1 /*
2 * Copyright (c) 1997, 2024, 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/cdsConfig.hpp"
27 #include "cds/classListParser.hpp"
28 #include "cds/classListWriter.hpp"
29 #include "cds/dynamicArchive.hpp"
30 #include "cds/heapShared.hpp"
31 #include "cds/lambdaFormInvokers.hpp"
32 #include "classfile/classFileStream.hpp"
33 #include "classfile/classLoader.inline.hpp"
34 #include "classfile/classLoaderData.hpp"
35 #include "classfile/classLoaderData.inline.hpp"
36 #include "classfile/classLoadInfo.hpp"
37 #include "classfile/javaAssertions.hpp"
38 #include "classfile/javaClasses.inline.hpp"
39 #include "classfile/moduleEntry.hpp"
40 #include "classfile/modules.hpp"
41 #include "classfile/packageEntry.hpp"
42 #include "classfile/stringTable.hpp"
43 #include "classfile/symbolTable.hpp"
44 #include "classfile/systemDictionary.hpp"
45 #include "classfile/vmClasses.hpp"
46 #include "classfile/vmSymbols.hpp"
47 #include "gc/shared/collectedHeap.inline.hpp"
48 #include "interpreter/bytecode.hpp"
49 #include "interpreter/bytecodeUtils.hpp"
50 #include "jfr/jfrEvents.hpp"
51 #include "jvm.h"
52 #include "logging/log.hpp"
53 #include "memory/oopFactory.hpp"
54 #include "memory/referenceType.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/access.inline.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/fieldStreams.inline.hpp"
60 #include "oops/flatArrayKlass.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/method.hpp"
64 #include "oops/recordComponent.hpp"
65 #include "oops/objArrayKlass.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/oop.inline.hpp"
68 #include "prims/foreignGlobals.hpp"
69 #include "prims/jvm_misc.hpp"
70 #include "prims/jvmtiExport.hpp"
71 #include "prims/jvmtiThreadState.inline.hpp"
72 #include "prims/stackwalk.hpp"
73 #include "runtime/arguments.hpp"
74 #include "runtime/atomic.hpp"
75 #include "runtime/continuation.hpp"
76 #include "runtime/globals_extension.hpp"
77 #include "runtime/handles.inline.hpp"
78 #include "runtime/init.hpp"
79 #include "runtime/interfaceSupport.inline.hpp"
80 #include "runtime/deoptimization.hpp"
81 #include "runtime/handshake.hpp"
82 #include "runtime/java.hpp"
83 #include "runtime/javaCalls.hpp"
84 #include "runtime/javaThread.hpp"
85 #include "runtime/jfieldIDWorkaround.hpp"
86 #include "runtime/jniHandles.inline.hpp"
87 #include "runtime/os.inline.hpp"
88 #include "runtime/osThread.hpp"
89 #include "runtime/perfData.hpp"
90 #include "runtime/reflection.hpp"
91 #include "runtime/synchronizer.hpp"
92 #include "runtime/threadIdentifier.hpp"
93 #include "runtime/threadSMR.hpp"
94 #include "runtime/vframe.inline.hpp"
95 #include "runtime/vmOperations.hpp"
96 #include "runtime/vm_version.hpp"
97 #include "services/attachListener.hpp"
98 #include "services/management.hpp"
99 #include "services/threadService.hpp"
100 #include "utilities/checkedCast.hpp"
101 #include "utilities/copy.hpp"
102 #include "utilities/defaultStream.hpp"
103 #include "utilities/dtrace.hpp"
104 #include "utilities/events.hpp"
105 #include "utilities/macros.hpp"
106 #include "utilities/utf8.hpp"
107 #include "utilities/zipLibrary.hpp"
108 #if INCLUDE_CDS
109 #include "classfile/systemDictionaryShared.hpp"
110 #endif
111 #if INCLUDE_JFR
112 #include "jfr/jfr.hpp"
113 #endif
114 #if INCLUDE_MANAGEMENT
115 #include "services/finalizerService.hpp"
116 #endif
117
118 #include <errno.h>
119
120 /*
121 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
122 such ctors and calls MUST NOT come between an oop declaration/init and its
123 usage because if objects are move this may cause various memory stomps, bus
124 errors and segfaults. Here is a cookbook for causing so called "naked oop
125 failures":
126
127 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
128 // Object address to be held directly in mirror & not visible to GC
129 oop mirror = JNIHandles::resolve_non_null(ofClass);
130
131 // If this ctor can hit a safepoint, moving objects around, then
132 ComplexConstructor foo;
133
134 // Boom! mirror may point to JUNK instead of the intended object
135 (some dereference of mirror)
136
137 // Here's another call that may block for GC, making mirror stale
138 MutexLocker ml(some_lock);
139
140 // And here's an initializer that can result in a stale oop
141 // all in one step.
142 oop o = call_that_can_throw_exception(TRAPS);
143
144
145 The solution is to keep the oop declaration BELOW the ctor or function
146 call that might cause a GC, do another resolve to reassign the oop, or
147 consider use of a Handle instead of an oop so there is immunity from object
148 motion. But note that the "QUICK" entries below do not have a handlemark
149 and thus can only support use of handles passed in.
150 */
151
152 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
153 ResourceMark rm;
154 int line_number = -1;
155 const char * source_file = nullptr;
156 const char * trace = "explicit";
157 InstanceKlass* caller = nullptr;
158 JavaThread* jthread = THREAD;
159 if (jthread->has_last_Java_frame()) {
160 vframeStream vfst(jthread);
161
162 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
163 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
164 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
165 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
166 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
167
168 Method* last_caller = nullptr;
169
170 while (!vfst.at_end()) {
171 Method* m = vfst.method();
172 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
173 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
174 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
175 break;
176 }
177 last_caller = m;
178 vfst.next();
179 }
180 // if this is called from Class.forName0 and that is called from Class.forName,
181 // then print the caller of Class.forName. If this is Class.loadClass, then print
182 // that caller, otherwise keep quiet since this should be picked up elsewhere.
183 bool found_it = false;
184 if (!vfst.at_end() &&
185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
186 vfst.method()->name() == vmSymbols::forName0_name()) {
187 vfst.next();
188 if (!vfst.at_end() &&
189 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
190 vfst.method()->name() == vmSymbols::forName_name()) {
191 vfst.next();
192 found_it = true;
193 }
194 } else if (last_caller != nullptr &&
195 last_caller->method_holder()->name() ==
196 vmSymbols::java_lang_ClassLoader() &&
197 last_caller->name() == vmSymbols::loadClass_name()) {
198 found_it = true;
199 } else if (!vfst.at_end()) {
200 if (vfst.method()->is_native()) {
201 // JNI call
202 found_it = true;
203 }
204 }
205 if (found_it && !vfst.at_end()) {
206 // found the caller
207 caller = vfst.method()->method_holder();
208 line_number = vfst.method()->line_number_from_bci(vfst.bci());
209 if (line_number == -1) {
210 // show method name if it's a native method
211 trace = vfst.method()->name_and_sig_as_C_string();
212 }
213 Symbol* s = caller->source_file_name();
214 if (s != nullptr) {
215 source_file = s->as_C_string();
216 }
217 }
218 }
219 if (caller != nullptr) {
220 if (to_class != caller) {
221 const char * from = caller->external_name();
222 const char * to = to_class->external_name();
223 // print in a single call to reduce interleaving between threads
224 if (source_file != nullptr) {
225 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
226 } else {
227 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
228 }
229 }
230 }
231 }
232
233 void trace_class_resolution(Klass* to_class) {
234 EXCEPTION_MARK;
235 trace_class_resolution_impl(to_class, THREAD);
236 if (HAS_PENDING_EXCEPTION) {
237 CLEAR_PENDING_EXCEPTION;
238 }
239 }
240
241 // java.lang.System //////////////////////////////////////////////////////////////////////
242
243
244 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
245 return os::javaTimeMillis();
246 JVM_END
247
248 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
249 return os::javaTimeNanos();
250 JVM_END
251
252 // The function below is actually exposed by jdk.internal.misc.VM and not
253 // java.lang.System, but we choose to keep it here so that it stays next
254 // to JVM_CurrentTimeMillis and JVM_NanoTime
255
256 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
257 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
258
259 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
260 jlong seconds;
261 jlong nanos;
262
263 os::javaTimeSystemUTC(seconds, nanos);
264
265 // We're going to verify that the result can fit in a long.
266 // For that we need the difference in seconds between 'seconds'
267 // and 'offset_secs' to be such that:
268 // |seconds - offset_secs| < (2^63/10^9)
269 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
270 // which makes |seconds - offset_secs| < 2^33
271 // and we will prefer +/- 2^32 as the maximum acceptable diff
272 // as 2^32 has a more natural feel than 2^33...
273 //
274 // So if |seconds - offset_secs| >= 2^32 - we return a special
275 // sentinel value (-1) which the caller should take as an
276 // exception value indicating that the offset given to us is
277 // too far from range of the current time - leading to too big
278 // a nano adjustment. The caller is expected to recover by
279 // computing a more accurate offset and calling this method
280 // again. (For the record 2^32 secs is ~136 years, so that
281 // should rarely happen)
282 //
283 jlong diff = seconds - offset_secs;
284 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
285 return -1; // sentinel value: the offset is too far off the target
286 }
287
288 // return the adjustment. If you compute a time by adding
289 // this number of nanoseconds along with the number of seconds
290 // in the offset you should get the current UTC time.
291 return (diff * (jlong)1000000000) + nanos;
292 JVM_END
293
294 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
295 jobject dst, jint dst_pos, jint length))
296 // Check if we have null pointers
297 if (src == nullptr || dst == nullptr) {
298 THROW(vmSymbols::java_lang_NullPointerException());
299 }
300 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
301 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
302 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
303 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
304 // Do copy
305 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
306 JVM_END
307
308
309 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
310 JavaValue r(T_OBJECT);
311 // public synchronized Object put(Object key, Object value);
312 HandleMark hm(THREAD);
313 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
314 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
315 JavaCalls::call_virtual(&r,
316 props,
317 vmClasses::Properties_klass(),
318 vmSymbols::put_name(),
319 vmSymbols::object_object_object_signature(),
320 key_str,
321 value_str,
322 THREAD);
323 }
324
325
326 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
327
328 /*
329 * Return all of the system properties in a Java String array with alternating
330 * names and values from the jvm SystemProperty.
331 * Which includes some internal and all commandline -D defined properties.
332 */
333 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
334 ResourceMark rm(THREAD);
335 HandleMark hm(THREAD);
336 int ndx = 0;
337 int fixedCount = 2;
338
339 SystemProperty* p = Arguments::system_properties();
340 int count = Arguments::PropertyList_count(p);
341
342 // Allocate result String array
343 InstanceKlass* ik = vmClasses::String_klass();
344 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
345 objArrayHandle result_h(THREAD, r);
346
347 while (p != nullptr) {
348 const char * key = p->key();
349 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
350 const char * value = p->value();
351 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
352 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
353 result_h->obj_at_put(ndx * 2, key_str());
354 result_h->obj_at_put(ndx * 2 + 1, value_str());
355 ndx++;
356 }
357 p = p->next();
358 }
359
360 // Convert the -XX:MaxDirectMemorySize= command line flag
361 // to the sun.nio.MaxDirectMemorySize property.
362 // Do this after setting user properties to prevent people
363 // from setting the value with a -D option, as requested.
364 // Leave empty if not supplied
365 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
366 char as_chars[256];
367 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
368 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
369 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
370 result_h->obj_at_put(ndx * 2, key_str());
371 result_h->obj_at_put(ndx * 2 + 1, value_str());
372 ndx++;
373 }
374
375 // JVM monitoring and management support
376 // Add the sun.management.compiler property for the compiler's name
377 {
378 #undef CSIZE
379 #if defined(_LP64) || defined(_WIN64)
380 #define CSIZE "64-Bit "
381 #else
382 #define CSIZE
383 #endif // 64bit
384
385 #if COMPILER1_AND_COMPILER2
386 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
387 #else
388 #if defined(COMPILER1)
389 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
390 #elif defined(COMPILER2)
391 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
392 #elif INCLUDE_JVMCI
393 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
394 #else
395 const char* compiler_name = "";
396 #endif // compilers
397 #endif // COMPILER1_AND_COMPILER2
398
399 if (*compiler_name != '\0' &&
400 (Arguments::mode() != Arguments::_int)) {
401 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
402 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
403 result_h->obj_at_put(ndx * 2, key_str());
404 result_h->obj_at_put(ndx * 2 + 1, value_str());
405 ndx++;
406 }
407 }
408
409 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
410 JVM_END
411
412
413 /*
414 * Return the temporary directory that the VM uses for the attach
415 * and perf data files.
416 *
417 * It is important that this directory is well-known and the
418 * same for all VM instances. It cannot be affected by configuration
419 * variables such as java.io.tmpdir.
420 */
421 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
422 HandleMark hm(THREAD);
423 const char* temp_dir = os::get_temp_directory();
424 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
425 return (jstring) JNIHandles::make_local(THREAD, h());
426 JVM_END
427
428 JVM_ENTRY(jarray, JVM_NewNullRestrictedArray(JNIEnv *env, jclass elmClass, jint len))
429 if (len < 0) {
430 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
431 }
432 oop mirror = JNIHandles::resolve_non_null(elmClass);
433 Klass* klass = java_lang_Class::as_Klass(mirror);
434 klass->initialize(CHECK_NULL);
435 if (klass->is_identity_class()) {
436 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
437 }
438 InstanceKlass* ik = InstanceKlass::cast(klass);
439 if (!ik->is_implicitly_constructible()) {
440 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible");
441 }
442 oop array = oopFactory::new_valueArray(ik, len, CHECK_NULL);
443 return (jarray) JNIHandles::make_local(THREAD, array);
444 JVM_END
445
446
447 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
448 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
449 return oop->is_null_free_array();
450 JVM_END
451
452 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
453
454 extern volatile jint vm_created;
455
456 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
457 EventShutdown event;
458 if (event.should_commit()) {
459 event.set_reason("Shutdown requested from Java");
460 event.commit();
461 }
462 JVM_END
463
464
465 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
466 before_exit(thread, true);
467 vm_exit(code);
468 JVM_END
469
470
471 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
472 if (!DisableExplicitGC) {
473 EventSystemGC event;
474 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
475 Universe::heap()->collect(GCCause::_java_lang_system_gc);
476 event.commit();
477 }
478 JVM_END
479
480
481 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
482 return Universe::heap()->millis_since_last_whole_heap_examined();
483 JVM_END
484
485
486 static inline jlong convert_size_t_to_jlong(size_t val) {
487 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
488 NOT_LP64 (return (jlong)val;)
489 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
490 }
491
492 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
493 size_t n = Universe::heap()->capacity();
494 return convert_size_t_to_jlong(n);
495 JVM_END
496
497
498 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
499 size_t n = Universe::heap()->unused();
500 return convert_size_t_to_jlong(n);
501 JVM_END
502
503
504 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
505 size_t n = Universe::heap()->max_capacity();
506 return convert_size_t_to_jlong(n);
507 JVM_END
508
509
510 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
511 return os::active_processor_count();
512 JVM_END
513
514 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
515 #ifdef LINUX
516 if (UseContainerSupport) {
517 return JNI_TRUE;
518 }
519 #endif
520 return JNI_FALSE;
521 JVM_END
522
523 // java.lang.Throwable //////////////////////////////////////////////////////
524
525 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
526 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
527 java_lang_Throwable::fill_in_stack_trace(exception);
528 JVM_END
529
530 // java.lang.NullPointerException ///////////////////////////////////////////
531
532 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
533 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
534
535 oop exc = JNIHandles::resolve_non_null(throwable);
536
537 Method* method;
538 int bci;
539 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
540 return nullptr;
541 }
542 if (method->is_native()) {
543 return nullptr;
544 }
545
546 stringStream ss;
547 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
548 if (ok) {
549 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
550 return (jstring) JNIHandles::make_local(THREAD, result);
551 } else {
552 return nullptr;
553 }
554 JVM_END
555
556 // java.lang.StackTraceElement //////////////////////////////////////////////
557
558
559 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
560 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
561 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
562 objArrayHandle stack_trace(THREAD, st);
563 // Fill in the allocated stack trace
564 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
565 JVM_END
566
567
568 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
569 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
570 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
571 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
572 JVM_END
573
574
575 // java.lang.StackWalker //////////////////////////////////////////////////////
576 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
577 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
578
579 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
580 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
581 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
582 if (!have_name) {
583 oop name = StringTable::intern(method->name(), CHECK);
584 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
585 }
586 if (!have_type) {
587 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
588 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
589 }
590 JVM_END
591
592 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
593 jint skip_frames, jobject contScope, jobject cont,
594 jint buffer_size, jint start_index, jobjectArray frames))
595 if (!thread->has_last_Java_frame()) {
596 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
597 }
598
599 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
600 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
601 Handle cont_h(THREAD, JNIHandles::resolve(cont));
602 // frames array is a ClassFrameInfo[] array when only getting caller reference,
603 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
604 // be null.
605 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
606 objArrayHandle frames_array_h(THREAD, fa);
607
608 if (frames_array_h->length() < buffer_size) {
609 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
610 }
611
612 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
613 buffer_size, start_index, frames_array_h, CHECK_NULL);
614 return JNIHandles::make_local(THREAD, result);
615 JVM_END
616
617
618 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
619 jint last_batch_count, jint buffer_size, jint start_index,
620 jobjectArray frames))
621 // frames array is a ClassFrameInfo[] array when only getting caller reference,
622 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
623 // be null.
624 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
625 objArrayHandle frames_array_h(THREAD, fa);
626
627 if (frames_array_h->length() < buffer_size) {
628 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
629 }
630
631 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
632 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
633 start_index, frames_array_h, THREAD);
634 JVM_END
635
636 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
637 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
638 objArrayHandle frames_array_h(THREAD, fa);
639 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
640 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
641
642 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
643 JVM_END
644
645 // java.lang.Object ///////////////////////////////////////////////
646
647
648 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
649 // as implemented in the classic virtual machine; return 0 if object is null
650 if (handle == nullptr) {
651 return 0;
652 }
653 oop obj = JNIHandles::resolve_non_null(handle);
654 if (EnableValhalla && obj->klass()->is_inline_klass()) {
655 JavaValue result(T_INT);
656 JavaCallArguments args;
657 Handle ho(THREAD, obj);
658 args.push_oop(ho);
659 methodHandle method(THREAD, Universe::value_object_hash_code_method());
660 JavaCalls::call(&result, method, &args, THREAD);
661 if (HAS_PENDING_EXCEPTION) {
662 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
663 Handle e(THREAD, PENDING_EXCEPTION);
664 CLEAR_PENDING_EXCEPTION;
665 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
666 }
667 }
668 return result.get_jint();
669 } else {
670 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
671 }
672 JVM_END
673
674
675 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
676 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
677 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
678 if (JvmtiExport::should_post_monitor_wait()) {
679 JvmtiExport::post_monitor_wait(thread, obj(), ms);
680
681 // The current thread already owns the monitor and it has not yet
682 // been added to the wait queue so the current thread cannot be
683 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
684 // event handler cannot accidentally consume an unpark() meant for
685 // the ParkEvent associated with this ObjectMonitor.
686 }
687 ObjectSynchronizer::wait(obj, ms, CHECK);
688 JVM_END
689
690
691 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
692 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
693 ObjectSynchronizer::notify(obj, CHECK);
694 JVM_END
695
696
697 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
698 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
699 ObjectSynchronizer::notifyall(obj, CHECK);
700 JVM_END
701
702
703 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
704 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
705 Klass* klass = obj->klass();
706 JvmtiVMObjectAllocEventCollector oam;
707
708 #ifdef ASSERT
709 // Just checking that the cloneable flag is set correct
710 if (obj->is_array()) {
711 guarantee(klass->is_cloneable(), "all arrays are cloneable");
712 } else {
713 guarantee(obj->is_instance(), "should be instanceOop");
714 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
715 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
716 }
717 #endif
718
719 // Check if class of obj supports the Cloneable interface.
720 // All arrays are considered to be cloneable (See JLS 20.1.5).
721 // All j.l.r.Reference classes are considered non-cloneable.
722 if (!klass->is_cloneable() ||
723 (klass->is_instance_klass() &&
724 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
725 ResourceMark rm(THREAD);
726 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
727 }
728
729 if (klass->is_inline_klass()) {
730 // Value instances have no identity, so return the current instance instead of allocating a new one
731 // Value classes cannot have finalizers, so the method can return immediately
732 return JNIHandles::make_local(THREAD, obj());
733 }
734
735 // Make shallow object copy
736 const size_t size = obj->size();
737 oop new_obj_oop = nullptr;
738 if (obj->is_array()) {
739 const int length = ((arrayOop)obj())->length();
740 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
741 /* do_zero */ true, CHECK_NULL);
742 } else {
743 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
744 }
745
746 HeapAccess<>::clone(obj(), new_obj_oop, size);
747
748 Handle new_obj(THREAD, new_obj_oop);
749 // Caution: this involves a java upcall, so the clone should be
750 // "gc-robust" by this stage.
751 if (klass->has_finalizer()) {
752 assert(obj->is_instance(), "should be instanceOop");
753 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
754 new_obj = Handle(THREAD, new_obj_oop);
755 }
756
757 return JNIHandles::make_local(THREAD, new_obj());
758 JVM_END
759
760 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
761
762 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
763 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
764 JVM_END
765
766 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
767 return InstanceKlass::is_finalization_enabled();
768 JVM_END
769
770 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
771
772 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
773 CONT_RegisterNativeMethods(env, cls);
774 JVM_END
775
776 // java.io.File ///////////////////////////////////////////////////////////////
777
778 JVM_LEAF(char*, JVM_NativePath(char* path))
779 return os::native_path(path);
780 JVM_END
781
782
783 // Misc. class handling ///////////////////////////////////////////////////////////
784
785
786 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
787 // Getting the class of the caller frame.
788 //
789 // The call stack at this point looks something like this:
790 //
791 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
792 // [1] [ @CallerSensitive API.method ]
793 // [.] [ (skipped intermediate frames) ]
794 // [n] [ caller ]
795 vframeStream vfst(thread);
796 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
797 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
798 Method* m = vfst.method();
799 assert(m != nullptr, "sanity");
800 switch (n) {
801 case 0:
802 // This must only be called from Reflection.getCallerClass
803 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
804 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
805 }
806 // fall-through
807 case 1:
808 // Frame 0 and 1 must be caller sensitive.
809 if (!m->caller_sensitive()) {
810 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
811 }
812 break;
813 default:
814 if (!m->is_ignored_by_security_stack_walk()) {
815 // We have reached the desired frame; return the holder class.
816 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
817 }
818 break;
819 }
820 }
821 return nullptr;
822 JVM_END
823
824
825 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
826 oop mirror = nullptr;
827 BasicType t = name2type(utf);
828 if (t != T_ILLEGAL && !is_reference_type(t)) {
829 mirror = Universe::java_mirror(t);
830 }
831 if (mirror == nullptr) {
832 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
833 } else {
834 return (jclass) JNIHandles::make_local(THREAD, mirror);
835 }
836 JVM_END
837
838
839 // Returns a class loaded by the bootstrap class loader; or null
840 // if not found. ClassNotFoundException is not thrown.
841 // FindClassFromBootLoader is exported to the launcher for windows.
842 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
843 const char* name))
844 // Java libraries should ensure that name is never null or illegal.
845 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
846 // It's impossible to create this class; the name cannot fit
847 // into the constant pool.
848 return nullptr;
849 }
850 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
851
852 TempNewSymbol h_name = SymbolTable::new_symbol(name);
853 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
854 if (k == nullptr) {
855 return nullptr;
856 }
857
858 if (log_is_enabled(Debug, class, resolve)) {
859 trace_class_resolution(k);
860 }
861 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
862 JVM_END
863
864 // Find a class with this name in this loader, using the caller's protection domain.
865 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
866 jboolean init, jobject loader,
867 jclass caller))
868 TempNewSymbol h_name =
869 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
870 CHECK_NULL);
871
872 oop loader_oop = JNIHandles::resolve(loader);
873 oop from_class = JNIHandles::resolve(caller);
874 oop protection_domain = nullptr;
875 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
876 // NPE. Put it in another way, the bootstrap class loader has all permission and
877 // thus no checkPackageAccess equivalence in the VM class loader.
878 // The caller is also passed as null by the java code if there is no security
879 // manager to avoid the performance cost of getting the calling class.
880 if (from_class != nullptr && loader_oop != nullptr) {
881 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
882 }
883
884 Handle h_loader(THREAD, loader_oop);
885 Handle h_prot(THREAD, protection_domain);
886 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
887 h_prot, false, THREAD);
888
889 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
890 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
891 }
892 return result;
893 JVM_END
894
895 // Currently only called from the old verifier.
896 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
897 jboolean init, jclass from))
898 TempNewSymbol h_name =
899 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
900 CHECK_NULL);
901 oop from_class_oop = JNIHandles::resolve(from);
902 Klass* from_class = (from_class_oop == nullptr)
903 ? (Klass*)nullptr
904 : java_lang_Class::as_Klass(from_class_oop);
905 oop class_loader = nullptr;
906 oop protection_domain = nullptr;
907 if (from_class != nullptr) {
908 class_loader = from_class->class_loader();
909 protection_domain = from_class->protection_domain();
910 }
911 Handle h_loader(THREAD, class_loader);
912 Handle h_prot (THREAD, protection_domain);
913 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
914 h_prot, true, thread);
915
916 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
917 // this function is generally only used for class loading during verification.
918 ResourceMark rm;
919 oop from_mirror = JNIHandles::resolve_non_null(from);
920 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
921 const char * from_name = from_class->external_name();
922
923 oop mirror = JNIHandles::resolve_non_null(result);
924 Klass* to_class = java_lang_Class::as_Klass(mirror);
925 const char * to = to_class->external_name();
926 log_debug(class, resolve)("%s %s (verification)", from_name, to);
927 }
928
929 return result;
930 JVM_END
931
932 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
933 static jclass jvm_define_class_common(const char *name,
934 jobject loader, const jbyte *buf,
935 jsize len, jobject pd, const char *source,
936 TRAPS) {
937 if (source == nullptr) source = "__JVM_DefineClass__";
938
939 JavaThread* jt = THREAD;
940
941 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
942 ClassLoader::perf_define_appclass_selftime(),
943 ClassLoader::perf_define_appclasses(),
944 jt->get_thread_stat()->perf_recursion_counts_addr(),
945 jt->get_thread_stat()->perf_timers_addr(),
946 PerfClassTraceTime::DEFINE_CLASS);
947
948 if (UsePerfData) {
949 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
950 }
951
952 // Class resolution will get the class name from the .class stream if the name is null.
953 TempNewSymbol class_name = name == nullptr ? nullptr :
954 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
955 CHECK_NULL);
956
957 ResourceMark rm(THREAD);
958 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
959 Handle class_loader (THREAD, JNIHandles::resolve(loader));
960 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
961 ClassLoadInfo cl_info(protection_domain);
962 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
963 class_loader,
964 cl_info,
965 CHECK_NULL);
966
967 if (log_is_enabled(Debug, class, resolve)) {
968 trace_class_resolution(k);
969 }
970
971 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
972 }
973
974 enum {
975 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
976 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
977 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
978 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
979 };
980
981 /*
982 * Define a class with the specified flags that indicates if it's a nestmate,
983 * hidden, or strongly referenced from class loader.
984 */
985 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
986 const jbyte *buf, jsize len, jobject pd,
987 jboolean init, int flags, jobject classData, TRAPS) {
988 ResourceMark rm(THREAD);
989
990 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
991 // Lookup class must be a non-null instance
992 if (lookup_k == nullptr) {
993 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
994 }
995 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
996
997 Handle class_loader (THREAD, lookup_k->class_loader());
998
999 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1000 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1001 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1002 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1003
1004 InstanceKlass* host_class = nullptr;
1005 if (is_nestmate) {
1006 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1007 }
1008
1009 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1010 name,
1011 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1012 is_nestmate ? host_class->external_name() : "",
1013 is_hidden ? "hidden" : "not hidden",
1014 is_strong ? "strong" : "weak",
1015 vm_annotations ? "with vm annotations" : "without vm annotation");
1016
1017 if (!is_hidden) {
1018 // classData is only applicable for hidden classes
1019 if (classData != nullptr) {
1020 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1021 }
1022 if (is_nestmate) {
1023 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1024 }
1025 if (!is_strong) {
1026 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1027 }
1028 if (vm_annotations) {
1029 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1030 }
1031 if (flags != STRONG_LOADER_LINK) {
1032 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1033 err_msg("invalid flag 0x%x", flags));
1034 }
1035 }
1036
1037 // Class resolution will get the class name from the .class stream if the name is null.
1038 TempNewSymbol class_name = name == nullptr ? nullptr :
1039 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1040 CHECK_NULL);
1041
1042 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1043 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1044 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1045
1046 InstanceKlass* ik = nullptr;
1047 if (!is_hidden) {
1048 ClassLoadInfo cl_info(protection_domain);
1049 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1050 class_loader,
1051 cl_info,
1052 CHECK_NULL);
1053
1054 if (log_is_enabled(Debug, class, resolve)) {
1055 trace_class_resolution(ik);
1056 }
1057 } else { // hidden
1058 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1059 ClassLoadInfo cl_info(protection_domain,
1060 host_class,
1061 classData_h,
1062 is_hidden,
1063 is_strong,
1064 vm_annotations);
1065 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1066 class_loader,
1067 cl_info,
1068 CHECK_NULL);
1069
1070 // The hidden class loader data has been artificially been kept alive to
1071 // this point. The mirror and any instances of this class have to keep
1072 // it alive afterwards.
1073 ik->class_loader_data()->dec_keep_alive();
1074
1075 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1076 ModuleEntry* module = ik->module();
1077 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1078 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1079 module_name,
1080 ik->external_name(),
1081 host_class->external_name(),
1082 ik->is_hidden() ? "is hidden" : "is not hidden");
1083 }
1084 }
1085
1086 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1087 // non-hidden class or nestmate class must be in the same package as the Lookup class
1088 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1089 }
1090
1091 if (init) {
1092 ik->initialize(CHECK_NULL);
1093 } else {
1094 ik->link_class(CHECK_NULL);
1095 }
1096
1097 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1098 }
1099
1100 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1101 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1102 JVM_END
1103
1104 /*
1105 * Define a class with the specified lookup class.
1106 * lookup: Lookup class
1107 * name: the name of the class
1108 * buf: class bytes
1109 * len: length of class bytes
1110 * pd: protection domain
1111 * init: initialize the class
1112 * flags: properties of the class
1113 * classData: private static pre-initialized field
1114 */
1115 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1116 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1117
1118 if (lookup == nullptr) {
1119 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1120 }
1121
1122 assert(buf != nullptr, "buf must not be null");
1123
1124 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1125 JVM_END
1126
1127 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1128
1129 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1130 JVM_END
1131
1132 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1133 ResourceMark rm(THREAD);
1134
1135 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1136 char* str = java_lang_String::as_utf8_string(h_name());
1137
1138 // Sanity check, don't expect null
1139 if (str == nullptr) return nullptr;
1140
1141 // Internalize the string, converting '.' to '/' in string.
1142 char* p = (char*)str;
1143 while (*p != '\0') {
1144 if (*p == '.') {
1145 *p = '/';
1146 }
1147 p++;
1148 }
1149
1150 const int str_len = (int)(p - str);
1151 if (str_len > Symbol::max_length()) {
1152 // It's impossible to create this class; the name cannot fit
1153 // into the constant pool.
1154 return nullptr;
1155 }
1156 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1157
1158 // Security Note:
1159 // The Java level wrapper will perform the necessary security check allowing
1160 // us to pass the null as the initiating class loader.
1161 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1162 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1163 h_loader,
1164 Handle());
1165 #if INCLUDE_CDS
1166 if (k == nullptr) {
1167 // If the class is not already loaded, try to see if it's in the shared
1168 // archive for the current classloader (h_loader).
1169 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1170 }
1171 #endif
1172 return (k == nullptr) ? nullptr :
1173 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1174 JVM_END
1175
1176 // Module support //////////////////////////////////////////////////////////////////////////////
1177
1178 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1179 jstring location, jobjectArray packages))
1180 Handle h_module (THREAD, JNIHandles::resolve(module));
1181 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1182 JVM_END
1183
1184 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1185 Handle h_module (THREAD, JNIHandles::resolve(module));
1186 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1187 JVM_END
1188
1189 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1190 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1191 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1192 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1193 JVM_END
1194
1195 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1196 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1197 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1198 JVM_END
1199
1200 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1201 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1202 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1203 JVM_END
1204
1205 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1206 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1207 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1208 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1209 JVM_END
1210
1211 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1212 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1213 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1214 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1215 JVM_END
1216
1217 // Reflection support //////////////////////////////////////////////////////////////////////////////
1218
1219 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1220 assert (cls != nullptr, "illegal class");
1221 JvmtiVMObjectAllocEventCollector oam;
1222 ResourceMark rm(THREAD);
1223 HandleMark hm(THREAD);
1224 Handle java_class(THREAD, JNIHandles::resolve(cls));
1225 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1226 return (jstring) JNIHandles::make_local(THREAD, result);
1227 JVM_END
1228
1229
1230 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1231 JvmtiVMObjectAllocEventCollector oam;
1232 oop mirror = JNIHandles::resolve_non_null(cls);
1233
1234 // Special handling for primitive objects
1235 if (java_lang_Class::is_primitive(mirror)) {
1236 // Primitive objects does not have any interfaces
1237 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1238 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1239 }
1240
1241 Klass* klass = java_lang_Class::as_Klass(mirror);
1242 // Figure size of result array
1243 int size;
1244 if (klass->is_instance_klass()) {
1245 InstanceKlass* ik = InstanceKlass::cast(klass);
1246 size = ik->local_interfaces()->length();
1247 } else {
1248 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1249 size = 2;
1250 }
1251
1252 // Allocate result array
1253 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1254 objArrayHandle result (THREAD, r);
1255 // Fill in result
1256 if (klass->is_instance_klass()) {
1257 // Regular instance klass, fill in all local interfaces
1258 for (int index = 0; index < size; index++) {
1259 InstanceKlass* ik = InstanceKlass::cast(klass);
1260 Klass* k = ik->local_interfaces()->at(index);
1261 result->obj_at_put(index, k->java_mirror());
1262 }
1263 } else {
1264 // All arrays implement java.lang.Cloneable and java.io.Serializable
1265 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1266 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1267 }
1268 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1269 JVM_END
1270
1271
1272 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1273 oop mirror = JNIHandles::resolve_non_null(cls);
1274 if (java_lang_Class::is_primitive(mirror)) {
1275 return JNI_FALSE;
1276 }
1277 Klass* k = java_lang_Class::as_Klass(mirror);
1278 jboolean result = k->is_interface();
1279 assert(!result || k->is_instance_klass(),
1280 "all interfaces are instance types");
1281 // The compiler intrinsic for isInterface tests the
1282 // Klass::_access_flags bits in the same way.
1283 return result;
1284 JVM_END
1285
1286 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1287 oop mirror = JNIHandles::resolve_non_null(cls);
1288 if (java_lang_Class::is_primitive(mirror)) {
1289 return JNI_FALSE;
1290 }
1291 Klass* k = java_lang_Class::as_Klass(mirror);
1292 return k->is_hidden();
1293 JVM_END
1294
1295 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls))
1296 oop mirror = JNIHandles::resolve_non_null(cls);
1297 if (java_lang_Class::is_primitive(mirror)) {
1298 return JNI_FALSE;
1299 }
1300 Klass* k = java_lang_Class::as_Klass(mirror);
1301 if (EnableValhalla) {
1302 return k->is_array_klass() || k->is_identity_class();
1303 } else {
1304 return k->is_interface() ? JNI_FALSE : JNI_TRUE;
1305 }
1306 JVM_END
1307
1308 JVM_ENTRY(jboolean, JVM_IsImplicitlyConstructibleClass(JNIEnv *env, jclass cls))
1309 oop mirror = JNIHandles::resolve_non_null(cls);
1310 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1311 return ik->is_implicitly_constructible();
1312 JVM_END
1313
1314 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1315 JvmtiVMObjectAllocEventCollector oam;
1316 oop mirror = JNIHandles::resolve_non_null(cls);
1317 if (java_lang_Class::is_primitive(mirror)) {
1318 // There are no signers for primitive types
1319 return nullptr;
1320 }
1321
1322 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1323
1324 // If there are no signers set in the class, or if the class
1325 // is an array, return null.
1326 if (signers == nullptr) return nullptr;
1327
1328 // copy of the signers array
1329 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1330 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1331 for (int index = 0; index < signers->length(); index++) {
1332 signers_copy->obj_at_put(index, signers->obj_at(index));
1333 }
1334
1335 // return the copy
1336 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1337 JVM_END
1338
1339
1340 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1341 oop mirror = JNIHandles::resolve_non_null(cls);
1342 if (!java_lang_Class::is_primitive(mirror)) {
1343 // This call is ignored for primitive types and arrays.
1344 // Signers are only set once, ClassLoader.java, and thus shouldn't
1345 // be called with an array. Only the bootstrap loader creates arrays.
1346 Klass* k = java_lang_Class::as_Klass(mirror);
1347 if (k->is_instance_klass()) {
1348 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1349 }
1350 }
1351 JVM_END
1352
1353
1354 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1355 oop mirror = JNIHandles::resolve_non_null(cls);
1356 if (mirror == nullptr) {
1357 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1358 }
1359
1360 if (java_lang_Class::is_primitive(mirror)) {
1361 // Primitive types does not have a protection domain.
1362 return nullptr;
1363 }
1364
1365 oop pd = java_lang_Class::protection_domain(mirror);
1366 return (jobject) JNIHandles::make_local(THREAD, pd);
1367 JVM_END
1368
1369
1370 // Returns the inherited_access_control_context field of the running thread.
1371 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1372 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1373 return JNIHandles::make_local(THREAD, result);
1374 JVM_END
1375
1376 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1377 if (!UsePrivilegedStack) return nullptr;
1378
1379 ResourceMark rm(THREAD);
1380 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1381 JvmtiVMObjectAllocEventCollector oam;
1382
1383 // count the protection domains on the execution stack. We collapse
1384 // duplicate consecutive protection domains into a single one, as
1385 // well as stopping when we hit a privileged frame.
1386
1387 oop previous_protection_domain = nullptr;
1388 Handle privileged_context(thread, nullptr);
1389 bool is_privileged = false;
1390 oop protection_domain = nullptr;
1391
1392 // Iterate through Java frames
1393 vframeStream vfst(thread);
1394 for(; !vfst.at_end(); vfst.next()) {
1395 // get method of frame
1396 Method* method = vfst.method();
1397
1398 // stop at the first privileged frame
1399 if (method->method_holder() == vmClasses::AccessController_klass() &&
1400 method->name() == vmSymbols::executePrivileged_name())
1401 {
1402 // this frame is privileged
1403 is_privileged = true;
1404
1405 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1406
1407 StackValueCollection* locals = priv->locals();
1408 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1409 StackValue* clr_sv = locals->at(2); // Class<?> caller
1410 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1411 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1412 privileged_context = ctx_sv->get_obj();
1413 Handle caller = clr_sv->get_obj();
1414
1415 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1416 protection_domain = caller_klass->protection_domain();
1417 } else {
1418 protection_domain = method->method_holder()->protection_domain();
1419 }
1420
1421 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1422 local_array->push(Handle(thread, protection_domain));
1423 previous_protection_domain = protection_domain;
1424 }
1425
1426 if (is_privileged) break;
1427 }
1428
1429
1430 // either all the domains on the stack were system domains, or
1431 // we had a privileged system domain
1432 if (local_array->is_empty()) {
1433 if (is_privileged && privileged_context.is_null()) return nullptr;
1434
1435 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1436 return JNIHandles::make_local(THREAD, result);
1437 }
1438
1439 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1440 local_array->length(), CHECK_NULL);
1441 objArrayHandle h_context(thread, context);
1442 for (int index = 0; index < local_array->length(); index++) {
1443 h_context->obj_at_put(index, local_array->at(index)());
1444 }
1445
1446 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1447
1448 return JNIHandles::make_local(THREAD, result);
1449 JVM_END
1450
1451 class ScopedValueBindingsResolver {
1452 public:
1453 InstanceKlass* Carrier_klass;
1454 ScopedValueBindingsResolver(JavaThread* THREAD) {
1455 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1456 Carrier_klass = InstanceKlass::cast(k);
1457 }
1458 };
1459
1460 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1461 ResourceMark rm(THREAD);
1462 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1463 JvmtiVMObjectAllocEventCollector oam;
1464
1465 static ScopedValueBindingsResolver resolver(THREAD);
1466
1467 // Iterate through Java frames
1468 vframeStream vfst(thread);
1469 for(; !vfst.at_end(); vfst.next()) {
1470 int loc = -1;
1471 // get method of frame
1472 Method* method = vfst.method();
1473
1474 Symbol *name = method->name();
1475
1476 InstanceKlass* holder = method->method_holder();
1477 if (name == vmSymbols::runWith_method_name()) {
1478 if (holder == vmClasses::Thread_klass()
1479 || holder == resolver.Carrier_klass) {
1480 loc = 1;
1481 }
1482 }
1483
1484 if (loc != -1) {
1485 javaVFrame *frame = vfst.asJavaVFrame();
1486 StackValueCollection* locals = frame->locals();
1487 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1488 Handle result = head_sv->get_obj();
1489 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1490 if (result() != nullptr) {
1491 return JNIHandles::make_local(THREAD, result());
1492 }
1493 }
1494 }
1495
1496 return nullptr;
1497 JVM_END
1498
1499 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1501 return (k != nullptr) && k->is_array_klass() ? true : false;
1502 JVM_END
1503
1504
1505 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1506 oop mirror = JNIHandles::resolve_non_null(cls);
1507 return (jboolean) java_lang_Class::is_primitive(mirror);
1508 JVM_END
1509
1510
1511 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1512 oop mirror = JNIHandles::resolve_non_null(cls);
1513 if (java_lang_Class::is_primitive(mirror)) {
1514 // Primitive type
1515 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1516 }
1517
1518 Klass* k = java_lang_Class::as_Klass(mirror);
1519 debug_only(int computed_modifiers = k->compute_modifier_flags());
1520 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1521 return k->modifier_flags();
1522 JVM_END
1523
1524
1525 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1526
1527 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1528 JvmtiVMObjectAllocEventCollector oam;
1529 // ofClass is a reference to a java_lang_Class object. The mirror object
1530 // of an InstanceKlass
1531 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1532 if (java_lang_Class::is_primitive(ofMirror) ||
1533 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1534 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1535 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1536 }
1537
1538 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1539 InnerClassesIterator iter(k);
1540
1541 if (iter.length() == 0) {
1542 // Neither an inner nor outer class
1543 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1544 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1545 }
1546
1547 // find inner class info
1548 constantPoolHandle cp(thread, k->constants());
1549 int length = iter.length();
1550
1551 // Allocate temp. result array
1552 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1553 objArrayHandle result (THREAD, r);
1554 int members = 0;
1555
1556 for (; !iter.done(); iter.next()) {
1557 int ioff = iter.inner_class_info_index();
1558 int ooff = iter.outer_class_info_index();
1559
1560 if (ioff != 0 && ooff != 0) {
1561 // Check to see if the name matches the class we're looking for
1562 // before attempting to find the class.
1563 if (cp->klass_name_at_matches(k, ooff)) {
1564 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1565 if (outer_klass == k) {
1566 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1567 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1568
1569 // Throws an exception if outer klass has not declared k as
1570 // an inner klass
1571 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1572
1573 result->obj_at_put(members, inner_klass->java_mirror());
1574 members++;
1575 }
1576 }
1577 }
1578 }
1579
1580 if (members != length) {
1581 // Return array of right length
1582 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1583 for(int i = 0; i < members; i++) {
1584 res->obj_at_put(i, result->obj_at(i));
1585 }
1586 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1587 }
1588
1589 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1590 JVM_END
1591
1592
1593 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1594 {
1595 // ofClass is a reference to a java_lang_Class object.
1596 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1597 if (java_lang_Class::is_primitive(ofMirror)) {
1598 return nullptr;
1599 }
1600 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1601 if (!klass->is_instance_klass()) {
1602 return nullptr;
1603 }
1604
1605 bool inner_is_member = false;
1606 Klass* outer_klass
1607 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1608 if (outer_klass == nullptr) return nullptr; // already a top-level class
1609 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1610 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1611 }
1612 JVM_END
1613
1614 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1615 {
1616 oop mirror = JNIHandles::resolve_non_null(cls);
1617 if (java_lang_Class::is_primitive(mirror)) {
1618 return nullptr;
1619 }
1620 Klass* klass = java_lang_Class::as_Klass(mirror);
1621 if (!klass->is_instance_klass()) {
1622 return nullptr;
1623 }
1624 InstanceKlass* k = InstanceKlass::cast(klass);
1625 int ooff = 0, noff = 0;
1626 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1627 if (noff != 0) {
1628 constantPoolHandle i_cp(thread, k->constants());
1629 Symbol* name = i_cp->symbol_at(noff);
1630 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1631 return (jstring) JNIHandles::make_local(THREAD, str());
1632 }
1633 }
1634 return nullptr;
1635 }
1636 JVM_END
1637
1638 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1639 assert (cls != nullptr, "illegal class");
1640 JvmtiVMObjectAllocEventCollector oam;
1641 ResourceMark rm(THREAD);
1642 oop mirror = JNIHandles::resolve_non_null(cls);
1643 // Return null for arrays and primitives
1644 if (!java_lang_Class::is_primitive(mirror)) {
1645 Klass* k = java_lang_Class::as_Klass(mirror);
1646 if (k->is_instance_klass()) {
1647 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1648 if (sym == nullptr) return nullptr;
1649 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1650 return (jstring) JNIHandles::make_local(THREAD, str());
1651 }
1652 }
1653 return nullptr;
1654 JVM_END
1655
1656
1657 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1658 assert (cls != nullptr, "illegal class");
1659 oop mirror = JNIHandles::resolve_non_null(cls);
1660 // Return null for arrays and primitives
1661 if (!java_lang_Class::is_primitive(mirror)) {
1662 Klass* k = java_lang_Class::as_Klass(mirror);
1663 if (k->is_instance_klass()) {
1664 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1665 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1666 }
1667 }
1668 return nullptr;
1669 JVM_END
1670
1671
1672 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1673 // some of this code was adapted from from jni_FromReflectedField
1674
1675 oop reflected = JNIHandles::resolve_non_null(field);
1676 oop mirror = java_lang_reflect_Field::clazz(reflected);
1677 Klass* k = java_lang_Class::as_Klass(mirror);
1678 int slot = java_lang_reflect_Field::slot(reflected);
1679 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1680
1681 InstanceKlass* ik = InstanceKlass::cast(k);
1682 int offset = ik->field_offset(slot);
1683
1684 if (modifiers & JVM_ACC_STATIC) {
1685 // for static fields we only look in the current class
1686 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1687 assert(false, "cannot find static field");
1688 return false;
1689 }
1690 } else {
1691 // for instance fields we start with the current class and work
1692 // our way up through the superclass chain
1693 if (!ik->find_field_from_offset(offset, false, &fd)) {
1694 assert(false, "cannot find instance field");
1695 return false;
1696 }
1697 }
1698 return true;
1699 }
1700
1701 static Method* jvm_get_method_common(jobject method) {
1702 // some of this code was adapted from from jni_FromReflectedMethod
1703
1704 oop reflected = JNIHandles::resolve_non_null(method);
1705 oop mirror = nullptr;
1706 int slot = 0;
1707
1708 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1709 mirror = java_lang_reflect_Constructor::clazz(reflected);
1710 slot = java_lang_reflect_Constructor::slot(reflected);
1711 } else {
1712 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1713 "wrong type");
1714 mirror = java_lang_reflect_Method::clazz(reflected);
1715 slot = java_lang_reflect_Method::slot(reflected);
1716 }
1717 Klass* k = java_lang_Class::as_Klass(mirror);
1718
1719 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1720 assert(m != nullptr, "cannot find method");
1721 return m; // caller has to deal with null in product mode
1722 }
1723
1724 /* Type use annotations support (JDK 1.8) */
1725
1726 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1727 assert (cls != nullptr, "illegal class");
1728 ResourceMark rm(THREAD);
1729 // Return null for arrays and primitives
1730 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1731 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1732 if (k->is_instance_klass()) {
1733 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1734 if (type_annotations != nullptr) {
1735 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1736 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1737 }
1738 }
1739 }
1740 return nullptr;
1741 JVM_END
1742
1743 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1744 assert (method != nullptr, "illegal method");
1745 // method is a handle to a java.lang.reflect.Method object
1746 Method* m = jvm_get_method_common(method);
1747 if (m == nullptr) {
1748 return nullptr;
1749 }
1750
1751 AnnotationArray* type_annotations = m->type_annotations();
1752 if (type_annotations != nullptr) {
1753 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1754 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1755 }
1756
1757 return nullptr;
1758 JVM_END
1759
1760 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1761 assert (field != nullptr, "illegal field");
1762 fieldDescriptor fd;
1763 bool gotFd = jvm_get_field_common(field, fd);
1764 if (!gotFd) {
1765 return nullptr;
1766 }
1767
1768 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1769 JVM_END
1770
1771 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1772 if (!cp->is_within_bounds(index)) {
1773 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1774 }
1775 }
1776
1777 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1778 {
1779 // method is a handle to a java.lang.reflect.Method object
1780 Method* method_ptr = jvm_get_method_common(method);
1781 methodHandle mh (THREAD, method_ptr);
1782 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1783 const int num_params = mh->method_parameters_length();
1784
1785 if (num_params < 0) {
1786 // A -1 return value from method_parameters_length means there is no
1787 // parameter data. Return null to indicate this to the reflection
1788 // API.
1789 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1790 return (jobjectArray)nullptr;
1791 } else {
1792 // Otherwise, we return something up to reflection, even if it is
1793 // a zero-length array. Why? Because in some cases this can
1794 // trigger a MalformedParametersException.
1795
1796 // make sure all the symbols are properly formatted
1797 for (int i = 0; i < num_params; i++) {
1798 MethodParametersElement* params = mh->method_parameters_start();
1799 int index = params[i].name_cp_index;
1800 constantPoolHandle cp(THREAD, mh->constants());
1801 bounds_check(cp, index, CHECK_NULL);
1802
1803 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1804 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1805 "Wrong type at constant pool index");
1806 }
1807
1808 }
1809
1810 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1811 objArrayHandle result (THREAD, result_oop);
1812
1813 for (int i = 0; i < num_params; i++) {
1814 MethodParametersElement* params = mh->method_parameters_start();
1815 // For a 0 index, give a null symbol
1816 Symbol* sym = 0 != params[i].name_cp_index ?
1817 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1818 int flags = params[i].flags;
1819 oop param = Reflection::new_parameter(reflected_method, i, sym,
1820 flags, CHECK_NULL);
1821 result->obj_at_put(i, param);
1822 }
1823 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1824 }
1825 }
1826 JVM_END
1827
1828 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1829
1830 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1831 {
1832 JvmtiVMObjectAllocEventCollector oam;
1833
1834 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1835 // Exclude primitive types and array types
1836 if (java_lang_Class::is_primitive(ofMirror) ||
1837 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1838 // Return empty array
1839 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1840 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1841 }
1842
1843 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1844 constantPoolHandle cp(THREAD, k->constants());
1845
1846 // Ensure class is linked
1847 k->link_class(CHECK_NULL);
1848
1849 // Allocate result
1850 int num_fields;
1851
1852 if (publicOnly) {
1853 num_fields = 0;
1854 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1855 if (fs.access_flags().is_public()) ++num_fields;
1856 }
1857 } else {
1858 num_fields = k->java_fields_count();
1859 }
1860
1861 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1862 objArrayHandle result (THREAD, r);
1863
1864 int out_idx = 0;
1865 fieldDescriptor fd;
1866 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1867 if (!publicOnly || fs.access_flags().is_public()) {
1868 fd.reinitialize(k, fs.index());
1869 oop field = Reflection::new_field(&fd, CHECK_NULL);
1870 result->obj_at_put(out_idx, field);
1871 ++out_idx;
1872 }
1873 }
1874 assert(out_idx == num_fields, "just checking");
1875 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1876 }
1877 JVM_END
1878
1879 // A class is a record if and only if it is final and a direct subclass of
1880 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1881 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1882 {
1883 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1884 if (k != nullptr && k->is_instance_klass()) {
1885 InstanceKlass* ik = InstanceKlass::cast(k);
1886 return ik->is_record();
1887 } else {
1888 return false;
1889 }
1890 }
1891 JVM_END
1892
1893 // Returns an array containing the components of the Record attribute,
1894 // or null if the attribute is not present.
1895 //
1896 // Note that this function returns the components of the Record attribute
1897 // even if the class is not a record.
1898 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1899 {
1900 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1901 assert(c->is_instance_klass(), "must be");
1902 InstanceKlass* ik = InstanceKlass::cast(c);
1903
1904 Array<RecordComponent*>* components = ik->record_components();
1905 if (components != nullptr) {
1906 JvmtiVMObjectAllocEventCollector oam;
1907 constantPoolHandle cp(THREAD, ik->constants());
1908 int length = components->length();
1909 assert(length >= 0, "unexpected record_components length");
1910 objArrayOop record_components =
1911 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1912 objArrayHandle components_h (THREAD, record_components);
1913
1914 for (int x = 0; x < length; x++) {
1915 RecordComponent* component = components->at(x);
1916 assert(component != nullptr, "unexpected null record component");
1917 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1918 components_h->obj_at_put(x, component_oop);
1919 }
1920 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1921 }
1922
1923 return nullptr;
1924 }
1925 JVM_END
1926
1927 static bool select_method(const methodHandle& method, bool want_constructor) {
1928 bool is_ctor = (method->is_object_constructor());
1929 if (want_constructor) {
1930 return is_ctor;
1931 } else {
1932 return (!is_ctor &&
1933 !method->is_class_initializer() &&
1934 !method->is_overpass());
1935 }
1936 }
1937
1938 static jobjectArray get_class_declared_methods_helper(
1939 JNIEnv *env,
1940 jclass ofClass, jboolean publicOnly,
1941 bool want_constructor,
1942 Klass* klass, TRAPS) {
1943
1944 JvmtiVMObjectAllocEventCollector oam;
1945
1946 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1947 // Exclude primitive types and array types
1948 if (java_lang_Class::is_primitive(ofMirror)
1949 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1950 // Return empty array
1951 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1952 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1953 }
1954
1955 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1956
1957 // Ensure class is linked
1958 k->link_class(CHECK_NULL);
1959
1960 Array<Method*>* methods = k->methods();
1961 int methods_length = methods->length();
1962
1963 // Save original method_idnum in case of redefinition, which can change
1964 // the idnum of obsolete methods. The new method will have the same idnum
1965 // but if we refresh the methods array, the counts will be wrong.
1966 ResourceMark rm(THREAD);
1967 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1968 int num_methods = 0;
1969
1970 for (int i = 0; i < methods_length; i++) {
1971 methodHandle method(THREAD, methods->at(i));
1972 if (select_method(method, want_constructor)) {
1973 if (!publicOnly || method->is_public()) {
1974 idnums->push(method->method_idnum());
1975 ++num_methods;
1976 }
1977 }
1978 }
1979
1980 // Allocate result
1981 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1982 objArrayHandle result (THREAD, r);
1983
1984 // Now just put the methods that we selected above, but go by their idnum
1985 // in case of redefinition. The methods can be redefined at any safepoint,
1986 // so above when allocating the oop array and below when creating reflect
1987 // objects.
1988 for (int i = 0; i < num_methods; i++) {
1989 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1990 if (method.is_null()) {
1991 // Method may have been deleted and seems this API can handle null
1992 // Otherwise should probably put a method that throws NSME
1993 result->obj_at_put(i, nullptr);
1994 } else {
1995 oop m;
1996 if (want_constructor) {
1997 assert(method->is_object_constructor(), "must be");
1998 m = Reflection::new_constructor(method, CHECK_NULL);
1999 } else {
2000 m = Reflection::new_method(method, false, CHECK_NULL);
2001 }
2002 result->obj_at_put(i, m);
2003 }
2004 }
2005
2006 return (jobjectArray) JNIHandles::make_local(THREAD, result());
2007 }
2008
2009 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2010 {
2011 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2012 /*want_constructor*/ false,
2013 vmClasses::reflect_Method_klass(), THREAD);
2014 }
2015 JVM_END
2016
2017 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2018 {
2019 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2020 /*want_constructor*/ true,
2021 vmClasses::reflect_Constructor_klass(), THREAD);
2022 }
2023 JVM_END
2024
2025 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2026 {
2027 oop mirror = JNIHandles::resolve_non_null(cls);
2028 if (java_lang_Class::is_primitive(mirror)) {
2029 // Primitive type
2030 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2031 }
2032
2033 Klass* k = java_lang_Class::as_Klass(mirror);
2034 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2035 }
2036 JVM_END
2037
2038 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2039 {
2040 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2041 assert(c->is_instance_klass(), "must be");
2042 InstanceKlass* ck = InstanceKlass::cast(c);
2043 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2044 assert(m->is_instance_klass(), "must be");
2045 InstanceKlass* mk = InstanceKlass::cast(m);
2046 return ck->has_nestmate_access_to(mk, THREAD);
2047 }
2048 JVM_END
2049
2050 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2051 {
2052 // current is not a primitive or array class
2053 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2054 assert(c->is_instance_klass(), "must be");
2055 InstanceKlass* ck = InstanceKlass::cast(c);
2056 InstanceKlass* host = ck->nest_host(THREAD);
2057 return (jclass) (host == nullptr ? nullptr :
2058 JNIHandles::make_local(THREAD, host->java_mirror()));
2059 }
2060 JVM_END
2061
2062 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2063 {
2064 // current is not a primitive or array class
2065 ResourceMark rm(THREAD);
2066 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2067 assert(c->is_instance_klass(), "must be");
2068 InstanceKlass* ck = InstanceKlass::cast(c);
2069 InstanceKlass* host = ck->nest_host(THREAD);
2070
2071 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2072 ck->external_name(), host->external_name());
2073 {
2074 JvmtiVMObjectAllocEventCollector oam;
2075 Array<u2>* members = host->nest_members();
2076 int length = members == nullptr ? 0 : members->length();
2077
2078 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2079
2080 // nest host is first in the array so make it one bigger
2081 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2082 length + 1, CHECK_NULL);
2083 objArrayHandle result(THREAD, r);
2084 result->obj_at_put(0, host->java_mirror());
2085 if (length != 0) {
2086 int count = 0;
2087 for (int i = 0; i < length; i++) {
2088 int cp_index = members->at(i);
2089 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2090 if (HAS_PENDING_EXCEPTION) {
2091 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2092 return nullptr; // propagate VMEs
2093 }
2094 if (log_is_enabled(Trace, class, nestmates)) {
2095 stringStream ss;
2096 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2097 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2098 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2099 log_trace(class, nestmates)("%s", ss.as_string());
2100 }
2101 CLEAR_PENDING_EXCEPTION;
2102 continue;
2103 }
2104 if (k->is_instance_klass()) {
2105 InstanceKlass* ik = InstanceKlass::cast(k);
2106 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2107 if (nest_host_k == host) {
2108 result->obj_at_put(count+1, k->java_mirror());
2109 count++;
2110 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2111 } else {
2112 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2113 ik->external_name(), nest_host_k->external_name());
2114 }
2115 } else {
2116 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2117 k->external_name());
2118 }
2119 }
2120 if (count < length) {
2121 // we had invalid entries so we need to compact the array
2122 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2123 length + 1, count + 1);
2124
2125 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2126 count + 1, CHECK_NULL);
2127 objArrayHandle result2(THREAD, r2);
2128 for (int i = 0; i < count + 1; i++) {
2129 result2->obj_at_put(i, result->obj_at(i));
2130 }
2131 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2132 }
2133 }
2134 else {
2135 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2136 }
2137 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2138 }
2139 }
2140 JVM_END
2141
2142 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2143 {
2144 oop mirror = JNIHandles::resolve_non_null(current);
2145 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2146 Klass* c = java_lang_Class::as_Klass(mirror);
2147 assert(c->is_instance_klass(), "must be");
2148 InstanceKlass* ik = InstanceKlass::cast(c);
2149 ResourceMark rm(THREAD);
2150 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2151 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2152 if (ik->is_sealed()) {
2153 JvmtiVMObjectAllocEventCollector oam;
2154 Array<u2>* subclasses = ik->permitted_subclasses();
2155 int length = subclasses->length();
2156
2157 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2158
2159 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2160 length, CHECK_NULL);
2161 objArrayHandle result(THREAD, r);
2162 int count = 0;
2163 for (int i = 0; i < length; i++) {
2164 int cp_index = subclasses->at(i);
2165 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2166 if (HAS_PENDING_EXCEPTION) {
2167 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2168 return nullptr; // propagate VMEs
2169 }
2170 if (log_is_enabled(Trace, class, sealed)) {
2171 stringStream ss;
2172 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2173 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2174 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2175 log_trace(class, sealed)("%s", ss.as_string());
2176 }
2177
2178 CLEAR_PENDING_EXCEPTION;
2179 continue;
2180 }
2181 if (k->is_instance_klass()) {
2182 result->obj_at_put(count++, k->java_mirror());
2183 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2184 }
2185 }
2186 if (count < length) {
2187 // we had invalid entries so we need to compact the array
2188 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2189 count, CHECK_NULL);
2190 objArrayHandle result2(THREAD, r2);
2191 for (int i = 0; i < count; i++) {
2192 result2->obj_at_put(i, result->obj_at(i));
2193 }
2194 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2195 }
2196 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2197 } else {
2198 return nullptr;
2199 }
2200 }
2201 JVM_END
2202
2203 // Constant pool access //////////////////////////////////////////////////////////
2204
2205 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2206 {
2207 JvmtiVMObjectAllocEventCollector oam;
2208 oop mirror = JNIHandles::resolve_non_null(cls);
2209 // Return null for primitives and arrays
2210 if (!java_lang_Class::is_primitive(mirror)) {
2211 Klass* k = java_lang_Class::as_Klass(mirror);
2212 if (k->is_instance_klass()) {
2213 InstanceKlass* k_h = InstanceKlass::cast(k);
2214 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2215 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2216 return JNIHandles::make_local(THREAD, jcp());
2217 }
2218 }
2219 return nullptr;
2220 }
2221 JVM_END
2222
2223
2224 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2225 {
2226 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2227 return cp->length();
2228 }
2229 JVM_END
2230
2231
2232 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2233 {
2234 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2235 bounds_check(cp, index, CHECK_NULL);
2236 constantTag tag = cp->tag_at(index);
2237 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2238 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2239 }
2240 Klass* k = cp->klass_at(index, CHECK_NULL);
2241 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2242 }
2243 JVM_END
2244
2245 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2246 {
2247 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2248 bounds_check(cp, index, CHECK_NULL);
2249 constantTag tag = cp->tag_at(index);
2250 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2251 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2252 }
2253 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2254 if (k == nullptr) return nullptr;
2255 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2256 }
2257 JVM_END
2258
2259 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2260 constantTag tag = cp->tag_at(index);
2261 if (!tag.is_method() && !tag.is_interface_method()) {
2262 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2263 }
2264 int klass_ref = cp->uncached_klass_ref_index_at(index);
2265 Klass* k_o;
2266 if (force_resolution) {
2267 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2268 } else {
2269 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2270 if (k_o == nullptr) return nullptr;
2271 }
2272 InstanceKlass* k = InstanceKlass::cast(k_o);
2273 Symbol* name = cp->uncached_name_ref_at(index);
2274 Symbol* sig = cp->uncached_signature_ref_at(index);
2275 methodHandle m (THREAD, k->find_method(name, sig));
2276 if (m.is_null()) {
2277 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2278 }
2279 oop method;
2280 if (m->is_object_constructor()) {
2281 method = Reflection::new_constructor(m, CHECK_NULL);
2282 } else {
2283 method = Reflection::new_method(m, true, CHECK_NULL);
2284 }
2285 return JNIHandles::make_local(THREAD, method);
2286 }
2287
2288 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2289 {
2290 JvmtiVMObjectAllocEventCollector oam;
2291 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2292 bounds_check(cp, index, CHECK_NULL);
2293 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2294 return res;
2295 }
2296 JVM_END
2297
2298 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2299 {
2300 JvmtiVMObjectAllocEventCollector oam;
2301 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2302 bounds_check(cp, index, CHECK_NULL);
2303 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2304 return res;
2305 }
2306 JVM_END
2307
2308 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2309 constantTag tag = cp->tag_at(index);
2310 if (!tag.is_field()) {
2311 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2312 }
2313 int klass_ref = cp->uncached_klass_ref_index_at(index);
2314 Klass* k_o;
2315 if (force_resolution) {
2316 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2317 } else {
2318 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2319 if (k_o == nullptr) return nullptr;
2320 }
2321 InstanceKlass* k = InstanceKlass::cast(k_o);
2322 Symbol* name = cp->uncached_name_ref_at(index);
2323 Symbol* sig = cp->uncached_signature_ref_at(index);
2324 fieldDescriptor fd;
2325 Klass* target_klass = k->find_field(name, sig, &fd);
2326 if (target_klass == nullptr) {
2327 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2328 }
2329 oop field = Reflection::new_field(&fd, CHECK_NULL);
2330 return JNIHandles::make_local(THREAD, field);
2331 }
2332
2333 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2334 {
2335 JvmtiVMObjectAllocEventCollector oam;
2336 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2337 bounds_check(cp, index, CHECK_NULL);
2338 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2339 return res;
2340 }
2341 JVM_END
2342
2343 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2344 {
2345 JvmtiVMObjectAllocEventCollector oam;
2346 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2347 bounds_check(cp, index, CHECK_NULL);
2348 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2349 return res;
2350 }
2351 JVM_END
2352
2353 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2354 {
2355 JvmtiVMObjectAllocEventCollector oam;
2356 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2357 bounds_check(cp, index, CHECK_NULL);
2358 constantTag tag = cp->tag_at(index);
2359 if (!tag.is_field_or_method()) {
2360 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2361 }
2362 int klass_ref = cp->uncached_klass_ref_index_at(index);
2363 Symbol* klass_name = cp->klass_name_at(klass_ref);
2364 Symbol* member_name = cp->uncached_name_ref_at(index);
2365 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2366 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2367 objArrayHandle dest(THREAD, dest_o);
2368 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2369 dest->obj_at_put(0, str());
2370 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2371 dest->obj_at_put(1, str());
2372 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2373 dest->obj_at_put(2, str());
2374 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2375 }
2376 JVM_END
2377
2378 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2379 {
2380 JvmtiVMObjectAllocEventCollector oam;
2381 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2382 bounds_check(cp, index, CHECK_0);
2383 constantTag tag = cp->tag_at(index);
2384 if (!tag.is_field_or_method()) {
2385 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2386 }
2387 return (jint) cp->uncached_klass_ref_index_at(index);
2388 }
2389 JVM_END
2390
2391 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2392 {
2393 JvmtiVMObjectAllocEventCollector oam;
2394 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2395 bounds_check(cp, index, CHECK_0);
2396 constantTag tag = cp->tag_at(index);
2397 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2398 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2399 }
2400 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2401 }
2402 JVM_END
2403
2404 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2405 {
2406 JvmtiVMObjectAllocEventCollector oam;
2407 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2408 bounds_check(cp, index, CHECK_NULL);
2409 constantTag tag = cp->tag_at(index);
2410 if (!tag.is_name_and_type()) {
2411 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2412 }
2413 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2414 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2415 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2416 objArrayHandle dest(THREAD, dest_o);
2417 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2418 dest->obj_at_put(0, str());
2419 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2420 dest->obj_at_put(1, str());
2421 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2422 }
2423 JVM_END
2424
2425 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2426 {
2427 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2428 bounds_check(cp, index, CHECK_0);
2429 constantTag tag = cp->tag_at(index);
2430 if (!tag.is_int()) {
2431 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2432 }
2433 return cp->int_at(index);
2434 }
2435 JVM_END
2436
2437 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2438 {
2439 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2440 bounds_check(cp, index, CHECK_(0L));
2441 constantTag tag = cp->tag_at(index);
2442 if (!tag.is_long()) {
2443 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2444 }
2445 return cp->long_at(index);
2446 }
2447 JVM_END
2448
2449 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2450 {
2451 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2452 bounds_check(cp, index, CHECK_(0.0f));
2453 constantTag tag = cp->tag_at(index);
2454 if (!tag.is_float()) {
2455 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2456 }
2457 return cp->float_at(index);
2458 }
2459 JVM_END
2460
2461 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2462 {
2463 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2464 bounds_check(cp, index, CHECK_(0.0));
2465 constantTag tag = cp->tag_at(index);
2466 if (!tag.is_double()) {
2467 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2468 }
2469 return cp->double_at(index);
2470 }
2471 JVM_END
2472
2473 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2474 {
2475 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2476 bounds_check(cp, index, CHECK_NULL);
2477 constantTag tag = cp->tag_at(index);
2478 if (!tag.is_string()) {
2479 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2480 }
2481 oop str = cp->string_at(index, CHECK_NULL);
2482 return (jstring) JNIHandles::make_local(THREAD, str);
2483 }
2484 JVM_END
2485
2486 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2487 {
2488 JvmtiVMObjectAllocEventCollector oam;
2489 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2490 bounds_check(cp, index, CHECK_NULL);
2491 constantTag tag = cp->tag_at(index);
2492 if (!tag.is_symbol()) {
2493 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2494 }
2495 Symbol* sym = cp->symbol_at(index);
2496 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2497 return (jstring) JNIHandles::make_local(THREAD, str());
2498 }
2499 JVM_END
2500
2501 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2502 {
2503 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2504 bounds_check(cp, index, CHECK_0);
2505 constantTag tag = cp->tag_at(index);
2506 jbyte result = tag.value();
2507 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2508 // they are changed to the corresponding tags from the JVM spec, so that java code in
2509 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2510 if (tag.is_klass_or_reference()) {
2511 result = JVM_CONSTANT_Class;
2512 } else if (tag.is_string_index()) {
2513 result = JVM_CONSTANT_String;
2514 } else if (tag.is_method_type_in_error()) {
2515 result = JVM_CONSTANT_MethodType;
2516 } else if (tag.is_method_handle_in_error()) {
2517 result = JVM_CONSTANT_MethodHandle;
2518 } else if (tag.is_dynamic_constant_in_error()) {
2519 result = JVM_CONSTANT_Dynamic;
2520 }
2521 return result;
2522 }
2523 JVM_END
2524
2525 // Assertion support. //////////////////////////////////////////////////////////
2526
2527 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2528 assert(cls != nullptr, "bad class");
2529
2530 oop r = JNIHandles::resolve(cls);
2531 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2532 if (java_lang_Class::is_primitive(r)) return false;
2533
2534 Klass* k = java_lang_Class::as_Klass(r);
2535 assert(k->is_instance_klass(), "must be an instance klass");
2536 if (!k->is_instance_klass()) return false;
2537
2538 ResourceMark rm(THREAD);
2539 const char* name = k->name()->as_C_string();
2540 bool system_class = k->class_loader() == nullptr;
2541 return JavaAssertions::enabled(name, system_class);
2542
2543 JVM_END
2544
2545
2546 // Return a new AssertionStatusDirectives object with the fields filled in with
2547 // command-line assertion arguments (i.e., -ea, -da).
2548 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2549 JvmtiVMObjectAllocEventCollector oam;
2550 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2551 return JNIHandles::make_local(THREAD, asd);
2552 JVM_END
2553
2554 // Arrays support /////////////////////////////////////////////////////////////
2555
2556 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2557 oop o = JNIHandles::resolve(array);
2558 Klass* k = o->klass();
2559 if ((o == nullptr) || (!k->is_array_klass())) {
2560 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2561 }
2562 return ArrayKlass::cast(k)->element_access_is_atomic();
2563 JVM_END
2564
2565 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2566 oop o = JNIHandles::resolve(array);
2567 Klass* k = o->klass();
2568 if ((o == nullptr) || (!k->is_array_klass())) {
2569 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2570 }
2571 if (k->is_flatArray_klass()) {
2572 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2573 if (!vk->element_access_is_atomic()) {
2574 /**
2575 * Need to decide how to implement:
2576 *
2577 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2578 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2579 * "checkcast" & "instanceof"
2580 *
2581 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2582 * possibly per instance lock structure. Said info, could be placed in
2583 * "trailer" rather than disturb the current arrayOop
2584 */
2585 Unimplemented();
2586 }
2587 }
2588 return array;
2589 JVM_END
2590
2591 // Verification ////////////////////////////////////////////////////////////////////////////////
2592
2593 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2594
2595 // RedefineClasses support: bug 6214132 caused verification to fail.
2596 // All functions from this section should call the jvmtiThreadSate function:
2597 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2598 // The function returns a Klass* of the _scratch_class if the verifier
2599 // was invoked in the middle of the class redefinition.
2600 // Otherwise it returns its argument value which is the _the_class Klass*.
2601 // Please, refer to the description in the jvmtiThreadSate.hpp.
2602
2603 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2604 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2605 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2606 return k->name()->as_utf8();
2607 JVM_END
2608
2609
2610 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613 // types will have length zero if this is not an InstanceKlass
2614 // (length is determined by call to JVM_GetClassCPEntriesCount)
2615 if (k->is_instance_klass()) {
2616 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2617 for (int index = cp->length() - 1; index >= 0; index--) {
2618 constantTag tag = cp->tag_at(index);
2619 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2620 }
2621 }
2622 JVM_END
2623
2624
2625 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2628 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2629 JVM_END
2630
2631
2632 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2633 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2634 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2635 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2636 JVM_END
2637
2638
2639 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2640 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2641 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2642 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2643 JVM_END
2644
2645
2646 // The following methods, used for the verifier, are never called with
2647 // array klasses, so a direct cast to InstanceKlass is safe.
2648 // Typically, these methods are called in a loop with bounds determined
2649 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2650 // zero for arrays.
2651 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2652 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2653 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2654 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2655 int length = method->checked_exceptions_length();
2656 if (length > 0) {
2657 CheckedExceptionElement* table= method->checked_exceptions_start();
2658 for (int i = 0; i < length; i++) {
2659 exceptions[i] = table[i].class_cp_index;
2660 }
2661 }
2662 JVM_END
2663
2664
2665 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2668 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2669 return method->checked_exceptions_length();
2670 JVM_END
2671
2672
2673 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2676 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2677 memcpy(code, method->code_base(), method->code_size());
2678 JVM_END
2679
2680
2681 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2682 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2683 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2684 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2685 return method->code_size();
2686 JVM_END
2687
2688
2689 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2690 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2691 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2692 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2693 ExceptionTable extable(method);
2694 entry->start_pc = extable.start_pc(entry_index);
2695 entry->end_pc = extable.end_pc(entry_index);
2696 entry->handler_pc = extable.handler_pc(entry_index);
2697 entry->catchType = extable.catch_type_index(entry_index);
2698 JVM_END
2699
2700
2701 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2702 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2703 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2704 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2705 return method->exception_table_length();
2706 JVM_END
2707
2708
2709 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2710 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2711 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2712 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2713 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2714 JVM_END
2715
2716
2717 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2718 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2719 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2720 return InstanceKlass::cast(k)->field_access_flags(field_index);
2721 JVM_END
2722
2723
2724 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2726 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2727 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2728 return method->max_locals();
2729 JVM_END
2730
2731
2732 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2733 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2734 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2735 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2736 return method->size_of_parameters();
2737 JVM_END
2738
2739
2740 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2741 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2742 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2743 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2744 return method->verifier_max_stack();
2745 JVM_END
2746
2747
2748 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2749 ResourceMark rm(THREAD);
2750 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2751 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2752 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2753 return method->is_object_constructor();
2754 JVM_END
2755
2756
2757 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2758 ResourceMark rm(THREAD);
2759 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2760 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2761 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2762 return method->is_overpass();
2763 JVM_END
2764
2765 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2766 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2767 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2768 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2769 return method->name()->as_utf8();
2770 JVM_END
2771
2772
2773 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2774 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2775 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2776 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2777 return method->signature()->as_utf8();
2778 JVM_END
2779
2780 /**
2781 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2782 * read entries in the constant pool. Since the old verifier always
2783 * works on a copy of the code, it will not see any rewriting that
2784 * may possibly occur in the middle of verification. So it is important
2785 * that nothing it calls tries to use the cpCache instead of the raw
2786 * constant pool, so we must use cp->uncached_x methods when appropriate.
2787 */
2788 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(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_name_ref_at(cp_index)->as_utf8();
2795 default:
2796 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2797 }
2798 ShouldNotReachHere();
2799 return nullptr;
2800 JVM_END
2801
2802
2803 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(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 switch (cp->tag_at(cp_index).value()) {
2808 case JVM_CONSTANT_InterfaceMethodref:
2809 case JVM_CONSTANT_Methodref:
2810 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2811 default:
2812 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2813 }
2814 ShouldNotReachHere();
2815 return nullptr;
2816 JVM_END
2817
2818
2819 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2820 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2821 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2822 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2823 switch (cp->tag_at(cp_index).value()) {
2824 case JVM_CONSTANT_InterfaceMethodref:
2825 case JVM_CONSTANT_Methodref:
2826 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2827 default:
2828 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2829 }
2830 ShouldNotReachHere();
2831 return nullptr;
2832 JVM_END
2833
2834
2835 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2836 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2837 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2838 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2839 switch (cp->tag_at(cp_index).value()) {
2840 case JVM_CONSTANT_Fieldref:
2841 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2842 default:
2843 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2844 }
2845 ShouldNotReachHere();
2846 return nullptr;
2847 JVM_END
2848
2849
2850 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2851 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2852 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2853 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2854 Symbol* classname = cp->klass_name_at(cp_index);
2855 return classname->as_utf8();
2856 JVM_END
2857
2858
2859 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2860 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2861 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2862 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2863 switch (cp->tag_at(cp_index).value()) {
2864 case JVM_CONSTANT_Fieldref: {
2865 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2866 Symbol* classname = cp->klass_name_at(class_index);
2867 return classname->as_utf8();
2868 }
2869 default:
2870 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2871 }
2872 ShouldNotReachHere();
2873 return nullptr;
2874 JVM_END
2875
2876
2877 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2878 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2879 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2880 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2881 switch (cp->tag_at(cp_index).value()) {
2882 case JVM_CONSTANT_Methodref:
2883 case JVM_CONSTANT_InterfaceMethodref: {
2884 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2885 Symbol* classname = cp->klass_name_at(class_index);
2886 return classname->as_utf8();
2887 }
2888 default:
2889 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2890 }
2891 ShouldNotReachHere();
2892 return nullptr;
2893 JVM_END
2894
2895
2896 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2897 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2898 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2899 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2900 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2901 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2902 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2903 switch (cp->tag_at(cp_index).value()) {
2904 case JVM_CONSTANT_Fieldref: {
2905 Symbol* name = cp->uncached_name_ref_at(cp_index);
2906 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2907 InstanceKlass* ik = InstanceKlass::cast(k_called);
2908 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2909 if (fs.name() == name && fs.signature() == signature) {
2910 return fs.access_flags().as_short();
2911 }
2912 }
2913 return -1;
2914 }
2915 default:
2916 fatal("JVM_GetCPFieldModifiers: illegal constant");
2917 }
2918 ShouldNotReachHere();
2919 return 0;
2920 JVM_END
2921
2922
2923 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2924 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2925 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2926 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2927 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2928 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2929 switch (cp->tag_at(cp_index).value()) {
2930 case JVM_CONSTANT_Methodref:
2931 case JVM_CONSTANT_InterfaceMethodref: {
2932 Symbol* name = cp->uncached_name_ref_at(cp_index);
2933 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2934 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2935 int methods_count = methods->length();
2936 for (int i = 0; i < methods_count; i++) {
2937 Method* method = methods->at(i);
2938 if (method->name() == name && method->signature() == signature) {
2939 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2940 }
2941 }
2942 return -1;
2943 }
2944 default:
2945 fatal("JVM_GetCPMethodModifiers: illegal constant");
2946 }
2947 ShouldNotReachHere();
2948 return 0;
2949 JVM_END
2950
2951
2952 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2953
2954 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2955 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2956 JVM_END
2957
2958
2959 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2960 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2961 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2962 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2963 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2964 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2965 JVM_END
2966
2967 // Printing support //////////////////////////////////////////////////
2968 extern "C" {
2969
2970 ATTRIBUTE_PRINTF(3, 0)
2971 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2972 // Reject count values that are negative signed values converted to
2973 // unsigned; see bug 4399518, 4417214
2974 if ((intptr_t)count <= 0) return -1;
2975
2976 int result = os::vsnprintf(str, count, fmt, args);
2977 if (result > 0 && (size_t)result >= count) {
2978 result = -1;
2979 }
2980
2981 return result;
2982 }
2983
2984 ATTRIBUTE_PRINTF(3, 4)
2985 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2986 va_list args;
2987 int len;
2988 va_start(args, fmt);
2989 len = jio_vsnprintf(str, count, fmt, args);
2990 va_end(args);
2991 return len;
2992 }
2993
2994 ATTRIBUTE_PRINTF(2, 3)
2995 int jio_fprintf(FILE* f, const char *fmt, ...) {
2996 int len;
2997 va_list args;
2998 va_start(args, fmt);
2999 len = jio_vfprintf(f, fmt, args);
3000 va_end(args);
3001 return len;
3002 }
3003
3004 ATTRIBUTE_PRINTF(2, 0)
3005 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
3006 if (Arguments::vfprintf_hook() != nullptr) {
3007 return Arguments::vfprintf_hook()(f, fmt, args);
3008 } else {
3009 return vfprintf(f, fmt, args);
3010 }
3011 }
3012
3013 ATTRIBUTE_PRINTF(1, 2)
3014 JNIEXPORT int jio_printf(const char *fmt, ...) {
3015 int len;
3016 va_list args;
3017 va_start(args, fmt);
3018 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
3019 va_end(args);
3020 return len;
3021 }
3022
3023 // HotSpot specific jio method
3024 void jio_print(const char* s, size_t len) {
3025 // Try to make this function as atomic as possible.
3026 if (Arguments::vfprintf_hook() != nullptr) {
3027 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
3028 } else {
3029 // Make an unused local variable to avoid warning from gcc compiler.
3030 bool dummy = os::write(defaultStream::output_fd(), s, len);
3031 }
3032 }
3033
3034 } // Extern C
3035
3036 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3037
3038 // In most of the JVM thread support functions we need to access the
3039 // thread through a ThreadsListHandle to prevent it from exiting and
3040 // being reclaimed while we try to operate on it. The exceptions to this
3041 // rule are when operating on the current thread, or if the monitor of
3042 // the target java.lang.Thread is locked at the Java level - in both
3043 // cases the target cannot exit.
3044
3045 static void thread_entry(JavaThread* thread, TRAPS) {
3046 HandleMark hm(THREAD);
3047 Handle obj(THREAD, thread->threadObj());
3048 JavaValue result(T_VOID);
3049 JavaCalls::call_virtual(&result,
3050 obj,
3051 vmClasses::Thread_klass(),
3052 vmSymbols::run_method_name(),
3053 vmSymbols::void_method_signature(),
3054 THREAD);
3055 }
3056
3057
3058 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3059 #if INCLUDE_CDS
3060 if (CDSConfig::is_dumping_static_archive()) {
3061 // During java -Xshare:dump, if we allow multiple Java threads to
3062 // execute in parallel, symbols and classes may be loaded in
3063 // random orders which will make the resulting CDS archive
3064 // non-deterministic.
3065 //
3066 // Lucikly, during java -Xshare:dump, it's important to run only
3067 // the code in the main Java thread (which is NOT started here) that
3068 // creates the module graph, etc. It's safe to not start the other
3069 // threads which are launched by class static initializers
3070 // (ReferenceHandler, FinalizerThread and CleanerImpl).
3071 if (log_is_enabled(Info, cds)) {
3072 ResourceMark rm;
3073 oop t = JNIHandles::resolve_non_null(jthread);
3074 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
3075 }
3076 return;
3077 }
3078 #endif
3079 JavaThread *native_thread = nullptr;
3080
3081 // We cannot hold the Threads_lock when we throw an exception,
3082 // due to rank ordering issues. Example: we might need to grab the
3083 // Heap_lock while we construct the exception.
3084 bool throw_illegal_thread_state = false;
3085
3086 // We must release the Threads_lock before we can post a jvmti event
3087 // in Thread::start.
3088 {
3089 // Ensure that the C++ Thread and OSThread structures aren't freed before
3090 // we operate.
3091 MutexLocker mu(Threads_lock);
3092
3093 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3094 // re-starting an already started thread, so we should usually find
3095 // that the JavaThread is null. However for a JNI attached thread
3096 // there is a small window between the Thread object being created
3097 // (with its JavaThread set) and the update to its threadStatus, so we
3098 // have to check for this
3099 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
3100 throw_illegal_thread_state = true;
3101 } else {
3102 jlong size =
3103 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3104 // Allocate the C++ Thread structure and create the native thread. The
3105 // stack size retrieved from java is 64-bit signed, but the constructor takes
3106 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3107 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3108 // - Avoid passing negative values which would result in really large stacks.
3109 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3110 size_t sz = size > 0 ? (size_t) size : 0;
3111 native_thread = new JavaThread(&thread_entry, sz);
3112
3113 // At this point it may be possible that no osthread was created for the
3114 // JavaThread due to lack of memory. Check for this situation and throw
3115 // an exception if necessary. Eventually we may want to change this so
3116 // that we only grab the lock if the thread was created successfully -
3117 // then we can also do this check and throw the exception in the
3118 // JavaThread constructor.
3119 if (native_thread->osthread() != nullptr) {
3120 // Note: the current thread is not being used within "prepare".
3121 native_thread->prepare(jthread);
3122 }
3123 }
3124 }
3125
3126 if (throw_illegal_thread_state) {
3127 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3128 }
3129
3130 assert(native_thread != nullptr, "Starting null thread?");
3131
3132 if (native_thread->osthread() == nullptr) {
3133 ResourceMark rm(thread);
3134 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3135 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3136 // No one should hold a reference to the 'native_thread'.
3137 native_thread->smr_delete();
3138 if (JvmtiExport::should_post_resource_exhausted()) {
3139 JvmtiExport::post_resource_exhausted(
3140 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3141 os::native_thread_creation_failed_msg());
3142 }
3143 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3144 os::native_thread_creation_failed_msg());
3145 }
3146
3147 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3148
3149 Thread::start(native_thread);
3150
3151 JVM_END
3152
3153
3154 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3155 ThreadsListHandle tlh(thread);
3156 oop java_thread = nullptr;
3157 JavaThread* receiver = nullptr;
3158 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3159 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3160
3161 if (is_alive) {
3162 // jthread refers to a live JavaThread.
3163 Thread::set_priority(receiver, (ThreadPriority)prio);
3164 }
3165 // Implied else: If the JavaThread hasn't started yet, then the
3166 // priority set in the java.lang.Thread object above will be pushed
3167 // down when it does start.
3168 JVM_END
3169
3170
3171 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3172 if (os::dont_yield()) return;
3173 HOTSPOT_THREAD_YIELD();
3174 os::naked_yield();
3175 JVM_END
3176
3177 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3178 if (nanos < 0) {
3179 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3180 }
3181
3182 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3183 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3184 }
3185
3186 // Save current thread state and restore it at the end of this block.
3187 // And set new thread state to SLEEPING.
3188 JavaThreadSleepState jtss(thread);
3189
3190 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3191
3192 if (nanos == 0) {
3193 os::naked_yield();
3194 } else {
3195 ThreadState old_state = thread->osthread()->get_state();
3196 thread->osthread()->set_state(SLEEPING);
3197 if (!thread->sleep_nanos(nanos)) { // interrupted
3198 // An asynchronous exception could have been thrown on
3199 // us while we were sleeping. We do not overwrite those.
3200 if (!HAS_PENDING_EXCEPTION) {
3201 HOTSPOT_THREAD_SLEEP_END(1);
3202
3203 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3204 // to properly restore the thread state. That's likely wrong.
3205 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3206 }
3207 }
3208 thread->osthread()->set_state(old_state);
3209 }
3210 HOTSPOT_THREAD_SLEEP_END(0);
3211 JVM_END
3212
3213 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3214 oop jthread = thread->threadObj();
3215 assert(jthread != nullptr, "no current carrier thread!");
3216 return JNIHandles::make_local(THREAD, jthread);
3217 JVM_END
3218
3219 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3220 oop theThread = thread->vthread();
3221 assert(theThread != (oop)nullptr, "no current thread!");
3222 return JNIHandles::make_local(THREAD, theThread);
3223 JVM_END
3224
3225 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3226 jobject theThread))
3227 oop threadObj = JNIHandles::resolve(theThread);
3228 thread->set_vthread(threadObj);
3229 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3230 JVM_END
3231
3232 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3233 return ThreadIdentifier::unsafe_offset();
3234 JVM_END
3235
3236 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3237 ThreadsListHandle tlh(thread);
3238 JavaThread* receiver = nullptr;
3239 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3240 if (is_alive) {
3241 // jthread refers to a live JavaThread.
3242 receiver->interrupt();
3243 }
3244 JVM_END
3245
3246 // Return true iff the current thread has locked the object passed in
3247
3248 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3249 if (obj == nullptr) {
3250 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3251 }
3252 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3253 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3254 JVM_END
3255
3256 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3257 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3258 return JNIHandles::make_local(THREAD, trace);
3259 JVM_END
3260
3261 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3262 VM_PrintThreads op;
3263 VMThread::execute(&op);
3264 if (JvmtiExport::should_post_data_dump()) {
3265 JvmtiExport::post_data_dump();
3266 }
3267 JVM_END
3268
3269 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3270 // We don't use a ThreadsListHandle here because the current thread
3271 // must be alive.
3272 oop java_thread = JNIHandles::resolve_non_null(jthread);
3273 JavaThread* thr = java_lang_Thread::thread(java_thread);
3274 if (thread == thr && !thr->has_attached_via_jni()) {
3275 // Thread naming is only supported for the current thread and
3276 // we don't set the name of an attached thread to avoid stepping
3277 // on other programs.
3278 ResourceMark rm(thread);
3279 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3280 os::set_native_thread_name(thread_name);
3281 }
3282 JVM_END
3283
3284 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3285 oop theCache = thread->scopedValueCache();
3286 return JNIHandles::make_local(THREAD, theCache);
3287 JVM_END
3288
3289 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3290 jobject theCache))
3291 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3292 thread->set_scopedValueCache(objs);
3293 JVM_END
3294
3295 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3296
3297 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3298 ResourceMark rm(THREAD);
3299 JvmtiVMObjectAllocEventCollector oam;
3300 vframeStream vfst(thread);
3301
3302 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3303 // This must only be called from SecurityManager.getClassContext
3304 Method* m = vfst.method();
3305 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3306 m->name() == vmSymbols::getClassContext_name() &&
3307 m->signature() == vmSymbols::void_class_array_signature())) {
3308 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3309 }
3310 }
3311
3312 // Collect method holders
3313 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3314 for (; !vfst.at_end(); vfst.security_next()) {
3315 Method* m = vfst.method();
3316 // Native frames are not returned
3317 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3318 Klass* holder = m->method_holder();
3319 assert(holder->is_klass(), "just checking");
3320 klass_array->append(holder);
3321 }
3322 }
3323
3324 // Create result array of type [Ljava/lang/Class;
3325 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3326 // Fill in mirrors corresponding to method holders
3327 for (int i = 0; i < klass_array->length(); i++) {
3328 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3329 }
3330
3331 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3332 JVM_END
3333
3334
3335 // java.lang.Package ////////////////////////////////////////////////////////////////
3336
3337
3338 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3339 ResourceMark rm(THREAD);
3340 JvmtiVMObjectAllocEventCollector oam;
3341 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3342 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3343 return (jstring) JNIHandles::make_local(THREAD, result);
3344 JVM_END
3345
3346
3347 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3348 JvmtiVMObjectAllocEventCollector oam;
3349 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3350 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3351 JVM_END
3352
3353
3354 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3355
3356
3357 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3358 MonitorLocker ml(Heap_lock);
3359 oop ref = Universe::reference_pending_list();
3360 if (ref != nullptr) {
3361 Universe::clear_reference_pending_list();
3362 }
3363 return JNIHandles::make_local(THREAD, ref);
3364 JVM_END
3365
3366 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3367 MonitorLocker ml(Heap_lock);
3368 return Universe::has_reference_pending_list();
3369 JVM_END
3370
3371 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3372 MonitorLocker ml(Heap_lock);
3373 while (!Universe::has_reference_pending_list()) {
3374 ml.wait();
3375 }
3376 JVM_END
3377
3378 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3379 oop ref_oop = JNIHandles::resolve_non_null(ref);
3380 // PhantomReference has it's own implementation of refersTo().
3381 // See: JVM_PhantomReferenceRefersTo
3382 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3383 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3384 return referent == JNIHandles::resolve(o);
3385 JVM_END
3386
3387 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3388 oop ref_oop = JNIHandles::resolve_non_null(ref);
3389 // FinalReference has it's own implementation of clear().
3390 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3391 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3392 // If the referent has already been cleared then done.
3393 // However, if the referent is dead but has not yet been cleared by
3394 // concurrent reference processing, it should NOT be cleared here.
3395 // Instead, clearing should be left to the GC. Clearing it here could
3396 // detectably lose an expected notification, which is impossible with
3397 // STW reference processing. The clearing in enqueue() doesn't have
3398 // this problem, since the enqueue covers the notification, but it's not
3399 // worth the effort to handle that case specially.
3400 return;
3401 }
3402 java_lang_ref_Reference::clear_referent(ref_oop);
3403 JVM_END
3404
3405
3406 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3407
3408
3409 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3410 oop ref_oop = JNIHandles::resolve_non_null(ref);
3411 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3412 return referent == JNIHandles::resolve(o);
3413 JVM_END
3414
3415
3416 // ObjectInputStream ///////////////////////////////////////////////////////////////
3417
3418 // Return the first user-defined class loader up the execution stack, or null
3419 // if only code from the bootstrap or platform class loader is on the stack.
3420
3421 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3422 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3423 InstanceKlass* ik = vfst.method()->method_holder();
3424 oop loader = ik->class_loader();
3425 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3426 // Skip reflection related frames
3427 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
3428 return JNIHandles::make_local(THREAD, loader);
3429 }
3430 }
3431 }
3432 return nullptr;
3433 JVM_END
3434
3435
3436 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3437
3438
3439 // resolve array handle and check arguments
3440 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3441 if (arr == nullptr) {
3442 THROW_0(vmSymbols::java_lang_NullPointerException());
3443 }
3444 oop a = JNIHandles::resolve_non_null(arr);
3445 if (!a->is_array()) {
3446 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3447 } else if (type_array_only && !a->is_typeArray()) {
3448 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3449 }
3450 return arrayOop(a);
3451 }
3452
3453
3454 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3455 arrayOop a = check_array(env, arr, false, CHECK_0);
3456 return a->length();
3457 JVM_END
3458
3459
3460 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3461 JvmtiVMObjectAllocEventCollector oam;
3462 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3463 jvalue value;
3464 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3465 oop box = Reflection::box(&value, type, CHECK_NULL);
3466 return JNIHandles::make_local(THREAD, box);
3467 JVM_END
3468
3469
3470 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3471 jvalue value;
3472 value.i = 0; // to initialize value before getting used in CHECK
3473 arrayOop a = check_array(env, arr, true, CHECK_(value));
3474 assert(a->is_typeArray(), "just checking");
3475 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3476 BasicType wide_type = (BasicType) wCode;
3477 if (type != wide_type) {
3478 Reflection::widen(&value, type, wide_type, CHECK_(value));
3479 }
3480 return value;
3481 JVM_END
3482
3483
3484 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3485 arrayOop a = check_array(env, arr, false, CHECK);
3486 oop box = JNIHandles::resolve(val);
3487 jvalue value;
3488 value.i = 0; // to initialize value before getting used in CHECK
3489 BasicType value_type;
3490 if (a->is_objArray()) {
3491 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3492 value_type = Reflection::unbox_for_regular_object(box, &value);
3493 } else {
3494 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3495 }
3496 Reflection::array_set(&value, a, index, value_type, CHECK);
3497 JVM_END
3498
3499
3500 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3501 arrayOop a = check_array(env, arr, true, CHECK);
3502 assert(a->is_typeArray(), "just checking");
3503 BasicType value_type = (BasicType) vCode;
3504 Reflection::array_set(&v, a, index, value_type, CHECK);
3505 JVM_END
3506
3507
3508 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3509 JvmtiVMObjectAllocEventCollector oam;
3510 oop element_mirror = JNIHandles::resolve(eltClass);
3511 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3512 return JNIHandles::make_local(THREAD, result);
3513 JVM_END
3514
3515
3516 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3517 JvmtiVMObjectAllocEventCollector oam;
3518 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3519 oop element_mirror = JNIHandles::resolve(eltClass);
3520 assert(dim_array->is_typeArray(), "just checking");
3521 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3522 return JNIHandles::make_local(THREAD, result);
3523 JVM_END
3524
3525
3526 // Library support ///////////////////////////////////////////////////////////////////////////
3527
3528 JVM_LEAF(void*, JVM_LoadZipLibrary())
3529 return ZipLibrary::handle();
3530 JVM_END
3531
3532 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3533 //%note jvm_ct
3534 char ebuf[1024];
3535 void *load_result;
3536 {
3537 ThreadToNativeFromVM ttnfvm(thread);
3538 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3539 }
3540 if (load_result == nullptr) {
3541 if (throwException) {
3542 char msg[1024];
3543 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3544 // Since 'ebuf' may contain a string encoded using
3545 // platform encoding scheme, we need to pass
3546 // Exceptions::unsafe_to_utf8 to the new_exception method
3547 // as the last argument. See bug 6367357.
3548 Handle h_exception =
3549 Exceptions::new_exception(thread,
3550 vmSymbols::java_lang_UnsatisfiedLinkError(),
3551 msg, Exceptions::unsafe_to_utf8);
3552
3553 THROW_HANDLE_0(h_exception);
3554 } else {
3555 log_info(library)("Failed to load library %s", name);
3556 return load_result;
3557 }
3558 }
3559 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3560 return load_result;
3561 JVM_END
3562
3563
3564 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3565 os::dll_unload(handle);
3566 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3567 JVM_END
3568
3569
3570 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3571 void* find_result = os::dll_lookup(handle, name);
3572 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3573 find_result != nullptr ? "Found" : "Failed to find",
3574 name, p2i(handle));
3575 return find_result;
3576 JVM_END
3577
3578
3579 // JNI version ///////////////////////////////////////////////////////////////////////////////
3580
3581 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3582 return Threads::is_supported_jni_version_including_1_1(version);
3583 JVM_END
3584
3585
3586 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3587 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3588 JVM_END
3589
3590 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3591 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3592 JVM_END
3593
3594 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3595 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3596 JVM_END
3597
3598 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3599 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3600 JVM_END
3601
3602 // String support ///////////////////////////////////////////////////////////////////////////
3603
3604 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3605 JvmtiVMObjectAllocEventCollector oam;
3606 if (str == nullptr) return nullptr;
3607 oop string = JNIHandles::resolve_non_null(str);
3608 oop result = StringTable::intern(string, CHECK_NULL);
3609 return (jstring) JNIHandles::make_local(THREAD, result);
3610 JVM_END
3611
3612
3613 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3614
3615 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3616 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3617 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3618 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3619 // nature. JavaThreads will be "in native" when using this API from JDK code.
3620
3621
3622 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3623 VM_Exit::block_if_vm_exited();
3624 return new PlatformMutex();
3625 }
3626
3627
3628 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3629 VM_Exit::block_if_vm_exited();
3630 delete ((PlatformMutex*) mon);
3631 }
3632
3633
3634 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3635 VM_Exit::block_if_vm_exited();
3636 ((PlatformMutex*) mon)->lock();
3637 return 0;
3638 }
3639
3640
3641 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3642 VM_Exit::block_if_vm_exited();
3643 ((PlatformMutex*) mon)->unlock();
3644 }
3645
3646
3647 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3648
3649 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3650 Handle loader, Handle protection_domain,
3651 jboolean throwError, TRAPS) {
3652 // Security Note:
3653 // The Java level wrapper will perform the necessary security check allowing
3654 // us to pass the null as the initiating class loader. The VM is responsible for
3655 // the checkPackageAccess relative to the initiating class loader via the
3656 // protection_domain. The protection_domain is passed as null by the java code
3657 // if there is no security manager in 3-arg Class.forName().
3658 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3659
3660 // Check if we should initialize the class
3661 if (init && klass->is_instance_klass()) {
3662 klass->initialize(CHECK_NULL);
3663 }
3664 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3665 }
3666
3667
3668 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3669
3670 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3671 Handle method_handle;
3672 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3673 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3674 Handle receiver(THREAD, JNIHandles::resolve(obj));
3675 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3676 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3677 jobject res = JNIHandles::make_local(THREAD, result);
3678 if (JvmtiExport::should_post_vm_object_alloc()) {
3679 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3680 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3681 if (java_lang_Class::is_primitive(ret_type)) {
3682 // Only for primitive type vm allocates memory for java object.
3683 // See box() method.
3684 JvmtiExport::post_vm_object_alloc(thread, result);
3685 }
3686 }
3687 return res;
3688 } else {
3689 THROW_0(vmSymbols::java_lang_StackOverflowError());
3690 }
3691 JVM_END
3692
3693
3694 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3695 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3696 oop constructor_mirror = JNIHandles::resolve(c);
3697 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3698 jobject res = JNIHandles::make_local(THREAD, result);
3699 if (JvmtiExport::should_post_vm_object_alloc()) {
3700 JvmtiExport::post_vm_object_alloc(thread, result);
3701 }
3702 return res;
3703 JVM_END
3704
3705 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3706 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3707 assert(k->is_klass(), "just checking");
3708 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3709 JVM_END
3710
3711 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3712 jclass caller,
3713 jstring interfaceMethodName,
3714 jobject factoryType,
3715 jobject interfaceMethodType,
3716 jobject implementationMember,
3717 jobject dynamicMethodType,
3718 jclass lambdaProxyClass))
3719 #if INCLUDE_CDS
3720 if (!CDSConfig::is_dumping_archive()) {
3721 return;
3722 }
3723
3724 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3725 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3726 if (caller_ik->is_hidden()) {
3727 // Hidden classes not of type lambda proxy classes are currently not being archived.
3728 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3729 // registered for archiving.
3730 return;
3731 }
3732 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3733 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3734 assert(lambda_ik->is_hidden(), "must be a hidden class");
3735 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3736
3737 Symbol* interface_method_name = nullptr;
3738 if (interfaceMethodName != nullptr) {
3739 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3740 }
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 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3755 interface_method_type, m, dynamic_method_type, THREAD);
3756 #endif // INCLUDE_CDS
3757 JVM_END
3758
3759 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3760 jclass caller,
3761 jstring interfaceMethodName,
3762 jobject factoryType,
3763 jobject interfaceMethodType,
3764 jobject implementationMember,
3765 jobject dynamicMethodType))
3766 #if INCLUDE_CDS
3767
3768 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3769 implementationMember == nullptr || dynamicMethodType == nullptr) {
3770 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3771 }
3772
3773 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3774 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3775 if (!caller_ik->is_shared()) {
3776 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3777 return nullptr;
3778 }
3779
3780 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3781 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3782 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3783
3784 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3785 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3786
3787 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3788 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3789 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3790
3791 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3792 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3793
3794 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3795 interface_method_type, m, dynamic_method_type);
3796 jclass jcls = nullptr;
3797 if (lambda_ik != nullptr) {
3798 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3799 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3800 }
3801 return jcls;
3802 #else
3803 return nullptr;
3804 #endif // INCLUDE_CDS
3805 JVM_END
3806
3807 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3808 if (CDSConfig::is_dumping_static_archive()) {
3809 // We do this so that the default CDS archive can be deterministic.
3810 const char* release = VM_Version::vm_release();
3811 const char* dbg_level = VM_Version::jdk_debug_level();
3812 const char* version = VM_Version::internal_vm_info_string();
3813 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3814 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3815 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3816 seed += (jlong)VM_Version::vm_major_version();
3817 seed += (jlong)VM_Version::vm_minor_version();
3818 seed += (jlong)VM_Version::vm_security_version();
3819 seed += (jlong)VM_Version::vm_patch_version();
3820 if (seed == 0) { // don't let this ever be zero.
3821 seed = 0x87654321;
3822 }
3823 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3824 return seed;
3825 } else {
3826 return 0;
3827 }
3828 JVM_END
3829
3830 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3831 return CDSConfig::get_status();
3832 JVM_END
3833
3834 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3835 #if INCLUDE_CDS
3836 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3837 if (line != nullptr) {
3838 ResourceMark rm(THREAD);
3839 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3840 char* c_line = java_lang_String::as_utf8_string(h_line());
3841 if (CDSConfig::is_dumping_dynamic_archive()) {
3842 // Note: LambdaFormInvokers::append take same format which is not
3843 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3844 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3845 }
3846 if (ClassListWriter::is_enabled()) {
3847 ClassListWriter w;
3848 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3849 }
3850 }
3851 #endif // INCLUDE_CDS
3852 JVM_END
3853
3854 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3855 #if INCLUDE_CDS
3856 ResourceMark rm(THREAD);
3857 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3858 char* file_name = java_lang_String::as_utf8_string(file_handle());
3859 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3860 #endif // INCLUDE_CDS
3861 JVM_END
3862
3863 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3864 #if INCLUDE_CDS
3865 ResourceMark rm(THREAD);
3866 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3867 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3868 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3869 #endif // INCLUDE_CDS
3870 JVM_END
3871
3872 // Returns an array of all live Thread objects (VM internal JavaThreads,
3873 // jvmti agent threads, and JNI attaching threads are skipped)
3874 // See CR 6404306 regarding JNI attaching threads
3875 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3876 ResourceMark rm(THREAD);
3877 ThreadsListEnumerator tle(THREAD, false, false);
3878 JvmtiVMObjectAllocEventCollector oam;
3879
3880 int num_threads = tle.num_threads();
3881 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3882 objArrayHandle threads_ah(THREAD, r);
3883
3884 for (int i = 0; i < num_threads; i++) {
3885 Handle h = tle.get_threadObj(i);
3886 threads_ah->obj_at_put(i, h());
3887 }
3888
3889 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3890 JVM_END
3891
3892
3893 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3894 // Return StackTraceElement[][], each element is the stack trace of a thread in
3895 // the corresponding entry in the given threads array
3896 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3897 JvmtiVMObjectAllocEventCollector oam;
3898
3899 // Check if threads is null
3900 if (threads == nullptr) {
3901 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3902 }
3903
3904 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3905 objArrayHandle ah(THREAD, a);
3906 int num_threads = ah->length();
3907 // check if threads is non-empty array
3908 if (num_threads == 0) {
3909 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3910 }
3911
3912 // check if threads is not an array of objects of Thread class
3913 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3914 if (k != vmClasses::Thread_klass()) {
3915 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3916 }
3917
3918 ResourceMark rm(THREAD);
3919
3920 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3921 for (int i = 0; i < num_threads; i++) {
3922 oop thread_obj = ah->obj_at(i);
3923 instanceHandle h(THREAD, (instanceOop) thread_obj);
3924 thread_handle_array->append(h);
3925 }
3926
3927 // The JavaThread references in thread_handle_array are validated
3928 // in VM_ThreadDump::doit().
3929 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3930 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3931
3932 JVM_END
3933
3934 // JVM monitoring and management support
3935 JVM_LEAF(void*, JVM_GetManagement(jint version))
3936 return Management::get_jmm_interface(version);
3937 JVM_END
3938
3939 // com.sun.tools.attach.VirtualMachine agent properties support
3940 //
3941 // Initialize the agent properties with the properties maintained in the VM
3942 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3943 ResourceMark rm;
3944
3945 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3946
3947 PUTPROP(props, "sun.java.command", Arguments::java_command());
3948 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3949 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3950 return properties;
3951 JVM_END
3952
3953 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3954 {
3955 JvmtiVMObjectAllocEventCollector oam;
3956
3957 if (ofClass == nullptr) {
3958 return nullptr;
3959 }
3960 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3961 // Special handling for primitive objects
3962 if (java_lang_Class::is_primitive(mirror())) {
3963 return nullptr;
3964 }
3965 Klass* k = java_lang_Class::as_Klass(mirror());
3966 if (!k->is_instance_klass()) {
3967 return nullptr;
3968 }
3969 InstanceKlass* ik = InstanceKlass::cast(k);
3970 int encl_method_class_idx = ik->enclosing_method_class_index();
3971 if (encl_method_class_idx == 0) {
3972 return nullptr;
3973 }
3974 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3975 objArrayHandle dest(THREAD, dest_o);
3976 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3977 dest->obj_at_put(0, enc_k->java_mirror());
3978 int encl_method_method_idx = ik->enclosing_method_method_index();
3979 if (encl_method_method_idx != 0) {
3980 Symbol* sym = ik->constants()->symbol_at(
3981 extract_low_short_from_int(
3982 ik->constants()->name_and_type_at(encl_method_method_idx)));
3983 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3984 dest->obj_at_put(1, str());
3985 sym = ik->constants()->symbol_at(
3986 extract_high_short_from_int(
3987 ik->constants()->name_and_type_at(encl_method_method_idx)));
3988 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3989 dest->obj_at_put(2, str());
3990 }
3991 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3992 }
3993 JVM_END
3994
3995 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3996 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3997 ResourceMark rm(THREAD);
3998
3999 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
4000 return nullptr;
4001 }
4002
4003 char** vm_flags = Arguments::jvm_flags_array();
4004 char** vm_args = Arguments::jvm_args_array();
4005 int num_flags = Arguments::num_jvm_flags();
4006 int num_args = Arguments::num_jvm_args();
4007
4008 InstanceKlass* ik = vmClasses::String_klass();
4009 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
4010 objArrayHandle result_h(THREAD, r);
4011
4012 int index = 0;
4013 for (int j = 0; j < num_flags; j++, index++) {
4014 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
4015 result_h->obj_at_put(index, h());
4016 }
4017 for (int i = 0; i < num_args; i++, index++) {
4018 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
4019 result_h->obj_at_put(index, h());
4020 }
4021 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
4022 JVM_END
4023
4024 JVM_LEAF(jint, JVM_FindSignal(const char *name))
4025 return os::get_signal_number(name);
4026 JVM_END
4027
4028 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
4029 #if INCLUDE_JVMTI
4030 if (!DoJVMTIVirtualThreadTransitions) {
4031 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4032 return;
4033 }
4034 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4035 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
4036 } else {
4037 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4038 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
4039 }
4040 #endif
4041 JVM_END
4042
4043 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
4044 #if INCLUDE_JVMTI
4045 if (!DoJVMTIVirtualThreadTransitions) {
4046 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4047 return;
4048 }
4049 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4050 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
4051 } else {
4052 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4053 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
4054 }
4055 #endif
4056 JVM_END
4057
4058 // If notifications are disabled then just update the VTMS transition bit and return.
4059 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
4060 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
4061 #if INCLUDE_JVMTI
4062 if (!DoJVMTIVirtualThreadTransitions) {
4063 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4064 return;
4065 }
4066 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4067 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
4068 } else {
4069 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4070 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4071 }
4072 #endif
4073 JVM_END
4074
4075 // If notifications are disabled then just update the VTMS transition bit and return.
4076 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
4077 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
4078 #if INCLUDE_JVMTI
4079 if (!DoJVMTIVirtualThreadTransitions) {
4080 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4081 return;
4082 }
4083 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4084 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
4085 } else {
4086 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4087 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4088 }
4089 #endif
4090 JVM_END
4091
4092 // Always update the temporary VTMS transition bit.
4093 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jclass clazz, jboolean hide))
4094 #if INCLUDE_JVMTI
4095 if (!DoJVMTIVirtualThreadTransitions) {
4096 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4097 return;
4098 }
4099 assert(!thread->is_in_VTMS_transition(), "sanity check");
4100 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
4101 thread->toggle_is_in_tmp_VTMS_transition();
4102 #endif
4103 JVM_END
4104
4105 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
4106 // Needed to avoid deadlocks with JVMTI suspend mechanism.
4107 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
4108 #if INCLUDE_JVMTI
4109 if (!DoJVMTIVirtualThreadTransitions) {
4110 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4111 return;
4112 }
4113 assert(thread->is_disable_suspend() != (bool)enter,
4114 "nested or unbalanced monitor enter/exit is not allowed");
4115 thread->toggle_is_disable_suspend();
4116 #endif
4117 JVM_END
4118
4119 /*
4120 * Return the current class's class file version. The low order 16 bits of the
4121 * returned jint contain the class's major version. The high order 16 bits
4122 * contain the class's minor version.
4123 */
4124 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4125 oop mirror = JNIHandles::resolve_non_null(current);
4126 if (java_lang_Class::is_primitive(mirror)) {
4127 // return latest major version and minor version of 0.
4128 return JVM_CLASSFILE_MAJOR_VERSION;
4129 }
4130 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4131
4132 Klass* c = java_lang_Class::as_Klass(mirror);
4133 assert(c->is_instance_klass(), "must be");
4134 InstanceKlass* ik = InstanceKlass::cast(c);
4135 return (ik->minor_version() << 16) | ik->major_version();
4136 JVM_END
4137
4138 /*
4139 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4140 * get the value will see a materialized value and not a scalar-replaced
4141 * null value.
4142 */
4143 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4144 JVM_EnsureMaterializedForStackWalk(env, value);
4145 JVM_END
4146
4147 /*
4148 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4149 */
4150 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4151 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4152 JVM_END