forked from eclipse-jdt/eclipse.jdt.core
-
Notifications
You must be signed in to change notification settings - Fork 0
/
TypeVariableBinding.java
1185 lines (1115 loc) · 48 KB
/
TypeVariableBinding.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*******************************************************************************
* Copyright (c) 2000, 2020 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann <stephan@cs.tu-berlin.de> - Contributions for
* bug 282152 - [1.5][compiler] Generics code rejected by Eclipse but accepted by javac
* bug 349326 - [1.7] new warning for missing try-with-resources
* bug 359362 - FUP of bug 349326: Resource leak on non-Closeable resource
* bug 358903 - Filter practically unimportant resource leak warnings
* bug 395002 - Self bound generic class doesn't resolve bounds properly for wildcards for certain parametrisation.
* bug 392384 - [1.8][compiler][null] Restore nullness info from type annotations in class files
* Bug 415043 - [1.8][null] Follow-up re null type annotations after bug 392099
* Bug 417295 - [1.8[[null] Massage type annotated null analysis to gel well with deep encoded type bindings.
* Bug 400874 - [1.8][compiler] Inference infrastructure should evolve to meet JLS8 18.x (Part G of JSR335 spec)
* Bug 426792 - [1.8][inference][impl] generify new type inference engine
* Bug 428019 - [1.8][compiler] Type inference failure with nested generic invocation.
* Bug 429384 - [1.8][null] implement conformance rules for null-annotated lower / upper type bounds
* Bug 431269 - [1.8][compiler][null] StackOverflow in nullAnnotatedReadableName
* Bug 431408 - Java 8 (1.8) generics bug
* Bug 435962 - [RC2] StackOverFlowError when building
* Bug 438458 - [1.8][null] clean up handling of null type annotations wrt type variables
* Bug 438250 - [1.8][null] NPE trying to report bogus null annotation conflict
* Bug 438179 - [1.8][null] 'Contradictory null annotations' error on type variable with explicit null-annotation.
* Bug 440143 - [1.8][null] one more case of contradictory null annotations regarding type variables
* Bug 440759 - [1.8][null] @NonNullByDefault should never affect wildcards and uses of a type variable
* Bug 441693 - [1.8][null] Bogus warning for type argument annotated with @NonNull
* Bug 456497 - [1.8][null] during inference nullness from target type is lost against weaker hint from applicability analysis
* Bug 456459 - Discrepancy between Eclipse compiler and javac - Enums, interfaces, and generics
* Bug 456487 - [1.8][null] @Nullable type variant of @NonNull-constrained type parameter causes grief
* Bug 462790 - [null] NPE in Expression.computeConversion()
* Bug 456532 - [1.8][null] ReferenceBinding.appendNullAnnotation() includes phantom annotations in error messages
* Jesper S Møller <jesper@selskabet.org> - Contributions for bug 381345 : [1.8] Take care of the Java 8 major version
* Bug 527554 - [18.3] Compiler support for JEP 286 Local-Variable Type
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;
import java.util.Arrays;
import java.util.Set;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.NullAnnotationMatching;
import org.eclipse.jdt.internal.compiler.ast.NullAnnotationMatching.CheckMode;
import org.eclipse.jdt.internal.compiler.ast.TypeParameter;
import org.eclipse.jdt.internal.compiler.ast.TypeReference;
import org.eclipse.jdt.internal.compiler.ast.Wildcard;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.eclipse.jdt.internal.compiler.lookup.TypeConstants.BoundCheckStatus;
/**
* Binding for a type parameter, held by source/binary type or method.
*/
public class TypeVariableBinding extends ReferenceBinding {
public Binding declaringElement; // binding of declaring type or method
public int rank; // declaration rank, can be used to match variable in parameterized type
/**
* Denote the first explicit (binding) bound amongst the supertypes (from declaration in source)
* If no superclass was specified, then it denotes the first superinterface, or null if none was specified.
*/
public TypeBinding firstBound; // MUST NOT be modified directly, use setter !
// actual resolved variable supertypes (if no superclass bound, then associated to Object)
public ReferenceBinding superclass; // MUST NOT be modified directly, use setter !
public ReferenceBinding[] superInterfaces; // MUST NOT be modified directly, use setter !
public char[] genericTypeSignature;
LookupEnvironment environment;
private ReferenceBinding prototype;
public TypeVariableBinding(char[] sourceName, Binding declaringElement, int rank, LookupEnvironment environment) {
this.prototype = this;
this.sourceName = sourceName;
this.declaringElement = declaringElement;
this.rank = rank;
this.modifiers = ClassFileConstants.AccPublic | ExtraCompilerModifiers.AccGenericSignature; // treat type var as public
this.tagBits |= TagBits.HasTypeVariable;
this.environment = environment;
this.typeBits = TypeIds.BitUninitialized;
computeId(environment);
}
// for subclass CaptureBinding
protected TypeVariableBinding(char[] sourceName, LookupEnvironment environment) {
this.prototype = this;
this.sourceName = sourceName;
this.modifiers = ClassFileConstants.AccPublic | ExtraCompilerModifiers.AccGenericSignature; // treat type var as public
this.tagBits |= TagBits.HasTypeVariable;
this.environment = environment;
this.typeBits = TypeIds.BitUninitialized;
// don't yet compute the ID!
}
public TypeVariableBinding(TypeVariableBinding prototype) {
super(prototype);
this.declaringElement = prototype.declaringElement;
this.rank = prototype.rank;
this.firstBound = prototype.firstBound;
this.superclass = prototype.superclass;
if (prototype.superInterfaces != null) {
int len = prototype.superInterfaces.length;
if (len > 0)
System.arraycopy(prototype.superInterfaces, 0, this.superInterfaces = new ReferenceBinding[len], 0, len);
else
this.superInterfaces = Binding.NO_SUPERINTERFACES;
}
this.genericTypeSignature = prototype.genericTypeSignature;
this.environment = prototype.environment;
prototype.tagBits |= TagBits.HasAnnotatedVariants;
this.tagBits &= ~TagBits.HasAnnotatedVariants;
this.prototype = prototype.prototype;
}
@Override
public TypeBinding prototype() {
return this.prototype;
}
/**
* Returns true if the argument type satisfies all bounds of the type parameter
* @param location if non-null this may be used for reporting errors relating to null type annotations (if enabled)
*/
public TypeConstants.BoundCheckStatus boundCheck(Substitution substitution, TypeBinding argumentType, Scope scope, ASTNode location) {
TypeConstants.BoundCheckStatus code = internalBoundCheck(substitution, argumentType, scope, location);
if (code == BoundCheckStatus.MISMATCH) {
if (argumentType instanceof TypeVariableBinding && scope != null) {
TypeBinding bound = ((TypeVariableBinding)argumentType).firstBound;
if (bound instanceof ParameterizedTypeBinding) {
BoundCheckStatus code2 = boundCheck(substitution, bound.capture(scope, -1, -1), scope, location); // no capture position needed as this capture will never escape this context
return code.betterOf(code2);
}
}
}
return code;
}
private TypeConstants.BoundCheckStatus internalBoundCheck(Substitution substitution, TypeBinding argumentType, Scope scope, ASTNode location) {
if (argumentType == TypeBinding.NULL || TypeBinding.equalsEquals(argumentType, this)) {
return BoundCheckStatus.OK;
}
boolean hasSubstitution = substitution != null;
if (!(argumentType instanceof ReferenceBinding || argumentType.isArrayType()))
return BoundCheckStatus.MISMATCH;
// special case for re-entrant source types (selection, code assist, etc)...
// can request additional types during hierarchy walk that are found as source types that also 'need' to connect their hierarchy
if (this.superclass == null)
return BoundCheckStatus.OK;
BoundCheckStatus nullStatus = BoundCheckStatus.OK;
boolean checkNullAnnotations = scope.environment().usesNullTypeAnnotations() && (location == null || (location.bits & ASTNode.InsideJavadoc) == 0);
if (argumentType.kind() == Binding.WILDCARD_TYPE) {
WildcardBinding wildcard = (WildcardBinding) argumentType;
switch(wildcard.boundKind) {
case Wildcard.EXTENDS :
boolean checkedAsOK = false;
TypeBinding wildcardBound = wildcard.bound;
if (TypeBinding.equalsEquals(wildcardBound, this))
checkedAsOK = true; // OK per JLS, but may require null checking below
boolean isArrayBound = wildcardBound.isArrayType();
if (!wildcardBound.isInterface()) {
TypeBinding substitutedSuperType = hasSubstitution ? Scope.substitute(substitution, this.superclass) : this.superclass;
if (!checkedAsOK) {
if (substitutedSuperType.id != TypeIds.T_JavaLangObject) {
if (isArrayBound) {
if (!wildcardBound.isCompatibleWith(substitutedSuperType, scope))
return BoundCheckStatus.MISMATCH;
} else {
TypeBinding match = wildcardBound.findSuperTypeOriginatingFrom(substitutedSuperType);
if (match != null) {
if (substitutedSuperType.isProvablyDistinct(match)) {
return BoundCheckStatus.MISMATCH;
}
} else {
match = substitutedSuperType.findSuperTypeOriginatingFrom(wildcardBound);
if (match != null) {
if (match.isProvablyDistinct(wildcardBound)) {
return BoundCheckStatus.MISMATCH;
}
} else {
if (denotesRelevantSuperClass(wildcardBound) && denotesRelevantSuperClass(substitutedSuperType)) {
// non-object real superclass should have produced a valid 'match' above
return BoundCheckStatus.MISMATCH;
}
// not fully spec-ed in JLS, but based on email communication (2017-09-13):
// (a) bound check should apply capture
// (b) capture applies glb
// (c) and then the glb should be checked for well-formedness (see Scope.isMalformedPair() - this part missing in JLS).
// Since we don't do (a), nor (b) for this case, we just directly proceed to (b) here.
// For (a) see ParameterizedTypeBinding.boundCheck() - comment added as of this commit
// for (b) see CaptureBinding.initializeBounds() - comment added as of this commit
if (Scope.greaterLowerBound(new TypeBinding[] {substitutedSuperType, wildcardBound}, scope, this.environment) == null) {
return BoundCheckStatus.MISMATCH;
}
}
}
}
}
}
if (checkNullAnnotations && argumentType.hasNullTypeAnnotations()) {
nullStatus = nullBoundCheck(scope, argumentType, substitutedSuperType, substitution, location, nullStatus);
}
}
boolean mustImplement = isArrayBound || ((ReferenceBinding)wildcardBound).isFinal();
for (ReferenceBinding superInterface : this.superInterfaces) {
TypeBinding substitutedSuperType = hasSubstitution ? Scope.substitute(substitution, superInterface) : superInterface;
if (!checkedAsOK) {
if (isArrayBound) {
if (!wildcardBound.isCompatibleWith(substitutedSuperType, scope))
return BoundCheckStatus.MISMATCH;
} else {
TypeBinding match = wildcardBound.findSuperTypeOriginatingFrom(substitutedSuperType);
if (match != null) {
if (substitutedSuperType.isProvablyDistinct(match)) {
return BoundCheckStatus.MISMATCH;
}
} else if (mustImplement) {
return BoundCheckStatus.MISMATCH; // cannot be extended further to satisfy missing bounds
}
}
}
if (checkNullAnnotations && argumentType.hasNullTypeAnnotations()) {
nullStatus = nullBoundCheck(scope, argumentType, substitutedSuperType, substitution, location, nullStatus);
}
}
if (nullStatus != null)
return nullStatus;
break;
case Wildcard.SUPER :
// if the wildcard is lower-bounded by a type variable that has no relevant upper bound there's nothing to check here (bug 282152):
if (wildcard.bound.isTypeVariable() && ((TypeVariableBinding)wildcard.bound).superclass.id == TypeIds.T_JavaLangObject) {
return nullBoundCheck(scope, argumentType, null, substitution, location, nullStatus);
} else {
TypeBinding bound = wildcard.bound;
if (checkNullAnnotations && this.environment.containsNullTypeAnnotation(wildcard.typeAnnotations))
bound = this.environment.createAnnotatedType(bound.withoutToplevelNullAnnotation(), wildcard.getTypeAnnotations());
BoundCheckStatus status = boundCheck(substitution, bound, scope, null); // do not report null-errors against the tweaked bound ...
if (status == BoundCheckStatus.NULL_PROBLEM && location != null)
scope.problemReporter().nullityMismatchTypeArgument(this, wildcard, location); // ... but against the wildcard
return status;
}
case Wildcard.UNBOUND :
if (checkNullAnnotations && argumentType.hasNullTypeAnnotations()) {
return nullBoundCheck(scope, argumentType, null, substitution, location, nullStatus);
}
break;
}
return BoundCheckStatus.OK;
} else if (checkNullAnnotations && argumentType.kind() == Binding.TYPE_PARAMETER && !argumentType.hasNullTypeAnnotations()) {
// refresh argumentType in case a nullness default(TYPE_PARAMETER) was applied late:
TypeVariableBinding tvb = (TypeVariableBinding) argumentType;
if (tvb.declaringElement instanceof SourceTypeBinding) {
TypeVariableBinding[] typeVariables = ((SourceTypeBinding) tvb.declaringElement).typeVariables;
if (typeVariables != null && typeVariables.length > tvb.rank) {
TypeVariableBinding refreshed = typeVariables[tvb.rank];
if (refreshed.id == argumentType.id)
argumentType = refreshed;
}
}
}
boolean unchecked = false;
if (this.superclass.id != TypeIds.T_JavaLangObject) {
TypeBinding substitutedSuperType = hasSubstitution ? Scope.substitute(substitution, this.superclass) : this.superclass;
if (TypeBinding.notEquals(substitutedSuperType, argumentType)) {
if (!argumentType.isCompatibleWith(substitutedSuperType, scope)) {
return BoundCheckStatus.MISMATCH;
}
TypeBinding match = argumentType.findSuperTypeOriginatingFrom(substitutedSuperType);
if (match != null){
// Enum#RAW is not a substitute for <E extends Enum<E>> (86838)
if (match.isRawType() && substitutedSuperType.isBoundParameterizedType())
unchecked = true;
}
}
if (checkNullAnnotations) {
nullStatus = nullBoundCheck(scope, argumentType, substitutedSuperType, substitution, location, nullStatus);
}
}
for (ReferenceBinding superInterface : this.superInterfaces) {
TypeBinding substitutedSuperType = hasSubstitution ? Scope.substitute(substitution, superInterface) : superInterface;
if (TypeBinding.notEquals(substitutedSuperType, argumentType)) {
if (!argumentType.isCompatibleWith(substitutedSuperType, scope)) {
return BoundCheckStatus.MISMATCH;
}
TypeBinding match = argumentType.findSuperTypeOriginatingFrom(substitutedSuperType);
if (match != null){
// Enum#RAW is not a substitute for <E extends Enum<E>> (86838)
if (match.isRawType() && substitutedSuperType.isBoundParameterizedType())
unchecked = true;
}
}
if (checkNullAnnotations) {
nullStatus = nullBoundCheck(scope, argumentType, substitutedSuperType, substitution, location, nullStatus);
}
}
if (checkNullAnnotations && nullStatus != BoundCheckStatus.NULL_PROBLEM) {
long nullBits = this.tagBits & TagBits.AnnotationNullMASK;
if (nullBits != 0 && nullBits != (argumentType.tagBits & TagBits.AnnotationNullMASK)) {
if (location != null)
scope.problemReporter().nullityMismatchTypeArgument(this, argumentType, location);
nullStatus = BoundCheckStatus.NULL_PROBLEM;
}
}
return unchecked ? BoundCheckStatus.UNCHECKED : nullStatus != null ? nullStatus : BoundCheckStatus.OK;
}
private BoundCheckStatus nullBoundCheck(Scope scope, TypeBinding argumentType, TypeBinding substitutedSuperType, Substitution substitution, ASTNode location, BoundCheckStatus previousStatus) {
NullAnnotationMatching status = NullAnnotationMatching.analyse(this, argumentType, substitutedSuperType, substitution, -1, null, CheckMode.BOUND_CHECK);
if (status.isAnyMismatch() && !status.isAnnotatedToUnannotated()) {
if (location != null)
scope.problemReporter().nullityMismatchTypeArgument(this, argumentType, location);
return BoundCheckStatus.NULL_PROBLEM;
}
return previousStatus;
}
boolean denotesRelevantSuperClass(TypeBinding type) {
if (!type.isTypeVariable() && !type.isInterface() && type.id != TypeIds.T_JavaLangObject)
return true;
ReferenceBinding aSuperClass = type.superclass();
return aSuperClass != null && aSuperClass.id != TypeIds.T_JavaLangObject && !aSuperClass.isTypeVariable();
}
public int boundsCount() {
if (this.firstBound == null)
return 0;
if (this.firstBound.isInterface())
return this.superInterfaces.length; // only interface bounds
return this.superInterfaces.length + 1; // class or array type isn't contained in superInterfaces
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding#canBeInstantiated()
*/
@Override
public boolean canBeInstantiated() {
return false;
}
/**
* Collect the substitutes into a map for certain type variables inside the receiver type
* e.g. {@code Collection<T>.collectSubstitutes(Collection<List<X>>, Map)} will populate Map with: {@code T --> List<X>}
* <pre>{@code
* Constraints:
* A << F corresponds to: F.collectSubstitutes(..., A, ..., CONSTRAINT_EXTENDS (1))
* A = F corresponds to: F.collectSubstitutes(..., A, ..., CONSTRAINT_EQUAL (0))
* A >> F corresponds to: F.collectSubstitutes(..., A, ..., CONSTRAINT_SUPER (2))
* }</pre>
*/
@Override
public void collectSubstitutes(Scope scope, TypeBinding actualType, InferenceContext inferenceContext, int constraint) {
// only infer for type params of the generic method
if (this.declaringElement != inferenceContext.genericMethod) return;
// cannot infer anything from a null type
switch (actualType.kind()) {
case Binding.BASE_TYPE :
if (actualType == TypeBinding.NULL) return;
TypeBinding boxedType = scope.environment().computeBoxingType(actualType);
if (boxedType == actualType) return; //$IDENTITY-COMPARISON$
actualType = boxedType;
break;
case Binding.POLY_TYPE: // cannot steer inference, only learn from it.
case Binding.WILDCARD_TYPE :
return; // wildcards are not true type expressions (JLS 15.12.2.7, p.453 2nd discussion)
}
// reverse constraint, to reflect variable on rhs: A << T --> T >: A
int variableConstraint;
switch(constraint) {
case TypeConstants.CONSTRAINT_EQUAL :
variableConstraint = TypeConstants.CONSTRAINT_EQUAL;
break;
case TypeConstants.CONSTRAINT_EXTENDS :
variableConstraint = TypeConstants.CONSTRAINT_SUPER;
break;
default:
//case CONSTRAINT_SUPER :
variableConstraint =TypeConstants.CONSTRAINT_EXTENDS;
break;
}
inferenceContext.recordSubstitute(this, actualType, variableConstraint);
}
/*
* declaringUniqueKey : genericTypeSignature
* p.X<T> { ... } --> Lp/X;:TT;
* p.X { <T> void foo() {...} } --> Lp/X;.foo()V:TT;
*/
@Override
public char[] computeUniqueKey(boolean isLeaf) {
StringBuilder buffer = new StringBuilder();
Binding declaring = this.declaringElement;
if (!isLeaf && declaring.kind() == Binding.METHOD) { // see https://bugs.eclipse.org/bugs/show_bug.cgi?id=97902
MethodBinding methodBinding = (MethodBinding) declaring;
ReferenceBinding declaringClass = methodBinding.declaringClass;
buffer.append(declaringClass.computeUniqueKey(false/*not a leaf*/));
buffer.append(':');
MethodBinding[] methods = declaringClass.methods();
if (methods != null)
for (int i = 0, length = methods.length; i < length; i++) {
MethodBinding binding = methods[i];
if (binding == methodBinding) {
buffer.append(i);
break;
}
}
} else {
buffer.append(declaring.computeUniqueKey(false/*not a leaf*/));
buffer.append(':');
}
buffer.append(genericTypeSignature());
int length = buffer.length();
char[] uniqueKey = new char[length];
buffer.getChars(0, length, uniqueKey, 0);
return uniqueKey;
}
@Override
public char[] constantPoolName() { /* java/lang/Object */
if (this.firstBound != null) {
return this.firstBound.constantPoolName();
}
return this.superclass.constantPoolName(); // java/lang/Object
}
@Override
public TypeBinding clone(TypeBinding enclosingType) {
return new TypeVariableBinding(this);
}
@Override
public String annotatedDebugName() {
StringBuilder buffer = new StringBuilder(10);
buffer.append(super.annotatedDebugName());
if (!this.inRecursiveFunction) {
this.inRecursiveFunction = true;
try {
if (this.superclass != null && TypeBinding.equalsEquals(this.firstBound, this.superclass)) {
buffer.append(" extends ").append(this.superclass.annotatedDebugName()); //$NON-NLS-1$
}
if (this.superInterfaces != null && this.superInterfaces != Binding.NO_SUPERINTERFACES) {
if (TypeBinding.notEquals(this.firstBound, this.superclass)) {
buffer.append(" extends "); //$NON-NLS-1$
}
for (int i = 0, length = this.superInterfaces.length; i < length; i++) {
if (i > 0 || TypeBinding.equalsEquals(this.firstBound, this.superclass)) {
buffer.append(" & "); //$NON-NLS-1$
}
buffer.append(this.superInterfaces[i].annotatedDebugName());
}
}
} finally {
this.inRecursiveFunction = false;
}
}
return buffer.toString();
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.TypeBinding#debugName()
*/
@Override
public String debugName() {
if (this.hasTypeAnnotations())
return super.annotatedDebugName();
return new String(this.sourceName);
}
@Override
public TypeBinding erasure() {
if (this.firstBound != null) {
return this.firstBound.erasure();
}
return this.superclass; // java/lang/Object
}
/**<pre>{@code
* T::Ljava/util/Map;:Ljava/io/Serializable;
* T:LY<TT;>
* }</pre>
*/
public char[] genericSignature() {
StringBuilder sig = new StringBuilder(10);
sig.append(this.sourceName).append(':');
int interfaceLength = this.superInterfaces == null ? 0 : this.superInterfaces.length;
if (interfaceLength == 0 || TypeBinding.equalsEquals(this.firstBound, this.superclass)) {
if (this.superclass != null)
sig.append(this.superclass.genericTypeSignature());
}
for (int i = 0; i < interfaceLength; i++) {
sig.append(':').append(this.superInterfaces[i].genericTypeSignature());
}
int sigLength = sig.length();
char[] genericSignature = new char[sigLength];
sig.getChars(0, sigLength, genericSignature, 0);
return genericSignature;
}
/**<pre>{@code
* T::Ljava/util/Map;:Ljava/io/Serializable;
* T:LY<TT;>
* }</pre>
*/
@Override
public char[] genericTypeSignature() {
if (this.genericTypeSignature != null) return this.genericTypeSignature;
return this.genericTypeSignature = CharOperation.concat('T', this.sourceName, ';');
}
/**
* Compute the initial type bounds for one inference variable as per JLS8 sect 18.1.3.
*/
TypeBound[] getTypeBounds(InferenceVariable variable, InferenceSubstitution theta) {
int n = boundsCount();
if (n == 0)
return NO_TYPE_BOUNDS;
TypeBound[] bounds = new TypeBound[n];
int idx = 0;
if (!this.firstBound.isInterface())
bounds[idx++] = TypeBound.createBoundOrDependency(theta, this.firstBound, variable);
for (ReferenceBinding superInterface : this.superInterfaces)
bounds[idx++] = TypeBound.createBoundOrDependency(theta, superInterface, variable);
return bounds;
}
boolean hasOnlyRawBounds() {
if (this.superclass != null && TypeBinding.equalsEquals(this.firstBound, this.superclass))
if (!this.superclass.isRawType())
return false;
if (this.superInterfaces != null)
for (ReferenceBinding superInterface : this.superInterfaces)
if (!superInterface.isRawType())
return false;
return true;
}
@Override
public boolean hasTypeBit(int bit) {
if (this.typeBits == TypeIds.BitUninitialized) {
// initialize from bounds
this.typeBits = 0;
if (this.superclass != null && this.superclass.hasTypeBit(~TypeIds.BitUninitialized))
this.typeBits |= (this.superclass.typeBits & TypeIds.InheritableBits);
if (this.superInterfaces != null)
for (ReferenceBinding superInterface : this.superInterfaces)
if (superInterface.hasTypeBit(~TypeIds.BitUninitialized))
this.typeBits |= (superInterface.typeBits & TypeIds.InheritableBits);
}
return (this.typeBits & bit) != 0;
}
/**
* Returns true if the type variable is directly bound to a given type
*/
public boolean isErasureBoundTo(TypeBinding type) {
if (TypeBinding.equalsEquals(this.superclass.erasure(), type))
return true;
for (ReferenceBinding superInterface : this.superInterfaces) {
if (TypeBinding.equalsEquals(superInterface.erasure(), type))
return true;
}
return false;
}
@Override
public boolean isHierarchyConnected() {
return (this.modifiers & ExtraCompilerModifiers.AccUnresolved) == 0;
}
/**
* Returns true if the 2 variables are playing exact same role: they have the same bounds, providing one is
* substituted with the other: {@code <T1 extends List<T1>>} is interchangeable with {@code <T2 extends List<T2>>}.
*/
public boolean isInterchangeableWith(TypeVariableBinding otherVariable, Substitution substitute) {
if (TypeBinding.equalsEquals(this, otherVariable))
return true;
int length = this.superInterfaces.length;
if (length != otherVariable.superInterfaces.length)
return false;
if (TypeBinding.notEquals(this.superclass, Scope.substitute(substitute, otherVariable.superclass)))
return false;
next : for (int i = 0; i < length; i++) {
TypeBinding superType = Scope.substitute(substitute, otherVariable.superInterfaces[i]);
for (int j = 0; j < length; j++)
if (TypeBinding.equalsEquals(superType, this.superInterfaces[j]))
continue next;
return false; // not a match
}
return true;
}
@Override
public boolean isSubtypeOf(TypeBinding other, boolean simulatingBugJDK8026527) {
if (isSubTypeOfRTL(other))
return true;
if (this.firstBound != null && this.firstBound.isSubtypeOf(other, simulatingBugJDK8026527))
return true;
if (this.superclass != null && this.superclass.isSubtypeOf(other, simulatingBugJDK8026527))
return true;
if (this.superInterfaces != null)
for (ReferenceBinding superInterface : this.superInterfaces)
if (superInterface.isSubtypeOf(other, false))
return true;
return other.id == TypeIds.T_JavaLangObject;
}
// to prevent infinite recursion when inspecting recursive generics:
boolean inRecursiveFunction = false;
@Override
public boolean enterRecursiveFunction() {
if (this.inRecursiveFunction)
return false;
this.inRecursiveFunction = true;
return true;
}
@Override
public void exitRecursiveFunction() {
this.inRecursiveFunction = false;
}
// to prevent infinite recursion when inspecting recursive generics:
boolean inRecursiveProjectionFunction = false;
public boolean enterRecursiveProjectionFunction() {
if (this.inRecursiveProjectionFunction)
return false;
this.inRecursiveProjectionFunction = true;
return true;
}
public void exitRecursiveProjectionFunction() {
this.inRecursiveProjectionFunction = false;
}
@Override
public boolean isProperType(boolean admitCapture18) {
// handle recursive calls:
if (this.inRecursiveFunction) // be optimistic, since this node is not an inference variable
return true;
this.inRecursiveFunction = true;
try {
if (this.superclass != null && !this.superclass.isProperType(admitCapture18)) {
return false;
}
if (this.superInterfaces != null)
for (ReferenceBinding superInterface : this.superInterfaces)
if (!superInterface.isProperType(admitCapture18)) {
return false;
}
return true;
} finally {
this.inRecursiveFunction = false;
}
}
@Override
TypeBinding substituteInferenceVariable(InferenceVariable var, TypeBinding substituteType) {
if (this.inRecursiveFunction) return this;
this.inRecursiveFunction = true;
try {
boolean haveSubstitution = false;
ReferenceBinding currentSuperclass = this.superclass;
if (currentSuperclass != null) {
currentSuperclass = (ReferenceBinding) currentSuperclass.substituteInferenceVariable(var, substituteType);
haveSubstitution |= TypeBinding.notEquals(currentSuperclass, this.superclass);
}
ReferenceBinding[] currentSuperInterfaces = null;
if (this.superInterfaces != null) {
int length = this.superInterfaces.length;
if (haveSubstitution)
System.arraycopy(this.superInterfaces, 0, currentSuperInterfaces=new ReferenceBinding[length], 0, length);
for (int i = 0; i < length; i++) {
ReferenceBinding currentSuperInterface = this.superInterfaces[i];
if (currentSuperInterface != null) {
currentSuperInterface = (ReferenceBinding) currentSuperInterface.substituteInferenceVariable(var, substituteType);
if (TypeBinding.notEquals(currentSuperInterface, this.superInterfaces[i])) {
if (currentSuperInterfaces == null)
System.arraycopy(this.superInterfaces, 0, currentSuperInterfaces=new ReferenceBinding[length], 0, length);
currentSuperInterfaces[i] = currentSuperInterface;
haveSubstitution = true;
}
}
}
}
if (haveSubstitution) {
TypeVariableBinding newVar = new TypeVariableBinding(this.sourceName, this.declaringElement, this.rank, this.environment);
newVar.superclass = currentSuperclass;
newVar.superInterfaces = currentSuperInterfaces;
newVar.tagBits = this.tagBits;
return newVar;
}
return this;
} finally {
this.inRecursiveFunction = false;
}
}
/**
* Returns true if the type was declared as a type variable
*/
@Override
public boolean isTypeVariable() {
return true;
}
// /**
// * Returns the original type variable for a given variable.
// * Only different from receiver for type variables of generic methods of parameterized types
// * e.g. X<U> { <V1 extends U> U foo(V1) } --> X<String> { <V2 extends String> String foo(V2) }
// * and V2.original() --> V1
// */
// public TypeVariableBinding original() {
// if (this.declaringElement.kind() == Binding.METHOD) {
// MethodBinding originalMethod = ((MethodBinding)this.declaringElement).original();
// if (originalMethod != this.declaringElement) {
// return originalMethod.typeVariables[this.rank];
// }
// } else {
// ReferenceBinding originalType = (ReferenceBinding)((ReferenceBinding)this.declaringElement).erasure();
// if (originalType != this.declaringElement) {
// return originalType.typeVariables()[this.rank];
// }
// }
// return this;
// }
@Override
public int kind() {
return Binding.TYPE_PARAMETER;
}
@Override
public boolean mentionsAny(TypeBinding[] parameters, int idx) {
if (this.inRecursiveFunction)
return false; // nothing seen
this.inRecursiveFunction = true;
try {
if (super.mentionsAny(parameters, idx))
return true;
if (this.superclass != null && this.superclass.mentionsAny(parameters, idx))
return true;
if (this.superInterfaces != null)
for (ReferenceBinding superInterface : this.superInterfaces) {
if (superInterface.mentionsAny(parameters, idx))
return true;
}
return false;
} finally {
this.inRecursiveFunction = false;
}
}
@Override
void collectInferenceVariables(Set<InferenceVariable> variables) {
if (this.inRecursiveFunction)
return; // nothing seen
this.inRecursiveFunction = true;
try {
if (this.superclass != null)
this.superclass.collectInferenceVariables(variables);
if (this.superInterfaces != null)
for (ReferenceBinding superInterface : this.superInterfaces) {
superInterface.collectInferenceVariables(variables);
}
} finally {
this.inRecursiveFunction = false;
}
}
public TypeBinding[] otherUpperBounds() {
if (this.firstBound == null)
return Binding.NO_TYPES;
if (TypeBinding.equalsEquals(this.firstBound, this.superclass))
return this.superInterfaces;
int otherLength = this.superInterfaces.length - 1;
if (otherLength > 0) {
TypeBinding[] otherBounds;
System.arraycopy(this.superInterfaces, 1, otherBounds = new TypeBinding[otherLength], 0, otherLength);
return otherBounds;
}
return Binding.NO_TYPES;
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding#readableName()
*/
@Override
public char[] readableName() {
return this.sourceName;
}
ReferenceBinding resolve() {
if ((this.modifiers & ExtraCompilerModifiers.AccUnresolved) == 0)
return this;
long nullTagBits = this.tagBits & TagBits.AnnotationNullMASK;
TypeBinding oldSuperclass = this.superclass, oldFirstInterface = null;
if (this.superclass != null) {
ReferenceBinding resolveType = (ReferenceBinding) BinaryTypeBinding.resolveType(this.superclass, this.environment, true /* raw conversion */);
this.tagBits |= resolveType.tagBits & TagBits.ContainsNestedTypeReferences;
long superNullTagBits = resolveType.tagBits & TagBits.AnnotationNullMASK;
if (superNullTagBits != 0L) {
if (nullTagBits == 0L) {
if ((superNullTagBits & TagBits.AnnotationNonNull) != 0) {
nullTagBits = superNullTagBits;
}
} else {
// System.err.println("TODO(stephan): report proper error: conflict binary TypeVariable vs. first bound");
}
}
this.setSuperClass(resolveType);
}
ReferenceBinding[] interfaces = this.superInterfaces;
int length;
if ((length = interfaces.length) != 0) {
oldFirstInterface = interfaces[0];
for (int i = length; --i >= 0;) {
ReferenceBinding resolveType = (ReferenceBinding) BinaryTypeBinding.resolveType(interfaces[i], this.environment, true /* raw conversion */);
this.tagBits |= resolveType.tagBits & TagBits.ContainsNestedTypeReferences;
long superNullTagBits = resolveType.tagBits & TagBits.AnnotationNullMASK;
if (superNullTagBits != 0L) {
if (nullTagBits == 0L) {
if ((superNullTagBits & TagBits.AnnotationNonNull) != 0) {
nullTagBits = superNullTagBits;
}
} else {
// System.err.println("TODO(stephan): report proper error: conflict binary TypeVariable vs. bound "+i);
}
}
interfaces[i] = resolveType;
}
}
if (nullTagBits != 0)
this.tagBits |= nullTagBits | TagBits.HasNullTypeAnnotation;
// refresh the firstBound in case it changed
if (this.firstBound != null) {
if (TypeBinding.equalsEquals(this.firstBound, oldSuperclass)) {
this.setFirstBound(this.superclass);
} else if (TypeBinding.equalsEquals(this.firstBound, oldFirstInterface)) {
this.setFirstBound(interfaces[0]);
}
}
this.modifiers &= ~ExtraCompilerModifiers.AccUnresolved;
return this;
}
@Override
public void setTypeAnnotations(AnnotationBinding[] annotations, boolean evalNullAnnotations) {
if (getClass() == TypeVariableBinding.class) {
// TVB only: if the declaration itself carries type annotations,
// make sure TypeSystem will still have an unannotated variant at position 0, to answer getUnannotated()
// (in this case the unannotated type is never explicit in source code, that's why we need this charade).
this.environment.typeSystem.forceRegisterAsDerived(this);
} else {
this.environment.getUnannotatedType(this); // exposes original TVB/capture to type system for id stamping purposes.
}
super.setTypeAnnotations(annotations, evalNullAnnotations);
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding#shortReadableName()
*/
@Override
public char[] shortReadableName() {
return readableName();
}
@Override
public ReferenceBinding superclass() {
return this.superclass;
}
@Override
public ReferenceBinding[] superInterfaces() {
return this.superInterfaces;
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
if (this.hasTypeAnnotations())
return annotatedDebugName();
StringBuilder buffer = new StringBuilder(10);
buffer.append('<').append(this.sourceName);//.append('[').append(this.rank).append(']');
if (this.superclass != null && TypeBinding.equalsEquals(this.firstBound, this.superclass)) {
buffer.append(" extends ").append(this.superclass.debugName()); //$NON-NLS-1$
}
if (this.superInterfaces != null && this.superInterfaces != Binding.NO_SUPERINTERFACES) {
if (TypeBinding.notEquals(this.firstBound, this.superclass)) {
buffer.append(" extends "); //$NON-NLS-1$
}
for (int i = 0, length = this.superInterfaces.length; i < length; i++) {
if (i > 0 || TypeBinding.equalsEquals(this.firstBound, this.superclass)) {
buffer.append(" & "); //$NON-NLS-1$
}
buffer.append(this.superInterfaces[i].debugName());
}
}
buffer.append('>');
return buffer.toString();
}
@Override
public char[] nullAnnotatedReadableName(CompilerOptions options, boolean shortNames) {
StringBuilder nameBuffer = new StringBuilder(10);
appendNullAnnotation(nameBuffer, options);
nameBuffer.append(this.sourceName());
if (!this.inRecursiveFunction) {
this.inRecursiveFunction = true;
try {
if (this.superclass != null && TypeBinding.equalsEquals(this.firstBound, this.superclass)) {
nameBuffer.append(" extends ").append(this.superclass.nullAnnotatedReadableName(options, shortNames)); //$NON-NLS-1$
}
if (this.superInterfaces != null && this.superInterfaces != Binding.NO_SUPERINTERFACES) {
if (TypeBinding.notEquals(this.firstBound, this.superclass)) {
nameBuffer.append(" extends "); //$NON-NLS-1$
}
for (int i = 0, length = this.superInterfaces.length; i < length; i++) {
if (i > 0 || TypeBinding.equalsEquals(this.firstBound, this.superclass)) {
nameBuffer.append(" & "); //$NON-NLS-1$
}
nameBuffer.append(this.superInterfaces[i].nullAnnotatedReadableName(options, shortNames));
}
}
} finally {
this.inRecursiveFunction = false;
}
}
int nameLength = nameBuffer.length();
char[] readableName = new char[nameLength];
nameBuffer.getChars(0, nameLength, readableName, 0);
return readableName;
}
@Override
protected void appendNullAnnotation(StringBuilder nameBuffer, CompilerOptions options) {
int oldSize = nameBuffer.length();
super.appendNullAnnotation(nameBuffer, options);
if (oldSize == nameBuffer.length()) { // nothing appended in super.appendNullAnnotation()?
if (hasNullTypeAnnotations()) {
// see if the prototype has null type annotations:
TypeVariableBinding[] typeVariables = null;
if (this.declaringElement instanceof ReferenceBinding) {
typeVariables = ((ReferenceBinding) this.declaringElement).typeVariables();
} else if (this.declaringElement instanceof MethodBinding) {
typeVariables = ((MethodBinding) this.declaringElement).typeVariables();
}
if (typeVariables != null && typeVariables.length > this.rank) {
TypeVariableBinding prototype = typeVariables[this.rank];
if (prototype != this)//$IDENTITY-COMPARISON$
prototype.appendNullAnnotation(nameBuffer, options);
}
}
}
}
@Override
public TypeBinding unannotated() {
return this.hasTypeAnnotations() ? this.environment.getUnannotatedType(this) : this;
}
@Override
public TypeBinding withoutToplevelNullAnnotation() {
if (!hasNullTypeAnnotations())
return this;
TypeBinding unannotated = this.environment.getUnannotatedType(this);
AnnotationBinding[] newAnnotations = this.environment.filterNullTypeAnnotations(this.typeAnnotations);
if (newAnnotations.length > 0)
return this.environment.createAnnotatedType(unannotated, newAnnotations);
return unannotated;
}
/**
* Upper bound doesn't perform erasure
*/
public TypeBinding upperBound() {
if (this.firstBound != null) {
return this.firstBound;
}
return this.superclass; // java/lang/Object
}
public TypeBinding[] allUpperBounds() {
if (this.superclass == null)
return this.superInterfaces;
if (this.superInterfaces == null || this.superInterfaces.length == 0)
return new TypeBinding[] { this.superclass };
int nInterfaces = this.superInterfaces.length;
TypeBinding[] all = Arrays.copyOf(this.superInterfaces, nInterfaces+1);
all[nInterfaces] = this.superclass;