1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/aotMetaspace.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/classListParser.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/dynamicArchive.hpp"
31 #include "cds/heapShared.hpp"
32 #include "cds/lambdaFormInvokers.hpp"
33 #include "cds/lambdaProxyClassDictionary.hpp"
34 #include "classfile/classFileStream.hpp"
35 #include "classfile/classLoader.inline.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/method.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "oops/recordComponent.hpp"
68 #include "prims/foreignGlobals.hpp"
69 #include "prims/jvm_misc.hpp"
70 #include "prims/jvmtiExport.hpp"
71 #include "prims/jvmtiThreadState.inline.hpp"
72 #include "prims/stackwalk.hpp"
73 #include "runtime/arguments.hpp"
74 #include "runtime/atomicAccess.hpp"
75 #include "runtime/continuation.hpp"
76 #include "runtime/deoptimization.hpp"
77 #include "runtime/globals_extension.hpp"
78 #include "runtime/handles.inline.hpp"
79 #include "runtime/handshake.hpp"
80 #include "runtime/init.hpp"
81 #include "runtime/interfaceSupport.inline.hpp"
82 #include "runtime/java.hpp"
83 #include "runtime/javaCalls.hpp"
84 #include "runtime/javaThread.hpp"
85 #include "runtime/jfieldIDWorkaround.hpp"
86 #include "runtime/jniHandles.inline.hpp"
87 #include "runtime/os.inline.hpp"
88 #include "runtime/osThread.hpp"
89 #include "runtime/perfData.hpp"
90 #include "runtime/reflection.hpp"
91 #include "runtime/synchronizer.hpp"
92 #include "runtime/threadIdentifier.hpp"
93 #include "runtime/threadSMR.hpp"
94 #include "runtime/vframe.inline.hpp"
95 #include "runtime/vm_version.hpp"
96 #include "runtime/vmOperations.hpp"
97 #include "services/attachListener.hpp"
98 #include "services/management.hpp"
99 #include "services/threadService.hpp"
100 #include "utilities/checkedCast.hpp"
101 #include "utilities/copy.hpp"
102 #include "utilities/defaultStream.hpp"
103 #include "utilities/dtrace.hpp"
104 #include "utilities/events.hpp"
105 #include "utilities/macros.hpp"
106 #include "utilities/utf8.hpp"
107 #include "utilities/zipLibrary.hpp"
108 #if INCLUDE_CDS
109 #include "classfile/systemDictionaryShared.hpp"
110 #endif
111 #if INCLUDE_JFR
112 #include "jfr/jfr.hpp"
113 #endif
114 #if INCLUDE_MANAGEMENT
115 #include "services/finalizerService.hpp"
116 #endif
117 #ifdef LINUX
118 #include "osContainer_linux.hpp"
119 #endif
120
121 #include <errno.h>
122
123 /*
124 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
125 such ctors and calls MUST NOT come between an oop declaration/init and its
126 usage because if objects are move this may cause various memory stomps, bus
127 errors and segfaults. Here is a cookbook for causing so called "naked oop
128 failures":
129
130 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
131 // Object address to be held directly in mirror & not visible to GC
132 oop mirror = JNIHandles::resolve_non_null(ofClass);
133
134 // If this ctor can hit a safepoint, moving objects around, then
135 ComplexConstructor foo;
136
137 // Boom! mirror may point to JUNK instead of the intended object
138 (some dereference of mirror)
139
140 // Here's another call that may block for GC, making mirror stale
141 MutexLocker ml(some_lock);
142
143 // And here's an initializer that can result in a stale oop
144 // all in one step.
145 oop o = call_that_can_throw_exception(TRAPS);
146
147
148 The solution is to keep the oop declaration BELOW the ctor or function
149 call that might cause a GC, do another resolve to reassign the oop, or
150 consider use of a Handle instead of an oop so there is immunity from object
151 motion. But note that the "QUICK" entries below do not have a handlemark
152 and thus can only support use of handles passed in.
153 */
154
155 extern void trace_class_resolution(Klass* to_class) {
156 ResourceMark rm;
157 int line_number = -1;
158 const char * source_file = nullptr;
159 const char * trace = "explicit";
160 InstanceKlass* caller = nullptr;
161 JavaThread* jthread = JavaThread::current();
162 if (jthread->has_last_Java_frame()) {
163 vframeStream vfst(jthread);
164
165 // Scan up the stack skipping ClassLoader frames.
166 Method* last_caller = nullptr;
167
168 while (!vfst.at_end()) {
169 Method* m = vfst.method();
170 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
171 break;
172 }
173 last_caller = m;
174 vfst.next();
175 }
176 // if this is called from Class.forName0 and that is called from Class.forName,
177 // then print the caller of Class.forName. If this is Class.loadClass, then print
178 // that caller, otherwise keep quiet since this should be picked up elsewhere.
179 bool found_it = false;
180 if (!vfst.at_end() &&
181 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
182 vfst.method()->name() == vmSymbols::forName0_name()) {
183 vfst.next();
184 if (!vfst.at_end() &&
185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
186 vfst.method()->name() == vmSymbols::forName_name()) {
187 vfst.next();
188 found_it = true;
189 }
190 } else if (last_caller != nullptr &&
191 last_caller->method_holder()->name() ==
192 vmSymbols::java_lang_ClassLoader() &&
193 last_caller->name() == vmSymbols::loadClass_name()) {
194 found_it = true;
195 } else if (!vfst.at_end()) {
196 if (vfst.method()->is_native()) {
197 // JNI call
198 found_it = true;
199 }
200 }
201 if (found_it && !vfst.at_end()) {
202 // found the caller
203 caller = vfst.method()->method_holder();
204 line_number = vfst.method()->line_number_from_bci(vfst.bci());
205 if (line_number == -1) {
206 // show method name if it's a native method
207 trace = vfst.method()->name_and_sig_as_C_string();
208 }
209 Symbol* s = caller->source_file_name();
210 if (s != nullptr) {
211 source_file = s->as_C_string();
212 }
213 }
214 }
215 if (caller != nullptr) {
216 if (to_class != caller) {
217 const char * from = caller->external_name();
218 const char * to = to_class->external_name();
219 // print in a single call to reduce interleaving between threads
220 if (source_file != nullptr) {
221 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
222 } else {
223 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
224 }
225 }
226 }
227 }
228
229 // java.lang.System //////////////////////////////////////////////////////////////////////
230
231
232 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
233 return os::javaTimeMillis();
234 JVM_END
235
236 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
237 return os::javaTimeNanos();
238 JVM_END
239
240 // The function below is actually exposed by jdk.internal.misc.VM and not
241 // java.lang.System, but we choose to keep it here so that it stays next
242 // to JVM_CurrentTimeMillis and JVM_NanoTime
243
244 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
245 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
246
247 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
248 jlong seconds;
249 jlong nanos;
250
251 os::javaTimeSystemUTC(seconds, nanos);
252
253 // We're going to verify that the result can fit in a long.
254 // For that we need the difference in seconds between 'seconds'
255 // and 'offset_secs' to be such that:
256 // |seconds - offset_secs| < (2^63/10^9)
257 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
258 // which makes |seconds - offset_secs| < 2^33
259 // and we will prefer +/- 2^32 as the maximum acceptable diff
260 // as 2^32 has a more natural feel than 2^33...
261 //
262 // So if |seconds - offset_secs| >= 2^32 - we return a special
263 // sentinel value (-1) which the caller should take as an
264 // exception value indicating that the offset given to us is
265 // too far from range of the current time - leading to too big
266 // a nano adjustment. The caller is expected to recover by
267 // computing a more accurate offset and calling this method
268 // again. (For the record 2^32 secs is ~136 years, so that
269 // should rarely happen)
270 //
271 jlong diff = seconds - offset_secs;
272 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
273 return -1; // sentinel value: the offset is too far off the target
274 }
275
276 // return the adjustment. If you compute a time by adding
277 // this number of nanoseconds along with the number of seconds
278 // in the offset you should get the current UTC time.
279 return (diff * (jlong)1000000000) + nanos;
280 JVM_END
281
282 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
283 jobject dst, jint dst_pos, jint length))
284 // Check if we have null pointers
285 if (src == nullptr || dst == nullptr) {
286 THROW(vmSymbols::java_lang_NullPointerException());
287 }
288 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
289 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
290 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
291 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
292 // Do copy
293 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
294 JVM_END
295
296
297 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
298 JavaValue r(T_OBJECT);
299 // public synchronized Object put(Object key, Object value);
300 HandleMark hm(THREAD);
301 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
302 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
303 JavaCalls::call_virtual(&r,
304 props,
305 vmClasses::Properties_klass(),
306 vmSymbols::put_name(),
307 vmSymbols::object_object_object_signature(),
308 key_str,
309 value_str,
310 THREAD);
311 }
312
313
314 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
315
316 /*
317 * Return all of the system properties in a Java String array with alternating
318 * names and values from the jvm SystemProperty.
319 * Which includes some internal and all commandline -D defined properties.
320 */
321 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
322 ResourceMark rm(THREAD);
323 HandleMark hm(THREAD);
324 int ndx = 0;
325 int fixedCount = 2;
326
327 SystemProperty* p = Arguments::system_properties();
328 int count = Arguments::PropertyList_count(p);
329
330 // Allocate result String array
331 InstanceKlass* ik = vmClasses::String_klass();
332 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
333 objArrayHandle result_h(THREAD, r);
334
335 while (p != nullptr) {
336 const char * key = p->key();
337 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
338 const char * value = p->value();
339 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
340 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
341 result_h->obj_at_put(ndx * 2, key_str());
342 result_h->obj_at_put(ndx * 2 + 1, value_str());
343 ndx++;
344 }
345 p = p->next();
346 }
347
348 // Convert the -XX:MaxDirectMemorySize= command line flag
349 // to the sun.nio.MaxDirectMemorySize property.
350 // Do this after setting user properties to prevent people
351 // from setting the value with a -D option, as requested.
352 // Leave empty if not supplied
353 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
354 char as_chars[256];
355 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
356 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
357 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
358 result_h->obj_at_put(ndx * 2, key_str());
359 result_h->obj_at_put(ndx * 2 + 1, value_str());
360 ndx++;
361 }
362
363 // JVM monitoring and management support
364 // Add the sun.management.compiler property for the compiler's name
365 {
366 #undef CSIZE
367 #if defined(_LP64)
368 #define CSIZE "64-Bit "
369 #else
370 #define CSIZE
371 #endif // 64bit
372
373 #if COMPILER1_AND_COMPILER2
374 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
375 #else
376 #if defined(COMPILER1)
377 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
378 #elif defined(COMPILER2)
379 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
380 #elif INCLUDE_JVMCI
381 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
382 #else
383 const char* compiler_name = "";
384 #endif // compilers
385 #endif // COMPILER1_AND_COMPILER2
386
387 if (*compiler_name != '\0' &&
388 (Arguments::mode() != Arguments::_int)) {
389 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
390 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
391 result_h->obj_at_put(ndx * 2, key_str());
392 result_h->obj_at_put(ndx * 2 + 1, value_str());
393 ndx++;
394 }
395 }
396
397 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
398 JVM_END
399
400
401 /*
402 * Return the temporary directory that the VM uses for the attach
403 * and perf data files.
404 *
405 * It is important that this directory is well-known and the
406 * same for all VM instances. It cannot be affected by configuration
407 * variables such as java.io.tmpdir.
408 */
409 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
410 HandleMark hm(THREAD);
411 const char* temp_dir = os::get_temp_directory();
412 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
413 return (jstring) JNIHandles::make_local(THREAD, h());
414 JVM_END
415
416
417 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
418
419 extern volatile jint vm_created;
420
421 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
422 EventShutdown event;
423 if (event.should_commit()) {
424 event.set_reason("Shutdown requested from Java");
425 event.commit();
426 }
427 JVM_END
428
429
430 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
431 before_exit(thread, true);
432 vm_exit(code);
433 JVM_END
434
435
436 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
437 if (!DisableExplicitGC) {
438 EventSystemGC event;
439 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
440 Universe::heap()->collect(GCCause::_java_lang_system_gc);
441 event.commit();
442 }
443 JVM_END
444
445
446 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
447 return Universe::heap()->millis_since_last_whole_heap_examined();
448 JVM_END
449
450
451 static inline jlong convert_size_t_to_jlong(size_t val) {
452 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
453 NOT_LP64 (return (jlong)val;)
454 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
455 }
456
457 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
458 size_t n = Universe::heap()->capacity();
459 return convert_size_t_to_jlong(n);
460 JVM_END
461
462
463 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
464 size_t n = Universe::heap()->unused();
465 return convert_size_t_to_jlong(n);
466 JVM_END
467
468
469 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
470 size_t n = Universe::heap()->max_capacity();
471 return convert_size_t_to_jlong(n);
472 JVM_END
473
474
475 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
476 return os::active_processor_count();
477 JVM_END
478
479 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
480 #ifdef LINUX
481 if (UseContainerSupport) {
482 return JNI_TRUE;
483 }
484 #endif
485 return JNI_FALSE;
486 JVM_END
487
488 JVM_LEAF(jboolean, JVM_IsContainerized(void))
489 #ifdef LINUX
490 if (OSContainer::is_containerized()) {
491 return JNI_TRUE;
492 }
493 #endif
494 return JNI_FALSE;
495 JVM_END
496
497 // java.lang.Throwable //////////////////////////////////////////////////////
498
499 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
500 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
501 java_lang_Throwable::fill_in_stack_trace(exception);
502 JVM_END
503
504 // java.lang.NullPointerException ///////////////////////////////////////////
505
506 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
507 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
508
509 oop exc = JNIHandles::resolve_non_null(throwable);
510
511 Method* method;
512 int bci;
513 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
514 return nullptr;
515 }
516 if (method->is_native()) {
517 return nullptr;
518 }
519
520 stringStream ss;
521 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
522 if (ok) {
523 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
524 return (jstring) JNIHandles::make_local(THREAD, result);
525 } else {
526 return nullptr;
527 }
528 JVM_END
529
530 // java.lang.StackTraceElement //////////////////////////////////////////////
531
532
533 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
534 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
535 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
536 objArrayHandle stack_trace(THREAD, st);
537 // Fill in the allocated stack trace
538 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
539 JVM_END
540
541
542 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
543 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
544 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
545 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
546 JVM_END
547
548
549 // java.lang.StackWalker //////////////////////////////////////////////////////
550 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
551 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
552
553 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
554 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
555 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
556 if (!have_name) {
557 oop name = StringTable::intern(method->name(), CHECK);
558 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
559 }
560 if (!have_type) {
561 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
562 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
563 }
564 JVM_END
565
566 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
567 jint skip_frames, jobject contScope, jobject cont,
568 jint buffer_size, jint start_index, jobjectArray frames))
569 if (!thread->has_last_Java_frame()) {
570 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
571 }
572
573 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
574 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
575 Handle cont_h(THREAD, JNIHandles::resolve(cont));
576 // frames array is a ClassFrameInfo[] array when only getting caller reference,
577 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
578 // be null.
579 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
580 objArrayHandle frames_array_h(THREAD, fa);
581
582 if (frames_array_h->length() < buffer_size) {
583 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
584 }
585
586 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
587 buffer_size, start_index, frames_array_h, CHECK_NULL);
588 return JNIHandles::make_local(THREAD, result);
589 JVM_END
590
591
592 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
593 jint last_batch_count, jint buffer_size, jint start_index,
594 jobjectArray frames))
595 // frames array is a ClassFrameInfo[] array when only getting caller reference,
596 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
597 // be null.
598 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
599 objArrayHandle frames_array_h(THREAD, fa);
600
601 if (frames_array_h->length() < buffer_size) {
602 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
603 }
604
605 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
606 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
607 start_index, frames_array_h, THREAD);
608 JVM_END
609
610 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
611 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
612 objArrayHandle frames_array_h(THREAD, fa);
613 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
614 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
615
616 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
617 JVM_END
618
619 // java.lang.Object ///////////////////////////////////////////////
620
621
622 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
623 // as implemented in the classic virtual machine; return 0 if object is null
624 return handle == nullptr ? 0 :
625 checked_cast<jint>(ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)));
626 JVM_END
627
628
629 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
630 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
631 ObjectSynchronizer::wait(obj, ms, CHECK);
632 JVM_END
633
634
635 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
636 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
637 ObjectSynchronizer::notify(obj, CHECK);
638 JVM_END
639
640
641 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
642 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
643 ObjectSynchronizer::notifyall(obj, CHECK);
644 JVM_END
645
646
647 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
648 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
649 Klass* klass = obj->klass();
650 JvmtiVMObjectAllocEventCollector oam;
651
652 #ifdef ASSERT
653 // Just checking that the cloneable flag is set correct
654 if (obj->is_array()) {
655 guarantee(klass->is_cloneable(), "all arrays are cloneable");
656 } else {
657 guarantee(obj->is_instance(), "should be instanceOop");
658 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
659 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
660 }
661 #endif
662
663 // Check if class of obj supports the Cloneable interface.
664 // All arrays are considered to be cloneable (See JLS 20.1.5).
665 // All j.l.r.Reference classes are considered non-cloneable.
666 if (!klass->is_cloneable() ||
667 (klass->is_instance_klass() &&
668 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
669 ResourceMark rm(THREAD);
670 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
671 }
672
673 // Make shallow object copy
674 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 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
844 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
845 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
846 }
847
848 #if INCLUDE_CDS
849 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
850 InstanceKlass* ik = InstanceKlass::cast(from_class);
851 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
852 }
853 #endif
854
855 return result;
856 JVM_END
857
858 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
859 static jclass jvm_define_class_common(const char *name,
860 jobject loader, const jbyte *buf,
861 jsize len, jobject pd, const char *source,
862 TRAPS) {
863 if (source == nullptr) source = "__JVM_DefineClass__";
864
865 JavaThread* jt = THREAD;
866
867 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
868 ClassLoader::perf_define_appclass_selftime(),
869 ClassLoader::perf_define_appclasses(),
870 jt->get_thread_stat()->perf_recursion_counts_addr(),
871 jt->get_thread_stat()->perf_timers_addr(),
872 PerfClassTraceTime::DEFINE_CLASS);
873
874 if (UsePerfData) {
875 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
876 }
877
878 // Class resolution will get the class name from the .class stream if the name is null.
879 TempNewSymbol class_name = name == nullptr ? nullptr :
880 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
881 CHECK_NULL);
882
883 ResourceMark rm(THREAD);
884 ClassFileStream st((u1*)buf, len, source);
885 Handle class_loader (THREAD, JNIHandles::resolve(loader));
886 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
887 ClassLoadInfo cl_info(protection_domain);
888 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
889 class_loader,
890 cl_info,
891 CHECK_NULL);
892
893 if (log_is_enabled(Debug, class, resolve)) {
894 trace_class_resolution(k);
895 }
896
897 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
898 }
899
900 enum {
901 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
902 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
903 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
904 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
905 };
906
907 /*
908 * Define a class with the specified flags that indicates if it's a nestmate,
909 * hidden, or strongly referenced from class loader.
910 */
911 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
912 const jbyte *buf, jsize len, jobject pd,
913 jboolean init, int flags, jobject classData, TRAPS) {
914 ResourceMark rm(THREAD);
915
916 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
917 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
918 if (lookup_k == nullptr) {
919 // The error message is wrong. We come here only if lookup is a primitive class
920 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
921 }
922
923 Handle class_loader (THREAD, lookup_k->class_loader());
924
925 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
926 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
927 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
928 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
929
930 InstanceKlass* host_class = nullptr;
931 if (is_nestmate) {
932 host_class = lookup_k->nest_host(CHECK_NULL);
933 }
934
935 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
936 name,
937 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
938 is_nestmate ? host_class->external_name() : "",
939 is_hidden ? "hidden" : "not hidden",
940 is_strong ? "strong" : "weak",
941 vm_annotations ? "with vm annotations" : "without vm annotation");
942
943 if (!is_hidden) {
944 // classData is only applicable for hidden classes
945 if (classData != nullptr) {
946 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
947 }
948 if (is_nestmate) {
949 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
950 }
951 if (!is_strong) {
952 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
953 }
954 if (vm_annotations) {
955 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
956 }
957 if (flags != STRONG_LOADER_LINK) {
958 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
959 err_msg("invalid flag 0x%x", flags));
960 }
961 }
962
963 // Class resolution will get the class name from the .class stream if the name is null.
964 TempNewSymbol class_name = name == nullptr ? nullptr :
965 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
966 CHECK_NULL);
967
968 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
969 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
970 ClassFileStream st((u1*)buf, len, source);
971
972 InstanceKlass* ik = nullptr;
973 if (!is_hidden) {
974 ClassLoadInfo cl_info(protection_domain);
975 ik = SystemDictionary::resolve_from_stream(&st, class_name,
976 class_loader,
977 cl_info,
978 CHECK_NULL);
979
980 if (log_is_enabled(Debug, class, resolve)) {
981 trace_class_resolution(ik);
982 }
983 } else { // hidden
984 Handle classData_h(THREAD, JNIHandles::resolve(classData));
985 ClassLoadInfo cl_info(protection_domain,
986 host_class,
987 classData_h,
988 is_hidden,
989 is_strong,
990 vm_annotations);
991 ik = SystemDictionary::resolve_from_stream(&st, class_name,
992 class_loader,
993 cl_info,
994 CHECK_NULL);
995
996 // The hidden class loader data has been artificially been kept alive to
997 // this point. The mirror and any instances of this class have to keep
998 // it alive afterwards.
999 ik->class_loader_data()->dec_keep_alive_ref_count();
1000
1001 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1002 ModuleEntry* module = ik->module();
1003 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1004 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1005 module_name,
1006 ik->external_name(),
1007 host_class->external_name(),
1008 ik->is_hidden() ? "is hidden" : "is not hidden");
1009 }
1010 }
1011
1012 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1013 // non-hidden class or nestmate class must be in the same package as the Lookup class
1014 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1015 }
1016
1017 if (init) {
1018 ik->initialize(CHECK_NULL);
1019 } else {
1020 ik->link_class(CHECK_NULL);
1021 }
1022
1023 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1024 }
1025
1026 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1027 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1028 JVM_END
1029
1030 /*
1031 * Define a class with the specified lookup class.
1032 * lookup: Lookup class
1033 * name: the name of the class
1034 * buf: class bytes
1035 * len: length of class bytes
1036 * pd: protection domain
1037 * init: initialize the class
1038 * flags: properties of the class
1039 * classData: private static pre-initialized field
1040 */
1041 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1042 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1043
1044 if (lookup == nullptr) {
1045 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1046 }
1047
1048 assert(buf != nullptr, "buf must not be null");
1049
1050 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1051 JVM_END
1052
1053 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1054
1055 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1056 JVM_END
1057
1058 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1059 ResourceMark rm(THREAD);
1060
1061 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1062 char* str = java_lang_String::as_utf8_string(h_name());
1063
1064 // Sanity check, don't expect null
1065 if (str == nullptr) return nullptr;
1066
1067 // Internalize the string, converting '.' to '/' in string.
1068 char* p = (char*)str;
1069 while (*p != '\0') {
1070 if (*p == '.') {
1071 *p = '/';
1072 }
1073 p++;
1074 }
1075
1076 const int str_len = (int)(p - str);
1077 if (str_len > Symbol::max_length()) {
1078 // It's impossible to create this class; the name cannot fit
1079 // into the constant pool.
1080 return nullptr;
1081 }
1082 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1083
1084 // Security Note:
1085 // The Java level wrapper will perform the necessary security check allowing
1086 // us to pass the null as the initiating class loader.
1087 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1088 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1089 #if INCLUDE_CDS
1090 if (k == nullptr) {
1091 // If the class is not already loaded, try to see if it's in the shared
1092 // archive for the current classloader (h_loader).
1093 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1094 }
1095 #endif
1096 return (k == nullptr) ? nullptr :
1097 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1098 JVM_END
1099
1100 // Module support //////////////////////////////////////////////////////////////////////////////
1101
1102 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1103 jstring location, jobjectArray packages))
1104 Handle h_module (THREAD, JNIHandles::resolve(module));
1105 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1106 JVM_END
1107
1108 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1109 Handle h_module (THREAD, JNIHandles::resolve(module));
1110 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1111 JVM_END
1112
1113 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1114 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1115 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1116 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1117 JVM_END
1118
1119 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1120 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1121 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1122 JVM_END
1123
1124 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1125 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1126 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1127 JVM_END
1128
1129 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1130 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1131 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1132 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1133 JVM_END
1134
1135 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1136 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1137 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1138 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1139 JVM_END
1140
1141 // Reflection support //////////////////////////////////////////////////////////////////////////////
1142
1143 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1144 assert (cls != nullptr, "illegal class");
1145 JvmtiVMObjectAllocEventCollector oam;
1146 ResourceMark rm(THREAD);
1147 HandleMark hm(THREAD);
1148 Handle java_class(THREAD, JNIHandles::resolve(cls));
1149 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1150 return (jstring) JNIHandles::make_local(THREAD, result);
1151 JVM_END
1152
1153
1154 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1155 JvmtiVMObjectAllocEventCollector oam;
1156 oop mirror = JNIHandles::resolve_non_null(cls);
1157
1158 // Special handling for primitive objects
1159 if (java_lang_Class::is_primitive(mirror)) {
1160 // Primitive objects does not have any interfaces
1161 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1162 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1163 }
1164
1165 Klass* klass = java_lang_Class::as_Klass(mirror);
1166 // Figure size of result array
1167 int size;
1168 if (klass->is_instance_klass()) {
1169 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1170 } else {
1171 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1172 size = 2;
1173 }
1174
1175 // Allocate result array
1176 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1177 objArrayHandle result (THREAD, r);
1178 // Fill in result
1179 if (klass->is_instance_klass()) {
1180 // Regular instance klass, fill in all local interfaces
1181 for (int index = 0; index < size; index++) {
1182 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1183 result->obj_at_put(index, k->java_mirror());
1184 }
1185 } else {
1186 // All arrays implement java.lang.Cloneable and java.io.Serializable
1187 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1188 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1189 }
1190 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1191 JVM_END
1192
1193
1194 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1195 oop mirror = JNIHandles::resolve_non_null(cls);
1196 if (java_lang_Class::is_primitive(mirror)) {
1197 return JNI_FALSE;
1198 }
1199 Klass* k = java_lang_Class::as_Klass(mirror);
1200 return k->is_hidden();
1201 JVM_END
1202
1203
1204 class ScopedValueBindingsResolver {
1205 public:
1206 InstanceKlass* Carrier_klass;
1207 ScopedValueBindingsResolver(JavaThread* THREAD) {
1208 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1209 Carrier_klass = InstanceKlass::cast(k);
1210 }
1211 };
1212
1213 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1214 ResourceMark rm(THREAD);
1215 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1216 JvmtiVMObjectAllocEventCollector oam;
1217
1218 static ScopedValueBindingsResolver resolver(THREAD);
1219
1220 // Iterate through Java frames
1221 vframeStream vfst(thread);
1222 for(; !vfst.at_end(); vfst.next()) {
1223 int loc = -1;
1224 // get method of frame
1225 Method* method = vfst.method();
1226
1227 Symbol *name = method->name();
1228
1229 InstanceKlass* holder = method->method_holder();
1230 if (name == vmSymbols::runWith_method_name()) {
1231 if (holder == vmClasses::Thread_klass()
1232 || holder == resolver.Carrier_klass) {
1233 loc = 1;
1234 }
1235 }
1236
1237 if (loc != -1) {
1238 javaVFrame *frame = vfst.asJavaVFrame();
1239 StackValueCollection* locals = frame->locals();
1240 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1241 Handle result = head_sv->get_obj();
1242 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1243 if (result() != nullptr) {
1244 return JNIHandles::make_local(THREAD, result());
1245 }
1246 }
1247 }
1248
1249 return nullptr;
1250 JVM_END
1251
1252 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1253 JvmtiVMObjectAllocEventCollector oam;
1254 // ofClass is a reference to a java_lang_Class object. The mirror object
1255 // of an InstanceKlass
1256 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1257 if (java_lang_Class::is_primitive(ofMirror) ||
1258 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1259 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1260 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1261 }
1262
1263 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1264 InnerClassesIterator iter(k);
1265
1266 if (iter.length() == 0) {
1267 // Neither an inner nor outer class
1268 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1269 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1270 }
1271
1272 // find inner class info
1273 constantPoolHandle cp(thread, k->constants());
1274 int length = iter.length();
1275
1276 // Allocate temp. result array
1277 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1278 objArrayHandle result (THREAD, r);
1279 int members = 0;
1280
1281 for (; !iter.done(); iter.next()) {
1282 int ioff = iter.inner_class_info_index();
1283 int ooff = iter.outer_class_info_index();
1284
1285 if (ioff != 0 && ooff != 0) {
1286 // Check to see if the name matches the class we're looking for
1287 // before attempting to find the class.
1288 if (cp->klass_name_at_matches(k, ooff)) {
1289 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1290 if (outer_klass == k) {
1291 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1292 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1293
1294 // Throws an exception if outer klass has not declared k as
1295 // an inner klass
1296 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1297
1298 result->obj_at_put(members, inner_klass->java_mirror());
1299 members++;
1300 }
1301 }
1302 }
1303 }
1304
1305 if (members != length) {
1306 // Return array of right length
1307 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1308 for(int i = 0; i < members; i++) {
1309 res->obj_at_put(i, result->obj_at(i));
1310 }
1311 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1312 }
1313
1314 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1315 JVM_END
1316
1317
1318 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1319 {
1320 // ofClass is a reference to a java_lang_Class object.
1321 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1322 if (java_lang_Class::is_primitive(ofMirror)) {
1323 return nullptr;
1324 }
1325 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1326 if (!klass->is_instance_klass()) {
1327 return nullptr;
1328 }
1329
1330 bool inner_is_member = false;
1331 Klass* outer_klass
1332 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1333 if (outer_klass == nullptr) return nullptr; // already a top-level class
1334 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1335 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1336 }
1337 JVM_END
1338
1339 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1340 {
1341 oop mirror = JNIHandles::resolve_non_null(cls);
1342 if (java_lang_Class::is_primitive(mirror)) {
1343 return nullptr;
1344 }
1345 Klass* klass = java_lang_Class::as_Klass(mirror);
1346 if (!klass->is_instance_klass()) {
1347 return nullptr;
1348 }
1349 InstanceKlass* k = InstanceKlass::cast(klass);
1350 int ooff = 0, noff = 0;
1351 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1352 if (noff != 0) {
1353 constantPoolHandle i_cp(thread, k->constants());
1354 Symbol* name = i_cp->symbol_at(noff);
1355 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1356 return (jstring) JNIHandles::make_local(THREAD, str());
1357 }
1358 }
1359 return nullptr;
1360 }
1361 JVM_END
1362
1363 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1364 assert (cls != nullptr, "illegal class");
1365 JvmtiVMObjectAllocEventCollector oam;
1366 ResourceMark rm(THREAD);
1367 oop mirror = JNIHandles::resolve_non_null(cls);
1368 // Return null for arrays and primitives
1369 if (!java_lang_Class::is_primitive(mirror)) {
1370 Klass* k = java_lang_Class::as_Klass(mirror);
1371 if (k->is_instance_klass()) {
1372 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1373 if (sym == nullptr) return nullptr;
1374 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1375 return (jstring) JNIHandles::make_local(THREAD, str());
1376 }
1377 }
1378 return nullptr;
1379 JVM_END
1380
1381
1382 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1383 assert (cls != nullptr, "illegal class");
1384 oop mirror = JNIHandles::resolve_non_null(cls);
1385 // Return null for arrays and primitives
1386 if (!java_lang_Class::is_primitive(mirror)) {
1387 Klass* k = java_lang_Class::as_Klass(mirror);
1388 if (k->is_instance_klass()) {
1389 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1390 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1391 }
1392 }
1393 return nullptr;
1394 JVM_END
1395
1396
1397 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1398 // some of this code was adapted from from jni_FromReflectedField
1399
1400 oop reflected = JNIHandles::resolve_non_null(field);
1401 oop mirror = java_lang_reflect_Field::clazz(reflected);
1402 int slot = java_lang_reflect_Field::slot(reflected);
1403 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1404
1405 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1406 int offset = ik->field_offset(slot);
1407
1408 if (modifiers & JVM_ACC_STATIC) {
1409 // for static fields we only look in the current class
1410 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1411 assert(false, "cannot find static field");
1412 return false;
1413 }
1414 } else {
1415 // for instance fields we start with the current class and work
1416 // our way up through the superclass chain
1417 if (!ik->find_field_from_offset(offset, false, &fd)) {
1418 assert(false, "cannot find instance field");
1419 return false;
1420 }
1421 }
1422 return true;
1423 }
1424
1425 static Method* jvm_get_method_common(jobject method) {
1426 // some of this code was adapted from from jni_FromReflectedMethod
1427
1428 oop reflected = JNIHandles::resolve_non_null(method);
1429 oop mirror = nullptr;
1430 int slot = 0;
1431
1432 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1433 mirror = java_lang_reflect_Constructor::clazz(reflected);
1434 slot = java_lang_reflect_Constructor::slot(reflected);
1435 } else {
1436 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1437 "wrong type");
1438 mirror = java_lang_reflect_Method::clazz(reflected);
1439 slot = java_lang_reflect_Method::slot(reflected);
1440 }
1441 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1442
1443 Method* m = ik->method_with_idnum(slot);
1444 assert(m != nullptr, "cannot find method");
1445 return m; // caller has to deal with null in product mode
1446 }
1447
1448 /* Type use annotations support (JDK 1.8) */
1449
1450 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1451 assert (cls != nullptr, "illegal class");
1452 ResourceMark rm(THREAD);
1453 // Return null for arrays and primitives
1454 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1455 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1456 if (k->is_instance_klass()) {
1457 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1458 if (type_annotations != nullptr) {
1459 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1460 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1461 }
1462 }
1463 }
1464 return nullptr;
1465 JVM_END
1466
1467 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1468 assert (method != nullptr, "illegal method");
1469 // method is a handle to a java.lang.reflect.Method object
1470 Method* m = jvm_get_method_common(method);
1471 if (m == nullptr) {
1472 return nullptr;
1473 }
1474
1475 AnnotationArray* type_annotations = m->type_annotations();
1476 if (type_annotations != nullptr) {
1477 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1478 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1479 }
1480
1481 return nullptr;
1482 JVM_END
1483
1484 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1485 assert (field != nullptr, "illegal field");
1486 fieldDescriptor fd;
1487 bool gotFd = jvm_get_field_common(field, fd);
1488 if (!gotFd) {
1489 return nullptr;
1490 }
1491
1492 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1493 JVM_END
1494
1495 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1496 if (!cp->is_within_bounds(index)) {
1497 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1498 }
1499 }
1500
1501 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1502 {
1503 // method is a handle to a java.lang.reflect.Method object
1504 Method* method_ptr = jvm_get_method_common(method);
1505 methodHandle mh (THREAD, method_ptr);
1506 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1507 const int num_params = mh->method_parameters_length();
1508
1509 if (num_params < 0) {
1510 // A -1 return value from method_parameters_length means there is no
1511 // parameter data. Return null to indicate this to the reflection
1512 // API.
1513 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1514 return (jobjectArray)nullptr;
1515 } else {
1516 // Otherwise, we return something up to reflection, even if it is
1517 // a zero-length array. Why? Because in some cases this can
1518 // trigger a MalformedParametersException.
1519
1520 // make sure all the symbols are properly formatted
1521 for (int i = 0; i < num_params; i++) {
1522 MethodParametersElement* params = mh->method_parameters_start();
1523 int index = params[i].name_cp_index;
1524 constantPoolHandle cp(THREAD, mh->constants());
1525 bounds_check(cp, index, CHECK_NULL);
1526
1527 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1528 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1529 "Wrong type at constant pool index");
1530 }
1531
1532 }
1533
1534 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1535 objArrayHandle result (THREAD, result_oop);
1536
1537 for (int i = 0; i < num_params; i++) {
1538 MethodParametersElement* params = mh->method_parameters_start();
1539 // For a 0 index, give a null symbol
1540 Symbol* sym = 0 != params[i].name_cp_index ?
1541 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1542 int flags = params[i].flags;
1543 oop param = Reflection::new_parameter(reflected_method, i, sym,
1544 flags, CHECK_NULL);
1545 result->obj_at_put(i, param);
1546 }
1547 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1548 }
1549 }
1550 JVM_END
1551
1552 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1553
1554 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1555 {
1556 JvmtiVMObjectAllocEventCollector oam;
1557
1558 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1559 // Exclude primitive types and array types
1560 if (java_lang_Class::is_primitive(ofMirror) ||
1561 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1562 // Return empty array
1563 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1564 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1565 }
1566
1567 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1568 constantPoolHandle cp(THREAD, k->constants());
1569
1570 // Ensure class is linked
1571 k->link_class(CHECK_NULL);
1572
1573 // Allocate result
1574 int num_fields;
1575
1576 if (publicOnly) {
1577 num_fields = 0;
1578 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1579 if (fs.access_flags().is_public()) ++num_fields;
1580 }
1581 } else {
1582 num_fields = k->java_fields_count();
1583 }
1584
1585 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1586 objArrayHandle result (THREAD, r);
1587
1588 int out_idx = 0;
1589 fieldDescriptor fd;
1590 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1591 if (!publicOnly || fs.access_flags().is_public()) {
1592 fd.reinitialize(k, fs.to_FieldInfo());
1593 oop field = Reflection::new_field(&fd, CHECK_NULL);
1594 result->obj_at_put(out_idx, field);
1595 ++out_idx;
1596 }
1597 }
1598 assert(out_idx == num_fields, "just checking");
1599 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1600 }
1601 JVM_END
1602
1603 // A class is a record if and only if it is final and a direct subclass of
1604 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1605 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1606 {
1607 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1608 if (k != nullptr && k->is_instance_klass()) {
1609 InstanceKlass* ik = InstanceKlass::cast(k);
1610 return ik->is_record();
1611 } else {
1612 return false;
1613 }
1614 }
1615 JVM_END
1616
1617 // Returns an array containing the components of the Record attribute,
1618 // or null if the attribute is not present.
1619 //
1620 // Note that this function returns the components of the Record attribute
1621 // even if the class is not a record.
1622 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1623 {
1624 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1625
1626 Array<RecordComponent*>* components = ik->record_components();
1627 if (components != nullptr) {
1628 JvmtiVMObjectAllocEventCollector oam;
1629 constantPoolHandle cp(THREAD, ik->constants());
1630 int length = components->length();
1631 assert(length >= 0, "unexpected record_components length");
1632 objArrayOop record_components =
1633 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1634 objArrayHandle components_h (THREAD, record_components);
1635
1636 for (int x = 0; x < length; x++) {
1637 RecordComponent* component = components->at(x);
1638 assert(component != nullptr, "unexpected null record component");
1639 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1640 components_h->obj_at_put(x, component_oop);
1641 }
1642 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1643 }
1644
1645 return nullptr;
1646 }
1647 JVM_END
1648
1649 static jobjectArray get_class_declared_methods_helper(
1650 JNIEnv *env,
1651 jclass ofClass, jboolean publicOnly,
1652 bool want_constructor,
1653 Klass* klass, TRAPS) {
1654
1655 JvmtiVMObjectAllocEventCollector oam;
1656
1657 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1658 // Exclude primitive types and array types
1659 if (java_lang_Class::is_primitive(ofMirror)
1660 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1661 // Return empty array
1662 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1663 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1664 }
1665
1666 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1667
1668 // Ensure class is linked
1669 k->link_class(CHECK_NULL);
1670
1671 Array<Method*>* methods = k->methods();
1672 int methods_length = methods->length();
1673
1674 // Save original method_idnum in case of redefinition, which can change
1675 // the idnum of obsolete methods. The new method will have the same idnum
1676 // but if we refresh the methods array, the counts will be wrong.
1677 ResourceMark rm(THREAD);
1678 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1679 int num_methods = 0;
1680
1681 // Select methods matching the criteria.
1682 for (int i = 0; i < methods_length; i++) {
1683 Method* method = methods->at(i);
1684 if (want_constructor && !method->is_object_initializer()) {
1685 continue;
1686 }
1687 if (!want_constructor &&
1688 (method->is_object_initializer() || method->is_static_initializer() ||
1689 method->is_overpass())) {
1690 continue;
1691 }
1692 if (publicOnly && !method->is_public()) {
1693 continue;
1694 }
1695 idnums->push(method->method_idnum());
1696 ++num_methods;
1697 }
1698
1699 // Allocate result
1700 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1701 objArrayHandle result (THREAD, r);
1702
1703 // Now just put the methods that we selected above, but go by their idnum
1704 // in case of redefinition. The methods can be redefined at any safepoint,
1705 // so above when allocating the oop array and below when creating reflect
1706 // objects.
1707 for (int i = 0; i < num_methods; i++) {
1708 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1709 if (method.is_null()) {
1710 // Method may have been deleted and seems this API can handle null
1711 // Otherwise should probably put a method that throws NSME
1712 result->obj_at_put(i, nullptr);
1713 } else {
1714 oop m;
1715 if (want_constructor) {
1716 m = Reflection::new_constructor(method, CHECK_NULL);
1717 } else {
1718 m = Reflection::new_method(method, false, CHECK_NULL);
1719 }
1720 result->obj_at_put(i, m);
1721 }
1722 }
1723
1724 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1725 }
1726
1727 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1728 {
1729 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1730 /*want_constructor*/ false,
1731 vmClasses::reflect_Method_klass(), THREAD);
1732 }
1733 JVM_END
1734
1735 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1736 {
1737 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1738 /*want_constructor*/ true,
1739 vmClasses::reflect_Constructor_klass(), THREAD);
1740 }
1741 JVM_END
1742
1743 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1744 {
1745 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1746 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1747 return c->has_nestmate_access_to(m, THREAD);
1748 }
1749 JVM_END
1750
1751 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1752 {
1753 // current is not a primitive or array class
1754 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1755 InstanceKlass* host = c->nest_host(THREAD);
1756 return (jclass) (host == nullptr ? nullptr :
1757 JNIHandles::make_local(THREAD, host->java_mirror()));
1758 }
1759 JVM_END
1760
1761 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1762 {
1763 // current is not a primitive or array class
1764 ResourceMark rm(THREAD);
1765 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1766 InstanceKlass* host = c->nest_host(THREAD);
1767
1768 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1769 c->external_name(), host->external_name());
1770 {
1771 JvmtiVMObjectAllocEventCollector oam;
1772 Array<u2>* members = host->nest_members();
1773 int length = members == nullptr ? 0 : members->length();
1774
1775 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1776
1777 // nest host is first in the array so make it one bigger
1778 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1779 length + 1, CHECK_NULL);
1780 objArrayHandle result(THREAD, r);
1781 result->obj_at_put(0, host->java_mirror());
1782 if (length != 0) {
1783 int count = 0;
1784 for (int i = 0; i < length; i++) {
1785 int cp_index = members->at(i);
1786 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1787 if (HAS_PENDING_EXCEPTION) {
1788 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1789 return nullptr; // propagate VMEs
1790 }
1791 if (log_is_enabled(Trace, class, nestmates)) {
1792 stringStream ss;
1793 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1794 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1795 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1796 log_trace(class, nestmates)("%s", ss.as_string());
1797 }
1798 CLEAR_PENDING_EXCEPTION;
1799 continue;
1800 }
1801 if (k->is_instance_klass()) {
1802 InstanceKlass* ik = InstanceKlass::cast(k);
1803 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1804 if (nest_host_k == host) {
1805 result->obj_at_put(count+1, k->java_mirror());
1806 count++;
1807 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1808 } else {
1809 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1810 ik->external_name(), nest_host_k->external_name());
1811 }
1812 } else {
1813 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1814 k->external_name());
1815 }
1816 }
1817 if (count < length) {
1818 // we had invalid entries so we need to compact the array
1819 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1820 length + 1, count + 1);
1821
1822 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1823 count + 1, CHECK_NULL);
1824 objArrayHandle result2(THREAD, r2);
1825 for (int i = 0; i < count + 1; i++) {
1826 result2->obj_at_put(i, result->obj_at(i));
1827 }
1828 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1829 }
1830 }
1831 else {
1832 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1833 }
1834 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1835 }
1836 }
1837 JVM_END
1838
1839 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1840 {
1841 oop mirror = JNIHandles::resolve_non_null(current);
1842 assert(!java_lang_Class::is_primitive(mirror), "should not be");
1843 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1844
1845 ResourceMark rm(THREAD);
1846 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
1847 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
1848 if (ik->is_sealed()) {
1849 JvmtiVMObjectAllocEventCollector oam;
1850 Array<u2>* subclasses = ik->permitted_subclasses();
1851 int length = subclasses->length();
1852
1853 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
1854
1855 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1856 length, CHECK_NULL);
1857 objArrayHandle result(THREAD, r);
1858 int count = 0;
1859 for (int i = 0; i < length; i++) {
1860 int cp_index = subclasses->at(i);
1861 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
1862 if (HAS_PENDING_EXCEPTION) {
1863 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1864 return nullptr; // propagate VMEs
1865 }
1866 if (log_is_enabled(Trace, class, sealed)) {
1867 stringStream ss;
1868 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
1869 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
1870 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1871 log_trace(class, sealed)("%s", ss.as_string());
1872 }
1873
1874 CLEAR_PENDING_EXCEPTION;
1875 continue;
1876 }
1877 if (k->is_instance_klass()) {
1878 result->obj_at_put(count++, k->java_mirror());
1879 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
1880 }
1881 }
1882 if (count < length) {
1883 // we had invalid entries so we need to compact the array
1884 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1885 count, CHECK_NULL);
1886 objArrayHandle result2(THREAD, r2);
1887 for (int i = 0; i < count; i++) {
1888 result2->obj_at_put(i, result->obj_at(i));
1889 }
1890 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1891 }
1892 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1893 } else {
1894 return nullptr;
1895 }
1896 }
1897 JVM_END
1898
1899 // Constant pool access //////////////////////////////////////////////////////////
1900
1901 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1902 {
1903 JvmtiVMObjectAllocEventCollector oam;
1904 oop mirror = JNIHandles::resolve_non_null(cls);
1905 // Return null for primitives and arrays
1906 if (!java_lang_Class::is_primitive(mirror)) {
1907 Klass* k = java_lang_Class::as_Klass(mirror);
1908 if (k->is_instance_klass()) {
1909 InstanceKlass* k_h = InstanceKlass::cast(k);
1910 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1911 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1912 return JNIHandles::make_local(THREAD, jcp());
1913 }
1914 }
1915 return nullptr;
1916 }
1917 JVM_END
1918
1919
1920 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
1921 {
1922 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1923 return cp->length();
1924 }
1925 JVM_END
1926
1927
1928 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
1929 {
1930 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1931 bounds_check(cp, index, CHECK_NULL);
1932 constantTag tag = cp->tag_at(index);
1933 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1934 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1935 }
1936 Klass* k = cp->klass_at(index, CHECK_NULL);
1937 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1938 }
1939 JVM_END
1940
1941 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1942 {
1943 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1944 bounds_check(cp, index, CHECK_NULL);
1945 constantTag tag = cp->tag_at(index);
1946 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1947 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1948 }
1949 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1950 if (k == nullptr) return nullptr;
1951 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1952 }
1953 JVM_END
1954
1955 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1956 constantTag tag = cp->tag_at(index);
1957 if (!tag.is_method() && !tag.is_interface_method()) {
1958 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1959 }
1960 int klass_ref = cp->uncached_klass_ref_index_at(index);
1961 Klass* k_o;
1962 if (force_resolution) {
1963 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1964 } else {
1965 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1966 if (k_o == nullptr) return nullptr;
1967 }
1968 InstanceKlass* k = InstanceKlass::cast(k_o);
1969 Symbol* name = cp->uncached_name_ref_at(index);
1970 Symbol* sig = cp->uncached_signature_ref_at(index);
1971 methodHandle m (THREAD, k->find_method(name, sig));
1972 if (m.is_null()) {
1973 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1974 }
1975 oop method;
1976 if (m->is_object_initializer()) {
1977 method = Reflection::new_constructor(m, CHECK_NULL);
1978 } else {
1979 // new_method accepts <clinit> as Method here
1980 method = Reflection::new_method(m, true, CHECK_NULL);
1981 }
1982 return JNIHandles::make_local(THREAD, method);
1983 }
1984
1985 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
1986 {
1987 JvmtiVMObjectAllocEventCollector oam;
1988 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1989 bounds_check(cp, index, CHECK_NULL);
1990 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1991 return res;
1992 }
1993 JVM_END
1994
1995 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1996 {
1997 JvmtiVMObjectAllocEventCollector oam;
1998 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1999 bounds_check(cp, index, CHECK_NULL);
2000 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2001 return res;
2002 }
2003 JVM_END
2004
2005 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2006 constantTag tag = cp->tag_at(index);
2007 if (!tag.is_field()) {
2008 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2009 }
2010 int klass_ref = cp->uncached_klass_ref_index_at(index);
2011 Klass* k_o;
2012 if (force_resolution) {
2013 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2014 } else {
2015 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2016 if (k_o == nullptr) return nullptr;
2017 }
2018 InstanceKlass* k = InstanceKlass::cast(k_o);
2019 Symbol* name = cp->uncached_name_ref_at(index);
2020 Symbol* sig = cp->uncached_signature_ref_at(index);
2021 fieldDescriptor fd;
2022 Klass* target_klass = k->find_field(name, sig, &fd);
2023 if (target_klass == nullptr) {
2024 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2025 }
2026 oop field = Reflection::new_field(&fd, CHECK_NULL);
2027 return JNIHandles::make_local(THREAD, field);
2028 }
2029
2030 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2031 {
2032 JvmtiVMObjectAllocEventCollector oam;
2033 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2034 bounds_check(cp, index, CHECK_NULL);
2035 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2036 return res;
2037 }
2038 JVM_END
2039
2040 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2041 {
2042 JvmtiVMObjectAllocEventCollector oam;
2043 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2044 bounds_check(cp, index, CHECK_NULL);
2045 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2046 return res;
2047 }
2048 JVM_END
2049
2050 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2051 {
2052 JvmtiVMObjectAllocEventCollector oam;
2053 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2054 bounds_check(cp, index, CHECK_NULL);
2055 constantTag tag = cp->tag_at(index);
2056 if (!tag.is_field_or_method()) {
2057 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2058 }
2059 int klass_ref = cp->uncached_klass_ref_index_at(index);
2060 Symbol* klass_name = cp->klass_name_at(klass_ref);
2061 Symbol* member_name = cp->uncached_name_ref_at(index);
2062 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2063 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2064 objArrayHandle dest(THREAD, dest_o);
2065 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2066 dest->obj_at_put(0, str());
2067 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2068 dest->obj_at_put(1, str());
2069 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2070 dest->obj_at_put(2, str());
2071 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2072 }
2073 JVM_END
2074
2075 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2076 {
2077 JvmtiVMObjectAllocEventCollector oam;
2078 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2079 bounds_check(cp, index, CHECK_0);
2080 constantTag tag = cp->tag_at(index);
2081 if (!tag.is_field_or_method()) {
2082 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2083 }
2084 return (jint) cp->uncached_klass_ref_index_at(index);
2085 }
2086 JVM_END
2087
2088 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2089 {
2090 JvmtiVMObjectAllocEventCollector oam;
2091 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2092 bounds_check(cp, index, CHECK_0);
2093 constantTag tag = cp->tag_at(index);
2094 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2095 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2096 }
2097 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2098 }
2099 JVM_END
2100
2101 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2102 {
2103 JvmtiVMObjectAllocEventCollector oam;
2104 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2105 bounds_check(cp, index, CHECK_NULL);
2106 constantTag tag = cp->tag_at(index);
2107 if (!tag.is_name_and_type()) {
2108 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2109 }
2110 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2111 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2112 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2113 objArrayHandle dest(THREAD, dest_o);
2114 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2115 dest->obj_at_put(0, str());
2116 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2117 dest->obj_at_put(1, str());
2118 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2119 }
2120 JVM_END
2121
2122 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2123 {
2124 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2125 bounds_check(cp, index, CHECK_0);
2126 constantTag tag = cp->tag_at(index);
2127 if (!tag.is_int()) {
2128 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2129 }
2130 return cp->int_at(index);
2131 }
2132 JVM_END
2133
2134 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2135 {
2136 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2137 bounds_check(cp, index, CHECK_(0L));
2138 constantTag tag = cp->tag_at(index);
2139 if (!tag.is_long()) {
2140 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2141 }
2142 return cp->long_at(index);
2143 }
2144 JVM_END
2145
2146 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2147 {
2148 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2149 bounds_check(cp, index, CHECK_(0.0f));
2150 constantTag tag = cp->tag_at(index);
2151 if (!tag.is_float()) {
2152 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2153 }
2154 return cp->float_at(index);
2155 }
2156 JVM_END
2157
2158 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2159 {
2160 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2161 bounds_check(cp, index, CHECK_(0.0));
2162 constantTag tag = cp->tag_at(index);
2163 if (!tag.is_double()) {
2164 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2165 }
2166 return cp->double_at(index);
2167 }
2168 JVM_END
2169
2170 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2171 {
2172 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2173 bounds_check(cp, index, CHECK_NULL);
2174 constantTag tag = cp->tag_at(index);
2175 if (!tag.is_string()) {
2176 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2177 }
2178 oop str = cp->string_at(index, CHECK_NULL);
2179 return (jstring) JNIHandles::make_local(THREAD, str);
2180 }
2181 JVM_END
2182
2183 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2184 {
2185 JvmtiVMObjectAllocEventCollector oam;
2186 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2187 bounds_check(cp, index, CHECK_NULL);
2188 constantTag tag = cp->tag_at(index);
2189 if (!tag.is_symbol()) {
2190 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2191 }
2192 Symbol* sym = cp->symbol_at(index);
2193 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2194 return (jstring) JNIHandles::make_local(THREAD, str());
2195 }
2196 JVM_END
2197
2198 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2199 {
2200 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2201 bounds_check(cp, index, CHECK_0);
2202 constantTag tag = cp->tag_at(index);
2203 jbyte result = tag.value();
2204 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2205 // they are changed to the corresponding tags from the JVM spec, so that java code in
2206 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2207 if (tag.is_klass_or_reference()) {
2208 result = JVM_CONSTANT_Class;
2209 } else if (tag.is_string_index()) {
2210 result = JVM_CONSTANT_String;
2211 } else if (tag.is_method_type_in_error()) {
2212 result = JVM_CONSTANT_MethodType;
2213 } else if (tag.is_method_handle_in_error()) {
2214 result = JVM_CONSTANT_MethodHandle;
2215 } else if (tag.is_dynamic_constant_in_error()) {
2216 result = JVM_CONSTANT_Dynamic;
2217 }
2218 return result;
2219 }
2220 JVM_END
2221
2222 // Assertion support. //////////////////////////////////////////////////////////
2223
2224 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2225 assert(cls != nullptr, "bad class");
2226
2227 oop r = JNIHandles::resolve(cls);
2228 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2229 if (java_lang_Class::is_primitive(r)) return false;
2230
2231 Klass* k = java_lang_Class::as_Klass(r);
2232 assert(k->is_instance_klass(), "must be an instance klass");
2233 if (!k->is_instance_klass()) return false;
2234
2235 ResourceMark rm(THREAD);
2236 const char* name = k->name()->as_C_string();
2237 bool system_class = k->class_loader() == nullptr;
2238 return JavaAssertions::enabled(name, system_class);
2239
2240 JVM_END
2241
2242
2243 // Return a new AssertionStatusDirectives object with the fields filled in with
2244 // command-line assertion arguments (i.e., -ea, -da).
2245 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2246 JvmtiVMObjectAllocEventCollector oam;
2247 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2248 return JNIHandles::make_local(THREAD, asd);
2249 JVM_END
2250
2251 // Verification ////////////////////////////////////////////////////////////////////////////////
2252
2253 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2254
2255 // RedefineClasses support: bug 6214132 caused verification to fail.
2256 // All functions from this section, unless noted otherwise, should call the functions
2257 // get_klass_considering_redefinition(), or
2258 // get_instance_klass_considering_redefinition()
2259 // These functions return JvmtiThreadState::_scratch_class if the verifier
2260 // was invoked in the middle of the redefinition of cls.
2261 // See jvmtiThreadState.hpp for details.
2262
2263 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2264 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2265 if (k->is_instance_klass()) {
2266 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2267 } else {
2268 return k;
2269 }
2270 }
2271
2272 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2273 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2274 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2275 }
2276
2277 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2278 oop mirror = JNIHandles::resolve_non_null(cls);
2279 if (java_lang_Class::is_primitive(mirror)) {
2280 return JNI_FALSE;
2281 }
2282 Klass* k = java_lang_Class::as_Klass(mirror);
2283 // This isn't necessary since answer is the same because redefinition
2284 // has already checked this matches for the scratch class.
2285 // k = get_klass_considering_redefinition(cls, thread)
2286 jboolean result = k->is_interface();
2287 assert(!result || k->is_instance_klass(),
2288 "all interfaces are instance types");
2289 return result;
2290 JVM_END
2291
2292 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2293 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2294 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2295 return k->name()->as_utf8();
2296 JVM_END
2297
2298
2299 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2300 Klass* k = get_klass_considering_redefinition(cls, thread);
2301 // types will have length zero if this is not an InstanceKlass
2302 // (length is determined by call to JVM_GetClassCPEntriesCount)
2303 if (k->is_instance_klass()) {
2304 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2305 for (int index = cp->length() - 1; index >= 0; index--) {
2306 constantTag tag = cp->tag_at(index);
2307 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2308 }
2309 }
2310 JVM_END
2311
2312
2313 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2314 Klass* k = get_klass_considering_redefinition(cls, thread);
2315 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2316 JVM_END
2317
2318
2319 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2320 Klass* k = get_klass_considering_redefinition(cls, thread);
2321 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2322 JVM_END
2323
2324
2325 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2326 Klass* k = get_klass_considering_redefinition(cls, thread);
2327 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2328 JVM_END
2329
2330
2331 // The following methods, used for the verifier, are never called with
2332 // array klasses, so a direct cast to InstanceKlass is safe.
2333 // Typically, these methods are called in a loop with bounds determined
2334 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2335 // zero for arrays.
2336 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2337 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2338 Method* method = ik->methods()->at(method_index);
2339 int length = method->checked_exceptions_length();
2340 if (length > 0) {
2341 CheckedExceptionElement* table= method->checked_exceptions_start();
2342 for (int i = 0; i < length; i++) {
2343 exceptions[i] = table[i].class_cp_index;
2344 }
2345 }
2346 JVM_END
2347
2348
2349 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2350 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2351 Method* method = ik->methods()->at(method_index);
2352 return method->checked_exceptions_length();
2353 JVM_END
2354
2355
2356 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2357 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2358 Method* method = ik->methods()->at(method_index);
2359 memcpy(code, method->code_base(), method->code_size());
2360 JVM_END
2361
2362
2363 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2364 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2365 Method* method = ik->methods()->at(method_index);
2366 return method->code_size();
2367 JVM_END
2368
2369
2370 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2371 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2372 Method* method = ik->methods()->at(method_index);
2373 ExceptionTable extable(method);
2374 entry->start_pc = extable.start_pc(entry_index);
2375 entry->end_pc = extable.end_pc(entry_index);
2376 entry->handler_pc = extable.handler_pc(entry_index);
2377 entry->catchType = extable.catch_type_index(entry_index);
2378 JVM_END
2379
2380
2381 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2382 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2383 Method* method = ik->methods()->at(method_index);
2384 return method->exception_table_length();
2385 JVM_END
2386
2387
2388 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2389 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2390 Method* method = ik->methods()->at(method_index);
2391 return method->access_flags().as_method_flags();
2392 JVM_END
2393
2394
2395 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2396 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2397 return ik->field_access_flags(field_index);
2398 JVM_END
2399
2400
2401 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2402 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2403 Method* method = ik->methods()->at(method_index);
2404 return method->max_locals();
2405 JVM_END
2406
2407
2408 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2409 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2410 Method* method = ik->methods()->at(method_index);
2411 return method->size_of_parameters();
2412 JVM_END
2413
2414
2415 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2416 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2417 Method* method = ik->methods()->at(method_index);
2418 return method->verifier_max_stack();
2419 JVM_END
2420
2421
2422 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2423 ResourceMark rm(THREAD);
2424 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2425 Method* method = ik->methods()->at(method_index);
2426 return method->name() == vmSymbols::object_initializer_name();
2427 JVM_END
2428
2429
2430 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2431 ResourceMark rm(THREAD);
2432 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2433 Method* method = ik->methods()->at(method_index);
2434 return method->is_overpass();
2435 JVM_END
2436
2437 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2438 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2439 Method* method = ik->methods()->at(method_index);
2440 return method->name()->as_utf8();
2441 JVM_END
2442
2443
2444 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2445 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2446 Method* method = ik->methods()->at(method_index);
2447 return method->signature()->as_utf8();
2448 JVM_END
2449
2450 /**
2451 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2452 * read entries in the constant pool. Since the old verifier always
2453 * works on a copy of the code, it will not see any rewriting that
2454 * may possibly occur in the middle of verification. So it is important
2455 * that nothing it calls tries to use the cpCache instead of the raw
2456 * constant pool, so we must use cp->uncached_x methods when appropriate.
2457 */
2458 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2459 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2460 ConstantPool* cp = ik->constants();
2461 switch (cp->tag_at(cp_index).value()) {
2462 case JVM_CONSTANT_Fieldref:
2463 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2464 default:
2465 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2466 }
2467 ShouldNotReachHere();
2468 return nullptr;
2469 JVM_END
2470
2471
2472 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2473 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2474 ConstantPool* cp = ik->constants();
2475 switch (cp->tag_at(cp_index).value()) {
2476 case JVM_CONSTANT_InterfaceMethodref:
2477 case JVM_CONSTANT_Methodref:
2478 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2479 default:
2480 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2481 }
2482 ShouldNotReachHere();
2483 return nullptr;
2484 JVM_END
2485
2486
2487 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2488 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2489 ConstantPool* cp = ik->constants();
2490 switch (cp->tag_at(cp_index).value()) {
2491 case JVM_CONSTANT_InterfaceMethodref:
2492 case JVM_CONSTANT_Methodref:
2493 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2494 default:
2495 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2496 }
2497 ShouldNotReachHere();
2498 return nullptr;
2499 JVM_END
2500
2501
2502 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2503 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2504 ConstantPool* cp = ik->constants();
2505 switch (cp->tag_at(cp_index).value()) {
2506 case JVM_CONSTANT_Fieldref:
2507 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2508 default:
2509 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2510 }
2511 ShouldNotReachHere();
2512 return nullptr;
2513 JVM_END
2514
2515
2516 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2517 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2518 ConstantPool* cp = ik->constants();
2519 Symbol* classname = cp->klass_name_at(cp_index);
2520 return classname->as_utf8();
2521 JVM_END
2522
2523
2524 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2525 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2526 ConstantPool* cp = ik->constants();
2527 switch (cp->tag_at(cp_index).value()) {
2528 case JVM_CONSTANT_Fieldref: {
2529 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2530 Symbol* classname = cp->klass_name_at(class_index);
2531 return classname->as_utf8();
2532 }
2533 default:
2534 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2535 }
2536 ShouldNotReachHere();
2537 return nullptr;
2538 JVM_END
2539
2540
2541 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2542 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2543 ConstantPool* cp = ik->constants();
2544 switch (cp->tag_at(cp_index).value()) {
2545 case JVM_CONSTANT_Methodref:
2546 case JVM_CONSTANT_InterfaceMethodref: {
2547 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2548 Symbol* classname = cp->klass_name_at(class_index);
2549 return classname->as_utf8();
2550 }
2551 default:
2552 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2553 }
2554 ShouldNotReachHere();
2555 return nullptr;
2556 JVM_END
2557
2558
2559 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2560 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2561 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2562 ConstantPool* cp = ik->constants();
2563 ConstantPool* cp_called = ik_called->constants();
2564 switch (cp->tag_at(cp_index).value()) {
2565 case JVM_CONSTANT_Fieldref: {
2566 Symbol* name = cp->uncached_name_ref_at(cp_index);
2567 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2568 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2569 if (fs.name() == name && fs.signature() == signature) {
2570 return fs.access_flags().as_field_flags();
2571 }
2572 }
2573 return -1;
2574 }
2575 default:
2576 fatal("JVM_GetCPFieldModifiers: illegal constant");
2577 }
2578 ShouldNotReachHere();
2579 return 0;
2580 JVM_END
2581
2582
2583 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2584 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2585 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2586 ConstantPool* cp = ik->constants();
2587 switch (cp->tag_at(cp_index).value()) {
2588 case JVM_CONSTANT_Methodref:
2589 case JVM_CONSTANT_InterfaceMethodref: {
2590 Symbol* name = cp->uncached_name_ref_at(cp_index);
2591 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2592 Array<Method*>* methods = ik_called->methods();
2593 int methods_count = methods->length();
2594 for (int i = 0; i < methods_count; i++) {
2595 Method* method = methods->at(i);
2596 if (method->name() == name && method->signature() == signature) {
2597 return method->access_flags().as_method_flags();
2598 }
2599 }
2600 return -1;
2601 }
2602 default:
2603 fatal("JVM_GetCPMethodModifiers: illegal constant");
2604 }
2605 ShouldNotReachHere();
2606 return 0;
2607 JVM_END
2608
2609
2610 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2611
2612 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2613 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2614 JVM_END
2615
2616
2617 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2618 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2619 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2620 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2621 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2622 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2623 JVM_END
2624
2625 // Printing support //////////////////////////////////////////////////
2626 extern "C" {
2627
2628 ATTRIBUTE_PRINTF(3, 0)
2629 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2630 // Reject count values that are negative signed values converted to
2631 // unsigned; see bug 4399518, 4417214
2632 if ((intptr_t)count <= 0) return -1;
2633
2634 int result = os::vsnprintf(str, count, fmt, args);
2635 if (result > 0 && (size_t)result >= count) {
2636 result = -1;
2637 }
2638
2639 return result;
2640 }
2641
2642 ATTRIBUTE_PRINTF(3, 4)
2643 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2644 va_list args;
2645 int len;
2646 va_start(args, fmt);
2647 len = jio_vsnprintf(str, count, fmt, args);
2648 va_end(args);
2649 return len;
2650 }
2651
2652 ATTRIBUTE_PRINTF(2, 3)
2653 int jio_fprintf(FILE* f, const char *fmt, ...) {
2654 int len;
2655 va_list args;
2656 va_start(args, fmt);
2657 len = jio_vfprintf(f, fmt, args);
2658 va_end(args);
2659 return len;
2660 }
2661
2662 ATTRIBUTE_PRINTF(2, 0)
2663 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2664 if (Arguments::vfprintf_hook() != nullptr) {
2665 return Arguments::vfprintf_hook()(f, fmt, args);
2666 } else {
2667 return vfprintf(f, fmt, args);
2668 }
2669 }
2670
2671 ATTRIBUTE_PRINTF(1, 2)
2672 JNIEXPORT int jio_printf(const char *fmt, ...) {
2673 int len;
2674 va_list args;
2675 va_start(args, fmt);
2676 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2677 va_end(args);
2678 return len;
2679 }
2680
2681 // HotSpot specific jio method
2682 void jio_print(const char* s, size_t len) {
2683 // Try to make this function as atomic as possible.
2684 if (Arguments::vfprintf_hook() != nullptr) {
2685 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2686 } else {
2687 // Make an unused local variable to avoid warning from gcc compiler.
2688 bool dummy = os::write(defaultStream::output_fd(), s, len);
2689 }
2690 }
2691
2692 } // Extern C
2693
2694 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2695
2696 // In most of the JVM thread support functions we need to access the
2697 // thread through a ThreadsListHandle to prevent it from exiting and
2698 // being reclaimed while we try to operate on it. The exceptions to this
2699 // rule are when operating on the current thread, or if the monitor of
2700 // the target java.lang.Thread is locked at the Java level - in both
2701 // cases the target cannot exit.
2702
2703 static void thread_entry(JavaThread* thread, TRAPS) {
2704 HandleMark hm(THREAD);
2705 Handle obj(THREAD, thread->threadObj());
2706 JavaValue result(T_VOID);
2707 JavaCalls::call_virtual(&result,
2708 obj,
2709 vmClasses::Thread_klass(),
2710 vmSymbols::run_method_name(),
2711 vmSymbols::void_method_signature(),
2712 THREAD);
2713 }
2714
2715
2716 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2717 #if INCLUDE_CDS
2718 if (CDSConfig::allow_only_single_java_thread()) {
2719 // During java -Xshare:dump, if we allow multiple Java threads to
2720 // execute in parallel, symbols and classes may be loaded in
2721 // random orders which will make the resulting CDS archive
2722 // non-deterministic.
2723 //
2724 // Lucikly, during java -Xshare:dump, it's important to run only
2725 // the code in the main Java thread (which is NOT started here) that
2726 // creates the module graph, etc. It's safe to not start the other
2727 // threads which are launched by class static initializers
2728 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2729 if (log_is_enabled(Info, aot)) {
2730 ResourceMark rm;
2731 oop t = JNIHandles::resolve_non_null(jthread);
2732 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2733 }
2734 return;
2735 }
2736 #endif
2737 JavaThread *native_thread = nullptr;
2738
2739 // We cannot hold the Threads_lock when we throw an exception,
2740 // due to rank ordering issues. Example: we might need to grab the
2741 // Heap_lock while we construct the exception.
2742 bool throw_illegal_thread_state = false;
2743
2744 // We must release the Threads_lock before we can post a jvmti event
2745 // in Thread::start.
2746 {
2747 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2748 // Ensure that the C++ Thread and OSThread structures aren't freed before
2749 // we operate.
2750 MutexLocker ml(Threads_lock);
2751
2752 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2753 // re-starting an already started thread, so we should usually find
2754 // that the JavaThread is null. However for a JNI attached thread
2755 // there is a small window between the Thread object being created
2756 // (with its JavaThread set) and the update to its threadStatus, so we
2757 // have to check for this
2758 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2759 throw_illegal_thread_state = true;
2760 } else {
2761 jlong size =
2762 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2763 // Allocate the C++ Thread structure and create the native thread. The
2764 // stack size retrieved from java is 64-bit signed, but the constructor takes
2765 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2766 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2767 // - Avoid passing negative values which would result in really large stacks.
2768 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2769 size_t sz = size > 0 ? (size_t) size : 0;
2770 native_thread = new JavaThread(&thread_entry, sz);
2771
2772 // At this point it may be possible that no osthread was created for the
2773 // JavaThread due to lack of memory. Check for this situation and throw
2774 // an exception if necessary. Eventually we may want to change this so
2775 // that we only grab the lock if the thread was created successfully -
2776 // then we can also do this check and throw the exception in the
2777 // JavaThread constructor.
2778 if (native_thread->osthread() != nullptr) {
2779 // Note: the current thread is not being used within "prepare".
2780 native_thread->prepare(jthread);
2781 }
2782 }
2783 }
2784
2785 if (throw_illegal_thread_state) {
2786 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2787 }
2788
2789 assert(native_thread != nullptr, "Starting null thread?");
2790
2791 if (native_thread->osthread() == nullptr) {
2792 ResourceMark rm(thread);
2793 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2794 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2795 // No one should hold a reference to the 'native_thread'.
2796 native_thread->smr_delete();
2797 if (JvmtiExport::should_post_resource_exhausted()) {
2798 JvmtiExport::post_resource_exhausted(
2799 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2800 os::native_thread_creation_failed_msg());
2801 }
2802 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2803 os::native_thread_creation_failed_msg());
2804 }
2805
2806 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2807
2808 Thread::start(native_thread);
2809
2810 JVM_END
2811
2812
2813 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2814 ThreadsListHandle tlh(thread);
2815 oop java_thread = nullptr;
2816 JavaThread* receiver = nullptr;
2817 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2818 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2819
2820 if (is_alive) {
2821 // jthread refers to a live JavaThread.
2822 Thread::set_priority(receiver, (ThreadPriority)prio);
2823 }
2824 // Implied else: If the JavaThread hasn't started yet, then the
2825 // priority set in the java.lang.Thread object above will be pushed
2826 // down when it does start.
2827 JVM_END
2828
2829
2830 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2831 HOTSPOT_THREAD_YIELD();
2832 os::naked_yield();
2833 JVM_END
2834
2835 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2836 if (nanos < 0) {
2837 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2838 }
2839
2840 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2841 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2842 }
2843
2844 // Save current thread state and restore it at the end of this block.
2845 // And set new thread state to SLEEPING.
2846 JavaThreadSleepState jtss(thread);
2847
2848 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
2849
2850 if (nanos == 0) {
2851 os::naked_yield();
2852 } else {
2853 ThreadState old_state = thread->osthread()->get_state();
2854 thread->osthread()->set_state(SLEEPING);
2855 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
2856 // An asynchronous exception could have been thrown on
2857 // us while we were sleeping. We do not overwrite those.
2858 if (!HAS_PENDING_EXCEPTION) {
2859 HOTSPOT_THREAD_SLEEP_END(1);
2860 if (!thread->has_async_exception_condition()) {
2861 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2862 // to properly restore the thread state. That's likely wrong.
2863 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2864 }
2865 }
2866 }
2867 thread->osthread()->set_state(old_state);
2868 }
2869 HOTSPOT_THREAD_SLEEP_END(0);
2870 JVM_END
2871
2872 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
2873 oop jthread = thread->threadObj();
2874 assert(jthread != nullptr, "no current carrier thread!");
2875 return JNIHandles::make_local(THREAD, jthread);
2876 JVM_END
2877
2878 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2879 oop theThread = thread->vthread();
2880 assert(theThread != (oop)nullptr, "no current thread!");
2881 return JNIHandles::make_local(THREAD, theThread);
2882 JVM_END
2883
2884 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
2885 jobject theThread))
2886 oop threadObj = JNIHandles::resolve(theThread);
2887 thread->set_vthread(threadObj);
2888
2889 // Set _monitor_owner_id of new current Thread
2890 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
2891
2892 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
2893 JVM_END
2894
2895 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
2896 return ThreadIdentifier::unsafe_offset();
2897 JVM_END
2898
2899 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2900 ThreadsListHandle tlh(thread);
2901 JavaThread* receiver = nullptr;
2902 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
2903 if (is_alive) {
2904 // jthread refers to a live JavaThread.
2905 receiver->interrupt();
2906 }
2907 JVM_END
2908
2909 // Return true iff the current thread has locked the object passed in
2910
2911 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
2912 if (obj == nullptr) {
2913 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
2914 }
2915 Handle h_obj(THREAD, JNIHandles::resolve(obj));
2916 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
2917 JVM_END
2918
2919 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
2920 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
2921 return JNIHandles::make_local(THREAD, trace);
2922 JVM_END
2923
2924 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
2925 #if INCLUDE_JVMTI
2926 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
2927 return JNIHandles::make_local(THREAD, snapshot);
2928 #else
2929 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
2930 #endif
2931 JVM_END
2932
2933 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
2934 // We don't use a ThreadsListHandle here because the current thread
2935 // must be alive.
2936 oop java_thread = JNIHandles::resolve_non_null(jthread);
2937 JavaThread* thr = java_lang_Thread::thread(java_thread);
2938 if (thread == thr && !thr->has_attached_via_jni()) {
2939 // Thread naming is only supported for the current thread and
2940 // we don't set the name of an attached thread to avoid stepping
2941 // on other programs.
2942 ResourceMark rm(thread);
2943 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2944 os::set_native_thread_name(thread_name);
2945 }
2946 JVM_END
2947
2948 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
2949 oop theCache = thread->scopedValueCache();
2950 return JNIHandles::make_local(THREAD, theCache);
2951 JVM_END
2952
2953 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
2954 jobject theCache))
2955 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
2956 thread->set_scopedValueCache(objs);
2957 JVM_END
2958
2959
2960 // java.lang.Package ////////////////////////////////////////////////////////////////
2961
2962
2963 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
2964 ResourceMark rm(THREAD);
2965 JvmtiVMObjectAllocEventCollector oam;
2966 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2967 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
2968 return (jstring) JNIHandles::make_local(THREAD, result);
2969 JVM_END
2970
2971
2972 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
2973 JvmtiVMObjectAllocEventCollector oam;
2974 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
2975 return (jobjectArray) JNIHandles::make_local(THREAD, result);
2976 JVM_END
2977
2978
2979 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
2980
2981
2982 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
2983 MonitorLocker ml(Heap_lock);
2984 oop ref = Universe::reference_pending_list();
2985 if (ref != nullptr) {
2986 Universe::clear_reference_pending_list();
2987 }
2988 return JNIHandles::make_local(THREAD, ref);
2989 JVM_END
2990
2991 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
2992 MonitorLocker ml(Heap_lock);
2993 return Universe::has_reference_pending_list();
2994 JVM_END
2995
2996 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
2997 MonitorLocker ml(Heap_lock);
2998 while (!Universe::has_reference_pending_list()) {
2999 ml.wait();
3000 }
3001 JVM_END
3002
3003 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3004 oop ref_oop = JNIHandles::resolve_non_null(ref);
3005 // PhantomReference has its own implementation of get().
3006 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3007 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3008 return JNIHandles::make_local(THREAD, referent);
3009 JVM_END
3010
3011 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3012 oop ref_oop = JNIHandles::resolve_non_null(ref);
3013 // PhantomReference has its own implementation of refersTo().
3014 // See: JVM_PhantomReferenceRefersTo
3015 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3016 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3017 return referent == JNIHandles::resolve(o);
3018 JVM_END
3019
3020 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3021 oop ref_oop = JNIHandles::resolve_non_null(ref);
3022 // FinalReference has it's own implementation of clear().
3023 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3024 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3025 // If the referent has already been cleared then done.
3026 // However, if the referent is dead but has not yet been cleared by
3027 // concurrent reference processing, it should NOT be cleared here.
3028 // Instead, clearing should be left to the GC. Clearing it here could
3029 // detectably lose an expected notification, which is impossible with
3030 // STW reference processing. The clearing in enqueue() doesn't have
3031 // this problem, since the enqueue covers the notification, but it's not
3032 // worth the effort to handle that case specially.
3033 return;
3034 }
3035 java_lang_ref_Reference::clear_referent(ref_oop);
3036 JVM_END
3037
3038
3039 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3040
3041
3042 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3043 oop ref_oop = JNIHandles::resolve_non_null(ref);
3044 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3045 return referent == JNIHandles::resolve(o);
3046 JVM_END
3047
3048
3049 // ObjectInputStream ///////////////////////////////////////////////////////////////
3050
3051 // Return the first user-defined class loader up the execution stack, or null
3052 // if only code from the bootstrap or platform class loader is on the stack.
3053
3054 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3055 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3056 InstanceKlass* ik = vfst.method()->method_holder();
3057 oop loader = ik->class_loader();
3058 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3059 return JNIHandles::make_local(THREAD, loader);
3060 }
3061 }
3062 return nullptr;
3063 JVM_END
3064
3065
3066 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3067
3068
3069 // resolve array handle and check arguments
3070 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3071 if (arr == nullptr) {
3072 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3073 }
3074 oop a = JNIHandles::resolve_non_null(arr);
3075 if (!a->is_array()) {
3076 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3077 } else if (type_array_only && !a->is_typeArray()) {
3078 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3079 }
3080 return arrayOop(a);
3081 }
3082
3083
3084 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3085 arrayOop a = check_array(env, arr, false, CHECK_0);
3086 return a->length();
3087 JVM_END
3088
3089
3090 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3091 JvmtiVMObjectAllocEventCollector oam;
3092 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3093 jvalue value;
3094 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3095 oop box = Reflection::box(&value, type, CHECK_NULL);
3096 return JNIHandles::make_local(THREAD, box);
3097 JVM_END
3098
3099
3100 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3101 jvalue value;
3102 value.i = 0; // to initialize value before getting used in CHECK
3103 arrayOop a = check_array(env, arr, true, CHECK_(value));
3104 assert(a->is_typeArray(), "just checking");
3105 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3106 BasicType wide_type = (BasicType) wCode;
3107 if (type != wide_type) {
3108 Reflection::widen(&value, type, wide_type, CHECK_(value));
3109 }
3110 return value;
3111 JVM_END
3112
3113
3114 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3115 arrayOop a = check_array(env, arr, false, CHECK);
3116 oop box = JNIHandles::resolve(val);
3117 jvalue value;
3118 value.i = 0; // to initialize value before getting used in CHECK
3119 BasicType value_type;
3120 if (a->is_objArray()) {
3121 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3122 value_type = Reflection::unbox_for_regular_object(box, &value);
3123 } else {
3124 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3125 }
3126 Reflection::array_set(&value, a, index, value_type, CHECK);
3127 JVM_END
3128
3129
3130 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3131 arrayOop a = check_array(env, arr, true, CHECK);
3132 assert(a->is_typeArray(), "just checking");
3133 BasicType value_type = (BasicType) vCode;
3134 Reflection::array_set(&v, a, index, value_type, CHECK);
3135 JVM_END
3136
3137
3138 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3139 JvmtiVMObjectAllocEventCollector oam;
3140 oop element_mirror = JNIHandles::resolve(eltClass);
3141 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3142 return JNIHandles::make_local(THREAD, result);
3143 JVM_END
3144
3145
3146 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3147 JvmtiVMObjectAllocEventCollector oam;
3148 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3149 oop element_mirror = JNIHandles::resolve(eltClass);
3150 assert(dim_array->is_typeArray(), "just checking");
3151 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3152 return JNIHandles::make_local(THREAD, result);
3153 JVM_END
3154
3155
3156 // Library support ///////////////////////////////////////////////////////////////////////////
3157
3158 JVM_LEAF(void*, JVM_LoadZipLibrary())
3159 return ZipLibrary::handle();
3160 JVM_END
3161
3162 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3163 //%note jvm_ct
3164 char ebuf[1024];
3165 void *load_result;
3166 {
3167 ThreadToNativeFromVM ttnfvm(thread);
3168 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3169 }
3170 if (load_result == nullptr) {
3171 if (throwException) {
3172 char msg[1024];
3173 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3174 // Since 'ebuf' may contain a string encoded using
3175 // platform encoding scheme, we need to pass
3176 // Exceptions::unsafe_to_utf8 to the new_exception method
3177 // as the last argument. See bug 6367357.
3178 Handle h_exception =
3179 Exceptions::new_exception(thread,
3180 vmSymbols::java_lang_UnsatisfiedLinkError(),
3181 msg, Exceptions::unsafe_to_utf8);
3182
3183 THROW_HANDLE_NULL(h_exception);
3184 } else {
3185 log_info(library)("Failed to load library %s", name);
3186 return load_result;
3187 }
3188 }
3189 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3190 return load_result;
3191 JVM_END
3192
3193
3194 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3195 os::dll_unload(handle);
3196 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3197 JVM_END
3198
3199
3200 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3201 void* find_result = os::dll_lookup(handle, name);
3202 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3203 find_result != nullptr ? "Found" : "Failed to find",
3204 name, p2i(handle));
3205 return find_result;
3206 JVM_END
3207
3208
3209 // JNI version ///////////////////////////////////////////////////////////////////////////////
3210
3211 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3212 return Threads::is_supported_jni_version_including_1_1(version);
3213 JVM_END
3214
3215
3216 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3217 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3218 JVM_END
3219
3220 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3221 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3222 JVM_END
3223
3224 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3225 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3226 JVM_END
3227
3228 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3229 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3230 JVM_END
3231
3232 // String support ///////////////////////////////////////////////////////////////////////////
3233
3234 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3235 JvmtiVMObjectAllocEventCollector oam;
3236 if (str == nullptr) return nullptr;
3237 oop string = JNIHandles::resolve_non_null(str);
3238 oop result = StringTable::intern(string, CHECK_NULL);
3239 return (jstring) JNIHandles::make_local(THREAD, result);
3240 JVM_END
3241
3242
3243 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3244
3245 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3246 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3247 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3248 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3249 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3250 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3251
3252
3253 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3254 VM_Exit::block_if_vm_exited();
3255 return new PlatformMutex();
3256 }
3257
3258
3259 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3260 VM_Exit::block_if_vm_exited();
3261 delete ((PlatformMutex*) mon);
3262 }
3263
3264
3265 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3266 VM_Exit::block_if_vm_exited();
3267 ((PlatformMutex*) mon)->lock();
3268 return 0;
3269 }
3270
3271
3272 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3273 VM_Exit::block_if_vm_exited();
3274 ((PlatformMutex*) mon)->unlock();
3275 }
3276
3277
3278 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3279
3280 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3281 Handle loader, jboolean throwError, TRAPS) {
3282 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3283
3284 // Check if we should initialize the class
3285 if (init && klass->is_instance_klass()) {
3286 klass->initialize(CHECK_NULL);
3287 }
3288 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3289 }
3290
3291
3292 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3293
3294 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3295 Handle method_handle;
3296 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3297 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3298 Handle receiver(THREAD, JNIHandles::resolve(obj));
3299 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3300 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3301 jobject res = JNIHandles::make_local(THREAD, result);
3302 if (JvmtiExport::should_post_vm_object_alloc()) {
3303 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3304 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3305 if (java_lang_Class::is_primitive(ret_type)) {
3306 // Only for primitive type vm allocates memory for java object.
3307 // See box() method.
3308 JvmtiExport::post_vm_object_alloc(thread, result);
3309 }
3310 }
3311 return res;
3312 } else {
3313 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3314 }
3315 JVM_END
3316
3317
3318 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3319 oop constructor_mirror = JNIHandles::resolve(c);
3320 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3321 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3322 jobject res = JNIHandles::make_local(THREAD, result);
3323 if (JvmtiExport::should_post_vm_object_alloc()) {
3324 JvmtiExport::post_vm_object_alloc(thread, result);
3325 }
3326 return res;
3327 JVM_END
3328
3329 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3330 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3331 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3332 JVM_END
3333
3334 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3335 jclass caller,
3336 jstring interfaceMethodName,
3337 jobject factoryType,
3338 jobject interfaceMethodType,
3339 jobject implementationMember,
3340 jobject dynamicMethodType,
3341 jclass lambdaProxyClass))
3342 #if INCLUDE_CDS
3343 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3344 return;
3345 }
3346
3347 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3348 if (caller_ik->is_hidden()) {
3349 // Hidden classes not of type lambda proxy classes are currently not being archived.
3350 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3351 // registered for archiving.
3352 return;
3353 }
3354 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3355 assert(lambda_ik->is_hidden(), "must be a hidden class");
3356 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3357
3358 Symbol* interface_method_name = nullptr;
3359 if (interfaceMethodName != nullptr) {
3360 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3361 }
3362 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3363 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3364
3365 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3366 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3367
3368 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3369 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3370 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3371
3372 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3373 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3374
3375 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3376 interface_method_type, m, dynamic_method_type, THREAD);
3377 #endif // INCLUDE_CDS
3378 JVM_END
3379
3380 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3381 jclass caller,
3382 jstring interfaceMethodName,
3383 jobject factoryType,
3384 jobject interfaceMethodType,
3385 jobject implementationMember,
3386 jobject dynamicMethodType))
3387 #if INCLUDE_CDS
3388
3389 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3390 implementationMember == nullptr || dynamicMethodType == nullptr) {
3391 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3392 }
3393
3394 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3395 if (!caller_ik->in_aot_cache()) {
3396 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3397 return nullptr;
3398 }
3399
3400 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3401 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3402 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3403
3404 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3405 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3406
3407 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3408 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3409 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3410
3411 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3412 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3413
3414 InstanceKlass* loaded_lambda =
3415 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3416 interface_method_type, m, dynamic_method_type,
3417 CHECK_(nullptr));
3418 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3419 #else
3420 return nullptr;
3421 #endif // INCLUDE_CDS
3422 JVM_END
3423
3424 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3425 if (CDSConfig::is_dumping_static_archive()) {
3426 // We do this so that the default CDS archive can be deterministic.
3427 const char* release = VM_Version::vm_release();
3428 const char* dbg_level = VM_Version::jdk_debug_level();
3429 const char* version = VM_Version::internal_vm_info_string();
3430 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3431 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3432 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3433 seed += (jlong)VM_Version::vm_major_version();
3434 seed += (jlong)VM_Version::vm_minor_version();
3435 seed += (jlong)VM_Version::vm_security_version();
3436 seed += (jlong)VM_Version::vm_patch_version();
3437 if (seed == 0) { // don't let this ever be zero.
3438 seed = 0x87654321;
3439 }
3440 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3441 return seed;
3442 } else {
3443 return 0;
3444 }
3445 JVM_END
3446
3447 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3448 return CDSConfig::get_status();
3449 JVM_END
3450
3451 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3452 #if INCLUDE_CDS
3453 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3454 if (line != nullptr) {
3455 ResourceMark rm(THREAD);
3456 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3457 char* c_line = java_lang_String::as_utf8_string(h_line());
3458 if (CDSConfig::is_dumping_dynamic_archive()) {
3459 // Note: LambdaFormInvokers::append take same format which is not
3460 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3461 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3462 }
3463 if (ClassListWriter::is_enabled()) {
3464 ClassListWriter w;
3465 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3466 }
3467 }
3468 #endif // INCLUDE_CDS
3469 JVM_END
3470
3471 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3472 #if INCLUDE_CDS
3473 ResourceMark rm(THREAD);
3474 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3475 char* file_name = java_lang_String::as_utf8_string(file_handle());
3476 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3477 #endif // INCLUDE_CDS
3478 JVM_END
3479
3480 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3481 #if INCLUDE_CDS
3482 ResourceMark rm(THREAD);
3483 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3484 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3485 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3486 #endif // INCLUDE_CDS
3487 JVM_END
3488
3489 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3490 #if INCLUDE_CDS
3491 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3492 if (!k->is_instance_klass()) {
3493 return false;
3494 } else {
3495 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3496 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3497 // This class will be cached in AOT-initialized state. No need for init barriers.
3498 return false;
3499 } else {
3500 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3501 // must emit barriers to ensure class initialization during production run.
3502 ResourceMark rm(THREAD);
3503 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3504 return true;
3505 }
3506 }
3507 #else
3508 return false;
3509 #endif // INCLUDE_CDS
3510 JVM_END
3511
3512 // Returns an array of all live Thread objects (VM internal JavaThreads,
3513 // jvmti agent threads, and JNI attaching threads are skipped)
3514 // See CR 6404306 regarding JNI attaching threads
3515 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3516 ResourceMark rm(THREAD);
3517 ThreadsListEnumerator tle(THREAD, false, false);
3518 JvmtiVMObjectAllocEventCollector oam;
3519
3520 int num_threads = tle.num_threads();
3521 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3522 objArrayHandle threads_ah(THREAD, r);
3523
3524 for (int i = 0; i < num_threads; i++) {
3525 Handle h = tle.get_threadObj(i);
3526 threads_ah->obj_at_put(i, h());
3527 }
3528
3529 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3530 JVM_END
3531
3532
3533 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3534 // Return StackTraceElement[][], each element is the stack trace of a thread in
3535 // the corresponding entry in the given threads array
3536 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3537 JvmtiVMObjectAllocEventCollector oam;
3538
3539 // Check if threads is null
3540 if (threads == nullptr) {
3541 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3542 }
3543
3544 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3545 objArrayHandle ah(THREAD, a);
3546 int num_threads = ah->length();
3547 // check if threads is non-empty array
3548 if (num_threads == 0) {
3549 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3550 }
3551
3552 // check if threads is not an array of objects of Thread class
3553 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3554 if (k != vmClasses::Thread_klass()) {
3555 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3556 }
3557
3558 ResourceMark rm(THREAD);
3559
3560 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3561 for (int i = 0; i < num_threads; i++) {
3562 oop thread_obj = ah->obj_at(i);
3563 instanceHandle h(THREAD, (instanceOop) thread_obj);
3564 thread_handle_array->append(h);
3565 }
3566
3567 // The JavaThread references in thread_handle_array are validated
3568 // in VM_ThreadDump::doit().
3569 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3570 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3571
3572 JVM_END
3573
3574 // JVM monitoring and management support
3575 JVM_LEAF(void*, JVM_GetManagement(jint version))
3576 return Management::get_jmm_interface(version);
3577 JVM_END
3578
3579 // com.sun.tools.attach.VirtualMachine agent properties support
3580 //
3581 // Initialize the agent properties with the properties maintained in the VM
3582 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3583 ResourceMark rm;
3584
3585 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3586
3587 PUTPROP(props, "sun.java.command", Arguments::java_command());
3588 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3589 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3590 return properties;
3591 JVM_END
3592
3593 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3594 {
3595 JvmtiVMObjectAllocEventCollector oam;
3596
3597 if (ofClass == nullptr) {
3598 return nullptr;
3599 }
3600 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3601 // Special handling for primitive objects
3602 if (java_lang_Class::is_primitive(mirror())) {
3603 return nullptr;
3604 }
3605 Klass* k = java_lang_Class::as_Klass(mirror());
3606 if (!k->is_instance_klass()) {
3607 return nullptr;
3608 }
3609 InstanceKlass* ik = InstanceKlass::cast(k);
3610 int encl_method_class_idx = ik->enclosing_method_class_index();
3611 if (encl_method_class_idx == 0) {
3612 return nullptr;
3613 }
3614 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3615 objArrayHandle dest(THREAD, dest_o);
3616 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3617 dest->obj_at_put(0, enc_k->java_mirror());
3618 int encl_method_method_idx = ik->enclosing_method_method_index();
3619 if (encl_method_method_idx != 0) {
3620 Symbol* sym = ik->constants()->symbol_at(
3621 extract_low_short_from_int(
3622 ik->constants()->name_and_type_at(encl_method_method_idx)));
3623 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3624 dest->obj_at_put(1, str());
3625 sym = ik->constants()->symbol_at(
3626 extract_high_short_from_int(
3627 ik->constants()->name_and_type_at(encl_method_method_idx)));
3628 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3629 dest->obj_at_put(2, str());
3630 }
3631 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3632 }
3633 JVM_END
3634
3635 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3636 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3637 ResourceMark rm(THREAD);
3638
3639 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3640 return nullptr;
3641 }
3642
3643 char** vm_flags = Arguments::jvm_flags_array();
3644 char** vm_args = Arguments::jvm_args_array();
3645 int num_flags = Arguments::num_jvm_flags();
3646 int num_args = Arguments::num_jvm_args();
3647
3648 InstanceKlass* ik = vmClasses::String_klass();
3649 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3650 objArrayHandle result_h(THREAD, r);
3651
3652 int index = 0;
3653 for (int j = 0; j < num_flags; j++, index++) {
3654 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3655 result_h->obj_at_put(index, h());
3656 }
3657 for (int i = 0; i < num_args; i++, index++) {
3658 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3659 result_h->obj_at_put(index, h());
3660 }
3661 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3662 JVM_END
3663
3664 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3665 return os::get_signal_number(name);
3666 JVM_END
3667
3668 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3669 #if INCLUDE_JVMTI
3670 if (!DoJVMTIVirtualThreadTransitions) {
3671 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3672 return;
3673 }
3674 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3675 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3676 } else {
3677 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3678 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3679 }
3680 #endif
3681 JVM_END
3682
3683 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3684 #if INCLUDE_JVMTI
3685 if (!DoJVMTIVirtualThreadTransitions) {
3686 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3687 return;
3688 }
3689 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3690 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3691 } else {
3692 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3693 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3694 }
3695 #endif
3696 JVM_END
3697
3698 // If notifications are disabled then just update the VTMS transition bit and return.
3699 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3700 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3701 #if INCLUDE_JVMTI
3702 if (!DoJVMTIVirtualThreadTransitions) {
3703 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3704 return;
3705 }
3706 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3707 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3708 } else {
3709 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3710 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3711 }
3712 #endif
3713 JVM_END
3714
3715 // If notifications are disabled then just update the VTMS transition bit and return.
3716 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3717 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3718 #if INCLUDE_JVMTI
3719 if (!DoJVMTIVirtualThreadTransitions) {
3720 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3721 return;
3722 }
3723 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3724 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3725 } else {
3726 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3727 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3728 }
3729 #endif
3730 JVM_END
3731
3732 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3733 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3734 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3735 #if INCLUDE_JVMTI
3736 if (!DoJVMTIVirtualThreadTransitions) {
3737 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3738 return;
3739 }
3740 assert(thread->is_disable_suspend() != (bool)enter,
3741 "nested or unbalanced monitor enter/exit is not allowed");
3742 thread->toggle_is_disable_suspend();
3743 #endif
3744 JVM_END
3745
3746 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3747 #if INCLUDE_JFR
3748 freeze_result result = THREAD->last_freeze_fail_result();
3749 assert(result != freeze_ok, "sanity check");
3750 EventVirtualThreadPinned event(UNTIMED);
3751 event.set_starttime(THREAD->last_freeze_fail_time());
3752 if (event.should_commit()) {
3753 ResourceMark rm(THREAD);
3754 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3755 THREAD->post_vthread_pinned_event(&event, str, result);
3756 }
3757 #endif
3758 JVM_END
3759
3760 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3761 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3762 assert(parkEvent != nullptr, "not initialized");
3763
3764 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3765 oop vthread_head = nullptr;
3766 while (true) {
3767 if (list_head.peek() != nullptr) {
3768 for (;;) {
3769 oop head = list_head.resolve();
3770 if (list_head.cmpxchg(head, nullptr) == head) {
3771 return JNIHandles::make_local(THREAD, head);
3772 }
3773 }
3774 }
3775 ThreadBlockInVM tbivm(THREAD);
3776 parkEvent->park();
3777 }
3778 JVM_END
3779 /*
3780 * Return the current class's class file version. The low order 16 bits of the
3781 * returned jint contain the class's major version. The high order 16 bits
3782 * contain the class's minor version.
3783 */
3784 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3785 oop mirror = JNIHandles::resolve_non_null(current);
3786 if (java_lang_Class::is_primitive(mirror)) {
3787 // return latest major version and minor version of 0.
3788 return JVM_CLASSFILE_MAJOR_VERSION;
3789 }
3790 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3791 return (ik->minor_version() << 16) | ik->major_version();
3792 JVM_END
3793
3794 /*
3795 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3796 * get the value will see a materialized value and not a scalar-replaced
3797 * null value.
3798 */
3799 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3800 JVM_EnsureMaterializedForStackWalk(env, value);
3801 JVM_END
3802
3803 /*
3804 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3805 */
3806 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3807 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3808 JVM_END