1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/aotMetaspace.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/classListParser.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/dynamicArchive.hpp"
31 #include "cds/heapShared.hpp"
32 #include "cds/lambdaFormInvokers.hpp"
33 #include "cds/lambdaProxyClassDictionary.hpp"
34 #include "classfile/classFileStream.hpp"
35 #include "classfile/classLoader.inline.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/method.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "oops/recordComponent.hpp"
68 #include "prims/foreignGlobals.hpp"
69 #include "prims/jvm_misc.hpp"
70 #include "prims/jvmtiExport.hpp"
71 #include "prims/jvmtiThreadState.inline.hpp"
72 #include "prims/stackwalk.hpp"
73 #include "runtime/arguments.hpp"
74 #include "runtime/atomicAccess.hpp"
75 #include "runtime/continuation.hpp"
76 #include "runtime/deoptimization.hpp"
77 #include "runtime/globals_extension.hpp"
78 #include "runtime/handles.inline.hpp"
79 #include "runtime/handshake.hpp"
80 #include "runtime/init.hpp"
81 #include "runtime/interfaceSupport.inline.hpp"
82 #include "runtime/java.hpp"
83 #include "runtime/javaCalls.hpp"
84 #include "runtime/javaThread.hpp"
85 #include "runtime/jfieldIDWorkaround.hpp"
86 #include "runtime/jniHandles.inline.hpp"
87 #include "runtime/os.inline.hpp"
88 #include "runtime/osThread.hpp"
89 #include "runtime/perfData.hpp"
90 #include "runtime/reflection.hpp"
91 #include "runtime/synchronizer.hpp"
92 #include "runtime/threadIdentifier.hpp"
93 #include "runtime/threadSMR.hpp"
94 #include "runtime/vframe.inline.hpp"
95 #include "runtime/vm_version.hpp"
96 #include "runtime/vmOperations.hpp"
97 #include "services/attachListener.hpp"
98 #include "services/management.hpp"
99 #include "services/threadService.hpp"
100 #include "utilities/checkedCast.hpp"
101 #include "utilities/copy.hpp"
102 #include "utilities/defaultStream.hpp"
103 #include "utilities/dtrace.hpp"
104 #include "utilities/events.hpp"
105 #include "utilities/macros.hpp"
106 #include "utilities/utf8.hpp"
107 #include "utilities/zipLibrary.hpp"
108 #if INCLUDE_CDS
109 #include "classfile/systemDictionaryShared.hpp"
110 #endif
111 #if INCLUDE_JFR
112 #include "jfr/jfr.hpp"
113 #endif
114 #if INCLUDE_MANAGEMENT
115 #include "services/finalizerService.hpp"
116 #endif
117 #ifdef LINUX
118 #include "osContainer_linux.hpp"
119 #endif
120
121 #include <errno.h>
122
123 /*
124 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
125 such ctors and calls MUST NOT come between an oop declaration/init and its
126 usage because if objects are move this may cause various memory stomps, bus
127 errors and segfaults. Here is a cookbook for causing so called "naked oop
128 failures":
129
130 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
131 // Object address to be held directly in mirror & not visible to GC
132 oop mirror = JNIHandles::resolve_non_null(ofClass);
133
134 // If this ctor can hit a safepoint, moving objects around, then
135 ComplexConstructor foo;
136
137 // Boom! mirror may point to JUNK instead of the intended object
138 (some dereference of mirror)
139
140 // Here's another call that may block for GC, making mirror stale
141 MutexLocker ml(some_lock);
142
143 // And here's an initializer that can result in a stale oop
144 // all in one step.
145 oop o = call_that_can_throw_exception(TRAPS);
146
147
148 The solution is to keep the oop declaration BELOW the ctor or function
149 call that might cause a GC, do another resolve to reassign the oop, or
150 consider use of a Handle instead of an oop so there is immunity from object
151 motion. But note that the "QUICK" entries below do not have a handlemark
152 and thus can only support use of handles passed in.
153 */
154
155 extern void trace_class_resolution(Klass* to_class) {
156 ResourceMark rm;
157 int line_number = -1;
158 const char * source_file = nullptr;
159 const char * trace = "explicit";
160 InstanceKlass* caller = nullptr;
161 JavaThread* jthread = JavaThread::current();
162 if (jthread->has_last_Java_frame()) {
163 vframeStream vfst(jthread);
164
165 // Scan up the stack skipping ClassLoader frames.
166 Method* last_caller = nullptr;
167
168 while (!vfst.at_end()) {
169 Method* m = vfst.method();
170 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_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 // java.lang.System //////////////////////////////////////////////////////////////////////
230
231
232 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
233 return os::javaTimeMillis();
234 JVM_END
235
236 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
237 return os::javaTimeNanos();
238 JVM_END
239
240 // The function below is actually exposed by jdk.internal.misc.VM and not
241 // java.lang.System, but we choose to keep it here so that it stays next
242 // to JVM_CurrentTimeMillis and JVM_NanoTime
243
244 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
245 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
246
247 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
248 jlong seconds;
249 jlong nanos;
250
251 os::javaTimeSystemUTC(seconds, nanos);
252
253 // We're going to verify that the result can fit in a long.
254 // For that we need the difference in seconds between 'seconds'
255 // and 'offset_secs' to be such that:
256 // |seconds - offset_secs| < (2^63/10^9)
257 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
258 // which makes |seconds - offset_secs| < 2^33
259 // and we will prefer +/- 2^32 as the maximum acceptable diff
260 // as 2^32 has a more natural feel than 2^33...
261 //
262 // So if |seconds - offset_secs| >= 2^32 - we return a special
263 // sentinel value (-1) which the caller should take as an
264 // exception value indicating that the offset given to us is
265 // too far from range of the current time - leading to too big
266 // a nano adjustment. The caller is expected to recover by
267 // computing a more accurate offset and calling this method
268 // again. (For the record 2^32 secs is ~136 years, so that
269 // should rarely happen)
270 //
271 jlong diff = seconds - offset_secs;
272 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
273 return -1; // sentinel value: the offset is too far off the target
274 }
275
276 // return the adjustment. If you compute a time by adding
277 // this number of nanoseconds along with the number of seconds
278 // in the offset you should get the current UTC time.
279 return (diff * (jlong)1000000000) + nanos;
280 JVM_END
281
282 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
283 jobject dst, jint dst_pos, jint length))
284 // Check if we have null pointers
285 if (src == nullptr || dst == nullptr) {
286 THROW(vmSymbols::java_lang_NullPointerException());
287 }
288 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
289 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
290 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
291 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
292 // Do copy
293 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
294 JVM_END
295
296
297 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
298 JavaValue r(T_OBJECT);
299 // public synchronized Object put(Object key, Object value);
300 HandleMark hm(THREAD);
301 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
302 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
303 JavaCalls::call_virtual(&r,
304 props,
305 vmClasses::Properties_klass(),
306 vmSymbols::put_name(),
307 vmSymbols::object_object_object_signature(),
308 key_str,
309 value_str,
310 THREAD);
311 }
312
313
314 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
315
316 /*
317 * Return all of the system properties in a Java String array with alternating
318 * names and values from the jvm SystemProperty.
319 * Which includes some internal and all commandline -D defined properties.
320 */
321 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
322 ResourceMark rm(THREAD);
323 HandleMark hm(THREAD);
324 int ndx = 0;
325 int fixedCount = 2;
326
327 SystemProperty* p = Arguments::system_properties();
328 int count = Arguments::PropertyList_count(p);
329
330 // Allocate result String array
331 InstanceKlass* ik = vmClasses::String_klass();
332 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
333 objArrayHandle result_h(THREAD, r);
334
335 while (p != nullptr) {
336 const char * key = p->key();
337 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
338 const char * value = p->value();
339 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
340 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
341 result_h->obj_at_put(ndx * 2, key_str());
342 result_h->obj_at_put(ndx * 2 + 1, value_str());
343 ndx++;
344 }
345 p = p->next();
346 }
347
348 // Convert the -XX:MaxDirectMemorySize= command line flag
349 // to the sun.nio.MaxDirectMemorySize property.
350 // Do this after setting user properties to prevent people
351 // from setting the value with a -D option, as requested.
352 // Leave empty if not supplied
353 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
354 char as_chars[256];
355 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
356 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
357 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
358 result_h->obj_at_put(ndx * 2, key_str());
359 result_h->obj_at_put(ndx * 2 + 1, value_str());
360 ndx++;
361 }
362
363 // JVM monitoring and management support
364 // Add the sun.management.compiler property for the compiler's name
365 {
366 #undef CSIZE
367 #if defined(_LP64)
368 #define CSIZE "64-Bit "
369 #else
370 #define CSIZE
371 #endif // 64bit
372
373 #if COMPILER1_AND_COMPILER2
374 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
375 #else
376 #if defined(COMPILER1)
377 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
378 #elif defined(COMPILER2)
379 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
380 #elif INCLUDE_JVMCI
381 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
382 #else
383 const char* compiler_name = "";
384 #endif // compilers
385 #endif // COMPILER1_AND_COMPILER2
386
387 if (*compiler_name != '\0' &&
388 (Arguments::mode() != Arguments::_int)) {
389 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
390 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
391 result_h->obj_at_put(ndx * 2, key_str());
392 result_h->obj_at_put(ndx * 2 + 1, value_str());
393 ndx++;
394 }
395 }
396
397 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
398 JVM_END
399
400
401 /*
402 * Return the temporary directory that the VM uses for the attach
403 * and perf data files.
404 *
405 * It is important that this directory is well-known and the
406 * same for all VM instances. It cannot be affected by configuration
407 * variables such as java.io.tmpdir.
408 */
409 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
410 HandleMark hm(THREAD);
411 const char* temp_dir = os::get_temp_directory();
412 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
413 return (jstring) JNIHandles::make_local(THREAD, h());
414 JVM_END
415
416
417 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
418
419 extern volatile jint vm_created;
420
421 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
422 EventShutdown event;
423 if (event.should_commit()) {
424 event.set_reason("Shutdown requested from Java");
425 event.commit();
426 }
427 JVM_END
428
429
430 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
431 before_exit(thread, true);
432 vm_exit(code);
433 JVM_END
434
435
436 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
437 if (!DisableExplicitGC) {
438 EventSystemGC event;
439 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
440 Universe::heap()->collect(GCCause::_java_lang_system_gc);
441 event.commit();
442 }
443 JVM_END
444
445
446 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
447 return Universe::heap()->millis_since_last_whole_heap_examined();
448 JVM_END
449
450
451 static inline jlong convert_size_t_to_jlong(size_t val) {
452 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
453 NOT_LP64 (return (jlong)val;)
454 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
455 }
456
457 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
458 size_t n = Universe::heap()->capacity();
459 return convert_size_t_to_jlong(n);
460 JVM_END
461
462
463 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
464 size_t n = Universe::heap()->unused();
465 return convert_size_t_to_jlong(n);
466 JVM_END
467
468
469 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
470 size_t n = Universe::heap()->max_capacity();
471 return convert_size_t_to_jlong(n);
472 JVM_END
473
474
475 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
476 return os::active_processor_count();
477 JVM_END
478
479 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
480 #ifdef LINUX
481 if (UseContainerSupport) {
482 return JNI_TRUE;
483 }
484 #endif
485 return JNI_FALSE;
486 JVM_END
487
488 JVM_LEAF(jboolean, JVM_IsContainerized(void))
489 #ifdef LINUX
490 if (OSContainer::is_containerized()) {
491 return JNI_TRUE;
492 }
493 #endif
494 return JNI_FALSE;
495 JVM_END
496
497 // java.lang.Throwable //////////////////////////////////////////////////////
498
499 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
500 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
501 java_lang_Throwable::fill_in_stack_trace(exception);
502 JVM_END
503
504 // java.lang.NullPointerException ///////////////////////////////////////////
505
506 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
507 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
508
509 oop exc = JNIHandles::resolve_non_null(throwable);
510
511 Method* method;
512 int bci;
513 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
514 return nullptr;
515 }
516 if (method->is_native()) {
517 return nullptr;
518 }
519
520 stringStream ss;
521 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
522 if (ok) {
523 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
524 return (jstring) JNIHandles::make_local(THREAD, result);
525 } else {
526 return nullptr;
527 }
528 JVM_END
529
530 // java.lang.StackTraceElement //////////////////////////////////////////////
531
532
533 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
534 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
535 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
536 objArrayHandle stack_trace(THREAD, st);
537 // Fill in the allocated stack trace
538 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
539 JVM_END
540
541
542 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
543 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
544 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
545 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
546 JVM_END
547
548
549 // java.lang.StackWalker //////////////////////////////////////////////////////
550 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
551 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
552
553 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
554 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
555 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
556 if (!have_name) {
557 oop name = StringTable::intern(method->name(), CHECK);
558 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
559 }
560 if (!have_type) {
561 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
562 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
563 }
564 JVM_END
565
566 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
567 jint skip_frames, jobject contScope, jobject cont,
568 jint buffer_size, jint start_index, jobjectArray frames))
569 if (!thread->has_last_Java_frame()) {
570 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
571 }
572
573 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
574 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
575 Handle cont_h(THREAD, JNIHandles::resolve(cont));
576 // frames array is a ClassFrameInfo[] array when only getting caller reference,
577 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
578 // be null.
579 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
580 objArrayHandle frames_array_h(THREAD, fa);
581
582 if (frames_array_h->length() < buffer_size) {
583 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
584 }
585
586 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
587 buffer_size, start_index, frames_array_h, CHECK_NULL);
588 return JNIHandles::make_local(THREAD, result);
589 JVM_END
590
591
592 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
593 jint last_batch_count, jint buffer_size, jint start_index,
594 jobjectArray frames))
595 // frames array is a ClassFrameInfo[] array when only getting caller reference,
596 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
597 // be null.
598 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
599 objArrayHandle frames_array_h(THREAD, fa);
600
601 if (frames_array_h->length() < buffer_size) {
602 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
603 }
604
605 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
606 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
607 start_index, frames_array_h, THREAD);
608 JVM_END
609
610 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
611 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
612 objArrayHandle frames_array_h(THREAD, fa);
613 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
614 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
615
616 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
617 JVM_END
618
619 // java.lang.Object ///////////////////////////////////////////////
620
621
622 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
623 // as implemented in the classic virtual machine; return 0 if object is null
624 return handle == nullptr ? 0 :
625 checked_cast<jint>(ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)));
626 JVM_END
627
628
629 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
630 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
631 ObjectSynchronizer::wait(obj, ms, CHECK);
632 JVM_END
633
634
635 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
636 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
637 ObjectSynchronizer::notify(obj, CHECK);
638 JVM_END
639
640
641 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
642 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
643 ObjectSynchronizer::notifyall(obj, CHECK);
644 JVM_END
645
646
647 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
648 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
649 Klass* klass = obj->klass();
650 JvmtiVMObjectAllocEventCollector oam;
651
652 #ifdef ASSERT
653 // Just checking that the cloneable flag is set correct
654 if (obj->is_array()) {
655 guarantee(klass->is_cloneable(), "all arrays are cloneable");
656 } else {
657 guarantee(obj->is_instance(), "should be instanceOop");
658 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
659 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
660 }
661 #endif
662
663 // Check if class of obj supports the Cloneable interface.
664 // All arrays are considered to be cloneable (See JLS 20.1.5).
665 // All j.l.r.Reference classes are considered non-cloneable.
666 if (!klass->is_cloneable() ||
667 (klass->is_instance_klass() &&
668 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
669 ResourceMark rm(THREAD);
670 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
671 }
672
673 // Make shallow object copy
674 // With compact object headers, the original might have been expanded by GC
675 // for the identity hash. The clone must be allocated at the base size, since
676 // it will get a fresh (not-hashed, not-expanded) mark word.
677 const size_t size = UseCompactObjectHeaders
678 ? obj->base_size_given_klass(obj->mark(), klass)
679 : obj->size();
680 oop new_obj_oop = nullptr;
681 if (obj->is_array()) {
682 const int length = ((arrayOop)obj())->length();
683 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
684 /* do_zero */ true, CHECK_NULL);
685 } else {
686 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
687 }
688
689 HeapAccess<>::clone(obj(), new_obj_oop, size);
690
691 Handle new_obj(THREAD, new_obj_oop);
692 // Caution: this involves a java upcall, so the clone should be
693 // "gc-robust" by this stage.
694 if (klass->has_finalizer()) {
695 assert(obj->is_instance(), "should be instanceOop");
696 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
697 new_obj = Handle(THREAD, new_obj_oop);
698 }
699
700 return JNIHandles::make_local(THREAD, new_obj());
701 JVM_END
702
703 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
704
705 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
706 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
707 JVM_END
708
709 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
710 return InstanceKlass::is_finalization_enabled();
711 JVM_END
712
713 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
714
715 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
716 CONT_RegisterNativeMethods(env, cls);
717 JVM_END
718
719 // java.io.File ///////////////////////////////////////////////////////////////
720
721 JVM_LEAF(char*, JVM_NativePath(char* path))
722 return os::native_path(path);
723 JVM_END
724
725
726 // Misc. class handling ///////////////////////////////////////////////////////////
727
728
729 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
730 // Getting the class of the caller frame.
731 //
732 // The call stack at this point looks something like this:
733 //
734 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
735 // [1] [ @CallerSensitive API.method ]
736 // [.] [ (skipped intermediate frames) ]
737 // [n] [ caller ]
738 vframeStream vfst(thread);
739 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
740 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
741 Method* m = vfst.method();
742 assert(m != nullptr, "sanity");
743 switch (n) {
744 case 0:
745 // This must only be called from Reflection.getCallerClass
746 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
747 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
748 }
749 // fall-through
750 case 1:
751 // Frame 0 and 1 must be caller sensitive.
752 if (!m->caller_sensitive()) {
753 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
754 }
755 break;
756 default:
757 if (!m->is_ignored_by_security_stack_walk()) {
758 // We have reached the desired frame; return the holder class.
759 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
760 }
761 break;
762 }
763 }
764 return nullptr;
765 JVM_END
766
767
768 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
769 oop mirror = nullptr;
770 BasicType t = name2type(utf);
771 if (t != T_ILLEGAL && !is_reference_type(t)) {
772 mirror = Universe::java_mirror(t);
773 }
774 if (mirror == nullptr) {
775 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
776 } else {
777 return (jclass) JNIHandles::make_local(THREAD, mirror);
778 }
779 JVM_END
780
781
782 // Returns a class loaded by the bootstrap class loader; or null
783 // if not found. ClassNotFoundException is not thrown.
784 // FindClassFromBootLoader is exported to the launcher for windows.
785 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
786 const char* name))
787 // Java libraries should ensure that name is never null or illegal.
788 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
789 // It's impossible to create this class; the name cannot fit
790 // into the constant pool.
791 return nullptr;
792 }
793 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
794
795 TempNewSymbol h_name = SymbolTable::new_symbol(name);
796 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
797 if (k == nullptr) {
798 return nullptr;
799 }
800
801 if (log_is_enabled(Debug, class, resolve)) {
802 trace_class_resolution(k);
803 }
804 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
805 JVM_END
806
807 // Find a class with this name in this loader.
808 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
809 jboolean init, jobject loader))
810 TempNewSymbol h_name =
811 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
812 CHECK_NULL);
813
814 oop loader_oop = JNIHandles::resolve(loader);
815 Handle h_loader(THREAD, loader_oop);
816
817 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
818 false, THREAD);
819
820 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
821 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
822 }
823 return result;
824 JVM_END
825
826 // Currently only called from the old verifier.
827 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
828 jboolean init, jclass from))
829 TempNewSymbol h_name =
830 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
831 CHECK_NULL);
832 oop from_class_oop = JNIHandles::resolve(from);
833 assert(from_class_oop != nullptr, "must be");
834 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
835 assert(from_class != nullptr, "must be");
836 oop class_loader = from_class->class_loader();
837
838 Handle h_loader(THREAD, class_loader);
839 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
840
841 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
842 // this function is generally only used for class loading during verification.
843 ResourceMark rm;
844 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
845 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
846 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
847 }
848
849 #if INCLUDE_CDS
850 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
851 InstanceKlass* ik = InstanceKlass::cast(from_class);
852 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
853 }
854 #endif
855
856 return result;
857 JVM_END
858
859 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
860 static jclass jvm_define_class_common(const char *name,
861 jobject loader, const jbyte *buf,
862 jsize len, jobject pd, const char *source,
863 TRAPS) {
864 if (source == nullptr) source = "__JVM_DefineClass__";
865
866 JavaThread* jt = THREAD;
867
868 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
869 ClassLoader::perf_define_appclass_selftime(),
870 ClassLoader::perf_define_appclasses(),
871 jt->get_thread_stat()->perf_recursion_counts_addr(),
872 jt->get_thread_stat()->perf_timers_addr(),
873 PerfClassTraceTime::DEFINE_CLASS);
874
875 if (UsePerfData) {
876 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
877 }
878
879 // Class resolution will get the class name from the .class stream if the name is null.
880 TempNewSymbol class_name = name == nullptr ? nullptr :
881 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
882 CHECK_NULL);
883
884 ResourceMark rm(THREAD);
885 ClassFileStream st((u1*)buf, len, source);
886 Handle class_loader (THREAD, JNIHandles::resolve(loader));
887 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
888 ClassLoadInfo cl_info(protection_domain);
889 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
890 class_loader,
891 cl_info,
892 CHECK_NULL);
893
894 if (log_is_enabled(Debug, class, resolve)) {
895 trace_class_resolution(k);
896 }
897
898 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
899 }
900
901 enum {
902 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
903 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
904 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
905 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
906 };
907
908 /*
909 * Define a class with the specified flags that indicates if it's a nestmate,
910 * hidden, or strongly referenced from class loader.
911 */
912 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
913 const jbyte *buf, jsize len, jobject pd,
914 jboolean init, int flags, jobject classData, TRAPS) {
915 ResourceMark rm(THREAD);
916
917 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
918 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
919 if (lookup_k == nullptr) {
920 // The error message is wrong. We come here only if lookup is a primitive class
921 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
922 }
923
924 Handle class_loader (THREAD, lookup_k->class_loader());
925
926 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
927 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
928 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
929 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
930
931 InstanceKlass* host_class = nullptr;
932 if (is_nestmate) {
933 host_class = lookup_k->nest_host(CHECK_NULL);
934 }
935
936 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
937 name,
938 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
939 is_nestmate ? host_class->external_name() : "",
940 is_hidden ? "hidden" : "not hidden",
941 is_strong ? "strong" : "weak",
942 vm_annotations ? "with vm annotations" : "without vm annotation");
943
944 if (!is_hidden) {
945 // classData is only applicable for hidden classes
946 if (classData != nullptr) {
947 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
948 }
949 if (is_nestmate) {
950 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
951 }
952 if (!is_strong) {
953 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
954 }
955 if (vm_annotations) {
956 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
957 }
958 if (flags != STRONG_LOADER_LINK) {
959 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
960 err_msg("invalid flag 0x%x", flags));
961 }
962 }
963
964 // Class resolution will get the class name from the .class stream if the name is null.
965 TempNewSymbol class_name = name == nullptr ? nullptr :
966 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
967 CHECK_NULL);
968
969 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
970 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
971 ClassFileStream st((u1*)buf, len, source);
972
973 InstanceKlass* ik = nullptr;
974 if (!is_hidden) {
975 ClassLoadInfo cl_info(protection_domain);
976 ik = SystemDictionary::resolve_from_stream(&st, class_name,
977 class_loader,
978 cl_info,
979 CHECK_NULL);
980
981 if (log_is_enabled(Debug, class, resolve)) {
982 trace_class_resolution(ik);
983 }
984 } else { // hidden
985 Handle classData_h(THREAD, JNIHandles::resolve(classData));
986 ClassLoadInfo cl_info(protection_domain,
987 host_class,
988 classData_h,
989 is_hidden,
990 is_strong,
991 vm_annotations);
992 ik = SystemDictionary::resolve_from_stream(&st, class_name,
993 class_loader,
994 cl_info,
995 CHECK_NULL);
996
997 // The hidden class loader data has been artificially been kept alive to
998 // this point. The mirror and any instances of this class have to keep
999 // it alive afterwards.
1000 ik->class_loader_data()->dec_keep_alive_ref_count();
1001
1002 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1003 ModuleEntry* module = ik->module();
1004 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1005 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1006 module_name,
1007 ik->external_name(),
1008 host_class->external_name(),
1009 ik->is_hidden() ? "is hidden" : "is not hidden");
1010 }
1011 }
1012
1013 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1014 // non-hidden class or nestmate class must be in the same package as the Lookup class
1015 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1016 }
1017
1018 if (init) {
1019 ik->initialize(CHECK_NULL);
1020 } else {
1021 ik->link_class(CHECK_NULL);
1022 }
1023
1024 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1025 }
1026
1027 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1028 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1029 JVM_END
1030
1031 /*
1032 * Define a class with the specified lookup class.
1033 * lookup: Lookup class
1034 * name: the name of the class
1035 * buf: class bytes
1036 * len: length of class bytes
1037 * pd: protection domain
1038 * init: initialize the class
1039 * flags: properties of the class
1040 * classData: private static pre-initialized field
1041 */
1042 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1043 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1044
1045 if (lookup == nullptr) {
1046 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1047 }
1048
1049 assert(buf != nullptr, "buf must not be null");
1050
1051 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1052 JVM_END
1053
1054 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1055
1056 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1057 JVM_END
1058
1059 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1060 ResourceMark rm(THREAD);
1061
1062 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1063 char* str = java_lang_String::as_utf8_string(h_name());
1064
1065 // Sanity check, don't expect null
1066 if (str == nullptr) return nullptr;
1067
1068 // Internalize the string, converting '.' to '/' in string.
1069 char* p = (char*)str;
1070 while (*p != '\0') {
1071 if (*p == '.') {
1072 *p = '/';
1073 }
1074 p++;
1075 }
1076
1077 const int str_len = (int)(p - str);
1078 if (str_len > Symbol::max_length()) {
1079 // It's impossible to create this class; the name cannot fit
1080 // into the constant pool.
1081 return nullptr;
1082 }
1083 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1084
1085 // Security Note:
1086 // The Java level wrapper will perform the necessary security check allowing
1087 // us to pass the null as the initiating class loader.
1088 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1089 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1090 #if INCLUDE_CDS
1091 if (k == nullptr) {
1092 // If the class is not already loaded, try to see if it's in the shared
1093 // archive for the current classloader (h_loader).
1094 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1095 }
1096 #endif
1097 return (k == nullptr) ? nullptr :
1098 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1099 JVM_END
1100
1101 // Module support //////////////////////////////////////////////////////////////////////////////
1102
1103 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1104 jstring location, jobjectArray packages))
1105 Handle h_module (THREAD, JNIHandles::resolve(module));
1106 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1107 JVM_END
1108
1109 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1110 Handle h_module (THREAD, JNIHandles::resolve(module));
1111 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1112 JVM_END
1113
1114 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1115 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1116 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1117 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1118 JVM_END
1119
1120 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1121 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1122 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1123 JVM_END
1124
1125 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1126 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1127 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1128 JVM_END
1129
1130 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1131 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1132 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1133 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1134 JVM_END
1135
1136 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1137 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1138 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1139 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1140 JVM_END
1141
1142 // Reflection support //////////////////////////////////////////////////////////////////////////////
1143
1144 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1145 assert (cls != nullptr, "illegal class");
1146 JvmtiVMObjectAllocEventCollector oam;
1147 ResourceMark rm(THREAD);
1148 HandleMark hm(THREAD);
1149 Handle java_class(THREAD, JNIHandles::resolve(cls));
1150 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1151 return (jstring) JNIHandles::make_local(THREAD, result);
1152 JVM_END
1153
1154
1155 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1156 JvmtiVMObjectAllocEventCollector oam;
1157 oop mirror = JNIHandles::resolve_non_null(cls);
1158
1159 // Special handling for primitive objects
1160 if (java_lang_Class::is_primitive(mirror)) {
1161 // Primitive objects does not have any interfaces
1162 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1163 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1164 }
1165
1166 Klass* klass = java_lang_Class::as_Klass(mirror);
1167 // Figure size of result array
1168 int size;
1169 if (klass->is_instance_klass()) {
1170 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1171 } else {
1172 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1173 size = 2;
1174 }
1175
1176 // Allocate result array
1177 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1178 objArrayHandle result (THREAD, r);
1179 // Fill in result
1180 if (klass->is_instance_klass()) {
1181 // Regular instance klass, fill in all local interfaces
1182 for (int index = 0; index < size; index++) {
1183 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1184 result->obj_at_put(index, k->java_mirror());
1185 }
1186 } else {
1187 // All arrays implement java.lang.Cloneable and java.io.Serializable
1188 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1189 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1190 }
1191 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1192 JVM_END
1193
1194
1195 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1196 oop mirror = JNIHandles::resolve_non_null(cls);
1197 if (java_lang_Class::is_primitive(mirror)) {
1198 return JNI_FALSE;
1199 }
1200 Klass* k = java_lang_Class::as_Klass(mirror);
1201 return k->is_hidden();
1202 JVM_END
1203
1204
1205 class ScopedValueBindingsResolver {
1206 public:
1207 InstanceKlass* Carrier_klass;
1208 ScopedValueBindingsResolver(JavaThread* THREAD) {
1209 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1210 Carrier_klass = InstanceKlass::cast(k);
1211 }
1212 };
1213
1214 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1215 ResourceMark rm(THREAD);
1216 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1217 JvmtiVMObjectAllocEventCollector oam;
1218
1219 static ScopedValueBindingsResolver resolver(THREAD);
1220
1221 // Iterate through Java frames
1222 vframeStream vfst(thread);
1223 for(; !vfst.at_end(); vfst.next()) {
1224 int loc = -1;
1225 // get method of frame
1226 Method* method = vfst.method();
1227
1228 Symbol *name = method->name();
1229
1230 InstanceKlass* holder = method->method_holder();
1231 if (name == vmSymbols::runWith_method_name()) {
1232 if (holder == vmClasses::Thread_klass()
1233 || holder == resolver.Carrier_klass) {
1234 loc = 1;
1235 }
1236 }
1237
1238 if (loc != -1) {
1239 javaVFrame *frame = vfst.asJavaVFrame();
1240 StackValueCollection* locals = frame->locals();
1241 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1242 Handle result = head_sv->get_obj();
1243 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1244 if (result() != nullptr) {
1245 return JNIHandles::make_local(THREAD, result());
1246 }
1247 }
1248 }
1249
1250 return nullptr;
1251 JVM_END
1252
1253 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1254 JvmtiVMObjectAllocEventCollector oam;
1255 // ofClass is a reference to a java_lang_Class object. The mirror object
1256 // of an InstanceKlass
1257 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1258 if (java_lang_Class::is_primitive(ofMirror) ||
1259 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1260 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1261 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1262 }
1263
1264 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1265 InnerClassesIterator iter(k);
1266
1267 if (iter.length() == 0) {
1268 // Neither an inner nor outer class
1269 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1270 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1271 }
1272
1273 // find inner class info
1274 constantPoolHandle cp(thread, k->constants());
1275 int length = iter.length();
1276
1277 // Allocate temp. result array
1278 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1279 objArrayHandle result (THREAD, r);
1280 int members = 0;
1281
1282 for (; !iter.done(); iter.next()) {
1283 int ioff = iter.inner_class_info_index();
1284 int ooff = iter.outer_class_info_index();
1285
1286 if (ioff != 0 && ooff != 0) {
1287 // Check to see if the name matches the class we're looking for
1288 // before attempting to find the class.
1289 if (cp->klass_name_at_matches(k, ooff)) {
1290 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1291 if (outer_klass == k) {
1292 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1293 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1294
1295 // Throws an exception if outer klass has not declared k as
1296 // an inner klass
1297 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1298
1299 result->obj_at_put(members, inner_klass->java_mirror());
1300 members++;
1301 }
1302 }
1303 }
1304 }
1305
1306 if (members != length) {
1307 // Return array of right length
1308 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1309 for(int i = 0; i < members; i++) {
1310 res->obj_at_put(i, result->obj_at(i));
1311 }
1312 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1313 }
1314
1315 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1316 JVM_END
1317
1318
1319 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1320 {
1321 // ofClass is a reference to a java_lang_Class object.
1322 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1323 if (java_lang_Class::is_primitive(ofMirror)) {
1324 return nullptr;
1325 }
1326 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1327 if (!klass->is_instance_klass()) {
1328 return nullptr;
1329 }
1330
1331 bool inner_is_member = false;
1332 Klass* outer_klass
1333 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1334 if (outer_klass == nullptr) return nullptr; // already a top-level class
1335 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1336 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1337 }
1338 JVM_END
1339
1340 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1341 {
1342 oop mirror = JNIHandles::resolve_non_null(cls);
1343 if (java_lang_Class::is_primitive(mirror)) {
1344 return nullptr;
1345 }
1346 Klass* klass = java_lang_Class::as_Klass(mirror);
1347 if (!klass->is_instance_klass()) {
1348 return nullptr;
1349 }
1350 InstanceKlass* k = InstanceKlass::cast(klass);
1351 int ooff = 0, noff = 0;
1352 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1353 if (noff != 0) {
1354 constantPoolHandle i_cp(thread, k->constants());
1355 Symbol* name = i_cp->symbol_at(noff);
1356 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1357 return (jstring) JNIHandles::make_local(THREAD, str());
1358 }
1359 }
1360 return nullptr;
1361 }
1362 JVM_END
1363
1364 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1365 assert (cls != nullptr, "illegal class");
1366 JvmtiVMObjectAllocEventCollector oam;
1367 ResourceMark rm(THREAD);
1368 oop mirror = JNIHandles::resolve_non_null(cls);
1369 // Return null for arrays and primitives
1370 if (!java_lang_Class::is_primitive(mirror)) {
1371 Klass* k = java_lang_Class::as_Klass(mirror);
1372 if (k->is_instance_klass()) {
1373 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1374 if (sym == nullptr) return nullptr;
1375 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1376 return (jstring) JNIHandles::make_local(THREAD, str());
1377 }
1378 }
1379 return nullptr;
1380 JVM_END
1381
1382
1383 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1384 assert (cls != nullptr, "illegal class");
1385 oop mirror = JNIHandles::resolve_non_null(cls);
1386 // Return null for arrays and primitives
1387 if (!java_lang_Class::is_primitive(mirror)) {
1388 Klass* k = java_lang_Class::as_Klass(mirror);
1389 if (k->is_instance_klass()) {
1390 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1391 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1392 }
1393 }
1394 return nullptr;
1395 JVM_END
1396
1397
1398 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1399 // some of this code was adapted from from jni_FromReflectedField
1400
1401 oop reflected = JNIHandles::resolve_non_null(field);
1402 oop mirror = java_lang_reflect_Field::clazz(reflected);
1403 int slot = java_lang_reflect_Field::slot(reflected);
1404 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1405
1406 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1407 int offset = ik->field_offset(slot);
1408
1409 if (modifiers & JVM_ACC_STATIC) {
1410 // for static fields we only look in the current class
1411 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1412 assert(false, "cannot find static field");
1413 return false;
1414 }
1415 } else {
1416 // for instance fields we start with the current class and work
1417 // our way up through the superclass chain
1418 if (!ik->find_field_from_offset(offset, false, &fd)) {
1419 assert(false, "cannot find instance field");
1420 return false;
1421 }
1422 }
1423 return true;
1424 }
1425
1426 static Method* jvm_get_method_common(jobject method) {
1427 // some of this code was adapted from from jni_FromReflectedMethod
1428
1429 oop reflected = JNIHandles::resolve_non_null(method);
1430 oop mirror = nullptr;
1431 int slot = 0;
1432
1433 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1434 mirror = java_lang_reflect_Constructor::clazz(reflected);
1435 slot = java_lang_reflect_Constructor::slot(reflected);
1436 } else {
1437 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1438 "wrong type");
1439 mirror = java_lang_reflect_Method::clazz(reflected);
1440 slot = java_lang_reflect_Method::slot(reflected);
1441 }
1442 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1443
1444 Method* m = ik->method_with_idnum(slot);
1445 assert(m != nullptr, "cannot find method");
1446 return m; // caller has to deal with null in product mode
1447 }
1448
1449 /* Type use annotations support (JDK 1.8) */
1450
1451 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1452 assert (cls != nullptr, "illegal class");
1453 ResourceMark rm(THREAD);
1454 // Return null for arrays and primitives
1455 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1457 if (k->is_instance_klass()) {
1458 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1459 if (type_annotations != nullptr) {
1460 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1461 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1462 }
1463 }
1464 }
1465 return nullptr;
1466 JVM_END
1467
1468 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1469 assert (method != nullptr, "illegal method");
1470 // method is a handle to a java.lang.reflect.Method object
1471 Method* m = jvm_get_method_common(method);
1472 if (m == nullptr) {
1473 return nullptr;
1474 }
1475
1476 AnnotationArray* type_annotations = m->type_annotations();
1477 if (type_annotations != nullptr) {
1478 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1479 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1480 }
1481
1482 return nullptr;
1483 JVM_END
1484
1485 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1486 assert (field != nullptr, "illegal field");
1487 fieldDescriptor fd;
1488 bool gotFd = jvm_get_field_common(field, fd);
1489 if (!gotFd) {
1490 return nullptr;
1491 }
1492
1493 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1494 JVM_END
1495
1496 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1497 if (!cp->is_within_bounds(index)) {
1498 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1499 }
1500 }
1501
1502 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1503 {
1504 // method is a handle to a java.lang.reflect.Method object
1505 Method* method_ptr = jvm_get_method_common(method);
1506 methodHandle mh (THREAD, method_ptr);
1507 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1508 const int num_params = mh->method_parameters_length();
1509
1510 if (num_params < 0) {
1511 // A -1 return value from method_parameters_length means there is no
1512 // parameter data. Return null to indicate this to the reflection
1513 // API.
1514 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1515 return (jobjectArray)nullptr;
1516 } else {
1517 // Otherwise, we return something up to reflection, even if it is
1518 // a zero-length array. Why? Because in some cases this can
1519 // trigger a MalformedParametersException.
1520
1521 // make sure all the symbols are properly formatted
1522 for (int i = 0; i < num_params; i++) {
1523 MethodParametersElement* params = mh->method_parameters_start();
1524 int index = params[i].name_cp_index;
1525 constantPoolHandle cp(THREAD, mh->constants());
1526 bounds_check(cp, index, CHECK_NULL);
1527
1528 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1529 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1530 "Wrong type at constant pool index");
1531 }
1532
1533 }
1534
1535 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1536 objArrayHandle result (THREAD, result_oop);
1537
1538 for (int i = 0; i < num_params; i++) {
1539 MethodParametersElement* params = mh->method_parameters_start();
1540 // For a 0 index, give a null symbol
1541 Symbol* sym = 0 != params[i].name_cp_index ?
1542 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1543 int flags = params[i].flags;
1544 oop param = Reflection::new_parameter(reflected_method, i, sym,
1545 flags, CHECK_NULL);
1546 result->obj_at_put(i, param);
1547 }
1548 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1549 }
1550 }
1551 JVM_END
1552
1553 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1554
1555 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1556 {
1557 JvmtiVMObjectAllocEventCollector oam;
1558
1559 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1560 // Exclude primitive types and array types
1561 if (java_lang_Class::is_primitive(ofMirror) ||
1562 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1563 // Return empty array
1564 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1565 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1566 }
1567
1568 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1569 constantPoolHandle cp(THREAD, k->constants());
1570
1571 // Ensure class is linked
1572 k->link_class(CHECK_NULL);
1573
1574 // Allocate result
1575 int num_fields;
1576
1577 if (publicOnly) {
1578 num_fields = 0;
1579 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1580 if (fs.access_flags().is_public()) ++num_fields;
1581 }
1582 } else {
1583 num_fields = k->java_fields_count();
1584 }
1585
1586 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1587 objArrayHandle result (THREAD, r);
1588
1589 int out_idx = 0;
1590 fieldDescriptor fd;
1591 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1592 if (!publicOnly || fs.access_flags().is_public()) {
1593 fd.reinitialize(k, fs.to_FieldInfo());
1594 oop field = Reflection::new_field(&fd, CHECK_NULL);
1595 result->obj_at_put(out_idx, field);
1596 ++out_idx;
1597 }
1598 }
1599 assert(out_idx == num_fields, "just checking");
1600 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1601 }
1602 JVM_END
1603
1604 // A class is a record if and only if it is final and a direct subclass of
1605 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1606 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1607 {
1608 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1609 if (k != nullptr && k->is_instance_klass()) {
1610 InstanceKlass* ik = InstanceKlass::cast(k);
1611 return ik->is_record();
1612 } else {
1613 return false;
1614 }
1615 }
1616 JVM_END
1617
1618 // Returns an array containing the components of the Record attribute,
1619 // or null if the attribute is not present.
1620 //
1621 // Note that this function returns the components of the Record attribute
1622 // even if the class is not a record.
1623 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1624 {
1625 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1626
1627 Array<RecordComponent*>* components = ik->record_components();
1628 if (components != nullptr) {
1629 JvmtiVMObjectAllocEventCollector oam;
1630 constantPoolHandle cp(THREAD, ik->constants());
1631 int length = components->length();
1632 assert(length >= 0, "unexpected record_components length");
1633 objArrayOop record_components =
1634 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1635 objArrayHandle components_h (THREAD, record_components);
1636
1637 for (int x = 0; x < length; x++) {
1638 RecordComponent* component = components->at(x);
1639 assert(component != nullptr, "unexpected null record component");
1640 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1641 components_h->obj_at_put(x, component_oop);
1642 }
1643 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1644 }
1645
1646 return nullptr;
1647 }
1648 JVM_END
1649
1650 static jobjectArray get_class_declared_methods_helper(
1651 JNIEnv *env,
1652 jclass ofClass, jboolean publicOnly,
1653 bool want_constructor,
1654 Klass* klass, TRAPS) {
1655
1656 JvmtiVMObjectAllocEventCollector oam;
1657
1658 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1659 // Exclude primitive types and array types
1660 if (java_lang_Class::is_primitive(ofMirror)
1661 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1662 // Return empty array
1663 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1664 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1665 }
1666
1667 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1668
1669 // Ensure class is linked
1670 k->link_class(CHECK_NULL);
1671
1672 Array<Method*>* methods = k->methods();
1673 int methods_length = methods->length();
1674
1675 // Save original method_idnum in case of redefinition, which can change
1676 // the idnum of obsolete methods. The new method will have the same idnum
1677 // but if we refresh the methods array, the counts will be wrong.
1678 ResourceMark rm(THREAD);
1679 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1680 int num_methods = 0;
1681
1682 // Select methods matching the criteria.
1683 for (int i = 0; i < methods_length; i++) {
1684 Method* method = methods->at(i);
1685 if (want_constructor && !method->is_object_initializer()) {
1686 continue;
1687 }
1688 if (!want_constructor &&
1689 (method->is_object_initializer() || method->is_static_initializer() ||
1690 method->is_overpass())) {
1691 continue;
1692 }
1693 if (publicOnly && !method->is_public()) {
1694 continue;
1695 }
1696 idnums->push(method->method_idnum());
1697 ++num_methods;
1698 }
1699
1700 // Allocate result
1701 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1702 objArrayHandle result (THREAD, r);
1703
1704 // Now just put the methods that we selected above, but go by their idnum
1705 // in case of redefinition. The methods can be redefined at any safepoint,
1706 // so above when allocating the oop array and below when creating reflect
1707 // objects.
1708 for (int i = 0; i < num_methods; i++) {
1709 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1710 if (method.is_null()) {
1711 // Method may have been deleted and seems this API can handle null
1712 // Otherwise should probably put a method that throws NSME
1713 result->obj_at_put(i, nullptr);
1714 } else {
1715 oop m;
1716 if (want_constructor) {
1717 m = Reflection::new_constructor(method, CHECK_NULL);
1718 } else {
1719 m = Reflection::new_method(method, false, CHECK_NULL);
1720 }
1721 result->obj_at_put(i, m);
1722 }
1723 }
1724
1725 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1726 }
1727
1728 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1729 {
1730 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1731 /*want_constructor*/ false,
1732 vmClasses::reflect_Method_klass(), THREAD);
1733 }
1734 JVM_END
1735
1736 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1737 {
1738 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1739 /*want_constructor*/ true,
1740 vmClasses::reflect_Constructor_klass(), THREAD);
1741 }
1742 JVM_END
1743
1744 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1745 {
1746 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1747 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1748 return c->has_nestmate_access_to(m, THREAD);
1749 }
1750 JVM_END
1751
1752 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1753 {
1754 // current is not a primitive or array class
1755 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1756 InstanceKlass* host = c->nest_host(THREAD);
1757 return (jclass) (host == nullptr ? nullptr :
1758 JNIHandles::make_local(THREAD, host->java_mirror()));
1759 }
1760 JVM_END
1761
1762 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1763 {
1764 // current is not a primitive or array class
1765 ResourceMark rm(THREAD);
1766 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1767 InstanceKlass* host = c->nest_host(THREAD);
1768
1769 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1770 c->external_name(), host->external_name());
1771 {
1772 JvmtiVMObjectAllocEventCollector oam;
1773 Array<u2>* members = host->nest_members();
1774 int length = members == nullptr ? 0 : members->length();
1775
1776 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1777
1778 // nest host is first in the array so make it one bigger
1779 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1780 length + 1, CHECK_NULL);
1781 objArrayHandle result(THREAD, r);
1782 result->obj_at_put(0, host->java_mirror());
1783 if (length != 0) {
1784 int count = 0;
1785 for (int i = 0; i < length; i++) {
1786 int cp_index = members->at(i);
1787 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1788 if (HAS_PENDING_EXCEPTION) {
1789 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1790 return nullptr; // propagate VMEs
1791 }
1792 if (log_is_enabled(Trace, class, nestmates)) {
1793 stringStream ss;
1794 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1795 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1796 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1797 log_trace(class, nestmates)("%s", ss.as_string());
1798 }
1799 CLEAR_PENDING_EXCEPTION;
1800 continue;
1801 }
1802 if (k->is_instance_klass()) {
1803 InstanceKlass* ik = InstanceKlass::cast(k);
1804 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1805 if (nest_host_k == host) {
1806 result->obj_at_put(count+1, k->java_mirror());
1807 count++;
1808 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1809 } else {
1810 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1811 ik->external_name(), nest_host_k->external_name());
1812 }
1813 } else {
1814 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1815 k->external_name());
1816 }
1817 }
1818 if (count < length) {
1819 // we had invalid entries so we need to compact the array
1820 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1821 length + 1, count + 1);
1822
1823 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1824 count + 1, CHECK_NULL);
1825 objArrayHandle result2(THREAD, r2);
1826 for (int i = 0; i < count + 1; i++) {
1827 result2->obj_at_put(i, result->obj_at(i));
1828 }
1829 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1830 }
1831 }
1832 else {
1833 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1834 }
1835 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1836 }
1837 }
1838 JVM_END
1839
1840 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1841 {
1842 oop mirror = JNIHandles::resolve_non_null(current);
1843 assert(!java_lang_Class::is_primitive(mirror), "should not be");
1844 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1845
1846 ResourceMark rm(THREAD);
1847 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
1848 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
1849 if (ik->is_sealed()) {
1850 JvmtiVMObjectAllocEventCollector oam;
1851 Array<u2>* subclasses = ik->permitted_subclasses();
1852 int length = subclasses->length();
1853
1854 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
1855
1856 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1857 length, CHECK_NULL);
1858 objArrayHandle result(THREAD, r);
1859 int count = 0;
1860 for (int i = 0; i < length; i++) {
1861 int cp_index = subclasses->at(i);
1862 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
1863 if (HAS_PENDING_EXCEPTION) {
1864 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1865 return nullptr; // propagate VMEs
1866 }
1867 if (log_is_enabled(Trace, class, sealed)) {
1868 stringStream ss;
1869 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
1870 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
1871 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1872 log_trace(class, sealed)("%s", ss.as_string());
1873 }
1874
1875 CLEAR_PENDING_EXCEPTION;
1876 continue;
1877 }
1878 if (k->is_instance_klass()) {
1879 result->obj_at_put(count++, k->java_mirror());
1880 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
1881 }
1882 }
1883 if (count < length) {
1884 // we had invalid entries so we need to compact the array
1885 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1886 count, CHECK_NULL);
1887 objArrayHandle result2(THREAD, r2);
1888 for (int i = 0; i < count; i++) {
1889 result2->obj_at_put(i, result->obj_at(i));
1890 }
1891 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1892 }
1893 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1894 } else {
1895 return nullptr;
1896 }
1897 }
1898 JVM_END
1899
1900 // Constant pool access //////////////////////////////////////////////////////////
1901
1902 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1903 {
1904 JvmtiVMObjectAllocEventCollector oam;
1905 oop mirror = JNIHandles::resolve_non_null(cls);
1906 // Return null for primitives and arrays
1907 if (!java_lang_Class::is_primitive(mirror)) {
1908 Klass* k = java_lang_Class::as_Klass(mirror);
1909 if (k->is_instance_klass()) {
1910 InstanceKlass* k_h = InstanceKlass::cast(k);
1911 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1912 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1913 return JNIHandles::make_local(THREAD, jcp());
1914 }
1915 }
1916 return nullptr;
1917 }
1918 JVM_END
1919
1920
1921 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
1922 {
1923 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1924 return cp->length();
1925 }
1926 JVM_END
1927
1928
1929 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
1930 {
1931 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1932 bounds_check(cp, index, CHECK_NULL);
1933 constantTag tag = cp->tag_at(index);
1934 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1935 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1936 }
1937 Klass* k = cp->klass_at(index, CHECK_NULL);
1938 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1939 }
1940 JVM_END
1941
1942 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1943 {
1944 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1945 bounds_check(cp, index, CHECK_NULL);
1946 constantTag tag = cp->tag_at(index);
1947 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1948 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1949 }
1950 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1951 if (k == nullptr) return nullptr;
1952 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1953 }
1954 JVM_END
1955
1956 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1957 constantTag tag = cp->tag_at(index);
1958 if (!tag.is_method() && !tag.is_interface_method()) {
1959 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1960 }
1961 int klass_ref = cp->uncached_klass_ref_index_at(index);
1962 Klass* k_o;
1963 if (force_resolution) {
1964 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1965 } else {
1966 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1967 if (k_o == nullptr) return nullptr;
1968 }
1969 InstanceKlass* k = InstanceKlass::cast(k_o);
1970 Symbol* name = cp->uncached_name_ref_at(index);
1971 Symbol* sig = cp->uncached_signature_ref_at(index);
1972 methodHandle m (THREAD, k->find_method(name, sig));
1973 if (m.is_null()) {
1974 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1975 }
1976 oop method;
1977 if (m->is_object_initializer()) {
1978 method = Reflection::new_constructor(m, CHECK_NULL);
1979 } else {
1980 // new_method accepts <clinit> as Method here
1981 method = Reflection::new_method(m, true, CHECK_NULL);
1982 }
1983 return JNIHandles::make_local(THREAD, method);
1984 }
1985
1986 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
1987 {
1988 JvmtiVMObjectAllocEventCollector oam;
1989 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1990 bounds_check(cp, index, CHECK_NULL);
1991 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1992 return res;
1993 }
1994 JVM_END
1995
1996 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1997 {
1998 JvmtiVMObjectAllocEventCollector oam;
1999 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2000 bounds_check(cp, index, CHECK_NULL);
2001 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2002 return res;
2003 }
2004 JVM_END
2005
2006 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2007 constantTag tag = cp->tag_at(index);
2008 if (!tag.is_field()) {
2009 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2010 }
2011 int klass_ref = cp->uncached_klass_ref_index_at(index);
2012 Klass* k_o;
2013 if (force_resolution) {
2014 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2015 } else {
2016 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2017 if (k_o == nullptr) return nullptr;
2018 }
2019 InstanceKlass* k = InstanceKlass::cast(k_o);
2020 Symbol* name = cp->uncached_name_ref_at(index);
2021 Symbol* sig = cp->uncached_signature_ref_at(index);
2022 fieldDescriptor fd;
2023 Klass* target_klass = k->find_field(name, sig, &fd);
2024 if (target_klass == nullptr) {
2025 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2026 }
2027 oop field = Reflection::new_field(&fd, CHECK_NULL);
2028 return JNIHandles::make_local(THREAD, field);
2029 }
2030
2031 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2032 {
2033 JvmtiVMObjectAllocEventCollector oam;
2034 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2035 bounds_check(cp, index, CHECK_NULL);
2036 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2037 return res;
2038 }
2039 JVM_END
2040
2041 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2042 {
2043 JvmtiVMObjectAllocEventCollector oam;
2044 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2045 bounds_check(cp, index, CHECK_NULL);
2046 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2047 return res;
2048 }
2049 JVM_END
2050
2051 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2052 {
2053 JvmtiVMObjectAllocEventCollector oam;
2054 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2055 bounds_check(cp, index, CHECK_NULL);
2056 constantTag tag = cp->tag_at(index);
2057 if (!tag.is_field_or_method()) {
2058 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2059 }
2060 int klass_ref = cp->uncached_klass_ref_index_at(index);
2061 Symbol* klass_name = cp->klass_name_at(klass_ref);
2062 Symbol* member_name = cp->uncached_name_ref_at(index);
2063 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2064 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2065 objArrayHandle dest(THREAD, dest_o);
2066 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2067 dest->obj_at_put(0, str());
2068 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2069 dest->obj_at_put(1, str());
2070 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2071 dest->obj_at_put(2, str());
2072 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2073 }
2074 JVM_END
2075
2076 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2077 {
2078 JvmtiVMObjectAllocEventCollector oam;
2079 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2080 bounds_check(cp, index, CHECK_0);
2081 constantTag tag = cp->tag_at(index);
2082 if (!tag.is_field_or_method()) {
2083 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2084 }
2085 return (jint) cp->uncached_klass_ref_index_at(index);
2086 }
2087 JVM_END
2088
2089 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2090 {
2091 JvmtiVMObjectAllocEventCollector oam;
2092 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2093 bounds_check(cp, index, CHECK_0);
2094 constantTag tag = cp->tag_at(index);
2095 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2096 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2097 }
2098 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2099 }
2100 JVM_END
2101
2102 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2103 {
2104 JvmtiVMObjectAllocEventCollector oam;
2105 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2106 bounds_check(cp, index, CHECK_NULL);
2107 constantTag tag = cp->tag_at(index);
2108 if (!tag.is_name_and_type()) {
2109 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2110 }
2111 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2112 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2113 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2114 objArrayHandle dest(THREAD, dest_o);
2115 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2116 dest->obj_at_put(0, str());
2117 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2118 dest->obj_at_put(1, str());
2119 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2120 }
2121 JVM_END
2122
2123 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2124 {
2125 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2126 bounds_check(cp, index, CHECK_0);
2127 constantTag tag = cp->tag_at(index);
2128 if (!tag.is_int()) {
2129 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2130 }
2131 return cp->int_at(index);
2132 }
2133 JVM_END
2134
2135 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2136 {
2137 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2138 bounds_check(cp, index, CHECK_(0L));
2139 constantTag tag = cp->tag_at(index);
2140 if (!tag.is_long()) {
2141 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2142 }
2143 return cp->long_at(index);
2144 }
2145 JVM_END
2146
2147 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2148 {
2149 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2150 bounds_check(cp, index, CHECK_(0.0f));
2151 constantTag tag = cp->tag_at(index);
2152 if (!tag.is_float()) {
2153 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2154 }
2155 return cp->float_at(index);
2156 }
2157 JVM_END
2158
2159 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2160 {
2161 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2162 bounds_check(cp, index, CHECK_(0.0));
2163 constantTag tag = cp->tag_at(index);
2164 if (!tag.is_double()) {
2165 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2166 }
2167 return cp->double_at(index);
2168 }
2169 JVM_END
2170
2171 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2172 {
2173 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2174 bounds_check(cp, index, CHECK_NULL);
2175 constantTag tag = cp->tag_at(index);
2176 if (!tag.is_string()) {
2177 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2178 }
2179 oop str = cp->string_at(index, CHECK_NULL);
2180 return (jstring) JNIHandles::make_local(THREAD, str);
2181 }
2182 JVM_END
2183
2184 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2185 {
2186 JvmtiVMObjectAllocEventCollector oam;
2187 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2188 bounds_check(cp, index, CHECK_NULL);
2189 constantTag tag = cp->tag_at(index);
2190 if (!tag.is_symbol()) {
2191 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2192 }
2193 Symbol* sym = cp->symbol_at(index);
2194 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2195 return (jstring) JNIHandles::make_local(THREAD, str());
2196 }
2197 JVM_END
2198
2199 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2200 {
2201 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2202 bounds_check(cp, index, CHECK_0);
2203 constantTag tag = cp->tag_at(index);
2204 jbyte result = tag.value();
2205 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2206 // they are changed to the corresponding tags from the JVM spec, so that java code in
2207 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2208 if (tag.is_klass_or_reference()) {
2209 result = JVM_CONSTANT_Class;
2210 } else if (tag.is_string_index()) {
2211 result = JVM_CONSTANT_String;
2212 } else if (tag.is_method_type_in_error()) {
2213 result = JVM_CONSTANT_MethodType;
2214 } else if (tag.is_method_handle_in_error()) {
2215 result = JVM_CONSTANT_MethodHandle;
2216 } else if (tag.is_dynamic_constant_in_error()) {
2217 result = JVM_CONSTANT_Dynamic;
2218 }
2219 return result;
2220 }
2221 JVM_END
2222
2223 // Assertion support. //////////////////////////////////////////////////////////
2224
2225 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2226 assert(cls != nullptr, "bad class");
2227
2228 oop r = JNIHandles::resolve(cls);
2229 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2230 if (java_lang_Class::is_primitive(r)) return false;
2231
2232 Klass* k = java_lang_Class::as_Klass(r);
2233 assert(k->is_instance_klass(), "must be an instance klass");
2234 if (!k->is_instance_klass()) return false;
2235
2236 ResourceMark rm(THREAD);
2237 const char* name = k->name()->as_C_string();
2238 bool system_class = k->class_loader() == nullptr;
2239 return JavaAssertions::enabled(name, system_class);
2240
2241 JVM_END
2242
2243
2244 // Return a new AssertionStatusDirectives object with the fields filled in with
2245 // command-line assertion arguments (i.e., -ea, -da).
2246 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2247 JvmtiVMObjectAllocEventCollector oam;
2248 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2249 return JNIHandles::make_local(THREAD, asd);
2250 JVM_END
2251
2252 // Verification ////////////////////////////////////////////////////////////////////////////////
2253
2254 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2255
2256 // RedefineClasses support: bug 6214132 caused verification to fail.
2257 // All functions from this section, unless noted otherwise, should call the functions
2258 // get_klass_considering_redefinition(), or
2259 // get_instance_klass_considering_redefinition()
2260 // These functions return JvmtiThreadState::_scratch_class if the verifier
2261 // was invoked in the middle of the redefinition of cls.
2262 // See jvmtiThreadState.hpp for details.
2263
2264 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2265 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2266 if (k->is_instance_klass()) {
2267 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2268 } else {
2269 return k;
2270 }
2271 }
2272
2273 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2274 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2275 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2276 }
2277
2278 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2279 oop mirror = JNIHandles::resolve_non_null(cls);
2280 if (java_lang_Class::is_primitive(mirror)) {
2281 return JNI_FALSE;
2282 }
2283 Klass* k = java_lang_Class::as_Klass(mirror);
2284 // This isn't necessary since answer is the same because redefinition
2285 // has already checked this matches for the scratch class.
2286 // k = get_klass_considering_redefinition(cls, thread)
2287 jboolean result = k->is_interface();
2288 assert(!result || k->is_instance_klass(),
2289 "all interfaces are instance types");
2290 return result;
2291 JVM_END
2292
2293 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2294 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2295 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2296 return k->name()->as_utf8();
2297 JVM_END
2298
2299
2300 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2301 Klass* k = get_klass_considering_redefinition(cls, thread);
2302 // types will have length zero if this is not an InstanceKlass
2303 // (length is determined by call to JVM_GetClassCPEntriesCount)
2304 if (k->is_instance_klass()) {
2305 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2306 for (int index = cp->length() - 1; index >= 0; index--) {
2307 constantTag tag = cp->tag_at(index);
2308 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2309 }
2310 }
2311 JVM_END
2312
2313
2314 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2315 Klass* k = get_klass_considering_redefinition(cls, thread);
2316 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2317 JVM_END
2318
2319
2320 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2321 Klass* k = get_klass_considering_redefinition(cls, thread);
2322 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2323 JVM_END
2324
2325
2326 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2327 Klass* k = get_klass_considering_redefinition(cls, thread);
2328 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2329 JVM_END
2330
2331
2332 // The following methods, used for the verifier, are never called with
2333 // array klasses, so a direct cast to InstanceKlass is safe.
2334 // Typically, these methods are called in a loop with bounds determined
2335 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2336 // zero for arrays.
2337 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2338 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2339 Method* method = ik->methods()->at(method_index);
2340 int length = method->checked_exceptions_length();
2341 if (length > 0) {
2342 CheckedExceptionElement* table= method->checked_exceptions_start();
2343 for (int i = 0; i < length; i++) {
2344 exceptions[i] = table[i].class_cp_index;
2345 }
2346 }
2347 JVM_END
2348
2349
2350 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2351 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2352 Method* method = ik->methods()->at(method_index);
2353 return method->checked_exceptions_length();
2354 JVM_END
2355
2356
2357 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2358 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2359 Method* method = ik->methods()->at(method_index);
2360 memcpy(code, method->code_base(), method->code_size());
2361 JVM_END
2362
2363
2364 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2365 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2366 Method* method = ik->methods()->at(method_index);
2367 return method->code_size();
2368 JVM_END
2369
2370
2371 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2372 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2373 Method* method = ik->methods()->at(method_index);
2374 ExceptionTable extable(method);
2375 entry->start_pc = extable.start_pc(entry_index);
2376 entry->end_pc = extable.end_pc(entry_index);
2377 entry->handler_pc = extable.handler_pc(entry_index);
2378 entry->catchType = extable.catch_type_index(entry_index);
2379 JVM_END
2380
2381
2382 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2383 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2384 Method* method = ik->methods()->at(method_index);
2385 return method->exception_table_length();
2386 JVM_END
2387
2388
2389 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2390 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2391 Method* method = ik->methods()->at(method_index);
2392 return method->access_flags().as_method_flags();
2393 JVM_END
2394
2395
2396 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2397 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2398 return ik->field_access_flags(field_index);
2399 JVM_END
2400
2401
2402 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2403 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2404 Method* method = ik->methods()->at(method_index);
2405 return method->max_locals();
2406 JVM_END
2407
2408
2409 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2410 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2411 Method* method = ik->methods()->at(method_index);
2412 return method->size_of_parameters();
2413 JVM_END
2414
2415
2416 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2417 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2418 Method* method = ik->methods()->at(method_index);
2419 return method->verifier_max_stack();
2420 JVM_END
2421
2422
2423 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2424 ResourceMark rm(THREAD);
2425 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2426 Method* method = ik->methods()->at(method_index);
2427 return method->name() == vmSymbols::object_initializer_name();
2428 JVM_END
2429
2430
2431 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2432 ResourceMark rm(THREAD);
2433 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2434 Method* method = ik->methods()->at(method_index);
2435 return method->is_overpass();
2436 JVM_END
2437
2438 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2439 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2440 Method* method = ik->methods()->at(method_index);
2441 return method->name()->as_utf8();
2442 JVM_END
2443
2444
2445 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2446 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2447 Method* method = ik->methods()->at(method_index);
2448 return method->signature()->as_utf8();
2449 JVM_END
2450
2451 /**
2452 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2453 * read entries in the constant pool. Since the old verifier always
2454 * works on a copy of the code, it will not see any rewriting that
2455 * may possibly occur in the middle of verification. So it is important
2456 * that nothing it calls tries to use the cpCache instead of the raw
2457 * constant pool, so we must use cp->uncached_x methods when appropriate.
2458 */
2459 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2460 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2461 ConstantPool* cp = ik->constants();
2462 switch (cp->tag_at(cp_index).value()) {
2463 case JVM_CONSTANT_Fieldref:
2464 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2465 default:
2466 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2467 }
2468 ShouldNotReachHere();
2469 return nullptr;
2470 JVM_END
2471
2472
2473 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2474 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2475 ConstantPool* cp = ik->constants();
2476 switch (cp->tag_at(cp_index).value()) {
2477 case JVM_CONSTANT_InterfaceMethodref:
2478 case JVM_CONSTANT_Methodref:
2479 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2480 default:
2481 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2482 }
2483 ShouldNotReachHere();
2484 return nullptr;
2485 JVM_END
2486
2487
2488 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2489 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2490 ConstantPool* cp = ik->constants();
2491 switch (cp->tag_at(cp_index).value()) {
2492 case JVM_CONSTANT_InterfaceMethodref:
2493 case JVM_CONSTANT_Methodref:
2494 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2495 default:
2496 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2497 }
2498 ShouldNotReachHere();
2499 return nullptr;
2500 JVM_END
2501
2502
2503 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2504 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2505 ConstantPool* cp = ik->constants();
2506 switch (cp->tag_at(cp_index).value()) {
2507 case JVM_CONSTANT_Fieldref:
2508 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2509 default:
2510 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2511 }
2512 ShouldNotReachHere();
2513 return nullptr;
2514 JVM_END
2515
2516
2517 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2518 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2519 ConstantPool* cp = ik->constants();
2520 Symbol* classname = cp->klass_name_at(cp_index);
2521 return classname->as_utf8();
2522 JVM_END
2523
2524
2525 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2526 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2527 ConstantPool* cp = ik->constants();
2528 switch (cp->tag_at(cp_index).value()) {
2529 case JVM_CONSTANT_Fieldref: {
2530 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2531 Symbol* classname = cp->klass_name_at(class_index);
2532 return classname->as_utf8();
2533 }
2534 default:
2535 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2536 }
2537 ShouldNotReachHere();
2538 return nullptr;
2539 JVM_END
2540
2541
2542 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2543 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2544 ConstantPool* cp = ik->constants();
2545 switch (cp->tag_at(cp_index).value()) {
2546 case JVM_CONSTANT_Methodref:
2547 case JVM_CONSTANT_InterfaceMethodref: {
2548 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2549 Symbol* classname = cp->klass_name_at(class_index);
2550 return classname->as_utf8();
2551 }
2552 default:
2553 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2554 }
2555 ShouldNotReachHere();
2556 return nullptr;
2557 JVM_END
2558
2559
2560 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2561 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2562 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2563 ConstantPool* cp = ik->constants();
2564 ConstantPool* cp_called = ik_called->constants();
2565 switch (cp->tag_at(cp_index).value()) {
2566 case JVM_CONSTANT_Fieldref: {
2567 Symbol* name = cp->uncached_name_ref_at(cp_index);
2568 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2569 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2570 if (fs.name() == name && fs.signature() == signature) {
2571 return fs.access_flags().as_field_flags();
2572 }
2573 }
2574 return -1;
2575 }
2576 default:
2577 fatal("JVM_GetCPFieldModifiers: illegal constant");
2578 }
2579 ShouldNotReachHere();
2580 return 0;
2581 JVM_END
2582
2583
2584 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2585 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2586 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2587 ConstantPool* cp = ik->constants();
2588 switch (cp->tag_at(cp_index).value()) {
2589 case JVM_CONSTANT_Methodref:
2590 case JVM_CONSTANT_InterfaceMethodref: {
2591 Symbol* name = cp->uncached_name_ref_at(cp_index);
2592 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2593 Array<Method*>* methods = ik_called->methods();
2594 int methods_count = methods->length();
2595 for (int i = 0; i < methods_count; i++) {
2596 Method* method = methods->at(i);
2597 if (method->name() == name && method->signature() == signature) {
2598 return method->access_flags().as_method_flags();
2599 }
2600 }
2601 return -1;
2602 }
2603 default:
2604 fatal("JVM_GetCPMethodModifiers: illegal constant");
2605 }
2606 ShouldNotReachHere();
2607 return 0;
2608 JVM_END
2609
2610
2611 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2612
2613 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2614 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2615 JVM_END
2616
2617
2618 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2619 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2620 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2621 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2622 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2623 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2624 JVM_END
2625
2626 // Printing support //////////////////////////////////////////////////
2627 extern "C" {
2628
2629 ATTRIBUTE_PRINTF(3, 0)
2630 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2631 // Reject count values that are negative signed values converted to
2632 // unsigned; see bug 4399518, 4417214
2633 if ((intptr_t)count <= 0) return -1;
2634
2635 int result = os::vsnprintf(str, count, fmt, args);
2636 if (result > 0 && (size_t)result >= count) {
2637 result = -1;
2638 }
2639
2640 return result;
2641 }
2642
2643 ATTRIBUTE_PRINTF(3, 4)
2644 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2645 va_list args;
2646 int len;
2647 va_start(args, fmt);
2648 len = jio_vsnprintf(str, count, fmt, args);
2649 va_end(args);
2650 return len;
2651 }
2652
2653 ATTRIBUTE_PRINTF(2, 3)
2654 int jio_fprintf(FILE* f, const char *fmt, ...) {
2655 int len;
2656 va_list args;
2657 va_start(args, fmt);
2658 len = jio_vfprintf(f, fmt, args);
2659 va_end(args);
2660 return len;
2661 }
2662
2663 ATTRIBUTE_PRINTF(2, 0)
2664 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2665 if (Arguments::vfprintf_hook() != nullptr) {
2666 return Arguments::vfprintf_hook()(f, fmt, args);
2667 } else {
2668 return vfprintf(f, fmt, args);
2669 }
2670 }
2671
2672 ATTRIBUTE_PRINTF(1, 2)
2673 JNIEXPORT int jio_printf(const char *fmt, ...) {
2674 int len;
2675 va_list args;
2676 va_start(args, fmt);
2677 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2678 va_end(args);
2679 return len;
2680 }
2681
2682 // HotSpot specific jio method
2683 void jio_print(const char* s, size_t len) {
2684 // Try to make this function as atomic as possible.
2685 if (Arguments::vfprintf_hook() != nullptr) {
2686 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2687 } else {
2688 // Make an unused local variable to avoid warning from gcc compiler.
2689 bool dummy = os::write(defaultStream::output_fd(), s, len);
2690 }
2691 }
2692
2693 } // Extern C
2694
2695 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2696
2697 // In most of the JVM thread support functions we need to access the
2698 // thread through a ThreadsListHandle to prevent it from exiting and
2699 // being reclaimed while we try to operate on it. The exceptions to this
2700 // rule are when operating on the current thread, or if the monitor of
2701 // the target java.lang.Thread is locked at the Java level - in both
2702 // cases the target cannot exit.
2703
2704 static void thread_entry(JavaThread* thread, TRAPS) {
2705 HandleMark hm(THREAD);
2706 Handle obj(THREAD, thread->threadObj());
2707 JavaValue result(T_VOID);
2708 JavaCalls::call_virtual(&result,
2709 obj,
2710 vmClasses::Thread_klass(),
2711 vmSymbols::run_method_name(),
2712 vmSymbols::void_method_signature(),
2713 THREAD);
2714 }
2715
2716
2717 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2718 #if INCLUDE_CDS
2719 if (CDSConfig::allow_only_single_java_thread()) {
2720 // During java -Xshare:dump, if we allow multiple Java threads to
2721 // execute in parallel, symbols and classes may be loaded in
2722 // random orders which will make the resulting CDS archive
2723 // non-deterministic.
2724 //
2725 // Lucikly, during java -Xshare:dump, it's important to run only
2726 // the code in the main Java thread (which is NOT started here) that
2727 // creates the module graph, etc. It's safe to not start the other
2728 // threads which are launched by class static initializers
2729 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2730 if (log_is_enabled(Info, aot)) {
2731 ResourceMark rm;
2732 oop t = JNIHandles::resolve_non_null(jthread);
2733 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2734 }
2735 return;
2736 }
2737 #endif
2738 JavaThread *native_thread = nullptr;
2739
2740 // We cannot hold the Threads_lock when we throw an exception,
2741 // due to rank ordering issues. Example: we might need to grab the
2742 // Heap_lock while we construct the exception.
2743 bool throw_illegal_thread_state = false;
2744
2745 // We must release the Threads_lock before we can post a jvmti event
2746 // in Thread::start.
2747 {
2748 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2749 // Ensure that the C++ Thread and OSThread structures aren't freed before
2750 // we operate.
2751 MutexLocker ml(Threads_lock);
2752
2753 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2754 // re-starting an already started thread, so we should usually find
2755 // that the JavaThread is null. However for a JNI attached thread
2756 // there is a small window between the Thread object being created
2757 // (with its JavaThread set) and the update to its threadStatus, so we
2758 // have to check for this
2759 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2760 throw_illegal_thread_state = true;
2761 } else {
2762 jlong size =
2763 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2764 // Allocate the C++ Thread structure and create the native thread. The
2765 // stack size retrieved from java is 64-bit signed, but the constructor takes
2766 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2767 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2768 // - Avoid passing negative values which would result in really large stacks.
2769 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2770 size_t sz = size > 0 ? (size_t) size : 0;
2771 native_thread = new JavaThread(&thread_entry, sz);
2772
2773 // At this point it may be possible that no osthread was created for the
2774 // JavaThread due to lack of memory. Check for this situation and throw
2775 // an exception if necessary. Eventually we may want to change this so
2776 // that we only grab the lock if the thread was created successfully -
2777 // then we can also do this check and throw the exception in the
2778 // JavaThread constructor.
2779 if (native_thread->osthread() != nullptr) {
2780 // Note: the current thread is not being used within "prepare".
2781 native_thread->prepare(jthread);
2782 }
2783 }
2784 }
2785
2786 if (throw_illegal_thread_state) {
2787 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2788 }
2789
2790 assert(native_thread != nullptr, "Starting null thread?");
2791
2792 if (native_thread->osthread() == nullptr) {
2793 ResourceMark rm(thread);
2794 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2795 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2796 // No one should hold a reference to the 'native_thread'.
2797 native_thread->smr_delete();
2798 if (JvmtiExport::should_post_resource_exhausted()) {
2799 JvmtiExport::post_resource_exhausted(
2800 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2801 os::native_thread_creation_failed_msg());
2802 }
2803 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2804 os::native_thread_creation_failed_msg());
2805 }
2806
2807 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2808
2809 Thread::start(native_thread);
2810
2811 JVM_END
2812
2813
2814 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2815 ThreadsListHandle tlh(thread);
2816 oop java_thread = nullptr;
2817 JavaThread* receiver = nullptr;
2818 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2819 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2820
2821 if (is_alive) {
2822 // jthread refers to a live JavaThread.
2823 Thread::set_priority(receiver, (ThreadPriority)prio);
2824 }
2825 // Implied else: If the JavaThread hasn't started yet, then the
2826 // priority set in the java.lang.Thread object above will be pushed
2827 // down when it does start.
2828 JVM_END
2829
2830
2831 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2832 HOTSPOT_THREAD_YIELD();
2833 os::naked_yield();
2834 JVM_END
2835
2836 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2837 if (nanos < 0) {
2838 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2839 }
2840
2841 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2842 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2843 }
2844
2845 // Save current thread state and restore it at the end of this block.
2846 // And set new thread state to SLEEPING.
2847 JavaThreadSleepState jtss(thread);
2848
2849 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
2850
2851 if (nanos == 0) {
2852 os::naked_yield();
2853 } else {
2854 ThreadState old_state = thread->osthread()->get_state();
2855 thread->osthread()->set_state(SLEEPING);
2856 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
2857 // An asynchronous exception could have been thrown on
2858 // us while we were sleeping. We do not overwrite those.
2859 if (!HAS_PENDING_EXCEPTION) {
2860 HOTSPOT_THREAD_SLEEP_END(1);
2861 if (!thread->has_async_exception_condition()) {
2862 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2863 // to properly restore the thread state. That's likely wrong.
2864 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2865 }
2866 }
2867 }
2868 thread->osthread()->set_state(old_state);
2869 }
2870 HOTSPOT_THREAD_SLEEP_END(0);
2871 JVM_END
2872
2873 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
2874 oop jthread = thread->threadObj();
2875 assert(jthread != nullptr, "no current carrier thread!");
2876 return JNIHandles::make_local(THREAD, jthread);
2877 JVM_END
2878
2879 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2880 oop theThread = thread->vthread();
2881 assert(theThread != (oop)nullptr, "no current thread!");
2882 return JNIHandles::make_local(THREAD, theThread);
2883 JVM_END
2884
2885 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
2886 jobject theThread))
2887 oop threadObj = JNIHandles::resolve(theThread);
2888 thread->set_vthread(threadObj);
2889
2890 // Set _monitor_owner_id of new current Thread
2891 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
2892
2893 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
2894 JVM_END
2895
2896 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
2897 return ThreadIdentifier::unsafe_offset();
2898 JVM_END
2899
2900 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2901 ThreadsListHandle tlh(thread);
2902 JavaThread* receiver = nullptr;
2903 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
2904 if (is_alive) {
2905 // jthread refers to a live JavaThread.
2906 receiver->interrupt();
2907 }
2908 JVM_END
2909
2910 // Return true iff the current thread has locked the object passed in
2911
2912 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
2913 if (obj == nullptr) {
2914 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
2915 }
2916 Handle h_obj(THREAD, JNIHandles::resolve(obj));
2917 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
2918 JVM_END
2919
2920 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
2921 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
2922 return JNIHandles::make_local(THREAD, trace);
2923 JVM_END
2924
2925 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
2926 #if INCLUDE_JVMTI
2927 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
2928 return JNIHandles::make_local(THREAD, snapshot);
2929 #else
2930 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
2931 #endif
2932 JVM_END
2933
2934 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
2935 // We don't use a ThreadsListHandle here because the current thread
2936 // must be alive.
2937 oop java_thread = JNIHandles::resolve_non_null(jthread);
2938 JavaThread* thr = java_lang_Thread::thread(java_thread);
2939 if (thread == thr && !thr->has_attached_via_jni()) {
2940 // Thread naming is only supported for the current thread and
2941 // we don't set the name of an attached thread to avoid stepping
2942 // on other programs.
2943 ResourceMark rm(thread);
2944 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2945 os::set_native_thread_name(thread_name);
2946 }
2947 JVM_END
2948
2949 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
2950 oop theCache = thread->scopedValueCache();
2951 return JNIHandles::make_local(THREAD, theCache);
2952 JVM_END
2953
2954 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
2955 jobject theCache))
2956 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
2957 thread->set_scopedValueCache(objs);
2958 JVM_END
2959
2960
2961 // java.lang.Package ////////////////////////////////////////////////////////////////
2962
2963
2964 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
2965 ResourceMark rm(THREAD);
2966 JvmtiVMObjectAllocEventCollector oam;
2967 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2968 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
2969 return (jstring) JNIHandles::make_local(THREAD, result);
2970 JVM_END
2971
2972
2973 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
2974 JvmtiVMObjectAllocEventCollector oam;
2975 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
2976 return (jobjectArray) JNIHandles::make_local(THREAD, result);
2977 JVM_END
2978
2979
2980 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
2981
2982
2983 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
2984 MonitorLocker ml(Heap_lock);
2985 oop ref = Universe::reference_pending_list();
2986 if (ref != nullptr) {
2987 Universe::clear_reference_pending_list();
2988 }
2989 return JNIHandles::make_local(THREAD, ref);
2990 JVM_END
2991
2992 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
2993 MonitorLocker ml(Heap_lock);
2994 return Universe::has_reference_pending_list();
2995 JVM_END
2996
2997 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
2998 MonitorLocker ml(Heap_lock);
2999 while (!Universe::has_reference_pending_list()) {
3000 ml.wait();
3001 }
3002 JVM_END
3003
3004 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3005 oop ref_oop = JNIHandles::resolve_non_null(ref);
3006 // PhantomReference has its own implementation of get().
3007 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3008 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3009 return JNIHandles::make_local(THREAD, referent);
3010 JVM_END
3011
3012 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3013 oop ref_oop = JNIHandles::resolve_non_null(ref);
3014 // PhantomReference has its own implementation of refersTo().
3015 // See: JVM_PhantomReferenceRefersTo
3016 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3017 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3018 return referent == JNIHandles::resolve(o);
3019 JVM_END
3020
3021 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3022 oop ref_oop = JNIHandles::resolve_non_null(ref);
3023 // FinalReference has it's own implementation of clear().
3024 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3025 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3026 // If the referent has already been cleared then done.
3027 // However, if the referent is dead but has not yet been cleared by
3028 // concurrent reference processing, it should NOT be cleared here.
3029 // Instead, clearing should be left to the GC. Clearing it here could
3030 // detectably lose an expected notification, which is impossible with
3031 // STW reference processing. The clearing in enqueue() doesn't have
3032 // this problem, since the enqueue covers the notification, but it's not
3033 // worth the effort to handle that case specially.
3034 return;
3035 }
3036 java_lang_ref_Reference::clear_referent(ref_oop);
3037 JVM_END
3038
3039
3040 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3041
3042
3043 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3044 oop ref_oop = JNIHandles::resolve_non_null(ref);
3045 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3046 return referent == JNIHandles::resolve(o);
3047 JVM_END
3048
3049
3050 // ObjectInputStream ///////////////////////////////////////////////////////////////
3051
3052 // Return the first user-defined class loader up the execution stack, or null
3053 // if only code from the bootstrap or platform class loader is on the stack.
3054
3055 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3056 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3057 InstanceKlass* ik = vfst.method()->method_holder();
3058 oop loader = ik->class_loader();
3059 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3060 return JNIHandles::make_local(THREAD, loader);
3061 }
3062 }
3063 return nullptr;
3064 JVM_END
3065
3066
3067 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3068
3069
3070 // resolve array handle and check arguments
3071 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3072 if (arr == nullptr) {
3073 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3074 }
3075 oop a = JNIHandles::resolve_non_null(arr);
3076 if (!a->is_array()) {
3077 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3078 } else if (type_array_only && !a->is_typeArray()) {
3079 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3080 }
3081 return arrayOop(a);
3082 }
3083
3084
3085 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3086 arrayOop a = check_array(env, arr, false, CHECK_0);
3087 return a->length();
3088 JVM_END
3089
3090
3091 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3092 JvmtiVMObjectAllocEventCollector oam;
3093 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3094 jvalue value;
3095 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3096 oop box = Reflection::box(&value, type, CHECK_NULL);
3097 return JNIHandles::make_local(THREAD, box);
3098 JVM_END
3099
3100
3101 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3102 jvalue value;
3103 value.i = 0; // to initialize value before getting used in CHECK
3104 arrayOop a = check_array(env, arr, true, CHECK_(value));
3105 assert(a->is_typeArray(), "just checking");
3106 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3107 BasicType wide_type = (BasicType) wCode;
3108 if (type != wide_type) {
3109 Reflection::widen(&value, type, wide_type, CHECK_(value));
3110 }
3111 return value;
3112 JVM_END
3113
3114
3115 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3116 arrayOop a = check_array(env, arr, false, CHECK);
3117 oop box = JNIHandles::resolve(val);
3118 jvalue value;
3119 value.i = 0; // to initialize value before getting used in CHECK
3120 BasicType value_type;
3121 if (a->is_objArray()) {
3122 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3123 value_type = Reflection::unbox_for_regular_object(box, &value);
3124 } else {
3125 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3126 }
3127 Reflection::array_set(&value, a, index, value_type, CHECK);
3128 JVM_END
3129
3130
3131 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3132 arrayOop a = check_array(env, arr, true, CHECK);
3133 assert(a->is_typeArray(), "just checking");
3134 BasicType value_type = (BasicType) vCode;
3135 Reflection::array_set(&v, a, index, value_type, CHECK);
3136 JVM_END
3137
3138
3139 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3140 JvmtiVMObjectAllocEventCollector oam;
3141 oop element_mirror = JNIHandles::resolve(eltClass);
3142 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3143 return JNIHandles::make_local(THREAD, result);
3144 JVM_END
3145
3146
3147 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3148 JvmtiVMObjectAllocEventCollector oam;
3149 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3150 oop element_mirror = JNIHandles::resolve(eltClass);
3151 assert(dim_array->is_typeArray(), "just checking");
3152 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3153 return JNIHandles::make_local(THREAD, result);
3154 JVM_END
3155
3156
3157 // Library support ///////////////////////////////////////////////////////////////////////////
3158
3159 JVM_LEAF(void*, JVM_LoadZipLibrary())
3160 return ZipLibrary::handle();
3161 JVM_END
3162
3163 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3164 //%note jvm_ct
3165 char ebuf[1024];
3166 void *load_result;
3167 {
3168 ThreadToNativeFromVM ttnfvm(thread);
3169 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3170 }
3171 if (load_result == nullptr) {
3172 if (throwException) {
3173 char msg[1024];
3174 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3175 // Since 'ebuf' may contain a string encoded using
3176 // platform encoding scheme, we need to pass
3177 // Exceptions::unsafe_to_utf8 to the new_exception method
3178 // as the last argument. See bug 6367357.
3179 Handle h_exception =
3180 Exceptions::new_exception(thread,
3181 vmSymbols::java_lang_UnsatisfiedLinkError(),
3182 msg, Exceptions::unsafe_to_utf8);
3183
3184 THROW_HANDLE_NULL(h_exception);
3185 } else {
3186 log_info(library)("Failed to load library %s", name);
3187 return load_result;
3188 }
3189 }
3190 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3191 return load_result;
3192 JVM_END
3193
3194
3195 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3196 os::dll_unload(handle);
3197 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3198 JVM_END
3199
3200
3201 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3202 void* find_result = os::dll_lookup(handle, name);
3203 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3204 find_result != nullptr ? "Found" : "Failed to find",
3205 name, p2i(handle));
3206 return find_result;
3207 JVM_END
3208
3209
3210 // JNI version ///////////////////////////////////////////////////////////////////////////////
3211
3212 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3213 return Threads::is_supported_jni_version_including_1_1(version);
3214 JVM_END
3215
3216
3217 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3218 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3219 JVM_END
3220
3221 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3222 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3223 JVM_END
3224
3225 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3226 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3227 JVM_END
3228
3229 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3230 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3231 JVM_END
3232
3233 // String support ///////////////////////////////////////////////////////////////////////////
3234
3235 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3236 JvmtiVMObjectAllocEventCollector oam;
3237 if (str == nullptr) return nullptr;
3238 oop string = JNIHandles::resolve_non_null(str);
3239 oop result = StringTable::intern(string, CHECK_NULL);
3240 return (jstring) JNIHandles::make_local(THREAD, result);
3241 JVM_END
3242
3243
3244 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3245
3246 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3247 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3248 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3249 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3250 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3251 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3252
3253
3254 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3255 VM_Exit::block_if_vm_exited();
3256 return new PlatformMutex();
3257 }
3258
3259
3260 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3261 VM_Exit::block_if_vm_exited();
3262 delete ((PlatformMutex*) mon);
3263 }
3264
3265
3266 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3267 VM_Exit::block_if_vm_exited();
3268 ((PlatformMutex*) mon)->lock();
3269 return 0;
3270 }
3271
3272
3273 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3274 VM_Exit::block_if_vm_exited();
3275 ((PlatformMutex*) mon)->unlock();
3276 }
3277
3278
3279 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3280
3281 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3282 Handle loader, jboolean throwError, TRAPS) {
3283 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3284
3285 // Check if we should initialize the class
3286 if (init && klass->is_instance_klass()) {
3287 klass->initialize(CHECK_NULL);
3288 }
3289 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3290 }
3291
3292
3293 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3294
3295 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3296 Handle method_handle;
3297 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3298 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3299 Handle receiver(THREAD, JNIHandles::resolve(obj));
3300 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3301 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3302 jobject res = JNIHandles::make_local(THREAD, result);
3303 if (JvmtiExport::should_post_vm_object_alloc()) {
3304 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3305 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3306 if (java_lang_Class::is_primitive(ret_type)) {
3307 // Only for primitive type vm allocates memory for java object.
3308 // See box() method.
3309 JvmtiExport::post_vm_object_alloc(thread, result);
3310 }
3311 }
3312 return res;
3313 } else {
3314 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3315 }
3316 JVM_END
3317
3318
3319 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3320 oop constructor_mirror = JNIHandles::resolve(c);
3321 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3322 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3323 jobject res = JNIHandles::make_local(THREAD, result);
3324 if (JvmtiExport::should_post_vm_object_alloc()) {
3325 JvmtiExport::post_vm_object_alloc(thread, result);
3326 }
3327 return res;
3328 JVM_END
3329
3330 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3332 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3333 JVM_END
3334
3335 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3336 jclass caller,
3337 jstring interfaceMethodName,
3338 jobject factoryType,
3339 jobject interfaceMethodType,
3340 jobject implementationMember,
3341 jobject dynamicMethodType,
3342 jclass lambdaProxyClass))
3343 #if INCLUDE_CDS
3344 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3345 return;
3346 }
3347
3348 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3349 if (caller_ik->is_hidden()) {
3350 // Hidden classes not of type lambda proxy classes are currently not being archived.
3351 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3352 // registered for archiving.
3353 return;
3354 }
3355 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3356 assert(lambda_ik->is_hidden(), "must be a hidden class");
3357 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3358
3359 Symbol* interface_method_name = nullptr;
3360 if (interfaceMethodName != nullptr) {
3361 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3362 }
3363 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3364 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3365
3366 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3367 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3368
3369 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3370 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3371 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3372
3373 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3374 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3375
3376 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3377 interface_method_type, m, dynamic_method_type, THREAD);
3378 #endif // INCLUDE_CDS
3379 JVM_END
3380
3381 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3382 jclass caller,
3383 jstring interfaceMethodName,
3384 jobject factoryType,
3385 jobject interfaceMethodType,
3386 jobject implementationMember,
3387 jobject dynamicMethodType))
3388 #if INCLUDE_CDS
3389
3390 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3391 implementationMember == nullptr || dynamicMethodType == nullptr) {
3392 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3393 }
3394
3395 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3396 if (!caller_ik->in_aot_cache()) {
3397 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3398 return nullptr;
3399 }
3400
3401 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3402 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3403 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3404
3405 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3406 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3407
3408 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3409 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3410 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3411
3412 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3413 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3414
3415 InstanceKlass* loaded_lambda =
3416 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3417 interface_method_type, m, dynamic_method_type,
3418 CHECK_(nullptr));
3419 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3420 #else
3421 return nullptr;
3422 #endif // INCLUDE_CDS
3423 JVM_END
3424
3425 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3426 if (CDSConfig::is_dumping_static_archive()) {
3427 // We do this so that the default CDS archive can be deterministic.
3428 const char* release = VM_Version::vm_release();
3429 const char* dbg_level = VM_Version::jdk_debug_level();
3430 const char* version = VM_Version::internal_vm_info_string();
3431 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3432 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3433 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3434 seed += (jlong)VM_Version::vm_major_version();
3435 seed += (jlong)VM_Version::vm_minor_version();
3436 seed += (jlong)VM_Version::vm_security_version();
3437 seed += (jlong)VM_Version::vm_patch_version();
3438 if (seed == 0) { // don't let this ever be zero.
3439 seed = 0x87654321;
3440 }
3441 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3442 return seed;
3443 } else {
3444 return 0;
3445 }
3446 JVM_END
3447
3448 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3449 return CDSConfig::get_status();
3450 JVM_END
3451
3452 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3453 #if INCLUDE_CDS
3454 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3455 if (line != nullptr) {
3456 ResourceMark rm(THREAD);
3457 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3458 char* c_line = java_lang_String::as_utf8_string(h_line());
3459 if (CDSConfig::is_dumping_dynamic_archive()) {
3460 // Note: LambdaFormInvokers::append take same format which is not
3461 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3462 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3463 }
3464 if (ClassListWriter::is_enabled()) {
3465 ClassListWriter w;
3466 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3467 }
3468 }
3469 #endif // INCLUDE_CDS
3470 JVM_END
3471
3472 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3473 #if INCLUDE_CDS
3474 ResourceMark rm(THREAD);
3475 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3476 char* file_name = java_lang_String::as_utf8_string(file_handle());
3477 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3478 #endif // INCLUDE_CDS
3479 JVM_END
3480
3481 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3482 #if INCLUDE_CDS
3483 ResourceMark rm(THREAD);
3484 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3485 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3486 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3487 #endif // INCLUDE_CDS
3488 JVM_END
3489
3490 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3491 #if INCLUDE_CDS
3492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3493 if (!k->is_instance_klass()) {
3494 return false;
3495 } else {
3496 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3497 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3498 // This class will be cached in AOT-initialized state. No need for init barriers.
3499 return false;
3500 } else {
3501 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3502 // must emit barriers to ensure class initialization during production run.
3503 ResourceMark rm(THREAD);
3504 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3505 return true;
3506 }
3507 }
3508 #else
3509 return false;
3510 #endif // INCLUDE_CDS
3511 JVM_END
3512
3513 // Returns an array of all live Thread objects (VM internal JavaThreads,
3514 // jvmti agent threads, and JNI attaching threads are skipped)
3515 // See CR 6404306 regarding JNI attaching threads
3516 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3517 ResourceMark rm(THREAD);
3518 ThreadsListEnumerator tle(THREAD, false, false);
3519 JvmtiVMObjectAllocEventCollector oam;
3520
3521 int num_threads = tle.num_threads();
3522 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3523 objArrayHandle threads_ah(THREAD, r);
3524
3525 for (int i = 0; i < num_threads; i++) {
3526 Handle h = tle.get_threadObj(i);
3527 threads_ah->obj_at_put(i, h());
3528 }
3529
3530 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3531 JVM_END
3532
3533
3534 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3535 // Return StackTraceElement[][], each element is the stack trace of a thread in
3536 // the corresponding entry in the given threads array
3537 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3538 JvmtiVMObjectAllocEventCollector oam;
3539
3540 // Check if threads is null
3541 if (threads == nullptr) {
3542 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3543 }
3544
3545 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3546 objArrayHandle ah(THREAD, a);
3547 int num_threads = ah->length();
3548 // check if threads is non-empty array
3549 if (num_threads == 0) {
3550 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3551 }
3552
3553 // check if threads is not an array of objects of Thread class
3554 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3555 if (k != vmClasses::Thread_klass()) {
3556 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3557 }
3558
3559 ResourceMark rm(THREAD);
3560
3561 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3562 for (int i = 0; i < num_threads; i++) {
3563 oop thread_obj = ah->obj_at(i);
3564 instanceHandle h(THREAD, (instanceOop) thread_obj);
3565 thread_handle_array->append(h);
3566 }
3567
3568 // The JavaThread references in thread_handle_array are validated
3569 // in VM_ThreadDump::doit().
3570 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3571 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3572
3573 JVM_END
3574
3575 // JVM monitoring and management support
3576 JVM_LEAF(void*, JVM_GetManagement(jint version))
3577 return Management::get_jmm_interface(version);
3578 JVM_END
3579
3580 // com.sun.tools.attach.VirtualMachine agent properties support
3581 //
3582 // Initialize the agent properties with the properties maintained in the VM
3583 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3584 ResourceMark rm;
3585
3586 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3587
3588 PUTPROP(props, "sun.java.command", Arguments::java_command());
3589 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3590 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3591 return properties;
3592 JVM_END
3593
3594 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3595 {
3596 JvmtiVMObjectAllocEventCollector oam;
3597
3598 if (ofClass == nullptr) {
3599 return nullptr;
3600 }
3601 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3602 // Special handling for primitive objects
3603 if (java_lang_Class::is_primitive(mirror())) {
3604 return nullptr;
3605 }
3606 Klass* k = java_lang_Class::as_Klass(mirror());
3607 if (!k->is_instance_klass()) {
3608 return nullptr;
3609 }
3610 InstanceKlass* ik = InstanceKlass::cast(k);
3611 int encl_method_class_idx = ik->enclosing_method_class_index();
3612 if (encl_method_class_idx == 0) {
3613 return nullptr;
3614 }
3615 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3616 objArrayHandle dest(THREAD, dest_o);
3617 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3618 dest->obj_at_put(0, enc_k->java_mirror());
3619 int encl_method_method_idx = ik->enclosing_method_method_index();
3620 if (encl_method_method_idx != 0) {
3621 Symbol* sym = ik->constants()->symbol_at(
3622 extract_low_short_from_int(
3623 ik->constants()->name_and_type_at(encl_method_method_idx)));
3624 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3625 dest->obj_at_put(1, str());
3626 sym = ik->constants()->symbol_at(
3627 extract_high_short_from_int(
3628 ik->constants()->name_and_type_at(encl_method_method_idx)));
3629 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3630 dest->obj_at_put(2, str());
3631 }
3632 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3633 }
3634 JVM_END
3635
3636 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3637 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3638 ResourceMark rm(THREAD);
3639
3640 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3641 return nullptr;
3642 }
3643
3644 char** vm_flags = Arguments::jvm_flags_array();
3645 char** vm_args = Arguments::jvm_args_array();
3646 int num_flags = Arguments::num_jvm_flags();
3647 int num_args = Arguments::num_jvm_args();
3648
3649 InstanceKlass* ik = vmClasses::String_klass();
3650 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3651 objArrayHandle result_h(THREAD, r);
3652
3653 int index = 0;
3654 for (int j = 0; j < num_flags; j++, index++) {
3655 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3656 result_h->obj_at_put(index, h());
3657 }
3658 for (int i = 0; i < num_args; i++, index++) {
3659 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3660 result_h->obj_at_put(index, h());
3661 }
3662 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3663 JVM_END
3664
3665 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3666 return os::get_signal_number(name);
3667 JVM_END
3668
3669 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3670 #if INCLUDE_JVMTI
3671 if (!DoJVMTIVirtualThreadTransitions) {
3672 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3673 return;
3674 }
3675 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3676 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3677 } else {
3678 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3679 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3680 }
3681 #endif
3682 JVM_END
3683
3684 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3685 #if INCLUDE_JVMTI
3686 if (!DoJVMTIVirtualThreadTransitions) {
3687 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3688 return;
3689 }
3690 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3691 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3692 } else {
3693 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3694 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3695 }
3696 #endif
3697 JVM_END
3698
3699 // If notifications are disabled then just update the VTMS transition bit and return.
3700 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3701 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3702 #if INCLUDE_JVMTI
3703 if (!DoJVMTIVirtualThreadTransitions) {
3704 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3705 return;
3706 }
3707 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3708 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3709 } else {
3710 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3711 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3712 }
3713 #endif
3714 JVM_END
3715
3716 // If notifications are disabled then just update the VTMS transition bit and return.
3717 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3718 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3719 #if INCLUDE_JVMTI
3720 if (!DoJVMTIVirtualThreadTransitions) {
3721 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3722 return;
3723 }
3724 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3725 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3726 } else {
3727 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3728 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3729 }
3730 #endif
3731 JVM_END
3732
3733 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3734 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3735 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3736 #if INCLUDE_JVMTI
3737 if (!DoJVMTIVirtualThreadTransitions) {
3738 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3739 return;
3740 }
3741 assert(thread->is_disable_suspend() != (bool)enter,
3742 "nested or unbalanced monitor enter/exit is not allowed");
3743 thread->toggle_is_disable_suspend();
3744 #endif
3745 JVM_END
3746
3747 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3748 #if INCLUDE_JFR
3749 freeze_result result = THREAD->last_freeze_fail_result();
3750 assert(result != freeze_ok, "sanity check");
3751 EventVirtualThreadPinned event(UNTIMED);
3752 event.set_starttime(THREAD->last_freeze_fail_time());
3753 if (event.should_commit()) {
3754 ResourceMark rm(THREAD);
3755 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3756 THREAD->post_vthread_pinned_event(&event, str, result);
3757 }
3758 #endif
3759 JVM_END
3760
3761 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3762 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3763 assert(parkEvent != nullptr, "not initialized");
3764
3765 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3766 oop vthread_head = nullptr;
3767 while (true) {
3768 if (list_head.peek() != nullptr) {
3769 for (;;) {
3770 oop head = list_head.resolve();
3771 if (list_head.cmpxchg(head, nullptr) == head) {
3772 return JNIHandles::make_local(THREAD, head);
3773 }
3774 }
3775 }
3776 ThreadBlockInVM tbivm(THREAD);
3777 parkEvent->park();
3778 }
3779 JVM_END
3780 /*
3781 * Return the current class's class file version. The low order 16 bits of the
3782 * returned jint contain the class's major version. The high order 16 bits
3783 * contain the class's minor version.
3784 */
3785 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3786 oop mirror = JNIHandles::resolve_non_null(current);
3787 if (java_lang_Class::is_primitive(mirror)) {
3788 // return latest major version and minor version of 0.
3789 return JVM_CLASSFILE_MAJOR_VERSION;
3790 }
3791 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3792 return (ik->minor_version() << 16) | ik->major_version();
3793 JVM_END
3794
3795 /*
3796 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3797 * get the value will see a materialized value and not a scalar-replaced
3798 * null value.
3799 */
3800 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3801 JVM_EnsureMaterializedForStackWalk(env, value);
3802 JVM_END
3803
3804 /*
3805 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3806 */
3807 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3808 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3809 JVM_END