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