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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.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.core.compiler.CharOperation;
  14 import net.sourceforge.phpdt.internal.compiler.env.IBinaryType;
  15 import net.sourceforge.phpdt.internal.compiler.env.INameEnvironment;
  16 import net.sourceforge.phpdt.internal.compiler.env.NameEnvironmentAnswer;
  17 import net.sourceforge.phpdt.internal.compiler.impl.ITypeRequestor;
  18 import net.sourceforge.phpdt.internal.compiler.problem.ProblemReporter;
  19 import net.sourceforge.phpdt.internal.compiler.util.HashtableOfPackage;
  20 import net.sourceforge.phpdt.internal.compiler.util.Util;
  21 import net.sourceforge.phpeclipse.internal.compiler.ast.CompilationUnitDeclaration;
  22
  23 public class LookupEnvironment implements BaseTypes, ProblemReasons, TypeConstants {
  24 //      public CompilerOptions options;
  25         public ProblemReporter problemReporter;
  26         public ITypeRequestor typeRequestor;
  27
  28         PackageBinding defaultPackage;
  29         ImportBinding[] defaultImports;
  30         HashtableOfPackage knownPackages;
  31         static final ProblemPackageBinding TheNotFoundPackage = new ProblemPackageBinding(CharOperation.NO_CHAR, NotFound);
  32         static final ProblemReferenceBinding TheNotFoundType = new ProblemReferenceBinding(CharOperation.NO_CHAR, NotFound);
  33
  34         private INameEnvironment nameEnvironment;
  35         private MethodVerifier verifier;
  36         private ArrayBinding[][] uniqueArrayBindings;
  37
  38         private CompilationUnitDeclaration[] units = new CompilationUnitDeclaration[4];
  39         private int lastUnitIndex = -1;
  40         private int lastCompletedUnitIndex = -1;
  41
  42         // indicate in which step on the compilation we are.
  43         // step 1 : build the reference binding
  44         // step 2 : conect the hierarchy (connect bindings)
  45         // step 3 : build fields and method bindings.
  46         private int stepCompleted;
  47         final static int BUILD_TYPE_HIERARCHY = 1;
  48         final static int CHECK_AND_SET_IMPORTS = 2;
  49         final static int CONNECT_TYPE_HIERARCHY = 3;
  50         final static int BUILD_FIELDS_AND_METHODS = 4;
  51 public LookupEnvironment(ITypeRequestor typeRequestor,ProblemReporter problemReporter, INameEnvironment nameEnvironment) {
  52 // CompilerOptions options, ProblemReporter problemReporter, INameEnvironment nameEnvironment) {
  53         this.typeRequestor = typeRequestor;
  54 //      this.options = options;
  55         this.problemReporter = problemReporter;
  56         this.defaultPackage = new PackageBinding(this); // assume the default package always exists
  57         this.defaultImports = null;
  58         this.nameEnvironment = nameEnvironment;
  59         this.knownPackages = new HashtableOfPackage();
  60         this.uniqueArrayBindings = new ArrayBinding[5][];
  61         this.uniqueArrayBindings[0] = new ArrayBinding[50]; // start off the most common 1 dimension array @ 50
  62 }
  63 /* Ask the oracle for a type which corresponds to the compoundName.
  64 * Answer null if the name cannot be found.
  65 */
  66
  67 public ReferenceBinding askForType(char[][] compoundName) {
  68         NameEnvironmentAnswer answer = nameEnvironment.findType(compoundName);
  69         if (answer == null)
  70                 return null;
  71
  72         if (answer.isBinaryType())
  73                 // the type was found as a .class file
  74                 typeRequestor.accept(answer.getBinaryType(), computePackageFrom(compoundName));
  75         else if (answer.isCompilationUnit())
  76                 // the type was found as a .java file, try to build it then search the cache
  77                 typeRequestor.accept(answer.getCompilationUnit());
  78         else if (answer.isSourceType())
  79                 // the type was found as a source model
  80                 typeRequestor.accept(answer.getSourceTypes(), computePackageFrom(compoundName));
  81
  82         return getCachedType(compoundName);
  83 }
  84 /* Ask the oracle for a type named name in the packageBinding.
  85 * Answer null if the name cannot be found.
  86 */
  87
  88 ReferenceBinding askForType(PackageBinding packageBinding, char[] name) {
  89         if (packageBinding == null) {
  90                 if (defaultPackage == null)
  91                         return null;
  92                 packageBinding = defaultPackage;
  93         }
  94         NameEnvironmentAnswer answer = nameEnvironment.findType(name, packageBinding.compoundName);
  95         if (answer == null)
  96                 return null;
  97
  98         if (answer.isBinaryType())
  99                 // the type was found as a .class file
 100                 typeRequestor.accept(answer.getBinaryType(), packageBinding);
 101         else if (answer.isCompilationUnit())
 102                 // the type was found as a .java file, try to build it then search the cache
 103                 typeRequestor.accept(answer.getCompilationUnit());
 104         else if (answer.isSourceType())
 105                 // the type was found as a source model
 106                 typeRequestor.accept(answer.getSourceTypes(), packageBinding);
 107
 108         return packageBinding.getType0(name);
 109 }
 110 /* Create the initial type bindings for the compilation unit.
 111 *
 112 * See completeTypeBindings() for a description of the remaining steps
 113 *
 114 * NOTE: This method can be called multiple times as additional source files are needed
 115 */
 116
 117 public void buildTypeBindings(CompilationUnitDeclaration unit) {
 118         CompilationUnitScope scope = new CompilationUnitScope(unit, this);
 119         scope.buildTypeBindings();
 120
 121         int unitsLength = units.length;
 122         if (++lastUnitIndex >= unitsLength)
 123                 System.arraycopy(units, 0, units = new CompilationUnitDeclaration[2 * unitsLength], 0, unitsLength);
 124         units[lastUnitIndex] = unit;
 125 }
 126 /* Cache the binary type since we know it is needed during this compile.
 127 *
 128 * Answer the created BinaryTypeBinding or null if the type is already in the cache.
 129 */
 130
 131 public BinaryTypeBinding cacheBinaryType(IBinaryType binaryType) {
 132         return cacheBinaryType(binaryType, true);
 133 }
 134 /* Cache the binary type since we know it is needed during this compile.
 135 *
 136 * Answer the created BinaryTypeBinding or null if the type is already in the cache.
 137 */
 138
 139 public BinaryTypeBinding cacheBinaryType(IBinaryType binaryType, boolean needFieldsAndMethods) {
 140         char[][] compoundName = CharOperation.splitOn('/', binaryType.getName());
 141         ReferenceBinding existingType = getCachedType(compoundName);
 142
 143         if (existingType == null || existingType instanceof UnresolvedReferenceBinding)
 144                 // only add the binary type if its not already in the cache
 145                 return createBinaryTypeFrom(binaryType, computePackageFrom(compoundName), needFieldsAndMethods);
 146         return null; // the type already exists & can be retrieved from the cache
 147 }
 148 /*
 149 * 1. Connect the type hierarchy for the type bindings created for parsedUnits.
 150 * 2. Create the field bindings
 151 * 3. Create the method bindings
 152 */
 153
 154 /* We know each known compilationUnit is free of errors at this point...
 155 *
 156 * Each step will create additional bindings unless a problem is detected, in which
 157 * case either the faulty import/superinterface/field/method will be skipped or a
 158 * suitable replacement will be substituted (such as Object for a missing superclass)
 159 */
 160
 161 public void completeTypeBindings() {
 162         stepCompleted = BUILD_TYPE_HIERARCHY;
 163
 164 //      for (int i = lastCompletedUnitIndex + 1; i <= lastUnitIndex; i++) {
 165 //              units[i].scope.checkAndSetImports();
 166 //      }
 167         stepCompleted = CHECK_AND_SET_IMPORTS;
 168
 169 //      for (int i = lastCompletedUnitIndex + 1; i <= lastUnitIndex; i++) {
 170 //              units[i].scope.connectTypeHierarchy();
 171 //      }
 172         stepCompleted = CONNECT_TYPE_HIERARCHY;
 173
 174         for (int i = lastCompletedUnitIndex + 1; i <= lastUnitIndex; i++) {
 175 //              units[i].scope.buildFieldsAndMethods();
 176                 units[i] = null; // release unnecessary reference to the parsed unit
 177         }
 178         stepCompleted = BUILD_FIELDS_AND_METHODS;
 179         lastCompletedUnitIndex = lastUnitIndex;
 180 }
 181 /*
 182 * 1. Connect the type hierarchy for the type bindings created for parsedUnits.
 183 * 2. Create the field bindings
 184 * 3. Create the method bindings
 185 */
 186
 187 /*
 188 * Each step will create additional bindings unless a problem is detected, in which
 189 * case either the faulty import/superinterface/field/method will be skipped or a
 190 * suitable replacement will be substituted (such as Object for a missing superclass)
 191 */
 192
 193 public void completeTypeBindings(CompilationUnitDeclaration parsedUnit) {
 194         if (stepCompleted == BUILD_FIELDS_AND_METHODS) {
 195                 // This can only happen because the original set of units are completely built and
 196                 // are now being processed, so we want to treat all the additional units as a group
 197                 // until they too are completely processed.
 198                 completeTypeBindings();
 199         } else {
 200                 if (parsedUnit.scope == null) return; // parsing errors were too severe
 201
 202                 if (stepCompleted >= CHECK_AND_SET_IMPORTS)
 203                         parsedUnit.scope.checkAndSetImports();
 204
 205                 if (stepCompleted >= CONNECT_TYPE_HIERARCHY)
 206                         parsedUnit.scope.connectTypeHierarchy();
 207         }
 208 }
 209 /*
 210 * Used by other compiler tools which do not start by calling completeTypeBindings().
 211 *
 212 * 1. Connect the type hierarchy for the type bindings created for parsedUnits.
 213 * 2. Create the field bindings
 214 * 3. Create the method bindings
 215 */
 216
 217 public void completeTypeBindings(CompilationUnitDeclaration parsedUnit, boolean buildFieldsAndMethods) {
 218         if (parsedUnit.scope == null) return; // parsing errors were too severe
 219
 220         parsedUnit.scope.checkAndSetImports();
 221         parsedUnit.scope.connectTypeHierarchy();
 222
 223         if (buildFieldsAndMethods)
 224                 parsedUnit.scope.buildFieldsAndMethods();
 225 }
 226 private PackageBinding computePackageFrom(char[][] constantPoolName) {
 227         if (constantPoolName.length == 1)
 228                 return defaultPackage;
 229
 230         PackageBinding packageBinding = getPackage0(constantPoolName[0]);
 231         if (packageBinding == null || packageBinding == TheNotFoundPackage) {
 232                 packageBinding = new PackageBinding(constantPoolName[0], this);
 233                 knownPackages.put(constantPoolName[0], packageBinding);
 234         }
 235
 236         for (int i = 1, length = constantPoolName.length - 1; i < length; i++) {
 237                 PackageBinding parent = packageBinding;
 238                 if ((packageBinding = parent.getPackage0(constantPoolName[i])) == null || packageBinding == TheNotFoundPackage) {
 239                         packageBinding = new PackageBinding(CharOperation.subarray(constantPoolName, 0, i + 1), parent, this);
 240                         parent.addPackage(packageBinding);
 241                 }
 242         }
 243         return packageBinding;
 244 }
 245 /* Used to guarantee array type identity.
 246 */
 247
 248 ArrayBinding createArrayType(TypeBinding type, int dimensionCount) {
 249         if (type instanceof LocalTypeBinding) // cache local type arrays with the local type itself
 250                 return ((LocalTypeBinding) type).createArrayType(dimensionCount);
 251
 252         // find the array binding cache for this dimension
 253         int dimIndex = dimensionCount - 1;
 254         int length = uniqueArrayBindings.length;
 255         ArrayBinding[] arrayBindings;
 256         if (dimIndex < length) {
 257                 if ((arrayBindings = uniqueArrayBindings[dimIndex]) == null)
 258                         uniqueArrayBindings[dimIndex] = arrayBindings = new ArrayBinding[10];
 259         } else {
 260                 System.arraycopy(
 261                         uniqueArrayBindings, 0,
 262                         uniqueArrayBindings = new ArrayBinding[dimensionCount][], 0,
 263                         length);
 264                 uniqueArrayBindings[dimIndex] = arrayBindings = new ArrayBinding[10];
 265         }
 266
 267         // find the cached array binding for this leaf component type (if any)
 268         int index = -1;
 269         length = arrayBindings.length;
 270         while (++index < length) {
 271                 ArrayBinding currentBinding = arrayBindings[index];
 272                 if (currentBinding == null) // no matching array, but space left
 273                         return arrayBindings[index] = new ArrayBinding(type, dimensionCount);
 274                 if (currentBinding.leafComponentType == type)
 275                         return currentBinding;
 276         }
 277
 278         // no matching array, no space left
 279         System.arraycopy(
 280                 arrayBindings, 0,
 281                 (arrayBindings = new ArrayBinding[length * 2]), 0,
 282                 length);
 283         uniqueArrayBindings[dimIndex] = arrayBindings;
 284         return arrayBindings[length] = new ArrayBinding(type, dimensionCount);
 285 }
 286 public BinaryTypeBinding createBinaryTypeFrom(IBinaryType binaryType, PackageBinding packageBinding) {
 287         return createBinaryTypeFrom(binaryType, packageBinding, true);
 288 }
 289 public BinaryTypeBinding createBinaryTypeFrom(IBinaryType binaryType, PackageBinding packageBinding, boolean needFieldsAndMethods) {
 290         BinaryTypeBinding binaryBinding = new BinaryTypeBinding(packageBinding, binaryType, this);
 291
 292         // resolve any array bindings which reference the unresolvedType
 293         ReferenceBinding cachedType = packageBinding.getType0(binaryBinding.compoundName[binaryBinding.compoundName.length - 1]);
 294         if (cachedType != null) {
 295                 if (cachedType.isBinaryBinding()) // sanity check before the cast... at this point the cache should ONLY contain unresolved types
 296                         return (BinaryTypeBinding) cachedType;
 297
 298                 UnresolvedReferenceBinding unresolvedType = (UnresolvedReferenceBinding) cachedType;
 299                 unresolvedType.resolvedType = binaryBinding;
 300                 updateArrayCache(unresolvedType, binaryBinding);
 301         }
 302
 303         packageBinding.addType(binaryBinding);
 304         binaryBinding.cachePartsFrom(binaryType, needFieldsAndMethods);
 305         return binaryBinding;
 306 }
 307 /* Used to create packages from the package statement.
 308 */
 309
 310 PackageBinding createPackage(char[][] compoundName) {
 311         PackageBinding packageBinding = getPackage0(compoundName[0]);
 312         if (packageBinding == null || packageBinding == TheNotFoundPackage) {
 313                 packageBinding = new PackageBinding(compoundName[0], this);
 314                 knownPackages.put(compoundName[0], packageBinding);
 315         }
 316
 317         for (int i = 1, length = compoundName.length; i < length; i++) {
 318                 // check to see if it collides with a known type...
 319                 // this case can only happen if the package does not exist as a directory in the file system
 320                 // otherwise when the source type was defined, the correct error would have been reported
 321                 // unless its an unresolved type which is referenced from an inconsistent class file
 322                 ReferenceBinding type = packageBinding.getType0(compoundName[i]);
 323                 if (type != null && type != TheNotFoundType && !(type instanceof UnresolvedReferenceBinding))
 324                         return null;
 325
 326                 PackageBinding parent = packageBinding;
 327                 if ((packageBinding = parent.getPackage0(compoundName[i])) == null || packageBinding == TheNotFoundPackage) {
 328                         // if the package is unknown, check to see if a type exists which would collide with the new package
 329                         // catches the case of a package statement of: package java.lang.Object;
 330                         // since the package can be added after a set of source files have already been compiled, we need
 331                         // whenever a package statement is encountered
 332                         if (nameEnvironment.findType(compoundName[i], parent.compoundName) != null)
 333                                 return null;
 334
 335                         packageBinding = new PackageBinding(CharOperation.subarray(compoundName, 0, i + 1), parent, this);
 336                         parent.addPackage(packageBinding);
 337                 }
 338         }
 339         return packageBinding;
 340 }
 341 /* Answer the type for the compoundName if it exists in the cache.
 342 * Answer theNotFoundType if it could not be resolved the first time
 343 * it was looked up, otherwise answer null.
 344 *
 345 * NOTE: Do not use for nested types... the answer is NOT the same for a.b.C or a.b.C.D.E
 346 * assuming C is a type in both cases. In the a.b.C.D.E case, null is the answer.
 347 */
 348
 349 public ReferenceBinding getCachedType(char[][] compoundName) {
 350         if (compoundName.length == 1) {
 351                 if (defaultPackage == null)
 352                         return null;
 353                 return defaultPackage.getType0(compoundName[0]);
 354         }
 355
 356         PackageBinding packageBinding = getPackage0(compoundName[0]);
 357         if (packageBinding == null || packageBinding == TheNotFoundPackage)
 358                 return null;
 359
 360         for (int i = 1, packageLength = compoundName.length - 1; i < packageLength; i++)
 361                 if ((packageBinding = packageBinding.getPackage0(compoundName[i])) == null || packageBinding == TheNotFoundPackage)
 362                         return null;
 363         return packageBinding.getType0(compoundName[compoundName.length - 1]);
 364 }
 365 /* Answer the top level package named name if it exists in the cache.
 366 * Answer theNotFoundPackage if it could not be resolved the first time
 367 * it was looked up, otherwise answer null.
 368 *
 369 * NOTE: Senders must convert theNotFoundPackage into a real problem
 370 * package if its to returned.
 371 */
 372
 373 PackageBinding getPackage0(char[] name) {
 374         return knownPackages.get(name);
 375 }
 376 /* Answer the top level package named name.
 377 * Ask the oracle for the package if its not in the cache.
 378 * Answer null if the package cannot be found.
 379 */
 380
 381 PackageBinding getTopLevelPackage(char[] name) {
 382         PackageBinding packageBinding = getPackage0(name);
 383         if (packageBinding != null) {
 384                 if (packageBinding == TheNotFoundPackage)
 385                         return null;
 386                 else
 387                         return packageBinding;
 388         }
 389
 390         if (nameEnvironment.isPackage(null, name)) {
 391                 knownPackages.put(name, packageBinding = new PackageBinding(name, this));
 392                 return packageBinding;
 393         }
 394
 395         knownPackages.put(name, TheNotFoundPackage); // saves asking the oracle next time
 396         return null;
 397 }
 398 /* Answer the type corresponding to the compoundName.
 399 * Ask the oracle for the type if its not in the cache.
 400 * Answer null if the type cannot be found... likely a fatal error.
 401 */
 402
 403 public ReferenceBinding getType(char[][] compoundName) {
 404         ReferenceBinding referenceBinding;
 405
 406         if (compoundName.length == 1) {
 407                 if (defaultPackage == null)
 408                         return null;
 409
 410                 if ((referenceBinding = defaultPackage.getType0(compoundName[0])) == null) {
 411                         PackageBinding packageBinding = getPackage0(compoundName[0]);
 412                         if (packageBinding != null && packageBinding != TheNotFoundPackage)
 413                                 return null; // collides with a known package... should not call this method in such a case
 414                         referenceBinding = askForType(defaultPackage, compoundName[0]);
 415                 }
 416         } else {
 417                 PackageBinding packageBinding = getPackage0(compoundName[0]);
 418                 if (packageBinding == TheNotFoundPackage)
 419                         return null;
 420
 421                 if (packageBinding != null) {
 422                         for (int i = 1, packageLength = compoundName.length - 1; i < packageLength; i++) {
 423                                 if ((packageBinding = packageBinding.getPackage0(compoundName[i])) == null)
 424                                         break;
 425                                 if (packageBinding == TheNotFoundPackage)
 426                                         return null;
 427                         }
 428                 }
 429
 430                 if (packageBinding == null)
 431                         referenceBinding = askForType(compoundName);
 432                 else if ((referenceBinding = packageBinding.getType0(compoundName[compoundName.length - 1])) == null)
 433                         referenceBinding = askForType(packageBinding, compoundName[compoundName.length - 1]);
 434         }
 435
 436         if (referenceBinding == null || referenceBinding == TheNotFoundType)
 437                 return null;
 438         if (referenceBinding instanceof UnresolvedReferenceBinding)
 439                 referenceBinding = ((UnresolvedReferenceBinding) referenceBinding).resolve(this);
 440
 441         // compoundName refers to a nested type incorrectly (for example, package1.A$B)
 442         if (referenceBinding.isNestedType())
 443                 return new ProblemReferenceBinding(compoundName, InternalNameProvided);
 444         else
 445                 return referenceBinding;
 446 }
 447 /* Answer the type corresponding to the name from the binary file.
 448 * Does not ask the oracle for the type if its not found in the cache... instead an
 449 * unresolved type is returned which must be resolved before used.
 450 *
 451 * NOTE: Does NOT answer base types nor array types!
 452 *
 453 * NOTE: Aborts compilation if the class file cannot be found.
 454 */
 455
 456 ReferenceBinding getTypeFromConstantPoolName(char[] signature, int start, int end) {
 457         if (end == -1)
 458                 end = signature.length;
 459
 460         char[][] compoundName = CharOperation.splitOn('/', signature, start, end);
 461         ReferenceBinding binding = getCachedType(compoundName);
 462         if (binding == null) {
 463                 PackageBinding packageBinding = computePackageFrom(compoundName);
 464                 binding = new UnresolvedReferenceBinding(compoundName, packageBinding);
 465                 packageBinding.addType(binding);
 466         } else if (binding == TheNotFoundType) {
 467                 problemReporter.isClassPathCorrect(compoundName, null);
 468                 return null; // will not get here since the above error aborts the compilation
 469         }
 470         return binding;
 471 }
 472 /* Answer the type corresponding to the signature from the binary file.
 473 * Does not ask the oracle for the type if its not found in the cache... instead an
 474 * unresolved type is returned which must be resolved before used.
 475 *
 476 * NOTE: Does answer base types & array types.
 477 *
 478 * NOTE: Aborts compilation if the class file cannot be found.
 479 */
 480
 481 TypeBinding getTypeFromSignature(char[] signature, int start, int end) {
 482         int dimension = 0;
 483         while (signature[start] == '[') {
 484                 start++;
 485                 dimension++;
 486         }
 487         if (end == -1)
 488                 end = signature.length - 1;
 489
 490         // Just switch on signature[start] - the L case is the else
 491         TypeBinding binding = null;
 492         if (start == end) {
 493                 switch (signature[start]) {
 494                         case 'I' :
 495                                 binding = IntBinding;
 496                                 break;
 497                         case 'Z' :
 498                                 binding = BooleanBinding;
 499                                 break;
 500                         case 'V' :
 501                                 binding = VoidBinding;
 502                                 break;
 503                         case 'C' :
 504                                 binding = CharBinding;
 505                                 break;
 506                         case 'D' :
 507                                 binding = DoubleBinding;
 508                                 break;
 509                         case 'B' :
 510                                 binding = ByteBinding;
 511                                 break;
 512                         case 'F' :
 513                                 binding = FloatBinding;
 514                                 break;
 515                         case 'J' :
 516                                 binding = LongBinding;
 517                                 break;
 518                         case 'S' :
 519                                 binding = ShortBinding;
 520                                 break;
 521                         default :
 522                                 throw new Error(Util.bind("error.undefinedBaseType",String.valueOf(signature[start]))); //$NON-NLS-1$
 523                 }
 524         } else {
 525                 binding = getTypeFromConstantPoolName(signature, start + 1, end);
 526         }
 527
 528         if (dimension == 0)
 529                 return binding;
 530         else
 531                 return createArrayType(binding, dimension);
 532 }
 533 /* Ask the oracle if a package exists named name in the package named compoundName.
 534 */
 535
 536 boolean isPackage(char[][] compoundName, char[] name) {
 537         if (compoundName == null || compoundName.length == 0)
 538                 return nameEnvironment.isPackage(null, name);
 539         else
 540                 return nameEnvironment.isPackage(compoundName, name);
 541 }
 542 // The method verifier is lazily initialized to guarantee the receiver, the compiler & the oracle are ready.
 543
 544 public MethodVerifier methodVerifier() {
 545         if (verifier == null)
 546                 verifier = new MethodVerifier(this);
 547         return verifier;
 548 }
 549 public void reset() {
 550         this.defaultPackage = new PackageBinding(this); // assume the default package always exists
 551         this.defaultImports = null;
 552         this.knownPackages = new HashtableOfPackage();
 553
 554         this.verifier = null;
 555         for (int i = this.uniqueArrayBindings.length; --i >= 0;)
 556                 this.uniqueArrayBindings[i] = null;
 557         this.uniqueArrayBindings[0] = new ArrayBinding[50]; // start off the most common 1 dimension array @ 50
 558
 559         for (int i = this.units.length; --i >= 0;)
 560                 this.units[i] = null;
 561         this.lastUnitIndex = -1;
 562         this.lastCompletedUnitIndex = -1;
 563
 564         // name environment has a longer life cycle, and must be reset in
 565         // the code which created it.
 566 }
 567 void updateArrayCache(UnresolvedReferenceBinding unresolvedType, ReferenceBinding resolvedType) {
 568         nextDimension : for (int i = 0, length = uniqueArrayBindings.length; i < length; i++) {
 569                 ArrayBinding[] arrayBindings = uniqueArrayBindings[i];
 570                 if (arrayBindings != null) {
 571                         for (int j = 0, max = arrayBindings.length; j < max; j++) {
 572                                 ArrayBinding currentBinding = arrayBindings[j];
 573                                 if (currentBinding == null)
 574                                         continue nextDimension;
 575                                 if (currentBinding.leafComponentType == unresolvedType) {
 576                                         currentBinding.leafComponentType = resolvedType;
 577                                         continue nextDimension;
 578                                 }
 579                         }
 580                 }
 581         }
 582 }
 583 }