1 /*
2 * Copyright (c) 1997, 2023, 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/classListParser.hpp"
27 #include "cds/classListWriter.hpp"
28 #include "cds/dynamicArchive.hpp"
29 #include "cds/heapShared.hpp"
30 #include "cds/lambdaFormInvokers.hpp"
31 #include "classfile/classFileStream.hpp"
32 #include "classfile/classLoader.inline.hpp"
33 #include "classfile/classLoaderData.hpp"
34 #include "classfile/classLoaderData.inline.hpp"
35 #include "classfile/classLoadInfo.hpp"
36 #include "classfile/javaAssertions.hpp"
37 #include "classfile/javaClasses.inline.hpp"
38 #include "classfile/moduleEntry.hpp"
39 #include "classfile/modules.hpp"
40 #include "classfile/packageEntry.hpp"
41 #include "classfile/stringTable.hpp"
42 #include "classfile/symbolTable.hpp"
43 #include "classfile/systemDictionary.hpp"
44 #include "classfile/vmClasses.hpp"
45 #include "classfile/vmSymbols.hpp"
46 #include "gc/shared/collectedHeap.inline.hpp"
47 #include "interpreter/bytecode.hpp"
48 #include "interpreter/bytecodeUtils.hpp"
49 #include "jfr/jfrEvents.hpp"
50 #include "jvm.h"
51 #include "logging/log.hpp"
52 #include "memory/oopFactory.hpp"
53 #include "memory/referenceType.hpp"
54 #include "memory/resourceArea.hpp"
55 #include "memory/universe.hpp"
56 #include "oops/access.inline.hpp"
57 #include "oops/constantPool.hpp"
58 #include "oops/fieldStreams.inline.hpp"
59 #include "oops/instanceKlass.hpp"
60 #include "oops/klass.inline.hpp"
61 #include "oops/method.hpp"
62 #include "oops/recordComponent.hpp"
63 #include "oops/objArrayKlass.hpp"
64 #include "oops/objArrayOop.inline.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "prims/foreignGlobals.hpp"
67 #include "prims/jvm_misc.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiThreadState.inline.hpp"
70 #include "prims/stackwalk.hpp"
71 #include "runtime/arguments.hpp"
72 #include "runtime/atomic.hpp"
73 #include "runtime/continuation.hpp"
74 #include "runtime/globals_extension.hpp"
75 #include "runtime/handles.inline.hpp"
76 #include "runtime/init.hpp"
77 #include "runtime/interfaceSupport.inline.hpp"
78 #include "runtime/deoptimization.hpp"
79 #include "runtime/handshake.hpp"
80 #include "runtime/java.hpp"
81 #include "runtime/javaCalls.hpp"
82 #include "runtime/javaThread.hpp"
83 #include "runtime/jfieldIDWorkaround.hpp"
84 #include "runtime/jniHandles.inline.hpp"
85 #include "runtime/os.inline.hpp"
86 #include "runtime/osThread.hpp"
87 #include "runtime/perfData.hpp"
88 #include "runtime/reflection.hpp"
89 #include "runtime/synchronizer.hpp"
90 #include "runtime/threadIdentifier.hpp"
91 #include "runtime/threadSMR.hpp"
92 #include "runtime/vframe.inline.hpp"
93 #include "runtime/vmOperations.hpp"
94 #include "runtime/vm_version.hpp"
95 #include "services/attachListener.hpp"
96 #include "services/management.hpp"
97 #include "services/threadService.hpp"
98 #include "utilities/copy.hpp"
99 #include "utilities/defaultStream.hpp"
100 #include "utilities/dtrace.hpp"
101 #include "utilities/events.hpp"
102 #include "utilities/macros.hpp"
103 #include "utilities/utf8.hpp"
104 #if INCLUDE_CDS
105 #include "classfile/systemDictionaryShared.hpp"
106 #endif
107 #if INCLUDE_JFR
108 #include "jfr/jfr.hpp"
109 #endif
110 #if INCLUDE_MANAGEMENT
111 #include "services/finalizerService.hpp"
112 #endif
113
114 #include <errno.h>
115
116 /*
117 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
118 such ctors and calls MUST NOT come between an oop declaration/init and its
119 usage because if objects are move this may cause various memory stomps, bus
120 errors and segfaults. Here is a cookbook for causing so called "naked oop
121 failures":
122
123 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
124 // Object address to be held directly in mirror & not visible to GC
125 oop mirror = JNIHandles::resolve_non_null(ofClass);
126
127 // If this ctor can hit a safepoint, moving objects around, then
128 ComplexConstructor foo;
129
130 // Boom! mirror may point to JUNK instead of the intended object
131 (some dereference of mirror)
132
133 // Here's another call that may block for GC, making mirror stale
134 MutexLocker ml(some_lock);
135
136 // And here's an initializer that can result in a stale oop
137 // all in one step.
138 oop o = call_that_can_throw_exception(TRAPS);
139
140
141 The solution is to keep the oop declaration BELOW the ctor or function
142 call that might cause a GC, do another resolve to reassign the oop, or
143 consider use of a Handle instead of an oop so there is immunity from object
144 motion. But note that the "QUICK" entries below do not have a handlemark
145 and thus can only support use of handles passed in.
146 */
147
148 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
149 ResourceMark rm;
150 int line_number = -1;
151 const char * source_file = nullptr;
152 const char * trace = "explicit";
153 InstanceKlass* caller = nullptr;
154 JavaThread* jthread = THREAD;
155 if (jthread->has_last_Java_frame()) {
156 vframeStream vfst(jthread);
157
158 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
159 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
160 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
161 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
162 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
163
164 Method* last_caller = nullptr;
165
166 while (!vfst.at_end()) {
167 Method* m = vfst.method();
168 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
169 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
170 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
171 break;
172 }
173 last_caller = m;
174 vfst.next();
175 }
176 // if this is called from Class.forName0 and that is called from Class.forName,
177 // then print the caller of Class.forName. If this is Class.loadClass, then print
178 // that caller, otherwise keep quiet since this should be picked up elsewhere.
179 bool found_it = false;
180 if (!vfst.at_end() &&
181 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
182 vfst.method()->name() == vmSymbols::forName0_name()) {
183 vfst.next();
184 if (!vfst.at_end() &&
185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
186 vfst.method()->name() == vmSymbols::forName_name()) {
187 vfst.next();
188 found_it = true;
189 }
190 } else if (last_caller != nullptr &&
191 last_caller->method_holder()->name() ==
192 vmSymbols::java_lang_ClassLoader() &&
193 last_caller->name() == vmSymbols::loadClass_name()) {
194 found_it = true;
195 } else if (!vfst.at_end()) {
196 if (vfst.method()->is_native()) {
197 // JNI call
198 found_it = true;
199 }
200 }
201 if (found_it && !vfst.at_end()) {
202 // found the caller
203 caller = vfst.method()->method_holder();
204 line_number = vfst.method()->line_number_from_bci(vfst.bci());
205 if (line_number == -1) {
206 // show method name if it's a native method
207 trace = vfst.method()->name_and_sig_as_C_string();
208 }
209 Symbol* s = caller->source_file_name();
210 if (s != nullptr) {
211 source_file = s->as_C_string();
212 }
213 }
214 }
215 if (caller != nullptr) {
216 if (to_class != caller) {
217 const char * from = caller->external_name();
218 const char * to = to_class->external_name();
219 // print in a single call to reduce interleaving between threads
220 if (source_file != nullptr) {
221 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
222 } else {
223 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
224 }
225 }
226 }
227 }
228
229 void trace_class_resolution(Klass* to_class) {
230 EXCEPTION_MARK;
231 trace_class_resolution_impl(to_class, THREAD);
232 if (HAS_PENDING_EXCEPTION) {
233 CLEAR_PENDING_EXCEPTION;
234 }
235 }
236
237 // java.lang.System //////////////////////////////////////////////////////////////////////
238
239
240 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
241 return os::javaTimeMillis();
242 JVM_END
243
244 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
245 return os::javaTimeNanos();
246 JVM_END
247
248 // The function below is actually exposed by jdk.internal.misc.VM and not
249 // java.lang.System, but we choose to keep it here so that it stays next
250 // to JVM_CurrentTimeMillis and JVM_NanoTime
251
252 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
253 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
254
255 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
256 jlong seconds;
257 jlong nanos;
258
259 os::javaTimeSystemUTC(seconds, nanos);
260
261 // We're going to verify that the result can fit in a long.
262 // For that we need the difference in seconds between 'seconds'
263 // and 'offset_secs' to be such that:
264 // |seconds - offset_secs| < (2^63/10^9)
265 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
266 // which makes |seconds - offset_secs| < 2^33
267 // and we will prefer +/- 2^32 as the maximum acceptable diff
268 // as 2^32 has a more natural feel than 2^33...
269 //
270 // So if |seconds - offset_secs| >= 2^32 - we return a special
271 // sentinel value (-1) which the caller should take as an
272 // exception value indicating that the offset given to us is
273 // too far from range of the current time - leading to too big
274 // a nano adjustment. The caller is expected to recover by
275 // computing a more accurate offset and calling this method
276 // again. (For the record 2^32 secs is ~136 years, so that
277 // should rarely happen)
278 //
279 jlong diff = seconds - offset_secs;
280 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
281 return -1; // sentinel value: the offset is too far off the target
282 }
283
284 // return the adjustment. If you compute a time by adding
285 // this number of nanoseconds along with the number of seconds
286 // in the offset you should get the current UTC time.
287 return (diff * (jlong)1000000000) + nanos;
288 JVM_END
289
290 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
291 jobject dst, jint dst_pos, jint length))
292 // Check if we have null pointers
293 if (src == nullptr || dst == nullptr) {
294 THROW(vmSymbols::java_lang_NullPointerException());
295 }
296 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
297 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
298 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
299 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
300 // Do copy
301 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
302 JVM_END
303
304
305 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
306 JavaValue r(T_OBJECT);
307 // public synchronized Object put(Object key, Object value);
308 HandleMark hm(THREAD);
309 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
310 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
311 JavaCalls::call_virtual(&r,
312 props,
313 vmClasses::Properties_klass(),
314 vmSymbols::put_name(),
315 vmSymbols::object_object_object_signature(),
316 key_str,
317 value_str,
318 THREAD);
319 }
320
321
322 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
323
324 /*
325 * Return all of the system properties in a Java String array with alternating
326 * names and values from the jvm SystemProperty.
327 * Which includes some internal and all commandline -D defined properties.
328 */
329 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
330 ResourceMark rm(THREAD);
331 HandleMark hm(THREAD);
332 int ndx = 0;
333 int fixedCount = 2;
334
335 SystemProperty* p = Arguments::system_properties();
336 int count = Arguments::PropertyList_count(p);
337
338 // Allocate result String array
339 InstanceKlass* ik = vmClasses::String_klass();
340 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
341 objArrayHandle result_h(THREAD, r);
342
343 while (p != nullptr) {
344 const char * key = p->key();
345 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
346 const char * value = p->value();
347 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
348 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
349 result_h->obj_at_put(ndx * 2, key_str());
350 result_h->obj_at_put(ndx * 2 + 1, value_str());
351 ndx++;
352 }
353 p = p->next();
354 }
355
356 // Convert the -XX:MaxDirectMemorySize= command line flag
357 // to the sun.nio.MaxDirectMemorySize property.
358 // Do this after setting user properties to prevent people
359 // from setting the value with a -D option, as requested.
360 // Leave empty if not supplied
361 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
362 char as_chars[256];
363 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
364 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
365 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
366 result_h->obj_at_put(ndx * 2, key_str());
367 result_h->obj_at_put(ndx * 2 + 1, value_str());
368 ndx++;
369 }
370
371 // JVM monitoring and management support
372 // Add the sun.management.compiler property for the compiler's name
373 {
374 #undef CSIZE
375 #if defined(_LP64) || defined(_WIN64)
376 #define CSIZE "64-Bit "
377 #else
378 #define CSIZE
379 #endif // 64bit
380
381 #if COMPILER1_AND_COMPILER2
382 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
383 #else
384 #if defined(COMPILER1)
385 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
386 #elif defined(COMPILER2)
387 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
388 #elif INCLUDE_JVMCI
389 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
390 #else
391 const char* compiler_name = "";
392 #endif // compilers
393 #endif // COMPILER1_AND_COMPILER2
394
395 if (*compiler_name != '\0' &&
396 (Arguments::mode() != Arguments::_int)) {
397 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
398 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
399 result_h->obj_at_put(ndx * 2, key_str());
400 result_h->obj_at_put(ndx * 2 + 1, value_str());
401 ndx++;
402 }
403 }
404
405 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
406 JVM_END
407
408
409 /*
410 * Return the temporary directory that the VM uses for the attach
411 * and perf data files.
412 *
413 * It is important that this directory is well-known and the
414 * same for all VM instances. It cannot be affected by configuration
415 * variables such as java.io.tmpdir.
416 */
417 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
418 HandleMark hm(THREAD);
419 const char* temp_dir = os::get_temp_directory();
420 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
421 return (jstring) JNIHandles::make_local(THREAD, h());
422 JVM_END
423
424
425 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
426
427 extern volatile jint vm_created;
428
429 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
430 EventShutdown event;
431 if (event.should_commit()) {
432 event.set_reason("Shutdown requested from Java");
433 event.commit();
434 }
435 JVM_END
436
437
438 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
439 before_exit(thread, true);
440 vm_exit(code);
441 JVM_END
442
443
444 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
445 if (!DisableExplicitGC) {
446 EventSystemGC event;
447 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
448 Universe::heap()->collect(GCCause::_java_lang_system_gc);
449 event.commit();
450 }
451 JVM_END
452
453
454 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
455 return Universe::heap()->millis_since_last_whole_heap_examined();
456 JVM_END
457
458
459 static inline jlong convert_size_t_to_jlong(size_t val) {
460 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
461 NOT_LP64 (return (jlong)val;)
462 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
463 }
464
465 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
466 size_t n = Universe::heap()->capacity();
467 return convert_size_t_to_jlong(n);
468 JVM_END
469
470
471 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
472 size_t n = Universe::heap()->unused();
473 return convert_size_t_to_jlong(n);
474 JVM_END
475
476
477 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
478 size_t n = Universe::heap()->max_capacity();
479 return convert_size_t_to_jlong(n);
480 JVM_END
481
482
483 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
484 return os::active_processor_count();
485 JVM_END
486
487 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
488 #ifdef LINUX
489 if (UseContainerSupport) {
490 return JNI_TRUE;
491 }
492 #endif
493 return JNI_FALSE;
494 JVM_END
495
496 // java.lang.Throwable //////////////////////////////////////////////////////
497
498 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
499 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
500 java_lang_Throwable::fill_in_stack_trace(exception);
501 JVM_END
502
503 // java.lang.NullPointerException ///////////////////////////////////////////
504
505 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
506 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
507
508 oop exc = JNIHandles::resolve_non_null(throwable);
509
510 Method* method;
511 int bci;
512 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
513 return nullptr;
514 }
515 if (method->is_native()) {
516 return nullptr;
517 }
518
519 stringStream ss;
520 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
521 if (ok) {
522 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
523 return (jstring) JNIHandles::make_local(THREAD, result);
524 } else {
525 return nullptr;
526 }
527 JVM_END
528
529 // java.lang.StackTraceElement //////////////////////////////////////////////
530
531
532 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
533 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
534 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
535 objArrayHandle stack_trace(THREAD, st);
536 // Fill in the allocated stack trace
537 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
538 JVM_END
539
540
541 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
542 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
543 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
544 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
545 JVM_END
546
547
548 // java.lang.StackWalker //////////////////////////////////////////////////////
549
550
551 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
552 jint skip_frames, jobject contScope, jobject cont,
553 jint frame_count, jint start_index, jobjectArray frames))
554 if (!thread->has_last_Java_frame()) {
555 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
556 }
557
558 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
559 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
560 Handle cont_h(THREAD, JNIHandles::resolve(cont));
561 // frames array is a Class<?>[] array when only getting caller reference,
562 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
563 // be null.
564 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
565 objArrayHandle frames_array_h(THREAD, fa);
566
567 int limit = start_index + frame_count;
568 if (frames_array_h->length() < limit) {
569 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
570 }
571
572 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
573 frame_count, start_index, frames_array_h, CHECK_NULL);
574 return JNIHandles::make_local(THREAD, result);
575 JVM_END
576
577
578 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
579 jint frame_count, jint start_index,
580 jobjectArray frames))
581 // frames array is a Class<?>[] array when only getting caller reference,
582 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
583 // be null.
584 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
585 objArrayHandle frames_array_h(THREAD, fa);
586
587 int limit = start_index+frame_count;
588 if (frames_array_h->length() < limit) {
589 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
590 }
591
592 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
593 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
594 start_index, frames_array_h, THREAD);
595 JVM_END
596
597 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
598 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
599 objArrayHandle frames_array_h(THREAD, fa);
600 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
601 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
602
603 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
604 JVM_END
605
606 // java.lang.Object ///////////////////////////////////////////////
607
608
609 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
610 // as implemented in the classic virtual machine; return 0 if object is null
611 return handle == nullptr ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
612 JVM_END
613
614
615 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
616 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
617 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
618 if (JvmtiExport::should_post_monitor_wait()) {
619 JvmtiExport::post_monitor_wait(thread, obj(), ms);
620
621 // The current thread already owns the monitor and it has not yet
622 // been added to the wait queue so the current thread cannot be
623 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
624 // event handler cannot accidentally consume an unpark() meant for
625 // the ParkEvent associated with this ObjectMonitor.
626 }
627 ObjectSynchronizer::wait(obj, ms, CHECK);
628 JVM_END
629
630
631 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
632 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
633 ObjectSynchronizer::notify(obj, CHECK);
634 JVM_END
635
636
637 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
638 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
639 ObjectSynchronizer::notifyall(obj, CHECK);
640 JVM_END
641
642
643 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
644 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
645 Klass* klass = obj->klass();
646 JvmtiVMObjectAllocEventCollector oam;
647
648 #ifdef ASSERT
649 // Just checking that the cloneable flag is set correct
650 if (obj->is_array()) {
651 guarantee(klass->is_cloneable(), "all arrays are cloneable");
652 } else {
653 guarantee(obj->is_instance(), "should be instanceOop");
654 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
655 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
656 }
657 #endif
658
659 // Check if class of obj supports the Cloneable interface.
660 // All arrays are considered to be cloneable (See JLS 20.1.5).
661 // All j.l.r.Reference classes are considered non-cloneable.
662 if (!klass->is_cloneable() ||
663 (klass->is_instance_klass() &&
664 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
665 ResourceMark rm(THREAD);
666 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
667 }
668
669 // Make shallow object copy
670 const size_t size = obj->size();
671 oop new_obj_oop = nullptr;
672 if (obj->is_array()) {
673 const int length = ((arrayOop)obj())->length();
674 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
675 /* do_zero */ true, CHECK_NULL);
676 } else {
677 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
678 }
679
680 HeapAccess<>::clone(obj(), new_obj_oop, size);
681
682 Handle new_obj(THREAD, new_obj_oop);
683 // Caution: this involves a java upcall, so the clone should be
684 // "gc-robust" by this stage.
685 if (klass->has_finalizer()) {
686 assert(obj->is_instance(), "should be instanceOop");
687 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
688 new_obj = Handle(THREAD, new_obj_oop);
689 }
690
691 return JNIHandles::make_local(THREAD, new_obj());
692 JVM_END
693
694 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
695
696 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
697 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
698 JVM_END
699
700 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
701 return InstanceKlass::is_finalization_enabled();
702 JVM_END
703
704 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
705
706 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
707 CONT_RegisterNativeMethods(env, cls);
708 JVM_END
709
710 // java.io.File ///////////////////////////////////////////////////////////////
711
712 JVM_LEAF(char*, JVM_NativePath(char* path))
713 return os::native_path(path);
714 JVM_END
715
716
717 // Misc. class handling ///////////////////////////////////////////////////////////
718
719
720 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
721 // Getting the class of the caller frame.
722 //
723 // The call stack at this point looks something like this:
724 //
725 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
726 // [1] [ @CallerSensitive API.method ]
727 // [.] [ (skipped intermediate frames) ]
728 // [n] [ caller ]
729 vframeStream vfst(thread);
730 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
731 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
732 Method* m = vfst.method();
733 assert(m != nullptr, "sanity");
734 switch (n) {
735 case 0:
736 // This must only be called from Reflection.getCallerClass
737 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
738 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
739 }
740 // fall-through
741 case 1:
742 // Frame 0 and 1 must be caller sensitive.
743 if (!m->caller_sensitive()) {
744 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
745 }
746 break;
747 default:
748 if (!m->is_ignored_by_security_stack_walk()) {
749 // We have reached the desired frame; return the holder class.
750 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
751 }
752 break;
753 }
754 }
755 return nullptr;
756 JVM_END
757
758
759 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
760 oop mirror = nullptr;
761 BasicType t = name2type(utf);
762 if (t != T_ILLEGAL && !is_reference_type(t)) {
763 mirror = Universe::java_mirror(t);
764 }
765 if (mirror == nullptr) {
766 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
767 } else {
768 return (jclass) JNIHandles::make_local(THREAD, mirror);
769 }
770 JVM_END
771
772
773 // Returns a class loaded by the bootstrap class loader; or null
774 // if not found. ClassNotFoundException is not thrown.
775 // FindClassFromBootLoader is exported to the launcher for windows.
776 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
777 const char* name))
778 // Java libraries should ensure that name is never null or illegal.
779 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
780 // It's impossible to create this class; the name cannot fit
781 // into the constant pool.
782 return nullptr;
783 }
784 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
785
786 TempNewSymbol h_name = SymbolTable::new_symbol(name);
787 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
788 if (k == nullptr) {
789 return nullptr;
790 }
791
792 if (log_is_enabled(Debug, class, resolve)) {
793 trace_class_resolution(k);
794 }
795 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
796 JVM_END
797
798 // Find a class with this name in this loader, using the caller's protection domain.
799 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
800 jboolean init, jobject loader,
801 jclass caller))
802 TempNewSymbol h_name =
803 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
804 CHECK_NULL);
805
806 oop loader_oop = JNIHandles::resolve(loader);
807 oop from_class = JNIHandles::resolve(caller);
808 oop protection_domain = nullptr;
809 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
810 // NPE. Put it in another way, the bootstrap class loader has all permission and
811 // thus no checkPackageAccess equivalence in the VM class loader.
812 // The caller is also passed as null by the java code if there is no security
813 // manager to avoid the performance cost of getting the calling class.
814 if (from_class != nullptr && loader_oop != nullptr) {
815 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
816 }
817
818 Handle h_loader(THREAD, loader_oop);
819 Handle h_prot(THREAD, protection_domain);
820 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
821 h_prot, false, THREAD);
822
823 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
824 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
825 }
826 return result;
827 JVM_END
828
829 // Currently only called from the old verifier.
830 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
831 jboolean init, jclass from))
832 TempNewSymbol h_name =
833 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
834 CHECK_NULL);
835 oop from_class_oop = JNIHandles::resolve(from);
836 Klass* from_class = (from_class_oop == nullptr)
837 ? (Klass*)nullptr
838 : java_lang_Class::as_Klass(from_class_oop);
839 oop class_loader = nullptr;
840 oop protection_domain = nullptr;
841 if (from_class != nullptr) {
842 class_loader = from_class->class_loader();
843 protection_domain = from_class->protection_domain();
844 }
845 Handle h_loader(THREAD, class_loader);
846 Handle h_prot (THREAD, protection_domain);
847 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
848 h_prot, true, thread);
849
850 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
851 // this function is generally only used for class loading during verification.
852 ResourceMark rm;
853 oop from_mirror = JNIHandles::resolve_non_null(from);
854 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
855 const char * from_name = from_class->external_name();
856
857 oop mirror = JNIHandles::resolve_non_null(result);
858 Klass* to_class = java_lang_Class::as_Klass(mirror);
859 const char * to = to_class->external_name();
860 log_debug(class, resolve)("%s %s (verification)", from_name, to);
861 }
862
863 return result;
864 JVM_END
865
866 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
867 static jclass jvm_define_class_common(const char *name,
868 jobject loader, const jbyte *buf,
869 jsize len, jobject pd, const char *source,
870 TRAPS) {
871 if (source == nullptr) source = "__JVM_DefineClass__";
872
873 JavaThread* jt = THREAD;
874
875 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
876 ClassLoader::perf_define_appclass_selftime(),
877 ClassLoader::perf_define_appclasses(),
878 jt->get_thread_stat()->perf_recursion_counts_addr(),
879 jt->get_thread_stat()->perf_timers_addr(),
880 PerfClassTraceTime::DEFINE_CLASS);
881
882 if (UsePerfData) {
883 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
884 }
885
886 // Class resolution will get the class name from the .class stream if the name is null.
887 TempNewSymbol class_name = name == nullptr ? nullptr :
888 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
889 CHECK_NULL);
890
891 ResourceMark rm(THREAD);
892 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
893 Handle class_loader (THREAD, JNIHandles::resolve(loader));
894 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
895 ClassLoadInfo cl_info(protection_domain);
896 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
897 class_loader,
898 cl_info,
899 CHECK_NULL);
900
901 if (log_is_enabled(Debug, class, resolve)) {
902 trace_class_resolution(k);
903 }
904
905 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
906 }
907
908 enum {
909 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
910 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
911 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
912 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
913 };
914
915 /*
916 * Define a class with the specified flags that indicates if it's a nestmate,
917 * hidden, or strongly referenced from class loader.
918 */
919 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
920 const jbyte *buf, jsize len, jobject pd,
921 jboolean init, int flags, jobject classData, TRAPS) {
922 ResourceMark rm(THREAD);
923
924 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
925 // Lookup class must be a non-null instance
926 if (lookup_k == nullptr) {
927 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
928 }
929 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
930
931 Handle class_loader (THREAD, lookup_k->class_loader());
932
933 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
934 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
935 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
936 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
937
938 InstanceKlass* host_class = nullptr;
939 if (is_nestmate) {
940 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
941 }
942
943 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
944 name,
945 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
946 is_nestmate ? host_class->external_name() : "",
947 is_hidden ? "hidden" : "not hidden",
948 is_strong ? "strong" : "weak",
949 vm_annotations ? "with vm annotations" : "without vm annotation");
950
951 if (!is_hidden) {
952 // classData is only applicable for hidden classes
953 if (classData != nullptr) {
954 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
955 }
956 if (is_nestmate) {
957 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
958 }
959 if (!is_strong) {
960 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
961 }
962 if (vm_annotations) {
963 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
964 }
965 if (flags != STRONG_LOADER_LINK) {
966 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
967 err_msg("invalid flag 0x%x", flags));
968 }
969 }
970
971 // Class resolution will get the class name from the .class stream if the name is null.
972 TempNewSymbol class_name = name == nullptr ? nullptr :
973 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
974 CHECK_NULL);
975
976 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
977 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
978 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
979
980 InstanceKlass* ik = nullptr;
981 if (!is_hidden) {
982 ClassLoadInfo cl_info(protection_domain);
983 ik = SystemDictionary::resolve_from_stream(&st, class_name,
984 class_loader,
985 cl_info,
986 CHECK_NULL);
987
988 if (log_is_enabled(Debug, class, resolve)) {
989 trace_class_resolution(ik);
990 }
991 } else { // hidden
992 Handle classData_h(THREAD, JNIHandles::resolve(classData));
993 ClassLoadInfo cl_info(protection_domain,
994 host_class,
995 classData_h,
996 is_hidden,
997 is_strong,
998 vm_annotations);
999 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1000 class_loader,
1001 cl_info,
1002 CHECK_NULL);
1003
1004 // The hidden class loader data has been artificially been kept alive to
1005 // this point. The mirror and any instances of this class have to keep
1006 // it alive afterwards.
1007 ik->class_loader_data()->dec_keep_alive();
1008
1009 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1010 ModuleEntry* module = ik->module();
1011 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1012 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1013 module_name,
1014 ik->external_name(),
1015 host_class->external_name(),
1016 ik->is_hidden() ? "is hidden" : "is not hidden");
1017 }
1018 }
1019 assert(Reflection::is_same_class_package(lookup_k, ik),
1020 "lookup class and defined class are in different packages");
1021
1022 if (init) {
1023 ik->initialize(CHECK_NULL);
1024 } else {
1025 ik->link_class(CHECK_NULL);
1026 }
1027
1028 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1029 }
1030
1031 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1032 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1033 JVM_END
1034
1035 /*
1036 * Define a class with the specified lookup class.
1037 * lookup: Lookup class
1038 * name: the name of the class
1039 * buf: class bytes
1040 * len: length of class bytes
1041 * pd: protection domain
1042 * init: initialize the class
1043 * flags: properties of the class
1044 * classData: private static pre-initialized field
1045 */
1046 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1047 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1048
1049 if (lookup == nullptr) {
1050 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1051 }
1052
1053 assert(buf != nullptr, "buf must not be null");
1054
1055 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1056 JVM_END
1057
1058 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1059
1060 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1061 JVM_END
1062
1063 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1064 ResourceMark rm(THREAD);
1065
1066 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1067 char* str = java_lang_String::as_utf8_string(h_name());
1068
1069 // Sanity check, don't expect null
1070 if (str == nullptr) return nullptr;
1071
1072 // Internalize the string, converting '.' to '/' in string.
1073 char* p = (char*)str;
1074 while (*p != '\0') {
1075 if (*p == '.') {
1076 *p = '/';
1077 }
1078 p++;
1079 }
1080
1081 const int str_len = (int)(p - str);
1082 if (str_len > Symbol::max_length()) {
1083 // It's impossible to create this class; the name cannot fit
1084 // into the constant pool.
1085 return nullptr;
1086 }
1087 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1088
1089 // Security Note:
1090 // The Java level wrapper will perform the necessary security check allowing
1091 // us to pass the null as the initiating class loader.
1092 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1093 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1094 h_loader,
1095 Handle());
1096 #if INCLUDE_CDS
1097 if (k == nullptr) {
1098 // If the class is not already loaded, try to see if it's in the shared
1099 // archive for the current classloader (h_loader).
1100 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1101 }
1102 #endif
1103 return (k == nullptr) ? nullptr :
1104 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1105 JVM_END
1106
1107 // Module support //////////////////////////////////////////////////////////////////////////////
1108
1109 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1110 jstring location, jobjectArray packages))
1111 Handle h_module (THREAD, JNIHandles::resolve(module));
1112 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1113 JVM_END
1114
1115 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1116 Handle h_module (THREAD, JNIHandles::resolve(module));
1117 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1118 JVM_END
1119
1120 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1121 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1122 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1123 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1124 JVM_END
1125
1126 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1127 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1128 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1129 JVM_END
1130
1131 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1132 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1133 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1134 JVM_END
1135
1136 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1137 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1138 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1139 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1140 JVM_END
1141
1142 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1143 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1144 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1145 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1146 JVM_END
1147
1148 // Reflection support //////////////////////////////////////////////////////////////////////////////
1149
1150 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1151 assert (cls != nullptr, "illegal class");
1152 JvmtiVMObjectAllocEventCollector oam;
1153 ResourceMark rm(THREAD);
1154 HandleMark hm(THREAD);
1155 Handle java_class(THREAD, JNIHandles::resolve(cls));
1156 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1157 return (jstring) JNIHandles::make_local(THREAD, result);
1158 JVM_END
1159
1160
1161 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1162 JvmtiVMObjectAllocEventCollector oam;
1163 oop mirror = JNIHandles::resolve_non_null(cls);
1164
1165 // Special handling for primitive objects
1166 if (java_lang_Class::is_primitive(mirror)) {
1167 // Primitive objects does not have any interfaces
1168 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1169 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1170 }
1171
1172 Klass* klass = java_lang_Class::as_Klass(mirror);
1173 // Figure size of result array
1174 int size;
1175 if (klass->is_instance_klass()) {
1176 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1177 } else {
1178 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1179 size = 2;
1180 }
1181
1182 // Allocate result array
1183 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1184 objArrayHandle result (THREAD, r);
1185 // Fill in result
1186 if (klass->is_instance_klass()) {
1187 // Regular instance klass, fill in all local interfaces
1188 for (int index = 0; index < size; index++) {
1189 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1190 result->obj_at_put(index, k->java_mirror());
1191 }
1192 } else {
1193 // All arrays implement java.lang.Cloneable and java.io.Serializable
1194 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1195 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1196 }
1197 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1198 JVM_END
1199
1200
1201 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1202 oop mirror = JNIHandles::resolve_non_null(cls);
1203 if (java_lang_Class::is_primitive(mirror)) {
1204 return JNI_FALSE;
1205 }
1206 Klass* k = java_lang_Class::as_Klass(mirror);
1207 jboolean result = k->is_interface();
1208 assert(!result || k->is_instance_klass(),
1209 "all interfaces are instance types");
1210 // The compiler intrinsic for isInterface tests the
1211 // Klass::_access_flags bits in the same way.
1212 return result;
1213 JVM_END
1214
1215 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1216 oop mirror = JNIHandles::resolve_non_null(cls);
1217 if (java_lang_Class::is_primitive(mirror)) {
1218 return JNI_FALSE;
1219 }
1220 Klass* k = java_lang_Class::as_Klass(mirror);
1221 return k->is_hidden();
1222 JVM_END
1223
1224 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1225 JvmtiVMObjectAllocEventCollector oam;
1226 oop mirror = JNIHandles::resolve_non_null(cls);
1227 if (java_lang_Class::is_primitive(mirror)) {
1228 // There are no signers for primitive types
1229 return nullptr;
1230 }
1231
1232 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1233
1234 // If there are no signers set in the class, or if the class
1235 // is an array, return null.
1236 if (signers == nullptr) return nullptr;
1237
1238 // copy of the signers array
1239 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1240 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1241 for (int index = 0; index < signers->length(); index++) {
1242 signers_copy->obj_at_put(index, signers->obj_at(index));
1243 }
1244
1245 // return the copy
1246 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1247 JVM_END
1248
1249
1250 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1251 oop mirror = JNIHandles::resolve_non_null(cls);
1252 if (!java_lang_Class::is_primitive(mirror)) {
1253 // This call is ignored for primitive types and arrays.
1254 // Signers are only set once, ClassLoader.java, and thus shouldn't
1255 // be called with an array. Only the bootstrap loader creates arrays.
1256 Klass* k = java_lang_Class::as_Klass(mirror);
1257 if (k->is_instance_klass()) {
1258 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1259 }
1260 }
1261 JVM_END
1262
1263
1264 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1265 oop mirror = JNIHandles::resolve_non_null(cls);
1266 if (mirror == nullptr) {
1267 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1268 }
1269
1270 if (java_lang_Class::is_primitive(mirror)) {
1271 // Primitive types does not have a protection domain.
1272 return nullptr;
1273 }
1274
1275 oop pd = java_lang_Class::protection_domain(mirror);
1276 return (jobject) JNIHandles::make_local(THREAD, pd);
1277 JVM_END
1278
1279
1280 // Returns the inherited_access_control_context field of the running thread.
1281 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1282 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1283 return JNIHandles::make_local(THREAD, result);
1284 JVM_END
1285
1286 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1287 if (!UsePrivilegedStack) return nullptr;
1288
1289 ResourceMark rm(THREAD);
1290 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1291 JvmtiVMObjectAllocEventCollector oam;
1292
1293 // count the protection domains on the execution stack. We collapse
1294 // duplicate consecutive protection domains into a single one, as
1295 // well as stopping when we hit a privileged frame.
1296
1297 oop previous_protection_domain = nullptr;
1298 Handle privileged_context(thread, nullptr);
1299 bool is_privileged = false;
1300 oop protection_domain = nullptr;
1301
1302 // Iterate through Java frames
1303 vframeStream vfst(thread);
1304 for(; !vfst.at_end(); vfst.next()) {
1305 // get method of frame
1306 Method* method = vfst.method();
1307
1308 // stop at the first privileged frame
1309 if (method->method_holder() == vmClasses::AccessController_klass() &&
1310 method->name() == vmSymbols::executePrivileged_name())
1311 {
1312 // this frame is privileged
1313 is_privileged = true;
1314
1315 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1316
1317 StackValueCollection* locals = priv->locals();
1318 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1319 StackValue* clr_sv = locals->at(2); // Class<?> caller
1320 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1321 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1322 privileged_context = ctx_sv->get_obj();
1323 Handle caller = clr_sv->get_obj();
1324
1325 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1326 protection_domain = caller_klass->protection_domain();
1327 } else {
1328 protection_domain = method->method_holder()->protection_domain();
1329 }
1330
1331 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1332 local_array->push(Handle(thread, protection_domain));
1333 previous_protection_domain = protection_domain;
1334 }
1335
1336 if (is_privileged) break;
1337 }
1338
1339
1340 // either all the domains on the stack were system domains, or
1341 // we had a privileged system domain
1342 if (local_array->is_empty()) {
1343 if (is_privileged && privileged_context.is_null()) return nullptr;
1344
1345 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1346 return JNIHandles::make_local(THREAD, result);
1347 }
1348
1349 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1350 local_array->length(), CHECK_NULL);
1351 objArrayHandle h_context(thread, context);
1352 for (int index = 0; index < local_array->length(); index++) {
1353 h_context->obj_at_put(index, local_array->at(index)());
1354 }
1355
1356 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1357
1358 return JNIHandles::make_local(THREAD, result);
1359 JVM_END
1360
1361 class ScopedValueBindingsResolver {
1362 public:
1363 InstanceKlass* Carrier_klass;
1364 ScopedValueBindingsResolver(JavaThread* THREAD) {
1365 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1366 Carrier_klass = InstanceKlass::cast(k);
1367 }
1368 };
1369
1370 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1371 ResourceMark rm(THREAD);
1372 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1373 JvmtiVMObjectAllocEventCollector oam;
1374
1375 static ScopedValueBindingsResolver resolver(THREAD);
1376
1377 // Iterate through Java frames
1378 vframeStream vfst(thread);
1379 for(; !vfst.at_end(); vfst.next()) {
1380 int loc = -1;
1381 // get method of frame
1382 Method* method = vfst.method();
1383
1384 Symbol *name = method->name();
1385
1386 InstanceKlass* holder = method->method_holder();
1387 if (name == vmSymbols::runWith_method_name()) {
1388 if ((holder == resolver.Carrier_klass
1389 || holder == vmClasses::VirtualThread_klass()
1390 || holder == vmClasses::Thread_klass())) {
1391 loc = 1;
1392 }
1393 }
1394
1395 if (loc != -1) {
1396 javaVFrame *frame = vfst.asJavaVFrame();
1397 StackValueCollection* locals = frame->locals();
1398 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1399 Handle result = head_sv->get_obj();
1400 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1401 if (result() != nullptr) {
1402 return JNIHandles::make_local(THREAD, result());
1403 }
1404 }
1405 }
1406
1407 return nullptr;
1408 JVM_END
1409
1410 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1411 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1412 return (k != nullptr) && k->is_array_klass() ? true : false;
1413 JVM_END
1414
1415
1416 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1417 oop mirror = JNIHandles::resolve_non_null(cls);
1418 return (jboolean) java_lang_Class::is_primitive(mirror);
1419 JVM_END
1420
1421
1422 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1423 oop mirror = JNIHandles::resolve_non_null(cls);
1424 if (java_lang_Class::is_primitive(mirror)) {
1425 // Primitive type
1426 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1427 }
1428
1429 Klass* k = java_lang_Class::as_Klass(mirror);
1430 debug_only(int computed_modifiers = k->compute_modifier_flags());
1431 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1432 return k->modifier_flags();
1433 JVM_END
1434
1435
1436 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1437
1438 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1439 JvmtiVMObjectAllocEventCollector oam;
1440 // ofClass is a reference to a java_lang_Class object. The mirror object
1441 // of an InstanceKlass
1442 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1443 if (java_lang_Class::is_primitive(ofMirror) ||
1444 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1445 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1446 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1447 }
1448
1449 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1450 InnerClassesIterator iter(k);
1451
1452 if (iter.length() == 0) {
1453 // Neither an inner nor outer class
1454 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1455 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1456 }
1457
1458 // find inner class info
1459 constantPoolHandle cp(thread, k->constants());
1460 int length = iter.length();
1461
1462 // Allocate temp. result array
1463 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1464 objArrayHandle result (THREAD, r);
1465 int members = 0;
1466
1467 for (; !iter.done(); iter.next()) {
1468 int ioff = iter.inner_class_info_index();
1469 int ooff = iter.outer_class_info_index();
1470
1471 if (ioff != 0 && ooff != 0) {
1472 // Check to see if the name matches the class we're looking for
1473 // before attempting to find the class.
1474 if (cp->klass_name_at_matches(k, ooff)) {
1475 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1476 if (outer_klass == k) {
1477 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1478 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1479
1480 // Throws an exception if outer klass has not declared k as
1481 // an inner klass
1482 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1483
1484 result->obj_at_put(members, inner_klass->java_mirror());
1485 members++;
1486 }
1487 }
1488 }
1489 }
1490
1491 if (members != length) {
1492 // Return array of right length
1493 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1494 for(int i = 0; i < members; i++) {
1495 res->obj_at_put(i, result->obj_at(i));
1496 }
1497 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1498 }
1499
1500 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1501 JVM_END
1502
1503
1504 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1505 {
1506 // ofClass is a reference to a java_lang_Class object.
1507 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1508 if (java_lang_Class::is_primitive(ofMirror)) {
1509 return nullptr;
1510 }
1511 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1512 if (!klass->is_instance_klass()) {
1513 return nullptr;
1514 }
1515
1516 bool inner_is_member = false;
1517 Klass* outer_klass
1518 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1519 if (outer_klass == nullptr) return nullptr; // already a top-level class
1520 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1521 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1522 }
1523 JVM_END
1524
1525 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1526 {
1527 oop mirror = JNIHandles::resolve_non_null(cls);
1528 if (java_lang_Class::is_primitive(mirror)) {
1529 return nullptr;
1530 }
1531 Klass* klass = java_lang_Class::as_Klass(mirror);
1532 if (!klass->is_instance_klass()) {
1533 return nullptr;
1534 }
1535 InstanceKlass* k = InstanceKlass::cast(klass);
1536 int ooff = 0, noff = 0;
1537 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1538 if (noff != 0) {
1539 constantPoolHandle i_cp(thread, k->constants());
1540 Symbol* name = i_cp->symbol_at(noff);
1541 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1542 return (jstring) JNIHandles::make_local(THREAD, str());
1543 }
1544 }
1545 return nullptr;
1546 }
1547 JVM_END
1548
1549 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1550 assert (cls != nullptr, "illegal class");
1551 JvmtiVMObjectAllocEventCollector oam;
1552 ResourceMark rm(THREAD);
1553 oop mirror = JNIHandles::resolve_non_null(cls);
1554 // Return null for arrays and primitives
1555 if (!java_lang_Class::is_primitive(mirror)) {
1556 Klass* k = java_lang_Class::as_Klass(mirror);
1557 if (k->is_instance_klass()) {
1558 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1559 if (sym == nullptr) return nullptr;
1560 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1561 return (jstring) JNIHandles::make_local(THREAD, str());
1562 }
1563 }
1564 return nullptr;
1565 JVM_END
1566
1567
1568 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1569 assert (cls != nullptr, "illegal class");
1570 oop mirror = JNIHandles::resolve_non_null(cls);
1571 // Return null for arrays and primitives
1572 if (!java_lang_Class::is_primitive(mirror)) {
1573 Klass* k = java_lang_Class::as_Klass(mirror);
1574 if (k->is_instance_klass()) {
1575 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1576 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1577 }
1578 }
1579 return nullptr;
1580 JVM_END
1581
1582
1583 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1584 // some of this code was adapted from from jni_FromReflectedField
1585
1586 oop reflected = JNIHandles::resolve_non_null(field);
1587 oop mirror = java_lang_reflect_Field::clazz(reflected);
1588 Klass* k = java_lang_Class::as_Klass(mirror);
1589 int slot = java_lang_reflect_Field::slot(reflected);
1590 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1591
1592 InstanceKlass* ik = InstanceKlass::cast(k);
1593 intptr_t offset = ik->field_offset(slot);
1594
1595 if (modifiers & JVM_ACC_STATIC) {
1596 // for static fields we only look in the current class
1597 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1598 assert(false, "cannot find static field");
1599 return false;
1600 }
1601 } else {
1602 // for instance fields we start with the current class and work
1603 // our way up through the superclass chain
1604 if (!ik->find_field_from_offset(offset, false, &fd)) {
1605 assert(false, "cannot find instance field");
1606 return false;
1607 }
1608 }
1609 return true;
1610 }
1611
1612 static Method* jvm_get_method_common(jobject method) {
1613 // some of this code was adapted from from jni_FromReflectedMethod
1614
1615 oop reflected = JNIHandles::resolve_non_null(method);
1616 oop mirror = nullptr;
1617 int slot = 0;
1618
1619 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1620 mirror = java_lang_reflect_Constructor::clazz(reflected);
1621 slot = java_lang_reflect_Constructor::slot(reflected);
1622 } else {
1623 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1624 "wrong type");
1625 mirror = java_lang_reflect_Method::clazz(reflected);
1626 slot = java_lang_reflect_Method::slot(reflected);
1627 }
1628 Klass* k = java_lang_Class::as_Klass(mirror);
1629
1630 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1631 assert(m != nullptr, "cannot find method");
1632 return m; // caller has to deal with null in product mode
1633 }
1634
1635 /* Type use annotations support (JDK 1.8) */
1636
1637 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1638 assert (cls != nullptr, "illegal class");
1639 ResourceMark rm(THREAD);
1640 // Return null for arrays and primitives
1641 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1643 if (k->is_instance_klass()) {
1644 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1645 if (type_annotations != nullptr) {
1646 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1647 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1648 }
1649 }
1650 }
1651 return nullptr;
1652 JVM_END
1653
1654 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1655 assert (method != nullptr, "illegal method");
1656 // method is a handle to a java.lang.reflect.Method object
1657 Method* m = jvm_get_method_common(method);
1658 if (m == nullptr) {
1659 return nullptr;
1660 }
1661
1662 AnnotationArray* type_annotations = m->type_annotations();
1663 if (type_annotations != nullptr) {
1664 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1665 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1666 }
1667
1668 return nullptr;
1669 JVM_END
1670
1671 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1672 assert (field != nullptr, "illegal field");
1673 fieldDescriptor fd;
1674 bool gotFd = jvm_get_field_common(field, fd);
1675 if (!gotFd) {
1676 return nullptr;
1677 }
1678
1679 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1680 JVM_END
1681
1682 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1683 if (!cp->is_within_bounds(index)) {
1684 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1685 }
1686 }
1687
1688 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1689 {
1690 // method is a handle to a java.lang.reflect.Method object
1691 Method* method_ptr = jvm_get_method_common(method);
1692 methodHandle mh (THREAD, method_ptr);
1693 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1694 const int num_params = mh->method_parameters_length();
1695
1696 if (num_params < 0) {
1697 // A -1 return value from method_parameters_length means there is no
1698 // parameter data. Return null to indicate this to the reflection
1699 // API.
1700 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1701 return (jobjectArray)nullptr;
1702 } else {
1703 // Otherwise, we return something up to reflection, even if it is
1704 // a zero-length array. Why? Because in some cases this can
1705 // trigger a MalformedParametersException.
1706
1707 // make sure all the symbols are properly formatted
1708 for (int i = 0; i < num_params; i++) {
1709 MethodParametersElement* params = mh->method_parameters_start();
1710 int index = params[i].name_cp_index;
1711 constantPoolHandle cp(THREAD, mh->constants());
1712 bounds_check(cp, index, CHECK_NULL);
1713
1714 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1715 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1716 "Wrong type at constant pool index");
1717 }
1718
1719 }
1720
1721 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1722 objArrayHandle result (THREAD, result_oop);
1723
1724 for (int i = 0; i < num_params; i++) {
1725 MethodParametersElement* params = mh->method_parameters_start();
1726 // For a 0 index, give a null symbol
1727 Symbol* sym = 0 != params[i].name_cp_index ?
1728 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1729 int flags = params[i].flags;
1730 oop param = Reflection::new_parameter(reflected_method, i, sym,
1731 flags, CHECK_NULL);
1732 result->obj_at_put(i, param);
1733 }
1734 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1735 }
1736 }
1737 JVM_END
1738
1739 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1740
1741 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1742 {
1743 JvmtiVMObjectAllocEventCollector oam;
1744
1745 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1746 // Exclude primitive types and array types
1747 if (java_lang_Class::is_primitive(ofMirror) ||
1748 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1749 // Return empty array
1750 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1751 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1752 }
1753
1754 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1755 constantPoolHandle cp(THREAD, k->constants());
1756
1757 // Ensure class is linked
1758 k->link_class(CHECK_NULL);
1759
1760 // Allocate result
1761 int num_fields;
1762
1763 if (publicOnly) {
1764 num_fields = 0;
1765 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1766 if (fs.access_flags().is_public()) ++num_fields;
1767 }
1768 } else {
1769 num_fields = k->java_fields_count();
1770 }
1771
1772 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1773 objArrayHandle result (THREAD, r);
1774
1775 int out_idx = 0;
1776 fieldDescriptor fd;
1777 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1778 if (!publicOnly || fs.access_flags().is_public()) {
1779 fd.reinitialize(k, fs.index());
1780 oop field = Reflection::new_field(&fd, CHECK_NULL);
1781 result->obj_at_put(out_idx, field);
1782 ++out_idx;
1783 }
1784 }
1785 assert(out_idx == num_fields, "just checking");
1786 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1787 }
1788 JVM_END
1789
1790 // A class is a record if and only if it is final and a direct subclass of
1791 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1792 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1793 {
1794 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1795 if (k != nullptr && k->is_instance_klass()) {
1796 InstanceKlass* ik = InstanceKlass::cast(k);
1797 return ik->is_record();
1798 } else {
1799 return false;
1800 }
1801 }
1802 JVM_END
1803
1804 // Returns an array containing the components of the Record attribute,
1805 // or null if the attribute is not present.
1806 //
1807 // Note that this function returns the components of the Record attribute
1808 // even if the class is not a record.
1809 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1810 {
1811 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1812 assert(c->is_instance_klass(), "must be");
1813 InstanceKlass* ik = InstanceKlass::cast(c);
1814
1815 Array<RecordComponent*>* components = ik->record_components();
1816 if (components != nullptr) {
1817 JvmtiVMObjectAllocEventCollector oam;
1818 constantPoolHandle cp(THREAD, ik->constants());
1819 int length = components->length();
1820 assert(length >= 0, "unexpected record_components length");
1821 objArrayOop record_components =
1822 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1823 objArrayHandle components_h (THREAD, record_components);
1824
1825 for (int x = 0; x < length; x++) {
1826 RecordComponent* component = components->at(x);
1827 assert(component != nullptr, "unexpected null record component");
1828 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1829 components_h->obj_at_put(x, component_oop);
1830 }
1831 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1832 }
1833
1834 return nullptr;
1835 }
1836 JVM_END
1837
1838 static bool select_method(const methodHandle& method, bool want_constructor) {
1839 if (want_constructor) {
1840 return (method->is_initializer() && !method->is_static());
1841 } else {
1842 return (!method->is_initializer() && !method->is_overpass());
1843 }
1844 }
1845
1846 static jobjectArray get_class_declared_methods_helper(
1847 JNIEnv *env,
1848 jclass ofClass, jboolean publicOnly,
1849 bool want_constructor,
1850 Klass* klass, TRAPS) {
1851
1852 JvmtiVMObjectAllocEventCollector oam;
1853
1854 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1855 // Exclude primitive types and array types
1856 if (java_lang_Class::is_primitive(ofMirror)
1857 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1858 // Return empty array
1859 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1860 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1861 }
1862
1863 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1864
1865 // Ensure class is linked
1866 k->link_class(CHECK_NULL);
1867
1868 Array<Method*>* methods = k->methods();
1869 int methods_length = methods->length();
1870
1871 // Save original method_idnum in case of redefinition, which can change
1872 // the idnum of obsolete methods. The new method will have the same idnum
1873 // but if we refresh the methods array, the counts will be wrong.
1874 ResourceMark rm(THREAD);
1875 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1876 int num_methods = 0;
1877
1878 for (int i = 0; i < methods_length; i++) {
1879 methodHandle method(THREAD, methods->at(i));
1880 if (select_method(method, want_constructor)) {
1881 if (!publicOnly || method->is_public()) {
1882 idnums->push(method->method_idnum());
1883 ++num_methods;
1884 }
1885 }
1886 }
1887
1888 // Allocate result
1889 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1890 objArrayHandle result (THREAD, r);
1891
1892 // Now just put the methods that we selected above, but go by their idnum
1893 // in case of redefinition. The methods can be redefined at any safepoint,
1894 // so above when allocating the oop array and below when creating reflect
1895 // objects.
1896 for (int i = 0; i < num_methods; i++) {
1897 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1898 if (method.is_null()) {
1899 // Method may have been deleted and seems this API can handle null
1900 // Otherwise should probably put a method that throws NSME
1901 result->obj_at_put(i, nullptr);
1902 } else {
1903 oop m;
1904 if (want_constructor) {
1905 m = Reflection::new_constructor(method, CHECK_NULL);
1906 } else {
1907 m = Reflection::new_method(method, false, CHECK_NULL);
1908 }
1909 result->obj_at_put(i, m);
1910 }
1911 }
1912
1913 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1914 }
1915
1916 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1917 {
1918 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1919 /*want_constructor*/ false,
1920 vmClasses::reflect_Method_klass(), THREAD);
1921 }
1922 JVM_END
1923
1924 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1925 {
1926 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1927 /*want_constructor*/ true,
1928 vmClasses::reflect_Constructor_klass(), THREAD);
1929 }
1930 JVM_END
1931
1932 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1933 {
1934 oop mirror = JNIHandles::resolve_non_null(cls);
1935 if (java_lang_Class::is_primitive(mirror)) {
1936 // Primitive type
1937 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1938 }
1939
1940 Klass* k = java_lang_Class::as_Klass(mirror);
1941 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1942 }
1943 JVM_END
1944
1945 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1946 {
1947 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1948 assert(c->is_instance_klass(), "must be");
1949 InstanceKlass* ck = InstanceKlass::cast(c);
1950 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1951 assert(m->is_instance_klass(), "must be");
1952 InstanceKlass* mk = InstanceKlass::cast(m);
1953 return ck->has_nestmate_access_to(mk, THREAD);
1954 }
1955 JVM_END
1956
1957 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1958 {
1959 // current is not a primitive or array class
1960 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1961 assert(c->is_instance_klass(), "must be");
1962 InstanceKlass* ck = InstanceKlass::cast(c);
1963 InstanceKlass* host = ck->nest_host(THREAD);
1964 return (jclass) (host == nullptr ? nullptr :
1965 JNIHandles::make_local(THREAD, host->java_mirror()));
1966 }
1967 JVM_END
1968
1969 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1970 {
1971 // current is not a primitive or array class
1972 ResourceMark rm(THREAD);
1973 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1974 assert(c->is_instance_klass(), "must be");
1975 InstanceKlass* ck = InstanceKlass::cast(c);
1976 InstanceKlass* host = ck->nest_host(THREAD);
1977
1978 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1979 ck->external_name(), host->external_name());
1980 {
1981 JvmtiVMObjectAllocEventCollector oam;
1982 Array<u2>* members = host->nest_members();
1983 int length = members == nullptr ? 0 : members->length();
1984
1985 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1986
1987 // nest host is first in the array so make it one bigger
1988 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1989 length + 1, CHECK_NULL);
1990 objArrayHandle result(THREAD, r);
1991 result->obj_at_put(0, host->java_mirror());
1992 if (length != 0) {
1993 int count = 0;
1994 for (int i = 0; i < length; i++) {
1995 int cp_index = members->at(i);
1996 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1997 if (HAS_PENDING_EXCEPTION) {
1998 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1999 return nullptr; // propagate VMEs
2000 }
2001 if (log_is_enabled(Trace, class, nestmates)) {
2002 stringStream ss;
2003 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2004 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2005 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2006 log_trace(class, nestmates)("%s", ss.as_string());
2007 }
2008 CLEAR_PENDING_EXCEPTION;
2009 continue;
2010 }
2011 if (k->is_instance_klass()) {
2012 InstanceKlass* ik = InstanceKlass::cast(k);
2013 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2014 if (nest_host_k == host) {
2015 result->obj_at_put(count+1, k->java_mirror());
2016 count++;
2017 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2018 } else {
2019 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2020 ik->external_name(), nest_host_k->external_name());
2021 }
2022 } else {
2023 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2024 k->external_name());
2025 }
2026 }
2027 if (count < length) {
2028 // we had invalid entries so we need to compact the array
2029 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2030 length + 1, count + 1);
2031
2032 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2033 count + 1, CHECK_NULL);
2034 objArrayHandle result2(THREAD, r2);
2035 for (int i = 0; i < count + 1; i++) {
2036 result2->obj_at_put(i, result->obj_at(i));
2037 }
2038 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2039 }
2040 }
2041 else {
2042 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2043 }
2044 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2045 }
2046 }
2047 JVM_END
2048
2049 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2050 {
2051 oop mirror = JNIHandles::resolve_non_null(current);
2052 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2053 Klass* c = java_lang_Class::as_Klass(mirror);
2054 assert(c->is_instance_klass(), "must be");
2055 InstanceKlass* ik = InstanceKlass::cast(c);
2056 ResourceMark rm(THREAD);
2057 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2058 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2059 if (ik->is_sealed()) {
2060 JvmtiVMObjectAllocEventCollector oam;
2061 Array<u2>* subclasses = ik->permitted_subclasses();
2062 int length = subclasses->length();
2063
2064 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2065
2066 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2067 length, CHECK_NULL);
2068 objArrayHandle result(THREAD, r);
2069 int count = 0;
2070 for (int i = 0; i < length; i++) {
2071 int cp_index = subclasses->at(i);
2072 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2073 if (HAS_PENDING_EXCEPTION) {
2074 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2075 return nullptr; // propagate VMEs
2076 }
2077 if (log_is_enabled(Trace, class, sealed)) {
2078 stringStream ss;
2079 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2080 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2081 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2082 log_trace(class, sealed)("%s", ss.as_string());
2083 }
2084
2085 CLEAR_PENDING_EXCEPTION;
2086 continue;
2087 }
2088 if (k->is_instance_klass()) {
2089 result->obj_at_put(count++, k->java_mirror());
2090 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2091 }
2092 }
2093 if (count < length) {
2094 // we had invalid entries so we need to compact the array
2095 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2096 count, CHECK_NULL);
2097 objArrayHandle result2(THREAD, r2);
2098 for (int i = 0; i < count; i++) {
2099 result2->obj_at_put(i, result->obj_at(i));
2100 }
2101 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2102 }
2103 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2104 } else {
2105 return nullptr;
2106 }
2107 }
2108 JVM_END
2109
2110 // Constant pool access //////////////////////////////////////////////////////////
2111
2112 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2113 {
2114 JvmtiVMObjectAllocEventCollector oam;
2115 oop mirror = JNIHandles::resolve_non_null(cls);
2116 // Return null for primitives and arrays
2117 if (!java_lang_Class::is_primitive(mirror)) {
2118 Klass* k = java_lang_Class::as_Klass(mirror);
2119 if (k->is_instance_klass()) {
2120 InstanceKlass* k_h = InstanceKlass::cast(k);
2121 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2122 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2123 return JNIHandles::make_local(THREAD, jcp());
2124 }
2125 }
2126 return nullptr;
2127 }
2128 JVM_END
2129
2130
2131 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2132 {
2133 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2134 return cp->length();
2135 }
2136 JVM_END
2137
2138
2139 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2140 {
2141 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2142 bounds_check(cp, index, CHECK_NULL);
2143 constantTag tag = cp->tag_at(index);
2144 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2145 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2146 }
2147 Klass* k = cp->klass_at(index, CHECK_NULL);
2148 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2149 }
2150 JVM_END
2151
2152 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2153 {
2154 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2155 bounds_check(cp, index, CHECK_NULL);
2156 constantTag tag = cp->tag_at(index);
2157 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2158 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2159 }
2160 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2161 if (k == nullptr) return nullptr;
2162 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2163 }
2164 JVM_END
2165
2166 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2167 constantTag tag = cp->tag_at(index);
2168 if (!tag.is_method() && !tag.is_interface_method()) {
2169 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2170 }
2171 int klass_ref = cp->uncached_klass_ref_index_at(index);
2172 Klass* k_o;
2173 if (force_resolution) {
2174 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2175 } else {
2176 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2177 if (k_o == nullptr) return nullptr;
2178 }
2179 InstanceKlass* k = InstanceKlass::cast(k_o);
2180 Symbol* name = cp->uncached_name_ref_at(index);
2181 Symbol* sig = cp->uncached_signature_ref_at(index);
2182 methodHandle m (THREAD, k->find_method(name, sig));
2183 if (m.is_null()) {
2184 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2185 }
2186 oop method;
2187 if (!m->is_initializer() || m->is_static()) {
2188 method = Reflection::new_method(m, true, CHECK_NULL);
2189 } else {
2190 method = Reflection::new_constructor(m, CHECK_NULL);
2191 }
2192 return JNIHandles::make_local(THREAD, method);
2193 }
2194
2195 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2196 {
2197 JvmtiVMObjectAllocEventCollector oam;
2198 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2199 bounds_check(cp, index, CHECK_NULL);
2200 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2201 return res;
2202 }
2203 JVM_END
2204
2205 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2206 {
2207 JvmtiVMObjectAllocEventCollector oam;
2208 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2209 bounds_check(cp, index, CHECK_NULL);
2210 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2211 return res;
2212 }
2213 JVM_END
2214
2215 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2216 constantTag tag = cp->tag_at(index);
2217 if (!tag.is_field()) {
2218 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2219 }
2220 int klass_ref = cp->uncached_klass_ref_index_at(index);
2221 Klass* k_o;
2222 if (force_resolution) {
2223 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2224 } else {
2225 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2226 if (k_o == nullptr) return nullptr;
2227 }
2228 InstanceKlass* k = InstanceKlass::cast(k_o);
2229 Symbol* name = cp->uncached_name_ref_at(index);
2230 Symbol* sig = cp->uncached_signature_ref_at(index);
2231 fieldDescriptor fd;
2232 Klass* target_klass = k->find_field(name, sig, &fd);
2233 if (target_klass == nullptr) {
2234 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2235 }
2236 oop field = Reflection::new_field(&fd, CHECK_NULL);
2237 return JNIHandles::make_local(THREAD, field);
2238 }
2239
2240 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2241 {
2242 JvmtiVMObjectAllocEventCollector oam;
2243 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2244 bounds_check(cp, index, CHECK_NULL);
2245 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2246 return res;
2247 }
2248 JVM_END
2249
2250 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2251 {
2252 JvmtiVMObjectAllocEventCollector oam;
2253 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2254 bounds_check(cp, index, CHECK_NULL);
2255 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2256 return res;
2257 }
2258 JVM_END
2259
2260 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2261 {
2262 JvmtiVMObjectAllocEventCollector oam;
2263 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2264 bounds_check(cp, index, CHECK_NULL);
2265 constantTag tag = cp->tag_at(index);
2266 if (!tag.is_field_or_method()) {
2267 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2268 }
2269 int klass_ref = cp->uncached_klass_ref_index_at(index);
2270 Symbol* klass_name = cp->klass_name_at(klass_ref);
2271 Symbol* member_name = cp->uncached_name_ref_at(index);
2272 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2273 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2274 objArrayHandle dest(THREAD, dest_o);
2275 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2276 dest->obj_at_put(0, str());
2277 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2278 dest->obj_at_put(1, str());
2279 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2280 dest->obj_at_put(2, str());
2281 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2282 }
2283 JVM_END
2284
2285 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2286 {
2287 JvmtiVMObjectAllocEventCollector oam;
2288 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2289 bounds_check(cp, index, CHECK_0);
2290 constantTag tag = cp->tag_at(index);
2291 if (!tag.is_field_or_method()) {
2292 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2293 }
2294 return (jint) cp->uncached_klass_ref_index_at(index);
2295 }
2296 JVM_END
2297
2298 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2299 {
2300 JvmtiVMObjectAllocEventCollector oam;
2301 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2302 bounds_check(cp, index, CHECK_0);
2303 constantTag tag = cp->tag_at(index);
2304 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2305 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2306 }
2307 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2308 }
2309 JVM_END
2310
2311 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2312 {
2313 JvmtiVMObjectAllocEventCollector oam;
2314 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2315 bounds_check(cp, index, CHECK_NULL);
2316 constantTag tag = cp->tag_at(index);
2317 if (!tag.is_name_and_type()) {
2318 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2319 }
2320 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2321 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2322 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2323 objArrayHandle dest(THREAD, dest_o);
2324 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2325 dest->obj_at_put(0, str());
2326 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2327 dest->obj_at_put(1, str());
2328 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2329 }
2330 JVM_END
2331
2332 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2333 {
2334 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2335 bounds_check(cp, index, CHECK_0);
2336 constantTag tag = cp->tag_at(index);
2337 if (!tag.is_int()) {
2338 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2339 }
2340 return cp->int_at(index);
2341 }
2342 JVM_END
2343
2344 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2345 {
2346 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2347 bounds_check(cp, index, CHECK_(0L));
2348 constantTag tag = cp->tag_at(index);
2349 if (!tag.is_long()) {
2350 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2351 }
2352 return cp->long_at(index);
2353 }
2354 JVM_END
2355
2356 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2357 {
2358 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2359 bounds_check(cp, index, CHECK_(0.0f));
2360 constantTag tag = cp->tag_at(index);
2361 if (!tag.is_float()) {
2362 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2363 }
2364 return cp->float_at(index);
2365 }
2366 JVM_END
2367
2368 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2369 {
2370 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2371 bounds_check(cp, index, CHECK_(0.0));
2372 constantTag tag = cp->tag_at(index);
2373 if (!tag.is_double()) {
2374 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2375 }
2376 return cp->double_at(index);
2377 }
2378 JVM_END
2379
2380 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2381 {
2382 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2383 bounds_check(cp, index, CHECK_NULL);
2384 constantTag tag = cp->tag_at(index);
2385 if (!tag.is_string()) {
2386 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2387 }
2388 oop str = cp->string_at(index, CHECK_NULL);
2389 return (jstring) JNIHandles::make_local(THREAD, str);
2390 }
2391 JVM_END
2392
2393 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2394 {
2395 JvmtiVMObjectAllocEventCollector oam;
2396 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2397 bounds_check(cp, index, CHECK_NULL);
2398 constantTag tag = cp->tag_at(index);
2399 if (!tag.is_symbol()) {
2400 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2401 }
2402 Symbol* sym = cp->symbol_at(index);
2403 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2404 return (jstring) JNIHandles::make_local(THREAD, str());
2405 }
2406 JVM_END
2407
2408 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2409 {
2410 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2411 bounds_check(cp, index, CHECK_0);
2412 constantTag tag = cp->tag_at(index);
2413 jbyte result = tag.value();
2414 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2415 // they are changed to the corresponding tags from the JVM spec, so that java code in
2416 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2417 if (tag.is_klass_or_reference()) {
2418 result = JVM_CONSTANT_Class;
2419 } else if (tag.is_string_index()) {
2420 result = JVM_CONSTANT_String;
2421 } else if (tag.is_method_type_in_error()) {
2422 result = JVM_CONSTANT_MethodType;
2423 } else if (tag.is_method_handle_in_error()) {
2424 result = JVM_CONSTANT_MethodHandle;
2425 } else if (tag.is_dynamic_constant_in_error()) {
2426 result = JVM_CONSTANT_Dynamic;
2427 }
2428 return result;
2429 }
2430 JVM_END
2431
2432 // Assertion support. //////////////////////////////////////////////////////////
2433
2434 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2435 assert(cls != nullptr, "bad class");
2436
2437 oop r = JNIHandles::resolve(cls);
2438 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2439 if (java_lang_Class::is_primitive(r)) return false;
2440
2441 Klass* k = java_lang_Class::as_Klass(r);
2442 assert(k->is_instance_klass(), "must be an instance klass");
2443 if (!k->is_instance_klass()) return false;
2444
2445 ResourceMark rm(THREAD);
2446 const char* name = k->name()->as_C_string();
2447 bool system_class = k->class_loader() == nullptr;
2448 return JavaAssertions::enabled(name, system_class);
2449
2450 JVM_END
2451
2452
2453 // Return a new AssertionStatusDirectives object with the fields filled in with
2454 // command-line assertion arguments (i.e., -ea, -da).
2455 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2456 JvmtiVMObjectAllocEventCollector oam;
2457 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2458 return JNIHandles::make_local(THREAD, asd);
2459 JVM_END
2460
2461 // Verification ////////////////////////////////////////////////////////////////////////////////
2462
2463 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2464
2465 // RedefineClasses support: bug 6214132 caused verification to fail.
2466 // All functions from this section should call the jvmtiThreadSate function:
2467 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2468 // The function returns a Klass* of the _scratch_class if the verifier
2469 // was invoked in the middle of the class redefinition.
2470 // Otherwise it returns its argument value which is the _the_class Klass*.
2471 // Please, refer to the description in the jvmtiThreadSate.hpp.
2472
2473 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2474 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2475 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2476 return k->name()->as_utf8();
2477 JVM_END
2478
2479
2480 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2481 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2482 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2483 // types will have length zero if this is not an InstanceKlass
2484 // (length is determined by call to JVM_GetClassCPEntriesCount)
2485 if (k->is_instance_klass()) {
2486 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2487 for (int index = cp->length() - 1; index >= 0; index--) {
2488 constantTag tag = cp->tag_at(index);
2489 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2490 }
2491 }
2492 JVM_END
2493
2494
2495 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2496 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2497 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2498 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2499 JVM_END
2500
2501
2502 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2504 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2505 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2506 JVM_END
2507
2508
2509 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2511 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2512 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2513 JVM_END
2514
2515
2516 // The following methods, used for the verifier, are never called with
2517 // array klasses, so a direct cast to InstanceKlass is safe.
2518 // Typically, these methods are called in a loop with bounds determined
2519 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2520 // zero for arrays.
2521 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2524 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2525 int length = method->checked_exceptions_length();
2526 if (length > 0) {
2527 CheckedExceptionElement* table= method->checked_exceptions_start();
2528 for (int i = 0; i < length; i++) {
2529 exceptions[i] = table[i].class_cp_index;
2530 }
2531 }
2532 JVM_END
2533
2534
2535 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2536 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2537 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2538 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2539 return method->checked_exceptions_length();
2540 JVM_END
2541
2542
2543 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2547 memcpy(code, method->code_base(), method->code_size());
2548 JVM_END
2549
2550
2551 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2552 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2553 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2554 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2555 return method->code_size();
2556 JVM_END
2557
2558
2559 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2563 ExceptionTable extable(method);
2564 entry->start_pc = extable.start_pc(entry_index);
2565 entry->end_pc = extable.end_pc(entry_index);
2566 entry->handler_pc = extable.handler_pc(entry_index);
2567 entry->catchType = extable.catch_type_index(entry_index);
2568 JVM_END
2569
2570
2571 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2573 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2574 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2575 return method->exception_table_length();
2576 JVM_END
2577
2578
2579 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2580 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2581 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2582 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2583 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2584 JVM_END
2585
2586
2587 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2588 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2589 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2590 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2591 JVM_END
2592
2593
2594 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2595 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2596 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2597 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2598 return method->max_locals();
2599 JVM_END
2600
2601
2602 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2604 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2605 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2606 return method->size_of_parameters();
2607 JVM_END
2608
2609
2610 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2614 return method->verifier_max_stack();
2615 JVM_END
2616
2617
2618 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2619 ResourceMark rm(THREAD);
2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2621 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2622 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2623 return method->name() == vmSymbols::object_initializer_name();
2624 JVM_END
2625
2626
2627 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2628 ResourceMark rm(THREAD);
2629 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2630 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2631 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2632 return method->is_overpass();
2633 JVM_END
2634
2635 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2636 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2637 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2638 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2639 return method->name()->as_utf8();
2640 JVM_END
2641
2642
2643 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2644 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2645 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2646 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2647 return method->signature()->as_utf8();
2648 JVM_END
2649
2650 /**
2651 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2652 * read entries in the constant pool. Since the old verifier always
2653 * works on a copy of the code, it will not see any rewriting that
2654 * may possibly occur in the middle of verification. So it is important
2655 * that nothing it calls tries to use the cpCache instead of the raw
2656 * constant pool, so we must use cp->uncached_x methods when appropriate.
2657 */
2658 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2661 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2662 switch (cp->tag_at(cp_index).value()) {
2663 case JVM_CONSTANT_Fieldref:
2664 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2665 default:
2666 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2667 }
2668 ShouldNotReachHere();
2669 return nullptr;
2670 JVM_END
2671
2672
2673 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2676 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2677 switch (cp->tag_at(cp_index).value()) {
2678 case JVM_CONSTANT_InterfaceMethodref:
2679 case JVM_CONSTANT_Methodref:
2680 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2681 default:
2682 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2683 }
2684 ShouldNotReachHere();
2685 return nullptr;
2686 JVM_END
2687
2688
2689 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2690 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2691 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2692 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2693 switch (cp->tag_at(cp_index).value()) {
2694 case JVM_CONSTANT_InterfaceMethodref:
2695 case JVM_CONSTANT_Methodref:
2696 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2697 default:
2698 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2699 }
2700 ShouldNotReachHere();
2701 return nullptr;
2702 JVM_END
2703
2704
2705 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_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 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2709 switch (cp->tag_at(cp_index).value()) {
2710 case JVM_CONSTANT_Fieldref:
2711 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2712 default:
2713 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2714 }
2715 ShouldNotReachHere();
2716 return nullptr;
2717 JVM_END
2718
2719
2720 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2721 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2722 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2723 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2724 Symbol* classname = cp->klass_name_at(cp_index);
2725 return classname->as_utf8();
2726 JVM_END
2727
2728
2729 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2730 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2731 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2732 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2733 switch (cp->tag_at(cp_index).value()) {
2734 case JVM_CONSTANT_Fieldref: {
2735 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2736 Symbol* classname = cp->klass_name_at(class_index);
2737 return classname->as_utf8();
2738 }
2739 default:
2740 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2741 }
2742 ShouldNotReachHere();
2743 return nullptr;
2744 JVM_END
2745
2746
2747 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2748 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2749 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2750 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2751 switch (cp->tag_at(cp_index).value()) {
2752 case JVM_CONSTANT_Methodref:
2753 case JVM_CONSTANT_InterfaceMethodref: {
2754 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2755 Symbol* classname = cp->klass_name_at(class_index);
2756 return classname->as_utf8();
2757 }
2758 default:
2759 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2760 }
2761 ShouldNotReachHere();
2762 return nullptr;
2763 JVM_END
2764
2765
2766 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2767 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2768 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2769 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2770 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2771 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2772 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2773 switch (cp->tag_at(cp_index).value()) {
2774 case JVM_CONSTANT_Fieldref: {
2775 Symbol* name = cp->uncached_name_ref_at(cp_index);
2776 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2777 InstanceKlass* ik = InstanceKlass::cast(k_called);
2778 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2779 if (fs.name() == name && fs.signature() == signature) {
2780 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2781 }
2782 }
2783 return -1;
2784 }
2785 default:
2786 fatal("JVM_GetCPFieldModifiers: illegal constant");
2787 }
2788 ShouldNotReachHere();
2789 return 0;
2790 JVM_END
2791
2792
2793 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2794 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2795 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2796 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2797 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2798 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2799 switch (cp->tag_at(cp_index).value()) {
2800 case JVM_CONSTANT_Methodref:
2801 case JVM_CONSTANT_InterfaceMethodref: {
2802 Symbol* name = cp->uncached_name_ref_at(cp_index);
2803 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2804 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2805 int methods_count = methods->length();
2806 for (int i = 0; i < methods_count; i++) {
2807 Method* method = methods->at(i);
2808 if (method->name() == name && method->signature() == signature) {
2809 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2810 }
2811 }
2812 return -1;
2813 }
2814 default:
2815 fatal("JVM_GetCPMethodModifiers: illegal constant");
2816 }
2817 ShouldNotReachHere();
2818 return 0;
2819 JVM_END
2820
2821
2822 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2823
2824 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2825 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2826 JVM_END
2827
2828
2829 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2830 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2831 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2832 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2833 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2834 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2835 JVM_END
2836
2837 // Printing support //////////////////////////////////////////////////
2838 extern "C" {
2839
2840 ATTRIBUTE_PRINTF(3, 0)
2841 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2842 // Reject count values that are negative signed values converted to
2843 // unsigned; see bug 4399518, 4417214
2844 if ((intptr_t)count <= 0) return -1;
2845
2846 int result = os::vsnprintf(str, count, fmt, args);
2847 if (result > 0 && (size_t)result >= count) {
2848 result = -1;
2849 }
2850
2851 return result;
2852 }
2853
2854 ATTRIBUTE_PRINTF(3, 4)
2855 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2856 va_list args;
2857 int len;
2858 va_start(args, fmt);
2859 len = jio_vsnprintf(str, count, fmt, args);
2860 va_end(args);
2861 return len;
2862 }
2863
2864 ATTRIBUTE_PRINTF(2, 3)
2865 int jio_fprintf(FILE* f, const char *fmt, ...) {
2866 int len;
2867 va_list args;
2868 va_start(args, fmt);
2869 len = jio_vfprintf(f, fmt, args);
2870 va_end(args);
2871 return len;
2872 }
2873
2874 ATTRIBUTE_PRINTF(2, 0)
2875 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2876 if (Arguments::vfprintf_hook() != nullptr) {
2877 return Arguments::vfprintf_hook()(f, fmt, args);
2878 } else {
2879 return vfprintf(f, fmt, args);
2880 }
2881 }
2882
2883 ATTRIBUTE_PRINTF(1, 2)
2884 JNIEXPORT int jio_printf(const char *fmt, ...) {
2885 int len;
2886 va_list args;
2887 va_start(args, fmt);
2888 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2889 va_end(args);
2890 return len;
2891 }
2892
2893 // HotSpot specific jio method
2894 void jio_print(const char* s, size_t len) {
2895 // Try to make this function as atomic as possible.
2896 if (Arguments::vfprintf_hook() != nullptr) {
2897 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2898 } else {
2899 // Make an unused local variable to avoid warning from gcc compiler.
2900 bool dummy = os::write(defaultStream::output_fd(), s, len);
2901 }
2902 }
2903
2904 } // Extern C
2905
2906 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2907
2908 // In most of the JVM thread support functions we need to access the
2909 // thread through a ThreadsListHandle to prevent it from exiting and
2910 // being reclaimed while we try to operate on it. The exceptions to this
2911 // rule are when operating on the current thread, or if the monitor of
2912 // the target java.lang.Thread is locked at the Java level - in both
2913 // cases the target cannot exit.
2914
2915 static void thread_entry(JavaThread* thread, TRAPS) {
2916 HandleMark hm(THREAD);
2917 Handle obj(THREAD, thread->threadObj());
2918 JavaValue result(T_VOID);
2919 JavaCalls::call_virtual(&result,
2920 obj,
2921 vmClasses::Thread_klass(),
2922 vmSymbols::run_method_name(),
2923 vmSymbols::void_method_signature(),
2924 THREAD);
2925 }
2926
2927
2928 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2929 #if INCLUDE_CDS
2930 if (DumpSharedSpaces) {
2931 // During java -Xshare:dump, if we allow multiple Java threads to
2932 // execute in parallel, symbols and classes may be loaded in
2933 // random orders which will make the resulting CDS archive
2934 // non-deterministic.
2935 //
2936 // Lucikly, during java -Xshare:dump, it's important to run only
2937 // the code in the main Java thread (which is NOT started here) that
2938 // creates the module graph, etc. It's safe to not start the other
2939 // threads which are launched by class static initializers
2940 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2941 if (log_is_enabled(Info, cds)) {
2942 ResourceMark rm;
2943 oop t = JNIHandles::resolve_non_null(jthread);
2944 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2945 }
2946 return;
2947 }
2948 #endif
2949 JavaThread *native_thread = nullptr;
2950
2951 // We cannot hold the Threads_lock when we throw an exception,
2952 // due to rank ordering issues. Example: we might need to grab the
2953 // Heap_lock while we construct the exception.
2954 bool throw_illegal_thread_state = false;
2955
2956 // We must release the Threads_lock before we can post a jvmti event
2957 // in Thread::start.
2958 {
2959 // Ensure that the C++ Thread and OSThread structures aren't freed before
2960 // we operate.
2961 MutexLocker mu(Threads_lock);
2962
2963 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2964 // re-starting an already started thread, so we should usually find
2965 // that the JavaThread is null. However for a JNI attached thread
2966 // there is a small window between the Thread object being created
2967 // (with its JavaThread set) and the update to its threadStatus, so we
2968 // have to check for this
2969 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2970 throw_illegal_thread_state = true;
2971 } else {
2972 jlong size =
2973 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2974 // Allocate the C++ Thread structure and create the native thread. The
2975 // stack size retrieved from java is 64-bit signed, but the constructor takes
2976 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2977 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2978 // - Avoid passing negative values which would result in really large stacks.
2979 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2980 size_t sz = size > 0 ? (size_t) size : 0;
2981 native_thread = new JavaThread(&thread_entry, sz);
2982
2983 // At this point it may be possible that no osthread was created for the
2984 // JavaThread due to lack of memory. Check for this situation and throw
2985 // an exception if necessary. Eventually we may want to change this so
2986 // that we only grab the lock if the thread was created successfully -
2987 // then we can also do this check and throw the exception in the
2988 // JavaThread constructor.
2989 if (native_thread->osthread() != nullptr) {
2990 // Note: the current thread is not being used within "prepare".
2991 native_thread->prepare(jthread);
2992 }
2993 }
2994 }
2995
2996 if (throw_illegal_thread_state) {
2997 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2998 }
2999
3000 assert(native_thread != nullptr, "Starting null thread?");
3001
3002 if (native_thread->osthread() == nullptr) {
3003 ResourceMark rm(thread);
3004 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3005 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3006 // No one should hold a reference to the 'native_thread'.
3007 native_thread->smr_delete();
3008 if (JvmtiExport::should_post_resource_exhausted()) {
3009 JvmtiExport::post_resource_exhausted(
3010 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3011 os::native_thread_creation_failed_msg());
3012 }
3013 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3014 os::native_thread_creation_failed_msg());
3015 }
3016
3017 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3018
3019 Thread::start(native_thread);
3020
3021 JVM_END
3022
3023
3024 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3025 ThreadsListHandle tlh(thread);
3026 oop java_thread = nullptr;
3027 JavaThread* receiver = nullptr;
3028 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3029 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3030
3031 if (is_alive) {
3032 // jthread refers to a live JavaThread.
3033 Thread::set_priority(receiver, (ThreadPriority)prio);
3034 }
3035 // Implied else: If the JavaThread hasn't started yet, then the
3036 // priority set in the java.lang.Thread object above will be pushed
3037 // down when it does start.
3038 JVM_END
3039
3040
3041 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3042 if (os::dont_yield()) return;
3043 HOTSPOT_THREAD_YIELD();
3044 os::naked_yield();
3045 JVM_END
3046
3047 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong nanos))
3048 if (nanos < 0) {
3049 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3050 }
3051
3052 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3053 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3054 }
3055
3056 // Save current thread state and restore it at the end of this block.
3057 // And set new thread state to SLEEPING.
3058 JavaThreadSleepState jtss(thread);
3059
3060 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3061
3062 if (nanos == 0) {
3063 os::naked_yield();
3064 } else {
3065 ThreadState old_state = thread->osthread()->get_state();
3066 thread->osthread()->set_state(SLEEPING);
3067 if (!thread->sleep_nanos(nanos)) { // interrupted
3068 // An asynchronous exception could have been thrown on
3069 // us while we were sleeping. We do not overwrite those.
3070 if (!HAS_PENDING_EXCEPTION) {
3071 HOTSPOT_THREAD_SLEEP_END(1);
3072
3073 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3074 // to properly restore the thread state. That's likely wrong.
3075 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3076 }
3077 }
3078 thread->osthread()->set_state(old_state);
3079 }
3080 HOTSPOT_THREAD_SLEEP_END(0);
3081 JVM_END
3082
3083 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3084 oop jthread = thread->threadObj();
3085 assert(jthread != nullptr, "no current carrier thread!");
3086 return JNIHandles::make_local(THREAD, jthread);
3087 JVM_END
3088
3089 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3090 oop theThread = thread->vthread();
3091 assert(theThread != (oop)nullptr, "no current thread!");
3092 return JNIHandles::make_local(THREAD, theThread);
3093 JVM_END
3094
3095 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3096 jobject theThread))
3097 oop threadObj = JNIHandles::resolve(theThread);
3098 thread->set_vthread(threadObj);
3099 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3100 JVM_END
3101
3102 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3103 return ThreadIdentifier::unsafe_offset();
3104 JVM_END
3105
3106 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3107 ThreadsListHandle tlh(thread);
3108 JavaThread* receiver = nullptr;
3109 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3110 if (is_alive) {
3111 // jthread refers to a live JavaThread.
3112 receiver->interrupt();
3113 }
3114 JVM_END
3115
3116 // Return true iff the current thread has locked the object passed in
3117
3118 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3119 if (obj == nullptr) {
3120 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3121 }
3122 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3123 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3124 JVM_END
3125
3126 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3127 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3128 return JNIHandles::make_local(THREAD, trace);
3129 JVM_END
3130
3131 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3132 VM_PrintThreads op;
3133 VMThread::execute(&op);
3134 if (JvmtiExport::should_post_data_dump()) {
3135 JvmtiExport::post_data_dump();
3136 }
3137 JVM_END
3138
3139 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3140 // We don't use a ThreadsListHandle here because the current thread
3141 // must be alive.
3142 oop java_thread = JNIHandles::resolve_non_null(jthread);
3143 JavaThread* thr = java_lang_Thread::thread(java_thread);
3144 if (thread == thr && !thr->has_attached_via_jni()) {
3145 // Thread naming is only supported for the current thread and
3146 // we don't set the name of an attached thread to avoid stepping
3147 // on other programs.
3148 ResourceMark rm(thread);
3149 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3150 os::set_native_thread_name(thread_name);
3151 }
3152 JVM_END
3153
3154 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3155 oop theCache = thread->scopedValueCache();
3156 return JNIHandles::make_local(THREAD, theCache);
3157 JVM_END
3158
3159 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3160 jobject theCache))
3161 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3162 thread->set_scopedValueCache(objs);
3163 JVM_END
3164
3165 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3166
3167 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3168 ResourceMark rm(THREAD);
3169 JvmtiVMObjectAllocEventCollector oam;
3170 vframeStream vfst(thread);
3171
3172 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3173 // This must only be called from SecurityManager.getClassContext
3174 Method* m = vfst.method();
3175 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3176 m->name() == vmSymbols::getClassContext_name() &&
3177 m->signature() == vmSymbols::void_class_array_signature())) {
3178 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3179 }
3180 }
3181
3182 // Collect method holders
3183 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3184 for (; !vfst.at_end(); vfst.security_next()) {
3185 Method* m = vfst.method();
3186 // Native frames are not returned
3187 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3188 Klass* holder = m->method_holder();
3189 assert(holder->is_klass(), "just checking");
3190 klass_array->append(holder);
3191 }
3192 }
3193
3194 // Create result array of type [Ljava/lang/Class;
3195 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3196 // Fill in mirrors corresponding to method holders
3197 for (int i = 0; i < klass_array->length(); i++) {
3198 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3199 }
3200
3201 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3202 JVM_END
3203
3204
3205 // java.lang.Package ////////////////////////////////////////////////////////////////
3206
3207
3208 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3209 ResourceMark rm(THREAD);
3210 JvmtiVMObjectAllocEventCollector oam;
3211 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3212 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3213 return (jstring) JNIHandles::make_local(THREAD, result);
3214 JVM_END
3215
3216
3217 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3218 JvmtiVMObjectAllocEventCollector oam;
3219 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3220 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3221 JVM_END
3222
3223
3224 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3225
3226
3227 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3228 MonitorLocker ml(Heap_lock);
3229 oop ref = Universe::reference_pending_list();
3230 if (ref != nullptr) {
3231 Universe::clear_reference_pending_list();
3232 }
3233 return JNIHandles::make_local(THREAD, ref);
3234 JVM_END
3235
3236 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3237 MonitorLocker ml(Heap_lock);
3238 return Universe::has_reference_pending_list();
3239 JVM_END
3240
3241 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3242 MonitorLocker ml(Heap_lock);
3243 while (!Universe::has_reference_pending_list()) {
3244 ml.wait();
3245 }
3246 JVM_END
3247
3248 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3249 oop ref_oop = JNIHandles::resolve_non_null(ref);
3250 // PhantomReference has it's own implementation of refersTo().
3251 // See: JVM_PhantomReferenceRefersTo
3252 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3253 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3254 return referent == JNIHandles::resolve(o);
3255 JVM_END
3256
3257 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3258 oop ref_oop = JNIHandles::resolve_non_null(ref);
3259 // FinalReference has it's own implementation of clear().
3260 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3261 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3262 // If the referent has already been cleared then done.
3263 // However, if the referent is dead but has not yet been cleared by
3264 // concurrent reference processing, it should NOT be cleared here.
3265 // Instead, clearing should be left to the GC. Clearing it here could
3266 // detectably lose an expected notification, which is impossible with
3267 // STW reference processing. The clearing in enqueue() doesn't have
3268 // this problem, since the enqueue covers the notification, but it's not
3269 // worth the effort to handle that case specially.
3270 return;
3271 }
3272 java_lang_ref_Reference::clear_referent(ref_oop);
3273 JVM_END
3274
3275
3276 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3277
3278
3279 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3280 oop ref_oop = JNIHandles::resolve_non_null(ref);
3281 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3282 return referent == JNIHandles::resolve(o);
3283 JVM_END
3284
3285
3286 // ObjectInputStream ///////////////////////////////////////////////////////////////
3287
3288 // Return the first user-defined class loader up the execution stack, or null
3289 // if only code from the bootstrap or platform class loader is on the stack.
3290
3291 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3292 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3293 InstanceKlass* ik = vfst.method()->method_holder();
3294 oop loader = ik->class_loader();
3295 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3296 // Skip reflection related frames
3297 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3298 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3299 return JNIHandles::make_local(THREAD, loader);
3300 }
3301 }
3302 }
3303 return nullptr;
3304 JVM_END
3305
3306
3307 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3308
3309
3310 // resolve array handle and check arguments
3311 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3312 if (arr == nullptr) {
3313 THROW_0(vmSymbols::java_lang_NullPointerException());
3314 }
3315 oop a = JNIHandles::resolve_non_null(arr);
3316 if (!a->is_array()) {
3317 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3318 } else if (type_array_only && !a->is_typeArray()) {
3319 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3320 }
3321 return arrayOop(a);
3322 }
3323
3324
3325 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3326 arrayOop a = check_array(env, arr, false, CHECK_0);
3327 return a->length();
3328 JVM_END
3329
3330
3331 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3332 JvmtiVMObjectAllocEventCollector oam;
3333 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3334 jvalue value;
3335 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3336 oop box = Reflection::box(&value, type, CHECK_NULL);
3337 return JNIHandles::make_local(THREAD, box);
3338 JVM_END
3339
3340
3341 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3342 jvalue value;
3343 value.i = 0; // to initialize value before getting used in CHECK
3344 arrayOop a = check_array(env, arr, true, CHECK_(value));
3345 assert(a->is_typeArray(), "just checking");
3346 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3347 BasicType wide_type = (BasicType) wCode;
3348 if (type != wide_type) {
3349 Reflection::widen(&value, type, wide_type, CHECK_(value));
3350 }
3351 return value;
3352 JVM_END
3353
3354
3355 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3356 arrayOop a = check_array(env, arr, false, CHECK);
3357 oop box = JNIHandles::resolve(val);
3358 jvalue value;
3359 value.i = 0; // to initialize value before getting used in CHECK
3360 BasicType value_type;
3361 if (a->is_objArray()) {
3362 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3363 value_type = Reflection::unbox_for_regular_object(box, &value);
3364 } else {
3365 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3366 }
3367 Reflection::array_set(&value, a, index, value_type, CHECK);
3368 JVM_END
3369
3370
3371 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3372 arrayOop a = check_array(env, arr, true, CHECK);
3373 assert(a->is_typeArray(), "just checking");
3374 BasicType value_type = (BasicType) vCode;
3375 Reflection::array_set(&v, a, index, value_type, CHECK);
3376 JVM_END
3377
3378
3379 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3380 JvmtiVMObjectAllocEventCollector oam;
3381 oop element_mirror = JNIHandles::resolve(eltClass);
3382 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3383 return JNIHandles::make_local(THREAD, result);
3384 JVM_END
3385
3386
3387 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3388 JvmtiVMObjectAllocEventCollector oam;
3389 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3390 oop element_mirror = JNIHandles::resolve(eltClass);
3391 assert(dim_array->is_typeArray(), "just checking");
3392 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3393 return JNIHandles::make_local(THREAD, result);
3394 JVM_END
3395
3396
3397 // Library support ///////////////////////////////////////////////////////////////////////////
3398
3399 JVM_LEAF(void*, JVM_LoadZipLibrary())
3400 ClassLoader::load_zip_library_if_needed();
3401 return ClassLoader::zip_library_handle();
3402 JVM_END
3403
3404 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3405 //%note jvm_ct
3406 char ebuf[1024];
3407 void *load_result;
3408 {
3409 ThreadToNativeFromVM ttnfvm(thread);
3410 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3411 }
3412 if (load_result == nullptr) {
3413 if (throwException) {
3414 char msg[1024];
3415 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3416 // Since 'ebuf' may contain a string encoded using
3417 // platform encoding scheme, we need to pass
3418 // Exceptions::unsafe_to_utf8 to the new_exception method
3419 // as the last argument. See bug 6367357.
3420 Handle h_exception =
3421 Exceptions::new_exception(thread,
3422 vmSymbols::java_lang_UnsatisfiedLinkError(),
3423 msg, Exceptions::unsafe_to_utf8);
3424
3425 THROW_HANDLE_0(h_exception);
3426 } else {
3427 log_info(library)("Failed to load library %s", name);
3428 return load_result;
3429 }
3430 }
3431 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3432 return load_result;
3433 JVM_END
3434
3435
3436 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3437 os::dll_unload(handle);
3438 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3439 JVM_END
3440
3441
3442 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3443 void* find_result = os::dll_lookup(handle, name);
3444 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3445 find_result != nullptr ? "Found" : "Failed to find",
3446 name, p2i(handle));
3447 return find_result;
3448 JVM_END
3449
3450
3451 // JNI version ///////////////////////////////////////////////////////////////////////////////
3452
3453 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3454 return Threads::is_supported_jni_version_including_1_1(version);
3455 JVM_END
3456
3457
3458 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3459 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3460 JVM_END
3461
3462 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3463 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3464 JVM_END
3465
3466 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3467 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3468 JVM_END
3469
3470 // String support ///////////////////////////////////////////////////////////////////////////
3471
3472 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3473 JvmtiVMObjectAllocEventCollector oam;
3474 if (str == nullptr) return nullptr;
3475 oop string = JNIHandles::resolve_non_null(str);
3476 oop result = StringTable::intern(string, CHECK_NULL);
3477 return (jstring) JNIHandles::make_local(THREAD, result);
3478 JVM_END
3479
3480
3481 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3482
3483 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3484 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3485 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3486 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3487 // nature. JavaThreads will be "in native" when using this API from JDK code.
3488
3489
3490 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3491 VM_Exit::block_if_vm_exited();
3492 return new PlatformMutex();
3493 }
3494
3495
3496 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3497 VM_Exit::block_if_vm_exited();
3498 delete ((PlatformMutex*) mon);
3499 }
3500
3501
3502 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3503 VM_Exit::block_if_vm_exited();
3504 ((PlatformMutex*) mon)->lock();
3505 return 0;
3506 }
3507
3508
3509 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3510 VM_Exit::block_if_vm_exited();
3511 ((PlatformMutex*) mon)->unlock();
3512 }
3513
3514
3515 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3516
3517 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3518 Handle loader, Handle protection_domain,
3519 jboolean throwError, TRAPS) {
3520 // Security Note:
3521 // The Java level wrapper will perform the necessary security check allowing
3522 // us to pass the null as the initiating class loader. The VM is responsible for
3523 // the checkPackageAccess relative to the initiating class loader via the
3524 // protection_domain. The protection_domain is passed as null by the java code
3525 // if there is no security manager in 3-arg Class.forName().
3526 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3527
3528 // Check if we should initialize the class
3529 if (init && klass->is_instance_klass()) {
3530 klass->initialize(CHECK_NULL);
3531 }
3532 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3533 }
3534
3535
3536 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3537
3538 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3539 Handle method_handle;
3540 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3541 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3542 Handle receiver(THREAD, JNIHandles::resolve(obj));
3543 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3544 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3545 jobject res = JNIHandles::make_local(THREAD, result);
3546 if (JvmtiExport::should_post_vm_object_alloc()) {
3547 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3548 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3549 if (java_lang_Class::is_primitive(ret_type)) {
3550 // Only for primitive type vm allocates memory for java object.
3551 // See box() method.
3552 JvmtiExport::post_vm_object_alloc(thread, result);
3553 }
3554 }
3555 return res;
3556 } else {
3557 THROW_0(vmSymbols::java_lang_StackOverflowError());
3558 }
3559 JVM_END
3560
3561
3562 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3563 oop constructor_mirror = JNIHandles::resolve(c);
3564 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3565 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3566 jobject res = JNIHandles::make_local(THREAD, result);
3567 if (JvmtiExport::should_post_vm_object_alloc()) {
3568 JvmtiExport::post_vm_object_alloc(thread, result);
3569 }
3570 return res;
3571 JVM_END
3572
3573 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3574
3575 JVM_LEAF(jboolean, JVM_SupportsCX8())
3576 return VM_Version::supports_cx8();
3577 JVM_END
3578
3579 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3580 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3581 assert(k->is_klass(), "just checking");
3582 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3583 JVM_END
3584
3585 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3586 jclass caller,
3587 jstring interfaceMethodName,
3588 jobject factoryType,
3589 jobject interfaceMethodType,
3590 jobject implementationMember,
3591 jobject dynamicMethodType,
3592 jclass lambdaProxyClass))
3593 #if INCLUDE_CDS
3594 if (!Arguments::is_dumping_archive()) {
3595 return;
3596 }
3597
3598 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3599 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3600 if (caller_ik->is_hidden()) {
3601 // Hidden classes not of type lambda proxy classes are currently not being archived.
3602 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3603 // registered for archiving.
3604 return;
3605 }
3606 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3607 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3608 assert(lambda_ik->is_hidden(), "must be a hidden class");
3609 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3610
3611 Symbol* interface_method_name = nullptr;
3612 if (interfaceMethodName != nullptr) {
3613 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3614 }
3615 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3616 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3617
3618 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3619 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3620
3621 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3622 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3623 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3624
3625 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3626 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3627
3628 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3629 interface_method_type, m, dynamic_method_type, THREAD);
3630 #endif // INCLUDE_CDS
3631 JVM_END
3632
3633 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3634 jclass caller,
3635 jstring interfaceMethodName,
3636 jobject factoryType,
3637 jobject interfaceMethodType,
3638 jobject implementationMember,
3639 jobject dynamicMethodType))
3640 #if INCLUDE_CDS
3641
3642 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3643 implementationMember == nullptr || dynamicMethodType == nullptr) {
3644 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3645 }
3646
3647 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3648 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3649 if (!caller_ik->is_shared()) {
3650 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3651 return nullptr;
3652 }
3653
3654 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3655 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3656 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3657
3658 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3659 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3660
3661 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3662 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3663 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3664
3665 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3666 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3667
3668 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3669 interface_method_type, m, dynamic_method_type);
3670 jclass jcls = nullptr;
3671 if (lambda_ik != nullptr) {
3672 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3673 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3674 }
3675 return jcls;
3676 #else
3677 return nullptr;
3678 #endif // INCLUDE_CDS
3679 JVM_END
3680
3681 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3682 return Arguments::is_dumping_archive();
3683 JVM_END
3684
3685 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3686 return UseSharedSpaces;
3687 JVM_END
3688
3689 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3690 if (DumpSharedSpaces) {
3691 const char* release = VM_Version::vm_release();
3692 const char* dbg_level = VM_Version::jdk_debug_level();
3693 const char* version = VM_Version::internal_vm_info_string();
3694 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3695 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3696 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3697 seed += (jlong)VM_Version::vm_major_version();
3698 seed += (jlong)VM_Version::vm_minor_version();
3699 seed += (jlong)VM_Version::vm_security_version();
3700 seed += (jlong)VM_Version::vm_patch_version();
3701 if (seed == 0) { // don't let this ever be zero.
3702 seed = 0x87654321;
3703 }
3704 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3705 return seed;
3706 } else {
3707 return 0;
3708 }
3709 JVM_END
3710
3711 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3712 #if INCLUDE_CDS
3713 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3714 #else
3715 return false;
3716 #endif // INCLUDE_CDS
3717 JVM_END
3718
3719 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3720 #if INCLUDE_CDS
3721 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3722 if (line != nullptr) {
3723 ResourceMark rm(THREAD);
3724 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3725 char* c_line = java_lang_String::as_utf8_string(h_line());
3726 if (DynamicDumpSharedSpaces) {
3727 // Note: LambdaFormInvokers::append take same format which is not
3728 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3729 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3730 }
3731 if (ClassListWriter::is_enabled()) {
3732 ClassListWriter w;
3733 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3734 }
3735 }
3736 #endif // INCLUDE_CDS
3737 JVM_END
3738
3739 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3740 #if INCLUDE_CDS
3741 ResourceMark rm(THREAD);
3742 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3743 char* file_name = java_lang_String::as_utf8_string(file_handle());
3744 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3745 #endif // INCLUDE_CDS
3746 JVM_END
3747
3748 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3749 #if INCLUDE_CDS
3750 ResourceMark rm(THREAD);
3751 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3752 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3753 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3754 #endif // INCLUDE_CDS
3755 JVM_END
3756
3757 // Returns an array of all live Thread objects (VM internal JavaThreads,
3758 // jvmti agent threads, and JNI attaching threads are skipped)
3759 // See CR 6404306 regarding JNI attaching threads
3760 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3761 ResourceMark rm(THREAD);
3762 ThreadsListEnumerator tle(THREAD, false, false);
3763 JvmtiVMObjectAllocEventCollector oam;
3764
3765 int num_threads = tle.num_threads();
3766 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3767 objArrayHandle threads_ah(THREAD, r);
3768
3769 for (int i = 0; i < num_threads; i++) {
3770 Handle h = tle.get_threadObj(i);
3771 threads_ah->obj_at_put(i, h());
3772 }
3773
3774 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3775 JVM_END
3776
3777
3778 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3779 // Return StackTraceElement[][], each element is the stack trace of a thread in
3780 // the corresponding entry in the given threads array
3781 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3782 JvmtiVMObjectAllocEventCollector oam;
3783
3784 // Check if threads is null
3785 if (threads == nullptr) {
3786 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3787 }
3788
3789 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3790 objArrayHandle ah(THREAD, a);
3791 int num_threads = ah->length();
3792 // check if threads is non-empty array
3793 if (num_threads == 0) {
3794 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3795 }
3796
3797 // check if threads is not an array of objects of Thread class
3798 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3799 if (k != vmClasses::Thread_klass()) {
3800 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3801 }
3802
3803 ResourceMark rm(THREAD);
3804
3805 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3806 for (int i = 0; i < num_threads; i++) {
3807 oop thread_obj = ah->obj_at(i);
3808 instanceHandle h(THREAD, (instanceOop) thread_obj);
3809 thread_handle_array->append(h);
3810 }
3811
3812 // The JavaThread references in thread_handle_array are validated
3813 // in VM_ThreadDump::doit().
3814 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3815 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3816
3817 JVM_END
3818
3819 // JVM monitoring and management support
3820 JVM_LEAF(void*, JVM_GetManagement(jint version))
3821 return Management::get_jmm_interface(version);
3822 JVM_END
3823
3824 // com.sun.tools.attach.VirtualMachine agent properties support
3825 //
3826 // Initialize the agent properties with the properties maintained in the VM
3827 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3828 ResourceMark rm;
3829
3830 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3831
3832 PUTPROP(props, "sun.java.command", Arguments::java_command());
3833 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3834 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3835 return properties;
3836 JVM_END
3837
3838 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3839 {
3840 JvmtiVMObjectAllocEventCollector oam;
3841
3842 if (ofClass == nullptr) {
3843 return nullptr;
3844 }
3845 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3846 // Special handling for primitive objects
3847 if (java_lang_Class::is_primitive(mirror())) {
3848 return nullptr;
3849 }
3850 Klass* k = java_lang_Class::as_Klass(mirror());
3851 if (!k->is_instance_klass()) {
3852 return nullptr;
3853 }
3854 InstanceKlass* ik = InstanceKlass::cast(k);
3855 int encl_method_class_idx = ik->enclosing_method_class_index();
3856 if (encl_method_class_idx == 0) {
3857 return nullptr;
3858 }
3859 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3860 objArrayHandle dest(THREAD, dest_o);
3861 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3862 dest->obj_at_put(0, enc_k->java_mirror());
3863 int encl_method_method_idx = ik->enclosing_method_method_index();
3864 if (encl_method_method_idx != 0) {
3865 Symbol* sym = ik->constants()->symbol_at(
3866 extract_low_short_from_int(
3867 ik->constants()->name_and_type_at(encl_method_method_idx)));
3868 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3869 dest->obj_at_put(1, str());
3870 sym = ik->constants()->symbol_at(
3871 extract_high_short_from_int(
3872 ik->constants()->name_and_type_at(encl_method_method_idx)));
3873 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3874 dest->obj_at_put(2, str());
3875 }
3876 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3877 }
3878 JVM_END
3879
3880 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3881 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3882 ResourceMark rm(THREAD);
3883
3884 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3885 return nullptr;
3886 }
3887
3888 char** vm_flags = Arguments::jvm_flags_array();
3889 char** vm_args = Arguments::jvm_args_array();
3890 int num_flags = Arguments::num_jvm_flags();
3891 int num_args = Arguments::num_jvm_args();
3892
3893 InstanceKlass* ik = vmClasses::String_klass();
3894 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3895 objArrayHandle result_h(THREAD, r);
3896
3897 int index = 0;
3898 for (int j = 0; j < num_flags; j++, index++) {
3899 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3900 result_h->obj_at_put(index, h());
3901 }
3902 for (int i = 0; i < num_args; i++, index++) {
3903 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3904 result_h->obj_at_put(index, h());
3905 }
3906 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3907 JVM_END
3908
3909 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3910 return os::get_signal_number(name);
3911 JVM_END
3912
3913 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3914 #if INCLUDE_JVMTI
3915 if (!DoJVMTIVirtualThreadTransitions) {
3916 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3917 return;
3918 }
3919 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3920 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3921 } else {
3922 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3923 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3924 }
3925 #else
3926 fatal("Should only be called with JVMTI enabled");
3927 #endif
3928 JVM_END
3929
3930 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3931 #if INCLUDE_JVMTI
3932 if (!DoJVMTIVirtualThreadTransitions) {
3933 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3934 return;
3935 }
3936 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3937 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3938 } else {
3939 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3940 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3941 }
3942 #else
3943 fatal("Should only be called with JVMTI enabled");
3944 #endif
3945 JVM_END
3946
3947 // If notifications are disabled then just update the VTMS transition bit and return.
3948 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3949 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3950 #if INCLUDE_JVMTI
3951 if (!DoJVMTIVirtualThreadTransitions) {
3952 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3953 return;
3954 }
3955 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3956 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3957 } else {
3958 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3959 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3960 }
3961 #else
3962 fatal("Should only be called with JVMTI enabled");
3963 #endif
3964 JVM_END
3965
3966 // If notifications are disabled then just update the VTMS transition bit and return.
3967 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3968 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3969 #if INCLUDE_JVMTI
3970 if (!DoJVMTIVirtualThreadTransitions) {
3971 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3972 return;
3973 }
3974 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3975 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3976 } else {
3977 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3978 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3979 }
3980 #else
3981 fatal("Should only be called with JVMTI enabled");
3982 #endif
3983 JVM_END
3984
3985 // Always update the temporary VTMS transition bit.
3986 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
3987 #if INCLUDE_JVMTI
3988 if (!DoJVMTIVirtualThreadTransitions) {
3989 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3990 return;
3991 }
3992 assert(!thread->is_in_VTMS_transition(), "sanity check");
3993 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
3994 thread->toggle_is_in_tmp_VTMS_transition();
3995 #else
3996 fatal("Should only be called with JVMTI enabled");
3997 #endif
3998 JVM_END
3999
4000 /*
4001 * Return the current class's class file version. The low order 16 bits of the
4002 * returned jint contain the class's major version. The high order 16 bits
4003 * contain the class's minor version.
4004 */
4005 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4006 oop mirror = JNIHandles::resolve_non_null(current);
4007 if (java_lang_Class::is_primitive(mirror)) {
4008 // return latest major version and minor version of 0.
4009 return JVM_CLASSFILE_MAJOR_VERSION;
4010 }
4011 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4012
4013 Klass* c = java_lang_Class::as_Klass(mirror);
4014 assert(c->is_instance_klass(), "must be");
4015 InstanceKlass* ik = InstanceKlass::cast(c);
4016 return (ik->minor_version() << 16) | ik->major_version();
4017 JVM_END
4018
4019 /*
4020 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4021 * get the value will see a materialized value and not a scalar-replaced
4022 * null value.
4023 */
4024 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4025 JVM_EnsureMaterializedForStackWalk(env, value);
4026 JVM_END
4027
4028 /*
4029 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4030 */
4031 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4032 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4033 JVM_END