1 /*
   2  * Copyright 1999-2009 Sun Microsystems, Inc.  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.  Sun designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  22  * CA 95054 USA or visit www.sun.com if you need additional information or
  23  * have any questions.
  24  */
  25 
  26 package com.sun.tools.javac.jvm;
  27 
  28 import java.io.*;
  29 import java.net.URI;
  30 import java.net.URISyntaxException;
  31 import java.nio.CharBuffer;
  32 import java.util.Arrays;
  33 import java.util.EnumSet;
  34 import java.util.HashMap;
  35 import java.util.Map;
  36 import java.util.Set;
  37 import javax.lang.model.SourceVersion;
  38 import javax.tools.JavaFileObject;
  39 import javax.tools.JavaFileManager;
  40 import javax.tools.JavaFileManager.Location;
  41 import javax.tools.StandardJavaFileManager;
  42 
  43 import static javax.tools.StandardLocation.*;
  44 
  45 import com.sun.tools.javac.comp.Annotate;
  46 import com.sun.tools.javac.code.*;
  47 import com.sun.tools.javac.code.Type.*;
  48 import com.sun.tools.javac.code.Symbol.*;
  49 import com.sun.tools.javac.code.Symtab;
  50 import com.sun.tools.javac.file.BaseFileObject;
  51 import com.sun.tools.javac.util.*;
  52 
  53 import static com.sun.tools.javac.code.Flags.*;
  54 import static com.sun.tools.javac.code.Kinds.*;
  55 import static com.sun.tools.javac.code.TypeTags.*;
  56 import static com.sun.tools.javac.jvm.ClassFile.*;
  57 import static com.sun.tools.javac.jvm.ClassFile.Version.*;
  58 
  59 /** This class provides operations to read a classfile into an internal
  60  *  representation. The internal representation is anchored in a
  61  *  ClassSymbol which contains in its scope symbol representations
  62  *  for all other definitions in the classfile. Top-level Classes themselves
  63  *  appear as members of the scopes of PackageSymbols.
  64  *
  65  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If
  66  *  you write code that depends on this, you do so at your own risk.
  67  *  This code and its internal interfaces are subject to change or
  68  *  deletion without notice.</b>
  69  */
  70 public class ClassReader implements Completer {
  71     /** The context key for the class reader. */
  72     protected static final Context.Key<ClassReader> classReaderKey =
  73         new Context.Key<ClassReader>();
  74 
  75     Annotate annotate;
  76 
  77     /** Switch: verbose output.
  78      */
  79     boolean verbose;
  80 
  81     /** Switch: check class file for correct minor version, unrecognized
  82      *  attributes.
  83      */
  84     boolean checkClassFile;
  85 
  86     /** Switch: read constant pool and code sections. This switch is initially
  87      *  set to false but can be turned on from outside.
  88      */
  89     public boolean readAllOfClassFile = false;
  90 
  91     /** Switch: read GJ signature information.
  92      */
  93     boolean allowGenerics;
  94 
  95     /** Switch: read varargs attribute.
  96      */
  97     boolean allowVarargs;
  98 
  99     /** Switch: allow annotations.
 100      */
 101     boolean allowAnnotations;
 102 
 103     /** Switch: preserve parameter names from the variable table.
 104      */
 105     public boolean saveParameterNames;
 106 
 107     /**
 108      * Switch: cache completion failures unless -XDdev is used
 109      */
 110     private boolean cacheCompletionFailure;
 111 
 112     /**
 113      * Switch: prefer source files instead of newer when both source
 114      * and class are available
 115      **/
 116     public boolean preferSource;
 117 
 118     /** The log to use for verbose output
 119      */
 120     final Log log;
 121 
 122     /** The symbol table. */
 123     Symtab syms;
 124 
 125     Types types;
 126 
 127     /** The name table. */
 128     final Names names;
 129 
 130     /** Force a completion failure on this name
 131      */
 132     final Name completionFailureName;
 133 
 134     /** Access to files
 135      */
 136     private final JavaFileManager fileManager;
 137 
 138     /** Factory for diagnostics
 139      */
 140     JCDiagnostic.Factory diagFactory;
 141 
 142     /** Can be reassigned from outside:
 143      *  the completer to be used for ".java" files. If this remains unassigned
 144      *  ".java" files will not be loaded.
 145      */
 146     public SourceCompleter sourceCompleter = null;
 147 
 148     /** A hashtable containing the encountered top-level and member classes,
 149      *  indexed by flat names. The table does not contain local classes.
 150      */
 151     private Map<Name,ClassSymbol> classes;
 152 
 153     /** A hashtable containing the encountered packages.
 154      */
 155     private Map<Name, PackageSymbol> packages;
 156 
 157     /** The current scope where type variables are entered.
 158      */
 159     protected Scope typevars;
 160 
 161     /** The path name of the class file currently being read.
 162      */
 163     protected JavaFileObject currentClassFile = null;
 164 
 165     /** The class or method currently being read.
 166      */
 167     protected Symbol currentOwner = null;
 168 
 169     /** The buffer containing the currently read class file.
 170      */
 171     byte[] buf = new byte[0x0fff0];
 172 
 173     /** The current input pointer.
 174      */
 175     int bp;
 176 
 177     /** The objects of the constant pool.
 178      */
 179     Object[] poolObj;
 180 
 181     /** For every constant pool entry, an index into buf where the
 182      *  defining section of the entry is found.
 183      */
 184     int[] poolIdx;
 185 
 186     /** The major version number of the class file being read. */
 187     int majorVersion;
 188     /** The minor version number of the class file being read. */
 189     int minorVersion;
 190 
 191     /** Switch: debug output for JSR 308-related operations.
 192      */
 193     boolean debugJSR308;
 194 
 195     /** A table to hold the constant pool indices for method parameter
 196      * names, as given in LocalVariableTable attributes.
 197      */
 198     int[] parameterNameIndices;
 199 
 200     /**
 201      * Whether or not any parameter names have been found.
 202      */
 203     boolean haveParameterNameIndices;
 204 
 205     /** Get the ClassReader instance for this invocation. */
 206     public static ClassReader instance(Context context) {
 207         ClassReader instance = context.get(classReaderKey);
 208         if (instance == null)
 209             instance = new ClassReader(context, true);
 210         return instance;
 211     }
 212 
 213     /** Initialize classes and packages, treating this as the definitive classreader. */
 214     public void init(Symtab syms) {
 215         init(syms, true);
 216     }
 217 
 218     /** Initialize classes and packages, optionally treating this as
 219      *  the definitive classreader.
 220      */
 221     private void init(Symtab syms, boolean definitive) {
 222         if (classes != null) return;
 223 
 224         if (definitive) {
 225             assert packages == null || packages == syms.packages;
 226             packages = syms.packages;
 227             assert classes == null || classes == syms.classes;
 228             classes = syms.classes;
 229         } else {
 230             packages = new HashMap<Name, PackageSymbol>();
 231             classes = new HashMap<Name, ClassSymbol>();
 232         }
 233 
 234         packages.put(names.empty, syms.rootPackage);
 235         syms.rootPackage.completer = this;
 236         syms.unnamedPackage.completer = this;
 237     }
 238 
 239     /** Construct a new class reader, optionally treated as the
 240      *  definitive classreader for this invocation.
 241      */
 242     protected ClassReader(Context context, boolean definitive) {
 243         if (definitive) context.put(classReaderKey, this);
 244 
 245         names = Names.instance(context);
 246         syms = Symtab.instance(context);
 247         types = Types.instance(context);
 248         fileManager = context.get(JavaFileManager.class);
 249         if (fileManager == null)
 250             throw new AssertionError("FileManager initialization error");
 251         diagFactory = JCDiagnostic.Factory.instance(context);
 252 
 253         init(syms, definitive);
 254         log = Log.instance(context);
 255 
 256         Options options = Options.instance(context);
 257         annotate = Annotate.instance(context);
 258         verbose        = options.get("-verbose")        != null;
 259         checkClassFile = options.get("-checkclassfile") != null;
 260         Source source = Source.instance(context);
 261         allowGenerics    = source.allowGenerics();
 262         allowVarargs     = source.allowVarargs();
 263         allowAnnotations = source.allowAnnotations();
 264         saveParameterNames = options.get("save-parameter-names") != null;
 265         cacheCompletionFailure = options.get("dev") == null;
 266         preferSource = "source".equals(options.get("-Xprefer"));
 267 
 268         completionFailureName =
 269             (options.get("failcomplete") != null)
 270             ? names.fromString(options.get("failcomplete"))
 271             : null;
 272 
 273         typevars = new Scope(syms.noSymbol);
 274         debugJSR308 = options.get("TA:reader") != null;
 275 
 276         initAttributeReaders();
 277     }
 278 
 279     /** Add member to class unless it is synthetic.
 280      */
 281     private void enterMember(ClassSymbol c, Symbol sym) {
 282         if ((sym.flags_field & (SYNTHETIC|BRIDGE)) != SYNTHETIC)
 283             c.members_field.enter(sym);
 284     }
 285 
 286 /************************************************************************
 287  * Error Diagnoses
 288  ***********************************************************************/
 289 
 290 
 291     public class BadClassFile extends CompletionFailure {
 292         private static final long serialVersionUID = 0;
 293 
 294         public BadClassFile(TypeSymbol sym, JavaFileObject file, JCDiagnostic diag) {
 295             super(sym, createBadClassFileDiagnostic(file, diag));
 296         }
 297     }
 298     // where
 299     private JCDiagnostic createBadClassFileDiagnostic(JavaFileObject file, JCDiagnostic diag) {
 300         String key = (file.getKind() == JavaFileObject.Kind.SOURCE
 301                     ? "bad.source.file.header" : "bad.class.file.header");
 302         return diagFactory.fragment(key, file, diag);
 303     }
 304 
 305     public BadClassFile badClassFile(String key, Object... args) {
 306         return new BadClassFile (
 307             currentOwner.enclClass(),
 308             currentClassFile,
 309             diagFactory.fragment(key, args));
 310     }
 311 
 312 /************************************************************************
 313  * Buffer Access
 314  ***********************************************************************/
 315 
 316     /** Read a character.
 317      */
 318     char nextChar() {
 319         return (char)(((buf[bp++] & 0xFF) << 8) + (buf[bp++] & 0xFF));
 320     }
 321 
 322     /** Read a byte.
 323      */
 324     byte nextByte() {
 325         return buf[bp++];
 326     }
 327 
 328     /** Read an integer.
 329      */
 330     int nextInt() {
 331         return
 332             ((buf[bp++] & 0xFF) << 24) +
 333             ((buf[bp++] & 0xFF) << 16) +
 334             ((buf[bp++] & 0xFF) << 8) +
 335             (buf[bp++] & 0xFF);
 336     }
 337 
 338     /** Extract a character at position bp from buf.
 339      */
 340     char getChar(int bp) {
 341         return
 342             (char)(((buf[bp] & 0xFF) << 8) + (buf[bp+1] & 0xFF));
 343     }
 344 
 345     /** Extract an integer at position bp from buf.
 346      */
 347     int getInt(int bp) {
 348         return
 349             ((buf[bp] & 0xFF) << 24) +
 350             ((buf[bp+1] & 0xFF) << 16) +
 351             ((buf[bp+2] & 0xFF) << 8) +
 352             (buf[bp+3] & 0xFF);
 353     }
 354 
 355 
 356     /** Extract a long integer at position bp from buf.
 357      */
 358     long getLong(int bp) {
 359         DataInputStream bufin =
 360             new DataInputStream(new ByteArrayInputStream(buf, bp, 8));
 361         try {
 362             return bufin.readLong();
 363         } catch (IOException e) {
 364             throw new AssertionError(e);
 365         }
 366     }
 367 
 368     /** Extract a float at position bp from buf.
 369      */
 370     float getFloat(int bp) {
 371         DataInputStream bufin =
 372             new DataInputStream(new ByteArrayInputStream(buf, bp, 4));
 373         try {
 374             return bufin.readFloat();
 375         } catch (IOException e) {
 376             throw new AssertionError(e);
 377         }
 378     }
 379 
 380     /** Extract a double at position bp from buf.
 381      */
 382     double getDouble(int bp) {
 383         DataInputStream bufin =
 384             new DataInputStream(new ByteArrayInputStream(buf, bp, 8));
 385         try {
 386             return bufin.readDouble();
 387         } catch (IOException e) {
 388             throw new AssertionError(e);
 389         }
 390     }
 391 
 392 /************************************************************************
 393  * Constant Pool Access
 394  ***********************************************************************/
 395 
 396     /** Index all constant pool entries, writing their start addresses into
 397      *  poolIdx.
 398      */
 399     void indexPool() {
 400         poolIdx = new int[nextChar()];
 401         poolObj = new Object[poolIdx.length];
 402         int i = 1;
 403         while (i < poolIdx.length) {
 404             poolIdx[i++] = bp;
 405             byte tag = buf[bp++];
 406             switch (tag) {
 407             case CONSTANT_Utf8: case CONSTANT_Unicode: {
 408                 int len = nextChar();
 409                 bp = bp + len;
 410                 break;
 411             }
 412             case CONSTANT_Class:
 413             case CONSTANT_String:
 414                 bp = bp + 2;
 415                 break;
 416             case CONSTANT_Fieldref:
 417             case CONSTANT_Methodref:
 418             case CONSTANT_InterfaceMethodref:
 419             case CONSTANT_NameandType:
 420             case CONSTANT_Integer:
 421             case CONSTANT_Float:
 422                 bp = bp + 4;
 423                 break;
 424             case CONSTANT_Long:
 425             case CONSTANT_Double:
 426                 bp = bp + 8;
 427                 i++;
 428                 break;
 429             default:
 430                 throw badClassFile("bad.const.pool.tag.at",
 431                                    Byte.toString(tag),
 432                                    Integer.toString(bp -1));
 433             }
 434         }
 435     }
 436 
 437     /** Read constant pool entry at start address i, use pool as a cache.
 438      */
 439     Object readPool(int i) {
 440         Object result = poolObj[i];
 441         if (result != null) return result;
 442 
 443         int index = poolIdx[i];
 444         if (index == 0) return null;
 445 
 446         byte tag = buf[index];
 447         switch (tag) {
 448         case CONSTANT_Utf8:
 449             poolObj[i] = names.fromUtf(buf, index + 3, getChar(index + 1));
 450             break;
 451         case CONSTANT_Unicode:
 452             throw badClassFile("unicode.str.not.supported");
 453         case CONSTANT_Class:
 454             poolObj[i] = readClassOrType(getChar(index + 1));
 455             break;
 456         case CONSTANT_String:
 457             // FIXME: (footprint) do not use toString here
 458             poolObj[i] = readName(getChar(index + 1)).toString();
 459             break;
 460         case CONSTANT_Fieldref: {
 461             ClassSymbol owner = readClassSymbol(getChar(index + 1));
 462             NameAndType nt = (NameAndType)readPool(getChar(index + 3));
 463             poolObj[i] = new VarSymbol(0, nt.name, nt.type, owner);
 464             break;
 465         }
 466         case CONSTANT_Methodref:
 467         case CONSTANT_InterfaceMethodref: {
 468             ClassSymbol owner = readClassSymbol(getChar(index + 1));
 469             NameAndType nt = (NameAndType)readPool(getChar(index + 3));
 470             poolObj[i] = new MethodSymbol(0, nt.name, nt.type, owner);
 471             break;
 472         }
 473         case CONSTANT_NameandType:
 474             poolObj[i] = new NameAndType(
 475                 readName(getChar(index + 1)),
 476                 readType(getChar(index + 3)));
 477             break;
 478         case CONSTANT_Integer:
 479             poolObj[i] = getInt(index + 1);
 480             break;
 481         case CONSTANT_Float:
 482             poolObj[i] = new Float(getFloat(index + 1));
 483             break;
 484         case CONSTANT_Long:
 485             poolObj[i] = new Long(getLong(index + 1));
 486             break;
 487         case CONSTANT_Double:
 488             poolObj[i] = new Double(getDouble(index + 1));
 489             break;
 490         default:
 491             throw badClassFile("bad.const.pool.tag", Byte.toString(tag));
 492         }
 493         return poolObj[i];
 494     }
 495 
 496     /** Read signature and convert to type.
 497      */
 498     Type readType(int i) {
 499         int index = poolIdx[i];
 500         return sigToType(buf, index + 3, getChar(index + 1));
 501     }
 502 
 503     /** If name is an array type or class signature, return the
 504      *  corresponding type; otherwise return a ClassSymbol with given name.
 505      */
 506     Object readClassOrType(int i) {
 507         int index =  poolIdx[i];
 508         int len = getChar(index + 1);
 509         int start = index + 3;
 510         assert buf[start] == '[' || buf[start + len - 1] != ';';
 511         // by the above assertion, the following test can be
 512         // simplified to (buf[start] == '[')
 513         return (buf[start] == '[' || buf[start + len - 1] == ';')
 514             ? (Object)sigToType(buf, start, len)
 515             : (Object)enterClass(names.fromUtf(internalize(buf, start,
 516                                                            len)));
 517     }
 518 
 519     /** Read signature and convert to type parameters.
 520      */
 521     List<Type> readTypeParams(int i) {
 522         int index = poolIdx[i];
 523         return sigToTypeParams(buf, index + 3, getChar(index + 1));
 524     }
 525 
 526     /** Read class entry.
 527      */
 528     ClassSymbol readClassSymbol(int i) {
 529         return (ClassSymbol) (readPool(i));
 530     }
 531 
 532     /** Read name.
 533      */
 534     Name readName(int i) {
 535         return (Name) (readPool(i));
 536     }
 537 
 538 /************************************************************************
 539  * Reading Types
 540  ***********************************************************************/
 541 
 542     /** The unread portion of the currently read type is
 543      *  signature[sigp..siglimit-1].
 544      */
 545     byte[] signature;
 546     int sigp;
 547     int siglimit;
 548     boolean sigEnterPhase = false;
 549 
 550     /** Convert signature to type, where signature is a byte array segment.
 551      */
 552     Type sigToType(byte[] sig, int offset, int len) {
 553         signature = sig;
 554         sigp = offset;
 555         siglimit = offset + len;
 556         return sigToType();
 557     }
 558 
 559     /** Convert signature to type, where signature is implicit.
 560      */
 561     Type sigToType() {
 562         switch ((char) signature[sigp]) {
 563         case 'T':
 564             sigp++;
 565             int start = sigp;
 566             while (signature[sigp] != ';') sigp++;
 567             sigp++;
 568             return sigEnterPhase
 569                 ? Type.noType
 570                 : findTypeVar(names.fromUtf(signature, start, sigp - 1 - start));
 571         case '+': {
 572             sigp++;
 573             Type t = sigToType();
 574             return new WildcardType(t, BoundKind.EXTENDS,
 575                                     syms.boundClass);
 576         }
 577         case '*':
 578             sigp++;
 579             return new WildcardType(syms.objectType, BoundKind.UNBOUND,
 580                                     syms.boundClass);
 581         case '-': {
 582             sigp++;
 583             Type t = sigToType();
 584             return new WildcardType(t, BoundKind.SUPER,
 585                                     syms.boundClass);
 586         }
 587         case 'B':
 588             sigp++;
 589             return syms.byteType;
 590         case 'C':
 591             sigp++;
 592             return syms.charType;
 593         case 'D':
 594             sigp++;
 595             return syms.doubleType;
 596         case 'F':
 597             sigp++;
 598             return syms.floatType;
 599         case 'I':
 600             sigp++;
 601             return syms.intType;
 602         case 'J':
 603             sigp++;
 604             return syms.longType;
 605         case 'L':
 606             {
 607                 // int oldsigp = sigp;
 608                 Type t = classSigToType();
 609                 if (sigp < siglimit && signature[sigp] == '.')
 610                     throw badClassFile("deprecated inner class signature syntax " +
 611                                        "(please recompile from source)");
 612                 /*
 613                 System.err.println(" decoded " +
 614                                    new String(signature, oldsigp, sigp-oldsigp) +
 615                                    " => " + t + " outer " + t.outer());
 616                 */
 617                 return t;
 618             }
 619         case 'S':
 620             sigp++;
 621             return syms.shortType;
 622         case 'V':
 623             sigp++;
 624             return syms.voidType;
 625         case 'Z':
 626             sigp++;
 627             return syms.booleanType;
 628         case '[':
 629             sigp++;
 630             return new ArrayType(sigToType(), syms.arrayClass);
 631         case '(':
 632             sigp++;
 633             List<Type> argtypes = sigToTypes(')');
 634             Type restype = sigToType();
 635             List<Type> thrown = List.nil();
 636             while (signature[sigp] == '^') {
 637                 sigp++;
 638                 thrown = thrown.prepend(sigToType());
 639             }
 640             return new MethodType(argtypes,
 641                                   restype,
 642                                   thrown.reverse(),
 643                                   syms.methodClass);
 644         case '<':
 645             typevars = typevars.dup(currentOwner);
 646             Type poly = new ForAll(sigToTypeParams(), sigToType());
 647             typevars = typevars.leave();
 648             return poly;
 649         default:
 650             throw badClassFile("bad.signature",
 651                                Convert.utf2string(signature, sigp, 10));
 652         }
 653     }
 654 
 655     byte[] signatureBuffer = new byte[0];
 656     int sbp = 0;
 657     /** Convert class signature to type, where signature is implicit.
 658      */
 659     Type classSigToType() {
 660         if (signature[sigp] != 'L')
 661             throw badClassFile("bad.class.signature",
 662                                Convert.utf2string(signature, sigp, 10));
 663         sigp++;
 664         Type outer = Type.noType;
 665         int startSbp = sbp;
 666 
 667         while (true) {
 668             final byte c = signature[sigp++];
 669             switch (c) {
 670 
 671             case ';': {         // end
 672                 ClassSymbol t = enterClass(names.fromUtf(signatureBuffer,
 673                                                          startSbp,
 674                                                          sbp - startSbp));
 675                 if (outer == Type.noType)
 676                     outer = t.erasure(types);
 677                 else
 678                     outer = new ClassType(outer, List.<Type>nil(), t);
 679                 sbp = startSbp;
 680                 return outer;
 681             }
 682 
 683             case '<':           // generic arguments
 684                 ClassSymbol t = enterClass(names.fromUtf(signatureBuffer,
 685                                                          startSbp,
 686                                                          sbp - startSbp));
 687                 outer = new ClassType(outer, sigToTypes('>'), t) {
 688                         boolean completed = false;
 689                         @Override
 690                         public Type getEnclosingType() {
 691                             if (!completed) {
 692                                 completed = true;
 693                                 tsym.complete();
 694                                 Type enclosingType = tsym.type.getEnclosingType();
 695                                 if (enclosingType != Type.noType) {
 696                                     List<Type> typeArgs =
 697                                         super.getEnclosingType().allparams();
 698                                     List<Type> typeParams =
 699                                         enclosingType.allparams();
 700                                     if (typeParams.length() != typeArgs.length()) {
 701                                         // no "rare" types
 702                                         super.setEnclosingType(types.erasure(enclosingType));
 703                                     } else {
 704                                         super.setEnclosingType(types.subst(enclosingType,
 705                                                                            typeParams,
 706                                                                            typeArgs));
 707                                     }
 708                                 } else {
 709                                     super.setEnclosingType(Type.noType);
 710                                 }
 711                             }
 712                             return super.getEnclosingType();
 713                         }
 714                         @Override
 715                         public void setEnclosingType(Type outer) {
 716                             throw new UnsupportedOperationException();
 717                         }
 718                     };
 719                 switch (signature[sigp++]) {
 720                 case ';':
 721                     if (sigp < signature.length && signature[sigp] == '.') {
 722                         // support old-style GJC signatures
 723                         // The signature produced was
 724                         // Lfoo/Outer<Lfoo/X;>;.Lfoo/Outer$Inner<Lfoo/Y;>;
 725                         // rather than say
 726                         // Lfoo/Outer<Lfoo/X;>.Inner<Lfoo/Y;>;
 727                         // so we skip past ".Lfoo/Outer$"
 728                         sigp += (sbp - startSbp) + // "foo/Outer"
 729                             3;  // ".L" and "$"
 730                         signatureBuffer[sbp++] = (byte)'$';
 731                         break;
 732                     } else {
 733                         sbp = startSbp;
 734                         return outer;
 735                     }
 736                 case '.':
 737                     signatureBuffer[sbp++] = (byte)'$';
 738                     break;
 739                 default:
 740                     throw new AssertionError(signature[sigp-1]);
 741                 }
 742                 continue;
 743 
 744             case '.':
 745                 signatureBuffer[sbp++] = (byte)'$';
 746                 continue;
 747             case '/':
 748                 signatureBuffer[sbp++] = (byte)'.';
 749                 continue;
 750             default:
 751                 signatureBuffer[sbp++] = c;
 752                 continue;
 753             }
 754         }
 755     }
 756 
 757     /** Convert (implicit) signature to list of types
 758      *  until `terminator' is encountered.
 759      */
 760     List<Type> sigToTypes(char terminator) {
 761         List<Type> head = List.of(null);
 762         List<Type> tail = head;
 763         while (signature[sigp] != terminator)
 764             tail = tail.setTail(List.of(sigToType()));
 765         sigp++;
 766         return head.tail;
 767     }
 768 
 769     /** Convert signature to type parameters, where signature is a byte
 770      *  array segment.
 771      */
 772     List<Type> sigToTypeParams(byte[] sig, int offset, int len) {
 773         signature = sig;
 774         sigp = offset;
 775         siglimit = offset + len;
 776         return sigToTypeParams();
 777     }
 778 
 779     /** Convert signature to type parameters, where signature is implicit.
 780      */
 781     List<Type> sigToTypeParams() {
 782         List<Type> tvars = List.nil();
 783         if (signature[sigp] == '<') {
 784             sigp++;
 785             int start = sigp;
 786             sigEnterPhase = true;
 787             while (signature[sigp] != '>')
 788                 tvars = tvars.prepend(sigToTypeParam());
 789             sigEnterPhase = false;
 790             sigp = start;
 791             while (signature[sigp] != '>')
 792                 sigToTypeParam();
 793             sigp++;
 794         }
 795         return tvars.reverse();
 796     }
 797 
 798     /** Convert (implicit) signature to type parameter.
 799      */
 800     Type sigToTypeParam() {
 801         int start = sigp;
 802         while (signature[sigp] != ':') sigp++;
 803         Name name = names.fromUtf(signature, start, sigp - start);
 804         TypeVar tvar;
 805         if (sigEnterPhase) {
 806             tvar = new TypeVar(name, currentOwner, syms.botType);
 807             typevars.enter(tvar.tsym);
 808         } else {
 809             tvar = (TypeVar)findTypeVar(name);
 810         }
 811         List<Type> bounds = List.nil();
 812         Type st = null;
 813         if (signature[sigp] == ':' && signature[sigp+1] == ':') {
 814             sigp++;
 815             st = syms.objectType;
 816         }
 817         while (signature[sigp] == ':') {
 818             sigp++;
 819             bounds = bounds.prepend(sigToType());
 820         }
 821         if (!sigEnterPhase) {
 822             types.setBounds(tvar, bounds.reverse(), st);
 823         }
 824         return tvar;
 825     }
 826 
 827     /** Find type variable with given name in `typevars' scope.
 828      */
 829     Type findTypeVar(Name name) {
 830         Scope.Entry e = typevars.lookup(name);
 831         if (e.scope != null) {
 832             return e.sym.type;
 833         } else {
 834             if (readingClassAttr) {
 835                 // While reading the class attribute, the supertypes
 836                 // might refer to a type variable from an enclosing element
 837                 // (method or class).
 838                 // If the type variable is defined in the enclosing class,
 839                 // we can actually find it in
 840                 // currentOwner.owner.type.getTypeArguments()
 841                 // However, until we have read the enclosing method attribute
 842                 // we don't know for sure if this owner is correct.  It could
 843                 // be a method and there is no way to tell before reading the
 844                 // enclosing method attribute.
 845                 TypeVar t = new TypeVar(name, currentOwner, syms.botType);
 846                 missingTypeVariables = missingTypeVariables.prepend(t);
 847                 // System.err.println("Missing type var " + name);
 848                 return t;
 849             }
 850             throw badClassFile("undecl.type.var", name);
 851         }
 852     }
 853 
 854 /************************************************************************
 855  * Reading Attributes
 856  ***********************************************************************/
 857 
 858     protected enum AttributeKind { CLASS, MEMBER };
 859     protected abstract class AttributeReader {
 860         AttributeReader(Name name, Version version, Set<AttributeKind> kinds) {
 861             this.name = name;
 862             this.version = version;
 863             this.kinds = kinds;
 864         }
 865 
 866         boolean accepts(AttributeKind kind) {
 867             return kinds.contains(kind) && majorVersion >= version.major;
 868         }
 869 
 870         abstract void read(Symbol sym, int attrLen);
 871 
 872         final Name name;
 873         final Version version;
 874         final Set<AttributeKind> kinds;
 875     }
 876 
 877     protected Set<AttributeKind> CLASS_ATTRIBUTE =
 878             EnumSet.of(AttributeKind.CLASS);
 879     protected Set<AttributeKind> MEMBER_ATTRIBUTE =
 880             EnumSet.of(AttributeKind.MEMBER);
 881     protected Set<AttributeKind> CLASS_OR_MEMBER_ATTRIBUTE =
 882             EnumSet.of(AttributeKind.CLASS, AttributeKind.MEMBER);
 883 
 884     protected Map<Name, AttributeReader> attributeReaders = new HashMap<Name, AttributeReader>();
 885 
 886     protected void initAttributeReaders() {
 887         AttributeReader[] readers = {
 888             // v45.3 attributes
 889 
 890             new AttributeReader(names.Code, V45_3, MEMBER_ATTRIBUTE) {
 891                 void read(Symbol sym, int attrLen) {
 892                     if (readAllOfClassFile || saveParameterNames)
 893                         ((MethodSymbol)sym).code = readCode(sym);
 894                     else
 895                         bp = bp + attrLen;
 896                 }
 897             },
 898 
 899             new AttributeReader(names.ConstantValue, V45_3, MEMBER_ATTRIBUTE) {
 900                 void read(Symbol sym, int attrLen) {
 901                     Object v = readPool(nextChar());
 902                     // Ignore ConstantValue attribute if field not final.
 903                     if ((sym.flags() & FINAL) != 0)
 904                         ((VarSymbol) sym).setData(v);
 905                 }
 906             },
 907 
 908             new AttributeReader(names.Deprecated, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
 909                 void read(Symbol sym, int attrLen) {
 910                     sym.flags_field |= DEPRECATED;
 911                 }
 912             },
 913 
 914             new AttributeReader(names.Exceptions, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
 915                 void read(Symbol sym, int attrLen) {
 916                     int nexceptions = nextChar();
 917                     List<Type> thrown = List.nil();
 918                     for (int j = 0; j < nexceptions; j++)
 919                         thrown = thrown.prepend(readClassSymbol(nextChar()).type);
 920                     if (sym.type.getThrownTypes().isEmpty())
 921                         sym.type.asMethodType().thrown = thrown.reverse();
 922                 }
 923             },
 924 
 925             new AttributeReader(names.InnerClasses, V45_3, CLASS_ATTRIBUTE) {
 926                 void read(Symbol sym, int attrLen) {
 927                     ClassSymbol c = (ClassSymbol) sym;
 928                     readInnerClasses(c);
 929                 }
 930             },
 931 
 932             new AttributeReader(names.LocalVariableTable, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
 933                 void read(Symbol sym, int attrLen) {
 934                     int newbp = bp + attrLen;
 935                     if (saveParameterNames) {
 936                         // Pick up parameter names from the variable table.
 937                         // Parameter names are not explicitly identified as such,
 938                         // but all parameter name entries in the LocalVariableTable
 939                         // have a start_pc of 0.  Therefore, we record the name
 940                         // indicies of all slots with a start_pc of zero in the
 941                         // parameterNameIndicies array.
 942                         // Note that this implicitly honors the JVMS spec that
 943                         // there may be more than one LocalVariableTable, and that
 944                         // there is no specified ordering for the entries.
 945                         int numEntries = nextChar();
 946                         for (int i = 0; i < numEntries; i++) {
 947                             int start_pc = nextChar();
 948                             int length = nextChar();
 949                             int nameIndex = nextChar();
 950                             int sigIndex = nextChar();
 951                             int register = nextChar();
 952                             if (start_pc == 0) {
 953                                 // ensure array large enough
 954                                 if (register >= parameterNameIndices.length) {
 955                                     int newSize = Math.max(register, parameterNameIndices.length + 8);
 956                                     parameterNameIndices =
 957                                             Arrays.copyOf(parameterNameIndices, newSize);
 958                                 }
 959                                 parameterNameIndices[register] = nameIndex;
 960                                 haveParameterNameIndices = true;
 961                             }
 962                         }
 963                     }
 964                     bp = newbp;
 965                 }
 966             },
 967 
 968             new AttributeReader(names.SourceFile, V45_3, CLASS_ATTRIBUTE) {
 969                 void read(Symbol sym, int attrLen) {
 970                     ClassSymbol c = (ClassSymbol) sym;
 971                     Name n = readName(nextChar());
 972                     c.sourcefile = new SourceFileObject(n, c.flatname);
 973                 }
 974             },
 975 
 976             new AttributeReader(names.Synthetic, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
 977                 void read(Symbol sym, int attrLen) {
 978                     // bridge methods are visible when generics not enabled
 979                     if (allowGenerics || (sym.flags_field & BRIDGE) == 0)
 980                         sym.flags_field |= SYNTHETIC;
 981                 }
 982             },
 983 
 984             // standard v49 attributes
 985 
 986             new AttributeReader(names.EnclosingMethod, V49, CLASS_ATTRIBUTE) {
 987                 void read(Symbol sym, int attrLen) {
 988                     int newbp = bp + attrLen;
 989                     readEnclosingMethodAttr(sym);
 990                     bp = newbp;
 991                 }
 992             },
 993 
 994             new AttributeReader(names.Signature, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
 995                 @Override
 996                 boolean accepts(AttributeKind kind) {
 997                     return super.accepts(kind) && allowGenerics;
 998                 }
 999 
1000                 void read(Symbol sym, int attrLen) {
1001                     if (sym.kind == TYP) {
1002                         ClassSymbol c = (ClassSymbol) sym;
1003                         readingClassAttr = true;
1004                         try {
1005                             ClassType ct1 = (ClassType)c.type;
1006                             assert c == currentOwner;
1007                             ct1.typarams_field = readTypeParams(nextChar());
1008                             ct1.supertype_field = sigToType();
1009                             ListBuffer<Type> is = new ListBuffer<Type>();
1010                             while (sigp != siglimit) is.append(sigToType());
1011                             ct1.interfaces_field = is.toList();
1012                         } finally {
1013                             readingClassAttr = false;
1014                         }
1015                     } else {
1016                         List<Type> thrown = sym.type.getThrownTypes();
1017                         sym.type = readType(nextChar());
1018                         //- System.err.println(" # " + sym.type);
1019                         if (sym.kind == MTH && sym.type.getThrownTypes().isEmpty())
1020                             sym.type.asMethodType().thrown = thrown;
1021 
1022                     }
1023                 }
1024             },
1025 
1026             // v49 annotation attributes
1027 
1028             new AttributeReader(names.AnnotationDefault, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1029                 void read(Symbol sym, int attrLen) {
1030                     attachAnnotationDefault(sym);
1031                 }
1032             },
1033 
1034             new AttributeReader(names.RuntimeInvisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1035                 void read(Symbol sym, int attrLen) {
1036                     attachAnnotations(sym);
1037                 }
1038             },
1039 
1040             new AttributeReader(names.RuntimeInvisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1041                 void read(Symbol sym, int attrLen) {
1042                     attachParameterAnnotations(sym);
1043                 }
1044             },
1045 
1046             new AttributeReader(names.RuntimeVisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1047                 void read(Symbol sym, int attrLen) {
1048                     attachAnnotations(sym);
1049                 }
1050             },
1051 
1052             new AttributeReader(names.RuntimeVisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1053                 void read(Symbol sym, int attrLen) {
1054                     attachParameterAnnotations(sym);
1055                 }
1056             },
1057 
1058             // additional "legacy" v49 attributes, superceded by flags
1059 
1060             new AttributeReader(names.Annotation, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1061                 void read(Symbol sym, int attrLen) {
1062                     if (allowAnnotations)
1063                         sym.flags_field |= ANNOTATION;
1064                 }
1065             },
1066 
1067             new AttributeReader(names.Bridge, V49, MEMBER_ATTRIBUTE) {
1068                 void read(Symbol sym, int attrLen) {
1069                     sym.flags_field |= BRIDGE;
1070                     if (!allowGenerics)
1071                         sym.flags_field &= ~SYNTHETIC;
1072                 }
1073             },
1074 
1075             new AttributeReader(names.Enum, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1076                 void read(Symbol sym, int attrLen) {
1077                     sym.flags_field |= ENUM;
1078                 }
1079             },
1080 
1081             new AttributeReader(names.Varargs, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1082                 void read(Symbol sym, int attrLen) {
1083                     if (allowVarargs)
1084                         sym.flags_field |= VARARGS;
1085                 }
1086             },
1087 
1088             // v51 attributes
1089             new AttributeReader(names.RuntimeVisibleTypeAnnotations, V51, CLASS_OR_MEMBER_ATTRIBUTE) {
1090                 void read(Symbol sym, int attrLen) {
1091                     attachTypeAnnotations(sym);
1092                 }
1093             },
1094 
1095             new AttributeReader(names.RuntimeInvisibleTypeAnnotations, V51, CLASS_OR_MEMBER_ATTRIBUTE) {
1096                 void read(Symbol sym, int attrLen) {
1097                     attachTypeAnnotations(sym);
1098                 }
1099             },
1100 
1101 
1102             // The following attributes for a Code attribute are not currently handled
1103             // StackMapTable
1104             // SourceDebugExtension
1105             // LineNumberTable
1106             // LocalVariableTypeTable
1107         };
1108 
1109         for (AttributeReader r: readers)
1110             attributeReaders.put(r.name, r);
1111     }
1112 
1113     /** Report unrecognized attribute.
1114      */
1115     void unrecognized(Name attrName) {
1116         if (checkClassFile)
1117             printCCF("ccf.unrecognized.attribute", attrName);
1118     }
1119 
1120 
1121 
1122     void readEnclosingMethodAttr(Symbol sym) {
1123         // sym is a nested class with an "Enclosing Method" attribute
1124         // remove sym from it's current owners scope and place it in
1125         // the scope specified by the attribute
1126         sym.owner.members().remove(sym);
1127         ClassSymbol self = (ClassSymbol)sym;
1128         ClassSymbol c = readClassSymbol(nextChar());
1129         NameAndType nt = (NameAndType)readPool(nextChar());
1130 
1131         MethodSymbol m = findMethod(nt, c.members_field, self.flags());
1132         if (nt != null && m == null)
1133             throw badClassFile("bad.enclosing.method", self);
1134 
1135         self.name = simpleBinaryName(self.flatname, c.flatname) ;
1136         self.owner = m != null ? m : c;
1137         if (self.name.isEmpty())
1138             self.fullname = names.empty;
1139         else
1140             self.fullname = ClassSymbol.formFullName(self.name, self.owner);
1141 
1142         if (m != null) {
1143             ((ClassType)sym.type).setEnclosingType(m.type);
1144         } else if ((self.flags_field & STATIC) == 0) {
1145             ((ClassType)sym.type).setEnclosingType(c.type);
1146         } else {
1147             ((ClassType)sym.type).setEnclosingType(Type.noType);
1148         }
1149         enterTypevars(self);
1150         if (!missingTypeVariables.isEmpty()) {
1151             ListBuffer<Type> typeVars =  new ListBuffer<Type>();
1152             for (Type typevar : missingTypeVariables) {
1153                 typeVars.append(findTypeVar(typevar.tsym.name));
1154             }
1155             foundTypeVariables = typeVars.toList();
1156         } else {
1157             foundTypeVariables = List.nil();
1158         }
1159     }
1160 
1161     // See java.lang.Class
1162     private Name simpleBinaryName(Name self, Name enclosing) {
1163         String simpleBinaryName = self.toString().substring(enclosing.toString().length());
1164         if (simpleBinaryName.length() < 1 || simpleBinaryName.charAt(0) != '$')
1165             throw badClassFile("bad.enclosing.method", self);
1166         int index = 1;
1167         while (index < simpleBinaryName.length() &&
1168                isAsciiDigit(simpleBinaryName.charAt(index)))
1169             index++;
1170         return names.fromString(simpleBinaryName.substring(index));
1171     }
1172 
1173     private MethodSymbol findMethod(NameAndType nt, Scope scope, long flags) {
1174         if (nt == null)
1175             return null;
1176 
1177         MethodType type = nt.type.asMethodType();
1178 
1179         for (Scope.Entry e = scope.lookup(nt.name); e.scope != null; e = e.next())
1180             if (e.sym.kind == MTH && isSameBinaryType(e.sym.type.asMethodType(), type))
1181                 return (MethodSymbol)e.sym;
1182 
1183         if (nt.name != names.init)
1184             // not a constructor
1185             return null;
1186         if ((flags & INTERFACE) != 0)
1187             // no enclosing instance
1188             return null;
1189         if (nt.type.getParameterTypes().isEmpty())
1190             // no parameters
1191             return null;
1192 
1193         // A constructor of an inner class.
1194         // Remove the first argument (the enclosing instance)
1195         nt.type = new MethodType(nt.type.getParameterTypes().tail,
1196                                  nt.type.getReturnType(),
1197                                  nt.type.getThrownTypes(),
1198                                  syms.methodClass);
1199         // Try searching again
1200         return findMethod(nt, scope, flags);
1201     }
1202 
1203     /** Similar to Types.isSameType but avoids completion */
1204     private boolean isSameBinaryType(MethodType mt1, MethodType mt2) {
1205         List<Type> types1 = types.erasure(mt1.getParameterTypes())
1206             .prepend(types.erasure(mt1.getReturnType()));
1207         List<Type> types2 = mt2.getParameterTypes().prepend(mt2.getReturnType());
1208         while (!types1.isEmpty() && !types2.isEmpty()) {
1209             if (types1.head.tsym != types2.head.tsym)
1210                 return false;
1211             types1 = types1.tail;
1212             types2 = types2.tail;
1213         }
1214         return types1.isEmpty() && types2.isEmpty();
1215     }
1216 
1217     /**
1218      * Character.isDigit answers <tt>true</tt> to some non-ascii
1219      * digits.  This one does not.  <b>copied from java.lang.Class</b>
1220      */
1221     private static boolean isAsciiDigit(char c) {
1222         return '0' <= c && c <= '9';
1223     }
1224 
1225     /** Read member attributes.
1226      */
1227     void readMemberAttrs(Symbol sym) {
1228         readAttrs(sym, AttributeKind.MEMBER);
1229     }
1230 
1231     void readAttrs(Symbol sym, AttributeKind kind) {
1232         char ac = nextChar();
1233         for (int i = 0; i < ac; i++) {
1234             Name attrName = readName(nextChar());
1235             int attrLen = nextInt();
1236             AttributeReader r = attributeReaders.get(attrName);
1237             if (r != null && r.accepts(kind))
1238                 r.read(sym, attrLen);
1239             else  {
1240                 unrecognized(attrName);
1241                 bp = bp + attrLen;
1242             }
1243         }
1244     }
1245 
1246     private boolean readingClassAttr = false;
1247     private List<Type> missingTypeVariables = List.nil();
1248     private List<Type> foundTypeVariables = List.nil();
1249 
1250     /** Read class attributes.
1251      */
1252     void readClassAttrs(ClassSymbol c) {
1253         readAttrs(c, AttributeKind.CLASS);
1254     }
1255 
1256     /** Read code block.
1257      */
1258     Code readCode(Symbol owner) {
1259         nextChar(); // max_stack
1260         nextChar(); // max_locals
1261         final int  code_length = nextInt();
1262         bp += code_length;
1263         final char exception_table_length = nextChar();
1264         bp += exception_table_length * 8;
1265         readMemberAttrs(owner);
1266         return null;
1267     }
1268 
1269 /************************************************************************
1270  * Reading Java-language annotations
1271  ***********************************************************************/
1272 
1273     /** Attach annotations.
1274      */
1275     void attachAnnotations(final Symbol sym) {
1276         int numAttributes = nextChar();
1277         if (numAttributes != 0) {
1278             ListBuffer<CompoundAnnotationProxy> proxies =
1279                 new ListBuffer<CompoundAnnotationProxy>();
1280             for (int i = 0; i<numAttributes; i++) {
1281                 CompoundAnnotationProxy proxy = readCompoundAnnotation();
1282                 if (proxy.type.tsym == syms.proprietaryType.tsym)
1283                     sym.flags_field |= PROPRIETARY;
1284                 else
1285                     proxies.append(proxy);
1286             }
1287             annotate.later(new AnnotationCompleter(sym, proxies.toList()));
1288         }
1289     }
1290 
1291     /** Attach parameter annotations.
1292      */
1293     void attachParameterAnnotations(final Symbol method) {
1294         final MethodSymbol meth = (MethodSymbol)method;
1295         int numParameters = buf[bp++] & 0xFF;
1296         List<VarSymbol> parameters = meth.params();
1297         int pnum = 0;
1298         while (parameters.tail != null) {
1299             attachAnnotations(parameters.head);
1300             parameters = parameters.tail;
1301             pnum++;
1302         }
1303         if (pnum != numParameters) {
1304             throw badClassFile("bad.runtime.invisible.param.annotations", meth);
1305         }
1306     }
1307 
1308     void attachTypeAnnotations(final Symbol sym) {
1309         int numAttributes = nextChar();
1310         if (numAttributes != 0) {
1311             ListBuffer<TypeAnnotationProxy> proxies =
1312                 ListBuffer.lb();
1313             for (int i = 0; i < numAttributes; i++)
1314                 proxies.append(readTypeAnnotation());
1315             annotate.later(new TypeAnnotationCompleter(sym, proxies.toList()));
1316         }
1317     }
1318 
1319     /** Attach the default value for an annotation element.
1320      */
1321     void attachAnnotationDefault(final Symbol sym) {
1322         final MethodSymbol meth = (MethodSymbol)sym; // only on methods
1323         final Attribute value = readAttributeValue();
1324         annotate.later(new AnnotationDefaultCompleter(meth, value));
1325     }
1326 
1327     Type readTypeOrClassSymbol(int i) {
1328         // support preliminary jsr175-format class files
1329         if (buf[poolIdx[i]] == CONSTANT_Class)
1330             return readClassSymbol(i).type;
1331         return readType(i);
1332     }
1333     Type readEnumType(int i) {
1334         // support preliminary jsr175-format class files
1335         int index = poolIdx[i];
1336         int length = getChar(index + 1);
1337         if (buf[index + length + 2] != ';')
1338             return enterClass(readName(i)).type;
1339         return readType(i);
1340     }
1341 
1342     CompoundAnnotationProxy readCompoundAnnotation() {
1343         Type t = readTypeOrClassSymbol(nextChar());
1344         int numFields = nextChar();
1345         ListBuffer<Pair<Name,Attribute>> pairs =
1346             new ListBuffer<Pair<Name,Attribute>>();
1347         for (int i=0; i<numFields; i++) {
1348             Name name = readName(nextChar());
1349             Attribute value = readAttributeValue();
1350             pairs.append(new Pair<Name,Attribute>(name, value));
1351         }
1352         return new CompoundAnnotationProxy(t, pairs.toList());
1353     }
1354 
1355     TypeAnnotationProxy readTypeAnnotation() {
1356         CompoundAnnotationProxy proxy = readCompoundAnnotation();
1357         TypeAnnotationPosition position = readPosition();
1358 
1359         if (debugJSR308)
1360             System.out.println("TA: reading: " + proxy + " @ " + position
1361                     + " in " + log.currentSourceFile());
1362 
1363         return new TypeAnnotationProxy(proxy, position);
1364     }
1365 
1366     TypeAnnotationPosition readPosition() {
1367         byte tag = nextByte();
1368 
1369         if (!TargetType.isValidTargetTypeValue(tag))
1370             throw this.badClassFile("bad.type.annotation.value", tag);
1371 
1372         TypeAnnotationPosition position = new TypeAnnotationPosition();
1373         TargetType type = TargetType.fromTargetTypeValue(tag);
1374 
1375         position.type = type;
1376 
1377         switch (type) {
1378         // type case
1379         case TYPECAST:
1380         case TYPECAST_GENERIC_OR_ARRAY:
1381         // object creation
1382         case INSTANCEOF:
1383         case INSTANCEOF_GENERIC_OR_ARRAY:
1384         // new expression
1385         case NEW:
1386         case NEW_GENERIC_OR_ARRAY:
1387             position.offset = nextChar();
1388             break;
1389          // local variable
1390         case LOCAL_VARIABLE:
1391         case LOCAL_VARIABLE_GENERIC_OR_ARRAY:
1392             int table_length = nextChar();
1393             position.lvarOffset = new int[table_length];
1394             position.lvarLength = new int[table_length];
1395             position.lvarIndex = new int[table_length];
1396 
1397             for (int i = 0; i < table_length; ++i) {
1398                 position.lvarOffset[i] = nextChar();
1399                 position.lvarLength[i] = nextChar();
1400                 position.lvarIndex[i] = nextChar();
1401             }
1402             break;
1403          // method receiver
1404         case METHOD_RECEIVER:
1405             // Do nothing
1406             break;
1407         // type parameters
1408         case CLASS_TYPE_PARAMETER:
1409         case METHOD_TYPE_PARAMETER:
1410             position.parameter_index = nextByte();
1411             break;
1412         // type parameter bounds
1413         case CLASS_TYPE_PARAMETER_BOUND:
1414         case CLASS_TYPE_PARAMETER_BOUND_GENERIC_OR_ARRAY:
1415         case METHOD_TYPE_PARAMETER_BOUND:
1416         case METHOD_TYPE_PARAMETER_BOUND_GENERIC_OR_ARRAY:
1417             position.parameter_index = nextByte();
1418             position.bound_index = nextByte();
1419             break;
1420          // wildcard
1421         case WILDCARD_BOUND:
1422         case WILDCARD_BOUND_GENERIC_OR_ARRAY:
1423             position.wildcard_position = readPosition();
1424             break;
1425          // Class extends and implements clauses
1426         case CLASS_EXTENDS:
1427         case CLASS_EXTENDS_GENERIC_OR_ARRAY:
1428             position.type_index = nextChar();
1429             break;
1430         // throws
1431         case THROWS:
1432             position.type_index = nextChar();
1433             break;
1434         case CLASS_LITERAL:
1435         case CLASS_LITERAL_GENERIC_OR_ARRAY:
1436             position.offset = nextChar();
1437             break;
1438         // method parameter: not specified
1439         case METHOD_PARAMETER_GENERIC_OR_ARRAY:
1440             position.parameter_index = nextByte();
1441             break;
1442         // method type argument: wasn't specified
1443         case NEW_TYPE_ARGUMENT:
1444         case NEW_TYPE_ARGUMENT_GENERIC_OR_ARRAY:
1445         case METHOD_TYPE_ARGUMENT:
1446         case METHOD_TYPE_ARGUMENT_GENERIC_OR_ARRAY:
1447             position.offset = nextChar();
1448             position.type_index = nextByte();
1449             break;
1450         // We don't need to worry abut these
1451         case METHOD_RETURN_GENERIC_OR_ARRAY:
1452         case FIELD_GENERIC_OR_ARRAY:
1453             break;
1454         case UNKNOWN:
1455             break;
1456         default:
1457             throw new AssertionError("unknown type: " + position);
1458         }
1459 
1460         if (type.hasLocation()) {
1461             int len = nextChar();
1462             ListBuffer<Integer> loc = ListBuffer.lb();
1463             for (int i = 0; i < len; i++)
1464                 loc = loc.append((int)nextByte());
1465             position.location = loc.toList();
1466         }
1467 
1468         return position;
1469     }
1470     Attribute readAttributeValue() {
1471         char c = (char) buf[bp++];
1472         switch (c) {
1473         case 'B':
1474             return new Attribute.Constant(syms.byteType, readPool(nextChar()));
1475         case 'C':
1476             return new Attribute.Constant(syms.charType, readPool(nextChar()));
1477         case 'D':
1478             return new Attribute.Constant(syms.doubleType, readPool(nextChar()));
1479         case 'F':
1480             return new Attribute.Constant(syms.floatType, readPool(nextChar()));
1481         case 'I':
1482             return new Attribute.Constant(syms.intType, readPool(nextChar()));
1483         case 'J':
1484             return new Attribute.Constant(syms.longType, readPool(nextChar()));
1485         case 'S':
1486             return new Attribute.Constant(syms.shortType, readPool(nextChar()));
1487         case 'Z':
1488             return new Attribute.Constant(syms.booleanType, readPool(nextChar()));
1489         case 's':
1490             return new Attribute.Constant(syms.stringType, readPool(nextChar()).toString());
1491         case 'e':
1492             return new EnumAttributeProxy(readEnumType(nextChar()), readName(nextChar()));
1493         case 'c':
1494             return new Attribute.Class(types, readTypeOrClassSymbol(nextChar()));
1495         case '[': {
1496             int n = nextChar();
1497             ListBuffer<Attribute> l = new ListBuffer<Attribute>();
1498             for (int i=0; i<n; i++)
1499                 l.append(readAttributeValue());
1500             return new ArrayAttributeProxy(l.toList());
1501         }
1502         case '@':
1503             return readCompoundAnnotation();
1504         default:
1505             throw new AssertionError("unknown annotation tag '" + c + "'");
1506         }
1507     }
1508 
1509     interface ProxyVisitor extends Attribute.Visitor {
1510         void visitEnumAttributeProxy(EnumAttributeProxy proxy);
1511         void visitArrayAttributeProxy(ArrayAttributeProxy proxy);
1512         void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy);
1513     }
1514 
1515     static class EnumAttributeProxy extends Attribute {
1516         Type enumType;
1517         Name enumerator;
1518         public EnumAttributeProxy(Type enumType, Name enumerator) {
1519             super(null);
1520             this.enumType = enumType;
1521             this.enumerator = enumerator;
1522         }
1523         public void accept(Visitor v) { ((ProxyVisitor)v).visitEnumAttributeProxy(this); }
1524         @Override
1525         public String toString() {
1526             return "/*proxy enum*/" + enumType + "." + enumerator;
1527         }
1528     }
1529 
1530     static class ArrayAttributeProxy extends Attribute {
1531         List<Attribute> values;
1532         ArrayAttributeProxy(List<Attribute> values) {
1533             super(null);
1534             this.values = values;
1535         }
1536         public void accept(Visitor v) { ((ProxyVisitor)v).visitArrayAttributeProxy(this); }
1537         @Override
1538         public String toString() {
1539             return "{" + values + "}";
1540         }
1541     }
1542 
1543     /** A temporary proxy representing a compound attribute.
1544      */
1545     static class CompoundAnnotationProxy extends Attribute {
1546         final List<Pair<Name,Attribute>> values;
1547         public CompoundAnnotationProxy(Type type,
1548                                       List<Pair<Name,Attribute>> values) {
1549             super(type);
1550             this.values = values;
1551         }
1552         public void accept(Visitor v) { ((ProxyVisitor)v).visitCompoundAnnotationProxy(this); }
1553         @Override
1554         public String toString() {
1555             StringBuffer buf = new StringBuffer();
1556             buf.append("@");
1557             buf.append(type.tsym.getQualifiedName());
1558             buf.append("/*proxy*/{");
1559             boolean first = true;
1560             for (List<Pair<Name,Attribute>> v = values;
1561                  v.nonEmpty(); v = v.tail) {
1562                 Pair<Name,Attribute> value = v.head;
1563                 if (!first) buf.append(",");
1564                 first = false;
1565                 buf.append(value.fst);
1566                 buf.append("=");
1567                 buf.append(value.snd);
1568             }
1569             buf.append("}");
1570             return buf.toString();
1571         }
1572     }
1573 
1574     /** A temporary proxy representing a type annotation.
1575      */
1576     static class TypeAnnotationProxy {
1577         final CompoundAnnotationProxy compound;
1578         final TypeAnnotationPosition position;
1579         public TypeAnnotationProxy(CompoundAnnotationProxy compound,
1580                 TypeAnnotationPosition position) {
1581             this.compound = compound;
1582             this.position = position;
1583         }
1584     }
1585 
1586     class AnnotationDeproxy implements ProxyVisitor {
1587         private ClassSymbol requestingOwner = currentOwner.kind == MTH
1588             ? currentOwner.enclClass() : (ClassSymbol)currentOwner;
1589 
1590         List<Attribute.Compound> deproxyCompoundList(List<CompoundAnnotationProxy> pl) {
1591             // also must fill in types!!!!
1592             ListBuffer<Attribute.Compound> buf =
1593                 new ListBuffer<Attribute.Compound>();
1594             for (List<CompoundAnnotationProxy> l = pl; l.nonEmpty(); l=l.tail) {
1595                 buf.append(deproxyCompound(l.head));
1596             }
1597             return buf.toList();
1598         }
1599 
1600         Attribute.Compound deproxyCompound(CompoundAnnotationProxy a) {
1601             ListBuffer<Pair<Symbol.MethodSymbol,Attribute>> buf =
1602                 new ListBuffer<Pair<Symbol.MethodSymbol,Attribute>>();
1603             for (List<Pair<Name,Attribute>> l = a.values;
1604                  l.nonEmpty();
1605                  l = l.tail) {
1606                 MethodSymbol meth = findAccessMethod(a.type, l.head.fst);
1607                 buf.append(new Pair<Symbol.MethodSymbol,Attribute>
1608                            (meth, deproxy(meth.type.getReturnType(), l.head.snd)));
1609             }
1610             return new Attribute.Compound(a.type, buf.toList());
1611         }
1612 
1613         MethodSymbol findAccessMethod(Type container, Name name) {
1614             CompletionFailure failure = null;
1615             try {
1616                 for (Scope.Entry e = container.tsym.members().lookup(name);
1617                      e.scope != null;
1618                      e = e.next()) {
1619                     Symbol sym = e.sym;
1620                     if (sym.kind == MTH && sym.type.getParameterTypes().length() == 0)
1621                         return (MethodSymbol) sym;
1622                 }
1623             } catch (CompletionFailure ex) {
1624                 failure = ex;
1625             }
1626             // The method wasn't found: emit a warning and recover
1627             JavaFileObject prevSource = log.useSource(requestingOwner.classfile);
1628             try {
1629                 if (failure == null) {
1630                     log.warning("annotation.method.not.found",
1631                                 container,
1632                                 name);
1633                 } else {
1634                     log.warning("annotation.method.not.found.reason",
1635                                 container,
1636                                 name,
1637                                 failure.getDetailValue());//diagnostic, if present
1638                 }
1639             } finally {
1640                 log.useSource(prevSource);
1641             }
1642             // Construct a new method type and symbol.  Use bottom
1643             // type (typeof null) as return type because this type is
1644             // a subtype of all reference types and can be converted
1645             // to primitive types by unboxing.
1646             MethodType mt = new MethodType(List.<Type>nil(),
1647                                            syms.botType,
1648                                            List.<Type>nil(),
1649                                            syms.methodClass);
1650             return new MethodSymbol(PUBLIC | ABSTRACT, name, mt, container.tsym);
1651         }
1652 
1653         Attribute result;
1654         Type type;
1655         Attribute deproxy(Type t, Attribute a) {
1656             Type oldType = type;
1657             try {
1658                 type = t;
1659                 a.accept(this);
1660                 return result;
1661             } finally {
1662                 type = oldType;
1663             }
1664         }
1665 
1666         // implement Attribute.Visitor below
1667 
1668         public void visitConstant(Attribute.Constant value) {
1669             // assert value.type == type;
1670             result = value;
1671         }
1672 
1673         public void visitClass(Attribute.Class clazz) {
1674             result = clazz;
1675         }
1676 
1677         public void visitEnum(Attribute.Enum e) {
1678             throw new AssertionError(); // shouldn't happen
1679         }
1680 
1681         public void visitCompound(Attribute.Compound compound) {
1682             throw new AssertionError(); // shouldn't happen
1683         }
1684 
1685         public void visitArray(Attribute.Array array) {
1686             throw new AssertionError(); // shouldn't happen
1687         }
1688 
1689         public void visitError(Attribute.Error e) {
1690             throw new AssertionError(); // shouldn't happen
1691         }
1692 
1693         public void visitEnumAttributeProxy(EnumAttributeProxy proxy) {
1694             // type.tsym.flatName() should == proxy.enumFlatName
1695             TypeSymbol enumTypeSym = proxy.enumType.tsym;
1696             VarSymbol enumerator = null;
1697             for (Scope.Entry e = enumTypeSym.members().lookup(proxy.enumerator);
1698                  e.scope != null;
1699                  e = e.next()) {
1700                 if (e.sym.kind == VAR) {
1701                     enumerator = (VarSymbol)e.sym;
1702                     break;
1703                 }
1704             }
1705             if (enumerator == null) {
1706                 log.error("unknown.enum.constant",
1707                           currentClassFile, enumTypeSym, proxy.enumerator);
1708                 result = new Attribute.Error(enumTypeSym.type);
1709             } else {
1710                 result = new Attribute.Enum(enumTypeSym.type, enumerator);
1711             }
1712         }
1713 
1714         public void visitArrayAttributeProxy(ArrayAttributeProxy proxy) {
1715             int length = proxy.values.length();
1716             Attribute[] ats = new Attribute[length];
1717             Type elemtype = types.elemtype(type);
1718             int i = 0;
1719             for (List<Attribute> p = proxy.values; p.nonEmpty(); p = p.tail) {
1720                 ats[i++] = deproxy(elemtype, p.head);
1721             }
1722             result = new Attribute.Array(type, ats);
1723         }
1724 
1725         public void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy) {
1726             result = deproxyCompound(proxy);
1727         }
1728     }
1729 
1730     class AnnotationDefaultCompleter extends AnnotationDeproxy implements Annotate.Annotator {
1731         final MethodSymbol sym;
1732         final Attribute value;
1733         final JavaFileObject classFile = currentClassFile;
1734         @Override
1735         public String toString() {
1736             return " ClassReader store default for " + sym.owner + "." + sym + " is " + value;
1737         }
1738         AnnotationDefaultCompleter(MethodSymbol sym, Attribute value) {
1739             this.sym = sym;
1740             this.value = value;
1741         }
1742         // implement Annotate.Annotator.enterAnnotation()
1743         public void enterAnnotation() {
1744             JavaFileObject previousClassFile = currentClassFile;
1745             try {
1746                 currentClassFile = classFile;
1747                 sym.defaultValue = deproxy(sym.type.getReturnType(), value);
1748             } finally {
1749                 currentClassFile = previousClassFile;
1750             }
1751         }
1752     }
1753 
1754     class AnnotationCompleter extends AnnotationDeproxy implements Annotate.Annotator {
1755         final Symbol sym;
1756         final List<CompoundAnnotationProxy> l;
1757         final JavaFileObject classFile;
1758         @Override
1759         public String toString() {
1760             return " ClassReader annotate " + sym.owner + "." + sym + " with " + l;
1761         }
1762         AnnotationCompleter(Symbol sym, List<CompoundAnnotationProxy> l) {
1763             this.sym = sym;
1764             this.l = l;
1765             this.classFile = currentClassFile;
1766         }
1767         // implement Annotate.Annotator.enterAnnotation()
1768         public void enterAnnotation() {
1769             JavaFileObject previousClassFile = currentClassFile;
1770             try {
1771                 currentClassFile = classFile;
1772                 List<Attribute.Compound> newList = deproxyCompoundList(l);
1773                 sym.attributes_field = ((sym.attributes_field == null)
1774                                         ? newList
1775                                         : newList.prependList(sym.attributes_field));
1776             } finally {
1777                 currentClassFile = previousClassFile;
1778             }
1779         }
1780     }
1781 
1782     class TypeAnnotationCompleter extends AnnotationCompleter {
1783 
1784         List<TypeAnnotationProxy> proxies;
1785 
1786         TypeAnnotationCompleter(Symbol sym,
1787                 List<TypeAnnotationProxy> proxies) {
1788             super(sym, List.<CompoundAnnotationProxy>nil());
1789             this.proxies = proxies;
1790         }
1791 
1792         List<Attribute.TypeCompound> deproxyTypeCompoundList(List<TypeAnnotationProxy> proxies) {
1793             ListBuffer<Attribute.TypeCompound> buf = ListBuffer.lb();
1794             for (TypeAnnotationProxy proxy: proxies) {
1795                 Attribute.Compound compound = deproxyCompound(proxy.compound);
1796                 Attribute.TypeCompound typeCompound = new Attribute.TypeCompound(compound, proxy.position);
1797                 buf.add(typeCompound);
1798             }
1799             return buf.toList();
1800         }
1801 
1802         @Override
1803         public void enterAnnotation() {
1804             JavaFileObject previousClassFile = currentClassFile;
1805             try {
1806                 currentClassFile = classFile;
1807                 List<Attribute.TypeCompound> newList = deproxyTypeCompoundList(proxies);
1808               if (debugJSR308)
1809               System.out.println("TA: reading: adding " + newList
1810                       + " to symbol " + sym + " in " + log.currentSourceFile());
1811                 sym.typeAnnotations = ((sym.typeAnnotations == null)
1812                                         ? newList
1813                                         : newList.prependList(sym.typeAnnotations));
1814 
1815             } finally {
1816                 currentClassFile = previousClassFile;
1817             }
1818         }
1819     }
1820 
1821 
1822 /************************************************************************
1823  * Reading Symbols
1824  ***********************************************************************/
1825 
1826     /** Read a field.
1827      */
1828     VarSymbol readField() {
1829         long flags = adjustFieldFlags(nextChar());
1830         Name name = readName(nextChar());
1831         Type type = readType(nextChar());
1832         VarSymbol v = new VarSymbol(flags, name, type, currentOwner);
1833         readMemberAttrs(v);
1834         return v;
1835     }
1836 
1837     /** Read a method.
1838      */
1839     MethodSymbol readMethod() {
1840         long flags = adjustMethodFlags(nextChar());
1841         Name name = readName(nextChar());
1842         Type type = readType(nextChar());
1843         if (name == names.init && currentOwner.hasOuterInstance()) {
1844             // Sometimes anonymous classes don't have an outer
1845             // instance, however, there is no reliable way to tell so
1846             // we never strip this$n
1847             if (!currentOwner.name.isEmpty())
1848                 type = new MethodType(type.getParameterTypes().tail,
1849                                       type.getReturnType(),
1850                                       type.getThrownTypes(),
1851                                       syms.methodClass);
1852         }
1853         MethodSymbol m = new MethodSymbol(flags, name, type, currentOwner);
1854         if (saveParameterNames)
1855             initParameterNames(m);
1856         Symbol prevOwner = currentOwner;
1857         currentOwner = m;
1858         try {
1859             readMemberAttrs(m);
1860         } finally {
1861             currentOwner = prevOwner;
1862         }
1863         if (saveParameterNames)
1864             setParameterNames(m, type);
1865         return m;
1866     }
1867 
1868     /**
1869      * Init the parameter names array.
1870      * Parameter names are currently inferred from the names in the
1871      * LocalVariableTable attributes of a Code attribute.
1872      * (Note: this means parameter names are currently not available for
1873      * methods without a Code attribute.)
1874      * This method initializes an array in which to store the name indexes
1875      * of parameter names found in LocalVariableTable attributes. It is
1876      * slightly supersized to allow for additional slots with a start_pc of 0.
1877      */
1878     void initParameterNames(MethodSymbol sym) {
1879         // make allowance for synthetic parameters.
1880         final int excessSlots = 4;
1881         int expectedParameterSlots =
1882                 Code.width(sym.type.getParameterTypes()) + excessSlots;
1883         if (parameterNameIndices == null
1884                 || parameterNameIndices.length < expectedParameterSlots) {
1885             parameterNameIndices = new int[expectedParameterSlots];
1886         } else
1887             Arrays.fill(parameterNameIndices, 0);
1888         haveParameterNameIndices = false;
1889     }
1890 
1891     /**
1892      * Set the parameter names for a symbol from the name index in the
1893      * parameterNameIndicies array. The type of the symbol may have changed
1894      * while reading the method attributes (see the Signature attribute).
1895      * This may be because of generic information or because anonymous
1896      * synthetic parameters were added.   The original type (as read from
1897      * the method descriptor) is used to help guess the existence of
1898      * anonymous synthetic parameters.
1899      * On completion, sym.savedParameter names will either be null (if
1900      * no parameter names were found in the class file) or will be set to a
1901      * list of names, one per entry in sym.type.getParameterTypes, with
1902      * any missing names represented by the empty name.
1903      */
1904     void setParameterNames(MethodSymbol sym, Type jvmType) {
1905         // if no names were found in the class file, there's nothing more to do
1906         if (!haveParameterNameIndices)
1907             return;
1908 
1909         int firstParam = ((sym.flags() & STATIC) == 0) ? 1 : 0;
1910         // the code in readMethod may have skipped the first parameter when
1911         // setting up the MethodType. If so, we make a corresponding allowance
1912         // here for the position of the first parameter.  Note that this
1913         // assumes the skipped parameter has a width of 1 -- i.e. it is not
1914         // a double width type (long or double.)
1915         if (sym.name == names.init && currentOwner.hasOuterInstance()) {
1916             // Sometimes anonymous classes don't have an outer
1917             // instance, however, there is no reliable way to tell so
1918             // we never strip this$n
1919             if (!currentOwner.name.isEmpty())
1920                 firstParam += 1;
1921         }
1922 
1923         if (sym.type != jvmType) {
1924             // reading the method attributes has caused the symbol's type to
1925             // be changed. (i.e. the Signature attribute.)  This may happen if
1926             // there are hidden (synthetic) parameters in the descriptor, but
1927             // not in the Signature.  The position of these hidden parameters
1928             // is unspecified; for now, assume they are at the beginning, and
1929             // so skip over them. The primary case for this is two hidden
1930             // parameters passed into Enum constructors.
1931             int skip = Code.width(jvmType.getParameterTypes())
1932                     - Code.width(sym.type.getParameterTypes());
1933             firstParam += skip;
1934         }
1935         List<Name> paramNames = List.nil();
1936         int index = firstParam;
1937         for (Type t: sym.type.getParameterTypes()) {
1938             int nameIdx = (index < parameterNameIndices.length
1939                     ? parameterNameIndices[index] : 0);
1940             Name name = nameIdx == 0 ? names.empty : readName(nameIdx);
1941             paramNames = paramNames.prepend(name);
1942             index += Code.width(t);
1943         }
1944         sym.savedParameterNames = paramNames.reverse();
1945     }
1946 
1947     /** Skip a field or method
1948      */
1949     void skipMember() {
1950         bp = bp + 6;
1951         char ac = nextChar();
1952         for (int i = 0; i < ac; i++) {
1953             bp = bp + 2;
1954             int attrLen = nextInt();
1955             bp = bp + attrLen;
1956         }
1957     }
1958 
1959     /** Enter type variables of this classtype and all enclosing ones in
1960      *  `typevars'.
1961      */
1962     protected void enterTypevars(Type t) {
1963         if (t.getEnclosingType() != null && t.getEnclosingType().tag == CLASS)
1964             enterTypevars(t.getEnclosingType());
1965         for (List<Type> xs = t.getTypeArguments(); xs.nonEmpty(); xs = xs.tail)
1966             typevars.enter(xs.head.tsym);
1967     }
1968 
1969     protected void enterTypevars(Symbol sym) {
1970         if (sym.owner.kind == MTH) {
1971             enterTypevars(sym.owner);
1972             enterTypevars(sym.owner.owner);
1973         }
1974         enterTypevars(sym.type);
1975     }
1976 
1977     /** Read contents of a given class symbol `c'. Both external and internal
1978      *  versions of an inner class are read.
1979      */
1980     void readClass(ClassSymbol c) {
1981         ClassType ct = (ClassType)c.type;
1982 
1983         // allocate scope for members
1984         c.members_field = new Scope(c);
1985 
1986         // prepare type variable table
1987         typevars = typevars.dup(currentOwner);
1988         if (ct.getEnclosingType().tag == CLASS)
1989             enterTypevars(ct.getEnclosingType());
1990 
1991         // read flags, or skip if this is an inner class
1992         long flags = adjustClassFlags(nextChar());
1993         if (c.owner.kind == PCK) c.flags_field = flags;
1994 
1995         // read own class name and check that it matches
1996         ClassSymbol self = readClassSymbol(nextChar());
1997         if (c != self)
1998             throw badClassFile("class.file.wrong.class",
1999                                self.flatname);
2000 
2001         // class attributes must be read before class
2002         // skip ahead to read class attributes
2003         int startbp = bp;
2004         nextChar();
2005         char interfaceCount = nextChar();
2006         bp += interfaceCount * 2;
2007         char fieldCount = nextChar();
2008         for (int i = 0; i < fieldCount; i++) skipMember();
2009         char methodCount = nextChar();
2010         for (int i = 0; i < methodCount; i++) skipMember();
2011         readClassAttrs(c);
2012 
2013         if (readAllOfClassFile) {
2014             for (int i = 1; i < poolObj.length; i++) readPool(i);
2015             c.pool = new Pool(poolObj.length, poolObj);
2016         }
2017 
2018         // reset and read rest of classinfo
2019         bp = startbp;
2020         int n = nextChar();
2021         if (ct.supertype_field == null)
2022             ct.supertype_field = (n == 0)
2023                 ? Type.noType
2024                 : readClassSymbol(n).erasure(types);
2025         n = nextChar();
2026         List<Type> is = List.nil();
2027         for (int i = 0; i < n; i++) {
2028             Type _inter = readClassSymbol(nextChar()).erasure(types);
2029             is = is.prepend(_inter);
2030         }
2031         if (ct.interfaces_field == null)
2032             ct.interfaces_field = is.reverse();
2033 
2034         if (fieldCount != nextChar()) assert false;
2035         for (int i = 0; i < fieldCount; i++) enterMember(c, readField());
2036         if (methodCount != nextChar()) assert false;
2037         for (int i = 0; i < methodCount; i++) enterMember(c, readMethod());
2038 
2039         typevars = typevars.leave();
2040     }
2041 
2042     /** Read inner class info. For each inner/outer pair allocate a
2043      *  member class.
2044      */
2045     void readInnerClasses(ClassSymbol c) {
2046         int n = nextChar();
2047         for (int i = 0; i < n; i++) {
2048             nextChar(); // skip inner class symbol
2049             ClassSymbol outer = readClassSymbol(nextChar());
2050             Name name = readName(nextChar());
2051             if (name == null) name = names.empty;
2052             long flags = adjustClassFlags(nextChar());
2053             if (outer != null) { // we have a member class
2054                 if (name == names.empty)
2055                     name = names.one;
2056                 ClassSymbol member = enterClass(name, outer);
2057                 if ((flags & STATIC) == 0) {
2058                     ((ClassType)member.type).setEnclosingType(outer.type);
2059                     if (member.erasure_field != null)
2060                         ((ClassType)member.erasure_field).setEnclosingType(types.erasure(outer.type));
2061                 }
2062                 if (c == outer) {
2063                     member.flags_field = flags;
2064                     enterMember(c, member);
2065                 }
2066             }
2067         }
2068     }
2069 
2070     /** Read a class file.
2071      */
2072     private void readClassFile(ClassSymbol c) throws IOException {
2073         int magic = nextInt();
2074         if (magic != JAVA_MAGIC)
2075             throw badClassFile("illegal.start.of.class.file");
2076 
2077         minorVersion = nextChar();
2078         majorVersion = nextChar();
2079         int maxMajor = Target.MAX().majorVersion;
2080         int maxMinor = Target.MAX().minorVersion;
2081         if (majorVersion > maxMajor ||
2082             majorVersion * 1000 + minorVersion <
2083             Target.MIN().majorVersion * 1000 + Target.MIN().minorVersion)
2084         {
2085             if (majorVersion == (maxMajor + 1))
2086                 log.warning("big.major.version",
2087                             currentClassFile,
2088                             majorVersion,
2089                             maxMajor);
2090             else
2091                 throw badClassFile("wrong.version",
2092                                    Integer.toString(majorVersion),
2093                                    Integer.toString(minorVersion),
2094                                    Integer.toString(maxMajor),
2095                                    Integer.toString(maxMinor));
2096         }
2097         else if (checkClassFile &&
2098                  majorVersion == maxMajor &&
2099                  minorVersion > maxMinor)
2100         {
2101             printCCF("found.later.version",
2102                      Integer.toString(minorVersion));
2103         }
2104         indexPool();
2105         if (signatureBuffer.length < bp) {
2106             int ns = Integer.highestOneBit(bp) << 1;
2107             signatureBuffer = new byte[ns];
2108         }
2109         readClass(c);
2110     }
2111 
2112 /************************************************************************
2113  * Adjusting flags
2114  ***********************************************************************/
2115 
2116     long adjustFieldFlags(long flags) {
2117         return flags;
2118     }
2119     long adjustMethodFlags(long flags) {
2120         if ((flags & ACC_BRIDGE) != 0) {
2121             flags &= ~ACC_BRIDGE;
2122             flags |= BRIDGE;
2123             if (!allowGenerics)
2124                 flags &= ~SYNTHETIC;
2125         }
2126         if ((flags & ACC_VARARGS) != 0) {
2127             flags &= ~ACC_VARARGS;
2128             flags |= VARARGS;
2129         }
2130         return flags;
2131     }
2132     long adjustClassFlags(long flags) {
2133         return flags & ~ACC_SUPER; // SUPER and SYNCHRONIZED bits overloaded
2134     }
2135 
2136 /************************************************************************
2137  * Loading Classes
2138  ***********************************************************************/
2139 
2140     /** Define a new class given its name and owner.
2141      */
2142     public ClassSymbol defineClass(Name name, Symbol owner) {
2143         ClassSymbol c = new ClassSymbol(0, name, owner);
2144         if (owner.kind == PCK)
2145             assert classes.get(c.flatname) == null : c;
2146         c.completer = this;
2147         return c;
2148     }
2149 
2150     /** Create a new toplevel or member class symbol with given name
2151      *  and owner and enter in `classes' unless already there.
2152      */
2153     public ClassSymbol enterClass(Name name, TypeSymbol owner) {
2154         Name flatname = TypeSymbol.formFlatName(name, owner);
2155         ClassSymbol c = classes.get(flatname);
2156         if (c == null) {
2157             c = defineClass(name, owner);
2158             classes.put(flatname, c);
2159         } else if ((c.name != name || c.owner != owner) && owner.kind == TYP && c.owner.kind == PCK) {
2160             // reassign fields of classes that might have been loaded with
2161             // their flat names.
2162             c.owner.members().remove(c);
2163             c.name = name;
2164             c.owner = owner;
2165             c.fullname = ClassSymbol.formFullName(name, owner);
2166         }
2167         return c;
2168     }
2169 
2170     /**
2171      * Creates a new toplevel class symbol with given flat name and
2172      * given class (or source) file.
2173      *
2174      * @param flatName a fully qualified binary class name
2175      * @param classFile the class file or compilation unit defining
2176      * the class (may be {@code null})
2177      * @return a newly created class symbol
2178      * @throws AssertionError if the class symbol already exists
2179      */
2180     public ClassSymbol enterClass(Name flatName, JavaFileObject classFile) {
2181         ClassSymbol cs = classes.get(flatName);
2182         if (cs != null) {
2183             String msg = Log.format("%s: completer = %s; class file = %s; source file = %s",
2184                                     cs.fullname,
2185                                     cs.completer,
2186                                     cs.classfile,
2187                                     cs.sourcefile);
2188             throw new AssertionError(msg);
2189         }
2190         Name packageName = Convert.packagePart(flatName);
2191         PackageSymbol owner = packageName.isEmpty()
2192                                 ? syms.unnamedPackage
2193                                 : enterPackage(packageName);
2194         cs = defineClass(Convert.shortName(flatName), owner);
2195         cs.classfile = classFile;
2196         classes.put(flatName, cs);
2197         return cs;
2198     }
2199 
2200     /** Create a new member or toplevel class symbol with given flat name
2201      *  and enter in `classes' unless already there.
2202      */
2203     public ClassSymbol enterClass(Name flatname) {
2204         ClassSymbol c = classes.get(flatname);
2205         if (c == null)
2206             return enterClass(flatname, (JavaFileObject)null);
2207         else
2208             return c;
2209     }
2210 
2211     private boolean suppressFlush = false;
2212 
2213     /** Completion for classes to be loaded. Before a class is loaded
2214      *  we make sure its enclosing class (if any) is loaded.
2215      */
2216     public void complete(Symbol sym) throws CompletionFailure {
2217         if (sym.kind == TYP) {
2218             ClassSymbol c = (ClassSymbol)sym;
2219             c.members_field = new Scope.ErrorScope(c); // make sure it's always defined
2220             boolean saveSuppressFlush = suppressFlush;
2221             suppressFlush = true;
2222             try {
2223                 completeOwners(c.owner);
2224                 completeEnclosing(c);
2225             } finally {
2226                 suppressFlush = saveSuppressFlush;
2227             }
2228             fillIn(c);
2229         } else if (sym.kind == PCK) {
2230             PackageSymbol p = (PackageSymbol)sym;
2231             try {
2232                 fillIn(p);
2233             } catch (IOException ex) {
2234                 throw new CompletionFailure(sym, ex.getLocalizedMessage()).initCause(ex);
2235             }
2236         }
2237         if (!filling && !suppressFlush)
2238             annotate.flush(); // finish attaching annotations
2239     }
2240 
2241     /** complete up through the enclosing package. */
2242     private void completeOwners(Symbol o) {
2243         if (o.kind != PCK) completeOwners(o.owner);
2244         o.complete();
2245     }
2246 
2247     /**
2248      * Tries to complete lexically enclosing classes if c looks like a
2249      * nested class.  This is similar to completeOwners but handles
2250      * the situation when a nested class is accessed directly as it is
2251      * possible with the Tree API or javax.lang.model.*.
2252      */
2253     private void completeEnclosing(ClassSymbol c) {
2254         if (c.owner.kind == PCK) {
2255             Symbol owner = c.owner;
2256             for (Name name : Convert.enclosingCandidates(Convert.shortName(c.name))) {
2257                 Symbol encl = owner.members().lookup(name).sym;
2258                 if (encl == null)
2259                     encl = classes.get(TypeSymbol.formFlatName(name, owner));
2260                 if (encl != null)
2261                     encl.complete();
2262             }
2263         }
2264     }
2265 
2266     /** We can only read a single class file at a time; this
2267      *  flag keeps track of when we are currently reading a class
2268      *  file.
2269      */
2270     private boolean filling = false;
2271 
2272     /** Fill in definition of class `c' from corresponding class or
2273      *  source file.
2274      */
2275     private void fillIn(ClassSymbol c) {
2276         if (completionFailureName == c.fullname) {
2277             throw new CompletionFailure(c, "user-selected completion failure by class name");
2278         }
2279         currentOwner = c;
2280         JavaFileObject classfile = c.classfile;
2281         if (classfile != null) {
2282             JavaFileObject previousClassFile = currentClassFile;
2283             try {
2284                 assert !filling :
2285                     "Filling " + classfile.toUri() +
2286                     " during " + previousClassFile;
2287                 currentClassFile = classfile;
2288                 if (verbose) {
2289                     printVerbose("loading", currentClassFile.toString());
2290                 }
2291                 if (classfile.getKind() == JavaFileObject.Kind.CLASS) {
2292                     filling = true;
2293                     try {
2294                         bp = 0;
2295                         buf = readInputStream(buf, classfile.openInputStream());
2296                         readClassFile(c);
2297                         if (!missingTypeVariables.isEmpty() && !foundTypeVariables.isEmpty()) {
2298                             List<Type> missing = missingTypeVariables;
2299                             List<Type> found = foundTypeVariables;
2300                             missingTypeVariables = List.nil();
2301                             foundTypeVariables = List.nil();
2302                             filling = false;
2303                             ClassType ct = (ClassType)currentOwner.type;
2304                             ct.supertype_field =
2305                                 types.subst(ct.supertype_field, missing, found);
2306                             ct.interfaces_field =
2307                                 types.subst(ct.interfaces_field, missing, found);
2308                         } else if (missingTypeVariables.isEmpty() !=
2309                                    foundTypeVariables.isEmpty()) {
2310                             Name name = missingTypeVariables.head.tsym.name;
2311                             throw badClassFile("undecl.type.var", name);
2312                         }
2313                     } finally {
2314                         missingTypeVariables = List.nil();
2315                         foundTypeVariables = List.nil();
2316                         filling = false;
2317                     }
2318                 } else {
2319                     if (sourceCompleter != null) {
2320                         sourceCompleter.complete(c);
2321                     } else {
2322                         throw new IllegalStateException("Source completer required to read "
2323                                                         + classfile.toUri());
2324                     }
2325                 }
2326                 return;
2327             } catch (IOException ex) {
2328                 throw badClassFile("unable.to.access.file", ex.getMessage());
2329             } finally {
2330                 currentClassFile = previousClassFile;
2331             }
2332         } else {
2333             JCDiagnostic diag =
2334                 diagFactory.fragment("class.file.not.found", c.flatname);
2335             throw
2336                 newCompletionFailure(c, diag);
2337         }
2338     }
2339     // where
2340         private static byte[] readInputStream(byte[] buf, InputStream s) throws IOException {
2341             try {
2342                 buf = ensureCapacity(buf, s.available());
2343                 int r = s.read(buf);
2344                 int bp = 0;
2345                 while (r != -1) {
2346                     bp += r;
2347                     buf = ensureCapacity(buf, bp);
2348                     r = s.read(buf, bp, buf.length - bp);
2349                 }
2350                 return buf;
2351             } finally {
2352                 try {
2353                     s.close();
2354                 } catch (IOException e) {
2355                     /* Ignore any errors, as this stream may have already
2356                      * thrown a related exception which is the one that
2357                      * should be reported.
2358                      */
2359                 }
2360             }
2361         }
2362         private static byte[] ensureCapacity(byte[] buf, int needed) {
2363             if (buf.length < needed) {
2364                 byte[] old = buf;
2365                 buf = new byte[Integer.highestOneBit(needed) << 1];
2366                 System.arraycopy(old, 0, buf, 0, old.length);
2367             }
2368             return buf;
2369         }
2370         /** Static factory for CompletionFailure objects.
2371          *  In practice, only one can be used at a time, so we share one
2372          *  to reduce the expense of allocating new exception objects.
2373          */
2374         private CompletionFailure newCompletionFailure(TypeSymbol c,
2375                                                        JCDiagnostic diag) {
2376             if (!cacheCompletionFailure) {
2377                 // log.warning("proc.messager",
2378                 //             Log.getLocalizedString("class.file.not.found", c.flatname));
2379                 // c.debug.printStackTrace();
2380                 return new CompletionFailure(c, diag);
2381             } else {
2382                 CompletionFailure result = cachedCompletionFailure;
2383                 result.sym = c;
2384                 result.diag = diag;
2385                 return result;
2386             }
2387         }
2388         private CompletionFailure cachedCompletionFailure =
2389             new CompletionFailure(null, (JCDiagnostic) null);
2390         {
2391             cachedCompletionFailure.setStackTrace(new StackTraceElement[0]);
2392         }
2393 
2394     /** Load a toplevel class with given fully qualified name
2395      *  The class is entered into `classes' only if load was successful.
2396      */
2397     public ClassSymbol loadClass(Name flatname) throws CompletionFailure {
2398         boolean absent = classes.get(flatname) == null;
2399         ClassSymbol c = enterClass(flatname);
2400         if (c.members_field == null && c.completer != null) {
2401             try {
2402                 c.complete();
2403             } catch (CompletionFailure ex) {
2404                 if (absent) classes.remove(flatname);
2405                 throw ex;
2406             }
2407         }
2408         return c;
2409     }
2410 
2411 /************************************************************************
2412  * Loading Packages
2413  ***********************************************************************/
2414 
2415     /** Check to see if a package exists, given its fully qualified name.
2416      */
2417     public boolean packageExists(Name fullname) {
2418         return enterPackage(fullname).exists();
2419     }
2420 
2421     /** Make a package, given its fully qualified name.
2422      */
2423     public PackageSymbol enterPackage(Name fullname) {
2424         PackageSymbol p = packages.get(fullname);
2425         if (p == null) {
2426             assert !fullname.isEmpty() : "rootPackage missing!";
2427             p = new PackageSymbol(
2428                 Convert.shortName(fullname),
2429                 enterPackage(Convert.packagePart(fullname)));
2430             p.completer = this;
2431             packages.put(fullname, p);
2432         }
2433         return p;
2434     }
2435 
2436     /** Make a package, given its unqualified name and enclosing package.
2437      */
2438     public PackageSymbol enterPackage(Name name, PackageSymbol owner) {
2439         return enterPackage(TypeSymbol.formFullName(name, owner));
2440     }
2441 
2442     /** Include class corresponding to given class file in package,
2443      *  unless (1) we already have one the same kind (.class or .java), or
2444      *         (2) we have one of the other kind, and the given class file
2445      *             is older.
2446      */
2447     protected void includeClassFile(PackageSymbol p, JavaFileObject file) {
2448         if ((p.flags_field & EXISTS) == 0)
2449             for (Symbol q = p; q != null && q.kind == PCK; q = q.owner)
2450                 q.flags_field |= EXISTS;
2451         JavaFileObject.Kind kind = file.getKind();
2452         int seen;
2453         if (kind == JavaFileObject.Kind.CLASS)
2454             seen = CLASS_SEEN;
2455         else
2456             seen = SOURCE_SEEN;
2457         String binaryName = fileManager.inferBinaryName(currentLoc, file);
2458         int lastDot = binaryName.lastIndexOf(".");
2459         Name classname = names.fromString(binaryName.substring(lastDot + 1));
2460         boolean isPkgInfo = classname == names.package_info;
2461         ClassSymbol c = isPkgInfo
2462             ? p.package_info
2463             : (ClassSymbol) p.members_field.lookup(classname).sym;
2464         if (c == null) {
2465             c = enterClass(classname, p);
2466             if (c.classfile == null) // only update the file if's it's newly created
2467                 c.classfile = file;
2468             if (isPkgInfo) {
2469                 p.package_info = c;
2470             } else {
2471                 if (c.owner == p)  // it might be an inner class
2472                     p.members_field.enter(c);
2473             }
2474         } else if (c.classfile != null && (c.flags_field & seen) == 0) {
2475             // if c.classfile == null, we are currently compiling this class
2476             // and no further action is necessary.
2477             // if (c.flags_field & seen) != 0, we have already encountered
2478             // a file of the same kind; again no further action is necessary.
2479             if ((c.flags_field & (CLASS_SEEN | SOURCE_SEEN)) != 0)
2480                 c.classfile = preferredFileObject(file, c.classfile);
2481         }
2482         c.flags_field |= seen;
2483     }
2484 
2485     /** Implement policy to choose to derive information from a source
2486      *  file or a class file when both are present.  May be overridden
2487      *  by subclasses.
2488      */
2489     protected JavaFileObject preferredFileObject(JavaFileObject a,
2490                                            JavaFileObject b) {
2491 
2492         if (preferSource)
2493             return (a.getKind() == JavaFileObject.Kind.SOURCE) ? a : b;
2494         else {
2495             long adate = a.getLastModified();
2496             long bdate = b.getLastModified();
2497             // 6449326: policy for bad lastModifiedTime in ClassReader
2498             //assert adate >= 0 && bdate >= 0;
2499             return (adate > bdate) ? a : b;
2500         }
2501     }
2502 
2503     /**
2504      * specifies types of files to be read when filling in a package symbol
2505      */
2506     protected EnumSet<JavaFileObject.Kind> getPackageFileKinds() {
2507         return EnumSet.of(JavaFileObject.Kind.CLASS, JavaFileObject.Kind.SOURCE);
2508     }
2509 
2510     /**
2511      * this is used to support javadoc
2512      */
2513     protected void extraFileActions(PackageSymbol pack, JavaFileObject fe) {
2514     }
2515 
2516     protected Location currentLoc; // FIXME
2517 
2518     private boolean verbosePath = true;
2519 
2520     /** Load directory of package into members scope.
2521      */
2522     private void fillIn(PackageSymbol p) throws IOException {
2523         if (p.members_field == null) p.members_field = new Scope(p);
2524         String packageName = p.fullname.toString();
2525 
2526         Set<JavaFileObject.Kind> kinds = getPackageFileKinds();
2527 
2528         fillIn(p, PLATFORM_CLASS_PATH,
2529                fileManager.list(PLATFORM_CLASS_PATH,
2530                                 packageName,
2531                                 EnumSet.of(JavaFileObject.Kind.CLASS),
2532                                 false));
2533 
2534         Set<JavaFileObject.Kind> classKinds = EnumSet.copyOf(kinds);
2535         classKinds.remove(JavaFileObject.Kind.SOURCE);
2536         boolean wantClassFiles = !classKinds.isEmpty();
2537 
2538         Set<JavaFileObject.Kind> sourceKinds = EnumSet.copyOf(kinds);
2539         sourceKinds.remove(JavaFileObject.Kind.CLASS);
2540         boolean wantSourceFiles = !sourceKinds.isEmpty();
2541 
2542         boolean haveSourcePath = fileManager.hasLocation(SOURCE_PATH);
2543 
2544         if (verbose && verbosePath) {
2545             if (fileManager instanceof StandardJavaFileManager) {
2546                 StandardJavaFileManager fm = (StandardJavaFileManager)fileManager;
2547                 if (haveSourcePath && wantSourceFiles) {
2548                     List<File> path = List.nil();
2549                     for (File file : fm.getLocation(SOURCE_PATH)) {
2550                         path = path.prepend(file);
2551                     }
2552                     printVerbose("sourcepath", path.reverse().toString());
2553                 } else if (wantSourceFiles) {
2554                     List<File> path = List.nil();
2555                     for (File file : fm.getLocation(CLASS_PATH)) {
2556                         path = path.prepend(file);
2557                     }
2558                     printVerbose("sourcepath", path.reverse().toString());
2559                 }
2560                 if (wantClassFiles) {
2561                     List<File> path = List.nil();
2562                     for (File file : fm.getLocation(PLATFORM_CLASS_PATH)) {
2563                         path = path.prepend(file);
2564                     }
2565                     for (File file : fm.getLocation(CLASS_PATH)) {
2566                         path = path.prepend(file);
2567                     }
2568                     printVerbose("classpath",  path.reverse().toString());
2569                 }
2570             }
2571         }
2572 
2573         if (wantSourceFiles && !haveSourcePath) {
2574             fillIn(p, CLASS_PATH,
2575                    fileManager.list(CLASS_PATH,
2576                                     packageName,
2577                                     kinds,
2578                                     false));
2579         } else {
2580             if (wantClassFiles)
2581                 fillIn(p, CLASS_PATH,
2582                        fileManager.list(CLASS_PATH,
2583                                         packageName,
2584                                         classKinds,
2585                                         false));
2586             if (wantSourceFiles)
2587                 fillIn(p, SOURCE_PATH,
2588                        fileManager.list(SOURCE_PATH,
2589                                         packageName,
2590                                         sourceKinds,
2591                                         false));
2592         }
2593         verbosePath = false;
2594     }
2595     // where
2596         private void fillIn(PackageSymbol p,
2597                             Location location,
2598                             Iterable<JavaFileObject> files)
2599         {
2600             currentLoc = location;
2601             for (JavaFileObject fo : files) {
2602                 switch (fo.getKind()) {
2603                 case CLASS:
2604                 case SOURCE: {
2605                     // TODO pass binaryName to includeClassFile
2606                     String binaryName = fileManager.inferBinaryName(currentLoc, fo);
2607                     String simpleName = binaryName.substring(binaryName.lastIndexOf(".") + 1);
2608                     if (SourceVersion.isIdentifier(simpleName) ||
2609                         fo.getKind() == JavaFileObject.Kind.CLASS ||
2610                         simpleName.equals("package-info"))
2611                         includeClassFile(p, fo);
2612                     break;
2613                 }
2614                 default:
2615                     extraFileActions(p, fo);
2616                 }
2617             }
2618         }
2619 
2620     /** Output for "-verbose" option.
2621      *  @param key The key to look up the correct internationalized string.
2622      *  @param arg An argument for substitution into the output string.
2623      */
2624     private void printVerbose(String key, CharSequence arg) {
2625         Log.printLines(log.noticeWriter, Log.getLocalizedString("verbose." + key, arg));
2626     }
2627 
2628     /** Output for "-checkclassfile" option.
2629      *  @param key The key to look up the correct internationalized string.
2630      *  @param arg An argument for substitution into the output string.
2631      */
2632     private void printCCF(String key, Object arg) {
2633         Log.printLines(log.noticeWriter, Log.getLocalizedString(key, arg));
2634     }
2635 
2636 
2637     public interface SourceCompleter {
2638         void complete(ClassSymbol sym)
2639             throws CompletionFailure;
2640     }
2641 
2642     /**
2643      * A subclass of JavaFileObject for the sourcefile attribute found in a classfile.
2644      * The attribute is only the last component of the original filename, so is unlikely
2645      * to be valid as is, so operations other than those to access the name throw
2646      * UnsupportedOperationException
2647      */
2648     private static class SourceFileObject extends BaseFileObject {
2649 
2650         /** The file's name.
2651          */
2652         private Name name;
2653         private Name flatname;
2654 
2655         public SourceFileObject(Name name, Name flatname) {
2656             super(null); // no file manager; never referenced for this file object
2657             this.name = name;
2658             this.flatname = flatname;
2659         }
2660 
2661         @Override
2662         public URI toUri() {
2663             try {
2664                 return new URI(null, name.toString(), null);
2665             } catch (URISyntaxException e) {
2666                 throw new CannotCreateUriError(name.toString(), e);
2667             }
2668         }
2669 
2670         @Override
2671         public String getName() {
2672             return name.toString();
2673         }
2674 
2675         @Override
2676         public String getShortName() {
2677             return getName();
2678         }
2679 
2680         @Override
2681         public JavaFileObject.Kind getKind() {
2682             return getKind(getName());
2683         }
2684 
2685         @Override
2686         public InputStream openInputStream() {
2687             throw new UnsupportedOperationException();
2688         }
2689 
2690         @Override
2691         public OutputStream openOutputStream() {
2692             throw new UnsupportedOperationException();
2693         }
2694 
2695         @Override
2696         public CharBuffer getCharContent(boolean ignoreEncodingErrors) {
2697             throw new UnsupportedOperationException();
2698         }
2699 
2700         @Override
2701         public Reader openReader(boolean ignoreEncodingErrors) {
2702             throw new UnsupportedOperationException();
2703         }
2704 
2705         @Override
2706         public Writer openWriter() {
2707             throw new UnsupportedOperationException();
2708         }
2709 
2710         @Override
2711         public long getLastModified() {
2712             throw new UnsupportedOperationException();
2713         }
2714 
2715         @Override
2716         public boolean delete() {
2717             throw new UnsupportedOperationException();
2718         }
2719 
2720         @Override
2721         protected String inferBinaryName(Iterable<? extends File> path) {
2722             return flatname.toString();
2723         }
2724 
2725         @Override
2726         public boolean isNameCompatible(String simpleName, JavaFileObject.Kind kind) {
2727             return true; // fail-safe mode
2728         }
2729 
2730         /**
2731          * Check if two file objects are equal.
2732          * SourceFileObjects are just placeholder objects for the value of a
2733          * SourceFile attribute, and do not directly represent specific files.
2734          * Two SourceFileObjects are equal if their names are equal.
2735          */
2736         @Override
2737         public boolean equals(Object other) {
2738             if (this == other)
2739                 return true;
2740 
2741             if (!(other instanceof SourceFileObject))
2742                 return false;
2743 
2744             SourceFileObject o = (SourceFileObject) other;
2745             return name.equals(o.name);
2746         }
2747 
2748         @Override
2749         public int hashCode() {
2750             return name.hashCode();
2751         }
2752     }
2753 }