1 /*
2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/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 annotated with @ImplicitlyConstructible");
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_inline_klass() ||
724 (klass->is_instance_klass() &&
725 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
726 ResourceMark rm(THREAD);
727 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
728 }
729
730 // Make shallow object copy
731 const size_t size = obj->size();
732 oop new_obj_oop = nullptr;
733 if (obj->is_array()) {
734 const int length = ((arrayOop)obj())->length();
735 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
736 /* do_zero */ true, CHECK_NULL);
737 } else {
738 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
739 }
740
741 HeapAccess<>::clone(obj(), new_obj_oop, size);
742
743 Handle new_obj(THREAD, new_obj_oop);
744 // Caution: this involves a java upcall, so the clone should be
745 // "gc-robust" by this stage.
746 if (klass->has_finalizer()) {
747 assert(obj->is_instance(), "should be instanceOop");
748 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
749 new_obj = Handle(THREAD, new_obj_oop);
750 }
751
752 return JNIHandles::make_local(THREAD, new_obj());
753 JVM_END
754
755 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
756
757 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
758 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
759 JVM_END
760
761 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
762 return InstanceKlass::is_finalization_enabled();
763 JVM_END
764
765 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
766
767 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
768 CONT_RegisterNativeMethods(env, cls);
769 JVM_END
770
771 // java.io.File ///////////////////////////////////////////////////////////////
772
773 JVM_LEAF(char*, JVM_NativePath(char* path))
774 return os::native_path(path);
775 JVM_END
776
777
778 // Misc. class handling ///////////////////////////////////////////////////////////
779
780
781 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
782 // Getting the class of the caller frame.
783 //
784 // The call stack at this point looks something like this:
785 //
786 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
787 // [1] [ @CallerSensitive API.method ]
788 // [.] [ (skipped intermediate frames) ]
789 // [n] [ caller ]
790 vframeStream vfst(thread);
791 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
792 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
793 Method* m = vfst.method();
794 assert(m != nullptr, "sanity");
795 switch (n) {
796 case 0:
797 // This must only be called from Reflection.getCallerClass
798 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
799 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
800 }
801 // fall-through
802 case 1:
803 // Frame 0 and 1 must be caller sensitive.
804 if (!m->caller_sensitive()) {
805 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
806 }
807 break;
808 default:
809 if (!m->is_ignored_by_security_stack_walk()) {
810 // We have reached the desired frame; return the holder class.
811 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
812 }
813 break;
814 }
815 }
816 return nullptr;
817 JVM_END
818
819
820 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
821 oop mirror = nullptr;
822 BasicType t = name2type(utf);
823 if (t != T_ILLEGAL && !is_reference_type(t)) {
824 mirror = Universe::java_mirror(t);
825 }
826 if (mirror == nullptr) {
827 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
828 } else {
829 return (jclass) JNIHandles::make_local(THREAD, mirror);
830 }
831 JVM_END
832
833
834 // Returns a class loaded by the bootstrap class loader; or null
835 // if not found. ClassNotFoundException is not thrown.
836 // FindClassFromBootLoader is exported to the launcher for windows.
837 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
838 const char* name))
839 // Java libraries should ensure that name is never null or illegal.
840 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
841 // It's impossible to create this class; the name cannot fit
842 // into the constant pool.
843 return nullptr;
844 }
845 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
846
847 TempNewSymbol h_name = SymbolTable::new_symbol(name);
848 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
849 if (k == nullptr) {
850 return nullptr;
851 }
852
853 if (log_is_enabled(Debug, class, resolve)) {
854 trace_class_resolution(k);
855 }
856 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
857 JVM_END
858
859 // Find a class with this name in this loader, using the caller's protection domain.
860 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
861 jboolean init, jobject loader,
862 jclass caller))
863 TempNewSymbol h_name =
864 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
865 CHECK_NULL);
866
867 oop loader_oop = JNIHandles::resolve(loader);
868 oop from_class = JNIHandles::resolve(caller);
869 oop protection_domain = nullptr;
870 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
871 // NPE. Put it in another way, the bootstrap class loader has all permission and
872 // thus no checkPackageAccess equivalence in the VM class loader.
873 // The caller is also passed as null by the java code if there is no security
874 // manager to avoid the performance cost of getting the calling class.
875 if (from_class != nullptr && loader_oop != nullptr) {
876 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
877 }
878
879 Handle h_loader(THREAD, loader_oop);
880 Handle h_prot(THREAD, protection_domain);
881 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
882 h_prot, false, THREAD);
883
884 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
885 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
886 }
887 return result;
888 JVM_END
889
890 // Currently only called from the old verifier.
891 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
892 jboolean init, jclass from))
893 TempNewSymbol h_name =
894 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
895 CHECK_NULL);
896 oop from_class_oop = JNIHandles::resolve(from);
897 Klass* from_class = (from_class_oop == nullptr)
898 ? (Klass*)nullptr
899 : java_lang_Class::as_Klass(from_class_oop);
900 oop class_loader = nullptr;
901 oop protection_domain = nullptr;
902 if (from_class != nullptr) {
903 class_loader = from_class->class_loader();
904 protection_domain = from_class->protection_domain();
905 }
906 Handle h_loader(THREAD, class_loader);
907 Handle h_prot (THREAD, protection_domain);
908 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
909 h_prot, true, thread);
910
911 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
912 // this function is generally only used for class loading during verification.
913 ResourceMark rm;
914 oop from_mirror = JNIHandles::resolve_non_null(from);
915 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
916 const char * from_name = from_class->external_name();
917
918 oop mirror = JNIHandles::resolve_non_null(result);
919 Klass* to_class = java_lang_Class::as_Klass(mirror);
920 const char * to = to_class->external_name();
921 log_debug(class, resolve)("%s %s (verification)", from_name, to);
922 }
923
924 return result;
925 JVM_END
926
927 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
928 static jclass jvm_define_class_common(const char *name,
929 jobject loader, const jbyte *buf,
930 jsize len, jobject pd, const char *source,
931 TRAPS) {
932 if (source == nullptr) source = "__JVM_DefineClass__";
933
934 JavaThread* jt = THREAD;
935
936 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
937 ClassLoader::perf_define_appclass_selftime(),
938 ClassLoader::perf_define_appclasses(),
939 jt->get_thread_stat()->perf_recursion_counts_addr(),
940 jt->get_thread_stat()->perf_timers_addr(),
941 PerfClassTraceTime::DEFINE_CLASS);
942
943 if (UsePerfData) {
944 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
945 }
946
947 // Class resolution will get the class name from the .class stream if the name is null.
948 TempNewSymbol class_name = name == nullptr ? nullptr :
949 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
950 CHECK_NULL);
951
952 ResourceMark rm(THREAD);
953 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
954 Handle class_loader (THREAD, JNIHandles::resolve(loader));
955 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
956 ClassLoadInfo cl_info(protection_domain);
957 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
958 class_loader,
959 cl_info,
960 CHECK_NULL);
961
962 if (log_is_enabled(Debug, class, resolve)) {
963 trace_class_resolution(k);
964 }
965
966 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
967 }
968
969 enum {
970 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
971 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
972 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
973 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
974 };
975
976 /*
977 * Define a class with the specified flags that indicates if it's a nestmate,
978 * hidden, or strongly referenced from class loader.
979 */
980 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
981 const jbyte *buf, jsize len, jobject pd,
982 jboolean init, int flags, jobject classData, TRAPS) {
983 ResourceMark rm(THREAD);
984
985 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
986 // Lookup class must be a non-null instance
987 if (lookup_k == nullptr) {
988 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
989 }
990 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
991
992 Handle class_loader (THREAD, lookup_k->class_loader());
993
994 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
995 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
996 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
997 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
998
999 InstanceKlass* host_class = nullptr;
1000 if (is_nestmate) {
1001 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1002 }
1003
1004 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1005 name,
1006 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1007 is_nestmate ? host_class->external_name() : "",
1008 is_hidden ? "hidden" : "not hidden",
1009 is_strong ? "strong" : "weak",
1010 vm_annotations ? "with vm annotations" : "without vm annotation");
1011
1012 if (!is_hidden) {
1013 // classData is only applicable for hidden classes
1014 if (classData != nullptr) {
1015 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1016 }
1017 if (is_nestmate) {
1018 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1019 }
1020 if (!is_strong) {
1021 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1022 }
1023 if (vm_annotations) {
1024 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1025 }
1026 if (flags != STRONG_LOADER_LINK) {
1027 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1028 err_msg("invalid flag 0x%x", flags));
1029 }
1030 }
1031
1032 // Class resolution will get the class name from the .class stream if the name is null.
1033 TempNewSymbol class_name = name == nullptr ? nullptr :
1034 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1035 CHECK_NULL);
1036
1037 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1038 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1039 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1040
1041 InstanceKlass* ik = nullptr;
1042 if (!is_hidden) {
1043 ClassLoadInfo cl_info(protection_domain);
1044 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1045 class_loader,
1046 cl_info,
1047 CHECK_NULL);
1048
1049 if (log_is_enabled(Debug, class, resolve)) {
1050 trace_class_resolution(ik);
1051 }
1052 } else { // hidden
1053 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1054 ClassLoadInfo cl_info(protection_domain,
1055 host_class,
1056 classData_h,
1057 is_hidden,
1058 is_strong,
1059 vm_annotations);
1060 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1061 class_loader,
1062 cl_info,
1063 CHECK_NULL);
1064
1065 // The hidden class loader data has been artificially been kept alive to
1066 // this point. The mirror and any instances of this class have to keep
1067 // it alive afterwards.
1068 ik->class_loader_data()->dec_keep_alive();
1069
1070 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1071 ModuleEntry* module = ik->module();
1072 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1073 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1074 module_name,
1075 ik->external_name(),
1076 host_class->external_name(),
1077 ik->is_hidden() ? "is hidden" : "is not hidden");
1078 }
1079 }
1080
1081 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1082 // non-hidden class or nestmate class must be in the same package as the Lookup class
1083 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1084 }
1085
1086 if (init) {
1087 ik->initialize(CHECK_NULL);
1088 } else {
1089 ik->link_class(CHECK_NULL);
1090 }
1091
1092 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1093 }
1094
1095 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1096 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1097 JVM_END
1098
1099 /*
1100 * Define a class with the specified lookup class.
1101 * lookup: Lookup class
1102 * name: the name of the class
1103 * buf: class bytes
1104 * len: length of class bytes
1105 * pd: protection domain
1106 * init: initialize the class
1107 * flags: properties of the class
1108 * classData: private static pre-initialized field
1109 */
1110 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1111 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1112
1113 if (lookup == nullptr) {
1114 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1115 }
1116
1117 assert(buf != nullptr, "buf must not be null");
1118
1119 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1120 JVM_END
1121
1122 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1123
1124 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1125 JVM_END
1126
1127 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1128 ResourceMark rm(THREAD);
1129
1130 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1131 char* str = java_lang_String::as_utf8_string(h_name());
1132
1133 // Sanity check, don't expect null
1134 if (str == nullptr) return nullptr;
1135
1136 // Internalize the string, converting '.' to '/' in string.
1137 char* p = (char*)str;
1138 while (*p != '\0') {
1139 if (*p == '.') {
1140 *p = '/';
1141 }
1142 p++;
1143 }
1144
1145 const int str_len = (int)(p - str);
1146 if (str_len > Symbol::max_length()) {
1147 // It's impossible to create this class; the name cannot fit
1148 // into the constant pool.
1149 return nullptr;
1150 }
1151 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1152
1153 // Security Note:
1154 // The Java level wrapper will perform the necessary security check allowing
1155 // us to pass the null as the initiating class loader.
1156 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1157 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1158 h_loader,
1159 Handle());
1160 #if INCLUDE_CDS
1161 if (k == nullptr) {
1162 // If the class is not already loaded, try to see if it's in the shared
1163 // archive for the current classloader (h_loader).
1164 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1165 }
1166 #endif
1167 return (k == nullptr) ? nullptr :
1168 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1169 JVM_END
1170
1171 // Module support //////////////////////////////////////////////////////////////////////////////
1172
1173 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1174 jstring location, jobjectArray packages))
1175 Handle h_module (THREAD, JNIHandles::resolve(module));
1176 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1177 JVM_END
1178
1179 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1180 Handle h_module (THREAD, JNIHandles::resolve(module));
1181 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1182 JVM_END
1183
1184 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1185 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1186 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1187 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1188 JVM_END
1189
1190 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1191 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1192 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1193 JVM_END
1194
1195 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1196 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1197 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1198 JVM_END
1199
1200 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1201 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1202 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1203 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1204 JVM_END
1205
1206 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1207 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1208 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1209 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1210 JVM_END
1211
1212 // Reflection support //////////////////////////////////////////////////////////////////////////////
1213
1214 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1215 assert (cls != nullptr, "illegal class");
1216 JvmtiVMObjectAllocEventCollector oam;
1217 ResourceMark rm(THREAD);
1218 HandleMark hm(THREAD);
1219 Handle java_class(THREAD, JNIHandles::resolve(cls));
1220 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1221 return (jstring) JNIHandles::make_local(THREAD, result);
1222 JVM_END
1223
1224
1225 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1226 JvmtiVMObjectAllocEventCollector oam;
1227 oop mirror = JNIHandles::resolve_non_null(cls);
1228
1229 // Special handling for primitive objects
1230 if (java_lang_Class::is_primitive(mirror)) {
1231 // Primitive objects does not have any interfaces
1232 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1233 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1234 }
1235
1236 Klass* klass = java_lang_Class::as_Klass(mirror);
1237 // Figure size of result array
1238 int size;
1239 if (klass->is_instance_klass()) {
1240 InstanceKlass* ik = InstanceKlass::cast(klass);
1241 size = ik->local_interfaces()->length();
1242 } else {
1243 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1244 size = 2;
1245 }
1246
1247 // Allocate result array
1248 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1249 objArrayHandle result (THREAD, r);
1250 // Fill in result
1251 if (klass->is_instance_klass()) {
1252 // Regular instance klass, fill in all local interfaces
1253 for (int index = 0; index < size; index++) {
1254 InstanceKlass* ik = InstanceKlass::cast(klass);
1255 Klass* k = ik->local_interfaces()->at(index);
1256 result->obj_at_put(index, k->java_mirror());
1257 }
1258 } else {
1259 // All arrays implement java.lang.Cloneable and java.io.Serializable
1260 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1261 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1262 }
1263 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1264 JVM_END
1265
1266
1267 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1268 oop mirror = JNIHandles::resolve_non_null(cls);
1269 if (java_lang_Class::is_primitive(mirror)) {
1270 return JNI_FALSE;
1271 }
1272 Klass* k = java_lang_Class::as_Klass(mirror);
1273 jboolean result = k->is_interface();
1274 assert(!result || k->is_instance_klass(),
1275 "all interfaces are instance types");
1276 // The compiler intrinsic for isInterface tests the
1277 // Klass::_access_flags bits in the same way.
1278 return result;
1279 JVM_END
1280
1281 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1282 oop mirror = JNIHandles::resolve_non_null(cls);
1283 if (java_lang_Class::is_primitive(mirror)) {
1284 return JNI_FALSE;
1285 }
1286 Klass* k = java_lang_Class::as_Klass(mirror);
1287 return k->is_hidden();
1288 JVM_END
1289
1290 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls))
1291 oop mirror = JNIHandles::resolve_non_null(cls);
1292 if (java_lang_Class::is_primitive(mirror)) {
1293 return JNI_FALSE;
1294 }
1295 Klass* k = java_lang_Class::as_Klass(mirror);
1296 if (EnableValhalla) {
1297 return k->is_array_klass() || k->is_identity_class();
1298 } else {
1299 return k->is_interface() ? JNI_FALSE : JNI_TRUE;
1300 }
1301 JVM_END
1302
1303 JVM_ENTRY(jboolean, JVM_IsImplicitlyConstructibleClass(JNIEnv *env, jclass cls))
1304 oop mirror = JNIHandles::resolve_non_null(cls);
1305 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1306 return ik->is_implicitly_constructible();
1307 JVM_END
1308
1309 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1310 JvmtiVMObjectAllocEventCollector oam;
1311 oop mirror = JNIHandles::resolve_non_null(cls);
1312 if (java_lang_Class::is_primitive(mirror)) {
1313 // There are no signers for primitive types
1314 return nullptr;
1315 }
1316
1317 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1318
1319 // If there are no signers set in the class, or if the class
1320 // is an array, return null.
1321 if (signers == nullptr) return nullptr;
1322
1323 // copy of the signers array
1324 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1325 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1326 for (int index = 0; index < signers->length(); index++) {
1327 signers_copy->obj_at_put(index, signers->obj_at(index));
1328 }
1329
1330 // return the copy
1331 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1332 JVM_END
1333
1334
1335 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1336 oop mirror = JNIHandles::resolve_non_null(cls);
1337 if (!java_lang_Class::is_primitive(mirror)) {
1338 // This call is ignored for primitive types and arrays.
1339 // Signers are only set once, ClassLoader.java, and thus shouldn't
1340 // be called with an array. Only the bootstrap loader creates arrays.
1341 Klass* k = java_lang_Class::as_Klass(mirror);
1342 if (k->is_instance_klass()) {
1343 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1344 }
1345 }
1346 JVM_END
1347
1348
1349 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1350 oop mirror = JNIHandles::resolve_non_null(cls);
1351 if (mirror == nullptr) {
1352 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1353 }
1354
1355 if (java_lang_Class::is_primitive(mirror)) {
1356 // Primitive types does not have a protection domain.
1357 return nullptr;
1358 }
1359
1360 oop pd = java_lang_Class::protection_domain(mirror);
1361 return (jobject) JNIHandles::make_local(THREAD, pd);
1362 JVM_END
1363
1364
1365 // Returns the inherited_access_control_context field of the running thread.
1366 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1367 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1368 return JNIHandles::make_local(THREAD, result);
1369 JVM_END
1370
1371 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1372 if (!UsePrivilegedStack) return nullptr;
1373
1374 ResourceMark rm(THREAD);
1375 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1376 JvmtiVMObjectAllocEventCollector oam;
1377
1378 // count the protection domains on the execution stack. We collapse
1379 // duplicate consecutive protection domains into a single one, as
1380 // well as stopping when we hit a privileged frame.
1381
1382 oop previous_protection_domain = nullptr;
1383 Handle privileged_context(thread, nullptr);
1384 bool is_privileged = false;
1385 oop protection_domain = nullptr;
1386
1387 // Iterate through Java frames
1388 vframeStream vfst(thread);
1389 for(; !vfst.at_end(); vfst.next()) {
1390 // get method of frame
1391 Method* method = vfst.method();
1392
1393 // stop at the first privileged frame
1394 if (method->method_holder() == vmClasses::AccessController_klass() &&
1395 method->name() == vmSymbols::executePrivileged_name())
1396 {
1397 // this frame is privileged
1398 is_privileged = true;
1399
1400 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1401
1402 StackValueCollection* locals = priv->locals();
1403 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1404 StackValue* clr_sv = locals->at(2); // Class<?> caller
1405 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1406 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1407 privileged_context = ctx_sv->get_obj();
1408 Handle caller = clr_sv->get_obj();
1409
1410 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1411 protection_domain = caller_klass->protection_domain();
1412 } else {
1413 protection_domain = method->method_holder()->protection_domain();
1414 }
1415
1416 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1417 local_array->push(Handle(thread, protection_domain));
1418 previous_protection_domain = protection_domain;
1419 }
1420
1421 if (is_privileged) break;
1422 }
1423
1424
1425 // either all the domains on the stack were system domains, or
1426 // we had a privileged system domain
1427 if (local_array->is_empty()) {
1428 if (is_privileged && privileged_context.is_null()) return nullptr;
1429
1430 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1431 return JNIHandles::make_local(THREAD, result);
1432 }
1433
1434 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1435 local_array->length(), CHECK_NULL);
1436 objArrayHandle h_context(thread, context);
1437 for (int index = 0; index < local_array->length(); index++) {
1438 h_context->obj_at_put(index, local_array->at(index)());
1439 }
1440
1441 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1442
1443 return JNIHandles::make_local(THREAD, result);
1444 JVM_END
1445
1446 class ScopedValueBindingsResolver {
1447 public:
1448 InstanceKlass* Carrier_klass;
1449 ScopedValueBindingsResolver(JavaThread* THREAD) {
1450 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1451 Carrier_klass = InstanceKlass::cast(k);
1452 }
1453 };
1454
1455 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1456 ResourceMark rm(THREAD);
1457 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1458 JvmtiVMObjectAllocEventCollector oam;
1459
1460 static ScopedValueBindingsResolver resolver(THREAD);
1461
1462 // Iterate through Java frames
1463 vframeStream vfst(thread);
1464 for(; !vfst.at_end(); vfst.next()) {
1465 int loc = -1;
1466 // get method of frame
1467 Method* method = vfst.method();
1468
1469 Symbol *name = method->name();
1470
1471 InstanceKlass* holder = method->method_holder();
1472 if (name == vmSymbols::runWith_method_name()) {
1473 if (holder == vmClasses::Thread_klass()
1474 || holder == resolver.Carrier_klass) {
1475 loc = 1;
1476 }
1477 }
1478
1479 if (loc != -1) {
1480 javaVFrame *frame = vfst.asJavaVFrame();
1481 StackValueCollection* locals = frame->locals();
1482 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1483 Handle result = head_sv->get_obj();
1484 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1485 if (result() != nullptr) {
1486 return JNIHandles::make_local(THREAD, result());
1487 }
1488 }
1489 }
1490
1491 return nullptr;
1492 JVM_END
1493
1494 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1496 return (k != nullptr) && k->is_array_klass() ? true : false;
1497 JVM_END
1498
1499
1500 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1501 oop mirror = JNIHandles::resolve_non_null(cls);
1502 return (jboolean) java_lang_Class::is_primitive(mirror);
1503 JVM_END
1504
1505
1506 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1507 oop mirror = JNIHandles::resolve_non_null(cls);
1508 if (java_lang_Class::is_primitive(mirror)) {
1509 // Primitive type
1510 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1511 }
1512
1513 Klass* k = java_lang_Class::as_Klass(mirror);
1514 debug_only(int computed_modifiers = k->compute_modifier_flags());
1515 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1516 return k->modifier_flags();
1517 JVM_END
1518
1519
1520 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1521
1522 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1523 JvmtiVMObjectAllocEventCollector oam;
1524 // ofClass is a reference to a java_lang_Class object. The mirror object
1525 // of an InstanceKlass
1526 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1527 if (java_lang_Class::is_primitive(ofMirror) ||
1528 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1529 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1530 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1531 }
1532
1533 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1534 InnerClassesIterator iter(k);
1535
1536 if (iter.length() == 0) {
1537 // Neither an inner nor outer class
1538 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1539 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1540 }
1541
1542 // find inner class info
1543 constantPoolHandle cp(thread, k->constants());
1544 int length = iter.length();
1545
1546 // Allocate temp. result array
1547 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1548 objArrayHandle result (THREAD, r);
1549 int members = 0;
1550
1551 for (; !iter.done(); iter.next()) {
1552 int ioff = iter.inner_class_info_index();
1553 int ooff = iter.outer_class_info_index();
1554
1555 if (ioff != 0 && ooff != 0) {
1556 // Check to see if the name matches the class we're looking for
1557 // before attempting to find the class.
1558 if (cp->klass_name_at_matches(k, ooff)) {
1559 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1560 if (outer_klass == k) {
1561 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1562 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1563
1564 // Throws an exception if outer klass has not declared k as
1565 // an inner klass
1566 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1567
1568 result->obj_at_put(members, inner_klass->java_mirror());
1569 members++;
1570 }
1571 }
1572 }
1573 }
1574
1575 if (members != length) {
1576 // Return array of right length
1577 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1578 for(int i = 0; i < members; i++) {
1579 res->obj_at_put(i, result->obj_at(i));
1580 }
1581 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1582 }
1583
1584 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1585 JVM_END
1586
1587
1588 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1589 {
1590 // ofClass is a reference to a java_lang_Class object.
1591 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1592 if (java_lang_Class::is_primitive(ofMirror)) {
1593 return nullptr;
1594 }
1595 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1596 if (!klass->is_instance_klass()) {
1597 return nullptr;
1598 }
1599
1600 bool inner_is_member = false;
1601 Klass* outer_klass
1602 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1603 if (outer_klass == nullptr) return nullptr; // already a top-level class
1604 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1605 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1606 }
1607 JVM_END
1608
1609 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1610 {
1611 oop mirror = JNIHandles::resolve_non_null(cls);
1612 if (java_lang_Class::is_primitive(mirror)) {
1613 return nullptr;
1614 }
1615 Klass* klass = java_lang_Class::as_Klass(mirror);
1616 if (!klass->is_instance_klass()) {
1617 return nullptr;
1618 }
1619 InstanceKlass* k = InstanceKlass::cast(klass);
1620 int ooff = 0, noff = 0;
1621 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1622 if (noff != 0) {
1623 constantPoolHandle i_cp(thread, k->constants());
1624 Symbol* name = i_cp->symbol_at(noff);
1625 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1626 return (jstring) JNIHandles::make_local(THREAD, str());
1627 }
1628 }
1629 return nullptr;
1630 }
1631 JVM_END
1632
1633 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1634 assert (cls != nullptr, "illegal class");
1635 JvmtiVMObjectAllocEventCollector oam;
1636 ResourceMark rm(THREAD);
1637 oop mirror = JNIHandles::resolve_non_null(cls);
1638 // Return null for arrays and primitives
1639 if (!java_lang_Class::is_primitive(mirror)) {
1640 Klass* k = java_lang_Class::as_Klass(mirror);
1641 if (k->is_instance_klass()) {
1642 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1643 if (sym == nullptr) return nullptr;
1644 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1645 return (jstring) JNIHandles::make_local(THREAD, str());
1646 }
1647 }
1648 return nullptr;
1649 JVM_END
1650
1651
1652 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1653 assert (cls != nullptr, "illegal class");
1654 oop mirror = JNIHandles::resolve_non_null(cls);
1655 // Return null for arrays and primitives
1656 if (!java_lang_Class::is_primitive(mirror)) {
1657 Klass* k = java_lang_Class::as_Klass(mirror);
1658 if (k->is_instance_klass()) {
1659 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1660 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1661 }
1662 }
1663 return nullptr;
1664 JVM_END
1665
1666
1667 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1668 // some of this code was adapted from from jni_FromReflectedField
1669
1670 oop reflected = JNIHandles::resolve_non_null(field);
1671 oop mirror = java_lang_reflect_Field::clazz(reflected);
1672 Klass* k = java_lang_Class::as_Klass(mirror);
1673 int slot = java_lang_reflect_Field::slot(reflected);
1674 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1675
1676 InstanceKlass* ik = InstanceKlass::cast(k);
1677 int offset = ik->field_offset(slot);
1678
1679 if (modifiers & JVM_ACC_STATIC) {
1680 // for static fields we only look in the current class
1681 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1682 assert(false, "cannot find static field");
1683 return false;
1684 }
1685 } else {
1686 // for instance fields we start with the current class and work
1687 // our way up through the superclass chain
1688 if (!ik->find_field_from_offset(offset, false, &fd)) {
1689 assert(false, "cannot find instance field");
1690 return false;
1691 }
1692 }
1693 return true;
1694 }
1695
1696 static Method* jvm_get_method_common(jobject method) {
1697 // some of this code was adapted from from jni_FromReflectedMethod
1698
1699 oop reflected = JNIHandles::resolve_non_null(method);
1700 oop mirror = nullptr;
1701 int slot = 0;
1702
1703 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1704 mirror = java_lang_reflect_Constructor::clazz(reflected);
1705 slot = java_lang_reflect_Constructor::slot(reflected);
1706 } else {
1707 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1708 "wrong type");
1709 mirror = java_lang_reflect_Method::clazz(reflected);
1710 slot = java_lang_reflect_Method::slot(reflected);
1711 }
1712 Klass* k = java_lang_Class::as_Klass(mirror);
1713
1714 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1715 assert(m != nullptr, "cannot find method");
1716 return m; // caller has to deal with null in product mode
1717 }
1718
1719 /* Type use annotations support (JDK 1.8) */
1720
1721 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1722 assert (cls != nullptr, "illegal class");
1723 ResourceMark rm(THREAD);
1724 // Return null for arrays and primitives
1725 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1726 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1727 if (k->is_instance_klass()) {
1728 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1729 if (type_annotations != nullptr) {
1730 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1731 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1732 }
1733 }
1734 }
1735 return nullptr;
1736 JVM_END
1737
1738 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1739 assert (method != nullptr, "illegal method");
1740 // method is a handle to a java.lang.reflect.Method object
1741 Method* m = jvm_get_method_common(method);
1742 if (m == nullptr) {
1743 return nullptr;
1744 }
1745
1746 AnnotationArray* type_annotations = m->type_annotations();
1747 if (type_annotations != nullptr) {
1748 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1749 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1750 }
1751
1752 return nullptr;
1753 JVM_END
1754
1755 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1756 assert (field != nullptr, "illegal field");
1757 fieldDescriptor fd;
1758 bool gotFd = jvm_get_field_common(field, fd);
1759 if (!gotFd) {
1760 return nullptr;
1761 }
1762
1763 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1764 JVM_END
1765
1766 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1767 if (!cp->is_within_bounds(index)) {
1768 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1769 }
1770 }
1771
1772 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1773 {
1774 // method is a handle to a java.lang.reflect.Method object
1775 Method* method_ptr = jvm_get_method_common(method);
1776 methodHandle mh (THREAD, method_ptr);
1777 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1778 const int num_params = mh->method_parameters_length();
1779
1780 if (num_params < 0) {
1781 // A -1 return value from method_parameters_length means there is no
1782 // parameter data. Return null to indicate this to the reflection
1783 // API.
1784 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1785 return (jobjectArray)nullptr;
1786 } else {
1787 // Otherwise, we return something up to reflection, even if it is
1788 // a zero-length array. Why? Because in some cases this can
1789 // trigger a MalformedParametersException.
1790
1791 // make sure all the symbols are properly formatted
1792 for (int i = 0; i < num_params; i++) {
1793 MethodParametersElement* params = mh->method_parameters_start();
1794 int index = params[i].name_cp_index;
1795 constantPoolHandle cp(THREAD, mh->constants());
1796 bounds_check(cp, index, CHECK_NULL);
1797
1798 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1799 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1800 "Wrong type at constant pool index");
1801 }
1802
1803 }
1804
1805 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1806 objArrayHandle result (THREAD, result_oop);
1807
1808 for (int i = 0; i < num_params; i++) {
1809 MethodParametersElement* params = mh->method_parameters_start();
1810 // For a 0 index, give a null symbol
1811 Symbol* sym = 0 != params[i].name_cp_index ?
1812 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1813 int flags = params[i].flags;
1814 oop param = Reflection::new_parameter(reflected_method, i, sym,
1815 flags, CHECK_NULL);
1816 result->obj_at_put(i, param);
1817 }
1818 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1819 }
1820 }
1821 JVM_END
1822
1823 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1824
1825 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1826 {
1827 JvmtiVMObjectAllocEventCollector oam;
1828
1829 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1830 // Exclude primitive types and array types
1831 if (java_lang_Class::is_primitive(ofMirror) ||
1832 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1833 // Return empty array
1834 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1835 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1836 }
1837
1838 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1839 constantPoolHandle cp(THREAD, k->constants());
1840
1841 // Ensure class is linked
1842 k->link_class(CHECK_NULL);
1843
1844 // Allocate result
1845 int num_fields;
1846
1847 if (publicOnly) {
1848 num_fields = 0;
1849 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1850 if (fs.access_flags().is_public()) ++num_fields;
1851 }
1852 } else {
1853 num_fields = k->java_fields_count();
1854 }
1855
1856 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1857 objArrayHandle result (THREAD, r);
1858
1859 int out_idx = 0;
1860 fieldDescriptor fd;
1861 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1862 if (!publicOnly || fs.access_flags().is_public()) {
1863 fd.reinitialize(k, fs.index());
1864 oop field = Reflection::new_field(&fd, CHECK_NULL);
1865 result->obj_at_put(out_idx, field);
1866 ++out_idx;
1867 }
1868 }
1869 assert(out_idx == num_fields, "just checking");
1870 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1871 }
1872 JVM_END
1873
1874 // A class is a record if and only if it is final and a direct subclass of
1875 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1876 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1877 {
1878 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1879 if (k != nullptr && k->is_instance_klass()) {
1880 InstanceKlass* ik = InstanceKlass::cast(k);
1881 return ik->is_record();
1882 } else {
1883 return false;
1884 }
1885 }
1886 JVM_END
1887
1888 // Returns an array containing the components of the Record attribute,
1889 // or null if the attribute is not present.
1890 //
1891 // Note that this function returns the components of the Record attribute
1892 // even if the class is not a record.
1893 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1894 {
1895 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1896 assert(c->is_instance_klass(), "must be");
1897 InstanceKlass* ik = InstanceKlass::cast(c);
1898
1899 Array<RecordComponent*>* components = ik->record_components();
1900 if (components != nullptr) {
1901 JvmtiVMObjectAllocEventCollector oam;
1902 constantPoolHandle cp(THREAD, ik->constants());
1903 int length = components->length();
1904 assert(length >= 0, "unexpected record_components length");
1905 objArrayOop record_components =
1906 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1907 objArrayHandle components_h (THREAD, record_components);
1908
1909 for (int x = 0; x < length; x++) {
1910 RecordComponent* component = components->at(x);
1911 assert(component != nullptr, "unexpected null record component");
1912 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1913 components_h->obj_at_put(x, component_oop);
1914 }
1915 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1916 }
1917
1918 return nullptr;
1919 }
1920 JVM_END
1921
1922 static bool select_method(const methodHandle& method, bool want_constructor) {
1923 bool is_ctor = (method->is_object_constructor());
1924 if (want_constructor) {
1925 return is_ctor;
1926 } else {
1927 return (!is_ctor &&
1928 !method->is_class_initializer() &&
1929 !method->is_overpass());
1930 }
1931 }
1932
1933 static jobjectArray get_class_declared_methods_helper(
1934 JNIEnv *env,
1935 jclass ofClass, jboolean publicOnly,
1936 bool want_constructor,
1937 Klass* klass, TRAPS) {
1938
1939 JvmtiVMObjectAllocEventCollector oam;
1940
1941 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1942 // Exclude primitive types and array types
1943 if (java_lang_Class::is_primitive(ofMirror)
1944 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1945 // Return empty array
1946 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1947 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1948 }
1949
1950 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1951
1952 // Ensure class is linked
1953 k->link_class(CHECK_NULL);
1954
1955 Array<Method*>* methods = k->methods();
1956 int methods_length = methods->length();
1957
1958 // Save original method_idnum in case of redefinition, which can change
1959 // the idnum of obsolete methods. The new method will have the same idnum
1960 // but if we refresh the methods array, the counts will be wrong.
1961 ResourceMark rm(THREAD);
1962 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1963 int num_methods = 0;
1964
1965 for (int i = 0; i < methods_length; i++) {
1966 methodHandle method(THREAD, methods->at(i));
1967 if (select_method(method, want_constructor)) {
1968 if (!publicOnly || method->is_public()) {
1969 idnums->push(method->method_idnum());
1970 ++num_methods;
1971 }
1972 }
1973 }
1974
1975 // Allocate result
1976 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1977 objArrayHandle result (THREAD, r);
1978
1979 // Now just put the methods that we selected above, but go by their idnum
1980 // in case of redefinition. The methods can be redefined at any safepoint,
1981 // so above when allocating the oop array and below when creating reflect
1982 // objects.
1983 for (int i = 0; i < num_methods; i++) {
1984 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1985 if (method.is_null()) {
1986 // Method may have been deleted and seems this API can handle null
1987 // Otherwise should probably put a method that throws NSME
1988 result->obj_at_put(i, nullptr);
1989 } else {
1990 oop m;
1991 if (want_constructor) {
1992 assert(method->is_object_constructor(), "must be");
1993 m = Reflection::new_constructor(method, CHECK_NULL);
1994 } else {
1995 m = Reflection::new_method(method, false, CHECK_NULL);
1996 }
1997 result->obj_at_put(i, m);
1998 }
1999 }
2000
2001 return (jobjectArray) JNIHandles::make_local(THREAD, result());
2002 }
2003
2004 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2005 {
2006 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2007 /*want_constructor*/ false,
2008 vmClasses::reflect_Method_klass(), THREAD);
2009 }
2010 JVM_END
2011
2012 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2013 {
2014 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2015 /*want_constructor*/ true,
2016 vmClasses::reflect_Constructor_klass(), THREAD);
2017 }
2018 JVM_END
2019
2020 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2021 {
2022 oop mirror = JNIHandles::resolve_non_null(cls);
2023 if (java_lang_Class::is_primitive(mirror)) {
2024 // Primitive type
2025 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2026 }
2027
2028 Klass* k = java_lang_Class::as_Klass(mirror);
2029 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2030 }
2031 JVM_END
2032
2033 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2034 {
2035 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2036 assert(c->is_instance_klass(), "must be");
2037 InstanceKlass* ck = InstanceKlass::cast(c);
2038 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2039 assert(m->is_instance_klass(), "must be");
2040 InstanceKlass* mk = InstanceKlass::cast(m);
2041 return ck->has_nestmate_access_to(mk, THREAD);
2042 }
2043 JVM_END
2044
2045 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2046 {
2047 // current is not a primitive or array class
2048 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2049 assert(c->is_instance_klass(), "must be");
2050 InstanceKlass* ck = InstanceKlass::cast(c);
2051 InstanceKlass* host = ck->nest_host(THREAD);
2052 return (jclass) (host == nullptr ? nullptr :
2053 JNIHandles::make_local(THREAD, host->java_mirror()));
2054 }
2055 JVM_END
2056
2057 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2058 {
2059 // current is not a primitive or array class
2060 ResourceMark rm(THREAD);
2061 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2062 assert(c->is_instance_klass(), "must be");
2063 InstanceKlass* ck = InstanceKlass::cast(c);
2064 InstanceKlass* host = ck->nest_host(THREAD);
2065
2066 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2067 ck->external_name(), host->external_name());
2068 {
2069 JvmtiVMObjectAllocEventCollector oam;
2070 Array<u2>* members = host->nest_members();
2071 int length = members == nullptr ? 0 : members->length();
2072
2073 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2074
2075 // nest host is first in the array so make it one bigger
2076 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2077 length + 1, CHECK_NULL);
2078 objArrayHandle result(THREAD, r);
2079 result->obj_at_put(0, host->java_mirror());
2080 if (length != 0) {
2081 int count = 0;
2082 for (int i = 0; i < length; i++) {
2083 int cp_index = members->at(i);
2084 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2085 if (HAS_PENDING_EXCEPTION) {
2086 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2087 return nullptr; // propagate VMEs
2088 }
2089 if (log_is_enabled(Trace, class, nestmates)) {
2090 stringStream ss;
2091 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2092 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2093 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2094 log_trace(class, nestmates)("%s", ss.as_string());
2095 }
2096 CLEAR_PENDING_EXCEPTION;
2097 continue;
2098 }
2099 if (k->is_instance_klass()) {
2100 InstanceKlass* ik = InstanceKlass::cast(k);
2101 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2102 if (nest_host_k == host) {
2103 result->obj_at_put(count+1, k->java_mirror());
2104 count++;
2105 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2106 } else {
2107 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2108 ik->external_name(), nest_host_k->external_name());
2109 }
2110 } else {
2111 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2112 k->external_name());
2113 }
2114 }
2115 if (count < length) {
2116 // we had invalid entries so we need to compact the array
2117 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2118 length + 1, count + 1);
2119
2120 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2121 count + 1, CHECK_NULL);
2122 objArrayHandle result2(THREAD, r2);
2123 for (int i = 0; i < count + 1; i++) {
2124 result2->obj_at_put(i, result->obj_at(i));
2125 }
2126 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2127 }
2128 }
2129 else {
2130 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2131 }
2132 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2133 }
2134 }
2135 JVM_END
2136
2137 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2138 {
2139 oop mirror = JNIHandles::resolve_non_null(current);
2140 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2141 Klass* c = java_lang_Class::as_Klass(mirror);
2142 assert(c->is_instance_klass(), "must be");
2143 InstanceKlass* ik = InstanceKlass::cast(c);
2144 ResourceMark rm(THREAD);
2145 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2146 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2147 if (ik->is_sealed()) {
2148 JvmtiVMObjectAllocEventCollector oam;
2149 Array<u2>* subclasses = ik->permitted_subclasses();
2150 int length = subclasses->length();
2151
2152 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2153
2154 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2155 length, CHECK_NULL);
2156 objArrayHandle result(THREAD, r);
2157 int count = 0;
2158 for (int i = 0; i < length; i++) {
2159 int cp_index = subclasses->at(i);
2160 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2161 if (HAS_PENDING_EXCEPTION) {
2162 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2163 return nullptr; // propagate VMEs
2164 }
2165 if (log_is_enabled(Trace, class, sealed)) {
2166 stringStream ss;
2167 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2168 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2169 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2170 log_trace(class, sealed)("%s", ss.as_string());
2171 }
2172
2173 CLEAR_PENDING_EXCEPTION;
2174 continue;
2175 }
2176 if (k->is_instance_klass()) {
2177 result->obj_at_put(count++, k->java_mirror());
2178 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2179 }
2180 }
2181 if (count < length) {
2182 // we had invalid entries so we need to compact the array
2183 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2184 count, CHECK_NULL);
2185 objArrayHandle result2(THREAD, r2);
2186 for (int i = 0; i < count; i++) {
2187 result2->obj_at_put(i, result->obj_at(i));
2188 }
2189 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2190 }
2191 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2192 } else {
2193 return nullptr;
2194 }
2195 }
2196 JVM_END
2197
2198 // Constant pool access //////////////////////////////////////////////////////////
2199
2200 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2201 {
2202 JvmtiVMObjectAllocEventCollector oam;
2203 oop mirror = JNIHandles::resolve_non_null(cls);
2204 // Return null for primitives and arrays
2205 if (!java_lang_Class::is_primitive(mirror)) {
2206 Klass* k = java_lang_Class::as_Klass(mirror);
2207 if (k->is_instance_klass()) {
2208 InstanceKlass* k_h = InstanceKlass::cast(k);
2209 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2210 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2211 return JNIHandles::make_local(THREAD, jcp());
2212 }
2213 }
2214 return nullptr;
2215 }
2216 JVM_END
2217
2218
2219 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2220 {
2221 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2222 return cp->length();
2223 }
2224 JVM_END
2225
2226
2227 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2228 {
2229 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2230 bounds_check(cp, index, CHECK_NULL);
2231 constantTag tag = cp->tag_at(index);
2232 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2233 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2234 }
2235 Klass* k = cp->klass_at(index, CHECK_NULL);
2236 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2237 }
2238 JVM_END
2239
2240 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2241 {
2242 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2243 bounds_check(cp, index, CHECK_NULL);
2244 constantTag tag = cp->tag_at(index);
2245 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2246 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2247 }
2248 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2249 if (k == nullptr) return nullptr;
2250 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2251 }
2252 JVM_END
2253
2254 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2255 constantTag tag = cp->tag_at(index);
2256 if (!tag.is_method() && !tag.is_interface_method()) {
2257 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2258 }
2259 int klass_ref = cp->uncached_klass_ref_index_at(index);
2260 Klass* k_o;
2261 if (force_resolution) {
2262 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2263 } else {
2264 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2265 if (k_o == nullptr) return nullptr;
2266 }
2267 InstanceKlass* k = InstanceKlass::cast(k_o);
2268 Symbol* name = cp->uncached_name_ref_at(index);
2269 Symbol* sig = cp->uncached_signature_ref_at(index);
2270 methodHandle m (THREAD, k->find_method(name, sig));
2271 if (m.is_null()) {
2272 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2273 }
2274 oop method;
2275 if (m->is_object_constructor()) {
2276 method = Reflection::new_constructor(m, CHECK_NULL);
2277 } else {
2278 method = Reflection::new_method(m, true, CHECK_NULL);
2279 }
2280 return JNIHandles::make_local(THREAD, method);
2281 }
2282
2283 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2284 {
2285 JvmtiVMObjectAllocEventCollector oam;
2286 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2287 bounds_check(cp, index, CHECK_NULL);
2288 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2289 return res;
2290 }
2291 JVM_END
2292
2293 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2294 {
2295 JvmtiVMObjectAllocEventCollector oam;
2296 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2297 bounds_check(cp, index, CHECK_NULL);
2298 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2299 return res;
2300 }
2301 JVM_END
2302
2303 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2304 constantTag tag = cp->tag_at(index);
2305 if (!tag.is_field()) {
2306 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2307 }
2308 int klass_ref = cp->uncached_klass_ref_index_at(index);
2309 Klass* k_o;
2310 if (force_resolution) {
2311 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2312 } else {
2313 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2314 if (k_o == nullptr) return nullptr;
2315 }
2316 InstanceKlass* k = InstanceKlass::cast(k_o);
2317 Symbol* name = cp->uncached_name_ref_at(index);
2318 Symbol* sig = cp->uncached_signature_ref_at(index);
2319 fieldDescriptor fd;
2320 Klass* target_klass = k->find_field(name, sig, &fd);
2321 if (target_klass == nullptr) {
2322 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2323 }
2324 oop field = Reflection::new_field(&fd, CHECK_NULL);
2325 return JNIHandles::make_local(THREAD, field);
2326 }
2327
2328 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2329 {
2330 JvmtiVMObjectAllocEventCollector oam;
2331 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2332 bounds_check(cp, index, CHECK_NULL);
2333 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2334 return res;
2335 }
2336 JVM_END
2337
2338 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2339 {
2340 JvmtiVMObjectAllocEventCollector oam;
2341 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2342 bounds_check(cp, index, CHECK_NULL);
2343 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2344 return res;
2345 }
2346 JVM_END
2347
2348 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2349 {
2350 JvmtiVMObjectAllocEventCollector oam;
2351 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2352 bounds_check(cp, index, CHECK_NULL);
2353 constantTag tag = cp->tag_at(index);
2354 if (!tag.is_field_or_method()) {
2355 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2356 }
2357 int klass_ref = cp->uncached_klass_ref_index_at(index);
2358 Symbol* klass_name = cp->klass_name_at(klass_ref);
2359 Symbol* member_name = cp->uncached_name_ref_at(index);
2360 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2361 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2362 objArrayHandle dest(THREAD, dest_o);
2363 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2364 dest->obj_at_put(0, str());
2365 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2366 dest->obj_at_put(1, str());
2367 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2368 dest->obj_at_put(2, str());
2369 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2370 }
2371 JVM_END
2372
2373 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2374 {
2375 JvmtiVMObjectAllocEventCollector oam;
2376 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2377 bounds_check(cp, index, CHECK_0);
2378 constantTag tag = cp->tag_at(index);
2379 if (!tag.is_field_or_method()) {
2380 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2381 }
2382 return (jint) cp->uncached_klass_ref_index_at(index);
2383 }
2384 JVM_END
2385
2386 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2387 {
2388 JvmtiVMObjectAllocEventCollector oam;
2389 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2390 bounds_check(cp, index, CHECK_0);
2391 constantTag tag = cp->tag_at(index);
2392 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2393 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2394 }
2395 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2396 }
2397 JVM_END
2398
2399 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2400 {
2401 JvmtiVMObjectAllocEventCollector oam;
2402 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2403 bounds_check(cp, index, CHECK_NULL);
2404 constantTag tag = cp->tag_at(index);
2405 if (!tag.is_name_and_type()) {
2406 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2407 }
2408 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2409 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2410 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2411 objArrayHandle dest(THREAD, dest_o);
2412 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2413 dest->obj_at_put(0, str());
2414 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2415 dest->obj_at_put(1, str());
2416 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2417 }
2418 JVM_END
2419
2420 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2421 {
2422 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2423 bounds_check(cp, index, CHECK_0);
2424 constantTag tag = cp->tag_at(index);
2425 if (!tag.is_int()) {
2426 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2427 }
2428 return cp->int_at(index);
2429 }
2430 JVM_END
2431
2432 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2433 {
2434 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2435 bounds_check(cp, index, CHECK_(0L));
2436 constantTag tag = cp->tag_at(index);
2437 if (!tag.is_long()) {
2438 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2439 }
2440 return cp->long_at(index);
2441 }
2442 JVM_END
2443
2444 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2445 {
2446 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2447 bounds_check(cp, index, CHECK_(0.0f));
2448 constantTag tag = cp->tag_at(index);
2449 if (!tag.is_float()) {
2450 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2451 }
2452 return cp->float_at(index);
2453 }
2454 JVM_END
2455
2456 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2457 {
2458 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2459 bounds_check(cp, index, CHECK_(0.0));
2460 constantTag tag = cp->tag_at(index);
2461 if (!tag.is_double()) {
2462 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2463 }
2464 return cp->double_at(index);
2465 }
2466 JVM_END
2467
2468 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2469 {
2470 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2471 bounds_check(cp, index, CHECK_NULL);
2472 constantTag tag = cp->tag_at(index);
2473 if (!tag.is_string()) {
2474 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2475 }
2476 oop str = cp->string_at(index, CHECK_NULL);
2477 return (jstring) JNIHandles::make_local(THREAD, str);
2478 }
2479 JVM_END
2480
2481 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2482 {
2483 JvmtiVMObjectAllocEventCollector oam;
2484 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2485 bounds_check(cp, index, CHECK_NULL);
2486 constantTag tag = cp->tag_at(index);
2487 if (!tag.is_symbol()) {
2488 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2489 }
2490 Symbol* sym = cp->symbol_at(index);
2491 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2492 return (jstring) JNIHandles::make_local(THREAD, str());
2493 }
2494 JVM_END
2495
2496 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2497 {
2498 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2499 bounds_check(cp, index, CHECK_0);
2500 constantTag tag = cp->tag_at(index);
2501 jbyte result = tag.value();
2502 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2503 // they are changed to the corresponding tags from the JVM spec, so that java code in
2504 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2505 if (tag.is_klass_or_reference()) {
2506 result = JVM_CONSTANT_Class;
2507 } else if (tag.is_string_index()) {
2508 result = JVM_CONSTANT_String;
2509 } else if (tag.is_method_type_in_error()) {
2510 result = JVM_CONSTANT_MethodType;
2511 } else if (tag.is_method_handle_in_error()) {
2512 result = JVM_CONSTANT_MethodHandle;
2513 } else if (tag.is_dynamic_constant_in_error()) {
2514 result = JVM_CONSTANT_Dynamic;
2515 }
2516 return result;
2517 }
2518 JVM_END
2519
2520 // Assertion support. //////////////////////////////////////////////////////////
2521
2522 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2523 assert(cls != nullptr, "bad class");
2524
2525 oop r = JNIHandles::resolve(cls);
2526 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2527 if (java_lang_Class::is_primitive(r)) return false;
2528
2529 Klass* k = java_lang_Class::as_Klass(r);
2530 assert(k->is_instance_klass(), "must be an instance klass");
2531 if (!k->is_instance_klass()) return false;
2532
2533 ResourceMark rm(THREAD);
2534 const char* name = k->name()->as_C_string();
2535 bool system_class = k->class_loader() == nullptr;
2536 return JavaAssertions::enabled(name, system_class);
2537
2538 JVM_END
2539
2540
2541 // Return a new AssertionStatusDirectives object with the fields filled in with
2542 // command-line assertion arguments (i.e., -ea, -da).
2543 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2544 JvmtiVMObjectAllocEventCollector oam;
2545 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2546 return JNIHandles::make_local(THREAD, asd);
2547 JVM_END
2548
2549 // Arrays support /////////////////////////////////////////////////////////////
2550
2551 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2552 oop o = JNIHandles::resolve(array);
2553 Klass* k = o->klass();
2554 if ((o == nullptr) || (!k->is_array_klass())) {
2555 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2556 }
2557 return ArrayKlass::cast(k)->element_access_is_atomic();
2558 JVM_END
2559
2560 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2561 oop o = JNIHandles::resolve(array);
2562 Klass* k = o->klass();
2563 if ((o == nullptr) || (!k->is_array_klass())) {
2564 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2565 }
2566 if (k->is_flatArray_klass()) {
2567 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2568 if (!vk->element_access_is_atomic()) {
2569 /**
2570 * Need to decide how to implement:
2571 *
2572 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2573 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2574 * "checkcast" & "instanceof"
2575 *
2576 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2577 * possibly per instance lock structure. Said info, could be placed in
2578 * "trailer" rather than disturb the current arrayOop
2579 */
2580 Unimplemented();
2581 }
2582 }
2583 return array;
2584 JVM_END
2585
2586 // Verification ////////////////////////////////////////////////////////////////////////////////
2587
2588 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2589
2590 // RedefineClasses support: bug 6214132 caused verification to fail.
2591 // All functions from this section should call the jvmtiThreadSate function:
2592 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2593 // The function returns a Klass* of the _scratch_class if the verifier
2594 // was invoked in the middle of the class redefinition.
2595 // Otherwise it returns its argument value which is the _the_class Klass*.
2596 // Please, refer to the description in the jvmtiThreadSate.hpp.
2597
2598 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2599 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2600 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2601 return k->name()->as_utf8();
2602 JVM_END
2603
2604
2605 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2607 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2608 // types will have length zero if this is not an InstanceKlass
2609 // (length is determined by call to JVM_GetClassCPEntriesCount)
2610 if (k->is_instance_klass()) {
2611 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2612 for (int index = cp->length() - 1; index >= 0; index--) {
2613 constantTag tag = cp->tag_at(index);
2614 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2615 }
2616 }
2617 JVM_END
2618
2619
2620 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2622 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2623 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2624 JVM_END
2625
2626
2627 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2629 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2630 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2631 JVM_END
2632
2633
2634 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2637 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2638 JVM_END
2639
2640
2641 // The following methods, used for the verifier, are never called with
2642 // array klasses, so a direct cast to InstanceKlass is safe.
2643 // Typically, these methods are called in a loop with bounds determined
2644 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2645 // zero for arrays.
2646 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2647 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2648 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2649 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2650 int length = method->checked_exceptions_length();
2651 if (length > 0) {
2652 CheckedExceptionElement* table= method->checked_exceptions_start();
2653 for (int i = 0; i < length; i++) {
2654 exceptions[i] = table[i].class_cp_index;
2655 }
2656 }
2657 JVM_END
2658
2659
2660 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2661 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2662 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2663 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2664 return method->checked_exceptions_length();
2665 JVM_END
2666
2667
2668 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2669 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2670 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2671 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2672 memcpy(code, method->code_base(), method->code_size());
2673 JVM_END
2674
2675
2676 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2678 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2679 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2680 return method->code_size();
2681 JVM_END
2682
2683
2684 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2685 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2686 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2687 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2688 ExceptionTable extable(method);
2689 entry->start_pc = extable.start_pc(entry_index);
2690 entry->end_pc = extable.end_pc(entry_index);
2691 entry->handler_pc = extable.handler_pc(entry_index);
2692 entry->catchType = extable.catch_type_index(entry_index);
2693 JVM_END
2694
2695
2696 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2699 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2700 return method->exception_table_length();
2701 JVM_END
2702
2703
2704 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2706 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2707 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2708 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2709 JVM_END
2710
2711
2712 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2713 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2714 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2715 return InstanceKlass::cast(k)->field_access_flags(field_index);
2716 JVM_END
2717
2718
2719 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2720 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2721 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2722 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2723 return method->max_locals();
2724 JVM_END
2725
2726
2727 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2728 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2729 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2730 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2731 return method->size_of_parameters();
2732 JVM_END
2733
2734
2735 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2736 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2737 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2738 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2739 return method->verifier_max_stack();
2740 JVM_END
2741
2742
2743 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2744 ResourceMark rm(THREAD);
2745 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2746 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2747 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2748 return method->is_object_constructor();
2749 JVM_END
2750
2751
2752 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2753 ResourceMark rm(THREAD);
2754 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2755 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2756 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2757 return method->is_overpass();
2758 JVM_END
2759
2760 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2761 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2762 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2763 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2764 return method->name()->as_utf8();
2765 JVM_END
2766
2767
2768 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2769 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2770 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2771 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2772 return method->signature()->as_utf8();
2773 JVM_END
2774
2775 /**
2776 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2777 * read entries in the constant pool. Since the old verifier always
2778 * works on a copy of the code, it will not see any rewriting that
2779 * may possibly occur in the middle of verification. So it is important
2780 * that nothing it calls tries to use the cpCache instead of the raw
2781 * constant pool, so we must use cp->uncached_x methods when appropriate.
2782 */
2783 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2784 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2785 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2786 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2787 switch (cp->tag_at(cp_index).value()) {
2788 case JVM_CONSTANT_Fieldref:
2789 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2790 default:
2791 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2792 }
2793 ShouldNotReachHere();
2794 return nullptr;
2795 JVM_END
2796
2797
2798 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2799 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2800 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2801 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2802 switch (cp->tag_at(cp_index).value()) {
2803 case JVM_CONSTANT_InterfaceMethodref:
2804 case JVM_CONSTANT_Methodref:
2805 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2806 default:
2807 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2808 }
2809 ShouldNotReachHere();
2810 return nullptr;
2811 JVM_END
2812
2813
2814 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2815 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2816 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2817 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2818 switch (cp->tag_at(cp_index).value()) {
2819 case JVM_CONSTANT_InterfaceMethodref:
2820 case JVM_CONSTANT_Methodref:
2821 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2822 default:
2823 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2824 }
2825 ShouldNotReachHere();
2826 return nullptr;
2827 JVM_END
2828
2829
2830 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2831 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2832 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2833 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2834 switch (cp->tag_at(cp_index).value()) {
2835 case JVM_CONSTANT_Fieldref:
2836 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2837 default:
2838 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2839 }
2840 ShouldNotReachHere();
2841 return nullptr;
2842 JVM_END
2843
2844
2845 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2846 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2847 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2848 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2849 Symbol* classname = cp->klass_name_at(cp_index);
2850 return classname->as_utf8();
2851 JVM_END
2852
2853
2854 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2855 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2856 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2857 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2858 switch (cp->tag_at(cp_index).value()) {
2859 case JVM_CONSTANT_Fieldref: {
2860 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2861 Symbol* classname = cp->klass_name_at(class_index);
2862 return classname->as_utf8();
2863 }
2864 default:
2865 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2866 }
2867 ShouldNotReachHere();
2868 return nullptr;
2869 JVM_END
2870
2871
2872 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2873 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2874 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2875 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2876 switch (cp->tag_at(cp_index).value()) {
2877 case JVM_CONSTANT_Methodref:
2878 case JVM_CONSTANT_InterfaceMethodref: {
2879 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2880 Symbol* classname = cp->klass_name_at(class_index);
2881 return classname->as_utf8();
2882 }
2883 default:
2884 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2885 }
2886 ShouldNotReachHere();
2887 return nullptr;
2888 JVM_END
2889
2890
2891 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2892 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2893 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2894 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2895 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2896 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2897 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2898 switch (cp->tag_at(cp_index).value()) {
2899 case JVM_CONSTANT_Fieldref: {
2900 Symbol* name = cp->uncached_name_ref_at(cp_index);
2901 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2902 InstanceKlass* ik = InstanceKlass::cast(k_called);
2903 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2904 if (fs.name() == name && fs.signature() == signature) {
2905 return fs.access_flags().as_short();
2906 }
2907 }
2908 return -1;
2909 }
2910 default:
2911 fatal("JVM_GetCPFieldModifiers: illegal constant");
2912 }
2913 ShouldNotReachHere();
2914 return 0;
2915 JVM_END
2916
2917
2918 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2919 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2920 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2921 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2922 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2923 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2924 switch (cp->tag_at(cp_index).value()) {
2925 case JVM_CONSTANT_Methodref:
2926 case JVM_CONSTANT_InterfaceMethodref: {
2927 Symbol* name = cp->uncached_name_ref_at(cp_index);
2928 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2929 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2930 int methods_count = methods->length();
2931 for (int i = 0; i < methods_count; i++) {
2932 Method* method = methods->at(i);
2933 if (method->name() == name && method->signature() == signature) {
2934 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2935 }
2936 }
2937 return -1;
2938 }
2939 default:
2940 fatal("JVM_GetCPMethodModifiers: illegal constant");
2941 }
2942 ShouldNotReachHere();
2943 return 0;
2944 JVM_END
2945
2946
2947 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2948
2949 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2950 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2951 JVM_END
2952
2953
2954 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2955 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2956 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2957 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2958 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2959 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2960 JVM_END
2961
2962 // Printing support //////////////////////////////////////////////////
2963 extern "C" {
2964
2965 ATTRIBUTE_PRINTF(3, 0)
2966 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2967 // Reject count values that are negative signed values converted to
2968 // unsigned; see bug 4399518, 4417214
2969 if ((intptr_t)count <= 0) return -1;
2970
2971 int result = os::vsnprintf(str, count, fmt, args);
2972 if (result > 0 && (size_t)result >= count) {
2973 result = -1;
2974 }
2975
2976 return result;
2977 }
2978
2979 ATTRIBUTE_PRINTF(3, 4)
2980 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2981 va_list args;
2982 int len;
2983 va_start(args, fmt);
2984 len = jio_vsnprintf(str, count, fmt, args);
2985 va_end(args);
2986 return len;
2987 }
2988
2989 ATTRIBUTE_PRINTF(2, 3)
2990 int jio_fprintf(FILE* f, const char *fmt, ...) {
2991 int len;
2992 va_list args;
2993 va_start(args, fmt);
2994 len = jio_vfprintf(f, fmt, args);
2995 va_end(args);
2996 return len;
2997 }
2998
2999 ATTRIBUTE_PRINTF(2, 0)
3000 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
3001 if (Arguments::vfprintf_hook() != nullptr) {
3002 return Arguments::vfprintf_hook()(f, fmt, args);
3003 } else {
3004 return vfprintf(f, fmt, args);
3005 }
3006 }
3007
3008 ATTRIBUTE_PRINTF(1, 2)
3009 JNIEXPORT int jio_printf(const char *fmt, ...) {
3010 int len;
3011 va_list args;
3012 va_start(args, fmt);
3013 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
3014 va_end(args);
3015 return len;
3016 }
3017
3018 // HotSpot specific jio method
3019 void jio_print(const char* s, size_t len) {
3020 // Try to make this function as atomic as possible.
3021 if (Arguments::vfprintf_hook() != nullptr) {
3022 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
3023 } else {
3024 // Make an unused local variable to avoid warning from gcc compiler.
3025 bool dummy = os::write(defaultStream::output_fd(), s, len);
3026 }
3027 }
3028
3029 } // Extern C
3030
3031 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3032
3033 // In most of the JVM thread support functions we need to access the
3034 // thread through a ThreadsListHandle to prevent it from exiting and
3035 // being reclaimed while we try to operate on it. The exceptions to this
3036 // rule are when operating on the current thread, or if the monitor of
3037 // the target java.lang.Thread is locked at the Java level - in both
3038 // cases the target cannot exit.
3039
3040 static void thread_entry(JavaThread* thread, TRAPS) {
3041 HandleMark hm(THREAD);
3042 Handle obj(THREAD, thread->threadObj());
3043 JavaValue result(T_VOID);
3044 JavaCalls::call_virtual(&result,
3045 obj,
3046 vmClasses::Thread_klass(),
3047 vmSymbols::run_method_name(),
3048 vmSymbols::void_method_signature(),
3049 THREAD);
3050 }
3051
3052
3053 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3054 #if INCLUDE_CDS
3055 if (CDSConfig::is_dumping_static_archive()) {
3056 // During java -Xshare:dump, if we allow multiple Java threads to
3057 // execute in parallel, symbols and classes may be loaded in
3058 // random orders which will make the resulting CDS archive
3059 // non-deterministic.
3060 //
3061 // Lucikly, during java -Xshare:dump, it's important to run only
3062 // the code in the main Java thread (which is NOT started here) that
3063 // creates the module graph, etc. It's safe to not start the other
3064 // threads which are launched by class static initializers
3065 // (ReferenceHandler, FinalizerThread and CleanerImpl).
3066 if (log_is_enabled(Info, cds)) {
3067 ResourceMark rm;
3068 oop t = JNIHandles::resolve_non_null(jthread);
3069 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
3070 }
3071 return;
3072 }
3073 #endif
3074 JavaThread *native_thread = nullptr;
3075
3076 // We cannot hold the Threads_lock when we throw an exception,
3077 // due to rank ordering issues. Example: we might need to grab the
3078 // Heap_lock while we construct the exception.
3079 bool throw_illegal_thread_state = false;
3080
3081 // We must release the Threads_lock before we can post a jvmti event
3082 // in Thread::start.
3083 {
3084 // Ensure that the C++ Thread and OSThread structures aren't freed before
3085 // we operate.
3086 MutexLocker mu(Threads_lock);
3087
3088 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3089 // re-starting an already started thread, so we should usually find
3090 // that the JavaThread is null. However for a JNI attached thread
3091 // there is a small window between the Thread object being created
3092 // (with its JavaThread set) and the update to its threadStatus, so we
3093 // have to check for this
3094 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
3095 throw_illegal_thread_state = true;
3096 } else {
3097 jlong size =
3098 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3099 // Allocate the C++ Thread structure and create the native thread. The
3100 // stack size retrieved from java is 64-bit signed, but the constructor takes
3101 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3102 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3103 // - Avoid passing negative values which would result in really large stacks.
3104 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3105 size_t sz = size > 0 ? (size_t) size : 0;
3106 native_thread = new JavaThread(&thread_entry, sz);
3107
3108 // At this point it may be possible that no osthread was created for the
3109 // JavaThread due to lack of memory. Check for this situation and throw
3110 // an exception if necessary. Eventually we may want to change this so
3111 // that we only grab the lock if the thread was created successfully -
3112 // then we can also do this check and throw the exception in the
3113 // JavaThread constructor.
3114 if (native_thread->osthread() != nullptr) {
3115 // Note: the current thread is not being used within "prepare".
3116 native_thread->prepare(jthread);
3117 }
3118 }
3119 }
3120
3121 if (throw_illegal_thread_state) {
3122 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3123 }
3124
3125 assert(native_thread != nullptr, "Starting null thread?");
3126
3127 if (native_thread->osthread() == nullptr) {
3128 ResourceMark rm(thread);
3129 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3130 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3131 // No one should hold a reference to the 'native_thread'.
3132 native_thread->smr_delete();
3133 if (JvmtiExport::should_post_resource_exhausted()) {
3134 JvmtiExport::post_resource_exhausted(
3135 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3136 os::native_thread_creation_failed_msg());
3137 }
3138 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3139 os::native_thread_creation_failed_msg());
3140 }
3141
3142 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3143
3144 Thread::start(native_thread);
3145
3146 JVM_END
3147
3148
3149 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3150 ThreadsListHandle tlh(thread);
3151 oop java_thread = nullptr;
3152 JavaThread* receiver = nullptr;
3153 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3154 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3155
3156 if (is_alive) {
3157 // jthread refers to a live JavaThread.
3158 Thread::set_priority(receiver, (ThreadPriority)prio);
3159 }
3160 // Implied else: If the JavaThread hasn't started yet, then the
3161 // priority set in the java.lang.Thread object above will be pushed
3162 // down when it does start.
3163 JVM_END
3164
3165
3166 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3167 if (os::dont_yield()) return;
3168 HOTSPOT_THREAD_YIELD();
3169 os::naked_yield();
3170 JVM_END
3171
3172 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3173 if (nanos < 0) {
3174 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3175 }
3176
3177 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3178 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3179 }
3180
3181 // Save current thread state and restore it at the end of this block.
3182 // And set new thread state to SLEEPING.
3183 JavaThreadSleepState jtss(thread);
3184
3185 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3186
3187 if (nanos == 0) {
3188 os::naked_yield();
3189 } else {
3190 ThreadState old_state = thread->osthread()->get_state();
3191 thread->osthread()->set_state(SLEEPING);
3192 if (!thread->sleep_nanos(nanos)) { // interrupted
3193 // An asynchronous exception could have been thrown on
3194 // us while we were sleeping. We do not overwrite those.
3195 if (!HAS_PENDING_EXCEPTION) {
3196 HOTSPOT_THREAD_SLEEP_END(1);
3197
3198 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3199 // to properly restore the thread state. That's likely wrong.
3200 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3201 }
3202 }
3203 thread->osthread()->set_state(old_state);
3204 }
3205 HOTSPOT_THREAD_SLEEP_END(0);
3206 JVM_END
3207
3208 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3209 oop jthread = thread->threadObj();
3210 assert(jthread != nullptr, "no current carrier thread!");
3211 return JNIHandles::make_local(THREAD, jthread);
3212 JVM_END
3213
3214 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3215 oop theThread = thread->vthread();
3216 assert(theThread != (oop)nullptr, "no current thread!");
3217 return JNIHandles::make_local(THREAD, theThread);
3218 JVM_END
3219
3220 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3221 jobject theThread))
3222 oop threadObj = JNIHandles::resolve(theThread);
3223 thread->set_vthread(threadObj);
3224 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3225 JVM_END
3226
3227 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3228 return ThreadIdentifier::unsafe_offset();
3229 JVM_END
3230
3231 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3232 ThreadsListHandle tlh(thread);
3233 JavaThread* receiver = nullptr;
3234 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3235 if (is_alive) {
3236 // jthread refers to a live JavaThread.
3237 receiver->interrupt();
3238 }
3239 JVM_END
3240
3241 // Return true iff the current thread has locked the object passed in
3242
3243 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3244 if (obj == nullptr) {
3245 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3246 }
3247 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3248 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3249 JVM_END
3250
3251 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3252 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3253 return JNIHandles::make_local(THREAD, trace);
3254 JVM_END
3255
3256 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3257 VM_PrintThreads op;
3258 VMThread::execute(&op);
3259 if (JvmtiExport::should_post_data_dump()) {
3260 JvmtiExport::post_data_dump();
3261 }
3262 JVM_END
3263
3264 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3265 // We don't use a ThreadsListHandle here because the current thread
3266 // must be alive.
3267 oop java_thread = JNIHandles::resolve_non_null(jthread);
3268 JavaThread* thr = java_lang_Thread::thread(java_thread);
3269 if (thread == thr && !thr->has_attached_via_jni()) {
3270 // Thread naming is only supported for the current thread and
3271 // we don't set the name of an attached thread to avoid stepping
3272 // on other programs.
3273 ResourceMark rm(thread);
3274 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3275 os::set_native_thread_name(thread_name);
3276 }
3277 JVM_END
3278
3279 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3280 oop theCache = thread->scopedValueCache();
3281 return JNIHandles::make_local(THREAD, theCache);
3282 JVM_END
3283
3284 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3285 jobject theCache))
3286 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3287 thread->set_scopedValueCache(objs);
3288 JVM_END
3289
3290 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3291
3292 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3293 ResourceMark rm(THREAD);
3294 JvmtiVMObjectAllocEventCollector oam;
3295 vframeStream vfst(thread);
3296
3297 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3298 // This must only be called from SecurityManager.getClassContext
3299 Method* m = vfst.method();
3300 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3301 m->name() == vmSymbols::getClassContext_name() &&
3302 m->signature() == vmSymbols::void_class_array_signature())) {
3303 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3304 }
3305 }
3306
3307 // Collect method holders
3308 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3309 for (; !vfst.at_end(); vfst.security_next()) {
3310 Method* m = vfst.method();
3311 // Native frames are not returned
3312 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3313 Klass* holder = m->method_holder();
3314 assert(holder->is_klass(), "just checking");
3315 klass_array->append(holder);
3316 }
3317 }
3318
3319 // Create result array of type [Ljava/lang/Class;
3320 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3321 // Fill in mirrors corresponding to method holders
3322 for (int i = 0; i < klass_array->length(); i++) {
3323 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3324 }
3325
3326 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3327 JVM_END
3328
3329
3330 // java.lang.Package ////////////////////////////////////////////////////////////////
3331
3332
3333 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3334 ResourceMark rm(THREAD);
3335 JvmtiVMObjectAllocEventCollector oam;
3336 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3337 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3338 return (jstring) JNIHandles::make_local(THREAD, result);
3339 JVM_END
3340
3341
3342 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3343 JvmtiVMObjectAllocEventCollector oam;
3344 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3345 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3346 JVM_END
3347
3348
3349 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3350
3351
3352 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3353 MonitorLocker ml(Heap_lock);
3354 oop ref = Universe::reference_pending_list();
3355 if (ref != nullptr) {
3356 Universe::clear_reference_pending_list();
3357 }
3358 return JNIHandles::make_local(THREAD, ref);
3359 JVM_END
3360
3361 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3362 MonitorLocker ml(Heap_lock);
3363 return Universe::has_reference_pending_list();
3364 JVM_END
3365
3366 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3367 MonitorLocker ml(Heap_lock);
3368 while (!Universe::has_reference_pending_list()) {
3369 ml.wait();
3370 }
3371 JVM_END
3372
3373 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3374 oop ref_oop = JNIHandles::resolve_non_null(ref);
3375 // PhantomReference has it's own implementation of refersTo().
3376 // See: JVM_PhantomReferenceRefersTo
3377 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3378 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3379 return referent == JNIHandles::resolve(o);
3380 JVM_END
3381
3382 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3383 oop ref_oop = JNIHandles::resolve_non_null(ref);
3384 // FinalReference has it's own implementation of clear().
3385 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3386 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3387 // If the referent has already been cleared then done.
3388 // However, if the referent is dead but has not yet been cleared by
3389 // concurrent reference processing, it should NOT be cleared here.
3390 // Instead, clearing should be left to the GC. Clearing it here could
3391 // detectably lose an expected notification, which is impossible with
3392 // STW reference processing. The clearing in enqueue() doesn't have
3393 // this problem, since the enqueue covers the notification, but it's not
3394 // worth the effort to handle that case specially.
3395 return;
3396 }
3397 java_lang_ref_Reference::clear_referent(ref_oop);
3398 JVM_END
3399
3400
3401 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3402
3403
3404 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3405 oop ref_oop = JNIHandles::resolve_non_null(ref);
3406 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3407 return referent == JNIHandles::resolve(o);
3408 JVM_END
3409
3410
3411 // ObjectInputStream ///////////////////////////////////////////////////////////////
3412
3413 // Return the first user-defined class loader up the execution stack, or null
3414 // if only code from the bootstrap or platform class loader is on the stack.
3415
3416 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3417 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3418 InstanceKlass* ik = vfst.method()->method_holder();
3419 oop loader = ik->class_loader();
3420 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3421 // Skip reflection related frames
3422 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
3423 return JNIHandles::make_local(THREAD, loader);
3424 }
3425 }
3426 }
3427 return nullptr;
3428 JVM_END
3429
3430
3431 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3432
3433
3434 // resolve array handle and check arguments
3435 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3436 if (arr == nullptr) {
3437 THROW_0(vmSymbols::java_lang_NullPointerException());
3438 }
3439 oop a = JNIHandles::resolve_non_null(arr);
3440 if (!a->is_array()) {
3441 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3442 } else if (type_array_only && !a->is_typeArray()) {
3443 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3444 }
3445 return arrayOop(a);
3446 }
3447
3448
3449 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3450 arrayOop a = check_array(env, arr, false, CHECK_0);
3451 return a->length();
3452 JVM_END
3453
3454
3455 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3456 JvmtiVMObjectAllocEventCollector oam;
3457 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3458 jvalue value;
3459 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3460 oop box = Reflection::box(&value, type, CHECK_NULL);
3461 return JNIHandles::make_local(THREAD, box);
3462 JVM_END
3463
3464
3465 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3466 jvalue value;
3467 value.i = 0; // to initialize value before getting used in CHECK
3468 arrayOop a = check_array(env, arr, true, CHECK_(value));
3469 assert(a->is_typeArray(), "just checking");
3470 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3471 BasicType wide_type = (BasicType) wCode;
3472 if (type != wide_type) {
3473 Reflection::widen(&value, type, wide_type, CHECK_(value));
3474 }
3475 return value;
3476 JVM_END
3477
3478
3479 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3480 arrayOop a = check_array(env, arr, false, CHECK);
3481 oop box = JNIHandles::resolve(val);
3482 jvalue value;
3483 value.i = 0; // to initialize value before getting used in CHECK
3484 BasicType value_type;
3485 if (a->is_objArray()) {
3486 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3487 value_type = Reflection::unbox_for_regular_object(box, &value);
3488 } else {
3489 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3490 }
3491 Reflection::array_set(&value, a, index, value_type, CHECK);
3492 JVM_END
3493
3494
3495 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3496 arrayOop a = check_array(env, arr, true, CHECK);
3497 assert(a->is_typeArray(), "just checking");
3498 BasicType value_type = (BasicType) vCode;
3499 Reflection::array_set(&v, a, index, value_type, CHECK);
3500 JVM_END
3501
3502
3503 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3504 JvmtiVMObjectAllocEventCollector oam;
3505 oop element_mirror = JNIHandles::resolve(eltClass);
3506 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3507 return JNIHandles::make_local(THREAD, result);
3508 JVM_END
3509
3510
3511 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3512 JvmtiVMObjectAllocEventCollector oam;
3513 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3514 oop element_mirror = JNIHandles::resolve(eltClass);
3515 assert(dim_array->is_typeArray(), "just checking");
3516 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3517 return JNIHandles::make_local(THREAD, result);
3518 JVM_END
3519
3520
3521 // Library support ///////////////////////////////////////////////////////////////////////////
3522
3523 JVM_LEAF(void*, JVM_LoadZipLibrary())
3524 return ZipLibrary::handle();
3525 JVM_END
3526
3527 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3528 //%note jvm_ct
3529 char ebuf[1024];
3530 void *load_result;
3531 {
3532 ThreadToNativeFromVM ttnfvm(thread);
3533 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3534 }
3535 if (load_result == nullptr) {
3536 if (throwException) {
3537 char msg[1024];
3538 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3539 // Since 'ebuf' may contain a string encoded using
3540 // platform encoding scheme, we need to pass
3541 // Exceptions::unsafe_to_utf8 to the new_exception method
3542 // as the last argument. See bug 6367357.
3543 Handle h_exception =
3544 Exceptions::new_exception(thread,
3545 vmSymbols::java_lang_UnsatisfiedLinkError(),
3546 msg, Exceptions::unsafe_to_utf8);
3547
3548 THROW_HANDLE_0(h_exception);
3549 } else {
3550 log_info(library)("Failed to load library %s", name);
3551 return load_result;
3552 }
3553 }
3554 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3555 return load_result;
3556 JVM_END
3557
3558
3559 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3560 os::dll_unload(handle);
3561 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3562 JVM_END
3563
3564
3565 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3566 void* find_result = os::dll_lookup(handle, name);
3567 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3568 find_result != nullptr ? "Found" : "Failed to find",
3569 name, p2i(handle));
3570 return find_result;
3571 JVM_END
3572
3573
3574 // JNI version ///////////////////////////////////////////////////////////////////////////////
3575
3576 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3577 return Threads::is_supported_jni_version_including_1_1(version);
3578 JVM_END
3579
3580
3581 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3582 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3583 JVM_END
3584
3585 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3586 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3587 JVM_END
3588
3589 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3590 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3591 JVM_END
3592
3593 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3594 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3595 JVM_END
3596
3597 // String support ///////////////////////////////////////////////////////////////////////////
3598
3599 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3600 JvmtiVMObjectAllocEventCollector oam;
3601 if (str == nullptr) return nullptr;
3602 oop string = JNIHandles::resolve_non_null(str);
3603 oop result = StringTable::intern(string, CHECK_NULL);
3604 return (jstring) JNIHandles::make_local(THREAD, result);
3605 JVM_END
3606
3607
3608 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3609
3610 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3611 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3612 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3613 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3614 // nature. JavaThreads will be "in native" when using this API from JDK code.
3615
3616
3617 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3618 VM_Exit::block_if_vm_exited();
3619 return new PlatformMutex();
3620 }
3621
3622
3623 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3624 VM_Exit::block_if_vm_exited();
3625 delete ((PlatformMutex*) mon);
3626 }
3627
3628
3629 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3630 VM_Exit::block_if_vm_exited();
3631 ((PlatformMutex*) mon)->lock();
3632 return 0;
3633 }
3634
3635
3636 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3637 VM_Exit::block_if_vm_exited();
3638 ((PlatformMutex*) mon)->unlock();
3639 }
3640
3641
3642 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3643
3644 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3645 Handle loader, Handle protection_domain,
3646 jboolean throwError, TRAPS) {
3647 // Security Note:
3648 // The Java level wrapper will perform the necessary security check allowing
3649 // us to pass the null as the initiating class loader. The VM is responsible for
3650 // the checkPackageAccess relative to the initiating class loader via the
3651 // protection_domain. The protection_domain is passed as null by the java code
3652 // if there is no security manager in 3-arg Class.forName().
3653 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3654
3655 // Check if we should initialize the class
3656 if (init && klass->is_instance_klass()) {
3657 klass->initialize(CHECK_NULL);
3658 }
3659 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3660 }
3661
3662
3663 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3664
3665 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3666 Handle method_handle;
3667 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3668 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3669 Handle receiver(THREAD, JNIHandles::resolve(obj));
3670 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3671 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3672 jobject res = JNIHandles::make_local(THREAD, result);
3673 if (JvmtiExport::should_post_vm_object_alloc()) {
3674 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3675 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3676 if (java_lang_Class::is_primitive(ret_type)) {
3677 // Only for primitive type vm allocates memory for java object.
3678 // See box() method.
3679 JvmtiExport::post_vm_object_alloc(thread, result);
3680 }
3681 }
3682 return res;
3683 } else {
3684 THROW_0(vmSymbols::java_lang_StackOverflowError());
3685 }
3686 JVM_END
3687
3688
3689 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3690 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3691 oop constructor_mirror = JNIHandles::resolve(c);
3692 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3693 jobject res = JNIHandles::make_local(THREAD, result);
3694 if (JvmtiExport::should_post_vm_object_alloc()) {
3695 JvmtiExport::post_vm_object_alloc(thread, result);
3696 }
3697 return res;
3698 JVM_END
3699
3700 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3701 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3702 assert(k->is_klass(), "just checking");
3703 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3704 JVM_END
3705
3706 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3707 jclass caller,
3708 jstring interfaceMethodName,
3709 jobject factoryType,
3710 jobject interfaceMethodType,
3711 jobject implementationMember,
3712 jobject dynamicMethodType,
3713 jclass lambdaProxyClass))
3714 #if INCLUDE_CDS
3715 if (!CDSConfig::is_dumping_archive()) {
3716 return;
3717 }
3718
3719 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3720 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3721 if (caller_ik->is_hidden()) {
3722 // Hidden classes not of type lambda proxy classes are currently not being archived.
3723 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3724 // registered for archiving.
3725 return;
3726 }
3727 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3728 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3729 assert(lambda_ik->is_hidden(), "must be a hidden class");
3730 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3731
3732 Symbol* interface_method_name = nullptr;
3733 if (interfaceMethodName != nullptr) {
3734 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3735 }
3736 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3737 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3738
3739 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3740 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3741
3742 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3743 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3744 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3745
3746 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3747 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3748
3749 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3750 interface_method_type, m, dynamic_method_type, THREAD);
3751 #endif // INCLUDE_CDS
3752 JVM_END
3753
3754 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3755 jclass caller,
3756 jstring interfaceMethodName,
3757 jobject factoryType,
3758 jobject interfaceMethodType,
3759 jobject implementationMember,
3760 jobject dynamicMethodType))
3761 #if INCLUDE_CDS
3762
3763 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3764 implementationMember == nullptr || dynamicMethodType == nullptr) {
3765 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3766 }
3767
3768 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3769 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3770 if (!caller_ik->is_shared()) {
3771 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3772 return nullptr;
3773 }
3774
3775 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3776 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3777 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3778
3779 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3780 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3781
3782 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3783 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3784 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3785
3786 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3787 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3788
3789 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3790 interface_method_type, m, dynamic_method_type);
3791 jclass jcls = nullptr;
3792 if (lambda_ik != nullptr) {
3793 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3794 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3795 }
3796 return jcls;
3797 #else
3798 return nullptr;
3799 #endif // INCLUDE_CDS
3800 JVM_END
3801
3802 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3803 return CDSConfig::is_dumping_archive();
3804 JVM_END
3805
3806 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3807 return UseSharedSpaces;
3808 JVM_END
3809
3810 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3811 if (CDSConfig::is_dumping_static_archive()) {
3812 // We do this so that the default CDS archive can be deterministic.
3813 const char* release = VM_Version::vm_release();
3814 const char* dbg_level = VM_Version::jdk_debug_level();
3815 const char* version = VM_Version::internal_vm_info_string();
3816 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3817 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3818 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3819 seed += (jlong)VM_Version::vm_major_version();
3820 seed += (jlong)VM_Version::vm_minor_version();
3821 seed += (jlong)VM_Version::vm_security_version();
3822 seed += (jlong)VM_Version::vm_patch_version();
3823 if (seed == 0) { // don't let this ever be zero.
3824 seed = 0x87654321;
3825 }
3826 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3827 return seed;
3828 } else {
3829 return 0;
3830 }
3831 JVM_END
3832
3833 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3834 #if INCLUDE_CDS
3835 return ClassListWriter::is_enabled() || CDSConfig::is_dumping_dynamic_archive();
3836 #else
3837 return false;
3838 #endif // INCLUDE_CDS
3839 JVM_END
3840
3841 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3842 #if INCLUDE_CDS
3843 assert(ClassListWriter::is_enabled() || CDSConfig::is_dumping_dynamic_archive(), "Should be set and open or do dynamic dump");
3844 if (line != nullptr) {
3845 ResourceMark rm(THREAD);
3846 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3847 char* c_line = java_lang_String::as_utf8_string(h_line());
3848 if (CDSConfig::is_dumping_dynamic_archive()) {
3849 // Note: LambdaFormInvokers::append take same format which is not
3850 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3851 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3852 }
3853 if (ClassListWriter::is_enabled()) {
3854 ClassListWriter w;
3855 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3856 }
3857 }
3858 #endif // INCLUDE_CDS
3859 JVM_END
3860
3861 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3862 #if INCLUDE_CDS
3863 ResourceMark rm(THREAD);
3864 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3865 char* file_name = java_lang_String::as_utf8_string(file_handle());
3866 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3867 #endif // INCLUDE_CDS
3868 JVM_END
3869
3870 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3871 #if INCLUDE_CDS
3872 ResourceMark rm(THREAD);
3873 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3874 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3875 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3876 #endif // INCLUDE_CDS
3877 JVM_END
3878
3879 // Returns an array of all live Thread objects (VM internal JavaThreads,
3880 // jvmti agent threads, and JNI attaching threads are skipped)
3881 // See CR 6404306 regarding JNI attaching threads
3882 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3883 ResourceMark rm(THREAD);
3884 ThreadsListEnumerator tle(THREAD, false, false);
3885 JvmtiVMObjectAllocEventCollector oam;
3886
3887 int num_threads = tle.num_threads();
3888 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3889 objArrayHandle threads_ah(THREAD, r);
3890
3891 for (int i = 0; i < num_threads; i++) {
3892 Handle h = tle.get_threadObj(i);
3893 threads_ah->obj_at_put(i, h());
3894 }
3895
3896 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3897 JVM_END
3898
3899
3900 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3901 // Return StackTraceElement[][], each element is the stack trace of a thread in
3902 // the corresponding entry in the given threads array
3903 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3904 JvmtiVMObjectAllocEventCollector oam;
3905
3906 // Check if threads is null
3907 if (threads == nullptr) {
3908 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3909 }
3910
3911 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3912 objArrayHandle ah(THREAD, a);
3913 int num_threads = ah->length();
3914 // check if threads is non-empty array
3915 if (num_threads == 0) {
3916 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3917 }
3918
3919 // check if threads is not an array of objects of Thread class
3920 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3921 if (k != vmClasses::Thread_klass()) {
3922 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3923 }
3924
3925 ResourceMark rm(THREAD);
3926
3927 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3928 for (int i = 0; i < num_threads; i++) {
3929 oop thread_obj = ah->obj_at(i);
3930 instanceHandle h(THREAD, (instanceOop) thread_obj);
3931 thread_handle_array->append(h);
3932 }
3933
3934 // The JavaThread references in thread_handle_array are validated
3935 // in VM_ThreadDump::doit().
3936 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3937 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3938
3939 JVM_END
3940
3941 // JVM monitoring and management support
3942 JVM_LEAF(void*, JVM_GetManagement(jint version))
3943 return Management::get_jmm_interface(version);
3944 JVM_END
3945
3946 // com.sun.tools.attach.VirtualMachine agent properties support
3947 //
3948 // Initialize the agent properties with the properties maintained in the VM
3949 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3950 ResourceMark rm;
3951
3952 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3953
3954 PUTPROP(props, "sun.java.command", Arguments::java_command());
3955 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3956 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3957 return properties;
3958 JVM_END
3959
3960 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3961 {
3962 JvmtiVMObjectAllocEventCollector oam;
3963
3964 if (ofClass == nullptr) {
3965 return nullptr;
3966 }
3967 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3968 // Special handling for primitive objects
3969 if (java_lang_Class::is_primitive(mirror())) {
3970 return nullptr;
3971 }
3972 Klass* k = java_lang_Class::as_Klass(mirror());
3973 if (!k->is_instance_klass()) {
3974 return nullptr;
3975 }
3976 InstanceKlass* ik = InstanceKlass::cast(k);
3977 int encl_method_class_idx = ik->enclosing_method_class_index();
3978 if (encl_method_class_idx == 0) {
3979 return nullptr;
3980 }
3981 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3982 objArrayHandle dest(THREAD, dest_o);
3983 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3984 dest->obj_at_put(0, enc_k->java_mirror());
3985 int encl_method_method_idx = ik->enclosing_method_method_index();
3986 if (encl_method_method_idx != 0) {
3987 Symbol* sym = ik->constants()->symbol_at(
3988 extract_low_short_from_int(
3989 ik->constants()->name_and_type_at(encl_method_method_idx)));
3990 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3991 dest->obj_at_put(1, str());
3992 sym = ik->constants()->symbol_at(
3993 extract_high_short_from_int(
3994 ik->constants()->name_and_type_at(encl_method_method_idx)));
3995 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3996 dest->obj_at_put(2, str());
3997 }
3998 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3999 }
4000 JVM_END
4001
4002 // Returns an array of java.lang.String objects containing the input arguments to the VM.
4003 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
4004 ResourceMark rm(THREAD);
4005
4006 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
4007 return nullptr;
4008 }
4009
4010 char** vm_flags = Arguments::jvm_flags_array();
4011 char** vm_args = Arguments::jvm_args_array();
4012 int num_flags = Arguments::num_jvm_flags();
4013 int num_args = Arguments::num_jvm_args();
4014
4015 InstanceKlass* ik = vmClasses::String_klass();
4016 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
4017 objArrayHandle result_h(THREAD, r);
4018
4019 int index = 0;
4020 for (int j = 0; j < num_flags; j++, index++) {
4021 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
4022 result_h->obj_at_put(index, h());
4023 }
4024 for (int i = 0; i < num_args; i++, index++) {
4025 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
4026 result_h->obj_at_put(index, h());
4027 }
4028 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
4029 JVM_END
4030
4031 JVM_LEAF(jint, JVM_FindSignal(const char *name))
4032 return os::get_signal_number(name);
4033 JVM_END
4034
4035 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
4036 #if INCLUDE_JVMTI
4037 if (!DoJVMTIVirtualThreadTransitions) {
4038 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4039 return;
4040 }
4041 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4042 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
4043 } else {
4044 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4045 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
4046 }
4047 #else
4048 fatal("Should only be called with JVMTI enabled");
4049 #endif
4050 JVM_END
4051
4052 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
4053 #if INCLUDE_JVMTI
4054 if (!DoJVMTIVirtualThreadTransitions) {
4055 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4056 return;
4057 }
4058 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4059 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
4060 } else {
4061 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4062 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
4063 }
4064 #else
4065 fatal("Should only be called with JVMTI enabled");
4066 #endif
4067 JVM_END
4068
4069 // If notifications are disabled then just update the VTMS transition bit and return.
4070 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
4071 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
4072 #if INCLUDE_JVMTI
4073 if (!DoJVMTIVirtualThreadTransitions) {
4074 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4075 return;
4076 }
4077 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4078 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
4079 } else {
4080 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4081 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4082 }
4083 #else
4084 fatal("Should only be called with JVMTI enabled");
4085 #endif
4086 JVM_END
4087
4088 // If notifications are disabled then just update the VTMS transition bit and return.
4089 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
4090 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
4091 #if INCLUDE_JVMTI
4092 if (!DoJVMTIVirtualThreadTransitions) {
4093 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4094 return;
4095 }
4096 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4097 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
4098 } else {
4099 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4100 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4101 }
4102 #else
4103 fatal("Should only be called with JVMTI enabled");
4104 #endif
4105 JVM_END
4106
4107 // Always update the temporary VTMS transition bit.
4108 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
4109 #if INCLUDE_JVMTI
4110 if (!DoJVMTIVirtualThreadTransitions) {
4111 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4112 return;
4113 }
4114 assert(!thread->is_in_VTMS_transition(), "sanity check");
4115 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
4116 thread->toggle_is_in_tmp_VTMS_transition();
4117 #else
4118 fatal("Should only be called with JVMTI enabled");
4119 #endif
4120 JVM_END
4121
4122 /*
4123 * Return the current class's class file version. The low order 16 bits of the
4124 * returned jint contain the class's major version. The high order 16 bits
4125 * contain the class's minor version.
4126 */
4127 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4128 oop mirror = JNIHandles::resolve_non_null(current);
4129 if (java_lang_Class::is_primitive(mirror)) {
4130 // return latest major version and minor version of 0.
4131 return JVM_CLASSFILE_MAJOR_VERSION;
4132 }
4133 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4134
4135 Klass* c = java_lang_Class::as_Klass(mirror);
4136 assert(c->is_instance_klass(), "must be");
4137 InstanceKlass* ik = InstanceKlass::cast(c);
4138 return (ik->minor_version() << 16) | ik->major_version();
4139 JVM_END
4140
4141 /*
4142 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4143 * get the value will see a materialized value and not a scalar-replaced
4144 * null value.
4145 */
4146 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4147 JVM_EnsureMaterializedForStackWalk(env, value);
4148 JVM_END
4149
4150 /*
4151 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4152 */
4153 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4154 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4155 JVM_END