1 /*
   2  * Copyright (c) 1999, 2017, 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 import java.util.LinkedHashSet;
  34 import java.util.stream.Collectors;
  35 
  36 import javax.tools.JavaFileManager;
  37 import javax.tools.FileObject;
  38 import javax.tools.JavaFileManager.Location;
  39 import javax.tools.JavaFileObject;
  40 
  41 import com.sun.tools.javac.code.*;
  42 import com.sun.tools.javac.code.Attribute.RetentionPolicy;
  43 import com.sun.tools.javac.code.Directive.*;
  44 import com.sun.tools.javac.code.Symbol.*;
  45 import com.sun.tools.javac.code.Type.*;
  46 import com.sun.tools.javac.code.Types.UniqueType;
  47 import com.sun.tools.javac.file.PathFileObject;
  48 import com.sun.tools.javac.jvm.Pool.DynamicMethod;
  49 import com.sun.tools.javac.jvm.Pool.Method;
  50 import com.sun.tools.javac.jvm.Pool.MethodHandle;
  51 import com.sun.tools.javac.jvm.Pool.Variable;
  52 import com.sun.tools.javac.main.Option;
  53 import com.sun.tools.javac.util.*;
  54 
  55 import static com.sun.tools.javac.code.Flags.*;
  56 import static com.sun.tools.javac.code.Kinds.Kind.*;
  57 import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
  58 import static com.sun.tools.javac.code.TypeTag.*;
  59 import static com.sun.tools.javac.main.Option.*;
  60 
  61 import static javax.tools.StandardLocation.CLASS_OUTPUT;
  62 
  63 /** This class provides operations to map an internal symbol table graph
  64  *  rooted in a ClassSymbol into a classfile.
  65  *
  66  *  <p><b>This is NOT part of any supported API.
  67  *  If you write code that depends on this, you do so at your own risk.
  68  *  This code and its internal interfaces are subject to change or
  69  *  deletion without notice.</b>
  70  */
  71 public class ClassWriter extends ClassFile {
  72     protected static final Context.Key<ClassWriter> classWriterKey = new Context.Key<>();
  73 
  74     private final Options options;
  75 
  76     /** Switch: verbose output.
  77      */
  78     private boolean verbose;
  79 
  80     /** Switch: emit source file attribute.
  81      */
  82     private boolean emitSourceFile;
  83 
  84     /** Switch: generate CharacterRangeTable attribute.
  85      */
  86     private boolean genCrt;
  87 
  88     /** Switch: describe the generated stackmap.
  89      */
  90     private boolean debugstackmap;
  91 
  92     /**
  93      * Target class version.
  94      */
  95     private Target target;
  96 
  97     /**
  98      * Source language version.
  99      */
 100     private Source source;
 101 
 102     /** Type utilities. */
 103     private Types types;
 104 
 105     /**
 106      * If true, class files will be written in module-specific subdirectories
 107      * of the CLASS_OUTPUT location.
 108      */
 109     public boolean multiModuleMode;
 110 
 111     /** The initial sizes of the data and constant pool buffers.
 112      *  Sizes are increased when buffers get full.
 113      */
 114     static final int DATA_BUF_SIZE = 0x0fff0;
 115     static final int POOL_BUF_SIZE = 0x1fff0;
 116 
 117     /** An output buffer for member info.
 118      */
 119     ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE);
 120 
 121     /** An output buffer for the constant pool.
 122      */
 123     ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE);
 124 
 125     /** The constant pool.
 126      */
 127     Pool pool;
 128 
 129     /** The inner classes to be written, as a set.
 130      */
 131     Set<ClassSymbol> innerClasses;
 132 
 133     /** The inner classes to be written, as a queue where
 134      *  enclosing classes come first.
 135      */
 136     ListBuffer<ClassSymbol> innerClassesQueue;
 137 
 138     /** The bootstrap methods to be written in the corresponding class attribute
 139      *  (one for each invokedynamic)
 140      */
 141     Map<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> bootstrapMethods;
 142 
 143     /** The log to use for verbose output.
 144      */
 145     private final Log log;
 146 
 147     /** The name table. */
 148     private final Names names;
 149 
 150     /** Access to files. */
 151     private final JavaFileManager fileManager;
 152 
 153     /** Sole signature generator */
 154     private final CWSignatureGenerator signatureGen;
 155 
 156     /** The tags and constants used in compressed stackmap. */
 157     static final int SAME_FRAME_SIZE = 64;
 158     static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;
 159     static final int SAME_FRAME_EXTENDED = 251;
 160     static final int FULL_FRAME = 255;
 161     static final int MAX_LOCAL_LENGTH_DIFF = 4;
 162 
 163     /** Get the ClassWriter instance for this context. */
 164     public static ClassWriter instance(Context context) {
 165         ClassWriter instance = context.get(classWriterKey);
 166         if (instance == null)
 167             instance = new ClassWriter(context);
 168         return instance;
 169     }
 170 
 171     /** Construct a class writer, given an options table.
 172      */
 173     protected ClassWriter(Context context) {
 174         context.put(classWriterKey, this);
 175 
 176         log = Log.instance(context);
 177         names = Names.instance(context);
 178         options = Options.instance(context);
 179         target = Target.instance(context);
 180         source = Source.instance(context);
 181         types = Types.instance(context);
 182         fileManager = context.get(JavaFileManager.class);
 183         signatureGen = new CWSignatureGenerator(types);
 184 
 185         verbose        = options.isSet(VERBOSE);
 186         genCrt         = options.isSet(XJCOV);
 187         debugstackmap = options.isSet("debug.stackmap");
 188 
 189         emitSourceFile = options.isUnset(G_CUSTOM) ||
 190                             options.isSet(G_CUSTOM, "source");
 191 
 192         String modifierFlags = options.get("debug.dumpmodifiers");
 193         if (modifierFlags != null) {
 194             dumpClassModifiers = modifierFlags.indexOf('c') != -1;
 195             dumpFieldModifiers = modifierFlags.indexOf('f') != -1;
 196             dumpInnerClassModifiers = modifierFlags.indexOf('i') != -1;
 197             dumpMethodModifiers = modifierFlags.indexOf('m') != -1;
 198         }
 199     }
 200 
 201 /******************************************************************
 202  * Diagnostics: dump generated class names and modifiers
 203  ******************************************************************/
 204 
 205     /** Value of option 'dumpmodifiers' is a string
 206      *  indicating which modifiers should be dumped for debugging:
 207      *    'c' -- classes
 208      *    'f' -- fields
 209      *    'i' -- innerclass attributes
 210      *    'm' -- methods
 211      *  For example, to dump everything:
 212      *    javac -XDdumpmodifiers=cifm MyProg.java
 213      */
 214     private boolean dumpClassModifiers; // -XDdumpmodifiers=c
 215     private boolean dumpFieldModifiers; // -XDdumpmodifiers=f
 216     private boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i
 217     private boolean dumpMethodModifiers; // -XDdumpmodifiers=m
 218 
 219 
 220     /** Return flags as a string, separated by " ".
 221      */
 222     public static String flagNames(long flags) {
 223         StringBuilder sbuf = new StringBuilder();
 224         int i = 0;
 225         long f = flags & StandardFlags;
 226         while (f != 0) {
 227             if ((f & 1) != 0) {
 228                 sbuf.append(" ");
 229                 sbuf.append(flagName[i]);
 230             }
 231             f = f >> 1;
 232             i++;
 233         }
 234         return sbuf.toString();
 235     }
 236     //where
 237         private final static String[] flagName = {
 238             "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL",
 239             "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE",
 240             "ABSTRACT", "STRICTFP"};
 241 
 242 /******************************************************************
 243  * Output routines
 244  ******************************************************************/
 245 
 246     /** Write a character into given byte buffer;
 247      *  byte buffer will not be grown.
 248      */
 249     void putChar(ByteBuffer buf, int op, int x) {
 250         buf.elems[op  ] = (byte)((x >>  8) & 0xFF);
 251         buf.elems[op+1] = (byte)((x      ) & 0xFF);
 252     }
 253 
 254     /** Write an integer into given byte buffer;
 255      *  byte buffer will not be grown.
 256      */
 257     void putInt(ByteBuffer buf, int adr, int x) {
 258         buf.elems[adr  ] = (byte)((x >> 24) & 0xFF);
 259         buf.elems[adr+1] = (byte)((x >> 16) & 0xFF);
 260         buf.elems[adr+2] = (byte)((x >>  8) & 0xFF);
 261         buf.elems[adr+3] = (byte)((x      ) & 0xFF);
 262     }
 263 
 264     /**
 265      * Signature Generation
 266      */
 267     private class CWSignatureGenerator extends Types.SignatureGenerator {
 268 
 269         /**
 270          * An output buffer for type signatures.
 271          */
 272         ByteBuffer sigbuf = new ByteBuffer();
 273 
 274         CWSignatureGenerator(Types types) {
 275             super(types);
 276         }
 277 
 278         /**
 279          * Assemble signature of given type in string buffer.
 280          * Check for uninitialized types before calling the general case.
 281          */
 282         @Override
 283         public void assembleSig(Type type) {
 284             switch (type.getTag()) {
 285                 case UNINITIALIZED_THIS:
 286                 case UNINITIALIZED_OBJECT:
 287                     // we don't yet have a spec for uninitialized types in the
 288                     // local variable table
 289                     assembleSig(types.erasure(((UninitializedType)type).qtype));
 290                     break;
 291                 default:
 292                     super.assembleSig(type);
 293             }
 294         }
 295 
 296         @Override
 297         protected void append(char ch) {
 298             sigbuf.appendByte(ch);
 299         }
 300 
 301         @Override
 302         protected void append(byte[] ba) {
 303             sigbuf.appendBytes(ba);
 304         }
 305 
 306         @Override
 307         protected void append(Name name) {
 308             sigbuf.appendName(name);
 309         }
 310 
 311         @Override
 312         protected void classReference(ClassSymbol c) {
 313             enterInner(c);
 314         }
 315 
 316         private void reset() {
 317             sigbuf.reset();
 318         }
 319 
 320         private Name toName() {
 321             return sigbuf.toName(names);
 322         }
 323 
 324         private boolean isEmpty() {
 325             return sigbuf.length == 0;
 326         }
 327     }
 328 
 329     /**
 330      * Return signature of given type
 331      */
 332     Name typeSig(Type type) {
 333         Assert.check(signatureGen.isEmpty());
 334         //- System.out.println(" ? " + type);
 335         signatureGen.assembleSig(type);
 336         Name n = signatureGen.toName();
 337         signatureGen.reset();
 338         //- System.out.println("   " + n);
 339         return n;
 340     }
 341 
 342     /** Given a type t, return the extended class name of its erasure in
 343      *  external representation.
 344      */
 345     public Name xClassName(Type t) {
 346         if (t.hasTag(CLASS)) {
 347             return names.fromUtf(externalize(t.tsym.flatName()));
 348         } else if (t.hasTag(ARRAY)) {
 349             return typeSig(types.erasure(t));
 350         } else {
 351             throw new AssertionError("xClassName expects class or array type, got " + t);
 352         }
 353     }
 354 
 355 /******************************************************************
 356  * Writing the Constant Pool
 357  ******************************************************************/
 358 
 359     /** Thrown when the constant pool is over full.
 360      */
 361     public static class PoolOverflow extends Exception {
 362         private static final long serialVersionUID = 0;
 363         public PoolOverflow() {}
 364     }
 365     public static class StringOverflow extends Exception {
 366         private static final long serialVersionUID = 0;
 367         public final String value;
 368         public StringOverflow(String s) {
 369             value = s;
 370         }
 371     }
 372 
 373     /** Write constant pool to pool buffer.
 374      *  Note: during writing, constant pool
 375      *  might grow since some parts of constants still need to be entered.
 376      */
 377     void writePool(Pool pool) throws PoolOverflow, StringOverflow {
 378         int poolCountIdx = poolbuf.length;
 379         poolbuf.appendChar(0);
 380         int i = 1;
 381         while (i < pool.pp) {
 382             Object value = pool.pool[i];
 383             Assert.checkNonNull(value);
 384             if (value instanceof Method || value instanceof Variable)
 385                 value = ((DelegatedSymbol)value).getUnderlyingSymbol();
 386 
 387             if (value instanceof MethodSymbol) {
 388                 MethodSymbol m = (MethodSymbol)value;
 389                 if (!m.isDynamic()) {
 390                     poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0
 391                               ? CONSTANT_InterfaceMethodref
 392                               : CONSTANT_Methodref);
 393                     poolbuf.appendChar(pool.put(m.owner));
 394                     poolbuf.appendChar(pool.put(nameType(m)));
 395                 } else {
 396                     //invokedynamic
 397                     DynamicMethodSymbol dynSym = (DynamicMethodSymbol)m;
 398                     MethodHandle handle = new MethodHandle(dynSym.bsmKind, dynSym.bsm, types);
 399                     DynamicMethod.BootstrapMethodsKey key = new DynamicMethod.BootstrapMethodsKey(dynSym, types);
 400 
 401                     // Figure out the index for existing BSM; create a new BSM if no key
 402                     DynamicMethod.BootstrapMethodsValue val = bootstrapMethods.get(key);
 403                     if (val == null) {
 404                         int index = bootstrapMethods.size();
 405                         val = new DynamicMethod.BootstrapMethodsValue(handle, index);
 406                         bootstrapMethods.put(key, val);
 407                     }
 408 
 409                     //init cp entries
 410                     pool.put(names.BootstrapMethods);
 411                     pool.put(handle);
 412                     for (Object staticArg : dynSym.staticArgs) {
 413                         pool.put(staticArg);
 414                     }
 415                     poolbuf.appendByte(CONSTANT_InvokeDynamic);
 416                     poolbuf.appendChar(val.index);
 417                     poolbuf.appendChar(pool.put(nameType(dynSym)));
 418                 }
 419             } else if (value instanceof VarSymbol) {
 420                 VarSymbol v = (VarSymbol)value;
 421                 poolbuf.appendByte(CONSTANT_Fieldref);
 422                 poolbuf.appendChar(pool.put(v.owner));
 423                 poolbuf.appendChar(pool.put(nameType(v)));
 424             } else if (value instanceof Name) {
 425                 poolbuf.appendByte(CONSTANT_Utf8);
 426                 byte[] bs = ((Name)value).toUtf();
 427                 poolbuf.appendChar(bs.length);
 428                 poolbuf.appendBytes(bs, 0, bs.length);
 429                 if (bs.length > Pool.MAX_STRING_LENGTH)
 430                     throw new StringOverflow(value.toString());
 431             } else if (value instanceof ClassSymbol) {
 432                 ClassSymbol c = (ClassSymbol)value;
 433                 if (c.owner.kind == TYP) pool.put(c.owner);
 434                 poolbuf.appendByte(CONSTANT_Class);
 435                 if (c.type.hasTag(ARRAY)) {
 436                     poolbuf.appendChar(pool.put(typeSig(c.type)));
 437                 } else {
 438                     poolbuf.appendChar(pool.put(names.fromUtf(externalize(c.flatname))));
 439                     enterInner(c);
 440                 }
 441             } else if (value instanceof NameAndType) {
 442                 NameAndType nt = (NameAndType)value;
 443                 poolbuf.appendByte(CONSTANT_NameandType);
 444                 poolbuf.appendChar(pool.put(nt.name));
 445                 poolbuf.appendChar(pool.put(typeSig(nt.uniqueType.type)));
 446             } else if (value instanceof Integer) {
 447                 poolbuf.appendByte(CONSTANT_Integer);
 448                 poolbuf.appendInt(((Integer)value).intValue());
 449             } else if (value instanceof Long) {
 450                 poolbuf.appendByte(CONSTANT_Long);
 451                 poolbuf.appendLong(((Long)value).longValue());
 452                 i++;
 453             } else if (value instanceof Float) {
 454                 poolbuf.appendByte(CONSTANT_Float);
 455                 poolbuf.appendFloat(((Float)value).floatValue());
 456             } else if (value instanceof Double) {
 457                 poolbuf.appendByte(CONSTANT_Double);
 458                 poolbuf.appendDouble(((Double)value).doubleValue());
 459                 i++;
 460             } else if (value instanceof String) {
 461                 poolbuf.appendByte(CONSTANT_String);
 462                 poolbuf.appendChar(pool.put(names.fromString((String)value)));
 463             } else if (value instanceof UniqueType) {
 464                 Type type = ((UniqueType)value).type;
 465                 if (type.hasTag(METHOD)) {
 466                     poolbuf.appendByte(CONSTANT_MethodType);
 467                     poolbuf.appendChar(pool.put(typeSig((MethodType)type)));
 468                 } else {
 469                     Assert.check(type.hasTag(ARRAY));
 470                     poolbuf.appendByte(CONSTANT_Class);
 471                     poolbuf.appendChar(pool.put(xClassName(type)));
 472                 }
 473             } else if (value instanceof MethodHandle) {
 474                 MethodHandle ref = (MethodHandle)value;
 475                 poolbuf.appendByte(CONSTANT_MethodHandle);
 476                 poolbuf.appendByte(ref.refKind);
 477                 poolbuf.appendChar(pool.put(ref.refSym));
 478             } else if (value instanceof ModuleSymbol) {
 479                 ModuleSymbol m = (ModuleSymbol)value;
 480                 poolbuf.appendByte(CONSTANT_Module);
 481                 poolbuf.appendChar(pool.put(m.name));
 482             } else if (value instanceof PackageSymbol) {
 483                 PackageSymbol m = (PackageSymbol)value;
 484                 poolbuf.appendByte(CONSTANT_Package);
 485                 poolbuf.appendChar(pool.put(names.fromUtf(externalize(m.fullname))));
 486             } else {
 487                 Assert.error("writePool " + value);
 488             }
 489             i++;
 490         }
 491         if (pool.pp > Pool.MAX_ENTRIES)
 492             throw new PoolOverflow();
 493         putChar(poolbuf, poolCountIdx, pool.pp);
 494     }
 495 
 496     /** Given a symbol, return its name-and-type.
 497      */
 498     NameAndType nameType(Symbol sym) {
 499         return new NameAndType(sym.name, sym.externalType(types), types);
 500         // the NameAndType is generated from a symbol reference, and the
 501         // adjustment of adding an additional this$n parameter needs to be made.
 502     }
 503 
 504 /******************************************************************
 505  * Writing Attributes
 506  ******************************************************************/
 507 
 508     /** Write header for an attribute to data buffer and return
 509      *  position past attribute length index.
 510      */
 511     int writeAttr(Name attrName) {
 512         databuf.appendChar(pool.put(attrName));
 513         databuf.appendInt(0);
 514         return databuf.length;
 515     }
 516 
 517     /** Fill in attribute length.
 518      */
 519     void endAttr(int index) {
 520         putInt(databuf, index - 4, databuf.length - index);
 521     }
 522 
 523     /** Leave space for attribute count and return index for
 524      *  number of attributes field.
 525      */
 526     int beginAttrs() {
 527         databuf.appendChar(0);
 528         return databuf.length;
 529     }
 530 
 531     /** Fill in number of attributes.
 532      */
 533     void endAttrs(int index, int count) {
 534         putChar(databuf, index - 2, count);
 535     }
 536 
 537     /** Write the EnclosingMethod attribute if needed.
 538      *  Returns the number of attributes written (0 or 1).
 539      */
 540     int writeEnclosingMethodAttribute(ClassSymbol c) {
 541         return writeEnclosingMethodAttribute(names.EnclosingMethod, c);
 542     }
 543 
 544     /** Write the EnclosingMethod attribute with a specified name.
 545      *  Returns the number of attributes written (0 or 1).
 546      */
 547     protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) {
 548         if (c.owner.kind != MTH && // neither a local class
 549             c.name != names.empty) // nor anonymous
 550             return 0;
 551 
 552         int alenIdx = writeAttr(attributeName);
 553         ClassSymbol enclClass = c.owner.enclClass();
 554         MethodSymbol enclMethod =
 555             (c.owner.type == null // local to init block
 556              || c.owner.kind != MTH) // or member init
 557             ? null
 558             : (MethodSymbol)c.owner;
 559         databuf.appendChar(pool.put(enclClass));
 560         databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner)));
 561         endAttr(alenIdx);
 562         return 1;
 563     }
 564 
 565     /** Write flag attributes; return number of attributes written.
 566      */
 567     int writeFlagAttrs(long flags) {
 568         int acount = 0;
 569         if ((flags & DEPRECATED) != 0) {
 570             int alenIdx = writeAttr(names.Deprecated);
 571             endAttr(alenIdx);
 572             acount++;
 573         }
 574         return acount;
 575     }
 576 
 577     /** Write member (field or method) attributes;
 578      *  return number of attributes written.
 579      */
 580     int writeMemberAttrs(Symbol sym) {
 581         int acount = writeFlagAttrs(sym.flags());
 582         long flags = sym.flags();
 583         if ((flags & (SYNTHETIC | BRIDGE)) != SYNTHETIC &&
 584             (flags & ANONCONSTR) == 0 &&
 585             (!types.isSameType(sym.type, sym.erasure(types)) ||
 586              signatureGen.hasTypeVar(sym.type.getThrownTypes()))) {
 587             // note that a local class with captured variables
 588             // will get a signature attribute
 589             int alenIdx = writeAttr(names.Signature);
 590             databuf.appendChar(pool.put(typeSig(sym.type)));
 591             endAttr(alenIdx);
 592             acount++;
 593         }
 594         acount += writeJavaAnnotations(sym.getRawAttributes());
 595         acount += writeTypeAnnotations(sym.getRawTypeAttributes(), false);
 596         return acount;
 597     }
 598 
 599     /**
 600      * Write method parameter names attribute.
 601      */
 602     int writeMethodParametersAttr(MethodSymbol m) {
 603         MethodType ty = m.externalType(types).asMethodType();
 604         final int allparams = ty.argtypes.size();
 605         if (m.params != null && allparams != 0) {
 606             final int attrIndex = writeAttr(names.MethodParameters);
 607             databuf.appendByte(allparams);
 608             // Write extra parameters first
 609             for (VarSymbol s : m.extraParams) {
 610                 final int flags =
 611                     ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
 612                     ((int) m.flags() & SYNTHETIC);
 613                 databuf.appendChar(pool.put(s.name));
 614                 databuf.appendChar(flags);
 615             }
 616             // Now write the real parameters
 617             for (VarSymbol s : m.params) {
 618                 final int flags =
 619                     ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
 620                     ((int) m.flags() & SYNTHETIC);
 621                 databuf.appendChar(pool.put(s.name));
 622                 databuf.appendChar(flags);
 623             }
 624             // Now write the captured locals
 625             for (VarSymbol s : m.capturedLocals) {
 626                 final int flags =
 627                     ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
 628                     ((int) m.flags() & SYNTHETIC);
 629                 databuf.appendChar(pool.put(s.name));
 630                 databuf.appendChar(flags);
 631             }
 632             endAttr(attrIndex);
 633             return 1;
 634         } else
 635             return 0;
 636     }
 637 
 638 
 639     private void writeParamAnnotations(List<VarSymbol> params,
 640                                        RetentionPolicy retention) {
 641         for (VarSymbol s : params) {
 642             ListBuffer<Attribute.Compound> buf = new ListBuffer<>();
 643             for (Attribute.Compound a : s.getRawAttributes())
 644                 if (types.getRetention(a) == retention)
 645                     buf.append(a);
 646             databuf.appendChar(buf.length());
 647             for (Attribute.Compound a : buf)
 648                 writeCompoundAttribute(a);
 649         }
 650 
 651     }
 652 
 653     private void writeParamAnnotations(MethodSymbol m,
 654                                        RetentionPolicy retention) {
 655         databuf.appendByte(m.params.length());
 656         writeParamAnnotations(m.params, retention);
 657     }
 658 
 659     /** Write method parameter annotations;
 660      *  return number of attributes written.
 661      */
 662     int writeParameterAttrs(MethodSymbol m) {
 663         boolean hasVisible = false;
 664         boolean hasInvisible = false;
 665         if (m.params != null) {
 666             for (VarSymbol s : m.params) {
 667                 for (Attribute.Compound a : s.getRawAttributes()) {
 668                     switch (types.getRetention(a)) {
 669                     case SOURCE: break;
 670                     case CLASS: hasInvisible = true; break;
 671                     case RUNTIME: hasVisible = true; break;
 672                     default: // /* fail soft */ throw new AssertionError(vis);
 673                     }
 674                 }
 675             }
 676         }
 677 
 678         int attrCount = 0;
 679         if (hasVisible) {
 680             int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
 681             writeParamAnnotations(m, RetentionPolicy.RUNTIME);
 682             endAttr(attrIndex);
 683             attrCount++;
 684         }
 685         if (hasInvisible) {
 686             int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
 687             writeParamAnnotations(m, RetentionPolicy.CLASS);
 688             endAttr(attrIndex);
 689             attrCount++;
 690         }
 691         return attrCount;
 692     }
 693 
 694 /**********************************************************************
 695  * Writing Java-language annotations (aka metadata, attributes)
 696  **********************************************************************/
 697 
 698     /** Write Java-language annotations; return number of JVM
 699      *  attributes written (zero or one).
 700      */
 701     int writeJavaAnnotations(List<Attribute.Compound> attrs) {
 702         if (attrs.isEmpty()) return 0;
 703         ListBuffer<Attribute.Compound> visibles = new ListBuffer<>();
 704         ListBuffer<Attribute.Compound> invisibles = new ListBuffer<>();
 705         for (Attribute.Compound a : attrs) {
 706             switch (types.getRetention(a)) {
 707             case SOURCE: break;
 708             case CLASS: invisibles.append(a); break;
 709             case RUNTIME: visibles.append(a); break;
 710             default: // /* fail soft */ throw new AssertionError(vis);
 711             }
 712         }
 713 
 714         int attrCount = 0;
 715         if (visibles.length() != 0) {
 716             int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
 717             databuf.appendChar(visibles.length());
 718             for (Attribute.Compound a : visibles)
 719                 writeCompoundAttribute(a);
 720             endAttr(attrIndex);
 721             attrCount++;
 722         }
 723         if (invisibles.length() != 0) {
 724             int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
 725             databuf.appendChar(invisibles.length());
 726             for (Attribute.Compound a : invisibles)
 727                 writeCompoundAttribute(a);
 728             endAttr(attrIndex);
 729             attrCount++;
 730         }
 731         return attrCount;
 732     }
 733 
 734     int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos, boolean inCode) {
 735         if (typeAnnos.isEmpty()) return 0;
 736 
 737         ListBuffer<Attribute.TypeCompound> visibles = new ListBuffer<>();
 738         ListBuffer<Attribute.TypeCompound> invisibles = new ListBuffer<>();
 739 
 740         for (Attribute.TypeCompound tc : typeAnnos) {
 741             if (tc.hasUnknownPosition()) {
 742                 boolean fixed = tc.tryFixPosition();
 743 
 744                 // Could we fix it?
 745                 if (!fixed) {
 746                     // This happens for nested types like @A Outer. @B Inner.
 747                     // For method parameters we get the annotation twice! Once with
 748                     // a valid position, once unknown.
 749                     // TODO: find a cleaner solution.
 750                     PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
 751                     pw.println("ClassWriter: Position UNKNOWN in type annotation: " + tc);
 752                     continue;
 753                 }
 754             }
 755 
 756             if (tc.position.type.isLocal() != inCode)
 757                 continue;
 758             if (!tc.position.emitToClassfile())
 759                 continue;
 760             switch (types.getRetention(tc)) {
 761             case SOURCE: break;
 762             case CLASS: invisibles.append(tc); break;
 763             case RUNTIME: visibles.append(tc); break;
 764             default: // /* fail soft */ throw new AssertionError(vis);
 765             }
 766         }
 767 
 768         int attrCount = 0;
 769         if (visibles.length() != 0) {
 770             int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations);
 771             databuf.appendChar(visibles.length());
 772             for (Attribute.TypeCompound p : visibles)
 773                 writeTypeAnnotation(p);
 774             endAttr(attrIndex);
 775             attrCount++;
 776         }
 777 
 778         if (invisibles.length() != 0) {
 779             int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations);
 780             databuf.appendChar(invisibles.length());
 781             for (Attribute.TypeCompound p : invisibles)
 782                 writeTypeAnnotation(p);
 783             endAttr(attrIndex);
 784             attrCount++;
 785         }
 786 
 787         return attrCount;
 788     }
 789 
 790     /** A visitor to write an attribute including its leading
 791      *  single-character marker.
 792      */
 793     class AttributeWriter implements Attribute.Visitor {
 794         public void visitConstant(Attribute.Constant _value) {
 795             Object value = _value.value;
 796             switch (_value.type.getTag()) {
 797             case BYTE:
 798                 databuf.appendByte('B');
 799                 break;
 800             case CHAR:
 801                 databuf.appendByte('C');
 802                 break;
 803             case SHORT:
 804                 databuf.appendByte('S');
 805                 break;
 806             case INT:
 807                 databuf.appendByte('I');
 808                 break;
 809             case LONG:
 810                 databuf.appendByte('J');
 811                 break;
 812             case FLOAT:
 813                 databuf.appendByte('F');
 814                 break;
 815             case DOUBLE:
 816                 databuf.appendByte('D');
 817                 break;
 818             case BOOLEAN:
 819                 databuf.appendByte('Z');
 820                 break;
 821             case CLASS:
 822                 Assert.check(value instanceof String);
 823                 databuf.appendByte('s');
 824                 value = names.fromString(value.toString()); // CONSTANT_Utf8
 825                 break;
 826             default:
 827                 throw new AssertionError(_value.type);
 828             }
 829             databuf.appendChar(pool.put(value));
 830         }
 831         public void visitEnum(Attribute.Enum e) {
 832             databuf.appendByte('e');
 833             databuf.appendChar(pool.put(typeSig(e.value.type)));
 834             databuf.appendChar(pool.put(e.value.name));
 835         }
 836         public void visitClass(Attribute.Class clazz) {
 837             databuf.appendByte('c');
 838             databuf.appendChar(pool.put(typeSig(types.erasure(clazz.classType))));
 839         }
 840         public void visitCompound(Attribute.Compound compound) {
 841             databuf.appendByte('@');
 842             writeCompoundAttribute(compound);
 843         }
 844         public void visitError(Attribute.Error x) {
 845             throw new AssertionError(x);
 846         }
 847         public void visitArray(Attribute.Array array) {
 848             databuf.appendByte('[');
 849             databuf.appendChar(array.values.length);
 850             for (Attribute a : array.values) {
 851                 a.accept(this);
 852             }
 853         }
 854     }
 855     AttributeWriter awriter = new AttributeWriter();
 856 
 857     /** Write a compound attribute excluding the '@' marker. */
 858     void writeCompoundAttribute(Attribute.Compound c) {
 859         databuf.appendChar(pool.put(typeSig(c.type)));
 860         databuf.appendChar(c.values.length());
 861         for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
 862             databuf.appendChar(pool.put(p.fst.name));
 863             p.snd.accept(awriter);
 864         }
 865     }
 866 
 867     void writeTypeAnnotation(Attribute.TypeCompound c) {
 868         writePosition(c.position);
 869         writeCompoundAttribute(c);
 870     }
 871 
 872     void writePosition(TypeAnnotationPosition p) {
 873         databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte
 874         switch (p.type) {
 875         // instanceof
 876         case INSTANCEOF:
 877         // new expression
 878         case NEW:
 879         // constructor/method reference receiver
 880         case CONSTRUCTOR_REFERENCE:
 881         case METHOD_REFERENCE:
 882             databuf.appendChar(p.offset);
 883             break;
 884         // local variable
 885         case LOCAL_VARIABLE:
 886         // resource variable
 887         case RESOURCE_VARIABLE:
 888             databuf.appendChar(p.lvarOffset.length);  // for table length
 889             for (int i = 0; i < p.lvarOffset.length; ++i) {
 890                 databuf.appendChar(p.lvarOffset[i]);
 891                 databuf.appendChar(p.lvarLength[i]);
 892                 databuf.appendChar(p.lvarIndex[i]);
 893             }
 894             break;
 895         // exception parameter
 896         case EXCEPTION_PARAMETER:
 897             databuf.appendChar(p.getExceptionIndex());
 898             break;
 899         // method receiver
 900         case METHOD_RECEIVER:
 901             // Do nothing
 902             break;
 903         // type parameter
 904         case CLASS_TYPE_PARAMETER:
 905         case METHOD_TYPE_PARAMETER:
 906             databuf.appendByte(p.parameter_index);
 907             break;
 908         // type parameter bound
 909         case CLASS_TYPE_PARAMETER_BOUND:
 910         case METHOD_TYPE_PARAMETER_BOUND:
 911             databuf.appendByte(p.parameter_index);
 912             databuf.appendByte(p.bound_index);
 913             break;
 914         // class extends or implements clause
 915         case CLASS_EXTENDS:
 916             databuf.appendChar(p.type_index);
 917             break;
 918         // throws
 919         case THROWS:
 920             databuf.appendChar(p.type_index);
 921             break;
 922         // method parameter
 923         case METHOD_FORMAL_PARAMETER:
 924             databuf.appendByte(p.parameter_index);
 925             break;
 926         // type cast
 927         case CAST:
 928         // method/constructor/reference type argument
 929         case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
 930         case METHOD_INVOCATION_TYPE_ARGUMENT:
 931         case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT:
 932         case METHOD_REFERENCE_TYPE_ARGUMENT:
 933             databuf.appendChar(p.offset);
 934             databuf.appendByte(p.type_index);
 935             break;
 936         // We don't need to worry about these
 937         case METHOD_RETURN:
 938         case FIELD:
 939             break;
 940         case UNKNOWN:
 941             throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!");
 942         default:
 943             throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p);
 944         }
 945 
 946         { // Append location data for generics/arrays.
 947             databuf.appendByte(p.location.size());
 948             java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location);
 949             for (int i : loc)
 950                 databuf.appendByte((byte)i);
 951         }
 952     }
 953 
 954 /**********************************************************************
 955  * Writing module attributes
 956  **********************************************************************/
 957 
 958     /** Write the Module attribute if needed.
 959      *  Returns the number of attributes written (0 or 1).
 960      */
 961     int writeModuleAttribute(ClassSymbol c) {
 962         ModuleSymbol m = (ModuleSymbol) c.owner;
 963 
 964         int alenIdx = writeAttr(names.Module);
 965 
 966         databuf.appendChar(pool.put(m));
 967         databuf.appendChar(ModuleFlags.value(m.flags)); // module_flags
 968         databuf.appendChar(m.version != null ? pool.put(m.version) : 0);
 969 
 970         ListBuffer<RequiresDirective> requires = new ListBuffer<>();
 971         for (RequiresDirective r: m.requires) {
 972             if (!r.flags.contains(RequiresFlag.EXTRA))
 973                 requires.add(r);
 974         }
 975         databuf.appendChar(requires.size());
 976         for (RequiresDirective r: requires) {
 977             databuf.appendChar(pool.put(r.module));
 978             databuf.appendChar(RequiresFlag.value(r.flags));
 979             databuf.appendChar(r.module.version != null ? pool.put(r.module.version) : 0);
 980         }
 981 
 982         List<ExportsDirective> exports = m.exports;
 983         databuf.appendChar(exports.size());
 984         for (ExportsDirective e: exports) {
 985             databuf.appendChar(pool.put(e.packge));
 986             databuf.appendChar(ExportsFlag.value(e.flags));
 987             if (e.modules == null) {
 988                 databuf.appendChar(0);
 989             } else {
 990                 databuf.appendChar(e.modules.size());
 991                 for (ModuleSymbol msym: e.modules) {
 992                     databuf.appendChar(pool.put(msym));
 993                 }
 994             }
 995         }
 996 
 997         List<OpensDirective> opens = m.opens;
 998         databuf.appendChar(opens.size());
 999         for (OpensDirective o: opens) {
1000             databuf.appendChar(pool.put(o.packge));
1001             databuf.appendChar(OpensFlag.value(o.flags));
1002             if (o.modules == null) {
1003                 databuf.appendChar(0);
1004             } else {
1005                 databuf.appendChar(o.modules.size());
1006                 for (ModuleSymbol msym: o.modules) {
1007                     databuf.appendChar(pool.put(msym));
1008                 }
1009             }
1010         }
1011 
1012         List<UsesDirective> uses = m.uses;
1013         databuf.appendChar(uses.size());
1014         for (UsesDirective s: uses) {
1015             databuf.appendChar(pool.put(s.service));
1016         }
1017 
1018         // temporary fix to merge repeated provides clause for same service;
1019         // eventually this should be disallowed when analyzing the module,
1020         // so that each service type only appears once.
1021         Map<ClassSymbol, Set<ClassSymbol>> mergedProvides = new LinkedHashMap<>();
1022         for (ProvidesDirective p : m.provides) {
1023             mergedProvides.computeIfAbsent(p.service, s -> new LinkedHashSet<>()).addAll(p.impls);
1024         }
1025         databuf.appendChar(mergedProvides.size());
1026         mergedProvides.forEach((srvc, impls) -> {
1027             databuf.appendChar(pool.put(srvc));
1028             databuf.appendChar(impls.size());
1029             impls.forEach(impl -> databuf.appendChar(pool.put(impl)));
1030         });
1031 
1032         endAttr(alenIdx);
1033         return 1;
1034     }
1035 
1036 
1037 /**********************************************************************
1038  * Writing Objects
1039  **********************************************************************/
1040 
1041     /** Enter an inner class into the `innerClasses' set/queue.
1042      */
1043     void enterInner(ClassSymbol c) {
1044         if (c.type.isCompound()) {
1045             throw new AssertionError("Unexpected intersection type: " + c.type);
1046         }
1047         try {
1048             c.complete();
1049         } catch (CompletionFailure ex) {
1050             System.err.println("error: " + c + ": " + ex.getMessage());
1051             throw ex;
1052         }
1053         if (!c.type.hasTag(CLASS)) return; // arrays
1054         if (pool != null && // pool might be null if called from xClassName
1055             c.owner.enclClass() != null &&
1056             (innerClasses == null || !innerClasses.contains(c))) {
1057 //          log.errWriter.println("enter inner " + c);//DEBUG
1058             enterInner(c.owner.enclClass());
1059             pool.put(c);
1060             if (c.name != names.empty)
1061                 pool.put(c.name);
1062             if (innerClasses == null) {
1063                 innerClasses = new HashSet<>();
1064                 innerClassesQueue = new ListBuffer<>();
1065                 pool.put(names.InnerClasses);
1066             }
1067             innerClasses.add(c);
1068             innerClassesQueue.append(c);
1069         }
1070     }
1071 
1072     /** Write "inner classes" attribute.
1073      */
1074     void writeInnerClasses() {
1075         int alenIdx = writeAttr(names.InnerClasses);
1076         databuf.appendChar(innerClassesQueue.length());
1077         for (List<ClassSymbol> l = innerClassesQueue.toList();
1078              l.nonEmpty();
1079              l = l.tail) {
1080             ClassSymbol inner = l.head;
1081             inner.markAbstractIfNeeded(types);
1082             char flags = (char) adjustFlags(inner.flags_field);
1083             if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
1084             flags &= ~STRICTFP; //inner classes should not have the strictfp flag set.
1085             if (dumpInnerClassModifiers) {
1086                 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1087                 pw.println("INNERCLASS  " + inner.name);
1088                 pw.println("---" + flagNames(flags));
1089             }
1090             databuf.appendChar(pool.get(inner));
1091             databuf.appendChar(
1092                 inner.owner.kind == TYP && !inner.name.isEmpty() ? pool.get(inner.owner) : 0);
1093             databuf.appendChar(
1094                 !inner.name.isEmpty() ? pool.get(inner.name) : 0);
1095             databuf.appendChar(flags);
1096         }
1097         endAttr(alenIdx);
1098     }
1099 
1100     /**
1101      * Write NestMembers attribute (if needed)
1102      */
1103     int writeNestMembersIfNeeded(ClassSymbol csym) {
1104         ListBuffer<Symbol> nested = new ListBuffer<>();
1105         listNested(csym, nested);
1106         Set<Symbol> nestedUnique = new HashSet<>(nested);
1107         if (csym.owner.kind == PCK && !nestedUnique.isEmpty()) {
1108             int alenIdx = writeAttr(names.NestMembers);
1109             databuf.appendChar(nestedUnique.size());
1110             for (Symbol s : nestedUnique) {
1111                 databuf.appendChar(pool.put(s));
1112             }
1113             endAttr(alenIdx);
1114             return 1;
1115         }
1116         return 0;
1117     }
1118 
1119     /**
1120      * Write MemberOfNest attribute (if needed)
1121      */
1122     int writeMemberOfNestIfNeeded(ClassSymbol csym) {
1123         if (csym.owner.kind != PCK) {
1124             int alenIdx = writeAttr(names.MemberOfNest);
1125             databuf.appendChar(pool.put(csym.outermostClass()));
1126             endAttr(alenIdx);
1127             return 1;
1128         }
1129         return 0;
1130     }
1131 
1132     private void listNested(Symbol sym, ListBuffer<Symbol> seen) {
1133         if (sym.kind != TYP) return;
1134         ClassSymbol csym = (ClassSymbol)sym;
1135         if (csym.owner.kind != PCK) {
1136             seen.add(csym);
1137         }
1138         if (csym.members() != null) {
1139             for (Symbol s : sym.members().getSymbols()) {
1140                 listNested(s, seen);
1141             }
1142         }
1143         if (csym.trans_local != null) {
1144             for (Symbol s : csym.trans_local) {
1145                 listNested(s, seen);
1146             }
1147         }
1148     }
1149 
1150     /** Write "bootstrapMethods" attribute.
1151      */
1152     void writeBootstrapMethods() {
1153         int alenIdx = writeAttr(names.BootstrapMethods);
1154         databuf.appendChar(bootstrapMethods.size());
1155         for (Map.Entry<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> entry : bootstrapMethods.entrySet()) {
1156             DynamicMethod.BootstrapMethodsKey bsmKey = entry.getKey();
1157             //write BSM handle
1158             databuf.appendChar(pool.get(entry.getValue().mh));
1159             Object[] uniqueArgs = bsmKey.getUniqueArgs();
1160             //write static args length
1161             databuf.appendChar(uniqueArgs.length);
1162             //write static args array
1163             for (Object o : uniqueArgs) {
1164                 databuf.appendChar(pool.get(o));
1165             }
1166         }
1167         endAttr(alenIdx);
1168     }
1169 
1170     /** Write field symbol, entering all references into constant pool.
1171      */
1172     void writeField(VarSymbol v) {
1173         int flags = adjustFlags(v.flags());
1174         databuf.appendChar(flags);
1175         if (dumpFieldModifiers) {
1176             PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1177             pw.println("FIELD  " + v.name);
1178             pw.println("---" + flagNames(v.flags()));
1179         }
1180         databuf.appendChar(pool.put(v.name));
1181         databuf.appendChar(pool.put(typeSig(v.erasure(types))));
1182         int acountIdx = beginAttrs();
1183         int acount = 0;
1184         if (v.getConstValue() != null) {
1185             int alenIdx = writeAttr(names.ConstantValue);
1186             databuf.appendChar(pool.put(v.getConstValue()));
1187             endAttr(alenIdx);
1188             acount++;
1189         }
1190         acount += writeMemberAttrs(v);
1191         endAttrs(acountIdx, acount);
1192     }
1193 
1194     /** Write method symbol, entering all references into constant pool.
1195      */
1196     void writeMethod(MethodSymbol m) {
1197         int flags = adjustFlags(m.flags());
1198         databuf.appendChar(flags);
1199         if (dumpMethodModifiers) {
1200             PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1201             pw.println("METHOD  " + m.name);
1202             pw.println("---" + flagNames(m.flags()));
1203         }
1204         databuf.appendChar(pool.put(m.name));
1205         databuf.appendChar(pool.put(typeSig(m.externalType(types))));
1206         int acountIdx = beginAttrs();
1207         int acount = 0;
1208         if (m.code != null) {
1209             int alenIdx = writeAttr(names.Code);
1210             writeCode(m.code);
1211             m.code = null; // to conserve space
1212             endAttr(alenIdx);
1213             acount++;
1214         }
1215         List<Type> thrown = m.erasure(types).getThrownTypes();
1216         if (thrown.nonEmpty()) {
1217             int alenIdx = writeAttr(names.Exceptions);
1218             databuf.appendChar(thrown.length());
1219             for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1220                 databuf.appendChar(pool.put(l.head.tsym));
1221             endAttr(alenIdx);
1222             acount++;
1223         }
1224         if (m.defaultValue != null) {
1225             int alenIdx = writeAttr(names.AnnotationDefault);
1226             m.defaultValue.accept(awriter);
1227             endAttr(alenIdx);
1228             acount++;
1229         }
1230         if (options.isSet(PARAMETERS)) {
1231             if (!m.isLambdaMethod()) // Per JDK-8138729, do not emit parameters table for lambda bodies.
1232                 acount += writeMethodParametersAttr(m);
1233         }
1234         acount += writeMemberAttrs(m);
1235         if (!m.isLambdaMethod())
1236             acount += writeParameterAttrs(m);
1237         endAttrs(acountIdx, acount);
1238     }
1239 
1240     /** Write code attribute of method.
1241      */
1242     void writeCode(Code code) {
1243         databuf.appendChar(code.max_stack);
1244         databuf.appendChar(code.max_locals);
1245         databuf.appendInt(code.cp);
1246         databuf.appendBytes(code.code, 0, code.cp);
1247         databuf.appendChar(code.catchInfo.length());
1248         for (List<char[]> l = code.catchInfo.toList();
1249              l.nonEmpty();
1250              l = l.tail) {
1251             for (int i = 0; i < l.head.length; i++)
1252                 databuf.appendChar(l.head[i]);
1253         }
1254         int acountIdx = beginAttrs();
1255         int acount = 0;
1256 
1257         if (code.lineInfo.nonEmpty()) {
1258             int alenIdx = writeAttr(names.LineNumberTable);
1259             databuf.appendChar(code.lineInfo.length());
1260             for (List<char[]> l = code.lineInfo.reverse();
1261                  l.nonEmpty();
1262                  l = l.tail)
1263                 for (int i = 0; i < l.head.length; i++)
1264                     databuf.appendChar(l.head[i]);
1265             endAttr(alenIdx);
1266             acount++;
1267         }
1268 
1269         if (genCrt && (code.crt != null)) {
1270             CRTable crt = code.crt;
1271             int alenIdx = writeAttr(names.CharacterRangeTable);
1272             int crtIdx = beginAttrs();
1273             int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1274             endAttrs(crtIdx, crtEntries);
1275             endAttr(alenIdx);
1276             acount++;
1277         }
1278 
1279         // counter for number of generic local variables
1280         if (code.varDebugInfo && code.varBufferSize > 0) {
1281             int nGenericVars = 0;
1282             int alenIdx = writeAttr(names.LocalVariableTable);
1283             databuf.appendChar(code.getLVTSize());
1284             for (int i=0; i<code.varBufferSize; i++) {
1285                 Code.LocalVar var = code.varBuffer[i];
1286 
1287                 for (Code.LocalVar.Range r: var.aliveRanges) {
1288                     // write variable info
1289                     Assert.check(r.start_pc >= 0
1290                             && r.start_pc <= code.cp);
1291                     databuf.appendChar(r.start_pc);
1292                     Assert.check(r.length > 0
1293                             && (r.start_pc + r.length) <= code.cp);
1294                     databuf.appendChar(r.length);
1295                     VarSymbol sym = var.sym;
1296                     databuf.appendChar(pool.put(sym.name));
1297                     Type vartype = sym.erasure(types);
1298                     databuf.appendChar(pool.put(typeSig(vartype)));
1299                     databuf.appendChar(var.reg);
1300                     if (needsLocalVariableTypeEntry(var.sym.type)) {
1301                         nGenericVars++;
1302                     }
1303                 }
1304             }
1305             endAttr(alenIdx);
1306             acount++;
1307 
1308             if (nGenericVars > 0) {
1309                 alenIdx = writeAttr(names.LocalVariableTypeTable);
1310                 databuf.appendChar(nGenericVars);
1311                 int count = 0;
1312 
1313                 for (int i=0; i<code.varBufferSize; i++) {
1314                     Code.LocalVar var = code.varBuffer[i];
1315                     VarSymbol sym = var.sym;
1316                     if (!needsLocalVariableTypeEntry(sym.type))
1317                         continue;
1318                     for (Code.LocalVar.Range r : var.aliveRanges) {
1319                         // write variable info
1320                         databuf.appendChar(r.start_pc);
1321                         databuf.appendChar(r.length);
1322                         databuf.appendChar(pool.put(sym.name));
1323                         databuf.appendChar(pool.put(typeSig(sym.type)));
1324                         databuf.appendChar(var.reg);
1325                         count++;
1326                     }
1327                 }
1328                 Assert.check(count == nGenericVars);
1329                 endAttr(alenIdx);
1330                 acount++;
1331             }
1332         }
1333 
1334         if (code.stackMapBufferSize > 0) {
1335             if (debugstackmap) System.out.println("Stack map for " + code.meth);
1336             int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1337             writeStackMap(code);
1338             endAttr(alenIdx);
1339             acount++;
1340         }
1341 
1342         acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true);
1343 
1344         endAttrs(acountIdx, acount);
1345     }
1346     //where
1347     private boolean needsLocalVariableTypeEntry(Type t) {
1348         //a local variable needs a type-entry if its type T is generic
1349         //(i.e. |T| != T) and if it's not an intersection type (not supported
1350         //in signature attribute grammar)
1351         return (!types.isSameType(t, types.erasure(t)) &&
1352                 !t.isCompound());
1353     }
1354 
1355     void writeStackMap(Code code) {
1356         int nframes = code.stackMapBufferSize;
1357         if (debugstackmap) System.out.println(" nframes = " + nframes);
1358         databuf.appendChar(nframes);
1359 
1360         switch (code.stackMap) {
1361         case CLDC:
1362             for (int i=0; i<nframes; i++) {
1363                 if (debugstackmap) System.out.print("  " + i + ":");
1364                 Code.StackMapFrame frame = code.stackMapBuffer[i];
1365 
1366                 // output PC
1367                 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1368                 databuf.appendChar(frame.pc);
1369 
1370                 // output locals
1371                 int localCount = 0;
1372                 for (int j=0; j<frame.locals.length;
1373                      j += Code.width(frame.locals[j])) {
1374                     localCount++;
1375                 }
1376                 if (debugstackmap) System.out.print(" nlocals=" +
1377                                                     localCount);
1378                 databuf.appendChar(localCount);
1379                 for (int j=0; j<frame.locals.length;
1380                      j += Code.width(frame.locals[j])) {
1381                     if (debugstackmap) System.out.print(" local[" + j + "]=");
1382                     writeStackMapType(frame.locals[j]);
1383                 }
1384 
1385                 // output stack
1386                 int stackCount = 0;
1387                 for (int j=0; j<frame.stack.length;
1388                      j += Code.width(frame.stack[j])) {
1389                     stackCount++;
1390                 }
1391                 if (debugstackmap) System.out.print(" nstack=" +
1392                                                     stackCount);
1393                 databuf.appendChar(stackCount);
1394                 for (int j=0; j<frame.stack.length;
1395                      j += Code.width(frame.stack[j])) {
1396                     if (debugstackmap) System.out.print(" stack[" + j + "]=");
1397                     writeStackMapType(frame.stack[j]);
1398                 }
1399                 if (debugstackmap) System.out.println();
1400             }
1401             break;
1402         case JSR202: {
1403             Assert.checkNull(code.stackMapBuffer);
1404             for (int i=0; i<nframes; i++) {
1405                 if (debugstackmap) System.out.print("  " + i + ":");
1406                 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1407                 frame.write(this);
1408                 if (debugstackmap) System.out.println();
1409             }
1410             break;
1411         }
1412         default:
1413             throw new AssertionError("Unexpected stackmap format value");
1414         }
1415     }
1416 
1417         //where
1418         void writeStackMapType(Type t) {
1419             if (t == null) {
1420                 if (debugstackmap) System.out.print("empty");
1421                 databuf.appendByte(0);
1422             }
1423             else switch(t.getTag()) {
1424             case BYTE:
1425             case CHAR:
1426             case SHORT:
1427             case INT:
1428             case BOOLEAN:
1429                 if (debugstackmap) System.out.print("int");
1430                 databuf.appendByte(1);
1431                 break;
1432             case FLOAT:
1433                 if (debugstackmap) System.out.print("float");
1434                 databuf.appendByte(2);
1435                 break;
1436             case DOUBLE:
1437                 if (debugstackmap) System.out.print("double");
1438                 databuf.appendByte(3);
1439                 break;
1440             case LONG:
1441                 if (debugstackmap) System.out.print("long");
1442                 databuf.appendByte(4);
1443                 break;
1444             case BOT: // null
1445                 if (debugstackmap) System.out.print("null");
1446                 databuf.appendByte(5);
1447                 break;
1448             case CLASS:
1449             case ARRAY:
1450                 if (debugstackmap) System.out.print("object(" + t + ")");
1451                 databuf.appendByte(7);
1452                 databuf.appendChar(pool.put(t));
1453                 break;
1454             case TYPEVAR:
1455                 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1456                 databuf.appendByte(7);
1457                 databuf.appendChar(pool.put(types.erasure(t).tsym));
1458                 break;
1459             case UNINITIALIZED_THIS:
1460                 if (debugstackmap) System.out.print("uninit_this");
1461                 databuf.appendByte(6);
1462                 break;
1463             case UNINITIALIZED_OBJECT:
1464                 { UninitializedType uninitType = (UninitializedType)t;
1465                 databuf.appendByte(8);
1466                 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1467                 databuf.appendChar(uninitType.offset);
1468                 }
1469                 break;
1470             default:
1471                 throw new AssertionError();
1472             }
1473         }
1474 
1475     /** An entry in the JSR202 StackMapTable */
1476     abstract static class StackMapTableFrame {
1477         abstract int getFrameType();
1478 
1479         void write(ClassWriter writer) {
1480             int frameType = getFrameType();
1481             writer.databuf.appendByte(frameType);
1482             if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1483         }
1484 
1485         static class SameFrame extends StackMapTableFrame {
1486             final int offsetDelta;
1487             SameFrame(int offsetDelta) {
1488                 this.offsetDelta = offsetDelta;
1489             }
1490             int getFrameType() {
1491                 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1492             }
1493             @Override
1494             void write(ClassWriter writer) {
1495                 super.write(writer);
1496                 if (getFrameType() == SAME_FRAME_EXTENDED) {
1497                     writer.databuf.appendChar(offsetDelta);
1498                     if (writer.debugstackmap){
1499                         System.out.print(" offset_delta=" + offsetDelta);
1500                     }
1501                 }
1502             }
1503         }
1504 
1505         static class SameLocals1StackItemFrame extends StackMapTableFrame {
1506             final int offsetDelta;
1507             final Type stack;
1508             SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1509                 this.offsetDelta = offsetDelta;
1510                 this.stack = stack;
1511             }
1512             int getFrameType() {
1513                 return (offsetDelta < SAME_FRAME_SIZE) ?
1514                        (SAME_FRAME_SIZE + offsetDelta) :
1515                        SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1516             }
1517             @Override
1518             void write(ClassWriter writer) {
1519                 super.write(writer);
1520                 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1521                     writer.databuf.appendChar(offsetDelta);
1522                     if (writer.debugstackmap) {
1523                         System.out.print(" offset_delta=" + offsetDelta);
1524                     }
1525                 }
1526                 if (writer.debugstackmap) {
1527                     System.out.print(" stack[" + 0 + "]=");
1528                 }
1529                 writer.writeStackMapType(stack);
1530             }
1531         }
1532 
1533         static class ChopFrame extends StackMapTableFrame {
1534             final int frameType;
1535             final int offsetDelta;
1536             ChopFrame(int frameType, int offsetDelta) {
1537                 this.frameType = frameType;
1538                 this.offsetDelta = offsetDelta;
1539             }
1540             int getFrameType() { return frameType; }
1541             @Override
1542             void write(ClassWriter writer) {
1543                 super.write(writer);
1544                 writer.databuf.appendChar(offsetDelta);
1545                 if (writer.debugstackmap) {
1546                     System.out.print(" offset_delta=" + offsetDelta);
1547                 }
1548             }
1549         }
1550 
1551         static class AppendFrame extends StackMapTableFrame {
1552             final int frameType;
1553             final int offsetDelta;
1554             final Type[] locals;
1555             AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1556                 this.frameType = frameType;
1557                 this.offsetDelta = offsetDelta;
1558                 this.locals = locals;
1559             }
1560             int getFrameType() { return frameType; }
1561             @Override
1562             void write(ClassWriter writer) {
1563                 super.write(writer);
1564                 writer.databuf.appendChar(offsetDelta);
1565                 if (writer.debugstackmap) {
1566                     System.out.print(" offset_delta=" + offsetDelta);
1567                 }
1568                 for (int i=0; i<locals.length; i++) {
1569                      if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1570                      writer.writeStackMapType(locals[i]);
1571                 }
1572             }
1573         }
1574 
1575         static class FullFrame extends StackMapTableFrame {
1576             final int offsetDelta;
1577             final Type[] locals;
1578             final Type[] stack;
1579             FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1580                 this.offsetDelta = offsetDelta;
1581                 this.locals = locals;
1582                 this.stack = stack;
1583             }
1584             int getFrameType() { return FULL_FRAME; }
1585             @Override
1586             void write(ClassWriter writer) {
1587                 super.write(writer);
1588                 writer.databuf.appendChar(offsetDelta);
1589                 writer.databuf.appendChar(locals.length);
1590                 if (writer.debugstackmap) {
1591                     System.out.print(" offset_delta=" + offsetDelta);
1592                     System.out.print(" nlocals=" + locals.length);
1593                 }
1594                 for (int i=0; i<locals.length; i++) {
1595                     if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1596                     writer.writeStackMapType(locals[i]);
1597                 }
1598 
1599                 writer.databuf.appendChar(stack.length);
1600                 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1601                 for (int i=0; i<stack.length; i++) {
1602                     if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1603                     writer.writeStackMapType(stack[i]);
1604                 }
1605             }
1606         }
1607 
1608        /** Compare this frame with the previous frame and produce
1609         *  an entry of compressed stack map frame. */
1610         static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1611                                               int prev_pc,
1612                                               Type[] prev_locals,
1613                                               Types types) {
1614             Type[] locals = this_frame.locals;
1615             Type[] stack = this_frame.stack;
1616             int offset_delta = this_frame.pc - prev_pc - 1;
1617             if (stack.length == 1) {
1618                 if (locals.length == prev_locals.length
1619                     && compare(prev_locals, locals, types) == 0) {
1620                     return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1621                 }
1622             } else if (stack.length == 0) {
1623                 int diff_length = compare(prev_locals, locals, types);
1624                 if (diff_length == 0) {
1625                     return new SameFrame(offset_delta);
1626                 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1627                     // APPEND
1628                     Type[] local_diff = new Type[-diff_length];
1629                     for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1630                         local_diff[j] = locals[i];
1631                     }
1632                     return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1633                                            offset_delta,
1634                                            local_diff);
1635                 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1636                     // CHOP
1637                     return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1638                                          offset_delta);
1639                 }
1640             }
1641             // FULL_FRAME
1642             return new FullFrame(offset_delta, locals, stack);
1643         }
1644 
1645         static boolean isInt(Type t) {
1646             return (t.getTag().isStrictSubRangeOf(INT)  || t.hasTag(BOOLEAN));
1647         }
1648 
1649         static boolean isSameType(Type t1, Type t2, Types types) {
1650             if (t1 == null) { return t2 == null; }
1651             if (t2 == null) { return false; }
1652 
1653             if (isInt(t1) && isInt(t2)) { return true; }
1654 
1655             if (t1.hasTag(UNINITIALIZED_THIS)) {
1656                 return t2.hasTag(UNINITIALIZED_THIS);
1657             } else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
1658                 if (t2.hasTag(UNINITIALIZED_OBJECT)) {
1659                     return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1660                 } else {
1661                     return false;
1662                 }
1663             } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
1664                 return false;
1665             }
1666 
1667             return types.isSameType(t1, t2);
1668         }
1669 
1670         static int compare(Type[] arr1, Type[] arr2, Types types) {
1671             int diff_length = arr1.length - arr2.length;
1672             if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1673                 return Integer.MAX_VALUE;
1674             }
1675             int len = (diff_length > 0) ? arr2.length : arr1.length;
1676             for (int i=0; i<len; i++) {
1677                 if (!isSameType(arr1[i], arr2[i], types)) {
1678                     return Integer.MAX_VALUE;
1679                 }
1680             }
1681             return diff_length;
1682         }
1683     }
1684 
1685     void writeFields(Scope s) {
1686         // process them in reverse sibling order;
1687         // i.e., process them in declaration order.
1688         List<VarSymbol> vars = List.nil();
1689         for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1690             if (sym.kind == VAR) vars = vars.prepend((VarSymbol)sym);
1691         }
1692         while (vars.nonEmpty()) {
1693             writeField(vars.head);
1694             vars = vars.tail;
1695         }
1696     }
1697 
1698     void writeMethods(Scope s) {
1699         List<MethodSymbol> methods = List.nil();
1700         for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1701             if (sym.kind == MTH && (sym.flags() & HYPOTHETICAL) == 0)
1702                 methods = methods.prepend((MethodSymbol)sym);
1703         }
1704         while (methods.nonEmpty()) {
1705             writeMethod(methods.head);
1706             methods = methods.tail;
1707         }
1708     }
1709 
1710     /** Emit a class file for a given class.
1711      *  @param c      The class from which a class file is generated.
1712      */
1713     public JavaFileObject writeClass(ClassSymbol c)
1714         throws IOException, PoolOverflow, StringOverflow
1715     {
1716         String name = (c.owner.kind == MDL ? c.name : c.flatname).toString();
1717         Location outLocn;
1718         if (multiModuleMode) {
1719             ModuleSymbol msym = c.owner.kind == MDL ? (ModuleSymbol) c.owner : c.packge().modle;
1720             outLocn = fileManager.getLocationForModule(CLASS_OUTPUT, msym.name.toString());
1721         } else {
1722             outLocn = CLASS_OUTPUT;
1723         }
1724         JavaFileObject outFile
1725             = fileManager.getJavaFileForOutput(outLocn,
1726                                                name,
1727                                                JavaFileObject.Kind.CLASS,
1728                                                c.sourcefile);
1729         OutputStream out = outFile.openOutputStream();
1730         try {
1731             writeClassFile(out, c);
1732             if (verbose)
1733                 log.printVerbose("wrote.file", outFile);
1734             out.close();
1735             out = null;
1736         } finally {
1737             if (out != null) {
1738                 // if we are propagating an exception, delete the file
1739                 out.close();
1740                 outFile.delete();
1741                 outFile = null;
1742             }
1743         }
1744         return outFile; // may be null if write failed
1745     }
1746 
1747     /** Write class `c' to outstream `out'.
1748      */
1749     public void writeClassFile(OutputStream out, ClassSymbol c)
1750         throws IOException, PoolOverflow, StringOverflow {
1751         Assert.check((c.flags() & COMPOUND) == 0);
1752         databuf.reset();
1753         poolbuf.reset();
1754         signatureGen.reset();
1755         pool = c.pool;
1756         innerClasses = null;
1757         innerClassesQueue = null;
1758         bootstrapMethods = new LinkedHashMap<>();
1759 
1760         Type supertype = types.supertype(c.type);
1761         List<Type> interfaces = types.interfaces(c.type);
1762         List<Type> typarams = c.type.getTypeArguments();
1763 
1764         int flags;
1765         if (c.owner.kind == MDL) {
1766             flags = ACC_MODULE;
1767         } else {
1768             flags = adjustFlags(c.flags() & ~DEFAULT);
1769             if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1770             flags = flags & ClassFlags & ~STRICTFP;
1771             if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
1772         }
1773 
1774         if (dumpClassModifiers) {
1775             PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1776             pw.println();
1777             pw.println("CLASSFILE  " + c.getQualifiedName());
1778             pw.println("---" + flagNames(flags));
1779         }
1780         databuf.appendChar(flags);
1781 
1782         if (c.owner.kind == MDL) {
1783             PackageSymbol unnamed = ((ModuleSymbol) c.owner).unnamedPackage;
1784             databuf.appendChar(pool.put(new ClassSymbol(0, names.module_info, unnamed)));
1785         } else {
1786             databuf.appendChar(pool.put(c));
1787         }
1788         databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0);
1789         databuf.appendChar(interfaces.length());
1790         for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1791             databuf.appendChar(pool.put(l.head.tsym));
1792         int fieldsCount = 0;
1793         int methodsCount = 0;
1794         for (Symbol sym : c.members().getSymbols(NON_RECURSIVE)) {
1795             switch (sym.kind) {
1796             case VAR: fieldsCount++; break;
1797             case MTH: if ((sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1798                       break;
1799             case TYP: enterInner((ClassSymbol)sym); break;
1800             default : Assert.error();
1801             }
1802         }
1803 
1804         if (c.trans_local != null) {
1805             for (ClassSymbol local : c.trans_local) {
1806                 enterInner(local);
1807             }
1808         }
1809 
1810         databuf.appendChar(fieldsCount);
1811         writeFields(c.members());
1812         databuf.appendChar(methodsCount);
1813         writeMethods(c.members());
1814 
1815         int acountIdx = beginAttrs();
1816         int acount = 0;
1817 
1818         boolean sigReq =
1819             typarams.length() != 0 || supertype.allparams().length() != 0;
1820         for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1821             sigReq = l.head.allparams().length() != 0;
1822         if (sigReq) {
1823             int alenIdx = writeAttr(names.Signature);
1824             if (typarams.length() != 0) signatureGen.assembleParamsSig(typarams);
1825             signatureGen.assembleSig(supertype);
1826             for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1827                 signatureGen.assembleSig(l.head);
1828             databuf.appendChar(pool.put(signatureGen.toName()));
1829             signatureGen.reset();
1830             endAttr(alenIdx);
1831             acount++;
1832         }
1833 
1834         if (c.sourcefile != null && emitSourceFile) {
1835             int alenIdx = writeAttr(names.SourceFile);
1836             // WHM 6/29/1999: Strip file path prefix.  We do it here at
1837             // the last possible moment because the sourcefile may be used
1838             // elsewhere in error diagnostics. Fixes 4241573.
1839             //databuf.appendChar(c.pool.put(c.sourcefile));
1840             String simpleName = PathFileObject.getSimpleName(c.sourcefile);
1841             databuf.appendChar(c.pool.put(names.fromString(simpleName)));
1842             endAttr(alenIdx);
1843             acount++;
1844         }
1845 
1846         if (genCrt) {
1847             // Append SourceID attribute
1848             int alenIdx = writeAttr(names.SourceID);
1849             databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1850             endAttr(alenIdx);
1851             acount++;
1852             // Append CompilationID attribute
1853             alenIdx = writeAttr(names.CompilationID);
1854             databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis()))));
1855             endAttr(alenIdx);
1856             acount++;
1857         }
1858 
1859         acount += writeFlagAttrs(c.flags());
1860         acount += writeJavaAnnotations(c.getRawAttributes());
1861         acount += writeTypeAnnotations(c.getRawTypeAttributes(), false);
1862         acount += writeEnclosingMethodAttribute(c);
1863         if (c.owner.kind == MDL) {
1864             acount += writeModuleAttribute(c);
1865             acount += writeFlagAttrs(c.owner.flags() & ~DEPRECATED);
1866         }
1867         acount += writeExtraClassAttributes(c);
1868 
1869         poolbuf.appendInt(JAVA_MAGIC);
1870 
1871         if (c.owner.kind == MDL) {
1872             // temporarily overide to force use of v53 for module-info.class
1873             poolbuf.appendChar(0);
1874             poolbuf.appendChar(53);
1875         } else {
1876             poolbuf.appendChar(target.minorVersion);
1877             poolbuf.appendChar(target.majorVersion);
1878 
1879             // TODO: Need to skip this for Modules - not sure where
1880             // that check really belongs, but this works.
1881             if (target.hasNestmateAccess()) {
1882                 acount += writeNestMembersIfNeeded(c);
1883                 acount += writeMemberOfNestIfNeeded(c);
1884             }
1885         }
1886 
1887         writePool(c.pool);
1888 
1889         if (innerClasses != null) {
1890             writeInnerClasses();
1891             acount++;
1892         }
1893 
1894         if (!bootstrapMethods.isEmpty()) {
1895             writeBootstrapMethods();
1896             acount++;
1897         }
1898 
1899         endAttrs(acountIdx, acount);
1900 
1901         poolbuf.appendBytes(databuf.elems, 0, databuf.length);
1902         out.write(poolbuf.elems, 0, poolbuf.length);
1903 
1904         pool = c.pool = null; // to conserve space
1905      }
1906 
1907     /**Allows subclasses to write additional class attributes
1908      *
1909      * @return the number of attributes written
1910      */
1911     protected int writeExtraClassAttributes(ClassSymbol c) {
1912         return 0;
1913     }
1914 
1915     int adjustFlags(final long flags) {
1916         int result = (int)flags;
1917 
1918         if ((flags & BRIDGE) != 0)
1919             result |= ACC_BRIDGE;
1920         if ((flags & VARARGS) != 0)
1921             result |= ACC_VARARGS;
1922         if ((flags & DEFAULT) != 0)
1923             result &= ~ABSTRACT;
1924         return result;
1925     }
1926 
1927     long getLastModified(FileObject filename) {
1928         long mod = 0;
1929         try {
1930             mod = filename.getLastModified();
1931         } catch (SecurityException e) {
1932             throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage());
1933         }
1934         return mod;
1935     }
1936 }