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 "cds/aotClassInitializer.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 "cds/lambdaProxyClassDictionary.hpp"
33 #include "classfile/classFileStream.hpp"
34 #include "classfile/classLoader.inline.hpp"
35 #include "classfile/classLoaderData.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/flatArrayKlass.hpp"
62 #include "oops/instanceKlass.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/recordComponent.hpp"
66 #include "oops/objArrayKlass.hpp"
67 #include "oops/objArrayOop.inline.hpp"
68 #include "oops/oop.inline.hpp"
69 #include "prims/foreignGlobals.hpp"
70 #include "prims/jvm_misc.hpp"
71 #include "prims/jvmtiExport.hpp"
72 #include "prims/jvmtiThreadState.inline.hpp"
73 #include "prims/stackwalk.hpp"
74 #include "runtime/arguments.hpp"
75 #include "runtime/atomic.hpp"
76 #include "runtime/continuation.hpp"
77 #include "runtime/globals_extension.hpp"
78 #include "runtime/handles.inline.hpp"
79 #include "runtime/init.hpp"
80 #include "runtime/interfaceSupport.inline.hpp"
81 #include "runtime/deoptimization.hpp"
82 #include "runtime/handshake.hpp"
83 #include "runtime/java.hpp"
84 #include "runtime/javaCalls.hpp"
85 #include "runtime/javaThread.hpp"
86 #include "runtime/jfieldIDWorkaround.hpp"
87 #include "runtime/jniHandles.inline.hpp"
88 #include "runtime/os.inline.hpp"
89 #include "runtime/osThread.hpp"
90 #include "runtime/perfData.hpp"
91 #include "runtime/reflection.hpp"
92 #include "runtime/synchronizer.hpp"
93 #include "runtime/threadIdentifier.hpp"
94 #include "runtime/threadSMR.hpp"
95 #include "runtime/vframe.inline.hpp"
96 #include "runtime/vmOperations.hpp"
97 #include "runtime/vm_version.hpp"
98 #include "services/attachListener.hpp"
99 #include "services/management.hpp"
100 #include "services/threadService.hpp"
101 #include "utilities/checkedCast.hpp"
102 #include "utilities/copy.hpp"
103 #include "utilities/defaultStream.hpp"
104 #include "utilities/dtrace.hpp"
105 #include "utilities/events.hpp"
106 #include "utilities/macros.hpp"
107 #include "utilities/utf8.hpp"
108 #include "utilities/zipLibrary.hpp"
109 #if INCLUDE_CDS
110 #include "classfile/systemDictionaryShared.hpp"
111 #endif
112 #if INCLUDE_JFR
113 #include "jfr/jfr.hpp"
114 #endif
115 #if INCLUDE_MANAGEMENT
116 #include "services/finalizerService.hpp"
117 #endif
118 #ifdef LINUX
119 #include "osContainer_linux.hpp"
120 #endif
121
122 #include <errno.h>
123
124 /*
125 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
126 such ctors and calls MUST NOT come between an oop declaration/init and its
127 usage because if objects are move this may cause various memory stomps, bus
128 errors and segfaults. Here is a cookbook for causing so called "naked oop
129 failures":
130
131 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
132 // Object address to be held directly in mirror & not visible to GC
133 oop mirror = JNIHandles::resolve_non_null(ofClass);
134
135 // If this ctor can hit a safepoint, moving objects around, then
136 ComplexConstructor foo;
137
138 // Boom! mirror may point to JUNK instead of the intended object
139 (some dereference of mirror)
140
141 // Here's another call that may block for GC, making mirror stale
142 MutexLocker ml(some_lock);
143
144 // And here's an initializer that can result in a stale oop
145 // all in one step.
146 oop o = call_that_can_throw_exception(TRAPS);
147
148
149 The solution is to keep the oop declaration BELOW the ctor or function
150 call that might cause a GC, do another resolve to reassign the oop, or
151 consider use of a Handle instead of an oop so there is immunity from object
152 motion. But note that the "QUICK" entries below do not have a handlemark
153 and thus can only support use of handles passed in.
154 */
155
156 extern void trace_class_resolution(Klass* to_class) {
157 ResourceMark rm;
158 int line_number = -1;
159 const char * source_file = nullptr;
160 const char * trace = "explicit";
161 InstanceKlass* caller = nullptr;
162 JavaThread* jthread = JavaThread::current();
163 if (jthread->has_last_Java_frame()) {
164 vframeStream vfst(jthread);
165
166 // Scan up the stack skipping ClassLoader frames.
167 Method* last_caller = nullptr;
168
169 while (!vfst.at_end()) {
170 Method* m = vfst.method();
171 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
172 break;
173 }
174 last_caller = m;
175 vfst.next();
176 }
177 // if this is called from Class.forName0 and that is called from Class.forName,
178 // then print the caller of Class.forName. If this is Class.loadClass, then print
179 // that caller, otherwise keep quiet since this should be picked up elsewhere.
180 bool found_it = false;
181 if (!vfst.at_end() &&
182 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
183 vfst.method()->name() == vmSymbols::forName0_name()) {
184 vfst.next();
185 if (!vfst.at_end() &&
186 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
187 vfst.method()->name() == vmSymbols::forName_name()) {
188 vfst.next();
189 found_it = true;
190 }
191 } else if (last_caller != nullptr &&
192 last_caller->method_holder()->name() ==
193 vmSymbols::java_lang_ClassLoader() &&
194 last_caller->name() == vmSymbols::loadClass_name()) {
195 found_it = true;
196 } else if (!vfst.at_end()) {
197 if (vfst.method()->is_native()) {
198 // JNI call
199 found_it = true;
200 }
201 }
202 if (found_it && !vfst.at_end()) {
203 // found the caller
204 caller = vfst.method()->method_holder();
205 line_number = vfst.method()->line_number_from_bci(vfst.bci());
206 if (line_number == -1) {
207 // show method name if it's a native method
208 trace = vfst.method()->name_and_sig_as_C_string();
209 }
210 Symbol* s = caller->source_file_name();
211 if (s != nullptr) {
212 source_file = s->as_C_string();
213 }
214 }
215 }
216 if (caller != nullptr) {
217 if (to_class != caller) {
218 const char * from = caller->external_name();
219 const char * to = to_class->external_name();
220 // print in a single call to reduce interleaving between threads
221 if (source_file != nullptr) {
222 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
223 } else {
224 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
225 }
226 }
227 }
228 }
229
230 // java.lang.System //////////////////////////////////////////////////////////////////////
231
232
233 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
234 return os::javaTimeMillis();
235 JVM_END
236
237 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
238 return os::javaTimeNanos();
239 JVM_END
240
241 // The function below is actually exposed by jdk.internal.misc.VM and not
242 // java.lang.System, but we choose to keep it here so that it stays next
243 // to JVM_CurrentTimeMillis and JVM_NanoTime
244
245 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
246 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
247
248 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
249 jlong seconds;
250 jlong nanos;
251
252 os::javaTimeSystemUTC(seconds, nanos);
253
254 // We're going to verify that the result can fit in a long.
255 // For that we need the difference in seconds between 'seconds'
256 // and 'offset_secs' to be such that:
257 // |seconds - offset_secs| < (2^63/10^9)
258 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
259 // which makes |seconds - offset_secs| < 2^33
260 // and we will prefer +/- 2^32 as the maximum acceptable diff
261 // as 2^32 has a more natural feel than 2^33...
262 //
263 // So if |seconds - offset_secs| >= 2^32 - we return a special
264 // sentinel value (-1) which the caller should take as an
265 // exception value indicating that the offset given to us is
266 // too far from range of the current time - leading to too big
267 // a nano adjustment. The caller is expected to recover by
268 // computing a more accurate offset and calling this method
269 // again. (For the record 2^32 secs is ~136 years, so that
270 // should rarely happen)
271 //
272 jlong diff = seconds - offset_secs;
273 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
274 return -1; // sentinel value: the offset is too far off the target
275 }
276
277 // return the adjustment. If you compute a time by adding
278 // this number of nanoseconds along with the number of seconds
279 // in the offset you should get the current UTC time.
280 return (diff * (jlong)1000000000) + nanos;
281 JVM_END
282
283 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
284 jobject dst, jint dst_pos, jint length))
285 // Check if we have null pointers
286 if (src == nullptr || dst == nullptr) {
287 THROW(vmSymbols::java_lang_NullPointerException());
288 }
289 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
290 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
291 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
292 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
293 // Do copy
294 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
295 JVM_END
296
297
298 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
299 JavaValue r(T_OBJECT);
300 // public synchronized Object put(Object key, Object value);
301 HandleMark hm(THREAD);
302 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
303 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
304 JavaCalls::call_virtual(&r,
305 props,
306 vmClasses::Properties_klass(),
307 vmSymbols::put_name(),
308 vmSymbols::object_object_object_signature(),
309 key_str,
310 value_str,
311 THREAD);
312 }
313
314
315 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
316
317 /*
318 * Return all of the system properties in a Java String array with alternating
319 * names and values from the jvm SystemProperty.
320 * Which includes some internal and all commandline -D defined properties.
321 */
322 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
323 ResourceMark rm(THREAD);
324 HandleMark hm(THREAD);
325 int ndx = 0;
326 int fixedCount = 2;
327
328 SystemProperty* p = Arguments::system_properties();
329 int count = Arguments::PropertyList_count(p);
330
331 // Allocate result String array
332 InstanceKlass* ik = vmClasses::String_klass();
333 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
334 objArrayHandle result_h(THREAD, r);
335
336 while (p != nullptr) {
337 const char * key = p->key();
338 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
339 const char * value = p->value();
340 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
341 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
342 result_h->obj_at_put(ndx * 2, key_str());
343 result_h->obj_at_put(ndx * 2 + 1, value_str());
344 ndx++;
345 }
346 p = p->next();
347 }
348
349 // Convert the -XX:MaxDirectMemorySize= command line flag
350 // to the sun.nio.MaxDirectMemorySize property.
351 // Do this after setting user properties to prevent people
352 // from setting the value with a -D option, as requested.
353 // Leave empty if not supplied
354 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
355 char as_chars[256];
356 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
357 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
358 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
359 result_h->obj_at_put(ndx * 2, key_str());
360 result_h->obj_at_put(ndx * 2 + 1, value_str());
361 ndx++;
362 }
363
364 // JVM monitoring and management support
365 // Add the sun.management.compiler property for the compiler's name
366 {
367 #undef CSIZE
368 #if defined(_LP64)
369 #define CSIZE "64-Bit "
370 #else
371 #define CSIZE
372 #endif // 64bit
373
374 #if COMPILER1_AND_COMPILER2
375 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
376 #else
377 #if defined(COMPILER1)
378 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
379 #elif defined(COMPILER2)
380 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
381 #elif INCLUDE_JVMCI
382 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
383 #else
384 const char* compiler_name = "";
385 #endif // compilers
386 #endif // COMPILER1_AND_COMPILER2
387
388 if (*compiler_name != '\0' &&
389 (Arguments::mode() != Arguments::_int)) {
390 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
391 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
392 result_h->obj_at_put(ndx * 2, key_str());
393 result_h->obj_at_put(ndx * 2 + 1, value_str());
394 ndx++;
395 }
396 }
397
398 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
399 JVM_END
400
401
402 /*
403 * Return the temporary directory that the VM uses for the attach
404 * and perf data files.
405 *
406 * It is important that this directory is well-known and the
407 * same for all VM instances. It cannot be affected by configuration
408 * variables such as java.io.tmpdir.
409 */
410 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
411 HandleMark hm(THREAD);
412 const char* temp_dir = os::get_temp_directory();
413 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
414 return (jstring) JNIHandles::make_local(THREAD, h());
415 JVM_END
416
417 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
418 if (len < 0) {
419 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
420 }
421 elmClass->initialize(CHECK);
422 if (elmClass->is_identity_class()) {
423 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
424 }
425 if (elmClass->is_abstract()) {
426 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
427 }
428 }
429
430 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
431 oop o = JNIHandles::resolve_non_null(orig);
432 assert(o->is_array(), "Must be");
433 oop array = nullptr;
434 arrayOop org = (arrayOop)o;
435 arrayHandle oh(THREAD, org);
436 ArrayKlass* ak = ArrayKlass::cast(org->klass());
437 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
438 int len = to - from; // length of the new array
439 if (ak->is_null_free_array_klass()) {
440 if (from >= org->length() || to > org->length()) {
441 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
442 }
443 }
444 if (org->is_flatArray()) {
445 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
446 LayoutKind lk = fak->layout_kind();
447 array = oopFactory::new_flatArray(vk, len, lk, CHECK_NULL);
448 arrayHandle ah(THREAD, (arrayOop)array);
449 int end = to < oh()->length() ? to : oh()->length();
450 for (int i = from; i < end; i++) {
451 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
452 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
453 vk->copy_payload_to_addr(src, dst, lk, false);
454 }
455 array = ah();
456 } else {
457 if (org->is_null_free_array()) {
458 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
459 } else {
460 array = oopFactory::new_objArray(vk, len, CHECK_NULL);
461 }
462 int end = to < oh()->length() ? to : oh()->length();
463 for (int i = from; i < end; i++) {
464 if (i < ((objArrayOop)oh())->length()) {
465 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
466 } else {
467 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
468 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
469 }
470 }
471 }
472 return (jarray) JNIHandles::make_local(THREAD, array);
473 JVM_END
474
475 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
476 oop mirror = JNIHandles::resolve_non_null(elmClass);
477 oop init = JNIHandles::resolve(initVal);
478 if (init == nullptr) {
479 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
480 }
481 Handle init_h(THREAD, init);
482 Klass* klass = java_lang_Class::as_Klass(mirror);
483 if (klass != init_h()->klass()) {
484 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
485 }
486 validate_array_arguments(klass, len, CHECK_NULL);
487 InlineKlass* vk = InlineKlass::cast(klass);
488 oop array = nullptr;
489 if (vk->flat_array() && vk->has_non_atomic_layout()) {
490 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL);
491 for (int i = 0; i < len; i++) {
492 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL);
493 }
494 } else {
495 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
496 for (int i = 0; i < len; i++) {
497 ((objArrayOop)array)->obj_at_put(i, init_h());
498 }
499 }
500 return (jarray) JNIHandles::make_local(THREAD, array);
501 JVM_END
502
503 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
504 oop mirror = JNIHandles::resolve_non_null(elmClass);
505 oop init = JNIHandles::resolve(initVal);
506 if (init == nullptr) {
507 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
508 }
509 Handle init_h(THREAD, init);
510 Klass* klass = java_lang_Class::as_Klass(mirror);
511 if (klass != init_h()->klass()) {
512 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
513 }
514 validate_array_arguments(klass, len, CHECK_NULL);
515 InlineKlass* vk = InlineKlass::cast(klass);
516 oop array = nullptr;
517 if (UseArrayFlattening && vk->is_naturally_atomic() && vk->has_non_atomic_layout()) {
518 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL);
519 for (int i = 0; i < len; i++) {
520 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL);
521 }
522 } else if (UseArrayFlattening && vk->has_atomic_layout()) {
523 array = oopFactory::new_flatArray(vk, len, LayoutKind::ATOMIC_FLAT, CHECK_NULL);
524 for (int i = 0; i < len; i++) {
525 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL);
526 }
527 } else {
528 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
529 for (int i = 0; i < len; i++) {
530 // need a type check here
531
532 ((objArrayOop)array)->obj_at_put(i, init_h());
533 }
534 }
535 return (jarray) JNIHandles::make_local(THREAD, array);
536 JVM_END
537
538 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
539 oop mirror = JNIHandles::resolve_non_null(elmClass);
540 Klass* klass = java_lang_Class::as_Klass(mirror);
541 klass->initialize(CHECK_NULL);
542 validate_array_arguments(klass, len, CHECK_NULL);
543 InlineKlass* vk = InlineKlass::cast(klass);
544 oop array = nullptr;
545 if (UseArrayFlattening && vk->has_nullable_atomic_layout()) {
546 array = oopFactory::new_flatArray(vk, len, LayoutKind::NULLABLE_ATOMIC_FLAT, CHECK_NULL);
547 } else {
548 array = oopFactory::new_objArray(vk, len, CHECK_NULL);
549 }
550 return (jarray) JNIHandles::make_local(THREAD, array);
551 JVM_END
552
553 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
554 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
555 return oop->is_flatArray();
556 JVM_END
557
558 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
559 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
560 return oop->is_null_free_array();
561 JVM_END
562
563 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
564 // There are multiple cases where an array can/must support atomic access:
565 // - the array is a reference array
566 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
567 // - the array is flat and its component type is naturally atomic
568 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
569 if (oop->is_objArray()) return true;
570 if (oop->is_flatArray()) {
571 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
572 if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) {
573 return true;
574 }
575 if (fak->element_klass()->is_naturally_atomic()) return true;
576 }
577 return false;
578 JVM_END
579
580 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
581
582 extern volatile jint vm_created;
583
584 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
585 EventShutdown event;
586 if (event.should_commit()) {
587 event.set_reason("Shutdown requested from Java");
588 event.commit();
589 }
590 JVM_END
591
592
593 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
594 before_exit(thread, true);
595 vm_exit(code);
596 JVM_END
597
598
599 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
600 if (!DisableExplicitGC) {
601 EventSystemGC event;
602 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
603 Universe::heap()->collect(GCCause::_java_lang_system_gc);
604 event.commit();
605 }
606 JVM_END
607
608
609 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
610 return Universe::heap()->millis_since_last_whole_heap_examined();
611 JVM_END
612
613
614 static inline jlong convert_size_t_to_jlong(size_t val) {
615 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
616 NOT_LP64 (return (jlong)val;)
617 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
618 }
619
620 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
621 size_t n = Universe::heap()->capacity();
622 return convert_size_t_to_jlong(n);
623 JVM_END
624
625
626 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
627 size_t n = Universe::heap()->unused();
628 return convert_size_t_to_jlong(n);
629 JVM_END
630
631
632 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
633 size_t n = Universe::heap()->max_capacity();
634 return convert_size_t_to_jlong(n);
635 JVM_END
636
637
638 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
639 return os::active_processor_count();
640 JVM_END
641
642 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
643 #ifdef LINUX
644 if (UseContainerSupport) {
645 return JNI_TRUE;
646 }
647 #endif
648 return JNI_FALSE;
649 JVM_END
650
651 JVM_LEAF(jboolean, JVM_IsContainerized(void))
652 #ifdef LINUX
653 if (OSContainer::is_containerized()) {
654 return JNI_TRUE;
655 }
656 #endif
657 return JNI_FALSE;
658 JVM_END
659
660 // java.lang.Throwable //////////////////////////////////////////////////////
661
662 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
663 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
664 java_lang_Throwable::fill_in_stack_trace(exception);
665 JVM_END
666
667 // java.lang.NullPointerException ///////////////////////////////////////////
668
669 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
670 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
671
672 oop exc = JNIHandles::resolve_non_null(throwable);
673
674 Method* method;
675 int bci;
676 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
677 return nullptr;
678 }
679 if (method->is_native()) {
680 return nullptr;
681 }
682
683 stringStream ss;
684 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
685 if (ok) {
686 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
687 return (jstring) JNIHandles::make_local(THREAD, result);
688 } else {
689 return nullptr;
690 }
691 JVM_END
692
693 // java.lang.StackTraceElement //////////////////////////////////////////////
694
695
696 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
697 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
698 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
699 objArrayHandle stack_trace(THREAD, st);
700 // Fill in the allocated stack trace
701 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
702 JVM_END
703
704
705 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
706 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
707 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
708 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
709 JVM_END
710
711
712 // java.lang.StackWalker //////////////////////////////////////////////////////
713 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
714 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
715
716 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
717 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
718 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
719 if (!have_name) {
720 oop name = StringTable::intern(method->name(), CHECK);
721 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
722 }
723 if (!have_type) {
724 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
725 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
726 }
727 JVM_END
728
729 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
730 jint skip_frames, jobject contScope, jobject cont,
731 jint buffer_size, jint start_index, jobjectArray frames))
732 if (!thread->has_last_Java_frame()) {
733 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
734 }
735
736 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
737 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
738 Handle cont_h(THREAD, JNIHandles::resolve(cont));
739 // frames array is a ClassFrameInfo[] array when only getting caller reference,
740 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
741 // be null.
742 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
743 objArrayHandle frames_array_h(THREAD, fa);
744
745 if (frames_array_h->length() < buffer_size) {
746 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
747 }
748
749 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
750 buffer_size, start_index, frames_array_h, CHECK_NULL);
751 return JNIHandles::make_local(THREAD, result);
752 JVM_END
753
754
755 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
756 jint last_batch_count, jint buffer_size, jint start_index,
757 jobjectArray frames))
758 // frames array is a ClassFrameInfo[] array when only getting caller reference,
759 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
760 // be null.
761 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
762 objArrayHandle frames_array_h(THREAD, fa);
763
764 if (frames_array_h->length() < buffer_size) {
765 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
766 }
767
768 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
769 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
770 start_index, frames_array_h, THREAD);
771 JVM_END
772
773 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
774 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
775 objArrayHandle frames_array_h(THREAD, fa);
776 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
777 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
778
779 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
780 JVM_END
781
782 // java.lang.Object ///////////////////////////////////////////////
783
784
785 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
786 // as implemented in the classic virtual machine; return 0 if object is null
787 if (handle == nullptr) {
788 return 0;
789 }
790 oop obj = JNIHandles::resolve_non_null(handle);
791 if (EnableValhalla && obj->klass()->is_inline_klass()) {
792 JavaValue result(T_INT);
793 JavaCallArguments args;
794 Handle ho(THREAD, obj);
795 args.push_oop(ho);
796 methodHandle method(THREAD, Universe::value_object_hash_code_method());
797 JavaCalls::call(&result, method, &args, THREAD);
798 if (HAS_PENDING_EXCEPTION) {
799 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
800 Handle e(THREAD, PENDING_EXCEPTION);
801 CLEAR_PENDING_EXCEPTION;
802 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
803 }
804 }
805 return result.get_jint();
806 } else {
807 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
808 }
809 JVM_END
810
811
812 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
813 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
814 ObjectSynchronizer::wait(obj, ms, CHECK);
815 JVM_END
816
817
818 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
819 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
820 ObjectSynchronizer::notify(obj, CHECK);
821 JVM_END
822
823
824 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
825 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
826 ObjectSynchronizer::notifyall(obj, CHECK);
827 JVM_END
828
829
830 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
831 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
832 Klass* klass = obj->klass();
833 JvmtiVMObjectAllocEventCollector oam;
834
835 #ifdef ASSERT
836 // Just checking that the cloneable flag is set correct
837 if (obj->is_array()) {
838 guarantee(klass->is_cloneable(), "all arrays are cloneable");
839 } else {
840 guarantee(obj->is_instance(), "should be instanceOop");
841 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
842 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
843 }
844 #endif
845
846 // Check if class of obj supports the Cloneable interface.
847 // All arrays are considered to be cloneable (See JLS 20.1.5).
848 // All j.l.r.Reference classes are considered non-cloneable.
849 if (!klass->is_cloneable() ||
850 (klass->is_instance_klass() &&
851 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
852 ResourceMark rm(THREAD);
853 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
854 }
855
856 if (klass->is_inline_klass()) {
857 // Value instances have no identity, so return the current instance instead of allocating a new one
858 // Value classes cannot have finalizers, so the method can return immediately
859 return JNIHandles::make_local(THREAD, obj());
860 }
861
862 // Make shallow object copy
863 const size_t size = obj->size();
864 oop new_obj_oop = nullptr;
865 if (obj->is_array()) {
866 const int length = ((arrayOop)obj())->length();
867 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
868 /* do_zero */ true, CHECK_NULL);
869 } else {
870 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
871 }
872
873 HeapAccess<>::clone(obj(), new_obj_oop, size);
874
875 Handle new_obj(THREAD, new_obj_oop);
876 // Caution: this involves a java upcall, so the clone should be
877 // "gc-robust" by this stage.
878 if (klass->has_finalizer()) {
879 assert(obj->is_instance(), "should be instanceOop");
880 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
881 new_obj = Handle(THREAD, new_obj_oop);
882 }
883
884 return JNIHandles::make_local(THREAD, new_obj());
885 JVM_END
886
887 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
888
889 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
890 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
891 JVM_END
892
893 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
894 return InstanceKlass::is_finalization_enabled();
895 JVM_END
896
897 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
898
899 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
900 CONT_RegisterNativeMethods(env, cls);
901 JVM_END
902
903 // java.io.File ///////////////////////////////////////////////////////////////
904
905 JVM_LEAF(char*, JVM_NativePath(char* path))
906 return os::native_path(path);
907 JVM_END
908
909
910 // Misc. class handling ///////////////////////////////////////////////////////////
911
912
913 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
914 // Getting the class of the caller frame.
915 //
916 // The call stack at this point looks something like this:
917 //
918 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
919 // [1] [ @CallerSensitive API.method ]
920 // [.] [ (skipped intermediate frames) ]
921 // [n] [ caller ]
922 vframeStream vfst(thread);
923 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
924 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
925 Method* m = vfst.method();
926 assert(m != nullptr, "sanity");
927 switch (n) {
928 case 0:
929 // This must only be called from Reflection.getCallerClass
930 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
931 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
932 }
933 // fall-through
934 case 1:
935 // Frame 0 and 1 must be caller sensitive.
936 if (!m->caller_sensitive()) {
937 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
938 }
939 break;
940 default:
941 if (!m->is_ignored_by_security_stack_walk()) {
942 // We have reached the desired frame; return the holder class.
943 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
944 }
945 break;
946 }
947 }
948 return nullptr;
949 JVM_END
950
951
952 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
953 oop mirror = nullptr;
954 BasicType t = name2type(utf);
955 if (t != T_ILLEGAL && !is_reference_type(t)) {
956 mirror = Universe::java_mirror(t);
957 }
958 if (mirror == nullptr) {
959 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
960 } else {
961 return (jclass) JNIHandles::make_local(THREAD, mirror);
962 }
963 JVM_END
964
965
966 // Returns a class loaded by the bootstrap class loader; or null
967 // if not found. ClassNotFoundException is not thrown.
968 // FindClassFromBootLoader is exported to the launcher for windows.
969 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
970 const char* name))
971 // Java libraries should ensure that name is never null or illegal.
972 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
973 // It's impossible to create this class; the name cannot fit
974 // into the constant pool.
975 return nullptr;
976 }
977 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
978
979 TempNewSymbol h_name = SymbolTable::new_symbol(name);
980 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
981 if (k == nullptr) {
982 return nullptr;
983 }
984
985 if (log_is_enabled(Debug, class, resolve)) {
986 trace_class_resolution(k);
987 }
988 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
989 JVM_END
990
991 // Find a class with this name in this loader, using the caller's protection domain.
992 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
993 jboolean init, jobject loader,
994 jclass caller))
995 TempNewSymbol h_name =
996 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
997 CHECK_NULL);
998
999 oop loader_oop = JNIHandles::resolve(loader);
1000 oop from_class = JNIHandles::resolve(caller);
1001 Handle h_loader(THREAD, loader_oop);
1002
1003 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1004 false, THREAD);
1005
1006 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1007 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1008 }
1009 return result;
1010 JVM_END
1011
1012 // Currently only called from the old verifier.
1013 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1014 jboolean init, jclass from))
1015 TempNewSymbol h_name =
1016 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1017 CHECK_NULL);
1018 oop from_class_oop = JNIHandles::resolve(from);
1019 Klass* from_class = (from_class_oop == nullptr)
1020 ? (Klass*)nullptr
1021 : java_lang_Class::as_Klass(from_class_oop);
1022 oop class_loader = nullptr;
1023 if (from_class != nullptr) {
1024 class_loader = from_class->class_loader();
1025 }
1026 Handle h_loader(THREAD, class_loader);
1027 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1028
1029 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1030 // this function is generally only used for class loading during verification.
1031 ResourceMark rm;
1032 oop from_mirror = JNIHandles::resolve_non_null(from);
1033 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
1034 const char * from_name = from_class->external_name();
1035
1036 oop mirror = JNIHandles::resolve_non_null(result);
1037 Klass* to_class = java_lang_Class::as_Klass(mirror);
1038 const char * to = to_class->external_name();
1039 log_debug(class, resolve)("%s %s (verification)", from_name, to);
1040 }
1041
1042 return result;
1043 JVM_END
1044
1045 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1046 static jclass jvm_define_class_common(const char *name,
1047 jobject loader, const jbyte *buf,
1048 jsize len, jobject pd, const char *source,
1049 TRAPS) {
1050 if (source == nullptr) source = "__JVM_DefineClass__";
1051
1052 JavaThread* jt = THREAD;
1053
1054 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1055 ClassLoader::perf_define_appclass_selftime(),
1056 ClassLoader::perf_define_appclasses(),
1057 jt->get_thread_stat()->perf_recursion_counts_addr(),
1058 jt->get_thread_stat()->perf_timers_addr(),
1059 PerfClassTraceTime::DEFINE_CLASS);
1060
1061 if (UsePerfData) {
1062 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1063 }
1064
1065 // Class resolution will get the class name from the .class stream if the name is null.
1066 TempNewSymbol class_name = name == nullptr ? nullptr :
1067 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1068 CHECK_NULL);
1069
1070 ResourceMark rm(THREAD);
1071 ClassFileStream st((u1*)buf, len, source);
1072 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1073 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1074 ClassLoadInfo cl_info(protection_domain);
1075 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1076 class_loader,
1077 cl_info,
1078 CHECK_NULL);
1079
1080 if (log_is_enabled(Debug, class, resolve)) {
1081 trace_class_resolution(k);
1082 }
1083
1084 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1085 }
1086
1087 enum {
1088 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1089 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1090 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1091 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1092 };
1093
1094 /*
1095 * Define a class with the specified flags that indicates if it's a nestmate,
1096 * hidden, or strongly referenced from class loader.
1097 */
1098 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1099 const jbyte *buf, jsize len, jobject pd,
1100 jboolean init, int flags, jobject classData, TRAPS) {
1101 ResourceMark rm(THREAD);
1102
1103 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
1104 // Lookup class must be a non-null instance
1105 if (lookup_k == nullptr) {
1106 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1107 }
1108 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
1109
1110 Handle class_loader (THREAD, lookup_k->class_loader());
1111
1112 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1113 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1114 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1115 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1116
1117 InstanceKlass* host_class = nullptr;
1118 if (is_nestmate) {
1119 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1120 }
1121
1122 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1123 name,
1124 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1125 is_nestmate ? host_class->external_name() : "",
1126 is_hidden ? "hidden" : "not hidden",
1127 is_strong ? "strong" : "weak",
1128 vm_annotations ? "with vm annotations" : "without vm annotation");
1129
1130 if (!is_hidden) {
1131 // classData is only applicable for hidden classes
1132 if (classData != nullptr) {
1133 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1134 }
1135 if (is_nestmate) {
1136 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1137 }
1138 if (!is_strong) {
1139 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1140 }
1141 if (vm_annotations) {
1142 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1143 }
1144 if (flags != STRONG_LOADER_LINK) {
1145 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1146 err_msg("invalid flag 0x%x", flags));
1147 }
1148 }
1149
1150 // Class resolution will get the class name from the .class stream if the name is null.
1151 TempNewSymbol class_name = name == nullptr ? nullptr :
1152 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1153 CHECK_NULL);
1154
1155 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1156 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1157 ClassFileStream st((u1*)buf, len, source);
1158
1159 InstanceKlass* ik = nullptr;
1160 if (!is_hidden) {
1161 ClassLoadInfo cl_info(protection_domain);
1162 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1163 class_loader,
1164 cl_info,
1165 CHECK_NULL);
1166
1167 if (log_is_enabled(Debug, class, resolve)) {
1168 trace_class_resolution(ik);
1169 }
1170 } else { // hidden
1171 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1172 ClassLoadInfo cl_info(protection_domain,
1173 host_class,
1174 classData_h,
1175 is_hidden,
1176 is_strong,
1177 vm_annotations);
1178 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1179 class_loader,
1180 cl_info,
1181 CHECK_NULL);
1182
1183 // The hidden class loader data has been artificially been kept alive to
1184 // this point. The mirror and any instances of this class have to keep
1185 // it alive afterwards.
1186 ik->class_loader_data()->dec_keep_alive_ref_count();
1187
1188 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1189 ModuleEntry* module = ik->module();
1190 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1191 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1192 module_name,
1193 ik->external_name(),
1194 host_class->external_name(),
1195 ik->is_hidden() ? "is hidden" : "is not hidden");
1196 }
1197 }
1198
1199 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1200 // non-hidden class or nestmate class must be in the same package as the Lookup class
1201 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1202 }
1203
1204 if (init) {
1205 ik->initialize(CHECK_NULL);
1206 } else {
1207 ik->link_class(CHECK_NULL);
1208 }
1209
1210 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1211 }
1212
1213 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1214 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1215 JVM_END
1216
1217 /*
1218 * Define a class with the specified lookup class.
1219 * lookup: Lookup class
1220 * name: the name of the class
1221 * buf: class bytes
1222 * len: length of class bytes
1223 * pd: protection domain
1224 * init: initialize the class
1225 * flags: properties of the class
1226 * classData: private static pre-initialized field
1227 */
1228 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1229 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1230
1231 if (lookup == nullptr) {
1232 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1233 }
1234
1235 assert(buf != nullptr, "buf must not be null");
1236
1237 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1238 JVM_END
1239
1240 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1241
1242 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1243 JVM_END
1244
1245 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1246 ResourceMark rm(THREAD);
1247
1248 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1249 char* str = java_lang_String::as_utf8_string(h_name());
1250
1251 // Sanity check, don't expect null
1252 if (str == nullptr) return nullptr;
1253
1254 // Internalize the string, converting '.' to '/' in string.
1255 char* p = (char*)str;
1256 while (*p != '\0') {
1257 if (*p == '.') {
1258 *p = '/';
1259 }
1260 p++;
1261 }
1262
1263 const int str_len = (int)(p - str);
1264 if (str_len > Symbol::max_length()) {
1265 // It's impossible to create this class; the name cannot fit
1266 // into the constant pool.
1267 return nullptr;
1268 }
1269 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1270
1271 // Security Note:
1272 // The Java level wrapper will perform the necessary security check allowing
1273 // us to pass the null as the initiating class loader.
1274 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1275 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1276 #if INCLUDE_CDS
1277 if (k == nullptr) {
1278 // If the class is not already loaded, try to see if it's in the shared
1279 // archive for the current classloader (h_loader).
1280 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1281 }
1282 #endif
1283 return (k == nullptr) ? nullptr :
1284 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1285 JVM_END
1286
1287 // Module support //////////////////////////////////////////////////////////////////////////////
1288
1289 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1290 jstring location, jobjectArray packages))
1291 Handle h_module (THREAD, JNIHandles::resolve(module));
1292 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1293 JVM_END
1294
1295 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1296 Handle h_module (THREAD, JNIHandles::resolve(module));
1297 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1298 JVM_END
1299
1300 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1301 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1302 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1303 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1304 JVM_END
1305
1306 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1307 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1308 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1309 JVM_END
1310
1311 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1312 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1313 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1314 JVM_END
1315
1316 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1317 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1318 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1319 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1320 JVM_END
1321
1322 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1323 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1324 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1325 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1326 JVM_END
1327
1328 // Reflection support //////////////////////////////////////////////////////////////////////////////
1329
1330 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1331 assert (cls != nullptr, "illegal class");
1332 JvmtiVMObjectAllocEventCollector oam;
1333 ResourceMark rm(THREAD);
1334 HandleMark hm(THREAD);
1335 Handle java_class(THREAD, JNIHandles::resolve(cls));
1336 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1337 return (jstring) JNIHandles::make_local(THREAD, result);
1338 JVM_END
1339
1340
1341 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1342 JvmtiVMObjectAllocEventCollector oam;
1343 oop mirror = JNIHandles::resolve_non_null(cls);
1344
1345 // Special handling for primitive objects
1346 if (java_lang_Class::is_primitive(mirror)) {
1347 // Primitive objects does not have any interfaces
1348 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1349 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1350 }
1351
1352 Klass* klass = java_lang_Class::as_Klass(mirror);
1353 // Figure size of result array
1354 int size;
1355 if (klass->is_instance_klass()) {
1356 InstanceKlass* ik = InstanceKlass::cast(klass);
1357 size = ik->local_interfaces()->length();
1358 } else {
1359 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1360 size = 2;
1361 }
1362
1363 // Allocate result array
1364 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1365 objArrayHandle result (THREAD, r);
1366 // Fill in result
1367 if (klass->is_instance_klass()) {
1368 // Regular instance klass, fill in all local interfaces
1369 for (int index = 0; index < size; index++) {
1370 InstanceKlass* ik = InstanceKlass::cast(klass);
1371 Klass* k = ik->local_interfaces()->at(index);
1372 result->obj_at_put(index, k->java_mirror());
1373 }
1374 } else {
1375 // All arrays implement java.lang.Cloneable and java.io.Serializable
1376 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1377 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1378 }
1379 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1380 JVM_END
1381
1382
1383 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1384 oop mirror = JNIHandles::resolve_non_null(cls);
1385 if (java_lang_Class::is_primitive(mirror)) {
1386 return JNI_FALSE;
1387 }
1388 Klass* k = java_lang_Class::as_Klass(mirror);
1389 return k->is_hidden();
1390 JVM_END
1391
1392 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls))
1393 oop mirror = JNIHandles::resolve_non_null(cls);
1394 if (java_lang_Class::is_primitive(mirror)) {
1395 return JNI_FALSE;
1396 }
1397 Klass* k = java_lang_Class::as_Klass(mirror);
1398 if (EnableValhalla) {
1399 return k->is_array_klass() || k->is_identity_class();
1400 } else {
1401 return k->is_interface() ? JNI_FALSE : JNI_TRUE;
1402 }
1403 JVM_END
1404
1405 class ScopedValueBindingsResolver {
1406 public:
1407 InstanceKlass* Carrier_klass;
1408 ScopedValueBindingsResolver(JavaThread* THREAD) {
1409 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1410 Carrier_klass = InstanceKlass::cast(k);
1411 }
1412 };
1413
1414 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1415 ResourceMark rm(THREAD);
1416 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1417 JvmtiVMObjectAllocEventCollector oam;
1418
1419 static ScopedValueBindingsResolver resolver(THREAD);
1420
1421 // Iterate through Java frames
1422 vframeStream vfst(thread);
1423 for(; !vfst.at_end(); vfst.next()) {
1424 int loc = -1;
1425 // get method of frame
1426 Method* method = vfst.method();
1427
1428 Symbol *name = method->name();
1429
1430 InstanceKlass* holder = method->method_holder();
1431 if (name == vmSymbols::runWith_method_name()) {
1432 if (holder == vmClasses::Thread_klass()
1433 || holder == resolver.Carrier_klass) {
1434 loc = 1;
1435 }
1436 }
1437
1438 if (loc != -1) {
1439 javaVFrame *frame = vfst.asJavaVFrame();
1440 StackValueCollection* locals = frame->locals();
1441 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1442 Handle result = head_sv->get_obj();
1443 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1444 if (result() != nullptr) {
1445 return JNIHandles::make_local(THREAD, result());
1446 }
1447 }
1448 }
1449
1450 return nullptr;
1451 JVM_END
1452
1453 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1454 JvmtiVMObjectAllocEventCollector oam;
1455 // ofClass is a reference to a java_lang_Class object. The mirror object
1456 // of an InstanceKlass
1457 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1458 if (java_lang_Class::is_primitive(ofMirror) ||
1459 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1460 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1461 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1462 }
1463
1464 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1465 InnerClassesIterator iter(k);
1466
1467 if (iter.length() == 0) {
1468 // Neither an inner nor outer class
1469 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1470 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1471 }
1472
1473 // find inner class info
1474 constantPoolHandle cp(thread, k->constants());
1475 int length = iter.length();
1476
1477 // Allocate temp. result array
1478 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1479 objArrayHandle result (THREAD, r);
1480 int members = 0;
1481
1482 for (; !iter.done(); iter.next()) {
1483 int ioff = iter.inner_class_info_index();
1484 int ooff = iter.outer_class_info_index();
1485
1486 if (ioff != 0 && ooff != 0) {
1487 // Check to see if the name matches the class we're looking for
1488 // before attempting to find the class.
1489 if (cp->klass_name_at_matches(k, ooff)) {
1490 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1491 if (outer_klass == k) {
1492 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1493 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1494
1495 // Throws an exception if outer klass has not declared k as
1496 // an inner klass
1497 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1498
1499 result->obj_at_put(members, inner_klass->java_mirror());
1500 members++;
1501 }
1502 }
1503 }
1504 }
1505
1506 if (members != length) {
1507 // Return array of right length
1508 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1509 for(int i = 0; i < members; i++) {
1510 res->obj_at_put(i, result->obj_at(i));
1511 }
1512 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1513 }
1514
1515 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1516 JVM_END
1517
1518
1519 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1520 {
1521 // ofClass is a reference to a java_lang_Class object.
1522 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1523 if (java_lang_Class::is_primitive(ofMirror)) {
1524 return nullptr;
1525 }
1526 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1527 if (!klass->is_instance_klass()) {
1528 return nullptr;
1529 }
1530
1531 bool inner_is_member = false;
1532 Klass* outer_klass
1533 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1534 if (outer_klass == nullptr) return nullptr; // already a top-level class
1535 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1536 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1537 }
1538 JVM_END
1539
1540 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1541 {
1542 oop mirror = JNIHandles::resolve_non_null(cls);
1543 if (java_lang_Class::is_primitive(mirror)) {
1544 return nullptr;
1545 }
1546 Klass* klass = java_lang_Class::as_Klass(mirror);
1547 if (!klass->is_instance_klass()) {
1548 return nullptr;
1549 }
1550 InstanceKlass* k = InstanceKlass::cast(klass);
1551 int ooff = 0, noff = 0;
1552 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1553 if (noff != 0) {
1554 constantPoolHandle i_cp(thread, k->constants());
1555 Symbol* name = i_cp->symbol_at(noff);
1556 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1557 return (jstring) JNIHandles::make_local(THREAD, str());
1558 }
1559 }
1560 return nullptr;
1561 }
1562 JVM_END
1563
1564 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1565 assert (cls != nullptr, "illegal class");
1566 JvmtiVMObjectAllocEventCollector oam;
1567 ResourceMark rm(THREAD);
1568 oop mirror = JNIHandles::resolve_non_null(cls);
1569 // Return null for arrays and primitives
1570 if (!java_lang_Class::is_primitive(mirror)) {
1571 Klass* k = java_lang_Class::as_Klass(mirror);
1572 if (k->is_instance_klass()) {
1573 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1574 if (sym == nullptr) return nullptr;
1575 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1576 return (jstring) JNIHandles::make_local(THREAD, str());
1577 }
1578 }
1579 return nullptr;
1580 JVM_END
1581
1582
1583 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1584 assert (cls != nullptr, "illegal class");
1585 oop mirror = JNIHandles::resolve_non_null(cls);
1586 // Return null for arrays and primitives
1587 if (!java_lang_Class::is_primitive(mirror)) {
1588 Klass* k = java_lang_Class::as_Klass(mirror);
1589 if (k->is_instance_klass()) {
1590 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1591 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1592 }
1593 }
1594 return nullptr;
1595 JVM_END
1596
1597
1598 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1599 // some of this code was adapted from from jni_FromReflectedField
1600
1601 oop reflected = JNIHandles::resolve_non_null(field);
1602 oop mirror = java_lang_reflect_Field::clazz(reflected);
1603 Klass* k = java_lang_Class::as_Klass(mirror);
1604 int slot = java_lang_reflect_Field::slot(reflected);
1605 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1606
1607 InstanceKlass* ik = InstanceKlass::cast(k);
1608 int offset = ik->field_offset(slot);
1609
1610 if (modifiers & JVM_ACC_STATIC) {
1611 // for static fields we only look in the current class
1612 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1613 assert(false, "cannot find static field");
1614 return false;
1615 }
1616 } else {
1617 // for instance fields we start with the current class and work
1618 // our way up through the superclass chain
1619 if (!ik->find_field_from_offset(offset, false, &fd)) {
1620 assert(false, "cannot find instance field");
1621 return false;
1622 }
1623 }
1624 return true;
1625 }
1626
1627 static Method* jvm_get_method_common(jobject method) {
1628 // some of this code was adapted from from jni_FromReflectedMethod
1629
1630 oop reflected = JNIHandles::resolve_non_null(method);
1631 oop mirror = nullptr;
1632 int slot = 0;
1633
1634 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1635 mirror = java_lang_reflect_Constructor::clazz(reflected);
1636 slot = java_lang_reflect_Constructor::slot(reflected);
1637 } else {
1638 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1639 "wrong type");
1640 mirror = java_lang_reflect_Method::clazz(reflected);
1641 slot = java_lang_reflect_Method::slot(reflected);
1642 }
1643 Klass* k = java_lang_Class::as_Klass(mirror);
1644
1645 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1646 assert(m != nullptr, "cannot find method");
1647 return m; // caller has to deal with null in product mode
1648 }
1649
1650 /* Type use annotations support (JDK 1.8) */
1651
1652 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1653 assert (cls != nullptr, "illegal class");
1654 ResourceMark rm(THREAD);
1655 // Return null for arrays and primitives
1656 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1657 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1658 if (k->is_instance_klass()) {
1659 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1660 if (type_annotations != nullptr) {
1661 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1662 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1663 }
1664 }
1665 }
1666 return nullptr;
1667 JVM_END
1668
1669 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1670 assert (method != nullptr, "illegal method");
1671 // method is a handle to a java.lang.reflect.Method object
1672 Method* m = jvm_get_method_common(method);
1673 if (m == nullptr) {
1674 return nullptr;
1675 }
1676
1677 AnnotationArray* type_annotations = m->type_annotations();
1678 if (type_annotations != nullptr) {
1679 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1680 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1681 }
1682
1683 return nullptr;
1684 JVM_END
1685
1686 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1687 assert (field != nullptr, "illegal field");
1688 fieldDescriptor fd;
1689 bool gotFd = jvm_get_field_common(field, fd);
1690 if (!gotFd) {
1691 return nullptr;
1692 }
1693
1694 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1695 JVM_END
1696
1697 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1698 if (!cp->is_within_bounds(index)) {
1699 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1700 }
1701 }
1702
1703 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1704 {
1705 // method is a handle to a java.lang.reflect.Method object
1706 Method* method_ptr = jvm_get_method_common(method);
1707 methodHandle mh (THREAD, method_ptr);
1708 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1709 const int num_params = mh->method_parameters_length();
1710
1711 if (num_params < 0) {
1712 // A -1 return value from method_parameters_length means there is no
1713 // parameter data. Return null to indicate this to the reflection
1714 // API.
1715 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1716 return (jobjectArray)nullptr;
1717 } else {
1718 // Otherwise, we return something up to reflection, even if it is
1719 // a zero-length array. Why? Because in some cases this can
1720 // trigger a MalformedParametersException.
1721
1722 // make sure all the symbols are properly formatted
1723 for (int i = 0; i < num_params; i++) {
1724 MethodParametersElement* params = mh->method_parameters_start();
1725 int index = params[i].name_cp_index;
1726 constantPoolHandle cp(THREAD, mh->constants());
1727 bounds_check(cp, index, CHECK_NULL);
1728
1729 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1730 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1731 "Wrong type at constant pool index");
1732 }
1733
1734 }
1735
1736 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1737 objArrayHandle result (THREAD, result_oop);
1738
1739 for (int i = 0; i < num_params; i++) {
1740 MethodParametersElement* params = mh->method_parameters_start();
1741 // For a 0 index, give a null symbol
1742 Symbol* sym = 0 != params[i].name_cp_index ?
1743 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1744 int flags = params[i].flags;
1745 oop param = Reflection::new_parameter(reflected_method, i, sym,
1746 flags, CHECK_NULL);
1747 result->obj_at_put(i, param);
1748 }
1749 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1750 }
1751 }
1752 JVM_END
1753
1754 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1755
1756 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1757 {
1758 JvmtiVMObjectAllocEventCollector oam;
1759
1760 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1761 // Exclude primitive types and array types
1762 if (java_lang_Class::is_primitive(ofMirror) ||
1763 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1764 // Return empty array
1765 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1766 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1767 }
1768
1769 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1770 constantPoolHandle cp(THREAD, k->constants());
1771
1772 // Ensure class is linked
1773 k->link_class(CHECK_NULL);
1774
1775 // Allocate result
1776 int num_fields;
1777
1778 if (publicOnly) {
1779 num_fields = 0;
1780 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1781 if (fs.access_flags().is_public()) ++num_fields;
1782 }
1783 } else {
1784 num_fields = k->java_fields_count();
1785 }
1786
1787 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1788 objArrayHandle result (THREAD, r);
1789
1790 int out_idx = 0;
1791 fieldDescriptor fd;
1792 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1793 if (!publicOnly || fs.access_flags().is_public()) {
1794 fd.reinitialize(k, fs.index());
1795 oop field = Reflection::new_field(&fd, CHECK_NULL);
1796 result->obj_at_put(out_idx, field);
1797 ++out_idx;
1798 }
1799 }
1800 assert(out_idx == num_fields, "just checking");
1801 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1802 }
1803 JVM_END
1804
1805 // A class is a record if and only if it is final and a direct subclass of
1806 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1807 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1808 {
1809 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1810 if (k != nullptr && k->is_instance_klass()) {
1811 InstanceKlass* ik = InstanceKlass::cast(k);
1812 return ik->is_record();
1813 } else {
1814 return false;
1815 }
1816 }
1817 JVM_END
1818
1819 // Returns an array containing the components of the Record attribute,
1820 // or null if the attribute is not present.
1821 //
1822 // Note that this function returns the components of the Record attribute
1823 // even if the class is not a record.
1824 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1825 {
1826 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1827 assert(c->is_instance_klass(), "must be");
1828 InstanceKlass* ik = InstanceKlass::cast(c);
1829
1830 Array<RecordComponent*>* components = ik->record_components();
1831 if (components != nullptr) {
1832 JvmtiVMObjectAllocEventCollector oam;
1833 constantPoolHandle cp(THREAD, ik->constants());
1834 int length = components->length();
1835 assert(length >= 0, "unexpected record_components length");
1836 objArrayOop record_components =
1837 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1838 objArrayHandle components_h (THREAD, record_components);
1839
1840 for (int x = 0; x < length; x++) {
1841 RecordComponent* component = components->at(x);
1842 assert(component != nullptr, "unexpected null record component");
1843 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1844 components_h->obj_at_put(x, component_oop);
1845 }
1846 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1847 }
1848
1849 return nullptr;
1850 }
1851 JVM_END
1852
1853 static jobjectArray get_class_declared_methods_helper(
1854 JNIEnv *env,
1855 jclass ofClass, jboolean publicOnly,
1856 bool want_constructor,
1857 Klass* klass, TRAPS) {
1858
1859 JvmtiVMObjectAllocEventCollector oam;
1860
1861 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1862 // Exclude primitive types and array types
1863 if (java_lang_Class::is_primitive(ofMirror)
1864 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1865 // Return empty array
1866 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1867 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1868 }
1869
1870 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1871
1872 // Ensure class is linked
1873 k->link_class(CHECK_NULL);
1874
1875 Array<Method*>* methods = k->methods();
1876 int methods_length = methods->length();
1877
1878 // Save original method_idnum in case of redefinition, which can change
1879 // the idnum of obsolete methods. The new method will have the same idnum
1880 // but if we refresh the methods array, the counts will be wrong.
1881 ResourceMark rm(THREAD);
1882 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1883 int num_methods = 0;
1884
1885 // Select methods matching the criteria.
1886 for (int i = 0; i < methods_length; i++) {
1887 Method* method = methods->at(i);
1888 if (want_constructor && !method->is_object_constructor()) {
1889 continue;
1890 }
1891 if (!want_constructor &&
1892 (method->is_object_constructor() || method->is_class_initializer() ||
1893 method->is_overpass())) {
1894 continue;
1895 }
1896 if (publicOnly && !method->is_public()) {
1897 continue;
1898 }
1899 idnums->push(method->method_idnum());
1900 ++num_methods;
1901 }
1902
1903 // Allocate result
1904 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1905 objArrayHandle result (THREAD, r);
1906
1907 // Now just put the methods that we selected above, but go by their idnum
1908 // in case of redefinition. The methods can be redefined at any safepoint,
1909 // so above when allocating the oop array and below when creating reflect
1910 // objects.
1911 for (int i = 0; i < num_methods; i++) {
1912 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1913 if (method.is_null()) {
1914 // Method may have been deleted and seems this API can handle null
1915 // Otherwise should probably put a method that throws NSME
1916 result->obj_at_put(i, nullptr);
1917 } else {
1918 oop m;
1919 if (want_constructor) {
1920 assert(method->is_object_constructor(), "must be");
1921 m = Reflection::new_constructor(method, CHECK_NULL);
1922 } else {
1923 m = Reflection::new_method(method, false, CHECK_NULL);
1924 }
1925 result->obj_at_put(i, m);
1926 }
1927 }
1928
1929 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1930 }
1931
1932 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1933 {
1934 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1935 /*want_constructor*/ false,
1936 vmClasses::reflect_Method_klass(), THREAD);
1937 }
1938 JVM_END
1939
1940 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1941 {
1942 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1943 /*want_constructor*/ true,
1944 vmClasses::reflect_Constructor_klass(), THREAD);
1945 }
1946 JVM_END
1947
1948 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1949 {
1950 oop mirror = JNIHandles::resolve_non_null(cls);
1951 if (java_lang_Class::is_primitive(mirror)) {
1952 // Primitive type
1953 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1954 }
1955
1956 Klass* k = java_lang_Class::as_Klass(mirror);
1957 return k->access_flags().as_class_flags();
1958 }
1959 JVM_END
1960
1961 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1962 {
1963 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1964 assert(c->is_instance_klass(), "must be");
1965 InstanceKlass* ck = InstanceKlass::cast(c);
1966 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1967 assert(m->is_instance_klass(), "must be");
1968 InstanceKlass* mk = InstanceKlass::cast(m);
1969 return ck->has_nestmate_access_to(mk, THREAD);
1970 }
1971 JVM_END
1972
1973 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1974 {
1975 // current is not a primitive or array class
1976 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1977 assert(c->is_instance_klass(), "must be");
1978 InstanceKlass* ck = InstanceKlass::cast(c);
1979 InstanceKlass* host = ck->nest_host(THREAD);
1980 return (jclass) (host == nullptr ? nullptr :
1981 JNIHandles::make_local(THREAD, host->java_mirror()));
1982 }
1983 JVM_END
1984
1985 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1986 {
1987 // current is not a primitive or array class
1988 ResourceMark rm(THREAD);
1989 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1990 assert(c->is_instance_klass(), "must be");
1991 InstanceKlass* ck = InstanceKlass::cast(c);
1992 InstanceKlass* host = ck->nest_host(THREAD);
1993
1994 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1995 ck->external_name(), host->external_name());
1996 {
1997 JvmtiVMObjectAllocEventCollector oam;
1998 Array<u2>* members = host->nest_members();
1999 int length = members == nullptr ? 0 : members->length();
2000
2001 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2002
2003 // nest host is first in the array so make it one bigger
2004 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2005 length + 1, CHECK_NULL);
2006 objArrayHandle result(THREAD, r);
2007 result->obj_at_put(0, host->java_mirror());
2008 if (length != 0) {
2009 int count = 0;
2010 for (int i = 0; i < length; i++) {
2011 int cp_index = members->at(i);
2012 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2013 if (HAS_PENDING_EXCEPTION) {
2014 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2015 return nullptr; // propagate VMEs
2016 }
2017 if (log_is_enabled(Trace, class, nestmates)) {
2018 stringStream ss;
2019 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2020 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2021 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2022 log_trace(class, nestmates)("%s", ss.as_string());
2023 }
2024 CLEAR_PENDING_EXCEPTION;
2025 continue;
2026 }
2027 if (k->is_instance_klass()) {
2028 InstanceKlass* ik = InstanceKlass::cast(k);
2029 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2030 if (nest_host_k == host) {
2031 result->obj_at_put(count+1, k->java_mirror());
2032 count++;
2033 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2034 } else {
2035 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2036 ik->external_name(), nest_host_k->external_name());
2037 }
2038 } else {
2039 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2040 k->external_name());
2041 }
2042 }
2043 if (count < length) {
2044 // we had invalid entries so we need to compact the array
2045 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2046 length + 1, count + 1);
2047
2048 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2049 count + 1, CHECK_NULL);
2050 objArrayHandle result2(THREAD, r2);
2051 for (int i = 0; i < count + 1; i++) {
2052 result2->obj_at_put(i, result->obj_at(i));
2053 }
2054 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2055 }
2056 }
2057 else {
2058 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2059 }
2060 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2061 }
2062 }
2063 JVM_END
2064
2065 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2066 {
2067 oop mirror = JNIHandles::resolve_non_null(current);
2068 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2069 Klass* c = java_lang_Class::as_Klass(mirror);
2070 assert(c->is_instance_klass(), "must be");
2071 InstanceKlass* ik = InstanceKlass::cast(c);
2072 ResourceMark rm(THREAD);
2073 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2074 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2075 if (ik->is_sealed()) {
2076 JvmtiVMObjectAllocEventCollector oam;
2077 Array<u2>* subclasses = ik->permitted_subclasses();
2078 int length = subclasses->length();
2079
2080 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2081
2082 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2083 length, CHECK_NULL);
2084 objArrayHandle result(THREAD, r);
2085 int count = 0;
2086 for (int i = 0; i < length; i++) {
2087 int cp_index = subclasses->at(i);
2088 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2089 if (HAS_PENDING_EXCEPTION) {
2090 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2091 return nullptr; // propagate VMEs
2092 }
2093 if (log_is_enabled(Trace, class, sealed)) {
2094 stringStream ss;
2095 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2096 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2097 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2098 log_trace(class, sealed)("%s", ss.as_string());
2099 }
2100
2101 CLEAR_PENDING_EXCEPTION;
2102 continue;
2103 }
2104 if (k->is_instance_klass()) {
2105 result->obj_at_put(count++, k->java_mirror());
2106 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2107 }
2108 }
2109 if (count < length) {
2110 // we had invalid entries so we need to compact the array
2111 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2112 count, CHECK_NULL);
2113 objArrayHandle result2(THREAD, r2);
2114 for (int i = 0; i < count; i++) {
2115 result2->obj_at_put(i, result->obj_at(i));
2116 }
2117 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2118 }
2119 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2120 } else {
2121 return nullptr;
2122 }
2123 }
2124 JVM_END
2125
2126 // Constant pool access //////////////////////////////////////////////////////////
2127
2128 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2129 {
2130 JvmtiVMObjectAllocEventCollector oam;
2131 oop mirror = JNIHandles::resolve_non_null(cls);
2132 // Return null for primitives and arrays
2133 if (!java_lang_Class::is_primitive(mirror)) {
2134 Klass* k = java_lang_Class::as_Klass(mirror);
2135 if (k->is_instance_klass()) {
2136 InstanceKlass* k_h = InstanceKlass::cast(k);
2137 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2138 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2139 return JNIHandles::make_local(THREAD, jcp());
2140 }
2141 }
2142 return nullptr;
2143 }
2144 JVM_END
2145
2146
2147 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2148 {
2149 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2150 return cp->length();
2151 }
2152 JVM_END
2153
2154
2155 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2156 {
2157 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2158 bounds_check(cp, index, CHECK_NULL);
2159 constantTag tag = cp->tag_at(index);
2160 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2161 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2162 }
2163 Klass* k = cp->klass_at(index, CHECK_NULL);
2164 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2165 }
2166 JVM_END
2167
2168 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2169 {
2170 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2171 bounds_check(cp, index, CHECK_NULL);
2172 constantTag tag = cp->tag_at(index);
2173 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2174 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2175 }
2176 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2177 if (k == nullptr) return nullptr;
2178 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2179 }
2180 JVM_END
2181
2182 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2183 constantTag tag = cp->tag_at(index);
2184 if (!tag.is_method() && !tag.is_interface_method()) {
2185 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2186 }
2187 int klass_ref = cp->uncached_klass_ref_index_at(index);
2188 Klass* k_o;
2189 if (force_resolution) {
2190 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2191 } else {
2192 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2193 if (k_o == nullptr) return nullptr;
2194 }
2195 InstanceKlass* k = InstanceKlass::cast(k_o);
2196 Symbol* name = cp->uncached_name_ref_at(index);
2197 Symbol* sig = cp->uncached_signature_ref_at(index);
2198 methodHandle m (THREAD, k->find_method(name, sig));
2199 if (m.is_null()) {
2200 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2201 }
2202 oop method;
2203 if (m->is_object_constructor()) {
2204 method = Reflection::new_constructor(m, CHECK_NULL);
2205 } else {
2206 method = Reflection::new_method(m, true, CHECK_NULL);
2207 }
2208 return JNIHandles::make_local(THREAD, method);
2209 }
2210
2211 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2212 {
2213 JvmtiVMObjectAllocEventCollector oam;
2214 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2215 bounds_check(cp, index, CHECK_NULL);
2216 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2217 return res;
2218 }
2219 JVM_END
2220
2221 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2222 {
2223 JvmtiVMObjectAllocEventCollector oam;
2224 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2225 bounds_check(cp, index, CHECK_NULL);
2226 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2227 return res;
2228 }
2229 JVM_END
2230
2231 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2232 constantTag tag = cp->tag_at(index);
2233 if (!tag.is_field()) {
2234 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2235 }
2236 int klass_ref = cp->uncached_klass_ref_index_at(index);
2237 Klass* k_o;
2238 if (force_resolution) {
2239 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2240 } else {
2241 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2242 if (k_o == nullptr) return nullptr;
2243 }
2244 InstanceKlass* k = InstanceKlass::cast(k_o);
2245 Symbol* name = cp->uncached_name_ref_at(index);
2246 Symbol* sig = cp->uncached_signature_ref_at(index);
2247 fieldDescriptor fd;
2248 Klass* target_klass = k->find_field(name, sig, &fd);
2249 if (target_klass == nullptr) {
2250 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2251 }
2252 oop field = Reflection::new_field(&fd, CHECK_NULL);
2253 return JNIHandles::make_local(THREAD, field);
2254 }
2255
2256 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2257 {
2258 JvmtiVMObjectAllocEventCollector oam;
2259 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2260 bounds_check(cp, index, CHECK_NULL);
2261 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2262 return res;
2263 }
2264 JVM_END
2265
2266 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2267 {
2268 JvmtiVMObjectAllocEventCollector oam;
2269 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2270 bounds_check(cp, index, CHECK_NULL);
2271 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2272 return res;
2273 }
2274 JVM_END
2275
2276 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2277 {
2278 JvmtiVMObjectAllocEventCollector oam;
2279 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2280 bounds_check(cp, index, CHECK_NULL);
2281 constantTag tag = cp->tag_at(index);
2282 if (!tag.is_field_or_method()) {
2283 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2284 }
2285 int klass_ref = cp->uncached_klass_ref_index_at(index);
2286 Symbol* klass_name = cp->klass_name_at(klass_ref);
2287 Symbol* member_name = cp->uncached_name_ref_at(index);
2288 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2289 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2290 objArrayHandle dest(THREAD, dest_o);
2291 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2292 dest->obj_at_put(0, str());
2293 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2294 dest->obj_at_put(1, str());
2295 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2296 dest->obj_at_put(2, str());
2297 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2298 }
2299 JVM_END
2300
2301 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2302 {
2303 JvmtiVMObjectAllocEventCollector oam;
2304 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2305 bounds_check(cp, index, CHECK_0);
2306 constantTag tag = cp->tag_at(index);
2307 if (!tag.is_field_or_method()) {
2308 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2309 }
2310 return (jint) cp->uncached_klass_ref_index_at(index);
2311 }
2312 JVM_END
2313
2314 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2315 {
2316 JvmtiVMObjectAllocEventCollector oam;
2317 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2318 bounds_check(cp, index, CHECK_0);
2319 constantTag tag = cp->tag_at(index);
2320 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2321 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2322 }
2323 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2324 }
2325 JVM_END
2326
2327 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2328 {
2329 JvmtiVMObjectAllocEventCollector oam;
2330 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2331 bounds_check(cp, index, CHECK_NULL);
2332 constantTag tag = cp->tag_at(index);
2333 if (!tag.is_name_and_type()) {
2334 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2335 }
2336 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2337 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2338 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2339 objArrayHandle dest(THREAD, dest_o);
2340 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2341 dest->obj_at_put(0, str());
2342 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2343 dest->obj_at_put(1, str());
2344 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2345 }
2346 JVM_END
2347
2348 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2349 {
2350 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2351 bounds_check(cp, index, CHECK_0);
2352 constantTag tag = cp->tag_at(index);
2353 if (!tag.is_int()) {
2354 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2355 }
2356 return cp->int_at(index);
2357 }
2358 JVM_END
2359
2360 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2361 {
2362 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2363 bounds_check(cp, index, CHECK_(0L));
2364 constantTag tag = cp->tag_at(index);
2365 if (!tag.is_long()) {
2366 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2367 }
2368 return cp->long_at(index);
2369 }
2370 JVM_END
2371
2372 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2373 {
2374 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2375 bounds_check(cp, index, CHECK_(0.0f));
2376 constantTag tag = cp->tag_at(index);
2377 if (!tag.is_float()) {
2378 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2379 }
2380 return cp->float_at(index);
2381 }
2382 JVM_END
2383
2384 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2385 {
2386 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2387 bounds_check(cp, index, CHECK_(0.0));
2388 constantTag tag = cp->tag_at(index);
2389 if (!tag.is_double()) {
2390 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2391 }
2392 return cp->double_at(index);
2393 }
2394 JVM_END
2395
2396 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2397 {
2398 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2399 bounds_check(cp, index, CHECK_NULL);
2400 constantTag tag = cp->tag_at(index);
2401 if (!tag.is_string()) {
2402 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2403 }
2404 oop str = cp->string_at(index, CHECK_NULL);
2405 return (jstring) JNIHandles::make_local(THREAD, str);
2406 }
2407 JVM_END
2408
2409 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2410 {
2411 JvmtiVMObjectAllocEventCollector oam;
2412 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2413 bounds_check(cp, index, CHECK_NULL);
2414 constantTag tag = cp->tag_at(index);
2415 if (!tag.is_symbol()) {
2416 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2417 }
2418 Symbol* sym = cp->symbol_at(index);
2419 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2420 return (jstring) JNIHandles::make_local(THREAD, str());
2421 }
2422 JVM_END
2423
2424 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2425 {
2426 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2427 bounds_check(cp, index, CHECK_0);
2428 constantTag tag = cp->tag_at(index);
2429 jbyte result = tag.value();
2430 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2431 // they are changed to the corresponding tags from the JVM spec, so that java code in
2432 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2433 if (tag.is_klass_or_reference()) {
2434 result = JVM_CONSTANT_Class;
2435 } else if (tag.is_string_index()) {
2436 result = JVM_CONSTANT_String;
2437 } else if (tag.is_method_type_in_error()) {
2438 result = JVM_CONSTANT_MethodType;
2439 } else if (tag.is_method_handle_in_error()) {
2440 result = JVM_CONSTANT_MethodHandle;
2441 } else if (tag.is_dynamic_constant_in_error()) {
2442 result = JVM_CONSTANT_Dynamic;
2443 }
2444 return result;
2445 }
2446 JVM_END
2447
2448 // Assertion support. //////////////////////////////////////////////////////////
2449
2450 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2451 assert(cls != nullptr, "bad class");
2452
2453 oop r = JNIHandles::resolve(cls);
2454 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2455 if (java_lang_Class::is_primitive(r)) return false;
2456
2457 Klass* k = java_lang_Class::as_Klass(r);
2458 assert(k->is_instance_klass(), "must be an instance klass");
2459 if (!k->is_instance_klass()) return false;
2460
2461 ResourceMark rm(THREAD);
2462 const char* name = k->name()->as_C_string();
2463 bool system_class = k->class_loader() == nullptr;
2464 return JavaAssertions::enabled(name, system_class);
2465
2466 JVM_END
2467
2468
2469 // Return a new AssertionStatusDirectives object with the fields filled in with
2470 // command-line assertion arguments (i.e., -ea, -da).
2471 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2472 JvmtiVMObjectAllocEventCollector oam;
2473 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2474 return JNIHandles::make_local(THREAD, asd);
2475 JVM_END
2476
2477 // Arrays support /////////////////////////////////////////////////////////////
2478
2479 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2480 oop o = JNIHandles::resolve(array);
2481 Klass* k = o->klass();
2482 if ((o == nullptr) || (!k->is_array_klass())) {
2483 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2484 }
2485 return ArrayKlass::cast(k)->element_access_must_be_atomic();
2486 JVM_END
2487
2488 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2489 oop o = JNIHandles::resolve(array);
2490 Klass* k = o->klass();
2491 if ((o == nullptr) || (!k->is_array_klass())) {
2492 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2493 }
2494 if (k->is_flatArray_klass()) {
2495 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2496 if (!vk->element_access_must_be_atomic()) {
2497 /**
2498 * Need to decide how to implement:
2499 *
2500 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2501 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2502 * "checkcast" & "instanceof"
2503 *
2504 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2505 * possibly per instance lock structure. Said info, could be placed in
2506 * "trailer" rather than disturb the current arrayOop
2507 */
2508 Unimplemented();
2509 }
2510 }
2511 return array;
2512 JVM_END
2513
2514 // Verification ////////////////////////////////////////////////////////////////////////////////
2515
2516 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2517
2518 // RedefineClasses support: bug 6214132 caused verification to fail.
2519 // All functions from this section should call the jvmtiThreadSate function:
2520 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2521 // The function returns a Klass* of the _scratch_class if the verifier
2522 // was invoked in the middle of the class redefinition.
2523 // Otherwise it returns its argument value which is the _the_class Klass*.
2524 // Please, refer to the description in the jvmtiThreadState.hpp.
2525
2526 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2527 oop mirror = JNIHandles::resolve_non_null(cls);
2528 if (java_lang_Class::is_primitive(mirror)) {
2529 return JNI_FALSE;
2530 }
2531 Klass* k = java_lang_Class::as_Klass(mirror);
2532 // This isn't necessary since answer is the same since redefinition
2533 // has already checked this matches for the scratch class.
2534 // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2535 jboolean result = k->is_interface();
2536 assert(!result || k->is_instance_klass(),
2537 "all interfaces are instance types");
2538 return result;
2539 JVM_END
2540
2541
2542 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 return k->name()->as_utf8();
2546 JVM_END
2547
2548
2549 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2550 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2551 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2552 // types will have length zero if this is not an InstanceKlass
2553 // (length is determined by call to JVM_GetClassCPEntriesCount)
2554 if (k->is_instance_klass()) {
2555 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2556 for (int index = cp->length() - 1; index >= 0; index--) {
2557 constantTag tag = cp->tag_at(index);
2558 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2559 }
2560 }
2561 JVM_END
2562
2563
2564 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2565 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2566 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2567 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2568 JVM_END
2569
2570
2571 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2573 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2574 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2575 JVM_END
2576
2577
2578 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2582 JVM_END
2583
2584
2585 // The following methods, used for the verifier, are never called with
2586 // array klasses, so a direct cast to InstanceKlass is safe.
2587 // Typically, these methods are called in a loop with bounds determined
2588 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2589 // zero for arrays.
2590 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2593 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2594 int length = method->checked_exceptions_length();
2595 if (length > 0) {
2596 CheckedExceptionElement* table= method->checked_exceptions_start();
2597 for (int i = 0; i < length; i++) {
2598 exceptions[i] = table[i].class_cp_index;
2599 }
2600 }
2601 JVM_END
2602
2603
2604 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2605 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2606 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2607 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2608 return method->checked_exceptions_length();
2609 JVM_END
2610
2611
2612 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2613 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2614 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2615 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2616 memcpy(code, method->code_base(), method->code_size());
2617 JVM_END
2618
2619
2620 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2622 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2623 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2624 return method->code_size();
2625 JVM_END
2626
2627
2628 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2629 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2630 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2631 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2632 ExceptionTable extable(method);
2633 entry->start_pc = extable.start_pc(entry_index);
2634 entry->end_pc = extable.end_pc(entry_index);
2635 entry->handler_pc = extable.handler_pc(entry_index);
2636 entry->catchType = extable.catch_type_index(entry_index);
2637 JVM_END
2638
2639
2640 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2642 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2643 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2644 return method->exception_table_length();
2645 JVM_END
2646
2647
2648 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2649 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2650 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2651 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2652 return method->access_flags().as_method_flags();
2653 JVM_END
2654
2655
2656 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2657 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2658 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2659 return InstanceKlass::cast(k)->field_access_flags(field_index);
2660 JVM_END
2661
2662
2663 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2664 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2665 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2666 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2667 return method->max_locals();
2668 JVM_END
2669
2670
2671 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2672 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2673 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2674 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2675 return method->size_of_parameters();
2676 JVM_END
2677
2678
2679 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2680 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2681 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2682 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2683 return method->verifier_max_stack();
2684 JVM_END
2685
2686
2687 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2688 ResourceMark rm(THREAD);
2689 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2690 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2691 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2692 return method->is_object_constructor();
2693 JVM_END
2694
2695
2696 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2697 ResourceMark rm(THREAD);
2698 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2699 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2700 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2701 return method->is_overpass();
2702 JVM_END
2703
2704 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2706 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2707 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2708 return method->name()->as_utf8();
2709 JVM_END
2710
2711
2712 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2713 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2714 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2715 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2716 return method->signature()->as_utf8();
2717 JVM_END
2718
2719 /**
2720 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2721 * read entries in the constant pool. Since the old verifier always
2722 * works on a copy of the code, it will not see any rewriting that
2723 * may possibly occur in the middle of verification. So it is important
2724 * that nothing it calls tries to use the cpCache instead of the raw
2725 * constant pool, so we must use cp->uncached_x methods when appropriate.
2726 */
2727 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2728 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2729 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2730 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2731 switch (cp->tag_at(cp_index).value()) {
2732 case JVM_CONSTANT_Fieldref:
2733 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2734 default:
2735 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2736 }
2737 ShouldNotReachHere();
2738 return nullptr;
2739 JVM_END
2740
2741
2742 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_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 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2746 switch (cp->tag_at(cp_index).value()) {
2747 case JVM_CONSTANT_InterfaceMethodref:
2748 case JVM_CONSTANT_Methodref:
2749 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2750 default:
2751 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2752 }
2753 ShouldNotReachHere();
2754 return nullptr;
2755 JVM_END
2756
2757
2758 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2759 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2760 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2761 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2762 switch (cp->tag_at(cp_index).value()) {
2763 case JVM_CONSTANT_InterfaceMethodref:
2764 case JVM_CONSTANT_Methodref:
2765 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2766 default:
2767 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2768 }
2769 ShouldNotReachHere();
2770 return nullptr;
2771 JVM_END
2772
2773
2774 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2775 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2776 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2777 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2778 switch (cp->tag_at(cp_index).value()) {
2779 case JVM_CONSTANT_Fieldref:
2780 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2781 default:
2782 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2783 }
2784 ShouldNotReachHere();
2785 return nullptr;
2786 JVM_END
2787
2788
2789 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2790 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2791 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2792 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2793 Symbol* classname = cp->klass_name_at(cp_index);
2794 return classname->as_utf8();
2795 JVM_END
2796
2797
2798 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2799 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2800 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2801 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2802 switch (cp->tag_at(cp_index).value()) {
2803 case JVM_CONSTANT_Fieldref: {
2804 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2805 Symbol* classname = cp->klass_name_at(class_index);
2806 return classname->as_utf8();
2807 }
2808 default:
2809 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2810 }
2811 ShouldNotReachHere();
2812 return nullptr;
2813 JVM_END
2814
2815
2816 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2817 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2818 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2819 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2820 switch (cp->tag_at(cp_index).value()) {
2821 case JVM_CONSTANT_Methodref:
2822 case JVM_CONSTANT_InterfaceMethodref: {
2823 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2824 Symbol* classname = cp->klass_name_at(class_index);
2825 return classname->as_utf8();
2826 }
2827 default:
2828 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2829 }
2830 ShouldNotReachHere();
2831 return nullptr;
2832 JVM_END
2833
2834
2835 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2836 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2837 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2838 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2839 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2840 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2841 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2842 switch (cp->tag_at(cp_index).value()) {
2843 case JVM_CONSTANT_Fieldref: {
2844 Symbol* name = cp->uncached_name_ref_at(cp_index);
2845 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2846 InstanceKlass* ik = InstanceKlass::cast(k_called);
2847 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2848 if (fs.name() == name && fs.signature() == signature) {
2849 return fs.access_flags().as_field_flags();
2850 }
2851 }
2852 return -1;
2853 }
2854 default:
2855 fatal("JVM_GetCPFieldModifiers: illegal constant");
2856 }
2857 ShouldNotReachHere();
2858 return 0;
2859 JVM_END
2860
2861
2862 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2863 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2864 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2865 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2866 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2867 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2868 switch (cp->tag_at(cp_index).value()) {
2869 case JVM_CONSTANT_Methodref:
2870 case JVM_CONSTANT_InterfaceMethodref: {
2871 Symbol* name = cp->uncached_name_ref_at(cp_index);
2872 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2873 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2874 int methods_count = methods->length();
2875 for (int i = 0; i < methods_count; i++) {
2876 Method* method = methods->at(i);
2877 if (method->name() == name && method->signature() == signature) {
2878 return method->access_flags().as_method_flags();
2879 }
2880 }
2881 return -1;
2882 }
2883 default:
2884 fatal("JVM_GetCPMethodModifiers: illegal constant");
2885 }
2886 ShouldNotReachHere();
2887 return 0;
2888 JVM_END
2889
2890
2891 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2892
2893 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2894 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2895 JVM_END
2896
2897
2898 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2899 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2900 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2901 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2902 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2903 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2904 JVM_END
2905
2906 // Printing support //////////////////////////////////////////////////
2907 extern "C" {
2908
2909 ATTRIBUTE_PRINTF(3, 0)
2910 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2911 // Reject count values that are negative signed values converted to
2912 // unsigned; see bug 4399518, 4417214
2913 if ((intptr_t)count <= 0) return -1;
2914
2915 int result = os::vsnprintf(str, count, fmt, args);
2916 if (result > 0 && (size_t)result >= count) {
2917 result = -1;
2918 }
2919
2920 return result;
2921 }
2922
2923 ATTRIBUTE_PRINTF(3, 4)
2924 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2925 va_list args;
2926 int len;
2927 va_start(args, fmt);
2928 len = jio_vsnprintf(str, count, fmt, args);
2929 va_end(args);
2930 return len;
2931 }
2932
2933 ATTRIBUTE_PRINTF(2, 3)
2934 int jio_fprintf(FILE* f, const char *fmt, ...) {
2935 int len;
2936 va_list args;
2937 va_start(args, fmt);
2938 len = jio_vfprintf(f, fmt, args);
2939 va_end(args);
2940 return len;
2941 }
2942
2943 ATTRIBUTE_PRINTF(2, 0)
2944 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2945 if (Arguments::vfprintf_hook() != nullptr) {
2946 return Arguments::vfprintf_hook()(f, fmt, args);
2947 } else {
2948 return vfprintf(f, fmt, args);
2949 }
2950 }
2951
2952 ATTRIBUTE_PRINTF(1, 2)
2953 JNIEXPORT int jio_printf(const char *fmt, ...) {
2954 int len;
2955 va_list args;
2956 va_start(args, fmt);
2957 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2958 va_end(args);
2959 return len;
2960 }
2961
2962 // HotSpot specific jio method
2963 void jio_print(const char* s, size_t len) {
2964 // Try to make this function as atomic as possible.
2965 if (Arguments::vfprintf_hook() != nullptr) {
2966 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2967 } else {
2968 // Make an unused local variable to avoid warning from gcc compiler.
2969 bool dummy = os::write(defaultStream::output_fd(), s, len);
2970 }
2971 }
2972
2973 } // Extern C
2974
2975 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2976
2977 // In most of the JVM thread support functions we need to access the
2978 // thread through a ThreadsListHandle to prevent it from exiting and
2979 // being reclaimed while we try to operate on it. The exceptions to this
2980 // rule are when operating on the current thread, or if the monitor of
2981 // the target java.lang.Thread is locked at the Java level - in both
2982 // cases the target cannot exit.
2983
2984 static void thread_entry(JavaThread* thread, TRAPS) {
2985 HandleMark hm(THREAD);
2986 Handle obj(THREAD, thread->threadObj());
2987 JavaValue result(T_VOID);
2988 JavaCalls::call_virtual(&result,
2989 obj,
2990 vmClasses::Thread_klass(),
2991 vmSymbols::run_method_name(),
2992 vmSymbols::void_method_signature(),
2993 THREAD);
2994 }
2995
2996
2997 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2998 #if INCLUDE_CDS
2999 if (CDSConfig::allow_only_single_java_thread()) {
3000 // During java -Xshare:dump, if we allow multiple Java threads to
3001 // execute in parallel, symbols and classes may be loaded in
3002 // random orders which will make the resulting CDS archive
3003 // non-deterministic.
3004 //
3005 // Lucikly, during java -Xshare:dump, it's important to run only
3006 // the code in the main Java thread (which is NOT started here) that
3007 // creates the module graph, etc. It's safe to not start the other
3008 // threads which are launched by class static initializers
3009 // (ReferenceHandler, FinalizerThread and CleanerImpl).
3010 if (log_is_enabled(Info, cds)) {
3011 ResourceMark rm;
3012 oop t = JNIHandles::resolve_non_null(jthread);
3013 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
3014 }
3015 return;
3016 }
3017 #endif
3018 JavaThread *native_thread = nullptr;
3019
3020 // We cannot hold the Threads_lock when we throw an exception,
3021 // due to rank ordering issues. Example: we might need to grab the
3022 // Heap_lock while we construct the exception.
3023 bool throw_illegal_thread_state = false;
3024
3025 // We must release the Threads_lock before we can post a jvmti event
3026 // in Thread::start.
3027 {
3028 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
3029 // Ensure that the C++ Thread and OSThread structures aren't freed before
3030 // we operate.
3031 MutexLocker ml(Threads_lock);
3032
3033 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3034 // re-starting an already started thread, so we should usually find
3035 // that the JavaThread is null. However for a JNI attached thread
3036 // there is a small window between the Thread object being created
3037 // (with its JavaThread set) and the update to its threadStatus, so we
3038 // have to check for this
3039 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
3040 throw_illegal_thread_state = true;
3041 } else {
3042 jlong size =
3043 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3044 // Allocate the C++ Thread structure and create the native thread. The
3045 // stack size retrieved from java is 64-bit signed, but the constructor takes
3046 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3047 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3048 // - Avoid passing negative values which would result in really large stacks.
3049 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3050 size_t sz = size > 0 ? (size_t) size : 0;
3051 native_thread = new JavaThread(&thread_entry, sz);
3052
3053 // At this point it may be possible that no osthread was created for the
3054 // JavaThread due to lack of memory. Check for this situation and throw
3055 // an exception if necessary. Eventually we may want to change this so
3056 // that we only grab the lock if the thread was created successfully -
3057 // then we can also do this check and throw the exception in the
3058 // JavaThread constructor.
3059 if (native_thread->osthread() != nullptr) {
3060 // Note: the current thread is not being used within "prepare".
3061 native_thread->prepare(jthread);
3062 }
3063 }
3064 }
3065
3066 if (throw_illegal_thread_state) {
3067 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3068 }
3069
3070 assert(native_thread != nullptr, "Starting null thread?");
3071
3072 if (native_thread->osthread() == nullptr) {
3073 ResourceMark rm(thread);
3074 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3075 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3076 // No one should hold a reference to the 'native_thread'.
3077 native_thread->smr_delete();
3078 if (JvmtiExport::should_post_resource_exhausted()) {
3079 JvmtiExport::post_resource_exhausted(
3080 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3081 os::native_thread_creation_failed_msg());
3082 }
3083 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3084 os::native_thread_creation_failed_msg());
3085 }
3086
3087 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3088
3089 Thread::start(native_thread);
3090
3091 JVM_END
3092
3093
3094 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3095 ThreadsListHandle tlh(thread);
3096 oop java_thread = nullptr;
3097 JavaThread* receiver = nullptr;
3098 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3099 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3100
3101 if (is_alive) {
3102 // jthread refers to a live JavaThread.
3103 Thread::set_priority(receiver, (ThreadPriority)prio);
3104 }
3105 // Implied else: If the JavaThread hasn't started yet, then the
3106 // priority set in the java.lang.Thread object above will be pushed
3107 // down when it does start.
3108 JVM_END
3109
3110
3111 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3112 HOTSPOT_THREAD_YIELD();
3113 os::naked_yield();
3114 JVM_END
3115
3116 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3117 if (nanos < 0) {
3118 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3119 }
3120
3121 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3122 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3123 }
3124
3125 // Save current thread state and restore it at the end of this block.
3126 // And set new thread state to SLEEPING.
3127 JavaThreadSleepState jtss(thread);
3128
3129 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3130
3131 if (nanos == 0) {
3132 os::naked_yield();
3133 } else {
3134 ThreadState old_state = thread->osthread()->get_state();
3135 thread->osthread()->set_state(SLEEPING);
3136 if (!thread->sleep_nanos(nanos)) { // interrupted
3137 // An asynchronous exception could have been thrown on
3138 // us while we were sleeping. We do not overwrite those.
3139 if (!HAS_PENDING_EXCEPTION) {
3140 HOTSPOT_THREAD_SLEEP_END(1);
3141
3142 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3143 // to properly restore the thread state. That's likely wrong.
3144 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3145 }
3146 }
3147 thread->osthread()->set_state(old_state);
3148 }
3149 HOTSPOT_THREAD_SLEEP_END(0);
3150 JVM_END
3151
3152 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3153 oop jthread = thread->threadObj();
3154 assert(jthread != nullptr, "no current carrier thread!");
3155 return JNIHandles::make_local(THREAD, jthread);
3156 JVM_END
3157
3158 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3159 oop theThread = thread->vthread();
3160 assert(theThread != (oop)nullptr, "no current thread!");
3161 return JNIHandles::make_local(THREAD, theThread);
3162 JVM_END
3163
3164 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3165 jobject theThread))
3166 oop threadObj = JNIHandles::resolve(theThread);
3167 thread->set_vthread(threadObj);
3168
3169 // Set _monitor_owner_id of new current Thread
3170 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3171
3172 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3173 JVM_END
3174
3175 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3176 return ThreadIdentifier::unsafe_offset();
3177 JVM_END
3178
3179 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3180 ThreadsListHandle tlh(thread);
3181 JavaThread* receiver = nullptr;
3182 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3183 if (is_alive) {
3184 // jthread refers to a live JavaThread.
3185 receiver->interrupt();
3186 }
3187 JVM_END
3188
3189 // Return true iff the current thread has locked the object passed in
3190
3191 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3192 if (obj == nullptr) {
3193 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3194 }
3195 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3196 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3197 JVM_END
3198
3199 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3200 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3201 return JNIHandles::make_local(THREAD, trace);
3202 JVM_END
3203
3204 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3205 // We don't use a ThreadsListHandle here because the current thread
3206 // must be alive.
3207 oop java_thread = JNIHandles::resolve_non_null(jthread);
3208 JavaThread* thr = java_lang_Thread::thread(java_thread);
3209 if (thread == thr && !thr->has_attached_via_jni()) {
3210 // Thread naming is only supported for the current thread and
3211 // we don't set the name of an attached thread to avoid stepping
3212 // on other programs.
3213 ResourceMark rm(thread);
3214 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3215 os::set_native_thread_name(thread_name);
3216 }
3217 JVM_END
3218
3219 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3220 oop theCache = thread->scopedValueCache();
3221 return JNIHandles::make_local(THREAD, theCache);
3222 JVM_END
3223
3224 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3225 jobject theCache))
3226 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3227 thread->set_scopedValueCache(objs);
3228 JVM_END
3229
3230
3231 // java.lang.Package ////////////////////////////////////////////////////////////////
3232
3233
3234 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3235 ResourceMark rm(THREAD);
3236 JvmtiVMObjectAllocEventCollector oam;
3237 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3238 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3239 return (jstring) JNIHandles::make_local(THREAD, result);
3240 JVM_END
3241
3242
3243 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3244 JvmtiVMObjectAllocEventCollector oam;
3245 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3246 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3247 JVM_END
3248
3249
3250 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3251
3252
3253 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3254 MonitorLocker ml(Heap_lock);
3255 oop ref = Universe::reference_pending_list();
3256 if (ref != nullptr) {
3257 Universe::clear_reference_pending_list();
3258 }
3259 return JNIHandles::make_local(THREAD, ref);
3260 JVM_END
3261
3262 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3263 MonitorLocker ml(Heap_lock);
3264 return Universe::has_reference_pending_list();
3265 JVM_END
3266
3267 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3268 MonitorLocker ml(Heap_lock);
3269 while (!Universe::has_reference_pending_list()) {
3270 ml.wait();
3271 }
3272 JVM_END
3273
3274 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3275 oop ref_oop = JNIHandles::resolve_non_null(ref);
3276 // PhantomReference has it's own implementation of refersTo().
3277 // See: JVM_PhantomReferenceRefersTo
3278 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3279 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3280 return referent == JNIHandles::resolve(o);
3281 JVM_END
3282
3283 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3284 oop ref_oop = JNIHandles::resolve_non_null(ref);
3285 // FinalReference has it's own implementation of clear().
3286 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3287 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3288 // If the referent has already been cleared then done.
3289 // However, if the referent is dead but has not yet been cleared by
3290 // concurrent reference processing, it should NOT be cleared here.
3291 // Instead, clearing should be left to the GC. Clearing it here could
3292 // detectably lose an expected notification, which is impossible with
3293 // STW reference processing. The clearing in enqueue() doesn't have
3294 // this problem, since the enqueue covers the notification, but it's not
3295 // worth the effort to handle that case specially.
3296 return;
3297 }
3298 java_lang_ref_Reference::clear_referent(ref_oop);
3299 JVM_END
3300
3301
3302 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3303
3304
3305 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3306 oop ref_oop = JNIHandles::resolve_non_null(ref);
3307 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3308 return referent == JNIHandles::resolve(o);
3309 JVM_END
3310
3311
3312 // ObjectInputStream ///////////////////////////////////////////////////////////////
3313
3314 // Return the first user-defined class loader up the execution stack, or null
3315 // if only code from the bootstrap or platform class loader is on the stack.
3316
3317 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3318 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3319 InstanceKlass* ik = vfst.method()->method_holder();
3320 oop loader = ik->class_loader();
3321 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3322 return JNIHandles::make_local(THREAD, loader);
3323 }
3324 }
3325 return nullptr;
3326 JVM_END
3327
3328
3329 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3330
3331
3332 // resolve array handle and check arguments
3333 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3334 if (arr == nullptr) {
3335 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3336 }
3337 oop a = JNIHandles::resolve_non_null(arr);
3338 if (!a->is_array()) {
3339 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3340 } else if (type_array_only && !a->is_typeArray()) {
3341 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3342 }
3343 return arrayOop(a);
3344 }
3345
3346
3347 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3348 arrayOop a = check_array(env, arr, false, CHECK_0);
3349 return a->length();
3350 JVM_END
3351
3352
3353 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3354 JvmtiVMObjectAllocEventCollector oam;
3355 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3356 jvalue value;
3357 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3358 oop box = Reflection::box(&value, type, CHECK_NULL);
3359 return JNIHandles::make_local(THREAD, box);
3360 JVM_END
3361
3362
3363 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3364 jvalue value;
3365 value.i = 0; // to initialize value before getting used in CHECK
3366 arrayOop a = check_array(env, arr, true, CHECK_(value));
3367 assert(a->is_typeArray(), "just checking");
3368 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3369 BasicType wide_type = (BasicType) wCode;
3370 if (type != wide_type) {
3371 Reflection::widen(&value, type, wide_type, CHECK_(value));
3372 }
3373 return value;
3374 JVM_END
3375
3376
3377 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3378 arrayOop a = check_array(env, arr, false, CHECK);
3379 oop box = JNIHandles::resolve(val);
3380 jvalue value;
3381 value.i = 0; // to initialize value before getting used in CHECK
3382 BasicType value_type;
3383 if (a->is_objArray()) {
3384 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3385 value_type = Reflection::unbox_for_regular_object(box, &value);
3386 } else {
3387 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3388 }
3389 Reflection::array_set(&value, a, index, value_type, CHECK);
3390 JVM_END
3391
3392
3393 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3394 arrayOop a = check_array(env, arr, true, CHECK);
3395 assert(a->is_typeArray(), "just checking");
3396 BasicType value_type = (BasicType) vCode;
3397 Reflection::array_set(&v, a, index, value_type, CHECK);
3398 JVM_END
3399
3400
3401 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3402 JvmtiVMObjectAllocEventCollector oam;
3403 oop element_mirror = JNIHandles::resolve(eltClass);
3404 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3405 return JNIHandles::make_local(THREAD, result);
3406 JVM_END
3407
3408
3409 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3410 JvmtiVMObjectAllocEventCollector oam;
3411 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3412 oop element_mirror = JNIHandles::resolve(eltClass);
3413 assert(dim_array->is_typeArray(), "just checking");
3414 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3415 return JNIHandles::make_local(THREAD, result);
3416 JVM_END
3417
3418
3419 // Library support ///////////////////////////////////////////////////////////////////////////
3420
3421 JVM_LEAF(void*, JVM_LoadZipLibrary())
3422 return ZipLibrary::handle();
3423 JVM_END
3424
3425 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3426 //%note jvm_ct
3427 char ebuf[1024];
3428 void *load_result;
3429 {
3430 ThreadToNativeFromVM ttnfvm(thread);
3431 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3432 }
3433 if (load_result == nullptr) {
3434 if (throwException) {
3435 char msg[1024];
3436 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3437 // Since 'ebuf' may contain a string encoded using
3438 // platform encoding scheme, we need to pass
3439 // Exceptions::unsafe_to_utf8 to the new_exception method
3440 // as the last argument. See bug 6367357.
3441 Handle h_exception =
3442 Exceptions::new_exception(thread,
3443 vmSymbols::java_lang_UnsatisfiedLinkError(),
3444 msg, Exceptions::unsafe_to_utf8);
3445
3446 THROW_HANDLE_NULL(h_exception);
3447 } else {
3448 log_info(library)("Failed to load library %s", name);
3449 return load_result;
3450 }
3451 }
3452 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3453 return load_result;
3454 JVM_END
3455
3456
3457 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3458 os::dll_unload(handle);
3459 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3460 JVM_END
3461
3462
3463 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3464 void* find_result = os::dll_lookup(handle, name);
3465 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3466 find_result != nullptr ? "Found" : "Failed to find",
3467 name, p2i(handle));
3468 return find_result;
3469 JVM_END
3470
3471
3472 // JNI version ///////////////////////////////////////////////////////////////////////////////
3473
3474 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3475 return Threads::is_supported_jni_version_including_1_1(version);
3476 JVM_END
3477
3478
3479 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3480 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3481 JVM_END
3482
3483 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3484 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3485 JVM_END
3486
3487 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3488 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3489 JVM_END
3490
3491 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3492 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3493 JVM_END
3494
3495 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3496 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3497 JVM_END
3498
3499 // String support ///////////////////////////////////////////////////////////////////////////
3500
3501 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3502 JvmtiVMObjectAllocEventCollector oam;
3503 if (str == nullptr) return nullptr;
3504 oop string = JNIHandles::resolve_non_null(str);
3505 oop result = StringTable::intern(string, CHECK_NULL);
3506 return (jstring) JNIHandles::make_local(THREAD, result);
3507 JVM_END
3508
3509
3510 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3511
3512 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3513 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3514 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3515 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3516 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3517 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3518
3519
3520 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3521 VM_Exit::block_if_vm_exited();
3522 return new PlatformMutex();
3523 }
3524
3525
3526 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3527 VM_Exit::block_if_vm_exited();
3528 delete ((PlatformMutex*) mon);
3529 }
3530
3531
3532 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3533 VM_Exit::block_if_vm_exited();
3534 ((PlatformMutex*) mon)->lock();
3535 return 0;
3536 }
3537
3538
3539 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3540 VM_Exit::block_if_vm_exited();
3541 ((PlatformMutex*) mon)->unlock();
3542 }
3543
3544
3545 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3546
3547 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3548 Handle loader, jboolean throwError, TRAPS) {
3549 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3550
3551 // Check if we should initialize the class
3552 if (init && klass->is_instance_klass()) {
3553 klass->initialize(CHECK_NULL);
3554 }
3555 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3556 }
3557
3558
3559 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3560
3561 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3562 Handle method_handle;
3563 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3564 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3565 Handle receiver(THREAD, JNIHandles::resolve(obj));
3566 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3567 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3568 jobject res = JNIHandles::make_local(THREAD, result);
3569 if (JvmtiExport::should_post_vm_object_alloc()) {
3570 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3571 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3572 if (java_lang_Class::is_primitive(ret_type)) {
3573 // Only for primitive type vm allocates memory for java object.
3574 // See box() method.
3575 JvmtiExport::post_vm_object_alloc(thread, result);
3576 }
3577 }
3578 return res;
3579 } else {
3580 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3581 }
3582 JVM_END
3583
3584
3585 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3586 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3587 oop constructor_mirror = JNIHandles::resolve(c);
3588 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3589 jobject res = JNIHandles::make_local(THREAD, result);
3590 if (JvmtiExport::should_post_vm_object_alloc()) {
3591 JvmtiExport::post_vm_object_alloc(thread, result);
3592 }
3593 return res;
3594 JVM_END
3595
3596 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3598 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3599 JVM_END
3600
3601 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3602 jclass caller,
3603 jstring interfaceMethodName,
3604 jobject factoryType,
3605 jobject interfaceMethodType,
3606 jobject implementationMember,
3607 jobject dynamicMethodType,
3608 jclass lambdaProxyClass))
3609 #if INCLUDE_CDS
3610 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3611 return;
3612 }
3613
3614 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3615 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3616 if (caller_ik->is_hidden()) {
3617 // Hidden classes not of type lambda proxy classes are currently not being archived.
3618 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3619 // registered for archiving.
3620 return;
3621 }
3622 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3623 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3624 assert(lambda_ik->is_hidden(), "must be a hidden class");
3625 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3626
3627 Symbol* interface_method_name = nullptr;
3628 if (interfaceMethodName != nullptr) {
3629 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3630 }
3631 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3632 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3633
3634 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3635 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3636
3637 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3638 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3639 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3640
3641 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3642 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3643
3644 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3645 interface_method_type, m, dynamic_method_type, THREAD);
3646 #endif // INCLUDE_CDS
3647 JVM_END
3648
3649 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3650 jclass caller,
3651 jstring interfaceMethodName,
3652 jobject factoryType,
3653 jobject interfaceMethodType,
3654 jobject implementationMember,
3655 jobject dynamicMethodType))
3656 #if INCLUDE_CDS
3657
3658 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3659 implementationMember == nullptr || dynamicMethodType == nullptr) {
3660 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3661 }
3662
3663 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3664 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3665 if (!caller_ik->is_shared()) {
3666 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3667 return nullptr;
3668 }
3669
3670 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3671 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3672 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3673
3674 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3675 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3676
3677 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3678 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3679 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3680
3681 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3682 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3683
3684 InstanceKlass* loaded_lambda =
3685 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3686 interface_method_type, m, dynamic_method_type,
3687 CHECK_(nullptr));
3688 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3689 #else
3690 return nullptr;
3691 #endif // INCLUDE_CDS
3692 JVM_END
3693
3694 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3695 if (CDSConfig::is_dumping_static_archive()) {
3696 // We do this so that the default CDS archive can be deterministic.
3697 const char* release = VM_Version::vm_release();
3698 const char* dbg_level = VM_Version::jdk_debug_level();
3699 const char* version = VM_Version::internal_vm_info_string();
3700 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3701 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3702 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3703 seed += (jlong)VM_Version::vm_major_version();
3704 seed += (jlong)VM_Version::vm_minor_version();
3705 seed += (jlong)VM_Version::vm_security_version();
3706 seed += (jlong)VM_Version::vm_patch_version();
3707 if (seed == 0) { // don't let this ever be zero.
3708 seed = 0x87654321;
3709 }
3710 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3711 return seed;
3712 } else {
3713 return 0;
3714 }
3715 JVM_END
3716
3717 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3718 return CDSConfig::get_status();
3719 JVM_END
3720
3721 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3722 #if INCLUDE_CDS
3723 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3724 if (line != nullptr) {
3725 ResourceMark rm(THREAD);
3726 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3727 char* c_line = java_lang_String::as_utf8_string(h_line());
3728 if (CDSConfig::is_dumping_dynamic_archive()) {
3729 // Note: LambdaFormInvokers::append take same format which is not
3730 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3731 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3732 }
3733 if (ClassListWriter::is_enabled()) {
3734 ClassListWriter w;
3735 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3736 }
3737 }
3738 #endif // INCLUDE_CDS
3739 JVM_END
3740
3741 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3742 #if INCLUDE_CDS
3743 ResourceMark rm(THREAD);
3744 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3745 char* file_name = java_lang_String::as_utf8_string(file_handle());
3746 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3747 #endif // INCLUDE_CDS
3748 JVM_END
3749
3750 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3751 #if INCLUDE_CDS
3752 ResourceMark rm(THREAD);
3753 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3754 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3755 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3756 #endif // INCLUDE_CDS
3757 JVM_END
3758
3759 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3760 #if INCLUDE_CDS
3761 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3762 if (!k->is_instance_klass()) {
3763 return false;
3764 } else {
3765 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3766 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3767 // This class will be cached in AOT-initialized state. No need for init barriers.
3768 return false;
3769 } else {
3770 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3771 // must emit barriers to ensure class initialization during production run.
3772 ResourceMark rm(THREAD);
3773 log_debug(cds)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3774 return true;
3775 }
3776 }
3777 #else
3778 return false;
3779 #endif // INCLUDE_CDS
3780 JVM_END
3781
3782 // Returns an array of all live Thread objects (VM internal JavaThreads,
3783 // jvmti agent threads, and JNI attaching threads are skipped)
3784 // See CR 6404306 regarding JNI attaching threads
3785 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3786 ResourceMark rm(THREAD);
3787 ThreadsListEnumerator tle(THREAD, false, false);
3788 JvmtiVMObjectAllocEventCollector oam;
3789
3790 int num_threads = tle.num_threads();
3791 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3792 objArrayHandle threads_ah(THREAD, r);
3793
3794 for (int i = 0; i < num_threads; i++) {
3795 Handle h = tle.get_threadObj(i);
3796 threads_ah->obj_at_put(i, h());
3797 }
3798
3799 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3800 JVM_END
3801
3802
3803 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3804 // Return StackTraceElement[][], each element is the stack trace of a thread in
3805 // the corresponding entry in the given threads array
3806 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3807 JvmtiVMObjectAllocEventCollector oam;
3808
3809 // Check if threads is null
3810 if (threads == nullptr) {
3811 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3812 }
3813
3814 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3815 objArrayHandle ah(THREAD, a);
3816 int num_threads = ah->length();
3817 // check if threads is non-empty array
3818 if (num_threads == 0) {
3819 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3820 }
3821
3822 // check if threads is not an array of objects of Thread class
3823 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3824 if (k != vmClasses::Thread_klass()) {
3825 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3826 }
3827
3828 ResourceMark rm(THREAD);
3829
3830 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3831 for (int i = 0; i < num_threads; i++) {
3832 oop thread_obj = ah->obj_at(i);
3833 instanceHandle h(THREAD, (instanceOop) thread_obj);
3834 thread_handle_array->append(h);
3835 }
3836
3837 // The JavaThread references in thread_handle_array are validated
3838 // in VM_ThreadDump::doit().
3839 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3840 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3841
3842 JVM_END
3843
3844 // JVM monitoring and management support
3845 JVM_LEAF(void*, JVM_GetManagement(jint version))
3846 return Management::get_jmm_interface(version);
3847 JVM_END
3848
3849 // com.sun.tools.attach.VirtualMachine agent properties support
3850 //
3851 // Initialize the agent properties with the properties maintained in the VM
3852 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3853 ResourceMark rm;
3854
3855 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3856
3857 PUTPROP(props, "sun.java.command", Arguments::java_command());
3858 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3859 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3860 return properties;
3861 JVM_END
3862
3863 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3864 {
3865 JvmtiVMObjectAllocEventCollector oam;
3866
3867 if (ofClass == nullptr) {
3868 return nullptr;
3869 }
3870 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3871 // Special handling for primitive objects
3872 if (java_lang_Class::is_primitive(mirror())) {
3873 return nullptr;
3874 }
3875 Klass* k = java_lang_Class::as_Klass(mirror());
3876 if (!k->is_instance_klass()) {
3877 return nullptr;
3878 }
3879 InstanceKlass* ik = InstanceKlass::cast(k);
3880 int encl_method_class_idx = ik->enclosing_method_class_index();
3881 if (encl_method_class_idx == 0) {
3882 return nullptr;
3883 }
3884 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3885 objArrayHandle dest(THREAD, dest_o);
3886 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3887 dest->obj_at_put(0, enc_k->java_mirror());
3888 int encl_method_method_idx = ik->enclosing_method_method_index();
3889 if (encl_method_method_idx != 0) {
3890 Symbol* sym = ik->constants()->symbol_at(
3891 extract_low_short_from_int(
3892 ik->constants()->name_and_type_at(encl_method_method_idx)));
3893 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3894 dest->obj_at_put(1, str());
3895 sym = ik->constants()->symbol_at(
3896 extract_high_short_from_int(
3897 ik->constants()->name_and_type_at(encl_method_method_idx)));
3898 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3899 dest->obj_at_put(2, str());
3900 }
3901 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3902 }
3903 JVM_END
3904
3905 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3906 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3907 ResourceMark rm(THREAD);
3908
3909 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3910 return nullptr;
3911 }
3912
3913 char** vm_flags = Arguments::jvm_flags_array();
3914 char** vm_args = Arguments::jvm_args_array();
3915 int num_flags = Arguments::num_jvm_flags();
3916 int num_args = Arguments::num_jvm_args();
3917
3918 InstanceKlass* ik = vmClasses::String_klass();
3919 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3920 objArrayHandle result_h(THREAD, r);
3921
3922 int index = 0;
3923 for (int j = 0; j < num_flags; j++, index++) {
3924 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3925 result_h->obj_at_put(index, h());
3926 }
3927 for (int i = 0; i < num_args; i++, index++) {
3928 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3929 result_h->obj_at_put(index, h());
3930 }
3931 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3932 JVM_END
3933
3934 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3935 return os::get_signal_number(name);
3936 JVM_END
3937
3938 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3939 #if INCLUDE_JVMTI
3940 if (!DoJVMTIVirtualThreadTransitions) {
3941 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3942 return;
3943 }
3944 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3945 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3946 } else {
3947 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3948 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3949 }
3950 #endif
3951 JVM_END
3952
3953 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3954 #if INCLUDE_JVMTI
3955 if (!DoJVMTIVirtualThreadTransitions) {
3956 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3957 return;
3958 }
3959 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3960 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3961 } else {
3962 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3963 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3964 }
3965 #endif
3966 JVM_END
3967
3968 // If notifications are disabled then just update the VTMS transition bit and return.
3969 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3970 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3971 #if INCLUDE_JVMTI
3972 if (!DoJVMTIVirtualThreadTransitions) {
3973 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3974 return;
3975 }
3976 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3977 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3978 } else {
3979 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3980 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3981 }
3982 #endif
3983 JVM_END
3984
3985 // If notifications are disabled then just update the VTMS transition bit and return.
3986 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3987 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3988 #if INCLUDE_JVMTI
3989 if (!DoJVMTIVirtualThreadTransitions) {
3990 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3991 return;
3992 }
3993 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3994 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3995 } else {
3996 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3997 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3998 }
3999 #endif
4000 JVM_END
4001
4002 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
4003 // Needed to avoid deadlocks with JVMTI suspend mechanism.
4004 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
4005 #if INCLUDE_JVMTI
4006 if (!DoJVMTIVirtualThreadTransitions) {
4007 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4008 return;
4009 }
4010 assert(thread->is_disable_suspend() != (bool)enter,
4011 "nested or unbalanced monitor enter/exit is not allowed");
4012 thread->toggle_is_disable_suspend();
4013 #endif
4014 JVM_END
4015
4016 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
4017 #if INCLUDE_JFR
4018 freeze_result result = THREAD->last_freeze_fail_result();
4019 assert(result != freeze_ok, "sanity check");
4020 EventVirtualThreadPinned event(UNTIMED);
4021 event.set_starttime(THREAD->last_freeze_fail_time());
4022 if (event.should_commit()) {
4023 ResourceMark rm(THREAD);
4024 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
4025 THREAD->post_vthread_pinned_event(&event, str, result);
4026 }
4027 #endif
4028 JVM_END
4029
4030 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
4031 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
4032 assert(parkEvent != nullptr, "not initialized");
4033
4034 OopHandle& list_head = ObjectMonitor::vthread_list_head();
4035 oop vthread_head = nullptr;
4036 while (true) {
4037 if (list_head.peek() != nullptr) {
4038 for (;;) {
4039 oop head = list_head.resolve();
4040 if (list_head.cmpxchg(head, nullptr) == head) {
4041 return JNIHandles::make_local(THREAD, head);
4042 }
4043 }
4044 }
4045 ThreadBlockInVM tbivm(THREAD);
4046 parkEvent->park();
4047 }
4048 JVM_END
4049 /*
4050 * Return the current class's class file version. The low order 16 bits of the
4051 * returned jint contain the class's major version. The high order 16 bits
4052 * contain the class's minor version.
4053 */
4054 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4055 oop mirror = JNIHandles::resolve_non_null(current);
4056 if (java_lang_Class::is_primitive(mirror)) {
4057 // return latest major version and minor version of 0.
4058 return JVM_CLASSFILE_MAJOR_VERSION;
4059 }
4060 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4061
4062 Klass* c = java_lang_Class::as_Klass(mirror);
4063 assert(c->is_instance_klass(), "must be");
4064 InstanceKlass* ik = InstanceKlass::cast(c);
4065 return (ik->minor_version() << 16) | ik->major_version();
4066 JVM_END
4067
4068 /*
4069 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4070 * get the value will see a materialized value and not a scalar-replaced
4071 * null value.
4072 */
4073 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4074 JVM_EnsureMaterializedForStackWalk(env, value);
4075 JVM_END
4076
4077 /*
4078 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4079 */
4080 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4081 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4082 JVM_END