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 = oopFactory::new_flatArray(fak, len, CHECK_NULL);
465 assert(!ak->is_null_free_array_klass() || copy_len == len,
466 "Failed to throw the IllegalArgumentException");
467 if (copy_len != 0) {
468 int start = MIN2(from, org_length - 1);
469 FlatArrayPayload src_payload(flatArrayOop(oh()), start, fak);
470 FlatArrayPayload dst_payload(dst, 0, fak);
471 int end = to < oh()->length() ? to : oh()->length();
472 for (int i = from; i < end; i++) {
473 // Copy a value
474 src_payload.copy_to(dst_payload);
475
476 // Advance to the next element
477 src_payload.next_element();
478 dst_payload.next_element();
479 }
480 }
481 array = dst;
482 } else {
483 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(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 if (fak->element_klass()->is_naturally_atomic()) {
596 return true;
597 }
598
599 return false;
600 }
601
602 ShouldNotReachHere();
603 JVM_END
604
605 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
606
607 extern volatile jint vm_created;
608
609 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
610 EventShutdown event;
611 if (event.should_commit()) {
612 event.set_reason("Shutdown requested from Java");
613 event.commit();
614 }
615 JVM_END
616
617
618 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
619 before_exit(thread, true);
620 vm_exit(code);
621 JVM_END
622
623
624 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
625 if (!DisableExplicitGC) {
626 EventSystemGC event;
627 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
628 Universe::heap()->collect(GCCause::_java_lang_system_gc);
629 event.commit();
630 }
631 JVM_END
632
633
634 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
635 return Universe::heap()->millis_since_last_whole_heap_examined();
636 JVM_END
637
638
639 static inline jlong convert_size_t_to_jlong(size_t val) {
640 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
641 NOT_LP64 (return (jlong)val;)
642 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
643 }
644
645 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
646 size_t n = Universe::heap()->capacity();
647 return convert_size_t_to_jlong(n);
648 JVM_END
649
650
651 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
652 size_t n = Universe::heap()->unused();
653 return convert_size_t_to_jlong(n);
654 JVM_END
655
656
657 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
658 size_t n = Universe::heap()->max_capacity();
659 return convert_size_t_to_jlong(n);
660 JVM_END
661
662
663 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
664 return os::active_processor_count();
665 JVM_END
666
667 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
668 #ifdef LINUX
669 if (UseContainerSupport) {
670 return JNI_TRUE;
671 }
672 #endif
673 return JNI_FALSE;
674 JVM_END
675
676 JVM_LEAF(jboolean, JVM_IsContainerized(void))
677 if (os::is_containerized()) {
678 return JNI_TRUE;
679 }
680 return JNI_FALSE;
681 JVM_END
682
683 // java.lang.Throwable //////////////////////////////////////////////////////
684
685 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
686 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
687 java_lang_Throwable::fill_in_stack_trace(exception);
688 JVM_END
689
690 // java.lang.NullPointerException ///////////////////////////////////////////
691
692 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
693 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
694
695 oop exc = JNIHandles::resolve_non_null(throwable);
696
697 Method* method;
698 int bci;
699 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
700 return nullptr;
701 }
702 if (method->is_native()) {
703 return nullptr;
704 }
705
706 stringStream ss;
707 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
708 if (ok) {
709 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
710 return (jstring) JNIHandles::make_local(THREAD, result);
711 } else {
712 return nullptr;
713 }
714 JVM_END
715
716 // java.lang.StackTraceElement //////////////////////////////////////////////
717
718
719 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
720 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
721 refArrayOop st = refArrayOop(JNIHandles::resolve(elements));
722 refArrayHandle stack_trace(THREAD, st);
723 // Fill in the allocated stack trace
724 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
725 JVM_END
726
727
728 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
729 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
730 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
731 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
732 JVM_END
733
734
735 // java.lang.StackWalker //////////////////////////////////////////////////////
736 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
737 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
738
739 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
740 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
741 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
742 if (!have_name) {
743 oop name = StringTable::intern(method->name(), CHECK);
744 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
745 }
746 if (!have_type) {
747 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
748 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
749 }
750 JVM_END
751
752 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
753 jint skip_frames, jobject contScope, jobject cont,
754 jint buffer_size, jint start_index, jobjectArray frames))
755 if (!thread->has_last_Java_frame()) {
756 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
757 }
758
759 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
760 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
761 Handle cont_h(THREAD, JNIHandles::resolve(cont));
762 // frames array is a ClassFrameInfo[] array when only getting caller reference,
763 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
764 // be null.
765 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
766 refArrayHandle frames_array_h(THREAD, fa);
767
768 if (frames_array_h->length() < buffer_size) {
769 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
770 }
771
772 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
773 buffer_size, start_index, frames_array_h, CHECK_NULL);
774 return JNIHandles::make_local(THREAD, result);
775 JVM_END
776
777
778 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
779 jint last_batch_count, jint buffer_size, jint start_index,
780 jobjectArray frames))
781 // frames array is a ClassFrameInfo[] array when only getting caller reference,
782 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
783 // be null.
784 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
785 refArrayHandle frames_array_h(THREAD, fa);
786
787 if (frames_array_h->length() < buffer_size) {
788 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
789 }
790
791 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
792 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
793 start_index, frames_array_h, THREAD);
794 JVM_END
795
796 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
797 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
798 refArrayHandle frames_array_h(THREAD, fa);
799 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
800 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
801
802 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
803 JVM_END
804
805 // java.lang.Object ///////////////////////////////////////////////
806
807
808 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
809 // as implemented in the classic virtual machine; return 0 if object is null
810 if (handle == nullptr) {
811 return 0;
812 }
813 oop obj = JNIHandles::resolve_non_null(handle);
814 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) {
815 const intptr_t obj_identity_hash = obj->mark().hash();
816 // Check if mark word contains hash code already.
817 // It is possible that the generated identity hash is 0, which is not
818 // distinct from the no_hash value. In such a case, the hash will be
819 // computed and set every time JVM_IHashCode is called. If that happens,
820 // the only consequence is losing out on the optimization.
821 if (obj_identity_hash != markWord::no_hash) {
822 return checked_cast<jint>(obj_identity_hash);
823 }
824
825 // Compute hash by calling ValueObjectMethods.valueObjectHashCode.
826 // The identity hash is invariantly immutable (see its JavaDoc comment).
827 JavaValue result(T_INT);
828 JavaCallArguments args;
829 Handle ho(THREAD, obj);
830 args.push_oop(ho);
831 methodHandle method(THREAD, Universe::value_object_hash_code_method());
832 JavaCalls::call(&result, method, &args, THREAD);
833 if (HAS_PENDING_EXCEPTION) {
834 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
835 Handle e(THREAD, PENDING_EXCEPTION);
836 CLEAR_PENDING_EXCEPTION;
837 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
838 }
839 }
840 const intptr_t identity_hash = result.get_jint();
841
842 // We now have to set the hash via CAS. It's possible that this will race
843 // other threads. By our invariant of immutability, when there is a
844 // race, the identity hash code is going to be one of the following:
845 // a) 0, another thread updated other markWord bits; b) identity_hash set
846 // by another thread; or c) identity_hash set by the current thread.
847 // A nonzero identity hash code that is not the identity_hash computed
848 // earlier indicates a violation of the invariant.
849 markWord current_mark, old_mark, new_mark;
850 do {
851 current_mark = ho->mark();
852 new_mark = current_mark.copy_set_hash(identity_hash);
853 old_mark = ho->cas_set_mark(new_mark, current_mark);
854 assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(),
855 "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT,
856 new_mark.hash(),
857 old_mark.hash());
858 } while (old_mark != current_mark);
859
860 return checked_cast<jint>(new_mark.hash());
861 } else {
862 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
863 }
864 JVM_END
865
866
867 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
868 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
869 ObjectSynchronizer::wait(obj, ms, CHECK);
870 JVM_END
871
872
873 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
874 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
875 ObjectSynchronizer::notify(obj, CHECK);
876 JVM_END
877
878
879 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
880 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
881 ObjectSynchronizer::notifyall(obj, CHECK);
882 JVM_END
883
884
885 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
886 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
887 Klass* klass = obj->klass();
888 JvmtiVMObjectAllocEventCollector oam;
889
890 #ifdef ASSERT
891 // Just checking that the cloneable flag is set correct
892 if (obj->is_array()) {
893 guarantee(klass->is_cloneable(), "all arrays are cloneable");
894 } else {
895 guarantee(obj->is_instance(), "should be instanceOop");
896 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
897 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
898 }
899 #endif
900
901 // Check if class of obj supports the Cloneable interface.
902 // All arrays are considered to be cloneable (See JLS 20.1.5).
903 // All j.l.r.Reference classes are considered non-cloneable.
904 if (!klass->is_cloneable() ||
905 (klass->is_instance_klass() &&
906 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
907 ResourceMark rm(THREAD);
908 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
909 }
910
911 if (klass->is_inline_klass()) {
912 // Value instances have no identity, so return the current instance instead of allocating a new one
913 // Value classes cannot have finalizers, so the method can return immediately
914 return JNIHandles::make_local(THREAD, obj());
915 }
916
917 // Make shallow object copy
918 const size_t size = obj->size();
919 oop new_obj_oop = nullptr;
920 if (obj->is_array()) {
921 const int length = ((arrayOop)obj())->length();
922 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
923 /* do_zero */ true, CHECK_NULL);
924 } else {
925 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
926 }
927
928 HeapAccess<>::clone(obj(), new_obj_oop, size);
929
930 Handle new_obj(THREAD, new_obj_oop);
931 // Caution: this involves a java upcall, so the clone should be
932 // "gc-robust" by this stage.
933 if (klass->has_finalizer()) {
934 assert(obj->is_instance(), "should be instanceOop");
935 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
936 new_obj = Handle(THREAD, new_obj_oop);
937 }
938
939 return JNIHandles::make_local(THREAD, new_obj());
940 JVM_END
941
942 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
943
944 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
945 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
946 JVM_END
947
948 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
949 return InstanceKlass::is_finalization_enabled();
950 JVM_END
951
952 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
953
954 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
955 CONT_RegisterNativeMethods(env, cls);
956 JVM_END
957
958 // java.io.File ///////////////////////////////////////////////////////////////
959
960 JVM_LEAF(char*, JVM_NativePath(char* path))
961 return os::native_path(path);
962 JVM_END
963
964
965 // Misc. class handling ///////////////////////////////////////////////////////////
966
967
968 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
969 // Getting the class of the caller frame.
970 //
971 // The call stack at this point looks something like this:
972 //
973 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
974 // [1] [ @CallerSensitive API.method ]
975 // [.] [ (skipped intermediate frames) ]
976 // [n] [ caller ]
977 vframeStream vfst(thread);
978 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
979 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
980 Method* m = vfst.method();
981 assert(m != nullptr, "sanity");
982 switch (n) {
983 case 0:
984 // This must only be called from Reflection.getCallerClass
985 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
986 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
987 }
988 // fall-through
989 case 1:
990 // Frame 0 and 1 must be caller sensitive.
991 if (!m->caller_sensitive()) {
992 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
993 }
994 break;
995 default:
996 if (!m->is_ignored_by_security_stack_walk()) {
997 // We have reached the desired frame; return the holder class.
998 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
999 }
1000 break;
1001 }
1002 }
1003 return nullptr;
1004 JVM_END
1005
1006
1007 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
1008 oop mirror = nullptr;
1009 BasicType t = name2type(utf);
1010 if (t != T_ILLEGAL && !is_reference_type(t)) {
1011 mirror = Universe::java_mirror(t);
1012 }
1013 if (mirror == nullptr) {
1014 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
1015 } else {
1016 return (jclass) JNIHandles::make_local(THREAD, mirror);
1017 }
1018 JVM_END
1019
1020
1021 // Returns a class loaded by the bootstrap class loader; or null
1022 // if not found. ClassNotFoundException is not thrown.
1023 // FindClassFromBootLoader is exported to the launcher for windows.
1024 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
1025 const char* name))
1026 // Java libraries should ensure that name is never null or illegal.
1027 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
1028 // It's impossible to create this class; the name cannot fit
1029 // into the constant pool.
1030 return nullptr;
1031 }
1032 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
1033
1034 TempNewSymbol h_name = SymbolTable::new_symbol(name);
1035 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
1036 if (k == nullptr) {
1037 return nullptr;
1038 }
1039
1040 if (log_is_enabled(Debug, class, resolve)) {
1041 trace_class_resolution(k);
1042 }
1043 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1044 JVM_END
1045
1046 // Find a class with this name in this loader.
1047 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
1048 jboolean init, jobject loader))
1049 TempNewSymbol h_name =
1050 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1051 CHECK_NULL);
1052
1053 oop loader_oop = JNIHandles::resolve(loader);
1054 Handle h_loader(THREAD, loader_oop);
1055
1056 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1057 false, THREAD);
1058
1059 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1060 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1061 }
1062 return result;
1063 JVM_END
1064
1065 // Currently only called from the old verifier.
1066 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1067 jboolean init, jclass from))
1068 TempNewSymbol h_name =
1069 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1070 CHECK_NULL);
1071 oop from_class_oop = JNIHandles::resolve(from);
1072 assert(from_class_oop != nullptr, "must be");
1073 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1074 assert(from_class != nullptr, "must be");
1075 oop class_loader = from_class->class_loader();
1076
1077 Handle h_loader(THREAD, class_loader);
1078 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1079
1080 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1081 // this function is generally only used for class loading during verification.
1082 ResourceMark rm;
1083 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1084 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1085 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1086 }
1087
1088 #if INCLUDE_CDS
1089 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1090 InstanceKlass* ik = InstanceKlass::cast(from_class);
1091 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1092 }
1093 #endif
1094
1095 return result;
1096 JVM_END
1097
1098 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1099 static jclass jvm_define_class_common(const char *name,
1100 jobject loader, const jbyte *buf,
1101 jsize len, jobject pd, const char *source,
1102 TRAPS) {
1103 if (source == nullptr) source = "__JVM_DefineClass__";
1104
1105 JavaThread* jt = THREAD;
1106
1107 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1108 ClassLoader::perf_define_appclass_selftime(),
1109 ClassLoader::perf_define_appclasses(),
1110 jt->get_thread_stat()->perf_recursion_counts_addr(),
1111 jt->get_thread_stat()->perf_timers_addr(),
1112 PerfClassTraceTime::DEFINE_CLASS);
1113
1114 if (UsePerfData) {
1115 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1116 }
1117
1118 // Class resolution will get the class name from the .class stream if the name is null.
1119 TempNewSymbol class_name = name == nullptr ? nullptr :
1120 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1121 CHECK_NULL);
1122
1123 ResourceMark rm(THREAD);
1124 ClassFileStream st((u1*)buf, len, source);
1125 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1126 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1127 ClassLoadInfo cl_info(protection_domain);
1128 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1129 class_loader,
1130 cl_info,
1131 CHECK_NULL);
1132
1133 if (log_is_enabled(Debug, class, resolve)) {
1134 trace_class_resolution(k);
1135 }
1136
1137 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1138 }
1139
1140 enum {
1141 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1142 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1143 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1144 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1145 };
1146
1147 /*
1148 * Define a class with the specified flags that indicates if it's a nestmate,
1149 * hidden, or strongly referenced from class loader.
1150 */
1151 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1152 const jbyte *buf, jsize len, jobject pd,
1153 jboolean init, int flags, jobject classData, TRAPS) {
1154 ResourceMark rm(THREAD);
1155
1156 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1157 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1158 if (lookup_k == nullptr) {
1159 // The error message is wrong. We come here only if lookup is a primitive class
1160 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1161 }
1162
1163 Handle class_loader (THREAD, lookup_k->class_loader());
1164
1165 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1166 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1167 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1168 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1169
1170 InstanceKlass* host_class = nullptr;
1171 if (is_nestmate) {
1172 host_class = lookup_k->nest_host(CHECK_NULL);
1173 }
1174
1175 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1176 name,
1177 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1178 is_nestmate ? host_class->external_name() : "",
1179 is_hidden ? "hidden" : "not hidden",
1180 is_strong ? "strong" : "weak",
1181 vm_annotations ? "with vm annotations" : "without vm annotation");
1182
1183 if (!is_hidden) {
1184 // classData is only applicable for hidden classes
1185 if (classData != nullptr) {
1186 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1187 }
1188 if (is_nestmate) {
1189 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1190 }
1191 if (!is_strong) {
1192 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1193 }
1194 if (vm_annotations) {
1195 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1196 }
1197 if (flags != STRONG_LOADER_LINK) {
1198 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1199 err_msg("invalid flag 0x%x", flags));
1200 }
1201 }
1202
1203 // Class resolution will get the class name from the .class stream if the name is null.
1204 TempNewSymbol class_name = name == nullptr ? nullptr :
1205 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1206 CHECK_NULL);
1207
1208 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1209 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1210 ClassFileStream st((u1*)buf, len, source);
1211
1212 InstanceKlass* ik = nullptr;
1213 if (!is_hidden) {
1214 ClassLoadInfo cl_info(protection_domain);
1215 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1216 class_loader,
1217 cl_info,
1218 CHECK_NULL);
1219
1220 if (log_is_enabled(Debug, class, resolve)) {
1221 trace_class_resolution(ik);
1222 }
1223 } else { // hidden
1224 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1225 ClassLoadInfo cl_info(protection_domain,
1226 host_class,
1227 classData_h,
1228 is_hidden,
1229 is_strong,
1230 vm_annotations);
1231 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1232 class_loader,
1233 cl_info,
1234 CHECK_NULL);
1235
1236 // The hidden class loader data has been artificially been kept alive to
1237 // this point. The mirror and any instances of this class have to keep
1238 // it alive afterwards.
1239 ik->class_loader_data()->dec_keep_alive_ref_count();
1240
1241 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1242 ModuleEntry* module = ik->module();
1243 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1244 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1245 module_name,
1246 ik->external_name(),
1247 host_class->external_name(),
1248 ik->is_hidden() ? "is hidden" : "is not hidden");
1249 }
1250 }
1251
1252 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1253 // non-hidden class or nestmate class must be in the same package as the Lookup class
1254 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1255 }
1256
1257 if (init) {
1258 ik->initialize(CHECK_NULL);
1259 } else {
1260 ik->link_class(CHECK_NULL);
1261 }
1262
1263 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1264 }
1265
1266 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1267 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1268 JVM_END
1269
1270 /*
1271 * Define a class with the specified lookup class.
1272 * lookup: Lookup class
1273 * name: the name of the class
1274 * buf: class bytes
1275 * len: length of class bytes
1276 * pd: protection domain
1277 * init: initialize the class
1278 * flags: properties of the class
1279 * classData: private static pre-initialized field
1280 */
1281 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1282 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1283
1284 if (lookup == nullptr) {
1285 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1286 }
1287
1288 assert(buf != nullptr, "buf must not be null");
1289
1290 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1291 JVM_END
1292
1293 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1294
1295 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1296 JVM_END
1297
1298 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1299 ResourceMark rm(THREAD);
1300
1301 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1302 char* str = java_lang_String::as_utf8_string(h_name());
1303
1304 // Sanity check, don't expect null
1305 if (str == nullptr) return nullptr;
1306
1307 // Internalize the string, converting '.' to '/' in string.
1308 char* p = (char*)str;
1309 while (*p != '\0') {
1310 if (*p == '.') {
1311 *p = '/';
1312 }
1313 p++;
1314 }
1315
1316 const int str_len = (int)(p - str);
1317 if (str_len > Symbol::max_length()) {
1318 // It's impossible to create this class; the name cannot fit
1319 // into the constant pool.
1320 return nullptr;
1321 }
1322 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1323
1324 // Security Note:
1325 // The Java level wrapper will perform the necessary security check allowing
1326 // us to pass the null as the initiating class loader.
1327 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1328 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1329 #if INCLUDE_CDS
1330 if (k == nullptr) {
1331 // If the class is not already loaded, try to see if it's in the shared
1332 // archive for the current classloader (h_loader).
1333 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1334 }
1335 #endif
1336 return (k == nullptr) ? nullptr :
1337 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1338 JVM_END
1339
1340 // Module support //////////////////////////////////////////////////////////////////////////////
1341
1342 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1343 jstring location, jobjectArray packages))
1344 Handle h_module (THREAD, JNIHandles::resolve(module));
1345 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1346 JVM_END
1347
1348 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1349 Handle h_module (THREAD, JNIHandles::resolve(module));
1350 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1351 JVM_END
1352
1353 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1354 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1355 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1356 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1357 JVM_END
1358
1359 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1360 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1361 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1362 JVM_END
1363
1364 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1365 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1366 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1367 JVM_END
1368
1369 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1370 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1371 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1372 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1373 JVM_END
1374
1375 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1376 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1377 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1378 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1379 JVM_END
1380
1381 // Reflection support //////////////////////////////////////////////////////////////////////////////
1382
1383 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1384 assert (cls != nullptr, "illegal class");
1385 JvmtiVMObjectAllocEventCollector oam;
1386 ResourceMark rm(THREAD);
1387 HandleMark hm(THREAD);
1388 Handle java_class(THREAD, JNIHandles::resolve(cls));
1389 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1390 return (jstring) JNIHandles::make_local(THREAD, result);
1391 JVM_END
1392
1393
1394 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1395 JvmtiVMObjectAllocEventCollector oam;
1396 oop mirror = JNIHandles::resolve_non_null(cls);
1397
1398 // Special handling for primitive objects
1399 if (java_lang_Class::is_primitive(mirror)) {
1400 // Primitive objects does not have any interfaces
1401 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1402 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1403 }
1404
1405 Klass* klass = java_lang_Class::as_Klass(mirror);
1406 // Figure size of result array
1407 int size;
1408 if (klass->is_instance_klass()) {
1409 InstanceKlass* ik = InstanceKlass::cast(klass);
1410 size = ik->local_interfaces()->length();
1411 } else {
1412 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1413 size = 2;
1414 }
1415
1416 // Allocate result array
1417 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1418 objArrayHandle result (THREAD, r);
1419 // Fill in result
1420 if (klass->is_instance_klass()) {
1421 // Regular instance klass, fill in all local interfaces
1422 for (int index = 0; index < size; index++) {
1423 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1424 result->obj_at_put(index, k->java_mirror());
1425 }
1426 } else {
1427 // All arrays implement java.lang.Cloneable and java.io.Serializable
1428 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1429 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1430 }
1431 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1432 JVM_END
1433
1434
1435 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1436 oop mirror = JNIHandles::resolve_non_null(cls);
1437 if (java_lang_Class::is_primitive(mirror)) {
1438 return JNI_FALSE;
1439 }
1440 Klass* k = java_lang_Class::as_Klass(mirror);
1441 return k->is_hidden();
1442 JVM_END
1443
1444
1445 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1446 ResourceMark rm(THREAD);
1447 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1448 JvmtiVMObjectAllocEventCollector oam;
1449
1450 // Iterate through Java frames
1451 vframeStream vfst(thread);
1452 for(; !vfst.at_end(); vfst.next()) {
1453 int loc = -1;
1454 // get method of frame
1455 Method* method = vfst.method();
1456
1457 Symbol *name = method->name();
1458
1459 InstanceKlass* holder = method->method_holder();
1460 if (name == vmSymbols::runWith_method_name()) {
1461 if (holder == vmClasses::Thread_klass()
1462 || holder == vmClasses::ScopedValue_Carrier_klass()) {
1463 loc = 1;
1464 }
1465 }
1466
1467 if (loc != -1) {
1468 javaVFrame *frame = vfst.asJavaVFrame();
1469 StackValueCollection* locals = frame->locals();
1470 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1471 Handle result = head_sv->get_obj();
1472 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1473 if (result() != nullptr) {
1474 return JNIHandles::make_local(THREAD, result());
1475 }
1476 }
1477 }
1478
1479 return nullptr;
1480 JVM_END
1481
1482 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1483 JvmtiVMObjectAllocEventCollector oam;
1484 // ofClass is a reference to a java_lang_Class object. The mirror object
1485 // of an InstanceKlass
1486 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1487 if (java_lang_Class::is_primitive(ofMirror) ||
1488 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1489 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1490 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1491 }
1492
1493 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1494 InnerClassesIterator iter(k);
1495
1496 if (iter.length() == 0) {
1497 // Neither an inner nor outer class
1498 oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1499 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1500 }
1501
1502 // find inner class info
1503 constantPoolHandle cp(thread, k->constants());
1504 int length = iter.length();
1505
1506 // Allocate temp. result array
1507 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL);
1508 refArrayHandle result(THREAD, r);
1509 int members = 0;
1510
1511 for (; !iter.done(); iter.next()) {
1512 int ioff = iter.inner_class_info_index();
1513 int ooff = iter.outer_class_info_index();
1514
1515 if (ioff != 0 && ooff != 0) {
1516 // Check to see if the name matches the class we're looking for
1517 // before attempting to find the class.
1518 if (cp->klass_name_at_matches(k, ooff)) {
1519 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1520 if (outer_klass == k) {
1521 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1522 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1523
1524 // Throws an exception if outer klass has not declared k as
1525 // an inner klass
1526 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1527
1528 result->obj_at_put(members, inner_klass->java_mirror());
1529 members++;
1530 }
1531 }
1532 }
1533 }
1534
1535 if (members != length) {
1536 // Return array of right length
1537 refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL);
1538 for(int i = 0; i < members; i++) {
1539 res->obj_at_put(i, result->obj_at(i));
1540 }
1541 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1542 }
1543
1544 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1545 JVM_END
1546
1547
1548 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1549 {
1550 // ofClass is a reference to a java_lang_Class object.
1551 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1552 if (java_lang_Class::is_primitive(ofMirror)) {
1553 return nullptr;
1554 }
1555 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1556 if (!klass->is_instance_klass()) {
1557 return nullptr;
1558 }
1559
1560 bool inner_is_member = false;
1561 Klass* outer_klass
1562 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1563 if (outer_klass == nullptr) return nullptr; // already a top-level class
1564 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1565 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1566 }
1567 JVM_END
1568
1569 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1570 {
1571 oop mirror = JNIHandles::resolve_non_null(cls);
1572 if (java_lang_Class::is_primitive(mirror)) {
1573 return nullptr;
1574 }
1575 Klass* klass = java_lang_Class::as_Klass(mirror);
1576 if (!klass->is_instance_klass()) {
1577 return nullptr;
1578 }
1579 InstanceKlass* k = InstanceKlass::cast(klass);
1580 int ooff = 0, noff = 0;
1581 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1582 if (noff != 0) {
1583 constantPoolHandle i_cp(thread, k->constants());
1584 Symbol* name = i_cp->symbol_at(noff);
1585 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1586 return (jstring) JNIHandles::make_local(THREAD, str());
1587 }
1588 }
1589 return nullptr;
1590 }
1591 JVM_END
1592
1593 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1594 assert (cls != nullptr, "illegal class");
1595 JvmtiVMObjectAllocEventCollector oam;
1596 ResourceMark rm(THREAD);
1597 oop mirror = JNIHandles::resolve_non_null(cls);
1598 // Return null for arrays and primitives
1599 if (!java_lang_Class::is_primitive(mirror)) {
1600 Klass* k = java_lang_Class::as_Klass(mirror);
1601 if (k->is_instance_klass()) {
1602 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1603 if (sym == nullptr) return nullptr;
1604 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1605 return (jstring) JNIHandles::make_local(THREAD, str());
1606 }
1607 }
1608 return nullptr;
1609 JVM_END
1610
1611
1612 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1613 assert (cls != nullptr, "illegal class");
1614 oop mirror = JNIHandles::resolve_non_null(cls);
1615 // Return null for arrays and primitives
1616 if (!java_lang_Class::is_primitive(mirror)) {
1617 Klass* k = java_lang_Class::as_Klass(mirror);
1618 if (k->is_instance_klass()) {
1619 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1620 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1621 }
1622 }
1623 return nullptr;
1624 JVM_END
1625
1626
1627 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1628 // some of this code was adapted from from jni_FromReflectedField
1629
1630 oop reflected = JNIHandles::resolve_non_null(field);
1631 oop mirror = java_lang_reflect_Field::clazz(reflected);
1632 int slot = java_lang_reflect_Field::slot(reflected);
1633 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1634
1635 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1636 int offset = ik->field_offset(slot);
1637
1638 if (modifiers & JVM_ACC_STATIC) {
1639 // for static fields we only look in the current class
1640 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1641 assert(false, "cannot find static field");
1642 return false;
1643 }
1644 } else {
1645 // for instance fields we start with the current class and work
1646 // our way up through the superclass chain
1647 if (!ik->find_field_from_offset(offset, false, &fd)) {
1648 assert(false, "cannot find instance field");
1649 return false;
1650 }
1651 }
1652 return true;
1653 }
1654
1655 static Method* jvm_get_method_common(jobject method) {
1656 // some of this code was adapted from from jni_FromReflectedMethod
1657
1658 oop reflected = JNIHandles::resolve_non_null(method);
1659 oop mirror = nullptr;
1660 int slot = 0;
1661
1662 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1663 mirror = java_lang_reflect_Constructor::clazz(reflected);
1664 slot = java_lang_reflect_Constructor::slot(reflected);
1665 } else {
1666 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1667 "wrong type");
1668 mirror = java_lang_reflect_Method::clazz(reflected);
1669 slot = java_lang_reflect_Method::slot(reflected);
1670 }
1671 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1672
1673 Method* m = ik->method_with_idnum(slot);
1674 assert(m != nullptr, "cannot find method");
1675 return m; // caller has to deal with null in product mode
1676 }
1677
1678 /* Type use annotations support (JDK 1.8) */
1679
1680 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1681 assert (cls != nullptr, "illegal class");
1682 ResourceMark rm(THREAD);
1683 // Return null for arrays and primitives
1684 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1685 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1686 if (k->is_instance_klass()) {
1687 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1688 if (type_annotations != nullptr) {
1689 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1690 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1691 }
1692 }
1693 }
1694 return nullptr;
1695 JVM_END
1696
1697 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1698 assert (method != nullptr, "illegal method");
1699 // method is a handle to a java.lang.reflect.Method object
1700 Method* m = jvm_get_method_common(method);
1701 if (m == nullptr) {
1702 return nullptr;
1703 }
1704
1705 AnnotationArray* type_annotations = m->type_annotations();
1706 if (type_annotations != nullptr) {
1707 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1708 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1709 }
1710
1711 return nullptr;
1712 JVM_END
1713
1714 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1715 assert (field != nullptr, "illegal field");
1716 fieldDescriptor fd;
1717 bool gotFd = jvm_get_field_common(field, fd);
1718 if (!gotFd) {
1719 return nullptr;
1720 }
1721
1722 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1723 JVM_END
1724
1725 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1726 if (!cp->is_within_bounds(index)) {
1727 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1728 }
1729 }
1730
1731 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1732 {
1733 // method is a handle to a java.lang.reflect.Method object
1734 Method* method_ptr = jvm_get_method_common(method);
1735 methodHandle mh (THREAD, method_ptr);
1736 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1737 const int num_params = mh->method_parameters_length();
1738
1739 if (num_params < 0) {
1740 // A -1 return value from method_parameters_length means there is no
1741 // parameter data. Return null to indicate this to the reflection
1742 // API.
1743 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1744 return (jobjectArray)nullptr;
1745 } else {
1746 // Otherwise, we return something up to reflection, even if it is
1747 // a zero-length array. Why? Because in some cases this can
1748 // trigger a MalformedParametersException.
1749
1750 // make sure all the symbols are properly formatted
1751 for (int i = 0; i < num_params; i++) {
1752 MethodParametersElement* params = mh->method_parameters_start();
1753 int index = params[i].name_cp_index;
1754 constantPoolHandle cp(THREAD, mh->constants());
1755 bounds_check(cp, index, CHECK_NULL);
1756
1757 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1758 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1759 "Wrong type at constant pool index");
1760 }
1761
1762 }
1763
1764 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1765 objArrayHandle result (THREAD, result_oop);
1766
1767 for (int i = 0; i < num_params; i++) {
1768 MethodParametersElement* params = mh->method_parameters_start();
1769 // For a 0 index, give a null symbol
1770 Symbol* sym = 0 != params[i].name_cp_index ?
1771 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1772 int flags = params[i].flags;
1773 oop param = Reflection::new_parameter(reflected_method, i, sym,
1774 flags, CHECK_NULL);
1775 result->obj_at_put(i, param);
1776 }
1777 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1778 }
1779 }
1780 JVM_END
1781
1782 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1783
1784 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1785 {
1786 JvmtiVMObjectAllocEventCollector oam;
1787
1788 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1789 // Exclude primitive types and array types
1790 if (java_lang_Class::is_primitive(ofMirror) ||
1791 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1792 // Return empty array
1793 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1794 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1795 }
1796
1797 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1798 constantPoolHandle cp(THREAD, k->constants());
1799
1800 // Ensure class is linked
1801 k->link_class(CHECK_NULL);
1802
1803 // Allocate result
1804 int num_fields;
1805
1806 if (publicOnly) {
1807 num_fields = 0;
1808 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1809 if (fs.access_flags().is_public()) ++num_fields;
1810 }
1811 } else {
1812 num_fields = k->java_fields_count();
1813 }
1814
1815 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1816 objArrayHandle result (THREAD, r);
1817
1818 int out_idx = 0;
1819 fieldDescriptor fd;
1820 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1821 if (!publicOnly || fs.access_flags().is_public()) {
1822 fd.reinitialize(k, fs.to_FieldInfo());
1823 oop field = Reflection::new_field(&fd, CHECK_NULL);
1824 result->obj_at_put(out_idx, field);
1825 ++out_idx;
1826 }
1827 }
1828 assert(out_idx == num_fields, "just checking");
1829 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1830 }
1831 JVM_END
1832
1833 // A class is a record if and only if it is final and a direct subclass of
1834 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1835 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1836 {
1837 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1838 if (k != nullptr && k->is_instance_klass()) {
1839 InstanceKlass* ik = InstanceKlass::cast(k);
1840 return ik->is_record();
1841 } else {
1842 return false;
1843 }
1844 }
1845 JVM_END
1846
1847 // Returns an array containing the components of the Record attribute,
1848 // or null if the attribute is not present.
1849 //
1850 // Note that this function returns the components of the Record attribute
1851 // even if the class is not a record.
1852 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1853 {
1854 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1855
1856 Array<RecordComponent*>* components = ik->record_components();
1857 if (components != nullptr) {
1858 JvmtiVMObjectAllocEventCollector oam;
1859 constantPoolHandle cp(THREAD, ik->constants());
1860 int length = components->length();
1861 assert(length >= 0, "unexpected record_components length");
1862 objArrayOop record_components =
1863 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1864 objArrayHandle components_h (THREAD, record_components);
1865
1866 for (int x = 0; x < length; x++) {
1867 RecordComponent* component = components->at(x);
1868 assert(component != nullptr, "unexpected null record component");
1869 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1870 components_h->obj_at_put(x, component_oop);
1871 }
1872 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1873 }
1874
1875 return nullptr;
1876 }
1877 JVM_END
1878
1879 static jobjectArray get_class_declared_methods_helper(
1880 JNIEnv *env,
1881 jclass ofClass, jboolean publicOnly,
1882 bool want_constructor,
1883 Klass* klass, TRAPS) {
1884
1885 JvmtiVMObjectAllocEventCollector oam;
1886
1887 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1888 // Exclude primitive types and array types
1889 if (java_lang_Class::is_primitive(ofMirror)
1890 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1891 // Return empty array
1892 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1893 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1894 }
1895
1896 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1897
1898 // Ensure class is linked
1899 k->link_class(CHECK_NULL);
1900
1901 Array<Method*>* methods = k->methods();
1902 int methods_length = methods->length();
1903
1904 // Save original method_idnum in case of redefinition, which can change
1905 // the idnum of obsolete methods. The new method will have the same idnum
1906 // but if we refresh the methods array, the counts will be wrong.
1907 ResourceMark rm(THREAD);
1908 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1909 int num_methods = 0;
1910
1911 // Select methods matching the criteria.
1912 for (int i = 0; i < methods_length; i++) {
1913 Method* method = methods->at(i);
1914 if (want_constructor && !method->is_object_constructor()) {
1915 continue;
1916 }
1917 if (!want_constructor &&
1918 (method->is_object_constructor() || method->is_class_initializer() ||
1919 method->is_overpass())) {
1920 continue;
1921 }
1922 if (publicOnly && !method->is_public()) {
1923 continue;
1924 }
1925 idnums->push(method->method_idnum());
1926 ++num_methods;
1927 }
1928
1929 // Allocate result
1930 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1931 objArrayHandle result (THREAD, r);
1932
1933 // Now just put the methods that we selected above, but go by their idnum
1934 // in case of redefinition. The methods can be redefined at any safepoint,
1935 // so above when allocating the oop array and below when creating reflect
1936 // objects.
1937 for (int i = 0; i < num_methods; i++) {
1938 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1939 if (method.is_null()) {
1940 // Method may have been deleted and seems this API can handle null
1941 // Otherwise should probably put a method that throws NSME
1942 result->obj_at_put(i, nullptr);
1943 } else {
1944 oop m;
1945 if (want_constructor) {
1946 assert(method->is_object_constructor(), "must be");
1947 m = Reflection::new_constructor(method, CHECK_NULL);
1948 } else {
1949 m = Reflection::new_method(method, false, CHECK_NULL);
1950 }
1951 result->obj_at_put(i, m);
1952 }
1953 }
1954
1955 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1956 }
1957
1958 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1959 {
1960 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1961 /*want_constructor*/ false,
1962 vmClasses::reflect_Method_klass(), THREAD);
1963 }
1964 JVM_END
1965
1966 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1967 {
1968 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1969 /*want_constructor*/ true,
1970 vmClasses::reflect_Constructor_klass(), THREAD);
1971 }
1972 JVM_END
1973
1974 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1975 {
1976 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1977 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1978 return c->has_nestmate_access_to(m, THREAD);
1979 }
1980 JVM_END
1981
1982 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1983 {
1984 // current is not a primitive or array class
1985 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1986 InstanceKlass* host = c->nest_host(THREAD);
1987 return (jclass) (host == nullptr ? nullptr :
1988 JNIHandles::make_local(THREAD, host->java_mirror()));
1989 }
1990 JVM_END
1991
1992 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1993 {
1994 // current is not a primitive or array class
1995 ResourceMark rm(THREAD);
1996 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1997 InstanceKlass* host = c->nest_host(THREAD);
1998
1999 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2000 c->external_name(), host->external_name());
2001 {
2002 JvmtiVMObjectAllocEventCollector oam;
2003 Array<u2>* members = host->nest_members();
2004 int length = members == nullptr ? 0 : members->length();
2005
2006 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2007
2008 // nest host is first in the array so make it one bigger
2009 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL);
2010 refArrayHandle result(THREAD, r);
2011 result->obj_at_put(0, host->java_mirror());
2012 if (length != 0) {
2013 int count = 0;
2014 for (int i = 0; i < length; i++) {
2015 int cp_index = members->at(i);
2016 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2017 if (HAS_PENDING_EXCEPTION) {
2018 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2019 return nullptr; // propagate VMEs
2020 }
2021 if (log_is_enabled(Trace, class, nestmates)) {
2022 stringStream ss;
2023 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2024 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2025 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2026 log_trace(class, nestmates)("%s", ss.as_string());
2027 }
2028 CLEAR_PENDING_EXCEPTION;
2029 continue;
2030 }
2031 if (k->is_instance_klass()) {
2032 InstanceKlass* ik = InstanceKlass::cast(k);
2033 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2034 if (nest_host_k == host) {
2035 result->obj_at_put(count+1, k->java_mirror());
2036 count++;
2037 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2038 } else {
2039 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2040 ik->external_name(), nest_host_k->external_name());
2041 }
2042 } else {
2043 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2044 k->external_name());
2045 }
2046 }
2047 if (count < length) {
2048 // we had invalid entries so we need to compact the array
2049 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2050 length + 1, count + 1);
2051
2052 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2053 count + 1, CHECK_NULL);
2054 objArrayHandle result2(THREAD, r2);
2055 for (int i = 0; i < count + 1; i++) {
2056 result2->obj_at_put(i, result->obj_at(i));
2057 }
2058 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2059 }
2060 }
2061 else {
2062 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2063 }
2064 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2065 }
2066 }
2067 JVM_END
2068
2069 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2070 {
2071 oop mirror = JNIHandles::resolve_non_null(current);
2072 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2073 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2074
2075 ResourceMark rm(THREAD);
2076 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2077 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2078 if (ik->is_sealed()) {
2079 JvmtiVMObjectAllocEventCollector oam;
2080 Array<u2>* subclasses = ik->permitted_subclasses();
2081 int length = subclasses->length();
2082
2083 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2084
2085 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL);
2086 refArrayHandle result(THREAD, r);
2087 int count = 0;
2088 for (int i = 0; i < length; i++) {
2089 int cp_index = subclasses->at(i);
2090 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2091 if (HAS_PENDING_EXCEPTION) {
2092 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2093 return nullptr; // propagate VMEs
2094 }
2095 if (log_is_enabled(Trace, class, sealed)) {
2096 stringStream ss;
2097 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2098 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2099 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2100 log_trace(class, sealed)("%s", ss.as_string());
2101 }
2102
2103 CLEAR_PENDING_EXCEPTION;
2104 continue;
2105 }
2106 if (k->is_instance_klass()) {
2107 result->obj_at_put(count++, k->java_mirror());
2108 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2109 }
2110 }
2111 if (count < length) {
2112 // we had invalid entries so we need to compact the array
2113 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2114 count, CHECK_NULL);
2115 objArrayHandle result2(THREAD, r2);
2116 for (int i = 0; i < count; i++) {
2117 result2->obj_at_put(i, result->obj_at(i));
2118 }
2119 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2120 }
2121 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2122 } else {
2123 return nullptr;
2124 }
2125 }
2126 JVM_END
2127
2128 // Constant pool access //////////////////////////////////////////////////////////
2129
2130 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2131 {
2132 JvmtiVMObjectAllocEventCollector oam;
2133 oop mirror = JNIHandles::resolve_non_null(cls);
2134 // Return null for primitives and arrays
2135 if (!java_lang_Class::is_primitive(mirror)) {
2136 Klass* k = java_lang_Class::as_Klass(mirror);
2137 if (k->is_instance_klass()) {
2138 InstanceKlass* k_h = InstanceKlass::cast(k);
2139 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2140 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2141 return JNIHandles::make_local(THREAD, jcp());
2142 }
2143 }
2144 return nullptr;
2145 }
2146 JVM_END
2147
2148
2149 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2150 {
2151 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2152 return cp->length();
2153 }
2154 JVM_END
2155
2156
2157 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2158 {
2159 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2160 bounds_check(cp, index, CHECK_NULL);
2161 constantTag tag = cp->tag_at(index);
2162 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2163 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2164 }
2165 Klass* k = cp->klass_at(index, CHECK_NULL);
2166 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2167 }
2168 JVM_END
2169
2170 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2171 {
2172 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2173 bounds_check(cp, index, CHECK_NULL);
2174 constantTag tag = cp->tag_at(index);
2175 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2176 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2177 }
2178 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2179 if (k == nullptr) return nullptr;
2180 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2181 }
2182 JVM_END
2183
2184 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2185 constantTag tag = cp->tag_at(index);
2186 if (!tag.is_method() && !tag.is_interface_method()) {
2187 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2188 }
2189 int klass_ref = cp->uncached_klass_ref_index_at(index);
2190 Klass* k_o;
2191 if (force_resolution) {
2192 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2193 } else {
2194 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2195 if (k_o == nullptr) return nullptr;
2196 }
2197 InstanceKlass* k = InstanceKlass::cast(k_o);
2198 Symbol* name = cp->uncached_name_ref_at(index);
2199 Symbol* sig = cp->uncached_signature_ref_at(index);
2200 methodHandle m (THREAD, k->find_method(name, sig));
2201 if (m.is_null()) {
2202 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2203 }
2204 oop method;
2205 if (m->is_object_constructor()) {
2206 method = Reflection::new_constructor(m, CHECK_NULL);
2207 } else {
2208 method = Reflection::new_method(m, true, CHECK_NULL);
2209 }
2210 return JNIHandles::make_local(THREAD, method);
2211 }
2212
2213 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2214 {
2215 JvmtiVMObjectAllocEventCollector oam;
2216 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2217 bounds_check(cp, index, CHECK_NULL);
2218 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2219 return res;
2220 }
2221 JVM_END
2222
2223 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2224 {
2225 JvmtiVMObjectAllocEventCollector oam;
2226 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2227 bounds_check(cp, index, CHECK_NULL);
2228 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2229 return res;
2230 }
2231 JVM_END
2232
2233 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2234 constantTag tag = cp->tag_at(index);
2235 if (!tag.is_field()) {
2236 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2237 }
2238 int klass_ref = cp->uncached_klass_ref_index_at(index);
2239 Klass* k_o;
2240 if (force_resolution) {
2241 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2242 } else {
2243 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2244 if (k_o == nullptr) return nullptr;
2245 }
2246 InstanceKlass* k = InstanceKlass::cast(k_o);
2247 Symbol* name = cp->uncached_name_ref_at(index);
2248 Symbol* sig = cp->uncached_signature_ref_at(index);
2249 fieldDescriptor fd;
2250 Klass* target_klass = k->find_field(name, sig, &fd);
2251 if (target_klass == nullptr) {
2252 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2253 }
2254 oop field = Reflection::new_field(&fd, CHECK_NULL);
2255 return JNIHandles::make_local(THREAD, field);
2256 }
2257
2258 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2259 {
2260 JvmtiVMObjectAllocEventCollector oam;
2261 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2262 bounds_check(cp, index, CHECK_NULL);
2263 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2264 return res;
2265 }
2266 JVM_END
2267
2268 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2269 {
2270 JvmtiVMObjectAllocEventCollector oam;
2271 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2272 bounds_check(cp, index, CHECK_NULL);
2273 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2274 return res;
2275 }
2276 JVM_END
2277
2278 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2279 {
2280 JvmtiVMObjectAllocEventCollector oam;
2281 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2282 bounds_check(cp, index, CHECK_NULL);
2283 constantTag tag = cp->tag_at(index);
2284 if (!tag.is_field_or_method()) {
2285 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2286 }
2287 int klass_ref = cp->uncached_klass_ref_index_at(index);
2288 Symbol* klass_name = cp->klass_name_at(klass_ref);
2289 Symbol* member_name = cp->uncached_name_ref_at(index);
2290 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2291 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2292 objArrayHandle dest(THREAD, dest_o);
2293 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2294 dest->obj_at_put(0, str());
2295 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2296 dest->obj_at_put(1, str());
2297 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2298 dest->obj_at_put(2, str());
2299 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2300 }
2301 JVM_END
2302
2303 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2304 {
2305 JvmtiVMObjectAllocEventCollector oam;
2306 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2307 bounds_check(cp, index, CHECK_0);
2308 constantTag tag = cp->tag_at(index);
2309 if (!tag.is_field_or_method()) {
2310 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2311 }
2312 return (jint) cp->uncached_klass_ref_index_at(index);
2313 }
2314 JVM_END
2315
2316 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2317 {
2318 JvmtiVMObjectAllocEventCollector oam;
2319 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2320 bounds_check(cp, index, CHECK_0);
2321 constantTag tag = cp->tag_at(index);
2322 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2323 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2324 }
2325 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2326 }
2327 JVM_END
2328
2329 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2330 {
2331 JvmtiVMObjectAllocEventCollector oam;
2332 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2333 bounds_check(cp, index, CHECK_NULL);
2334 constantTag tag = cp->tag_at(index);
2335 if (!tag.is_name_and_type()) {
2336 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2337 }
2338 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2339 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2340 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2341 objArrayHandle dest(THREAD, dest_o);
2342 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2343 dest->obj_at_put(0, str());
2344 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2345 dest->obj_at_put(1, str());
2346 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2347 }
2348 JVM_END
2349
2350 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2351 {
2352 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2353 bounds_check(cp, index, CHECK_0);
2354 constantTag tag = cp->tag_at(index);
2355 if (!tag.is_int()) {
2356 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2357 }
2358 return cp->int_at(index);
2359 }
2360 JVM_END
2361
2362 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2363 {
2364 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2365 bounds_check(cp, index, CHECK_(0L));
2366 constantTag tag = cp->tag_at(index);
2367 if (!tag.is_long()) {
2368 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2369 }
2370 return cp->long_at(index);
2371 }
2372 JVM_END
2373
2374 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2375 {
2376 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2377 bounds_check(cp, index, CHECK_(0.0f));
2378 constantTag tag = cp->tag_at(index);
2379 if (!tag.is_float()) {
2380 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2381 }
2382 return cp->float_at(index);
2383 }
2384 JVM_END
2385
2386 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2387 {
2388 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2389 bounds_check(cp, index, CHECK_(0.0));
2390 constantTag tag = cp->tag_at(index);
2391 if (!tag.is_double()) {
2392 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2393 }
2394 return cp->double_at(index);
2395 }
2396 JVM_END
2397
2398 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2399 {
2400 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2401 bounds_check(cp, index, CHECK_NULL);
2402 constantTag tag = cp->tag_at(index);
2403 if (!tag.is_string()) {
2404 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2405 }
2406 oop str = cp->string_at(index, CHECK_NULL);
2407 return (jstring) JNIHandles::make_local(THREAD, str);
2408 }
2409 JVM_END
2410
2411 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2412 {
2413 JvmtiVMObjectAllocEventCollector oam;
2414 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2415 bounds_check(cp, index, CHECK_NULL);
2416 constantTag tag = cp->tag_at(index);
2417 if (!tag.is_symbol()) {
2418 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2419 }
2420 Symbol* sym = cp->symbol_at(index);
2421 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2422 return (jstring) JNIHandles::make_local(THREAD, str());
2423 }
2424 JVM_END
2425
2426 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2427 {
2428 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2429 bounds_check(cp, index, CHECK_0);
2430 constantTag tag = cp->tag_at(index);
2431 jbyte result = tag.value();
2432 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2433 // they are changed to the corresponding tags from the JVM spec, so that java code in
2434 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2435 if (tag.is_klass_or_reference()) {
2436 result = JVM_CONSTANT_Class;
2437 } else if (tag.is_string_index()) {
2438 result = JVM_CONSTANT_String;
2439 } else if (tag.is_method_type_in_error()) {
2440 result = JVM_CONSTANT_MethodType;
2441 } else if (tag.is_method_handle_in_error()) {
2442 result = JVM_CONSTANT_MethodHandle;
2443 } else if (tag.is_dynamic_constant_in_error()) {
2444 result = JVM_CONSTANT_Dynamic;
2445 }
2446 return result;
2447 }
2448 JVM_END
2449
2450 // Assertion support. //////////////////////////////////////////////////////////
2451
2452 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2453 assert(cls != nullptr, "bad class");
2454
2455 oop r = JNIHandles::resolve(cls);
2456 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2457 if (java_lang_Class::is_primitive(r)) return false;
2458
2459 Klass* k = java_lang_Class::as_Klass(r);
2460 assert(k->is_instance_klass(), "must be an instance klass");
2461 if (!k->is_instance_klass()) return false;
2462
2463 ResourceMark rm(THREAD);
2464 const char* name = k->name()->as_C_string();
2465 bool system_class = k->class_loader() == nullptr;
2466 return JavaAssertions::enabled(name, system_class);
2467
2468 JVM_END
2469
2470
2471 // Return a new AssertionStatusDirectives object with the fields filled in with
2472 // command-line assertion arguments (i.e., -ea, -da).
2473 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2474 JvmtiVMObjectAllocEventCollector oam;
2475 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2476 return JNIHandles::make_local(THREAD, asd);
2477 JVM_END
2478
2479 // Verification ////////////////////////////////////////////////////////////////////////////////
2480
2481 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2482
2483 // RedefineClasses support: bug 6214132 caused verification to fail.
2484 // All functions from this section, unless noted otherwise, should call the functions
2485 // get_klass_considering_redefinition(), or
2486 // get_instance_klass_considering_redefinition()
2487 // These functions return JvmtiThreadState::_scratch_class if the verifier
2488 // was invoked in the middle of the redefinition of cls.
2489 // See jvmtiThreadState.hpp for details.
2490
2491 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2493 if (k->is_instance_klass()) {
2494 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2495 } else {
2496 return k;
2497 }
2498 }
2499
2500 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2501 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2502 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2503 }
2504
2505 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2506 oop mirror = JNIHandles::resolve_non_null(cls);
2507 if (java_lang_Class::is_primitive(mirror)) {
2508 return JNI_FALSE;
2509 }
2510 Klass* k = java_lang_Class::as_Klass(mirror);
2511 // This isn't necessary since answer is the same because redefinition
2512 // has already checked this matches for the scratch class.
2513 // k = get_klass_considering_redefinition(cls, thread)
2514 jboolean result = k->is_interface();
2515 assert(!result || k->is_instance_klass(),
2516 "all interfaces are instance types");
2517 return result;
2518 JVM_END
2519
2520 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2521 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2523 return k->name()->as_utf8();
2524 JVM_END
2525
2526
2527 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2528 Klass* k = get_klass_considering_redefinition(cls, thread);
2529 // types will have length zero if this is not an InstanceKlass
2530 // (length is determined by call to JVM_GetClassCPEntriesCount)
2531 if (k->is_instance_klass()) {
2532 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2533 for (int index = cp->length() - 1; index >= 0; index--) {
2534 constantTag tag = cp->tag_at(index);
2535 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2536 }
2537 }
2538 JVM_END
2539
2540
2541 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2542 Klass* k = get_klass_considering_redefinition(cls, thread);
2543 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2544 JVM_END
2545
2546
2547 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2548 Klass* k = get_klass_considering_redefinition(cls, thread);
2549 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2550 JVM_END
2551
2552
2553 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2554 Klass* k = get_klass_considering_redefinition(cls, thread);
2555 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2556 JVM_END
2557
2558
2559 // The following methods, used for the verifier, are never called with
2560 // array klasses, so a direct cast to InstanceKlass is safe.
2561 // Typically, these methods are called in a loop with bounds determined
2562 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2563 // zero for arrays.
2564 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2565 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2566 Method* method = ik->methods()->at(method_index);
2567 int length = method->checked_exceptions_length();
2568 if (length > 0) {
2569 CheckedExceptionElement* table= method->checked_exceptions_start();
2570 for (int i = 0; i < length; i++) {
2571 exceptions[i] = table[i].class_cp_index;
2572 }
2573 }
2574 JVM_END
2575
2576
2577 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2578 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2579 Method* method = ik->methods()->at(method_index);
2580 return method->checked_exceptions_length();
2581 JVM_END
2582
2583
2584 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2585 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2586 Method* method = ik->methods()->at(method_index);
2587 memcpy(code, method->code_base(), method->code_size());
2588 JVM_END
2589
2590
2591 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2592 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2593 Method* method = ik->methods()->at(method_index);
2594 return method->code_size();
2595 JVM_END
2596
2597
2598 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2599 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2600 Method* method = ik->methods()->at(method_index);
2601 ExceptionTable extable(method);
2602 entry->start_pc = extable.start_pc(entry_index);
2603 entry->end_pc = extable.end_pc(entry_index);
2604 entry->handler_pc = extable.handler_pc(entry_index);
2605 entry->catchType = extable.catch_type_index(entry_index);
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2610 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2611 Method* method = ik->methods()->at(method_index);
2612 return method->exception_table_length();
2613 JVM_END
2614
2615
2616 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2617 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2618 Method* method = ik->methods()->at(method_index);
2619 return method->access_flags().as_method_flags();
2620 JVM_END
2621
2622
2623 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2624 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2625 return ik->field_access_flags(field_index);
2626 JVM_END
2627
2628
2629 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2630 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2631 Method* method = ik->methods()->at(method_index);
2632 return method->max_locals();
2633 JVM_END
2634
2635
2636 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2637 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2638 Method* method = ik->methods()->at(method_index);
2639 return method->size_of_parameters();
2640 JVM_END
2641
2642
2643 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2644 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2645 Method* method = ik->methods()->at(method_index);
2646 return method->verifier_max_stack();
2647 JVM_END
2648
2649
2650 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2651 ResourceMark rm(THREAD);
2652 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2653 Method* method = ik->methods()->at(method_index);
2654 return method->is_object_constructor();
2655 JVM_END
2656
2657
2658 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2659 ResourceMark rm(THREAD);
2660 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2661 Method* method = ik->methods()->at(method_index);
2662 return method->is_overpass();
2663 JVM_END
2664
2665 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2666 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2667 Method* method = ik->methods()->at(method_index);
2668 return method->name()->as_utf8();
2669 JVM_END
2670
2671
2672 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2673 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2674 Method* method = ik->methods()->at(method_index);
2675 return method->signature()->as_utf8();
2676 JVM_END
2677
2678 /**
2679 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2680 * read entries in the constant pool. Since the old verifier always
2681 * works on a copy of the code, it will not see any rewriting that
2682 * may possibly occur in the middle of verification. So it is important
2683 * that nothing it calls tries to use the cpCache instead of the raw
2684 * constant pool, so we must use cp->uncached_x methods when appropriate.
2685 */
2686 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2687 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2688 ConstantPool* cp = ik->constants();
2689 switch (cp->tag_at(cp_index).value()) {
2690 case JVM_CONSTANT_Fieldref:
2691 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2692 default:
2693 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2694 }
2695 ShouldNotReachHere();
2696 return nullptr;
2697 JVM_END
2698
2699
2700 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2701 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2702 ConstantPool* cp = ik->constants();
2703 switch (cp->tag_at(cp_index).value()) {
2704 case JVM_CONSTANT_InterfaceMethodref:
2705 case JVM_CONSTANT_Methodref:
2706 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2707 default:
2708 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2709 }
2710 ShouldNotReachHere();
2711 return nullptr;
2712 JVM_END
2713
2714
2715 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2716 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2717 ConstantPool* cp = ik->constants();
2718 switch (cp->tag_at(cp_index).value()) {
2719 case JVM_CONSTANT_InterfaceMethodref:
2720 case JVM_CONSTANT_Methodref:
2721 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2722 default:
2723 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2724 }
2725 ShouldNotReachHere();
2726 return nullptr;
2727 JVM_END
2728
2729
2730 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2731 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2732 ConstantPool* cp = ik->constants();
2733 switch (cp->tag_at(cp_index).value()) {
2734 case JVM_CONSTANT_Fieldref:
2735 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2736 default:
2737 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2738 }
2739 ShouldNotReachHere();
2740 return nullptr;
2741 JVM_END
2742
2743
2744 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2745 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2746 ConstantPool* cp = ik->constants();
2747 Symbol* classname = cp->klass_name_at(cp_index);
2748 return classname->as_utf8();
2749 JVM_END
2750
2751
2752 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2753 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2754 ConstantPool* cp = ik->constants();
2755 switch (cp->tag_at(cp_index).value()) {
2756 case JVM_CONSTANT_Fieldref: {
2757 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2758 Symbol* classname = cp->klass_name_at(class_index);
2759 return classname->as_utf8();
2760 }
2761 default:
2762 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2763 }
2764 ShouldNotReachHere();
2765 return nullptr;
2766 JVM_END
2767
2768
2769 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2770 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2771 ConstantPool* cp = ik->constants();
2772 switch (cp->tag_at(cp_index).value()) {
2773 case JVM_CONSTANT_Methodref:
2774 case JVM_CONSTANT_InterfaceMethodref: {
2775 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2776 Symbol* classname = cp->klass_name_at(class_index);
2777 return classname->as_utf8();
2778 }
2779 default:
2780 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2781 }
2782 ShouldNotReachHere();
2783 return nullptr;
2784 JVM_END
2785
2786
2787 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2788 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2789 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2790 ConstantPool* cp = ik->constants();
2791 ConstantPool* cp_called = ik_called->constants();
2792 switch (cp->tag_at(cp_index).value()) {
2793 case JVM_CONSTANT_Fieldref: {
2794 Symbol* name = cp->uncached_name_ref_at(cp_index);
2795 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2796 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2797 if (fs.name() == name && fs.signature() == signature) {
2798 return fs.access_flags().as_field_flags();
2799 }
2800 }
2801 return -1;
2802 }
2803 default:
2804 fatal("JVM_GetCPFieldModifiers: illegal constant");
2805 }
2806 ShouldNotReachHere();
2807 return 0;
2808 JVM_END
2809
2810
2811 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2812 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2813 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2814 ConstantPool* cp = ik->constants();
2815 switch (cp->tag_at(cp_index).value()) {
2816 case JVM_CONSTANT_Methodref:
2817 case JVM_CONSTANT_InterfaceMethodref: {
2818 Symbol* name = cp->uncached_name_ref_at(cp_index);
2819 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2820 Array<Method*>* methods = ik_called->methods();
2821 int methods_count = methods->length();
2822 for (int i = 0; i < methods_count; i++) {
2823 Method* method = methods->at(i);
2824 if (method->name() == name && method->signature() == signature) {
2825 return method->access_flags().as_method_flags();
2826 }
2827 }
2828 return -1;
2829 }
2830 default:
2831 fatal("JVM_GetCPMethodModifiers: illegal constant");
2832 }
2833 ShouldNotReachHere();
2834 return 0;
2835 JVM_END
2836
2837
2838 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2839
2840 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2841 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2842 JVM_END
2843
2844
2845 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2846 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2847 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2848 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2849 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2850 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2851 JVM_END
2852
2853 // Printing support //////////////////////////////////////////////////
2854 extern "C" {
2855
2856 ATTRIBUTE_PRINTF(3, 0)
2857 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2858 // Reject count values that are negative signed values converted to
2859 // unsigned; see bug 4399518, 4417214
2860 if ((intptr_t)count <= 0) return -1;
2861
2862 int result = os::vsnprintf(str, count, fmt, args);
2863 if (result > 0 && (size_t)result >= count) {
2864 result = -1;
2865 }
2866
2867 return result;
2868 }
2869
2870 ATTRIBUTE_PRINTF(3, 4)
2871 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2872 va_list args;
2873 int len;
2874 va_start(args, fmt);
2875 len = jio_vsnprintf(str, count, fmt, args);
2876 va_end(args);
2877 return len;
2878 }
2879
2880 ATTRIBUTE_PRINTF(2, 3)
2881 int jio_fprintf(FILE* f, const char *fmt, ...) {
2882 int len;
2883 va_list args;
2884 va_start(args, fmt);
2885 len = jio_vfprintf(f, fmt, args);
2886 va_end(args);
2887 return len;
2888 }
2889
2890 ATTRIBUTE_PRINTF(2, 0)
2891 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2892 if (Arguments::vfprintf_hook() != nullptr) {
2893 return Arguments::vfprintf_hook()(f, fmt, args);
2894 } else {
2895 return vfprintf(f, fmt, args);
2896 }
2897 }
2898
2899 ATTRIBUTE_PRINTF(1, 2)
2900 JNIEXPORT int jio_printf(const char *fmt, ...) {
2901 int len;
2902 va_list args;
2903 va_start(args, fmt);
2904 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2905 va_end(args);
2906 return len;
2907 }
2908
2909 // HotSpot specific jio method
2910 void jio_print(const char* s, size_t len) {
2911 // Try to make this function as atomic as possible.
2912 if (Arguments::vfprintf_hook() != nullptr) {
2913 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2914 } else {
2915 // Make an unused local variable to avoid warning from gcc compiler.
2916 bool dummy = os::write(defaultStream::output_fd(), s, len);
2917 }
2918 }
2919
2920 } // Extern C
2921
2922 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2923
2924 // In most of the JVM thread support functions we need to access the
2925 // thread through a ThreadsListHandle to prevent it from exiting and
2926 // being reclaimed while we try to operate on it. The exceptions to this
2927 // rule are when operating on the current thread, or if the monitor of
2928 // the target java.lang.Thread is locked at the Java level - in both
2929 // cases the target cannot exit.
2930
2931 static void thread_entry(JavaThread* thread, TRAPS) {
2932 HandleMark hm(THREAD);
2933 Handle obj(THREAD, thread->threadObj());
2934 JavaValue result(T_VOID);
2935 JavaCalls::call_virtual(&result,
2936 obj,
2937 vmClasses::Thread_klass(),
2938 vmSymbols::run_method_name(),
2939 vmSymbols::void_method_signature(),
2940 THREAD);
2941 }
2942
2943
2944 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2945 #if INCLUDE_CDS
2946 if (CDSConfig::allow_only_single_java_thread()) {
2947 // During java -Xshare:dump, if we allow multiple Java threads to
2948 // execute in parallel, symbols and classes may be loaded in
2949 // random orders which will make the resulting CDS archive
2950 // non-deterministic.
2951 //
2952 // Lucikly, during java -Xshare:dump, it's important to run only
2953 // the code in the main Java thread (which is NOT started here) that
2954 // creates the module graph, etc. It's safe to not start the other
2955 // threads which are launched by class static initializers
2956 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2957 if (log_is_enabled(Info, aot)) {
2958 ResourceMark rm;
2959 oop t = JNIHandles::resolve_non_null(jthread);
2960 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2961 }
2962 return;
2963 }
2964 #endif
2965 JavaThread *native_thread = nullptr;
2966
2967 // We cannot hold the Threads_lock when we throw an exception,
2968 // due to rank ordering issues. Example: we might need to grab the
2969 // Heap_lock while we construct the exception.
2970 bool throw_illegal_thread_state = false;
2971
2972 // We must release the Threads_lock before we can post a jvmti event
2973 // in Thread::start.
2974 {
2975 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2976 // Ensure that the C++ Thread and OSThread structures aren't freed before
2977 // we operate.
2978 MutexLocker ml(Threads_lock);
2979
2980 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2981 // re-starting an already started thread, so we should usually find
2982 // that the JavaThread is null. However for a JNI attached thread
2983 // there is a small window between the Thread object being created
2984 // (with its JavaThread set) and the update to its threadStatus, so we
2985 // have to check for this
2986 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2987 throw_illegal_thread_state = true;
2988 } else {
2989 jlong size =
2990 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2991 // Allocate the C++ Thread structure and create the native thread. The
2992 // stack size retrieved from java is 64-bit signed, but the constructor takes
2993 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2994 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2995 // - Avoid passing negative values which would result in really large stacks.
2996 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2997 size_t sz = size > 0 ? (size_t) size : 0;
2998 native_thread = new JavaThread(&thread_entry, sz);
2999
3000 // At this point it may be possible that no osthread was created for the
3001 // JavaThread due to lack of memory. Check for this situation and throw
3002 // an exception if necessary. Eventually we may want to change this so
3003 // that we only grab the lock if the thread was created successfully -
3004 // then we can also do this check and throw the exception in the
3005 // JavaThread constructor.
3006 if (native_thread->osthread() != nullptr) {
3007 // Note: the current thread is not being used within "prepare".
3008 native_thread->prepare(jthread);
3009 }
3010 }
3011 }
3012
3013 if (throw_illegal_thread_state) {
3014 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3015 }
3016
3017 assert(native_thread != nullptr, "Starting null thread?");
3018
3019 if (native_thread->osthread() == nullptr) {
3020 ResourceMark rm(thread);
3021 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3022 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3023 // No one should hold a reference to the 'native_thread'.
3024 native_thread->smr_delete();
3025 if (JvmtiExport::should_post_resource_exhausted()) {
3026 JvmtiExport::post_resource_exhausted(
3027 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3028 os::native_thread_creation_failed_msg());
3029 }
3030 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3031 os::native_thread_creation_failed_msg());
3032 }
3033
3034 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3035
3036 Thread::start(native_thread);
3037
3038 JVM_END
3039
3040
3041 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3042 ThreadsListHandle tlh(thread);
3043 oop java_thread = nullptr;
3044 JavaThread* receiver = nullptr;
3045 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3046 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3047
3048 if (is_alive) {
3049 // jthread refers to a live JavaThread.
3050 Thread::set_priority(receiver, (ThreadPriority)prio);
3051 }
3052 // Implied else: If the JavaThread hasn't started yet, then the
3053 // priority set in the java.lang.Thread object above will be pushed
3054 // down when it does start.
3055 JVM_END
3056
3057
3058 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3059 HOTSPOT_THREAD_YIELD();
3060 os::naked_yield();
3061 JVM_END
3062
3063 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3064 if (nanos < 0) {
3065 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3066 }
3067
3068 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3069 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3070 }
3071
3072 // Save current thread state and restore it at the end of this block.
3073 // And set new thread state to SLEEPING.
3074 JavaThreadSleepState jtss(thread);
3075
3076 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3077
3078 if (nanos == 0) {
3079 os::naked_yield();
3080 } else {
3081 ThreadState old_state = thread->osthread()->get_state();
3082 thread->osthread()->set_state(SLEEPING);
3083 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3084 // An asynchronous exception could have been thrown on
3085 // us while we were sleeping. We do not overwrite those.
3086 if (!HAS_PENDING_EXCEPTION) {
3087 HOTSPOT_THREAD_SLEEP_END(1);
3088 if (!thread->has_async_exception_condition()) {
3089 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3090 // to properly restore the thread state. That's likely wrong.
3091 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3092 }
3093 }
3094 }
3095 thread->osthread()->set_state(old_state);
3096 }
3097 HOTSPOT_THREAD_SLEEP_END(0);
3098 JVM_END
3099
3100 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3101 oop jthread = thread->threadObj();
3102 assert(jthread != nullptr, "no current carrier thread!");
3103 return JNIHandles::make_local(THREAD, jthread);
3104 JVM_END
3105
3106 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3107 oop theThread = thread->vthread();
3108 assert(theThread != (oop)nullptr, "no current thread!");
3109 return JNIHandles::make_local(THREAD, theThread);
3110 JVM_END
3111
3112 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3113 jobject theThread))
3114 oop threadObj = JNIHandles::resolve(theThread);
3115 thread->set_vthread(threadObj);
3116
3117 // Set _monitor_owner_id of new current Thread
3118 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3119
3120 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3121 JVM_END
3122
3123 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3124 return ThreadIdentifier::unsafe_offset();
3125 JVM_END
3126
3127 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3128 ThreadsListHandle tlh(thread);
3129 JavaThread* receiver = nullptr;
3130 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3131 if (is_alive) {
3132 // jthread refers to a live JavaThread.
3133 receiver->interrupt();
3134 }
3135 JVM_END
3136
3137 // Return true iff the current thread has locked the object passed in
3138
3139 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3140 if (obj == nullptr) {
3141 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3142 }
3143 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3144 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3145 JVM_END
3146
3147 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3148 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3149 return (jobjectArray) JNIHandles::make_local(THREAD, trace);
3150 JVM_END
3151
3152 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3153 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3154 return JNIHandles::make_local(THREAD, snapshot);
3155 JVM_END
3156
3157 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3158 // We don't use a ThreadsListHandle here because the current thread
3159 // must be alive.
3160 oop java_thread = JNIHandles::resolve_non_null(jthread);
3161 JavaThread* thr = java_lang_Thread::thread(java_thread);
3162 if (thread == thr && !thr->has_attached_via_jni()) {
3163 // Thread naming is only supported for the current thread and
3164 // we don't set the name of an attached thread to avoid stepping
3165 // on other programs.
3166 ResourceMark rm(thread);
3167 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3168 os::set_native_thread_name(thread_name);
3169 }
3170 JVM_END
3171
3172 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3173 oop theCache = thread->scopedValueCache();
3174 return JNIHandles::make_local(THREAD, theCache);
3175 JVM_END
3176
3177 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3178 jobject theCache))
3179 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3180 thread->set_scopedValueCache(objs);
3181 JVM_END
3182
3183
3184 // java.lang.Package ////////////////////////////////////////////////////////////////
3185
3186
3187 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3188 ResourceMark rm(THREAD);
3189 JvmtiVMObjectAllocEventCollector oam;
3190 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3191 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3192 return (jstring) JNIHandles::make_local(THREAD, result);
3193 JVM_END
3194
3195
3196 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3197 JvmtiVMObjectAllocEventCollector oam;
3198 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3199 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3200 JVM_END
3201
3202
3203 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3204
3205
3206 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3207 MonitorLocker ml(Heap_lock);
3208 oop ref = Universe::reference_pending_list();
3209 if (ref != nullptr) {
3210 Universe::clear_reference_pending_list();
3211 }
3212 return JNIHandles::make_local(THREAD, ref);
3213 JVM_END
3214
3215 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3216 MonitorLocker ml(Heap_lock);
3217 return Universe::has_reference_pending_list();
3218 JVM_END
3219
3220 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3221 MonitorLocker ml(Heap_lock);
3222 while (!Universe::has_reference_pending_list()) {
3223 ml.wait();
3224 }
3225 JVM_END
3226
3227 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3228 oop ref_oop = JNIHandles::resolve_non_null(ref);
3229 // PhantomReference has its own implementation of get().
3230 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3231 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3232 return JNIHandles::make_local(THREAD, referent);
3233 JVM_END
3234
3235 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3236 oop ref_oop = JNIHandles::resolve_non_null(ref);
3237 // PhantomReference has its own implementation of refersTo().
3238 // See: JVM_PhantomReferenceRefersTo
3239 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3240 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3241 return referent == JNIHandles::resolve(o);
3242 JVM_END
3243
3244 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3245 oop ref_oop = JNIHandles::resolve_non_null(ref);
3246 // FinalReference has it's own implementation of clear().
3247 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3248 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3249 // If the referent has already been cleared then done.
3250 // However, if the referent is dead but has not yet been cleared by
3251 // concurrent reference processing, it should NOT be cleared here.
3252 // Instead, clearing should be left to the GC. Clearing it here could
3253 // detectably lose an expected notification, which is impossible with
3254 // STW reference processing. The clearing in enqueue() doesn't have
3255 // this problem, since the enqueue covers the notification, but it's not
3256 // worth the effort to handle that case specially.
3257 return;
3258 }
3259 java_lang_ref_Reference::clear_referent(ref_oop);
3260 JVM_END
3261
3262
3263 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3264
3265
3266 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3267 oop ref_oop = JNIHandles::resolve_non_null(ref);
3268 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3269 return referent == JNIHandles::resolve(o);
3270 JVM_END
3271
3272
3273 // ObjectInputStream ///////////////////////////////////////////////////////////////
3274
3275 // Return the first user-defined class loader up the execution stack, or null
3276 // if only code from the bootstrap or platform class loader is on the stack.
3277
3278 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3279 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3280 InstanceKlass* ik = vfst.method()->method_holder();
3281 oop loader = ik->class_loader();
3282 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3283 return JNIHandles::make_local(THREAD, loader);
3284 }
3285 }
3286 return nullptr;
3287 JVM_END
3288
3289
3290 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3291
3292
3293 // resolve array handle and check arguments
3294 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3295 if (arr == nullptr) {
3296 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3297 }
3298 oop a = JNIHandles::resolve_non_null(arr);
3299 if (!a->is_array()) {
3300 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3301 } else if (type_array_only && !a->is_typeArray()) {
3302 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3303 }
3304 return arrayOop(a);
3305 }
3306
3307
3308 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3309 arrayOop a = check_array(env, arr, false, CHECK_0);
3310 return a->length();
3311 JVM_END
3312
3313
3314 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3315 JvmtiVMObjectAllocEventCollector oam;
3316 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3317 jvalue value;
3318 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3319 oop box = Reflection::box(&value, type, CHECK_NULL);
3320 return JNIHandles::make_local(THREAD, box);
3321 JVM_END
3322
3323
3324 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3325 jvalue value;
3326 value.i = 0; // to initialize value before getting used in CHECK
3327 arrayOop a = check_array(env, arr, true, CHECK_(value));
3328 assert(a->is_typeArray(), "just checking");
3329 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3330 BasicType wide_type = (BasicType) wCode;
3331 if (type != wide_type) {
3332 Reflection::widen(&value, type, wide_type, CHECK_(value));
3333 }
3334 return value;
3335 JVM_END
3336
3337
3338 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3339 arrayOop a = check_array(env, arr, false, CHECK);
3340 oop box = JNIHandles::resolve(val);
3341 jvalue value;
3342 value.i = 0; // to initialize value before getting used in CHECK
3343 BasicType value_type;
3344 if (a->is_objArray()) {
3345 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3346 value_type = Reflection::unbox_for_regular_object(box, &value);
3347 } else {
3348 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3349 }
3350 Reflection::array_set(&value, a, index, value_type, CHECK);
3351 JVM_END
3352
3353
3354 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3355 arrayOop a = check_array(env, arr, true, CHECK);
3356 assert(a->is_typeArray(), "just checking");
3357 BasicType value_type = (BasicType) vCode;
3358 Reflection::array_set(&v, a, index, value_type, CHECK);
3359 JVM_END
3360
3361
3362 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3363 JvmtiVMObjectAllocEventCollector oam;
3364 oop element_mirror = JNIHandles::resolve(eltClass);
3365 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3366 return JNIHandles::make_local(THREAD, result);
3367 JVM_END
3368
3369
3370 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3371 JvmtiVMObjectAllocEventCollector oam;
3372 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3373 oop element_mirror = JNIHandles::resolve(eltClass);
3374 assert(dim_array->is_typeArray(), "just checking");
3375 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3376 return JNIHandles::make_local(THREAD, result);
3377 JVM_END
3378
3379
3380 // Library support ///////////////////////////////////////////////////////////////////////////
3381
3382 JVM_LEAF(void*, JVM_LoadZipLibrary())
3383 return ZipLibrary::handle();
3384 JVM_END
3385
3386 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3387 //%note jvm_ct
3388 char ebuf[1024];
3389 void *load_result;
3390 {
3391 ThreadToNativeFromVM ttnfvm(thread);
3392 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3393 }
3394 if (load_result == nullptr) {
3395 if (throwException) {
3396 char msg[1024];
3397 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3398 // Since 'ebuf' may contain a string encoded using
3399 // platform encoding scheme, we need to pass
3400 // Exceptions::unsafe_to_utf8 to the new_exception method
3401 // as the last argument. See bug 6367357.
3402 Handle h_exception =
3403 Exceptions::new_exception(thread,
3404 vmSymbols::java_lang_UnsatisfiedLinkError(),
3405 msg, Exceptions::unsafe_to_utf8);
3406
3407 THROW_HANDLE_NULL(h_exception);
3408 } else {
3409 log_info(library)("Failed to load library %s", name);
3410 return load_result;
3411 }
3412 }
3413 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3414 return load_result;
3415 JVM_END
3416
3417
3418 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3419 os::dll_unload(handle);
3420 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3421 JVM_END
3422
3423
3424 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3425 void* find_result = os::dll_lookup(handle, name);
3426 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3427 find_result != nullptr ? "Found" : "Failed to find",
3428 name, p2i(handle));
3429 return find_result;
3430 JVM_END
3431
3432
3433 // JNI version ///////////////////////////////////////////////////////////////////////////////
3434
3435 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3436 return Threads::is_supported_jni_version_including_1_1(version);
3437 JVM_END
3438
3439
3440 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3441 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3442 JVM_END
3443
3444 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3445 return Arguments::is_valhalla_enabled() ? JNI_TRUE : JNI_FALSE;
3446 JVM_END
3447
3448 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3449 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3450 JVM_END
3451
3452 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3453 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3454 JVM_END
3455
3456 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3457 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3458 JVM_END
3459
3460 // String support ///////////////////////////////////////////////////////////////////////////
3461
3462 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3463 JvmtiVMObjectAllocEventCollector oam;
3464 if (str == nullptr) return nullptr;
3465 oop string = JNIHandles::resolve_non_null(str);
3466 oop result = StringTable::intern(string, CHECK_NULL);
3467 return (jstring) JNIHandles::make_local(THREAD, result);
3468 JVM_END
3469
3470
3471 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3472
3473 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3474 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3475 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3476 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3477 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3478 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3479
3480
3481 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3482 VM_Exit::block_if_vm_exited();
3483 return new PlatformMutex();
3484 }
3485
3486
3487 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3488 VM_Exit::block_if_vm_exited();
3489 delete ((PlatformMutex*) mon);
3490 }
3491
3492
3493 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3494 VM_Exit::block_if_vm_exited();
3495 ((PlatformMutex*) mon)->lock();
3496 return 0;
3497 }
3498
3499
3500 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3501 VM_Exit::block_if_vm_exited();
3502 ((PlatformMutex*) mon)->unlock();
3503 }
3504
3505
3506 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3507
3508 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3509 Handle loader, jboolean throwError, TRAPS) {
3510 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3511
3512 // Check if we should initialize the class
3513 if (init && klass->is_instance_klass()) {
3514 klass->initialize(CHECK_NULL);
3515 }
3516 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3517 }
3518
3519
3520 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3521
3522 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3523 Handle method_handle;
3524 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3525 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3526 Handle receiver(THREAD, JNIHandles::resolve(obj));
3527 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3528 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3529
3530 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3531 jobject res = JNIHandles::make_local(THREAD, result);
3532 if (JvmtiExport::should_post_vm_object_alloc()) {
3533 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3534 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3535 if (java_lang_Class::is_primitive(ret_type)) {
3536 // Only for primitive type vm allocates memory for java object.
3537 // See box() method.
3538 JvmtiExport::post_vm_object_alloc(thread, result);
3539 }
3540 }
3541 return res;
3542 } else {
3543 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3544 }
3545 JVM_END
3546
3547
3548 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3549 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3550 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3551 oop constructor_mirror = JNIHandles::resolve(c);
3552 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3553 jobject res = JNIHandles::make_local(THREAD, result);
3554 if (JvmtiExport::should_post_vm_object_alloc()) {
3555 JvmtiExport::post_vm_object_alloc(thread, result);
3556 }
3557 return res;
3558 JVM_END
3559
3560 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3562 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3563 JVM_END
3564
3565 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3566 jclass caller,
3567 jstring interfaceMethodName,
3568 jobject factoryType,
3569 jobject interfaceMethodType,
3570 jobject implementationMember,
3571 jobject dynamicMethodType,
3572 jclass lambdaProxyClass))
3573 #if INCLUDE_CDS
3574 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3575 return;
3576 }
3577
3578 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3579 if (caller_ik->is_hidden()) {
3580 // Hidden classes not of type lambda proxy classes are currently not being archived.
3581 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3582 // registered for archiving.
3583 return;
3584 }
3585 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3586 assert(lambda_ik->is_hidden(), "must be a hidden class");
3587 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3588
3589 Symbol* interface_method_name = nullptr;
3590 if (interfaceMethodName != nullptr) {
3591 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3592 }
3593 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3594 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3595
3596 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3597 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3598
3599 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3600 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3601 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3602
3603 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3604 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3605
3606 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3607 interface_method_type, m, dynamic_method_type, THREAD);
3608 #endif // INCLUDE_CDS
3609 JVM_END
3610
3611 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3612 jclass caller,
3613 jstring interfaceMethodName,
3614 jobject factoryType,
3615 jobject interfaceMethodType,
3616 jobject implementationMember,
3617 jobject dynamicMethodType))
3618 #if INCLUDE_CDS
3619
3620 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3621 implementationMember == nullptr || dynamicMethodType == nullptr) {
3622 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3623 }
3624
3625 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3626 if (!caller_ik->in_aot_cache()) {
3627 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3628 return nullptr;
3629 }
3630
3631 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3632 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3633 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3634
3635 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3636 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3637
3638 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3639 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3640 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3641
3642 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3643 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3644
3645 InstanceKlass* loaded_lambda =
3646 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3647 interface_method_type, m, dynamic_method_type,
3648 CHECK_(nullptr));
3649 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3650 #else
3651 return nullptr;
3652 #endif // INCLUDE_CDS
3653 JVM_END
3654
3655 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3656 if (CDSConfig::is_dumping_static_archive()) {
3657 // We do this so that the default CDS archive can be deterministic.
3658 const char* release = VM_Version::vm_release();
3659 const char* dbg_level = VM_Version::jdk_debug_level();
3660 const char* version = VM_Version::internal_vm_info_string();
3661 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3662 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3663 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3664 seed += (jlong)VM_Version::vm_major_version();
3665 seed += (jlong)VM_Version::vm_minor_version();
3666 seed += (jlong)VM_Version::vm_security_version();
3667 seed += (jlong)VM_Version::vm_patch_version();
3668 if (seed == 0) { // don't let this ever be zero.
3669 seed = 0x87654321;
3670 }
3671 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3672 return seed;
3673 } else {
3674 return 0;
3675 }
3676 JVM_END
3677
3678 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3679 return CDSConfig::get_status();
3680 JVM_END
3681
3682 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3683 #if INCLUDE_CDS
3684 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3685 if (line != nullptr) {
3686 ResourceMark rm(THREAD);
3687 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3688 char* c_line = java_lang_String::as_utf8_string(h_line());
3689 if (CDSConfig::is_dumping_dynamic_archive()) {
3690 // Note: LambdaFormInvokers::append take same format which is not
3691 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3692 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3693 }
3694 if (ClassListWriter::is_enabled()) {
3695 ClassListWriter w;
3696 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3697 }
3698 }
3699 #endif // INCLUDE_CDS
3700 JVM_END
3701
3702 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3703 #if INCLUDE_CDS
3704 ResourceMark rm(THREAD);
3705 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3706 char* file_name = java_lang_String::as_utf8_string(file_handle());
3707 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3708 #endif // INCLUDE_CDS
3709 JVM_END
3710
3711 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3712 #if INCLUDE_CDS
3713 ResourceMark rm(THREAD);
3714 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3715 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3716 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3717 #endif // INCLUDE_CDS
3718 JVM_END
3719
3720 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3721 #if INCLUDE_CDS
3722 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3723 if (!k->is_instance_klass()) {
3724 return false;
3725 } else {
3726 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3727 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3728 // This class will be cached in AOT-initialized state. No need for init barriers.
3729 return false;
3730 } else {
3731 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3732 // must emit barriers to ensure class initialization during production run.
3733 ResourceMark rm(THREAD);
3734 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3735 return true;
3736 }
3737 }
3738 #else
3739 return false;
3740 #endif // INCLUDE_CDS
3741 JVM_END
3742
3743 // Returns an array of all live Thread objects (VM internal JavaThreads,
3744 // jvmti agent threads, and JNI attaching threads are skipped)
3745 // See CR 6404306 regarding JNI attaching threads
3746 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3747 ResourceMark rm(THREAD);
3748 ThreadsListEnumerator tle(THREAD, false, false);
3749 JvmtiVMObjectAllocEventCollector oam;
3750
3751 int num_threads = tle.num_threads();
3752 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3753 objArrayHandle threads_ah(THREAD, r);
3754
3755 for (int i = 0; i < num_threads; i++) {
3756 Handle h = tle.get_threadObj(i);
3757 threads_ah->obj_at_put(i, h());
3758 }
3759
3760 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3761 JVM_END
3762
3763
3764 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3765 // Return StackTraceElement[][], each element is the stack trace of a thread in
3766 // the corresponding entry in the given threads array
3767 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3768 JvmtiVMObjectAllocEventCollector oam;
3769
3770 // Check if threads is null
3771 if (threads == nullptr) {
3772 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3773 }
3774
3775 refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads));
3776 refArrayHandle ah(THREAD, a);
3777 int num_threads = ah->length();
3778 // check if threads is non-empty array
3779 if (num_threads == 0) {
3780 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3781 }
3782
3783 // check if threads is not an array of objects of Thread class
3784 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3785 if (k != vmClasses::Thread_klass()) {
3786 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3787 }
3788
3789 ResourceMark rm(THREAD);
3790
3791 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3792 for (int i = 0; i < num_threads; i++) {
3793 oop thread_obj = ah->obj_at(i);
3794 instanceHandle h(THREAD, (instanceOop) thread_obj);
3795 thread_handle_array->append(h);
3796 }
3797
3798 // The JavaThread references in thread_handle_array are validated
3799 // in VM_ThreadDump::doit().
3800 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3801 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3802
3803 JVM_END
3804
3805 // JVM monitoring and management support
3806 JVM_LEAF(void*, JVM_GetManagement(jint version))
3807 return Management::get_jmm_interface(version);
3808 JVM_END
3809
3810 // com.sun.tools.attach.VirtualMachine agent properties support
3811 //
3812 // Initialize the agent properties with the properties maintained in the VM
3813 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3814 ResourceMark rm;
3815
3816 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3817
3818 PUTPROP(props, "sun.java.command", Arguments::java_command());
3819 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3820 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3821 return properties;
3822 JVM_END
3823
3824 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3825 {
3826 JvmtiVMObjectAllocEventCollector oam;
3827
3828 if (ofClass == nullptr) {
3829 return nullptr;
3830 }
3831 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3832 // Special handling for primitive objects
3833 if (java_lang_Class::is_primitive(mirror())) {
3834 return nullptr;
3835 }
3836 Klass* k = java_lang_Class::as_Klass(mirror());
3837 if (!k->is_instance_klass()) {
3838 return nullptr;
3839 }
3840 InstanceKlass* ik = InstanceKlass::cast(k);
3841 int encl_method_class_idx = ik->enclosing_method_class_index();
3842 if (encl_method_class_idx == 0) {
3843 return nullptr;
3844 }
3845 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3846 objArrayHandle dest(THREAD, dest_o);
3847 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3848 dest->obj_at_put(0, enc_k->java_mirror());
3849 int encl_method_method_idx = ik->enclosing_method_method_index();
3850 if (encl_method_method_idx != 0) {
3851 Symbol* sym = ik->constants()->symbol_at(
3852 extract_low_short_from_int(
3853 ik->constants()->name_and_type_at(encl_method_method_idx)));
3854 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3855 dest->obj_at_put(1, str());
3856 sym = ik->constants()->symbol_at(
3857 extract_high_short_from_int(
3858 ik->constants()->name_and_type_at(encl_method_method_idx)));
3859 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3860 dest->obj_at_put(2, str());
3861 }
3862 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3863 }
3864 JVM_END
3865
3866 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3867 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3868 ResourceMark rm(THREAD);
3869
3870 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3871 return nullptr;
3872 }
3873
3874 char** vm_flags = Arguments::jvm_flags_array();
3875 char** vm_args = Arguments::jvm_args_array();
3876 int num_flags = Arguments::num_jvm_flags();
3877 int num_args = Arguments::num_jvm_args();
3878
3879 InstanceKlass* ik = vmClasses::String_klass();
3880 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3881 objArrayHandle result_h(THREAD, r);
3882
3883 int index = 0;
3884 for (int j = 0; j < num_flags; j++, index++) {
3885 stringStream prefixed;
3886 prefixed.print("-XX:%s", vm_flags[j]);
3887 Handle h = java_lang_String::create_from_platform_dependent_str(prefixed.base(), CHECK_NULL);
3888 result_h->obj_at_put(index, h());
3889 }
3890 for (int i = 0; i < num_args; i++, index++) {
3891 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3892 result_h->obj_at_put(index, h());
3893 }
3894 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3895 JVM_END
3896
3897 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3898 return os::get_signal_number(name);
3899 JVM_END
3900
3901 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread))
3902 oop vt = JNIHandles::resolve_external_guard(vthread);
3903 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/);
3904 JVM_END
3905
3906 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread))
3907 oop vt = JNIHandles::resolve_external_guard(vthread);
3908 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/);
3909 JVM_END
3910
3911 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3912 oop vt = JNIHandles::resolve_external_guard(vthread);
3913 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/);
3914 JVM_END
3915
3916 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3917 oop vt = JNIHandles::resolve_external_guard(vthread);
3918 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/);
3919 JVM_END
3920
3921 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3922 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3923 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3924 #if INCLUDE_JVMTI
3925 if (!DoJVMTIVirtualThreadTransitions) {
3926 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3927 return;
3928 }
3929 assert(thread->is_disable_suspend() != (bool)enter,
3930 "nested or unbalanced monitor enter/exit is not allowed");
3931 thread->toggle_is_disable_suspend();
3932 #endif
3933 JVM_END
3934
3935 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3936 #if INCLUDE_JFR
3937 freeze_result result = THREAD->last_freeze_fail_result();
3938 assert(result != freeze_ok, "sanity check");
3939 EventVirtualThreadPinned event(UNTIMED);
3940 event.set_starttime(THREAD->last_freeze_fail_time());
3941 if (event.should_commit()) {
3942 ResourceMark rm(THREAD);
3943 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3944 THREAD->post_vthread_pinned_event(&event, str, result);
3945 }
3946 #endif
3947 JVM_END
3948
3949 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3950 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3951 assert(parkEvent != nullptr, "not initialized");
3952
3953 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3954 oop vthread_head = nullptr;
3955 while (true) {
3956 if (list_head.peek() != nullptr) {
3957 for (;;) {
3958 oop head = list_head.resolve();
3959 if (list_head.cmpxchg(head, nullptr) == head) {
3960 return JNIHandles::make_local(THREAD, head);
3961 }
3962 }
3963 }
3964 ThreadBlockInVM tbivm(THREAD);
3965 parkEvent->park();
3966 }
3967 JVM_END
3968
3969 /*
3970 * Return the current class's class file version. The low order 16 bits of the
3971 * returned jint contain the class's major version. The high order 16 bits
3972 * contain the class's minor version.
3973 */
3974 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3975 oop mirror = JNIHandles::resolve_non_null(current);
3976 if (java_lang_Class::is_primitive(mirror)) {
3977 // return latest major version and minor version of 0.
3978 return JVM_CLASSFILE_MAJOR_VERSION;
3979 }
3980 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3981 return (ik->minor_version() << 16) | ik->major_version();
3982 JVM_END
3983
3984 /*
3985 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3986 * get the value will see a materialized value and not a scalar-replaced
3987 * null value.
3988 */
3989 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3990 JVM_EnsureMaterializedForStackWalk(env, value);
3991 JVM_END
3992
3993 /*
3994 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3995 */
3996 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3997 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3998 JVM_END