1 /*
2 * Copyright (c) 1997, 2026, 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/aotMetaspace.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/classListParser.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/dynamicArchive.hpp"
31 #include "cds/heapShared.hpp"
32 #include "cds/lambdaFormInvokers.hpp"
33 #include "cds/lambdaProxyClassDictionary.hpp"
34 #include "classfile/classFileStream.hpp"
35 #include "classfile/classLoader.inline.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/inlineKlass.inline.hpp"
63 #include "oops/instanceKlass.hpp"
64 #include "oops/klass.inline.hpp"
65 #include "oops/method.hpp"
66 #include "oops/objArrayKlass.hpp"
67 #include "oops/objArrayOop.inline.hpp"
68 #include "oops/oop.inline.hpp"
69 #include "oops/oopCast.inline.hpp"
70 #include "oops/recordComponent.hpp"
71 #include "oops/refArrayOop.inline.hpp"
72 #include "oops/valuePayload.inline.hpp"
73 #include "prims/foreignGlobals.hpp"
74 #include "prims/jvm_misc.hpp"
75 #include "prims/jvmtiExport.hpp"
76 #include "prims/jvmtiThreadState.inline.hpp"
77 #include "prims/stackwalk.hpp"
78 #include "runtime/arguments.hpp"
79 #include "runtime/atomicAccess.hpp"
80 #include "runtime/continuation.hpp"
81 #include "runtime/deoptimization.hpp"
82 #include "runtime/globals_extension.hpp"
83 #include "runtime/handles.inline.hpp"
84 #include "runtime/handshake.hpp"
85 #include "runtime/init.hpp"
86 #include "runtime/interfaceSupport.inline.hpp"
87 #include "runtime/java.hpp"
88 #include "runtime/javaCalls.hpp"
89 #include "runtime/javaThread.hpp"
90 #include "runtime/jfieldIDWorkaround.hpp"
91 #include "runtime/jniHandles.inline.hpp"
92 #include "runtime/mountUnmountDisabler.hpp"
93 #include "runtime/os.inline.hpp"
94 #include "runtime/osThread.hpp"
95 #include "runtime/perfData.hpp"
96 #include "runtime/reflection.hpp"
97 #include "runtime/synchronizer.hpp"
98 #include "runtime/threadIdentifier.hpp"
99 #include "runtime/threadSMR.hpp"
100 #include "runtime/vframe.inline.hpp"
101 #include "runtime/vm_version.hpp"
102 #include "runtime/vmOperations.hpp"
103 #include "services/attachListener.hpp"
104 #include "services/management.hpp"
105 #include "services/threadService.hpp"
106 #include "utilities/checkedCast.hpp"
107 #include "utilities/copy.hpp"
108 #include "utilities/defaultStream.hpp"
109 #include "utilities/dtrace.hpp"
110 #include "utilities/events.hpp"
111 #include "utilities/macros.hpp"
112 #include "utilities/utf8.hpp"
113 #include "utilities/zipLibrary.hpp"
114 #if INCLUDE_CDS
115 #include "classfile/systemDictionaryShared.hpp"
116 #endif
117 #if INCLUDE_JFR
118 #include "jfr/jfr.hpp"
119 #endif
120 #if INCLUDE_MANAGEMENT
121 #include "services/finalizerService.hpp"
122 #endif
123
124 #include <errno.h>
125
126 /*
127 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
128 such ctors and calls MUST NOT come between an oop declaration/init and its
129 usage because if objects are move this may cause various memory stomps, bus
130 errors and segfaults. Here is a cookbook for causing so called "naked oop
131 failures":
132
133 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
134 // Object address to be held directly in mirror & not visible to GC
135 oop mirror = JNIHandles::resolve_non_null(ofClass);
136
137 // If this ctor can hit a safepoint, moving objects around, then
138 ComplexConstructor foo;
139
140 // Boom! mirror may point to JUNK instead of the intended object
141 (some dereference of mirror)
142
143 // Here's another call that may block for GC, making mirror stale
144 MutexLocker ml(some_lock);
145
146 // And here's an initializer that can result in a stale oop
147 // all in one step.
148 oop o = call_that_can_throw_exception(TRAPS);
149
150
151 The solution is to keep the oop declaration BELOW the ctor or function
152 call that might cause a GC, do another resolve to reassign the oop, or
153 consider use of a Handle instead of an oop so there is immunity from object
154 motion. But note that the "QUICK" entries below do not have a handlemark
155 and thus can only support use of handles passed in.
156 */
157
158 extern void trace_class_resolution(Klass* to_class) {
159 ResourceMark rm;
160 int line_number = -1;
161 const char * source_file = nullptr;
162 const char * trace = "explicit";
163 InstanceKlass* caller = nullptr;
164 JavaThread* jthread = JavaThread::current();
165 if (jthread->has_last_Java_frame()) {
166 vframeStream vfst(jthread);
167
168 // Scan up the stack skipping ClassLoader frames.
169 Method* last_caller = nullptr;
170
171 while (!vfst.at_end()) {
172 Method* m = vfst.method();
173 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
174 break;
175 }
176 last_caller = m;
177 vfst.next();
178 }
179 // if this is called from Class.forName0 and that is called from Class.forName,
180 // then print the caller of Class.forName. If this is Class.loadClass, then print
181 // that caller, otherwise keep quiet since this should be picked up elsewhere.
182 bool found_it = false;
183 if (!vfst.at_end() &&
184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
185 vfst.method()->name() == vmSymbols::forName0_name()) {
186 vfst.next();
187 if (!vfst.at_end() &&
188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
189 vfst.method()->name() == vmSymbols::forName_name()) {
190 vfst.next();
191 found_it = true;
192 }
193 } else if (last_caller != nullptr &&
194 last_caller->method_holder()->name() ==
195 vmSymbols::java_lang_ClassLoader() &&
196 last_caller->name() == vmSymbols::loadClass_name()) {
197 found_it = true;
198 } else if (!vfst.at_end()) {
199 if (vfst.method()->is_native()) {
200 // JNI call
201 found_it = true;
202 }
203 }
204 if (found_it && !vfst.at_end()) {
205 // found the caller
206 caller = vfst.method()->method_holder();
207 line_number = vfst.method()->line_number_from_bci(vfst.bci());
208 if (line_number == -1) {
209 // show method name if it's a native method
210 trace = vfst.method()->name_and_sig_as_C_string();
211 }
212 Symbol* s = caller->source_file_name();
213 if (s != nullptr) {
214 source_file = s->as_C_string();
215 }
216 }
217 }
218 if (caller != nullptr) {
219 if (to_class != caller) {
220 const char * from = caller->external_name();
221 const char * to = to_class->external_name();
222 // print in a single call to reduce interleaving between threads
223 if (source_file != nullptr) {
224 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
225 } else {
226 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
227 }
228 }
229 }
230 }
231
232 // java.lang.System //////////////////////////////////////////////////////////////////////
233
234 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env))
235 #if INCLUDE_CDS
236 if (CDSConfig::is_dumping_preimage_static_archive()) {
237 if (!AOTMetaspace::preimage_static_archive_dumped()) {
238 AOTMetaspace::dump_static_archive(THREAD);
239 return JNI_TRUE;
240 }
241 }
242 return JNI_FALSE;
243 #else
244 return JNI_FALSE;
245 #endif // INCLUDE_CDS
246 JVM_END
247
248 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
249 return os::javaTimeMillis();
250 JVM_END
251
252 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
253 return os::javaTimeNanos();
254 JVM_END
255
256 // The function below is actually exposed by jdk.internal.misc.VM and not
257 // java.lang.System, but we choose to keep it here so that it stays next
258 // to JVM_CurrentTimeMillis and JVM_NanoTime
259
260 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
261 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
262
263 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
264 jlong seconds;
265 jlong nanos;
266
267 os::javaTimeSystemUTC(seconds, nanos);
268
269 // We're going to verify that the result can fit in a long.
270 // For that we need the difference in seconds between 'seconds'
271 // and 'offset_secs' to be such that:
272 // |seconds - offset_secs| < (2^63/10^9)
273 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
274 // which makes |seconds - offset_secs| < 2^33
275 // and we will prefer +/- 2^32 as the maximum acceptable diff
276 // as 2^32 has a more natural feel than 2^33...
277 //
278 // So if |seconds - offset_secs| >= 2^32 - we return a special
279 // sentinel value (-1) which the caller should take as an
280 // exception value indicating that the offset given to us is
281 // too far from range of the current time - leading to too big
282 // a nano adjustment. The caller is expected to recover by
283 // computing a more accurate offset and calling this method
284 // again. (For the record 2^32 secs is ~136 years, so that
285 // should rarely happen)
286 //
287 jlong diff = seconds - offset_secs;
288 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
289 return -1; // sentinel value: the offset is too far off the target
290 }
291
292 // return the adjustment. If you compute a time by adding
293 // this number of nanoseconds along with the number of seconds
294 // in the offset you should get the current UTC time.
295 return (diff * (jlong)1000000000) + nanos;
296 JVM_END
297
298 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
299 jobject dst, jint dst_pos, jint length))
300 // Check if we have null pointers
301 if (src == nullptr || dst == nullptr) {
302 THROW(vmSymbols::java_lang_NullPointerException());
303 }
304 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
305 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
306 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
307 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
308 // Do copy
309 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
310 JVM_END
311
312
313 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
314 JavaValue r(T_OBJECT);
315 // public synchronized Object put(Object key, Object value);
316 HandleMark hm(THREAD);
317 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
318 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
319 JavaCalls::call_virtual(&r,
320 props,
321 vmClasses::Properties_klass(),
322 vmSymbols::put_name(),
323 vmSymbols::object_object_object_signature(),
324 key_str,
325 value_str,
326 THREAD);
327 }
328
329
330 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
331
332 /*
333 * Return all of the system properties in a Java String array with alternating
334 * names and values from the jvm SystemProperty.
335 * Which includes some internal and all commandline -D defined properties.
336 */
337 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
338 ResourceMark rm(THREAD);
339 HandleMark hm(THREAD);
340 int ndx = 0;
341 int fixedCount = 2;
342
343 SystemProperty* p = Arguments::system_properties();
344 int count = Arguments::PropertyList_count(p);
345
346 // Allocate result String array
347 InstanceKlass* ik = vmClasses::String_klass();
348 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
349 objArrayHandle result_h(THREAD, r);
350
351 while (p != nullptr) {
352 const char * key = p->key();
353 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
354 const char * value = p->value();
355 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
356 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
357 result_h->obj_at_put(ndx * 2, key_str());
358 result_h->obj_at_put(ndx * 2 + 1, value_str());
359 ndx++;
360 }
361 p = p->next();
362 }
363
364 // Convert the -XX:MaxDirectMemorySize= command line flag
365 // to the sun.nio.MaxDirectMemorySize property.
366 // Do this after setting user properties to prevent people
367 // from setting the value with a -D option, as requested.
368 // Leave empty if not supplied
369 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
370 char as_chars[256];
371 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
372 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
373 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
374 result_h->obj_at_put(ndx * 2, key_str());
375 result_h->obj_at_put(ndx * 2 + 1, value_str());
376 ndx++;
377 }
378
379 // JVM monitoring and management support
380 // Add the sun.management.compiler property for the compiler's name
381 {
382 #undef CSIZE
383 #if defined(_LP64)
384 #define CSIZE "64-Bit "
385 #else
386 #define CSIZE
387 #endif // 64bit
388
389 #if COMPILER1_AND_COMPILER2
390 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
391 #else
392 #if defined(COMPILER1)
393 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
394 #elif defined(COMPILER2)
395 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
396 #elif INCLUDE_JVMCI
397 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
398 #else
399 const char* compiler_name = "";
400 #endif // compilers
401 #endif // COMPILER1_AND_COMPILER2
402
403 if (*compiler_name != '\0' &&
404 (Arguments::mode() != Arguments::_int)) {
405 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
406 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
407 result_h->obj_at_put(ndx * 2, key_str());
408 result_h->obj_at_put(ndx * 2 + 1, value_str());
409 ndx++;
410 }
411 }
412
413 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
414 JVM_END
415
416
417 /*
418 * Return the temporary directory that the VM uses for the attach
419 * and perf data files.
420 *
421 * It is important that this directory is well-known and the
422 * same for all VM instances. It cannot be affected by configuration
423 * variables such as java.io.tmpdir.
424 */
425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
426 HandleMark hm(THREAD);
427 const char* temp_dir = os::get_temp_directory();
428 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
429 return (jstring) JNIHandles::make_local(THREAD, h());
430 JVM_END
431
432 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
433 if (len < 0) {
434 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
435 }
436 elmClass->initialize(CHECK);
437 if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
438 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
439 }
440 if (elmClass->is_abstract()) {
441 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
442 }
443 }
444
445 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
446 oop o = JNIHandles::resolve_non_null(orig);
447 assert(o->is_array(), "Must be");
448 oop array = nullptr;
449 arrayOop org = (arrayOop)o;
450 arrayHandle oh(THREAD, org);
451 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
452 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
453 int len = to - from; // length of the new array
454 if (ak->is_null_free_array_klass()) {
455 if ((len != 0) && (from >= org->length() || to > org->length())) {
456 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
457 }
458 }
459 if (org->is_flatArray()) {
460 // The whole JVM_CopyOfSpecialArray is currently broken. Fix this in a separate bugfix.
461 int org_length = org->length();
462 int copy_len = MIN2(to, org_length) - MIN2(from, org_length);
463 FlatArrayKlass* const fak = FlatArrayKlass::cast(org->klass());
464 flatArrayOop dst = oopFactory::new_flatArray(fak, len, CHECK_NULL);
465 assert(!ak->is_null_free_array_klass() || copy_len == len,
466 "Failed to throw the IllegalArgumentException");
467 if (copy_len != 0) {
468 int start = MIN2(from, org_length - 1);
469 FlatArrayPayload src_payload(flatArrayOop(oh()), start, fak);
470 FlatArrayPayload dst_payload(dst, 0, fak);
471 int end = to < oh()->length() ? to : oh()->length();
472 for (int i = from; i < end; i++) {
473 // Copy a value
474 src_payload.copy_to(dst_payload);
475
476 // Advance to the next element
477 src_payload.next_element();
478 dst_payload.next_element();
479 }
480 }
481 array = dst;
482 } else {
483 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(org->is_null_free_array());
484
485 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
486 int end = to < oh()->length() ? to : oh()->length();
487 for (int i = from; i < end; i++) {
488 if (i < ((objArrayOop)oh())->length()) {
489 oop val = ((objArrayOop)oh())->obj_at(i, CHECK_NULL);
490 ((objArrayOop)array)->obj_at_put(i - from, val);
491 } else {
492 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
493 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
494 }
495 }
496 }
497 return (jarray) JNIHandles::make_local(THREAD, array);
498 JVM_END
499
500 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
501 oop mirror = JNIHandles::resolve_non_null(elmClass);
502 oop init = JNIHandles::resolve(initVal);
503 if (init == nullptr) {
504 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
505 }
506 Handle init_h(THREAD, init);
507 Klass* klass = java_lang_Class::as_Klass(mirror);
508 if (klass != init_h()->klass()) {
509 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
510 }
511 validate_array_arguments(klass, len, CHECK_NULL);
512 const ArrayProperties props = ArrayProperties::Default()
513 .with_null_restricted()
514 .with_non_atomic();
515
516 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
517 for (int i = 0; i < len; i++) {
518 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
519 }
520 return (jarray) JNIHandles::make_local(THREAD, array);
521 JVM_END
522
523 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
524 oop mirror = JNIHandles::resolve_non_null(elmClass);
525 oop init = JNIHandles::resolve(initVal);
526 if (init == nullptr) {
527 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
528 }
529 Handle init_h(THREAD, init);
530 Klass* klass = java_lang_Class::as_Klass(mirror);
531 if (klass != init_h()->klass()) {
532 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
533 }
534 validate_array_arguments(klass, len, CHECK_NULL);
535 const ArrayProperties props = ArrayProperties::Default().with_null_restricted();
536 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
537 for (int i = 0; i < len; i++) {
538 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
539 }
540 return (jarray) JNIHandles::make_local(THREAD, array);
541 JVM_END
542
543 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
544 oop mirror = JNIHandles::resolve_non_null(elmClass);
545 Klass* klass = java_lang_Class::as_Klass(mirror);
546 klass->initialize(CHECK_NULL);
547 validate_array_arguments(klass, len, CHECK_NULL);
548 objArrayOop array = oopFactory::new_objArray(klass, len, ArrayProperties::Default(), CHECK_NULL);
549 return (jarray) JNIHandles::make_local(THREAD, array);
550 JVM_END
551
552 JVM_ENTRY(jarray, JVM_NewReferenceArray(JNIEnv *env, jclass elmClass, jint len))
553 oop mirror = JNIHandles::resolve_non_null(elmClass);
554 Klass* klass = java_lang_Class::as_Klass(mirror);
555 validate_array_arguments(klass, len, CHECK_NULL);
556 refArrayOop array = oopFactory::new_refArray(klass, len, ArrayProperties::Default(), CHECK_NULL);
557 return (jarray) JNIHandles::make_local(THREAD, array);
558 JVM_END
559
560 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
561 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
562 return oop->is_flatArray();
563 JVM_END
564
565 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
566 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
567 return oop->is_null_free_array();
568 JVM_END
569
570 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
571 // There are multiple cases where an array can/must support atomic access:
572 // - the array is a reference array
573 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT
574 // - the array is flat and its component type is naturally atomic
575 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
576 if (oop->is_refArray()) return true;
577 if (oop->is_flatArray()) {
578 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
579 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) return true;
580 if (fak->element_klass()->is_naturally_atomic()) return true;
581 }
582 return false;
583 JVM_END
584
585 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
586
587 extern volatile jint vm_created;
588
589 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
590 EventShutdown event;
591 if (event.should_commit()) {
592 event.set_reason("Shutdown requested from Java");
593 event.commit();
594 }
595 JVM_END
596
597
598 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
599 before_exit(thread, true);
600 vm_exit(code);
601 JVM_END
602
603
604 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
605 if (!DisableExplicitGC) {
606 EventSystemGC event;
607 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
608 Universe::heap()->collect(GCCause::_java_lang_system_gc);
609 event.commit();
610 }
611 JVM_END
612
613
614 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
615 return Universe::heap()->millis_since_last_whole_heap_examined();
616 JVM_END
617
618
619 static inline jlong convert_size_t_to_jlong(size_t val) {
620 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
621 NOT_LP64 (return (jlong)val;)
622 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
623 }
624
625 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
626 size_t n = Universe::heap()->capacity();
627 return convert_size_t_to_jlong(n);
628 JVM_END
629
630
631 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
632 size_t n = Universe::heap()->unused();
633 return convert_size_t_to_jlong(n);
634 JVM_END
635
636
637 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
638 size_t n = Universe::heap()->max_capacity();
639 return convert_size_t_to_jlong(n);
640 JVM_END
641
642
643 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
644 return os::active_processor_count();
645 JVM_END
646
647 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
648 #ifdef LINUX
649 if (UseContainerSupport) {
650 return JNI_TRUE;
651 }
652 #endif
653 return JNI_FALSE;
654 JVM_END
655
656 JVM_LEAF(jboolean, JVM_IsContainerized(void))
657 if (os::is_containerized()) {
658 return JNI_TRUE;
659 }
660 return JNI_FALSE;
661 JVM_END
662
663 // java.lang.Throwable //////////////////////////////////////////////////////
664
665 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
666 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
667 java_lang_Throwable::fill_in_stack_trace(exception);
668 JVM_END
669
670 // java.lang.NullPointerException ///////////////////////////////////////////
671
672 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
673 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
674
675 oop exc = JNIHandles::resolve_non_null(throwable);
676
677 Method* method;
678 int bci;
679 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
680 return nullptr;
681 }
682 if (method->is_native()) {
683 return nullptr;
684 }
685
686 stringStream ss;
687 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
688 if (ok) {
689 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
690 return (jstring) JNIHandles::make_local(THREAD, result);
691 } else {
692 return nullptr;
693 }
694 JVM_END
695
696 // java.lang.StackTraceElement //////////////////////////////////////////////
697
698
699 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
700 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
701 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
702 objArrayHandle stack_trace(THREAD, st);
703 // Fill in the allocated stack trace
704 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
705 JVM_END
706
707
708 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
709 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
710 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
711 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
712 JVM_END
713
714
715 // java.lang.StackWalker //////////////////////////////////////////////////////
716 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
717 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
718
719 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
720 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
721 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
722 if (!have_name) {
723 oop name = StringTable::intern(method->name(), CHECK);
724 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
725 }
726 if (!have_type) {
727 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
728 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
729 }
730 JVM_END
731
732 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
733 jint skip_frames, jobject contScope, jobject cont,
734 jint buffer_size, jint start_index, jobjectArray frames))
735 if (!thread->has_last_Java_frame()) {
736 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
737 }
738
739 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
740 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
741 Handle cont_h(THREAD, JNIHandles::resolve(cont));
742 // frames array is a ClassFrameInfo[] array when only getting caller reference,
743 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
744 // be null.
745 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
746 objArrayHandle frames_array_h(THREAD, fa);
747
748 if (frames_array_h->length() < buffer_size) {
749 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
750 }
751
752 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
753 buffer_size, start_index, frames_array_h, CHECK_NULL);
754 return JNIHandles::make_local(THREAD, result);
755 JVM_END
756
757
758 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
759 jint last_batch_count, jint buffer_size, jint start_index,
760 jobjectArray frames))
761 // frames array is a ClassFrameInfo[] array when only getting caller reference,
762 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
763 // be null.
764 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
765 objArrayHandle frames_array_h(THREAD, fa);
766
767 if (frames_array_h->length() < buffer_size) {
768 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
769 }
770
771 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
772 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
773 start_index, frames_array_h, THREAD);
774 JVM_END
775
776 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
777 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
778 objArrayHandle frames_array_h(THREAD, fa);
779 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
780 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
781
782 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
783 JVM_END
784
785 // java.lang.Object ///////////////////////////////////////////////
786
787
788 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
789 // as implemented in the classic virtual machine; return 0 if object is null
790 if (handle == nullptr) {
791 return 0;
792 }
793 oop obj = JNIHandles::resolve_non_null(handle);
794 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) {
795 const intptr_t obj_identity_hash = obj->mark().hash();
796 // Check if mark word contains hash code already.
797 // It is possible that the generated identity hash is 0, which is not
798 // distinct from the no_hash value. In such a case, the hash will be
799 // computed and set every time JVM_IHashCode is called. If that happens,
800 // the only consequence is losing out on the optimization.
801 if (obj_identity_hash != markWord::no_hash) {
802 return checked_cast<jint>(obj_identity_hash);
803 }
804
805 // Compute hash by calling ValueObjectMethods.valueObjectHashCode.
806 // The identity hash is invariantly immutable (see its JavaDoc comment).
807 JavaValue result(T_INT);
808 JavaCallArguments args;
809 Handle ho(THREAD, obj);
810 args.push_oop(ho);
811 methodHandle method(THREAD, Universe::value_object_hash_code_method());
812 JavaCalls::call(&result, method, &args, THREAD);
813 if (HAS_PENDING_EXCEPTION) {
814 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
815 Handle e(THREAD, PENDING_EXCEPTION);
816 CLEAR_PENDING_EXCEPTION;
817 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
818 }
819 }
820 const intptr_t identity_hash = result.get_jint();
821
822 // We now have to set the hash via CAS. It's possible that this will race
823 // other threads. By our invariant of immutability, when there is a
824 // race, the identity hash code is going to be one of the following:
825 // a) 0, another thread updated other markWord bits; b) identity_hash set
826 // by another thread; or c) identity_hash set by the current thread.
827 // A nonzero identity hash code that is not the identity_hash computed
828 // earlier indicates a violation of the invariant.
829 markWord current_mark, old_mark, new_mark;
830 do {
831 current_mark = ho->mark();
832 new_mark = current_mark.copy_set_hash(identity_hash);
833 old_mark = ho->cas_set_mark(new_mark, current_mark);
834 assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(),
835 "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT,
836 new_mark.hash(),
837 old_mark.hash());
838 } while (old_mark != current_mark);
839
840 return checked_cast<jint>(new_mark.hash());
841 } else {
842 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
843 }
844 JVM_END
845
846
847 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
848 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
849 ObjectSynchronizer::wait(obj, ms, CHECK);
850 JVM_END
851
852
853 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
854 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
855 ObjectSynchronizer::notify(obj, CHECK);
856 JVM_END
857
858
859 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
860 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
861 ObjectSynchronizer::notifyall(obj, CHECK);
862 JVM_END
863
864
865 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
866 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
867 Klass* klass = obj->klass();
868 JvmtiVMObjectAllocEventCollector oam;
869
870 #ifdef ASSERT
871 // Just checking that the cloneable flag is set correct
872 if (obj->is_array()) {
873 guarantee(klass->is_cloneable(), "all arrays are cloneable");
874 } else {
875 guarantee(obj->is_instance(), "should be instanceOop");
876 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
877 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
878 }
879 #endif
880
881 // Check if class of obj supports the Cloneable interface.
882 // All arrays are considered to be cloneable (See JLS 20.1.5).
883 // All j.l.r.Reference classes are considered non-cloneable.
884 if (!klass->is_cloneable() ||
885 (klass->is_instance_klass() &&
886 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
887 ResourceMark rm(THREAD);
888 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
889 }
890
891 if (klass->is_inline_klass()) {
892 // Value instances have no identity, so return the current instance instead of allocating a new one
893 // Value classes cannot have finalizers, so the method can return immediately
894 return JNIHandles::make_local(THREAD, obj());
895 }
896
897 // Make shallow object copy
898 const size_t size = obj->size();
899 oop new_obj_oop = nullptr;
900 if (obj->is_array()) {
901 const int length = ((arrayOop)obj())->length();
902 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
903 /* do_zero */ true, CHECK_NULL);
904 } else {
905 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
906 }
907
908 HeapAccess<>::clone(obj(), new_obj_oop, size);
909
910 Handle new_obj(THREAD, new_obj_oop);
911 // Caution: this involves a java upcall, so the clone should be
912 // "gc-robust" by this stage.
913 if (klass->has_finalizer()) {
914 assert(obj->is_instance(), "should be instanceOop");
915 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
916 new_obj = Handle(THREAD, new_obj_oop);
917 }
918
919 return JNIHandles::make_local(THREAD, new_obj());
920 JVM_END
921
922 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
923
924 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
925 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
926 JVM_END
927
928 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
929 return InstanceKlass::is_finalization_enabled();
930 JVM_END
931
932 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
933
934 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
935 CONT_RegisterNativeMethods(env, cls);
936 JVM_END
937
938 // java.io.File ///////////////////////////////////////////////////////////////
939
940 JVM_LEAF(char*, JVM_NativePath(char* path))
941 return os::native_path(path);
942 JVM_END
943
944
945 // Misc. class handling ///////////////////////////////////////////////////////////
946
947
948 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
949 // Getting the class of the caller frame.
950 //
951 // The call stack at this point looks something like this:
952 //
953 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
954 // [1] [ @CallerSensitive API.method ]
955 // [.] [ (skipped intermediate frames) ]
956 // [n] [ caller ]
957 vframeStream vfst(thread);
958 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
959 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
960 Method* m = vfst.method();
961 assert(m != nullptr, "sanity");
962 switch (n) {
963 case 0:
964 // This must only be called from Reflection.getCallerClass
965 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
966 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
967 }
968 // fall-through
969 case 1:
970 // Frame 0 and 1 must be caller sensitive.
971 if (!m->caller_sensitive()) {
972 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
973 }
974 break;
975 default:
976 if (!m->is_ignored_by_security_stack_walk()) {
977 // We have reached the desired frame; return the holder class.
978 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
979 }
980 break;
981 }
982 }
983 return nullptr;
984 JVM_END
985
986
987 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
988 oop mirror = nullptr;
989 BasicType t = name2type(utf);
990 if (t != T_ILLEGAL && !is_reference_type(t)) {
991 mirror = Universe::java_mirror(t);
992 }
993 if (mirror == nullptr) {
994 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
995 } else {
996 return (jclass) JNIHandles::make_local(THREAD, mirror);
997 }
998 JVM_END
999
1000
1001 // Returns a class loaded by the bootstrap class loader; or null
1002 // if not found. ClassNotFoundException is not thrown.
1003 // FindClassFromBootLoader is exported to the launcher for windows.
1004 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
1005 const char* name))
1006 // Java libraries should ensure that name is never null or illegal.
1007 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
1008 // It's impossible to create this class; the name cannot fit
1009 // into the constant pool.
1010 return nullptr;
1011 }
1012 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
1013
1014 TempNewSymbol h_name = SymbolTable::new_symbol(name);
1015 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
1016 if (k == nullptr) {
1017 return nullptr;
1018 }
1019
1020 if (log_is_enabled(Debug, class, resolve)) {
1021 trace_class_resolution(k);
1022 }
1023 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1024 JVM_END
1025
1026 // Find a class with this name in this loader.
1027 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
1028 jboolean init, jobject loader))
1029 TempNewSymbol h_name =
1030 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1031 CHECK_NULL);
1032
1033 oop loader_oop = JNIHandles::resolve(loader);
1034 Handle h_loader(THREAD, loader_oop);
1035
1036 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1037 false, THREAD);
1038
1039 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1040 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1041 }
1042 return result;
1043 JVM_END
1044
1045 // Currently only called from the old verifier.
1046 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1047 jboolean init, jclass from))
1048 TempNewSymbol h_name =
1049 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1050 CHECK_NULL);
1051 oop from_class_oop = JNIHandles::resolve(from);
1052 assert(from_class_oop != nullptr, "must be");
1053 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1054 assert(from_class != nullptr, "must be");
1055 oop class_loader = from_class->class_loader();
1056
1057 Handle h_loader(THREAD, class_loader);
1058 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1059
1060 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1061 // this function is generally only used for class loading during verification.
1062 ResourceMark rm;
1063 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1064 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1065 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1066 }
1067
1068 #if INCLUDE_CDS
1069 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1070 InstanceKlass* ik = InstanceKlass::cast(from_class);
1071 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1072 }
1073 #endif
1074
1075 return result;
1076 JVM_END
1077
1078 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1079 static jclass jvm_define_class_common(const char *name,
1080 jobject loader, const jbyte *buf,
1081 jsize len, jobject pd, const char *source,
1082 TRAPS) {
1083 if (source == nullptr) source = "__JVM_DefineClass__";
1084
1085 JavaThread* jt = THREAD;
1086
1087 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1088 ClassLoader::perf_define_appclass_selftime(),
1089 ClassLoader::perf_define_appclasses(),
1090 jt->get_thread_stat()->perf_recursion_counts_addr(),
1091 jt->get_thread_stat()->perf_timers_addr(),
1092 PerfClassTraceTime::DEFINE_CLASS);
1093
1094 if (UsePerfData) {
1095 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1096 }
1097
1098 // Class resolution will get the class name from the .class stream if the name is null.
1099 TempNewSymbol class_name = name == nullptr ? nullptr :
1100 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1101 CHECK_NULL);
1102
1103 ResourceMark rm(THREAD);
1104 ClassFileStream st((u1*)buf, len, source);
1105 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1106 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1107 ClassLoadInfo cl_info(protection_domain);
1108 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1109 class_loader,
1110 cl_info,
1111 CHECK_NULL);
1112
1113 if (log_is_enabled(Debug, class, resolve)) {
1114 trace_class_resolution(k);
1115 }
1116
1117 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1118 }
1119
1120 enum {
1121 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1122 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1123 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1124 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1125 };
1126
1127 /*
1128 * Define a class with the specified flags that indicates if it's a nestmate,
1129 * hidden, or strongly referenced from class loader.
1130 */
1131 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1132 const jbyte *buf, jsize len, jobject pd,
1133 jboolean init, int flags, jobject classData, TRAPS) {
1134 ResourceMark rm(THREAD);
1135
1136 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1137 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1138 if (lookup_k == nullptr) {
1139 // The error message is wrong. We come here only if lookup is a primitive class
1140 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1141 }
1142
1143 Handle class_loader (THREAD, lookup_k->class_loader());
1144
1145 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1146 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1147 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1148 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1149
1150 InstanceKlass* host_class = nullptr;
1151 if (is_nestmate) {
1152 host_class = lookup_k->nest_host(CHECK_NULL);
1153 }
1154
1155 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1156 name,
1157 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1158 is_nestmate ? host_class->external_name() : "",
1159 is_hidden ? "hidden" : "not hidden",
1160 is_strong ? "strong" : "weak",
1161 vm_annotations ? "with vm annotations" : "without vm annotation");
1162
1163 if (!is_hidden) {
1164 // classData is only applicable for hidden classes
1165 if (classData != nullptr) {
1166 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1167 }
1168 if (is_nestmate) {
1169 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1170 }
1171 if (!is_strong) {
1172 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1173 }
1174 if (vm_annotations) {
1175 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1176 }
1177 if (flags != STRONG_LOADER_LINK) {
1178 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1179 err_msg("invalid flag 0x%x", flags));
1180 }
1181 }
1182
1183 // Class resolution will get the class name from the .class stream if the name is null.
1184 TempNewSymbol class_name = name == nullptr ? nullptr :
1185 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1186 CHECK_NULL);
1187
1188 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1189 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1190 ClassFileStream st((u1*)buf, len, source);
1191
1192 InstanceKlass* ik = nullptr;
1193 if (!is_hidden) {
1194 ClassLoadInfo cl_info(protection_domain);
1195 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1196 class_loader,
1197 cl_info,
1198 CHECK_NULL);
1199
1200 if (log_is_enabled(Debug, class, resolve)) {
1201 trace_class_resolution(ik);
1202 }
1203 } else { // hidden
1204 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1205 ClassLoadInfo cl_info(protection_domain,
1206 host_class,
1207 classData_h,
1208 is_hidden,
1209 is_strong,
1210 vm_annotations);
1211 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1212 class_loader,
1213 cl_info,
1214 CHECK_NULL);
1215
1216 // The hidden class loader data has been artificially been kept alive to
1217 // this point. The mirror and any instances of this class have to keep
1218 // it alive afterwards.
1219 ik->class_loader_data()->dec_keep_alive_ref_count();
1220
1221 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1222 ModuleEntry* module = ik->module();
1223 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1224 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1225 module_name,
1226 ik->external_name(),
1227 host_class->external_name(),
1228 ik->is_hidden() ? "is hidden" : "is not hidden");
1229 }
1230 }
1231
1232 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1233 // non-hidden class or nestmate class must be in the same package as the Lookup class
1234 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1235 }
1236
1237 if (init) {
1238 ik->initialize(CHECK_NULL);
1239 } else {
1240 ik->link_class(CHECK_NULL);
1241 }
1242
1243 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1244 }
1245
1246 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1247 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1248 JVM_END
1249
1250 /*
1251 * Define a class with the specified lookup class.
1252 * lookup: Lookup class
1253 * name: the name of the class
1254 * buf: class bytes
1255 * len: length of class bytes
1256 * pd: protection domain
1257 * init: initialize the class
1258 * flags: properties of the class
1259 * classData: private static pre-initialized field
1260 */
1261 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1262 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1263
1264 if (lookup == nullptr) {
1265 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1266 }
1267
1268 assert(buf != nullptr, "buf must not be null");
1269
1270 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1271 JVM_END
1272
1273 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1274
1275 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1276 JVM_END
1277
1278 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1279 ResourceMark rm(THREAD);
1280
1281 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1282 char* str = java_lang_String::as_utf8_string(h_name());
1283
1284 // Sanity check, don't expect null
1285 if (str == nullptr) return nullptr;
1286
1287 // Internalize the string, converting '.' to '/' in string.
1288 char* p = (char*)str;
1289 while (*p != '\0') {
1290 if (*p == '.') {
1291 *p = '/';
1292 }
1293 p++;
1294 }
1295
1296 const int str_len = (int)(p - str);
1297 if (str_len > Symbol::max_length()) {
1298 // It's impossible to create this class; the name cannot fit
1299 // into the constant pool.
1300 return nullptr;
1301 }
1302 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1303
1304 // Security Note:
1305 // The Java level wrapper will perform the necessary security check allowing
1306 // us to pass the null as the initiating class loader.
1307 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1308 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1309 #if INCLUDE_CDS
1310 if (k == nullptr) {
1311 // If the class is not already loaded, try to see if it's in the shared
1312 // archive for the current classloader (h_loader).
1313 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1314 }
1315 #endif
1316 return (k == nullptr) ? nullptr :
1317 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1318 JVM_END
1319
1320 // Module support //////////////////////////////////////////////////////////////////////////////
1321
1322 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1323 jstring location, jobjectArray packages))
1324 Handle h_module (THREAD, JNIHandles::resolve(module));
1325 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1326 JVM_END
1327
1328 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1329 Handle h_module (THREAD, JNIHandles::resolve(module));
1330 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1331 JVM_END
1332
1333 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1334 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1335 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1336 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1337 JVM_END
1338
1339 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1340 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1341 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1342 JVM_END
1343
1344 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1345 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1346 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1347 JVM_END
1348
1349 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1350 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1351 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1352 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1353 JVM_END
1354
1355 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1356 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1357 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1358 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1359 JVM_END
1360
1361 // Reflection support //////////////////////////////////////////////////////////////////////////////
1362
1363 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1364 assert (cls != nullptr, "illegal class");
1365 JvmtiVMObjectAllocEventCollector oam;
1366 ResourceMark rm(THREAD);
1367 HandleMark hm(THREAD);
1368 Handle java_class(THREAD, JNIHandles::resolve(cls));
1369 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1370 return (jstring) JNIHandles::make_local(THREAD, result);
1371 JVM_END
1372
1373
1374 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1375 JvmtiVMObjectAllocEventCollector oam;
1376 oop mirror = JNIHandles::resolve_non_null(cls);
1377
1378 // Special handling for primitive objects
1379 if (java_lang_Class::is_primitive(mirror)) {
1380 // Primitive objects does not have any interfaces
1381 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1382 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1383 }
1384
1385 Klass* klass = java_lang_Class::as_Klass(mirror);
1386 // Figure size of result array
1387 int size;
1388 if (klass->is_instance_klass()) {
1389 InstanceKlass* ik = InstanceKlass::cast(klass);
1390 size = ik->local_interfaces()->length();
1391 } else {
1392 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1393 size = 2;
1394 }
1395
1396 // Allocate result array
1397 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1398 objArrayHandle result (THREAD, r);
1399 // Fill in result
1400 if (klass->is_instance_klass()) {
1401 // Regular instance klass, fill in all local interfaces
1402 for (int index = 0; index < size; index++) {
1403 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1404 result->obj_at_put(index, k->java_mirror());
1405 }
1406 } else {
1407 // All arrays implement java.lang.Cloneable and java.io.Serializable
1408 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1409 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1410 }
1411 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1412 JVM_END
1413
1414
1415 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1416 oop mirror = JNIHandles::resolve_non_null(cls);
1417 if (java_lang_Class::is_primitive(mirror)) {
1418 return JNI_FALSE;
1419 }
1420 Klass* k = java_lang_Class::as_Klass(mirror);
1421 return k->is_hidden();
1422 JVM_END
1423
1424
1425 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1426 ResourceMark rm(THREAD);
1427 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1428 JvmtiVMObjectAllocEventCollector oam;
1429
1430 // Iterate through Java frames
1431 vframeStream vfst(thread);
1432 for(; !vfst.at_end(); vfst.next()) {
1433 int loc = -1;
1434 // get method of frame
1435 Method* method = vfst.method();
1436
1437 Symbol *name = method->name();
1438
1439 InstanceKlass* holder = method->method_holder();
1440 if (name == vmSymbols::runWith_method_name()) {
1441 if (holder == vmClasses::Thread_klass()
1442 || holder == vmClasses::ScopedValue_Carrier_klass()) {
1443 loc = 1;
1444 }
1445 }
1446
1447 if (loc != -1) {
1448 javaVFrame *frame = vfst.asJavaVFrame();
1449 StackValueCollection* locals = frame->locals();
1450 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1451 Handle result = head_sv->get_obj();
1452 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1453 if (result() != nullptr) {
1454 return JNIHandles::make_local(THREAD, result());
1455 }
1456 }
1457 }
1458
1459 return nullptr;
1460 JVM_END
1461
1462 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1463 JvmtiVMObjectAllocEventCollector oam;
1464 // ofClass is a reference to a java_lang_Class object. The mirror object
1465 // of an InstanceKlass
1466 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1467 if (java_lang_Class::is_primitive(ofMirror) ||
1468 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1469 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1470 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1471 }
1472
1473 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1474 InnerClassesIterator iter(k);
1475
1476 if (iter.length() == 0) {
1477 // Neither an inner nor outer class
1478 oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1479 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1480 }
1481
1482 // find inner class info
1483 constantPoolHandle cp(thread, k->constants());
1484 int length = iter.length();
1485
1486 // Allocate temp. result array
1487 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL);
1488 refArrayHandle result(THREAD, r);
1489 int members = 0;
1490
1491 for (; !iter.done(); iter.next()) {
1492 int ioff = iter.inner_class_info_index();
1493 int ooff = iter.outer_class_info_index();
1494
1495 if (ioff != 0 && ooff != 0) {
1496 // Check to see if the name matches the class we're looking for
1497 // before attempting to find the class.
1498 if (cp->klass_name_at_matches(k, ooff)) {
1499 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1500 if (outer_klass == k) {
1501 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1502 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1503
1504 // Throws an exception if outer klass has not declared k as
1505 // an inner klass
1506 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1507
1508 result->obj_at_put(members, inner_klass->java_mirror());
1509 members++;
1510 }
1511 }
1512 }
1513 }
1514
1515 if (members != length) {
1516 // Return array of right length
1517 refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL);
1518 for(int i = 0; i < members; i++) {
1519 res->obj_at_put(i, result->obj_at(i));
1520 }
1521 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1522 }
1523
1524 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1525 JVM_END
1526
1527
1528 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1529 {
1530 // ofClass is a reference to a java_lang_Class object.
1531 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1532 if (java_lang_Class::is_primitive(ofMirror)) {
1533 return nullptr;
1534 }
1535 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1536 if (!klass->is_instance_klass()) {
1537 return nullptr;
1538 }
1539
1540 bool inner_is_member = false;
1541 Klass* outer_klass
1542 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1543 if (outer_klass == nullptr) return nullptr; // already a top-level class
1544 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1545 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1546 }
1547 JVM_END
1548
1549 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1550 {
1551 oop mirror = JNIHandles::resolve_non_null(cls);
1552 if (java_lang_Class::is_primitive(mirror)) {
1553 return nullptr;
1554 }
1555 Klass* klass = java_lang_Class::as_Klass(mirror);
1556 if (!klass->is_instance_klass()) {
1557 return nullptr;
1558 }
1559 InstanceKlass* k = InstanceKlass::cast(klass);
1560 int ooff = 0, noff = 0;
1561 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1562 if (noff != 0) {
1563 constantPoolHandle i_cp(thread, k->constants());
1564 Symbol* name = i_cp->symbol_at(noff);
1565 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1566 return (jstring) JNIHandles::make_local(THREAD, str());
1567 }
1568 }
1569 return nullptr;
1570 }
1571 JVM_END
1572
1573 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1574 assert (cls != nullptr, "illegal class");
1575 JvmtiVMObjectAllocEventCollector oam;
1576 ResourceMark rm(THREAD);
1577 oop mirror = JNIHandles::resolve_non_null(cls);
1578 // Return null for arrays and primitives
1579 if (!java_lang_Class::is_primitive(mirror)) {
1580 Klass* k = java_lang_Class::as_Klass(mirror);
1581 if (k->is_instance_klass()) {
1582 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1583 if (sym == nullptr) return nullptr;
1584 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1585 return (jstring) JNIHandles::make_local(THREAD, str());
1586 }
1587 }
1588 return nullptr;
1589 JVM_END
1590
1591
1592 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1593 assert (cls != nullptr, "illegal class");
1594 oop mirror = JNIHandles::resolve_non_null(cls);
1595 // Return null for arrays and primitives
1596 if (!java_lang_Class::is_primitive(mirror)) {
1597 Klass* k = java_lang_Class::as_Klass(mirror);
1598 if (k->is_instance_klass()) {
1599 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1600 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1601 }
1602 }
1603 return nullptr;
1604 JVM_END
1605
1606
1607 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1608 // some of this code was adapted from from jni_FromReflectedField
1609
1610 oop reflected = JNIHandles::resolve_non_null(field);
1611 oop mirror = java_lang_reflect_Field::clazz(reflected);
1612 int slot = java_lang_reflect_Field::slot(reflected);
1613 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1614
1615 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1616 int offset = ik->field_offset(slot);
1617
1618 if (modifiers & JVM_ACC_STATIC) {
1619 // for static fields we only look in the current class
1620 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1621 assert(false, "cannot find static field");
1622 return false;
1623 }
1624 } else {
1625 // for instance fields we start with the current class and work
1626 // our way up through the superclass chain
1627 if (!ik->find_field_from_offset(offset, false, &fd)) {
1628 assert(false, "cannot find instance field");
1629 return false;
1630 }
1631 }
1632 return true;
1633 }
1634
1635 static Method* jvm_get_method_common(jobject method) {
1636 // some of this code was adapted from from jni_FromReflectedMethod
1637
1638 oop reflected = JNIHandles::resolve_non_null(method);
1639 oop mirror = nullptr;
1640 int slot = 0;
1641
1642 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1643 mirror = java_lang_reflect_Constructor::clazz(reflected);
1644 slot = java_lang_reflect_Constructor::slot(reflected);
1645 } else {
1646 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1647 "wrong type");
1648 mirror = java_lang_reflect_Method::clazz(reflected);
1649 slot = java_lang_reflect_Method::slot(reflected);
1650 }
1651 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1652
1653 Method* m = ik->method_with_idnum(slot);
1654 assert(m != nullptr, "cannot find method");
1655 return m; // caller has to deal with null in product mode
1656 }
1657
1658 /* Type use annotations support (JDK 1.8) */
1659
1660 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1661 assert (cls != nullptr, "illegal class");
1662 ResourceMark rm(THREAD);
1663 // Return null for arrays and primitives
1664 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1665 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1666 if (k->is_instance_klass()) {
1667 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1668 if (type_annotations != nullptr) {
1669 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1670 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1671 }
1672 }
1673 }
1674 return nullptr;
1675 JVM_END
1676
1677 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1678 assert (method != nullptr, "illegal method");
1679 // method is a handle to a java.lang.reflect.Method object
1680 Method* m = jvm_get_method_common(method);
1681 if (m == nullptr) {
1682 return nullptr;
1683 }
1684
1685 AnnotationArray* type_annotations = m->type_annotations();
1686 if (type_annotations != nullptr) {
1687 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1688 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1689 }
1690
1691 return nullptr;
1692 JVM_END
1693
1694 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1695 assert (field != nullptr, "illegal field");
1696 fieldDescriptor fd;
1697 bool gotFd = jvm_get_field_common(field, fd);
1698 if (!gotFd) {
1699 return nullptr;
1700 }
1701
1702 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1703 JVM_END
1704
1705 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1706 if (!cp->is_within_bounds(index)) {
1707 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1708 }
1709 }
1710
1711 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1712 {
1713 // method is a handle to a java.lang.reflect.Method object
1714 Method* method_ptr = jvm_get_method_common(method);
1715 methodHandle mh (THREAD, method_ptr);
1716 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1717 const int num_params = mh->method_parameters_length();
1718
1719 if (num_params < 0) {
1720 // A -1 return value from method_parameters_length means there is no
1721 // parameter data. Return null to indicate this to the reflection
1722 // API.
1723 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1724 return (jobjectArray)nullptr;
1725 } else {
1726 // Otherwise, we return something up to reflection, even if it is
1727 // a zero-length array. Why? Because in some cases this can
1728 // trigger a MalformedParametersException.
1729
1730 // make sure all the symbols are properly formatted
1731 for (int i = 0; i < num_params; i++) {
1732 MethodParametersElement* params = mh->method_parameters_start();
1733 int index = params[i].name_cp_index;
1734 constantPoolHandle cp(THREAD, mh->constants());
1735 bounds_check(cp, index, CHECK_NULL);
1736
1737 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1738 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1739 "Wrong type at constant pool index");
1740 }
1741
1742 }
1743
1744 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1745 objArrayHandle result (THREAD, result_oop);
1746
1747 for (int i = 0; i < num_params; i++) {
1748 MethodParametersElement* params = mh->method_parameters_start();
1749 // For a 0 index, give a null symbol
1750 Symbol* sym = 0 != params[i].name_cp_index ?
1751 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1752 int flags = params[i].flags;
1753 oop param = Reflection::new_parameter(reflected_method, i, sym,
1754 flags, CHECK_NULL);
1755 result->obj_at_put(i, param);
1756 }
1757 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1758 }
1759 }
1760 JVM_END
1761
1762 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1763
1764 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1765 {
1766 JvmtiVMObjectAllocEventCollector oam;
1767
1768 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1769 // Exclude primitive types and array types
1770 if (java_lang_Class::is_primitive(ofMirror) ||
1771 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1772 // Return empty array
1773 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1774 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1775 }
1776
1777 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1778 constantPoolHandle cp(THREAD, k->constants());
1779
1780 // Ensure class is linked
1781 k->link_class(CHECK_NULL);
1782
1783 // Allocate result
1784 int num_fields;
1785
1786 if (publicOnly) {
1787 num_fields = 0;
1788 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1789 if (fs.access_flags().is_public()) ++num_fields;
1790 }
1791 } else {
1792 num_fields = k->java_fields_count();
1793 }
1794
1795 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1796 objArrayHandle result (THREAD, r);
1797
1798 int out_idx = 0;
1799 fieldDescriptor fd;
1800 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1801 if (!publicOnly || fs.access_flags().is_public()) {
1802 fd.reinitialize(k, fs.to_FieldInfo());
1803 oop field = Reflection::new_field(&fd, CHECK_NULL);
1804 result->obj_at_put(out_idx, field);
1805 ++out_idx;
1806 }
1807 }
1808 assert(out_idx == num_fields, "just checking");
1809 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1810 }
1811 JVM_END
1812
1813 // A class is a record if and only if it is final and a direct subclass of
1814 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1815 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1816 {
1817 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1818 if (k != nullptr && k->is_instance_klass()) {
1819 InstanceKlass* ik = InstanceKlass::cast(k);
1820 return ik->is_record();
1821 } else {
1822 return false;
1823 }
1824 }
1825 JVM_END
1826
1827 // Returns an array containing the components of the Record attribute,
1828 // or null if the attribute is not present.
1829 //
1830 // Note that this function returns the components of the Record attribute
1831 // even if the class is not a record.
1832 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1833 {
1834 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
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 = java_lang_Class::as_InstanceKlass(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(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1955 {
1956 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1957 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1958 return c->has_nestmate_access_to(m, THREAD);
1959 }
1960 JVM_END
1961
1962 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1963 {
1964 // current is not a primitive or array class
1965 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1966 InstanceKlass* host = c->nest_host(THREAD);
1967 return (jclass) (host == nullptr ? nullptr :
1968 JNIHandles::make_local(THREAD, host->java_mirror()));
1969 }
1970 JVM_END
1971
1972 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1973 {
1974 // current is not a primitive or array class
1975 ResourceMark rm(THREAD);
1976 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1977 InstanceKlass* host = c->nest_host(THREAD);
1978
1979 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1980 c->external_name(), host->external_name());
1981 {
1982 JvmtiVMObjectAllocEventCollector oam;
1983 Array<u2>* members = host->nest_members();
1984 int length = members == nullptr ? 0 : members->length();
1985
1986 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1987
1988 // nest host is first in the array so make it one bigger
1989 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL);
1990 refArrayHandle result(THREAD, r);
1991 result->obj_at_put(0, host->java_mirror());
1992 if (length != 0) {
1993 int count = 0;
1994 for (int i = 0; i < length; i++) {
1995 int cp_index = members->at(i);
1996 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1997 if (HAS_PENDING_EXCEPTION) {
1998 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1999 return nullptr; // propagate VMEs
2000 }
2001 if (log_is_enabled(Trace, class, nestmates)) {
2002 stringStream ss;
2003 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2004 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2005 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2006 log_trace(class, nestmates)("%s", ss.as_string());
2007 }
2008 CLEAR_PENDING_EXCEPTION;
2009 continue;
2010 }
2011 if (k->is_instance_klass()) {
2012 InstanceKlass* ik = InstanceKlass::cast(k);
2013 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2014 if (nest_host_k == host) {
2015 result->obj_at_put(count+1, k->java_mirror());
2016 count++;
2017 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2018 } else {
2019 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2020 ik->external_name(), nest_host_k->external_name());
2021 }
2022 } else {
2023 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2024 k->external_name());
2025 }
2026 }
2027 if (count < length) {
2028 // we had invalid entries so we need to compact the array
2029 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2030 length + 1, count + 1);
2031
2032 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2033 count + 1, CHECK_NULL);
2034 objArrayHandle result2(THREAD, r2);
2035 for (int i = 0; i < count + 1; i++) {
2036 result2->obj_at_put(i, result->obj_at(i));
2037 }
2038 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2039 }
2040 }
2041 else {
2042 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2043 }
2044 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2045 }
2046 }
2047 JVM_END
2048
2049 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2050 {
2051 oop mirror = JNIHandles::resolve_non_null(current);
2052 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2053 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2054
2055 ResourceMark rm(THREAD);
2056 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2057 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2058 if (ik->is_sealed()) {
2059 JvmtiVMObjectAllocEventCollector oam;
2060 Array<u2>* subclasses = ik->permitted_subclasses();
2061 int length = subclasses->length();
2062
2063 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2064
2065 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL);
2066 refArrayHandle result(THREAD, r);
2067 int count = 0;
2068 for (int i = 0; i < length; i++) {
2069 int cp_index = subclasses->at(i);
2070 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2071 if (HAS_PENDING_EXCEPTION) {
2072 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2073 return nullptr; // propagate VMEs
2074 }
2075 if (log_is_enabled(Trace, class, sealed)) {
2076 stringStream ss;
2077 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2078 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2079 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2080 log_trace(class, sealed)("%s", ss.as_string());
2081 }
2082
2083 CLEAR_PENDING_EXCEPTION;
2084 continue;
2085 }
2086 if (k->is_instance_klass()) {
2087 result->obj_at_put(count++, k->java_mirror());
2088 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2089 }
2090 }
2091 if (count < length) {
2092 // we had invalid entries so we need to compact the array
2093 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2094 count, CHECK_NULL);
2095 objArrayHandle result2(THREAD, r2);
2096 for (int i = 0; i < count; i++) {
2097 result2->obj_at_put(i, result->obj_at(i));
2098 }
2099 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2100 }
2101 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2102 } else {
2103 return nullptr;
2104 }
2105 }
2106 JVM_END
2107
2108 // Constant pool access //////////////////////////////////////////////////////////
2109
2110 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2111 {
2112 JvmtiVMObjectAllocEventCollector oam;
2113 oop mirror = JNIHandles::resolve_non_null(cls);
2114 // Return null for primitives and arrays
2115 if (!java_lang_Class::is_primitive(mirror)) {
2116 Klass* k = java_lang_Class::as_Klass(mirror);
2117 if (k->is_instance_klass()) {
2118 InstanceKlass* k_h = InstanceKlass::cast(k);
2119 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2120 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2121 return JNIHandles::make_local(THREAD, jcp());
2122 }
2123 }
2124 return nullptr;
2125 }
2126 JVM_END
2127
2128
2129 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2130 {
2131 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2132 return cp->length();
2133 }
2134 JVM_END
2135
2136
2137 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2138 {
2139 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2140 bounds_check(cp, index, CHECK_NULL);
2141 constantTag tag = cp->tag_at(index);
2142 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2143 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2144 }
2145 Klass* k = cp->klass_at(index, CHECK_NULL);
2146 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2147 }
2148 JVM_END
2149
2150 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2151 {
2152 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2153 bounds_check(cp, index, CHECK_NULL);
2154 constantTag tag = cp->tag_at(index);
2155 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2156 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2157 }
2158 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2159 if (k == nullptr) return nullptr;
2160 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2161 }
2162 JVM_END
2163
2164 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2165 constantTag tag = cp->tag_at(index);
2166 if (!tag.is_method() && !tag.is_interface_method()) {
2167 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2168 }
2169 int klass_ref = cp->uncached_klass_ref_index_at(index);
2170 Klass* k_o;
2171 if (force_resolution) {
2172 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2173 } else {
2174 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2175 if (k_o == nullptr) return nullptr;
2176 }
2177 InstanceKlass* k = InstanceKlass::cast(k_o);
2178 Symbol* name = cp->uncached_name_ref_at(index);
2179 Symbol* sig = cp->uncached_signature_ref_at(index);
2180 methodHandle m (THREAD, k->find_method(name, sig));
2181 if (m.is_null()) {
2182 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2183 }
2184 oop method;
2185 if (m->is_object_constructor()) {
2186 method = Reflection::new_constructor(m, CHECK_NULL);
2187 } else {
2188 method = Reflection::new_method(m, true, CHECK_NULL);
2189 }
2190 return JNIHandles::make_local(THREAD, method);
2191 }
2192
2193 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2194 {
2195 JvmtiVMObjectAllocEventCollector oam;
2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2197 bounds_check(cp, index, CHECK_NULL);
2198 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2199 return res;
2200 }
2201 JVM_END
2202
2203 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2204 {
2205 JvmtiVMObjectAllocEventCollector oam;
2206 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2207 bounds_check(cp, index, CHECK_NULL);
2208 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2209 return res;
2210 }
2211 JVM_END
2212
2213 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2214 constantTag tag = cp->tag_at(index);
2215 if (!tag.is_field()) {
2216 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2217 }
2218 int klass_ref = cp->uncached_klass_ref_index_at(index);
2219 Klass* k_o;
2220 if (force_resolution) {
2221 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2222 } else {
2223 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2224 if (k_o == nullptr) return nullptr;
2225 }
2226 InstanceKlass* k = InstanceKlass::cast(k_o);
2227 Symbol* name = cp->uncached_name_ref_at(index);
2228 Symbol* sig = cp->uncached_signature_ref_at(index);
2229 fieldDescriptor fd;
2230 Klass* target_klass = k->find_field(name, sig, &fd);
2231 if (target_klass == nullptr) {
2232 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2233 }
2234 oop field = Reflection::new_field(&fd, CHECK_NULL);
2235 return JNIHandles::make_local(THREAD, field);
2236 }
2237
2238 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2239 {
2240 JvmtiVMObjectAllocEventCollector oam;
2241 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2242 bounds_check(cp, index, CHECK_NULL);
2243 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2244 return res;
2245 }
2246 JVM_END
2247
2248 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2249 {
2250 JvmtiVMObjectAllocEventCollector oam;
2251 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2252 bounds_check(cp, index, CHECK_NULL);
2253 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2254 return res;
2255 }
2256 JVM_END
2257
2258 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2259 {
2260 JvmtiVMObjectAllocEventCollector oam;
2261 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2262 bounds_check(cp, index, CHECK_NULL);
2263 constantTag tag = cp->tag_at(index);
2264 if (!tag.is_field_or_method()) {
2265 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2266 }
2267 int klass_ref = cp->uncached_klass_ref_index_at(index);
2268 Symbol* klass_name = cp->klass_name_at(klass_ref);
2269 Symbol* member_name = cp->uncached_name_ref_at(index);
2270 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2271 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2272 objArrayHandle dest(THREAD, dest_o);
2273 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2274 dest->obj_at_put(0, str());
2275 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2276 dest->obj_at_put(1, str());
2277 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2278 dest->obj_at_put(2, str());
2279 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2280 }
2281 JVM_END
2282
2283 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2284 {
2285 JvmtiVMObjectAllocEventCollector oam;
2286 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2287 bounds_check(cp, index, CHECK_0);
2288 constantTag tag = cp->tag_at(index);
2289 if (!tag.is_field_or_method()) {
2290 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2291 }
2292 return (jint) cp->uncached_klass_ref_index_at(index);
2293 }
2294 JVM_END
2295
2296 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2297 {
2298 JvmtiVMObjectAllocEventCollector oam;
2299 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2300 bounds_check(cp, index, CHECK_0);
2301 constantTag tag = cp->tag_at(index);
2302 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2303 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2304 }
2305 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2306 }
2307 JVM_END
2308
2309 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2310 {
2311 JvmtiVMObjectAllocEventCollector oam;
2312 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2313 bounds_check(cp, index, CHECK_NULL);
2314 constantTag tag = cp->tag_at(index);
2315 if (!tag.is_name_and_type()) {
2316 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2317 }
2318 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2319 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2320 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2321 objArrayHandle dest(THREAD, dest_o);
2322 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2323 dest->obj_at_put(0, str());
2324 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2325 dest->obj_at_put(1, str());
2326 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2327 }
2328 JVM_END
2329
2330 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2331 {
2332 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2333 bounds_check(cp, index, CHECK_0);
2334 constantTag tag = cp->tag_at(index);
2335 if (!tag.is_int()) {
2336 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2337 }
2338 return cp->int_at(index);
2339 }
2340 JVM_END
2341
2342 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2343 {
2344 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2345 bounds_check(cp, index, CHECK_(0L));
2346 constantTag tag = cp->tag_at(index);
2347 if (!tag.is_long()) {
2348 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2349 }
2350 return cp->long_at(index);
2351 }
2352 JVM_END
2353
2354 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2355 {
2356 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2357 bounds_check(cp, index, CHECK_(0.0f));
2358 constantTag tag = cp->tag_at(index);
2359 if (!tag.is_float()) {
2360 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2361 }
2362 return cp->float_at(index);
2363 }
2364 JVM_END
2365
2366 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2367 {
2368 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2369 bounds_check(cp, index, CHECK_(0.0));
2370 constantTag tag = cp->tag_at(index);
2371 if (!tag.is_double()) {
2372 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2373 }
2374 return cp->double_at(index);
2375 }
2376 JVM_END
2377
2378 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2379 {
2380 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2381 bounds_check(cp, index, CHECK_NULL);
2382 constantTag tag = cp->tag_at(index);
2383 if (!tag.is_string()) {
2384 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2385 }
2386 oop str = cp->string_at(index, CHECK_NULL);
2387 return (jstring) JNIHandles::make_local(THREAD, str);
2388 }
2389 JVM_END
2390
2391 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2392 {
2393 JvmtiVMObjectAllocEventCollector oam;
2394 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2395 bounds_check(cp, index, CHECK_NULL);
2396 constantTag tag = cp->tag_at(index);
2397 if (!tag.is_symbol()) {
2398 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2399 }
2400 Symbol* sym = cp->symbol_at(index);
2401 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2402 return (jstring) JNIHandles::make_local(THREAD, str());
2403 }
2404 JVM_END
2405
2406 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2407 {
2408 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2409 bounds_check(cp, index, CHECK_0);
2410 constantTag tag = cp->tag_at(index);
2411 jbyte result = tag.value();
2412 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2413 // they are changed to the corresponding tags from the JVM spec, so that java code in
2414 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2415 if (tag.is_klass_or_reference()) {
2416 result = JVM_CONSTANT_Class;
2417 } else if (tag.is_string_index()) {
2418 result = JVM_CONSTANT_String;
2419 } else if (tag.is_method_type_in_error()) {
2420 result = JVM_CONSTANT_MethodType;
2421 } else if (tag.is_method_handle_in_error()) {
2422 result = JVM_CONSTANT_MethodHandle;
2423 } else if (tag.is_dynamic_constant_in_error()) {
2424 result = JVM_CONSTANT_Dynamic;
2425 }
2426 return result;
2427 }
2428 JVM_END
2429
2430 // Assertion support. //////////////////////////////////////////////////////////
2431
2432 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2433 assert(cls != nullptr, "bad class");
2434
2435 oop r = JNIHandles::resolve(cls);
2436 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2437 if (java_lang_Class::is_primitive(r)) return false;
2438
2439 Klass* k = java_lang_Class::as_Klass(r);
2440 assert(k->is_instance_klass(), "must be an instance klass");
2441 if (!k->is_instance_klass()) return false;
2442
2443 ResourceMark rm(THREAD);
2444 const char* name = k->name()->as_C_string();
2445 bool system_class = k->class_loader() == nullptr;
2446 return JavaAssertions::enabled(name, system_class);
2447
2448 JVM_END
2449
2450
2451 // Return a new AssertionStatusDirectives object with the fields filled in with
2452 // command-line assertion arguments (i.e., -ea, -da).
2453 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2454 JvmtiVMObjectAllocEventCollector oam;
2455 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2456 return JNIHandles::make_local(THREAD, asd);
2457 JVM_END
2458
2459 // Verification ////////////////////////////////////////////////////////////////////////////////
2460
2461 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2462
2463 // RedefineClasses support: bug 6214132 caused verification to fail.
2464 // All functions from this section, unless noted otherwise, should call the functions
2465 // get_klass_considering_redefinition(), or
2466 // get_instance_klass_considering_redefinition()
2467 // These functions return JvmtiThreadState::_scratch_class if the verifier
2468 // was invoked in the middle of the redefinition of cls.
2469 // See jvmtiThreadState.hpp for details.
2470
2471 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2473 if (k->is_instance_klass()) {
2474 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2475 } else {
2476 return k;
2477 }
2478 }
2479
2480 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2481 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2482 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2483 }
2484
2485 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2486 oop mirror = JNIHandles::resolve_non_null(cls);
2487 if (java_lang_Class::is_primitive(mirror)) {
2488 return JNI_FALSE;
2489 }
2490 Klass* k = java_lang_Class::as_Klass(mirror);
2491 // This isn't necessary since answer is the same because redefinition
2492 // has already checked this matches for the scratch class.
2493 // k = get_klass_considering_redefinition(cls, thread)
2494 jboolean result = k->is_interface();
2495 assert(!result || k->is_instance_klass(),
2496 "all interfaces are instance types");
2497 return result;
2498 JVM_END
2499
2500 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2501 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2502 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2503 return k->name()->as_utf8();
2504 JVM_END
2505
2506
2507 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2508 Klass* k = get_klass_considering_redefinition(cls, thread);
2509 // types will have length zero if this is not an InstanceKlass
2510 // (length is determined by call to JVM_GetClassCPEntriesCount)
2511 if (k->is_instance_klass()) {
2512 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2513 for (int index = cp->length() - 1; index >= 0; index--) {
2514 constantTag tag = cp->tag_at(index);
2515 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2516 }
2517 }
2518 JVM_END
2519
2520
2521 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2522 Klass* k = get_klass_considering_redefinition(cls, thread);
2523 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2524 JVM_END
2525
2526
2527 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2528 Klass* k = get_klass_considering_redefinition(cls, thread);
2529 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2530 JVM_END
2531
2532
2533 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2534 Klass* k = get_klass_considering_redefinition(cls, thread);
2535 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2536 JVM_END
2537
2538
2539 // The following methods, used for the verifier, are never called with
2540 // array klasses, so a direct cast to InstanceKlass is safe.
2541 // Typically, these methods are called in a loop with bounds determined
2542 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2543 // zero for arrays.
2544 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2545 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2546 Method* method = ik->methods()->at(method_index);
2547 int length = method->checked_exceptions_length();
2548 if (length > 0) {
2549 CheckedExceptionElement* table= method->checked_exceptions_start();
2550 for (int i = 0; i < length; i++) {
2551 exceptions[i] = table[i].class_cp_index;
2552 }
2553 }
2554 JVM_END
2555
2556
2557 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2558 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2559 Method* method = ik->methods()->at(method_index);
2560 return method->checked_exceptions_length();
2561 JVM_END
2562
2563
2564 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2565 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2566 Method* method = ik->methods()->at(method_index);
2567 memcpy(code, method->code_base(), method->code_size());
2568 JVM_END
2569
2570
2571 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2572 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2573 Method* method = ik->methods()->at(method_index);
2574 return method->code_size();
2575 JVM_END
2576
2577
2578 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2579 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2580 Method* method = ik->methods()->at(method_index);
2581 ExceptionTable extable(method);
2582 entry->start_pc = extable.start_pc(entry_index);
2583 entry->end_pc = extable.end_pc(entry_index);
2584 entry->handler_pc = extable.handler_pc(entry_index);
2585 entry->catchType = extable.catch_type_index(entry_index);
2586 JVM_END
2587
2588
2589 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2590 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2591 Method* method = ik->methods()->at(method_index);
2592 return method->exception_table_length();
2593 JVM_END
2594
2595
2596 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2597 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2598 Method* method = ik->methods()->at(method_index);
2599 return method->access_flags().as_method_flags();
2600 JVM_END
2601
2602
2603 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2604 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2605 return ik->field_access_flags(field_index);
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2610 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2611 Method* method = ik->methods()->at(method_index);
2612 return method->max_locals();
2613 JVM_END
2614
2615
2616 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2617 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2618 Method* method = ik->methods()->at(method_index);
2619 return method->size_of_parameters();
2620 JVM_END
2621
2622
2623 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2624 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2625 Method* method = ik->methods()->at(method_index);
2626 return method->verifier_max_stack();
2627 JVM_END
2628
2629
2630 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2631 ResourceMark rm(THREAD);
2632 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2633 Method* method = ik->methods()->at(method_index);
2634 return method->is_object_constructor();
2635 JVM_END
2636
2637
2638 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2639 ResourceMark rm(THREAD);
2640 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2641 Method* method = ik->methods()->at(method_index);
2642 return method->is_overpass();
2643 JVM_END
2644
2645 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2646 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2647 Method* method = ik->methods()->at(method_index);
2648 return method->name()->as_utf8();
2649 JVM_END
2650
2651
2652 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2653 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2654 Method* method = ik->methods()->at(method_index);
2655 return method->signature()->as_utf8();
2656 JVM_END
2657
2658 /**
2659 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2660 * read entries in the constant pool. Since the old verifier always
2661 * works on a copy of the code, it will not see any rewriting that
2662 * may possibly occur in the middle of verification. So it is important
2663 * that nothing it calls tries to use the cpCache instead of the raw
2664 * constant pool, so we must use cp->uncached_x methods when appropriate.
2665 */
2666 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2667 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2668 ConstantPool* cp = ik->constants();
2669 switch (cp->tag_at(cp_index).value()) {
2670 case JVM_CONSTANT_Fieldref:
2671 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2672 default:
2673 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2674 }
2675 ShouldNotReachHere();
2676 return nullptr;
2677 JVM_END
2678
2679
2680 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2681 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2682 ConstantPool* cp = ik->constants();
2683 switch (cp->tag_at(cp_index).value()) {
2684 case JVM_CONSTANT_InterfaceMethodref:
2685 case JVM_CONSTANT_Methodref:
2686 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2687 default:
2688 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2689 }
2690 ShouldNotReachHere();
2691 return nullptr;
2692 JVM_END
2693
2694
2695 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2696 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2697 ConstantPool* cp = ik->constants();
2698 switch (cp->tag_at(cp_index).value()) {
2699 case JVM_CONSTANT_InterfaceMethodref:
2700 case JVM_CONSTANT_Methodref:
2701 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2702 default:
2703 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2704 }
2705 ShouldNotReachHere();
2706 return nullptr;
2707 JVM_END
2708
2709
2710 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2711 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2712 ConstantPool* cp = ik->constants();
2713 switch (cp->tag_at(cp_index).value()) {
2714 case JVM_CONSTANT_Fieldref:
2715 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2716 default:
2717 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2718 }
2719 ShouldNotReachHere();
2720 return nullptr;
2721 JVM_END
2722
2723
2724 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2725 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2726 ConstantPool* cp = ik->constants();
2727 Symbol* classname = cp->klass_name_at(cp_index);
2728 return classname->as_utf8();
2729 JVM_END
2730
2731
2732 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2733 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2734 ConstantPool* cp = ik->constants();
2735 switch (cp->tag_at(cp_index).value()) {
2736 case JVM_CONSTANT_Fieldref: {
2737 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2738 Symbol* classname = cp->klass_name_at(class_index);
2739 return classname->as_utf8();
2740 }
2741 default:
2742 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2743 }
2744 ShouldNotReachHere();
2745 return nullptr;
2746 JVM_END
2747
2748
2749 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2750 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2751 ConstantPool* cp = ik->constants();
2752 switch (cp->tag_at(cp_index).value()) {
2753 case JVM_CONSTANT_Methodref:
2754 case JVM_CONSTANT_InterfaceMethodref: {
2755 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2756 Symbol* classname = cp->klass_name_at(class_index);
2757 return classname->as_utf8();
2758 }
2759 default:
2760 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2761 }
2762 ShouldNotReachHere();
2763 return nullptr;
2764 JVM_END
2765
2766
2767 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2768 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2769 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2770 ConstantPool* cp = ik->constants();
2771 ConstantPool* cp_called = ik_called->constants();
2772 switch (cp->tag_at(cp_index).value()) {
2773 case JVM_CONSTANT_Fieldref: {
2774 Symbol* name = cp->uncached_name_ref_at(cp_index);
2775 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2776 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2777 if (fs.name() == name && fs.signature() == signature) {
2778 return fs.access_flags().as_field_flags();
2779 }
2780 }
2781 return -1;
2782 }
2783 default:
2784 fatal("JVM_GetCPFieldModifiers: illegal constant");
2785 }
2786 ShouldNotReachHere();
2787 return 0;
2788 JVM_END
2789
2790
2791 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2792 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2793 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2794 ConstantPool* cp = ik->constants();
2795 switch (cp->tag_at(cp_index).value()) {
2796 case JVM_CONSTANT_Methodref:
2797 case JVM_CONSTANT_InterfaceMethodref: {
2798 Symbol* name = cp->uncached_name_ref_at(cp_index);
2799 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2800 Array<Method*>* methods = ik_called->methods();
2801 int methods_count = methods->length();
2802 for (int i = 0; i < methods_count; i++) {
2803 Method* method = methods->at(i);
2804 if (method->name() == name && method->signature() == signature) {
2805 return method->access_flags().as_method_flags();
2806 }
2807 }
2808 return -1;
2809 }
2810 default:
2811 fatal("JVM_GetCPMethodModifiers: illegal constant");
2812 }
2813 ShouldNotReachHere();
2814 return 0;
2815 JVM_END
2816
2817
2818 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2819
2820 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2821 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2822 JVM_END
2823
2824
2825 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2826 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2827 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2828 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2829 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2830 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2831 JVM_END
2832
2833 // Printing support //////////////////////////////////////////////////
2834 extern "C" {
2835
2836 ATTRIBUTE_PRINTF(3, 0)
2837 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2838 // Reject count values that are negative signed values converted to
2839 // unsigned; see bug 4399518, 4417214
2840 if ((intptr_t)count <= 0) return -1;
2841
2842 int result = os::vsnprintf(str, count, fmt, args);
2843 if (result > 0 && (size_t)result >= count) {
2844 result = -1;
2845 }
2846
2847 return result;
2848 }
2849
2850 ATTRIBUTE_PRINTF(3, 4)
2851 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2852 va_list args;
2853 int len;
2854 va_start(args, fmt);
2855 len = jio_vsnprintf(str, count, fmt, args);
2856 va_end(args);
2857 return len;
2858 }
2859
2860 ATTRIBUTE_PRINTF(2, 3)
2861 int jio_fprintf(FILE* f, const char *fmt, ...) {
2862 int len;
2863 va_list args;
2864 va_start(args, fmt);
2865 len = jio_vfprintf(f, fmt, args);
2866 va_end(args);
2867 return len;
2868 }
2869
2870 ATTRIBUTE_PRINTF(2, 0)
2871 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2872 if (Arguments::vfprintf_hook() != nullptr) {
2873 return Arguments::vfprintf_hook()(f, fmt, args);
2874 } else {
2875 return vfprintf(f, fmt, args);
2876 }
2877 }
2878
2879 ATTRIBUTE_PRINTF(1, 2)
2880 JNIEXPORT int jio_printf(const char *fmt, ...) {
2881 int len;
2882 va_list args;
2883 va_start(args, fmt);
2884 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2885 va_end(args);
2886 return len;
2887 }
2888
2889 // HotSpot specific jio method
2890 void jio_print(const char* s, size_t len) {
2891 // Try to make this function as atomic as possible.
2892 if (Arguments::vfprintf_hook() != nullptr) {
2893 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2894 } else {
2895 // Make an unused local variable to avoid warning from gcc compiler.
2896 bool dummy = os::write(defaultStream::output_fd(), s, len);
2897 }
2898 }
2899
2900 } // Extern C
2901
2902 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2903
2904 // In most of the JVM thread support functions we need to access the
2905 // thread through a ThreadsListHandle to prevent it from exiting and
2906 // being reclaimed while we try to operate on it. The exceptions to this
2907 // rule are when operating on the current thread, or if the monitor of
2908 // the target java.lang.Thread is locked at the Java level - in both
2909 // cases the target cannot exit.
2910
2911 static void thread_entry(JavaThread* thread, TRAPS) {
2912 HandleMark hm(THREAD);
2913 Handle obj(THREAD, thread->threadObj());
2914 JavaValue result(T_VOID);
2915 JavaCalls::call_virtual(&result,
2916 obj,
2917 vmClasses::Thread_klass(),
2918 vmSymbols::run_method_name(),
2919 vmSymbols::void_method_signature(),
2920 THREAD);
2921 }
2922
2923
2924 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2925 #if INCLUDE_CDS
2926 if (CDSConfig::allow_only_single_java_thread()) {
2927 // During java -Xshare:dump, if we allow multiple Java threads to
2928 // execute in parallel, symbols and classes may be loaded in
2929 // random orders which will make the resulting CDS archive
2930 // non-deterministic.
2931 //
2932 // Lucikly, during java -Xshare:dump, it's important to run only
2933 // the code in the main Java thread (which is NOT started here) that
2934 // creates the module graph, etc. It's safe to not start the other
2935 // threads which are launched by class static initializers
2936 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2937 if (log_is_enabled(Info, aot)) {
2938 ResourceMark rm;
2939 oop t = JNIHandles::resolve_non_null(jthread);
2940 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2941 }
2942 return;
2943 }
2944 #endif
2945 JavaThread *native_thread = nullptr;
2946
2947 // We cannot hold the Threads_lock when we throw an exception,
2948 // due to rank ordering issues. Example: we might need to grab the
2949 // Heap_lock while we construct the exception.
2950 bool throw_illegal_thread_state = false;
2951
2952 // We must release the Threads_lock before we can post a jvmti event
2953 // in Thread::start.
2954 {
2955 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2956 // Ensure that the C++ Thread and OSThread structures aren't freed before
2957 // we operate.
2958 MutexLocker ml(Threads_lock);
2959
2960 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2961 // re-starting an already started thread, so we should usually find
2962 // that the JavaThread is null. However for a JNI attached thread
2963 // there is a small window between the Thread object being created
2964 // (with its JavaThread set) and the update to its threadStatus, so we
2965 // have to check for this
2966 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2967 throw_illegal_thread_state = true;
2968 } else {
2969 jlong size =
2970 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2971 // Allocate the C++ Thread structure and create the native thread. The
2972 // stack size retrieved from java is 64-bit signed, but the constructor takes
2973 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2974 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2975 // - Avoid passing negative values which would result in really large stacks.
2976 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2977 size_t sz = size > 0 ? (size_t) size : 0;
2978 native_thread = new JavaThread(&thread_entry, sz);
2979
2980 // At this point it may be possible that no osthread was created for the
2981 // JavaThread due to lack of memory. Check for this situation and throw
2982 // an exception if necessary. Eventually we may want to change this so
2983 // that we only grab the lock if the thread was created successfully -
2984 // then we can also do this check and throw the exception in the
2985 // JavaThread constructor.
2986 if (native_thread->osthread() != nullptr) {
2987 // Note: the current thread is not being used within "prepare".
2988 native_thread->prepare(jthread);
2989 }
2990 }
2991 }
2992
2993 if (throw_illegal_thread_state) {
2994 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2995 }
2996
2997 assert(native_thread != nullptr, "Starting null thread?");
2998
2999 if (native_thread->osthread() == nullptr) {
3000 ResourceMark rm(thread);
3001 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3002 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3003 // No one should hold a reference to the 'native_thread'.
3004 native_thread->smr_delete();
3005 if (JvmtiExport::should_post_resource_exhausted()) {
3006 JvmtiExport::post_resource_exhausted(
3007 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3008 os::native_thread_creation_failed_msg());
3009 }
3010 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3011 os::native_thread_creation_failed_msg());
3012 }
3013
3014 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3015
3016 Thread::start(native_thread);
3017
3018 JVM_END
3019
3020
3021 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3022 ThreadsListHandle tlh(thread);
3023 oop java_thread = nullptr;
3024 JavaThread* receiver = nullptr;
3025 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3026 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3027
3028 if (is_alive) {
3029 // jthread refers to a live JavaThread.
3030 Thread::set_priority(receiver, (ThreadPriority)prio);
3031 }
3032 // Implied else: If the JavaThread hasn't started yet, then the
3033 // priority set in the java.lang.Thread object above will be pushed
3034 // down when it does start.
3035 JVM_END
3036
3037
3038 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3039 HOTSPOT_THREAD_YIELD();
3040 os::naked_yield();
3041 JVM_END
3042
3043 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3044 if (nanos < 0) {
3045 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3046 }
3047
3048 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3049 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3050 }
3051
3052 // Save current thread state and restore it at the end of this block.
3053 // And set new thread state to SLEEPING.
3054 JavaThreadSleepState jtss(thread);
3055
3056 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3057
3058 if (nanos == 0) {
3059 os::naked_yield();
3060 } else {
3061 ThreadState old_state = thread->osthread()->get_state();
3062 thread->osthread()->set_state(SLEEPING);
3063 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3064 // An asynchronous exception could have been thrown on
3065 // us while we were sleeping. We do not overwrite those.
3066 if (!HAS_PENDING_EXCEPTION) {
3067 HOTSPOT_THREAD_SLEEP_END(1);
3068 if (!thread->has_async_exception_condition()) {
3069 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3070 // to properly restore the thread state. That's likely wrong.
3071 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3072 }
3073 }
3074 }
3075 thread->osthread()->set_state(old_state);
3076 }
3077 HOTSPOT_THREAD_SLEEP_END(0);
3078 JVM_END
3079
3080 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3081 oop jthread = thread->threadObj();
3082 assert(jthread != nullptr, "no current carrier thread!");
3083 return JNIHandles::make_local(THREAD, jthread);
3084 JVM_END
3085
3086 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3087 oop theThread = thread->vthread();
3088 assert(theThread != (oop)nullptr, "no current thread!");
3089 return JNIHandles::make_local(THREAD, theThread);
3090 JVM_END
3091
3092 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3093 jobject theThread))
3094 oop threadObj = JNIHandles::resolve(theThread);
3095 thread->set_vthread(threadObj);
3096
3097 // Set _monitor_owner_id of new current Thread
3098 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3099
3100 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3101 JVM_END
3102
3103 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3104 return ThreadIdentifier::unsafe_offset();
3105 JVM_END
3106
3107 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3108 ThreadsListHandle tlh(thread);
3109 JavaThread* receiver = nullptr;
3110 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3111 if (is_alive) {
3112 // jthread refers to a live JavaThread.
3113 receiver->interrupt();
3114 }
3115 JVM_END
3116
3117 // Return true iff the current thread has locked the object passed in
3118
3119 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3120 if (obj == nullptr) {
3121 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3122 }
3123 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3124 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3125 JVM_END
3126
3127 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3128 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3129 return (jobjectArray) JNIHandles::make_local(THREAD, trace);
3130 JVM_END
3131
3132 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3133 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3134 return JNIHandles::make_local(THREAD, snapshot);
3135 JVM_END
3136
3137 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3138 // We don't use a ThreadsListHandle here because the current thread
3139 // must be alive.
3140 oop java_thread = JNIHandles::resolve_non_null(jthread);
3141 JavaThread* thr = java_lang_Thread::thread(java_thread);
3142 if (thread == thr && !thr->has_attached_via_jni()) {
3143 // Thread naming is only supported for the current thread and
3144 // we don't set the name of an attached thread to avoid stepping
3145 // on other programs.
3146 ResourceMark rm(thread);
3147 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3148 os::set_native_thread_name(thread_name);
3149 }
3150 JVM_END
3151
3152 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3153 oop theCache = thread->scopedValueCache();
3154 return JNIHandles::make_local(THREAD, theCache);
3155 JVM_END
3156
3157 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3158 jobject theCache))
3159 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3160 thread->set_scopedValueCache(objs);
3161 JVM_END
3162
3163
3164 // java.lang.Package ////////////////////////////////////////////////////////////////
3165
3166
3167 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3168 ResourceMark rm(THREAD);
3169 JvmtiVMObjectAllocEventCollector oam;
3170 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3171 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3172 return (jstring) JNIHandles::make_local(THREAD, result);
3173 JVM_END
3174
3175
3176 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3177 JvmtiVMObjectAllocEventCollector oam;
3178 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3179 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3180 JVM_END
3181
3182
3183 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3184
3185
3186 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3187 MonitorLocker ml(Heap_lock);
3188 oop ref = Universe::reference_pending_list();
3189 if (ref != nullptr) {
3190 Universe::clear_reference_pending_list();
3191 }
3192 return JNIHandles::make_local(THREAD, ref);
3193 JVM_END
3194
3195 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3196 MonitorLocker ml(Heap_lock);
3197 return Universe::has_reference_pending_list();
3198 JVM_END
3199
3200 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3201 MonitorLocker ml(Heap_lock);
3202 while (!Universe::has_reference_pending_list()) {
3203 ml.wait();
3204 }
3205 JVM_END
3206
3207 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3208 oop ref_oop = JNIHandles::resolve_non_null(ref);
3209 // PhantomReference has its own implementation of get().
3210 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3211 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3212 return JNIHandles::make_local(THREAD, referent);
3213 JVM_END
3214
3215 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3216 oop ref_oop = JNIHandles::resolve_non_null(ref);
3217 // PhantomReference has its own implementation of refersTo().
3218 // See: JVM_PhantomReferenceRefersTo
3219 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3220 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3221 return referent == JNIHandles::resolve(o);
3222 JVM_END
3223
3224 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3225 oop ref_oop = JNIHandles::resolve_non_null(ref);
3226 // FinalReference has it's own implementation of clear().
3227 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3228 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3229 // If the referent has already been cleared then done.
3230 // However, if the referent is dead but has not yet been cleared by
3231 // concurrent reference processing, it should NOT be cleared here.
3232 // Instead, clearing should be left to the GC. Clearing it here could
3233 // detectably lose an expected notification, which is impossible with
3234 // STW reference processing. The clearing in enqueue() doesn't have
3235 // this problem, since the enqueue covers the notification, but it's not
3236 // worth the effort to handle that case specially.
3237 return;
3238 }
3239 java_lang_ref_Reference::clear_referent(ref_oop);
3240 JVM_END
3241
3242
3243 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3244
3245
3246 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3247 oop ref_oop = JNIHandles::resolve_non_null(ref);
3248 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3249 return referent == JNIHandles::resolve(o);
3250 JVM_END
3251
3252
3253 // ObjectInputStream ///////////////////////////////////////////////////////////////
3254
3255 // Return the first user-defined class loader up the execution stack, or null
3256 // if only code from the bootstrap or platform class loader is on the stack.
3257
3258 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3259 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3260 InstanceKlass* ik = vfst.method()->method_holder();
3261 oop loader = ik->class_loader();
3262 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3263 return JNIHandles::make_local(THREAD, loader);
3264 }
3265 }
3266 return nullptr;
3267 JVM_END
3268
3269
3270 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3271
3272
3273 // resolve array handle and check arguments
3274 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3275 if (arr == nullptr) {
3276 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3277 }
3278 oop a = JNIHandles::resolve_non_null(arr);
3279 if (!a->is_array()) {
3280 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3281 } else if (type_array_only && !a->is_typeArray()) {
3282 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3283 }
3284 return arrayOop(a);
3285 }
3286
3287
3288 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3289 arrayOop a = check_array(env, arr, false, CHECK_0);
3290 return a->length();
3291 JVM_END
3292
3293
3294 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3295 JvmtiVMObjectAllocEventCollector oam;
3296 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3297 jvalue value;
3298 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3299 oop box = Reflection::box(&value, type, CHECK_NULL);
3300 return JNIHandles::make_local(THREAD, box);
3301 JVM_END
3302
3303
3304 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3305 jvalue value;
3306 value.i = 0; // to initialize value before getting used in CHECK
3307 arrayOop a = check_array(env, arr, true, CHECK_(value));
3308 assert(a->is_typeArray(), "just checking");
3309 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3310 BasicType wide_type = (BasicType) wCode;
3311 if (type != wide_type) {
3312 Reflection::widen(&value, type, wide_type, CHECK_(value));
3313 }
3314 return value;
3315 JVM_END
3316
3317
3318 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3319 arrayOop a = check_array(env, arr, false, CHECK);
3320 oop box = JNIHandles::resolve(val);
3321 jvalue value;
3322 value.i = 0; // to initialize value before getting used in CHECK
3323 BasicType value_type;
3324 if (a->is_objArray()) {
3325 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3326 value_type = Reflection::unbox_for_regular_object(box, &value);
3327 } else {
3328 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3329 }
3330 Reflection::array_set(&value, a, index, value_type, CHECK);
3331 JVM_END
3332
3333
3334 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3335 arrayOop a = check_array(env, arr, true, CHECK);
3336 assert(a->is_typeArray(), "just checking");
3337 BasicType value_type = (BasicType) vCode;
3338 Reflection::array_set(&v, a, index, value_type, CHECK);
3339 JVM_END
3340
3341
3342 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3343 JvmtiVMObjectAllocEventCollector oam;
3344 oop element_mirror = JNIHandles::resolve(eltClass);
3345 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3346 return JNIHandles::make_local(THREAD, result);
3347 JVM_END
3348
3349
3350 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3351 JvmtiVMObjectAllocEventCollector oam;
3352 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3353 oop element_mirror = JNIHandles::resolve(eltClass);
3354 assert(dim_array->is_typeArray(), "just checking");
3355 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3356 return JNIHandles::make_local(THREAD, result);
3357 JVM_END
3358
3359
3360 // Library support ///////////////////////////////////////////////////////////////////////////
3361
3362 JVM_LEAF(void*, JVM_LoadZipLibrary())
3363 return ZipLibrary::handle();
3364 JVM_END
3365
3366 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3367 //%note jvm_ct
3368 char ebuf[1024];
3369 void *load_result;
3370 {
3371 ThreadToNativeFromVM ttnfvm(thread);
3372 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3373 }
3374 if (load_result == nullptr) {
3375 if (throwException) {
3376 char msg[1024];
3377 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3378 // Since 'ebuf' may contain a string encoded using
3379 // platform encoding scheme, we need to pass
3380 // Exceptions::unsafe_to_utf8 to the new_exception method
3381 // as the last argument. See bug 6367357.
3382 Handle h_exception =
3383 Exceptions::new_exception(thread,
3384 vmSymbols::java_lang_UnsatisfiedLinkError(),
3385 msg, Exceptions::unsafe_to_utf8);
3386
3387 THROW_HANDLE_NULL(h_exception);
3388 } else {
3389 log_info(library)("Failed to load library %s", name);
3390 return load_result;
3391 }
3392 }
3393 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3394 return load_result;
3395 JVM_END
3396
3397
3398 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3399 os::dll_unload(handle);
3400 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3401 JVM_END
3402
3403
3404 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3405 void* find_result = os::dll_lookup(handle, name);
3406 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3407 find_result != nullptr ? "Found" : "Failed to find",
3408 name, p2i(handle));
3409 return find_result;
3410 JVM_END
3411
3412
3413 // JNI version ///////////////////////////////////////////////////////////////////////////////
3414
3415 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3416 return Threads::is_supported_jni_version_including_1_1(version);
3417 JVM_END
3418
3419
3420 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3421 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3422 JVM_END
3423
3424 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3425 return Arguments::is_valhalla_enabled() ? JNI_TRUE : JNI_FALSE;
3426 JVM_END
3427
3428 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3429 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3430 JVM_END
3431
3432 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3433 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3434 JVM_END
3435
3436 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3437 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3438 JVM_END
3439
3440 // String support ///////////////////////////////////////////////////////////////////////////
3441
3442 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3443 JvmtiVMObjectAllocEventCollector oam;
3444 if (str == nullptr) return nullptr;
3445 oop string = JNIHandles::resolve_non_null(str);
3446 oop result = StringTable::intern(string, CHECK_NULL);
3447 return (jstring) JNIHandles::make_local(THREAD, result);
3448 JVM_END
3449
3450
3451 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3452
3453 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3454 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3455 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3456 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3457 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3458 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3459
3460
3461 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3462 VM_Exit::block_if_vm_exited();
3463 return new PlatformMutex();
3464 }
3465
3466
3467 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3468 VM_Exit::block_if_vm_exited();
3469 delete ((PlatformMutex*) mon);
3470 }
3471
3472
3473 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3474 VM_Exit::block_if_vm_exited();
3475 ((PlatformMutex*) mon)->lock();
3476 return 0;
3477 }
3478
3479
3480 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3481 VM_Exit::block_if_vm_exited();
3482 ((PlatformMutex*) mon)->unlock();
3483 }
3484
3485
3486 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3487
3488 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3489 Handle loader, jboolean throwError, TRAPS) {
3490 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3491
3492 // Check if we should initialize the class
3493 if (init && klass->is_instance_klass()) {
3494 klass->initialize(CHECK_NULL);
3495 }
3496 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3497 }
3498
3499
3500 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3501
3502 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3503 Handle method_handle;
3504 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3505 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3506 Handle receiver(THREAD, JNIHandles::resolve(obj));
3507 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3508 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3509
3510 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3511 jobject res = JNIHandles::make_local(THREAD, result);
3512 if (JvmtiExport::should_post_vm_object_alloc()) {
3513 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3514 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3515 if (java_lang_Class::is_primitive(ret_type)) {
3516 // Only for primitive type vm allocates memory for java object.
3517 // See box() method.
3518 JvmtiExport::post_vm_object_alloc(thread, result);
3519 }
3520 }
3521 return res;
3522 } else {
3523 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3524 }
3525 JVM_END
3526
3527
3528 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3529 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3530 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3531 oop constructor_mirror = JNIHandles::resolve(c);
3532 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3533 jobject res = JNIHandles::make_local(THREAD, result);
3534 if (JvmtiExport::should_post_vm_object_alloc()) {
3535 JvmtiExport::post_vm_object_alloc(thread, result);
3536 }
3537 return res;
3538 JVM_END
3539
3540 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3541 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3542 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3543 JVM_END
3544
3545 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3546 jclass caller,
3547 jstring interfaceMethodName,
3548 jobject factoryType,
3549 jobject interfaceMethodType,
3550 jobject implementationMember,
3551 jobject dynamicMethodType,
3552 jclass lambdaProxyClass))
3553 #if INCLUDE_CDS
3554 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3555 return;
3556 }
3557
3558 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3559 if (caller_ik->is_hidden()) {
3560 // Hidden classes not of type lambda proxy classes are currently not being archived.
3561 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3562 // registered for archiving.
3563 return;
3564 }
3565 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3566 assert(lambda_ik->is_hidden(), "must be a hidden class");
3567 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3568
3569 Symbol* interface_method_name = nullptr;
3570 if (interfaceMethodName != nullptr) {
3571 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3572 }
3573 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3574 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3575
3576 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3577 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3578
3579 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3580 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3581 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3582
3583 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3584 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3585
3586 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3587 interface_method_type, m, dynamic_method_type, THREAD);
3588 #endif // INCLUDE_CDS
3589 JVM_END
3590
3591 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3592 jclass caller,
3593 jstring interfaceMethodName,
3594 jobject factoryType,
3595 jobject interfaceMethodType,
3596 jobject implementationMember,
3597 jobject dynamicMethodType))
3598 #if INCLUDE_CDS
3599
3600 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3601 implementationMember == nullptr || dynamicMethodType == nullptr) {
3602 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3603 }
3604
3605 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3606 if (!caller_ik->in_aot_cache()) {
3607 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3608 return nullptr;
3609 }
3610
3611 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3612 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3613 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3614
3615 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3616 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3617
3618 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3619 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3620 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3621
3622 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3623 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3624
3625 InstanceKlass* loaded_lambda =
3626 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3627 interface_method_type, m, dynamic_method_type,
3628 CHECK_(nullptr));
3629 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3630 #else
3631 return nullptr;
3632 #endif // INCLUDE_CDS
3633 JVM_END
3634
3635 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3636 if (CDSConfig::is_dumping_static_archive()) {
3637 // We do this so that the default CDS archive can be deterministic.
3638 const char* release = VM_Version::vm_release();
3639 const char* dbg_level = VM_Version::jdk_debug_level();
3640 const char* version = VM_Version::internal_vm_info_string();
3641 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3642 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3643 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3644 seed += (jlong)VM_Version::vm_major_version();
3645 seed += (jlong)VM_Version::vm_minor_version();
3646 seed += (jlong)VM_Version::vm_security_version();
3647 seed += (jlong)VM_Version::vm_patch_version();
3648 if (seed == 0) { // don't let this ever be zero.
3649 seed = 0x87654321;
3650 }
3651 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3652 return seed;
3653 } else {
3654 return 0;
3655 }
3656 JVM_END
3657
3658 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3659 return CDSConfig::get_status();
3660 JVM_END
3661
3662 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3663 #if INCLUDE_CDS
3664 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3665 if (line != nullptr) {
3666 ResourceMark rm(THREAD);
3667 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3668 char* c_line = java_lang_String::as_utf8_string(h_line());
3669 if (CDSConfig::is_dumping_dynamic_archive()) {
3670 // Note: LambdaFormInvokers::append take same format which is not
3671 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3672 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3673 }
3674 if (ClassListWriter::is_enabled()) {
3675 ClassListWriter w;
3676 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3677 }
3678 }
3679 #endif // INCLUDE_CDS
3680 JVM_END
3681
3682 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3683 #if INCLUDE_CDS
3684 ResourceMark rm(THREAD);
3685 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3686 char* file_name = java_lang_String::as_utf8_string(file_handle());
3687 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3688 #endif // INCLUDE_CDS
3689 JVM_END
3690
3691 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3692 #if INCLUDE_CDS
3693 ResourceMark rm(THREAD);
3694 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3695 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3696 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3697 #endif // INCLUDE_CDS
3698 JVM_END
3699
3700 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3701 #if INCLUDE_CDS
3702 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3703 if (!k->is_instance_klass()) {
3704 return false;
3705 } else {
3706 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3707 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3708 // This class will be cached in AOT-initialized state. No need for init barriers.
3709 return false;
3710 } else {
3711 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3712 // must emit barriers to ensure class initialization during production run.
3713 ResourceMark rm(THREAD);
3714 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3715 return true;
3716 }
3717 }
3718 #else
3719 return false;
3720 #endif // INCLUDE_CDS
3721 JVM_END
3722
3723 // Returns an array of all live Thread objects (VM internal JavaThreads,
3724 // jvmti agent threads, and JNI attaching threads are skipped)
3725 // See CR 6404306 regarding JNI attaching threads
3726 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3727 ResourceMark rm(THREAD);
3728 ThreadsListEnumerator tle(THREAD, false, false);
3729 JvmtiVMObjectAllocEventCollector oam;
3730
3731 int num_threads = tle.num_threads();
3732 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3733 objArrayHandle threads_ah(THREAD, r);
3734
3735 for (int i = 0; i < num_threads; i++) {
3736 Handle h = tle.get_threadObj(i);
3737 threads_ah->obj_at_put(i, h());
3738 }
3739
3740 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3741 JVM_END
3742
3743
3744 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3745 // Return StackTraceElement[][], each element is the stack trace of a thread in
3746 // the corresponding entry in the given threads array
3747 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3748 JvmtiVMObjectAllocEventCollector oam;
3749
3750 // Check if threads is null
3751 if (threads == nullptr) {
3752 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3753 }
3754
3755 refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads));
3756 refArrayHandle ah(THREAD, a);
3757 int num_threads = ah->length();
3758 // check if threads is non-empty array
3759 if (num_threads == 0) {
3760 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3761 }
3762
3763 // check if threads is not an array of objects of Thread class
3764 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3765 if (k != vmClasses::Thread_klass()) {
3766 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3767 }
3768
3769 ResourceMark rm(THREAD);
3770
3771 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3772 for (int i = 0; i < num_threads; i++) {
3773 oop thread_obj = ah->obj_at(i);
3774 instanceHandle h(THREAD, (instanceOop) thread_obj);
3775 thread_handle_array->append(h);
3776 }
3777
3778 // The JavaThread references in thread_handle_array are validated
3779 // in VM_ThreadDump::doit().
3780 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3781 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3782
3783 JVM_END
3784
3785 // JVM monitoring and management support
3786 JVM_LEAF(void*, JVM_GetManagement(jint version))
3787 return Management::get_jmm_interface(version);
3788 JVM_END
3789
3790 // com.sun.tools.attach.VirtualMachine agent properties support
3791 //
3792 // Initialize the agent properties with the properties maintained in the VM
3793 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3794 ResourceMark rm;
3795
3796 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3797
3798 PUTPROP(props, "sun.java.command", Arguments::java_command());
3799 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3800 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3801 return properties;
3802 JVM_END
3803
3804 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3805 {
3806 JvmtiVMObjectAllocEventCollector oam;
3807
3808 if (ofClass == nullptr) {
3809 return nullptr;
3810 }
3811 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3812 // Special handling for primitive objects
3813 if (java_lang_Class::is_primitive(mirror())) {
3814 return nullptr;
3815 }
3816 Klass* k = java_lang_Class::as_Klass(mirror());
3817 if (!k->is_instance_klass()) {
3818 return nullptr;
3819 }
3820 InstanceKlass* ik = InstanceKlass::cast(k);
3821 int encl_method_class_idx = ik->enclosing_method_class_index();
3822 if (encl_method_class_idx == 0) {
3823 return nullptr;
3824 }
3825 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3826 objArrayHandle dest(THREAD, dest_o);
3827 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3828 dest->obj_at_put(0, enc_k->java_mirror());
3829 int encl_method_method_idx = ik->enclosing_method_method_index();
3830 if (encl_method_method_idx != 0) {
3831 Symbol* sym = ik->constants()->symbol_at(
3832 extract_low_short_from_int(
3833 ik->constants()->name_and_type_at(encl_method_method_idx)));
3834 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3835 dest->obj_at_put(1, str());
3836 sym = ik->constants()->symbol_at(
3837 extract_high_short_from_int(
3838 ik->constants()->name_and_type_at(encl_method_method_idx)));
3839 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3840 dest->obj_at_put(2, str());
3841 }
3842 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3843 }
3844 JVM_END
3845
3846 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3847 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3848 ResourceMark rm(THREAD);
3849
3850 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3851 return nullptr;
3852 }
3853
3854 char** vm_flags = Arguments::jvm_flags_array();
3855 char** vm_args = Arguments::jvm_args_array();
3856 int num_flags = Arguments::num_jvm_flags();
3857 int num_args = Arguments::num_jvm_args();
3858
3859 InstanceKlass* ik = vmClasses::String_klass();
3860 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3861 objArrayHandle result_h(THREAD, r);
3862
3863 int index = 0;
3864 for (int j = 0; j < num_flags; j++, index++) {
3865 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3866 result_h->obj_at_put(index, h());
3867 }
3868 for (int i = 0; i < num_args; i++, index++) {
3869 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3870 result_h->obj_at_put(index, h());
3871 }
3872 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3873 JVM_END
3874
3875 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3876 return os::get_signal_number(name);
3877 JVM_END
3878
3879 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread))
3880 oop vt = JNIHandles::resolve_external_guard(vthread);
3881 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/);
3882 JVM_END
3883
3884 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread))
3885 oop vt = JNIHandles::resolve_external_guard(vthread);
3886 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/);
3887 JVM_END
3888
3889 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3890 oop vt = JNIHandles::resolve_external_guard(vthread);
3891 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/);
3892 JVM_END
3893
3894 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3895 oop vt = JNIHandles::resolve_external_guard(vthread);
3896 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/);
3897 JVM_END
3898
3899 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3900 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3901 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3902 #if INCLUDE_JVMTI
3903 if (!DoJVMTIVirtualThreadTransitions) {
3904 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3905 return;
3906 }
3907 assert(thread->is_disable_suspend() != (bool)enter,
3908 "nested or unbalanced monitor enter/exit is not allowed");
3909 thread->toggle_is_disable_suspend();
3910 #endif
3911 JVM_END
3912
3913 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3914 #if INCLUDE_JFR
3915 freeze_result result = THREAD->last_freeze_fail_result();
3916 assert(result != freeze_ok, "sanity check");
3917 EventVirtualThreadPinned event(UNTIMED);
3918 event.set_starttime(THREAD->last_freeze_fail_time());
3919 if (event.should_commit()) {
3920 ResourceMark rm(THREAD);
3921 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3922 THREAD->post_vthread_pinned_event(&event, str, result);
3923 }
3924 #endif
3925 JVM_END
3926
3927 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3928 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3929 assert(parkEvent != nullptr, "not initialized");
3930
3931 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3932 oop vthread_head = nullptr;
3933 while (true) {
3934 if (list_head.peek() != nullptr) {
3935 for (;;) {
3936 oop head = list_head.resolve();
3937 if (list_head.cmpxchg(head, nullptr) == head) {
3938 return JNIHandles::make_local(THREAD, head);
3939 }
3940 }
3941 }
3942 ThreadBlockInVM tbivm(THREAD);
3943 parkEvent->park();
3944 }
3945 JVM_END
3946
3947 /*
3948 * Return the current class's class file version. The low order 16 bits of the
3949 * returned jint contain the class's major version. The high order 16 bits
3950 * contain the class's minor version.
3951 */
3952 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3953 oop mirror = JNIHandles::resolve_non_null(current);
3954 if (java_lang_Class::is_primitive(mirror)) {
3955 // return latest major version and minor version of 0.
3956 return JVM_CLASSFILE_MAJOR_VERSION;
3957 }
3958 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3959 return (ik->minor_version() << 16) | ik->major_version();
3960 JVM_END
3961
3962 /*
3963 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3964 * get the value will see a materialized value and not a scalar-replaced
3965 * null value.
3966 */
3967 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3968 JVM_EnsureMaterializedForStackWalk(env, value);
3969 JVM_END
3970
3971 /*
3972 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3973 */
3974 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3975 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3976 JVM_END