1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/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/instanceKlass.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/objArrayKlass.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/oop.inline.hpp"
68 #include "oops/recordComponent.hpp"
69 #include "oops/refArrayOop.inline.hpp"
70 #include "prims/foreignGlobals.hpp"
71 #include "prims/jvm_misc.hpp"
72 #include "prims/jvmtiExport.hpp"
73 #include "prims/jvmtiThreadState.inline.hpp"
74 #include "prims/stackwalk.hpp"
75 #include "runtime/arguments.hpp"
76 #include "runtime/atomicAccess.hpp"
77 #include "runtime/continuation.hpp"
78 #include "runtime/deoptimization.hpp"
79 #include "runtime/globals_extension.hpp"
80 #include "runtime/handles.inline.hpp"
81 #include "runtime/handshake.hpp"
82 #include "runtime/init.hpp"
83 #include "runtime/interfaceSupport.inline.hpp"
84 #include "runtime/java.hpp"
85 #include "runtime/javaCalls.hpp"
86 #include "runtime/javaThread.hpp"
87 #include "runtime/jfieldIDWorkaround.hpp"
88 #include "runtime/jniHandles.inline.hpp"
89 #include "runtime/mountUnmountDisabler.hpp"
90 #include "runtime/os.inline.hpp"
91 #include "runtime/osThread.hpp"
92 #include "runtime/perfData.hpp"
93 #include "runtime/reflection.hpp"
94 #include "runtime/synchronizer.hpp"
95 #include "runtime/threadIdentifier.hpp"
96 #include "runtime/threadSMR.hpp"
97 #include "runtime/vframe.inline.hpp"
98 #include "runtime/vm_version.hpp"
99 #include "runtime/vmOperations.hpp"
100 #include "services/attachListener.hpp"
101 #include "services/management.hpp"
102 #include "services/threadService.hpp"
103 #include "utilities/checkedCast.hpp"
104 #include "utilities/copy.hpp"
105 #include "utilities/defaultStream.hpp"
106 #include "utilities/dtrace.hpp"
107 #include "utilities/events.hpp"
108 #include "utilities/macros.hpp"
109 #include "utilities/utf8.hpp"
110 #include "utilities/zipLibrary.hpp"
111 #if INCLUDE_CDS
112 #include "classfile/systemDictionaryShared.hpp"
113 #endif
114 #if INCLUDE_JFR
115 #include "jfr/jfr.hpp"
116 #endif
117 #if INCLUDE_MANAGEMENT
118 #include "services/finalizerService.hpp"
119 #endif
120 #ifdef LINUX
121 #include "osContainer_linux.hpp"
122 #endif
123
124 #include <errno.h>
125
126 /*
127 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
128 such ctors and calls MUST NOT come between an oop declaration/init and its
129 usage because if objects are move this may cause various memory stomps, bus
130 errors and segfaults. Here is a cookbook for causing so called "naked oop
131 failures":
132
133 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
134 // Object address to be held directly in mirror & not visible to GC
135 oop mirror = JNIHandles::resolve_non_null(ofClass);
136
137 // If this ctor can hit a safepoint, moving objects around, then
138 ComplexConstructor foo;
139
140 // Boom! mirror may point to JUNK instead of the intended object
141 (some dereference of mirror)
142
143 // Here's another call that may block for GC, making mirror stale
144 MutexLocker ml(some_lock);
145
146 // And here's an initializer that can result in a stale oop
147 // all in one step.
148 oop o = call_that_can_throw_exception(TRAPS);
149
150
151 The solution is to keep the oop declaration BELOW the ctor or function
152 call that might cause a GC, do another resolve to reassign the oop, or
153 consider use of a Handle instead of an oop so there is immunity from object
154 motion. But note that the "QUICK" entries below do not have a handlemark
155 and thus can only support use of handles passed in.
156 */
157
158 extern void trace_class_resolution(Klass* to_class) {
159 ResourceMark rm;
160 int line_number = -1;
161 const char * source_file = nullptr;
162 const char * trace = "explicit";
163 InstanceKlass* caller = nullptr;
164 JavaThread* jthread = JavaThread::current();
165 if (jthread->has_last_Java_frame()) {
166 vframeStream vfst(jthread);
167
168 // Scan up the stack skipping ClassLoader frames.
169 Method* last_caller = nullptr;
170
171 while (!vfst.at_end()) {
172 Method* m = vfst.method();
173 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
174 break;
175 }
176 last_caller = m;
177 vfst.next();
178 }
179 // if this is called from Class.forName0 and that is called from Class.forName,
180 // then print the caller of Class.forName. If this is Class.loadClass, then print
181 // that caller, otherwise keep quiet since this should be picked up elsewhere.
182 bool found_it = false;
183 if (!vfst.at_end() &&
184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
185 vfst.method()->name() == vmSymbols::forName0_name()) {
186 vfst.next();
187 if (!vfst.at_end() &&
188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
189 vfst.method()->name() == vmSymbols::forName_name()) {
190 vfst.next();
191 found_it = true;
192 }
193 } else if (last_caller != nullptr &&
194 last_caller->method_holder()->name() ==
195 vmSymbols::java_lang_ClassLoader() &&
196 last_caller->name() == vmSymbols::loadClass_name()) {
197 found_it = true;
198 } else if (!vfst.at_end()) {
199 if (vfst.method()->is_native()) {
200 // JNI call
201 found_it = true;
202 }
203 }
204 if (found_it && !vfst.at_end()) {
205 // found the caller
206 caller = vfst.method()->method_holder();
207 line_number = vfst.method()->line_number_from_bci(vfst.bci());
208 if (line_number == -1) {
209 // show method name if it's a native method
210 trace = vfst.method()->name_and_sig_as_C_string();
211 }
212 Symbol* s = caller->source_file_name();
213 if (s != nullptr) {
214 source_file = s->as_C_string();
215 }
216 }
217 }
218 if (caller != nullptr) {
219 if (to_class != caller) {
220 const char * from = caller->external_name();
221 const char * to = to_class->external_name();
222 // print in a single call to reduce interleaving between threads
223 if (source_file != nullptr) {
224 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
225 } else {
226 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
227 }
228 }
229 }
230 }
231
232 // java.lang.System //////////////////////////////////////////////////////////////////////
233
234 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env))
235 #if INCLUDE_CDS
236 if (CDSConfig::is_dumping_preimage_static_archive()) {
237 if (!AOTMetaspace::preimage_static_archive_dumped()) {
238 AOTMetaspace::dump_static_archive(THREAD);
239 return JNI_TRUE;
240 }
241 }
242 return JNI_FALSE;
243 #else
244 return JNI_FALSE;
245 #endif // INCLUDE_CDS
246 JVM_END
247
248 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
249 return os::javaTimeMillis();
250 JVM_END
251
252 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
253 return os::javaTimeNanos();
254 JVM_END
255
256 // The function below is actually exposed by jdk.internal.misc.VM and not
257 // java.lang.System, but we choose to keep it here so that it stays next
258 // to JVM_CurrentTimeMillis and JVM_NanoTime
259
260 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
261 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
262
263 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
264 jlong seconds;
265 jlong nanos;
266
267 os::javaTimeSystemUTC(seconds, nanos);
268
269 // We're going to verify that the result can fit in a long.
270 // For that we need the difference in seconds between 'seconds'
271 // and 'offset_secs' to be such that:
272 // |seconds - offset_secs| < (2^63/10^9)
273 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
274 // which makes |seconds - offset_secs| < 2^33
275 // and we will prefer +/- 2^32 as the maximum acceptable diff
276 // as 2^32 has a more natural feel than 2^33...
277 //
278 // So if |seconds - offset_secs| >= 2^32 - we return a special
279 // sentinel value (-1) which the caller should take as an
280 // exception value indicating that the offset given to us is
281 // too far from range of the current time - leading to too big
282 // a nano adjustment. The caller is expected to recover by
283 // computing a more accurate offset and calling this method
284 // again. (For the record 2^32 secs is ~136 years, so that
285 // should rarely happen)
286 //
287 jlong diff = seconds - offset_secs;
288 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
289 return -1; // sentinel value: the offset is too far off the target
290 }
291
292 // return the adjustment. If you compute a time by adding
293 // this number of nanoseconds along with the number of seconds
294 // in the offset you should get the current UTC time.
295 return (diff * (jlong)1000000000) + nanos;
296 JVM_END
297
298 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
299 jobject dst, jint dst_pos, jint length))
300 // Check if we have null pointers
301 if (src == nullptr || dst == nullptr) {
302 THROW(vmSymbols::java_lang_NullPointerException());
303 }
304 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
305 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
306 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
307 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
308 // Do copy
309 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
310 JVM_END
311
312
313 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
314 JavaValue r(T_OBJECT);
315 // public synchronized Object put(Object key, Object value);
316 HandleMark hm(THREAD);
317 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
318 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
319 JavaCalls::call_virtual(&r,
320 props,
321 vmClasses::Properties_klass(),
322 vmSymbols::put_name(),
323 vmSymbols::object_object_object_signature(),
324 key_str,
325 value_str,
326 THREAD);
327 }
328
329
330 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
331
332 /*
333 * Return all of the system properties in a Java String array with alternating
334 * names and values from the jvm SystemProperty.
335 * Which includes some internal and all commandline -D defined properties.
336 */
337 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
338 ResourceMark rm(THREAD);
339 HandleMark hm(THREAD);
340 int ndx = 0;
341 int fixedCount = 2;
342
343 SystemProperty* p = Arguments::system_properties();
344 int count = Arguments::PropertyList_count(p);
345
346 // Allocate result String array
347 InstanceKlass* ik = vmClasses::String_klass();
348 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
349 objArrayHandle result_h(THREAD, r);
350
351 while (p != nullptr) {
352 const char * key = p->key();
353 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
354 const char * value = p->value();
355 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
356 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
357 result_h->obj_at_put(ndx * 2, key_str());
358 result_h->obj_at_put(ndx * 2 + 1, value_str());
359 ndx++;
360 }
361 p = p->next();
362 }
363
364 // Convert the -XX:MaxDirectMemorySize= command line flag
365 // to the sun.nio.MaxDirectMemorySize property.
366 // Do this after setting user properties to prevent people
367 // from setting the value with a -D option, as requested.
368 // Leave empty if not supplied
369 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
370 char as_chars[256];
371 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
372 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
373 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
374 result_h->obj_at_put(ndx * 2, key_str());
375 result_h->obj_at_put(ndx * 2 + 1, value_str());
376 ndx++;
377 }
378
379 // JVM monitoring and management support
380 // Add the sun.management.compiler property for the compiler's name
381 {
382 #undef CSIZE
383 #if defined(_LP64)
384 #define CSIZE "64-Bit "
385 #else
386 #define CSIZE
387 #endif // 64bit
388
389 #if COMPILER1_AND_COMPILER2
390 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
391 #else
392 #if defined(COMPILER1)
393 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
394 #elif defined(COMPILER2)
395 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
396 #elif INCLUDE_JVMCI
397 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
398 #else
399 const char* compiler_name = "";
400 #endif // compilers
401 #endif // COMPILER1_AND_COMPILER2
402
403 if (*compiler_name != '\0' &&
404 (Arguments::mode() != Arguments::_int)) {
405 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
406 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
407 result_h->obj_at_put(ndx * 2, key_str());
408 result_h->obj_at_put(ndx * 2 + 1, value_str());
409 ndx++;
410 }
411 }
412
413 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
414 JVM_END
415
416
417 /*
418 * Return the temporary directory that the VM uses for the attach
419 * and perf data files.
420 *
421 * It is important that this directory is well-known and the
422 * same for all VM instances. It cannot be affected by configuration
423 * variables such as java.io.tmpdir.
424 */
425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
426 HandleMark hm(THREAD);
427 const char* temp_dir = os::get_temp_directory();
428 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
429 return (jstring) JNIHandles::make_local(THREAD, h());
430 JVM_END
431
432 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
433 if (len < 0) {
434 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
435 }
436 elmClass->initialize(CHECK);
437 if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
438 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
439 }
440 if (elmClass->is_abstract()) {
441 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
442 }
443 }
444
445 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
446 oop o = JNIHandles::resolve_non_null(orig);
447 assert(o->is_array(), "Must be");
448 oop array = nullptr;
449 arrayOop org = (arrayOop)o;
450 arrayHandle oh(THREAD, org);
451 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
452 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
453 int len = to - from; // length of the new array
454 if (ak->is_null_free_array_klass()) {
455 if ((len != 0) && (from >= org->length() || to > org->length())) {
456 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
457 }
458 }
459 if (org->is_flatArray()) {
460 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
461 LayoutKind lk = fak->layout_kind();
462 ArrayKlass::ArrayProperties props = ArrayKlass::array_properties_from_layout(lk);
463 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
464 arrayHandle ah(THREAD, (arrayOop)array);
465 int end = to < oh()->length() ? to : oh()->length();
466 for (int i = from; i < end; i++) {
467 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
468 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
469 vk->copy_payload_to_addr(src, dst, lk, false);
470 }
471 array = ah();
472 } else {
473 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
474 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
475 int end = to < oh()->length() ? to : oh()->length();
476 for (int i = from; i < end; i++) {
477 if (i < ((objArrayOop)oh())->length()) {
478 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
479 } else {
480 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
481 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
482 }
483 }
484 }
485 return (jarray) JNIHandles::make_local(THREAD, array);
486 JVM_END
487
488 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
489 oop mirror = JNIHandles::resolve_non_null(elmClass);
490 oop init = JNIHandles::resolve(initVal);
491 if (init == nullptr) {
492 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
493 }
494 Handle init_h(THREAD, init);
495 Klass* klass = java_lang_Class::as_Klass(mirror);
496 if (klass != init_h()->klass()) {
497 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
498 }
499 validate_array_arguments(klass, len, CHECK_NULL);
500 InlineKlass* vk = InlineKlass::cast(klass);
501 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
502 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
503 for (int i = 0; i < len; i++) {
504 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
505 }
506 return (jarray) JNIHandles::make_local(THREAD, array);
507 JVM_END
508
509 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
510 oop mirror = JNIHandles::resolve_non_null(elmClass);
511 oop init = JNIHandles::resolve(initVal);
512 if (init == nullptr) {
513 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
514 }
515 Handle init_h(THREAD, init);
516 Klass* klass = java_lang_Class::as_Klass(mirror);
517 if (klass != init_h()->klass()) {
518 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
519 }
520 validate_array_arguments(klass, len, CHECK_NULL);
521 InlineKlass* vk = InlineKlass::cast(klass);
522 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
523 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
524 for (int i = 0; i < len; i++) {
525 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
526 }
527 return (jarray) JNIHandles::make_local(THREAD, array);
528 JVM_END
529
530 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
531 oop mirror = JNIHandles::resolve_non_null(elmClass);
532 Klass* klass = java_lang_Class::as_Klass(mirror);
533 klass->initialize(CHECK_NULL);
534 validate_array_arguments(klass, len, CHECK_NULL);
535 InlineKlass* vk = InlineKlass::cast(klass);
536 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
537 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
538 return (jarray) JNIHandles::make_local(THREAD, array);
539 JVM_END
540
541 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
542 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
543 return oop->is_flatArray();
544 JVM_END
545
546 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
547 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
548 return oop->is_null_free_array();
549 JVM_END
550
551 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
552 // There are multiple cases where an array can/must support atomic access:
553 // - the array is a reference array
554 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT
555 // - the array is flat and its component type is naturally atomic
556 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
557 if (oop->is_refArray()) return true;
558 if (oop->is_flatArray()) {
559 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
560 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) return true;
561 if (fak->element_klass()->is_naturally_atomic()) return true;
562 }
563 return false;
564 JVM_END
565
566 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
567
568 extern volatile jint vm_created;
569
570 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
571 EventShutdown event;
572 if (event.should_commit()) {
573 event.set_reason("Shutdown requested from Java");
574 event.commit();
575 }
576 JVM_END
577
578
579 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
580 before_exit(thread, true);
581 vm_exit(code);
582 JVM_END
583
584
585 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
586 if (!DisableExplicitGC) {
587 EventSystemGC event;
588 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
589 Universe::heap()->collect(GCCause::_java_lang_system_gc);
590 event.commit();
591 }
592 JVM_END
593
594
595 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
596 return Universe::heap()->millis_since_last_whole_heap_examined();
597 JVM_END
598
599
600 static inline jlong convert_size_t_to_jlong(size_t val) {
601 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
602 NOT_LP64 (return (jlong)val;)
603 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
604 }
605
606 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
607 size_t n = Universe::heap()->capacity();
608 return convert_size_t_to_jlong(n);
609 JVM_END
610
611
612 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
613 size_t n = Universe::heap()->unused();
614 return convert_size_t_to_jlong(n);
615 JVM_END
616
617
618 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
619 size_t n = Universe::heap()->max_capacity();
620 return convert_size_t_to_jlong(n);
621 JVM_END
622
623
624 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
625 return os::active_processor_count();
626 JVM_END
627
628 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
629 #ifdef LINUX
630 if (UseContainerSupport) {
631 return JNI_TRUE;
632 }
633 #endif
634 return JNI_FALSE;
635 JVM_END
636
637 JVM_LEAF(jboolean, JVM_IsContainerized(void))
638 #ifdef LINUX
639 if (OSContainer::is_containerized()) {
640 return JNI_TRUE;
641 }
642 #endif
643 return JNI_FALSE;
644 JVM_END
645
646 // java.lang.Throwable //////////////////////////////////////////////////////
647
648 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
649 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
650 java_lang_Throwable::fill_in_stack_trace(exception);
651 JVM_END
652
653 // java.lang.NullPointerException ///////////////////////////////////////////
654
655 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
656 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
657
658 oop exc = JNIHandles::resolve_non_null(throwable);
659
660 Method* method;
661 int bci;
662 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
663 return nullptr;
664 }
665 if (method->is_native()) {
666 return nullptr;
667 }
668
669 stringStream ss;
670 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
671 if (ok) {
672 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
673 return (jstring) JNIHandles::make_local(THREAD, result);
674 } else {
675 return nullptr;
676 }
677 JVM_END
678
679 // java.lang.StackTraceElement //////////////////////////////////////////////
680
681
682 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
683 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
684 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
685 objArrayHandle stack_trace(THREAD, st);
686 // Fill in the allocated stack trace
687 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
688 JVM_END
689
690
691 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
692 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
693 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
694 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
695 JVM_END
696
697
698 // java.lang.StackWalker //////////////////////////////////////////////////////
699 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
700 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
701
702 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
703 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
704 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
705 if (!have_name) {
706 oop name = StringTable::intern(method->name(), CHECK);
707 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
708 }
709 if (!have_type) {
710 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
711 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
712 }
713 JVM_END
714
715 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
716 jint skip_frames, jobject contScope, jobject cont,
717 jint buffer_size, jint start_index, jobjectArray frames))
718 if (!thread->has_last_Java_frame()) {
719 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
720 }
721
722 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
723 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
724 Handle cont_h(THREAD, JNIHandles::resolve(cont));
725 // frames array is a ClassFrameInfo[] array when only getting caller reference,
726 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
727 // be null.
728 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
729 objArrayHandle frames_array_h(THREAD, fa);
730
731 if (frames_array_h->length() < buffer_size) {
732 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
733 }
734
735 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
736 buffer_size, start_index, frames_array_h, CHECK_NULL);
737 return JNIHandles::make_local(THREAD, result);
738 JVM_END
739
740
741 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
742 jint last_batch_count, jint buffer_size, jint start_index,
743 jobjectArray frames))
744 // frames array is a ClassFrameInfo[] array when only getting caller reference,
745 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
746 // be null.
747 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
748 objArrayHandle frames_array_h(THREAD, fa);
749
750 if (frames_array_h->length() < buffer_size) {
751 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
752 }
753
754 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
755 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
756 start_index, frames_array_h, THREAD);
757 JVM_END
758
759 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
760 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
761 objArrayHandle frames_array_h(THREAD, fa);
762 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
763 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
764
765 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
766 JVM_END
767
768 // java.lang.Object ///////////////////////////////////////////////
769
770
771 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
772 // as implemented in the classic virtual machine; return 0 if object is null
773 if (handle == nullptr) {
774 return 0;
775 }
776 oop obj = JNIHandles::resolve_non_null(handle);
777 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) {
778 JavaValue result(T_INT);
779 JavaCallArguments args;
780 Handle ho(THREAD, obj);
781 args.push_oop(ho);
782 methodHandle method(THREAD, UseAltSubstitutabilityMethod
783 ? Universe::value_object_hash_codeAlt_method() : Universe::value_object_hash_code_method());
784 JavaCalls::call(&result, method, &args, THREAD);
785 if (HAS_PENDING_EXCEPTION) {
786 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
787 Handle e(THREAD, PENDING_EXCEPTION);
788 CLEAR_PENDING_EXCEPTION;
789 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
790 }
791 }
792 return result.get_jint();
793 } else {
794 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
795 }
796 JVM_END
797
798
799 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
800 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
801 ObjectSynchronizer::wait(obj, ms, CHECK);
802 JVM_END
803
804
805 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
806 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
807 ObjectSynchronizer::notify(obj, CHECK);
808 JVM_END
809
810
811 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
812 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
813 ObjectSynchronizer::notifyall(obj, CHECK);
814 JVM_END
815
816
817 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
818 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
819 Klass* klass = obj->klass();
820 JvmtiVMObjectAllocEventCollector oam;
821
822 #ifdef ASSERT
823 // Just checking that the cloneable flag is set correct
824 if (obj->is_array()) {
825 guarantee(klass->is_cloneable(), "all arrays are cloneable");
826 } else {
827 guarantee(obj->is_instance(), "should be instanceOop");
828 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
829 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
830 }
831 #endif
832
833 // Check if class of obj supports the Cloneable interface.
834 // All arrays are considered to be cloneable (See JLS 20.1.5).
835 // All j.l.r.Reference classes are considered non-cloneable.
836 if (!klass->is_cloneable() ||
837 (klass->is_instance_klass() &&
838 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
839 ResourceMark rm(THREAD);
840 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
841 }
842
843 if (klass->is_inline_klass()) {
844 // Value instances have no identity, so return the current instance instead of allocating a new one
845 // Value classes cannot have finalizers, so the method can return immediately
846 return JNIHandles::make_local(THREAD, obj());
847 }
848
849 // Make shallow object copy
850 const size_t size = obj->size();
851 oop new_obj_oop = nullptr;
852 if (obj->is_array()) {
853 const int length = ((arrayOop)obj())->length();
854 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
855 /* do_zero */ true, CHECK_NULL);
856 } else {
857 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
858 }
859
860 HeapAccess<>::clone(obj(), new_obj_oop, size);
861
862 Handle new_obj(THREAD, new_obj_oop);
863 // Caution: this involves a java upcall, so the clone should be
864 // "gc-robust" by this stage.
865 if (klass->has_finalizer()) {
866 assert(obj->is_instance(), "should be instanceOop");
867 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
868 new_obj = Handle(THREAD, new_obj_oop);
869 }
870
871 return JNIHandles::make_local(THREAD, new_obj());
872 JVM_END
873
874 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
875
876 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
877 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
878 JVM_END
879
880 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
881 return InstanceKlass::is_finalization_enabled();
882 JVM_END
883
884 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
885
886 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
887 CONT_RegisterNativeMethods(env, cls);
888 JVM_END
889
890 // java.io.File ///////////////////////////////////////////////////////////////
891
892 JVM_LEAF(char*, JVM_NativePath(char* path))
893 return os::native_path(path);
894 JVM_END
895
896
897 // Misc. class handling ///////////////////////////////////////////////////////////
898
899
900 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
901 // Getting the class of the caller frame.
902 //
903 // The call stack at this point looks something like this:
904 //
905 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
906 // [1] [ @CallerSensitive API.method ]
907 // [.] [ (skipped intermediate frames) ]
908 // [n] [ caller ]
909 vframeStream vfst(thread);
910 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
911 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
912 Method* m = vfst.method();
913 assert(m != nullptr, "sanity");
914 switch (n) {
915 case 0:
916 // This must only be called from Reflection.getCallerClass
917 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
918 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
919 }
920 // fall-through
921 case 1:
922 // Frame 0 and 1 must be caller sensitive.
923 if (!m->caller_sensitive()) {
924 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
925 }
926 break;
927 default:
928 if (!m->is_ignored_by_security_stack_walk()) {
929 // We have reached the desired frame; return the holder class.
930 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
931 }
932 break;
933 }
934 }
935 return nullptr;
936 JVM_END
937
938
939 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
940 oop mirror = nullptr;
941 BasicType t = name2type(utf);
942 if (t != T_ILLEGAL && !is_reference_type(t)) {
943 mirror = Universe::java_mirror(t);
944 }
945 if (mirror == nullptr) {
946 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
947 } else {
948 return (jclass) JNIHandles::make_local(THREAD, mirror);
949 }
950 JVM_END
951
952
953 // Returns a class loaded by the bootstrap class loader; or null
954 // if not found. ClassNotFoundException is not thrown.
955 // FindClassFromBootLoader is exported to the launcher for windows.
956 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
957 const char* name))
958 // Java libraries should ensure that name is never null or illegal.
959 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
960 // It's impossible to create this class; the name cannot fit
961 // into the constant pool.
962 return nullptr;
963 }
964 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
965
966 TempNewSymbol h_name = SymbolTable::new_symbol(name);
967 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
968 if (k == nullptr) {
969 return nullptr;
970 }
971
972 if (log_is_enabled(Debug, class, resolve)) {
973 trace_class_resolution(k);
974 }
975 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
976 JVM_END
977
978 // Find a class with this name in this loader.
979 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
980 jboolean init, jobject loader))
981 TempNewSymbol h_name =
982 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
983 CHECK_NULL);
984
985 oop loader_oop = JNIHandles::resolve(loader);
986 Handle h_loader(THREAD, loader_oop);
987
988 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
989 false, THREAD);
990
991 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
992 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
993 }
994 return result;
995 JVM_END
996
997 // Currently only called from the old verifier.
998 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
999 jboolean init, jclass from))
1000 TempNewSymbol h_name =
1001 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1002 CHECK_NULL);
1003 oop from_class_oop = JNIHandles::resolve(from);
1004 assert(from_class_oop != nullptr, "must be");
1005 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1006 assert(from_class != nullptr, "must be");
1007 oop class_loader = from_class->class_loader();
1008
1009 Handle h_loader(THREAD, class_loader);
1010 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1011
1012 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1013 // this function is generally only used for class loading during verification.
1014 ResourceMark rm;
1015 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1016 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1017 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1018 }
1019
1020 #if INCLUDE_CDS
1021 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1022 InstanceKlass* ik = InstanceKlass::cast(from_class);
1023 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1024 }
1025 #endif
1026
1027 return result;
1028 JVM_END
1029
1030 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1031 static jclass jvm_define_class_common(const char *name,
1032 jobject loader, const jbyte *buf,
1033 jsize len, jobject pd, const char *source,
1034 TRAPS) {
1035 if (source == nullptr) source = "__JVM_DefineClass__";
1036
1037 JavaThread* jt = THREAD;
1038
1039 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1040 ClassLoader::perf_define_appclass_selftime(),
1041 ClassLoader::perf_define_appclasses(),
1042 jt->get_thread_stat()->perf_recursion_counts_addr(),
1043 jt->get_thread_stat()->perf_timers_addr(),
1044 PerfClassTraceTime::DEFINE_CLASS);
1045
1046 if (UsePerfData) {
1047 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1048 }
1049
1050 // Class resolution will get the class name from the .class stream if the name is null.
1051 TempNewSymbol class_name = name == nullptr ? nullptr :
1052 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1053 CHECK_NULL);
1054
1055 ResourceMark rm(THREAD);
1056 ClassFileStream st((u1*)buf, len, source);
1057 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1058 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1059 ClassLoadInfo cl_info(protection_domain);
1060 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1061 class_loader,
1062 cl_info,
1063 CHECK_NULL);
1064
1065 if (log_is_enabled(Debug, class, resolve)) {
1066 trace_class_resolution(k);
1067 }
1068
1069 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1070 }
1071
1072 enum {
1073 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1074 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1075 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1076 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1077 };
1078
1079 /*
1080 * Define a class with the specified flags that indicates if it's a nestmate,
1081 * hidden, or strongly referenced from class loader.
1082 */
1083 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1084 const jbyte *buf, jsize len, jobject pd,
1085 jboolean init, int flags, jobject classData, TRAPS) {
1086 ResourceMark rm(THREAD);
1087
1088 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1089 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1090 if (lookup_k == nullptr) {
1091 // The error message is wrong. We come here only if lookup is a primitive class
1092 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1093 }
1094
1095 Handle class_loader (THREAD, lookup_k->class_loader());
1096
1097 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1098 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1099 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1100 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1101
1102 InstanceKlass* host_class = nullptr;
1103 if (is_nestmate) {
1104 host_class = lookup_k->nest_host(CHECK_NULL);
1105 }
1106
1107 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1108 name,
1109 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1110 is_nestmate ? host_class->external_name() : "",
1111 is_hidden ? "hidden" : "not hidden",
1112 is_strong ? "strong" : "weak",
1113 vm_annotations ? "with vm annotations" : "without vm annotation");
1114
1115 if (!is_hidden) {
1116 // classData is only applicable for hidden classes
1117 if (classData != nullptr) {
1118 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1119 }
1120 if (is_nestmate) {
1121 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1122 }
1123 if (!is_strong) {
1124 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1125 }
1126 if (vm_annotations) {
1127 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1128 }
1129 if (flags != STRONG_LOADER_LINK) {
1130 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1131 err_msg("invalid flag 0x%x", flags));
1132 }
1133 }
1134
1135 // Class resolution will get the class name from the .class stream if the name is null.
1136 TempNewSymbol class_name = name == nullptr ? nullptr :
1137 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1138 CHECK_NULL);
1139
1140 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1141 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1142 ClassFileStream st((u1*)buf, len, source);
1143
1144 InstanceKlass* ik = nullptr;
1145 if (!is_hidden) {
1146 ClassLoadInfo cl_info(protection_domain);
1147 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1148 class_loader,
1149 cl_info,
1150 CHECK_NULL);
1151
1152 if (log_is_enabled(Debug, class, resolve)) {
1153 trace_class_resolution(ik);
1154 }
1155 } else { // hidden
1156 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1157 ClassLoadInfo cl_info(protection_domain,
1158 host_class,
1159 classData_h,
1160 is_hidden,
1161 is_strong,
1162 vm_annotations);
1163 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1164 class_loader,
1165 cl_info,
1166 CHECK_NULL);
1167
1168 // The hidden class loader data has been artificially been kept alive to
1169 // this point. The mirror and any instances of this class have to keep
1170 // it alive afterwards.
1171 ik->class_loader_data()->dec_keep_alive_ref_count();
1172
1173 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1174 ModuleEntry* module = ik->module();
1175 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1176 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1177 module_name,
1178 ik->external_name(),
1179 host_class->external_name(),
1180 ik->is_hidden() ? "is hidden" : "is not hidden");
1181 }
1182 }
1183
1184 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1185 // non-hidden class or nestmate class must be in the same package as the Lookup class
1186 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1187 }
1188
1189 if (init) {
1190 ik->initialize(CHECK_NULL);
1191 } else {
1192 ik->link_class(CHECK_NULL);
1193 }
1194
1195 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1196 }
1197
1198 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1199 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1200 JVM_END
1201
1202 /*
1203 * Define a class with the specified lookup class.
1204 * lookup: Lookup class
1205 * name: the name of the class
1206 * buf: class bytes
1207 * len: length of class bytes
1208 * pd: protection domain
1209 * init: initialize the class
1210 * flags: properties of the class
1211 * classData: private static pre-initialized field
1212 */
1213 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1214 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1215
1216 if (lookup == nullptr) {
1217 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1218 }
1219
1220 assert(buf != nullptr, "buf must not be null");
1221
1222 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1223 JVM_END
1224
1225 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1226
1227 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1228 JVM_END
1229
1230 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1231 ResourceMark rm(THREAD);
1232
1233 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1234 char* str = java_lang_String::as_utf8_string(h_name());
1235
1236 // Sanity check, don't expect null
1237 if (str == nullptr) return nullptr;
1238
1239 // Internalize the string, converting '.' to '/' in string.
1240 char* p = (char*)str;
1241 while (*p != '\0') {
1242 if (*p == '.') {
1243 *p = '/';
1244 }
1245 p++;
1246 }
1247
1248 const int str_len = (int)(p - str);
1249 if (str_len > Symbol::max_length()) {
1250 // It's impossible to create this class; the name cannot fit
1251 // into the constant pool.
1252 return nullptr;
1253 }
1254 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1255
1256 // Security Note:
1257 // The Java level wrapper will perform the necessary security check allowing
1258 // us to pass the null as the initiating class loader.
1259 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1260 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1261 #if INCLUDE_CDS
1262 if (k == nullptr) {
1263 // If the class is not already loaded, try to see if it's in the shared
1264 // archive for the current classloader (h_loader).
1265 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1266 }
1267 #endif
1268 return (k == nullptr) ? nullptr :
1269 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1270 JVM_END
1271
1272 // Module support //////////////////////////////////////////////////////////////////////////////
1273
1274 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1275 jstring location, jobjectArray packages))
1276 Handle h_module (THREAD, JNIHandles::resolve(module));
1277 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1278 JVM_END
1279
1280 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1281 Handle h_module (THREAD, JNIHandles::resolve(module));
1282 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1283 JVM_END
1284
1285 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1286 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1287 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1288 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1289 JVM_END
1290
1291 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1292 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1293 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1294 JVM_END
1295
1296 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1297 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1298 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1299 JVM_END
1300
1301 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1302 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1303 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1304 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1305 JVM_END
1306
1307 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1308 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1309 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1310 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1311 JVM_END
1312
1313 // Reflection support //////////////////////////////////////////////////////////////////////////////
1314
1315 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1316 assert (cls != nullptr, "illegal class");
1317 JvmtiVMObjectAllocEventCollector oam;
1318 ResourceMark rm(THREAD);
1319 HandleMark hm(THREAD);
1320 Handle java_class(THREAD, JNIHandles::resolve(cls));
1321 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1322 return (jstring) JNIHandles::make_local(THREAD, result);
1323 JVM_END
1324
1325
1326 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1327 JvmtiVMObjectAllocEventCollector oam;
1328 oop mirror = JNIHandles::resolve_non_null(cls);
1329
1330 // Special handling for primitive objects
1331 if (java_lang_Class::is_primitive(mirror)) {
1332 // Primitive objects does not have any interfaces
1333 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1334 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1335 }
1336
1337 Klass* klass = java_lang_Class::as_Klass(mirror);
1338 // Figure size of result array
1339 int size;
1340 if (klass->is_instance_klass()) {
1341 InstanceKlass* ik = InstanceKlass::cast(klass);
1342 size = ik->local_interfaces()->length();
1343 } else {
1344 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1345 size = 2;
1346 }
1347
1348 // Allocate result array
1349 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1350 objArrayHandle result (THREAD, r);
1351 // Fill in result
1352 if (klass->is_instance_klass()) {
1353 // Regular instance klass, fill in all local interfaces
1354 for (int index = 0; index < size; index++) {
1355 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1356 result->obj_at_put(index, k->java_mirror());
1357 }
1358 } else {
1359 // All arrays implement java.lang.Cloneable and java.io.Serializable
1360 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1361 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1362 }
1363 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1364 JVM_END
1365
1366
1367 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1368 oop mirror = JNIHandles::resolve_non_null(cls);
1369 if (java_lang_Class::is_primitive(mirror)) {
1370 return JNI_FALSE;
1371 }
1372 Klass* k = java_lang_Class::as_Klass(mirror);
1373 return k->is_hidden();
1374 JVM_END
1375
1376
1377 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1378 ResourceMark rm(THREAD);
1379 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1380 JvmtiVMObjectAllocEventCollector oam;
1381
1382 // Iterate through Java frames
1383 vframeStream vfst(thread);
1384 for(; !vfst.at_end(); vfst.next()) {
1385 int loc = -1;
1386 // get method of frame
1387 Method* method = vfst.method();
1388
1389 Symbol *name = method->name();
1390
1391 InstanceKlass* holder = method->method_holder();
1392 if (name == vmSymbols::runWith_method_name()) {
1393 if (holder == vmClasses::Thread_klass()
1394 || holder == vmClasses::ScopedValue_Carrier_klass()) {
1395 loc = 1;
1396 }
1397 }
1398
1399 if (loc != -1) {
1400 javaVFrame *frame = vfst.asJavaVFrame();
1401 StackValueCollection* locals = frame->locals();
1402 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1403 Handle result = head_sv->get_obj();
1404 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1405 if (result() != nullptr) {
1406 return JNIHandles::make_local(THREAD, result());
1407 }
1408 }
1409 }
1410
1411 return nullptr;
1412 JVM_END
1413
1414 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1415 JvmtiVMObjectAllocEventCollector oam;
1416 // ofClass is a reference to a java_lang_Class object. The mirror object
1417 // of an InstanceKlass
1418 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1419 if (java_lang_Class::is_primitive(ofMirror) ||
1420 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1421 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1422 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1423 }
1424
1425 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1426 InnerClassesIterator iter(k);
1427
1428 if (iter.length() == 0) {
1429 // Neither an inner nor outer class
1430 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1431 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1432 }
1433
1434 // find inner class info
1435 constantPoolHandle cp(thread, k->constants());
1436 int length = iter.length();
1437
1438 // Allocate temp. result array
1439 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1440 objArrayHandle result (THREAD, r);
1441 int members = 0;
1442
1443 for (; !iter.done(); iter.next()) {
1444 int ioff = iter.inner_class_info_index();
1445 int ooff = iter.outer_class_info_index();
1446
1447 if (ioff != 0 && ooff != 0) {
1448 // Check to see if the name matches the class we're looking for
1449 // before attempting to find the class.
1450 if (cp->klass_name_at_matches(k, ooff)) {
1451 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1452 if (outer_klass == k) {
1453 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1454 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1455
1456 // Throws an exception if outer klass has not declared k as
1457 // an inner klass
1458 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1459
1460 result->obj_at_put(members, inner_klass->java_mirror());
1461 members++;
1462 }
1463 }
1464 }
1465 }
1466
1467 if (members != length) {
1468 // Return array of right length
1469 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1470 for(int i = 0; i < members; i++) {
1471 res->obj_at_put(i, result->obj_at(i));
1472 }
1473 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1474 }
1475
1476 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1477 JVM_END
1478
1479
1480 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1481 {
1482 // ofClass is a reference to a java_lang_Class object.
1483 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1484 if (java_lang_Class::is_primitive(ofMirror)) {
1485 return nullptr;
1486 }
1487 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1488 if (!klass->is_instance_klass()) {
1489 return nullptr;
1490 }
1491
1492 bool inner_is_member = false;
1493 Klass* outer_klass
1494 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1495 if (outer_klass == nullptr) return nullptr; // already a top-level class
1496 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1497 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1498 }
1499 JVM_END
1500
1501 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1502 {
1503 oop mirror = JNIHandles::resolve_non_null(cls);
1504 if (java_lang_Class::is_primitive(mirror)) {
1505 return nullptr;
1506 }
1507 Klass* klass = java_lang_Class::as_Klass(mirror);
1508 if (!klass->is_instance_klass()) {
1509 return nullptr;
1510 }
1511 InstanceKlass* k = InstanceKlass::cast(klass);
1512 int ooff = 0, noff = 0;
1513 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1514 if (noff != 0) {
1515 constantPoolHandle i_cp(thread, k->constants());
1516 Symbol* name = i_cp->symbol_at(noff);
1517 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1518 return (jstring) JNIHandles::make_local(THREAD, str());
1519 }
1520 }
1521 return nullptr;
1522 }
1523 JVM_END
1524
1525 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1526 assert (cls != nullptr, "illegal class");
1527 JvmtiVMObjectAllocEventCollector oam;
1528 ResourceMark rm(THREAD);
1529 oop mirror = JNIHandles::resolve_non_null(cls);
1530 // Return null for arrays and primitives
1531 if (!java_lang_Class::is_primitive(mirror)) {
1532 Klass* k = java_lang_Class::as_Klass(mirror);
1533 if (k->is_instance_klass()) {
1534 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1535 if (sym == nullptr) return nullptr;
1536 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1537 return (jstring) JNIHandles::make_local(THREAD, str());
1538 }
1539 }
1540 return nullptr;
1541 JVM_END
1542
1543
1544 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1545 assert (cls != nullptr, "illegal class");
1546 oop mirror = JNIHandles::resolve_non_null(cls);
1547 // Return null for arrays and primitives
1548 if (!java_lang_Class::is_primitive(mirror)) {
1549 Klass* k = java_lang_Class::as_Klass(mirror);
1550 if (k->is_instance_klass()) {
1551 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1552 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1553 }
1554 }
1555 return nullptr;
1556 JVM_END
1557
1558
1559 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1560 // some of this code was adapted from from jni_FromReflectedField
1561
1562 oop reflected = JNIHandles::resolve_non_null(field);
1563 oop mirror = java_lang_reflect_Field::clazz(reflected);
1564 int slot = java_lang_reflect_Field::slot(reflected);
1565 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1566
1567 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1568 int offset = ik->field_offset(slot);
1569
1570 if (modifiers & JVM_ACC_STATIC) {
1571 // for static fields we only look in the current class
1572 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1573 assert(false, "cannot find static field");
1574 return false;
1575 }
1576 } else {
1577 // for instance fields we start with the current class and work
1578 // our way up through the superclass chain
1579 if (!ik->find_field_from_offset(offset, false, &fd)) {
1580 assert(false, "cannot find instance field");
1581 return false;
1582 }
1583 }
1584 return true;
1585 }
1586
1587 static Method* jvm_get_method_common(jobject method) {
1588 // some of this code was adapted from from jni_FromReflectedMethod
1589
1590 oop reflected = JNIHandles::resolve_non_null(method);
1591 oop mirror = nullptr;
1592 int slot = 0;
1593
1594 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1595 mirror = java_lang_reflect_Constructor::clazz(reflected);
1596 slot = java_lang_reflect_Constructor::slot(reflected);
1597 } else {
1598 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1599 "wrong type");
1600 mirror = java_lang_reflect_Method::clazz(reflected);
1601 slot = java_lang_reflect_Method::slot(reflected);
1602 }
1603 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1604
1605 Method* m = ik->method_with_idnum(slot);
1606 assert(m != nullptr, "cannot find method");
1607 return m; // caller has to deal with null in product mode
1608 }
1609
1610 /* Type use annotations support (JDK 1.8) */
1611
1612 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1613 assert (cls != nullptr, "illegal class");
1614 ResourceMark rm(THREAD);
1615 // Return null for arrays and primitives
1616 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1617 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1618 if (k->is_instance_klass()) {
1619 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1620 if (type_annotations != nullptr) {
1621 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1622 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1623 }
1624 }
1625 }
1626 return nullptr;
1627 JVM_END
1628
1629 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1630 assert (method != nullptr, "illegal method");
1631 // method is a handle to a java.lang.reflect.Method object
1632 Method* m = jvm_get_method_common(method);
1633 if (m == nullptr) {
1634 return nullptr;
1635 }
1636
1637 AnnotationArray* type_annotations = m->type_annotations();
1638 if (type_annotations != nullptr) {
1639 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1640 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1641 }
1642
1643 return nullptr;
1644 JVM_END
1645
1646 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1647 assert (field != nullptr, "illegal field");
1648 fieldDescriptor fd;
1649 bool gotFd = jvm_get_field_common(field, fd);
1650 if (!gotFd) {
1651 return nullptr;
1652 }
1653
1654 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1655 JVM_END
1656
1657 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1658 if (!cp->is_within_bounds(index)) {
1659 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1660 }
1661 }
1662
1663 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1664 {
1665 // method is a handle to a java.lang.reflect.Method object
1666 Method* method_ptr = jvm_get_method_common(method);
1667 methodHandle mh (THREAD, method_ptr);
1668 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1669 const int num_params = mh->method_parameters_length();
1670
1671 if (num_params < 0) {
1672 // A -1 return value from method_parameters_length means there is no
1673 // parameter data. Return null to indicate this to the reflection
1674 // API.
1675 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1676 return (jobjectArray)nullptr;
1677 } else {
1678 // Otherwise, we return something up to reflection, even if it is
1679 // a zero-length array. Why? Because in some cases this can
1680 // trigger a MalformedParametersException.
1681
1682 // make sure all the symbols are properly formatted
1683 for (int i = 0; i < num_params; i++) {
1684 MethodParametersElement* params = mh->method_parameters_start();
1685 int index = params[i].name_cp_index;
1686 constantPoolHandle cp(THREAD, mh->constants());
1687 bounds_check(cp, index, CHECK_NULL);
1688
1689 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1690 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1691 "Wrong type at constant pool index");
1692 }
1693
1694 }
1695
1696 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1697 objArrayHandle result (THREAD, result_oop);
1698
1699 for (int i = 0; i < num_params; i++) {
1700 MethodParametersElement* params = mh->method_parameters_start();
1701 // For a 0 index, give a null symbol
1702 Symbol* sym = 0 != params[i].name_cp_index ?
1703 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1704 int flags = params[i].flags;
1705 oop param = Reflection::new_parameter(reflected_method, i, sym,
1706 flags, CHECK_NULL);
1707 result->obj_at_put(i, param);
1708 }
1709 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1710 }
1711 }
1712 JVM_END
1713
1714 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1715
1716 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1717 {
1718 JvmtiVMObjectAllocEventCollector oam;
1719
1720 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1721 // Exclude primitive types and array types
1722 if (java_lang_Class::is_primitive(ofMirror) ||
1723 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1724 // Return empty array
1725 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1726 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1727 }
1728
1729 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1730 constantPoolHandle cp(THREAD, k->constants());
1731
1732 // Ensure class is linked
1733 k->link_class(CHECK_NULL);
1734
1735 // Allocate result
1736 int num_fields;
1737
1738 if (publicOnly) {
1739 num_fields = 0;
1740 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1741 if (fs.access_flags().is_public()) ++num_fields;
1742 }
1743 } else {
1744 num_fields = k->java_fields_count();
1745 }
1746
1747 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1748 objArrayHandle result (THREAD, r);
1749
1750 int out_idx = 0;
1751 fieldDescriptor fd;
1752 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1753 if (!publicOnly || fs.access_flags().is_public()) {
1754 fd.reinitialize(k, fs.to_FieldInfo());
1755 oop field = Reflection::new_field(&fd, CHECK_NULL);
1756 result->obj_at_put(out_idx, field);
1757 ++out_idx;
1758 }
1759 }
1760 assert(out_idx == num_fields, "just checking");
1761 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1762 }
1763 JVM_END
1764
1765 // A class is a record if and only if it is final and a direct subclass of
1766 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1767 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1768 {
1769 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1770 if (k != nullptr && k->is_instance_klass()) {
1771 InstanceKlass* ik = InstanceKlass::cast(k);
1772 return ik->is_record();
1773 } else {
1774 return false;
1775 }
1776 }
1777 JVM_END
1778
1779 // Returns an array containing the components of the Record attribute,
1780 // or null if the attribute is not present.
1781 //
1782 // Note that this function returns the components of the Record attribute
1783 // even if the class is not a record.
1784 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1785 {
1786 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1787
1788 Array<RecordComponent*>* components = ik->record_components();
1789 if (components != nullptr) {
1790 JvmtiVMObjectAllocEventCollector oam;
1791 constantPoolHandle cp(THREAD, ik->constants());
1792 int length = components->length();
1793 assert(length >= 0, "unexpected record_components length");
1794 objArrayOop record_components =
1795 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1796 objArrayHandle components_h (THREAD, record_components);
1797
1798 for (int x = 0; x < length; x++) {
1799 RecordComponent* component = components->at(x);
1800 assert(component != nullptr, "unexpected null record component");
1801 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1802 components_h->obj_at_put(x, component_oop);
1803 }
1804 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1805 }
1806
1807 return nullptr;
1808 }
1809 JVM_END
1810
1811 static jobjectArray get_class_declared_methods_helper(
1812 JNIEnv *env,
1813 jclass ofClass, jboolean publicOnly,
1814 bool want_constructor,
1815 Klass* klass, TRAPS) {
1816
1817 JvmtiVMObjectAllocEventCollector oam;
1818
1819 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1820 // Exclude primitive types and array types
1821 if (java_lang_Class::is_primitive(ofMirror)
1822 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1823 // Return empty array
1824 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1825 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1826 }
1827
1828 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1829
1830 // Ensure class is linked
1831 k->link_class(CHECK_NULL);
1832
1833 Array<Method*>* methods = k->methods();
1834 int methods_length = methods->length();
1835
1836 // Save original method_idnum in case of redefinition, which can change
1837 // the idnum of obsolete methods. The new method will have the same idnum
1838 // but if we refresh the methods array, the counts will be wrong.
1839 ResourceMark rm(THREAD);
1840 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1841 int num_methods = 0;
1842
1843 // Select methods matching the criteria.
1844 for (int i = 0; i < methods_length; i++) {
1845 Method* method = methods->at(i);
1846 if (want_constructor && !method->is_object_constructor()) {
1847 continue;
1848 }
1849 if (!want_constructor &&
1850 (method->is_object_constructor() || method->is_class_initializer() ||
1851 method->is_overpass())) {
1852 continue;
1853 }
1854 if (publicOnly && !method->is_public()) {
1855 continue;
1856 }
1857 idnums->push(method->method_idnum());
1858 ++num_methods;
1859 }
1860
1861 // Allocate result
1862 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1863 objArrayHandle result (THREAD, r);
1864
1865 // Now just put the methods that we selected above, but go by their idnum
1866 // in case of redefinition. The methods can be redefined at any safepoint,
1867 // so above when allocating the oop array and below when creating reflect
1868 // objects.
1869 for (int i = 0; i < num_methods; i++) {
1870 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1871 if (method.is_null()) {
1872 // Method may have been deleted and seems this API can handle null
1873 // Otherwise should probably put a method that throws NSME
1874 result->obj_at_put(i, nullptr);
1875 } else {
1876 oop m;
1877 if (want_constructor) {
1878 assert(method->is_object_constructor(), "must be");
1879 m = Reflection::new_constructor(method, CHECK_NULL);
1880 } else {
1881 m = Reflection::new_method(method, false, CHECK_NULL);
1882 }
1883 result->obj_at_put(i, m);
1884 }
1885 }
1886
1887 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1888 }
1889
1890 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1891 {
1892 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1893 /*want_constructor*/ false,
1894 vmClasses::reflect_Method_klass(), THREAD);
1895 }
1896 JVM_END
1897
1898 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1899 {
1900 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1901 /*want_constructor*/ true,
1902 vmClasses::reflect_Constructor_klass(), THREAD);
1903 }
1904 JVM_END
1905
1906 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1907 {
1908 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1909 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1910 return c->has_nestmate_access_to(m, THREAD);
1911 }
1912 JVM_END
1913
1914 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1915 {
1916 // current is not a primitive or array class
1917 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1918 InstanceKlass* host = c->nest_host(THREAD);
1919 return (jclass) (host == nullptr ? nullptr :
1920 JNIHandles::make_local(THREAD, host->java_mirror()));
1921 }
1922 JVM_END
1923
1924 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1925 {
1926 // current is not a primitive or array class
1927 ResourceMark rm(THREAD);
1928 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1929 InstanceKlass* host = c->nest_host(THREAD);
1930
1931 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1932 c->external_name(), host->external_name());
1933 {
1934 JvmtiVMObjectAllocEventCollector oam;
1935 Array<u2>* members = host->nest_members();
1936 int length = members == nullptr ? 0 : members->length();
1937
1938 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1939
1940 // nest host is first in the array so make it one bigger
1941 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1942 length + 1, CHECK_NULL);
1943 objArrayHandle result(THREAD, r);
1944 result->obj_at_put(0, host->java_mirror());
1945 if (length != 0) {
1946 int count = 0;
1947 for (int i = 0; i < length; i++) {
1948 int cp_index = members->at(i);
1949 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1950 if (HAS_PENDING_EXCEPTION) {
1951 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1952 return nullptr; // propagate VMEs
1953 }
1954 if (log_is_enabled(Trace, class, nestmates)) {
1955 stringStream ss;
1956 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1957 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1958 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1959 log_trace(class, nestmates)("%s", ss.as_string());
1960 }
1961 CLEAR_PENDING_EXCEPTION;
1962 continue;
1963 }
1964 if (k->is_instance_klass()) {
1965 InstanceKlass* ik = InstanceKlass::cast(k);
1966 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1967 if (nest_host_k == host) {
1968 result->obj_at_put(count+1, k->java_mirror());
1969 count++;
1970 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1971 } else {
1972 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1973 ik->external_name(), nest_host_k->external_name());
1974 }
1975 } else {
1976 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1977 k->external_name());
1978 }
1979 }
1980 if (count < length) {
1981 // we had invalid entries so we need to compact the array
1982 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1983 length + 1, count + 1);
1984
1985 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1986 count + 1, CHECK_NULL);
1987 objArrayHandle result2(THREAD, r2);
1988 for (int i = 0; i < count + 1; i++) {
1989 result2->obj_at_put(i, result->obj_at(i));
1990 }
1991 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1992 }
1993 }
1994 else {
1995 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1996 }
1997 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1998 }
1999 }
2000 JVM_END
2001
2002 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2003 {
2004 oop mirror = JNIHandles::resolve_non_null(current);
2005 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2006 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2007
2008 ResourceMark rm(THREAD);
2009 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2010 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2011 if (ik->is_sealed()) {
2012 JvmtiVMObjectAllocEventCollector oam;
2013 Array<u2>* subclasses = ik->permitted_subclasses();
2014 int length = subclasses->length();
2015
2016 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2017
2018 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2019 length, CHECK_NULL);
2020 objArrayHandle result(THREAD, r);
2021 int count = 0;
2022 for (int i = 0; i < length; i++) {
2023 int cp_index = subclasses->at(i);
2024 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2025 if (HAS_PENDING_EXCEPTION) {
2026 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2027 return nullptr; // propagate VMEs
2028 }
2029 if (log_is_enabled(Trace, class, sealed)) {
2030 stringStream ss;
2031 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2032 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2033 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2034 log_trace(class, sealed)("%s", ss.as_string());
2035 }
2036
2037 CLEAR_PENDING_EXCEPTION;
2038 continue;
2039 }
2040 if (k->is_instance_klass()) {
2041 result->obj_at_put(count++, k->java_mirror());
2042 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2043 }
2044 }
2045 if (count < length) {
2046 // we had invalid entries so we need to compact the array
2047 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2048 count, CHECK_NULL);
2049 objArrayHandle result2(THREAD, r2);
2050 for (int i = 0; i < count; i++) {
2051 result2->obj_at_put(i, result->obj_at(i));
2052 }
2053 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2054 }
2055 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2056 } else {
2057 return nullptr;
2058 }
2059 }
2060 JVM_END
2061
2062 // Constant pool access //////////////////////////////////////////////////////////
2063
2064 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2065 {
2066 JvmtiVMObjectAllocEventCollector oam;
2067 oop mirror = JNIHandles::resolve_non_null(cls);
2068 // Return null for primitives and arrays
2069 if (!java_lang_Class::is_primitive(mirror)) {
2070 Klass* k = java_lang_Class::as_Klass(mirror);
2071 if (k->is_instance_klass()) {
2072 InstanceKlass* k_h = InstanceKlass::cast(k);
2073 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2074 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2075 return JNIHandles::make_local(THREAD, jcp());
2076 }
2077 }
2078 return nullptr;
2079 }
2080 JVM_END
2081
2082
2083 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2084 {
2085 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2086 return cp->length();
2087 }
2088 JVM_END
2089
2090
2091 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2092 {
2093 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2094 bounds_check(cp, index, CHECK_NULL);
2095 constantTag tag = cp->tag_at(index);
2096 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2097 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2098 }
2099 Klass* k = cp->klass_at(index, CHECK_NULL);
2100 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2101 }
2102 JVM_END
2103
2104 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2105 {
2106 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2107 bounds_check(cp, index, CHECK_NULL);
2108 constantTag tag = cp->tag_at(index);
2109 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2110 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2111 }
2112 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2113 if (k == nullptr) return nullptr;
2114 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2115 }
2116 JVM_END
2117
2118 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2119 constantTag tag = cp->tag_at(index);
2120 if (!tag.is_method() && !tag.is_interface_method()) {
2121 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2122 }
2123 int klass_ref = cp->uncached_klass_ref_index_at(index);
2124 Klass* k_o;
2125 if (force_resolution) {
2126 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2127 } else {
2128 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2129 if (k_o == nullptr) return nullptr;
2130 }
2131 InstanceKlass* k = InstanceKlass::cast(k_o);
2132 Symbol* name = cp->uncached_name_ref_at(index);
2133 Symbol* sig = cp->uncached_signature_ref_at(index);
2134 methodHandle m (THREAD, k->find_method(name, sig));
2135 if (m.is_null()) {
2136 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2137 }
2138 oop method;
2139 if (m->is_object_constructor()) {
2140 method = Reflection::new_constructor(m, CHECK_NULL);
2141 } else {
2142 method = Reflection::new_method(m, true, CHECK_NULL);
2143 }
2144 return JNIHandles::make_local(THREAD, method);
2145 }
2146
2147 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2148 {
2149 JvmtiVMObjectAllocEventCollector oam;
2150 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2151 bounds_check(cp, index, CHECK_NULL);
2152 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2153 return res;
2154 }
2155 JVM_END
2156
2157 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2158 {
2159 JvmtiVMObjectAllocEventCollector oam;
2160 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2161 bounds_check(cp, index, CHECK_NULL);
2162 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2163 return res;
2164 }
2165 JVM_END
2166
2167 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2168 constantTag tag = cp->tag_at(index);
2169 if (!tag.is_field()) {
2170 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2171 }
2172 int klass_ref = cp->uncached_klass_ref_index_at(index);
2173 Klass* k_o;
2174 if (force_resolution) {
2175 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2176 } else {
2177 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2178 if (k_o == nullptr) return nullptr;
2179 }
2180 InstanceKlass* k = InstanceKlass::cast(k_o);
2181 Symbol* name = cp->uncached_name_ref_at(index);
2182 Symbol* sig = cp->uncached_signature_ref_at(index);
2183 fieldDescriptor fd;
2184 Klass* target_klass = k->find_field(name, sig, &fd);
2185 if (target_klass == nullptr) {
2186 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2187 }
2188 oop field = Reflection::new_field(&fd, CHECK_NULL);
2189 return JNIHandles::make_local(THREAD, field);
2190 }
2191
2192 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2193 {
2194 JvmtiVMObjectAllocEventCollector oam;
2195 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2196 bounds_check(cp, index, CHECK_NULL);
2197 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2198 return res;
2199 }
2200 JVM_END
2201
2202 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2203 {
2204 JvmtiVMObjectAllocEventCollector oam;
2205 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2206 bounds_check(cp, index, CHECK_NULL);
2207 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2208 return res;
2209 }
2210 JVM_END
2211
2212 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2213 {
2214 JvmtiVMObjectAllocEventCollector oam;
2215 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2216 bounds_check(cp, index, CHECK_NULL);
2217 constantTag tag = cp->tag_at(index);
2218 if (!tag.is_field_or_method()) {
2219 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2220 }
2221 int klass_ref = cp->uncached_klass_ref_index_at(index);
2222 Symbol* klass_name = cp->klass_name_at(klass_ref);
2223 Symbol* member_name = cp->uncached_name_ref_at(index);
2224 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2225 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2226 objArrayHandle dest(THREAD, dest_o);
2227 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2228 dest->obj_at_put(0, str());
2229 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2230 dest->obj_at_put(1, str());
2231 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2232 dest->obj_at_put(2, str());
2233 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2234 }
2235 JVM_END
2236
2237 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2238 {
2239 JvmtiVMObjectAllocEventCollector oam;
2240 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2241 bounds_check(cp, index, CHECK_0);
2242 constantTag tag = cp->tag_at(index);
2243 if (!tag.is_field_or_method()) {
2244 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2245 }
2246 return (jint) cp->uncached_klass_ref_index_at(index);
2247 }
2248 JVM_END
2249
2250 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2251 {
2252 JvmtiVMObjectAllocEventCollector oam;
2253 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2254 bounds_check(cp, index, CHECK_0);
2255 constantTag tag = cp->tag_at(index);
2256 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2257 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2258 }
2259 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2260 }
2261 JVM_END
2262
2263 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2264 {
2265 JvmtiVMObjectAllocEventCollector oam;
2266 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2267 bounds_check(cp, index, CHECK_NULL);
2268 constantTag tag = cp->tag_at(index);
2269 if (!tag.is_name_and_type()) {
2270 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2271 }
2272 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2273 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2274 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2275 objArrayHandle dest(THREAD, dest_o);
2276 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2277 dest->obj_at_put(0, str());
2278 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2279 dest->obj_at_put(1, str());
2280 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2281 }
2282 JVM_END
2283
2284 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2285 {
2286 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2287 bounds_check(cp, index, CHECK_0);
2288 constantTag tag = cp->tag_at(index);
2289 if (!tag.is_int()) {
2290 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2291 }
2292 return cp->int_at(index);
2293 }
2294 JVM_END
2295
2296 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2297 {
2298 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2299 bounds_check(cp, index, CHECK_(0L));
2300 constantTag tag = cp->tag_at(index);
2301 if (!tag.is_long()) {
2302 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2303 }
2304 return cp->long_at(index);
2305 }
2306 JVM_END
2307
2308 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2309 {
2310 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2311 bounds_check(cp, index, CHECK_(0.0f));
2312 constantTag tag = cp->tag_at(index);
2313 if (!tag.is_float()) {
2314 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2315 }
2316 return cp->float_at(index);
2317 }
2318 JVM_END
2319
2320 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2321 {
2322 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2323 bounds_check(cp, index, CHECK_(0.0));
2324 constantTag tag = cp->tag_at(index);
2325 if (!tag.is_double()) {
2326 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2327 }
2328 return cp->double_at(index);
2329 }
2330 JVM_END
2331
2332 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2333 {
2334 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2335 bounds_check(cp, index, CHECK_NULL);
2336 constantTag tag = cp->tag_at(index);
2337 if (!tag.is_string()) {
2338 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2339 }
2340 oop str = cp->string_at(index, CHECK_NULL);
2341 return (jstring) JNIHandles::make_local(THREAD, str);
2342 }
2343 JVM_END
2344
2345 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2346 {
2347 JvmtiVMObjectAllocEventCollector oam;
2348 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2349 bounds_check(cp, index, CHECK_NULL);
2350 constantTag tag = cp->tag_at(index);
2351 if (!tag.is_symbol()) {
2352 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2353 }
2354 Symbol* sym = cp->symbol_at(index);
2355 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2356 return (jstring) JNIHandles::make_local(THREAD, str());
2357 }
2358 JVM_END
2359
2360 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2361 {
2362 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2363 bounds_check(cp, index, CHECK_0);
2364 constantTag tag = cp->tag_at(index);
2365 jbyte result = tag.value();
2366 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2367 // they are changed to the corresponding tags from the JVM spec, so that java code in
2368 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2369 if (tag.is_klass_or_reference()) {
2370 result = JVM_CONSTANT_Class;
2371 } else if (tag.is_string_index()) {
2372 result = JVM_CONSTANT_String;
2373 } else if (tag.is_method_type_in_error()) {
2374 result = JVM_CONSTANT_MethodType;
2375 } else if (tag.is_method_handle_in_error()) {
2376 result = JVM_CONSTANT_MethodHandle;
2377 } else if (tag.is_dynamic_constant_in_error()) {
2378 result = JVM_CONSTANT_Dynamic;
2379 }
2380 return result;
2381 }
2382 JVM_END
2383
2384 // Assertion support. //////////////////////////////////////////////////////////
2385
2386 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2387 assert(cls != nullptr, "bad class");
2388
2389 oop r = JNIHandles::resolve(cls);
2390 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2391 if (java_lang_Class::is_primitive(r)) return false;
2392
2393 Klass* k = java_lang_Class::as_Klass(r);
2394 assert(k->is_instance_klass(), "must be an instance klass");
2395 if (!k->is_instance_klass()) return false;
2396
2397 ResourceMark rm(THREAD);
2398 const char* name = k->name()->as_C_string();
2399 bool system_class = k->class_loader() == nullptr;
2400 return JavaAssertions::enabled(name, system_class);
2401
2402 JVM_END
2403
2404
2405 // Return a new AssertionStatusDirectives object with the fields filled in with
2406 // command-line assertion arguments (i.e., -ea, -da).
2407 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2408 JvmtiVMObjectAllocEventCollector oam;
2409 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2410 return JNIHandles::make_local(THREAD, asd);
2411 JVM_END
2412
2413 // Verification ////////////////////////////////////////////////////////////////////////////////
2414
2415 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2416
2417 // RedefineClasses support: bug 6214132 caused verification to fail.
2418 // All functions from this section, unless noted otherwise, should call the functions
2419 // get_klass_considering_redefinition(), or
2420 // get_instance_klass_considering_redefinition()
2421 // These functions return JvmtiThreadState::_scratch_class if the verifier
2422 // was invoked in the middle of the redefinition of cls.
2423 // See jvmtiThreadState.hpp for details.
2424
2425 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2426 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2427 if (k->is_instance_klass()) {
2428 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2429 } else {
2430 return k;
2431 }
2432 }
2433
2434 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2435 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2436 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2437 }
2438
2439 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2440 oop mirror = JNIHandles::resolve_non_null(cls);
2441 if (java_lang_Class::is_primitive(mirror)) {
2442 return JNI_FALSE;
2443 }
2444 Klass* k = java_lang_Class::as_Klass(mirror);
2445 // This isn't necessary since answer is the same because redefinition
2446 // has already checked this matches for the scratch class.
2447 // k = get_klass_considering_redefinition(cls, thread)
2448 jboolean result = k->is_interface();
2449 assert(!result || k->is_instance_klass(),
2450 "all interfaces are instance types");
2451 return result;
2452 JVM_END
2453
2454 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2455 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2457 return k->name()->as_utf8();
2458 JVM_END
2459
2460
2461 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2462 Klass* k = get_klass_considering_redefinition(cls, thread);
2463 // types will have length zero if this is not an InstanceKlass
2464 // (length is determined by call to JVM_GetClassCPEntriesCount)
2465 if (k->is_instance_klass()) {
2466 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2467 for (int index = cp->length() - 1; index >= 0; index--) {
2468 constantTag tag = cp->tag_at(index);
2469 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2470 }
2471 }
2472 JVM_END
2473
2474
2475 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2476 Klass* k = get_klass_considering_redefinition(cls, thread);
2477 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2478 JVM_END
2479
2480
2481 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2482 Klass* k = get_klass_considering_redefinition(cls, thread);
2483 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2484 JVM_END
2485
2486
2487 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2488 Klass* k = get_klass_considering_redefinition(cls, thread);
2489 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2490 JVM_END
2491
2492
2493 // The following methods, used for the verifier, are never called with
2494 // array klasses, so a direct cast to InstanceKlass is safe.
2495 // Typically, these methods are called in a loop with bounds determined
2496 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2497 // zero for arrays.
2498 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2499 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2500 Method* method = ik->methods()->at(method_index);
2501 int length = method->checked_exceptions_length();
2502 if (length > 0) {
2503 CheckedExceptionElement* table= method->checked_exceptions_start();
2504 for (int i = 0; i < length; i++) {
2505 exceptions[i] = table[i].class_cp_index;
2506 }
2507 }
2508 JVM_END
2509
2510
2511 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2512 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2513 Method* method = ik->methods()->at(method_index);
2514 return method->checked_exceptions_length();
2515 JVM_END
2516
2517
2518 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2519 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2520 Method* method = ik->methods()->at(method_index);
2521 memcpy(code, method->code_base(), method->code_size());
2522 JVM_END
2523
2524
2525 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2526 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2527 Method* method = ik->methods()->at(method_index);
2528 return method->code_size();
2529 JVM_END
2530
2531
2532 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2533 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2534 Method* method = ik->methods()->at(method_index);
2535 ExceptionTable extable(method);
2536 entry->start_pc = extable.start_pc(entry_index);
2537 entry->end_pc = extable.end_pc(entry_index);
2538 entry->handler_pc = extable.handler_pc(entry_index);
2539 entry->catchType = extable.catch_type_index(entry_index);
2540 JVM_END
2541
2542
2543 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2544 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2545 Method* method = ik->methods()->at(method_index);
2546 return method->exception_table_length();
2547 JVM_END
2548
2549
2550 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2551 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2552 Method* method = ik->methods()->at(method_index);
2553 return method->access_flags().as_method_flags();
2554 JVM_END
2555
2556
2557 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2558 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2559 return ik->field_access_flags(field_index);
2560 JVM_END
2561
2562
2563 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2564 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2565 Method* method = ik->methods()->at(method_index);
2566 return method->max_locals();
2567 JVM_END
2568
2569
2570 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2571 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2572 Method* method = ik->methods()->at(method_index);
2573 return method->size_of_parameters();
2574 JVM_END
2575
2576
2577 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2578 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2579 Method* method = ik->methods()->at(method_index);
2580 return method->verifier_max_stack();
2581 JVM_END
2582
2583
2584 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2585 ResourceMark rm(THREAD);
2586 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2587 Method* method = ik->methods()->at(method_index);
2588 return method->is_object_constructor();
2589 JVM_END
2590
2591
2592 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2593 ResourceMark rm(THREAD);
2594 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2595 Method* method = ik->methods()->at(method_index);
2596 return method->is_overpass();
2597 JVM_END
2598
2599 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2600 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2601 Method* method = ik->methods()->at(method_index);
2602 return method->name()->as_utf8();
2603 JVM_END
2604
2605
2606 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2607 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2608 Method* method = ik->methods()->at(method_index);
2609 return method->signature()->as_utf8();
2610 JVM_END
2611
2612 /**
2613 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2614 * read entries in the constant pool. Since the old verifier always
2615 * works on a copy of the code, it will not see any rewriting that
2616 * may possibly occur in the middle of verification. So it is important
2617 * that nothing it calls tries to use the cpCache instead of the raw
2618 * constant pool, so we must use cp->uncached_x methods when appropriate.
2619 */
2620 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2621 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2622 ConstantPool* cp = ik->constants();
2623 switch (cp->tag_at(cp_index).value()) {
2624 case JVM_CONSTANT_Fieldref:
2625 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2626 default:
2627 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2628 }
2629 ShouldNotReachHere();
2630 return nullptr;
2631 JVM_END
2632
2633
2634 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2635 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2636 ConstantPool* cp = ik->constants();
2637 switch (cp->tag_at(cp_index).value()) {
2638 case JVM_CONSTANT_InterfaceMethodref:
2639 case JVM_CONSTANT_Methodref:
2640 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2641 default:
2642 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2643 }
2644 ShouldNotReachHere();
2645 return nullptr;
2646 JVM_END
2647
2648
2649 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2650 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2651 ConstantPool* cp = ik->constants();
2652 switch (cp->tag_at(cp_index).value()) {
2653 case JVM_CONSTANT_InterfaceMethodref:
2654 case JVM_CONSTANT_Methodref:
2655 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2656 default:
2657 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2658 }
2659 ShouldNotReachHere();
2660 return nullptr;
2661 JVM_END
2662
2663
2664 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2665 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2666 ConstantPool* cp = ik->constants();
2667 switch (cp->tag_at(cp_index).value()) {
2668 case JVM_CONSTANT_Fieldref:
2669 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2670 default:
2671 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2672 }
2673 ShouldNotReachHere();
2674 return nullptr;
2675 JVM_END
2676
2677
2678 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2679 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2680 ConstantPool* cp = ik->constants();
2681 Symbol* classname = cp->klass_name_at(cp_index);
2682 return classname->as_utf8();
2683 JVM_END
2684
2685
2686 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(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 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2692 Symbol* classname = cp->klass_name_at(class_index);
2693 return classname->as_utf8();
2694 }
2695 default:
2696 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2697 }
2698 ShouldNotReachHere();
2699 return nullptr;
2700 JVM_END
2701
2702
2703 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2704 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2705 ConstantPool* cp = ik->constants();
2706 switch (cp->tag_at(cp_index).value()) {
2707 case JVM_CONSTANT_Methodref:
2708 case JVM_CONSTANT_InterfaceMethodref: {
2709 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2710 Symbol* classname = cp->klass_name_at(class_index);
2711 return classname->as_utf8();
2712 }
2713 default:
2714 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2715 }
2716 ShouldNotReachHere();
2717 return nullptr;
2718 JVM_END
2719
2720
2721 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2722 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2723 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2724 ConstantPool* cp = ik->constants();
2725 ConstantPool* cp_called = ik_called->constants();
2726 switch (cp->tag_at(cp_index).value()) {
2727 case JVM_CONSTANT_Fieldref: {
2728 Symbol* name = cp->uncached_name_ref_at(cp_index);
2729 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2730 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2731 if (fs.name() == name && fs.signature() == signature) {
2732 return fs.access_flags().as_field_flags();
2733 }
2734 }
2735 return -1;
2736 }
2737 default:
2738 fatal("JVM_GetCPFieldModifiers: illegal constant");
2739 }
2740 ShouldNotReachHere();
2741 return 0;
2742 JVM_END
2743
2744
2745 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2746 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2747 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2748 ConstantPool* cp = ik->constants();
2749 switch (cp->tag_at(cp_index).value()) {
2750 case JVM_CONSTANT_Methodref:
2751 case JVM_CONSTANT_InterfaceMethodref: {
2752 Symbol* name = cp->uncached_name_ref_at(cp_index);
2753 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2754 Array<Method*>* methods = ik_called->methods();
2755 int methods_count = methods->length();
2756 for (int i = 0; i < methods_count; i++) {
2757 Method* method = methods->at(i);
2758 if (method->name() == name && method->signature() == signature) {
2759 return method->access_flags().as_method_flags();
2760 }
2761 }
2762 return -1;
2763 }
2764 default:
2765 fatal("JVM_GetCPMethodModifiers: illegal constant");
2766 }
2767 ShouldNotReachHere();
2768 return 0;
2769 JVM_END
2770
2771
2772 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2773
2774 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2775 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2776 JVM_END
2777
2778
2779 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2780 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2781 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2782 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2783 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2784 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2785 JVM_END
2786
2787 // Printing support //////////////////////////////////////////////////
2788 extern "C" {
2789
2790 ATTRIBUTE_PRINTF(3, 0)
2791 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2792 // Reject count values that are negative signed values converted to
2793 // unsigned; see bug 4399518, 4417214
2794 if ((intptr_t)count <= 0) return -1;
2795
2796 int result = os::vsnprintf(str, count, fmt, args);
2797 if (result > 0 && (size_t)result >= count) {
2798 result = -1;
2799 }
2800
2801 return result;
2802 }
2803
2804 ATTRIBUTE_PRINTF(3, 4)
2805 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2806 va_list args;
2807 int len;
2808 va_start(args, fmt);
2809 len = jio_vsnprintf(str, count, fmt, args);
2810 va_end(args);
2811 return len;
2812 }
2813
2814 ATTRIBUTE_PRINTF(2, 3)
2815 int jio_fprintf(FILE* f, const char *fmt, ...) {
2816 int len;
2817 va_list args;
2818 va_start(args, fmt);
2819 len = jio_vfprintf(f, fmt, args);
2820 va_end(args);
2821 return len;
2822 }
2823
2824 ATTRIBUTE_PRINTF(2, 0)
2825 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2826 if (Arguments::vfprintf_hook() != nullptr) {
2827 return Arguments::vfprintf_hook()(f, fmt, args);
2828 } else {
2829 return vfprintf(f, fmt, args);
2830 }
2831 }
2832
2833 ATTRIBUTE_PRINTF(1, 2)
2834 JNIEXPORT int jio_printf(const char *fmt, ...) {
2835 int len;
2836 va_list args;
2837 va_start(args, fmt);
2838 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2839 va_end(args);
2840 return len;
2841 }
2842
2843 // HotSpot specific jio method
2844 void jio_print(const char* s, size_t len) {
2845 // Try to make this function as atomic as possible.
2846 if (Arguments::vfprintf_hook() != nullptr) {
2847 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2848 } else {
2849 // Make an unused local variable to avoid warning from gcc compiler.
2850 bool dummy = os::write(defaultStream::output_fd(), s, len);
2851 }
2852 }
2853
2854 } // Extern C
2855
2856 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2857
2858 // In most of the JVM thread support functions we need to access the
2859 // thread through a ThreadsListHandle to prevent it from exiting and
2860 // being reclaimed while we try to operate on it. The exceptions to this
2861 // rule are when operating on the current thread, or if the monitor of
2862 // the target java.lang.Thread is locked at the Java level - in both
2863 // cases the target cannot exit.
2864
2865 static void thread_entry(JavaThread* thread, TRAPS) {
2866 HandleMark hm(THREAD);
2867 Handle obj(THREAD, thread->threadObj());
2868 JavaValue result(T_VOID);
2869 JavaCalls::call_virtual(&result,
2870 obj,
2871 vmClasses::Thread_klass(),
2872 vmSymbols::run_method_name(),
2873 vmSymbols::void_method_signature(),
2874 THREAD);
2875 }
2876
2877
2878 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2879 #if INCLUDE_CDS
2880 if (CDSConfig::allow_only_single_java_thread()) {
2881 // During java -Xshare:dump, if we allow multiple Java threads to
2882 // execute in parallel, symbols and classes may be loaded in
2883 // random orders which will make the resulting CDS archive
2884 // non-deterministic.
2885 //
2886 // Lucikly, during java -Xshare:dump, it's important to run only
2887 // the code in the main Java thread (which is NOT started here) that
2888 // creates the module graph, etc. It's safe to not start the other
2889 // threads which are launched by class static initializers
2890 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2891 if (log_is_enabled(Info, aot)) {
2892 ResourceMark rm;
2893 oop t = JNIHandles::resolve_non_null(jthread);
2894 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2895 }
2896 return;
2897 }
2898 #endif
2899 JavaThread *native_thread = nullptr;
2900
2901 // We cannot hold the Threads_lock when we throw an exception,
2902 // due to rank ordering issues. Example: we might need to grab the
2903 // Heap_lock while we construct the exception.
2904 bool throw_illegal_thread_state = false;
2905
2906 // We must release the Threads_lock before we can post a jvmti event
2907 // in Thread::start.
2908 {
2909 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2910 // Ensure that the C++ Thread and OSThread structures aren't freed before
2911 // we operate.
2912 MutexLocker ml(Threads_lock);
2913
2914 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2915 // re-starting an already started thread, so we should usually find
2916 // that the JavaThread is null. However for a JNI attached thread
2917 // there is a small window between the Thread object being created
2918 // (with its JavaThread set) and the update to its threadStatus, so we
2919 // have to check for this
2920 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2921 throw_illegal_thread_state = true;
2922 } else {
2923 jlong size =
2924 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2925 // Allocate the C++ Thread structure and create the native thread. The
2926 // stack size retrieved from java is 64-bit signed, but the constructor takes
2927 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2928 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2929 // - Avoid passing negative values which would result in really large stacks.
2930 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2931 size_t sz = size > 0 ? (size_t) size : 0;
2932 native_thread = new JavaThread(&thread_entry, sz);
2933
2934 // At this point it may be possible that no osthread was created for the
2935 // JavaThread due to lack of memory. Check for this situation and throw
2936 // an exception if necessary. Eventually we may want to change this so
2937 // that we only grab the lock if the thread was created successfully -
2938 // then we can also do this check and throw the exception in the
2939 // JavaThread constructor.
2940 if (native_thread->osthread() != nullptr) {
2941 // Note: the current thread is not being used within "prepare".
2942 native_thread->prepare(jthread);
2943 }
2944 }
2945 }
2946
2947 if (throw_illegal_thread_state) {
2948 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2949 }
2950
2951 assert(native_thread != nullptr, "Starting null thread?");
2952
2953 if (native_thread->osthread() == nullptr) {
2954 ResourceMark rm(thread);
2955 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2956 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2957 // No one should hold a reference to the 'native_thread'.
2958 native_thread->smr_delete();
2959 if (JvmtiExport::should_post_resource_exhausted()) {
2960 JvmtiExport::post_resource_exhausted(
2961 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2962 os::native_thread_creation_failed_msg());
2963 }
2964 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2965 os::native_thread_creation_failed_msg());
2966 }
2967
2968 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2969
2970 Thread::start(native_thread);
2971
2972 JVM_END
2973
2974
2975 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2976 ThreadsListHandle tlh(thread);
2977 oop java_thread = nullptr;
2978 JavaThread* receiver = nullptr;
2979 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2980 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2981
2982 if (is_alive) {
2983 // jthread refers to a live JavaThread.
2984 Thread::set_priority(receiver, (ThreadPriority)prio);
2985 }
2986 // Implied else: If the JavaThread hasn't started yet, then the
2987 // priority set in the java.lang.Thread object above will be pushed
2988 // down when it does start.
2989 JVM_END
2990
2991
2992 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2993 HOTSPOT_THREAD_YIELD();
2994 os::naked_yield();
2995 JVM_END
2996
2997 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2998 if (nanos < 0) {
2999 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3000 }
3001
3002 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3003 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3004 }
3005
3006 // Save current thread state and restore it at the end of this block.
3007 // And set new thread state to SLEEPING.
3008 JavaThreadSleepState jtss(thread);
3009
3010 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3011
3012 if (nanos == 0) {
3013 os::naked_yield();
3014 } else {
3015 ThreadState old_state = thread->osthread()->get_state();
3016 thread->osthread()->set_state(SLEEPING);
3017 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3018 // An asynchronous exception could have been thrown on
3019 // us while we were sleeping. We do not overwrite those.
3020 if (!HAS_PENDING_EXCEPTION) {
3021 HOTSPOT_THREAD_SLEEP_END(1);
3022 if (!thread->has_async_exception_condition()) {
3023 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3024 // to properly restore the thread state. That's likely wrong.
3025 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3026 }
3027 }
3028 }
3029 thread->osthread()->set_state(old_state);
3030 }
3031 HOTSPOT_THREAD_SLEEP_END(0);
3032 JVM_END
3033
3034 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3035 oop jthread = thread->threadObj();
3036 assert(jthread != nullptr, "no current carrier thread!");
3037 return JNIHandles::make_local(THREAD, jthread);
3038 JVM_END
3039
3040 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3041 oop theThread = thread->vthread();
3042 assert(theThread != (oop)nullptr, "no current thread!");
3043 return JNIHandles::make_local(THREAD, theThread);
3044 JVM_END
3045
3046 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3047 jobject theThread))
3048 oop threadObj = JNIHandles::resolve(theThread);
3049 thread->set_vthread(threadObj);
3050
3051 // Set _monitor_owner_id of new current Thread
3052 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3053
3054 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3055 JVM_END
3056
3057 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3058 return ThreadIdentifier::unsafe_offset();
3059 JVM_END
3060
3061 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3062 ThreadsListHandle tlh(thread);
3063 JavaThread* receiver = nullptr;
3064 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3065 if (is_alive) {
3066 // jthread refers to a live JavaThread.
3067 receiver->interrupt();
3068 }
3069 JVM_END
3070
3071 // Return true iff the current thread has locked the object passed in
3072
3073 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3074 if (obj == nullptr) {
3075 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3076 }
3077 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3078 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3079 JVM_END
3080
3081 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3082 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3083 return JNIHandles::make_local(THREAD, trace);
3084 JVM_END
3085
3086 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3087 #if INCLUDE_JVMTI
3088 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3089 return JNIHandles::make_local(THREAD, snapshot);
3090 #else
3091 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3092 #endif
3093 JVM_END
3094
3095 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3096 // We don't use a ThreadsListHandle here because the current thread
3097 // must be alive.
3098 oop java_thread = JNIHandles::resolve_non_null(jthread);
3099 JavaThread* thr = java_lang_Thread::thread(java_thread);
3100 if (thread == thr && !thr->has_attached_via_jni()) {
3101 // Thread naming is only supported for the current thread and
3102 // we don't set the name of an attached thread to avoid stepping
3103 // on other programs.
3104 ResourceMark rm(thread);
3105 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3106 os::set_native_thread_name(thread_name);
3107 }
3108 JVM_END
3109
3110 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3111 oop theCache = thread->scopedValueCache();
3112 return JNIHandles::make_local(THREAD, theCache);
3113 JVM_END
3114
3115 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3116 jobject theCache))
3117 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3118 thread->set_scopedValueCache(objs);
3119 JVM_END
3120
3121
3122 // java.lang.Package ////////////////////////////////////////////////////////////////
3123
3124
3125 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3126 ResourceMark rm(THREAD);
3127 JvmtiVMObjectAllocEventCollector oam;
3128 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3129 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3130 return (jstring) JNIHandles::make_local(THREAD, result);
3131 JVM_END
3132
3133
3134 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3135 JvmtiVMObjectAllocEventCollector oam;
3136 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3137 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3138 JVM_END
3139
3140
3141 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3142
3143
3144 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3145 MonitorLocker ml(Heap_lock);
3146 oop ref = Universe::reference_pending_list();
3147 if (ref != nullptr) {
3148 Universe::clear_reference_pending_list();
3149 }
3150 return JNIHandles::make_local(THREAD, ref);
3151 JVM_END
3152
3153 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3154 MonitorLocker ml(Heap_lock);
3155 return Universe::has_reference_pending_list();
3156 JVM_END
3157
3158 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3159 MonitorLocker ml(Heap_lock);
3160 while (!Universe::has_reference_pending_list()) {
3161 ml.wait();
3162 }
3163 JVM_END
3164
3165 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3166 oop ref_oop = JNIHandles::resolve_non_null(ref);
3167 // PhantomReference has its own implementation of get().
3168 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3169 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3170 return JNIHandles::make_local(THREAD, referent);
3171 JVM_END
3172
3173 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3174 oop ref_oop = JNIHandles::resolve_non_null(ref);
3175 // PhantomReference has its own implementation of refersTo().
3176 // See: JVM_PhantomReferenceRefersTo
3177 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3178 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3179 return referent == JNIHandles::resolve(o);
3180 JVM_END
3181
3182 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3183 oop ref_oop = JNIHandles::resolve_non_null(ref);
3184 // FinalReference has it's own implementation of clear().
3185 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3186 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3187 // If the referent has already been cleared then done.
3188 // However, if the referent is dead but has not yet been cleared by
3189 // concurrent reference processing, it should NOT be cleared here.
3190 // Instead, clearing should be left to the GC. Clearing it here could
3191 // detectably lose an expected notification, which is impossible with
3192 // STW reference processing. The clearing in enqueue() doesn't have
3193 // this problem, since the enqueue covers the notification, but it's not
3194 // worth the effort to handle that case specially.
3195 return;
3196 }
3197 java_lang_ref_Reference::clear_referent(ref_oop);
3198 JVM_END
3199
3200
3201 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3202
3203
3204 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3205 oop ref_oop = JNIHandles::resolve_non_null(ref);
3206 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3207 return referent == JNIHandles::resolve(o);
3208 JVM_END
3209
3210
3211 // ObjectInputStream ///////////////////////////////////////////////////////////////
3212
3213 // Return the first user-defined class loader up the execution stack, or null
3214 // if only code from the bootstrap or platform class loader is on the stack.
3215
3216 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3217 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3218 InstanceKlass* ik = vfst.method()->method_holder();
3219 oop loader = ik->class_loader();
3220 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3221 return JNIHandles::make_local(THREAD, loader);
3222 }
3223 }
3224 return nullptr;
3225 JVM_END
3226
3227
3228 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3229
3230
3231 // resolve array handle and check arguments
3232 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3233 if (arr == nullptr) {
3234 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3235 }
3236 oop a = JNIHandles::resolve_non_null(arr);
3237 if (!a->is_array()) {
3238 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3239 } else if (type_array_only && !a->is_typeArray()) {
3240 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3241 }
3242 return arrayOop(a);
3243 }
3244
3245
3246 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3247 arrayOop a = check_array(env, arr, false, CHECK_0);
3248 return a->length();
3249 JVM_END
3250
3251
3252 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3253 JvmtiVMObjectAllocEventCollector oam;
3254 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3255 jvalue value;
3256 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3257 oop box = Reflection::box(&value, type, CHECK_NULL);
3258 return JNIHandles::make_local(THREAD, box);
3259 JVM_END
3260
3261
3262 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3263 jvalue value;
3264 value.i = 0; // to initialize value before getting used in CHECK
3265 arrayOop a = check_array(env, arr, true, CHECK_(value));
3266 assert(a->is_typeArray(), "just checking");
3267 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3268 BasicType wide_type = (BasicType) wCode;
3269 if (type != wide_type) {
3270 Reflection::widen(&value, type, wide_type, CHECK_(value));
3271 }
3272 return value;
3273 JVM_END
3274
3275
3276 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3277 arrayOop a = check_array(env, arr, false, CHECK);
3278 oop box = JNIHandles::resolve(val);
3279 jvalue value;
3280 value.i = 0; // to initialize value before getting used in CHECK
3281 BasicType value_type;
3282 if (a->is_objArray()) {
3283 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3284 value_type = Reflection::unbox_for_regular_object(box, &value);
3285 } else {
3286 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3287 }
3288 Reflection::array_set(&value, a, index, value_type, CHECK);
3289 JVM_END
3290
3291
3292 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3293 arrayOop a = check_array(env, arr, true, CHECK);
3294 assert(a->is_typeArray(), "just checking");
3295 BasicType value_type = (BasicType) vCode;
3296 Reflection::array_set(&v, a, index, value_type, CHECK);
3297 JVM_END
3298
3299
3300 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3301 JvmtiVMObjectAllocEventCollector oam;
3302 oop element_mirror = JNIHandles::resolve(eltClass);
3303 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3304 return JNIHandles::make_local(THREAD, result);
3305 JVM_END
3306
3307
3308 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3309 JvmtiVMObjectAllocEventCollector oam;
3310 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3311 oop element_mirror = JNIHandles::resolve(eltClass);
3312 assert(dim_array->is_typeArray(), "just checking");
3313 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3314 return JNIHandles::make_local(THREAD, result);
3315 JVM_END
3316
3317
3318 // Library support ///////////////////////////////////////////////////////////////////////////
3319
3320 JVM_LEAF(void*, JVM_LoadZipLibrary())
3321 return ZipLibrary::handle();
3322 JVM_END
3323
3324 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3325 //%note jvm_ct
3326 char ebuf[1024];
3327 void *load_result;
3328 {
3329 ThreadToNativeFromVM ttnfvm(thread);
3330 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3331 }
3332 if (load_result == nullptr) {
3333 if (throwException) {
3334 char msg[1024];
3335 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3336 // Since 'ebuf' may contain a string encoded using
3337 // platform encoding scheme, we need to pass
3338 // Exceptions::unsafe_to_utf8 to the new_exception method
3339 // as the last argument. See bug 6367357.
3340 Handle h_exception =
3341 Exceptions::new_exception(thread,
3342 vmSymbols::java_lang_UnsatisfiedLinkError(),
3343 msg, Exceptions::unsafe_to_utf8);
3344
3345 THROW_HANDLE_NULL(h_exception);
3346 } else {
3347 log_info(library)("Failed to load library %s", name);
3348 return load_result;
3349 }
3350 }
3351 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3352 return load_result;
3353 JVM_END
3354
3355
3356 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3357 os::dll_unload(handle);
3358 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3359 JVM_END
3360
3361
3362 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3363 void* find_result = os::dll_lookup(handle, name);
3364 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3365 find_result != nullptr ? "Found" : "Failed to find",
3366 name, p2i(handle));
3367 return find_result;
3368 JVM_END
3369
3370
3371 // JNI version ///////////////////////////////////////////////////////////////////////////////
3372
3373 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3374 return Threads::is_supported_jni_version_including_1_1(version);
3375 JVM_END
3376
3377
3378 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3379 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3380 JVM_END
3381
3382 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3383 return Arguments::is_valhalla_enabled() ? JNI_TRUE : JNI_FALSE;
3384 JVM_END
3385
3386 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3387 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3388 JVM_END
3389
3390 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3391 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3392 JVM_END
3393
3394 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3395 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3396 JVM_END
3397
3398 // String support ///////////////////////////////////////////////////////////////////////////
3399
3400 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3401 JvmtiVMObjectAllocEventCollector oam;
3402 if (str == nullptr) return nullptr;
3403 oop string = JNIHandles::resolve_non_null(str);
3404 oop result = StringTable::intern(string, CHECK_NULL);
3405 return (jstring) JNIHandles::make_local(THREAD, result);
3406 JVM_END
3407
3408
3409 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3410
3411 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3412 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3413 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3414 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3415 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3416 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3417
3418
3419 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3420 VM_Exit::block_if_vm_exited();
3421 return new PlatformMutex();
3422 }
3423
3424
3425 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3426 VM_Exit::block_if_vm_exited();
3427 delete ((PlatformMutex*) mon);
3428 }
3429
3430
3431 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3432 VM_Exit::block_if_vm_exited();
3433 ((PlatformMutex*) mon)->lock();
3434 return 0;
3435 }
3436
3437
3438 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3439 VM_Exit::block_if_vm_exited();
3440 ((PlatformMutex*) mon)->unlock();
3441 }
3442
3443
3444 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3445
3446 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3447 Handle loader, jboolean throwError, TRAPS) {
3448 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3449
3450 // Check if we should initialize the class
3451 if (init && klass->is_instance_klass()) {
3452 klass->initialize(CHECK_NULL);
3453 }
3454 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3455 }
3456
3457
3458 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3459
3460 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3461 Handle method_handle;
3462 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3463 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3464 Handle receiver(THREAD, JNIHandles::resolve(obj));
3465 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3466 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3467
3468 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3469 jobject res = JNIHandles::make_local(THREAD, result);
3470 if (JvmtiExport::should_post_vm_object_alloc()) {
3471 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3472 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3473 if (java_lang_Class::is_primitive(ret_type)) {
3474 // Only for primitive type vm allocates memory for java object.
3475 // See box() method.
3476 JvmtiExport::post_vm_object_alloc(thread, result);
3477 }
3478 }
3479 return res;
3480 } else {
3481 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3482 }
3483 JVM_END
3484
3485
3486 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3487 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3488 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3489 oop constructor_mirror = JNIHandles::resolve(c);
3490 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3491 jobject res = JNIHandles::make_local(THREAD, result);
3492 if (JvmtiExport::should_post_vm_object_alloc()) {
3493 JvmtiExport::post_vm_object_alloc(thread, result);
3494 }
3495 return res;
3496 JVM_END
3497
3498 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3500 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3501 JVM_END
3502
3503 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3504 jclass caller,
3505 jstring interfaceMethodName,
3506 jobject factoryType,
3507 jobject interfaceMethodType,
3508 jobject implementationMember,
3509 jobject dynamicMethodType,
3510 jclass lambdaProxyClass))
3511 #if INCLUDE_CDS
3512 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3513 return;
3514 }
3515
3516 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3517 if (caller_ik->is_hidden()) {
3518 // Hidden classes not of type lambda proxy classes are currently not being archived.
3519 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3520 // registered for archiving.
3521 return;
3522 }
3523 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3524 assert(lambda_ik->is_hidden(), "must be a hidden class");
3525 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3526
3527 Symbol* interface_method_name = nullptr;
3528 if (interfaceMethodName != nullptr) {
3529 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3530 }
3531 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3532 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3533
3534 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3535 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3536
3537 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3538 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3539 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3540
3541 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3542 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3543
3544 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3545 interface_method_type, m, dynamic_method_type, THREAD);
3546 #endif // INCLUDE_CDS
3547 JVM_END
3548
3549 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3550 jclass caller,
3551 jstring interfaceMethodName,
3552 jobject factoryType,
3553 jobject interfaceMethodType,
3554 jobject implementationMember,
3555 jobject dynamicMethodType))
3556 #if INCLUDE_CDS
3557
3558 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3559 implementationMember == nullptr || dynamicMethodType == nullptr) {
3560 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3561 }
3562
3563 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3564 if (!caller_ik->in_aot_cache()) {
3565 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3566 return nullptr;
3567 }
3568
3569 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3570 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3571 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3572
3573 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3574 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3575
3576 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3577 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3578 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3579
3580 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3581 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3582
3583 InstanceKlass* loaded_lambda =
3584 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3585 interface_method_type, m, dynamic_method_type,
3586 CHECK_(nullptr));
3587 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3588 #else
3589 return nullptr;
3590 #endif // INCLUDE_CDS
3591 JVM_END
3592
3593 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3594 if (CDSConfig::is_dumping_static_archive()) {
3595 // We do this so that the default CDS archive can be deterministic.
3596 const char* release = VM_Version::vm_release();
3597 const char* dbg_level = VM_Version::jdk_debug_level();
3598 const char* version = VM_Version::internal_vm_info_string();
3599 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3600 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3601 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3602 seed += (jlong)VM_Version::vm_major_version();
3603 seed += (jlong)VM_Version::vm_minor_version();
3604 seed += (jlong)VM_Version::vm_security_version();
3605 seed += (jlong)VM_Version::vm_patch_version();
3606 if (seed == 0) { // don't let this ever be zero.
3607 seed = 0x87654321;
3608 }
3609 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3610 return seed;
3611 } else {
3612 return 0;
3613 }
3614 JVM_END
3615
3616 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3617 return CDSConfig::get_status();
3618 JVM_END
3619
3620 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3621 #if INCLUDE_CDS
3622 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3623 if (line != nullptr) {
3624 ResourceMark rm(THREAD);
3625 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3626 char* c_line = java_lang_String::as_utf8_string(h_line());
3627 if (CDSConfig::is_dumping_dynamic_archive()) {
3628 // Note: LambdaFormInvokers::append take same format which is not
3629 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3630 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3631 }
3632 if (ClassListWriter::is_enabled()) {
3633 ClassListWriter w;
3634 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3635 }
3636 }
3637 #endif // INCLUDE_CDS
3638 JVM_END
3639
3640 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3641 #if INCLUDE_CDS
3642 ResourceMark rm(THREAD);
3643 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3644 char* file_name = java_lang_String::as_utf8_string(file_handle());
3645 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3646 #endif // INCLUDE_CDS
3647 JVM_END
3648
3649 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3650 #if INCLUDE_CDS
3651 ResourceMark rm(THREAD);
3652 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3653 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3654 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3655 #endif // INCLUDE_CDS
3656 JVM_END
3657
3658 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3659 #if INCLUDE_CDS
3660 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3661 if (!k->is_instance_klass()) {
3662 return false;
3663 } else {
3664 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3665 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3666 // This class will be cached in AOT-initialized state. No need for init barriers.
3667 return false;
3668 } else {
3669 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3670 // must emit barriers to ensure class initialization during production run.
3671 ResourceMark rm(THREAD);
3672 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3673 return true;
3674 }
3675 }
3676 #else
3677 return false;
3678 #endif // INCLUDE_CDS
3679 JVM_END
3680
3681 // Returns an array of all live Thread objects (VM internal JavaThreads,
3682 // jvmti agent threads, and JNI attaching threads are skipped)
3683 // See CR 6404306 regarding JNI attaching threads
3684 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3685 ResourceMark rm(THREAD);
3686 ThreadsListEnumerator tle(THREAD, false, false);
3687 JvmtiVMObjectAllocEventCollector oam;
3688
3689 int num_threads = tle.num_threads();
3690 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3691 objArrayHandle threads_ah(THREAD, r);
3692
3693 for (int i = 0; i < num_threads; i++) {
3694 Handle h = tle.get_threadObj(i);
3695 threads_ah->obj_at_put(i, h());
3696 }
3697
3698 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3699 JVM_END
3700
3701
3702 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3703 // Return StackTraceElement[][], each element is the stack trace of a thread in
3704 // the corresponding entry in the given threads array
3705 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3706 JvmtiVMObjectAllocEventCollector oam;
3707
3708 // Check if threads is null
3709 if (threads == nullptr) {
3710 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3711 }
3712
3713 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3714 objArrayHandle ah(THREAD, a);
3715 int num_threads = ah->length();
3716 // check if threads is non-empty array
3717 if (num_threads == 0) {
3718 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3719 }
3720
3721 // check if threads is not an array of objects of Thread class
3722 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3723 if (k != vmClasses::Thread_klass()) {
3724 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3725 }
3726 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3727
3728 ResourceMark rm(THREAD);
3729
3730 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3731 for (int i = 0; i < num_threads; i++) {
3732 oop thread_obj = rah->obj_at(i);
3733 instanceHandle h(THREAD, (instanceOop) thread_obj);
3734 thread_handle_array->append(h);
3735 }
3736
3737 // The JavaThread references in thread_handle_array are validated
3738 // in VM_ThreadDump::doit().
3739 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3740 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3741
3742 JVM_END
3743
3744 // JVM monitoring and management support
3745 JVM_LEAF(void*, JVM_GetManagement(jint version))
3746 return Management::get_jmm_interface(version);
3747 JVM_END
3748
3749 // com.sun.tools.attach.VirtualMachine agent properties support
3750 //
3751 // Initialize the agent properties with the properties maintained in the VM
3752 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3753 ResourceMark rm;
3754
3755 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3756
3757 PUTPROP(props, "sun.java.command", Arguments::java_command());
3758 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3759 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3760 return properties;
3761 JVM_END
3762
3763 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3764 {
3765 JvmtiVMObjectAllocEventCollector oam;
3766
3767 if (ofClass == nullptr) {
3768 return nullptr;
3769 }
3770 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3771 // Special handling for primitive objects
3772 if (java_lang_Class::is_primitive(mirror())) {
3773 return nullptr;
3774 }
3775 Klass* k = java_lang_Class::as_Klass(mirror());
3776 if (!k->is_instance_klass()) {
3777 return nullptr;
3778 }
3779 InstanceKlass* ik = InstanceKlass::cast(k);
3780 int encl_method_class_idx = ik->enclosing_method_class_index();
3781 if (encl_method_class_idx == 0) {
3782 return nullptr;
3783 }
3784 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3785 objArrayHandle dest(THREAD, dest_o);
3786 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3787 dest->obj_at_put(0, enc_k->java_mirror());
3788 int encl_method_method_idx = ik->enclosing_method_method_index();
3789 if (encl_method_method_idx != 0) {
3790 Symbol* sym = ik->constants()->symbol_at(
3791 extract_low_short_from_int(
3792 ik->constants()->name_and_type_at(encl_method_method_idx)));
3793 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3794 dest->obj_at_put(1, str());
3795 sym = ik->constants()->symbol_at(
3796 extract_high_short_from_int(
3797 ik->constants()->name_and_type_at(encl_method_method_idx)));
3798 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3799 dest->obj_at_put(2, str());
3800 }
3801 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3802 }
3803 JVM_END
3804
3805 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3806 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3807 ResourceMark rm(THREAD);
3808
3809 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3810 return nullptr;
3811 }
3812
3813 char** vm_flags = Arguments::jvm_flags_array();
3814 char** vm_args = Arguments::jvm_args_array();
3815 int num_flags = Arguments::num_jvm_flags();
3816 int num_args = Arguments::num_jvm_args();
3817
3818 InstanceKlass* ik = vmClasses::String_klass();
3819 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3820 objArrayHandle result_h(THREAD, r);
3821
3822 int index = 0;
3823 for (int j = 0; j < num_flags; j++, index++) {
3824 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3825 result_h->obj_at_put(index, h());
3826 }
3827 for (int i = 0; i < num_args; i++, index++) {
3828 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3829 result_h->obj_at_put(index, h());
3830 }
3831 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3832 JVM_END
3833
3834 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3835 return os::get_signal_number(name);
3836 JVM_END
3837
3838 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread))
3839 oop vt = JNIHandles::resolve_external_guard(vthread);
3840 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/);
3841 JVM_END
3842
3843 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread))
3844 oop vt = JNIHandles::resolve_external_guard(vthread);
3845 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/);
3846 JVM_END
3847
3848 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3849 oop vt = JNIHandles::resolve_external_guard(vthread);
3850 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/);
3851 JVM_END
3852
3853 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3854 oop vt = JNIHandles::resolve_external_guard(vthread);
3855 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/);
3856 JVM_END
3857
3858 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3859 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3860 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3861 #if INCLUDE_JVMTI
3862 if (!DoJVMTIVirtualThreadTransitions) {
3863 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3864 return;
3865 }
3866 assert(thread->is_disable_suspend() != (bool)enter,
3867 "nested or unbalanced monitor enter/exit is not allowed");
3868 thread->toggle_is_disable_suspend();
3869 #endif
3870 JVM_END
3871
3872 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3873 #if INCLUDE_JFR
3874 freeze_result result = THREAD->last_freeze_fail_result();
3875 assert(result != freeze_ok, "sanity check");
3876 EventVirtualThreadPinned event(UNTIMED);
3877 event.set_starttime(THREAD->last_freeze_fail_time());
3878 if (event.should_commit()) {
3879 ResourceMark rm(THREAD);
3880 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3881 THREAD->post_vthread_pinned_event(&event, str, result);
3882 }
3883 #endif
3884 JVM_END
3885
3886 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3887 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3888 assert(parkEvent != nullptr, "not initialized");
3889
3890 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3891 oop vthread_head = nullptr;
3892 while (true) {
3893 if (list_head.peek() != nullptr) {
3894 for (;;) {
3895 oop head = list_head.resolve();
3896 if (list_head.cmpxchg(head, nullptr) == head) {
3897 return JNIHandles::make_local(THREAD, head);
3898 }
3899 }
3900 }
3901 ThreadBlockInVM tbivm(THREAD);
3902 parkEvent->park();
3903 }
3904 JVM_END
3905
3906 /*
3907 * Return the current class's class file version. The low order 16 bits of the
3908 * returned jint contain the class's major version. The high order 16 bits
3909 * contain the class's minor version.
3910 */
3911 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3912 oop mirror = JNIHandles::resolve_non_null(current);
3913 if (java_lang_Class::is_primitive(mirror)) {
3914 // return latest major version and minor version of 0.
3915 return JVM_CLASSFILE_MAJOR_VERSION;
3916 }
3917 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3918 return (ik->minor_version() << 16) | ik->major_version();
3919 JVM_END
3920
3921 /*
3922 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3923 * get the value will see a materialized value and not a scalar-replaced
3924 * null value.
3925 */
3926 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3927 JVM_EnsureMaterializedForStackWalk(env, value);
3928 JVM_END
3929
3930 /*
3931 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3932 */
3933 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3934 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3935 JVM_END