1 /*
2 * Copyright (c) 1997, 2024, 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 "precompiled.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "cds/classListParser.hpp"
28 #include "cds/classListWriter.hpp"
29 #include "cds/dynamicArchive.hpp"
30 #include "cds/heapShared.hpp"
31 #include "cds/lambdaFormInvokers.hpp"
32 #include "classfile/classFileStream.hpp"
33 #include "classfile/classLoader.inline.hpp"
34 #include "classfile/classLoaderData.hpp"
35 #include "classfile/classLoaderData.inline.hpp"
36 #include "classfile/classLoadInfo.hpp"
37 #include "classfile/javaAssertions.hpp"
38 #include "classfile/javaClasses.inline.hpp"
39 #include "classfile/moduleEntry.hpp"
40 #include "classfile/modules.hpp"
41 #include "classfile/packageEntry.hpp"
42 #include "classfile/stringTable.hpp"
43 #include "classfile/symbolTable.hpp"
44 #include "classfile/systemDictionary.hpp"
45 #include "classfile/vmClasses.hpp"
46 #include "classfile/vmSymbols.hpp"
47 #include "gc/shared/collectedHeap.inline.hpp"
48 #include "interpreter/bytecode.hpp"
49 #include "interpreter/bytecodeUtils.hpp"
50 #include "jfr/jfrEvents.hpp"
51 #include "jvm.h"
52 #include "logging/log.hpp"
53 #include "memory/oopFactory.hpp"
54 #include "memory/referenceType.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/access.inline.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/fieldStreams.inline.hpp"
60 #include "oops/flatArrayKlass.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/method.hpp"
64 #include "oops/recordComponent.hpp"
65 #include "oops/objArrayKlass.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/oop.inline.hpp"
68 #include "prims/foreignGlobals.hpp"
69 #include "prims/jvm_misc.hpp"
70 #include "prims/jvmtiExport.hpp"
71 #include "prims/jvmtiThreadState.inline.hpp"
72 #include "prims/stackwalk.hpp"
73 #include "runtime/arguments.hpp"
74 #include "runtime/atomic.hpp"
75 #include "runtime/continuation.hpp"
76 #include "runtime/globals_extension.hpp"
77 #include "runtime/handles.inline.hpp"
78 #include "runtime/init.hpp"
79 #include "runtime/interfaceSupport.inline.hpp"
80 #include "runtime/deoptimization.hpp"
81 #include "runtime/handshake.hpp"
82 #include "runtime/java.hpp"
83 #include "runtime/javaCalls.hpp"
84 #include "runtime/javaThread.hpp"
85 #include "runtime/jfieldIDWorkaround.hpp"
86 #include "runtime/jniHandles.inline.hpp"
87 #include "runtime/os.inline.hpp"
88 #include "runtime/osThread.hpp"
89 #include "runtime/perfData.hpp"
90 #include "runtime/reflection.hpp"
91 #include "runtime/synchronizer.hpp"
92 #include "runtime/threadIdentifier.hpp"
93 #include "runtime/threadSMR.hpp"
94 #include "runtime/vframe.inline.hpp"
95 #include "runtime/vmOperations.hpp"
96 #include "runtime/vm_version.hpp"
97 #include "services/attachListener.hpp"
98 #include "services/management.hpp"
99 #include "services/threadService.hpp"
100 #include "utilities/checkedCast.hpp"
101 #include "utilities/copy.hpp"
102 #include "utilities/defaultStream.hpp"
103 #include "utilities/dtrace.hpp"
104 #include "utilities/events.hpp"
105 #include "utilities/macros.hpp"
106 #include "utilities/utf8.hpp"
107 #include "utilities/zipLibrary.hpp"
108 #if INCLUDE_CDS
109 #include "classfile/systemDictionaryShared.hpp"
110 #endif
111 #if INCLUDE_JFR
112 #include "jfr/jfr.hpp"
113 #endif
114 #if INCLUDE_MANAGEMENT
115 #include "services/finalizerService.hpp"
116 #endif
117 #ifdef LINUX
118 #include "osContainer_linux.hpp"
119 #endif
120
121 #include <errno.h>
122
123 /*
124 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
125 such ctors and calls MUST NOT come between an oop declaration/init and its
126 usage because if objects are move this may cause various memory stomps, bus
127 errors and segfaults. Here is a cookbook for causing so called "naked oop
128 failures":
129
130 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
131 // Object address to be held directly in mirror & not visible to GC
132 oop mirror = JNIHandles::resolve_non_null(ofClass);
133
134 // If this ctor can hit a safepoint, moving objects around, then
135 ComplexConstructor foo;
136
137 // Boom! mirror may point to JUNK instead of the intended object
138 (some dereference of mirror)
139
140 // Here's another call that may block for GC, making mirror stale
141 MutexLocker ml(some_lock);
142
143 // And here's an initializer that can result in a stale oop
144 // all in one step.
145 oop o = call_that_can_throw_exception(TRAPS);
146
147
148 The solution is to keep the oop declaration BELOW the ctor or function
149 call that might cause a GC, do another resolve to reassign the oop, or
150 consider use of a Handle instead of an oop so there is immunity from object
151 motion. But note that the "QUICK" entries below do not have a handlemark
152 and thus can only support use of handles passed in.
153 */
154
155 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
156 ResourceMark rm;
157 int line_number = -1;
158 const char * source_file = nullptr;
159 const char * trace = "explicit";
160 InstanceKlass* caller = nullptr;
161 JavaThread* jthread = THREAD;
162 if (jthread->has_last_Java_frame()) {
163 vframeStream vfst(jthread);
164
165 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
166 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
167 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
168 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
169 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
170
171 Method* last_caller = nullptr;
172
173 while (!vfst.at_end()) {
174 Method* m = vfst.method();
175 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
176 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
177 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
178 break;
179 }
180 last_caller = m;
181 vfst.next();
182 }
183 // if this is called from Class.forName0 and that is called from Class.forName,
184 // then print the caller of Class.forName. If this is Class.loadClass, then print
185 // that caller, otherwise keep quiet since this should be picked up elsewhere.
186 bool found_it = false;
187 if (!vfst.at_end() &&
188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
189 vfst.method()->name() == vmSymbols::forName0_name()) {
190 vfst.next();
191 if (!vfst.at_end() &&
192 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
193 vfst.method()->name() == vmSymbols::forName_name()) {
194 vfst.next();
195 found_it = true;
196 }
197 } else if (last_caller != nullptr &&
198 last_caller->method_holder()->name() ==
199 vmSymbols::java_lang_ClassLoader() &&
200 last_caller->name() == vmSymbols::loadClass_name()) {
201 found_it = true;
202 } else if (!vfst.at_end()) {
203 if (vfst.method()->is_native()) {
204 // JNI call
205 found_it = true;
206 }
207 }
208 if (found_it && !vfst.at_end()) {
209 // found the caller
210 caller = vfst.method()->method_holder();
211 line_number = vfst.method()->line_number_from_bci(vfst.bci());
212 if (line_number == -1) {
213 // show method name if it's a native method
214 trace = vfst.method()->name_and_sig_as_C_string();
215 }
216 Symbol* s = caller->source_file_name();
217 if (s != nullptr) {
218 source_file = s->as_C_string();
219 }
220 }
221 }
222 if (caller != nullptr) {
223 if (to_class != caller) {
224 const char * from = caller->external_name();
225 const char * to = to_class->external_name();
226 // print in a single call to reduce interleaving between threads
227 if (source_file != nullptr) {
228 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
229 } else {
230 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
231 }
232 }
233 }
234 }
235
236 void trace_class_resolution(Klass* to_class) {
237 EXCEPTION_MARK;
238 trace_class_resolution_impl(to_class, THREAD);
239 if (HAS_PENDING_EXCEPTION) {
240 CLEAR_PENDING_EXCEPTION;
241 }
242 }
243
244 // java.lang.System //////////////////////////////////////////////////////////////////////
245
246
247 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
248 return os::javaTimeMillis();
249 JVM_END
250
251 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
252 return os::javaTimeNanos();
253 JVM_END
254
255 // The function below is actually exposed by jdk.internal.misc.VM and not
256 // java.lang.System, but we choose to keep it here so that it stays next
257 // to JVM_CurrentTimeMillis and JVM_NanoTime
258
259 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
260 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
261
262 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
263 jlong seconds;
264 jlong nanos;
265
266 os::javaTimeSystemUTC(seconds, nanos);
267
268 // We're going to verify that the result can fit in a long.
269 // For that we need the difference in seconds between 'seconds'
270 // and 'offset_secs' to be such that:
271 // |seconds - offset_secs| < (2^63/10^9)
272 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
273 // which makes |seconds - offset_secs| < 2^33
274 // and we will prefer +/- 2^32 as the maximum acceptable diff
275 // as 2^32 has a more natural feel than 2^33...
276 //
277 // So if |seconds - offset_secs| >= 2^32 - we return a special
278 // sentinel value (-1) which the caller should take as an
279 // exception value indicating that the offset given to us is
280 // too far from range of the current time - leading to too big
281 // a nano adjustment. The caller is expected to recover by
282 // computing a more accurate offset and calling this method
283 // again. (For the record 2^32 secs is ~136 years, so that
284 // should rarely happen)
285 //
286 jlong diff = seconds - offset_secs;
287 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
288 return -1; // sentinel value: the offset is too far off the target
289 }
290
291 // return the adjustment. If you compute a time by adding
292 // this number of nanoseconds along with the number of seconds
293 // in the offset you should get the current UTC time.
294 return (diff * (jlong)1000000000) + nanos;
295 JVM_END
296
297 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
298 jobject dst, jint dst_pos, jint length))
299 // Check if we have null pointers
300 if (src == nullptr || dst == nullptr) {
301 THROW(vmSymbols::java_lang_NullPointerException());
302 }
303 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
304 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
305 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
306 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
307 // Do copy
308 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
309 JVM_END
310
311
312 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
313 JavaValue r(T_OBJECT);
314 // public synchronized Object put(Object key, Object value);
315 HandleMark hm(THREAD);
316 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
317 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
318 JavaCalls::call_virtual(&r,
319 props,
320 vmClasses::Properties_klass(),
321 vmSymbols::put_name(),
322 vmSymbols::object_object_object_signature(),
323 key_str,
324 value_str,
325 THREAD);
326 }
327
328
329 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
330
331 /*
332 * Return all of the system properties in a Java String array with alternating
333 * names and values from the jvm SystemProperty.
334 * Which includes some internal and all commandline -D defined properties.
335 */
336 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
337 ResourceMark rm(THREAD);
338 HandleMark hm(THREAD);
339 int ndx = 0;
340 int fixedCount = 2;
341
342 SystemProperty* p = Arguments::system_properties();
343 int count = Arguments::PropertyList_count(p);
344
345 // Allocate result String array
346 InstanceKlass* ik = vmClasses::String_klass();
347 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
348 objArrayHandle result_h(THREAD, r);
349
350 while (p != nullptr) {
351 const char * key = p->key();
352 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
353 const char * value = p->value();
354 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
355 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
356 result_h->obj_at_put(ndx * 2, key_str());
357 result_h->obj_at_put(ndx * 2 + 1, value_str());
358 ndx++;
359 }
360 p = p->next();
361 }
362
363 // Convert the -XX:MaxDirectMemorySize= command line flag
364 // to the sun.nio.MaxDirectMemorySize property.
365 // Do this after setting user properties to prevent people
366 // from setting the value with a -D option, as requested.
367 // Leave empty if not supplied
368 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
369 char as_chars[256];
370 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
371 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
372 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
373 result_h->obj_at_put(ndx * 2, key_str());
374 result_h->obj_at_put(ndx * 2 + 1, value_str());
375 ndx++;
376 }
377
378 // JVM monitoring and management support
379 // Add the sun.management.compiler property for the compiler's name
380 {
381 #undef CSIZE
382 #if defined(_LP64) || defined(_WIN64)
383 #define CSIZE "64-Bit "
384 #else
385 #define CSIZE
386 #endif // 64bit
387
388 #if COMPILER1_AND_COMPILER2
389 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
390 #else
391 #if defined(COMPILER1)
392 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
393 #elif defined(COMPILER2)
394 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
395 #elif INCLUDE_JVMCI
396 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
397 #else
398 const char* compiler_name = "";
399 #endif // compilers
400 #endif // COMPILER1_AND_COMPILER2
401
402 if (*compiler_name != '\0' &&
403 (Arguments::mode() != Arguments::_int)) {
404 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
405 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
406 result_h->obj_at_put(ndx * 2, key_str());
407 result_h->obj_at_put(ndx * 2 + 1, value_str());
408 ndx++;
409 }
410 }
411
412 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
413 JVM_END
414
415
416 /*
417 * Return the temporary directory that the VM uses for the attach
418 * and perf data files.
419 *
420 * It is important that this directory is well-known and the
421 * same for all VM instances. It cannot be affected by configuration
422 * variables such as java.io.tmpdir.
423 */
424 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
425 HandleMark hm(THREAD);
426 const char* temp_dir = os::get_temp_directory();
427 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
428 return (jstring) JNIHandles::make_local(THREAD, h());
429 JVM_END
430
431 JVM_ENTRY(jarray, JVM_NewNullRestrictedArray(JNIEnv *env, jclass elmClass, jint len))
432 if (len < 0) {
433 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
434 }
435 oop mirror = JNIHandles::resolve_non_null(elmClass);
436 Klass* klass = java_lang_Class::as_Klass(mirror);
437 klass->initialize(CHECK_NULL);
438 if (klass->is_identity_class()) {
439 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
440 }
441 InstanceKlass* ik = InstanceKlass::cast(klass);
442 if (!ik->is_implicitly_constructible()) {
443 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not implicitly constructible");
444 }
445 oop array = oopFactory::new_valueArray(ik, len, CHECK_NULL);
446 return (jarray) JNIHandles::make_local(THREAD, array);
447 JVM_END
448
449
450 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
451 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
452 return oop->is_null_free_array();
453 JVM_END
454
455 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
456
457 extern volatile jint vm_created;
458
459 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
460 EventShutdown event;
461 if (event.should_commit()) {
462 event.set_reason("Shutdown requested from Java");
463 event.commit();
464 }
465 JVM_END
466
467
468 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
469 before_exit(thread, true);
470 vm_exit(code);
471 JVM_END
472
473
474 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
475 if (!DisableExplicitGC) {
476 EventSystemGC event;
477 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
478 Universe::heap()->collect(GCCause::_java_lang_system_gc);
479 event.commit();
480 }
481 JVM_END
482
483
484 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
485 return Universe::heap()->millis_since_last_whole_heap_examined();
486 JVM_END
487
488
489 static inline jlong convert_size_t_to_jlong(size_t val) {
490 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
491 NOT_LP64 (return (jlong)val;)
492 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
493 }
494
495 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
496 size_t n = Universe::heap()->capacity();
497 return convert_size_t_to_jlong(n);
498 JVM_END
499
500
501 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
502 size_t n = Universe::heap()->unused();
503 return convert_size_t_to_jlong(n);
504 JVM_END
505
506
507 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
508 size_t n = Universe::heap()->max_capacity();
509 return convert_size_t_to_jlong(n);
510 JVM_END
511
512
513 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
514 return os::active_processor_count();
515 JVM_END
516
517 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
518 #ifdef LINUX
519 if (UseContainerSupport) {
520 return JNI_TRUE;
521 }
522 #endif
523 return JNI_FALSE;
524 JVM_END
525
526 JVM_LEAF(jboolean, JVM_IsContainerized(void))
527 #ifdef LINUX
528 if (OSContainer::is_containerized()) {
529 return JNI_TRUE;
530 }
531 #endif
532 return JNI_FALSE;
533 JVM_END
534
535 // java.lang.Throwable //////////////////////////////////////////////////////
536
537 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
538 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
539 java_lang_Throwable::fill_in_stack_trace(exception);
540 JVM_END
541
542 // java.lang.NullPointerException ///////////////////////////////////////////
543
544 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
545 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
546
547 oop exc = JNIHandles::resolve_non_null(throwable);
548
549 Method* method;
550 int bci;
551 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
552 return nullptr;
553 }
554 if (method->is_native()) {
555 return nullptr;
556 }
557
558 stringStream ss;
559 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
560 if (ok) {
561 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
562 return (jstring) JNIHandles::make_local(THREAD, result);
563 } else {
564 return nullptr;
565 }
566 JVM_END
567
568 // java.lang.StackTraceElement //////////////////////////////////////////////
569
570
571 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
572 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
573 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
574 objArrayHandle stack_trace(THREAD, st);
575 // Fill in the allocated stack trace
576 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
577 JVM_END
578
579
580 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
581 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
582 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
583 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
584 JVM_END
585
586
587 // java.lang.StackWalker //////////////////////////////////////////////////////
588 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
589 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
590
591 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
592 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
593 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
594 if (!have_name) {
595 oop name = StringTable::intern(method->name(), CHECK);
596 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
597 }
598 if (!have_type) {
599 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
600 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
601 }
602 JVM_END
603
604 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
605 jint skip_frames, jobject contScope, jobject cont,
606 jint buffer_size, jint start_index, jobjectArray frames))
607 if (!thread->has_last_Java_frame()) {
608 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
609 }
610
611 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
612 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
613 Handle cont_h(THREAD, JNIHandles::resolve(cont));
614 // frames array is a ClassFrameInfo[] array when only getting caller reference,
615 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
616 // be null.
617 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
618 objArrayHandle frames_array_h(THREAD, fa);
619
620 if (frames_array_h->length() < buffer_size) {
621 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
622 }
623
624 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
625 buffer_size, start_index, frames_array_h, CHECK_NULL);
626 return JNIHandles::make_local(THREAD, result);
627 JVM_END
628
629
630 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
631 jint last_batch_count, jint buffer_size, jint start_index,
632 jobjectArray frames))
633 // frames array is a ClassFrameInfo[] array when only getting caller reference,
634 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
635 // be null.
636 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
637 objArrayHandle frames_array_h(THREAD, fa);
638
639 if (frames_array_h->length() < buffer_size) {
640 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
641 }
642
643 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
644 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
645 start_index, frames_array_h, THREAD);
646 JVM_END
647
648 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
649 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
650 objArrayHandle frames_array_h(THREAD, fa);
651 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
652 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
653
654 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
655 JVM_END
656
657 // java.lang.Object ///////////////////////////////////////////////
658
659
660 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
661 // as implemented in the classic virtual machine; return 0 if object is null
662 if (handle == nullptr) {
663 return 0;
664 }
665 oop obj = JNIHandles::resolve_non_null(handle);
666 if (EnableValhalla && obj->klass()->is_inline_klass()) {
667 JavaValue result(T_INT);
668 JavaCallArguments args;
669 Handle ho(THREAD, obj);
670 args.push_oop(ho);
671 methodHandle method(THREAD, Universe::value_object_hash_code_method());
672 JavaCalls::call(&result, method, &args, THREAD);
673 if (HAS_PENDING_EXCEPTION) {
674 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
675 Handle e(THREAD, PENDING_EXCEPTION);
676 CLEAR_PENDING_EXCEPTION;
677 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
678 }
679 }
680 return result.get_jint();
681 } else {
682 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
683 }
684 JVM_END
685
686
687 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
688 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
689 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
690 if (JvmtiExport::should_post_monitor_wait()) {
691 JvmtiExport::post_monitor_wait(thread, obj(), ms);
692
693 // The current thread already owns the monitor and it has not yet
694 // been added to the wait queue so the current thread cannot be
695 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
696 // event handler cannot accidentally consume an unpark() meant for
697 // the ParkEvent associated with this ObjectMonitor.
698 }
699 ObjectSynchronizer::wait(obj, ms, CHECK);
700 JVM_END
701
702
703 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
704 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
705 ObjectSynchronizer::notify(obj, CHECK);
706 JVM_END
707
708
709 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
710 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
711 ObjectSynchronizer::notifyall(obj, CHECK);
712 JVM_END
713
714
715 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
716 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
717 Klass* klass = obj->klass();
718 JvmtiVMObjectAllocEventCollector oam;
719
720 #ifdef ASSERT
721 // Just checking that the cloneable flag is set correct
722 if (obj->is_array()) {
723 guarantee(klass->is_cloneable(), "all arrays are cloneable");
724 } else {
725 guarantee(obj->is_instance(), "should be instanceOop");
726 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
727 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
728 }
729 #endif
730
731 // Check if class of obj supports the Cloneable interface.
732 // All arrays are considered to be cloneable (See JLS 20.1.5).
733 // All j.l.r.Reference classes are considered non-cloneable.
734 if (!klass->is_cloneable() ||
735 (klass->is_instance_klass() &&
736 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
737 ResourceMark rm(THREAD);
738 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
739 }
740
741 if (klass->is_inline_klass()) {
742 // Value instances have no identity, so return the current instance instead of allocating a new one
743 // Value classes cannot have finalizers, so the method can return immediately
744 return JNIHandles::make_local(THREAD, obj());
745 }
746
747 // Make shallow object copy
748 const size_t size = obj->size();
749 oop new_obj_oop = nullptr;
750 if (obj->is_array()) {
751 const int length = ((arrayOop)obj())->length();
752 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
753 /* do_zero */ true, CHECK_NULL);
754 } else {
755 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
756 }
757
758 HeapAccess<>::clone(obj(), new_obj_oop, size);
759
760 Handle new_obj(THREAD, new_obj_oop);
761 // Caution: this involves a java upcall, so the clone should be
762 // "gc-robust" by this stage.
763 if (klass->has_finalizer()) {
764 assert(obj->is_instance(), "should be instanceOop");
765 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
766 new_obj = Handle(THREAD, new_obj_oop);
767 }
768
769 return JNIHandles::make_local(THREAD, new_obj());
770 JVM_END
771
772 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
773
774 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
775 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
776 JVM_END
777
778 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
779 return InstanceKlass::is_finalization_enabled();
780 JVM_END
781
782 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
783
784 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
785 CONT_RegisterNativeMethods(env, cls);
786 JVM_END
787
788 // java.io.File ///////////////////////////////////////////////////////////////
789
790 JVM_LEAF(char*, JVM_NativePath(char* path))
791 return os::native_path(path);
792 JVM_END
793
794
795 // Misc. class handling ///////////////////////////////////////////////////////////
796
797
798 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
799 // Getting the class of the caller frame.
800 //
801 // The call stack at this point looks something like this:
802 //
803 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
804 // [1] [ @CallerSensitive API.method ]
805 // [.] [ (skipped intermediate frames) ]
806 // [n] [ caller ]
807 vframeStream vfst(thread);
808 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
809 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
810 Method* m = vfst.method();
811 assert(m != nullptr, "sanity");
812 switch (n) {
813 case 0:
814 // This must only be called from Reflection.getCallerClass
815 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
816 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
817 }
818 // fall-through
819 case 1:
820 // Frame 0 and 1 must be caller sensitive.
821 if (!m->caller_sensitive()) {
822 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
823 }
824 break;
825 default:
826 if (!m->is_ignored_by_security_stack_walk()) {
827 // We have reached the desired frame; return the holder class.
828 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
829 }
830 break;
831 }
832 }
833 return nullptr;
834 JVM_END
835
836
837 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
838 oop mirror = nullptr;
839 BasicType t = name2type(utf);
840 if (t != T_ILLEGAL && !is_reference_type(t)) {
841 mirror = Universe::java_mirror(t);
842 }
843 if (mirror == nullptr) {
844 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
845 } else {
846 return (jclass) JNIHandles::make_local(THREAD, mirror);
847 }
848 JVM_END
849
850
851 // Returns a class loaded by the bootstrap class loader; or null
852 // if not found. ClassNotFoundException is not thrown.
853 // FindClassFromBootLoader is exported to the launcher for windows.
854 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
855 const char* name))
856 // Java libraries should ensure that name is never null or illegal.
857 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
858 // It's impossible to create this class; the name cannot fit
859 // into the constant pool.
860 return nullptr;
861 }
862 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
863
864 TempNewSymbol h_name = SymbolTable::new_symbol(name);
865 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
866 if (k == nullptr) {
867 return nullptr;
868 }
869
870 if (log_is_enabled(Debug, class, resolve)) {
871 trace_class_resolution(k);
872 }
873 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
874 JVM_END
875
876 // Find a class with this name in this loader, using the caller's protection domain.
877 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
878 jboolean init, jobject loader,
879 jclass caller))
880 TempNewSymbol h_name =
881 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
882 CHECK_NULL);
883
884 oop loader_oop = JNIHandles::resolve(loader);
885 oop from_class = JNIHandles::resolve(caller);
886 oop protection_domain = nullptr;
887 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
888 // NPE. Put it in another way, the bootstrap class loader has all permission and
889 // thus no checkPackageAccess equivalence in the VM class loader.
890 // The caller is also passed as null by the java code if there is no security
891 // manager to avoid the performance cost of getting the calling class.
892 if (from_class != nullptr && loader_oop != nullptr) {
893 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
894 }
895
896 Handle h_loader(THREAD, loader_oop);
897 Handle h_prot(THREAD, protection_domain);
898 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
899 h_prot, false, THREAD);
900
901 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
902 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
903 }
904 return result;
905 JVM_END
906
907 // Currently only called from the old verifier.
908 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
909 jboolean init, jclass from))
910 TempNewSymbol h_name =
911 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
912 CHECK_NULL);
913 oop from_class_oop = JNIHandles::resolve(from);
914 Klass* from_class = (from_class_oop == nullptr)
915 ? (Klass*)nullptr
916 : java_lang_Class::as_Klass(from_class_oop);
917 oop class_loader = nullptr;
918 oop protection_domain = nullptr;
919 if (from_class != nullptr) {
920 class_loader = from_class->class_loader();
921 protection_domain = from_class->protection_domain();
922 }
923 Handle h_loader(THREAD, class_loader);
924 Handle h_prot (THREAD, protection_domain);
925 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
926 h_prot, true, thread);
927
928 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
929 // this function is generally only used for class loading during verification.
930 ResourceMark rm;
931 oop from_mirror = JNIHandles::resolve_non_null(from);
932 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
933 const char * from_name = from_class->external_name();
934
935 oop mirror = JNIHandles::resolve_non_null(result);
936 Klass* to_class = java_lang_Class::as_Klass(mirror);
937 const char * to = to_class->external_name();
938 log_debug(class, resolve)("%s %s (verification)", from_name, to);
939 }
940
941 return result;
942 JVM_END
943
944 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
945 static jclass jvm_define_class_common(const char *name,
946 jobject loader, const jbyte *buf,
947 jsize len, jobject pd, const char *source,
948 TRAPS) {
949 if (source == nullptr) source = "__JVM_DefineClass__";
950
951 JavaThread* jt = THREAD;
952
953 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
954 ClassLoader::perf_define_appclass_selftime(),
955 ClassLoader::perf_define_appclasses(),
956 jt->get_thread_stat()->perf_recursion_counts_addr(),
957 jt->get_thread_stat()->perf_timers_addr(),
958 PerfClassTraceTime::DEFINE_CLASS);
959
960 if (UsePerfData) {
961 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
962 }
963
964 // Class resolution will get the class name from the .class stream if the name is null.
965 TempNewSymbol class_name = name == nullptr ? nullptr :
966 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
967 CHECK_NULL);
968
969 ResourceMark rm(THREAD);
970 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
971 Handle class_loader (THREAD, JNIHandles::resolve(loader));
972 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
973 ClassLoadInfo cl_info(protection_domain);
974 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
975 class_loader,
976 cl_info,
977 CHECK_NULL);
978
979 if (log_is_enabled(Debug, class, resolve)) {
980 trace_class_resolution(k);
981 }
982
983 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
984 }
985
986 enum {
987 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
988 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
989 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
990 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
991 };
992
993 /*
994 * Define a class with the specified flags that indicates if it's a nestmate,
995 * hidden, or strongly referenced from class loader.
996 */
997 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
998 const jbyte *buf, jsize len, jobject pd,
999 jboolean init, int flags, jobject classData, TRAPS) {
1000 ResourceMark rm(THREAD);
1001
1002 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
1003 // Lookup class must be a non-null instance
1004 if (lookup_k == nullptr) {
1005 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1006 }
1007 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
1008
1009 Handle class_loader (THREAD, lookup_k->class_loader());
1010
1011 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1012 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1013 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1014 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1015
1016 InstanceKlass* host_class = nullptr;
1017 if (is_nestmate) {
1018 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1019 }
1020
1021 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1022 name,
1023 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1024 is_nestmate ? host_class->external_name() : "",
1025 is_hidden ? "hidden" : "not hidden",
1026 is_strong ? "strong" : "weak",
1027 vm_annotations ? "with vm annotations" : "without vm annotation");
1028
1029 if (!is_hidden) {
1030 // classData is only applicable for hidden classes
1031 if (classData != nullptr) {
1032 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1033 }
1034 if (is_nestmate) {
1035 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1036 }
1037 if (!is_strong) {
1038 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1039 }
1040 if (vm_annotations) {
1041 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1042 }
1043 if (flags != STRONG_LOADER_LINK) {
1044 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1045 err_msg("invalid flag 0x%x", flags));
1046 }
1047 }
1048
1049 // Class resolution will get the class name from the .class stream if the name is null.
1050 TempNewSymbol class_name = name == nullptr ? nullptr :
1051 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1052 CHECK_NULL);
1053
1054 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1055 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1056 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1057
1058 InstanceKlass* ik = nullptr;
1059 if (!is_hidden) {
1060 ClassLoadInfo cl_info(protection_domain);
1061 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1062 class_loader,
1063 cl_info,
1064 CHECK_NULL);
1065
1066 if (log_is_enabled(Debug, class, resolve)) {
1067 trace_class_resolution(ik);
1068 }
1069 } else { // hidden
1070 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1071 ClassLoadInfo cl_info(protection_domain,
1072 host_class,
1073 classData_h,
1074 is_hidden,
1075 is_strong,
1076 vm_annotations);
1077 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1078 class_loader,
1079 cl_info,
1080 CHECK_NULL);
1081
1082 // The hidden class loader data has been artificially been kept alive to
1083 // this point. The mirror and any instances of this class have to keep
1084 // it alive afterwards.
1085 ik->class_loader_data()->dec_keep_alive_ref_count();
1086
1087 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1088 ModuleEntry* module = ik->module();
1089 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1090 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1091 module_name,
1092 ik->external_name(),
1093 host_class->external_name(),
1094 ik->is_hidden() ? "is hidden" : "is not hidden");
1095 }
1096 }
1097
1098 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1099 // non-hidden class or nestmate class must be in the same package as the Lookup class
1100 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1101 }
1102
1103 if (init) {
1104 ik->initialize(CHECK_NULL);
1105 } else {
1106 ik->link_class(CHECK_NULL);
1107 }
1108
1109 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1110 }
1111
1112 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1113 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1114 JVM_END
1115
1116 /*
1117 * Define a class with the specified lookup class.
1118 * lookup: Lookup class
1119 * name: the name of the class
1120 * buf: class bytes
1121 * len: length of class bytes
1122 * pd: protection domain
1123 * init: initialize the class
1124 * flags: properties of the class
1125 * classData: private static pre-initialized field
1126 */
1127 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1128 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1129
1130 if (lookup == nullptr) {
1131 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1132 }
1133
1134 assert(buf != nullptr, "buf must not be null");
1135
1136 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1137 JVM_END
1138
1139 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1140
1141 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1142 JVM_END
1143
1144 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1145 ResourceMark rm(THREAD);
1146
1147 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1148 char* str = java_lang_String::as_utf8_string(h_name());
1149
1150 // Sanity check, don't expect null
1151 if (str == nullptr) return nullptr;
1152
1153 // Internalize the string, converting '.' to '/' in string.
1154 char* p = (char*)str;
1155 while (*p != '\0') {
1156 if (*p == '.') {
1157 *p = '/';
1158 }
1159 p++;
1160 }
1161
1162 const int str_len = (int)(p - str);
1163 if (str_len > Symbol::max_length()) {
1164 // It's impossible to create this class; the name cannot fit
1165 // into the constant pool.
1166 return nullptr;
1167 }
1168 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1169
1170 // Security Note:
1171 // The Java level wrapper will perform the necessary security check allowing
1172 // us to pass the null as the initiating class loader.
1173 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1174 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1175 h_loader,
1176 Handle());
1177 #if INCLUDE_CDS
1178 if (k == nullptr) {
1179 // If the class is not already loaded, try to see if it's in the shared
1180 // archive for the current classloader (h_loader).
1181 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1182 }
1183 #endif
1184 return (k == nullptr) ? nullptr :
1185 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1186 JVM_END
1187
1188 // Module support //////////////////////////////////////////////////////////////////////////////
1189
1190 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1191 jstring location, jobjectArray packages))
1192 Handle h_module (THREAD, JNIHandles::resolve(module));
1193 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1194 JVM_END
1195
1196 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1197 Handle h_module (THREAD, JNIHandles::resolve(module));
1198 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1199 JVM_END
1200
1201 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1202 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1203 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1204 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1205 JVM_END
1206
1207 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1208 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1209 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1210 JVM_END
1211
1212 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1213 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1214 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1215 JVM_END
1216
1217 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1218 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1219 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1220 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1221 JVM_END
1222
1223 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1224 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1225 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1226 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1227 JVM_END
1228
1229 // Reflection support //////////////////////////////////////////////////////////////////////////////
1230
1231 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1232 assert (cls != nullptr, "illegal class");
1233 JvmtiVMObjectAllocEventCollector oam;
1234 ResourceMark rm(THREAD);
1235 HandleMark hm(THREAD);
1236 Handle java_class(THREAD, JNIHandles::resolve(cls));
1237 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1238 return (jstring) JNIHandles::make_local(THREAD, result);
1239 JVM_END
1240
1241
1242 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1243 JvmtiVMObjectAllocEventCollector oam;
1244 oop mirror = JNIHandles::resolve_non_null(cls);
1245
1246 // Special handling for primitive objects
1247 if (java_lang_Class::is_primitive(mirror)) {
1248 // Primitive objects does not have any interfaces
1249 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1250 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1251 }
1252
1253 Klass* klass = java_lang_Class::as_Klass(mirror);
1254 // Figure size of result array
1255 int size;
1256 if (klass->is_instance_klass()) {
1257 InstanceKlass* ik = InstanceKlass::cast(klass);
1258 size = ik->local_interfaces()->length();
1259 } else {
1260 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1261 size = 2;
1262 }
1263
1264 // Allocate result array
1265 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1266 objArrayHandle result (THREAD, r);
1267 // Fill in result
1268 if (klass->is_instance_klass()) {
1269 // Regular instance klass, fill in all local interfaces
1270 for (int index = 0; index < size; index++) {
1271 InstanceKlass* ik = InstanceKlass::cast(klass);
1272 Klass* k = ik->local_interfaces()->at(index);
1273 result->obj_at_put(index, k->java_mirror());
1274 }
1275 } else {
1276 // All arrays implement java.lang.Cloneable and java.io.Serializable
1277 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1278 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1279 }
1280 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1281 JVM_END
1282
1283
1284 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1285 oop mirror = JNIHandles::resolve_non_null(cls);
1286 if (java_lang_Class::is_primitive(mirror)) {
1287 return JNI_FALSE;
1288 }
1289 Klass* k = java_lang_Class::as_Klass(mirror);
1290 jboolean result = k->is_interface();
1291 assert(!result || k->is_instance_klass(),
1292 "all interfaces are instance types");
1293 // The compiler intrinsic for isInterface tests the
1294 // Klass::_access_flags bits in the same way.
1295 return result;
1296 JVM_END
1297
1298 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1299 oop mirror = JNIHandles::resolve_non_null(cls);
1300 if (java_lang_Class::is_primitive(mirror)) {
1301 return JNI_FALSE;
1302 }
1303 Klass* k = java_lang_Class::as_Klass(mirror);
1304 return k->is_hidden();
1305 JVM_END
1306
1307 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls))
1308 oop mirror = JNIHandles::resolve_non_null(cls);
1309 if (java_lang_Class::is_primitive(mirror)) {
1310 return JNI_FALSE;
1311 }
1312 Klass* k = java_lang_Class::as_Klass(mirror);
1313 if (EnableValhalla) {
1314 return k->is_array_klass() || k->is_identity_class();
1315 } else {
1316 return k->is_interface() ? JNI_FALSE : JNI_TRUE;
1317 }
1318 JVM_END
1319
1320 JVM_ENTRY(jboolean, JVM_IsImplicitlyConstructibleClass(JNIEnv *env, jclass cls))
1321 oop mirror = JNIHandles::resolve_non_null(cls);
1322 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1323 return ik->is_implicitly_constructible();
1324 JVM_END
1325
1326
1327 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1328 oop mirror = JNIHandles::resolve_non_null(cls);
1329 if (mirror == nullptr) {
1330 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1331 }
1332
1333 if (java_lang_Class::is_primitive(mirror)) {
1334 // Primitive types does not have a protection domain.
1335 return nullptr;
1336 }
1337
1338 oop pd = java_lang_Class::protection_domain(mirror);
1339 return (jobject) JNIHandles::make_local(THREAD, pd);
1340 JVM_END
1341
1342
1343 // Returns the inherited_access_control_context field of the running thread.
1344 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1345 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1346 return JNIHandles::make_local(THREAD, result);
1347 JVM_END
1348
1349 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1350 if (!UsePrivilegedStack) return nullptr;
1351
1352 ResourceMark rm(THREAD);
1353 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1354 JvmtiVMObjectAllocEventCollector oam;
1355
1356 // count the protection domains on the execution stack. We collapse
1357 // duplicate consecutive protection domains into a single one, as
1358 // well as stopping when we hit a privileged frame.
1359
1360 oop previous_protection_domain = nullptr;
1361 Handle privileged_context(thread, nullptr);
1362 bool is_privileged = false;
1363 oop protection_domain = nullptr;
1364
1365 // Iterate through Java frames
1366 vframeStream vfst(thread);
1367 for(; !vfst.at_end(); vfst.next()) {
1368 // get method of frame
1369 Method* method = vfst.method();
1370
1371 // stop at the first privileged frame
1372 if (method->method_holder() == vmClasses::AccessController_klass() &&
1373 method->name() == vmSymbols::executePrivileged_name())
1374 {
1375 // this frame is privileged
1376 is_privileged = true;
1377
1378 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1379
1380 StackValueCollection* locals = priv->locals();
1381 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1382 StackValue* clr_sv = locals->at(2); // Class<?> caller
1383 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1384 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1385 privileged_context = ctx_sv->get_obj();
1386 Handle caller = clr_sv->get_obj();
1387
1388 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1389 protection_domain = caller_klass->protection_domain();
1390 } else {
1391 protection_domain = method->method_holder()->protection_domain();
1392 }
1393
1394 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1395 local_array->push(Handle(thread, protection_domain));
1396 previous_protection_domain = protection_domain;
1397 }
1398
1399 if (is_privileged) break;
1400 }
1401
1402
1403 // either all the domains on the stack were system domains, or
1404 // we had a privileged system domain
1405 if (local_array->is_empty()) {
1406 if (is_privileged && privileged_context.is_null()) return nullptr;
1407
1408 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1409 return JNIHandles::make_local(THREAD, result);
1410 }
1411
1412 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1413 local_array->length(), CHECK_NULL);
1414 objArrayHandle h_context(thread, context);
1415 for (int index = 0; index < local_array->length(); index++) {
1416 h_context->obj_at_put(index, local_array->at(index)());
1417 }
1418
1419 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1420
1421 return JNIHandles::make_local(THREAD, result);
1422 JVM_END
1423
1424 class ScopedValueBindingsResolver {
1425 public:
1426 InstanceKlass* Carrier_klass;
1427 ScopedValueBindingsResolver(JavaThread* THREAD) {
1428 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1429 Carrier_klass = InstanceKlass::cast(k);
1430 }
1431 };
1432
1433 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1434 ResourceMark rm(THREAD);
1435 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1436 JvmtiVMObjectAllocEventCollector oam;
1437
1438 static ScopedValueBindingsResolver resolver(THREAD);
1439
1440 // Iterate through Java frames
1441 vframeStream vfst(thread);
1442 for(; !vfst.at_end(); vfst.next()) {
1443 int loc = -1;
1444 // get method of frame
1445 Method* method = vfst.method();
1446
1447 Symbol *name = method->name();
1448
1449 InstanceKlass* holder = method->method_holder();
1450 if (name == vmSymbols::runWith_method_name()) {
1451 if (holder == vmClasses::Thread_klass()
1452 || holder == resolver.Carrier_klass) {
1453 loc = 1;
1454 }
1455 }
1456
1457 if (loc != -1) {
1458 javaVFrame *frame = vfst.asJavaVFrame();
1459 StackValueCollection* locals = frame->locals();
1460 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1461 Handle result = head_sv->get_obj();
1462 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1463 if (result() != nullptr) {
1464 return JNIHandles::make_local(THREAD, result());
1465 }
1466 }
1467 }
1468
1469 return nullptr;
1470 JVM_END
1471
1472 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1474 return (k != nullptr) && k->is_array_klass() ? true : false;
1475 JVM_END
1476
1477
1478 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1479 oop mirror = JNIHandles::resolve_non_null(cls);
1480 return (jboolean) java_lang_Class::is_primitive(mirror);
1481 JVM_END
1482
1483
1484 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1485 oop mirror = JNIHandles::resolve_non_null(cls);
1486 if (java_lang_Class::is_primitive(mirror)) {
1487 // Primitive type
1488 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1489 }
1490
1491 Klass* k = java_lang_Class::as_Klass(mirror);
1492 debug_only(int computed_modifiers = k->compute_modifier_flags());
1493 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1494 return k->modifier_flags();
1495 JVM_END
1496
1497
1498 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1499
1500 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1501 JvmtiVMObjectAllocEventCollector oam;
1502 // ofClass is a reference to a java_lang_Class object. The mirror object
1503 // of an InstanceKlass
1504 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1505 if (java_lang_Class::is_primitive(ofMirror) ||
1506 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1507 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1508 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1509 }
1510
1511 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1512 InnerClassesIterator iter(k);
1513
1514 if (iter.length() == 0) {
1515 // Neither an inner nor outer class
1516 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1517 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1518 }
1519
1520 // find inner class info
1521 constantPoolHandle cp(thread, k->constants());
1522 int length = iter.length();
1523
1524 // Allocate temp. result array
1525 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1526 objArrayHandle result (THREAD, r);
1527 int members = 0;
1528
1529 for (; !iter.done(); iter.next()) {
1530 int ioff = iter.inner_class_info_index();
1531 int ooff = iter.outer_class_info_index();
1532
1533 if (ioff != 0 && ooff != 0) {
1534 // Check to see if the name matches the class we're looking for
1535 // before attempting to find the class.
1536 if (cp->klass_name_at_matches(k, ooff)) {
1537 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1538 if (outer_klass == k) {
1539 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1540 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1541
1542 // Throws an exception if outer klass has not declared k as
1543 // an inner klass
1544 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1545
1546 result->obj_at_put(members, inner_klass->java_mirror());
1547 members++;
1548 }
1549 }
1550 }
1551 }
1552
1553 if (members != length) {
1554 // Return array of right length
1555 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1556 for(int i = 0; i < members; i++) {
1557 res->obj_at_put(i, result->obj_at(i));
1558 }
1559 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1560 }
1561
1562 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1563 JVM_END
1564
1565
1566 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1567 {
1568 // ofClass is a reference to a java_lang_Class object.
1569 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1570 if (java_lang_Class::is_primitive(ofMirror)) {
1571 return nullptr;
1572 }
1573 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1574 if (!klass->is_instance_klass()) {
1575 return nullptr;
1576 }
1577
1578 bool inner_is_member = false;
1579 Klass* outer_klass
1580 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1581 if (outer_klass == nullptr) return nullptr; // already a top-level class
1582 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1583 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1584 }
1585 JVM_END
1586
1587 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1588 {
1589 oop mirror = JNIHandles::resolve_non_null(cls);
1590 if (java_lang_Class::is_primitive(mirror)) {
1591 return nullptr;
1592 }
1593 Klass* klass = java_lang_Class::as_Klass(mirror);
1594 if (!klass->is_instance_klass()) {
1595 return nullptr;
1596 }
1597 InstanceKlass* k = InstanceKlass::cast(klass);
1598 int ooff = 0, noff = 0;
1599 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1600 if (noff != 0) {
1601 constantPoolHandle i_cp(thread, k->constants());
1602 Symbol* name = i_cp->symbol_at(noff);
1603 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1604 return (jstring) JNIHandles::make_local(THREAD, str());
1605 }
1606 }
1607 return nullptr;
1608 }
1609 JVM_END
1610
1611 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1612 assert (cls != nullptr, "illegal class");
1613 JvmtiVMObjectAllocEventCollector oam;
1614 ResourceMark rm(THREAD);
1615 oop mirror = JNIHandles::resolve_non_null(cls);
1616 // Return null for arrays and primitives
1617 if (!java_lang_Class::is_primitive(mirror)) {
1618 Klass* k = java_lang_Class::as_Klass(mirror);
1619 if (k->is_instance_klass()) {
1620 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1621 if (sym == nullptr) return nullptr;
1622 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1623 return (jstring) JNIHandles::make_local(THREAD, str());
1624 }
1625 }
1626 return nullptr;
1627 JVM_END
1628
1629
1630 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1631 assert (cls != nullptr, "illegal class");
1632 oop mirror = JNIHandles::resolve_non_null(cls);
1633 // Return null for arrays and primitives
1634 if (!java_lang_Class::is_primitive(mirror)) {
1635 Klass* k = java_lang_Class::as_Klass(mirror);
1636 if (k->is_instance_klass()) {
1637 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1638 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1639 }
1640 }
1641 return nullptr;
1642 JVM_END
1643
1644
1645 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1646 // some of this code was adapted from from jni_FromReflectedField
1647
1648 oop reflected = JNIHandles::resolve_non_null(field);
1649 oop mirror = java_lang_reflect_Field::clazz(reflected);
1650 Klass* k = java_lang_Class::as_Klass(mirror);
1651 int slot = java_lang_reflect_Field::slot(reflected);
1652 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1653
1654 InstanceKlass* ik = InstanceKlass::cast(k);
1655 int offset = ik->field_offset(slot);
1656
1657 if (modifiers & JVM_ACC_STATIC) {
1658 // for static fields we only look in the current class
1659 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1660 assert(false, "cannot find static field");
1661 return false;
1662 }
1663 } else {
1664 // for instance fields we start with the current class and work
1665 // our way up through the superclass chain
1666 if (!ik->find_field_from_offset(offset, false, &fd)) {
1667 assert(false, "cannot find instance field");
1668 return false;
1669 }
1670 }
1671 return true;
1672 }
1673
1674 static Method* jvm_get_method_common(jobject method) {
1675 // some of this code was adapted from from jni_FromReflectedMethod
1676
1677 oop reflected = JNIHandles::resolve_non_null(method);
1678 oop mirror = nullptr;
1679 int slot = 0;
1680
1681 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1682 mirror = java_lang_reflect_Constructor::clazz(reflected);
1683 slot = java_lang_reflect_Constructor::slot(reflected);
1684 } else {
1685 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1686 "wrong type");
1687 mirror = java_lang_reflect_Method::clazz(reflected);
1688 slot = java_lang_reflect_Method::slot(reflected);
1689 }
1690 Klass* k = java_lang_Class::as_Klass(mirror);
1691
1692 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1693 assert(m != nullptr, "cannot find method");
1694 return m; // caller has to deal with null in product mode
1695 }
1696
1697 /* Type use annotations support (JDK 1.8) */
1698
1699 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1700 assert (cls != nullptr, "illegal class");
1701 ResourceMark rm(THREAD);
1702 // Return null for arrays and primitives
1703 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1704 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1705 if (k->is_instance_klass()) {
1706 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1707 if (type_annotations != nullptr) {
1708 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1709 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1710 }
1711 }
1712 }
1713 return nullptr;
1714 JVM_END
1715
1716 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1717 assert (method != nullptr, "illegal method");
1718 // method is a handle to a java.lang.reflect.Method object
1719 Method* m = jvm_get_method_common(method);
1720 if (m == nullptr) {
1721 return nullptr;
1722 }
1723
1724 AnnotationArray* type_annotations = m->type_annotations();
1725 if (type_annotations != nullptr) {
1726 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1727 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1728 }
1729
1730 return nullptr;
1731 JVM_END
1732
1733 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1734 assert (field != nullptr, "illegal field");
1735 fieldDescriptor fd;
1736 bool gotFd = jvm_get_field_common(field, fd);
1737 if (!gotFd) {
1738 return nullptr;
1739 }
1740
1741 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1742 JVM_END
1743
1744 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1745 if (!cp->is_within_bounds(index)) {
1746 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1747 }
1748 }
1749
1750 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1751 {
1752 // method is a handle to a java.lang.reflect.Method object
1753 Method* method_ptr = jvm_get_method_common(method);
1754 methodHandle mh (THREAD, method_ptr);
1755 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1756 const int num_params = mh->method_parameters_length();
1757
1758 if (num_params < 0) {
1759 // A -1 return value from method_parameters_length means there is no
1760 // parameter data. Return null to indicate this to the reflection
1761 // API.
1762 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1763 return (jobjectArray)nullptr;
1764 } else {
1765 // Otherwise, we return something up to reflection, even if it is
1766 // a zero-length array. Why? Because in some cases this can
1767 // trigger a MalformedParametersException.
1768
1769 // make sure all the symbols are properly formatted
1770 for (int i = 0; i < num_params; i++) {
1771 MethodParametersElement* params = mh->method_parameters_start();
1772 int index = params[i].name_cp_index;
1773 constantPoolHandle cp(THREAD, mh->constants());
1774 bounds_check(cp, index, CHECK_NULL);
1775
1776 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1777 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1778 "Wrong type at constant pool index");
1779 }
1780
1781 }
1782
1783 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1784 objArrayHandle result (THREAD, result_oop);
1785
1786 for (int i = 0; i < num_params; i++) {
1787 MethodParametersElement* params = mh->method_parameters_start();
1788 // For a 0 index, give a null symbol
1789 Symbol* sym = 0 != params[i].name_cp_index ?
1790 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1791 int flags = params[i].flags;
1792 oop param = Reflection::new_parameter(reflected_method, i, sym,
1793 flags, CHECK_NULL);
1794 result->obj_at_put(i, param);
1795 }
1796 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1797 }
1798 }
1799 JVM_END
1800
1801 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1802
1803 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1804 {
1805 JvmtiVMObjectAllocEventCollector oam;
1806
1807 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1808 // Exclude primitive types and array types
1809 if (java_lang_Class::is_primitive(ofMirror) ||
1810 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1811 // Return empty array
1812 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1813 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1814 }
1815
1816 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1817 constantPoolHandle cp(THREAD, k->constants());
1818
1819 // Ensure class is linked
1820 k->link_class(CHECK_NULL);
1821
1822 // Allocate result
1823 int num_fields;
1824
1825 if (publicOnly) {
1826 num_fields = 0;
1827 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1828 if (fs.access_flags().is_public()) ++num_fields;
1829 }
1830 } else {
1831 num_fields = k->java_fields_count();
1832 }
1833
1834 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1835 objArrayHandle result (THREAD, r);
1836
1837 int out_idx = 0;
1838 fieldDescriptor fd;
1839 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1840 if (!publicOnly || fs.access_flags().is_public()) {
1841 fd.reinitialize(k, fs.index());
1842 oop field = Reflection::new_field(&fd, CHECK_NULL);
1843 result->obj_at_put(out_idx, field);
1844 ++out_idx;
1845 }
1846 }
1847 assert(out_idx == num_fields, "just checking");
1848 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1849 }
1850 JVM_END
1851
1852 // A class is a record if and only if it is final and a direct subclass of
1853 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1854 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1855 {
1856 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1857 if (k != nullptr && k->is_instance_klass()) {
1858 InstanceKlass* ik = InstanceKlass::cast(k);
1859 return ik->is_record();
1860 } else {
1861 return false;
1862 }
1863 }
1864 JVM_END
1865
1866 // Returns an array containing the components of the Record attribute,
1867 // or null if the attribute is not present.
1868 //
1869 // Note that this function returns the components of the Record attribute
1870 // even if the class is not a record.
1871 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1872 {
1873 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1874 assert(c->is_instance_klass(), "must be");
1875 InstanceKlass* ik = InstanceKlass::cast(c);
1876
1877 Array<RecordComponent*>* components = ik->record_components();
1878 if (components != nullptr) {
1879 JvmtiVMObjectAllocEventCollector oam;
1880 constantPoolHandle cp(THREAD, ik->constants());
1881 int length = components->length();
1882 assert(length >= 0, "unexpected record_components length");
1883 objArrayOop record_components =
1884 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1885 objArrayHandle components_h (THREAD, record_components);
1886
1887 for (int x = 0; x < length; x++) {
1888 RecordComponent* component = components->at(x);
1889 assert(component != nullptr, "unexpected null record component");
1890 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1891 components_h->obj_at_put(x, component_oop);
1892 }
1893 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1894 }
1895
1896 return nullptr;
1897 }
1898 JVM_END
1899
1900 static bool select_method(const methodHandle& method, bool want_constructor) {
1901 bool is_ctor = (method->is_object_constructor());
1902 if (want_constructor) {
1903 return is_ctor;
1904 } else {
1905 return (!is_ctor &&
1906 !method->is_class_initializer() &&
1907 !method->is_overpass());
1908 }
1909 }
1910
1911 static jobjectArray get_class_declared_methods_helper(
1912 JNIEnv *env,
1913 jclass ofClass, jboolean publicOnly,
1914 bool want_constructor,
1915 Klass* klass, TRAPS) {
1916
1917 JvmtiVMObjectAllocEventCollector oam;
1918
1919 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1920 // Exclude primitive types and array types
1921 if (java_lang_Class::is_primitive(ofMirror)
1922 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1923 // Return empty array
1924 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1925 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1926 }
1927
1928 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1929
1930 // Ensure class is linked
1931 k->link_class(CHECK_NULL);
1932
1933 Array<Method*>* methods = k->methods();
1934 int methods_length = methods->length();
1935
1936 // Save original method_idnum in case of redefinition, which can change
1937 // the idnum of obsolete methods. The new method will have the same idnum
1938 // but if we refresh the methods array, the counts will be wrong.
1939 ResourceMark rm(THREAD);
1940 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1941 int num_methods = 0;
1942
1943 for (int i = 0; i < methods_length; i++) {
1944 methodHandle method(THREAD, methods->at(i));
1945 if (select_method(method, want_constructor)) {
1946 if (!publicOnly || method->is_public()) {
1947 idnums->push(method->method_idnum());
1948 ++num_methods;
1949 }
1950 }
1951 }
1952
1953 // Allocate result
1954 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1955 objArrayHandle result (THREAD, r);
1956
1957 // Now just put the methods that we selected above, but go by their idnum
1958 // in case of redefinition. The methods can be redefined at any safepoint,
1959 // so above when allocating the oop array and below when creating reflect
1960 // objects.
1961 for (int i = 0; i < num_methods; i++) {
1962 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1963 if (method.is_null()) {
1964 // Method may have been deleted and seems this API can handle null
1965 // Otherwise should probably put a method that throws NSME
1966 result->obj_at_put(i, nullptr);
1967 } else {
1968 oop m;
1969 if (want_constructor) {
1970 assert(method->is_object_constructor(), "must be");
1971 m = Reflection::new_constructor(method, CHECK_NULL);
1972 } else {
1973 m = Reflection::new_method(method, false, CHECK_NULL);
1974 }
1975 result->obj_at_put(i, m);
1976 }
1977 }
1978
1979 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1980 }
1981
1982 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1983 {
1984 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1985 /*want_constructor*/ false,
1986 vmClasses::reflect_Method_klass(), THREAD);
1987 }
1988 JVM_END
1989
1990 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1991 {
1992 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1993 /*want_constructor*/ true,
1994 vmClasses::reflect_Constructor_klass(), THREAD);
1995 }
1996 JVM_END
1997
1998 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1999 {
2000 oop mirror = JNIHandles::resolve_non_null(cls);
2001 if (java_lang_Class::is_primitive(mirror)) {
2002 // Primitive type
2003 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2004 }
2005
2006 Klass* k = java_lang_Class::as_Klass(mirror);
2007 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2008 }
2009 JVM_END
2010
2011 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2012 {
2013 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2014 assert(c->is_instance_klass(), "must be");
2015 InstanceKlass* ck = InstanceKlass::cast(c);
2016 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2017 assert(m->is_instance_klass(), "must be");
2018 InstanceKlass* mk = InstanceKlass::cast(m);
2019 return ck->has_nestmate_access_to(mk, THREAD);
2020 }
2021 JVM_END
2022
2023 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2024 {
2025 // current is not a primitive or array class
2026 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2027 assert(c->is_instance_klass(), "must be");
2028 InstanceKlass* ck = InstanceKlass::cast(c);
2029 InstanceKlass* host = ck->nest_host(THREAD);
2030 return (jclass) (host == nullptr ? nullptr :
2031 JNIHandles::make_local(THREAD, host->java_mirror()));
2032 }
2033 JVM_END
2034
2035 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2036 {
2037 // current is not a primitive or array class
2038 ResourceMark rm(THREAD);
2039 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2040 assert(c->is_instance_klass(), "must be");
2041 InstanceKlass* ck = InstanceKlass::cast(c);
2042 InstanceKlass* host = ck->nest_host(THREAD);
2043
2044 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2045 ck->external_name(), host->external_name());
2046 {
2047 JvmtiVMObjectAllocEventCollector oam;
2048 Array<u2>* members = host->nest_members();
2049 int length = members == nullptr ? 0 : members->length();
2050
2051 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2052
2053 // nest host is first in the array so make it one bigger
2054 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2055 length + 1, CHECK_NULL);
2056 objArrayHandle result(THREAD, r);
2057 result->obj_at_put(0, host->java_mirror());
2058 if (length != 0) {
2059 int count = 0;
2060 for (int i = 0; i < length; i++) {
2061 int cp_index = members->at(i);
2062 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2063 if (HAS_PENDING_EXCEPTION) {
2064 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2065 return nullptr; // propagate VMEs
2066 }
2067 if (log_is_enabled(Trace, class, nestmates)) {
2068 stringStream ss;
2069 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2070 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2071 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2072 log_trace(class, nestmates)("%s", ss.as_string());
2073 }
2074 CLEAR_PENDING_EXCEPTION;
2075 continue;
2076 }
2077 if (k->is_instance_klass()) {
2078 InstanceKlass* ik = InstanceKlass::cast(k);
2079 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2080 if (nest_host_k == host) {
2081 result->obj_at_put(count+1, k->java_mirror());
2082 count++;
2083 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2084 } else {
2085 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2086 ik->external_name(), nest_host_k->external_name());
2087 }
2088 } else {
2089 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2090 k->external_name());
2091 }
2092 }
2093 if (count < length) {
2094 // we had invalid entries so we need to compact the array
2095 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2096 length + 1, count + 1);
2097
2098 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2099 count + 1, CHECK_NULL);
2100 objArrayHandle result2(THREAD, r2);
2101 for (int i = 0; i < count + 1; i++) {
2102 result2->obj_at_put(i, result->obj_at(i));
2103 }
2104 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2105 }
2106 }
2107 else {
2108 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2109 }
2110 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2111 }
2112 }
2113 JVM_END
2114
2115 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2116 {
2117 oop mirror = JNIHandles::resolve_non_null(current);
2118 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2119 Klass* c = java_lang_Class::as_Klass(mirror);
2120 assert(c->is_instance_klass(), "must be");
2121 InstanceKlass* ik = InstanceKlass::cast(c);
2122 ResourceMark rm(THREAD);
2123 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2124 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2125 if (ik->is_sealed()) {
2126 JvmtiVMObjectAllocEventCollector oam;
2127 Array<u2>* subclasses = ik->permitted_subclasses();
2128 int length = subclasses->length();
2129
2130 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2131
2132 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2133 length, CHECK_NULL);
2134 objArrayHandle result(THREAD, r);
2135 int count = 0;
2136 for (int i = 0; i < length; i++) {
2137 int cp_index = subclasses->at(i);
2138 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2139 if (HAS_PENDING_EXCEPTION) {
2140 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2141 return nullptr; // propagate VMEs
2142 }
2143 if (log_is_enabled(Trace, class, sealed)) {
2144 stringStream ss;
2145 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2146 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2147 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2148 log_trace(class, sealed)("%s", ss.as_string());
2149 }
2150
2151 CLEAR_PENDING_EXCEPTION;
2152 continue;
2153 }
2154 if (k->is_instance_klass()) {
2155 result->obj_at_put(count++, k->java_mirror());
2156 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2157 }
2158 }
2159 if (count < length) {
2160 // we had invalid entries so we need to compact the array
2161 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2162 count, CHECK_NULL);
2163 objArrayHandle result2(THREAD, r2);
2164 for (int i = 0; i < count; i++) {
2165 result2->obj_at_put(i, result->obj_at(i));
2166 }
2167 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2168 }
2169 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2170 } else {
2171 return nullptr;
2172 }
2173 }
2174 JVM_END
2175
2176 // Constant pool access //////////////////////////////////////////////////////////
2177
2178 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2179 {
2180 JvmtiVMObjectAllocEventCollector oam;
2181 oop mirror = JNIHandles::resolve_non_null(cls);
2182 // Return null for primitives and arrays
2183 if (!java_lang_Class::is_primitive(mirror)) {
2184 Klass* k = java_lang_Class::as_Klass(mirror);
2185 if (k->is_instance_klass()) {
2186 InstanceKlass* k_h = InstanceKlass::cast(k);
2187 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2188 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2189 return JNIHandles::make_local(THREAD, jcp());
2190 }
2191 }
2192 return nullptr;
2193 }
2194 JVM_END
2195
2196
2197 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2198 {
2199 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2200 return cp->length();
2201 }
2202 JVM_END
2203
2204
2205 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2206 {
2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2208 bounds_check(cp, index, CHECK_NULL);
2209 constantTag tag = cp->tag_at(index);
2210 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2211 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2212 }
2213 Klass* k = cp->klass_at(index, CHECK_NULL);
2214 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2215 }
2216 JVM_END
2217
2218 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2219 {
2220 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2221 bounds_check(cp, index, CHECK_NULL);
2222 constantTag tag = cp->tag_at(index);
2223 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2224 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2225 }
2226 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2227 if (k == nullptr) return nullptr;
2228 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2229 }
2230 JVM_END
2231
2232 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2233 constantTag tag = cp->tag_at(index);
2234 if (!tag.is_method() && !tag.is_interface_method()) {
2235 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2236 }
2237 int klass_ref = cp->uncached_klass_ref_index_at(index);
2238 Klass* k_o;
2239 if (force_resolution) {
2240 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2241 } else {
2242 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2243 if (k_o == nullptr) return nullptr;
2244 }
2245 InstanceKlass* k = InstanceKlass::cast(k_o);
2246 Symbol* name = cp->uncached_name_ref_at(index);
2247 Symbol* sig = cp->uncached_signature_ref_at(index);
2248 methodHandle m (THREAD, k->find_method(name, sig));
2249 if (m.is_null()) {
2250 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2251 }
2252 oop method;
2253 if (m->is_object_constructor()) {
2254 method = Reflection::new_constructor(m, CHECK_NULL);
2255 } else {
2256 method = Reflection::new_method(m, true, CHECK_NULL);
2257 }
2258 return JNIHandles::make_local(THREAD, method);
2259 }
2260
2261 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2262 {
2263 JvmtiVMObjectAllocEventCollector oam;
2264 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2265 bounds_check(cp, index, CHECK_NULL);
2266 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2267 return res;
2268 }
2269 JVM_END
2270
2271 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2272 {
2273 JvmtiVMObjectAllocEventCollector oam;
2274 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2275 bounds_check(cp, index, CHECK_NULL);
2276 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2277 return res;
2278 }
2279 JVM_END
2280
2281 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2282 constantTag tag = cp->tag_at(index);
2283 if (!tag.is_field()) {
2284 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2285 }
2286 int klass_ref = cp->uncached_klass_ref_index_at(index);
2287 Klass* k_o;
2288 if (force_resolution) {
2289 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2290 } else {
2291 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2292 if (k_o == nullptr) return nullptr;
2293 }
2294 InstanceKlass* k = InstanceKlass::cast(k_o);
2295 Symbol* name = cp->uncached_name_ref_at(index);
2296 Symbol* sig = cp->uncached_signature_ref_at(index);
2297 fieldDescriptor fd;
2298 Klass* target_klass = k->find_field(name, sig, &fd);
2299 if (target_klass == nullptr) {
2300 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2301 }
2302 oop field = Reflection::new_field(&fd, CHECK_NULL);
2303 return JNIHandles::make_local(THREAD, field);
2304 }
2305
2306 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2307 {
2308 JvmtiVMObjectAllocEventCollector oam;
2309 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2310 bounds_check(cp, index, CHECK_NULL);
2311 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2312 return res;
2313 }
2314 JVM_END
2315
2316 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2317 {
2318 JvmtiVMObjectAllocEventCollector oam;
2319 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2320 bounds_check(cp, index, CHECK_NULL);
2321 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2322 return res;
2323 }
2324 JVM_END
2325
2326 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2327 {
2328 JvmtiVMObjectAllocEventCollector oam;
2329 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2330 bounds_check(cp, index, CHECK_NULL);
2331 constantTag tag = cp->tag_at(index);
2332 if (!tag.is_field_or_method()) {
2333 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2334 }
2335 int klass_ref = cp->uncached_klass_ref_index_at(index);
2336 Symbol* klass_name = cp->klass_name_at(klass_ref);
2337 Symbol* member_name = cp->uncached_name_ref_at(index);
2338 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2339 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2340 objArrayHandle dest(THREAD, dest_o);
2341 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2342 dest->obj_at_put(0, str());
2343 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2344 dest->obj_at_put(1, str());
2345 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2346 dest->obj_at_put(2, str());
2347 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2348 }
2349 JVM_END
2350
2351 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2352 {
2353 JvmtiVMObjectAllocEventCollector oam;
2354 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2355 bounds_check(cp, index, CHECK_0);
2356 constantTag tag = cp->tag_at(index);
2357 if (!tag.is_field_or_method()) {
2358 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2359 }
2360 return (jint) cp->uncached_klass_ref_index_at(index);
2361 }
2362 JVM_END
2363
2364 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2365 {
2366 JvmtiVMObjectAllocEventCollector oam;
2367 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2368 bounds_check(cp, index, CHECK_0);
2369 constantTag tag = cp->tag_at(index);
2370 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2371 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2372 }
2373 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2374 }
2375 JVM_END
2376
2377 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2378 {
2379 JvmtiVMObjectAllocEventCollector oam;
2380 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2381 bounds_check(cp, index, CHECK_NULL);
2382 constantTag tag = cp->tag_at(index);
2383 if (!tag.is_name_and_type()) {
2384 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2385 }
2386 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2387 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2388 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2389 objArrayHandle dest(THREAD, dest_o);
2390 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2391 dest->obj_at_put(0, str());
2392 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2393 dest->obj_at_put(1, str());
2394 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2395 }
2396 JVM_END
2397
2398 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2399 {
2400 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2401 bounds_check(cp, index, CHECK_0);
2402 constantTag tag = cp->tag_at(index);
2403 if (!tag.is_int()) {
2404 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2405 }
2406 return cp->int_at(index);
2407 }
2408 JVM_END
2409
2410 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2411 {
2412 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2413 bounds_check(cp, index, CHECK_(0L));
2414 constantTag tag = cp->tag_at(index);
2415 if (!tag.is_long()) {
2416 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2417 }
2418 return cp->long_at(index);
2419 }
2420 JVM_END
2421
2422 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2423 {
2424 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2425 bounds_check(cp, index, CHECK_(0.0f));
2426 constantTag tag = cp->tag_at(index);
2427 if (!tag.is_float()) {
2428 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2429 }
2430 return cp->float_at(index);
2431 }
2432 JVM_END
2433
2434 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2435 {
2436 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2437 bounds_check(cp, index, CHECK_(0.0));
2438 constantTag tag = cp->tag_at(index);
2439 if (!tag.is_double()) {
2440 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2441 }
2442 return cp->double_at(index);
2443 }
2444 JVM_END
2445
2446 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2447 {
2448 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2449 bounds_check(cp, index, CHECK_NULL);
2450 constantTag tag = cp->tag_at(index);
2451 if (!tag.is_string()) {
2452 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2453 }
2454 oop str = cp->string_at(index, CHECK_NULL);
2455 return (jstring) JNIHandles::make_local(THREAD, str);
2456 }
2457 JVM_END
2458
2459 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2460 {
2461 JvmtiVMObjectAllocEventCollector oam;
2462 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2463 bounds_check(cp, index, CHECK_NULL);
2464 constantTag tag = cp->tag_at(index);
2465 if (!tag.is_symbol()) {
2466 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2467 }
2468 Symbol* sym = cp->symbol_at(index);
2469 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2470 return (jstring) JNIHandles::make_local(THREAD, str());
2471 }
2472 JVM_END
2473
2474 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2475 {
2476 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2477 bounds_check(cp, index, CHECK_0);
2478 constantTag tag = cp->tag_at(index);
2479 jbyte result = tag.value();
2480 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2481 // they are changed to the corresponding tags from the JVM spec, so that java code in
2482 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2483 if (tag.is_klass_or_reference()) {
2484 result = JVM_CONSTANT_Class;
2485 } else if (tag.is_string_index()) {
2486 result = JVM_CONSTANT_String;
2487 } else if (tag.is_method_type_in_error()) {
2488 result = JVM_CONSTANT_MethodType;
2489 } else if (tag.is_method_handle_in_error()) {
2490 result = JVM_CONSTANT_MethodHandle;
2491 } else if (tag.is_dynamic_constant_in_error()) {
2492 result = JVM_CONSTANT_Dynamic;
2493 }
2494 return result;
2495 }
2496 JVM_END
2497
2498 // Assertion support. //////////////////////////////////////////////////////////
2499
2500 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2501 assert(cls != nullptr, "bad class");
2502
2503 oop r = JNIHandles::resolve(cls);
2504 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2505 if (java_lang_Class::is_primitive(r)) return false;
2506
2507 Klass* k = java_lang_Class::as_Klass(r);
2508 assert(k->is_instance_klass(), "must be an instance klass");
2509 if (!k->is_instance_klass()) return false;
2510
2511 ResourceMark rm(THREAD);
2512 const char* name = k->name()->as_C_string();
2513 bool system_class = k->class_loader() == nullptr;
2514 return JavaAssertions::enabled(name, system_class);
2515
2516 JVM_END
2517
2518
2519 // Return a new AssertionStatusDirectives object with the fields filled in with
2520 // command-line assertion arguments (i.e., -ea, -da).
2521 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2522 JvmtiVMObjectAllocEventCollector oam;
2523 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2524 return JNIHandles::make_local(THREAD, asd);
2525 JVM_END
2526
2527 // Arrays support /////////////////////////////////////////////////////////////
2528
2529 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2530 oop o = JNIHandles::resolve(array);
2531 Klass* k = o->klass();
2532 if ((o == nullptr) || (!k->is_array_klass())) {
2533 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2534 }
2535 return ArrayKlass::cast(k)->element_access_is_atomic();
2536 JVM_END
2537
2538 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2539 oop o = JNIHandles::resolve(array);
2540 Klass* k = o->klass();
2541 if ((o == nullptr) || (!k->is_array_klass())) {
2542 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2543 }
2544 if (k->is_flatArray_klass()) {
2545 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2546 if (!vk->element_access_is_atomic()) {
2547 /**
2548 * Need to decide how to implement:
2549 *
2550 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2551 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2552 * "checkcast" & "instanceof"
2553 *
2554 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2555 * possibly per instance lock structure. Said info, could be placed in
2556 * "trailer" rather than disturb the current arrayOop
2557 */
2558 Unimplemented();
2559 }
2560 }
2561 return array;
2562 JVM_END
2563
2564 // Verification ////////////////////////////////////////////////////////////////////////////////
2565
2566 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2567
2568 // RedefineClasses support: bug 6214132 caused verification to fail.
2569 // All functions from this section should call the jvmtiThreadSate function:
2570 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2571 // The function returns a Klass* of the _scratch_class if the verifier
2572 // was invoked in the middle of the class redefinition.
2573 // Otherwise it returns its argument value which is the _the_class Klass*.
2574 // Please, refer to the description in the jvmtiThreadSate.hpp.
2575
2576 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2579 return k->name()->as_utf8();
2580 JVM_END
2581
2582
2583 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2584 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2585 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2586 // types will have length zero if this is not an InstanceKlass
2587 // (length is determined by call to JVM_GetClassCPEntriesCount)
2588 if (k->is_instance_klass()) {
2589 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2590 for (int index = cp->length() - 1; index >= 0; index--) {
2591 constantTag tag = cp->tag_at(index);
2592 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2593 }
2594 }
2595 JVM_END
2596
2597
2598 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2599 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2600 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2601 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2602 JVM_END
2603
2604
2605 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2607 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2608 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2609 JVM_END
2610
2611
2612 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2613 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2614 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2615 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2616 JVM_END
2617
2618
2619 // The following methods, used for the verifier, are never called with
2620 // array klasses, so a direct cast to InstanceKlass is safe.
2621 // Typically, these methods are called in a loop with bounds determined
2622 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2623 // zero for arrays.
2624 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2625 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2626 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2627 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2628 int length = method->checked_exceptions_length();
2629 if (length > 0) {
2630 CheckedExceptionElement* table= method->checked_exceptions_start();
2631 for (int i = 0; i < length; i++) {
2632 exceptions[i] = table[i].class_cp_index;
2633 }
2634 }
2635 JVM_END
2636
2637
2638 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2639 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2640 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2641 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2642 return method->checked_exceptions_length();
2643 JVM_END
2644
2645
2646 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2647 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2648 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2649 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2650 memcpy(code, method->code_base(), method->code_size());
2651 JVM_END
2652
2653
2654 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2656 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2657 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2658 return method->code_size();
2659 JVM_END
2660
2661
2662 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2664 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2665 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2666 ExceptionTable extable(method);
2667 entry->start_pc = extable.start_pc(entry_index);
2668 entry->end_pc = extable.end_pc(entry_index);
2669 entry->handler_pc = extable.handler_pc(entry_index);
2670 entry->catchType = extable.catch_type_index(entry_index);
2671 JVM_END
2672
2673
2674 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2675 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2676 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2677 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2678 return method->exception_table_length();
2679 JVM_END
2680
2681
2682 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2683 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2684 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2685 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2686 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2687 JVM_END
2688
2689
2690 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2691 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2692 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2693 return InstanceKlass::cast(k)->field_access_flags(field_index);
2694 JVM_END
2695
2696
2697 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2698 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2699 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2700 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2701 return method->max_locals();
2702 JVM_END
2703
2704
2705 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2706 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2707 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2708 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2709 return method->size_of_parameters();
2710 JVM_END
2711
2712
2713 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2714 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2715 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2716 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2717 return method->verifier_max_stack();
2718 JVM_END
2719
2720
2721 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2722 ResourceMark rm(THREAD);
2723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2724 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2725 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2726 return method->is_object_constructor();
2727 JVM_END
2728
2729
2730 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2731 ResourceMark rm(THREAD);
2732 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2733 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2734 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2735 return method->is_overpass();
2736 JVM_END
2737
2738 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2739 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2740 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2741 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2742 return method->name()->as_utf8();
2743 JVM_END
2744
2745
2746 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2747 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2748 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2749 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2750 return method->signature()->as_utf8();
2751 JVM_END
2752
2753 /**
2754 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2755 * read entries in the constant pool. Since the old verifier always
2756 * works on a copy of the code, it will not see any rewriting that
2757 * may possibly occur in the middle of verification. So it is important
2758 * that nothing it calls tries to use the cpCache instead of the raw
2759 * constant pool, so we must use cp->uncached_x methods when appropriate.
2760 */
2761 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2762 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2763 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2764 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2765 switch (cp->tag_at(cp_index).value()) {
2766 case JVM_CONSTANT_Fieldref:
2767 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2768 default:
2769 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2770 }
2771 ShouldNotReachHere();
2772 return nullptr;
2773 JVM_END
2774
2775
2776 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2777 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2778 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2779 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2780 switch (cp->tag_at(cp_index).value()) {
2781 case JVM_CONSTANT_InterfaceMethodref:
2782 case JVM_CONSTANT_Methodref:
2783 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2784 default:
2785 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2786 }
2787 ShouldNotReachHere();
2788 return nullptr;
2789 JVM_END
2790
2791
2792 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2793 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2794 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2795 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2796 switch (cp->tag_at(cp_index).value()) {
2797 case JVM_CONSTANT_InterfaceMethodref:
2798 case JVM_CONSTANT_Methodref:
2799 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2800 default:
2801 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2802 }
2803 ShouldNotReachHere();
2804 return nullptr;
2805 JVM_END
2806
2807
2808 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2809 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2810 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2811 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2812 switch (cp->tag_at(cp_index).value()) {
2813 case JVM_CONSTANT_Fieldref:
2814 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2815 default:
2816 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2817 }
2818 ShouldNotReachHere();
2819 return nullptr;
2820 JVM_END
2821
2822
2823 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2824 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2825 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2826 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2827 Symbol* classname = cp->klass_name_at(cp_index);
2828 return classname->as_utf8();
2829 JVM_END
2830
2831
2832 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2833 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2834 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2835 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2836 switch (cp->tag_at(cp_index).value()) {
2837 case JVM_CONSTANT_Fieldref: {
2838 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2839 Symbol* classname = cp->klass_name_at(class_index);
2840 return classname->as_utf8();
2841 }
2842 default:
2843 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2844 }
2845 ShouldNotReachHere();
2846 return nullptr;
2847 JVM_END
2848
2849
2850 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2851 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2852 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2853 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2854 switch (cp->tag_at(cp_index).value()) {
2855 case JVM_CONSTANT_Methodref:
2856 case JVM_CONSTANT_InterfaceMethodref: {
2857 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2858 Symbol* classname = cp->klass_name_at(class_index);
2859 return classname->as_utf8();
2860 }
2861 default:
2862 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2863 }
2864 ShouldNotReachHere();
2865 return nullptr;
2866 JVM_END
2867
2868
2869 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2870 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2871 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2872 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2873 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2874 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2875 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2876 switch (cp->tag_at(cp_index).value()) {
2877 case JVM_CONSTANT_Fieldref: {
2878 Symbol* name = cp->uncached_name_ref_at(cp_index);
2879 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2880 InstanceKlass* ik = InstanceKlass::cast(k_called);
2881 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2882 if (fs.name() == name && fs.signature() == signature) {
2883 return fs.access_flags().as_short();
2884 }
2885 }
2886 return -1;
2887 }
2888 default:
2889 fatal("JVM_GetCPFieldModifiers: illegal constant");
2890 }
2891 ShouldNotReachHere();
2892 return 0;
2893 JVM_END
2894
2895
2896 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2897 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2898 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2899 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2900 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2901 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2902 switch (cp->tag_at(cp_index).value()) {
2903 case JVM_CONSTANT_Methodref:
2904 case JVM_CONSTANT_InterfaceMethodref: {
2905 Symbol* name = cp->uncached_name_ref_at(cp_index);
2906 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2907 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2908 int methods_count = methods->length();
2909 for (int i = 0; i < methods_count; i++) {
2910 Method* method = methods->at(i);
2911 if (method->name() == name && method->signature() == signature) {
2912 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2913 }
2914 }
2915 return -1;
2916 }
2917 default:
2918 fatal("JVM_GetCPMethodModifiers: illegal constant");
2919 }
2920 ShouldNotReachHere();
2921 return 0;
2922 JVM_END
2923
2924
2925 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2926
2927 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2928 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2929 JVM_END
2930
2931
2932 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2933 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2934 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2935 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2936 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2937 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2938 JVM_END
2939
2940 // Printing support //////////////////////////////////////////////////
2941 extern "C" {
2942
2943 ATTRIBUTE_PRINTF(3, 0)
2944 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2945 // Reject count values that are negative signed values converted to
2946 // unsigned; see bug 4399518, 4417214
2947 if ((intptr_t)count <= 0) return -1;
2948
2949 int result = os::vsnprintf(str, count, fmt, args);
2950 if (result > 0 && (size_t)result >= count) {
2951 result = -1;
2952 }
2953
2954 return result;
2955 }
2956
2957 ATTRIBUTE_PRINTF(3, 4)
2958 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2959 va_list args;
2960 int len;
2961 va_start(args, fmt);
2962 len = jio_vsnprintf(str, count, fmt, args);
2963 va_end(args);
2964 return len;
2965 }
2966
2967 ATTRIBUTE_PRINTF(2, 3)
2968 int jio_fprintf(FILE* f, const char *fmt, ...) {
2969 int len;
2970 va_list args;
2971 va_start(args, fmt);
2972 len = jio_vfprintf(f, fmt, args);
2973 va_end(args);
2974 return len;
2975 }
2976
2977 ATTRIBUTE_PRINTF(2, 0)
2978 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2979 if (Arguments::vfprintf_hook() != nullptr) {
2980 return Arguments::vfprintf_hook()(f, fmt, args);
2981 } else {
2982 return vfprintf(f, fmt, args);
2983 }
2984 }
2985
2986 ATTRIBUTE_PRINTF(1, 2)
2987 JNIEXPORT int jio_printf(const char *fmt, ...) {
2988 int len;
2989 va_list args;
2990 va_start(args, fmt);
2991 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2992 va_end(args);
2993 return len;
2994 }
2995
2996 // HotSpot specific jio method
2997 void jio_print(const char* s, size_t len) {
2998 // Try to make this function as atomic as possible.
2999 if (Arguments::vfprintf_hook() != nullptr) {
3000 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
3001 } else {
3002 // Make an unused local variable to avoid warning from gcc compiler.
3003 bool dummy = os::write(defaultStream::output_fd(), s, len);
3004 }
3005 }
3006
3007 } // Extern C
3008
3009 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3010
3011 // In most of the JVM thread support functions we need to access the
3012 // thread through a ThreadsListHandle to prevent it from exiting and
3013 // being reclaimed while we try to operate on it. The exceptions to this
3014 // rule are when operating on the current thread, or if the monitor of
3015 // the target java.lang.Thread is locked at the Java level - in both
3016 // cases the target cannot exit.
3017
3018 static void thread_entry(JavaThread* thread, TRAPS) {
3019 HandleMark hm(THREAD);
3020 Handle obj(THREAD, thread->threadObj());
3021 JavaValue result(T_VOID);
3022 JavaCalls::call_virtual(&result,
3023 obj,
3024 vmClasses::Thread_klass(),
3025 vmSymbols::run_method_name(),
3026 vmSymbols::void_method_signature(),
3027 THREAD);
3028 }
3029
3030
3031 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3032 #if INCLUDE_CDS
3033 if (CDSConfig::is_dumping_static_archive()) {
3034 // During java -Xshare:dump, if we allow multiple Java threads to
3035 // execute in parallel, symbols and classes may be loaded in
3036 // random orders which will make the resulting CDS archive
3037 // non-deterministic.
3038 //
3039 // Lucikly, during java -Xshare:dump, it's important to run only
3040 // the code in the main Java thread (which is NOT started here) that
3041 // creates the module graph, etc. It's safe to not start the other
3042 // threads which are launched by class static initializers
3043 // (ReferenceHandler, FinalizerThread and CleanerImpl).
3044 if (log_is_enabled(Info, cds)) {
3045 ResourceMark rm;
3046 oop t = JNIHandles::resolve_non_null(jthread);
3047 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
3048 }
3049 return;
3050 }
3051 #endif
3052 JavaThread *native_thread = nullptr;
3053
3054 // We cannot hold the Threads_lock when we throw an exception,
3055 // due to rank ordering issues. Example: we might need to grab the
3056 // Heap_lock while we construct the exception.
3057 bool throw_illegal_thread_state = false;
3058
3059 // We must release the Threads_lock before we can post a jvmti event
3060 // in Thread::start.
3061 {
3062 // Ensure that the C++ Thread and OSThread structures aren't freed before
3063 // we operate.
3064 MutexLocker mu(Threads_lock);
3065
3066 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3067 // re-starting an already started thread, so we should usually find
3068 // that the JavaThread is null. However for a JNI attached thread
3069 // there is a small window between the Thread object being created
3070 // (with its JavaThread set) and the update to its threadStatus, so we
3071 // have to check for this
3072 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
3073 throw_illegal_thread_state = true;
3074 } else {
3075 jlong size =
3076 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3077 // Allocate the C++ Thread structure and create the native thread. The
3078 // stack size retrieved from java is 64-bit signed, but the constructor takes
3079 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3080 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3081 // - Avoid passing negative values which would result in really large stacks.
3082 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3083 size_t sz = size > 0 ? (size_t) size : 0;
3084 native_thread = new JavaThread(&thread_entry, sz);
3085
3086 // At this point it may be possible that no osthread was created for the
3087 // JavaThread due to lack of memory. Check for this situation and throw
3088 // an exception if necessary. Eventually we may want to change this so
3089 // that we only grab the lock if the thread was created successfully -
3090 // then we can also do this check and throw the exception in the
3091 // JavaThread constructor.
3092 if (native_thread->osthread() != nullptr) {
3093 // Note: the current thread is not being used within "prepare".
3094 native_thread->prepare(jthread);
3095 }
3096 }
3097 }
3098
3099 if (throw_illegal_thread_state) {
3100 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3101 }
3102
3103 assert(native_thread != nullptr, "Starting null thread?");
3104
3105 if (native_thread->osthread() == nullptr) {
3106 ResourceMark rm(thread);
3107 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3108 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3109 // No one should hold a reference to the 'native_thread'.
3110 native_thread->smr_delete();
3111 if (JvmtiExport::should_post_resource_exhausted()) {
3112 JvmtiExport::post_resource_exhausted(
3113 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3114 os::native_thread_creation_failed_msg());
3115 }
3116 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3117 os::native_thread_creation_failed_msg());
3118 }
3119
3120 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3121
3122 Thread::start(native_thread);
3123
3124 JVM_END
3125
3126
3127 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3128 ThreadsListHandle tlh(thread);
3129 oop java_thread = nullptr;
3130 JavaThread* receiver = nullptr;
3131 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3132 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3133
3134 if (is_alive) {
3135 // jthread refers to a live JavaThread.
3136 Thread::set_priority(receiver, (ThreadPriority)prio);
3137 }
3138 // Implied else: If the JavaThread hasn't started yet, then the
3139 // priority set in the java.lang.Thread object above will be pushed
3140 // down when it does start.
3141 JVM_END
3142
3143
3144 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3145 if (os::dont_yield()) return;
3146 HOTSPOT_THREAD_YIELD();
3147 os::naked_yield();
3148 JVM_END
3149
3150 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3151 if (nanos < 0) {
3152 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3153 }
3154
3155 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3156 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3157 }
3158
3159 // Save current thread state and restore it at the end of this block.
3160 // And set new thread state to SLEEPING.
3161 JavaThreadSleepState jtss(thread);
3162
3163 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3164
3165 if (nanos == 0) {
3166 os::naked_yield();
3167 } else {
3168 ThreadState old_state = thread->osthread()->get_state();
3169 thread->osthread()->set_state(SLEEPING);
3170 if (!thread->sleep_nanos(nanos)) { // interrupted
3171 // An asynchronous exception could have been thrown on
3172 // us while we were sleeping. We do not overwrite those.
3173 if (!HAS_PENDING_EXCEPTION) {
3174 HOTSPOT_THREAD_SLEEP_END(1);
3175
3176 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3177 // to properly restore the thread state. That's likely wrong.
3178 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3179 }
3180 }
3181 thread->osthread()->set_state(old_state);
3182 }
3183 HOTSPOT_THREAD_SLEEP_END(0);
3184 JVM_END
3185
3186 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3187 oop jthread = thread->threadObj();
3188 assert(jthread != nullptr, "no current carrier thread!");
3189 return JNIHandles::make_local(THREAD, jthread);
3190 JVM_END
3191
3192 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3193 oop theThread = thread->vthread();
3194 assert(theThread != (oop)nullptr, "no current thread!");
3195 return JNIHandles::make_local(THREAD, theThread);
3196 JVM_END
3197
3198 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3199 jobject theThread))
3200 oop threadObj = JNIHandles::resolve(theThread);
3201 thread->set_vthread(threadObj);
3202 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3203 JVM_END
3204
3205 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3206 return ThreadIdentifier::unsafe_offset();
3207 JVM_END
3208
3209 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3210 ThreadsListHandle tlh(thread);
3211 JavaThread* receiver = nullptr;
3212 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3213 if (is_alive) {
3214 // jthread refers to a live JavaThread.
3215 receiver->interrupt();
3216 }
3217 JVM_END
3218
3219 // Return true iff the current thread has locked the object passed in
3220
3221 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3222 if (obj == nullptr) {
3223 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3224 }
3225 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3226 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3227 JVM_END
3228
3229 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3230 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3231 return JNIHandles::make_local(THREAD, trace);
3232 JVM_END
3233
3234 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3235 // We don't use a ThreadsListHandle here because the current thread
3236 // must be alive.
3237 oop java_thread = JNIHandles::resolve_non_null(jthread);
3238 JavaThread* thr = java_lang_Thread::thread(java_thread);
3239 if (thread == thr && !thr->has_attached_via_jni()) {
3240 // Thread naming is only supported for the current thread and
3241 // we don't set the name of an attached thread to avoid stepping
3242 // on other programs.
3243 ResourceMark rm(thread);
3244 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3245 os::set_native_thread_name(thread_name);
3246 }
3247 JVM_END
3248
3249 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3250 oop theCache = thread->scopedValueCache();
3251 return JNIHandles::make_local(THREAD, theCache);
3252 JVM_END
3253
3254 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3255 jobject theCache))
3256 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3257 thread->set_scopedValueCache(objs);
3258 JVM_END
3259
3260 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3261
3262 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3263 ResourceMark rm(THREAD);
3264 JvmtiVMObjectAllocEventCollector oam;
3265 vframeStream vfst(thread);
3266
3267 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3268 // This must only be called from SecurityManager.getClassContext
3269 Method* m = vfst.method();
3270 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3271 m->name() == vmSymbols::getClassContext_name() &&
3272 m->signature() == vmSymbols::void_class_array_signature())) {
3273 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3274 }
3275 }
3276
3277 // Collect method holders
3278 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3279 for (; !vfst.at_end(); vfst.security_next()) {
3280 Method* m = vfst.method();
3281 // Native frames are not returned
3282 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3283 Klass* holder = m->method_holder();
3284 assert(holder->is_klass(), "just checking");
3285 klass_array->append(holder);
3286 }
3287 }
3288
3289 // Create result array of type [Ljava/lang/Class;
3290 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3291 // Fill in mirrors corresponding to method holders
3292 for (int i = 0; i < klass_array->length(); i++) {
3293 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3294 }
3295
3296 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3297 JVM_END
3298
3299
3300 // java.lang.Package ////////////////////////////////////////////////////////////////
3301
3302
3303 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3304 ResourceMark rm(THREAD);
3305 JvmtiVMObjectAllocEventCollector oam;
3306 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3307 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3308 return (jstring) JNIHandles::make_local(THREAD, result);
3309 JVM_END
3310
3311
3312 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3313 JvmtiVMObjectAllocEventCollector oam;
3314 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3315 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3316 JVM_END
3317
3318
3319 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3320
3321
3322 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3323 MonitorLocker ml(Heap_lock);
3324 oop ref = Universe::reference_pending_list();
3325 if (ref != nullptr) {
3326 Universe::clear_reference_pending_list();
3327 }
3328 return JNIHandles::make_local(THREAD, ref);
3329 JVM_END
3330
3331 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3332 MonitorLocker ml(Heap_lock);
3333 return Universe::has_reference_pending_list();
3334 JVM_END
3335
3336 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3337 MonitorLocker ml(Heap_lock);
3338 while (!Universe::has_reference_pending_list()) {
3339 ml.wait();
3340 }
3341 JVM_END
3342
3343 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3344 oop ref_oop = JNIHandles::resolve_non_null(ref);
3345 // PhantomReference has it's own implementation of refersTo().
3346 // See: JVM_PhantomReferenceRefersTo
3347 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3348 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3349 return referent == JNIHandles::resolve(o);
3350 JVM_END
3351
3352 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3353 oop ref_oop = JNIHandles::resolve_non_null(ref);
3354 // FinalReference has it's own implementation of clear().
3355 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3356 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3357 // If the referent has already been cleared then done.
3358 // However, if the referent is dead but has not yet been cleared by
3359 // concurrent reference processing, it should NOT be cleared here.
3360 // Instead, clearing should be left to the GC. Clearing it here could
3361 // detectably lose an expected notification, which is impossible with
3362 // STW reference processing. The clearing in enqueue() doesn't have
3363 // this problem, since the enqueue covers the notification, but it's not
3364 // worth the effort to handle that case specially.
3365 return;
3366 }
3367 java_lang_ref_Reference::clear_referent(ref_oop);
3368 JVM_END
3369
3370
3371 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3372
3373
3374 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3375 oop ref_oop = JNIHandles::resolve_non_null(ref);
3376 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3377 return referent == JNIHandles::resolve(o);
3378 JVM_END
3379
3380
3381 // ObjectInputStream ///////////////////////////////////////////////////////////////
3382
3383 // Return the first user-defined class loader up the execution stack, or null
3384 // if only code from the bootstrap or platform class loader is on the stack.
3385
3386 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3387 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3388 InstanceKlass* ik = vfst.method()->method_holder();
3389 oop loader = ik->class_loader();
3390 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3391 // Skip reflection related frames
3392 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
3393 return JNIHandles::make_local(THREAD, loader);
3394 }
3395 }
3396 }
3397 return nullptr;
3398 JVM_END
3399
3400
3401 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3402
3403
3404 // resolve array handle and check arguments
3405 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3406 if (arr == nullptr) {
3407 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3408 }
3409 oop a = JNIHandles::resolve_non_null(arr);
3410 if (!a->is_array()) {
3411 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3412 } else if (type_array_only && !a->is_typeArray()) {
3413 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3414 }
3415 return arrayOop(a);
3416 }
3417
3418
3419 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3420 arrayOop a = check_array(env, arr, false, CHECK_0);
3421 return a->length();
3422 JVM_END
3423
3424
3425 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3426 JvmtiVMObjectAllocEventCollector oam;
3427 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3428 jvalue value;
3429 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3430 oop box = Reflection::box(&value, type, CHECK_NULL);
3431 return JNIHandles::make_local(THREAD, box);
3432 JVM_END
3433
3434
3435 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3436 jvalue value;
3437 value.i = 0; // to initialize value before getting used in CHECK
3438 arrayOop a = check_array(env, arr, true, CHECK_(value));
3439 assert(a->is_typeArray(), "just checking");
3440 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3441 BasicType wide_type = (BasicType) wCode;
3442 if (type != wide_type) {
3443 Reflection::widen(&value, type, wide_type, CHECK_(value));
3444 }
3445 return value;
3446 JVM_END
3447
3448
3449 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3450 arrayOop a = check_array(env, arr, false, CHECK);
3451 oop box = JNIHandles::resolve(val);
3452 jvalue value;
3453 value.i = 0; // to initialize value before getting used in CHECK
3454 BasicType value_type;
3455 if (a->is_objArray()) {
3456 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3457 value_type = Reflection::unbox_for_regular_object(box, &value);
3458 } else {
3459 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3460 }
3461 Reflection::array_set(&value, a, index, value_type, CHECK);
3462 JVM_END
3463
3464
3465 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3466 arrayOop a = check_array(env, arr, true, CHECK);
3467 assert(a->is_typeArray(), "just checking");
3468 BasicType value_type = (BasicType) vCode;
3469 Reflection::array_set(&v, a, index, value_type, CHECK);
3470 JVM_END
3471
3472
3473 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3474 JvmtiVMObjectAllocEventCollector oam;
3475 oop element_mirror = JNIHandles::resolve(eltClass);
3476 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3477 return JNIHandles::make_local(THREAD, result);
3478 JVM_END
3479
3480
3481 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3482 JvmtiVMObjectAllocEventCollector oam;
3483 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3484 oop element_mirror = JNIHandles::resolve(eltClass);
3485 assert(dim_array->is_typeArray(), "just checking");
3486 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3487 return JNIHandles::make_local(THREAD, result);
3488 JVM_END
3489
3490
3491 // Library support ///////////////////////////////////////////////////////////////////////////
3492
3493 JVM_LEAF(void*, JVM_LoadZipLibrary())
3494 return ZipLibrary::handle();
3495 JVM_END
3496
3497 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3498 //%note jvm_ct
3499 char ebuf[1024];
3500 void *load_result;
3501 {
3502 ThreadToNativeFromVM ttnfvm(thread);
3503 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3504 }
3505 if (load_result == nullptr) {
3506 if (throwException) {
3507 char msg[1024];
3508 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3509 // Since 'ebuf' may contain a string encoded using
3510 // platform encoding scheme, we need to pass
3511 // Exceptions::unsafe_to_utf8 to the new_exception method
3512 // as the last argument. See bug 6367357.
3513 Handle h_exception =
3514 Exceptions::new_exception(thread,
3515 vmSymbols::java_lang_UnsatisfiedLinkError(),
3516 msg, Exceptions::unsafe_to_utf8);
3517
3518 THROW_HANDLE_NULL(h_exception);
3519 } else {
3520 log_info(library)("Failed to load library %s", name);
3521 return load_result;
3522 }
3523 }
3524 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3525 return load_result;
3526 JVM_END
3527
3528
3529 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3530 os::dll_unload(handle);
3531 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3532 JVM_END
3533
3534
3535 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3536 void* find_result = os::dll_lookup(handle, name);
3537 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3538 find_result != nullptr ? "Found" : "Failed to find",
3539 name, p2i(handle));
3540 return find_result;
3541 JVM_END
3542
3543
3544 // JNI version ///////////////////////////////////////////////////////////////////////////////
3545
3546 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3547 return Threads::is_supported_jni_version_including_1_1(version);
3548 JVM_END
3549
3550
3551 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3552 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3553 JVM_END
3554
3555 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3556 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3557 JVM_END
3558
3559 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3560 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3561 JVM_END
3562
3563 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3564 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3565 JVM_END
3566
3567 JVM_ENTRY_NO_ENV(jboolean, JVM_IsStaticallyLinked(void))
3568 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3569 JVM_END
3570
3571 // String support ///////////////////////////////////////////////////////////////////////////
3572
3573 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3574 JvmtiVMObjectAllocEventCollector oam;
3575 if (str == nullptr) return nullptr;
3576 oop string = JNIHandles::resolve_non_null(str);
3577 oop result = StringTable::intern(string, CHECK_NULL);
3578 return (jstring) JNIHandles::make_local(THREAD, result);
3579 JVM_END
3580
3581
3582 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3583
3584 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3585 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3586 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3587 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3588 // nature. JavaThreads will be "in native" when using this API from JDK code.
3589
3590
3591 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3592 VM_Exit::block_if_vm_exited();
3593 return new PlatformMutex();
3594 }
3595
3596
3597 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3598 VM_Exit::block_if_vm_exited();
3599 delete ((PlatformMutex*) mon);
3600 }
3601
3602
3603 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3604 VM_Exit::block_if_vm_exited();
3605 ((PlatformMutex*) mon)->lock();
3606 return 0;
3607 }
3608
3609
3610 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3611 VM_Exit::block_if_vm_exited();
3612 ((PlatformMutex*) mon)->unlock();
3613 }
3614
3615
3616 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3617
3618 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3619 Handle loader, Handle protection_domain,
3620 jboolean throwError, TRAPS) {
3621 // Security Note:
3622 // The Java level wrapper will perform the necessary security check allowing
3623 // us to pass the null as the initiating class loader. The VM is responsible for
3624 // the checkPackageAccess relative to the initiating class loader via the
3625 // protection_domain. The protection_domain is passed as null by the java code
3626 // if there is no security manager in 3-arg Class.forName().
3627 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3628
3629 // Check if we should initialize the class
3630 if (init && klass->is_instance_klass()) {
3631 klass->initialize(CHECK_NULL);
3632 }
3633 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3634 }
3635
3636
3637 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3638
3639 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3640 Handle method_handle;
3641 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3642 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3643 Handle receiver(THREAD, JNIHandles::resolve(obj));
3644 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3645 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3646 jobject res = JNIHandles::make_local(THREAD, result);
3647 if (JvmtiExport::should_post_vm_object_alloc()) {
3648 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3649 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3650 if (java_lang_Class::is_primitive(ret_type)) {
3651 // Only for primitive type vm allocates memory for java object.
3652 // See box() method.
3653 JvmtiExport::post_vm_object_alloc(thread, result);
3654 }
3655 }
3656 return res;
3657 } else {
3658 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3659 }
3660 JVM_END
3661
3662
3663 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3664 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3665 oop constructor_mirror = JNIHandles::resolve(c);
3666 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3667 jobject res = JNIHandles::make_local(THREAD, result);
3668 if (JvmtiExport::should_post_vm_object_alloc()) {
3669 JvmtiExport::post_vm_object_alloc(thread, result);
3670 }
3671 return res;
3672 JVM_END
3673
3674 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3675 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3676 assert(k->is_klass(), "just checking");
3677 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3678 JVM_END
3679
3680 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3681 jclass caller,
3682 jstring interfaceMethodName,
3683 jobject factoryType,
3684 jobject interfaceMethodType,
3685 jobject implementationMember,
3686 jobject dynamicMethodType,
3687 jclass lambdaProxyClass))
3688 #if INCLUDE_CDS
3689 if (!CDSConfig::is_dumping_archive()) {
3690 return;
3691 }
3692
3693 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3694 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3695 if (caller_ik->is_hidden()) {
3696 // Hidden classes not of type lambda proxy classes are currently not being archived.
3697 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3698 // registered for archiving.
3699 return;
3700 }
3701 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3702 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3703 assert(lambda_ik->is_hidden(), "must be a hidden class");
3704 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3705
3706 Symbol* interface_method_name = nullptr;
3707 if (interfaceMethodName != nullptr) {
3708 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3709 }
3710 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3711 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3712
3713 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3714 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3715
3716 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3717 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3718 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3719
3720 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3721 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3722
3723 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3724 interface_method_type, m, dynamic_method_type, THREAD);
3725 #endif // INCLUDE_CDS
3726 JVM_END
3727
3728 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3729 jclass caller,
3730 jstring interfaceMethodName,
3731 jobject factoryType,
3732 jobject interfaceMethodType,
3733 jobject implementationMember,
3734 jobject dynamicMethodType))
3735 #if INCLUDE_CDS
3736
3737 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3738 implementationMember == nullptr || dynamicMethodType == nullptr) {
3739 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3740 }
3741
3742 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3743 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3744 if (!caller_ik->is_shared()) {
3745 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3746 return nullptr;
3747 }
3748
3749 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3750 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3751 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3752
3753 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3754 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3755
3756 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3757 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3758 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3759
3760 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3761 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3762
3763 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3764 interface_method_type, m, dynamic_method_type);
3765 jclass jcls = nullptr;
3766 if (lambda_ik != nullptr) {
3767 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3768 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3769 }
3770 return jcls;
3771 #else
3772 return nullptr;
3773 #endif // INCLUDE_CDS
3774 JVM_END
3775
3776 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3777 if (CDSConfig::is_dumping_static_archive()) {
3778 // We do this so that the default CDS archive can be deterministic.
3779 const char* release = VM_Version::vm_release();
3780 const char* dbg_level = VM_Version::jdk_debug_level();
3781 const char* version = VM_Version::internal_vm_info_string();
3782 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3783 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3784 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3785 seed += (jlong)VM_Version::vm_major_version();
3786 seed += (jlong)VM_Version::vm_minor_version();
3787 seed += (jlong)VM_Version::vm_security_version();
3788 seed += (jlong)VM_Version::vm_patch_version();
3789 if (seed == 0) { // don't let this ever be zero.
3790 seed = 0x87654321;
3791 }
3792 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3793 return seed;
3794 } else {
3795 return 0;
3796 }
3797 JVM_END
3798
3799 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3800 return CDSConfig::get_status();
3801 JVM_END
3802
3803 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3804 #if INCLUDE_CDS
3805 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3806 if (line != nullptr) {
3807 ResourceMark rm(THREAD);
3808 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3809 char* c_line = java_lang_String::as_utf8_string(h_line());
3810 if (CDSConfig::is_dumping_dynamic_archive()) {
3811 // Note: LambdaFormInvokers::append take same format which is not
3812 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3813 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3814 }
3815 if (ClassListWriter::is_enabled()) {
3816 ClassListWriter w;
3817 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3818 }
3819 }
3820 #endif // INCLUDE_CDS
3821 JVM_END
3822
3823 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3824 #if INCLUDE_CDS
3825 ResourceMark rm(THREAD);
3826 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3827 char* file_name = java_lang_String::as_utf8_string(file_handle());
3828 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3829 #endif // INCLUDE_CDS
3830 JVM_END
3831
3832 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3833 #if INCLUDE_CDS
3834 ResourceMark rm(THREAD);
3835 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3836 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3837 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3838 #endif // INCLUDE_CDS
3839 JVM_END
3840
3841 // Returns an array of all live Thread objects (VM internal JavaThreads,
3842 // jvmti agent threads, and JNI attaching threads are skipped)
3843 // See CR 6404306 regarding JNI attaching threads
3844 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3845 ResourceMark rm(THREAD);
3846 ThreadsListEnumerator tle(THREAD, false, false);
3847 JvmtiVMObjectAllocEventCollector oam;
3848
3849 int num_threads = tle.num_threads();
3850 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3851 objArrayHandle threads_ah(THREAD, r);
3852
3853 for (int i = 0; i < num_threads; i++) {
3854 Handle h = tle.get_threadObj(i);
3855 threads_ah->obj_at_put(i, h());
3856 }
3857
3858 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3859 JVM_END
3860
3861
3862 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3863 // Return StackTraceElement[][], each element is the stack trace of a thread in
3864 // the corresponding entry in the given threads array
3865 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3866 JvmtiVMObjectAllocEventCollector oam;
3867
3868 // Check if threads is null
3869 if (threads == nullptr) {
3870 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3871 }
3872
3873 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3874 objArrayHandle ah(THREAD, a);
3875 int num_threads = ah->length();
3876 // check if threads is non-empty array
3877 if (num_threads == 0) {
3878 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3879 }
3880
3881 // check if threads is not an array of objects of Thread class
3882 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3883 if (k != vmClasses::Thread_klass()) {
3884 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3885 }
3886
3887 ResourceMark rm(THREAD);
3888
3889 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3890 for (int i = 0; i < num_threads; i++) {
3891 oop thread_obj = ah->obj_at(i);
3892 instanceHandle h(THREAD, (instanceOop) thread_obj);
3893 thread_handle_array->append(h);
3894 }
3895
3896 // The JavaThread references in thread_handle_array are validated
3897 // in VM_ThreadDump::doit().
3898 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3899 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3900
3901 JVM_END
3902
3903 // JVM monitoring and management support
3904 JVM_LEAF(void*, JVM_GetManagement(jint version))
3905 return Management::get_jmm_interface(version);
3906 JVM_END
3907
3908 // com.sun.tools.attach.VirtualMachine agent properties support
3909 //
3910 // Initialize the agent properties with the properties maintained in the VM
3911 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3912 ResourceMark rm;
3913
3914 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3915
3916 PUTPROP(props, "sun.java.command", Arguments::java_command());
3917 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3918 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3919 return properties;
3920 JVM_END
3921
3922 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3923 {
3924 JvmtiVMObjectAllocEventCollector oam;
3925
3926 if (ofClass == nullptr) {
3927 return nullptr;
3928 }
3929 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3930 // Special handling for primitive objects
3931 if (java_lang_Class::is_primitive(mirror())) {
3932 return nullptr;
3933 }
3934 Klass* k = java_lang_Class::as_Klass(mirror());
3935 if (!k->is_instance_klass()) {
3936 return nullptr;
3937 }
3938 InstanceKlass* ik = InstanceKlass::cast(k);
3939 int encl_method_class_idx = ik->enclosing_method_class_index();
3940 if (encl_method_class_idx == 0) {
3941 return nullptr;
3942 }
3943 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3944 objArrayHandle dest(THREAD, dest_o);
3945 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3946 dest->obj_at_put(0, enc_k->java_mirror());
3947 int encl_method_method_idx = ik->enclosing_method_method_index();
3948 if (encl_method_method_idx != 0) {
3949 Symbol* sym = ik->constants()->symbol_at(
3950 extract_low_short_from_int(
3951 ik->constants()->name_and_type_at(encl_method_method_idx)));
3952 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3953 dest->obj_at_put(1, str());
3954 sym = ik->constants()->symbol_at(
3955 extract_high_short_from_int(
3956 ik->constants()->name_and_type_at(encl_method_method_idx)));
3957 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3958 dest->obj_at_put(2, str());
3959 }
3960 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3961 }
3962 JVM_END
3963
3964 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3965 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3966 ResourceMark rm(THREAD);
3967
3968 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3969 return nullptr;
3970 }
3971
3972 char** vm_flags = Arguments::jvm_flags_array();
3973 char** vm_args = Arguments::jvm_args_array();
3974 int num_flags = Arguments::num_jvm_flags();
3975 int num_args = Arguments::num_jvm_args();
3976
3977 InstanceKlass* ik = vmClasses::String_klass();
3978 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3979 objArrayHandle result_h(THREAD, r);
3980
3981 int index = 0;
3982 for (int j = 0; j < num_flags; j++, index++) {
3983 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3984 result_h->obj_at_put(index, h());
3985 }
3986 for (int i = 0; i < num_args; i++, index++) {
3987 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3988 result_h->obj_at_put(index, h());
3989 }
3990 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3991 JVM_END
3992
3993 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3994 return os::get_signal_number(name);
3995 JVM_END
3996
3997 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3998 #if INCLUDE_JVMTI
3999 if (!DoJVMTIVirtualThreadTransitions) {
4000 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4001 return;
4002 }
4003 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4004 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
4005 } else {
4006 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4007 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
4008 }
4009 #endif
4010 JVM_END
4011
4012 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
4013 #if INCLUDE_JVMTI
4014 if (!DoJVMTIVirtualThreadTransitions) {
4015 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4016 return;
4017 }
4018 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4019 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
4020 } else {
4021 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4022 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
4023 }
4024 #endif
4025 JVM_END
4026
4027 // If notifications are disabled then just update the VTMS transition bit and return.
4028 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
4029 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
4030 #if INCLUDE_JVMTI
4031 if (!DoJVMTIVirtualThreadTransitions) {
4032 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4033 return;
4034 }
4035 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4036 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
4037 } else {
4038 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4039 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4040 }
4041 #endif
4042 JVM_END
4043
4044 // If notifications are disabled then just update the VTMS transition bit and return.
4045 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
4046 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
4047 #if INCLUDE_JVMTI
4048 if (!DoJVMTIVirtualThreadTransitions) {
4049 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4050 return;
4051 }
4052 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
4053 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
4054 } else {
4055 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
4056 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
4057 }
4058 #endif
4059 JVM_END
4060
4061 // Always update the temporary VTMS transition bit.
4062 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jclass clazz, jboolean hide))
4063 #if INCLUDE_JVMTI
4064 if (!DoJVMTIVirtualThreadTransitions) {
4065 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4066 return;
4067 }
4068 assert(!thread->is_in_VTMS_transition(), "sanity check");
4069 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
4070 thread->toggle_is_in_tmp_VTMS_transition();
4071 #endif
4072 JVM_END
4073
4074 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
4075 // Needed to avoid deadlocks with JVMTI suspend mechanism.
4076 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
4077 #if INCLUDE_JVMTI
4078 if (!DoJVMTIVirtualThreadTransitions) {
4079 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4080 return;
4081 }
4082 assert(thread->is_disable_suspend() != (bool)enter,
4083 "nested or unbalanced monitor enter/exit is not allowed");
4084 thread->toggle_is_disable_suspend();
4085 #endif
4086 JVM_END
4087
4088 /*
4089 * Return the current class's class file version. The low order 16 bits of the
4090 * returned jint contain the class's major version. The high order 16 bits
4091 * contain the class's minor version.
4092 */
4093 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4094 oop mirror = JNIHandles::resolve_non_null(current);
4095 if (java_lang_Class::is_primitive(mirror)) {
4096 // return latest major version and minor version of 0.
4097 return JVM_CLASSFILE_MAJOR_VERSION;
4098 }
4099 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4100
4101 Klass* c = java_lang_Class::as_Klass(mirror);
4102 assert(c->is_instance_klass(), "must be");
4103 InstanceKlass* ik = InstanceKlass::cast(c);
4104 return (ik->minor_version() << 16) | ik->major_version();
4105 JVM_END
4106
4107 /*
4108 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4109 * get the value will see a materialized value and not a scalar-replaced
4110 * null value.
4111 */
4112 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4113 JVM_EnsureMaterializedForStackWalk(env, value);
4114 JVM_END
4115
4116 /*
4117 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4118 */
4119 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4120 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4121 JVM_END