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.impl.Constant;
  15 import net.sourceforge.phpdt.internal.compiler.problem.ProblemReporter;
  16 import net.sourceforge.phpeclipse.internal.compiler.ast.AbstractMethodDeclaration;
  17 import net.sourceforge.phpeclipse.internal.compiler.ast.Argument;
  18 import net.sourceforge.phpeclipse.internal.compiler.ast.AstNode;
  19 import net.sourceforge.phpeclipse.internal.compiler.ast.ConstructorDeclaration;
  20 import net.sourceforge.phpeclipse.internal.compiler.ast.TypeDeclaration;
  21
  22 public class BlockScope extends Scope {
  23
  24         // Local variable management
  25         public LocalVariableBinding[] locals;
  26         public int localIndex; // position for next variable
  27         public int startIndex;  // start position in this scope - for ordering scopes vs. variables
  28         public int offset; // for variable allocation throughout scopes
  29         public int maxOffset; // for variable allocation throughout scopes
  30
  31         // finally scopes must be shifted behind respective try&catch scope(s) so as to avoid
  32         // collisions of secret variables (return address, save value).
  33         public BlockScope[] shiftScopes;
  34
  35         public final static VariableBinding[] EmulationPathToImplicitThis = {};
  36         public final static VariableBinding[] NoEnclosingInstanceInConstructorCall = {};
  37         public final static VariableBinding[] NoEnclosingInstanceInStaticContext = {};
  38
  39         public Scope[] subscopes = new Scope[1]; // need access from code assist
  40         public int scopeIndex = 0; // need access from code assist
  41
  42         protected BlockScope(int kind, Scope parent) {
  43
  44                 super(kind, parent);
  45         }
  46
  47         public BlockScope(BlockScope parent) {
  48
  49                 this(parent, true);
  50         }
  51
  52         public BlockScope(BlockScope parent, boolean addToParentScope) {
  53
  54                 this(BLOCK_SCOPE, parent);
  55                 locals = new LocalVariableBinding[5];
  56                 if (addToParentScope) parent.addSubscope(this);
  57                 this.startIndex = parent.localIndex;
  58         }
  59
  60         public BlockScope(BlockScope parent, int variableCount) {
  61
  62                 this(BLOCK_SCOPE, parent);
  63                 locals = new LocalVariableBinding[variableCount];
  64                 parent.addSubscope(this);
  65                 this.startIndex = parent.localIndex;
  66         }
  67
  68         /* Create the class scope & binding for the anonymous type.
  69          */
  70         public final void addAnonymousType(
  71                 TypeDeclaration anonymousType,
  72                 ReferenceBinding superBinding) {
  73
  74                 ClassScope anonymousClassScope = new ClassScope(this, anonymousType);
  75                 anonymousClassScope.buildAnonymousTypeBinding(
  76                         enclosingSourceType(),
  77                         superBinding);
  78         }
  79
  80         /* Create the class scope & binding for the local type.
  81          */
  82         public final void addLocalType(TypeDeclaration localType) {
  83
  84                 // check that the localType does not conflict with an enclosing type
  85                 ReferenceBinding type = enclosingSourceType();
  86                 do {
  87                         if (CharOperation.equals(type.sourceName, localType.name)) {
  88                                 problemReporter().hidingEnclosingType(localType);
  89                                 return;
  90                         }
  91                         type = type.enclosingType();
  92                 } while (type != null);
  93
  94                 // check that the localType does not conflict with another sibling local type
  95                 Scope scope = this;
  96                 do {
  97                         if (((BlockScope) scope).findLocalType(localType.name) != null) {
  98                                 problemReporter().duplicateNestedType(localType);
  99                                 return;
 100                         }
 101                 } while ((scope = scope.parent) instanceof BlockScope);
 102
 103                 ClassScope localTypeScope = new ClassScope(this, localType);
 104                 addSubscope(localTypeScope);
 105                 localTypeScope.buildLocalTypeBinding(enclosingSourceType());
 106         }
 107
 108         /* Insert a local variable into a given scope, updating its position
 109          * and checking there are not too many locals or arguments allocated.
 110          */
 111         public final void addLocalVariable(LocalVariableBinding binding) {
 112
 113                 checkAndSetModifiersForVariable(binding);
 114
 115                 // insert local in scope
 116                 if (localIndex == locals.length)
 117                         System.arraycopy(
 118                                 locals,
 119                                 0,
 120                                 (locals = new LocalVariableBinding[localIndex * 2]),
 121                                 0,
 122                                 localIndex);
 123                 locals[localIndex++] = binding;
 124
 125                 // update local variable binding
 126                 binding.declaringScope = this;
 127                 binding.id = this.outerMostMethodScope().analysisIndex++;
 128                 // share the outermost method scope analysisIndex
 129         }
 130
 131         public void addSubscope(Scope childScope) {
 132                 if (scopeIndex == subscopes.length)
 133                         System.arraycopy(
 134                                 subscopes,
 135                                 0,
 136                                 (subscopes = new Scope[scopeIndex * 2]),
 137                                 0,
 138                                 scopeIndex);
 139                 subscopes[scopeIndex++] = childScope;
 140         }
 141
 142         /* Answer true if the receiver is suitable for assigning final blank fields.
 143          *
 144          * in other words, it is inside an initializer, a constructor or a clinit
 145          */
 146         public final boolean allowBlankFinalFieldAssignment(FieldBinding binding) {
 147
 148                 if (enclosingSourceType() != binding.declaringClass)
 149                         return false;
 150
 151                 MethodScope methodScope = methodScope();
 152                 if (methodScope.isStatic != binding.isStatic())
 153                         return false;
 154                 return methodScope.isInsideInitializer() // inside initializer
 155                                 || ((AbstractMethodDeclaration) methodScope.referenceContext)
 156                                         .isInitializationMethod(); // inside constructor or clinit
 157         }
 158         String basicToString(int tab) {
 159                 String newLine = "\n"; //$NON-NLS-1$
 160                 for (int i = tab; --i >= 0;)
 161                         newLine += "\t"; //$NON-NLS-1$
 162
 163                 String s = newLine + "--- Block Scope ---"; //$NON-NLS-1$
 164                 newLine += "\t"; //$NON-NLS-1$
 165                 s += newLine + "locals:"; //$NON-NLS-1$
 166                 for (int i = 0; i < localIndex; i++)
 167                         s += newLine + "\t" + locals[i].toString(); //$NON-NLS-1$
 168                 s += newLine + "startIndex = " + startIndex; //$NON-NLS-1$
 169                 return s;
 170         }
 171
 172         private void checkAndSetModifiersForVariable(LocalVariableBinding varBinding) {
 173
 174                 int modifiers = varBinding.modifiers;
 175                 if ((modifiers & AccAlternateModifierProblem) != 0 && varBinding.declaration != null){
 176                         problemReporter().duplicateModifierForVariable(varBinding.declaration, this instanceof MethodScope);
 177                 }
 178                 int realModifiers = modifiers & AccJustFlag;
 179
 180                 int unexpectedModifiers = ~AccFinal;
 181                 if ((realModifiers & unexpectedModifiers) != 0 && varBinding.declaration != null){
 182                         problemReporter().illegalModifierForVariable(varBinding.declaration, this instanceof MethodScope);
 183                 }
 184                 varBinding.modifiers = modifiers;
 185         }
 186
 187         /* Compute variable positions in scopes given an initial position offset
 188          * ignoring unused local variables.
 189          *
 190          * No argument is expected here (ilocal is the first non-argument local of the outermost scope)
 191          * Arguments are managed by the MethodScope method
 192          */
 193 //      void computeLocalVariablePositions(int ilocal, int initOffset, CodeStream codeStream) {
 194 //
 195 //              this.offset = initOffset;
 196 //              this.maxOffset = initOffset;
 197 //
 198 //              // local variable init
 199 //              int maxLocals = this.localIndex;
 200 //              boolean hasMoreVariables = ilocal < maxLocals;
 201 //
 202 //              // scope init
 203 //              int iscope = 0, maxScopes = this.scopeIndex;
 204 //              boolean hasMoreScopes = maxScopes > 0;
 205 //
 206 //              // iterate scopes and variables in parallel
 207 //              while (hasMoreVariables || hasMoreScopes) {
 208 //                      if (hasMoreScopes
 209 //                              && (!hasMoreVariables || (subscopes[iscope].startIndex() <= ilocal))) {
 210 //                              // consider subscope first
 211 //                              if (subscopes[iscope] instanceof BlockScope) {
 212 //                                      BlockScope subscope = (BlockScope) subscopes[iscope];
 213 //                                      int subOffset = subscope.shiftScopes == null ? this.offset : subscope.maxShiftedOffset();
 214 //                                      subscope.computeLocalVariablePositions(0, subOffset, codeStream);
 215 //                                      if (subscope.maxOffset > this.maxOffset)
 216 //                                              this.maxOffset = subscope.maxOffset;
 217 //                              }
 218 //                              hasMoreScopes = ++iscope < maxScopes;
 219 //                      } else {
 220 //
 221 //                              // consider variable first
 222 //                              LocalVariableBinding local = locals[ilocal]; // if no local at all, will be locals[ilocal]==null
 223 //
 224 //                              // check if variable is actually used, and may force it to be preserved
 225 //                              boolean generateCurrentLocalVar = (local.useFlag == LocalVariableBinding.USED && (local.constant == Constant.NotAConstant));
 226 //
 227 //                              // do not report fake used variable
 228 //                              if (local.useFlag == LocalVariableBinding.UNUSED
 229 //                                      && (local.declaration != null) // unused (and non secret) local
 230 //                                      && ((local.declaration.bits & AstNode.IsLocalDeclarationReachableMASK) != 0)) { // declaration is reachable
 231 //
 232 //                                      if (!(local.declaration instanceof Argument))  // do not report unused catch arguments
 233 //                                              this.problemReporter().unusedLocalVariable(local.declaration);
 234 //                              }
 235 //
 236 //                              // could be optimized out, but does need to preserve unread variables ?
 237 ////                            if (!generateCurrentLocalVar) {
 238 ////                                    if (local.declaration != null && environment().options.preserveAllLocalVariables) {
 239 ////                                            generateCurrentLocalVar = true; // force it to be preserved in the generated code
 240 ////                                            local.useFlag = LocalVariableBinding.USED;
 241 ////                                    }
 242 ////                            }
 243 //
 244 //                              // allocate variable
 245 //                              if (generateCurrentLocalVar) {
 246 //
 247 //                                      if (local.declaration != null) {
 248 //                                              codeStream.record(local); // record user-defined local variables for attribute generation
 249 //                                      }
 250 //                                      // assign variable position
 251 //                                      local.resolvedPosition = this.offset;
 252 //
 253 //                                      if ((local.type == LongBinding) || (local.type == DoubleBinding)) {
 254 //                                              this.offset += 2;
 255 //                                      } else {
 256 //                                              this.offset++;
 257 //                                      }
 258 //                                      if (this.offset > 0xFFFF) { // no more than 65535 words of locals
 259 //                                              this.problemReporter().noMoreAvailableSpaceForLocal(
 260 //                                                      local,
 261 //                                                      local.declaration == null ? (AstNode)this.methodScope().referenceContext : local.declaration);
 262 //                                      }
 263 //                              } else {
 264 //                                      local.resolvedPosition = -1; // not generated
 265 //                              }
 266 //                              hasMoreVariables = ++ilocal < maxLocals;
 267 //                      }
 268 //              }
 269 //              if (this.offset > this.maxOffset)
 270 //                      this.maxOffset = this.offset;
 271 //      }
 272
 273         /* Answer true if the variable name already exists within the receiver's scope.
 274          */
 275         public final LocalVariableBinding duplicateName(char[] name) {
 276                 for (int i = 0; i < localIndex; i++)
 277                         if (CharOperation.equals(name, locals[i].name))
 278                                 return locals[i];
 279
 280                 if (this instanceof MethodScope)
 281                         return null;
 282                 else
 283                         return ((BlockScope) parent).duplicateName(name);
 284         }
 285
 286         /*
 287          *      Record the suitable binding denoting a synthetic field or constructor argument,
 288          * mapping to the actual outer local variable in the scope context.
 289          * Note that this may not need any effect, in case the outer local variable does not
 290          * need to be emulated and can directly be used as is (using its back pointer to its
 291          * declaring scope).
 292          */
 293         public void emulateOuterAccess(LocalVariableBinding outerLocalVariable) {
 294
 295                 MethodScope currentMethodScope;
 296                 if ((currentMethodScope = this.methodScope())
 297                         != outerLocalVariable.declaringScope.methodScope()) {
 298                         NestedTypeBinding currentType = (NestedTypeBinding) this.enclosingSourceType();
 299
 300                         //do nothing for member types, pre emulation was performed already
 301                         if (!currentType.isLocalType()) {
 302                                 return;
 303                         }
 304                         // must also add a synthetic field if we're not inside a constructor
 305                         if (!currentMethodScope.isInsideInitializerOrConstructor()) {
 306                                 currentType.addSyntheticArgumentAndField(outerLocalVariable);
 307                         } else {
 308                                 currentType.addSyntheticArgument(outerLocalVariable);
 309                         }
 310                 }
 311         }
 312
 313         /* Note that it must never produce a direct access to the targetEnclosingType,
 314          * but instead a field sequence (this$2.this$1.this$0) so as to handle such a test case:
 315          *
 316          * class XX {
 317          *      void foo() {
 318          *              class A {
 319          *                      class B {
 320          *                              class C {
 321          *                                      boolean foo() {
 322          *                                              return (Object) A.this == (Object) B.this;
 323          *                                      }
 324          *                              }
 325          *                      }
 326          *              }
 327          *              new A().new B().new C();
 328          *      }
 329          * }
 330          * where we only want to deal with ONE enclosing instance for C (could not figure out an A for C)
 331          */
 332         public final ReferenceBinding findLocalType(char[] name) {
 333
 334                 for (int i = 0, length = scopeIndex; i < length; i++) {
 335                         if (subscopes[i] instanceof ClassScope) {
 336                                 SourceTypeBinding sourceType =
 337                                         ((ClassScope) subscopes[i]).referenceContext.binding;
 338                                 if (CharOperation.equals(sourceType.sourceName(), name))
 339                                         return sourceType;
 340                         }
 341                 }
 342                 return null;
 343         }
 344
 345         public LocalVariableBinding findVariable(char[] variable) {
 346
 347                 int variableLength = variable.length;
 348                 for (int i = 0, length = locals.length; i < length; i++) {
 349                         LocalVariableBinding local = locals[i];
 350                         if (local == null)
 351                                 return null;
 352                         if (local.name.length == variableLength
 353                                 && CharOperation.prefixEquals(local.name, variable))
 354                                 return local;
 355                 }
 356                 return null;
 357         }
 358         /* API
 359      * flag is a mask of the following values VARIABLE (= FIELD or LOCAL), TYPE.
 360          * Only bindings corresponding to the mask will be answered.
 361          *
 362          *      if the VARIABLE mask is set then
 363          *              If the first name provided is a field (or local) then the field (or local) is answered
 364          *              Otherwise, package names and type names are consumed until a field is found.
 365          *              In this case, the field is answered.
 366          *
 367          *      if the TYPE mask is set,
 368          *              package names and type names are consumed until the end of the input.
 369          *              Only if all of the input is consumed is the type answered
 370          *
 371          *      All other conditions are errors, and a problem binding is returned.
 372          *
 373          *      NOTE: If a problem binding is returned, senders should extract the compound name
 374          *      from the binding & not assume the problem applies to the entire compoundName.
 375          *
 376          *      The VARIABLE mask has precedence over the TYPE mask.
 377          *
 378          *      InvocationSite implements
 379          *              isSuperAccess(); this is used to determine if the discovered field is visible.
 380          *              setFieldIndex(int); this is used to record the number of names that were consumed.
 381          *
 382          *      For example, getBinding({"foo","y","q", VARIABLE, site) will answer
 383          *      the binding for the field or local named "foo" (or an error binding if none exists).
 384          *      In addition, setFieldIndex(1) will be sent to the invocation site.
 385          *      If a type named "foo" exists, it will not be detected (and an error binding will be answered)
 386          *
 387          *      IMPORTANT NOTE: This method is written under the assumption that compoundName is longer than length 1.
 388          */
 389         public Binding getBinding(char[][] compoundName, int mask, InvocationSite invocationSite) {
 390
 391                 Binding binding = getBinding(compoundName[0], mask | TYPE | PACKAGE, invocationSite);
 392                 invocationSite.setFieldIndex(1);
 393                 if (binding instanceof VariableBinding) return binding;
 394                 compilationUnitScope().recordSimpleReference(compoundName[0]);
 395                 if (!binding.isValidBinding()) return binding;
 396
 397                 int length = compoundName.length;
 398                 int currentIndex = 1;
 399                 foundType : if (binding instanceof PackageBinding) {
 400                         PackageBinding packageBinding = (PackageBinding) binding;
 401                         while (currentIndex < length) {
 402                                 compilationUnitScope().recordReference(packageBinding.compoundName, compoundName[currentIndex]);
 403                                 binding = packageBinding.getTypeOrPackage(compoundName[currentIndex++]);
 404                                 invocationSite.setFieldIndex(currentIndex);
 405                                 if (binding == null) {
 406                                         if (currentIndex == length)
 407                                                 // must be a type if its the last name, otherwise we have no idea if its a package or type
 408                                                 return new ProblemReferenceBinding(
 409                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 410                                                         NotFound);
 411                                         else
 412                                                 return new ProblemBinding(
 413                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 414                                                         NotFound);
 415                                 }
 416                                 if (binding instanceof ReferenceBinding) {
 417                                         if (!binding.isValidBinding())
 418                                                 return new ProblemReferenceBinding(
 419                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 420                                                         binding.problemId());
 421                                         if (!((ReferenceBinding) binding).canBeSeenBy(this))
 422                                                 return new ProblemReferenceBinding(
 423                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 424                                                         binding,
 425                                                         NotVisible);
 426                                         break foundType;
 427                                 }
 428                                 packageBinding = (PackageBinding) binding;
 429                         }
 430
 431                         // It is illegal to request a PACKAGE from this method.
 432                         return new ProblemReferenceBinding(
 433                                 CharOperation.subarray(compoundName, 0, currentIndex),
 434                                 NotFound);
 435                 }
 436
 437                 // know binding is now a ReferenceBinding
 438                 while (currentIndex < length) {
 439                         ReferenceBinding typeBinding = (ReferenceBinding) binding;
 440                         char[] nextName = compoundName[currentIndex++];
 441                         invocationSite.setFieldIndex(currentIndex);
 442                         invocationSite.setActualReceiverType(typeBinding);
 443                         if ((mask & FIELD) != 0 && (binding = findField(typeBinding, nextName, invocationSite)) != null) {
 444                                 if (!binding.isValidBinding())
 445                                         return new ProblemFieldBinding(
 446                                                 ((FieldBinding) binding).declaringClass,
 447                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 448                                                 binding.problemId());
 449                                 break; // binding is now a field
 450                         }
 451                         if ((binding = findMemberType(nextName, typeBinding)) == null) {
 452                                 if ((mask & FIELD) != 0) {
 453                                         return new ProblemBinding(
 454                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 455                                                 typeBinding,
 456                                                 NotFound);
 457                                 } else {
 458                                         return new ProblemReferenceBinding(
 459                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 460                                                 typeBinding,
 461                                                 NotFound);
 462                                 }
 463                         }
 464                         if (!binding.isValidBinding())
 465                                 return new ProblemReferenceBinding(
 466                                         CharOperation.subarray(compoundName, 0, currentIndex),
 467                                         binding.problemId());
 468                 }
 469
 470                 if ((mask & FIELD) != 0 && (binding instanceof FieldBinding)) {
 471                         // was looking for a field and found a field
 472                         FieldBinding field = (FieldBinding) binding;
 473                         if (!field.isStatic())
 474                                 return new ProblemFieldBinding(
 475                                         field.declaringClass,
 476                                         CharOperation.subarray(compoundName, 0, currentIndex),
 477                                         NonStaticReferenceInStaticContext);
 478                         return binding;
 479                 }
 480                 if ((mask & TYPE) != 0 && (binding instanceof ReferenceBinding)) {
 481                         // was looking for a type and found a type
 482                         return binding;
 483                 }
 484
 485                 // handle the case when a field or type was asked for but we resolved the compoundName to a type or field
 486                 return new ProblemBinding(
 487                         CharOperation.subarray(compoundName, 0, currentIndex),
 488                         NotFound);
 489         }
 490
 491         // Added for code assist... NOT Public API
 492         public final Binding getBinding(
 493                 char[][] compoundName,
 494                 InvocationSite invocationSite) {
 495                 int currentIndex = 0;
 496                 int length = compoundName.length;
 497                 Binding binding =
 498                         getBinding(
 499                                 compoundName[currentIndex++],
 500                                 VARIABLE | TYPE | PACKAGE,
 501                                 invocationSite);
 502                 if (!binding.isValidBinding())
 503                         return binding;
 504
 505                 foundType : if (binding instanceof PackageBinding) {
 506                         while (currentIndex < length) {
 507                                 PackageBinding packageBinding = (PackageBinding) binding;
 508                                 binding = packageBinding.getTypeOrPackage(compoundName[currentIndex++]);
 509                                 if (binding == null) {
 510                                         if (currentIndex == length)
 511                                                 // must be a type if its the last name, otherwise we have no idea if its a package or type
 512                                                 return new ProblemReferenceBinding(
 513                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 514                                                         NotFound);
 515                                         else
 516                                                 return new ProblemBinding(
 517                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 518                                                         NotFound);
 519                                 }
 520                                 if (binding instanceof ReferenceBinding) {
 521                                         if (!binding.isValidBinding())
 522                                                 return new ProblemReferenceBinding(
 523                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 524                                                         binding.problemId());
 525                                         if (!((ReferenceBinding) binding).canBeSeenBy(this))
 526                                                 return new ProblemReferenceBinding(
 527                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 528                                                         binding,
 529                                                         NotVisible);
 530                                         break foundType;
 531                                 }
 532                         }
 533                         return binding;
 534                 }
 535
 536                 foundField : if (binding instanceof ReferenceBinding) {
 537                         while (currentIndex < length) {
 538                                 ReferenceBinding typeBinding = (ReferenceBinding) binding;
 539                                 char[] nextName = compoundName[currentIndex++];
 540                                 if ((binding = findField(typeBinding, nextName, invocationSite)) != null) {
 541                                         if (!binding.isValidBinding())
 542                                                 return new ProblemFieldBinding(
 543                                                         ((FieldBinding) binding).declaringClass,
 544                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 545                                                         binding.problemId());
 546                                         if (!((FieldBinding) binding).isStatic())
 547                                                 return new ProblemFieldBinding(
 548                                                         ((FieldBinding) binding).declaringClass,
 549                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 550                                                         NonStaticReferenceInStaticContext);
 551                                         break foundField; // binding is now a field
 552                                 }
 553                                 if ((binding = findMemberType(nextName, typeBinding)) == null)
 554                                         return new ProblemBinding(
 555                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 556                                                 typeBinding,
 557                                                 NotFound);
 558                                 if (!binding.isValidBinding())
 559                                         return new ProblemReferenceBinding(
 560                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 561                                                 binding.problemId());
 562                         }
 563                         return binding;
 564                 }
 565
 566                 VariableBinding variableBinding = (VariableBinding) binding;
 567                 while (currentIndex < length) {
 568                         TypeBinding typeBinding = variableBinding.type;
 569                         if (typeBinding == null)
 570                                 return new ProblemFieldBinding(
 571                                         null,
 572                                         CharOperation.subarray(compoundName, 0, currentIndex + 1),
 573                                         NotFound);
 574                         variableBinding =
 575                                 findField(typeBinding, compoundName[currentIndex++], invocationSite);
 576                         if (variableBinding == null)
 577                                 return new ProblemFieldBinding(
 578                                         null,
 579                                         CharOperation.subarray(compoundName, 0, currentIndex),
 580                                         NotFound);
 581                         if (!variableBinding.isValidBinding())
 582                                 return variableBinding;
 583                 }
 584                 return variableBinding;
 585         }
 586
 587         /* API
 588      *
 589          *      Answer the binding that corresponds to the argument name.
 590          *      flag is a mask of the following values VARIABLE (= FIELD or LOCAL), TYPE, PACKAGE.
 591          *      Only bindings corresponding to the mask can be answered.
 592          *
 593          *      For example, getBinding("foo", VARIABLE, site) will answer
 594          *      the binding for the field or local named "foo" (or an error binding if none exists).
 595          *      If a type named "foo" exists, it will not be detected (and an error binding will be answered)
 596          *
 597          *      The VARIABLE mask has precedence over the TYPE mask.
 598          *
 599          *      If the VARIABLE mask is not set, neither fields nor locals will be looked for.
 600          *
 601          *      InvocationSite implements:
 602          *              isSuperAccess(); this is used to determine if the discovered field is visible.
 603          *
 604          *      Limitations: cannot request FIELD independently of LOCAL, or vice versa
 605          */
 606         public Binding getBinding(char[] name, int mask, InvocationSite invocationSite) {
 607
 608                 Binding binding = null;
 609                 FieldBinding problemField = null;
 610                 if ((mask & VARIABLE) != 0) {
 611                         if (this.kind == BLOCK_SCOPE || this.kind == METHOD_SCOPE) {
 612                                 LocalVariableBinding variableBinding = findVariable(name);
 613                                 // looks in this scope only
 614                                 if (variableBinding != null) return variableBinding;
 615                         }
 616
 617                         boolean insideStaticContext = false;
 618                         boolean insideConstructorCall = false;
 619                         if (this.kind == METHOD_SCOPE) {
 620                                 MethodScope methodScope = (MethodScope) this;
 621                                 insideStaticContext |= methodScope.isStatic;
 622                                 insideConstructorCall |= methodScope.isConstructorCall;
 623                         }
 624
 625                         FieldBinding foundField = null;
 626                         // can be a problem field which is answered if a valid field is not found
 627                         ProblemFieldBinding foundInsideProblem = null;
 628                         // inside Constructor call or inside static context
 629                         Scope scope = parent;
 630                         int depth = 0;
 631                         int foundDepth = 0;
 632                         ReferenceBinding foundActualReceiverType = null;
 633                         done : while (true) { // done when a COMPILATION_UNIT_SCOPE is found
 634                                 switch (scope.kind) {
 635                                         case METHOD_SCOPE :
 636                                                 MethodScope methodScope = (MethodScope) scope;
 637                                                 insideStaticContext |= methodScope.isStatic;
 638                                                 insideConstructorCall |= methodScope.isConstructorCall;
 639                                                 // Fall through... could duplicate the code below to save a cast - questionable optimization
 640                                         case BLOCK_SCOPE :
 641                                                 LocalVariableBinding variableBinding = ((BlockScope) scope).findVariable(name);
 642                                                 // looks in this scope only
 643                                                 if (variableBinding != null) {
 644                                                         if (foundField != null && foundField.isValidBinding())
 645                                                                 return new ProblemFieldBinding(
 646                                                                         foundField.declaringClass,
 647                                                                         name,
 648                                                                         InheritedNameHidesEnclosingName);
 649                                                         if (depth > 0)
 650                                                                 invocationSite.setDepth(depth);
 651                                                         return variableBinding;
 652                                                 }
 653                                                 break;
 654                                         case CLASS_SCOPE :
 655                                                 ClassScope classScope = (ClassScope) scope;
 656                                                 SourceTypeBinding enclosingType = classScope.referenceContext.binding;
 657                                                 FieldBinding fieldBinding =
 658                                                         classScope.findField(enclosingType, name, invocationSite);
 659                                                 // Use next line instead if willing to enable protected access accross inner types
 660                                                 // FieldBinding fieldBinding = findField(enclosingType, name, invocationSite);
 661                                                 if (fieldBinding != null) { // skip it if we did not find anything
 662                                                         if (fieldBinding.problemId() == Ambiguous) {
 663                                                                 if (foundField == null || foundField.problemId() == NotVisible)
 664                                                                         // supercedes any potential InheritedNameHidesEnclosingName problem
 665                                                                         return fieldBinding;
 666                                                                 else
 667                                                                         // make the user qualify the field, likely wants the first inherited field (javac generates an ambiguous error instead)
 668                                                                         return new ProblemFieldBinding(
 669                                                                                 fieldBinding.declaringClass,
 670                                                                                 name,
 671                                                                                 InheritedNameHidesEnclosingName);
 672                                                         }
 673
 674                                                         ProblemFieldBinding insideProblem = null;
 675                                                         if (fieldBinding.isValidBinding()) {
 676                                                                 if (!fieldBinding.isStatic()) {
 677                                                                         if (insideConstructorCall) {
 678                                                                                 insideProblem =
 679                                                                                         new ProblemFieldBinding(
 680                                                                                                 fieldBinding.declaringClass,
 681                                                                                                 name,
 682                                                                                                 NonStaticReferenceInConstructorInvocation);
 683                                                                         } else if (insideStaticContext) {
 684                                                                                 insideProblem =
 685                                                                                         new ProblemFieldBinding(
 686                                                                                                 fieldBinding.declaringClass,
 687                                                                                                 name,
 688                                                                                                 NonStaticReferenceInStaticContext);
 689                                                                         }
 690                                                                 }
 691 //                                                              if (enclosingType == fieldBinding.declaringClass
 692 //                                                                      || environment().options.complianceLevel >= CompilerOptions.JDK1_4){
 693 //                                                                      // found a valid field in the 'immediate' scope (ie. not inherited)
 694 //                                                                      // OR in 1.4 mode (inherited shadows enclosing)
 695 //                                                                      if (foundField == null) {
 696 //                                                                              if (depth > 0){
 697 //                                                                                      invocationSite.setDepth(depth);
 698 //                                                                                      invocationSite.setActualReceiverType(enclosingType);
 699 //                                                                              }
 700 //                                                                              // return the fieldBinding if it is not declared in a superclass of the scope's binding (that is, inherited)
 701 //                                                                              return insideProblem == null ? fieldBinding : insideProblem;
 702 //                                                                      }
 703 //                                                                      if (foundField.isValidBinding())
 704 //                                                                              // if a valid field was found, complain when another is found in an 'immediate' enclosing type (that is, not inherited)
 705 //                                                                              if (foundField.declaringClass != fieldBinding.declaringClass)
 706 //                                                                                      // ie. have we found the same field - do not trust field identity yet
 707 //                                                                                      return new ProblemFieldBinding(
 708 //                                                                                              fieldBinding.declaringClass,
 709 //                                                                                              name,
 710 //                                                                                              InheritedNameHidesEnclosingName);
 711 //                                                              }
 712                                                         }
 713
 714                                                         if (foundField == null
 715                                                                 || (foundField.problemId() == NotVisible
 716                                                                         && fieldBinding.problemId() != NotVisible)) {
 717                                                                 // only remember the fieldBinding if its the first one found or the previous one was not visible & fieldBinding is...
 718                                                                 foundDepth = depth;
 719                                                                 foundActualReceiverType = enclosingType;
 720                                                                 foundInsideProblem = insideProblem;
 721                                                                 foundField = fieldBinding;
 722                                                         }
 723                                                 }
 724                                                 depth++;
 725                                                 insideStaticContext |= enclosingType.isStatic();
 726                                                 // 1EX5I8Z - accessing outer fields within a constructor call is permitted
 727                                                 // in order to do so, we change the flag as we exit from the type, not the method
 728                                                 // itself, because the class scope is used to retrieve the fields.
 729                                                 MethodScope enclosingMethodScope = scope.methodScope();
 730                                                 insideConstructorCall =
 731                                                         enclosingMethodScope == null ? false : enclosingMethodScope.isConstructorCall;
 732                                                 break;
 733                                         case COMPILATION_UNIT_SCOPE :
 734                                                 break done;
 735                                 }
 736                                 scope = scope.parent;
 737                         }
 738
 739                         if (foundInsideProblem != null){
 740                                 return foundInsideProblem;
 741                         }
 742                         if (foundField != null) {
 743                                 if (foundField.isValidBinding()){
 744                                         if (foundDepth > 0){
 745                                                 invocationSite.setDepth(foundDepth);
 746                                                 invocationSite.setActualReceiverType(foundActualReceiverType);
 747                                         }
 748                                         return foundField;
 749                                 }
 750                                 problemField = foundField;
 751                         }
 752                 }
 753
 754                 // We did not find a local or instance variable.
 755                 if ((mask & TYPE) != 0) {
 756                         if ((binding = getBaseType(name)) != null)
 757                                 return binding;
 758                         binding = getTypeOrPackage(name, (mask & PACKAGE) == 0 ? TYPE : TYPE | PACKAGE);
 759                         if (binding.isValidBinding() || mask == TYPE)
 760                                 return binding;
 761                         // answer the problem type binding if we are only looking for a type
 762                 } else if ((mask & PACKAGE) != 0) {
 763                         compilationUnitScope().recordSimpleReference(name);
 764                         if ((binding = environment().getTopLevelPackage(name)) != null)
 765                                 return binding;
 766                 }
 767                 if (problemField != null)
 768                         return problemField;
 769                 else
 770                         return new ProblemBinding(name, enclosingSourceType(), NotFound);
 771         }
 772
 773         /* API
 774          *
 775          *      Answer the constructor binding that corresponds to receiverType, argumentTypes.
 776          *
 777          *      InvocationSite implements
 778          *              isSuperAccess(); this is used to determine if the discovered constructor is visible.
 779          *
 780          *      If no visible constructor is discovered, an error binding is answered.
 781          */
 782         public MethodBinding getConstructor(
 783                 ReferenceBinding receiverType,
 784                 TypeBinding[] argumentTypes,
 785                 InvocationSite invocationSite) {
 786
 787                 compilationUnitScope().recordTypeReference(receiverType);
 788                 compilationUnitScope().recordTypeReferences(argumentTypes);
 789                 MethodBinding methodBinding = receiverType.getExactConstructor(argumentTypes);
 790                 if (methodBinding != null) {
 791                         if (methodBinding.canBeSeenBy(invocationSite, this))
 792                                 return methodBinding;
 793                 }
 794                 MethodBinding[] methods =
 795                         receiverType.getMethods(ConstructorDeclaration.ConstantPoolName);
 796                 if (methods == NoMethods) {
 797                         return new ProblemMethodBinding(
 798                                 ConstructorDeclaration.ConstantPoolName,
 799                                 argumentTypes,
 800                                 NotFound);
 801                 }
 802                 MethodBinding[] compatible = new MethodBinding[methods.length];
 803                 int compatibleIndex = 0;
 804                 for (int i = 0, length = methods.length; i < length; i++)
 805                         if (areParametersAssignable(methods[i].parameters, argumentTypes))
 806                                 compatible[compatibleIndex++] = methods[i];
 807                 if (compatibleIndex == 0)
 808                         return new ProblemMethodBinding(
 809                                 ConstructorDeclaration.ConstantPoolName,
 810                                 argumentTypes,
 811                                 NotFound);
 812                 // need a more descriptive error... cannot convert from X to Y
 813
 814                 MethodBinding[] visible = new MethodBinding[compatibleIndex];
 815                 int visibleIndex = 0;
 816                 for (int i = 0; i < compatibleIndex; i++) {
 817                         MethodBinding method = compatible[i];
 818                         if (method.canBeSeenBy(invocationSite, this))
 819                                 visible[visibleIndex++] = method;
 820                 }
 821                 if (visibleIndex == 1)
 822                         return visible[0];
 823                 if (visibleIndex == 0)
 824                         return new ProblemMethodBinding(
 825                                 compatible[0],
 826                                 ConstructorDeclaration.ConstantPoolName,
 827                                 compatible[0].parameters,
 828                                 NotVisible);
 829                 return mostSpecificClassMethodBinding(visible, visibleIndex);
 830         }
 831
 832         /*
 833          * This retrieves the argument that maps to an enclosing instance of the suitable type,
 834          *      if not found then answers nil -- do not create one
 835      *
 836          *              #implicitThis                                           : the implicit this will be ok
 837          *              #((arg) this$n)                                         : available as a constructor arg
 838          *              #((arg) this$n ... this$p)                      : available as as a constructor arg + a sequence of fields
 839          *              #((fieldDescr) this$n ... this$p)       : available as a sequence of fields
 840          *              nil                                                                                                     : not found
 841          *
 842          *      Note that this algorithm should answer the shortest possible sequence when
 843          *              shortcuts are available:
 844          *                              this$0 . this$0 . this$0
 845          *              instead of
 846          *                              this$2 . this$1 . this$0 . this$1 . this$0
 847          *              thus the code generation will be more compact and runtime faster
 848          */
 849         public VariableBinding[] getEmulationPath(LocalVariableBinding outerLocalVariable) {
 850
 851                 MethodScope currentMethodScope = this.methodScope();
 852                 SourceTypeBinding sourceType = currentMethodScope.enclosingSourceType();
 853
 854                 // identity check
 855                 if (currentMethodScope == outerLocalVariable.declaringScope.methodScope()) {
 856                         return new VariableBinding[] { outerLocalVariable };
 857                         // implicit this is good enough
 858                 }
 859                 // use synthetic constructor arguments if possible
 860                 if (currentMethodScope.isInsideInitializerOrConstructor()
 861                         && (sourceType.isNestedType())) {
 862                         SyntheticArgumentBinding syntheticArg;
 863                         if ((syntheticArg = ((NestedTypeBinding) sourceType).getSyntheticArgument(outerLocalVariable)) != null) {
 864                                 return new VariableBinding[] { syntheticArg };
 865                         }
 866                 }
 867                 // use a synthetic field then
 868                 if (!currentMethodScope.isStatic) {
 869                         FieldBinding syntheticField;
 870                         if ((syntheticField = sourceType.getSyntheticField(outerLocalVariable)) != null) {
 871                                 return new VariableBinding[] { syntheticField };
 872                         }
 873                 }
 874                 return null;
 875         }
 876
 877         /*
 878          * This retrieves the argument that maps to an enclosing instance of the suitable type,
 879          *      if not found then answers nil -- do not create one
 880          *
 881          *              #implicitThis                                                           :  the implicit this will be ok
 882          *              #((arg) this$n)                                                         : available as a constructor arg
 883          *              #((arg) this$n access$m... access$p)            : available as as a constructor arg + a sequence of synthetic accessors to synthetic fields
 884          *              #((fieldDescr) this$n access#m... access$p)     : available as a first synthetic field + a sequence of synthetic accessors to synthetic fields
 885          *              nil                                                                                                                             : not found
 886          *      jls 15.9.2
 887          */
 888         public Object[] getEmulationPath(
 889                         ReferenceBinding targetEnclosingType,
 890                         boolean onlyExactMatch,
 891                         boolean ignoreEnclosingArgInConstructorCall) {
 892                 //TODO: (philippe) investigate why exactly test76 fails if ignoreEnclosingArgInConstructorCall is always false
 893                 MethodScope currentMethodScope = this.methodScope();
 894                 SourceTypeBinding sourceType = currentMethodScope.enclosingSourceType();
 895
 896                 // identity check
 897                 if (!currentMethodScope.isStatic
 898                         && (!currentMethodScope.isConstructorCall || ignoreEnclosingArgInConstructorCall)
 899                         && (sourceType == targetEnclosingType
 900                                 || (!onlyExactMatch && targetEnclosingType.isSuperclassOf(sourceType)))) {
 901                         if (currentMethodScope.isConstructorCall) {
 902                                 return NoEnclosingInstanceInConstructorCall;
 903                         }
 904                         if (currentMethodScope.isStatic){
 905                                 return NoEnclosingInstanceInStaticContext;
 906                         }
 907                         return EmulationPathToImplicitThis; // implicit this is good enough
 908                 }
 909                 if (!sourceType.isNestedType() || sourceType.isStatic()) { // no emulation from within non-inner types
 910                         if (currentMethodScope.isConstructorCall) {
 911                                 return NoEnclosingInstanceInConstructorCall;
 912                         }
 913                                 if (currentMethodScope.isStatic){
 914                                         return NoEnclosingInstanceInStaticContext;
 915                                 }
 916                         return null;
 917                 }
 918                 boolean insideConstructor = currentMethodScope.isInsideInitializerOrConstructor();
 919                 // use synthetic constructor arguments if possible
 920                 if (insideConstructor) {
 921                         SyntheticArgumentBinding syntheticArg;
 922                         if ((syntheticArg = ((NestedTypeBinding) sourceType).getSyntheticArgument(targetEnclosingType, onlyExactMatch)) != null) {
 923                                 return new Object[] { syntheticArg };
 924                         }
 925                 }
 926
 927                 // use a direct synthetic field then
 928                 if (currentMethodScope.isStatic) {
 929                         return NoEnclosingInstanceInStaticContext;
 930                 }
 931                 FieldBinding syntheticField = sourceType.getSyntheticField(targetEnclosingType, onlyExactMatch);
 932                 if (syntheticField != null) {
 933                         if (currentMethodScope.isConstructorCall){
 934                                 return NoEnclosingInstanceInConstructorCall;
 935                         }
 936                         return new Object[] { syntheticField };
 937                 }
 938                 // could be reached through a sequence of enclosing instance link (nested members)
 939                 Object[] path = new Object[2]; // probably at least 2 of them
 940                 ReferenceBinding currentType = sourceType.enclosingType();
 941                 if (insideConstructor) {
 942                         path[0] = ((NestedTypeBinding) sourceType).getSyntheticArgument((SourceTypeBinding) currentType, onlyExactMatch);
 943                 } else {
 944                         if (currentMethodScope.isConstructorCall){
 945                                 return NoEnclosingInstanceInConstructorCall;
 946                         }
 947                         path[0] = sourceType.getSyntheticField((SourceTypeBinding) currentType, onlyExactMatch);
 948                 }
 949                 if (path[0] != null) { // keep accumulating
 950
 951                         int count = 1;
 952                         ReferenceBinding currentEnclosingType;
 953                         while ((currentEnclosingType = currentType.enclosingType()) != null) {
 954
 955                                 //done?
 956                                 if (currentType == targetEnclosingType
 957                                         || (!onlyExactMatch && targetEnclosingType.isSuperclassOf(currentType)))        break;
 958
 959                                 if (currentMethodScope != null) {
 960                                         currentMethodScope = currentMethodScope.enclosingMethodScope();
 961                                         if (currentMethodScope != null && currentMethodScope.isConstructorCall){
 962                                                 return NoEnclosingInstanceInConstructorCall;
 963                                         }
 964                                         if (currentMethodScope != null && currentMethodScope.isStatic){
 965                                                 return NoEnclosingInstanceInStaticContext;
 966                                         }
 967                                 }
 968
 969                                 syntheticField = ((NestedTypeBinding) currentType).getSyntheticField((SourceTypeBinding) currentEnclosingType, onlyExactMatch);
 970                                 if (syntheticField == null) break;
 971
 972                                 // append inside the path
 973                                 if (count == path.length) {
 974                                         System.arraycopy(path, 0, (path = new Object[count + 1]), 0, count);
 975                                 }
 976                                 // private access emulation is necessary since synthetic field is private
 977                                 path[count++] = ((SourceTypeBinding) syntheticField.declaringClass).addSyntheticMethod(syntheticField, true);
 978                                 currentType = currentEnclosingType;
 979                         }
 980                         if (currentType == targetEnclosingType
 981                                 || (!onlyExactMatch && targetEnclosingType.isSuperclassOf(currentType))) {
 982                                 return path;
 983                         }
 984                 }
 985                 return null;
 986         }
 987
 988         /* API
 989      *
 990          *      Answer the field binding that corresponds to fieldName.
 991          *      Start the lookup at the receiverType.
 992          *      InvocationSite implements
 993          *              isSuperAccess(); this is used to determine if the discovered field is visible.
 994          *      Only fields defined by the receiverType or its supertypes are answered;
 995          *      a field of an enclosing type will not be found using this API.
 996          *
 997          *      If no visible field is discovered, an error binding is answered.
 998          */
 999         public FieldBinding getField(
1000                 TypeBinding receiverType,
1001                 char[] fieldName,
1002                 InvocationSite invocationSite) {
1003
1004                 FieldBinding field = findField(receiverType, fieldName, invocationSite);
1005                 if (field == null)
1006                         return new ProblemFieldBinding(
1007                                 receiverType instanceof ReferenceBinding
1008                                         ? (ReferenceBinding) receiverType
1009                                         : null,
1010                                 fieldName,
1011                                 NotFound);
1012                 else
1013                         return field;
1014         }
1015
1016         /* API
1017      *
1018          *      Answer the method binding that corresponds to selector, argumentTypes.
1019          *      Start the lookup at the enclosing type of the receiver.
1020          *      InvocationSite implements
1021          *              isSuperAccess(); this is used to determine if the discovered method is visible.
1022          *              setDepth(int); this is used to record the depth of the discovered method
1023          *                      relative to the enclosing type of the receiver. (If the method is defined
1024          *                      in the enclosing type of the receiver, the depth is 0; in the next enclosing
1025          *                      type, the depth is 1; and so on
1026          *
1027          *      If no visible method is discovered, an error binding is answered.
1028          */
1029         public MethodBinding getImplicitMethod(
1030                 char[] selector,
1031                 TypeBinding[] argumentTypes,
1032                 InvocationSite invocationSite) {
1033
1034                 boolean insideStaticContext = false;
1035                 boolean insideConstructorCall = false;
1036                 MethodBinding foundMethod = null;
1037                 ProblemMethodBinding foundFuzzyProblem = null;
1038                 // the weird method lookup case (matches method name in scope, then arg types, then visibility)
1039                 ProblemMethodBinding foundInsideProblem = null;
1040                 // inside Constructor call or inside static context
1041                 Scope scope = this;
1042                 int depth = 0;
1043                 done : while (true) { // done when a COMPILATION_UNIT_SCOPE is found
1044                         switch (scope.kind) {
1045                                 case METHOD_SCOPE :
1046                                         MethodScope methodScope = (MethodScope) scope;
1047                                         insideStaticContext |= methodScope.isStatic;
1048                                         insideConstructorCall |= methodScope.isConstructorCall;
1049                                         break;
1050                                 case CLASS_SCOPE :
1051                                         ClassScope classScope = (ClassScope) scope;
1052                                         SourceTypeBinding receiverType = classScope.referenceContext.binding;
1053                                         boolean isExactMatch = true;
1054                                         // retrieve an exact visible match (if possible)
1055                                         MethodBinding methodBinding =
1056                                                 (foundMethod == null)
1057                                                         ? classScope.findExactMethod(
1058                                                                 receiverType,
1059                                                                 selector,
1060                                                                 argumentTypes,
1061                                                                 invocationSite)
1062                                                         : classScope.findExactMethod(
1063                                                                 receiverType,
1064                                                                 foundMethod.selector,
1065                                                                 foundMethod.parameters,
1066                                                                 invocationSite);
1067                                         //                                              ? findExactMethod(receiverType, selector, argumentTypes, invocationSite)
1068                                         //                                              : findExactMethod(receiverType, foundMethod.selector, foundMethod.parameters, invocationSite);
1069                                         if (methodBinding == null) {
1070                                                 // answers closest approximation, may not check argumentTypes or visibility
1071                                                 isExactMatch = false;
1072                                                 methodBinding =
1073                                                         classScope.findMethod(receiverType, selector, argumentTypes, invocationSite);
1074                                                 //                                      methodBinding = findMethod(receiverType, selector, argumentTypes, invocationSite);
1075                                         }
1076                                         if (methodBinding != null) { // skip it if we did not find anything
1077                                                 if (methodBinding.problemId() == Ambiguous) {
1078                                                         if (foundMethod == null || foundMethod.problemId() == NotVisible)
1079                                                                 // supercedes any potential InheritedNameHidesEnclosingName problem
1080                                                                 return methodBinding;
1081                                                         else
1082                                                                 // make the user qualify the method, likely wants the first inherited method (javac generates an ambiguous error instead)
1083                                                                 return new ProblemMethodBinding(
1084                                                                         selector,
1085                                                                         argumentTypes,
1086                                                                         InheritedNameHidesEnclosingName);
1087                                                 }
1088
1089                                                 ProblemMethodBinding fuzzyProblem = null;
1090                                                 ProblemMethodBinding insideProblem = null;
1091                                                 if (methodBinding.isValidBinding()) {
1092                                                         if (!isExactMatch) {
1093                                                                 if (!areParametersAssignable(methodBinding.parameters, argumentTypes)) {
1094                                                                         if (foundMethod == null || foundMethod.problemId() == NotVisible){
1095                                                                                 // inherited mismatch is reported directly, not looking at enclosing matches
1096                                                                                 return new ProblemMethodBinding(methodBinding, selector, argumentTypes, NotFound);
1097                                                                         }
1098                                                                         // make the user qualify the method, likely wants the first inherited method (javac generates an ambiguous error instead)
1099                                                                         fuzzyProblem = new ProblemMethodBinding(selector, methodBinding.parameters, InheritedNameHidesEnclosingName);
1100
1101                                                                 } else if (!methodBinding.canBeSeenBy(receiverType, invocationSite, classScope)) {
1102                                                                         // using <classScope> instead of <this> for visibility check does grant all access to innerclass
1103                                                                         fuzzyProblem =
1104                                                                                 new ProblemMethodBinding(
1105                                                                                         methodBinding,
1106                                                                                         selector,
1107                                                                                         methodBinding.parameters,
1108                                                                                         NotVisible);
1109                                                                 }
1110                                                         }
1111                                                         if (fuzzyProblem == null && !methodBinding.isStatic()) {
1112                                                                 if (insideConstructorCall) {
1113                                                                         insideProblem =
1114                                                                                 new ProblemMethodBinding(
1115                                                                                         methodBinding.selector,
1116                                                                                         methodBinding.parameters,
1117                                                                                         NonStaticReferenceInConstructorInvocation);
1118                                                                 } else if (insideStaticContext) {
1119                                                                         insideProblem =
1120                                                                                 new ProblemMethodBinding(
1121                                                                                         methodBinding.selector,
1122                                                                                         methodBinding.parameters,
1123                                                                                         NonStaticReferenceInStaticContext);
1124                                                                 }
1125                                                         }
1126
1127 //                                                      if (receiverType == methodBinding.declaringClass
1128 //                                                              || (receiverType.getMethods(selector)) != NoMethods
1129 //                                                              || ((fuzzyProblem == null || fuzzyProblem.problemId() != NotVisible) && environment().options.complianceLevel >= CompilerOptions.JDK1_4)){
1130 //                                                              // found a valid method in the 'immediate' scope (ie. not inherited)
1131 //                                                              // OR the receiverType implemented a method with the correct name
1132 //                                                              // OR in 1.4 mode (inherited visible shadows enclosing)
1133 //                                                              if (foundMethod == null) {
1134 //                                                                      if (depth > 0){
1135 //                                                                              invocationSite.setDepth(depth);
1136 //                                                                              invocationSite.setActualReceiverType(receiverType);
1137 //                                                                      }
1138 //                                                                      // return the methodBinding if it is not declared in a superclass of the scope's binding (that is, inherited)
1139 //                                                                      if (fuzzyProblem != null)
1140 //                                                                              return fuzzyProblem;
1141 //                                                                      if (insideProblem != null)
1142 //                                                                              return insideProblem;
1143 //                                                                      return methodBinding;
1144 //                                                              }
1145 //                                                              // if a method was found, complain when another is found in an 'immediate' enclosing type (that is, not inherited)
1146 //                                                              // NOTE: Unlike fields, a non visible method hides a visible method
1147 //                                                              if (foundMethod.declaringClass != methodBinding.declaringClass)
1148 //                                                                      // ie. have we found the same method - do not trust field identity yet
1149 //                                                                      return new ProblemMethodBinding(
1150 //                                                                              methodBinding.selector,
1151 //                                                                              methodBinding.parameters,
1152 //                                                                              InheritedNameHidesEnclosingName);
1153 //                                                      }
1154                                                 }
1155
1156                                                 if (foundMethod == null
1157                                                         || (foundMethod.problemId() == NotVisible
1158                                                                 && methodBinding.problemId() != NotVisible)) {
1159                                                         // only remember the methodBinding if its the first one found or the previous one was not visible & methodBinding is...
1160                                                         // remember that private methods are visible if defined directly by an enclosing class
1161                                                         if (depth > 0){
1162                                                                 invocationSite.setDepth(depth);
1163                                                                 invocationSite.setActualReceiverType(receiverType);
1164                                                         }
1165                                                         foundFuzzyProblem = fuzzyProblem;
1166                                                         foundInsideProblem = insideProblem;
1167                                                         if (fuzzyProblem == null)
1168                                                                 foundMethod = methodBinding; // only keep it if no error was found
1169                                                 }
1170                                         }
1171                                         depth++;
1172                                         insideStaticContext |= receiverType.isStatic();
1173                                         // 1EX5I8Z - accessing outer fields within a constructor call is permitted
1174                                         // in order to do so, we change the flag as we exit from the type, not the method
1175                                         // itself, because the class scope is used to retrieve the fields.
1176                                         MethodScope enclosingMethodScope = scope.methodScope();
1177                                         insideConstructorCall =
1178                                                 enclosingMethodScope == null ? false : enclosingMethodScope.isConstructorCall;
1179                                         break;
1180                                 case COMPILATION_UNIT_SCOPE :
1181                                         break done;
1182                         }
1183                         scope = scope.parent;
1184                 }
1185
1186                 if (foundFuzzyProblem != null)
1187                         return foundFuzzyProblem;
1188                 if (foundInsideProblem != null)
1189                         return foundInsideProblem;
1190                 if (foundMethod != null)
1191                         return foundMethod;
1192                 return new ProblemMethodBinding(selector, argumentTypes, NotFound);
1193         }
1194
1195         /* API
1196      *
1197          *      Answer the method binding that corresponds to selector, argumentTypes.
1198          *      Start the lookup at the receiverType.
1199          *      InvocationSite implements
1200          *              isSuperAccess(); this is used to determine if the discovered method is visible.
1201          *
1202          *      Only methods defined by the receiverType or its supertypes are answered;
1203          *      use getImplicitMethod() to discover methods of enclosing types.
1204          *
1205          *      If no visible method is discovered, an error binding is answered.
1206          */
1207         public MethodBinding getMethod(
1208                 TypeBinding receiverType,
1209                 char[] selector,
1210                 TypeBinding[] argumentTypes,
1211                 InvocationSite invocationSite) {
1212
1213                 if (receiverType.isArrayType())
1214                         return findMethodForArray(
1215                                 (ArrayBinding) receiverType,
1216                                 selector,
1217                                 argumentTypes,
1218                                 invocationSite);
1219                 if (receiverType.isBaseType())
1220                         return new ProblemMethodBinding(selector, argumentTypes, NotFound);
1221
1222                 ReferenceBinding currentType = (ReferenceBinding) receiverType;
1223                 if (!currentType.canBeSeenBy(this))
1224                         return new ProblemMethodBinding(selector, argumentTypes, ReceiverTypeNotVisible);
1225
1226                 // retrieve an exact visible match (if possible)
1227                 MethodBinding methodBinding =
1228                         findExactMethod(currentType, selector, argumentTypes, invocationSite);
1229                 if (methodBinding != null)
1230                         return methodBinding;
1231
1232                 // answers closest approximation, may not check argumentTypes or visibility
1233                 methodBinding =
1234                         findMethod(currentType, selector, argumentTypes, invocationSite);
1235                 if (methodBinding == null)
1236                         return new ProblemMethodBinding(selector, argumentTypes, NotFound);
1237                 if (methodBinding.isValidBinding()) {
1238                         if (!areParametersAssignable(methodBinding.parameters, argumentTypes))
1239                                 return new ProblemMethodBinding(
1240                                         methodBinding,
1241                                         selector,
1242                                         argumentTypes,
1243                                         NotFound);
1244                         if (!methodBinding.canBeSeenBy(currentType, invocationSite, this))
1245                                 return new ProblemMethodBinding(
1246                                         methodBinding,
1247                                         selector,
1248                                         methodBinding.parameters,
1249                                         NotVisible);
1250                 }
1251                 return methodBinding;
1252         }
1253
1254         public int maxShiftedOffset() {
1255                 int max = -1;
1256                 if (this.shiftScopes != null){
1257                         for (int i = 0, length = this.shiftScopes.length; i < length; i++){
1258                                 int subMaxOffset = this.shiftScopes[i].maxOffset;
1259                                 if (subMaxOffset > max) max = subMaxOffset;
1260                         }
1261                 }
1262                 return max;
1263         }
1264
1265         /* Answer the problem reporter to use for raising new problems.
1266          *
1267          * Note that as a side-effect, this updates the current reference context
1268          * (unit, type or method) in case the problem handler decides it is necessary
1269          * to abort.
1270          */
1271         public ProblemReporter problemReporter() {
1272
1273                 return outerMostMethodScope().problemReporter();
1274         }
1275
1276         /*
1277          * Code responsible to request some more emulation work inside the invocation type, so as to supply
1278          * correct synthetic arguments to any allocation of the target type.
1279          */
1280         public void propagateInnerEmulation(ReferenceBinding targetType, boolean isEnclosingInstanceSupplied) {
1281
1282                 // no need to propagate enclosing instances, they got eagerly allocated already.
1283
1284                 SyntheticArgumentBinding[] syntheticArguments;
1285                 if ((syntheticArguments = targetType.syntheticOuterLocalVariables()) != null) {
1286                         for (int i = 0, max = syntheticArguments.length; i < max; i++) {
1287                                 SyntheticArgumentBinding syntheticArg = syntheticArguments[i];
1288                                 // need to filter out the one that could match a supplied enclosing instance
1289                                 if (!(isEnclosingInstanceSupplied
1290                                         && (syntheticArg.type == targetType.enclosingType()))) {
1291                                         this.emulateOuterAccess(syntheticArg.actualOuterLocalVariable);
1292                                 }
1293                         }
1294                 }
1295         }
1296
1297         /* Answer the reference type of this scope.
1298          *
1299          * It is the nearest enclosing type of this scope.
1300          */
1301         public TypeDeclaration referenceType() {
1302
1303                 return methodScope().referenceType();
1304         }
1305
1306         // start position in this scope - for ordering scopes vs. variables
1307         int startIndex() {
1308                 return startIndex;
1309         }
1310
1311         public String toString() {
1312                 return toString(0);
1313         }
1314
1315         public String toString(int tab) {
1316
1317                 String s = basicToString(tab);
1318                 for (int i = 0; i < scopeIndex; i++)
1319                         if (subscopes[i] instanceof BlockScope)
1320                                 s += ((BlockScope) subscopes[i]).toString(tab + 1) + "\n"; //$NON-NLS-1$
1321                 return s;
1322         }
1323 }