1 /*
2 * Copyright (c) 1999, 2021, 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 static abstract 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 appendAnnotationsString(buf);
1042 buf.append(className(tsym, true));
1043 }
1044
1045 if (getTypeArguments().nonEmpty()) {
1046 buf.append('<');
1047 buf.append(getTypeArguments().toString());
1048 buf.append(">");
1049 }
1050 return buf.toString();
1051 }
1052 //where
1053 private String className(Symbol sym, boolean longform) {
1054 if (sym.name.isEmpty() && (sym.flags() & COMPOUND) != 0) {
1055 StringBuilder s = new StringBuilder(supertype_field.toString());
1056 for (List<Type> is=interfaces_field; is.nonEmpty(); is = is.tail) {
1057 s.append("&");
1058 s.append(is.head.toString());
1059 }
1060 return s.toString();
1061 } else if (sym.name.isEmpty()) {
1062 String s;
1063 ClassType norm = (ClassType) tsym.type;
1064 if (norm == null) {
1065 s = Log.getLocalizedString("anonymous.class", (Object)null);
1066 } else if (norm.interfaces_field != null && norm.interfaces_field.nonEmpty()) {
1067 s = Log.getLocalizedString("anonymous.class",
1068 norm.interfaces_field.head);
1069 } else {
1070 s = Log.getLocalizedString("anonymous.class",
1071 norm.supertype_field);
1072 }
1073 if (moreInfo)
1074 s += String.valueOf(sym.hashCode());
1075 return s;
1076 } else if (longform) {
1077 return sym.getQualifiedName().toString();
1078 } else {
1079 return sym.name.toString();
1080 }
1081 }
1082
1083 @DefinedBy(Api.LANGUAGE_MODEL)
1084 public List<Type> getTypeArguments() {
1085 if (typarams_field == null) {
1086 complete();
1087 if (typarams_field == null)
1088 typarams_field = List.nil();
1089 }
1090 return typarams_field;
1091 }
1092
1093 public boolean hasErasedSupertypes() {
1094 return isRaw();
1095 }
1096
1097 @DefinedBy(Api.LANGUAGE_MODEL)
1098 public Type getEnclosingType() {
1099 return outer_field;
1100 }
1101
1102 public void setEnclosingType(Type outer) {
1103 outer_field = outer;
1104 }
1105
1106 public List<Type> allparams() {
1107 if (allparams_field == null) {
1108 allparams_field = getTypeArguments().prependList(getEnclosingType().allparams());
1109 }
1110 return allparams_field;
1111 }
1112
1113 public boolean isErroneous() {
1114 return
1115 getEnclosingType().isErroneous() ||
1116 isErroneous(getTypeArguments()) ||
1117 this != tsym.type && tsym.type.isErroneous();
1118 }
1119
1120 public boolean isParameterized() {
1121 return allparams().tail != null;
1122 // optimization, was: allparams().nonEmpty();
1123 }
1124
1125 @Override
1126 public boolean isReference() {
1127 return true;
1128 }
1129
1130 @Override
1131 public boolean isNullOrReference() {
1132 return true;
1133 }
1134
1135 /** A cache for the rank. */
1136 int rank_field = -1;
1137
1138 /** A class type is raw if it misses some
1139 * of its type parameter sections.
1140 * After validation, this is equivalent to:
1141 * {@code allparams.isEmpty() && tsym.type.allparams.nonEmpty(); }
1142 */
1143 public boolean isRaw() {
1144 return
1145 this != tsym.type && // necessary, but not sufficient condition
1146 tsym.type.allparams().nonEmpty() &&
1147 allparams().isEmpty();
1148 }
1149
1150 public boolean contains(Type elem) {
1151 return
1152 elem.equalsIgnoreMetadata(this)
1153 || (isParameterized()
1154 && (getEnclosingType().contains(elem) || contains(getTypeArguments(), elem)))
1155 || (isCompound()
1156 && (supertype_field.contains(elem) || contains(interfaces_field, elem)));
1157 }
1158
1159 public void complete() {
1160 tsym.complete();
1161 }
1162
1163 @DefinedBy(Api.LANGUAGE_MODEL)
1164 public TypeKind getKind() {
1165 tsym.apiComplete();
1166 return tsym.kind == TYP ? TypeKind.DECLARED : TypeKind.ERROR;
1167 }
1168
1169 @DefinedBy(Api.LANGUAGE_MODEL)
1170 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1171 return v.visitDeclared(this, p);
1172 }
1173 }
1174
1175 public static class ErasedClassType extends ClassType {
1176 public ErasedClassType(Type outer, TypeSymbol tsym,
1177 TypeMetadata metadata) {
1178 super(outer, List.nil(), tsym, metadata);
1179 }
1180
1181 @Override
1182 public boolean hasErasedSupertypes() {
1183 return true;
1184 }
1185 }
1186
1187 // a clone of a ClassType that knows about the alternatives of a union type.
1188 public static class UnionClassType extends ClassType implements UnionType {
1189 final List<? extends Type> alternatives_field;
1190
1191 public UnionClassType(ClassType ct, List<? extends Type> alternatives) {
1192 // Presently no way to refer to this type directly, so we
1193 // cannot put annotations directly on it.
1194 super(ct.outer_field, ct.typarams_field, ct.tsym);
1195 allparams_field = ct.allparams_field;
1196 supertype_field = ct.supertype_field;
1197 interfaces_field = ct.interfaces_field;
1198 all_interfaces_field = ct.interfaces_field;
1199 alternatives_field = alternatives;
1200 }
1201
1202 @Override
1203 public UnionClassType cloneWithMetadata(TypeMetadata md) {
1204 throw new AssertionError("Cannot add metadata to a union type");
1205 }
1206
1207 public Type getLub() {
1208 return tsym.type;
1209 }
1210
1211 @DefinedBy(Api.LANGUAGE_MODEL)
1212 public java.util.List<? extends TypeMirror> getAlternatives() {
1213 return Collections.unmodifiableList(alternatives_field);
1214 }
1215
1216 @Override
1217 public boolean isUnion() {
1218 return true;
1219 }
1220
1221 @Override
1222 public boolean isCompound() {
1223 return getLub().isCompound();
1224 }
1225
1226 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1227 public TypeKind getKind() {
1228 return TypeKind.UNION;
1229 }
1230
1231 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1232 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1233 return v.visitUnion(this, p);
1234 }
1235
1236 public Iterable<? extends Type> getAlternativeTypes() {
1237 return alternatives_field;
1238 }
1239 }
1240
1241 // a clone of a ClassType that knows about the bounds of an intersection type.
1242 public static class IntersectionClassType extends ClassType implements IntersectionType {
1243
1244 public boolean allInterfaces;
1245
1246 public IntersectionClassType(List<Type> bounds, ClassSymbol csym, boolean allInterfaces) {
1247 // Presently no way to refer to this type directly, so we
1248 // cannot put annotations directly on it.
1249 super(Type.noType, List.nil(), csym);
1250 this.allInterfaces = allInterfaces;
1251 Assert.check((csym.flags() & COMPOUND) != 0);
1252 supertype_field = bounds.head;
1253 interfaces_field = bounds.tail;
1254 Assert.check(!supertype_field.tsym.isCompleted() ||
1255 !supertype_field.isInterface(), supertype_field);
1256 }
1257
1258 @Override
1259 public IntersectionClassType cloneWithMetadata(TypeMetadata md) {
1260 throw new AssertionError("Cannot add metadata to an intersection type");
1261 }
1262
1263 @DefinedBy(Api.LANGUAGE_MODEL)
1264 public java.util.List<? extends TypeMirror> getBounds() {
1265 return Collections.unmodifiableList(getExplicitComponents());
1266 }
1267
1268 @Override
1269 public boolean isCompound() {
1270 return true;
1271 }
1272
1273 public List<Type> getComponents() {
1274 return interfaces_field.prepend(supertype_field);
1275 }
1276
1277 @Override
1278 public boolean isIntersection() {
1279 return true;
1280 }
1281
1282 public List<Type> getExplicitComponents() {
1283 return allInterfaces ?
1284 interfaces_field :
1285 getComponents();
1286 }
1287
1288 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1289 public TypeKind getKind() {
1290 return TypeKind.INTERSECTION;
1291 }
1292
1293 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1294 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1295 return v.visitIntersection(this, p);
1296 }
1297 }
1298
1299 public static class ArrayType extends Type
1300 implements LoadableConstant, javax.lang.model.type.ArrayType {
1301
1302 public Type elemtype;
1303
1304 public ArrayType(Type elemtype, TypeSymbol arrayClass) {
1305 this(elemtype, arrayClass, TypeMetadata.EMPTY);
1306 }
1307
1308 public ArrayType(Type elemtype, TypeSymbol arrayClass,
1309 TypeMetadata metadata) {
1310 super(arrayClass, metadata);
1311 this.elemtype = elemtype;
1312 }
1313
1314 public ArrayType(ArrayType that) {
1315 //note: type metadata is deliberately shared here, as we want side-effects from annotation
1316 //processing to flow from original array to the cloned array.
1317 this(that.elemtype, that.tsym, that.getMetadata());
1318 }
1319
1320 public int poolTag() {
1321 return ClassFile.CONSTANT_Class;
1322 }
1323
1324 @Override
1325 public ArrayType cloneWithMetadata(TypeMetadata md) {
1326 return new ArrayType(elemtype, tsym, md) {
1327 @Override
1328 public Type baseType() { return ArrayType.this.baseType(); }
1329 };
1330 }
1331
1332 @Override
1333 public TypeTag getTag() {
1334 return ARRAY;
1335 }
1336
1337 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1338 return v.visitArrayType(this, s);
1339 }
1340
1341 @DefinedBy(Api.LANGUAGE_MODEL)
1342 public String toString() {
1343 StringBuilder sb = new StringBuilder();
1344
1345 // First append root component type
1346 Type t = elemtype;
1347 while (t.getKind() == TypeKind.ARRAY)
1348 t = ((ArrayType) t).getComponentType();
1349 sb.append(t);
1350
1351 // then append @Anno[] @Anno[] ... @Anno[]
1352 t = this;
1353 do {
1354 t.appendAnnotationsString(sb, true);
1355 sb.append("[]");
1356 t = ((ArrayType) t).getComponentType();
1357 } while (t.getKind() == TypeKind.ARRAY);
1358
1359 return sb.toString();
1360 }
1361
1362 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1363 public boolean equals(Object obj) {
1364 return (obj instanceof ArrayType arrayType)
1365 && (this == arrayType || elemtype.equals(arrayType.elemtype));
1366 }
1367
1368 @DefinedBy(Api.LANGUAGE_MODEL)
1369 public int hashCode() {
1370 return (ARRAY.ordinal() << 5) + elemtype.hashCode();
1371 }
1372
1373 public boolean isVarargs() {
1374 return false;
1375 }
1376
1377 public List<Type> allparams() { return elemtype.allparams(); }
1378
1379 public boolean isErroneous() {
1380 return elemtype.isErroneous();
1381 }
1382
1383 public boolean isParameterized() {
1384 return elemtype.isParameterized();
1385 }
1386
1387 @Override
1388 public boolean isReference() {
1389 return true;
1390 }
1391
1392 @Override
1393 public boolean isNullOrReference() {
1394 return true;
1395 }
1396
1397 public boolean isRaw() {
1398 return elemtype.isRaw();
1399 }
1400
1401 public ArrayType makeVarargs() {
1402 return new ArrayType(elemtype, tsym, metadata) {
1403 @Override
1404 public boolean isVarargs() {
1405 return true;
1406 }
1407 };
1408 }
1409
1410 public boolean contains(Type elem) {
1411 return elem.equalsIgnoreMetadata(this) || elemtype.contains(elem);
1412 }
1413
1414 public void complete() {
1415 elemtype.complete();
1416 }
1417
1418 @DefinedBy(Api.LANGUAGE_MODEL)
1419 public Type getComponentType() {
1420 return elemtype;
1421 }
1422
1423 @DefinedBy(Api.LANGUAGE_MODEL)
1424 public TypeKind getKind() {
1425 return TypeKind.ARRAY;
1426 }
1427
1428 @DefinedBy(Api.LANGUAGE_MODEL)
1429 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1430 return v.visitArray(this, p);
1431 }
1432 }
1433
1434 public static class MethodType extends Type implements ExecutableType, LoadableConstant {
1435
1436 public List<Type> argtypes;
1437 public Type restype;
1438 public List<Type> thrown;
1439
1440 /** The type annotations on the method receiver.
1441 */
1442 public Type recvtype;
1443
1444 public MethodType(List<Type> argtypes,
1445 Type restype,
1446 List<Type> thrown,
1447 TypeSymbol methodClass) {
1448 // Presently no way to refer to a method type directly, so
1449 // we cannot put type annotations on it.
1450 super(methodClass, TypeMetadata.EMPTY);
1451 this.argtypes = argtypes;
1452 this.restype = restype;
1453 this.thrown = thrown;
1454 }
1455
1456 @Override
1457 public MethodType cloneWithMetadata(TypeMetadata md) {
1458 throw new AssertionError("Cannot add metadata to a method type");
1459 }
1460
1461 @Override
1462 public TypeTag getTag() {
1463 return METHOD;
1464 }
1465
1466 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1467 return v.visitMethodType(this, s);
1468 }
1469
1470 /** The Java source which this type represents.
1471 *
1472 * XXX 06/09/99 iris This isn't correct Java syntax, but it probably
1473 * should be.
1474 */
1475 @DefinedBy(Api.LANGUAGE_MODEL)
1476 public String toString() {
1477 StringBuilder sb = new StringBuilder();
1478 appendAnnotationsString(sb);
1479 sb.append('(');
1480 sb.append(argtypes);
1481 sb.append(')');
1482 sb.append(restype);
1483 return sb.toString();
1484 }
1485
1486 @DefinedBy(Api.LANGUAGE_MODEL)
1487 public List<Type> getParameterTypes() { return argtypes; }
1488 @DefinedBy(Api.LANGUAGE_MODEL)
1489 public Type getReturnType() { return restype; }
1490 @DefinedBy(Api.LANGUAGE_MODEL)
1491 public Type getReceiverType() {
1492 return (recvtype == null) ? Type.noType : recvtype;
1493 }
1494 @DefinedBy(Api.LANGUAGE_MODEL)
1495 public List<Type> getThrownTypes() { return thrown; }
1496
1497 public boolean isErroneous() {
1498 return
1499 isErroneous(argtypes) ||
1500 restype != null && restype.isErroneous();
1501 }
1502
1503 @Override
1504 public int poolTag() {
1505 return ClassFile.CONSTANT_MethodType;
1506 }
1507
1508 public boolean contains(Type elem) {
1509 return elem.equalsIgnoreMetadata(this) || contains(argtypes, elem) || restype.contains(elem) || contains(thrown, elem);
1510 }
1511
1512 public MethodType asMethodType() { return this; }
1513
1514 public void complete() {
1515 for (List<Type> l = argtypes; l.nonEmpty(); l = l.tail)
1516 l.head.complete();
1517 restype.complete();
1518 recvtype.complete();
1519 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1520 l.head.complete();
1521 }
1522
1523 @DefinedBy(Api.LANGUAGE_MODEL)
1524 public List<TypeVar> getTypeVariables() {
1525 return List.nil();
1526 }
1527
1528 public TypeSymbol asElement() {
1529 return null;
1530 }
1531
1532 @DefinedBy(Api.LANGUAGE_MODEL)
1533 public TypeKind getKind() {
1534 return TypeKind.EXECUTABLE;
1535 }
1536
1537 @DefinedBy(Api.LANGUAGE_MODEL)
1538 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1539 return v.visitExecutable(this, p);
1540 }
1541 }
1542
1543 public static class PackageType extends Type implements NoType {
1544
1545 PackageType(PackageSymbol tsym) {
1546 // Package types cannot be annotated
1547 super(tsym, TypeMetadata.EMPTY);
1548 }
1549
1550 @Override
1551 public PackageType cloneWithMetadata(TypeMetadata md) {
1552 throw new AssertionError("Cannot add metadata to a package type");
1553 }
1554
1555 @Override
1556 public TypeTag getTag() {
1557 return PACKAGE;
1558 }
1559
1560 @Override
1561 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1562 return v.visitPackageType(this, s);
1563 }
1564
1565 @DefinedBy(Api.LANGUAGE_MODEL)
1566 public String toString() {
1567 return tsym.getQualifiedName().toString();
1568 }
1569
1570 @DefinedBy(Api.LANGUAGE_MODEL)
1571 public TypeKind getKind() {
1572 return TypeKind.PACKAGE;
1573 }
1574
1575 @DefinedBy(Api.LANGUAGE_MODEL)
1576 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1577 return v.visitNoType(this, p);
1578 }
1579 }
1580
1581 public static class ModuleType extends Type implements NoType {
1582
1583 ModuleType(ModuleSymbol tsym) {
1584 // Module types cannot be annotated
1585 super(tsym, TypeMetadata.EMPTY);
1586 }
1587
1588 @Override
1589 public ModuleType cloneWithMetadata(TypeMetadata md) {
1590 throw new AssertionError("Cannot add metadata to a module type");
1591 }
1592
1593 @Override
1594 public ModuleType annotatedType(List<Attribute.TypeCompound> annos) {
1595 throw new AssertionError("Cannot annotate a module type");
1596 }
1597
1598 @Override
1599 public TypeTag getTag() {
1600 return TypeTag.MODULE;
1601 }
1602
1603 @Override
1604 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1605 return v.visitModuleType(this, s);
1606 }
1607
1608 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1609 public String toString() {
1610 return tsym.getQualifiedName().toString();
1611 }
1612
1613 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1614 public TypeKind getKind() {
1615 return TypeKind.MODULE;
1616 }
1617
1618 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1619 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1620 return v.visitNoType(this, p);
1621 }
1622 }
1623
1624 public static class TypeVar extends Type implements TypeVariable {
1625
1626 /** The upper bound of this type variable; set from outside.
1627 * Must be nonempty once it is set.
1628 * For a bound, `bound' is the bound type itself.
1629 * Multiple bounds are expressed as a single class type which has the
1630 * individual bounds as superclass, respectively interfaces.
1631 * The class type then has as `tsym' a compiler generated class `c',
1632 * which has a flag COMPOUND and whose owner is the type variable
1633 * itself. Furthermore, the erasure_field of the class
1634 * points to the first class or interface bound.
1635 */
1636 private Type _bound = null;
1637
1638 /** The lower bound of this type variable.
1639 * TypeVars don't normally have a lower bound, so it is normally set
1640 * to syms.botType.
1641 * Subtypes, such as CapturedType, may provide a different value.
1642 */
1643 public Type lower;
1644
1645 public TypeVar(Name name, Symbol owner, Type lower) {
1646 super(null, TypeMetadata.EMPTY);
1647 Assert.checkNonNull(lower);
1648 tsym = new TypeVariableSymbol(0, name, this, owner);
1649 this.setUpperBound(null);
1650 this.lower = lower;
1651 }
1652
1653 public TypeVar(TypeSymbol tsym, Type bound, Type lower) {
1654 this(tsym, bound, lower, TypeMetadata.EMPTY);
1655 }
1656
1657 public TypeVar(TypeSymbol tsym, Type bound, Type lower,
1658 TypeMetadata metadata) {
1659 super(tsym, metadata);
1660 Assert.checkNonNull(lower);
1661 this.setUpperBound(bound);
1662 this.lower = lower;
1663 }
1664
1665 @Override
1666 public TypeVar cloneWithMetadata(TypeMetadata md) {
1667 return new TypeVar(tsym, getUpperBound(), lower, md) {
1668 @Override
1669 public Type baseType() { return TypeVar.this.baseType(); }
1670
1671 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1672 public Type getUpperBound() { return TypeVar.this.getUpperBound(); }
1673
1674 public void setUpperBound(Type bound) { TypeVar.this.setUpperBound(bound); }
1675 };
1676 }
1677
1678 @Override
1679 public TypeTag getTag() {
1680 return TYPEVAR;
1681 }
1682
1683 @Override
1684 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1685 return v.visitTypeVar(this, s);
1686 }
1687
1688 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1689 public Type getUpperBound() { return _bound; }
1690
1691 public void setUpperBound(Type bound) { this._bound = bound; }
1692
1693 int rank_field = -1;
1694
1695 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1696 public Type getLowerBound() {
1697 return lower;
1698 }
1699
1700 @DefinedBy(Api.LANGUAGE_MODEL)
1701 public TypeKind getKind() {
1702 return TypeKind.TYPEVAR;
1703 }
1704
1705 public boolean isCaptured() {
1706 return false;
1707 }
1708
1709 @Override
1710 public boolean isReference() {
1711 return true;
1712 }
1713
1714 @Override
1715 public boolean isNullOrReference() {
1716 return true;
1717 }
1718
1719 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1720 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1721 return v.visitTypeVariable(this, p);
1722 }
1723 }
1724
1725 /** A captured type variable comes from wildcards which can have
1726 * both upper and lower bound. CapturedType extends TypeVar with
1727 * a lower bound.
1728 */
1729 public static class CapturedType extends TypeVar {
1730
1731 public WildcardType wildcard;
1732
1733 public CapturedType(Name name,
1734 Symbol owner,
1735 Type upper,
1736 Type lower,
1737 WildcardType wildcard) {
1738 super(name, owner, lower);
1739 this.lower = Assert.checkNonNull(lower);
1740 this.setUpperBound(upper);
1741 this.wildcard = wildcard;
1742 }
1743
1744 public CapturedType(TypeSymbol tsym,
1745 Type bound,
1746 Type upper,
1747 Type lower,
1748 WildcardType wildcard,
1749 TypeMetadata metadata) {
1750 super(tsym, bound, lower, metadata);
1751 this.wildcard = wildcard;
1752 }
1753
1754 @Override
1755 public CapturedType cloneWithMetadata(TypeMetadata md) {
1756 return new CapturedType(tsym, getUpperBound(), getUpperBound(), lower, wildcard, md) {
1757 @Override
1758 public Type baseType() { return CapturedType.this.baseType(); }
1759
1760 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1761 public Type getUpperBound() { return CapturedType.this.getUpperBound(); }
1762
1763 public void setUpperBound(Type bound) { CapturedType.this.setUpperBound(bound); }
1764 };
1765 }
1766
1767 @Override
1768 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1769 return v.visitCapturedType(this, s);
1770 }
1771
1772 @Override
1773 public boolean isCaptured() {
1774 return true;
1775 }
1776
1777 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1778 public String toString() {
1779 StringBuilder sb = new StringBuilder();
1780 appendAnnotationsString(sb);
1781 sb.append("capture#");
1782 sb.append((hashCode() & 0xFFFFFFFFL) % Printer.PRIME);
1783 sb.append(" of ");
1784 sb.append(wildcard);
1785 return sb.toString();
1786 }
1787 }
1788
1789 public static abstract class DelegatedType extends Type {
1790 public Type qtype;
1791 public TypeTag tag;
1792
1793 public DelegatedType(TypeTag tag, Type qtype) {
1794 this(tag, qtype, TypeMetadata.EMPTY);
1795 }
1796
1797 public DelegatedType(TypeTag tag, Type qtype,
1798 TypeMetadata metadata) {
1799 super(qtype.tsym, metadata);
1800 this.tag = tag;
1801 this.qtype = qtype;
1802 }
1803
1804 public TypeTag getTag() { return tag; }
1805 @DefinedBy(Api.LANGUAGE_MODEL)
1806 public String toString() { return qtype.toString(); }
1807 public List<Type> getTypeArguments() { return qtype.getTypeArguments(); }
1808 public Type getEnclosingType() { return qtype.getEnclosingType(); }
1809 public List<Type> getParameterTypes() { return qtype.getParameterTypes(); }
1810 public Type getReturnType() { return qtype.getReturnType(); }
1811 public Type getReceiverType() { return qtype.getReceiverType(); }
1812 public List<Type> getThrownTypes() { return qtype.getThrownTypes(); }
1813 public List<Type> allparams() { return qtype.allparams(); }
1814 public Type getUpperBound() { return qtype.getUpperBound(); }
1815 public boolean isErroneous() { return qtype.isErroneous(); }
1816 }
1817
1818 /**
1819 * The type of a generic method type. It consists of a method type and
1820 * a list of method type-parameters that are used within the method
1821 * type.
1822 */
1823 public static class ForAll extends DelegatedType implements ExecutableType {
1824 public List<Type> tvars;
1825
1826 public ForAll(List<Type> tvars, Type qtype) {
1827 super(FORALL, (MethodType)qtype);
1828 this.tvars = tvars;
1829 }
1830
1831 @Override
1832 public ForAll cloneWithMetadata(TypeMetadata md) {
1833 throw new AssertionError("Cannot add metadata to a forall type");
1834 }
1835
1836 @Override
1837 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1838 return v.visitForAll(this, s);
1839 }
1840
1841 @DefinedBy(Api.LANGUAGE_MODEL)
1842 public String toString() {
1843 StringBuilder sb = new StringBuilder();
1844 appendAnnotationsString(sb);
1845 sb.append('<');
1846 sb.append(tvars);
1847 sb.append('>');
1848 sb.append(qtype);
1849 return sb.toString();
1850 }
1851
1852 public List<Type> getTypeArguments() { return tvars; }
1853
1854 public boolean isErroneous() {
1855 return qtype.isErroneous();
1856 }
1857
1858 public boolean contains(Type elem) {
1859 return qtype.contains(elem);
1860 }
1861
1862 public MethodType asMethodType() {
1863 return (MethodType)qtype;
1864 }
1865
1866 public void complete() {
1867 for (List<Type> l = tvars; l.nonEmpty(); l = l.tail) {
1868 ((TypeVar)l.head).getUpperBound().complete();
1869 }
1870 qtype.complete();
1871 }
1872
1873 @DefinedBy(Api.LANGUAGE_MODEL)
1874 public List<TypeVar> getTypeVariables() {
1875 return List.convert(TypeVar.class, getTypeArguments());
1876 }
1877
1878 @DefinedBy(Api.LANGUAGE_MODEL)
1879 public TypeKind getKind() {
1880 return TypeKind.EXECUTABLE;
1881 }
1882
1883 @DefinedBy(Api.LANGUAGE_MODEL)
1884 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1885 return v.visitExecutable(this, p);
1886 }
1887 }
1888
1889 /** A class for inference variables, for use during method/diamond type
1890 * inference. An inference variable has upper/lower bounds and a set
1891 * of equality constraints. Such bounds are set during subtyping, type-containment,
1892 * type-equality checks, when the types being tested contain inference variables.
1893 * A change listener can be attached to an inference variable, to receive notifications
1894 * whenever the bounds of an inference variable change.
1895 */
1896 public static class UndetVar extends DelegatedType {
1897
1898 enum Kind {
1899 NORMAL,
1900 CAPTURED,
1901 THROWS;
1902 }
1903
1904 /** Inference variable change listener. The listener method is called
1905 * whenever a change to the inference variable's bounds occurs
1906 */
1907 public interface UndetVarListener {
1908 /** called when some inference variable bounds (of given kinds ibs) change */
1909 void varBoundChanged(UndetVar uv, InferenceBound ib, Type bound, boolean update);
1910 /** called when the inferred type is set on some inference variable */
1911 default void varInstantiated(UndetVar uv) { Assert.error(); }
1912 }
1913
1914 /**
1915 * Inference variable bound kinds
1916 */
1917 public enum InferenceBound {
1918 /** lower bounds */
1919 LOWER {
1920 public InferenceBound complement() { return UPPER; }
1921 },
1922 /** equality constraints */
1923 EQ {
1924 public InferenceBound complement() { return EQ; }
1925 },
1926 /** upper bounds */
1927 UPPER {
1928 public InferenceBound complement() { return LOWER; }
1929 };
1930
1931 public abstract InferenceBound complement();
1932
1933 public boolean lessThan(InferenceBound that) {
1934 if (that == this) {
1935 return false;
1936 } else {
1937 switch (that) {
1938 case UPPER: return true;
1939 case LOWER: return false;
1940 case EQ: return (this != UPPER);
1941 default:
1942 Assert.error("Cannot get here!");
1943 return false;
1944 }
1945 }
1946 }
1947 }
1948
1949 /** list of incorporation actions (used by the incorporation engine). */
1950 public ArrayDeque<IncorporationAction> incorporationActions = new ArrayDeque<>();
1951
1952 /** inference variable bounds */
1953 protected Map<InferenceBound, List<Type>> bounds;
1954
1955 /** inference variable's inferred type (set from Infer.java) */
1956 private Type inst = null;
1957
1958 /** number of declared (upper) bounds */
1959 public int declaredCount;
1960
1961 /** inference variable's change listener */
1962 public UndetVarListener listener = null;
1963
1964 Kind kind;
1965
1966 @Override
1967 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1968 return v.visitUndetVar(this, s);
1969 }
1970
1971 public UndetVar(TypeVar origin, UndetVarListener listener, Types types) {
1972 // This is a synthesized internal type, so we cannot annotate it.
1973 super(UNDETVAR, origin);
1974 this.kind = origin.isCaptured() ?
1975 Kind.CAPTURED :
1976 Kind.NORMAL;
1977 this.listener = listener;
1978 bounds = new EnumMap<>(InferenceBound.class);
1979 List<Type> declaredBounds = types.getBounds(origin);
1980 declaredCount = declaredBounds.length();
1981 bounds.put(InferenceBound.UPPER, List.nil());
1982 bounds.put(InferenceBound.LOWER, List.nil());
1983 bounds.put(InferenceBound.EQ, List.nil());
1984 for (Type t : declaredBounds.reverse()) {
1985 //add bound works in reverse order
1986 addBound(InferenceBound.UPPER, t, types, true);
1987 }
1988 if (origin.isCaptured() && !origin.lower.hasTag(BOT)) {
1989 //add lower bound if needed
1990 addBound(InferenceBound.LOWER, origin.lower, types, true);
1991 }
1992 }
1993
1994 @DefinedBy(Api.LANGUAGE_MODEL)
1995 public String toString() {
1996 StringBuilder sb = new StringBuilder();
1997 appendAnnotationsString(sb);
1998 if (inst == null) {
1999 sb.append(qtype);
2000 sb.append('?');
2001 } else {
2002 sb.append(inst);
2003 }
2004 return sb.toString();
2005 }
2006
2007 public String debugString() {
2008 String result = "inference var = " + qtype + "\n";
2009 if (inst != null) {
2010 result += "inst = " + inst + '\n';
2011 }
2012 for (InferenceBound bound: InferenceBound.values()) {
2013 List<Type> aboundList = bounds.get(bound);
2014 if (aboundList != null && aboundList.size() > 0) {
2015 result += bound + " = " + aboundList + '\n';
2016 }
2017 }
2018 return result;
2019 }
2020
2021 public void setThrow() {
2022 if (this.kind == Kind.CAPTURED) {
2023 //invalid state transition
2024 throw new IllegalStateException();
2025 }
2026 this.kind = Kind.THROWS;
2027 }
2028
2029 /**
2030 * Returns a new copy of this undet var.
2031 */
2032 public UndetVar dup(Types types) {
2033 UndetVar uv2 = new UndetVar((TypeVar)qtype, listener, types);
2034 dupTo(uv2, types);
2035 return uv2;
2036 }
2037
2038 /**
2039 * Dumps the contents of this undet var on another undet var.
2040 */
2041 public void dupTo(UndetVar uv2, Types types) {
2042 uv2.listener = null;
2043 uv2.bounds.clear();
2044 for (InferenceBound ib : InferenceBound.values()) {
2045 uv2.bounds.put(ib, List.nil());
2046 for (Type t : getBounds(ib)) {
2047 uv2.addBound(ib, t, types, true);
2048 }
2049 }
2050 uv2.inst = inst;
2051 uv2.listener = listener;
2052 uv2.incorporationActions = new ArrayDeque<>();
2053 for (IncorporationAction action : incorporationActions) {
2054 uv2.incorporationActions.add(action.dup(uv2));
2055 }
2056 uv2.kind = kind;
2057 }
2058
2059 @Override
2060 public UndetVar cloneWithMetadata(TypeMetadata md) {
2061 throw new AssertionError("Cannot add metadata to an UndetVar type");
2062 }
2063
2064 @Override
2065 public boolean isPartial() {
2066 return true;
2067 }
2068
2069 @Override
2070 public Type baseType() {
2071 return (inst == null) ? this : inst.baseType();
2072 }
2073
2074 public Type getInst() {
2075 return inst;
2076 }
2077
2078 public void setInst(Type inst) {
2079 this.inst = inst;
2080 if (listener != null) {
2081 listener.varInstantiated(this);
2082 }
2083 }
2084
2085 /** get all bounds of a given kind */
2086 public List<Type> getBounds(InferenceBound... ibs) {
2087 ListBuffer<Type> buf = new ListBuffer<>();
2088 for (InferenceBound ib : ibs) {
2089 buf.appendList(bounds.get(ib));
2090 }
2091 return buf.toList();
2092 }
2093
2094 /** get the list of declared (upper) bounds */
2095 public List<Type> getDeclaredBounds() {
2096 ListBuffer<Type> buf = new ListBuffer<>();
2097 int count = 0;
2098 for (Type b : getBounds(InferenceBound.UPPER)) {
2099 if (count++ == declaredCount) break;
2100 buf.append(b);
2101 }
2102 return buf.toList();
2103 }
2104
2105 /** internal method used to override an undetvar bounds */
2106 public void setBounds(InferenceBound ib, List<Type> newBounds) {
2107 bounds.put(ib, newBounds);
2108 }
2109
2110 /** add a bound of a given kind - this might trigger listener notification */
2111 public final void addBound(InferenceBound ib, Type bound, Types types) {
2112 // Per JDK-8075793: in pre-8 sources, follow legacy javac behavior
2113 // when capture variables are inferred as bounds: for lower bounds,
2114 // map to the capture variable's upper bound; for upper bounds,
2115 // if the capture variable has a lower bound, map to that type
2116 if (types.mapCapturesToBounds) {
2117 switch (ib) {
2118 case LOWER:
2119 bound = types.cvarUpperBound(bound);
2120 break;
2121 case UPPER:
2122 Type altBound = types.cvarLowerBound(bound);
2123 if (!altBound.hasTag(TypeTag.BOT)) bound = altBound;
2124 break;
2125 }
2126 }
2127 addBound(ib, bound, types, false);
2128 }
2129
2130 @SuppressWarnings("fallthrough")
2131 private void addBound(InferenceBound ib, Type bound, Types types, boolean update) {
2132 if (kind == Kind.CAPTURED && !update) {
2133 //Captured inference variables bounds must not be updated during incorporation,
2134 //except when some inference variable (beta) has been instantiated in the
2135 //right-hand-side of a 'C<alpha> = capture(C<? extends/super beta>) constraint.
2136 if (bound.hasTag(UNDETVAR) && !((UndetVar)bound).isCaptured()) {
2137 //If the new incoming bound is itself a (regular) inference variable,
2138 //then we are allowed to propagate this inference variable bounds to it.
2139 ((UndetVar)bound).addBound(ib.complement(), this, types, false);
2140 }
2141 } else {
2142 Type bound2 = bound.map(toTypeVarMap).baseType();
2143 List<Type> prevBounds = bounds.get(ib);
2144 if (bound == qtype) return;
2145 for (Type b : prevBounds) {
2146 //check for redundancy - do not add same bound twice
2147 if (types.isSameType(b, bound2)) return;
2148 }
2149 bounds.put(ib, prevBounds.prepend(bound2));
2150 notifyBoundChange(ib, bound2, false);
2151 }
2152 }
2153 //where
2154 TypeMapping<Void> toTypeVarMap = new StructuralTypeMapping<Void>() {
2155 @Override
2156 public Type visitUndetVar(UndetVar uv, Void _unused) {
2157 return uv.inst != null ? uv.inst : uv.qtype;
2158 }
2159 };
2160
2161 /** replace types in all bounds - this might trigger listener notification */
2162 public void substBounds(List<Type> from, List<Type> to, Types types) {
2163 final ListBuffer<Pair<InferenceBound, Type>> boundsChanged = new ListBuffer<>();
2164 UndetVarListener prevListener = listener;
2165 try {
2166 //setup new listener for keeping track of changed bounds
2167 listener = (uv, ib, t, _ignored) -> {
2168 Assert.check(uv == UndetVar.this);
2169 boundsChanged.add(new Pair<>(ib, t));
2170 };
2171 for (Map.Entry<InferenceBound, List<Type>> _entry : bounds.entrySet()) {
2172 InferenceBound ib = _entry.getKey();
2173 List<Type> prevBounds = _entry.getValue();
2174 ListBuffer<Type> newBounds = new ListBuffer<>();
2175 ListBuffer<Type> deps = new ListBuffer<>();
2176 //step 1 - re-add bounds that are not dependent on ivars
2177 for (Type t : prevBounds) {
2178 if (!t.containsAny(from)) {
2179 newBounds.append(t);
2180 } else {
2181 deps.append(t);
2182 }
2183 }
2184 //step 2 - replace bounds
2185 bounds.put(ib, newBounds.toList());
2186 //step 3 - for each dependency, add new replaced bound
2187 for (Type dep : deps) {
2188 addBound(ib, types.subst(dep, from, to), types, true);
2189 }
2190 }
2191 } finally {
2192 listener = prevListener;
2193 for (Pair<InferenceBound, Type> boundUpdate : boundsChanged) {
2194 notifyBoundChange(boundUpdate.fst, boundUpdate.snd, true);
2195 }
2196 }
2197 }
2198
2199 private void notifyBoundChange(InferenceBound ib, Type bound, boolean update) {
2200 if (listener != null) {
2201 listener.varBoundChanged(this, ib, bound, update);
2202 }
2203 }
2204
2205 public final boolean isCaptured() {
2206 return kind == Kind.CAPTURED;
2207 }
2208
2209 public final boolean isThrows() {
2210 return kind == Kind.THROWS;
2211 }
2212 }
2213
2214 /** Represents NONE.
2215 */
2216 public static class JCNoType extends Type implements NoType {
2217 public JCNoType() {
2218 // Need to use List.nil(), because JCNoType constructor
2219 // gets called in static initializers in Type, where
2220 // noAnnotations is also defined.
2221 super(null, TypeMetadata.EMPTY);
2222 }
2223
2224 @Override
2225 public JCNoType cloneWithMetadata(TypeMetadata md) {
2226 throw new AssertionError("Cannot add metadata to a JCNoType");
2227 }
2228
2229 @Override
2230 public TypeTag getTag() {
2231 return NONE;
2232 }
2233
2234 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2235 public TypeKind getKind() {
2236 return TypeKind.NONE;
2237 }
2238
2239 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2240 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2241 return v.visitNoType(this, p);
2242 }
2243
2244 @Override
2245 public boolean isCompound() { return false; }
2246 }
2247
2248 /** Represents VOID.
2249 */
2250 public static class JCVoidType extends Type implements NoType {
2251
2252 public JCVoidType() {
2253 // Void cannot be annotated
2254 super(null, TypeMetadata.EMPTY);
2255 }
2256
2257 @Override
2258 public JCVoidType cloneWithMetadata(TypeMetadata md) {
2259 throw new AssertionError("Cannot add metadata to a void type");
2260 }
2261
2262 @Override
2263 public TypeTag getTag() {
2264 return VOID;
2265 }
2266
2267 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2268 public TypeKind getKind() {
2269 return TypeKind.VOID;
2270 }
2271
2272 @Override
2273 public boolean isCompound() { return false; }
2274
2275 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2276 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2277 return v.visitNoType(this, p);
2278 }
2279
2280 @Override
2281 public boolean isPrimitiveOrVoid() {
2282 return true;
2283 }
2284 }
2285
2286 static class BottomType extends Type implements NullType {
2287 public BottomType() {
2288 // Bottom is a synthesized internal type, so it cannot be annotated
2289 super(null, TypeMetadata.EMPTY);
2290 }
2291
2292 @Override
2293 public BottomType cloneWithMetadata(TypeMetadata md) {
2294 throw new AssertionError("Cannot add metadata to a bottom type");
2295 }
2296
2297 @Override
2298 public TypeTag getTag() {
2299 return BOT;
2300 }
2301
2302 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2303 public TypeKind getKind() {
2304 return TypeKind.NULL;
2305 }
2306
2307 @Override
2308 public boolean isCompound() { return false; }
2309
2310 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2311 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2312 return v.visitNull(this, p);
2313 }
2314
2315 @Override
2316 public Type constType(Object value) {
2317 return this;
2318 }
2319
2320 @Override
2321 public String stringValue() {
2322 return "null";
2323 }
2324
2325 @Override
2326 public boolean isNullOrReference() {
2327 return true;
2328 }
2329
2330 }
2331
2332 public static class ErrorType extends ClassType
2333 implements javax.lang.model.type.ErrorType {
2334
2335 private Type originalType = null;
2336
2337 public ErrorType(ClassSymbol c, Type originalType) {
2338 this(originalType, c);
2339 c.type = this;
2340 c.kind = ERR;
2341 c.members_field = new Scope.ErrorScope(c);
2342 }
2343
2344 public ErrorType(Type originalType, TypeSymbol tsym) {
2345 super(noType, List.nil(), null);
2346 this.tsym = tsym;
2347 this.originalType = (originalType == null ? noType : originalType);
2348 }
2349
2350 private ErrorType(Type originalType, TypeSymbol tsym,
2351 TypeMetadata metadata) {
2352 super(noType, List.nil(), null, metadata);
2353 this.tsym = tsym;
2354 this.originalType = (originalType == null ? noType : originalType);
2355 }
2356
2357 @Override
2358 public ErrorType cloneWithMetadata(TypeMetadata md) {
2359 return new ErrorType(originalType, tsym, md) {
2360 @Override
2361 public Type baseType() { return ErrorType.this.baseType(); }
2362 };
2363 }
2364
2365 @Override
2366 public TypeTag getTag() {
2367 return ERROR;
2368 }
2369
2370 @Override
2371 public boolean isPartial() {
2372 return true;
2373 }
2374
2375 @Override
2376 public boolean isReference() {
2377 return true;
2378 }
2379
2380 @Override
2381 public boolean isNullOrReference() {
2382 return true;
2383 }
2384
2385 public ErrorType(Name name, TypeSymbol container, Type originalType) {
2386 this(new ClassSymbol(PUBLIC|STATIC|ACYCLIC, name, null, container), originalType);
2387 }
2388
2389 @Override
2390 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
2391 return v.visitErrorType(this, s);
2392 }
2393
2394 public Type constType(Object constValue) { return this; }
2395 @DefinedBy(Api.LANGUAGE_MODEL)
2396 public Type getEnclosingType() { return Type.noType; }
2397 public Type getReturnType() { return this; }
2398 public Type asSub(Symbol sym) { return this; }
2399
2400 public boolean isGenType(Type t) { return true; }
2401 public boolean isErroneous() { return true; }
2402 public boolean isCompound() { return false; }
2403 public boolean isInterface() { return false; }
2404
2405 public List<Type> allparams() { return List.nil(); }
2406 @DefinedBy(Api.LANGUAGE_MODEL)
2407 public List<Type> getTypeArguments() { return List.nil(); }
2408
2409 @DefinedBy(Api.LANGUAGE_MODEL)
2410 public TypeKind getKind() {
2411 return TypeKind.ERROR;
2412 }
2413
2414 public Type getOriginalType() {
2415 return originalType;
2416 }
2417
2418 @DefinedBy(Api.LANGUAGE_MODEL)
2419 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2420 return v.visitError(this, p);
2421 }
2422 }
2423
2424 public static class UnknownType extends Type {
2425
2426 public UnknownType() {
2427 // Unknown is a synthesized internal type, so it cannot be
2428 // annotated.
2429 super(null, TypeMetadata.EMPTY);
2430 }
2431
2432 @Override
2433 public UnknownType cloneWithMetadata(TypeMetadata md) {
2434 throw new AssertionError("Cannot add metadata to an unknown type");
2435 }
2436
2437 @Override
2438 public TypeTag getTag() {
2439 return UNKNOWN;
2440 }
2441
2442 @Override @DefinedBy(Api.LANGUAGE_MODEL)
2443 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
2444 return v.visitUnknown(this, p);
2445 }
2446
2447 @Override
2448 public boolean isPartial() {
2449 return true;
2450 }
2451 }
2452
2453 /**
2454 * A visitor for types. A visitor is used to implement operations
2455 * (or relations) on types. Most common operations on types are
2456 * binary relations and this interface is designed for binary
2457 * relations, that is, operations of the form
2458 * Type × S → R.
2459 * <!-- In plain text: Type x S -> R -->
2460 *
2461 * @param <R> the return type of the operation implemented by this
2462 * visitor; use Void if no return type is needed.
2463 * @param <S> the type of the second argument (the first being the
2464 * type itself) of the operation implemented by this visitor; use
2465 * Void if a second argument is not needed.
2466 */
2467 public interface Visitor<R,S> {
2468 R visitClassType(ClassType t, S s);
2469 R visitWildcardType(WildcardType t, S s);
2470 R visitArrayType(ArrayType t, S s);
2471 R visitMethodType(MethodType t, S s);
2472 R visitPackageType(PackageType t, S s);
2473 R visitModuleType(ModuleType t, S s);
2474 R visitTypeVar(TypeVar t, S s);
2475 R visitCapturedType(CapturedType t, S s);
2476 R visitForAll(ForAll t, S s);
2477 R visitUndetVar(UndetVar t, S s);
2478 R visitErrorType(ErrorType t, S s);
2479 R visitType(Type t, S s);
2480 }
2481 }