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/flatArrayKlass.hpp"
60 #include "oops/instanceKlass.hpp"
61 #include "oops/klass.inline.hpp"
62 #include "oops/method.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "prims/foreignGlobals.hpp"
68 #include "prims/jvm_misc.hpp"
69 #include "prims/jvmtiExport.hpp"
70 #include "prims/jvmtiThreadState.inline.hpp"
71 #include "prims/stackwalk.hpp"
72 #include "runtime/arguments.hpp"
73 #include "runtime/atomic.hpp"
74 #include "runtime/continuation.hpp"
75 #include "runtime/globals_extension.hpp"
76 #include "runtime/handles.inline.hpp"
77 #include "runtime/init.hpp"
78 #include "runtime/interfaceSupport.inline.hpp"
79 #include "runtime/deoptimization.hpp"
80 #include "runtime/handshake.hpp"
81 #include "runtime/java.hpp"
82 #include "runtime/javaCalls.hpp"
83 #include "runtime/javaThread.hpp"
84 #include "runtime/jfieldIDWorkaround.hpp"
85 #include "runtime/jniHandles.inline.hpp"
86 #include "runtime/os.inline.hpp"
87 #include "runtime/osThread.hpp"
88 #include "runtime/perfData.hpp"
89 #include "runtime/reflection.hpp"
90 #include "runtime/synchronizer.hpp"
91 #include "runtime/threadIdentifier.hpp"
92 #include "runtime/threadSMR.hpp"
93 #include "runtime/vframe.inline.hpp"
94 #include "runtime/vmOperations.hpp"
95 #include "runtime/vm_version.hpp"
96 #include "services/attachListener.hpp"
97 #include "services/management.hpp"
98 #include "services/threadService.hpp"
99 #include "utilities/copy.hpp"
100 #include "utilities/defaultStream.hpp"
101 #include "utilities/dtrace.hpp"
102 #include "utilities/events.hpp"
103 #include "utilities/macros.hpp"
104 #include "utilities/utf8.hpp"
105 #if INCLUDE_CDS
106 #include "classfile/systemDictionaryShared.hpp"
107 #endif
108 #if INCLUDE_JFR
109 #include "jfr/jfr.hpp"
110 #endif
111 #if INCLUDE_MANAGEMENT
112 #include "services/finalizerService.hpp"
113 #endif
114
115 #include <errno.h>
116
117 /*
118 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
119 such ctors and calls MUST NOT come between an oop declaration/init and its
120 usage because if objects are move this may cause various memory stomps, bus
121 errors and segfaults. Here is a cookbook for causing so called "naked oop
122 failures":
123
124 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
125 // Object address to be held directly in mirror & not visible to GC
126 oop mirror = JNIHandles::resolve_non_null(ofClass);
127
128 // If this ctor can hit a safepoint, moving objects around, then
129 ComplexConstructor foo;
130
131 // Boom! mirror may point to JUNK instead of the intended object
132 (some dereference of mirror)
133
134 // Here's another call that may block for GC, making mirror stale
135 MutexLocker ml(some_lock);
136
137 // And here's an initializer that can result in a stale oop
138 // all in one step.
139 oop o = call_that_can_throw_exception(TRAPS);
140
141
142 The solution is to keep the oop declaration BELOW the ctor or function
143 call that might cause a GC, do another resolve to reassign the oop, or
144 consider use of a Handle instead of an oop so there is immunity from object
145 motion. But note that the "QUICK" entries below do not have a handlemark
146 and thus can only support use of handles passed in.
147 */
148
149 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
150 ResourceMark rm;
151 int line_number = -1;
152 const char * source_file = nullptr;
153 const char * trace = "explicit";
154 InstanceKlass* caller = nullptr;
155 JavaThread* jthread = THREAD;
156 if (jthread->has_last_Java_frame()) {
157 vframeStream vfst(jthread);
158
159 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
160 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
161 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
162 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
163 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
164
165 Method* last_caller = nullptr;
166
167 while (!vfst.at_end()) {
168 Method* m = vfst.method();
169 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
170 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
171 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
172 break;
173 }
174 last_caller = m;
175 vfst.next();
176 }
177 // if this is called from Class.forName0 and that is called from Class.forName,
178 // then print the caller of Class.forName. If this is Class.loadClass, then print
179 // that caller, otherwise keep quiet since this should be picked up elsewhere.
180 bool found_it = false;
181 if (!vfst.at_end() &&
182 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
183 vfst.method()->name() == vmSymbols::forName0_name()) {
184 vfst.next();
185 if (!vfst.at_end() &&
186 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
187 vfst.method()->name() == vmSymbols::forName_name()) {
188 vfst.next();
189 found_it = true;
190 }
191 } else if (last_caller != nullptr &&
192 last_caller->method_holder()->name() ==
193 vmSymbols::java_lang_ClassLoader() &&
194 last_caller->name() == vmSymbols::loadClass_name()) {
195 found_it = true;
196 } else if (!vfst.at_end()) {
197 if (vfst.method()->is_native()) {
198 // JNI call
199 found_it = true;
200 }
201 }
202 if (found_it && !vfst.at_end()) {
203 // found the caller
204 caller = vfst.method()->method_holder();
205 line_number = vfst.method()->line_number_from_bci(vfst.bci());
206 if (line_number == -1) {
207 // show method name if it's a native method
208 trace = vfst.method()->name_and_sig_as_C_string();
209 }
210 Symbol* s = caller->source_file_name();
211 if (s != nullptr) {
212 source_file = s->as_C_string();
213 }
214 }
215 }
216 if (caller != nullptr) {
217 if (to_class != caller) {
218 const char * from = caller->external_name();
219 const char * to = to_class->external_name();
220 // print in a single call to reduce interleaving between threads
221 if (source_file != nullptr) {
222 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
223 } else {
224 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
225 }
226 }
227 }
228 }
229
230 void trace_class_resolution(Klass* to_class) {
231 EXCEPTION_MARK;
232 trace_class_resolution_impl(to_class, THREAD);
233 if (HAS_PENDING_EXCEPTION) {
234 CLEAR_PENDING_EXCEPTION;
235 }
236 }
237
238 // java.lang.System //////////////////////////////////////////////////////////////////////
239
240
241 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
242 return os::javaTimeMillis();
243 JVM_END
244
245 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
246 return os::javaTimeNanos();
247 JVM_END
248
249 // The function below is actually exposed by jdk.internal.misc.VM and not
250 // java.lang.System, but we choose to keep it here so that it stays next
251 // to JVM_CurrentTimeMillis and JVM_NanoTime
252
253 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
254 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
255
256 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
257 jlong seconds;
258 jlong nanos;
259
260 os::javaTimeSystemUTC(seconds, nanos);
261
262 // We're going to verify that the result can fit in a long.
263 // For that we need the difference in seconds between 'seconds'
264 // and 'offset_secs' to be such that:
265 // |seconds - offset_secs| < (2^63/10^9)
266 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
267 // which makes |seconds - offset_secs| < 2^33
268 // and we will prefer +/- 2^32 as the maximum acceptable diff
269 // as 2^32 has a more natural feel than 2^33...
270 //
271 // So if |seconds - offset_secs| >= 2^32 - we return a special
272 // sentinel value (-1) which the caller should take as an
273 // exception value indicating that the offset given to us is
274 // too far from range of the current time - leading to too big
275 // a nano adjustment. The caller is expected to recover by
276 // computing a more accurate offset and calling this method
277 // again. (For the record 2^32 secs is ~136 years, so that
278 // should rarely happen)
279 //
280 jlong diff = seconds - offset_secs;
281 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
282 return -1; // sentinel value: the offset is too far off the target
283 }
284
285 // return the adjustment. If you compute a time by adding
286 // this number of nanoseconds along with the number of seconds
287 // in the offset you should get the current UTC time.
288 return (diff * (jlong)1000000000) + nanos;
289 JVM_END
290
291 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
292 jobject dst, jint dst_pos, jint length))
293 // Check if we have null pointers
294 if (src == nullptr || dst == nullptr) {
295 THROW(vmSymbols::java_lang_NullPointerException());
296 }
297 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
298 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
299 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
300 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
301 // Do copy
302 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
303 JVM_END
304
305
306 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
307 JavaValue r(T_OBJECT);
308 // public synchronized Object put(Object key, Object value);
309 HandleMark hm(THREAD);
310 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
311 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
312 JavaCalls::call_virtual(&r,
313 props,
314 vmClasses::Properties_klass(),
315 vmSymbols::put_name(),
316 vmSymbols::object_object_object_signature(),
317 key_str,
318 value_str,
319 THREAD);
320 }
321
322
323 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
324
325 /*
326 * Return all of the system properties in a Java String array with alternating
327 * names and values from the jvm SystemProperty.
328 * Which includes some internal and all commandline -D defined properties.
329 */
330 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
331 ResourceMark rm(THREAD);
332 HandleMark hm(THREAD);
333 int ndx = 0;
334 int fixedCount = 2;
335
336 SystemProperty* p = Arguments::system_properties();
337 int count = Arguments::PropertyList_count(p);
338
339 // Allocate result String array
340 InstanceKlass* ik = vmClasses::String_klass();
341 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
342 objArrayHandle result_h(THREAD, r);
343
344 while (p != nullptr) {
345 const char * key = p->key();
346 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
347 const char * value = p->value();
348 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
349 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
350 result_h->obj_at_put(ndx * 2, key_str());
351 result_h->obj_at_put(ndx * 2 + 1, value_str());
352 ndx++;
353 }
354 p = p->next();
355 }
356
357 // Convert the -XX:MaxDirectMemorySize= command line flag
358 // to the sun.nio.MaxDirectMemorySize property.
359 // Do this after setting user properties to prevent people
360 // from setting the value with a -D option, as requested.
361 // Leave empty if not supplied
362 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
363 char as_chars[256];
364 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
365 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
366 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
367 result_h->obj_at_put(ndx * 2, key_str());
368 result_h->obj_at_put(ndx * 2 + 1, value_str());
369 ndx++;
370 }
371
372 // JVM monitoring and management support
373 // Add the sun.management.compiler property for the compiler's name
374 {
375 #undef CSIZE
376 #if defined(_LP64) || defined(_WIN64)
377 #define CSIZE "64-Bit "
378 #else
379 #define CSIZE
380 #endif // 64bit
381
382 #if COMPILER1_AND_COMPILER2
383 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
384 #else
385 #if defined(COMPILER1)
386 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
387 #elif defined(COMPILER2)
388 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
389 #elif INCLUDE_JVMCI
390 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
391 #else
392 const char* compiler_name = "";
393 #endif // compilers
394 #endif // COMPILER1_AND_COMPILER2
395
396 if (*compiler_name != '\0' &&
397 (Arguments::mode() != Arguments::_int)) {
398 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
399 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
400 result_h->obj_at_put(ndx * 2, key_str());
401 result_h->obj_at_put(ndx * 2 + 1, value_str());
402 ndx++;
403 }
404 }
405
406 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
407 JVM_END
408
409
410 /*
411 * Return the temporary directory that the VM uses for the attach
412 * and perf data files.
413 *
414 * It is important that this directory is well-known and the
415 * same for all VM instances. It cannot be affected by configuration
416 * variables such as java.io.tmpdir.
417 */
418 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
419 HandleMark hm(THREAD);
420 const char* temp_dir = os::get_temp_directory();
421 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
422 return (jstring) JNIHandles::make_local(THREAD, h());
423 JVM_END
424
425
426 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
427
428 extern volatile jint vm_created;
429
430 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
431 EventShutdown event;
432 if (event.should_commit()) {
433 event.set_reason("Shutdown requested from Java");
434 event.commit();
435 }
436 JVM_END
437
438
439 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
440 before_exit(thread, true);
441 vm_exit(code);
442 JVM_END
443
444
445 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
446 if (!DisableExplicitGC) {
447 EventSystemGC event;
448 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
449 Universe::heap()->collect(GCCause::_java_lang_system_gc);
450 event.commit();
451 }
452 JVM_END
453
454
455 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
456 return Universe::heap()->millis_since_last_whole_heap_examined();
457 JVM_END
458
459
460 static inline jlong convert_size_t_to_jlong(size_t val) {
461 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
462 NOT_LP64 (return (jlong)val;)
463 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
464 }
465
466 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
467 size_t n = Universe::heap()->capacity();
468 return convert_size_t_to_jlong(n);
469 JVM_END
470
471
472 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
473 size_t n = Universe::heap()->unused();
474 return convert_size_t_to_jlong(n);
475 JVM_END
476
477
478 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
479 size_t n = Universe::heap()->max_capacity();
480 return convert_size_t_to_jlong(n);
481 JVM_END
482
483
484 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
485 return os::active_processor_count();
486 JVM_END
487
488 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
489 #ifdef LINUX
490 if (UseContainerSupport) {
491 return JNI_TRUE;
492 }
493 #endif
494 return JNI_FALSE;
495 JVM_END
496
497 // java.lang.Throwable //////////////////////////////////////////////////////
498
499 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
500 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
501 java_lang_Throwable::fill_in_stack_trace(exception);
502 JVM_END
503
504 // java.lang.NullPointerException ///////////////////////////////////////////
505
506 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
507 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
508
509 oop exc = JNIHandles::resolve_non_null(throwable);
510
511 Method* method;
512 int bci;
513 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
514 return nullptr;
515 }
516 if (method->is_native()) {
517 return nullptr;
518 }
519
520 stringStream ss;
521 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
522 if (ok) {
523 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
524 return (jstring) JNIHandles::make_local(THREAD, result);
525 } else {
526 return nullptr;
527 }
528 JVM_END
529
530 // java.lang.StackTraceElement //////////////////////////////////////////////
531
532
533 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
534 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
535 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
536 objArrayHandle stack_trace(THREAD, st);
537 // Fill in the allocated stack trace
538 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
539 JVM_END
540
541
542 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
543 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
544 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
545 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
546 JVM_END
547
548
549 // java.lang.StackWalker //////////////////////////////////////////////////////
550
551
552 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
553 jint skip_frames, jobject contScope, jobject cont,
554 jint frame_count, jint start_index, jobjectArray frames))
555 if (!thread->has_last_Java_frame()) {
556 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
557 }
558
559 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
560 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
561 Handle cont_h(THREAD, JNIHandles::resolve(cont));
562 // frames array is a Class<?>[] array when only getting caller reference,
563 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
564 // be null.
565 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
566 objArrayHandle frames_array_h(THREAD, fa);
567
568 int limit = start_index + frame_count;
569 if (frames_array_h->length() < limit) {
570 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
571 }
572
573 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
574 frame_count, start_index, frames_array_h, CHECK_NULL);
575 return JNIHandles::make_local(THREAD, result);
576 JVM_END
577
578
579 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
580 jint frame_count, jint start_index,
581 jobjectArray frames))
582 // frames array is a Class<?>[] array when only getting caller reference,
583 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
584 // be null.
585 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
586 objArrayHandle frames_array_h(THREAD, fa);
587
588 int limit = start_index+frame_count;
589 if (frames_array_h->length() < limit) {
590 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
591 }
592
593 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
594 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
595 start_index, frames_array_h, THREAD);
596 JVM_END
597
598 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
599 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
600 objArrayHandle frames_array_h(THREAD, fa);
601 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
602 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
603
604 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
605 JVM_END
606
607 // java.lang.Object ///////////////////////////////////////////////
608
609
610 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
611 // as implemented in the classic virtual machine; return 0 if object is nullptr
612 if (handle == nullptr) {
613 return 0;
614 }
615 oop obj = JNIHandles::resolve_non_null(handle);
616 if (EnableValhalla && obj->klass()->is_inline_klass()) {
617 JavaValue result(T_INT);
618 JavaCallArguments args;
619 Handle ho(THREAD, obj);
620 args.push_oop(ho);
621 methodHandle method(THREAD, Universe::value_object_hash_code_method());
622 JavaCalls::call(&result, method, &args, THREAD);
623 if (HAS_PENDING_EXCEPTION) {
624 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
625 Handle e(THREAD, PENDING_EXCEPTION);
626 CLEAR_PENDING_EXCEPTION;
627 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
628 }
629 }
630 return result.get_jint();
631 } else {
632 return ObjectSynchronizer::FastHashCode(THREAD, obj);
633 }
634 JVM_END
635
636
637 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
638 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
639 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
640 if (JvmtiExport::should_post_monitor_wait()) {
641 JvmtiExport::post_monitor_wait(thread, obj(), ms);
642
643 // The current thread already owns the monitor and it has not yet
644 // been added to the wait queue so the current thread cannot be
645 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
646 // event handler cannot accidentally consume an unpark() meant for
647 // the ParkEvent associated with this ObjectMonitor.
648 }
649 ObjectSynchronizer::wait(obj, ms, CHECK);
650 JVM_END
651
652
653 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
654 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
655 ObjectSynchronizer::notify(obj, CHECK);
656 JVM_END
657
658
659 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
660 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
661 ObjectSynchronizer::notifyall(obj, CHECK);
662 JVM_END
663
664
665 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
666 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
667 Klass* klass = obj->klass();
668 JvmtiVMObjectAllocEventCollector oam;
669
670 #ifdef ASSERT
671 // Just checking that the cloneable flag is set correct
672 if (obj->is_array()) {
673 guarantee(klass->is_cloneable(), "all arrays are cloneable");
674 } else {
675 guarantee(obj->is_instance(), "should be instanceOop");
676 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
677 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
678 }
679 #endif
680
681 // Check if class of obj supports the Cloneable interface.
682 // All arrays are considered to be cloneable (See JLS 20.1.5).
683 // All j.l.r.Reference classes are considered non-cloneable.
684 if (!klass->is_cloneable() ||
685 klass->is_inline_klass() ||
686 (klass->is_instance_klass() &&
687 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
688 ResourceMark rm(THREAD);
689 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
690 }
691
692 // Make shallow object copy
693 const size_t size = obj->size();
694 oop new_obj_oop = nullptr;
695 if (obj->is_array()) {
696 const int length = ((arrayOop)obj())->length();
697 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
698 /* do_zero */ true, CHECK_NULL);
699 } else {
700 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
701 }
702
703 HeapAccess<>::clone(obj(), new_obj_oop, size);
704
705 Handle new_obj(THREAD, new_obj_oop);
706 // Caution: this involves a java upcall, so the clone should be
707 // "gc-robust" by this stage.
708 if (klass->has_finalizer()) {
709 assert(obj->is_instance(), "should be instanceOop");
710 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
711 new_obj = Handle(THREAD, new_obj_oop);
712 }
713
714 return JNIHandles::make_local(THREAD, new_obj());
715 JVM_END
716
717 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
718
719 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
720 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
721 JVM_END
722
723 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
724 return InstanceKlass::is_finalization_enabled();
725 JVM_END
726
727 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
728
729 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
730 CONT_RegisterNativeMethods(env, cls);
731 JVM_END
732
733 // java.io.File ///////////////////////////////////////////////////////////////
734
735 JVM_LEAF(char*, JVM_NativePath(char* path))
736 return os::native_path(path);
737 JVM_END
738
739
740 // Misc. class handling ///////////////////////////////////////////////////////////
741
742
743 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
744 // Getting the class of the caller frame.
745 //
746 // The call stack at this point looks something like this:
747 //
748 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
749 // [1] [ @CallerSensitive API.method ]
750 // [.] [ (skipped intermediate frames) ]
751 // [n] [ caller ]
752 vframeStream vfst(thread);
753 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
754 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
755 Method* m = vfst.method();
756 assert(m != nullptr, "sanity");
757 switch (n) {
758 case 0:
759 // This must only be called from Reflection.getCallerClass
760 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
761 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
762 }
763 // fall-through
764 case 1:
765 // Frame 0 and 1 must be caller sensitive.
766 if (!m->caller_sensitive()) {
767 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
768 }
769 break;
770 default:
771 if (!m->is_ignored_by_security_stack_walk()) {
772 // We have reached the desired frame; return the holder class.
773 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
774 }
775 break;
776 }
777 }
778 return nullptr;
779 JVM_END
780
781
782 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
783 oop mirror = nullptr;
784 BasicType t = name2type(utf);
785 if (t != T_ILLEGAL && !is_reference_type(t)) {
786 mirror = Universe::java_mirror(t);
787 }
788 if (mirror == nullptr) {
789 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
790 } else {
791 return (jclass) JNIHandles::make_local(THREAD, mirror);
792 }
793 JVM_END
794
795
796 // Returns a class loaded by the bootstrap class loader; or null
797 // if not found. ClassNotFoundException is not thrown.
798 // FindClassFromBootLoader is exported to the launcher for windows.
799 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
800 const char* name))
801 // Java libraries should ensure that name is never null or illegal.
802 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
803 // It's impossible to create this class; the name cannot fit
804 // into the constant pool.
805 return nullptr;
806 }
807 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
808
809 TempNewSymbol h_name = SymbolTable::new_symbol(name);
810 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
811 if (k == nullptr) {
812 return nullptr;
813 }
814
815 if (log_is_enabled(Debug, class, resolve)) {
816 trace_class_resolution(k);
817 }
818 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
819 JVM_END
820
821 // Find a class with this name in this loader, using the caller's protection domain.
822 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
823 jboolean init, jobject loader,
824 jclass caller))
825 TempNewSymbol h_name =
826 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
827 CHECK_NULL);
828
829 oop loader_oop = JNIHandles::resolve(loader);
830 oop from_class = JNIHandles::resolve(caller);
831 oop protection_domain = nullptr;
832 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
833 // NPE. Put it in another way, the bootstrap class loader has all permission and
834 // thus no checkPackageAccess equivalence in the VM class loader.
835 // The caller is also passed as null by the java code if there is no security
836 // manager to avoid the performance cost of getting the calling class.
837 if (from_class != nullptr && loader_oop != nullptr) {
838 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
839 }
840
841 Handle h_loader(THREAD, loader_oop);
842 Handle h_prot(THREAD, protection_domain);
843 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
844 h_prot, false, THREAD);
845
846 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
847 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
848 }
849 return result;
850 JVM_END
851
852 // Currently only called from the old verifier.
853 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
854 jboolean init, jclass from))
855 TempNewSymbol h_name =
856 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
857 CHECK_NULL);
858 oop from_class_oop = JNIHandles::resolve(from);
859 Klass* from_class = (from_class_oop == nullptr)
860 ? (Klass*)nullptr
861 : java_lang_Class::as_Klass(from_class_oop);
862 oop class_loader = nullptr;
863 oop protection_domain = nullptr;
864 if (from_class != nullptr) {
865 class_loader = from_class->class_loader();
866 protection_domain = from_class->protection_domain();
867 }
868 Handle h_loader(THREAD, class_loader);
869 Handle h_prot (THREAD, protection_domain);
870 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
871 h_prot, true, thread);
872
873 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
874 // this function is generally only used for class loading during verification.
875 ResourceMark rm;
876 oop from_mirror = JNIHandles::resolve_non_null(from);
877 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
878 const char * from_name = from_class->external_name();
879
880 oop mirror = JNIHandles::resolve_non_null(result);
881 Klass* to_class = java_lang_Class::as_Klass(mirror);
882 const char * to = to_class->external_name();
883 log_debug(class, resolve)("%s %s (verification)", from_name, to);
884 }
885
886 return result;
887 JVM_END
888
889 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
890 static jclass jvm_define_class_common(const char *name,
891 jobject loader, const jbyte *buf,
892 jsize len, jobject pd, const char *source,
893 TRAPS) {
894 if (source == nullptr) source = "__JVM_DefineClass__";
895
896 JavaThread* jt = THREAD;
897
898 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
899 ClassLoader::perf_define_appclass_selftime(),
900 ClassLoader::perf_define_appclasses(),
901 jt->get_thread_stat()->perf_recursion_counts_addr(),
902 jt->get_thread_stat()->perf_timers_addr(),
903 PerfClassTraceTime::DEFINE_CLASS);
904
905 if (UsePerfData) {
906 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
907 }
908
909 // Class resolution will get the class name from the .class stream if the name is null.
910 TempNewSymbol class_name = name == nullptr ? nullptr :
911 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
912 CHECK_NULL);
913
914 ResourceMark rm(THREAD);
915 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
916 Handle class_loader (THREAD, JNIHandles::resolve(loader));
917 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
918 ClassLoadInfo cl_info(protection_domain);
919 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
920 class_loader,
921 cl_info,
922 CHECK_NULL);
923
924 if (log_is_enabled(Debug, class, resolve)) {
925 trace_class_resolution(k);
926 }
927
928 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
929 }
930
931 enum {
932 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
933 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
934 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
935 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
936 };
937
938 /*
939 * Define a class with the specified flags that indicates if it's a nestmate,
940 * hidden, or strongly referenced from class loader.
941 */
942 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
943 const jbyte *buf, jsize len, jobject pd,
944 jboolean init, int flags, jobject classData, TRAPS) {
945 ResourceMark rm(THREAD);
946
947 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
948 // Lookup class must be a non-null instance
949 if (lookup_k == nullptr) {
950 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
951 }
952 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
953
954 Handle class_loader (THREAD, lookup_k->class_loader());
955
956 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
957 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
958 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
959 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
960
961 InstanceKlass* host_class = nullptr;
962 if (is_nestmate) {
963 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
964 }
965
966 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
967 name,
968 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
969 is_nestmate ? host_class->external_name() : "",
970 is_hidden ? "hidden" : "not hidden",
971 is_strong ? "strong" : "weak",
972 vm_annotations ? "with vm annotations" : "without vm annotation");
973
974 if (!is_hidden) {
975 // classData is only applicable for hidden classes
976 if (classData != nullptr) {
977 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
978 }
979 if (is_nestmate) {
980 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
981 }
982 if (!is_strong) {
983 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
984 }
985 if (vm_annotations) {
986 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
987 }
988 if (flags != STRONG_LOADER_LINK) {
989 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
990 err_msg("invalid flag 0x%x", flags));
991 }
992 }
993
994 // Class resolution will get the class name from the .class stream if the name is null.
995 TempNewSymbol class_name = name == nullptr ? nullptr :
996 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
997 CHECK_NULL);
998
999 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1000 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1001 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1002
1003 InstanceKlass* ik = nullptr;
1004 if (!is_hidden) {
1005 ClassLoadInfo cl_info(protection_domain);
1006 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1007 class_loader,
1008 cl_info,
1009 CHECK_NULL);
1010
1011 if (log_is_enabled(Debug, class, resolve)) {
1012 trace_class_resolution(ik);
1013 }
1014 } else { // hidden
1015 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1016 ClassLoadInfo cl_info(protection_domain,
1017 host_class,
1018 classData_h,
1019 is_hidden,
1020 is_strong,
1021 vm_annotations);
1022 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1023 class_loader,
1024 cl_info,
1025 CHECK_NULL);
1026
1027 // The hidden class loader data has been artificially been kept alive to
1028 // this point. The mirror and any instances of this class have to keep
1029 // it alive afterwards.
1030 ik->class_loader_data()->dec_keep_alive();
1031
1032 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1033 ModuleEntry* module = ik->module();
1034 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1035 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1036 module_name,
1037 ik->external_name(),
1038 host_class->external_name(),
1039 ik->is_hidden() ? "is hidden" : "is not hidden");
1040 }
1041 }
1042
1043 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1044 // non-hidden class or nestmate class must be in the same package as the Lookup class
1045 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1046 }
1047
1048 if (init) {
1049 ik->initialize(CHECK_NULL);
1050 } else {
1051 ik->link_class(CHECK_NULL);
1052 }
1053
1054 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1055 }
1056
1057 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1058 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1059 JVM_END
1060
1061 /*
1062 * Define a class with the specified lookup class.
1063 * lookup: Lookup class
1064 * name: the name of the class
1065 * buf: class bytes
1066 * len: length of class bytes
1067 * pd: protection domain
1068 * init: initialize the class
1069 * flags: properties of the class
1070 * classData: private static pre-initialized field
1071 */
1072 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1073 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1074
1075 if (lookup == nullptr) {
1076 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1077 }
1078
1079 assert(buf != nullptr, "buf must not be null");
1080
1081 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1082 JVM_END
1083
1084 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1085
1086 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1087 JVM_END
1088
1089 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1090 ResourceMark rm(THREAD);
1091
1092 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1093 char* str = java_lang_String::as_utf8_string(h_name());
1094
1095 // Sanity check, don't expect null
1096 if (str == nullptr) return nullptr;
1097
1098 // Internalize the string, converting '.' to '/' in string.
1099 char* p = (char*)str;
1100 while (*p != '\0') {
1101 if (*p == '.') {
1102 *p = '/';
1103 }
1104 p++;
1105 }
1106
1107 const int str_len = (int)(p - str);
1108 if (str_len > Symbol::max_length()) {
1109 // It's impossible to create this class; the name cannot fit
1110 // into the constant pool.
1111 return nullptr;
1112 }
1113 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1114
1115 // Security Note:
1116 // The Java level wrapper will perform the necessary security check allowing
1117 // us to pass the null as the initiating class loader.
1118 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1119 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1120 h_loader,
1121 Handle());
1122 #if INCLUDE_CDS
1123 if (k == nullptr) {
1124 // If the class is not already loaded, try to see if it's in the shared
1125 // archive for the current classloader (h_loader).
1126 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1127 }
1128 #endif
1129 return (k == nullptr) ? nullptr :
1130 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1131 JVM_END
1132
1133 // Module support //////////////////////////////////////////////////////////////////////////////
1134
1135 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1136 jstring location, jobjectArray packages))
1137 Handle h_module (THREAD, JNIHandles::resolve(module));
1138 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1139 JVM_END
1140
1141 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1142 Handle h_module (THREAD, JNIHandles::resolve(module));
1143 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1144 JVM_END
1145
1146 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1147 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1148 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1149 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1150 JVM_END
1151
1152 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1153 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1154 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1155 JVM_END
1156
1157 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1158 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1159 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1160 JVM_END
1161
1162 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1163 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1164 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1165 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1166 JVM_END
1167
1168 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1169 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1170 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1171 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1172 JVM_END
1173
1174 // Reflection support //////////////////////////////////////////////////////////////////////////////
1175
1176 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1177 assert (cls != nullptr, "illegal class");
1178 JvmtiVMObjectAllocEventCollector oam;
1179 ResourceMark rm(THREAD);
1180 HandleMark hm(THREAD);
1181 Handle java_class(THREAD, JNIHandles::resolve(cls));
1182 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1183 return (jstring) JNIHandles::make_local(THREAD, result);
1184 JVM_END
1185
1186
1187 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1188 JvmtiVMObjectAllocEventCollector oam;
1189 oop mirror = JNIHandles::resolve_non_null(cls);
1190
1191 // Special handling for primitive objects
1192 if (java_lang_Class::is_primitive(mirror)) {
1193 // Primitive objects does not have any interfaces
1194 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1195 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1196 }
1197
1198 Klass* klass = java_lang_Class::as_Klass(mirror);
1199 // Figure size of result array
1200 int size;
1201 if (klass->is_instance_klass()) {
1202 InstanceKlass* ik = InstanceKlass::cast(klass);
1203 size = ik->local_interfaces()->length();
1204 } else {
1205 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1206 size = 2;
1207 }
1208
1209 // Allocate result array
1210 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1211 objArrayHandle result (THREAD, r);
1212 // Fill in result
1213 if (klass->is_instance_klass()) {
1214 // Regular instance klass, fill in all local interfaces
1215 for (int index = 0; index < size; index++) {
1216 InstanceKlass* ik = InstanceKlass::cast(klass);
1217 Klass* k = ik->local_interfaces()->at(index);
1218 result->obj_at_put(index, k->java_mirror());
1219 }
1220 } else {
1221 // All arrays implement java.lang.Cloneable and java.io.Serializable
1222 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1223 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1224 }
1225 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1226 JVM_END
1227
1228
1229 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1230 oop mirror = JNIHandles::resolve_non_null(cls);
1231 if (java_lang_Class::is_primitive(mirror)) {
1232 return JNI_FALSE;
1233 }
1234 Klass* k = java_lang_Class::as_Klass(mirror);
1235 jboolean result = k->is_interface();
1236 assert(!result || k->is_instance_klass(),
1237 "all interfaces are instance types");
1238 // The compiler intrinsic for isInterface tests the
1239 // Klass::_access_flags bits in the same way.
1240 return result;
1241 JVM_END
1242
1243 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1244 oop mirror = JNIHandles::resolve_non_null(cls);
1245 if (java_lang_Class::is_primitive(mirror)) {
1246 return JNI_FALSE;
1247 }
1248 Klass* k = java_lang_Class::as_Klass(mirror);
1249 return k->is_hidden();
1250 JVM_END
1251
1252 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls))
1253 oop mirror = JNIHandles::resolve_non_null(cls);
1254 if (java_lang_Class::is_primitive(mirror)) {
1255 return JNI_FALSE;
1256 }
1257 Klass* k = java_lang_Class::as_Klass(mirror);
1258 if (EnableValhalla) {
1259 return k->is_array_klass() || k->is_identity_class();
1260 } else {
1261 return k->is_interface() ? JNI_FALSE : JNI_TRUE;
1262 }
1263 JVM_END
1264
1265 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1266 JvmtiVMObjectAllocEventCollector oam;
1267 oop mirror = JNIHandles::resolve_non_null(cls);
1268 if (java_lang_Class::is_primitive(mirror)) {
1269 // There are no signers for primitive types
1270 return nullptr;
1271 }
1272
1273 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1274
1275 // If there are no signers set in the class, or if the class
1276 // is an array, return null.
1277 if (signers == nullptr) return nullptr;
1278
1279 // copy of the signers array
1280 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1281 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1282 for (int index = 0; index < signers->length(); index++) {
1283 signers_copy->obj_at_put(index, signers->obj_at(index));
1284 }
1285
1286 // return the copy
1287 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1288 JVM_END
1289
1290
1291 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1292 oop mirror = JNIHandles::resolve_non_null(cls);
1293 if (!java_lang_Class::is_primitive(mirror)) {
1294 // This call is ignored for primitive types and arrays.
1295 // Signers are only set once, ClassLoader.java, and thus shouldn't
1296 // be called with an array. Only the bootstrap loader creates arrays.
1297 Klass* k = java_lang_Class::as_Klass(mirror);
1298 if (k->is_instance_klass()) {
1299 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1300 }
1301 }
1302 JVM_END
1303
1304
1305 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1306 oop mirror = JNIHandles::resolve_non_null(cls);
1307 if (mirror == nullptr) {
1308 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1309 }
1310
1311 if (java_lang_Class::is_primitive(mirror)) {
1312 // Primitive types does not have a protection domain.
1313 return nullptr;
1314 }
1315
1316 oop pd = java_lang_Class::protection_domain(mirror);
1317 return (jobject) JNIHandles::make_local(THREAD, pd);
1318 JVM_END
1319
1320
1321 // Returns the inherited_access_control_context field of the running thread.
1322 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1323 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1324 return JNIHandles::make_local(THREAD, result);
1325 JVM_END
1326
1327 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1328 if (!UsePrivilegedStack) return nullptr;
1329
1330 ResourceMark rm(THREAD);
1331 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1332 JvmtiVMObjectAllocEventCollector oam;
1333
1334 // count the protection domains on the execution stack. We collapse
1335 // duplicate consecutive protection domains into a single one, as
1336 // well as stopping when we hit a privileged frame.
1337
1338 oop previous_protection_domain = nullptr;
1339 Handle privileged_context(thread, nullptr);
1340 bool is_privileged = false;
1341 oop protection_domain = nullptr;
1342
1343 // Iterate through Java frames
1344 vframeStream vfst(thread);
1345 for(; !vfst.at_end(); vfst.next()) {
1346 // get method of frame
1347 Method* method = vfst.method();
1348
1349 // stop at the first privileged frame
1350 if (method->method_holder() == vmClasses::AccessController_klass() &&
1351 method->name() == vmSymbols::executePrivileged_name())
1352 {
1353 // this frame is privileged
1354 is_privileged = true;
1355
1356 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1357
1358 StackValueCollection* locals = priv->locals();
1359 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1360 StackValue* clr_sv = locals->at(2); // Class<?> caller
1361 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1362 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1363 privileged_context = ctx_sv->get_obj();
1364 Handle caller = clr_sv->get_obj();
1365
1366 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1367 protection_domain = caller_klass->protection_domain();
1368 } else {
1369 protection_domain = method->method_holder()->protection_domain();
1370 }
1371
1372 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1373 local_array->push(Handle(thread, protection_domain));
1374 previous_protection_domain = protection_domain;
1375 }
1376
1377 if (is_privileged) break;
1378 }
1379
1380
1381 // either all the domains on the stack were system domains, or
1382 // we had a privileged system domain
1383 if (local_array->is_empty()) {
1384 if (is_privileged && privileged_context.is_null()) return nullptr;
1385
1386 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1387 return JNIHandles::make_local(THREAD, result);
1388 }
1389
1390 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1391 local_array->length(), CHECK_NULL);
1392 objArrayHandle h_context(thread, context);
1393 for (int index = 0; index < local_array->length(); index++) {
1394 h_context->obj_at_put(index, local_array->at(index)());
1395 }
1396
1397 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1398
1399 return JNIHandles::make_local(THREAD, result);
1400 JVM_END
1401
1402 class ScopedValueBindingsResolver {
1403 public:
1404 InstanceKlass* Carrier_klass;
1405 ScopedValueBindingsResolver(JavaThread* THREAD) {
1406 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1407 Carrier_klass = InstanceKlass::cast(k);
1408 }
1409 };
1410
1411 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1412 ResourceMark rm(THREAD);
1413 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1414 JvmtiVMObjectAllocEventCollector oam;
1415
1416 static ScopedValueBindingsResolver resolver(THREAD);
1417
1418 // Iterate through Java frames
1419 vframeStream vfst(thread);
1420 for(; !vfst.at_end(); vfst.next()) {
1421 int loc = -1;
1422 // get method of frame
1423 Method* method = vfst.method();
1424
1425 Symbol *name = method->name();
1426
1427 InstanceKlass* holder = method->method_holder();
1428 if (name == vmSymbols::runWith_method_name()) {
1429 if (holder == vmClasses::Thread_klass()
1430 || holder == resolver.Carrier_klass) {
1431 loc = 1;
1432 }
1433 }
1434
1435 if (loc != -1) {
1436 javaVFrame *frame = vfst.asJavaVFrame();
1437 StackValueCollection* locals = frame->locals();
1438 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1439 Handle result = head_sv->get_obj();
1440 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1441 if (result() != nullptr) {
1442 return JNIHandles::make_local(THREAD, result());
1443 }
1444 }
1445 }
1446
1447 return nullptr;
1448 JVM_END
1449
1450 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1452 return (k != nullptr) && k->is_array_klass() ? true : false;
1453 JVM_END
1454
1455
1456 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1457 oop mirror = JNIHandles::resolve_non_null(cls);
1458 return (jboolean) java_lang_Class::is_primitive(mirror);
1459 JVM_END
1460
1461
1462 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1463 oop mirror = JNIHandles::resolve_non_null(cls);
1464 if (java_lang_Class::is_primitive(mirror)) {
1465 // Primitive type
1466 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1467 }
1468
1469 Klass* k = java_lang_Class::as_Klass(mirror);
1470 debug_only(int computed_modifiers = k->compute_modifier_flags());
1471 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1472 return k->modifier_flags();
1473 JVM_END
1474
1475
1476 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1477
1478 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1479 JvmtiVMObjectAllocEventCollector oam;
1480 // ofClass is a reference to a java_lang_Class object. The mirror object
1481 // of an InstanceKlass
1482 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1483 if (java_lang_Class::is_primitive(ofMirror) ||
1484 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1485 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1486 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1487 }
1488
1489 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1490 InnerClassesIterator iter(k);
1491
1492 if (iter.length() == 0) {
1493 // Neither an inner nor outer class
1494 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1495 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1496 }
1497
1498 // find inner class info
1499 constantPoolHandle cp(thread, k->constants());
1500 int length = iter.length();
1501
1502 // Allocate temp. result array
1503 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1504 objArrayHandle result (THREAD, r);
1505 int members = 0;
1506
1507 for (; !iter.done(); iter.next()) {
1508 int ioff = iter.inner_class_info_index();
1509 int ooff = iter.outer_class_info_index();
1510
1511 if (ioff != 0 && ooff != 0) {
1512 // Check to see if the name matches the class we're looking for
1513 // before attempting to find the class.
1514 if (cp->klass_name_at_matches(k, ooff)) {
1515 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1516 if (outer_klass == k) {
1517 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1518 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1519
1520 // Throws an exception if outer klass has not declared k as
1521 // an inner klass
1522 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1523
1524 result->obj_at_put(members, inner_klass->java_mirror());
1525 members++;
1526 }
1527 }
1528 }
1529 }
1530
1531 if (members != length) {
1532 // Return array of right length
1533 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1534 for(int i = 0; i < members; i++) {
1535 res->obj_at_put(i, result->obj_at(i));
1536 }
1537 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1538 }
1539
1540 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1541 JVM_END
1542
1543
1544 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1545 {
1546 // ofClass is a reference to a java_lang_Class object.
1547 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1548 if (java_lang_Class::is_primitive(ofMirror)) {
1549 return nullptr;
1550 }
1551 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1552 if (!klass->is_instance_klass()) {
1553 return nullptr;
1554 }
1555
1556 bool inner_is_member = false;
1557 Klass* outer_klass
1558 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1559 if (outer_klass == nullptr) return nullptr; // already a top-level class
1560 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1561 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1562 }
1563 JVM_END
1564
1565 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1566 {
1567 oop mirror = JNIHandles::resolve_non_null(cls);
1568 if (java_lang_Class::is_primitive(mirror)) {
1569 return nullptr;
1570 }
1571 Klass* klass = java_lang_Class::as_Klass(mirror);
1572 if (!klass->is_instance_klass()) {
1573 return nullptr;
1574 }
1575 InstanceKlass* k = InstanceKlass::cast(klass);
1576 int ooff = 0, noff = 0;
1577 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1578 if (noff != 0) {
1579 constantPoolHandle i_cp(thread, k->constants());
1580 Symbol* name = i_cp->symbol_at(noff);
1581 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1582 return (jstring) JNIHandles::make_local(THREAD, str());
1583 }
1584 }
1585 return nullptr;
1586 }
1587 JVM_END
1588
1589 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1590 assert (cls != nullptr, "illegal class");
1591 JvmtiVMObjectAllocEventCollector oam;
1592 ResourceMark rm(THREAD);
1593 oop mirror = JNIHandles::resolve_non_null(cls);
1594 // Return null for arrays and primitives
1595 if (!java_lang_Class::is_primitive(mirror)) {
1596 Klass* k = java_lang_Class::as_Klass(mirror);
1597 if (k->is_instance_klass()) {
1598 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1599 if (sym == nullptr) return nullptr;
1600 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1601 return (jstring) JNIHandles::make_local(THREAD, str());
1602 }
1603 }
1604 return nullptr;
1605 JVM_END
1606
1607
1608 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1609 assert (cls != nullptr, "illegal class");
1610 oop mirror = JNIHandles::resolve_non_null(cls);
1611 // Return null for arrays and primitives
1612 if (!java_lang_Class::is_primitive(mirror)) {
1613 Klass* k = java_lang_Class::as_Klass(mirror);
1614 if (k->is_instance_klass()) {
1615 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1616 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1617 }
1618 }
1619 return nullptr;
1620 JVM_END
1621
1622
1623 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1624 // some of this code was adapted from from jni_FromReflectedField
1625
1626 oop reflected = JNIHandles::resolve_non_null(field);
1627 oop mirror = java_lang_reflect_Field::clazz(reflected);
1628 Klass* k = java_lang_Class::as_Klass(mirror);
1629 int slot = java_lang_reflect_Field::slot(reflected);
1630 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1631
1632 InstanceKlass* ik = InstanceKlass::cast(k);
1633 intptr_t offset = ik->field_offset(slot);
1634
1635 if (modifiers & JVM_ACC_STATIC) {
1636 // for static fields we only look in the current class
1637 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1638 assert(false, "cannot find static field");
1639 return false;
1640 }
1641 } else {
1642 // for instance fields we start with the current class and work
1643 // our way up through the superclass chain
1644 if (!ik->find_field_from_offset(offset, false, &fd)) {
1645 assert(false, "cannot find instance field");
1646 return false;
1647 }
1648 }
1649 return true;
1650 }
1651
1652 static Method* jvm_get_method_common(jobject method) {
1653 // some of this code was adapted from from jni_FromReflectedMethod
1654
1655 oop reflected = JNIHandles::resolve_non_null(method);
1656 oop mirror = nullptr;
1657 int slot = 0;
1658
1659 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1660 mirror = java_lang_reflect_Constructor::clazz(reflected);
1661 slot = java_lang_reflect_Constructor::slot(reflected);
1662 } else {
1663 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1664 "wrong type");
1665 mirror = java_lang_reflect_Method::clazz(reflected);
1666 slot = java_lang_reflect_Method::slot(reflected);
1667 }
1668 Klass* k = java_lang_Class::as_Klass(mirror);
1669
1670 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1671 assert(m != nullptr, "cannot find method");
1672 return m; // caller has to deal with null in product mode
1673 }
1674
1675 /* Type use annotations support (JDK 1.8) */
1676
1677 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1678 assert (cls != nullptr, "illegal class");
1679 ResourceMark rm(THREAD);
1680 // Return null for arrays and primitives
1681 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1682 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1683 if (k->is_instance_klass()) {
1684 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1685 if (type_annotations != nullptr) {
1686 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1687 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1688 }
1689 }
1690 }
1691 return nullptr;
1692 JVM_END
1693
1694 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1695 assert (method != nullptr, "illegal method");
1696 // method is a handle to a java.lang.reflect.Method object
1697 Method* m = jvm_get_method_common(method);
1698 if (m == nullptr) {
1699 return nullptr;
1700 }
1701
1702 AnnotationArray* type_annotations = m->type_annotations();
1703 if (type_annotations != nullptr) {
1704 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1705 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1706 }
1707
1708 return nullptr;
1709 JVM_END
1710
1711 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1712 assert (field != nullptr, "illegal field");
1713 fieldDescriptor fd;
1714 bool gotFd = jvm_get_field_common(field, fd);
1715 if (!gotFd) {
1716 return nullptr;
1717 }
1718
1719 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1720 JVM_END
1721
1722 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1723 if (!cp->is_within_bounds(index)) {
1724 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1725 }
1726 }
1727
1728 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1729 {
1730 // method is a handle to a java.lang.reflect.Method object
1731 Method* method_ptr = jvm_get_method_common(method);
1732 methodHandle mh (THREAD, method_ptr);
1733 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1734 const int num_params = mh->method_parameters_length();
1735
1736 if (num_params < 0) {
1737 // A -1 return value from method_parameters_length means there is no
1738 // parameter data. Return null to indicate this to the reflection
1739 // API.
1740 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1741 return (jobjectArray)nullptr;
1742 } else {
1743 // Otherwise, we return something up to reflection, even if it is
1744 // a zero-length array. Why? Because in some cases this can
1745 // trigger a MalformedParametersException.
1746
1747 // make sure all the symbols are properly formatted
1748 for (int i = 0; i < num_params; i++) {
1749 MethodParametersElement* params = mh->method_parameters_start();
1750 int index = params[i].name_cp_index;
1751 constantPoolHandle cp(THREAD, mh->constants());
1752 bounds_check(cp, index, CHECK_NULL);
1753
1754 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1755 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1756 "Wrong type at constant pool index");
1757 }
1758
1759 }
1760
1761 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1762 objArrayHandle result (THREAD, result_oop);
1763
1764 for (int i = 0; i < num_params; i++) {
1765 MethodParametersElement* params = mh->method_parameters_start();
1766 // For a 0 index, give a null symbol
1767 Symbol* sym = 0 != params[i].name_cp_index ?
1768 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1769 int flags = params[i].flags;
1770 oop param = Reflection::new_parameter(reflected_method, i, sym,
1771 flags, CHECK_NULL);
1772 result->obj_at_put(i, param);
1773 }
1774 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1775 }
1776 }
1777 JVM_END
1778
1779 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1780
1781 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1782 {
1783 JvmtiVMObjectAllocEventCollector oam;
1784
1785 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1786 // Exclude primitive types and array types
1787 if (java_lang_Class::is_primitive(ofMirror) ||
1788 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1789 // Return empty array
1790 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1791 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1792 }
1793
1794 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1795 constantPoolHandle cp(THREAD, k->constants());
1796
1797 // Ensure class is linked
1798 k->link_class(CHECK_NULL);
1799
1800 // Allocate result
1801 int num_fields;
1802
1803 if (publicOnly) {
1804 num_fields = 0;
1805 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1806 if (fs.access_flags().is_public()) ++num_fields;
1807 }
1808 } else {
1809 num_fields = k->java_fields_count();
1810 }
1811
1812 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1813 objArrayHandle result (THREAD, r);
1814
1815 int out_idx = 0;
1816 fieldDescriptor fd;
1817 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1818 if (!publicOnly || fs.access_flags().is_public()) {
1819 fd.reinitialize(k, fs.index());
1820 oop field = Reflection::new_field(&fd, CHECK_NULL);
1821 result->obj_at_put(out_idx, field);
1822 ++out_idx;
1823 }
1824 }
1825 assert(out_idx == num_fields, "just checking");
1826 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1827 }
1828 JVM_END
1829
1830 // A class is a record if and only if it is final and a direct subclass of
1831 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1832 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1833 {
1834 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1835 if (k != nullptr && k->is_instance_klass()) {
1836 InstanceKlass* ik = InstanceKlass::cast(k);
1837 return ik->is_record();
1838 } else {
1839 return false;
1840 }
1841 }
1842 JVM_END
1843
1844 // Returns an array containing the components of the Record attribute,
1845 // or null if the attribute is not present.
1846 //
1847 // Note that this function returns the components of the Record attribute
1848 // even if the class is not a record.
1849 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1850 {
1851 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1852 assert(c->is_instance_klass(), "must be");
1853 InstanceKlass* ik = InstanceKlass::cast(c);
1854
1855 Array<RecordComponent*>* components = ik->record_components();
1856 if (components != nullptr) {
1857 JvmtiVMObjectAllocEventCollector oam;
1858 constantPoolHandle cp(THREAD, ik->constants());
1859 int length = components->length();
1860 assert(length >= 0, "unexpected record_components length");
1861 objArrayOop record_components =
1862 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1863 objArrayHandle components_h (THREAD, record_components);
1864
1865 for (int x = 0; x < length; x++) {
1866 RecordComponent* component = components->at(x);
1867 assert(component != nullptr, "unexpected null record component");
1868 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1869 components_h->obj_at_put(x, component_oop);
1870 }
1871 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1872 }
1873
1874 return nullptr;
1875 }
1876 JVM_END
1877
1878 static bool select_method(const methodHandle& method, bool want_constructor) {
1879 bool is_ctor = (method->is_object_constructor() ||
1880 method->is_static_vnew_factory());
1881 if (want_constructor) {
1882 return is_ctor;
1883 } else {
1884 return (!is_ctor &&
1885 !method->is_class_initializer() &&
1886 !method->is_overpass());
1887 }
1888 }
1889
1890 static jobjectArray get_class_declared_methods_helper(
1891 JNIEnv *env,
1892 jclass ofClass, jboolean publicOnly,
1893 bool want_constructor,
1894 Klass* klass, TRAPS) {
1895
1896 JvmtiVMObjectAllocEventCollector oam;
1897
1898 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1899 // Exclude primitive types and array types
1900 if (java_lang_Class::is_primitive(ofMirror)
1901 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1902 // Return empty array
1903 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1904 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1905 }
1906
1907 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1908
1909 // Ensure class is linked
1910 k->link_class(CHECK_NULL);
1911
1912 Array<Method*>* methods = k->methods();
1913 int methods_length = methods->length();
1914
1915 // Save original method_idnum in case of redefinition, which can change
1916 // the idnum of obsolete methods. The new method will have the same idnum
1917 // but if we refresh the methods array, the counts will be wrong.
1918 ResourceMark rm(THREAD);
1919 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1920 int num_methods = 0;
1921
1922 for (int i = 0; i < methods_length; i++) {
1923 methodHandle method(THREAD, methods->at(i));
1924 if (select_method(method, want_constructor)) {
1925 if (!publicOnly || method->is_public()) {
1926 idnums->push(method->method_idnum());
1927 ++num_methods;
1928 }
1929 }
1930 }
1931
1932 // Allocate result
1933 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1934 objArrayHandle result (THREAD, r);
1935
1936 // Now just put the methods that we selected above, but go by their idnum
1937 // in case of redefinition. The methods can be redefined at any safepoint,
1938 // so above when allocating the oop array and below when creating reflect
1939 // objects.
1940 for (int i = 0; i < num_methods; i++) {
1941 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1942 if (method.is_null()) {
1943 // Method may have been deleted and seems this API can handle null
1944 // Otherwise should probably put a method that throws NSME
1945 result->obj_at_put(i, nullptr);
1946 } else {
1947 oop m;
1948 if (want_constructor) {
1949 assert(method->is_object_constructor() ||
1950 method->is_static_vnew_factory(), "must be");
1951 m = Reflection::new_constructor(method, CHECK_NULL);
1952 } else {
1953 m = Reflection::new_method(method, false, CHECK_NULL);
1954 }
1955 result->obj_at_put(i, m);
1956 }
1957 }
1958
1959 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1960 }
1961
1962 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1963 {
1964 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1965 /*want_constructor*/ false,
1966 vmClasses::reflect_Method_klass(), THREAD);
1967 }
1968 JVM_END
1969
1970 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1971 {
1972 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1973 /*want_constructor*/ true,
1974 vmClasses::reflect_Constructor_klass(), THREAD);
1975 }
1976 JVM_END
1977
1978 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1979 {
1980 oop mirror = JNIHandles::resolve_non_null(cls);
1981 if (java_lang_Class::is_primitive(mirror)) {
1982 // Primitive type
1983 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1984 }
1985
1986 Klass* k = java_lang_Class::as_Klass(mirror);
1987 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1988 }
1989 JVM_END
1990
1991 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1992 {
1993 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1994 assert(c->is_instance_klass(), "must be");
1995 InstanceKlass* ck = InstanceKlass::cast(c);
1996 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1997 assert(m->is_instance_klass(), "must be");
1998 InstanceKlass* mk = InstanceKlass::cast(m);
1999 return ck->has_nestmate_access_to(mk, THREAD);
2000 }
2001 JVM_END
2002
2003 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2004 {
2005 // current is not a primitive or array class
2006 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2007 assert(c->is_instance_klass(), "must be");
2008 InstanceKlass* ck = InstanceKlass::cast(c);
2009 InstanceKlass* host = ck->nest_host(THREAD);
2010 return (jclass) (host == nullptr ? nullptr :
2011 JNIHandles::make_local(THREAD, host->java_mirror()));
2012 }
2013 JVM_END
2014
2015 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2016 {
2017 // current is not a primitive or array class
2018 ResourceMark rm(THREAD);
2019 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2020 assert(c->is_instance_klass(), "must be");
2021 InstanceKlass* ck = InstanceKlass::cast(c);
2022 InstanceKlass* host = ck->nest_host(THREAD);
2023
2024 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2025 ck->external_name(), host->external_name());
2026 {
2027 JvmtiVMObjectAllocEventCollector oam;
2028 Array<u2>* members = host->nest_members();
2029 int length = members == nullptr ? 0 : members->length();
2030
2031 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2032
2033 // nest host is first in the array so make it one bigger
2034 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2035 length + 1, CHECK_NULL);
2036 objArrayHandle result(THREAD, r);
2037 result->obj_at_put(0, host->java_mirror());
2038 if (length != 0) {
2039 int count = 0;
2040 for (int i = 0; i < length; i++) {
2041 int cp_index = members->at(i);
2042 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2043 if (HAS_PENDING_EXCEPTION) {
2044 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2045 return nullptr; // propagate VMEs
2046 }
2047 if (log_is_enabled(Trace, class, nestmates)) {
2048 stringStream ss;
2049 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2050 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2051 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2052 log_trace(class, nestmates)("%s", ss.as_string());
2053 }
2054 CLEAR_PENDING_EXCEPTION;
2055 continue;
2056 }
2057 if (k->is_instance_klass()) {
2058 InstanceKlass* ik = InstanceKlass::cast(k);
2059 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2060 if (nest_host_k == host) {
2061 result->obj_at_put(count+1, k->java_mirror());
2062 count++;
2063 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2064 } else {
2065 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2066 ik->external_name(), nest_host_k->external_name());
2067 }
2068 } else {
2069 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2070 k->external_name());
2071 }
2072 }
2073 if (count < length) {
2074 // we had invalid entries so we need to compact the array
2075 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2076 length + 1, count + 1);
2077
2078 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2079 count + 1, CHECK_NULL);
2080 objArrayHandle result2(THREAD, r2);
2081 for (int i = 0; i < count + 1; i++) {
2082 result2->obj_at_put(i, result->obj_at(i));
2083 }
2084 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2085 }
2086 }
2087 else {
2088 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2089 }
2090 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2091 }
2092 }
2093 JVM_END
2094
2095 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2096 {
2097 oop mirror = JNIHandles::resolve_non_null(current);
2098 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2099 Klass* c = java_lang_Class::as_Klass(mirror);
2100 assert(c->is_instance_klass(), "must be");
2101 InstanceKlass* ik = InstanceKlass::cast(c);
2102 ResourceMark rm(THREAD);
2103 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2104 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2105 if (ik->is_sealed()) {
2106 JvmtiVMObjectAllocEventCollector oam;
2107 Array<u2>* subclasses = ik->permitted_subclasses();
2108 int length = subclasses->length();
2109
2110 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2111
2112 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2113 length, CHECK_NULL);
2114 objArrayHandle result(THREAD, r);
2115 int count = 0;
2116 for (int i = 0; i < length; i++) {
2117 int cp_index = subclasses->at(i);
2118 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2119 if (HAS_PENDING_EXCEPTION) {
2120 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2121 return nullptr; // propagate VMEs
2122 }
2123 if (log_is_enabled(Trace, class, sealed)) {
2124 stringStream ss;
2125 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2126 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2127 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2128 log_trace(class, sealed)("%s", ss.as_string());
2129 }
2130
2131 CLEAR_PENDING_EXCEPTION;
2132 continue;
2133 }
2134 if (k->is_instance_klass()) {
2135 result->obj_at_put(count++, k->java_mirror());
2136 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2137 }
2138 }
2139 if (count < length) {
2140 // we had invalid entries so we need to compact the array
2141 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2142 count, CHECK_NULL);
2143 objArrayHandle result2(THREAD, r2);
2144 for (int i = 0; i < count; i++) {
2145 result2->obj_at_put(i, result->obj_at(i));
2146 }
2147 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2148 }
2149 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2150 } else {
2151 return nullptr;
2152 }
2153 }
2154 JVM_END
2155
2156 // Constant pool access //////////////////////////////////////////////////////////
2157
2158 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2159 {
2160 JvmtiVMObjectAllocEventCollector oam;
2161 oop mirror = JNIHandles::resolve_non_null(cls);
2162 // Return null for primitives and arrays
2163 if (!java_lang_Class::is_primitive(mirror)) {
2164 Klass* k = java_lang_Class::as_Klass(mirror);
2165 if (k->is_instance_klass()) {
2166 InstanceKlass* k_h = InstanceKlass::cast(k);
2167 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2168 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2169 return JNIHandles::make_local(THREAD, jcp());
2170 }
2171 }
2172 return nullptr;
2173 }
2174 JVM_END
2175
2176
2177 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2178 {
2179 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2180 return cp->length();
2181 }
2182 JVM_END
2183
2184
2185 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2186 {
2187 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2188 bounds_check(cp, index, CHECK_NULL);
2189 constantTag tag = cp->tag_at(index);
2190 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2191 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2192 }
2193 Klass* k = cp->klass_at(index, CHECK_NULL);
2194 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2195 }
2196 JVM_END
2197
2198 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2199 {
2200 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2201 bounds_check(cp, index, CHECK_NULL);
2202 constantTag tag = cp->tag_at(index);
2203 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2204 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2205 }
2206 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2207 if (k == nullptr) return nullptr;
2208 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2209 }
2210 JVM_END
2211
2212 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2213 constantTag tag = cp->tag_at(index);
2214 if (!tag.is_method() && !tag.is_interface_method()) {
2215 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2216 }
2217 int klass_ref = cp->uncached_klass_ref_index_at(index);
2218 Klass* k_o;
2219 if (force_resolution) {
2220 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2221 } else {
2222 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2223 if (k_o == nullptr) return nullptr;
2224 }
2225 InstanceKlass* k = InstanceKlass::cast(k_o);
2226 Symbol* name = cp->uncached_name_ref_at(index);
2227 Symbol* sig = cp->uncached_signature_ref_at(index);
2228 methodHandle m (THREAD, k->find_method(name, sig));
2229 if (m.is_null()) {
2230 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2231 }
2232 oop method;
2233 if (m->is_object_constructor() || m->is_static_vnew_factory()) {
2234 method = Reflection::new_constructor(m, CHECK_NULL);
2235 } else {
2236 method = Reflection::new_method(m, true, CHECK_NULL);
2237 }
2238 return JNIHandles::make_local(THREAD, method);
2239 }
2240
2241 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2242 {
2243 JvmtiVMObjectAllocEventCollector oam;
2244 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2245 bounds_check(cp, index, CHECK_NULL);
2246 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2247 return res;
2248 }
2249 JVM_END
2250
2251 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2252 {
2253 JvmtiVMObjectAllocEventCollector oam;
2254 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2255 bounds_check(cp, index, CHECK_NULL);
2256 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2257 return res;
2258 }
2259 JVM_END
2260
2261 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2262 constantTag tag = cp->tag_at(index);
2263 if (!tag.is_field()) {
2264 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2265 }
2266 int klass_ref = cp->uncached_klass_ref_index_at(index);
2267 Klass* k_o;
2268 if (force_resolution) {
2269 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2270 } else {
2271 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2272 if (k_o == nullptr) return nullptr;
2273 }
2274 InstanceKlass* k = InstanceKlass::cast(k_o);
2275 Symbol* name = cp->uncached_name_ref_at(index);
2276 Symbol* sig = cp->uncached_signature_ref_at(index);
2277 fieldDescriptor fd;
2278 Klass* target_klass = k->find_field(name, sig, &fd);
2279 if (target_klass == nullptr) {
2280 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2281 }
2282 oop field = Reflection::new_field(&fd, CHECK_NULL);
2283 return JNIHandles::make_local(THREAD, field);
2284 }
2285
2286 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2287 {
2288 JvmtiVMObjectAllocEventCollector oam;
2289 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2290 bounds_check(cp, index, CHECK_NULL);
2291 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2292 return res;
2293 }
2294 JVM_END
2295
2296 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2297 {
2298 JvmtiVMObjectAllocEventCollector oam;
2299 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2300 bounds_check(cp, index, CHECK_NULL);
2301 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2302 return res;
2303 }
2304 JVM_END
2305
2306 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2307 {
2308 JvmtiVMObjectAllocEventCollector oam;
2309 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2310 bounds_check(cp, index, CHECK_NULL);
2311 constantTag tag = cp->tag_at(index);
2312 if (!tag.is_field_or_method()) {
2313 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2314 }
2315 int klass_ref = cp->uncached_klass_ref_index_at(index);
2316 Symbol* klass_name = cp->klass_name_at(klass_ref);
2317 Symbol* member_name = cp->uncached_name_ref_at(index);
2318 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2319 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2320 objArrayHandle dest(THREAD, dest_o);
2321 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2322 dest->obj_at_put(0, str());
2323 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2324 dest->obj_at_put(1, str());
2325 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2326 dest->obj_at_put(2, str());
2327 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2328 }
2329 JVM_END
2330
2331 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2332 {
2333 JvmtiVMObjectAllocEventCollector oam;
2334 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2335 bounds_check(cp, index, CHECK_0);
2336 constantTag tag = cp->tag_at(index);
2337 if (!tag.is_field_or_method()) {
2338 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2339 }
2340 return (jint) cp->uncached_klass_ref_index_at(index);
2341 }
2342 JVM_END
2343
2344 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2345 {
2346 JvmtiVMObjectAllocEventCollector oam;
2347 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2348 bounds_check(cp, index, CHECK_0);
2349 constantTag tag = cp->tag_at(index);
2350 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2351 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2352 }
2353 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2354 }
2355 JVM_END
2356
2357 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2358 {
2359 JvmtiVMObjectAllocEventCollector oam;
2360 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2361 bounds_check(cp, index, CHECK_NULL);
2362 constantTag tag = cp->tag_at(index);
2363 if (!tag.is_name_and_type()) {
2364 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2365 }
2366 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2367 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2368 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2369 objArrayHandle dest(THREAD, dest_o);
2370 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2371 dest->obj_at_put(0, str());
2372 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2373 dest->obj_at_put(1, str());
2374 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2375 }
2376 JVM_END
2377
2378 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2379 {
2380 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2381 bounds_check(cp, index, CHECK_0);
2382 constantTag tag = cp->tag_at(index);
2383 if (!tag.is_int()) {
2384 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2385 }
2386 return cp->int_at(index);
2387 }
2388 JVM_END
2389
2390 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2391 {
2392 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2393 bounds_check(cp, index, CHECK_(0L));
2394 constantTag tag = cp->tag_at(index);
2395 if (!tag.is_long()) {
2396 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2397 }
2398 return cp->long_at(index);
2399 }
2400 JVM_END
2401
2402 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2403 {
2404 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2405 bounds_check(cp, index, CHECK_(0.0f));
2406 constantTag tag = cp->tag_at(index);
2407 if (!tag.is_float()) {
2408 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2409 }
2410 return cp->float_at(index);
2411 }
2412 JVM_END
2413
2414 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2415 {
2416 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2417 bounds_check(cp, index, CHECK_(0.0));
2418 constantTag tag = cp->tag_at(index);
2419 if (!tag.is_double()) {
2420 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2421 }
2422 return cp->double_at(index);
2423 }
2424 JVM_END
2425
2426 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2427 {
2428 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2429 bounds_check(cp, index, CHECK_NULL);
2430 constantTag tag = cp->tag_at(index);
2431 if (!tag.is_string()) {
2432 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2433 }
2434 oop str = cp->string_at(index, CHECK_NULL);
2435 return (jstring) JNIHandles::make_local(THREAD, str);
2436 }
2437 JVM_END
2438
2439 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2440 {
2441 JvmtiVMObjectAllocEventCollector oam;
2442 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2443 bounds_check(cp, index, CHECK_NULL);
2444 constantTag tag = cp->tag_at(index);
2445 if (!tag.is_symbol()) {
2446 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2447 }
2448 Symbol* sym = cp->symbol_at(index);
2449 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2450 return (jstring) JNIHandles::make_local(THREAD, str());
2451 }
2452 JVM_END
2453
2454 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2455 {
2456 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2457 bounds_check(cp, index, CHECK_0);
2458 constantTag tag = cp->tag_at(index);
2459 jbyte result = tag.value();
2460 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2461 // they are changed to the corresponding tags from the JVM spec, so that java code in
2462 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2463 if (tag.is_klass_or_reference()) {
2464 result = JVM_CONSTANT_Class;
2465 } else if (tag.is_string_index()) {
2466 result = JVM_CONSTANT_String;
2467 } else if (tag.is_method_type_in_error()) {
2468 result = JVM_CONSTANT_MethodType;
2469 } else if (tag.is_method_handle_in_error()) {
2470 result = JVM_CONSTANT_MethodHandle;
2471 } else if (tag.is_dynamic_constant_in_error()) {
2472 result = JVM_CONSTANT_Dynamic;
2473 }
2474 return result;
2475 }
2476 JVM_END
2477
2478 // Assertion support. //////////////////////////////////////////////////////////
2479
2480 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2481 assert(cls != nullptr, "bad class");
2482
2483 oop r = JNIHandles::resolve(cls);
2484 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2485 if (java_lang_Class::is_primitive(r)) return false;
2486
2487 Klass* k = java_lang_Class::as_Klass(r);
2488 assert(k->is_instance_klass(), "must be an instance klass");
2489 if (!k->is_instance_klass()) return false;
2490
2491 ResourceMark rm(THREAD);
2492 const char* name = k->name()->as_C_string();
2493 bool system_class = k->class_loader() == nullptr;
2494 return JavaAssertions::enabled(name, system_class);
2495
2496 JVM_END
2497
2498
2499 // Return a new AssertionStatusDirectives object with the fields filled in with
2500 // command-line assertion arguments (i.e., -ea, -da).
2501 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2502 JvmtiVMObjectAllocEventCollector oam;
2503 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2504 return JNIHandles::make_local(THREAD, asd);
2505 JVM_END
2506
2507 // Arrays support /////////////////////////////////////////////////////////////
2508
2509 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2510 oop o = JNIHandles::resolve(array);
2511 Klass* k = o->klass();
2512 if ((o == nullptr) || (!k->is_array_klass())) {
2513 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2514 }
2515 return ArrayKlass::cast(k)->element_access_is_atomic();
2516 JVM_END
2517
2518 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2519 oop o = JNIHandles::resolve(array);
2520 Klass* k = o->klass();
2521 if ((o == nullptr) || (!k->is_array_klass())) {
2522 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2523 }
2524 if (k->is_flatArray_klass()) {
2525 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2526 if (!vk->element_access_is_atomic()) {
2527 /**
2528 * Need to decide how to implement:
2529 *
2530 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2531 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2532 * "checkcast" & "instanceof"
2533 *
2534 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2535 * possibly per instance lock structure. Said info, could be placed in
2536 * "trailer" rather than disturb the current arrayOop
2537 */
2538 Unimplemented();
2539 }
2540 }
2541 return array;
2542 JVM_END
2543
2544 // Verification ////////////////////////////////////////////////////////////////////////////////
2545
2546 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2547
2548 // RedefineClasses support: bug 6214132 caused verification to fail.
2549 // All functions from this section should call the jvmtiThreadSate function:
2550 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2551 // The function returns a Klass* of the _scratch_class if the verifier
2552 // was invoked in the middle of the class redefinition.
2553 // Otherwise it returns its argument value which is the _the_class Klass*.
2554 // Please, refer to the description in the jvmtiThreadSate.hpp.
2555
2556 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2558 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2559 return k->name()->as_utf8();
2560 JVM_END
2561
2562
2563 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2564 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2565 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2566 // types will have length zero if this is not an InstanceKlass
2567 // (length is determined by call to JVM_GetClassCPEntriesCount)
2568 if (k->is_instance_klass()) {
2569 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2570 for (int index = cp->length() - 1; index >= 0; index--) {
2571 constantTag tag = cp->tag_at(index);
2572 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2573 }
2574 }
2575 JVM_END
2576
2577
2578 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2582 JVM_END
2583
2584
2585 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2586 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2587 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2588 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2589 JVM_END
2590
2591
2592 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2595 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2596 JVM_END
2597
2598
2599 // The following methods, used for the verifier, are never called with
2600 // array klasses, so a direct cast to InstanceKlass is safe.
2601 // Typically, these methods are called in a loop with bounds determined
2602 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2603 // zero for arrays.
2604 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2605 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2606 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2607 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2608 int length = method->checked_exceptions_length();
2609 if (length > 0) {
2610 CheckedExceptionElement* table= method->checked_exceptions_start();
2611 for (int i = 0; i < length; i++) {
2612 exceptions[i] = table[i].class_cp_index;
2613 }
2614 }
2615 JVM_END
2616
2617
2618 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
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->checked_exceptions_length();
2623 JVM_END
2624
2625
2626 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2627 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2628 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2629 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2630 memcpy(code, method->code_base(), method->code_size());
2631 JVM_END
2632
2633
2634 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(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->code_size();
2639 JVM_END
2640
2641
2642 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
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 ExceptionTable extable(method);
2647 entry->start_pc = extable.start_pc(entry_index);
2648 entry->end_pc = extable.end_pc(entry_index);
2649 entry->handler_pc = extable.handler_pc(entry_index);
2650 entry->catchType = extable.catch_type_index(entry_index);
2651 JVM_END
2652
2653
2654 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2656 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2657 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2658 return method->exception_table_length();
2659 JVM_END
2660
2661
2662 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2664 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2665 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2666 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2667 JVM_END
2668
2669
2670 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2671 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2672 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2673 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2674 JVM_END
2675
2676
2677 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2678 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2679 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2680 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2681 return method->max_locals();
2682 JVM_END
2683
2684
2685 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2686 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2687 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2688 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2689 return method->size_of_parameters();
2690 JVM_END
2691
2692
2693 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2694 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2695 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2696 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2697 return method->verifier_max_stack();
2698 JVM_END
2699
2700
2701 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2702 ResourceMark rm(THREAD);
2703 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2704 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2705 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2706 return method->is_object_constructor();
2707 JVM_END
2708
2709
2710 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2711 ResourceMark rm(THREAD);
2712 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2713 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2714 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2715 return method->is_overpass();
2716 JVM_END
2717
2718 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2719 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2720 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2721 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2722 return method->name()->as_utf8();
2723 JVM_END
2724
2725
2726 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2727 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2728 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2729 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2730 return method->signature()->as_utf8();
2731 JVM_END
2732
2733 /**
2734 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2735 * read entries in the constant pool. Since the old verifier always
2736 * works on a copy of the code, it will not see any rewriting that
2737 * may possibly occur in the middle of verification. So it is important
2738 * that nothing it calls tries to use the cpCache instead of the raw
2739 * constant pool, so we must use cp->uncached_x methods when appropriate.
2740 */
2741 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2742 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2743 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2744 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2745 switch (cp->tag_at(cp_index).value()) {
2746 case JVM_CONSTANT_Fieldref:
2747 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2748 default:
2749 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2750 }
2751 ShouldNotReachHere();
2752 return nullptr;
2753 JVM_END
2754
2755
2756 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2757 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2758 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2759 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2760 switch (cp->tag_at(cp_index).value()) {
2761 case JVM_CONSTANT_InterfaceMethodref:
2762 case JVM_CONSTANT_Methodref:
2763 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2764 default:
2765 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2766 }
2767 ShouldNotReachHere();
2768 return nullptr;
2769 JVM_END
2770
2771
2772 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2773 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2774 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2775 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2776 switch (cp->tag_at(cp_index).value()) {
2777 case JVM_CONSTANT_InterfaceMethodref:
2778 case JVM_CONSTANT_Methodref:
2779 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2780 default:
2781 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2782 }
2783 ShouldNotReachHere();
2784 return nullptr;
2785 JVM_END
2786
2787
2788 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2789 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2790 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2791 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2792 switch (cp->tag_at(cp_index).value()) {
2793 case JVM_CONSTANT_Fieldref:
2794 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2795 default:
2796 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2797 }
2798 ShouldNotReachHere();
2799 return nullptr;
2800 JVM_END
2801
2802
2803 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2804 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2805 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2806 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2807 Symbol* classname = cp->klass_name_at(cp_index);
2808 return classname->as_utf8();
2809 JVM_END
2810
2811
2812 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2813 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2814 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2815 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2816 switch (cp->tag_at(cp_index).value()) {
2817 case JVM_CONSTANT_Fieldref: {
2818 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2819 Symbol* classname = cp->klass_name_at(class_index);
2820 return classname->as_utf8();
2821 }
2822 default:
2823 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2824 }
2825 ShouldNotReachHere();
2826 return nullptr;
2827 JVM_END
2828
2829
2830 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2831 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2832 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2833 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2834 switch (cp->tag_at(cp_index).value()) {
2835 case JVM_CONSTANT_Methodref:
2836 case JVM_CONSTANT_InterfaceMethodref: {
2837 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2838 Symbol* classname = cp->klass_name_at(class_index);
2839 return classname->as_utf8();
2840 }
2841 default:
2842 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2843 }
2844 ShouldNotReachHere();
2845 return nullptr;
2846 JVM_END
2847
2848
2849 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2850 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2851 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2852 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2853 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2854 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2855 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2856 switch (cp->tag_at(cp_index).value()) {
2857 case JVM_CONSTANT_Fieldref: {
2858 Symbol* name = cp->uncached_name_ref_at(cp_index);
2859 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2860 InstanceKlass* ik = InstanceKlass::cast(k_called);
2861 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2862 if (fs.name() == name && fs.signature() == signature) {
2863 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2864 }
2865 }
2866 return -1;
2867 }
2868 default:
2869 fatal("JVM_GetCPFieldModifiers: illegal constant");
2870 }
2871 ShouldNotReachHere();
2872 return 0;
2873 JVM_END
2874
2875
2876 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2877 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2878 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2879 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2880 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2881 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2882 switch (cp->tag_at(cp_index).value()) {
2883 case JVM_CONSTANT_Methodref:
2884 case JVM_CONSTANT_InterfaceMethodref: {
2885 Symbol* name = cp->uncached_name_ref_at(cp_index);
2886 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2887 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2888 int methods_count = methods->length();
2889 for (int i = 0; i < methods_count; i++) {
2890 Method* method = methods->at(i);
2891 if (method->name() == name && method->signature() == signature) {
2892 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2893 }
2894 }
2895 return -1;
2896 }
2897 default:
2898 fatal("JVM_GetCPMethodModifiers: illegal constant");
2899 }
2900 ShouldNotReachHere();
2901 return 0;
2902 JVM_END
2903
2904
2905 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2906
2907 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2908 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2909 JVM_END
2910
2911
2912 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2913 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2914 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2915 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2916 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2917 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2918 JVM_END
2919
2920 // Printing support //////////////////////////////////////////////////
2921 extern "C" {
2922
2923 ATTRIBUTE_PRINTF(3, 0)
2924 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2925 // Reject count values that are negative signed values converted to
2926 // unsigned; see bug 4399518, 4417214
2927 if ((intptr_t)count <= 0) return -1;
2928
2929 int result = os::vsnprintf(str, count, fmt, args);
2930 if (result > 0 && (size_t)result >= count) {
2931 result = -1;
2932 }
2933
2934 return result;
2935 }
2936
2937 ATTRIBUTE_PRINTF(3, 4)
2938 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2939 va_list args;
2940 int len;
2941 va_start(args, fmt);
2942 len = jio_vsnprintf(str, count, fmt, args);
2943 va_end(args);
2944 return len;
2945 }
2946
2947 ATTRIBUTE_PRINTF(2, 3)
2948 int jio_fprintf(FILE* f, const char *fmt, ...) {
2949 int len;
2950 va_list args;
2951 va_start(args, fmt);
2952 len = jio_vfprintf(f, fmt, args);
2953 va_end(args);
2954 return len;
2955 }
2956
2957 ATTRIBUTE_PRINTF(2, 0)
2958 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2959 if (Arguments::vfprintf_hook() != nullptr) {
2960 return Arguments::vfprintf_hook()(f, fmt, args);
2961 } else {
2962 return vfprintf(f, fmt, args);
2963 }
2964 }
2965
2966 ATTRIBUTE_PRINTF(1, 2)
2967 JNIEXPORT int jio_printf(const char *fmt, ...) {
2968 int len;
2969 va_list args;
2970 va_start(args, fmt);
2971 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2972 va_end(args);
2973 return len;
2974 }
2975
2976 // HotSpot specific jio method
2977 void jio_print(const char* s, size_t len) {
2978 // Try to make this function as atomic as possible.
2979 if (Arguments::vfprintf_hook() != nullptr) {
2980 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2981 } else {
2982 // Make an unused local variable to avoid warning from gcc compiler.
2983 bool dummy = os::write(defaultStream::output_fd(), s, len);
2984 }
2985 }
2986
2987 } // Extern C
2988
2989 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2990
2991 // In most of the JVM thread support functions we need to access the
2992 // thread through a ThreadsListHandle to prevent it from exiting and
2993 // being reclaimed while we try to operate on it. The exceptions to this
2994 // rule are when operating on the current thread, or if the monitor of
2995 // the target java.lang.Thread is locked at the Java level - in both
2996 // cases the target cannot exit.
2997
2998 static void thread_entry(JavaThread* thread, TRAPS) {
2999 HandleMark hm(THREAD);
3000 Handle obj(THREAD, thread->threadObj());
3001 JavaValue result(T_VOID);
3002 JavaCalls::call_virtual(&result,
3003 obj,
3004 vmClasses::Thread_klass(),
3005 vmSymbols::run_method_name(),
3006 vmSymbols::void_method_signature(),
3007 THREAD);
3008 }
3009
3010
3011 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3012 #if INCLUDE_CDS
3013 if (DumpSharedSpaces) {
3014 // During java -Xshare:dump, if we allow multiple Java threads to
3015 // execute in parallel, symbols and classes may be loaded in
3016 // random orders which will make the resulting CDS archive
3017 // non-deterministic.
3018 //
3019 // Lucikly, during java -Xshare:dump, it's important to run only
3020 // the code in the main Java thread (which is NOT started here) that
3021 // creates the module graph, etc. It's safe to not start the other
3022 // threads which are launched by class static initializers
3023 // (ReferenceHandler, FinalizerThread and CleanerImpl).
3024 if (log_is_enabled(Info, cds)) {
3025 ResourceMark rm;
3026 oop t = JNIHandles::resolve_non_null(jthread);
3027 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
3028 }
3029 return;
3030 }
3031 #endif
3032 JavaThread *native_thread = nullptr;
3033
3034 // We cannot hold the Threads_lock when we throw an exception,
3035 // due to rank ordering issues. Example: we might need to grab the
3036 // Heap_lock while we construct the exception.
3037 bool throw_illegal_thread_state = false;
3038
3039 // We must release the Threads_lock before we can post a jvmti event
3040 // in Thread::start.
3041 {
3042 // Ensure that the C++ Thread and OSThread structures aren't freed before
3043 // we operate.
3044 MutexLocker mu(Threads_lock);
3045
3046 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3047 // re-starting an already started thread, so we should usually find
3048 // that the JavaThread is null. However for a JNI attached thread
3049 // there is a small window between the Thread object being created
3050 // (with its JavaThread set) and the update to its threadStatus, so we
3051 // have to check for this
3052 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
3053 throw_illegal_thread_state = true;
3054 } else {
3055 jlong size =
3056 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3057 // Allocate the C++ Thread structure and create the native thread. The
3058 // stack size retrieved from java is 64-bit signed, but the constructor takes
3059 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3060 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3061 // - Avoid passing negative values which would result in really large stacks.
3062 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3063 size_t sz = size > 0 ? (size_t) size : 0;
3064 native_thread = new JavaThread(&thread_entry, sz);
3065
3066 // At this point it may be possible that no osthread was created for the
3067 // JavaThread due to lack of memory. Check for this situation and throw
3068 // an exception if necessary. Eventually we may want to change this so
3069 // that we only grab the lock if the thread was created successfully -
3070 // then we can also do this check and throw the exception in the
3071 // JavaThread constructor.
3072 if (native_thread->osthread() != nullptr) {
3073 // Note: the current thread is not being used within "prepare".
3074 native_thread->prepare(jthread);
3075 }
3076 }
3077 }
3078
3079 if (throw_illegal_thread_state) {
3080 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3081 }
3082
3083 assert(native_thread != nullptr, "Starting null thread?");
3084
3085 if (native_thread->osthread() == nullptr) {
3086 ResourceMark rm(thread);
3087 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3088 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3089 // No one should hold a reference to the 'native_thread'.
3090 native_thread->smr_delete();
3091 if (JvmtiExport::should_post_resource_exhausted()) {
3092 JvmtiExport::post_resource_exhausted(
3093 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3094 os::native_thread_creation_failed_msg());
3095 }
3096 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3097 os::native_thread_creation_failed_msg());
3098 }
3099
3100 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3101
3102 Thread::start(native_thread);
3103
3104 JVM_END
3105
3106
3107 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3108 ThreadsListHandle tlh(thread);
3109 oop java_thread = nullptr;
3110 JavaThread* receiver = nullptr;
3111 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3112 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3113
3114 if (is_alive) {
3115 // jthread refers to a live JavaThread.
3116 Thread::set_priority(receiver, (ThreadPriority)prio);
3117 }
3118 // Implied else: If the JavaThread hasn't started yet, then the
3119 // priority set in the java.lang.Thread object above will be pushed
3120 // down when it does start.
3121 JVM_END
3122
3123
3124 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3125 if (os::dont_yield()) return;
3126 HOTSPOT_THREAD_YIELD();
3127 os::naked_yield();
3128 JVM_END
3129
3130 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3131 if (nanos < 0) {
3132 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3133 }
3134
3135 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3136 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3137 }
3138
3139 // Save current thread state and restore it at the end of this block.
3140 // And set new thread state to SLEEPING.
3141 JavaThreadSleepState jtss(thread);
3142
3143 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3144
3145 if (nanos == 0) {
3146 os::naked_yield();
3147 } else {
3148 ThreadState old_state = thread->osthread()->get_state();
3149 thread->osthread()->set_state(SLEEPING);
3150 if (!thread->sleep_nanos(nanos)) { // interrupted
3151 // An asynchronous exception could have been thrown on
3152 // us while we were sleeping. We do not overwrite those.
3153 if (!HAS_PENDING_EXCEPTION) {
3154 HOTSPOT_THREAD_SLEEP_END(1);
3155
3156 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3157 // to properly restore the thread state. That's likely wrong.
3158 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3159 }
3160 }
3161 thread->osthread()->set_state(old_state);
3162 }
3163 HOTSPOT_THREAD_SLEEP_END(0);
3164 JVM_END
3165
3166 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3167 oop jthread = thread->threadObj();
3168 assert(jthread != nullptr, "no current carrier thread!");
3169 return JNIHandles::make_local(THREAD, jthread);
3170 JVM_END
3171
3172 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3173 oop theThread = thread->vthread();
3174 assert(theThread != (oop)nullptr, "no current thread!");
3175 return JNIHandles::make_local(THREAD, theThread);
3176 JVM_END
3177
3178 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3179 jobject theThread))
3180 oop threadObj = JNIHandles::resolve(theThread);
3181 thread->set_vthread(threadObj);
3182 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3183 JVM_END
3184
3185 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3186 return ThreadIdentifier::unsafe_offset();
3187 JVM_END
3188
3189 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3190 ThreadsListHandle tlh(thread);
3191 JavaThread* receiver = nullptr;
3192 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3193 if (is_alive) {
3194 // jthread refers to a live JavaThread.
3195 receiver->interrupt();
3196 }
3197 JVM_END
3198
3199 // Return true iff the current thread has locked the object passed in
3200
3201 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3202 if (obj == nullptr) {
3203 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3204 }
3205 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3206 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3207 JVM_END
3208
3209 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3210 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3211 return JNIHandles::make_local(THREAD, trace);
3212 JVM_END
3213
3214 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3215 VM_PrintThreads op;
3216 VMThread::execute(&op);
3217 if (JvmtiExport::should_post_data_dump()) {
3218 JvmtiExport::post_data_dump();
3219 }
3220 JVM_END
3221
3222 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3223 // We don't use a ThreadsListHandle here because the current thread
3224 // must be alive.
3225 oop java_thread = JNIHandles::resolve_non_null(jthread);
3226 JavaThread* thr = java_lang_Thread::thread(java_thread);
3227 if (thread == thr && !thr->has_attached_via_jni()) {
3228 // Thread naming is only supported for the current thread and
3229 // we don't set the name of an attached thread to avoid stepping
3230 // on other programs.
3231 ResourceMark rm(thread);
3232 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3233 os::set_native_thread_name(thread_name);
3234 }
3235 JVM_END
3236
3237 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3238 oop theCache = thread->scopedValueCache();
3239 return JNIHandles::make_local(THREAD, theCache);
3240 JVM_END
3241
3242 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3243 jobject theCache))
3244 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3245 thread->set_scopedValueCache(objs);
3246 JVM_END
3247
3248 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3249
3250 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3251 ResourceMark rm(THREAD);
3252 JvmtiVMObjectAllocEventCollector oam;
3253 vframeStream vfst(thread);
3254
3255 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3256 // This must only be called from SecurityManager.getClassContext
3257 Method* m = vfst.method();
3258 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3259 m->name() == vmSymbols::getClassContext_name() &&
3260 m->signature() == vmSymbols::void_class_array_signature())) {
3261 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3262 }
3263 }
3264
3265 // Collect method holders
3266 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3267 for (; !vfst.at_end(); vfst.security_next()) {
3268 Method* m = vfst.method();
3269 // Native frames are not returned
3270 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3271 Klass* holder = m->method_holder();
3272 assert(holder->is_klass(), "just checking");
3273 klass_array->append(holder);
3274 }
3275 }
3276
3277 // Create result array of type [Ljava/lang/Class;
3278 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3279 // Fill in mirrors corresponding to method holders
3280 for (int i = 0; i < klass_array->length(); i++) {
3281 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3282 }
3283
3284 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3285 JVM_END
3286
3287
3288 // java.lang.Package ////////////////////////////////////////////////////////////////
3289
3290
3291 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3292 ResourceMark rm(THREAD);
3293 JvmtiVMObjectAllocEventCollector oam;
3294 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3295 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3296 return (jstring) JNIHandles::make_local(THREAD, result);
3297 JVM_END
3298
3299
3300 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3301 JvmtiVMObjectAllocEventCollector oam;
3302 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3303 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3304 JVM_END
3305
3306
3307 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3308
3309
3310 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3311 MonitorLocker ml(Heap_lock);
3312 oop ref = Universe::reference_pending_list();
3313 if (ref != nullptr) {
3314 Universe::clear_reference_pending_list();
3315 }
3316 return JNIHandles::make_local(THREAD, ref);
3317 JVM_END
3318
3319 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3320 MonitorLocker ml(Heap_lock);
3321 return Universe::has_reference_pending_list();
3322 JVM_END
3323
3324 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3325 MonitorLocker ml(Heap_lock);
3326 while (!Universe::has_reference_pending_list()) {
3327 ml.wait();
3328 }
3329 JVM_END
3330
3331 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3332 oop ref_oop = JNIHandles::resolve_non_null(ref);
3333 // PhantomReference has it's own implementation of refersTo().
3334 // See: JVM_PhantomReferenceRefersTo
3335 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3336 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3337 return referent == JNIHandles::resolve(o);
3338 JVM_END
3339
3340 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3341 oop ref_oop = JNIHandles::resolve_non_null(ref);
3342 // FinalReference has it's own implementation of clear().
3343 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3344 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3345 // If the referent has already been cleared then done.
3346 // However, if the referent is dead but has not yet been cleared by
3347 // concurrent reference processing, it should NOT be cleared here.
3348 // Instead, clearing should be left to the GC. Clearing it here could
3349 // detectably lose an expected notification, which is impossible with
3350 // STW reference processing. The clearing in enqueue() doesn't have
3351 // this problem, since the enqueue covers the notification, but it's not
3352 // worth the effort to handle that case specially.
3353 return;
3354 }
3355 java_lang_ref_Reference::clear_referent(ref_oop);
3356 JVM_END
3357
3358
3359 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3360
3361
3362 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3363 oop ref_oop = JNIHandles::resolve_non_null(ref);
3364 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3365 return referent == JNIHandles::resolve(o);
3366 JVM_END
3367
3368
3369 // ObjectInputStream ///////////////////////////////////////////////////////////////
3370
3371 // Return the first user-defined class loader up the execution stack, or null
3372 // if only code from the bootstrap or platform class loader is on the stack.
3373
3374 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3375 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3376 InstanceKlass* ik = vfst.method()->method_holder();
3377 oop loader = ik->class_loader();
3378 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3379 // Skip reflection related frames
3380 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
3381 return JNIHandles::make_local(THREAD, loader);
3382 }
3383 }
3384 }
3385 return nullptr;
3386 JVM_END
3387
3388
3389 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3390
3391
3392 // resolve array handle and check arguments
3393 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3394 if (arr == nullptr) {
3395 THROW_0(vmSymbols::java_lang_NullPointerException());
3396 }
3397 oop a = JNIHandles::resolve_non_null(arr);
3398 if (!a->is_array()) {
3399 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3400 } else if (type_array_only && !a->is_typeArray()) {
3401 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3402 }
3403 return arrayOop(a);
3404 }
3405
3406
3407 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3408 arrayOop a = check_array(env, arr, false, CHECK_0);
3409 return a->length();
3410 JVM_END
3411
3412
3413 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3414 JvmtiVMObjectAllocEventCollector oam;
3415 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3416 jvalue value;
3417 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3418 oop box = Reflection::box(&value, type, CHECK_NULL);
3419 return JNIHandles::make_local(THREAD, box);
3420 JVM_END
3421
3422
3423 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3424 jvalue value;
3425 value.i = 0; // to initialize value before getting used in CHECK
3426 arrayOop a = check_array(env, arr, true, CHECK_(value));
3427 assert(a->is_typeArray(), "just checking");
3428 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3429 BasicType wide_type = (BasicType) wCode;
3430 if (type != wide_type) {
3431 Reflection::widen(&value, type, wide_type, CHECK_(value));
3432 }
3433 return value;
3434 JVM_END
3435
3436
3437 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3438 arrayOop a = check_array(env, arr, false, CHECK);
3439 oop box = JNIHandles::resolve(val);
3440 jvalue value;
3441 value.i = 0; // to initialize value before getting used in CHECK
3442 BasicType value_type;
3443 if (a->is_objArray()) {
3444 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3445 value_type = Reflection::unbox_for_regular_object(box, &value);
3446 } else {
3447 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3448 }
3449 Reflection::array_set(&value, a, index, value_type, CHECK);
3450 JVM_END
3451
3452
3453 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3454 arrayOop a = check_array(env, arr, true, CHECK);
3455 assert(a->is_typeArray(), "just checking");
3456 BasicType value_type = (BasicType) vCode;
3457 Reflection::array_set(&v, a, index, value_type, CHECK);
3458 JVM_END
3459
3460
3461 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3462 JvmtiVMObjectAllocEventCollector oam;
3463 oop element_mirror = JNIHandles::resolve(eltClass);
3464 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3465 return JNIHandles::make_local(THREAD, result);
3466 JVM_END
3467
3468
3469 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3470 JvmtiVMObjectAllocEventCollector oam;
3471 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3472 oop element_mirror = JNIHandles::resolve(eltClass);
3473 assert(dim_array->is_typeArray(), "just checking");
3474 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3475 return JNIHandles::make_local(THREAD, result);
3476 JVM_END
3477
3478
3479 // Library support ///////////////////////////////////////////////////////////////////////////
3480
3481 JVM_LEAF(void*, JVM_LoadZipLibrary())
3482 ClassLoader::load_zip_library_if_needed();
3483 return ClassLoader::zip_library_handle();
3484 JVM_END
3485
3486 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3487 //%note jvm_ct
3488 char ebuf[1024];
3489 void *load_result;
3490 {
3491 ThreadToNativeFromVM ttnfvm(thread);
3492 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3493 }
3494 if (load_result == nullptr) {
3495 if (throwException) {
3496 char msg[1024];
3497 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3498 // Since 'ebuf' may contain a string encoded using
3499 // platform encoding scheme, we need to pass
3500 // Exceptions::unsafe_to_utf8 to the new_exception method
3501 // as the last argument. See bug 6367357.
3502 Handle h_exception =
3503 Exceptions::new_exception(thread,
3504 vmSymbols::java_lang_UnsatisfiedLinkError(),
3505 msg, Exceptions::unsafe_to_utf8);
3506
3507 THROW_HANDLE_0(h_exception);
3508 } else {
3509 log_info(library)("Failed to load library %s", name);
3510 return load_result;
3511 }
3512 }
3513 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3514 return load_result;
3515 JVM_END
3516
3517
3518 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3519 os::dll_unload(handle);
3520 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3521 JVM_END
3522
3523
3524 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3525 void* find_result = os::dll_lookup(handle, name);
3526 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3527 find_result != nullptr ? "Found" : "Failed to find",
3528 name, p2i(handle));
3529 return find_result;
3530 JVM_END
3531
3532
3533 // JNI version ///////////////////////////////////////////////////////////////////////////////
3534
3535 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3536 return Threads::is_supported_jni_version_including_1_1(version);
3537 JVM_END
3538
3539
3540 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3541 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3542 JVM_END
3543
3544 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3545 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3546 JVM_END
3547
3548 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3549 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3550 JVM_END
3551
3552 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3553 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3554 JVM_END
3555
3556 // String support ///////////////////////////////////////////////////////////////////////////
3557
3558 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3559 JvmtiVMObjectAllocEventCollector oam;
3560 if (str == nullptr) return nullptr;
3561 oop string = JNIHandles::resolve_non_null(str);
3562 oop result = StringTable::intern(string, CHECK_NULL);
3563 return (jstring) JNIHandles::make_local(THREAD, result);
3564 JVM_END
3565
3566
3567 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3568
3569 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3570 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3571 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3572 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3573 // nature. JavaThreads will be "in native" when using this API from JDK code.
3574
3575
3576 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3577 VM_Exit::block_if_vm_exited();
3578 return new PlatformMutex();
3579 }
3580
3581
3582 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3583 VM_Exit::block_if_vm_exited();
3584 delete ((PlatformMutex*) mon);
3585 }
3586
3587
3588 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3589 VM_Exit::block_if_vm_exited();
3590 ((PlatformMutex*) mon)->lock();
3591 return 0;
3592 }
3593
3594
3595 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3596 VM_Exit::block_if_vm_exited();
3597 ((PlatformMutex*) mon)->unlock();
3598 }
3599
3600
3601 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3602
3603 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3604 Handle loader, Handle protection_domain,
3605 jboolean throwError, TRAPS) {
3606 // Security Note:
3607 // The Java level wrapper will perform the necessary security check allowing
3608 // us to pass the null as the initiating class loader. The VM is responsible for
3609 // the checkPackageAccess relative to the initiating class loader via the
3610 // protection_domain. The protection_domain is passed as null by the java code
3611 // if there is no security manager in 3-arg Class.forName().
3612 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3613
3614 // Check if we should initialize the class
3615 if (init && klass->is_instance_klass()) {
3616 klass->initialize(CHECK_NULL);
3617 }
3618 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3619 }
3620
3621
3622 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3623
3624 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3625 Handle method_handle;
3626 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3627 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3628 Handle receiver(THREAD, JNIHandles::resolve(obj));
3629 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3630 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3631 jobject res = JNIHandles::make_local(THREAD, result);
3632 if (JvmtiExport::should_post_vm_object_alloc()) {
3633 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3634 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3635 if (java_lang_Class::is_primitive(ret_type)) {
3636 // Only for primitive type vm allocates memory for java object.
3637 // See box() method.
3638 JvmtiExport::post_vm_object_alloc(thread, result);
3639 }
3640 }
3641 return res;
3642 } else {
3643 THROW_0(vmSymbols::java_lang_StackOverflowError());
3644 }
3645 JVM_END
3646
3647
3648 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3649 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3650 oop constructor_mirror = JNIHandles::resolve(c);
3651 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3652 jobject res = JNIHandles::make_local(THREAD, result);
3653 if (JvmtiExport::should_post_vm_object_alloc()) {
3654 JvmtiExport::post_vm_object_alloc(thread, result);
3655 }
3656 return res;
3657 JVM_END
3658
3659 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3660
3661 JVM_LEAF(jboolean, JVM_SupportsCX8())
3662 return VM_Version::supports_cx8();
3663 JVM_END
3664
3665 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3667 assert(k->is_klass(), "just checking");
3668 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3669 JVM_END
3670
3671 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3672 jclass caller,
3673 jstring interfaceMethodName,
3674 jobject factoryType,
3675 jobject interfaceMethodType,
3676 jobject implementationMember,
3677 jobject dynamicMethodType,
3678 jclass lambdaProxyClass))
3679 #if INCLUDE_CDS
3680 if (!Arguments::is_dumping_archive()) {
3681 return;
3682 }
3683
3684 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3685 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3686 if (caller_ik->is_hidden()) {
3687 // Hidden classes not of type lambda proxy classes are currently not being archived.
3688 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3689 // registered for archiving.
3690 return;
3691 }
3692 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3693 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3694 assert(lambda_ik->is_hidden(), "must be a hidden class");
3695 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3696
3697 Symbol* interface_method_name = nullptr;
3698 if (interfaceMethodName != nullptr) {
3699 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3700 }
3701 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3702 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3703
3704 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3705 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3706
3707 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3708 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3709 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3710
3711 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3712 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3713
3714 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3715 interface_method_type, m, dynamic_method_type, THREAD);
3716 #endif // INCLUDE_CDS
3717 JVM_END
3718
3719 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3720 jclass caller,
3721 jstring interfaceMethodName,
3722 jobject factoryType,
3723 jobject interfaceMethodType,
3724 jobject implementationMember,
3725 jobject dynamicMethodType))
3726 #if INCLUDE_CDS
3727
3728 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3729 implementationMember == nullptr || dynamicMethodType == nullptr) {
3730 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3731 }
3732
3733 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3734 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3735 if (!caller_ik->is_shared()) {
3736 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3737 return nullptr;
3738 }
3739
3740 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3741 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3742 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3743
3744 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3745 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3746
3747 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3748 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3749 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3750
3751 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3752 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3753
3754 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3755 interface_method_type, m, dynamic_method_type);
3756 jclass jcls = nullptr;
3757 if (lambda_ik != nullptr) {
3758 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3759 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3760 }
3761 return jcls;
3762 #else
3763 return nullptr;
3764 #endif // INCLUDE_CDS
3765 JVM_END
3766
3767 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3768 return Arguments::is_dumping_archive();
3769 JVM_END
3770
3771 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3772 return UseSharedSpaces;
3773 JVM_END
3774
3775 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3776 if (DumpSharedSpaces) {
3777 const char* release = VM_Version::vm_release();
3778 const char* dbg_level = VM_Version::jdk_debug_level();
3779 const char* version = VM_Version::internal_vm_info_string();
3780 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3781 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3782 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3783 seed += (jlong)VM_Version::vm_major_version();
3784 seed += (jlong)VM_Version::vm_minor_version();
3785 seed += (jlong)VM_Version::vm_security_version();
3786 seed += (jlong)VM_Version::vm_patch_version();
3787 if (seed == 0) { // don't let this ever be zero.
3788 seed = 0x87654321;
3789 }
3790 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3791 return seed;
3792 } else {
3793 return 0;
3794 }
3795 JVM_END
3796
3797 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3798 #if INCLUDE_CDS
3799 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3800 #else
3801 return false;
3802 #endif // INCLUDE_CDS
3803 JVM_END
3804
3805 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3806 #if INCLUDE_CDS
3807 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3808 if (line != nullptr) {
3809 ResourceMark rm(THREAD);
3810 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3811 char* c_line = java_lang_String::as_utf8_string(h_line());
3812 if (DynamicDumpSharedSpaces) {
3813 // Note: LambdaFormInvokers::append take same format which is not
3814 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3815 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3816 }
3817 if (ClassListWriter::is_enabled()) {
3818 ClassListWriter w;
3819 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3820 }
3821 }
3822 #endif // INCLUDE_CDS
3823 JVM_END
3824
3825 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3826 #if INCLUDE_CDS
3827 ResourceMark rm(THREAD);
3828 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3829 char* file_name = java_lang_String::as_utf8_string(file_handle());
3830 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3831 #endif // INCLUDE_CDS
3832 JVM_END
3833
3834 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3835 #if INCLUDE_CDS
3836 ResourceMark rm(THREAD);
3837 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3838 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3839 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3840 #endif // INCLUDE_CDS
3841 JVM_END
3842
3843 // Returns an array of all live Thread objects (VM internal JavaThreads,
3844 // jvmti agent threads, and JNI attaching threads are skipped)
3845 // See CR 6404306 regarding JNI attaching threads
3846 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3847 ResourceMark rm(THREAD);
3848 ThreadsListEnumerator tle(THREAD, false, false);
3849 JvmtiVMObjectAllocEventCollector oam;
3850
3851 int num_threads = tle.num_threads();
3852 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3853 objArrayHandle threads_ah(THREAD, r);
3854
3855 for (int i = 0; i < num_threads; i++) {
3856 Handle h = tle.get_threadObj(i);
3857 threads_ah->obj_at_put(i, h());
3858 }
3859
3860 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3861 JVM_END
3862
3863
3864 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3865 // Return StackTraceElement[][], each element is the stack trace of a thread in
3866 // the corresponding entry in the given threads array
3867 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3868 JvmtiVMObjectAllocEventCollector oam;
3869
3870 // Check if threads is null
3871 if (threads == nullptr) {
3872 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3873 }
3874
3875 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3876 objArrayHandle ah(THREAD, a);
3877 int num_threads = ah->length();
3878 // check if threads is non-empty array
3879 if (num_threads == 0) {
3880 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3881 }
3882
3883 // check if threads is not an array of objects of Thread class
3884 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3885 if (k != vmClasses::Thread_klass()) {
3886 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3887 }
3888
3889 ResourceMark rm(THREAD);
3890
3891 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3892 for (int i = 0; i < num_threads; i++) {
3893 oop thread_obj = ah->obj_at(i);
3894 instanceHandle h(THREAD, (instanceOop) thread_obj);
3895 thread_handle_array->append(h);
3896 }
3897
3898 // The JavaThread references in thread_handle_array are validated
3899 // in VM_ThreadDump::doit().
3900 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3901 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3902
3903 JVM_END
3904
3905 // JVM monitoring and management support
3906 JVM_LEAF(void*, JVM_GetManagement(jint version))
3907 return Management::get_jmm_interface(version);
3908 JVM_END
3909
3910 // com.sun.tools.attach.VirtualMachine agent properties support
3911 //
3912 // Initialize the agent properties with the properties maintained in the VM
3913 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3914 ResourceMark rm;
3915
3916 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3917
3918 PUTPROP(props, "sun.java.command", Arguments::java_command());
3919 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3920 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3921 return properties;
3922 JVM_END
3923
3924 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3925 {
3926 JvmtiVMObjectAllocEventCollector oam;
3927
3928 if (ofClass == nullptr) {
3929 return nullptr;
3930 }
3931 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3932 // Special handling for primitive objects
3933 if (java_lang_Class::is_primitive(mirror())) {
3934 return nullptr;
3935 }
3936 Klass* k = java_lang_Class::as_Klass(mirror());
3937 if (!k->is_instance_klass()) {
3938 return nullptr;
3939 }
3940 InstanceKlass* ik = InstanceKlass::cast(k);
3941 int encl_method_class_idx = ik->enclosing_method_class_index();
3942 if (encl_method_class_idx == 0) {
3943 return nullptr;
3944 }
3945 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3946 objArrayHandle dest(THREAD, dest_o);
3947 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3948 dest->obj_at_put(0, enc_k->java_mirror());
3949 int encl_method_method_idx = ik->enclosing_method_method_index();
3950 if (encl_method_method_idx != 0) {
3951 Symbol* sym = ik->constants()->symbol_at(
3952 extract_low_short_from_int(
3953 ik->constants()->name_and_type_at(encl_method_method_idx)));
3954 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3955 dest->obj_at_put(1, str());
3956 sym = ik->constants()->symbol_at(
3957 extract_high_short_from_int(
3958 ik->constants()->name_and_type_at(encl_method_method_idx)));
3959 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3960 dest->obj_at_put(2, str());
3961 }
3962 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3963 }
3964 JVM_END
3965
3966 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3967 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3968 ResourceMark rm(THREAD);
3969
3970 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3971 return nullptr;
3972 }
3973
3974 char** vm_flags = Arguments::jvm_flags_array();
3975 char** vm_args = Arguments::jvm_args_array();
3976 int num_flags = Arguments::num_jvm_flags();
3977 int num_args = Arguments::num_jvm_args();
3978
3979 InstanceKlass* ik = vmClasses::String_klass();
3980 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3981 objArrayHandle result_h(THREAD, r);
3982
3983 int index = 0;
3984 for (int j = 0; j < num_flags; j++, index++) {
3985 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3986 result_h->obj_at_put(index, h());
3987 }
3988 for (int i = 0; i < num_args; i++, index++) {
3989 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3990 result_h->obj_at_put(index, h());
3991 }
3992 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3993 JVM_END
3994
3995 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3996 return os::get_signal_number(name);
3997 JVM_END
3998
3999 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
4000 #if INCLUDE_JVMTI
4001 if (!DoJVMTIVirtualThreadTransitions) {
4002 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4003 return;
4004 }
4005 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4006 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
4007 } else {
4008 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4009 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
4010 }
4011 #else
4012 fatal("Should only be called with JVMTI enabled");
4013 #endif
4014 JVM_END
4015
4016 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
4017 #if INCLUDE_JVMTI
4018 if (!DoJVMTIVirtualThreadTransitions) {
4019 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4020 return;
4021 }
4022 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4023 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
4024 } else {
4025 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4026 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
4027 }
4028 #else
4029 fatal("Should only be called with JVMTI enabled");
4030 #endif
4031 JVM_END
4032
4033 // If notifications are disabled then just update the VTMS transition bit and return.
4034 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
4035 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
4036 #if INCLUDE_JVMTI
4037 if (!DoJVMTIVirtualThreadTransitions) {
4038 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4039 return;
4040 }
4041 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4042 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
4043 } else {
4044 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4045 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4046 }
4047 #else
4048 fatal("Should only be called with JVMTI enabled");
4049 #endif
4050 JVM_END
4051
4052 // If notifications are disabled then just update the VTMS transition bit and return.
4053 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
4054 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
4055 #if INCLUDE_JVMTI
4056 if (!DoJVMTIVirtualThreadTransitions) {
4057 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4058 return;
4059 }
4060 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4061 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
4062 } else {
4063 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4064 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4065 }
4066 #else
4067 fatal("Should only be called with JVMTI enabled");
4068 #endif
4069 JVM_END
4070
4071 // Always update the temporary VTMS transition bit.
4072 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
4073 #if INCLUDE_JVMTI
4074 if (!DoJVMTIVirtualThreadTransitions) {
4075 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4076 return;
4077 }
4078 assert(!thread->is_in_VTMS_transition(), "sanity check");
4079 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
4080 thread->toggle_is_in_tmp_VTMS_transition();
4081 #else
4082 fatal("Should only be called with JVMTI enabled");
4083 #endif
4084 JVM_END
4085
4086 /*
4087 * Return the current class's class file version. The low order 16 bits of the
4088 * returned jint contain the class's major version. The high order 16 bits
4089 * contain the class's minor version.
4090 */
4091 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4092 oop mirror = JNIHandles::resolve_non_null(current);
4093 if (java_lang_Class::is_primitive(mirror)) {
4094 // return latest major version and minor version of 0.
4095 return JVM_CLASSFILE_MAJOR_VERSION;
4096 }
4097 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4098
4099 Klass* c = java_lang_Class::as_Klass(mirror);
4100 assert(c->is_instance_klass(), "must be");
4101 InstanceKlass* ik = InstanceKlass::cast(c);
4102 return (ik->minor_version() << 16) | ik->major_version();
4103 JVM_END
4104
4105 /*
4106 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4107 * get the value will see a materialized value and not a scalar-replaced
4108 * null value.
4109 */
4110 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4111 JVM_EnsureMaterializedForStackWalk(env, value);
4112 JVM_END
4113
4114 /*
4115 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4116 */
4117 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4118 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4119 JVM_END