1 /*
2 * Copyright (c) 2003, 2023, 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 jdk.internal.access;
27
28 import java.io.InputStream;
29 import java.lang.annotation.Annotation;
30 import java.lang.foreign.MemorySegment;
31 import java.lang.invoke.MethodHandle;
32 import java.lang.invoke.MethodType;
33 import java.lang.module.ModuleDescriptor;
34 import java.lang.reflect.Executable;
35 import java.lang.reflect.Method;
36 import java.net.URI;
37 import java.nio.charset.CharacterCodingException;
38 import java.nio.charset.Charset;
39 import java.security.AccessControlContext;
40 import java.security.ProtectionDomain;
41 import java.util.List;
42 import java.util.Map;
43 import java.util.Set;
44 import java.util.concurrent.Callable;
45 import java.util.concurrent.ConcurrentHashMap;
46 import java.util.concurrent.RejectedExecutionException;
47 import java.util.stream.Stream;
48
49 import jdk.internal.javac.PreviewFeature;
50 import jdk.internal.misc.CarrierThreadLocal;
51 import jdk.internal.module.ServicesCatalog;
52 import jdk.internal.reflect.ConstantPool;
53 import jdk.internal.vm.Continuation;
54 import jdk.internal.vm.ContinuationScope;
55 import jdk.internal.vm.StackableScope;
56 import jdk.internal.vm.ThreadContainer;
57 import sun.reflect.annotation.AnnotationType;
58 import sun.nio.ch.Interruptible;
59
60 public interface JavaLangAccess {
61
62 /**
63 * Returns the list of {@code Method} objects for the declared public
64 * methods of this class or interface that have the specified method name
65 * and parameter types.
66 */
67 List<Method> getDeclaredPublicMethods(Class<?> klass, String name, Class<?>... parameterTypes);
68
69 /**
70 * Return the constant pool for a class.
71 */
72 ConstantPool getConstantPool(Class<?> klass);
73
74 /**
75 * Compare-And-Set the AnnotationType instance corresponding to this class.
76 * (This method only applies to annotation types.)
77 */
78 boolean casAnnotationType(Class<?> klass, AnnotationType oldType, AnnotationType newType);
79
80 /**
81 * Get the AnnotationType instance corresponding to this class.
82 * (This method only applies to annotation types.)
83 */
84 AnnotationType getAnnotationType(Class<?> klass);
85
86 /**
87 * Get the declared annotations for a given class, indexed by their types.
88 */
89 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap(Class<?> klass);
90
91 /**
92 * Get the array of bytes that is the class-file representation
93 * of this Class' annotations.
94 */
95 byte[] getRawClassAnnotations(Class<?> klass);
96
97 /**
98 * Get the array of bytes that is the class-file representation
99 * of this Class' type annotations.
100 */
101 byte[] getRawClassTypeAnnotations(Class<?> klass);
102
103 /**
104 * Get the array of bytes that is the class-file representation
105 * of this Executable's type annotations.
106 */
107 byte[] getRawExecutableTypeAnnotations(Executable executable);
108
109 /**
110 * Returns the elements of an enum class or null if the
111 * Class object does not represent an enum type;
112 * the result is uncloned, cached, and shared by all callers.
113 */
114 <E extends Enum<E>> E[] getEnumConstantsShared(Class<E> klass);
115
116 /**
117 * Set current thread's blocker field.
118 */
119 void blockedOn(Interruptible b);
120
121 /**
122 * Registers a shutdown hook.
123 *
124 * It is expected that this method with registerShutdownInProgress=true
125 * is only used to register DeleteOnExitHook since the first file
126 * may be added to the delete on exit list by the application shutdown
127 * hooks.
128 *
129 * @param slot the slot in the shutdown hook array, whose element
130 * will be invoked in order during shutdown
131 * @param registerShutdownInProgress true to allow the hook
132 * to be registered even if the shutdown is in progress.
133 * @param hook the hook to be registered
134 *
135 * @throws IllegalStateException if shutdown is in progress and
136 * the slot is not valid to register.
137 */
138 void registerShutdownHook(int slot, boolean registerShutdownInProgress, Runnable hook);
139
140 /**
141 * Returns a new Thread with the given Runnable and an
142 * inherited AccessControlContext.
143 */
144 Thread newThreadWithAcc(Runnable target, @SuppressWarnings("removal") AccessControlContext acc);
145
146 /**
147 * Invokes the finalize method of the given object.
148 */
149 void invokeFinalize(Object o) throws Throwable;
150
151 /**
152 * Returns the ConcurrentHashMap used as a storage for ClassLoaderValue(s)
153 * associated with the given class loader, creating it if it doesn't already exist.
154 */
155 ConcurrentHashMap<?, ?> createOrGetClassLoaderValueMap(ClassLoader cl);
156
157 /**
158 * Defines a class with the given name to a class loader.
159 */
160 Class<?> defineClass(ClassLoader cl, String name, byte[] b, ProtectionDomain pd, String source);
161
162 /**
163 * Defines a class with the given name to a class loader with
164 * the given flags and class data.
165 *
166 * @see java.lang.invoke.MethodHandles.Lookup#defineClass
167 */
168 Class<?> defineClass(ClassLoader cl, Class<?> lookup, String name, byte[] b, ProtectionDomain pd, boolean initialize, int flags, Object classData);
169
170 /**
171 * Returns a class loaded by the bootstrap class loader.
172 */
173 Class<?> findBootstrapClassOrNull(String name);
174
175 /**
176 * Define a Package of the given name and module by the given class loader.
177 */
178 Package definePackage(ClassLoader cl, String name, Module module);
179
180 /**
181 * Record the non-exported packages of the modules in the given layer
182 */
183 void addNonExportedPackages(ModuleLayer layer);
184
185 /**
186 * Invalidate package access cache
187 */
188 void invalidatePackageAccessCache();
189
190 /**
191 * Defines a new module to the Java virtual machine. The module
192 * is defined to the given class loader.
193 *
194 * The URI is for information purposes only, it can be {@code null}.
195 */
196 Module defineModule(ClassLoader loader, ModuleDescriptor descriptor, URI uri);
197
198 /**
199 * Defines the unnamed module for the given class loader.
200 */
201 Module defineUnnamedModule(ClassLoader loader);
202
203 /**
204 * Updates the readability so that module m1 reads m2. The new read edge
205 * does not result in a strong reference to m2 (m2 can be GC'ed).
206 *
207 * This method is the same as m1.addReads(m2) but without a permission check.
208 */
209 void addReads(Module m1, Module m2);
210
211 /**
212 * Updates module m to read all unnamed modules.
213 */
214 void addReadsAllUnnamed(Module m);
215
216 /**
217 * Updates module m1 to export a package unconditionally.
218 */
219 void addExports(Module m1, String pkg);
220
221 /**
222 * Updates module m1 to export a package to module m2. The export does
223 * not result in a strong reference to m2 (m2 can be GC'ed).
224 */
225 void addExports(Module m1, String pkg, Module m2);
226
227 /**
228 * Updates a module m to export a package to all unnamed modules.
229 */
230 void addExportsToAllUnnamed(Module m, String pkg);
231
232 /**
233 * Updates module m1 to open a package to module m2. Opening the
234 * package does not result in a strong reference to m2 (m2 can be GC'ed).
235 */
236 void addOpens(Module m1, String pkg, Module m2);
237
238 /**
239 * Updates module m to open a package to all unnamed modules.
240 */
241 void addOpensToAllUnnamed(Module m, String pkg);
242
243 /**
244 * Updates module m to open all packages in the given sets.
245 */
246 void addOpensToAllUnnamed(Module m, Set<String> concealedPkgs, Set<String> exportedPkgs);
247
248 /**
249 * Updates module m to use a service.
250 */
251 void addUses(Module m, Class<?> service);
252
253 /**
254 * Returns true if module m reflectively exports a package to other
255 */
256 boolean isReflectivelyExported(Module module, String pn, Module other);
257
258 /**
259 * Returns true if module m reflectively opens a package to other
260 */
261 boolean isReflectivelyOpened(Module module, String pn, Module other);
262
263 /**
264 * Updates module m to allow access to restricted methods.
265 */
266 Module addEnableNativeAccess(Module m);
267
268 /**
269 * Updates all unnamed modules to allow access to restricted methods.
270 */
271 void addEnableNativeAccessToAllUnnamed();
272
273 /**
274 * Ensure that the given module has native access. If not, warn or
275 * throw exception depending on the configuration.
276 */
277 void ensureNativeAccess(Module m, Class<?> owner, String methodName, Class<?> currentClass);
278
279 /**
280 * Returns the ServicesCatalog for the given Layer.
281 */
282 ServicesCatalog getServicesCatalog(ModuleLayer layer);
283
284 /**
285 * Record that this layer has at least one module defined to the given
286 * class loader.
287 */
288 void bindToLoader(ModuleLayer layer, ClassLoader loader);
289
290 /**
291 * Returns an ordered stream of layers. The first element is the
292 * given layer, the remaining elements are its parents, in DFS order.
293 */
294 Stream<ModuleLayer> layers(ModuleLayer layer);
295
296 /**
297 * Returns a stream of the layers that have modules defined to the
298 * given class loader.
299 */
300 Stream<ModuleLayer> layers(ClassLoader loader);
301
302 /**
303 * Count the number of leading positive bytes in the range.
304 */
305 int countPositives(byte[] ba, int off, int len);
306
307 /**
308 * Constructs a new {@code String} by decoding the specified subarray of
309 * bytes using the specified {@linkplain java.nio.charset.Charset charset}.
310 *
311 * The caller of this method shall relinquish and transfer the ownership of
312 * the byte array to the callee since the later will not make a copy.
313 *
314 * @param bytes the byte array source
315 * @param cs the Charset
316 * @return the newly created string
317 * @throws CharacterCodingException for malformed or unmappable bytes
318 */
319 String newStringNoRepl(byte[] bytes, Charset cs) throws CharacterCodingException;
320
321 /**
322 * Encode the given string into a sequence of bytes using the specified Charset.
323 *
324 * This method avoids copying the String's internal representation if the input
325 * is ASCII.
326 *
327 * This method throws CharacterCodingException instead of replacing when
328 * malformed input or unmappable characters are encountered.
329 *
330 * @param s the string to encode
331 * @param cs the charset
332 * @return the encoded bytes
333 * @throws CharacterCodingException for malformed input or unmappable characters
334 */
335 byte[] getBytesNoRepl(String s, Charset cs) throws CharacterCodingException;
336
337 /**
338 * Returns a new string by decoding from the given utf8 bytes array.
339 *
340 * @param off the index of the first byte to decode
341 * @param len the number of bytes to decode
342 * @return the newly created string
343 * @throws IllegalArgumentException for malformed or unmappable bytes.
344 */
345 String newStringUTF8NoRepl(byte[] bytes, int off, int len);
346
347 /**
348 * Get the char at index in a byte[] in internal UTF-16 representation,
349 * with no bounds checks.
350 *
351 * @param bytes the UTF-16 encoded bytes
352 * @param index of the char to retrieve, 0 <= index < (bytes.length >> 1)
353 * @return the char value
354 */
355 char getUTF16Char(byte[] bytes, int index);
356
357 /**
358 * Encode the given string into a sequence of bytes using utf8.
359 *
360 * @param s the string to encode
361 * @return the encoded bytes in utf8
362 * @throws IllegalArgumentException for malformed surrogates
363 */
364 byte[] getBytesUTF8NoRepl(String s);
365
366 /**
367 * Inflated copy from byte[] to char[], as defined by StringLatin1.inflate
368 */
369 void inflateBytesToChars(byte[] src, int srcOff, char[] dst, int dstOff, int len);
370
371 /**
372 * Decodes ASCII from the source byte array into the destination
373 * char array.
374 *
375 * @return the number of bytes successfully decoded, at most len
376 */
377 int decodeASCII(byte[] src, int srcOff, char[] dst, int dstOff, int len);
378
379 /**
380 * Returns the initial `System.in` to determine if it is replaced
381 * with `System.setIn(newIn)` method
382 */
383 InputStream initialSystemIn();
384
385 /**
386 * Encodes ASCII codepoints as possible from the source array into
387 * the destination byte array, assuming that the encoding is ASCII
388 * compatible
389 *
390 * @return the number of bytes successfully encoded, or 0 if none
391 */
392 int encodeASCII(char[] src, int srcOff, byte[] dst, int dstOff, int len);
393
394 /**
395 * Set the cause of Throwable
396 * @param cause set t's cause to new value
397 */
398 void setCause(Throwable t, Throwable cause);
399
400 /**
401 * Get protection domain of the given Class
402 */
403 ProtectionDomain protectionDomain(Class<?> c);
404
405 /**
406 * Get a method handle of string concat helper method
407 */
408 MethodHandle stringConcatHelper(String name, MethodType methodType);
409
410 /**
411 * Get the string concat initial coder
412 */
413 long stringConcatInitialCoder();
414
415 /**
416 * Update lengthCoder for constant
417 */
418 long stringConcatMix(long lengthCoder, String constant);
419
420 /**
421 * Get the coder for the supplied character.
422 */
423 @PreviewFeature(feature=PreviewFeature.Feature.STRING_TEMPLATES)
424 long stringConcatCoder(char value);
425
426 /**
427 * Update lengthCoder for StringBuilder.
428 */
429 @PreviewFeature(feature=PreviewFeature.Feature.STRING_TEMPLATES)
430 long stringBuilderConcatMix(long lengthCoder, StringBuilder sb);
431
432 /**
433 * Prepend StringBuilder content.
434 */
435 @PreviewFeature(feature=PreviewFeature.Feature.STRING_TEMPLATES)
436 long stringBuilderConcatPrepend(long lengthCoder, byte[] buf, StringBuilder sb);
437
438 /**
439 * Join strings
440 */
441 String join(String prefix, String suffix, String delimiter, String[] elements, int size);
442
443 /*
444 * Get the class data associated with the given class.
445 * @param c the class
446 * @see java.lang.invoke.MethodHandles.Lookup#defineHiddenClass(byte[], boolean, MethodHandles.Lookup.ClassOption...)
447 */
448 Object classData(Class<?> c);
449
450 long findNative(ClassLoader loader, String entry);
451
452 /**
453 * Direct access to Shutdown.exit to avoid security manager checks
454 * @param statusCode the status code
455 */
456 void exit(int statusCode);
457
458 /**
459 * Returns an array of all platform threads.
460 */
461 Thread[] getAllThreads();
462
463 /**
464 * Returns the ThreadContainer for a thread, may be null.
465 */
466 ThreadContainer threadContainer(Thread thread);
467
468 /**
469 * Starts a thread in the given ThreadContainer.
470 */
471 void start(Thread thread, ThreadContainer container);
472
473 /**
474 * Returns the top of the given thread's stackable scope stack.
475 */
476 StackableScope headStackableScope(Thread thread);
477
478 /**
479 * Sets the top of the current thread's stackable scope stack.
480 */
481 void setHeadStackableScope(StackableScope scope);
482
483 /**
484 * Returns the Thread object for the current platform thread. If the
485 * current thread is a virtual thread then this method returns the carrier.
486 */
487 Thread currentCarrierThread();
488
489 /**
490 * Executes the given value returning task on the current carrier thread.
491 */
492 <V> V executeOnCarrierThread(Callable<V> task) throws Exception;
493
494 /**
495 * Returns the value of the current carrier thread's copy of a thread-local.
496 */
497 <T> T getCarrierThreadLocal(CarrierThreadLocal<T> local);
498
499 /**
500 * Sets the value of the current carrier thread's copy of a thread-local.
501 */
502 <T> void setCarrierThreadLocal(CarrierThreadLocal<T> local, T value);
503
504 /**
505 * Removes the value of the current carrier thread's copy of a thread-local.
506 */
507 void removeCarrierThreadLocal(CarrierThreadLocal<?> local);
508
509 /**
510 * Returns {@code true} if there is a value in the current carrier thread's copy of
511 * thread-local, even if that values is {@code null}.
512 */
513 boolean isCarrierThreadLocalPresent(CarrierThreadLocal<?> local);
514
515 /**
516 * Returns the current thread's scoped values cache
517 */
518 Object[] scopedValueCache();
519
520 /**
521 * Sets the current thread's scoped values cache
522 */
523 void setScopedValueCache(Object[] cache);
524
525 /**
526 * Return the current thread's scoped value bindings.
527 */
528 Object scopedValueBindings();
529
530 /**
531 * Returns the innermost mounted continuation
532 */
533 Continuation getContinuation(Thread thread);
534
535 /**
536 * Sets the innermost mounted continuation
537 */
538 void setContinuation(Thread thread, Continuation continuation);
539
540 /**
541 * The ContinuationScope of virtual thread continuations
542 */
543 ContinuationScope virtualThreadContinuationScope();
544
545 /**
546 * Parks the current virtual thread.
547 * @throws WrongThreadException if the current thread is not a virtual thread
548 */
549 void parkVirtualThread();
550
551 /**
552 * Parks the current virtual thread for up to the given waiting time.
553 * @param nanos the maximum number of nanoseconds to wait
554 * @throws WrongThreadException if the current thread is not a virtual thread
555 */
556 void parkVirtualThread(long nanos);
557
558 /**
559 * Re-enables a virtual thread for scheduling. If the thread was parked then
560 * it will be unblocked, otherwise its next attempt to park will not block
561 * @param thread the virtual thread to unpark
562 * @throws IllegalArgumentException if the thread is not a virtual thread
563 * @throws RejectedExecutionException if the scheduler cannot accept a task
564 */
565 void unparkVirtualThread(Thread thread);
566
567 /**
568 * Creates a new StackWalker
569 */
570 StackWalker newStackWalkerInstance(Set<StackWalker.Option> options,
571 ContinuationScope contScope,
572 Continuation continuation);
573 /**
574 * Returns '<loader-name>' @<id> if classloader has a name
575 * explicitly set otherwise <qualified-class-name> @<id>
576 */
577 String getLoaderNameID(ClassLoader loader);
578
579 /**
580 * Copy the string bytes to an existing segment, avoiding intermediate copies.
581 */
582 void copyToSegmentRaw(String string, MemorySegment segment, long offset);
583
584 /**
585 * Are the string bytes compatible with the given charset?
586 */
587 boolean bytesCompatible(String string, Charset charset);
588 }