net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/lookup/ClassScope.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v0.5
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v05.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  ******************************************************************************/
  11 package net.sourceforge.phpdt.internal.compiler.lookup;
  12
  13 import net.sourceforge.phpdt.internal.compiler.ast.AbstractMethodDeclaration;
  14 import net.sourceforge.phpdt.internal.compiler.ast.Clinit;
  15 import net.sourceforge.phpdt.internal.compiler.ast.FieldDeclaration;
  16 import net.sourceforge.phpdt.internal.compiler.ast.TypeDeclaration;
  17 import net.sourceforge.phpdt.internal.compiler.ast.TypeReference;
  18 import net.sourceforge.phpdt.internal.compiler.impl.ReferenceContext;
  19 import net.sourceforge.phpdt.internal.compiler.problem.ProblemReporter;
  20 import net.sourceforge.phpdt.internal.compiler.util.CharOperation;
  21 import net.sourceforge.phpdt.internal.compiler.util.HashtableOfObject;
  22
  23 public class ClassScope extends Scope {
  24         public TypeDeclaration referenceContext;
  25
  26         public ClassScope(Scope parent, TypeDeclaration context) {
  27                 super(CLASS_SCOPE, parent);
  28                 this.referenceContext = context;
  29         }
  30
  31         void buildAnonymousTypeBinding(SourceTypeBinding enclosingType, ReferenceBinding supertype) {
  32
  33                 LocalTypeBinding anonymousType = buildLocalType(enclosingType, enclosingType.fPackage);
  34
  35                 SourceTypeBinding sourceType = referenceContext.binding;
  36                 if (supertype.isInterface()) {
  37                         sourceType.superclass = getJavaLangObject();
  38                         sourceType.superInterfaces = new ReferenceBinding[] { supertype };
  39                 } else {
  40                         sourceType.superclass = supertype;
  41                         sourceType.superInterfaces = TypeBinding.NoSuperInterfaces;
  42                 }
  43                 connectMemberTypes();
  44                 buildFieldsAndMethods();
  45                 anonymousType.faultInTypesForFieldsAndMethods();
  46                 sourceType.verifyMethods(environment().methodVerifier());
  47         }
  48
  49         private void buildFields() {
  50                 if (referenceContext.fields == null) {
  51                         referenceContext.binding.fields = NoFields;
  52                         return;
  53                 }
  54                 // count the number of fields vs. initializers
  55                 FieldDeclaration[] fields = referenceContext.fields;
  56                 int size = fields.length;
  57                 int count = 0;
  58                 for (int i = 0; i < size; i++)
  59                         if (fields[i].isField())
  60                                 count++;
  61
  62                 // iterate the field declarations to create the bindings, lose all duplicates
  63                 FieldBinding[] fieldBindings = new FieldBinding[count];
  64                 HashtableOfObject knownFieldNames = new HashtableOfObject(count);
  65                 boolean duplicate = false;
  66                 count = 0;
  67                 for (int i = 0; i < size; i++) {
  68                         FieldDeclaration field = fields[i];
  69                         if (!field.isField()) {
  70                                 if (referenceContext.binding.isInterface())
  71                                         problemReporter().interfaceCannotHaveInitializers(referenceContext.binding, field);
  72                         } else {
  73                                 FieldBinding fieldBinding = new FieldBinding(field, null, referenceContext.binding);
  74                                 // field's type will be resolved when needed for top level types
  75                                 checkAndSetModifiersForField(fieldBinding, field);
  76
  77                                 if (knownFieldNames.containsKey(field.name)) {
  78                                         duplicate = true;
  79                                         FieldBinding previousBinding = (FieldBinding) knownFieldNames.get(field.name);
  80                                         if (previousBinding != null) {
  81                                                 for (int f = 0; f < i; f++) {
  82                                                         FieldDeclaration previousField = fields[f];
  83                                                         if (previousField.binding == previousBinding) {
  84                                                                 problemReporter().duplicateFieldInType(referenceContext.binding, previousField);
  85                                                                 previousField.binding = null;
  86                                                                 break;
  87                                                         }
  88                                                 }
  89                                         }
  90                                         knownFieldNames.put(field.name, null); // ensure that the duplicate field is found & removed
  91                                         problemReporter().duplicateFieldInType(referenceContext.binding, field);
  92                                         field.binding = null;
  93                                 } else {
  94                                         knownFieldNames.put(field.name, fieldBinding);
  95                                         // remember that we have seen a field with this name
  96                                         if (fieldBinding != null)
  97                                                 fieldBindings[count++] = fieldBinding;
  98                                 }
  99                         }
 100                 }
 101                 // remove duplicate fields
 102                 if (duplicate) {
 103                         FieldBinding[] newFieldBindings = new FieldBinding[knownFieldNames.size() - 1];
 104                         // we know we'll be removing at least 1 duplicate name
 105                         size = count;
 106                         count = 0;
 107                         for (int i = 0; i < size; i++) {
 108                                 FieldBinding fieldBinding = fieldBindings[i];
 109                                 if (knownFieldNames.get(fieldBinding.name) != null)
 110                                         newFieldBindings[count++] = fieldBinding;
 111                         }
 112                         fieldBindings = newFieldBindings;
 113                 }
 114
 115                 if (count != fieldBindings.length)
 116                         System.arraycopy(fieldBindings, 0, fieldBindings = new FieldBinding[count], 0, count);
 117                 for (int i = 0; i < count; i++)
 118                         fieldBindings[i].id = i;
 119                 referenceContext.binding.fields = fieldBindings;
 120         }
 121
 122         void buildFieldsAndMethods() {
 123                 buildFields();
 124                 buildMethods();
 125
 126                 SourceTypeBinding sourceType = referenceContext.binding;
 127                 if (sourceType.isMemberType() && !sourceType.isLocalType())
 128                          ((MemberTypeBinding) sourceType).checkSyntheticArgsAndFields();
 129
 130                 ReferenceBinding[] memberTypes = sourceType.memberTypes;
 131                 for (int i = 0, length = memberTypes.length; i < length; i++)
 132                          ((SourceTypeBinding) memberTypes[i]).scope.buildFieldsAndMethods();
 133         }
 134
 135         private LocalTypeBinding buildLocalType(
 136                 SourceTypeBinding enclosingType,
 137                 PackageBinding packageBinding) {
 138                 referenceContext.scope = this;
 139                 referenceContext.staticInitializerScope = new MethodScope(this, referenceContext, true);
 140                 referenceContext.initializerScope = new MethodScope(this, referenceContext, false);
 141
 142                 // build the binding or the local type
 143                 LocalTypeBinding localType = new LocalTypeBinding(this, enclosingType);
 144                 referenceContext.binding = localType;
 145                 checkAndSetModifiers();
 146
 147                 // Look at member types
 148                 ReferenceBinding[] memberTypeBindings = NoMemberTypes;
 149                 if (referenceContext.memberTypes != null) {
 150                         int size = referenceContext.memberTypes.length;
 151                         memberTypeBindings = new ReferenceBinding[size];
 152                         int count = 0;
 153                         nextMember : for (int i = 0; i < size; i++) {
 154                                 TypeDeclaration memberContext = referenceContext.memberTypes[i];
 155                                 if (memberContext.isInterface()) {
 156                                         problemReporter().nestedClassCannotDeclareInterface(memberContext);
 157                                         continue nextMember;
 158                                 }
 159                                 ReferenceBinding type = localType;
 160                                 // check that the member does not conflict with an enclosing type
 161                                 do {
 162                                         if (CharOperation.equals(type.sourceName, memberContext.name)) {
 163                                                 problemReporter().hidingEnclosingType(memberContext);
 164                                                 continue nextMember;
 165                                         }
 166                                         type = type.enclosingType();
 167                                 } while (type != null);
 168                                 // check the member type does not conflict with another sibling member type
 169                                 for (int j = 0; j < i; j++) {
 170                                         if (CharOperation.equals(referenceContext.memberTypes[j].name, memberContext.name)) {
 171                                                 problemReporter().duplicateNestedType(memberContext);
 172                                                 continue nextMember;
 173                                         }
 174                                 }
 175
 176                                 ClassScope memberScope = new ClassScope(this, referenceContext.memberTypes[i]);
 177                                 LocalTypeBinding memberBinding = memberScope.buildLocalType(localType, packageBinding);
 178                                 memberBinding.setAsMemberType();
 179                                 memberTypeBindings[count++] = memberBinding;
 180                         }
 181                         if (count != size)
 182                                 System.arraycopy(memberTypeBindings, 0, memberTypeBindings = new ReferenceBinding[count], 0, count);
 183                 }
 184                 localType.memberTypes = memberTypeBindings;
 185                 return localType;
 186         }
 187
 188         void buildLocalTypeBinding(SourceTypeBinding enclosingType) {
 189
 190                 LocalTypeBinding localType = buildLocalType(enclosingType, enclosingType.fPackage);
 191                 connectTypeHierarchy();
 192                 buildFieldsAndMethods();
 193                 localType.faultInTypesForFieldsAndMethods();
 194
 195                 referenceContext.binding.verifyMethods(environment().methodVerifier());
 196         }
 197
 198         private void buildMethods() {
 199                 if (referenceContext.methods == null) {
 200                         referenceContext.binding.methods = NoMethods;
 201                         return;
 202                 }
 203
 204                 // iterate the method declarations to create the bindings
 205                 AbstractMethodDeclaration[] methods = referenceContext.methods;
 206                 int size = methods.length;
 207                 int clinitIndex = -1;
 208                 for (int i = 0; i < size; i++) {
 209                         if (methods[i] instanceof Clinit) {
 210                                 clinitIndex = i;
 211                                 break;
 212                         }
 213                 }
 214                 MethodBinding[] methodBindings = new MethodBinding[clinitIndex == -1 ? size : size - 1];
 215
 216                 int count = 0;
 217                 for (int i = 0; i < size; i++) {
 218                         if (i != clinitIndex) {
 219                                 MethodScope scope = new MethodScope(this, methods[i], false);
 220                                 MethodBinding methodBinding = scope.createMethod(methods[i]);
 221                                 if (methodBinding != null) // is null if binding could not be created
 222                                         methodBindings[count++] = methodBinding;
 223                         }
 224                 }
 225                 if (count != methodBindings.length)
 226                         System.arraycopy(methodBindings, 0, methodBindings = new MethodBinding[count], 0, count);
 227
 228                 referenceContext.binding.methods = methodBindings;
 229                 referenceContext.binding.modifiers |= AccUnresolved; // until methods() is sent
 230         }
 231         SourceTypeBinding buildType(SourceTypeBinding enclosingType, PackageBinding packageBinding) {
 232                 // provide the typeDeclaration with needed scopes
 233                 referenceContext.scope = this;
 234                 referenceContext.staticInitializerScope = new MethodScope(this, referenceContext, true);
 235                 referenceContext.initializerScope = new MethodScope(this, referenceContext, false);
 236
 237                 if (enclosingType == null) {
 238                         char[][] className = CharOperation.arrayConcat(packageBinding.compoundName, referenceContext.name);
 239                         referenceContext.binding = new SourceTypeBinding(className, packageBinding, this);
 240                 } else {
 241                         char[][] className = CharOperation.deepCopy(enclosingType.compoundName);
 242                         className[className.length - 1] =
 243                                 CharOperation.concat(className[className.length - 1], referenceContext.name, '$');
 244                         referenceContext.binding = new MemberTypeBinding(className, this, enclosingType);
 245                 }
 246
 247                 SourceTypeBinding sourceType = referenceContext.binding;
 248                 sourceType.fPackage.addType(sourceType);
 249                 checkAndSetModifiers();
 250
 251                 // Look at member types
 252                 ReferenceBinding[] memberTypeBindings = NoMemberTypes;
 253                 if (referenceContext.memberTypes != null) {
 254                         int size = referenceContext.memberTypes.length;
 255                         memberTypeBindings = new ReferenceBinding[size];
 256                         int count = 0;
 257                         nextMember : for (int i = 0; i < size; i++) {
 258                                 TypeDeclaration memberContext = referenceContext.memberTypes[i];
 259                                 if (memberContext.isInterface()
 260                                         && sourceType.isNestedType()
 261                                         && sourceType.isClass()
 262                                         && !sourceType.isStatic()) {
 263                                         problemReporter().nestedClassCannotDeclareInterface(memberContext);
 264                                         continue nextMember;
 265                                 }
 266                                 ReferenceBinding type = sourceType;
 267                                 // check that the member does not conflict with an enclosing type
 268                                 do {
 269                                         if (CharOperation.equals(type.sourceName, memberContext.name)) {
 270                                                 problemReporter().hidingEnclosingType(memberContext);
 271                                                 continue nextMember;
 272                                         }
 273                                         type = type.enclosingType();
 274                                 } while (type != null);
 275                                 // check that the member type does not conflict with another sibling member type
 276                                 for (int j = 0; j < i; j++) {
 277                                         if (CharOperation.equals(referenceContext.memberTypes[j].name, memberContext.name)) {
 278                                                 problemReporter().duplicateNestedType(memberContext);
 279                                                 continue nextMember;
 280                                         }
 281                                 }
 282
 283                                 ClassScope memberScope = new ClassScope(this, memberContext);
 284                                 memberTypeBindings[count++] = memberScope.buildType(sourceType, packageBinding);
 285                         }
 286                         if (count != size)
 287                                 System.arraycopy(memberTypeBindings, 0, memberTypeBindings = new ReferenceBinding[count], 0, count);
 288                 }
 289                 sourceType.memberTypes = memberTypeBindings;
 290                 return sourceType;
 291         }
 292
 293         private void checkAndSetModifiers() {
 294                 SourceTypeBinding sourceType = referenceContext.binding;
 295                 int modifiers = sourceType.modifiers;
 296                 if ((modifiers & AccAlternateModifierProblem) != 0)
 297                         problemReporter().duplicateModifierForType(sourceType);
 298
 299                 ReferenceBinding enclosingType = sourceType.enclosingType();
 300                 boolean isMemberType = sourceType.isMemberType();
 301
 302                 if (isMemberType) {
 303                         // checks for member types before local types to catch local members
 304                         if (enclosingType.isStrictfp())
 305                                 modifiers |= AccStrictfp;
 306                         if (enclosingType.isDeprecated())
 307                                 modifiers |= AccDeprecatedImplicitly;
 308                         if (enclosingType.isInterface())
 309                                 modifiers |= AccPublic;
 310                 } else if (sourceType.isLocalType()) {
 311                         if (sourceType.isAnonymousType())
 312                                 modifiers |= AccFinal;
 313                         ReferenceContext refContext = methodScope().referenceContext;
 314                         if (refContext instanceof TypeDeclaration) {
 315                                 ReferenceBinding type = ((TypeDeclaration) refContext).binding;
 316                                 if (type.isStrictfp())
 317                                         modifiers |= AccStrictfp;
 318                                 if (type.isDeprecated())
 319                                         modifiers |= AccDeprecatedImplicitly;
 320                         } else {
 321                                 MethodBinding method = ((AbstractMethodDeclaration) refContext).binding;
 322                                 if (method != null){
 323                                         if (method.isStrictfp())
 324                                                 modifiers |= AccStrictfp;
 325                                         if (method.isDeprecated())
 326                                                 modifiers |= AccDeprecatedImplicitly;
 327                                 }
 328                         }
 329                 }
 330                 // after this point, tests on the 16 bits reserved.
 331                 int realModifiers = modifiers & AccJustFlag;
 332
 333                 if ((realModifiers & AccInterface) != 0) {
 334                         // detect abnormal cases for interfaces
 335                         if (isMemberType) {
 336                                 int unexpectedModifiers =
 337                                         ~(AccPublic | AccPrivate | AccProtected | AccStatic | AccAbstract | AccInterface | AccStrictfp);
 338                                 if ((realModifiers & unexpectedModifiers) != 0)
 339                                         problemReporter().illegalModifierForMemberInterface(sourceType);
 340                                 /*
 341                                 } else if (sourceType.isLocalType()) { //interfaces cannot be defined inside a method
 342                                         int unexpectedModifiers = ~(AccAbstract | AccInterface | AccStrictfp);
 343                                         if ((realModifiers & unexpectedModifiers) != 0)
 344                                                 problemReporter().illegalModifierForLocalInterface(sourceType);
 345                                 */
 346                         } else {
 347                                 int unexpectedModifiers = ~(AccPublic | AccAbstract | AccInterface | AccStrictfp);
 348                                 if ((realModifiers & unexpectedModifiers) != 0)
 349                                         problemReporter().illegalModifierForInterface(sourceType);
 350                         }
 351                         modifiers |= AccAbstract;
 352                 } else {
 353                         // detect abnormal cases for types
 354                         if (isMemberType) { // includes member types defined inside local types
 355                                 int unexpectedModifiers =
 356                                         ~(AccPublic | AccPrivate | AccProtected | AccStatic | AccAbstract | AccFinal | AccStrictfp);
 357                                 if ((realModifiers & unexpectedModifiers) != 0)
 358                                         problemReporter().illegalModifierForMemberClass(sourceType);
 359                         } else if (sourceType.isLocalType()) {
 360                                 int unexpectedModifiers = ~(AccAbstract | AccFinal | AccStrictfp);
 361                                 if ((realModifiers & unexpectedModifiers) != 0)
 362                                         problemReporter().illegalModifierForLocalClass(sourceType);
 363                         } else {
 364                                 int unexpectedModifiers = ~(AccPublic | AccAbstract | AccFinal | AccStrictfp);
 365                                 if ((realModifiers & unexpectedModifiers) != 0)
 366                                         problemReporter().illegalModifierForClass(sourceType);
 367                         }
 368
 369                         // check that Final and Abstract are not set together
 370                         if ((realModifiers & (AccFinal | AccAbstract)) == (AccFinal | AccAbstract))
 371                                 problemReporter().illegalModifierCombinationFinalAbstractForClass(sourceType);
 372                 }
 373
 374                 if (isMemberType) {
 375                         // test visibility modifiers inconsistency, isolate the accessors bits
 376                         if (enclosingType.isInterface()) {
 377                                 if ((realModifiers & (AccProtected | AccPrivate)) != 0) {
 378                                         problemReporter().illegalVisibilityModifierForInterfaceMemberType(sourceType);
 379
 380                                         // need to keep the less restrictive
 381                                         if ((realModifiers & AccProtected) != 0)
 382                                                 modifiers ^= AccProtected;
 383                                         if ((realModifiers & AccPrivate) != 0)
 384                                                 modifiers ^= AccPrivate;
 385                                 }
 386                         } else {
 387                                 int accessorBits = realModifiers & (AccPublic | AccProtected | AccPrivate);
 388                                 if ((accessorBits & (accessorBits - 1)) > 1) {
 389                                         problemReporter().illegalVisibilityModifierCombinationForMemberType(sourceType);
 390
 391                                         // need to keep the less restrictive
 392                                         if ((accessorBits & AccPublic) != 0) {
 393                                                 if ((accessorBits & AccProtected) != 0)
 394                                                         modifiers ^= AccProtected;
 395                                                 if ((accessorBits & AccPrivate) != 0)
 396                                                         modifiers ^= AccPrivate;
 397                                         }
 398                                         if ((accessorBits & AccProtected) != 0)
 399                                                 if ((accessorBits & AccPrivate) != 0)
 400                                                         modifiers ^= AccPrivate;
 401                                 }
 402                         }
 403
 404                         // static modifier test
 405                         if ((realModifiers & AccStatic) == 0) {
 406                                 if (enclosingType.isInterface())
 407                                         modifiers |= AccStatic;
 408                         } else {
 409                                 if (!enclosingType.isStatic())
 410                                         // error the enclosing type of a static field must be static or a top-level type
 411                                         problemReporter().illegalStaticModifierForMemberType(sourceType);
 412                         }
 413                 }
 414
 415                 sourceType.modifiers = modifiers;
 416         }
 417
 418         /* This method checks the modifiers of a field.
 419         *
 420         * 9.3 & 8.3
 421         * Need to integrate the check for the final modifiers for nested types
 422         *
 423         * Note : A scope is accessible by : fieldBinding.declaringClass.scope
 424         */
 425         private void checkAndSetModifiersForField(FieldBinding fieldBinding, FieldDeclaration fieldDecl) {
 426                 int modifiers = fieldBinding.modifiers;
 427                 if ((modifiers & AccAlternateModifierProblem) != 0)
 428                         problemReporter().duplicateModifierForField(fieldBinding.declaringClass, fieldDecl);
 429
 430                 if (fieldBinding.declaringClass.isInterface()) {
 431                         int expectedValue = AccPublic | AccStatic | AccFinal;
 432                         // set the modifiers
 433                         modifiers |= expectedValue;
 434
 435                         // and then check that they are the only ones
 436                         if ((modifiers & AccJustFlag) != expectedValue)
 437                                 problemReporter().illegalModifierForInterfaceField(fieldBinding.declaringClass, fieldDecl);
 438                         fieldBinding.modifiers = modifiers;
 439                         return;
 440                 }
 441
 442                 // after this point, tests on the 16 bits reserved.
 443                 int realModifiers = modifiers & AccJustFlag;
 444                 int unexpectedModifiers =
 445                         ~(AccPublic | AccPrivate | AccProtected | AccFinal | AccStatic | AccTransient | AccVolatile);
 446                 if ((realModifiers & unexpectedModifiers) != 0)
 447                         problemReporter().illegalModifierForField(fieldBinding.declaringClass, fieldDecl);
 448
 449                 int accessorBits = realModifiers & (AccPublic | AccProtected | AccPrivate);
 450                 if ((accessorBits & (accessorBits - 1)) > 1) {
 451                         problemReporter().illegalVisibilityModifierCombinationForField(
 452                                 fieldBinding.declaringClass,
 453                                 fieldDecl);
 454
 455                         // need to keep the less restrictive
 456                         if ((accessorBits & AccPublic) != 0) {
 457                                 if ((accessorBits & AccProtected) != 0)
 458                                         modifiers ^= AccProtected;
 459                                 if ((accessorBits & AccPrivate) != 0)
 460                                         modifiers ^= AccPrivate;
 461                         }
 462                         if ((accessorBits & AccProtected) != 0)
 463                                 if ((accessorBits & AccPrivate) != 0)
 464                                         modifiers ^= AccPrivate;
 465                 }
 466
 467                 if ((realModifiers & (AccFinal | AccVolatile)) == (AccFinal | AccVolatile))
 468                         problemReporter().illegalModifierCombinationFinalVolatileForField(
 469                                 fieldBinding.declaringClass,
 470                                 fieldDecl);
 471
 472                 fieldBinding.modifiers = modifiers;
 473         }
 474
 475         private void checkForInheritedMemberTypes(SourceTypeBinding sourceType) {
 476                 // search up the hierarchy of the sourceType to see if any superType defines a member type
 477                 // when no member types are defined, tag the sourceType & each superType with the HasNoMemberTypes bit
 478                 ReferenceBinding currentType = sourceType;
 479                 ReferenceBinding[][] interfacesToVisit = null;
 480                 int lastPosition = -1;
 481                 do {
 482                         if ((currentType.tagBits & HasNoMemberTypes) != 0)
 483                                 break; // already know it has no inherited member types, can stop looking up
 484                         if (currentType.memberTypes() != NoMemberTypes)
 485                                 return; // has member types
 486                         ReferenceBinding[] itsInterfaces = currentType.superInterfaces();
 487                         if (itsInterfaces != NoSuperInterfaces) {
 488                                 if (interfacesToVisit == null)
 489                                         interfacesToVisit = new ReferenceBinding[5][];
 490                                 if (++lastPosition == interfacesToVisit.length)
 491                                         System.arraycopy(
 492                                                 interfacesToVisit,
 493                                                 0,
 494                                                 interfacesToVisit = new ReferenceBinding[lastPosition * 2][],
 495                                                 0,
 496                                                 lastPosition);
 497                                 interfacesToVisit[lastPosition] = itsInterfaces;
 498                         }
 499                 } while ((currentType = currentType.superclass()) != null);
 500
 501                 boolean hasMembers = false;
 502                 if (interfacesToVisit != null) {
 503                         done : for (int i = 0; i <= lastPosition; i++) {
 504                                 ReferenceBinding[] interfaces = interfacesToVisit[i];
 505                                 for (int j = 0, length = interfaces.length; j < length; j++) {
 506                                         ReferenceBinding anInterface = interfaces[j];
 507                                         if ((anInterface.tagBits & InterfaceVisited) == 0) { // if interface as not already been visited
 508                                                 anInterface.tagBits |= InterfaceVisited;
 509                                                 if ((anInterface.tagBits & HasNoMemberTypes) != 0)
 510                                                         continue; // already know it has no inherited member types
 511                                                 if (anInterface.memberTypes() != NoMemberTypes) {
 512                                                         hasMembers = true;
 513                                                         break done;
 514                                                 }
 515
 516                                                 ReferenceBinding[] itsInterfaces = anInterface.superInterfaces();
 517                                                 if (itsInterfaces != NoSuperInterfaces) {
 518                                                         if (++lastPosition == interfacesToVisit.length)
 519                                                                 System.arraycopy(
 520                                                                         interfacesToVisit,
 521                                                                         0,
 522                                                                         interfacesToVisit = new ReferenceBinding[lastPosition * 2][],
 523                                                                         0,
 524                                                                         lastPosition);
 525                                                         interfacesToVisit[lastPosition] = itsInterfaces;
 526                                                 }
 527                                         }
 528                                 }
 529                         }
 530
 531                         for (int i = 0; i <= lastPosition; i++) {
 532                                 ReferenceBinding[] interfaces = interfacesToVisit[i];
 533                                 for (int j = 0, length = interfaces.length; j < length; j++) {
 534                                         interfaces[j].tagBits &= ~InterfaceVisited;
 535                                         if (!hasMembers)
 536                                                 interfaces[j].tagBits |= HasNoMemberTypes;
 537                                 }
 538                         }
 539                 }
 540
 541                 if (!hasMembers) {
 542                         currentType = sourceType;
 543                         do {
 544                                 currentType.tagBits |= HasNoMemberTypes;
 545                         } while ((currentType = currentType.superclass()) != null);
 546                 }
 547         }
 548
 549         private void connectMemberTypes() {
 550                 SourceTypeBinding sourceType = referenceContext.binding;
 551                 if (sourceType.memberTypes != NoMemberTypes)
 552                         for (int i = 0, size = sourceType.memberTypes.length; i < size; i++)
 553                                  ((SourceTypeBinding) sourceType.memberTypes[i]).scope.connectTypeHierarchy();
 554         }
 555         /*
 556                 Our current belief based on available JCK tests is:
 557                         inherited member types are visible as a potential superclass.
 558                         inherited interfaces are not visible when defining a superinterface.
 559
 560                 Error recovery story:
 561                         ensure the superclass is set to java.lang.Object if a problem is detected
 562                         resolving the superclass.
 563
 564                 Answer false if an error was reported against the sourceType.
 565         */
 566         private boolean connectSuperclass() {
 567                 SourceTypeBinding sourceType = referenceContext.binding;
 568                 if (referenceContext.superclass == null) {
 569                         if (isJavaLangObject(sourceType))
 570                                 return true;
 571                         sourceType.superclass = getJavaLangObject();
 572                         return !detectCycle(sourceType, sourceType.superclass, null);
 573                         // ensure Object is initialized if it comes from a source file
 574                 }
 575                 ReferenceBinding superclass = findSupertype(referenceContext.superclass);
 576                 if (superclass != null) { // is null if a cycle was detected cycle
 577                         if (!superclass.isValidBinding()) {
 578                                 problemReporter().invalidSuperclass(sourceType, referenceContext.superclass, superclass);
 579                         } else if (superclass.isInterface()) {
 580                                 problemReporter().superclassMustBeAClass(sourceType, referenceContext.superclass, superclass);
 581                         } else if (superclass.isFinal()) {
 582                                 problemReporter().classExtendFinalClass(sourceType, referenceContext.superclass, superclass);
 583                         } else if (isJavaLangObject(sourceType)) {
 584                                 // can only happen if Object extends another type... will never happen unless we're testing for it.
 585                                 sourceType.tagBits |= HierarchyHasProblems;
 586                                 sourceType.superclass = null;
 587                                 return true;
 588                         } else {
 589                                 // only want to reach here when no errors are reported
 590                                 referenceContext.superclass.binding = superclass;
 591                                 sourceType.superclass = superclass;
 592                                 return true;
 593                         }
 594                 }
 595                 sourceType.tagBits |= HierarchyHasProblems;
 596                 if (!isJavaLangObject(sourceType)) {
 597                         sourceType.superclass = getJavaLangObject();
 598                         if ((sourceType.superclass.tagBits & BeginHierarchyCheck) == 0)
 599                                 detectCycle(sourceType, sourceType.superclass, null);
 600                         // ensure Object is initialized if it comes from a source file
 601                 }
 602                 return false; // reported some error against the source type
 603         }
 604
 605         /*
 606                 Our current belief based on available JCK 1.3 tests is:
 607                         inherited member types are visible as a potential superclass.
 608                         inherited interfaces are visible when defining a superinterface.
 609
 610                 Error recovery story:
 611                         ensure the superinterfaces contain only valid visible interfaces.
 612
 613                 Answer false if an error was reported against the sourceType.
 614         */
 615         private boolean connectSuperInterfaces() {
 616                 SourceTypeBinding sourceType = referenceContext.binding;
 617                 sourceType.superInterfaces = NoSuperInterfaces;
 618                 if (referenceContext.superInterfaces == null)
 619                         return true;
 620
 621                 boolean noProblems = true;
 622                 int length = referenceContext.superInterfaces.length;
 623                 ReferenceBinding[] interfaceBindings = new ReferenceBinding[length];
 624                 int count = 0;
 625                 nextInterface : for (int i = 0; i < length; i++) {
 626                         ReferenceBinding superInterface = findSupertype(referenceContext.superInterfaces[i]);
 627                         if (superInterface == null) { // detected cycle
 628                                 noProblems = false;
 629                                 continue nextInterface;
 630                         }
 631                         if (!superInterface.isValidBinding()) {
 632                                 problemReporter().invalidSuperinterface(
 633                                         sourceType,
 634                                         referenceContext.superInterfaces[i],
 635                                         superInterface);
 636                                 sourceType.tagBits |= HierarchyHasProblems;
 637                                 noProblems = false;
 638                                 continue nextInterface;
 639                         }
 640                         // Check for a duplicate interface once the name is resolved, otherwise we may be confused (ie : a.b.I and c.d.I)
 641                         for (int k = 0; k < count; k++) {
 642                                 if (interfaceBindings[k] == superInterface) {
 643                                         // should this be treated as a warning?
 644                                         problemReporter().duplicateSuperinterface(sourceType, referenceContext, superInterface);
 645                                         continue nextInterface;
 646                                 }
 647                         }
 648                         if (superInterface.isClass()) {
 649                                 problemReporter().superinterfaceMustBeAnInterface(sourceType, referenceContext, superInterface);
 650                                 sourceType.tagBits |= HierarchyHasProblems;
 651                                 noProblems = false;
 652                                 continue nextInterface;
 653                         }
 654                         referenceContext.superInterfaces[i].binding = superInterface;
 655                         // only want to reach here when no errors are reported
 656                         interfaceBindings[count++] = superInterface;
 657                 }
 658                 // hold onto all correctly resolved superinterfaces
 659                 if (count > 0) {
 660                         if (count != length)
 661                                 System.arraycopy(interfaceBindings, 0, interfaceBindings = new ReferenceBinding[count], 0, count);
 662                         sourceType.superInterfaces = interfaceBindings;
 663                 }
 664                 return noProblems;
 665         }
 666
 667         void connectTypeHierarchy() {
 668                 SourceTypeBinding sourceType = referenceContext.binding;
 669                 if ((sourceType.tagBits & BeginHierarchyCheck) == 0) {
 670                         boolean noProblems = true;
 671                         sourceType.tagBits |= BeginHierarchyCheck;
 672                         if (sourceType.isClass())
 673                                 noProblems &= connectSuperclass();
 674                         noProblems &= connectSuperInterfaces();
 675                         sourceType.tagBits |= EndHierarchyCheck;
 676                         if (noProblems && sourceType.isHierarchyInconsistent())
 677                                 problemReporter().hierarchyHasProblems(sourceType);
 678                 }
 679                 connectMemberTypes();
 680                 checkForInheritedMemberTypes(sourceType);
 681         }
 682
 683         private void connectTypeHierarchyWithoutMembers() {
 684                 // must ensure the imports are resolved
 685                 if (parent instanceof CompilationUnitScope) {
 686                         if (((CompilationUnitScope) parent).imports == null)
 687                                  ((CompilationUnitScope) parent).checkAndSetImports();
 688                 } else if (parent instanceof ClassScope) {
 689                         // ensure that the enclosing type has already been checked
 690                          ((ClassScope) parent).connectTypeHierarchyWithoutMembers();
 691                 }
 692
 693                 // double check that the hierarchy search has not already begun...
 694                 SourceTypeBinding sourceType = referenceContext.binding;
 695                 if ((sourceType.tagBits & BeginHierarchyCheck) != 0)
 696                         return;
 697
 698                 boolean noProblems = true;
 699                 sourceType.tagBits |= BeginHierarchyCheck;
 700                 if (sourceType.isClass())
 701                         noProblems &= connectSuperclass();
 702                 noProblems &= connectSuperInterfaces();
 703                 sourceType.tagBits |= EndHierarchyCheck;
 704                 if (noProblems && sourceType.isHierarchyInconsistent())
 705                         problemReporter().hierarchyHasProblems(sourceType);
 706         }
 707
 708         // Answer whether a cycle was found between the sourceType & the superType
 709         private boolean detectCycle(
 710                 SourceTypeBinding sourceType,
 711                 ReferenceBinding superType,
 712                 TypeReference reference) {
 713                 if (sourceType == superType) {
 714                         problemReporter().hierarchyCircularity(sourceType, superType, reference);
 715                         sourceType.tagBits |= HierarchyHasProblems;
 716                         return true;
 717                 }
 718
 719                 if (superType.isBinaryBinding()) {
 720                         // force its superclass & superinterfaces to be found... 2 possibilities exist - the source type is included in the hierarchy of:
 721                         //              - a binary type... this case MUST be caught & reported here
 722                         //              - another source type... this case is reported against the other source type
 723                         boolean hasCycle = false;
 724                         if (superType.superclass() != null) {
 725                                 if (sourceType == superType.superclass()) {
 726                                         problemReporter().hierarchyCircularity(sourceType, superType, reference);
 727                                         sourceType.tagBits |= HierarchyHasProblems;
 728                                         superType.tagBits |= HierarchyHasProblems;
 729                                         return true;
 730                                 }
 731                                 hasCycle |= detectCycle(sourceType, superType.superclass(), reference);
 732                                 if ((superType.superclass().tagBits & HierarchyHasProblems) != 0) {
 733                                         sourceType.tagBits |= HierarchyHasProblems;
 734                                         superType.tagBits |= HierarchyHasProblems; // propagate down the hierarchy
 735                                 }
 736                         }
 737
 738                         ReferenceBinding[] itsInterfaces = superType.superInterfaces();
 739                         if (itsInterfaces != NoSuperInterfaces) {
 740                                 for (int i = 0, length = itsInterfaces.length; i < length; i++) {
 741                                         ReferenceBinding anInterface = itsInterfaces[i];
 742                                         if (sourceType == anInterface) {
 743                                                 problemReporter().hierarchyCircularity(sourceType, superType, reference);
 744                                                 sourceType.tagBits |= HierarchyHasProblems;
 745                                                 superType.tagBits |= HierarchyHasProblems;
 746                                                 return true;
 747                                         }
 748                                         hasCycle |= detectCycle(sourceType, anInterface, reference);
 749                                         if ((anInterface.tagBits & HierarchyHasProblems) != 0) {
 750                                                 sourceType.tagBits |= HierarchyHasProblems;
 751                                                 superType.tagBits |= HierarchyHasProblems;
 752                                         }
 753                                 }
 754                         }
 755                         return hasCycle;
 756                 }
 757
 758                 if ((superType.tagBits & EndHierarchyCheck) == 0
 759                         && (superType.tagBits & BeginHierarchyCheck) != 0) {
 760                         problemReporter().hierarchyCircularity(sourceType, superType, reference);
 761                         sourceType.tagBits |= HierarchyHasProblems;
 762                         superType.tagBits |= HierarchyHasProblems;
 763                         return true;
 764                 }
 765                 if ((superType.tagBits & BeginHierarchyCheck) == 0)
 766                         // ensure if this is a source superclass that it has already been checked
 767                          ((SourceTypeBinding) superType).scope.connectTypeHierarchyWithoutMembers();
 768                 if ((superType.tagBits & HierarchyHasProblems) != 0)
 769                         sourceType.tagBits |= HierarchyHasProblems;
 770                 return false;
 771         }
 772
 773         private ReferenceBinding findSupertype(TypeReference typeReference) {
 774                 typeReference.aboutToResolve(this); // allows us to trap completion & selection nodes
 775                 char[][] compoundName = typeReference.getTypeName();
 776                 compilationUnitScope().recordQualifiedReference(compoundName);
 777                 SourceTypeBinding sourceType = referenceContext.binding;
 778                 int size = compoundName.length;
 779                 int n = 1;
 780                 ReferenceBinding superType;
 781
 782                 // resolve the first name of the compoundName
 783                 if (CharOperation.equals(compoundName[0], sourceType.sourceName)) {
 784                         superType = sourceType;
 785                         // match against the sourceType even though nested members cannot be supertypes
 786                 } else {
 787                         Binding typeOrPackage = parent.getTypeOrPackage(compoundName[0], TYPE | PACKAGE);
 788                         if (typeOrPackage == null || !typeOrPackage.isValidBinding())
 789                                 return new ProblemReferenceBinding(
 790                                         compoundName[0],
 791                                         typeOrPackage == null ? NotFound : typeOrPackage.problemId());
 792
 793                         boolean checkVisibility = false;
 794                         for (; n < size; n++) {
 795                                 if (!(typeOrPackage instanceof PackageBinding))
 796                                         break;
 797                                 PackageBinding packageBinding = (PackageBinding) typeOrPackage;
 798                                 typeOrPackage = packageBinding.getTypeOrPackage(compoundName[n]);
 799                                 if (typeOrPackage == null || !typeOrPackage.isValidBinding())
 800                                         return new ProblemReferenceBinding(
 801                                                 CharOperation.subarray(compoundName, 0, n + 1),
 802                                                 typeOrPackage == null ? NotFound : typeOrPackage.problemId());
 803                                 checkVisibility = true;
 804                         }
 805
 806                         // convert to a ReferenceBinding
 807                         if (typeOrPackage instanceof PackageBinding) // error, the compoundName is a packageName
 808                                 return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, n), NotFound);
 809                         superType = (ReferenceBinding) typeOrPackage;
 810                         compilationUnitScope().recordTypeReference(superType); // to record supertypes
 811
 812                         if (checkVisibility
 813                                 && n == size) { // if we're finished and know the final supertype then check visibility
 814                                 if (!superType.canBeSeenBy(sourceType.fPackage))
 815                                         // its a toplevel type so just check package access
 816                                         return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, n), superType, NotVisible);
 817                         }
 818                 }
 819                 // at this point we know we have a type but we have to look for cycles
 820                 while (true) {
 821                         // must detect cycles & force connection up the hierarchy... also handle cycles with binary types.
 822                         // must be guaranteed that the superType knows its entire hierarchy
 823                         if (detectCycle(sourceType, superType, typeReference))
 824                                 return null; // cycle error was already reported
 825
 826                         if (n >= size)
 827                                 break;
 828
 829                         // retrieve the next member type
 830                         char[] typeName = compoundName[n++];
 831                         superType = findMemberType(typeName, superType);
 832                         if (superType == null)
 833                                 return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, n), NotFound);
 834                         if (!superType.isValidBinding()) {
 835                                 superType.compoundName = CharOperation.subarray(compoundName, 0, n);
 836                                 return superType;
 837                         }
 838                 }
 839                 return superType;
 840         }
 841
 842         /* Answer the problem reporter to use for raising new problems.
 843         *
 844         * Note that as a side-effect, this updates the current reference context
 845         * (unit, type or method) in case the problem handler decides it is necessary
 846         * to abort.
 847         */
 848         public ProblemReporter problemReporter() {
 849                 MethodScope outerMethodScope;
 850                 if ((outerMethodScope = outerMostMethodScope()) == null) {
 851                         ProblemReporter problemReporter = referenceCompilationUnit().problemReporter;
 852                         problemReporter.referenceContext = referenceContext;
 853                         return problemReporter;
 854                 } else {
 855                         return outerMethodScope.problemReporter();
 856                 }
 857         }
 858
 859         /* Answer the reference type of this scope.
 860         *
 861         * i.e. the nearest enclosing type of this scope.
 862         */
 863         public TypeDeclaration referenceType() {
 864                 return referenceContext;
 865         }
 866
 867         public String toString() {
 868                 if (referenceContext != null)
 869                         return "--- Class Scope ---\n\n"  //$NON-NLS-1$
 870                         +referenceContext.binding.toString();
 871                 else
 872                         return "--- Class Scope ---\n\n Binding not initialized" ; //$NON-NLS-1$
 873         }
 874 }