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