1 /*
2 * Copyright (c) 1997, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/classListParser.hpp"
27 #include "cds/classListWriter.hpp"
28 #include "cds/dynamicArchive.hpp"
29 #include "cds/heapShared.hpp"
30 #include "cds/lambdaFormInvokers.hpp"
31 #include "classfile/classFileStream.hpp"
32 #include "classfile/classLoader.inline.hpp"
33 #include "classfile/classLoaderData.hpp"
34 #include "classfile/classLoaderData.inline.hpp"
35 #include "classfile/classLoadInfo.hpp"
36 #include "classfile/javaAssertions.hpp"
37 #include "classfile/javaClasses.inline.hpp"
38 #include "classfile/moduleEntry.hpp"
39 #include "classfile/modules.hpp"
40 #include "classfile/packageEntry.hpp"
41 #include "classfile/stringTable.hpp"
42 #include "classfile/symbolTable.hpp"
43 #include "classfile/systemDictionary.hpp"
44 #include "classfile/vmClasses.hpp"
45 #include "classfile/vmSymbols.hpp"
46 #include "gc/shared/collectedHeap.inline.hpp"
47 #include "interpreter/bytecode.hpp"
48 #include "interpreter/bytecodeUtils.hpp"
49 #include "jfr/jfrEvents.hpp"
50 #include "jvm.h"
51 #include "logging/log.hpp"
52 #include "memory/oopFactory.hpp"
53 #include "memory/referenceType.hpp"
54 #include "memory/resourceArea.hpp"
55 #include "memory/universe.hpp"
56 #include "oops/access.inline.hpp"
57 #include "oops/constantPool.hpp"
58 #include "oops/fieldStreams.inline.hpp"
59 #include "oops/instanceKlass.hpp"
60 #include "oops/klass.inline.hpp"
61 #include "oops/method.hpp"
62 #include "oops/recordComponent.hpp"
63 #include "oops/objArrayKlass.hpp"
64 #include "oops/objArrayOop.inline.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "prims/jvm_misc.hpp"
67 #include "prims/jvmtiExport.hpp"
68 #include "prims/jvmtiThreadState.inline.hpp"
69 #include "prims/stackwalk.hpp"
70 #include "runtime/arguments.hpp"
71 #include "runtime/atomic.hpp"
72 #include "runtime/continuation.hpp"
73 #include "runtime/globals_extension.hpp"
74 #include "runtime/handles.inline.hpp"
75 #include "runtime/init.hpp"
76 #include "runtime/interfaceSupport.inline.hpp"
77 #include "runtime/deoptimization.hpp"
78 #include "runtime/handshake.hpp"
79 #include "runtime/java.hpp"
80 #include "runtime/javaCalls.hpp"
81 #include "runtime/javaThread.hpp"
82 #include "runtime/jfieldIDWorkaround.hpp"
83 #include "runtime/jniHandles.inline.hpp"
84 #include "runtime/os.inline.hpp"
85 #include "runtime/osThread.hpp"
86 #include "runtime/perfData.hpp"
87 #include "runtime/reflection.hpp"
88 #include "runtime/synchronizer.hpp"
89 #include "runtime/threadIdentifier.hpp"
90 #include "runtime/threadSMR.hpp"
91 #include "runtime/vframe.inline.hpp"
92 #include "runtime/vmOperations.hpp"
93 #include "runtime/vm_version.hpp"
94 #include "services/attachListener.hpp"
95 #include "services/management.hpp"
96 #include "services/threadService.hpp"
97 #include "utilities/copy.hpp"
98 #include "utilities/defaultStream.hpp"
99 #include "utilities/dtrace.hpp"
100 #include "utilities/events.hpp"
101 #include "utilities/macros.hpp"
102 #include "utilities/utf8.hpp"
103 #if INCLUDE_CDS
104 #include "classfile/systemDictionaryShared.hpp"
105 #endif
106 #if INCLUDE_JFR
107 #include "jfr/jfr.hpp"
108 #endif
109 #if INCLUDE_MANAGEMENT
110 #include "services/finalizerService.hpp"
111 #endif
112
113 #include <errno.h>
114
115 /*
116 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
117 such ctors and calls MUST NOT come between an oop declaration/init and its
118 usage because if objects are move this may cause various memory stomps, bus
119 errors and segfaults. Here is a cookbook for causing so called "naked oop
120 failures":
121
122 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
123 // Object address to be held directly in mirror & not visible to GC
124 oop mirror = JNIHandles::resolve_non_null(ofClass);
125
126 // If this ctor can hit a safepoint, moving objects around, then
127 ComplexConstructor foo;
128
129 // Boom! mirror may point to JUNK instead of the intended object
130 (some dereference of mirror)
131
132 // Here's another call that may block for GC, making mirror stale
133 MutexLocker ml(some_lock);
134
135 // And here's an initializer that can result in a stale oop
136 // all in one step.
137 oop o = call_that_can_throw_exception(TRAPS);
138
139
140 The solution is to keep the oop declaration BELOW the ctor or function
141 call that might cause a GC, do another resolve to reassign the oop, or
142 consider use of a Handle instead of an oop so there is immunity from object
143 motion. But note that the "QUICK" entries below do not have a handlemark
144 and thus can only support use of handles passed in.
145 */
146
147 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
148 ResourceMark rm;
149 int line_number = -1;
150 const char * source_file = nullptr;
151 const char * trace = "explicit";
152 InstanceKlass* caller = nullptr;
153 JavaThread* jthread = THREAD;
154 if (jthread->has_last_Java_frame()) {
155 vframeStream vfst(jthread);
156
157 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
158 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
159 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
160 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
161 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
162
163 Method* last_caller = nullptr;
164
165 while (!vfst.at_end()) {
166 Method* m = vfst.method();
167 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
168 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
169 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
170 break;
171 }
172 last_caller = m;
173 vfst.next();
174 }
175 // if this is called from Class.forName0 and that is called from Class.forName,
176 // then print the caller of Class.forName. If this is Class.loadClass, then print
177 // that caller, otherwise keep quiet since this should be picked up elsewhere.
178 bool found_it = false;
179 if (!vfst.at_end() &&
180 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
181 vfst.method()->name() == vmSymbols::forName0_name()) {
182 vfst.next();
183 if (!vfst.at_end() &&
184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
185 vfst.method()->name() == vmSymbols::forName_name()) {
186 vfst.next();
187 found_it = true;
188 }
189 } else if (last_caller != nullptr &&
190 last_caller->method_holder()->name() ==
191 vmSymbols::java_lang_ClassLoader() &&
192 last_caller->name() == vmSymbols::loadClass_name()) {
193 found_it = true;
194 } else if (!vfst.at_end()) {
195 if (vfst.method()->is_native()) {
196 // JNI call
197 found_it = true;
198 }
199 }
200 if (found_it && !vfst.at_end()) {
201 // found the caller
202 caller = vfst.method()->method_holder();
203 line_number = vfst.method()->line_number_from_bci(vfst.bci());
204 if (line_number == -1) {
205 // show method name if it's a native method
206 trace = vfst.method()->name_and_sig_as_C_string();
207 }
208 Symbol* s = caller->source_file_name();
209 if (s != nullptr) {
210 source_file = s->as_C_string();
211 }
212 }
213 }
214 if (caller != nullptr) {
215 if (to_class != caller) {
216 const char * from = caller->external_name();
217 const char * to = to_class->external_name();
218 // print in a single call to reduce interleaving between threads
219 if (source_file != nullptr) {
220 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
221 } else {
222 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
223 }
224 }
225 }
226 }
227
228 void trace_class_resolution(Klass* to_class) {
229 EXCEPTION_MARK;
230 trace_class_resolution_impl(to_class, THREAD);
231 if (HAS_PENDING_EXCEPTION) {
232 CLEAR_PENDING_EXCEPTION;
233 }
234 }
235
236 // java.lang.System //////////////////////////////////////////////////////////////////////
237
238
239 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
240 return os::javaTimeMillis();
241 JVM_END
242
243 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
244 return os::javaTimeNanos();
245 JVM_END
246
247 // The function below is actually exposed by jdk.internal.misc.VM and not
248 // java.lang.System, but we choose to keep it here so that it stays next
249 // to JVM_CurrentTimeMillis and JVM_NanoTime
250
251 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
252 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
253
254 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
255 jlong seconds;
256 jlong nanos;
257
258 os::javaTimeSystemUTC(seconds, nanos);
259
260 // We're going to verify that the result can fit in a long.
261 // For that we need the difference in seconds between 'seconds'
262 // and 'offset_secs' to be such that:
263 // |seconds - offset_secs| < (2^63/10^9)
264 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
265 // which makes |seconds - offset_secs| < 2^33
266 // and we will prefer +/- 2^32 as the maximum acceptable diff
267 // as 2^32 has a more natural feel than 2^33...
268 //
269 // So if |seconds - offset_secs| >= 2^32 - we return a special
270 // sentinel value (-1) which the caller should take as an
271 // exception value indicating that the offset given to us is
272 // too far from range of the current time - leading to too big
273 // a nano adjustment. The caller is expected to recover by
274 // computing a more accurate offset and calling this method
275 // again. (For the record 2^32 secs is ~136 years, so that
276 // should rarely happen)
277 //
278 jlong diff = seconds - offset_secs;
279 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
280 return -1; // sentinel value: the offset is too far off the target
281 }
282
283 // return the adjustment. If you compute a time by adding
284 // this number of nanoseconds along with the number of seconds
285 // in the offset you should get the current UTC time.
286 return (diff * (jlong)1000000000) + nanos;
287 JVM_END
288
289 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
290 jobject dst, jint dst_pos, jint length))
291 // Check if we have null pointers
292 if (src == nullptr || dst == nullptr) {
293 THROW(vmSymbols::java_lang_NullPointerException());
294 }
295 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
296 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
297 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
298 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
299 // Do copy
300 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
301 JVM_END
302
303
304 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
305 JavaValue r(T_OBJECT);
306 // public synchronized Object put(Object key, Object value);
307 HandleMark hm(THREAD);
308 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
309 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
310 JavaCalls::call_virtual(&r,
311 props,
312 vmClasses::Properties_klass(),
313 vmSymbols::put_name(),
314 vmSymbols::object_object_object_signature(),
315 key_str,
316 value_str,
317 THREAD);
318 }
319
320
321 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
322
323 /*
324 * Return all of the system properties in a Java String array with alternating
325 * names and values from the jvm SystemProperty.
326 * Which includes some internal and all commandline -D defined properties.
327 */
328 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
329 ResourceMark rm(THREAD);
330 HandleMark hm(THREAD);
331 int ndx = 0;
332 int fixedCount = 2;
333
334 SystemProperty* p = Arguments::system_properties();
335 int count = Arguments::PropertyList_count(p);
336
337 // Allocate result String array
338 InstanceKlass* ik = vmClasses::String_klass();
339 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
340 objArrayHandle result_h(THREAD, r);
341
342 while (p != nullptr) {
343 const char * key = p->key();
344 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
345 const char * value = p->value();
346 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
347 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
348 result_h->obj_at_put(ndx * 2, key_str());
349 result_h->obj_at_put(ndx * 2 + 1, value_str());
350 ndx++;
351 }
352 p = p->next();
353 }
354
355 // Convert the -XX:MaxDirectMemorySize= command line flag
356 // to the sun.nio.MaxDirectMemorySize property.
357 // Do this after setting user properties to prevent people
358 // from setting the value with a -D option, as requested.
359 // Leave empty if not supplied
360 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
361 char as_chars[256];
362 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
363 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
364 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
365 result_h->obj_at_put(ndx * 2, key_str());
366 result_h->obj_at_put(ndx * 2 + 1, value_str());
367 ndx++;
368 }
369
370 // JVM monitoring and management support
371 // Add the sun.management.compiler property for the compiler's name
372 {
373 #undef CSIZE
374 #if defined(_LP64) || defined(_WIN64)
375 #define CSIZE "64-Bit "
376 #else
377 #define CSIZE
378 #endif // 64bit
379
380 #if COMPILER1_AND_COMPILER2
381 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
382 #else
383 #if defined(COMPILER1)
384 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
385 #elif defined(COMPILER2)
386 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
387 #elif INCLUDE_JVMCI
388 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
389 #else
390 const char* compiler_name = "";
391 #endif // compilers
392 #endif // COMPILER1_AND_COMPILER2
393
394 if (*compiler_name != '\0' &&
395 (Arguments::mode() != Arguments::_int)) {
396 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
397 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
398 result_h->obj_at_put(ndx * 2, key_str());
399 result_h->obj_at_put(ndx * 2 + 1, value_str());
400 ndx++;
401 }
402 }
403
404 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
405 JVM_END
406
407
408 /*
409 * Return the temporary directory that the VM uses for the attach
410 * and perf data files.
411 *
412 * It is important that this directory is well-known and the
413 * same for all VM instances. It cannot be affected by configuration
414 * variables such as java.io.tmpdir.
415 */
416 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
417 HandleMark hm(THREAD);
418 const char* temp_dir = os::get_temp_directory();
419 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
420 return (jstring) JNIHandles::make_local(THREAD, h());
421 JVM_END
422
423
424 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
425
426 extern volatile jint vm_created;
427
428 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
429 EventShutdown event;
430 if (event.should_commit()) {
431 event.set_reason("Shutdown requested from Java");
432 event.commit();
433 }
434 JVM_END
435
436
437 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
438 before_exit(thread, true);
439 vm_exit(code);
440 JVM_END
441
442
443 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
444 if (!DisableExplicitGC) {
445 EventSystemGC event;
446 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
447 Universe::heap()->collect(GCCause::_java_lang_system_gc);
448 event.commit();
449 }
450 JVM_END
451
452
453 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
454 return Universe::heap()->millis_since_last_whole_heap_examined();
455 JVM_END
456
457
458 static inline jlong convert_size_t_to_jlong(size_t val) {
459 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
460 NOT_LP64 (return (jlong)val;)
461 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
462 }
463
464 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
465 size_t n = Universe::heap()->capacity();
466 return convert_size_t_to_jlong(n);
467 JVM_END
468
469
470 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
471 size_t n = Universe::heap()->unused();
472 return convert_size_t_to_jlong(n);
473 JVM_END
474
475
476 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
477 size_t n = Universe::heap()->max_capacity();
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
483 return os::active_processor_count();
484 JVM_END
485
486 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
487 #ifdef LINUX
488 if (UseContainerSupport) {
489 return JNI_TRUE;
490 }
491 #endif
492 return JNI_FALSE;
493 JVM_END
494
495 // java.lang.Throwable //////////////////////////////////////////////////////
496
497 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
498 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
499 java_lang_Throwable::fill_in_stack_trace(exception);
500 JVM_END
501
502 // java.lang.NullPointerException ///////////////////////////////////////////
503
504 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
505 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
506
507 oop exc = JNIHandles::resolve_non_null(throwable);
508
509 Method* method;
510 int bci;
511 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
512 return nullptr;
513 }
514 if (method->is_native()) {
515 return nullptr;
516 }
517
518 stringStream ss;
519 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
520 if (ok) {
521 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
522 return (jstring) JNIHandles::make_local(THREAD, result);
523 } else {
524 return nullptr;
525 }
526 JVM_END
527
528 // java.lang.StackTraceElement //////////////////////////////////////////////
529
530
531 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
532 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
533 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
534 objArrayHandle stack_trace(THREAD, st);
535 // Fill in the allocated stack trace
536 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
537 JVM_END
538
539
540 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
541 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
542 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
543 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
544 JVM_END
545
546
547 // java.lang.StackWalker //////////////////////////////////////////////////////
548
549
550 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
551 jint skip_frames, jobject contScope, jobject cont,
552 jint frame_count, jint start_index, jobjectArray frames))
553 if (!thread->has_last_Java_frame()) {
554 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
555 }
556
557 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
558 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
559 Handle cont_h(THREAD, JNIHandles::resolve(cont));
560 // frames array is a Class<?>[] array when only getting caller reference,
561 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
562 // be null.
563 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
564 objArrayHandle frames_array_h(THREAD, fa);
565
566 int limit = start_index + frame_count;
567 if (frames_array_h->length() < limit) {
568 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
569 }
570
571 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
572 frame_count, start_index, frames_array_h, CHECK_NULL);
573 return JNIHandles::make_local(THREAD, result);
574 JVM_END
575
576
577 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
578 jint frame_count, jint start_index,
579 jobjectArray frames))
580 // frames array is a Class<?>[] array when only getting caller reference,
581 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
582 // be null.
583 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
584 objArrayHandle frames_array_h(THREAD, fa);
585
586 int limit = start_index+frame_count;
587 if (frames_array_h->length() < limit) {
588 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
589 }
590
591 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
592 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
593 start_index, frames_array_h, THREAD);
594 JVM_END
595
596 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
597 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
598 objArrayHandle frames_array_h(THREAD, fa);
599 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
600 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
601
602 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
603 JVM_END
604
605 // java.lang.Object ///////////////////////////////////////////////
606
607
608 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
609 // as implemented in the classic virtual machine; return 0 if object is null
610 return handle == nullptr ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
611 JVM_END
612
613
614 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
615 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
616 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
617 if (JvmtiExport::should_post_monitor_wait()) {
618 JvmtiExport::post_monitor_wait(thread, obj(), ms);
619
620 // The current thread already owns the monitor and it has not yet
621 // been added to the wait queue so the current thread cannot be
622 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
623 // event handler cannot accidentally consume an unpark() meant for
624 // the ParkEvent associated with this ObjectMonitor.
625 }
626 ObjectSynchronizer::wait(obj, ms, CHECK);
627 JVM_END
628
629
630 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
631 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
632 ObjectSynchronizer::notify(obj, CHECK);
633 JVM_END
634
635
636 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
637 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
638 ObjectSynchronizer::notifyall(obj, CHECK);
639 JVM_END
640
641
642 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
643 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
644 Klass* klass = obj->klass();
645 JvmtiVMObjectAllocEventCollector oam;
646
647 #ifdef ASSERT
648 // Just checking that the cloneable flag is set correct
649 if (obj->is_array()) {
650 guarantee(klass->is_cloneable(), "all arrays are cloneable");
651 } else {
652 guarantee(obj->is_instance(), "should be instanceOop");
653 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
654 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
655 }
656 #endif
657
658 // Check if class of obj supports the Cloneable interface.
659 // All arrays are considered to be cloneable (See JLS 20.1.5).
660 // All j.l.r.Reference classes are considered non-cloneable.
661 if (!klass->is_cloneable() ||
662 (klass->is_instance_klass() &&
663 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
664 ResourceMark rm(THREAD);
665 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
666 }
667
668 // Make shallow object copy
669 const size_t size = obj->size();
670 oop new_obj_oop = nullptr;
671 if (obj->is_array()) {
672 const int length = ((arrayOop)obj())->length();
673 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
674 /* do_zero */ true, CHECK_NULL);
675 } else {
676 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
677 }
678
679 HeapAccess<>::clone(obj(), new_obj_oop, size);
680
681 Handle new_obj(THREAD, new_obj_oop);
682 // Caution: this involves a java upcall, so the clone should be
683 // "gc-robust" by this stage.
684 if (klass->has_finalizer()) {
685 assert(obj->is_instance(), "should be instanceOop");
686 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
687 new_obj = Handle(THREAD, new_obj_oop);
688 }
689
690 return JNIHandles::make_local(THREAD, new_obj());
691 JVM_END
692
693 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
694
695 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
696 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
697 JVM_END
698
699 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
700 return InstanceKlass::is_finalization_enabled();
701 JVM_END
702
703 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
704
705 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
706 CONT_RegisterNativeMethods(env, cls);
707 JVM_END
708
709 // java.io.File ///////////////////////////////////////////////////////////////
710
711 JVM_LEAF(char*, JVM_NativePath(char* path))
712 return os::native_path(path);
713 JVM_END
714
715
716 // Misc. class handling ///////////////////////////////////////////////////////////
717
718
719 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
720 // Getting the class of the caller frame.
721 //
722 // The call stack at this point looks something like this:
723 //
724 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
725 // [1] [ @CallerSensitive API.method ]
726 // [.] [ (skipped intermediate frames) ]
727 // [n] [ caller ]
728 vframeStream vfst(thread);
729 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
730 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
731 Method* m = vfst.method();
732 assert(m != nullptr, "sanity");
733 switch (n) {
734 case 0:
735 // This must only be called from Reflection.getCallerClass
736 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
737 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
738 }
739 // fall-through
740 case 1:
741 // Frame 0 and 1 must be caller sensitive.
742 if (!m->caller_sensitive()) {
743 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
744 }
745 break;
746 default:
747 if (!m->is_ignored_by_security_stack_walk()) {
748 // We have reached the desired frame; return the holder class.
749 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
750 }
751 break;
752 }
753 }
754 return nullptr;
755 JVM_END
756
757
758 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
759 oop mirror = nullptr;
760 BasicType t = name2type(utf);
761 if (t != T_ILLEGAL && !is_reference_type(t)) {
762 mirror = Universe::java_mirror(t);
763 }
764 if (mirror == nullptr) {
765 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
766 } else {
767 return (jclass) JNIHandles::make_local(THREAD, mirror);
768 }
769 JVM_END
770
771
772 // Returns a class loaded by the bootstrap class loader; or null
773 // if not found. ClassNotFoundException is not thrown.
774 // FindClassFromBootLoader is exported to the launcher for windows.
775 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
776 const char* name))
777 // Java libraries should ensure that name is never null or illegal.
778 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
779 // It's impossible to create this class; the name cannot fit
780 // into the constant pool.
781 return nullptr;
782 }
783 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
784
785 TempNewSymbol h_name = SymbolTable::new_symbol(name);
786 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
787 if (k == nullptr) {
788 return nullptr;
789 }
790
791 if (log_is_enabled(Debug, class, resolve)) {
792 trace_class_resolution(k);
793 }
794 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
795 JVM_END
796
797 // Find a class with this name in this loader, using the caller's protection domain.
798 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
799 jboolean init, jobject loader,
800 jclass caller))
801 TempNewSymbol h_name =
802 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
803 CHECK_NULL);
804
805 oop loader_oop = JNIHandles::resolve(loader);
806 oop from_class = JNIHandles::resolve(caller);
807 oop protection_domain = nullptr;
808 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
809 // NPE. Put it in another way, the bootstrap class loader has all permission and
810 // thus no checkPackageAccess equivalence in the VM class loader.
811 // The caller is also passed as null by the java code if there is no security
812 // manager to avoid the performance cost of getting the calling class.
813 if (from_class != nullptr && loader_oop != nullptr) {
814 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
815 }
816
817 Handle h_loader(THREAD, loader_oop);
818 Handle h_prot(THREAD, protection_domain);
819 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
820 h_prot, false, THREAD);
821
822 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
823 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
824 }
825 return result;
826 JVM_END
827
828 // Currently only called from the old verifier.
829 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
830 jboolean init, jclass from))
831 TempNewSymbol h_name =
832 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
833 CHECK_NULL);
834 oop from_class_oop = JNIHandles::resolve(from);
835 Klass* from_class = (from_class_oop == nullptr)
836 ? (Klass*)nullptr
837 : java_lang_Class::as_Klass(from_class_oop);
838 oop class_loader = nullptr;
839 oop protection_domain = nullptr;
840 if (from_class != nullptr) {
841 class_loader = from_class->class_loader();
842 protection_domain = from_class->protection_domain();
843 }
844 Handle h_loader(THREAD, class_loader);
845 Handle h_prot (THREAD, protection_domain);
846 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
847 h_prot, true, thread);
848
849 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
850 // this function is generally only used for class loading during verification.
851 ResourceMark rm;
852 oop from_mirror = JNIHandles::resolve_non_null(from);
853 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
854 const char * from_name = from_class->external_name();
855
856 oop mirror = JNIHandles::resolve_non_null(result);
857 Klass* to_class = java_lang_Class::as_Klass(mirror);
858 const char * to = to_class->external_name();
859 log_debug(class, resolve)("%s %s (verification)", from_name, to);
860 }
861
862 return result;
863 JVM_END
864
865 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
866 static jclass jvm_define_class_common(const char *name,
867 jobject loader, const jbyte *buf,
868 jsize len, jobject pd, const char *source,
869 TRAPS) {
870 if (source == nullptr) source = "__JVM_DefineClass__";
871
872 JavaThread* jt = THREAD;
873
874 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
875 ClassLoader::perf_define_appclass_selftime(),
876 ClassLoader::perf_define_appclasses(),
877 jt->get_thread_stat()->perf_recursion_counts_addr(),
878 jt->get_thread_stat()->perf_timers_addr(),
879 PerfClassTraceTime::DEFINE_CLASS);
880
881 if (UsePerfData) {
882 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
883 }
884
885 // Class resolution will get the class name from the .class stream if the name is null.
886 TempNewSymbol class_name = name == nullptr ? nullptr :
887 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
888 CHECK_NULL);
889
890 ResourceMark rm(THREAD);
891 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
892 Handle class_loader (THREAD, JNIHandles::resolve(loader));
893 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
894 ClassLoadInfo cl_info(protection_domain);
895 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
896 class_loader,
897 cl_info,
898 CHECK_NULL);
899
900 if (log_is_enabled(Debug, class, resolve)) {
901 trace_class_resolution(k);
902 }
903
904 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
905 }
906
907 enum {
908 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
909 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
910 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
911 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
912 };
913
914 /*
915 * Define a class with the specified flags that indicates if it's a nestmate,
916 * hidden, or strongly referenced from class loader.
917 */
918 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
919 const jbyte *buf, jsize len, jobject pd,
920 jboolean init, int flags, jobject classData, TRAPS) {
921 ResourceMark rm(THREAD);
922
923 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
924 // Lookup class must be a non-null instance
925 if (lookup_k == nullptr) {
926 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
927 }
928 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
929
930 Handle class_loader (THREAD, lookup_k->class_loader());
931
932 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
933 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
934 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
935 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
936
937 InstanceKlass* host_class = nullptr;
938 if (is_nestmate) {
939 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
940 }
941
942 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
943 name,
944 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
945 is_nestmate ? host_class->external_name() : "",
946 is_hidden ? "hidden" : "not hidden",
947 is_strong ? "strong" : "weak",
948 vm_annotations ? "with vm annotations" : "without vm annotation");
949
950 if (!is_hidden) {
951 // classData is only applicable for hidden classes
952 if (classData != nullptr) {
953 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
954 }
955 if (is_nestmate) {
956 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
957 }
958 if (!is_strong) {
959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
960 }
961 if (vm_annotations) {
962 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
963 }
964 if (flags != STRONG_LOADER_LINK) {
965 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
966 err_msg("invalid flag 0x%x", flags));
967 }
968 }
969
970 // Class resolution will get the class name from the .class stream if the name is null.
971 TempNewSymbol class_name = name == nullptr ? nullptr :
972 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
973 CHECK_NULL);
974
975 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
976 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
977 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
978
979 InstanceKlass* ik = nullptr;
980 if (!is_hidden) {
981 ClassLoadInfo cl_info(protection_domain);
982 ik = SystemDictionary::resolve_from_stream(&st, class_name,
983 class_loader,
984 cl_info,
985 CHECK_NULL);
986
987 if (log_is_enabled(Debug, class, resolve)) {
988 trace_class_resolution(ik);
989 }
990 } else { // hidden
991 Handle classData_h(THREAD, JNIHandles::resolve(classData));
992 ClassLoadInfo cl_info(protection_domain,
993 host_class,
994 classData_h,
995 is_hidden,
996 is_strong,
997 vm_annotations);
998 ik = SystemDictionary::resolve_from_stream(&st, class_name,
999 class_loader,
1000 cl_info,
1001 CHECK_NULL);
1002
1003 // The hidden class loader data has been artificially been kept alive to
1004 // this point. The mirror and any instances of this class have to keep
1005 // it alive afterwards.
1006 ik->class_loader_data()->dec_keep_alive();
1007
1008 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1009 ModuleEntry* module = ik->module();
1010 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1011 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1012 module_name,
1013 ik->external_name(),
1014 host_class->external_name(),
1015 ik->is_hidden() ? "is hidden" : "is not hidden");
1016 }
1017 }
1018 assert(Reflection::is_same_class_package(lookup_k, ik),
1019 "lookup class and defined class are in different packages");
1020
1021 if (init) {
1022 ik->initialize(CHECK_NULL);
1023 } else {
1024 ik->link_class(CHECK_NULL);
1025 }
1026
1027 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1028 }
1029
1030 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1031 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1032 JVM_END
1033
1034 /*
1035 * Define a class with the specified lookup class.
1036 * lookup: Lookup class
1037 * name: the name of the class
1038 * buf: class bytes
1039 * len: length of class bytes
1040 * pd: protection domain
1041 * init: initialize the class
1042 * flags: properties of the class
1043 * classData: private static pre-initialized field
1044 */
1045 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1046 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1047
1048 if (lookup == nullptr) {
1049 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1050 }
1051
1052 assert(buf != nullptr, "buf must not be null");
1053
1054 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1055 JVM_END
1056
1057 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1058
1059 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1060 JVM_END
1061
1062 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1063 ResourceMark rm(THREAD);
1064
1065 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1066 char* str = java_lang_String::as_utf8_string(h_name());
1067
1068 // Sanity check, don't expect null
1069 if (str == nullptr) return nullptr;
1070
1071 // Internalize the string, converting '.' to '/' in string.
1072 char* p = (char*)str;
1073 while (*p != '\0') {
1074 if (*p == '.') {
1075 *p = '/';
1076 }
1077 p++;
1078 }
1079
1080 const int str_len = (int)(p - str);
1081 if (str_len > Symbol::max_length()) {
1082 // It's impossible to create this class; the name cannot fit
1083 // into the constant pool.
1084 return nullptr;
1085 }
1086 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1087
1088 // Security Note:
1089 // The Java level wrapper will perform the necessary security check allowing
1090 // us to pass the null as the initiating class loader.
1091 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1092 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1093 h_loader,
1094 Handle());
1095 #if INCLUDE_CDS
1096 if (k == nullptr) {
1097 // If the class is not already loaded, try to see if it's in the shared
1098 // archive for the current classloader (h_loader).
1099 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1100 }
1101 #endif
1102 return (k == nullptr) ? nullptr :
1103 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1104 JVM_END
1105
1106 // Module support //////////////////////////////////////////////////////////////////////////////
1107
1108 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1109 jstring location, jobjectArray packages))
1110 Handle h_module (THREAD, JNIHandles::resolve(module));
1111 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1112 JVM_END
1113
1114 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1115 Handle h_module (THREAD, JNIHandles::resolve(module));
1116 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1117 JVM_END
1118
1119 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1120 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1121 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1122 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1123 JVM_END
1124
1125 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1126 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1127 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1128 JVM_END
1129
1130 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1131 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1132 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1133 JVM_END
1134
1135 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1136 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1137 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1138 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1139 JVM_END
1140
1141 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1142 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1143 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1144 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1145 JVM_END
1146
1147 // Reflection support //////////////////////////////////////////////////////////////////////////////
1148
1149 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1150 assert (cls != nullptr, "illegal class");
1151 JvmtiVMObjectAllocEventCollector oam;
1152 ResourceMark rm(THREAD);
1153 HandleMark hm(THREAD);
1154 Handle java_class(THREAD, JNIHandles::resolve(cls));
1155 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1156 return (jstring) JNIHandles::make_local(THREAD, result);
1157 JVM_END
1158
1159
1160 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1161 JvmtiVMObjectAllocEventCollector oam;
1162 oop mirror = JNIHandles::resolve_non_null(cls);
1163
1164 // Special handling for primitive objects
1165 if (java_lang_Class::is_primitive(mirror)) {
1166 // Primitive objects does not have any interfaces
1167 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1168 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1169 }
1170
1171 Klass* klass = java_lang_Class::as_Klass(mirror);
1172 // Figure size of result array
1173 int size;
1174 if (klass->is_instance_klass()) {
1175 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1176 } else {
1177 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1178 size = 2;
1179 }
1180
1181 // Allocate result array
1182 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1183 objArrayHandle result (THREAD, r);
1184 // Fill in result
1185 if (klass->is_instance_klass()) {
1186 // Regular instance klass, fill in all local interfaces
1187 for (int index = 0; index < size; index++) {
1188 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1189 result->obj_at_put(index, k->java_mirror());
1190 }
1191 } else {
1192 // All arrays implement java.lang.Cloneable and java.io.Serializable
1193 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1194 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1195 }
1196 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1197 JVM_END
1198
1199
1200 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1201 oop mirror = JNIHandles::resolve_non_null(cls);
1202 if (java_lang_Class::is_primitive(mirror)) {
1203 return JNI_FALSE;
1204 }
1205 Klass* k = java_lang_Class::as_Klass(mirror);
1206 jboolean result = k->is_interface();
1207 assert(!result || k->is_instance_klass(),
1208 "all interfaces are instance types");
1209 // The compiler intrinsic for isInterface tests the
1210 // Klass::_access_flags bits in the same way.
1211 return result;
1212 JVM_END
1213
1214 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1215 oop mirror = JNIHandles::resolve_non_null(cls);
1216 if (java_lang_Class::is_primitive(mirror)) {
1217 return JNI_FALSE;
1218 }
1219 Klass* k = java_lang_Class::as_Klass(mirror);
1220 return k->is_hidden();
1221 JVM_END
1222
1223 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1224 JvmtiVMObjectAllocEventCollector oam;
1225 oop mirror = JNIHandles::resolve_non_null(cls);
1226 if (java_lang_Class::is_primitive(mirror)) {
1227 // There are no signers for primitive types
1228 return nullptr;
1229 }
1230
1231 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1232
1233 // If there are no signers set in the class, or if the class
1234 // is an array, return null.
1235 if (signers == nullptr) return nullptr;
1236
1237 // copy of the signers array
1238 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1239 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1240 for (int index = 0; index < signers->length(); index++) {
1241 signers_copy->obj_at_put(index, signers->obj_at(index));
1242 }
1243
1244 // return the copy
1245 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1246 JVM_END
1247
1248
1249 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1250 oop mirror = JNIHandles::resolve_non_null(cls);
1251 if (!java_lang_Class::is_primitive(mirror)) {
1252 // This call is ignored for primitive types and arrays.
1253 // Signers are only set once, ClassLoader.java, and thus shouldn't
1254 // be called with an array. Only the bootstrap loader creates arrays.
1255 Klass* k = java_lang_Class::as_Klass(mirror);
1256 if (k->is_instance_klass()) {
1257 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1258 }
1259 }
1260 JVM_END
1261
1262
1263 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1264 oop mirror = JNIHandles::resolve_non_null(cls);
1265 if (mirror == nullptr) {
1266 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1267 }
1268
1269 if (java_lang_Class::is_primitive(mirror)) {
1270 // Primitive types does not have a protection domain.
1271 return nullptr;
1272 }
1273
1274 oop pd = java_lang_Class::protection_domain(mirror);
1275 return (jobject) JNIHandles::make_local(THREAD, pd);
1276 JVM_END
1277
1278
1279 // Returns the inherited_access_control_context field of the running thread.
1280 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1281 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1282 return JNIHandles::make_local(THREAD, result);
1283 JVM_END
1284
1285 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1286 if (!UsePrivilegedStack) return nullptr;
1287
1288 ResourceMark rm(THREAD);
1289 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1290 JvmtiVMObjectAllocEventCollector oam;
1291
1292 // count the protection domains on the execution stack. We collapse
1293 // duplicate consecutive protection domains into a single one, as
1294 // well as stopping when we hit a privileged frame.
1295
1296 oop previous_protection_domain = nullptr;
1297 Handle privileged_context(thread, nullptr);
1298 bool is_privileged = false;
1299 oop protection_domain = nullptr;
1300
1301 // Iterate through Java frames
1302 vframeStream vfst(thread);
1303 for(; !vfst.at_end(); vfst.next()) {
1304 // get method of frame
1305 Method* method = vfst.method();
1306
1307 // stop at the first privileged frame
1308 if (method->method_holder() == vmClasses::AccessController_klass() &&
1309 method->name() == vmSymbols::executePrivileged_name())
1310 {
1311 // this frame is privileged
1312 is_privileged = true;
1313
1314 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1315
1316 StackValueCollection* locals = priv->locals();
1317 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1318 StackValue* clr_sv = locals->at(2); // Class<?> caller
1319 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1320 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1321 privileged_context = ctx_sv->get_obj();
1322 Handle caller = clr_sv->get_obj();
1323
1324 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1325 protection_domain = caller_klass->protection_domain();
1326 } else {
1327 protection_domain = method->method_holder()->protection_domain();
1328 }
1329
1330 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1331 local_array->push(Handle(thread, protection_domain));
1332 previous_protection_domain = protection_domain;
1333 }
1334
1335 if (is_privileged) break;
1336 }
1337
1338
1339 // either all the domains on the stack were system domains, or
1340 // we had a privileged system domain
1341 if (local_array->is_empty()) {
1342 if (is_privileged && privileged_context.is_null()) return nullptr;
1343
1344 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1345 return JNIHandles::make_local(THREAD, result);
1346 }
1347
1348 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1349 local_array->length(), CHECK_NULL);
1350 objArrayHandle h_context(thread, context);
1351 for (int index = 0; index < local_array->length(); index++) {
1352 h_context->obj_at_put(index, local_array->at(index)());
1353 }
1354
1355 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1356
1357 return JNIHandles::make_local(THREAD, result);
1358 JVM_END
1359
1360 class ScopedValueBindingsResolver {
1361 public:
1362 InstanceKlass* Carrier_klass;
1363 ScopedValueBindingsResolver(JavaThread* THREAD) {
1364 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_incubator_concurrent_ScopedValue_Carrier(), true, THREAD);
1365 Carrier_klass = InstanceKlass::cast(k);
1366 }
1367 };
1368
1369 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1370 ResourceMark rm(THREAD);
1371 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1372 JvmtiVMObjectAllocEventCollector oam;
1373
1374 static ScopedValueBindingsResolver resolver(THREAD);
1375
1376 // Iterate through Java frames
1377 vframeStream vfst(thread);
1378 for(; !vfst.at_end(); vfst.next()) {
1379 int loc = -1;
1380 // get method of frame
1381 Method* method = vfst.method();
1382
1383 Symbol *name = method->name();
1384
1385 InstanceKlass* holder = method->method_holder();
1386 if (name == vmSymbols::runWith_method_name()) {
1387 if ((holder == resolver.Carrier_klass
1388 || holder == vmClasses::VirtualThread_klass()
1389 || holder == vmClasses::Thread_klass())) {
1390 loc = 1;
1391 }
1392 }
1393
1394 if (loc != -1) {
1395 javaVFrame *frame = vfst.asJavaVFrame();
1396 StackValueCollection* locals = frame->locals();
1397 StackValue* head_sv = locals->at(loc); // jdk/incubator/concurrent/ScopedValue$Snapshot
1398 Handle result = head_sv->get_obj();
1399 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1400 if (result() != nullptr) {
1401 return JNIHandles::make_local(THREAD, result());
1402 }
1403 }
1404 }
1405
1406 return nullptr;
1407 JVM_END
1408
1409 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1410 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1411 return (k != nullptr) && k->is_array_klass() ? true : false;
1412 JVM_END
1413
1414
1415 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1416 oop mirror = JNIHandles::resolve_non_null(cls);
1417 return (jboolean) java_lang_Class::is_primitive(mirror);
1418 JVM_END
1419
1420
1421 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1422 oop mirror = JNIHandles::resolve_non_null(cls);
1423 if (java_lang_Class::is_primitive(mirror)) {
1424 // Primitive type
1425 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1426 }
1427
1428 Klass* k = java_lang_Class::as_Klass(mirror);
1429 debug_only(int computed_modifiers = k->compute_modifier_flags());
1430 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1431 return k->modifier_flags();
1432 JVM_END
1433
1434
1435 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1436
1437 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1438 JvmtiVMObjectAllocEventCollector oam;
1439 // ofClass is a reference to a java_lang_Class object. The mirror object
1440 // of an InstanceKlass
1441 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1442 if (java_lang_Class::is_primitive(ofMirror) ||
1443 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1444 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1445 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1446 }
1447
1448 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1449 InnerClassesIterator iter(k);
1450
1451 if (iter.length() == 0) {
1452 // Neither an inner nor outer class
1453 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1454 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1455 }
1456
1457 // find inner class info
1458 constantPoolHandle cp(thread, k->constants());
1459 int length = iter.length();
1460
1461 // Allocate temp. result array
1462 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1463 objArrayHandle result (THREAD, r);
1464 int members = 0;
1465
1466 for (; !iter.done(); iter.next()) {
1467 int ioff = iter.inner_class_info_index();
1468 int ooff = iter.outer_class_info_index();
1469
1470 if (ioff != 0 && ooff != 0) {
1471 // Check to see if the name matches the class we're looking for
1472 // before attempting to find the class.
1473 if (cp->klass_name_at_matches(k, ooff)) {
1474 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1475 if (outer_klass == k) {
1476 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1477 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1478
1479 // Throws an exception if outer klass has not declared k as
1480 // an inner klass
1481 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1482
1483 result->obj_at_put(members, inner_klass->java_mirror());
1484 members++;
1485 }
1486 }
1487 }
1488 }
1489
1490 if (members != length) {
1491 // Return array of right length
1492 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1493 for(int i = 0; i < members; i++) {
1494 res->obj_at_put(i, result->obj_at(i));
1495 }
1496 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1497 }
1498
1499 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1500 JVM_END
1501
1502
1503 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1504 {
1505 // ofClass is a reference to a java_lang_Class object.
1506 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1507 if (java_lang_Class::is_primitive(ofMirror)) {
1508 return nullptr;
1509 }
1510 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1511 if (!klass->is_instance_klass()) {
1512 return nullptr;
1513 }
1514
1515 bool inner_is_member = false;
1516 Klass* outer_klass
1517 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1518 if (outer_klass == nullptr) return nullptr; // already a top-level class
1519 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1520 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1521 }
1522 JVM_END
1523
1524 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1525 {
1526 oop mirror = JNIHandles::resolve_non_null(cls);
1527 if (java_lang_Class::is_primitive(mirror)) {
1528 return nullptr;
1529 }
1530 Klass* klass = java_lang_Class::as_Klass(mirror);
1531 if (!klass->is_instance_klass()) {
1532 return nullptr;
1533 }
1534 InstanceKlass* k = InstanceKlass::cast(klass);
1535 int ooff = 0, noff = 0;
1536 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1537 if (noff != 0) {
1538 constantPoolHandle i_cp(thread, k->constants());
1539 Symbol* name = i_cp->symbol_at(noff);
1540 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1541 return (jstring) JNIHandles::make_local(THREAD, str());
1542 }
1543 }
1544 return nullptr;
1545 }
1546 JVM_END
1547
1548 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1549 assert (cls != nullptr, "illegal class");
1550 JvmtiVMObjectAllocEventCollector oam;
1551 ResourceMark rm(THREAD);
1552 oop mirror = JNIHandles::resolve_non_null(cls);
1553 // Return null for arrays and primitives
1554 if (!java_lang_Class::is_primitive(mirror)) {
1555 Klass* k = java_lang_Class::as_Klass(mirror);
1556 if (k->is_instance_klass()) {
1557 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1558 if (sym == nullptr) return nullptr;
1559 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1560 return (jstring) JNIHandles::make_local(THREAD, str());
1561 }
1562 }
1563 return nullptr;
1564 JVM_END
1565
1566
1567 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1568 assert (cls != nullptr, "illegal class");
1569 oop mirror = JNIHandles::resolve_non_null(cls);
1570 // Return null for arrays and primitives
1571 if (!java_lang_Class::is_primitive(mirror)) {
1572 Klass* k = java_lang_Class::as_Klass(mirror);
1573 if (k->is_instance_klass()) {
1574 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1575 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1576 }
1577 }
1578 return nullptr;
1579 JVM_END
1580
1581
1582 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1583 // some of this code was adapted from from jni_FromReflectedField
1584
1585 oop reflected = JNIHandles::resolve_non_null(field);
1586 oop mirror = java_lang_reflect_Field::clazz(reflected);
1587 Klass* k = java_lang_Class::as_Klass(mirror);
1588 int slot = java_lang_reflect_Field::slot(reflected);
1589 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1590
1591 InstanceKlass* ik = InstanceKlass::cast(k);
1592 intptr_t offset = ik->field_offset(slot);
1593
1594 if (modifiers & JVM_ACC_STATIC) {
1595 // for static fields we only look in the current class
1596 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1597 assert(false, "cannot find static field");
1598 return false;
1599 }
1600 } else {
1601 // for instance fields we start with the current class and work
1602 // our way up through the superclass chain
1603 if (!ik->find_field_from_offset(offset, false, &fd)) {
1604 assert(false, "cannot find instance field");
1605 return false;
1606 }
1607 }
1608 return true;
1609 }
1610
1611 static Method* jvm_get_method_common(jobject method) {
1612 // some of this code was adapted from from jni_FromReflectedMethod
1613
1614 oop reflected = JNIHandles::resolve_non_null(method);
1615 oop mirror = nullptr;
1616 int slot = 0;
1617
1618 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1619 mirror = java_lang_reflect_Constructor::clazz(reflected);
1620 slot = java_lang_reflect_Constructor::slot(reflected);
1621 } else {
1622 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1623 "wrong type");
1624 mirror = java_lang_reflect_Method::clazz(reflected);
1625 slot = java_lang_reflect_Method::slot(reflected);
1626 }
1627 Klass* k = java_lang_Class::as_Klass(mirror);
1628
1629 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1630 assert(m != nullptr, "cannot find method");
1631 return m; // caller has to deal with null in product mode
1632 }
1633
1634 /* Type use annotations support (JDK 1.8) */
1635
1636 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1637 assert (cls != nullptr, "illegal class");
1638 ResourceMark rm(THREAD);
1639 // Return null for arrays and primitives
1640 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1642 if (k->is_instance_klass()) {
1643 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1644 if (type_annotations != nullptr) {
1645 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1646 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1647 }
1648 }
1649 }
1650 return nullptr;
1651 JVM_END
1652
1653 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1654 assert (method != nullptr, "illegal method");
1655 // method is a handle to a java.lang.reflect.Method object
1656 Method* m = jvm_get_method_common(method);
1657 if (m == nullptr) {
1658 return nullptr;
1659 }
1660
1661 AnnotationArray* type_annotations = m->type_annotations();
1662 if (type_annotations != nullptr) {
1663 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1664 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1665 }
1666
1667 return nullptr;
1668 JVM_END
1669
1670 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1671 assert (field != nullptr, "illegal field");
1672 fieldDescriptor fd;
1673 bool gotFd = jvm_get_field_common(field, fd);
1674 if (!gotFd) {
1675 return nullptr;
1676 }
1677
1678 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1679 JVM_END
1680
1681 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1682 if (!cp->is_within_bounds(index)) {
1683 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1684 }
1685 }
1686
1687 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1688 {
1689 // method is a handle to a java.lang.reflect.Method object
1690 Method* method_ptr = jvm_get_method_common(method);
1691 methodHandle mh (THREAD, method_ptr);
1692 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1693 const int num_params = mh->method_parameters_length();
1694
1695 if (num_params < 0) {
1696 // A -1 return value from method_parameters_length means there is no
1697 // parameter data. Return null to indicate this to the reflection
1698 // API.
1699 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1700 return (jobjectArray)nullptr;
1701 } else {
1702 // Otherwise, we return something up to reflection, even if it is
1703 // a zero-length array. Why? Because in some cases this can
1704 // trigger a MalformedParametersException.
1705
1706 // make sure all the symbols are properly formatted
1707 for (int i = 0; i < num_params; i++) {
1708 MethodParametersElement* params = mh->method_parameters_start();
1709 int index = params[i].name_cp_index;
1710 constantPoolHandle cp(THREAD, mh->constants());
1711 bounds_check(cp, index, CHECK_NULL);
1712
1713 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1714 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1715 "Wrong type at constant pool index");
1716 }
1717
1718 }
1719
1720 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1721 objArrayHandle result (THREAD, result_oop);
1722
1723 for (int i = 0; i < num_params; i++) {
1724 MethodParametersElement* params = mh->method_parameters_start();
1725 // For a 0 index, give a null symbol
1726 Symbol* sym = 0 != params[i].name_cp_index ?
1727 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1728 int flags = params[i].flags;
1729 oop param = Reflection::new_parameter(reflected_method, i, sym,
1730 flags, CHECK_NULL);
1731 result->obj_at_put(i, param);
1732 }
1733 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1734 }
1735 }
1736 JVM_END
1737
1738 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1739
1740 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1741 {
1742 JvmtiVMObjectAllocEventCollector oam;
1743
1744 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1745 // Exclude primitive types and array types
1746 if (java_lang_Class::is_primitive(ofMirror) ||
1747 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1748 // Return empty array
1749 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1750 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1751 }
1752
1753 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1754 constantPoolHandle cp(THREAD, k->constants());
1755
1756 // Ensure class is linked
1757 k->link_class(CHECK_NULL);
1758
1759 // Allocate result
1760 int num_fields;
1761
1762 if (publicOnly) {
1763 num_fields = 0;
1764 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1765 if (fs.access_flags().is_public()) ++num_fields;
1766 }
1767 } else {
1768 num_fields = k->java_fields_count();
1769 }
1770
1771 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1772 objArrayHandle result (THREAD, r);
1773
1774 int out_idx = 0;
1775 fieldDescriptor fd;
1776 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1777 if (!publicOnly || fs.access_flags().is_public()) {
1778 fd.reinitialize(k, fs.index());
1779 oop field = Reflection::new_field(&fd, CHECK_NULL);
1780 result->obj_at_put(out_idx, field);
1781 ++out_idx;
1782 }
1783 }
1784 assert(out_idx == num_fields, "just checking");
1785 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1786 }
1787 JVM_END
1788
1789 // A class is a record if and only if it is final and a direct subclass of
1790 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1791 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1792 {
1793 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1794 if (k != nullptr && k->is_instance_klass()) {
1795 InstanceKlass* ik = InstanceKlass::cast(k);
1796 return ik->is_record();
1797 } else {
1798 return false;
1799 }
1800 }
1801 JVM_END
1802
1803 // Returns an array containing the components of the Record attribute,
1804 // or null if the attribute is not present.
1805 //
1806 // Note that this function returns the components of the Record attribute
1807 // even if the class is not a record.
1808 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1809 {
1810 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1811 assert(c->is_instance_klass(), "must be");
1812 InstanceKlass* ik = InstanceKlass::cast(c);
1813
1814 Array<RecordComponent*>* components = ik->record_components();
1815 if (components != nullptr) {
1816 JvmtiVMObjectAllocEventCollector oam;
1817 constantPoolHandle cp(THREAD, ik->constants());
1818 int length = components->length();
1819 assert(length >= 0, "unexpected record_components length");
1820 objArrayOop record_components =
1821 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1822 objArrayHandle components_h (THREAD, record_components);
1823
1824 for (int x = 0; x < length; x++) {
1825 RecordComponent* component = components->at(x);
1826 assert(component != nullptr, "unexpected null record component");
1827 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1828 components_h->obj_at_put(x, component_oop);
1829 }
1830 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1831 }
1832
1833 return nullptr;
1834 }
1835 JVM_END
1836
1837 static bool select_method(const methodHandle& method, bool want_constructor) {
1838 if (want_constructor) {
1839 return (method->is_initializer() && !method->is_static());
1840 } else {
1841 return (!method->is_initializer() && !method->is_overpass());
1842 }
1843 }
1844
1845 static jobjectArray get_class_declared_methods_helper(
1846 JNIEnv *env,
1847 jclass ofClass, jboolean publicOnly,
1848 bool want_constructor,
1849 Klass* klass, TRAPS) {
1850
1851 JvmtiVMObjectAllocEventCollector oam;
1852
1853 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1854 // Exclude primitive types and array types
1855 if (java_lang_Class::is_primitive(ofMirror)
1856 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1857 // Return empty array
1858 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1859 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1860 }
1861
1862 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1863
1864 // Ensure class is linked
1865 k->link_class(CHECK_NULL);
1866
1867 Array<Method*>* methods = k->methods();
1868 int methods_length = methods->length();
1869
1870 // Save original method_idnum in case of redefinition, which can change
1871 // the idnum of obsolete methods. The new method will have the same idnum
1872 // but if we refresh the methods array, the counts will be wrong.
1873 ResourceMark rm(THREAD);
1874 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1875 int num_methods = 0;
1876
1877 for (int i = 0; i < methods_length; i++) {
1878 methodHandle method(THREAD, methods->at(i));
1879 if (select_method(method, want_constructor)) {
1880 if (!publicOnly || method->is_public()) {
1881 idnums->push(method->method_idnum());
1882 ++num_methods;
1883 }
1884 }
1885 }
1886
1887 // Allocate result
1888 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1889 objArrayHandle result (THREAD, r);
1890
1891 // Now just put the methods that we selected above, but go by their idnum
1892 // in case of redefinition. The methods can be redefined at any safepoint,
1893 // so above when allocating the oop array and below when creating reflect
1894 // objects.
1895 for (int i = 0; i < num_methods; i++) {
1896 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1897 if (method.is_null()) {
1898 // Method may have been deleted and seems this API can handle null
1899 // Otherwise should probably put a method that throws NSME
1900 result->obj_at_put(i, nullptr);
1901 } else {
1902 oop m;
1903 if (want_constructor) {
1904 m = Reflection::new_constructor(method, CHECK_NULL);
1905 } else {
1906 m = Reflection::new_method(method, false, CHECK_NULL);
1907 }
1908 result->obj_at_put(i, m);
1909 }
1910 }
1911
1912 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1913 }
1914
1915 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1916 {
1917 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1918 /*want_constructor*/ false,
1919 vmClasses::reflect_Method_klass(), THREAD);
1920 }
1921 JVM_END
1922
1923 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1924 {
1925 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1926 /*want_constructor*/ true,
1927 vmClasses::reflect_Constructor_klass(), THREAD);
1928 }
1929 JVM_END
1930
1931 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1932 {
1933 oop mirror = JNIHandles::resolve_non_null(cls);
1934 if (java_lang_Class::is_primitive(mirror)) {
1935 // Primitive type
1936 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1937 }
1938
1939 Klass* k = java_lang_Class::as_Klass(mirror);
1940 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1941 }
1942 JVM_END
1943
1944 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1945 {
1946 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1947 assert(c->is_instance_klass(), "must be");
1948 InstanceKlass* ck = InstanceKlass::cast(c);
1949 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1950 assert(m->is_instance_klass(), "must be");
1951 InstanceKlass* mk = InstanceKlass::cast(m);
1952 return ck->has_nestmate_access_to(mk, THREAD);
1953 }
1954 JVM_END
1955
1956 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1957 {
1958 // current is not a primitive or array class
1959 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1960 assert(c->is_instance_klass(), "must be");
1961 InstanceKlass* ck = InstanceKlass::cast(c);
1962 InstanceKlass* host = ck->nest_host(THREAD);
1963 return (jclass) (host == nullptr ? nullptr :
1964 JNIHandles::make_local(THREAD, host->java_mirror()));
1965 }
1966 JVM_END
1967
1968 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1969 {
1970 // current is not a primitive or array class
1971 ResourceMark rm(THREAD);
1972 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1973 assert(c->is_instance_klass(), "must be");
1974 InstanceKlass* ck = InstanceKlass::cast(c);
1975 InstanceKlass* host = ck->nest_host(THREAD);
1976
1977 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1978 ck->external_name(), host->external_name());
1979 {
1980 JvmtiVMObjectAllocEventCollector oam;
1981 Array<u2>* members = host->nest_members();
1982 int length = members == nullptr ? 0 : members->length();
1983
1984 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1985
1986 // nest host is first in the array so make it one bigger
1987 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1988 length + 1, CHECK_NULL);
1989 objArrayHandle result(THREAD, r);
1990 result->obj_at_put(0, host->java_mirror());
1991 if (length != 0) {
1992 int count = 0;
1993 for (int i = 0; i < length; i++) {
1994 int cp_index = members->at(i);
1995 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1996 if (HAS_PENDING_EXCEPTION) {
1997 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1998 return nullptr; // propagate VMEs
1999 }
2000 if (log_is_enabled(Trace, class, nestmates)) {
2001 stringStream ss;
2002 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2003 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2004 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2005 log_trace(class, nestmates)("%s", ss.as_string());
2006 }
2007 CLEAR_PENDING_EXCEPTION;
2008 continue;
2009 }
2010 if (k->is_instance_klass()) {
2011 InstanceKlass* ik = InstanceKlass::cast(k);
2012 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2013 if (nest_host_k == host) {
2014 result->obj_at_put(count+1, k->java_mirror());
2015 count++;
2016 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2017 } else {
2018 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2019 ik->external_name(), nest_host_k->external_name());
2020 }
2021 } else {
2022 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2023 k->external_name());
2024 }
2025 }
2026 if (count < length) {
2027 // we had invalid entries so we need to compact the array
2028 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2029 length + 1, count + 1);
2030
2031 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2032 count + 1, CHECK_NULL);
2033 objArrayHandle result2(THREAD, r2);
2034 for (int i = 0; i < count + 1; i++) {
2035 result2->obj_at_put(i, result->obj_at(i));
2036 }
2037 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2038 }
2039 }
2040 else {
2041 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2042 }
2043 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2044 }
2045 }
2046 JVM_END
2047
2048 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2049 {
2050 oop mirror = JNIHandles::resolve_non_null(current);
2051 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2052 Klass* c = java_lang_Class::as_Klass(mirror);
2053 assert(c->is_instance_klass(), "must be");
2054 InstanceKlass* ik = InstanceKlass::cast(c);
2055 ResourceMark rm(THREAD);
2056 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2057 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2058 if (ik->is_sealed()) {
2059 JvmtiVMObjectAllocEventCollector oam;
2060 Array<u2>* subclasses = ik->permitted_subclasses();
2061 int length = subclasses->length();
2062
2063 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2064
2065 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2066 length, CHECK_NULL);
2067 objArrayHandle result(THREAD, r);
2068 int count = 0;
2069 for (int i = 0; i < length; i++) {
2070 int cp_index = subclasses->at(i);
2071 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2072 if (HAS_PENDING_EXCEPTION) {
2073 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2074 return nullptr; // propagate VMEs
2075 }
2076 if (log_is_enabled(Trace, class, sealed)) {
2077 stringStream ss;
2078 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2079 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2080 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2081 log_trace(class, sealed)("%s", ss.as_string());
2082 }
2083
2084 CLEAR_PENDING_EXCEPTION;
2085 continue;
2086 }
2087 if (k->is_instance_klass()) {
2088 result->obj_at_put(count++, k->java_mirror());
2089 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2090 }
2091 }
2092 if (count < length) {
2093 // we had invalid entries so we need to compact the array
2094 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2095 count, CHECK_NULL);
2096 objArrayHandle result2(THREAD, r2);
2097 for (int i = 0; i < count; i++) {
2098 result2->obj_at_put(i, result->obj_at(i));
2099 }
2100 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2101 }
2102 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2103 } else {
2104 return nullptr;
2105 }
2106 }
2107 JVM_END
2108
2109 // Constant pool access //////////////////////////////////////////////////////////
2110
2111 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2112 {
2113 JvmtiVMObjectAllocEventCollector oam;
2114 oop mirror = JNIHandles::resolve_non_null(cls);
2115 // Return null for primitives and arrays
2116 if (!java_lang_Class::is_primitive(mirror)) {
2117 Klass* k = java_lang_Class::as_Klass(mirror);
2118 if (k->is_instance_klass()) {
2119 InstanceKlass* k_h = InstanceKlass::cast(k);
2120 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2121 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2122 return JNIHandles::make_local(THREAD, jcp());
2123 }
2124 }
2125 return nullptr;
2126 }
2127 JVM_END
2128
2129
2130 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2131 {
2132 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2133 return cp->length();
2134 }
2135 JVM_END
2136
2137
2138 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2139 {
2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141 bounds_check(cp, index, CHECK_NULL);
2142 constantTag tag = cp->tag_at(index);
2143 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145 }
2146 Klass* k = cp->klass_at(index, CHECK_NULL);
2147 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2148 }
2149 JVM_END
2150
2151 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2152 {
2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154 bounds_check(cp, index, CHECK_NULL);
2155 constantTag tag = cp->tag_at(index);
2156 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158 }
2159 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2160 if (k == nullptr) return nullptr;
2161 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2162 }
2163 JVM_END
2164
2165 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2166 constantTag tag = cp->tag_at(index);
2167 if (!tag.is_method() && !tag.is_interface_method()) {
2168 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2169 }
2170 int klass_ref = cp->uncached_klass_ref_index_at(index);
2171 Klass* k_o;
2172 if (force_resolution) {
2173 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2174 } else {
2175 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2176 if (k_o == nullptr) return nullptr;
2177 }
2178 InstanceKlass* k = InstanceKlass::cast(k_o);
2179 Symbol* name = cp->uncached_name_ref_at(index);
2180 Symbol* sig = cp->uncached_signature_ref_at(index);
2181 methodHandle m (THREAD, k->find_method(name, sig));
2182 if (m.is_null()) {
2183 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2184 }
2185 oop method;
2186 if (!m->is_initializer() || m->is_static()) {
2187 method = Reflection::new_method(m, true, CHECK_NULL);
2188 } else {
2189 method = Reflection::new_constructor(m, CHECK_NULL);
2190 }
2191 return JNIHandles::make_local(THREAD, method);
2192 }
2193
2194 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2195 {
2196 JvmtiVMObjectAllocEventCollector oam;
2197 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2198 bounds_check(cp, index, CHECK_NULL);
2199 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2200 return res;
2201 }
2202 JVM_END
2203
2204 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2205 {
2206 JvmtiVMObjectAllocEventCollector oam;
2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2208 bounds_check(cp, index, CHECK_NULL);
2209 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2210 return res;
2211 }
2212 JVM_END
2213
2214 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2215 constantTag tag = cp->tag_at(index);
2216 if (!tag.is_field()) {
2217 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2218 }
2219 int klass_ref = cp->uncached_klass_ref_index_at(index);
2220 Klass* k_o;
2221 if (force_resolution) {
2222 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2223 } else {
2224 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2225 if (k_o == nullptr) return nullptr;
2226 }
2227 InstanceKlass* k = InstanceKlass::cast(k_o);
2228 Symbol* name = cp->uncached_name_ref_at(index);
2229 Symbol* sig = cp->uncached_signature_ref_at(index);
2230 fieldDescriptor fd;
2231 Klass* target_klass = k->find_field(name, sig, &fd);
2232 if (target_klass == nullptr) {
2233 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2234 }
2235 oop field = Reflection::new_field(&fd, CHECK_NULL);
2236 return JNIHandles::make_local(THREAD, field);
2237 }
2238
2239 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2240 {
2241 JvmtiVMObjectAllocEventCollector oam;
2242 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2243 bounds_check(cp, index, CHECK_NULL);
2244 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2245 return res;
2246 }
2247 JVM_END
2248
2249 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2250 {
2251 JvmtiVMObjectAllocEventCollector oam;
2252 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2253 bounds_check(cp, index, CHECK_NULL);
2254 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2255 return res;
2256 }
2257 JVM_END
2258
2259 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2260 {
2261 JvmtiVMObjectAllocEventCollector oam;
2262 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2263 bounds_check(cp, index, CHECK_NULL);
2264 constantTag tag = cp->tag_at(index);
2265 if (!tag.is_field_or_method()) {
2266 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2267 }
2268 int klass_ref = cp->uncached_klass_ref_index_at(index);
2269 Symbol* klass_name = cp->klass_name_at(klass_ref);
2270 Symbol* member_name = cp->uncached_name_ref_at(index);
2271 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2272 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2273 objArrayHandle dest(THREAD, dest_o);
2274 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2275 dest->obj_at_put(0, str());
2276 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2277 dest->obj_at_put(1, str());
2278 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2279 dest->obj_at_put(2, str());
2280 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2281 }
2282 JVM_END
2283
2284 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2285 {
2286 JvmtiVMObjectAllocEventCollector oam;
2287 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2288 bounds_check(cp, index, CHECK_0);
2289 constantTag tag = cp->tag_at(index);
2290 if (!tag.is_field_or_method()) {
2291 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2292 }
2293 return (jint) cp->uncached_klass_ref_index_at(index);
2294 }
2295 JVM_END
2296
2297 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2298 {
2299 JvmtiVMObjectAllocEventCollector oam;
2300 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2301 bounds_check(cp, index, CHECK_0);
2302 constantTag tag = cp->tag_at(index);
2303 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2304 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2305 }
2306 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2307 }
2308 JVM_END
2309
2310 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2311 {
2312 JvmtiVMObjectAllocEventCollector oam;
2313 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2314 bounds_check(cp, index, CHECK_NULL);
2315 constantTag tag = cp->tag_at(index);
2316 if (!tag.is_name_and_type()) {
2317 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2318 }
2319 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2320 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2321 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2322 objArrayHandle dest(THREAD, dest_o);
2323 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2324 dest->obj_at_put(0, str());
2325 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2326 dest->obj_at_put(1, str());
2327 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2328 }
2329 JVM_END
2330
2331 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2332 {
2333 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2334 bounds_check(cp, index, CHECK_0);
2335 constantTag tag = cp->tag_at(index);
2336 if (!tag.is_int()) {
2337 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2338 }
2339 return cp->int_at(index);
2340 }
2341 JVM_END
2342
2343 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2344 {
2345 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2346 bounds_check(cp, index, CHECK_(0L));
2347 constantTag tag = cp->tag_at(index);
2348 if (!tag.is_long()) {
2349 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2350 }
2351 return cp->long_at(index);
2352 }
2353 JVM_END
2354
2355 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2356 {
2357 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2358 bounds_check(cp, index, CHECK_(0.0f));
2359 constantTag tag = cp->tag_at(index);
2360 if (!tag.is_float()) {
2361 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2362 }
2363 return cp->float_at(index);
2364 }
2365 JVM_END
2366
2367 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2368 {
2369 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2370 bounds_check(cp, index, CHECK_(0.0));
2371 constantTag tag = cp->tag_at(index);
2372 if (!tag.is_double()) {
2373 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2374 }
2375 return cp->double_at(index);
2376 }
2377 JVM_END
2378
2379 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2380 {
2381 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2382 bounds_check(cp, index, CHECK_NULL);
2383 constantTag tag = cp->tag_at(index);
2384 if (!tag.is_string()) {
2385 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2386 }
2387 oop str = cp->string_at(index, CHECK_NULL);
2388 return (jstring) JNIHandles::make_local(THREAD, str);
2389 }
2390 JVM_END
2391
2392 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2393 {
2394 JvmtiVMObjectAllocEventCollector oam;
2395 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2396 bounds_check(cp, index, CHECK_NULL);
2397 constantTag tag = cp->tag_at(index);
2398 if (!tag.is_symbol()) {
2399 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2400 }
2401 Symbol* sym = cp->symbol_at(index);
2402 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2403 return (jstring) JNIHandles::make_local(THREAD, str());
2404 }
2405 JVM_END
2406
2407 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2408 {
2409 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2410 bounds_check(cp, index, CHECK_0);
2411 constantTag tag = cp->tag_at(index);
2412 jbyte result = tag.value();
2413 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2414 // they are changed to the corresponding tags from the JVM spec, so that java code in
2415 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2416 if (tag.is_klass_or_reference()) {
2417 result = JVM_CONSTANT_Class;
2418 } else if (tag.is_string_index()) {
2419 result = JVM_CONSTANT_String;
2420 } else if (tag.is_method_type_in_error()) {
2421 result = JVM_CONSTANT_MethodType;
2422 } else if (tag.is_method_handle_in_error()) {
2423 result = JVM_CONSTANT_MethodHandle;
2424 } else if (tag.is_dynamic_constant_in_error()) {
2425 result = JVM_CONSTANT_Dynamic;
2426 }
2427 return result;
2428 }
2429 JVM_END
2430
2431 // Assertion support. //////////////////////////////////////////////////////////
2432
2433 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2434 assert(cls != nullptr, "bad class");
2435
2436 oop r = JNIHandles::resolve(cls);
2437 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2438 if (java_lang_Class::is_primitive(r)) return false;
2439
2440 Klass* k = java_lang_Class::as_Klass(r);
2441 assert(k->is_instance_klass(), "must be an instance klass");
2442 if (!k->is_instance_klass()) return false;
2443
2444 ResourceMark rm(THREAD);
2445 const char* name = k->name()->as_C_string();
2446 bool system_class = k->class_loader() == nullptr;
2447 return JavaAssertions::enabled(name, system_class);
2448
2449 JVM_END
2450
2451
2452 // Return a new AssertionStatusDirectives object with the fields filled in with
2453 // command-line assertion arguments (i.e., -ea, -da).
2454 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2455 JvmtiVMObjectAllocEventCollector oam;
2456 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2457 return JNIHandles::make_local(THREAD, asd);
2458 JVM_END
2459
2460 // Verification ////////////////////////////////////////////////////////////////////////////////
2461
2462 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2463
2464 // RedefineClasses support: bug 6214132 caused verification to fail.
2465 // All functions from this section should call the jvmtiThreadSate function:
2466 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2467 // The function returns a Klass* of the _scratch_class if the verifier
2468 // was invoked in the middle of the class redefinition.
2469 // Otherwise it returns its argument value which is the _the_class Klass*.
2470 // Please, refer to the description in the jvmtiThreadSate.hpp.
2471
2472 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2474 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2475 return k->name()->as_utf8();
2476 JVM_END
2477
2478
2479 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2482 // types will have length zero if this is not an InstanceKlass
2483 // (length is determined by call to JVM_GetClassCPEntriesCount)
2484 if (k->is_instance_klass()) {
2485 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2486 for (int index = cp->length() - 1; index >= 0; index--) {
2487 constantTag tag = cp->tag_at(index);
2488 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2489 }
2490 }
2491 JVM_END
2492
2493
2494 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2496 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2497 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2498 JVM_END
2499
2500
2501 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2502 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2503 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2504 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2505 JVM_END
2506
2507
2508 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2511 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2512 JVM_END
2513
2514
2515 // The following methods, used for the verifier, are never called with
2516 // array klasses, so a direct cast to InstanceKlass is safe.
2517 // Typically, these methods are called in a loop with bounds determined
2518 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2519 // zero for arrays.
2520 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2523 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2524 int length = method->checked_exceptions_length();
2525 if (length > 0) {
2526 CheckedExceptionElement* table= method->checked_exceptions_start();
2527 for (int i = 0; i < length; i++) {
2528 exceptions[i] = table[i].class_cp_index;
2529 }
2530 }
2531 JVM_END
2532
2533
2534 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2535 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2536 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2537 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2538 return method->checked_exceptions_length();
2539 JVM_END
2540
2541
2542 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2546 memcpy(code, method->code_base(), method->code_size());
2547 JVM_END
2548
2549
2550 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2552 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2553 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2554 return method->code_size();
2555 JVM_END
2556
2557
2558 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2562 ExceptionTable extable(method);
2563 entry->start_pc = extable.start_pc(entry_index);
2564 entry->end_pc = extable.end_pc(entry_index);
2565 entry->handler_pc = extable.handler_pc(entry_index);
2566 entry->catchType = extable.catch_type_index(entry_index);
2567 JVM_END
2568
2569
2570 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2574 return method->exception_table_length();
2575 JVM_END
2576
2577
2578 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2582 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2583 JVM_END
2584
2585
2586 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2587 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2588 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2589 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2590 JVM_END
2591
2592
2593 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2594 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2595 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2596 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2597 return method->max_locals();
2598 JVM_END
2599
2600
2601 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2605 return method->size_of_parameters();
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2612 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2613 return method->verifier_max_stack();
2614 JVM_END
2615
2616
2617 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2618 ResourceMark rm(THREAD);
2619 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2620 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2621 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2622 return method->name() == vmSymbols::object_initializer_name();
2623 JVM_END
2624
2625
2626 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2627 ResourceMark rm(THREAD);
2628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2629 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2630 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2631 return method->is_overpass();
2632 JVM_END
2633
2634 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2637 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2638 return method->name()->as_utf8();
2639 JVM_END
2640
2641
2642 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2643 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2644 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2645 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2646 return method->signature()->as_utf8();
2647 JVM_END
2648
2649 /**
2650 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2651 * read entries in the constant pool. Since the old verifier always
2652 * works on a copy of the code, it will not see any rewriting that
2653 * may possibly occur in the middle of verification. So it is important
2654 * that nothing it calls tries to use the cpCache instead of the raw
2655 * constant pool, so we must use cp->uncached_x methods when appropriate.
2656 */
2657 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2659 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2660 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2661 switch (cp->tag_at(cp_index).value()) {
2662 case JVM_CONSTANT_Fieldref:
2663 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2664 default:
2665 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2666 }
2667 ShouldNotReachHere();
2668 return nullptr;
2669 JVM_END
2670
2671
2672 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2673 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2674 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2675 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2676 switch (cp->tag_at(cp_index).value()) {
2677 case JVM_CONSTANT_InterfaceMethodref:
2678 case JVM_CONSTANT_Methodref:
2679 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2680 default:
2681 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2682 }
2683 ShouldNotReachHere();
2684 return nullptr;
2685 JVM_END
2686
2687
2688 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2689 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2690 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2691 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2692 switch (cp->tag_at(cp_index).value()) {
2693 case JVM_CONSTANT_InterfaceMethodref:
2694 case JVM_CONSTANT_Methodref:
2695 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2696 default:
2697 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2698 }
2699 ShouldNotReachHere();
2700 return nullptr;
2701 JVM_END
2702
2703
2704 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2706 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2707 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2708 switch (cp->tag_at(cp_index).value()) {
2709 case JVM_CONSTANT_Fieldref:
2710 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2711 default:
2712 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2713 }
2714 ShouldNotReachHere();
2715 return nullptr;
2716 JVM_END
2717
2718
2719 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2720 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2721 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2722 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2723 Symbol* classname = cp->klass_name_at(cp_index);
2724 return classname->as_utf8();
2725 JVM_END
2726
2727
2728 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2729 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2730 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2731 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2732 switch (cp->tag_at(cp_index).value()) {
2733 case JVM_CONSTANT_Fieldref: {
2734 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2735 Symbol* classname = cp->klass_name_at(class_index);
2736 return classname->as_utf8();
2737 }
2738 default:
2739 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2740 }
2741 ShouldNotReachHere();
2742 return nullptr;
2743 JVM_END
2744
2745
2746 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2747 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2748 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2749 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2750 switch (cp->tag_at(cp_index).value()) {
2751 case JVM_CONSTANT_Methodref:
2752 case JVM_CONSTANT_InterfaceMethodref: {
2753 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2754 Symbol* classname = cp->klass_name_at(class_index);
2755 return classname->as_utf8();
2756 }
2757 default:
2758 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2759 }
2760 ShouldNotReachHere();
2761 return nullptr;
2762 JVM_END
2763
2764
2765 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2766 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2767 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2768 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2769 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2770 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2771 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2772 switch (cp->tag_at(cp_index).value()) {
2773 case JVM_CONSTANT_Fieldref: {
2774 Symbol* name = cp->uncached_name_ref_at(cp_index);
2775 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2776 InstanceKlass* ik = InstanceKlass::cast(k_called);
2777 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2778 if (fs.name() == name && fs.signature() == signature) {
2779 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2780 }
2781 }
2782 return -1;
2783 }
2784 default:
2785 fatal("JVM_GetCPFieldModifiers: illegal constant");
2786 }
2787 ShouldNotReachHere();
2788 return 0;
2789 JVM_END
2790
2791
2792 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2793 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2794 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2795 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2796 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2797 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2798 switch (cp->tag_at(cp_index).value()) {
2799 case JVM_CONSTANT_Methodref:
2800 case JVM_CONSTANT_InterfaceMethodref: {
2801 Symbol* name = cp->uncached_name_ref_at(cp_index);
2802 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2803 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2804 int methods_count = methods->length();
2805 for (int i = 0; i < methods_count; i++) {
2806 Method* method = methods->at(i);
2807 if (method->name() == name && method->signature() == signature) {
2808 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2809 }
2810 }
2811 return -1;
2812 }
2813 default:
2814 fatal("JVM_GetCPMethodModifiers: illegal constant");
2815 }
2816 ShouldNotReachHere();
2817 return 0;
2818 JVM_END
2819
2820
2821 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2822
2823 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2824 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2825 JVM_END
2826
2827
2828 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2829 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2830 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2831 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2832 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2833 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2834 JVM_END
2835
2836 // Printing support //////////////////////////////////////////////////
2837 extern "C" {
2838
2839 ATTRIBUTE_PRINTF(3, 0)
2840 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2841 // Reject count values that are negative signed values converted to
2842 // unsigned; see bug 4399518, 4417214
2843 if ((intptr_t)count <= 0) return -1;
2844
2845 int result = os::vsnprintf(str, count, fmt, args);
2846 if (result > 0 && (size_t)result >= count) {
2847 result = -1;
2848 }
2849
2850 return result;
2851 }
2852
2853 ATTRIBUTE_PRINTF(3, 4)
2854 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2855 va_list args;
2856 int len;
2857 va_start(args, fmt);
2858 len = jio_vsnprintf(str, count, fmt, args);
2859 va_end(args);
2860 return len;
2861 }
2862
2863 ATTRIBUTE_PRINTF(2, 3)
2864 int jio_fprintf(FILE* f, const char *fmt, ...) {
2865 int len;
2866 va_list args;
2867 va_start(args, fmt);
2868 len = jio_vfprintf(f, fmt, args);
2869 va_end(args);
2870 return len;
2871 }
2872
2873 ATTRIBUTE_PRINTF(2, 0)
2874 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2875 if (Arguments::vfprintf_hook() != nullptr) {
2876 return Arguments::vfprintf_hook()(f, fmt, args);
2877 } else {
2878 return vfprintf(f, fmt, args);
2879 }
2880 }
2881
2882 ATTRIBUTE_PRINTF(1, 2)
2883 JNIEXPORT int jio_printf(const char *fmt, ...) {
2884 int len;
2885 va_list args;
2886 va_start(args, fmt);
2887 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2888 va_end(args);
2889 return len;
2890 }
2891
2892 // HotSpot specific jio method
2893 void jio_print(const char* s, size_t len) {
2894 // Try to make this function as atomic as possible.
2895 if (Arguments::vfprintf_hook() != nullptr) {
2896 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2897 } else {
2898 // Make an unused local variable to avoid warning from gcc compiler.
2899 ssize_t count = os::write(defaultStream::output_fd(), s, (int)len);
2900 }
2901 }
2902
2903 } // Extern C
2904
2905 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2906
2907 // In most of the JVM thread support functions we need to access the
2908 // thread through a ThreadsListHandle to prevent it from exiting and
2909 // being reclaimed while we try to operate on it. The exceptions to this
2910 // rule are when operating on the current thread, or if the monitor of
2911 // the target java.lang.Thread is locked at the Java level - in both
2912 // cases the target cannot exit.
2913
2914 static void thread_entry(JavaThread* thread, TRAPS) {
2915 HandleMark hm(THREAD);
2916 Handle obj(THREAD, thread->threadObj());
2917 JavaValue result(T_VOID);
2918 JavaCalls::call_virtual(&result,
2919 obj,
2920 vmClasses::Thread_klass(),
2921 vmSymbols::run_method_name(),
2922 vmSymbols::void_method_signature(),
2923 THREAD);
2924 }
2925
2926
2927 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2928 #if INCLUDE_CDS
2929 if (DumpSharedSpaces) {
2930 // During java -Xshare:dump, if we allow multiple Java threads to
2931 // execute in parallel, symbols and classes may be loaded in
2932 // random orders which will make the resulting CDS archive
2933 // non-deterministic.
2934 //
2935 // Lucikly, during java -Xshare:dump, it's important to run only
2936 // the code in the main Java thread (which is NOT started here) that
2937 // creates the module graph, etc. It's safe to not start the other
2938 // threads which are launched by class static initializers
2939 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2940 if (log_is_enabled(Info, cds)) {
2941 ResourceMark rm;
2942 oop t = JNIHandles::resolve_non_null(jthread);
2943 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2944 }
2945 return;
2946 }
2947 #endif
2948 JavaThread *native_thread = nullptr;
2949
2950 // We cannot hold the Threads_lock when we throw an exception,
2951 // due to rank ordering issues. Example: we might need to grab the
2952 // Heap_lock while we construct the exception.
2953 bool throw_illegal_thread_state = false;
2954
2955 // We must release the Threads_lock before we can post a jvmti event
2956 // in Thread::start.
2957 {
2958 // Ensure that the C++ Thread and OSThread structures aren't freed before
2959 // we operate.
2960 MutexLocker mu(Threads_lock);
2961
2962 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2963 // re-starting an already started thread, so we should usually find
2964 // that the JavaThread is null. However for a JNI attached thread
2965 // there is a small window between the Thread object being created
2966 // (with its JavaThread set) and the update to its threadStatus, so we
2967 // have to check for this
2968 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2969 throw_illegal_thread_state = true;
2970 } else {
2971 jlong size =
2972 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2973 // Allocate the C++ Thread structure and create the native thread. The
2974 // stack size retrieved from java is 64-bit signed, but the constructor takes
2975 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2976 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2977 // - Avoid passing negative values which would result in really large stacks.
2978 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2979 size_t sz = size > 0 ? (size_t) size : 0;
2980 native_thread = new JavaThread(&thread_entry, sz);
2981
2982 // At this point it may be possible that no osthread was created for the
2983 // JavaThread due to lack of memory. Check for this situation and throw
2984 // an exception if necessary. Eventually we may want to change this so
2985 // that we only grab the lock if the thread was created successfully -
2986 // then we can also do this check and throw the exception in the
2987 // JavaThread constructor.
2988 if (native_thread->osthread() != nullptr) {
2989 // Note: the current thread is not being used within "prepare".
2990 native_thread->prepare(jthread);
2991 }
2992 }
2993 }
2994
2995 if (throw_illegal_thread_state) {
2996 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2997 }
2998
2999 assert(native_thread != nullptr, "Starting null thread?");
3000
3001 if (native_thread->osthread() == nullptr) {
3002 ResourceMark rm(thread);
3003 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3004 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3005 // No one should hold a reference to the 'native_thread'.
3006 native_thread->smr_delete();
3007 if (JvmtiExport::should_post_resource_exhausted()) {
3008 JvmtiExport::post_resource_exhausted(
3009 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3010 os::native_thread_creation_failed_msg());
3011 }
3012 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3013 os::native_thread_creation_failed_msg());
3014 }
3015
3016 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3017
3018 Thread::start(native_thread);
3019
3020 JVM_END
3021
3022
3023 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3024 ThreadsListHandle tlh(thread);
3025 oop java_thread = nullptr;
3026 JavaThread* receiver = nullptr;
3027 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3028 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3029
3030 if (is_alive) {
3031 // jthread refers to a live JavaThread.
3032 Thread::set_priority(receiver, (ThreadPriority)prio);
3033 }
3034 // Implied else: If the JavaThread hasn't started yet, then the
3035 // priority set in the java.lang.Thread object above will be pushed
3036 // down when it does start.
3037 JVM_END
3038
3039
3040 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3041 if (os::dont_yield()) return;
3042 HOTSPOT_THREAD_YIELD();
3043 os::naked_yield();
3044 JVM_END
3045
3046 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3047 if (millis < 0) {
3048 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3049 }
3050
3051 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3052 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3053 }
3054
3055 // Save current thread state and restore it at the end of this block.
3056 // And set new thread state to SLEEPING.
3057 JavaThreadSleepState jtss(thread);
3058
3059 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3060
3061 if (millis == 0) {
3062 os::naked_yield();
3063 } else {
3064 ThreadState old_state = thread->osthread()->get_state();
3065 thread->osthread()->set_state(SLEEPING);
3066 if (!thread->sleep(millis)) { // interrupted
3067 // An asynchronous exception could have been thrown on
3068 // us while we were sleeping. We do not overwrite those.
3069 if (!HAS_PENDING_EXCEPTION) {
3070 HOTSPOT_THREAD_SLEEP_END(1);
3071
3072 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3073 // to properly restore the thread state. That's likely wrong.
3074 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3075 }
3076 }
3077 thread->osthread()->set_state(old_state);
3078 }
3079 HOTSPOT_THREAD_SLEEP_END(0);
3080 JVM_END
3081
3082 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3083 oop jthread = thread->threadObj();
3084 assert(jthread != nullptr, "no current carrier thread!");
3085 return JNIHandles::make_local(THREAD, jthread);
3086 JVM_END
3087
3088 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3089 oop theThread = thread->vthread();
3090 assert(theThread != (oop)nullptr, "no current thread!");
3091 return JNIHandles::make_local(THREAD, theThread);
3092 JVM_END
3093
3094 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3095 jobject theThread))
3096 oop threadObj = JNIHandles::resolve(theThread);
3097 thread->set_vthread(threadObj);
3098 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3099 JVM_END
3100
3101 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3102 return ThreadIdentifier::unsafe_offset();
3103 JVM_END
3104
3105 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3106 ThreadsListHandle tlh(thread);
3107 JavaThread* receiver = nullptr;
3108 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3109 if (is_alive) {
3110 // jthread refers to a live JavaThread.
3111 receiver->interrupt();
3112 }
3113 JVM_END
3114
3115 // Return true iff the current thread has locked the object passed in
3116
3117 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3118 if (obj == nullptr) {
3119 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3120 }
3121 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3122 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3123 JVM_END
3124
3125 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3126 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3127 return JNIHandles::make_local(THREAD, trace);
3128 JVM_END
3129
3130 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3131 VM_PrintThreads op;
3132 VMThread::execute(&op);
3133 if (JvmtiExport::should_post_data_dump()) {
3134 JvmtiExport::post_data_dump();
3135 }
3136 JVM_END
3137
3138 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3139 // We don't use a ThreadsListHandle here because the current thread
3140 // must be alive.
3141 oop java_thread = JNIHandles::resolve_non_null(jthread);
3142 JavaThread* thr = java_lang_Thread::thread(java_thread);
3143 if (thread == thr && !thr->has_attached_via_jni()) {
3144 // Thread naming is only supported for the current thread and
3145 // we don't set the name of an attached thread to avoid stepping
3146 // on other programs.
3147 ResourceMark rm(thread);
3148 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3149 os::set_native_thread_name(thread_name);
3150 }
3151 JVM_END
3152
3153 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3154 oop theCache = thread->scopedValueCache();
3155 return JNIHandles::make_local(THREAD, theCache);
3156 JVM_END
3157
3158 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3159 jobject theCache))
3160 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3161 thread->set_scopedValueCache(objs);
3162 JVM_END
3163
3164 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3165
3166 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3167 ResourceMark rm(THREAD);
3168 JvmtiVMObjectAllocEventCollector oam;
3169 vframeStream vfst(thread);
3170
3171 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3172 // This must only be called from SecurityManager.getClassContext
3173 Method* m = vfst.method();
3174 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3175 m->name() == vmSymbols::getClassContext_name() &&
3176 m->signature() == vmSymbols::void_class_array_signature())) {
3177 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3178 }
3179 }
3180
3181 // Collect method holders
3182 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3183 for (; !vfst.at_end(); vfst.security_next()) {
3184 Method* m = vfst.method();
3185 // Native frames are not returned
3186 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3187 Klass* holder = m->method_holder();
3188 assert(holder->is_klass(), "just checking");
3189 klass_array->append(holder);
3190 }
3191 }
3192
3193 // Create result array of type [Ljava/lang/Class;
3194 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3195 // Fill in mirrors corresponding to method holders
3196 for (int i = 0; i < klass_array->length(); i++) {
3197 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3198 }
3199
3200 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3201 JVM_END
3202
3203
3204 // java.lang.Package ////////////////////////////////////////////////////////////////
3205
3206
3207 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3208 ResourceMark rm(THREAD);
3209 JvmtiVMObjectAllocEventCollector oam;
3210 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3211 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3212 return (jstring) JNIHandles::make_local(THREAD, result);
3213 JVM_END
3214
3215
3216 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3217 JvmtiVMObjectAllocEventCollector oam;
3218 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3219 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3220 JVM_END
3221
3222
3223 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3224
3225
3226 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3227 MonitorLocker ml(Heap_lock);
3228 oop ref = Universe::reference_pending_list();
3229 if (ref != nullptr) {
3230 Universe::clear_reference_pending_list();
3231 }
3232 return JNIHandles::make_local(THREAD, ref);
3233 JVM_END
3234
3235 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3236 MonitorLocker ml(Heap_lock);
3237 return Universe::has_reference_pending_list();
3238 JVM_END
3239
3240 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3241 MonitorLocker ml(Heap_lock);
3242 while (!Universe::has_reference_pending_list()) {
3243 ml.wait();
3244 }
3245 JVM_END
3246
3247 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3248 oop ref_oop = JNIHandles::resolve_non_null(ref);
3249 // PhantomReference has it's own implementation of refersTo().
3250 // See: JVM_PhantomReferenceRefersTo
3251 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3252 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3253 return referent == JNIHandles::resolve(o);
3254 JVM_END
3255
3256 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3257 oop ref_oop = JNIHandles::resolve_non_null(ref);
3258 // FinalReference has it's own implementation of clear().
3259 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3260 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3261 // If the referent has already been cleared then done.
3262 // However, if the referent is dead but has not yet been cleared by
3263 // concurrent reference processing, it should NOT be cleared here.
3264 // Instead, clearing should be left to the GC. Clearing it here could
3265 // detectably lose an expected notification, which is impossible with
3266 // STW reference processing. The clearing in enqueue() doesn't have
3267 // this problem, since the enqueue covers the notification, but it's not
3268 // worth the effort to handle that case specially.
3269 return;
3270 }
3271 java_lang_ref_Reference::clear_referent(ref_oop);
3272 JVM_END
3273
3274
3275 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3276
3277
3278 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3279 oop ref_oop = JNIHandles::resolve_non_null(ref);
3280 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3281 return referent == JNIHandles::resolve(o);
3282 JVM_END
3283
3284
3285 // ObjectInputStream ///////////////////////////////////////////////////////////////
3286
3287 // Return the first user-defined class loader up the execution stack, or null
3288 // if only code from the bootstrap or platform class loader is on the stack.
3289
3290 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3291 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3292 InstanceKlass* ik = vfst.method()->method_holder();
3293 oop loader = ik->class_loader();
3294 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3295 // Skip reflection related frames
3296 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3297 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3298 return JNIHandles::make_local(THREAD, loader);
3299 }
3300 }
3301 }
3302 return nullptr;
3303 JVM_END
3304
3305
3306 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3307
3308
3309 // resolve array handle and check arguments
3310 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3311 if (arr == nullptr) {
3312 THROW_0(vmSymbols::java_lang_NullPointerException());
3313 }
3314 oop a = JNIHandles::resolve_non_null(arr);
3315 if (!a->is_array()) {
3316 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3317 } else if (type_array_only && !a->is_typeArray()) {
3318 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3319 }
3320 return arrayOop(a);
3321 }
3322
3323
3324 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3325 arrayOop a = check_array(env, arr, false, CHECK_0);
3326 return a->length();
3327 JVM_END
3328
3329
3330 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3331 JvmtiVMObjectAllocEventCollector oam;
3332 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3333 jvalue value;
3334 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3335 oop box = Reflection::box(&value, type, CHECK_NULL);
3336 return JNIHandles::make_local(THREAD, box);
3337 JVM_END
3338
3339
3340 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3341 jvalue value;
3342 value.i = 0; // to initialize value before getting used in CHECK
3343 arrayOop a = check_array(env, arr, true, CHECK_(value));
3344 assert(a->is_typeArray(), "just checking");
3345 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3346 BasicType wide_type = (BasicType) wCode;
3347 if (type != wide_type) {
3348 Reflection::widen(&value, type, wide_type, CHECK_(value));
3349 }
3350 return value;
3351 JVM_END
3352
3353
3354 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3355 arrayOop a = check_array(env, arr, false, CHECK);
3356 oop box = JNIHandles::resolve(val);
3357 jvalue value;
3358 value.i = 0; // to initialize value before getting used in CHECK
3359 BasicType value_type;
3360 if (a->is_objArray()) {
3361 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3362 value_type = Reflection::unbox_for_regular_object(box, &value);
3363 } else {
3364 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3365 }
3366 Reflection::array_set(&value, a, index, value_type, CHECK);
3367 JVM_END
3368
3369
3370 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3371 arrayOop a = check_array(env, arr, true, CHECK);
3372 assert(a->is_typeArray(), "just checking");
3373 BasicType value_type = (BasicType) vCode;
3374 Reflection::array_set(&v, a, index, value_type, CHECK);
3375 JVM_END
3376
3377
3378 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3379 JvmtiVMObjectAllocEventCollector oam;
3380 oop element_mirror = JNIHandles::resolve(eltClass);
3381 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3382 return JNIHandles::make_local(THREAD, result);
3383 JVM_END
3384
3385
3386 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3387 JvmtiVMObjectAllocEventCollector oam;
3388 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3389 oop element_mirror = JNIHandles::resolve(eltClass);
3390 assert(dim_array->is_typeArray(), "just checking");
3391 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3392 return JNIHandles::make_local(THREAD, result);
3393 JVM_END
3394
3395
3396 // Library support ///////////////////////////////////////////////////////////////////////////
3397
3398 JVM_LEAF(void*, JVM_LoadZipLibrary())
3399 ClassLoader::load_zip_library_if_needed();
3400 return ClassLoader::zip_library_handle();
3401 JVM_END
3402
3403 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3404 //%note jvm_ct
3405 char ebuf[1024];
3406 void *load_result;
3407 {
3408 ThreadToNativeFromVM ttnfvm(thread);
3409 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3410 }
3411 if (load_result == nullptr) {
3412 if (throwException) {
3413 char msg[1024];
3414 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3415 // Since 'ebuf' may contain a string encoded using
3416 // platform encoding scheme, we need to pass
3417 // Exceptions::unsafe_to_utf8 to the new_exception method
3418 // as the last argument. See bug 6367357.
3419 Handle h_exception =
3420 Exceptions::new_exception(thread,
3421 vmSymbols::java_lang_UnsatisfiedLinkError(),
3422 msg, Exceptions::unsafe_to_utf8);
3423
3424 THROW_HANDLE_0(h_exception);
3425 } else {
3426 log_info(library)("Failed to load library %s", name);
3427 return load_result;
3428 }
3429 }
3430 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3431 return load_result;
3432 JVM_END
3433
3434
3435 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3436 os::dll_unload(handle);
3437 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3438 JVM_END
3439
3440
3441 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3442 void* find_result = os::dll_lookup(handle, name);
3443 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3444 find_result != nullptr ? "Found" : "Failed to find",
3445 name, p2i(handle));
3446 return find_result;
3447 JVM_END
3448
3449
3450 // JNI version ///////////////////////////////////////////////////////////////////////////////
3451
3452 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3453 return Threads::is_supported_jni_version_including_1_1(version);
3454 JVM_END
3455
3456
3457 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3458 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3459 JVM_END
3460
3461 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3462 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3463 JVM_END
3464
3465 // String support ///////////////////////////////////////////////////////////////////////////
3466
3467 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3468 JvmtiVMObjectAllocEventCollector oam;
3469 if (str == nullptr) return nullptr;
3470 oop string = JNIHandles::resolve_non_null(str);
3471 oop result = StringTable::intern(string, CHECK_NULL);
3472 return (jstring) JNIHandles::make_local(THREAD, result);
3473 JVM_END
3474
3475
3476 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3477
3478 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3479 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3480 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3481 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3482 // nature. JavaThreads will be "in native" when using this API from JDK code.
3483
3484
3485 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3486 VM_Exit::block_if_vm_exited();
3487 return new PlatformMutex();
3488 }
3489
3490
3491 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3492 VM_Exit::block_if_vm_exited();
3493 delete ((PlatformMutex*) mon);
3494 }
3495
3496
3497 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3498 VM_Exit::block_if_vm_exited();
3499 ((PlatformMutex*) mon)->lock();
3500 return 0;
3501 }
3502
3503
3504 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3505 VM_Exit::block_if_vm_exited();
3506 ((PlatformMutex*) mon)->unlock();
3507 }
3508
3509
3510 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3511
3512 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3513 Handle loader, Handle protection_domain,
3514 jboolean throwError, TRAPS) {
3515 // Security Note:
3516 // The Java level wrapper will perform the necessary security check allowing
3517 // us to pass the null as the initiating class loader. The VM is responsible for
3518 // the checkPackageAccess relative to the initiating class loader via the
3519 // protection_domain. The protection_domain is passed as null by the java code
3520 // if there is no security manager in 3-arg Class.forName().
3521 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3522
3523 // Check if we should initialize the class
3524 if (init && klass->is_instance_klass()) {
3525 klass->initialize(CHECK_NULL);
3526 }
3527 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3528 }
3529
3530
3531 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3532
3533 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3534 Handle method_handle;
3535 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3536 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3537 Handle receiver(THREAD, JNIHandles::resolve(obj));
3538 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3539 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3540 jobject res = JNIHandles::make_local(THREAD, result);
3541 if (JvmtiExport::should_post_vm_object_alloc()) {
3542 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3543 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3544 if (java_lang_Class::is_primitive(ret_type)) {
3545 // Only for primitive type vm allocates memory for java object.
3546 // See box() method.
3547 JvmtiExport::post_vm_object_alloc(thread, result);
3548 }
3549 }
3550 return res;
3551 } else {
3552 THROW_0(vmSymbols::java_lang_StackOverflowError());
3553 }
3554 JVM_END
3555
3556
3557 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3558 oop constructor_mirror = JNIHandles::resolve(c);
3559 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3560 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3561 jobject res = JNIHandles::make_local(THREAD, result);
3562 if (JvmtiExport::should_post_vm_object_alloc()) {
3563 JvmtiExport::post_vm_object_alloc(thread, result);
3564 }
3565 return res;
3566 JVM_END
3567
3568 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3569
3570 JVM_LEAF(jboolean, JVM_SupportsCX8())
3571 return VM_Version::supports_cx8();
3572 JVM_END
3573
3574 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3576 assert(k->is_klass(), "just checking");
3577 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3578 JVM_END
3579
3580 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3581 jclass caller,
3582 jstring interfaceMethodName,
3583 jobject factoryType,
3584 jobject interfaceMethodType,
3585 jobject implementationMember,
3586 jobject dynamicMethodType,
3587 jclass lambdaProxyClass))
3588 #if INCLUDE_CDS
3589 if (!Arguments::is_dumping_archive()) {
3590 return;
3591 }
3592
3593 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3594 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3595 if (caller_ik->is_hidden()) {
3596 // Hidden classes not of type lambda proxy classes are currently not being archived.
3597 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3598 // registered for archiving.
3599 return;
3600 }
3601 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3602 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3603 assert(lambda_ik->is_hidden(), "must be a hidden class");
3604 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3605
3606 Symbol* interface_method_name = nullptr;
3607 if (interfaceMethodName != nullptr) {
3608 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3609 }
3610 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3611 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3612
3613 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3614 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3615
3616 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3617 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3618 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3619
3620 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3621 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3622
3623 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3624 interface_method_type, m, dynamic_method_type, THREAD);
3625 #endif // INCLUDE_CDS
3626 JVM_END
3627
3628 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3629 jclass caller,
3630 jstring interfaceMethodName,
3631 jobject factoryType,
3632 jobject interfaceMethodType,
3633 jobject implementationMember,
3634 jobject dynamicMethodType))
3635 #if INCLUDE_CDS
3636
3637 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3638 implementationMember == nullptr || dynamicMethodType == nullptr) {
3639 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3640 }
3641
3642 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3643 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3644 if (!caller_ik->is_shared()) {
3645 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3646 return nullptr;
3647 }
3648
3649 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3650 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3651 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3652
3653 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3654 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3655
3656 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3657 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3658 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3659
3660 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3661 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3662
3663 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3664 interface_method_type, m, dynamic_method_type);
3665 jclass jcls = nullptr;
3666 if (lambda_ik != nullptr) {
3667 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3668 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3669 }
3670 return jcls;
3671 #else
3672 return nullptr;
3673 #endif // INCLUDE_CDS
3674 JVM_END
3675
3676 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3677 return Arguments::is_dumping_archive();
3678 JVM_END
3679
3680 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3681 return UseSharedSpaces;
3682 JVM_END
3683
3684 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3685 if (DumpSharedSpaces) {
3686 const char* release = VM_Version::vm_release();
3687 const char* dbg_level = VM_Version::jdk_debug_level();
3688 const char* version = VM_Version::internal_vm_info_string();
3689 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3690 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3691 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3692 seed += (jlong)VM_Version::vm_major_version();
3693 seed += (jlong)VM_Version::vm_minor_version();
3694 seed += (jlong)VM_Version::vm_security_version();
3695 seed += (jlong)VM_Version::vm_patch_version();
3696 if (seed == 0) { // don't let this ever be zero.
3697 seed = 0x87654321;
3698 }
3699 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3700 return seed;
3701 } else {
3702 return 0;
3703 }
3704 JVM_END
3705
3706 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3707 #if INCLUDE_CDS
3708 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3709 #else
3710 return false;
3711 #endif // INCLUDE_CDS
3712 JVM_END
3713
3714 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3715 #if INCLUDE_CDS
3716 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3717 if (line != nullptr) {
3718 ResourceMark rm(THREAD);
3719 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3720 char* c_line = java_lang_String::as_utf8_string(h_line());
3721 if (DynamicDumpSharedSpaces) {
3722 // Note: LambdaFormInvokers::append take same format which is not
3723 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3724 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3725 }
3726 if (ClassListWriter::is_enabled()) {
3727 ClassListWriter w;
3728 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3729 }
3730 }
3731 #endif // INCLUDE_CDS
3732 JVM_END
3733
3734 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3735 #if INCLUDE_CDS
3736 ResourceMark rm(THREAD);
3737 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3738 char* file_name = java_lang_String::as_utf8_string(file_handle());
3739 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3740 #endif // INCLUDE_CDS
3741 JVM_END
3742
3743 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3744 #if INCLUDE_CDS
3745 ResourceMark rm(THREAD);
3746 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3747 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3748 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3749 #endif // INCLUDE_CDS
3750 JVM_END
3751
3752 // Returns an array of all live Thread objects (VM internal JavaThreads,
3753 // jvmti agent threads, and JNI attaching threads are skipped)
3754 // See CR 6404306 regarding JNI attaching threads
3755 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3756 ResourceMark rm(THREAD);
3757 ThreadsListEnumerator tle(THREAD, false, false);
3758 JvmtiVMObjectAllocEventCollector oam;
3759
3760 int num_threads = tle.num_threads();
3761 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3762 objArrayHandle threads_ah(THREAD, r);
3763
3764 for (int i = 0; i < num_threads; i++) {
3765 Handle h = tle.get_threadObj(i);
3766 threads_ah->obj_at_put(i, h());
3767 }
3768
3769 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3770 JVM_END
3771
3772
3773 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3774 // Return StackTraceElement[][], each element is the stack trace of a thread in
3775 // the corresponding entry in the given threads array
3776 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3777 JvmtiVMObjectAllocEventCollector oam;
3778
3779 // Check if threads is null
3780 if (threads == nullptr) {
3781 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3782 }
3783
3784 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3785 objArrayHandle ah(THREAD, a);
3786 int num_threads = ah->length();
3787 // check if threads is non-empty array
3788 if (num_threads == 0) {
3789 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3790 }
3791
3792 // check if threads is not an array of objects of Thread class
3793 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3794 if (k != vmClasses::Thread_klass()) {
3795 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3796 }
3797
3798 ResourceMark rm(THREAD);
3799
3800 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3801 for (int i = 0; i < num_threads; i++) {
3802 oop thread_obj = ah->obj_at(i);
3803 instanceHandle h(THREAD, (instanceOop) thread_obj);
3804 thread_handle_array->append(h);
3805 }
3806
3807 // The JavaThread references in thread_handle_array are validated
3808 // in VM_ThreadDump::doit().
3809 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3810 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3811
3812 JVM_END
3813
3814 // JVM monitoring and management support
3815 JVM_LEAF(void*, JVM_GetManagement(jint version))
3816 return Management::get_jmm_interface(version);
3817 JVM_END
3818
3819 // com.sun.tools.attach.VirtualMachine agent properties support
3820 //
3821 // Initialize the agent properties with the properties maintained in the VM
3822 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3823 ResourceMark rm;
3824
3825 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3826
3827 PUTPROP(props, "sun.java.command", Arguments::java_command());
3828 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3829 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3830 return properties;
3831 JVM_END
3832
3833 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3834 {
3835 JvmtiVMObjectAllocEventCollector oam;
3836
3837 if (ofClass == nullptr) {
3838 return nullptr;
3839 }
3840 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3841 // Special handling for primitive objects
3842 if (java_lang_Class::is_primitive(mirror())) {
3843 return nullptr;
3844 }
3845 Klass* k = java_lang_Class::as_Klass(mirror());
3846 if (!k->is_instance_klass()) {
3847 return nullptr;
3848 }
3849 InstanceKlass* ik = InstanceKlass::cast(k);
3850 int encl_method_class_idx = ik->enclosing_method_class_index();
3851 if (encl_method_class_idx == 0) {
3852 return nullptr;
3853 }
3854 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3855 objArrayHandle dest(THREAD, dest_o);
3856 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3857 dest->obj_at_put(0, enc_k->java_mirror());
3858 int encl_method_method_idx = ik->enclosing_method_method_index();
3859 if (encl_method_method_idx != 0) {
3860 Symbol* sym = ik->constants()->symbol_at(
3861 extract_low_short_from_int(
3862 ik->constants()->name_and_type_at(encl_method_method_idx)));
3863 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3864 dest->obj_at_put(1, str());
3865 sym = ik->constants()->symbol_at(
3866 extract_high_short_from_int(
3867 ik->constants()->name_and_type_at(encl_method_method_idx)));
3868 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3869 dest->obj_at_put(2, str());
3870 }
3871 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3872 }
3873 JVM_END
3874
3875 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3876 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3877 ResourceMark rm(THREAD);
3878
3879 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3880 return nullptr;
3881 }
3882
3883 char** vm_flags = Arguments::jvm_flags_array();
3884 char** vm_args = Arguments::jvm_args_array();
3885 int num_flags = Arguments::num_jvm_flags();
3886 int num_args = Arguments::num_jvm_args();
3887
3888 InstanceKlass* ik = vmClasses::String_klass();
3889 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3890 objArrayHandle result_h(THREAD, r);
3891
3892 int index = 0;
3893 for (int j = 0; j < num_flags; j++, index++) {
3894 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3895 result_h->obj_at_put(index, h());
3896 }
3897 for (int i = 0; i < num_args; i++, index++) {
3898 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3899 result_h->obj_at_put(index, h());
3900 }
3901 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3902 JVM_END
3903
3904 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3905 return os::get_signal_number(name);
3906 JVM_END
3907
3908 // If notifications are disabled then just update the VTMS transition bit and return.
3909 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3910 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide, jboolean first_mount))
3911 #if INCLUDE_JVMTI
3912 if (!DoJVMTIVirtualThreadTransitions) {
3913 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3914 return;
3915 }
3916 if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3917 thread->set_is_in_VTMS_transition(hide);
3918 oop vt = JNIHandles::resolve_external_guard(vthread);
3919 java_lang_Thread::set_is_in_VTMS_transition(vt, hide);
3920 return;
3921 }
3922 if (hide) {
3923 JvmtiVTMSTransitionDisabler::VTMS_mount_begin(vthread, first_mount);
3924 } else {
3925 JvmtiVTMSTransitionDisabler::VTMS_mount_end(vthread, first_mount);
3926 }
3927 #else
3928 fatal("Should only be called with JVMTI enabled");
3929 #endif
3930 JVM_END
3931
3932 // If notifications are disabled then just update the VTMS transition bit and return.
3933 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3934 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide, jboolean last_unmount))
3935 #if INCLUDE_JVMTI
3936 if (!DoJVMTIVirtualThreadTransitions) {
3937 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3938 return;
3939 }
3940 if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3941 thread->set_is_in_VTMS_transition(hide);
3942 oop vt = JNIHandles::resolve_external_guard(vthread);
3943 java_lang_Thread::set_is_in_VTMS_transition(vt, hide);
3944 return;
3945 }
3946 if (hide) {
3947 JvmtiVTMSTransitionDisabler::VTMS_unmount_begin(vthread, last_unmount);
3948 } else {
3949 JvmtiVTMSTransitionDisabler::VTMS_unmount_end(vthread, last_unmount);
3950 }
3951 #else
3952 fatal("Should only be called with JVMTI enabled");
3953 #endif
3954 JVM_END
3955
3956 // Always update the temporary VTMS transition bit.
3957 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
3958 #if INCLUDE_JVMTI
3959 if (!DoJVMTIVirtualThreadTransitions) {
3960 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3961 return;
3962 }
3963 assert(!thread->is_in_VTMS_transition(), "sanity check");
3964 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
3965 thread->toggle_is_in_tmp_VTMS_transition();
3966 #else
3967 fatal("Should only be called with JVMTI enabled");
3968 #endif
3969 JVM_END
3970
3971 /*
3972 * Return the current class's class file version. The low order 16 bits of the
3973 * returned jint contain the class's major version. The high order 16 bits
3974 * contain the class's minor version.
3975 */
3976 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3977 oop mirror = JNIHandles::resolve_non_null(current);
3978 if (java_lang_Class::is_primitive(mirror)) {
3979 // return latest major version and minor version of 0.
3980 return JVM_CLASSFILE_MAJOR_VERSION;
3981 }
3982 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
3983
3984 Klass* c = java_lang_Class::as_Klass(mirror);
3985 assert(c->is_instance_klass(), "must be");
3986 InstanceKlass* ik = InstanceKlass::cast(c);
3987 return (ik->minor_version() << 16) | ik->major_version();
3988 JVM_END
3989
3990 /*
3991 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3992 * get the value will see a materialized value and not a scalar-replaced
3993 * null value.
3994 */
3995 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3996 JVM_EnsureMaterializedForStackWalk(env, value);
3997 JVM_END