1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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 #ifdef LINUX
118 #include "osContainer_linux.hpp"
119 #endif
120
121 #include <errno.h>
122
123 /*
124 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
125 such ctors and calls MUST NOT come between an oop declaration/init and its
126 usage because if objects are move this may cause various memory stomps, bus
127 errors and segfaults. Here is a cookbook for causing so called "naked oop
128 failures":
129
130 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
131 // Object address to be held directly in mirror & not visible to GC
132 oop mirror = JNIHandles::resolve_non_null(ofClass);
133
134 // If this ctor can hit a safepoint, moving objects around, then
135 ComplexConstructor foo;
136
137 // Boom! mirror may point to JUNK instead of the intended object
138 (some dereference of mirror)
139
140 // Here's another call that may block for GC, making mirror stale
141 MutexLocker ml(some_lock);
142
143 // And here's an initializer that can result in a stale oop
144 // all in one step.
145 oop o = call_that_can_throw_exception(TRAPS);
146
147
148 The solution is to keep the oop declaration BELOW the ctor or function
149 call that might cause a GC, do another resolve to reassign the oop, or
150 consider use of a Handle instead of an oop so there is immunity from object
151 motion. But note that the "QUICK" entries below do not have a handlemark
152 and thus can only support use of handles passed in.
153 */
154
155 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
156 ResourceMark rm;
157 int line_number = -1;
158 const char * source_file = nullptr;
159 const char * trace = "explicit";
160 InstanceKlass* caller = nullptr;
161 JavaThread* jthread = THREAD;
162 if (jthread->has_last_Java_frame()) {
163 vframeStream vfst(jthread);
164
165 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
166 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
167 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
168 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
169 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
170
171 Method* last_caller = nullptr;
172
173 while (!vfst.at_end()) {
174 Method* m = vfst.method();
175 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
176 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
177 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
178 break;
179 }
180 last_caller = m;
181 vfst.next();
182 }
183 // if this is called from Class.forName0 and that is called from Class.forName,
184 // then print the caller of Class.forName. If this is Class.loadClass, then print
185 // that caller, otherwise keep quiet since this should be picked up elsewhere.
186 bool found_it = false;
187 if (!vfst.at_end() &&
188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
189 vfst.method()->name() == vmSymbols::forName0_name()) {
190 vfst.next();
191 if (!vfst.at_end() &&
192 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
193 vfst.method()->name() == vmSymbols::forName_name()) {
194 vfst.next();
195 found_it = true;
196 }
197 } else if (last_caller != nullptr &&
198 last_caller->method_holder()->name() ==
199 vmSymbols::java_lang_ClassLoader() &&
200 last_caller->name() == vmSymbols::loadClass_name()) {
201 found_it = true;
202 } else if (!vfst.at_end()) {
203 if (vfst.method()->is_native()) {
204 // JNI call
205 found_it = true;
206 }
207 }
208 if (found_it && !vfst.at_end()) {
209 // found the caller
210 caller = vfst.method()->method_holder();
211 line_number = vfst.method()->line_number_from_bci(vfst.bci());
212 if (line_number == -1) {
213 // show method name if it's a native method
214 trace = vfst.method()->name_and_sig_as_C_string();
215 }
216 Symbol* s = caller->source_file_name();
217 if (s != nullptr) {
218 source_file = s->as_C_string();
219 }
220 }
221 }
222 if (caller != nullptr) {
223 if (to_class != caller) {
224 const char * from = caller->external_name();
225 const char * to = to_class->external_name();
226 // print in a single call to reduce interleaving between threads
227 if (source_file != nullptr) {
228 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
229 } else {
230 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
231 }
232 }
233 }
234 }
235
236 void trace_class_resolution(Klass* to_class) {
237 EXCEPTION_MARK;
238 trace_class_resolution_impl(to_class, THREAD);
239 if (HAS_PENDING_EXCEPTION) {
240 CLEAR_PENDING_EXCEPTION;
241 }
242 }
243
244 // java.lang.System //////////////////////////////////////////////////////////////////////
245
246
247 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
248 return os::javaTimeMillis();
249 JVM_END
250
251 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
252 return os::javaTimeNanos();
253 JVM_END
254
255 // The function below is actually exposed by jdk.internal.misc.VM and not
256 // java.lang.System, but we choose to keep it here so that it stays next
257 // to JVM_CurrentTimeMillis and JVM_NanoTime
258
259 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
260 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
261
262 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
263 jlong seconds;
264 jlong nanos;
265
266 os::javaTimeSystemUTC(seconds, nanos);
267
268 // We're going to verify that the result can fit in a long.
269 // For that we need the difference in seconds between 'seconds'
270 // and 'offset_secs' to be such that:
271 // |seconds - offset_secs| < (2^63/10^9)
272 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
273 // which makes |seconds - offset_secs| < 2^33
274 // and we will prefer +/- 2^32 as the maximum acceptable diff
275 // as 2^32 has a more natural feel than 2^33...
276 //
277 // So if |seconds - offset_secs| >= 2^32 - we return a special
278 // sentinel value (-1) which the caller should take as an
279 // exception value indicating that the offset given to us is
280 // too far from range of the current time - leading to too big
281 // a nano adjustment. The caller is expected to recover by
282 // computing a more accurate offset and calling this method
283 // again. (For the record 2^32 secs is ~136 years, so that
284 // should rarely happen)
285 //
286 jlong diff = seconds - offset_secs;
287 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
288 return -1; // sentinel value: the offset is too far off the target
289 }
290
291 // return the adjustment. If you compute a time by adding
292 // this number of nanoseconds along with the number of seconds
293 // in the offset you should get the current UTC time.
294 return (diff * (jlong)1000000000) + nanos;
295 JVM_END
296
297 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
298 jobject dst, jint dst_pos, jint length))
299 // Check if we have null pointers
300 if (src == nullptr || dst == nullptr) {
301 THROW(vmSymbols::java_lang_NullPointerException());
302 }
303 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
304 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
305 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
306 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
307 // Do copy
308 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
309 JVM_END
310
311
312 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
313 JavaValue r(T_OBJECT);
314 // public synchronized Object put(Object key, Object value);
315 HandleMark hm(THREAD);
316 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
317 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
318 JavaCalls::call_virtual(&r,
319 props,
320 vmClasses::Properties_klass(),
321 vmSymbols::put_name(),
322 vmSymbols::object_object_object_signature(),
323 key_str,
324 value_str,
325 THREAD);
326 }
327
328
329 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
330
331 /*
332 * Return all of the system properties in a Java String array with alternating
333 * names and values from the jvm SystemProperty.
334 * Which includes some internal and all commandline -D defined properties.
335 */
336 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
337 ResourceMark rm(THREAD);
338 HandleMark hm(THREAD);
339 int ndx = 0;
340 int fixedCount = 2;
341
342 SystemProperty* p = Arguments::system_properties();
343 int count = Arguments::PropertyList_count(p);
344
345 // Allocate result String array
346 InstanceKlass* ik = vmClasses::String_klass();
347 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
348 objArrayHandle result_h(THREAD, r);
349
350 while (p != nullptr) {
351 const char * key = p->key();
352 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
353 const char * value = p->value();
354 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
355 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
356 result_h->obj_at_put(ndx * 2, key_str());
357 result_h->obj_at_put(ndx * 2 + 1, value_str());
358 ndx++;
359 }
360 p = p->next();
361 }
362
363 // Convert the -XX:MaxDirectMemorySize= command line flag
364 // to the sun.nio.MaxDirectMemorySize property.
365 // Do this after setting user properties to prevent people
366 // from setting the value with a -D option, as requested.
367 // Leave empty if not supplied
368 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
369 char as_chars[256];
370 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
371 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
372 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
373 result_h->obj_at_put(ndx * 2, key_str());
374 result_h->obj_at_put(ndx * 2 + 1, value_str());
375 ndx++;
376 }
377
378 // JVM monitoring and management support
379 // Add the sun.management.compiler property for the compiler's name
380 {
381 #undef CSIZE
382 #if defined(_LP64) || defined(_WIN64)
383 #define CSIZE "64-Bit "
384 #else
385 #define CSIZE
386 #endif // 64bit
387
388 #if COMPILER1_AND_COMPILER2
389 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
390 #else
391 #if defined(COMPILER1)
392 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
393 #elif defined(COMPILER2)
394 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
395 #elif INCLUDE_JVMCI
396 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
397 #else
398 const char* compiler_name = "";
399 #endif // compilers
400 #endif // COMPILER1_AND_COMPILER2
401
402 if (*compiler_name != '\0' &&
403 (Arguments::mode() != Arguments::_int)) {
404 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
405 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
406 result_h->obj_at_put(ndx * 2, key_str());
407 result_h->obj_at_put(ndx * 2 + 1, value_str());
408 ndx++;
409 }
410 }
411
412 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
413 JVM_END
414
415
416 /*
417 * Return the temporary directory that the VM uses for the attach
418 * and perf data files.
419 *
420 * It is important that this directory is well-known and the
421 * same for all VM instances. It cannot be affected by configuration
422 * variables such as java.io.tmpdir.
423 */
424 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
425 HandleMark hm(THREAD);
426 const char* temp_dir = os::get_temp_directory();
427 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
428 return (jstring) JNIHandles::make_local(THREAD, h());
429 JVM_END
430
431 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
432 if (len < 0) {
433 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
434 }
435 elmClass->initialize(CHECK);
436 if (elmClass->is_identity_class()) {
437 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
438 }
439 if (elmClass->is_abstract()) {
440 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
441 }
442 }
443
444 JVM_ENTRY(jarray, JVM_NewNullRestrictedArray(JNIEnv *env, jclass elmClass, jint len))
445 oop mirror = JNIHandles::resolve_non_null(elmClass);
446 Klass* klass = java_lang_Class::as_Klass(mirror);
447 klass->initialize(CHECK_NULL);
448 validate_array_arguments(klass, len, CHECK_NULL);
449 InlineKlass* vk = InlineKlass::cast(klass);
450 if (!vk->is_implicitly_constructible()) {
451 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible");
452 }
453 oop array = nullptr;
454 if (vk->flat_array()) {
455 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL);
456 } else {
457 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
458 }
459 return (jarray) JNIHandles::make_local(THREAD, array);
460 JVM_END
461
462 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len))
463 oop mirror = JNIHandles::resolve_non_null(elmClass);
464 Klass* klass = java_lang_Class::as_Klass(mirror);
465 klass->initialize(CHECK_NULL);
466 validate_array_arguments(klass, len, CHECK_NULL);
467 InlineKlass* vk = InlineKlass::cast(klass);
468 if (!vk->is_implicitly_constructible()) {
469 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible");
470 }
471 oop array = nullptr;
472 if (UseFlatArray && vk->has_atomic_layout()) {
473 array = oopFactory::new_flatArray(vk, len, LayoutKind::ATOMIC_FLAT, CHECK_NULL);
474 } else if (UseFlatArray && vk->is_naturally_atomic()) {
475 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL);
476 } else {
477 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
478 }
479 return (jarray) JNIHandles::make_local(THREAD, array);
480 JVM_END
481
482 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
483 oop mirror = JNIHandles::resolve_non_null(elmClass);
484 Klass* klass = java_lang_Class::as_Klass(mirror);
485 klass->initialize(CHECK_NULL);
486 validate_array_arguments(klass, len, CHECK_NULL);
487 InlineKlass* vk = InlineKlass::cast(klass);
488 if (!vk->is_implicitly_constructible()) {
489 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible");
490 }
491 oop array = nullptr;
492 if (UseFlatArray && vk->has_nullable_atomic_layout()) {
493 array = oopFactory::new_flatArray(vk, len, LayoutKind::NULLABLE_ATOMIC_FLAT, CHECK_NULL);
494 } else {
495 array = oopFactory::new_objArray(vk, len, CHECK_NULL);
496 }
497 return (jarray) JNIHandles::make_local(THREAD, array);
498 JVM_END
499
500 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
501 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
502 return oop->is_flatArray();
503 JVM_END
504
505 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
506 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
507 return oop->is_null_free_array();
508 JVM_END
509
510 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
511
512 extern volatile jint vm_created;
513
514 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
515 EventShutdown event;
516 if (event.should_commit()) {
517 event.set_reason("Shutdown requested from Java");
518 event.commit();
519 }
520 JVM_END
521
522
523 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
524 before_exit(thread, true);
525 vm_exit(code);
526 JVM_END
527
528
529 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
530 if (!DisableExplicitGC) {
531 EventSystemGC event;
532 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
533 Universe::heap()->collect(GCCause::_java_lang_system_gc);
534 event.commit();
535 }
536 JVM_END
537
538
539 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
540 return Universe::heap()->millis_since_last_whole_heap_examined();
541 JVM_END
542
543
544 static inline jlong convert_size_t_to_jlong(size_t val) {
545 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
546 NOT_LP64 (return (jlong)val;)
547 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
548 }
549
550 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
551 size_t n = Universe::heap()->capacity();
552 return convert_size_t_to_jlong(n);
553 JVM_END
554
555
556 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
557 size_t n = Universe::heap()->unused();
558 return convert_size_t_to_jlong(n);
559 JVM_END
560
561
562 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
563 size_t n = Universe::heap()->max_capacity();
564 return convert_size_t_to_jlong(n);
565 JVM_END
566
567
568 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
569 return os::active_processor_count();
570 JVM_END
571
572 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
573 #ifdef LINUX
574 if (UseContainerSupport) {
575 return JNI_TRUE;
576 }
577 #endif
578 return JNI_FALSE;
579 JVM_END
580
581 JVM_LEAF(jboolean, JVM_IsContainerized(void))
582 #ifdef LINUX
583 if (OSContainer::is_containerized()) {
584 return JNI_TRUE;
585 }
586 #endif
587 return JNI_FALSE;
588 JVM_END
589
590 // java.lang.Throwable //////////////////////////////////////////////////////
591
592 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
593 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
594 java_lang_Throwable::fill_in_stack_trace(exception);
595 JVM_END
596
597 // java.lang.NullPointerException ///////////////////////////////////////////
598
599 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
600 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
601
602 oop exc = JNIHandles::resolve_non_null(throwable);
603
604 Method* method;
605 int bci;
606 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
607 return nullptr;
608 }
609 if (method->is_native()) {
610 return nullptr;
611 }
612
613 stringStream ss;
614 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
615 if (ok) {
616 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
617 return (jstring) JNIHandles::make_local(THREAD, result);
618 } else {
619 return nullptr;
620 }
621 JVM_END
622
623 // java.lang.StackTraceElement //////////////////////////////////////////////
624
625
626 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
627 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
628 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
629 objArrayHandle stack_trace(THREAD, st);
630 // Fill in the allocated stack trace
631 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
632 JVM_END
633
634
635 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
636 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
637 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
638 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
639 JVM_END
640
641
642 // java.lang.StackWalker //////////////////////////////////////////////////////
643 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
644 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
645
646 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
647 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
648 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
649 if (!have_name) {
650 oop name = StringTable::intern(method->name(), CHECK);
651 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
652 }
653 if (!have_type) {
654 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
655 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
656 }
657 JVM_END
658
659 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
660 jint skip_frames, jobject contScope, jobject cont,
661 jint buffer_size, jint start_index, jobjectArray frames))
662 if (!thread->has_last_Java_frame()) {
663 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
664 }
665
666 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
667 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
668 Handle cont_h(THREAD, JNIHandles::resolve(cont));
669 // frames array is a ClassFrameInfo[] array when only getting caller reference,
670 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
671 // be null.
672 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
673 objArrayHandle frames_array_h(THREAD, fa);
674
675 if (frames_array_h->length() < buffer_size) {
676 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
677 }
678
679 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
680 buffer_size, start_index, frames_array_h, CHECK_NULL);
681 return JNIHandles::make_local(THREAD, result);
682 JVM_END
683
684
685 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
686 jint last_batch_count, jint buffer_size, jint start_index,
687 jobjectArray frames))
688 // frames array is a ClassFrameInfo[] array when only getting caller reference,
689 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
690 // be null.
691 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
692 objArrayHandle frames_array_h(THREAD, fa);
693
694 if (frames_array_h->length() < buffer_size) {
695 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
696 }
697
698 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
699 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
700 start_index, frames_array_h, THREAD);
701 JVM_END
702
703 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
704 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
705 objArrayHandle frames_array_h(THREAD, fa);
706 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
707 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
708
709 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
710 JVM_END
711
712 // java.lang.Object ///////////////////////////////////////////////
713
714
715 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
716 // as implemented in the classic virtual machine; return 0 if object is null
717 if (handle == nullptr) {
718 return 0;
719 }
720 oop obj = JNIHandles::resolve_non_null(handle);
721 if (EnableValhalla && obj->klass()->is_inline_klass()) {
722 JavaValue result(T_INT);
723 JavaCallArguments args;
724 Handle ho(THREAD, obj);
725 args.push_oop(ho);
726 methodHandle method(THREAD, Universe::value_object_hash_code_method());
727 JavaCalls::call(&result, method, &args, THREAD);
728 if (HAS_PENDING_EXCEPTION) {
729 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
730 Handle e(THREAD, PENDING_EXCEPTION);
731 CLEAR_PENDING_EXCEPTION;
732 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
733 }
734 }
735 return result.get_jint();
736 } else {
737 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
738 }
739 JVM_END
740
741
742 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
743 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
744 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
745 if (JvmtiExport::should_post_monitor_wait()) {
746 JvmtiExport::post_monitor_wait(thread, obj(), ms);
747
748 // The current thread already owns the monitor and it has not yet
749 // been added to the wait queue so the current thread cannot be
750 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
751 // event handler cannot accidentally consume an unpark() meant for
752 // the ParkEvent associated with this ObjectMonitor.
753 }
754 ObjectSynchronizer::wait(obj, ms, CHECK);
755 JVM_END
756
757
758 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
759 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
760 ObjectSynchronizer::notify(obj, CHECK);
761 JVM_END
762
763
764 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
765 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
766 ObjectSynchronizer::notifyall(obj, CHECK);
767 JVM_END
768
769
770 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
771 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
772 Klass* klass = obj->klass();
773 JvmtiVMObjectAllocEventCollector oam;
774
775 #ifdef ASSERT
776 // Just checking that the cloneable flag is set correct
777 if (obj->is_array()) {
778 guarantee(klass->is_cloneable(), "all arrays are cloneable");
779 } else {
780 guarantee(obj->is_instance(), "should be instanceOop");
781 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
782 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
783 }
784 #endif
785
786 // Check if class of obj supports the Cloneable interface.
787 // All arrays are considered to be cloneable (See JLS 20.1.5).
788 // All j.l.r.Reference classes are considered non-cloneable.
789 if (!klass->is_cloneable() ||
790 (klass->is_instance_klass() &&
791 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
792 ResourceMark rm(THREAD);
793 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
794 }
795
796 if (klass->is_inline_klass()) {
797 // Value instances have no identity, so return the current instance instead of allocating a new one
798 // Value classes cannot have finalizers, so the method can return immediately
799 return JNIHandles::make_local(THREAD, obj());
800 }
801
802 // Make shallow object copy
803 const size_t size = obj->size();
804 oop new_obj_oop = nullptr;
805 if (obj->is_array()) {
806 const int length = ((arrayOop)obj())->length();
807 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
808 /* do_zero */ true, CHECK_NULL);
809 } else {
810 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
811 }
812
813 HeapAccess<>::clone(obj(), new_obj_oop, size);
814
815 Handle new_obj(THREAD, new_obj_oop);
816 // Caution: this involves a java upcall, so the clone should be
817 // "gc-robust" by this stage.
818 if (klass->has_finalizer()) {
819 assert(obj->is_instance(), "should be instanceOop");
820 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
821 new_obj = Handle(THREAD, new_obj_oop);
822 }
823
824 return JNIHandles::make_local(THREAD, new_obj());
825 JVM_END
826
827 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
828
829 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
830 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
831 JVM_END
832
833 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
834 return InstanceKlass::is_finalization_enabled();
835 JVM_END
836
837 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
838
839 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
840 CONT_RegisterNativeMethods(env, cls);
841 JVM_END
842
843 // java.io.File ///////////////////////////////////////////////////////////////
844
845 JVM_LEAF(char*, JVM_NativePath(char* path))
846 return os::native_path(path);
847 JVM_END
848
849
850 // Misc. class handling ///////////////////////////////////////////////////////////
851
852
853 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
854 // Getting the class of the caller frame.
855 //
856 // The call stack at this point looks something like this:
857 //
858 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
859 // [1] [ @CallerSensitive API.method ]
860 // [.] [ (skipped intermediate frames) ]
861 // [n] [ caller ]
862 vframeStream vfst(thread);
863 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
864 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
865 Method* m = vfst.method();
866 assert(m != nullptr, "sanity");
867 switch (n) {
868 case 0:
869 // This must only be called from Reflection.getCallerClass
870 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
871 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
872 }
873 // fall-through
874 case 1:
875 // Frame 0 and 1 must be caller sensitive.
876 if (!m->caller_sensitive()) {
877 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
878 }
879 break;
880 default:
881 if (!m->is_ignored_by_security_stack_walk()) {
882 // We have reached the desired frame; return the holder class.
883 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
884 }
885 break;
886 }
887 }
888 return nullptr;
889 JVM_END
890
891
892 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
893 oop mirror = nullptr;
894 BasicType t = name2type(utf);
895 if (t != T_ILLEGAL && !is_reference_type(t)) {
896 mirror = Universe::java_mirror(t);
897 }
898 if (mirror == nullptr) {
899 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
900 } else {
901 return (jclass) JNIHandles::make_local(THREAD, mirror);
902 }
903 JVM_END
904
905
906 // Returns a class loaded by the bootstrap class loader; or null
907 // if not found. ClassNotFoundException is not thrown.
908 // FindClassFromBootLoader is exported to the launcher for windows.
909 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
910 const char* name))
911 // Java libraries should ensure that name is never null or illegal.
912 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
913 // It's impossible to create this class; the name cannot fit
914 // into the constant pool.
915 return nullptr;
916 }
917 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
918
919 TempNewSymbol h_name = SymbolTable::new_symbol(name);
920 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
921 if (k == nullptr) {
922 return nullptr;
923 }
924
925 if (log_is_enabled(Debug, class, resolve)) {
926 trace_class_resolution(k);
927 }
928 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
929 JVM_END
930
931 // Find a class with this name in this loader, using the caller's protection domain.
932 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
933 jboolean init, jobject loader,
934 jclass caller))
935 TempNewSymbol h_name =
936 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
937 CHECK_NULL);
938
939 oop loader_oop = JNIHandles::resolve(loader);
940 oop from_class = JNIHandles::resolve(caller);
941 oop protection_domain = nullptr;
942 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
943 // NPE. Put it in another way, the bootstrap class loader has all permission and
944 // thus no checkPackageAccess equivalence in the VM class loader.
945 // The caller is also passed as null by the java code if there is no security
946 // manager to avoid the performance cost of getting the calling class.
947 if (from_class != nullptr && loader_oop != nullptr) {
948 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
949 }
950
951 Handle h_loader(THREAD, loader_oop);
952 Handle h_prot(THREAD, protection_domain);
953 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
954 h_prot, false, THREAD);
955
956 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
957 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
958 }
959 return result;
960 JVM_END
961
962 // Currently only called from the old verifier.
963 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
964 jboolean init, jclass from))
965 TempNewSymbol h_name =
966 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
967 CHECK_NULL);
968 oop from_class_oop = JNIHandles::resolve(from);
969 Klass* from_class = (from_class_oop == nullptr)
970 ? (Klass*)nullptr
971 : java_lang_Class::as_Klass(from_class_oop);
972 oop class_loader = nullptr;
973 oop protection_domain = nullptr;
974 if (from_class != nullptr) {
975 class_loader = from_class->class_loader();
976 protection_domain = from_class->protection_domain();
977 }
978 Handle h_loader(THREAD, class_loader);
979 Handle h_prot (THREAD, protection_domain);
980 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
981 h_prot, true, thread);
982
983 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
984 // this function is generally only used for class loading during verification.
985 ResourceMark rm;
986 oop from_mirror = JNIHandles::resolve_non_null(from);
987 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
988 const char * from_name = from_class->external_name();
989
990 oop mirror = JNIHandles::resolve_non_null(result);
991 Klass* to_class = java_lang_Class::as_Klass(mirror);
992 const char * to = to_class->external_name();
993 log_debug(class, resolve)("%s %s (verification)", from_name, to);
994 }
995
996 return result;
997 JVM_END
998
999 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1000 static jclass jvm_define_class_common(const char *name,
1001 jobject loader, const jbyte *buf,
1002 jsize len, jobject pd, const char *source,
1003 TRAPS) {
1004 if (source == nullptr) source = "__JVM_DefineClass__";
1005
1006 JavaThread* jt = THREAD;
1007
1008 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1009 ClassLoader::perf_define_appclass_selftime(),
1010 ClassLoader::perf_define_appclasses(),
1011 jt->get_thread_stat()->perf_recursion_counts_addr(),
1012 jt->get_thread_stat()->perf_timers_addr(),
1013 PerfClassTraceTime::DEFINE_CLASS);
1014
1015 if (UsePerfData) {
1016 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1017 }
1018
1019 // Class resolution will get the class name from the .class stream if the name is null.
1020 TempNewSymbol class_name = name == nullptr ? nullptr :
1021 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1022 CHECK_NULL);
1023
1024 ResourceMark rm(THREAD);
1025 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1026 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1027 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1028 ClassLoadInfo cl_info(protection_domain);
1029 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1030 class_loader,
1031 cl_info,
1032 CHECK_NULL);
1033
1034 if (log_is_enabled(Debug, class, resolve)) {
1035 trace_class_resolution(k);
1036 }
1037
1038 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1039 }
1040
1041 enum {
1042 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1043 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1044 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1045 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1046 };
1047
1048 /*
1049 * Define a class with the specified flags that indicates if it's a nestmate,
1050 * hidden, or strongly referenced from class loader.
1051 */
1052 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1053 const jbyte *buf, jsize len, jobject pd,
1054 jboolean init, int flags, jobject classData, TRAPS) {
1055 ResourceMark rm(THREAD);
1056
1057 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
1058 // Lookup class must be a non-null instance
1059 if (lookup_k == nullptr) {
1060 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1061 }
1062 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
1063
1064 Handle class_loader (THREAD, lookup_k->class_loader());
1065
1066 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1067 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1068 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1069 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1070
1071 InstanceKlass* host_class = nullptr;
1072 if (is_nestmate) {
1073 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1074 }
1075
1076 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1077 name,
1078 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1079 is_nestmate ? host_class->external_name() : "",
1080 is_hidden ? "hidden" : "not hidden",
1081 is_strong ? "strong" : "weak",
1082 vm_annotations ? "with vm annotations" : "without vm annotation");
1083
1084 if (!is_hidden) {
1085 // classData is only applicable for hidden classes
1086 if (classData != nullptr) {
1087 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1088 }
1089 if (is_nestmate) {
1090 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1091 }
1092 if (!is_strong) {
1093 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1094 }
1095 if (vm_annotations) {
1096 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1097 }
1098 if (flags != STRONG_LOADER_LINK) {
1099 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1100 err_msg("invalid flag 0x%x", flags));
1101 }
1102 }
1103
1104 // Class resolution will get the class name from the .class stream if the name is null.
1105 TempNewSymbol class_name = name == nullptr ? nullptr :
1106 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1107 CHECK_NULL);
1108
1109 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1110 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1111 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1112
1113 InstanceKlass* ik = nullptr;
1114 if (!is_hidden) {
1115 ClassLoadInfo cl_info(protection_domain);
1116 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1117 class_loader,
1118 cl_info,
1119 CHECK_NULL);
1120
1121 if (log_is_enabled(Debug, class, resolve)) {
1122 trace_class_resolution(ik);
1123 }
1124 } else { // hidden
1125 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1126 ClassLoadInfo cl_info(protection_domain,
1127 host_class,
1128 classData_h,
1129 is_hidden,
1130 is_strong,
1131 vm_annotations);
1132 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1133 class_loader,
1134 cl_info,
1135 CHECK_NULL);
1136
1137 // The hidden class loader data has been artificially been kept alive to
1138 // this point. The mirror and any instances of this class have to keep
1139 // it alive afterwards.
1140 ik->class_loader_data()->dec_keep_alive_ref_count();
1141
1142 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1143 ModuleEntry* module = ik->module();
1144 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1145 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1146 module_name,
1147 ik->external_name(),
1148 host_class->external_name(),
1149 ik->is_hidden() ? "is hidden" : "is not hidden");
1150 }
1151 }
1152
1153 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1154 // non-hidden class or nestmate class must be in the same package as the Lookup class
1155 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1156 }
1157
1158 if (init) {
1159 ik->initialize(CHECK_NULL);
1160 } else {
1161 ik->link_class(CHECK_NULL);
1162 }
1163
1164 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1165 }
1166
1167 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1168 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1169 JVM_END
1170
1171 /*
1172 * Define a class with the specified lookup class.
1173 * lookup: Lookup class
1174 * name: the name of the class
1175 * buf: class bytes
1176 * len: length of class bytes
1177 * pd: protection domain
1178 * init: initialize the class
1179 * flags: properties of the class
1180 * classData: private static pre-initialized field
1181 */
1182 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1183 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1184
1185 if (lookup == nullptr) {
1186 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1187 }
1188
1189 assert(buf != nullptr, "buf must not be null");
1190
1191 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1192 JVM_END
1193
1194 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1195
1196 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1197 JVM_END
1198
1199 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1200 ResourceMark rm(THREAD);
1201
1202 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1203 char* str = java_lang_String::as_utf8_string(h_name());
1204
1205 // Sanity check, don't expect null
1206 if (str == nullptr) return nullptr;
1207
1208 // Internalize the string, converting '.' to '/' in string.
1209 char* p = (char*)str;
1210 while (*p != '\0') {
1211 if (*p == '.') {
1212 *p = '/';
1213 }
1214 p++;
1215 }
1216
1217 const int str_len = (int)(p - str);
1218 if (str_len > Symbol::max_length()) {
1219 // It's impossible to create this class; the name cannot fit
1220 // into the constant pool.
1221 return nullptr;
1222 }
1223 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1224
1225 // Security Note:
1226 // The Java level wrapper will perform the necessary security check allowing
1227 // us to pass the null as the initiating class loader.
1228 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1229 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1230 h_loader,
1231 Handle());
1232 #if INCLUDE_CDS
1233 if (k == nullptr) {
1234 // If the class is not already loaded, try to see if it's in the shared
1235 // archive for the current classloader (h_loader).
1236 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1237 }
1238 #endif
1239 return (k == nullptr) ? nullptr :
1240 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1241 JVM_END
1242
1243 // Module support //////////////////////////////////////////////////////////////////////////////
1244
1245 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1246 jstring location, jobjectArray packages))
1247 Handle h_module (THREAD, JNIHandles::resolve(module));
1248 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1249 JVM_END
1250
1251 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1252 Handle h_module (THREAD, JNIHandles::resolve(module));
1253 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1254 JVM_END
1255
1256 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1257 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1258 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1259 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1260 JVM_END
1261
1262 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1263 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1264 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1265 JVM_END
1266
1267 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1268 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1269 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1270 JVM_END
1271
1272 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1273 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1274 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1275 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1276 JVM_END
1277
1278 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1279 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1280 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1281 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1282 JVM_END
1283
1284 // Reflection support //////////////////////////////////////////////////////////////////////////////
1285
1286 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1287 assert (cls != nullptr, "illegal class");
1288 JvmtiVMObjectAllocEventCollector oam;
1289 ResourceMark rm(THREAD);
1290 HandleMark hm(THREAD);
1291 Handle java_class(THREAD, JNIHandles::resolve(cls));
1292 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1293 return (jstring) JNIHandles::make_local(THREAD, result);
1294 JVM_END
1295
1296
1297 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1298 JvmtiVMObjectAllocEventCollector oam;
1299 oop mirror = JNIHandles::resolve_non_null(cls);
1300
1301 // Special handling for primitive objects
1302 if (java_lang_Class::is_primitive(mirror)) {
1303 // Primitive objects does not have any interfaces
1304 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1305 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1306 }
1307
1308 Klass* klass = java_lang_Class::as_Klass(mirror);
1309 // Figure size of result array
1310 int size;
1311 if (klass->is_instance_klass()) {
1312 InstanceKlass* ik = InstanceKlass::cast(klass);
1313 size = ik->local_interfaces()->length();
1314 } else {
1315 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1316 size = 2;
1317 }
1318
1319 // Allocate result array
1320 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1321 objArrayHandle result (THREAD, r);
1322 // Fill in result
1323 if (klass->is_instance_klass()) {
1324 // Regular instance klass, fill in all local interfaces
1325 for (int index = 0; index < size; index++) {
1326 InstanceKlass* ik = InstanceKlass::cast(klass);
1327 Klass* k = ik->local_interfaces()->at(index);
1328 result->obj_at_put(index, k->java_mirror());
1329 }
1330 } else {
1331 // All arrays implement java.lang.Cloneable and java.io.Serializable
1332 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1333 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1334 }
1335 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1336 JVM_END
1337
1338
1339 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1340 oop mirror = JNIHandles::resolve_non_null(cls);
1341 if (java_lang_Class::is_primitive(mirror)) {
1342 return JNI_FALSE;
1343 }
1344 Klass* k = java_lang_Class::as_Klass(mirror);
1345 jboolean result = k->is_interface();
1346 assert(!result || k->is_instance_klass(),
1347 "all interfaces are instance types");
1348 // The compiler intrinsic for isInterface tests the
1349 // Klass::_access_flags bits in the same way.
1350 return result;
1351 JVM_END
1352
1353 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1354 oop mirror = JNIHandles::resolve_non_null(cls);
1355 if (java_lang_Class::is_primitive(mirror)) {
1356 return JNI_FALSE;
1357 }
1358 Klass* k = java_lang_Class::as_Klass(mirror);
1359 return k->is_hidden();
1360 JVM_END
1361
1362 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls))
1363 oop mirror = JNIHandles::resolve_non_null(cls);
1364 if (java_lang_Class::is_primitive(mirror)) {
1365 return JNI_FALSE;
1366 }
1367 Klass* k = java_lang_Class::as_Klass(mirror);
1368 if (EnableValhalla) {
1369 return k->is_array_klass() || k->is_identity_class();
1370 } else {
1371 return k->is_interface() ? JNI_FALSE : JNI_TRUE;
1372 }
1373 JVM_END
1374
1375 JVM_ENTRY(jboolean, JVM_IsImplicitlyConstructibleClass(JNIEnv *env, jclass cls))
1376 oop mirror = JNIHandles::resolve_non_null(cls);
1377 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1378 return ik->is_implicitly_constructible();
1379 JVM_END
1380
1381
1382 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1383 oop mirror = JNIHandles::resolve_non_null(cls);
1384 if (mirror == nullptr) {
1385 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1386 }
1387
1388 if (java_lang_Class::is_primitive(mirror)) {
1389 // Primitive types does not have a protection domain.
1390 return nullptr;
1391 }
1392
1393 oop pd = java_lang_Class::protection_domain(mirror);
1394 return (jobject) JNIHandles::make_local(THREAD, pd);
1395 JVM_END
1396
1397
1398 // Returns the inherited_access_control_context field of the running thread.
1399 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1400 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1401 return JNIHandles::make_local(THREAD, result);
1402 JVM_END
1403
1404 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1405 if (!UsePrivilegedStack) return nullptr;
1406
1407 ResourceMark rm(THREAD);
1408 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1409 JvmtiVMObjectAllocEventCollector oam;
1410
1411 // count the protection domains on the execution stack. We collapse
1412 // duplicate consecutive protection domains into a single one, as
1413 // well as stopping when we hit a privileged frame.
1414
1415 oop previous_protection_domain = nullptr;
1416 Handle privileged_context(thread, nullptr);
1417 bool is_privileged = false;
1418 oop protection_domain = nullptr;
1419
1420 // Iterate through Java frames
1421 vframeStream vfst(thread);
1422 for(; !vfst.at_end(); vfst.next()) {
1423 // get method of frame
1424 Method* method = vfst.method();
1425
1426 // stop at the first privileged frame
1427 if (method->method_holder() == vmClasses::AccessController_klass() &&
1428 method->name() == vmSymbols::executePrivileged_name())
1429 {
1430 // this frame is privileged
1431 is_privileged = true;
1432
1433 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1434
1435 StackValueCollection* locals = priv->locals();
1436 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1437 StackValue* clr_sv = locals->at(2); // Class<?> caller
1438 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1439 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1440 privileged_context = ctx_sv->get_obj();
1441 Handle caller = clr_sv->get_obj();
1442
1443 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1444 protection_domain = caller_klass->protection_domain();
1445 } else {
1446 protection_domain = method->method_holder()->protection_domain();
1447 }
1448
1449 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1450 local_array->push(Handle(thread, protection_domain));
1451 previous_protection_domain = protection_domain;
1452 }
1453
1454 if (is_privileged) break;
1455 }
1456
1457
1458 // either all the domains on the stack were system domains, or
1459 // we had a privileged system domain
1460 if (local_array->is_empty()) {
1461 if (is_privileged && privileged_context.is_null()) return nullptr;
1462
1463 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1464 return JNIHandles::make_local(THREAD, result);
1465 }
1466
1467 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1468 local_array->length(), CHECK_NULL);
1469 objArrayHandle h_context(thread, context);
1470 for (int index = 0; index < local_array->length(); index++) {
1471 h_context->obj_at_put(index, local_array->at(index)());
1472 }
1473
1474 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1475
1476 return JNIHandles::make_local(THREAD, result);
1477 JVM_END
1478
1479 class ScopedValueBindingsResolver {
1480 public:
1481 InstanceKlass* Carrier_klass;
1482 ScopedValueBindingsResolver(JavaThread* THREAD) {
1483 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1484 Carrier_klass = InstanceKlass::cast(k);
1485 }
1486 };
1487
1488 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1489 ResourceMark rm(THREAD);
1490 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1491 JvmtiVMObjectAllocEventCollector oam;
1492
1493 static ScopedValueBindingsResolver resolver(THREAD);
1494
1495 // Iterate through Java frames
1496 vframeStream vfst(thread);
1497 for(; !vfst.at_end(); vfst.next()) {
1498 int loc = -1;
1499 // get method of frame
1500 Method* method = vfst.method();
1501
1502 Symbol *name = method->name();
1503
1504 InstanceKlass* holder = method->method_holder();
1505 if (name == vmSymbols::runWith_method_name()) {
1506 if (holder == vmClasses::Thread_klass()
1507 || holder == resolver.Carrier_klass) {
1508 loc = 1;
1509 }
1510 }
1511
1512 if (loc != -1) {
1513 javaVFrame *frame = vfst.asJavaVFrame();
1514 StackValueCollection* locals = frame->locals();
1515 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1516 Handle result = head_sv->get_obj();
1517 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1518 if (result() != nullptr) {
1519 return JNIHandles::make_local(THREAD, result());
1520 }
1521 }
1522 }
1523
1524 return nullptr;
1525 JVM_END
1526
1527 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1529 return (k != nullptr) && k->is_array_klass() ? true : false;
1530 JVM_END
1531
1532
1533 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1534 oop mirror = JNIHandles::resolve_non_null(cls);
1535 return (jboolean) java_lang_Class::is_primitive(mirror);
1536 JVM_END
1537
1538
1539 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1540 oop mirror = JNIHandles::resolve_non_null(cls);
1541 if (java_lang_Class::is_primitive(mirror)) {
1542 // Primitive type
1543 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1544 }
1545
1546 Klass* k = java_lang_Class::as_Klass(mirror);
1547 debug_only(int computed_modifiers = k->compute_modifier_flags());
1548 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1549 return k->modifier_flags();
1550 JVM_END
1551
1552
1553 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1554
1555 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1556 JvmtiVMObjectAllocEventCollector oam;
1557 // ofClass is a reference to a java_lang_Class object. The mirror object
1558 // of an InstanceKlass
1559 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1560 if (java_lang_Class::is_primitive(ofMirror) ||
1561 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1562 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1563 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1564 }
1565
1566 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1567 InnerClassesIterator iter(k);
1568
1569 if (iter.length() == 0) {
1570 // Neither an inner nor outer class
1571 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1572 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1573 }
1574
1575 // find inner class info
1576 constantPoolHandle cp(thread, k->constants());
1577 int length = iter.length();
1578
1579 // Allocate temp. result array
1580 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1581 objArrayHandle result (THREAD, r);
1582 int members = 0;
1583
1584 for (; !iter.done(); iter.next()) {
1585 int ioff = iter.inner_class_info_index();
1586 int ooff = iter.outer_class_info_index();
1587
1588 if (ioff != 0 && ooff != 0) {
1589 // Check to see if the name matches the class we're looking for
1590 // before attempting to find the class.
1591 if (cp->klass_name_at_matches(k, ooff)) {
1592 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1593 if (outer_klass == k) {
1594 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1595 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1596
1597 // Throws an exception if outer klass has not declared k as
1598 // an inner klass
1599 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1600
1601 result->obj_at_put(members, inner_klass->java_mirror());
1602 members++;
1603 }
1604 }
1605 }
1606 }
1607
1608 if (members != length) {
1609 // Return array of right length
1610 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1611 for(int i = 0; i < members; i++) {
1612 res->obj_at_put(i, result->obj_at(i));
1613 }
1614 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1615 }
1616
1617 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1618 JVM_END
1619
1620
1621 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1622 {
1623 // ofClass is a reference to a java_lang_Class object.
1624 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1625 if (java_lang_Class::is_primitive(ofMirror)) {
1626 return nullptr;
1627 }
1628 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1629 if (!klass->is_instance_klass()) {
1630 return nullptr;
1631 }
1632
1633 bool inner_is_member = false;
1634 Klass* outer_klass
1635 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1636 if (outer_klass == nullptr) return nullptr; // already a top-level class
1637 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1638 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1639 }
1640 JVM_END
1641
1642 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1643 {
1644 oop mirror = JNIHandles::resolve_non_null(cls);
1645 if (java_lang_Class::is_primitive(mirror)) {
1646 return nullptr;
1647 }
1648 Klass* klass = java_lang_Class::as_Klass(mirror);
1649 if (!klass->is_instance_klass()) {
1650 return nullptr;
1651 }
1652 InstanceKlass* k = InstanceKlass::cast(klass);
1653 int ooff = 0, noff = 0;
1654 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1655 if (noff != 0) {
1656 constantPoolHandle i_cp(thread, k->constants());
1657 Symbol* name = i_cp->symbol_at(noff);
1658 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1659 return (jstring) JNIHandles::make_local(THREAD, str());
1660 }
1661 }
1662 return nullptr;
1663 }
1664 JVM_END
1665
1666 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1667 assert (cls != nullptr, "illegal class");
1668 JvmtiVMObjectAllocEventCollector oam;
1669 ResourceMark rm(THREAD);
1670 oop mirror = JNIHandles::resolve_non_null(cls);
1671 // Return null for arrays and primitives
1672 if (!java_lang_Class::is_primitive(mirror)) {
1673 Klass* k = java_lang_Class::as_Klass(mirror);
1674 if (k->is_instance_klass()) {
1675 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1676 if (sym == nullptr) return nullptr;
1677 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1678 return (jstring) JNIHandles::make_local(THREAD, str());
1679 }
1680 }
1681 return nullptr;
1682 JVM_END
1683
1684
1685 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1686 assert (cls != nullptr, "illegal class");
1687 oop mirror = JNIHandles::resolve_non_null(cls);
1688 // Return null for arrays and primitives
1689 if (!java_lang_Class::is_primitive(mirror)) {
1690 Klass* k = java_lang_Class::as_Klass(mirror);
1691 if (k->is_instance_klass()) {
1692 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1693 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1694 }
1695 }
1696 return nullptr;
1697 JVM_END
1698
1699
1700 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1701 // some of this code was adapted from from jni_FromReflectedField
1702
1703 oop reflected = JNIHandles::resolve_non_null(field);
1704 oop mirror = java_lang_reflect_Field::clazz(reflected);
1705 Klass* k = java_lang_Class::as_Klass(mirror);
1706 int slot = java_lang_reflect_Field::slot(reflected);
1707 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1708
1709 InstanceKlass* ik = InstanceKlass::cast(k);
1710 int offset = ik->field_offset(slot);
1711
1712 if (modifiers & JVM_ACC_STATIC) {
1713 // for static fields we only look in the current class
1714 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1715 assert(false, "cannot find static field");
1716 return false;
1717 }
1718 } else {
1719 // for instance fields we start with the current class and work
1720 // our way up through the superclass chain
1721 if (!ik->find_field_from_offset(offset, false, &fd)) {
1722 assert(false, "cannot find instance field");
1723 return false;
1724 }
1725 }
1726 return true;
1727 }
1728
1729 static Method* jvm_get_method_common(jobject method) {
1730 // some of this code was adapted from from jni_FromReflectedMethod
1731
1732 oop reflected = JNIHandles::resolve_non_null(method);
1733 oop mirror = nullptr;
1734 int slot = 0;
1735
1736 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1737 mirror = java_lang_reflect_Constructor::clazz(reflected);
1738 slot = java_lang_reflect_Constructor::slot(reflected);
1739 } else {
1740 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1741 "wrong type");
1742 mirror = java_lang_reflect_Method::clazz(reflected);
1743 slot = java_lang_reflect_Method::slot(reflected);
1744 }
1745 Klass* k = java_lang_Class::as_Klass(mirror);
1746
1747 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1748 assert(m != nullptr, "cannot find method");
1749 return m; // caller has to deal with null in product mode
1750 }
1751
1752 /* Type use annotations support (JDK 1.8) */
1753
1754 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1755 assert (cls != nullptr, "illegal class");
1756 ResourceMark rm(THREAD);
1757 // Return null for arrays and primitives
1758 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1759 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1760 if (k->is_instance_klass()) {
1761 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1762 if (type_annotations != nullptr) {
1763 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1764 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1765 }
1766 }
1767 }
1768 return nullptr;
1769 JVM_END
1770
1771 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1772 assert (method != nullptr, "illegal method");
1773 // method is a handle to a java.lang.reflect.Method object
1774 Method* m = jvm_get_method_common(method);
1775 if (m == nullptr) {
1776 return nullptr;
1777 }
1778
1779 AnnotationArray* type_annotations = m->type_annotations();
1780 if (type_annotations != nullptr) {
1781 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1782 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1783 }
1784
1785 return nullptr;
1786 JVM_END
1787
1788 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1789 assert (field != nullptr, "illegal field");
1790 fieldDescriptor fd;
1791 bool gotFd = jvm_get_field_common(field, fd);
1792 if (!gotFd) {
1793 return nullptr;
1794 }
1795
1796 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1797 JVM_END
1798
1799 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1800 if (!cp->is_within_bounds(index)) {
1801 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1802 }
1803 }
1804
1805 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1806 {
1807 // method is a handle to a java.lang.reflect.Method object
1808 Method* method_ptr = jvm_get_method_common(method);
1809 methodHandle mh (THREAD, method_ptr);
1810 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1811 const int num_params = mh->method_parameters_length();
1812
1813 if (num_params < 0) {
1814 // A -1 return value from method_parameters_length means there is no
1815 // parameter data. Return null to indicate this to the reflection
1816 // API.
1817 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1818 return (jobjectArray)nullptr;
1819 } else {
1820 // Otherwise, we return something up to reflection, even if it is
1821 // a zero-length array. Why? Because in some cases this can
1822 // trigger a MalformedParametersException.
1823
1824 // make sure all the symbols are properly formatted
1825 for (int i = 0; i < num_params; i++) {
1826 MethodParametersElement* params = mh->method_parameters_start();
1827 int index = params[i].name_cp_index;
1828 constantPoolHandle cp(THREAD, mh->constants());
1829 bounds_check(cp, index, CHECK_NULL);
1830
1831 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1832 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1833 "Wrong type at constant pool index");
1834 }
1835
1836 }
1837
1838 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1839 objArrayHandle result (THREAD, result_oop);
1840
1841 for (int i = 0; i < num_params; i++) {
1842 MethodParametersElement* params = mh->method_parameters_start();
1843 // For a 0 index, give a null symbol
1844 Symbol* sym = 0 != params[i].name_cp_index ?
1845 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1846 int flags = params[i].flags;
1847 oop param = Reflection::new_parameter(reflected_method, i, sym,
1848 flags, CHECK_NULL);
1849 result->obj_at_put(i, param);
1850 }
1851 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1852 }
1853 }
1854 JVM_END
1855
1856 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1857
1858 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1859 {
1860 JvmtiVMObjectAllocEventCollector oam;
1861
1862 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1863 // Exclude primitive types and array types
1864 if (java_lang_Class::is_primitive(ofMirror) ||
1865 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1866 // Return empty array
1867 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1868 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1869 }
1870
1871 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1872 constantPoolHandle cp(THREAD, k->constants());
1873
1874 // Ensure class is linked
1875 k->link_class(CHECK_NULL);
1876
1877 // Allocate result
1878 int num_fields;
1879
1880 if (publicOnly) {
1881 num_fields = 0;
1882 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1883 if (fs.access_flags().is_public()) ++num_fields;
1884 }
1885 } else {
1886 num_fields = k->java_fields_count();
1887 }
1888
1889 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1890 objArrayHandle result (THREAD, r);
1891
1892 int out_idx = 0;
1893 fieldDescriptor fd;
1894 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1895 if (!publicOnly || fs.access_flags().is_public()) {
1896 fd.reinitialize(k, fs.index());
1897 oop field = Reflection::new_field(&fd, CHECK_NULL);
1898 result->obj_at_put(out_idx, field);
1899 ++out_idx;
1900 }
1901 }
1902 assert(out_idx == num_fields, "just checking");
1903 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1904 }
1905 JVM_END
1906
1907 // A class is a record if and only if it is final and a direct subclass of
1908 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1909 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1910 {
1911 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1912 if (k != nullptr && k->is_instance_klass()) {
1913 InstanceKlass* ik = InstanceKlass::cast(k);
1914 return ik->is_record();
1915 } else {
1916 return false;
1917 }
1918 }
1919 JVM_END
1920
1921 // Returns an array containing the components of the Record attribute,
1922 // or null if the attribute is not present.
1923 //
1924 // Note that this function returns the components of the Record attribute
1925 // even if the class is not a record.
1926 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1927 {
1928 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1929 assert(c->is_instance_klass(), "must be");
1930 InstanceKlass* ik = InstanceKlass::cast(c);
1931
1932 Array<RecordComponent*>* components = ik->record_components();
1933 if (components != nullptr) {
1934 JvmtiVMObjectAllocEventCollector oam;
1935 constantPoolHandle cp(THREAD, ik->constants());
1936 int length = components->length();
1937 assert(length >= 0, "unexpected record_components length");
1938 objArrayOop record_components =
1939 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1940 objArrayHandle components_h (THREAD, record_components);
1941
1942 for (int x = 0; x < length; x++) {
1943 RecordComponent* component = components->at(x);
1944 assert(component != nullptr, "unexpected null record component");
1945 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1946 components_h->obj_at_put(x, component_oop);
1947 }
1948 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1949 }
1950
1951 return nullptr;
1952 }
1953 JVM_END
1954
1955 static jobjectArray get_class_declared_methods_helper(
1956 JNIEnv *env,
1957 jclass ofClass, jboolean publicOnly,
1958 bool want_constructor,
1959 Klass* klass, TRAPS) {
1960
1961 JvmtiVMObjectAllocEventCollector oam;
1962
1963 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1964 // Exclude primitive types and array types
1965 if (java_lang_Class::is_primitive(ofMirror)
1966 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1967 // Return empty array
1968 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1969 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1970 }
1971
1972 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1973
1974 // Ensure class is linked
1975 k->link_class(CHECK_NULL);
1976
1977 Array<Method*>* methods = k->methods();
1978 int methods_length = methods->length();
1979
1980 // Save original method_idnum in case of redefinition, which can change
1981 // the idnum of obsolete methods. The new method will have the same idnum
1982 // but if we refresh the methods array, the counts will be wrong.
1983 ResourceMark rm(THREAD);
1984 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1985 int num_methods = 0;
1986
1987 // Select methods matching the criteria.
1988 for (int i = 0; i < methods_length; i++) {
1989 Method* method = methods->at(i);
1990 if (want_constructor && !method->is_object_constructor()) {
1991 continue;
1992 }
1993 if (!want_constructor &&
1994 (method->is_object_constructor() || method->is_class_initializer() ||
1995 method->is_overpass())) {
1996 continue;
1997 }
1998 if (publicOnly && !method->is_public()) {
1999 continue;
2000 }
2001 idnums->push(method->method_idnum());
2002 ++num_methods;
2003 }
2004
2005 // Allocate result
2006 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
2007 objArrayHandle result (THREAD, r);
2008
2009 // Now just put the methods that we selected above, but go by their idnum
2010 // in case of redefinition. The methods can be redefined at any safepoint,
2011 // so above when allocating the oop array and below when creating reflect
2012 // objects.
2013 for (int i = 0; i < num_methods; i++) {
2014 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
2015 if (method.is_null()) {
2016 // Method may have been deleted and seems this API can handle null
2017 // Otherwise should probably put a method that throws NSME
2018 result->obj_at_put(i, nullptr);
2019 } else {
2020 oop m;
2021 if (want_constructor) {
2022 assert(method->is_object_constructor(), "must be");
2023 m = Reflection::new_constructor(method, CHECK_NULL);
2024 } else {
2025 m = Reflection::new_method(method, false, CHECK_NULL);
2026 }
2027 result->obj_at_put(i, m);
2028 }
2029 }
2030
2031 return (jobjectArray) JNIHandles::make_local(THREAD, result());
2032 }
2033
2034 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2035 {
2036 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2037 /*want_constructor*/ false,
2038 vmClasses::reflect_Method_klass(), THREAD);
2039 }
2040 JVM_END
2041
2042 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2043 {
2044 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2045 /*want_constructor*/ true,
2046 vmClasses::reflect_Constructor_klass(), THREAD);
2047 }
2048 JVM_END
2049
2050 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2051 {
2052 oop mirror = JNIHandles::resolve_non_null(cls);
2053 if (java_lang_Class::is_primitive(mirror)) {
2054 // Primitive type
2055 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2056 }
2057
2058 Klass* k = java_lang_Class::as_Klass(mirror);
2059 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2060 }
2061 JVM_END
2062
2063 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2064 {
2065 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2066 assert(c->is_instance_klass(), "must be");
2067 InstanceKlass* ck = InstanceKlass::cast(c);
2068 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2069 assert(m->is_instance_klass(), "must be");
2070 InstanceKlass* mk = InstanceKlass::cast(m);
2071 return ck->has_nestmate_access_to(mk, THREAD);
2072 }
2073 JVM_END
2074
2075 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2076 {
2077 // current is not a primitive or array class
2078 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2079 assert(c->is_instance_klass(), "must be");
2080 InstanceKlass* ck = InstanceKlass::cast(c);
2081 InstanceKlass* host = ck->nest_host(THREAD);
2082 return (jclass) (host == nullptr ? nullptr :
2083 JNIHandles::make_local(THREAD, host->java_mirror()));
2084 }
2085 JVM_END
2086
2087 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2088 {
2089 // current is not a primitive or array class
2090 ResourceMark rm(THREAD);
2091 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2092 assert(c->is_instance_klass(), "must be");
2093 InstanceKlass* ck = InstanceKlass::cast(c);
2094 InstanceKlass* host = ck->nest_host(THREAD);
2095
2096 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2097 ck->external_name(), host->external_name());
2098 {
2099 JvmtiVMObjectAllocEventCollector oam;
2100 Array<u2>* members = host->nest_members();
2101 int length = members == nullptr ? 0 : members->length();
2102
2103 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2104
2105 // nest host is first in the array so make it one bigger
2106 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2107 length + 1, CHECK_NULL);
2108 objArrayHandle result(THREAD, r);
2109 result->obj_at_put(0, host->java_mirror());
2110 if (length != 0) {
2111 int count = 0;
2112 for (int i = 0; i < length; i++) {
2113 int cp_index = members->at(i);
2114 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2115 if (HAS_PENDING_EXCEPTION) {
2116 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2117 return nullptr; // propagate VMEs
2118 }
2119 if (log_is_enabled(Trace, class, nestmates)) {
2120 stringStream ss;
2121 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2122 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2123 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2124 log_trace(class, nestmates)("%s", ss.as_string());
2125 }
2126 CLEAR_PENDING_EXCEPTION;
2127 continue;
2128 }
2129 if (k->is_instance_klass()) {
2130 InstanceKlass* ik = InstanceKlass::cast(k);
2131 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2132 if (nest_host_k == host) {
2133 result->obj_at_put(count+1, k->java_mirror());
2134 count++;
2135 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2136 } else {
2137 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2138 ik->external_name(), nest_host_k->external_name());
2139 }
2140 } else {
2141 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2142 k->external_name());
2143 }
2144 }
2145 if (count < length) {
2146 // we had invalid entries so we need to compact the array
2147 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2148 length + 1, count + 1);
2149
2150 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2151 count + 1, CHECK_NULL);
2152 objArrayHandle result2(THREAD, r2);
2153 for (int i = 0; i < count + 1; i++) {
2154 result2->obj_at_put(i, result->obj_at(i));
2155 }
2156 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2157 }
2158 }
2159 else {
2160 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2161 }
2162 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2163 }
2164 }
2165 JVM_END
2166
2167 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2168 {
2169 oop mirror = JNIHandles::resolve_non_null(current);
2170 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2171 Klass* c = java_lang_Class::as_Klass(mirror);
2172 assert(c->is_instance_klass(), "must be");
2173 InstanceKlass* ik = InstanceKlass::cast(c);
2174 ResourceMark rm(THREAD);
2175 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2176 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2177 if (ik->is_sealed()) {
2178 JvmtiVMObjectAllocEventCollector oam;
2179 Array<u2>* subclasses = ik->permitted_subclasses();
2180 int length = subclasses->length();
2181
2182 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2183
2184 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2185 length, CHECK_NULL);
2186 objArrayHandle result(THREAD, r);
2187 int count = 0;
2188 for (int i = 0; i < length; i++) {
2189 int cp_index = subclasses->at(i);
2190 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2191 if (HAS_PENDING_EXCEPTION) {
2192 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2193 return nullptr; // propagate VMEs
2194 }
2195 if (log_is_enabled(Trace, class, sealed)) {
2196 stringStream ss;
2197 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2198 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2199 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2200 log_trace(class, sealed)("%s", ss.as_string());
2201 }
2202
2203 CLEAR_PENDING_EXCEPTION;
2204 continue;
2205 }
2206 if (k->is_instance_klass()) {
2207 result->obj_at_put(count++, k->java_mirror());
2208 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2209 }
2210 }
2211 if (count < length) {
2212 // we had invalid entries so we need to compact the array
2213 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2214 count, CHECK_NULL);
2215 objArrayHandle result2(THREAD, r2);
2216 for (int i = 0; i < count; i++) {
2217 result2->obj_at_put(i, result->obj_at(i));
2218 }
2219 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2220 }
2221 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2222 } else {
2223 return nullptr;
2224 }
2225 }
2226 JVM_END
2227
2228 // Constant pool access //////////////////////////////////////////////////////////
2229
2230 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2231 {
2232 JvmtiVMObjectAllocEventCollector oam;
2233 oop mirror = JNIHandles::resolve_non_null(cls);
2234 // Return null for primitives and arrays
2235 if (!java_lang_Class::is_primitive(mirror)) {
2236 Klass* k = java_lang_Class::as_Klass(mirror);
2237 if (k->is_instance_klass()) {
2238 InstanceKlass* k_h = InstanceKlass::cast(k);
2239 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2240 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2241 return JNIHandles::make_local(THREAD, jcp());
2242 }
2243 }
2244 return nullptr;
2245 }
2246 JVM_END
2247
2248
2249 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2250 {
2251 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2252 return cp->length();
2253 }
2254 JVM_END
2255
2256
2257 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2258 {
2259 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2260 bounds_check(cp, index, CHECK_NULL);
2261 constantTag tag = cp->tag_at(index);
2262 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2263 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2264 }
2265 Klass* k = cp->klass_at(index, CHECK_NULL);
2266 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2267 }
2268 JVM_END
2269
2270 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2271 {
2272 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2273 bounds_check(cp, index, CHECK_NULL);
2274 constantTag tag = cp->tag_at(index);
2275 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2276 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2277 }
2278 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2279 if (k == nullptr) return nullptr;
2280 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2281 }
2282 JVM_END
2283
2284 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2285 constantTag tag = cp->tag_at(index);
2286 if (!tag.is_method() && !tag.is_interface_method()) {
2287 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2288 }
2289 int klass_ref = cp->uncached_klass_ref_index_at(index);
2290 Klass* k_o;
2291 if (force_resolution) {
2292 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2293 } else {
2294 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2295 if (k_o == nullptr) return nullptr;
2296 }
2297 InstanceKlass* k = InstanceKlass::cast(k_o);
2298 Symbol* name = cp->uncached_name_ref_at(index);
2299 Symbol* sig = cp->uncached_signature_ref_at(index);
2300 methodHandle m (THREAD, k->find_method(name, sig));
2301 if (m.is_null()) {
2302 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2303 }
2304 oop method;
2305 if (m->is_object_constructor()) {
2306 method = Reflection::new_constructor(m, CHECK_NULL);
2307 } else {
2308 method = Reflection::new_method(m, true, CHECK_NULL);
2309 }
2310 return JNIHandles::make_local(THREAD, method);
2311 }
2312
2313 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2314 {
2315 JvmtiVMObjectAllocEventCollector oam;
2316 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2317 bounds_check(cp, index, CHECK_NULL);
2318 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2319 return res;
2320 }
2321 JVM_END
2322
2323 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2324 {
2325 JvmtiVMObjectAllocEventCollector oam;
2326 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2327 bounds_check(cp, index, CHECK_NULL);
2328 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2329 return res;
2330 }
2331 JVM_END
2332
2333 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2334 constantTag tag = cp->tag_at(index);
2335 if (!tag.is_field()) {
2336 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2337 }
2338 int klass_ref = cp->uncached_klass_ref_index_at(index);
2339 Klass* k_o;
2340 if (force_resolution) {
2341 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2342 } else {
2343 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2344 if (k_o == nullptr) return nullptr;
2345 }
2346 InstanceKlass* k = InstanceKlass::cast(k_o);
2347 Symbol* name = cp->uncached_name_ref_at(index);
2348 Symbol* sig = cp->uncached_signature_ref_at(index);
2349 fieldDescriptor fd;
2350 Klass* target_klass = k->find_field(name, sig, &fd);
2351 if (target_klass == nullptr) {
2352 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2353 }
2354 oop field = Reflection::new_field(&fd, CHECK_NULL);
2355 return JNIHandles::make_local(THREAD, field);
2356 }
2357
2358 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2359 {
2360 JvmtiVMObjectAllocEventCollector oam;
2361 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2362 bounds_check(cp, index, CHECK_NULL);
2363 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2364 return res;
2365 }
2366 JVM_END
2367
2368 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2369 {
2370 JvmtiVMObjectAllocEventCollector oam;
2371 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2372 bounds_check(cp, index, CHECK_NULL);
2373 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2374 return res;
2375 }
2376 JVM_END
2377
2378 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2379 {
2380 JvmtiVMObjectAllocEventCollector oam;
2381 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2382 bounds_check(cp, index, CHECK_NULL);
2383 constantTag tag = cp->tag_at(index);
2384 if (!tag.is_field_or_method()) {
2385 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2386 }
2387 int klass_ref = cp->uncached_klass_ref_index_at(index);
2388 Symbol* klass_name = cp->klass_name_at(klass_ref);
2389 Symbol* member_name = cp->uncached_name_ref_at(index);
2390 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2391 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2392 objArrayHandle dest(THREAD, dest_o);
2393 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2394 dest->obj_at_put(0, str());
2395 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2396 dest->obj_at_put(1, str());
2397 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2398 dest->obj_at_put(2, str());
2399 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2400 }
2401 JVM_END
2402
2403 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2404 {
2405 JvmtiVMObjectAllocEventCollector oam;
2406 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2407 bounds_check(cp, index, CHECK_0);
2408 constantTag tag = cp->tag_at(index);
2409 if (!tag.is_field_or_method()) {
2410 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2411 }
2412 return (jint) cp->uncached_klass_ref_index_at(index);
2413 }
2414 JVM_END
2415
2416 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2417 {
2418 JvmtiVMObjectAllocEventCollector oam;
2419 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2420 bounds_check(cp, index, CHECK_0);
2421 constantTag tag = cp->tag_at(index);
2422 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2423 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2424 }
2425 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2426 }
2427 JVM_END
2428
2429 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2430 {
2431 JvmtiVMObjectAllocEventCollector oam;
2432 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2433 bounds_check(cp, index, CHECK_NULL);
2434 constantTag tag = cp->tag_at(index);
2435 if (!tag.is_name_and_type()) {
2436 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2437 }
2438 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2439 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2440 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2441 objArrayHandle dest(THREAD, dest_o);
2442 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2443 dest->obj_at_put(0, str());
2444 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2445 dest->obj_at_put(1, str());
2446 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2447 }
2448 JVM_END
2449
2450 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2451 {
2452 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2453 bounds_check(cp, index, CHECK_0);
2454 constantTag tag = cp->tag_at(index);
2455 if (!tag.is_int()) {
2456 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2457 }
2458 return cp->int_at(index);
2459 }
2460 JVM_END
2461
2462 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2463 {
2464 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2465 bounds_check(cp, index, CHECK_(0L));
2466 constantTag tag = cp->tag_at(index);
2467 if (!tag.is_long()) {
2468 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2469 }
2470 return cp->long_at(index);
2471 }
2472 JVM_END
2473
2474 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2475 {
2476 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2477 bounds_check(cp, index, CHECK_(0.0f));
2478 constantTag tag = cp->tag_at(index);
2479 if (!tag.is_float()) {
2480 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2481 }
2482 return cp->float_at(index);
2483 }
2484 JVM_END
2485
2486 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2487 {
2488 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2489 bounds_check(cp, index, CHECK_(0.0));
2490 constantTag tag = cp->tag_at(index);
2491 if (!tag.is_double()) {
2492 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2493 }
2494 return cp->double_at(index);
2495 }
2496 JVM_END
2497
2498 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2499 {
2500 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2501 bounds_check(cp, index, CHECK_NULL);
2502 constantTag tag = cp->tag_at(index);
2503 if (!tag.is_string()) {
2504 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2505 }
2506 oop str = cp->string_at(index, CHECK_NULL);
2507 return (jstring) JNIHandles::make_local(THREAD, str);
2508 }
2509 JVM_END
2510
2511 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2512 {
2513 JvmtiVMObjectAllocEventCollector oam;
2514 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2515 bounds_check(cp, index, CHECK_NULL);
2516 constantTag tag = cp->tag_at(index);
2517 if (!tag.is_symbol()) {
2518 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2519 }
2520 Symbol* sym = cp->symbol_at(index);
2521 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2522 return (jstring) JNIHandles::make_local(THREAD, str());
2523 }
2524 JVM_END
2525
2526 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2527 {
2528 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2529 bounds_check(cp, index, CHECK_0);
2530 constantTag tag = cp->tag_at(index);
2531 jbyte result = tag.value();
2532 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2533 // they are changed to the corresponding tags from the JVM spec, so that java code in
2534 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2535 if (tag.is_klass_or_reference()) {
2536 result = JVM_CONSTANT_Class;
2537 } else if (tag.is_string_index()) {
2538 result = JVM_CONSTANT_String;
2539 } else if (tag.is_method_type_in_error()) {
2540 result = JVM_CONSTANT_MethodType;
2541 } else if (tag.is_method_handle_in_error()) {
2542 result = JVM_CONSTANT_MethodHandle;
2543 } else if (tag.is_dynamic_constant_in_error()) {
2544 result = JVM_CONSTANT_Dynamic;
2545 }
2546 return result;
2547 }
2548 JVM_END
2549
2550 // Assertion support. //////////////////////////////////////////////////////////
2551
2552 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2553 assert(cls != nullptr, "bad class");
2554
2555 oop r = JNIHandles::resolve(cls);
2556 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2557 if (java_lang_Class::is_primitive(r)) return false;
2558
2559 Klass* k = java_lang_Class::as_Klass(r);
2560 assert(k->is_instance_klass(), "must be an instance klass");
2561 if (!k->is_instance_klass()) return false;
2562
2563 ResourceMark rm(THREAD);
2564 const char* name = k->name()->as_C_string();
2565 bool system_class = k->class_loader() == nullptr;
2566 return JavaAssertions::enabled(name, system_class);
2567
2568 JVM_END
2569
2570
2571 // Return a new AssertionStatusDirectives object with the fields filled in with
2572 // command-line assertion arguments (i.e., -ea, -da).
2573 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2574 JvmtiVMObjectAllocEventCollector oam;
2575 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2576 return JNIHandles::make_local(THREAD, asd);
2577 JVM_END
2578
2579 // Arrays support /////////////////////////////////////////////////////////////
2580
2581 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2582 oop o = JNIHandles::resolve(array);
2583 Klass* k = o->klass();
2584 if ((o == nullptr) || (!k->is_array_klass())) {
2585 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2586 }
2587 return ArrayKlass::cast(k)->element_access_must_be_atomic();
2588 JVM_END
2589
2590 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2591 oop o = JNIHandles::resolve(array);
2592 Klass* k = o->klass();
2593 if ((o == nullptr) || (!k->is_array_klass())) {
2594 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2595 }
2596 if (k->is_flatArray_klass()) {
2597 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2598 if (!vk->element_access_must_be_atomic()) {
2599 /**
2600 * Need to decide how to implement:
2601 *
2602 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2603 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2604 * "checkcast" & "instanceof"
2605 *
2606 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2607 * possibly per instance lock structure. Said info, could be placed in
2608 * "trailer" rather than disturb the current arrayOop
2609 */
2610 Unimplemented();
2611 }
2612 }
2613 return array;
2614 JVM_END
2615
2616 // Verification ////////////////////////////////////////////////////////////////////////////////
2617
2618 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2619
2620 // RedefineClasses support: bug 6214132 caused verification to fail.
2621 // All functions from this section should call the jvmtiThreadSate function:
2622 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2623 // The function returns a Klass* of the _scratch_class if the verifier
2624 // was invoked in the middle of the class redefinition.
2625 // Otherwise it returns its argument value which is the _the_class Klass*.
2626 // Please, refer to the description in the jvmtiThreadSate.hpp.
2627
2628 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2629 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2630 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2631 return k->name()->as_utf8();
2632 JVM_END
2633
2634
2635 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2636 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2637 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2638 // types will have length zero if this is not an InstanceKlass
2639 // (length is determined by call to JVM_GetClassCPEntriesCount)
2640 if (k->is_instance_klass()) {
2641 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2642 for (int index = cp->length() - 1; index >= 0; index--) {
2643 constantTag tag = cp->tag_at(index);
2644 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2645 }
2646 }
2647 JVM_END
2648
2649
2650 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2651 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2652 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2653 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2654 JVM_END
2655
2656
2657 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2659 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2660 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2661 JVM_END
2662
2663
2664 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2665 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2666 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2667 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2668 JVM_END
2669
2670
2671 // The following methods, used for the verifier, are never called with
2672 // array klasses, so a direct cast to InstanceKlass is safe.
2673 // Typically, these methods are called in a loop with bounds determined
2674 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2675 // zero for arrays.
2676 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
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 int length = method->checked_exceptions_length();
2681 if (length > 0) {
2682 CheckedExceptionElement* table= method->checked_exceptions_start();
2683 for (int i = 0; i < length; i++) {
2684 exceptions[i] = table[i].class_cp_index;
2685 }
2686 }
2687 JVM_END
2688
2689
2690 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2691 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2692 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2693 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2694 return method->checked_exceptions_length();
2695 JVM_END
2696
2697
2698 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2699 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2700 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2701 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2702 memcpy(code, method->code_base(), method->code_size());
2703 JVM_END
2704
2705
2706 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2707 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2708 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2709 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2710 return method->code_size();
2711 JVM_END
2712
2713
2714 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2715 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2716 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2717 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2718 ExceptionTable extable(method);
2719 entry->start_pc = extable.start_pc(entry_index);
2720 entry->end_pc = extable.end_pc(entry_index);
2721 entry->handler_pc = extable.handler_pc(entry_index);
2722 entry->catchType = extable.catch_type_index(entry_index);
2723 JVM_END
2724
2725
2726 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2727 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2728 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2729 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2730 return method->exception_table_length();
2731 JVM_END
2732
2733
2734 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2735 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2736 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2737 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2738 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2739 JVM_END
2740
2741
2742 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2743 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2744 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2745 return InstanceKlass::cast(k)->field_access_flags(field_index);
2746 JVM_END
2747
2748
2749 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2750 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2751 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2752 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2753 return method->max_locals();
2754 JVM_END
2755
2756
2757 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2758 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2759 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2760 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2761 return method->size_of_parameters();
2762 JVM_END
2763
2764
2765 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2766 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2767 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2768 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2769 return method->verifier_max_stack();
2770 JVM_END
2771
2772
2773 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2774 ResourceMark rm(THREAD);
2775 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2776 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2777 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2778 return method->is_object_constructor();
2779 JVM_END
2780
2781
2782 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2783 ResourceMark rm(THREAD);
2784 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2785 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2786 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2787 return method->is_overpass();
2788 JVM_END
2789
2790 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2791 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2792 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2793 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2794 return method->name()->as_utf8();
2795 JVM_END
2796
2797
2798 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_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 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2802 return method->signature()->as_utf8();
2803 JVM_END
2804
2805 /**
2806 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2807 * read entries in the constant pool. Since the old verifier always
2808 * works on a copy of the code, it will not see any rewriting that
2809 * may possibly occur in the middle of verification. So it is important
2810 * that nothing it calls tries to use the cpCache instead of the raw
2811 * constant pool, so we must use cp->uncached_x methods when appropriate.
2812 */
2813 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2814 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2815 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2816 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2817 switch (cp->tag_at(cp_index).value()) {
2818 case JVM_CONSTANT_Fieldref:
2819 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2820 default:
2821 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2822 }
2823 ShouldNotReachHere();
2824 return nullptr;
2825 JVM_END
2826
2827
2828 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2829 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2830 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2831 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2832 switch (cp->tag_at(cp_index).value()) {
2833 case JVM_CONSTANT_InterfaceMethodref:
2834 case JVM_CONSTANT_Methodref:
2835 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2836 default:
2837 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2838 }
2839 ShouldNotReachHere();
2840 return nullptr;
2841 JVM_END
2842
2843
2844 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2845 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2846 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2847 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2848 switch (cp->tag_at(cp_index).value()) {
2849 case JVM_CONSTANT_InterfaceMethodref:
2850 case JVM_CONSTANT_Methodref:
2851 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2852 default:
2853 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2854 }
2855 ShouldNotReachHere();
2856 return nullptr;
2857 JVM_END
2858
2859
2860 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2861 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2862 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2863 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2864 switch (cp->tag_at(cp_index).value()) {
2865 case JVM_CONSTANT_Fieldref:
2866 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2867 default:
2868 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2869 }
2870 ShouldNotReachHere();
2871 return nullptr;
2872 JVM_END
2873
2874
2875 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2876 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2877 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2878 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2879 Symbol* classname = cp->klass_name_at(cp_index);
2880 return classname->as_utf8();
2881 JVM_END
2882
2883
2884 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2885 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2886 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2887 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2888 switch (cp->tag_at(cp_index).value()) {
2889 case JVM_CONSTANT_Fieldref: {
2890 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2891 Symbol* classname = cp->klass_name_at(class_index);
2892 return classname->as_utf8();
2893 }
2894 default:
2895 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2896 }
2897 ShouldNotReachHere();
2898 return nullptr;
2899 JVM_END
2900
2901
2902 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2903 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2904 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2905 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2906 switch (cp->tag_at(cp_index).value()) {
2907 case JVM_CONSTANT_Methodref:
2908 case JVM_CONSTANT_InterfaceMethodref: {
2909 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2910 Symbol* classname = cp->klass_name_at(class_index);
2911 return classname->as_utf8();
2912 }
2913 default:
2914 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2915 }
2916 ShouldNotReachHere();
2917 return nullptr;
2918 JVM_END
2919
2920
2921 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2922 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2923 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2924 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2925 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2926 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2927 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2928 switch (cp->tag_at(cp_index).value()) {
2929 case JVM_CONSTANT_Fieldref: {
2930 Symbol* name = cp->uncached_name_ref_at(cp_index);
2931 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2932 InstanceKlass* ik = InstanceKlass::cast(k_called);
2933 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2934 if (fs.name() == name && fs.signature() == signature) {
2935 return fs.access_flags().as_short();
2936 }
2937 }
2938 return -1;
2939 }
2940 default:
2941 fatal("JVM_GetCPFieldModifiers: illegal constant");
2942 }
2943 ShouldNotReachHere();
2944 return 0;
2945 JVM_END
2946
2947
2948 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2949 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2950 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2951 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2952 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2953 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2954 switch (cp->tag_at(cp_index).value()) {
2955 case JVM_CONSTANT_Methodref:
2956 case JVM_CONSTANT_InterfaceMethodref: {
2957 Symbol* name = cp->uncached_name_ref_at(cp_index);
2958 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2959 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2960 int methods_count = methods->length();
2961 for (int i = 0; i < methods_count; i++) {
2962 Method* method = methods->at(i);
2963 if (method->name() == name && method->signature() == signature) {
2964 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2965 }
2966 }
2967 return -1;
2968 }
2969 default:
2970 fatal("JVM_GetCPMethodModifiers: illegal constant");
2971 }
2972 ShouldNotReachHere();
2973 return 0;
2974 JVM_END
2975
2976
2977 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2978
2979 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2980 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2981 JVM_END
2982
2983
2984 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2985 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2986 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2987 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2988 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2989 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2990 JVM_END
2991
2992 // Printing support //////////////////////////////////////////////////
2993 extern "C" {
2994
2995 ATTRIBUTE_PRINTF(3, 0)
2996 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2997 // Reject count values that are negative signed values converted to
2998 // unsigned; see bug 4399518, 4417214
2999 if ((intptr_t)count <= 0) return -1;
3000
3001 int result = os::vsnprintf(str, count, fmt, args);
3002 if (result > 0 && (size_t)result >= count) {
3003 result = -1;
3004 }
3005
3006 return result;
3007 }
3008
3009 ATTRIBUTE_PRINTF(3, 4)
3010 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
3011 va_list args;
3012 int len;
3013 va_start(args, fmt);
3014 len = jio_vsnprintf(str, count, fmt, args);
3015 va_end(args);
3016 return len;
3017 }
3018
3019 ATTRIBUTE_PRINTF(2, 3)
3020 int jio_fprintf(FILE* f, const char *fmt, ...) {
3021 int len;
3022 va_list args;
3023 va_start(args, fmt);
3024 len = jio_vfprintf(f, fmt, args);
3025 va_end(args);
3026 return len;
3027 }
3028
3029 ATTRIBUTE_PRINTF(2, 0)
3030 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
3031 if (Arguments::vfprintf_hook() != nullptr) {
3032 return Arguments::vfprintf_hook()(f, fmt, args);
3033 } else {
3034 return vfprintf(f, fmt, args);
3035 }
3036 }
3037
3038 ATTRIBUTE_PRINTF(1, 2)
3039 JNIEXPORT int jio_printf(const char *fmt, ...) {
3040 int len;
3041 va_list args;
3042 va_start(args, fmt);
3043 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
3044 va_end(args);
3045 return len;
3046 }
3047
3048 // HotSpot specific jio method
3049 void jio_print(const char* s, size_t len) {
3050 // Try to make this function as atomic as possible.
3051 if (Arguments::vfprintf_hook() != nullptr) {
3052 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
3053 } else {
3054 // Make an unused local variable to avoid warning from gcc compiler.
3055 bool dummy = os::write(defaultStream::output_fd(), s, len);
3056 }
3057 }
3058
3059 } // Extern C
3060
3061 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3062
3063 // In most of the JVM thread support functions we need to access the
3064 // thread through a ThreadsListHandle to prevent it from exiting and
3065 // being reclaimed while we try to operate on it. The exceptions to this
3066 // rule are when operating on the current thread, or if the monitor of
3067 // the target java.lang.Thread is locked at the Java level - in both
3068 // cases the target cannot exit.
3069
3070 static void thread_entry(JavaThread* thread, TRAPS) {
3071 HandleMark hm(THREAD);
3072 Handle obj(THREAD, thread->threadObj());
3073 JavaValue result(T_VOID);
3074 JavaCalls::call_virtual(&result,
3075 obj,
3076 vmClasses::Thread_klass(),
3077 vmSymbols::run_method_name(),
3078 vmSymbols::void_method_signature(),
3079 THREAD);
3080 }
3081
3082
3083 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3084 #if INCLUDE_CDS
3085 if (CDSConfig::is_dumping_static_archive()) {
3086 // During java -Xshare:dump, if we allow multiple Java threads to
3087 // execute in parallel, symbols and classes may be loaded in
3088 // random orders which will make the resulting CDS archive
3089 // non-deterministic.
3090 //
3091 // Lucikly, during java -Xshare:dump, it's important to run only
3092 // the code in the main Java thread (which is NOT started here) that
3093 // creates the module graph, etc. It's safe to not start the other
3094 // threads which are launched by class static initializers
3095 // (ReferenceHandler, FinalizerThread and CleanerImpl).
3096 if (log_is_enabled(Info, cds)) {
3097 ResourceMark rm;
3098 oop t = JNIHandles::resolve_non_null(jthread);
3099 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
3100 }
3101 return;
3102 }
3103 #endif
3104 JavaThread *native_thread = nullptr;
3105
3106 // We cannot hold the Threads_lock when we throw an exception,
3107 // due to rank ordering issues. Example: we might need to grab the
3108 // Heap_lock while we construct the exception.
3109 bool throw_illegal_thread_state = false;
3110
3111 // We must release the Threads_lock before we can post a jvmti event
3112 // in Thread::start.
3113 {
3114 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
3115 // Ensure that the C++ Thread and OSThread structures aren't freed before
3116 // we operate.
3117 MutexLocker ml(Threads_lock);
3118
3119 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3120 // re-starting an already started thread, so we should usually find
3121 // that the JavaThread is null. However for a JNI attached thread
3122 // there is a small window between the Thread object being created
3123 // (with its JavaThread set) and the update to its threadStatus, so we
3124 // have to check for this
3125 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
3126 throw_illegal_thread_state = true;
3127 } else {
3128 jlong size =
3129 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3130 // Allocate the C++ Thread structure and create the native thread. The
3131 // stack size retrieved from java is 64-bit signed, but the constructor takes
3132 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3133 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3134 // - Avoid passing negative values which would result in really large stacks.
3135 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3136 size_t sz = size > 0 ? (size_t) size : 0;
3137 native_thread = new JavaThread(&thread_entry, sz);
3138
3139 // At this point it may be possible that no osthread was created for the
3140 // JavaThread due to lack of memory. Check for this situation and throw
3141 // an exception if necessary. Eventually we may want to change this so
3142 // that we only grab the lock if the thread was created successfully -
3143 // then we can also do this check and throw the exception in the
3144 // JavaThread constructor.
3145 if (native_thread->osthread() != nullptr) {
3146 // Note: the current thread is not being used within "prepare".
3147 native_thread->prepare(jthread);
3148 }
3149 }
3150 }
3151
3152 if (throw_illegal_thread_state) {
3153 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3154 }
3155
3156 assert(native_thread != nullptr, "Starting null thread?");
3157
3158 if (native_thread->osthread() == nullptr) {
3159 ResourceMark rm(thread);
3160 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3161 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3162 // No one should hold a reference to the 'native_thread'.
3163 native_thread->smr_delete();
3164 if (JvmtiExport::should_post_resource_exhausted()) {
3165 JvmtiExport::post_resource_exhausted(
3166 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3167 os::native_thread_creation_failed_msg());
3168 }
3169 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3170 os::native_thread_creation_failed_msg());
3171 }
3172
3173 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3174
3175 Thread::start(native_thread);
3176
3177 JVM_END
3178
3179
3180 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3181 ThreadsListHandle tlh(thread);
3182 oop java_thread = nullptr;
3183 JavaThread* receiver = nullptr;
3184 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3185 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3186
3187 if (is_alive) {
3188 // jthread refers to a live JavaThread.
3189 Thread::set_priority(receiver, (ThreadPriority)prio);
3190 }
3191 // Implied else: If the JavaThread hasn't started yet, then the
3192 // priority set in the java.lang.Thread object above will be pushed
3193 // down when it does start.
3194 JVM_END
3195
3196
3197 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3198 if (os::dont_yield()) return;
3199 HOTSPOT_THREAD_YIELD();
3200 os::naked_yield();
3201 JVM_END
3202
3203 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3204 if (nanos < 0) {
3205 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3206 }
3207
3208 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3209 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3210 }
3211
3212 // Save current thread state and restore it at the end of this block.
3213 // And set new thread state to SLEEPING.
3214 JavaThreadSleepState jtss(thread);
3215
3216 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3217
3218 if (nanos == 0) {
3219 os::naked_yield();
3220 } else {
3221 ThreadState old_state = thread->osthread()->get_state();
3222 thread->osthread()->set_state(SLEEPING);
3223 if (!thread->sleep_nanos(nanos)) { // interrupted
3224 // An asynchronous exception could have been thrown on
3225 // us while we were sleeping. We do not overwrite those.
3226 if (!HAS_PENDING_EXCEPTION) {
3227 HOTSPOT_THREAD_SLEEP_END(1);
3228
3229 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3230 // to properly restore the thread state. That's likely wrong.
3231 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3232 }
3233 }
3234 thread->osthread()->set_state(old_state);
3235 }
3236 HOTSPOT_THREAD_SLEEP_END(0);
3237 JVM_END
3238
3239 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3240 oop jthread = thread->threadObj();
3241 assert(jthread != nullptr, "no current carrier thread!");
3242 return JNIHandles::make_local(THREAD, jthread);
3243 JVM_END
3244
3245 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3246 oop theThread = thread->vthread();
3247 assert(theThread != (oop)nullptr, "no current thread!");
3248 return JNIHandles::make_local(THREAD, theThread);
3249 JVM_END
3250
3251 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3252 jobject theThread))
3253 oop threadObj = JNIHandles::resolve(theThread);
3254 thread->set_vthread(threadObj);
3255 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3256 JVM_END
3257
3258 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3259 return ThreadIdentifier::unsafe_offset();
3260 JVM_END
3261
3262 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3263 ThreadsListHandle tlh(thread);
3264 JavaThread* receiver = nullptr;
3265 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3266 if (is_alive) {
3267 // jthread refers to a live JavaThread.
3268 receiver->interrupt();
3269 }
3270 JVM_END
3271
3272 // Return true iff the current thread has locked the object passed in
3273
3274 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3275 if (obj == nullptr) {
3276 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3277 }
3278 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3279 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3280 JVM_END
3281
3282 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3283 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3284 return JNIHandles::make_local(THREAD, trace);
3285 JVM_END
3286
3287 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3288 // We don't use a ThreadsListHandle here because the current thread
3289 // must be alive.
3290 oop java_thread = JNIHandles::resolve_non_null(jthread);
3291 JavaThread* thr = java_lang_Thread::thread(java_thread);
3292 if (thread == thr && !thr->has_attached_via_jni()) {
3293 // Thread naming is only supported for the current thread and
3294 // we don't set the name of an attached thread to avoid stepping
3295 // on other programs.
3296 ResourceMark rm(thread);
3297 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3298 os::set_native_thread_name(thread_name);
3299 }
3300 JVM_END
3301
3302 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3303 oop theCache = thread->scopedValueCache();
3304 return JNIHandles::make_local(THREAD, theCache);
3305 JVM_END
3306
3307 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3308 jobject theCache))
3309 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3310 thread->set_scopedValueCache(objs);
3311 JVM_END
3312
3313 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3314
3315 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3316 ResourceMark rm(THREAD);
3317 JvmtiVMObjectAllocEventCollector oam;
3318 vframeStream vfst(thread);
3319
3320 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3321 // This must only be called from SecurityManager.getClassContext
3322 Method* m = vfst.method();
3323 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3324 m->name() == vmSymbols::getClassContext_name() &&
3325 m->signature() == vmSymbols::void_class_array_signature())) {
3326 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3327 }
3328 }
3329
3330 // Collect method holders
3331 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3332 for (; !vfst.at_end(); vfst.security_next()) {
3333 Method* m = vfst.method();
3334 // Native frames are not returned
3335 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3336 Klass* holder = m->method_holder();
3337 assert(holder->is_klass(), "just checking");
3338 klass_array->append(holder);
3339 }
3340 }
3341
3342 // Create result array of type [Ljava/lang/Class;
3343 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3344 // Fill in mirrors corresponding to method holders
3345 for (int i = 0; i < klass_array->length(); i++) {
3346 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3347 }
3348
3349 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3350 JVM_END
3351
3352
3353 // java.lang.Package ////////////////////////////////////////////////////////////////
3354
3355
3356 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3357 ResourceMark rm(THREAD);
3358 JvmtiVMObjectAllocEventCollector oam;
3359 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3360 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3361 return (jstring) JNIHandles::make_local(THREAD, result);
3362 JVM_END
3363
3364
3365 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3366 JvmtiVMObjectAllocEventCollector oam;
3367 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3368 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3369 JVM_END
3370
3371
3372 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3373
3374
3375 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3376 MonitorLocker ml(Heap_lock);
3377 oop ref = Universe::reference_pending_list();
3378 if (ref != nullptr) {
3379 Universe::clear_reference_pending_list();
3380 }
3381 return JNIHandles::make_local(THREAD, ref);
3382 JVM_END
3383
3384 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3385 MonitorLocker ml(Heap_lock);
3386 return Universe::has_reference_pending_list();
3387 JVM_END
3388
3389 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3390 MonitorLocker ml(Heap_lock);
3391 while (!Universe::has_reference_pending_list()) {
3392 ml.wait();
3393 }
3394 JVM_END
3395
3396 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3397 oop ref_oop = JNIHandles::resolve_non_null(ref);
3398 // PhantomReference has it's own implementation of refersTo().
3399 // See: JVM_PhantomReferenceRefersTo
3400 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3401 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3402 return referent == JNIHandles::resolve(o);
3403 JVM_END
3404
3405 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3406 oop ref_oop = JNIHandles::resolve_non_null(ref);
3407 // FinalReference has it's own implementation of clear().
3408 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3409 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3410 // If the referent has already been cleared then done.
3411 // However, if the referent is dead but has not yet been cleared by
3412 // concurrent reference processing, it should NOT be cleared here.
3413 // Instead, clearing should be left to the GC. Clearing it here could
3414 // detectably lose an expected notification, which is impossible with
3415 // STW reference processing. The clearing in enqueue() doesn't have
3416 // this problem, since the enqueue covers the notification, but it's not
3417 // worth the effort to handle that case specially.
3418 return;
3419 }
3420 java_lang_ref_Reference::clear_referent(ref_oop);
3421 JVM_END
3422
3423
3424 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3425
3426
3427 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3428 oop ref_oop = JNIHandles::resolve_non_null(ref);
3429 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3430 return referent == JNIHandles::resolve(o);
3431 JVM_END
3432
3433
3434 // ObjectInputStream ///////////////////////////////////////////////////////////////
3435
3436 // Return the first user-defined class loader up the execution stack, or null
3437 // if only code from the bootstrap or platform class loader is on the stack.
3438
3439 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3440 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3441 InstanceKlass* ik = vfst.method()->method_holder();
3442 oop loader = ik->class_loader();
3443 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3444 return JNIHandles::make_local(THREAD, loader);
3445 }
3446 }
3447 return nullptr;
3448 JVM_END
3449
3450
3451 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3452
3453
3454 // resolve array handle and check arguments
3455 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3456 if (arr == nullptr) {
3457 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3458 }
3459 oop a = JNIHandles::resolve_non_null(arr);
3460 if (!a->is_array()) {
3461 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3462 } else if (type_array_only && !a->is_typeArray()) {
3463 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3464 }
3465 return arrayOop(a);
3466 }
3467
3468
3469 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3470 arrayOop a = check_array(env, arr, false, CHECK_0);
3471 return a->length();
3472 JVM_END
3473
3474
3475 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3476 JvmtiVMObjectAllocEventCollector oam;
3477 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3478 jvalue value;
3479 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3480 oop box = Reflection::box(&value, type, CHECK_NULL);
3481 return JNIHandles::make_local(THREAD, box);
3482 JVM_END
3483
3484
3485 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3486 jvalue value;
3487 value.i = 0; // to initialize value before getting used in CHECK
3488 arrayOop a = check_array(env, arr, true, CHECK_(value));
3489 assert(a->is_typeArray(), "just checking");
3490 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3491 BasicType wide_type = (BasicType) wCode;
3492 if (type != wide_type) {
3493 Reflection::widen(&value, type, wide_type, CHECK_(value));
3494 }
3495 return value;
3496 JVM_END
3497
3498
3499 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3500 arrayOop a = check_array(env, arr, false, CHECK);
3501 oop box = JNIHandles::resolve(val);
3502 jvalue value;
3503 value.i = 0; // to initialize value before getting used in CHECK
3504 BasicType value_type;
3505 if (a->is_objArray()) {
3506 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3507 value_type = Reflection::unbox_for_regular_object(box, &value);
3508 } else {
3509 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3510 }
3511 Reflection::array_set(&value, a, index, value_type, CHECK);
3512 JVM_END
3513
3514
3515 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3516 arrayOop a = check_array(env, arr, true, CHECK);
3517 assert(a->is_typeArray(), "just checking");
3518 BasicType value_type = (BasicType) vCode;
3519 Reflection::array_set(&v, a, index, value_type, CHECK);
3520 JVM_END
3521
3522
3523 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3524 JvmtiVMObjectAllocEventCollector oam;
3525 oop element_mirror = JNIHandles::resolve(eltClass);
3526 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3527 return JNIHandles::make_local(THREAD, result);
3528 JVM_END
3529
3530
3531 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3532 JvmtiVMObjectAllocEventCollector oam;
3533 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3534 oop element_mirror = JNIHandles::resolve(eltClass);
3535 assert(dim_array->is_typeArray(), "just checking");
3536 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3537 return JNIHandles::make_local(THREAD, result);
3538 JVM_END
3539
3540
3541 // Library support ///////////////////////////////////////////////////////////////////////////
3542
3543 JVM_LEAF(void*, JVM_LoadZipLibrary())
3544 return ZipLibrary::handle();
3545 JVM_END
3546
3547 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3548 //%note jvm_ct
3549 char ebuf[1024];
3550 void *load_result;
3551 {
3552 ThreadToNativeFromVM ttnfvm(thread);
3553 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3554 }
3555 if (load_result == nullptr) {
3556 if (throwException) {
3557 char msg[1024];
3558 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3559 // Since 'ebuf' may contain a string encoded using
3560 // platform encoding scheme, we need to pass
3561 // Exceptions::unsafe_to_utf8 to the new_exception method
3562 // as the last argument. See bug 6367357.
3563 Handle h_exception =
3564 Exceptions::new_exception(thread,
3565 vmSymbols::java_lang_UnsatisfiedLinkError(),
3566 msg, Exceptions::unsafe_to_utf8);
3567
3568 THROW_HANDLE_NULL(h_exception);
3569 } else {
3570 log_info(library)("Failed to load library %s", name);
3571 return load_result;
3572 }
3573 }
3574 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3575 return load_result;
3576 JVM_END
3577
3578
3579 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3580 os::dll_unload(handle);
3581 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3582 JVM_END
3583
3584
3585 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3586 void* find_result = os::dll_lookup(handle, name);
3587 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3588 find_result != nullptr ? "Found" : "Failed to find",
3589 name, p2i(handle));
3590 return find_result;
3591 JVM_END
3592
3593
3594 // JNI version ///////////////////////////////////////////////////////////////////////////////
3595
3596 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3597 return Threads::is_supported_jni_version_including_1_1(version);
3598 JVM_END
3599
3600
3601 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3602 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3603 JVM_END
3604
3605 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3606 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3607 JVM_END
3608
3609 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3610 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3611 JVM_END
3612
3613 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3614 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3615 JVM_END
3616
3617 JVM_ENTRY_NO_ENV(jboolean, JVM_IsStaticallyLinked(void))
3618 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3619 JVM_END
3620
3621 // String support ///////////////////////////////////////////////////////////////////////////
3622
3623 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3624 JvmtiVMObjectAllocEventCollector oam;
3625 if (str == nullptr) return nullptr;
3626 oop string = JNIHandles::resolve_non_null(str);
3627 oop result = StringTable::intern(string, CHECK_NULL);
3628 return (jstring) JNIHandles::make_local(THREAD, result);
3629 JVM_END
3630
3631
3632 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3633
3634 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3635 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3636 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3637 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3638 // nature. JavaThreads will be "in native" when using this API from JDK code.
3639
3640
3641 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3642 VM_Exit::block_if_vm_exited();
3643 return new PlatformMutex();
3644 }
3645
3646
3647 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3648 VM_Exit::block_if_vm_exited();
3649 delete ((PlatformMutex*) mon);
3650 }
3651
3652
3653 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3654 VM_Exit::block_if_vm_exited();
3655 ((PlatformMutex*) mon)->lock();
3656 return 0;
3657 }
3658
3659
3660 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3661 VM_Exit::block_if_vm_exited();
3662 ((PlatformMutex*) mon)->unlock();
3663 }
3664
3665
3666 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3667
3668 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3669 Handle loader, Handle protection_domain,
3670 jboolean throwError, TRAPS) {
3671 // Security Note:
3672 // The Java level wrapper will perform the necessary security check allowing
3673 // us to pass the null as the initiating class loader. The VM is responsible for
3674 // the checkPackageAccess relative to the initiating class loader via the
3675 // protection_domain. The protection_domain is passed as null by the java code
3676 // if there is no security manager in 3-arg Class.forName().
3677 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3678
3679 // Check if we should initialize the class
3680 if (init && klass->is_instance_klass()) {
3681 klass->initialize(CHECK_NULL);
3682 }
3683 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3684 }
3685
3686
3687 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3688
3689 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3690 Handle method_handle;
3691 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3692 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3693 Handle receiver(THREAD, JNIHandles::resolve(obj));
3694 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3695 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3696 jobject res = JNIHandles::make_local(THREAD, result);
3697 if (JvmtiExport::should_post_vm_object_alloc()) {
3698 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3699 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3700 if (java_lang_Class::is_primitive(ret_type)) {
3701 // Only for primitive type vm allocates memory for java object.
3702 // See box() method.
3703 JvmtiExport::post_vm_object_alloc(thread, result);
3704 }
3705 }
3706 return res;
3707 } else {
3708 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3709 }
3710 JVM_END
3711
3712
3713 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3714 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3715 oop constructor_mirror = JNIHandles::resolve(c);
3716 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3717 jobject res = JNIHandles::make_local(THREAD, result);
3718 if (JvmtiExport::should_post_vm_object_alloc()) {
3719 JvmtiExport::post_vm_object_alloc(thread, result);
3720 }
3721 return res;
3722 JVM_END
3723
3724 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3726 assert(k->is_klass(), "just checking");
3727 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3728 JVM_END
3729
3730 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3731 jclass caller,
3732 jstring interfaceMethodName,
3733 jobject factoryType,
3734 jobject interfaceMethodType,
3735 jobject implementationMember,
3736 jobject dynamicMethodType,
3737 jclass lambdaProxyClass))
3738 #if INCLUDE_CDS
3739 if (!CDSConfig::is_dumping_archive()) {
3740 return;
3741 }
3742
3743 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3744 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3745 if (caller_ik->is_hidden()) {
3746 // Hidden classes not of type lambda proxy classes are currently not being archived.
3747 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3748 // registered for archiving.
3749 return;
3750 }
3751 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3752 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3753 assert(lambda_ik->is_hidden(), "must be a hidden class");
3754 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3755
3756 Symbol* interface_method_name = nullptr;
3757 if (interfaceMethodName != nullptr) {
3758 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3759 }
3760 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3761 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3762
3763 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3764 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3765
3766 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3767 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3768 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3769
3770 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3771 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3772
3773 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3774 interface_method_type, m, dynamic_method_type, THREAD);
3775 #endif // INCLUDE_CDS
3776 JVM_END
3777
3778 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3779 jclass caller,
3780 jstring interfaceMethodName,
3781 jobject factoryType,
3782 jobject interfaceMethodType,
3783 jobject implementationMember,
3784 jobject dynamicMethodType))
3785 #if INCLUDE_CDS
3786
3787 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3788 implementationMember == nullptr || dynamicMethodType == nullptr) {
3789 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3790 }
3791
3792 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3793 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3794 if (!caller_ik->is_shared()) {
3795 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3796 return nullptr;
3797 }
3798
3799 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3800 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3801 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3802
3803 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3804 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3805
3806 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3807 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3808 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3809
3810 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3811 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3812
3813 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3814 interface_method_type, m, dynamic_method_type);
3815 jclass jcls = nullptr;
3816 if (lambda_ik != nullptr) {
3817 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3818 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3819 }
3820 return jcls;
3821 #else
3822 return nullptr;
3823 #endif // INCLUDE_CDS
3824 JVM_END
3825
3826 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3827 if (CDSConfig::is_dumping_static_archive()) {
3828 // We do this so that the default CDS archive can be deterministic.
3829 const char* release = VM_Version::vm_release();
3830 const char* dbg_level = VM_Version::jdk_debug_level();
3831 const char* version = VM_Version::internal_vm_info_string();
3832 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3833 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3834 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3835 seed += (jlong)VM_Version::vm_major_version();
3836 seed += (jlong)VM_Version::vm_minor_version();
3837 seed += (jlong)VM_Version::vm_security_version();
3838 seed += (jlong)VM_Version::vm_patch_version();
3839 if (seed == 0) { // don't let this ever be zero.
3840 seed = 0x87654321;
3841 }
3842 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3843 return seed;
3844 } else {
3845 return 0;
3846 }
3847 JVM_END
3848
3849 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3850 return CDSConfig::get_status();
3851 JVM_END
3852
3853 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3854 #if INCLUDE_CDS
3855 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3856 if (line != nullptr) {
3857 ResourceMark rm(THREAD);
3858 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3859 char* c_line = java_lang_String::as_utf8_string(h_line());
3860 if (CDSConfig::is_dumping_dynamic_archive()) {
3861 // Note: LambdaFormInvokers::append take same format which is not
3862 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3863 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3864 }
3865 if (ClassListWriter::is_enabled()) {
3866 ClassListWriter w;
3867 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3868 }
3869 }
3870 #endif // INCLUDE_CDS
3871 JVM_END
3872
3873 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3874 #if INCLUDE_CDS
3875 ResourceMark rm(THREAD);
3876 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3877 char* file_name = java_lang_String::as_utf8_string(file_handle());
3878 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3879 #endif // INCLUDE_CDS
3880 JVM_END
3881
3882 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3883 #if INCLUDE_CDS
3884 ResourceMark rm(THREAD);
3885 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3886 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3887 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3888 #endif // INCLUDE_CDS
3889 JVM_END
3890
3891 // Returns an array of all live Thread objects (VM internal JavaThreads,
3892 // jvmti agent threads, and JNI attaching threads are skipped)
3893 // See CR 6404306 regarding JNI attaching threads
3894 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3895 ResourceMark rm(THREAD);
3896 ThreadsListEnumerator tle(THREAD, false, false);
3897 JvmtiVMObjectAllocEventCollector oam;
3898
3899 int num_threads = tle.num_threads();
3900 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3901 objArrayHandle threads_ah(THREAD, r);
3902
3903 for (int i = 0; i < num_threads; i++) {
3904 Handle h = tle.get_threadObj(i);
3905 threads_ah->obj_at_put(i, h());
3906 }
3907
3908 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3909 JVM_END
3910
3911
3912 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3913 // Return StackTraceElement[][], each element is the stack trace of a thread in
3914 // the corresponding entry in the given threads array
3915 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3916 JvmtiVMObjectAllocEventCollector oam;
3917
3918 // Check if threads is null
3919 if (threads == nullptr) {
3920 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3921 }
3922
3923 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3924 objArrayHandle ah(THREAD, a);
3925 int num_threads = ah->length();
3926 // check if threads is non-empty array
3927 if (num_threads == 0) {
3928 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3929 }
3930
3931 // check if threads is not an array of objects of Thread class
3932 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3933 if (k != vmClasses::Thread_klass()) {
3934 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3935 }
3936
3937 ResourceMark rm(THREAD);
3938
3939 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3940 for (int i = 0; i < num_threads; i++) {
3941 oop thread_obj = ah->obj_at(i);
3942 instanceHandle h(THREAD, (instanceOop) thread_obj);
3943 thread_handle_array->append(h);
3944 }
3945
3946 // The JavaThread references in thread_handle_array are validated
3947 // in VM_ThreadDump::doit().
3948 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3949 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3950
3951 JVM_END
3952
3953 // JVM monitoring and management support
3954 JVM_LEAF(void*, JVM_GetManagement(jint version))
3955 return Management::get_jmm_interface(version);
3956 JVM_END
3957
3958 // com.sun.tools.attach.VirtualMachine agent properties support
3959 //
3960 // Initialize the agent properties with the properties maintained in the VM
3961 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3962 ResourceMark rm;
3963
3964 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3965
3966 PUTPROP(props, "sun.java.command", Arguments::java_command());
3967 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3968 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3969 return properties;
3970 JVM_END
3971
3972 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3973 {
3974 JvmtiVMObjectAllocEventCollector oam;
3975
3976 if (ofClass == nullptr) {
3977 return nullptr;
3978 }
3979 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3980 // Special handling for primitive objects
3981 if (java_lang_Class::is_primitive(mirror())) {
3982 return nullptr;
3983 }
3984 Klass* k = java_lang_Class::as_Klass(mirror());
3985 if (!k->is_instance_klass()) {
3986 return nullptr;
3987 }
3988 InstanceKlass* ik = InstanceKlass::cast(k);
3989 int encl_method_class_idx = ik->enclosing_method_class_index();
3990 if (encl_method_class_idx == 0) {
3991 return nullptr;
3992 }
3993 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3994 objArrayHandle dest(THREAD, dest_o);
3995 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3996 dest->obj_at_put(0, enc_k->java_mirror());
3997 int encl_method_method_idx = ik->enclosing_method_method_index();
3998 if (encl_method_method_idx != 0) {
3999 Symbol* sym = ik->constants()->symbol_at(
4000 extract_low_short_from_int(
4001 ik->constants()->name_and_type_at(encl_method_method_idx)));
4002 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4003 dest->obj_at_put(1, str());
4004 sym = ik->constants()->symbol_at(
4005 extract_high_short_from_int(
4006 ik->constants()->name_and_type_at(encl_method_method_idx)));
4007 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4008 dest->obj_at_put(2, str());
4009 }
4010 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
4011 }
4012 JVM_END
4013
4014 // Returns an array of java.lang.String objects containing the input arguments to the VM.
4015 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
4016 ResourceMark rm(THREAD);
4017
4018 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
4019 return nullptr;
4020 }
4021
4022 char** vm_flags = Arguments::jvm_flags_array();
4023 char** vm_args = Arguments::jvm_args_array();
4024 int num_flags = Arguments::num_jvm_flags();
4025 int num_args = Arguments::num_jvm_args();
4026
4027 InstanceKlass* ik = vmClasses::String_klass();
4028 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
4029 objArrayHandle result_h(THREAD, r);
4030
4031 int index = 0;
4032 for (int j = 0; j < num_flags; j++, index++) {
4033 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
4034 result_h->obj_at_put(index, h());
4035 }
4036 for (int i = 0; i < num_args; i++, index++) {
4037 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
4038 result_h->obj_at_put(index, h());
4039 }
4040 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
4041 JVM_END
4042
4043 JVM_LEAF(jint, JVM_FindSignal(const char *name))
4044 return os::get_signal_number(name);
4045 JVM_END
4046
4047 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
4048 #if INCLUDE_JVMTI
4049 if (!DoJVMTIVirtualThreadTransitions) {
4050 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4051 return;
4052 }
4053 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4054 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
4055 } else {
4056 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4057 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
4058 }
4059 #endif
4060 JVM_END
4061
4062 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
4063 #if INCLUDE_JVMTI
4064 if (!DoJVMTIVirtualThreadTransitions) {
4065 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4066 return;
4067 }
4068 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4069 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
4070 } else {
4071 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4072 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
4073 }
4074 #endif
4075 JVM_END
4076
4077 // If notifications are disabled then just update the VTMS transition bit and return.
4078 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
4079 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
4080 #if INCLUDE_JVMTI
4081 if (!DoJVMTIVirtualThreadTransitions) {
4082 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4083 return;
4084 }
4085 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4086 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
4087 } else {
4088 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4089 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4090 }
4091 #endif
4092 JVM_END
4093
4094 // If notifications are disabled then just update the VTMS transition bit and return.
4095 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
4096 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
4097 #if INCLUDE_JVMTI
4098 if (!DoJVMTIVirtualThreadTransitions) {
4099 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4100 return;
4101 }
4102 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4103 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
4104 } else {
4105 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4106 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4107 }
4108 #endif
4109 JVM_END
4110
4111 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
4112 // Needed to avoid deadlocks with JVMTI suspend mechanism.
4113 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
4114 #if INCLUDE_JVMTI
4115 if (!DoJVMTIVirtualThreadTransitions) {
4116 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4117 return;
4118 }
4119 assert(thread->is_disable_suspend() != (bool)enter,
4120 "nested or unbalanced monitor enter/exit is not allowed");
4121 thread->toggle_is_disable_suspend();
4122 #endif
4123 JVM_END
4124
4125 /*
4126 * Return the current class's class file version. The low order 16 bits of the
4127 * returned jint contain the class's major version. The high order 16 bits
4128 * contain the class's minor version.
4129 */
4130 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4131 oop mirror = JNIHandles::resolve_non_null(current);
4132 if (java_lang_Class::is_primitive(mirror)) {
4133 // return latest major version and minor version of 0.
4134 return JVM_CLASSFILE_MAJOR_VERSION;
4135 }
4136 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4137
4138 Klass* c = java_lang_Class::as_Klass(mirror);
4139 assert(c->is_instance_klass(), "must be");
4140 InstanceKlass* ik = InstanceKlass::cast(c);
4141 return (ik->minor_version() << 16) | ik->major_version();
4142 JVM_END
4143
4144 /*
4145 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4146 * get the value will see a materialized value and not a scalar-replaced
4147 * null value.
4148 */
4149 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4150 JVM_EnsureMaterializedForStackWalk(env, value);
4151 JVM_END
4152
4153 /*
4154 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4155 */
4156 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4157 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4158 JVM_END