1 /*
2 * Copyright (c) 1999, 2025, 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_IDENTITY = 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.VARIABLE})
136 @NoToStringValue
137 public static final int ACC_STRICT = 1<<11;
138 @Use({FlagTarget.CLASS})
139 @NoToStringValue
140 public static final int ACC_MODULE = 1<<15;
141
142 /* ***************************************
143 * Internal compiler flags (no bits in the lower 16).
144 *****************************************/
145
146 /** Flag is set if symbol is deprecated. See also DEPRECATED_REMOVAL.
147 */
148 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
149 public static final int DEPRECATED = 1<<17;
150
151 /** Flag is set for a variable symbol if the variable's definition
152 * has an initializer part.
153 */
154 @Use({FlagTarget.VARIABLE})
155 public static final int HASINIT = 1<<18;
156
157 /** Flag is set for a class or interface whose instances have identity
158 * i.e. any concrete class not declared with the modifier `value'
159 * (a) abstract class not declared `value'
160 * (b) older class files with ACC_SUPER bit set
161 */
162 @Use({FlagTarget.CLASS})
163 public static final int IDENTITY_TYPE = 1<<18;
164
165 /** Class is an implicitly declared top level class.
166 */
167 @Use({FlagTarget.CLASS})
168 public static final int IMPLICIT_CLASS = 1<<19;
169
170 /** Flag is set for compiler-generated anonymous method symbols
171 * that `own' an initializer block.
172 */
173 @Use({FlagTarget.METHOD})
174 public static final int BLOCK = 1<<21;
175
176 /** Marks a type as a value class */
177 @Use({FlagTarget.CLASS})
178 public static final int VALUE_CLASS = 1<<20;
179
180 /** Flag is set for ClassSymbols that are being compiled from source.
181 */
182 @Use({FlagTarget.CLASS})
183 public static final int FROM_SOURCE = 1<<21;
184
185 /** Flag is set for nested classes that do not access instance members
186 * or `this' of an outer class and therefore don't need to be passed
187 * a this$n reference. This value is currently set only for anonymous
188 * classes in superclass constructor calls.
189 * todo: use this value for optimizing away this$n parameters in
190 * other cases.
191 */
192 @Use({FlagTarget.CLASS, FlagTarget.VARIABLE})
193 public static final int NOOUTERTHIS = 1<<22;
194
195 /** Flag is set for package symbols if a package has a member or
196 * directory and therefore exists.
197 */
198 @Use({FlagTarget.CLASS, FlagTarget.PACKAGE})
199 public static final int EXISTS = 1<<23;
200
201 /** Flag is set for compiler-generated compound classes
202 * representing multiple variable bounds
203 */
204 @Use({FlagTarget.CLASS})
205 public static final int COMPOUND = 1<<24;
206
207 /** Flag is set for class symbols if a class file was found for this class.
208 */
209 @Use({FlagTarget.CLASS})
210 public static final int CLASS_SEEN = 1<<25;
211
212 /** Flag is set for class symbols if a source file was found for this
213 * class.
214 */
215 @Use({FlagTarget.CLASS})
216 public static final int SOURCE_SEEN = 1<<26;
217
218 /* State flags (are reset during compilation).
219 */
220
221 /** Flag for class symbols is set and later re-set as a lock in
222 * Enter to detect cycles in the superclass/superinterface
223 * relations. Similarly for constructor call cycle detection in
224 * Attr.
225 */
226 @Use({FlagTarget.CLASS, FlagTarget.METHOD})
227 public static final int LOCKED = 1<<27;
228
229 /** Flag for class symbols is set and later re-set to indicate that a class
230 * has been entered but has not yet been attributed.
231 */
232 @Use({FlagTarget.CLASS})
233 public static final int UNATTRIBUTED = 1<<28;
234
235 /** Flag for synthesized default constructors of anonymous classes.
236 */
237 @Use({FlagTarget.METHOD})
238 public static final int ANONCONSTR = 1<<29;
239
240 /**
241 * Flag to indicate the superclasses of this ClassSymbol has been attributed.
242 */
243 @Use({FlagTarget.CLASS})
244 public static final int SUPER_OWNER_ATTRIBUTED = 1<<29;
245
246 /** Flag for class symbols to indicate it has been checked and found
247 * acyclic.
248 */
249 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.TYPE_VAR})
250 public static final int ACYCLIC = 1<<30;
251
252 /** Flag that marks bridge methods.
253 */
254 @Use({FlagTarget.METHOD})
255 public static final long BRIDGE = 1L<<31;
256
257 /** Flag that marks formal parameters.
258 */
259 @Use({FlagTarget.VARIABLE})
260 public static final long PARAMETER = 1L<<33;
261
262 /** Flag that marks varargs methods.
263 */
264 @Use({FlagTarget.METHOD, FlagTarget.VARIABLE})
265 public static final long VARARGS = 1L<<34;
266
267 /** Flag for annotation type symbols to indicate it has been
268 * checked and found acyclic.
269 */
270 @Use({FlagTarget.CLASS})
271 public static final long ACYCLIC_ANN = 1L<<35;
272
273 /** Flag that marks a generated default constructor.
274 */
275 @Use({FlagTarget.METHOD})
276 public static final long GENERATEDCONSTR = 1L<<36;
277
278 /** Flag that marks a hypothetical method that need not really be
279 * generated in the binary, but is present in the symbol table to
280 * simplify checking for erasure clashes - also used for 292 poly sig methods.
281 */
282 @Use({FlagTarget.METHOD})
283 public static final long HYPOTHETICAL = 1L<<37;
284
285 /**
286 * Flag that marks an internal proprietary class.
287 */
288 @Use({FlagTarget.CLASS})
289 public static final long PROPRIETARY = 1L<<38;
290
291 /**
292 * Flag that marks a multi-catch parameter.
293 */
294 @Use({FlagTarget.VARIABLE})
295 public static final long UNION = 1L<<39;
296
297 /**
298 * Flags an erroneous TypeSymbol as viable for recovery.
299 * TypeSymbols only.
300 */
301 @Use({FlagTarget.CLASS, FlagTarget.TYPE_VAR})
302 public static final long RECOVERABLE = 1L<<40;
303
304 /**
305 * Flag that marks an 'effectively final' local variable.
306 */
307 @Use({FlagTarget.VARIABLE})
308 public static final long EFFECTIVELY_FINAL = 1L<<41;
309
310 /**
311 * Flag that marks non-override equivalent methods with the same signature,
312 * or a conflicting match binding (BindingSymbol).
313 */
314 @Use({FlagTarget.METHOD, FlagTarget.VARIABLE})
315 public static final long CLASH = 1L<<42;
316
317 /**
318 * Flag that marks either a default method or an interface containing default methods.
319 */
320 @Use({FlagTarget.CLASS, FlagTarget.METHOD})
321 public static final long DEFAULT = 1L<<43; // part of ExtendedStandardFlags, cannot be reused
322
323 /**
324 * Flag that marks class as auxiliary, ie a non-public class following
325 * the public class in a source file, that could block implicit compilation.
326 */
327 @Use({FlagTarget.CLASS})
328 public static final long AUXILIARY = 1L<<44;
329
330 /**
331 * Flag that marks that a symbol is not available in the current profile
332 */
333 @Use({FlagTarget.CLASS})
334 public static final long NOT_IN_PROFILE = 1L<<45;
335
336 /**
337 * Flag that indicates that an override error has been detected by Check.
338 */
339 @Use({FlagTarget.METHOD})
340 public static final long BAD_OVERRIDE = 1L<<45;
341
342 /**
343 * Flag that indicates a signature polymorphic method (292).
344 */
345 @Use({FlagTarget.METHOD})
346 public static final long SIGNATURE_POLYMORPHIC = 1L<<46;
347
348 /**
349 * Flag that indicates that an inference variable is used in a 'throws' clause.
350 */
351 @Use({FlagTarget.TYPE_VAR})
352 public static final long THROWS = 1L<<47;
353
354 /**
355 * Flag to indicate sealed class/interface declaration.
356 */
357 @Use({FlagTarget.CLASS})
358 public static final long SEALED = 1L<<48; // part of ExtendedStandardFlags, cannot be reused
359
360 /**
361 * Flag that marks a synthetic method body for a lambda expression
362 */
363 @Use({FlagTarget.METHOD})
364 public static final long LAMBDA_METHOD = 1L<<49;
365
366 /**
367 * Flag that marks a synthetic local capture field in a local/anon class
368 */
369 @Use({FlagTarget.VARIABLE})
370 public static final long LOCAL_CAPTURE_FIELD = 1L<<49;
371
372 /**
373 * Flag to control recursion in TransTypes
374 */
375 @Use({FlagTarget.CLASS})
376 public static final long TYPE_TRANSLATED = 1L<<50;
377
378 /**
379 * Flag to indicate class symbol is for module-info
380 */
381 @Use({FlagTarget.CLASS})
382 public static final long MODULE = 1L<<51;
383
384 /**
385 * Flag to indicate the given ModuleSymbol is an automatic module.
386 */
387 @Use({FlagTarget.MODULE})
388 public static final long AUTOMATIC_MODULE = 1L<<52;
389
390 /**
391 * Flag to indicate the given PackageSymbol contains any non-.java and non-.class resources.
392 */
393 @Use({FlagTarget.PACKAGE})
394 public static final long HAS_RESOURCE = 1L<<52;
395
396 /**
397 * Flag to indicate the given ParamSymbol has a user-friendly name filled.
398 */
399 @Use({FlagTarget.VARIABLE}) //ParamSymbols only
400 public static final long NAME_FILLED = 1L<<52;
401
402 /**
403 * Flag to indicate the given ModuleSymbol is a system module.
404 */
405 @Use({FlagTarget.MODULE})
406 public static final long SYSTEM_MODULE = 1L<<53;
407
408 /**
409 * Flag to indicate the given ClassSymbol is a value based.
410 */
411 @Use({FlagTarget.CLASS})
412 public static final long VALUE_BASED = 1L<<53;
413
414 /**
415 * Flag to indicate the given ClassSymbol is a value based.
416 */
417 @Use({FlagTarget.CLASS})
418 public static final long MIGRATED_VALUE_CLASS = 1L<<57; //ClassSymbols only
419
420 /**
421 * Flag to indicate the given symbol has a @Deprecated annotation.
422 */
423 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
424 public static final long DEPRECATED_ANNOTATION = 1L<<54;
425
426 /**
427 * Flag to indicate the given symbol has been deprecated and marked for removal.
428 */
429 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
430 public static final long DEPRECATED_REMOVAL = 1L<<55;
431
432 /**
433 * Flag to indicate the API element in question is for a preview API.
434 */
435 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
436 public static final long PREVIEW_API = 1L<<56; //any Symbol kind
437
438 /**
439 * Flag for synthesized default constructors of anonymous classes that have an enclosing expression.
440 */
441 @Use({FlagTarget.METHOD})
442 public static final long ANONCONSTR_BASED = 1L<<57;
443
444 /**
445 * Flag that marks finalize block as body-only, should not be copied into catch clauses.
446 * Used to implement try-with-resources.
447 */
448 @Use({FlagTarget.BLOCK})
449 public static final long BODY_ONLY_FINALIZE = 1L<<17;
450
451 /**
452 * Flag to indicate the API element in question is for a preview API.
453 */
454 @Use({FlagTarget.CLASS, FlagTarget.METHOD, FlagTarget.MODULE, FlagTarget.PACKAGE, FlagTarget.TYPE_VAR, FlagTarget.VARIABLE})
455 public static final long PREVIEW_REFLECTIVE = 1L<<58; //any Symbol kind
456
457 /**
458 * Flag to indicate the given variable is a match binding variable.
459 */
460 @Use({FlagTarget.VARIABLE})
461 public static final long MATCH_BINDING = 1L<<59;
462
463 /**
464 * A flag to indicate a match binding variable whose scope extends after the current statement.
465 */
466 @Use({FlagTarget.VARIABLE})
467 public static final long MATCH_BINDING_TO_OUTER = 1L<<60;
468
469 /**
470 * Flag to indicate that a class is a record. The flag is also used to mark fields that are
471 * part of the state vector of a record and to mark the canonical constructor
472 */
473 @Use({FlagTarget.CLASS, FlagTarget.VARIABLE, FlagTarget.METHOD})
474 public static final long RECORD = 1L<<61;
475
476 /**
477 * Flag to mark a record constructor as a compact one
478 */
479 @Use({FlagTarget.METHOD})
480 public static final long COMPACT_RECORD_CONSTRUCTOR = 1L<<51;
481
482 /**
483 * Flag to mark a record field that was not initialized in the compact constructor
484 */
485 @Use({FlagTarget.VARIABLE})
486 public static final long UNINITIALIZED_FIELD= 1L<<51;
487
488 /** Flag is set for compiler-generated record members, it could be applied to
489 * accessors and fields
490 */
491 @Use({FlagTarget.METHOD, FlagTarget.VARIABLE})
492 public static final int GENERATED_MEMBER = 1<<24;
493
494 /**
495 * Flag to indicate restricted method declaration.
496 */
497 @Use({FlagTarget.METHOD})
498 public static final long RESTRICTED = 1L<<62;
499
500 /**
501 * Flag to indicate parameters that require identity.
502 */
503 @Use({FlagTarget.VARIABLE}) //ParamSymbols only
504 public static final long REQUIRES_IDENTITY = 1L<<62;
505
506 /**
507 * Flag to indicate type annotations have been queued for field initializers.
508 */
509 @Use({FlagTarget.VARIABLE})
510 public static final long FIELD_INIT_TYPE_ANNOTATIONS_QUEUED = 1L<<53;
511
512 /**
513 * Flag to indicate that the class/interface was declared with the non-sealed modifier.
514 */
515 @Use({FlagTarget.CLASS})
516 @CustomToStringValue("non-sealed")
517 public static final long NON_SEALED = 1L<<63; // part of ExtendedStandardFlags, cannot be reused
518
519 /**
520 * Flag to indicate that a class has at least one strict field
521 */
522 @Use({FlagTarget.CLASS})
523 public static final long HAS_STRICT = 1L<<52; // ClassSymbols, temporary hack
524
525 /**
526 * Flag to indicate that a field is strict
527 */
528 @Use({FlagTarget.VARIABLE})
529 public static final long STRICT = 1L<<19; // VarSymbols
530
531 /**
532 * Describe modifier flags as they might appear in source code, i.e.,
533 * separated by spaces and in the order suggested by JLS 8.1.1.
534 */
535 public static String toSource(long flags) {
536 return asModifierSet(flags).stream()
537 .map(Modifier::toString)
538 .collect(Collectors.joining(" "));
539 }
540
541 /** Modifier masks.
542 */
543 @NotFlag
544 public static final int
545 AccessFlags = PUBLIC | PROTECTED | PRIVATE,
546 LocalClassFlags = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC | IDENTITY_TYPE,
547 StaticLocalClassFlags = LocalClassFlags | STATIC | INTERFACE,
548 MemberClassFlags = LocalClassFlags | INTERFACE | AccessFlags,
549 MemberStaticClassFlags = MemberClassFlags | STATIC,
550 ClassFlags = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,
551 InterfaceVarFlags = FINAL | STATIC | PUBLIC,
552 VarFlags = AccessFlags | FINAL | STATIC |
553 VOLATILE | TRANSIENT | ENUM,
554 ConstructorFlags = AccessFlags,
555 InterfaceMethodFlags = ABSTRACT | PUBLIC,
556 MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE |
557 SYNCHRONIZED | FINAL | STRICTFP,
558 RecordMethodFlags = AccessFlags | ABSTRACT | STATIC |
559 SYNCHRONIZED | FINAL | STRICTFP;
560 @NotFlag
561 public static final long
562 //NOTE: flags in ExtendedStandardFlags cannot be overlayed across Symbol kinds:
563 ExtendedStandardFlags = (long)StandardFlags | DEFAULT | SEALED | NON_SEALED | VALUE_CLASS,
564 ExtendedMemberClassFlags = (long)MemberClassFlags | SEALED | NON_SEALED | VALUE_CLASS,
565 ExtendedMemberStaticClassFlags = (long) MemberStaticClassFlags | SEALED | NON_SEALED | VALUE_CLASS,
566 ExtendedClassFlags = (long)ClassFlags | SEALED | NON_SEALED | VALUE_CLASS,
567 ExtendedLocalClassFlags = (long) LocalClassFlags | VALUE_CLASS,
568 ExtendedStaticLocalClassFlags = (long) StaticLocalClassFlags | VALUE_CLASS,
569 ValueFieldFlags = (long) VarFlags | STRICT | FINAL,
570 ModifierFlags = ((long)StandardFlags & ~INTERFACE) | DEFAULT | SEALED | NON_SEALED | VALUE_CLASS,
571 InterfaceMethodMask = ABSTRACT | PRIVATE | STATIC | PUBLIC | STRICTFP | DEFAULT,
572 AnnotationTypeElementMask = ABSTRACT | PUBLIC,
573 LocalVarFlags = FINAL | PARAMETER,
574 ReceiverParamFlags = PARAMETER;
575
576 public static Set<Modifier> asModifierSet(long flags) {
577 Set<Modifier> modifiers = modifierSets.get(flags);
578 if (modifiers == null) {
579 modifiers = java.util.EnumSet.noneOf(Modifier.class);
580 if (0 != (flags & PUBLIC)) modifiers.add(Modifier.PUBLIC);
581 if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED);
582 if (0 != (flags & PRIVATE)) modifiers.add(Modifier.PRIVATE);
583 if (0 != (flags & ABSTRACT)) modifiers.add(Modifier.ABSTRACT);
584 if (0 != (flags & STATIC)) modifiers.add(Modifier.STATIC);
585 if (0 != (flags & SEALED)) modifiers.add(Modifier.SEALED);
586 if (0 != (flags & NON_SEALED))
587 modifiers.add(Modifier.NON_SEALED);
588 if (0 != (flags & FINAL)) modifiers.add(Modifier.FINAL);
589 if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT);
590 if (0 != (flags & VOLATILE)) modifiers.add(Modifier.VOLATILE);
591 if (0 != (flags & SYNCHRONIZED))
592 modifiers.add(Modifier.SYNCHRONIZED);
593 if (0 != (flags & NATIVE)) modifiers.add(Modifier.NATIVE);
594 if (0 != (flags & STRICTFP)) modifiers.add(Modifier.STRICTFP);
595 if (0 != (flags & DEFAULT)) modifiers.add(Modifier.DEFAULT);
596 if (0 != (flags & VALUE_CLASS)) modifiers.add(Modifier.VALUE);
597 modifiers = Collections.unmodifiableSet(modifiers);
598 modifierSets.put(flags, modifiers);
599 }
600 return modifiers;
601 }
602
603 // Cache of modifier sets.
604 private static final Map<Long, Set<Modifier>> modifierSets = new ConcurrentHashMap<>(64);
605
606 public static boolean isStatic(Symbol symbol) {
607 return (symbol.flags() & STATIC) != 0;
608 }
609
610 public static boolean isEnum(Symbol symbol) {
611 return (symbol.flags() & ENUM) != 0;
612 }
613
614 public static boolean isConstant(Symbol.VarSymbol symbol) {
615 return symbol.getConstValue() != null;
616 }
617
618 public enum FlagTarget {
619 /** This flag can appear the JCBlock.
620 */
621 BLOCK,
622 /** This flag can appear on ClassSymbols.
623 */
624 CLASS,
625 /** This flag can appear on ModuleSymbols.
626 */
627 MODULE,
628 /** This flag can appear on PackageSymbols.
629 */
630 PACKAGE,
631 /** This flag can appear on TypeVarSymbols.
632 */
633 TYPE_VAR,
634 /** This flag can appear on MethodSymbols.
635 */
636 METHOD,
637 /** This flag can appear on VarSymbols, includes
638 * including ParamSymbol, and BindingSymbol.
639 */
640 VARIABLE;
641 }
642
643 @Retention(RetentionPolicy.RUNTIME)
644 public @interface Use {
645 public FlagTarget[] value();
646 }
647
648 @Retention(RetentionPolicy.RUNTIME)
649 public @interface NotFlag {}
650
651 @Retention(RetentionPolicy.RUNTIME)
652 public @interface CustomToStringValue {
653 public String value();
654 }
655
656 @Retention(RetentionPolicy.RUNTIME)
657 public @interface NoToStringValue {
658 }
659 }