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