1 /*
2 * Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/aotMetaspace.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/classListParser.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/dynamicArchive.hpp"
31 #include "cds/heapShared.hpp"
32 #include "cds/lambdaFormInvokers.hpp"
33 #include "cds/lambdaProxyClassDictionary.hpp"
34 #include "classfile/classFileStream.hpp"
35 #include "classfile/classLoader.inline.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/flatArrayKlass.hpp"
62 #include "oops/inlineKlass.inline.hpp"
63 #include "oops/instanceKlass.hpp"
64 #include "oops/klass.inline.hpp"
65 #include "oops/method.hpp"
66 #include "oops/objArrayKlass.hpp"
67 #include "oops/objArrayOop.inline.hpp"
68 #include "oops/oop.inline.hpp"
69 #include "oops/oopCast.inline.hpp"
70 #include "oops/recordComponent.hpp"
71 #include "oops/refArrayOop.inline.hpp"
72 #include "oops/valuePayload.inline.hpp"
73 #include "prims/foreignGlobals.hpp"
74 #include "prims/jvm_misc.hpp"
75 #include "prims/jvmtiExport.hpp"
76 #include "prims/jvmtiThreadState.inline.hpp"
77 #include "prims/stackwalk.hpp"
78 #include "runtime/arguments.hpp"
79 #include "runtime/atomicAccess.hpp"
80 #include "runtime/continuation.hpp"
81 #include "runtime/deoptimization.hpp"
82 #include "runtime/globals_extension.hpp"
83 #include "runtime/handles.inline.hpp"
84 #include "runtime/handshake.hpp"
85 #include "runtime/init.hpp"
86 #include "runtime/interfaceSupport.inline.hpp"
87 #include "runtime/java.hpp"
88 #include "runtime/javaCalls.hpp"
89 #include "runtime/javaThread.hpp"
90 #include "runtime/jfieldIDWorkaround.hpp"
91 #include "runtime/jniHandles.inline.hpp"
92 #include "runtime/mountUnmountDisabler.hpp"
93 #include "runtime/os.inline.hpp"
94 #include "runtime/osThread.hpp"
95 #include "runtime/perfData.hpp"
96 #include "runtime/reflection.hpp"
97 #include "runtime/synchronizer.hpp"
98 #include "runtime/threadIdentifier.hpp"
99 #include "runtime/threadSMR.hpp"
100 #include "runtime/vframe.inline.hpp"
101 #include "runtime/vm_version.hpp"
102 #include "runtime/vmOperations.hpp"
103 #include "services/attachListener.hpp"
104 #include "services/management.hpp"
105 #include "services/threadService.hpp"
106 #include "utilities/checkedCast.hpp"
107 #include "utilities/copy.hpp"
108 #include "utilities/defaultStream.hpp"
109 #include "utilities/dtrace.hpp"
110 #include "utilities/events.hpp"
111 #include "utilities/macros.hpp"
112 #include "utilities/utf8.hpp"
113 #include "utilities/zipLibrary.hpp"
114 #if INCLUDE_CDS
115 #include "classfile/systemDictionaryShared.hpp"
116 #endif
117 #if INCLUDE_JFR
118 #include "jfr/jfr.hpp"
119 #endif
120 #if INCLUDE_MANAGEMENT
121 #include "services/finalizerService.hpp"
122 #endif
123
124 #include <errno.h>
125
126 /*
127 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
128 such ctors and calls MUST NOT come between an oop declaration/init and its
129 usage because if objects are move this may cause various memory stomps, bus
130 errors and segfaults. Here is a cookbook for causing so called "naked oop
131 failures":
132
133 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
134 // Object address to be held directly in mirror & not visible to GC
135 oop mirror = JNIHandles::resolve_non_null(ofClass);
136
137 // If this ctor can hit a safepoint, moving objects around, then
138 ComplexConstructor foo;
139
140 // Boom! mirror may point to JUNK instead of the intended object
141 (some dereference of mirror)
142
143 // Here's another call that may block for GC, making mirror stale
144 MutexLocker ml(some_lock);
145
146 // And here's an initializer that can result in a stale oop
147 // all in one step.
148 oop o = call_that_can_throw_exception(TRAPS);
149
150
151 The solution is to keep the oop declaration BELOW the ctor or function
152 call that might cause a GC, do another resolve to reassign the oop, or
153 consider use of a Handle instead of an oop so there is immunity from object
154 motion. But note that the "QUICK" entries below do not have a handlemark
155 and thus can only support use of handles passed in.
156 */
157
158 extern void trace_class_resolution(Klass* to_class) {
159 ResourceMark rm;
160 int line_number = -1;
161 const char * source_file = nullptr;
162 const char * trace = "explicit";
163 InstanceKlass* caller = nullptr;
164 JavaThread* jthread = JavaThread::current();
165 if (jthread->has_last_Java_frame()) {
166 vframeStream vfst(jthread);
167
168 // Scan up the stack skipping ClassLoader frames.
169 Method* last_caller = nullptr;
170
171 while (!vfst.at_end()) {
172 Method* m = vfst.method();
173 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
174 break;
175 }
176 last_caller = m;
177 vfst.next();
178 }
179 // if this is called from Class.forName0 and that is called from Class.forName,
180 // then print the caller of Class.forName. If this is Class.loadClass, then print
181 // that caller, otherwise keep quiet since this should be picked up elsewhere.
182 bool found_it = false;
183 if (!vfst.at_end() &&
184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
185 vfst.method()->name() == vmSymbols::forName0_name()) {
186 vfst.next();
187 if (!vfst.at_end() &&
188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
189 vfst.method()->name() == vmSymbols::forName_name()) {
190 vfst.next();
191 found_it = true;
192 }
193 } else if (last_caller != nullptr &&
194 last_caller->method_holder()->name() ==
195 vmSymbols::java_lang_ClassLoader() &&
196 last_caller->name() == vmSymbols::loadClass_name()) {
197 found_it = true;
198 } else if (!vfst.at_end()) {
199 if (vfst.method()->is_native()) {
200 // JNI call
201 found_it = true;
202 }
203 }
204 if (found_it && !vfst.at_end()) {
205 // found the caller
206 caller = vfst.method()->method_holder();
207 line_number = vfst.method()->line_number_from_bci(vfst.bci());
208 if (line_number == -1) {
209 // show method name if it's a native method
210 trace = vfst.method()->name_and_sig_as_C_string();
211 }
212 Symbol* s = caller->source_file_name();
213 if (s != nullptr) {
214 source_file = s->as_C_string();
215 }
216 }
217 }
218 if (caller != nullptr) {
219 if (to_class != caller) {
220 const char * from = caller->external_name();
221 const char * to = to_class->external_name();
222 // print in a single call to reduce interleaving between threads
223 if (source_file != nullptr) {
224 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
225 } else {
226 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
227 }
228 }
229 }
230 }
231
232 // java.lang.System //////////////////////////////////////////////////////////////////////
233
234 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env))
235 #if INCLUDE_CDS
236 if (CDSConfig::is_dumping_preimage_static_archive()) {
237 if (!AOTMetaspace::preimage_static_archive_dumped()) {
238 AOTMetaspace::dump_static_archive(THREAD);
239 return JNI_TRUE;
240 }
241 }
242 return JNI_FALSE;
243 #else
244 return JNI_FALSE;
245 #endif // INCLUDE_CDS
246 JVM_END
247
248 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
249 return os::javaTimeMillis();
250 JVM_END
251
252 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
253 return os::javaTimeNanos();
254 JVM_END
255
256 // The function below is actually exposed by jdk.internal.misc.VM and not
257 // java.lang.System, but we choose to keep it here so that it stays next
258 // to JVM_CurrentTimeMillis and JVM_NanoTime
259
260 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
261 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
262
263 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
264 jlong seconds;
265 jlong nanos;
266
267 os::javaTimeSystemUTC(seconds, nanos);
268
269 // We're going to verify that the result can fit in a long.
270 // For that we need the difference in seconds between 'seconds'
271 // and 'offset_secs' to be such that:
272 // |seconds - offset_secs| < (2^63/10^9)
273 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
274 // which makes |seconds - offset_secs| < 2^33
275 // and we will prefer +/- 2^32 as the maximum acceptable diff
276 // as 2^32 has a more natural feel than 2^33...
277 //
278 // So if |seconds - offset_secs| >= 2^32 - we return a special
279 // sentinel value (-1) which the caller should take as an
280 // exception value indicating that the offset given to us is
281 // too far from range of the current time - leading to too big
282 // a nano adjustment. The caller is expected to recover by
283 // computing a more accurate offset and calling this method
284 // again. (For the record 2^32 secs is ~136 years, so that
285 // should rarely happen)
286 //
287 jlong diff = seconds - offset_secs;
288 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
289 return -1; // sentinel value: the offset is too far off the target
290 }
291
292 // return the adjustment. If you compute a time by adding
293 // this number of nanoseconds along with the number of seconds
294 // in the offset you should get the current UTC time.
295 return (diff * (jlong)1000000000) + nanos;
296 JVM_END
297
298 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
299 jobject dst, jint dst_pos, jint length))
300 // Check if we have null pointers
301 if (src == nullptr || dst == nullptr) {
302 THROW(vmSymbols::java_lang_NullPointerException());
303 }
304 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
305 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
306 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
307 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
308 // Do copy
309 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
310 JVM_END
311
312
313 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
314 JavaValue r(T_OBJECT);
315 // public synchronized Object put(Object key, Object value);
316 HandleMark hm(THREAD);
317 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
318 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
319 JavaCalls::call_virtual(&r,
320 props,
321 vmClasses::Properties_klass(),
322 vmSymbols::put_name(),
323 vmSymbols::object_object_object_signature(),
324 key_str,
325 value_str,
326 THREAD);
327 }
328
329
330 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
331
332 /*
333 * Return all of the system properties in a Java String array with alternating
334 * names and values from the jvm SystemProperty.
335 * Which includes some internal and all commandline -D defined properties.
336 */
337 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
338 ResourceMark rm(THREAD);
339 HandleMark hm(THREAD);
340 int ndx = 0;
341 int fixedCount = 2;
342
343 SystemProperty* p = Arguments::system_properties();
344 int count = Arguments::PropertyList_count(p);
345
346 // Allocate result String array
347 InstanceKlass* ik = vmClasses::String_klass();
348 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
349 objArrayHandle result_h(THREAD, r);
350
351 while (p != nullptr) {
352 const char * key = p->key();
353 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
354 const char * value = p->value();
355 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
356 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
357 result_h->obj_at_put(ndx * 2, key_str());
358 result_h->obj_at_put(ndx * 2 + 1, value_str());
359 ndx++;
360 }
361 p = p->next();
362 }
363
364 // Convert the -XX:MaxDirectMemorySize= command line flag
365 // to the sun.nio.MaxDirectMemorySize property.
366 // Do this after setting user properties to prevent people
367 // from setting the value with a -D option, as requested.
368 // Leave empty if not supplied
369 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
370 char as_chars[256];
371 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
372 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
373 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
374 result_h->obj_at_put(ndx * 2, key_str());
375 result_h->obj_at_put(ndx * 2 + 1, value_str());
376 ndx++;
377 }
378
379 // JVM monitoring and management support
380 // Add the sun.management.compiler property for the compiler's name
381 {
382 #undef CSIZE
383 #if defined(_LP64)
384 #define CSIZE "64-Bit "
385 #else
386 #define CSIZE
387 #endif // 64bit
388
389 #if COMPILER1_AND_COMPILER2
390 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
391 #else
392 #if defined(COMPILER1)
393 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
394 #elif defined(COMPILER2)
395 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
396 #else
397 const char* compiler_name = "";
398 #endif // compilers
399 #endif // COMPILER1_AND_COMPILER2
400
401 if (*compiler_name != '\0' &&
402 (Arguments::mode() != Arguments::_int)) {
403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
404 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
405 result_h->obj_at_put(ndx * 2, key_str());
406 result_h->obj_at_put(ndx * 2 + 1, value_str());
407 ndx++;
408 }
409 }
410
411 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
412 JVM_END
413
414
415 /*
416 * Return the temporary directory that the VM uses for the attach
417 * and perf data files.
418 *
419 * It is important that this directory is well-known and the
420 * same for all VM instances. It cannot be affected by configuration
421 * variables such as java.io.tmpdir.
422 */
423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
424 HandleMark hm(THREAD);
425 const char* temp_dir = os::get_temp_directory();
426 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
427 return (jstring) JNIHandles::make_local(THREAD, h());
428 JVM_END
429
430 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
431 oop o = JNIHandles::resolve_non_null(orig);
432 assert(o->is_array(), "Must be");
433 oop array = nullptr;
434 arrayOop org = (arrayOop)o;
435 arrayHandle oh(THREAD, org);
436 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
437 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
438 int len = to - from; // length of the new array
439 if (ak->is_null_free_array_klass()) {
440 if ((len != 0) && (from >= org->length() || to > org->length())) {
441 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
442 }
443 }
444 if (ak->is_flatArray_klass()) {
445 // The whole JVM_CopyOfSpecialArray is currently broken. Fix this in a separate bugfix.
446 int org_length = org->length();
447 int copy_len = MIN2(to, org_length) - MIN2(from, org_length);
448 FlatArrayKlass* const fak = FlatArrayKlass::cast(org->klass());
449 flatArrayOop dst = fak->allocate_instance(len, CHECK_NULL);
450 assert(!ak->is_null_free_array_klass() || copy_len == len,
451 "Failed to throw the IllegalArgumentException");
452 if (copy_len != 0) {
453 int start = MIN2(from, org_length - 1);
454 FlatArrayPayload src_payload(flatArrayOop(oh()), start, fak);
455 FlatArrayPayload dst_payload(dst, 0, fak);
456 int end = to < oh()->length() ? to : oh()->length();
457 for (int i = from; i < end; i++) {
458 // Copy a value
459 src_payload.copy_to(dst_payload);
460
461 // Advance to the next element
462 src_payload.next_element();
463 dst_payload.next_element();
464 }
465 }
466 array = dst;
467 } else {
468 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(ak->is_null_free_array_klass());
469
470 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
471 int end = to < oh()->length() ? to : oh()->length();
472 for (int i = from; i < end; i++) {
473 if (i < ((objArrayOop)oh())->length()) {
474 oop val = ((objArrayOop)oh())->obj_at(i, CHECK_NULL);
475 ((objArrayOop)array)->obj_at_put(i - from, val);
476 } else {
477 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
478 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
479 }
480 }
481 }
482 return (jarray) JNIHandles::make_local(THREAD, array);
483 JVM_END
484
485 #ifdef ASSERT
486 static void verify_array_arguments(jclass elmClass, jint len) {
487 assert(len >= 0, "Negative array length");
488 assert(elmClass != nullptr, "Null element class");
489 oop mirror = JNIHandles::resolve_non_null(elmClass);
490 Klass* klass = java_lang_Class::as_Klass(mirror);
491 assert(klass->is_inline_klass(), "Element class must be an inline class");
492 }
493 #endif // ASSERT
494
495 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
496 DEBUG_ONLY(verify_array_arguments(elmClass, len));
497 oop mirror = JNIHandles::resolve_non_null(elmClass);
498 Klass* klass = java_lang_Class::as_Klass(mirror);
499 oop init = JNIHandles::resolve_non_null(initVal);
500 Handle init_h(THREAD, init);
501 assert(klass == init_h()->klass(), "Type mismatch between array and initial value");
502 const ArrayProperties props = ArrayProperties::Default()
503 .with_null_restricted()
504 .with_non_atomic();
505 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
506 for (int i = 0; i < len; i++) {
507 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
508 }
509 return (jarray) JNIHandles::make_local(THREAD, array);
510 JVM_END
511
512 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
513 DEBUG_ONLY(verify_array_arguments(elmClass, len);)
514 oop mirror = JNIHandles::resolve_non_null(elmClass);
515 Klass* klass = java_lang_Class::as_Klass(mirror);
516 oop init = JNIHandles::resolve_non_null(initVal);
517 Handle init_h(THREAD, init);
518 assert(klass == init_h()->klass(), "Type mismatch between array and initial value");
519 const ArrayProperties props = ArrayProperties::Default().with_null_restricted();
520 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
521 for (int i = 0; i < len; i++) {
522 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
523 }
524 return (jarray) JNIHandles::make_local(THREAD, array);
525 JVM_END
526
527 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
528 DEBUG_ONLY(verify_array_arguments(elmClass, len);)
529 oop mirror = JNIHandles::resolve_non_null(elmClass);
530 Klass* klass = java_lang_Class::as_Klass(mirror);
531 objArrayOop array = oopFactory::new_objArray(klass, len, ArrayProperties::Default(), CHECK_NULL);
532 return (jarray) JNIHandles::make_local(THREAD, array);
533 JVM_END
534
535 JVM_ENTRY(jarray, JVM_NewReferenceArray(JNIEnv *env, jclass elmClass, jint len))
536 DEBUG_ONLY(verify_array_arguments(elmClass, len);)
537 oop mirror = JNIHandles::resolve_non_null(elmClass);
538 Klass* klass = java_lang_Class::as_Klass(mirror);
539 refArrayOop array = oopFactory::new_refArray(klass, len, ArrayProperties::Default(), CHECK_NULL);
540 return (jarray) JNIHandles::make_local(THREAD, array);
541 JVM_END
542
543 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jarray array))
544 oop o = JNIHandles::resolve_non_null(array);
545 Klass* klass = o->klass();
546
547 assert(klass->is_objArray_klass(), "Expects an object array");
548
549 return klass->is_flatArray_klass();
550 JVM_END
551
552 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jarray array))
553 oop o = JNIHandles::resolve_non_null(array);
554 Klass* klass = o->klass();
555
556 assert(klass->is_objArray_klass(), "Expects an object array");
557
558 return klass->is_null_free_array_klass();
559 JVM_END
560
561 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jarray array))
562 // There are multiple cases where an array can/must support atomic access:
563 // - the array is a reference array
564 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT
565 // - the array is flat and its component type is naturally atomic
566 oop o = JNIHandles::resolve_non_null(array);
567 Klass* klass = o->klass();
568
569 assert(klass->is_objArray_klass(), "Expects an object array");
570
571 if (klass->is_refArray_klass()) {
572 return true;
573 }
574
575 if (klass->is_flatArray_klass()) {
576 FlatArrayKlass* fak = FlatArrayKlass::cast(klass);
577 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) {
578 return true;
579 }
580 bool is_null_free = !LayoutKindHelper::is_nullable_flat(fak->layout_kind());
581 if (fak->element_klass()->is_naturally_atomic(is_null_free)) {
582 return true;
583 }
584
585 return false;
586 }
587
588 ShouldNotReachHere();
589 JVM_END
590
591 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
592
593 extern volatile jint vm_created;
594
595 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
596 EventShutdown event;
597 if (event.should_commit()) {
598 event.set_reason("Shutdown requested from Java");
599 event.commit();
600 }
601 JVM_END
602
603
604 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
605 before_exit(thread, true);
606 vm_exit(code);
607 JVM_END
608
609
610 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
611 if (!DisableExplicitGC) {
612 EventSystemGC event;
613 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
614 Universe::heap()->collect(GCCause::_java_lang_system_gc);
615 event.commit();
616 }
617 JVM_END
618
619
620 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
621 return Universe::heap()->millis_since_last_whole_heap_examined();
622 JVM_END
623
624
625 static inline jlong convert_size_t_to_jlong(size_t val) {
626 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
627 NOT_LP64 (return (jlong)val;)
628 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
629 }
630
631 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
632 size_t n = Universe::heap()->capacity();
633 return convert_size_t_to_jlong(n);
634 JVM_END
635
636
637 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
638 size_t n = Universe::heap()->unused();
639 return convert_size_t_to_jlong(n);
640 JVM_END
641
642
643 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
644 size_t n = Universe::heap()->max_capacity();
645 return convert_size_t_to_jlong(n);
646 JVM_END
647
648
649 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
650 return os::active_processor_count();
651 JVM_END
652
653 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
654 #ifdef LINUX
655 if (UseContainerSupport) {
656 return JNI_TRUE;
657 }
658 #endif
659 return JNI_FALSE;
660 JVM_END
661
662 JVM_LEAF(jboolean, JVM_IsContainerized(void))
663 if (os::is_containerized()) {
664 return JNI_TRUE;
665 }
666 return JNI_FALSE;
667 JVM_END
668
669 // java.lang.Throwable //////////////////////////////////////////////////////
670
671 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
672 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
673 java_lang_Throwable::fill_in_stack_trace(exception);
674 JVM_END
675
676 // java.lang.NullPointerException ///////////////////////////////////////////
677
678 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
679 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
680
681 oop exc = JNIHandles::resolve_non_null(throwable);
682
683 Method* method;
684 int bci;
685 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
686 return nullptr;
687 }
688 if (method->is_native()) {
689 return nullptr;
690 }
691
692 stringStream ss;
693 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
694 if (ok) {
695 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
696 return (jstring) JNIHandles::make_local(THREAD, result);
697 } else {
698 return nullptr;
699 }
700 JVM_END
701
702 // java.lang.StackTraceElement //////////////////////////////////////////////
703
704
705 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
706 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
707 refArrayOop st = refArrayOop(JNIHandles::resolve(elements));
708 refArrayHandle stack_trace(THREAD, st);
709 // Fill in the allocated stack trace
710 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
711 JVM_END
712
713
714 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
715 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
716 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
717 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
718 JVM_END
719
720
721 // java.lang.StackWalker //////////////////////////////////////////////////////
722 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
723 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
724
725 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
726 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
727 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
728 if (!have_name) {
729 oop name = StringTable::intern(method->name(), CHECK);
730 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
731 }
732 if (!have_type) {
733 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
734 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
735 }
736 JVM_END
737
738 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
739 jint skip_frames, jobject contScope, jobject cont,
740 jint buffer_size, jint start_index, jobjectArray frames))
741 if (!thread->has_last_Java_frame()) {
742 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
743 }
744
745 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
746 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
747 Handle cont_h(THREAD, JNIHandles::resolve(cont));
748 // frames array is a ClassFrameInfo[] array when only getting caller reference,
749 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
750 // be null.
751 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
752 refArrayHandle frames_array_h(THREAD, fa);
753
754 if (frames_array_h->length() < buffer_size) {
755 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
756 }
757
758 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
759 buffer_size, start_index, frames_array_h, CHECK_NULL);
760 return JNIHandles::make_local(THREAD, result);
761 JVM_END
762
763
764 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
765 jint last_batch_count, jint buffer_size, jint start_index,
766 jobjectArray frames))
767 // frames array is a ClassFrameInfo[] array when only getting caller reference,
768 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
769 // be null.
770 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
771 refArrayHandle frames_array_h(THREAD, fa);
772
773 if (frames_array_h->length() < buffer_size) {
774 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
775 }
776
777 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
778 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
779 start_index, frames_array_h, THREAD);
780 JVM_END
781
782 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
783 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
784 refArrayHandle frames_array_h(THREAD, fa);
785 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
786 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
787
788 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
789 JVM_END
790
791 // java.lang.Object ///////////////////////////////////////////////
792
793
794 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
795 // as implemented in the classic virtual machine; return 0 if object is null
796 if (handle == nullptr) {
797 return 0;
798 }
799 oop obj = JNIHandles::resolve_non_null(handle);
800 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) {
801 const intptr_t obj_identity_hash = obj->mark().hash();
802 // Check if mark word contains hash code already.
803 // It is possible that the generated identity hash is 0, which is not
804 // distinct from the no_hash value. In such a case, the hash will be
805 // computed and set every time JVM_IHashCode is called. If that happens,
806 // the only consequence is losing out on the optimization.
807 if (obj_identity_hash != markWord::no_hash) {
808 return checked_cast<jint>(obj_identity_hash);
809 }
810
811 // Compute hash by calling ValueObjectMethods.valueObjectHashCode.
812 // The identity hash is invariantly immutable (see its JavaDoc comment).
813 JavaValue result(T_INT);
814 JavaCallArguments args;
815 Handle ho(THREAD, obj);
816 args.push_oop(ho);
817 methodHandle method(THREAD, Universe::value_object_hash_code_method());
818 JavaCalls::call(&result, method, &args, THREAD);
819 Exceptions::wrap_exception_in_internal_error("Internal error in hashCode", CHECK_0);
820
821 const intptr_t identity_hash = result.get_jint();
822
823 // We now have to set the hash via CAS. It's possible that this will race
824 // other threads. By our invariant of immutability, when there is a
825 // race, the identity hash code is going to be one of the following:
826 // a) 0, another thread updated other markWord bits; b) identity_hash set
827 // by another thread; or c) identity_hash set by the current thread.
828 // A nonzero identity hash code that is not the identity_hash computed
829 // earlier indicates a violation of the invariant.
830 markWord current_mark, old_mark, new_mark;
831 do {
832 current_mark = ho->mark();
833 new_mark = current_mark.copy_set_hash(identity_hash);
834 old_mark = ho->cas_set_mark(new_mark, current_mark);
835 assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(),
836 "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT,
837 new_mark.hash(),
838 old_mark.hash());
839 } while (old_mark != current_mark);
840
841 return checked_cast<jint>(new_mark.hash());
842 } else {
843 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
844 }
845 JVM_END
846
847
848 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
849 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
850 ObjectSynchronizer::wait(obj, ms, CHECK);
851 JVM_END
852
853
854 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
855 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
856 ObjectSynchronizer::notify(obj, CHECK);
857 JVM_END
858
859
860 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
861 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
862 ObjectSynchronizer::notifyall(obj, CHECK);
863 JVM_END
864
865
866 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
867 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
868 Klass* klass = obj->klass();
869 JvmtiVMObjectAllocEventCollector oam;
870
871 #ifdef ASSERT
872 // Just checking that the cloneable flag is set correct
873 if (obj->is_array()) {
874 guarantee(klass->is_cloneable(), "all arrays are cloneable");
875 } else {
876 guarantee(obj->is_instance(), "should be instanceOop");
877 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
878 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
879 }
880 #endif
881
882 // Check if class of obj supports the Cloneable interface.
883 // All arrays are considered to be cloneable (See JLS 20.1.5).
884 // All j.l.r.Reference classes are considered non-cloneable.
885 if (!klass->is_cloneable() ||
886 (klass->is_instance_klass() &&
887 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
888 ResourceMark rm(THREAD);
889 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
890 }
891
892 if (klass->is_inline_klass()) {
893 // Value instances have no identity, so return the current instance instead of allocating a new one
894 // Value classes cannot have finalizers, so the method can return immediately
895 return JNIHandles::make_local(THREAD, obj());
896 }
897
898 // Make shallow object copy
899 const size_t size = obj->size();
900 oop new_obj_oop = nullptr;
901 if (obj->is_array()) {
902 const int length = ((arrayOop)obj())->length();
903 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
904 /* do_zero */ true, CHECK_NULL);
905 } else {
906 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
907 }
908
909 HeapAccess<>::clone(obj(), new_obj_oop, size);
910
911 Handle new_obj(THREAD, new_obj_oop);
912 // Caution: this involves a java upcall, so the clone should be
913 // "gc-robust" by this stage.
914 if (klass->has_finalizer()) {
915 assert(obj->is_instance(), "should be instanceOop");
916 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
917 new_obj = Handle(THREAD, new_obj_oop);
918 }
919
920 return JNIHandles::make_local(THREAD, new_obj());
921 JVM_END
922
923 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
924
925 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
926 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
927 JVM_END
928
929 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
930 return InstanceKlass::is_finalization_enabled();
931 JVM_END
932
933 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
934
935 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
936 CONT_RegisterNativeMethods(env, cls);
937 JVM_END
938
939 // java.io.File ///////////////////////////////////////////////////////////////
940
941 JVM_LEAF(char*, JVM_NativePath(char* path))
942 return os::native_path(path);
943 JVM_END
944
945
946 // Misc. class handling ///////////////////////////////////////////////////////////
947
948
949 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
950 // Getting the class of the caller frame.
951 //
952 // The call stack at this point looks something like this:
953 //
954 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
955 // [1] [ @CallerSensitive API.method ]
956 // [.] [ (skipped intermediate frames) ]
957 // [n] [ caller ]
958 vframeStream vfst(thread);
959 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
960 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
961 Method* m = vfst.method();
962 assert(m != nullptr, "sanity");
963 switch (n) {
964 case 0:
965 // This must only be called from Reflection.getCallerClass
966 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
967 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
968 }
969 // fall-through
970 case 1:
971 // Frame 0 and 1 must be caller sensitive.
972 if (!m->caller_sensitive()) {
973 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
974 }
975 break;
976 default:
977 if (!m->is_ignored_by_security_stack_walk()) {
978 // We have reached the desired frame; return the holder class.
979 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
980 }
981 break;
982 }
983 }
984 return nullptr;
985 JVM_END
986
987
988 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
989 oop mirror = nullptr;
990 BasicType t = name2type(utf);
991 if (t != T_ILLEGAL && !is_reference_type(t)) {
992 mirror = Universe::java_mirror(t);
993 }
994 if (mirror == nullptr) {
995 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
996 } else {
997 return (jclass) JNIHandles::make_local(THREAD, mirror);
998 }
999 JVM_END
1000
1001
1002 // Returns a class loaded by the bootstrap class loader; or null
1003 // if not found. ClassNotFoundException is not thrown.
1004 // FindClassFromBootLoader is exported to the launcher for windows.
1005 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
1006 const char* name))
1007 // Java libraries should ensure that name is never null or illegal.
1008 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
1009 // It's impossible to create this class; the name cannot fit
1010 // into the constant pool.
1011 return nullptr;
1012 }
1013 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
1014
1015 TempNewSymbol h_name = SymbolTable::new_symbol(name);
1016 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
1017 if (k == nullptr) {
1018 return nullptr;
1019 }
1020
1021 if (log_is_enabled(Debug, class, resolve)) {
1022 trace_class_resolution(k);
1023 }
1024 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1025 JVM_END
1026
1027 // Find a class with this name in this loader.
1028 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
1029 jboolean init, jobject loader))
1030 TempNewSymbol h_name =
1031 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1032 CHECK_NULL);
1033
1034 oop loader_oop = JNIHandles::resolve(loader);
1035 Handle h_loader(THREAD, loader_oop);
1036
1037 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1038 false, THREAD);
1039
1040 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1041 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1042 }
1043 return result;
1044 JVM_END
1045
1046 // Currently only called from the old verifier.
1047 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1048 jboolean init, jclass from))
1049 TempNewSymbol h_name =
1050 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1051 CHECK_NULL);
1052 oop from_class_oop = JNIHandles::resolve(from);
1053 assert(from_class_oop != nullptr, "must be");
1054 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1055 assert(from_class != nullptr, "must be");
1056 oop class_loader = from_class->class_loader();
1057
1058 Handle h_loader(THREAD, class_loader);
1059 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1060
1061 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1062 // this function is generally only used for class loading during verification.
1063 ResourceMark rm;
1064 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1065 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1066 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1067 }
1068
1069 #if INCLUDE_CDS
1070 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1071 InstanceKlass* ik = InstanceKlass::cast(from_class);
1072 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1073 }
1074 #endif
1075
1076 return result;
1077 JVM_END
1078
1079 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1080 static jclass jvm_define_class_common(const char *name,
1081 jobject loader, const jbyte *buf,
1082 jsize len, jobject pd, const char *source,
1083 TRAPS) {
1084 if (source == nullptr) source = "__JVM_DefineClass__";
1085
1086 JavaThread* jt = THREAD;
1087
1088 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1089 ClassLoader::perf_define_appclass_selftime(),
1090 ClassLoader::perf_define_appclasses(),
1091 jt->get_thread_stat()->perf_recursion_counts_addr(),
1092 jt->get_thread_stat()->perf_timers_addr(),
1093 PerfClassTraceTime::DEFINE_CLASS);
1094
1095 if (UsePerfData) {
1096 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1097 }
1098
1099 // Class resolution will get the class name from the .class stream if the name is null.
1100 TempNewSymbol class_name = name == nullptr ? nullptr :
1101 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1102 CHECK_NULL);
1103
1104 ResourceMark rm(THREAD);
1105 ClassFileStream st((u1*)buf, len, source);
1106 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1107 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1108 ClassLoadInfo cl_info(protection_domain);
1109 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1110 class_loader,
1111 cl_info,
1112 CHECK_NULL);
1113
1114 if (log_is_enabled(Debug, class, resolve)) {
1115 trace_class_resolution(k);
1116 }
1117
1118 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1119 }
1120
1121 enum {
1122 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1123 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1124 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1125 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1126 };
1127
1128 /*
1129 * Define a class with the specified flags that indicates if it's a nestmate,
1130 * hidden, or strongly referenced from class loader.
1131 */
1132 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1133 const jbyte *buf, jsize len, jobject pd,
1134 jboolean init, int flags, jobject classData, TRAPS) {
1135 ResourceMark rm(THREAD);
1136
1137 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1138 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1139 if (lookup_k == nullptr) {
1140 // The error message is wrong. We come here only if lookup is a primitive class
1141 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1142 }
1143
1144 Handle class_loader (THREAD, lookup_k->class_loader());
1145
1146 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1147 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1148 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1149 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1150
1151 InstanceKlass* host_class = nullptr;
1152 if (is_nestmate) {
1153 host_class = lookup_k->nest_host(CHECK_NULL);
1154 }
1155
1156 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1157 name,
1158 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1159 is_nestmate ? host_class->external_name() : "",
1160 is_hidden ? "hidden" : "not hidden",
1161 is_strong ? "strong" : "weak",
1162 vm_annotations ? "with vm annotations" : "without vm annotation");
1163
1164 if (!is_hidden) {
1165 // classData is only applicable for hidden classes
1166 if (classData != nullptr) {
1167 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1168 }
1169 if (is_nestmate) {
1170 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1171 }
1172 if (!is_strong) {
1173 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1174 }
1175 if (vm_annotations) {
1176 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1177 }
1178 if (flags != STRONG_LOADER_LINK) {
1179 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1180 err_msg("invalid flag 0x%x", flags));
1181 }
1182 }
1183
1184 // Class resolution will get the class name from the .class stream if the name is null.
1185 TempNewSymbol class_name = name == nullptr ? nullptr :
1186 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1187 CHECK_NULL);
1188
1189 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1190 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1191 ClassFileStream st((u1*)buf, len, source);
1192
1193 InstanceKlass* ik = nullptr;
1194 if (!is_hidden) {
1195 ClassLoadInfo cl_info(protection_domain);
1196 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1197 class_loader,
1198 cl_info,
1199 CHECK_NULL);
1200
1201 if (log_is_enabled(Debug, class, resolve)) {
1202 trace_class_resolution(ik);
1203 }
1204 } else { // hidden
1205 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1206 ClassLoadInfo cl_info(protection_domain,
1207 host_class,
1208 classData_h,
1209 is_hidden,
1210 is_strong,
1211 vm_annotations);
1212 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1213 class_loader,
1214 cl_info,
1215 CHECK_NULL);
1216
1217 // The hidden class loader data has been artificially been kept alive to
1218 // this point. The mirror and any instances of this class have to keep
1219 // it alive afterwards.
1220 ik->class_loader_data()->dec_keep_alive_ref_count();
1221
1222 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1223 ModuleEntry* module = ik->module();
1224 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1225 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1226 module_name,
1227 ik->external_name(),
1228 host_class->external_name(),
1229 ik->is_hidden() ? "is hidden" : "is not hidden");
1230 }
1231 }
1232
1233 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1234 // non-hidden class or nestmate class must be in the same package as the Lookup class
1235 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1236 }
1237
1238 if (init) {
1239 ik->initialize(CHECK_NULL);
1240 } else {
1241 ik->link_class(CHECK_NULL);
1242 }
1243
1244 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1245 }
1246
1247 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1248 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1249 JVM_END
1250
1251 /*
1252 * Define a class with the specified lookup class.
1253 * lookup: Lookup class
1254 * name: the name of the class
1255 * buf: class bytes
1256 * len: length of class bytes
1257 * pd: protection domain
1258 * init: initialize the class
1259 * flags: properties of the class
1260 * classData: private static pre-initialized field
1261 */
1262 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1263 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1264
1265 if (lookup == nullptr) {
1266 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1267 }
1268
1269 assert(buf != nullptr, "buf must not be null");
1270
1271 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1272 JVM_END
1273
1274 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1275
1276 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1277 JVM_END
1278
1279 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1280 ResourceMark rm(THREAD);
1281
1282 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1283 char* str = java_lang_String::as_utf8_string(h_name());
1284
1285 // Sanity check, don't expect null
1286 if (str == nullptr) return nullptr;
1287
1288 // Internalize the string, converting '.' to '/' in string.
1289 char* p = (char*)str;
1290 while (*p != '\0') {
1291 if (*p == '.') {
1292 *p = '/';
1293 }
1294 p++;
1295 }
1296
1297 const int str_len = (int)(p - str);
1298 if (str_len > Symbol::max_length()) {
1299 // It's impossible to create this class; the name cannot fit
1300 // into the constant pool.
1301 return nullptr;
1302 }
1303 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1304
1305 // Security Note:
1306 // The Java level wrapper will perform the necessary security check allowing
1307 // us to pass the null as the initiating class loader.
1308 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1309 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1310 #if INCLUDE_CDS
1311 if (k == nullptr) {
1312 // If the class is not already loaded, try to see if it's in the shared
1313 // archive for the current classloader (h_loader).
1314 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1315 }
1316 #endif
1317 return (k == nullptr) ? nullptr :
1318 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1319 JVM_END
1320
1321 // Module support //////////////////////////////////////////////////////////////////////////////
1322
1323 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1324 jstring location, jobjectArray packages))
1325 Handle h_module (THREAD, JNIHandles::resolve(module));
1326 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1327 JVM_END
1328
1329 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1330 Handle h_module (THREAD, JNIHandles::resolve(module));
1331 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1332 JVM_END
1333
1334 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1335 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1336 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1337 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1338 JVM_END
1339
1340 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1341 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1342 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1343 JVM_END
1344
1345 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1346 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1347 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1348 JVM_END
1349
1350 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1351 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1352 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1353 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1354 JVM_END
1355
1356 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1357 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1358 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1359 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1360 JVM_END
1361
1362 // Reflection support //////////////////////////////////////////////////////////////////////////////
1363
1364 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1365 assert (cls != nullptr, "illegal class");
1366 JvmtiVMObjectAllocEventCollector oam;
1367 ResourceMark rm(THREAD);
1368 HandleMark hm(THREAD);
1369 Handle java_class(THREAD, JNIHandles::resolve(cls));
1370 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1371 return (jstring) JNIHandles::make_local(THREAD, result);
1372 JVM_END
1373
1374
1375 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1376 JvmtiVMObjectAllocEventCollector oam;
1377 oop mirror = JNIHandles::resolve_non_null(cls);
1378
1379 // Special handling for primitive objects
1380 if (java_lang_Class::is_primitive(mirror)) {
1381 // Primitive objects does not have any interfaces
1382 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1383 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1384 }
1385
1386 Klass* klass = java_lang_Class::as_Klass(mirror);
1387 // Figure size of result array
1388 int size;
1389 if (klass->is_instance_klass()) {
1390 InstanceKlass* ik = InstanceKlass::cast(klass);
1391 size = ik->local_interfaces()->length();
1392 } else {
1393 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1394 size = 2;
1395 }
1396
1397 // Allocate result array
1398 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1399 objArrayHandle result (THREAD, r);
1400 // Fill in result
1401 if (klass->is_instance_klass()) {
1402 // Regular instance klass, fill in all local interfaces
1403 for (int index = 0; index < size; index++) {
1404 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1405 result->obj_at_put(index, k->java_mirror());
1406 }
1407 } else {
1408 // All arrays implement java.lang.Cloneable and java.io.Serializable
1409 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1410 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1411 }
1412 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1413 JVM_END
1414
1415
1416 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1417 oop mirror = JNIHandles::resolve_non_null(cls);
1418 if (java_lang_Class::is_primitive(mirror)) {
1419 return JNI_FALSE;
1420 }
1421 Klass* k = java_lang_Class::as_Klass(mirror);
1422 return k->is_hidden();
1423 JVM_END
1424
1425
1426 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1427 ResourceMark rm(THREAD);
1428 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1429 JvmtiVMObjectAllocEventCollector oam;
1430
1431 // Iterate through Java frames
1432 vframeStream vfst(thread);
1433 for(; !vfst.at_end(); vfst.next()) {
1434 int loc = -1;
1435 // get method of frame
1436 Method* method = vfst.method();
1437
1438 Symbol *name = method->name();
1439
1440 InstanceKlass* holder = method->method_holder();
1441 if (name == vmSymbols::runWith_method_name()) {
1442 if (holder == vmClasses::Thread_klass()
1443 || holder == vmClasses::ScopedValue_Carrier_klass()) {
1444 loc = 1;
1445 }
1446 }
1447
1448 if (loc != -1) {
1449 javaVFrame *frame = vfst.asJavaVFrame();
1450 StackValueCollection* locals = frame->locals();
1451 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1452 Handle result = head_sv->get_obj();
1453 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1454 if (result() != nullptr) {
1455 return JNIHandles::make_local(THREAD, result());
1456 }
1457 }
1458 }
1459
1460 return nullptr;
1461 JVM_END
1462
1463 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1464 JvmtiVMObjectAllocEventCollector oam;
1465 // ofClass is a reference to a java_lang_Class object. The mirror object
1466 // of an InstanceKlass
1467 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1468 if (java_lang_Class::is_primitive(ofMirror) ||
1469 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1470 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1471 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1472 }
1473
1474 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1475 InnerClassesIterator iter(k);
1476
1477 if (iter.length() == 0) {
1478 // Neither an inner nor outer class
1479 oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1480 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1481 }
1482
1483 // find inner class info
1484 constantPoolHandle cp(thread, k->constants());
1485 int length = iter.length();
1486
1487 // Allocate temp. result array
1488 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL);
1489 refArrayHandle result(THREAD, r);
1490 int members = 0;
1491
1492 for (; !iter.done(); iter.next()) {
1493 int ioff = iter.inner_class_info_index();
1494 int ooff = iter.outer_class_info_index();
1495
1496 if (ioff != 0 && ooff != 0) {
1497 // Check to see if the name matches the class we're looking for
1498 // before attempting to find the class.
1499 if (cp->klass_name_at_matches(k, ooff)) {
1500 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1501 if (outer_klass == k) {
1502 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1503 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1504
1505 // Throws an exception if outer klass has not declared k as
1506 // an inner klass
1507 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1508
1509 result->obj_at_put(members, inner_klass->java_mirror());
1510 members++;
1511 }
1512 }
1513 }
1514 }
1515
1516 if (members != length) {
1517 // Return array of right length
1518 refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL);
1519 for(int i = 0; i < members; i++) {
1520 res->obj_at_put(i, result->obj_at(i));
1521 }
1522 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1523 }
1524
1525 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1526 JVM_END
1527
1528
1529 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1530 {
1531 // ofClass is a reference to a java_lang_Class object.
1532 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1533 if (java_lang_Class::is_primitive(ofMirror)) {
1534 return nullptr;
1535 }
1536 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1537 if (!klass->is_instance_klass()) {
1538 return nullptr;
1539 }
1540
1541 bool inner_is_member = false;
1542 Klass* outer_klass
1543 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1544 if (outer_klass == nullptr) return nullptr; // already a top-level class
1545 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1546 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1547 }
1548 JVM_END
1549
1550 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1551 {
1552 oop mirror = JNIHandles::resolve_non_null(cls);
1553 if (java_lang_Class::is_primitive(mirror)) {
1554 return nullptr;
1555 }
1556 Klass* klass = java_lang_Class::as_Klass(mirror);
1557 if (!klass->is_instance_klass()) {
1558 return nullptr;
1559 }
1560 InstanceKlass* k = InstanceKlass::cast(klass);
1561 int ooff = 0, noff = 0;
1562 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1563 if (noff != 0) {
1564 constantPoolHandle i_cp(thread, k->constants());
1565 Symbol* name = i_cp->symbol_at(noff);
1566 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1567 return (jstring) JNIHandles::make_local(THREAD, str());
1568 }
1569 }
1570 return nullptr;
1571 }
1572 JVM_END
1573
1574 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1575 assert (cls != nullptr, "illegal class");
1576 JvmtiVMObjectAllocEventCollector oam;
1577 ResourceMark rm(THREAD);
1578 oop mirror = JNIHandles::resolve_non_null(cls);
1579 // Return null for arrays and primitives
1580 if (!java_lang_Class::is_primitive(mirror)) {
1581 Klass* k = java_lang_Class::as_Klass(mirror);
1582 if (k->is_instance_klass()) {
1583 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1584 if (sym == nullptr) return nullptr;
1585 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1586 return (jstring) JNIHandles::make_local(THREAD, str());
1587 }
1588 }
1589 return nullptr;
1590 JVM_END
1591
1592
1593 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1594 assert (cls != nullptr, "illegal class");
1595 oop mirror = JNIHandles::resolve_non_null(cls);
1596 // Return null for arrays and primitives
1597 if (!java_lang_Class::is_primitive(mirror)) {
1598 Klass* k = java_lang_Class::as_Klass(mirror);
1599 if (k->is_instance_klass()) {
1600 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1601 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1602 }
1603 }
1604 return nullptr;
1605 JVM_END
1606
1607
1608 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1609 // some of this code was adapted from from jni_FromReflectedField
1610
1611 oop reflected = JNIHandles::resolve_non_null(field);
1612 oop mirror = java_lang_reflect_Field::clazz(reflected);
1613 int slot = java_lang_reflect_Field::slot(reflected);
1614 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1615
1616 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1617 int offset = ik->field_offset(slot);
1618
1619 if (modifiers & JVM_ACC_STATIC) {
1620 // for static fields we only look in the current class
1621 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1622 assert(false, "cannot find static field");
1623 return false;
1624 }
1625 } else {
1626 // for instance fields we start with the current class and work
1627 // our way up through the superclass chain
1628 if (!ik->find_field_from_offset(offset, false, &fd)) {
1629 assert(false, "cannot find instance field");
1630 return false;
1631 }
1632 }
1633 return true;
1634 }
1635
1636 static Method* jvm_get_method_common(jobject method) {
1637 // some of this code was adapted from from jni_FromReflectedMethod
1638
1639 oop reflected = JNIHandles::resolve_non_null(method);
1640 oop mirror = nullptr;
1641 int slot = 0;
1642
1643 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1644 mirror = java_lang_reflect_Constructor::clazz(reflected);
1645 slot = java_lang_reflect_Constructor::slot(reflected);
1646 } else {
1647 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1648 "wrong type");
1649 mirror = java_lang_reflect_Method::clazz(reflected);
1650 slot = java_lang_reflect_Method::slot(reflected);
1651 }
1652 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1653
1654 Method* m = ik->method_with_idnum(slot);
1655 assert(m != nullptr, "cannot find method");
1656 return m; // caller has to deal with null in product mode
1657 }
1658
1659 /* Type use annotations support (JDK 1.8) */
1660
1661 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1662 assert (cls != nullptr, "illegal class");
1663 ResourceMark rm(THREAD);
1664 // Return null for arrays and primitives
1665 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1667 if (k->is_instance_klass()) {
1668 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1669 if (type_annotations != nullptr) {
1670 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1671 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1672 }
1673 }
1674 }
1675 return nullptr;
1676 JVM_END
1677
1678 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1679 assert (method != nullptr, "illegal method");
1680 // method is a handle to a java.lang.reflect.Method object
1681 Method* m = jvm_get_method_common(method);
1682 if (m == nullptr) {
1683 return nullptr;
1684 }
1685
1686 AnnotationArray* type_annotations = m->type_annotations();
1687 if (type_annotations != nullptr) {
1688 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1689 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1690 }
1691
1692 return nullptr;
1693 JVM_END
1694
1695 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1696 assert (field != nullptr, "illegal field");
1697 fieldDescriptor fd;
1698 bool gotFd = jvm_get_field_common(field, fd);
1699 if (!gotFd) {
1700 return nullptr;
1701 }
1702
1703 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1704 JVM_END
1705
1706 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1707 if (!cp->is_within_bounds(index)) {
1708 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1709 }
1710 }
1711
1712 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1713 {
1714 // method is a handle to a java.lang.reflect.Method object
1715 Method* method_ptr = jvm_get_method_common(method);
1716 methodHandle mh (THREAD, method_ptr);
1717 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1718 const int num_params = mh->method_parameters_length();
1719
1720 if (num_params < 0) {
1721 // A -1 return value from method_parameters_length means there is no
1722 // parameter data. Return null to indicate this to the reflection
1723 // API.
1724 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1725 return (jobjectArray)nullptr;
1726 } else {
1727 // Otherwise, we return something up to reflection, even if it is
1728 // a zero-length array. Why? Because in some cases this can
1729 // trigger a MalformedParametersException.
1730
1731 // make sure all the symbols are properly formatted
1732 for (int i = 0; i < num_params; i++) {
1733 MethodParametersElement* params = mh->method_parameters_start();
1734 int index = params[i].name_cp_index;
1735 constantPoolHandle cp(THREAD, mh->constants());
1736 bounds_check(cp, index, CHECK_NULL);
1737
1738 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1739 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1740 "Wrong type at constant pool index");
1741 }
1742
1743 }
1744
1745 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1746 objArrayHandle result (THREAD, result_oop);
1747
1748 for (int i = 0; i < num_params; i++) {
1749 MethodParametersElement* params = mh->method_parameters_start();
1750 // For a 0 index, give a null symbol
1751 Symbol* sym = 0 != params[i].name_cp_index ?
1752 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1753 int flags = params[i].flags;
1754 oop param = Reflection::new_parameter(reflected_method, i, sym,
1755 flags, CHECK_NULL);
1756 result->obj_at_put(i, param);
1757 }
1758 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1759 }
1760 }
1761 JVM_END
1762
1763 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1764
1765 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1766 {
1767 JvmtiVMObjectAllocEventCollector oam;
1768
1769 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1770 // Exclude primitive types and array types
1771 if (java_lang_Class::is_primitive(ofMirror) ||
1772 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1773 // Return empty array
1774 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1775 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1776 }
1777
1778 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1779 constantPoolHandle cp(THREAD, k->constants());
1780
1781 // Ensure class is linked
1782 k->link_class(CHECK_NULL);
1783
1784 // Allocate result
1785 int num_fields;
1786
1787 if (publicOnly) {
1788 num_fields = 0;
1789 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1790 if (fs.access_flags().is_public()) ++num_fields;
1791 }
1792 } else {
1793 num_fields = k->java_fields_count();
1794 }
1795
1796 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1797 objArrayHandle result (THREAD, r);
1798
1799 int out_idx = 0;
1800 fieldDescriptor fd;
1801 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1802 if (!publicOnly || fs.access_flags().is_public()) {
1803 fd.reinitialize(k, fs.to_FieldInfo());
1804 oop field = Reflection::new_field(&fd, CHECK_NULL);
1805 result->obj_at_put(out_idx, field);
1806 ++out_idx;
1807 }
1808 }
1809 assert(out_idx == num_fields, "just checking");
1810 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1811 }
1812 JVM_END
1813
1814 // A class is a record if and only if it is final and a direct subclass of
1815 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1816 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1817 {
1818 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1819 if (k != nullptr && k->is_instance_klass()) {
1820 InstanceKlass* ik = InstanceKlass::cast(k);
1821 return ik->is_record();
1822 } else {
1823 return false;
1824 }
1825 }
1826 JVM_END
1827
1828 // Returns an array containing the components of the Record attribute,
1829 // or null if the attribute is not present.
1830 //
1831 // Note that this function returns the components of the Record attribute
1832 // even if the class is not a record.
1833 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1834 {
1835 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1836
1837 Array<RecordComponent*>* components = ik->record_components();
1838 if (components != nullptr) {
1839 JvmtiVMObjectAllocEventCollector oam;
1840 constantPoolHandle cp(THREAD, ik->constants());
1841 int length = components->length();
1842 assert(length >= 0, "unexpected record_components length");
1843 objArrayOop record_components =
1844 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1845 objArrayHandle components_h (THREAD, record_components);
1846
1847 for (int x = 0; x < length; x++) {
1848 RecordComponent* component = components->at(x);
1849 assert(component != nullptr, "unexpected null record component");
1850 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1851 components_h->obj_at_put(x, component_oop);
1852 }
1853 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1854 }
1855
1856 return nullptr;
1857 }
1858 JVM_END
1859
1860 static jobjectArray get_class_declared_methods_helper(
1861 JNIEnv *env,
1862 jclass ofClass, jboolean publicOnly,
1863 bool want_constructor,
1864 Klass* klass, TRAPS) {
1865
1866 JvmtiVMObjectAllocEventCollector oam;
1867
1868 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1869 // Exclude primitive types and array types
1870 if (java_lang_Class::is_primitive(ofMirror)
1871 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1872 // Return empty array
1873 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1874 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1875 }
1876
1877 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1878
1879 // Ensure class is linked
1880 k->link_class(CHECK_NULL);
1881
1882 Array<Method*>* methods = k->methods();
1883 int methods_length = methods->length();
1884
1885 // Save original method_idnum in case of redefinition, which can change
1886 // the idnum of obsolete methods. The new method will have the same idnum
1887 // but if we refresh the methods array, the counts will be wrong.
1888 ResourceMark rm(THREAD);
1889 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1890 int num_methods = 0;
1891
1892 // Select methods matching the criteria.
1893 for (int i = 0; i < methods_length; i++) {
1894 Method* method = methods->at(i);
1895 if (want_constructor && !method->is_object_constructor()) {
1896 continue;
1897 }
1898 if (!want_constructor &&
1899 (method->is_object_constructor() || method->is_class_initializer() ||
1900 method->is_overpass())) {
1901 continue;
1902 }
1903 if (publicOnly && !method->is_public()) {
1904 continue;
1905 }
1906 idnums->push(method->method_idnum());
1907 ++num_methods;
1908 }
1909
1910 // Allocate result
1911 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1912 objArrayHandle result (THREAD, r);
1913
1914 // Now just put the methods that we selected above, but go by their idnum
1915 // in case of redefinition. The methods can be redefined at any safepoint,
1916 // so above when allocating the oop array and below when creating reflect
1917 // objects.
1918 for (int i = 0; i < num_methods; i++) {
1919 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1920 if (method.is_null()) {
1921 // Method may have been deleted and seems this API can handle null
1922 // Otherwise should probably put a method that throws NSME
1923 result->obj_at_put(i, nullptr);
1924 } else {
1925 oop m;
1926 if (want_constructor) {
1927 assert(method->is_object_constructor(), "must be");
1928 m = Reflection::new_constructor(method, CHECK_NULL);
1929 } else {
1930 m = Reflection::new_method(method, false, CHECK_NULL);
1931 }
1932 result->obj_at_put(i, m);
1933 }
1934 }
1935
1936 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1937 }
1938
1939 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1940 {
1941 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1942 /*want_constructor*/ false,
1943 vmClasses::reflect_Method_klass(), THREAD);
1944 }
1945 JVM_END
1946
1947 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1948 {
1949 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1950 /*want_constructor*/ true,
1951 vmClasses::reflect_Constructor_klass(), THREAD);
1952 }
1953 JVM_END
1954
1955 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1956 {
1957 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1958 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1959 return c->has_nestmate_access_to(m, THREAD);
1960 }
1961 JVM_END
1962
1963 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1964 {
1965 // current is not a primitive or array class
1966 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1967 InstanceKlass* host = c->nest_host(THREAD);
1968 return (jclass) (host == nullptr ? nullptr :
1969 JNIHandles::make_local(THREAD, host->java_mirror()));
1970 }
1971 JVM_END
1972
1973 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1974 {
1975 // current is not a primitive or array class
1976 ResourceMark rm(THREAD);
1977 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1978 InstanceKlass* host = c->nest_host(THREAD);
1979
1980 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1981 c->external_name(), host->external_name());
1982 {
1983 JvmtiVMObjectAllocEventCollector oam;
1984 Array<u2>* members = host->nest_members();
1985 int length = members == nullptr ? 0 : members->length();
1986
1987 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1988
1989 // nest host is first in the array so make it one bigger
1990 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL);
1991 refArrayHandle result(THREAD, r);
1992 result->obj_at_put(0, host->java_mirror());
1993 if (length != 0) {
1994 int count = 0;
1995 for (int i = 0; i < length; i++) {
1996 int cp_index = members->at(i);
1997 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1998 if (HAS_PENDING_EXCEPTION) {
1999 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2000 return nullptr; // propagate VMEs
2001 }
2002 if (log_is_enabled(Trace, class, nestmates)) {
2003 stringStream ss;
2004 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2005 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2006 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2007 log_trace(class, nestmates)("%s", ss.as_string());
2008 }
2009 CLEAR_PENDING_EXCEPTION;
2010 continue;
2011 }
2012 if (k->is_instance_klass()) {
2013 InstanceKlass* ik = InstanceKlass::cast(k);
2014 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2015 if (nest_host_k == host) {
2016 result->obj_at_put(count+1, k->java_mirror());
2017 count++;
2018 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2019 } else {
2020 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2021 ik->external_name(), nest_host_k->external_name());
2022 }
2023 } else {
2024 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2025 k->external_name());
2026 }
2027 }
2028 if (count < length) {
2029 // we had invalid entries so we need to compact the array
2030 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2031 length + 1, count + 1);
2032
2033 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2034 count + 1, CHECK_NULL);
2035 objArrayHandle result2(THREAD, r2);
2036 for (int i = 0; i < count + 1; i++) {
2037 result2->obj_at_put(i, result->obj_at(i));
2038 }
2039 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2040 }
2041 }
2042 else {
2043 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2044 }
2045 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2046 }
2047 }
2048 JVM_END
2049
2050 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2051 {
2052 oop mirror = JNIHandles::resolve_non_null(current);
2053 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2054 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2055
2056 ResourceMark rm(THREAD);
2057 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2058 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2059 if (ik->is_sealed()) {
2060 JvmtiVMObjectAllocEventCollector oam;
2061 Array<u2>* subclasses = ik->permitted_subclasses();
2062 int length = subclasses->length();
2063
2064 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2065
2066 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL);
2067 refArrayHandle result(THREAD, r);
2068 int count = 0;
2069 for (int i = 0; i < length; i++) {
2070 int cp_index = subclasses->at(i);
2071 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2072 if (HAS_PENDING_EXCEPTION) {
2073 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2074 return nullptr; // propagate VMEs
2075 }
2076 if (log_is_enabled(Trace, class, sealed)) {
2077 stringStream ss;
2078 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2079 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2080 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2081 log_trace(class, sealed)("%s", ss.as_string());
2082 }
2083
2084 CLEAR_PENDING_EXCEPTION;
2085 continue;
2086 }
2087 if (k->is_instance_klass()) {
2088 result->obj_at_put(count++, k->java_mirror());
2089 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2090 }
2091 }
2092 if (count < length) {
2093 // we had invalid entries so we need to compact the array
2094 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2095 count, CHECK_NULL);
2096 objArrayHandle result2(THREAD, r2);
2097 for (int i = 0; i < count; i++) {
2098 result2->obj_at_put(i, result->obj_at(i));
2099 }
2100 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2101 }
2102 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2103 } else {
2104 return nullptr;
2105 }
2106 }
2107 JVM_END
2108
2109 // Constant pool access //////////////////////////////////////////////////////////
2110
2111 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2112 {
2113 JvmtiVMObjectAllocEventCollector oam;
2114 oop mirror = JNIHandles::resolve_non_null(cls);
2115 // Return null for primitives and arrays
2116 if (!java_lang_Class::is_primitive(mirror)) {
2117 Klass* k = java_lang_Class::as_Klass(mirror);
2118 if (k->is_instance_klass()) {
2119 InstanceKlass* k_h = InstanceKlass::cast(k);
2120 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2121 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2122 return JNIHandles::make_local(THREAD, jcp());
2123 }
2124 }
2125 return nullptr;
2126 }
2127 JVM_END
2128
2129
2130 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2131 {
2132 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2133 return cp->length();
2134 }
2135 JVM_END
2136
2137
2138 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2139 {
2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141 bounds_check(cp, index, CHECK_NULL);
2142 constantTag tag = cp->tag_at(index);
2143 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2144 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145 }
2146 Klass* k = cp->klass_at(index, CHECK_NULL);
2147 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2148 }
2149 JVM_END
2150
2151 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2152 {
2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154 bounds_check(cp, index, CHECK_NULL);
2155 constantTag tag = cp->tag_at(index);
2156 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2157 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158 }
2159 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2160 if (k == nullptr) return nullptr;
2161 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2162 }
2163 JVM_END
2164
2165 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2166 constantTag tag = cp->tag_at(index);
2167 if (!tag.is_method() && !tag.is_interface_method()) {
2168 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2169 }
2170 int klass_ref = cp->uncached_klass_ref_index_at(index);
2171 Klass* k_o;
2172 if (force_resolution) {
2173 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2174 } else {
2175 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2176 if (k_o == nullptr) return nullptr;
2177 }
2178 InstanceKlass* k = InstanceKlass::cast(k_o);
2179 Symbol* name = cp->uncached_name_ref_at(index);
2180 Symbol* sig = cp->uncached_signature_ref_at(index);
2181 methodHandle m (THREAD, k->find_method(name, sig));
2182 if (m.is_null()) {
2183 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2184 }
2185 oop method;
2186 if (m->is_object_constructor()) {
2187 method = Reflection::new_constructor(m, CHECK_NULL);
2188 } else {
2189 method = Reflection::new_method(m, true, CHECK_NULL);
2190 }
2191 return JNIHandles::make_local(THREAD, method);
2192 }
2193
2194 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2195 {
2196 JvmtiVMObjectAllocEventCollector oam;
2197 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2198 bounds_check(cp, index, CHECK_NULL);
2199 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2200 return res;
2201 }
2202 JVM_END
2203
2204 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2205 {
2206 JvmtiVMObjectAllocEventCollector oam;
2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2208 bounds_check(cp, index, CHECK_NULL);
2209 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2210 return res;
2211 }
2212 JVM_END
2213
2214 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2215 constantTag tag = cp->tag_at(index);
2216 if (!tag.is_field()) {
2217 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2218 }
2219 int klass_ref = cp->uncached_klass_ref_index_at(index);
2220 Klass* k_o;
2221 if (force_resolution) {
2222 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2223 } else {
2224 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2225 if (k_o == nullptr) return nullptr;
2226 }
2227 InstanceKlass* k = InstanceKlass::cast(k_o);
2228 Symbol* name = cp->uncached_name_ref_at(index);
2229 Symbol* sig = cp->uncached_signature_ref_at(index);
2230 fieldDescriptor fd;
2231 Klass* target_klass = k->find_field(name, sig, &fd);
2232 if (target_klass == nullptr) {
2233 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2234 }
2235 oop field = Reflection::new_field(&fd, CHECK_NULL);
2236 return JNIHandles::make_local(THREAD, field);
2237 }
2238
2239 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2240 {
2241 JvmtiVMObjectAllocEventCollector oam;
2242 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2243 bounds_check(cp, index, CHECK_NULL);
2244 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2245 return res;
2246 }
2247 JVM_END
2248
2249 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2250 {
2251 JvmtiVMObjectAllocEventCollector oam;
2252 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2253 bounds_check(cp, index, CHECK_NULL);
2254 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2255 return res;
2256 }
2257 JVM_END
2258
2259 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2260 {
2261 JvmtiVMObjectAllocEventCollector oam;
2262 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2263 bounds_check(cp, index, CHECK_NULL);
2264 constantTag tag = cp->tag_at(index);
2265 if (!tag.is_field_or_method()) {
2266 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2267 }
2268 int klass_ref = cp->uncached_klass_ref_index_at(index);
2269 Symbol* klass_name = cp->klass_name_at(klass_ref);
2270 Symbol* member_name = cp->uncached_name_ref_at(index);
2271 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2272 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2273 objArrayHandle dest(THREAD, dest_o);
2274 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2275 dest->obj_at_put(0, str());
2276 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2277 dest->obj_at_put(1, str());
2278 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2279 dest->obj_at_put(2, str());
2280 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2281 }
2282 JVM_END
2283
2284 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2285 {
2286 JvmtiVMObjectAllocEventCollector oam;
2287 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2288 bounds_check(cp, index, CHECK_0);
2289 constantTag tag = cp->tag_at(index);
2290 if (!tag.is_field_or_method()) {
2291 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2292 }
2293 return (jint) cp->uncached_klass_ref_index_at(index);
2294 }
2295 JVM_END
2296
2297 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2298 {
2299 JvmtiVMObjectAllocEventCollector oam;
2300 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2301 bounds_check(cp, index, CHECK_0);
2302 constantTag tag = cp->tag_at(index);
2303 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2304 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2305 }
2306 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2307 }
2308 JVM_END
2309
2310 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2311 {
2312 JvmtiVMObjectAllocEventCollector oam;
2313 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2314 bounds_check(cp, index, CHECK_NULL);
2315 constantTag tag = cp->tag_at(index);
2316 if (!tag.is_name_and_type()) {
2317 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2318 }
2319 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2320 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2321 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2322 objArrayHandle dest(THREAD, dest_o);
2323 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2324 dest->obj_at_put(0, str());
2325 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2326 dest->obj_at_put(1, str());
2327 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2328 }
2329 JVM_END
2330
2331 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2332 {
2333 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2334 bounds_check(cp, index, CHECK_0);
2335 constantTag tag = cp->tag_at(index);
2336 if (!tag.is_int()) {
2337 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2338 }
2339 return cp->int_at(index);
2340 }
2341 JVM_END
2342
2343 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2344 {
2345 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2346 bounds_check(cp, index, CHECK_(0L));
2347 constantTag tag = cp->tag_at(index);
2348 if (!tag.is_long()) {
2349 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2350 }
2351 return cp->long_at(index);
2352 }
2353 JVM_END
2354
2355 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2356 {
2357 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2358 bounds_check(cp, index, CHECK_(0.0f));
2359 constantTag tag = cp->tag_at(index);
2360 if (!tag.is_float()) {
2361 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2362 }
2363 return cp->float_at(index);
2364 }
2365 JVM_END
2366
2367 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2368 {
2369 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2370 bounds_check(cp, index, CHECK_(0.0));
2371 constantTag tag = cp->tag_at(index);
2372 if (!tag.is_double()) {
2373 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2374 }
2375 return cp->double_at(index);
2376 }
2377 JVM_END
2378
2379 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2380 {
2381 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2382 bounds_check(cp, index, CHECK_NULL);
2383 constantTag tag = cp->tag_at(index);
2384 if (!tag.is_string()) {
2385 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2386 }
2387 oop str = cp->string_at(index, CHECK_NULL);
2388 return (jstring) JNIHandles::make_local(THREAD, str);
2389 }
2390 JVM_END
2391
2392 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2393 {
2394 JvmtiVMObjectAllocEventCollector oam;
2395 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2396 bounds_check(cp, index, CHECK_NULL);
2397 constantTag tag = cp->tag_at(index);
2398 if (!tag.is_symbol()) {
2399 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2400 }
2401 Symbol* sym = cp->symbol_at(index);
2402 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2403 return (jstring) JNIHandles::make_local(THREAD, str());
2404 }
2405 JVM_END
2406
2407 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2408 {
2409 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2410 bounds_check(cp, index, CHECK_0);
2411 constantTag tag = cp->tag_at(index);
2412 jbyte result = tag.value();
2413 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2414 // they are changed to the corresponding tags from the JVM spec, so that java code in
2415 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2416 if (tag.is_klass_or_reference()) {
2417 result = JVM_CONSTANT_Class;
2418 } else if (tag.is_string_index()) {
2419 result = JVM_CONSTANT_String;
2420 } else if (tag.is_method_type_in_error()) {
2421 result = JVM_CONSTANT_MethodType;
2422 } else if (tag.is_method_handle_in_error()) {
2423 result = JVM_CONSTANT_MethodHandle;
2424 } else if (tag.is_dynamic_constant_in_error()) {
2425 result = JVM_CONSTANT_Dynamic;
2426 }
2427 return result;
2428 }
2429 JVM_END
2430
2431 // Assertion support. //////////////////////////////////////////////////////////
2432
2433 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2434 assert(cls != nullptr, "bad class");
2435
2436 oop r = JNIHandles::resolve(cls);
2437 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2438 if (java_lang_Class::is_primitive(r)) return false;
2439
2440 Klass* k = java_lang_Class::as_Klass(r);
2441 assert(k->is_instance_klass(), "must be an instance klass");
2442 if (!k->is_instance_klass()) return false;
2443
2444 ResourceMark rm(THREAD);
2445 const char* name = k->name()->as_C_string();
2446 bool system_class = k->class_loader() == nullptr;
2447 return JavaAssertions::enabled(name, system_class);
2448
2449 JVM_END
2450
2451
2452 // Return a new AssertionStatusDirectives object with the fields filled in with
2453 // command-line assertion arguments (i.e., -ea, -da).
2454 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2455 JvmtiVMObjectAllocEventCollector oam;
2456 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2457 return JNIHandles::make_local(THREAD, asd);
2458 JVM_END
2459
2460 // Verification ////////////////////////////////////////////////////////////////////////////////
2461
2462 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2463
2464 // RedefineClasses support: bug 6214132 caused verification to fail.
2465 // All functions from this section, unless noted otherwise, should call the functions
2466 // get_klass_considering_redefinition(), or
2467 // get_instance_klass_considering_redefinition()
2468 // These functions return JvmtiThreadState::_scratch_class if the verifier
2469 // was invoked in the middle of the redefinition of cls.
2470 // See jvmtiThreadState.hpp for details.
2471
2472 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2474 if (k->is_instance_klass()) {
2475 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2476 } else {
2477 return k;
2478 }
2479 }
2480
2481 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2482 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2483 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2484 }
2485
2486 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2487 oop mirror = JNIHandles::resolve_non_null(cls);
2488 if (java_lang_Class::is_primitive(mirror)) {
2489 return JNI_FALSE;
2490 }
2491 Klass* k = java_lang_Class::as_Klass(mirror);
2492 // This isn't necessary since answer is the same because redefinition
2493 // has already checked this matches for the scratch class.
2494 // k = get_klass_considering_redefinition(cls, thread)
2495 jboolean result = k->is_interface();
2496 assert(!result || k->is_instance_klass(),
2497 "all interfaces are instance types");
2498 return result;
2499 JVM_END
2500
2501 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2502 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2504 return k->name()->as_utf8();
2505 JVM_END
2506
2507
2508 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2509 Klass* k = get_klass_considering_redefinition(cls, thread);
2510 // types will have length zero if this is not an InstanceKlass
2511 // (length is determined by call to JVM_GetClassCPEntriesCount)
2512 if (k->is_instance_klass()) {
2513 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2514 for (int index = cp->length() - 1; index >= 0; index--) {
2515 constantTag tag = cp->tag_at(index);
2516 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2517 }
2518 }
2519 JVM_END
2520
2521
2522 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2523 Klass* k = get_klass_considering_redefinition(cls, thread);
2524 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2525 JVM_END
2526
2527
2528 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2529 Klass* k = get_klass_considering_redefinition(cls, thread);
2530 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2531 JVM_END
2532
2533
2534 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2535 Klass* k = get_klass_considering_redefinition(cls, thread);
2536 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2537 JVM_END
2538
2539
2540 // The following methods, used for the verifier, are never called with
2541 // array klasses, so a direct cast to InstanceKlass is safe.
2542 // Typically, these methods are called in a loop with bounds determined
2543 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2544 // zero for arrays.
2545 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2546 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2547 Method* method = ik->methods()->at(method_index);
2548 int length = method->checked_exceptions_length();
2549 if (length > 0) {
2550 CheckedExceptionElement* table= method->checked_exceptions_start();
2551 for (int i = 0; i < length; i++) {
2552 exceptions[i] = table[i].class_cp_index;
2553 }
2554 }
2555 JVM_END
2556
2557
2558 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2559 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2560 Method* method = ik->methods()->at(method_index);
2561 return method->checked_exceptions_length();
2562 JVM_END
2563
2564
2565 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2566 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2567 Method* method = ik->methods()->at(method_index);
2568 memcpy(code, method->code_base(), method->code_size());
2569 JVM_END
2570
2571
2572 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2573 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2574 Method* method = ik->methods()->at(method_index);
2575 return method->code_size();
2576 JVM_END
2577
2578
2579 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2580 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2581 Method* method = ik->methods()->at(method_index);
2582 ExceptionTable extable(method);
2583 entry->start_pc = extable.start_pc(entry_index);
2584 entry->end_pc = extable.end_pc(entry_index);
2585 entry->handler_pc = extable.handler_pc(entry_index);
2586 entry->catchType = extable.catch_type_index(entry_index);
2587 JVM_END
2588
2589
2590 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2591 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2592 Method* method = ik->methods()->at(method_index);
2593 return method->exception_table_length();
2594 JVM_END
2595
2596
2597 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2598 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2599 Method* method = ik->methods()->at(method_index);
2600 return method->access_flags().as_method_flags();
2601 JVM_END
2602
2603
2604 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2605 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2606 return ik->field_access_flags(field_index);
2607 JVM_END
2608
2609
2610 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2611 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2612 Method* method = ik->methods()->at(method_index);
2613 return method->max_locals();
2614 JVM_END
2615
2616
2617 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2618 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2619 Method* method = ik->methods()->at(method_index);
2620 return method->size_of_parameters();
2621 JVM_END
2622
2623
2624 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2625 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2626 Method* method = ik->methods()->at(method_index);
2627 return method->verifier_max_stack();
2628 JVM_END
2629
2630
2631 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2632 ResourceMark rm(THREAD);
2633 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2634 Method* method = ik->methods()->at(method_index);
2635 return method->is_object_constructor();
2636 JVM_END
2637
2638
2639 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2640 ResourceMark rm(THREAD);
2641 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2642 Method* method = ik->methods()->at(method_index);
2643 return method->is_overpass();
2644 JVM_END
2645
2646 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2647 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2648 Method* method = ik->methods()->at(method_index);
2649 return method->name()->as_utf8();
2650 JVM_END
2651
2652
2653 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2654 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2655 Method* method = ik->methods()->at(method_index);
2656 return method->signature()->as_utf8();
2657 JVM_END
2658
2659 /**
2660 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2661 * read entries in the constant pool. Since the old verifier always
2662 * works on a copy of the code, it will not see any rewriting that
2663 * may possibly occur in the middle of verification. So it is important
2664 * that nothing it calls tries to use the cpCache instead of the raw
2665 * constant pool, so we must use cp->uncached_x methods when appropriate.
2666 */
2667 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2668 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2669 ConstantPool* cp = ik->constants();
2670 switch (cp->tag_at(cp_index).value()) {
2671 case JVM_CONSTANT_Fieldref:
2672 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2673 default:
2674 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2675 }
2676 ShouldNotReachHere();
2677 return nullptr;
2678 JVM_END
2679
2680
2681 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2682 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2683 ConstantPool* cp = ik->constants();
2684 switch (cp->tag_at(cp_index).value()) {
2685 case JVM_CONSTANT_InterfaceMethodref:
2686 case JVM_CONSTANT_Methodref:
2687 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2688 default:
2689 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2690 }
2691 ShouldNotReachHere();
2692 return nullptr;
2693 JVM_END
2694
2695
2696 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2697 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2698 ConstantPool* cp = ik->constants();
2699 switch (cp->tag_at(cp_index).value()) {
2700 case JVM_CONSTANT_InterfaceMethodref:
2701 case JVM_CONSTANT_Methodref:
2702 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2703 default:
2704 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2705 }
2706 ShouldNotReachHere();
2707 return nullptr;
2708 JVM_END
2709
2710
2711 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2712 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2713 ConstantPool* cp = ik->constants();
2714 switch (cp->tag_at(cp_index).value()) {
2715 case JVM_CONSTANT_Fieldref:
2716 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2717 default:
2718 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2719 }
2720 ShouldNotReachHere();
2721 return nullptr;
2722 JVM_END
2723
2724
2725 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2726 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2727 ConstantPool* cp = ik->constants();
2728 Symbol* classname = cp->klass_name_at(cp_index);
2729 return classname->as_utf8();
2730 JVM_END
2731
2732
2733 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2734 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2735 ConstantPool* cp = ik->constants();
2736 switch (cp->tag_at(cp_index).value()) {
2737 case JVM_CONSTANT_Fieldref: {
2738 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2739 Symbol* classname = cp->klass_name_at(class_index);
2740 return classname->as_utf8();
2741 }
2742 default:
2743 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2744 }
2745 ShouldNotReachHere();
2746 return nullptr;
2747 JVM_END
2748
2749
2750 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2751 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2752 ConstantPool* cp = ik->constants();
2753 switch (cp->tag_at(cp_index).value()) {
2754 case JVM_CONSTANT_Methodref:
2755 case JVM_CONSTANT_InterfaceMethodref: {
2756 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2757 Symbol* classname = cp->klass_name_at(class_index);
2758 return classname->as_utf8();
2759 }
2760 default:
2761 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2762 }
2763 ShouldNotReachHere();
2764 return nullptr;
2765 JVM_END
2766
2767
2768 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2769 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2770 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2771 ConstantPool* cp = ik->constants();
2772 ConstantPool* cp_called = ik_called->constants();
2773 switch (cp->tag_at(cp_index).value()) {
2774 case JVM_CONSTANT_Fieldref: {
2775 Symbol* name = cp->uncached_name_ref_at(cp_index);
2776 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2777 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2778 if (fs.name() == name && fs.signature() == signature) {
2779 return fs.access_flags().as_field_flags();
2780 }
2781 }
2782 return -1;
2783 }
2784 default:
2785 fatal("JVM_GetCPFieldModifiers: illegal constant");
2786 }
2787 ShouldNotReachHere();
2788 return 0;
2789 JVM_END
2790
2791
2792 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2793 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2794 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2795 ConstantPool* cp = ik->constants();
2796 switch (cp->tag_at(cp_index).value()) {
2797 case JVM_CONSTANT_Methodref:
2798 case JVM_CONSTANT_InterfaceMethodref: {
2799 Symbol* name = cp->uncached_name_ref_at(cp_index);
2800 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2801 Array<Method*>* methods = ik_called->methods();
2802 int methods_count = methods->length();
2803 for (int i = 0; i < methods_count; i++) {
2804 Method* method = methods->at(i);
2805 if (method->name() == name && method->signature() == signature) {
2806 return method->access_flags().as_method_flags();
2807 }
2808 }
2809 return -1;
2810 }
2811 default:
2812 fatal("JVM_GetCPMethodModifiers: illegal constant");
2813 }
2814 ShouldNotReachHere();
2815 return 0;
2816 JVM_END
2817
2818
2819 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2820
2821 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2822 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2823 JVM_END
2824
2825
2826 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2827 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2828 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2829 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2830 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2831 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2832 JVM_END
2833
2834 // Printing support //////////////////////////////////////////////////
2835 extern "C" {
2836
2837 ATTRIBUTE_PRINTF(3, 0)
2838 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2839 // Reject count values that are negative signed values converted to
2840 // unsigned; see bug 4399518, 4417214
2841 if ((intptr_t)count <= 0) return -1;
2842
2843 int result = os::vsnprintf(str, count, fmt, args);
2844 if (result > 0 && (size_t)result >= count) {
2845 result = -1;
2846 }
2847
2848 return result;
2849 }
2850
2851 ATTRIBUTE_PRINTF(3, 4)
2852 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2853 va_list args;
2854 int len;
2855 va_start(args, fmt);
2856 len = jio_vsnprintf(str, count, fmt, args);
2857 va_end(args);
2858 return len;
2859 }
2860
2861 ATTRIBUTE_PRINTF(2, 3)
2862 int jio_fprintf(FILE* f, const char *fmt, ...) {
2863 int len;
2864 va_list args;
2865 va_start(args, fmt);
2866 len = jio_vfprintf(f, fmt, args);
2867 va_end(args);
2868 return len;
2869 }
2870
2871 ATTRIBUTE_PRINTF(2, 0)
2872 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2873 if (Arguments::vfprintf_hook() != nullptr) {
2874 return Arguments::vfprintf_hook()(f, fmt, args);
2875 } else {
2876 return vfprintf(f, fmt, args);
2877 }
2878 }
2879
2880 ATTRIBUTE_PRINTF(1, 2)
2881 JNIEXPORT int jio_printf(const char *fmt, ...) {
2882 int len;
2883 va_list args;
2884 va_start(args, fmt);
2885 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2886 va_end(args);
2887 return len;
2888 }
2889
2890 // HotSpot specific jio method
2891 void jio_print(const char* s, size_t len) {
2892 // Try to make this function as atomic as possible.
2893 if (Arguments::vfprintf_hook() != nullptr) {
2894 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2895 } else {
2896 // Make an unused local variable to avoid warning from gcc compiler.
2897 bool dummy = os::write(defaultStream::output_fd(), s, len);
2898 }
2899 }
2900
2901 } // Extern C
2902
2903 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2904
2905 // In most of the JVM thread support functions we need to access the
2906 // thread through a ThreadsListHandle to prevent it from exiting and
2907 // being reclaimed while we try to operate on it. The exceptions to this
2908 // rule are when operating on the current thread, or if the monitor of
2909 // the target java.lang.Thread is locked at the Java level - in both
2910 // cases the target cannot exit.
2911
2912 static void thread_entry(JavaThread* thread, TRAPS) {
2913 HandleMark hm(THREAD);
2914 Handle obj(THREAD, thread->threadObj());
2915 JavaValue result(T_VOID);
2916 JavaCalls::call_virtual(&result,
2917 obj,
2918 vmClasses::Thread_klass(),
2919 vmSymbols::run_method_name(),
2920 vmSymbols::void_method_signature(),
2921 THREAD);
2922 }
2923
2924
2925 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2926 #if INCLUDE_CDS
2927 if (CDSConfig::allow_only_single_java_thread()) {
2928 // During java -Xshare:dump, if we allow multiple Java threads to
2929 // execute in parallel, symbols and classes may be loaded in
2930 // random orders which will make the resulting CDS archive
2931 // non-deterministic.
2932 //
2933 // Lucikly, during java -Xshare:dump, it's important to run only
2934 // the code in the main Java thread (which is NOT started here) that
2935 // creates the module graph, etc. It's safe to not start the other
2936 // threads which are launched by class static initializers
2937 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2938 if (log_is_enabled(Info, aot)) {
2939 ResourceMark rm;
2940 oop t = JNIHandles::resolve_non_null(jthread);
2941 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2942 }
2943 return;
2944 }
2945 #endif
2946 JavaThread *native_thread = nullptr;
2947
2948 // We cannot hold the Threads_lock when we throw an exception,
2949 // due to rank ordering issues. Example: we might need to grab the
2950 // Heap_lock while we construct the exception.
2951 bool throw_illegal_thread_state = false;
2952
2953 // We must release the Threads_lock before we can post a jvmti event
2954 // in Thread::start.
2955 {
2956 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2957 // Ensure that the C++ Thread and OSThread structures aren't freed before
2958 // we operate.
2959 MutexLocker ml(Threads_lock);
2960
2961 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2962 // re-starting an already started thread, so we should usually find
2963 // that the JavaThread is null. However for a JNI attached thread
2964 // there is a small window between the Thread object being created
2965 // (with its JavaThread set) and the update to its threadStatus, so we
2966 // have to check for this
2967 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2968 throw_illegal_thread_state = true;
2969 } else {
2970 jlong size =
2971 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2972 // Allocate the C++ Thread structure and create the native thread. The
2973 // stack size retrieved from java is 64-bit signed, but the constructor takes
2974 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2975 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2976 // - Avoid passing negative values which would result in really large stacks.
2977 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2978 size_t sz = size > 0 ? (size_t) size : 0;
2979 native_thread = new JavaThread(&thread_entry, sz);
2980
2981 // At this point it may be possible that no osthread was created for the
2982 // JavaThread due to lack of memory. Check for this situation and throw
2983 // an exception if necessary. Eventually we may want to change this so
2984 // that we only grab the lock if the thread was created successfully -
2985 // then we can also do this check and throw the exception in the
2986 // JavaThread constructor.
2987 if (native_thread->osthread() != nullptr) {
2988 // Note: the current thread is not being used within "prepare".
2989 native_thread->prepare(jthread);
2990 }
2991 }
2992 }
2993
2994 if (throw_illegal_thread_state) {
2995 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2996 }
2997
2998 assert(native_thread != nullptr, "Starting null thread?");
2999
3000 if (native_thread->osthread() == nullptr) {
3001 ResourceMark rm(thread);
3002 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3003 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3004 // No one should hold a reference to the 'native_thread'.
3005 native_thread->smr_delete();
3006 if (JvmtiExport::should_post_resource_exhausted()) {
3007 JvmtiExport::post_resource_exhausted(
3008 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3009 os::native_thread_creation_failed_msg());
3010 }
3011 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3012 os::native_thread_creation_failed_msg());
3013 }
3014
3015 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3016
3017 Thread::start(native_thread);
3018
3019 JVM_END
3020
3021
3022 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3023 ThreadsListHandle tlh(thread);
3024 oop java_thread = nullptr;
3025 JavaThread* receiver = nullptr;
3026 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3027 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3028
3029 if (is_alive) {
3030 // jthread refers to a live JavaThread.
3031 Thread::set_priority(receiver, (ThreadPriority)prio);
3032 }
3033 // Implied else: If the JavaThread hasn't started yet, then the
3034 // priority set in the java.lang.Thread object above will be pushed
3035 // down when it does start.
3036 JVM_END
3037
3038
3039 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3040 HOTSPOT_THREAD_YIELD();
3041 os::naked_yield();
3042 JVM_END
3043
3044 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3045 if (nanos < 0) {
3046 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3047 }
3048
3049 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3050 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3051 }
3052
3053 // Save current thread state and restore it at the end of this block.
3054 // And set new thread state to SLEEPING.
3055 JavaThreadSleepState jtss(thread);
3056
3057 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3058
3059 if (nanos == 0) {
3060 os::naked_yield();
3061 } else {
3062 ThreadState old_state = thread->osthread()->get_state();
3063 thread->osthread()->set_state(SLEEPING);
3064 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3065 // An asynchronous exception could have been thrown on
3066 // us while we were sleeping. We do not overwrite those.
3067 if (!HAS_PENDING_EXCEPTION) {
3068 HOTSPOT_THREAD_SLEEP_END(1);
3069 if (!thread->has_async_exception_condition()) {
3070 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3071 // to properly restore the thread state. That's likely wrong.
3072 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3073 }
3074 }
3075 }
3076 thread->osthread()->set_state(old_state);
3077 }
3078 HOTSPOT_THREAD_SLEEP_END(0);
3079 JVM_END
3080
3081 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3082 oop jthread = thread->threadObj();
3083 assert(jthread != nullptr, "no current carrier thread!");
3084 return JNIHandles::make_local(THREAD, jthread);
3085 JVM_END
3086
3087 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3088 oop theThread = thread->vthread();
3089 assert(theThread != (oop)nullptr, "no current thread!");
3090 return JNIHandles::make_local(THREAD, theThread);
3091 JVM_END
3092
3093 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3094 jobject theThread))
3095 oop threadObj = JNIHandles::resolve(theThread);
3096 thread->set_vthread(threadObj);
3097
3098 // Set _monitor_owner_id of new current Thread
3099 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3100
3101 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3102 JVM_END
3103
3104 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3105 return ThreadIdentifier::unsafe_offset();
3106 JVM_END
3107
3108 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3109 ThreadsListHandle tlh(thread);
3110 JavaThread* receiver = nullptr;
3111 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3112 if (is_alive) {
3113 // jthread refers to a live JavaThread.
3114 receiver->interrupt();
3115 }
3116 JVM_END
3117
3118 // Return true iff the current thread has locked the object passed in
3119
3120 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3121 if (obj == nullptr) {
3122 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3123 }
3124 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3125 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3126 JVM_END
3127
3128 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3129 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3130 return (jobjectArray) JNIHandles::make_local(THREAD, trace);
3131 JVM_END
3132
3133 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3134 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3135 return JNIHandles::make_local(THREAD, snapshot);
3136 JVM_END
3137
3138 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3139 // We don't use a ThreadsListHandle here because the current thread
3140 // must be alive.
3141 oop java_thread = JNIHandles::resolve_non_null(jthread);
3142 JavaThread* thr = java_lang_Thread::thread(java_thread);
3143 if (thread == thr && !thr->has_attached_via_jni()) {
3144 // Thread naming is only supported for the current thread and
3145 // we don't set the name of an attached thread to avoid stepping
3146 // on other programs.
3147 ResourceMark rm(thread);
3148 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3149 os::set_native_thread_name(thread_name);
3150 }
3151 JVM_END
3152
3153 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3154 oop theCache = thread->scopedValueCache();
3155 return JNIHandles::make_local(THREAD, theCache);
3156 JVM_END
3157
3158 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3159 jobject theCache))
3160 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3161 thread->set_scopedValueCache(objs);
3162 JVM_END
3163
3164
3165 // java.lang.Package ////////////////////////////////////////////////////////////////
3166
3167
3168 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3169 ResourceMark rm(THREAD);
3170 JvmtiVMObjectAllocEventCollector oam;
3171 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3172 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3173 return (jstring) JNIHandles::make_local(THREAD, result);
3174 JVM_END
3175
3176
3177 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3178 JvmtiVMObjectAllocEventCollector oam;
3179 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3180 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3181 JVM_END
3182
3183
3184 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3185
3186
3187 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3188 MonitorLocker ml(Heap_lock);
3189 oop ref = Universe::reference_pending_list();
3190 if (ref != nullptr) {
3191 Universe::clear_reference_pending_list();
3192 }
3193 return JNIHandles::make_local(THREAD, ref);
3194 JVM_END
3195
3196 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3197 MonitorLocker ml(Heap_lock);
3198 return Universe::has_reference_pending_list();
3199 JVM_END
3200
3201 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3202 MonitorLocker ml(Heap_lock);
3203 while (!Universe::has_reference_pending_list()) {
3204 ml.wait();
3205 }
3206 JVM_END
3207
3208 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3209 oop ref_oop = JNIHandles::resolve_non_null(ref);
3210 // PhantomReference has its own implementation of get().
3211 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3212 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3213 return JNIHandles::make_local(THREAD, referent);
3214 JVM_END
3215
3216 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3217 oop ref_oop = JNIHandles::resolve_non_null(ref);
3218 // PhantomReference has its own implementation of refersTo().
3219 // See: JVM_PhantomReferenceRefersTo
3220 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3221 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3222 return referent == JNIHandles::resolve(o);
3223 JVM_END
3224
3225 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3226 oop ref_oop = JNIHandles::resolve_non_null(ref);
3227 // FinalReference has it's own implementation of clear().
3228 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3229 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3230 // If the referent has already been cleared then done.
3231 // However, if the referent is dead but has not yet been cleared by
3232 // concurrent reference processing, it should NOT be cleared here.
3233 // Instead, clearing should be left to the GC. Clearing it here could
3234 // detectably lose an expected notification, which is impossible with
3235 // STW reference processing. The clearing in enqueue() doesn't have
3236 // this problem, since the enqueue covers the notification, but it's not
3237 // worth the effort to handle that case specially.
3238 return;
3239 }
3240 java_lang_ref_Reference::clear_referent(ref_oop);
3241 JVM_END
3242
3243
3244 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3245
3246
3247 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3248 oop ref_oop = JNIHandles::resolve_non_null(ref);
3249 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3250 return referent == JNIHandles::resolve(o);
3251 JVM_END
3252
3253
3254 // ObjectInputStream ///////////////////////////////////////////////////////////////
3255
3256 // Return the first user-defined class loader up the execution stack, or null
3257 // if only code from the bootstrap or platform class loader is on the stack.
3258
3259 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3260 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3261 InstanceKlass* ik = vfst.method()->method_holder();
3262 oop loader = ik->class_loader();
3263 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3264 return JNIHandles::make_local(THREAD, loader);
3265 }
3266 }
3267 return nullptr;
3268 JVM_END
3269
3270
3271 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3272
3273
3274 // resolve array handle and check arguments
3275 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3276 if (arr == nullptr) {
3277 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3278 }
3279 oop a = JNIHandles::resolve_non_null(arr);
3280 if (!a->is_array()) {
3281 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3282 } else if (type_array_only && !a->is_typeArray()) {
3283 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3284 }
3285 return arrayOop(a);
3286 }
3287
3288
3289 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3290 arrayOop a = check_array(env, arr, false, CHECK_0);
3291 return a->length();
3292 JVM_END
3293
3294
3295 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3296 JvmtiVMObjectAllocEventCollector oam;
3297 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3298 jvalue value;
3299 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3300 oop box = Reflection::box(&value, type, CHECK_NULL);
3301 return JNIHandles::make_local(THREAD, box);
3302 JVM_END
3303
3304
3305 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3306 jvalue value;
3307 value.i = 0; // to initialize value before getting used in CHECK
3308 arrayOop a = check_array(env, arr, true, CHECK_(value));
3309 assert(a->is_typeArray(), "just checking");
3310 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3311 BasicType wide_type = (BasicType) wCode;
3312 if (type != wide_type) {
3313 Reflection::widen(&value, type, wide_type, CHECK_(value));
3314 }
3315 return value;
3316 JVM_END
3317
3318
3319 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3320 arrayOop a = check_array(env, arr, false, CHECK);
3321 oop box = JNIHandles::resolve(val);
3322 jvalue value;
3323 value.i = 0; // to initialize value before getting used in CHECK
3324 BasicType value_type;
3325 if (a->is_objArray()) {
3326 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3327 value_type = Reflection::unbox_for_regular_object(box, &value);
3328 } else {
3329 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3330 }
3331 Reflection::array_set(&value, a, index, value_type, CHECK);
3332 JVM_END
3333
3334
3335 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3336 arrayOop a = check_array(env, arr, true, CHECK);
3337 assert(a->is_typeArray(), "just checking");
3338 BasicType value_type = (BasicType) vCode;
3339 Reflection::array_set(&v, a, index, value_type, CHECK);
3340 JVM_END
3341
3342
3343 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3344 JvmtiVMObjectAllocEventCollector oam;
3345 oop element_mirror = JNIHandles::resolve(eltClass);
3346 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3347 return JNIHandles::make_local(THREAD, result);
3348 JVM_END
3349
3350
3351 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3352 JvmtiVMObjectAllocEventCollector oam;
3353 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3354 oop element_mirror = JNIHandles::resolve(eltClass);
3355 assert(dim_array->is_typeArray(), "just checking");
3356 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3357 return JNIHandles::make_local(THREAD, result);
3358 JVM_END
3359
3360
3361 // Library support ///////////////////////////////////////////////////////////////////////////
3362
3363 JVM_LEAF(void*, JVM_LoadZipLibrary())
3364 return ZipLibrary::handle();
3365 JVM_END
3366
3367 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3368 //%note jvm_ct
3369 char ebuf[1024];
3370 void *load_result;
3371 {
3372 ThreadToNativeFromVM ttnfvm(thread);
3373 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3374 }
3375 if (load_result == nullptr) {
3376 if (throwException) {
3377 char msg[1024];
3378 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3379 // Since 'ebuf' may contain a string encoded using
3380 // platform encoding scheme, we need to pass
3381 // Exceptions::unsafe_to_utf8 to the new_exception method
3382 // as the last argument. See bug 6367357.
3383 Handle h_exception =
3384 Exceptions::new_exception(thread,
3385 vmSymbols::java_lang_UnsatisfiedLinkError(),
3386 msg, Exceptions::unsafe_to_utf8);
3387
3388 THROW_HANDLE_NULL(h_exception);
3389 } else {
3390 log_info(library)("Failed to load library %s", name);
3391 return load_result;
3392 }
3393 }
3394 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3395 return load_result;
3396 JVM_END
3397
3398
3399 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3400 os::dll_unload(handle);
3401 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3402 JVM_END
3403
3404
3405 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3406 void* find_result = os::dll_lookup(handle, name);
3407 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3408 find_result != nullptr ? "Found" : "Failed to find",
3409 name, p2i(handle));
3410 return find_result;
3411 JVM_END
3412
3413
3414 // JNI version ///////////////////////////////////////////////////////////////////////////////
3415
3416 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3417 return Threads::is_supported_jni_version_including_1_1(version);
3418 JVM_END
3419
3420
3421 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3422 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3423 JVM_END
3424
3425 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3426 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3427 JVM_END
3428
3429 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3430 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3431 JVM_END
3432
3433 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3434 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3435 JVM_END
3436
3437 // String support ///////////////////////////////////////////////////////////////////////////
3438
3439 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3440 JvmtiVMObjectAllocEventCollector oam;
3441 if (str == nullptr) return nullptr;
3442 oop string = JNIHandles::resolve_non_null(str);
3443 oop result = StringTable::intern(string, CHECK_NULL);
3444 return (jstring) JNIHandles::make_local(THREAD, result);
3445 JVM_END
3446
3447
3448 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3449
3450 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3451 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3452 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3453 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3454 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3455 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3456
3457
3458 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3459 VM_Exit::block_if_vm_exited();
3460 return new PlatformMutex();
3461 }
3462
3463
3464 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3465 VM_Exit::block_if_vm_exited();
3466 delete ((PlatformMutex*) mon);
3467 }
3468
3469
3470 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3471 VM_Exit::block_if_vm_exited();
3472 ((PlatformMutex*) mon)->lock();
3473 return 0;
3474 }
3475
3476
3477 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3478 VM_Exit::block_if_vm_exited();
3479 ((PlatformMutex*) mon)->unlock();
3480 }
3481
3482
3483 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3484
3485 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3486 Handle loader, jboolean throwError, TRAPS) {
3487 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3488
3489 // Check if we should initialize the class
3490 if (init && klass->is_instance_klass()) {
3491 klass->initialize(CHECK_NULL);
3492 }
3493 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3494 }
3495
3496
3497 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3498
3499 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3500 Handle method_handle;
3501 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3502 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3503 Handle receiver(THREAD, JNIHandles::resolve(obj));
3504 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3505 assert(args() == nullptr || !args->is_flatArray(), "args are never flat");
3506
3507 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3508 jobject res = JNIHandles::make_local(THREAD, result);
3509 if (JvmtiExport::should_post_vm_object_alloc()) {
3510 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3511 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3512 if (java_lang_Class::is_primitive(ret_type)) {
3513 // Only for primitive type vm allocates memory for java object.
3514 // See box() method.
3515 JvmtiExport::post_vm_object_alloc(thread, result);
3516 }
3517 }
3518 return res;
3519 } else {
3520 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3521 }
3522 JVM_END
3523
3524
3525 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3526 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3527 assert(args() == nullptr || !args->is_flatArray(), "args are never flat");
3528 oop constructor_mirror = JNIHandles::resolve(c);
3529 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3530 jobject res = JNIHandles::make_local(THREAD, result);
3531 if (JvmtiExport::should_post_vm_object_alloc()) {
3532 JvmtiExport::post_vm_object_alloc(thread, result);
3533 }
3534 return res;
3535 JVM_END
3536
3537 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3538 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3539 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3540 JVM_END
3541
3542 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3543 jclass caller,
3544 jstring interfaceMethodName,
3545 jobject factoryType,
3546 jobject interfaceMethodType,
3547 jobject implementationMember,
3548 jobject dynamicMethodType,
3549 jclass lambdaProxyClass))
3550 #if INCLUDE_CDS
3551 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3552 return;
3553 }
3554
3555 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3556 if (caller_ik->is_hidden()) {
3557 // Hidden classes not of type lambda proxy classes are currently not being archived.
3558 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3559 // registered for archiving.
3560 return;
3561 }
3562 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3563 assert(lambda_ik->is_hidden(), "must be a hidden class");
3564 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3565
3566 Symbol* interface_method_name = nullptr;
3567 if (interfaceMethodName != nullptr) {
3568 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3569 }
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 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3584 interface_method_type, m, dynamic_method_type, THREAD);
3585 #endif // INCLUDE_CDS
3586 JVM_END
3587
3588 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3589 jclass caller,
3590 jstring interfaceMethodName,
3591 jobject factoryType,
3592 jobject interfaceMethodType,
3593 jobject implementationMember,
3594 jobject dynamicMethodType))
3595 #if INCLUDE_CDS
3596
3597 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3598 implementationMember == nullptr || dynamicMethodType == nullptr) {
3599 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3600 }
3601
3602 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3603 if (!caller_ik->in_aot_cache()) {
3604 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3605 return nullptr;
3606 }
3607
3608 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3609 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3610 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3611
3612 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3613 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3614
3615 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3616 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3617 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3618
3619 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3620 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3621
3622 InstanceKlass* loaded_lambda =
3623 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3624 interface_method_type, m, dynamic_method_type,
3625 CHECK_(nullptr));
3626 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3627 #else
3628 return nullptr;
3629 #endif // INCLUDE_CDS
3630 JVM_END
3631
3632 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3633 if (CDSConfig::is_dumping_static_archive()) {
3634 // We do this so that the default CDS archive can be deterministic.
3635 const char* release = VM_Version::vm_release();
3636 const char* dbg_level = VM_Version::jdk_debug_level();
3637 const char* version = VM_Version::internal_vm_info_string();
3638 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3639 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3640 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3641 seed += (jlong)VM_Version::vm_major_version();
3642 seed += (jlong)VM_Version::vm_minor_version();
3643 seed += (jlong)VM_Version::vm_security_version();
3644 seed += (jlong)VM_Version::vm_patch_version();
3645 if (seed == 0) { // don't let this ever be zero.
3646 seed = 0x87654321;
3647 }
3648 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3649 return seed;
3650 } else {
3651 return 0;
3652 }
3653 JVM_END
3654
3655 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3656 return CDSConfig::get_status();
3657 JVM_END
3658
3659 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3660 #if INCLUDE_CDS
3661 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3662 if (line != nullptr) {
3663 ResourceMark rm(THREAD);
3664 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3665 char* c_line = java_lang_String::as_utf8_string(h_line());
3666 if (CDSConfig::is_dumping_dynamic_archive()) {
3667 // Note: LambdaFormInvokers::append take same format which is not
3668 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3669 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3670 }
3671 if (ClassListWriter::is_enabled()) {
3672 ClassListWriter w;
3673 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3674 }
3675 }
3676 #endif // INCLUDE_CDS
3677 JVM_END
3678
3679 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3680 #if INCLUDE_CDS
3681 ResourceMark rm(THREAD);
3682 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3683 char* file_name = java_lang_String::as_utf8_string(file_handle());
3684 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3685 #endif // INCLUDE_CDS
3686 JVM_END
3687
3688 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3689 #if INCLUDE_CDS
3690 ResourceMark rm(THREAD);
3691 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3692 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3693 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3694 #endif // INCLUDE_CDS
3695 JVM_END
3696
3697 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3698 #if INCLUDE_CDS
3699 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3700 if (!k->is_instance_klass()) {
3701 return false;
3702 } else {
3703 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3704 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3705 // This class will be cached in AOT-initialized state. No need for init barriers.
3706 return false;
3707 } else {
3708 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3709 // must emit barriers to ensure class initialization during production run.
3710 ResourceMark rm(THREAD);
3711 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3712 return true;
3713 }
3714 }
3715 #else
3716 return false;
3717 #endif // INCLUDE_CDS
3718 JVM_END
3719
3720 // Returns an array of all live Thread objects (VM internal JavaThreads,
3721 // jvmti agent threads, and JNI attaching threads are skipped)
3722 // See CR 6404306 regarding JNI attaching threads
3723 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3724 ResourceMark rm(THREAD);
3725 ThreadsListEnumerator tle(THREAD, false, false);
3726 JvmtiVMObjectAllocEventCollector oam;
3727
3728 int num_threads = tle.num_threads();
3729 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3730 objArrayHandle threads_ah(THREAD, r);
3731
3732 for (int i = 0; i < num_threads; i++) {
3733 Handle h = tle.get_threadObj(i);
3734 threads_ah->obj_at_put(i, h());
3735 }
3736
3737 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3738 JVM_END
3739
3740
3741 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3742 // Return StackTraceElement[][], each element is the stack trace of a thread in
3743 // the corresponding entry in the given threads array
3744 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3745 JvmtiVMObjectAllocEventCollector oam;
3746
3747 // Check if threads is null
3748 if (threads == nullptr) {
3749 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3750 }
3751
3752 refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads));
3753 refArrayHandle ah(THREAD, a);
3754 int num_threads = ah->length();
3755 // check if threads is non-empty array
3756 if (num_threads == 0) {
3757 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3758 }
3759
3760 // check if threads is not an array of objects of Thread class
3761 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3762 if (k != vmClasses::Thread_klass()) {
3763 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3764 }
3765
3766 ResourceMark rm(THREAD);
3767
3768 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3769 for (int i = 0; i < num_threads; i++) {
3770 oop thread_obj = ah->obj_at(i);
3771 instanceHandle h(THREAD, (instanceOop) thread_obj);
3772 thread_handle_array->append(h);
3773 }
3774
3775 // The JavaThread references in thread_handle_array are validated
3776 // in VM_ThreadDump::doit().
3777 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3778 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3779
3780 JVM_END
3781
3782 // JVM monitoring and management support
3783 JVM_LEAF(void*, JVM_GetManagement(jint version))
3784 return Management::get_jmm_interface(version);
3785 JVM_END
3786
3787 // com.sun.tools.attach.VirtualMachine agent properties support
3788 //
3789 // Initialize the agent properties with the properties maintained in the VM
3790 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3791 ResourceMark rm;
3792
3793 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3794
3795 PUTPROP(props, "sun.java.command", Arguments::java_command());
3796 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3797 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3798 return properties;
3799 JVM_END
3800
3801 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3802 {
3803 JvmtiVMObjectAllocEventCollector oam;
3804
3805 if (ofClass == nullptr) {
3806 return nullptr;
3807 }
3808 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3809 // Special handling for primitive objects
3810 if (java_lang_Class::is_primitive(mirror())) {
3811 return nullptr;
3812 }
3813 Klass* k = java_lang_Class::as_Klass(mirror());
3814 if (!k->is_instance_klass()) {
3815 return nullptr;
3816 }
3817 InstanceKlass* ik = InstanceKlass::cast(k);
3818 int encl_method_class_idx = ik->enclosing_method_class_index();
3819 if (encl_method_class_idx == 0) {
3820 return nullptr;
3821 }
3822 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3823 objArrayHandle dest(THREAD, dest_o);
3824 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3825 dest->obj_at_put(0, enc_k->java_mirror());
3826 int encl_method_method_idx = ik->enclosing_method_method_index();
3827 if (encl_method_method_idx != 0) {
3828 Symbol* sym = ik->constants()->symbol_at(
3829 extract_low_short_from_int(
3830 ik->constants()->name_and_type_at(encl_method_method_idx)));
3831 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3832 dest->obj_at_put(1, str());
3833 sym = ik->constants()->symbol_at(
3834 extract_high_short_from_int(
3835 ik->constants()->name_and_type_at(encl_method_method_idx)));
3836 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3837 dest->obj_at_put(2, str());
3838 }
3839 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3840 }
3841 JVM_END
3842
3843 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3844 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3845 ResourceMark rm(THREAD);
3846
3847 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3848 return nullptr;
3849 }
3850
3851 char** vm_flags = Arguments::jvm_flags_array();
3852 char** vm_args = Arguments::jvm_args_array();
3853 int num_flags = Arguments::num_jvm_flags();
3854 int num_args = Arguments::num_jvm_args();
3855
3856 InstanceKlass* ik = vmClasses::String_klass();
3857 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3858 objArrayHandle result_h(THREAD, r);
3859
3860 int index = 0;
3861 for (int j = 0; j < num_flags; j++, index++) {
3862 stringStream prefixed;
3863 prefixed.print("-XX:%s", vm_flags[j]);
3864 Handle h = java_lang_String::create_from_platform_dependent_str(prefixed.base(), CHECK_NULL);
3865 result_h->obj_at_put(index, h());
3866 }
3867 for (int i = 0; i < num_args; i++, index++) {
3868 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3869 result_h->obj_at_put(index, h());
3870 }
3871 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3872 JVM_END
3873
3874 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3875 return os::get_signal_number(name);
3876 JVM_END
3877
3878 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread))
3879 oop vt = JNIHandles::resolve_external_guard(vthread);
3880 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/);
3881 JVM_END
3882
3883 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread))
3884 oop vt = JNIHandles::resolve_external_guard(vthread);
3885 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/);
3886 JVM_END
3887
3888 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3889 oop vt = JNIHandles::resolve_external_guard(vthread);
3890 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/);
3891 JVM_END
3892
3893 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3894 oop vt = JNIHandles::resolve_external_guard(vthread);
3895 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/);
3896 JVM_END
3897
3898 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3899 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3900 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3901 #if INCLUDE_JVMTI
3902 if (!DoJVMTIVirtualThreadTransitions) {
3903 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3904 return;
3905 }
3906 assert(thread->is_disable_suspend() != (bool)enter,
3907 "nested or unbalanced monitor enter/exit is not allowed");
3908 thread->toggle_is_disable_suspend();
3909 #endif
3910 JVM_END
3911
3912 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3913 #if INCLUDE_JFR
3914 freeze_result result = THREAD->last_freeze_fail_result();
3915 assert(result != freeze_ok, "sanity check");
3916 EventVirtualThreadPinned event(UNTIMED);
3917 event.set_starttime(THREAD->last_freeze_fail_time());
3918 if (event.should_commit()) {
3919 ResourceMark rm(THREAD);
3920 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3921 THREAD->post_vthread_pinned_event(&event, str, result);
3922 }
3923 #endif
3924 JVM_END
3925
3926 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3927 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3928 assert(parkEvent != nullptr, "not initialized");
3929
3930 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3931 oop vthread_head = nullptr;
3932 while (true) {
3933 if (list_head.peek() != nullptr) {
3934 for (;;) {
3935 oop head = list_head.resolve();
3936 if (list_head.cmpxchg(head, nullptr) == head) {
3937 return JNIHandles::make_local(THREAD, head);
3938 }
3939 }
3940 }
3941 ThreadBlockInVM tbivm(THREAD);
3942 parkEvent->park();
3943 }
3944 JVM_END
3945
3946 /*
3947 * Return the current class's class file version. The low order 16 bits of the
3948 * returned jint contain the class's major version. The high order 16 bits
3949 * contain the class's minor version.
3950 */
3951 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3952 oop mirror = JNIHandles::resolve_non_null(current);
3953 if (java_lang_Class::is_primitive(mirror)) {
3954 // return latest major version and minor version of 0.
3955 return JVM_CLASSFILE_MAJOR_VERSION;
3956 }
3957 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3958 return (ik->minor_version() << 16) | ik->major_version();
3959 JVM_END
3960
3961 /*
3962 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3963 * get the value will see a materialized value and not a scalar-replaced
3964 * null value.
3965 */
3966 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3967 JVM_EnsureMaterializedForStackWalk(env, value);
3968 JVM_END
3969
3970 /*
3971 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3972 */
3973 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3974 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3975 JVM_END