1 /*
2 * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.code;
27
28 import java.lang.annotation.Annotation;
29 import java.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, enum or record,
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 | ENUM | RECORD | 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 8.4.8.1 (without transitivity) and 8.4.8.4
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 abstract static 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 findRecordComponentToRemove(JCVariableDecl var) {
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 toRemove = rc;
1514 }
1515 }
1516 return toRemove;
1517 }
1518
1519 /* creates a record component if non is related to the given variable and recreates a brand new one
1520 * in other case
1521 */
1522 public RecordComponent createRecordComponent(RecordComponent existing, JCVariableDecl rcDecl, VarSymbol varSym) {
1523 RecordComponent rc = null;
1524 if (existing != null) {
1525 recordComponents = List.filter(recordComponents, existing);
1526 recordComponents = recordComponents.append(rc = new RecordComponent(varSym, existing.ast, existing.isVarargs));
1527 } else {
1528 // Didn't find the record component: create one.
1529 recordComponents = recordComponents.append(rc = new RecordComponent(varSym, rcDecl));
1530 }
1531 return rc;
1532 }
1533
1534 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1535 public List<? extends RecordComponent> getRecordComponents() {
1536 return recordComponents;
1537 }
1538
1539 public void setRecordComponents(List<RecordComponent> recordComponents) {
1540 this.recordComponents = recordComponents;
1541 }
1542
1543 @DefinedBy(Api.LANGUAGE_MODEL)
1544 public NestingKind getNestingKind() {
1545 apiComplete();
1546 if (owner.kind == PCK)
1547 return NestingKind.TOP_LEVEL;
1548 else if (name.isEmpty())
1549 return NestingKind.ANONYMOUS;
1550 else if (owner.kind == MTH)
1551 return NestingKind.LOCAL;
1552 else
1553 return NestingKind.MEMBER;
1554 }
1555
1556 @Override
1557 protected <A extends Annotation> Attribute.Compound getAttribute(final Class<A> annoType) {
1558
1559 Attribute.Compound attrib = super.getAttribute(annoType);
1560
1561 boolean inherited = annoType.isAnnotationPresent(Inherited.class);
1562 if (attrib != null || !inherited)
1563 return attrib;
1564
1565 // Search supertypes
1566 ClassSymbol superType = getSuperClassToSearchForAnnotations();
1567 return superType == null ? null
1568 : superType.getAttribute(annoType);
1569 }
1570
1571 @DefinedBy(Api.LANGUAGE_MODEL)
1572 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1573 return v.visitType(this, p);
1574 }
1575
1576 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
1577 return v.visitClassSymbol(this, p);
1578 }
1579
1580 public void markAbstractIfNeeded(Types types) {
1581 if (types.enter.getEnv(this) != null &&
1582 (flags() & ENUM) != 0 && types.supertype(type).tsym == types.syms.enumSym &&
1583 (flags() & (FINAL | ABSTRACT)) == 0) {
1584 if (types.firstUnimplementedAbstract(this) != null)
1585 // add the ABSTRACT flag to an enum
1586 flags_field |= ABSTRACT;
1587 }
1588 }
1589
1590 /**Resets the Symbol into the state good for next round of annotation processing.*/
1591 public void reset() {
1592 kind = TYP;
1593 erasure_field = null;
1594 members_field = null;
1595 flags_field = 0;
1596 if (type instanceof ClassType classType) {
1597 classType.setEnclosingType(Type.noType);
1598 classType.rank_field = -1;
1599 classType.typarams_field = null;
1600 classType.allparams_field = null;
1601 classType.supertype_field = null;
1602 classType.interfaces_field = null;
1603 classType.all_interfaces_field = null;
1604 }
1605 clearAnnotationMetadata();
1606 }
1607
1608 public void clearAnnotationMetadata() {
1609 metadata = null;
1610 annotationTypeMetadata = AnnotationTypeMetadata.notAnAnnotationType();
1611 }
1612
1613 @Override
1614 public AnnotationTypeMetadata getAnnotationTypeMetadata() {
1615 return annotationTypeMetadata;
1616 }
1617
1618 @Override
1619 public boolean isAnnotationType() {
1620 return (flags_field & Flags.ANNOTATION) != 0;
1621 }
1622
1623 public void setAnnotationTypeMetadata(AnnotationTypeMetadata a) {
1624 Assert.checkNonNull(a);
1625 Assert.check(!annotationTypeMetadata.isMetadataForAnnotationType());
1626 this.annotationTypeMetadata = a;
1627 }
1628
1629 public boolean isRecord() {
1630 return (flags_field & RECORD) != 0;
1631 }
1632
1633 @DefinedBy(Api.LANGUAGE_MODEL)
1634 public List<Type> getPermittedSubclasses() {
1635 return permitted.map(s -> s.type);
1636 }
1637 }
1638
1639
1640 /** A class for variable symbols
1641 */
1642 public static class VarSymbol extends Symbol implements VariableElement {
1643
1644 /** The variable's declaration position.
1645 */
1646 public int pos = Position.NOPOS;
1647
1648 /** The variable's address. Used for different purposes during
1649 * flow analysis, translation and code generation.
1650 * Flow analysis:
1651 * If this is a blank final or local variable, its sequence number.
1652 * Translation:
1653 * If this is a private field, its access number.
1654 * Code generation:
1655 * If this is a local variable, its logical slot number.
1656 */
1657 public int adr = -1;
1658
1659 /** Construct a variable symbol, given its flags, name, type and owner.
1660 */
1661 public VarSymbol(long flags, Name name, Type type, Symbol owner) {
1662 super(VAR, flags, name, type, owner);
1663 }
1664
1665 @Override
1666 public int poolTag() {
1667 return ClassFile.CONSTANT_Fieldref;
1668 }
1669
1670 public MethodHandleSymbol asMethodHandle(boolean getter) {
1671 return new MethodHandleSymbol(this, getter);
1672 }
1673
1674 /** Clone this symbol with new owner.
1675 */
1676 public VarSymbol clone(Symbol newOwner) {
1677 VarSymbol v = new VarSymbol(flags_field, name, type, newOwner) {
1678 @Override
1679 public Symbol baseSymbol() {
1680 return VarSymbol.this;
1681 }
1682
1683 @Override
1684 public Object poolKey(Types types) {
1685 return new Pair<>(newOwner, baseSymbol());
1686 }
1687 };
1688 v.pos = pos;
1689 v.adr = adr;
1690 v.data = data;
1691 // System.out.println("clone " + v + " in " + newOwner);//DEBUG
1692 return v;
1693 }
1694
1695 public String toString() {
1696 return name.toString();
1697 }
1698
1699 public Symbol asMemberOf(Type site, Types types) {
1700 return new VarSymbol(flags_field, name, types.memberType(site, this), owner);
1701 }
1702
1703 @DefinedBy(Api.LANGUAGE_MODEL)
1704 public ElementKind getKind() {
1705 long flags = flags();
1706 if ((flags & PARAMETER) != 0) {
1707 if (isExceptionParameter())
1708 return ElementKind.EXCEPTION_PARAMETER;
1709 else
1710 return ElementKind.PARAMETER;
1711 } else if ((flags & ENUM) != 0) {
1712 return ElementKind.ENUM_CONSTANT;
1713 } else if (owner.kind == TYP || owner.kind == ERR) {
1714 return ElementKind.FIELD;
1715 } else if (isResourceVariable()) {
1716 return ElementKind.RESOURCE_VARIABLE;
1717 } else if ((flags & MATCH_BINDING) != 0) {
1718 ElementKind kind = ElementKind.BINDING_VARIABLE;
1719 return kind;
1720 } else {
1721 return ElementKind.LOCAL_VARIABLE;
1722 }
1723 }
1724
1725 @DefinedBy(Api.LANGUAGE_MODEL)
1726 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1727 return v.visitVariable(this, p);
1728 }
1729
1730 @DefinedBy(Api.LANGUAGE_MODEL)
1731 public Object getConstantValue() { // Mirror API
1732 return Constants.decode(getConstValue(), type);
1733 }
1734
1735 public void setLazyConstValue(final Env<AttrContext> env,
1736 final Attr attr,
1737 final JCVariableDecl variable)
1738 {
1739 setData((Callable<Object>)() -> attr.attribLazyConstantValue(env, variable, type));
1740 }
1741
1742 /**
1743 * The variable's constant value, if this is a constant.
1744 * Before the constant value is evaluated, it points to an
1745 * initializer environment. If this is not a constant, it can
1746 * be used for other stuff.
1747 */
1748 private Object data;
1749
1750 public boolean isExceptionParameter() {
1751 return data == ElementKind.EXCEPTION_PARAMETER;
1752 }
1753
1754 public boolean isResourceVariable() {
1755 return data == ElementKind.RESOURCE_VARIABLE;
1756 }
1757
1758 public Object getConstValue() {
1759 // TODO: Consider if getConstValue and getConstantValue can be collapsed
1760 if (data == ElementKind.EXCEPTION_PARAMETER ||
1761 data == ElementKind.RESOURCE_VARIABLE) {
1762 return null;
1763 } else if (data instanceof Callable<?> callableData) {
1764 // In this case, this is a final variable, with an as
1765 // yet unevaluated initializer.
1766 data = null; // to make sure we don't evaluate this twice.
1767 try {
1768 data = callableData.call();
1769 } catch (Exception ex) {
1770 throw new AssertionError(ex);
1771 }
1772 }
1773 return data;
1774 }
1775
1776 public void setData(Object data) {
1777 Assert.check(!(data instanceof Env<?>), this);
1778 this.data = data;
1779 }
1780
1781 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
1782 return v.visitVarSymbol(this, p);
1783 }
1784 }
1785
1786 public static class RecordComponent extends VarSymbol implements RecordComponentElement {
1787 public MethodSymbol accessor;
1788 public JCTree.JCMethodDecl accessorMeth;
1789
1790 /* if the user happens to erroneously declare two components with the same name, we need a way to differentiate
1791 * them, the code will fail anyway but we need to keep the information for better error recovery
1792 */
1793 private final int pos;
1794
1795 private final boolean isVarargs;
1796
1797 private JCVariableDecl ast;
1798
1799 /**
1800 * Construct a record component, given its flags, name, type and owner.
1801 */
1802 public RecordComponent(Name name, Type type, Symbol owner) {
1803 super(PUBLIC, name, type, owner);
1804 pos = -1;
1805 ast = null;
1806 isVarargs = false;
1807 }
1808
1809 public RecordComponent(VarSymbol field, JCVariableDecl ast) {
1810 this(field, ast, field.type.hasTag(TypeTag.ARRAY) && ((ArrayType)field.type).isVarargs());
1811 }
1812
1813 public RecordComponent(VarSymbol field, JCVariableDecl ast, boolean isVarargs) {
1814 super(PUBLIC, field.name, field.type, field.owner);
1815 this.ast = ast;
1816 this.pos = field.pos;
1817 /* it is better to store the original information for this one, instead of relying
1818 * on the info in the type of the symbol. This is because on the presence of APs
1819 * the symbol will be blown out and we won't be able to know if the original
1820 * record component was declared varargs or not.
1821 */
1822 this.isVarargs = isVarargs;
1823 }
1824
1825 public List<JCAnnotation> getOriginalAnnos() { return this.ast == null ? List.nil() : this.ast.mods.annotations; }
1826
1827 public JCVariableDecl declarationFor() { return this.ast; }
1828
1829 public boolean isVarargs() {
1830 return isVarargs;
1831 }
1832
1833 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1834 public ElementKind getKind() {
1835 return ElementKind.RECORD_COMPONENT;
1836 }
1837
1838 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1839 public ExecutableElement getAccessor() {
1840 return accessor;
1841 }
1842
1843 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1844 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1845 return v.visitRecordComponent(this, p);
1846 }
1847 }
1848
1849 public static class ParamSymbol extends VarSymbol {
1850 public ParamSymbol(long flags, Name name, Type type, Symbol owner) {
1851 super(flags, name, type, owner);
1852 }
1853
1854 @Override
1855 public Name getSimpleName() {
1856 if ((flags_field & NAME_FILLED) == 0) {
1857 flags_field |= NAME_FILLED;
1858 Symbol rootPack = this;
1859 while (rootPack != null && !(rootPack instanceof RootPackageSymbol)) {
1860 rootPack = rootPack.owner;
1861 }
1862 if (rootPack != null) {
1863 Name inferredName =
1864 ((RootPackageSymbol) rootPack).missingInfoHandler.getParameterName(this);
1865 if (inferredName != null) {
1866 this.name = inferredName;
1867 }
1868 }
1869 }
1870 return super.getSimpleName();
1871 }
1872
1873 }
1874
1875 public static class BindingSymbol extends VarSymbol {
1876
1877 public BindingSymbol(long flags, Name name, Type type, Symbol owner) {
1878 super(flags | Flags.HASINIT | Flags.MATCH_BINDING, name, type, owner);
1879 }
1880
1881 public boolean isAliasFor(BindingSymbol b) {
1882 return aliases().containsAll(b.aliases());
1883 }
1884
1885 List<BindingSymbol> aliases() {
1886 return List.of(this);
1887 }
1888
1889 public void preserveBinding() {
1890 flags_field |= Flags.MATCH_BINDING_TO_OUTER;
1891 }
1892
1893 public boolean isPreserved() {
1894 return (flags_field & Flags.MATCH_BINDING_TO_OUTER) != 0;
1895 }
1896 }
1897
1898 /** A class for method symbols.
1899 */
1900 public static class MethodSymbol extends Symbol implements ExecutableElement {
1901
1902 /** The code of the method. */
1903 public Code code = null;
1904
1905 /** The extra (synthetic/mandated) parameters of the method. */
1906 public List<VarSymbol> extraParams = List.nil();
1907
1908 /** The captured local variables in an anonymous class */
1909 public List<VarSymbol> capturedLocals = List.nil();
1910
1911 /** The parameters of the method. */
1912 public List<VarSymbol> params = null;
1913
1914 /** For an annotation type element, its default value if any.
1915 * The value is null if none appeared in the method
1916 * declaration.
1917 */
1918 public Attribute defaultValue = null;
1919
1920 /** Construct a method symbol, given its flags, name, type and owner.
1921 */
1922 public MethodSymbol(long flags, Name name, Type type, Symbol owner) {
1923 super(MTH, flags, name, type, owner);
1924 if (owner.type.hasTag(TYPEVAR)) Assert.error(owner + "." + name);
1925 }
1926
1927 /** Clone this symbol with new owner.
1928 */
1929 public MethodSymbol clone(Symbol newOwner) {
1930 MethodSymbol m = new MethodSymbol(flags_field, name, type, newOwner) {
1931 @Override
1932 public Symbol baseSymbol() {
1933 return MethodSymbol.this;
1934 }
1935
1936 @Override
1937 public Object poolKey(Types types) {
1938 return new Pair<>(newOwner, baseSymbol());
1939 }
1940 };
1941 m.code = code;
1942 return m;
1943 }
1944
1945 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1946 public Set<Modifier> getModifiers() {
1947 long flags = flags();
1948 return Flags.asModifierSet((flags & DEFAULT) != 0 ? flags & ~ABSTRACT : flags);
1949 }
1950
1951 /** The Java source which this symbol represents.
1952 */
1953 public String toString() {
1954 if ((flags() & BLOCK) != 0) {
1955 return owner.name.toString();
1956 } else {
1957 String s = (name == name.table.names.init)
1958 ? owner.name.toString()
1959 : name.toString();
1960 if (type != null) {
1961 if (type.hasTag(FORALL))
1962 s = "<" + ((ForAll)type).getTypeArguments() + ">" + s;
1963 s += "(" + type.argtypes((flags() & VARARGS) != 0) + ")";
1964 }
1965 return s;
1966 }
1967 }
1968
1969 @Override
1970 public int poolTag() {
1971 return owner.isInterface() ?
1972 ClassFile.CONSTANT_InterfaceMethodref : ClassFile.CONSTANT_Methodref;
1973 }
1974
1975 public boolean isHandle() {
1976 return false;
1977 }
1978
1979
1980 public MethodHandleSymbol asHandle() {
1981 return new MethodHandleSymbol(this);
1982 }
1983
1984 /** find a symbol that this (proxy method) symbol implements.
1985 * @param c The class whose members are searched for
1986 * implementations
1987 */
1988 public Symbol implemented(TypeSymbol c, Types types) {
1989 Symbol impl = null;
1990 for (List<Type> is = types.interfaces(c.type);
1991 impl == null && is.nonEmpty();
1992 is = is.tail) {
1993 TypeSymbol i = is.head.tsym;
1994 impl = implementedIn(i, types);
1995 if (impl == null)
1996 impl = implemented(i, types);
1997 }
1998 return impl;
1999 }
2000
2001 public Symbol implementedIn(TypeSymbol c, Types types) {
2002 Symbol impl = null;
2003 for (Symbol sym : c.members().getSymbolsByName(name)) {
2004 if (this.overrides(sym, (TypeSymbol)owner, types, true) &&
2005 // FIXME: I suspect the following requires a
2006 // subst() for a parametric return type.
2007 types.isSameType(type.getReturnType(),
2008 types.memberType(owner.type, sym).getReturnType())) {
2009 impl = sym;
2010 }
2011 }
2012 return impl;
2013 }
2014
2015 /** Will the erasure of this method be considered by the VM to
2016 * override the erasure of the other when seen from class `origin'?
2017 */
2018 public boolean binaryOverrides(Symbol _other, TypeSymbol origin, Types types) {
2019 if (isConstructor() || _other.kind != MTH) return false;
2020
2021 if (this == _other) return true;
2022 MethodSymbol other = (MethodSymbol)_other;
2023
2024 // check for a direct implementation
2025 if (other.isOverridableIn((TypeSymbol)owner) &&
2026 types.asSuper(owner.type, other.owner) != null &&
2027 types.isSameType(erasure(types), other.erasure(types)))
2028 return true;
2029
2030 // check for an inherited implementation
2031 return
2032 (flags() & ABSTRACT) == 0 &&
2033 other.isOverridableIn(origin) &&
2034 this.isMemberOf(origin, types) &&
2035 types.isSameType(erasure(types), other.erasure(types));
2036 }
2037
2038 /** The implementation of this (abstract) symbol in class origin,
2039 * from the VM's point of view, null if method does not have an
2040 * implementation in class.
2041 * @param origin The class of which the implementation is a member.
2042 */
2043 public MethodSymbol binaryImplementation(ClassSymbol origin, Types types) {
2044 for (TypeSymbol c = origin; c != null; c = types.supertype(c.type).tsym) {
2045 for (Symbol sym : c.members().getSymbolsByName(name)) {
2046 if (sym.kind == MTH &&
2047 ((MethodSymbol)sym).binaryOverrides(this, origin, types))
2048 return (MethodSymbol)sym;
2049 }
2050 }
2051 return null;
2052 }
2053
2054 /** Does this symbol override `other' symbol, when both are seen as
2055 * members of class `origin'? It is assumed that _other is a member
2056 * of origin.
2057 *
2058 * It is assumed that both symbols have the same name. The static
2059 * modifier is ignored for this test.
2060 *
2061 * A quirk in the works is that if the receiver is a method symbol for
2062 * an inherited abstract method we answer false summarily all else being
2063 * immaterial. Abstract "own" methods (i.e `this' is a direct member of
2064 * origin) don't get rejected as summarily and are put to test against the
2065 * suitable criteria.
2066 *
2067 * See JLS 8.4.8.1 (without transitivity) and 8.4.8.4
2068 */
2069 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult) {
2070 return overrides(_other, origin, types, checkResult, true);
2071 }
2072
2073 /** Does this symbol override `other' symbol, when both are seen as
2074 * members of class `origin'? It is assumed that _other is a member
2075 * of origin.
2076 *
2077 * Caveat: If `this' is an abstract inherited member of origin, it is
2078 * deemed to override `other' only when `requireConcreteIfInherited'
2079 * is false.
2080 *
2081 * It is assumed that both symbols have the same name. The static
2082 * modifier is ignored for this test.
2083 *
2084 * See JLS 8.4.8.1 (without transitivity) and 8.4.8.4
2085 */
2086 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult,
2087 boolean requireConcreteIfInherited) {
2088 if (isConstructor() || _other.kind != MTH) return false;
2089
2090 if (this == _other) return true;
2091 MethodSymbol other = (MethodSymbol)_other;
2092
2093 // check for a direct implementation
2094 if (other.isOverridableIn((TypeSymbol)owner) &&
2095 types.asSuper(owner.type, other.owner) != null) {
2096 Type mt = types.memberType(owner.type, this);
2097 Type ot = types.memberType(owner.type, other);
2098 if (types.isSubSignature(mt, ot)) {
2099 if (!checkResult)
2100 return true;
2101 if (types.returnTypeSubstitutable(mt, ot))
2102 return true;
2103 }
2104 }
2105
2106 // check for an inherited implementation
2107 if (((flags() & ABSTRACT) != 0 && requireConcreteIfInherited) ||
2108 ((other.flags() & ABSTRACT) == 0 && (other.flags() & DEFAULT) == 0) ||
2109 !other.isOverridableIn(origin) ||
2110 !this.isMemberOf(origin, types))
2111 return false;
2112
2113 // assert types.asSuper(origin.type, other.owner) != null;
2114 Type mt = types.memberType(origin.type, this);
2115 Type ot = types.memberType(origin.type, other);
2116 return
2117 types.isSubSignature(mt, ot) &&
2118 (!checkResult || types.resultSubtype(mt, ot, types.noWarnings));
2119 }
2120
2121 private boolean isOverridableIn(TypeSymbol origin) {
2122 // JLS 8.4.8.1
2123 switch ((int)(flags_field & Flags.AccessFlags)) {
2124 case Flags.PRIVATE:
2125 return false;
2126 case Flags.PUBLIC:
2127 return !this.owner.isInterface() ||
2128 (flags_field & STATIC) == 0;
2129 case Flags.PROTECTED:
2130 return (origin.flags() & INTERFACE) == 0;
2131 case 0:
2132 // for package private: can only override in the same
2133 // package
2134 return
2135 this.packge() == origin.packge() &&
2136 (origin.flags() & INTERFACE) == 0;
2137 default:
2138 return false;
2139 }
2140 }
2141
2142 @Override
2143 public boolean isInheritedIn(Symbol clazz, Types types) {
2144 switch ((int)(flags_field & Flags.AccessFlags)) {
2145 case PUBLIC:
2146 return !this.owner.isInterface() ||
2147 clazz == owner ||
2148 (flags_field & STATIC) == 0;
2149 default:
2150 return super.isInheritedIn(clazz, types);
2151 }
2152 }
2153
2154 public boolean isLambdaMethod() {
2155 return (flags() & LAMBDA_METHOD) == LAMBDA_METHOD;
2156 }
2157
2158 /** override this method to point to the original enclosing method if this method symbol represents a synthetic
2159 * lambda method
2160 */
2161 public MethodSymbol originalEnclosingMethod() {
2162 return this;
2163 }
2164
2165 /** The implementation of this (abstract) symbol in class origin;
2166 * null if none exists. Synthetic methods are not considered
2167 * as possible implementations.
2168 */
2169 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) {
2170 return implementation(origin, types, checkResult, implementation_filter);
2171 }
2172 // where
2173 public static final Predicate<Symbol> implementation_filter = s ->
2174 s.kind == MTH && (s.flags() & SYNTHETIC) == 0;
2175
2176 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult, Predicate<Symbol> implFilter) {
2177 MethodSymbol res = types.implementation(this, origin, checkResult, implFilter);
2178 if (res != null)
2179 return res;
2180 // if origin is derived from a raw type, we might have missed
2181 // an implementation because we do not know enough about instantiations.
2182 // in this case continue with the supertype as origin.
2183 if (types.isDerivedRaw(origin.type) && !origin.isInterface())
2184 return implementation(types.supertype(origin.type).tsym, types, checkResult);
2185 else
2186 return null;
2187 }
2188
2189 public List<VarSymbol> params() {
2190 owner.complete();
2191 if (params == null) {
2192 ListBuffer<VarSymbol> newParams = new ListBuffer<>();
2193 int i = 0;
2194 for (Type t : type.getParameterTypes()) {
2195 Name paramName = name.table.fromString("arg" + i);
2196 VarSymbol param = new VarSymbol(PARAMETER, paramName, t, this);
2197 newParams.append(param);
2198 i++;
2199 }
2200 params = newParams.toList();
2201 }
2202 Assert.checkNonNull(params);
2203 return params;
2204 }
2205
2206 public Symbol asMemberOf(Type site, Types types) {
2207 return new MethodSymbol(flags_field, name, types.memberType(site, this), owner);
2208 }
2209
2210 @DefinedBy(Api.LANGUAGE_MODEL)
2211 public ElementKind getKind() {
2212 if (name == name.table.names.init)
2213 return ElementKind.CONSTRUCTOR;
2214 else if (name == name.table.names.clinit)
2215 return ElementKind.STATIC_INIT;
2216 else if ((flags() & BLOCK) != 0)
2217 return isStatic() ? ElementKind.STATIC_INIT : ElementKind.INSTANCE_INIT;
2218 else
2219 return ElementKind.METHOD;
2220 }
2221
2222 public boolean isStaticOrInstanceInit() {
2223 return getKind() == ElementKind.STATIC_INIT ||
2224 getKind() == ElementKind.INSTANCE_INIT;
2225 }
2226
2227 @DefinedBy(Api.LANGUAGE_MODEL)
2228 public Attribute getDefaultValue() {
2229 return defaultValue;
2230 }
2231
2232 @DefinedBy(Api.LANGUAGE_MODEL)
2233 public List<VarSymbol> getParameters() {
2234 return params();
2235 }
2236
2237 @DefinedBy(Api.LANGUAGE_MODEL)
2238 public boolean isVarArgs() {
2239 return (flags() & VARARGS) != 0;
2240 }
2241
2242 @DefinedBy(Api.LANGUAGE_MODEL)
2243 public boolean isDefault() {
2244 return (flags() & DEFAULT) != 0;
2245 }
2246
2247 @DefinedBy(Api.LANGUAGE_MODEL)
2248 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
2249 return v.visitExecutable(this, p);
2250 }
2251
2252 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
2253 return v.visitMethodSymbol(this, p);
2254 }
2255
2256 @DefinedBy(Api.LANGUAGE_MODEL)
2257 public Type getReceiverType() {
2258 return asType().getReceiverType();
2259 }
2260
2261 @DefinedBy(Api.LANGUAGE_MODEL)
2262 public Type getReturnType() {
2263 return asType().getReturnType();
2264 }
2265
2266 @DefinedBy(Api.LANGUAGE_MODEL)
2267 public List<Type> getThrownTypes() {
2268 return asType().getThrownTypes();
2269 }
2270 }
2271
2272 /** A class for invokedynamic method calls.
2273 */
2274 public static class DynamicMethodSymbol extends MethodSymbol implements Dynamic {
2275
2276 public LoadableConstant[] staticArgs;
2277 public MethodHandleSymbol bsm;
2278
2279 public DynamicMethodSymbol(Name name, Symbol owner, MethodHandleSymbol bsm, Type type, LoadableConstant[] staticArgs) {
2280 super(0, name, type, owner);
2281 this.bsm = bsm;
2282 this.staticArgs = staticArgs;
2283 }
2284
2285 @Override
2286 public Name name() {
2287 return name;
2288 }
2289
2290 @Override
2291 public boolean isDynamic() {
2292 return true;
2293 }
2294
2295 @Override
2296 public LoadableConstant[] staticArgs() {
2297 return staticArgs;
2298 }
2299
2300 @Override
2301 public MethodHandleSymbol bootstrapMethod() {
2302 return bsm;
2303 }
2304
2305 @Override
2306 public int poolTag() {
2307 return ClassFile.CONSTANT_InvokeDynamic;
2308 }
2309
2310 @Override
2311 public Type dynamicType() {
2312 return type;
2313 }
2314 }
2315
2316 /** A class for condy.
2317 */
2318 public static class DynamicVarSymbol extends VarSymbol implements Dynamic, LoadableConstant {
2319 public LoadableConstant[] staticArgs;
2320 public MethodHandleSymbol bsm;
2321
2322 public DynamicVarSymbol(Name name, Symbol owner, MethodHandleSymbol bsm, Type type, LoadableConstant[] staticArgs) {
2323 super(0, name, type, owner);
2324 this.bsm = bsm;
2325 this.staticArgs = staticArgs;
2326 }
2327
2328 @Override
2329 public Name name() {
2330 return name;
2331 }
2332
2333 @Override
2334 public boolean isDynamic() {
2335 return true;
2336 }
2337
2338 @Override
2339 public PoolConstant dynamicType() {
2340 return type;
2341 }
2342
2343 @Override
2344 public LoadableConstant[] staticArgs() {
2345 return staticArgs;
2346 }
2347
2348 @Override
2349 public LoadableConstant bootstrapMethod() {
2350 return bsm;
2351 }
2352
2353 @Override
2354 public int poolTag() {
2355 return ClassFile.CONSTANT_Dynamic;
2356 }
2357 }
2358
2359 /** A class for method handles.
2360 */
2361 public static class MethodHandleSymbol extends MethodSymbol implements LoadableConstant {
2362
2363 private Symbol refSym;
2364 private boolean getter;
2365
2366 public MethodHandleSymbol(Symbol msym) {
2367 this(msym, false);
2368 }
2369
2370 public MethodHandleSymbol(Symbol msym, boolean getter) {
2371 super(msym.flags_field, msym.name, msym.type, msym.owner);
2372 this.refSym = msym;
2373 this.getter = getter;
2374 }
2375
2376 /**
2377 * Returns the kind associated with this method handle.
2378 */
2379 public int referenceKind() {
2380 if (refSym.kind == VAR) {
2381 return getter ?
2382 refSym.isStatic() ? ClassFile.REF_getStatic : ClassFile.REF_getField :
2383 refSym.isStatic() ? ClassFile.REF_putStatic : ClassFile.REF_putField;
2384 } else {
2385 if (refSym.isConstructor()) {
2386 return ClassFile.REF_newInvokeSpecial;
2387 } else {
2388 if (refSym.isStatic()) {
2389 return ClassFile.REF_invokeStatic;
2390 } else if ((refSym.flags() & PRIVATE) != 0 && !allowPrivateInvokeVirtual()) {
2391 return ClassFile.REF_invokeSpecial;
2392 } else if (refSym.enclClass().isInterface()) {
2393 return ClassFile.REF_invokeInterface;
2394 } else {
2395 return ClassFile.REF_invokeVirtual;
2396 }
2397 }
2398 }
2399 }
2400
2401 private boolean allowPrivateInvokeVirtual() {
2402 Symbol rootPack = this;
2403 while (rootPack != null && !(rootPack instanceof RootPackageSymbol)) {
2404 rootPack = rootPack.owner;
2405 }
2406 return rootPack != null && ((RootPackageSymbol) rootPack).allowPrivateInvokeVirtual;
2407 }
2408 @Override
2409 public int poolTag() {
2410 return ClassFile.CONSTANT_MethodHandle;
2411 }
2412
2413 @Override
2414 public Object poolKey(Types types) {
2415 return new Pair<>(baseSymbol(), referenceKind());
2416 }
2417
2418 @Override
2419 public MethodHandleSymbol asHandle() {
2420 return this;
2421 }
2422
2423 @Override
2424 public Symbol baseSymbol() {
2425 return refSym;
2426 }
2427
2428
2429 @Override
2430 public boolean isHandle() {
2431 return true;
2432 }
2433 }
2434
2435 /** A class for predefined operators.
2436 */
2437 public static class OperatorSymbol extends MethodSymbol {
2438
2439 public int opcode;
2440 private int accessCode = Integer.MIN_VALUE;
2441
2442 public OperatorSymbol(Name name, Type type, int opcode, Symbol owner) {
2443 super(PUBLIC | STATIC, name, type, owner);
2444 this.opcode = opcode;
2445 }
2446
2447 @Override
2448 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) {
2449 return v.visitOperatorSymbol(this, p);
2450 }
2451
2452 public int getAccessCode(Tag tag) {
2453 if (accessCode != Integer.MIN_VALUE && !tag.isIncOrDecUnaryOp()) {
2454 return accessCode;
2455 }
2456 accessCode = AccessCode.from(tag, opcode);
2457 return accessCode;
2458 }
2459
2460 /** Access codes for dereferencing, assignment,
2461 * and pre/post increment/decrement.
2462
2463 * All access codes for accesses to the current class are even.
2464 * If a member of the superclass should be accessed instead (because
2465 * access was via a qualified super), add one to the corresponding code
2466 * for the current class, making the number odd.
2467 * This numbering scheme is used by the backend to decide whether
2468 * to issue an invokevirtual or invokespecial call.
2469 *
2470 * @see Gen#visitSelect(JCFieldAccess tree)
2471 */
2472 public enum AccessCode {
2473 UNKNOWN(-1, Tag.NO_TAG),
2474 DEREF(0, Tag.NO_TAG),
2475 ASSIGN(2, Tag.ASSIGN),
2476 PREINC(4, Tag.PREINC),
2477 PREDEC(6, Tag.PREDEC),
2478 POSTINC(8, Tag.POSTINC),
2479 POSTDEC(10, Tag.POSTDEC),
2480 FIRSTASGOP(12, Tag.NO_TAG);
2481
2482 public final int code;
2483 public final Tag tag;
2484 public static final int numberOfAccessCodes = (lushrl - ishll + lxor + 2 - iadd) * 2 + FIRSTASGOP.code + 2;
2485
2486 AccessCode(int code, Tag tag) {
2487 this.code = code;
2488 this.tag = tag;
2489 }
2490
2491 public static AccessCode getFromCode(int code) {
2492 for (AccessCode aCodes : AccessCode.values()) {
2493 if (aCodes.code == code) {
2494 return aCodes;
2495 }
2496 }
2497 return UNKNOWN;
2498 }
2499
2500 static int from(Tag tag, int opcode) {
2501 /** Map bytecode of binary operation to access code of corresponding
2502 * assignment operation. This is always an even number.
2503 */
2504 switch (tag) {
2505 case PREINC:
2506 return AccessCode.PREINC.code;
2507 case PREDEC:
2508 return AccessCode.PREDEC.code;
2509 case POSTINC:
2510 return AccessCode.POSTINC.code;
2511 case POSTDEC:
2512 return AccessCode.POSTDEC.code;
2513 }
2514 if (iadd <= opcode && opcode <= lxor) {
2515 return (opcode - iadd) * 2 + FIRSTASGOP.code;
2516 } else if (opcode == string_add) {
2517 return (lxor + 1 - iadd) * 2 + FIRSTASGOP.code;
2518 } else if (ishll <= opcode && opcode <= lushrl) {
2519 return (opcode - ishll + lxor + 2 - iadd) * 2 + FIRSTASGOP.code;
2520 }
2521 return -1;
2522 }
2523 }
2524 }
2525
2526 /** Symbol completer interface.
2527 */
2528 public static interface Completer {
2529
2530 /** Dummy completer to be used when the symbol has been completed or
2531 * does not need completion.
2532 */
2533 public static final Completer NULL_COMPLETER = new Completer() {
2534 public void complete(Symbol sym) { }
2535 public boolean isTerminal() { return true; }
2536 };
2537
2538 void complete(Symbol sym) throws CompletionFailure;
2539
2540 /** Returns true if this completer is <em>terminal</em>. A terminal
2541 * completer is used as a place holder when the symbol is completed.
2542 * Calling complete on a terminal completer will not affect the symbol.
2543 *
2544 * The dummy NULL_COMPLETER and the GraphDependencies completer are
2545 * examples of terminal completers.
2546 *
2547 * @return true iff this completer is terminal
2548 */
2549 default boolean isTerminal() {
2550 return false;
2551 }
2552 }
2553
2554 public static class CompletionFailure extends RuntimeException {
2555 private static final long serialVersionUID = 0;
2556 public final transient DeferredCompletionFailureHandler dcfh;
2557 public transient Symbol sym;
2558
2559 /** A diagnostic object describing the failure
2560 */
2561 private transient JCDiagnostic diag;
2562
2563 private transient Supplier<JCDiagnostic> diagSupplier;
2564
2565 public CompletionFailure(Symbol sym, Supplier<JCDiagnostic> diagSupplier, DeferredCompletionFailureHandler dcfh) {
2566 this.dcfh = dcfh;
2567 this.sym = sym;
2568 this.diagSupplier = diagSupplier;
2569 // this.printStackTrace();//DEBUG
2570 }
2571
2572 public JCDiagnostic getDiagnostic() {
2573 if (diag == null && diagSupplier != null) {
2574 diag = diagSupplier.get();
2575 }
2576 return diag;
2577 }
2578
2579 @Override
2580 public String getMessage() {
2581 return getDiagnostic().getMessage(null);
2582 }
2583
2584 public JCDiagnostic getDetailValue() {
2585 return getDiagnostic();
2586 }
2587
2588 @Override
2589 public CompletionFailure initCause(Throwable cause) {
2590 super.initCause(cause);
2591 return this;
2592 }
2593
2594 public void resetDiagnostic(Supplier<JCDiagnostic> diagSupplier) {
2595 this.diagSupplier = diagSupplier;
2596 this.diag = null;
2597 }
2598
2599 }
2600
2601 /**
2602 * A visitor for symbols. A visitor is used to implement operations
2603 * (or relations) on symbols. Most common operations on types are
2604 * binary relations and this interface is designed for binary
2605 * relations, that is, operations on the form
2606 * Symbol × P → R.
2607 * <!-- In plain text: Type x P -> R -->
2608 *
2609 * @param <R> the return type of the operation implemented by this
2610 * visitor; use Void if no return type is needed.
2611 * @param <P> the type of the second argument (the first being the
2612 * symbol itself) of the operation implemented by this visitor; use
2613 * Void if a second argument is not needed.
2614 */
2615 public interface Visitor<R,P> {
2616 R visitClassSymbol(ClassSymbol s, P arg);
2617 R visitMethodSymbol(MethodSymbol s, P arg);
2618 R visitPackageSymbol(PackageSymbol s, P arg);
2619 R visitOperatorSymbol(OperatorSymbol s, P arg);
2620 R visitVarSymbol(VarSymbol s, P arg);
2621 R visitTypeSymbol(TypeSymbol s, P arg);
2622 R visitSymbol(Symbol s, P arg);
2623 }
2624 }