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 java.lang.reflect;
27
28 import java.util.Collections;
29 import java.util.Objects;
30 import java.util.Map;
31 import java.util.Set;
32 import java.util.function.Function;
33 import static java.util.Map.entry;
34
35 /**
36 * Represents a JVM access or module-related flag on a runtime member,
37 * such as a {@linkplain Class class}, {@linkplain Field field}, or
38 * {@linkplain Executable method}.
39 *
40 * <P>JVM access and module-related flags are related to, but distinct
41 * from Java language {@linkplain Modifier modifiers}. Some modifiers
42 * and access flags have a one-to-one correspondence, such as {@code
43 * public}. In other cases, some language-level modifiers do
44 * <em>not</em> have an access flag, such as {@code sealed} (JVMS
45 * {@jvms 4.7.31}) and some access flags have no corresponding
46 * modifier, such as {@linkplain #SYNTHETIC synthetic}.
47 *
168 new Function<ClassFileFormatVersion, Set<Location>>() {
169 @Override
170 public Set<Location> apply(ClassFileFormatVersion cffv) {
171 if (cffv.compareTo(ClassFileFormatVersion.RELEASE_8) >= 0) {
172 return Location.SET_FINAL_8;
173 } else {
174 return (cffv == ClassFileFormatVersion.RELEASE_0) ?
175 Location.SET_CLASS_FIELD_METHOD :
176 Location.SET_CLASS_FIELD_METHOD_INNER_CLASS;
177 }
178 }
179 }),
180
181 /**
182 * The access flag {@code ACC_SUPER} with a mask value of {@code
183 * 0x0020}.
184 *
185 * @apiNote
186 * In Java SE 8 and above, the JVM treats the {@code ACC_SUPER}
187 * flag as set in every class file (JVMS {@jvms 4.1}).
188 */
189 SUPER(0x0000_0020, false, Location.SET_CLASS, null),
190
191 /**
192 * The module flag {@code ACC_OPEN} with a mask value of {@code
193 * 0x0020}.
194 * @see java.lang.module.ModuleDescriptor#isOpen
195 */
196 OPEN(0x0000_0020, false, Location.SET_MODULE,
197 new Function<ClassFileFormatVersion, Set<Location>>() {
198 @Override
199 public Set<Location> apply(ClassFileFormatVersion cffv) {
200 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_9) >= 0 ) ?
201 Location.SET_MODULE:
202 Location.EMPTY_SET;}
203 }),
204
205 /**
206 * The module requires flag {@code ACC_TRANSITIVE} with a mask
207 * value of {@code 0x0020}.
208 * @see java.lang.module.ModuleDescriptor.Requires.Modifier#TRANSITIVE
209 */
210 TRANSITIVE(0x0000_0020, false, Location.SET_MODULE_REQUIRES,
211 new Function<ClassFileFormatVersion, Set<Location>>() {
212 @Override
213 public Set<Location> apply(ClassFileFormatVersion cffv) {
214 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_9) >= 0 ) ?
215 Location.SET_MODULE_REQUIRES:
216 Location.EMPTY_SET;}
217 }),
218
219 /**
220 * The access flag {@code ACC_SYNCHRONIZED}, corresponding to the
221 * source modifier {@link Modifier#SYNCHRONIZED synchronized}, with
222 * a mask value of <code>{@value "0x%04x" Modifier#SYNCHRONIZED}</code>.
223 */
224 SYNCHRONIZED(Modifier.SYNCHRONIZED, true, Location.SET_METHOD, null),
225
226 /**
227 * The module requires flag {@code ACC_STATIC_PHASE} with a mask
228 * value of {@code 0x0040}.
229 * @see java.lang.module.ModuleDescriptor.Requires.Modifier#STATIC
230 */
231 STATIC_PHASE(0x0000_0040, false, Location.SET_MODULE_REQUIRES,
232 new Function<ClassFileFormatVersion, Set<Location>>() {
233 @Override
234 public Set<Location> apply(ClassFileFormatVersion cffv) {
235 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_9) >= 0 ) ?
236 Location.SET_MODULE_REQUIRES:
237 Location.EMPTY_SET;}
238 }),
239
240 /**
241 * The access flag {@code ACC_VOLATILE}, corresponding to the
242 * source modifier {@link Modifier#VOLATILE volatile}, with a mask
243 * value of <code>{@value "0x%04x" Modifier#VOLATILE}</code>.
244 */
245 VOLATILE(Modifier.VOLATILE, true, Location.SET_FIELD, null),
246
247 /**
248 * The access flag {@code ACC_BRIDGE} with a mask value of
249 * <code>{@value "0x%04x" Modifier#BRIDGE}</code>
250 * @see Method#isBridge()
251 */
252 BRIDGE(Modifier.BRIDGE, false, Location.SET_METHOD,
253 new Function<ClassFileFormatVersion, Set<Location>>() {
254 @Override
255 public Set<Location> apply(ClassFileFormatVersion cffv) {
256 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_5) >= 0 ) ?
257 Location.SET_METHOD:
258 Location.EMPTY_SET;}
259 }),
260
318 /**
319 * The access flag {@code ACC_STRICT}, corresponding to the source
320 * modifier {@link Modifier#STRICT strictfp}, with a mask value of
321 * <code>{@value "0x%04x" Modifier#STRICT}</code>.
322 *
323 * @apiNote
324 * The {@code ACC_STRICT} access flag is defined for class file
325 * major versions 46 through 60, inclusive (JVMS {@jvms 4.6}),
326 * corresponding to Java SE 1.2 through 16.
327 */
328 STRICT(Modifier.STRICT, true, Location.EMPTY_SET,
329 new Function<ClassFileFormatVersion, Set<Location>>() {
330 @Override
331 public Set<Location> apply(ClassFileFormatVersion cffv) {
332 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_2) >= 0 &&
333 cffv.compareTo(ClassFileFormatVersion.RELEASE_16) <= 0) ?
334 Location.SET_METHOD:
335 Location.EMPTY_SET;}
336 }),
337
338 /**
339 * The access flag {@code ACC_SYNTHETIC} with a mask value of
340 * <code>{@value "0x%04x" Modifier#SYNTHETIC}</code>.
341 * @see Class#isSynthetic()
342 * @see Executable#isSynthetic()
343 * @see java.lang.module.ModuleDescriptor.Modifier#SYNTHETIC
344 */
345 SYNTHETIC(Modifier.SYNTHETIC, false, Location.SET_SYNTHETIC_9,
346 new Function<ClassFileFormatVersion, Set<Location>>() {
347 @Override
348 public Set<Location> apply(ClassFileFormatVersion cffv) {
349 if (cffv.compareTo(ClassFileFormatVersion.RELEASE_9) >= 0 )
350 return Location.SET_SYNTHETIC_9;
351 else {
352 return
353 switch(cffv) {
354 case RELEASE_7 -> Location.SET_SYNTHETIC_7;
355 case RELEASE_8 -> Location.SET_SYNTHETIC_8;
356 default -> Location.EMPTY_SET;
357 };
469 * given class file format version}
470 * @param cffv the class file format version to use
471 * @throws NullPointerException if the parameter is {@code null}
472 */
473 public Set<Location> locations(ClassFileFormatVersion cffv) {
474 Objects.requireNonNull(cffv);
475 if (cffvToLocations == null) {
476 return locations;
477 } else {
478 return cffvToLocations.apply(cffv);
479 }
480 }
481
482 /**
483 * {@return an unmodifiable set of access flags for the given mask value
484 * appropriate for the location in question}
485 *
486 * @param mask bit mask of access flags
487 * @param location context to interpret mask value
488 * @throws IllegalArgumentException if the mask contains bit
489 * positions not support for the location in question
490 */
491 public static Set<AccessFlag> maskToAccessFlags(int mask, Location location) {
492 Set<AccessFlag> result = java.util.EnumSet.noneOf(AccessFlag.class);
493 for (var accessFlag : LocationToFlags.locationToFlags.get(location)) {
494 int accessMask = accessFlag.mask();
495 if ((mask & accessMask) != 0) {
496 result.add(accessFlag);
497 mask = mask & ~accessMask;
498 }
499 }
500 if (mask != 0) {
501 throw new IllegalArgumentException("Unmatched bit position 0x" +
502 Integer.toHexString(mask) +
503 " for location " + location);
504 }
505 return Collections.unmodifiableSet(result);
506 }
507
508 /**
509 * A location within a class file where flags can be applied.
510 *
511 * Note that since these locations represent class file structures
512 * rather than language structures many language structures, such
513 * as constructors and interfaces, are <em>not</em> present.
514 * @since 20
515 */
516 public enum Location {
517 /**
518 * Class location.
519 * @jvms 4.1 The ClassFile Structure
520 */
521 CLASS,
522
523 /**
524 * Field location.
525 * @jvms 4.5 Fields
526 */
527 FIELD,
606 Set.of(CLASS, FIELD, METHOD,
607 INNER_CLASS, METHOD_PARAMETER);
608 private static final Set<Location> SET_SYNTHETIC_9 =
609 // Added as an access flag in 7
610 Set.of(CLASS, FIELD, METHOD,
611 INNER_CLASS,
612 METHOD_PARAMETER, // Added in 8
613 // Module-related items added in 9
614 MODULE, MODULE_REQUIRES,
615 MODULE_EXPORTS, MODULE_OPENS);
616 private static final Set<Location> SET_MANDATED_9 =
617 Set.of(METHOD_PARAMETER, // From 8
618 // Starting in 9
619 MODULE, MODULE_REQUIRES,
620 MODULE_EXPORTS, MODULE_OPENS);
621 }
622
623 private static class LocationToFlags {
624 private static Map<Location, Set<AccessFlag>> locationToFlags =
625 Map.ofEntries(entry(Location.CLASS,
626 Set.of(PUBLIC, FINAL, SUPER,
627 INTERFACE, ABSTRACT,
628 SYNTHETIC, ANNOTATION,
629 ENUM, AccessFlag.MODULE)),
630 entry(Location.FIELD,
631 Set.of(PUBLIC, PRIVATE, PROTECTED,
632 STATIC, FINAL, VOLATILE,
633 TRANSIENT, SYNTHETIC, ENUM)),
634 entry(Location.METHOD,
635 Set.of(PUBLIC, PRIVATE, PROTECTED,
636 STATIC, FINAL, SYNCHRONIZED,
637 BRIDGE, VARARGS, NATIVE,
638 ABSTRACT, STRICT, SYNTHETIC)),
639 entry(Location.INNER_CLASS,
640 Set.of(PUBLIC, PRIVATE, PROTECTED,
641 STATIC, FINAL, INTERFACE, ABSTRACT,
642 SYNTHETIC, ANNOTATION, ENUM)),
643 entry(Location.METHOD_PARAMETER,
644 Set.of(FINAL, SYNTHETIC, MANDATED)),
645 entry(Location.MODULE,
646 Set.of(OPEN, SYNTHETIC, MANDATED)),
647 entry(Location.MODULE_REQUIRES,
648 Set.of(TRANSITIVE, STATIC_PHASE, SYNTHETIC, MANDATED)),
649 entry(Location.MODULE_EXPORTS,
650 Set.of(SYNTHETIC, MANDATED)),
651 entry(Location.MODULE_OPENS,
652 Set.of(SYNTHETIC, MANDATED)));
653 }
654 }
|
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 java.lang.reflect;
27
28 import jdk.internal.javac.PreviewFeature;
29 import jdk.internal.misc.PreviewFeatures;
30
31 import java.util.Collections;
32 import java.util.Objects;
33 import java.util.Map;
34 import java.util.Set;
35 import java.util.function.Function;
36 import static java.util.Map.entry;
37
38 /**
39 * Represents a JVM access or module-related flag on a runtime member,
40 * such as a {@linkplain Class class}, {@linkplain Field field}, or
41 * {@linkplain Executable method}.
42 *
43 * <P>JVM access and module-related flags are related to, but distinct
44 * from Java language {@linkplain Modifier modifiers}. Some modifiers
45 * and access flags have a one-to-one correspondence, such as {@code
46 * public}. In other cases, some language-level modifiers do
47 * <em>not</em> have an access flag, such as {@code sealed} (JVMS
48 * {@jvms 4.7.31}) and some access flags have no corresponding
49 * modifier, such as {@linkplain #SYNTHETIC synthetic}.
50 *
171 new Function<ClassFileFormatVersion, Set<Location>>() {
172 @Override
173 public Set<Location> apply(ClassFileFormatVersion cffv) {
174 if (cffv.compareTo(ClassFileFormatVersion.RELEASE_8) >= 0) {
175 return Location.SET_FINAL_8;
176 } else {
177 return (cffv == ClassFileFormatVersion.RELEASE_0) ?
178 Location.SET_CLASS_FIELD_METHOD :
179 Location.SET_CLASS_FIELD_METHOD_INNER_CLASS;
180 }
181 }
182 }),
183
184 /**
185 * The access flag {@code ACC_SUPER} with a mask value of {@code
186 * 0x0020}.
187 *
188 * @apiNote
189 * In Java SE 8 and above, the JVM treats the {@code ACC_SUPER}
190 * flag as set in every class file (JVMS {@jvms 4.1}).
191 * If preview feature is enabled,
192 * the {@code 0x0020} access flag bit is {@linkplain #IDENTITY IDENTITY access flag}.
193 */
194 SUPER(0x0000_0020, false,
195 PreviewFeatures.isEnabled() ? Location.EMPTY_SET : Location.SET_CLASS,
196 new Function<ClassFileFormatVersion, Set<Location>>() {
197 @Override
198 public Set<Location> apply(ClassFileFormatVersion cffv) {
199 return (cffv.compareTo(ClassFileFormatVersion.latest()) >= 0) &&
200 PreviewFeatures.isEnabled() ? Location.EMPTY_SET : Location.SET_CLASS;
201 }
202 }),
203
204 /**
205 * The access flag {@code ACC_IDENTITY}, corresponding to the
206 * modifier {@link Modifier#IDENTITY identity}, with a mask
207 * value of <code>{@value "0x%04x" Modifier#IDENTITY}</code>.
208 * @jvms 4.1 -B. Class access and property modifiers
209 *
210 * @since Valhalla
211 */
212 @PreviewFeature(feature = PreviewFeature.Feature.VALUE_OBJECTS, reflective=true)
213 IDENTITY(Modifier.IDENTITY, false,
214 PreviewFeatures.isEnabled() ? Location.SET_CLASS_INNER_CLASS : Location.EMPTY_SET,
215 new Function<ClassFileFormatVersion, Set<Location>>() {
216 @Override
217 public Set<Location> apply(ClassFileFormatVersion cffv) {
218 return (cffv.compareTo(ClassFileFormatVersion.latest()) >= 0
219 && PreviewFeatures.isEnabled())
220 ? Location.SET_CLASS_INNER_CLASS : Location.EMPTY_SET;
221 }
222 }),
223
224 /**
225 * The module flag {@code ACC_OPEN} with a mask value of {@code
226 * 0x0020}.
227 * @see java.lang.module.ModuleDescriptor#isOpen
228 */
229 OPEN(0x0000_0020, false, Location.SET_MODULE,
230 new Function<ClassFileFormatVersion, Set<Location>>() {
231 @Override
232 public Set<Location> apply(ClassFileFormatVersion cffv) {
233 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_9) >= 0 ) ?
234 Location.SET_MODULE:
235 Location.EMPTY_SET;}
236 }),
237
238 /**
239 * The module requires flag {@code ACC_TRANSITIVE} with a mask
240 * value of {@code 0x0020}.
241 * @see java.lang.module.ModuleDescriptor.Requires.Modifier#TRANSITIVE
242 */
243 TRANSITIVE(0x0000_0020, false, Location.SET_MODULE_REQUIRES,
244 new Function<ClassFileFormatVersion, Set<Location>>() {
245 @Override
246 public Set<Location> apply(ClassFileFormatVersion cffv) {
247 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_9) >= 0 ) ?
248 Location.SET_MODULE_REQUIRES:
249 Location.EMPTY_SET;}
250 }),
251
252 /**
253 * The access flag {@code ACC_SYNCHRONIZED}, corresponding to the
254 * source modifier {@link Modifier#SYNCHRONIZED synchronized}, with
255 * a mask value of <code>{@value "0x%04x" Modifier#SYNCHRONIZED}</code>.
256 */
257 SYNCHRONIZED(Modifier.SYNCHRONIZED, true, Location.SET_METHOD, null),
258
259 /**
260 * The module requires flag {@code ACC_STATIC_PHASE} with a mask
261 * value of {@code 0x0040}.
262 * @see java.lang.module.ModuleDescriptor.Requires.Modifier#STATIC
263 */
264 STATIC_PHASE(0x0000_0040, false, Location.SET_MODULE_REQUIRES,
265 new Function<ClassFileFormatVersion, Set<Location>>() {
266 @Override
267 public Set<Location> apply(ClassFileFormatVersion cffv) {
268 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_9) >= 0 ) ?
269 Location.SET_MODULE_REQUIRES:
270 Location.EMPTY_SET;}
271 }),
272
273 /**
274 * The access flag {@code ACC_VOLATILE}, corresponding to the
275 * source modifier {@link Modifier#VOLATILE volatile}, with a mask
276 * value of <code>{@value "0x%04x" Modifier#VOLATILE}</code>.
277 */
278 VOLATILE(Modifier.VOLATILE, true, Location.SET_FIELD, null),
279
280 /**
281 * The access flag {@code ACC_BRIDGE} with a mask value of
282 * <code>{@value "0x%04x" Modifier#BRIDGE}</code>
283 * @see Method#isBridge()
284 */
285 BRIDGE(Modifier.BRIDGE, false, Location.SET_METHOD,
286 new Function<ClassFileFormatVersion, Set<Location>>() {
287 @Override
288 public Set<Location> apply(ClassFileFormatVersion cffv) {
289 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_5) >= 0 ) ?
290 Location.SET_METHOD:
291 Location.EMPTY_SET;}
292 }),
293
351 /**
352 * The access flag {@code ACC_STRICT}, corresponding to the source
353 * modifier {@link Modifier#STRICT strictfp}, with a mask value of
354 * <code>{@value "0x%04x" Modifier#STRICT}</code>.
355 *
356 * @apiNote
357 * The {@code ACC_STRICT} access flag is defined for class file
358 * major versions 46 through 60, inclusive (JVMS {@jvms 4.6}),
359 * corresponding to Java SE 1.2 through 16.
360 */
361 STRICT(Modifier.STRICT, true, Location.EMPTY_SET,
362 new Function<ClassFileFormatVersion, Set<Location>>() {
363 @Override
364 public Set<Location> apply(ClassFileFormatVersion cffv) {
365 return (cffv.compareTo(ClassFileFormatVersion.RELEASE_2) >= 0 &&
366 cffv.compareTo(ClassFileFormatVersion.RELEASE_16) <= 0) ?
367 Location.SET_METHOD:
368 Location.EMPTY_SET;}
369 }),
370
371 /**
372 * The access flag {@code ACC_STRICT_INIT}, with a mask
373 * value of {@code 0x0800}.
374 *
375 * @jvms 4.5 Fields
376 * @since Valhalla
377 */
378 @PreviewFeature(feature = PreviewFeature.Feature.VALUE_OBJECTS, reflective=true)
379 STRICT_INIT(Modifier.STRICT, false,
380 PreviewFeatures.isEnabled() ? Location.SET_FIELD : Location.EMPTY_SET,
381 new Function<ClassFileFormatVersion, Set<Location>>() {
382 @Override
383 public Set<Location> apply(ClassFileFormatVersion cffv) {
384 return (cffv.compareTo(ClassFileFormatVersion.latest()) >= 0
385 && PreviewFeatures.isEnabled())
386 ? Location.SET_FIELD : Location.EMPTY_SET;
387 }
388 }),
389
390 /**
391 * The access flag {@code ACC_SYNTHETIC} with a mask value of
392 * <code>{@value "0x%04x" Modifier#SYNTHETIC}</code>.
393 * @see Class#isSynthetic()
394 * @see Executable#isSynthetic()
395 * @see java.lang.module.ModuleDescriptor.Modifier#SYNTHETIC
396 */
397 SYNTHETIC(Modifier.SYNTHETIC, false, Location.SET_SYNTHETIC_9,
398 new Function<ClassFileFormatVersion, Set<Location>>() {
399 @Override
400 public Set<Location> apply(ClassFileFormatVersion cffv) {
401 if (cffv.compareTo(ClassFileFormatVersion.RELEASE_9) >= 0 )
402 return Location.SET_SYNTHETIC_9;
403 else {
404 return
405 switch(cffv) {
406 case RELEASE_7 -> Location.SET_SYNTHETIC_7;
407 case RELEASE_8 -> Location.SET_SYNTHETIC_8;
408 default -> Location.EMPTY_SET;
409 };
521 * given class file format version}
522 * @param cffv the class file format version to use
523 * @throws NullPointerException if the parameter is {@code null}
524 */
525 public Set<Location> locations(ClassFileFormatVersion cffv) {
526 Objects.requireNonNull(cffv);
527 if (cffvToLocations == null) {
528 return locations;
529 } else {
530 return cffvToLocations.apply(cffv);
531 }
532 }
533
534 /**
535 * {@return an unmodifiable set of access flags for the given mask value
536 * appropriate for the location in question}
537 *
538 * @param mask bit mask of access flags
539 * @param location context to interpret mask value
540 * @throws IllegalArgumentException if the mask contains bit
541 * positions not supported for the location in question
542 */
543 public static Set<AccessFlag> maskToAccessFlags(int mask, Location location) {
544 Set<AccessFlag> result = java.util.EnumSet.noneOf(AccessFlag.class);
545 for (var accessFlag : LocationToFlags.locationToFlags.get(location)) {
546 int accessMask = accessFlag.mask();
547 if ((mask & accessMask) != 0) {
548 result.add(accessFlag);
549 mask = mask & ~accessMask;
550 if (mask == 0) {
551 break; // no more mask bits
552 }
553 }
554 }
555 if (mask != 0) {
556 throw new IllegalArgumentException("Unmatched bit position 0x" +
557 Integer.toHexString(mask) +
558 " for location " + location);
559 }
560 return Collections.unmodifiableSet(result);
561 }
562
563 /**
564 * {@return an unmodifiable set of access flags for the given mask value
565 * appropriate for the location in question}
566 *
567 * @param mask bit mask of access flags
568 * @param location context to interpret mask value
569 * @param cffv the class file format version
570 * @throws IllegalArgumentException if the mask contains bit
571 * positions not supported for the location in question
572 *
573 * @since Valhalla
574 */
575 public static Set<AccessFlag> maskToAccessFlags(int mask, Location location,
576 ClassFileFormatVersion cffv) {
577 Set<AccessFlag> result = java.util.EnumSet.noneOf(AccessFlag.class);
578 for (var accessFlag : AccessFlag.values()) {
579 int accessMask = accessFlag.mask();
580 if ((mask & accessMask) != 0) {
581 var locations = accessFlag.locations(cffv);
582 if (locations.contains(location)) {
583 result.add(accessFlag);
584 mask = mask & ~accessMask;
585 if (mask == 0) {
586 break; // no more mask bits
587 }
588 }
589 }
590 }
591 if (mask != 0) {
592 throw new IllegalArgumentException("Unmatched bit position 0x" +
593 Integer.toHexString(mask) +
594 " for location " + location +
595 " for class file format version " + cffv);
596 }
597 return Collections.unmodifiableSet(result);
598 }
599
600
601 /**
602 * A location within a class file where flags can be applied.
603 *
604 * Note that since these locations represent class file structures
605 * rather than language structures many language structures, such
606 * as constructors and interfaces, are <em>not</em> present.
607 * @since 20
608 */
609 public enum Location {
610 /**
611 * Class location.
612 * @jvms 4.1 The ClassFile Structure
613 */
614 CLASS,
615
616 /**
617 * Field location.
618 * @jvms 4.5 Fields
619 */
620 FIELD,
699 Set.of(CLASS, FIELD, METHOD,
700 INNER_CLASS, METHOD_PARAMETER);
701 private static final Set<Location> SET_SYNTHETIC_9 =
702 // Added as an access flag in 7
703 Set.of(CLASS, FIELD, METHOD,
704 INNER_CLASS,
705 METHOD_PARAMETER, // Added in 8
706 // Module-related items added in 9
707 MODULE, MODULE_REQUIRES,
708 MODULE_EXPORTS, MODULE_OPENS);
709 private static final Set<Location> SET_MANDATED_9 =
710 Set.of(METHOD_PARAMETER, // From 8
711 // Starting in 9
712 MODULE, MODULE_REQUIRES,
713 MODULE_EXPORTS, MODULE_OPENS);
714 }
715
716 private static class LocationToFlags {
717 private static Map<Location, Set<AccessFlag>> locationToFlags =
718 Map.ofEntries(entry(Location.CLASS,
719 Set.of(PUBLIC, FINAL, (PreviewFeatures.isEnabled() ? IDENTITY : SUPER),
720 INTERFACE, ABSTRACT,
721 SYNTHETIC, ANNOTATION,
722 ENUM, AccessFlag.MODULE)),
723 entry(Location.FIELD,
724 PreviewFeatures.isEnabled() ?
725 // STRICT_INIT should be included only if preview is enabled
726 Set.of(PUBLIC, PRIVATE, PROTECTED,
727 STATIC, FINAL, VOLATILE,
728 TRANSIENT, SYNTHETIC, ENUM, STRICT_INIT) :
729 Set.of(PUBLIC, PRIVATE, PROTECTED,
730 STATIC, FINAL, VOLATILE,
731 TRANSIENT, SYNTHETIC, ENUM)),
732 entry(Location.METHOD,
733 Set.of(PUBLIC, PRIVATE, PROTECTED,
734 STATIC, FINAL, SYNCHRONIZED,
735 BRIDGE, VARARGS, NATIVE,
736 ABSTRACT, STRICT, SYNTHETIC)),
737 entry(Location.INNER_CLASS,
738 Set.of(PUBLIC, PRIVATE, PROTECTED, (PreviewFeatures.isEnabled() ? IDENTITY : SUPER),
739 STATIC, FINAL, INTERFACE, ABSTRACT,
740 SYNTHETIC, ANNOTATION, ENUM)),
741 entry(Location.METHOD_PARAMETER,
742 Set.of(FINAL, SYNTHETIC, MANDATED)),
743 entry(Location.MODULE,
744 Set.of(OPEN, SYNTHETIC, MANDATED)),
745 entry(Location.MODULE_REQUIRES,
746 Set.of(TRANSITIVE, STATIC_PHASE, SYNTHETIC, MANDATED)),
747 entry(Location.MODULE_EXPORTS,
748 Set.of(SYNTHETIC, MANDATED)),
749 entry(Location.MODULE_OPENS,
750 Set.of(SYNTHETIC, MANDATED)));
751 }
752 }
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