net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/lookup/BlockScope.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.AbstractMethodDeclaration;
  15 import net.sourceforge.phpdt.internal.compiler.ast.ConstructorDeclaration;
  16 import net.sourceforge.phpdt.internal.compiler.ast.TypeDeclaration;
  17 import net.sourceforge.phpdt.internal.compiler.problem.ProblemReporter;
  18
  19 public class BlockScope extends Scope {
  20
  21         // Local variable management
  22         public LocalVariableBinding[] locals;
  23         public int localIndex; // position for next variable
  24         public int startIndex;  // start position in this scope - for ordering scopes vs. variables
  25         public int offset; // for variable allocation throughout scopes
  26         public int maxOffset; // for variable allocation throughout scopes
  27
  28         // finally scopes must be shifted behind respective try&catch scope(s) so as to avoid
  29         // collisions of secret variables (return address, save value).
  30         public BlockScope[] shiftScopes;
  31
  32         public final static VariableBinding[] EmulationPathToImplicitThis = {};
  33         public final static VariableBinding[] NoEnclosingInstanceInConstructorCall = {};
  34         public final static VariableBinding[] NoEnclosingInstanceInStaticContext = {};
  35
  36         public Scope[] subscopes = new Scope[1]; // need access from code assist
  37         public int scopeIndex = 0; // need access from code assist
  38
  39         protected BlockScope(int kind, Scope parent) {
  40
  41                 super(kind, parent);
  42         }
  43
  44         public BlockScope(BlockScope parent) {
  45
  46                 this(parent, true);
  47         }
  48
  49         public BlockScope(BlockScope parent, boolean addToParentScope) {
  50
  51                 this(BLOCK_SCOPE, parent);
  52                 locals = new LocalVariableBinding[5];
  53                 if (addToParentScope) parent.addSubscope(this);
  54                 this.startIndex = parent.localIndex;
  55         }
  56
  57         public BlockScope(BlockScope parent, int variableCount) {
  58
  59                 this(BLOCK_SCOPE, parent);
  60                 locals = new LocalVariableBinding[variableCount];
  61                 parent.addSubscope(this);
  62                 this.startIndex = parent.localIndex;
  63         }
  64
  65         /* Create the class scope & binding for the anonymous type.
  66          */
  67         public final void addAnonymousType(
  68                 TypeDeclaration anonymousType,
  69                 ReferenceBinding superBinding) {
  70
  71                 ClassScope anonymousClassScope = new ClassScope(this, anonymousType);
  72                 anonymousClassScope.buildAnonymousTypeBinding(
  73                         enclosingSourceType(),
  74                         superBinding);
  75         }
  76
  77         /* Create the class scope & binding for the local type.
  78          */
  79         public final void addLocalType(TypeDeclaration localType) {
  80
  81                 // check that the localType does not conflict with an enclosing type
  82                 ReferenceBinding type = enclosingSourceType();
  83                 do {
  84                         if (CharOperation.equals(type.sourceName, localType.name)) {
  85                                 problemReporter().hidingEnclosingType(localType);
  86                                 return;
  87                         }
  88                         type = type.enclosingType();
  89                 } while (type != null);
  90
  91                 // check that the localType does not conflict with another sibling local type
  92                 Scope scope = this;
  93                 do {
  94                         if (((BlockScope) scope).findLocalType(localType.name) != null) {
  95                                 problemReporter().duplicateNestedType(localType);
  96                                 return;
  97                         }
  98                 } while ((scope = scope.parent) instanceof BlockScope);
  99
 100                 ClassScope localTypeScope = new ClassScope(this, localType);
 101                 addSubscope(localTypeScope);
 102                 localTypeScope.buildLocalTypeBinding(enclosingSourceType());
 103         }
 104
 105         /* Insert a local variable into a given scope, updating its position
 106          * and checking there are not too many locals or arguments allocated.
 107          */
 108         public final void addLocalVariable(LocalVariableBinding binding) {
 109
 110                 checkAndSetModifiersForVariable(binding);
 111
 112                 // insert local in scope
 113                 if (localIndex == locals.length)
 114                         System.arraycopy(
 115                                 locals,
 116                                 0,
 117                                 (locals = new LocalVariableBinding[localIndex * 2]),
 118                                 0,
 119                                 localIndex);
 120                 locals[localIndex++] = binding;
 121
 122                 // update local variable binding
 123                 binding.declaringScope = this;
 124                 binding.id = this.outerMostMethodScope().analysisIndex++;
 125                 // share the outermost method scope analysisIndex
 126         }
 127
 128         public void addSubscope(Scope childScope) {
 129                 if (scopeIndex == subscopes.length)
 130                         System.arraycopy(
 131                                 subscopes,
 132                                 0,
 133                                 (subscopes = new Scope[scopeIndex * 2]),
 134                                 0,
 135                                 scopeIndex);
 136                 subscopes[scopeIndex++] = childScope;
 137         }
 138
 139         /* Answer true if the receiver is suitable for assigning final blank fields.
 140          *
 141          * in other words, it is inside an initializer, a constructor or a clinit
 142          */
 143         public final boolean allowBlankFinalFieldAssignment(FieldBinding binding) {
 144
 145                 if (enclosingSourceType() != binding.declaringClass)
 146                         return false;
 147
 148                 MethodScope methodScope = methodScope();
 149                 if (methodScope.isStatic != binding.isStatic())
 150                         return false;
 151                 return methodScope.isInsideInitializer() // inside initializer
 152                                 || ((AbstractMethodDeclaration) methodScope.referenceContext)
 153                                         .isInitializationMethod(); // inside constructor or clinit
 154         }
 155         String basicToString(int tab) {
 156                 String newLine = "\n"; //$NON-NLS-1$
 157                 for (int i = tab; --i >= 0;)
 158                         newLine += "\t"; //$NON-NLS-1$
 159
 160                 String s = newLine + "--- Block Scope ---"; //$NON-NLS-1$
 161                 newLine += "\t"; //$NON-NLS-1$
 162                 s += newLine + "locals:"; //$NON-NLS-1$
 163                 for (int i = 0; i < localIndex; i++)
 164                         s += newLine + "\t" + locals[i].toString(); //$NON-NLS-1$
 165                 s += newLine + "startIndex = " + startIndex; //$NON-NLS-1$
 166                 return s;
 167         }
 168
 169         private void checkAndSetModifiersForVariable(LocalVariableBinding varBinding) {
 170
 171                 int modifiers = varBinding.modifiers;
 172                 if ((modifiers & AccAlternateModifierProblem) != 0 && varBinding.declaration != null){
 173                         problemReporter().duplicateModifierForVariable(varBinding.declaration, this instanceof MethodScope);
 174                 }
 175                 int realModifiers = modifiers & AccJustFlag;
 176
 177                 int unexpectedModifiers = ~AccFinal;
 178                 if ((realModifiers & unexpectedModifiers) != 0 && varBinding.declaration != null){
 179                         problemReporter().illegalModifierForVariable(varBinding.declaration, this instanceof MethodScope);
 180                 }
 181                 varBinding.modifiers = modifiers;
 182         }
 183
 184         /* Compute variable positions in scopes given an initial position offset
 185          * ignoring unused local variables.
 186          *
 187          * No argument is expected here (ilocal is the first non-argument local of the outermost scope)
 188          * Arguments are managed by the MethodScope method
 189          */
 190 //      void computeLocalVariablePositions(int ilocal, int initOffset, CodeStream codeStream) {
 191 //
 192 //              this.offset = initOffset;
 193 //              this.maxOffset = initOffset;
 194 //
 195 //              // local variable init
 196 //              int maxLocals = this.localIndex;
 197 //              boolean hasMoreVariables = ilocal < maxLocals;
 198 //
 199 //              // scope init
 200 //              int iscope = 0, maxScopes = this.scopeIndex;
 201 //              boolean hasMoreScopes = maxScopes > 0;
 202 //
 203 //              // iterate scopes and variables in parallel
 204 //              while (hasMoreVariables || hasMoreScopes) {
 205 //                      if (hasMoreScopes
 206 //                              && (!hasMoreVariables || (subscopes[iscope].startIndex() <= ilocal))) {
 207 //                              // consider subscope first
 208 //                              if (subscopes[iscope] instanceof BlockScope) {
 209 //                                      BlockScope subscope = (BlockScope) subscopes[iscope];
 210 //                                      int subOffset = subscope.shiftScopes == null ? this.offset : subscope.maxShiftedOffset();
 211 //                                      subscope.computeLocalVariablePositions(0, subOffset, codeStream);
 212 //                                      if (subscope.maxOffset > this.maxOffset)
 213 //                                              this.maxOffset = subscope.maxOffset;
 214 //                              }
 215 //                              hasMoreScopes = ++iscope < maxScopes;
 216 //                      } else {
 217 //
 218 //                              // consider variable first
 219 //                              LocalVariableBinding local = locals[ilocal]; // if no local at all, will be locals[ilocal]==null
 220 //
 221 //                              // check if variable is actually used, and may force it to be preserved
 222 //                              boolean generateCurrentLocalVar = (local.useFlag == LocalVariableBinding.USED && (local.constant == Constant.NotAConstant));
 223 //
 224 //                              // do not report fake used variable
 225 //                              if (local.useFlag == LocalVariableBinding.UNUSED
 226 //                                      && (local.declaration != null) // unused (and non secret) local
 227 //                                      && ((local.declaration.bits & ASTNode.IsLocalDeclarationReachableMASK) != 0)) { // declaration is reachable
 228 //
 229 //                                      if (!(local.declaration instanceof Argument))  // do not report unused catch arguments
 230 //                                              this.problemReporter().unusedLocalVariable(local.declaration);
 231 //                              }
 232 //
 233 //                              // could be optimized out, but does need to preserve unread variables ?
 234 ////                            if (!generateCurrentLocalVar) {
 235 ////                                    if (local.declaration != null && environment().options.preserveAllLocalVariables) {
 236 ////                                            generateCurrentLocalVar = true; // force it to be preserved in the generated code
 237 ////                                            local.useFlag = LocalVariableBinding.USED;
 238 ////                                    }
 239 ////                            }
 240 //
 241 //                              // allocate variable
 242 //                              if (generateCurrentLocalVar) {
 243 //
 244 //                                      if (local.declaration != null) {
 245 //                                              codeStream.record(local); // record user-defined local variables for attribute generation
 246 //                                      }
 247 //                                      // assign variable position
 248 //                                      local.resolvedPosition = this.offset;
 249 //
 250 //                                      if ((local.type == LongBinding) || (local.type == DoubleBinding)) {
 251 //                                              this.offset += 2;
 252 //                                      } else {
 253 //                                              this.offset++;
 254 //                                      }
 255 //                                      if (this.offset > 0xFFFF) { // no more than 65535 words of locals
 256 //                                              this.problemReporter().noMoreAvailableSpaceForLocal(
 257 //                                                      local,
 258 //                                                      local.declaration == null ? (ASTNode)this.methodScope().referenceContext : local.declaration);
 259 //                                      }
 260 //                              } else {
 261 //                                      local.resolvedPosition = -1; // not generated
 262 //                              }
 263 //                              hasMoreVariables = ++ilocal < maxLocals;
 264 //                      }
 265 //              }
 266 //              if (this.offset > this.maxOffset)
 267 //                      this.maxOffset = this.offset;
 268 //      }
 269
 270         /* Answer true if the variable name already exists within the receiver's scope.
 271          */
 272         public final LocalVariableBinding duplicateName(char[] name) {
 273                 for (int i = 0; i < localIndex; i++)
 274                         if (CharOperation.equals(name, locals[i].name))
 275                                 return locals[i];
 276
 277                 if (this instanceof MethodScope)
 278                         return null;
 279                 else
 280                         return ((BlockScope) parent).duplicateName(name);
 281         }
 282
 283         /*
 284          *      Record the suitable binding denoting a synthetic field or constructor argument,
 285          * mapping to the actual outer local variable in the scope context.
 286          * Note that this may not need any effect, in case the outer local variable does not
 287          * need to be emulated and can directly be used as is (using its back pointer to its
 288          * declaring scope).
 289          */
 290         public void emulateOuterAccess(LocalVariableBinding outerLocalVariable) {
 291
 292                 MethodScope currentMethodScope;
 293                 if ((currentMethodScope = this.methodScope())
 294                         != outerLocalVariable.declaringScope.methodScope()) {
 295                         NestedTypeBinding currentType = (NestedTypeBinding) this.enclosingSourceType();
 296
 297                         //do nothing for member types, pre emulation was performed already
 298                         if (!currentType.isLocalType()) {
 299                                 return;
 300                         }
 301                         // must also add a synthetic field if we're not inside a constructor
 302                         if (!currentMethodScope.isInsideInitializerOrConstructor()) {
 303                                 currentType.addSyntheticArgumentAndField(outerLocalVariable);
 304                         } else {
 305                                 currentType.addSyntheticArgument(outerLocalVariable);
 306                         }
 307                 }
 308         }
 309
 310         /* Note that it must never produce a direct access to the targetEnclosingType,
 311          * but instead a field sequence (this$2.this$1.this$0) so as to handle such a test case:
 312          *
 313          * class XX {
 314          *      void foo() {
 315          *              class A {
 316          *                      class B {
 317          *                              class C {
 318          *                                      boolean foo() {
 319          *                                              return (Object) A.this == (Object) B.this;
 320          *                                      }
 321          *                              }
 322          *                      }
 323          *              }
 324          *              new A().new B().new C();
 325          *      }
 326          * }
 327          * where we only want to deal with ONE enclosing instance for C (could not figure out an A for C)
 328          */
 329         public final ReferenceBinding findLocalType(char[] name) {
 330
 331                 for (int i = 0, length = scopeIndex; i < length; i++) {
 332                         if (subscopes[i] instanceof ClassScope) {
 333                                 SourceTypeBinding sourceType =
 334                                         ((ClassScope) subscopes[i]).referenceContext.binding;
 335                                 if (CharOperation.equals(sourceType.sourceName(), name))
 336                                         return sourceType;
 337                         }
 338                 }
 339                 return null;
 340         }
 341
 342         public LocalVariableBinding findVariable(char[] variable) {
 343
 344                 int variableLength = variable.length;
 345                 for (int i = 0, length = locals.length; i < length; i++) {
 346                         LocalVariableBinding local = locals[i];
 347                         if (local == null)
 348                                 return null;
 349                         if (local.name.length == variableLength
 350                                 && CharOperation.prefixEquals(local.name, variable))
 351                                 return local;
 352                 }
 353                 return null;
 354         }
 355         /* API
 356      * flag is a mask of the following values VARIABLE (= FIELD or LOCAL), TYPE.
 357          * Only bindings corresponding to the mask will be answered.
 358          *
 359          *      if the VARIABLE mask is set then
 360          *              If the first name provided is a field (or local) then the field (or local) is answered
 361          *              Otherwise, package names and type names are consumed until a field is found.
 362          *              In this case, the field is answered.
 363          *
 364          *      if the TYPE mask is set,
 365          *              package names and type names are consumed until the end of the input.
 366          *              Only if all of the input is consumed is the type answered
 367          *
 368          *      All other conditions are errors, and a problem binding is returned.
 369          *
 370          *      NOTE: If a problem binding is returned, senders should extract the compound name
 371          *      from the binding & not assume the problem applies to the entire compoundName.
 372          *
 373          *      The VARIABLE mask has precedence over the TYPE mask.
 374          *
 375          *      InvocationSite implements
 376          *              isSuperAccess(); this is used to determine if the discovered field is visible.
 377          *              setFieldIndex(int); this is used to record the number of names that were consumed.
 378          *
 379          *      For example, getBinding({"foo","y","q", VARIABLE, site) will answer
 380          *      the binding for the field or local named "foo" (or an error binding if none exists).
 381          *      In addition, setFieldIndex(1) will be sent to the invocation site.
 382          *      If a type named "foo" exists, it will not be detected (and an error binding will be answered)
 383          *
 384          *      IMPORTANT NOTE: This method is written under the assumption that compoundName is longer than length 1.
 385          */
 386         public Binding getBinding(char[][] compoundName, int mask, InvocationSite invocationSite) {
 387
 388                 Binding binding = getBinding(compoundName[0], mask | TYPE | PACKAGE, invocationSite);
 389                 invocationSite.setFieldIndex(1);
 390                 if (binding instanceof VariableBinding) return binding;
 391                 compilationUnitScope().recordSimpleReference(compoundName[0]);
 392                 if (!binding.isValidBinding()) return binding;
 393
 394                 int length = compoundName.length;
 395                 int currentIndex = 1;
 396                 foundType : if (binding instanceof PackageBinding) {
 397                         PackageBinding packageBinding = (PackageBinding) binding;
 398                         while (currentIndex < length) {
 399                                 compilationUnitScope().recordReference(packageBinding.compoundName, compoundName[currentIndex]);
 400                                 binding = packageBinding.getTypeOrPackage(compoundName[currentIndex++]);
 401                                 invocationSite.setFieldIndex(currentIndex);
 402                                 if (binding == null) {
 403                                         if (currentIndex == length)
 404                                                 // must be a type if its the last name, otherwise we have no idea if its a package or type
 405                                                 return new ProblemReferenceBinding(
 406                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 407                                                         NotFound);
 408                                         else
 409                                                 return new ProblemBinding(
 410                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 411                                                         NotFound);
 412                                 }
 413                                 if (binding instanceof ReferenceBinding) {
 414                                         if (!binding.isValidBinding())
 415                                                 return new ProblemReferenceBinding(
 416                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 417                                                         binding.problemId());
 418                                         if (!((ReferenceBinding) binding).canBeSeenBy(this))
 419                                                 return new ProblemReferenceBinding(
 420                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 421                                                         (ReferenceBinding)binding,
 422                                                         NotVisible);
 423                                         break foundType;
 424                                 }
 425                                 packageBinding = (PackageBinding) binding;
 426                         }
 427
 428                         // It is illegal to request a PACKAGE from this method.
 429                         return new ProblemReferenceBinding(
 430                                 CharOperation.subarray(compoundName, 0, currentIndex),
 431                                 NotFound);
 432                 }
 433
 434                 // know binding is now a ReferenceBinding
 435                 while (currentIndex < length) {
 436                         ReferenceBinding typeBinding = (ReferenceBinding) binding;
 437                         char[] nextName = compoundName[currentIndex++];
 438                         invocationSite.setFieldIndex(currentIndex);
 439                         invocationSite.setActualReceiverType(typeBinding);
 440                         if ((mask & FIELD) != 0 && (binding = findField(typeBinding, nextName, invocationSite)) != null) {
 441                                 if (!binding.isValidBinding())
 442                                         return new ProblemFieldBinding(
 443                                                 ((FieldBinding) binding).declaringClass,
 444                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 445                                                 binding.problemId());
 446                                 break; // binding is now a field
 447                         }
 448                         if ((binding = findMemberType(nextName, typeBinding)) == null) {
 449                                 if ((mask & FIELD) != 0) {
 450                                         return new ProblemBinding(
 451                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 452                                                 typeBinding,
 453                                                 NotFound);
 454                                 } else {
 455                                         return new ProblemReferenceBinding(
 456                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 457                                                 typeBinding,
 458                                                 NotFound);
 459                                 }
 460                         }
 461                         if (!binding.isValidBinding())
 462                                 return new ProblemReferenceBinding(
 463                                         CharOperation.subarray(compoundName, 0, currentIndex),
 464                                         binding.problemId());
 465                 }
 466
 467                 if ((mask & FIELD) != 0 && (binding instanceof FieldBinding)) {
 468                         // was looking for a field and found a field
 469                         FieldBinding field = (FieldBinding) binding;
 470                         if (!field.isStatic())
 471                                 return new ProblemFieldBinding(
 472                                         field.declaringClass,
 473                                         CharOperation.subarray(compoundName, 0, currentIndex),
 474                                         NonStaticReferenceInStaticContext);
 475                         return binding;
 476                 }
 477                 if ((mask & TYPE) != 0 && (binding instanceof ReferenceBinding)) {
 478                         // was looking for a type and found a type
 479                         return binding;
 480                 }
 481
 482                 // handle the case when a field or type was asked for but we resolved the compoundName to a type or field
 483                 return new ProblemBinding(
 484                         CharOperation.subarray(compoundName, 0, currentIndex),
 485                         NotFound);
 486         }
 487
 488         // Added for code assist... NOT Public API
 489         public final Binding getBinding(
 490                 char[][] compoundName,
 491                 InvocationSite invocationSite) {
 492                 int currentIndex = 0;
 493                 int length = compoundName.length;
 494                 Binding binding =
 495                         getBinding(
 496                                 compoundName[currentIndex++],
 497                                 VARIABLE | TYPE | PACKAGE,
 498                                 invocationSite);
 499                 if (!binding.isValidBinding())
 500                         return binding;
 501
 502                 foundType : if (binding instanceof PackageBinding) {
 503                         while (currentIndex < length) {
 504                                 PackageBinding packageBinding = (PackageBinding) binding;
 505                                 binding = packageBinding.getTypeOrPackage(compoundName[currentIndex++]);
 506                                 if (binding == null) {
 507                                         if (currentIndex == length)
 508                                                 // must be a type if its the last name, otherwise we have no idea if its a package or type
 509                                                 return new ProblemReferenceBinding(
 510                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 511                                                         NotFound);
 512                                         else
 513                                                 return new ProblemBinding(
 514                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 515                                                         NotFound);
 516                                 }
 517                                 if (binding instanceof ReferenceBinding) {
 518                                         if (!binding.isValidBinding())
 519                                                 return new ProblemReferenceBinding(
 520                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 521                                                         binding.problemId());
 522                                         if (!((ReferenceBinding) binding).canBeSeenBy(this))
 523                                                 return new ProblemReferenceBinding(
 524                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 525                                                         (ReferenceBinding)binding,
 526                                                         NotVisible);
 527                                         break foundType;
 528                                 }
 529                         }
 530                         return binding;
 531                 }
 532
 533                 foundField : if (binding instanceof ReferenceBinding) {
 534                         while (currentIndex < length) {
 535                                 ReferenceBinding typeBinding = (ReferenceBinding) binding;
 536                                 char[] nextName = compoundName[currentIndex++];
 537                                 if ((binding = findField(typeBinding, nextName, invocationSite)) != null) {
 538                                         if (!binding.isValidBinding())
 539                                                 return new ProblemFieldBinding(
 540                                                         ((FieldBinding) binding).declaringClass,
 541                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 542                                                         binding.problemId());
 543                                         if (!((FieldBinding) binding).isStatic())
 544                                                 return new ProblemFieldBinding(
 545                                                         ((FieldBinding) binding).declaringClass,
 546                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 547                                                         NonStaticReferenceInStaticContext);
 548                                         break foundField; // binding is now a field
 549                                 }
 550                                 if ((binding = findMemberType(nextName, typeBinding)) == null)
 551                                         return new ProblemBinding(
 552                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 553                                                 typeBinding,
 554                                                 NotFound);
 555                                 if (!binding.isValidBinding())
 556                                         return new ProblemReferenceBinding(
 557                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 558                                                 binding.problemId());
 559                         }
 560                         return binding;
 561                 }
 562
 563                 VariableBinding variableBinding = (VariableBinding) binding;
 564                 while (currentIndex < length) {
 565                         TypeBinding typeBinding = variableBinding.type;
 566                         if (typeBinding == null)
 567                                 return new ProblemFieldBinding(
 568                                         null,
 569                                         CharOperation.subarray(compoundName, 0, currentIndex + 1),
 570                                         NotFound);
 571                         variableBinding =
 572                                 findField(typeBinding, compoundName[currentIndex++], invocationSite);
 573                         if (variableBinding == null)
 574                                 return new ProblemFieldBinding(
 575                                         null,
 576                                         CharOperation.subarray(compoundName, 0, currentIndex),
 577                                         NotFound);
 578                         if (!variableBinding.isValidBinding())
 579                                 return variableBinding;
 580                 }
 581                 return variableBinding;
 582         }
 583
 584         /* API
 585      *
 586          *      Answer the binding that corresponds to the argument name.
 587          *      flag is a mask of the following values VARIABLE (= FIELD or LOCAL), TYPE, PACKAGE.
 588          *      Only bindings corresponding to the mask can be answered.
 589          *
 590          *      For example, getBinding("foo", VARIABLE, site) will answer
 591          *      the binding for the field or local named "foo" (or an error binding if none exists).
 592          *      If a type named "foo" exists, it will not be detected (and an error binding will be answered)
 593          *
 594          *      The VARIABLE mask has precedence over the TYPE mask.
 595          *
 596          *      If the VARIABLE mask is not set, neither fields nor locals will be looked for.
 597          *
 598          *      InvocationSite implements:
 599          *              isSuperAccess(); this is used to determine if the discovered field is visible.
 600          *
 601          *      Limitations: cannot request FIELD independently of LOCAL, or vice versa
 602          */
 603         public Binding getBinding(char[] name, int mask, InvocationSite invocationSite) {
 604
 605                 Binding binding = null;
 606                 FieldBinding problemField = null;
 607                 if ((mask & VARIABLE) != 0) {
 608                         if (this.kind == BLOCK_SCOPE || this.kind == METHOD_SCOPE) {
 609                                 LocalVariableBinding variableBinding = findVariable(name);
 610                                 // looks in this scope only
 611                                 if (variableBinding != null) return variableBinding;
 612                         }
 613
 614                         boolean insideStaticContext = false;
 615                         boolean insideConstructorCall = false;
 616                         if (this.kind == METHOD_SCOPE) {
 617                                 MethodScope methodScope = (MethodScope) this;
 618                                 insideStaticContext |= methodScope.isStatic;
 619                                 insideConstructorCall |= methodScope.isConstructorCall;
 620                         }
 621
 622                         FieldBinding foundField = null;
 623                         // can be a problem field which is answered if a valid field is not found
 624                         ProblemFieldBinding foundInsideProblem = null;
 625                         // inside Constructor call or inside static context
 626                         Scope scope = parent;
 627                         int depth = 0;
 628                         int foundDepth = 0;
 629                         ReferenceBinding foundActualReceiverType = null;
 630                         done : while (true) { // done when a COMPILATION_UNIT_SCOPE is found
 631                                 switch (scope.kind) {
 632                                         case METHOD_SCOPE :
 633                                                 MethodScope methodScope = (MethodScope) scope;
 634                                                 insideStaticContext |= methodScope.isStatic;
 635                                                 insideConstructorCall |= methodScope.isConstructorCall;
 636                                                 // Fall through... could duplicate the code below to save a cast - questionable optimization
 637                                         case BLOCK_SCOPE :
 638                                                 LocalVariableBinding variableBinding = ((BlockScope) scope).findVariable(name);
 639                                                 // looks in this scope only
 640                                                 if (variableBinding != null) {
 641                                                         if (foundField != null && foundField.isValidBinding())
 642                                                                 return new ProblemFieldBinding(
 643                                                                         foundField.declaringClass,
 644                                                                         name,
 645                                                                         InheritedNameHidesEnclosingName);
 646                                                         if (depth > 0)
 647                                                                 invocationSite.setDepth(depth);
 648                                                         return variableBinding;
 649                                                 }
 650                                                 break;
 651                                         case CLASS_SCOPE :
 652                                                 ClassScope classScope = (ClassScope) scope;
 653                                                 SourceTypeBinding enclosingType = classScope.referenceContext.binding;
 654                                                 FieldBinding fieldBinding =
 655                                                         classScope.findField(enclosingType, name, invocationSite);
 656                                                 // Use next line instead if willing to enable protected access accross inner types
 657                                                 // FieldBinding fieldBinding = findField(enclosingType, name, invocationSite);
 658                                                 if (fieldBinding != null) { // skip it if we did not find anything
 659                                                         if (fieldBinding.problemId() == Ambiguous) {
 660                                                                 if (foundField == null || foundField.problemId() == NotVisible)
 661                                                                         // supercedes any potential InheritedNameHidesEnclosingName problem
 662                                                                         return fieldBinding;
 663                                                                 else
 664                                                                         // make the user qualify the field, likely wants the first inherited field (javac generates an ambiguous error instead)
 665                                                                         return new ProblemFieldBinding(
 666                                                                                 fieldBinding.declaringClass,
 667                                                                                 name,
 668                                                                                 InheritedNameHidesEnclosingName);
 669                                                         }
 670
 671                                                         ProblemFieldBinding insideProblem = null;
 672                                                         if (fieldBinding.isValidBinding()) {
 673                                                                 if (!fieldBinding.isStatic()) {
 674                                                                         if (insideConstructorCall) {
 675                                                                                 insideProblem =
 676                                                                                         new ProblemFieldBinding(
 677                                                                                                 fieldBinding.declaringClass,
 678                                                                                                 name,
 679                                                                                                 NonStaticReferenceInConstructorInvocation);
 680                                                                         } else if (insideStaticContext) {
 681                                                                                 insideProblem =
 682                                                                                         new ProblemFieldBinding(
 683                                                                                                 fieldBinding.declaringClass,
 684                                                                                                 name,
 685                                                                                                 NonStaticReferenceInStaticContext);
 686                                                                         }
 687                                                                 }
 688 //                                                              if (enclosingType == fieldBinding.declaringClass
 689 //                                                                      || environment().options.complianceLevel >= CompilerOptions.JDK1_4){
 690 //                                                                      // found a valid field in the 'immediate' scope (ie. not inherited)
 691 //                                                                      // OR in 1.4 mode (inherited shadows enclosing)
 692 //                                                                      if (foundField == null) {
 693 //                                                                              if (depth > 0){
 694 //                                                                                      invocationSite.setDepth(depth);
 695 //                                                                                      invocationSite.setActualReceiverType(enclosingType);
 696 //                                                                              }
 697 //                                                                              // return the fieldBinding if it is not declared in a superclass of the scope's binding (that is, inherited)
 698 //                                                                              return insideProblem == null ? fieldBinding : insideProblem;
 699 //                                                                      }
 700 //                                                                      if (foundField.isValidBinding())
 701 //                                                                              // if a valid field was found, complain when another is found in an 'immediate' enclosing type (that is, not inherited)
 702 //                                                                              if (foundField.declaringClass != fieldBinding.declaringClass)
 703 //                                                                                      // ie. have we found the same field - do not trust field identity yet
 704 //                                                                                      return new ProblemFieldBinding(
 705 //                                                                                              fieldBinding.declaringClass,
 706 //                                                                                              name,
 707 //                                                                                              InheritedNameHidesEnclosingName);
 708 //                                                              }
 709                                                         }
 710
 711                                                         if (foundField == null
 712                                                                 || (foundField.problemId() == NotVisible
 713                                                                         && fieldBinding.problemId() != NotVisible)) {
 714                                                                 // only remember the fieldBinding if its the first one found or the previous one was not visible & fieldBinding is...
 715                                                                 foundDepth = depth;
 716                                                                 foundActualReceiverType = enclosingType;
 717                                                                 foundInsideProblem = insideProblem;
 718                                                                 foundField = fieldBinding;
 719                                                         }
 720                                                 }
 721                                                 depth++;
 722                                                 insideStaticContext |= enclosingType.isStatic();
 723                                                 // 1EX5I8Z - accessing outer fields within a constructor call is permitted
 724                                                 // in order to do so, we change the flag as we exit from the type, not the method
 725                                                 // itself, because the class scope is used to retrieve the fields.
 726                                                 MethodScope enclosingMethodScope = scope.methodScope();
 727                                                 insideConstructorCall =
 728                                                         enclosingMethodScope == null ? false : enclosingMethodScope.isConstructorCall;
 729                                                 break;
 730                                         case COMPILATION_UNIT_SCOPE :
 731                                                 break done;
 732                                 }
 733                                 scope = scope.parent;
 734                         }
 735
 736                         if (foundInsideProblem != null){
 737                                 return foundInsideProblem;
 738                         }
 739                         if (foundField != null) {
 740                                 if (foundField.isValidBinding()){
 741                                         if (foundDepth > 0){
 742                                                 invocationSite.setDepth(foundDepth);
 743                                                 invocationSite.setActualReceiverType(foundActualReceiverType);
 744                                         }
 745                                         return foundField;
 746                                 }
 747                                 problemField = foundField;
 748                         }
 749                 }
 750
 751                 // We did not find a local or instance variable.
 752                 if ((mask & TYPE) != 0) {
 753                         if ((binding = getBaseType(name)) != null)
 754                                 return binding;
 755                         binding = getTypeOrPackage(name, (mask & PACKAGE) == 0 ? TYPE : TYPE | PACKAGE);
 756                         if (binding.isValidBinding() || mask == TYPE)
 757                                 return binding;
 758                         // answer the problem type binding if we are only looking for a type
 759                 } else if ((mask & PACKAGE) != 0) {
 760                         compilationUnitScope().recordSimpleReference(name);
 761                         if ((binding = environment().getTopLevelPackage(name)) != null)
 762                                 return binding;
 763                 }
 764                 if (problemField != null)
 765                         return problemField;
 766                 else
 767                         return new ProblemBinding(name, enclosingSourceType(), NotFound);
 768         }
 769
 770         /* API
 771          *
 772          *      Answer the constructor binding that corresponds to receiverType, argumentTypes.
 773          *
 774          *      InvocationSite implements
 775          *              isSuperAccess(); this is used to determine if the discovered constructor is visible.
 776          *
 777          *      If no visible constructor is discovered, an error binding is answered.
 778          */
 779         public MethodBinding getConstructor(
 780                 ReferenceBinding receiverType,
 781                 TypeBinding[] argumentTypes,
 782                 InvocationSite invocationSite) {
 783
 784                 compilationUnitScope().recordTypeReference(receiverType);
 785                 compilationUnitScope().recordTypeReferences(argumentTypes);
 786                 MethodBinding methodBinding = receiverType.getExactConstructor(argumentTypes);
 787                 if (methodBinding != null) {
 788                         if (methodBinding.canBeSeenBy(invocationSite, this))
 789                                 return methodBinding;
 790                 }
 791                 MethodBinding[] methods =
 792                         receiverType.getMethods(ConstructorDeclaration.ConstantPoolName);
 793                 if (methods == NoMethods) {
 794                         return new ProblemMethodBinding(
 795                                 ConstructorDeclaration.ConstantPoolName,
 796                                 argumentTypes,
 797                                 NotFound);
 798                 }
 799                 MethodBinding[] compatible = new MethodBinding[methods.length];
 800                 int compatibleIndex = 0;
 801                 for (int i = 0, length = methods.length; i < length; i++)
 802                         if (areParametersAssignable(methods[i].parameters, argumentTypes))
 803                                 compatible[compatibleIndex++] = methods[i];
 804                 if (compatibleIndex == 0)
 805                         return new ProblemMethodBinding(
 806                                 ConstructorDeclaration.ConstantPoolName,
 807                                 argumentTypes,
 808                                 NotFound);
 809                 // need a more descriptive error... cannot convert from X to Y
 810
 811                 MethodBinding[] visible = new MethodBinding[compatibleIndex];
 812                 int visibleIndex = 0;
 813                 for (int i = 0; i < compatibleIndex; i++) {
 814                         MethodBinding method = compatible[i];
 815                         if (method.canBeSeenBy(invocationSite, this))
 816                                 visible[visibleIndex++] = method;
 817                 }
 818                 if (visibleIndex == 1)
 819                         return visible[0];
 820                 if (visibleIndex == 0)
 821                         return new ProblemMethodBinding(
 822                                 compatible[0],
 823                                 ConstructorDeclaration.ConstantPoolName,
 824                                 compatible[0].parameters,
 825                                 NotVisible);
 826                 return mostSpecificClassMethodBinding(visible, visibleIndex);
 827         }
 828
 829         /*
 830          * This retrieves the argument that maps to an enclosing instance of the suitable type,
 831          *      if not found then answers nil -- do not create one
 832      *
 833          *              #implicitThis                                           : the implicit this will be ok
 834          *              #((arg) this$n)                                         : available as a constructor arg
 835          *              #((arg) this$n ... this$p)                      : available as as a constructor arg + a sequence of fields
 836          *              #((fieldDescr) this$n ... this$p)       : available as a sequence of fields
 837          *              nil                                                                                                     : not found
 838          *
 839          *      Note that this algorithm should answer the shortest possible sequence when
 840          *              shortcuts are available:
 841          *                              this$0 . this$0 . this$0
 842          *              instead of
 843          *                              this$2 . this$1 . this$0 . this$1 . this$0
 844          *              thus the code generation will be more compact and runtime faster
 845          */
 846         public VariableBinding[] getEmulationPath(LocalVariableBinding outerLocalVariable) {
 847
 848                 MethodScope currentMethodScope = this.methodScope();
 849                 SourceTypeBinding sourceType = currentMethodScope.enclosingSourceType();
 850
 851                 // identity check
 852                 if (currentMethodScope == outerLocalVariable.declaringScope.methodScope()) {
 853                         return new VariableBinding[] { outerLocalVariable };
 854                         // implicit this is good enough
 855                 }
 856                 // use synthetic constructor arguments if possible
 857                 if (currentMethodScope.isInsideInitializerOrConstructor()
 858                         && (sourceType.isNestedType())) {
 859                         SyntheticArgumentBinding syntheticArg;
 860                         if ((syntheticArg = ((NestedTypeBinding) sourceType).getSyntheticArgument(outerLocalVariable)) != null) {
 861                                 return new VariableBinding[] { syntheticArg };
 862                         }
 863                 }
 864                 // use a synthetic field then
 865                 if (!currentMethodScope.isStatic) {
 866                         FieldBinding syntheticField;
 867                         if ((syntheticField = sourceType.getSyntheticField(outerLocalVariable)) != null) {
 868                                 return new VariableBinding[] { syntheticField };
 869                         }
 870                 }
 871                 return null;
 872         }
 873
 874         /*
 875          * This retrieves the argument that maps to an enclosing instance of the suitable type,
 876          *      if not found then answers nil -- do not create one
 877          *
 878          *              #implicitThis                                                           :  the implicit this will be ok
 879          *              #((arg) this$n)                                                         : available as a constructor arg
 880          *              #((arg) this$n access$m... access$p)            : available as as a constructor arg + a sequence of synthetic accessors to synthetic fields
 881          *              #((fieldDescr) this$n access#m... access$p)     : available as a first synthetic field + a sequence of synthetic accessors to synthetic fields
 882          *              nil                                                                                                                             : not found
 883          *      jls 15.9.2
 884          */
 885         public Object[] getEmulationPath(
 886                         ReferenceBinding targetEnclosingType,
 887                         boolean onlyExactMatch,
 888                         boolean ignoreEnclosingArgInConstructorCall) {
 889                 //TODO: (philippe) investigate why exactly test76 fails if ignoreEnclosingArgInConstructorCall is always false
 890                 MethodScope currentMethodScope = this.methodScope();
 891                 SourceTypeBinding sourceType = currentMethodScope.enclosingSourceType();
 892
 893                 // identity check
 894                 if (!currentMethodScope.isStatic
 895                         && (!currentMethodScope.isConstructorCall || ignoreEnclosingArgInConstructorCall)
 896                         && (sourceType == targetEnclosingType
 897                                 || (!onlyExactMatch && targetEnclosingType.isSuperclassOf(sourceType)))) {
 898                         if (currentMethodScope.isConstructorCall) {
 899                                 return NoEnclosingInstanceInConstructorCall;
 900                         }
 901                         if (currentMethodScope.isStatic){
 902                                 return NoEnclosingInstanceInStaticContext;
 903                         }
 904                         return EmulationPathToImplicitThis; // implicit this is good enough
 905                 }
 906                 if (!sourceType.isNestedType() || sourceType.isStatic()) { // no emulation from within non-inner types
 907                         if (currentMethodScope.isConstructorCall) {
 908                                 return NoEnclosingInstanceInConstructorCall;
 909                         }
 910                                 if (currentMethodScope.isStatic){
 911                                         return NoEnclosingInstanceInStaticContext;
 912                                 }
 913                         return null;
 914                 }
 915                 boolean insideConstructor = currentMethodScope.isInsideInitializerOrConstructor();
 916                 // use synthetic constructor arguments if possible
 917                 if (insideConstructor) {
 918                         SyntheticArgumentBinding syntheticArg;
 919                         if ((syntheticArg = ((NestedTypeBinding) sourceType).getSyntheticArgument(targetEnclosingType, onlyExactMatch)) != null) {
 920                                 return new Object[] { syntheticArg };
 921                         }
 922                 }
 923
 924                 // use a direct synthetic field then
 925                 if (currentMethodScope.isStatic) {
 926                         return NoEnclosingInstanceInStaticContext;
 927                 }
 928                 FieldBinding syntheticField = sourceType.getSyntheticField(targetEnclosingType, onlyExactMatch);
 929                 if (syntheticField != null) {
 930                         if (currentMethodScope.isConstructorCall){
 931                                 return NoEnclosingInstanceInConstructorCall;
 932                         }
 933                         return new Object[] { syntheticField };
 934                 }
 935                 // could be reached through a sequence of enclosing instance link (nested members)
 936                 Object[] path = new Object[2]; // probably at least 2 of them
 937                 ReferenceBinding currentType = sourceType.enclosingType();
 938                 if (insideConstructor) {
 939                         path[0] = ((NestedTypeBinding) sourceType).getSyntheticArgument((SourceTypeBinding) currentType, onlyExactMatch);
 940                 } else {
 941                         if (currentMethodScope.isConstructorCall){
 942                                 return NoEnclosingInstanceInConstructorCall;
 943                         }
 944                         path[0] = sourceType.getSyntheticField((SourceTypeBinding) currentType, onlyExactMatch);
 945                 }
 946                 if (path[0] != null) { // keep accumulating
 947
 948                         int count = 1;
 949                         ReferenceBinding currentEnclosingType;
 950                         while ((currentEnclosingType = currentType.enclosingType()) != null) {
 951
 952                                 //done?
 953                                 if (currentType == targetEnclosingType
 954                                         || (!onlyExactMatch && targetEnclosingType.isSuperclassOf(currentType)))        break;
 955
 956                                 if (currentMethodScope != null) {
 957                                         currentMethodScope = currentMethodScope.enclosingMethodScope();
 958                                         if (currentMethodScope != null && currentMethodScope.isConstructorCall){
 959                                                 return NoEnclosingInstanceInConstructorCall;
 960                                         }
 961                                         if (currentMethodScope != null && currentMethodScope.isStatic){
 962                                                 return NoEnclosingInstanceInStaticContext;
 963                                         }
 964                                 }
 965
 966                                 syntheticField = ((NestedTypeBinding) currentType).getSyntheticField((SourceTypeBinding) currentEnclosingType, onlyExactMatch);
 967                                 if (syntheticField == null) break;
 968
 969                                 // append inside the path
 970                                 if (count == path.length) {
 971                                         System.arraycopy(path, 0, (path = new Object[count + 1]), 0, count);
 972                                 }
 973                                 // private access emulation is necessary since synthetic field is private
 974                                 path[count++] = ((SourceTypeBinding) syntheticField.declaringClass).addSyntheticMethod(syntheticField, true);
 975                                 currentType = currentEnclosingType;
 976                         }
 977                         if (currentType == targetEnclosingType
 978                                 || (!onlyExactMatch && targetEnclosingType.isSuperclassOf(currentType))) {
 979                                 return path;
 980                         }
 981                 }
 982                 return null;
 983         }
 984
 985         /* API
 986      *
 987          *      Answer the field binding that corresponds to fieldName.
 988          *      Start the lookup at the receiverType.
 989          *      InvocationSite implements
 990          *              isSuperAccess(); this is used to determine if the discovered field is visible.
 991          *      Only fields defined by the receiverType or its supertypes are answered;
 992          *      a field of an enclosing type will not be found using this API.
 993          *
 994          *      If no visible field is discovered, an error binding is answered.
 995          */
 996         public FieldBinding getField(
 997                 TypeBinding receiverType,
 998                 char[] fieldName,
 999                 InvocationSite invocationSite) {
1000
1001                 FieldBinding field = findField(receiverType, fieldName, invocationSite);
1002                 if (field == null)
1003                         return new ProblemFieldBinding(
1004                                 receiverType instanceof ReferenceBinding
1005                                         ? (ReferenceBinding) receiverType
1006                                         : null,
1007                                 fieldName,
1008                                 NotFound);
1009                 else
1010                         return field;
1011         }
1012
1013         /* API
1014      *
1015          *      Answer the method binding that corresponds to selector, argumentTypes.
1016          *      Start the lookup at the enclosing type of the receiver.
1017          *      InvocationSite implements
1018          *              isSuperAccess(); this is used to determine if the discovered method is visible.
1019          *              setDepth(int); this is used to record the depth of the discovered method
1020          *                      relative to the enclosing type of the receiver. (If the method is defined
1021          *                      in the enclosing type of the receiver, the depth is 0; in the next enclosing
1022          *                      type, the depth is 1; and so on
1023          *
1024          *      If no visible method is discovered, an error binding is answered.
1025          */
1026         public MethodBinding getImplicitMethod(
1027                 char[] selector,
1028                 TypeBinding[] argumentTypes,
1029                 InvocationSite invocationSite) {
1030
1031                 boolean insideStaticContext = false;
1032                 boolean insideConstructorCall = false;
1033                 MethodBinding foundMethod = null;
1034                 ProblemMethodBinding foundFuzzyProblem = null;
1035                 // the weird method lookup case (matches method name in scope, then arg types, then visibility)
1036                 ProblemMethodBinding foundInsideProblem = null;
1037                 // inside Constructor call or inside static context
1038                 Scope scope = this;
1039                 int depth = 0;
1040                 done : while (true) { // done when a COMPILATION_UNIT_SCOPE is found
1041                         switch (scope.kind) {
1042                                 case METHOD_SCOPE :
1043                                         MethodScope methodScope = (MethodScope) scope;
1044                                         insideStaticContext |= methodScope.isStatic;
1045                                         insideConstructorCall |= methodScope.isConstructorCall;
1046                                         break;
1047                                 case CLASS_SCOPE :
1048                                         ClassScope classScope = (ClassScope) scope;
1049                                         SourceTypeBinding receiverType = classScope.referenceContext.binding;
1050                                         boolean isExactMatch = true;
1051                                         // retrieve an exact visible match (if possible)
1052                                         MethodBinding methodBinding =
1053                                                 (foundMethod == null)
1054                                                         ? classScope.findExactMethod(
1055                                                                 receiverType,
1056                                                                 selector,
1057                                                                 argumentTypes,
1058                                                                 invocationSite)
1059                                                         : classScope.findExactMethod(
1060                                                                 receiverType,
1061                                                                 foundMethod.selector,
1062                                                                 foundMethod.parameters,
1063                                                                 invocationSite);
1064                                         //                                              ? findExactMethod(receiverType, selector, argumentTypes, invocationSite)
1065                                         //                                              : findExactMethod(receiverType, foundMethod.selector, foundMethod.parameters, invocationSite);
1066                                         if (methodBinding == null) {
1067                                                 // answers closest approximation, may not check argumentTypes or visibility
1068                                                 isExactMatch = false;
1069                                                 methodBinding =
1070                                                         classScope.findMethod(receiverType, selector, argumentTypes, invocationSite);
1071                                                 //                                      methodBinding = findMethod(receiverType, selector, argumentTypes, invocationSite);
1072                                         }
1073                                         if (methodBinding != null) { // skip it if we did not find anything
1074                                                 if (methodBinding.problemId() == Ambiguous) {
1075                                                         if (foundMethod == null || foundMethod.problemId() == NotVisible)
1076                                                                 // supercedes any potential InheritedNameHidesEnclosingName problem
1077                                                                 return methodBinding;
1078                                                         else
1079                                                                 // make the user qualify the method, likely wants the first inherited method (javac generates an ambiguous error instead)
1080                                                                 return new ProblemMethodBinding(
1081                                                                         selector,
1082                                                                         argumentTypes,
1083                                                                         InheritedNameHidesEnclosingName);
1084                                                 }
1085
1086                                                 ProblemMethodBinding fuzzyProblem = null;
1087                                                 ProblemMethodBinding insideProblem = null;
1088                                                 if (methodBinding.isValidBinding()) {
1089                                                         if (!isExactMatch) {
1090                                                                 if (!areParametersAssignable(methodBinding.parameters, argumentTypes)) {
1091                                                                         if (foundMethod == null || foundMethod.problemId() == NotVisible){
1092                                                                                 // inherited mismatch is reported directly, not looking at enclosing matches
1093                                                                                 return new ProblemMethodBinding(methodBinding, selector, argumentTypes, NotFound);
1094                                                                         }
1095                                                                         // make the user qualify the method, likely wants the first inherited method (javac generates an ambiguous error instead)
1096                                                                         fuzzyProblem = new ProblemMethodBinding(selector, methodBinding.parameters, InheritedNameHidesEnclosingName);
1097
1098                                                                 } else if (!methodBinding.canBeSeenBy(receiverType, invocationSite, classScope)) {
1099                                                                         // using <classScope> instead of <this> for visibility check does grant all access to innerclass
1100                                                                         fuzzyProblem =
1101                                                                                 new ProblemMethodBinding(
1102                                                                                         methodBinding,
1103                                                                                         selector,
1104                                                                                         methodBinding.parameters,
1105                                                                                         NotVisible);
1106                                                                 }
1107                                                         }
1108                                                         if (fuzzyProblem == null && !methodBinding.isStatic()) {
1109                                                                 if (insideConstructorCall) {
1110                                                                         insideProblem =
1111                                                                                 new ProblemMethodBinding(
1112                                                                                         methodBinding.selector,
1113                                                                                         methodBinding.parameters,
1114                                                                                         NonStaticReferenceInConstructorInvocation);
1115                                                                 } else if (insideStaticContext) {
1116                                                                         insideProblem =
1117                                                                                 new ProblemMethodBinding(
1118                                                                                         methodBinding.selector,
1119                                                                                         methodBinding.parameters,
1120                                                                                         NonStaticReferenceInStaticContext);
1121                                                                 }
1122                                                         }
1123
1124 //                                                      if (receiverType == methodBinding.declaringClass
1125 //                                                              || (receiverType.getMethods(selector)) != NoMethods
1126 //                                                              || ((fuzzyProblem == null || fuzzyProblem.problemId() != NotVisible) && environment().options.complianceLevel >= CompilerOptions.JDK1_4)){
1127 //                                                              // found a valid method in the 'immediate' scope (ie. not inherited)
1128 //                                                              // OR the receiverType implemented a method with the correct name
1129 //                                                              // OR in 1.4 mode (inherited visible shadows enclosing)
1130 //                                                              if (foundMethod == null) {
1131 //                                                                      if (depth > 0){
1132 //                                                                              invocationSite.setDepth(depth);
1133 //                                                                              invocationSite.setActualReceiverType(receiverType);
1134 //                                                                      }
1135 //                                                                      // return the methodBinding if it is not declared in a superclass of the scope's binding (that is, inherited)
1136 //                                                                      if (fuzzyProblem != null)
1137 //                                                                              return fuzzyProblem;
1138 //                                                                      if (insideProblem != null)
1139 //                                                                              return insideProblem;
1140 //                                                                      return methodBinding;
1141 //                                                              }
1142 //                                                              // if a method was found, complain when another is found in an 'immediate' enclosing type (that is, not inherited)
1143 //                                                              // NOTE: Unlike fields, a non visible method hides a visible method
1144 //                                                              if (foundMethod.declaringClass != methodBinding.declaringClass)
1145 //                                                                      // ie. have we found the same method - do not trust field identity yet
1146 //                                                                      return new ProblemMethodBinding(
1147 //                                                                              methodBinding.selector,
1148 //                                                                              methodBinding.parameters,
1149 //                                                                              InheritedNameHidesEnclosingName);
1150 //                                                      }
1151                                                 }
1152
1153                                                 if (foundMethod == null
1154                                                         || (foundMethod.problemId() == NotVisible
1155                                                                 && methodBinding.problemId() != NotVisible)) {
1156                                                         // only remember the methodBinding if its the first one found or the previous one was not visible & methodBinding is...
1157                                                         // remember that private methods are visible if defined directly by an enclosing class
1158                                                         if (depth > 0){
1159                                                                 invocationSite.setDepth(depth);
1160                                                                 invocationSite.setActualReceiverType(receiverType);
1161                                                         }
1162                                                         foundFuzzyProblem = fuzzyProblem;
1163                                                         foundInsideProblem = insideProblem;
1164                                                         if (fuzzyProblem == null)
1165                                                                 foundMethod = methodBinding; // only keep it if no error was found
1166                                                 }
1167                                         }
1168                                         depth++;
1169                                         insideStaticContext |= receiverType.isStatic();
1170                                         // 1EX5I8Z - accessing outer fields within a constructor call is permitted
1171                                         // in order to do so, we change the flag as we exit from the type, not the method
1172                                         // itself, because the class scope is used to retrieve the fields.
1173                                         MethodScope enclosingMethodScope = scope.methodScope();
1174                                         insideConstructorCall =
1175                                                 enclosingMethodScope == null ? false : enclosingMethodScope.isConstructorCall;
1176                                         break;
1177                                 case COMPILATION_UNIT_SCOPE :
1178                                         break done;
1179                         }
1180                         scope = scope.parent;
1181                 }
1182
1183                 if (foundFuzzyProblem != null)
1184                         return foundFuzzyProblem;
1185                 if (foundInsideProblem != null)
1186                         return foundInsideProblem;
1187                 if (foundMethod != null)
1188                         return foundMethod;
1189                 return new ProblemMethodBinding(selector, argumentTypes, NotFound);
1190         }
1191
1192         /* API
1193      *
1194          *      Answer the method binding that corresponds to selector, argumentTypes.
1195          *      Start the lookup at the receiverType.
1196          *      InvocationSite implements
1197          *              isSuperAccess(); this is used to determine if the discovered method is visible.
1198          *
1199          *      Only methods defined by the receiverType or its supertypes are answered;
1200          *      use getImplicitMethod() to discover methods of enclosing types.
1201          *
1202          *      If no visible method is discovered, an error binding is answered.
1203          */
1204         public MethodBinding getMethod(
1205                 TypeBinding receiverType,
1206                 char[] selector,
1207                 TypeBinding[] argumentTypes,
1208                 InvocationSite invocationSite) {
1209
1210                 if (receiverType.isArrayType())
1211                         return findMethodForArray(
1212                                 (ArrayBinding) receiverType,
1213                                 selector,
1214                                 argumentTypes,
1215                                 invocationSite);
1216                 if (receiverType.isBaseType())
1217                         return new ProblemMethodBinding(selector, argumentTypes, NotFound);
1218
1219                 ReferenceBinding currentType = (ReferenceBinding) receiverType;
1220                 if (!currentType.canBeSeenBy(this))
1221                         return new ProblemMethodBinding(selector, argumentTypes, ReceiverTypeNotVisible);
1222
1223                 // retrieve an exact visible match (if possible)
1224                 MethodBinding methodBinding =
1225                         findExactMethod(currentType, selector, argumentTypes, invocationSite);
1226                 if (methodBinding != null)
1227                         return methodBinding;
1228
1229                 // answers closest approximation, may not check argumentTypes or visibility
1230                 methodBinding =
1231                         findMethod(currentType, selector, argumentTypes, invocationSite);
1232                 if (methodBinding == null)
1233                         return new ProblemMethodBinding(selector, argumentTypes, NotFound);
1234                 if (methodBinding.isValidBinding()) {
1235                         if (!areParametersAssignable(methodBinding.parameters, argumentTypes))
1236                                 return new ProblemMethodBinding(
1237                                         methodBinding,
1238                                         selector,
1239                                         argumentTypes,
1240                                         NotFound);
1241                         if (!methodBinding.canBeSeenBy(currentType, invocationSite, this))
1242                                 return new ProblemMethodBinding(
1243                                         methodBinding,
1244                                         selector,
1245                                         methodBinding.parameters,
1246                                         NotVisible);
1247                 }
1248                 return methodBinding;
1249         }
1250
1251         public int maxShiftedOffset() {
1252                 int max = -1;
1253                 if (this.shiftScopes != null){
1254                         for (int i = 0, length = this.shiftScopes.length; i < length; i++){
1255                                 int subMaxOffset = this.shiftScopes[i].maxOffset;
1256                                 if (subMaxOffset > max) max = subMaxOffset;
1257                         }
1258                 }
1259                 return max;
1260         }
1261
1262         /* Answer the problem reporter to use for raising new problems.
1263          *
1264          * Note that as a side-effect, this updates the current reference context
1265          * (unit, type or method) in case the problem handler decides it is necessary
1266          * to abort.
1267          */
1268         public ProblemReporter problemReporter() {
1269
1270                 return outerMostMethodScope().problemReporter();
1271         }
1272
1273         /*
1274          * Code responsible to request some more emulation work inside the invocation type, so as to supply
1275          * correct synthetic arguments to any allocation of the target type.
1276          */
1277         public void propagateInnerEmulation(ReferenceBinding targetType, boolean isEnclosingInstanceSupplied) {
1278
1279                 // no need to propagate enclosing instances, they got eagerly allocated already.
1280
1281                 SyntheticArgumentBinding[] syntheticArguments;
1282                 if ((syntheticArguments = targetType.syntheticOuterLocalVariables()) != null) {
1283                         for (int i = 0, max = syntheticArguments.length; i < max; i++) {
1284                                 SyntheticArgumentBinding syntheticArg = syntheticArguments[i];
1285                                 // need to filter out the one that could match a supplied enclosing instance
1286                                 if (!(isEnclosingInstanceSupplied
1287                                         && (syntheticArg.type == targetType.enclosingType()))) {
1288                                         this.emulateOuterAccess(syntheticArg.actualOuterLocalVariable);
1289                                 }
1290                         }
1291                 }
1292         }
1293
1294         /* Answer the reference type of this scope.
1295          *
1296          * It is the nearest enclosing type of this scope.
1297          */
1298         public TypeDeclaration referenceType() {
1299
1300                 return methodScope().referenceType();
1301         }
1302
1303         // start position in this scope - for ordering scopes vs. variables
1304         int startIndex() {
1305                 return startIndex;
1306         }
1307
1308         public String toString() {
1309                 return toString(0);
1310         }
1311
1312         public String toString(int tab) {
1313
1314                 String s = basicToString(tab);
1315                 for (int i = 0; i < scopeIndex; i++)
1316                         if (subscopes[i] instanceof BlockScope)
1317                                 s += ((BlockScope) subscopes[i]).toString(tab + 1) + "\n"; //$NON-NLS-1$
1318                 return s;
1319         }
1320 }