1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/aotMetaspace.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/classListParser.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/dynamicArchive.hpp"
31 #include "cds/heapShared.hpp"
32 #include "cds/lambdaFormInvokers.hpp"
33 #include "cds/lambdaProxyClassDictionary.hpp"
34 #include "classfile/classFileStream.hpp"
35 #include "classfile/classLoader.inline.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/flatArrayKlass.hpp"
62 #include "oops/instanceKlass.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/objArrayKlass.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/oop.inline.hpp"
68 #include "oops/recordComponent.hpp"
69 #include "oops/refArrayOop.inline.hpp"
70 #include "prims/foreignGlobals.hpp"
71 #include "prims/jvm_misc.hpp"
72 #include "prims/jvmtiExport.hpp"
73 #include "prims/jvmtiThreadState.inline.hpp"
74 #include "prims/stackwalk.hpp"
75 #include "runtime/arguments.hpp"
76 #include "runtime/atomicAccess.hpp"
77 #include "runtime/continuation.hpp"
78 #include "runtime/deoptimization.hpp"
79 #include "runtime/globals_extension.hpp"
80 #include "runtime/handles.inline.hpp"
81 #include "runtime/handshake.hpp"
82 #include "runtime/init.hpp"
83 #include "runtime/interfaceSupport.inline.hpp"
84 #include "runtime/java.hpp"
85 #include "runtime/javaCalls.hpp"
86 #include "runtime/javaThread.hpp"
87 #include "runtime/jfieldIDWorkaround.hpp"
88 #include "runtime/jniHandles.inline.hpp"
89 #include "runtime/os.inline.hpp"
90 #include "runtime/osThread.hpp"
91 #include "runtime/perfData.hpp"
92 #include "runtime/reflection.hpp"
93 #include "runtime/synchronizer.hpp"
94 #include "runtime/threadIdentifier.hpp"
95 #include "runtime/threadSMR.hpp"
96 #include "runtime/vframe.inline.hpp"
97 #include "runtime/vm_version.hpp"
98 #include "runtime/vmOperations.hpp"
99 #include "services/attachListener.hpp"
100 #include "services/management.hpp"
101 #include "services/threadService.hpp"
102 #include "utilities/checkedCast.hpp"
103 #include "utilities/copy.hpp"
104 #include "utilities/defaultStream.hpp"
105 #include "utilities/dtrace.hpp"
106 #include "utilities/events.hpp"
107 #include "utilities/macros.hpp"
108 #include "utilities/utf8.hpp"
109 #include "utilities/zipLibrary.hpp"
110 #if INCLUDE_CDS
111 #include "classfile/systemDictionaryShared.hpp"
112 #endif
113 #if INCLUDE_JFR
114 #include "jfr/jfr.hpp"
115 #endif
116 #if INCLUDE_MANAGEMENT
117 #include "services/finalizerService.hpp"
118 #endif
119 #ifdef LINUX
120 #include "osContainer_linux.hpp"
121 #endif
122
123 #include <errno.h>
124
125 /*
126 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
127 such ctors and calls MUST NOT come between an oop declaration/init and its
128 usage because if objects are move this may cause various memory stomps, bus
129 errors and segfaults. Here is a cookbook for causing so called "naked oop
130 failures":
131
132 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
133 // Object address to be held directly in mirror & not visible to GC
134 oop mirror = JNIHandles::resolve_non_null(ofClass);
135
136 // If this ctor can hit a safepoint, moving objects around, then
137 ComplexConstructor foo;
138
139 // Boom! mirror may point to JUNK instead of the intended object
140 (some dereference of mirror)
141
142 // Here's another call that may block for GC, making mirror stale
143 MutexLocker ml(some_lock);
144
145 // And here's an initializer that can result in a stale oop
146 // all in one step.
147 oop o = call_that_can_throw_exception(TRAPS);
148
149
150 The solution is to keep the oop declaration BELOW the ctor or function
151 call that might cause a GC, do another resolve to reassign the oop, or
152 consider use of a Handle instead of an oop so there is immunity from object
153 motion. But note that the "QUICK" entries below do not have a handlemark
154 and thus can only support use of handles passed in.
155 */
156
157 extern void trace_class_resolution(Klass* to_class) {
158 ResourceMark rm;
159 int line_number = -1;
160 const char * source_file = nullptr;
161 const char * trace = "explicit";
162 InstanceKlass* caller = nullptr;
163 JavaThread* jthread = JavaThread::current();
164 if (jthread->has_last_Java_frame()) {
165 vframeStream vfst(jthread);
166
167 // Scan up the stack skipping ClassLoader frames.
168 Method* last_caller = nullptr;
169
170 while (!vfst.at_end()) {
171 Method* m = vfst.method();
172 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
173 break;
174 }
175 last_caller = m;
176 vfst.next();
177 }
178 // if this is called from Class.forName0 and that is called from Class.forName,
179 // then print the caller of Class.forName. If this is Class.loadClass, then print
180 // that caller, otherwise keep quiet since this should be picked up elsewhere.
181 bool found_it = false;
182 if (!vfst.at_end() &&
183 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
184 vfst.method()->name() == vmSymbols::forName0_name()) {
185 vfst.next();
186 if (!vfst.at_end() &&
187 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
188 vfst.method()->name() == vmSymbols::forName_name()) {
189 vfst.next();
190 found_it = true;
191 }
192 } else if (last_caller != nullptr &&
193 last_caller->method_holder()->name() ==
194 vmSymbols::java_lang_ClassLoader() &&
195 last_caller->name() == vmSymbols::loadClass_name()) {
196 found_it = true;
197 } else if (!vfst.at_end()) {
198 if (vfst.method()->is_native()) {
199 // JNI call
200 found_it = true;
201 }
202 }
203 if (found_it && !vfst.at_end()) {
204 // found the caller
205 caller = vfst.method()->method_holder();
206 line_number = vfst.method()->line_number_from_bci(vfst.bci());
207 if (line_number == -1) {
208 // show method name if it's a native method
209 trace = vfst.method()->name_and_sig_as_C_string();
210 }
211 Symbol* s = caller->source_file_name();
212 if (s != nullptr) {
213 source_file = s->as_C_string();
214 }
215 }
216 }
217 if (caller != nullptr) {
218 if (to_class != caller) {
219 const char * from = caller->external_name();
220 const char * to = to_class->external_name();
221 // print in a single call to reduce interleaving between threads
222 if (source_file != nullptr) {
223 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
224 } else {
225 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
226 }
227 }
228 }
229 }
230
231 // java.lang.System //////////////////////////////////////////////////////////////////////
232
233
234 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
235 return os::javaTimeMillis();
236 JVM_END
237
238 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
239 return os::javaTimeNanos();
240 JVM_END
241
242 // The function below is actually exposed by jdk.internal.misc.VM and not
243 // java.lang.System, but we choose to keep it here so that it stays next
244 // to JVM_CurrentTimeMillis and JVM_NanoTime
245
246 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
247 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
248
249 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
250 jlong seconds;
251 jlong nanos;
252
253 os::javaTimeSystemUTC(seconds, nanos);
254
255 // We're going to verify that the result can fit in a long.
256 // For that we need the difference in seconds between 'seconds'
257 // and 'offset_secs' to be such that:
258 // |seconds - offset_secs| < (2^63/10^9)
259 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
260 // which makes |seconds - offset_secs| < 2^33
261 // and we will prefer +/- 2^32 as the maximum acceptable diff
262 // as 2^32 has a more natural feel than 2^33...
263 //
264 // So if |seconds - offset_secs| >= 2^32 - we return a special
265 // sentinel value (-1) which the caller should take as an
266 // exception value indicating that the offset given to us is
267 // too far from range of the current time - leading to too big
268 // a nano adjustment. The caller is expected to recover by
269 // computing a more accurate offset and calling this method
270 // again. (For the record 2^32 secs is ~136 years, so that
271 // should rarely happen)
272 //
273 jlong diff = seconds - offset_secs;
274 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
275 return -1; // sentinel value: the offset is too far off the target
276 }
277
278 // return the adjustment. If you compute a time by adding
279 // this number of nanoseconds along with the number of seconds
280 // in the offset you should get the current UTC time.
281 return (diff * (jlong)1000000000) + nanos;
282 JVM_END
283
284 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
285 jobject dst, jint dst_pos, jint length))
286 // Check if we have null pointers
287 if (src == nullptr || dst == nullptr) {
288 THROW(vmSymbols::java_lang_NullPointerException());
289 }
290 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
291 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
292 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
293 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
294 // Do copy
295 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
296 JVM_END
297
298
299 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
300 JavaValue r(T_OBJECT);
301 // public synchronized Object put(Object key, Object value);
302 HandleMark hm(THREAD);
303 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
304 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
305 JavaCalls::call_virtual(&r,
306 props,
307 vmClasses::Properties_klass(),
308 vmSymbols::put_name(),
309 vmSymbols::object_object_object_signature(),
310 key_str,
311 value_str,
312 THREAD);
313 }
314
315
316 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
317
318 /*
319 * Return all of the system properties in a Java String array with alternating
320 * names and values from the jvm SystemProperty.
321 * Which includes some internal and all commandline -D defined properties.
322 */
323 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
324 ResourceMark rm(THREAD);
325 HandleMark hm(THREAD);
326 int ndx = 0;
327 int fixedCount = 2;
328
329 SystemProperty* p = Arguments::system_properties();
330 int count = Arguments::PropertyList_count(p);
331
332 // Allocate result String array
333 InstanceKlass* ik = vmClasses::String_klass();
334 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
335 objArrayHandle result_h(THREAD, r);
336
337 while (p != nullptr) {
338 const char * key = p->key();
339 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
340 const char * value = p->value();
341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
343 result_h->obj_at_put(ndx * 2, key_str());
344 result_h->obj_at_put(ndx * 2 + 1, value_str());
345 ndx++;
346 }
347 p = p->next();
348 }
349
350 // Convert the -XX:MaxDirectMemorySize= command line flag
351 // to the sun.nio.MaxDirectMemorySize property.
352 // Do this after setting user properties to prevent people
353 // from setting the value with a -D option, as requested.
354 // Leave empty if not supplied
355 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
356 char as_chars[256];
357 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
358 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
359 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
360 result_h->obj_at_put(ndx * 2, key_str());
361 result_h->obj_at_put(ndx * 2 + 1, value_str());
362 ndx++;
363 }
364
365 // JVM monitoring and management support
366 // Add the sun.management.compiler property for the compiler's name
367 {
368 #undef CSIZE
369 #if defined(_LP64)
370 #define CSIZE "64-Bit "
371 #else
372 #define CSIZE
373 #endif // 64bit
374
375 #if COMPILER1_AND_COMPILER2
376 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
377 #else
378 #if defined(COMPILER1)
379 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
380 #elif defined(COMPILER2)
381 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
382 #elif INCLUDE_JVMCI
383 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
384 #else
385 const char* compiler_name = "";
386 #endif // compilers
387 #endif // COMPILER1_AND_COMPILER2
388
389 if (*compiler_name != '\0' &&
390 (Arguments::mode() != Arguments::_int)) {
391 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
392 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
393 result_h->obj_at_put(ndx * 2, key_str());
394 result_h->obj_at_put(ndx * 2 + 1, value_str());
395 ndx++;
396 }
397 }
398
399 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
400 JVM_END
401
402
403 /*
404 * Return the temporary directory that the VM uses for the attach
405 * and perf data files.
406 *
407 * It is important that this directory is well-known and the
408 * same for all VM instances. It cannot be affected by configuration
409 * variables such as java.io.tmpdir.
410 */
411 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
412 HandleMark hm(THREAD);
413 const char* temp_dir = os::get_temp_directory();
414 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
415 return (jstring) JNIHandles::make_local(THREAD, h());
416 JVM_END
417
418 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
419 if (len < 0) {
420 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
421 }
422 elmClass->initialize(CHECK);
423 if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
424 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
425 }
426 if (elmClass->is_abstract()) {
427 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
428 }
429 }
430
431 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
432 oop o = JNIHandles::resolve_non_null(orig);
433 assert(o->is_array(), "Must be");
434 oop array = nullptr;
435 arrayOop org = (arrayOop)o;
436 arrayHandle oh(THREAD, org);
437 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
438 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
439 int len = to - from; // length of the new array
440 if (ak->is_null_free_array_klass()) {
441 if ((len != 0) && (from >= org->length() || to > org->length())) {
442 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
443 }
444 }
445 if (org->is_flatArray()) {
446 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
447 LayoutKind lk = fak->layout_kind();
448 ArrayKlass::ArrayProperties props = ArrayKlass::ArrayProperties::DEFAULT;
449 switch(lk) {
450 case LayoutKind::ATOMIC_FLAT:
451 props = ArrayKlass::ArrayProperties::NULL_RESTRICTED;
452 break;
453 case LayoutKind::NON_ATOMIC_FLAT:
454 props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED | ArrayKlass::ArrayProperties::NON_ATOMIC);
455 break;
456 case LayoutKind::NULLABLE_ATOMIC_FLAT:
457 props = ArrayKlass::ArrayProperties::NON_ATOMIC;
458 break;
459 default:
460 ShouldNotReachHere();
461 }
462 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
463 arrayHandle ah(THREAD, (arrayOop)array);
464 int end = to < oh()->length() ? to : oh()->length();
465 for (int i = from; i < end; i++) {
466 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
467 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
468 vk->copy_payload_to_addr(src, dst, lk, false);
469 }
470 array = ah();
471 } else {
472 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
473 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
474 int end = to < oh()->length() ? to : oh()->length();
475 for (int i = from; i < end; i++) {
476 if (i < ((objArrayOop)oh())->length()) {
477 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
478 } else {
479 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
480 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
481 }
482 }
483 }
484 return (jarray) JNIHandles::make_local(THREAD, array);
485 JVM_END
486
487 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
488 oop mirror = JNIHandles::resolve_non_null(elmClass);
489 oop init = JNIHandles::resolve(initVal);
490 if (init == nullptr) {
491 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
492 }
493 Handle init_h(THREAD, init);
494 Klass* klass = java_lang_Class::as_Klass(mirror);
495 if (klass != init_h()->klass()) {
496 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
497 }
498 validate_array_arguments(klass, len, CHECK_NULL);
499 InlineKlass* vk = InlineKlass::cast(klass);
500 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
501 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
502 for (int i = 0; i < len; i++) {
503 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
504 }
505 return (jarray) JNIHandles::make_local(THREAD, array);
506 JVM_END
507
508 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
509 oop mirror = JNIHandles::resolve_non_null(elmClass);
510 oop init = JNIHandles::resolve(initVal);
511 if (init == nullptr) {
512 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
513 }
514 Handle init_h(THREAD, init);
515 Klass* klass = java_lang_Class::as_Klass(mirror);
516 if (klass != init_h()->klass()) {
517 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
518 }
519 validate_array_arguments(klass, len, CHECK_NULL);
520 InlineKlass* vk = InlineKlass::cast(klass);
521 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
522 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
523 for (int i = 0; i < len; i++) {
524 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
525 }
526 return (jarray) JNIHandles::make_local(THREAD, array);
527 JVM_END
528
529 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
530 oop mirror = JNIHandles::resolve_non_null(elmClass);
531 Klass* klass = java_lang_Class::as_Klass(mirror);
532 klass->initialize(CHECK_NULL);
533 validate_array_arguments(klass, len, CHECK_NULL);
534 InlineKlass* vk = InlineKlass::cast(klass);
535 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
536 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
537 return (jarray) JNIHandles::make_local(THREAD, array);
538 JVM_END
539
540 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
541 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
542 return oop->is_flatArray();
543 JVM_END
544
545 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
546 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
547 return oop->is_null_free_array();
548 JVM_END
549
550 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
551 // There are multiple cases where an array can/must support atomic access:
552 // - the array is a reference array
553 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
554 // - the array is flat and its component type is naturally atomic
555 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
556 if (oop->is_refArray()) return true;
557 if (oop->is_flatArray()) {
558 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
559 if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) {
560 return true;
561 }
562 if (fak->element_klass()->is_naturally_atomic()) return true;
563 }
564 return false;
565 JVM_END
566
567 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
568
569 extern volatile jint vm_created;
570
571 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
572 EventShutdown event;
573 if (event.should_commit()) {
574 event.set_reason("Shutdown requested from Java");
575 event.commit();
576 }
577 JVM_END
578
579
580 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
581 before_exit(thread, true);
582 vm_exit(code);
583 JVM_END
584
585
586 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
587 if (!DisableExplicitGC) {
588 EventSystemGC event;
589 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
590 Universe::heap()->collect(GCCause::_java_lang_system_gc);
591 event.commit();
592 }
593 JVM_END
594
595
596 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
597 return Universe::heap()->millis_since_last_whole_heap_examined();
598 JVM_END
599
600
601 static inline jlong convert_size_t_to_jlong(size_t val) {
602 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
603 NOT_LP64 (return (jlong)val;)
604 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
605 }
606
607 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
608 size_t n = Universe::heap()->capacity();
609 return convert_size_t_to_jlong(n);
610 JVM_END
611
612
613 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
614 size_t n = Universe::heap()->unused();
615 return convert_size_t_to_jlong(n);
616 JVM_END
617
618
619 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
620 size_t n = Universe::heap()->max_capacity();
621 return convert_size_t_to_jlong(n);
622 JVM_END
623
624
625 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
626 return os::active_processor_count();
627 JVM_END
628
629 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
630 #ifdef LINUX
631 if (UseContainerSupport) {
632 return JNI_TRUE;
633 }
634 #endif
635 return JNI_FALSE;
636 JVM_END
637
638 JVM_LEAF(jboolean, JVM_IsContainerized(void))
639 #ifdef LINUX
640 if (OSContainer::is_containerized()) {
641 return JNI_TRUE;
642 }
643 #endif
644 return JNI_FALSE;
645 JVM_END
646
647 // java.lang.Throwable //////////////////////////////////////////////////////
648
649 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
650 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
651 java_lang_Throwable::fill_in_stack_trace(exception);
652 JVM_END
653
654 // java.lang.NullPointerException ///////////////////////////////////////////
655
656 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
657 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
658
659 oop exc = JNIHandles::resolve_non_null(throwable);
660
661 Method* method;
662 int bci;
663 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
664 return nullptr;
665 }
666 if (method->is_native()) {
667 return nullptr;
668 }
669
670 stringStream ss;
671 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
672 if (ok) {
673 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
674 return (jstring) JNIHandles::make_local(THREAD, result);
675 } else {
676 return nullptr;
677 }
678 JVM_END
679
680 // java.lang.StackTraceElement //////////////////////////////////////////////
681
682
683 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
684 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
685 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
686 objArrayHandle stack_trace(THREAD, st);
687 // Fill in the allocated stack trace
688 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
689 JVM_END
690
691
692 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
693 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
694 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
695 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
696 JVM_END
697
698
699 // java.lang.StackWalker //////////////////////////////////////////////////////
700 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
701 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
702
703 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
704 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
705 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
706 if (!have_name) {
707 oop name = StringTable::intern(method->name(), CHECK);
708 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
709 }
710 if (!have_type) {
711 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
712 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
713 }
714 JVM_END
715
716 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
717 jint skip_frames, jobject contScope, jobject cont,
718 jint buffer_size, jint start_index, jobjectArray frames))
719 if (!thread->has_last_Java_frame()) {
720 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
721 }
722
723 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
724 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
725 Handle cont_h(THREAD, JNIHandles::resolve(cont));
726 // frames array is a ClassFrameInfo[] array when only getting caller reference,
727 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
728 // be null.
729 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
730 objArrayHandle frames_array_h(THREAD, fa);
731
732 if (frames_array_h->length() < buffer_size) {
733 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
734 }
735
736 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
737 buffer_size, start_index, frames_array_h, CHECK_NULL);
738 return JNIHandles::make_local(THREAD, result);
739 JVM_END
740
741
742 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
743 jint last_batch_count, jint buffer_size, jint start_index,
744 jobjectArray frames))
745 // frames array is a ClassFrameInfo[] array when only getting caller reference,
746 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
747 // be null.
748 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
749 objArrayHandle frames_array_h(THREAD, fa);
750
751 if (frames_array_h->length() < buffer_size) {
752 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
753 }
754
755 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
756 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
757 start_index, frames_array_h, THREAD);
758 JVM_END
759
760 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
761 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
762 objArrayHandle frames_array_h(THREAD, fa);
763 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
764 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
765
766 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
767 JVM_END
768
769 // java.lang.Object ///////////////////////////////////////////////
770
771
772 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
773 // as implemented in the classic virtual machine; return 0 if object is null
774 if (handle == nullptr) {
775 return 0;
776 }
777 oop obj = JNIHandles::resolve_non_null(handle);
778 if (EnableValhalla && obj->klass()->is_inline_klass()) {
779 JavaValue result(T_INT);
780 JavaCallArguments args;
781 Handle ho(THREAD, obj);
782 args.push_oop(ho);
783 methodHandle method(THREAD, Universe::value_object_hash_code_method());
784 JavaCalls::call(&result, method, &args, THREAD);
785 if (HAS_PENDING_EXCEPTION) {
786 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
787 Handle e(THREAD, PENDING_EXCEPTION);
788 CLEAR_PENDING_EXCEPTION;
789 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
790 }
791 }
792 return result.get_jint();
793 } else {
794 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
795 }
796 JVM_END
797
798
799 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
800 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
801 ObjectSynchronizer::wait(obj, ms, CHECK);
802 JVM_END
803
804
805 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
806 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
807 ObjectSynchronizer::notify(obj, CHECK);
808 JVM_END
809
810
811 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
812 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
813 ObjectSynchronizer::notifyall(obj, CHECK);
814 JVM_END
815
816
817 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
818 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
819 Klass* klass = obj->klass();
820 JvmtiVMObjectAllocEventCollector oam;
821
822 #ifdef ASSERT
823 // Just checking that the cloneable flag is set correct
824 if (obj->is_array()) {
825 guarantee(klass->is_cloneable(), "all arrays are cloneable");
826 } else {
827 guarantee(obj->is_instance(), "should be instanceOop");
828 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
829 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
830 }
831 #endif
832
833 // Check if class of obj supports the Cloneable interface.
834 // All arrays are considered to be cloneable (See JLS 20.1.5).
835 // All j.l.r.Reference classes are considered non-cloneable.
836 if (!klass->is_cloneable() ||
837 (klass->is_instance_klass() &&
838 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
839 ResourceMark rm(THREAD);
840 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
841 }
842
843 if (klass->is_inline_klass()) {
844 // Value instances have no identity, so return the current instance instead of allocating a new one
845 // Value classes cannot have finalizers, so the method can return immediately
846 return JNIHandles::make_local(THREAD, obj());
847 }
848
849 // Make shallow object copy
850 const size_t size = obj->size();
851 oop new_obj_oop = nullptr;
852 if (obj->is_array()) {
853 const int length = ((arrayOop)obj())->length();
854 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
855 /* do_zero */ true, CHECK_NULL);
856 } else {
857 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
858 }
859
860 HeapAccess<>::clone(obj(), new_obj_oop, size);
861
862 Handle new_obj(THREAD, new_obj_oop);
863 // Caution: this involves a java upcall, so the clone should be
864 // "gc-robust" by this stage.
865 if (klass->has_finalizer()) {
866 assert(obj->is_instance(), "should be instanceOop");
867 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
868 new_obj = Handle(THREAD, new_obj_oop);
869 }
870
871 return JNIHandles::make_local(THREAD, new_obj());
872 JVM_END
873
874 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
875
876 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
877 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
878 JVM_END
879
880 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
881 return InstanceKlass::is_finalization_enabled();
882 JVM_END
883
884 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
885
886 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
887 CONT_RegisterNativeMethods(env, cls);
888 JVM_END
889
890 // java.io.File ///////////////////////////////////////////////////////////////
891
892 JVM_LEAF(char*, JVM_NativePath(char* path))
893 return os::native_path(path);
894 JVM_END
895
896
897 // Misc. class handling ///////////////////////////////////////////////////////////
898
899
900 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
901 // Getting the class of the caller frame.
902 //
903 // The call stack at this point looks something like this:
904 //
905 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
906 // [1] [ @CallerSensitive API.method ]
907 // [.] [ (skipped intermediate frames) ]
908 // [n] [ caller ]
909 vframeStream vfst(thread);
910 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
911 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
912 Method* m = vfst.method();
913 assert(m != nullptr, "sanity");
914 switch (n) {
915 case 0:
916 // This must only be called from Reflection.getCallerClass
917 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
918 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
919 }
920 // fall-through
921 case 1:
922 // Frame 0 and 1 must be caller sensitive.
923 if (!m->caller_sensitive()) {
924 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
925 }
926 break;
927 default:
928 if (!m->is_ignored_by_security_stack_walk()) {
929 // We have reached the desired frame; return the holder class.
930 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
931 }
932 break;
933 }
934 }
935 return nullptr;
936 JVM_END
937
938
939 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
940 oop mirror = nullptr;
941 BasicType t = name2type(utf);
942 if (t != T_ILLEGAL && !is_reference_type(t)) {
943 mirror = Universe::java_mirror(t);
944 }
945 if (mirror == nullptr) {
946 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
947 } else {
948 return (jclass) JNIHandles::make_local(THREAD, mirror);
949 }
950 JVM_END
951
952
953 // Returns a class loaded by the bootstrap class loader; or null
954 // if not found. ClassNotFoundException is not thrown.
955 // FindClassFromBootLoader is exported to the launcher for windows.
956 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
957 const char* name))
958 // Java libraries should ensure that name is never null or illegal.
959 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
960 // It's impossible to create this class; the name cannot fit
961 // into the constant pool.
962 return nullptr;
963 }
964 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
965
966 TempNewSymbol h_name = SymbolTable::new_symbol(name);
967 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
968 if (k == nullptr) {
969 return nullptr;
970 }
971
972 if (log_is_enabled(Debug, class, resolve)) {
973 trace_class_resolution(k);
974 }
975 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
976 JVM_END
977
978 // Find a class with this name in this loader.
979 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
980 jboolean init, jobject loader))
981 TempNewSymbol h_name =
982 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
983 CHECK_NULL);
984
985 oop loader_oop = JNIHandles::resolve(loader);
986 Handle h_loader(THREAD, loader_oop);
987
988 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
989 false, THREAD);
990
991 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
992 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
993 }
994 return result;
995 JVM_END
996
997 // Currently only called from the old verifier.
998 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
999 jboolean init, jclass from))
1000 TempNewSymbol h_name =
1001 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1002 CHECK_NULL);
1003 oop from_class_oop = JNIHandles::resolve(from);
1004 assert(from_class_oop != nullptr, "must be");
1005 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1006 assert(from_class != nullptr, "must be");
1007 oop class_loader = from_class->class_loader();
1008
1009 Handle h_loader(THREAD, class_loader);
1010 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1011
1012 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1013 // this function is generally only used for class loading during verification.
1014 ResourceMark rm;
1015 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1016 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1017 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1018 }
1019
1020 #if INCLUDE_CDS
1021 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1022 InstanceKlass* ik = InstanceKlass::cast(from_class);
1023 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1024 }
1025 #endif
1026
1027 return result;
1028 JVM_END
1029
1030 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1031 static jclass jvm_define_class_common(const char *name,
1032 jobject loader, const jbyte *buf,
1033 jsize len, jobject pd, const char *source,
1034 TRAPS) {
1035 if (source == nullptr) source = "__JVM_DefineClass__";
1036
1037 JavaThread* jt = THREAD;
1038
1039 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1040 ClassLoader::perf_define_appclass_selftime(),
1041 ClassLoader::perf_define_appclasses(),
1042 jt->get_thread_stat()->perf_recursion_counts_addr(),
1043 jt->get_thread_stat()->perf_timers_addr(),
1044 PerfClassTraceTime::DEFINE_CLASS);
1045
1046 if (UsePerfData) {
1047 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1048 }
1049
1050 // Class resolution will get the class name from the .class stream if the name is null.
1051 TempNewSymbol class_name = name == nullptr ? nullptr :
1052 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1053 CHECK_NULL);
1054
1055 ResourceMark rm(THREAD);
1056 ClassFileStream st((u1*)buf, len, source);
1057 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1058 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1059 ClassLoadInfo cl_info(protection_domain);
1060 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1061 class_loader,
1062 cl_info,
1063 CHECK_NULL);
1064
1065 if (log_is_enabled(Debug, class, resolve)) {
1066 trace_class_resolution(k);
1067 }
1068
1069 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1070 }
1071
1072 enum {
1073 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1074 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1075 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1076 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1077 };
1078
1079 /*
1080 * Define a class with the specified flags that indicates if it's a nestmate,
1081 * hidden, or strongly referenced from class loader.
1082 */
1083 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1084 const jbyte *buf, jsize len, jobject pd,
1085 jboolean init, int flags, jobject classData, TRAPS) {
1086 ResourceMark rm(THREAD);
1087
1088 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1089 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1090 if (lookup_k == nullptr) {
1091 // The error message is wrong. We come here only if lookup is a primitive class
1092 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1093 }
1094
1095 Handle class_loader (THREAD, lookup_k->class_loader());
1096
1097 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1098 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1099 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1100 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1101
1102 InstanceKlass* host_class = nullptr;
1103 if (is_nestmate) {
1104 host_class = lookup_k->nest_host(CHECK_NULL);
1105 }
1106
1107 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1108 name,
1109 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1110 is_nestmate ? host_class->external_name() : "",
1111 is_hidden ? "hidden" : "not hidden",
1112 is_strong ? "strong" : "weak",
1113 vm_annotations ? "with vm annotations" : "without vm annotation");
1114
1115 if (!is_hidden) {
1116 // classData is only applicable for hidden classes
1117 if (classData != nullptr) {
1118 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1119 }
1120 if (is_nestmate) {
1121 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1122 }
1123 if (!is_strong) {
1124 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1125 }
1126 if (vm_annotations) {
1127 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1128 }
1129 if (flags != STRONG_LOADER_LINK) {
1130 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1131 err_msg("invalid flag 0x%x", flags));
1132 }
1133 }
1134
1135 // Class resolution will get the class name from the .class stream if the name is null.
1136 TempNewSymbol class_name = name == nullptr ? nullptr :
1137 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1138 CHECK_NULL);
1139
1140 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1141 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1142 ClassFileStream st((u1*)buf, len, source);
1143
1144 InstanceKlass* ik = nullptr;
1145 if (!is_hidden) {
1146 ClassLoadInfo cl_info(protection_domain);
1147 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1148 class_loader,
1149 cl_info,
1150 CHECK_NULL);
1151
1152 if (log_is_enabled(Debug, class, resolve)) {
1153 trace_class_resolution(ik);
1154 }
1155 } else { // hidden
1156 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1157 ClassLoadInfo cl_info(protection_domain,
1158 host_class,
1159 classData_h,
1160 is_hidden,
1161 is_strong,
1162 vm_annotations);
1163 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1164 class_loader,
1165 cl_info,
1166 CHECK_NULL);
1167
1168 // The hidden class loader data has been artificially been kept alive to
1169 // this point. The mirror and any instances of this class have to keep
1170 // it alive afterwards.
1171 ik->class_loader_data()->dec_keep_alive_ref_count();
1172
1173 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1174 ModuleEntry* module = ik->module();
1175 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1176 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1177 module_name,
1178 ik->external_name(),
1179 host_class->external_name(),
1180 ik->is_hidden() ? "is hidden" : "is not hidden");
1181 }
1182 }
1183
1184 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1185 // non-hidden class or nestmate class must be in the same package as the Lookup class
1186 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1187 }
1188
1189 if (init) {
1190 ik->initialize(CHECK_NULL);
1191 } else {
1192 ik->link_class(CHECK_NULL);
1193 }
1194
1195 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1196 }
1197
1198 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1199 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1200 JVM_END
1201
1202 /*
1203 * Define a class with the specified lookup class.
1204 * lookup: Lookup class
1205 * name: the name of the class
1206 * buf: class bytes
1207 * len: length of class bytes
1208 * pd: protection domain
1209 * init: initialize the class
1210 * flags: properties of the class
1211 * classData: private static pre-initialized field
1212 */
1213 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1214 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1215
1216 if (lookup == nullptr) {
1217 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1218 }
1219
1220 assert(buf != nullptr, "buf must not be null");
1221
1222 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1223 JVM_END
1224
1225 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1226
1227 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1228 JVM_END
1229
1230 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1231 ResourceMark rm(THREAD);
1232
1233 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1234 char* str = java_lang_String::as_utf8_string(h_name());
1235
1236 // Sanity check, don't expect null
1237 if (str == nullptr) return nullptr;
1238
1239 // Internalize the string, converting '.' to '/' in string.
1240 char* p = (char*)str;
1241 while (*p != '\0') {
1242 if (*p == '.') {
1243 *p = '/';
1244 }
1245 p++;
1246 }
1247
1248 const int str_len = (int)(p - str);
1249 if (str_len > Symbol::max_length()) {
1250 // It's impossible to create this class; the name cannot fit
1251 // into the constant pool.
1252 return nullptr;
1253 }
1254 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1255
1256 // Security Note:
1257 // The Java level wrapper will perform the necessary security check allowing
1258 // us to pass the null as the initiating class loader.
1259 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1260 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1261 #if INCLUDE_CDS
1262 if (k == nullptr) {
1263 // If the class is not already loaded, try to see if it's in the shared
1264 // archive for the current classloader (h_loader).
1265 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1266 }
1267 #endif
1268 return (k == nullptr) ? nullptr :
1269 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1270 JVM_END
1271
1272 // Module support //////////////////////////////////////////////////////////////////////////////
1273
1274 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1275 jstring location, jobjectArray packages))
1276 Handle h_module (THREAD, JNIHandles::resolve(module));
1277 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1278 JVM_END
1279
1280 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1281 Handle h_module (THREAD, JNIHandles::resolve(module));
1282 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1283 JVM_END
1284
1285 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1286 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1287 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1288 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1289 JVM_END
1290
1291 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1292 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1293 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1294 JVM_END
1295
1296 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1297 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1298 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1299 JVM_END
1300
1301 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1302 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1303 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1304 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1305 JVM_END
1306
1307 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1308 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1309 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1310 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1311 JVM_END
1312
1313 // Reflection support //////////////////////////////////////////////////////////////////////////////
1314
1315 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1316 assert (cls != nullptr, "illegal class");
1317 JvmtiVMObjectAllocEventCollector oam;
1318 ResourceMark rm(THREAD);
1319 HandleMark hm(THREAD);
1320 Handle java_class(THREAD, JNIHandles::resolve(cls));
1321 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1322 return (jstring) JNIHandles::make_local(THREAD, result);
1323 JVM_END
1324
1325
1326 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1327 JvmtiVMObjectAllocEventCollector oam;
1328 oop mirror = JNIHandles::resolve_non_null(cls);
1329
1330 // Special handling for primitive objects
1331 if (java_lang_Class::is_primitive(mirror)) {
1332 // Primitive objects does not have any interfaces
1333 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1334 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1335 }
1336
1337 Klass* klass = java_lang_Class::as_Klass(mirror);
1338 // Figure size of result array
1339 int size;
1340 if (klass->is_instance_klass()) {
1341 InstanceKlass* ik = InstanceKlass::cast(klass);
1342 size = ik->local_interfaces()->length();
1343 } else {
1344 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1345 size = 2;
1346 }
1347
1348 // Allocate result array
1349 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1350 objArrayHandle result (THREAD, r);
1351 // Fill in result
1352 if (klass->is_instance_klass()) {
1353 // Regular instance klass, fill in all local interfaces
1354 for (int index = 0; index < size; index++) {
1355 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1356 result->obj_at_put(index, k->java_mirror());
1357 }
1358 } else {
1359 // All arrays implement java.lang.Cloneable and java.io.Serializable
1360 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1361 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1362 }
1363 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1364 JVM_END
1365
1366
1367 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1368 oop mirror = JNIHandles::resolve_non_null(cls);
1369 if (java_lang_Class::is_primitive(mirror)) {
1370 return JNI_FALSE;
1371 }
1372 Klass* k = java_lang_Class::as_Klass(mirror);
1373 return k->is_hidden();
1374 JVM_END
1375
1376 class ScopedValueBindingsResolver {
1377 public:
1378 InstanceKlass* Carrier_klass;
1379 ScopedValueBindingsResolver(JavaThread* THREAD) {
1380 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1381 Carrier_klass = InstanceKlass::cast(k);
1382 }
1383 };
1384
1385 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1386 ResourceMark rm(THREAD);
1387 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1388 JvmtiVMObjectAllocEventCollector oam;
1389
1390 static ScopedValueBindingsResolver resolver(THREAD);
1391
1392 // Iterate through Java frames
1393 vframeStream vfst(thread);
1394 for(; !vfst.at_end(); vfst.next()) {
1395 int loc = -1;
1396 // get method of frame
1397 Method* method = vfst.method();
1398
1399 Symbol *name = method->name();
1400
1401 InstanceKlass* holder = method->method_holder();
1402 if (name == vmSymbols::runWith_method_name()) {
1403 if (holder == vmClasses::Thread_klass()
1404 || holder == resolver.Carrier_klass) {
1405 loc = 1;
1406 }
1407 }
1408
1409 if (loc != -1) {
1410 javaVFrame *frame = vfst.asJavaVFrame();
1411 StackValueCollection* locals = frame->locals();
1412 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1413 Handle result = head_sv->get_obj();
1414 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1415 if (result() != nullptr) {
1416 return JNIHandles::make_local(THREAD, result());
1417 }
1418 }
1419 }
1420
1421 return nullptr;
1422 JVM_END
1423
1424 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1425 JvmtiVMObjectAllocEventCollector oam;
1426 // ofClass is a reference to a java_lang_Class object. The mirror object
1427 // of an InstanceKlass
1428 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1429 if (java_lang_Class::is_primitive(ofMirror) ||
1430 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1431 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1432 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1433 }
1434
1435 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1436 InnerClassesIterator iter(k);
1437
1438 if (iter.length() == 0) {
1439 // Neither an inner nor outer class
1440 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1441 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1442 }
1443
1444 // find inner class info
1445 constantPoolHandle cp(thread, k->constants());
1446 int length = iter.length();
1447
1448 // Allocate temp. result array
1449 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1450 objArrayHandle result (THREAD, r);
1451 int members = 0;
1452
1453 for (; !iter.done(); iter.next()) {
1454 int ioff = iter.inner_class_info_index();
1455 int ooff = iter.outer_class_info_index();
1456
1457 if (ioff != 0 && ooff != 0) {
1458 // Check to see if the name matches the class we're looking for
1459 // before attempting to find the class.
1460 if (cp->klass_name_at_matches(k, ooff)) {
1461 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1462 if (outer_klass == k) {
1463 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1464 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1465
1466 // Throws an exception if outer klass has not declared k as
1467 // an inner klass
1468 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1469
1470 result->obj_at_put(members, inner_klass->java_mirror());
1471 members++;
1472 }
1473 }
1474 }
1475 }
1476
1477 if (members != length) {
1478 // Return array of right length
1479 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1480 for(int i = 0; i < members; i++) {
1481 res->obj_at_put(i, result->obj_at(i));
1482 }
1483 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1484 }
1485
1486 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1487 JVM_END
1488
1489
1490 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1491 {
1492 // ofClass is a reference to a java_lang_Class object.
1493 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1494 if (java_lang_Class::is_primitive(ofMirror)) {
1495 return nullptr;
1496 }
1497 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1498 if (!klass->is_instance_klass()) {
1499 return nullptr;
1500 }
1501
1502 bool inner_is_member = false;
1503 Klass* outer_klass
1504 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1505 if (outer_klass == nullptr) return nullptr; // already a top-level class
1506 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1507 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1508 }
1509 JVM_END
1510
1511 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1512 {
1513 oop mirror = JNIHandles::resolve_non_null(cls);
1514 if (java_lang_Class::is_primitive(mirror)) {
1515 return nullptr;
1516 }
1517 Klass* klass = java_lang_Class::as_Klass(mirror);
1518 if (!klass->is_instance_klass()) {
1519 return nullptr;
1520 }
1521 InstanceKlass* k = InstanceKlass::cast(klass);
1522 int ooff = 0, noff = 0;
1523 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1524 if (noff != 0) {
1525 constantPoolHandle i_cp(thread, k->constants());
1526 Symbol* name = i_cp->symbol_at(noff);
1527 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1528 return (jstring) JNIHandles::make_local(THREAD, str());
1529 }
1530 }
1531 return nullptr;
1532 }
1533 JVM_END
1534
1535 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1536 assert (cls != nullptr, "illegal class");
1537 JvmtiVMObjectAllocEventCollector oam;
1538 ResourceMark rm(THREAD);
1539 oop mirror = JNIHandles::resolve_non_null(cls);
1540 // Return null for arrays and primitives
1541 if (!java_lang_Class::is_primitive(mirror)) {
1542 Klass* k = java_lang_Class::as_Klass(mirror);
1543 if (k->is_instance_klass()) {
1544 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1545 if (sym == nullptr) return nullptr;
1546 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1547 return (jstring) JNIHandles::make_local(THREAD, str());
1548 }
1549 }
1550 return nullptr;
1551 JVM_END
1552
1553
1554 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1555 assert (cls != nullptr, "illegal class");
1556 oop mirror = JNIHandles::resolve_non_null(cls);
1557 // Return null for arrays and primitives
1558 if (!java_lang_Class::is_primitive(mirror)) {
1559 Klass* k = java_lang_Class::as_Klass(mirror);
1560 if (k->is_instance_klass()) {
1561 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1562 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1563 }
1564 }
1565 return nullptr;
1566 JVM_END
1567
1568
1569 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1570 // some of this code was adapted from from jni_FromReflectedField
1571
1572 oop reflected = JNIHandles::resolve_non_null(field);
1573 oop mirror = java_lang_reflect_Field::clazz(reflected);
1574 int slot = java_lang_reflect_Field::slot(reflected);
1575 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1576
1577 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1578 int offset = ik->field_offset(slot);
1579
1580 if (modifiers & JVM_ACC_STATIC) {
1581 // for static fields we only look in the current class
1582 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1583 assert(false, "cannot find static field");
1584 return false;
1585 }
1586 } else {
1587 // for instance fields we start with the current class and work
1588 // our way up through the superclass chain
1589 if (!ik->find_field_from_offset(offset, false, &fd)) {
1590 assert(false, "cannot find instance field");
1591 return false;
1592 }
1593 }
1594 return true;
1595 }
1596
1597 static Method* jvm_get_method_common(jobject method) {
1598 // some of this code was adapted from from jni_FromReflectedMethod
1599
1600 oop reflected = JNIHandles::resolve_non_null(method);
1601 oop mirror = nullptr;
1602 int slot = 0;
1603
1604 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1605 mirror = java_lang_reflect_Constructor::clazz(reflected);
1606 slot = java_lang_reflect_Constructor::slot(reflected);
1607 } else {
1608 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1609 "wrong type");
1610 mirror = java_lang_reflect_Method::clazz(reflected);
1611 slot = java_lang_reflect_Method::slot(reflected);
1612 }
1613 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1614
1615 Method* m = ik->method_with_idnum(slot);
1616 assert(m != nullptr, "cannot find method");
1617 return m; // caller has to deal with null in product mode
1618 }
1619
1620 /* Type use annotations support (JDK 1.8) */
1621
1622 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1623 assert (cls != nullptr, "illegal class");
1624 ResourceMark rm(THREAD);
1625 // Return null for arrays and primitives
1626 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1627 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1628 if (k->is_instance_klass()) {
1629 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1630 if (type_annotations != nullptr) {
1631 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1632 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1633 }
1634 }
1635 }
1636 return nullptr;
1637 JVM_END
1638
1639 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1640 assert (method != nullptr, "illegal method");
1641 // method is a handle to a java.lang.reflect.Method object
1642 Method* m = jvm_get_method_common(method);
1643 if (m == nullptr) {
1644 return nullptr;
1645 }
1646
1647 AnnotationArray* type_annotations = m->type_annotations();
1648 if (type_annotations != nullptr) {
1649 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1650 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1651 }
1652
1653 return nullptr;
1654 JVM_END
1655
1656 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1657 assert (field != nullptr, "illegal field");
1658 fieldDescriptor fd;
1659 bool gotFd = jvm_get_field_common(field, fd);
1660 if (!gotFd) {
1661 return nullptr;
1662 }
1663
1664 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1665 JVM_END
1666
1667 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1668 if (!cp->is_within_bounds(index)) {
1669 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1670 }
1671 }
1672
1673 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1674 {
1675 // method is a handle to a java.lang.reflect.Method object
1676 Method* method_ptr = jvm_get_method_common(method);
1677 methodHandle mh (THREAD, method_ptr);
1678 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1679 const int num_params = mh->method_parameters_length();
1680
1681 if (num_params < 0) {
1682 // A -1 return value from method_parameters_length means there is no
1683 // parameter data. Return null to indicate this to the reflection
1684 // API.
1685 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1686 return (jobjectArray)nullptr;
1687 } else {
1688 // Otherwise, we return something up to reflection, even if it is
1689 // a zero-length array. Why? Because in some cases this can
1690 // trigger a MalformedParametersException.
1691
1692 // make sure all the symbols are properly formatted
1693 for (int i = 0; i < num_params; i++) {
1694 MethodParametersElement* params = mh->method_parameters_start();
1695 int index = params[i].name_cp_index;
1696 constantPoolHandle cp(THREAD, mh->constants());
1697 bounds_check(cp, index, CHECK_NULL);
1698
1699 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1700 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1701 "Wrong type at constant pool index");
1702 }
1703
1704 }
1705
1706 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1707 objArrayHandle result (THREAD, result_oop);
1708
1709 for (int i = 0; i < num_params; i++) {
1710 MethodParametersElement* params = mh->method_parameters_start();
1711 // For a 0 index, give a null symbol
1712 Symbol* sym = 0 != params[i].name_cp_index ?
1713 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1714 int flags = params[i].flags;
1715 oop param = Reflection::new_parameter(reflected_method, i, sym,
1716 flags, CHECK_NULL);
1717 result->obj_at_put(i, param);
1718 }
1719 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1720 }
1721 }
1722 JVM_END
1723
1724 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1725
1726 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1727 {
1728 JvmtiVMObjectAllocEventCollector oam;
1729
1730 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1731 // Exclude primitive types and array types
1732 if (java_lang_Class::is_primitive(ofMirror) ||
1733 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1734 // Return empty array
1735 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1736 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1737 }
1738
1739 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1740 constantPoolHandle cp(THREAD, k->constants());
1741
1742 // Ensure class is linked
1743 k->link_class(CHECK_NULL);
1744
1745 // Allocate result
1746 int num_fields;
1747
1748 if (publicOnly) {
1749 num_fields = 0;
1750 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1751 if (fs.access_flags().is_public()) ++num_fields;
1752 }
1753 } else {
1754 num_fields = k->java_fields_count();
1755 }
1756
1757 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1758 objArrayHandle result (THREAD, r);
1759
1760 int out_idx = 0;
1761 fieldDescriptor fd;
1762 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1763 if (!publicOnly || fs.access_flags().is_public()) {
1764 fd.reinitialize(k, fs.to_FieldInfo());
1765 oop field = Reflection::new_field(&fd, CHECK_NULL);
1766 result->obj_at_put(out_idx, field);
1767 ++out_idx;
1768 }
1769 }
1770 assert(out_idx == num_fields, "just checking");
1771 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1772 }
1773 JVM_END
1774
1775 // A class is a record if and only if it is final and a direct subclass of
1776 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1777 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1778 {
1779 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1780 if (k != nullptr && k->is_instance_klass()) {
1781 InstanceKlass* ik = InstanceKlass::cast(k);
1782 return ik->is_record();
1783 } else {
1784 return false;
1785 }
1786 }
1787 JVM_END
1788
1789 // Returns an array containing the components of the Record attribute,
1790 // or null if the attribute is not present.
1791 //
1792 // Note that this function returns the components of the Record attribute
1793 // even if the class is not a record.
1794 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1795 {
1796 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1797
1798 Array<RecordComponent*>* components = ik->record_components();
1799 if (components != nullptr) {
1800 JvmtiVMObjectAllocEventCollector oam;
1801 constantPoolHandle cp(THREAD, ik->constants());
1802 int length = components->length();
1803 assert(length >= 0, "unexpected record_components length");
1804 objArrayOop record_components =
1805 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1806 objArrayHandle components_h (THREAD, record_components);
1807
1808 for (int x = 0; x < length; x++) {
1809 RecordComponent* component = components->at(x);
1810 assert(component != nullptr, "unexpected null record component");
1811 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1812 components_h->obj_at_put(x, component_oop);
1813 }
1814 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1815 }
1816
1817 return nullptr;
1818 }
1819 JVM_END
1820
1821 static jobjectArray get_class_declared_methods_helper(
1822 JNIEnv *env,
1823 jclass ofClass, jboolean publicOnly,
1824 bool want_constructor,
1825 Klass* klass, TRAPS) {
1826
1827 JvmtiVMObjectAllocEventCollector oam;
1828
1829 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1830 // Exclude primitive types and array types
1831 if (java_lang_Class::is_primitive(ofMirror)
1832 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1833 // Return empty array
1834 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1835 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1836 }
1837
1838 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1839
1840 // Ensure class is linked
1841 k->link_class(CHECK_NULL);
1842
1843 Array<Method*>* methods = k->methods();
1844 int methods_length = methods->length();
1845
1846 // Save original method_idnum in case of redefinition, which can change
1847 // the idnum of obsolete methods. The new method will have the same idnum
1848 // but if we refresh the methods array, the counts will be wrong.
1849 ResourceMark rm(THREAD);
1850 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1851 int num_methods = 0;
1852
1853 // Select methods matching the criteria.
1854 for (int i = 0; i < methods_length; i++) {
1855 Method* method = methods->at(i);
1856 if (want_constructor && !method->is_object_constructor()) {
1857 continue;
1858 }
1859 if (!want_constructor &&
1860 (method->is_object_constructor() || method->is_class_initializer() ||
1861 method->is_overpass())) {
1862 continue;
1863 }
1864 if (publicOnly && !method->is_public()) {
1865 continue;
1866 }
1867 idnums->push(method->method_idnum());
1868 ++num_methods;
1869 }
1870
1871 // Allocate result
1872 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1873 objArrayHandle result (THREAD, r);
1874
1875 // Now just put the methods that we selected above, but go by their idnum
1876 // in case of redefinition. The methods can be redefined at any safepoint,
1877 // so above when allocating the oop array and below when creating reflect
1878 // objects.
1879 for (int i = 0; i < num_methods; i++) {
1880 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1881 if (method.is_null()) {
1882 // Method may have been deleted and seems this API can handle null
1883 // Otherwise should probably put a method that throws NSME
1884 result->obj_at_put(i, nullptr);
1885 } else {
1886 oop m;
1887 if (want_constructor) {
1888 assert(method->is_object_constructor(), "must be");
1889 m = Reflection::new_constructor(method, CHECK_NULL);
1890 } else {
1891 m = Reflection::new_method(method, false, CHECK_NULL);
1892 }
1893 result->obj_at_put(i, m);
1894 }
1895 }
1896
1897 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1898 }
1899
1900 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1901 {
1902 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1903 /*want_constructor*/ false,
1904 vmClasses::reflect_Method_klass(), THREAD);
1905 }
1906 JVM_END
1907
1908 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1909 {
1910 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1911 /*want_constructor*/ true,
1912 vmClasses::reflect_Constructor_klass(), THREAD);
1913 }
1914 JVM_END
1915
1916 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1917 {
1918 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1919 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1920 return c->has_nestmate_access_to(m, THREAD);
1921 }
1922 JVM_END
1923
1924 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1925 {
1926 // current is not a primitive or array class
1927 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1928 InstanceKlass* host = c->nest_host(THREAD);
1929 return (jclass) (host == nullptr ? nullptr :
1930 JNIHandles::make_local(THREAD, host->java_mirror()));
1931 }
1932 JVM_END
1933
1934 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1935 {
1936 // current is not a primitive or array class
1937 ResourceMark rm(THREAD);
1938 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1939 InstanceKlass* host = c->nest_host(THREAD);
1940
1941 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1942 c->external_name(), host->external_name());
1943 {
1944 JvmtiVMObjectAllocEventCollector oam;
1945 Array<u2>* members = host->nest_members();
1946 int length = members == nullptr ? 0 : members->length();
1947
1948 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1949
1950 // nest host is first in the array so make it one bigger
1951 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1952 length + 1, CHECK_NULL);
1953 objArrayHandle result(THREAD, r);
1954 result->obj_at_put(0, host->java_mirror());
1955 if (length != 0) {
1956 int count = 0;
1957 for (int i = 0; i < length; i++) {
1958 int cp_index = members->at(i);
1959 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1960 if (HAS_PENDING_EXCEPTION) {
1961 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1962 return nullptr; // propagate VMEs
1963 }
1964 if (log_is_enabled(Trace, class, nestmates)) {
1965 stringStream ss;
1966 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1967 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1968 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1969 log_trace(class, nestmates)("%s", ss.as_string());
1970 }
1971 CLEAR_PENDING_EXCEPTION;
1972 continue;
1973 }
1974 if (k->is_instance_klass()) {
1975 InstanceKlass* ik = InstanceKlass::cast(k);
1976 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1977 if (nest_host_k == host) {
1978 result->obj_at_put(count+1, k->java_mirror());
1979 count++;
1980 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1981 } else {
1982 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1983 ik->external_name(), nest_host_k->external_name());
1984 }
1985 } else {
1986 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1987 k->external_name());
1988 }
1989 }
1990 if (count < length) {
1991 // we had invalid entries so we need to compact the array
1992 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1993 length + 1, count + 1);
1994
1995 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1996 count + 1, CHECK_NULL);
1997 objArrayHandle result2(THREAD, r2);
1998 for (int i = 0; i < count + 1; i++) {
1999 result2->obj_at_put(i, result->obj_at(i));
2000 }
2001 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2002 }
2003 }
2004 else {
2005 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2006 }
2007 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2008 }
2009 }
2010 JVM_END
2011
2012 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2013 {
2014 oop mirror = JNIHandles::resolve_non_null(current);
2015 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2016 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2017
2018 ResourceMark rm(THREAD);
2019 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2020 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2021 if (ik->is_sealed()) {
2022 JvmtiVMObjectAllocEventCollector oam;
2023 Array<u2>* subclasses = ik->permitted_subclasses();
2024 int length = subclasses->length();
2025
2026 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2027
2028 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2029 length, CHECK_NULL);
2030 objArrayHandle result(THREAD, r);
2031 int count = 0;
2032 for (int i = 0; i < length; i++) {
2033 int cp_index = subclasses->at(i);
2034 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2035 if (HAS_PENDING_EXCEPTION) {
2036 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2037 return nullptr; // propagate VMEs
2038 }
2039 if (log_is_enabled(Trace, class, sealed)) {
2040 stringStream ss;
2041 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2042 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2043 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2044 log_trace(class, sealed)("%s", ss.as_string());
2045 }
2046
2047 CLEAR_PENDING_EXCEPTION;
2048 continue;
2049 }
2050 if (k->is_instance_klass()) {
2051 result->obj_at_put(count++, k->java_mirror());
2052 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2053 }
2054 }
2055 if (count < length) {
2056 // we had invalid entries so we need to compact the array
2057 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2058 count, CHECK_NULL);
2059 objArrayHandle result2(THREAD, r2);
2060 for (int i = 0; i < count; i++) {
2061 result2->obj_at_put(i, result->obj_at(i));
2062 }
2063 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2064 }
2065 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2066 } else {
2067 return nullptr;
2068 }
2069 }
2070 JVM_END
2071
2072 // Constant pool access //////////////////////////////////////////////////////////
2073
2074 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2075 {
2076 JvmtiVMObjectAllocEventCollector oam;
2077 oop mirror = JNIHandles::resolve_non_null(cls);
2078 // Return null for primitives and arrays
2079 if (!java_lang_Class::is_primitive(mirror)) {
2080 Klass* k = java_lang_Class::as_Klass(mirror);
2081 if (k->is_instance_klass()) {
2082 InstanceKlass* k_h = InstanceKlass::cast(k);
2083 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2084 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2085 return JNIHandles::make_local(THREAD, jcp());
2086 }
2087 }
2088 return nullptr;
2089 }
2090 JVM_END
2091
2092
2093 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2094 {
2095 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2096 return cp->length();
2097 }
2098 JVM_END
2099
2100
2101 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2102 {
2103 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2104 bounds_check(cp, index, CHECK_NULL);
2105 constantTag tag = cp->tag_at(index);
2106 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2107 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2108 }
2109 Klass* k = cp->klass_at(index, CHECK_NULL);
2110 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2111 }
2112 JVM_END
2113
2114 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2115 {
2116 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2117 bounds_check(cp, index, CHECK_NULL);
2118 constantTag tag = cp->tag_at(index);
2119 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2120 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2121 }
2122 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2123 if (k == nullptr) return nullptr;
2124 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2125 }
2126 JVM_END
2127
2128 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2129 constantTag tag = cp->tag_at(index);
2130 if (!tag.is_method() && !tag.is_interface_method()) {
2131 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2132 }
2133 int klass_ref = cp->uncached_klass_ref_index_at(index);
2134 Klass* k_o;
2135 if (force_resolution) {
2136 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2137 } else {
2138 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2139 if (k_o == nullptr) return nullptr;
2140 }
2141 InstanceKlass* k = InstanceKlass::cast(k_o);
2142 Symbol* name = cp->uncached_name_ref_at(index);
2143 Symbol* sig = cp->uncached_signature_ref_at(index);
2144 methodHandle m (THREAD, k->find_method(name, sig));
2145 if (m.is_null()) {
2146 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2147 }
2148 oop method;
2149 if (m->is_object_constructor()) {
2150 method = Reflection::new_constructor(m, CHECK_NULL);
2151 } else {
2152 method = Reflection::new_method(m, true, CHECK_NULL);
2153 }
2154 return JNIHandles::make_local(THREAD, method);
2155 }
2156
2157 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2158 {
2159 JvmtiVMObjectAllocEventCollector oam;
2160 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2161 bounds_check(cp, index, CHECK_NULL);
2162 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2163 return res;
2164 }
2165 JVM_END
2166
2167 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2168 {
2169 JvmtiVMObjectAllocEventCollector oam;
2170 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2171 bounds_check(cp, index, CHECK_NULL);
2172 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2173 return res;
2174 }
2175 JVM_END
2176
2177 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2178 constantTag tag = cp->tag_at(index);
2179 if (!tag.is_field()) {
2180 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2181 }
2182 int klass_ref = cp->uncached_klass_ref_index_at(index);
2183 Klass* k_o;
2184 if (force_resolution) {
2185 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2186 } else {
2187 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2188 if (k_o == nullptr) return nullptr;
2189 }
2190 InstanceKlass* k = InstanceKlass::cast(k_o);
2191 Symbol* name = cp->uncached_name_ref_at(index);
2192 Symbol* sig = cp->uncached_signature_ref_at(index);
2193 fieldDescriptor fd;
2194 Klass* target_klass = k->find_field(name, sig, &fd);
2195 if (target_klass == nullptr) {
2196 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2197 }
2198 oop field = Reflection::new_field(&fd, CHECK_NULL);
2199 return JNIHandles::make_local(THREAD, field);
2200 }
2201
2202 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2203 {
2204 JvmtiVMObjectAllocEventCollector oam;
2205 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2206 bounds_check(cp, index, CHECK_NULL);
2207 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2208 return res;
2209 }
2210 JVM_END
2211
2212 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2213 {
2214 JvmtiVMObjectAllocEventCollector oam;
2215 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2216 bounds_check(cp, index, CHECK_NULL);
2217 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2218 return res;
2219 }
2220 JVM_END
2221
2222 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2223 {
2224 JvmtiVMObjectAllocEventCollector oam;
2225 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2226 bounds_check(cp, index, CHECK_NULL);
2227 constantTag tag = cp->tag_at(index);
2228 if (!tag.is_field_or_method()) {
2229 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2230 }
2231 int klass_ref = cp->uncached_klass_ref_index_at(index);
2232 Symbol* klass_name = cp->klass_name_at(klass_ref);
2233 Symbol* member_name = cp->uncached_name_ref_at(index);
2234 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2235 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2236 objArrayHandle dest(THREAD, dest_o);
2237 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2238 dest->obj_at_put(0, str());
2239 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2240 dest->obj_at_put(1, str());
2241 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2242 dest->obj_at_put(2, str());
2243 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2244 }
2245 JVM_END
2246
2247 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2248 {
2249 JvmtiVMObjectAllocEventCollector oam;
2250 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2251 bounds_check(cp, index, CHECK_0);
2252 constantTag tag = cp->tag_at(index);
2253 if (!tag.is_field_or_method()) {
2254 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2255 }
2256 return (jint) cp->uncached_klass_ref_index_at(index);
2257 }
2258 JVM_END
2259
2260 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2261 {
2262 JvmtiVMObjectAllocEventCollector oam;
2263 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2264 bounds_check(cp, index, CHECK_0);
2265 constantTag tag = cp->tag_at(index);
2266 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2267 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2268 }
2269 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2270 }
2271 JVM_END
2272
2273 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2274 {
2275 JvmtiVMObjectAllocEventCollector oam;
2276 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2277 bounds_check(cp, index, CHECK_NULL);
2278 constantTag tag = cp->tag_at(index);
2279 if (!tag.is_name_and_type()) {
2280 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2281 }
2282 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2283 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2284 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2285 objArrayHandle dest(THREAD, dest_o);
2286 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2287 dest->obj_at_put(0, str());
2288 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2289 dest->obj_at_put(1, str());
2290 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2291 }
2292 JVM_END
2293
2294 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2295 {
2296 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2297 bounds_check(cp, index, CHECK_0);
2298 constantTag tag = cp->tag_at(index);
2299 if (!tag.is_int()) {
2300 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2301 }
2302 return cp->int_at(index);
2303 }
2304 JVM_END
2305
2306 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2307 {
2308 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2309 bounds_check(cp, index, CHECK_(0L));
2310 constantTag tag = cp->tag_at(index);
2311 if (!tag.is_long()) {
2312 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2313 }
2314 return cp->long_at(index);
2315 }
2316 JVM_END
2317
2318 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2319 {
2320 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2321 bounds_check(cp, index, CHECK_(0.0f));
2322 constantTag tag = cp->tag_at(index);
2323 if (!tag.is_float()) {
2324 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2325 }
2326 return cp->float_at(index);
2327 }
2328 JVM_END
2329
2330 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2331 {
2332 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2333 bounds_check(cp, index, CHECK_(0.0));
2334 constantTag tag = cp->tag_at(index);
2335 if (!tag.is_double()) {
2336 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2337 }
2338 return cp->double_at(index);
2339 }
2340 JVM_END
2341
2342 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2343 {
2344 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2345 bounds_check(cp, index, CHECK_NULL);
2346 constantTag tag = cp->tag_at(index);
2347 if (!tag.is_string()) {
2348 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2349 }
2350 oop str = cp->string_at(index, CHECK_NULL);
2351 return (jstring) JNIHandles::make_local(THREAD, str);
2352 }
2353 JVM_END
2354
2355 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2356 {
2357 JvmtiVMObjectAllocEventCollector oam;
2358 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2359 bounds_check(cp, index, CHECK_NULL);
2360 constantTag tag = cp->tag_at(index);
2361 if (!tag.is_symbol()) {
2362 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2363 }
2364 Symbol* sym = cp->symbol_at(index);
2365 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2366 return (jstring) JNIHandles::make_local(THREAD, str());
2367 }
2368 JVM_END
2369
2370 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2371 {
2372 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2373 bounds_check(cp, index, CHECK_0);
2374 constantTag tag = cp->tag_at(index);
2375 jbyte result = tag.value();
2376 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2377 // they are changed to the corresponding tags from the JVM spec, so that java code in
2378 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2379 if (tag.is_klass_or_reference()) {
2380 result = JVM_CONSTANT_Class;
2381 } else if (tag.is_string_index()) {
2382 result = JVM_CONSTANT_String;
2383 } else if (tag.is_method_type_in_error()) {
2384 result = JVM_CONSTANT_MethodType;
2385 } else if (tag.is_method_handle_in_error()) {
2386 result = JVM_CONSTANT_MethodHandle;
2387 } else if (tag.is_dynamic_constant_in_error()) {
2388 result = JVM_CONSTANT_Dynamic;
2389 }
2390 return result;
2391 }
2392 JVM_END
2393
2394 // Assertion support. //////////////////////////////////////////////////////////
2395
2396 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2397 assert(cls != nullptr, "bad class");
2398
2399 oop r = JNIHandles::resolve(cls);
2400 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2401 if (java_lang_Class::is_primitive(r)) return false;
2402
2403 Klass* k = java_lang_Class::as_Klass(r);
2404 assert(k->is_instance_klass(), "must be an instance klass");
2405 if (!k->is_instance_klass()) return false;
2406
2407 ResourceMark rm(THREAD);
2408 const char* name = k->name()->as_C_string();
2409 bool system_class = k->class_loader() == nullptr;
2410 return JavaAssertions::enabled(name, system_class);
2411
2412 JVM_END
2413
2414
2415 // Return a new AssertionStatusDirectives object with the fields filled in with
2416 // command-line assertion arguments (i.e., -ea, -da).
2417 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2418 JvmtiVMObjectAllocEventCollector oam;
2419 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2420 return JNIHandles::make_local(THREAD, asd);
2421 JVM_END
2422
2423 // Verification ////////////////////////////////////////////////////////////////////////////////
2424
2425 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2426
2427 // RedefineClasses support: bug 6214132 caused verification to fail.
2428 // All functions from this section, unless noted otherwise, should call the functions
2429 // get_klass_considering_redefinition(), or
2430 // get_instance_klass_considering_redefinition()
2431 // These functions return JvmtiThreadState::_scratch_class if the verifier
2432 // was invoked in the middle of the redefinition of cls.
2433 // See jvmtiThreadState.hpp for details.
2434
2435 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2436 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2437 if (k->is_instance_klass()) {
2438 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2439 } else {
2440 return k;
2441 }
2442 }
2443
2444 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2445 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2446 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2447 }
2448
2449 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2450 oop mirror = JNIHandles::resolve_non_null(cls);
2451 if (java_lang_Class::is_primitive(mirror)) {
2452 return JNI_FALSE;
2453 }
2454 Klass* k = java_lang_Class::as_Klass(mirror);
2455 // This isn't necessary since answer is the same because redefinition
2456 // has already checked this matches for the scratch class.
2457 // k = get_klass_considering_redefinition(cls, thread)
2458 jboolean result = k->is_interface();
2459 assert(!result || k->is_instance_klass(),
2460 "all interfaces are instance types");
2461 return result;
2462 JVM_END
2463
2464 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2465 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2466 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2467 return k->name()->as_utf8();
2468 JVM_END
2469
2470
2471 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2472 Klass* k = get_klass_considering_redefinition(cls, thread);
2473 // types will have length zero if this is not an InstanceKlass
2474 // (length is determined by call to JVM_GetClassCPEntriesCount)
2475 if (k->is_instance_klass()) {
2476 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2477 for (int index = cp->length() - 1; index >= 0; index--) {
2478 constantTag tag = cp->tag_at(index);
2479 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2480 }
2481 }
2482 JVM_END
2483
2484
2485 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2486 Klass* k = get_klass_considering_redefinition(cls, thread);
2487 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2488 JVM_END
2489
2490
2491 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2492 Klass* k = get_klass_considering_redefinition(cls, thread);
2493 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2494 JVM_END
2495
2496
2497 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2498 Klass* k = get_klass_considering_redefinition(cls, thread);
2499 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2500 JVM_END
2501
2502
2503 // The following methods, used for the verifier, are never called with
2504 // array klasses, so a direct cast to InstanceKlass is safe.
2505 // Typically, these methods are called in a loop with bounds determined
2506 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2507 // zero for arrays.
2508 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2509 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2510 Method* method = ik->methods()->at(method_index);
2511 int length = method->checked_exceptions_length();
2512 if (length > 0) {
2513 CheckedExceptionElement* table= method->checked_exceptions_start();
2514 for (int i = 0; i < length; i++) {
2515 exceptions[i] = table[i].class_cp_index;
2516 }
2517 }
2518 JVM_END
2519
2520
2521 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2522 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2523 Method* method = ik->methods()->at(method_index);
2524 return method->checked_exceptions_length();
2525 JVM_END
2526
2527
2528 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2529 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2530 Method* method = ik->methods()->at(method_index);
2531 memcpy(code, method->code_base(), method->code_size());
2532 JVM_END
2533
2534
2535 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2536 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2537 Method* method = ik->methods()->at(method_index);
2538 return method->code_size();
2539 JVM_END
2540
2541
2542 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2543 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2544 Method* method = ik->methods()->at(method_index);
2545 ExceptionTable extable(method);
2546 entry->start_pc = extable.start_pc(entry_index);
2547 entry->end_pc = extable.end_pc(entry_index);
2548 entry->handler_pc = extable.handler_pc(entry_index);
2549 entry->catchType = extable.catch_type_index(entry_index);
2550 JVM_END
2551
2552
2553 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2554 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2555 Method* method = ik->methods()->at(method_index);
2556 return method->exception_table_length();
2557 JVM_END
2558
2559
2560 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2561 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2562 Method* method = ik->methods()->at(method_index);
2563 return method->access_flags().as_method_flags();
2564 JVM_END
2565
2566
2567 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2568 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2569 return ik->field_access_flags(field_index);
2570 JVM_END
2571
2572
2573 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2574 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2575 Method* method = ik->methods()->at(method_index);
2576 return method->max_locals();
2577 JVM_END
2578
2579
2580 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2581 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2582 Method* method = ik->methods()->at(method_index);
2583 return method->size_of_parameters();
2584 JVM_END
2585
2586
2587 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2588 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2589 Method* method = ik->methods()->at(method_index);
2590 return method->verifier_max_stack();
2591 JVM_END
2592
2593
2594 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2595 ResourceMark rm(THREAD);
2596 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2597 Method* method = ik->methods()->at(method_index);
2598 return method->is_object_constructor();
2599 JVM_END
2600
2601
2602 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2603 ResourceMark rm(THREAD);
2604 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2605 Method* method = ik->methods()->at(method_index);
2606 return method->is_overpass();
2607 JVM_END
2608
2609 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2610 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2611 Method* method = ik->methods()->at(method_index);
2612 return method->name()->as_utf8();
2613 JVM_END
2614
2615
2616 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2617 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2618 Method* method = ik->methods()->at(method_index);
2619 return method->signature()->as_utf8();
2620 JVM_END
2621
2622 /**
2623 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2624 * read entries in the constant pool. Since the old verifier always
2625 * works on a copy of the code, it will not see any rewriting that
2626 * may possibly occur in the middle of verification. So it is important
2627 * that nothing it calls tries to use the cpCache instead of the raw
2628 * constant pool, so we must use cp->uncached_x methods when appropriate.
2629 */
2630 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2631 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2632 ConstantPool* cp = ik->constants();
2633 switch (cp->tag_at(cp_index).value()) {
2634 case JVM_CONSTANT_Fieldref:
2635 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2636 default:
2637 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2638 }
2639 ShouldNotReachHere();
2640 return nullptr;
2641 JVM_END
2642
2643
2644 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2645 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2646 ConstantPool* cp = ik->constants();
2647 switch (cp->tag_at(cp_index).value()) {
2648 case JVM_CONSTANT_InterfaceMethodref:
2649 case JVM_CONSTANT_Methodref:
2650 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2651 default:
2652 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2653 }
2654 ShouldNotReachHere();
2655 return nullptr;
2656 JVM_END
2657
2658
2659 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2660 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2661 ConstantPool* cp = ik->constants();
2662 switch (cp->tag_at(cp_index).value()) {
2663 case JVM_CONSTANT_InterfaceMethodref:
2664 case JVM_CONSTANT_Methodref:
2665 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2666 default:
2667 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2668 }
2669 ShouldNotReachHere();
2670 return nullptr;
2671 JVM_END
2672
2673
2674 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2675 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2676 ConstantPool* cp = ik->constants();
2677 switch (cp->tag_at(cp_index).value()) {
2678 case JVM_CONSTANT_Fieldref:
2679 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2680 default:
2681 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2682 }
2683 ShouldNotReachHere();
2684 return nullptr;
2685 JVM_END
2686
2687
2688 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2689 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2690 ConstantPool* cp = ik->constants();
2691 Symbol* classname = cp->klass_name_at(cp_index);
2692 return classname->as_utf8();
2693 JVM_END
2694
2695
2696 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(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_Fieldref: {
2701 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2702 Symbol* classname = cp->klass_name_at(class_index);
2703 return classname->as_utf8();
2704 }
2705 default:
2706 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2707 }
2708 ShouldNotReachHere();
2709 return nullptr;
2710 JVM_END
2711
2712
2713 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2714 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2715 ConstantPool* cp = ik->constants();
2716 switch (cp->tag_at(cp_index).value()) {
2717 case JVM_CONSTANT_Methodref:
2718 case JVM_CONSTANT_InterfaceMethodref: {
2719 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2720 Symbol* classname = cp->klass_name_at(class_index);
2721 return classname->as_utf8();
2722 }
2723 default:
2724 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2725 }
2726 ShouldNotReachHere();
2727 return nullptr;
2728 JVM_END
2729
2730
2731 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2732 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2733 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2734 ConstantPool* cp = ik->constants();
2735 ConstantPool* cp_called = ik_called->constants();
2736 switch (cp->tag_at(cp_index).value()) {
2737 case JVM_CONSTANT_Fieldref: {
2738 Symbol* name = cp->uncached_name_ref_at(cp_index);
2739 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2740 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2741 if (fs.name() == name && fs.signature() == signature) {
2742 return fs.access_flags().as_field_flags();
2743 }
2744 }
2745 return -1;
2746 }
2747 default:
2748 fatal("JVM_GetCPFieldModifiers: illegal constant");
2749 }
2750 ShouldNotReachHere();
2751 return 0;
2752 JVM_END
2753
2754
2755 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2756 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2757 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2758 ConstantPool* cp = ik->constants();
2759 switch (cp->tag_at(cp_index).value()) {
2760 case JVM_CONSTANT_Methodref:
2761 case JVM_CONSTANT_InterfaceMethodref: {
2762 Symbol* name = cp->uncached_name_ref_at(cp_index);
2763 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2764 Array<Method*>* methods = ik_called->methods();
2765 int methods_count = methods->length();
2766 for (int i = 0; i < methods_count; i++) {
2767 Method* method = methods->at(i);
2768 if (method->name() == name && method->signature() == signature) {
2769 return method->access_flags().as_method_flags();
2770 }
2771 }
2772 return -1;
2773 }
2774 default:
2775 fatal("JVM_GetCPMethodModifiers: illegal constant");
2776 }
2777 ShouldNotReachHere();
2778 return 0;
2779 JVM_END
2780
2781
2782 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2783
2784 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2785 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2786 JVM_END
2787
2788
2789 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2790 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2791 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2792 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2793 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2794 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2795 JVM_END
2796
2797 // Printing support //////////////////////////////////////////////////
2798 extern "C" {
2799
2800 ATTRIBUTE_PRINTF(3, 0)
2801 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2802 // Reject count values that are negative signed values converted to
2803 // unsigned; see bug 4399518, 4417214
2804 if ((intptr_t)count <= 0) return -1;
2805
2806 int result = os::vsnprintf(str, count, fmt, args);
2807 if (result > 0 && (size_t)result >= count) {
2808 result = -1;
2809 }
2810
2811 return result;
2812 }
2813
2814 ATTRIBUTE_PRINTF(3, 4)
2815 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2816 va_list args;
2817 int len;
2818 va_start(args, fmt);
2819 len = jio_vsnprintf(str, count, fmt, args);
2820 va_end(args);
2821 return len;
2822 }
2823
2824 ATTRIBUTE_PRINTF(2, 3)
2825 int jio_fprintf(FILE* f, const char *fmt, ...) {
2826 int len;
2827 va_list args;
2828 va_start(args, fmt);
2829 len = jio_vfprintf(f, fmt, args);
2830 va_end(args);
2831 return len;
2832 }
2833
2834 ATTRIBUTE_PRINTF(2, 0)
2835 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2836 if (Arguments::vfprintf_hook() != nullptr) {
2837 return Arguments::vfprintf_hook()(f, fmt, args);
2838 } else {
2839 return vfprintf(f, fmt, args);
2840 }
2841 }
2842
2843 ATTRIBUTE_PRINTF(1, 2)
2844 JNIEXPORT int jio_printf(const char *fmt, ...) {
2845 int len;
2846 va_list args;
2847 va_start(args, fmt);
2848 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2849 va_end(args);
2850 return len;
2851 }
2852
2853 // HotSpot specific jio method
2854 void jio_print(const char* s, size_t len) {
2855 // Try to make this function as atomic as possible.
2856 if (Arguments::vfprintf_hook() != nullptr) {
2857 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2858 } else {
2859 // Make an unused local variable to avoid warning from gcc compiler.
2860 bool dummy = os::write(defaultStream::output_fd(), s, len);
2861 }
2862 }
2863
2864 } // Extern C
2865
2866 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2867
2868 // In most of the JVM thread support functions we need to access the
2869 // thread through a ThreadsListHandle to prevent it from exiting and
2870 // being reclaimed while we try to operate on it. The exceptions to this
2871 // rule are when operating on the current thread, or if the monitor of
2872 // the target java.lang.Thread is locked at the Java level - in both
2873 // cases the target cannot exit.
2874
2875 static void thread_entry(JavaThread* thread, TRAPS) {
2876 HandleMark hm(THREAD);
2877 Handle obj(THREAD, thread->threadObj());
2878 JavaValue result(T_VOID);
2879 JavaCalls::call_virtual(&result,
2880 obj,
2881 vmClasses::Thread_klass(),
2882 vmSymbols::run_method_name(),
2883 vmSymbols::void_method_signature(),
2884 THREAD);
2885 }
2886
2887
2888 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2889 #if INCLUDE_CDS
2890 if (CDSConfig::allow_only_single_java_thread()) {
2891 // During java -Xshare:dump, if we allow multiple Java threads to
2892 // execute in parallel, symbols and classes may be loaded in
2893 // random orders which will make the resulting CDS archive
2894 // non-deterministic.
2895 //
2896 // Lucikly, during java -Xshare:dump, it's important to run only
2897 // the code in the main Java thread (which is NOT started here) that
2898 // creates the module graph, etc. It's safe to not start the other
2899 // threads which are launched by class static initializers
2900 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2901 if (log_is_enabled(Info, aot)) {
2902 ResourceMark rm;
2903 oop t = JNIHandles::resolve_non_null(jthread);
2904 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2905 }
2906 return;
2907 }
2908 #endif
2909 JavaThread *native_thread = nullptr;
2910
2911 // We cannot hold the Threads_lock when we throw an exception,
2912 // due to rank ordering issues. Example: we might need to grab the
2913 // Heap_lock while we construct the exception.
2914 bool throw_illegal_thread_state = false;
2915
2916 // We must release the Threads_lock before we can post a jvmti event
2917 // in Thread::start.
2918 {
2919 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2920 // Ensure that the C++ Thread and OSThread structures aren't freed before
2921 // we operate.
2922 MutexLocker ml(Threads_lock);
2923
2924 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2925 // re-starting an already started thread, so we should usually find
2926 // that the JavaThread is null. However for a JNI attached thread
2927 // there is a small window between the Thread object being created
2928 // (with its JavaThread set) and the update to its threadStatus, so we
2929 // have to check for this
2930 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2931 throw_illegal_thread_state = true;
2932 } else {
2933 jlong size =
2934 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2935 // Allocate the C++ Thread structure and create the native thread. The
2936 // stack size retrieved from java is 64-bit signed, but the constructor takes
2937 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2938 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2939 // - Avoid passing negative values which would result in really large stacks.
2940 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2941 size_t sz = size > 0 ? (size_t) size : 0;
2942 native_thread = new JavaThread(&thread_entry, sz);
2943
2944 // At this point it may be possible that no osthread was created for the
2945 // JavaThread due to lack of memory. Check for this situation and throw
2946 // an exception if necessary. Eventually we may want to change this so
2947 // that we only grab the lock if the thread was created successfully -
2948 // then we can also do this check and throw the exception in the
2949 // JavaThread constructor.
2950 if (native_thread->osthread() != nullptr) {
2951 // Note: the current thread is not being used within "prepare".
2952 native_thread->prepare(jthread);
2953 }
2954 }
2955 }
2956
2957 if (throw_illegal_thread_state) {
2958 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2959 }
2960
2961 assert(native_thread != nullptr, "Starting null thread?");
2962
2963 if (native_thread->osthread() == nullptr) {
2964 ResourceMark rm(thread);
2965 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2966 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2967 // No one should hold a reference to the 'native_thread'.
2968 native_thread->smr_delete();
2969 if (JvmtiExport::should_post_resource_exhausted()) {
2970 JvmtiExport::post_resource_exhausted(
2971 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2972 os::native_thread_creation_failed_msg());
2973 }
2974 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2975 os::native_thread_creation_failed_msg());
2976 }
2977
2978 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2979
2980 Thread::start(native_thread);
2981
2982 JVM_END
2983
2984
2985 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2986 ThreadsListHandle tlh(thread);
2987 oop java_thread = nullptr;
2988 JavaThread* receiver = nullptr;
2989 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2990 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2991
2992 if (is_alive) {
2993 // jthread refers to a live JavaThread.
2994 Thread::set_priority(receiver, (ThreadPriority)prio);
2995 }
2996 // Implied else: If the JavaThread hasn't started yet, then the
2997 // priority set in the java.lang.Thread object above will be pushed
2998 // down when it does start.
2999 JVM_END
3000
3001
3002 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3003 HOTSPOT_THREAD_YIELD();
3004 os::naked_yield();
3005 JVM_END
3006
3007 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3008 if (nanos < 0) {
3009 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3010 }
3011
3012 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3013 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3014 }
3015
3016 // Save current thread state and restore it at the end of this block.
3017 // And set new thread state to SLEEPING.
3018 JavaThreadSleepState jtss(thread);
3019
3020 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3021
3022 if (nanos == 0) {
3023 os::naked_yield();
3024 } else {
3025 ThreadState old_state = thread->osthread()->get_state();
3026 thread->osthread()->set_state(SLEEPING);
3027 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3028 // An asynchronous exception could have been thrown on
3029 // us while we were sleeping. We do not overwrite those.
3030 if (!HAS_PENDING_EXCEPTION) {
3031 HOTSPOT_THREAD_SLEEP_END(1);
3032 if (!thread->has_async_exception_condition()) {
3033 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3034 // to properly restore the thread state. That's likely wrong.
3035 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3036 }
3037 }
3038 }
3039 thread->osthread()->set_state(old_state);
3040 }
3041 HOTSPOT_THREAD_SLEEP_END(0);
3042 JVM_END
3043
3044 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3045 oop jthread = thread->threadObj();
3046 assert(jthread != nullptr, "no current carrier thread!");
3047 return JNIHandles::make_local(THREAD, jthread);
3048 JVM_END
3049
3050 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3051 oop theThread = thread->vthread();
3052 assert(theThread != (oop)nullptr, "no current thread!");
3053 return JNIHandles::make_local(THREAD, theThread);
3054 JVM_END
3055
3056 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3057 jobject theThread))
3058 oop threadObj = JNIHandles::resolve(theThread);
3059 thread->set_vthread(threadObj);
3060
3061 // Set _monitor_owner_id of new current Thread
3062 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3063
3064 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3065 JVM_END
3066
3067 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3068 return ThreadIdentifier::unsafe_offset();
3069 JVM_END
3070
3071 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3072 ThreadsListHandle tlh(thread);
3073 JavaThread* receiver = nullptr;
3074 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3075 if (is_alive) {
3076 // jthread refers to a live JavaThread.
3077 receiver->interrupt();
3078 }
3079 JVM_END
3080
3081 // Return true iff the current thread has locked the object passed in
3082
3083 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3084 if (obj == nullptr) {
3085 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3086 }
3087 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3088 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3089 JVM_END
3090
3091 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3092 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3093 return JNIHandles::make_local(THREAD, trace);
3094 JVM_END
3095
3096 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3097 #if INCLUDE_JVMTI
3098 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3099 return JNIHandles::make_local(THREAD, snapshot);
3100 #else
3101 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3102 #endif
3103 JVM_END
3104
3105 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3106 // We don't use a ThreadsListHandle here because the current thread
3107 // must be alive.
3108 oop java_thread = JNIHandles::resolve_non_null(jthread);
3109 JavaThread* thr = java_lang_Thread::thread(java_thread);
3110 if (thread == thr && !thr->has_attached_via_jni()) {
3111 // Thread naming is only supported for the current thread and
3112 // we don't set the name of an attached thread to avoid stepping
3113 // on other programs.
3114 ResourceMark rm(thread);
3115 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3116 os::set_native_thread_name(thread_name);
3117 }
3118 JVM_END
3119
3120 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3121 oop theCache = thread->scopedValueCache();
3122 return JNIHandles::make_local(THREAD, theCache);
3123 JVM_END
3124
3125 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3126 jobject theCache))
3127 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3128 thread->set_scopedValueCache(objs);
3129 JVM_END
3130
3131
3132 // java.lang.Package ////////////////////////////////////////////////////////////////
3133
3134
3135 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3136 ResourceMark rm(THREAD);
3137 JvmtiVMObjectAllocEventCollector oam;
3138 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3139 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3140 return (jstring) JNIHandles::make_local(THREAD, result);
3141 JVM_END
3142
3143
3144 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3145 JvmtiVMObjectAllocEventCollector oam;
3146 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3147 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3148 JVM_END
3149
3150
3151 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3152
3153
3154 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3155 MonitorLocker ml(Heap_lock);
3156 oop ref = Universe::reference_pending_list();
3157 if (ref != nullptr) {
3158 Universe::clear_reference_pending_list();
3159 }
3160 return JNIHandles::make_local(THREAD, ref);
3161 JVM_END
3162
3163 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3164 MonitorLocker ml(Heap_lock);
3165 return Universe::has_reference_pending_list();
3166 JVM_END
3167
3168 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3169 MonitorLocker ml(Heap_lock);
3170 while (!Universe::has_reference_pending_list()) {
3171 ml.wait();
3172 }
3173 JVM_END
3174
3175 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3176 oop ref_oop = JNIHandles::resolve_non_null(ref);
3177 // PhantomReference has its own implementation of get().
3178 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3179 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3180 return JNIHandles::make_local(THREAD, referent);
3181 JVM_END
3182
3183 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3184 oop ref_oop = JNIHandles::resolve_non_null(ref);
3185 // PhantomReference has its own implementation of refersTo().
3186 // See: JVM_PhantomReferenceRefersTo
3187 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3188 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3189 return referent == JNIHandles::resolve(o);
3190 JVM_END
3191
3192 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3193 oop ref_oop = JNIHandles::resolve_non_null(ref);
3194 // FinalReference has it's own implementation of clear().
3195 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3196 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3197 // If the referent has already been cleared then done.
3198 // However, if the referent is dead but has not yet been cleared by
3199 // concurrent reference processing, it should NOT be cleared here.
3200 // Instead, clearing should be left to the GC. Clearing it here could
3201 // detectably lose an expected notification, which is impossible with
3202 // STW reference processing. The clearing in enqueue() doesn't have
3203 // this problem, since the enqueue covers the notification, but it's not
3204 // worth the effort to handle that case specially.
3205 return;
3206 }
3207 java_lang_ref_Reference::clear_referent(ref_oop);
3208 JVM_END
3209
3210
3211 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3212
3213
3214 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3215 oop ref_oop = JNIHandles::resolve_non_null(ref);
3216 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3217 return referent == JNIHandles::resolve(o);
3218 JVM_END
3219
3220
3221 // ObjectInputStream ///////////////////////////////////////////////////////////////
3222
3223 // Return the first user-defined class loader up the execution stack, or null
3224 // if only code from the bootstrap or platform class loader is on the stack.
3225
3226 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3227 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3228 InstanceKlass* ik = vfst.method()->method_holder();
3229 oop loader = ik->class_loader();
3230 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3231 return JNIHandles::make_local(THREAD, loader);
3232 }
3233 }
3234 return nullptr;
3235 JVM_END
3236
3237
3238 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3239
3240
3241 // resolve array handle and check arguments
3242 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3243 if (arr == nullptr) {
3244 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3245 }
3246 oop a = JNIHandles::resolve_non_null(arr);
3247 if (!a->is_array()) {
3248 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3249 } else if (type_array_only && !a->is_typeArray()) {
3250 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3251 }
3252 return arrayOop(a);
3253 }
3254
3255
3256 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3257 arrayOop a = check_array(env, arr, false, CHECK_0);
3258 return a->length();
3259 JVM_END
3260
3261
3262 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3263 JvmtiVMObjectAllocEventCollector oam;
3264 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3265 jvalue value;
3266 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3267 oop box = Reflection::box(&value, type, CHECK_NULL);
3268 return JNIHandles::make_local(THREAD, box);
3269 JVM_END
3270
3271
3272 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3273 jvalue value;
3274 value.i = 0; // to initialize value before getting used in CHECK
3275 arrayOop a = check_array(env, arr, true, CHECK_(value));
3276 assert(a->is_typeArray(), "just checking");
3277 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3278 BasicType wide_type = (BasicType) wCode;
3279 if (type != wide_type) {
3280 Reflection::widen(&value, type, wide_type, CHECK_(value));
3281 }
3282 return value;
3283 JVM_END
3284
3285
3286 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3287 arrayOop a = check_array(env, arr, false, CHECK);
3288 oop box = JNIHandles::resolve(val);
3289 jvalue value;
3290 value.i = 0; // to initialize value before getting used in CHECK
3291 BasicType value_type;
3292 if (a->is_objArray()) {
3293 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3294 value_type = Reflection::unbox_for_regular_object(box, &value);
3295 } else {
3296 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3297 }
3298 Reflection::array_set(&value, a, index, value_type, CHECK);
3299 JVM_END
3300
3301
3302 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3303 arrayOop a = check_array(env, arr, true, CHECK);
3304 assert(a->is_typeArray(), "just checking");
3305 BasicType value_type = (BasicType) vCode;
3306 Reflection::array_set(&v, a, index, value_type, CHECK);
3307 JVM_END
3308
3309
3310 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3311 JvmtiVMObjectAllocEventCollector oam;
3312 oop element_mirror = JNIHandles::resolve(eltClass);
3313 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3314 return JNIHandles::make_local(THREAD, result);
3315 JVM_END
3316
3317
3318 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3319 JvmtiVMObjectAllocEventCollector oam;
3320 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3321 oop element_mirror = JNIHandles::resolve(eltClass);
3322 assert(dim_array->is_typeArray(), "just checking");
3323 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3324 return JNIHandles::make_local(THREAD, result);
3325 JVM_END
3326
3327
3328 // Library support ///////////////////////////////////////////////////////////////////////////
3329
3330 JVM_LEAF(void*, JVM_LoadZipLibrary())
3331 return ZipLibrary::handle();
3332 JVM_END
3333
3334 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3335 //%note jvm_ct
3336 char ebuf[1024];
3337 void *load_result;
3338 {
3339 ThreadToNativeFromVM ttnfvm(thread);
3340 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3341 }
3342 if (load_result == nullptr) {
3343 if (throwException) {
3344 char msg[1024];
3345 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3346 // Since 'ebuf' may contain a string encoded using
3347 // platform encoding scheme, we need to pass
3348 // Exceptions::unsafe_to_utf8 to the new_exception method
3349 // as the last argument. See bug 6367357.
3350 Handle h_exception =
3351 Exceptions::new_exception(thread,
3352 vmSymbols::java_lang_UnsatisfiedLinkError(),
3353 msg, Exceptions::unsafe_to_utf8);
3354
3355 THROW_HANDLE_NULL(h_exception);
3356 } else {
3357 log_info(library)("Failed to load library %s", name);
3358 return load_result;
3359 }
3360 }
3361 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3362 return load_result;
3363 JVM_END
3364
3365
3366 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3367 os::dll_unload(handle);
3368 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3369 JVM_END
3370
3371
3372 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3373 void* find_result = os::dll_lookup(handle, name);
3374 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3375 find_result != nullptr ? "Found" : "Failed to find",
3376 name, p2i(handle));
3377 return find_result;
3378 JVM_END
3379
3380
3381 // JNI version ///////////////////////////////////////////////////////////////////////////////
3382
3383 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3384 return Threads::is_supported_jni_version_including_1_1(version);
3385 JVM_END
3386
3387
3388 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3389 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3390 JVM_END
3391
3392 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3393 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3394 JVM_END
3395
3396 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3397 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3398 JVM_END
3399
3400 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3401 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3402 JVM_END
3403
3404 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3405 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3406 JVM_END
3407
3408 // String support ///////////////////////////////////////////////////////////////////////////
3409
3410 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3411 JvmtiVMObjectAllocEventCollector oam;
3412 if (str == nullptr) return nullptr;
3413 oop string = JNIHandles::resolve_non_null(str);
3414 oop result = StringTable::intern(string, CHECK_NULL);
3415 return (jstring) JNIHandles::make_local(THREAD, result);
3416 JVM_END
3417
3418
3419 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3420
3421 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3422 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3423 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3424 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3425 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3426 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3427
3428
3429 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3430 VM_Exit::block_if_vm_exited();
3431 return new PlatformMutex();
3432 }
3433
3434
3435 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3436 VM_Exit::block_if_vm_exited();
3437 delete ((PlatformMutex*) mon);
3438 }
3439
3440
3441 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3442 VM_Exit::block_if_vm_exited();
3443 ((PlatformMutex*) mon)->lock();
3444 return 0;
3445 }
3446
3447
3448 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3449 VM_Exit::block_if_vm_exited();
3450 ((PlatformMutex*) mon)->unlock();
3451 }
3452
3453
3454 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3455
3456 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3457 Handle loader, jboolean throwError, TRAPS) {
3458 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3459
3460 // Check if we should initialize the class
3461 if (init && klass->is_instance_klass()) {
3462 klass->initialize(CHECK_NULL);
3463 }
3464 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3465 }
3466
3467
3468 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3469
3470 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3471 Handle method_handle;
3472 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3473 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3474 Handle receiver(THREAD, JNIHandles::resolve(obj));
3475 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3476 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3477
3478 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3479 jobject res = JNIHandles::make_local(THREAD, result);
3480 if (JvmtiExport::should_post_vm_object_alloc()) {
3481 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3482 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3483 if (java_lang_Class::is_primitive(ret_type)) {
3484 // Only for primitive type vm allocates memory for java object.
3485 // See box() method.
3486 JvmtiExport::post_vm_object_alloc(thread, result);
3487 }
3488 }
3489 return res;
3490 } else {
3491 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3492 }
3493 JVM_END
3494
3495
3496 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3497 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3498 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3499 oop constructor_mirror = JNIHandles::resolve(c);
3500 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3501 jobject res = JNIHandles::make_local(THREAD, result);
3502 if (JvmtiExport::should_post_vm_object_alloc()) {
3503 JvmtiExport::post_vm_object_alloc(thread, result);
3504 }
3505 return res;
3506 JVM_END
3507
3508 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3510 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3511 JVM_END
3512
3513 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3514 jclass caller,
3515 jstring interfaceMethodName,
3516 jobject factoryType,
3517 jobject interfaceMethodType,
3518 jobject implementationMember,
3519 jobject dynamicMethodType,
3520 jclass lambdaProxyClass))
3521 #if INCLUDE_CDS
3522 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3523 return;
3524 }
3525
3526 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3527 if (caller_ik->is_hidden()) {
3528 // Hidden classes not of type lambda proxy classes are currently not being archived.
3529 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3530 // registered for archiving.
3531 return;
3532 }
3533 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3534 assert(lambda_ik->is_hidden(), "must be a hidden class");
3535 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3536
3537 Symbol* interface_method_name = nullptr;
3538 if (interfaceMethodName != nullptr) {
3539 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3540 }
3541 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3542 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3543
3544 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3545 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3546
3547 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3548 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3549 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3550
3551 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3552 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3553
3554 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3555 interface_method_type, m, dynamic_method_type, THREAD);
3556 #endif // INCLUDE_CDS
3557 JVM_END
3558
3559 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3560 jclass caller,
3561 jstring interfaceMethodName,
3562 jobject factoryType,
3563 jobject interfaceMethodType,
3564 jobject implementationMember,
3565 jobject dynamicMethodType))
3566 #if INCLUDE_CDS
3567
3568 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3569 implementationMember == nullptr || dynamicMethodType == nullptr) {
3570 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3571 }
3572
3573 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3574 if (!caller_ik->in_aot_cache()) {
3575 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3576 return nullptr;
3577 }
3578
3579 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3580 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3581 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3582
3583 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3584 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3585
3586 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3587 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3588 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3589
3590 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3591 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3592
3593 InstanceKlass* loaded_lambda =
3594 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3595 interface_method_type, m, dynamic_method_type,
3596 CHECK_(nullptr));
3597 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3598 #else
3599 return nullptr;
3600 #endif // INCLUDE_CDS
3601 JVM_END
3602
3603 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3604 if (CDSConfig::is_dumping_static_archive()) {
3605 // We do this so that the default CDS archive can be deterministic.
3606 const char* release = VM_Version::vm_release();
3607 const char* dbg_level = VM_Version::jdk_debug_level();
3608 const char* version = VM_Version::internal_vm_info_string();
3609 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3610 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3611 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3612 seed += (jlong)VM_Version::vm_major_version();
3613 seed += (jlong)VM_Version::vm_minor_version();
3614 seed += (jlong)VM_Version::vm_security_version();
3615 seed += (jlong)VM_Version::vm_patch_version();
3616 if (seed == 0) { // don't let this ever be zero.
3617 seed = 0x87654321;
3618 }
3619 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3620 return seed;
3621 } else {
3622 return 0;
3623 }
3624 JVM_END
3625
3626 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3627 return CDSConfig::get_status();
3628 JVM_END
3629
3630 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3631 #if INCLUDE_CDS
3632 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3633 if (line != nullptr) {
3634 ResourceMark rm(THREAD);
3635 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3636 char* c_line = java_lang_String::as_utf8_string(h_line());
3637 if (CDSConfig::is_dumping_dynamic_archive()) {
3638 // Note: LambdaFormInvokers::append take same format which is not
3639 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3640 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3641 }
3642 if (ClassListWriter::is_enabled()) {
3643 ClassListWriter w;
3644 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3645 }
3646 }
3647 #endif // INCLUDE_CDS
3648 JVM_END
3649
3650 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3651 #if INCLUDE_CDS
3652 ResourceMark rm(THREAD);
3653 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3654 char* file_name = java_lang_String::as_utf8_string(file_handle());
3655 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3656 #endif // INCLUDE_CDS
3657 JVM_END
3658
3659 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3660 #if INCLUDE_CDS
3661 ResourceMark rm(THREAD);
3662 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3663 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3664 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3665 #endif // INCLUDE_CDS
3666 JVM_END
3667
3668 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3669 #if INCLUDE_CDS
3670 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3671 if (!k->is_instance_klass()) {
3672 return false;
3673 } else {
3674 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3675 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3676 // This class will be cached in AOT-initialized state. No need for init barriers.
3677 return false;
3678 } else {
3679 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3680 // must emit barriers to ensure class initialization during production run.
3681 ResourceMark rm(THREAD);
3682 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3683 return true;
3684 }
3685 }
3686 #else
3687 return false;
3688 #endif // INCLUDE_CDS
3689 JVM_END
3690
3691 // Returns an array of all live Thread objects (VM internal JavaThreads,
3692 // jvmti agent threads, and JNI attaching threads are skipped)
3693 // See CR 6404306 regarding JNI attaching threads
3694 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3695 ResourceMark rm(THREAD);
3696 ThreadsListEnumerator tle(THREAD, false, false);
3697 JvmtiVMObjectAllocEventCollector oam;
3698
3699 int num_threads = tle.num_threads();
3700 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3701 objArrayHandle threads_ah(THREAD, r);
3702
3703 for (int i = 0; i < num_threads; i++) {
3704 Handle h = tle.get_threadObj(i);
3705 threads_ah->obj_at_put(i, h());
3706 }
3707
3708 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3709 JVM_END
3710
3711
3712 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3713 // Return StackTraceElement[][], each element is the stack trace of a thread in
3714 // the corresponding entry in the given threads array
3715 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3716 JvmtiVMObjectAllocEventCollector oam;
3717
3718 // Check if threads is null
3719 if (threads == nullptr) {
3720 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3721 }
3722
3723 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3724 objArrayHandle ah(THREAD, a);
3725 int num_threads = ah->length();
3726 // check if threads is non-empty array
3727 if (num_threads == 0) {
3728 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3729 }
3730
3731 // check if threads is not an array of objects of Thread class
3732 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3733 if (k != vmClasses::Thread_klass()) {
3734 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3735 }
3736 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3737
3738 ResourceMark rm(THREAD);
3739
3740 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3741 for (int i = 0; i < num_threads; i++) {
3742 oop thread_obj = rah->obj_at(i);
3743 instanceHandle h(THREAD, (instanceOop) thread_obj);
3744 thread_handle_array->append(h);
3745 }
3746
3747 // The JavaThread references in thread_handle_array are validated
3748 // in VM_ThreadDump::doit().
3749 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3750 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3751
3752 JVM_END
3753
3754 // JVM monitoring and management support
3755 JVM_LEAF(void*, JVM_GetManagement(jint version))
3756 return Management::get_jmm_interface(version);
3757 JVM_END
3758
3759 // com.sun.tools.attach.VirtualMachine agent properties support
3760 //
3761 // Initialize the agent properties with the properties maintained in the VM
3762 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3763 ResourceMark rm;
3764
3765 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3766
3767 PUTPROP(props, "sun.java.command", Arguments::java_command());
3768 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3769 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3770 return properties;
3771 JVM_END
3772
3773 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3774 {
3775 JvmtiVMObjectAllocEventCollector oam;
3776
3777 if (ofClass == nullptr) {
3778 return nullptr;
3779 }
3780 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3781 // Special handling for primitive objects
3782 if (java_lang_Class::is_primitive(mirror())) {
3783 return nullptr;
3784 }
3785 Klass* k = java_lang_Class::as_Klass(mirror());
3786 if (!k->is_instance_klass()) {
3787 return nullptr;
3788 }
3789 InstanceKlass* ik = InstanceKlass::cast(k);
3790 int encl_method_class_idx = ik->enclosing_method_class_index();
3791 if (encl_method_class_idx == 0) {
3792 return nullptr;
3793 }
3794 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3795 objArrayHandle dest(THREAD, dest_o);
3796 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3797 dest->obj_at_put(0, enc_k->java_mirror());
3798 int encl_method_method_idx = ik->enclosing_method_method_index();
3799 if (encl_method_method_idx != 0) {
3800 Symbol* sym = ik->constants()->symbol_at(
3801 extract_low_short_from_int(
3802 ik->constants()->name_and_type_at(encl_method_method_idx)));
3803 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3804 dest->obj_at_put(1, str());
3805 sym = ik->constants()->symbol_at(
3806 extract_high_short_from_int(
3807 ik->constants()->name_and_type_at(encl_method_method_idx)));
3808 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3809 dest->obj_at_put(2, str());
3810 }
3811 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3812 }
3813 JVM_END
3814
3815 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3816 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3817 ResourceMark rm(THREAD);
3818
3819 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3820 return nullptr;
3821 }
3822
3823 char** vm_flags = Arguments::jvm_flags_array();
3824 char** vm_args = Arguments::jvm_args_array();
3825 int num_flags = Arguments::num_jvm_flags();
3826 int num_args = Arguments::num_jvm_args();
3827
3828 InstanceKlass* ik = vmClasses::String_klass();
3829 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3830 objArrayHandle result_h(THREAD, r);
3831
3832 int index = 0;
3833 for (int j = 0; j < num_flags; j++, index++) {
3834 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3835 result_h->obj_at_put(index, h());
3836 }
3837 for (int i = 0; i < num_args; i++, index++) {
3838 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3839 result_h->obj_at_put(index, h());
3840 }
3841 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3842 JVM_END
3843
3844 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3845 return os::get_signal_number(name);
3846 JVM_END
3847
3848 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3849 #if INCLUDE_JVMTI
3850 if (!DoJVMTIVirtualThreadTransitions) {
3851 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3852 return;
3853 }
3854 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3855 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3856 } else {
3857 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3858 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3859 }
3860 #endif
3861 JVM_END
3862
3863 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3864 #if INCLUDE_JVMTI
3865 if (!DoJVMTIVirtualThreadTransitions) {
3866 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3867 return;
3868 }
3869 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3870 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3871 } else {
3872 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3873 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3874 }
3875 #endif
3876 JVM_END
3877
3878 // If notifications are disabled then just update the VTMS transition bit and return.
3879 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3880 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3881 #if INCLUDE_JVMTI
3882 if (!DoJVMTIVirtualThreadTransitions) {
3883 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3884 return;
3885 }
3886 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3887 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3888 } else {
3889 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3890 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3891 }
3892 #endif
3893 JVM_END
3894
3895 // If notifications are disabled then just update the VTMS transition bit and return.
3896 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3897 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3898 #if INCLUDE_JVMTI
3899 if (!DoJVMTIVirtualThreadTransitions) {
3900 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3901 return;
3902 }
3903 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3904 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3905 } else {
3906 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3907 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3908 }
3909 #endif
3910 JVM_END
3911
3912 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3913 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3914 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3915 #if INCLUDE_JVMTI
3916 if (!DoJVMTIVirtualThreadTransitions) {
3917 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3918 return;
3919 }
3920 assert(thread->is_disable_suspend() != (bool)enter,
3921 "nested or unbalanced monitor enter/exit is not allowed");
3922 thread->toggle_is_disable_suspend();
3923 #endif
3924 JVM_END
3925
3926 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3927 #if INCLUDE_JFR
3928 freeze_result result = THREAD->last_freeze_fail_result();
3929 assert(result != freeze_ok, "sanity check");
3930 EventVirtualThreadPinned event(UNTIMED);
3931 event.set_starttime(THREAD->last_freeze_fail_time());
3932 if (event.should_commit()) {
3933 ResourceMark rm(THREAD);
3934 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3935 THREAD->post_vthread_pinned_event(&event, str, result);
3936 }
3937 #endif
3938 JVM_END
3939
3940 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3941 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3942 assert(parkEvent != nullptr, "not initialized");
3943
3944 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3945 oop vthread_head = nullptr;
3946 while (true) {
3947 if (list_head.peek() != nullptr) {
3948 for (;;) {
3949 oop head = list_head.resolve();
3950 if (list_head.cmpxchg(head, nullptr) == head) {
3951 return JNIHandles::make_local(THREAD, head);
3952 }
3953 }
3954 }
3955 ThreadBlockInVM tbivm(THREAD);
3956 parkEvent->park();
3957 }
3958 JVM_END
3959 /*
3960 * Return the current class's class file version. The low order 16 bits of the
3961 * returned jint contain the class's major version. The high order 16 bits
3962 * contain the class's minor version.
3963 */
3964 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3965 oop mirror = JNIHandles::resolve_non_null(current);
3966 if (java_lang_Class::is_primitive(mirror)) {
3967 // return latest major version and minor version of 0.
3968 return JVM_CLASSFILE_MAJOR_VERSION;
3969 }
3970 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3971 return (ik->minor_version() << 16) | ik->major_version();
3972 JVM_END
3973
3974 /*
3975 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3976 * get the value will see a materialized value and not a scalar-replaced
3977 * null value.
3978 */
3979 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3980 JVM_EnsureMaterializedForStackWalk(env, value);
3981 JVM_END
3982
3983 /*
3984 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3985 */
3986 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3987 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3988 JVM_END