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