `out'.
1717      */
1718     public void writeClassFile(OutputStream out, ClassSymbol c)
1719         throws IOException, PoolOverflow, StringOverflow {
1720         Assert.check((c.flags() & COMPOUND) == 0);
1721         databuf.reset();
1722         poolbuf.reset();
1723         sigbuf.reset();
1724         pool = c.pool;
1725         innerClasses = null;
1726         innerClassesQueue = null;
1727         bootstrapMethods = new LinkedHashMap<DynamicMethod, MethodHandle>();
1728 
1729         Type supertype = types.supertype(c.type);
1730         List<Type> interfaces = types.interfaces(c.type);
1731         List<Type> typarams = c.type.getTypeArguments();
1732 
1733         int flags = adjustFlags(c.flags() & ~DEFAULT);
1734         if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1735         flags = flags & ClassFlags & ~STRICTFP;
1736         if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
1737         if (c.isInner() && c.name.isEmpty()) flags &= ~FINAL;
1738         if (dumpClassModifiers) {
1739             PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1740             pw.println();
1741             pw.println("CLASSFILE  " + c.getQualifiedName());
1742             pw.println("---" + flagNames(flags));
1743         }
1744         databuf.appendChar(flags);
1745 
1746         databuf.appendChar(pool.put(c));
1747         databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0);
1748         databuf.appendChar(interfaces.length());
1749         for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1750             databuf.appendChar(pool.put(l.head.tsym));
1751         int fieldsCount = 0;
1752         int methodsCount = 0;
1753         for (Scope.Entry e = c.members().elems; e != null; e = e.sibling) {
1754             switch (e.sym.kind) {
1755             case VAR: fieldsCount++; break;
1756             case MTH: if ((e.sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1757                       break;
1758             case TYP: enterInner((ClassSymbol)e.sym); break;
1759             default : Assert.error();
1760             }
1761         }
1762 
1763         if (c.trans_local != null) {
1764             for (ClassSymbol local : c.trans_local) {
1765                 enterInner(local);
1766             }
1767         }
1768 
1769         databuf.appendChar(fieldsCount);
1770         writeFields(c.members().elems);
1771         databuf.appendChar(methodsCount);
1772         writeMethods(c.members().elems);
1773 
1774         int acountIdx = beginAttrs();
1775         int acount = 0;
1776 
1777         boolean sigReq =
1778             typarams.length() != 0 || supertype.allparams().length() != 0;
1779         for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1780             sigReq = l.head.allparams().length() != 0;
1781         if (sigReq) {
1782             Assert.check(source.allowGenerics());
1783             int alenIdx = writeAttr(names.Signature);
1784             if (typarams.length() != 0) assembleParamsSig(typarams);
1785             assembleSig(supertype);
1786             for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1787                 assembleSig(l.head);
1788             databuf.appendChar(pool.put(sigbuf.toName(names)));
1789             sigbuf.reset();
1790             endAttr(alenIdx);
1791             acount++;
1792         }
1793 
1794         if (c.sourcefile != null && emitSourceFile) {
1795             int alenIdx = writeAttr(names.SourceFile);
1796             // WHM 6/29/1999: Strip file path prefix.  We do it here at
1797             // the last possible moment because the sourcefile may be used
1798             // elsewhere in error diagnostics. Fixes 4241573.
1799             //databuf.appendChar(c.pool.put(c.sourcefile));
1800             String simpleName = BaseFileObject.getSimpleName(c.sourcefile);
1801             databuf.appendChar(c.pool.put(names.fromString(simpleName)));
1802             endAttr(alenIdx);
1803             acount++;
1804         }
1805 
1806         if (genCrt) {
1807             // Append SourceID attribute
1808             int alenIdx = writeAttr(names.SourceID);
1809             databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1810             endAttr(alenIdx);
1811             acount++;
1812             // Append CompilationID attribute
1813             alenIdx = writeAttr(names.CompilationID);
1814             databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis()))));
1815             endAttr(alenIdx);
1816             acount++;
1817         }
1818 
1819         acount += writeFlagAttrs(c.flags());
1820         acount += writeJavaAnnotations(c.getRawAttributes());
1821         acount += writeTypeAnnotations(c.getRawTypeAttributes());
1822         acount += writeEnclosingMethodAttribute(c);
1823         acount += writeExtraClassAttributes(c);
1824 
1825         poolbuf.appendInt(JAVA_MAGIC);
1826         poolbuf.appendChar(target.minorVersion);
1827         poolbuf.appendChar(target.majorVersion);
1828 
1829         writePool(c.pool);
1830 
1831         if (innerClasses != null) {
1832             writeInnerClasses();
1833             acount++;
1834         }
1835 
1836         if (!bootstrapMethods.isEmpty()) {
1837             writeBootstrapMethods();
1838             acount++;
1839         }
1840 
1841         endAttrs(acountIdx, acount);
1842 
1843         poolbuf.appendBytes(databuf.elems, 0, databuf.length);
1844         out.write(poolbuf.elems, 0, poolbuf.length);
1845 
1846         pool = c.pool = null; // to conserve space
1847      }
1848 
1849     /**Allows subclasses to write additional class attributes
1850      *
1851      * @return the number of attributes written
1852      */
1853     protected int writeExtraClassAttributes(ClassSymbol c) {
1854         return 0;
1855     }
1856 
1857     int adjustFlags(final long flags) {
1858         int result = (int)flags;
1859         if ((flags & SYNTHETIC) != 0  && !target.useSyntheticFlag())
1860             result &= ~SYNTHETIC;
1861         if ((flags & ENUM) != 0  && !target.useEnumFlag())
1862             result &= ~ENUM;
1863         if ((flags & ANNOTATION) != 0  && !target.useAnnotationFlag())
1864             result &= ~ANNOTATION;
1865 
1866         if ((flags & BRIDGE) != 0  && target.useBridgeFlag())
1867             result |= ACC_BRIDGE;
1868         if ((flags & VARARGS) != 0  && target.useVarargsFlag())
1869             result |= ACC_VARARGS;
1870         if ((flags & DEFAULT) != 0)
1871             result &= ~ABSTRACT;
1872         return result;
1873     }
1874 
1875     long getLastModified(FileObject filename) {
1876         long mod = 0;
1877         try {
1878             mod = filename.getLastModified();
1879         } catch (SecurityException e) {
1880             throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage());
1881         }
1882         return mod;
1883     }
1884 }