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