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.internal.compiler.lookup.ReferenceBinding;
  14
  15 import net.sourceforge.phpdt.core.compiler.CharOperation;
  16 import net.sourceforge.phpdt.internal.compiler.problem.ProblemReporter;
  17 import net.sourceforge.phpeclipse.internal.compiler.ast.AbstractMethodDeclaration;
  18 import net.sourceforge.phpeclipse.internal.compiler.ast.ConstructorDeclaration;
  19 import net.sourceforge.phpeclipse.internal.compiler.ast.TypeDeclaration;
  20
  21 public class BlockScope extends Scope {
  22
  23         // Local variable management
  24         public LocalVariableBinding[] locals;
  25         public int localIndex; // position for next variable
  26         public int startIndex;  // start position in this scope - for ordering scopes vs. variables
  27         public int offset; // for variable allocation throughout scopes
  28         public int maxOffset; // for variable allocation throughout scopes
  29
  30         // finally scopes must be shifted behind respective try&catch scope(s) so as to avoid
  31         // collisions of secret variables (return address, save value).
  32         public BlockScope[] shiftScopes;
  33
  34         public final static VariableBinding[] EmulationPathToImplicitThis = {};
  35         public final static VariableBinding[] NoEnclosingInstanceInConstructorCall = {};
  36         public final static VariableBinding[] NoEnclosingInstanceInStaticContext = {};
  37
  38         public Scope[] subscopes = new Scope[1]; // need access from code assist
  39         public int scopeIndex = 0; // need access from code assist
  40
  41         protected BlockScope(int kind, Scope parent) {
  42
  43                 super(kind, parent);
  44         }
  45
  46         public BlockScope(BlockScope parent) {
  47
  48                 this(parent, true);
  49         }
  50
  51         public BlockScope(BlockScope parent, boolean addToParentScope) {
  52
  53                 this(BLOCK_SCOPE, parent);
  54                 locals = new LocalVariableBinding[5];
  55                 if (addToParentScope) parent.addSubscope(this);
  56                 this.startIndex = parent.localIndex;
  57         }
  58
  59         public BlockScope(BlockScope parent, int variableCount) {
  60
  61                 this(BLOCK_SCOPE, parent);
  62                 locals = new LocalVariableBinding[variableCount];
  63                 parent.addSubscope(this);
  64                 this.startIndex = parent.localIndex;
  65         }
  66
  67         /* Create the class scope & binding for the anonymous type.
  68          */
  69         public final void addAnonymousType(
  70                 TypeDeclaration anonymousType,
  71                 ReferenceBinding superBinding) {
  72
  73                 ClassScope anonymousClassScope = new ClassScope(this, anonymousType);
  74                 anonymousClassScope.buildAnonymousTypeBinding(
  75                         enclosingSourceType(),
  76                         superBinding);
  77         }
  78
  79         /* Create the class scope & binding for the local type.
  80          */
  81         public final void addLocalType(TypeDeclaration localType) {
  82
  83                 // check that the localType does not conflict with an enclosing type
  84                 ReferenceBinding type = enclosingSourceType();
  85                 do {
  86                         if (CharOperation.equals(type.sourceName, localType.name)) {
  87                                 problemReporter().hidingEnclosingType(localType);
  88                                 return;
  89                         }
  90                         type = type.enclosingType();
  91                 } while (type != null);
  92
  93                 // check that the localType does not conflict with another sibling local type
  94                 Scope scope = this;
  95                 do {
  96                         if (((BlockScope) scope).findLocalType(localType.name) != null) {
  97                                 problemReporter().duplicateNestedType(localType);
  98                                 return;
  99                         }
 100                 } while ((scope = scope.parent) instanceof BlockScope);
 101
 102                 ClassScope localTypeScope = new ClassScope(this, localType);
 103                 addSubscope(localTypeScope);
 104                 localTypeScope.buildLocalTypeBinding(enclosingSourceType());
 105         }
 106
 107         /* Insert a local variable into a given scope, updating its position
 108          * and checking there are not too many locals or arguments allocated.
 109          */
 110         public final void addLocalVariable(LocalVariableBinding binding) {
 111
 112                 checkAndSetModifiersForVariable(binding);
 113
 114                 // insert local in scope
 115                 if (localIndex == locals.length)
 116                         System.arraycopy(
 117                                 locals,
 118                                 0,
 119                                 (locals = new LocalVariableBinding[localIndex * 2]),
 120                                 0,
 121                                 localIndex);
 122                 locals[localIndex++] = binding;
 123
 124                 // update local variable binding
 125                 binding.declaringScope = this;
 126                 binding.id = this.outerMostMethodScope().analysisIndex++;
 127                 // share the outermost method scope analysisIndex
 128         }
 129
 130         public void addSubscope(Scope childScope) {
 131                 if (scopeIndex == subscopes.length)
 132                         System.arraycopy(
 133                                 subscopes,
 134                                 0,
 135                                 (subscopes = new Scope[scopeIndex * 2]),
 136                                 0,
 137                                 scopeIndex);
 138                 subscopes[scopeIndex++] = childScope;
 139         }
 140
 141         /* Answer true if the receiver is suitable for assigning final blank fields.
 142          *
 143          * in other words, it is inside an initializer, a constructor or a clinit
 144          */
 145         public final boolean allowBlankFinalFieldAssignment(FieldBinding binding) {
 146
 147                 if (enclosingSourceType() != binding.declaringClass)
 148                         return false;
 149
 150                 MethodScope methodScope = methodScope();
 151                 if (methodScope.isStatic != binding.isStatic())
 152                         return false;
 153                 return methodScope.isInsideInitializer() // inside initializer
 154                                 || ((AbstractMethodDeclaration) methodScope.referenceContext)
 155                                         .isInitializationMethod(); // inside constructor or clinit
 156         }
 157         String basicToString(int tab) {
 158                 String newLine = "\n"; //$NON-NLS-1$
 159                 for (int i = tab; --i >= 0;)
 160                         newLine += "\t"; //$NON-NLS-1$
 161
 162                 String s = newLine + "--- Block Scope ---"; //$NON-NLS-1$
 163                 newLine += "\t"; //$NON-NLS-1$
 164                 s += newLine + "locals:"; //$NON-NLS-1$
 165                 for (int i = 0; i < localIndex; i++)
 166                         s += newLine + "\t" + locals[i].toString(); //$NON-NLS-1$
 167                 s += newLine + "startIndex = " + startIndex; //$NON-NLS-1$
 168                 return s;
 169         }
 170
 171         private void checkAndSetModifiersForVariable(LocalVariableBinding varBinding) {
 172
 173                 int modifiers = varBinding.modifiers;
 174                 if ((modifiers & AccAlternateModifierProblem) != 0 && varBinding.declaration != null){
 175                         problemReporter().duplicateModifierForVariable(varBinding.declaration, this instanceof MethodScope);
 176                 }
 177                 int realModifiers = modifiers & AccJustFlag;
 178
 179                 int unexpectedModifiers = ~AccFinal;
 180                 if ((realModifiers & unexpectedModifiers) != 0 && varBinding.declaration != null){
 181                         problemReporter().illegalModifierForVariable(varBinding.declaration, this instanceof MethodScope);
 182                 }
 183                 varBinding.modifiers = modifiers;
 184         }
 185
 186         /* Compute variable positions in scopes given an initial position offset
 187          * ignoring unused local variables.
 188          *
 189          * No argument is expected here (ilocal is the first non-argument local of the outermost scope)
 190          * Arguments are managed by the MethodScope method
 191          */
 192 //      void computeLocalVariablePositions(int ilocal, int initOffset, CodeStream codeStream) {
 193 //
 194 //              this.offset = initOffset;
 195 //              this.maxOffset = initOffset;
 196 //
 197 //              // local variable init
 198 //              int maxLocals = this.localIndex;
 199 //              boolean hasMoreVariables = ilocal < maxLocals;
 200 //
 201 //              // scope init
 202 //              int iscope = 0, maxScopes = this.scopeIndex;
 203 //              boolean hasMoreScopes = maxScopes > 0;
 204 //
 205 //              // iterate scopes and variables in parallel
 206 //              while (hasMoreVariables || hasMoreScopes) {
 207 //                      if (hasMoreScopes
 208 //                              && (!hasMoreVariables || (subscopes[iscope].startIndex() <= ilocal))) {
 209 //                              // consider subscope first
 210 //                              if (subscopes[iscope] instanceof BlockScope) {
 211 //                                      BlockScope subscope = (BlockScope) subscopes[iscope];
 212 //                                      int subOffset = subscope.shiftScopes == null ? this.offset : subscope.maxShiftedOffset();
 213 //                                      subscope.computeLocalVariablePositions(0, subOffset, codeStream);
 214 //                                      if (subscope.maxOffset > this.maxOffset)
 215 //                                              this.maxOffset = subscope.maxOffset;
 216 //                              }
 217 //                              hasMoreScopes = ++iscope < maxScopes;
 218 //                      } else {
 219 //
 220 //                              // consider variable first
 221 //                              LocalVariableBinding local = locals[ilocal]; // if no local at all, will be locals[ilocal]==null
 222 //
 223 //                              // check if variable is actually used, and may force it to be preserved
 224 //                              boolean generateCurrentLocalVar = (local.useFlag == LocalVariableBinding.USED && (local.constant == Constant.NotAConstant));
 225 //
 226 //                              // do not report fake used variable
 227 //                              if (local.useFlag == LocalVariableBinding.UNUSED
 228 //                                      && (local.declaration != null) // unused (and non secret) local
 229 //                                      && ((local.declaration.bits & ASTNode.IsLocalDeclarationReachableMASK) != 0)) { // declaration is reachable
 230 //
 231 //                                      if (!(local.declaration instanceof Argument))  // do not report unused catch arguments
 232 //                                              this.problemReporter().unusedLocalVariable(local.declaration);
 233 //                              }
 234 //
 235 //                              // could be optimized out, but does need to preserve unread variables ?
 236 ////                            if (!generateCurrentLocalVar) {
 237 ////                                    if (local.declaration != null && environment().options.preserveAllLocalVariables) {
 238 ////                                            generateCurrentLocalVar = true; // force it to be preserved in the generated code
 239 ////                                            local.useFlag = LocalVariableBinding.USED;
 240 ////                                    }
 241 ////                            }
 242 //
 243 //                              // allocate variable
 244 //                              if (generateCurrentLocalVar) {
 245 //
 246 //                                      if (local.declaration != null) {
 247 //                                              codeStream.record(local); // record user-defined local variables for attribute generation
 248 //                                      }
 249 //                                      // assign variable position
 250 //                                      local.resolvedPosition = this.offset;
 251 //
 252 //                                      if ((local.type == LongBinding) || (local.type == DoubleBinding)) {
 253 //                                              this.offset += 2;
 254 //                                      } else {
 255 //                                              this.offset++;
 256 //                                      }
 257 //                                      if (this.offset > 0xFFFF) { // no more than 65535 words of locals
 258 //                                              this.problemReporter().noMoreAvailableSpaceForLocal(
 259 //                                                      local,
 260 //                                                      local.declaration == null ? (ASTNode)this.methodScope().referenceContext : local.declaration);
 261 //                                      }
 262 //                              } else {
 263 //                                      local.resolvedPosition = -1; // not generated
 264 //                              }
 265 //                              hasMoreVariables = ++ilocal < maxLocals;
 266 //                      }
 267 //              }
 268 //              if (this.offset > this.maxOffset)
 269 //                      this.maxOffset = this.offset;
 270 //      }
 271
 272         /* Answer true if the variable name already exists within the receiver's scope.
 273          */
 274         public final LocalVariableBinding duplicateName(char[] name) {
 275                 for (int i = 0; i < localIndex; i++)
 276                         if (CharOperation.equals(name, locals[i].name))
 277                                 return locals[i];
 278
 279                 if (this instanceof MethodScope)
 280                         return null;
 281                 else
 282                         return ((BlockScope) parent).duplicateName(name);
 283         }
 284
 285         /*
 286          *      Record the suitable binding denoting a synthetic field or constructor argument,
 287          * mapping to the actual outer local variable in the scope context.
 288          * Note that this may not need any effect, in case the outer local variable does not
 289          * need to be emulated and can directly be used as is (using its back pointer to its
 290          * declaring scope).
 291          */
 292         public void emulateOuterAccess(LocalVariableBinding outerLocalVariable) {
 293
 294                 MethodScope currentMethodScope;
 295                 if ((currentMethodScope = this.methodScope())
 296                         != outerLocalVariable.declaringScope.methodScope()) {
 297                         NestedTypeBinding currentType = (NestedTypeBinding) this.enclosingSourceType();
 298
 299                         //do nothing for member types, pre emulation was performed already
 300                         if (!currentType.isLocalType()) {
 301                                 return;
 302                         }
 303                         // must also add a synthetic field if we're not inside a constructor
 304                         if (!currentMethodScope.isInsideInitializerOrConstructor()) {
 305                                 currentType.addSyntheticArgumentAndField(outerLocalVariable);
 306                         } else {
 307                                 currentType.addSyntheticArgument(outerLocalVariable);
 308                         }
 309                 }
 310         }
 311
 312         /* Note that it must never produce a direct access to the targetEnclosingType,
 313          * but instead a field sequence (this$2.this$1.this$0) so as to handle such a test case:
 314          *
 315          * class XX {
 316          *      void foo() {
 317          *              class A {
 318          *                      class B {
 319          *                              class C {
 320          *                                      boolean foo() {
 321          *                                              return (Object) A.this == (Object) B.this;
 322          *                                      }
 323          *                              }
 324          *                      }
 325          *              }
 326          *              new A().new B().new C();
 327          *      }
 328          * }
 329          * where we only want to deal with ONE enclosing instance for C (could not figure out an A for C)
 330          */
 331         public final ReferenceBinding findLocalType(char[] name) {
 332
 333                 for (int i = 0, length = scopeIndex; i < length; i++) {
 334                         if (subscopes[i] instanceof ClassScope) {
 335                                 SourceTypeBinding sourceType =
 336                                         ((ClassScope) subscopes[i]).referenceContext.binding;
 337                                 if (CharOperation.equals(sourceType.sourceName(), name))
 338                                         return sourceType;
 339                         }
 340                 }
 341                 return null;
 342         }
 343
 344         public LocalVariableBinding findVariable(char[] variable) {
 345
 346                 int variableLength = variable.length;
 347                 for (int i = 0, length = locals.length; i < length; i++) {
 348                         LocalVariableBinding local = locals[i];
 349                         if (local == null)
 350                                 return null;
 351                         if (local.name.length == variableLength
 352                                 && CharOperation.prefixEquals(local.name, variable))
 353                                 return local;
 354                 }
 355                 return null;
 356         }
 357         /* API
 358      * flag is a mask of the following values VARIABLE (= FIELD or LOCAL), TYPE.
 359          * Only bindings corresponding to the mask will be answered.
 360          *
 361          *      if the VARIABLE mask is set then
 362          *              If the first name provided is a field (or local) then the field (or local) is answered
 363          *              Otherwise, package names and type names are consumed until a field is found.
 364          *              In this case, the field is answered.
 365          *
 366          *      if the TYPE mask is set,
 367          *              package names and type names are consumed until the end of the input.
 368          *              Only if all of the input is consumed is the type answered
 369          *
 370          *      All other conditions are errors, and a problem binding is returned.
 371          *
 372          *      NOTE: If a problem binding is returned, senders should extract the compound name
 373          *      from the binding & not assume the problem applies to the entire compoundName.
 374          *
 375          *      The VARIABLE mask has precedence over the TYPE mask.
 376          *
 377          *      InvocationSite implements
 378          *              isSuperAccess(); this is used to determine if the discovered field is visible.
 379          *              setFieldIndex(int); this is used to record the number of names that were consumed.
 380          *
 381          *      For example, getBinding({"foo","y","q", VARIABLE, site) will answer
 382          *      the binding for the field or local named "foo" (or an error binding if none exists).
 383          *      In addition, setFieldIndex(1) will be sent to the invocation site.
 384          *      If a type named "foo" exists, it will not be detected (and an error binding will be answered)
 385          *
 386          *      IMPORTANT NOTE: This method is written under the assumption that compoundName is longer than length 1.
 387          */
 388         public Binding getBinding(char[][] compoundName, int mask, InvocationSite invocationSite) {
 389
 390                 Binding binding = getBinding(compoundName[0], mask | TYPE | PACKAGE, invocationSite);
 391                 invocationSite.setFieldIndex(1);
 392                 if (binding instanceof VariableBinding) return binding;
 393                 compilationUnitScope().recordSimpleReference(compoundName[0]);
 394                 if (!binding.isValidBinding()) return binding;
 395
 396                 int length = compoundName.length;
 397                 int currentIndex = 1;
 398                 foundType : if (binding instanceof PackageBinding) {
 399                         PackageBinding packageBinding = (PackageBinding) binding;
 400                         while (currentIndex < length) {
 401                                 compilationUnitScope().recordReference(packageBinding.compoundName, compoundName[currentIndex]);
 402                                 binding = packageBinding.getTypeOrPackage(compoundName[currentIndex++]);
 403                                 invocationSite.setFieldIndex(currentIndex);
 404                                 if (binding == null) {
 405                                         if (currentIndex == length)
 406                                                 // must be a type if its the last name, otherwise we have no idea if its a package or type
 407                                                 return new ProblemReferenceBinding(
 408                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 409                                                         NotFound);
 410                                         else
 411                                                 return new ProblemBinding(
 412                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 413                                                         NotFound);
 414                                 }
 415                                 if (binding instanceof ReferenceBinding) {
 416                                         if (!binding.isValidBinding())
 417                                                 return new ProblemReferenceBinding(
 418                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 419                                                         binding.problemId());
 420                                         if (!((ReferenceBinding) binding).canBeSeenBy(this))
 421                                                 return new ProblemReferenceBinding(
 422                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 423                                                         (ReferenceBinding)binding,
 424                                                         NotVisible);
 425                                         break foundType;
 426                                 }
 427                                 packageBinding = (PackageBinding) binding;
 428                         }
 429
 430                         // It is illegal to request a PACKAGE from this method.
 431                         return new ProblemReferenceBinding(
 432                                 CharOperation.subarray(compoundName, 0, currentIndex),
 433                                 NotFound);
 434                 }
 435
 436                 // know binding is now a ReferenceBinding
 437                 while (currentIndex < length) {
 438                         ReferenceBinding typeBinding = (ReferenceBinding) binding;
 439                         char[] nextName = compoundName[currentIndex++];
 440                         invocationSite.setFieldIndex(currentIndex);
 441                         invocationSite.setActualReceiverType(typeBinding);
 442                         if ((mask & FIELD) != 0 && (binding = findField(typeBinding, nextName, invocationSite)) != null) {
 443                                 if (!binding.isValidBinding())
 444                                         return new ProblemFieldBinding(
 445                                                 ((FieldBinding) binding).declaringClass,
 446                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 447                                                 binding.problemId());
 448                                 break; // binding is now a field
 449                         }
 450                         if ((binding = findMemberType(nextName, typeBinding)) == null) {
 451                                 if ((mask & FIELD) != 0) {
 452                                         return new ProblemBinding(
 453                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 454                                                 typeBinding,
 455                                                 NotFound);
 456                                 } else {
 457                                         return new ProblemReferenceBinding(
 458                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 459                                                 typeBinding,
 460                                                 NotFound);
 461                                 }
 462                         }
 463                         if (!binding.isValidBinding())
 464                                 return new ProblemReferenceBinding(
 465                                         CharOperation.subarray(compoundName, 0, currentIndex),
 466                                         binding.problemId());
 467                 }
 468
 469                 if ((mask & FIELD) != 0 && (binding instanceof FieldBinding)) {
 470                         // was looking for a field and found a field
 471                         FieldBinding field = (FieldBinding) binding;
 472                         if (!field.isStatic())
 473                                 return new ProblemFieldBinding(
 474                                         field.declaringClass,
 475                                         CharOperation.subarray(compoundName, 0, currentIndex),
 476                                         NonStaticReferenceInStaticContext);
 477                         return binding;
 478                 }
 479                 if ((mask & TYPE) != 0 && (binding instanceof ReferenceBinding)) {
 480                         // was looking for a type and found a type
 481                         return binding;
 482                 }
 483
 484                 // handle the case when a field or type was asked for but we resolved the compoundName to a type or field
 485                 return new ProblemBinding(
 486                         CharOperation.subarray(compoundName, 0, currentIndex),
 487                         NotFound);
 488         }
 489
 490         // Added for code assist... NOT Public API
 491         public final Binding getBinding(
 492                 char[][] compoundName,
 493                 InvocationSite invocationSite) {
 494                 int currentIndex = 0;
 495                 int length = compoundName.length;
 496                 Binding binding =
 497                         getBinding(
 498                                 compoundName[currentIndex++],
 499                                 VARIABLE | TYPE | PACKAGE,
 500                                 invocationSite);
 501                 if (!binding.isValidBinding())
 502                         return binding;
 503
 504                 foundType : if (binding instanceof PackageBinding) {
 505                         while (currentIndex < length) {
 506                                 PackageBinding packageBinding = (PackageBinding) binding;
 507                                 binding = packageBinding.getTypeOrPackage(compoundName[currentIndex++]);
 508                                 if (binding == null) {
 509                                         if (currentIndex == length)
 510                                                 // must be a type if its the last name, otherwise we have no idea if its a package or type
 511                                                 return new ProblemReferenceBinding(
 512                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 513                                                         NotFound);
 514                                         else
 515                                                 return new ProblemBinding(
 516                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 517                                                         NotFound);
 518                                 }
 519                                 if (binding instanceof ReferenceBinding) {
 520                                         if (!binding.isValidBinding())
 521                                                 return new ProblemReferenceBinding(
 522                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 523                                                         binding.problemId());
 524                                         if (!((ReferenceBinding) binding).canBeSeenBy(this))
 525                                                 return new ProblemReferenceBinding(
 526                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 527                                                         (ReferenceBinding)binding,
 528                                                         NotVisible);
 529                                         break foundType;
 530                                 }
 531                         }
 532                         return binding;
 533                 }
 534
 535                 foundField : if (binding instanceof ReferenceBinding) {
 536                         while (currentIndex < length) {
 537                                 ReferenceBinding typeBinding = (ReferenceBinding) binding;
 538                                 char[] nextName = compoundName[currentIndex++];
 539                                 if ((binding = findField(typeBinding, nextName, invocationSite)) != null) {
 540                                         if (!binding.isValidBinding())
 541                                                 return new ProblemFieldBinding(
 542                                                         ((FieldBinding) binding).declaringClass,
 543                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 544                                                         binding.problemId());
 545                                         if (!((FieldBinding) binding).isStatic())
 546                                                 return new ProblemFieldBinding(
 547                                                         ((FieldBinding) binding).declaringClass,
 548                                                         CharOperation.subarray(compoundName, 0, currentIndex),
 549                                                         NonStaticReferenceInStaticContext);
 550                                         break foundField; // binding is now a field
 551                                 }
 552                                 if ((binding = findMemberType(nextName, typeBinding)) == null)
 553                                         return new ProblemBinding(
 554                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 555                                                 typeBinding,
 556                                                 NotFound);
 557                                 if (!binding.isValidBinding())
 558                                         return new ProblemReferenceBinding(
 559                                                 CharOperation.subarray(compoundName, 0, currentIndex),
 560                                                 binding.problemId());
 561                         }
 562                         return binding;
 563                 }
 564
 565                 VariableBinding variableBinding = (VariableBinding) binding;
 566                 while (currentIndex < length) {
 567                         TypeBinding typeBinding = variableBinding.type;
 568                         if (typeBinding == null)
 569                                 return new ProblemFieldBinding(
 570                                         null,
 571                                         CharOperation.subarray(compoundName, 0, currentIndex + 1),
 572                                         NotFound);
 573                         variableBinding =
 574                                 findField(typeBinding, compoundName[currentIndex++], invocationSite);
 575                         if (variableBinding == null)
 576                                 return new ProblemFieldBinding(
 577                                         null,
 578                                         CharOperation.subarray(compoundName, 0, currentIndex),
 579                                         NotFound);
 580                         if (!variableBinding.isValidBinding())
 581                                 return variableBinding;
 582                 }
 583                 return variableBinding;
 584         }
 585
 586         /* API
 587      *
 588          *      Answer the binding that corresponds to the argument name.
 589          *      flag is a mask of the following values VARIABLE (= FIELD or LOCAL), TYPE, PACKAGE.
 590          *      Only bindings corresponding to the mask can be answered.
 591          *
 592          *      For example, getBinding("foo", VARIABLE, site) will answer
 593          *      the binding for the field or local named "foo" (or an error binding if none exists).
 594          *      If a type named "foo" exists, it will not be detected (and an error binding will be answered)
 595          *
 596          *      The VARIABLE mask has precedence over the TYPE mask.
 597          *
 598          *      If the VARIABLE mask is not set, neither fields nor locals will be looked for.
 599          *
 600          *      InvocationSite implements:
 601          *              isSuperAccess(); this is used to determine if the discovered field is visible.
 602          *
 603          *      Limitations: cannot request FIELD independently of LOCAL, or vice versa
 604          */
 605         public Binding getBinding(char[] name, int mask, InvocationSite invocationSite) {
 606
 607                 Binding binding = null;
 608                 FieldBinding problemField = null;
 609                 if ((mask & VARIABLE) != 0) {
 610                         if (this.kind == BLOCK_SCOPE || this.kind == METHOD_SCOPE) {
 611                                 LocalVariableBinding variableBinding = findVariable(name);
 612                                 // looks in this scope only
 613                                 if (variableBinding != null) return variableBinding;
 614                         }
 615
 616                         boolean insideStaticContext = false;
 617                         boolean insideConstructorCall = false;
 618                         if (this.kind == METHOD_SCOPE) {
 619                                 MethodScope methodScope = (MethodScope) this;
 620                                 insideStaticContext |= methodScope.isStatic;
 621                                 insideConstructorCall |= methodScope.isConstructorCall;
 622                         }
 623
 624                         FieldBinding foundField = null;
 625                         // can be a problem field which is answered if a valid field is not found
 626                         ProblemFieldBinding foundInsideProblem = null;
 627                         // inside Constructor call or inside static context
 628                         Scope scope = parent;
 629                         int depth = 0;
 630                         int foundDepth = 0;
 631                         ReferenceBinding foundActualReceiverType = null;
 632                         done : while (true) { // done when a COMPILATION_UNIT_SCOPE is found
 633                                 switch (scope.kind) {
 634                                         case METHOD_SCOPE :
 635                                                 MethodScope methodScope = (MethodScope) scope;
 636                                                 insideStaticContext |= methodScope.isStatic;
 637                                                 insideConstructorCall |= methodScope.isConstructorCall;
 638                                                 // Fall through... could duplicate the code below to save a cast - questionable optimization
 639                                         case BLOCK_SCOPE :
 640                                                 LocalVariableBinding variableBinding = ((BlockScope) scope).findVariable(name);
 641                                                 // looks in this scope only
 642                                                 if (variableBinding != null) {
 643                                                         if (foundField != null && foundField.isValidBinding())
 644                                                                 return new ProblemFieldBinding(
 645                                                                         foundField.declaringClass,
 646                                                                         name,
 647                                                                         InheritedNameHidesEnclosingName);
 648                                                         if (depth > 0)
 649                                                                 invocationSite.setDepth(depth);
 650                                                         return variableBinding;
 651                                                 }
 652                                                 break;
 653                                         case CLASS_SCOPE :
 654                                                 ClassScope classScope = (ClassScope) scope;
 655                                                 SourceTypeBinding enclosingType = classScope.referenceContext.binding;
 656                                                 FieldBinding fieldBinding =
 657                                                         classScope.findField(enclosingType, name, invocationSite);
 658                                                 // Use next line instead if willing to enable protected access accross inner types
 659                                                 // FieldBinding fieldBinding = findField(enclosingType, name, invocationSite);
 660                                                 if (fieldBinding != null) { // skip it if we did not find anything
 661                                                         if (fieldBinding.problemId() == Ambiguous) {
 662                                                                 if (foundField == null || foundField.problemId() == NotVisible)
 663                                                                         // supercedes any potential InheritedNameHidesEnclosingName problem
 664                                                                         return fieldBinding;
 665                                                                 else
 666                                                                         // make the user qualify the field, likely wants the first inherited field (javac generates an ambiguous error instead)
 667                                                                         return new ProblemFieldBinding(
 668                                                                                 fieldBinding.declaringClass,
 669                                                                                 name,
 670                                                                                 InheritedNameHidesEnclosingName);
 671                                                         }
 672
 673                                                         ProblemFieldBinding insideProblem = null;
 674                                                         if (fieldBinding.isValidBinding()) {
 675                                                                 if (!fieldBinding.isStatic()) {
 676                                                                         if (insideConstructorCall) {
 677                                                                                 insideProblem =
 678                                                                                         new ProblemFieldBinding(
 679                                                                                                 fieldBinding.declaringClass,
 680                                                                                                 name,
 681                                                                                                 NonStaticReferenceInConstructorInvocation);
 682                                                                         } else if (insideStaticContext) {
 683                                                                                 insideProblem =
 684                                                                                         new ProblemFieldBinding(
 685                                                                                                 fieldBinding.declaringClass,
 686                                                                                                 name,
 687                                                                                                 NonStaticReferenceInStaticContext);
 688                                                                         }
 689                                                                 }
 690 //                                                              if (enclosingType == fieldBinding.declaringClass
 691 //                                                                      || environment().options.complianceLevel >= CompilerOptions.JDK1_4){
 692 //                                                                      // found a valid field in the 'immediate' scope (ie. not inherited)
 693 //                                                                      // OR in 1.4 mode (inherited shadows enclosing)
 694 //                                                                      if (foundField == null) {
 695 //                                                                              if (depth > 0){
 696 //                                                                                      invocationSite.setDepth(depth);
 697 //                                                                                      invocationSite.setActualReceiverType(enclosingType);
 698 //                                                                              }
 699 //                                                                              // return the fieldBinding if it is not declared in a superclass of the scope's binding (that is, inherited)
 700 //                                                                              return insideProblem == null ? fieldBinding : insideProblem;
 701 //                                                                      }
 702 //                                                                      if (foundField.isValidBinding())
 703 //                                                                              // if a valid field was found, complain when another is found in an 'immediate' enclosing type (that is, not inherited)
 704 //                                                                              if (foundField.declaringClass != fieldBinding.declaringClass)
 705 //                                                                                      // ie. have we found the same field - do not trust field identity yet
 706 //                                                                                      return new ProblemFieldBinding(
 707 //                                                                                              fieldBinding.declaringClass,
 708 //                                                                                              name,
 709 //                                                                                              InheritedNameHidesEnclosingName);
 710 //                                                              }
 711                                                         }
 712
 713                                                         if (foundField == null
 714                                                                 || (foundField.problemId() == NotVisible
 715                                                                         && fieldBinding.problemId() != NotVisible)) {
 716                                                                 // only remember the fieldBinding if its the first one found or the previous one was not visible & fieldBinding is...
 717                                                                 foundDepth = depth;
 718                                                                 foundActualReceiverType = enclosingType;
 719                                                                 foundInsideProblem = insideProblem;
 720                                                                 foundField = fieldBinding;
 721                                                         }
 722                                                 }
 723                                                 depth++;
 724                                                 insideStaticContext |= enclosingType.isStatic();
 725                                                 // 1EX5I8Z - accessing outer fields within a constructor call is permitted
 726                                                 // in order to do so, we change the flag as we exit from the type, not the method
 727                                                 // itself, because the class scope is used to retrieve the fields.
 728                                                 MethodScope enclosingMethodScope = scope.methodScope();
 729                                                 insideConstructorCall =
 730                                                         enclosingMethodScope == null ? false : enclosingMethodScope.isConstructorCall;
 731                                                 break;
 732                                         case COMPILATION_UNIT_SCOPE :
 733                                                 break done;
 734                                 }
 735                                 scope = scope.parent;
 736                         }
 737
 738                         if (foundInsideProblem != null){
 739                                 return foundInsideProblem;
 740                         }
 741                         if (foundField != null) {
 742                                 if (foundField.isValidBinding()){
 743                                         if (foundDepth > 0){
 744                                                 invocationSite.setDepth(foundDepth);
 745                                                 invocationSite.setActualReceiverType(foundActualReceiverType);
 746                                         }
 747                                         return foundField;
 748                                 }
 749                                 problemField = foundField;
 750                         }
 751                 }
 752
 753                 // We did not find a local or instance variable.
 754                 if ((mask & TYPE) != 0) {
 755                         if ((binding = getBaseType(name)) != null)
 756                                 return binding;
 757                         binding = getTypeOrPackage(name, (mask & PACKAGE) == 0 ? TYPE : TYPE | PACKAGE);
 758                         if (binding.isValidBinding() || mask == TYPE)
 759                                 return binding;
 760                         // answer the problem type binding if we are only looking for a type
 761                 } else if ((mask & PACKAGE) != 0) {
 762                         compilationUnitScope().recordSimpleReference(name);
 763                         if ((binding = environment().getTopLevelPackage(name)) != null)
 764                                 return binding;
 765                 }
 766                 if (problemField != null)
 767                         return problemField;
 768                 else
 769                         return new ProblemBinding(name, enclosingSourceType(), NotFound);
 770         }
 771
 772         /* API
 773          *
 774          *      Answer the constructor binding that corresponds to receiverType, argumentTypes.
 775          *
 776          *      InvocationSite implements
 777          *              isSuperAccess(); this is used to determine if the discovered constructor is visible.
 778          *
 779          *      If no visible constructor is discovered, an error binding is answered.
 780          */
 781         public MethodBinding getConstructor(
 782                 ReferenceBinding receiverType,
 783                 TypeBinding[] argumentTypes,
 784                 InvocationSite invocationSite) {
 785
 786                 compilationUnitScope().recordTypeReference(receiverType);
 787                 compilationUnitScope().recordTypeReferences(argumentTypes);
 788                 MethodBinding methodBinding = receiverType.getExactConstructor(argumentTypes);
 789                 if (methodBinding != null) {
 790                         if (methodBinding.canBeSeenBy(invocationSite, this))
 791                                 return methodBinding;
 792                 }
 793                 MethodBinding[] methods =
 794                         receiverType.getMethods(ConstructorDeclaration.ConstantPoolName);
 795                 if (methods == NoMethods) {
 796                         return new ProblemMethodBinding(
 797                                 ConstructorDeclaration.ConstantPoolName,
 798                                 argumentTypes,
 799                                 NotFound);
 800                 }
 801                 MethodBinding[] compatible = new MethodBinding[methods.length];
 802                 int compatibleIndex = 0;
 803                 for (int i = 0, length = methods.length; i < length; i++)
 804                         if (areParametersAssignable(methods[i].parameters, argumentTypes))
 805                                 compatible[compatibleIndex++] = methods[i];
 806                 if (compatibleIndex == 0)
 807                         return new ProblemMethodBinding(
 808                                 ConstructorDeclaration.ConstantPoolName,
 809                                 argumentTypes,
 810                                 NotFound);
 811                 // need a more descriptive error... cannot convert from X to Y
 812
 813                 MethodBinding[] visible = new MethodBinding[compatibleIndex];
 814                 int visibleIndex = 0;
 815                 for (int i = 0; i < compatibleIndex; i++) {
 816                         MethodBinding method = compatible[i];
 817                         if (method.canBeSeenBy(invocationSite, this))
 818                                 visible[visibleIndex++] = method;
 819                 }
 820                 if (visibleIndex == 1)
 821                         return visible[0];
 822                 if (visibleIndex == 0)
 823                         return new ProblemMethodBinding(
 824                                 compatible[0],
 825                                 ConstructorDeclaration.ConstantPoolName,
 826                                 compatible[0].parameters,
 827                                 NotVisible);
 828                 return mostSpecificClassMethodBinding(visible, visibleIndex);
 829         }
 830
 831         /*
 832          * This retrieves the argument that maps to an enclosing instance of the suitable type,
 833          *      if not found then answers nil -- do not create one
 834      *
 835          *              #implicitThis                                           : the implicit this will be ok
 836          *              #((arg) this$n)                                         : available as a constructor arg
 837          *              #((arg) this$n ... this$p)                      : available as as a constructor arg + a sequence of fields
 838          *              #((fieldDescr) this$n ... this$p)       : available as a sequence of fields
 839          *              nil                                                                                                     : not found
 840          *
 841          *      Note that this algorithm should answer the shortest possible sequence when
 842          *              shortcuts are available:
 843          *                              this$0 . this$0 . this$0
 844          *              instead of
 845          *                              this$2 . this$1 . this$0 . this$1 . this$0
 846          *              thus the code generation will be more compact and runtime faster
 847          */
 848         public VariableBinding[] getEmulationPath(LocalVariableBinding outerLocalVariable) {
 849
 850                 MethodScope currentMethodScope = this.methodScope();
 851                 SourceTypeBinding sourceType = currentMethodScope.enclosingSourceType();
 852
 853                 // identity check
 854                 if (currentMethodScope == outerLocalVariable.declaringScope.methodScope()) {
 855                         return new VariableBinding[] { outerLocalVariable };
 856                         // implicit this is good enough
 857                 }
 858                 // use synthetic constructor arguments if possible
 859                 if (currentMethodScope.isInsideInitializerOrConstructor()
 860                         && (sourceType.isNestedType())) {
 861                         SyntheticArgumentBinding syntheticArg;
 862                         if ((syntheticArg = ((NestedTypeBinding) sourceType).getSyntheticArgument(outerLocalVariable)) != null) {
 863                                 return new VariableBinding[] { syntheticArg };
 864                         }
 865                 }
 866                 // use a synthetic field then
 867                 if (!currentMethodScope.isStatic) {
 868                         FieldBinding syntheticField;
 869                         if ((syntheticField = sourceType.getSyntheticField(outerLocalVariable)) != null) {
 870                                 return new VariableBinding[] { syntheticField };
 871                         }
 872                 }
 873                 return null;
 874         }
 875
 876         /*
 877          * This retrieves the argument that maps to an enclosing instance of the suitable type,
 878          *      if not found then answers nil -- do not create one
 879          *
 880          *              #implicitThis                                                           :  the implicit this will be ok
 881          *              #((arg) this$n)                                                         : available as a constructor arg
 882          *              #((arg) this$n access$m... access$p)            : available as as a constructor arg + a sequence of synthetic accessors to synthetic fields
 883          *              #((fieldDescr) this$n access#m... access$p)     : available as a first synthetic field + a sequence of synthetic accessors to synthetic fields
 884          *              nil                                                                                                                             : not found
 885          *      jls 15.9.2
 886          */
 887         public Object[] getEmulationPath(
 888                         ReferenceBinding targetEnclosingType,
 889                         boolean onlyExactMatch,
 890                         boolean ignoreEnclosingArgInConstructorCall) {
 891                 //TODO: (philippe) investigate why exactly test76 fails if ignoreEnclosingArgInConstructorCall is always false
 892                 MethodScope currentMethodScope = this.methodScope();
 893                 SourceTypeBinding sourceType = currentMethodScope.enclosingSourceType();
 894
 895                 // identity check
 896                 if (!currentMethodScope.isStatic
 897                         && (!currentMethodScope.isConstructorCall || ignoreEnclosingArgInConstructorCall)
 898                         && (sourceType == targetEnclosingType
 899                                 || (!onlyExactMatch && targetEnclosingType.isSuperclassOf(sourceType)))) {
 900                         if (currentMethodScope.isConstructorCall) {
 901                                 return NoEnclosingInstanceInConstructorCall;
 902                         }
 903                         if (currentMethodScope.isStatic){
 904                                 return NoEnclosingInstanceInStaticContext;
 905                         }
 906                         return EmulationPathToImplicitThis; // implicit this is good enough
 907                 }
 908                 if (!sourceType.isNestedType() || sourceType.isStatic()) { // no emulation from within non-inner types
 909                         if (currentMethodScope.isConstructorCall) {
 910                                 return NoEnclosingInstanceInConstructorCall;
 911                         }
 912                                 if (currentMethodScope.isStatic){
 913                                         return NoEnclosingInstanceInStaticContext;
 914                                 }
 915                         return null;
 916                 }
 917                 boolean insideConstructor = currentMethodScope.isInsideInitializerOrConstructor();
 918                 // use synthetic constructor arguments if possible
 919                 if (insideConstructor) {
 920                         SyntheticArgumentBinding syntheticArg;
 921                         if ((syntheticArg = ((NestedTypeBinding) sourceType).getSyntheticArgument(targetEnclosingType, onlyExactMatch)) != null) {
 922                                 return new Object[] { syntheticArg };
 923                         }
 924                 }
 925
 926                 // use a direct synthetic field then
 927                 if (currentMethodScope.isStatic) {
 928                         return NoEnclosingInstanceInStaticContext;
 929                 }
 930                 FieldBinding syntheticField = sourceType.getSyntheticField(targetEnclosingType, onlyExactMatch);
 931                 if (syntheticField != null) {
 932                         if (currentMethodScope.isConstructorCall){
 933                                 return NoEnclosingInstanceInConstructorCall;
 934                         }
 935                         return new Object[] { syntheticField };
 936                 }
 937                 // could be reached through a sequence of enclosing instance link (nested members)
 938                 Object[] path = new Object[2]; // probably at least 2 of them
 939                 ReferenceBinding currentType = sourceType.enclosingType();
 940                 if (insideConstructor) {
 941                         path[0] = ((NestedTypeBinding) sourceType).getSyntheticArgument((SourceTypeBinding) currentType, onlyExactMatch);
 942                 } else {
 943                         if (currentMethodScope.isConstructorCall){
 944                                 return NoEnclosingInstanceInConstructorCall;
 945                         }
 946                         path[0] = sourceType.getSyntheticField((SourceTypeBinding) currentType, onlyExactMatch);
 947                 }
 948                 if (path[0] != null) { // keep accumulating
 949
 950                         int count = 1;
 951                         ReferenceBinding currentEnclosingType;
 952                         while ((currentEnclosingType = currentType.enclosingType()) != null) {
 953
 954                                 //done?
 955                                 if (currentType == targetEnclosingType
 956                                         || (!onlyExactMatch && targetEnclosingType.isSuperclassOf(currentType)))        break;
 957
 958                                 if (currentMethodScope != null) {
 959                                         currentMethodScope = currentMethodScope.enclosingMethodScope();
 960                                         if (currentMethodScope != null && currentMethodScope.isConstructorCall){
 961                                                 return NoEnclosingInstanceInConstructorCall;
 962                                         }
 963                                         if (currentMethodScope != null && currentMethodScope.isStatic){
 964                                                 return NoEnclosingInstanceInStaticContext;
 965                                         }
 966                                 }
 967
 968                                 syntheticField = ((NestedTypeBinding) currentType).getSyntheticField((SourceTypeBinding) currentEnclosingType, onlyExactMatch);
 969                                 if (syntheticField == null) break;
 970
 971                                 // append inside the path
 972                                 if (count == path.length) {
 973                                         System.arraycopy(path, 0, (path = new Object[count + 1]), 0, count);
 974                                 }
 975                                 // private access emulation is necessary since synthetic field is private
 976                                 path[count++] = ((SourceTypeBinding) syntheticField.declaringClass).addSyntheticMethod(syntheticField, true);
 977                                 currentType = currentEnclosingType;
 978                         }
 979                         if (currentType == targetEnclosingType
 980                                 || (!onlyExactMatch && targetEnclosingType.isSuperclassOf(currentType))) {
 981                                 return path;
 982                         }
 983                 }
 984                 return null;
 985         }
 986
 987         /* API
 988      *
 989          *      Answer the field binding that corresponds to fieldName.
 990          *      Start the lookup at the receiverType.
 991          *      InvocationSite implements
 992          *              isSuperAccess(); this is used to determine if the discovered field is visible.
 993          *      Only fields defined by the receiverType or its supertypes are answered;
 994          *      a field of an enclosing type will not be found using this API.
 995          *
 996          *      If no visible field is discovered, an error binding is answered.
 997          */
 998         public FieldBinding getField(
 999                 TypeBinding receiverType,
1000                 char[] fieldName,
1001                 InvocationSite invocationSite) {
1002
1003                 FieldBinding field = findField(receiverType, fieldName, invocationSite);
1004                 if (field == null)
1005                         return new ProblemFieldBinding(
1006                                 receiverType instanceof ReferenceBinding
1007                                         ? (ReferenceBinding) receiverType
1008                                         : null,
1009                                 fieldName,
1010                                 NotFound);
1011                 else
1012                         return field;
1013         }
1014
1015         /* API
1016      *
1017          *      Answer the method binding that corresponds to selector, argumentTypes.
1018          *      Start the lookup at the enclosing type of the receiver.
1019          *      InvocationSite implements
1020          *              isSuperAccess(); this is used to determine if the discovered method is visible.
1021          *              setDepth(int); this is used to record the depth of the discovered method
1022          *                      relative to the enclosing type of the receiver. (If the method is defined
1023          *                      in the enclosing type of the receiver, the depth is 0; in the next enclosing
1024          *                      type, the depth is 1; and so on
1025          *
1026          *      If no visible method is discovered, an error binding is answered.
1027          */
1028         public MethodBinding getImplicitMethod(
1029                 char[] selector,
1030                 TypeBinding[] argumentTypes,
1031                 InvocationSite invocationSite) {
1032
1033                 boolean insideStaticContext = false;
1034                 boolean insideConstructorCall = false;
1035                 MethodBinding foundMethod = null;
1036                 ProblemMethodBinding foundFuzzyProblem = null;
1037                 // the weird method lookup case (matches method name in scope, then arg types, then visibility)
1038                 ProblemMethodBinding foundInsideProblem = null;
1039                 // inside Constructor call or inside static context
1040                 Scope scope = this;
1041                 int depth = 0;
1042                 done : while (true) { // done when a COMPILATION_UNIT_SCOPE is found
1043                         switch (scope.kind) {
1044                                 case METHOD_SCOPE :
1045                                         MethodScope methodScope = (MethodScope) scope;
1046                                         insideStaticContext |= methodScope.isStatic;
1047                                         insideConstructorCall |= methodScope.isConstructorCall;
1048                                         break;
1049                                 case CLASS_SCOPE :
1050                                         ClassScope classScope = (ClassScope) scope;
1051                                         SourceTypeBinding receiverType = classScope.referenceContext.binding;
1052                                         boolean isExactMatch = true;
1053                                         // retrieve an exact visible match (if possible)
1054                                         MethodBinding methodBinding =
1055                                                 (foundMethod == null)
1056                                                         ? classScope.findExactMethod(
1057                                                                 receiverType,
1058                                                                 selector,
1059                                                                 argumentTypes,
1060                                                                 invocationSite)
1061                                                         : classScope.findExactMethod(
1062                                                                 receiverType,
1063                                                                 foundMethod.selector,
1064                                                                 foundMethod.parameters,
1065                                                                 invocationSite);
1066                                         //                                              ? findExactMethod(receiverType, selector, argumentTypes, invocationSite)
1067                                         //                                              : findExactMethod(receiverType, foundMethod.selector, foundMethod.parameters, invocationSite);
1068                                         if (methodBinding == null) {
1069                                                 // answers closest approximation, may not check argumentTypes or visibility
1070                                                 isExactMatch = false;
1071                                                 methodBinding =
1072                                                         classScope.findMethod(receiverType, selector, argumentTypes, invocationSite);
1073                                                 //                                      methodBinding = findMethod(receiverType, selector, argumentTypes, invocationSite);
1074                                         }
1075                                         if (methodBinding != null) { // skip it if we did not find anything
1076                                                 if (methodBinding.problemId() == Ambiguous) {
1077                                                         if (foundMethod == null || foundMethod.problemId() == NotVisible)
1078                                                                 // supercedes any potential InheritedNameHidesEnclosingName problem
1079                                                                 return methodBinding;
1080                                                         else
1081                                                                 // make the user qualify the method, likely wants the first inherited method (javac generates an ambiguous error instead)
1082                                                                 return new ProblemMethodBinding(
1083                                                                         selector,
1084                                                                         argumentTypes,
1085                                                                         InheritedNameHidesEnclosingName);
1086                                                 }
1087
1088                                                 ProblemMethodBinding fuzzyProblem = null;
1089                                                 ProblemMethodBinding insideProblem = null;
1090                                                 if (methodBinding.isValidBinding()) {
1091                                                         if (!isExactMatch) {
1092                                                                 if (!areParametersAssignable(methodBinding.parameters, argumentTypes)) {
1093                                                                         if (foundMethod == null || foundMethod.problemId() == NotVisible){
1094                                                                                 // inherited mismatch is reported directly, not looking at enclosing matches
1095                                                                                 return new ProblemMethodBinding(methodBinding, selector, argumentTypes, NotFound);
1096                                                                         }
1097                                                                         // make the user qualify the method, likely wants the first inherited method (javac generates an ambiguous error instead)
1098                                                                         fuzzyProblem = new ProblemMethodBinding(selector, methodBinding.parameters, InheritedNameHidesEnclosingName);
1099
1100                                                                 } else if (!methodBinding.canBeSeenBy(receiverType, invocationSite, classScope)) {
1101                                                                         // using <classScope> instead of <this> for visibility check does grant all access to innerclass
1102                                                                         fuzzyProblem =
1103                                                                                 new ProblemMethodBinding(
1104                                                                                         methodBinding,
1105                                                                                         selector,
1106                                                                                         methodBinding.parameters,
1107                                                                                         NotVisible);
1108                                                                 }
1109                                                         }
1110                                                         if (fuzzyProblem == null && !methodBinding.isStatic()) {
1111                                                                 if (insideConstructorCall) {
1112                                                                         insideProblem =
1113                                                                                 new ProblemMethodBinding(
1114                                                                                         methodBinding.selector,
1115                                                                                         methodBinding.parameters,
1116                                                                                         NonStaticReferenceInConstructorInvocation);
1117                                                                 } else if (insideStaticContext) {
1118                                                                         insideProblem =
1119                                                                                 new ProblemMethodBinding(
1120                                                                                         methodBinding.selector,
1121                                                                                         methodBinding.parameters,
1122                                                                                         NonStaticReferenceInStaticContext);
1123                                                                 }
1124                                                         }
1125
1126 //                                                      if (receiverType == methodBinding.declaringClass
1127 //                                                              || (receiverType.getMethods(selector)) != NoMethods
1128 //                                                              || ((fuzzyProblem == null || fuzzyProblem.problemId() != NotVisible) && environment().options.complianceLevel >= CompilerOptions.JDK1_4)){
1129 //                                                              // found a valid method in the 'immediate' scope (ie. not inherited)
1130 //                                                              // OR the receiverType implemented a method with the correct name
1131 //                                                              // OR in 1.4 mode (inherited visible shadows enclosing)
1132 //                                                              if (foundMethod == null) {
1133 //                                                                      if (depth > 0){
1134 //                                                                              invocationSite.setDepth(depth);
1135 //                                                                              invocationSite.setActualReceiverType(receiverType);
1136 //                                                                      }
1137 //                                                                      // return the methodBinding if it is not declared in a superclass of the scope's binding (that is, inherited)
1138 //                                                                      if (fuzzyProblem != null)
1139 //                                                                              return fuzzyProblem;
1140 //                                                                      if (insideProblem != null)
1141 //                                                                              return insideProblem;
1142 //                                                                      return methodBinding;
1143 //                                                              }
1144 //                                                              // if a method was found, complain when another is found in an 'immediate' enclosing type (that is, not inherited)
1145 //                                                              // NOTE: Unlike fields, a non visible method hides a visible method
1146 //                                                              if (foundMethod.declaringClass != methodBinding.declaringClass)
1147 //                                                                      // ie. have we found the same method - do not trust field identity yet
1148 //                                                                      return new ProblemMethodBinding(
1149 //                                                                              methodBinding.selector,
1150 //                                                                              methodBinding.parameters,
1151 //                                                                              InheritedNameHidesEnclosingName);
1152 //                                                      }
1153                                                 }
1154
1155                                                 if (foundMethod == null
1156                                                         || (foundMethod.problemId() == NotVisible
1157                                                                 && methodBinding.problemId() != NotVisible)) {
1158                                                         // only remember the methodBinding if its the first one found or the previous one was not visible & methodBinding is...
1159                                                         // remember that private methods are visible if defined directly by an enclosing class
1160                                                         if (depth > 0){
1161                                                                 invocationSite.setDepth(depth);
1162                                                                 invocationSite.setActualReceiverType(receiverType);
1163                                                         }
1164                                                         foundFuzzyProblem = fuzzyProblem;
1165                                                         foundInsideProblem = insideProblem;
1166                                                         if (fuzzyProblem == null)
1167                                                                 foundMethod = methodBinding; // only keep it if no error was found
1168                                                 }
1169                                         }
1170                                         depth++;
1171                                         insideStaticContext |= receiverType.isStatic();
1172                                         // 1EX5I8Z - accessing outer fields within a constructor call is permitted
1173                                         // in order to do so, we change the flag as we exit from the type, not the method
1174                                         // itself, because the class scope is used to retrieve the fields.
1175                                         MethodScope enclosingMethodScope = scope.methodScope();
1176                                         insideConstructorCall =
1177                                                 enclosingMethodScope == null ? false : enclosingMethodScope.isConstructorCall;
1178                                         break;
1179                                 case COMPILATION_UNIT_SCOPE :
1180                                         break done;
1181                         }
1182                         scope = scope.parent;
1183                 }
1184
1185                 if (foundFuzzyProblem != null)
1186                         return foundFuzzyProblem;
1187                 if (foundInsideProblem != null)
1188                         return foundInsideProblem;
1189                 if (foundMethod != null)
1190                         return foundMethod;
1191                 return new ProblemMethodBinding(selector, argumentTypes, NotFound);
1192         }
1193
1194         /* API
1195      *
1196          *      Answer the method binding that corresponds to selector, argumentTypes.
1197          *      Start the lookup at the receiverType.
1198          *      InvocationSite implements
1199          *              isSuperAccess(); this is used to determine if the discovered method is visible.
1200          *
1201          *      Only methods defined by the receiverType or its supertypes are answered;
1202          *      use getImplicitMethod() to discover methods of enclosing types.
1203          *
1204          *      If no visible method is discovered, an error binding is answered.
1205          */
1206         public MethodBinding getMethod(
1207                 TypeBinding receiverType,
1208                 char[] selector,
1209                 TypeBinding[] argumentTypes,
1210                 InvocationSite invocationSite) {
1211
1212                 if (receiverType.isArrayType())
1213                         return findMethodForArray(
1214                                 (ArrayBinding) receiverType,
1215                                 selector,
1216                                 argumentTypes,
1217                                 invocationSite);
1218                 if (receiverType.isBaseType())
1219                         return new ProblemMethodBinding(selector, argumentTypes, NotFound);
1220
1221                 ReferenceBinding currentType = (ReferenceBinding) receiverType;
1222                 if (!currentType.canBeSeenBy(this))
1223                         return new ProblemMethodBinding(selector, argumentTypes, ReceiverTypeNotVisible);
1224
1225                 // retrieve an exact visible match (if possible)
1226                 MethodBinding methodBinding =
1227                         findExactMethod(currentType, selector, argumentTypes, invocationSite);
1228                 if (methodBinding != null)
1229                         return methodBinding;
1230
1231                 // answers closest approximation, may not check argumentTypes or visibility
1232                 methodBinding =
1233                         findMethod(currentType, selector, argumentTypes, invocationSite);
1234                 if (methodBinding == null)
1235                         return new ProblemMethodBinding(selector, argumentTypes, NotFound);
1236                 if (methodBinding.isValidBinding()) {
1237                         if (!areParametersAssignable(methodBinding.parameters, argumentTypes))
1238                                 return new ProblemMethodBinding(
1239                                         methodBinding,
1240                                         selector,
1241                                         argumentTypes,
1242                                         NotFound);
1243                         if (!methodBinding.canBeSeenBy(currentType, invocationSite, this))
1244                                 return new ProblemMethodBinding(
1245                                         methodBinding,
1246                                         selector,
1247                                         methodBinding.parameters,
1248                                         NotVisible);
1249                 }
1250                 return methodBinding;
1251         }
1252
1253         public int maxShiftedOffset() {
1254                 int max = -1;
1255                 if (this.shiftScopes != null){
1256                         for (int i = 0, length = this.shiftScopes.length; i < length; i++){
1257                                 int subMaxOffset = this.shiftScopes[i].maxOffset;
1258                                 if (subMaxOffset > max) max = subMaxOffset;
1259                         }
1260                 }
1261                 return max;
1262         }
1263
1264         /* Answer the problem reporter to use for raising new problems.
1265          *
1266          * Note that as a side-effect, this updates the current reference context
1267          * (unit, type or method) in case the problem handler decides it is necessary
1268          * to abort.
1269          */
1270         public ProblemReporter problemReporter() {
1271
1272                 return outerMostMethodScope().problemReporter();
1273         }
1274
1275         /*
1276          * Code responsible to request some more emulation work inside the invocation type, so as to supply
1277          * correct synthetic arguments to any allocation of the target type.
1278          */
1279         public void propagateInnerEmulation(ReferenceBinding targetType, boolean isEnclosingInstanceSupplied) {
1280
1281                 // no need to propagate enclosing instances, they got eagerly allocated already.
1282
1283                 SyntheticArgumentBinding[] syntheticArguments;
1284                 if ((syntheticArguments = targetType.syntheticOuterLocalVariables()) != null) {
1285                         for (int i = 0, max = syntheticArguments.length; i < max; i++) {
1286                                 SyntheticArgumentBinding syntheticArg = syntheticArguments[i];
1287                                 // need to filter out the one that could match a supplied enclosing instance
1288                                 if (!(isEnclosingInstanceSupplied
1289                                         && (syntheticArg.type == targetType.enclosingType()))) {
1290                                         this.emulateOuterAccess(syntheticArg.actualOuterLocalVariable);
1291                                 }
1292                         }
1293                 }
1294         }
1295
1296         /* Answer the reference type of this scope.
1297          *
1298          * It is the nearest enclosing type of this scope.
1299          */
1300         public TypeDeclaration referenceType() {
1301
1302                 return methodScope().referenceType();
1303         }
1304
1305         // start position in this scope - for ordering scopes vs. variables
1306         int startIndex() {
1307                 return startIndex;
1308         }
1309
1310         public String toString() {
1311                 return toString(0);
1312         }
1313
1314         public String toString(int tab) {
1315
1316                 String s = basicToString(tab);
1317                 for (int i = 0; i < scopeIndex; i++)
1318                         if (subscopes[i] instanceof BlockScope)
1319                                 s += ((BlockScope) subscopes[i]).toString(tab + 1) + "\n"; //$NON-NLS-1$
1320                 return s;
1321         }
1322 }