1 /*
2 * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.code;
27
28 import java.lang.annotation.Annotation;
29 import java.util.ArrayDeque;
30 import java.util.Collections;
31 import java.util.EnumMap;
32 import java.util.Map;
33 import java.util.function.Predicate;
34
35 import javax.lang.model.type.*;
36
37 import com.sun.tools.javac.code.Symbol.*;
38 import com.sun.tools.javac.code.TypeMetadata.Entry;
39 import com.sun.tools.javac.code.Types.TypeMapping;
40 import com.sun.tools.javac.code.Types.UniqueType;
41 import com.sun.tools.javac.comp.Infer.IncorporationAction;
42 import com.sun.tools.javac.jvm.ClassFile;
43 import com.sun.tools.javac.jvm.PoolConstant;
44 import com.sun.tools.javac.util.*;
45 import com.sun.tools.javac.util.DefinedBy.Api;
46
47 import static com.sun.tools.javac.code.BoundKind.*;
48 import static com.sun.tools.javac.code.Flags.*;
49 import static com.sun.tools.javac.code.Kinds.Kind.*;
50 import static com.sun.tools.javac.code.TypeTag.*;
51
52 /** This class represents Java types. The class itself defines the behavior of
53 * the following types:
54 * <pre>
55 * base types (tags: BYTE, CHAR, SHORT, INT, LONG, FLOAT, DOUBLE, BOOLEAN),
56 * type `void' (tag: VOID),
57 * the bottom type (tag: BOT),
58 * the missing type (tag: NONE).
59 * </pre>
60 * <p>The behavior of the following types is defined in subclasses, which are
61 * all static inner classes of this class:
62 * <pre>
63 * class types (tag: CLASS, class: ClassType),
64 * array types (tag: ARRAY, class: ArrayType),
65 * method types (tag: METHOD, class: MethodType),
66 * package types (tag: PACKAGE, class: PackageType),
67 * type variables (tag: TYPEVAR, class: TypeVar),
68 * type arguments (tag: WILDCARD, class: WildcardType),
69 * generic method types (tag: FORALL, class: ForAll),
70 * the error type (tag: ERROR, class: ErrorType).
71 * </pre>
72 *
73 * <p><b>This is NOT part of any supported API.
74 * If you write code that depends on this, you do so at your own risk.
75 * This code and its internal interfaces are subject to change or
76 * deletion without notice.</b>
77 *
78 * @see TypeTag
79 */
80 public abstract class Type extends AnnoConstruct implements TypeMirror, PoolConstant {
81
82 /**
83 * Type metadata, Should be {@code null} for the default value.
84 *
85 * Note: it is an invariant that for any {@code TypeMetadata}
86 * class, a given {@code Type} may have at most one metadata array
87 * entry of that class.
88 */
89 protected final TypeMetadata metadata;
90
91 public TypeMetadata getMetadata() {
92 return metadata;
93 }
94
95 public Entry getMetadataOfKind(final Entry.Kind kind) {
96 return metadata != null ? metadata.get(kind) : null;
97 }
98
99 /** Constant type: no type at all. */
100 public static final JCNoType noType = new JCNoType() {
101 @Override @DefinedBy(Api.LANGUAGE_MODEL)
102 public String toString() {
103 return "none";
104 }
105 };
106
107 /** Constant type: special type to be used during recovery of deferred expressions. */
108 public static final JCNoType recoveryType = new JCNoType(){
109 @Override @DefinedBy(Api.LANGUAGE_MODEL)
110 public String toString() {
111 return "recovery";
112 }
113 };
114
115 /** Constant type: special type to be used for marking stuck trees. */
116 public static final JCNoType stuckType = new JCNoType() {
117 @Override @DefinedBy(Api.LANGUAGE_MODEL)
118 public String toString() {
119 return "stuck";
120 }
121 };
122
123 /** If this switch is turned on, the names of type variables
124 * and anonymous classes are printed with hashcodes appended.
125 */
126 public static boolean moreInfo = false;
127
128 /** The defining class / interface / package / type variable.
129 */
130 public TypeSymbol tsym;
131
132 @Override
133 public int poolTag() {
134 throw new AssertionError("Invalid pool entry");
135 }
136
137 @Override
138 public Object poolKey(Types types) {
139 return new UniqueType(this, types);
140 }
141
142 /**
143 * Checks if the current type tag is equal to the given tag.
144 * @return true if tag is equal to the current type tag.
145 */
146 public boolean hasTag(TypeTag tag) {
147 return tag == getTag();
148 }
149
150 /**
151 * Returns the current type tag.
152 * @return the value of the current type tag.
153 */
154 public abstract TypeTag getTag();
155
156 public boolean isNumeric() {
157 return false;
158 }
159
160 public boolean isIntegral() {
161 return false;
162 }
163
164 public boolean isPrimitive() {
165 return false;
166 }
167
168 public boolean isPrimitiveOrVoid() {
169 return false;
170 }
171
172 public boolean isReference() {
173 return false;
174 }
175
176 public boolean isNullOrReference() {
177 return false;
178 }
179
180 public boolean isPartial() {
181 return false;
182 }
183
184 /**
185 * The constant value of this type, null if this type does not
186 * have a constant value attribute. Only primitive types and
187 * strings (ClassType) can have a constant value attribute.
188 * @return the constant value attribute of this type
189 */
190 public Object constValue() {
191 return null;
192 }
193
194 /** Is this a constant type whose value is false?
195 */
196 public boolean isFalse() {
197 return false;
198 }
199
200 /** Is this a constant type whose value is true?
201 */
202 public boolean isTrue() {
203 return false;
204 }
205
206 /**
207 * Get the representation of this type used for modelling purposes.
208 * By default, this is itself. For ErrorType, a different value
209 * may be provided.
210 */
211 public Type getModelType() {
212 return this;
213 }
214
215 public static List<Type> getModelTypes(List<Type> ts) {
216 ListBuffer<Type> lb = new ListBuffer<>();
217 for (Type t: ts)
218 lb.append(t.getModelType());
219 return lb.toList();
220 }
221
222 /**For ErrorType, returns the original type, otherwise returns the type itself.
223 */
224 public Type getOriginalType() {
225 return this;
226 }
227
228 public <R,S> R accept(Type.Visitor<R,S> v, S s) { return v.visitType(this, s); }
229
230 /** Define a type given its tag, type symbol, and type annotations
231 */
232
233 public Type(TypeSymbol tsym, TypeMetadata metadata) {
234 Assert.checkNonNull(metadata);
235 this.tsym = tsym;
236 this.metadata = metadata;
237 }
238
239 /**
240 * A subclass of {@link Types.TypeMapping} which applies a mapping recursively to the subterms
241 * of a given type expression. This mapping returns the original type is no changes occurred
242 * when recursively mapping the original type's subterms.
243 */
244 public abstract static class StructuralTypeMapping<S> extends Types.TypeMapping<S> {
245
246 @Override
247 public Type visitClassType(ClassType t, S s) {
248 Type outer = t.getEnclosingType();
249 Type outer1 = visit(outer, s);
250 List<Type> typarams = t.getTypeArguments();
251 List<Type> typarams1 = visit(typarams, s);
252 if (outer1 == outer && typarams1 == typarams) return t;
253 else return new ClassType(outer1, typarams1, t.tsym, t.metadata) {
254 @Override
255 protected boolean needsStripping() {
256 return true;
257 }
258 };
259 }
260
261 @Override
262 public Type visitWildcardType(WildcardType wt, S s) {
263 Type t = wt.type;
264 if (t != null)
265 t = visit(t, s);
266 if (t == wt.type)
267 return wt;
268 else
269 return new WildcardType(t, wt.kind, wt.tsym, wt.bound, wt.metadata) {
270 @Override
271 protected boolean needsStripping() {
272 return true;
273 }
274 };
275 }
276
277 @Override
278 public Type visitArrayType(ArrayType t, S s) {
279 Type elemtype = t.elemtype;
280 Type elemtype1 = visit(elemtype, s);
281 if (elemtype1 == elemtype) return t;
282 else return new ArrayType(elemtype1, t.tsym, t.metadata) {
283 @Override
284 protected boolean needsStripping() {
285 return true;
286 }
287 };
288 }
289
290 @Override
291 public Type visitMethodType(MethodType t, S s) {
292 List<Type> argtypes = t.argtypes;
293 Type restype = t.restype;
294 List<Type> thrown = t.thrown;
295 List<Type> argtypes1 = visit(argtypes, s);
296 Type restype1 = visit(restype, s);
297 List<Type> thrown1 = visit(thrown, s);
298 if (argtypes1 == argtypes &&
299 restype1 == restype &&
300 thrown1 == thrown) return t;
301 else return new MethodType(argtypes1, restype1, thrown1, t.tsym) {
302 @Override
303 protected boolean needsStripping() {
304 return true;
305 }
306 };
307 }
308
309 @Override
310 public Type visitForAll(ForAll t, S s) {
311 return visit(t.qtype, s);
312 }
313 }
314
315 /** map a type function over all immediate descendants of this type
316 */
317 public <Z> Type map(TypeMapping<Z> mapping, Z arg) {
318 return mapping.visit(this, arg);
319 }
320
321 /** map a type function over all immediate descendants of this type (no arg version)
322 */
323 public <Z> Type map(TypeMapping<Z> mapping) {
324 return mapping.visit(this, null);
325 }
326
327 /** Define a constant type, of the same kind as this type
328 * and with given constant value
329 */
330 public Type constType(Object constValue) {
331 throw new AssertionError();
332 }
333
334 /**
335 * If this is a constant type, return its underlying type.
336 * Otherwise, return the type itself.
337 */
338 public Type baseType() {
339 return this;
340 }
341
342 /**
343 * Returns the original version of this type, before metadata were added. This routine is meant
344 * for internal use only (i.e. {@link Type#equalsIgnoreMetadata(Type)}, {@link Type#stripMetadata});
345 * it should not be used outside this class.
346 */
347 protected Type typeNoMetadata() {
348 return metadata == TypeMetadata.EMPTY ? this : baseType();
349 }
350
351 /**
352 * Create a new copy of this type but with the specified TypeMetadata.
353 */
354 public abstract Type cloneWithMetadata(TypeMetadata metadata);
355
356 /**
357 * Does this type require annotation stripping for API clients?
358 */
359 protected boolean needsStripping() {
360 return false;
361 }
362
363 /**
364 * Strip all metadata associated with this type - this could return a new clone of the type.
365 * This routine is only used to present the correct annotated types back to the users when types
366 * are accessed through compiler APIs; it should not be used anywhere in the compiler internals
367 * as doing so might result in performance penalties.
368 */
369 public Type stripMetadataIfNeeded() {
370 return needsStripping() ?
371 accept(stripMetadata, null) :
372 this;
373 }
374
375 public Type stripMetadata() {
376 return accept(stripMetadata, null);
377 }
378 //where
379 private static final TypeMapping<Void> stripMetadata = new StructuralTypeMapping<Void>() {
380 @Override
381 public Type visitClassType(ClassType t, Void aVoid) {
382 return super.visitClassType((ClassType)t.typeNoMetadata(), aVoid);
383 }
384
385 @Override
386 public Type visitArrayType(ArrayType t, Void aVoid) {
387 return super.visitArrayType((ArrayType)t.typeNoMetadata(), aVoid);
388 }
389
390 @Override
391 public Type visitTypeVar(TypeVar t, Void aVoid) {
392 return super.visitTypeVar((TypeVar)t.typeNoMetadata(), aVoid);
393 }
394
395 @Override
396 public Type visitWildcardType(WildcardType wt, Void aVoid) {
397 return super.visitWildcardType((WildcardType)wt.typeNoMetadata(), aVoid);
398 }
399 };
400
401 public Type annotatedType(final List<Attribute.TypeCompound> annos) {
402 final Entry annoMetadata = new TypeMetadata.Annotations(annos);
403 return cloneWithMetadata(metadata.combine(annoMetadata));
404 }
405
406 public boolean isAnnotated() {
407 final TypeMetadata.Annotations metadata =
408 (TypeMetadata.Annotations)getMetadataOfKind(Entry.Kind.ANNOTATIONS);
409
410 return null != metadata && !metadata.getAnnotations().isEmpty();
411 }
412
413 @Override @DefinedBy(Api.LANGUAGE_MODEL)
414 public List<Attribute.TypeCompound> getAnnotationMirrors() {
415 final TypeMetadata.Annotations metadata =
416 (TypeMetadata.Annotations)getMetadataOfKind(Entry.Kind.ANNOTATIONS);
417
418 return metadata == null ? List.nil() : metadata.getAnnotations();
419 }
420
421
422 @Override @DefinedBy(Api.LANGUAGE_MODEL)
423 public <A extends Annotation> A getAnnotation(Class<A> annotationType) {
424 return null;
425 }
426
427
428 @Override @DefinedBy(Api.LANGUAGE_MODEL)
429 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationType) {
430 @SuppressWarnings("unchecked")
431 A[] tmp = (A[]) java.lang.reflect.Array.newInstance(annotationType, 0);
432 return tmp;
433 }
434
435 /** Return the base types of a list of types.
436 */
437 public static List<Type> baseTypes(List<Type> ts) {
438 if (ts.nonEmpty()) {
439 Type t = ts.head.baseType();
440 List<Type> baseTypes = baseTypes(ts.tail);
441 if (t != ts.head || baseTypes != ts.tail)
442 return baseTypes.prepend(t);
443 }
444 return ts;
445 }
446
447 protected void appendAnnotationsString(StringBuilder sb,
448 boolean prefix) {
449 if (isAnnotated()) {
450 if (prefix) {
451 sb.append(" ");
452 }
453 sb.append(getAnnotationMirrors());
454 sb.append(" ");
455 }
456 }
457
458 protected void appendAnnotationsString(StringBuilder sb) {
459 appendAnnotationsString(sb, false);
460 }
461
462 /** The Java source which this type represents.
463 */
464 @DefinedBy(Api.LANGUAGE_MODEL)
465 public String toString() {
466 StringBuilder sb = new StringBuilder();
467 appendAnnotationsString(sb);
468 if (tsym == null || tsym.name == null) {
469 sb.append("<none>");
470 } else {
471 sb.append(tsym.name.toString());
472 }
473 if (moreInfo && hasTag(TYPEVAR)) {
474 sb.append(hashCode());
475 }
476 return sb.toString();
477 }
478
479 /**
480 * The Java source which this type list represents. A List is
481 * represented as a comma-separated listing of the elements in
482 * that list.
483 */
484 public static String toString(List<Type> ts) {
485 if (ts.isEmpty()) {
486 return "";
487 } else {
488 StringBuilder buf = new StringBuilder();
489 buf.append(ts.head.toString());
490 for (List<Type> l = ts.tail; l.nonEmpty(); l = l.tail)
491 buf.append(",").append(l.head.toString());
492 return buf.toString();
493 }
494 }
495
496 /**
497 * The constant value of this type, converted to String
498 */
499 public String stringValue() {
500 Object cv = Assert.checkNonNull(constValue());
501 return cv.toString();
502 }
503
504 /**
505 * Override this method with care. For most Type instances this should behave as ==.
506 */
507 @Override @DefinedBy(Api.LANGUAGE_MODEL)
508 public boolean equals(Object t) {
509 return this == t;
510 }
511
512 public boolean equalsIgnoreMetadata(Type t) {
513 return typeNoMetadata().equals(t.typeNoMetadata());
514 }
515
516 @Override @DefinedBy(Api.LANGUAGE_MODEL)
517 public int hashCode() {
518 return super.hashCode();
519 }
520
521 public String argtypes(boolean varargs) {
522 List<Type> args = getParameterTypes();
523 if (!varargs) return args.toString();
524 StringBuilder buf = new StringBuilder();
525 while (args.tail.nonEmpty()) {
526 buf.append(args.head);
527 args = args.tail;
528 buf.append(',');
529 }
530 if (args.head.hasTag(ARRAY)) {
531 buf.append(((ArrayType)args.head).elemtype);
532 if (args.head.getAnnotationMirrors().nonEmpty()) {
533 buf.append(args.head.getAnnotationMirrors());
534 }
535 buf.append("...");
536 } else {
537 buf.append(args.head);
538 }
539 return buf.toString();
540 }
541
542 /** Access methods.
543 */
544 public List<Type> getTypeArguments() { return List.nil(); }
545 public Type getEnclosingType() { return null; }
546 public List<Type> getParameterTypes() { return List.nil(); }
547 public Type getReturnType() { return null; }
548 public Type getReceiverType() { return null; }
549 public List<Type> getThrownTypes() { return List.nil(); }
550 public Type getUpperBound() { return null; }
551 public Type getLowerBound() { return null; }
552
553 /** Navigation methods, these will work for classes, type variables,
554 * foralls, but will return null for arrays and methods.
555 */
556
557 /** Return all parameters of this type and all its outer types in order
558 * outer (first) to inner (last).
559 */
560 public List<Type> allparams() { return List.nil(); }
561
562 /** Does this type contain "error" elements?
563 */
564 public boolean isErroneous() {
565 return false;
566 }
567
568 public static boolean isErroneous(List<Type> ts) {
569 for (List<Type> l = ts; l.nonEmpty(); l = l.tail)
570 if (l.head.isErroneous()) return true;
571 return false;
572 }
573
574 /** Is this type parameterized?
575 * A class type is parameterized if it has some parameters.
576 * An array type is parameterized if its element type is parameterized.
577 * All other types are not parameterized.
578 */
579 public boolean isParameterized() {
580 return false;
581 }
582
583 /** Is this type a raw type?
584 * A class type is a raw type if it misses some of its parameters.
585 * An array type is a raw type if its element type is raw.
586 * All other types are not raw.
587 * Type validation will ensure that the only raw types
588 * in a program are types that miss all their type variables.
589 */
590 public boolean isRaw() {
591 return false;
592 }
593
594 /**
595 * A compound type is a special class type whose supertypes are used to store a list
596 * of component types. There are two kinds of compound types: (i) intersection types
597 * {@see IntersectionClassType} and (ii) union types {@see UnionClassType}.
598 */
599 public boolean isCompound() {
600 return false;
601 }
602
603 public boolean isIntersection() {
604 return false;
605 }
606
607 public boolean isUnion() {
608 return false;
609 }
610
611 public boolean isInterface() {
612 return (tsym.flags() & INTERFACE) != 0;
613 }
614
615 public boolean isFinal() {
616 return (tsym.flags() & FINAL) != 0;
617 }
618
619 /**
620 * Does this type contain occurrences of type t?
621 */
622 public boolean contains(Type t) {
623 return t.equalsIgnoreMetadata(this);
624 }
625
626 public static boolean contains(List<Type> ts, Type t) {
627 for (List<Type> l = ts;
628 l.tail != null /*inlined: l.nonEmpty()*/;
629 l = l.tail)
630 if (l.head.contains(t)) return true;
631 return false;
632 }
633
634 /** Does this type contain an occurrence of some type in 'ts'?
635 */
636 public boolean containsAny(List<Type> ts) {
637 for (Type t : ts)
638 if (this.contains(t)) return true;
639 return false;
640 }
641
642 public static boolean containsAny(List<Type> ts1, List<Type> ts2) {
643 for (Type t : ts1)
644 if (t.containsAny(ts2)) return true;
645 return false;
646 }
647
648 public static List<Type> filter(List<Type> ts, Predicate<Type> tf) {
649 ListBuffer<Type> buf = new ListBuffer<>();
650 for (Type t : ts) {
651 if (tf.test(t)) {
652 buf.append(t);
653 }
654 }
655 return buf.toList();
656 }
657
658 public boolean isSuperBound() { return false; }
659 public boolean isExtendsBound() { return false; }
660 public boolean isUnbound() { return false; }
661 public Type withTypeVar(Type t) { return this; }
662
663 /** The underlying method type of this type.
664 */
665 public MethodType asMethodType() { throw new AssertionError(); }
666
667 /** Complete loading all classes in this type.
668 */
669 public void complete() {}
670
671 public TypeSymbol asElement() {
672 return tsym;
673 }
674
675 @Override @DefinedBy(Api.LANGUAGE_MODEL)
676 public TypeKind getKind() {
677 return TypeKind.OTHER;
678 }
679
680 @Override @DefinedBy(Api.LANGUAGE_MODEL)
681 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
682 throw new AssertionError();
683 }
684
685 public static class JCPrimitiveType extends Type
686 implements javax.lang.model.type.PrimitiveType {
687
688 TypeTag tag;
689
690 public JCPrimitiveType(TypeTag tag, TypeSymbol tsym) {
691 this(tag, tsym, TypeMetadata.EMPTY);
692 }
693
694 private JCPrimitiveType(TypeTag tag, TypeSymbol tsym, TypeMetadata metadata) {
695 super(tsym, metadata);
696 this.tag = tag;
697 Assert.check(tag.isPrimitive);
698 }
699
700 @Override
701 public JCPrimitiveType cloneWithMetadata(TypeMetadata md) {
702 return new JCPrimitiveType(tag, tsym, md) {
703 @Override
704 public Type baseType() { return JCPrimitiveType.this.baseType(); }
705 };
706 }
707
708 @Override
709 public boolean isNumeric() {
710 return tag != BOOLEAN;
711 }
712
713 @Override
714 public boolean isIntegral() {
715 switch (tag) {
716 case CHAR:
717 case BYTE:
718 case SHORT:
719 case INT:
720 case LONG:
721 return true;
722 default:
723 return false;
724 }
725 }
726
727 @Override
728 public boolean isPrimitive() {
729 return true;
730 }
731
732 @Override
733 public TypeTag getTag() {
734 return tag;
735 }
736
737 @Override
738 public boolean isPrimitiveOrVoid() {
739 return true;
740 }
741
742 /** Define a constant type, of the same kind as this type
743 * and with given constant value
744 */
745 @Override
746 public Type constType(Object constValue) {
747 final Object value = constValue;
748 return new JCPrimitiveType(tag, tsym, metadata) {
749 @Override
750 public Object constValue() {
751 return value;
752 }
753 @Override
754 public Type baseType() {
755 return tsym.type;
756 }
757 };
758 }
759
760 /**
761 * The constant value of this type, converted to String
762 */
763 @Override
764 public String stringValue() {
765 Object cv = Assert.checkNonNull(constValue());
766 if (tag == BOOLEAN) {
767 return ((Integer) cv).intValue() == 0 ? "false" : "true";
768 }
769 else if (tag == CHAR) {
770 return String.valueOf((char) ((Integer) cv).intValue());
771 }
772 else {
773 return cv.toString();
774 }
775 }
776
777 /** Is this a constant type whose value is false?
778 */
779 @Override
780 public boolean isFalse() {
781 return
782 tag == BOOLEAN &&
783 constValue() != null &&
784 ((Integer)constValue()).intValue() == 0;
785 }
786
787 /** Is this a constant type whose value is true?
788 */
789 @Override
790 public boolean isTrue() {
791 return
792 tag == BOOLEAN &&
793 constValue() != null &&
794 ((Integer)constValue()).intValue() != 0;
795 }
796
797 @Override @DefinedBy(Api.LANGUAGE_MODEL)
798 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
799 return v.visitPrimitive(this, p);
800 }
801
802 @Override @DefinedBy(Api.LANGUAGE_MODEL)
803 public TypeKind getKind() {
804 switch (tag) {
805 case BYTE: return TypeKind.BYTE;
806 case CHAR: return TypeKind.CHAR;
807 case SHORT: return TypeKind.SHORT;
808 case INT: return TypeKind.INT;
809 case LONG: return TypeKind.LONG;
810 case FLOAT: return TypeKind.FLOAT;
811 case DOUBLE: return TypeKind.DOUBLE;
812 case BOOLEAN: return TypeKind.BOOLEAN;
813 }
814 throw new AssertionError();
815 }
816
817 }
818
819 public static class WildcardType extends Type
820 implements javax.lang.model.type.WildcardType {
821
822 public Type type;
823 public BoundKind kind;
824 public TypeVar bound;
825
826 @Override
827 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
828 return v.visitWildcardType(this, s);
829 }
830
831 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym) {
832 this(type, kind, tsym, null, TypeMetadata.EMPTY);
833 }
834
835 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym,
836 TypeMetadata metadata) {
837 this(type, kind, tsym, null, metadata);
838 }
839
840 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym,
841 TypeVar bound) {
842 this(type, kind, tsym, bound, TypeMetadata.EMPTY);
843 }
844
845 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym,
846 TypeVar bound, TypeMetadata metadata) {
847 super(tsym, metadata);
848 this.type = Assert.checkNonNull(type);
849 this.kind = kind;
850 this.bound = bound;
851 }
852
853 @Override
854 public WildcardType cloneWithMetadata(TypeMetadata md) {
855 return new WildcardType(type, kind, tsym, bound, md) {
856 @Override
857 public Type baseType() { return WildcardType.this.baseType(); }
858 };
859 }
860
861 @Override
862 public TypeTag getTag() {
863 return WILDCARD;
864 }
865
866 @Override
867 public boolean contains(Type t) {
868 return kind != UNBOUND && type.contains(t);
869 }
870
871 public boolean isSuperBound() {
872 return kind == SUPER ||
873 kind == UNBOUND;
874 }
875 public boolean isExtendsBound() {
876 return kind == EXTENDS ||
877 kind == UNBOUND;
878 }
879 public boolean isUnbound() {
880 // is it `?` or `? extends Object`?
881 return kind == UNBOUND ||
882 (kind == EXTENDS && type.tsym.flatName() == type.tsym.name.table.names.java_lang_Object);
883 }
884
885 @Override
886 public boolean isReference() {
887 return true;
888 }
889
890 @Override
891 public boolean isNullOrReference() {
892 return true;
893 }
894
895 @Override
896 public Type withTypeVar(Type t) {
897 //-System.err.println(this+".withTypeVar("+t+");");//DEBUG
898 if (bound == t)
899 return this;
900 bound = (TypeVar)t;
901 return this;
902 }
903
904 boolean isPrintingBound = false;
905 @DefinedBy(Api.LANGUAGE_MODEL)
906 public String toString() {
907 StringBuilder s = new StringBuilder();
908 appendAnnotationsString(s);
909 s.append(kind.toString());
910 if (kind != UNBOUND)
911 s.append(type);
912 if (moreInfo && bound != null && !isPrintingBound)
913 try {
914 isPrintingBound = true;
915 s.append("{:").append(bound.getUpperBound()).append(":}");
916 } finally {
917 isPrintingBound = false;
918 }
919 return s.toString();
920 }
921
922 @DefinedBy(Api.LANGUAGE_MODEL)
923 public Type getExtendsBound() {
924 if (kind == EXTENDS)
925 return type;
926 else
927 return null;
928 }
929
930 @DefinedBy(Api.LANGUAGE_MODEL)
931 public Type getSuperBound() {
932 if (kind == SUPER)
933 return type;
934 else
935 return null;
936 }
937
938 @DefinedBy(Api.LANGUAGE_MODEL)
939 public TypeKind getKind() {
940 return TypeKind.WILDCARD;
941 }
942
943 @DefinedBy(Api.LANGUAGE_MODEL)
944 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
945 return v.visitWildcard(this, p);
946 }
947 }
948
949 public static class ClassType extends Type implements DeclaredType, LoadableConstant,
950 javax.lang.model.type.ErrorType {
951
952 /** The enclosing type of this type. If this is the type of an inner
953 * class, outer_field refers to the type of its enclosing
954 * instance class, in all other cases it refers to noType.
955 */
956 private Type outer_field;
957
958 /** The type parameters of this type (to be set once class is loaded).
959 */
960 public List<Type> typarams_field;
961
962 /** A cache variable for the type parameters of this type,
963 * appended to all parameters of its enclosing class.
964 * @see #allparams
965 */
966 public List<Type> allparams_field;
967
968 /** The supertype of this class (to be set once class is loaded).
969 */
970 public Type supertype_field;
971
972 /** The interfaces of this class (to be set once class is loaded).
973 */
974 public List<Type> interfaces_field;
975
976 /** All the interfaces of this class, including missing ones.
977 */
978 public List<Type> all_interfaces_field;
979
980 public ClassType(Type outer, List<Type> typarams, TypeSymbol tsym) {
981 this(outer, typarams, tsym, TypeMetadata.EMPTY);
982 }
983
984 public ClassType(Type outer, List<Type> typarams, TypeSymbol tsym,
985 TypeMetadata metadata) {
986 super(tsym, metadata);
987 this.outer_field = outer;
988 this.typarams_field = typarams;
989 this.allparams_field = null;
990 this.supertype_field = null;
991 this.interfaces_field = null;
992 }
993
994 public int poolTag() {
995 return ClassFile.CONSTANT_Class;
996 }
997
998 @Override
999 public ClassType cloneWithMetadata(TypeMetadata md) {
1000 return new ClassType(outer_field, typarams_field, tsym, md) {
1001 @Override
1002 public Type baseType() { return ClassType.this.baseType(); }
1003 };
1004 }
1005
1006 @Override
1007 public TypeTag getTag() {
1008 return CLASS;
1009 }
1010
1011 @Override
1012 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1013 return v.visitClassType(this, s);
1014 }
1015
1016 public Type constType(Object constValue) {
1017 final Object value = constValue;
1018 return new ClassType(getEnclosingType(), typarams_field, tsym, metadata) {
1019 @Override
1020 public Object constValue() {
1021 return value;
1022 }
1023 @Override
1024 public Type baseType() {
1025 return tsym.type;
1026 }
1027 };
1028 }
1029
1030 /** The Java source which this type represents.
1031 */
1032 @DefinedBy(Api.LANGUAGE_MODEL)
1033 public String toString() {
1034 StringBuilder buf = new StringBuilder();
1035 if (getEnclosingType().hasTag(CLASS) && tsym.owner.kind == TYP) {
1036 buf.append(getEnclosingType().toString());
1037 buf.append(".");
1038 appendAnnotationsString(buf);
1039 buf.append(className(tsym, false));
1040 } else {
1041 if (isAnnotated()) {
1042 if (!tsym.packge().isUnnamed()) {
1043 buf.append(tsym.packge());
1044 buf.append(".");
1045 }
1046 ListBuffer<Name> names = new ListBuffer<>();
1047 for (Symbol sym = tsym.owner; sym != null && sym.kind == TYP; sym = sym.owner) {
1048 names.prepend(sym.name);
1049 }
1050 for (Name name : names) {
1051 buf.append(name);
1052 buf.append(".");
1053 }
1054 appendAnnotationsString(buf);
1055 buf.append(tsym.name);
1056 } else {
1057 buf.append(className(tsym, true));
1058 }
1059 }
1060
1061 if (getTypeArguments().nonEmpty()) {
1062 buf.append('<');
1063 buf.append(getTypeArguments().toString());
1064 buf.append(">");
1065 }
1066 return buf.toString();
1067 }
1068 //where
1069 private String className(Symbol sym, boolean longform) {
1070 if (sym.name.isEmpty() && (sym.flags() & COMPOUND) != 0) {
1071 StringBuilder s = new StringBuilder(supertype_field.toString());
1072 for (List<Type> is=interfaces_field; is.nonEmpty(); is = is.tail) {
1073 s.append("&");
1074 s.append(is.head.toString());
1075 }
1076 return s.toString();
1077 } else if (sym.name.isEmpty()) {
1078 String s;
1079 ClassType norm = (ClassType) tsym.type;
1080 if (norm == null) {
1081 s = Log.getLocalizedString("anonymous.class", (Object)null);
1082 } else if (norm.interfaces_field != null && norm.interfaces_field.nonEmpty()) {
1083 s = Log.getLocalizedString("anonymous.class",
1084 norm.interfaces_field.head);
1085 } else {
1086 s = Log.getLocalizedString("anonymous.class",
1087 norm.supertype_field);
1088 }
1089 if (moreInfo)
1090 s += String.valueOf(sym.hashCode());
1091 return s;
1092 } else if (longform) {
1093 return sym.getQualifiedName().toString();
1094 } else {
1095 return sym.name.toString();
1096 }
1097 }
1098
1099 @DefinedBy(Api.LANGUAGE_MODEL)
1100 public List<Type> getTypeArguments() {
1101 if (typarams_field == null) {
1102 complete();
1103 if (typarams_field == null)
1104 typarams_field = List.nil();
1105 }
1106 return typarams_field;
1107 }
1108
1109 public boolean hasErasedSupertypes() {
1110 return isRaw();
1111 }
1112
1113 @DefinedBy(Api.LANGUAGE_MODEL)
1114 public Type getEnclosingType() {
1115 return outer_field;
1116 }
1117
1118 public void setEnclosingType(Type outer) {
1119 outer_field = outer;
1120 }
1121
1122 public List<Type> allparams() {
1123 if (allparams_field == null) {
1124 allparams_field = getTypeArguments().prependList(getEnclosingType().allparams());
1125 }
1126 return allparams_field;
1127 }
1128
1129 public boolean isErroneous() {
1130 return
1131 getEnclosingType().isErroneous() ||
1132 isErroneous(getTypeArguments()) ||
1133 this != tsym.type && tsym.type.isErroneous();
1134 }
1135
1136 public boolean isParameterized() {
1137 return allparams().tail != null;
1138 // optimization, was: allparams().nonEmpty();
1139 }
1140
1141 @Override
1142 public boolean isReference() {
1143 return true;
1144 }
1145
1146 @Override
1147 public boolean isNullOrReference() {
1148 return true;
1149 }
1150
1151 /** A cache for the rank. */
1152 int rank_field = -1;
1153
1154 /** A class type is raw if it misses some
1155 * of its type parameter sections.
1156 * After validation, this is equivalent to:
1157 * {@code allparams.isEmpty() && tsym.type.allparams.nonEmpty(); }
1158 */
1159 public boolean isRaw() {
1160 return
1161 this != tsym.type && // necessary, but not sufficient condition
1162 tsym.type.allparams().nonEmpty() &&
1163 allparams().isEmpty();
1164 }
1165
1166 public boolean contains(Type elem) {
1167 return
1168 elem.equalsIgnoreMetadata(this)
1169 || (isParameterized()
1170 && (getEnclosingType().contains(elem) || contains(getTypeArguments(), elem)))
1171 || (isCompound()
1172 && (supertype_field.contains(elem) || contains(interfaces_field, elem)));
1173 }
1174
1175 public void complete() {
1176 tsym.complete();
1177 }
1178
1179 @DefinedBy(Api.LANGUAGE_MODEL)
1180 public TypeKind getKind() {
1181 tsym.apiComplete();
1182 return tsym.kind == TYP ? TypeKind.DECLARED : TypeKind.ERROR;
1183 }
1184
1185 @DefinedBy(Api.LANGUAGE_MODEL)
1186 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1187 return v.visitDeclared(this, p);
1188 }
1189 }
1190
1191 public static class ErasedClassType extends ClassType {
1192 public ErasedClassType(Type outer, TypeSymbol tsym,
1193 TypeMetadata metadata) {
1194 super(outer, List.nil(), tsym, metadata);
1195 }
1196
1197 @Override
1198 public boolean hasErasedSupertypes() {
1199 return true;
1200 }
1201 }
1202
1203 // a clone of a ClassType that knows about the alternatives of a union type.
1204 public static class UnionClassType extends ClassType implements UnionType {
1205 final List<? extends Type> alternatives_field;
1206
1207 public UnionClassType(ClassType ct, List<? extends Type> alternatives) {
1208 // Presently no way to refer to this type directly, so we
1209 // cannot put annotations directly on it.
1210 super(ct.outer_field, ct.typarams_field, ct.tsym);
1211 allparams_field = ct.allparams_field;
1212 supertype_field = ct.supertype_field;
1213 interfaces_field = ct.interfaces_field;
1214 all_interfaces_field = ct.interfaces_field;
1215 alternatives_field = alternatives;
1216 }
1217
1218 @Override
1219 public UnionClassType cloneWithMetadata(TypeMetadata md) {
1220 throw new AssertionError("Cannot add metadata to a union type");
1221 }
1222
1223 public Type getLub() {
1224 return tsym.type;
1225 }
1226
1227 @DefinedBy(Api.LANGUAGE_MODEL)
1228 public java.util.List<? extends TypeMirror> getAlternatives() {
1229 return Collections.unmodifiableList(alternatives_field);
1230 }
1231
1232 @Override
1233 public boolean isUnion() {
1234 return true;
1235 }
1236
1237 @Override
1238 public boolean isCompound() {
1239 return getLub().isCompound();
1240 }
1241
1242 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1243 public TypeKind getKind() {
1244 return TypeKind.UNION;
1245 }
1246
1247 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1248 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1249 return v.visitUnion(this, p);
1250 }
1251
1252 public Iterable<? extends Type> getAlternativeTypes() {
1253 return alternatives_field;
1254 }
1255 }
1256
1257 // a clone of a ClassType that knows about the bounds of an intersection type.
1258 public static class IntersectionClassType extends ClassType implements IntersectionType {
1259
1260 public boolean allInterfaces;
1261
1262 public IntersectionClassType(List<Type> bounds, ClassSymbol csym, boolean allInterfaces) {
1263 // Presently no way to refer to this type directly, so we
1264 // cannot put annotations directly on it.
1265 super(Type.noType, List.nil(), csym);
1266 this.allInterfaces = allInterfaces;
1267 Assert.check((csym.flags() & COMPOUND) != 0);
1268 supertype_field = bounds.head;
1269 interfaces_field = bounds.tail;
1270 Assert.check(!supertype_field.tsym.isCompleted() ||
1271 !supertype_field.isInterface(), supertype_field);
1272 }
1273
1274 @Override
1275 public IntersectionClassType cloneWithMetadata(TypeMetadata md) {
1276 throw new AssertionError("Cannot add metadata to an intersection type");
1277 }
1278
1279 @DefinedBy(Api.LANGUAGE_MODEL)
1280 public java.util.List<? extends TypeMirror> getBounds() {
1281 return Collections.unmodifiableList(getExplicitComponents());
1282 }
1283
1284 @Override
1285 public boolean isCompound() {
1286 return true;
1287 }
1288
1289 public List<Type> getComponents() {
1290 return interfaces_field.prepend(supertype_field);
1291 }
1292
1293 @Override
1294 public boolean isIntersection() {
1295 return true;
1296 }
1297
1298 public List<Type> getExplicitComponents() {
1299 return allInterfaces ?
1300 interfaces_field :
1301 getComponents();
1302 }
1303
1304 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1305 public TypeKind getKind() {
1306 return TypeKind.INTERSECTION;
1307 }
1308
1309 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1310 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1311 return v.visitIntersection(this, p);
1312 }
1313 }
1314
1315 public static class ArrayType extends Type
1316 implements LoadableConstant, javax.lang.model.type.ArrayType {
1317
1318 public Type elemtype;
1319
1320 public ArrayType(Type elemtype, TypeSymbol arrayClass) {
1321 this(elemtype, arrayClass, TypeMetadata.EMPTY);
1322 }
1323
1324 public ArrayType(Type elemtype, TypeSymbol arrayClass,
1325 TypeMetadata metadata) {
1326 super(arrayClass, metadata);
1327 this.elemtype = elemtype;
1328 }
1329
1330 public ArrayType(ArrayType that) {
1331 //note: type metadata is deliberately shared here, as we want side-effects from annotation
1332 //processing to flow from original array to the cloned array.
1333 this(that.elemtype, that.tsym, that.getMetadata());
1334 }
1335
1336 public int poolTag() {
1337 return ClassFile.CONSTANT_Class;
1338 }
1339
1340 @Override
1341 public ArrayType cloneWithMetadata(TypeMetadata md) {
1342 return new ArrayType(elemtype, tsym, md) {
1343 @Override
1344 public Type baseType() { return ArrayType.this.baseType(); }
1345 };
1346 }
1347
1348 @Override
1349 public TypeTag getTag() {
1350 return ARRAY;
1351 }
1352
1353 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1354 return v.visitArrayType(this, s);
1355 }
1356
1357 @DefinedBy(Api.LANGUAGE_MODEL)
1358 public String toString() {
1359 StringBuilder sb = new StringBuilder();
1360
1361 // First append root component type
1362 Type t = elemtype;
1363 while (t.getKind() == TypeKind.ARRAY)
1364 t = ((ArrayType) t).getComponentType();
1365 sb.append(t);
1366
1367 // then append @Anno[] @Anno[] ... @Anno[]
1368 t = this;
1369 do {
1370 t.appendAnnotationsString(sb, true);
1371 sb.append("[]");
1372 t = ((ArrayType) t).getComponentType();
1373 } while (t.getKind() == TypeKind.ARRAY);
1374
1375 return sb.toString();
1376 }
1377
1378 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1379 public boolean equals(Object obj) {
1380 return (obj instanceof ArrayType arrayType)
1381 && (this == arrayType || elemtype.equals(arrayType.elemtype));
1382 }
1383
1384 @DefinedBy(Api.LANGUAGE_MODEL)
1385 public int hashCode() {
1386 return (ARRAY.ordinal() << 5) + elemtype.hashCode();
1387 }
1388
1389 public boolean isVarargs() {
1390 return false;
1391 }
1392
1393 public List<Type> allparams() { return elemtype.allparams(); }
1394
1395 public boolean isErroneous() {
1396 return elemtype.isErroneous();
1397 }
1398
1399 public boolean isParameterized() {
1400 return elemtype.isParameterized();
1401 }
1402
1403 @Override
1404 public boolean isReference() {
1405 return true;
1406 }
1407
1408 @Override
1409 public boolean isNullOrReference() {
1410 return true;
1411 }
1412
1413 public boolean isRaw() {
1414 return elemtype.isRaw();
1415 }
1416
1417 public ArrayType makeVarargs() {
1418 return new ArrayType(elemtype, tsym, metadata) {
1419 @Override
1420 public boolean isVarargs() {
1421 return true;
1422 }
1423 };
1424 }
1425
1426 public boolean contains(Type elem) {
1427 return elem.equalsIgnoreMetadata(this) || elemtype.contains(elem);
1428 }
1429
1430 public void complete() {
1431 elemtype.complete();
1432 }
1433
1434 @DefinedBy(Api.LANGUAGE_MODEL)
1435 public Type getComponentType() {
1436 return elemtype;
1437 }
1438
1439 @DefinedBy(Api.LANGUAGE_MODEL)
1440 public TypeKind getKind() {
1441 return TypeKind.ARRAY;
1442 }
1443
1444 @DefinedBy(Api.LANGUAGE_MODEL)
1445 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1446 return v.visitArray(this, p);
1447 }
1448 }
1449
1450 public static class MethodType extends Type implements ExecutableType, LoadableConstant {
1451
1452 public List<Type> argtypes;
1453 public Type restype;
1454 public List<Type> thrown;
1455
1456 /** The type annotations on the method receiver.
1457 */
1458 public Type recvtype;
1459
1460 public MethodType(List<Type> argtypes,
1461 Type restype,
1462 List<Type> thrown,
1463 TypeSymbol methodClass) {
1464 // Presently no way to refer to a method type directly, so
1465 // we cannot put type annotations on it.
1466 super(methodClass, TypeMetadata.EMPTY);
1467 this.argtypes = argtypes;
1468 this.restype = restype;
1469 this.thrown = thrown;
1470 }
1471
1472 @Override
1473 public MethodType cloneWithMetadata(TypeMetadata md) {
1474 throw new AssertionError("Cannot add metadata to a method type");
1475 }
1476
1477 @Override
1478 public TypeTag getTag() {
1479 return METHOD;
1480 }
1481
1482 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1483 return v.visitMethodType(this, s);
1484 }
1485
1486 /** The Java source which this type represents.
1487 *
1488 * XXX 06/09/99 iris This isn't correct Java syntax, but it probably
1489 * should be.
1490 */
1491 @DefinedBy(Api.LANGUAGE_MODEL)
1492 public String toString() {
1493 StringBuilder sb = new StringBuilder();
1494 appendAnnotationsString(sb);
1495 sb.append('(');
1496 sb.append(argtypes);
1497 sb.append(')');
1498 sb.append(restype);
1499 return sb.toString();
1500 }
1501
1502 @DefinedBy(Api.LANGUAGE_MODEL)
1503 public List<Type> getParameterTypes() { return argtypes; }
1504 @DefinedBy(Api.LANGUAGE_MODEL)
1505 public Type getReturnType() { return restype; }
1506 @DefinedBy(Api.LANGUAGE_MODEL)
1507 public Type getReceiverType() {
1508 return (recvtype == null) ? Type.noType : recvtype;
1509 }
1510 @DefinedBy(Api.LANGUAGE_MODEL)
1511 public List<Type> getThrownTypes() { return thrown; }
1512
1513 public boolean isErroneous() {
1514 return
1515 isErroneous(argtypes) ||
1516 restype != null && restype.isErroneous();
1517 }
1518
1519 @Override
1520 public int poolTag() {
1521 return ClassFile.CONSTANT_MethodType;
1522 }
1523
1524 public boolean contains(Type elem) {
1525 return elem.equalsIgnoreMetadata(this) || contains(argtypes, elem) || restype.contains(elem) || contains(thrown, elem);
1526 }
1527
1528 public MethodType asMethodType() { return this; }
1529
1530 public void complete() {
1531 for (List<Type> l = argtypes; l.nonEmpty(); l = l.tail)
1532 l.head.complete();
1533 restype.complete();
1534 recvtype.complete();
1535 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1536 l.head.complete();
1537 }
1538
1539 @DefinedBy(Api.LANGUAGE_MODEL)
1540 public List<TypeVar> getTypeVariables() {
1541 return List.nil();
1542 }
1543
1544 public TypeSymbol asElement() {
1545 return null;
1546 }
1547
1548 @DefinedBy(Api.LANGUAGE_MODEL)
1549 public TypeKind getKind() {
1550 return TypeKind.EXECUTABLE;
1551 }
1552
1553 @DefinedBy(Api.LANGUAGE_MODEL)
1554 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1555 return v.visitExecutable(this, p);
1556 }
1557 }
1558
1559 public static class PackageType extends Type implements NoType {
1560
1561 PackageType(PackageSymbol tsym) {
1562 // Package types cannot be annotated
1563 super(tsym, TypeMetadata.EMPTY);
1564 }
1565
1566 @Override
1567 public PackageType cloneWithMetadata(TypeMetadata md) {
1568 throw new AssertionError("Cannot add metadata to a package type");
1569 }
1570
1571 @Override
1572 public TypeTag getTag() {
1573 return PACKAGE;
1574 }
1575
1576 @Override
1577 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1578 return v.visitPackageType(this, s);
1579 }
1580
1581 @DefinedBy(Api.LANGUAGE_MODEL)
1582 public String toString() {
1583 return tsym.getQualifiedName().toString();
1584 }
1585
1586 @DefinedBy(Api.LANGUAGE_MODEL)
1587 public TypeKind getKind() {
1588 return TypeKind.PACKAGE;
1589 }
1590
1591 @DefinedBy(Api.LANGUAGE_MODEL)
1592 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1593 return v.visitNoType(this, p);
1594 }
1595 }
1596
1597 public static class ModuleType extends Type implements NoType {
1598
1599 ModuleType(ModuleSymbol tsym) {
1600 // Module types cannot be annotated
1601 super(tsym, TypeMetadata.EMPTY);
1602 }
1603
1604 @Override
1605 public ModuleType cloneWithMetadata(TypeMetadata md) {
1606 throw new AssertionError("Cannot add metadata to a module type");
1607 }
1608
1609 @Override
1610 public ModuleType annotatedType(List<Attribute.TypeCompound> annos) {
1611 throw new AssertionError("Cannot annotate a module type");
1612 }
1613
1614 @Override
1615 public TypeTag getTag() {
1616 return TypeTag.MODULE;
1617 }
1618
1619 @Override
1620 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1621 return v.visitModuleType(this, s);
1622 }
1623
1624 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1625 public String toString() {
1626 return tsym.getQualifiedName().toString();
1627 }
1628
1629 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1630 public TypeKind getKind() {
1631 return TypeKind.MODULE;
1632 }
1633
1634 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1635 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1636 return v.visitNoType(this, p);
1637 }
1638 }
1639
1640 public static class TypeVar extends Type implements TypeVariable {
1641
1642 /** The upper bound of this type variable; set from outside.
1643 * Must be nonempty once it is set.
1644 * For a bound, `bound' is the bound type itself.
1645 * Multiple bounds are expressed as a single class type which has the
1646 * individual bounds as superclass, respectively interfaces.
1647 * The class type then has as `tsym' a compiler generated class `c',
1648 * which has a flag COMPOUND and whose owner is the type variable
1649 * itself. Furthermore, the erasure_field of the class
1650 * points to the first class or interface bound.
1651 */
1652 private Type _bound = null;
1653
1654 /** The lower bound of this type variable.
1655 * TypeVars don't normally have a lower bound, so it is normally set
1656 * to syms.botType.
1657 * Subtypes, such as CapturedType, may provide a different value.
1658 */
1659 public Type lower;
1660
1661 public TypeVar(Name name, Symbol owner, Type lower) {
1662 super(null, TypeMetadata.EMPTY);
1663 Assert.checkNonNull(lower);
1664 tsym = new TypeVariableSymbol(0, name, this, owner);
1665 this.setUpperBound(null);
1666 this.lower = lower;
1667 }
1668
1669 public TypeVar(TypeSymbol tsym, Type bound, Type lower) {
1670 this(tsym, bound, lower, TypeMetadata.EMPTY);
1671 }
1672
1673 public TypeVar(TypeSymbol tsym, Type bound, Type lower,
1674 TypeMetadata metadata) {
1675 super(tsym, metadata);
1676 Assert.checkNonNull(lower);
1677 this.setUpperBound(bound);
1678 this.lower = lower;
1679 }
1680
1681 @Override
1682 public TypeVar cloneWithMetadata(TypeMetadata md) {
1683 return new TypeVar(tsym, getUpperBound(), lower, md) {
1684 @Override
1685 public Type baseType() { return TypeVar.this.baseType(); }
1686
1687 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1688 public Type getUpperBound() { return TypeVar.this.getUpperBound(); }
1689
1690 public void setUpperBound(Type bound) { TypeVar.this.setUpperBound(bound); }
1691 };
1692 }
1693
1694 @Override
1695 public TypeTag getTag() {
1696 return TYPEVAR;
1697 }
1698
1699 @Override
1700 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1701 return v.visitTypeVar(this, s);
1702 }
1703
1704 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1705 public Type getUpperBound() { return _bound; }
1706
1707 public void setUpperBound(Type bound) { this._bound = bound; }
1708
1709 int rank_field = -1;
1710
1711 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1712 public Type getLowerBound() {
1713 return lower;
1714 }
1715
1716 @DefinedBy(Api.LANGUAGE_MODEL)
1717 public TypeKind getKind() {
1718 return TypeKind.TYPEVAR;
1719 }
1720
1721 public boolean isCaptured() {
1722 return false;
1723 }
1724
1725 @Override
1726 public boolean isReference() {
1727 return true;
1728 }
1729
1730 @Override
1731 public boolean isNullOrReference() {
1732 return true;
1733 }
1734
1735 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1736 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1737 return v.visitTypeVariable(this, p);
1738 }
1739 }
1740
1741 /** A captured type variable comes from wildcards which can have
1742 * both upper and lower bound. CapturedType extends TypeVar with
1743 * a lower bound.
1744 */
1745 public static class CapturedType extends TypeVar {
1746
1747 public WildcardType wildcard;
1748
1749 public CapturedType(Name name,
1750 Symbol owner,
1751 Type upper,
1752 Type lower,
1753 WildcardType wildcard) {
1754 super(name, owner, lower);
1755 this.lower = Assert.checkNonNull(lower);
1756 this.setUpperBound(upper);
1757 this.wildcard = wildcard;
1758 }
1759
1760 public CapturedType(TypeSymbol tsym,
1761 Type bound,
1762 Type upper,
1763 Type lower,
1764 WildcardType wildcard,
1765 TypeMetadata metadata) {
1766 super(tsym, bound, lower, metadata);
1767 this.wildcard = wildcard;
1768 }
1769
1770 @Override
1771 public CapturedType cloneWithMetadata(TypeMetadata md) {
1772 return new CapturedType(tsym, getUpperBound(), getUpperBound(), lower, wildcard, md) {
1773 @Override
1774 public Type baseType() { return CapturedType.this.baseType(); }
1775
1776 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1777 public Type getUpperBound() { return CapturedType.this.getUpperBound(); }
1778
1779 public void setUpperBound(Type bound) { CapturedType.this.setUpperBound(bound); }
1780 };
1781 }
1782
1783 @Override
1784 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1785 return v.visitCapturedType(this, s);
1786 }
1787
1788 @Override
1789 public boolean isCaptured() {
1790 return true;
1791 }
1792
1793 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1794 public String toString() {
1795 StringBuilder sb = new StringBuilder();
1796 appendAnnotationsString(sb);
1797 sb.append("capture#");
1798 sb.append((hashCode() & 0xFFFFFFFFL) % Printer.PRIME);
1799 sb.append(" of ");
1800 sb.append(wildcard);
1801 return sb.toString();
1802 }
1803 }
1804
1805 public abstract static class DelegatedType extends Type {
1806 public Type qtype;
1807 public TypeTag tag;
1808
1809 public DelegatedType(TypeTag tag, Type qtype) {
1810 this(tag, qtype, TypeMetadata.EMPTY);
1811 }
1812
1813 public DelegatedType(TypeTag tag, Type qtype,
1814 TypeMetadata metadata) {
1815 super(qtype.tsym, metadata);
1816 this.tag = tag;
1817 this.qtype = qtype;
1818 }
1819
1820 public TypeTag getTag() { return tag; }
1821 @DefinedBy(Api.LANGUAGE_MODEL)
1822 public String toString() { return qtype.toString(); }
1823 public List<Type> getTypeArguments() { return qtype.getTypeArguments(); }
1824 public Type getEnclosingType() { return qtype.getEnclosingType(); }
1825 public List<Type> getParameterTypes() { return qtype.getParameterTypes(); }
1826 public Type getReturnType() { return qtype.getReturnType(); }
1827 public Type getReceiverType() { return qtype.getReceiverType(); }
1828 public List<Type> getThrownTypes() { return qtype.getThrownTypes(); }
1829 public List<Type> allparams() { return qtype.allparams(); }
1830 public Type getUpperBound() { return qtype.getUpperBound(); }
1831 public boolean isErroneous() { return qtype.isErroneous(); }
1832 }
1833
1834 /**
1835 * The type of a generic method type. It consists of a method type and
1836 * a list of method type-parameters that are used within the method
1837 * type.
1838 */
1839 public static class ForAll extends DelegatedType implements ExecutableType {
1840 public List<Type> tvars;
1841
1842 public ForAll(List<Type> tvars, Type qtype) {
1843 super(FORALL, (MethodType)qtype);
1844 this.tvars = tvars;
1845 }
1846
1847 @Override
1848 public ForAll cloneWithMetadata(TypeMetadata md) {
1849 throw new AssertionError("Cannot add metadata to a forall type");
1850 }
1851
1852 @Override
1853 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1854 return v.visitForAll(this, s);
1855 }
1856
1857 @DefinedBy(Api.LANGUAGE_MODEL)
1858 public String toString() {
1859 StringBuilder sb = new StringBuilder();
1860 appendAnnotationsString(sb);
1861 sb.append('<');
1862 sb.append(tvars);
1863 sb.append('>');
1864 sb.append(qtype);
1865 return sb.toString();
1866 }
1867
1868 public List<Type> getTypeArguments() { return tvars; }
1869
1870 public boolean isErroneous() {
1871 return qtype.isErroneous();
1872 }
1873
1874 public boolean contains(Type elem) {
1875 return qtype.contains(elem);
1876 }
1877
1878 public MethodType asMethodType() {
1879 return (MethodType)qtype;
1880 }
1881
1882 public void complete() {
1883 for (List<Type> l = tvars; l.nonEmpty(); l = l.tail) {
1884 ((TypeVar)l.head).getUpperBound().complete();
1885 }
1886 qtype.complete();
1887 }
1888
1889 @DefinedBy(Api.LANGUAGE_MODEL)
1890 public List<TypeVar> getTypeVariables() {
1891 return List.convert(TypeVar.class, getTypeArguments());
1892 }
1893
1894 @DefinedBy(Api.LANGUAGE_MODEL)
1895 public TypeKind getKind() {
1896 return TypeKind.EXECUTABLE;
1897 }
1898
1899 @DefinedBy(Api.LANGUAGE_MODEL)
1900 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1901 return v.visitExecutable(this, p);
1902 }
1903 }
1904
1905 /** A class for inference variables, for use during method/diamond type
1906 * inference. An inference variable has upper/lower bounds and a set
1907 * of equality constraints. Such bounds are set during subtyping, type-containment,
1908 * type-equality checks, when the types being tested contain inference variables.
1909 * A change listener can be attached to an inference variable, to receive notifications
1910 * whenever the bounds of an inference variable change.
1911 */
1912 public static class UndetVar extends DelegatedType {
1913
1914 enum Kind {
1915 NORMAL,
1916 CAPTURED,
1917 THROWS;
1918 }
1919
1920 /** Inference variable change listener. The listener method is called
1921 * whenever a change to the inference variable's bounds occurs
1922 */
1923 public interface UndetVarListener {
1924 /** called when some inference variable bounds (of given kinds ibs) change */
1925 void varBoundChanged(UndetVar uv, InferenceBound ib, Type bound, boolean update);
1926 /** called when the inferred type is set on some inference variable */
1927 default void varInstantiated(UndetVar uv) { Assert.error(); }
1928 }
1929
1930 /**
1931 * Inference variable bound kinds
1932 */
1933 public enum InferenceBound {
1934 /** lower bounds */
1935 LOWER {
1936 public InferenceBound complement() { return UPPER; }
1937 },
1938 /** equality constraints */
1939 EQ {
1940 public InferenceBound complement() { return EQ; }
1941 },
1942 /** upper bounds */
1943 UPPER {
1944 public InferenceBound complement() { return LOWER; }
1945 };
1946
1947 public abstract InferenceBound complement();
1948
1949 public boolean lessThan(InferenceBound that) {
1950 if (that == this) {
1951 return false;
1952 } else {
1953 switch (that) {
1954 case UPPER: return true;
1955 case LOWER: return false;
1956 case EQ: return (this != UPPER);
1957 default:
1958 Assert.error("Cannot get here!");
1959 return false;
1960 }
1961 }
1962 }
1963 }
1964
1965 /** list of incorporation actions (used by the incorporation engine). */
1966 public ArrayDeque<IncorporationAction> incorporationActions = new ArrayDeque<>();
1967
1968 /** inference variable bounds */
1969 protected Map<InferenceBound, List<Type>> bounds;
1970
1971 /** inference variable's inferred type (set from Infer.java) */
1972 private Type inst = null;
1973
1974 /** number of declared (upper) bounds */
1975 public int declaredCount;
1976
1977 /** inference variable's change listener */
1978 public UndetVarListener listener = null;
1979
1980 Kind kind;
1981
1982 @Override
1983 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1984 return v.visitUndetVar(this, s);
1985 }
1986
1987 public UndetVar(TypeVar origin, UndetVarListener listener, Types types) {
1988 // This is a synthesized internal type, so we cannot annotate it.
1989 super(UNDETVAR, origin);
1990 this.kind = origin.isCaptured() ?
1991 Kind.CAPTURED :
1992 Kind.NORMAL;
1993 this.listener = listener;
1994 bounds = new EnumMap<>(InferenceBound.class);
1995 List<Type> declaredBounds = types.getBounds(origin);
1996 declaredCount = declaredBounds.length();
1997 bounds.put(InferenceBound.UPPER, List.nil());
1998 bounds.put(InferenceBound.LOWER, List.nil());
1999 bounds.put(InferenceBound.EQ, List.nil());
2000 for (Type t : declaredBounds.reverse()) {
2001 //add bound works in reverse order
2002 addBound(InferenceBound.UPPER, t, types, true);
2003 }
2004 if (origin.isCaptured() && !origin.lower.hasTag(BOT)) {
2005 //add lower bound if needed
2006 addBound(InferenceBound.LOWER, origin.lower, types, true);
2007 }
2008 }
2009
2010 @DefinedBy(Api.LANGUAGE_MODEL)
2011 public String toString() {
2012 StringBuilder sb = new StringBuilder();
2013 appendAnnotationsString(sb);
2014 if (inst == null) {
2015 sb.append(qtype);
2016 sb.append('?');
2017 } else {
2018 sb.append(inst);
2019 }
2020 return sb.toString();
2021 }
2022
2023 public String debugString() {
2024 String result = "inference var = " + qtype + "\n";
2025 if (inst != null) {
2026 result += "inst = " + inst + '\n';
2027 }
2028 for (InferenceBound bound: InferenceBound.values()) {
2029 List<Type> aboundList = bounds.get(bound);
2030 if (aboundList != null && aboundList.size() > 0) {
2031 result += bound + " = " + aboundList + '\n';
2032 }
2033 }
2034 return result;
2035 }
2036
2037 public void setThrow() {
2038 if (this.kind == Kind.CAPTURED) {
2039 //invalid state transition
2040 throw new IllegalStateException();
2041 }
2042 this.kind = Kind.THROWS;
2043 }
2044
2045 /**
2046 * Returns a new copy of this undet var.
2047 */
2048 public UndetVar dup(Types types) {
2049 UndetVar uv2 = new UndetVar((TypeVar)qtype, listener, types);
2050 dupTo(uv2, types);
2051 return uv2;
2052 }
2053
2054 /**
2055 * Dumps the contents of this undet var on another undet var.
2056 */
2057 public void dupTo(UndetVar uv2, Types types) {
2058 uv2.listener = null;
2059 uv2.bounds.clear();
2060 for (InferenceBound ib : InferenceBound.values()) {
2061 uv2.bounds.put(ib, List.nil());
2062 for (Type t : getBounds(ib)) {
2063 uv2.addBound(ib, t, types, true);
2064 }
2065 }
2066 uv2.inst = inst;
2067 uv2.listener = listener;
2068 uv2.incorporationActions = new ArrayDeque<>();
2069 for (IncorporationAction action : incorporationActions) {
2070 uv2.incorporationActions.add(action.dup(uv2));
2071 }
2072 uv2.kind = kind;
2073 }
2074
2075 @Override
2076 public UndetVar cloneWithMetadata(TypeMetadata md) {
2077 throw new AssertionError("Cannot add metadata to an UndetVar type");
2078 }
2079
2080 @Override
2081 public boolean isPartial() {
2082 return true;
2083 }
2084
2085 @Override
2086 public Type baseType() {
2087 return (inst == null) ? this : inst.baseType();
2088 }
2089
2090 public Type getInst() {
2091 return inst;
2092 }
2093
2094 public void setInst(Type inst) {
2095 this.inst = inst;
2096 if (listener != null) {
2097 listener.varInstantiated(this);
2098 }
2099 }
2100
2101 /** get all bounds of a given kind */
2102 public List<Type> getBounds(InferenceBound... ibs) {
2103 ListBuffer<Type> buf = new ListBuffer<>();
2104 for (InferenceBound ib : ibs) {
2105 buf.appendList(bounds.get(ib));
2106 }
2107 return buf.toList();
2108 }
2109
2110 /** get the list of declared (upper) bounds */
2111 public List<Type> getDeclaredBounds() {
2112 ListBuffer<Type> buf = new ListBuffer<>();
2113 int count = 0;
2114 for (Type b : getBounds(InferenceBound.UPPER)) {
2115 if (count++ == declaredCount) break;
2116 buf.append(b);
2117 }
2118 return buf.toList();
2119 }
2120
2121 /** internal method used to override an undetvar bounds */
2122 public void setBounds(InferenceBound ib, List<Type> newBounds) {
2123 bounds.put(ib, newBounds);
2124 }
2125
2126 /** add a bound of a given kind - this might trigger listener notification */
2127 public final void addBound(InferenceBound ib, Type bound, Types types) {
2128 addBound(ib, bound, types, false);
2129 }
2130
2131 @SuppressWarnings("fallthrough")
2132 private void addBound(InferenceBound ib, Type bound, Types types, boolean update) {
2133 if (kind == Kind.CAPTURED && !update) {
2134 //Captured inference variables bounds must not be updated during incorporation,
2135 //except when some inference variable (beta) has been instantiated in the
2136 //right-hand-side of a 'C<alpha> = capture(C<? extends/super beta>) constraint.
2137 if (bound.hasTag(UNDETVAR) && !((UndetVar)bound).isCaptured()) {
2138 //If the new incoming bound is itself a (regular) inference variable,
2139 //then we are allowed to propagate this inference variable bounds to it.
2140 ((UndetVar)bound).addBound(ib.complement(), this, types, false);
2141 }
2142 } else {
2143 Type bound2 = bound.map(toTypeVarMap).baseType();
2144 List<Type> prevBounds = bounds.get(ib);
2145 if (bound == qtype) return;
2146 for (Type b : prevBounds) {
2147 //check for redundancy - do not add same bound twice
2148 if (types.isSameType(b, bound2)) return;
2149 }
2150 bounds.put(ib, prevBounds.prepend(bound2));
2151 notifyBoundChange(ib, bound2, false);
2152 }
2153 }
2154 //where
2155 TypeMapping<Void> toTypeVarMap = new StructuralTypeMapping<Void>() {
2156 @Override
2157 public Type visitUndetVar(UndetVar uv, Void _unused) {
2158 return uv.inst != null ? uv.inst : uv.qtype;
2159 }
2160 };
2161
2162 /** replace types in all bounds - this might trigger listener notification */
2163 public void substBounds(List<Type> from, List<Type> to, Types types) {
2164 final ListBuffer<Pair<InferenceBound, Type>> boundsChanged = new ListBuffer<>();
2165 UndetVarListener prevListener = listener;
2166 try {
2167 //setup new listener for keeping track of changed bounds
2168 listener = (uv, ib, t, _ignored) -> {
2169 Assert.check(uv == UndetVar.this);
2170 boundsChanged.add(new Pair<>(ib, t));
2171 };
2172 for (Map.Entry<InferenceBound, List<Type>> _entry : bounds.entrySet()) {
2173 InferenceBound ib = _entry.getKey();
2174 List<Type> prevBounds = _entry.getValue();
2175 ListBuffer<Type> newBounds = new ListBuffer<>();
2176 ListBuffer<Type> deps = new ListBuffer<>();
2177 //step 1 - re-add bounds that are not dependent on ivars
2178 for (Type t : prevBounds) {
2179 if (!t.containsAny(from)) {
2180 newBounds.append(t);
2181 } else {
2182 deps.append(t);
2183 }
2184 }
2185 //step 2 - replace bounds
2186 bounds.put(ib, newBounds.toList());
2187 //step 3 - for each dependency, add new replaced bound
2188 for (Type dep : deps) {
2189 addBound(ib, types.subst(dep, from, to), types, true);
2190 }
2191 }
2192 } finally {
2193 listener = prevListener;
2194 for (Pair<InferenceBound, Type> boundUpdate : boundsChanged) {
2195 notifyBoundChange(boundUpdate.fst, boundUpdate.snd, true);
2196 }
2197 }
2198 }
2199
2200 private void notifyBoundChange(InferenceBound ib, Type bound, boolean update) {
2201 if (listener != null) {
2202 listener.varBoundChanged(this, ib, bound, update);
2203 }
2204 }
2205
2206 public final boolean isCaptured() {
2207 return kind == Kind.CAPTURED;
2208 }
2209
2210 public final boolean isThrows() {
2211 return kind == Kind.THROWS;
2212 }
2213 }
2214
2215 /** Represents NONE.
2216 */
2217 public static class JCNoType extends Type implements NoType {
2218 public JCNoType() {
2219 // Need to use List.nil(), because JCNoType constructor
2220 // gets called in static initializers in Type, where
2221 // noAnnotations is also defined.
2222 super(null, TypeMetadata.EMPTY);
2223 }
2224
2225 @Override
2226 public JCNoType cloneWithMetadata(TypeMetadata md) {
2227 throw new AssertionError("Cannot add metadata to a JCNoType");
2228 }
2229
2230 @Override
2231 public TypeTag getTag() {
2232 return NONE;
2233 }
2234
2235 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2236 public TypeKind getKind() {
2237 return TypeKind.NONE;
2238 }
2239
2240 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2241 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2242 return v.visitNoType(this, p);
2243 }
2244
2245 @Override
2246 public boolean isCompound() { return false; }
2247 }
2248
2249 /** Represents VOID.
2250 */
2251 public static class JCVoidType extends Type implements NoType {
2252
2253 public JCVoidType() {
2254 // Void cannot be annotated
2255 super(null, TypeMetadata.EMPTY);
2256 }
2257
2258 @Override
2259 public JCVoidType cloneWithMetadata(TypeMetadata md) {
2260 throw new AssertionError("Cannot add metadata to a void type");
2261 }
2262
2263 @Override
2264 public TypeTag getTag() {
2265 return VOID;
2266 }
2267
2268 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2269 public TypeKind getKind() {
2270 return TypeKind.VOID;
2271 }
2272
2273 @Override
2274 public boolean isCompound() { return false; }
2275
2276 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2277 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2278 return v.visitNoType(this, p);
2279 }
2280
2281 @Override
2282 public boolean isPrimitiveOrVoid() {
2283 return true;
2284 }
2285 }
2286
2287 static class BottomType extends Type implements NullType {
2288 public BottomType() {
2289 // Bottom is a synthesized internal type, so it cannot be annotated
2290 super(null, TypeMetadata.EMPTY);
2291 }
2292
2293 @Override
2294 public BottomType cloneWithMetadata(TypeMetadata md) {
2295 throw new AssertionError("Cannot add metadata to a bottom type");
2296 }
2297
2298 @Override
2299 public TypeTag getTag() {
2300 return BOT;
2301 }
2302
2303 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2304 public TypeKind getKind() {
2305 return TypeKind.NULL;
2306 }
2307
2308 @Override
2309 public boolean isCompound() { return false; }
2310
2311 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2312 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2313 return v.visitNull(this, p);
2314 }
2315
2316 @Override
2317 public Type constType(Object value) {
2318 return this;
2319 }
2320
2321 @Override
2322 public String stringValue() {
2323 return "null";
2324 }
2325
2326 @Override
2327 public boolean isNullOrReference() {
2328 return true;
2329 }
2330
2331 }
2332
2333 public static class ErrorType extends ClassType
2334 implements javax.lang.model.type.ErrorType {
2335
2336 private Type originalType = null;
2337
2338 public ErrorType(ClassSymbol c, Type originalType) {
2339 this(originalType, c);
2340 c.type = this;
2341 c.kind = ERR;
2342 c.members_field = new Scope.ErrorScope(c);
2343 }
2344
2345 public ErrorType(Type originalType, TypeSymbol tsym) {
2346 super(noType, List.nil(), null);
2347 this.tsym = tsym;
2348 this.originalType = (originalType == null ? noType : originalType);
2349 }
2350
2351 private ErrorType(Type originalType, TypeSymbol tsym,
2352 TypeMetadata metadata) {
2353 super(noType, List.nil(), null, metadata);
2354 this.tsym = tsym;
2355 this.originalType = (originalType == null ? noType : originalType);
2356 }
2357
2358 @Override
2359 public ErrorType cloneWithMetadata(TypeMetadata md) {
2360 return new ErrorType(originalType, tsym, md) {
2361 @Override
2362 public Type baseType() { return ErrorType.this.baseType(); }
2363 };
2364 }
2365
2366 @Override
2367 public TypeTag getTag() {
2368 return ERROR;
2369 }
2370
2371 @Override
2372 public boolean isPartial() {
2373 return true;
2374 }
2375
2376 @Override
2377 public boolean isReference() {
2378 return true;
2379 }
2380
2381 @Override
2382 public boolean isNullOrReference() {
2383 return true;
2384 }
2385
2386 public ErrorType(Name name, TypeSymbol container, Type originalType) {
2387 this(new ClassSymbol(PUBLIC|STATIC|ACYCLIC, name, null, container), originalType);
2388 }
2389
2390 @Override
2391 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
2392 return v.visitErrorType(this, s);
2393 }
2394
2395 public Type constType(Object constValue) { return this; }
2396 @DefinedBy(Api.LANGUAGE_MODEL)
2397 public Type getEnclosingType() { return Type.noType; }
2398 public Type getReturnType() { return this; }
2399 public Type asSub(Symbol sym) { return this; }
2400
2401 public boolean isGenType(Type t) { return true; }
2402 public boolean isErroneous() { return true; }
2403 public boolean isCompound() { return false; }
2404 public boolean isInterface() { return false; }
2405
2406 public List<Type> allparams() { return List.nil(); }
2407 @DefinedBy(Api.LANGUAGE_MODEL)
2408 public List<Type> getTypeArguments() { return List.nil(); }
2409
2410 @DefinedBy(Api.LANGUAGE_MODEL)
2411 public TypeKind getKind() {
2412 return TypeKind.ERROR;
2413 }
2414
2415 public Type getOriginalType() {
2416 return originalType;
2417 }
2418
2419 @DefinedBy(Api.LANGUAGE_MODEL)
2420 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2421 return v.visitError(this, p);
2422 }
2423 }
2424
2425 public static class UnknownType extends Type {
2426
2427 public UnknownType() {
2428 // Unknown is a synthesized internal type, so it cannot be
2429 // annotated.
2430 super(null, TypeMetadata.EMPTY);
2431 }
2432
2433 @Override
2434 public UnknownType cloneWithMetadata(TypeMetadata md) {
2435 throw new AssertionError("Cannot add metadata to an unknown type");
2436 }
2437
2438 @Override
2439 public TypeTag getTag() {
2440 return UNKNOWN;
2441 }
2442
2443 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2444 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2445 return v.visitUnknown(this, p);
2446 }
2447
2448 @Override
2449 public boolean isPartial() {
2450 return true;
2451 }
2452 }
2453
2454 /**
2455 * A visitor for types. A visitor is used to implement operations
2456 * (or relations) on types. Most common operations on types are
2457 * binary relations and this interface is designed for binary
2458 * relations, that is, operations of the form
2459 * Type × S → R.
2460 * <!-- In plain text: Type x S -> R -->
2461 *
2462 * @param <R> the return type of the operation implemented by this
2463 * visitor; use Void if no return type is needed.
2464 * @param <S> the type of the second argument (the first being the
2465 * type itself) of the operation implemented by this visitor; use
2466 * Void if a second argument is not needed.
2467 */
2468 public interface Visitor<R,S> {
2469 R visitClassType(ClassType t, S s);
2470 R visitWildcardType(WildcardType t, S s);
2471 R visitArrayType(ArrayType t, S s);
2472 R visitMethodType(MethodType t, S s);
2473 R visitPackageType(PackageType t, S s);
2474 R visitModuleType(ModuleType t, S s);
2475 R visitTypeVar(TypeVar t, S s);
2476 R visitCapturedType(CapturedType t, S s);
2477 R visitForAll(ForAll t, S s);
2478 R visitUndetVar(UndetVar t, S s);
2479 R visitErrorType(ErrorType t, S s);
2480 R visitType(Type t, S s);
2481 }
2482 }