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 jdk.internal.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
1020 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1021 // non-hidden class or nestmate class must be in the same package as the Lookup class
1022 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1023 }
1024
1025 if (init) {
1026 ik->initialize(CHECK_NULL);
1027 } else {
1028 ik->link_class(CHECK_NULL);
1029 }
1030
1031 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1032 }
1033
1034 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1035 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1036 JVM_END
1037
1038 /*
1039 * Define a class with the specified lookup class.
1040 * lookup: Lookup class
1041 * name: the name of the class
1042 * buf: class bytes
1043 * len: length of class bytes
1044 * pd: protection domain
1045 * init: initialize the class
1046 * flags: properties of the class
1047 * classData: private static pre-initialized field
1048 */
1049 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1050 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1051
1052 if (lookup == nullptr) {
1053 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1054 }
1055
1056 assert(buf != nullptr, "buf must not be null");
1057
1058 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1059 JVM_END
1060
1061 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1062
1063 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1064 JVM_END
1065
1066 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1067 ResourceMark rm(THREAD);
1068
1069 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1070 char* str = java_lang_String::as_utf8_string(h_name());
1071
1072 // Sanity check, don't expect null
1073 if (str == nullptr) return nullptr;
1074
1075 // Internalize the string, converting '.' to '/' in string.
1076 char* p = (char*)str;
1077 while (*p != '\0') {
1078 if (*p == '.') {
1079 *p = '/';
1080 }
1081 p++;
1082 }
1083
1084 const int str_len = (int)(p - str);
1085 if (str_len > Symbol::max_length()) {
1086 // It's impossible to create this class; the name cannot fit
1087 // into the constant pool.
1088 return nullptr;
1089 }
1090 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1091
1092 // Security Note:
1093 // The Java level wrapper will perform the necessary security check allowing
1094 // us to pass the null as the initiating class loader.
1095 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1096 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1097 h_loader,
1098 Handle());
1099 #if INCLUDE_CDS
1100 if (k == nullptr) {
1101 // If the class is not already loaded, try to see if it's in the shared
1102 // archive for the current classloader (h_loader).
1103 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1104 }
1105 #endif
1106 return (k == nullptr) ? nullptr :
1107 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1108 JVM_END
1109
1110 // Module support //////////////////////////////////////////////////////////////////////////////
1111
1112 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1113 jstring location, jobjectArray packages))
1114 Handle h_module (THREAD, JNIHandles::resolve(module));
1115 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1116 JVM_END
1117
1118 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1119 Handle h_module (THREAD, JNIHandles::resolve(module));
1120 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1121 JVM_END
1122
1123 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1124 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1125 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1126 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1127 JVM_END
1128
1129 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1130 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1131 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1132 JVM_END
1133
1134 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1135 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1136 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1137 JVM_END
1138
1139 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1140 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1141 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1142 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1143 JVM_END
1144
1145 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1146 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1147 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1148 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1149 JVM_END
1150
1151 // Reflection support //////////////////////////////////////////////////////////////////////////////
1152
1153 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1154 assert (cls != nullptr, "illegal class");
1155 JvmtiVMObjectAllocEventCollector oam;
1156 ResourceMark rm(THREAD);
1157 HandleMark hm(THREAD);
1158 Handle java_class(THREAD, JNIHandles::resolve(cls));
1159 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1160 return (jstring) JNIHandles::make_local(THREAD, result);
1161 JVM_END
1162
1163
1164 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1165 JvmtiVMObjectAllocEventCollector oam;
1166 oop mirror = JNIHandles::resolve_non_null(cls);
1167
1168 // Special handling for primitive objects
1169 if (java_lang_Class::is_primitive(mirror)) {
1170 // Primitive objects does not have any interfaces
1171 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1172 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1173 }
1174
1175 Klass* klass = java_lang_Class::as_Klass(mirror);
1176 // Figure size of result array
1177 int size;
1178 if (klass->is_instance_klass()) {
1179 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1180 } else {
1181 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1182 size = 2;
1183 }
1184
1185 // Allocate result array
1186 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1187 objArrayHandle result (THREAD, r);
1188 // Fill in result
1189 if (klass->is_instance_klass()) {
1190 // Regular instance klass, fill in all local interfaces
1191 for (int index = 0; index < size; index++) {
1192 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1193 result->obj_at_put(index, k->java_mirror());
1194 }
1195 } else {
1196 // All arrays implement java.lang.Cloneable and java.io.Serializable
1197 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1198 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1199 }
1200 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1201 JVM_END
1202
1203
1204 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1205 oop mirror = JNIHandles::resolve_non_null(cls);
1206 if (java_lang_Class::is_primitive(mirror)) {
1207 return JNI_FALSE;
1208 }
1209 Klass* k = java_lang_Class::as_Klass(mirror);
1210 jboolean result = k->is_interface();
1211 assert(!result || k->is_instance_klass(),
1212 "all interfaces are instance types");
1213 // The compiler intrinsic for isInterface tests the
1214 // Klass::_access_flags bits in the same way.
1215 return result;
1216 JVM_END
1217
1218 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1219 oop mirror = JNIHandles::resolve_non_null(cls);
1220 if (java_lang_Class::is_primitive(mirror)) {
1221 return JNI_FALSE;
1222 }
1223 Klass* k = java_lang_Class::as_Klass(mirror);
1224 return k->is_hidden();
1225 JVM_END
1226
1227 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1228 JvmtiVMObjectAllocEventCollector oam;
1229 oop mirror = JNIHandles::resolve_non_null(cls);
1230 if (java_lang_Class::is_primitive(mirror)) {
1231 // There are no signers for primitive types
1232 return nullptr;
1233 }
1234
1235 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1236
1237 // If there are no signers set in the class, or if the class
1238 // is an array, return null.
1239 if (signers == nullptr) return nullptr;
1240
1241 // copy of the signers array
1242 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1243 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1244 for (int index = 0; index < signers->length(); index++) {
1245 signers_copy->obj_at_put(index, signers->obj_at(index));
1246 }
1247
1248 // return the copy
1249 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1250 JVM_END
1251
1252
1253 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1254 oop mirror = JNIHandles::resolve_non_null(cls);
1255 if (!java_lang_Class::is_primitive(mirror)) {
1256 // This call is ignored for primitive types and arrays.
1257 // Signers are only set once, ClassLoader.java, and thus shouldn't
1258 // be called with an array. Only the bootstrap loader creates arrays.
1259 Klass* k = java_lang_Class::as_Klass(mirror);
1260 if (k->is_instance_klass()) {
1261 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1262 }
1263 }
1264 JVM_END
1265
1266
1267 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1268 oop mirror = JNIHandles::resolve_non_null(cls);
1269 if (mirror == nullptr) {
1270 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1271 }
1272
1273 if (java_lang_Class::is_primitive(mirror)) {
1274 // Primitive types does not have a protection domain.
1275 return nullptr;
1276 }
1277
1278 oop pd = java_lang_Class::protection_domain(mirror);
1279 return (jobject) JNIHandles::make_local(THREAD, pd);
1280 JVM_END
1281
1282
1283 // Returns the inherited_access_control_context field of the running thread.
1284 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1285 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1286 return JNIHandles::make_local(THREAD, result);
1287 JVM_END
1288
1289 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1290 if (!UsePrivilegedStack) return nullptr;
1291
1292 ResourceMark rm(THREAD);
1293 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1294 JvmtiVMObjectAllocEventCollector oam;
1295
1296 // count the protection domains on the execution stack. We collapse
1297 // duplicate consecutive protection domains into a single one, as
1298 // well as stopping when we hit a privileged frame.
1299
1300 oop previous_protection_domain = nullptr;
1301 Handle privileged_context(thread, nullptr);
1302 bool is_privileged = false;
1303 oop protection_domain = nullptr;
1304
1305 // Iterate through Java frames
1306 vframeStream vfst(thread);
1307 for(; !vfst.at_end(); vfst.next()) {
1308 // get method of frame
1309 Method* method = vfst.method();
1310
1311 // stop at the first privileged frame
1312 if (method->method_holder() == vmClasses::AccessController_klass() &&
1313 method->name() == vmSymbols::executePrivileged_name())
1314 {
1315 // this frame is privileged
1316 is_privileged = true;
1317
1318 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1319
1320 StackValueCollection* locals = priv->locals();
1321 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1322 StackValue* clr_sv = locals->at(2); // Class<?> caller
1323 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1324 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1325 privileged_context = ctx_sv->get_obj();
1326 Handle caller = clr_sv->get_obj();
1327
1328 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1329 protection_domain = caller_klass->protection_domain();
1330 } else {
1331 protection_domain = method->method_holder()->protection_domain();
1332 }
1333
1334 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1335 local_array->push(Handle(thread, protection_domain));
1336 previous_protection_domain = protection_domain;
1337 }
1338
1339 if (is_privileged) break;
1340 }
1341
1342
1343 // either all the domains on the stack were system domains, or
1344 // we had a privileged system domain
1345 if (local_array->is_empty()) {
1346 if (is_privileged && privileged_context.is_null()) return nullptr;
1347
1348 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1349 return JNIHandles::make_local(THREAD, result);
1350 }
1351
1352 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1353 local_array->length(), CHECK_NULL);
1354 objArrayHandle h_context(thread, context);
1355 for (int index = 0; index < local_array->length(); index++) {
1356 h_context->obj_at_put(index, local_array->at(index)());
1357 }
1358
1359 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1360
1361 return JNIHandles::make_local(THREAD, result);
1362 JVM_END
1363
1364 class ScopedValueBindingsResolver {
1365 public:
1366 InstanceKlass* Carrier_klass;
1367 ScopedValueBindingsResolver(JavaThread* THREAD) {
1368 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1369 Carrier_klass = InstanceKlass::cast(k);
1370 }
1371 };
1372
1373 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1374 ResourceMark rm(THREAD);
1375 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1376 JvmtiVMObjectAllocEventCollector oam;
1377
1378 static ScopedValueBindingsResolver resolver(THREAD);
1379
1380 // Iterate through Java frames
1381 vframeStream vfst(thread);
1382 for(; !vfst.at_end(); vfst.next()) {
1383 int loc = -1;
1384 // get method of frame
1385 Method* method = vfst.method();
1386
1387 Symbol *name = method->name();
1388
1389 InstanceKlass* holder = method->method_holder();
1390 if (name == vmSymbols::runWith_method_name()) {
1391 if (holder == vmClasses::Thread_klass()
1392 || holder == resolver.Carrier_klass) {
1393 loc = 1;
1394 }
1395 }
1396
1397 if (loc != -1) {
1398 javaVFrame *frame = vfst.asJavaVFrame();
1399 StackValueCollection* locals = frame->locals();
1400 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1401 Handle result = head_sv->get_obj();
1402 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1403 if (result() != nullptr) {
1404 return JNIHandles::make_local(THREAD, result());
1405 }
1406 }
1407 }
1408
1409 return nullptr;
1410 JVM_END
1411
1412 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1413 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1414 return (k != nullptr) && k->is_array_klass() ? true : false;
1415 JVM_END
1416
1417
1418 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1419 oop mirror = JNIHandles::resolve_non_null(cls);
1420 return (jboolean) java_lang_Class::is_primitive(mirror);
1421 JVM_END
1422
1423
1424 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1425 oop mirror = JNIHandles::resolve_non_null(cls);
1426 if (java_lang_Class::is_primitive(mirror)) {
1427 // Primitive type
1428 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1429 }
1430
1431 Klass* k = java_lang_Class::as_Klass(mirror);
1432 debug_only(int computed_modifiers = k->compute_modifier_flags());
1433 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1434 return k->modifier_flags();
1435 JVM_END
1436
1437
1438 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1439
1440 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1441 JvmtiVMObjectAllocEventCollector oam;
1442 // ofClass is a reference to a java_lang_Class object. The mirror object
1443 // of an InstanceKlass
1444 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1445 if (java_lang_Class::is_primitive(ofMirror) ||
1446 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1447 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1448 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1449 }
1450
1451 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1452 InnerClassesIterator iter(k);
1453
1454 if (iter.length() == 0) {
1455 // Neither an inner nor outer class
1456 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1457 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1458 }
1459
1460 // find inner class info
1461 constantPoolHandle cp(thread, k->constants());
1462 int length = iter.length();
1463
1464 // Allocate temp. result array
1465 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1466 objArrayHandle result (THREAD, r);
1467 int members = 0;
1468
1469 for (; !iter.done(); iter.next()) {
1470 int ioff = iter.inner_class_info_index();
1471 int ooff = iter.outer_class_info_index();
1472
1473 if (ioff != 0 && ooff != 0) {
1474 // Check to see if the name matches the class we're looking for
1475 // before attempting to find the class.
1476 if (cp->klass_name_at_matches(k, ooff)) {
1477 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1478 if (outer_klass == k) {
1479 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1480 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1481
1482 // Throws an exception if outer klass has not declared k as
1483 // an inner klass
1484 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1485
1486 result->obj_at_put(members, inner_klass->java_mirror());
1487 members++;
1488 }
1489 }
1490 }
1491 }
1492
1493 if (members != length) {
1494 // Return array of right length
1495 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1496 for(int i = 0; i < members; i++) {
1497 res->obj_at_put(i, result->obj_at(i));
1498 }
1499 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1500 }
1501
1502 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1503 JVM_END
1504
1505
1506 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1507 {
1508 // ofClass is a reference to a java_lang_Class object.
1509 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1510 if (java_lang_Class::is_primitive(ofMirror)) {
1511 return nullptr;
1512 }
1513 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1514 if (!klass->is_instance_klass()) {
1515 return nullptr;
1516 }
1517
1518 bool inner_is_member = false;
1519 Klass* outer_klass
1520 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1521 if (outer_klass == nullptr) return nullptr; // already a top-level class
1522 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1523 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1524 }
1525 JVM_END
1526
1527 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1528 {
1529 oop mirror = JNIHandles::resolve_non_null(cls);
1530 if (java_lang_Class::is_primitive(mirror)) {
1531 return nullptr;
1532 }
1533 Klass* klass = java_lang_Class::as_Klass(mirror);
1534 if (!klass->is_instance_klass()) {
1535 return nullptr;
1536 }
1537 InstanceKlass* k = InstanceKlass::cast(klass);
1538 int ooff = 0, noff = 0;
1539 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1540 if (noff != 0) {
1541 constantPoolHandle i_cp(thread, k->constants());
1542 Symbol* name = i_cp->symbol_at(noff);
1543 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1544 return (jstring) JNIHandles::make_local(THREAD, str());
1545 }
1546 }
1547 return nullptr;
1548 }
1549 JVM_END
1550
1551 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1552 assert (cls != nullptr, "illegal class");
1553 JvmtiVMObjectAllocEventCollector oam;
1554 ResourceMark rm(THREAD);
1555 oop mirror = JNIHandles::resolve_non_null(cls);
1556 // Return null for arrays and primitives
1557 if (!java_lang_Class::is_primitive(mirror)) {
1558 Klass* k = java_lang_Class::as_Klass(mirror);
1559 if (k->is_instance_klass()) {
1560 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1561 if (sym == nullptr) return nullptr;
1562 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1563 return (jstring) JNIHandles::make_local(THREAD, str());
1564 }
1565 }
1566 return nullptr;
1567 JVM_END
1568
1569
1570 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1571 assert (cls != nullptr, "illegal class");
1572 oop mirror = JNIHandles::resolve_non_null(cls);
1573 // Return null for arrays and primitives
1574 if (!java_lang_Class::is_primitive(mirror)) {
1575 Klass* k = java_lang_Class::as_Klass(mirror);
1576 if (k->is_instance_klass()) {
1577 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1578 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1579 }
1580 }
1581 return nullptr;
1582 JVM_END
1583
1584
1585 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1586 // some of this code was adapted from from jni_FromReflectedField
1587
1588 oop reflected = JNIHandles::resolve_non_null(field);
1589 oop mirror = java_lang_reflect_Field::clazz(reflected);
1590 Klass* k = java_lang_Class::as_Klass(mirror);
1591 int slot = java_lang_reflect_Field::slot(reflected);
1592 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1593
1594 InstanceKlass* ik = InstanceKlass::cast(k);
1595 intptr_t offset = ik->field_offset(slot);
1596
1597 if (modifiers & JVM_ACC_STATIC) {
1598 // for static fields we only look in the current class
1599 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1600 assert(false, "cannot find static field");
1601 return false;
1602 }
1603 } else {
1604 // for instance fields we start with the current class and work
1605 // our way up through the superclass chain
1606 if (!ik->find_field_from_offset(offset, false, &fd)) {
1607 assert(false, "cannot find instance field");
1608 return false;
1609 }
1610 }
1611 return true;
1612 }
1613
1614 static Method* jvm_get_method_common(jobject method) {
1615 // some of this code was adapted from from jni_FromReflectedMethod
1616
1617 oop reflected = JNIHandles::resolve_non_null(method);
1618 oop mirror = nullptr;
1619 int slot = 0;
1620
1621 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1622 mirror = java_lang_reflect_Constructor::clazz(reflected);
1623 slot = java_lang_reflect_Constructor::slot(reflected);
1624 } else {
1625 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1626 "wrong type");
1627 mirror = java_lang_reflect_Method::clazz(reflected);
1628 slot = java_lang_reflect_Method::slot(reflected);
1629 }
1630 Klass* k = java_lang_Class::as_Klass(mirror);
1631
1632 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1633 assert(m != nullptr, "cannot find method");
1634 return m; // caller has to deal with null in product mode
1635 }
1636
1637 /* Type use annotations support (JDK 1.8) */
1638
1639 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1640 assert (cls != nullptr, "illegal class");
1641 ResourceMark rm(THREAD);
1642 // Return null for arrays and primitives
1643 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1644 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1645 if (k->is_instance_klass()) {
1646 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1647 if (type_annotations != nullptr) {
1648 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1649 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1650 }
1651 }
1652 }
1653 return nullptr;
1654 JVM_END
1655
1656 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1657 assert (method != nullptr, "illegal method");
1658 // method is a handle to a java.lang.reflect.Method object
1659 Method* m = jvm_get_method_common(method);
1660 if (m == nullptr) {
1661 return nullptr;
1662 }
1663
1664 AnnotationArray* type_annotations = m->type_annotations();
1665 if (type_annotations != nullptr) {
1666 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1667 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1668 }
1669
1670 return nullptr;
1671 JVM_END
1672
1673 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1674 assert (field != nullptr, "illegal field");
1675 fieldDescriptor fd;
1676 bool gotFd = jvm_get_field_common(field, fd);
1677 if (!gotFd) {
1678 return nullptr;
1679 }
1680
1681 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1682 JVM_END
1683
1684 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1685 if (!cp->is_within_bounds(index)) {
1686 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1687 }
1688 }
1689
1690 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1691 {
1692 // method is a handle to a java.lang.reflect.Method object
1693 Method* method_ptr = jvm_get_method_common(method);
1694 methodHandle mh (THREAD, method_ptr);
1695 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1696 const int num_params = mh->method_parameters_length();
1697
1698 if (num_params < 0) {
1699 // A -1 return value from method_parameters_length means there is no
1700 // parameter data. Return null to indicate this to the reflection
1701 // API.
1702 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1703 return (jobjectArray)nullptr;
1704 } else {
1705 // Otherwise, we return something up to reflection, even if it is
1706 // a zero-length array. Why? Because in some cases this can
1707 // trigger a MalformedParametersException.
1708
1709 // make sure all the symbols are properly formatted
1710 for (int i = 0; i < num_params; i++) {
1711 MethodParametersElement* params = mh->method_parameters_start();
1712 int index = params[i].name_cp_index;
1713 constantPoolHandle cp(THREAD, mh->constants());
1714 bounds_check(cp, index, CHECK_NULL);
1715
1716 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1717 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1718 "Wrong type at constant pool index");
1719 }
1720
1721 }
1722
1723 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1724 objArrayHandle result (THREAD, result_oop);
1725
1726 for (int i = 0; i < num_params; i++) {
1727 MethodParametersElement* params = mh->method_parameters_start();
1728 // For a 0 index, give a null symbol
1729 Symbol* sym = 0 != params[i].name_cp_index ?
1730 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1731 int flags = params[i].flags;
1732 oop param = Reflection::new_parameter(reflected_method, i, sym,
1733 flags, CHECK_NULL);
1734 result->obj_at_put(i, param);
1735 }
1736 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1737 }
1738 }
1739 JVM_END
1740
1741 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1742
1743 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1744 {
1745 JvmtiVMObjectAllocEventCollector oam;
1746
1747 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1748 // Exclude primitive types and array types
1749 if (java_lang_Class::is_primitive(ofMirror) ||
1750 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1751 // Return empty array
1752 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1753 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1754 }
1755
1756 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1757 constantPoolHandle cp(THREAD, k->constants());
1758
1759 // Ensure class is linked
1760 k->link_class(CHECK_NULL);
1761
1762 // Allocate result
1763 int num_fields;
1764
1765 if (publicOnly) {
1766 num_fields = 0;
1767 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1768 if (fs.access_flags().is_public()) ++num_fields;
1769 }
1770 } else {
1771 num_fields = k->java_fields_count();
1772 }
1773
1774 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1775 objArrayHandle result (THREAD, r);
1776
1777 int out_idx = 0;
1778 fieldDescriptor fd;
1779 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1780 if (!publicOnly || fs.access_flags().is_public()) {
1781 fd.reinitialize(k, fs.index());
1782 oop field = Reflection::new_field(&fd, CHECK_NULL);
1783 result->obj_at_put(out_idx, field);
1784 ++out_idx;
1785 }
1786 }
1787 assert(out_idx == num_fields, "just checking");
1788 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1789 }
1790 JVM_END
1791
1792 // A class is a record if and only if it is final and a direct subclass of
1793 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1794 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1795 {
1796 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1797 if (k != nullptr && k->is_instance_klass()) {
1798 InstanceKlass* ik = InstanceKlass::cast(k);
1799 return ik->is_record();
1800 } else {
1801 return false;
1802 }
1803 }
1804 JVM_END
1805
1806 // Returns an array containing the components of the Record attribute,
1807 // or null if the attribute is not present.
1808 //
1809 // Note that this function returns the components of the Record attribute
1810 // even if the class is not a record.
1811 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1812 {
1813 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1814 assert(c->is_instance_klass(), "must be");
1815 InstanceKlass* ik = InstanceKlass::cast(c);
1816
1817 Array<RecordComponent*>* components = ik->record_components();
1818 if (components != nullptr) {
1819 JvmtiVMObjectAllocEventCollector oam;
1820 constantPoolHandle cp(THREAD, ik->constants());
1821 int length = components->length();
1822 assert(length >= 0, "unexpected record_components length");
1823 objArrayOop record_components =
1824 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1825 objArrayHandle components_h (THREAD, record_components);
1826
1827 for (int x = 0; x < length; x++) {
1828 RecordComponent* component = components->at(x);
1829 assert(component != nullptr, "unexpected null record component");
1830 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1831 components_h->obj_at_put(x, component_oop);
1832 }
1833 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1834 }
1835
1836 return nullptr;
1837 }
1838 JVM_END
1839
1840 static bool select_method(const methodHandle& method, bool want_constructor) {
1841 if (want_constructor) {
1842 return (method->is_initializer() && !method->is_static());
1843 } else {
1844 return (!method->is_initializer() && !method->is_overpass());
1845 }
1846 }
1847
1848 static jobjectArray get_class_declared_methods_helper(
1849 JNIEnv *env,
1850 jclass ofClass, jboolean publicOnly,
1851 bool want_constructor,
1852 Klass* klass, TRAPS) {
1853
1854 JvmtiVMObjectAllocEventCollector oam;
1855
1856 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1857 // Exclude primitive types and array types
1858 if (java_lang_Class::is_primitive(ofMirror)
1859 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1860 // Return empty array
1861 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1862 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1863 }
1864
1865 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1866
1867 // Ensure class is linked
1868 k->link_class(CHECK_NULL);
1869
1870 Array<Method*>* methods = k->methods();
1871 int methods_length = methods->length();
1872
1873 // Save original method_idnum in case of redefinition, which can change
1874 // the idnum of obsolete methods. The new method will have the same idnum
1875 // but if we refresh the methods array, the counts will be wrong.
1876 ResourceMark rm(THREAD);
1877 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1878 int num_methods = 0;
1879
1880 for (int i = 0; i < methods_length; i++) {
1881 methodHandle method(THREAD, methods->at(i));
1882 if (select_method(method, want_constructor)) {
1883 if (!publicOnly || method->is_public()) {
1884 idnums->push(method->method_idnum());
1885 ++num_methods;
1886 }
1887 }
1888 }
1889
1890 // Allocate result
1891 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1892 objArrayHandle result (THREAD, r);
1893
1894 // Now just put the methods that we selected above, but go by their idnum
1895 // in case of redefinition. The methods can be redefined at any safepoint,
1896 // so above when allocating the oop array and below when creating reflect
1897 // objects.
1898 for (int i = 0; i < num_methods; i++) {
1899 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1900 if (method.is_null()) {
1901 // Method may have been deleted and seems this API can handle null
1902 // Otherwise should probably put a method that throws NSME
1903 result->obj_at_put(i, nullptr);
1904 } else {
1905 oop m;
1906 if (want_constructor) {
1907 m = Reflection::new_constructor(method, CHECK_NULL);
1908 } else {
1909 m = Reflection::new_method(method, false, CHECK_NULL);
1910 }
1911 result->obj_at_put(i, m);
1912 }
1913 }
1914
1915 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1916 }
1917
1918 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1919 {
1920 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1921 /*want_constructor*/ false,
1922 vmClasses::reflect_Method_klass(), THREAD);
1923 }
1924 JVM_END
1925
1926 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1927 {
1928 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1929 /*want_constructor*/ true,
1930 vmClasses::reflect_Constructor_klass(), THREAD);
1931 }
1932 JVM_END
1933
1934 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1935 {
1936 oop mirror = JNIHandles::resolve_non_null(cls);
1937 if (java_lang_Class::is_primitive(mirror)) {
1938 // Primitive type
1939 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1940 }
1941
1942 Klass* k = java_lang_Class::as_Klass(mirror);
1943 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1944 }
1945 JVM_END
1946
1947 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1948 {
1949 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1950 assert(c->is_instance_klass(), "must be");
1951 InstanceKlass* ck = InstanceKlass::cast(c);
1952 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1953 assert(m->is_instance_klass(), "must be");
1954 InstanceKlass* mk = InstanceKlass::cast(m);
1955 return ck->has_nestmate_access_to(mk, THREAD);
1956 }
1957 JVM_END
1958
1959 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1960 {
1961 // current is not a primitive or array class
1962 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1963 assert(c->is_instance_klass(), "must be");
1964 InstanceKlass* ck = InstanceKlass::cast(c);
1965 InstanceKlass* host = ck->nest_host(THREAD);
1966 return (jclass) (host == nullptr ? nullptr :
1967 JNIHandles::make_local(THREAD, host->java_mirror()));
1968 }
1969 JVM_END
1970
1971 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1972 {
1973 // current is not a primitive or array class
1974 ResourceMark rm(THREAD);
1975 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1976 assert(c->is_instance_klass(), "must be");
1977 InstanceKlass* ck = InstanceKlass::cast(c);
1978 InstanceKlass* host = ck->nest_host(THREAD);
1979
1980 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1981 ck->external_name(), host->external_name());
1982 {
1983 JvmtiVMObjectAllocEventCollector oam;
1984 Array<u2>* members = host->nest_members();
1985 int length = members == nullptr ? 0 : members->length();
1986
1987 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1988
1989 // nest host is first in the array so make it one bigger
1990 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1991 length + 1, CHECK_NULL);
1992 objArrayHandle result(THREAD, r);
1993 result->obj_at_put(0, host->java_mirror());
1994 if (length != 0) {
1995 int count = 0;
1996 for (int i = 0; i < length; i++) {
1997 int cp_index = members->at(i);
1998 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1999 if (HAS_PENDING_EXCEPTION) {
2000 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2001 return nullptr; // propagate VMEs
2002 }
2003 if (log_is_enabled(Trace, class, nestmates)) {
2004 stringStream ss;
2005 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2006 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2007 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2008 log_trace(class, nestmates)("%s", ss.as_string());
2009 }
2010 CLEAR_PENDING_EXCEPTION;
2011 continue;
2012 }
2013 if (k->is_instance_klass()) {
2014 InstanceKlass* ik = InstanceKlass::cast(k);
2015 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2016 if (nest_host_k == host) {
2017 result->obj_at_put(count+1, k->java_mirror());
2018 count++;
2019 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2020 } else {
2021 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2022 ik->external_name(), nest_host_k->external_name());
2023 }
2024 } else {
2025 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2026 k->external_name());
2027 }
2028 }
2029 if (count < length) {
2030 // we had invalid entries so we need to compact the array
2031 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2032 length + 1, count + 1);
2033
2034 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2035 count + 1, CHECK_NULL);
2036 objArrayHandle result2(THREAD, r2);
2037 for (int i = 0; i < count + 1; i++) {
2038 result2->obj_at_put(i, result->obj_at(i));
2039 }
2040 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2041 }
2042 }
2043 else {
2044 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2045 }
2046 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2047 }
2048 }
2049 JVM_END
2050
2051 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2052 {
2053 oop mirror = JNIHandles::resolve_non_null(current);
2054 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2055 Klass* c = java_lang_Class::as_Klass(mirror);
2056 assert(c->is_instance_klass(), "must be");
2057 InstanceKlass* ik = InstanceKlass::cast(c);
2058 ResourceMark rm(THREAD);
2059 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2060 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2061 if (ik->is_sealed()) {
2062 JvmtiVMObjectAllocEventCollector oam;
2063 Array<u2>* subclasses = ik->permitted_subclasses();
2064 int length = subclasses->length();
2065
2066 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2067
2068 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2069 length, CHECK_NULL);
2070 objArrayHandle result(THREAD, r);
2071 int count = 0;
2072 for (int i = 0; i < length; i++) {
2073 int cp_index = subclasses->at(i);
2074 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2075 if (HAS_PENDING_EXCEPTION) {
2076 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2077 return nullptr; // propagate VMEs
2078 }
2079 if (log_is_enabled(Trace, class, sealed)) {
2080 stringStream ss;
2081 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2082 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2083 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2084 log_trace(class, sealed)("%s", ss.as_string());
2085 }
2086
2087 CLEAR_PENDING_EXCEPTION;
2088 continue;
2089 }
2090 if (k->is_instance_klass()) {
2091 result->obj_at_put(count++, k->java_mirror());
2092 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2093 }
2094 }
2095 if (count < length) {
2096 // we had invalid entries so we need to compact the array
2097 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2098 count, CHECK_NULL);
2099 objArrayHandle result2(THREAD, r2);
2100 for (int i = 0; i < count; i++) {
2101 result2->obj_at_put(i, result->obj_at(i));
2102 }
2103 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2104 }
2105 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2106 } else {
2107 return nullptr;
2108 }
2109 }
2110 JVM_END
2111
2112 // Constant pool access //////////////////////////////////////////////////////////
2113
2114 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2115 {
2116 JvmtiVMObjectAllocEventCollector oam;
2117 oop mirror = JNIHandles::resolve_non_null(cls);
2118 // Return null for primitives and arrays
2119 if (!java_lang_Class::is_primitive(mirror)) {
2120 Klass* k = java_lang_Class::as_Klass(mirror);
2121 if (k->is_instance_klass()) {
2122 InstanceKlass* k_h = InstanceKlass::cast(k);
2123 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2124 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2125 return JNIHandles::make_local(THREAD, jcp());
2126 }
2127 }
2128 return nullptr;
2129 }
2130 JVM_END
2131
2132
2133 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2134 {
2135 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2136 return cp->length();
2137 }
2138 JVM_END
2139
2140
2141 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2142 {
2143 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2144 bounds_check(cp, index, CHECK_NULL);
2145 constantTag tag = cp->tag_at(index);
2146 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2147 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2148 }
2149 Klass* k = cp->klass_at(index, CHECK_NULL);
2150 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2151 }
2152 JVM_END
2153
2154 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2155 {
2156 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2157 bounds_check(cp, index, CHECK_NULL);
2158 constantTag tag = cp->tag_at(index);
2159 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2160 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2161 }
2162 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2163 if (k == nullptr) return nullptr;
2164 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2165 }
2166 JVM_END
2167
2168 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2169 constantTag tag = cp->tag_at(index);
2170 if (!tag.is_method() && !tag.is_interface_method()) {
2171 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2172 }
2173 int klass_ref = cp->uncached_klass_ref_index_at(index);
2174 Klass* k_o;
2175 if (force_resolution) {
2176 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2177 } else {
2178 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2179 if (k_o == nullptr) return nullptr;
2180 }
2181 InstanceKlass* k = InstanceKlass::cast(k_o);
2182 Symbol* name = cp->uncached_name_ref_at(index);
2183 Symbol* sig = cp->uncached_signature_ref_at(index);
2184 methodHandle m (THREAD, k->find_method(name, sig));
2185 if (m.is_null()) {
2186 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2187 }
2188 oop method;
2189 if (!m->is_initializer() || m->is_static()) {
2190 method = Reflection::new_method(m, true, CHECK_NULL);
2191 } else {
2192 method = Reflection::new_constructor(m, CHECK_NULL);
2193 }
2194 return JNIHandles::make_local(THREAD, method);
2195 }
2196
2197 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2198 {
2199 JvmtiVMObjectAllocEventCollector oam;
2200 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2201 bounds_check(cp, index, CHECK_NULL);
2202 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2203 return res;
2204 }
2205 JVM_END
2206
2207 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2208 {
2209 JvmtiVMObjectAllocEventCollector oam;
2210 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2211 bounds_check(cp, index, CHECK_NULL);
2212 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2213 return res;
2214 }
2215 JVM_END
2216
2217 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2218 constantTag tag = cp->tag_at(index);
2219 if (!tag.is_field()) {
2220 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2221 }
2222 int klass_ref = cp->uncached_klass_ref_index_at(index);
2223 Klass* k_o;
2224 if (force_resolution) {
2225 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2226 } else {
2227 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2228 if (k_o == nullptr) return nullptr;
2229 }
2230 InstanceKlass* k = InstanceKlass::cast(k_o);
2231 Symbol* name = cp->uncached_name_ref_at(index);
2232 Symbol* sig = cp->uncached_signature_ref_at(index);
2233 fieldDescriptor fd;
2234 Klass* target_klass = k->find_field(name, sig, &fd);
2235 if (target_klass == nullptr) {
2236 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2237 }
2238 oop field = Reflection::new_field(&fd, CHECK_NULL);
2239 return JNIHandles::make_local(THREAD, field);
2240 }
2241
2242 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2243 {
2244 JvmtiVMObjectAllocEventCollector oam;
2245 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2246 bounds_check(cp, index, CHECK_NULL);
2247 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2248 return res;
2249 }
2250 JVM_END
2251
2252 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2253 {
2254 JvmtiVMObjectAllocEventCollector oam;
2255 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2256 bounds_check(cp, index, CHECK_NULL);
2257 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2258 return res;
2259 }
2260 JVM_END
2261
2262 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2263 {
2264 JvmtiVMObjectAllocEventCollector oam;
2265 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2266 bounds_check(cp, index, CHECK_NULL);
2267 constantTag tag = cp->tag_at(index);
2268 if (!tag.is_field_or_method()) {
2269 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2270 }
2271 int klass_ref = cp->uncached_klass_ref_index_at(index);
2272 Symbol* klass_name = cp->klass_name_at(klass_ref);
2273 Symbol* member_name = cp->uncached_name_ref_at(index);
2274 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2275 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2276 objArrayHandle dest(THREAD, dest_o);
2277 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2278 dest->obj_at_put(0, str());
2279 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2280 dest->obj_at_put(1, str());
2281 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2282 dest->obj_at_put(2, str());
2283 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2284 }
2285 JVM_END
2286
2287 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2288 {
2289 JvmtiVMObjectAllocEventCollector oam;
2290 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2291 bounds_check(cp, index, CHECK_0);
2292 constantTag tag = cp->tag_at(index);
2293 if (!tag.is_field_or_method()) {
2294 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2295 }
2296 return (jint) cp->uncached_klass_ref_index_at(index);
2297 }
2298 JVM_END
2299
2300 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2301 {
2302 JvmtiVMObjectAllocEventCollector oam;
2303 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2304 bounds_check(cp, index, CHECK_0);
2305 constantTag tag = cp->tag_at(index);
2306 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2307 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2308 }
2309 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2310 }
2311 JVM_END
2312
2313 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2314 {
2315 JvmtiVMObjectAllocEventCollector oam;
2316 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2317 bounds_check(cp, index, CHECK_NULL);
2318 constantTag tag = cp->tag_at(index);
2319 if (!tag.is_name_and_type()) {
2320 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2321 }
2322 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2323 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2324 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2325 objArrayHandle dest(THREAD, dest_o);
2326 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2327 dest->obj_at_put(0, str());
2328 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2329 dest->obj_at_put(1, str());
2330 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2331 }
2332 JVM_END
2333
2334 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2335 {
2336 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2337 bounds_check(cp, index, CHECK_0);
2338 constantTag tag = cp->tag_at(index);
2339 if (!tag.is_int()) {
2340 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2341 }
2342 return cp->int_at(index);
2343 }
2344 JVM_END
2345
2346 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2347 {
2348 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2349 bounds_check(cp, index, CHECK_(0L));
2350 constantTag tag = cp->tag_at(index);
2351 if (!tag.is_long()) {
2352 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2353 }
2354 return cp->long_at(index);
2355 }
2356 JVM_END
2357
2358 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2359 {
2360 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2361 bounds_check(cp, index, CHECK_(0.0f));
2362 constantTag tag = cp->tag_at(index);
2363 if (!tag.is_float()) {
2364 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2365 }
2366 return cp->float_at(index);
2367 }
2368 JVM_END
2369
2370 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2371 {
2372 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2373 bounds_check(cp, index, CHECK_(0.0));
2374 constantTag tag = cp->tag_at(index);
2375 if (!tag.is_double()) {
2376 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2377 }
2378 return cp->double_at(index);
2379 }
2380 JVM_END
2381
2382 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2383 {
2384 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2385 bounds_check(cp, index, CHECK_NULL);
2386 constantTag tag = cp->tag_at(index);
2387 if (!tag.is_string()) {
2388 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2389 }
2390 oop str = cp->string_at(index, CHECK_NULL);
2391 return (jstring) JNIHandles::make_local(THREAD, str);
2392 }
2393 JVM_END
2394
2395 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2396 {
2397 JvmtiVMObjectAllocEventCollector oam;
2398 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2399 bounds_check(cp, index, CHECK_NULL);
2400 constantTag tag = cp->tag_at(index);
2401 if (!tag.is_symbol()) {
2402 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2403 }
2404 Symbol* sym = cp->symbol_at(index);
2405 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2406 return (jstring) JNIHandles::make_local(THREAD, str());
2407 }
2408 JVM_END
2409
2410 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2411 {
2412 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2413 bounds_check(cp, index, CHECK_0);
2414 constantTag tag = cp->tag_at(index);
2415 jbyte result = tag.value();
2416 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2417 // they are changed to the corresponding tags from the JVM spec, so that java code in
2418 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2419 if (tag.is_klass_or_reference()) {
2420 result = JVM_CONSTANT_Class;
2421 } else if (tag.is_string_index()) {
2422 result = JVM_CONSTANT_String;
2423 } else if (tag.is_method_type_in_error()) {
2424 result = JVM_CONSTANT_MethodType;
2425 } else if (tag.is_method_handle_in_error()) {
2426 result = JVM_CONSTANT_MethodHandle;
2427 } else if (tag.is_dynamic_constant_in_error()) {
2428 result = JVM_CONSTANT_Dynamic;
2429 }
2430 return result;
2431 }
2432 JVM_END
2433
2434 // Assertion support. //////////////////////////////////////////////////////////
2435
2436 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2437 assert(cls != nullptr, "bad class");
2438
2439 oop r = JNIHandles::resolve(cls);
2440 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2441 if (java_lang_Class::is_primitive(r)) return false;
2442
2443 Klass* k = java_lang_Class::as_Klass(r);
2444 assert(k->is_instance_klass(), "must be an instance klass");
2445 if (!k->is_instance_klass()) return false;
2446
2447 ResourceMark rm(THREAD);
2448 const char* name = k->name()->as_C_string();
2449 bool system_class = k->class_loader() == nullptr;
2450 return JavaAssertions::enabled(name, system_class);
2451
2452 JVM_END
2453
2454
2455 // Return a new AssertionStatusDirectives object with the fields filled in with
2456 // command-line assertion arguments (i.e., -ea, -da).
2457 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2458 JvmtiVMObjectAllocEventCollector oam;
2459 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2460 return JNIHandles::make_local(THREAD, asd);
2461 JVM_END
2462
2463 // Verification ////////////////////////////////////////////////////////////////////////////////
2464
2465 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2466
2467 // RedefineClasses support: bug 6214132 caused verification to fail.
2468 // All functions from this section should call the jvmtiThreadSate function:
2469 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2470 // The function returns a Klass* of the _scratch_class if the verifier
2471 // was invoked in the middle of the class redefinition.
2472 // Otherwise it returns its argument value which is the _the_class Klass*.
2473 // Please, refer to the description in the jvmtiThreadSate.hpp.
2474
2475 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2476 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2477 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2478 return k->name()->as_utf8();
2479 JVM_END
2480
2481
2482 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2483 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2484 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2485 // types will have length zero if this is not an InstanceKlass
2486 // (length is determined by call to JVM_GetClassCPEntriesCount)
2487 if (k->is_instance_klass()) {
2488 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2489 for (int index = cp->length() - 1; index >= 0; index--) {
2490 constantTag tag = cp->tag_at(index);
2491 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2492 }
2493 }
2494 JVM_END
2495
2496
2497 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2498 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2499 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2500 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2501 JVM_END
2502
2503
2504 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2505 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2506 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2507 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2508 JVM_END
2509
2510
2511 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2512 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2513 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2514 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2515 JVM_END
2516
2517
2518 // The following methods, used for the verifier, are never called with
2519 // array klasses, so a direct cast to InstanceKlass is safe.
2520 // Typically, these methods are called in a loop with bounds determined
2521 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2522 // zero for arrays.
2523 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2524 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2525 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2526 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2527 int length = method->checked_exceptions_length();
2528 if (length > 0) {
2529 CheckedExceptionElement* table= method->checked_exceptions_start();
2530 for (int i = 0; i < length; i++) {
2531 exceptions[i] = table[i].class_cp_index;
2532 }
2533 }
2534 JVM_END
2535
2536
2537 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2538 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2539 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2540 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2541 return method->checked_exceptions_length();
2542 JVM_END
2543
2544
2545 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2547 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2548 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2549 memcpy(code, method->code_base(), method->code_size());
2550 JVM_END
2551
2552
2553 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2556 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2557 return method->code_size();
2558 JVM_END
2559
2560
2561 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2564 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2565 ExceptionTable extable(method);
2566 entry->start_pc = extable.start_pc(entry_index);
2567 entry->end_pc = extable.end_pc(entry_index);
2568 entry->handler_pc = extable.handler_pc(entry_index);
2569 entry->catchType = extable.catch_type_index(entry_index);
2570 JVM_END
2571
2572
2573 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2574 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2575 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2576 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2577 return method->exception_table_length();
2578 JVM_END
2579
2580
2581 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2583 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2584 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2585 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2586 JVM_END
2587
2588
2589 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2590 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2591 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2592 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2593 JVM_END
2594
2595
2596 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2600 return method->max_locals();
2601 JVM_END
2602
2603
2604 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2605 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2606 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2607 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2608 return method->size_of_parameters();
2609 JVM_END
2610
2611
2612 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2613 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2614 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2615 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2616 return method->verifier_max_stack();
2617 JVM_END
2618
2619
2620 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2621 ResourceMark rm(THREAD);
2622 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2623 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2624 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2625 return method->name() == vmSymbols::object_initializer_name();
2626 JVM_END
2627
2628
2629 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2630 ResourceMark rm(THREAD);
2631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2632 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2633 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2634 return method->is_overpass();
2635 JVM_END
2636
2637 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2638 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2640 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2641 return method->name()->as_utf8();
2642 JVM_END
2643
2644
2645 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2647 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2648 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2649 return method->signature()->as_utf8();
2650 JVM_END
2651
2652 /**
2653 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2654 * read entries in the constant pool. Since the old verifier always
2655 * works on a copy of the code, it will not see any rewriting that
2656 * may possibly occur in the middle of verification. So it is important
2657 * that nothing it calls tries to use the cpCache instead of the raw
2658 * constant pool, so we must use cp->uncached_x methods when appropriate.
2659 */
2660 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2661 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2662 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2663 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2664 switch (cp->tag_at(cp_index).value()) {
2665 case JVM_CONSTANT_Fieldref:
2666 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2667 default:
2668 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2669 }
2670 ShouldNotReachHere();
2671 return nullptr;
2672 JVM_END
2673
2674
2675 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2676 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2677 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2678 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2679 switch (cp->tag_at(cp_index).value()) {
2680 case JVM_CONSTANT_InterfaceMethodref:
2681 case JVM_CONSTANT_Methodref:
2682 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2683 default:
2684 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2685 }
2686 ShouldNotReachHere();
2687 return nullptr;
2688 JVM_END
2689
2690
2691 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2692 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2693 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2694 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2695 switch (cp->tag_at(cp_index).value()) {
2696 case JVM_CONSTANT_InterfaceMethodref:
2697 case JVM_CONSTANT_Methodref:
2698 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2699 default:
2700 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2701 }
2702 ShouldNotReachHere();
2703 return nullptr;
2704 JVM_END
2705
2706
2707 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2708 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2709 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2710 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2711 switch (cp->tag_at(cp_index).value()) {
2712 case JVM_CONSTANT_Fieldref:
2713 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2714 default:
2715 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2716 }
2717 ShouldNotReachHere();
2718 return nullptr;
2719 JVM_END
2720
2721
2722 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2724 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2725 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2726 Symbol* classname = cp->klass_name_at(cp_index);
2727 return classname->as_utf8();
2728 JVM_END
2729
2730
2731 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2732 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2733 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2734 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2735 switch (cp->tag_at(cp_index).value()) {
2736 case JVM_CONSTANT_Fieldref: {
2737 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2738 Symbol* classname = cp->klass_name_at(class_index);
2739 return classname->as_utf8();
2740 }
2741 default:
2742 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2743 }
2744 ShouldNotReachHere();
2745 return nullptr;
2746 JVM_END
2747
2748
2749 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2750 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2751 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2752 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2753 switch (cp->tag_at(cp_index).value()) {
2754 case JVM_CONSTANT_Methodref:
2755 case JVM_CONSTANT_InterfaceMethodref: {
2756 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2757 Symbol* classname = cp->klass_name_at(class_index);
2758 return classname->as_utf8();
2759 }
2760 default:
2761 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2762 }
2763 ShouldNotReachHere();
2764 return nullptr;
2765 JVM_END
2766
2767
2768 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2769 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2770 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2771 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2772 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2773 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2774 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2775 switch (cp->tag_at(cp_index).value()) {
2776 case JVM_CONSTANT_Fieldref: {
2777 Symbol* name = cp->uncached_name_ref_at(cp_index);
2778 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2779 InstanceKlass* ik = InstanceKlass::cast(k_called);
2780 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2781 if (fs.name() == name && fs.signature() == signature) {
2782 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2783 }
2784 }
2785 return -1;
2786 }
2787 default:
2788 fatal("JVM_GetCPFieldModifiers: illegal constant");
2789 }
2790 ShouldNotReachHere();
2791 return 0;
2792 JVM_END
2793
2794
2795 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2796 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2797 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2798 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2799 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2800 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2801 switch (cp->tag_at(cp_index).value()) {
2802 case JVM_CONSTANT_Methodref:
2803 case JVM_CONSTANT_InterfaceMethodref: {
2804 Symbol* name = cp->uncached_name_ref_at(cp_index);
2805 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2806 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2807 int methods_count = methods->length();
2808 for (int i = 0; i < methods_count; i++) {
2809 Method* method = methods->at(i);
2810 if (method->name() == name && method->signature() == signature) {
2811 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2812 }
2813 }
2814 return -1;
2815 }
2816 default:
2817 fatal("JVM_GetCPMethodModifiers: illegal constant");
2818 }
2819 ShouldNotReachHere();
2820 return 0;
2821 JVM_END
2822
2823
2824 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2825
2826 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2827 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2828 JVM_END
2829
2830
2831 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2832 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2833 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2834 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2835 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2836 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2837 JVM_END
2838
2839 // Printing support //////////////////////////////////////////////////
2840 extern "C" {
2841
2842 ATTRIBUTE_PRINTF(3, 0)
2843 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2844 // Reject count values that are negative signed values converted to
2845 // unsigned; see bug 4399518, 4417214
2846 if ((intptr_t)count <= 0) return -1;
2847
2848 int result = os::vsnprintf(str, count, fmt, args);
2849 if (result > 0 && (size_t)result >= count) {
2850 result = -1;
2851 }
2852
2853 return result;
2854 }
2855
2856 ATTRIBUTE_PRINTF(3, 4)
2857 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2858 va_list args;
2859 int len;
2860 va_start(args, fmt);
2861 len = jio_vsnprintf(str, count, fmt, args);
2862 va_end(args);
2863 return len;
2864 }
2865
2866 ATTRIBUTE_PRINTF(2, 3)
2867 int jio_fprintf(FILE* f, const char *fmt, ...) {
2868 int len;
2869 va_list args;
2870 va_start(args, fmt);
2871 len = jio_vfprintf(f, fmt, args);
2872 va_end(args);
2873 return len;
2874 }
2875
2876 ATTRIBUTE_PRINTF(2, 0)
2877 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2878 if (Arguments::vfprintf_hook() != nullptr) {
2879 return Arguments::vfprintf_hook()(f, fmt, args);
2880 } else {
2881 return vfprintf(f, fmt, args);
2882 }
2883 }
2884
2885 ATTRIBUTE_PRINTF(1, 2)
2886 JNIEXPORT int jio_printf(const char *fmt, ...) {
2887 int len;
2888 va_list args;
2889 va_start(args, fmt);
2890 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2891 va_end(args);
2892 return len;
2893 }
2894
2895 // HotSpot specific jio method
2896 void jio_print(const char* s, size_t len) {
2897 // Try to make this function as atomic as possible.
2898 if (Arguments::vfprintf_hook() != nullptr) {
2899 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2900 } else {
2901 // Make an unused local variable to avoid warning from gcc compiler.
2902 bool dummy = os::write(defaultStream::output_fd(), s, len);
2903 }
2904 }
2905
2906 } // Extern C
2907
2908 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2909
2910 // In most of the JVM thread support functions we need to access the
2911 // thread through a ThreadsListHandle to prevent it from exiting and
2912 // being reclaimed while we try to operate on it. The exceptions to this
2913 // rule are when operating on the current thread, or if the monitor of
2914 // the target java.lang.Thread is locked at the Java level - in both
2915 // cases the target cannot exit.
2916
2917 static void thread_entry(JavaThread* thread, TRAPS) {
2918 HandleMark hm(THREAD);
2919 Handle obj(THREAD, thread->threadObj());
2920 JavaValue result(T_VOID);
2921 JavaCalls::call_virtual(&result,
2922 obj,
2923 vmClasses::Thread_klass(),
2924 vmSymbols::run_method_name(),
2925 vmSymbols::void_method_signature(),
2926 THREAD);
2927 }
2928
2929
2930 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2931 #if INCLUDE_CDS
2932 if (DumpSharedSpaces) {
2933 // During java -Xshare:dump, if we allow multiple Java threads to
2934 // execute in parallel, symbols and classes may be loaded in
2935 // random orders which will make the resulting CDS archive
2936 // non-deterministic.
2937 //
2938 // Lucikly, during java -Xshare:dump, it's important to run only
2939 // the code in the main Java thread (which is NOT started here) that
2940 // creates the module graph, etc. It's safe to not start the other
2941 // threads which are launched by class static initializers
2942 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2943 if (log_is_enabled(Info, cds)) {
2944 ResourceMark rm;
2945 oop t = JNIHandles::resolve_non_null(jthread);
2946 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2947 }
2948 return;
2949 }
2950 #endif
2951 JavaThread *native_thread = nullptr;
2952
2953 // We cannot hold the Threads_lock when we throw an exception,
2954 // due to rank ordering issues. Example: we might need to grab the
2955 // Heap_lock while we construct the exception.
2956 bool throw_illegal_thread_state = false;
2957
2958 // We must release the Threads_lock before we can post a jvmti event
2959 // in Thread::start.
2960 {
2961 // Ensure that the C++ Thread and OSThread structures aren't freed before
2962 // we operate.
2963 MutexLocker mu(Threads_lock);
2964
2965 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2966 // re-starting an already started thread, so we should usually find
2967 // that the JavaThread is null. However for a JNI attached thread
2968 // there is a small window between the Thread object being created
2969 // (with its JavaThread set) and the update to its threadStatus, so we
2970 // have to check for this
2971 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2972 throw_illegal_thread_state = true;
2973 } else {
2974 jlong size =
2975 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2976 // Allocate the C++ Thread structure and create the native thread. The
2977 // stack size retrieved from java is 64-bit signed, but the constructor takes
2978 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2979 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2980 // - Avoid passing negative values which would result in really large stacks.
2981 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2982 size_t sz = size > 0 ? (size_t) size : 0;
2983 native_thread = new JavaThread(&thread_entry, sz);
2984
2985 // At this point it may be possible that no osthread was created for the
2986 // JavaThread due to lack of memory. Check for this situation and throw
2987 // an exception if necessary. Eventually we may want to change this so
2988 // that we only grab the lock if the thread was created successfully -
2989 // then we can also do this check and throw the exception in the
2990 // JavaThread constructor.
2991 if (native_thread->osthread() != nullptr) {
2992 // Note: the current thread is not being used within "prepare".
2993 native_thread->prepare(jthread);
2994 }
2995 }
2996 }
2997
2998 if (throw_illegal_thread_state) {
2999 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3000 }
3001
3002 assert(native_thread != nullptr, "Starting null thread?");
3003
3004 if (native_thread->osthread() == nullptr) {
3005 ResourceMark rm(thread);
3006 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3007 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3008 // No one should hold a reference to the 'native_thread'.
3009 native_thread->smr_delete();
3010 if (JvmtiExport::should_post_resource_exhausted()) {
3011 JvmtiExport::post_resource_exhausted(
3012 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3013 os::native_thread_creation_failed_msg());
3014 }
3015 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3016 os::native_thread_creation_failed_msg());
3017 }
3018
3019 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3020
3021 Thread::start(native_thread);
3022
3023 JVM_END
3024
3025
3026 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3027 ThreadsListHandle tlh(thread);
3028 oop java_thread = nullptr;
3029 JavaThread* receiver = nullptr;
3030 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3031 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3032
3033 if (is_alive) {
3034 // jthread refers to a live JavaThread.
3035 Thread::set_priority(receiver, (ThreadPriority)prio);
3036 }
3037 // Implied else: If the JavaThread hasn't started yet, then the
3038 // priority set in the java.lang.Thread object above will be pushed
3039 // down when it does start.
3040 JVM_END
3041
3042
3043 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3044 if (os::dont_yield()) return;
3045 HOTSPOT_THREAD_YIELD();
3046 os::naked_yield();
3047 JVM_END
3048
3049 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3050 if (nanos < 0) {
3051 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3052 }
3053
3054 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3055 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3056 }
3057
3058 // Save current thread state and restore it at the end of this block.
3059 // And set new thread state to SLEEPING.
3060 JavaThreadSleepState jtss(thread);
3061
3062 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3063
3064 if (nanos == 0) {
3065 os::naked_yield();
3066 } else {
3067 ThreadState old_state = thread->osthread()->get_state();
3068 thread->osthread()->set_state(SLEEPING);
3069 if (!thread->sleep_nanos(nanos)) { // interrupted
3070 // An asynchronous exception could have been thrown on
3071 // us while we were sleeping. We do not overwrite those.
3072 if (!HAS_PENDING_EXCEPTION) {
3073 HOTSPOT_THREAD_SLEEP_END(1);
3074
3075 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3076 // to properly restore the thread state. That's likely wrong.
3077 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3078 }
3079 }
3080 thread->osthread()->set_state(old_state);
3081 }
3082 HOTSPOT_THREAD_SLEEP_END(0);
3083 JVM_END
3084
3085 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3086 oop jthread = thread->threadObj();
3087 assert(jthread != nullptr, "no current carrier thread!");
3088 return JNIHandles::make_local(THREAD, jthread);
3089 JVM_END
3090
3091 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3092 oop theThread = thread->vthread();
3093 assert(theThread != (oop)nullptr, "no current thread!");
3094 return JNIHandles::make_local(THREAD, theThread);
3095 JVM_END
3096
3097 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3098 jobject theThread))
3099 oop threadObj = JNIHandles::resolve(theThread);
3100 thread->set_vthread(threadObj);
3101 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3102 JVM_END
3103
3104 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3105 return ThreadIdentifier::unsafe_offset();
3106 JVM_END
3107
3108 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3109 ThreadsListHandle tlh(thread);
3110 JavaThread* receiver = nullptr;
3111 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3112 if (is_alive) {
3113 // jthread refers to a live JavaThread.
3114 receiver->interrupt();
3115 }
3116 JVM_END
3117
3118 // Return true iff the current thread has locked the object passed in
3119
3120 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3121 if (obj == nullptr) {
3122 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3123 }
3124 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3125 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3126 JVM_END
3127
3128 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3129 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3130 return JNIHandles::make_local(THREAD, trace);
3131 JVM_END
3132
3133 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3134 VM_PrintThreads op;
3135 VMThread::execute(&op);
3136 if (JvmtiExport::should_post_data_dump()) {
3137 JvmtiExport::post_data_dump();
3138 }
3139 JVM_END
3140
3141 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3142 // We don't use a ThreadsListHandle here because the current thread
3143 // must be alive.
3144 oop java_thread = JNIHandles::resolve_non_null(jthread);
3145 JavaThread* thr = java_lang_Thread::thread(java_thread);
3146 if (thread == thr && !thr->has_attached_via_jni()) {
3147 // Thread naming is only supported for the current thread and
3148 // we don't set the name of an attached thread to avoid stepping
3149 // on other programs.
3150 ResourceMark rm(thread);
3151 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3152 os::set_native_thread_name(thread_name);
3153 }
3154 JVM_END
3155
3156 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3157 oop theCache = thread->scopedValueCache();
3158 return JNIHandles::make_local(THREAD, theCache);
3159 JVM_END
3160
3161 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3162 jobject theCache))
3163 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3164 thread->set_scopedValueCache(objs);
3165 JVM_END
3166
3167 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3168
3169 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3170 ResourceMark rm(THREAD);
3171 JvmtiVMObjectAllocEventCollector oam;
3172 vframeStream vfst(thread);
3173
3174 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3175 // This must only be called from SecurityManager.getClassContext
3176 Method* m = vfst.method();
3177 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3178 m->name() == vmSymbols::getClassContext_name() &&
3179 m->signature() == vmSymbols::void_class_array_signature())) {
3180 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3181 }
3182 }
3183
3184 // Collect method holders
3185 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3186 for (; !vfst.at_end(); vfst.security_next()) {
3187 Method* m = vfst.method();
3188 // Native frames are not returned
3189 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3190 Klass* holder = m->method_holder();
3191 assert(holder->is_klass(), "just checking");
3192 klass_array->append(holder);
3193 }
3194 }
3195
3196 // Create result array of type [Ljava/lang/Class;
3197 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3198 // Fill in mirrors corresponding to method holders
3199 for (int i = 0; i < klass_array->length(); i++) {
3200 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3201 }
3202
3203 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3204 JVM_END
3205
3206
3207 // java.lang.Package ////////////////////////////////////////////////////////////////
3208
3209
3210 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3211 ResourceMark rm(THREAD);
3212 JvmtiVMObjectAllocEventCollector oam;
3213 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3214 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3215 return (jstring) JNIHandles::make_local(THREAD, result);
3216 JVM_END
3217
3218
3219 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3220 JvmtiVMObjectAllocEventCollector oam;
3221 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3222 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3223 JVM_END
3224
3225
3226 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3227
3228
3229 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3230 MonitorLocker ml(Heap_lock);
3231 oop ref = Universe::reference_pending_list();
3232 if (ref != nullptr) {
3233 Universe::clear_reference_pending_list();
3234 }
3235 return JNIHandles::make_local(THREAD, ref);
3236 JVM_END
3237
3238 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3239 MonitorLocker ml(Heap_lock);
3240 return Universe::has_reference_pending_list();
3241 JVM_END
3242
3243 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3244 MonitorLocker ml(Heap_lock);
3245 while (!Universe::has_reference_pending_list()) {
3246 ml.wait();
3247 }
3248 JVM_END
3249
3250 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3251 oop ref_oop = JNIHandles::resolve_non_null(ref);
3252 // PhantomReference has it's own implementation of refersTo().
3253 // See: JVM_PhantomReferenceRefersTo
3254 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3255 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3256 return referent == JNIHandles::resolve(o);
3257 JVM_END
3258
3259 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3260 oop ref_oop = JNIHandles::resolve_non_null(ref);
3261 // FinalReference has it's own implementation of clear().
3262 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3263 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3264 // If the referent has already been cleared then done.
3265 // However, if the referent is dead but has not yet been cleared by
3266 // concurrent reference processing, it should NOT be cleared here.
3267 // Instead, clearing should be left to the GC. Clearing it here could
3268 // detectably lose an expected notification, which is impossible with
3269 // STW reference processing. The clearing in enqueue() doesn't have
3270 // this problem, since the enqueue covers the notification, but it's not
3271 // worth the effort to handle that case specially.
3272 return;
3273 }
3274 java_lang_ref_Reference::clear_referent(ref_oop);
3275 JVM_END
3276
3277
3278 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3279
3280
3281 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3282 oop ref_oop = JNIHandles::resolve_non_null(ref);
3283 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3284 return referent == JNIHandles::resolve(o);
3285 JVM_END
3286
3287
3288 // ObjectInputStream ///////////////////////////////////////////////////////////////
3289
3290 // Return the first user-defined class loader up the execution stack, or null
3291 // if only code from the bootstrap or platform class loader is on the stack.
3292
3293 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3294 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3295 InstanceKlass* ik = vfst.method()->method_holder();
3296 oop loader = ik->class_loader();
3297 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3298 // Skip reflection related frames
3299 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
3300 return JNIHandles::make_local(THREAD, loader);
3301 }
3302 }
3303 }
3304 return nullptr;
3305 JVM_END
3306
3307
3308 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3309
3310
3311 // resolve array handle and check arguments
3312 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3313 if (arr == nullptr) {
3314 THROW_0(vmSymbols::java_lang_NullPointerException());
3315 }
3316 oop a = JNIHandles::resolve_non_null(arr);
3317 if (!a->is_array()) {
3318 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3319 } else if (type_array_only && !a->is_typeArray()) {
3320 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3321 }
3322 return arrayOop(a);
3323 }
3324
3325
3326 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3327 arrayOop a = check_array(env, arr, false, CHECK_0);
3328 return a->length();
3329 JVM_END
3330
3331
3332 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3333 JvmtiVMObjectAllocEventCollector oam;
3334 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3335 jvalue value;
3336 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3337 oop box = Reflection::box(&value, type, CHECK_NULL);
3338 return JNIHandles::make_local(THREAD, box);
3339 JVM_END
3340
3341
3342 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3343 jvalue value;
3344 value.i = 0; // to initialize value before getting used in CHECK
3345 arrayOop a = check_array(env, arr, true, CHECK_(value));
3346 assert(a->is_typeArray(), "just checking");
3347 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3348 BasicType wide_type = (BasicType) wCode;
3349 if (type != wide_type) {
3350 Reflection::widen(&value, type, wide_type, CHECK_(value));
3351 }
3352 return value;
3353 JVM_END
3354
3355
3356 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3357 arrayOop a = check_array(env, arr, false, CHECK);
3358 oop box = JNIHandles::resolve(val);
3359 jvalue value;
3360 value.i = 0; // to initialize value before getting used in CHECK
3361 BasicType value_type;
3362 if (a->is_objArray()) {
3363 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3364 value_type = Reflection::unbox_for_regular_object(box, &value);
3365 } else {
3366 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3367 }
3368 Reflection::array_set(&value, a, index, value_type, CHECK);
3369 JVM_END
3370
3371
3372 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3373 arrayOop a = check_array(env, arr, true, CHECK);
3374 assert(a->is_typeArray(), "just checking");
3375 BasicType value_type = (BasicType) vCode;
3376 Reflection::array_set(&v, a, index, value_type, CHECK);
3377 JVM_END
3378
3379
3380 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3381 JvmtiVMObjectAllocEventCollector oam;
3382 oop element_mirror = JNIHandles::resolve(eltClass);
3383 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3384 return JNIHandles::make_local(THREAD, result);
3385 JVM_END
3386
3387
3388 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3389 JvmtiVMObjectAllocEventCollector oam;
3390 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3391 oop element_mirror = JNIHandles::resolve(eltClass);
3392 assert(dim_array->is_typeArray(), "just checking");
3393 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3394 return JNIHandles::make_local(THREAD, result);
3395 JVM_END
3396
3397
3398 // Library support ///////////////////////////////////////////////////////////////////////////
3399
3400 JVM_LEAF(void*, JVM_LoadZipLibrary())
3401 ClassLoader::load_zip_library_if_needed();
3402 return ClassLoader::zip_library_handle();
3403 JVM_END
3404
3405 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3406 //%note jvm_ct
3407 char ebuf[1024];
3408 void *load_result;
3409 {
3410 ThreadToNativeFromVM ttnfvm(thread);
3411 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3412 }
3413 if (load_result == nullptr) {
3414 if (throwException) {
3415 char msg[1024];
3416 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3417 // Since 'ebuf' may contain a string encoded using
3418 // platform encoding scheme, we need to pass
3419 // Exceptions::unsafe_to_utf8 to the new_exception method
3420 // as the last argument. See bug 6367357.
3421 Handle h_exception =
3422 Exceptions::new_exception(thread,
3423 vmSymbols::java_lang_UnsatisfiedLinkError(),
3424 msg, Exceptions::unsafe_to_utf8);
3425
3426 THROW_HANDLE_0(h_exception);
3427 } else {
3428 log_info(library)("Failed to load library %s", name);
3429 return load_result;
3430 }
3431 }
3432 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3433 return load_result;
3434 JVM_END
3435
3436
3437 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3438 os::dll_unload(handle);
3439 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3440 JVM_END
3441
3442
3443 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3444 void* find_result = os::dll_lookup(handle, name);
3445 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3446 find_result != nullptr ? "Found" : "Failed to find",
3447 name, p2i(handle));
3448 return find_result;
3449 JVM_END
3450
3451
3452 // JNI version ///////////////////////////////////////////////////////////////////////////////
3453
3454 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3455 return Threads::is_supported_jni_version_including_1_1(version);
3456 JVM_END
3457
3458
3459 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3460 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3461 JVM_END
3462
3463 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3464 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3465 JVM_END
3466
3467 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3468 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3469 JVM_END
3470
3471 // String support ///////////////////////////////////////////////////////////////////////////
3472
3473 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3474 JvmtiVMObjectAllocEventCollector oam;
3475 if (str == nullptr) return nullptr;
3476 oop string = JNIHandles::resolve_non_null(str);
3477 oop result = StringTable::intern(string, CHECK_NULL);
3478 return (jstring) JNIHandles::make_local(THREAD, result);
3479 JVM_END
3480
3481
3482 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3483
3484 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3485 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3486 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3487 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3488 // nature. JavaThreads will be "in native" when using this API from JDK code.
3489
3490
3491 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3492 VM_Exit::block_if_vm_exited();
3493 return new PlatformMutex();
3494 }
3495
3496
3497 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3498 VM_Exit::block_if_vm_exited();
3499 delete ((PlatformMutex*) mon);
3500 }
3501
3502
3503 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3504 VM_Exit::block_if_vm_exited();
3505 ((PlatformMutex*) mon)->lock();
3506 return 0;
3507 }
3508
3509
3510 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3511 VM_Exit::block_if_vm_exited();
3512 ((PlatformMutex*) mon)->unlock();
3513 }
3514
3515
3516 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3517
3518 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3519 Handle loader, Handle protection_domain,
3520 jboolean throwError, TRAPS) {
3521 // Security Note:
3522 // The Java level wrapper will perform the necessary security check allowing
3523 // us to pass the null as the initiating class loader. The VM is responsible for
3524 // the checkPackageAccess relative to the initiating class loader via the
3525 // protection_domain. The protection_domain is passed as null by the java code
3526 // if there is no security manager in 3-arg Class.forName().
3527 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3528
3529 // Check if we should initialize the class
3530 if (init && klass->is_instance_klass()) {
3531 klass->initialize(CHECK_NULL);
3532 }
3533 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3534 }
3535
3536
3537 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3538
3539 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3540 Handle method_handle;
3541 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3542 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3543 Handle receiver(THREAD, JNIHandles::resolve(obj));
3544 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3545 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3546 jobject res = JNIHandles::make_local(THREAD, result);
3547 if (JvmtiExport::should_post_vm_object_alloc()) {
3548 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3549 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3550 if (java_lang_Class::is_primitive(ret_type)) {
3551 // Only for primitive type vm allocates memory for java object.
3552 // See box() method.
3553 JvmtiExport::post_vm_object_alloc(thread, result);
3554 }
3555 }
3556 return res;
3557 } else {
3558 THROW_0(vmSymbols::java_lang_StackOverflowError());
3559 }
3560 JVM_END
3561
3562
3563 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3564 oop constructor_mirror = JNIHandles::resolve(c);
3565 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3566 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3567 jobject res = JNIHandles::make_local(THREAD, result);
3568 if (JvmtiExport::should_post_vm_object_alloc()) {
3569 JvmtiExport::post_vm_object_alloc(thread, result);
3570 }
3571 return res;
3572 JVM_END
3573
3574 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3575
3576 JVM_LEAF(jboolean, JVM_SupportsCX8())
3577 return VM_Version::supports_cx8();
3578 JVM_END
3579
3580 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3581 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3582 assert(k->is_klass(), "just checking");
3583 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3584 JVM_END
3585
3586 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3587 jclass caller,
3588 jstring interfaceMethodName,
3589 jobject factoryType,
3590 jobject interfaceMethodType,
3591 jobject implementationMember,
3592 jobject dynamicMethodType,
3593 jclass lambdaProxyClass))
3594 #if INCLUDE_CDS
3595 if (!Arguments::is_dumping_archive()) {
3596 return;
3597 }
3598
3599 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3600 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3601 if (caller_ik->is_hidden()) {
3602 // Hidden classes not of type lambda proxy classes are currently not being archived.
3603 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3604 // registered for archiving.
3605 return;
3606 }
3607 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3608 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3609 assert(lambda_ik->is_hidden(), "must be a hidden class");
3610 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3611
3612 Symbol* interface_method_name = nullptr;
3613 if (interfaceMethodName != nullptr) {
3614 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3615 }
3616 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3617 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3618
3619 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3620 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3621
3622 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3623 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3624 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3625
3626 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3627 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3628
3629 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3630 interface_method_type, m, dynamic_method_type, THREAD);
3631 #endif // INCLUDE_CDS
3632 JVM_END
3633
3634 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3635 jclass caller,
3636 jstring interfaceMethodName,
3637 jobject factoryType,
3638 jobject interfaceMethodType,
3639 jobject implementationMember,
3640 jobject dynamicMethodType))
3641 #if INCLUDE_CDS
3642
3643 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3644 implementationMember == nullptr || dynamicMethodType == nullptr) {
3645 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3646 }
3647
3648 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3649 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3650 if (!caller_ik->is_shared()) {
3651 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3652 return nullptr;
3653 }
3654
3655 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3656 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3657 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3658
3659 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3660 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3661
3662 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3663 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3664 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3665
3666 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3667 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3668
3669 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3670 interface_method_type, m, dynamic_method_type);
3671 jclass jcls = nullptr;
3672 if (lambda_ik != nullptr) {
3673 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3674 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3675 }
3676 return jcls;
3677 #else
3678 return nullptr;
3679 #endif // INCLUDE_CDS
3680 JVM_END
3681
3682 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3683 return Arguments::is_dumping_archive();
3684 JVM_END
3685
3686 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3687 return UseSharedSpaces;
3688 JVM_END
3689
3690 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3691 if (DumpSharedSpaces) {
3692 const char* release = VM_Version::vm_release();
3693 const char* dbg_level = VM_Version::jdk_debug_level();
3694 const char* version = VM_Version::internal_vm_info_string();
3695 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3696 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3697 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3698 seed += (jlong)VM_Version::vm_major_version();
3699 seed += (jlong)VM_Version::vm_minor_version();
3700 seed += (jlong)VM_Version::vm_security_version();
3701 seed += (jlong)VM_Version::vm_patch_version();
3702 if (seed == 0) { // don't let this ever be zero.
3703 seed = 0x87654321;
3704 }
3705 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3706 return seed;
3707 } else {
3708 return 0;
3709 }
3710 JVM_END
3711
3712 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3713 #if INCLUDE_CDS
3714 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3715 #else
3716 return false;
3717 #endif // INCLUDE_CDS
3718 JVM_END
3719
3720 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3721 #if INCLUDE_CDS
3722 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3723 if (line != nullptr) {
3724 ResourceMark rm(THREAD);
3725 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3726 char* c_line = java_lang_String::as_utf8_string(h_line());
3727 if (DynamicDumpSharedSpaces) {
3728 // Note: LambdaFormInvokers::append take same format which is not
3729 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3730 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3731 }
3732 if (ClassListWriter::is_enabled()) {
3733 ClassListWriter w;
3734 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3735 }
3736 }
3737 #endif // INCLUDE_CDS
3738 JVM_END
3739
3740 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3741 #if INCLUDE_CDS
3742 ResourceMark rm(THREAD);
3743 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3744 char* file_name = java_lang_String::as_utf8_string(file_handle());
3745 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3746 #endif // INCLUDE_CDS
3747 JVM_END
3748
3749 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3750 #if INCLUDE_CDS
3751 ResourceMark rm(THREAD);
3752 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3753 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3754 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3755 #endif // INCLUDE_CDS
3756 JVM_END
3757
3758 // Returns an array of all live Thread objects (VM internal JavaThreads,
3759 // jvmti agent threads, and JNI attaching threads are skipped)
3760 // See CR 6404306 regarding JNI attaching threads
3761 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3762 ResourceMark rm(THREAD);
3763 ThreadsListEnumerator tle(THREAD, false, false);
3764 JvmtiVMObjectAllocEventCollector oam;
3765
3766 int num_threads = tle.num_threads();
3767 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3768 objArrayHandle threads_ah(THREAD, r);
3769
3770 for (int i = 0; i < num_threads; i++) {
3771 Handle h = tle.get_threadObj(i);
3772 threads_ah->obj_at_put(i, h());
3773 }
3774
3775 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3776 JVM_END
3777
3778
3779 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3780 // Return StackTraceElement[][], each element is the stack trace of a thread in
3781 // the corresponding entry in the given threads array
3782 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3783 JvmtiVMObjectAllocEventCollector oam;
3784
3785 // Check if threads is null
3786 if (threads == nullptr) {
3787 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3788 }
3789
3790 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3791 objArrayHandle ah(THREAD, a);
3792 int num_threads = ah->length();
3793 // check if threads is non-empty array
3794 if (num_threads == 0) {
3795 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3796 }
3797
3798 // check if threads is not an array of objects of Thread class
3799 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3800 if (k != vmClasses::Thread_klass()) {
3801 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3802 }
3803
3804 ResourceMark rm(THREAD);
3805
3806 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3807 for (int i = 0; i < num_threads; i++) {
3808 oop thread_obj = ah->obj_at(i);
3809 instanceHandle h(THREAD, (instanceOop) thread_obj);
3810 thread_handle_array->append(h);
3811 }
3812
3813 // The JavaThread references in thread_handle_array are validated
3814 // in VM_ThreadDump::doit().
3815 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3816 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3817
3818 JVM_END
3819
3820 // JVM monitoring and management support
3821 JVM_LEAF(void*, JVM_GetManagement(jint version))
3822 return Management::get_jmm_interface(version);
3823 JVM_END
3824
3825 // com.sun.tools.attach.VirtualMachine agent properties support
3826 //
3827 // Initialize the agent properties with the properties maintained in the VM
3828 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3829 ResourceMark rm;
3830
3831 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3832
3833 PUTPROP(props, "sun.java.command", Arguments::java_command());
3834 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3835 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3836 return properties;
3837 JVM_END
3838
3839 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3840 {
3841 JvmtiVMObjectAllocEventCollector oam;
3842
3843 if (ofClass == nullptr) {
3844 return nullptr;
3845 }
3846 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3847 // Special handling for primitive objects
3848 if (java_lang_Class::is_primitive(mirror())) {
3849 return nullptr;
3850 }
3851 Klass* k = java_lang_Class::as_Klass(mirror());
3852 if (!k->is_instance_klass()) {
3853 return nullptr;
3854 }
3855 InstanceKlass* ik = InstanceKlass::cast(k);
3856 int encl_method_class_idx = ik->enclosing_method_class_index();
3857 if (encl_method_class_idx == 0) {
3858 return nullptr;
3859 }
3860 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3861 objArrayHandle dest(THREAD, dest_o);
3862 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3863 dest->obj_at_put(0, enc_k->java_mirror());
3864 int encl_method_method_idx = ik->enclosing_method_method_index();
3865 if (encl_method_method_idx != 0) {
3866 Symbol* sym = ik->constants()->symbol_at(
3867 extract_low_short_from_int(
3868 ik->constants()->name_and_type_at(encl_method_method_idx)));
3869 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3870 dest->obj_at_put(1, str());
3871 sym = ik->constants()->symbol_at(
3872 extract_high_short_from_int(
3873 ik->constants()->name_and_type_at(encl_method_method_idx)));
3874 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3875 dest->obj_at_put(2, str());
3876 }
3877 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3878 }
3879 JVM_END
3880
3881 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3882 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3883 ResourceMark rm(THREAD);
3884
3885 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3886 return nullptr;
3887 }
3888
3889 char** vm_flags = Arguments::jvm_flags_array();
3890 char** vm_args = Arguments::jvm_args_array();
3891 int num_flags = Arguments::num_jvm_flags();
3892 int num_args = Arguments::num_jvm_args();
3893
3894 InstanceKlass* ik = vmClasses::String_klass();
3895 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3896 objArrayHandle result_h(THREAD, r);
3897
3898 int index = 0;
3899 for (int j = 0; j < num_flags; j++, index++) {
3900 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3901 result_h->obj_at_put(index, h());
3902 }
3903 for (int i = 0; i < num_args; i++, index++) {
3904 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3905 result_h->obj_at_put(index, h());
3906 }
3907 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3908 JVM_END
3909
3910 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3911 return os::get_signal_number(name);
3912 JVM_END
3913
3914 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3915 #if INCLUDE_JVMTI
3916 if (!DoJVMTIVirtualThreadTransitions) {
3917 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3918 return;
3919 }
3920 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3921 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3922 } else {
3923 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3924 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3925 }
3926 #else
3927 fatal("Should only be called with JVMTI enabled");
3928 #endif
3929 JVM_END
3930
3931 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3932 #if INCLUDE_JVMTI
3933 if (!DoJVMTIVirtualThreadTransitions) {
3934 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3935 return;
3936 }
3937 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3938 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3939 } else {
3940 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3941 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3942 }
3943 #else
3944 fatal("Should only be called with JVMTI enabled");
3945 #endif
3946 JVM_END
3947
3948 // If notifications are disabled then just update the VTMS transition bit and return.
3949 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3950 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3951 #if INCLUDE_JVMTI
3952 if (!DoJVMTIVirtualThreadTransitions) {
3953 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3954 return;
3955 }
3956 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3957 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3958 } else {
3959 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3960 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3961 }
3962 #else
3963 fatal("Should only be called with JVMTI enabled");
3964 #endif
3965 JVM_END
3966
3967 // If notifications are disabled then just update the VTMS transition bit and return.
3968 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3969 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3970 #if INCLUDE_JVMTI
3971 if (!DoJVMTIVirtualThreadTransitions) {
3972 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3973 return;
3974 }
3975 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3976 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3977 } else {
3978 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3979 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3980 }
3981 #else
3982 fatal("Should only be called with JVMTI enabled");
3983 #endif
3984 JVM_END
3985
3986 // Always update the temporary VTMS transition bit.
3987 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
3988 #if INCLUDE_JVMTI
3989 if (!DoJVMTIVirtualThreadTransitions) {
3990 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3991 return;
3992 }
3993 assert(!thread->is_in_VTMS_transition(), "sanity check");
3994 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
3995 thread->toggle_is_in_tmp_VTMS_transition();
3996 #else
3997 fatal("Should only be called with JVMTI enabled");
3998 #endif
3999 JVM_END
4000
4001 /*
4002 * Return the current class's class file version. The low order 16 bits of the
4003 * returned jint contain the class's major version. The high order 16 bits
4004 * contain the class's minor version.
4005 */
4006 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4007 oop mirror = JNIHandles::resolve_non_null(current);
4008 if (java_lang_Class::is_primitive(mirror)) {
4009 // return latest major version and minor version of 0.
4010 return JVM_CLASSFILE_MAJOR_VERSION;
4011 }
4012 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4013
4014 Klass* c = java_lang_Class::as_Klass(mirror);
4015 assert(c->is_instance_klass(), "must be");
4016 InstanceKlass* ik = InstanceKlass::cast(c);
4017 return (ik->minor_version() << 16) | ik->major_version();
4018 JVM_END
4019
4020 /*
4021 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4022 * get the value will see a materialized value and not a scalar-replaced
4023 * null value.
4024 */
4025 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4026 JVM_EnsureMaterializedForStackWalk(env, value);
4027 JVM_END
4028
4029 /*
4030 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4031 */
4032 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4033 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4034 JVM_END