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 // if (!vk->is_implicitly_constructible()) {
489 // THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible");
490 // }
491 oop array = nullptr;
492 if (vk->flat_array() && vk->has_non_atomic_layout()) {
493 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL);
494 for (int i = 0; i < len; i++) {
495 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL);
496 }
497 } else {
498 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
499 for (int i = 0; i < len; i++) {
500 ((objArrayOop)array)->obj_at_put(i, init_h());
501 }
502 }
503 return (jarray) JNIHandles::make_local(THREAD, array);
504 JVM_END
505
506 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
507 oop mirror = JNIHandles::resolve_non_null(elmClass);
508 oop init = JNIHandles::resolve(initVal);
509 if (init == nullptr) {
510 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
511 }
512 Handle init_h(THREAD, init);
513 Klass* klass = java_lang_Class::as_Klass(mirror);
514 if (klass != init_h()->klass()) {
515 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
516 }
517 validate_array_arguments(klass, len, CHECK_NULL);
518 InlineKlass* vk = InlineKlass::cast(klass);
519 // if (!vk->is_implicitly_constructible()) {
520 // THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible");
521 // }
522 oop array = nullptr;
523 if (UseArrayFlattening && vk->is_naturally_atomic() && vk->has_non_atomic_layout()) {
524 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL);
525 for (int i = 0; i < len; i++) {
526 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL);
527 }
528 } else if (UseArrayFlattening && vk->has_atomic_layout()) {
529 array = oopFactory::new_flatArray(vk, len, LayoutKind::ATOMIC_FLAT, CHECK_NULL);
530 for (int i = 0; i < len; i++) {
531 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL);
532 }
533 } else {
534 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
535 for (int i = 0; i < len; i++) {
536 // need a type check here
537
538 ((objArrayOop)array)->obj_at_put(i, init_h());
539 }
540 }
541 return (jarray) JNIHandles::make_local(THREAD, array);
542 JVM_END
543
544 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
545 oop mirror = JNIHandles::resolve_non_null(elmClass);
546 Klass* klass = java_lang_Class::as_Klass(mirror);
547 klass->initialize(CHECK_NULL);
548 validate_array_arguments(klass, len, CHECK_NULL);
549 InlineKlass* vk = InlineKlass::cast(klass);
550 oop array = nullptr;
551 if (UseArrayFlattening && vk->has_nullable_atomic_layout()) {
552 array = oopFactory::new_flatArray(vk, len, LayoutKind::NULLABLE_ATOMIC_FLAT, CHECK_NULL);
553 } else {
554 array = oopFactory::new_objArray(vk, len, CHECK_NULL);
555 }
556 return (jarray) JNIHandles::make_local(THREAD, array);
557 JVM_END
558
559 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
560 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
561 return oop->is_flatArray();
562 JVM_END
563
564 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
565 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
566 return oop->is_null_free_array();
567 JVM_END
568
569 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
570 // There are multiple cases where an array can/must support atomic access:
571 // - the array is a reference array
572 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
573 // - the array is flat and its component type is naturally atomic
574 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
575 if (oop->is_objArray()) return true;
576 if (oop->is_flatArray()) {
577 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
578 if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) {
579 return true;
580 }
581 if (fak->element_klass()->is_naturally_atomic()) return true;
582 }
583 return false;
584 JVM_END
585
586 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
587
588 extern volatile jint vm_created;
589
590 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
591 EventShutdown event;
592 if (event.should_commit()) {
593 event.set_reason("Shutdown requested from Java");
594 event.commit();
595 }
596 JVM_END
597
598
599 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
600 before_exit(thread, true);
601 vm_exit(code);
602 JVM_END
603
604
605 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
606 if (!DisableExplicitGC) {
607 EventSystemGC event;
608 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
609 Universe::heap()->collect(GCCause::_java_lang_system_gc);
610 event.commit();
611 }
612 JVM_END
613
614
615 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
616 return Universe::heap()->millis_since_last_whole_heap_examined();
617 JVM_END
618
619
620 static inline jlong convert_size_t_to_jlong(size_t val) {
621 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
622 NOT_LP64 (return (jlong)val;)
623 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
624 }
625
626 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
627 size_t n = Universe::heap()->capacity();
628 return convert_size_t_to_jlong(n);
629 JVM_END
630
631
632 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
633 size_t n = Universe::heap()->unused();
634 return convert_size_t_to_jlong(n);
635 JVM_END
636
637
638 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
639 size_t n = Universe::heap()->max_capacity();
640 return convert_size_t_to_jlong(n);
641 JVM_END
642
643
644 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
645 return os::active_processor_count();
646 JVM_END
647
648 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
649 #ifdef LINUX
650 if (UseContainerSupport) {
651 return JNI_TRUE;
652 }
653 #endif
654 return JNI_FALSE;
655 JVM_END
656
657 JVM_LEAF(jboolean, JVM_IsContainerized(void))
658 #ifdef LINUX
659 if (OSContainer::is_containerized()) {
660 return JNI_TRUE;
661 }
662 #endif
663 return JNI_FALSE;
664 JVM_END
665
666 // java.lang.Throwable //////////////////////////////////////////////////////
667
668 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
669 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
670 java_lang_Throwable::fill_in_stack_trace(exception);
671 JVM_END
672
673 // java.lang.NullPointerException ///////////////////////////////////////////
674
675 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
676 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
677
678 oop exc = JNIHandles::resolve_non_null(throwable);
679
680 Method* method;
681 int bci;
682 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
683 return nullptr;
684 }
685 if (method->is_native()) {
686 return nullptr;
687 }
688
689 stringStream ss;
690 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
691 if (ok) {
692 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
693 return (jstring) JNIHandles::make_local(THREAD, result);
694 } else {
695 return nullptr;
696 }
697 JVM_END
698
699 // java.lang.StackTraceElement //////////////////////////////////////////////
700
701
702 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
703 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
704 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
705 objArrayHandle stack_trace(THREAD, st);
706 // Fill in the allocated stack trace
707 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
708 JVM_END
709
710
711 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
712 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
713 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
714 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
715 JVM_END
716
717
718 // java.lang.StackWalker //////////////////////////////////////////////////////
719 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
720 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
721
722 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
723 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
724 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
725 if (!have_name) {
726 oop name = StringTable::intern(method->name(), CHECK);
727 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
728 }
729 if (!have_type) {
730 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
731 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
732 }
733 JVM_END
734
735 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
736 jint skip_frames, jobject contScope, jobject cont,
737 jint buffer_size, jint start_index, jobjectArray frames))
738 if (!thread->has_last_Java_frame()) {
739 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
740 }
741
742 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
743 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
744 Handle cont_h(THREAD, JNIHandles::resolve(cont));
745 // frames array is a ClassFrameInfo[] array when only getting caller reference,
746 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
747 // be null.
748 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
749 objArrayHandle frames_array_h(THREAD, fa);
750
751 if (frames_array_h->length() < buffer_size) {
752 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
753 }
754
755 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
756 buffer_size, start_index, frames_array_h, CHECK_NULL);
757 return JNIHandles::make_local(THREAD, result);
758 JVM_END
759
760
761 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
762 jint last_batch_count, jint buffer_size, jint start_index,
763 jobjectArray frames))
764 // frames array is a ClassFrameInfo[] array when only getting caller reference,
765 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
766 // be null.
767 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
768 objArrayHandle frames_array_h(THREAD, fa);
769
770 if (frames_array_h->length() < buffer_size) {
771 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
772 }
773
774 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
775 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
776 start_index, frames_array_h, THREAD);
777 JVM_END
778
779 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
780 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
781 objArrayHandle frames_array_h(THREAD, fa);
782 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
783 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
784
785 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
786 JVM_END
787
788 // java.lang.Object ///////////////////////////////////////////////
789
790
791 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
792 // as implemented in the classic virtual machine; return 0 if object is null
793 if (handle == nullptr) {
794 return 0;
795 }
796 oop obj = JNIHandles::resolve_non_null(handle);
797 if (EnableValhalla && obj->klass()->is_inline_klass()) {
798 JavaValue result(T_INT);
799 JavaCallArguments args;
800 Handle ho(THREAD, obj);
801 args.push_oop(ho);
802 methodHandle method(THREAD, Universe::value_object_hash_code_method());
803 JavaCalls::call(&result, method, &args, THREAD);
804 if (HAS_PENDING_EXCEPTION) {
805 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
806 Handle e(THREAD, PENDING_EXCEPTION);
807 CLEAR_PENDING_EXCEPTION;
808 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
809 }
810 }
811 return result.get_jint();
812 } else {
813 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
814 }
815 JVM_END
816
817
818 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
819 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
820 ObjectSynchronizer::wait(obj, ms, CHECK);
821 JVM_END
822
823
824 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
825 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
826 ObjectSynchronizer::notify(obj, CHECK);
827 JVM_END
828
829
830 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
831 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
832 ObjectSynchronizer::notifyall(obj, CHECK);
833 JVM_END
834
835
836 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
837 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
838 Klass* klass = obj->klass();
839 JvmtiVMObjectAllocEventCollector oam;
840
841 #ifdef ASSERT
842 // Just checking that the cloneable flag is set correct
843 if (obj->is_array()) {
844 guarantee(klass->is_cloneable(), "all arrays are cloneable");
845 } else {
846 guarantee(obj->is_instance(), "should be instanceOop");
847 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
848 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
849 }
850 #endif
851
852 // Check if class of obj supports the Cloneable interface.
853 // All arrays are considered to be cloneable (See JLS 20.1.5).
854 // All j.l.r.Reference classes are considered non-cloneable.
855 if (!klass->is_cloneable() ||
856 (klass->is_instance_klass() &&
857 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
858 ResourceMark rm(THREAD);
859 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
860 }
861
862 if (klass->is_inline_klass()) {
863 // Value instances have no identity, so return the current instance instead of allocating a new one
864 // Value classes cannot have finalizers, so the method can return immediately
865 return JNIHandles::make_local(THREAD, obj());
866 }
867
868 // Make shallow object copy
869 const size_t size = obj->size();
870 oop new_obj_oop = nullptr;
871 if (obj->is_array()) {
872 const int length = ((arrayOop)obj())->length();
873 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
874 /* do_zero */ true, CHECK_NULL);
875 } else {
876 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
877 }
878
879 HeapAccess<>::clone(obj(), new_obj_oop, size);
880
881 Handle new_obj(THREAD, new_obj_oop);
882 // Caution: this involves a java upcall, so the clone should be
883 // "gc-robust" by this stage.
884 if (klass->has_finalizer()) {
885 assert(obj->is_instance(), "should be instanceOop");
886 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
887 new_obj = Handle(THREAD, new_obj_oop);
888 }
889
890 return JNIHandles::make_local(THREAD, new_obj());
891 JVM_END
892
893 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
894
895 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
896 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
897 JVM_END
898
899 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
900 return InstanceKlass::is_finalization_enabled();
901 JVM_END
902
903 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
904
905 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
906 CONT_RegisterNativeMethods(env, cls);
907 JVM_END
908
909 // java.io.File ///////////////////////////////////////////////////////////////
910
911 JVM_LEAF(char*, JVM_NativePath(char* path))
912 return os::native_path(path);
913 JVM_END
914
915
916 // Misc. class handling ///////////////////////////////////////////////////////////
917
918
919 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
920 // Getting the class of the caller frame.
921 //
922 // The call stack at this point looks something like this:
923 //
924 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
925 // [1] [ @CallerSensitive API.method ]
926 // [.] [ (skipped intermediate frames) ]
927 // [n] [ caller ]
928 vframeStream vfst(thread);
929 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
930 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
931 Method* m = vfst.method();
932 assert(m != nullptr, "sanity");
933 switch (n) {
934 case 0:
935 // This must only be called from Reflection.getCallerClass
936 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
937 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
938 }
939 // fall-through
940 case 1:
941 // Frame 0 and 1 must be caller sensitive.
942 if (!m->caller_sensitive()) {
943 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
944 }
945 break;
946 default:
947 if (!m->is_ignored_by_security_stack_walk()) {
948 // We have reached the desired frame; return the holder class.
949 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
950 }
951 break;
952 }
953 }
954 return nullptr;
955 JVM_END
956
957
958 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
959 oop mirror = nullptr;
960 BasicType t = name2type(utf);
961 if (t != T_ILLEGAL && !is_reference_type(t)) {
962 mirror = Universe::java_mirror(t);
963 }
964 if (mirror == nullptr) {
965 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
966 } else {
967 return (jclass) JNIHandles::make_local(THREAD, mirror);
968 }
969 JVM_END
970
971
972 // Returns a class loaded by the bootstrap class loader; or null
973 // if not found. ClassNotFoundException is not thrown.
974 // FindClassFromBootLoader is exported to the launcher for windows.
975 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
976 const char* name))
977 // Java libraries should ensure that name is never null or illegal.
978 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
979 // It's impossible to create this class; the name cannot fit
980 // into the constant pool.
981 return nullptr;
982 }
983 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
984
985 TempNewSymbol h_name = SymbolTable::new_symbol(name);
986 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
987 if (k == nullptr) {
988 return nullptr;
989 }
990
991 if (log_is_enabled(Debug, class, resolve)) {
992 trace_class_resolution(k);
993 }
994 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
995 JVM_END
996
997 // Find a class with this name in this loader, using the caller's protection domain.
998 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
999 jboolean init, jobject loader,
1000 jclass caller))
1001 TempNewSymbol h_name =
1002 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1003 CHECK_NULL);
1004
1005 oop loader_oop = JNIHandles::resolve(loader);
1006 oop from_class = JNIHandles::resolve(caller);
1007 Handle h_loader(THREAD, loader_oop);
1008
1009 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1010 false, THREAD);
1011
1012 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1013 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1014 }
1015 return result;
1016 JVM_END
1017
1018 // Currently only called from the old verifier.
1019 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1020 jboolean init, jclass from))
1021 TempNewSymbol h_name =
1022 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1023 CHECK_NULL);
1024 oop from_class_oop = JNIHandles::resolve(from);
1025 Klass* from_class = (from_class_oop == nullptr)
1026 ? (Klass*)nullptr
1027 : java_lang_Class::as_Klass(from_class_oop);
1028 oop class_loader = nullptr;
1029 if (from_class != nullptr) {
1030 class_loader = from_class->class_loader();
1031 }
1032 Handle h_loader(THREAD, class_loader);
1033 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1034
1035 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1036 // this function is generally only used for class loading during verification.
1037 ResourceMark rm;
1038 oop from_mirror = JNIHandles::resolve_non_null(from);
1039 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
1040 const char * from_name = from_class->external_name();
1041
1042 oop mirror = JNIHandles::resolve_non_null(result);
1043 Klass* to_class = java_lang_Class::as_Klass(mirror);
1044 const char * to = to_class->external_name();
1045 log_debug(class, resolve)("%s %s (verification)", from_name, to);
1046 }
1047
1048 return result;
1049 JVM_END
1050
1051 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1052 static jclass jvm_define_class_common(const char *name,
1053 jobject loader, const jbyte *buf,
1054 jsize len, jobject pd, const char *source,
1055 TRAPS) {
1056 if (source == nullptr) source = "__JVM_DefineClass__";
1057
1058 JavaThread* jt = THREAD;
1059
1060 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1061 ClassLoader::perf_define_appclass_selftime(),
1062 ClassLoader::perf_define_appclasses(),
1063 jt->get_thread_stat()->perf_recursion_counts_addr(),
1064 jt->get_thread_stat()->perf_timers_addr(),
1065 PerfClassTraceTime::DEFINE_CLASS);
1066
1067 if (UsePerfData) {
1068 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1069 }
1070
1071 // Class resolution will get the class name from the .class stream if the name is null.
1072 TempNewSymbol class_name = name == nullptr ? nullptr :
1073 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1074 CHECK_NULL);
1075
1076 ResourceMark rm(THREAD);
1077 ClassFileStream st((u1*)buf, len, source);
1078 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1079 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1080 ClassLoadInfo cl_info(protection_domain);
1081 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1082 class_loader,
1083 cl_info,
1084 CHECK_NULL);
1085
1086 if (log_is_enabled(Debug, class, resolve)) {
1087 trace_class_resolution(k);
1088 }
1089
1090 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1091 }
1092
1093 enum {
1094 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1095 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1096 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1097 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1098 };
1099
1100 /*
1101 * Define a class with the specified flags that indicates if it's a nestmate,
1102 * hidden, or strongly referenced from class loader.
1103 */
1104 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1105 const jbyte *buf, jsize len, jobject pd,
1106 jboolean init, int flags, jobject classData, TRAPS) {
1107 ResourceMark rm(THREAD);
1108
1109 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
1110 // Lookup class must be a non-null instance
1111 if (lookup_k == nullptr) {
1112 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1113 }
1114 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
1115
1116 Handle class_loader (THREAD, lookup_k->class_loader());
1117
1118 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1119 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1120 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1121 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1122
1123 InstanceKlass* host_class = nullptr;
1124 if (is_nestmate) {
1125 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1126 }
1127
1128 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1129 name,
1130 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1131 is_nestmate ? host_class->external_name() : "",
1132 is_hidden ? "hidden" : "not hidden",
1133 is_strong ? "strong" : "weak",
1134 vm_annotations ? "with vm annotations" : "without vm annotation");
1135
1136 if (!is_hidden) {
1137 // classData is only applicable for hidden classes
1138 if (classData != nullptr) {
1139 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1140 }
1141 if (is_nestmate) {
1142 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1143 }
1144 if (!is_strong) {
1145 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1146 }
1147 if (vm_annotations) {
1148 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1149 }
1150 if (flags != STRONG_LOADER_LINK) {
1151 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1152 err_msg("invalid flag 0x%x", flags));
1153 }
1154 }
1155
1156 // Class resolution will get the class name from the .class stream if the name is null.
1157 TempNewSymbol class_name = name == nullptr ? nullptr :
1158 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1159 CHECK_NULL);
1160
1161 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1162 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1163 ClassFileStream st((u1*)buf, len, source);
1164
1165 InstanceKlass* ik = nullptr;
1166 if (!is_hidden) {
1167 ClassLoadInfo cl_info(protection_domain);
1168 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1169 class_loader,
1170 cl_info,
1171 CHECK_NULL);
1172
1173 if (log_is_enabled(Debug, class, resolve)) {
1174 trace_class_resolution(ik);
1175 }
1176 } else { // hidden
1177 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1178 ClassLoadInfo cl_info(protection_domain,
1179 host_class,
1180 classData_h,
1181 is_hidden,
1182 is_strong,
1183 vm_annotations);
1184 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1185 class_loader,
1186 cl_info,
1187 CHECK_NULL);
1188
1189 // The hidden class loader data has been artificially been kept alive to
1190 // this point. The mirror and any instances of this class have to keep
1191 // it alive afterwards.
1192 ik->class_loader_data()->dec_keep_alive_ref_count();
1193
1194 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1195 ModuleEntry* module = ik->module();
1196 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1197 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1198 module_name,
1199 ik->external_name(),
1200 host_class->external_name(),
1201 ik->is_hidden() ? "is hidden" : "is not hidden");
1202 }
1203 }
1204
1205 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1206 // non-hidden class or nestmate class must be in the same package as the Lookup class
1207 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1208 }
1209
1210 if (init) {
1211 ik->initialize(CHECK_NULL);
1212 } else {
1213 ik->link_class(CHECK_NULL);
1214 }
1215
1216 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1217 }
1218
1219 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1220 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1221 JVM_END
1222
1223 /*
1224 * Define a class with the specified lookup class.
1225 * lookup: Lookup class
1226 * name: the name of the class
1227 * buf: class bytes
1228 * len: length of class bytes
1229 * pd: protection domain
1230 * init: initialize the class
1231 * flags: properties of the class
1232 * classData: private static pre-initialized field
1233 */
1234 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1235 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1236
1237 if (lookup == nullptr) {
1238 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1239 }
1240
1241 assert(buf != nullptr, "buf must not be null");
1242
1243 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1244 JVM_END
1245
1246 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1247
1248 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1249 JVM_END
1250
1251 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1252 ResourceMark rm(THREAD);
1253
1254 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1255 char* str = java_lang_String::as_utf8_string(h_name());
1256
1257 // Sanity check, don't expect null
1258 if (str == nullptr) return nullptr;
1259
1260 // Internalize the string, converting '.' to '/' in string.
1261 char* p = (char*)str;
1262 while (*p != '\0') {
1263 if (*p == '.') {
1264 *p = '/';
1265 }
1266 p++;
1267 }
1268
1269 const int str_len = (int)(p - str);
1270 if (str_len > Symbol::max_length()) {
1271 // It's impossible to create this class; the name cannot fit
1272 // into the constant pool.
1273 return nullptr;
1274 }
1275 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1276
1277 // Security Note:
1278 // The Java level wrapper will perform the necessary security check allowing
1279 // us to pass the null as the initiating class loader.
1280 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1281 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1282 #if INCLUDE_CDS
1283 if (k == nullptr) {
1284 // If the class is not already loaded, try to see if it's in the shared
1285 // archive for the current classloader (h_loader).
1286 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1287 }
1288 #endif
1289 return (k == nullptr) ? nullptr :
1290 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1291 JVM_END
1292
1293 // Module support //////////////////////////////////////////////////////////////////////////////
1294
1295 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1296 jstring location, jobjectArray packages))
1297 Handle h_module (THREAD, JNIHandles::resolve(module));
1298 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1299 JVM_END
1300
1301 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1302 Handle h_module (THREAD, JNIHandles::resolve(module));
1303 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1304 JVM_END
1305
1306 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1307 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1308 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1309 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1310 JVM_END
1311
1312 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1313 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1314 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1315 JVM_END
1316
1317 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1318 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1319 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1320 JVM_END
1321
1322 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1323 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1324 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1325 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1326 JVM_END
1327
1328 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1329 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1330 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1331 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1332 JVM_END
1333
1334 // Reflection support //////////////////////////////////////////////////////////////////////////////
1335
1336 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1337 assert (cls != nullptr, "illegal class");
1338 JvmtiVMObjectAllocEventCollector oam;
1339 ResourceMark rm(THREAD);
1340 HandleMark hm(THREAD);
1341 Handle java_class(THREAD, JNIHandles::resolve(cls));
1342 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1343 return (jstring) JNIHandles::make_local(THREAD, result);
1344 JVM_END
1345
1346
1347 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1348 JvmtiVMObjectAllocEventCollector oam;
1349 oop mirror = JNIHandles::resolve_non_null(cls);
1350
1351 // Special handling for primitive objects
1352 if (java_lang_Class::is_primitive(mirror)) {
1353 // Primitive objects does not have any interfaces
1354 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1355 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1356 }
1357
1358 Klass* klass = java_lang_Class::as_Klass(mirror);
1359 // Figure size of result array
1360 int size;
1361 if (klass->is_instance_klass()) {
1362 InstanceKlass* ik = InstanceKlass::cast(klass);
1363 size = ik->local_interfaces()->length();
1364 } else {
1365 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1366 size = 2;
1367 }
1368
1369 // Allocate result array
1370 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1371 objArrayHandle result (THREAD, r);
1372 // Fill in result
1373 if (klass->is_instance_klass()) {
1374 // Regular instance klass, fill in all local interfaces
1375 for (int index = 0; index < size; index++) {
1376 InstanceKlass* ik = InstanceKlass::cast(klass);
1377 Klass* k = ik->local_interfaces()->at(index);
1378 result->obj_at_put(index, k->java_mirror());
1379 }
1380 } else {
1381 // All arrays implement java.lang.Cloneable and java.io.Serializable
1382 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1383 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1384 }
1385 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1386 JVM_END
1387
1388
1389 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1390 oop mirror = JNIHandles::resolve_non_null(cls);
1391 if (java_lang_Class::is_primitive(mirror)) {
1392 return JNI_FALSE;
1393 }
1394 Klass* k = java_lang_Class::as_Klass(mirror);
1395 return k->is_hidden();
1396 JVM_END
1397
1398 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls))
1399 oop mirror = JNIHandles::resolve_non_null(cls);
1400 if (java_lang_Class::is_primitive(mirror)) {
1401 return JNI_FALSE;
1402 }
1403 Klass* k = java_lang_Class::as_Klass(mirror);
1404 if (EnableValhalla) {
1405 return k->is_array_klass() || k->is_identity_class();
1406 } else {
1407 return k->is_interface() ? JNI_FALSE : JNI_TRUE;
1408 }
1409 JVM_END
1410
1411 class ScopedValueBindingsResolver {
1412 public:
1413 InstanceKlass* Carrier_klass;
1414 ScopedValueBindingsResolver(JavaThread* THREAD) {
1415 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1416 Carrier_klass = InstanceKlass::cast(k);
1417 }
1418 };
1419
1420 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1421 ResourceMark rm(THREAD);
1422 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1423 JvmtiVMObjectAllocEventCollector oam;
1424
1425 static ScopedValueBindingsResolver resolver(THREAD);
1426
1427 // Iterate through Java frames
1428 vframeStream vfst(thread);
1429 for(; !vfst.at_end(); vfst.next()) {
1430 int loc = -1;
1431 // get method of frame
1432 Method* method = vfst.method();
1433
1434 Symbol *name = method->name();
1435
1436 InstanceKlass* holder = method->method_holder();
1437 if (name == vmSymbols::runWith_method_name()) {
1438 if (holder == vmClasses::Thread_klass()
1439 || holder == resolver.Carrier_klass) {
1440 loc = 1;
1441 }
1442 }
1443
1444 if (loc != -1) {
1445 javaVFrame *frame = vfst.asJavaVFrame();
1446 StackValueCollection* locals = frame->locals();
1447 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1448 Handle result = head_sv->get_obj();
1449 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1450 if (result() != nullptr) {
1451 return JNIHandles::make_local(THREAD, result());
1452 }
1453 }
1454 }
1455
1456 return nullptr;
1457 JVM_END
1458
1459 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1460 JvmtiVMObjectAllocEventCollector oam;
1461 // ofClass is a reference to a java_lang_Class object. The mirror object
1462 // of an InstanceKlass
1463 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1464 if (java_lang_Class::is_primitive(ofMirror) ||
1465 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1466 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1467 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1468 }
1469
1470 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1471 InnerClassesIterator iter(k);
1472
1473 if (iter.length() == 0) {
1474 // Neither an inner nor outer class
1475 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1476 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1477 }
1478
1479 // find inner class info
1480 constantPoolHandle cp(thread, k->constants());
1481 int length = iter.length();
1482
1483 // Allocate temp. result array
1484 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1485 objArrayHandle result (THREAD, r);
1486 int members = 0;
1487
1488 for (; !iter.done(); iter.next()) {
1489 int ioff = iter.inner_class_info_index();
1490 int ooff = iter.outer_class_info_index();
1491
1492 if (ioff != 0 && ooff != 0) {
1493 // Check to see if the name matches the class we're looking for
1494 // before attempting to find the class.
1495 if (cp->klass_name_at_matches(k, ooff)) {
1496 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1497 if (outer_klass == k) {
1498 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1499 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1500
1501 // Throws an exception if outer klass has not declared k as
1502 // an inner klass
1503 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1504
1505 result->obj_at_put(members, inner_klass->java_mirror());
1506 members++;
1507 }
1508 }
1509 }
1510 }
1511
1512 if (members != length) {
1513 // Return array of right length
1514 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1515 for(int i = 0; i < members; i++) {
1516 res->obj_at_put(i, result->obj_at(i));
1517 }
1518 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1519 }
1520
1521 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1522 JVM_END
1523
1524
1525 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1526 {
1527 // ofClass is a reference to a java_lang_Class object.
1528 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1529 if (java_lang_Class::is_primitive(ofMirror)) {
1530 return nullptr;
1531 }
1532 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1533 if (!klass->is_instance_klass()) {
1534 return nullptr;
1535 }
1536
1537 bool inner_is_member = false;
1538 Klass* outer_klass
1539 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1540 if (outer_klass == nullptr) return nullptr; // already a top-level class
1541 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1542 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1543 }
1544 JVM_END
1545
1546 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1547 {
1548 oop mirror = JNIHandles::resolve_non_null(cls);
1549 if (java_lang_Class::is_primitive(mirror)) {
1550 return nullptr;
1551 }
1552 Klass* klass = java_lang_Class::as_Klass(mirror);
1553 if (!klass->is_instance_klass()) {
1554 return nullptr;
1555 }
1556 InstanceKlass* k = InstanceKlass::cast(klass);
1557 int ooff = 0, noff = 0;
1558 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1559 if (noff != 0) {
1560 constantPoolHandle i_cp(thread, k->constants());
1561 Symbol* name = i_cp->symbol_at(noff);
1562 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1563 return (jstring) JNIHandles::make_local(THREAD, str());
1564 }
1565 }
1566 return nullptr;
1567 }
1568 JVM_END
1569
1570 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1571 assert (cls != nullptr, "illegal class");
1572 JvmtiVMObjectAllocEventCollector oam;
1573 ResourceMark rm(THREAD);
1574 oop mirror = JNIHandles::resolve_non_null(cls);
1575 // Return null for arrays and primitives
1576 if (!java_lang_Class::is_primitive(mirror)) {
1577 Klass* k = java_lang_Class::as_Klass(mirror);
1578 if (k->is_instance_klass()) {
1579 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1580 if (sym == nullptr) return nullptr;
1581 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1582 return (jstring) JNIHandles::make_local(THREAD, str());
1583 }
1584 }
1585 return nullptr;
1586 JVM_END
1587
1588
1589 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1590 assert (cls != nullptr, "illegal class");
1591 oop mirror = JNIHandles::resolve_non_null(cls);
1592 // Return null for arrays and primitives
1593 if (!java_lang_Class::is_primitive(mirror)) {
1594 Klass* k = java_lang_Class::as_Klass(mirror);
1595 if (k->is_instance_klass()) {
1596 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1597 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1598 }
1599 }
1600 return nullptr;
1601 JVM_END
1602
1603
1604 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1605 // some of this code was adapted from from jni_FromReflectedField
1606
1607 oop reflected = JNIHandles::resolve_non_null(field);
1608 oop mirror = java_lang_reflect_Field::clazz(reflected);
1609 Klass* k = java_lang_Class::as_Klass(mirror);
1610 int slot = java_lang_reflect_Field::slot(reflected);
1611 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1612
1613 InstanceKlass* ik = InstanceKlass::cast(k);
1614 int offset = ik->field_offset(slot);
1615
1616 if (modifiers & JVM_ACC_STATIC) {
1617 // for static fields we only look in the current class
1618 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1619 assert(false, "cannot find static field");
1620 return false;
1621 }
1622 } else {
1623 // for instance fields we start with the current class and work
1624 // our way up through the superclass chain
1625 if (!ik->find_field_from_offset(offset, false, &fd)) {
1626 assert(false, "cannot find instance field");
1627 return false;
1628 }
1629 }
1630 return true;
1631 }
1632
1633 static Method* jvm_get_method_common(jobject method) {
1634 // some of this code was adapted from from jni_FromReflectedMethod
1635
1636 oop reflected = JNIHandles::resolve_non_null(method);
1637 oop mirror = nullptr;
1638 int slot = 0;
1639
1640 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1641 mirror = java_lang_reflect_Constructor::clazz(reflected);
1642 slot = java_lang_reflect_Constructor::slot(reflected);
1643 } else {
1644 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1645 "wrong type");
1646 mirror = java_lang_reflect_Method::clazz(reflected);
1647 slot = java_lang_reflect_Method::slot(reflected);
1648 }
1649 Klass* k = java_lang_Class::as_Klass(mirror);
1650
1651 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1652 assert(m != nullptr, "cannot find method");
1653 return m; // caller has to deal with null in product mode
1654 }
1655
1656 /* Type use annotations support (JDK 1.8) */
1657
1658 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1659 assert (cls != nullptr, "illegal class");
1660 ResourceMark rm(THREAD);
1661 // Return null for arrays and primitives
1662 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1664 if (k->is_instance_klass()) {
1665 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1666 if (type_annotations != nullptr) {
1667 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1668 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1669 }
1670 }
1671 }
1672 return nullptr;
1673 JVM_END
1674
1675 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1676 assert (method != nullptr, "illegal method");
1677 // method is a handle to a java.lang.reflect.Method object
1678 Method* m = jvm_get_method_common(method);
1679 if (m == nullptr) {
1680 return nullptr;
1681 }
1682
1683 AnnotationArray* type_annotations = m->type_annotations();
1684 if (type_annotations != nullptr) {
1685 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1686 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1687 }
1688
1689 return nullptr;
1690 JVM_END
1691
1692 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1693 assert (field != nullptr, "illegal field");
1694 fieldDescriptor fd;
1695 bool gotFd = jvm_get_field_common(field, fd);
1696 if (!gotFd) {
1697 return nullptr;
1698 }
1699
1700 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1701 JVM_END
1702
1703 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1704 if (!cp->is_within_bounds(index)) {
1705 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1706 }
1707 }
1708
1709 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1710 {
1711 // method is a handle to a java.lang.reflect.Method object
1712 Method* method_ptr = jvm_get_method_common(method);
1713 methodHandle mh (THREAD, method_ptr);
1714 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1715 const int num_params = mh->method_parameters_length();
1716
1717 if (num_params < 0) {
1718 // A -1 return value from method_parameters_length means there is no
1719 // parameter data. Return null to indicate this to the reflection
1720 // API.
1721 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1722 return (jobjectArray)nullptr;
1723 } else {
1724 // Otherwise, we return something up to reflection, even if it is
1725 // a zero-length array. Why? Because in some cases this can
1726 // trigger a MalformedParametersException.
1727
1728 // make sure all the symbols are properly formatted
1729 for (int i = 0; i < num_params; i++) {
1730 MethodParametersElement* params = mh->method_parameters_start();
1731 int index = params[i].name_cp_index;
1732 constantPoolHandle cp(THREAD, mh->constants());
1733 bounds_check(cp, index, CHECK_NULL);
1734
1735 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1736 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1737 "Wrong type at constant pool index");
1738 }
1739
1740 }
1741
1742 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1743 objArrayHandle result (THREAD, result_oop);
1744
1745 for (int i = 0; i < num_params; i++) {
1746 MethodParametersElement* params = mh->method_parameters_start();
1747 // For a 0 index, give a null symbol
1748 Symbol* sym = 0 != params[i].name_cp_index ?
1749 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1750 int flags = params[i].flags;
1751 oop param = Reflection::new_parameter(reflected_method, i, sym,
1752 flags, CHECK_NULL);
1753 result->obj_at_put(i, param);
1754 }
1755 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1756 }
1757 }
1758 JVM_END
1759
1760 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1761
1762 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1763 {
1764 JvmtiVMObjectAllocEventCollector oam;
1765
1766 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1767 // Exclude primitive types and array types
1768 if (java_lang_Class::is_primitive(ofMirror) ||
1769 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1770 // Return empty array
1771 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1772 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1773 }
1774
1775 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1776 constantPoolHandle cp(THREAD, k->constants());
1777
1778 // Ensure class is linked
1779 k->link_class(CHECK_NULL);
1780
1781 // Allocate result
1782 int num_fields;
1783
1784 if (publicOnly) {
1785 num_fields = 0;
1786 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1787 if (fs.access_flags().is_public()) ++num_fields;
1788 }
1789 } else {
1790 num_fields = k->java_fields_count();
1791 }
1792
1793 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1794 objArrayHandle result (THREAD, r);
1795
1796 int out_idx = 0;
1797 fieldDescriptor fd;
1798 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1799 if (!publicOnly || fs.access_flags().is_public()) {
1800 fd.reinitialize(k, fs.index());
1801 oop field = Reflection::new_field(&fd, CHECK_NULL);
1802 result->obj_at_put(out_idx, field);
1803 ++out_idx;
1804 }
1805 }
1806 assert(out_idx == num_fields, "just checking");
1807 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1808 }
1809 JVM_END
1810
1811 // A class is a record if and only if it is final and a direct subclass of
1812 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1813 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1814 {
1815 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1816 if (k != nullptr && k->is_instance_klass()) {
1817 InstanceKlass* ik = InstanceKlass::cast(k);
1818 return ik->is_record();
1819 } else {
1820 return false;
1821 }
1822 }
1823 JVM_END
1824
1825 // Returns an array containing the components of the Record attribute,
1826 // or null if the attribute is not present.
1827 //
1828 // Note that this function returns the components of the Record attribute
1829 // even if the class is not a record.
1830 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1831 {
1832 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1833 assert(c->is_instance_klass(), "must be");
1834 InstanceKlass* ik = InstanceKlass::cast(c);
1835
1836 Array<RecordComponent*>* components = ik->record_components();
1837 if (components != nullptr) {
1838 JvmtiVMObjectAllocEventCollector oam;
1839 constantPoolHandle cp(THREAD, ik->constants());
1840 int length = components->length();
1841 assert(length >= 0, "unexpected record_components length");
1842 objArrayOop record_components =
1843 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1844 objArrayHandle components_h (THREAD, record_components);
1845
1846 for (int x = 0; x < length; x++) {
1847 RecordComponent* component = components->at(x);
1848 assert(component != nullptr, "unexpected null record component");
1849 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1850 components_h->obj_at_put(x, component_oop);
1851 }
1852 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1853 }
1854
1855 return nullptr;
1856 }
1857 JVM_END
1858
1859 static jobjectArray get_class_declared_methods_helper(
1860 JNIEnv *env,
1861 jclass ofClass, jboolean publicOnly,
1862 bool want_constructor,
1863 Klass* klass, TRAPS) {
1864
1865 JvmtiVMObjectAllocEventCollector oam;
1866
1867 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1868 // Exclude primitive types and array types
1869 if (java_lang_Class::is_primitive(ofMirror)
1870 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1871 // Return empty array
1872 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1873 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1874 }
1875
1876 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1877
1878 // Ensure class is linked
1879 k->link_class(CHECK_NULL);
1880
1881 Array<Method*>* methods = k->methods();
1882 int methods_length = methods->length();
1883
1884 // Save original method_idnum in case of redefinition, which can change
1885 // the idnum of obsolete methods. The new method will have the same idnum
1886 // but if we refresh the methods array, the counts will be wrong.
1887 ResourceMark rm(THREAD);
1888 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1889 int num_methods = 0;
1890
1891 // Select methods matching the criteria.
1892 for (int i = 0; i < methods_length; i++) {
1893 Method* method = methods->at(i);
1894 if (want_constructor && !method->is_object_constructor()) {
1895 continue;
1896 }
1897 if (!want_constructor &&
1898 (method->is_object_constructor() || method->is_class_initializer() ||
1899 method->is_overpass())) {
1900 continue;
1901 }
1902 if (publicOnly && !method->is_public()) {
1903 continue;
1904 }
1905 idnums->push(method->method_idnum());
1906 ++num_methods;
1907 }
1908
1909 // Allocate result
1910 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1911 objArrayHandle result (THREAD, r);
1912
1913 // Now just put the methods that we selected above, but go by their idnum
1914 // in case of redefinition. The methods can be redefined at any safepoint,
1915 // so above when allocating the oop array and below when creating reflect
1916 // objects.
1917 for (int i = 0; i < num_methods; i++) {
1918 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1919 if (method.is_null()) {
1920 // Method may have been deleted and seems this API can handle null
1921 // Otherwise should probably put a method that throws NSME
1922 result->obj_at_put(i, nullptr);
1923 } else {
1924 oop m;
1925 if (want_constructor) {
1926 assert(method->is_object_constructor(), "must be");
1927 m = Reflection::new_constructor(method, CHECK_NULL);
1928 } else {
1929 m = Reflection::new_method(method, false, CHECK_NULL);
1930 }
1931 result->obj_at_put(i, m);
1932 }
1933 }
1934
1935 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1936 }
1937
1938 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1939 {
1940 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1941 /*want_constructor*/ false,
1942 vmClasses::reflect_Method_klass(), THREAD);
1943 }
1944 JVM_END
1945
1946 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1947 {
1948 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1949 /*want_constructor*/ true,
1950 vmClasses::reflect_Constructor_klass(), THREAD);
1951 }
1952 JVM_END
1953
1954 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1955 {
1956 oop mirror = JNIHandles::resolve_non_null(cls);
1957 if (java_lang_Class::is_primitive(mirror)) {
1958 // Primitive type
1959 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1960 }
1961
1962 Klass* k = java_lang_Class::as_Klass(mirror);
1963 return k->access_flags().as_class_flags();
1964 }
1965 JVM_END
1966
1967 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1968 {
1969 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1970 assert(c->is_instance_klass(), "must be");
1971 InstanceKlass* ck = InstanceKlass::cast(c);
1972 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1973 assert(m->is_instance_klass(), "must be");
1974 InstanceKlass* mk = InstanceKlass::cast(m);
1975 return ck->has_nestmate_access_to(mk, THREAD);
1976 }
1977 JVM_END
1978
1979 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1980 {
1981 // current is not a primitive or array class
1982 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1983 assert(c->is_instance_klass(), "must be");
1984 InstanceKlass* ck = InstanceKlass::cast(c);
1985 InstanceKlass* host = ck->nest_host(THREAD);
1986 return (jclass) (host == nullptr ? nullptr :
1987 JNIHandles::make_local(THREAD, host->java_mirror()));
1988 }
1989 JVM_END
1990
1991 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1992 {
1993 // current is not a primitive or array class
1994 ResourceMark rm(THREAD);
1995 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1996 assert(c->is_instance_klass(), "must be");
1997 InstanceKlass* ck = InstanceKlass::cast(c);
1998 InstanceKlass* host = ck->nest_host(THREAD);
1999
2000 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2001 ck->external_name(), host->external_name());
2002 {
2003 JvmtiVMObjectAllocEventCollector oam;
2004 Array<u2>* members = host->nest_members();
2005 int length = members == nullptr ? 0 : members->length();
2006
2007 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2008
2009 // nest host is first in the array so make it one bigger
2010 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2011 length + 1, CHECK_NULL);
2012 objArrayHandle result(THREAD, r);
2013 result->obj_at_put(0, host->java_mirror());
2014 if (length != 0) {
2015 int count = 0;
2016 for (int i = 0; i < length; i++) {
2017 int cp_index = members->at(i);
2018 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2019 if (HAS_PENDING_EXCEPTION) {
2020 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2021 return nullptr; // propagate VMEs
2022 }
2023 if (log_is_enabled(Trace, class, nestmates)) {
2024 stringStream ss;
2025 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2026 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2027 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2028 log_trace(class, nestmates)("%s", ss.as_string());
2029 }
2030 CLEAR_PENDING_EXCEPTION;
2031 continue;
2032 }
2033 if (k->is_instance_klass()) {
2034 InstanceKlass* ik = InstanceKlass::cast(k);
2035 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2036 if (nest_host_k == host) {
2037 result->obj_at_put(count+1, k->java_mirror());
2038 count++;
2039 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2040 } else {
2041 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2042 ik->external_name(), nest_host_k->external_name());
2043 }
2044 } else {
2045 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2046 k->external_name());
2047 }
2048 }
2049 if (count < length) {
2050 // we had invalid entries so we need to compact the array
2051 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2052 length + 1, count + 1);
2053
2054 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2055 count + 1, CHECK_NULL);
2056 objArrayHandle result2(THREAD, r2);
2057 for (int i = 0; i < count + 1; i++) {
2058 result2->obj_at_put(i, result->obj_at(i));
2059 }
2060 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2061 }
2062 }
2063 else {
2064 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2065 }
2066 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2067 }
2068 }
2069 JVM_END
2070
2071 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2072 {
2073 oop mirror = JNIHandles::resolve_non_null(current);
2074 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2075 Klass* c = java_lang_Class::as_Klass(mirror);
2076 assert(c->is_instance_klass(), "must be");
2077 InstanceKlass* ik = InstanceKlass::cast(c);
2078 ResourceMark rm(THREAD);
2079 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2080 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2081 if (ik->is_sealed()) {
2082 JvmtiVMObjectAllocEventCollector oam;
2083 Array<u2>* subclasses = ik->permitted_subclasses();
2084 int length = subclasses->length();
2085
2086 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2087
2088 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2089 length, CHECK_NULL);
2090 objArrayHandle result(THREAD, r);
2091 int count = 0;
2092 for (int i = 0; i < length; i++) {
2093 int cp_index = subclasses->at(i);
2094 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2095 if (HAS_PENDING_EXCEPTION) {
2096 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2097 return nullptr; // propagate VMEs
2098 }
2099 if (log_is_enabled(Trace, class, sealed)) {
2100 stringStream ss;
2101 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2102 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2103 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2104 log_trace(class, sealed)("%s", ss.as_string());
2105 }
2106
2107 CLEAR_PENDING_EXCEPTION;
2108 continue;
2109 }
2110 if (k->is_instance_klass()) {
2111 result->obj_at_put(count++, k->java_mirror());
2112 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2113 }
2114 }
2115 if (count < length) {
2116 // we had invalid entries so we need to compact the array
2117 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2118 count, CHECK_NULL);
2119 objArrayHandle result2(THREAD, r2);
2120 for (int i = 0; i < count; i++) {
2121 result2->obj_at_put(i, result->obj_at(i));
2122 }
2123 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2124 }
2125 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2126 } else {
2127 return nullptr;
2128 }
2129 }
2130 JVM_END
2131
2132 // Constant pool access //////////////////////////////////////////////////////////
2133
2134 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2135 {
2136 JvmtiVMObjectAllocEventCollector oam;
2137 oop mirror = JNIHandles::resolve_non_null(cls);
2138 // Return null for primitives and arrays
2139 if (!java_lang_Class::is_primitive(mirror)) {
2140 Klass* k = java_lang_Class::as_Klass(mirror);
2141 if (k->is_instance_klass()) {
2142 InstanceKlass* k_h = InstanceKlass::cast(k);
2143 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2144 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2145 return JNIHandles::make_local(THREAD, jcp());
2146 }
2147 }
2148 return nullptr;
2149 }
2150 JVM_END
2151
2152
2153 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2154 {
2155 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2156 return cp->length();
2157 }
2158 JVM_END
2159
2160
2161 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2162 {
2163 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2164 bounds_check(cp, index, CHECK_NULL);
2165 constantTag tag = cp->tag_at(index);
2166 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2167 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2168 }
2169 Klass* k = cp->klass_at(index, CHECK_NULL);
2170 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2171 }
2172 JVM_END
2173
2174 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2175 {
2176 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2177 bounds_check(cp, index, CHECK_NULL);
2178 constantTag tag = cp->tag_at(index);
2179 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2180 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2181 }
2182 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2183 if (k == nullptr) return nullptr;
2184 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2185 }
2186 JVM_END
2187
2188 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2189 constantTag tag = cp->tag_at(index);
2190 if (!tag.is_method() && !tag.is_interface_method()) {
2191 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2192 }
2193 int klass_ref = cp->uncached_klass_ref_index_at(index);
2194 Klass* k_o;
2195 if (force_resolution) {
2196 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2197 } else {
2198 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2199 if (k_o == nullptr) return nullptr;
2200 }
2201 InstanceKlass* k = InstanceKlass::cast(k_o);
2202 Symbol* name = cp->uncached_name_ref_at(index);
2203 Symbol* sig = cp->uncached_signature_ref_at(index);
2204 methodHandle m (THREAD, k->find_method(name, sig));
2205 if (m.is_null()) {
2206 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2207 }
2208 oop method;
2209 if (m->is_object_constructor()) {
2210 method = Reflection::new_constructor(m, CHECK_NULL);
2211 } else {
2212 method = Reflection::new_method(m, true, CHECK_NULL);
2213 }
2214 return JNIHandles::make_local(THREAD, method);
2215 }
2216
2217 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2218 {
2219 JvmtiVMObjectAllocEventCollector oam;
2220 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2221 bounds_check(cp, index, CHECK_NULL);
2222 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2223 return res;
2224 }
2225 JVM_END
2226
2227 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2228 {
2229 JvmtiVMObjectAllocEventCollector oam;
2230 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2231 bounds_check(cp, index, CHECK_NULL);
2232 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2233 return res;
2234 }
2235 JVM_END
2236
2237 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2238 constantTag tag = cp->tag_at(index);
2239 if (!tag.is_field()) {
2240 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2241 }
2242 int klass_ref = cp->uncached_klass_ref_index_at(index);
2243 Klass* k_o;
2244 if (force_resolution) {
2245 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2246 } else {
2247 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2248 if (k_o == nullptr) return nullptr;
2249 }
2250 InstanceKlass* k = InstanceKlass::cast(k_o);
2251 Symbol* name = cp->uncached_name_ref_at(index);
2252 Symbol* sig = cp->uncached_signature_ref_at(index);
2253 fieldDescriptor fd;
2254 Klass* target_klass = k->find_field(name, sig, &fd);
2255 if (target_klass == nullptr) {
2256 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2257 }
2258 oop field = Reflection::new_field(&fd, CHECK_NULL);
2259 return JNIHandles::make_local(THREAD, field);
2260 }
2261
2262 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2263 {
2264 JvmtiVMObjectAllocEventCollector oam;
2265 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2266 bounds_check(cp, index, CHECK_NULL);
2267 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2268 return res;
2269 }
2270 JVM_END
2271
2272 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2273 {
2274 JvmtiVMObjectAllocEventCollector oam;
2275 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2276 bounds_check(cp, index, CHECK_NULL);
2277 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2278 return res;
2279 }
2280 JVM_END
2281
2282 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2283 {
2284 JvmtiVMObjectAllocEventCollector oam;
2285 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2286 bounds_check(cp, index, CHECK_NULL);
2287 constantTag tag = cp->tag_at(index);
2288 if (!tag.is_field_or_method()) {
2289 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2290 }
2291 int klass_ref = cp->uncached_klass_ref_index_at(index);
2292 Symbol* klass_name = cp->klass_name_at(klass_ref);
2293 Symbol* member_name = cp->uncached_name_ref_at(index);
2294 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2295 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2296 objArrayHandle dest(THREAD, dest_o);
2297 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2298 dest->obj_at_put(0, str());
2299 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2300 dest->obj_at_put(1, str());
2301 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2302 dest->obj_at_put(2, str());
2303 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2304 }
2305 JVM_END
2306
2307 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2308 {
2309 JvmtiVMObjectAllocEventCollector oam;
2310 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2311 bounds_check(cp, index, CHECK_0);
2312 constantTag tag = cp->tag_at(index);
2313 if (!tag.is_field_or_method()) {
2314 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2315 }
2316 return (jint) cp->uncached_klass_ref_index_at(index);
2317 }
2318 JVM_END
2319
2320 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2321 {
2322 JvmtiVMObjectAllocEventCollector oam;
2323 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2324 bounds_check(cp, index, CHECK_0);
2325 constantTag tag = cp->tag_at(index);
2326 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2327 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2328 }
2329 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2330 }
2331 JVM_END
2332
2333 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2334 {
2335 JvmtiVMObjectAllocEventCollector oam;
2336 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2337 bounds_check(cp, index, CHECK_NULL);
2338 constantTag tag = cp->tag_at(index);
2339 if (!tag.is_name_and_type()) {
2340 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2341 }
2342 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2343 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2344 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2345 objArrayHandle dest(THREAD, dest_o);
2346 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2347 dest->obj_at_put(0, str());
2348 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2349 dest->obj_at_put(1, str());
2350 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2351 }
2352 JVM_END
2353
2354 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2355 {
2356 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2357 bounds_check(cp, index, CHECK_0);
2358 constantTag tag = cp->tag_at(index);
2359 if (!tag.is_int()) {
2360 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2361 }
2362 return cp->int_at(index);
2363 }
2364 JVM_END
2365
2366 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2367 {
2368 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2369 bounds_check(cp, index, CHECK_(0L));
2370 constantTag tag = cp->tag_at(index);
2371 if (!tag.is_long()) {
2372 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2373 }
2374 return cp->long_at(index);
2375 }
2376 JVM_END
2377
2378 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2379 {
2380 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2381 bounds_check(cp, index, CHECK_(0.0f));
2382 constantTag tag = cp->tag_at(index);
2383 if (!tag.is_float()) {
2384 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2385 }
2386 return cp->float_at(index);
2387 }
2388 JVM_END
2389
2390 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2391 {
2392 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2393 bounds_check(cp, index, CHECK_(0.0));
2394 constantTag tag = cp->tag_at(index);
2395 if (!tag.is_double()) {
2396 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2397 }
2398 return cp->double_at(index);
2399 }
2400 JVM_END
2401
2402 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2403 {
2404 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2405 bounds_check(cp, index, CHECK_NULL);
2406 constantTag tag = cp->tag_at(index);
2407 if (!tag.is_string()) {
2408 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2409 }
2410 oop str = cp->string_at(index, CHECK_NULL);
2411 return (jstring) JNIHandles::make_local(THREAD, str);
2412 }
2413 JVM_END
2414
2415 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2416 {
2417 JvmtiVMObjectAllocEventCollector oam;
2418 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2419 bounds_check(cp, index, CHECK_NULL);
2420 constantTag tag = cp->tag_at(index);
2421 if (!tag.is_symbol()) {
2422 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2423 }
2424 Symbol* sym = cp->symbol_at(index);
2425 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2426 return (jstring) JNIHandles::make_local(THREAD, str());
2427 }
2428 JVM_END
2429
2430 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2431 {
2432 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2433 bounds_check(cp, index, CHECK_0);
2434 constantTag tag = cp->tag_at(index);
2435 jbyte result = tag.value();
2436 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2437 // they are changed to the corresponding tags from the JVM spec, so that java code in
2438 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2439 if (tag.is_klass_or_reference()) {
2440 result = JVM_CONSTANT_Class;
2441 } else if (tag.is_string_index()) {
2442 result = JVM_CONSTANT_String;
2443 } else if (tag.is_method_type_in_error()) {
2444 result = JVM_CONSTANT_MethodType;
2445 } else if (tag.is_method_handle_in_error()) {
2446 result = JVM_CONSTANT_MethodHandle;
2447 } else if (tag.is_dynamic_constant_in_error()) {
2448 result = JVM_CONSTANT_Dynamic;
2449 }
2450 return result;
2451 }
2452 JVM_END
2453
2454 // Assertion support. //////////////////////////////////////////////////////////
2455
2456 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2457 assert(cls != nullptr, "bad class");
2458
2459 oop r = JNIHandles::resolve(cls);
2460 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2461 if (java_lang_Class::is_primitive(r)) return false;
2462
2463 Klass* k = java_lang_Class::as_Klass(r);
2464 assert(k->is_instance_klass(), "must be an instance klass");
2465 if (!k->is_instance_klass()) return false;
2466
2467 ResourceMark rm(THREAD);
2468 const char* name = k->name()->as_C_string();
2469 bool system_class = k->class_loader() == nullptr;
2470 return JavaAssertions::enabled(name, system_class);
2471
2472 JVM_END
2473
2474
2475 // Return a new AssertionStatusDirectives object with the fields filled in with
2476 // command-line assertion arguments (i.e., -ea, -da).
2477 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2478 JvmtiVMObjectAllocEventCollector oam;
2479 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2480 return JNIHandles::make_local(THREAD, asd);
2481 JVM_END
2482
2483 // Arrays support /////////////////////////////////////////////////////////////
2484
2485 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2486 oop o = JNIHandles::resolve(array);
2487 Klass* k = o->klass();
2488 if ((o == nullptr) || (!k->is_array_klass())) {
2489 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2490 }
2491 return ArrayKlass::cast(k)->element_access_must_be_atomic();
2492 JVM_END
2493
2494 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2495 oop o = JNIHandles::resolve(array);
2496 Klass* k = o->klass();
2497 if ((o == nullptr) || (!k->is_array_klass())) {
2498 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2499 }
2500 if (k->is_flatArray_klass()) {
2501 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2502 if (!vk->element_access_must_be_atomic()) {
2503 /**
2504 * Need to decide how to implement:
2505 *
2506 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2507 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2508 * "checkcast" & "instanceof"
2509 *
2510 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2511 * possibly per instance lock structure. Said info, could be placed in
2512 * "trailer" rather than disturb the current arrayOop
2513 */
2514 Unimplemented();
2515 }
2516 }
2517 return array;
2518 JVM_END
2519
2520 // Verification ////////////////////////////////////////////////////////////////////////////////
2521
2522 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2523
2524 // RedefineClasses support: bug 6214132 caused verification to fail.
2525 // All functions from this section should call the jvmtiThreadSate function:
2526 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2527 // The function returns a Klass* of the _scratch_class if the verifier
2528 // was invoked in the middle of the class redefinition.
2529 // Otherwise it returns its argument value which is the _the_class Klass*.
2530 // Please, refer to the description in the jvmtiThreadState.hpp.
2531
2532 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2533 oop mirror = JNIHandles::resolve_non_null(cls);
2534 if (java_lang_Class::is_primitive(mirror)) {
2535 return JNI_FALSE;
2536 }
2537 Klass* k = java_lang_Class::as_Klass(mirror);
2538 // This isn't necessary since answer is the same since redefinition
2539 // has already checked this matches for the scratch class.
2540 // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2541 jboolean result = k->is_interface();
2542 assert(!result || k->is_instance_klass(),
2543 "all interfaces are instance types");
2544 return result;
2545 JVM_END
2546
2547
2548 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2550 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2551 return k->name()->as_utf8();
2552 JVM_END
2553
2554
2555 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2556 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2557 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2558 // types will have length zero if this is not an InstanceKlass
2559 // (length is determined by call to JVM_GetClassCPEntriesCount)
2560 if (k->is_instance_klass()) {
2561 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2562 for (int index = cp->length() - 1; index >= 0; index--) {
2563 constantTag tag = cp->tag_at(index);
2564 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2565 }
2566 }
2567 JVM_END
2568
2569
2570 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2574 JVM_END
2575
2576
2577 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2578 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2579 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2580 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2581 JVM_END
2582
2583
2584 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2586 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2587 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2588 JVM_END
2589
2590
2591 // The following methods, used for the verifier, are never called with
2592 // array klasses, so a direct cast to InstanceKlass is safe.
2593 // Typically, these methods are called in a loop with bounds determined
2594 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2595 // zero for arrays.
2596 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2600 int length = method->checked_exceptions_length();
2601 if (length > 0) {
2602 CheckedExceptionElement* table= method->checked_exceptions_start();
2603 for (int i = 0; i < length; i++) {
2604 exceptions[i] = table[i].class_cp_index;
2605 }
2606 }
2607 JVM_END
2608
2609
2610 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2614 return method->checked_exceptions_length();
2615 JVM_END
2616
2617
2618 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2619 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2620 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2621 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2622 memcpy(code, method->code_base(), method->code_size());
2623 JVM_END
2624
2625
2626 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2627 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2628 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2629 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2630 return method->code_size();
2631 JVM_END
2632
2633
2634 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2637 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2638 ExceptionTable extable(method);
2639 entry->start_pc = extable.start_pc(entry_index);
2640 entry->end_pc = extable.end_pc(entry_index);
2641 entry->handler_pc = extable.handler_pc(entry_index);
2642 entry->catchType = extable.catch_type_index(entry_index);
2643 JVM_END
2644
2645
2646 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2647 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2648 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2649 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2650 return method->exception_table_length();
2651 JVM_END
2652
2653
2654 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2656 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2657 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2658 return method->access_flags().as_method_flags();
2659 JVM_END
2660
2661
2662 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2664 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2665 return InstanceKlass::cast(k)->field_access_flags(field_index);
2666 JVM_END
2667
2668
2669 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2670 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2671 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2672 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2673 return method->max_locals();
2674 JVM_END
2675
2676
2677 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2678 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2679 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2680 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2681 return method->size_of_parameters();
2682 JVM_END
2683
2684
2685 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2686 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2687 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2688 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2689 return method->verifier_max_stack();
2690 JVM_END
2691
2692
2693 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2694 ResourceMark rm(THREAD);
2695 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2696 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2697 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2698 return method->is_object_constructor();
2699 JVM_END
2700
2701
2702 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2703 ResourceMark rm(THREAD);
2704 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2705 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2706 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2707 return method->is_overpass();
2708 JVM_END
2709
2710 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2711 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2712 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2713 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2714 return method->name()->as_utf8();
2715 JVM_END
2716
2717
2718 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2719 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2720 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2721 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2722 return method->signature()->as_utf8();
2723 JVM_END
2724
2725 /**
2726 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2727 * read entries in the constant pool. Since the old verifier always
2728 * works on a copy of the code, it will not see any rewriting that
2729 * may possibly occur in the middle of verification. So it is important
2730 * that nothing it calls tries to use the cpCache instead of the raw
2731 * constant pool, so we must use cp->uncached_x methods when appropriate.
2732 */
2733 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2734 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2735 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2736 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2737 switch (cp->tag_at(cp_index).value()) {
2738 case JVM_CONSTANT_Fieldref:
2739 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2740 default:
2741 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2742 }
2743 ShouldNotReachHere();
2744 return nullptr;
2745 JVM_END
2746
2747
2748 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2749 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2750 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2751 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2752 switch (cp->tag_at(cp_index).value()) {
2753 case JVM_CONSTANT_InterfaceMethodref:
2754 case JVM_CONSTANT_Methodref:
2755 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2756 default:
2757 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2758 }
2759 ShouldNotReachHere();
2760 return nullptr;
2761 JVM_END
2762
2763
2764 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2765 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2766 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2767 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2768 switch (cp->tag_at(cp_index).value()) {
2769 case JVM_CONSTANT_InterfaceMethodref:
2770 case JVM_CONSTANT_Methodref:
2771 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2772 default:
2773 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2774 }
2775 ShouldNotReachHere();
2776 return nullptr;
2777 JVM_END
2778
2779
2780 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2781 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2782 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2783 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2784 switch (cp->tag_at(cp_index).value()) {
2785 case JVM_CONSTANT_Fieldref:
2786 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2787 default:
2788 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2789 }
2790 ShouldNotReachHere();
2791 return nullptr;
2792 JVM_END
2793
2794
2795 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2796 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2797 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2798 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2799 Symbol* classname = cp->klass_name_at(cp_index);
2800 return classname->as_utf8();
2801 JVM_END
2802
2803
2804 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2805 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2806 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2807 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2808 switch (cp->tag_at(cp_index).value()) {
2809 case JVM_CONSTANT_Fieldref: {
2810 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2811 Symbol* classname = cp->klass_name_at(class_index);
2812 return classname->as_utf8();
2813 }
2814 default:
2815 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2816 }
2817 ShouldNotReachHere();
2818 return nullptr;
2819 JVM_END
2820
2821
2822 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2823 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2824 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2825 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2826 switch (cp->tag_at(cp_index).value()) {
2827 case JVM_CONSTANT_Methodref:
2828 case JVM_CONSTANT_InterfaceMethodref: {
2829 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2830 Symbol* classname = cp->klass_name_at(class_index);
2831 return classname->as_utf8();
2832 }
2833 default:
2834 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2835 }
2836 ShouldNotReachHere();
2837 return nullptr;
2838 JVM_END
2839
2840
2841 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2842 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2843 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2844 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2845 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2846 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2847 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2848 switch (cp->tag_at(cp_index).value()) {
2849 case JVM_CONSTANT_Fieldref: {
2850 Symbol* name = cp->uncached_name_ref_at(cp_index);
2851 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2852 InstanceKlass* ik = InstanceKlass::cast(k_called);
2853 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2854 if (fs.name() == name && fs.signature() == signature) {
2855 return fs.access_flags().as_field_flags();
2856 }
2857 }
2858 return -1;
2859 }
2860 default:
2861 fatal("JVM_GetCPFieldModifiers: illegal constant");
2862 }
2863 ShouldNotReachHere();
2864 return 0;
2865 JVM_END
2866
2867
2868 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2869 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2870 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2871 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2872 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2873 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2874 switch (cp->tag_at(cp_index).value()) {
2875 case JVM_CONSTANT_Methodref:
2876 case JVM_CONSTANT_InterfaceMethodref: {
2877 Symbol* name = cp->uncached_name_ref_at(cp_index);
2878 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2879 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2880 int methods_count = methods->length();
2881 for (int i = 0; i < methods_count; i++) {
2882 Method* method = methods->at(i);
2883 if (method->name() == name && method->signature() == signature) {
2884 return method->access_flags().as_method_flags();
2885 }
2886 }
2887 return -1;
2888 }
2889 default:
2890 fatal("JVM_GetCPMethodModifiers: illegal constant");
2891 }
2892 ShouldNotReachHere();
2893 return 0;
2894 JVM_END
2895
2896
2897 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2898
2899 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2900 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2901 JVM_END
2902
2903
2904 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2905 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2906 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2907 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2908 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2909 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2910 JVM_END
2911
2912 // Printing support //////////////////////////////////////////////////
2913 extern "C" {
2914
2915 ATTRIBUTE_PRINTF(3, 0)
2916 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2917 // Reject count values that are negative signed values converted to
2918 // unsigned; see bug 4399518, 4417214
2919 if ((intptr_t)count <= 0) return -1;
2920
2921 int result = os::vsnprintf(str, count, fmt, args);
2922 if (result > 0 && (size_t)result >= count) {
2923 result = -1;
2924 }
2925
2926 return result;
2927 }
2928
2929 ATTRIBUTE_PRINTF(3, 4)
2930 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2931 va_list args;
2932 int len;
2933 va_start(args, fmt);
2934 len = jio_vsnprintf(str, count, fmt, args);
2935 va_end(args);
2936 return len;
2937 }
2938
2939 ATTRIBUTE_PRINTF(2, 3)
2940 int jio_fprintf(FILE* f, const char *fmt, ...) {
2941 int len;
2942 va_list args;
2943 va_start(args, fmt);
2944 len = jio_vfprintf(f, fmt, args);
2945 va_end(args);
2946 return len;
2947 }
2948
2949 ATTRIBUTE_PRINTF(2, 0)
2950 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2951 if (Arguments::vfprintf_hook() != nullptr) {
2952 return Arguments::vfprintf_hook()(f, fmt, args);
2953 } else {
2954 return vfprintf(f, fmt, args);
2955 }
2956 }
2957
2958 ATTRIBUTE_PRINTF(1, 2)
2959 JNIEXPORT int jio_printf(const char *fmt, ...) {
2960 int len;
2961 va_list args;
2962 va_start(args, fmt);
2963 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2964 va_end(args);
2965 return len;
2966 }
2967
2968 // HotSpot specific jio method
2969 void jio_print(const char* s, size_t len) {
2970 // Try to make this function as atomic as possible.
2971 if (Arguments::vfprintf_hook() != nullptr) {
2972 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2973 } else {
2974 // Make an unused local variable to avoid warning from gcc compiler.
2975 bool dummy = os::write(defaultStream::output_fd(), s, len);
2976 }
2977 }
2978
2979 } // Extern C
2980
2981 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2982
2983 // In most of the JVM thread support functions we need to access the
2984 // thread through a ThreadsListHandle to prevent it from exiting and
2985 // being reclaimed while we try to operate on it. The exceptions to this
2986 // rule are when operating on the current thread, or if the monitor of
2987 // the target java.lang.Thread is locked at the Java level - in both
2988 // cases the target cannot exit.
2989
2990 static void thread_entry(JavaThread* thread, TRAPS) {
2991 HandleMark hm(THREAD);
2992 Handle obj(THREAD, thread->threadObj());
2993 JavaValue result(T_VOID);
2994 JavaCalls::call_virtual(&result,
2995 obj,
2996 vmClasses::Thread_klass(),
2997 vmSymbols::run_method_name(),
2998 vmSymbols::void_method_signature(),
2999 THREAD);
3000 }
3001
3002
3003 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3004 #if INCLUDE_CDS
3005 if (CDSConfig::allow_only_single_java_thread()) {
3006 // During java -Xshare:dump, if we allow multiple Java threads to
3007 // execute in parallel, symbols and classes may be loaded in
3008 // random orders which will make the resulting CDS archive
3009 // non-deterministic.
3010 //
3011 // Lucikly, during java -Xshare:dump, it's important to run only
3012 // the code in the main Java thread (which is NOT started here) that
3013 // creates the module graph, etc. It's safe to not start the other
3014 // threads which are launched by class static initializers
3015 // (ReferenceHandler, FinalizerThread and CleanerImpl).
3016 if (log_is_enabled(Info, cds)) {
3017 ResourceMark rm;
3018 oop t = JNIHandles::resolve_non_null(jthread);
3019 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
3020 }
3021 return;
3022 }
3023 #endif
3024 JavaThread *native_thread = nullptr;
3025
3026 // We cannot hold the Threads_lock when we throw an exception,
3027 // due to rank ordering issues. Example: we might need to grab the
3028 // Heap_lock while we construct the exception.
3029 bool throw_illegal_thread_state = false;
3030
3031 // We must release the Threads_lock before we can post a jvmti event
3032 // in Thread::start.
3033 {
3034 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
3035 // Ensure that the C++ Thread and OSThread structures aren't freed before
3036 // we operate.
3037 MutexLocker ml(Threads_lock);
3038
3039 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3040 // re-starting an already started thread, so we should usually find
3041 // that the JavaThread is null. However for a JNI attached thread
3042 // there is a small window between the Thread object being created
3043 // (with its JavaThread set) and the update to its threadStatus, so we
3044 // have to check for this
3045 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
3046 throw_illegal_thread_state = true;
3047 } else {
3048 jlong size =
3049 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3050 // Allocate the C++ Thread structure and create the native thread. The
3051 // stack size retrieved from java is 64-bit signed, but the constructor takes
3052 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3053 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3054 // - Avoid passing negative values which would result in really large stacks.
3055 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3056 size_t sz = size > 0 ? (size_t) size : 0;
3057 native_thread = new JavaThread(&thread_entry, sz);
3058
3059 // At this point it may be possible that no osthread was created for the
3060 // JavaThread due to lack of memory. Check for this situation and throw
3061 // an exception if necessary. Eventually we may want to change this so
3062 // that we only grab the lock if the thread was created successfully -
3063 // then we can also do this check and throw the exception in the
3064 // JavaThread constructor.
3065 if (native_thread->osthread() != nullptr) {
3066 // Note: the current thread is not being used within "prepare".
3067 native_thread->prepare(jthread);
3068 }
3069 }
3070 }
3071
3072 if (throw_illegal_thread_state) {
3073 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3074 }
3075
3076 assert(native_thread != nullptr, "Starting null thread?");
3077
3078 if (native_thread->osthread() == nullptr) {
3079 ResourceMark rm(thread);
3080 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3081 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3082 // No one should hold a reference to the 'native_thread'.
3083 native_thread->smr_delete();
3084 if (JvmtiExport::should_post_resource_exhausted()) {
3085 JvmtiExport::post_resource_exhausted(
3086 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3087 os::native_thread_creation_failed_msg());
3088 }
3089 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3090 os::native_thread_creation_failed_msg());
3091 }
3092
3093 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3094
3095 Thread::start(native_thread);
3096
3097 JVM_END
3098
3099
3100 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3101 ThreadsListHandle tlh(thread);
3102 oop java_thread = nullptr;
3103 JavaThread* receiver = nullptr;
3104 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3105 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3106
3107 if (is_alive) {
3108 // jthread refers to a live JavaThread.
3109 Thread::set_priority(receiver, (ThreadPriority)prio);
3110 }
3111 // Implied else: If the JavaThread hasn't started yet, then the
3112 // priority set in the java.lang.Thread object above will be pushed
3113 // down when it does start.
3114 JVM_END
3115
3116
3117 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3118 HOTSPOT_THREAD_YIELD();
3119 os::naked_yield();
3120 JVM_END
3121
3122 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3123 if (nanos < 0) {
3124 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3125 }
3126
3127 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3128 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3129 }
3130
3131 // Save current thread state and restore it at the end of this block.
3132 // And set new thread state to SLEEPING.
3133 JavaThreadSleepState jtss(thread);
3134
3135 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3136
3137 if (nanos == 0) {
3138 os::naked_yield();
3139 } else {
3140 ThreadState old_state = thread->osthread()->get_state();
3141 thread->osthread()->set_state(SLEEPING);
3142 if (!thread->sleep_nanos(nanos)) { // interrupted
3143 // An asynchronous exception could have been thrown on
3144 // us while we were sleeping. We do not overwrite those.
3145 if (!HAS_PENDING_EXCEPTION) {
3146 HOTSPOT_THREAD_SLEEP_END(1);
3147
3148 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3149 // to properly restore the thread state. That's likely wrong.
3150 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3151 }
3152 }
3153 thread->osthread()->set_state(old_state);
3154 }
3155 HOTSPOT_THREAD_SLEEP_END(0);
3156 JVM_END
3157
3158 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3159 oop jthread = thread->threadObj();
3160 assert(jthread != nullptr, "no current carrier thread!");
3161 return JNIHandles::make_local(THREAD, jthread);
3162 JVM_END
3163
3164 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3165 oop theThread = thread->vthread();
3166 assert(theThread != (oop)nullptr, "no current thread!");
3167 return JNIHandles::make_local(THREAD, theThread);
3168 JVM_END
3169
3170 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3171 jobject theThread))
3172 oop threadObj = JNIHandles::resolve(theThread);
3173 thread->set_vthread(threadObj);
3174
3175 // Set _monitor_owner_id of new current Thread
3176 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3177
3178 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3179 JVM_END
3180
3181 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3182 return ThreadIdentifier::unsafe_offset();
3183 JVM_END
3184
3185 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3186 ThreadsListHandle tlh(thread);
3187 JavaThread* receiver = nullptr;
3188 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3189 if (is_alive) {
3190 // jthread refers to a live JavaThread.
3191 receiver->interrupt();
3192 }
3193 JVM_END
3194
3195 // Return true iff the current thread has locked the object passed in
3196
3197 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3198 if (obj == nullptr) {
3199 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3200 }
3201 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3202 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3203 JVM_END
3204
3205 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3206 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3207 return JNIHandles::make_local(THREAD, trace);
3208 JVM_END
3209
3210 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3211 // We don't use a ThreadsListHandle here because the current thread
3212 // must be alive.
3213 oop java_thread = JNIHandles::resolve_non_null(jthread);
3214 JavaThread* thr = java_lang_Thread::thread(java_thread);
3215 if (thread == thr && !thr->has_attached_via_jni()) {
3216 // Thread naming is only supported for the current thread and
3217 // we don't set the name of an attached thread to avoid stepping
3218 // on other programs.
3219 ResourceMark rm(thread);
3220 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3221 os::set_native_thread_name(thread_name);
3222 }
3223 JVM_END
3224
3225 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3226 oop theCache = thread->scopedValueCache();
3227 return JNIHandles::make_local(THREAD, theCache);
3228 JVM_END
3229
3230 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3231 jobject theCache))
3232 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3233 thread->set_scopedValueCache(objs);
3234 JVM_END
3235
3236
3237 // java.lang.Package ////////////////////////////////////////////////////////////////
3238
3239
3240 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3241 ResourceMark rm(THREAD);
3242 JvmtiVMObjectAllocEventCollector oam;
3243 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3244 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3245 return (jstring) JNIHandles::make_local(THREAD, result);
3246 JVM_END
3247
3248
3249 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3250 JvmtiVMObjectAllocEventCollector oam;
3251 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3252 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3253 JVM_END
3254
3255
3256 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3257
3258
3259 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3260 MonitorLocker ml(Heap_lock);
3261 oop ref = Universe::reference_pending_list();
3262 if (ref != nullptr) {
3263 Universe::clear_reference_pending_list();
3264 }
3265 return JNIHandles::make_local(THREAD, ref);
3266 JVM_END
3267
3268 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3269 MonitorLocker ml(Heap_lock);
3270 return Universe::has_reference_pending_list();
3271 JVM_END
3272
3273 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3274 MonitorLocker ml(Heap_lock);
3275 while (!Universe::has_reference_pending_list()) {
3276 ml.wait();
3277 }
3278 JVM_END
3279
3280 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3281 oop ref_oop = JNIHandles::resolve_non_null(ref);
3282 // PhantomReference has it's own implementation of refersTo().
3283 // See: JVM_PhantomReferenceRefersTo
3284 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3285 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3286 return referent == JNIHandles::resolve(o);
3287 JVM_END
3288
3289 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3290 oop ref_oop = JNIHandles::resolve_non_null(ref);
3291 // FinalReference has it's own implementation of clear().
3292 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3293 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3294 // If the referent has already been cleared then done.
3295 // However, if the referent is dead but has not yet been cleared by
3296 // concurrent reference processing, it should NOT be cleared here.
3297 // Instead, clearing should be left to the GC. Clearing it here could
3298 // detectably lose an expected notification, which is impossible with
3299 // STW reference processing. The clearing in enqueue() doesn't have
3300 // this problem, since the enqueue covers the notification, but it's not
3301 // worth the effort to handle that case specially.
3302 return;
3303 }
3304 java_lang_ref_Reference::clear_referent(ref_oop);
3305 JVM_END
3306
3307
3308 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3309
3310
3311 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3312 oop ref_oop = JNIHandles::resolve_non_null(ref);
3313 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3314 return referent == JNIHandles::resolve(o);
3315 JVM_END
3316
3317
3318 // ObjectInputStream ///////////////////////////////////////////////////////////////
3319
3320 // Return the first user-defined class loader up the execution stack, or null
3321 // if only code from the bootstrap or platform class loader is on the stack.
3322
3323 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3324 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3325 InstanceKlass* ik = vfst.method()->method_holder();
3326 oop loader = ik->class_loader();
3327 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3328 return JNIHandles::make_local(THREAD, loader);
3329 }
3330 }
3331 return nullptr;
3332 JVM_END
3333
3334
3335 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3336
3337
3338 // resolve array handle and check arguments
3339 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3340 if (arr == nullptr) {
3341 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3342 }
3343 oop a = JNIHandles::resolve_non_null(arr);
3344 if (!a->is_array()) {
3345 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3346 } else if (type_array_only && !a->is_typeArray()) {
3347 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3348 }
3349 return arrayOop(a);
3350 }
3351
3352
3353 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3354 arrayOop a = check_array(env, arr, false, CHECK_0);
3355 return a->length();
3356 JVM_END
3357
3358
3359 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3360 JvmtiVMObjectAllocEventCollector oam;
3361 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3362 jvalue value;
3363 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3364 oop box = Reflection::box(&value, type, CHECK_NULL);
3365 return JNIHandles::make_local(THREAD, box);
3366 JVM_END
3367
3368
3369 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3370 jvalue value;
3371 value.i = 0; // to initialize value before getting used in CHECK
3372 arrayOop a = check_array(env, arr, true, CHECK_(value));
3373 assert(a->is_typeArray(), "just checking");
3374 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3375 BasicType wide_type = (BasicType) wCode;
3376 if (type != wide_type) {
3377 Reflection::widen(&value, type, wide_type, CHECK_(value));
3378 }
3379 return value;
3380 JVM_END
3381
3382
3383 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3384 arrayOop a = check_array(env, arr, false, CHECK);
3385 oop box = JNIHandles::resolve(val);
3386 jvalue value;
3387 value.i = 0; // to initialize value before getting used in CHECK
3388 BasicType value_type;
3389 if (a->is_objArray()) {
3390 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3391 value_type = Reflection::unbox_for_regular_object(box, &value);
3392 } else {
3393 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3394 }
3395 Reflection::array_set(&value, a, index, value_type, CHECK);
3396 JVM_END
3397
3398
3399 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3400 arrayOop a = check_array(env, arr, true, CHECK);
3401 assert(a->is_typeArray(), "just checking");
3402 BasicType value_type = (BasicType) vCode;
3403 Reflection::array_set(&v, a, index, value_type, CHECK);
3404 JVM_END
3405
3406
3407 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3408 JvmtiVMObjectAllocEventCollector oam;
3409 oop element_mirror = JNIHandles::resolve(eltClass);
3410 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3411 return JNIHandles::make_local(THREAD, result);
3412 JVM_END
3413
3414
3415 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3416 JvmtiVMObjectAllocEventCollector oam;
3417 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3418 oop element_mirror = JNIHandles::resolve(eltClass);
3419 assert(dim_array->is_typeArray(), "just checking");
3420 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3421 return JNIHandles::make_local(THREAD, result);
3422 JVM_END
3423
3424
3425 // Library support ///////////////////////////////////////////////////////////////////////////
3426
3427 JVM_LEAF(void*, JVM_LoadZipLibrary())
3428 return ZipLibrary::handle();
3429 JVM_END
3430
3431 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3432 //%note jvm_ct
3433 char ebuf[1024];
3434 void *load_result;
3435 {
3436 ThreadToNativeFromVM ttnfvm(thread);
3437 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3438 }
3439 if (load_result == nullptr) {
3440 if (throwException) {
3441 char msg[1024];
3442 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3443 // Since 'ebuf' may contain a string encoded using
3444 // platform encoding scheme, we need to pass
3445 // Exceptions::unsafe_to_utf8 to the new_exception method
3446 // as the last argument. See bug 6367357.
3447 Handle h_exception =
3448 Exceptions::new_exception(thread,
3449 vmSymbols::java_lang_UnsatisfiedLinkError(),
3450 msg, Exceptions::unsafe_to_utf8);
3451
3452 THROW_HANDLE_NULL(h_exception);
3453 } else {
3454 log_info(library)("Failed to load library %s", name);
3455 return load_result;
3456 }
3457 }
3458 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3459 return load_result;
3460 JVM_END
3461
3462
3463 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3464 os::dll_unload(handle);
3465 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3466 JVM_END
3467
3468
3469 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3470 void* find_result = os::dll_lookup(handle, name);
3471 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3472 find_result != nullptr ? "Found" : "Failed to find",
3473 name, p2i(handle));
3474 return find_result;
3475 JVM_END
3476
3477
3478 // JNI version ///////////////////////////////////////////////////////////////////////////////
3479
3480 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3481 return Threads::is_supported_jni_version_including_1_1(version);
3482 JVM_END
3483
3484
3485 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3486 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3487 JVM_END
3488
3489 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3490 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3491 JVM_END
3492
3493 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3494 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3495 JVM_END
3496
3497 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3498 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3499 JVM_END
3500
3501 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3502 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3503 JVM_END
3504
3505 // String support ///////////////////////////////////////////////////////////////////////////
3506
3507 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3508 JvmtiVMObjectAllocEventCollector oam;
3509 if (str == nullptr) return nullptr;
3510 oop string = JNIHandles::resolve_non_null(str);
3511 oop result = StringTable::intern(string, CHECK_NULL);
3512 return (jstring) JNIHandles::make_local(THREAD, result);
3513 JVM_END
3514
3515
3516 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3517
3518 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3519 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3520 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3521 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3522 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3523 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3524
3525
3526 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3527 VM_Exit::block_if_vm_exited();
3528 return new PlatformMutex();
3529 }
3530
3531
3532 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3533 VM_Exit::block_if_vm_exited();
3534 delete ((PlatformMutex*) mon);
3535 }
3536
3537
3538 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3539 VM_Exit::block_if_vm_exited();
3540 ((PlatformMutex*) mon)->lock();
3541 return 0;
3542 }
3543
3544
3545 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3546 VM_Exit::block_if_vm_exited();
3547 ((PlatformMutex*) mon)->unlock();
3548 }
3549
3550
3551 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3552
3553 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3554 Handle loader, jboolean throwError, TRAPS) {
3555 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3556
3557 // Check if we should initialize the class
3558 if (init && klass->is_instance_klass()) {
3559 klass->initialize(CHECK_NULL);
3560 }
3561 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3562 }
3563
3564
3565 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3566
3567 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3568 Handle method_handle;
3569 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3570 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3571 Handle receiver(THREAD, JNIHandles::resolve(obj));
3572 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3573 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3574 jobject res = JNIHandles::make_local(THREAD, result);
3575 if (JvmtiExport::should_post_vm_object_alloc()) {
3576 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3577 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3578 if (java_lang_Class::is_primitive(ret_type)) {
3579 // Only for primitive type vm allocates memory for java object.
3580 // See box() method.
3581 JvmtiExport::post_vm_object_alloc(thread, result);
3582 }
3583 }
3584 return res;
3585 } else {
3586 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3587 }
3588 JVM_END
3589
3590
3591 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3592 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3593 oop constructor_mirror = JNIHandles::resolve(c);
3594 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3595 jobject res = JNIHandles::make_local(THREAD, result);
3596 if (JvmtiExport::should_post_vm_object_alloc()) {
3597 JvmtiExport::post_vm_object_alloc(thread, result);
3598 }
3599 return res;
3600 JVM_END
3601
3602 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3604 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3605 JVM_END
3606
3607 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3608 jclass caller,
3609 jstring interfaceMethodName,
3610 jobject factoryType,
3611 jobject interfaceMethodType,
3612 jobject implementationMember,
3613 jobject dynamicMethodType,
3614 jclass lambdaProxyClass))
3615 #if INCLUDE_CDS
3616 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3617 return;
3618 }
3619
3620 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3621 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3622 if (caller_ik->is_hidden()) {
3623 // Hidden classes not of type lambda proxy classes are currently not being archived.
3624 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3625 // registered for archiving.
3626 return;
3627 }
3628 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3629 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3630 assert(lambda_ik->is_hidden(), "must be a hidden class");
3631 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3632
3633 Symbol* interface_method_name = nullptr;
3634 if (interfaceMethodName != nullptr) {
3635 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3636 }
3637 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3638 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3639
3640 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3641 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3642
3643 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3644 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3645 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3646
3647 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3648 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3649
3650 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3651 interface_method_type, m, dynamic_method_type, THREAD);
3652 #endif // INCLUDE_CDS
3653 JVM_END
3654
3655 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3656 jclass caller,
3657 jstring interfaceMethodName,
3658 jobject factoryType,
3659 jobject interfaceMethodType,
3660 jobject implementationMember,
3661 jobject dynamicMethodType))
3662 #if INCLUDE_CDS
3663
3664 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3665 implementationMember == nullptr || dynamicMethodType == nullptr) {
3666 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3667 }
3668
3669 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3670 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3671 if (!caller_ik->is_shared()) {
3672 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3673 return nullptr;
3674 }
3675
3676 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3677 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3678 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3679
3680 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3681 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3682
3683 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3684 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3685 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3686
3687 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3688 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3689
3690 InstanceKlass* loaded_lambda =
3691 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3692 interface_method_type, m, dynamic_method_type,
3693 CHECK_(nullptr));
3694 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3695 #else
3696 return nullptr;
3697 #endif // INCLUDE_CDS
3698 JVM_END
3699
3700 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3701 if (CDSConfig::is_dumping_static_archive()) {
3702 // We do this so that the default CDS archive can be deterministic.
3703 const char* release = VM_Version::vm_release();
3704 const char* dbg_level = VM_Version::jdk_debug_level();
3705 const char* version = VM_Version::internal_vm_info_string();
3706 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3707 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3708 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3709 seed += (jlong)VM_Version::vm_major_version();
3710 seed += (jlong)VM_Version::vm_minor_version();
3711 seed += (jlong)VM_Version::vm_security_version();
3712 seed += (jlong)VM_Version::vm_patch_version();
3713 if (seed == 0) { // don't let this ever be zero.
3714 seed = 0x87654321;
3715 }
3716 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3717 return seed;
3718 } else {
3719 return 0;
3720 }
3721 JVM_END
3722
3723 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3724 return CDSConfig::get_status();
3725 JVM_END
3726
3727 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3728 #if INCLUDE_CDS
3729 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3730 if (line != nullptr) {
3731 ResourceMark rm(THREAD);
3732 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3733 char* c_line = java_lang_String::as_utf8_string(h_line());
3734 if (CDSConfig::is_dumping_dynamic_archive()) {
3735 // Note: LambdaFormInvokers::append take same format which is not
3736 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3737 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3738 }
3739 if (ClassListWriter::is_enabled()) {
3740 ClassListWriter w;
3741 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3742 }
3743 }
3744 #endif // INCLUDE_CDS
3745 JVM_END
3746
3747 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3748 #if INCLUDE_CDS
3749 ResourceMark rm(THREAD);
3750 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3751 char* file_name = java_lang_String::as_utf8_string(file_handle());
3752 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3753 #endif // INCLUDE_CDS
3754 JVM_END
3755
3756 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3757 #if INCLUDE_CDS
3758 ResourceMark rm(THREAD);
3759 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3760 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3761 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3762 #endif // INCLUDE_CDS
3763 JVM_END
3764
3765 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3766 #if INCLUDE_CDS
3767 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3768 if (!k->is_instance_klass()) {
3769 return false;
3770 } else {
3771 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3772 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3773 // This class will be cached in AOT-initialized state. No need for init barriers.
3774 return false;
3775 } else {
3776 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3777 // must emit barriers to ensure class initialization during production run.
3778 ResourceMark rm(THREAD);
3779 log_debug(cds)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3780 return true;
3781 }
3782 }
3783 #else
3784 return false;
3785 #endif // INCLUDE_CDS
3786 JVM_END
3787
3788 // Returns an array of all live Thread objects (VM internal JavaThreads,
3789 // jvmti agent threads, and JNI attaching threads are skipped)
3790 // See CR 6404306 regarding JNI attaching threads
3791 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3792 ResourceMark rm(THREAD);
3793 ThreadsListEnumerator tle(THREAD, false, false);
3794 JvmtiVMObjectAllocEventCollector oam;
3795
3796 int num_threads = tle.num_threads();
3797 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3798 objArrayHandle threads_ah(THREAD, r);
3799
3800 for (int i = 0; i < num_threads; i++) {
3801 Handle h = tle.get_threadObj(i);
3802 threads_ah->obj_at_put(i, h());
3803 }
3804
3805 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3806 JVM_END
3807
3808
3809 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3810 // Return StackTraceElement[][], each element is the stack trace of a thread in
3811 // the corresponding entry in the given threads array
3812 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3813 JvmtiVMObjectAllocEventCollector oam;
3814
3815 // Check if threads is null
3816 if (threads == nullptr) {
3817 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3818 }
3819
3820 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3821 objArrayHandle ah(THREAD, a);
3822 int num_threads = ah->length();
3823 // check if threads is non-empty array
3824 if (num_threads == 0) {
3825 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3826 }
3827
3828 // check if threads is not an array of objects of Thread class
3829 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3830 if (k != vmClasses::Thread_klass()) {
3831 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3832 }
3833
3834 ResourceMark rm(THREAD);
3835
3836 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3837 for (int i = 0; i < num_threads; i++) {
3838 oop thread_obj = ah->obj_at(i);
3839 instanceHandle h(THREAD, (instanceOop) thread_obj);
3840 thread_handle_array->append(h);
3841 }
3842
3843 // The JavaThread references in thread_handle_array are validated
3844 // in VM_ThreadDump::doit().
3845 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3846 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3847
3848 JVM_END
3849
3850 // JVM monitoring and management support
3851 JVM_LEAF(void*, JVM_GetManagement(jint version))
3852 return Management::get_jmm_interface(version);
3853 JVM_END
3854
3855 // com.sun.tools.attach.VirtualMachine agent properties support
3856 //
3857 // Initialize the agent properties with the properties maintained in the VM
3858 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3859 ResourceMark rm;
3860
3861 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3862
3863 PUTPROP(props, "sun.java.command", Arguments::java_command());
3864 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3865 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3866 return properties;
3867 JVM_END
3868
3869 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3870 {
3871 JvmtiVMObjectAllocEventCollector oam;
3872
3873 if (ofClass == nullptr) {
3874 return nullptr;
3875 }
3876 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3877 // Special handling for primitive objects
3878 if (java_lang_Class::is_primitive(mirror())) {
3879 return nullptr;
3880 }
3881 Klass* k = java_lang_Class::as_Klass(mirror());
3882 if (!k->is_instance_klass()) {
3883 return nullptr;
3884 }
3885 InstanceKlass* ik = InstanceKlass::cast(k);
3886 int encl_method_class_idx = ik->enclosing_method_class_index();
3887 if (encl_method_class_idx == 0) {
3888 return nullptr;
3889 }
3890 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3891 objArrayHandle dest(THREAD, dest_o);
3892 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3893 dest->obj_at_put(0, enc_k->java_mirror());
3894 int encl_method_method_idx = ik->enclosing_method_method_index();
3895 if (encl_method_method_idx != 0) {
3896 Symbol* sym = ik->constants()->symbol_at(
3897 extract_low_short_from_int(
3898 ik->constants()->name_and_type_at(encl_method_method_idx)));
3899 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3900 dest->obj_at_put(1, str());
3901 sym = ik->constants()->symbol_at(
3902 extract_high_short_from_int(
3903 ik->constants()->name_and_type_at(encl_method_method_idx)));
3904 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3905 dest->obj_at_put(2, str());
3906 }
3907 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3908 }
3909 JVM_END
3910
3911 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3912 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3913 ResourceMark rm(THREAD);
3914
3915 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3916 return nullptr;
3917 }
3918
3919 char** vm_flags = Arguments::jvm_flags_array();
3920 char** vm_args = Arguments::jvm_args_array();
3921 int num_flags = Arguments::num_jvm_flags();
3922 int num_args = Arguments::num_jvm_args();
3923
3924 InstanceKlass* ik = vmClasses::String_klass();
3925 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3926 objArrayHandle result_h(THREAD, r);
3927
3928 int index = 0;
3929 for (int j = 0; j < num_flags; j++, index++) {
3930 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3931 result_h->obj_at_put(index, h());
3932 }
3933 for (int i = 0; i < num_args; i++, index++) {
3934 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3935 result_h->obj_at_put(index, h());
3936 }
3937 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3938 JVM_END
3939
3940 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3941 return os::get_signal_number(name);
3942 JVM_END
3943
3944 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3945 #if INCLUDE_JVMTI
3946 if (!DoJVMTIVirtualThreadTransitions) {
3947 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3948 return;
3949 }
3950 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3951 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3952 } else {
3953 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3954 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3955 }
3956 #endif
3957 JVM_END
3958
3959 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3960 #if INCLUDE_JVMTI
3961 if (!DoJVMTIVirtualThreadTransitions) {
3962 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3963 return;
3964 }
3965 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3966 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3967 } else {
3968 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3969 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3970 }
3971 #endif
3972 JVM_END
3973
3974 // If notifications are disabled then just update the VTMS transition bit and return.
3975 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3976 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3977 #if INCLUDE_JVMTI
3978 if (!DoJVMTIVirtualThreadTransitions) {
3979 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3980 return;
3981 }
3982 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3983 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3984 } else {
3985 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3986 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3987 }
3988 #endif
3989 JVM_END
3990
3991 // If notifications are disabled then just update the VTMS transition bit and return.
3992 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3993 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3994 #if INCLUDE_JVMTI
3995 if (!DoJVMTIVirtualThreadTransitions) {
3996 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3997 return;
3998 }
3999 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4000 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
4001 } else {
4002 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4003 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4004 }
4005 #endif
4006 JVM_END
4007
4008 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
4009 // Needed to avoid deadlocks with JVMTI suspend mechanism.
4010 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
4011 #if INCLUDE_JVMTI
4012 if (!DoJVMTIVirtualThreadTransitions) {
4013 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4014 return;
4015 }
4016 assert(thread->is_disable_suspend() != (bool)enter,
4017 "nested or unbalanced monitor enter/exit is not allowed");
4018 thread->toggle_is_disable_suspend();
4019 #endif
4020 JVM_END
4021
4022 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
4023 #if INCLUDE_JFR
4024 freeze_result result = THREAD->last_freeze_fail_result();
4025 assert(result != freeze_ok, "sanity check");
4026 EventVirtualThreadPinned event(UNTIMED);
4027 event.set_starttime(THREAD->last_freeze_fail_time());
4028 if (event.should_commit()) {
4029 ResourceMark rm(THREAD);
4030 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
4031 THREAD->post_vthread_pinned_event(&event, str, result);
4032 }
4033 #endif
4034 JVM_END
4035
4036 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
4037 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
4038 assert(parkEvent != nullptr, "not initialized");
4039
4040 OopHandle& list_head = ObjectMonitor::vthread_list_head();
4041 oop vthread_head = nullptr;
4042 while (true) {
4043 if (list_head.peek() != nullptr) {
4044 for (;;) {
4045 oop head = list_head.resolve();
4046 if (list_head.cmpxchg(head, nullptr) == head) {
4047 return JNIHandles::make_local(THREAD, head);
4048 }
4049 }
4050 }
4051 ThreadBlockInVM tbivm(THREAD);
4052 parkEvent->park();
4053 }
4054 JVM_END
4055 /*
4056 * Return the current class's class file version. The low order 16 bits of the
4057 * returned jint contain the class's major version. The high order 16 bits
4058 * contain the class's minor version.
4059 */
4060 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4061 oop mirror = JNIHandles::resolve_non_null(current);
4062 if (java_lang_Class::is_primitive(mirror)) {
4063 // return latest major version and minor version of 0.
4064 return JVM_CLASSFILE_MAJOR_VERSION;
4065 }
4066 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4067
4068 Klass* c = java_lang_Class::as_Klass(mirror);
4069 assert(c->is_instance_klass(), "must be");
4070 InstanceKlass* ik = InstanceKlass::cast(c);
4071 return (ik->minor_version() << 16) | ik->major_version();
4072 JVM_END
4073
4074 /*
4075 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4076 * get the value will see a materialized value and not a scalar-replaced
4077 * null value.
4078 */
4079 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4080 JVM_EnsureMaterializedForStackWalk(env, value);
4081 JVM_END
4082
4083 /*
4084 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4085 */
4086 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4087 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4088 JVM_END