1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/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 "cds/lambdaProxyClassDictionary.hpp"
33 #include "classfile/classFileStream.hpp"
34 #include "classfile/classLoader.inline.hpp"
35 #include "classfile/classLoaderData.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/method.hpp"
64 #include "oops/recordComponent.hpp"
65 #include "oops/objArrayKlass.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/oop.inline.hpp"
68 #include "prims/foreignGlobals.hpp"
69 #include "prims/jvm_misc.hpp"
70 #include "prims/jvmtiExport.hpp"
71 #include "prims/jvmtiThreadState.inline.hpp"
72 #include "prims/stackwalk.hpp"
73 #include "runtime/arguments.hpp"
74 #include "runtime/atomic.hpp"
75 #include "runtime/continuation.hpp"
76 #include "runtime/globals_extension.hpp"
77 #include "runtime/handles.inline.hpp"
78 #include "runtime/init.hpp"
79 #include "runtime/interfaceSupport.inline.hpp"
80 #include "runtime/deoptimization.hpp"
81 #include "runtime/handshake.hpp"
82 #include "runtime/java.hpp"
83 #include "runtime/javaCalls.hpp"
84 #include "runtime/javaThread.hpp"
85 #include "runtime/jfieldIDWorkaround.hpp"
86 #include "runtime/jniHandles.inline.hpp"
87 #include "runtime/os.inline.hpp"
88 #include "runtime/osThread.hpp"
89 #include "runtime/perfData.hpp"
90 #include "runtime/reflection.hpp"
91 #include "runtime/synchronizer.hpp"
92 #include "runtime/threadIdentifier.hpp"
93 #include "runtime/threadSMR.hpp"
94 #include "runtime/vframe.inline.hpp"
95 #include "runtime/vmOperations.hpp"
96 #include "runtime/vm_version.hpp"
97 #include "services/attachListener.hpp"
98 #include "services/management.hpp"
99 #include "services/threadService.hpp"
100 #include "utilities/checkedCast.hpp"
101 #include "utilities/copy.hpp"
102 #include "utilities/defaultStream.hpp"
103 #include "utilities/dtrace.hpp"
104 #include "utilities/events.hpp"
105 #include "utilities/macros.hpp"
106 #include "utilities/utf8.hpp"
107 #include "utilities/zipLibrary.hpp"
108 #if INCLUDE_CDS
109 #include "classfile/systemDictionaryShared.hpp"
110 #endif
111 #if INCLUDE_JFR
112 #include "jfr/jfr.hpp"
113 #endif
114 #if INCLUDE_MANAGEMENT
115 #include "services/finalizerService.hpp"
116 #endif
117 #ifdef LINUX
118 #include "osContainer_linux.hpp"
119 #endif
120
121 #include <errno.h>
122
123 /*
124 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
125 such ctors and calls MUST NOT come between an oop declaration/init and its
126 usage because if objects are move this may cause various memory stomps, bus
127 errors and segfaults. Here is a cookbook for causing so called "naked oop
128 failures":
129
130 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
131 // Object address to be held directly in mirror & not visible to GC
132 oop mirror = JNIHandles::resolve_non_null(ofClass);
133
134 // If this ctor can hit a safepoint, moving objects around, then
135 ComplexConstructor foo;
136
137 // Boom! mirror may point to JUNK instead of the intended object
138 (some dereference of mirror)
139
140 // Here's another call that may block for GC, making mirror stale
141 MutexLocker ml(some_lock);
142
143 // And here's an initializer that can result in a stale oop
144 // all in one step.
145 oop o = call_that_can_throw_exception(TRAPS);
146
147
148 The solution is to keep the oop declaration BELOW the ctor or function
149 call that might cause a GC, do another resolve to reassign the oop, or
150 consider use of a Handle instead of an oop so there is immunity from object
151 motion. But note that the "QUICK" entries below do not have a handlemark
152 and thus can only support use of handles passed in.
153 */
154
155 extern void trace_class_resolution(Klass* to_class) {
156 ResourceMark rm;
157 int line_number = -1;
158 const char * source_file = nullptr;
159 const char * trace = "explicit";
160 InstanceKlass* caller = nullptr;
161 JavaThread* jthread = JavaThread::current();
162 if (jthread->has_last_Java_frame()) {
163 vframeStream vfst(jthread);
164
165 // Scan up the stack skipping ClassLoader frames.
166 Method* last_caller = nullptr;
167
168 while (!vfst.at_end()) {
169 Method* m = vfst.method();
170 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
171 break;
172 }
173 last_caller = m;
174 vfst.next();
175 }
176 // if this is called from Class.forName0 and that is called from Class.forName,
177 // then print the caller of Class.forName. If this is Class.loadClass, then print
178 // that caller, otherwise keep quiet since this should be picked up elsewhere.
179 bool found_it = false;
180 if (!vfst.at_end() &&
181 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
182 vfst.method()->name() == vmSymbols::forName0_name()) {
183 vfst.next();
184 if (!vfst.at_end() &&
185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
186 vfst.method()->name() == vmSymbols::forName_name()) {
187 vfst.next();
188 found_it = true;
189 }
190 } else if (last_caller != nullptr &&
191 last_caller->method_holder()->name() ==
192 vmSymbols::java_lang_ClassLoader() &&
193 last_caller->name() == vmSymbols::loadClass_name()) {
194 found_it = true;
195 } else if (!vfst.at_end()) {
196 if (vfst.method()->is_native()) {
197 // JNI call
198 found_it = true;
199 }
200 }
201 if (found_it && !vfst.at_end()) {
202 // found the caller
203 caller = vfst.method()->method_holder();
204 line_number = vfst.method()->line_number_from_bci(vfst.bci());
205 if (line_number == -1) {
206 // show method name if it's a native method
207 trace = vfst.method()->name_and_sig_as_C_string();
208 }
209 Symbol* s = caller->source_file_name();
210 if (s != nullptr) {
211 source_file = s->as_C_string();
212 }
213 }
214 }
215 if (caller != nullptr) {
216 if (to_class != caller) {
217 const char * from = caller->external_name();
218 const char * to = to_class->external_name();
219 // print in a single call to reduce interleaving between threads
220 if (source_file != nullptr) {
221 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
222 } else {
223 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
224 }
225 }
226 }
227 }
228
229 // java.lang.System //////////////////////////////////////////////////////////////////////
230
231
232 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
233 return os::javaTimeMillis();
234 JVM_END
235
236 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
237 return os::javaTimeNanos();
238 JVM_END
239
240 // The function below is actually exposed by jdk.internal.misc.VM and not
241 // java.lang.System, but we choose to keep it here so that it stays next
242 // to JVM_CurrentTimeMillis and JVM_NanoTime
243
244 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
245 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
246
247 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
248 jlong seconds;
249 jlong nanos;
250
251 os::javaTimeSystemUTC(seconds, nanos);
252
253 // We're going to verify that the result can fit in a long.
254 // For that we need the difference in seconds between 'seconds'
255 // and 'offset_secs' to be such that:
256 // |seconds - offset_secs| < (2^63/10^9)
257 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
258 // which makes |seconds - offset_secs| < 2^33
259 // and we will prefer +/- 2^32 as the maximum acceptable diff
260 // as 2^32 has a more natural feel than 2^33...
261 //
262 // So if |seconds - offset_secs| >= 2^32 - we return a special
263 // sentinel value (-1) which the caller should take as an
264 // exception value indicating that the offset given to us is
265 // too far from range of the current time - leading to too big
266 // a nano adjustment. The caller is expected to recover by
267 // computing a more accurate offset and calling this method
268 // again. (For the record 2^32 secs is ~136 years, so that
269 // should rarely happen)
270 //
271 jlong diff = seconds - offset_secs;
272 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
273 return -1; // sentinel value: the offset is too far off the target
274 }
275
276 // return the adjustment. If you compute a time by adding
277 // this number of nanoseconds along with the number of seconds
278 // in the offset you should get the current UTC time.
279 return (diff * (jlong)1000000000) + nanos;
280 JVM_END
281
282 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
283 jobject dst, jint dst_pos, jint length))
284 // Check if we have null pointers
285 if (src == nullptr || dst == nullptr) {
286 THROW(vmSymbols::java_lang_NullPointerException());
287 }
288 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
289 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
290 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
291 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
292 // Do copy
293 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
294 JVM_END
295
296
297 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
298 JavaValue r(T_OBJECT);
299 // public synchronized Object put(Object key, Object value);
300 HandleMark hm(THREAD);
301 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
302 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
303 JavaCalls::call_virtual(&r,
304 props,
305 vmClasses::Properties_klass(),
306 vmSymbols::put_name(),
307 vmSymbols::object_object_object_signature(),
308 key_str,
309 value_str,
310 THREAD);
311 }
312
313
314 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
315
316 /*
317 * Return all of the system properties in a Java String array with alternating
318 * names and values from the jvm SystemProperty.
319 * Which includes some internal and all commandline -D defined properties.
320 */
321 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
322 ResourceMark rm(THREAD);
323 HandleMark hm(THREAD);
324 int ndx = 0;
325 int fixedCount = 2;
326
327 SystemProperty* p = Arguments::system_properties();
328 int count = Arguments::PropertyList_count(p);
329
330 // Allocate result String array
331 InstanceKlass* ik = vmClasses::String_klass();
332 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
333 objArrayHandle result_h(THREAD, r);
334
335 while (p != nullptr) {
336 const char * key = p->key();
337 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
338 const char * value = p->value();
339 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
340 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
341 result_h->obj_at_put(ndx * 2, key_str());
342 result_h->obj_at_put(ndx * 2 + 1, value_str());
343 ndx++;
344 }
345 p = p->next();
346 }
347
348 // Convert the -XX:MaxDirectMemorySize= command line flag
349 // to the sun.nio.MaxDirectMemorySize property.
350 // Do this after setting user properties to prevent people
351 // from setting the value with a -D option, as requested.
352 // Leave empty if not supplied
353 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
354 char as_chars[256];
355 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
356 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
357 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
358 result_h->obj_at_put(ndx * 2, key_str());
359 result_h->obj_at_put(ndx * 2 + 1, value_str());
360 ndx++;
361 }
362
363 // JVM monitoring and management support
364 // Add the sun.management.compiler property for the compiler's name
365 {
366 #undef CSIZE
367 #if defined(_LP64)
368 #define CSIZE "64-Bit "
369 #else
370 #define CSIZE
371 #endif // 64bit
372
373 #if COMPILER1_AND_COMPILER2
374 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
375 #else
376 #if defined(COMPILER1)
377 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
378 #elif defined(COMPILER2)
379 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
380 #elif INCLUDE_JVMCI
381 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
382 #else
383 const char* compiler_name = "";
384 #endif // compilers
385 #endif // COMPILER1_AND_COMPILER2
386
387 if (*compiler_name != '\0' &&
388 (Arguments::mode() != Arguments::_int)) {
389 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
390 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
391 result_h->obj_at_put(ndx * 2, key_str());
392 result_h->obj_at_put(ndx * 2 + 1, value_str());
393 ndx++;
394 }
395 }
396
397 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
398 JVM_END
399
400
401 /*
402 * Return the temporary directory that the VM uses for the attach
403 * and perf data files.
404 *
405 * It is important that this directory is well-known and the
406 * same for all VM instances. It cannot be affected by configuration
407 * variables such as java.io.tmpdir.
408 */
409 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
410 HandleMark hm(THREAD);
411 const char* temp_dir = os::get_temp_directory();
412 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
413 return (jstring) JNIHandles::make_local(THREAD, h());
414 JVM_END
415
416
417 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
418
419 extern volatile jint vm_created;
420
421 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
422 EventShutdown event;
423 if (event.should_commit()) {
424 event.set_reason("Shutdown requested from Java");
425 event.commit();
426 }
427 JVM_END
428
429
430 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
431 before_exit(thread, true);
432 vm_exit(code);
433 JVM_END
434
435
436 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
437 if (!DisableExplicitGC) {
438 EventSystemGC event;
439 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
440 Universe::heap()->collect(GCCause::_java_lang_system_gc);
441 event.commit();
442 }
443 JVM_END
444
445
446 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
447 return Universe::heap()->millis_since_last_whole_heap_examined();
448 JVM_END
449
450
451 static inline jlong convert_size_t_to_jlong(size_t val) {
452 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
453 NOT_LP64 (return (jlong)val;)
454 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
455 }
456
457 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
458 size_t n = Universe::heap()->capacity();
459 return convert_size_t_to_jlong(n);
460 JVM_END
461
462
463 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
464 size_t n = Universe::heap()->unused();
465 return convert_size_t_to_jlong(n);
466 JVM_END
467
468
469 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
470 size_t n = Universe::heap()->max_capacity();
471 return convert_size_t_to_jlong(n);
472 JVM_END
473
474
475 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
476 return os::active_processor_count();
477 JVM_END
478
479 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
480 #ifdef LINUX
481 if (UseContainerSupport) {
482 return JNI_TRUE;
483 }
484 #endif
485 return JNI_FALSE;
486 JVM_END
487
488 JVM_LEAF(jboolean, JVM_IsContainerized(void))
489 #ifdef LINUX
490 if (OSContainer::is_containerized()) {
491 return JNI_TRUE;
492 }
493 #endif
494 return JNI_FALSE;
495 JVM_END
496
497 // java.lang.Throwable //////////////////////////////////////////////////////
498
499 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
500 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
501 java_lang_Throwable::fill_in_stack_trace(exception);
502 JVM_END
503
504 // java.lang.NullPointerException ///////////////////////////////////////////
505
506 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
507 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
508
509 oop exc = JNIHandles::resolve_non_null(throwable);
510
511 Method* method;
512 int bci;
513 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
514 return nullptr;
515 }
516 if (method->is_native()) {
517 return nullptr;
518 }
519
520 stringStream ss;
521 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
522 if (ok) {
523 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
524 return (jstring) JNIHandles::make_local(THREAD, result);
525 } else {
526 return nullptr;
527 }
528 JVM_END
529
530 // java.lang.StackTraceElement //////////////////////////////////////////////
531
532
533 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
534 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
535 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
536 objArrayHandle stack_trace(THREAD, st);
537 // Fill in the allocated stack trace
538 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
539 JVM_END
540
541
542 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
543 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
544 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
545 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
546 JVM_END
547
548
549 // java.lang.StackWalker //////////////////////////////////////////////////////
550 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
551 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
552
553 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
554 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
555 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
556 if (!have_name) {
557 oop name = StringTable::intern(method->name(), CHECK);
558 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
559 }
560 if (!have_type) {
561 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
562 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
563 }
564 JVM_END
565
566 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
567 jint skip_frames, jobject contScope, jobject cont,
568 jint buffer_size, jint start_index, jobjectArray frames))
569 if (!thread->has_last_Java_frame()) {
570 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
571 }
572
573 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
574 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
575 Handle cont_h(THREAD, JNIHandles::resolve(cont));
576 // frames array is a ClassFrameInfo[] array when only getting caller reference,
577 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
578 // be null.
579 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
580 objArrayHandle frames_array_h(THREAD, fa);
581
582 if (frames_array_h->length() < buffer_size) {
583 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
584 }
585
586 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
587 buffer_size, start_index, frames_array_h, CHECK_NULL);
588 return JNIHandles::make_local(THREAD, result);
589 JVM_END
590
591
592 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
593 jint last_batch_count, jint buffer_size, jint start_index,
594 jobjectArray frames))
595 // frames array is a ClassFrameInfo[] array when only getting caller reference,
596 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
597 // be null.
598 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
599 objArrayHandle frames_array_h(THREAD, fa);
600
601 if (frames_array_h->length() < buffer_size) {
602 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
603 }
604
605 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
606 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
607 start_index, frames_array_h, THREAD);
608 JVM_END
609
610 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
611 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
612 objArrayHandle frames_array_h(THREAD, fa);
613 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
614 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
615
616 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
617 JVM_END
618
619 // java.lang.Object ///////////////////////////////////////////////
620
621
622 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
623 // as implemented in the classic virtual machine; return 0 if object is null
624 return handle == nullptr ? 0 :
625 checked_cast<jint>(ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)));
626 JVM_END
627
628
629 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
630 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
631 ObjectSynchronizer::wait(obj, ms, CHECK);
632 JVM_END
633
634
635 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
636 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
637 ObjectSynchronizer::notify(obj, CHECK);
638 JVM_END
639
640
641 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
642 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
643 ObjectSynchronizer::notifyall(obj, CHECK);
644 JVM_END
645
646
647 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
648 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
649 Klass* klass = obj->klass();
650 JvmtiVMObjectAllocEventCollector oam;
651
652 #ifdef ASSERT
653 // Just checking that the cloneable flag is set correct
654 if (obj->is_array()) {
655 guarantee(klass->is_cloneable(), "all arrays are cloneable");
656 } else {
657 guarantee(obj->is_instance(), "should be instanceOop");
658 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
659 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
660 }
661 #endif
662
663 // Check if class of obj supports the Cloneable interface.
664 // All arrays are considered to be cloneable (See JLS 20.1.5).
665 // All j.l.r.Reference classes are considered non-cloneable.
666 if (!klass->is_cloneable() ||
667 (klass->is_instance_klass() &&
668 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
669 ResourceMark rm(THREAD);
670 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
671 }
672
673 // Make shallow object copy
674 const size_t size = obj->size();
675 oop new_obj_oop = nullptr;
676 if (obj->is_array()) {
677 const int length = ((arrayOop)obj())->length();
678 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
679 /* do_zero */ true, CHECK_NULL);
680 } else {
681 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
682 }
683
684 HeapAccess<>::clone(obj(), new_obj_oop, size);
685
686 Handle new_obj(THREAD, new_obj_oop);
687 // Caution: this involves a java upcall, so the clone should be
688 // "gc-robust" by this stage.
689 if (klass->has_finalizer()) {
690 assert(obj->is_instance(), "should be instanceOop");
691 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
692 new_obj = Handle(THREAD, new_obj_oop);
693 }
694
695 return JNIHandles::make_local(THREAD, new_obj());
696 JVM_END
697
698 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
699
700 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
701 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
702 JVM_END
703
704 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
705 return InstanceKlass::is_finalization_enabled();
706 JVM_END
707
708 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
709
710 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
711 CONT_RegisterNativeMethods(env, cls);
712 JVM_END
713
714 // java.io.File ///////////////////////////////////////////////////////////////
715
716 JVM_LEAF(char*, JVM_NativePath(char* path))
717 return os::native_path(path);
718 JVM_END
719
720
721 // Misc. class handling ///////////////////////////////////////////////////////////
722
723
724 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
725 // Getting the class of the caller frame.
726 //
727 // The call stack at this point looks something like this:
728 //
729 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
730 // [1] [ @CallerSensitive API.method ]
731 // [.] [ (skipped intermediate frames) ]
732 // [n] [ caller ]
733 vframeStream vfst(thread);
734 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
735 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
736 Method* m = vfst.method();
737 assert(m != nullptr, "sanity");
738 switch (n) {
739 case 0:
740 // This must only be called from Reflection.getCallerClass
741 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
742 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
743 }
744 // fall-through
745 case 1:
746 // Frame 0 and 1 must be caller sensitive.
747 if (!m->caller_sensitive()) {
748 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
749 }
750 break;
751 default:
752 if (!m->is_ignored_by_security_stack_walk()) {
753 // We have reached the desired frame; return the holder class.
754 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
755 }
756 break;
757 }
758 }
759 return nullptr;
760 JVM_END
761
762
763 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
764 oop mirror = nullptr;
765 BasicType t = name2type(utf);
766 if (t != T_ILLEGAL && !is_reference_type(t)) {
767 mirror = Universe::java_mirror(t);
768 }
769 if (mirror == nullptr) {
770 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
771 } else {
772 return (jclass) JNIHandles::make_local(THREAD, mirror);
773 }
774 JVM_END
775
776
777 // Returns a class loaded by the bootstrap class loader; or null
778 // if not found. ClassNotFoundException is not thrown.
779 // FindClassFromBootLoader is exported to the launcher for windows.
780 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
781 const char* name))
782 // Java libraries should ensure that name is never null or illegal.
783 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
784 // It's impossible to create this class; the name cannot fit
785 // into the constant pool.
786 return nullptr;
787 }
788 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
789
790 TempNewSymbol h_name = SymbolTable::new_symbol(name);
791 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
792 if (k == nullptr) {
793 return nullptr;
794 }
795
796 if (log_is_enabled(Debug, class, resolve)) {
797 trace_class_resolution(k);
798 }
799 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
800 JVM_END
801
802 // Find a class with this name in this loader, using the caller's protection domain.
803 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
804 jboolean init, jobject loader,
805 jclass caller))
806 TempNewSymbol h_name =
807 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
808 CHECK_NULL);
809
810 oop loader_oop = JNIHandles::resolve(loader);
811 oop from_class = JNIHandles::resolve(caller);
812 Handle h_loader(THREAD, loader_oop);
813
814 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
815 false, THREAD);
816
817 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
818 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
819 }
820 return result;
821 JVM_END
822
823 // Currently only called from the old verifier.
824 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
825 jboolean init, jclass from))
826 TempNewSymbol h_name =
827 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
828 CHECK_NULL);
829 oop from_class_oop = JNIHandles::resolve(from);
830 Klass* from_class = (from_class_oop == nullptr)
831 ? (Klass*)nullptr
832 : java_lang_Class::as_Klass(from_class_oop);
833 oop class_loader = nullptr;
834 if (from_class != nullptr) {
835 class_loader = from_class->class_loader();
836 }
837 Handle h_loader(THREAD, class_loader);
838 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
839
840 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
841 // this function is generally only used for class loading during verification.
842 ResourceMark rm;
843 oop from_mirror = JNIHandles::resolve_non_null(from);
844 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
845 const char * from_name = from_class->external_name();
846
847 oop mirror = JNIHandles::resolve_non_null(result);
848 Klass* to_class = java_lang_Class::as_Klass(mirror);
849 const char * to = to_class->external_name();
850 log_debug(class, resolve)("%s %s (verification)", from_name, to);
851 }
852
853 return result;
854 JVM_END
855
856 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
857 static jclass jvm_define_class_common(const char *name,
858 jobject loader, const jbyte *buf,
859 jsize len, jobject pd, const char *source,
860 TRAPS) {
861 if (source == nullptr) source = "__JVM_DefineClass__";
862
863 JavaThread* jt = THREAD;
864
865 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
866 ClassLoader::perf_define_appclass_selftime(),
867 ClassLoader::perf_define_appclasses(),
868 jt->get_thread_stat()->perf_recursion_counts_addr(),
869 jt->get_thread_stat()->perf_timers_addr(),
870 PerfClassTraceTime::DEFINE_CLASS);
871
872 if (UsePerfData) {
873 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
874 }
875
876 // Class resolution will get the class name from the .class stream if the name is null.
877 TempNewSymbol class_name = name == nullptr ? nullptr :
878 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
879 CHECK_NULL);
880
881 ResourceMark rm(THREAD);
882 ClassFileStream st((u1*)buf, len, source);
883 Handle class_loader (THREAD, JNIHandles::resolve(loader));
884 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
885 ClassLoadInfo cl_info(protection_domain);
886 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
887 class_loader,
888 cl_info,
889 CHECK_NULL);
890
891 if (log_is_enabled(Debug, class, resolve)) {
892 trace_class_resolution(k);
893 }
894
895 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
896 }
897
898 enum {
899 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
900 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
901 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
902 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
903 };
904
905 /*
906 * Define a class with the specified flags that indicates if it's a nestmate,
907 * hidden, or strongly referenced from class loader.
908 */
909 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
910 const jbyte *buf, jsize len, jobject pd,
911 jboolean init, int flags, jobject classData, TRAPS) {
912 ResourceMark rm(THREAD);
913
914 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
915 // Lookup class must be a non-null instance
916 if (lookup_k == nullptr) {
917 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
918 }
919 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
920
921 Handle class_loader (THREAD, lookup_k->class_loader());
922
923 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
924 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
925 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
926 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
927
928 InstanceKlass* host_class = nullptr;
929 if (is_nestmate) {
930 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
931 }
932
933 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
934 name,
935 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
936 is_nestmate ? host_class->external_name() : "",
937 is_hidden ? "hidden" : "not hidden",
938 is_strong ? "strong" : "weak",
939 vm_annotations ? "with vm annotations" : "without vm annotation");
940
941 if (!is_hidden) {
942 // classData is only applicable for hidden classes
943 if (classData != nullptr) {
944 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
945 }
946 if (is_nestmate) {
947 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
948 }
949 if (!is_strong) {
950 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
951 }
952 if (vm_annotations) {
953 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
954 }
955 if (flags != STRONG_LOADER_LINK) {
956 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
957 err_msg("invalid flag 0x%x", flags));
958 }
959 }
960
961 // Class resolution will get the class name from the .class stream if the name is null.
962 TempNewSymbol class_name = name == nullptr ? nullptr :
963 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
964 CHECK_NULL);
965
966 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
967 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
968 ClassFileStream st((u1*)buf, len, source);
969
970 InstanceKlass* ik = nullptr;
971 if (!is_hidden) {
972 ClassLoadInfo cl_info(protection_domain);
973 ik = SystemDictionary::resolve_from_stream(&st, class_name,
974 class_loader,
975 cl_info,
976 CHECK_NULL);
977
978 if (log_is_enabled(Debug, class, resolve)) {
979 trace_class_resolution(ik);
980 }
981 } else { // hidden
982 Handle classData_h(THREAD, JNIHandles::resolve(classData));
983 ClassLoadInfo cl_info(protection_domain,
984 host_class,
985 classData_h,
986 is_hidden,
987 is_strong,
988 vm_annotations);
989 ik = SystemDictionary::resolve_from_stream(&st, class_name,
990 class_loader,
991 cl_info,
992 CHECK_NULL);
993
994 // The hidden class loader data has been artificially been kept alive to
995 // this point. The mirror and any instances of this class have to keep
996 // it alive afterwards.
997 ik->class_loader_data()->dec_keep_alive_ref_count();
998
999 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1000 ModuleEntry* module = ik->module();
1001 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1002 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1003 module_name,
1004 ik->external_name(),
1005 host_class->external_name(),
1006 ik->is_hidden() ? "is hidden" : "is not hidden");
1007 }
1008 }
1009
1010 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1011 // non-hidden class or nestmate class must be in the same package as the Lookup class
1012 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1013 }
1014
1015 if (init) {
1016 ik->initialize(CHECK_NULL);
1017 } else {
1018 ik->link_class(CHECK_NULL);
1019 }
1020
1021 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1022 }
1023
1024 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1025 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1026 JVM_END
1027
1028 /*
1029 * Define a class with the specified lookup class.
1030 * lookup: Lookup class
1031 * name: the name of the class
1032 * buf: class bytes
1033 * len: length of class bytes
1034 * pd: protection domain
1035 * init: initialize the class
1036 * flags: properties of the class
1037 * classData: private static pre-initialized field
1038 */
1039 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1040 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1041
1042 if (lookup == nullptr) {
1043 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1044 }
1045
1046 assert(buf != nullptr, "buf must not be null");
1047
1048 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1049 JVM_END
1050
1051 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1052
1053 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1054 JVM_END
1055
1056 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1057 ResourceMark rm(THREAD);
1058
1059 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1060 char* str = java_lang_String::as_utf8_string(h_name());
1061
1062 // Sanity check, don't expect null
1063 if (str == nullptr) return nullptr;
1064
1065 // Internalize the string, converting '.' to '/' in string.
1066 char* p = (char*)str;
1067 while (*p != '\0') {
1068 if (*p == '.') {
1069 *p = '/';
1070 }
1071 p++;
1072 }
1073
1074 const int str_len = (int)(p - str);
1075 if (str_len > Symbol::max_length()) {
1076 // It's impossible to create this class; the name cannot fit
1077 // into the constant pool.
1078 return nullptr;
1079 }
1080 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1081
1082 // Security Note:
1083 // The Java level wrapper will perform the necessary security check allowing
1084 // us to pass the null as the initiating class loader.
1085 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1086 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1087 #if INCLUDE_CDS
1088 if (k == nullptr) {
1089 // If the class is not already loaded, try to see if it's in the shared
1090 // archive for the current classloader (h_loader).
1091 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1092 }
1093 #endif
1094 return (k == nullptr) ? nullptr :
1095 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1096 JVM_END
1097
1098 // Module support //////////////////////////////////////////////////////////////////////////////
1099
1100 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1101 jstring location, jobjectArray packages))
1102 Handle h_module (THREAD, JNIHandles::resolve(module));
1103 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1104 JVM_END
1105
1106 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1107 Handle h_module (THREAD, JNIHandles::resolve(module));
1108 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1109 JVM_END
1110
1111 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1112 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1113 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1114 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1115 JVM_END
1116
1117 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1118 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1119 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1120 JVM_END
1121
1122 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1123 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1124 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1125 JVM_END
1126
1127 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1128 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1129 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1130 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1131 JVM_END
1132
1133 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1134 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1135 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1136 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1137 JVM_END
1138
1139 // Reflection support //////////////////////////////////////////////////////////////////////////////
1140
1141 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1142 assert (cls != nullptr, "illegal class");
1143 JvmtiVMObjectAllocEventCollector oam;
1144 ResourceMark rm(THREAD);
1145 HandleMark hm(THREAD);
1146 Handle java_class(THREAD, JNIHandles::resolve(cls));
1147 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1148 return (jstring) JNIHandles::make_local(THREAD, result);
1149 JVM_END
1150
1151
1152 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1153 JvmtiVMObjectAllocEventCollector oam;
1154 oop mirror = JNIHandles::resolve_non_null(cls);
1155
1156 // Special handling for primitive objects
1157 if (java_lang_Class::is_primitive(mirror)) {
1158 // Primitive objects does not have any interfaces
1159 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1160 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1161 }
1162
1163 Klass* klass = java_lang_Class::as_Klass(mirror);
1164 // Figure size of result array
1165 int size;
1166 if (klass->is_instance_klass()) {
1167 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1168 } else {
1169 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1170 size = 2;
1171 }
1172
1173 // Allocate result array
1174 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1175 objArrayHandle result (THREAD, r);
1176 // Fill in result
1177 if (klass->is_instance_klass()) {
1178 // Regular instance klass, fill in all local interfaces
1179 for (int index = 0; index < size; index++) {
1180 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1181 result->obj_at_put(index, k->java_mirror());
1182 }
1183 } else {
1184 // All arrays implement java.lang.Cloneable and java.io.Serializable
1185 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1186 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1187 }
1188 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1189 JVM_END
1190
1191
1192 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1193 oop mirror = JNIHandles::resolve_non_null(cls);
1194 if (java_lang_Class::is_primitive(mirror)) {
1195 return JNI_FALSE;
1196 }
1197 Klass* k = java_lang_Class::as_Klass(mirror);
1198 return k->is_hidden();
1199 JVM_END
1200
1201
1202 class ScopedValueBindingsResolver {
1203 public:
1204 InstanceKlass* Carrier_klass;
1205 ScopedValueBindingsResolver(JavaThread* THREAD) {
1206 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1207 Carrier_klass = InstanceKlass::cast(k);
1208 }
1209 };
1210
1211 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1212 ResourceMark rm(THREAD);
1213 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1214 JvmtiVMObjectAllocEventCollector oam;
1215
1216 static ScopedValueBindingsResolver resolver(THREAD);
1217
1218 // Iterate through Java frames
1219 vframeStream vfst(thread);
1220 for(; !vfst.at_end(); vfst.next()) {
1221 int loc = -1;
1222 // get method of frame
1223 Method* method = vfst.method();
1224
1225 Symbol *name = method->name();
1226
1227 InstanceKlass* holder = method->method_holder();
1228 if (name == vmSymbols::runWith_method_name()) {
1229 if (holder == vmClasses::Thread_klass()
1230 || holder == resolver.Carrier_klass) {
1231 loc = 1;
1232 }
1233 }
1234
1235 if (loc != -1) {
1236 javaVFrame *frame = vfst.asJavaVFrame();
1237 StackValueCollection* locals = frame->locals();
1238 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1239 Handle result = head_sv->get_obj();
1240 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1241 if (result() != nullptr) {
1242 return JNIHandles::make_local(THREAD, result());
1243 }
1244 }
1245 }
1246
1247 return nullptr;
1248 JVM_END
1249
1250 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1251 JvmtiVMObjectAllocEventCollector oam;
1252 // ofClass is a reference to a java_lang_Class object. The mirror object
1253 // of an InstanceKlass
1254 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1255 if (java_lang_Class::is_primitive(ofMirror) ||
1256 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1257 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1258 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1259 }
1260
1261 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1262 InnerClassesIterator iter(k);
1263
1264 if (iter.length() == 0) {
1265 // Neither an inner nor outer class
1266 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1267 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1268 }
1269
1270 // find inner class info
1271 constantPoolHandle cp(thread, k->constants());
1272 int length = iter.length();
1273
1274 // Allocate temp. result array
1275 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1276 objArrayHandle result (THREAD, r);
1277 int members = 0;
1278
1279 for (; !iter.done(); iter.next()) {
1280 int ioff = iter.inner_class_info_index();
1281 int ooff = iter.outer_class_info_index();
1282
1283 if (ioff != 0 && ooff != 0) {
1284 // Check to see if the name matches the class we're looking for
1285 // before attempting to find the class.
1286 if (cp->klass_name_at_matches(k, ooff)) {
1287 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1288 if (outer_klass == k) {
1289 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1290 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1291
1292 // Throws an exception if outer klass has not declared k as
1293 // an inner klass
1294 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1295
1296 result->obj_at_put(members, inner_klass->java_mirror());
1297 members++;
1298 }
1299 }
1300 }
1301 }
1302
1303 if (members != length) {
1304 // Return array of right length
1305 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1306 for(int i = 0; i < members; i++) {
1307 res->obj_at_put(i, result->obj_at(i));
1308 }
1309 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1310 }
1311
1312 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1313 JVM_END
1314
1315
1316 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1317 {
1318 // ofClass is a reference to a java_lang_Class object.
1319 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1320 if (java_lang_Class::is_primitive(ofMirror)) {
1321 return nullptr;
1322 }
1323 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1324 if (!klass->is_instance_klass()) {
1325 return nullptr;
1326 }
1327
1328 bool inner_is_member = false;
1329 Klass* outer_klass
1330 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1331 if (outer_klass == nullptr) return nullptr; // already a top-level class
1332 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1333 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1334 }
1335 JVM_END
1336
1337 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1338 {
1339 oop mirror = JNIHandles::resolve_non_null(cls);
1340 if (java_lang_Class::is_primitive(mirror)) {
1341 return nullptr;
1342 }
1343 Klass* klass = java_lang_Class::as_Klass(mirror);
1344 if (!klass->is_instance_klass()) {
1345 return nullptr;
1346 }
1347 InstanceKlass* k = InstanceKlass::cast(klass);
1348 int ooff = 0, noff = 0;
1349 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1350 if (noff != 0) {
1351 constantPoolHandle i_cp(thread, k->constants());
1352 Symbol* name = i_cp->symbol_at(noff);
1353 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1354 return (jstring) JNIHandles::make_local(THREAD, str());
1355 }
1356 }
1357 return nullptr;
1358 }
1359 JVM_END
1360
1361 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1362 assert (cls != nullptr, "illegal class");
1363 JvmtiVMObjectAllocEventCollector oam;
1364 ResourceMark rm(THREAD);
1365 oop mirror = JNIHandles::resolve_non_null(cls);
1366 // Return null for arrays and primitives
1367 if (!java_lang_Class::is_primitive(mirror)) {
1368 Klass* k = java_lang_Class::as_Klass(mirror);
1369 if (k->is_instance_klass()) {
1370 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1371 if (sym == nullptr) return nullptr;
1372 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1373 return (jstring) JNIHandles::make_local(THREAD, str());
1374 }
1375 }
1376 return nullptr;
1377 JVM_END
1378
1379
1380 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1381 assert (cls != nullptr, "illegal class");
1382 oop mirror = JNIHandles::resolve_non_null(cls);
1383 // Return null for arrays and primitives
1384 if (!java_lang_Class::is_primitive(mirror)) {
1385 Klass* k = java_lang_Class::as_Klass(mirror);
1386 if (k->is_instance_klass()) {
1387 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1388 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1389 }
1390 }
1391 return nullptr;
1392 JVM_END
1393
1394
1395 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1396 // some of this code was adapted from from jni_FromReflectedField
1397
1398 oop reflected = JNIHandles::resolve_non_null(field);
1399 oop mirror = java_lang_reflect_Field::clazz(reflected);
1400 Klass* k = java_lang_Class::as_Klass(mirror);
1401 int slot = java_lang_reflect_Field::slot(reflected);
1402 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1403
1404 InstanceKlass* ik = InstanceKlass::cast(k);
1405 int offset = ik->field_offset(slot);
1406
1407 if (modifiers & JVM_ACC_STATIC) {
1408 // for static fields we only look in the current class
1409 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1410 assert(false, "cannot find static field");
1411 return false;
1412 }
1413 } else {
1414 // for instance fields we start with the current class and work
1415 // our way up through the superclass chain
1416 if (!ik->find_field_from_offset(offset, false, &fd)) {
1417 assert(false, "cannot find instance field");
1418 return false;
1419 }
1420 }
1421 return true;
1422 }
1423
1424 static Method* jvm_get_method_common(jobject method) {
1425 // some of this code was adapted from from jni_FromReflectedMethod
1426
1427 oop reflected = JNIHandles::resolve_non_null(method);
1428 oop mirror = nullptr;
1429 int slot = 0;
1430
1431 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1432 mirror = java_lang_reflect_Constructor::clazz(reflected);
1433 slot = java_lang_reflect_Constructor::slot(reflected);
1434 } else {
1435 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1436 "wrong type");
1437 mirror = java_lang_reflect_Method::clazz(reflected);
1438 slot = java_lang_reflect_Method::slot(reflected);
1439 }
1440 Klass* k = java_lang_Class::as_Klass(mirror);
1441
1442 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1443 assert(m != nullptr, "cannot find method");
1444 return m; // caller has to deal with null in product mode
1445 }
1446
1447 /* Type use annotations support (JDK 1.8) */
1448
1449 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1450 assert (cls != nullptr, "illegal class");
1451 ResourceMark rm(THREAD);
1452 // Return null for arrays and primitives
1453 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1455 if (k->is_instance_klass()) {
1456 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1457 if (type_annotations != nullptr) {
1458 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1459 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1460 }
1461 }
1462 }
1463 return nullptr;
1464 JVM_END
1465
1466 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1467 assert (method != nullptr, "illegal method");
1468 // method is a handle to a java.lang.reflect.Method object
1469 Method* m = jvm_get_method_common(method);
1470 if (m == nullptr) {
1471 return nullptr;
1472 }
1473
1474 AnnotationArray* type_annotations = m->type_annotations();
1475 if (type_annotations != nullptr) {
1476 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1477 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1478 }
1479
1480 return nullptr;
1481 JVM_END
1482
1483 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1484 assert (field != nullptr, "illegal field");
1485 fieldDescriptor fd;
1486 bool gotFd = jvm_get_field_common(field, fd);
1487 if (!gotFd) {
1488 return nullptr;
1489 }
1490
1491 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1492 JVM_END
1493
1494 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1495 if (!cp->is_within_bounds(index)) {
1496 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1497 }
1498 }
1499
1500 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1501 {
1502 // method is a handle to a java.lang.reflect.Method object
1503 Method* method_ptr = jvm_get_method_common(method);
1504 methodHandle mh (THREAD, method_ptr);
1505 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1506 const int num_params = mh->method_parameters_length();
1507
1508 if (num_params < 0) {
1509 // A -1 return value from method_parameters_length means there is no
1510 // parameter data. Return null to indicate this to the reflection
1511 // API.
1512 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1513 return (jobjectArray)nullptr;
1514 } else {
1515 // Otherwise, we return something up to reflection, even if it is
1516 // a zero-length array. Why? Because in some cases this can
1517 // trigger a MalformedParametersException.
1518
1519 // make sure all the symbols are properly formatted
1520 for (int i = 0; i < num_params; i++) {
1521 MethodParametersElement* params = mh->method_parameters_start();
1522 int index = params[i].name_cp_index;
1523 constantPoolHandle cp(THREAD, mh->constants());
1524 bounds_check(cp, index, CHECK_NULL);
1525
1526 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1527 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1528 "Wrong type at constant pool index");
1529 }
1530
1531 }
1532
1533 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1534 objArrayHandle result (THREAD, result_oop);
1535
1536 for (int i = 0; i < num_params; i++) {
1537 MethodParametersElement* params = mh->method_parameters_start();
1538 // For a 0 index, give a null symbol
1539 Symbol* sym = 0 != params[i].name_cp_index ?
1540 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1541 int flags = params[i].flags;
1542 oop param = Reflection::new_parameter(reflected_method, i, sym,
1543 flags, CHECK_NULL);
1544 result->obj_at_put(i, param);
1545 }
1546 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1547 }
1548 }
1549 JVM_END
1550
1551 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1552
1553 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1554 {
1555 JvmtiVMObjectAllocEventCollector oam;
1556
1557 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1558 // Exclude primitive types and array types
1559 if (java_lang_Class::is_primitive(ofMirror) ||
1560 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1561 // Return empty array
1562 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1563 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1564 }
1565
1566 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1567 constantPoolHandle cp(THREAD, k->constants());
1568
1569 // Ensure class is linked
1570 k->link_class(CHECK_NULL);
1571
1572 // Allocate result
1573 int num_fields;
1574
1575 if (publicOnly) {
1576 num_fields = 0;
1577 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1578 if (fs.access_flags().is_public()) ++num_fields;
1579 }
1580 } else {
1581 num_fields = k->java_fields_count();
1582 }
1583
1584 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1585 objArrayHandle result (THREAD, r);
1586
1587 int out_idx = 0;
1588 fieldDescriptor fd;
1589 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1590 if (!publicOnly || fs.access_flags().is_public()) {
1591 fd.reinitialize(k, fs.to_FieldInfo());
1592 oop field = Reflection::new_field(&fd, CHECK_NULL);
1593 result->obj_at_put(out_idx, field);
1594 ++out_idx;
1595 }
1596 }
1597 assert(out_idx == num_fields, "just checking");
1598 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1599 }
1600 JVM_END
1601
1602 // A class is a record if and only if it is final and a direct subclass of
1603 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1604 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1605 {
1606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1607 if (k != nullptr && k->is_instance_klass()) {
1608 InstanceKlass* ik = InstanceKlass::cast(k);
1609 return ik->is_record();
1610 } else {
1611 return false;
1612 }
1613 }
1614 JVM_END
1615
1616 // Returns an array containing the components of the Record attribute,
1617 // or null if the attribute is not present.
1618 //
1619 // Note that this function returns the components of the Record attribute
1620 // even if the class is not a record.
1621 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1622 {
1623 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1624 assert(c->is_instance_klass(), "must be");
1625 InstanceKlass* ik = InstanceKlass::cast(c);
1626
1627 Array<RecordComponent*>* components = ik->record_components();
1628 if (components != nullptr) {
1629 JvmtiVMObjectAllocEventCollector oam;
1630 constantPoolHandle cp(THREAD, ik->constants());
1631 int length = components->length();
1632 assert(length >= 0, "unexpected record_components length");
1633 objArrayOop record_components =
1634 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1635 objArrayHandle components_h (THREAD, record_components);
1636
1637 for (int x = 0; x < length; x++) {
1638 RecordComponent* component = components->at(x);
1639 assert(component != nullptr, "unexpected null record component");
1640 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1641 components_h->obj_at_put(x, component_oop);
1642 }
1643 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1644 }
1645
1646 return nullptr;
1647 }
1648 JVM_END
1649
1650 static jobjectArray get_class_declared_methods_helper(
1651 JNIEnv *env,
1652 jclass ofClass, jboolean publicOnly,
1653 bool want_constructor,
1654 Klass* klass, TRAPS) {
1655
1656 JvmtiVMObjectAllocEventCollector oam;
1657
1658 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1659 // Exclude primitive types and array types
1660 if (java_lang_Class::is_primitive(ofMirror)
1661 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1662 // Return empty array
1663 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1664 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1665 }
1666
1667 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1668
1669 // Ensure class is linked
1670 k->link_class(CHECK_NULL);
1671
1672 Array<Method*>* methods = k->methods();
1673 int methods_length = methods->length();
1674
1675 // Save original method_idnum in case of redefinition, which can change
1676 // the idnum of obsolete methods. The new method will have the same idnum
1677 // but if we refresh the methods array, the counts will be wrong.
1678 ResourceMark rm(THREAD);
1679 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1680 int num_methods = 0;
1681
1682 // Select methods matching the criteria.
1683 for (int i = 0; i < methods_length; i++) {
1684 Method* method = methods->at(i);
1685 if (want_constructor && !method->is_object_initializer()) {
1686 continue;
1687 }
1688 if (!want_constructor &&
1689 (method->is_object_initializer() || method->is_static_initializer() ||
1690 method->is_overpass())) {
1691 continue;
1692 }
1693 if (publicOnly && !method->is_public()) {
1694 continue;
1695 }
1696 idnums->push(method->method_idnum());
1697 ++num_methods;
1698 }
1699
1700 // Allocate result
1701 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1702 objArrayHandle result (THREAD, r);
1703
1704 // Now just put the methods that we selected above, but go by their idnum
1705 // in case of redefinition. The methods can be redefined at any safepoint,
1706 // so above when allocating the oop array and below when creating reflect
1707 // objects.
1708 for (int i = 0; i < num_methods; i++) {
1709 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1710 if (method.is_null()) {
1711 // Method may have been deleted and seems this API can handle null
1712 // Otherwise should probably put a method that throws NSME
1713 result->obj_at_put(i, nullptr);
1714 } else {
1715 oop m;
1716 if (want_constructor) {
1717 m = Reflection::new_constructor(method, CHECK_NULL);
1718 } else {
1719 m = Reflection::new_method(method, false, CHECK_NULL);
1720 }
1721 result->obj_at_put(i, m);
1722 }
1723 }
1724
1725 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1726 }
1727
1728 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1729 {
1730 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1731 /*want_constructor*/ false,
1732 vmClasses::reflect_Method_klass(), THREAD);
1733 }
1734 JVM_END
1735
1736 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1737 {
1738 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1739 /*want_constructor*/ true,
1740 vmClasses::reflect_Constructor_klass(), THREAD);
1741 }
1742 JVM_END
1743
1744 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1745 {
1746 oop mirror = JNIHandles::resolve_non_null(cls);
1747 if (java_lang_Class::is_primitive(mirror)) {
1748 // Primitive type
1749 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1750 }
1751
1752 Klass* k = java_lang_Class::as_Klass(mirror);
1753 return k->access_flags().as_class_flags();
1754 }
1755 JVM_END
1756
1757 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1758 {
1759 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1760 assert(c->is_instance_klass(), "must be");
1761 InstanceKlass* ck = InstanceKlass::cast(c);
1762 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1763 assert(m->is_instance_klass(), "must be");
1764 InstanceKlass* mk = InstanceKlass::cast(m);
1765 return ck->has_nestmate_access_to(mk, THREAD);
1766 }
1767 JVM_END
1768
1769 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1770 {
1771 // current is not a primitive or array class
1772 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1773 assert(c->is_instance_klass(), "must be");
1774 InstanceKlass* ck = InstanceKlass::cast(c);
1775 InstanceKlass* host = ck->nest_host(THREAD);
1776 return (jclass) (host == nullptr ? nullptr :
1777 JNIHandles::make_local(THREAD, host->java_mirror()));
1778 }
1779 JVM_END
1780
1781 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1782 {
1783 // current is not a primitive or array class
1784 ResourceMark rm(THREAD);
1785 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1786 assert(c->is_instance_klass(), "must be");
1787 InstanceKlass* ck = InstanceKlass::cast(c);
1788 InstanceKlass* host = ck->nest_host(THREAD);
1789
1790 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1791 ck->external_name(), host->external_name());
1792 {
1793 JvmtiVMObjectAllocEventCollector oam;
1794 Array<u2>* members = host->nest_members();
1795 int length = members == nullptr ? 0 : members->length();
1796
1797 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1798
1799 // nest host is first in the array so make it one bigger
1800 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1801 length + 1, CHECK_NULL);
1802 objArrayHandle result(THREAD, r);
1803 result->obj_at_put(0, host->java_mirror());
1804 if (length != 0) {
1805 int count = 0;
1806 for (int i = 0; i < length; i++) {
1807 int cp_index = members->at(i);
1808 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1809 if (HAS_PENDING_EXCEPTION) {
1810 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1811 return nullptr; // propagate VMEs
1812 }
1813 if (log_is_enabled(Trace, class, nestmates)) {
1814 stringStream ss;
1815 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1816 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1817 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1818 log_trace(class, nestmates)("%s", ss.as_string());
1819 }
1820 CLEAR_PENDING_EXCEPTION;
1821 continue;
1822 }
1823 if (k->is_instance_klass()) {
1824 InstanceKlass* ik = InstanceKlass::cast(k);
1825 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1826 if (nest_host_k == host) {
1827 result->obj_at_put(count+1, k->java_mirror());
1828 count++;
1829 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1830 } else {
1831 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1832 ik->external_name(), nest_host_k->external_name());
1833 }
1834 } else {
1835 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1836 k->external_name());
1837 }
1838 }
1839 if (count < length) {
1840 // we had invalid entries so we need to compact the array
1841 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1842 length + 1, count + 1);
1843
1844 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1845 count + 1, CHECK_NULL);
1846 objArrayHandle result2(THREAD, r2);
1847 for (int i = 0; i < count + 1; i++) {
1848 result2->obj_at_put(i, result->obj_at(i));
1849 }
1850 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1851 }
1852 }
1853 else {
1854 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
1855 }
1856 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1857 }
1858 }
1859 JVM_END
1860
1861 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1862 {
1863 oop mirror = JNIHandles::resolve_non_null(current);
1864 assert(!java_lang_Class::is_primitive(mirror), "should not be");
1865 Klass* c = java_lang_Class::as_Klass(mirror);
1866 assert(c->is_instance_klass(), "must be");
1867 InstanceKlass* ik = InstanceKlass::cast(c);
1868 ResourceMark rm(THREAD);
1869 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
1870 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
1871 if (ik->is_sealed()) {
1872 JvmtiVMObjectAllocEventCollector oam;
1873 Array<u2>* subclasses = ik->permitted_subclasses();
1874 int length = subclasses->length();
1875
1876 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
1877
1878 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1879 length, CHECK_NULL);
1880 objArrayHandle result(THREAD, r);
1881 int count = 0;
1882 for (int i = 0; i < length; i++) {
1883 int cp_index = subclasses->at(i);
1884 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
1885 if (HAS_PENDING_EXCEPTION) {
1886 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1887 return nullptr; // propagate VMEs
1888 }
1889 if (log_is_enabled(Trace, class, sealed)) {
1890 stringStream ss;
1891 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
1892 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
1893 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1894 log_trace(class, sealed)("%s", ss.as_string());
1895 }
1896
1897 CLEAR_PENDING_EXCEPTION;
1898 continue;
1899 }
1900 if (k->is_instance_klass()) {
1901 result->obj_at_put(count++, k->java_mirror());
1902 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
1903 }
1904 }
1905 if (count < length) {
1906 // we had invalid entries so we need to compact the array
1907 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1908 count, CHECK_NULL);
1909 objArrayHandle result2(THREAD, r2);
1910 for (int i = 0; i < count; i++) {
1911 result2->obj_at_put(i, result->obj_at(i));
1912 }
1913 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1914 }
1915 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1916 } else {
1917 return nullptr;
1918 }
1919 }
1920 JVM_END
1921
1922 // Constant pool access //////////////////////////////////////////////////////////
1923
1924 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1925 {
1926 JvmtiVMObjectAllocEventCollector oam;
1927 oop mirror = JNIHandles::resolve_non_null(cls);
1928 // Return null for primitives and arrays
1929 if (!java_lang_Class::is_primitive(mirror)) {
1930 Klass* k = java_lang_Class::as_Klass(mirror);
1931 if (k->is_instance_klass()) {
1932 InstanceKlass* k_h = InstanceKlass::cast(k);
1933 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1934 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1935 return JNIHandles::make_local(THREAD, jcp());
1936 }
1937 }
1938 return nullptr;
1939 }
1940 JVM_END
1941
1942
1943 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1944 {
1945 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1946 return cp->length();
1947 }
1948 JVM_END
1949
1950
1951 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1952 {
1953 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1954 bounds_check(cp, index, CHECK_NULL);
1955 constantTag tag = cp->tag_at(index);
1956 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1957 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1958 }
1959 Klass* k = cp->klass_at(index, CHECK_NULL);
1960 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1961 }
1962 JVM_END
1963
1964 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1965 {
1966 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1967 bounds_check(cp, index, CHECK_NULL);
1968 constantTag tag = cp->tag_at(index);
1969 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1970 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1971 }
1972 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1973 if (k == nullptr) return nullptr;
1974 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1975 }
1976 JVM_END
1977
1978 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1979 constantTag tag = cp->tag_at(index);
1980 if (!tag.is_method() && !tag.is_interface_method()) {
1981 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1982 }
1983 int klass_ref = cp->uncached_klass_ref_index_at(index);
1984 Klass* k_o;
1985 if (force_resolution) {
1986 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1987 } else {
1988 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1989 if (k_o == nullptr) return nullptr;
1990 }
1991 InstanceKlass* k = InstanceKlass::cast(k_o);
1992 Symbol* name = cp->uncached_name_ref_at(index);
1993 Symbol* sig = cp->uncached_signature_ref_at(index);
1994 methodHandle m (THREAD, k->find_method(name, sig));
1995 if (m.is_null()) {
1996 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1997 }
1998 oop method;
1999 if (m->is_object_initializer()) {
2000 method = Reflection::new_constructor(m, CHECK_NULL);
2001 } else {
2002 // new_method accepts <clinit> as Method here
2003 method = Reflection::new_method(m, true, CHECK_NULL);
2004 }
2005 return JNIHandles::make_local(THREAD, method);
2006 }
2007
2008 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2009 {
2010 JvmtiVMObjectAllocEventCollector oam;
2011 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2012 bounds_check(cp, index, CHECK_NULL);
2013 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2014 return res;
2015 }
2016 JVM_END
2017
2018 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2019 {
2020 JvmtiVMObjectAllocEventCollector oam;
2021 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2022 bounds_check(cp, index, CHECK_NULL);
2023 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2024 return res;
2025 }
2026 JVM_END
2027
2028 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2029 constantTag tag = cp->tag_at(index);
2030 if (!tag.is_field()) {
2031 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2032 }
2033 int klass_ref = cp->uncached_klass_ref_index_at(index);
2034 Klass* k_o;
2035 if (force_resolution) {
2036 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2037 } else {
2038 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2039 if (k_o == nullptr) return nullptr;
2040 }
2041 InstanceKlass* k = InstanceKlass::cast(k_o);
2042 Symbol* name = cp->uncached_name_ref_at(index);
2043 Symbol* sig = cp->uncached_signature_ref_at(index);
2044 fieldDescriptor fd;
2045 Klass* target_klass = k->find_field(name, sig, &fd);
2046 if (target_klass == nullptr) {
2047 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2048 }
2049 oop field = Reflection::new_field(&fd, CHECK_NULL);
2050 return JNIHandles::make_local(THREAD, field);
2051 }
2052
2053 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2054 {
2055 JvmtiVMObjectAllocEventCollector oam;
2056 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2057 bounds_check(cp, index, CHECK_NULL);
2058 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2059 return res;
2060 }
2061 JVM_END
2062
2063 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2064 {
2065 JvmtiVMObjectAllocEventCollector oam;
2066 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2067 bounds_check(cp, index, CHECK_NULL);
2068 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2069 return res;
2070 }
2071 JVM_END
2072
2073 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2074 {
2075 JvmtiVMObjectAllocEventCollector oam;
2076 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2077 bounds_check(cp, index, CHECK_NULL);
2078 constantTag tag = cp->tag_at(index);
2079 if (!tag.is_field_or_method()) {
2080 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2081 }
2082 int klass_ref = cp->uncached_klass_ref_index_at(index);
2083 Symbol* klass_name = cp->klass_name_at(klass_ref);
2084 Symbol* member_name = cp->uncached_name_ref_at(index);
2085 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2086 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2087 objArrayHandle dest(THREAD, dest_o);
2088 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2089 dest->obj_at_put(0, str());
2090 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2091 dest->obj_at_put(1, str());
2092 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2093 dest->obj_at_put(2, str());
2094 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2095 }
2096 JVM_END
2097
2098 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2099 {
2100 JvmtiVMObjectAllocEventCollector oam;
2101 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2102 bounds_check(cp, index, CHECK_0);
2103 constantTag tag = cp->tag_at(index);
2104 if (!tag.is_field_or_method()) {
2105 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2106 }
2107 return (jint) cp->uncached_klass_ref_index_at(index);
2108 }
2109 JVM_END
2110
2111 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2112 {
2113 JvmtiVMObjectAllocEventCollector oam;
2114 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2115 bounds_check(cp, index, CHECK_0);
2116 constantTag tag = cp->tag_at(index);
2117 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2118 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2119 }
2120 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2121 }
2122 JVM_END
2123
2124 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2125 {
2126 JvmtiVMObjectAllocEventCollector oam;
2127 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2128 bounds_check(cp, index, CHECK_NULL);
2129 constantTag tag = cp->tag_at(index);
2130 if (!tag.is_name_and_type()) {
2131 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2132 }
2133 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2134 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2135 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2136 objArrayHandle dest(THREAD, dest_o);
2137 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2138 dest->obj_at_put(0, str());
2139 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2140 dest->obj_at_put(1, str());
2141 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2142 }
2143 JVM_END
2144
2145 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2146 {
2147 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2148 bounds_check(cp, index, CHECK_0);
2149 constantTag tag = cp->tag_at(index);
2150 if (!tag.is_int()) {
2151 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2152 }
2153 return cp->int_at(index);
2154 }
2155 JVM_END
2156
2157 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2158 {
2159 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2160 bounds_check(cp, index, CHECK_(0L));
2161 constantTag tag = cp->tag_at(index);
2162 if (!tag.is_long()) {
2163 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2164 }
2165 return cp->long_at(index);
2166 }
2167 JVM_END
2168
2169 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2170 {
2171 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2172 bounds_check(cp, index, CHECK_(0.0f));
2173 constantTag tag = cp->tag_at(index);
2174 if (!tag.is_float()) {
2175 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2176 }
2177 return cp->float_at(index);
2178 }
2179 JVM_END
2180
2181 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2182 {
2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2184 bounds_check(cp, index, CHECK_(0.0));
2185 constantTag tag = cp->tag_at(index);
2186 if (!tag.is_double()) {
2187 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2188 }
2189 return cp->double_at(index);
2190 }
2191 JVM_END
2192
2193 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2194 {
2195 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2196 bounds_check(cp, index, CHECK_NULL);
2197 constantTag tag = cp->tag_at(index);
2198 if (!tag.is_string()) {
2199 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2200 }
2201 oop str = cp->string_at(index, CHECK_NULL);
2202 return (jstring) JNIHandles::make_local(THREAD, str);
2203 }
2204 JVM_END
2205
2206 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2207 {
2208 JvmtiVMObjectAllocEventCollector oam;
2209 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2210 bounds_check(cp, index, CHECK_NULL);
2211 constantTag tag = cp->tag_at(index);
2212 if (!tag.is_symbol()) {
2213 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2214 }
2215 Symbol* sym = cp->symbol_at(index);
2216 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2217 return (jstring) JNIHandles::make_local(THREAD, str());
2218 }
2219 JVM_END
2220
2221 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2222 {
2223 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2224 bounds_check(cp, index, CHECK_0);
2225 constantTag tag = cp->tag_at(index);
2226 jbyte result = tag.value();
2227 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2228 // they are changed to the corresponding tags from the JVM spec, so that java code in
2229 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2230 if (tag.is_klass_or_reference()) {
2231 result = JVM_CONSTANT_Class;
2232 } else if (tag.is_string_index()) {
2233 result = JVM_CONSTANT_String;
2234 } else if (tag.is_method_type_in_error()) {
2235 result = JVM_CONSTANT_MethodType;
2236 } else if (tag.is_method_handle_in_error()) {
2237 result = JVM_CONSTANT_MethodHandle;
2238 } else if (tag.is_dynamic_constant_in_error()) {
2239 result = JVM_CONSTANT_Dynamic;
2240 }
2241 return result;
2242 }
2243 JVM_END
2244
2245 // Assertion support. //////////////////////////////////////////////////////////
2246
2247 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2248 assert(cls != nullptr, "bad class");
2249
2250 oop r = JNIHandles::resolve(cls);
2251 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2252 if (java_lang_Class::is_primitive(r)) return false;
2253
2254 Klass* k = java_lang_Class::as_Klass(r);
2255 assert(k->is_instance_klass(), "must be an instance klass");
2256 if (!k->is_instance_klass()) return false;
2257
2258 ResourceMark rm(THREAD);
2259 const char* name = k->name()->as_C_string();
2260 bool system_class = k->class_loader() == nullptr;
2261 return JavaAssertions::enabled(name, system_class);
2262
2263 JVM_END
2264
2265
2266 // Return a new AssertionStatusDirectives object with the fields filled in with
2267 // command-line assertion arguments (i.e., -ea, -da).
2268 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2269 JvmtiVMObjectAllocEventCollector oam;
2270 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2271 return JNIHandles::make_local(THREAD, asd);
2272 JVM_END
2273
2274 // Verification ////////////////////////////////////////////////////////////////////////////////
2275
2276 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2277
2278 // RedefineClasses support: bug 6214132 caused verification to fail.
2279 // All functions from this section should call the jvmtiThreadSate function:
2280 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2281 // The function returns a Klass* of the _scratch_class if the verifier
2282 // was invoked in the middle of the class redefinition.
2283 // Otherwise it returns its argument value which is the _the_class Klass*.
2284 // Please, refer to the description in the jvmtiThreadState.hpp.
2285
2286 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2287 oop mirror = JNIHandles::resolve_non_null(cls);
2288 if (java_lang_Class::is_primitive(mirror)) {
2289 return JNI_FALSE;
2290 }
2291 Klass* k = java_lang_Class::as_Klass(mirror);
2292 // This isn't necessary since answer is the same since redefinition
2293 // has already checked this matches for the scratch class.
2294 // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2295 jboolean result = k->is_interface();
2296 assert(!result || k->is_instance_klass(),
2297 "all interfaces are instance types");
2298 return result;
2299 JVM_END
2300
2301
2302 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2303 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2304 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2305 return k->name()->as_utf8();
2306 JVM_END
2307
2308
2309 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2310 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2311 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2312 // types will have length zero if this is not an InstanceKlass
2313 // (length is determined by call to JVM_GetClassCPEntriesCount)
2314 if (k->is_instance_klass()) {
2315 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2316 for (int index = cp->length() - 1; index >= 0; index--) {
2317 constantTag tag = cp->tag_at(index);
2318 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2319 }
2320 }
2321 JVM_END
2322
2323
2324 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2325 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2326 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2327 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2328 JVM_END
2329
2330
2331 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2332 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2333 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2334 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2335 JVM_END
2336
2337
2338 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2339 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2340 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2341 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2342 JVM_END
2343
2344
2345 // The following methods, used for the verifier, are never called with
2346 // array klasses, so a direct cast to InstanceKlass is safe.
2347 // Typically, these methods are called in a loop with bounds determined
2348 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2349 // zero for arrays.
2350 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2351 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2352 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2353 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2354 int length = method->checked_exceptions_length();
2355 if (length > 0) {
2356 CheckedExceptionElement* table= method->checked_exceptions_start();
2357 for (int i = 0; i < length; i++) {
2358 exceptions[i] = table[i].class_cp_index;
2359 }
2360 }
2361 JVM_END
2362
2363
2364 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2365 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2366 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2367 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2368 return method->checked_exceptions_length();
2369 JVM_END
2370
2371
2372 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2373 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2374 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2375 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2376 memcpy(code, method->code_base(), method->code_size());
2377 JVM_END
2378
2379
2380 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2381 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2382 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2383 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2384 return method->code_size();
2385 JVM_END
2386
2387
2388 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2389 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2390 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2391 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2392 ExceptionTable extable(method);
2393 entry->start_pc = extable.start_pc(entry_index);
2394 entry->end_pc = extable.end_pc(entry_index);
2395 entry->handler_pc = extable.handler_pc(entry_index);
2396 entry->catchType = extable.catch_type_index(entry_index);
2397 JVM_END
2398
2399
2400 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2401 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2402 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2403 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2404 return method->exception_table_length();
2405 JVM_END
2406
2407
2408 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2411 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2412 return method->access_flags().as_method_flags();
2413 JVM_END
2414
2415
2416 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2419 return InstanceKlass::cast(k)->field_access_flags(field_index);
2420 JVM_END
2421
2422
2423 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
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 return method->max_locals();
2428 JVM_END
2429
2430
2431 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int 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->size_of_parameters();
2436 JVM_END
2437
2438
2439 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
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 return method->verifier_max_stack();
2444 JVM_END
2445
2446
2447 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2448 ResourceMark rm(THREAD);
2449 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2450 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2451 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2452 return method->name() == vmSymbols::object_initializer_name();
2453 JVM_END
2454
2455
2456 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2457 ResourceMark rm(THREAD);
2458 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2459 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2460 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2461 return method->is_overpass();
2462 JVM_END
2463
2464 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2465 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2466 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2467 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2468 return method->name()->as_utf8();
2469 JVM_END
2470
2471
2472 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2474 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2475 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2476 return method->signature()->as_utf8();
2477 JVM_END
2478
2479 /**
2480 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2481 * read entries in the constant pool. Since the old verifier always
2482 * works on a copy of the code, it will not see any rewriting that
2483 * may possibly occur in the middle of verification. So it is important
2484 * that nothing it calls tries to use the cpCache instead of the raw
2485 * constant pool, so we must use cp->uncached_x methods when appropriate.
2486 */
2487 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2489 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2490 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2491 switch (cp->tag_at(cp_index).value()) {
2492 case JVM_CONSTANT_Fieldref:
2493 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2494 default:
2495 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2496 }
2497 ShouldNotReachHere();
2498 return nullptr;
2499 JVM_END
2500
2501
2502 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2504 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2505 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2506 switch (cp->tag_at(cp_index).value()) {
2507 case JVM_CONSTANT_InterfaceMethodref:
2508 case JVM_CONSTANT_Methodref:
2509 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2510 default:
2511 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2512 }
2513 ShouldNotReachHere();
2514 return nullptr;
2515 JVM_END
2516
2517
2518 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2519 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2520 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2521 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2522 switch (cp->tag_at(cp_index).value()) {
2523 case JVM_CONSTANT_InterfaceMethodref:
2524 case JVM_CONSTANT_Methodref:
2525 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2526 default:
2527 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2528 }
2529 ShouldNotReachHere();
2530 return nullptr;
2531 JVM_END
2532
2533
2534 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2535 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2536 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2537 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2538 switch (cp->tag_at(cp_index).value()) {
2539 case JVM_CONSTANT_Fieldref:
2540 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2541 default:
2542 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2543 }
2544 ShouldNotReachHere();
2545 return nullptr;
2546 JVM_END
2547
2548
2549 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2550 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2551 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2552 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2553 Symbol* classname = cp->klass_name_at(cp_index);
2554 return classname->as_utf8();
2555 JVM_END
2556
2557
2558 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2562 switch (cp->tag_at(cp_index).value()) {
2563 case JVM_CONSTANT_Fieldref: {
2564 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2565 Symbol* classname = cp->klass_name_at(class_index);
2566 return classname->as_utf8();
2567 }
2568 default:
2569 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2570 }
2571 ShouldNotReachHere();
2572 return nullptr;
2573 JVM_END
2574
2575
2576 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2579 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2580 switch (cp->tag_at(cp_index).value()) {
2581 case JVM_CONSTANT_Methodref:
2582 case JVM_CONSTANT_InterfaceMethodref: {
2583 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2584 Symbol* classname = cp->klass_name_at(class_index);
2585 return classname->as_utf8();
2586 }
2587 default:
2588 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2589 }
2590 ShouldNotReachHere();
2591 return nullptr;
2592 JVM_END
2593
2594
2595 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2596 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2597 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2600 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2601 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2602 switch (cp->tag_at(cp_index).value()) {
2603 case JVM_CONSTANT_Fieldref: {
2604 Symbol* name = cp->uncached_name_ref_at(cp_index);
2605 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2606 InstanceKlass* ik = InstanceKlass::cast(k_called);
2607 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2608 if (fs.name() == name && fs.signature() == signature) {
2609 return fs.access_flags().as_field_flags();
2610 }
2611 }
2612 return -1;
2613 }
2614 default:
2615 fatal("JVM_GetCPFieldModifiers: illegal constant");
2616 }
2617 ShouldNotReachHere();
2618 return 0;
2619 JVM_END
2620
2621
2622 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2623 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2624 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2625 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2626 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2627 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2628 switch (cp->tag_at(cp_index).value()) {
2629 case JVM_CONSTANT_Methodref:
2630 case JVM_CONSTANT_InterfaceMethodref: {
2631 Symbol* name = cp->uncached_name_ref_at(cp_index);
2632 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2633 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2634 int methods_count = methods->length();
2635 for (int i = 0; i < methods_count; i++) {
2636 Method* method = methods->at(i);
2637 if (method->name() == name && method->signature() == signature) {
2638 return method->access_flags().as_method_flags();
2639 }
2640 }
2641 return -1;
2642 }
2643 default:
2644 fatal("JVM_GetCPMethodModifiers: illegal constant");
2645 }
2646 ShouldNotReachHere();
2647 return 0;
2648 JVM_END
2649
2650
2651 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2652
2653 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2654 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2655 JVM_END
2656
2657
2658 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2659 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2660 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2661 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2662 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2663 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2664 JVM_END
2665
2666 // Printing support //////////////////////////////////////////////////
2667 extern "C" {
2668
2669 ATTRIBUTE_PRINTF(3, 0)
2670 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2671 // Reject count values that are negative signed values converted to
2672 // unsigned; see bug 4399518, 4417214
2673 if ((intptr_t)count <= 0) return -1;
2674
2675 int result = os::vsnprintf(str, count, fmt, args);
2676 if (result > 0 && (size_t)result >= count) {
2677 result = -1;
2678 }
2679
2680 return result;
2681 }
2682
2683 ATTRIBUTE_PRINTF(3, 4)
2684 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2685 va_list args;
2686 int len;
2687 va_start(args, fmt);
2688 len = jio_vsnprintf(str, count, fmt, args);
2689 va_end(args);
2690 return len;
2691 }
2692
2693 ATTRIBUTE_PRINTF(2, 3)
2694 int jio_fprintf(FILE* f, const char *fmt, ...) {
2695 int len;
2696 va_list args;
2697 va_start(args, fmt);
2698 len = jio_vfprintf(f, fmt, args);
2699 va_end(args);
2700 return len;
2701 }
2702
2703 ATTRIBUTE_PRINTF(2, 0)
2704 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2705 if (Arguments::vfprintf_hook() != nullptr) {
2706 return Arguments::vfprintf_hook()(f, fmt, args);
2707 } else {
2708 return vfprintf(f, fmt, args);
2709 }
2710 }
2711
2712 ATTRIBUTE_PRINTF(1, 2)
2713 JNIEXPORT int jio_printf(const char *fmt, ...) {
2714 int len;
2715 va_list args;
2716 va_start(args, fmt);
2717 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2718 va_end(args);
2719 return len;
2720 }
2721
2722 // HotSpot specific jio method
2723 void jio_print(const char* s, size_t len) {
2724 // Try to make this function as atomic as possible.
2725 if (Arguments::vfprintf_hook() != nullptr) {
2726 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2727 } else {
2728 // Make an unused local variable to avoid warning from gcc compiler.
2729 bool dummy = os::write(defaultStream::output_fd(), s, len);
2730 }
2731 }
2732
2733 } // Extern C
2734
2735 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2736
2737 // In most of the JVM thread support functions we need to access the
2738 // thread through a ThreadsListHandle to prevent it from exiting and
2739 // being reclaimed while we try to operate on it. The exceptions to this
2740 // rule are when operating on the current thread, or if the monitor of
2741 // the target java.lang.Thread is locked at the Java level - in both
2742 // cases the target cannot exit.
2743
2744 static void thread_entry(JavaThread* thread, TRAPS) {
2745 HandleMark hm(THREAD);
2746 Handle obj(THREAD, thread->threadObj());
2747 JavaValue result(T_VOID);
2748 JavaCalls::call_virtual(&result,
2749 obj,
2750 vmClasses::Thread_klass(),
2751 vmSymbols::run_method_name(),
2752 vmSymbols::void_method_signature(),
2753 THREAD);
2754 }
2755
2756
2757 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2758 #if INCLUDE_CDS
2759 if (CDSConfig::allow_only_single_java_thread()) {
2760 // During java -Xshare:dump, if we allow multiple Java threads to
2761 // execute in parallel, symbols and classes may be loaded in
2762 // random orders which will make the resulting CDS archive
2763 // non-deterministic.
2764 //
2765 // Lucikly, during java -Xshare:dump, it's important to run only
2766 // the code in the main Java thread (which is NOT started here) that
2767 // creates the module graph, etc. It's safe to not start the other
2768 // threads which are launched by class static initializers
2769 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2770 if (log_is_enabled(Info, cds)) {
2771 ResourceMark rm;
2772 oop t = JNIHandles::resolve_non_null(jthread);
2773 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2774 }
2775 return;
2776 }
2777 #endif
2778 JavaThread *native_thread = nullptr;
2779
2780 // We cannot hold the Threads_lock when we throw an exception,
2781 // due to rank ordering issues. Example: we might need to grab the
2782 // Heap_lock while we construct the exception.
2783 bool throw_illegal_thread_state = false;
2784
2785 // We must release the Threads_lock before we can post a jvmti event
2786 // in Thread::start.
2787 {
2788 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2789 // Ensure that the C++ Thread and OSThread structures aren't freed before
2790 // we operate.
2791 MutexLocker ml(Threads_lock);
2792
2793 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2794 // re-starting an already started thread, so we should usually find
2795 // that the JavaThread is null. However for a JNI attached thread
2796 // there is a small window between the Thread object being created
2797 // (with its JavaThread set) and the update to its threadStatus, so we
2798 // have to check for this
2799 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2800 throw_illegal_thread_state = true;
2801 } else {
2802 jlong size =
2803 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2804 // Allocate the C++ Thread structure and create the native thread. The
2805 // stack size retrieved from java is 64-bit signed, but the constructor takes
2806 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2807 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2808 // - Avoid passing negative values which would result in really large stacks.
2809 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2810 size_t sz = size > 0 ? (size_t) size : 0;
2811 native_thread = new JavaThread(&thread_entry, sz);
2812
2813 // At this point it may be possible that no osthread was created for the
2814 // JavaThread due to lack of memory. Check for this situation and throw
2815 // an exception if necessary. Eventually we may want to change this so
2816 // that we only grab the lock if the thread was created successfully -
2817 // then we can also do this check and throw the exception in the
2818 // JavaThread constructor.
2819 if (native_thread->osthread() != nullptr) {
2820 // Note: the current thread is not being used within "prepare".
2821 native_thread->prepare(jthread);
2822 }
2823 }
2824 }
2825
2826 if (throw_illegal_thread_state) {
2827 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2828 }
2829
2830 assert(native_thread != nullptr, "Starting null thread?");
2831
2832 if (native_thread->osthread() == nullptr) {
2833 ResourceMark rm(thread);
2834 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2835 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2836 // No one should hold a reference to the 'native_thread'.
2837 native_thread->smr_delete();
2838 if (JvmtiExport::should_post_resource_exhausted()) {
2839 JvmtiExport::post_resource_exhausted(
2840 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2841 os::native_thread_creation_failed_msg());
2842 }
2843 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2844 os::native_thread_creation_failed_msg());
2845 }
2846
2847 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2848
2849 Thread::start(native_thread);
2850
2851 JVM_END
2852
2853
2854 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2855 ThreadsListHandle tlh(thread);
2856 oop java_thread = nullptr;
2857 JavaThread* receiver = nullptr;
2858 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2859 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2860
2861 if (is_alive) {
2862 // jthread refers to a live JavaThread.
2863 Thread::set_priority(receiver, (ThreadPriority)prio);
2864 }
2865 // Implied else: If the JavaThread hasn't started yet, then the
2866 // priority set in the java.lang.Thread object above will be pushed
2867 // down when it does start.
2868 JVM_END
2869
2870
2871 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2872 HOTSPOT_THREAD_YIELD();
2873 os::naked_yield();
2874 JVM_END
2875
2876 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2877 if (nanos < 0) {
2878 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2879 }
2880
2881 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2882 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2883 }
2884
2885 // Save current thread state and restore it at the end of this block.
2886 // And set new thread state to SLEEPING.
2887 JavaThreadSleepState jtss(thread);
2888
2889 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
2890
2891 if (nanos == 0) {
2892 os::naked_yield();
2893 } else {
2894 ThreadState old_state = thread->osthread()->get_state();
2895 thread->osthread()->set_state(SLEEPING);
2896 if (!thread->sleep_nanos(nanos)) { // interrupted
2897 // An asynchronous exception could have been thrown on
2898 // us while we were sleeping. We do not overwrite those.
2899 if (!HAS_PENDING_EXCEPTION) {
2900 HOTSPOT_THREAD_SLEEP_END(1);
2901
2902 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2903 // to properly restore the thread state. That's likely wrong.
2904 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2905 }
2906 }
2907 thread->osthread()->set_state(old_state);
2908 }
2909 HOTSPOT_THREAD_SLEEP_END(0);
2910 JVM_END
2911
2912 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
2913 oop jthread = thread->threadObj();
2914 assert(jthread != nullptr, "no current carrier thread!");
2915 return JNIHandles::make_local(THREAD, jthread);
2916 JVM_END
2917
2918 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2919 oop theThread = thread->vthread();
2920 assert(theThread != (oop)nullptr, "no current thread!");
2921 return JNIHandles::make_local(THREAD, theThread);
2922 JVM_END
2923
2924 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
2925 jobject theThread))
2926 oop threadObj = JNIHandles::resolve(theThread);
2927 thread->set_vthread(threadObj);
2928
2929 // Set _monitor_owner_id of new current Thread
2930 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
2931
2932 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
2933 JVM_END
2934
2935 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
2936 return ThreadIdentifier::unsafe_offset();
2937 JVM_END
2938
2939 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2940 ThreadsListHandle tlh(thread);
2941 JavaThread* receiver = nullptr;
2942 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
2943 if (is_alive) {
2944 // jthread refers to a live JavaThread.
2945 receiver->interrupt();
2946 }
2947 JVM_END
2948
2949 // Return true iff the current thread has locked the object passed in
2950
2951 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
2952 if (obj == nullptr) {
2953 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
2954 }
2955 Handle h_obj(THREAD, JNIHandles::resolve(obj));
2956 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
2957 JVM_END
2958
2959 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
2960 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
2961 return JNIHandles::make_local(THREAD, trace);
2962 JVM_END
2963
2964 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
2965 // We don't use a ThreadsListHandle here because the current thread
2966 // must be alive.
2967 oop java_thread = JNIHandles::resolve_non_null(jthread);
2968 JavaThread* thr = java_lang_Thread::thread(java_thread);
2969 if (thread == thr && !thr->has_attached_via_jni()) {
2970 // Thread naming is only supported for the current thread and
2971 // we don't set the name of an attached thread to avoid stepping
2972 // on other programs.
2973 ResourceMark rm(thread);
2974 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2975 os::set_native_thread_name(thread_name);
2976 }
2977 JVM_END
2978
2979 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
2980 oop theCache = thread->scopedValueCache();
2981 return JNIHandles::make_local(THREAD, theCache);
2982 JVM_END
2983
2984 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
2985 jobject theCache))
2986 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
2987 thread->set_scopedValueCache(objs);
2988 JVM_END
2989
2990
2991 // java.lang.Package ////////////////////////////////////////////////////////////////
2992
2993
2994 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
2995 ResourceMark rm(THREAD);
2996 JvmtiVMObjectAllocEventCollector oam;
2997 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2998 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
2999 return (jstring) JNIHandles::make_local(THREAD, result);
3000 JVM_END
3001
3002
3003 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3004 JvmtiVMObjectAllocEventCollector oam;
3005 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3006 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3007 JVM_END
3008
3009
3010 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3011
3012
3013 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3014 MonitorLocker ml(Heap_lock);
3015 oop ref = Universe::reference_pending_list();
3016 if (ref != nullptr) {
3017 Universe::clear_reference_pending_list();
3018 }
3019 return JNIHandles::make_local(THREAD, ref);
3020 JVM_END
3021
3022 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3023 MonitorLocker ml(Heap_lock);
3024 return Universe::has_reference_pending_list();
3025 JVM_END
3026
3027 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3028 MonitorLocker ml(Heap_lock);
3029 while (!Universe::has_reference_pending_list()) {
3030 ml.wait();
3031 }
3032 JVM_END
3033
3034 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3035 oop ref_oop = JNIHandles::resolve_non_null(ref);
3036 // PhantomReference has it's own implementation of refersTo().
3037 // See: JVM_PhantomReferenceRefersTo
3038 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3039 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3040 return referent == JNIHandles::resolve(o);
3041 JVM_END
3042
3043 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3044 oop ref_oop = JNIHandles::resolve_non_null(ref);
3045 // FinalReference has it's own implementation of clear().
3046 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3047 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3048 // If the referent has already been cleared then done.
3049 // However, if the referent is dead but has not yet been cleared by
3050 // concurrent reference processing, it should NOT be cleared here.
3051 // Instead, clearing should be left to the GC. Clearing it here could
3052 // detectably lose an expected notification, which is impossible with
3053 // STW reference processing. The clearing in enqueue() doesn't have
3054 // this problem, since the enqueue covers the notification, but it's not
3055 // worth the effort to handle that case specially.
3056 return;
3057 }
3058 java_lang_ref_Reference::clear_referent(ref_oop);
3059 JVM_END
3060
3061
3062 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3063
3064
3065 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3066 oop ref_oop = JNIHandles::resolve_non_null(ref);
3067 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3068 return referent == JNIHandles::resolve(o);
3069 JVM_END
3070
3071
3072 // ObjectInputStream ///////////////////////////////////////////////////////////////
3073
3074 // Return the first user-defined class loader up the execution stack, or null
3075 // if only code from the bootstrap or platform class loader is on the stack.
3076
3077 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3078 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3079 InstanceKlass* ik = vfst.method()->method_holder();
3080 oop loader = ik->class_loader();
3081 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3082 return JNIHandles::make_local(THREAD, loader);
3083 }
3084 }
3085 return nullptr;
3086 JVM_END
3087
3088
3089 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3090
3091
3092 // resolve array handle and check arguments
3093 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3094 if (arr == nullptr) {
3095 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3096 }
3097 oop a = JNIHandles::resolve_non_null(arr);
3098 if (!a->is_array()) {
3099 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3100 } else if (type_array_only && !a->is_typeArray()) {
3101 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3102 }
3103 return arrayOop(a);
3104 }
3105
3106
3107 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3108 arrayOop a = check_array(env, arr, false, CHECK_0);
3109 return a->length();
3110 JVM_END
3111
3112
3113 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3114 JvmtiVMObjectAllocEventCollector oam;
3115 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3116 jvalue value;
3117 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3118 oop box = Reflection::box(&value, type, CHECK_NULL);
3119 return JNIHandles::make_local(THREAD, box);
3120 JVM_END
3121
3122
3123 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3124 jvalue value;
3125 value.i = 0; // to initialize value before getting used in CHECK
3126 arrayOop a = check_array(env, arr, true, CHECK_(value));
3127 assert(a->is_typeArray(), "just checking");
3128 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3129 BasicType wide_type = (BasicType) wCode;
3130 if (type != wide_type) {
3131 Reflection::widen(&value, type, wide_type, CHECK_(value));
3132 }
3133 return value;
3134 JVM_END
3135
3136
3137 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3138 arrayOop a = check_array(env, arr, false, CHECK);
3139 oop box = JNIHandles::resolve(val);
3140 jvalue value;
3141 value.i = 0; // to initialize value before getting used in CHECK
3142 BasicType value_type;
3143 if (a->is_objArray()) {
3144 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3145 value_type = Reflection::unbox_for_regular_object(box, &value);
3146 } else {
3147 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3148 }
3149 Reflection::array_set(&value, a, index, value_type, CHECK);
3150 JVM_END
3151
3152
3153 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3154 arrayOop a = check_array(env, arr, true, CHECK);
3155 assert(a->is_typeArray(), "just checking");
3156 BasicType value_type = (BasicType) vCode;
3157 Reflection::array_set(&v, a, index, value_type, CHECK);
3158 JVM_END
3159
3160
3161 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3162 JvmtiVMObjectAllocEventCollector oam;
3163 oop element_mirror = JNIHandles::resolve(eltClass);
3164 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3165 return JNIHandles::make_local(THREAD, result);
3166 JVM_END
3167
3168
3169 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3170 JvmtiVMObjectAllocEventCollector oam;
3171 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3172 oop element_mirror = JNIHandles::resolve(eltClass);
3173 assert(dim_array->is_typeArray(), "just checking");
3174 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3175 return JNIHandles::make_local(THREAD, result);
3176 JVM_END
3177
3178
3179 // Library support ///////////////////////////////////////////////////////////////////////////
3180
3181 JVM_LEAF(void*, JVM_LoadZipLibrary())
3182 return ZipLibrary::handle();
3183 JVM_END
3184
3185 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3186 //%note jvm_ct
3187 char ebuf[1024];
3188 void *load_result;
3189 {
3190 ThreadToNativeFromVM ttnfvm(thread);
3191 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3192 }
3193 if (load_result == nullptr) {
3194 if (throwException) {
3195 char msg[1024];
3196 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3197 // Since 'ebuf' may contain a string encoded using
3198 // platform encoding scheme, we need to pass
3199 // Exceptions::unsafe_to_utf8 to the new_exception method
3200 // as the last argument. See bug 6367357.
3201 Handle h_exception =
3202 Exceptions::new_exception(thread,
3203 vmSymbols::java_lang_UnsatisfiedLinkError(),
3204 msg, Exceptions::unsafe_to_utf8);
3205
3206 THROW_HANDLE_NULL(h_exception);
3207 } else {
3208 log_info(library)("Failed to load library %s", name);
3209 return load_result;
3210 }
3211 }
3212 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3213 return load_result;
3214 JVM_END
3215
3216
3217 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3218 os::dll_unload(handle);
3219 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3220 JVM_END
3221
3222
3223 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3224 void* find_result = os::dll_lookup(handle, name);
3225 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3226 find_result != nullptr ? "Found" : "Failed to find",
3227 name, p2i(handle));
3228 return find_result;
3229 JVM_END
3230
3231
3232 // JNI version ///////////////////////////////////////////////////////////////////////////////
3233
3234 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3235 return Threads::is_supported_jni_version_including_1_1(version);
3236 JVM_END
3237
3238
3239 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3240 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3241 JVM_END
3242
3243 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3244 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3245 JVM_END
3246
3247 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3248 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3249 JVM_END
3250
3251 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3252 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3253 JVM_END
3254
3255 // String support ///////////////////////////////////////////////////////////////////////////
3256
3257 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3258 JvmtiVMObjectAllocEventCollector oam;
3259 if (str == nullptr) return nullptr;
3260 oop string = JNIHandles::resolve_non_null(str);
3261 oop result = StringTable::intern(string, CHECK_NULL);
3262 return (jstring) JNIHandles::make_local(THREAD, result);
3263 JVM_END
3264
3265
3266 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3267
3268 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3269 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3270 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3271 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3272 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3273 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3274
3275
3276 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3277 VM_Exit::block_if_vm_exited();
3278 return new PlatformMutex();
3279 }
3280
3281
3282 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3283 VM_Exit::block_if_vm_exited();
3284 delete ((PlatformMutex*) mon);
3285 }
3286
3287
3288 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3289 VM_Exit::block_if_vm_exited();
3290 ((PlatformMutex*) mon)->lock();
3291 return 0;
3292 }
3293
3294
3295 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3296 VM_Exit::block_if_vm_exited();
3297 ((PlatformMutex*) mon)->unlock();
3298 }
3299
3300
3301 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3302
3303 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3304 Handle loader, jboolean throwError, TRAPS) {
3305 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3306
3307 // Check if we should initialize the class
3308 if (init && klass->is_instance_klass()) {
3309 klass->initialize(CHECK_NULL);
3310 }
3311 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3312 }
3313
3314
3315 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3316
3317 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3318 Handle method_handle;
3319 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3320 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3321 Handle receiver(THREAD, JNIHandles::resolve(obj));
3322 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3323 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3324 jobject res = JNIHandles::make_local(THREAD, result);
3325 if (JvmtiExport::should_post_vm_object_alloc()) {
3326 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3327 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3328 if (java_lang_Class::is_primitive(ret_type)) {
3329 // Only for primitive type vm allocates memory for java object.
3330 // See box() method.
3331 JvmtiExport::post_vm_object_alloc(thread, result);
3332 }
3333 }
3334 return res;
3335 } else {
3336 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3337 }
3338 JVM_END
3339
3340
3341 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3342 oop constructor_mirror = JNIHandles::resolve(c);
3343 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3344 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3345 jobject res = JNIHandles::make_local(THREAD, result);
3346 if (JvmtiExport::should_post_vm_object_alloc()) {
3347 JvmtiExport::post_vm_object_alloc(thread, result);
3348 }
3349 return res;
3350 JVM_END
3351
3352 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3353 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3354 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3355 JVM_END
3356
3357 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3358 jclass caller,
3359 jstring interfaceMethodName,
3360 jobject factoryType,
3361 jobject interfaceMethodType,
3362 jobject implementationMember,
3363 jobject dynamicMethodType,
3364 jclass lambdaProxyClass))
3365 #if INCLUDE_CDS
3366 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3367 return;
3368 }
3369
3370 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3371 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3372 if (caller_ik->is_hidden()) {
3373 // Hidden classes not of type lambda proxy classes are currently not being archived.
3374 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3375 // registered for archiving.
3376 return;
3377 }
3378 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3379 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3380 assert(lambda_ik->is_hidden(), "must be a hidden class");
3381 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3382
3383 Symbol* interface_method_name = nullptr;
3384 if (interfaceMethodName != nullptr) {
3385 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3386 }
3387 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3388 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3389
3390 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3391 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3392
3393 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3394 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3395 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3396
3397 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3398 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3399
3400 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3401 interface_method_type, m, dynamic_method_type, THREAD);
3402 #endif // INCLUDE_CDS
3403 JVM_END
3404
3405 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3406 jclass caller,
3407 jstring interfaceMethodName,
3408 jobject factoryType,
3409 jobject interfaceMethodType,
3410 jobject implementationMember,
3411 jobject dynamicMethodType))
3412 #if INCLUDE_CDS
3413
3414 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3415 implementationMember == nullptr || dynamicMethodType == nullptr) {
3416 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3417 }
3418
3419 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3420 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3421 if (!caller_ik->is_shared()) {
3422 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3423 return nullptr;
3424 }
3425
3426 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3427 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3428 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3429
3430 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3431 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3432
3433 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3434 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3435 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3436
3437 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3438 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3439
3440 InstanceKlass* loaded_lambda =
3441 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3442 interface_method_type, m, dynamic_method_type,
3443 CHECK_(nullptr));
3444 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3445 #else
3446 return nullptr;
3447 #endif // INCLUDE_CDS
3448 JVM_END
3449
3450 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3451 if (CDSConfig::is_dumping_static_archive()) {
3452 // We do this so that the default CDS archive can be deterministic.
3453 const char* release = VM_Version::vm_release();
3454 const char* dbg_level = VM_Version::jdk_debug_level();
3455 const char* version = VM_Version::internal_vm_info_string();
3456 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3457 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3458 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3459 seed += (jlong)VM_Version::vm_major_version();
3460 seed += (jlong)VM_Version::vm_minor_version();
3461 seed += (jlong)VM_Version::vm_security_version();
3462 seed += (jlong)VM_Version::vm_patch_version();
3463 if (seed == 0) { // don't let this ever be zero.
3464 seed = 0x87654321;
3465 }
3466 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3467 return seed;
3468 } else {
3469 return 0;
3470 }
3471 JVM_END
3472
3473 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3474 return CDSConfig::get_status();
3475 JVM_END
3476
3477 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3478 #if INCLUDE_CDS
3479 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3480 if (line != nullptr) {
3481 ResourceMark rm(THREAD);
3482 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3483 char* c_line = java_lang_String::as_utf8_string(h_line());
3484 if (CDSConfig::is_dumping_dynamic_archive()) {
3485 // Note: LambdaFormInvokers::append take same format which is not
3486 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3487 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3488 }
3489 if (ClassListWriter::is_enabled()) {
3490 ClassListWriter w;
3491 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3492 }
3493 }
3494 #endif // INCLUDE_CDS
3495 JVM_END
3496
3497 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3498 #if INCLUDE_CDS
3499 ResourceMark rm(THREAD);
3500 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3501 char* file_name = java_lang_String::as_utf8_string(file_handle());
3502 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3503 #endif // INCLUDE_CDS
3504 JVM_END
3505
3506 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3507 #if INCLUDE_CDS
3508 ResourceMark rm(THREAD);
3509 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3510 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3511 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3512 #endif // INCLUDE_CDS
3513 JVM_END
3514
3515 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3516 #if INCLUDE_CDS
3517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3518 if (!k->is_instance_klass()) {
3519 return false;
3520 } else {
3521 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3522 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3523 // This class will be cached in AOT-initialized state. No need for init barriers.
3524 return false;
3525 } else {
3526 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3527 // must emit barriers to ensure class initialization during production run.
3528 ResourceMark rm(THREAD);
3529 log_debug(cds)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3530 return true;
3531 }
3532 }
3533 #else
3534 return false;
3535 #endif // INCLUDE_CDS
3536 JVM_END
3537
3538 // Returns an array of all live Thread objects (VM internal JavaThreads,
3539 // jvmti agent threads, and JNI attaching threads are skipped)
3540 // See CR 6404306 regarding JNI attaching threads
3541 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3542 ResourceMark rm(THREAD);
3543 ThreadsListEnumerator tle(THREAD, false, false);
3544 JvmtiVMObjectAllocEventCollector oam;
3545
3546 int num_threads = tle.num_threads();
3547 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3548 objArrayHandle threads_ah(THREAD, r);
3549
3550 for (int i = 0; i < num_threads; i++) {
3551 Handle h = tle.get_threadObj(i);
3552 threads_ah->obj_at_put(i, h());
3553 }
3554
3555 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3556 JVM_END
3557
3558
3559 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3560 // Return StackTraceElement[][], each element is the stack trace of a thread in
3561 // the corresponding entry in the given threads array
3562 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3563 JvmtiVMObjectAllocEventCollector oam;
3564
3565 // Check if threads is null
3566 if (threads == nullptr) {
3567 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3568 }
3569
3570 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3571 objArrayHandle ah(THREAD, a);
3572 int num_threads = ah->length();
3573 // check if threads is non-empty array
3574 if (num_threads == 0) {
3575 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3576 }
3577
3578 // check if threads is not an array of objects of Thread class
3579 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3580 if (k != vmClasses::Thread_klass()) {
3581 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3582 }
3583
3584 ResourceMark rm(THREAD);
3585
3586 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3587 for (int i = 0; i < num_threads; i++) {
3588 oop thread_obj = ah->obj_at(i);
3589 instanceHandle h(THREAD, (instanceOop) thread_obj);
3590 thread_handle_array->append(h);
3591 }
3592
3593 // The JavaThread references in thread_handle_array are validated
3594 // in VM_ThreadDump::doit().
3595 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3596 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3597
3598 JVM_END
3599
3600 // JVM monitoring and management support
3601 JVM_LEAF(void*, JVM_GetManagement(jint version))
3602 return Management::get_jmm_interface(version);
3603 JVM_END
3604
3605 // com.sun.tools.attach.VirtualMachine agent properties support
3606 //
3607 // Initialize the agent properties with the properties maintained in the VM
3608 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3609 ResourceMark rm;
3610
3611 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3612
3613 PUTPROP(props, "sun.java.command", Arguments::java_command());
3614 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3615 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3616 return properties;
3617 JVM_END
3618
3619 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3620 {
3621 JvmtiVMObjectAllocEventCollector oam;
3622
3623 if (ofClass == nullptr) {
3624 return nullptr;
3625 }
3626 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3627 // Special handling for primitive objects
3628 if (java_lang_Class::is_primitive(mirror())) {
3629 return nullptr;
3630 }
3631 Klass* k = java_lang_Class::as_Klass(mirror());
3632 if (!k->is_instance_klass()) {
3633 return nullptr;
3634 }
3635 InstanceKlass* ik = InstanceKlass::cast(k);
3636 int encl_method_class_idx = ik->enclosing_method_class_index();
3637 if (encl_method_class_idx == 0) {
3638 return nullptr;
3639 }
3640 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3641 objArrayHandle dest(THREAD, dest_o);
3642 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3643 dest->obj_at_put(0, enc_k->java_mirror());
3644 int encl_method_method_idx = ik->enclosing_method_method_index();
3645 if (encl_method_method_idx != 0) {
3646 Symbol* sym = ik->constants()->symbol_at(
3647 extract_low_short_from_int(
3648 ik->constants()->name_and_type_at(encl_method_method_idx)));
3649 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3650 dest->obj_at_put(1, str());
3651 sym = ik->constants()->symbol_at(
3652 extract_high_short_from_int(
3653 ik->constants()->name_and_type_at(encl_method_method_idx)));
3654 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3655 dest->obj_at_put(2, str());
3656 }
3657 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3658 }
3659 JVM_END
3660
3661 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3662 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3663 ResourceMark rm(THREAD);
3664
3665 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3666 return nullptr;
3667 }
3668
3669 char** vm_flags = Arguments::jvm_flags_array();
3670 char** vm_args = Arguments::jvm_args_array();
3671 int num_flags = Arguments::num_jvm_flags();
3672 int num_args = Arguments::num_jvm_args();
3673
3674 InstanceKlass* ik = vmClasses::String_klass();
3675 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3676 objArrayHandle result_h(THREAD, r);
3677
3678 int index = 0;
3679 for (int j = 0; j < num_flags; j++, index++) {
3680 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3681 result_h->obj_at_put(index, h());
3682 }
3683 for (int i = 0; i < num_args; i++, index++) {
3684 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3685 result_h->obj_at_put(index, h());
3686 }
3687 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3688 JVM_END
3689
3690 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3691 return os::get_signal_number(name);
3692 JVM_END
3693
3694 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3695 #if INCLUDE_JVMTI
3696 if (!DoJVMTIVirtualThreadTransitions) {
3697 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3698 return;
3699 }
3700 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3701 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3702 } else {
3703 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3704 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3705 }
3706 #endif
3707 JVM_END
3708
3709 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3710 #if INCLUDE_JVMTI
3711 if (!DoJVMTIVirtualThreadTransitions) {
3712 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3713 return;
3714 }
3715 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3716 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3717 } else {
3718 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3719 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3720 }
3721 #endif
3722 JVM_END
3723
3724 // If notifications are disabled then just update the VTMS transition bit and return.
3725 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3726 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
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_mount(vthread, hide);
3734 } else {
3735 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3736 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3737 }
3738 #endif
3739 JVM_END
3740
3741 // If notifications are disabled then just update the VTMS transition bit and return.
3742 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3743 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3744 #if INCLUDE_JVMTI
3745 if (!DoJVMTIVirtualThreadTransitions) {
3746 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3747 return;
3748 }
3749 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3750 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3751 } else {
3752 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3753 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3754 }
3755 #endif
3756 JVM_END
3757
3758 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3759 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3760 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3761 #if INCLUDE_JVMTI
3762 if (!DoJVMTIVirtualThreadTransitions) {
3763 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3764 return;
3765 }
3766 assert(thread->is_disable_suspend() != (bool)enter,
3767 "nested or unbalanced monitor enter/exit is not allowed");
3768 thread->toggle_is_disable_suspend();
3769 #endif
3770 JVM_END
3771
3772 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3773 #if INCLUDE_JFR
3774 freeze_result result = THREAD->last_freeze_fail_result();
3775 assert(result != freeze_ok, "sanity check");
3776 EventVirtualThreadPinned event(UNTIMED);
3777 event.set_starttime(THREAD->last_freeze_fail_time());
3778 if (event.should_commit()) {
3779 ResourceMark rm(THREAD);
3780 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3781 THREAD->post_vthread_pinned_event(&event, str, result);
3782 }
3783 #endif
3784 JVM_END
3785
3786 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3787 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3788 assert(parkEvent != nullptr, "not initialized");
3789
3790 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3791 oop vthread_head = nullptr;
3792 while (true) {
3793 if (list_head.peek() != nullptr) {
3794 for (;;) {
3795 oop head = list_head.resolve();
3796 if (list_head.cmpxchg(head, nullptr) == head) {
3797 return JNIHandles::make_local(THREAD, head);
3798 }
3799 }
3800 }
3801 ThreadBlockInVM tbivm(THREAD);
3802 parkEvent->park();
3803 }
3804 JVM_END
3805 /*
3806 * Return the current class's class file version. The low order 16 bits of the
3807 * returned jint contain the class's major version. The high order 16 bits
3808 * contain the class's minor version.
3809 */
3810 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3811 oop mirror = JNIHandles::resolve_non_null(current);
3812 if (java_lang_Class::is_primitive(mirror)) {
3813 // return latest major version and minor version of 0.
3814 return JVM_CLASSFILE_MAJOR_VERSION;
3815 }
3816 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
3817
3818 Klass* c = java_lang_Class::as_Klass(mirror);
3819 assert(c->is_instance_klass(), "must be");
3820 InstanceKlass* ik = InstanceKlass::cast(c);
3821 return (ik->minor_version() << 16) | ik->major_version();
3822 JVM_END
3823
3824 /*
3825 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3826 * get the value will see a materialized value and not a scalar-replaced
3827 * null value.
3828 */
3829 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3830 JVM_EnsureMaterializedForStackWalk(env, value);
3831 JVM_END
3832
3833 /*
3834 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3835 */
3836 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3837 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3838 JVM_END