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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpeclipse.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  16 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.FieldBinding;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.LocalVariableBinding;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.MethodScope;
  21 import net.sourceforge.phpdt.internal.compiler.lookup.ProblemFieldBinding;
  22 import net.sourceforge.phpdt.internal.compiler.lookup.ProblemReferenceBinding;
  23 import net.sourceforge.phpdt.internal.compiler.lookup.SourceTypeBinding;
  24 import net.sourceforge.phpdt.internal.compiler.lookup.SyntheticAccessMethodBinding;
  25 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  26 import net.sourceforge.phpdt.internal.compiler.lookup.VariableBinding;
  27
  28
  29 public class QualifiedNameReference extends NameReference {
  30
  31         public char[][] tokens;
  32         public FieldBinding[] otherBindings, otherCodegenBindings;
  33         int[] otherDepths;
  34         public int indexOfFirstFieldBinding;//points (into tokens) for the first token that corresponds to first FieldBinding
  35         SyntheticAccessMethodBinding syntheticWriteAccessor;
  36         SyntheticAccessMethodBinding[] syntheticReadAccessors;
  37         protected FieldBinding lastFieldBinding;
  38         public QualifiedNameReference(
  39                 char[][] sources,
  40                 int sourceStart,
  41                 int sourceEnd) {
  42                 super();
  43                 tokens = sources;
  44                 this.sourceStart = sourceStart;
  45                 this.sourceEnd = sourceEnd;
  46         }
  47         public FlowInfo analyseAssignment(
  48                 BlockScope currentScope,
  49                 FlowContext flowContext,
  50                 FlowInfo flowInfo,
  51                 Assignment assignment,
  52                 boolean isCompound) {
  53
  54                 // determine the rank until which we now we do not need any actual value for the field access
  55                 int otherBindingsCount = otherBindings == null ? 0 : otherBindings.length;
  56                 boolean needValue = otherBindingsCount == 0 || !this.otherBindings[0].isStatic();
  57                 switch (bits & RestrictiveFlagMASK) {
  58                         case FIELD : // reading a field
  59                                 lastFieldBinding = (FieldBinding) binding;
  60                                 if (needValue) {
  61                                         manageSyntheticReadAccessIfNecessary(currentScope, lastFieldBinding, this.actualReceiverType, 0);
  62                                 }                               // check if final blank field
  63                                 if (lastFieldBinding.isBlankFinal()
  64                                     && this.otherBindings != null // the last field binding is only assigned
  65                                         && currentScope.allowBlankFinalFieldAssignment(lastFieldBinding)) {
  66                                         if (!flowInfo.isDefinitelyAssigned(lastFieldBinding)) {
  67                                                 currentScope.problemReporter().uninitializedBlankFinalField(
  68                                                         lastFieldBinding,
  69                                                         this);
  70                                         }
  71                                 }
  72                                 break;
  73 //                      case LOCAL :
  74 //                              // first binding is a local variable
  75 //                              LocalVariableBinding localBinding;
  76 //                              if (!flowInfo
  77 //                                      .isDefinitelyAssigned(localBinding = (LocalVariableBinding) binding)) {
  78 //                                      currentScope.problemReporter().uninitializedLocalVariable(localBinding, this);
  79 //                              }
  80 //                              if (flowInfo.isReachable()) {
  81 //                                      localBinding.useFlag = LocalVariableBinding.USED;
  82 //                              } else if (localBinding.useFlag == LocalVariableBinding.UNUSED) {
  83 //                                      localBinding.useFlag = LocalVariableBinding.FAKE_USED;
  84 //                              }
  85                 }
  86
  87                 if (needValue) {
  88                         manageEnclosingInstanceAccessIfNecessary(currentScope);
  89                         // only for first binding
  90                 }
  91                 // all intermediate field accesses are read accesses
  92                 if (otherBindings != null) {
  93                         for (int i = 0; i < otherBindingsCount-1; i++) {
  94                                 lastFieldBinding = otherBindings[i];
  95                                 needValue = !otherBindings[i+1].isStatic();
  96                                 if (needValue) {
  97                                         manageSyntheticReadAccessIfNecessary(
  98                                                 currentScope,
  99                                                 lastFieldBinding,
 100                                                 i == 0
 101                                                         ? ((VariableBinding)binding).type
 102                                                         : otherBindings[i-1].type,
 103                                                 i + 1);
 104                                 }
 105                         }
 106                         lastFieldBinding = otherBindings[otherBindingsCount-1];
 107                 }
 108
 109                 if (isCompound) {
 110                         if (binding == lastFieldBinding
 111                                 && lastFieldBinding.isBlankFinal()
 112                                 && currentScope.allowBlankFinalFieldAssignment(lastFieldBinding)
 113                                 && (!flowInfo.isDefinitelyAssigned(lastFieldBinding))) {
 114                                 currentScope.problemReporter().uninitializedBlankFinalField(
 115                                         lastFieldBinding,
 116                                         this);
 117                         }
 118                         TypeBinding lastReceiverType;
 119                         if (lastFieldBinding == binding){
 120                                 lastReceiverType = this.actualReceiverType;
 121                         } else if (otherBindingsCount == 1){
 122                                 lastReceiverType = ((VariableBinding)this.binding).type;
 123                         } else {
 124                                 lastReceiverType = this.otherBindings[otherBindingsCount-2].type;
 125                         }
 126                         manageSyntheticReadAccessIfNecessary(
 127                                 currentScope,
 128                                 lastFieldBinding,
 129                                 lastReceiverType,
 130                                 lastFieldBinding == binding
 131                                         ? 0
 132                                         : otherBindingsCount);
 133                 }
 134
 135                 if (assignment.expression != null) {
 136                         flowInfo =
 137                                 assignment
 138                                         .expression
 139                                         .analyseCode(currentScope, flowContext, flowInfo)
 140                                         .unconditionalInits();
 141                 }
 142
 143                 // the last field access is a write access
 144                 if (lastFieldBinding.isFinal()) {
 145                         // in a context where it can be assigned?
 146                         if (lastFieldBinding.isBlankFinal()
 147                                         && !isCompound
 148                                         && currentScope.allowBlankFinalFieldAssignment(lastFieldBinding)
 149                                         && indexOfFirstFieldBinding == 1) {
 150                                 if (flowInfo.isPotentiallyAssigned(lastFieldBinding)) {
 151                                         currentScope.problemReporter().duplicateInitializationOfBlankFinalField(lastFieldBinding, this);
 152                                 } else {
 153                                         flowContext.recordSettingFinal(lastFieldBinding, this);
 154                                 }
 155                                 flowInfo.markAsDefinitelyAssigned(lastFieldBinding);
 156                         } else {
 157                                 currentScope.problemReporter().cannotAssignToFinalField(lastFieldBinding, this);
 158                                 if (currentScope.allowBlankFinalFieldAssignment(lastFieldBinding)) { // pretend it got assigned
 159                                         flowInfo.markAsDefinitelyAssigned(lastFieldBinding);
 160                                 }
 161                         }
 162                 }
 163                 // equivalent to valuesRequired[maxOtherBindings]
 164                 TypeBinding lastReceiverType;
 165                 if (lastFieldBinding == binding){
 166                         lastReceiverType = this.actualReceiverType;
 167                 } else if (otherBindingsCount == 1){
 168                         lastReceiverType = ((VariableBinding)this.binding).type;
 169                 } else {
 170                         lastReceiverType = this.otherBindings[otherBindingsCount-2].type;
 171                 }
 172                 manageSyntheticWriteAccessIfNecessary(currentScope, lastFieldBinding, lastReceiverType);
 173
 174                 return flowInfo;
 175         }
 176
 177         public FlowInfo analyseCode(
 178                 BlockScope currentScope,
 179                 FlowContext flowContext,
 180                 FlowInfo flowInfo) {
 181
 182                 return analyseCode(currentScope, flowContext, flowInfo, true);
 183         }
 184
 185         public FlowInfo analyseCode(
 186                 BlockScope currentScope,
 187                 FlowContext flowContext,
 188                 FlowInfo flowInfo,
 189                 boolean valueRequired) {
 190
 191                 // determine the rank until which we now we do not need any actual value for the field access
 192                 int otherBindingsCount = otherBindings == null ? 0 : otherBindings.length;
 193
 194                 boolean needValue = otherBindingsCount == 0 ? valueRequired : !this.otherBindings[0].isStatic();
 195                 switch (bits & RestrictiveFlagMASK) {
 196                         case FIELD : // reading a field
 197                                 if (needValue) {
 198                                         manageSyntheticReadAccessIfNecessary(currentScope, (FieldBinding) binding, this.actualReceiverType, 0);
 199                                 }
 200                                 // check if reading a final blank field
 201                                 FieldBinding fieldBinding;
 202                                         if ((fieldBinding = (FieldBinding) binding).isBlankFinal()
 203                                                 && (indexOfFirstFieldBinding == 1)
 204                                         // was an implicit reference to the first field binding
 205                                                 && currentScope.allowBlankFinalFieldAssignment(fieldBinding)
 206                                                 && (!flowInfo.isDefinitelyAssigned(fieldBinding))) {
 207                                         currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
 208                                 }
 209                                 break;
 210 //                      case LOCAL : // reading a local variable
 211 //                              LocalVariableBinding localBinding;
 212 //                              if (!flowInfo
 213 //                                      .isDefinitelyAssigned(localBinding = (LocalVariableBinding) binding)) {
 214 //                                      currentScope.problemReporter().uninitializedLocalVariable(localBinding, this);
 215 //                              }
 216 //                              if (flowInfo.isReachable()) {
 217 //                                      localBinding.useFlag = LocalVariableBinding.USED;
 218 //                              } else if (localBinding.useFlag == LocalVariableBinding.UNUSED) {
 219 //                                      localBinding.useFlag = LocalVariableBinding.FAKE_USED;
 220 //                              }
 221                 }
 222                 if (needValue) {
 223                         manageEnclosingInstanceAccessIfNecessary(currentScope);
 224                         // only for first binding
 225                 }
 226                 if (otherBindings != null) {
 227                         for (int i = 0; i < otherBindingsCount; i++) {
 228                                 needValue = i < otherBindingsCount-1 ? !otherBindings[i+1].isStatic() : valueRequired;
 229                                 if (needValue) {
 230                                         manageSyntheticReadAccessIfNecessary(
 231                                                 currentScope,
 232                                                 otherBindings[i],
 233                                                 i == 0
 234                                                         ? ((VariableBinding)binding).type
 235                                                         : otherBindings[i-1].type,
 236                                                 i + 1);
 237                                 }
 238                         }
 239                 }
 240                 return flowInfo;
 241         }
 242         /**
 243          * Check and/or redirect the field access to the delegate receiver if any
 244          */
 245         public TypeBinding checkFieldAccess(BlockScope scope) {
 246                 // check for forward references
 247                 FieldBinding fieldBinding = (FieldBinding) binding;
 248                 MethodScope methodScope = scope.methodScope();
 249                 if (methodScope.enclosingSourceType() == fieldBinding.declaringClass
 250                         && methodScope.fieldDeclarationIndex != MethodScope.NotInFieldDecl
 251                         && fieldBinding.id >= methodScope.fieldDeclarationIndex) {
 252                         if ((!fieldBinding.isStatic() || methodScope.isStatic)
 253                                 && this.indexOfFirstFieldBinding == 1)
 254                                 scope.problemReporter().forwardReference(this, 0, scope.enclosingSourceType());
 255                 }
 256                 bits &= ~RestrictiveFlagMASK; // clear bits
 257                 bits |= FIELD;
 258                 return getOtherFieldBindings(scope);
 259         }
 260 //      public void generateAssignment(
 261 //              BlockScope currentScope,
 262 //              CodeStream codeStream,
 263 //              Assignment assignment,
 264 //              boolean valueRequired) {
 265 //
 266 //              generateReadSequence(currentScope, codeStream);
 267 //              assignment.expression.generateCode(currentScope, codeStream, true);
 268 //              fieldStore(codeStream, lastFieldBinding, syntheticWriteAccessor, valueRequired);
 269 //              // equivalent to valuesRequired[maxOtherBindings]
 270 //              if (valueRequired) {
 271 //                      codeStream.generateImplicitConversion(assignment.implicitConversion);
 272 //              }
 273 //      }
 274 //      public void generateCode(
 275 //              BlockScope currentScope,
 276 //              CodeStream codeStream,
 277 //              boolean valueRequired) {
 278 //
 279 //              int pc = codeStream.position;
 280 //              if (constant != NotAConstant) {
 281 //                      if (valueRequired) {
 282 //                              codeStream.generateConstant(constant, implicitConversion);
 283 //                      }
 284 //              } else {
 285 //                      generateReadSequence(currentScope, codeStream);
 286 //                      if (valueRequired) {
 287 //                              if (lastFieldBinding.declaringClass == null) { // array length
 288 //                                      codeStream.arraylength();
 289 //                                      codeStream.generateImplicitConversion(implicitConversion);
 290 //                              } else {
 291 //                                      if (lastFieldBinding.constant != NotAConstant) {
 292 //                                              if (!lastFieldBinding.isStatic()){
 293 //                                                      codeStream.invokeObjectGetClass();
 294 //                                                      codeStream.pop();
 295 //                                              }
 296 //                                              // inline the last field constant
 297 //                                              codeStream.generateConstant(lastFieldBinding.constant, implicitConversion);
 298 //                                      } else {
 299 //                                              SyntheticAccessMethodBinding accessor =
 300 //                                                      syntheticReadAccessors == null
 301 //                                                              ? null
 302 //                                                              : syntheticReadAccessors[syntheticReadAccessors.length - 1];
 303 //                                              if (accessor == null) {
 304 //                                                      if (lastFieldBinding.isStatic()) {
 305 //                                                              codeStream.getstatic(lastFieldBinding);
 306 //                                                      } else {
 307 //                                                              codeStream.getfield(lastFieldBinding);
 308 //                                                      }
 309 //                                              } else {
 310 //                                                      codeStream.invokestatic(accessor);
 311 //                                              }
 312 //                                              codeStream.generateImplicitConversion(implicitConversion);
 313 //                                      }
 314 //                              }
 315 //                      } else {
 316 //                              if (lastFieldBinding != null && !lastFieldBinding.isStatic()){
 317 //                                      codeStream.invokeObjectGetClass(); // perform null check
 318 //                                      codeStream.pop();
 319 //                              }
 320 //
 321 //                      }
 322 //              }
 323 //              codeStream.recordPositionsFrom(pc, this.sourceStart);
 324 //      }
 325 //      public void generateCompoundAssignment(
 326 //              BlockScope currentScope,
 327 //              CodeStream codeStream,
 328 //              Expression expression,
 329 //              int operator,
 330 //              int assignmentImplicitConversion,
 331 //              boolean valueRequired) {
 332 //
 333 //              generateReadSequence(currentScope, codeStream);
 334 //              SyntheticAccessMethodBinding accessor =
 335 //                      syntheticReadAccessors == null
 336 //                              ? null
 337 //                              : syntheticReadAccessors[syntheticReadAccessors.length - 1];
 338 //              if (lastFieldBinding.isStatic()) {
 339 //                      if (accessor == null) {
 340 //                              codeStream.getstatic(lastFieldBinding);
 341 //                      } else {
 342 //                              codeStream.invokestatic(accessor);
 343 //                      }
 344 //              } else {
 345 //                      codeStream.dup();
 346 //                      if (accessor == null) {
 347 //                              codeStream.getfield(lastFieldBinding);
 348 //                      } else {
 349 //                              codeStream.invokestatic(accessor);
 350 //                      }
 351 //              }
 352 //              // the last field access is a write access
 353 //              // perform the actual compound operation
 354 //              int operationTypeID;
 355 //              if ((operationTypeID = implicitConversion >> 4) == T_String) {
 356 //                      codeStream.generateStringAppend(currentScope, null, expression);
 357 //              } else {
 358 //                      // promote the array reference to the suitable operation type
 359 //                      codeStream.generateImplicitConversion(implicitConversion);
 360 //                      // generate the increment value (will by itself  be promoted to the operation value)
 361 //                      if (expression == IntLiteral.One) { // prefix operation
 362 //                              codeStream.generateConstant(expression.constant, implicitConversion);
 363 //                      } else {
 364 //                              expression.generateCode(currentScope, codeStream, true);
 365 //                      }
 366 //                      // perform the operation
 367 //                      codeStream.sendOperator(operator, operationTypeID);
 368 //                      // cast the value back to the array reference type
 369 //                      codeStream.generateImplicitConversion(assignmentImplicitConversion);
 370 //              }
 371 //              // actual assignment
 372 //              fieldStore(codeStream, lastFieldBinding, syntheticWriteAccessor, valueRequired);
 373 //              // equivalent to valuesRequired[maxOtherBindings]
 374 //      }
 375 //      public void generatePostIncrement(
 376 //              BlockScope currentScope,
 377 //              CodeStream codeStream,
 378 //              CompoundAssignment postIncrement,
 379 //              boolean valueRequired) {
 380 //              generateReadSequence(currentScope, codeStream);
 381 //              SyntheticAccessMethodBinding accessor =
 382 //                      syntheticReadAccessors == null
 383 //                              ? null
 384 //                              : syntheticReadAccessors[syntheticReadAccessors.length - 1];
 385 //              if (lastFieldBinding.isStatic()) {
 386 //                      if (accessor == null) {
 387 //                              codeStream.getstatic(lastFieldBinding);
 388 //                      } else {
 389 //                              codeStream.invokestatic(accessor);
 390 //                      }
 391 //              } else {
 392 //                      codeStream.dup();
 393 //                      if (accessor == null) {
 394 //                              codeStream.getfield(lastFieldBinding);
 395 //                      } else {
 396 //                              codeStream.invokestatic(accessor);
 397 //                      }
 398 //              }
 399 //              // duplicate the old field value
 400 //              if (valueRequired) {
 401 //                      if (lastFieldBinding.isStatic()) {
 402 //                              if ((lastFieldBinding.type == LongBinding)
 403 //                                      || (lastFieldBinding.type == DoubleBinding)) {
 404 //                                      codeStream.dup2();
 405 //                              } else {
 406 //                                      codeStream.dup();
 407 //                              }
 408 //                      } else { // Stack:  [owner][old field value]  ---> [old field value][owner][old field value]
 409 //                              if ((lastFieldBinding.type == LongBinding)
 410 //                                      || (lastFieldBinding.type == DoubleBinding)) {
 411 //                                      codeStream.dup2_x1();
 412 //                              } else {
 413 //                                      codeStream.dup_x1();
 414 //                              }
 415 //                      }
 416 //              }
 417 //              codeStream.generateConstant(
 418 //                      postIncrement.expression.constant,
 419 //                      implicitConversion);
 420 //              codeStream.sendOperator(postIncrement.operator, lastFieldBinding.type.id);
 421 //              codeStream.generateImplicitConversion(
 422 //                      postIncrement.assignmentImplicitConversion);
 423 //              fieldStore(codeStream, lastFieldBinding, syntheticWriteAccessor, false);
 424 //      }
 425 //      /*
 426 //       * Generate code for all bindings (local and fields) excluding the last one, which may then be generated code
 427 //       * for a read or write access.
 428 //       */
 429 //      public void generateReadSequence(
 430 //              BlockScope currentScope,
 431 //              CodeStream codeStream) {
 432 //
 433 //              // determine the rank until which we now we do not need any actual value for the field access
 434 //              int otherBindingsCount = this.otherCodegenBindings == null ? 0 : otherCodegenBindings.length;
 435 //
 436 //              boolean needValue = otherBindingsCount == 0 || !this.otherBindings[0].isStatic();
 437 //              switch (bits & RestrictiveFlagMASK) {
 438 //                      case FIELD :
 439 //                              lastFieldBinding = (FieldBinding) this.codegenBinding;
 440 //                              // if first field is actually constant, we can inline it
 441 //                              if (lastFieldBinding.constant != NotAConstant) {
 442 //                                      break;
 443 //                              }
 444 //                              if (needValue && !lastFieldBinding.isStatic()) {
 445 //                                      if ((bits & DepthMASK) != 0) {
 446 //                                              ReferenceBinding targetType = currentScope.enclosingSourceType().enclosingTypeAt((bits & DepthMASK) >> DepthSHIFT);
 447 //                                              Object[] emulationPath = currentScope.getEmulationPath(targetType, true /*only exact match*/, false/*consider enclosing arg*/);
 448 //                                              codeStream.generateOuterAccess(emulationPath, this, targetType, currentScope);
 449 //                                      } else {
 450 //                                              generateReceiver(codeStream);
 451 //                                      }
 452 //                              }
 453 //                              break;
 454 //                      case LOCAL : // reading the first local variable
 455 //                              if (!needValue) break; // no value needed
 456 //                              lastFieldBinding = null;
 457 //                              LocalVariableBinding localBinding = (LocalVariableBinding) this.codegenBinding;
 458 //                              // regular local variable read
 459 //                              if (localBinding.constant != NotAConstant) {
 460 //                                      codeStream.generateConstant(localBinding.constant, 0);
 461 //                                      // no implicit conversion
 462 //                              } else {
 463 //                                      // outer local?
 464 //                                      if ((bits & DepthMASK) != 0) {
 465 //                                              // outer local can be reached either through a synthetic arg or a synthetic field
 466 //                                              VariableBinding[] path = currentScope.getEmulationPath(localBinding);
 467 //                                              codeStream.generateOuterAccess(path, this, localBinding, currentScope);
 468 //                                      } else {
 469 //                                              codeStream.load(localBinding);
 470 //                                      }
 471 //                              }
 472 //              }
 473 //
 474 //              // all intermediate field accesses are read accesses
 475 //              // only the last field binding is a write access
 476 //              if (this.otherCodegenBindings != null) {
 477 //                      for (int i = 0; i < otherBindingsCount; i++) {
 478 //                              FieldBinding nextField = this.otherCodegenBindings[i];
 479 //                              if (lastFieldBinding != null) {
 480 //                                      needValue = !nextField.isStatic();
 481 //                                      if (needValue) {
 482 //                                              MethodBinding accessor =
 483 //                                                      syntheticReadAccessors == null ? null : syntheticReadAccessors[i];
 484 //                                              if (accessor == null) {
 485 //                                                      if (lastFieldBinding.constant != NotAConstant) {
 486 //                                                              if (this.lastFieldBinding != this.codegenBinding && !this.lastFieldBinding.isStatic()) {
 487 //                                                                      codeStream.invokeObjectGetClass(); // perform null check
 488 //                                                                      codeStream.pop();
 489 //                                                              }
 490 //                                                              codeStream.generateConstant(lastFieldBinding.constant, 0);
 491 //                                                      } else if (lastFieldBinding.isStatic()) {
 492 //                                                              codeStream.getstatic(lastFieldBinding);
 493 //                                                      } else {
 494 //                                                              codeStream.getfield(lastFieldBinding);
 495 //                                                      }
 496 //                                              } else {
 497 //                                                      codeStream.invokestatic(accessor);
 498 //                                              }
 499 //                                      } else {
 500 //                                              if (this.codegenBinding != this.lastFieldBinding && !this.lastFieldBinding.isStatic()){
 501 //                                                      codeStream.invokeObjectGetClass(); // perform null check
 502 //                                                      codeStream.pop();
 503 //                                              }
 504 //                                      }
 505 //                              }
 506 //                              this.lastFieldBinding = nextField;
 507 //                      }
 508 //              }
 509 //      }
 510 //      public void generateReceiver(CodeStream codeStream) {
 511 //              codeStream.aload_0();
 512 //      }
 513         public TypeBinding getOtherFieldBindings(BlockScope scope) {
 514                 // At this point restrictiveFlag may ONLY have two potential value : FIELD LOCAL (i.e cast <<(VariableBinding) binding>> is valid)
 515                 if ((bits & FIELD) != 0) {
 516                         if (!((FieldBinding) binding).isStatic()) {
 517                                 //must check for the static status....
 518                                 if (indexOfFirstFieldBinding == 1) {
 519                                         //the field is the first token of the qualified reference....
 520                                         if (scope.methodScope().isStatic) {
 521                                                 scope.problemReporter().staticFieldAccessToNonStaticVariable(
 522                                                         this,
 523                                                         (FieldBinding) binding);
 524                                                 return null;
 525                                         }
 526                                 } else { //accessing to a field using a type as "receiver" is allowed only with static field
 527                                         scope.problemReporter().staticFieldAccessToNonStaticVariable(
 528                                                 this,
 529                                                 (FieldBinding) binding);
 530                                         return null;
 531                                 }
 532                         }
 533                         if (isFieldUseDeprecated((FieldBinding) binding, scope))
 534                                 scope.problemReporter().deprecatedField((FieldBinding) binding, this);
 535                 }
 536                 TypeBinding type = ((VariableBinding) binding).type;
 537                 int index = indexOfFirstFieldBinding;
 538                 int length = tokens.length;
 539                 if (index == length) { //       restrictiveFlag == FIELD
 540                         this.constant = FieldReference.getConstantFor((FieldBinding) binding, this, false, scope);
 541                         return type;
 542                 }
 543                 // allocation of the fieldBindings array        and its respective constants
 544                 int otherBindingsLength = length - index;
 545                 otherCodegenBindings = otherBindings = new FieldBinding[otherBindingsLength];
 546                 otherDepths = new int[otherBindingsLength];
 547
 548                 // fill the first constant (the one of the binding)
 549                 this.constant =
 550                         ((bits & FIELD) != 0)
 551                                 ? FieldReference.getConstantFor((FieldBinding) binding, this, false, scope)
 552                                 : ((VariableBinding) binding).constant;
 553                 // save first depth, since will be updated by visibility checks of other bindings
 554                 int firstDepth = (bits & DepthMASK) >> DepthSHIFT;
 555                 // iteration on each field
 556                 while (index < length) {
 557                         char[] token = tokens[index];
 558                         if (type == null)
 559                                 return null; // could not resolve type prior to this point
 560
 561                         bits &= ~DepthMASK; // flush previous depth if any
 562                         FieldBinding field = scope.getField(type, token, this);
 563                         int place = index - indexOfFirstFieldBinding;
 564                         otherBindings[place] = field;
 565                         otherDepths[place] = (bits & DepthMASK) >> DepthSHIFT;
 566                         if (field.isValidBinding()) {
 567                                 if (isFieldUseDeprecated(field, scope))
 568                                         scope.problemReporter().deprecatedField(field, this);
 569                                 Constant someConstant = FieldReference.getConstantFor(field, this, false, scope);
 570                                 // constant propagation can only be performed as long as the previous one is a constant too.
 571                                 if (this.constant != NotAConstant) {
 572                                         this.constant = someConstant;
 573                                 }
 574
 575                                 type = field.type;
 576                                 index++;
 577
 578                                 if (field.isStatic()) {
 579                                         // static field accessed through receiver? legal but unoptimal (optional warning)
 580                                         scope.problemReporter().unnecessaryReceiverForStaticField(this, field);
 581                                 }
 582
 583                         } else {
 584                                 constant = NotAConstant; //don't fill other constants slots...
 585                                 scope.problemReporter().invalidField(this, field, index, type);
 586                                 setDepth(firstDepth);
 587                                 return null;
 588                         }
 589                 }
 590                 setDepth(firstDepth);
 591                 return (otherBindings[otherBindingsLength - 1]).type;
 592         }
 593         public void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope) {
 594                 //If inlinable field, forget the access emulation, the code gen will directly target it
 595                 if (((bits & DepthMASK) == 0) || (constant != NotAConstant)) {
 596                         return;
 597                 }
 598                 if ((bits & RestrictiveFlagMASK) == LOCAL) {
 599                         currentScope.emulateOuterAccess((LocalVariableBinding) binding);
 600                 }
 601         }
 602         public void manageSyntheticReadAccessIfNecessary(
 603                 BlockScope currentScope,
 604                 FieldBinding fieldBinding,
 605                 TypeBinding lastReceiverType,
 606                 int index) {
 607                 // index == 0 denotes the first fieldBinding, index > 0 denotes one of the 'otherBindings'
 608                 if (fieldBinding.constant != NotAConstant)
 609                         return;
 610                 if (fieldBinding.isPrivate()) { // private access
 611                         if (fieldBinding.declaringClass != currentScope.enclosingSourceType()) {
 612                                 if (syntheticReadAccessors == null) {
 613                                         if (otherBindings == null)
 614                                                 syntheticReadAccessors = new SyntheticAccessMethodBinding[1];
 615                                         else
 616                                                 syntheticReadAccessors =
 617                                                         new SyntheticAccessMethodBinding[otherBindings.length + 1];
 618                                 }
 619                                 syntheticReadAccessors[index] = ((SourceTypeBinding) fieldBinding.declaringClass).addSyntheticMethod(fieldBinding, true);
 620                                 currentScope.problemReporter().needToEmulateFieldReadAccess(fieldBinding, this);
 621                                 return;
 622                         }
 623                 } else if (fieldBinding.isProtected()){
 624                         int depth = index == 0 ? (bits & DepthMASK) >> DepthSHIFT : otherDepths[index-1];
 625                         // implicit protected access (only for first one)
 626                         if (depth > 0 && (fieldBinding.declaringClass.getPackage()
 627                                                                 != currentScope.enclosingSourceType().getPackage())) {
 628                                 if (syntheticReadAccessors == null) {
 629                                         if (otherBindings == null)
 630                                                 syntheticReadAccessors = new SyntheticAccessMethodBinding[1];
 631                                         else
 632                                                 syntheticReadAccessors =
 633                                                         new SyntheticAccessMethodBinding[otherBindings.length + 1];
 634                                 }
 635                                 syntheticReadAccessors[index] =
 636                                         ((SourceTypeBinding) currentScope.enclosingSourceType().enclosingTypeAt(depth))
 637                                                                                         .addSyntheticMethod(fieldBinding, true);
 638                                 currentScope.problemReporter().needToEmulateFieldReadAccess(fieldBinding, this);
 639                                 return;
 640                         }
 641                 }
 642                 // if the binding declaring class is not visible, need special action
 643                 // for runtime compatibility on 1.2 VMs : change the declaring class of the binding
 644                 // NOTE: from target 1.2 on, field's declaring class is touched if any different from receiver type
 645 //              if (fieldBinding.declaringClass != lastReceiverType
 646 //                      && !lastReceiverType.isArrayType()
 647 //                      && fieldBinding.declaringClass != null
 648 //                      && fieldBinding.constant == NotAConstant
 649 //                      && ((currentScope.environment().options.targetJDK >= CompilerOptions.JDK1_2
 650 //                                      && (index > 0 || indexOfFirstFieldBinding > 1 || !fieldBinding.isStatic())
 651 //                                      && fieldBinding.declaringClass.id != T_Object)
 652 //                              || !fieldBinding.declaringClass.canBeSeenBy(currentScope))){
 653 //                      if (index == 0){
 654 //                              this.codegenBinding = currentScope.enclosingSourceType().getUpdatedFieldBinding(fieldBinding, (ReferenceBinding)lastReceiverType);
 655 //                      } else {
 656 //                              if (this.otherCodegenBindings == this.otherBindings){
 657 //                                      int l = this.otherBindings.length;
 658 //                                      System.arraycopy(this.otherBindings, 0, this.otherCodegenBindings = new FieldBinding[l], 0, l);
 659 //                              }
 660 //                              this.otherCodegenBindings[index-1] = currentScope.enclosingSourceType().getUpdatedFieldBinding(fieldBinding, (ReferenceBinding)lastReceiverType);
 661 //                      }
 662 //              }
 663         }
 664         /*
 665          * No need to emulate access to protected fields since not implicitly accessed
 666          */
 667         public void manageSyntheticWriteAccessIfNecessary(
 668                 BlockScope currentScope,
 669                 FieldBinding fieldBinding,
 670                 TypeBinding lastReceiverType) {
 671                 if (fieldBinding.isPrivate()) {
 672                         if (fieldBinding.declaringClass != currentScope.enclosingSourceType()) {
 673                                 syntheticWriteAccessor = ((SourceTypeBinding) fieldBinding.declaringClass)
 674                                                                                         .addSyntheticMethod(fieldBinding, false);
 675                                 currentScope.problemReporter().needToEmulateFieldWriteAccess(fieldBinding, this);
 676                                 return;
 677                         }
 678                 } else if (fieldBinding.isProtected()){
 679                         int depth = fieldBinding == binding ? (bits & DepthMASK) >> DepthSHIFT : otherDepths[otherDepths.length-1];
 680                         if (depth > 0 && (fieldBinding.declaringClass.getPackage()
 681                                                                 != currentScope.enclosingSourceType().getPackage())) {
 682                                 syntheticWriteAccessor = ((SourceTypeBinding) currentScope.enclosingSourceType().enclosingTypeAt(depth))
 683                                                                                         .addSyntheticMethod(fieldBinding, false);
 684                                 currentScope.problemReporter().needToEmulateFieldWriteAccess(fieldBinding, this);
 685                                 return;
 686                         }
 687                 }
 688                 // if the binding declaring class is not visible, need special action
 689                 // for runtime compatibility on 1.2 VMs : change the declaring class of the binding
 690                 // NOTE: from target 1.2 on, field's declaring class is touched if any different from receiver type
 691 //              if (fieldBinding.declaringClass != lastReceiverType
 692 //                      && !lastReceiverType.isArrayType()
 693 //                      && fieldBinding.declaringClass != null
 694 //                      && fieldBinding.constant == NotAConstant
 695 //                      && ((currentScope.environment().options.targetJDK >= CompilerOptions.JDK1_2
 696 //                                      && (fieldBinding != binding || indexOfFirstFieldBinding > 1 || !fieldBinding.isStatic())
 697 //                                      && fieldBinding.declaringClass.id != T_Object)
 698 //                              || !fieldBinding.declaringClass.canBeSeenBy(currentScope))){
 699 //                      if (fieldBinding == binding){
 700 //                              this.codegenBinding = currentScope.enclosingSourceType().getUpdatedFieldBinding(fieldBinding, (ReferenceBinding)lastReceiverType);
 701 //                      } else {
 702 //                              if (this.otherCodegenBindings == this.otherBindings){
 703 //                                      int l = this.otherBindings.length;
 704 //                                      System.arraycopy(this.otherBindings, 0, this.otherCodegenBindings = new FieldBinding[l], 0, l);
 705 //                              }
 706 //                              this.otherCodegenBindings[this.otherCodegenBindings.length-1] = currentScope.enclosingSourceType().getUpdatedFieldBinding(fieldBinding, (ReferenceBinding)lastReceiverType);
 707 //                      }
 708 //              }
 709
 710         }
 711         /**
 712          * Normal field binding did not work, try to bind to a field of the delegate receiver.
 713          */
 714         public TypeBinding reportError(BlockScope scope) {
 715                 if (binding instanceof ProblemFieldBinding) {
 716                         scope.problemReporter().invalidField(this, (FieldBinding) binding);
 717                 } else if (binding instanceof ProblemReferenceBinding) {
 718                         scope.problemReporter().invalidType(this, (TypeBinding) binding);
 719                 } else {
 720                         scope.problemReporter().unresolvableReference(this, binding);
 721                 }
 722                 return null;
 723         }
 724         public StringBuffer printExpression(int indent, StringBuffer output) {
 725
 726                 for (int i = 0; i < tokens.length; i++) {
 727                         if (i > 0) output.append('.');
 728                         output.append(tokens[i]);
 729                 }
 730                 return output;
 731         }
 732         public TypeBinding resolveType(BlockScope scope) {
 733                 // field and/or local are done before type lookups
 734                 // the only available value for the restrictiveFlag BEFORE
 735                 // the TC is Flag_Type Flag_LocalField and Flag_TypeLocalField
 736                 this.actualReceiverType = this.receiverType = scope.enclosingSourceType();
 737                 constant = Constant.NotAConstant;
 738                 if ((this.codegenBinding = this.binding = scope.getBinding(tokens, bits & RestrictiveFlagMASK, this))
 739                         .isValidBinding()) {
 740                         switch (bits & RestrictiveFlagMASK) {
 741                                 case VARIABLE : //============only variable===========
 742                                 case TYPE | VARIABLE :
 743                                         if (binding instanceof LocalVariableBinding) {
 744                                                 if (!((LocalVariableBinding) binding).isFinal() && ((bits & DepthMASK) != 0))
 745                                                         scope.problemReporter().cannotReferToNonFinalOuterLocal(
 746                                                                 (LocalVariableBinding) binding,
 747                                                                 this);
 748                                                 bits &= ~RestrictiveFlagMASK; // clear bits
 749                                                 bits |= LOCAL;
 750                                                 return this.resolvedType = getOtherFieldBindings(scope);
 751                                         }
 752                                         if (binding instanceof FieldBinding) {
 753                                                 // check for forward references
 754                                                 FieldBinding fieldBinding = (FieldBinding) binding;
 755                                                 MethodScope methodScope = scope.methodScope();
 756                                                 if (methodScope.enclosingSourceType() == fieldBinding.declaringClass
 757                                                         && methodScope.fieldDeclarationIndex != MethodScope.NotInFieldDecl
 758                                                         && fieldBinding.id >= methodScope.fieldDeclarationIndex) {
 759                                                         if ((!fieldBinding.isStatic() || methodScope.isStatic)
 760                                                                 && this.indexOfFirstFieldBinding == 1)
 761                                                                 scope.problemReporter().forwardReference(this, 0, scope.enclosingSourceType());
 762                                                 }
 763                                                 bits &= ~RestrictiveFlagMASK; // clear bits
 764                                                 bits |= FIELD;
 765
 766                                                 // check for deprecated receiver type
 767                                                 // deprecation check for receiver type if not first token
 768                                                 if (indexOfFirstFieldBinding > 1) {
 769                                                         if (isTypeUseDeprecated(this.actualReceiverType, scope))
 770                                                                 scope.problemReporter().deprecatedType(this.actualReceiverType, this);
 771                                                 }
 772
 773                                                 return this.resolvedType = getOtherFieldBindings(scope);
 774                                         }
 775                                         // thus it was a type
 776                                         bits &= ~RestrictiveFlagMASK; // clear bits
 777                                         bits |= TYPE;
 778                                 case TYPE : //=============only type ==============
 779                                         if (isTypeUseDeprecated((TypeBinding) binding, scope))
 780                                                 scope.problemReporter().deprecatedType((TypeBinding) binding, this);
 781                                         return this.resolvedType = (TypeBinding) binding;
 782                         }
 783                 }
 784                 //========error cases===============
 785                 return this.resolvedType = this.reportError(scope);
 786         }
 787         public void setFieldIndex(int index) {
 788                 this.indexOfFirstFieldBinding = index;
 789         }
 790         public String toStringExpression() {
 791                 StringBuffer buffer = new StringBuffer();
 792                 for (int i = 0; i < tokens.length; i++) {
 793                         buffer.append(tokens[i]);
 794                         if (i < (tokens.length - 1)) {
 795                                 buffer.append("."); //$NON-NLS-1$
 796                         }
 797                 }
 798                 return buffer.toString();
 799         }
 800         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 801                 visitor.visit(this, scope);
 802                 visitor.endVisit(this, scope);
 803         }
 804         public String unboundReferenceErrorName() {
 805                 return new String(tokens[0]);
 806         }
 807 }