1 /*
2 * Copyright (c) 1999, 2026, 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.Retention;
29 import java.lang.annotation.RetentionPolicy;
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.ConcurrentHashMap;
35 import java.util.stream.Collectors;
36
37 import javax.lang.model.element.Modifier;
38
39 import com.sun.tools.javac.util.Assert;
40
41 /** Access flags and other modifiers for Java classes and members.
42 *
43 * <p><b>This is NOT part of any supported API.
44 * If you write code that depends on this, you do so at your own risk.
45 * This code and its internal interfaces are subject to change or
46 * deletion without notice.</b>
47 */
48 public class Flags {
49
50 private Flags() {} // uninstantiable
51
52 public static String toString(long flags) {
53 StringBuilder buf = new StringBuilder();
54 String sep = "";
55 for (FlagsEnum flag : asFlagSet(flags)) {
56 buf.append(sep);
57 buf.append(flag);
58 sep = " ";
59 }
60 return buf.toString();
61 }
62
63 public static EnumSet<FlagsEnum> asFlagSet(long flags) {
64 EnumSet<FlagsEnum> flagSet = EnumSet.noneOf(FlagsEnum.class);
65 for (FlagsEnum flag : FlagsEnum.values()) {
66 if ((flags & flag.value()) != 0) {
67 flagSet.add(flag);
68 flags &= ~flag.value();
69 }
70 }
71 Assert.check(flags == 0);
72 return flagSet;
73 }
74
75 /* Standard Java flags.
76 */
77 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.VARIABLE})
78 public static final int PUBLIC = 1;
79 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.VARIABLE})
80 public static final int PRIVATE = 1<<1;
81 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.VARIABLE})
82 public static final int PROTECTED = 1<<2;
83 @Use({FlagTarget.BLOCK, FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.VARIABLE})
84 public static final int STATIC = 1<<3;
85 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.VARIABLE})
86 public static final int FINAL = 1<<4;
87 @Use({FlagTarget.METHOD})
88 public static final int SYNCHRONIZED = 1<<5;
89 @Use({FlagTarget.VARIABLE})
90 public static final int VOLATILE = 1<<6;
91 @Use({FlagTarget.VARIABLE})
92 public static final int TRANSIENT = 1<<7;
93 @Use({FlagTarget.METHOD})
94 public static final int NATIVE = 1<<8;
95 @Use({FlagTarget.CLASS})
96 public static final int INTERFACE = 1<<9;
97 @Use({FlagTarget.CLASS, FlagTarget.METHOD})
98 public static final int ABSTRACT = 1<<10;
99 @Use({FlagTarget.CLASS, FlagTarget.METHOD})
100 public static final int STRICTFP = 1<<11;
101
102 /* Flag that marks a symbol synthetic, added in classfile v49.0. */
103 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.VARIABLE})
104 public static final int SYNTHETIC = 1<<12;
105
106 /** Flag that marks attribute interfaces, added in classfile v49.0. */
107 @Use({FlagTarget.CLASS})
108 public static final int ANNOTATION = 1<<13;
109
110 /** An enumeration type or an enumeration constant, added in
111 * classfile v49.0. */
112 @Use({FlagTarget.CLASS, FlagTarget.VARIABLE})
113 public static final int ENUM = 1<<14;
114
115 /** Added in SE8, represents constructs implicitly declared in source. */
116 @Use({FlagTarget.MODULE, FlagTarget.VARIABLE})
117 public static final int MANDATED = 1<<15;
118
119 @NotFlag
120 public static final int StandardFlags = 0x0fff;
121
122 // Because the following access flags are overloaded with other
123 // bit positions, we translate them when reading and writing class
124 // files into unique bits positions: ACC_SYNTHETIC <-> SYNTHETIC,
125 // for example.
126 @Use({FlagTarget.CLASS})
127 @NoToStringValue
128 public static final int ACC_SUPER = 1<<5;
129 @Use({FlagTarget.METHOD})
130 @NoToStringValue
131 public static final int ACC_BRIDGE = 1<<6;
132 @Use({FlagTarget.METHOD})
133 @NoToStringValue
134 public static final int ACC_VARARGS = 1<<7;
135 @Use({FlagTarget.CLASS})
136 @NoToStringValue
137 public static final int ACC_MODULE = 1<<15;
138
139 /* ***************************************
140 * Internal compiler flags (no bits in the lower 16).
141 *****************************************/
142
143 /** Flag is set if symbol is deprecated. See also DEPRECATED_REMOVAL.
144 */
145 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
146 public static final int DEPRECATED = 1<<17;
147
148 /** Flag is set for a variable symbol if the variable's definition
149 * has an initializer part.
150 */
151 @Use({FlagTarget.VARIABLE})
152 public static final int HASINIT = 1<<18;
153
154 /** Class is an implicitly declared top level class.
155 */
156 @Use({FlagTarget.CLASS})
157 public static final int IMPLICIT_CLASS = 1<<19;
158
159 /** Variable with implicit/inferred type.
160 */
161 @Use(FlagTarget.VARIABLE)
162 public static final int VAR_VARIABLE = 1<<19;
163
164 /** Flag is set for compiler-generated anonymous method symbols
165 * that `own' an initializer block.
166 */
167 @Use({FlagTarget.METHOD})
168 public static final int BLOCK = 1<<20;
169
170 /** A parameter of a lambda function.
171 */
172 @Use(FlagTarget.VARIABLE)
173 public static final int LAMBDA_PARAMETER = 1<<20;
174
175 /** Flag is set for ClassSymbols that are being compiled from source.
176 */
177 @Use({FlagTarget.CLASS})
178 public static final int FROM_SOURCE = 1<<21;
179
180 /** Flag is set for nested classes that do not access instance members
181 * or `this' of an outer class and therefore don't need to be passed
182 * a this$n reference. This value is currently set only for anonymous
183 * classes in superclass constructor calls.
184 * todo: use this value for optimizing away this$n parameters in
185 * other cases.
186 */
187 @Use({FlagTarget.CLASS, FlagTarget.VARIABLE})
188 public static final int NOOUTERTHIS = 1<<22;
189
190 /** Flag is set for package symbols if a package has a member or
191 * directory and therefore exists.
192 */
193 @Use({FlagTarget.CLASS, FlagTarget.PACKAGE})
194 public static final int EXISTS = 1<<23;
195
196 /** Flag is set for compiler-generated compound classes
197 * representing multiple variable bounds
198 */
199 @Use({FlagTarget.CLASS})
200 public static final int COMPOUND = 1<<24;
201
202 /** Flag is set for class symbols if a class file was found for this class.
203 */
204 @Use({FlagTarget.CLASS})
205 public static final int CLASS_SEEN = 1<<25;
206
207 /** Flag is set for class symbols if a source file was found for this
208 * class.
209 */
210 @Use({FlagTarget.CLASS})
211 public static final int SOURCE_SEEN = 1<<26;
212
213 /* State flags (are reset during compilation).
214 */
215
216 /** Flag for class symbols is set and later re-set as a lock in
217 * Enter to detect cycles in the superclass/superinterface
218 * relations. Similarly for constructor call cycle detection in
219 * Attr.
220 */
221 @Use({FlagTarget.CLASS, FlagTarget.METHOD})
222 public static final int LOCKED = 1<<27;
223
224 /** Flag for class symbols is set and later re-set to indicate that a class
225 * has been entered but has not yet been attributed.
226 */
227 @Use({FlagTarget.CLASS})
228 public static final int UNATTRIBUTED = 1<<28;
229
230 /** Flag for synthesized default constructors of anonymous classes.
231 */
232 @Use({FlagTarget.METHOD})
233 public static final int ANONCONSTR = 1<<29;
234
235 /**
236 * Flag to indicate the superclasses of this ClassSymbol has been attributed.
237 */
238 @Use({FlagTarget.CLASS})
239 public static final int SUPER_OWNER_ATTRIBUTED = 1<<29;
240
241 /** Flag for class symbols to indicate it has been checked and found
242 * acyclic.
243 */
244 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.TYPE_VAR})
245 public static final int ACYCLIC = 1<<30;
246
247 /** Flag that marks bridge methods.
248 */
249 @Use({FlagTarget.METHOD})
250 public static final long BRIDGE = 1L<<31;
251
252 /** Flag that marks formal parameters.
253 */
254 @Use({FlagTarget.VARIABLE})
255 public static final long PARAMETER = 1L<<33;
256
257 /** Flag that marks varargs methods.
258 */
259 @Use({FlagTarget.METHOD, FlagTarget.VARIABLE})
260 public static final long VARARGS = 1L<<34;
261
262 /** Flag for annotation type symbols to indicate it has been
263 * checked and found acyclic.
264 */
265 @Use({FlagTarget.CLASS})
266 public static final long ACYCLIC_ANN = 1L<<35;
267
268 /** Flag that marks a generated default constructor.
269 */
270 @Use({FlagTarget.METHOD})
271 public static final long GENERATEDCONSTR = 1L<<36;
272
273 /** Flag that marks a hypothetical method that need not really be
274 * generated in the binary, but is present in the symbol table to
275 * simplify checking for erasure clashes - also used for 292 poly sig methods.
276 */
277 @Use({FlagTarget.METHOD})
278 public static final long HYPOTHETICAL = 1L<<37;
279
280 /**
281 * Flag that marks an internal proprietary class.
282 */
283 @Use({FlagTarget.CLASS})
284 public static final long PROPRIETARY = 1L<<38;
285
286 /**
287 * Flag that marks a multi-catch parameter.
288 */
289 @Use({FlagTarget.VARIABLE})
290 public static final long UNION = 1L<<39;
291
292 /**
293 * Flags an erroneous TypeSymbol as viable for recovery.
294 * TypeSymbols only.
295 */
296 @Use({FlagTarget.CLASS, FlagTarget.TYPE_VAR})
297 public static final long RECOVERABLE = 1L<<40;
298
299 /**
300 * Flag that marks an 'effectively final' local variable.
301 */
302 @Use({FlagTarget.VARIABLE})
303 public static final long EFFECTIVELY_FINAL = 1L<<41;
304
305 /**
306 * Flag that marks non-override equivalent methods with the same signature,
307 * or a conflicting match binding (BindingSymbol).
308 */
309 @Use({FlagTarget.METHOD, FlagTarget.VARIABLE})
310 public static final long CLASH = 1L<<42;
311
312 /**
313 * Flag that marks either a default method or an interface containing default methods.
314 */
315 @Use({FlagTarget.CLASS, FlagTarget.METHOD})
316 public static final long DEFAULT = 1L<<43; // part of ExtendedStandardFlags, cannot be reused
317
318 /**
319 * Flag that marks class as auxiliary, ie a non-public class following
320 * the public class in a source file, that could block implicit compilation.
321 */
322 @Use({FlagTarget.CLASS})
323 public static final long AUXILIARY = 1L<<44;
324
325 /**
326 * Flag that marks that a symbol is not available in the current profile
327 */
328 @Use({FlagTarget.CLASS})
329 public static final long NOT_IN_PROFILE = 1L<<45;
330
331 /**
332 * Flag that indicates that an override error has been detected by Check.
333 */
334 @Use({FlagTarget.METHOD})
335 public static final long BAD_OVERRIDE = 1L<<45;
336
337 /**
338 * Flag that indicates a signature polymorphic method (292).
339 */
340 @Use({FlagTarget.METHOD})
341 public static final long SIGNATURE_POLYMORPHIC = 1L<<46;
342
343 /**
344 * Flag that indicates that an inference variable is used in a 'throws' clause.
345 */
346 @Use({FlagTarget.TYPE_VAR})
347 public static final long THROWS = 1L<<47;
348
349 /**
350 * Flag to indicate sealed class/interface declaration.
351 */
352 @Use({FlagTarget.CLASS})
353 public static final long SEALED = 1L<<48; // part of ExtendedStandardFlags, cannot be reused
354
355 /**
356 * Flag that marks a synthetic method body for a lambda expression
357 */
358 @Use({FlagTarget.METHOD})
359 public static final long LAMBDA_METHOD = 1L<<49;
360
361 /**
362 * Flag that marks a synthetic local capture field in a local/anon class
363 */
364 @Use({FlagTarget.VARIABLE})
365 public static final long LOCAL_CAPTURE_FIELD = 1L<<49;
366
367 /**
368 * Flag to control recursion in TransTypes
369 */
370 @Use({FlagTarget.CLASS})
371 public static final long TYPE_TRANSLATED = 1L<<50;
372
373 /**
374 * Flag to indicate class symbol is for module-info
375 */
376 @Use({FlagTarget.CLASS})
377 public static final long MODULE = 1L<<51;
378
379 /**
380 * Flag to indicate the given ModuleSymbol is an automatic module.
381 */
382 @Use({FlagTarget.MODULE})
383 public static final long AUTOMATIC_MODULE = 1L<<52;
384
385 /**
386 * Flag to indicate the given PackageSymbol contains any non-.java and non-.class resources.
387 */
388 @Use({FlagTarget.PACKAGE})
389 public static final long HAS_RESOURCE = 1L<<52;
390
391 /**
392 * Flag to indicate the given ParamSymbol has a user-friendly name filled.
393 */
394 @Use({FlagTarget.VARIABLE}) //ParamSymbols only
395 public static final long NAME_FILLED = 1L<<52;
396
397 /**
398 * Flag to indicate the given ModuleSymbol is a system module.
399 */
400 @Use({FlagTarget.MODULE})
401 public static final long SYSTEM_MODULE = 1L<<53;
402
403 /**
404 * Flag to indicate the given ClassSymbol is a value based.
405 */
406 @Use({FlagTarget.CLASS})
407 public static final long VALUE_BASED = 1L<<53;
408
409 /**
410 * Flag to indicate the given symbol has a @Deprecated annotation.
411 */
412 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
413 public static final long DEPRECATED_ANNOTATION = 1L<<54;
414
415 /**
416 * Flag to indicate the given symbol has been deprecated and marked for removal.
417 */
418 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
419 public static final long DEPRECATED_REMOVAL = 1L<<55;
420
421 /**
422 * Flag to indicate the API element in question is for a preview API.
423 */
424 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
425 public static final long PREVIEW_API = 1L<<56; //any Symbol kind
426
427 /**
428 * Flag for synthesized default constructors of anonymous classes that have an enclosing expression.
429 */
430 @Use({FlagTarget.METHOD})
431 public static final long ANONCONSTR_BASED = 1L<<57;
432
433 /**
434 * Flag that marks finalize block as body-only, should not be copied into catch clauses.
435 * Used to implement try-with-resources.
436 */
437 @Use({FlagTarget.BLOCK})
438 public static final long BODY_ONLY_FINALIZE = 1L<<17;
439
440 /**
441 * Flag to indicate the API element in question is for a preview API.
442 */
443 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
444 public static final long PREVIEW_REFLECTIVE = 1L<<58; //any Symbol kind
445
446 /**
447 * Flag to indicate the given variable is a match binding variable.
448 */
449 @Use({FlagTarget.VARIABLE})
450 public static final long MATCH_BINDING = 1L<<59;
451
452 /**
453 * A flag to indicate a match binding variable whose scope extends after the current statement.
454 */
455 @Use({FlagTarget.VARIABLE})
456 public static final long MATCH_BINDING_TO_OUTER = 1L<<60;
457
458 /**
459 * Flag to indicate that a class is a record. The flag is also used to mark fields that are
460 * part of the state vector of a record and to mark the canonical constructor
461 */
462 @Use({FlagTarget.CLASS, FlagTarget.VARIABLE, FlagTarget.METHOD})
463 public static final long RECORD = 1L<<61;
464
465 /**
466 * Flag to mark a record constructor as a compact one
467 */
468 @Use({FlagTarget.METHOD})
469 public static final long COMPACT_RECORD_CONSTRUCTOR = 1L<<51;
470
471 /**
472 * Flag to mark a record field that was not initialized in the compact constructor
473 */
474 @Use({FlagTarget.VARIABLE})
475 public static final long UNINITIALIZED_FIELD= 1L<<51;
476
477 /** Flag is set for compiler-generated record members, it could be applied to
478 * accessors and fields
479 */
480 @Use({FlagTarget.METHOD, FlagTarget.VARIABLE})
481 public static final int GENERATED_MEMBER = 1<<24;
482
483 /**
484 * Flag to indicate restricted method declaration.
485 */
486 @Use({FlagTarget.METHOD})
487 public static final long RESTRICTED = 1L<<62;
488
489 /**
490 * Flag to indicate parameters that require identity.
491 */
492 @Use({FlagTarget.VARIABLE}) //ParamSymbols only
493 public static final long REQUIRES_IDENTITY = 1L<<62;
494
495 /**
496 * Flag to indicate type annotations have been queued for field initializers.
497 */
498 @Use({FlagTarget.VARIABLE})
499 public static final long FIELD_INIT_TYPE_ANNOTATIONS_QUEUED = 1L<<53;
500
501 /**
502 * Flag to indicate that the class/interface was declared with the non-sealed modifier.
503 */
504 @Use({FlagTarget.CLASS})
505 @CustomToStringValue("non-sealed")
506 public static final long NON_SEALED = 1L<<63; // part of ExtendedStandardFlags, cannot be reused
507
508 /**
509 * Describe modifier flags as they might appear in source code, i.e.,
510 * separated by spaces and in the order suggested by JLS 8.1.1.
511 */
512 public static String toSource(long flags) {
513 return asModifierSet(flags).stream()
514 .map(Modifier::toString)
515 .collect(Collectors.joining(" "));
516 }
517
518 /** Modifier masks.
519 */
520 @NotFlag
521 public static final int
522 AccessFlags = PUBLIC | PROTECTED | PRIVATE,
523 LocalClassFlags = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC,
524 StaticLocalFlags = LocalClassFlags | STATIC | INTERFACE,
525 MemberClassFlags = LocalClassFlags | INTERFACE | AccessFlags,
526 MemberStaticClassFlags = MemberClassFlags | STATIC,
527 ClassFlags = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,
528 InterfaceVarFlags = FINAL | STATIC | PUBLIC,
529 VarFlags = AccessFlags | FINAL | STATIC |
530 VOLATILE | TRANSIENT | ENUM,
531 ConstructorFlags = AccessFlags,
532 InterfaceMethodFlags = ABSTRACT | PUBLIC,
533 MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE |
534 SYNCHRONIZED | FINAL | STRICTFP,
535 RecordMethodFlags = AccessFlags | ABSTRACT | STATIC |
536 SYNCHRONIZED | FINAL | STRICTFP;
537 @NotFlag
538 public static final long
539 //NOTE: flags in ExtendedStandardFlags cannot be overlayed across Symbol kinds:
540 ExtendedStandardFlags = (long)StandardFlags | DEFAULT | SEALED | NON_SEALED,
541 ExtendedMemberClassFlags = (long)MemberClassFlags | SEALED | NON_SEALED,
542 ExtendedMemberStaticClassFlags = (long) MemberStaticClassFlags | SEALED | NON_SEALED,
543 ExtendedClassFlags = (long)ClassFlags | SEALED | NON_SEALED,
544 ModifierFlags = ((long)StandardFlags & ~INTERFACE) | DEFAULT | SEALED | NON_SEALED,
545 InterfaceMethodMask = ABSTRACT | PRIVATE | STATIC | PUBLIC | STRICTFP | DEFAULT,
546 AnnotationTypeElementMask = ABSTRACT | PUBLIC,
547 LocalVarFlags = FINAL | PARAMETER,
548 ReceiverParamFlags = PARAMETER;
549
550 public static Set<Modifier> asModifierSet(long flags) {
551 Set<Modifier> modifiers = modifierSets.get(flags);
552 if (modifiers == null) {
553 modifiers = java.util.EnumSet.noneOf(Modifier.class);
554 if (0 != (flags & PUBLIC)) modifiers.add(Modifier.PUBLIC);
555 if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED);
556 if (0 != (flags & PRIVATE)) modifiers.add(Modifier.PRIVATE);
557 if (0 != (flags & ABSTRACT)) modifiers.add(Modifier.ABSTRACT);
558 if (0 != (flags & STATIC)) modifiers.add(Modifier.STATIC);
559 if (0 != (flags & SEALED)) modifiers.add(Modifier.SEALED);
560 if (0 != (flags & NON_SEALED))
561 modifiers.add(Modifier.NON_SEALED);
562 if (0 != (flags & FINAL)) modifiers.add(Modifier.FINAL);
563 if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT);
564 if (0 != (flags & VOLATILE)) modifiers.add(Modifier.VOLATILE);
565 if (0 != (flags & SYNCHRONIZED))
566 modifiers.add(Modifier.SYNCHRONIZED);
567 if (0 != (flags & NATIVE)) modifiers.add(Modifier.NATIVE);
568 if (0 != (flags & STRICTFP)) modifiers.add(Modifier.STRICTFP);
569 if (0 != (flags & DEFAULT)) modifiers.add(Modifier.DEFAULT);
570 modifiers = Collections.unmodifiableSet(modifiers);
571 modifierSets.put(flags, modifiers);
572 }
573 return modifiers;
574 }
575
576 // Cache of modifier sets.
577 private static final Map<Long, Set<Modifier>> modifierSets = new ConcurrentHashMap<>(64);
578
579 public static boolean isStatic(Symbol symbol) {
580 return (symbol.flags() & STATIC) != 0;
581 }
582
583 public static boolean isEnum(Symbol symbol) {
584 return (symbol.flags() & ENUM) != 0;
585 }
586
587 public static boolean isConstant(Symbol.VarSymbol symbol) {
588 return symbol.getConstValue() != null;
589 }
590
591 public enum FlagTarget {
592 /** This flag can appear the JCBlock.
593 */
594 BLOCK,
595 /** This flag can appear on ClassSymbols.
596 */
597 CLASS,
598 /** This flag can appear on ModuleSymbols.
599 */
600 MODULE,
601 /** This flag can appear on PackageSymbols.
602 */
603 PACKAGE,
604 /** This flag can appear on TypeVarSymbols.
605 */
606 TYPE_VAR,
607 /** This flag can appear on MethodSymbols.
608 */
609 METHOD,
610 /** This flag can appear on VarSymbols, includes
611 * including ParamSymbol, and BindingSymbol.
612 */
613 VARIABLE;
614 }
615
616 @Retention(RetentionPolicy.RUNTIME)
617 public @interface Use {
618 public FlagTarget[] value();
619 }
620
621 @Retention(RetentionPolicy.RUNTIME)
622 public @interface NotFlag {}
623
624 @Retention(RetentionPolicy.RUNTIME)
625 public @interface CustomToStringValue {
626 public String value();
627 }
628
629 @Retention(RetentionPolicy.RUNTIME)
630 public @interface NoToStringValue {
631 }
632 }