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.lang.annotation.Inherited;
30 import java.util.Collections;
31 import java.util.EnumSet;
32 import java.util.HashMap;
33 import java.util.Map;
34 import java.util.Set;
35 import java.util.concurrent.Callable;
36 import java.util.function.Supplier;
37 import java.util.function.Predicate;
38
39 import javax.lang.model.element.Element;
40 import javax.lang.model.element.ElementKind;
41 import javax.lang.model.element.ElementVisitor;
42 import javax.lang.model.element.ExecutableElement;
43 import javax.lang.model.element.Modifier;
44 import javax.lang.model.element.ModuleElement;
45 import javax.lang.model.element.NestingKind;
46 import javax.lang.model.element.PackageElement;
47 import javax.lang.model.element.RecordComponentElement;
48 import javax.lang.model.element.TypeElement;
49 import javax.lang.model.element.TypeParameterElement;
50 import javax.lang.model.element.VariableElement;
51 import javax.tools.JavaFileManager;
52 import javax.tools.JavaFileObject;
53
54 import com.sun.tools.javac.code.Kinds.Kind;
55 import com.sun.tools.javac.comp.Annotate.AnnotationTypeMetadata;
56 import com.sun.tools.javac.code.Type.*;
57 import com.sun.tools.javac.comp.Attr;
58 import com.sun.tools.javac.comp.AttrContext;
59 import com.sun.tools.javac.comp.Env;
60 import com.sun.tools.javac.jvm.*;
61 import com.sun.tools.javac.jvm.PoolConstant;
62 import com.sun.tools.javac.tree.JCTree;
63 import com.sun.tools.javac.tree.JCTree.JCAnnotation;
64 import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
65 import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
66 import com.sun.tools.javac.tree.JCTree.Tag;
67 import com.sun.tools.javac.util.*;
68 import com.sun.tools.javac.util.DefinedBy.Api;
69 import com.sun.tools.javac.util.List;
70 import com.sun.tools.javac.util.Name;
71
72 import static com.sun.tools.javac.code.Flags.*;
73 import static com.sun.tools.javac.code.Kinds.*;
74 import static com.sun.tools.javac.code.Kinds.Kind.*;
75 import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
76 import com.sun.tools.javac.code.Scope.WriteableScope;
77 import static com.sun.tools.javac.code.TypeTag.CLASS;
78 import static com.sun.tools.javac.code.TypeTag.FORALL;
79 import static com.sun.tools.javac.code.TypeTag.TYPEVAR;
80 import static com.sun.tools.javac.jvm.ByteCodes.iadd;
81 import static com.sun.tools.javac.jvm.ByteCodes.ishll;
82 import static com.sun.tools.javac.jvm.ByteCodes.lushrl;
83 import static com.sun.tools.javac.jvm.ByteCodes.lxor;
84 import static com.sun.tools.javac.jvm.ByteCodes.string_add;
85
86 /** Root class for Java symbols. It contains subclasses
87 * for specific sorts of symbols, such as variables, methods and operators,
88 * types, packages. Each subclass is represented as a static inner class
89 * inside Symbol.
90 *
91 * <p><b>This is NOT part of any supported API.
92 * If you write code that depends on this, you do so at your own risk.
93 * This code and its internal interfaces are subject to change or
94 * deletion without notice.</b>
95 */
96 public abstract class Symbol extends AnnoConstruct implements PoolConstant, Element {
97
98 /** The kind of this symbol.
99 * @see Kinds
100 */
101 public Kind kind;
102
103 /** The flags of this symbol.
104 */
105 public long flags_field;
106
107 /** An accessor method for the flags of this symbol.
108 * Flags of class symbols should be accessed through the accessor
109 * method to make sure that the class symbol is loaded.
110 */
111 public long flags() { return flags_field; }
112
113 /** The name of this symbol in Utf8 representation.
114 */
115 public Name name;
116
117 /** The type of this symbol.
118 */
119 public Type type;
120
121 /** The owner of this symbol.
122 */
123 public Symbol owner;
124
125 /** The completer of this symbol.
126 * This should never equal null (NULL_COMPLETER should be used instead).
127 */
128 public Completer completer;
129
130 /** A cache for the type erasure of this symbol.
131 */
132 public Type erasure_field;
133
134 // <editor-fold defaultstate="collapsed" desc="annotations">
135
136 /** The attributes of this symbol are contained in this
137 * SymbolMetadata. The SymbolMetadata instance is NOT immutable.
138 */
139 protected SymbolMetadata metadata;
140
141
142 /** An accessor method for the attributes of this symbol.
143 * Attributes of class symbols should be accessed through the accessor
144 * method to make sure that the class symbol is loaded.
145 */
146 public List<Attribute.Compound> getRawAttributes() {
147 return (metadata == null)
148 ? List.nil()
149 : metadata.getDeclarationAttributes();
150 }
151
152 /** An accessor method for the type attributes of this symbol.
153 * Attributes of class symbols should be accessed through the accessor
154 * method to make sure that the class symbol is loaded.
155 */
156 public List<Attribute.TypeCompound> getRawTypeAttributes() {
157 return (metadata == null)
158 ? List.nil()
159 : metadata.getTypeAttributes();
160 }
161
162 /** Fetch a particular annotation from a symbol. */
163 public Attribute.Compound attribute(Symbol anno) {
164 for (Attribute.Compound a : getRawAttributes()) {
165 if (a.type.tsym == anno) return a;
166 }
167 return null;
168 }
169
170 public boolean annotationsPendingCompletion() {
171 return metadata == null ? false : metadata.pendingCompletion();
172 }
173
174 public void appendAttributes(List<Attribute.Compound> l) {
175 if (l.nonEmpty()) {
176 initedMetadata().append(l);
177 }
178 }
179
180 public void appendClassInitTypeAttributes(List<Attribute.TypeCompound> l) {
181 if (l.nonEmpty()) {
182 initedMetadata().appendClassInitTypeAttributes(l);
183 }
184 }
185
186 public void appendInitTypeAttributes(List<Attribute.TypeCompound> l) {
187 if (l.nonEmpty()) {
188 initedMetadata().appendInitTypeAttributes(l);
189 }
190 }
191
192 public void appendUniqueTypeAttributes(List<Attribute.TypeCompound> l) {
193 if (l.nonEmpty()) {
194 initedMetadata().appendUniqueTypes(l);
195 }
196 }
197
198 public List<Attribute.TypeCompound> getClassInitTypeAttributes() {
199 return (metadata == null)
200 ? List.nil()
201 : metadata.getClassInitTypeAttributes();
202 }
203
204 public List<Attribute.TypeCompound> getInitTypeAttributes() {
205 return (metadata == null)
206 ? List.nil()
207 : metadata.getInitTypeAttributes();
208 }
209
210 public void setInitTypeAttributes(List<Attribute.TypeCompound> l) {
211 initedMetadata().setInitTypeAttributes(l);
212 }
213
214 public void setClassInitTypeAttributes(List<Attribute.TypeCompound> l) {
215 initedMetadata().setClassInitTypeAttributes(l);
216 }
217
218 public List<Attribute.Compound> getDeclarationAttributes() {
219 return (metadata == null)
220 ? List.nil()
221 : metadata.getDeclarationAttributes();
222 }
223
224 public boolean hasAnnotations() {
225 return (metadata != null && !metadata.isEmpty());
226 }
227
228 public boolean hasTypeAnnotations() {
229 return (metadata != null && !metadata.isTypesEmpty());
230 }
231
232 public boolean isCompleted() {
233 return completer.isTerminal();
234 }
235
236 public void prependAttributes(List<Attribute.Compound> l) {
237 if (l.nonEmpty()) {
238 initedMetadata().prepend(l);
239 }
240 }
241
242 public void resetAnnotations() {
243 initedMetadata().reset();
244 }
245
246 public void setAttributes(Symbol other) {
247 if (metadata != null || other.metadata != null) {
248 initedMetadata().setAttributes(other.metadata);
249 }
250 }
251
252 public void setDeclarationAttributes(List<Attribute.Compound> a) {
253 if (metadata != null || a.nonEmpty()) {
254 initedMetadata().setDeclarationAttributes(a);
255 }
256 }
257
258 public void setTypeAttributes(List<Attribute.TypeCompound> a) {
259 if (metadata != null || a.nonEmpty()) {
260 if (metadata == null)
261 metadata = new SymbolMetadata(this);
262 metadata.setTypeAttributes(a);
263 }
264 }
265
266 private SymbolMetadata initedMetadata() {
267 if (metadata == null)
268 metadata = new SymbolMetadata(this);
269 return metadata;
270 }
271
272 /** This method is intended for debugging only. */
273 public SymbolMetadata getMetadata() {
274 return metadata;
275 }
276
277 // </editor-fold>
278
279 /** Construct a symbol with given kind, flags, name, type and owner.
280 */
281 public Symbol(Kind kind, long flags, Name name, Type type, Symbol owner) {
282 this.kind = kind;
283 this.flags_field = flags;
284 this.type = type;
285 this.owner = owner;
286 this.completer = Completer.NULL_COMPLETER;
287 this.erasure_field = null;
288 this.name = name;
289 }
290
291 @Override
292 public int poolTag() {
293 throw new AssertionError("Invalid pool entry");
294 }
295
296 /** Clone this symbol with new owner.
297 * Legal only for fields and methods.
298 */
299 public Symbol clone(Symbol newOwner) {
300 throw new AssertionError();
301 }
302
303 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
304 return v.visitSymbol(this, p);
305 }
306
307 /** The Java source which this symbol represents.
308 * A description of this symbol; overrides Object.
309 */
310 public String toString() {
311 return name.toString();
312 }
313
314 /** A Java source description of the location of this symbol; used for
315 * error reporting.
316 *
317 * @return null if the symbol is a package or a toplevel class defined in
318 * the default package; otherwise, the owner symbol is returned
319 */
320 public Symbol location() {
321 if (owner.name == null || (owner.name.isEmpty() &&
322 (owner.flags() & BLOCK) == 0 &&
323 owner.kind != PCK &&
324 owner.kind != TYP)) {
325 return null;
326 }
327 return owner;
328 }
329
330 public Symbol location(Type site, Types types) {
331 if (owner.name == null || owner.name.isEmpty()) {
332 return location();
333 }
334 if (owner.type.hasTag(CLASS)) {
335 Type ownertype = types.asOuterSuper(site, owner);
336 if (ownertype != null) return ownertype.tsym;
337 }
338 return owner;
339 }
340
341 public Symbol baseSymbol() {
342 return this;
343 }
344
345 /** The symbol's erased type.
346 */
347 public Type erasure(Types types) {
348 if (erasure_field == null)
349 erasure_field = types.erasure(type);
350 return erasure_field;
351 }
352
353 /** The external type of a symbol. This is the symbol's erased type
354 * except for constructors of inner classes which get the enclosing
355 * instance class added as first argument.
356 */
357 public Type externalType(Types types) {
358 Type t = erasure(types);
359 if (name == name.table.names.init && owner.hasOuterInstance()) {
360 Type outerThisType = types.erasure(owner.type.getEnclosingType());
361 return new MethodType(t.getParameterTypes().prepend(outerThisType),
362 t.getReturnType(),
363 t.getThrownTypes(),
364 t.tsym);
365 } else {
366 return t;
367 }
368 }
369
370 public boolean isDeprecated() {
371 return (flags_field & DEPRECATED) != 0;
372 }
373
374 public boolean hasDeprecatedAnnotation() {
375 return (flags_field & DEPRECATED_ANNOTATION) != 0;
376 }
377
378 public boolean isDeprecatedForRemoval() {
379 return (flags_field & DEPRECATED_REMOVAL) != 0;
380 }
381
382 public boolean isPreviewApi() {
383 return (flags_field & PREVIEW_API) != 0;
384 }
385
386 public boolean isDeprecatableViaAnnotation() {
387 switch (getKind()) {
388 case LOCAL_VARIABLE:
389 case PACKAGE:
390 case PARAMETER:
391 case RESOURCE_VARIABLE:
392 case EXCEPTION_PARAMETER:
393 return false;
394 default:
395 return true;
396 }
397 }
398
399 public boolean isStatic() {
400 return
401 (flags() & STATIC) != 0 ||
402 (owner.flags() & INTERFACE) != 0 && kind != MTH &&
403 name != name.table.names._this;
404 }
405
406 public boolean isInterface() {
407 return (flags() & INTERFACE) != 0;
408 }
409
410 public boolean isAbstract() {
411 return (flags_field & ABSTRACT) != 0;
412 }
413
414 public boolean isPrivate() {
415 return (flags_field & Flags.AccessFlags) == PRIVATE;
416 }
417
418 public boolean isPublic() {
419 return (flags_field & Flags.AccessFlags) == PUBLIC;
420 }
421
422 public boolean isEnum() {
423 return (flags() & ENUM) != 0;
424 }
425
426 public boolean isSealed() {
427 return (flags_field & SEALED) != 0;
428 }
429
430 public boolean isNonSealed() {
431 return (flags_field & NON_SEALED) != 0;
432 }
433
434 public boolean isFinal() {
435 return (flags_field & FINAL) != 0;
436 }
437
438 /** Is this symbol declared (directly or indirectly) local
439 * to a method or variable initializer?
440 * Also includes fields of inner classes which are in
441 * turn local to a method or variable initializer.
442 */
443 public boolean isDirectlyOrIndirectlyLocal() {
444 return
445 (owner.kind.matches(KindSelector.VAL_MTH) ||
446 (owner.kind == TYP && owner.isDirectlyOrIndirectlyLocal()));
447 }
448
449 /** Has this symbol an empty name? This includes anonymous
450 * inner classes.
451 */
452 public boolean isAnonymous() {
453 return name.isEmpty();
454 }
455
456 /** Is this symbol a constructor?
457 */
458 public boolean isConstructor() {
459 return name == name.table.names.init;
460 }
461
462 public boolean isDynamic() {
463 return false;
464 }
465
466 /** The fully qualified name of this symbol.
467 * This is the same as the symbol's name except for class symbols,
468 * which are handled separately.
469 */
470 public Name getQualifiedName() {
471 return name;
472 }
473
474 /** The fully qualified name of this symbol after converting to flat
475 * representation. This is the same as the symbol's name except for
476 * class symbols, which are handled separately.
477 */
478 public Name flatName() {
479 return getQualifiedName();
480 }
481
482 /** If this is a class or package, its members, otherwise null.
483 */
484 public WriteableScope members() {
485 return null;
486 }
487
488 /** A class is an inner class if it it has an enclosing instance class.
489 */
490 public boolean isInner() {
491 return kind == TYP && type.getEnclosingType().hasTag(CLASS);
492 }
493
494 /** An inner class has an outer instance if it is not an interface
495 * it has an enclosing instance class which might be referenced from the class.
496 * Nested classes can see instance members of their enclosing class.
497 * Their constructors carry an additional this$n parameter, inserted
498 * implicitly by the compiler.
499 *
500 * @see #isInner
501 */
502 public boolean hasOuterInstance() {
503 return
504 type.getEnclosingType().hasTag(CLASS) && (flags() & (INTERFACE | NOOUTERTHIS)) == 0;
505 }
506
507 /** The closest enclosing class of this symbol's declaration.
508 * Warning: this (misnamed) method returns the receiver itself
509 * when the receiver is a class (as opposed to its enclosing
510 * class as one may be misled to believe.)
511 */
512 public ClassSymbol enclClass() {
513 Symbol c = this;
514 while (c != null &&
515 (!c.kind.matches(KindSelector.TYP) || !c.type.hasTag(CLASS))) {
516 c = c.owner;
517 }
518 return (ClassSymbol)c;
519 }
520
521 /** The outermost class which indirectly owns this symbol.
522 */
523 public ClassSymbol outermostClass() {
524 Symbol sym = this;
525 Symbol prev = null;
526 while (sym.kind != PCK) {
527 prev = sym;
528 sym = sym.owner;
529 }
530 return (ClassSymbol) prev;
531 }
532
533 /** The package which indirectly owns this symbol.
534 */
535 public PackageSymbol packge() {
536 Symbol sym = this;
537 while (sym.kind != PCK) {
538 sym = sym.owner;
539 }
540 return (PackageSymbol) sym;
541 }
542
543 /** Is this symbol a subclass of `base'? Only defined for ClassSymbols.
544 */
545 public boolean isSubClass(Symbol base, Types types) {
546 throw new AssertionError("isSubClass " + this);
547 }
548
549 /** Fully check membership: hierarchy, protection, and hiding.
550 * Does not exclude methods not inherited due to overriding.
551 */
552 public boolean isMemberOf(TypeSymbol clazz, Types types) {
553 return
554 owner == clazz ||
555 clazz.isSubClass(owner, types) &&
556 isInheritedIn(clazz, types) &&
557 !hiddenIn((ClassSymbol)clazz, types);
558 }
559
560 /** Is this symbol the same as or enclosed by the given class? */
561 public boolean isEnclosedBy(ClassSymbol clazz) {
562 for (Symbol sym = this; sym.kind != PCK; sym = sym.owner)
563 if (sym == clazz) return true;
564 return false;
565 }
566
567 private boolean hiddenIn(ClassSymbol clazz, Types types) {
568 Symbol sym = hiddenInInternal(clazz, types);
569 Assert.check(sym != null, "the result of hiddenInInternal() can't be null");
570 /* If we find the current symbol then there is no symbol hiding it
571 */
572 return sym != this;
573 }
574
575 /** This method looks in the supertypes graph that has the current class as the
576 * initial node, till it finds the current symbol or another symbol that hides it.
577 * If the current class has more than one supertype (extends one class and
578 * implements one or more interfaces) then null can be returned, meaning that
579 * a wrong path in the supertypes graph was selected. Null can only be returned
580 * as a temporary value, as a result of the recursive call.
581 */
582 private Symbol hiddenInInternal(ClassSymbol currentClass, Types types) {
583 if (currentClass == owner) {
584 return this;
585 }
586 for (Symbol sym : currentClass.members().getSymbolsByName(name)) {
587 if (sym.kind == kind &&
588 (kind != MTH ||
589 (sym.flags() & STATIC) != 0 &&
590 types.isSubSignature(sym.type, type))) {
591 return sym;
592 }
593 }
594 Symbol hiddenSym = null;
595 for (Type st : types.interfaces(currentClass.type)
596 .prepend(types.supertype(currentClass.type))) {
597 if (st != null && (st.hasTag(CLASS))) {
598 Symbol sym = hiddenInInternal((ClassSymbol)st.tsym, types);
599 if (sym == this) {
600 return this;
601 } else if (sym != null) {
602 hiddenSym = sym;
603 }
604 }
605 }
606 return hiddenSym;
607 }
608
609 /** Is this symbol accessible in a given class?
610 * PRE: If symbol's owner is a interface,
611 * it is already assumed that the interface is a superinterface
612 * the given class.
613 * @param clazz The class for which we want to establish membership.
614 * This must be a subclass of the member's owner.
615 */
616 public final boolean isAccessibleIn(Symbol clazz, Types types) {
617 switch ((int)(flags_field & Flags.AccessFlags)) {
618 default: // error recovery
619 case PUBLIC:
620 return true;
621 case PRIVATE:
622 return this.owner == clazz;
623 case PROTECTED:
624 // we model interfaces as extending Object
625 return (clazz.flags() & INTERFACE) == 0;
626 case 0:
627 PackageSymbol thisPackage = this.packge();
628 for (Symbol sup = clazz;
629 sup != null && sup != this.owner;
630 sup = types.supertype(sup.type).tsym) {
631 while (sup.type.hasTag(TYPEVAR))
632 sup = sup.type.getUpperBound().tsym;
633 if (sup.type.isErroneous())
634 return true; // error recovery
635 if ((sup.flags() & COMPOUND) != 0)
636 continue;
637 if (sup.packge() != thisPackage)
638 return false;
639 }
640 return (clazz.flags() & INTERFACE) == 0;
641 }
642 }
643
644 /** Is this symbol inherited into a given class?
645 * PRE: If symbol's owner is a interface,
646 * it is already assumed that the interface is a superinterface
647 * of the given class.
648 * @param clazz The class for which we want to establish membership.
649 * This must be a subclass of the member's owner.
650 */
651 public boolean isInheritedIn(Symbol clazz, Types types) {
652 return isAccessibleIn(clazz, types);
653 }
654
655 /** The (variable or method) symbol seen as a member of given
656 * class type`site' (this might change the symbol's type).
657 * This is used exclusively for producing diagnostics.
658 */
659 public Symbol asMemberOf(Type site, Types types) {
660 throw new AssertionError();
661 }
662
663 /** Does this method symbol override `other' symbol, when both are seen as
664 * members of class `origin'? It is assumed that _other is a member
665 * of origin.
666 *
667 * It is assumed that both symbols have the same name. The static
668 * modifier is ignored for this test.
669 *
670 * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4
671 */
672 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult) {
673 return false;
674 }
675
676 /** Complete the elaboration of this symbol's definition.
677 */
678 public void complete() throws CompletionFailure {
679 if (completer != Completer.NULL_COMPLETER) {
680 Completer c = completer;
681 completer = Completer.NULL_COMPLETER;
682 c.complete(this);
683 }
684 }
685
686 public void apiComplete() throws CompletionFailure {
687 try {
688 complete();
689 } catch (CompletionFailure cf) {
690 cf.dcfh.handleAPICompletionFailure(cf);
691 }
692 }
693
694 /** True if the symbol represents an entity that exists.
695 */
696 public boolean exists() {
697 return true;
698 }
699
700 @DefinedBy(Api.LANGUAGE_MODEL)
701 public Type asType() {
702 return type;
703 }
704
705 @DefinedBy(Api.LANGUAGE_MODEL)
706 public Symbol getEnclosingElement() {
707 return owner;
708 }
709
710 @DefinedBy(Api.LANGUAGE_MODEL)
711 public ElementKind getKind() {
712 return ElementKind.OTHER; // most unkind
713 }
714
715 @DefinedBy(Api.LANGUAGE_MODEL)
716 public Set<Modifier> getModifiers() {
717 apiComplete();
718 return Flags.asModifierSet(flags());
719 }
720
721 @DefinedBy(Api.LANGUAGE_MODEL)
722 public Name getSimpleName() {
723 return name;
724 }
725
726 /**
727 * This is the implementation for {@code
728 * javax.lang.model.element.Element.getAnnotationMirrors()}.
729 */
730 @Override @DefinedBy(Api.LANGUAGE_MODEL)
731 public List<Attribute.Compound> getAnnotationMirrors() {
732 apiComplete();
733 return getRawAttributes();
734 }
735
736
737 // TODO: getEnclosedElements should return a javac List, fix in FilteredMemberList
738 @DefinedBy(Api.LANGUAGE_MODEL)
739 public java.util.List<Symbol> getEnclosedElements() {
740 return List.nil();
741 }
742
743 public List<TypeVariableSymbol> getTypeParameters() {
744 ListBuffer<TypeVariableSymbol> l = new ListBuffer<>();
745 for (Type t : type.getTypeArguments()) {
746 Assert.check(t.tsym.getKind() == ElementKind.TYPE_PARAMETER);
747 l.append((TypeVariableSymbol)t.tsym);
748 }
749 return l.toList();
750 }
751
752 public static class DelegatedSymbol<T extends Symbol> extends Symbol {
753 protected T other;
754 public DelegatedSymbol(T other) {
755 super(other.kind, other.flags_field, other.name, other.type, other.owner);
756 this.other = other;
757 }
758 public String toString() { return other.toString(); }
759 public Symbol location() { return other.location(); }
760 public Symbol location(Type site, Types types) { return other.location(site, types); }
761 public Symbol baseSymbol() { return other; }
762 public Type erasure(Types types) { return other.erasure(types); }
763 public Type externalType(Types types) { return other.externalType(types); }
764 public boolean isDirectlyOrIndirectlyLocal() { return other.isDirectlyOrIndirectlyLocal(); }
765 public boolean isConstructor() { return other.isConstructor(); }
766 public Name getQualifiedName() { return other.getQualifiedName(); }
767 public Name flatName() { return other.flatName(); }
768 public WriteableScope members() { return other.members(); }
769 public boolean isInner() { return other.isInner(); }
770 public boolean hasOuterInstance() { return other.hasOuterInstance(); }
771 public ClassSymbol enclClass() { return other.enclClass(); }
772 public ClassSymbol outermostClass() { return other.outermostClass(); }
773 public PackageSymbol packge() { return other.packge(); }
774 public boolean isSubClass(Symbol base, Types types) { return other.isSubClass(base, types); }
775 public boolean isMemberOf(TypeSymbol clazz, Types types) { return other.isMemberOf(clazz, types); }
776 public boolean isEnclosedBy(ClassSymbol clazz) { return other.isEnclosedBy(clazz); }
777 public boolean isInheritedIn(Symbol clazz, Types types) { return other.isInheritedIn(clazz, types); }
778 public Symbol asMemberOf(Type site, Types types) { return other.asMemberOf(site, types); }
779 public void complete() throws CompletionFailure { other.complete(); }
780
781 @DefinedBy(Api.LANGUAGE_MODEL)
782 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
783 return other.accept(v, p);
784 }
785
786 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
787 return v.visitSymbol(other, p);
788 }
789
790 public T getUnderlyingSymbol() {
791 return other;
792 }
793 }
794
795 /** A base class for Symbols representing types.
796 */
797 public static abstract class TypeSymbol extends Symbol {
798 public TypeSymbol(Kind kind, long flags, Name name, Type type, Symbol owner) {
799 super(kind, flags, name, type, owner);
800 }
801 /** form a fully qualified name from a name and an owner
802 */
803 public static Name formFullName(Name name, Symbol owner) {
804 if (owner == null) return name;
805 if ((owner.kind != ERR) &&
806 (owner.kind.matches(KindSelector.VAL_MTH) ||
807 (owner.kind == TYP && owner.type.hasTag(TYPEVAR))
808 )) return name;
809 Name prefix = owner.getQualifiedName();
810 if (prefix == null || prefix == prefix.table.names.empty)
811 return name;
812 else return prefix.append('.', name);
813 }
814
815 /** form a fully qualified name from a name and an owner, after
816 * converting to flat representation
817 */
818 public static Name formFlatName(Name name, Symbol owner) {
819 if (owner == null || owner.kind.matches(KindSelector.VAL_MTH) ||
820 (owner.kind == TYP && owner.type.hasTag(TYPEVAR))
821 ) return name;
822 char sep = owner.kind == TYP ? '$' : '.';
823 Name prefix = owner.flatName();
824 if (prefix == null || prefix == prefix.table.names.empty)
825 return name;
826 else return prefix.append(sep, name);
827 }
828
829 /**
830 * A partial ordering between type symbols that refines the
831 * class inheritance graph.
832 *
833 * Type variables always precede other kinds of symbols.
834 */
835 public final boolean precedes(TypeSymbol that, Types types) {
836 if (this == that)
837 return false;
838 if (type.hasTag(that.type.getTag())) {
839 if (type.hasTag(CLASS)) {
840 return
841 types.rank(that.type) < types.rank(this.type) ||
842 types.rank(that.type) == types.rank(this.type) &&
843 that.getQualifiedName().compareTo(this.getQualifiedName()) < 0;
844 } else if (type.hasTag(TYPEVAR)) {
845 return types.isSubtype(this.type, that.type);
846 }
847 }
848 return type.hasTag(TYPEVAR);
849 }
850
851 @Override @DefinedBy(Api.LANGUAGE_MODEL)
852 public List<Symbol> getEnclosedElements() {
853 List<Symbol> list = List.nil();
854 if (kind == TYP && type.hasTag(TYPEVAR)) {
855 return list;
856 }
857 apiComplete();
858 for (Symbol sym : members().getSymbols(NON_RECURSIVE)) {
859 sym.apiComplete();
860 if ((sym.flags() & SYNTHETIC) == 0 && sym.owner == this && sym.kind != ERR) {
861 list = list.prepend(sym);
862 }
863 }
864 return list;
865 }
866
867 public AnnotationTypeMetadata getAnnotationTypeMetadata() {
868 Assert.error("Only on ClassSymbol");
869 return null; //unreachable
870 }
871
872 public boolean isAnnotationType() { return false; }
873
874 @Override
875 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
876 return v.visitTypeSymbol(this, p);
877 }
878 }
879
880 /**
881 * Type variables are represented by instances of this class.
882 */
883 public static class TypeVariableSymbol
884 extends TypeSymbol implements TypeParameterElement {
885
886 public TypeVariableSymbol(long flags, Name name, Type type, Symbol owner) {
887 super(TYP, flags, name, type, owner);
888 }
889
890 @DefinedBy(Api.LANGUAGE_MODEL)
891 public ElementKind getKind() {
892 return ElementKind.TYPE_PARAMETER;
893 }
894
895 @Override @DefinedBy(Api.LANGUAGE_MODEL)
896 public Symbol getGenericElement() {
897 return owner;
898 }
899
900 @DefinedBy(Api.LANGUAGE_MODEL)
901 public List<Type> getBounds() {
902 TypeVar t = (TypeVar)type;
903 Type bound = t.getUpperBound();
904 if (!bound.isCompound())
905 return List.of(bound);
906 ClassType ct = (ClassType)bound;
907 if (!ct.tsym.erasure_field.isInterface()) {
908 return ct.interfaces_field.prepend(ct.supertype_field);
909 } else {
910 // No superclass was given in bounds.
911 // In this case, supertype is Object, erasure is first interface.
912 return ct.interfaces_field;
913 }
914 }
915
916 @Override @DefinedBy(Api.LANGUAGE_MODEL)
917 public List<Attribute.Compound> getAnnotationMirrors() {
918 // Declaration annotations on type variables are stored in type attributes
919 // on the owner of the TypeVariableSymbol
920 List<Attribute.TypeCompound> candidates = owner.getRawTypeAttributes();
921 int index = owner.getTypeParameters().indexOf(this);
922 List<Attribute.Compound> res = List.nil();
923 for (Attribute.TypeCompound a : candidates) {
924 if (isCurrentSymbolsAnnotation(a, index))
925 res = res.prepend(a);
926 }
927
928 return res.reverse();
929 }
930
931 // Helper to getAnnotation[s]
932 @Override
933 public <A extends Annotation> Attribute.Compound getAttribute(Class<A> annoType) {
934 String name = annoType.getName();
935
936 // Declaration annotations on type variables are stored in type attributes
937 // on the owner of the TypeVariableSymbol
938 List<Attribute.TypeCompound> candidates = owner.getRawTypeAttributes();
939 int index = owner.getTypeParameters().indexOf(this);
940 for (Attribute.TypeCompound anno : candidates)
941 if (isCurrentSymbolsAnnotation(anno, index) &&
942 name.contentEquals(anno.type.tsym.flatName()))
943 return anno;
944
945 return null;
946 }
947 //where:
948 boolean isCurrentSymbolsAnnotation(Attribute.TypeCompound anno, int index) {
949 return (anno.position.type == TargetType.CLASS_TYPE_PARAMETER ||
950 anno.position.type == TargetType.METHOD_TYPE_PARAMETER) &&
951 anno.position.parameter_index == index;
952 }
953
954
955 @Override @DefinedBy(Api.LANGUAGE_MODEL)
956 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
957 return v.visitTypeParameter(this, p);
958 }
959 }
960 /** A class for module symbols.
961 */
962 public static class ModuleSymbol extends TypeSymbol
963 implements ModuleElement {
964
965 public Name version;
966 public JavaFileManager.Location sourceLocation;
967 public JavaFileManager.Location classLocation;
968 public JavaFileManager.Location patchLocation;
969 public JavaFileManager.Location patchOutputLocation;
970
971 /** All directives, in natural order. */
972 public List<com.sun.tools.javac.code.Directive> directives;
973 public List<com.sun.tools.javac.code.Directive.RequiresDirective> requires;
974 public List<com.sun.tools.javac.code.Directive.ExportsDirective> exports;
975 public List<com.sun.tools.javac.code.Directive.OpensDirective> opens;
976 public List<com.sun.tools.javac.code.Directive.ProvidesDirective> provides;
977 public List<com.sun.tools.javac.code.Directive.UsesDirective> uses;
978
979 public ClassSymbol module_info;
980
981 public PackageSymbol unnamedPackage;
982 public Map<Name, PackageSymbol> visiblePackages;
983 public Set<ModuleSymbol> readModules;
984 public List<Symbol> enclosedPackages = List.nil();
985
986 public Completer usesProvidesCompleter = Completer.NULL_COMPLETER;
987 public final Set<ModuleFlags> flags = EnumSet.noneOf(ModuleFlags.class);
988 public final Set<ModuleResolutionFlags> resolutionFlags = EnumSet.noneOf(ModuleResolutionFlags.class);
989
990 /**
991 * Create a ModuleSymbol with an associated module-info ClassSymbol.
992 */
993 public static ModuleSymbol create(Name name, Name module_info) {
994 ModuleSymbol msym = new ModuleSymbol(name, null);
995 ClassSymbol info = new ClassSymbol(Flags.MODULE, module_info, msym);
996 info.fullname = formFullName(module_info, msym);
997 info.flatname = info.fullname;
998 info.members_field = WriteableScope.create(info);
999 msym.module_info = info;
1000 return msym;
1001 }
1002
1003 public ModuleSymbol(Name name, Symbol owner) {
1004 super(MDL, 0, name, null, owner);
1005 Assert.checkNonNull(name);
1006 this.type = new ModuleType(this);
1007 }
1008
1009 @Override
1010 public int poolTag() {
1011 return ClassFile.CONSTANT_Module;
1012 }
1013
1014 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1015 public Name getSimpleName() {
1016 return Convert.shortName(name);
1017 }
1018
1019 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1020 public boolean isOpen() {
1021 return flags.contains(ModuleFlags.OPEN);
1022 }
1023
1024 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1025 public boolean isUnnamed() {
1026 return name.isEmpty() && owner == null;
1027 }
1028
1029 @Override
1030 public boolean isDeprecated() {
1031 return hasDeprecatedAnnotation();
1032 }
1033
1034 public boolean isNoModule() {
1035 return false;
1036 }
1037
1038 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1039 public ElementKind getKind() {
1040 return ElementKind.MODULE;
1041 }
1042
1043 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1044 public java.util.List<Directive> getDirectives() {
1045 apiComplete();
1046 completeUsesProvides();
1047 return Collections.unmodifiableList(directives);
1048 }
1049
1050 public void completeUsesProvides() {
1051 if (usesProvidesCompleter != Completer.NULL_COMPLETER) {
1052 Completer c = usesProvidesCompleter;
1053 usesProvidesCompleter = Completer.NULL_COMPLETER;
1054 c.complete(this);
1055 }
1056 }
1057
1058 @Override
1059 public ClassSymbol outermostClass() {
1060 return null;
1061 }
1062
1063 @Override
1064 public String toString() {
1065 // TODO: the following strings should be localized
1066 // Do this with custom anon subtypes in Symtab
1067 String n = (name == null) ? "<unknown>"
1068 : (name.isEmpty()) ? "<unnamed>"
1069 : String.valueOf(name);
1070 return n;
1071 }
1072
1073 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1074 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1075 return v.visitModule(this, p);
1076 }
1077
1078 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1079 public List<Symbol> getEnclosedElements() {
1080 List<Symbol> list = List.nil();
1081 for (Symbol sym : enclosedPackages) {
1082 if (sym.members().anyMatch(m -> m.kind == TYP))
1083 list = list.prepend(sym);
1084 }
1085 return list;
1086 }
1087
1088 public void reset() {
1089 this.directives = null;
1090 this.requires = null;
1091 this.exports = null;
1092 this.provides = null;
1093 this.uses = null;
1094 this.visiblePackages = null;
1095 }
1096
1097 }
1098
1099 public enum ModuleFlags {
1100 OPEN(0x0020),
1101 SYNTHETIC(0x1000),
1102 MANDATED(0x8000);
1103
1104 public static int value(Set<ModuleFlags> s) {
1105 int v = 0;
1106 for (ModuleFlags f: s)
1107 v |= f.value;
1108 return v;
1109 }
1110
1111 private ModuleFlags(int value) {
1112 this.value = value;
1113 }
1114
1115 public final int value;
1116 }
1117
1118 public enum ModuleResolutionFlags {
1119 DO_NOT_RESOLVE_BY_DEFAULT(0x0001),
1120 WARN_DEPRECATED(0x0002),
1121 WARN_DEPRECATED_REMOVAL(0x0004),
1122 WARN_INCUBATING(0x0008);
1123
1124 public static int value(Set<ModuleResolutionFlags> s) {
1125 int v = 0;
1126 for (ModuleResolutionFlags f: s)
1127 v |= f.value;
1128 return v;
1129 }
1130
1131 private ModuleResolutionFlags(int value) {
1132 this.value = value;
1133 }
1134
1135 public final int value;
1136 }
1137
1138 /** A class for package symbols
1139 */
1140 public static class PackageSymbol extends TypeSymbol
1141 implements PackageElement {
1142
1143 public WriteableScope members_field;
1144 public Name fullname;
1145 public ClassSymbol package_info; // see bug 6443073
1146 public ModuleSymbol modle;
1147 // the file containing the documentation comments for the package
1148 public JavaFileObject sourcefile;
1149
1150 public PackageSymbol(Name name, Type type, Symbol owner) {
1151 super(PCK, 0, name, type, owner);
1152 this.members_field = null;
1153 this.fullname = formFullName(name, owner);
1154 }
1155
1156 public PackageSymbol(Name name, Symbol owner) {
1157 this(name, null, owner);
1158 this.type = new PackageType(this);
1159 }
1160
1161 public String toString() {
1162 return fullname.toString();
1163 }
1164
1165 @DefinedBy(Api.LANGUAGE_MODEL)
1166 public Name getQualifiedName() {
1167 return fullname;
1168 }
1169
1170 @DefinedBy(Api.LANGUAGE_MODEL)
1171 public boolean isUnnamed() {
1172 return name.isEmpty() && owner != null;
1173 }
1174
1175 public WriteableScope members() {
1176 complete();
1177 return members_field;
1178 }
1179
1180 @Override
1181 public int poolTag() {
1182 return ClassFile.CONSTANT_Package;
1183 }
1184
1185 public long flags() {
1186 complete();
1187 return flags_field;
1188 }
1189
1190 @Override
1191 public List<Attribute.Compound> getRawAttributes() {
1192 complete();
1193 if (package_info != null) {
1194 package_info.complete();
1195 mergeAttributes();
1196 }
1197 return super.getRawAttributes();
1198 }
1199
1200 private void mergeAttributes() {
1201 if (metadata == null &&
1202 package_info.metadata != null) {
1203 metadata = new SymbolMetadata(this);
1204 metadata.setAttributes(package_info.metadata);
1205 }
1206 }
1207
1208 /** A package "exists" if a type or package that exists has
1209 * been seen within it.
1210 */
1211 public boolean exists() {
1212 return (flags_field & EXISTS) != 0;
1213 }
1214
1215 @DefinedBy(Api.LANGUAGE_MODEL)
1216 public ElementKind getKind() {
1217 return ElementKind.PACKAGE;
1218 }
1219
1220 @DefinedBy(Api.LANGUAGE_MODEL)
1221 public Symbol getEnclosingElement() {
1222 return modle != null && !modle.isNoModule() ? modle : null;
1223 }
1224
1225 @DefinedBy(Api.LANGUAGE_MODEL)
1226 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1227 return v.visitPackage(this, p);
1228 }
1229
1230 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
1231 return v.visitPackageSymbol(this, p);
1232 }
1233
1234 /**Resets the Symbol into the state good for next round of annotation processing.*/
1235 public void reset() {
1236 metadata = null;
1237 }
1238
1239 }
1240
1241 public static class RootPackageSymbol extends PackageSymbol {
1242 public final MissingInfoHandler missingInfoHandler;
1243 public final boolean allowPrivateInvokeVirtual;
1244
1245 public RootPackageSymbol(Name name, Symbol owner,
1246 MissingInfoHandler missingInfoHandler,
1247 boolean allowPrivateInvokeVirtual) {
1248 super(name, owner);
1249 this.missingInfoHandler = missingInfoHandler;
1250 this.allowPrivateInvokeVirtual = allowPrivateInvokeVirtual;
1251 }
1252
1253 }
1254
1255 /** A class for class symbols
1256 */
1257 public static class ClassSymbol extends TypeSymbol implements TypeElement {
1258
1259 /** a scope for all class members; variables, methods and inner classes
1260 * type parameters are not part of this scope
1261 */
1262 public WriteableScope members_field;
1263
1264 /** the fully qualified name of the class, i.e. pck.outer.inner.
1265 * null for anonymous classes
1266 */
1267 public Name fullname;
1268
1269 /** the fully qualified name of the class after converting to flat
1270 * representation, i.e. pck.outer$inner,
1271 * set externally for local and anonymous classes
1272 */
1273 public Name flatname;
1274
1275 /** the sourcefile where the class came from
1276 */
1277 public JavaFileObject sourcefile;
1278
1279 /** the classfile from where to load this class
1280 * this will have extension .class or .java
1281 */
1282 public JavaFileObject classfile;
1283
1284 /** the list of translated local classes (used for generating
1285 * InnerClasses attribute)
1286 */
1287 public List<ClassSymbol> trans_local;
1288
1289 /** the annotation metadata attached to this class */
1290 private AnnotationTypeMetadata annotationTypeMetadata;
1291
1292 /* the list of any of record components, only non empty if the class is a record
1293 * and it has at least one record component
1294 */
1295 private List<RecordComponent> recordComponents = List.nil();
1296
1297 // sealed classes related fields
1298 /** The classes, or interfaces, permitted to extend this class, or interface
1299 */
1300 public List<Symbol> permitted;
1301
1302 public boolean isPermittedExplicit = false;
1303
1304 public ClassSymbol(long flags, Name name, Type type, Symbol owner) {
1305 super(TYP, flags, name, type, owner);
1306 this.members_field = null;
1307 this.fullname = formFullName(name, owner);
1308 this.flatname = formFlatName(name, owner);
1309 this.sourcefile = null;
1310 this.classfile = null;
1311 this.annotationTypeMetadata = AnnotationTypeMetadata.notAnAnnotationType();
1312 this.permitted = List.nil();
1313 }
1314
1315 public ClassSymbol(long flags, Name name, Symbol owner) {
1316 this(
1317 flags,
1318 name,
1319 new ClassType(Type.noType, null, null),
1320 owner);
1321 this.type.tsym = this;
1322 }
1323
1324 /** The Java source which this symbol represents.
1325 */
1326 public String toString() {
1327 return className();
1328 }
1329
1330 public long flags() {
1331 complete();
1332 return flags_field;
1333 }
1334
1335 public WriteableScope members() {
1336 complete();
1337 return members_field;
1338 }
1339
1340 @Override
1341 public List<Attribute.Compound> getRawAttributes() {
1342 complete();
1343 return super.getRawAttributes();
1344 }
1345
1346 @Override
1347 public List<Attribute.TypeCompound> getRawTypeAttributes() {
1348 complete();
1349 return super.getRawTypeAttributes();
1350 }
1351
1352 public Type erasure(Types types) {
1353 if (erasure_field == null)
1354 erasure_field = new ClassType(types.erasure(type.getEnclosingType()),
1355 List.nil(), this,
1356 type.getMetadata());
1357 return erasure_field;
1358 }
1359
1360 public String className() {
1361 if (name.isEmpty())
1362 return
1363 Log.getLocalizedString("anonymous.class", flatname);
1364 else
1365 return fullname.toString();
1366 }
1367
1368 @DefinedBy(Api.LANGUAGE_MODEL)
1369 public Name getQualifiedName() {
1370 return fullname;
1371 }
1372
1373 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1374 public List<Symbol> getEnclosedElements() {
1375 List<Symbol> result = super.getEnclosedElements();
1376 if (!recordComponents.isEmpty()) {
1377 List<RecordComponent> reversed = recordComponents.reverse();
1378 for (RecordComponent rc : reversed) {
1379 result = result.prepend(rc);
1380 }
1381 }
1382 return result;
1383 }
1384
1385 public Name flatName() {
1386 return flatname;
1387 }
1388
1389 public boolean isSubClass(Symbol base, Types types) {
1390 if (this == base) {
1391 return true;
1392 } else if ((base.flags() & INTERFACE) != 0) {
1393 for (Type t = type; t.hasTag(CLASS); t = types.supertype(t))
1394 for (List<Type> is = types.interfaces(t);
1395 is.nonEmpty();
1396 is = is.tail)
1397 if (is.head.tsym.isSubClass(base, types)) return true;
1398 } else {
1399 for (Type t = type; t.hasTag(CLASS); t = types.supertype(t))
1400 if (t.tsym == base) return true;
1401 }
1402 return false;
1403 }
1404
1405 /** Complete the elaboration of this symbol's definition.
1406 */
1407 public void complete() throws CompletionFailure {
1408 Completer origCompleter = completer;
1409 try {
1410 super.complete();
1411 } catch (CompletionFailure ex) {
1412 ex.dcfh.classSymbolCompleteFailed(this, origCompleter);
1413 // quiet error recovery
1414 flags_field |= (PUBLIC|STATIC);
1415 this.type = new ErrorType(this, Type.noType);
1416 throw ex;
1417 }
1418 }
1419
1420 @DefinedBy(Api.LANGUAGE_MODEL)
1421 public List<Type> getInterfaces() {
1422 apiComplete();
1423 if (type instanceof ClassType classType) {
1424 if (classType.interfaces_field == null) // FIXME: shouldn't be null
1425 classType.interfaces_field = List.nil();
1426 if (classType.all_interfaces_field != null)
1427 return Type.getModelTypes(classType.all_interfaces_field);
1428 return classType.interfaces_field;
1429 } else {
1430 return List.nil();
1431 }
1432 }
1433
1434 @DefinedBy(Api.LANGUAGE_MODEL)
1435 public Type getSuperclass() {
1436 apiComplete();
1437 if (type instanceof ClassType classType) {
1438 if (classType.supertype_field == null) // FIXME: shouldn't be null
1439 classType.supertype_field = Type.noType;
1440 // An interface has no superclass; its supertype is Object.
1441 return classType.isInterface()
1442 ? Type.noType
1443 : classType.supertype_field.getModelType();
1444 } else {
1445 return Type.noType;
1446 }
1447 }
1448
1449 /**
1450 * Returns the next class to search for inherited annotations or {@code null}
1451 * if the next class can't be found.
1452 */
1453 private ClassSymbol getSuperClassToSearchForAnnotations() {
1454
1455 Type sup = getSuperclass();
1456
1457 if (!sup.hasTag(CLASS) || sup.isErroneous())
1458 return null;
1459
1460 return (ClassSymbol) sup.tsym;
1461 }
1462
1463
1464 @Override
1465 protected <A extends Annotation> A[] getInheritedAnnotations(Class<A> annoType) {
1466
1467 ClassSymbol sup = getSuperClassToSearchForAnnotations();
1468
1469 return sup == null ? super.getInheritedAnnotations(annoType)
1470 : sup.getAnnotationsByType(annoType);
1471 }
1472
1473
1474 @DefinedBy(Api.LANGUAGE_MODEL)
1475 public ElementKind getKind() {
1476 apiComplete();
1477 long flags = flags();
1478 if ((flags & ANNOTATION) != 0)
1479 return ElementKind.ANNOTATION_TYPE;
1480 else if ((flags & INTERFACE) != 0)
1481 return ElementKind.INTERFACE;
1482 else if ((flags & ENUM) != 0)
1483 return ElementKind.ENUM;
1484 else if ((flags & RECORD) != 0)
1485 return ElementKind.RECORD;
1486 else
1487 return ElementKind.CLASS;
1488 }
1489
1490 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1491 public Set<Modifier> getModifiers() {
1492 apiComplete();
1493 long flags = flags();
1494 return Flags.asModifierSet(flags & ~DEFAULT);
1495 }
1496
1497 public RecordComponent getRecordComponent(VarSymbol field) {
1498 for (RecordComponent rc : recordComponents) {
1499 if (rc.name == field.name) {
1500 return rc;
1501 }
1502 }
1503 return null;
1504 }
1505
1506 public RecordComponent getRecordComponent(JCVariableDecl var, boolean addIfMissing, List<JCAnnotation> annotations) {
1507 RecordComponent toRemove = null;
1508 for (RecordComponent rc : recordComponents) {
1509 /* it could be that a record erroneously declares two record components with the same name, in that
1510 * case we need to use the position to disambiguate
1511 */
1512 if (rc.name == var.name && var.pos == rc.pos) {
1513 if (rc.type.hasTag(TypeTag.ERROR) && !var.sym.type.hasTag(TypeTag.ERROR)) {
1514 // Found a record component with an erroneous type: save it so that it can be removed later.
1515 // If the class type of the record component is generated by annotation processor, it should
1516 // use the new actual class type and symbol instead of the old dummy ErrorType.
1517 toRemove = rc;
1518 } else {
1519 // Found a good record component: just return.
1520 return rc;
1521 }
1522 }
1523 }
1524 RecordComponent rc = null;
1525 if (toRemove != null) {
1526 // Found a record component with an erroneous type: remove it and create a new one
1527 recordComponents = List.filter(recordComponents, toRemove);
1528 recordComponents = recordComponents.append(rc = new RecordComponent(var.sym, annotations));
1529 } else if (addIfMissing) {
1530 // Didn't find the record component: create one.
1531 recordComponents = recordComponents.append(rc = new RecordComponent(var.sym, annotations));
1532 }
1533 return rc;
1534 }
1535
1536 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1537 public List<? extends RecordComponent> getRecordComponents() {
1538 return recordComponents;
1539 }
1540
1541 public void setRecordComponents(List<RecordComponent> recordComponents) {
1542 this.recordComponents = recordComponents;
1543 }
1544
1545 @DefinedBy(Api.LANGUAGE_MODEL)
1546 public NestingKind getNestingKind() {
1547 apiComplete();
1548 if (owner.kind == PCK)
1549 return NestingKind.TOP_LEVEL;
1550 else if (name.isEmpty())
1551 return NestingKind.ANONYMOUS;
1552 else if (owner.kind == MTH)
1553 return NestingKind.LOCAL;
1554 else
1555 return NestingKind.MEMBER;
1556 }
1557
1558 @Override
1559 protected <A extends Annotation> Attribute.Compound getAttribute(final Class<A> annoType) {
1560
1561 Attribute.Compound attrib = super.getAttribute(annoType);
1562
1563 boolean inherited = annoType.isAnnotationPresent(Inherited.class);
1564 if (attrib != null || !inherited)
1565 return attrib;
1566
1567 // Search supertypes
1568 ClassSymbol superType = getSuperClassToSearchForAnnotations();
1569 return superType == null ? null
1570 : superType.getAttribute(annoType);
1571 }
1572
1573 @DefinedBy(Api.LANGUAGE_MODEL)
1574 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1575 return v.visitType(this, p);
1576 }
1577
1578 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
1579 return v.visitClassSymbol(this, p);
1580 }
1581
1582 public void markAbstractIfNeeded(Types types) {
1583 if (types.enter.getEnv(this) != null &&
1584 (flags() & ENUM) != 0 && types.supertype(type).tsym == types.syms.enumSym &&
1585 (flags() & (FINAL | ABSTRACT)) == 0) {
1586 if (types.firstUnimplementedAbstract(this) != null)
1587 // add the ABSTRACT flag to an enum
1588 flags_field |= ABSTRACT;
1589 }
1590 }
1591
1592 /**Resets the Symbol into the state good for next round of annotation processing.*/
1593 public void reset() {
1594 kind = TYP;
1595 erasure_field = null;
1596 members_field = null;
1597 flags_field = 0;
1598 if (type instanceof ClassType classType) {
1599 classType.setEnclosingType(Type.noType);
1600 classType.rank_field = -1;
1601 classType.typarams_field = null;
1602 classType.allparams_field = null;
1603 classType.supertype_field = null;
1604 classType.interfaces_field = null;
1605 classType.all_interfaces_field = null;
1606 }
1607 clearAnnotationMetadata();
1608 }
1609
1610 public void clearAnnotationMetadata() {
1611 metadata = null;
1612 annotationTypeMetadata = AnnotationTypeMetadata.notAnAnnotationType();
1613 }
1614
1615 @Override
1616 public AnnotationTypeMetadata getAnnotationTypeMetadata() {
1617 return annotationTypeMetadata;
1618 }
1619
1620 @Override
1621 public boolean isAnnotationType() {
1622 return (flags_field & Flags.ANNOTATION) != 0;
1623 }
1624
1625 public void setAnnotationTypeMetadata(AnnotationTypeMetadata a) {
1626 Assert.checkNonNull(a);
1627 Assert.check(!annotationTypeMetadata.isMetadataForAnnotationType());
1628 this.annotationTypeMetadata = a;
1629 }
1630
1631 public boolean isRecord() {
1632 return (flags_field & RECORD) != 0;
1633 }
1634
1635 @DefinedBy(Api.LANGUAGE_MODEL)
1636 public List<Type> getPermittedSubclasses() {
1637 return permitted.map(s -> s.type);
1638 }
1639 }
1640
1641
1642 /** A class for variable symbols
1643 */
1644 public static class VarSymbol extends Symbol implements VariableElement {
1645
1646 /** The variable's declaration position.
1647 */
1648 public int pos = Position.NOPOS;
1649
1650 /** The variable's address. Used for different purposes during
1651 * flow analysis, translation and code generation.
1652 * Flow analysis:
1653 * If this is a blank final or local variable, its sequence number.
1654 * Translation:
1655 * If this is a private field, its access number.
1656 * Code generation:
1657 * If this is a local variable, its logical slot number.
1658 */
1659 public int adr = -1;
1660
1661 /** Construct a variable symbol, given its flags, name, type and owner.
1662 */
1663 public VarSymbol(long flags, Name name, Type type, Symbol owner) {
1664 super(VAR, flags, name, type, owner);
1665 }
1666
1667 @Override
1668 public int poolTag() {
1669 return ClassFile.CONSTANT_Fieldref;
1670 }
1671
1672 public MethodHandleSymbol asMethodHandle(boolean getter) {
1673 return new MethodHandleSymbol(this, getter);
1674 }
1675
1676 /** Clone this symbol with new owner.
1677 */
1678 public VarSymbol clone(Symbol newOwner) {
1679 VarSymbol v = new VarSymbol(flags_field, name, type, newOwner) {
1680 @Override
1681 public Symbol baseSymbol() {
1682 return VarSymbol.this;
1683 }
1684
1685 @Override
1686 public Object poolKey(Types types) {
1687 return new Pair<>(newOwner, baseSymbol());
1688 }
1689 };
1690 v.pos = pos;
1691 v.adr = adr;
1692 v.data = data;
1693 // System.out.println("clone " + v + " in " + newOwner);//DEBUG
1694 return v;
1695 }
1696
1697 public String toString() {
1698 return name.toString();
1699 }
1700
1701 public Symbol asMemberOf(Type site, Types types) {
1702 return new VarSymbol(flags_field, name, types.memberType(site, this), owner);
1703 }
1704
1705 @DefinedBy(Api.LANGUAGE_MODEL)
1706 public ElementKind getKind() {
1707 long flags = flags();
1708 if ((flags & PARAMETER) != 0) {
1709 if (isExceptionParameter())
1710 return ElementKind.EXCEPTION_PARAMETER;
1711 else
1712 return ElementKind.PARAMETER;
1713 } else if ((flags & ENUM) != 0) {
1714 return ElementKind.ENUM_CONSTANT;
1715 } else if (owner.kind == TYP || owner.kind == ERR) {
1716 return ElementKind.FIELD;
1717 } else if (isResourceVariable()) {
1718 return ElementKind.RESOURCE_VARIABLE;
1719 } else if ((flags & MATCH_BINDING) != 0) {
1720 ElementKind kind = ElementKind.BINDING_VARIABLE;
1721 return kind;
1722 } else {
1723 return ElementKind.LOCAL_VARIABLE;
1724 }
1725 }
1726
1727 @DefinedBy(Api.LANGUAGE_MODEL)
1728 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1729 return v.visitVariable(this, p);
1730 }
1731
1732 @DefinedBy(Api.LANGUAGE_MODEL)
1733 public Object getConstantValue() { // Mirror API
1734 return Constants.decode(getConstValue(), type);
1735 }
1736
1737 public void setLazyConstValue(final Env<AttrContext> env,
1738 final Attr attr,
1739 final JCVariableDecl variable)
1740 {
1741 setData((Callable<Object>)() -> attr.attribLazyConstantValue(env, variable, type));
1742 }
1743
1744 /**
1745 * The variable's constant value, if this is a constant.
1746 * Before the constant value is evaluated, it points to an
1747 * initializer environment. If this is not a constant, it can
1748 * be used for other stuff.
1749 */
1750 private Object data;
1751
1752 public boolean isExceptionParameter() {
1753 return data == ElementKind.EXCEPTION_PARAMETER;
1754 }
1755
1756 public boolean isResourceVariable() {
1757 return data == ElementKind.RESOURCE_VARIABLE;
1758 }
1759
1760 public Object getConstValue() {
1761 // TODO: Consider if getConstValue and getConstantValue can be collapsed
1762 if (data == ElementKind.EXCEPTION_PARAMETER ||
1763 data == ElementKind.RESOURCE_VARIABLE) {
1764 return null;
1765 } else if (data instanceof Callable<?> callableData) {
1766 // In this case, this is a final variable, with an as
1767 // yet unevaluated initializer.
1768 data = null; // to make sure we don't evaluate this twice.
1769 try {
1770 data = callableData.call();
1771 } catch (Exception ex) {
1772 throw new AssertionError(ex);
1773 }
1774 }
1775 return data;
1776 }
1777
1778 public void setData(Object data) {
1779 Assert.check(!(data instanceof Env<?>), this);
1780 this.data = data;
1781 }
1782
1783 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
1784 return v.visitVarSymbol(this, p);
1785 }
1786 }
1787
1788 public static class RecordComponent extends VarSymbol implements RecordComponentElement {
1789 public MethodSymbol accessor;
1790 public JCTree.JCMethodDecl accessorMeth;
1791 /* the original annotations applied to the record component
1792 */
1793 private final List<JCAnnotation> originalAnnos;
1794 /* if the user happens to erroneously declare two components with the same name, we need a way to differentiate
1795 * them, the code will fail anyway but we need to keep the information for better error recovery
1796 */
1797 private final int pos;
1798
1799 private final boolean isVarargs;
1800
1801 /**
1802 * Construct a record component, given its flags, name, type and owner.
1803 */
1804 public RecordComponent(Name name, Type type, Symbol owner) {
1805 super(PUBLIC, name, type, owner);
1806 pos = -1;
1807 originalAnnos = List.nil();
1808 isVarargs = false;
1809 }
1810
1811 public RecordComponent(VarSymbol field, List<JCAnnotation> annotations) {
1812 super(PUBLIC, field.name, field.type, field.owner);
1813 this.originalAnnos = annotations;
1814 this.pos = field.pos;
1815 /* it is better to store the original information for this one, instead of relying
1816 * on the info in the type of the symbol. This is because on the presence of APs
1817 * the symbol will be blown out and we won't be able to know if the original
1818 * record component was declared varargs or not.
1819 */
1820 this.isVarargs = type.hasTag(TypeTag.ARRAY) && ((ArrayType)type).isVarargs();
1821 }
1822
1823 public List<JCAnnotation> getOriginalAnnos() { return originalAnnos; }
1824
1825 public boolean isVarargs() {
1826 return isVarargs;
1827 }
1828
1829 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1830 public ElementKind getKind() {
1831 return ElementKind.RECORD_COMPONENT;
1832 }
1833
1834 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1835 public ExecutableElement getAccessor() {
1836 return accessor;
1837 }
1838
1839 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1840 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1841 return v.visitRecordComponent(this, p);
1842 }
1843 }
1844
1845 public static class ParamSymbol extends VarSymbol {
1846 public ParamSymbol(long flags, Name name, Type type, Symbol owner) {
1847 super(flags, name, type, owner);
1848 }
1849
1850 @Override
1851 public Name getSimpleName() {
1852 if ((flags_field & NAME_FILLED) == 0) {
1853 flags_field |= NAME_FILLED;
1854 Symbol rootPack = this;
1855 while (rootPack != null && !(rootPack instanceof RootPackageSymbol)) {
1856 rootPack = rootPack.owner;
1857 }
1858 if (rootPack != null) {
1859 Name inferredName =
1860 ((RootPackageSymbol) rootPack).missingInfoHandler.getParameterName(this);
1861 if (inferredName != null) {
1862 this.name = inferredName;
1863 }
1864 }
1865 }
1866 return super.getSimpleName();
1867 }
1868
1869 }
1870
1871 public static class BindingSymbol extends VarSymbol {
1872
1873 public BindingSymbol(long flags, Name name, Type type, Symbol owner) {
1874 super(flags | Flags.HASINIT | Flags.MATCH_BINDING, name, type, owner);
1875 }
1876
1877 public boolean isAliasFor(BindingSymbol b) {
1878 return aliases().containsAll(b.aliases());
1879 }
1880
1881 List<BindingSymbol> aliases() {
1882 return List.of(this);
1883 }
1884
1885 public void preserveBinding() {
1886 flags_field |= Flags.MATCH_BINDING_TO_OUTER;
1887 }
1888
1889 public boolean isPreserved() {
1890 return (flags_field & Flags.MATCH_BINDING_TO_OUTER) != 0;
1891 }
1892 }
1893
1894 /** A class for method symbols.
1895 */
1896 public static class MethodSymbol extends Symbol implements ExecutableElement {
1897
1898 /** The code of the method. */
1899 public Code code = null;
1900
1901 /** The extra (synthetic/mandated) parameters of the method. */
1902 public List<VarSymbol> extraParams = List.nil();
1903
1904 /** The captured local variables in an anonymous class */
1905 public List<VarSymbol> capturedLocals = List.nil();
1906
1907 /** The parameters of the method. */
1908 public List<VarSymbol> params = null;
1909
1910 /** For an annotation type element, its default value if any.
1911 * The value is null if none appeared in the method
1912 * declaration.
1913 */
1914 public Attribute defaultValue = null;
1915
1916 /** Construct a method symbol, given its flags, name, type and owner.
1917 */
1918 public MethodSymbol(long flags, Name name, Type type, Symbol owner) {
1919 super(MTH, flags, name, type, owner);
1920 if (owner.type.hasTag(TYPEVAR)) Assert.error(owner + "." + name);
1921 }
1922
1923 /** Clone this symbol with new owner.
1924 */
1925 public MethodSymbol clone(Symbol newOwner) {
1926 MethodSymbol m = new MethodSymbol(flags_field, name, type, newOwner) {
1927 @Override
1928 public Symbol baseSymbol() {
1929 return MethodSymbol.this;
1930 }
1931
1932 @Override
1933 public Object poolKey(Types types) {
1934 return new Pair<>(newOwner, baseSymbol());
1935 }
1936 };
1937 m.code = code;
1938 return m;
1939 }
1940
1941 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1942 public Set<Modifier> getModifiers() {
1943 long flags = flags();
1944 return Flags.asModifierSet((flags & DEFAULT) != 0 ? flags & ~ABSTRACT : flags);
1945 }
1946
1947 /** The Java source which this symbol represents.
1948 */
1949 public String toString() {
1950 if ((flags() & BLOCK) != 0) {
1951 return owner.name.toString();
1952 } else {
1953 String s = (name == name.table.names.init)
1954 ? owner.name.toString()
1955 : name.toString();
1956 if (type != null) {
1957 if (type.hasTag(FORALL))
1958 s = "<" + ((ForAll)type).getTypeArguments() + ">" + s;
1959 s += "(" + type.argtypes((flags() & VARARGS) != 0) + ")";
1960 }
1961 return s;
1962 }
1963 }
1964
1965 @Override
1966 public int poolTag() {
1967 return owner.isInterface() ?
1968 ClassFile.CONSTANT_InterfaceMethodref : ClassFile.CONSTANT_Methodref;
1969 }
1970
1971 public boolean isHandle() {
1972 return false;
1973 }
1974
1975
1976 public MethodHandleSymbol asHandle() {
1977 return new MethodHandleSymbol(this);
1978 }
1979
1980 /** find a symbol that this (proxy method) symbol implements.
1981 * @param c The class whose members are searched for
1982 * implementations
1983 */
1984 public Symbol implemented(TypeSymbol c, Types types) {
1985 Symbol impl = null;
1986 for (List<Type> is = types.interfaces(c.type);
1987 impl == null && is.nonEmpty();
1988 is = is.tail) {
1989 TypeSymbol i = is.head.tsym;
1990 impl = implementedIn(i, types);
1991 if (impl == null)
1992 impl = implemented(i, types);
1993 }
1994 return impl;
1995 }
1996
1997 public Symbol implementedIn(TypeSymbol c, Types types) {
1998 Symbol impl = null;
1999 for (Symbol sym : c.members().getSymbolsByName(name)) {
2000 if (this.overrides(sym, (TypeSymbol)owner, types, true) &&
2001 // FIXME: I suspect the following requires a
2002 // subst() for a parametric return type.
2003 types.isSameType(type.getReturnType(),
2004 types.memberType(owner.type, sym).getReturnType())) {
2005 impl = sym;
2006 }
2007 }
2008 return impl;
2009 }
2010
2011 /** Will the erasure of this method be considered by the VM to
2012 * override the erasure of the other when seen from class `origin'?
2013 */
2014 public boolean binaryOverrides(Symbol _other, TypeSymbol origin, Types types) {
2015 if (isConstructor() || _other.kind != MTH) return false;
2016
2017 if (this == _other) return true;
2018 MethodSymbol other = (MethodSymbol)_other;
2019
2020 // check for a direct implementation
2021 if (other.isOverridableIn((TypeSymbol)owner) &&
2022 types.asSuper(owner.type, other.owner) != null &&
2023 types.isSameType(erasure(types), other.erasure(types)))
2024 return true;
2025
2026 // check for an inherited implementation
2027 return
2028 (flags() & ABSTRACT) == 0 &&
2029 other.isOverridableIn(origin) &&
2030 this.isMemberOf(origin, types) &&
2031 types.isSameType(erasure(types), other.erasure(types));
2032 }
2033
2034 /** The implementation of this (abstract) symbol in class origin,
2035 * from the VM's point of view, null if method does not have an
2036 * implementation in class.
2037 * @param origin The class of which the implementation is a member.
2038 */
2039 public MethodSymbol binaryImplementation(ClassSymbol origin, Types types) {
2040 for (TypeSymbol c = origin; c != null; c = types.supertype(c.type).tsym) {
2041 for (Symbol sym : c.members().getSymbolsByName(name)) {
2042 if (sym.kind == MTH &&
2043 ((MethodSymbol)sym).binaryOverrides(this, origin, types))
2044 return (MethodSymbol)sym;
2045 }
2046 }
2047 return null;
2048 }
2049
2050 /** Does this symbol override `other' symbol, when both are seen as
2051 * members of class `origin'? It is assumed that _other is a member
2052 * of origin.
2053 *
2054 * It is assumed that both symbols have the same name. The static
2055 * modifier is ignored for this test.
2056 *
2057 * A quirk in the works is that if the receiver is a method symbol for
2058 * an inherited abstract method we answer false summarily all else being
2059 * immaterial. Abstract "own" methods (i.e `this' is a direct member of
2060 * origin) don't get rejected as summarily and are put to test against the
2061 * suitable criteria.
2062 *
2063 * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4
2064 */
2065 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult) {
2066 return overrides(_other, origin, types, checkResult, true);
2067 }
2068
2069 /** Does this symbol override `other' symbol, when both are seen as
2070 * members of class `origin'? It is assumed that _other is a member
2071 * of origin.
2072 *
2073 * Caveat: If `this' is an abstract inherited member of origin, it is
2074 * deemed to override `other' only when `requireConcreteIfInherited'
2075 * is false.
2076 *
2077 * It is assumed that both symbols have the same name. The static
2078 * modifier is ignored for this test.
2079 *
2080 * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4
2081 */
2082 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult,
2083 boolean requireConcreteIfInherited) {
2084 if (isConstructor() || _other.kind != MTH) return false;
2085
2086 if (this == _other) return true;
2087 MethodSymbol other = (MethodSymbol)_other;
2088
2089 // check for a direct implementation
2090 if (other.isOverridableIn((TypeSymbol)owner) &&
2091 types.asSuper(owner.type, other.owner) != null) {
2092 Type mt = types.memberType(owner.type, this);
2093 Type ot = types.memberType(owner.type, other);
2094 if (types.isSubSignature(mt, ot)) {
2095 if (!checkResult)
2096 return true;
2097 if (types.returnTypeSubstitutable(mt, ot))
2098 return true;
2099 }
2100 }
2101
2102 // check for an inherited implementation
2103 if (((flags() & ABSTRACT) != 0 && requireConcreteIfInherited) ||
2104 ((other.flags() & ABSTRACT) == 0 && (other.flags() & DEFAULT) == 0) ||
2105 !other.isOverridableIn(origin) ||
2106 !this.isMemberOf(origin, types))
2107 return false;
2108
2109 // assert types.asSuper(origin.type, other.owner) != null;
2110 Type mt = types.memberType(origin.type, this);
2111 Type ot = types.memberType(origin.type, other);
2112 return
2113 types.isSubSignature(mt, ot) &&
2114 (!checkResult || types.resultSubtype(mt, ot, types.noWarnings));
2115 }
2116
2117 private boolean isOverridableIn(TypeSymbol origin) {
2118 // JLS 8.4.6.1
2119 switch ((int)(flags_field & Flags.AccessFlags)) {
2120 case Flags.PRIVATE:
2121 return false;
2122 case Flags.PUBLIC:
2123 return !this.owner.isInterface() ||
2124 (flags_field & STATIC) == 0;
2125 case Flags.PROTECTED:
2126 return (origin.flags() & INTERFACE) == 0;
2127 case 0:
2128 // for package private: can only override in the same
2129 // package
2130 return
2131 this.packge() == origin.packge() &&
2132 (origin.flags() & INTERFACE) == 0;
2133 default:
2134 return false;
2135 }
2136 }
2137
2138 @Override
2139 public boolean isInheritedIn(Symbol clazz, Types types) {
2140 switch ((int)(flags_field & Flags.AccessFlags)) {
2141 case PUBLIC:
2142 return !this.owner.isInterface() ||
2143 clazz == owner ||
2144 (flags_field & STATIC) == 0;
2145 default:
2146 return super.isInheritedIn(clazz, types);
2147 }
2148 }
2149
2150 public boolean isLambdaMethod() {
2151 return (flags() & LAMBDA_METHOD) == LAMBDA_METHOD;
2152 }
2153
2154 /** override this method to point to the original enclosing method if this method symbol represents a synthetic
2155 * lambda method
2156 */
2157 public MethodSymbol originalEnclosingMethod() {
2158 return this;
2159 }
2160
2161 /** The implementation of this (abstract) symbol in class origin;
2162 * null if none exists. Synthetic methods are not considered
2163 * as possible implementations.
2164 */
2165 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) {
2166 return implementation(origin, types, checkResult, implementation_filter);
2167 }
2168 // where
2169 public static final Predicate<Symbol> implementation_filter = s ->
2170 s.kind == MTH && (s.flags() & SYNTHETIC) == 0;
2171
2172 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult, Predicate<Symbol> implFilter) {
2173 MethodSymbol res = types.implementation(this, origin, checkResult, implFilter);
2174 if (res != null)
2175 return res;
2176 // if origin is derived from a raw type, we might have missed
2177 // an implementation because we do not know enough about instantiations.
2178 // in this case continue with the supertype as origin.
2179 if (types.isDerivedRaw(origin.type) && !origin.isInterface())
2180 return implementation(types.supertype(origin.type).tsym, types, checkResult);
2181 else
2182 return null;
2183 }
2184
2185 public List<VarSymbol> params() {
2186 owner.complete();
2187 if (params == null) {
2188 ListBuffer<VarSymbol> newParams = new ListBuffer<>();
2189 int i = 0;
2190 for (Type t : type.getParameterTypes()) {
2191 Name paramName = name.table.fromString("arg" + i);
2192 VarSymbol param = new VarSymbol(PARAMETER, paramName, t, this);
2193 newParams.append(param);
2194 i++;
2195 }
2196 params = newParams.toList();
2197 }
2198 Assert.checkNonNull(params);
2199 return params;
2200 }
2201
2202 public Symbol asMemberOf(Type site, Types types) {
2203 return new MethodSymbol(flags_field, name, types.memberType(site, this), owner);
2204 }
2205
2206 @DefinedBy(Api.LANGUAGE_MODEL)
2207 public ElementKind getKind() {
2208 if (name == name.table.names.init)
2209 return ElementKind.CONSTRUCTOR;
2210 else if (name == name.table.names.clinit)
2211 return ElementKind.STATIC_INIT;
2212 else if ((flags() & BLOCK) != 0)
2213 return isStatic() ? ElementKind.STATIC_INIT : ElementKind.INSTANCE_INIT;
2214 else
2215 return ElementKind.METHOD;
2216 }
2217
2218 public boolean isStaticOrInstanceInit() {
2219 return getKind() == ElementKind.STATIC_INIT ||
2220 getKind() == ElementKind.INSTANCE_INIT;
2221 }
2222
2223 @DefinedBy(Api.LANGUAGE_MODEL)
2224 public Attribute getDefaultValue() {
2225 return defaultValue;
2226 }
2227
2228 @DefinedBy(Api.LANGUAGE_MODEL)
2229 public List<VarSymbol> getParameters() {
2230 return params();
2231 }
2232
2233 @DefinedBy(Api.LANGUAGE_MODEL)
2234 public boolean isVarArgs() {
2235 return (flags() & VARARGS) != 0;
2236 }
2237
2238 @DefinedBy(Api.LANGUAGE_MODEL)
2239 public boolean isDefault() {
2240 return (flags() & DEFAULT) != 0;
2241 }
2242
2243 @DefinedBy(Api.LANGUAGE_MODEL)
2244 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
2245 return v.visitExecutable(this, p);
2246 }
2247
2248 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
2249 return v.visitMethodSymbol(this, p);
2250 }
2251
2252 @DefinedBy(Api.LANGUAGE_MODEL)
2253 public Type getReceiverType() {
2254 return asType().getReceiverType();
2255 }
2256
2257 @DefinedBy(Api.LANGUAGE_MODEL)
2258 public Type getReturnType() {
2259 return asType().getReturnType();
2260 }
2261
2262 @DefinedBy(Api.LANGUAGE_MODEL)
2263 public List<Type> getThrownTypes() {
2264 return asType().getThrownTypes();
2265 }
2266 }
2267
2268 /** A class for invokedynamic method calls.
2269 */
2270 public static class DynamicMethodSymbol extends MethodSymbol implements Dynamic {
2271
2272 public LoadableConstant[] staticArgs;
2273 public MethodHandleSymbol bsm;
2274
2275 public DynamicMethodSymbol(Name name, Symbol owner, MethodHandleSymbol bsm, Type type, LoadableConstant[] staticArgs) {
2276 super(0, name, type, owner);
2277 this.bsm = bsm;
2278 this.staticArgs = staticArgs;
2279 }
2280
2281 @Override
2282 public boolean isDynamic() {
2283 return true;
2284 }
2285
2286 @Override
2287 public LoadableConstant[] staticArgs() {
2288 return staticArgs;
2289 }
2290
2291 @Override
2292 public MethodHandleSymbol bootstrapMethod() {
2293 return bsm;
2294 }
2295
2296 @Override
2297 public int poolTag() {
2298 return ClassFile.CONSTANT_InvokeDynamic;
2299 }
2300
2301 @Override
2302 public Type dynamicType() {
2303 return type;
2304 }
2305 }
2306
2307 /** A class for condy.
2308 */
2309 public static class DynamicVarSymbol extends VarSymbol implements Dynamic, LoadableConstant {
2310 public LoadableConstant[] staticArgs;
2311 public MethodHandleSymbol bsm;
2312
2313 public DynamicVarSymbol(Name name, Symbol owner, MethodHandleSymbol bsm, Type type, LoadableConstant[] staticArgs) {
2314 super(0, name, type, owner);
2315 this.bsm = bsm;
2316 this.staticArgs = staticArgs;
2317 }
2318
2319 @Override
2320 public boolean isDynamic() {
2321 return true;
2322 }
2323
2324 @Override
2325 public PoolConstant dynamicType() {
2326 return type;
2327 }
2328
2329 @Override
2330 public LoadableConstant[] staticArgs() {
2331 return staticArgs;
2332 }
2333
2334 @Override
2335 public LoadableConstant bootstrapMethod() {
2336 return bsm;
2337 }
2338
2339 @Override
2340 public int poolTag() {
2341 return ClassFile.CONSTANT_Dynamic;
2342 }
2343 }
2344
2345 /** A class for method handles.
2346 */
2347 public static class MethodHandleSymbol extends MethodSymbol implements LoadableConstant {
2348
2349 private Symbol refSym;
2350 private boolean getter;
2351
2352 public MethodHandleSymbol(Symbol msym) {
2353 this(msym, false);
2354 }
2355
2356 public MethodHandleSymbol(Symbol msym, boolean getter) {
2357 super(msym.flags_field, msym.name, msym.type, msym.owner);
2358 this.refSym = msym;
2359 this.getter = getter;
2360 }
2361
2362 /**
2363 * Returns the kind associated with this method handle.
2364 */
2365 public int referenceKind() {
2366 if (refSym.kind == VAR) {
2367 return getter ?
2368 refSym.isStatic() ? ClassFile.REF_getStatic : ClassFile.REF_getField :
2369 refSym.isStatic() ? ClassFile.REF_putStatic : ClassFile.REF_putField;
2370 } else {
2371 if (refSym.isConstructor()) {
2372 return ClassFile.REF_newInvokeSpecial;
2373 } else {
2374 if (refSym.isStatic()) {
2375 return ClassFile.REF_invokeStatic;
2376 } else if ((refSym.flags() & PRIVATE) != 0 && !allowPrivateInvokeVirtual()) {
2377 return ClassFile.REF_invokeSpecial;
2378 } else if (refSym.enclClass().isInterface()) {
2379 return ClassFile.REF_invokeInterface;
2380 } else {
2381 return ClassFile.REF_invokeVirtual;
2382 }
2383 }
2384 }
2385 }
2386
2387 private boolean allowPrivateInvokeVirtual() {
2388 Symbol rootPack = this;
2389 while (rootPack != null && !(rootPack instanceof RootPackageSymbol)) {
2390 rootPack = rootPack.owner;
2391 }
2392 return rootPack != null && ((RootPackageSymbol) rootPack).allowPrivateInvokeVirtual;
2393 }
2394 @Override
2395 public int poolTag() {
2396 return ClassFile.CONSTANT_MethodHandle;
2397 }
2398
2399 @Override
2400 public Object poolKey(Types types) {
2401 return new Pair<>(baseSymbol(), referenceKind());
2402 }
2403
2404 @Override
2405 public MethodHandleSymbol asHandle() {
2406 return this;
2407 }
2408
2409 @Override
2410 public Symbol baseSymbol() {
2411 return refSym;
2412 }
2413
2414
2415 @Override
2416 public boolean isHandle() {
2417 return true;
2418 }
2419 }
2420
2421 /** A class for predefined operators.
2422 */
2423 public static class OperatorSymbol extends MethodSymbol {
2424
2425 public int opcode;
2426 private int accessCode = Integer.MIN_VALUE;
2427
2428 public OperatorSymbol(Name name, Type type, int opcode, Symbol owner) {
2429 super(PUBLIC | STATIC, name, type, owner);
2430 this.opcode = opcode;
2431 }
2432
2433 @Override
2434 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
2435 return v.visitOperatorSymbol(this, p);
2436 }
2437
2438 public int getAccessCode(Tag tag) {
2439 if (accessCode != Integer.MIN_VALUE && !tag.isIncOrDecUnaryOp()) {
2440 return accessCode;
2441 }
2442 accessCode = AccessCode.from(tag, opcode);
2443 return accessCode;
2444 }
2445
2446 /** Access codes for dereferencing, assignment,
2447 * and pre/post increment/decrement.
2448
2449 * All access codes for accesses to the current class are even.
2450 * If a member of the superclass should be accessed instead (because
2451 * access was via a qualified super), add one to the corresponding code
2452 * for the current class, making the number odd.
2453 * This numbering scheme is used by the backend to decide whether
2454 * to issue an invokevirtual or invokespecial call.
2455 *
2456 * @see Gen#visitSelect(JCFieldAccess tree)
2457 */
2458 public enum AccessCode {
2459 UNKNOWN(-1, Tag.NO_TAG),
2460 DEREF(0, Tag.NO_TAG),
2461 ASSIGN(2, Tag.ASSIGN),
2462 PREINC(4, Tag.PREINC),
2463 PREDEC(6, Tag.PREDEC),
2464 POSTINC(8, Tag.POSTINC),
2465 POSTDEC(10, Tag.POSTDEC),
2466 FIRSTASGOP(12, Tag.NO_TAG);
2467
2468 public final int code;
2469 public final Tag tag;
2470 public static final int numberOfAccessCodes = (lushrl - ishll + lxor + 2 - iadd) * 2 + FIRSTASGOP.code + 2;
2471
2472 AccessCode(int code, Tag tag) {
2473 this.code = code;
2474 this.tag = tag;
2475 }
2476
2477 public static AccessCode getFromCode(int code) {
2478 for (AccessCode aCodes : AccessCode.values()) {
2479 if (aCodes.code == code) {
2480 return aCodes;
2481 }
2482 }
2483 return UNKNOWN;
2484 }
2485
2486 static int from(Tag tag, int opcode) {
2487 /** Map bytecode of binary operation to access code of corresponding
2488 * assignment operation. This is always an even number.
2489 */
2490 switch (tag) {
2491 case PREINC:
2492 return AccessCode.PREINC.code;
2493 case PREDEC:
2494 return AccessCode.PREDEC.code;
2495 case POSTINC:
2496 return AccessCode.POSTINC.code;
2497 case POSTDEC:
2498 return AccessCode.POSTDEC.code;
2499 }
2500 if (iadd <= opcode && opcode <= lxor) {
2501 return (opcode - iadd) * 2 + FIRSTASGOP.code;
2502 } else if (opcode == string_add) {
2503 return (lxor + 1 - iadd) * 2 + FIRSTASGOP.code;
2504 } else if (ishll <= opcode && opcode <= lushrl) {
2505 return (opcode - ishll + lxor + 2 - iadd) * 2 + FIRSTASGOP.code;
2506 }
2507 return -1;
2508 }
2509 }
2510 }
2511
2512 /** Symbol completer interface.
2513 */
2514 public static interface Completer {
2515
2516 /** Dummy completer to be used when the symbol has been completed or
2517 * does not need completion.
2518 */
2519 public static final Completer NULL_COMPLETER = new Completer() {
2520 public void complete(Symbol sym) { }
2521 public boolean isTerminal() { return true; }
2522 };
2523
2524 void complete(Symbol sym) throws CompletionFailure;
2525
2526 /** Returns true if this completer is <em>terminal</em>. A terminal
2527 * completer is used as a place holder when the symbol is completed.
2528 * Calling complete on a terminal completer will not affect the symbol.
2529 *
2530 * The dummy NULL_COMPLETER and the GraphDependencies completer are
2531 * examples of terminal completers.
2532 *
2533 * @return true iff this completer is terminal
2534 */
2535 default boolean isTerminal() {
2536 return false;
2537 }
2538 }
2539
2540 public static class CompletionFailure extends RuntimeException {
2541 private static final long serialVersionUID = 0;
2542 public final transient DeferredCompletionFailureHandler dcfh;
2543 public transient Symbol sym;
2544
2545 /** A diagnostic object describing the failure
2546 */
2547 private transient JCDiagnostic diag;
2548
2549 private transient Supplier<JCDiagnostic> diagSupplier;
2550
2551 public CompletionFailure(Symbol sym, Supplier<JCDiagnostic> diagSupplier, DeferredCompletionFailureHandler dcfh) {
2552 this.dcfh = dcfh;
2553 this.sym = sym;
2554 this.diagSupplier = diagSupplier;
2555 // this.printStackTrace();//DEBUG
2556 }
2557
2558 public JCDiagnostic getDiagnostic() {
2559 if (diag == null && diagSupplier != null) {
2560 diag = diagSupplier.get();
2561 }
2562 return diag;
2563 }
2564
2565 @Override
2566 public String getMessage() {
2567 return getDiagnostic().getMessage(null);
2568 }
2569
2570 public JCDiagnostic getDetailValue() {
2571 return getDiagnostic();
2572 }
2573
2574 @Override
2575 public CompletionFailure initCause(Throwable cause) {
2576 super.initCause(cause);
2577 return this;
2578 }
2579
2580 public void resetDiagnostic(Supplier<JCDiagnostic> diagSupplier) {
2581 this.diagSupplier = diagSupplier;
2582 this.diag = null;
2583 }
2584
2585 }
2586
2587 /**
2588 * A visitor for symbols. A visitor is used to implement operations
2589 * (or relations) on symbols. Most common operations on types are
2590 * binary relations and this interface is designed for binary
2591 * relations, that is, operations on the form
2592 * Symbol × P → R.
2593 * <!-- In plain text: Type x P -> R -->
2594 *
2595 * @param <R> the return type of the operation implemented by this
2596 * visitor; use Void if no return type is needed.
2597 * @param <P> the type of the second argument (the first being the
2598 * symbol itself) of the operation implemented by this visitor; use
2599 * Void if a second argument is not needed.
2600 */
2601 public interface Visitor<R,P> {
2602 R visitClassSymbol(ClassSymbol s, P arg);
2603 R visitMethodSymbol(MethodSymbol s, P arg);
2604 R visitPackageSymbol(PackageSymbol s, P arg);
2605 R visitOperatorSymbol(OperatorSymbol s, P arg);
2606 R visitVarSymbol(VarSymbol s, P arg);
2607 R visitTypeSymbol(TypeSymbol s, P arg);
2608 R visitSymbol(Symbol s, P arg);
2609 }
2610 }