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