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.
803 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
804 jboolean init, jobject loader))
805 TempNewSymbol h_name =
806 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
807 CHECK_NULL);
808
809 oop loader_oop = JNIHandles::resolve(loader);
810 Handle h_loader(THREAD, loader_oop);
811
812 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
813 false, THREAD);
814
815 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
816 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
817 }
818 return result;
819 JVM_END
820
821 // Currently only called from the old verifier.
822 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
823 jboolean init, jclass from))
824 TempNewSymbol h_name =
825 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
826 CHECK_NULL);
827 oop from_class_oop = JNIHandles::resolve(from);
828 assert(from_class_oop != nullptr, "must be");
829 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
830 assert(from_class != nullptr, "must be");
831 oop class_loader = from_class->class_loader();
832
833 Handle h_loader(THREAD, class_loader);
834 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
835
836 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
837 // this function is generally only used for class loading during verification.
838 ResourceMark rm;
839 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
840 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
841 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
842 }
843
844 #if INCLUDE_CDS
845 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
846 InstanceKlass* ik = InstanceKlass::cast(from_class);
847 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
848 }
849 #endif
850
851 return result;
852 JVM_END
853
854 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
855 static jclass jvm_define_class_common(const char *name,
856 jobject loader, const jbyte *buf,
857 jsize len, jobject pd, const char *source,
858 TRAPS) {
859 if (source == nullptr) source = "__JVM_DefineClass__";
860
861 JavaThread* jt = THREAD;
862
863 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
864 ClassLoader::perf_define_appclass_selftime(),
865 ClassLoader::perf_define_appclasses(),
866 jt->get_thread_stat()->perf_recursion_counts_addr(),
867 jt->get_thread_stat()->perf_timers_addr(),
868 PerfClassTraceTime::DEFINE_CLASS);
869
870 if (UsePerfData) {
871 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
872 }
873
874 // Class resolution will get the class name from the .class stream if the name is null.
875 TempNewSymbol class_name = name == nullptr ? nullptr :
876 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
877 CHECK_NULL);
878
879 ResourceMark rm(THREAD);
880 ClassFileStream st((u1*)buf, len, source);
881 Handle class_loader (THREAD, JNIHandles::resolve(loader));
882 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
883 ClassLoadInfo cl_info(protection_domain);
884 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
885 class_loader,
886 cl_info,
887 CHECK_NULL);
888
889 if (log_is_enabled(Debug, class, resolve)) {
890 trace_class_resolution(k);
891 }
892
893 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
894 }
895
896 enum {
897 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
898 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
899 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
900 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
901 };
902
903 /*
904 * Define a class with the specified flags that indicates if it's a nestmate,
905 * hidden, or strongly referenced from class loader.
906 */
907 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
908 const jbyte *buf, jsize len, jobject pd,
909 jboolean init, int flags, jobject classData, TRAPS) {
910 ResourceMark rm(THREAD);
911
912 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
913 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
914 if (lookup_k == nullptr) {
915 // The error message is wrong. We come here only if lookup is a primitive class
916 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
917 }
918
919 Handle class_loader (THREAD, lookup_k->class_loader());
920
921 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
922 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
923 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
924 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
925
926 InstanceKlass* host_class = nullptr;
927 if (is_nestmate) {
928 host_class = lookup_k->nest_host(CHECK_NULL);
929 }
930
931 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
932 name,
933 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
934 is_nestmate ? host_class->external_name() : "",
935 is_hidden ? "hidden" : "not hidden",
936 is_strong ? "strong" : "weak",
937 vm_annotations ? "with vm annotations" : "without vm annotation");
938
939 if (!is_hidden) {
940 // classData is only applicable for hidden classes
941 if (classData != nullptr) {
942 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
943 }
944 if (is_nestmate) {
945 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
946 }
947 if (!is_strong) {
948 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
949 }
950 if (vm_annotations) {
951 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
952 }
953 if (flags != STRONG_LOADER_LINK) {
954 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
955 err_msg("invalid flag 0x%x", flags));
956 }
957 }
958
959 // Class resolution will get the class name from the .class stream if the name is null.
960 TempNewSymbol class_name = name == nullptr ? nullptr :
961 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
962 CHECK_NULL);
963
964 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
965 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
966 ClassFileStream st((u1*)buf, len, source);
967
968 InstanceKlass* ik = nullptr;
969 if (!is_hidden) {
970 ClassLoadInfo cl_info(protection_domain);
971 ik = SystemDictionary::resolve_from_stream(&st, class_name,
972 class_loader,
973 cl_info,
974 CHECK_NULL);
975
976 if (log_is_enabled(Debug, class, resolve)) {
977 trace_class_resolution(ik);
978 }
979 } else { // hidden
980 Handle classData_h(THREAD, JNIHandles::resolve(classData));
981 ClassLoadInfo cl_info(protection_domain,
982 host_class,
983 classData_h,
984 is_hidden,
985 is_strong,
986 vm_annotations);
987 ik = SystemDictionary::resolve_from_stream(&st, class_name,
988 class_loader,
989 cl_info,
990 CHECK_NULL);
991
992 // The hidden class loader data has been artificially been kept alive to
993 // this point. The mirror and any instances of this class have to keep
994 // it alive afterwards.
995 ik->class_loader_data()->dec_keep_alive_ref_count();
996
997 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
998 ModuleEntry* module = ik->module();
999 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1000 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1001 module_name,
1002 ik->external_name(),
1003 host_class->external_name(),
1004 ik->is_hidden() ? "is hidden" : "is not hidden");
1005 }
1006 }
1007
1008 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1009 // non-hidden class or nestmate class must be in the same package as the Lookup class
1010 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1011 }
1012
1013 if (init) {
1014 ik->initialize(CHECK_NULL);
1015 } else {
1016 ik->link_class(CHECK_NULL);
1017 }
1018
1019 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1020 }
1021
1022 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1023 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1024 JVM_END
1025
1026 /*
1027 * Define a class with the specified lookup class.
1028 * lookup: Lookup class
1029 * name: the name of the class
1030 * buf: class bytes
1031 * len: length of class bytes
1032 * pd: protection domain
1033 * init: initialize the class
1034 * flags: properties of the class
1035 * classData: private static pre-initialized field
1036 */
1037 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1038 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1039
1040 if (lookup == nullptr) {
1041 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1042 }
1043
1044 assert(buf != nullptr, "buf must not be null");
1045
1046 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1047 JVM_END
1048
1049 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1050
1051 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1052 JVM_END
1053
1054 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1055 ResourceMark rm(THREAD);
1056
1057 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1058 char* str = java_lang_String::as_utf8_string(h_name());
1059
1060 // Sanity check, don't expect null
1061 if (str == nullptr) return nullptr;
1062
1063 // Internalize the string, converting '.' to '/' in string.
1064 char* p = (char*)str;
1065 while (*p != '\0') {
1066 if (*p == '.') {
1067 *p = '/';
1068 }
1069 p++;
1070 }
1071
1072 const int str_len = (int)(p - str);
1073 if (str_len > Symbol::max_length()) {
1074 // It's impossible to create this class; the name cannot fit
1075 // into the constant pool.
1076 return nullptr;
1077 }
1078 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1079
1080 // Security Note:
1081 // The Java level wrapper will perform the necessary security check allowing
1082 // us to pass the null as the initiating class loader.
1083 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1084 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1085 #if INCLUDE_CDS
1086 if (k == nullptr) {
1087 // If the class is not already loaded, try to see if it's in the shared
1088 // archive for the current classloader (h_loader).
1089 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1090 }
1091 #endif
1092 return (k == nullptr) ? nullptr :
1093 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1094 JVM_END
1095
1096 // Module support //////////////////////////////////////////////////////////////////////////////
1097
1098 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1099 jstring location, jobjectArray packages))
1100 Handle h_module (THREAD, JNIHandles::resolve(module));
1101 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1102 JVM_END
1103
1104 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1105 Handle h_module (THREAD, JNIHandles::resolve(module));
1106 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1107 JVM_END
1108
1109 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1110 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1111 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1112 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1113 JVM_END
1114
1115 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1116 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1117 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1118 JVM_END
1119
1120 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1121 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1122 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1123 JVM_END
1124
1125 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1126 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1127 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1128 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1129 JVM_END
1130
1131 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1132 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1133 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1134 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1135 JVM_END
1136
1137 // Reflection support //////////////////////////////////////////////////////////////////////////////
1138
1139 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1140 assert (cls != nullptr, "illegal class");
1141 JvmtiVMObjectAllocEventCollector oam;
1142 ResourceMark rm(THREAD);
1143 HandleMark hm(THREAD);
1144 Handle java_class(THREAD, JNIHandles::resolve(cls));
1145 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1146 return (jstring) JNIHandles::make_local(THREAD, result);
1147 JVM_END
1148
1149
1150 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1151 JvmtiVMObjectAllocEventCollector oam;
1152 oop mirror = JNIHandles::resolve_non_null(cls);
1153
1154 // Special handling for primitive objects
1155 if (java_lang_Class::is_primitive(mirror)) {
1156 // Primitive objects does not have any interfaces
1157 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1158 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1159 }
1160
1161 Klass* klass = java_lang_Class::as_Klass(mirror);
1162 // Figure size of result array
1163 int size;
1164 if (klass->is_instance_klass()) {
1165 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1166 } else {
1167 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1168 size = 2;
1169 }
1170
1171 // Allocate result array
1172 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1173 objArrayHandle result (THREAD, r);
1174 // Fill in result
1175 if (klass->is_instance_klass()) {
1176 // Regular instance klass, fill in all local interfaces
1177 for (int index = 0; index < size; index++) {
1178 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1179 result->obj_at_put(index, k->java_mirror());
1180 }
1181 } else {
1182 // All arrays implement java.lang.Cloneable and java.io.Serializable
1183 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1184 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1185 }
1186 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1187 JVM_END
1188
1189
1190 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1191 oop mirror = JNIHandles::resolve_non_null(cls);
1192 if (java_lang_Class::is_primitive(mirror)) {
1193 return JNI_FALSE;
1194 }
1195 Klass* k = java_lang_Class::as_Klass(mirror);
1196 return k->is_hidden();
1197 JVM_END
1198
1199
1200 class ScopedValueBindingsResolver {
1201 public:
1202 InstanceKlass* Carrier_klass;
1203 ScopedValueBindingsResolver(JavaThread* THREAD) {
1204 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1205 Carrier_klass = InstanceKlass::cast(k);
1206 }
1207 };
1208
1209 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1210 ResourceMark rm(THREAD);
1211 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1212 JvmtiVMObjectAllocEventCollector oam;
1213
1214 static ScopedValueBindingsResolver resolver(THREAD);
1215
1216 // Iterate through Java frames
1217 vframeStream vfst(thread);
1218 for(; !vfst.at_end(); vfst.next()) {
1219 int loc = -1;
1220 // get method of frame
1221 Method* method = vfst.method();
1222
1223 Symbol *name = method->name();
1224
1225 InstanceKlass* holder = method->method_holder();
1226 if (name == vmSymbols::runWith_method_name()) {
1227 if (holder == vmClasses::Thread_klass()
1228 || holder == resolver.Carrier_klass) {
1229 loc = 1;
1230 }
1231 }
1232
1233 if (loc != -1) {
1234 javaVFrame *frame = vfst.asJavaVFrame();
1235 StackValueCollection* locals = frame->locals();
1236 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1237 Handle result = head_sv->get_obj();
1238 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1239 if (result() != nullptr) {
1240 return JNIHandles::make_local(THREAD, result());
1241 }
1242 }
1243 }
1244
1245 return nullptr;
1246 JVM_END
1247
1248 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1249 JvmtiVMObjectAllocEventCollector oam;
1250 // ofClass is a reference to a java_lang_Class object. The mirror object
1251 // of an InstanceKlass
1252 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1253 if (java_lang_Class::is_primitive(ofMirror) ||
1254 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1255 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1256 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1257 }
1258
1259 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1260 InnerClassesIterator iter(k);
1261
1262 if (iter.length() == 0) {
1263 // Neither an inner nor outer class
1264 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1265 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1266 }
1267
1268 // find inner class info
1269 constantPoolHandle cp(thread, k->constants());
1270 int length = iter.length();
1271
1272 // Allocate temp. result array
1273 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1274 objArrayHandle result (THREAD, r);
1275 int members = 0;
1276
1277 for (; !iter.done(); iter.next()) {
1278 int ioff = iter.inner_class_info_index();
1279 int ooff = iter.outer_class_info_index();
1280
1281 if (ioff != 0 && ooff != 0) {
1282 // Check to see if the name matches the class we're looking for
1283 // before attempting to find the class.
1284 if (cp->klass_name_at_matches(k, ooff)) {
1285 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1286 if (outer_klass == k) {
1287 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1288 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1289
1290 // Throws an exception if outer klass has not declared k as
1291 // an inner klass
1292 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1293
1294 result->obj_at_put(members, inner_klass->java_mirror());
1295 members++;
1296 }
1297 }
1298 }
1299 }
1300
1301 if (members != length) {
1302 // Return array of right length
1303 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1304 for(int i = 0; i < members; i++) {
1305 res->obj_at_put(i, result->obj_at(i));
1306 }
1307 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1308 }
1309
1310 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1311 JVM_END
1312
1313
1314 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1315 {
1316 // ofClass is a reference to a java_lang_Class object.
1317 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1318 if (java_lang_Class::is_primitive(ofMirror)) {
1319 return nullptr;
1320 }
1321 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1322 if (!klass->is_instance_klass()) {
1323 return nullptr;
1324 }
1325
1326 bool inner_is_member = false;
1327 Klass* outer_klass
1328 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1329 if (outer_klass == nullptr) return nullptr; // already a top-level class
1330 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1331 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1332 }
1333 JVM_END
1334
1335 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1336 {
1337 oop mirror = JNIHandles::resolve_non_null(cls);
1338 if (java_lang_Class::is_primitive(mirror)) {
1339 return nullptr;
1340 }
1341 Klass* klass = java_lang_Class::as_Klass(mirror);
1342 if (!klass->is_instance_klass()) {
1343 return nullptr;
1344 }
1345 InstanceKlass* k = InstanceKlass::cast(klass);
1346 int ooff = 0, noff = 0;
1347 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1348 if (noff != 0) {
1349 constantPoolHandle i_cp(thread, k->constants());
1350 Symbol* name = i_cp->symbol_at(noff);
1351 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1352 return (jstring) JNIHandles::make_local(THREAD, str());
1353 }
1354 }
1355 return nullptr;
1356 }
1357 JVM_END
1358
1359 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1360 assert (cls != nullptr, "illegal class");
1361 JvmtiVMObjectAllocEventCollector oam;
1362 ResourceMark rm(THREAD);
1363 oop mirror = JNIHandles::resolve_non_null(cls);
1364 // Return null for arrays and primitives
1365 if (!java_lang_Class::is_primitive(mirror)) {
1366 Klass* k = java_lang_Class::as_Klass(mirror);
1367 if (k->is_instance_klass()) {
1368 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1369 if (sym == nullptr) return nullptr;
1370 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1371 return (jstring) JNIHandles::make_local(THREAD, str());
1372 }
1373 }
1374 return nullptr;
1375 JVM_END
1376
1377
1378 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1379 assert (cls != nullptr, "illegal class");
1380 oop mirror = JNIHandles::resolve_non_null(cls);
1381 // Return null for arrays and primitives
1382 if (!java_lang_Class::is_primitive(mirror)) {
1383 Klass* k = java_lang_Class::as_Klass(mirror);
1384 if (k->is_instance_klass()) {
1385 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1386 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1387 }
1388 }
1389 return nullptr;
1390 JVM_END
1391
1392
1393 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1394 // some of this code was adapted from from jni_FromReflectedField
1395
1396 oop reflected = JNIHandles::resolve_non_null(field);
1397 oop mirror = java_lang_reflect_Field::clazz(reflected);
1398 int slot = java_lang_reflect_Field::slot(reflected);
1399 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1400
1401 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1402 int offset = ik->field_offset(slot);
1403
1404 if (modifiers & JVM_ACC_STATIC) {
1405 // for static fields we only look in the current class
1406 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1407 assert(false, "cannot find static field");
1408 return false;
1409 }
1410 } else {
1411 // for instance fields we start with the current class and work
1412 // our way up through the superclass chain
1413 if (!ik->find_field_from_offset(offset, false, &fd)) {
1414 assert(false, "cannot find instance field");
1415 return false;
1416 }
1417 }
1418 return true;
1419 }
1420
1421 static Method* jvm_get_method_common(jobject method) {
1422 // some of this code was adapted from from jni_FromReflectedMethod
1423
1424 oop reflected = JNIHandles::resolve_non_null(method);
1425 oop mirror = nullptr;
1426 int slot = 0;
1427
1428 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1429 mirror = java_lang_reflect_Constructor::clazz(reflected);
1430 slot = java_lang_reflect_Constructor::slot(reflected);
1431 } else {
1432 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1433 "wrong type");
1434 mirror = java_lang_reflect_Method::clazz(reflected);
1435 slot = java_lang_reflect_Method::slot(reflected);
1436 }
1437 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1438
1439 Method* m = ik->method_with_idnum(slot);
1440 assert(m != nullptr, "cannot find method");
1441 return m; // caller has to deal with null in product mode
1442 }
1443
1444 /* Type use annotations support (JDK 1.8) */
1445
1446 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1447 assert (cls != nullptr, "illegal class");
1448 ResourceMark rm(THREAD);
1449 // Return null for arrays and primitives
1450 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1452 if (k->is_instance_klass()) {
1453 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1454 if (type_annotations != nullptr) {
1455 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1456 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1457 }
1458 }
1459 }
1460 return nullptr;
1461 JVM_END
1462
1463 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1464 assert (method != nullptr, "illegal method");
1465 // method is a handle to a java.lang.reflect.Method object
1466 Method* m = jvm_get_method_common(method);
1467 if (m == nullptr) {
1468 return nullptr;
1469 }
1470
1471 AnnotationArray* type_annotations = m->type_annotations();
1472 if (type_annotations != nullptr) {
1473 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1474 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1475 }
1476
1477 return nullptr;
1478 JVM_END
1479
1480 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1481 assert (field != nullptr, "illegal field");
1482 fieldDescriptor fd;
1483 bool gotFd = jvm_get_field_common(field, fd);
1484 if (!gotFd) {
1485 return nullptr;
1486 }
1487
1488 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1489 JVM_END
1490
1491 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1492 if (!cp->is_within_bounds(index)) {
1493 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1494 }
1495 }
1496
1497 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1498 {
1499 // method is a handle to a java.lang.reflect.Method object
1500 Method* method_ptr = jvm_get_method_common(method);
1501 methodHandle mh (THREAD, method_ptr);
1502 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1503 const int num_params = mh->method_parameters_length();
1504
1505 if (num_params < 0) {
1506 // A -1 return value from method_parameters_length means there is no
1507 // parameter data. Return null to indicate this to the reflection
1508 // API.
1509 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1510 return (jobjectArray)nullptr;
1511 } else {
1512 // Otherwise, we return something up to reflection, even if it is
1513 // a zero-length array. Why? Because in some cases this can
1514 // trigger a MalformedParametersException.
1515
1516 // make sure all the symbols are properly formatted
1517 for (int i = 0; i < num_params; i++) {
1518 MethodParametersElement* params = mh->method_parameters_start();
1519 int index = params[i].name_cp_index;
1520 constantPoolHandle cp(THREAD, mh->constants());
1521 bounds_check(cp, index, CHECK_NULL);
1522
1523 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1524 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1525 "Wrong type at constant pool index");
1526 }
1527
1528 }
1529
1530 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1531 objArrayHandle result (THREAD, result_oop);
1532
1533 for (int i = 0; i < num_params; i++) {
1534 MethodParametersElement* params = mh->method_parameters_start();
1535 // For a 0 index, give a null symbol
1536 Symbol* sym = 0 != params[i].name_cp_index ?
1537 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1538 int flags = params[i].flags;
1539 oop param = Reflection::new_parameter(reflected_method, i, sym,
1540 flags, CHECK_NULL);
1541 result->obj_at_put(i, param);
1542 }
1543 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1544 }
1545 }
1546 JVM_END
1547
1548 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1549
1550 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1551 {
1552 JvmtiVMObjectAllocEventCollector oam;
1553
1554 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1555 // Exclude primitive types and array types
1556 if (java_lang_Class::is_primitive(ofMirror) ||
1557 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1558 // Return empty array
1559 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1560 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1561 }
1562
1563 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1564 constantPoolHandle cp(THREAD, k->constants());
1565
1566 // Ensure class is linked
1567 k->link_class(CHECK_NULL);
1568
1569 // Allocate result
1570 int num_fields;
1571
1572 if (publicOnly) {
1573 num_fields = 0;
1574 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1575 if (fs.access_flags().is_public()) ++num_fields;
1576 }
1577 } else {
1578 num_fields = k->java_fields_count();
1579 }
1580
1581 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1582 objArrayHandle result (THREAD, r);
1583
1584 int out_idx = 0;
1585 fieldDescriptor fd;
1586 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1587 if (!publicOnly || fs.access_flags().is_public()) {
1588 fd.reinitialize(k, fs.to_FieldInfo());
1589 oop field = Reflection::new_field(&fd, CHECK_NULL);
1590 result->obj_at_put(out_idx, field);
1591 ++out_idx;
1592 }
1593 }
1594 assert(out_idx == num_fields, "just checking");
1595 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1596 }
1597 JVM_END
1598
1599 // A class is a record if and only if it is final and a direct subclass of
1600 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1601 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1602 {
1603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1604 if (k != nullptr && k->is_instance_klass()) {
1605 InstanceKlass* ik = InstanceKlass::cast(k);
1606 return ik->is_record();
1607 } else {
1608 return false;
1609 }
1610 }
1611 JVM_END
1612
1613 // Returns an array containing the components of the Record attribute,
1614 // or null if the attribute is not present.
1615 //
1616 // Note that this function returns the components of the Record attribute
1617 // even if the class is not a record.
1618 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1619 {
1620 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1621
1622 Array<RecordComponent*>* components = ik->record_components();
1623 if (components != nullptr) {
1624 JvmtiVMObjectAllocEventCollector oam;
1625 constantPoolHandle cp(THREAD, ik->constants());
1626 int length = components->length();
1627 assert(length >= 0, "unexpected record_components length");
1628 objArrayOop record_components =
1629 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1630 objArrayHandle components_h (THREAD, record_components);
1631
1632 for (int x = 0; x < length; x++) {
1633 RecordComponent* component = components->at(x);
1634 assert(component != nullptr, "unexpected null record component");
1635 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1636 components_h->obj_at_put(x, component_oop);
1637 }
1638 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1639 }
1640
1641 return nullptr;
1642 }
1643 JVM_END
1644
1645 static jobjectArray get_class_declared_methods_helper(
1646 JNIEnv *env,
1647 jclass ofClass, jboolean publicOnly,
1648 bool want_constructor,
1649 Klass* klass, TRAPS) {
1650
1651 JvmtiVMObjectAllocEventCollector oam;
1652
1653 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1654 // Exclude primitive types and array types
1655 if (java_lang_Class::is_primitive(ofMirror)
1656 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1657 // Return empty array
1658 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1659 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1660 }
1661
1662 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1663
1664 // Ensure class is linked
1665 k->link_class(CHECK_NULL);
1666
1667 Array<Method*>* methods = k->methods();
1668 int methods_length = methods->length();
1669
1670 // Save original method_idnum in case of redefinition, which can change
1671 // the idnum of obsolete methods. The new method will have the same idnum
1672 // but if we refresh the methods array, the counts will be wrong.
1673 ResourceMark rm(THREAD);
1674 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1675 int num_methods = 0;
1676
1677 // Select methods matching the criteria.
1678 for (int i = 0; i < methods_length; i++) {
1679 Method* method = methods->at(i);
1680 if (want_constructor && !method->is_object_initializer()) {
1681 continue;
1682 }
1683 if (!want_constructor &&
1684 (method->is_object_initializer() || method->is_static_initializer() ||
1685 method->is_overpass())) {
1686 continue;
1687 }
1688 if (publicOnly && !method->is_public()) {
1689 continue;
1690 }
1691 idnums->push(method->method_idnum());
1692 ++num_methods;
1693 }
1694
1695 // Allocate result
1696 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1697 objArrayHandle result (THREAD, r);
1698
1699 // Now just put the methods that we selected above, but go by their idnum
1700 // in case of redefinition. The methods can be redefined at any safepoint,
1701 // so above when allocating the oop array and below when creating reflect
1702 // objects.
1703 for (int i = 0; i < num_methods; i++) {
1704 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1705 if (method.is_null()) {
1706 // Method may have been deleted and seems this API can handle null
1707 // Otherwise should probably put a method that throws NSME
1708 result->obj_at_put(i, nullptr);
1709 } else {
1710 oop m;
1711 if (want_constructor) {
1712 m = Reflection::new_constructor(method, CHECK_NULL);
1713 } else {
1714 m = Reflection::new_method(method, false, CHECK_NULL);
1715 }
1716 result->obj_at_put(i, m);
1717 }
1718 }
1719
1720 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1721 }
1722
1723 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1724 {
1725 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1726 /*want_constructor*/ false,
1727 vmClasses::reflect_Method_klass(), THREAD);
1728 }
1729 JVM_END
1730
1731 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1732 {
1733 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1734 /*want_constructor*/ true,
1735 vmClasses::reflect_Constructor_klass(), THREAD);
1736 }
1737 JVM_END
1738
1739 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1740 {
1741 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1742 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1743 return c->has_nestmate_access_to(m, THREAD);
1744 }
1745 JVM_END
1746
1747 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1748 {
1749 // current is not a primitive or array class
1750 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1751 InstanceKlass* host = c->nest_host(THREAD);
1752 return (jclass) (host == nullptr ? nullptr :
1753 JNIHandles::make_local(THREAD, host->java_mirror()));
1754 }
1755 JVM_END
1756
1757 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1758 {
1759 // current is not a primitive or array class
1760 ResourceMark rm(THREAD);
1761 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1762 InstanceKlass* host = c->nest_host(THREAD);
1763
1764 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1765 c->external_name(), host->external_name());
1766 {
1767 JvmtiVMObjectAllocEventCollector oam;
1768 Array<u2>* members = host->nest_members();
1769 int length = members == nullptr ? 0 : members->length();
1770
1771 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1772
1773 // nest host is first in the array so make it one bigger
1774 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1775 length + 1, CHECK_NULL);
1776 objArrayHandle result(THREAD, r);
1777 result->obj_at_put(0, host->java_mirror());
1778 if (length != 0) {
1779 int count = 0;
1780 for (int i = 0; i < length; i++) {
1781 int cp_index = members->at(i);
1782 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1783 if (HAS_PENDING_EXCEPTION) {
1784 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1785 return nullptr; // propagate VMEs
1786 }
1787 if (log_is_enabled(Trace, class, nestmates)) {
1788 stringStream ss;
1789 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1790 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1791 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1792 log_trace(class, nestmates)("%s", ss.as_string());
1793 }
1794 CLEAR_PENDING_EXCEPTION;
1795 continue;
1796 }
1797 if (k->is_instance_klass()) {
1798 InstanceKlass* ik = InstanceKlass::cast(k);
1799 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1800 if (nest_host_k == host) {
1801 result->obj_at_put(count+1, k->java_mirror());
1802 count++;
1803 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1804 } else {
1805 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1806 ik->external_name(), nest_host_k->external_name());
1807 }
1808 } else {
1809 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1810 k->external_name());
1811 }
1812 }
1813 if (count < length) {
1814 // we had invalid entries so we need to compact the array
1815 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1816 length + 1, count + 1);
1817
1818 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1819 count + 1, CHECK_NULL);
1820 objArrayHandle result2(THREAD, r2);
1821 for (int i = 0; i < count + 1; i++) {
1822 result2->obj_at_put(i, result->obj_at(i));
1823 }
1824 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1825 }
1826 }
1827 else {
1828 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1829 }
1830 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1831 }
1832 }
1833 JVM_END
1834
1835 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1836 {
1837 oop mirror = JNIHandles::resolve_non_null(current);
1838 assert(!java_lang_Class::is_primitive(mirror), "should not be");
1839 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1840
1841 ResourceMark rm(THREAD);
1842 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
1843 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
1844 if (ik->is_sealed()) {
1845 JvmtiVMObjectAllocEventCollector oam;
1846 Array<u2>* subclasses = ik->permitted_subclasses();
1847 int length = subclasses->length();
1848
1849 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
1850
1851 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1852 length, CHECK_NULL);
1853 objArrayHandle result(THREAD, r);
1854 int count = 0;
1855 for (int i = 0; i < length; i++) {
1856 int cp_index = subclasses->at(i);
1857 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
1858 if (HAS_PENDING_EXCEPTION) {
1859 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1860 return nullptr; // propagate VMEs
1861 }
1862 if (log_is_enabled(Trace, class, sealed)) {
1863 stringStream ss;
1864 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
1865 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
1866 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1867 log_trace(class, sealed)("%s", ss.as_string());
1868 }
1869
1870 CLEAR_PENDING_EXCEPTION;
1871 continue;
1872 }
1873 if (k->is_instance_klass()) {
1874 result->obj_at_put(count++, k->java_mirror());
1875 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
1876 }
1877 }
1878 if (count < length) {
1879 // we had invalid entries so we need to compact the array
1880 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1881 count, CHECK_NULL);
1882 objArrayHandle result2(THREAD, r2);
1883 for (int i = 0; i < count; i++) {
1884 result2->obj_at_put(i, result->obj_at(i));
1885 }
1886 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1887 }
1888 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1889 } else {
1890 return nullptr;
1891 }
1892 }
1893 JVM_END
1894
1895 // Constant pool access //////////////////////////////////////////////////////////
1896
1897 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1898 {
1899 JvmtiVMObjectAllocEventCollector oam;
1900 oop mirror = JNIHandles::resolve_non_null(cls);
1901 // Return null for primitives and arrays
1902 if (!java_lang_Class::is_primitive(mirror)) {
1903 Klass* k = java_lang_Class::as_Klass(mirror);
1904 if (k->is_instance_klass()) {
1905 InstanceKlass* k_h = InstanceKlass::cast(k);
1906 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1907 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1908 return JNIHandles::make_local(THREAD, jcp());
1909 }
1910 }
1911 return nullptr;
1912 }
1913 JVM_END
1914
1915
1916 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
1917 {
1918 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1919 return cp->length();
1920 }
1921 JVM_END
1922
1923
1924 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
1925 {
1926 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1927 bounds_check(cp, index, CHECK_NULL);
1928 constantTag tag = cp->tag_at(index);
1929 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1930 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1931 }
1932 Klass* k = cp->klass_at(index, CHECK_NULL);
1933 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1934 }
1935 JVM_END
1936
1937 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1938 {
1939 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1940 bounds_check(cp, index, CHECK_NULL);
1941 constantTag tag = cp->tag_at(index);
1942 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1943 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1944 }
1945 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1946 if (k == nullptr) return nullptr;
1947 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1948 }
1949 JVM_END
1950
1951 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1952 constantTag tag = cp->tag_at(index);
1953 if (!tag.is_method() && !tag.is_interface_method()) {
1954 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1955 }
1956 int klass_ref = cp->uncached_klass_ref_index_at(index);
1957 Klass* k_o;
1958 if (force_resolution) {
1959 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1960 } else {
1961 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1962 if (k_o == nullptr) return nullptr;
1963 }
1964 InstanceKlass* k = InstanceKlass::cast(k_o);
1965 Symbol* name = cp->uncached_name_ref_at(index);
1966 Symbol* sig = cp->uncached_signature_ref_at(index);
1967 methodHandle m (THREAD, k->find_method(name, sig));
1968 if (m.is_null()) {
1969 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1970 }
1971 oop method;
1972 if (m->is_object_initializer()) {
1973 method = Reflection::new_constructor(m, CHECK_NULL);
1974 } else {
1975 // new_method accepts <clinit> as Method here
1976 method = Reflection::new_method(m, true, CHECK_NULL);
1977 }
1978 return JNIHandles::make_local(THREAD, method);
1979 }
1980
1981 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
1982 {
1983 JvmtiVMObjectAllocEventCollector oam;
1984 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1985 bounds_check(cp, index, CHECK_NULL);
1986 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1987 return res;
1988 }
1989 JVM_END
1990
1991 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1992 {
1993 JvmtiVMObjectAllocEventCollector oam;
1994 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1995 bounds_check(cp, index, CHECK_NULL);
1996 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1997 return res;
1998 }
1999 JVM_END
2000
2001 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2002 constantTag tag = cp->tag_at(index);
2003 if (!tag.is_field()) {
2004 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2005 }
2006 int klass_ref = cp->uncached_klass_ref_index_at(index);
2007 Klass* k_o;
2008 if (force_resolution) {
2009 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2010 } else {
2011 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2012 if (k_o == nullptr) return nullptr;
2013 }
2014 InstanceKlass* k = InstanceKlass::cast(k_o);
2015 Symbol* name = cp->uncached_name_ref_at(index);
2016 Symbol* sig = cp->uncached_signature_ref_at(index);
2017 fieldDescriptor fd;
2018 Klass* target_klass = k->find_field(name, sig, &fd);
2019 if (target_klass == nullptr) {
2020 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2021 }
2022 oop field = Reflection::new_field(&fd, CHECK_NULL);
2023 return JNIHandles::make_local(THREAD, field);
2024 }
2025
2026 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2027 {
2028 JvmtiVMObjectAllocEventCollector oam;
2029 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2030 bounds_check(cp, index, CHECK_NULL);
2031 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2032 return res;
2033 }
2034 JVM_END
2035
2036 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2037 {
2038 JvmtiVMObjectAllocEventCollector oam;
2039 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2040 bounds_check(cp, index, CHECK_NULL);
2041 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2042 return res;
2043 }
2044 JVM_END
2045
2046 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2047 {
2048 JvmtiVMObjectAllocEventCollector oam;
2049 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2050 bounds_check(cp, index, CHECK_NULL);
2051 constantTag tag = cp->tag_at(index);
2052 if (!tag.is_field_or_method()) {
2053 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2054 }
2055 int klass_ref = cp->uncached_klass_ref_index_at(index);
2056 Symbol* klass_name = cp->klass_name_at(klass_ref);
2057 Symbol* member_name = cp->uncached_name_ref_at(index);
2058 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2059 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2060 objArrayHandle dest(THREAD, dest_o);
2061 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2062 dest->obj_at_put(0, str());
2063 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2064 dest->obj_at_put(1, str());
2065 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2066 dest->obj_at_put(2, str());
2067 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2068 }
2069 JVM_END
2070
2071 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2072 {
2073 JvmtiVMObjectAllocEventCollector oam;
2074 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2075 bounds_check(cp, index, CHECK_0);
2076 constantTag tag = cp->tag_at(index);
2077 if (!tag.is_field_or_method()) {
2078 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2079 }
2080 return (jint) cp->uncached_klass_ref_index_at(index);
2081 }
2082 JVM_END
2083
2084 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2085 {
2086 JvmtiVMObjectAllocEventCollector oam;
2087 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2088 bounds_check(cp, index, CHECK_0);
2089 constantTag tag = cp->tag_at(index);
2090 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2091 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2092 }
2093 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2094 }
2095 JVM_END
2096
2097 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2098 {
2099 JvmtiVMObjectAllocEventCollector oam;
2100 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2101 bounds_check(cp, index, CHECK_NULL);
2102 constantTag tag = cp->tag_at(index);
2103 if (!tag.is_name_and_type()) {
2104 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2105 }
2106 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2107 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2108 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2109 objArrayHandle dest(THREAD, dest_o);
2110 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2111 dest->obj_at_put(0, str());
2112 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2113 dest->obj_at_put(1, str());
2114 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2115 }
2116 JVM_END
2117
2118 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2119 {
2120 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2121 bounds_check(cp, index, CHECK_0);
2122 constantTag tag = cp->tag_at(index);
2123 if (!tag.is_int()) {
2124 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2125 }
2126 return cp->int_at(index);
2127 }
2128 JVM_END
2129
2130 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2131 {
2132 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2133 bounds_check(cp, index, CHECK_(0L));
2134 constantTag tag = cp->tag_at(index);
2135 if (!tag.is_long()) {
2136 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2137 }
2138 return cp->long_at(index);
2139 }
2140 JVM_END
2141
2142 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2143 {
2144 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2145 bounds_check(cp, index, CHECK_(0.0f));
2146 constantTag tag = cp->tag_at(index);
2147 if (!tag.is_float()) {
2148 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2149 }
2150 return cp->float_at(index);
2151 }
2152 JVM_END
2153
2154 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2155 {
2156 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2157 bounds_check(cp, index, CHECK_(0.0));
2158 constantTag tag = cp->tag_at(index);
2159 if (!tag.is_double()) {
2160 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2161 }
2162 return cp->double_at(index);
2163 }
2164 JVM_END
2165
2166 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2167 {
2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2169 bounds_check(cp, index, CHECK_NULL);
2170 constantTag tag = cp->tag_at(index);
2171 if (!tag.is_string()) {
2172 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2173 }
2174 oop str = cp->string_at(index, CHECK_NULL);
2175 return (jstring) JNIHandles::make_local(THREAD, str);
2176 }
2177 JVM_END
2178
2179 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2180 {
2181 JvmtiVMObjectAllocEventCollector oam;
2182 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2183 bounds_check(cp, index, CHECK_NULL);
2184 constantTag tag = cp->tag_at(index);
2185 if (!tag.is_symbol()) {
2186 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2187 }
2188 Symbol* sym = cp->symbol_at(index);
2189 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2190 return (jstring) JNIHandles::make_local(THREAD, str());
2191 }
2192 JVM_END
2193
2194 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2195 {
2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2197 bounds_check(cp, index, CHECK_0);
2198 constantTag tag = cp->tag_at(index);
2199 jbyte result = tag.value();
2200 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2201 // they are changed to the corresponding tags from the JVM spec, so that java code in
2202 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2203 if (tag.is_klass_or_reference()) {
2204 result = JVM_CONSTANT_Class;
2205 } else if (tag.is_string_index()) {
2206 result = JVM_CONSTANT_String;
2207 } else if (tag.is_method_type_in_error()) {
2208 result = JVM_CONSTANT_MethodType;
2209 } else if (tag.is_method_handle_in_error()) {
2210 result = JVM_CONSTANT_MethodHandle;
2211 } else if (tag.is_dynamic_constant_in_error()) {
2212 result = JVM_CONSTANT_Dynamic;
2213 }
2214 return result;
2215 }
2216 JVM_END
2217
2218 // Assertion support. //////////////////////////////////////////////////////////
2219
2220 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2221 assert(cls != nullptr, "bad class");
2222
2223 oop r = JNIHandles::resolve(cls);
2224 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2225 if (java_lang_Class::is_primitive(r)) return false;
2226
2227 Klass* k = java_lang_Class::as_Klass(r);
2228 assert(k->is_instance_klass(), "must be an instance klass");
2229 if (!k->is_instance_klass()) return false;
2230
2231 ResourceMark rm(THREAD);
2232 const char* name = k->name()->as_C_string();
2233 bool system_class = k->class_loader() == nullptr;
2234 return JavaAssertions::enabled(name, system_class);
2235
2236 JVM_END
2237
2238
2239 // Return a new AssertionStatusDirectives object with the fields filled in with
2240 // command-line assertion arguments (i.e., -ea, -da).
2241 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2242 JvmtiVMObjectAllocEventCollector oam;
2243 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2244 return JNIHandles::make_local(THREAD, asd);
2245 JVM_END
2246
2247 // Verification ////////////////////////////////////////////////////////////////////////////////
2248
2249 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2250
2251 // RedefineClasses support: bug 6214132 caused verification to fail.
2252 // All functions from this section, unless noted otherwise, should call the functions
2253 // get_klass_considering_redefinition(), or
2254 // get_instance_klass_considering_redefinition()
2255 // These functions return JvmtiThreadState::_scratch_class if the verifier
2256 // was invoked in the middle of the redefinition of cls.
2257 // See jvmtiThreadState.hpp for details.
2258
2259 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2260 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2261 if (k->is_instance_klass()) {
2262 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2263 } else {
2264 return k;
2265 }
2266 }
2267
2268 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2269 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2270 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2271 }
2272
2273 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2274 oop mirror = JNIHandles::resolve_non_null(cls);
2275 if (java_lang_Class::is_primitive(mirror)) {
2276 return JNI_FALSE;
2277 }
2278 Klass* k = java_lang_Class::as_Klass(mirror);
2279 // This isn't necessary since answer is the same because redefinition
2280 // has already checked this matches for the scratch class.
2281 // k = get_klass_considering_redefinition(cls, thread)
2282 jboolean result = k->is_interface();
2283 assert(!result || k->is_instance_klass(),
2284 "all interfaces are instance types");
2285 return result;
2286 JVM_END
2287
2288 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2289 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2290 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2291 return k->name()->as_utf8();
2292 JVM_END
2293
2294
2295 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2296 Klass* k = get_klass_considering_redefinition(cls, thread);
2297 // types will have length zero if this is not an InstanceKlass
2298 // (length is determined by call to JVM_GetClassCPEntriesCount)
2299 if (k->is_instance_klass()) {
2300 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2301 for (int index = cp->length() - 1; index >= 0; index--) {
2302 constantTag tag = cp->tag_at(index);
2303 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2304 }
2305 }
2306 JVM_END
2307
2308
2309 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2310 Klass* k = get_klass_considering_redefinition(cls, thread);
2311 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2312 JVM_END
2313
2314
2315 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2316 Klass* k = get_klass_considering_redefinition(cls, thread);
2317 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2318 JVM_END
2319
2320
2321 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2322 Klass* k = get_klass_considering_redefinition(cls, thread);
2323 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2324 JVM_END
2325
2326
2327 // The following methods, used for the verifier, are never called with
2328 // array klasses, so a direct cast to InstanceKlass is safe.
2329 // Typically, these methods are called in a loop with bounds determined
2330 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2331 // zero for arrays.
2332 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2333 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2334 Method* method = ik->methods()->at(method_index);
2335 int length = method->checked_exceptions_length();
2336 if (length > 0) {
2337 CheckedExceptionElement* table= method->checked_exceptions_start();
2338 for (int i = 0; i < length; i++) {
2339 exceptions[i] = table[i].class_cp_index;
2340 }
2341 }
2342 JVM_END
2343
2344
2345 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2346 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2347 Method* method = ik->methods()->at(method_index);
2348 return method->checked_exceptions_length();
2349 JVM_END
2350
2351
2352 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2353 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2354 Method* method = ik->methods()->at(method_index);
2355 memcpy(code, method->code_base(), method->code_size());
2356 JVM_END
2357
2358
2359 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2360 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2361 Method* method = ik->methods()->at(method_index);
2362 return method->code_size();
2363 JVM_END
2364
2365
2366 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2367 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2368 Method* method = ik->methods()->at(method_index);
2369 ExceptionTable extable(method);
2370 entry->start_pc = extable.start_pc(entry_index);
2371 entry->end_pc = extable.end_pc(entry_index);
2372 entry->handler_pc = extable.handler_pc(entry_index);
2373 entry->catchType = extable.catch_type_index(entry_index);
2374 JVM_END
2375
2376
2377 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2378 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2379 Method* method = ik->methods()->at(method_index);
2380 return method->exception_table_length();
2381 JVM_END
2382
2383
2384 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2385 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2386 Method* method = ik->methods()->at(method_index);
2387 return method->access_flags().as_method_flags();
2388 JVM_END
2389
2390
2391 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2392 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2393 return ik->field_access_flags(field_index);
2394 JVM_END
2395
2396
2397 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2398 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2399 Method* method = ik->methods()->at(method_index);
2400 return method->max_locals();
2401 JVM_END
2402
2403
2404 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2405 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2406 Method* method = ik->methods()->at(method_index);
2407 return method->size_of_parameters();
2408 JVM_END
2409
2410
2411 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2412 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2413 Method* method = ik->methods()->at(method_index);
2414 return method->verifier_max_stack();
2415 JVM_END
2416
2417
2418 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2419 ResourceMark rm(THREAD);
2420 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2421 Method* method = ik->methods()->at(method_index);
2422 return method->name() == vmSymbols::object_initializer_name();
2423 JVM_END
2424
2425
2426 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2427 ResourceMark rm(THREAD);
2428 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2429 Method* method = ik->methods()->at(method_index);
2430 return method->is_overpass();
2431 JVM_END
2432
2433 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2434 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2435 Method* method = ik->methods()->at(method_index);
2436 return method->name()->as_utf8();
2437 JVM_END
2438
2439
2440 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2441 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2442 Method* method = ik->methods()->at(method_index);
2443 return method->signature()->as_utf8();
2444 JVM_END
2445
2446 /**
2447 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2448 * read entries in the constant pool. Since the old verifier always
2449 * works on a copy of the code, it will not see any rewriting that
2450 * may possibly occur in the middle of verification. So it is important
2451 * that nothing it calls tries to use the cpCache instead of the raw
2452 * constant pool, so we must use cp->uncached_x methods when appropriate.
2453 */
2454 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2455 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2456 ConstantPool* cp = ik->constants();
2457 switch (cp->tag_at(cp_index).value()) {
2458 case JVM_CONSTANT_Fieldref:
2459 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2460 default:
2461 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2462 }
2463 ShouldNotReachHere();
2464 return nullptr;
2465 JVM_END
2466
2467
2468 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2469 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2470 ConstantPool* cp = ik->constants();
2471 switch (cp->tag_at(cp_index).value()) {
2472 case JVM_CONSTANT_InterfaceMethodref:
2473 case JVM_CONSTANT_Methodref:
2474 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2475 default:
2476 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2477 }
2478 ShouldNotReachHere();
2479 return nullptr;
2480 JVM_END
2481
2482
2483 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2484 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2485 ConstantPool* cp = ik->constants();
2486 switch (cp->tag_at(cp_index).value()) {
2487 case JVM_CONSTANT_InterfaceMethodref:
2488 case JVM_CONSTANT_Methodref:
2489 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2490 default:
2491 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2492 }
2493 ShouldNotReachHere();
2494 return nullptr;
2495 JVM_END
2496
2497
2498 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2499 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2500 ConstantPool* cp = ik->constants();
2501 switch (cp->tag_at(cp_index).value()) {
2502 case JVM_CONSTANT_Fieldref:
2503 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2504 default:
2505 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2506 }
2507 ShouldNotReachHere();
2508 return nullptr;
2509 JVM_END
2510
2511
2512 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2513 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2514 ConstantPool* cp = ik->constants();
2515 Symbol* classname = cp->klass_name_at(cp_index);
2516 return classname->as_utf8();
2517 JVM_END
2518
2519
2520 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2521 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2522 ConstantPool* cp = ik->constants();
2523 switch (cp->tag_at(cp_index).value()) {
2524 case JVM_CONSTANT_Fieldref: {
2525 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2526 Symbol* classname = cp->klass_name_at(class_index);
2527 return classname->as_utf8();
2528 }
2529 default:
2530 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2531 }
2532 ShouldNotReachHere();
2533 return nullptr;
2534 JVM_END
2535
2536
2537 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2538 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2539 ConstantPool* cp = ik->constants();
2540 switch (cp->tag_at(cp_index).value()) {
2541 case JVM_CONSTANT_Methodref:
2542 case JVM_CONSTANT_InterfaceMethodref: {
2543 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2544 Symbol* classname = cp->klass_name_at(class_index);
2545 return classname->as_utf8();
2546 }
2547 default:
2548 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2549 }
2550 ShouldNotReachHere();
2551 return nullptr;
2552 JVM_END
2553
2554
2555 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2556 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2557 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2558 ConstantPool* cp = ik->constants();
2559 ConstantPool* cp_called = ik_called->constants();
2560 switch (cp->tag_at(cp_index).value()) {
2561 case JVM_CONSTANT_Fieldref: {
2562 Symbol* name = cp->uncached_name_ref_at(cp_index);
2563 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2564 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2565 if (fs.name() == name && fs.signature() == signature) {
2566 return fs.access_flags().as_field_flags();
2567 }
2568 }
2569 return -1;
2570 }
2571 default:
2572 fatal("JVM_GetCPFieldModifiers: illegal constant");
2573 }
2574 ShouldNotReachHere();
2575 return 0;
2576 JVM_END
2577
2578
2579 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2580 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2581 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2582 ConstantPool* cp = ik->constants();
2583 switch (cp->tag_at(cp_index).value()) {
2584 case JVM_CONSTANT_Methodref:
2585 case JVM_CONSTANT_InterfaceMethodref: {
2586 Symbol* name = cp->uncached_name_ref_at(cp_index);
2587 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2588 Array<Method*>* methods = ik_called->methods();
2589 int methods_count = methods->length();
2590 for (int i = 0; i < methods_count; i++) {
2591 Method* method = methods->at(i);
2592 if (method->name() == name && method->signature() == signature) {
2593 return method->access_flags().as_method_flags();
2594 }
2595 }
2596 return -1;
2597 }
2598 default:
2599 fatal("JVM_GetCPMethodModifiers: illegal constant");
2600 }
2601 ShouldNotReachHere();
2602 return 0;
2603 JVM_END
2604
2605
2606 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2607
2608 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2609 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2610 JVM_END
2611
2612
2613 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2614 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2615 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2616 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2617 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2618 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2619 JVM_END
2620
2621 // Printing support //////////////////////////////////////////////////
2622 extern "C" {
2623
2624 ATTRIBUTE_PRINTF(3, 0)
2625 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2626 // Reject count values that are negative signed values converted to
2627 // unsigned; see bug 4399518, 4417214
2628 if ((intptr_t)count <= 0) return -1;
2629
2630 int result = os::vsnprintf(str, count, fmt, args);
2631 if (result > 0 && (size_t)result >= count) {
2632 result = -1;
2633 }
2634
2635 return result;
2636 }
2637
2638 ATTRIBUTE_PRINTF(3, 4)
2639 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2640 va_list args;
2641 int len;
2642 va_start(args, fmt);
2643 len = jio_vsnprintf(str, count, fmt, args);
2644 va_end(args);
2645 return len;
2646 }
2647
2648 ATTRIBUTE_PRINTF(2, 3)
2649 int jio_fprintf(FILE* f, const char *fmt, ...) {
2650 int len;
2651 va_list args;
2652 va_start(args, fmt);
2653 len = jio_vfprintf(f, fmt, args);
2654 va_end(args);
2655 return len;
2656 }
2657
2658 ATTRIBUTE_PRINTF(2, 0)
2659 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2660 if (Arguments::vfprintf_hook() != nullptr) {
2661 return Arguments::vfprintf_hook()(f, fmt, args);
2662 } else {
2663 return vfprintf(f, fmt, args);
2664 }
2665 }
2666
2667 ATTRIBUTE_PRINTF(1, 2)
2668 JNIEXPORT int jio_printf(const char *fmt, ...) {
2669 int len;
2670 va_list args;
2671 va_start(args, fmt);
2672 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2673 va_end(args);
2674 return len;
2675 }
2676
2677 // HotSpot specific jio method
2678 void jio_print(const char* s, size_t len) {
2679 // Try to make this function as atomic as possible.
2680 if (Arguments::vfprintf_hook() != nullptr) {
2681 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2682 } else {
2683 // Make an unused local variable to avoid warning from gcc compiler.
2684 bool dummy = os::write(defaultStream::output_fd(), s, len);
2685 }
2686 }
2687
2688 } // Extern C
2689
2690 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2691
2692 // In most of the JVM thread support functions we need to access the
2693 // thread through a ThreadsListHandle to prevent it from exiting and
2694 // being reclaimed while we try to operate on it. The exceptions to this
2695 // rule are when operating on the current thread, or if the monitor of
2696 // the target java.lang.Thread is locked at the Java level - in both
2697 // cases the target cannot exit.
2698
2699 static void thread_entry(JavaThread* thread, TRAPS) {
2700 HandleMark hm(THREAD);
2701 Handle obj(THREAD, thread->threadObj());
2702 JavaValue result(T_VOID);
2703 JavaCalls::call_virtual(&result,
2704 obj,
2705 vmClasses::Thread_klass(),
2706 vmSymbols::run_method_name(),
2707 vmSymbols::void_method_signature(),
2708 THREAD);
2709 }
2710
2711
2712 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2713 #if INCLUDE_CDS
2714 if (CDSConfig::allow_only_single_java_thread()) {
2715 // During java -Xshare:dump, if we allow multiple Java threads to
2716 // execute in parallel, symbols and classes may be loaded in
2717 // random orders which will make the resulting CDS archive
2718 // non-deterministic.
2719 //
2720 // Lucikly, during java -Xshare:dump, it's important to run only
2721 // the code in the main Java thread (which is NOT started here) that
2722 // creates the module graph, etc. It's safe to not start the other
2723 // threads which are launched by class static initializers
2724 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2725 if (log_is_enabled(Info, aot)) {
2726 ResourceMark rm;
2727 oop t = JNIHandles::resolve_non_null(jthread);
2728 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2729 }
2730 return;
2731 }
2732 #endif
2733 JavaThread *native_thread = nullptr;
2734
2735 // We cannot hold the Threads_lock when we throw an exception,
2736 // due to rank ordering issues. Example: we might need to grab the
2737 // Heap_lock while we construct the exception.
2738 bool throw_illegal_thread_state = false;
2739
2740 // We must release the Threads_lock before we can post a jvmti event
2741 // in Thread::start.
2742 {
2743 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2744 // Ensure that the C++ Thread and OSThread structures aren't freed before
2745 // we operate.
2746 MutexLocker ml(Threads_lock);
2747
2748 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2749 // re-starting an already started thread, so we should usually find
2750 // that the JavaThread is null. However for a JNI attached thread
2751 // there is a small window between the Thread object being created
2752 // (with its JavaThread set) and the update to its threadStatus, so we
2753 // have to check for this
2754 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2755 throw_illegal_thread_state = true;
2756 } else {
2757 jlong size =
2758 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2759 // Allocate the C++ Thread structure and create the native thread. The
2760 // stack size retrieved from java is 64-bit signed, but the constructor takes
2761 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2762 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2763 // - Avoid passing negative values which would result in really large stacks.
2764 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2765 size_t sz = size > 0 ? (size_t) size : 0;
2766 native_thread = new JavaThread(&thread_entry, sz);
2767
2768 // At this point it may be possible that no osthread was created for the
2769 // JavaThread due to lack of memory. Check for this situation and throw
2770 // an exception if necessary. Eventually we may want to change this so
2771 // that we only grab the lock if the thread was created successfully -
2772 // then we can also do this check and throw the exception in the
2773 // JavaThread constructor.
2774 if (native_thread->osthread() != nullptr) {
2775 // Note: the current thread is not being used within "prepare".
2776 native_thread->prepare(jthread);
2777 }
2778 }
2779 }
2780
2781 if (throw_illegal_thread_state) {
2782 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2783 }
2784
2785 assert(native_thread != nullptr, "Starting null thread?");
2786
2787 if (native_thread->osthread() == nullptr) {
2788 ResourceMark rm(thread);
2789 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2790 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2791 // No one should hold a reference to the 'native_thread'.
2792 native_thread->smr_delete();
2793 if (JvmtiExport::should_post_resource_exhausted()) {
2794 JvmtiExport::post_resource_exhausted(
2795 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2796 os::native_thread_creation_failed_msg());
2797 }
2798 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2799 os::native_thread_creation_failed_msg());
2800 }
2801
2802 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2803
2804 Thread::start(native_thread);
2805
2806 JVM_END
2807
2808
2809 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2810 ThreadsListHandle tlh(thread);
2811 oop java_thread = nullptr;
2812 JavaThread* receiver = nullptr;
2813 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2814 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2815
2816 if (is_alive) {
2817 // jthread refers to a live JavaThread.
2818 Thread::set_priority(receiver, (ThreadPriority)prio);
2819 }
2820 // Implied else: If the JavaThread hasn't started yet, then the
2821 // priority set in the java.lang.Thread object above will be pushed
2822 // down when it does start.
2823 JVM_END
2824
2825
2826 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2827 HOTSPOT_THREAD_YIELD();
2828 os::naked_yield();
2829 JVM_END
2830
2831 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2832 if (nanos < 0) {
2833 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2834 }
2835
2836 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2837 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2838 }
2839
2840 // Save current thread state and restore it at the end of this block.
2841 // And set new thread state to SLEEPING.
2842 JavaThreadSleepState jtss(thread);
2843
2844 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
2845
2846 if (nanos == 0) {
2847 os::naked_yield();
2848 } else {
2849 ThreadState old_state = thread->osthread()->get_state();
2850 thread->osthread()->set_state(SLEEPING);
2851 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
2852 // An asynchronous exception could have been thrown on
2853 // us while we were sleeping. We do not overwrite those.
2854 if (!HAS_PENDING_EXCEPTION) {
2855 HOTSPOT_THREAD_SLEEP_END(1);
2856 if (!thread->has_async_exception_condition()) {
2857 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2858 // to properly restore the thread state. That's likely wrong.
2859 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2860 }
2861 }
2862 }
2863 thread->osthread()->set_state(old_state);
2864 }
2865 HOTSPOT_THREAD_SLEEP_END(0);
2866 JVM_END
2867
2868 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
2869 oop jthread = thread->threadObj();
2870 assert(jthread != nullptr, "no current carrier thread!");
2871 return JNIHandles::make_local(THREAD, jthread);
2872 JVM_END
2873
2874 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2875 oop theThread = thread->vthread();
2876 assert(theThread != (oop)nullptr, "no current thread!");
2877 return JNIHandles::make_local(THREAD, theThread);
2878 JVM_END
2879
2880 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
2881 jobject theThread))
2882 oop threadObj = JNIHandles::resolve(theThread);
2883 thread->set_vthread(threadObj);
2884
2885 // Set _monitor_owner_id of new current Thread
2886 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
2887
2888 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
2889 JVM_END
2890
2891 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
2892 return ThreadIdentifier::unsafe_offset();
2893 JVM_END
2894
2895 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2896 ThreadsListHandle tlh(thread);
2897 JavaThread* receiver = nullptr;
2898 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
2899 if (is_alive) {
2900 // jthread refers to a live JavaThread.
2901 receiver->interrupt();
2902 }
2903 JVM_END
2904
2905 // Return true iff the current thread has locked the object passed in
2906
2907 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
2908 if (obj == nullptr) {
2909 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
2910 }
2911 Handle h_obj(THREAD, JNIHandles::resolve(obj));
2912 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
2913 JVM_END
2914
2915 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
2916 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
2917 return JNIHandles::make_local(THREAD, trace);
2918 JVM_END
2919
2920 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
2921 #if INCLUDE_JVMTI
2922 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
2923 return JNIHandles::make_local(THREAD, snapshot);
2924 #else
2925 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
2926 #endif
2927 JVM_END
2928
2929 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
2930 // We don't use a ThreadsListHandle here because the current thread
2931 // must be alive.
2932 oop java_thread = JNIHandles::resolve_non_null(jthread);
2933 JavaThread* thr = java_lang_Thread::thread(java_thread);
2934 if (thread == thr && !thr->has_attached_via_jni()) {
2935 // Thread naming is only supported for the current thread and
2936 // we don't set the name of an attached thread to avoid stepping
2937 // on other programs.
2938 ResourceMark rm(thread);
2939 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2940 os::set_native_thread_name(thread_name);
2941 }
2942 JVM_END
2943
2944 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
2945 oop theCache = thread->scopedValueCache();
2946 return JNIHandles::make_local(THREAD, theCache);
2947 JVM_END
2948
2949 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
2950 jobject theCache))
2951 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
2952 thread->set_scopedValueCache(objs);
2953 JVM_END
2954
2955
2956 // java.lang.Package ////////////////////////////////////////////////////////////////
2957
2958
2959 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
2960 ResourceMark rm(THREAD);
2961 JvmtiVMObjectAllocEventCollector oam;
2962 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2963 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
2964 return (jstring) JNIHandles::make_local(THREAD, result);
2965 JVM_END
2966
2967
2968 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
2969 JvmtiVMObjectAllocEventCollector oam;
2970 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
2971 return (jobjectArray) JNIHandles::make_local(THREAD, result);
2972 JVM_END
2973
2974
2975 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
2976
2977
2978 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
2979 MonitorLocker ml(Heap_lock);
2980 oop ref = Universe::reference_pending_list();
2981 if (ref != nullptr) {
2982 Universe::clear_reference_pending_list();
2983 }
2984 return JNIHandles::make_local(THREAD, ref);
2985 JVM_END
2986
2987 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
2988 MonitorLocker ml(Heap_lock);
2989 return Universe::has_reference_pending_list();
2990 JVM_END
2991
2992 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
2993 MonitorLocker ml(Heap_lock);
2994 while (!Universe::has_reference_pending_list()) {
2995 ml.wait();
2996 }
2997 JVM_END
2998
2999 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3000 oop ref_oop = JNIHandles::resolve_non_null(ref);
3001 // PhantomReference has its own implementation of get().
3002 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3003 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3004 return JNIHandles::make_local(THREAD, referent);
3005 JVM_END
3006
3007 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3008 oop ref_oop = JNIHandles::resolve_non_null(ref);
3009 // PhantomReference has its own implementation of refersTo().
3010 // See: JVM_PhantomReferenceRefersTo
3011 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3012 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3013 return referent == JNIHandles::resolve(o);
3014 JVM_END
3015
3016 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3017 oop ref_oop = JNIHandles::resolve_non_null(ref);
3018 // FinalReference has it's own implementation of clear().
3019 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3020 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3021 // If the referent has already been cleared then done.
3022 // However, if the referent is dead but has not yet been cleared by
3023 // concurrent reference processing, it should NOT be cleared here.
3024 // Instead, clearing should be left to the GC. Clearing it here could
3025 // detectably lose an expected notification, which is impossible with
3026 // STW reference processing. The clearing in enqueue() doesn't have
3027 // this problem, since the enqueue covers the notification, but it's not
3028 // worth the effort to handle that case specially.
3029 return;
3030 }
3031 java_lang_ref_Reference::clear_referent(ref_oop);
3032 JVM_END
3033
3034
3035 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3036
3037
3038 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3039 oop ref_oop = JNIHandles::resolve_non_null(ref);
3040 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3041 return referent == JNIHandles::resolve(o);
3042 JVM_END
3043
3044
3045 // ObjectInputStream ///////////////////////////////////////////////////////////////
3046
3047 // Return the first user-defined class loader up the execution stack, or null
3048 // if only code from the bootstrap or platform class loader is on the stack.
3049
3050 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3051 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3052 InstanceKlass* ik = vfst.method()->method_holder();
3053 oop loader = ik->class_loader();
3054 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3055 return JNIHandles::make_local(THREAD, loader);
3056 }
3057 }
3058 return nullptr;
3059 JVM_END
3060
3061
3062 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3063
3064
3065 // resolve array handle and check arguments
3066 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3067 if (arr == nullptr) {
3068 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3069 }
3070 oop a = JNIHandles::resolve_non_null(arr);
3071 if (!a->is_array()) {
3072 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3073 } else if (type_array_only && !a->is_typeArray()) {
3074 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3075 }
3076 return arrayOop(a);
3077 }
3078
3079
3080 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3081 arrayOop a = check_array(env, arr, false, CHECK_0);
3082 return a->length();
3083 JVM_END
3084
3085
3086 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3087 JvmtiVMObjectAllocEventCollector oam;
3088 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3089 jvalue value;
3090 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3091 oop box = Reflection::box(&value, type, CHECK_NULL);
3092 return JNIHandles::make_local(THREAD, box);
3093 JVM_END
3094
3095
3096 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3097 jvalue value;
3098 value.i = 0; // to initialize value before getting used in CHECK
3099 arrayOop a = check_array(env, arr, true, CHECK_(value));
3100 assert(a->is_typeArray(), "just checking");
3101 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3102 BasicType wide_type = (BasicType) wCode;
3103 if (type != wide_type) {
3104 Reflection::widen(&value, type, wide_type, CHECK_(value));
3105 }
3106 return value;
3107 JVM_END
3108
3109
3110 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3111 arrayOop a = check_array(env, arr, false, CHECK);
3112 oop box = JNIHandles::resolve(val);
3113 jvalue value;
3114 value.i = 0; // to initialize value before getting used in CHECK
3115 BasicType value_type;
3116 if (a->is_objArray()) {
3117 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3118 value_type = Reflection::unbox_for_regular_object(box, &value);
3119 } else {
3120 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3121 }
3122 Reflection::array_set(&value, a, index, value_type, CHECK);
3123 JVM_END
3124
3125
3126 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3127 arrayOop a = check_array(env, arr, true, CHECK);
3128 assert(a->is_typeArray(), "just checking");
3129 BasicType value_type = (BasicType) vCode;
3130 Reflection::array_set(&v, a, index, value_type, CHECK);
3131 JVM_END
3132
3133
3134 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3135 JvmtiVMObjectAllocEventCollector oam;
3136 oop element_mirror = JNIHandles::resolve(eltClass);
3137 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3138 return JNIHandles::make_local(THREAD, result);
3139 JVM_END
3140
3141
3142 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3143 JvmtiVMObjectAllocEventCollector oam;
3144 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3145 oop element_mirror = JNIHandles::resolve(eltClass);
3146 assert(dim_array->is_typeArray(), "just checking");
3147 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3148 return JNIHandles::make_local(THREAD, result);
3149 JVM_END
3150
3151
3152 // Library support ///////////////////////////////////////////////////////////////////////////
3153
3154 JVM_LEAF(void*, JVM_LoadZipLibrary())
3155 return ZipLibrary::handle();
3156 JVM_END
3157
3158 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3159 //%note jvm_ct
3160 char ebuf[1024];
3161 void *load_result;
3162 {
3163 ThreadToNativeFromVM ttnfvm(thread);
3164 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3165 }
3166 if (load_result == nullptr) {
3167 if (throwException) {
3168 char msg[1024];
3169 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3170 // Since 'ebuf' may contain a string encoded using
3171 // platform encoding scheme, we need to pass
3172 // Exceptions::unsafe_to_utf8 to the new_exception method
3173 // as the last argument. See bug 6367357.
3174 Handle h_exception =
3175 Exceptions::new_exception(thread,
3176 vmSymbols::java_lang_UnsatisfiedLinkError(),
3177 msg, Exceptions::unsafe_to_utf8);
3178
3179 THROW_HANDLE_NULL(h_exception);
3180 } else {
3181 log_info(library)("Failed to load library %s", name);
3182 return load_result;
3183 }
3184 }
3185 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3186 return load_result;
3187 JVM_END
3188
3189
3190 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3191 os::dll_unload(handle);
3192 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3193 JVM_END
3194
3195
3196 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3197 void* find_result = os::dll_lookup(handle, name);
3198 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3199 find_result != nullptr ? "Found" : "Failed to find",
3200 name, p2i(handle));
3201 return find_result;
3202 JVM_END
3203
3204
3205 // JNI version ///////////////////////////////////////////////////////////////////////////////
3206
3207 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3208 return Threads::is_supported_jni_version_including_1_1(version);
3209 JVM_END
3210
3211
3212 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3213 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3214 JVM_END
3215
3216 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3217 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3218 JVM_END
3219
3220 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3221 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3222 JVM_END
3223
3224 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3225 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3226 JVM_END
3227
3228 // String support ///////////////////////////////////////////////////////////////////////////
3229
3230 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3231 JvmtiVMObjectAllocEventCollector oam;
3232 if (str == nullptr) return nullptr;
3233 oop string = JNIHandles::resolve_non_null(str);
3234 oop result = StringTable::intern(string, CHECK_NULL);
3235 return (jstring) JNIHandles::make_local(THREAD, result);
3236 JVM_END
3237
3238
3239 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3240
3241 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3242 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3243 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3244 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3245 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3246 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3247
3248
3249 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3250 VM_Exit::block_if_vm_exited();
3251 return new PlatformMutex();
3252 }
3253
3254
3255 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3256 VM_Exit::block_if_vm_exited();
3257 delete ((PlatformMutex*) mon);
3258 }
3259
3260
3261 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3262 VM_Exit::block_if_vm_exited();
3263 ((PlatformMutex*) mon)->lock();
3264 return 0;
3265 }
3266
3267
3268 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3269 VM_Exit::block_if_vm_exited();
3270 ((PlatformMutex*) mon)->unlock();
3271 }
3272
3273
3274 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3275
3276 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3277 Handle loader, jboolean throwError, TRAPS) {
3278 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3279
3280 // Check if we should initialize the class
3281 if (init && klass->is_instance_klass()) {
3282 klass->initialize(CHECK_NULL);
3283 }
3284 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3285 }
3286
3287
3288 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3289
3290 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3291 Handle method_handle;
3292 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3293 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3294 Handle receiver(THREAD, JNIHandles::resolve(obj));
3295 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3296 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3297 jobject res = JNIHandles::make_local(THREAD, result);
3298 if (JvmtiExport::should_post_vm_object_alloc()) {
3299 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3300 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3301 if (java_lang_Class::is_primitive(ret_type)) {
3302 // Only for primitive type vm allocates memory for java object.
3303 // See box() method.
3304 JvmtiExport::post_vm_object_alloc(thread, result);
3305 }
3306 }
3307 return res;
3308 } else {
3309 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3310 }
3311 JVM_END
3312
3313
3314 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3315 oop constructor_mirror = JNIHandles::resolve(c);
3316 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3317 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3318 jobject res = JNIHandles::make_local(THREAD, result);
3319 if (JvmtiExport::should_post_vm_object_alloc()) {
3320 JvmtiExport::post_vm_object_alloc(thread, result);
3321 }
3322 return res;
3323 JVM_END
3324
3325 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3326 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3327 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3328 JVM_END
3329
3330 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3331 jclass caller,
3332 jstring interfaceMethodName,
3333 jobject factoryType,
3334 jobject interfaceMethodType,
3335 jobject implementationMember,
3336 jobject dynamicMethodType,
3337 jclass lambdaProxyClass))
3338 #if INCLUDE_CDS
3339 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3340 return;
3341 }
3342
3343 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3344 if (caller_ik->is_hidden()) {
3345 // Hidden classes not of type lambda proxy classes are currently not being archived.
3346 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3347 // registered for archiving.
3348 return;
3349 }
3350 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3351 assert(lambda_ik->is_hidden(), "must be a hidden class");
3352 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3353
3354 Symbol* interface_method_name = nullptr;
3355 if (interfaceMethodName != nullptr) {
3356 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3357 }
3358 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3359 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3360
3361 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3362 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3363
3364 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3365 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3366 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3367
3368 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3369 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3370
3371 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3372 interface_method_type, m, dynamic_method_type, THREAD);
3373 #endif // INCLUDE_CDS
3374 JVM_END
3375
3376 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3377 jclass caller,
3378 jstring interfaceMethodName,
3379 jobject factoryType,
3380 jobject interfaceMethodType,
3381 jobject implementationMember,
3382 jobject dynamicMethodType))
3383 #if INCLUDE_CDS
3384
3385 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3386 implementationMember == nullptr || dynamicMethodType == nullptr) {
3387 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3388 }
3389
3390 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3391 if (!caller_ik->in_aot_cache()) {
3392 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3393 return nullptr;
3394 }
3395
3396 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3397 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3398 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3399
3400 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3401 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3402
3403 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3404 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3405 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3406
3407 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3408 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3409
3410 InstanceKlass* loaded_lambda =
3411 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3412 interface_method_type, m, dynamic_method_type,
3413 CHECK_(nullptr));
3414 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3415 #else
3416 return nullptr;
3417 #endif // INCLUDE_CDS
3418 JVM_END
3419
3420 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3421 if (CDSConfig::is_dumping_static_archive()) {
3422 // We do this so that the default CDS archive can be deterministic.
3423 const char* release = VM_Version::vm_release();
3424 const char* dbg_level = VM_Version::jdk_debug_level();
3425 const char* version = VM_Version::internal_vm_info_string();
3426 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3427 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3428 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3429 seed += (jlong)VM_Version::vm_major_version();
3430 seed += (jlong)VM_Version::vm_minor_version();
3431 seed += (jlong)VM_Version::vm_security_version();
3432 seed += (jlong)VM_Version::vm_patch_version();
3433 if (seed == 0) { // don't let this ever be zero.
3434 seed = 0x87654321;
3435 }
3436 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3437 return seed;
3438 } else {
3439 return 0;
3440 }
3441 JVM_END
3442
3443 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3444 return CDSConfig::get_status();
3445 JVM_END
3446
3447 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3448 #if INCLUDE_CDS
3449 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3450 if (line != nullptr) {
3451 ResourceMark rm(THREAD);
3452 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3453 char* c_line = java_lang_String::as_utf8_string(h_line());
3454 if (CDSConfig::is_dumping_dynamic_archive()) {
3455 // Note: LambdaFormInvokers::append take same format which is not
3456 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3457 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3458 }
3459 if (ClassListWriter::is_enabled()) {
3460 ClassListWriter w;
3461 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3462 }
3463 }
3464 #endif // INCLUDE_CDS
3465 JVM_END
3466
3467 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3468 #if INCLUDE_CDS
3469 ResourceMark rm(THREAD);
3470 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3471 char* file_name = java_lang_String::as_utf8_string(file_handle());
3472 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3473 #endif // INCLUDE_CDS
3474 JVM_END
3475
3476 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3477 #if INCLUDE_CDS
3478 ResourceMark rm(THREAD);
3479 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3480 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3481 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3482 #endif // INCLUDE_CDS
3483 JVM_END
3484
3485 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3486 #if INCLUDE_CDS
3487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3488 if (!k->is_instance_klass()) {
3489 return false;
3490 } else {
3491 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3492 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3493 // This class will be cached in AOT-initialized state. No need for init barriers.
3494 return false;
3495 } else {
3496 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3497 // must emit barriers to ensure class initialization during production run.
3498 ResourceMark rm(THREAD);
3499 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3500 return true;
3501 }
3502 }
3503 #else
3504 return false;
3505 #endif // INCLUDE_CDS
3506 JVM_END
3507
3508 // Returns an array of all live Thread objects (VM internal JavaThreads,
3509 // jvmti agent threads, and JNI attaching threads are skipped)
3510 // See CR 6404306 regarding JNI attaching threads
3511 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3512 ResourceMark rm(THREAD);
3513 ThreadsListEnumerator tle(THREAD, false, false);
3514 JvmtiVMObjectAllocEventCollector oam;
3515
3516 int num_threads = tle.num_threads();
3517 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3518 objArrayHandle threads_ah(THREAD, r);
3519
3520 for (int i = 0; i < num_threads; i++) {
3521 Handle h = tle.get_threadObj(i);
3522 threads_ah->obj_at_put(i, h());
3523 }
3524
3525 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3526 JVM_END
3527
3528
3529 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3530 // Return StackTraceElement[][], each element is the stack trace of a thread in
3531 // the corresponding entry in the given threads array
3532 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3533 JvmtiVMObjectAllocEventCollector oam;
3534
3535 // Check if threads is null
3536 if (threads == nullptr) {
3537 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3538 }
3539
3540 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3541 objArrayHandle ah(THREAD, a);
3542 int num_threads = ah->length();
3543 // check if threads is non-empty array
3544 if (num_threads == 0) {
3545 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3546 }
3547
3548 // check if threads is not an array of objects of Thread class
3549 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3550 if (k != vmClasses::Thread_klass()) {
3551 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3552 }
3553
3554 ResourceMark rm(THREAD);
3555
3556 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3557 for (int i = 0; i < num_threads; i++) {
3558 oop thread_obj = ah->obj_at(i);
3559 instanceHandle h(THREAD, (instanceOop) thread_obj);
3560 thread_handle_array->append(h);
3561 }
3562
3563 // The JavaThread references in thread_handle_array are validated
3564 // in VM_ThreadDump::doit().
3565 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3566 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3567
3568 JVM_END
3569
3570 // JVM monitoring and management support
3571 JVM_LEAF(void*, JVM_GetManagement(jint version))
3572 return Management::get_jmm_interface(version);
3573 JVM_END
3574
3575 // com.sun.tools.attach.VirtualMachine agent properties support
3576 //
3577 // Initialize the agent properties with the properties maintained in the VM
3578 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3579 ResourceMark rm;
3580
3581 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3582
3583 PUTPROP(props, "sun.java.command", Arguments::java_command());
3584 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3585 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3586 return properties;
3587 JVM_END
3588
3589 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3590 {
3591 JvmtiVMObjectAllocEventCollector oam;
3592
3593 if (ofClass == nullptr) {
3594 return nullptr;
3595 }
3596 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3597 // Special handling for primitive objects
3598 if (java_lang_Class::is_primitive(mirror())) {
3599 return nullptr;
3600 }
3601 Klass* k = java_lang_Class::as_Klass(mirror());
3602 if (!k->is_instance_klass()) {
3603 return nullptr;
3604 }
3605 InstanceKlass* ik = InstanceKlass::cast(k);
3606 int encl_method_class_idx = ik->enclosing_method_class_index();
3607 if (encl_method_class_idx == 0) {
3608 return nullptr;
3609 }
3610 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3611 objArrayHandle dest(THREAD, dest_o);
3612 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3613 dest->obj_at_put(0, enc_k->java_mirror());
3614 int encl_method_method_idx = ik->enclosing_method_method_index();
3615 if (encl_method_method_idx != 0) {
3616 Symbol* sym = ik->constants()->symbol_at(
3617 extract_low_short_from_int(
3618 ik->constants()->name_and_type_at(encl_method_method_idx)));
3619 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3620 dest->obj_at_put(1, str());
3621 sym = ik->constants()->symbol_at(
3622 extract_high_short_from_int(
3623 ik->constants()->name_and_type_at(encl_method_method_idx)));
3624 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3625 dest->obj_at_put(2, str());
3626 }
3627 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3628 }
3629 JVM_END
3630
3631 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3632 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3633 ResourceMark rm(THREAD);
3634
3635 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3636 return nullptr;
3637 }
3638
3639 char** vm_flags = Arguments::jvm_flags_array();
3640 char** vm_args = Arguments::jvm_args_array();
3641 int num_flags = Arguments::num_jvm_flags();
3642 int num_args = Arguments::num_jvm_args();
3643
3644 InstanceKlass* ik = vmClasses::String_klass();
3645 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3646 objArrayHandle result_h(THREAD, r);
3647
3648 int index = 0;
3649 for (int j = 0; j < num_flags; j++, index++) {
3650 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3651 result_h->obj_at_put(index, h());
3652 }
3653 for (int i = 0; i < num_args; i++, index++) {
3654 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3655 result_h->obj_at_put(index, h());
3656 }
3657 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3658 JVM_END
3659
3660 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3661 return os::get_signal_number(name);
3662 JVM_END
3663
3664 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3665 #if INCLUDE_JVMTI
3666 if (!DoJVMTIVirtualThreadTransitions) {
3667 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3668 return;
3669 }
3670 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3671 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3672 } else {
3673 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3674 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3675 }
3676 #endif
3677 JVM_END
3678
3679 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3680 #if INCLUDE_JVMTI
3681 if (!DoJVMTIVirtualThreadTransitions) {
3682 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3683 return;
3684 }
3685 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3686 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3687 } else {
3688 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3689 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3690 }
3691 #endif
3692 JVM_END
3693
3694 // If notifications are disabled then just update the VTMS transition bit and return.
3695 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3696 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3697 #if INCLUDE_JVMTI
3698 if (!DoJVMTIVirtualThreadTransitions) {
3699 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3700 return;
3701 }
3702 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3703 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3704 } else {
3705 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3706 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3707 }
3708 #endif
3709 JVM_END
3710
3711 // If notifications are disabled then just update the VTMS transition bit and return.
3712 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3713 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3714 #if INCLUDE_JVMTI
3715 if (!DoJVMTIVirtualThreadTransitions) {
3716 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3717 return;
3718 }
3719 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3720 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3721 } else {
3722 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3723 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3724 }
3725 #endif
3726 JVM_END
3727
3728 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3729 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3730 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3731 #if INCLUDE_JVMTI
3732 if (!DoJVMTIVirtualThreadTransitions) {
3733 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3734 return;
3735 }
3736 assert(thread->is_disable_suspend() != (bool)enter,
3737 "nested or unbalanced monitor enter/exit is not allowed");
3738 thread->toggle_is_disable_suspend();
3739 #endif
3740 JVM_END
3741
3742 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3743 #if INCLUDE_JFR
3744 freeze_result result = THREAD->last_freeze_fail_result();
3745 assert(result != freeze_ok, "sanity check");
3746 EventVirtualThreadPinned event(UNTIMED);
3747 event.set_starttime(THREAD->last_freeze_fail_time());
3748 if (event.should_commit()) {
3749 ResourceMark rm(THREAD);
3750 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3751 THREAD->post_vthread_pinned_event(&event, str, result);
3752 }
3753 #endif
3754 JVM_END
3755
3756 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3757 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3758 assert(parkEvent != nullptr, "not initialized");
3759
3760 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3761 oop vthread_head = nullptr;
3762 while (true) {
3763 if (list_head.peek() != nullptr) {
3764 for (;;) {
3765 oop head = list_head.resolve();
3766 if (list_head.cmpxchg(head, nullptr) == head) {
3767 return JNIHandles::make_local(THREAD, head);
3768 }
3769 }
3770 }
3771 ThreadBlockInVM tbivm(THREAD);
3772 parkEvent->park();
3773 }
3774 JVM_END
3775 /*
3776 * Return the current class's class file version. The low order 16 bits of the
3777 * returned jint contain the class's major version. The high order 16 bits
3778 * contain the class's minor version.
3779 */
3780 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3781 oop mirror = JNIHandles::resolve_non_null(current);
3782 if (java_lang_Class::is_primitive(mirror)) {
3783 // return latest major version and minor version of 0.
3784 return JVM_CLASSFILE_MAJOR_VERSION;
3785 }
3786 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3787 return (ik->minor_version() << 16) | ik->major_version();
3788 JVM_END
3789
3790 /*
3791 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3792 * get the value will see a materialized value and not a scalar-replaced
3793 * null value.
3794 */
3795 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3796 JVM_EnsureMaterializedForStackWalk(env, value);
3797 JVM_END
3798
3799 /*
3800 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3801 */
3802 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3803 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3804 JVM_END