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 #elif INCLUDE_JVMCI
392 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
393 #else
394 const char* compiler_name = "";
395 #endif // compilers
396 #endif // COMPILER1_AND_COMPILER2
397
398 if (*compiler_name != '\0' &&
399 (Arguments::mode() != Arguments::_int)) {
400 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
401 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
402 result_h->obj_at_put(ndx * 2, key_str());
403 result_h->obj_at_put(ndx * 2 + 1, value_str());
404 ndx++;
405 }
406 }
407
408 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
409 JVM_END
410
411
412 /*
413 * Return the temporary directory that the VM uses for the attach
414 * and perf data files.
415 *
416 * It is important that this directory is well-known and the
417 * same for all VM instances. It cannot be affected by configuration
418 * variables such as java.io.tmpdir.
419 */
420 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
421 HandleMark hm(THREAD);
422 const char* temp_dir = os::get_temp_directory();
423 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
424 return (jstring) JNIHandles::make_local(THREAD, h());
425 JVM_END
426
427
428 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
429
430 extern volatile jint vm_created;
431
432 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
433 EventShutdown event;
434 if (event.should_commit()) {
435 event.set_reason("Shutdown requested from Java");
436 event.commit();
437 }
438 JVM_END
439
440
441 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
442 before_exit(thread, true);
443 vm_exit(code);
444 JVM_END
445
446
447 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
448 if (!DisableExplicitGC) {
449 EventSystemGC event;
450 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
451 Universe::heap()->collect(GCCause::_java_lang_system_gc);
452 event.commit();
453 }
454 JVM_END
455
456
457 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
458 return Universe::heap()->millis_since_last_whole_heap_examined();
459 JVM_END
460
461
462 static inline jlong convert_size_t_to_jlong(size_t val) {
463 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
464 NOT_LP64 (return (jlong)val;)
465 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
466 }
467
468 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
469 size_t n = Universe::heap()->capacity();
470 return convert_size_t_to_jlong(n);
471 JVM_END
472
473
474 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
475 size_t n = Universe::heap()->unused();
476 return convert_size_t_to_jlong(n);
477 JVM_END
478
479
480 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
481 size_t n = Universe::heap()->max_capacity();
482 return convert_size_t_to_jlong(n);
483 JVM_END
484
485
486 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
487 return os::active_processor_count();
488 JVM_END
489
490 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
491 #ifdef LINUX
492 if (UseContainerSupport) {
493 return JNI_TRUE;
494 }
495 #endif
496 return JNI_FALSE;
497 JVM_END
498
499 JVM_LEAF(jboolean, JVM_IsContainerized(void))
500 if (os::is_containerized()) {
501 return JNI_TRUE;
502 }
503 return JNI_FALSE;
504 JVM_END
505
506 // java.lang.Throwable //////////////////////////////////////////////////////
507
508 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
509 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
510 java_lang_Throwable::fill_in_stack_trace(exception);
511 JVM_END
512
513 // java.lang.NullPointerException ///////////////////////////////////////////
514
515 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
516 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
517
518 oop exc = JNIHandles::resolve_non_null(throwable);
519
520 Method* method;
521 int bci;
522 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
523 return nullptr;
524 }
525 if (method->is_native()) {
526 return nullptr;
527 }
528
529 stringStream ss;
530 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
531 if (ok) {
532 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
533 return (jstring) JNIHandles::make_local(THREAD, result);
534 } else {
535 return nullptr;
536 }
537 JVM_END
538
539 // java.lang.StackTraceElement //////////////////////////////////////////////
540
541
542 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
543 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
544 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
545 objArrayHandle stack_trace(THREAD, st);
546 // Fill in the allocated stack trace
547 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
548 JVM_END
549
550
551 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
552 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
553 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
554 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
555 JVM_END
556
557
558 // java.lang.StackWalker //////////////////////////////////////////////////////
559 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
560 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
561
562 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
563 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
564 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
565 if (!have_name) {
566 oop name = StringTable::intern(method->name(), CHECK);
567 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
568 }
569 if (!have_type) {
570 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
571 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
572 }
573 JVM_END
574
575 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
576 jint skip_frames, jobject contScope, jobject cont,
577 jint buffer_size, jint start_index, jobjectArray frames))
578 if (!thread->has_last_Java_frame()) {
579 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
580 }
581
582 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
583 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
584 Handle cont_h(THREAD, JNIHandles::resolve(cont));
585 // frames array is a ClassFrameInfo[] array when only getting caller reference,
586 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
587 // be null.
588 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
589 objArrayHandle frames_array_h(THREAD, fa);
590
591 if (frames_array_h->length() < buffer_size) {
592 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
593 }
594
595 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
596 buffer_size, start_index, frames_array_h, CHECK_NULL);
597 return JNIHandles::make_local(THREAD, result);
598 JVM_END
599
600
601 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
602 jint last_batch_count, jint buffer_size, jint start_index,
603 jobjectArray frames))
604 // frames array is a ClassFrameInfo[] array when only getting caller reference,
605 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
606 // be null.
607 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
608 objArrayHandle frames_array_h(THREAD, fa);
609
610 if (frames_array_h->length() < buffer_size) {
611 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
612 }
613
614 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
615 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
616 start_index, frames_array_h, THREAD);
617 JVM_END
618
619 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
620 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
621 objArrayHandle frames_array_h(THREAD, fa);
622 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
623 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
624
625 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
626 JVM_END
627
628 // java.lang.Object ///////////////////////////////////////////////
629
630
631 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
632 // as implemented in the classic virtual machine; return 0 if object is null
633 return handle == nullptr ? 0 :
634 checked_cast<jint>(ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)));
635 JVM_END
636
637
638 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
639 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
640 ObjectSynchronizer::wait(obj, ms, CHECK);
641 JVM_END
642
643
644 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
645 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
646 ObjectSynchronizer::notify(obj, CHECK);
647 JVM_END
648
649
650 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
651 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
652 ObjectSynchronizer::notifyall(obj, CHECK);
653 JVM_END
654
655
656 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
657 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
658 Klass* klass = obj->klass();
659 JvmtiVMObjectAllocEventCollector oam;
660
661 #ifdef ASSERT
662 // Just checking that the cloneable flag is set correct
663 if (obj->is_array()) {
664 guarantee(klass->is_cloneable(), "all arrays are cloneable");
665 } else {
666 guarantee(obj->is_instance(), "should be instanceOop");
667 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
668 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
669 }
670 #endif
671
672 // Check if class of obj supports the Cloneable interface.
673 // All arrays are considered to be cloneable (See JLS 20.1.5).
674 // All j.l.r.Reference classes are considered non-cloneable.
675 if (!klass->is_cloneable() ||
676 (klass->is_instance_klass() &&
677 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
678 ResourceMark rm(THREAD);
679 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
680 }
681
682 // Make shallow object copy
683 const size_t size = obj->size();
684 oop new_obj_oop = nullptr;
685 if (obj->is_array()) {
686 const int length = ((arrayOop)obj())->length();
687 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
688 /* do_zero */ true, CHECK_NULL);
689 } else {
690 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
691 }
692
693 HeapAccess<>::clone(obj(), new_obj_oop, size);
694
695 Handle new_obj(THREAD, new_obj_oop);
696 // Caution: this involves a java upcall, so the clone should be
697 // "gc-robust" by this stage.
698 if (klass->has_finalizer()) {
699 assert(obj->is_instance(), "should be instanceOop");
700 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
701 new_obj = Handle(THREAD, new_obj_oop);
702 }
703
704 return JNIHandles::make_local(THREAD, new_obj());
705 JVM_END
706
707 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
708
709 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
710 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
711 JVM_END
712
713 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
714 return InstanceKlass::is_finalization_enabled();
715 JVM_END
716
717 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
718
719 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
720 CONT_RegisterNativeMethods(env, cls);
721 JVM_END
722
723 // java.io.File ///////////////////////////////////////////////////////////////
724
725 JVM_LEAF(char*, JVM_NativePath(char* path))
726 return os::native_path(path);
727 JVM_END
728
729
730 // Misc. class handling ///////////////////////////////////////////////////////////
731
732
733 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
734 // Getting the class of the caller frame.
735 //
736 // The call stack at this point looks something like this:
737 //
738 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
739 // [1] [ @CallerSensitive API.method ]
740 // [.] [ (skipped intermediate frames) ]
741 // [n] [ caller ]
742 vframeStream vfst(thread);
743 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
744 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
745 Method* m = vfst.method();
746 assert(m != nullptr, "sanity");
747 switch (n) {
748 case 0:
749 // This must only be called from Reflection.getCallerClass
750 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
751 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
752 }
753 // fall-through
754 case 1:
755 // Frame 0 and 1 must be caller sensitive.
756 if (!m->caller_sensitive()) {
757 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
758 }
759 break;
760 default:
761 if (!m->is_ignored_by_security_stack_walk()) {
762 // We have reached the desired frame; return the holder class.
763 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
764 }
765 break;
766 }
767 }
768 return nullptr;
769 JVM_END
770
771
772 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
773 oop mirror = nullptr;
774 BasicType t = name2type(utf);
775 if (t != T_ILLEGAL && !is_reference_type(t)) {
776 mirror = Universe::java_mirror(t);
777 }
778 if (mirror == nullptr) {
779 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
780 } else {
781 return (jclass) JNIHandles::make_local(THREAD, mirror);
782 }
783 JVM_END
784
785
786 // Returns a class loaded by the bootstrap class loader; or null
787 // if not found. ClassNotFoundException is not thrown.
788 // FindClassFromBootLoader is exported to the launcher for windows.
789 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
790 const char* name))
791 // Java libraries should ensure that name is never null or illegal.
792 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
793 // It's impossible to create this class; the name cannot fit
794 // into the constant pool.
795 return nullptr;
796 }
797 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
798
799 TempNewSymbol h_name = SymbolTable::new_symbol(name);
800 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
801 if (k == nullptr) {
802 return nullptr;
803 }
804
805 if (log_is_enabled(Debug, class, resolve)) {
806 trace_class_resolution(k);
807 }
808 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
809 JVM_END
810
811 // Find a class with this name in this loader.
812 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
813 jboolean init, jobject loader))
814 TempNewSymbol h_name =
815 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
816 CHECK_NULL);
817
818 oop loader_oop = JNIHandles::resolve(loader);
819 Handle h_loader(THREAD, loader_oop);
820
821 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
822 false, THREAD);
823
824 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
825 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
826 }
827 return result;
828 JVM_END
829
830 // Currently only called from the old verifier.
831 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
832 jboolean init, jclass from))
833 TempNewSymbol h_name =
834 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
835 CHECK_NULL);
836 oop from_class_oop = JNIHandles::resolve(from);
837 assert(from_class_oop != nullptr, "must be");
838 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
839 assert(from_class != nullptr, "must be");
840 oop class_loader = from_class->class_loader();
841
842 Handle h_loader(THREAD, class_loader);
843 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
844
845 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
846 // this function is generally only used for class loading during verification.
847 ResourceMark rm;
848 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
849 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
850 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
851 }
852
853 #if INCLUDE_CDS
854 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
855 InstanceKlass* ik = InstanceKlass::cast(from_class);
856 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
857 }
858 #endif
859
860 return result;
861 JVM_END
862
863 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
864 static jclass jvm_define_class_common(const char *name,
865 jobject loader, const jbyte *buf,
866 jsize len, jobject pd, const char *source,
867 TRAPS) {
868 if (source == nullptr) source = "__JVM_DefineClass__";
869
870 JavaThread* jt = THREAD;
871
872 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
873 ClassLoader::perf_define_appclass_selftime(),
874 ClassLoader::perf_define_appclasses(),
875 jt->get_thread_stat()->perf_recursion_counts_addr(),
876 jt->get_thread_stat()->perf_timers_addr(),
877 PerfClassTraceTime::DEFINE_CLASS);
878
879 if (UsePerfData) {
880 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
881 }
882
883 // Class resolution will get the class name from the .class stream if the name is null.
884 TempNewSymbol class_name = name == nullptr ? nullptr :
885 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
886 CHECK_NULL);
887
888 ResourceMark rm(THREAD);
889 ClassFileStream st((u1*)buf, len, source);
890 Handle class_loader (THREAD, JNIHandles::resolve(loader));
891 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
892 ClassLoadInfo cl_info(protection_domain);
893 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
894 class_loader,
895 cl_info,
896 CHECK_NULL);
897
898 if (log_is_enabled(Debug, class, resolve)) {
899 trace_class_resolution(k);
900 }
901
902 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
903 }
904
905 enum {
906 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
907 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
908 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
909 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
910 };
911
912 /*
913 * Define a class with the specified flags that indicates if it's a nestmate,
914 * hidden, or strongly referenced from class loader.
915 */
916 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
917 const jbyte *buf, jsize len, jobject pd,
918 jboolean init, int flags, jobject classData, TRAPS) {
919 ResourceMark rm(THREAD);
920
921 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
922 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
923 if (lookup_k == nullptr) {
924 // The error message is wrong. We come here only if lookup is a primitive class
925 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
926 }
927
928 Handle class_loader (THREAD, lookup_k->class_loader());
929
930 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
931 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
932 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
933 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
934
935 InstanceKlass* host_class = nullptr;
936 if (is_nestmate) {
937 host_class = lookup_k->nest_host(CHECK_NULL);
938 }
939
940 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
941 name,
942 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
943 is_nestmate ? host_class->external_name() : "",
944 is_hidden ? "hidden" : "not hidden",
945 is_strong ? "strong" : "weak",
946 vm_annotations ? "with vm annotations" : "without vm annotation");
947
948 if (!is_hidden) {
949 // classData is only applicable for hidden classes
950 if (classData != nullptr) {
951 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
952 }
953 if (is_nestmate) {
954 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
955 }
956 if (!is_strong) {
957 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
958 }
959 if (vm_annotations) {
960 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
961 }
962 if (flags != STRONG_LOADER_LINK) {
963 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
964 err_msg("invalid flag 0x%x", flags));
965 }
966 }
967
968 // Class resolution will get the class name from the .class stream if the name is null.
969 TempNewSymbol class_name = name == nullptr ? nullptr :
970 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
971 CHECK_NULL);
972
973 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
974 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
975 ClassFileStream st((u1*)buf, len, source);
976
977 InstanceKlass* ik = nullptr;
978 if (!is_hidden) {
979 ClassLoadInfo cl_info(protection_domain);
980 ik = SystemDictionary::resolve_from_stream(&st, class_name,
981 class_loader,
982 cl_info,
983 CHECK_NULL);
984
985 if (log_is_enabled(Debug, class, resolve)) {
986 trace_class_resolution(ik);
987 }
988 } else { // hidden
989 Handle classData_h(THREAD, JNIHandles::resolve(classData));
990 ClassLoadInfo cl_info(protection_domain,
991 host_class,
992 classData_h,
993 is_hidden,
994 is_strong,
995 vm_annotations);
996 ik = SystemDictionary::resolve_from_stream(&st, class_name,
997 class_loader,
998 cl_info,
999 CHECK_NULL);
1000
1001 // The hidden class loader data has been artificially been kept alive to
1002 // this point. The mirror and any instances of this class have to keep
1003 // it alive afterwards.
1004 ik->class_loader_data()->dec_keep_alive_ref_count();
1005
1006 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1007 ModuleEntry* module = ik->module();
1008 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1009 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1010 module_name,
1011 ik->external_name(),
1012 host_class->external_name(),
1013 ik->is_hidden() ? "is hidden" : "is not hidden");
1014 }
1015 }
1016
1017 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1018 // non-hidden class or nestmate class must be in the same package as the Lookup class
1019 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1020 }
1021
1022 if (init) {
1023 ik->initialize(CHECK_NULL);
1024 } else {
1025 ik->link_class(CHECK_NULL);
1026 }
1027
1028 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1029 }
1030
1031 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1032 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1033 JVM_END
1034
1035 /*
1036 * Define a class with the specified lookup class.
1037 * lookup: Lookup class
1038 * name: the name of the class
1039 * buf: class bytes
1040 * len: length of class bytes
1041 * pd: protection domain
1042 * init: initialize the class
1043 * flags: properties of the class
1044 * classData: private static pre-initialized field
1045 */
1046 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1047 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1048
1049 if (lookup == nullptr) {
1050 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1051 }
1052
1053 assert(buf != nullptr, "buf must not be null");
1054
1055 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1056 JVM_END
1057
1058 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1059
1060 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1061 JVM_END
1062
1063 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1064 ResourceMark rm(THREAD);
1065
1066 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1067 char* str = java_lang_String::as_utf8_string(h_name());
1068
1069 // Sanity check, don't expect null
1070 if (str == nullptr) return nullptr;
1071
1072 // Internalize the string, converting '.' to '/' in string.
1073 char* p = (char*)str;
1074 while (*p != '\0') {
1075 if (*p == '.') {
1076 *p = '/';
1077 }
1078 p++;
1079 }
1080
1081 const int str_len = (int)(p - str);
1082 if (str_len > Symbol::max_length()) {
1083 // It's impossible to create this class; the name cannot fit
1084 // into the constant pool.
1085 return nullptr;
1086 }
1087 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1088
1089 // Security Note:
1090 // The Java level wrapper will perform the necessary security check allowing
1091 // us to pass the null as the initiating class loader.
1092 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1093 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1094 #if INCLUDE_CDS
1095 if (k == nullptr) {
1096 // If the class is not already loaded, try to see if it's in the shared
1097 // archive for the current classloader (h_loader).
1098 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1099 }
1100 #endif
1101 return (k == nullptr) ? nullptr :
1102 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1103 JVM_END
1104
1105 // Module support //////////////////////////////////////////////////////////////////////////////
1106
1107 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1108 jstring location, jobjectArray packages))
1109 Handle h_module (THREAD, JNIHandles::resolve(module));
1110 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1111 JVM_END
1112
1113 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1114 Handle h_module (THREAD, JNIHandles::resolve(module));
1115 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1116 JVM_END
1117
1118 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1119 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1120 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1121 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1122 JVM_END
1123
1124 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1125 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1126 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1127 JVM_END
1128
1129 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1130 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1131 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1132 JVM_END
1133
1134 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1135 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1136 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1137 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1138 JVM_END
1139
1140 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1141 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1142 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1143 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1144 JVM_END
1145
1146 // Reflection support //////////////////////////////////////////////////////////////////////////////
1147
1148 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1149 assert (cls != nullptr, "illegal class");
1150 JvmtiVMObjectAllocEventCollector oam;
1151 ResourceMark rm(THREAD);
1152 HandleMark hm(THREAD);
1153 Handle java_class(THREAD, JNIHandles::resolve(cls));
1154 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1155 return (jstring) JNIHandles::make_local(THREAD, result);
1156 JVM_END
1157
1158
1159 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1160 JvmtiVMObjectAllocEventCollector oam;
1161 oop mirror = JNIHandles::resolve_non_null(cls);
1162
1163 // Special handling for primitive objects
1164 if (java_lang_Class::is_primitive(mirror)) {
1165 // Primitive objects does not have any interfaces
1166 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1167 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1168 }
1169
1170 Klass* klass = java_lang_Class::as_Klass(mirror);
1171 // Figure size of result array
1172 int size;
1173 if (klass->is_instance_klass()) {
1174 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1175 } else {
1176 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1177 size = 2;
1178 }
1179
1180 // Allocate result array
1181 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1182 objArrayHandle result (THREAD, r);
1183 // Fill in result
1184 if (klass->is_instance_klass()) {
1185 // Regular instance klass, fill in all local interfaces
1186 for (int index = 0; index < size; index++) {
1187 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1188 result->obj_at_put(index, k->java_mirror());
1189 }
1190 } else {
1191 // All arrays implement java.lang.Cloneable and java.io.Serializable
1192 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1193 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1194 }
1195 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1196 JVM_END
1197
1198
1199 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1200 oop mirror = JNIHandles::resolve_non_null(cls);
1201 if (java_lang_Class::is_primitive(mirror)) {
1202 return JNI_FALSE;
1203 }
1204 Klass* k = java_lang_Class::as_Klass(mirror);
1205 return k->is_hidden();
1206 JVM_END
1207
1208
1209 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1210 ResourceMark rm(THREAD);
1211 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1212 JvmtiVMObjectAllocEventCollector oam;
1213
1214 // Iterate through Java frames
1215 vframeStream vfst(thread);
1216 for(; !vfst.at_end(); vfst.next()) {
1217 int loc = -1;
1218 // get method of frame
1219 Method* method = vfst.method();
1220
1221 Symbol *name = method->name();
1222
1223 InstanceKlass* holder = method->method_holder();
1224 if (name == vmSymbols::runWith_method_name()) {
1225 if (holder == vmClasses::Thread_klass()
1226 || holder == vmClasses::ScopedValue_Carrier_klass()) {
1227 loc = 1;
1228 }
1229 }
1230
1231 if (loc != -1) {
1232 javaVFrame *frame = vfst.asJavaVFrame();
1233 StackValueCollection* locals = frame->locals();
1234 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1235 Handle result = head_sv->get_obj();
1236 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1237 if (result() != nullptr) {
1238 return JNIHandles::make_local(THREAD, result());
1239 }
1240 }
1241 }
1242
1243 return nullptr;
1244 JVM_END
1245
1246 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1247 JvmtiVMObjectAllocEventCollector oam;
1248 // ofClass is a reference to a java_lang_Class object. The mirror object
1249 // of an InstanceKlass
1250 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1251 if (java_lang_Class::is_primitive(ofMirror) ||
1252 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1253 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1254 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1255 }
1256
1257 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1258 InnerClassesIterator iter(k);
1259
1260 if (iter.length() == 0) {
1261 // Neither an inner nor outer class
1262 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1263 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1264 }
1265
1266 // find inner class info
1267 constantPoolHandle cp(thread, k->constants());
1268 int length = iter.length();
1269
1270 // Allocate temp. result array
1271 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1272 objArrayHandle result (THREAD, r);
1273 int members = 0;
1274
1275 for (; !iter.done(); iter.next()) {
1276 int ioff = iter.inner_class_info_index();
1277 int ooff = iter.outer_class_info_index();
1278
1279 if (ioff != 0 && ooff != 0) {
1280 // Check to see if the name matches the class we're looking for
1281 // before attempting to find the class.
1282 if (cp->klass_name_at_matches(k, ooff)) {
1283 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1284 if (outer_klass == k) {
1285 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1286 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1287
1288 // Throws an exception if outer klass has not declared k as
1289 // an inner klass
1290 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1291
1292 result->obj_at_put(members, inner_klass->java_mirror());
1293 members++;
1294 }
1295 }
1296 }
1297 }
1298
1299 if (members != length) {
1300 // Return array of right length
1301 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1302 for(int i = 0; i < members; i++) {
1303 res->obj_at_put(i, result->obj_at(i));
1304 }
1305 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1306 }
1307
1308 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1309 JVM_END
1310
1311
1312 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1313 {
1314 // ofClass is a reference to a java_lang_Class object.
1315 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1316 if (java_lang_Class::is_primitive(ofMirror)) {
1317 return nullptr;
1318 }
1319 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1320 if (!klass->is_instance_klass()) {
1321 return nullptr;
1322 }
1323
1324 bool inner_is_member = false;
1325 Klass* outer_klass
1326 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1327 if (outer_klass == nullptr) return nullptr; // already a top-level class
1328 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1329 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1330 }
1331 JVM_END
1332
1333 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1334 {
1335 oop mirror = JNIHandles::resolve_non_null(cls);
1336 if (java_lang_Class::is_primitive(mirror)) {
1337 return nullptr;
1338 }
1339 Klass* klass = java_lang_Class::as_Klass(mirror);
1340 if (!klass->is_instance_klass()) {
1341 return nullptr;
1342 }
1343 InstanceKlass* k = InstanceKlass::cast(klass);
1344 int ooff = 0, noff = 0;
1345 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1346 if (noff != 0) {
1347 constantPoolHandle i_cp(thread, k->constants());
1348 Symbol* name = i_cp->symbol_at(noff);
1349 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1350 return (jstring) JNIHandles::make_local(THREAD, str());
1351 }
1352 }
1353 return nullptr;
1354 }
1355 JVM_END
1356
1357 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1358 assert (cls != nullptr, "illegal class");
1359 JvmtiVMObjectAllocEventCollector oam;
1360 ResourceMark rm(THREAD);
1361 oop mirror = JNIHandles::resolve_non_null(cls);
1362 // Return null for arrays and primitives
1363 if (!java_lang_Class::is_primitive(mirror)) {
1364 Klass* k = java_lang_Class::as_Klass(mirror);
1365 if (k->is_instance_klass()) {
1366 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1367 if (sym == nullptr) return nullptr;
1368 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1369 return (jstring) JNIHandles::make_local(THREAD, str());
1370 }
1371 }
1372 return nullptr;
1373 JVM_END
1374
1375
1376 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1377 assert (cls != nullptr, "illegal class");
1378 oop mirror = JNIHandles::resolve_non_null(cls);
1379 // Return null for arrays and primitives
1380 if (!java_lang_Class::is_primitive(mirror)) {
1381 Klass* k = java_lang_Class::as_Klass(mirror);
1382 if (k->is_instance_klass()) {
1383 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1384 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1385 }
1386 }
1387 return nullptr;
1388 JVM_END
1389
1390
1391 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1392 // some of this code was adapted from from jni_FromReflectedField
1393
1394 oop reflected = JNIHandles::resolve_non_null(field);
1395 oop mirror = java_lang_reflect_Field::clazz(reflected);
1396 int slot = java_lang_reflect_Field::slot(reflected);
1397 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1398
1399 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1400 int offset = ik->field_offset(slot);
1401
1402 if (modifiers & JVM_ACC_STATIC) {
1403 // for static fields we only look in the current class
1404 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1405 assert(false, "cannot find static field");
1406 return false;
1407 }
1408 } else {
1409 // for instance fields we start with the current class and work
1410 // our way up through the superclass chain
1411 if (!ik->find_field_from_offset(offset, false, &fd)) {
1412 assert(false, "cannot find instance field");
1413 return false;
1414 }
1415 }
1416 return true;
1417 }
1418
1419 static Method* jvm_get_method_common(jobject method) {
1420 // some of this code was adapted from from jni_FromReflectedMethod
1421
1422 oop reflected = JNIHandles::resolve_non_null(method);
1423 oop mirror = nullptr;
1424 int slot = 0;
1425
1426 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1427 mirror = java_lang_reflect_Constructor::clazz(reflected);
1428 slot = java_lang_reflect_Constructor::slot(reflected);
1429 } else {
1430 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1431 "wrong type");
1432 mirror = java_lang_reflect_Method::clazz(reflected);
1433 slot = java_lang_reflect_Method::slot(reflected);
1434 }
1435 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1436
1437 Method* m = ik->method_with_idnum(slot);
1438 assert(m != nullptr, "cannot find method");
1439 return m; // caller has to deal with null in product mode
1440 }
1441
1442 /* Type use annotations support (JDK 1.8) */
1443
1444 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1445 assert (cls != nullptr, "illegal class");
1446 ResourceMark rm(THREAD);
1447 // Return null for arrays and primitives
1448 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1449 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1450 if (k->is_instance_klass()) {
1451 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1452 if (type_annotations != nullptr) {
1453 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1454 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1455 }
1456 }
1457 }
1458 return nullptr;
1459 JVM_END
1460
1461 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1462 assert (method != nullptr, "illegal method");
1463 // method is a handle to a java.lang.reflect.Method object
1464 Method* m = jvm_get_method_common(method);
1465 if (m == nullptr) {
1466 return nullptr;
1467 }
1468
1469 AnnotationArray* type_annotations = m->type_annotations();
1470 if (type_annotations != nullptr) {
1471 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1472 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1473 }
1474
1475 return nullptr;
1476 JVM_END
1477
1478 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1479 assert (field != nullptr, "illegal field");
1480 fieldDescriptor fd;
1481 bool gotFd = jvm_get_field_common(field, fd);
1482 if (!gotFd) {
1483 return nullptr;
1484 }
1485
1486 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1487 JVM_END
1488
1489 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1490 if (!cp->is_within_bounds(index)) {
1491 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1492 }
1493 }
1494
1495 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1496 {
1497 // method is a handle to a java.lang.reflect.Method object
1498 Method* method_ptr = jvm_get_method_common(method);
1499 methodHandle mh (THREAD, method_ptr);
1500 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1501 const int num_params = mh->method_parameters_length();
1502
1503 if (num_params < 0) {
1504 // A -1 return value from method_parameters_length means there is no
1505 // parameter data. Return null to indicate this to the reflection
1506 // API.
1507 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1508 return (jobjectArray)nullptr;
1509 } else {
1510 // Otherwise, we return something up to reflection, even if it is
1511 // a zero-length array. Why? Because in some cases this can
1512 // trigger a MalformedParametersException.
1513
1514 // make sure all the symbols are properly formatted
1515 for (int i = 0; i < num_params; i++) {
1516 MethodParametersElement* params = mh->method_parameters_start();
1517 int index = params[i].name_cp_index;
1518 constantPoolHandle cp(THREAD, mh->constants());
1519 bounds_check(cp, index, CHECK_NULL);
1520
1521 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1522 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1523 "Wrong type at constant pool index");
1524 }
1525
1526 }
1527
1528 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1529 objArrayHandle result (THREAD, result_oop);
1530
1531 for (int i = 0; i < num_params; i++) {
1532 MethodParametersElement* params = mh->method_parameters_start();
1533 // For a 0 index, give a null symbol
1534 Symbol* sym = 0 != params[i].name_cp_index ?
1535 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1536 int flags = params[i].flags;
1537 oop param = Reflection::new_parameter(reflected_method, i, sym,
1538 flags, CHECK_NULL);
1539 result->obj_at_put(i, param);
1540 }
1541 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1542 }
1543 }
1544 JVM_END
1545
1546 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1547
1548 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1549 {
1550 JvmtiVMObjectAllocEventCollector oam;
1551
1552 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1553 // Exclude primitive types and array types
1554 if (java_lang_Class::is_primitive(ofMirror) ||
1555 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1556 // Return empty array
1557 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1558 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1559 }
1560
1561 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1562 constantPoolHandle cp(THREAD, k->constants());
1563
1564 // Ensure class is linked
1565 k->link_class(CHECK_NULL);
1566
1567 // Allocate result
1568 int num_fields;
1569
1570 if (publicOnly) {
1571 num_fields = 0;
1572 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1573 if (fs.access_flags().is_public()) ++num_fields;
1574 }
1575 } else {
1576 num_fields = k->java_fields_count();
1577 }
1578
1579 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1580 objArrayHandle result (THREAD, r);
1581
1582 int out_idx = 0;
1583 fieldDescriptor fd;
1584 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1585 if (!publicOnly || fs.access_flags().is_public()) {
1586 fd.reinitialize(k, fs.to_FieldInfo());
1587 oop field = Reflection::new_field(&fd, CHECK_NULL);
1588 result->obj_at_put(out_idx, field);
1589 ++out_idx;
1590 }
1591 }
1592 assert(out_idx == num_fields, "just checking");
1593 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1594 }
1595 JVM_END
1596
1597 // A class is a record if and only if it is final and a direct subclass of
1598 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1599 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1600 {
1601 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1602 if (k != nullptr && k->is_instance_klass()) {
1603 InstanceKlass* ik = InstanceKlass::cast(k);
1604 return ik->is_record();
1605 } else {
1606 return false;
1607 }
1608 }
1609 JVM_END
1610
1611 // Returns an array containing the components of the Record attribute,
1612 // or null if the attribute is not present.
1613 //
1614 // Note that this function returns the components of the Record attribute
1615 // even if the class is not a record.
1616 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1617 {
1618 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1619
1620 Array<RecordComponent*>* components = ik->record_components();
1621 if (components != nullptr) {
1622 JvmtiVMObjectAllocEventCollector oam;
1623 constantPoolHandle cp(THREAD, ik->constants());
1624 int length = components->length();
1625 assert(length >= 0, "unexpected record_components length");
1626 objArrayOop record_components =
1627 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1628 objArrayHandle components_h (THREAD, record_components);
1629
1630 for (int x = 0; x < length; x++) {
1631 RecordComponent* component = components->at(x);
1632 assert(component != nullptr, "unexpected null record component");
1633 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1634 components_h->obj_at_put(x, component_oop);
1635 }
1636 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1637 }
1638
1639 return nullptr;
1640 }
1641 JVM_END
1642
1643 static jobjectArray get_class_declared_methods_helper(
1644 JNIEnv *env,
1645 jclass ofClass, jboolean publicOnly,
1646 bool want_constructor,
1647 Klass* klass, TRAPS) {
1648
1649 JvmtiVMObjectAllocEventCollector oam;
1650
1651 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1652 // Exclude primitive types and array types
1653 if (java_lang_Class::is_primitive(ofMirror)
1654 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1655 // Return empty array
1656 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1657 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1658 }
1659
1660 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1661
1662 // Ensure class is linked
1663 k->link_class(CHECK_NULL);
1664
1665 Array<Method*>* methods = k->methods();
1666 int methods_length = methods->length();
1667
1668 // Save original method_idnum in case of redefinition, which can change
1669 // the idnum of obsolete methods. The new method will have the same idnum
1670 // but if we refresh the methods array, the counts will be wrong.
1671 ResourceMark rm(THREAD);
1672 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1673 int num_methods = 0;
1674
1675 // Select methods matching the criteria.
1676 for (int i = 0; i < methods_length; i++) {
1677 Method* method = methods->at(i);
1678 if (want_constructor && !method->is_object_initializer()) {
1679 continue;
1680 }
1681 if (!want_constructor &&
1682 (method->is_object_initializer() || method->is_static_initializer() ||
1683 method->is_overpass())) {
1684 continue;
1685 }
1686 if (publicOnly && !method->is_public()) {
1687 continue;
1688 }
1689 idnums->push(method->method_idnum());
1690 ++num_methods;
1691 }
1692
1693 // Allocate result
1694 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1695 objArrayHandle result (THREAD, r);
1696
1697 // Now just put the methods that we selected above, but go by their idnum
1698 // in case of redefinition. The methods can be redefined at any safepoint,
1699 // so above when allocating the oop array and below when creating reflect
1700 // objects.
1701 for (int i = 0; i < num_methods; i++) {
1702 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1703 if (method.is_null()) {
1704 // Method may have been deleted and seems this API can handle null
1705 // Otherwise should probably put a method that throws NSME
1706 result->obj_at_put(i, nullptr);
1707 } else {
1708 oop m;
1709 if (want_constructor) {
1710 m = Reflection::new_constructor(method, CHECK_NULL);
1711 } else {
1712 m = Reflection::new_method(method, false, CHECK_NULL);
1713 }
1714 result->obj_at_put(i, m);
1715 }
1716 }
1717
1718 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1719 }
1720
1721 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1722 {
1723 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1724 /*want_constructor*/ false,
1725 vmClasses::reflect_Method_klass(), THREAD);
1726 }
1727 JVM_END
1728
1729 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1730 {
1731 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1732 /*want_constructor*/ true,
1733 vmClasses::reflect_Constructor_klass(), THREAD);
1734 }
1735 JVM_END
1736
1737 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1738 {
1739 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1740 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1741 return c->has_nestmate_access_to(m, THREAD);
1742 }
1743 JVM_END
1744
1745 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1746 {
1747 // current is not a primitive or array class
1748 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1749 InstanceKlass* host = c->nest_host(THREAD);
1750 return (jclass) (host == nullptr ? nullptr :
1751 JNIHandles::make_local(THREAD, host->java_mirror()));
1752 }
1753 JVM_END
1754
1755 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1756 {
1757 // current is not a primitive or array class
1758 ResourceMark rm(THREAD);
1759 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1760 InstanceKlass* host = c->nest_host(THREAD);
1761
1762 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1763 c->external_name(), host->external_name());
1764 {
1765 JvmtiVMObjectAllocEventCollector oam;
1766 Array<u2>* members = host->nest_members();
1767 int length = members == nullptr ? 0 : members->length();
1768
1769 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1770
1771 // nest host is first in the array so make it one bigger
1772 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1773 length + 1, CHECK_NULL);
1774 objArrayHandle result(THREAD, r);
1775 result->obj_at_put(0, host->java_mirror());
1776 if (length != 0) {
1777 int count = 0;
1778 for (int i = 0; i < length; i++) {
1779 int cp_index = members->at(i);
1780 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1781 if (HAS_PENDING_EXCEPTION) {
1782 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1783 return nullptr; // propagate VMEs
1784 }
1785 if (log_is_enabled(Trace, class, nestmates)) {
1786 stringStream ss;
1787 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1788 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1789 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1790 log_trace(class, nestmates)("%s", ss.as_string());
1791 }
1792 CLEAR_PENDING_EXCEPTION;
1793 continue;
1794 }
1795 if (k->is_instance_klass()) {
1796 InstanceKlass* ik = InstanceKlass::cast(k);
1797 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1798 if (nest_host_k == host) {
1799 result->obj_at_put(count+1, k->java_mirror());
1800 count++;
1801 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1802 } else {
1803 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1804 ik->external_name(), nest_host_k->external_name());
1805 }
1806 } else {
1807 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1808 k->external_name());
1809 }
1810 }
1811 if (count < length) {
1812 // we had invalid entries so we need to compact the array
1813 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1814 length + 1, count + 1);
1815
1816 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1817 count + 1, CHECK_NULL);
1818 objArrayHandle result2(THREAD, r2);
1819 for (int i = 0; i < count + 1; i++) {
1820 result2->obj_at_put(i, result->obj_at(i));
1821 }
1822 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1823 }
1824 }
1825 else {
1826 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1827 }
1828 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1829 }
1830 }
1831 JVM_END
1832
1833 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1834 {
1835 oop mirror = JNIHandles::resolve_non_null(current);
1836 assert(!java_lang_Class::is_primitive(mirror), "should not be");
1837 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1838
1839 ResourceMark rm(THREAD);
1840 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
1841 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
1842 if (ik->is_sealed()) {
1843 JvmtiVMObjectAllocEventCollector oam;
1844 Array<u2>* subclasses = ik->permitted_subclasses();
1845 int length = subclasses->length();
1846
1847 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
1848
1849 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1850 length, CHECK_NULL);
1851 objArrayHandle result(THREAD, r);
1852 int count = 0;
1853 for (int i = 0; i < length; i++) {
1854 int cp_index = subclasses->at(i);
1855 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
1856 if (HAS_PENDING_EXCEPTION) {
1857 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1858 return nullptr; // propagate VMEs
1859 }
1860 if (log_is_enabled(Trace, class, sealed)) {
1861 stringStream ss;
1862 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
1863 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
1864 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1865 log_trace(class, sealed)("%s", ss.as_string());
1866 }
1867
1868 CLEAR_PENDING_EXCEPTION;
1869 continue;
1870 }
1871 if (k->is_instance_klass()) {
1872 result->obj_at_put(count++, k->java_mirror());
1873 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
1874 }
1875 }
1876 if (count < length) {
1877 // we had invalid entries so we need to compact the array
1878 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1879 count, CHECK_NULL);
1880 objArrayHandle result2(THREAD, r2);
1881 for (int i = 0; i < count; i++) {
1882 result2->obj_at_put(i, result->obj_at(i));
1883 }
1884 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1885 }
1886 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1887 } else {
1888 return nullptr;
1889 }
1890 }
1891 JVM_END
1892
1893 // Constant pool access //////////////////////////////////////////////////////////
1894
1895 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1896 {
1897 JvmtiVMObjectAllocEventCollector oam;
1898 oop mirror = JNIHandles::resolve_non_null(cls);
1899 // Return null for primitives and arrays
1900 if (!java_lang_Class::is_primitive(mirror)) {
1901 Klass* k = java_lang_Class::as_Klass(mirror);
1902 if (k->is_instance_klass()) {
1903 InstanceKlass* k_h = InstanceKlass::cast(k);
1904 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1905 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1906 return JNIHandles::make_local(THREAD, jcp());
1907 }
1908 }
1909 return nullptr;
1910 }
1911 JVM_END
1912
1913
1914 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
1915 {
1916 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1917 return cp->length();
1918 }
1919 JVM_END
1920
1921
1922 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
1923 {
1924 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1925 bounds_check(cp, index, CHECK_NULL);
1926 constantTag tag = cp->tag_at(index);
1927 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1928 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1929 }
1930 Klass* k = cp->klass_at(index, CHECK_NULL);
1931 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1932 }
1933 JVM_END
1934
1935 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1936 {
1937 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1938 bounds_check(cp, index, CHECK_NULL);
1939 constantTag tag = cp->tag_at(index);
1940 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1941 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1942 }
1943 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1944 if (k == nullptr) return nullptr;
1945 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1946 }
1947 JVM_END
1948
1949 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1950 constantTag tag = cp->tag_at(index);
1951 if (!tag.is_method() && !tag.is_interface_method()) {
1952 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1953 }
1954 int klass_ref = cp->uncached_klass_ref_index_at(index);
1955 Klass* k_o;
1956 if (force_resolution) {
1957 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1958 } else {
1959 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1960 if (k_o == nullptr) return nullptr;
1961 }
1962 InstanceKlass* k = InstanceKlass::cast(k_o);
1963 Symbol* name = cp->uncached_name_ref_at(index);
1964 Symbol* sig = cp->uncached_signature_ref_at(index);
1965 methodHandle m (THREAD, k->find_method(name, sig));
1966 if (m.is_null()) {
1967 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1968 }
1969 oop method;
1970 if (m->is_object_initializer()) {
1971 method = Reflection::new_constructor(m, CHECK_NULL);
1972 } else {
1973 // new_method accepts <clinit> as Method here
1974 method = Reflection::new_method(m, true, CHECK_NULL);
1975 }
1976 return JNIHandles::make_local(THREAD, method);
1977 }
1978
1979 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
1980 {
1981 JvmtiVMObjectAllocEventCollector oam;
1982 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1983 bounds_check(cp, index, CHECK_NULL);
1984 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1985 return res;
1986 }
1987 JVM_END
1988
1989 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1990 {
1991 JvmtiVMObjectAllocEventCollector oam;
1992 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1993 bounds_check(cp, index, CHECK_NULL);
1994 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1995 return res;
1996 }
1997 JVM_END
1998
1999 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2000 constantTag tag = cp->tag_at(index);
2001 if (!tag.is_field()) {
2002 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2003 }
2004 int klass_ref = cp->uncached_klass_ref_index_at(index);
2005 Klass* k_o;
2006 if (force_resolution) {
2007 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2008 } else {
2009 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2010 if (k_o == nullptr) return nullptr;
2011 }
2012 InstanceKlass* k = InstanceKlass::cast(k_o);
2013 Symbol* name = cp->uncached_name_ref_at(index);
2014 Symbol* sig = cp->uncached_signature_ref_at(index);
2015 fieldDescriptor fd;
2016 Klass* target_klass = k->find_field(name, sig, &fd);
2017 if (target_klass == nullptr) {
2018 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2019 }
2020 oop field = Reflection::new_field(&fd, CHECK_NULL);
2021 return JNIHandles::make_local(THREAD, field);
2022 }
2023
2024 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2025 {
2026 JvmtiVMObjectAllocEventCollector oam;
2027 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2028 bounds_check(cp, index, CHECK_NULL);
2029 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2030 return res;
2031 }
2032 JVM_END
2033
2034 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2035 {
2036 JvmtiVMObjectAllocEventCollector oam;
2037 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2038 bounds_check(cp, index, CHECK_NULL);
2039 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2040 return res;
2041 }
2042 JVM_END
2043
2044 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2045 {
2046 JvmtiVMObjectAllocEventCollector oam;
2047 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2048 bounds_check(cp, index, CHECK_NULL);
2049 constantTag tag = cp->tag_at(index);
2050 if (!tag.is_field_or_method()) {
2051 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2052 }
2053 int klass_ref = cp->uncached_klass_ref_index_at(index);
2054 Symbol* klass_name = cp->klass_name_at(klass_ref);
2055 Symbol* member_name = cp->uncached_name_ref_at(index);
2056 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2057 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2058 objArrayHandle dest(THREAD, dest_o);
2059 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2060 dest->obj_at_put(0, str());
2061 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2062 dest->obj_at_put(1, str());
2063 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2064 dest->obj_at_put(2, str());
2065 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2066 }
2067 JVM_END
2068
2069 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2070 {
2071 JvmtiVMObjectAllocEventCollector oam;
2072 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2073 bounds_check(cp, index, CHECK_0);
2074 constantTag tag = cp->tag_at(index);
2075 if (!tag.is_field_or_method()) {
2076 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2077 }
2078 return (jint) cp->uncached_klass_ref_index_at(index);
2079 }
2080 JVM_END
2081
2082 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2083 {
2084 JvmtiVMObjectAllocEventCollector oam;
2085 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2086 bounds_check(cp, index, CHECK_0);
2087 constantTag tag = cp->tag_at(index);
2088 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2089 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2090 }
2091 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2092 }
2093 JVM_END
2094
2095 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2096 {
2097 JvmtiVMObjectAllocEventCollector oam;
2098 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2099 bounds_check(cp, index, CHECK_NULL);
2100 constantTag tag = cp->tag_at(index);
2101 if (!tag.is_name_and_type()) {
2102 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2103 }
2104 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2105 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2106 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2107 objArrayHandle dest(THREAD, dest_o);
2108 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2109 dest->obj_at_put(0, str());
2110 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2111 dest->obj_at_put(1, str());
2112 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2113 }
2114 JVM_END
2115
2116 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2117 {
2118 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2119 bounds_check(cp, index, CHECK_0);
2120 constantTag tag = cp->tag_at(index);
2121 if (!tag.is_int()) {
2122 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2123 }
2124 return cp->int_at(index);
2125 }
2126 JVM_END
2127
2128 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2129 {
2130 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2131 bounds_check(cp, index, CHECK_(0L));
2132 constantTag tag = cp->tag_at(index);
2133 if (!tag.is_long()) {
2134 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2135 }
2136 return cp->long_at(index);
2137 }
2138 JVM_END
2139
2140 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2141 {
2142 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2143 bounds_check(cp, index, CHECK_(0.0f));
2144 constantTag tag = cp->tag_at(index);
2145 if (!tag.is_float()) {
2146 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2147 }
2148 return cp->float_at(index);
2149 }
2150 JVM_END
2151
2152 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2153 {
2154 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2155 bounds_check(cp, index, CHECK_(0.0));
2156 constantTag tag = cp->tag_at(index);
2157 if (!tag.is_double()) {
2158 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2159 }
2160 return cp->double_at(index);
2161 }
2162 JVM_END
2163
2164 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2165 {
2166 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2167 bounds_check(cp, index, CHECK_NULL);
2168 constantTag tag = cp->tag_at(index);
2169 if (!tag.is_string()) {
2170 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2171 }
2172 oop str = cp->string_at(index, CHECK_NULL);
2173 return (jstring) JNIHandles::make_local(THREAD, str);
2174 }
2175 JVM_END
2176
2177 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2178 {
2179 JvmtiVMObjectAllocEventCollector oam;
2180 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2181 bounds_check(cp, index, CHECK_NULL);
2182 constantTag tag = cp->tag_at(index);
2183 if (!tag.is_symbol()) {
2184 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2185 }
2186 Symbol* sym = cp->symbol_at(index);
2187 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2188 return (jstring) JNIHandles::make_local(THREAD, str());
2189 }
2190 JVM_END
2191
2192 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2193 {
2194 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2195 bounds_check(cp, index, CHECK_0);
2196 constantTag tag = cp->tag_at(index);
2197 jbyte result = tag.value();
2198 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2199 // they are changed to the corresponding tags from the JVM spec, so that java code in
2200 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2201 if (tag.is_klass_or_reference()) {
2202 result = JVM_CONSTANT_Class;
2203 } else if (tag.is_string_index()) {
2204 result = JVM_CONSTANT_String;
2205 } else if (tag.is_method_type_in_error()) {
2206 result = JVM_CONSTANT_MethodType;
2207 } else if (tag.is_method_handle_in_error()) {
2208 result = JVM_CONSTANT_MethodHandle;
2209 } else if (tag.is_dynamic_constant_in_error()) {
2210 result = JVM_CONSTANT_Dynamic;
2211 }
2212 return result;
2213 }
2214 JVM_END
2215
2216 // Assertion support. //////////////////////////////////////////////////////////
2217
2218 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2219 assert(cls != nullptr, "bad class");
2220
2221 oop r = JNIHandles::resolve(cls);
2222 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2223 if (java_lang_Class::is_primitive(r)) return false;
2224
2225 Klass* k = java_lang_Class::as_Klass(r);
2226 assert(k->is_instance_klass(), "must be an instance klass");
2227 if (!k->is_instance_klass()) return false;
2228
2229 ResourceMark rm(THREAD);
2230 const char* name = k->name()->as_C_string();
2231 bool system_class = k->class_loader() == nullptr;
2232 return JavaAssertions::enabled(name, system_class);
2233
2234 JVM_END
2235
2236
2237 // Return a new AssertionStatusDirectives object with the fields filled in with
2238 // command-line assertion arguments (i.e., -ea, -da).
2239 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2240 JvmtiVMObjectAllocEventCollector oam;
2241 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2242 return JNIHandles::make_local(THREAD, asd);
2243 JVM_END
2244
2245 // Verification ////////////////////////////////////////////////////////////////////////////////
2246
2247 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2248
2249 // RedefineClasses support: bug 6214132 caused verification to fail.
2250 // All functions from this section, unless noted otherwise, should call the functions
2251 // get_klass_considering_redefinition(), or
2252 // get_instance_klass_considering_redefinition()
2253 // These functions return JvmtiThreadState::_scratch_class if the verifier
2254 // was invoked in the middle of the redefinition of cls.
2255 // See jvmtiThreadState.hpp for details.
2256
2257 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2258 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2259 if (k->is_instance_klass()) {
2260 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2261 } else {
2262 return k;
2263 }
2264 }
2265
2266 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2267 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2268 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2269 }
2270
2271 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2272 oop mirror = JNIHandles::resolve_non_null(cls);
2273 if (java_lang_Class::is_primitive(mirror)) {
2274 return JNI_FALSE;
2275 }
2276 Klass* k = java_lang_Class::as_Klass(mirror);
2277 // This isn't necessary since answer is the same because redefinition
2278 // has already checked this matches for the scratch class.
2279 // k = get_klass_considering_redefinition(cls, thread)
2280 jboolean result = k->is_interface();
2281 assert(!result || k->is_instance_klass(),
2282 "all interfaces are instance types");
2283 return result;
2284 JVM_END
2285
2286 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2287 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2288 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2289 return k->name()->as_utf8();
2290 JVM_END
2291
2292
2293 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2294 Klass* k = get_klass_considering_redefinition(cls, thread);
2295 // types will have length zero if this is not an InstanceKlass
2296 // (length is determined by call to JVM_GetClassCPEntriesCount)
2297 if (k->is_instance_klass()) {
2298 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2299 for (int index = cp->length() - 1; index >= 0; index--) {
2300 constantTag tag = cp->tag_at(index);
2301 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2302 }
2303 }
2304 JVM_END
2305
2306
2307 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2308 Klass* k = get_klass_considering_redefinition(cls, thread);
2309 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2310 JVM_END
2311
2312
2313 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2314 Klass* k = get_klass_considering_redefinition(cls, thread);
2315 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2316 JVM_END
2317
2318
2319 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2320 Klass* k = get_klass_considering_redefinition(cls, thread);
2321 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2322 JVM_END
2323
2324
2325 // The following methods, used for the verifier, are never called with
2326 // array klasses, so a direct cast to InstanceKlass is safe.
2327 // Typically, these methods are called in a loop with bounds determined
2328 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2329 // zero for arrays.
2330 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2331 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2332 Method* method = ik->methods()->at(method_index);
2333 int length = method->checked_exceptions_length();
2334 if (length > 0) {
2335 CheckedExceptionElement* table= method->checked_exceptions_start();
2336 for (int i = 0; i < length; i++) {
2337 exceptions[i] = table[i].class_cp_index;
2338 }
2339 }
2340 JVM_END
2341
2342
2343 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2344 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2345 Method* method = ik->methods()->at(method_index);
2346 return method->checked_exceptions_length();
2347 JVM_END
2348
2349
2350 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2351 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2352 Method* method = ik->methods()->at(method_index);
2353 memcpy(code, method->code_base(), method->code_size());
2354 JVM_END
2355
2356
2357 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2358 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2359 Method* method = ik->methods()->at(method_index);
2360 return method->code_size();
2361 JVM_END
2362
2363
2364 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2365 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2366 Method* method = ik->methods()->at(method_index);
2367 ExceptionTable extable(method);
2368 entry->start_pc = extable.start_pc(entry_index);
2369 entry->end_pc = extable.end_pc(entry_index);
2370 entry->handler_pc = extable.handler_pc(entry_index);
2371 entry->catchType = extable.catch_type_index(entry_index);
2372 JVM_END
2373
2374
2375 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2376 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2377 Method* method = ik->methods()->at(method_index);
2378 return method->exception_table_length();
2379 JVM_END
2380
2381
2382 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2383 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2384 Method* method = ik->methods()->at(method_index);
2385 return method->access_flags().as_method_flags();
2386 JVM_END
2387
2388
2389 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2390 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2391 return ik->field_access_flags(field_index);
2392 JVM_END
2393
2394
2395 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2396 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2397 Method* method = ik->methods()->at(method_index);
2398 return method->max_locals();
2399 JVM_END
2400
2401
2402 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2403 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2404 Method* method = ik->methods()->at(method_index);
2405 return method->size_of_parameters();
2406 JVM_END
2407
2408
2409 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2410 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2411 Method* method = ik->methods()->at(method_index);
2412 return method->verifier_max_stack();
2413 JVM_END
2414
2415
2416 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2417 ResourceMark rm(THREAD);
2418 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2419 Method* method = ik->methods()->at(method_index);
2420 return method->name() == vmSymbols::object_initializer_name();
2421 JVM_END
2422
2423
2424 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2425 ResourceMark rm(THREAD);
2426 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2427 Method* method = ik->methods()->at(method_index);
2428 return method->is_overpass();
2429 JVM_END
2430
2431 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2432 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2433 Method* method = ik->methods()->at(method_index);
2434 return method->name()->as_utf8();
2435 JVM_END
2436
2437
2438 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2439 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2440 Method* method = ik->methods()->at(method_index);
2441 return method->signature()->as_utf8();
2442 JVM_END
2443
2444 /**
2445 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2446 * read entries in the constant pool. Since the old verifier always
2447 * works on a copy of the code, it will not see any rewriting that
2448 * may possibly occur in the middle of verification. So it is important
2449 * that nothing it calls tries to use the cpCache instead of the raw
2450 * constant pool, so we must use cp->uncached_x methods when appropriate.
2451 */
2452 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2453 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2454 ConstantPool* cp = ik->constants();
2455 switch (cp->tag_at(cp_index).value()) {
2456 case JVM_CONSTANT_Fieldref:
2457 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2458 default:
2459 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2460 }
2461 ShouldNotReachHere();
2462 return nullptr;
2463 JVM_END
2464
2465
2466 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2467 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2468 ConstantPool* cp = ik->constants();
2469 switch (cp->tag_at(cp_index).value()) {
2470 case JVM_CONSTANT_InterfaceMethodref:
2471 case JVM_CONSTANT_Methodref:
2472 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2473 default:
2474 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2475 }
2476 ShouldNotReachHere();
2477 return nullptr;
2478 JVM_END
2479
2480
2481 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2482 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2483 ConstantPool* cp = ik->constants();
2484 switch (cp->tag_at(cp_index).value()) {
2485 case JVM_CONSTANT_InterfaceMethodref:
2486 case JVM_CONSTANT_Methodref:
2487 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2488 default:
2489 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2490 }
2491 ShouldNotReachHere();
2492 return nullptr;
2493 JVM_END
2494
2495
2496 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2497 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2498 ConstantPool* cp = ik->constants();
2499 switch (cp->tag_at(cp_index).value()) {
2500 case JVM_CONSTANT_Fieldref:
2501 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2502 default:
2503 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2504 }
2505 ShouldNotReachHere();
2506 return nullptr;
2507 JVM_END
2508
2509
2510 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2511 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2512 ConstantPool* cp = ik->constants();
2513 Symbol* classname = cp->klass_name_at(cp_index);
2514 return classname->as_utf8();
2515 JVM_END
2516
2517
2518 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2519 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2520 ConstantPool* cp = ik->constants();
2521 switch (cp->tag_at(cp_index).value()) {
2522 case JVM_CONSTANT_Fieldref: {
2523 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2524 Symbol* classname = cp->klass_name_at(class_index);
2525 return classname->as_utf8();
2526 }
2527 default:
2528 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2529 }
2530 ShouldNotReachHere();
2531 return nullptr;
2532 JVM_END
2533
2534
2535 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2536 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2537 ConstantPool* cp = ik->constants();
2538 switch (cp->tag_at(cp_index).value()) {
2539 case JVM_CONSTANT_Methodref:
2540 case JVM_CONSTANT_InterfaceMethodref: {
2541 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2542 Symbol* classname = cp->klass_name_at(class_index);
2543 return classname->as_utf8();
2544 }
2545 default:
2546 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2547 }
2548 ShouldNotReachHere();
2549 return nullptr;
2550 JVM_END
2551
2552
2553 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2554 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2555 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2556 ConstantPool* cp = ik->constants();
2557 ConstantPool* cp_called = ik_called->constants();
2558 switch (cp->tag_at(cp_index).value()) {
2559 case JVM_CONSTANT_Fieldref: {
2560 Symbol* name = cp->uncached_name_ref_at(cp_index);
2561 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2562 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2563 if (fs.name() == name && fs.signature() == signature) {
2564 return fs.access_flags().as_field_flags();
2565 }
2566 }
2567 return -1;
2568 }
2569 default:
2570 fatal("JVM_GetCPFieldModifiers: illegal constant");
2571 }
2572 ShouldNotReachHere();
2573 return 0;
2574 JVM_END
2575
2576
2577 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2578 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2579 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2580 ConstantPool* cp = ik->constants();
2581 switch (cp->tag_at(cp_index).value()) {
2582 case JVM_CONSTANT_Methodref:
2583 case JVM_CONSTANT_InterfaceMethodref: {
2584 Symbol* name = cp->uncached_name_ref_at(cp_index);
2585 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2586 Array<Method*>* methods = ik_called->methods();
2587 int methods_count = methods->length();
2588 for (int i = 0; i < methods_count; i++) {
2589 Method* method = methods->at(i);
2590 if (method->name() == name && method->signature() == signature) {
2591 return method->access_flags().as_method_flags();
2592 }
2593 }
2594 return -1;
2595 }
2596 default:
2597 fatal("JVM_GetCPMethodModifiers: illegal constant");
2598 }
2599 ShouldNotReachHere();
2600 return 0;
2601 JVM_END
2602
2603
2604 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2605
2606 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2607 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2608 JVM_END
2609
2610
2611 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2612 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2613 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2614 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2615 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2616 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2617 JVM_END
2618
2619 // Printing support //////////////////////////////////////////////////
2620 extern "C" {
2621
2622 ATTRIBUTE_PRINTF(3, 0)
2623 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2624 // Reject count values that are negative signed values converted to
2625 // unsigned; see bug 4399518, 4417214
2626 if ((intptr_t)count <= 0) return -1;
2627
2628 int result = os::vsnprintf(str, count, fmt, args);
2629 if (result > 0 && (size_t)result >= count) {
2630 result = -1;
2631 }
2632
2633 return result;
2634 }
2635
2636 ATTRIBUTE_PRINTF(3, 4)
2637 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2638 va_list args;
2639 int len;
2640 va_start(args, fmt);
2641 len = jio_vsnprintf(str, count, fmt, args);
2642 va_end(args);
2643 return len;
2644 }
2645
2646 ATTRIBUTE_PRINTF(2, 3)
2647 int jio_fprintf(FILE* f, const char *fmt, ...) {
2648 int len;
2649 va_list args;
2650 va_start(args, fmt);
2651 len = jio_vfprintf(f, fmt, args);
2652 va_end(args);
2653 return len;
2654 }
2655
2656 ATTRIBUTE_PRINTF(2, 0)
2657 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2658 if (Arguments::vfprintf_hook() != nullptr) {
2659 return Arguments::vfprintf_hook()(f, fmt, args);
2660 } else {
2661 return vfprintf(f, fmt, args);
2662 }
2663 }
2664
2665 ATTRIBUTE_PRINTF(1, 2)
2666 JNIEXPORT int jio_printf(const char *fmt, ...) {
2667 int len;
2668 va_list args;
2669 va_start(args, fmt);
2670 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2671 va_end(args);
2672 return len;
2673 }
2674
2675 // HotSpot specific jio method
2676 void jio_print(const char* s, size_t len) {
2677 // Try to make this function as atomic as possible.
2678 if (Arguments::vfprintf_hook() != nullptr) {
2679 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2680 } else {
2681 // Make an unused local variable to avoid warning from gcc compiler.
2682 bool dummy = os::write(defaultStream::output_fd(), s, len);
2683 }
2684 }
2685
2686 } // Extern C
2687
2688 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2689
2690 // In most of the JVM thread support functions we need to access the
2691 // thread through a ThreadsListHandle to prevent it from exiting and
2692 // being reclaimed while we try to operate on it. The exceptions to this
2693 // rule are when operating on the current thread, or if the monitor of
2694 // the target java.lang.Thread is locked at the Java level - in both
2695 // cases the target cannot exit.
2696
2697 static void thread_entry(JavaThread* thread, TRAPS) {
2698 HandleMark hm(THREAD);
2699 Handle obj(THREAD, thread->threadObj());
2700 JavaValue result(T_VOID);
2701 JavaCalls::call_virtual(&result,
2702 obj,
2703 vmClasses::Thread_klass(),
2704 vmSymbols::run_method_name(),
2705 vmSymbols::void_method_signature(),
2706 THREAD);
2707 }
2708
2709
2710 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2711 #if INCLUDE_CDS
2712 if (CDSConfig::allow_only_single_java_thread()) {
2713 // During java -Xshare:dump, if we allow multiple Java threads to
2714 // execute in parallel, symbols and classes may be loaded in
2715 // random orders which will make the resulting CDS archive
2716 // non-deterministic.
2717 //
2718 // Lucikly, during java -Xshare:dump, it's important to run only
2719 // the code in the main Java thread (which is NOT started here) that
2720 // creates the module graph, etc. It's safe to not start the other
2721 // threads which are launched by class static initializers
2722 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2723 if (log_is_enabled(Info, aot)) {
2724 ResourceMark rm;
2725 oop t = JNIHandles::resolve_non_null(jthread);
2726 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2727 }
2728 return;
2729 }
2730 #endif
2731 JavaThread *native_thread = nullptr;
2732
2733 // We cannot hold the Threads_lock when we throw an exception,
2734 // due to rank ordering issues. Example: we might need to grab the
2735 // Heap_lock while we construct the exception.
2736 bool throw_illegal_thread_state = false;
2737
2738 // We must release the Threads_lock before we can post a jvmti event
2739 // in Thread::start.
2740 {
2741 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2742 // Ensure that the C++ Thread and OSThread structures aren't freed before
2743 // we operate.
2744 MutexLocker ml(Threads_lock);
2745
2746 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2747 // re-starting an already started thread, so we should usually find
2748 // that the JavaThread is null. However for a JNI attached thread
2749 // there is a small window between the Thread object being created
2750 // (with its JavaThread set) and the update to its threadStatus, so we
2751 // have to check for this
2752 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2753 throw_illegal_thread_state = true;
2754 } else {
2755 jlong size =
2756 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2757 // Allocate the C++ Thread structure and create the native thread. The
2758 // stack size retrieved from java is 64-bit signed, but the constructor takes
2759 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2760 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2761 // - Avoid passing negative values which would result in really large stacks.
2762 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2763 size_t sz = size > 0 ? (size_t) size : 0;
2764 native_thread = new JavaThread(&thread_entry, sz);
2765
2766 // At this point it may be possible that no osthread was created for the
2767 // JavaThread due to lack of memory. Check for this situation and throw
2768 // an exception if necessary. Eventually we may want to change this so
2769 // that we only grab the lock if the thread was created successfully -
2770 // then we can also do this check and throw the exception in the
2771 // JavaThread constructor.
2772 if (native_thread->osthread() != nullptr) {
2773 // Note: the current thread is not being used within "prepare".
2774 native_thread->prepare(jthread);
2775 }
2776 }
2777 }
2778
2779 if (throw_illegal_thread_state) {
2780 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2781 }
2782
2783 assert(native_thread != nullptr, "Starting null thread?");
2784
2785 if (native_thread->osthread() == nullptr) {
2786 ResourceMark rm(thread);
2787 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2788 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2789 // No one should hold a reference to the 'native_thread'.
2790 native_thread->smr_delete();
2791 if (JvmtiExport::should_post_resource_exhausted()) {
2792 JvmtiExport::post_resource_exhausted(
2793 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2794 os::native_thread_creation_failed_msg());
2795 }
2796 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2797 os::native_thread_creation_failed_msg());
2798 }
2799
2800 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2801
2802 Thread::start(native_thread);
2803
2804 JVM_END
2805
2806
2807 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2808 ThreadsListHandle tlh(thread);
2809 oop java_thread = nullptr;
2810 JavaThread* receiver = nullptr;
2811 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2812 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2813
2814 if (is_alive) {
2815 // jthread refers to a live JavaThread.
2816 Thread::set_priority(receiver, (ThreadPriority)prio);
2817 }
2818 // Implied else: If the JavaThread hasn't started yet, then the
2819 // priority set in the java.lang.Thread object above will be pushed
2820 // down when it does start.
2821 JVM_END
2822
2823
2824 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2825 HOTSPOT_THREAD_YIELD();
2826 os::naked_yield();
2827 JVM_END
2828
2829 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2830 if (nanos < 0) {
2831 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2832 }
2833
2834 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2835 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2836 }
2837
2838 // Save current thread state and restore it at the end of this block.
2839 // And set new thread state to SLEEPING.
2840 JavaThreadSleepState jtss(thread);
2841
2842 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
2843
2844 if (nanos == 0) {
2845 os::naked_yield();
2846 } else {
2847 ThreadState old_state = thread->osthread()->get_state();
2848 thread->osthread()->set_state(SLEEPING);
2849 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
2850 // An asynchronous exception could have been thrown on
2851 // us while we were sleeping. We do not overwrite those.
2852 if (!HAS_PENDING_EXCEPTION) {
2853 HOTSPOT_THREAD_SLEEP_END(1);
2854 if (!thread->has_async_exception_condition()) {
2855 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2856 // to properly restore the thread state. That's likely wrong.
2857 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2858 }
2859 }
2860 }
2861 thread->osthread()->set_state(old_state);
2862 }
2863 HOTSPOT_THREAD_SLEEP_END(0);
2864 JVM_END
2865
2866 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
2867 oop jthread = thread->threadObj();
2868 assert(jthread != nullptr, "no current carrier thread!");
2869 return JNIHandles::make_local(THREAD, jthread);
2870 JVM_END
2871
2872 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2873 oop theThread = thread->vthread();
2874 assert(theThread != (oop)nullptr, "no current thread!");
2875 return JNIHandles::make_local(THREAD, theThread);
2876 JVM_END
2877
2878 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
2879 jobject theThread))
2880 oop threadObj = JNIHandles::resolve(theThread);
2881 thread->set_vthread(threadObj);
2882
2883 // Set _monitor_owner_id of new current Thread
2884 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
2885
2886 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
2887 JVM_END
2888
2889 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
2890 return ThreadIdentifier::unsafe_offset();
2891 JVM_END
2892
2893 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2894 ThreadsListHandle tlh(thread);
2895 JavaThread* receiver = nullptr;
2896 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
2897 if (is_alive) {
2898 // jthread refers to a live JavaThread.
2899 receiver->interrupt();
2900 }
2901 JVM_END
2902
2903 // Return true iff the current thread has locked the object passed in
2904
2905 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
2906 if (obj == nullptr) {
2907 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
2908 }
2909 Handle h_obj(THREAD, JNIHandles::resolve(obj));
2910 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
2911 JVM_END
2912
2913 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
2914 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
2915 return JNIHandles::make_local(THREAD, trace);
2916 JVM_END
2917
2918 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread, jboolean includeMonitors))
2919 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, includeMonitors, THREAD);
2920 return JNIHandles::make_local(THREAD, snapshot);
2921 JVM_END
2922
2923 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
2924 // We don't use a ThreadsListHandle here because the current thread
2925 // must be alive.
2926 oop java_thread = JNIHandles::resolve_non_null(jthread);
2927 JavaThread* thr = java_lang_Thread::thread(java_thread);
2928 if (thread == thr && !thr->has_attached_via_jni()) {
2929 // Thread naming is only supported for the current thread and
2930 // we don't set the name of an attached thread to avoid stepping
2931 // on other programs.
2932 ResourceMark rm(thread);
2933 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2934 os::set_native_thread_name(thread_name);
2935 }
2936 JVM_END
2937
2938 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
2939 oop theCache = thread->scopedValueCache();
2940 return JNIHandles::make_local(THREAD, theCache);
2941 JVM_END
2942
2943 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
2944 jobject theCache))
2945 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
2946 thread->set_scopedValueCache(objs);
2947 JVM_END
2948
2949
2950 // java.lang.Package ////////////////////////////////////////////////////////////////
2951
2952
2953 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
2954 ResourceMark rm(THREAD);
2955 JvmtiVMObjectAllocEventCollector oam;
2956 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2957 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
2958 return (jstring) JNIHandles::make_local(THREAD, result);
2959 JVM_END
2960
2961
2962 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
2963 JvmtiVMObjectAllocEventCollector oam;
2964 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
2965 return (jobjectArray) JNIHandles::make_local(THREAD, result);
2966 JVM_END
2967
2968
2969 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
2970
2971
2972 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
2973 MonitorLocker ml(Heap_lock);
2974 oop ref = Universe::reference_pending_list();
2975 if (ref != nullptr) {
2976 Universe::clear_reference_pending_list();
2977 }
2978 return JNIHandles::make_local(THREAD, ref);
2979 JVM_END
2980
2981 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
2982 MonitorLocker ml(Heap_lock);
2983 return Universe::has_reference_pending_list();
2984 JVM_END
2985
2986 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
2987 MonitorLocker ml(Heap_lock);
2988 while (!Universe::has_reference_pending_list()) {
2989 ml.wait();
2990 }
2991 JVM_END
2992
2993 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
2994 oop ref_oop = JNIHandles::resolve_non_null(ref);
2995 // PhantomReference has its own implementation of get().
2996 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
2997 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
2998 return JNIHandles::make_local(THREAD, referent);
2999 JVM_END
3000
3001 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3002 oop ref_oop = JNIHandles::resolve_non_null(ref);
3003 // PhantomReference has its own implementation of refersTo().
3004 // See: JVM_PhantomReferenceRefersTo
3005 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3006 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3007 return referent == JNIHandles::resolve(o);
3008 JVM_END
3009
3010 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3011 oop ref_oop = JNIHandles::resolve_non_null(ref);
3012 // FinalReference has it's own implementation of clear().
3013 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3014 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3015 // If the referent has already been cleared then done.
3016 // However, if the referent is dead but has not yet been cleared by
3017 // concurrent reference processing, it should NOT be cleared here.
3018 // Instead, clearing should be left to the GC. Clearing it here could
3019 // detectably lose an expected notification, which is impossible with
3020 // STW reference processing. The clearing in enqueue() doesn't have
3021 // this problem, since the enqueue covers the notification, but it's not
3022 // worth the effort to handle that case specially.
3023 return;
3024 }
3025 java_lang_ref_Reference::clear_referent(ref_oop);
3026 JVM_END
3027
3028
3029 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3030
3031
3032 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3033 oop ref_oop = JNIHandles::resolve_non_null(ref);
3034 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3035 return referent == JNIHandles::resolve(o);
3036 JVM_END
3037
3038
3039 // ObjectInputStream ///////////////////////////////////////////////////////////////
3040
3041 // Return the first user-defined class loader up the execution stack, or null
3042 // if only code from the bootstrap or platform class loader is on the stack.
3043
3044 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3045 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3046 InstanceKlass* ik = vfst.method()->method_holder();
3047 oop loader = ik->class_loader();
3048 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3049 return JNIHandles::make_local(THREAD, loader);
3050 }
3051 }
3052 return nullptr;
3053 JVM_END
3054
3055
3056 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3057
3058
3059 // resolve array handle and check arguments
3060 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3061 if (arr == nullptr) {
3062 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3063 }
3064 oop a = JNIHandles::resolve_non_null(arr);
3065 if (!a->is_array()) {
3066 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3067 } else if (type_array_only && !a->is_typeArray()) {
3068 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3069 }
3070 return arrayOop(a);
3071 }
3072
3073
3074 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3075 arrayOop a = check_array(env, arr, false, CHECK_0);
3076 return a->length();
3077 JVM_END
3078
3079
3080 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3081 JvmtiVMObjectAllocEventCollector oam;
3082 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3083 jvalue value;
3084 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3085 oop box = Reflection::box(&value, type, CHECK_NULL);
3086 return JNIHandles::make_local(THREAD, box);
3087 JVM_END
3088
3089
3090 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3091 jvalue value;
3092 value.i = 0; // to initialize value before getting used in CHECK
3093 arrayOop a = check_array(env, arr, true, CHECK_(value));
3094 assert(a->is_typeArray(), "just checking");
3095 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3096 BasicType wide_type = (BasicType) wCode;
3097 if (type != wide_type) {
3098 Reflection::widen(&value, type, wide_type, CHECK_(value));
3099 }
3100 return value;
3101 JVM_END
3102
3103
3104 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3105 arrayOop a = check_array(env, arr, false, CHECK);
3106 oop box = JNIHandles::resolve(val);
3107 jvalue value;
3108 value.i = 0; // to initialize value before getting used in CHECK
3109 BasicType value_type;
3110 if (a->is_objArray()) {
3111 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3112 value_type = Reflection::unbox_for_regular_object(box, &value);
3113 } else {
3114 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3115 }
3116 Reflection::array_set(&value, a, index, value_type, CHECK);
3117 JVM_END
3118
3119
3120 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3121 arrayOop a = check_array(env, arr, true, CHECK);
3122 assert(a->is_typeArray(), "just checking");
3123 BasicType value_type = (BasicType) vCode;
3124 Reflection::array_set(&v, a, index, value_type, CHECK);
3125 JVM_END
3126
3127
3128 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3129 JvmtiVMObjectAllocEventCollector oam;
3130 oop element_mirror = JNIHandles::resolve(eltClass);
3131 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3132 return JNIHandles::make_local(THREAD, result);
3133 JVM_END
3134
3135
3136 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3137 JvmtiVMObjectAllocEventCollector oam;
3138 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3139 oop element_mirror = JNIHandles::resolve(eltClass);
3140 assert(dim_array->is_typeArray(), "just checking");
3141 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3142 return JNIHandles::make_local(THREAD, result);
3143 JVM_END
3144
3145
3146 // Library support ///////////////////////////////////////////////////////////////////////////
3147
3148 JVM_LEAF(void*, JVM_LoadZipLibrary())
3149 return ZipLibrary::handle();
3150 JVM_END
3151
3152 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3153 //%note jvm_ct
3154 char ebuf[1024];
3155 void *load_result;
3156 {
3157 ThreadToNativeFromVM ttnfvm(thread);
3158 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3159 }
3160 if (load_result == nullptr) {
3161 if (throwException) {
3162 char msg[1024];
3163 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3164 // Since 'ebuf' may contain a string encoded using
3165 // platform encoding scheme, we need to pass
3166 // Exceptions::unsafe_to_utf8 to the new_exception method
3167 // as the last argument. See bug 6367357.
3168 Handle h_exception =
3169 Exceptions::new_exception(thread,
3170 vmSymbols::java_lang_UnsatisfiedLinkError(),
3171 msg, Exceptions::unsafe_to_utf8);
3172
3173 THROW_HANDLE_NULL(h_exception);
3174 } else {
3175 log_info(library)("Failed to load library %s", name);
3176 return load_result;
3177 }
3178 }
3179 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3180 return load_result;
3181 JVM_END
3182
3183
3184 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3185 os::dll_unload(handle);
3186 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3187 JVM_END
3188
3189
3190 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3191 void* find_result = os::dll_lookup(handle, name);
3192 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3193 find_result != nullptr ? "Found" : "Failed to find",
3194 name, p2i(handle));
3195 return find_result;
3196 JVM_END
3197
3198
3199 // JNI version ///////////////////////////////////////////////////////////////////////////////
3200
3201 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3202 return Threads::is_supported_jni_version_including_1_1(version);
3203 JVM_END
3204
3205
3206 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3207 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3208 JVM_END
3209
3210 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3211 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3212 JVM_END
3213
3214 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3215 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3216 JVM_END
3217
3218 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3219 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3220 JVM_END
3221
3222 // String support ///////////////////////////////////////////////////////////////////////////
3223
3224 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3225 JvmtiVMObjectAllocEventCollector oam;
3226 if (str == nullptr) return nullptr;
3227 oop string = JNIHandles::resolve_non_null(str);
3228 oop result = StringTable::intern(string, CHECK_NULL);
3229 return (jstring) JNIHandles::make_local(THREAD, result);
3230 JVM_END
3231
3232
3233 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3234
3235 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3236 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3237 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3238 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3239 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3240 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3241
3242
3243 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3244 VM_Exit::block_if_vm_exited();
3245 return new PlatformMutex();
3246 }
3247
3248
3249 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3250 VM_Exit::block_if_vm_exited();
3251 delete ((PlatformMutex*) mon);
3252 }
3253
3254
3255 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3256 VM_Exit::block_if_vm_exited();
3257 ((PlatformMutex*) mon)->lock();
3258 return 0;
3259 }
3260
3261
3262 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3263 VM_Exit::block_if_vm_exited();
3264 ((PlatformMutex*) mon)->unlock();
3265 }
3266
3267
3268 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3269
3270 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3271 Handle loader, jboolean throwError, TRAPS) {
3272 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3273
3274 // Check if we should initialize the class
3275 if (init && klass->is_instance_klass()) {
3276 klass->initialize(CHECK_NULL);
3277 }
3278 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3279 }
3280
3281
3282 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3283
3284 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3285 Handle method_handle;
3286 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3287 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3288 Handle receiver(THREAD, JNIHandles::resolve(obj));
3289 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3290 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3291 jobject res = JNIHandles::make_local(THREAD, result);
3292 if (JvmtiExport::should_post_vm_object_alloc()) {
3293 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3294 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3295 if (java_lang_Class::is_primitive(ret_type)) {
3296 // Only for primitive type vm allocates memory for java object.
3297 // See box() method.
3298 JvmtiExport::post_vm_object_alloc(thread, result);
3299 }
3300 }
3301 return res;
3302 } else {
3303 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3304 }
3305 JVM_END
3306
3307
3308 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3309 oop constructor_mirror = JNIHandles::resolve(c);
3310 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3311 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3312 jobject res = JNIHandles::make_local(THREAD, result);
3313 if (JvmtiExport::should_post_vm_object_alloc()) {
3314 JvmtiExport::post_vm_object_alloc(thread, result);
3315 }
3316 return res;
3317 JVM_END
3318
3319 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3320 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3321 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3322 JVM_END
3323
3324 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3325 jclass caller,
3326 jstring interfaceMethodName,
3327 jobject factoryType,
3328 jobject interfaceMethodType,
3329 jobject implementationMember,
3330 jobject dynamicMethodType,
3331 jclass lambdaProxyClass))
3332 #if INCLUDE_CDS
3333 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3334 return;
3335 }
3336
3337 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3338 if (caller_ik->is_hidden()) {
3339 // Hidden classes not of type lambda proxy classes are currently not being archived.
3340 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3341 // registered for archiving.
3342 return;
3343 }
3344 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3345 assert(lambda_ik->is_hidden(), "must be a hidden class");
3346 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3347
3348 Symbol* interface_method_name = nullptr;
3349 if (interfaceMethodName != nullptr) {
3350 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3351 }
3352 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3353 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3354
3355 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3356 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3357
3358 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3359 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3360 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3361
3362 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3363 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3364
3365 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3366 interface_method_type, m, dynamic_method_type, THREAD);
3367 #endif // INCLUDE_CDS
3368 JVM_END
3369
3370 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3371 jclass caller,
3372 jstring interfaceMethodName,
3373 jobject factoryType,
3374 jobject interfaceMethodType,
3375 jobject implementationMember,
3376 jobject dynamicMethodType))
3377 #if INCLUDE_CDS
3378
3379 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3380 implementationMember == nullptr || dynamicMethodType == nullptr) {
3381 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3382 }
3383
3384 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3385 if (!caller_ik->in_aot_cache()) {
3386 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3387 return nullptr;
3388 }
3389
3390 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3391 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3392 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3393
3394 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3395 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3396
3397 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3398 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3399 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3400
3401 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3402 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3403
3404 InstanceKlass* loaded_lambda =
3405 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3406 interface_method_type, m, dynamic_method_type,
3407 CHECK_(nullptr));
3408 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3409 #else
3410 return nullptr;
3411 #endif // INCLUDE_CDS
3412 JVM_END
3413
3414 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3415 if (CDSConfig::is_dumping_static_archive()) {
3416 // We do this so that the default CDS archive can be deterministic.
3417 const char* release = VM_Version::vm_release();
3418 const char* dbg_level = VM_Version::jdk_debug_level();
3419 const char* version = VM_Version::internal_vm_info_string();
3420 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3421 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3422 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3423 seed += (jlong)VM_Version::vm_major_version();
3424 seed += (jlong)VM_Version::vm_minor_version();
3425 seed += (jlong)VM_Version::vm_security_version();
3426 seed += (jlong)VM_Version::vm_patch_version();
3427 if (seed == 0) { // don't let this ever be zero.
3428 seed = 0x87654321;
3429 }
3430 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3431 return seed;
3432 } else {
3433 return 0;
3434 }
3435 JVM_END
3436
3437 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3438 return CDSConfig::get_status();
3439 JVM_END
3440
3441 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3442 #if INCLUDE_CDS
3443 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3444 if (line != nullptr) {
3445 ResourceMark rm(THREAD);
3446 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3447 char* c_line = java_lang_String::as_utf8_string(h_line());
3448 if (CDSConfig::is_dumping_dynamic_archive()) {
3449 // Note: LambdaFormInvokers::append take same format which is not
3450 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3451 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3452 }
3453 if (ClassListWriter::is_enabled()) {
3454 ClassListWriter w;
3455 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3456 }
3457 }
3458 #endif // INCLUDE_CDS
3459 JVM_END
3460
3461 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3462 #if INCLUDE_CDS
3463 ResourceMark rm(THREAD);
3464 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3465 char* file_name = java_lang_String::as_utf8_string(file_handle());
3466 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3467 #endif // INCLUDE_CDS
3468 JVM_END
3469
3470 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3471 #if INCLUDE_CDS
3472 ResourceMark rm(THREAD);
3473 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3474 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3475 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3476 #endif // INCLUDE_CDS
3477 JVM_END
3478
3479 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3480 #if INCLUDE_CDS
3481 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3482 if (!k->is_instance_klass()) {
3483 return false;
3484 } else {
3485 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3486 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3487 // This class will be cached in AOT-initialized state. No need for init barriers.
3488 return false;
3489 } else {
3490 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3491 // must emit barriers to ensure class initialization during production run.
3492 ResourceMark rm(THREAD);
3493 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3494 return true;
3495 }
3496 }
3497 #else
3498 return false;
3499 #endif // INCLUDE_CDS
3500 JVM_END
3501
3502 // Returns an array of all live Thread objects (VM internal JavaThreads,
3503 // jvmti agent threads, and JNI attaching threads are skipped)
3504 // See CR 6404306 regarding JNI attaching threads
3505 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3506 ResourceMark rm(THREAD);
3507 ThreadsListEnumerator tle(THREAD, false, false);
3508 JvmtiVMObjectAllocEventCollector oam;
3509
3510 int num_threads = tle.num_threads();
3511 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3512 objArrayHandle threads_ah(THREAD, r);
3513
3514 for (int i = 0; i < num_threads; i++) {
3515 Handle h = tle.get_threadObj(i);
3516 threads_ah->obj_at_put(i, h());
3517 }
3518
3519 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3520 JVM_END
3521
3522
3523 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3524 // Return StackTraceElement[][], each element is the stack trace of a thread in
3525 // the corresponding entry in the given threads array
3526 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3527 JvmtiVMObjectAllocEventCollector oam;
3528
3529 // Check if threads is null
3530 if (threads == nullptr) {
3531 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3532 }
3533
3534 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3535 objArrayHandle ah(THREAD, a);
3536 int num_threads = ah->length();
3537 // check if threads is non-empty array
3538 if (num_threads == 0) {
3539 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3540 }
3541
3542 // check if threads is not an array of objects of Thread class
3543 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3544 if (k != vmClasses::Thread_klass()) {
3545 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3546 }
3547
3548 ResourceMark rm(THREAD);
3549
3550 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3551 for (int i = 0; i < num_threads; i++) {
3552 oop thread_obj = ah->obj_at(i);
3553 instanceHandle h(THREAD, (instanceOop) thread_obj);
3554 thread_handle_array->append(h);
3555 }
3556
3557 // The JavaThread references in thread_handle_array are validated
3558 // in VM_ThreadDump::doit().
3559 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3560 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3561
3562 JVM_END
3563
3564 // JVM monitoring and management support
3565 JVM_LEAF(void*, JVM_GetManagement(jint version))
3566 return Management::get_jmm_interface(version);
3567 JVM_END
3568
3569 // com.sun.tools.attach.VirtualMachine agent properties support
3570 //
3571 // Initialize the agent properties with the properties maintained in the VM
3572 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3573 ResourceMark rm;
3574
3575 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3576
3577 PUTPROP(props, "sun.java.command", Arguments::java_command());
3578 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3579 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3580 return properties;
3581 JVM_END
3582
3583 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3584 {
3585 JvmtiVMObjectAllocEventCollector oam;
3586
3587 if (ofClass == nullptr) {
3588 return nullptr;
3589 }
3590 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3591 // Special handling for primitive objects
3592 if (java_lang_Class::is_primitive(mirror())) {
3593 return nullptr;
3594 }
3595 Klass* k = java_lang_Class::as_Klass(mirror());
3596 if (!k->is_instance_klass()) {
3597 return nullptr;
3598 }
3599 InstanceKlass* ik = InstanceKlass::cast(k);
3600 int encl_method_class_idx = ik->enclosing_method_class_index();
3601 if (encl_method_class_idx == 0) {
3602 return nullptr;
3603 }
3604 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3605 objArrayHandle dest(THREAD, dest_o);
3606 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3607 dest->obj_at_put(0, enc_k->java_mirror());
3608 int encl_method_method_idx = ik->enclosing_method_method_index();
3609 if (encl_method_method_idx != 0) {
3610 Symbol* sym = ik->constants()->symbol_at(
3611 extract_low_short_from_int(
3612 ik->constants()->name_and_type_at(encl_method_method_idx)));
3613 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3614 dest->obj_at_put(1, str());
3615 sym = ik->constants()->symbol_at(
3616 extract_high_short_from_int(
3617 ik->constants()->name_and_type_at(encl_method_method_idx)));
3618 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3619 dest->obj_at_put(2, str());
3620 }
3621 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3622 }
3623 JVM_END
3624
3625 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3626 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3627 ResourceMark rm(THREAD);
3628
3629 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3630 return nullptr;
3631 }
3632
3633 char** vm_flags = Arguments::jvm_flags_array();
3634 char** vm_args = Arguments::jvm_args_array();
3635 int num_flags = Arguments::num_jvm_flags();
3636 int num_args = Arguments::num_jvm_args();
3637
3638 InstanceKlass* ik = vmClasses::String_klass();
3639 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3640 objArrayHandle result_h(THREAD, r);
3641
3642 int index = 0;
3643 for (int j = 0; j < num_flags; j++, index++) {
3644 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], 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