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

   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.ast.CompilationUnitDeclaration;
  15 import net.sourceforge.phpdt.internal.compiler.env.IBinaryType;
  16 import net.sourceforge.phpdt.internal.compiler.env.INameEnvironment;
  17 import net.sourceforge.phpdt.internal.compiler.env.NameEnvironmentAnswer;
  18 import net.sourceforge.phpdt.internal.compiler.impl.ITypeRequestor;
  19 import net.sourceforge.phpdt.internal.compiler.problem.ProblemReporter;
  20 import net.sourceforge.phpdt.internal.compiler.util.HashtableOfPackage;
  21 import net.sourceforge.phpdt.internal.compiler.util.Util;
  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
 227 private PackageBinding computePackageFrom(char[][] constantPoolName) {
 228         if (constantPoolName.length == 1)
 229                 return defaultPackage;
 230
 231         PackageBinding packageBinding = getPackage0(constantPoolName[0]);
 232         if (packageBinding == null || packageBinding == TheNotFoundPackage) {
 233                 packageBinding = new PackageBinding(constantPoolName[0], this);
 234                 knownPackages.put(constantPoolName[0], packageBinding);
 235         }
 236
 237         for (int i = 1, length = constantPoolName.length - 1; i < length; i++) {
 238                 PackageBinding parent = packageBinding;
 239                 if ((packageBinding = parent.getPackage0(constantPoolName[i])) == null || packageBinding == TheNotFoundPackage) {
 240                         packageBinding = new PackageBinding(CharOperation.subarray(constantPoolName, 0, i + 1), parent, this);
 241                         parent.addPackage(packageBinding);
 242                 }
 243         }
 244         return packageBinding;
 245 }
 246 /* Used to guarantee array type identity.
 247 */
 248
 249 ArrayBinding createArrayType(TypeBinding type, int dimensionCount) {
 250         if (type instanceof LocalTypeBinding) // cache local type arrays with the local type itself
 251                 return ((LocalTypeBinding) type).createArrayType(dimensionCount);
 252
 253         // find the array binding cache for this dimension
 254         int dimIndex = dimensionCount - 1;
 255         int length = uniqueArrayBindings.length;
 256         ArrayBinding[] arrayBindings;
 257         if (dimIndex < length) {
 258                 if ((arrayBindings = uniqueArrayBindings[dimIndex]) == null)
 259                         uniqueArrayBindings[dimIndex] = arrayBindings = new ArrayBinding[10];
 260         } else {
 261                 System.arraycopy(
 262                         uniqueArrayBindings, 0,
 263                         uniqueArrayBindings = new ArrayBinding[dimensionCount][], 0,
 264                         length);
 265                 uniqueArrayBindings[dimIndex] = arrayBindings = new ArrayBinding[10];
 266         }
 267
 268         // find the cached array binding for this leaf component type (if any)
 269         int index = -1;
 270         length = arrayBindings.length;
 271         while (++index < length) {
 272                 ArrayBinding currentBinding = arrayBindings[index];
 273                 if (currentBinding == null) // no matching array, but space left
 274                         return arrayBindings[index] = new ArrayBinding(type, dimensionCount);
 275                 if (currentBinding.leafComponentType == type)
 276                         return currentBinding;
 277         }
 278
 279         // no matching array, no space left
 280         System.arraycopy(
 281                 arrayBindings, 0,
 282                 (arrayBindings = new ArrayBinding[length * 2]), 0,
 283                 length);
 284         uniqueArrayBindings[dimIndex] = arrayBindings;
 285         return arrayBindings[length] = new ArrayBinding(type, dimensionCount);
 286 }
 287 public BinaryTypeBinding createBinaryTypeFrom(IBinaryType binaryType, PackageBinding packageBinding) {
 288         return createBinaryTypeFrom(binaryType, packageBinding, true);
 289 }
 290 public BinaryTypeBinding createBinaryTypeFrom(IBinaryType binaryType, PackageBinding packageBinding, boolean needFieldsAndMethods) {
 291         BinaryTypeBinding binaryBinding = new BinaryTypeBinding(packageBinding, binaryType, this);
 292
 293         // resolve any array bindings which reference the unresolvedType
 294         ReferenceBinding cachedType = packageBinding.getType0(binaryBinding.compoundName[binaryBinding.compoundName.length - 1]);
 295         if (cachedType != null) {
 296                 if (cachedType.isBinaryBinding()) // sanity check before the cast... at this point the cache should ONLY contain unresolved types
 297                         return (BinaryTypeBinding) cachedType;
 298
 299                 UnresolvedReferenceBinding unresolvedType = (UnresolvedReferenceBinding) cachedType;
 300                 unresolvedType.resolvedType = binaryBinding;
 301                 updateArrayCache(unresolvedType, binaryBinding);
 302         }
 303
 304         packageBinding.addType(binaryBinding);
 305         binaryBinding.cachePartsFrom(binaryType, needFieldsAndMethods);
 306         return binaryBinding;
 307 }
 308 /* Used to create packages from the package statement.
 309 */
 310
 311 PackageBinding createPackage(char[][] compoundName) {
 312     return null;
 313 //      PackageBinding packageBinding = getPackage0(compoundName[0]);
 314 //      if (packageBinding == null || packageBinding == TheNotFoundPackage) {
 315 //              packageBinding = new PackageBinding(compoundName[0], this);
 316 //              knownPackages.put(compoundName[0], packageBinding);
 317 //      }
 318 //
 319 //      for (int i = 1, length = compoundName.length; i < length; i++) {
 320 //              // check to see if it collides with a known type...
 321 //              // this case can only happen if the package does not exist as a directory in the file system
 322 //              // otherwise when the source type was defined, the correct error would have been reported
 323 //              // unless its an unresolved type which is referenced from an inconsistent class file
 324 //              ReferenceBinding type = packageBinding.getType0(compoundName[i]);
 325 //              if (type != null && type != TheNotFoundType && !(type instanceof UnresolvedReferenceBinding))
 326 //                      return null;
 327 //
 328 //              PackageBinding parent = packageBinding;
 329 //              if ((packageBinding = parent.getPackage0(compoundName[i])) == null || packageBinding == TheNotFoundPackage) {
 330 //                      // if the package is unknown, check to see if a type exists which would collide with the new package
 331 //                      // catches the case of a package statement of: package java.lang.Object;
 332 //                      // since the package can be added after a set of source files have already been compiled, we need
 333 //                      // whenever a package statement is encountered
 334 //                      if (nameEnvironment.findType(compoundName[i], parent.compoundName) != null)
 335 //                              return null;
 336 //
 337 //                      packageBinding = new PackageBinding(CharOperation.subarray(compoundName, 0, i + 1), parent, this);
 338 //                      parent.addPackage(packageBinding);
 339 //              }
 340 //      }
 341 //      return packageBinding;
 342 }
 343 /* Answer the type for the compoundName if it exists in the cache.
 344 * Answer theNotFoundType if it could not be resolved the first time
 345 * it was looked up, otherwise answer null.
 346 *
 347 * NOTE: Do not use for nested types... the answer is NOT the same for a.b.C or a.b.C.D.E
 348 * assuming C is a type in both cases. In the a.b.C.D.E case, null is the answer.
 349 */
 350
 351 public ReferenceBinding getCachedType(char[][] compoundName) {
 352         if (compoundName.length == 1) {
 353                 if (defaultPackage == null)
 354                         return null;
 355                 return defaultPackage.getType0(compoundName[0]);
 356         }
 357
 358         PackageBinding packageBinding = getPackage0(compoundName[0]);
 359         if (packageBinding == null || packageBinding == TheNotFoundPackage)
 360                 return null;
 361
 362         for (int i = 1, packageLength = compoundName.length - 1; i < packageLength; i++)
 363                 if ((packageBinding = packageBinding.getPackage0(compoundName[i])) == null || packageBinding == TheNotFoundPackage)
 364                         return null;
 365         return packageBinding.getType0(compoundName[compoundName.length - 1]);
 366 }
 367 /* Answer the top level package named name if it exists in the cache.
 368 * Answer theNotFoundPackage if it could not be resolved the first time
 369 * it was looked up, otherwise answer null.
 370 *
 371 * NOTE: Senders must convert theNotFoundPackage into a real problem
 372 * package if its to returned.
 373 */
 374
 375 PackageBinding getPackage0(char[] name) {
 376         return knownPackages.get(name);
 377 }
 378 /* Answer the top level package named name.
 379 * Ask the oracle for the package if its not in the cache.
 380 * Answer null if the package cannot be found.
 381 */
 382
 383 PackageBinding getTopLevelPackage(char[] name) {
 384         PackageBinding packageBinding = getPackage0(name);
 385         if (packageBinding != null) {
 386                 if (packageBinding == TheNotFoundPackage)
 387                         return null;
 388                 else
 389                         return packageBinding;
 390         }
 391
 392         if (nameEnvironment.isPackage(null, name)) {
 393                 knownPackages.put(name, packageBinding = new PackageBinding(name, this));
 394                 return packageBinding;
 395         }
 396
 397         knownPackages.put(name, TheNotFoundPackage); // saves asking the oracle next time
 398         return null;
 399 }
 400 /* Answer the type corresponding to the compoundName.
 401 * Ask the oracle for the type if its not in the cache.
 402 * Answer null if the type cannot be found... likely a fatal error.
 403 */
 404
 405 public ReferenceBinding getType(char[][] compoundName) {
 406         ReferenceBinding referenceBinding;
 407
 408         if (compoundName.length == 1) {
 409                 if (defaultPackage == null)
 410                         return null;
 411
 412                 if ((referenceBinding = defaultPackage.getType0(compoundName[0])) == null) {
 413                         PackageBinding packageBinding = getPackage0(compoundName[0]);
 414                         if (packageBinding != null && packageBinding != TheNotFoundPackage)
 415                                 return null; // collides with a known package... should not call this method in such a case
 416                         referenceBinding = askForType(defaultPackage, compoundName[0]);
 417                 }
 418         } else {
 419                 PackageBinding packageBinding = getPackage0(compoundName[0]);
 420                 if (packageBinding == TheNotFoundPackage)
 421                         return null;
 422
 423                 if (packageBinding != null) {
 424                         for (int i = 1, packageLength = compoundName.length - 1; i < packageLength; i++) {
 425                                 if ((packageBinding = packageBinding.getPackage0(compoundName[i])) == null)
 426                                         break;
 427                                 if (packageBinding == TheNotFoundPackage)
 428                                         return null;
 429                         }
 430                 }
 431
 432                 if (packageBinding == null)
 433                         referenceBinding = askForType(compoundName);
 434                 else if ((referenceBinding = packageBinding.getType0(compoundName[compoundName.length - 1])) == null)
 435                         referenceBinding = askForType(packageBinding, compoundName[compoundName.length - 1]);
 436         }
 437
 438         if (referenceBinding == null || referenceBinding == TheNotFoundType)
 439                 return null;
 440         if (referenceBinding instanceof UnresolvedReferenceBinding)
 441                 referenceBinding = ((UnresolvedReferenceBinding) referenceBinding).resolve(this);
 442
 443         // compoundName refers to a nested type incorrectly (for example, package1.A$B)
 444         if (referenceBinding.isNestedType())
 445                 return new ProblemReferenceBinding(compoundName, InternalNameProvided);
 446         else
 447                 return referenceBinding;
 448 }
 449 /* Answer the type corresponding to the name from the binary file.
 450 * Does not ask the oracle for the type if its not found in the cache... instead an
 451 * unresolved type is returned which must be resolved before used.
 452 *
 453 * NOTE: Does NOT answer base types nor array types!
 454 *
 455 * NOTE: Aborts compilation if the class file cannot be found.
 456 */
 457
 458 ReferenceBinding getTypeFromConstantPoolName(char[] signature, int start, int end) {
 459         if (end == -1)
 460                 end = signature.length;
 461
 462         char[][] compoundName = CharOperation.splitOn('/', signature, start, end);
 463         ReferenceBinding binding = getCachedType(compoundName);
 464         if (binding == null) {
 465                 PackageBinding packageBinding = computePackageFrom(compoundName);
 466                 binding = new UnresolvedReferenceBinding(compoundName, packageBinding);
 467                 packageBinding.addType(binding);
 468         } else if (binding == TheNotFoundType) {
 469                 problemReporter.isClassPathCorrect(compoundName, null);
 470                 return null; // will not get here since the above error aborts the compilation
 471         }
 472         return binding;
 473 }
 474 /* Answer the type corresponding to the signature from the binary file.
 475 * Does not ask the oracle for the type if its not found in the cache... instead an
 476 * unresolved type is returned which must be resolved before used.
 477 *
 478 * NOTE: Does answer base types & array types.
 479 *
 480 * NOTE: Aborts compilation if the class file cannot be found.
 481 */
 482
 483 TypeBinding getTypeFromSignature(char[] signature, int start, int end) {
 484         int dimension = 0;
 485         while (signature[start] == '[') {
 486                 start++;
 487                 dimension++;
 488         }
 489         if (end == -1)
 490                 end = signature.length - 1;
 491
 492         // Just switch on signature[start] - the L case is the else
 493         TypeBinding binding = null;
 494         if (start == end) {
 495                 switch (signature[start]) {
 496                         case 'I' :
 497                                 binding = IntBinding;
 498                                 break;
 499                         case 'Z' :
 500                                 binding = BooleanBinding;
 501                                 break;
 502                         case 'V' :
 503                                 binding = VoidBinding;
 504                                 break;
 505                         case 'C' :
 506                                 binding = CharBinding;
 507                                 break;
 508                         case 'D' :
 509                                 binding = DoubleBinding;
 510                                 break;
 511                         case 'B' :
 512                                 binding = ByteBinding;
 513                                 break;
 514                         case 'F' :
 515                                 binding = FloatBinding;
 516                                 break;
 517                         case 'J' :
 518                                 binding = LongBinding;
 519                                 break;
 520                         case 'S' :
 521                                 binding = ShortBinding;
 522                                 break;
 523                         default :
 524                                 throw new Error(Util.bind("error.undefinedBaseType",String.valueOf(signature[start]))); //$NON-NLS-1$
 525                 }
 526         } else {
 527                 binding = getTypeFromConstantPoolName(signature, start + 1, end);
 528         }
 529
 530         if (dimension == 0)
 531                 return binding;
 532         else
 533                 return createArrayType(binding, dimension);
 534 }
 535 /* Ask the oracle if a package exists named name in the package named compoundName.
 536 */
 537
 538 boolean isPackage(char[][] compoundName, char[] name) {
 539         if (compoundName == null || compoundName.length == 0)
 540                 return nameEnvironment.isPackage(null, name);
 541         else
 542                 return nameEnvironment.isPackage(compoundName, name);
 543 }
 544 // The method verifier is lazily initialized to guarantee the receiver, the compiler & the oracle are ready.
 545
 546 public MethodVerifier methodVerifier() {
 547         if (verifier == null)
 548                 verifier = new MethodVerifier(this);
 549         return verifier;
 550 }
 551 public void reset() {
 552         this.defaultPackage = new PackageBinding(this); // assume the default package always exists
 553         this.defaultImports = null;
 554         this.knownPackages = new HashtableOfPackage();
 555
 556         this.verifier = null;
 557         for (int i = this.uniqueArrayBindings.length; --i >= 0;)
 558                 this.uniqueArrayBindings[i] = null;
 559         this.uniqueArrayBindings[0] = new ArrayBinding[50]; // start off the most common 1 dimension array @ 50
 560
 561         for (int i = this.units.length; --i >= 0;)
 562                 this.units[i] = null;
 563         this.lastUnitIndex = -1;
 564         this.lastCompletedUnitIndex = -1;
 565
 566         // name environment has a longer life cycle, and must be reset in
 567         // the code which created it.
 568 }
 569 void updateArrayCache(UnresolvedReferenceBinding unresolvedType, ReferenceBinding resolvedType) {
 570         nextDimension : for (int i = 0, length = uniqueArrayBindings.length; i < length; i++) {
 571                 ArrayBinding[] arrayBindings = uniqueArrayBindings[i];
 572                 if (arrayBindings != null) {
 573                         for (int j = 0, max = arrayBindings.length; j < max; j++) {
 574                                 ArrayBinding currentBinding = arrayBindings[j];
 575                                 if (currentBinding == null)
 576                                         continue nextDimension;
 577                                 if (currentBinding.leafComponentType == unresolvedType) {
 578                                         currentBinding.leafComponentType = resolvedType;
 579                                         continue nextDimension;
 580                                 }
 581                         }
 582                 }
 583         }
 584 }
 585 }