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