1 /*
2 * Copyright (c) 2003, 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 jdk.internal.access;
27
28 import java.io.InputStream;
29 import java.io.PrintStream;
30 import java.lang.annotation.Annotation;
31 import java.lang.foreign.MemorySegment;
32 import java.lang.foreign.SymbolLookup;
33 import java.lang.invoke.MethodHandle;
34 import java.lang.invoke.MethodType;
35 import java.lang.module.ModuleDescriptor;
36 import java.lang.reflect.Executable;
37 import java.lang.reflect.Method;
38 import java.net.URI;
39 import java.nio.charset.CharacterCodingException;
40 import java.nio.charset.Charset;
41 import java.security.ProtectionDomain;
42 import java.util.List;
43 import java.util.Map;
44 import java.util.Set;
45 import java.util.concurrent.ConcurrentHashMap;
46 import java.util.concurrent.Executor;
47 import java.util.concurrent.RejectedExecutionException;
48 import java.util.stream.Stream;
49
50 import jdk.internal.loader.NativeLibraries;
51 import jdk.internal.misc.CarrierThreadLocal;
52 import jdk.internal.module.ServicesCatalog;
53 import jdk.internal.reflect.ConstantPool;
54 import jdk.internal.vm.Continuation;
55 import jdk.internal.vm.ContinuationScope;
56 import jdk.internal.vm.StackableScope;
57 import jdk.internal.vm.ThreadContainer;
58 import sun.reflect.annotation.AnnotationType;
59 import sun.nio.ch.Interruptible;
60
61 public interface JavaLangAccess {
62
63 /**
64 * Returns the list of {@code Method} objects for the declared public
65 * methods of this class or interface that have the specified method name
66 * and parameter types.
67 */
68 List<Method> getDeclaredPublicMethods(Class<?> klass, String name, Class<?>... parameterTypes);
69
70 /**
71 * Return most specific method that matches name and parameterTypes.
72 */
73 Method findMethod(Class<?> klass, boolean publicOnly, String name, Class<?>... parameterTypes);
74
75 /**
76 * Return the constant pool for a class.
77 */
78 ConstantPool getConstantPool(Class<?> klass);
79
80 /**
81 * Compare-And-Set the AnnotationType instance corresponding to this class.
82 * (This method only applies to annotation types.)
83 */
84 boolean casAnnotationType(Class<?> klass, AnnotationType oldType, AnnotationType newType);
85
86 /**
87 * Get the AnnotationType instance corresponding to this class.
88 * (This method only applies to annotation types.)
89 */
90 AnnotationType getAnnotationType(Class<?> klass);
91
92 /**
93 * Get the declared annotations for a given class, indexed by their types.
94 */
95 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap(Class<?> klass);
96
97 /**
98 * Get the array of bytes that is the class-file representation
99 * of this Class' annotations.
100 */
101 byte[] getRawClassAnnotations(Class<?> klass);
102
103 /**
104 * Get the array of bytes that is the class-file representation
105 * of this Class' type annotations.
106 */
107 byte[] getRawClassTypeAnnotations(Class<?> klass);
108
109 /**
110 * Get the array of bytes that is the class-file representation
111 * of this Executable's type annotations.
112 */
113 byte[] getRawExecutableTypeAnnotations(Executable executable);
114
115 /**
116 * Returns the elements of an enum class or null if the
117 * Class object does not represent an enum type;
118 * the result is uncloned, cached, and shared by all callers.
119 */
120 <E extends Enum<E>> E[] getEnumConstantsShared(Class<E> klass);
121
122 /**
123 * Set current thread's blocker field.
124 */
125 void blockedOn(Interruptible b);
126
127 /**
128 * Registers a shutdown hook.
129 *
130 * It is expected that this method with registerShutdownInProgress=true
131 * is only used to register DeleteOnExitHook since the first file
132 * may be added to the delete on exit list by the application shutdown
133 * hooks.
134 *
135 * @param slot the slot in the shutdown hook array, whose element
136 * will be invoked in order during shutdown
137 * @param registerShutdownInProgress true to allow the hook
138 * to be registered even if the shutdown is in progress.
139 * @param hook the hook to be registered
140 *
141 * @throws IllegalStateException if shutdown is in progress and
142 * the slot is not valid to register.
143 */
144 void registerShutdownHook(int slot, boolean registerShutdownInProgress, Runnable hook);
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 * Defines a new module to the Java virtual machine. The module
182 * is defined to the given class loader.
183 *
184 * The URI is for information purposes only, it can be {@code null}.
185 */
186 Module defineModule(ClassLoader loader, ModuleDescriptor descriptor, URI uri);
187
188 /**
189 * Defines the unnamed module for the given class loader.
190 */
191 Module defineUnnamedModule(ClassLoader loader);
192
193 /**
194 * Updates the readability so that module m1 reads m2. The new read edge
195 * does not result in a strong reference to m2 (m2 can be GC'ed).
196 *
197 * This method is the same as m1.addReads(m2) but without a permission check.
198 */
199 void addReads(Module m1, Module m2);
200
201 /**
202 * Updates module m to read all unnamed modules.
203 */
204 void addReadsAllUnnamed(Module m);
205
206 /**
207 * Updates module m1 to export a package unconditionally.
208 */
209 void addExports(Module m1, String pkg);
210
211 /**
212 * Updates module m1 to export a package to module m2. The export does
213 * not result in a strong reference to m2 (m2 can be GC'ed).
214 */
215 void addExports(Module m1, String pkg, Module m2);
216
217 /**
218 * Updates a module m to export a package to all unnamed modules.
219 */
220 void addExportsToAllUnnamed(Module m, String pkg);
221
222 /**
223 * Updates module m1 to open a package to module m2. Opening the
224 * package does not result in a strong reference to m2 (m2 can be GC'ed).
225 */
226 void addOpens(Module m1, String pkg, Module m2);
227
228 /**
229 * Updates module m to open a package to all unnamed modules.
230 */
231 void addOpensToAllUnnamed(Module m, String pkg);
232
233 /**
234 * Updates module m to use a service.
235 */
236 void addUses(Module m, Class<?> service);
237
238 /**
239 * Returns true if module m reflectively exports a package to other
240 */
241 boolean isReflectivelyExported(Module module, String pn, Module other);
242
243 /**
244 * Returns true if module m reflectively opens a package to other
245 */
246 boolean isReflectivelyOpened(Module module, String pn, Module other);
247
248 /**
249 * Updates module m to allow access to restricted methods.
250 */
251 Module addEnableNativeAccess(Module m);
252
253 /**
254 * Updates module named {@code name} in layer {@code layer} to allow access to restricted methods.
255 * Returns true iff the given module exists in the given layer.
256 */
257 boolean addEnableNativeAccess(ModuleLayer layer, String name);
258
259 /**
260 * Updates all unnamed modules to allow access to restricted methods.
261 */
262 void addEnableNativeAccessToAllUnnamed();
263
264 /**
265 * Ensure that the given module has native access. If not, warn or throw exception depending on the configuration.
266 * @param m the module in which native access occurred
267 * @param owner the owner of the restricted method being called (or the JNI method being bound)
268 * @param methodName the name of the restricted method being called (or the JNI method being bound)
269 * @param currentClass the class calling the restricted method (for JNI, this is the same as {@code owner})
270 * @param jni {@code true}, if this event is related to a JNI method being bound
271 */
272 void ensureNativeAccess(Module m, Class<?> owner, String methodName, Class<?> currentClass, boolean jni);
273
274 /**
275 * Returns the ServicesCatalog for the given Layer.
276 */
277 ServicesCatalog getServicesCatalog(ModuleLayer layer);
278
279 /**
280 * Record that this layer has at least one module defined to the given
281 * class loader.
282 */
283 void bindToLoader(ModuleLayer layer, ClassLoader loader);
284
285 /**
286 * Returns an ordered stream of layers. The first element is the
287 * given layer, the remaining elements are its parents, in DFS order.
288 */
289 Stream<ModuleLayer> layers(ModuleLayer layer);
290
291 /**
292 * Returns a stream of the layers that have modules defined to the
293 * given class loader.
294 */
295 Stream<ModuleLayer> layers(ClassLoader loader);
296
297 /**
298 * Count the number of leading positive bytes in the range.
299 */
300 int countPositives(byte[] ba, int off, int len);
301
302 /**
303 * Count the number of leading non-zero ascii chars in the String.
304 */
305 int countNonZeroAscii(String s);
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 * Put the char at index in a byte[] in internal UTF-16 representation,
359 * with no bounds checks.
360 *
361 * @param bytes the UTF-16 encoded bytes
362 * @param index of the char to retrieve, 0 <= index < (bytes.length >> 1)
363 */
364 void putCharUTF16(byte[] bytes, int index, int ch);
365
366 /**
367 * Encode the given string into a sequence of bytes using utf8.
368 *
369 * @param s the string to encode
370 * @return the encoded bytes in utf8
371 * @throws IllegalArgumentException for malformed surrogates
372 */
373 byte[] getBytesUTF8NoRepl(String s);
374
375 /**
376 * Inflated copy from byte[] to char[], as defined by StringLatin1.inflate
377 */
378 void inflateBytesToChars(byte[] src, int srcOff, char[] dst, int dstOff, int len);
379
380 /**
381 * Decodes ASCII from the source byte array into the destination
382 * char array.
383 *
384 * @return the number of bytes successfully decoded, at most len
385 */
386 int decodeASCII(byte[] src, int srcOff, char[] dst, int dstOff, int len);
387
388 /**
389 * Returns the initial `System.in` to determine if it is replaced
390 * with `System.setIn(newIn)` method
391 */
392 InputStream initialSystemIn();
393
394 /**
395 * Returns the initial value of System.err.
396 */
397 PrintStream initialSystemErr();
398
399 /**
400 * Encodes ASCII codepoints as possible from the source array into
401 * the destination byte array, assuming that the encoding is ASCII
402 * compatible
403 *
404 * @return the number of bytes successfully encoded, or 0 if none
405 */
406 int encodeASCII(char[] src, int srcOff, byte[] dst, int dstOff, int len);
407
408 /**
409 * Set the cause of Throwable
410 * @param cause set t's cause to new value
411 */
412 void setCause(Throwable t, Throwable cause);
413
414 /**
415 * Get protection domain of the given Class
416 */
417 ProtectionDomain protectionDomain(Class<?> c);
418
419 /**
420 * Get a method handle of string concat helper method
421 */
422 MethodHandle stringConcatHelper(String name, MethodType methodType);
423
424 /**
425 * Get the string concat initial coder
426 */
427 long stringConcatInitialCoder();
428
429 /**
430 * Update lengthCoder for constant
431 */
432 long stringConcatMix(long lengthCoder, String constant);
433
434 /**
435 * Mix value length and coder into current length and coder.
436 */
437 long stringConcatMix(long lengthCoder, char value);
438
439 Object stringConcat1(String[] constants);
440
441 /**
442 * Get the string initial coder, When COMPACT_STRINGS is on, it returns 0, and when it is off, it returns 1.
443 */
444 byte stringInitCoder();
445
446 /**
447 * Get the Coder of String, which is used by StringConcatFactory to calculate the initCoder of constants
448 */
449 byte stringCoder(String str);
450
451 /**
452 * Join strings
453 */
454 String join(String prefix, String suffix, String delimiter, String[] elements, int size);
455
456 /**
457 * Concatenation of prefix and suffix characters to a String for early bootstrap
458 */
459 String concat(String prefix, Object value, String suffix);
460
461 /*
462 * Get the class data associated with the given class.
463 * @param c the class
464 * @see java.lang.invoke.MethodHandles.Lookup#defineHiddenClass(byte[], boolean, MethodHandles.Lookup.ClassOption...)
465 */
466 Object classData(Class<?> c);
467
468 /**
469 * Returns the {@link NativeLibraries} object associated with the provided class loader.
470 * This is used by {@link SymbolLookup#loaderLookup()}.
471 */
472 NativeLibraries nativeLibrariesFor(ClassLoader loader);
473
474 /**
475 * Returns an array of all platform threads.
476 */
477 Thread[] getAllThreads();
478
479 /**
480 * Returns the ThreadContainer for a thread, may be null.
481 */
482 ThreadContainer threadContainer(Thread thread);
483
484 /**
485 * Starts a thread in the given ThreadContainer.
486 */
487 void start(Thread thread, ThreadContainer container);
488
489 /**
490 * Returns the top of the given thread's stackable scope stack.
491 */
492 StackableScope headStackableScope(Thread thread);
493
494 /**
495 * Sets the top of the current thread's stackable scope stack.
496 */
497 void setHeadStackableScope(StackableScope scope);
498
499 /**
500 * Returns the Thread object for the current platform thread. If the
501 * current thread is a virtual thread then this method returns the carrier.
502 */
503 Thread currentCarrierThread();
504
505 /**
506 * Returns the value of the current carrier thread's copy of a thread-local.
507 */
508 <T> T getCarrierThreadLocal(CarrierThreadLocal<T> local);
509
510 /**
511 * Sets the value of the current carrier thread's copy of a thread-local.
512 */
513 <T> void setCarrierThreadLocal(CarrierThreadLocal<T> local, T value);
514
515 /**
516 * Removes the value of the current carrier thread's copy of a thread-local.
517 */
518 void removeCarrierThreadLocal(CarrierThreadLocal<?> local);
519
520 /**
521 * Returns {@code true} if there is a value in the current carrier thread's copy of
522 * thread-local, even if that values is {@code null}.
523 */
524 boolean isCarrierThreadLocalPresent(CarrierThreadLocal<?> local);
525
526 /**
527 * Returns the current thread's scoped values cache
528 */
529 Object[] scopedValueCache();
530
531 /**
532 * Sets the current thread's scoped values cache
533 */
534 void setScopedValueCache(Object[] cache);
535
536 /**
537 * Return the current thread's scoped value bindings.
538 */
539 Object scopedValueBindings();
540
541 /**
542 * Returns the innermost mounted continuation
543 */
544 Continuation getContinuation(Thread thread);
545
546 /**
547 * Sets the innermost mounted continuation
548 */
549 void setContinuation(Thread thread, Continuation continuation);
550
551 /**
552 * The ContinuationScope of virtual thread continuations
553 */
554 ContinuationScope virtualThreadContinuationScope();
555
556 /**
557 * Parks the current virtual thread.
558 * @throws WrongThreadException if the current thread is not a virtual thread
559 */
560 void parkVirtualThread();
561
562 /**
563 * Parks the current virtual thread for up to the given waiting time.
564 * @param nanos the maximum number of nanoseconds to wait
565 * @throws WrongThreadException if the current thread is not a virtual thread
566 */
567 void parkVirtualThread(long nanos);
568
569 /**
570 * Re-enables a virtual thread for scheduling. If the thread was parked then
571 * it will be unblocked, otherwise its next attempt to park will not block
572 * @param thread the virtual thread to unpark
573 * @throws IllegalArgumentException if the thread is not a virtual thread
574 * @throws RejectedExecutionException if the scheduler cannot accept a task
575 */
576 void unparkVirtualThread(Thread thread);
577
578 /**
579 * Returns the virtual thread default scheduler.
580 */
581 Executor virtualThreadDefaultScheduler();
582
583 /**
584 * Creates a new StackWalker
585 */
586 StackWalker newStackWalkerInstance(Set<StackWalker.Option> options,
587 ContinuationScope contScope,
588 Continuation continuation);
589 /**
590 * Returns '<loader-name>' @<id> if classloader has a name
591 * explicitly set otherwise <qualified-class-name> @<id>
592 */
593 String getLoaderNameID(ClassLoader loader);
594
595 /**
596 * Copy the string bytes to an existing segment, avoiding intermediate copies.
597 */
598 void copyToSegmentRaw(String string, MemorySegment segment, long offset);
599
600 /**
601 * Are the string bytes compatible with the given charset?
602 */
603 boolean bytesCompatible(String string, Charset charset);
604 }