1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/aotMetaspace.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/classListParser.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/dynamicArchive.hpp"
31 #include "cds/heapShared.hpp"
32 #include "cds/lambdaFormInvokers.hpp"
33 #include "cds/lambdaProxyClassDictionary.hpp"
34 #include "classfile/classFileStream.hpp"
35 #include "classfile/classLoader.inline.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/method.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "oops/recordComponent.hpp"
68 #include "prims/foreignGlobals.hpp"
69 #include "prims/jvm_misc.hpp"
70 #include "prims/jvmtiExport.hpp"
71 #include "prims/jvmtiThreadState.inline.hpp"
72 #include "prims/stackwalk.hpp"
73 #include "runtime/arguments.hpp"
74 #include "runtime/atomicAccess.hpp"
75 #include "runtime/continuation.hpp"
76 #include "runtime/deoptimization.hpp"
77 #include "runtime/globals_extension.hpp"
78 #include "runtime/handles.inline.hpp"
79 #include "runtime/handshake.hpp"
80 #include "runtime/init.hpp"
81 #include "runtime/interfaceSupport.inline.hpp"
82 #include "runtime/java.hpp"
83 #include "runtime/javaCalls.hpp"
84 #include "runtime/javaThread.hpp"
85 #include "runtime/jfieldIDWorkaround.hpp"
86 #include "runtime/jniHandles.inline.hpp"
87 #include "runtime/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 #ifdef LINUX
119 #include "osContainer_linux.hpp"
120 #endif
121
122 #include <errno.h>
123
124 /*
125 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
126 such ctors and calls MUST NOT come between an oop declaration/init and its
127 usage because if objects are move this may cause various memory stomps, bus
128 errors and segfaults. Here is a cookbook for causing so called "naked oop
129 failures":
130
131 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
132 // Object address to be held directly in mirror & not visible to GC
133 oop mirror = JNIHandles::resolve_non_null(ofClass);
134
135 // If this ctor can hit a safepoint, moving objects around, then
136 ComplexConstructor foo;
137
138 // Boom! mirror may point to JUNK instead of the intended object
139 (some dereference of mirror)
140
141 // Here's another call that may block for GC, making mirror stale
142 MutexLocker ml(some_lock);
143
144 // And here's an initializer that can result in a stale oop
145 // all in one step.
146 oop o = call_that_can_throw_exception(TRAPS);
147
148
149 The solution is to keep the oop declaration BELOW the ctor or function
150 call that might cause a GC, do another resolve to reassign the oop, or
151 consider use of a Handle instead of an oop so there is immunity from object
152 motion. But note that the "QUICK" entries below do not have a handlemark
153 and thus can only support use of handles passed in.
154 */
155
156 extern void trace_class_resolution(Klass* to_class) {
157 ResourceMark rm;
158 int line_number = -1;
159 const char * source_file = nullptr;
160 const char * trace = "explicit";
161 InstanceKlass* caller = nullptr;
162 JavaThread* jthread = JavaThread::current();
163 if (jthread->has_last_Java_frame()) {
164 vframeStream vfst(jthread);
165
166 // Scan up the stack skipping ClassLoader frames.
167 Method* last_caller = nullptr;
168
169 while (!vfst.at_end()) {
170 Method* m = vfst.method();
171 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
172 break;
173 }
174 last_caller = m;
175 vfst.next();
176 }
177 // if this is called from Class.forName0 and that is called from Class.forName,
178 // then print the caller of Class.forName. If this is Class.loadClass, then print
179 // that caller, otherwise keep quiet since this should be picked up elsewhere.
180 bool found_it = false;
181 if (!vfst.at_end() &&
182 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
183 vfst.method()->name() == vmSymbols::forName0_name()) {
184 vfst.next();
185 if (!vfst.at_end() &&
186 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
187 vfst.method()->name() == vmSymbols::forName_name()) {
188 vfst.next();
189 found_it = true;
190 }
191 } else if (last_caller != nullptr &&
192 last_caller->method_holder()->name() ==
193 vmSymbols::java_lang_ClassLoader() &&
194 last_caller->name() == vmSymbols::loadClass_name()) {
195 found_it = true;
196 } else if (!vfst.at_end()) {
197 if (vfst.method()->is_native()) {
198 // JNI call
199 found_it = true;
200 }
201 }
202 if (found_it && !vfst.at_end()) {
203 // found the caller
204 caller = vfst.method()->method_holder();
205 line_number = vfst.method()->line_number_from_bci(vfst.bci());
206 if (line_number == -1) {
207 // show method name if it's a native method
208 trace = vfst.method()->name_and_sig_as_C_string();
209 }
210 Symbol* s = caller->source_file_name();
211 if (s != nullptr) {
212 source_file = s->as_C_string();
213 }
214 }
215 }
216 if (caller != nullptr) {
217 if (to_class != caller) {
218 const char * from = caller->external_name();
219 const char * to = to_class->external_name();
220 // print in a single call to reduce interleaving between threads
221 if (source_file != nullptr) {
222 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
223 } else {
224 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
225 }
226 }
227 }
228 }
229
230 // java.lang.System //////////////////////////////////////////////////////////////////////
231
232 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env))
233 #if INCLUDE_CDS
234 if (CDSConfig::is_dumping_preimage_static_archive()) {
235 if (!AOTMetaspace::preimage_static_archive_dumped()) {
236 AOTMetaspace::dump_static_archive(THREAD);
237 return JNI_TRUE;
238 }
239 }
240 return JNI_FALSE;
241 #else
242 return JNI_FALSE;
243 #endif // INCLUDE_CDS
244 JVM_END
245
246 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
247 return os::javaTimeMillis();
248 JVM_END
249
250 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
251 return os::javaTimeNanos();
252 JVM_END
253
254 // The function below is actually exposed by jdk.internal.misc.VM and not
255 // java.lang.System, but we choose to keep it here so that it stays next
256 // to JVM_CurrentTimeMillis and JVM_NanoTime
257
258 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
259 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
260
261 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
262 jlong seconds;
263 jlong nanos;
264
265 os::javaTimeSystemUTC(seconds, nanos);
266
267 // We're going to verify that the result can fit in a long.
268 // For that we need the difference in seconds between 'seconds'
269 // and 'offset_secs' to be such that:
270 // |seconds - offset_secs| < (2^63/10^9)
271 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
272 // which makes |seconds - offset_secs| < 2^33
273 // and we will prefer +/- 2^32 as the maximum acceptable diff
274 // as 2^32 has a more natural feel than 2^33...
275 //
276 // So if |seconds - offset_secs| >= 2^32 - we return a special
277 // sentinel value (-1) which the caller should take as an
278 // exception value indicating that the offset given to us is
279 // too far from range of the current time - leading to too big
280 // a nano adjustment. The caller is expected to recover by
281 // computing a more accurate offset and calling this method
282 // again. (For the record 2^32 secs is ~136 years, so that
283 // should rarely happen)
284 //
285 jlong diff = seconds - offset_secs;
286 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
287 return -1; // sentinel value: the offset is too far off the target
288 }
289
290 // return the adjustment. If you compute a time by adding
291 // this number of nanoseconds along with the number of seconds
292 // in the offset you should get the current UTC time.
293 return (diff * (jlong)1000000000) + nanos;
294 JVM_END
295
296 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
297 jobject dst, jint dst_pos, jint length))
298 // Check if we have null pointers
299 if (src == nullptr || dst == nullptr) {
300 THROW(vmSymbols::java_lang_NullPointerException());
301 }
302 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
303 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
304 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
305 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
306 // Do copy
307 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
308 JVM_END
309
310
311 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
312 JavaValue r(T_OBJECT);
313 // public synchronized Object put(Object key, Object value);
314 HandleMark hm(THREAD);
315 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
316 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
317 JavaCalls::call_virtual(&r,
318 props,
319 vmClasses::Properties_klass(),
320 vmSymbols::put_name(),
321 vmSymbols::object_object_object_signature(),
322 key_str,
323 value_str,
324 THREAD);
325 }
326
327
328 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
329
330 /*
331 * Return all of the system properties in a Java String array with alternating
332 * names and values from the jvm SystemProperty.
333 * Which includes some internal and all commandline -D defined properties.
334 */
335 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
336 ResourceMark rm(THREAD);
337 HandleMark hm(THREAD);
338 int ndx = 0;
339 int fixedCount = 2;
340
341 SystemProperty* p = Arguments::system_properties();
342 int count = Arguments::PropertyList_count(p);
343
344 // Allocate result String array
345 InstanceKlass* ik = vmClasses::String_klass();
346 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
347 objArrayHandle result_h(THREAD, r);
348
349 while (p != nullptr) {
350 const char * key = p->key();
351 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
352 const char * value = p->value();
353 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
354 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
355 result_h->obj_at_put(ndx * 2, key_str());
356 result_h->obj_at_put(ndx * 2 + 1, value_str());
357 ndx++;
358 }
359 p = p->next();
360 }
361
362 // Convert the -XX:MaxDirectMemorySize= command line flag
363 // to the sun.nio.MaxDirectMemorySize property.
364 // Do this after setting user properties to prevent people
365 // from setting the value with a -D option, as requested.
366 // Leave empty if not supplied
367 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
368 char as_chars[256];
369 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
370 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
371 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
372 result_h->obj_at_put(ndx * 2, key_str());
373 result_h->obj_at_put(ndx * 2 + 1, value_str());
374 ndx++;
375 }
376
377 // JVM monitoring and management support
378 // Add the sun.management.compiler property for the compiler's name
379 {
380 #undef CSIZE
381 #if defined(_LP64)
382 #define CSIZE "64-Bit "
383 #else
384 #define CSIZE
385 #endif // 64bit
386
387 #if COMPILER1_AND_COMPILER2
388 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
389 #else
390 #if defined(COMPILER1)
391 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
392 #elif defined(COMPILER2)
393 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
394 #elif INCLUDE_JVMCI
395 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
396 #else
397 const char* compiler_name = "";
398 #endif // compilers
399 #endif // COMPILER1_AND_COMPILER2
400
401 if (*compiler_name != '\0' &&
402 (Arguments::mode() != Arguments::_int)) {
403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
404 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
405 result_h->obj_at_put(ndx * 2, key_str());
406 result_h->obj_at_put(ndx * 2 + 1, value_str());
407 ndx++;
408 }
409 }
410
411 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
412 JVM_END
413
414
415 /*
416 * Return the temporary directory that the VM uses for the attach
417 * and perf data files.
418 *
419 * It is important that this directory is well-known and the
420 * same for all VM instances. It cannot be affected by configuration
421 * variables such as java.io.tmpdir.
422 */
423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
424 HandleMark hm(THREAD);
425 const char* temp_dir = os::get_temp_directory();
426 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
427 return (jstring) JNIHandles::make_local(THREAD, h());
428 JVM_END
429
430
431 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
432
433 extern volatile jint vm_created;
434
435 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
436 EventShutdown event;
437 if (event.should_commit()) {
438 event.set_reason("Shutdown requested from Java");
439 event.commit();
440 }
441 JVM_END
442
443
444 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
445 before_exit(thread, true);
446 vm_exit(code);
447 JVM_END
448
449
450 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
451 if (!DisableExplicitGC) {
452 EventSystemGC event;
453 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
454 Universe::heap()->collect(GCCause::_java_lang_system_gc);
455 event.commit();
456 }
457 JVM_END
458
459
460 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
461 return Universe::heap()->millis_since_last_whole_heap_examined();
462 JVM_END
463
464
465 static inline jlong convert_size_t_to_jlong(size_t val) {
466 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
467 NOT_LP64 (return (jlong)val;)
468 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
469 }
470
471 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
472 size_t n = Universe::heap()->capacity();
473 return convert_size_t_to_jlong(n);
474 JVM_END
475
476
477 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
478 size_t n = Universe::heap()->unused();
479 return convert_size_t_to_jlong(n);
480 JVM_END
481
482
483 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
484 size_t n = Universe::heap()->max_capacity();
485 return convert_size_t_to_jlong(n);
486 JVM_END
487
488
489 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
490 return os::active_processor_count();
491 JVM_END
492
493 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
494 #ifdef LINUX
495 if (UseContainerSupport) {
496 return JNI_TRUE;
497 }
498 #endif
499 return JNI_FALSE;
500 JVM_END
501
502 JVM_LEAF(jboolean, JVM_IsContainerized(void))
503 #ifdef LINUX
504 if (OSContainer::is_containerized()) {
505 return JNI_TRUE;
506 }
507 #endif
508 return JNI_FALSE;
509 JVM_END
510
511 // java.lang.Throwable //////////////////////////////////////////////////////
512
513 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
514 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
515 java_lang_Throwable::fill_in_stack_trace(exception);
516 JVM_END
517
518 // java.lang.NullPointerException ///////////////////////////////////////////
519
520 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
521 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
522
523 oop exc = JNIHandles::resolve_non_null(throwable);
524
525 Method* method;
526 int bci;
527 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
528 return nullptr;
529 }
530 if (method->is_native()) {
531 return nullptr;
532 }
533
534 stringStream ss;
535 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
536 if (ok) {
537 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
538 return (jstring) JNIHandles::make_local(THREAD, result);
539 } else {
540 return nullptr;
541 }
542 JVM_END
543
544 // java.lang.StackTraceElement //////////////////////////////////////////////
545
546
547 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
548 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
549 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
550 objArrayHandle stack_trace(THREAD, st);
551 // Fill in the allocated stack trace
552 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
553 JVM_END
554
555
556 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
557 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
558 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
559 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
560 JVM_END
561
562
563 // java.lang.StackWalker //////////////////////////////////////////////////////
564 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
565 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
566
567 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
568 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
569 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
570 if (!have_name) {
571 oop name = StringTable::intern(method->name(), CHECK);
572 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
573 }
574 if (!have_type) {
575 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
576 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
577 }
578 JVM_END
579
580 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
581 jint skip_frames, jobject contScope, jobject cont,
582 jint buffer_size, jint start_index, jobjectArray frames))
583 if (!thread->has_last_Java_frame()) {
584 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
585 }
586
587 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
588 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
589 Handle cont_h(THREAD, JNIHandles::resolve(cont));
590 // frames array is a ClassFrameInfo[] array when only getting caller reference,
591 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
592 // be null.
593 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
594 objArrayHandle frames_array_h(THREAD, fa);
595
596 if (frames_array_h->length() < buffer_size) {
597 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
598 }
599
600 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
601 buffer_size, start_index, frames_array_h, CHECK_NULL);
602 return JNIHandles::make_local(THREAD, result);
603 JVM_END
604
605
606 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
607 jint last_batch_count, jint buffer_size, jint start_index,
608 jobjectArray frames))
609 // frames array is a ClassFrameInfo[] array when only getting caller reference,
610 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
611 // be null.
612 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
613 objArrayHandle frames_array_h(THREAD, fa);
614
615 if (frames_array_h->length() < buffer_size) {
616 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
617 }
618
619 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
620 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
621 start_index, frames_array_h, THREAD);
622 JVM_END
623
624 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
625 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
626 objArrayHandle frames_array_h(THREAD, fa);
627 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
628 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
629
630 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
631 JVM_END
632
633 // java.lang.Object ///////////////////////////////////////////////
634
635
636 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
637 // as implemented in the classic virtual machine; return 0 if object is null
638 return handle == nullptr ? 0 :
639 checked_cast<jint>(ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)));
640 JVM_END
641
642
643 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
644 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
645 ObjectSynchronizer::wait(obj, ms, CHECK);
646 JVM_END
647
648
649 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
650 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
651 ObjectSynchronizer::notify(obj, CHECK);
652 JVM_END
653
654
655 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
656 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
657 ObjectSynchronizer::notifyall(obj, CHECK);
658 JVM_END
659
660
661 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
662 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
663 Klass* klass = obj->klass();
664 JvmtiVMObjectAllocEventCollector oam;
665
666 #ifdef ASSERT
667 // Just checking that the cloneable flag is set correct
668 if (obj->is_array()) {
669 guarantee(klass->is_cloneable(), "all arrays are cloneable");
670 } else {
671 guarantee(obj->is_instance(), "should be instanceOop");
672 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
673 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
674 }
675 #endif
676
677 // Check if class of obj supports the Cloneable interface.
678 // All arrays are considered to be cloneable (See JLS 20.1.5).
679 // All j.l.r.Reference classes are considered non-cloneable.
680 if (!klass->is_cloneable() ||
681 (klass->is_instance_klass() &&
682 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
683 ResourceMark rm(THREAD);
684 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
685 }
686
687 // Make shallow object copy
688 const size_t size = obj->size();
689 oop new_obj_oop = nullptr;
690 if (obj->is_array()) {
691 const int length = ((arrayOop)obj())->length();
692 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
693 /* do_zero */ true, CHECK_NULL);
694 } else {
695 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
696 }
697
698 HeapAccess<>::clone(obj(), new_obj_oop, size);
699
700 Handle new_obj(THREAD, new_obj_oop);
701 // Caution: this involves a java upcall, so the clone should be
702 // "gc-robust" by this stage.
703 if (klass->has_finalizer()) {
704 assert(obj->is_instance(), "should be instanceOop");
705 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
706 new_obj = Handle(THREAD, new_obj_oop);
707 }
708
709 return JNIHandles::make_local(THREAD, new_obj());
710 JVM_END
711
712 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
713
714 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
715 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
716 JVM_END
717
718 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
719 return InstanceKlass::is_finalization_enabled();
720 JVM_END
721
722 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
723
724 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
725 CONT_RegisterNativeMethods(env, cls);
726 JVM_END
727
728 // java.io.File ///////////////////////////////////////////////////////////////
729
730 JVM_LEAF(char*, JVM_NativePath(char* path))
731 return os::native_path(path);
732 JVM_END
733
734
735 // Misc. class handling ///////////////////////////////////////////////////////////
736
737
738 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
739 // Getting the class of the caller frame.
740 //
741 // The call stack at this point looks something like this:
742 //
743 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
744 // [1] [ @CallerSensitive API.method ]
745 // [.] [ (skipped intermediate frames) ]
746 // [n] [ caller ]
747 vframeStream vfst(thread);
748 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
749 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
750 Method* m = vfst.method();
751 assert(m != nullptr, "sanity");
752 switch (n) {
753 case 0:
754 // This must only be called from Reflection.getCallerClass
755 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
756 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
757 }
758 // fall-through
759 case 1:
760 // Frame 0 and 1 must be caller sensitive.
761 if (!m->caller_sensitive()) {
762 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
763 }
764 break;
765 default:
766 if (!m->is_ignored_by_security_stack_walk()) {
767 // We have reached the desired frame; return the holder class.
768 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
769 }
770 break;
771 }
772 }
773 return nullptr;
774 JVM_END
775
776
777 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
778 oop mirror = nullptr;
779 BasicType t = name2type(utf);
780 if (t != T_ILLEGAL && !is_reference_type(t)) {
781 mirror = Universe::java_mirror(t);
782 }
783 if (mirror == nullptr) {
784 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
785 } else {
786 return (jclass) JNIHandles::make_local(THREAD, mirror);
787 }
788 JVM_END
789
790
791 // Returns a class loaded by the bootstrap class loader; or null
792 // if not found. ClassNotFoundException is not thrown.
793 // FindClassFromBootLoader is exported to the launcher for windows.
794 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
795 const char* name))
796 // Java libraries should ensure that name is never null or illegal.
797 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
798 // It's impossible to create this class; the name cannot fit
799 // into the constant pool.
800 return nullptr;
801 }
802 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
803
804 TempNewSymbol h_name = SymbolTable::new_symbol(name);
805 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
806 if (k == nullptr) {
807 return nullptr;
808 }
809
810 if (log_is_enabled(Debug, class, resolve)) {
811 trace_class_resolution(k);
812 }
813 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
814 JVM_END
815
816 // Find a class with this name in this loader.
817 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
818 jboolean init, jobject loader))
819 TempNewSymbol h_name =
820 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
821 CHECK_NULL);
822
823 oop loader_oop = JNIHandles::resolve(loader);
824 Handle h_loader(THREAD, loader_oop);
825
826 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
827 false, THREAD);
828
829 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
830 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
831 }
832 return result;
833 JVM_END
834
835 // Currently only called from the old verifier.
836 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
837 jboolean init, jclass from))
838 TempNewSymbol h_name =
839 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
840 CHECK_NULL);
841 oop from_class_oop = JNIHandles::resolve(from);
842 assert(from_class_oop != nullptr, "must be");
843 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
844 assert(from_class != nullptr, "must be");
845 oop class_loader = from_class->class_loader();
846
847 Handle h_loader(THREAD, class_loader);
848 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
849
850 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
851 // this function is generally only used for class loading during verification.
852 ResourceMark rm;
853 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
854 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
855 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
856 }
857
858 #if INCLUDE_CDS
859 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
860 InstanceKlass* ik = InstanceKlass::cast(from_class);
861 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
862 }
863 #endif
864
865 return result;
866 JVM_END
867
868 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
869 static jclass jvm_define_class_common(const char *name,
870 jobject loader, const jbyte *buf,
871 jsize len, jobject pd, const char *source,
872 TRAPS) {
873 if (source == nullptr) source = "__JVM_DefineClass__";
874
875 JavaThread* jt = THREAD;
876
877 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
878 ClassLoader::perf_define_appclass_selftime(),
879 ClassLoader::perf_define_appclasses(),
880 jt->get_thread_stat()->perf_recursion_counts_addr(),
881 jt->get_thread_stat()->perf_timers_addr(),
882 PerfClassTraceTime::DEFINE_CLASS);
883
884 if (UsePerfData) {
885 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
886 }
887
888 // Class resolution will get the class name from the .class stream if the name is null.
889 TempNewSymbol class_name = name == nullptr ? nullptr :
890 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
891 CHECK_NULL);
892
893 ResourceMark rm(THREAD);
894 ClassFileStream st((u1*)buf, len, source);
895 Handle class_loader (THREAD, JNIHandles::resolve(loader));
896 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
897 ClassLoadInfo cl_info(protection_domain);
898 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
899 class_loader,
900 cl_info,
901 CHECK_NULL);
902
903 if (log_is_enabled(Debug, class, resolve)) {
904 trace_class_resolution(k);
905 }
906
907 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
908 }
909
910 enum {
911 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
912 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
913 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
914 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
915 };
916
917 /*
918 * Define a class with the specified flags that indicates if it's a nestmate,
919 * hidden, or strongly referenced from class loader.
920 */
921 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
922 const jbyte *buf, jsize len, jobject pd,
923 jboolean init, int flags, jobject classData, TRAPS) {
924 ResourceMark rm(THREAD);
925
926 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
927 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
928 if (lookup_k == nullptr) {
929 // The error message is wrong. We come here only if lookup is a primitive class
930 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
931 }
932
933 Handle class_loader (THREAD, lookup_k->class_loader());
934
935 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
936 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
937 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
938 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
939
940 InstanceKlass* host_class = nullptr;
941 if (is_nestmate) {
942 host_class = lookup_k->nest_host(CHECK_NULL);
943 }
944
945 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
946 name,
947 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
948 is_nestmate ? host_class->external_name() : "",
949 is_hidden ? "hidden" : "not hidden",
950 is_strong ? "strong" : "weak",
951 vm_annotations ? "with vm annotations" : "without vm annotation");
952
953 if (!is_hidden) {
954 // classData is only applicable for hidden classes
955 if (classData != nullptr) {
956 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
957 }
958 if (is_nestmate) {
959 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
960 }
961 if (!is_strong) {
962 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
963 }
964 if (vm_annotations) {
965 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
966 }
967 if (flags != STRONG_LOADER_LINK) {
968 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
969 err_msg("invalid flag 0x%x", flags));
970 }
971 }
972
973 // Class resolution will get the class name from the .class stream if the name is null.
974 TempNewSymbol class_name = name == nullptr ? nullptr :
975 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
976 CHECK_NULL);
977
978 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
979 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
980 ClassFileStream st((u1*)buf, len, source);
981
982 InstanceKlass* ik = nullptr;
983 if (!is_hidden) {
984 ClassLoadInfo cl_info(protection_domain);
985 ik = SystemDictionary::resolve_from_stream(&st, class_name,
986 class_loader,
987 cl_info,
988 CHECK_NULL);
989
990 if (log_is_enabled(Debug, class, resolve)) {
991 trace_class_resolution(ik);
992 }
993 } else { // hidden
994 Handle classData_h(THREAD, JNIHandles::resolve(classData));
995 ClassLoadInfo cl_info(protection_domain,
996 host_class,
997 classData_h,
998 is_hidden,
999 is_strong,
1000 vm_annotations);
1001 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1002 class_loader,
1003 cl_info,
1004 CHECK_NULL);
1005
1006 // The hidden class loader data has been artificially been kept alive to
1007 // this point. The mirror and any instances of this class have to keep
1008 // it alive afterwards.
1009 ik->class_loader_data()->dec_keep_alive_ref_count();
1010
1011 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1012 ModuleEntry* module = ik->module();
1013 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1014 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1015 module_name,
1016 ik->external_name(),
1017 host_class->external_name(),
1018 ik->is_hidden() ? "is hidden" : "is not hidden");
1019 }
1020 }
1021
1022 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1023 // non-hidden class or nestmate class must be in the same package as the Lookup class
1024 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1025 }
1026
1027 if (init) {
1028 ik->initialize(CHECK_NULL);
1029 } else {
1030 ik->link_class(CHECK_NULL);
1031 }
1032
1033 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1034 }
1035
1036 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1037 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1038 JVM_END
1039
1040 /*
1041 * Define a class with the specified lookup class.
1042 * lookup: Lookup class
1043 * name: the name of the class
1044 * buf: class bytes
1045 * len: length of class bytes
1046 * pd: protection domain
1047 * init: initialize the class
1048 * flags: properties of the class
1049 * classData: private static pre-initialized field
1050 */
1051 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1052 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1053
1054 if (lookup == nullptr) {
1055 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1056 }
1057
1058 assert(buf != nullptr, "buf must not be null");
1059
1060 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1061 JVM_END
1062
1063 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1064
1065 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1066 JVM_END
1067
1068 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1069 ResourceMark rm(THREAD);
1070
1071 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1072 char* str = java_lang_String::as_utf8_string(h_name());
1073
1074 // Sanity check, don't expect null
1075 if (str == nullptr) return nullptr;
1076
1077 // Internalize the string, converting '.' to '/' in string.
1078 char* p = (char*)str;
1079 while (*p != '\0') {
1080 if (*p == '.') {
1081 *p = '/';
1082 }
1083 p++;
1084 }
1085
1086 const int str_len = (int)(p - str);
1087 if (str_len > Symbol::max_length()) {
1088 // It's impossible to create this class; the name cannot fit
1089 // into the constant pool.
1090 return nullptr;
1091 }
1092 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1093
1094 // Security Note:
1095 // The Java level wrapper will perform the necessary security check allowing
1096 // us to pass the null as the initiating class loader.
1097 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1098 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1099 #if INCLUDE_CDS
1100 if (k == nullptr) {
1101 // If the class is not already loaded, try to see if it's in the shared
1102 // archive for the current classloader (h_loader).
1103 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1104 }
1105 #endif
1106 return (k == nullptr) ? nullptr :
1107 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1108 JVM_END
1109
1110 // Module support //////////////////////////////////////////////////////////////////////////////
1111
1112 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1113 jstring location, jobjectArray packages))
1114 Handle h_module (THREAD, JNIHandles::resolve(module));
1115 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1116 JVM_END
1117
1118 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1119 Handle h_module (THREAD, JNIHandles::resolve(module));
1120 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1121 JVM_END
1122
1123 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1124 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1125 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1126 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1127 JVM_END
1128
1129 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1130 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1131 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1132 JVM_END
1133
1134 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1135 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1136 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1137 JVM_END
1138
1139 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1140 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1141 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1142 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1143 JVM_END
1144
1145 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1146 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1147 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1148 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1149 JVM_END
1150
1151 // Reflection support //////////////////////////////////////////////////////////////////////////////
1152
1153 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1154 assert (cls != nullptr, "illegal class");
1155 JvmtiVMObjectAllocEventCollector oam;
1156 ResourceMark rm(THREAD);
1157 HandleMark hm(THREAD);
1158 Handle java_class(THREAD, JNIHandles::resolve(cls));
1159 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1160 return (jstring) JNIHandles::make_local(THREAD, result);
1161 JVM_END
1162
1163
1164 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1165 JvmtiVMObjectAllocEventCollector oam;
1166 oop mirror = JNIHandles::resolve_non_null(cls);
1167
1168 // Special handling for primitive objects
1169 if (java_lang_Class::is_primitive(mirror)) {
1170 // Primitive objects does not have any interfaces
1171 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1172 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1173 }
1174
1175 Klass* klass = java_lang_Class::as_Klass(mirror);
1176 // Figure size of result array
1177 int size;
1178 if (klass->is_instance_klass()) {
1179 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1180 } else {
1181 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1182 size = 2;
1183 }
1184
1185 // Allocate result array
1186 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1187 objArrayHandle result (THREAD, r);
1188 // Fill in result
1189 if (klass->is_instance_klass()) {
1190 // Regular instance klass, fill in all local interfaces
1191 for (int index = 0; index < size; index++) {
1192 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1193 result->obj_at_put(index, k->java_mirror());
1194 }
1195 } else {
1196 // All arrays implement java.lang.Cloneable and java.io.Serializable
1197 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1198 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1199 }
1200 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1201 JVM_END
1202
1203
1204 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1205 oop mirror = JNIHandles::resolve_non_null(cls);
1206 if (java_lang_Class::is_primitive(mirror)) {
1207 return JNI_FALSE;
1208 }
1209 Klass* k = java_lang_Class::as_Klass(mirror);
1210 return k->is_hidden();
1211 JVM_END
1212
1213
1214 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1215 ResourceMark rm(THREAD);
1216 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1217 JvmtiVMObjectAllocEventCollector oam;
1218
1219 // Iterate through Java frames
1220 vframeStream vfst(thread);
1221 for(; !vfst.at_end(); vfst.next()) {
1222 int loc = -1;
1223 // get method of frame
1224 Method* method = vfst.method();
1225
1226 Symbol *name = method->name();
1227
1228 InstanceKlass* holder = method->method_holder();
1229 if (name == vmSymbols::runWith_method_name()) {
1230 if (holder == vmClasses::Thread_klass()
1231 || holder == vmClasses::ScopedValue_Carrier_klass()) {
1232 loc = 1;
1233 }
1234 }
1235
1236 if (loc != -1) {
1237 javaVFrame *frame = vfst.asJavaVFrame();
1238 StackValueCollection* locals = frame->locals();
1239 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1240 Handle result = head_sv->get_obj();
1241 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1242 if (result() != nullptr) {
1243 return JNIHandles::make_local(THREAD, result());
1244 }
1245 }
1246 }
1247
1248 return nullptr;
1249 JVM_END
1250
1251 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1252 JvmtiVMObjectAllocEventCollector oam;
1253 // ofClass is a reference to a java_lang_Class object. The mirror object
1254 // of an InstanceKlass
1255 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1256 if (java_lang_Class::is_primitive(ofMirror) ||
1257 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1258 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1259 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1260 }
1261
1262 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1263 InnerClassesIterator iter(k);
1264
1265 if (iter.length() == 0) {
1266 // Neither an inner nor outer class
1267 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1268 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1269 }
1270
1271 // find inner class info
1272 constantPoolHandle cp(thread, k->constants());
1273 int length = iter.length();
1274
1275 // Allocate temp. result array
1276 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1277 objArrayHandle result (THREAD, r);
1278 int members = 0;
1279
1280 for (; !iter.done(); iter.next()) {
1281 int ioff = iter.inner_class_info_index();
1282 int ooff = iter.outer_class_info_index();
1283
1284 if (ioff != 0 && ooff != 0) {
1285 // Check to see if the name matches the class we're looking for
1286 // before attempting to find the class.
1287 if (cp->klass_name_at_matches(k, ooff)) {
1288 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1289 if (outer_klass == k) {
1290 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1291 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1292
1293 // Throws an exception if outer klass has not declared k as
1294 // an inner klass
1295 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1296
1297 result->obj_at_put(members, inner_klass->java_mirror());
1298 members++;
1299 }
1300 }
1301 }
1302 }
1303
1304 if (members != length) {
1305 // Return array of right length
1306 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1307 for(int i = 0; i < members; i++) {
1308 res->obj_at_put(i, result->obj_at(i));
1309 }
1310 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1311 }
1312
1313 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1314 JVM_END
1315
1316
1317 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1318 {
1319 // ofClass is a reference to a java_lang_Class object.
1320 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1321 if (java_lang_Class::is_primitive(ofMirror)) {
1322 return nullptr;
1323 }
1324 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1325 if (!klass->is_instance_klass()) {
1326 return nullptr;
1327 }
1328
1329 bool inner_is_member = false;
1330 Klass* outer_klass
1331 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1332 if (outer_klass == nullptr) return nullptr; // already a top-level class
1333 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1334 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1335 }
1336 JVM_END
1337
1338 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1339 {
1340 oop mirror = JNIHandles::resolve_non_null(cls);
1341 if (java_lang_Class::is_primitive(mirror)) {
1342 return nullptr;
1343 }
1344 Klass* klass = java_lang_Class::as_Klass(mirror);
1345 if (!klass->is_instance_klass()) {
1346 return nullptr;
1347 }
1348 InstanceKlass* k = InstanceKlass::cast(klass);
1349 int ooff = 0, noff = 0;
1350 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1351 if (noff != 0) {
1352 constantPoolHandle i_cp(thread, k->constants());
1353 Symbol* name = i_cp->symbol_at(noff);
1354 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1355 return (jstring) JNIHandles::make_local(THREAD, str());
1356 }
1357 }
1358 return nullptr;
1359 }
1360 JVM_END
1361
1362 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1363 assert (cls != nullptr, "illegal class");
1364 JvmtiVMObjectAllocEventCollector oam;
1365 ResourceMark rm(THREAD);
1366 oop mirror = JNIHandles::resolve_non_null(cls);
1367 // Return null for arrays and primitives
1368 if (!java_lang_Class::is_primitive(mirror)) {
1369 Klass* k = java_lang_Class::as_Klass(mirror);
1370 if (k->is_instance_klass()) {
1371 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1372 if (sym == nullptr) return nullptr;
1373 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1374 return (jstring) JNIHandles::make_local(THREAD, str());
1375 }
1376 }
1377 return nullptr;
1378 JVM_END
1379
1380
1381 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1382 assert (cls != nullptr, "illegal class");
1383 oop mirror = JNIHandles::resolve_non_null(cls);
1384 // Return null for arrays and primitives
1385 if (!java_lang_Class::is_primitive(mirror)) {
1386 Klass* k = java_lang_Class::as_Klass(mirror);
1387 if (k->is_instance_klass()) {
1388 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1389 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1390 }
1391 }
1392 return nullptr;
1393 JVM_END
1394
1395
1396 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1397 // some of this code was adapted from from jni_FromReflectedField
1398
1399 oop reflected = JNIHandles::resolve_non_null(field);
1400 oop mirror = java_lang_reflect_Field::clazz(reflected);
1401 int slot = java_lang_reflect_Field::slot(reflected);
1402 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1403
1404 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1405 int offset = ik->field_offset(slot);
1406
1407 if (modifiers & JVM_ACC_STATIC) {
1408 // for static fields we only look in the current class
1409 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1410 assert(false, "cannot find static field");
1411 return false;
1412 }
1413 } else {
1414 // for instance fields we start with the current class and work
1415 // our way up through the superclass chain
1416 if (!ik->find_field_from_offset(offset, false, &fd)) {
1417 assert(false, "cannot find instance field");
1418 return false;
1419 }
1420 }
1421 return true;
1422 }
1423
1424 static Method* jvm_get_method_common(jobject method) {
1425 // some of this code was adapted from from jni_FromReflectedMethod
1426
1427 oop reflected = JNIHandles::resolve_non_null(method);
1428 oop mirror = nullptr;
1429 int slot = 0;
1430
1431 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1432 mirror = java_lang_reflect_Constructor::clazz(reflected);
1433 slot = java_lang_reflect_Constructor::slot(reflected);
1434 } else {
1435 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1436 "wrong type");
1437 mirror = java_lang_reflect_Method::clazz(reflected);
1438 slot = java_lang_reflect_Method::slot(reflected);
1439 }
1440 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1441
1442 Method* m = ik->method_with_idnum(slot);
1443 assert(m != nullptr, "cannot find method");
1444 return m; // caller has to deal with null in product mode
1445 }
1446
1447 /* Type use annotations support (JDK 1.8) */
1448
1449 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1450 assert (cls != nullptr, "illegal class");
1451 ResourceMark rm(THREAD);
1452 // Return null for arrays and primitives
1453 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1455 if (k->is_instance_klass()) {
1456 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1457 if (type_annotations != nullptr) {
1458 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1459 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1460 }
1461 }
1462 }
1463 return nullptr;
1464 JVM_END
1465
1466 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1467 assert (method != nullptr, "illegal method");
1468 // method is a handle to a java.lang.reflect.Method object
1469 Method* m = jvm_get_method_common(method);
1470 if (m == nullptr) {
1471 return nullptr;
1472 }
1473
1474 AnnotationArray* type_annotations = m->type_annotations();
1475 if (type_annotations != nullptr) {
1476 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1477 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1478 }
1479
1480 return nullptr;
1481 JVM_END
1482
1483 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1484 assert (field != nullptr, "illegal field");
1485 fieldDescriptor fd;
1486 bool gotFd = jvm_get_field_common(field, fd);
1487 if (!gotFd) {
1488 return nullptr;
1489 }
1490
1491 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1492 JVM_END
1493
1494 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1495 if (!cp->is_within_bounds(index)) {
1496 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1497 }
1498 }
1499
1500 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1501 {
1502 // method is a handle to a java.lang.reflect.Method object
1503 Method* method_ptr = jvm_get_method_common(method);
1504 methodHandle mh (THREAD, method_ptr);
1505 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1506 const int num_params = mh->method_parameters_length();
1507
1508 if (num_params < 0) {
1509 // A -1 return value from method_parameters_length means there is no
1510 // parameter data. Return null to indicate this to the reflection
1511 // API.
1512 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1513 return (jobjectArray)nullptr;
1514 } else {
1515 // Otherwise, we return something up to reflection, even if it is
1516 // a zero-length array. Why? Because in some cases this can
1517 // trigger a MalformedParametersException.
1518
1519 // make sure all the symbols are properly formatted
1520 for (int i = 0; i < num_params; i++) {
1521 MethodParametersElement* params = mh->method_parameters_start();
1522 int index = params[i].name_cp_index;
1523 constantPoolHandle cp(THREAD, mh->constants());
1524 bounds_check(cp, index, CHECK_NULL);
1525
1526 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1527 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1528 "Wrong type at constant pool index");
1529 }
1530
1531 }
1532
1533 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1534 objArrayHandle result (THREAD, result_oop);
1535
1536 for (int i = 0; i < num_params; i++) {
1537 MethodParametersElement* params = mh->method_parameters_start();
1538 // For a 0 index, give a null symbol
1539 Symbol* sym = 0 != params[i].name_cp_index ?
1540 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1541 int flags = params[i].flags;
1542 oop param = Reflection::new_parameter(reflected_method, i, sym,
1543 flags, CHECK_NULL);
1544 result->obj_at_put(i, param);
1545 }
1546 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1547 }
1548 }
1549 JVM_END
1550
1551 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1552
1553 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1554 {
1555 JvmtiVMObjectAllocEventCollector oam;
1556
1557 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1558 // Exclude primitive types and array types
1559 if (java_lang_Class::is_primitive(ofMirror) ||
1560 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1561 // Return empty array
1562 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1563 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1564 }
1565
1566 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1567 constantPoolHandle cp(THREAD, k->constants());
1568
1569 // Ensure class is linked
1570 k->link_class(CHECK_NULL);
1571
1572 // Allocate result
1573 int num_fields;
1574
1575 if (publicOnly) {
1576 num_fields = 0;
1577 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1578 if (fs.access_flags().is_public()) ++num_fields;
1579 }
1580 } else {
1581 num_fields = k->java_fields_count();
1582 }
1583
1584 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1585 objArrayHandle result (THREAD, r);
1586
1587 int out_idx = 0;
1588 fieldDescriptor fd;
1589 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1590 if (!publicOnly || fs.access_flags().is_public()) {
1591 fd.reinitialize(k, fs.to_FieldInfo());
1592 oop field = Reflection::new_field(&fd, CHECK_NULL);
1593 result->obj_at_put(out_idx, field);
1594 ++out_idx;
1595 }
1596 }
1597 assert(out_idx == num_fields, "just checking");
1598 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1599 }
1600 JVM_END
1601
1602 // A class is a record if and only if it is final and a direct subclass of
1603 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1604 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1605 {
1606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1607 if (k != nullptr && k->is_instance_klass()) {
1608 InstanceKlass* ik = InstanceKlass::cast(k);
1609 return ik->is_record();
1610 } else {
1611 return false;
1612 }
1613 }
1614 JVM_END
1615
1616 // Returns an array containing the components of the Record attribute,
1617 // or null if the attribute is not present.
1618 //
1619 // Note that this function returns the components of the Record attribute
1620 // even if the class is not a record.
1621 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1622 {
1623 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1624
1625 Array<RecordComponent*>* components = ik->record_components();
1626 if (components != nullptr) {
1627 JvmtiVMObjectAllocEventCollector oam;
1628 constantPoolHandle cp(THREAD, ik->constants());
1629 int length = components->length();
1630 assert(length >= 0, "unexpected record_components length");
1631 objArrayOop record_components =
1632 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1633 objArrayHandle components_h (THREAD, record_components);
1634
1635 for (int x = 0; x < length; x++) {
1636 RecordComponent* component = components->at(x);
1637 assert(component != nullptr, "unexpected null record component");
1638 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1639 components_h->obj_at_put(x, component_oop);
1640 }
1641 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1642 }
1643
1644 return nullptr;
1645 }
1646 JVM_END
1647
1648 static jobjectArray get_class_declared_methods_helper(
1649 JNIEnv *env,
1650 jclass ofClass, jboolean publicOnly,
1651 bool want_constructor,
1652 Klass* klass, TRAPS) {
1653
1654 JvmtiVMObjectAllocEventCollector oam;
1655
1656 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1657 // Exclude primitive types and array types
1658 if (java_lang_Class::is_primitive(ofMirror)
1659 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1660 // Return empty array
1661 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1662 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1663 }
1664
1665 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1666
1667 // Ensure class is linked
1668 k->link_class(CHECK_NULL);
1669
1670 Array<Method*>* methods = k->methods();
1671 int methods_length = methods->length();
1672
1673 // Save original method_idnum in case of redefinition, which can change
1674 // the idnum of obsolete methods. The new method will have the same idnum
1675 // but if we refresh the methods array, the counts will be wrong.
1676 ResourceMark rm(THREAD);
1677 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1678 int num_methods = 0;
1679
1680 // Select methods matching the criteria.
1681 for (int i = 0; i < methods_length; i++) {
1682 Method* method = methods->at(i);
1683 if (want_constructor && !method->is_object_initializer()) {
1684 continue;
1685 }
1686 if (!want_constructor &&
1687 (method->is_object_initializer() || method->is_static_initializer() ||
1688 method->is_overpass())) {
1689 continue;
1690 }
1691 if (publicOnly && !method->is_public()) {
1692 continue;
1693 }
1694 idnums->push(method->method_idnum());
1695 ++num_methods;
1696 }
1697
1698 // Allocate result
1699 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1700 objArrayHandle result (THREAD, r);
1701
1702 // Now just put the methods that we selected above, but go by their idnum
1703 // in case of redefinition. The methods can be redefined at any safepoint,
1704 // so above when allocating the oop array and below when creating reflect
1705 // objects.
1706 for (int i = 0; i < num_methods; i++) {
1707 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1708 if (method.is_null()) {
1709 // Method may have been deleted and seems this API can handle null
1710 // Otherwise should probably put a method that throws NSME
1711 result->obj_at_put(i, nullptr);
1712 } else {
1713 oop m;
1714 if (want_constructor) {
1715 m = Reflection::new_constructor(method, CHECK_NULL);
1716 } else {
1717 m = Reflection::new_method(method, false, CHECK_NULL);
1718 }
1719 result->obj_at_put(i, m);
1720 }
1721 }
1722
1723 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1724 }
1725
1726 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1727 {
1728 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1729 /*want_constructor*/ false,
1730 vmClasses::reflect_Method_klass(), THREAD);
1731 }
1732 JVM_END
1733
1734 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1735 {
1736 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1737 /*want_constructor*/ true,
1738 vmClasses::reflect_Constructor_klass(), THREAD);
1739 }
1740 JVM_END
1741
1742 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1743 {
1744 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1745 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1746 return c->has_nestmate_access_to(m, THREAD);
1747 }
1748 JVM_END
1749
1750 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1751 {
1752 // current is not a primitive or array class
1753 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1754 InstanceKlass* host = c->nest_host(THREAD);
1755 return (jclass) (host == nullptr ? nullptr :
1756 JNIHandles::make_local(THREAD, host->java_mirror()));
1757 }
1758 JVM_END
1759
1760 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1761 {
1762 // current is not a primitive or array class
1763 ResourceMark rm(THREAD);
1764 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1765 InstanceKlass* host = c->nest_host(THREAD);
1766
1767 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1768 c->external_name(), host->external_name());
1769 {
1770 JvmtiVMObjectAllocEventCollector oam;
1771 Array<u2>* members = host->nest_members();
1772 int length = members == nullptr ? 0 : members->length();
1773
1774 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1775
1776 // nest host is first in the array so make it one bigger
1777 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1778 length + 1, CHECK_NULL);
1779 objArrayHandle result(THREAD, r);
1780 result->obj_at_put(0, host->java_mirror());
1781 if (length != 0) {
1782 int count = 0;
1783 for (int i = 0; i < length; i++) {
1784 int cp_index = members->at(i);
1785 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1786 if (HAS_PENDING_EXCEPTION) {
1787 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1788 return nullptr; // propagate VMEs
1789 }
1790 if (log_is_enabled(Trace, class, nestmates)) {
1791 stringStream ss;
1792 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1793 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1794 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1795 log_trace(class, nestmates)("%s", ss.as_string());
1796 }
1797 CLEAR_PENDING_EXCEPTION;
1798 continue;
1799 }
1800 if (k->is_instance_klass()) {
1801 InstanceKlass* ik = InstanceKlass::cast(k);
1802 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1803 if (nest_host_k == host) {
1804 result->obj_at_put(count+1, k->java_mirror());
1805 count++;
1806 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1807 } else {
1808 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1809 ik->external_name(), nest_host_k->external_name());
1810 }
1811 } else {
1812 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1813 k->external_name());
1814 }
1815 }
1816 if (count < length) {
1817 // we had invalid entries so we need to compact the array
1818 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1819 length + 1, count + 1);
1820
1821 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1822 count + 1, CHECK_NULL);
1823 objArrayHandle result2(THREAD, r2);
1824 for (int i = 0; i < count + 1; i++) {
1825 result2->obj_at_put(i, result->obj_at(i));
1826 }
1827 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1828 }
1829 }
1830 else {
1831 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1832 }
1833 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1834 }
1835 }
1836 JVM_END
1837
1838 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1839 {
1840 oop mirror = JNIHandles::resolve_non_null(current);
1841 assert(!java_lang_Class::is_primitive(mirror), "should not be");
1842 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1843
1844 ResourceMark rm(THREAD);
1845 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
1846 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
1847 if (ik->is_sealed()) {
1848 JvmtiVMObjectAllocEventCollector oam;
1849 Array<u2>* subclasses = ik->permitted_subclasses();
1850 int length = subclasses->length();
1851
1852 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
1853
1854 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1855 length, CHECK_NULL);
1856 objArrayHandle result(THREAD, r);
1857 int count = 0;
1858 for (int i = 0; i < length; i++) {
1859 int cp_index = subclasses->at(i);
1860 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
1861 if (HAS_PENDING_EXCEPTION) {
1862 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1863 return nullptr; // propagate VMEs
1864 }
1865 if (log_is_enabled(Trace, class, sealed)) {
1866 stringStream ss;
1867 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
1868 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
1869 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1870 log_trace(class, sealed)("%s", ss.as_string());
1871 }
1872
1873 CLEAR_PENDING_EXCEPTION;
1874 continue;
1875 }
1876 if (k->is_instance_klass()) {
1877 result->obj_at_put(count++, k->java_mirror());
1878 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
1879 }
1880 }
1881 if (count < length) {
1882 // we had invalid entries so we need to compact the array
1883 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1884 count, CHECK_NULL);
1885 objArrayHandle result2(THREAD, r2);
1886 for (int i = 0; i < count; i++) {
1887 result2->obj_at_put(i, result->obj_at(i));
1888 }
1889 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1890 }
1891 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1892 } else {
1893 return nullptr;
1894 }
1895 }
1896 JVM_END
1897
1898 // Constant pool access //////////////////////////////////////////////////////////
1899
1900 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1901 {
1902 JvmtiVMObjectAllocEventCollector oam;
1903 oop mirror = JNIHandles::resolve_non_null(cls);
1904 // Return null for primitives and arrays
1905 if (!java_lang_Class::is_primitive(mirror)) {
1906 Klass* k = java_lang_Class::as_Klass(mirror);
1907 if (k->is_instance_klass()) {
1908 InstanceKlass* k_h = InstanceKlass::cast(k);
1909 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1910 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1911 return JNIHandles::make_local(THREAD, jcp());
1912 }
1913 }
1914 return nullptr;
1915 }
1916 JVM_END
1917
1918
1919 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
1920 {
1921 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1922 return cp->length();
1923 }
1924 JVM_END
1925
1926
1927 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
1928 {
1929 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1930 bounds_check(cp, index, CHECK_NULL);
1931 constantTag tag = cp->tag_at(index);
1932 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1933 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1934 }
1935 Klass* k = cp->klass_at(index, CHECK_NULL);
1936 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1937 }
1938 JVM_END
1939
1940 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1941 {
1942 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1943 bounds_check(cp, index, CHECK_NULL);
1944 constantTag tag = cp->tag_at(index);
1945 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1946 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1947 }
1948 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1949 if (k == nullptr) return nullptr;
1950 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1951 }
1952 JVM_END
1953
1954 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1955 constantTag tag = cp->tag_at(index);
1956 if (!tag.is_method() && !tag.is_interface_method()) {
1957 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1958 }
1959 int klass_ref = cp->uncached_klass_ref_index_at(index);
1960 Klass* k_o;
1961 if (force_resolution) {
1962 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1963 } else {
1964 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1965 if (k_o == nullptr) return nullptr;
1966 }
1967 InstanceKlass* k = InstanceKlass::cast(k_o);
1968 Symbol* name = cp->uncached_name_ref_at(index);
1969 Symbol* sig = cp->uncached_signature_ref_at(index);
1970 methodHandle m (THREAD, k->find_method(name, sig));
1971 if (m.is_null()) {
1972 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1973 }
1974 oop method;
1975 if (m->is_object_initializer()) {
1976 method = Reflection::new_constructor(m, CHECK_NULL);
1977 } else {
1978 // new_method accepts <clinit> as Method here
1979 method = Reflection::new_method(m, true, CHECK_NULL);
1980 }
1981 return JNIHandles::make_local(THREAD, method);
1982 }
1983
1984 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
1985 {
1986 JvmtiVMObjectAllocEventCollector oam;
1987 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1988 bounds_check(cp, index, CHECK_NULL);
1989 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1990 return res;
1991 }
1992 JVM_END
1993
1994 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
1995 {
1996 JvmtiVMObjectAllocEventCollector oam;
1997 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1998 bounds_check(cp, index, CHECK_NULL);
1999 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2000 return res;
2001 }
2002 JVM_END
2003
2004 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2005 constantTag tag = cp->tag_at(index);
2006 if (!tag.is_field()) {
2007 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2008 }
2009 int klass_ref = cp->uncached_klass_ref_index_at(index);
2010 Klass* k_o;
2011 if (force_resolution) {
2012 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2013 } else {
2014 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2015 if (k_o == nullptr) return nullptr;
2016 }
2017 InstanceKlass* k = InstanceKlass::cast(k_o);
2018 Symbol* name = cp->uncached_name_ref_at(index);
2019 Symbol* sig = cp->uncached_signature_ref_at(index);
2020 fieldDescriptor fd;
2021 Klass* target_klass = k->find_field(name, sig, &fd);
2022 if (target_klass == nullptr) {
2023 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2024 }
2025 oop field = Reflection::new_field(&fd, CHECK_NULL);
2026 return JNIHandles::make_local(THREAD, field);
2027 }
2028
2029 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2030 {
2031 JvmtiVMObjectAllocEventCollector oam;
2032 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2033 bounds_check(cp, index, CHECK_NULL);
2034 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2035 return res;
2036 }
2037 JVM_END
2038
2039 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2040 {
2041 JvmtiVMObjectAllocEventCollector oam;
2042 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2043 bounds_check(cp, index, CHECK_NULL);
2044 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2045 return res;
2046 }
2047 JVM_END
2048
2049 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2050 {
2051 JvmtiVMObjectAllocEventCollector oam;
2052 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2053 bounds_check(cp, index, CHECK_NULL);
2054 constantTag tag = cp->tag_at(index);
2055 if (!tag.is_field_or_method()) {
2056 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2057 }
2058 int klass_ref = cp->uncached_klass_ref_index_at(index);
2059 Symbol* klass_name = cp->klass_name_at(klass_ref);
2060 Symbol* member_name = cp->uncached_name_ref_at(index);
2061 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2062 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2063 objArrayHandle dest(THREAD, dest_o);
2064 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2065 dest->obj_at_put(0, str());
2066 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2067 dest->obj_at_put(1, str());
2068 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2069 dest->obj_at_put(2, str());
2070 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2071 }
2072 JVM_END
2073
2074 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2075 {
2076 JvmtiVMObjectAllocEventCollector oam;
2077 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2078 bounds_check(cp, index, CHECK_0);
2079 constantTag tag = cp->tag_at(index);
2080 if (!tag.is_field_or_method()) {
2081 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2082 }
2083 return (jint) cp->uncached_klass_ref_index_at(index);
2084 }
2085 JVM_END
2086
2087 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2088 {
2089 JvmtiVMObjectAllocEventCollector oam;
2090 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2091 bounds_check(cp, index, CHECK_0);
2092 constantTag tag = cp->tag_at(index);
2093 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2094 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2095 }
2096 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2097 }
2098 JVM_END
2099
2100 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2101 {
2102 JvmtiVMObjectAllocEventCollector oam;
2103 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2104 bounds_check(cp, index, CHECK_NULL);
2105 constantTag tag = cp->tag_at(index);
2106 if (!tag.is_name_and_type()) {
2107 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2108 }
2109 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2110 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2111 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2112 objArrayHandle dest(THREAD, dest_o);
2113 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2114 dest->obj_at_put(0, str());
2115 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2116 dest->obj_at_put(1, str());
2117 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2118 }
2119 JVM_END
2120
2121 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2122 {
2123 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2124 bounds_check(cp, index, CHECK_0);
2125 constantTag tag = cp->tag_at(index);
2126 if (!tag.is_int()) {
2127 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2128 }
2129 return cp->int_at(index);
2130 }
2131 JVM_END
2132
2133 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2134 {
2135 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2136 bounds_check(cp, index, CHECK_(0L));
2137 constantTag tag = cp->tag_at(index);
2138 if (!tag.is_long()) {
2139 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2140 }
2141 return cp->long_at(index);
2142 }
2143 JVM_END
2144
2145 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2146 {
2147 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2148 bounds_check(cp, index, CHECK_(0.0f));
2149 constantTag tag = cp->tag_at(index);
2150 if (!tag.is_float()) {
2151 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2152 }
2153 return cp->float_at(index);
2154 }
2155 JVM_END
2156
2157 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2158 {
2159 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2160 bounds_check(cp, index, CHECK_(0.0));
2161 constantTag tag = cp->tag_at(index);
2162 if (!tag.is_double()) {
2163 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2164 }
2165 return cp->double_at(index);
2166 }
2167 JVM_END
2168
2169 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2170 {
2171 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2172 bounds_check(cp, index, CHECK_NULL);
2173 constantTag tag = cp->tag_at(index);
2174 if (!tag.is_string()) {
2175 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2176 }
2177 oop str = cp->string_at(index, CHECK_NULL);
2178 return (jstring) JNIHandles::make_local(THREAD, str);
2179 }
2180 JVM_END
2181
2182 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2183 {
2184 JvmtiVMObjectAllocEventCollector oam;
2185 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2186 bounds_check(cp, index, CHECK_NULL);
2187 constantTag tag = cp->tag_at(index);
2188 if (!tag.is_symbol()) {
2189 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2190 }
2191 Symbol* sym = cp->symbol_at(index);
2192 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2193 return (jstring) JNIHandles::make_local(THREAD, str());
2194 }
2195 JVM_END
2196
2197 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2198 {
2199 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2200 bounds_check(cp, index, CHECK_0);
2201 constantTag tag = cp->tag_at(index);
2202 jbyte result = tag.value();
2203 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2204 // they are changed to the corresponding tags from the JVM spec, so that java code in
2205 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2206 if (tag.is_klass_or_reference()) {
2207 result = JVM_CONSTANT_Class;
2208 } else if (tag.is_string_index()) {
2209 result = JVM_CONSTANT_String;
2210 } else if (tag.is_method_type_in_error()) {
2211 result = JVM_CONSTANT_MethodType;
2212 } else if (tag.is_method_handle_in_error()) {
2213 result = JVM_CONSTANT_MethodHandle;
2214 } else if (tag.is_dynamic_constant_in_error()) {
2215 result = JVM_CONSTANT_Dynamic;
2216 }
2217 return result;
2218 }
2219 JVM_END
2220
2221 // Assertion support. //////////////////////////////////////////////////////////
2222
2223 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2224 assert(cls != nullptr, "bad class");
2225
2226 oop r = JNIHandles::resolve(cls);
2227 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2228 if (java_lang_Class::is_primitive(r)) return false;
2229
2230 Klass* k = java_lang_Class::as_Klass(r);
2231 assert(k->is_instance_klass(), "must be an instance klass");
2232 if (!k->is_instance_klass()) return false;
2233
2234 ResourceMark rm(THREAD);
2235 const char* name = k->name()->as_C_string();
2236 bool system_class = k->class_loader() == nullptr;
2237 return JavaAssertions::enabled(name, system_class);
2238
2239 JVM_END
2240
2241
2242 // Return a new AssertionStatusDirectives object with the fields filled in with
2243 // command-line assertion arguments (i.e., -ea, -da).
2244 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2245 JvmtiVMObjectAllocEventCollector oam;
2246 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2247 return JNIHandles::make_local(THREAD, asd);
2248 JVM_END
2249
2250 // Verification ////////////////////////////////////////////////////////////////////////////////
2251
2252 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2253
2254 // RedefineClasses support: bug 6214132 caused verification to fail.
2255 // All functions from this section, unless noted otherwise, should call the functions
2256 // get_klass_considering_redefinition(), or
2257 // get_instance_klass_considering_redefinition()
2258 // These functions return JvmtiThreadState::_scratch_class if the verifier
2259 // was invoked in the middle of the redefinition of cls.
2260 // See jvmtiThreadState.hpp for details.
2261
2262 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2263 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2264 if (k->is_instance_klass()) {
2265 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2266 } else {
2267 return k;
2268 }
2269 }
2270
2271 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2272 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2273 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2274 }
2275
2276 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2277 oop mirror = JNIHandles::resolve_non_null(cls);
2278 if (java_lang_Class::is_primitive(mirror)) {
2279 return JNI_FALSE;
2280 }
2281 Klass* k = java_lang_Class::as_Klass(mirror);
2282 // This isn't necessary since answer is the same because redefinition
2283 // has already checked this matches for the scratch class.
2284 // k = get_klass_considering_redefinition(cls, thread)
2285 jboolean result = k->is_interface();
2286 assert(!result || k->is_instance_klass(),
2287 "all interfaces are instance types");
2288 return result;
2289 JVM_END
2290
2291 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2292 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2293 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2294 return k->name()->as_utf8();
2295 JVM_END
2296
2297
2298 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2299 Klass* k = get_klass_considering_redefinition(cls, thread);
2300 // types will have length zero if this is not an InstanceKlass
2301 // (length is determined by call to JVM_GetClassCPEntriesCount)
2302 if (k->is_instance_klass()) {
2303 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2304 for (int index = cp->length() - 1; index >= 0; index--) {
2305 constantTag tag = cp->tag_at(index);
2306 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2307 }
2308 }
2309 JVM_END
2310
2311
2312 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2313 Klass* k = get_klass_considering_redefinition(cls, thread);
2314 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2315 JVM_END
2316
2317
2318 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2319 Klass* k = get_klass_considering_redefinition(cls, thread);
2320 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2321 JVM_END
2322
2323
2324 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2325 Klass* k = get_klass_considering_redefinition(cls, thread);
2326 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2327 JVM_END
2328
2329
2330 // The following methods, used for the verifier, are never called with
2331 // array klasses, so a direct cast to InstanceKlass is safe.
2332 // Typically, these methods are called in a loop with bounds determined
2333 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2334 // zero for arrays.
2335 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2336 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2337 Method* method = ik->methods()->at(method_index);
2338 int length = method->checked_exceptions_length();
2339 if (length > 0) {
2340 CheckedExceptionElement* table= method->checked_exceptions_start();
2341 for (int i = 0; i < length; i++) {
2342 exceptions[i] = table[i].class_cp_index;
2343 }
2344 }
2345 JVM_END
2346
2347
2348 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2349 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2350 Method* method = ik->methods()->at(method_index);
2351 return method->checked_exceptions_length();
2352 JVM_END
2353
2354
2355 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2356 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2357 Method* method = ik->methods()->at(method_index);
2358 memcpy(code, method->code_base(), method->code_size());
2359 JVM_END
2360
2361
2362 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2363 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2364 Method* method = ik->methods()->at(method_index);
2365 return method->code_size();
2366 JVM_END
2367
2368
2369 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2370 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2371 Method* method = ik->methods()->at(method_index);
2372 ExceptionTable extable(method);
2373 entry->start_pc = extable.start_pc(entry_index);
2374 entry->end_pc = extable.end_pc(entry_index);
2375 entry->handler_pc = extable.handler_pc(entry_index);
2376 entry->catchType = extable.catch_type_index(entry_index);
2377 JVM_END
2378
2379
2380 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2381 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2382 Method* method = ik->methods()->at(method_index);
2383 return method->exception_table_length();
2384 JVM_END
2385
2386
2387 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2388 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2389 Method* method = ik->methods()->at(method_index);
2390 return method->access_flags().as_method_flags();
2391 JVM_END
2392
2393
2394 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2395 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2396 return ik->field_access_flags(field_index);
2397 JVM_END
2398
2399
2400 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2401 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2402 Method* method = ik->methods()->at(method_index);
2403 return method->max_locals();
2404 JVM_END
2405
2406
2407 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2408 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2409 Method* method = ik->methods()->at(method_index);
2410 return method->size_of_parameters();
2411 JVM_END
2412
2413
2414 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2415 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2416 Method* method = ik->methods()->at(method_index);
2417 return method->verifier_max_stack();
2418 JVM_END
2419
2420
2421 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2422 ResourceMark rm(THREAD);
2423 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2424 Method* method = ik->methods()->at(method_index);
2425 return method->name() == vmSymbols::object_initializer_name();
2426 JVM_END
2427
2428
2429 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2430 ResourceMark rm(THREAD);
2431 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2432 Method* method = ik->methods()->at(method_index);
2433 return method->is_overpass();
2434 JVM_END
2435
2436 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2437 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2438 Method* method = ik->methods()->at(method_index);
2439 return method->name()->as_utf8();
2440 JVM_END
2441
2442
2443 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2444 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2445 Method* method = ik->methods()->at(method_index);
2446 return method->signature()->as_utf8();
2447 JVM_END
2448
2449 /**
2450 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2451 * read entries in the constant pool. Since the old verifier always
2452 * works on a copy of the code, it will not see any rewriting that
2453 * may possibly occur in the middle of verification. So it is important
2454 * that nothing it calls tries to use the cpCache instead of the raw
2455 * constant pool, so we must use cp->uncached_x methods when appropriate.
2456 */
2457 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2458 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2459 ConstantPool* cp = ik->constants();
2460 switch (cp->tag_at(cp_index).value()) {
2461 case JVM_CONSTANT_Fieldref:
2462 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2463 default:
2464 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2465 }
2466 ShouldNotReachHere();
2467 return nullptr;
2468 JVM_END
2469
2470
2471 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2472 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2473 ConstantPool* cp = ik->constants();
2474 switch (cp->tag_at(cp_index).value()) {
2475 case JVM_CONSTANT_InterfaceMethodref:
2476 case JVM_CONSTANT_Methodref:
2477 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2478 default:
2479 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2480 }
2481 ShouldNotReachHere();
2482 return nullptr;
2483 JVM_END
2484
2485
2486 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2487 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2488 ConstantPool* cp = ik->constants();
2489 switch (cp->tag_at(cp_index).value()) {
2490 case JVM_CONSTANT_InterfaceMethodref:
2491 case JVM_CONSTANT_Methodref:
2492 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2493 default:
2494 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2495 }
2496 ShouldNotReachHere();
2497 return nullptr;
2498 JVM_END
2499
2500
2501 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2502 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2503 ConstantPool* cp = ik->constants();
2504 switch (cp->tag_at(cp_index).value()) {
2505 case JVM_CONSTANT_Fieldref:
2506 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2507 default:
2508 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2509 }
2510 ShouldNotReachHere();
2511 return nullptr;
2512 JVM_END
2513
2514
2515 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2516 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2517 ConstantPool* cp = ik->constants();
2518 Symbol* classname = cp->klass_name_at(cp_index);
2519 return classname->as_utf8();
2520 JVM_END
2521
2522
2523 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2524 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2525 ConstantPool* cp = ik->constants();
2526 switch (cp->tag_at(cp_index).value()) {
2527 case JVM_CONSTANT_Fieldref: {
2528 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2529 Symbol* classname = cp->klass_name_at(class_index);
2530 return classname->as_utf8();
2531 }
2532 default:
2533 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2534 }
2535 ShouldNotReachHere();
2536 return nullptr;
2537 JVM_END
2538
2539
2540 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2541 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2542 ConstantPool* cp = ik->constants();
2543 switch (cp->tag_at(cp_index).value()) {
2544 case JVM_CONSTANT_Methodref:
2545 case JVM_CONSTANT_InterfaceMethodref: {
2546 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2547 Symbol* classname = cp->klass_name_at(class_index);
2548 return classname->as_utf8();
2549 }
2550 default:
2551 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2552 }
2553 ShouldNotReachHere();
2554 return nullptr;
2555 JVM_END
2556
2557
2558 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2559 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2560 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2561 ConstantPool* cp = ik->constants();
2562 ConstantPool* cp_called = ik_called->constants();
2563 switch (cp->tag_at(cp_index).value()) {
2564 case JVM_CONSTANT_Fieldref: {
2565 Symbol* name = cp->uncached_name_ref_at(cp_index);
2566 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2567 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2568 if (fs.name() == name && fs.signature() == signature) {
2569 return fs.access_flags().as_field_flags();
2570 }
2571 }
2572 return -1;
2573 }
2574 default:
2575 fatal("JVM_GetCPFieldModifiers: illegal constant");
2576 }
2577 ShouldNotReachHere();
2578 return 0;
2579 JVM_END
2580
2581
2582 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2583 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2584 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2585 ConstantPool* cp = ik->constants();
2586 switch (cp->tag_at(cp_index).value()) {
2587 case JVM_CONSTANT_Methodref:
2588 case JVM_CONSTANT_InterfaceMethodref: {
2589 Symbol* name = cp->uncached_name_ref_at(cp_index);
2590 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2591 Array<Method*>* methods = ik_called->methods();
2592 int methods_count = methods->length();
2593 for (int i = 0; i < methods_count; i++) {
2594 Method* method = methods->at(i);
2595 if (method->name() == name && method->signature() == signature) {
2596 return method->access_flags().as_method_flags();
2597 }
2598 }
2599 return -1;
2600 }
2601 default:
2602 fatal("JVM_GetCPMethodModifiers: illegal constant");
2603 }
2604 ShouldNotReachHere();
2605 return 0;
2606 JVM_END
2607
2608
2609 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2610
2611 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2612 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2613 JVM_END
2614
2615
2616 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2617 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2618 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2619 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2620 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2621 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2622 JVM_END
2623
2624 // Printing support //////////////////////////////////////////////////
2625 extern "C" {
2626
2627 ATTRIBUTE_PRINTF(3, 0)
2628 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2629 // Reject count values that are negative signed values converted to
2630 // unsigned; see bug 4399518, 4417214
2631 if ((intptr_t)count <= 0) return -1;
2632
2633 int result = os::vsnprintf(str, count, fmt, args);
2634 if (result > 0 && (size_t)result >= count) {
2635 result = -1;
2636 }
2637
2638 return result;
2639 }
2640
2641 ATTRIBUTE_PRINTF(3, 4)
2642 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2643 va_list args;
2644 int len;
2645 va_start(args, fmt);
2646 len = jio_vsnprintf(str, count, fmt, args);
2647 va_end(args);
2648 return len;
2649 }
2650
2651 ATTRIBUTE_PRINTF(2, 3)
2652 int jio_fprintf(FILE* f, const char *fmt, ...) {
2653 int len;
2654 va_list args;
2655 va_start(args, fmt);
2656 len = jio_vfprintf(f, fmt, args);
2657 va_end(args);
2658 return len;
2659 }
2660
2661 ATTRIBUTE_PRINTF(2, 0)
2662 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2663 if (Arguments::vfprintf_hook() != nullptr) {
2664 return Arguments::vfprintf_hook()(f, fmt, args);
2665 } else {
2666 return vfprintf(f, fmt, args);
2667 }
2668 }
2669
2670 ATTRIBUTE_PRINTF(1, 2)
2671 JNIEXPORT int jio_printf(const char *fmt, ...) {
2672 int len;
2673 va_list args;
2674 va_start(args, fmt);
2675 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2676 va_end(args);
2677 return len;
2678 }
2679
2680 // HotSpot specific jio method
2681 void jio_print(const char* s, size_t len) {
2682 // Try to make this function as atomic as possible.
2683 if (Arguments::vfprintf_hook() != nullptr) {
2684 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2685 } else {
2686 // Make an unused local variable to avoid warning from gcc compiler.
2687 bool dummy = os::write(defaultStream::output_fd(), s, len);
2688 }
2689 }
2690
2691 } // Extern C
2692
2693 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2694
2695 // In most of the JVM thread support functions we need to access the
2696 // thread through a ThreadsListHandle to prevent it from exiting and
2697 // being reclaimed while we try to operate on it. The exceptions to this
2698 // rule are when operating on the current thread, or if the monitor of
2699 // the target java.lang.Thread is locked at the Java level - in both
2700 // cases the target cannot exit.
2701
2702 static void thread_entry(JavaThread* thread, TRAPS) {
2703 HandleMark hm(THREAD);
2704 Handle obj(THREAD, thread->threadObj());
2705 JavaValue result(T_VOID);
2706 JavaCalls::call_virtual(&result,
2707 obj,
2708 vmClasses::Thread_klass(),
2709 vmSymbols::run_method_name(),
2710 vmSymbols::void_method_signature(),
2711 THREAD);
2712 }
2713
2714
2715 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2716 #if INCLUDE_CDS
2717 if (CDSConfig::allow_only_single_java_thread()) {
2718 // During java -Xshare:dump, if we allow multiple Java threads to
2719 // execute in parallel, symbols and classes may be loaded in
2720 // random orders which will make the resulting CDS archive
2721 // non-deterministic.
2722 //
2723 // Lucikly, during java -Xshare:dump, it's important to run only
2724 // the code in the main Java thread (which is NOT started here) that
2725 // creates the module graph, etc. It's safe to not start the other
2726 // threads which are launched by class static initializers
2727 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2728 if (log_is_enabled(Info, aot)) {
2729 ResourceMark rm;
2730 oop t = JNIHandles::resolve_non_null(jthread);
2731 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2732 }
2733 return;
2734 }
2735 #endif
2736 JavaThread *native_thread = nullptr;
2737
2738 // We cannot hold the Threads_lock when we throw an exception,
2739 // due to rank ordering issues. Example: we might need to grab the
2740 // Heap_lock while we construct the exception.
2741 bool throw_illegal_thread_state = false;
2742
2743 // We must release the Threads_lock before we can post a jvmti event
2744 // in Thread::start.
2745 {
2746 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2747 // Ensure that the C++ Thread and OSThread structures aren't freed before
2748 // we operate.
2749 MutexLocker ml(Threads_lock);
2750
2751 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2752 // re-starting an already started thread, so we should usually find
2753 // that the JavaThread is null. However for a JNI attached thread
2754 // there is a small window between the Thread object being created
2755 // (with its JavaThread set) and the update to its threadStatus, so we
2756 // have to check for this
2757 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2758 throw_illegal_thread_state = true;
2759 } else {
2760 jlong size =
2761 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2762 // Allocate the C++ Thread structure and create the native thread. The
2763 // stack size retrieved from java is 64-bit signed, but the constructor takes
2764 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2765 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2766 // - Avoid passing negative values which would result in really large stacks.
2767 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2768 size_t sz = size > 0 ? (size_t) size : 0;
2769 native_thread = new JavaThread(&thread_entry, sz);
2770
2771 // At this point it may be possible that no osthread was created for the
2772 // JavaThread due to lack of memory. Check for this situation and throw
2773 // an exception if necessary. Eventually we may want to change this so
2774 // that we only grab the lock if the thread was created successfully -
2775 // then we can also do this check and throw the exception in the
2776 // JavaThread constructor.
2777 if (native_thread->osthread() != nullptr) {
2778 // Note: the current thread is not being used within "prepare".
2779 native_thread->prepare(jthread);
2780 }
2781 }
2782 }
2783
2784 if (throw_illegal_thread_state) {
2785 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2786 }
2787
2788 assert(native_thread != nullptr, "Starting null thread?");
2789
2790 if (native_thread->osthread() == nullptr) {
2791 ResourceMark rm(thread);
2792 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2793 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2794 // No one should hold a reference to the 'native_thread'.
2795 native_thread->smr_delete();
2796 if (JvmtiExport::should_post_resource_exhausted()) {
2797 JvmtiExport::post_resource_exhausted(
2798 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2799 os::native_thread_creation_failed_msg());
2800 }
2801 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2802 os::native_thread_creation_failed_msg());
2803 }
2804
2805 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2806
2807 Thread::start(native_thread);
2808
2809 JVM_END
2810
2811
2812 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2813 ThreadsListHandle tlh(thread);
2814 oop java_thread = nullptr;
2815 JavaThread* receiver = nullptr;
2816 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2817 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2818
2819 if (is_alive) {
2820 // jthread refers to a live JavaThread.
2821 Thread::set_priority(receiver, (ThreadPriority)prio);
2822 }
2823 // Implied else: If the JavaThread hasn't started yet, then the
2824 // priority set in the java.lang.Thread object above will be pushed
2825 // down when it does start.
2826 JVM_END
2827
2828
2829 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2830 HOTSPOT_THREAD_YIELD();
2831 os::naked_yield();
2832 JVM_END
2833
2834 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2835 if (nanos < 0) {
2836 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2837 }
2838
2839 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2840 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2841 }
2842
2843 // Save current thread state and restore it at the end of this block.
2844 // And set new thread state to SLEEPING.
2845 JavaThreadSleepState jtss(thread);
2846
2847 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
2848
2849 if (nanos == 0) {
2850 os::naked_yield();
2851 } else {
2852 ThreadState old_state = thread->osthread()->get_state();
2853 thread->osthread()->set_state(SLEEPING);
2854 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
2855 // An asynchronous exception could have been thrown on
2856 // us while we were sleeping. We do not overwrite those.
2857 if (!HAS_PENDING_EXCEPTION) {
2858 HOTSPOT_THREAD_SLEEP_END(1);
2859 if (!thread->has_async_exception_condition()) {
2860 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2861 // to properly restore the thread state. That's likely wrong.
2862 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2863 }
2864 }
2865 }
2866 thread->osthread()->set_state(old_state);
2867 }
2868 HOTSPOT_THREAD_SLEEP_END(0);
2869 JVM_END
2870
2871 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
2872 oop jthread = thread->threadObj();
2873 assert(jthread != nullptr, "no current carrier thread!");
2874 return JNIHandles::make_local(THREAD, jthread);
2875 JVM_END
2876
2877 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2878 oop theThread = thread->vthread();
2879 assert(theThread != (oop)nullptr, "no current thread!");
2880 return JNIHandles::make_local(THREAD, theThread);
2881 JVM_END
2882
2883 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
2884 jobject theThread))
2885 oop threadObj = JNIHandles::resolve(theThread);
2886 thread->set_vthread(threadObj);
2887
2888 // Set _monitor_owner_id of new current Thread
2889 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
2890
2891 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
2892 JVM_END
2893
2894 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
2895 return ThreadIdentifier::unsafe_offset();
2896 JVM_END
2897
2898 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2899 ThreadsListHandle tlh(thread);
2900 JavaThread* receiver = nullptr;
2901 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
2902 if (is_alive) {
2903 // jthread refers to a live JavaThread.
2904 receiver->interrupt();
2905 }
2906 JVM_END
2907
2908 // Return true iff the current thread has locked the object passed in
2909
2910 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
2911 if (obj == nullptr) {
2912 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
2913 }
2914 Handle h_obj(THREAD, JNIHandles::resolve(obj));
2915 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
2916 JVM_END
2917
2918 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
2919 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
2920 return JNIHandles::make_local(THREAD, trace);
2921 JVM_END
2922
2923 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
2924 #if INCLUDE_JVMTI
2925 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
2926 return JNIHandles::make_local(THREAD, snapshot);
2927 #else
2928 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
2929 #endif
2930 JVM_END
2931
2932 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
2933 // We don't use a ThreadsListHandle here because the current thread
2934 // must be alive.
2935 oop java_thread = JNIHandles::resolve_non_null(jthread);
2936 JavaThread* thr = java_lang_Thread::thread(java_thread);
2937 if (thread == thr && !thr->has_attached_via_jni()) {
2938 // Thread naming is only supported for the current thread and
2939 // we don't set the name of an attached thread to avoid stepping
2940 // on other programs.
2941 ResourceMark rm(thread);
2942 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2943 os::set_native_thread_name(thread_name);
2944 }
2945 JVM_END
2946
2947 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
2948 oop theCache = thread->scopedValueCache();
2949 return JNIHandles::make_local(THREAD, theCache);
2950 JVM_END
2951
2952 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
2953 jobject theCache))
2954 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
2955 thread->set_scopedValueCache(objs);
2956 JVM_END
2957
2958
2959 // java.lang.Package ////////////////////////////////////////////////////////////////
2960
2961
2962 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
2963 ResourceMark rm(THREAD);
2964 JvmtiVMObjectAllocEventCollector oam;
2965 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2966 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
2967 return (jstring) JNIHandles::make_local(THREAD, result);
2968 JVM_END
2969
2970
2971 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
2972 JvmtiVMObjectAllocEventCollector oam;
2973 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
2974 return (jobjectArray) JNIHandles::make_local(THREAD, result);
2975 JVM_END
2976
2977
2978 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
2979
2980
2981 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
2982 MonitorLocker ml(Heap_lock);
2983 oop ref = Universe::reference_pending_list();
2984 if (ref != nullptr) {
2985 Universe::clear_reference_pending_list();
2986 }
2987 return JNIHandles::make_local(THREAD, ref);
2988 JVM_END
2989
2990 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
2991 MonitorLocker ml(Heap_lock);
2992 return Universe::has_reference_pending_list();
2993 JVM_END
2994
2995 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
2996 MonitorLocker ml(Heap_lock);
2997 while (!Universe::has_reference_pending_list()) {
2998 ml.wait();
2999 }
3000 JVM_END
3001
3002 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3003 oop ref_oop = JNIHandles::resolve_non_null(ref);
3004 // PhantomReference has its own implementation of get().
3005 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3006 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3007 return JNIHandles::make_local(THREAD, referent);
3008 JVM_END
3009
3010 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3011 oop ref_oop = JNIHandles::resolve_non_null(ref);
3012 // PhantomReference has its own implementation of refersTo().
3013 // See: JVM_PhantomReferenceRefersTo
3014 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3015 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3016 return referent == JNIHandles::resolve(o);
3017 JVM_END
3018
3019 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3020 oop ref_oop = JNIHandles::resolve_non_null(ref);
3021 // FinalReference has it's own implementation of clear().
3022 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3023 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3024 // If the referent has already been cleared then done.
3025 // However, if the referent is dead but has not yet been cleared by
3026 // concurrent reference processing, it should NOT be cleared here.
3027 // Instead, clearing should be left to the GC. Clearing it here could
3028 // detectably lose an expected notification, which is impossible with
3029 // STW reference processing. The clearing in enqueue() doesn't have
3030 // this problem, since the enqueue covers the notification, but it's not
3031 // worth the effort to handle that case specially.
3032 return;
3033 }
3034 java_lang_ref_Reference::clear_referent(ref_oop);
3035 JVM_END
3036
3037
3038 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3039
3040
3041 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3042 oop ref_oop = JNIHandles::resolve_non_null(ref);
3043 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3044 return referent == JNIHandles::resolve(o);
3045 JVM_END
3046
3047
3048 // ObjectInputStream ///////////////////////////////////////////////////////////////
3049
3050 // Return the first user-defined class loader up the execution stack, or null
3051 // if only code from the bootstrap or platform class loader is on the stack.
3052
3053 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3054 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3055 InstanceKlass* ik = vfst.method()->method_holder();
3056 oop loader = ik->class_loader();
3057 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3058 return JNIHandles::make_local(THREAD, loader);
3059 }
3060 }
3061 return nullptr;
3062 JVM_END
3063
3064
3065 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3066
3067
3068 // resolve array handle and check arguments
3069 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3070 if (arr == nullptr) {
3071 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3072 }
3073 oop a = JNIHandles::resolve_non_null(arr);
3074 if (!a->is_array()) {
3075 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3076 } else if (type_array_only && !a->is_typeArray()) {
3077 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3078 }
3079 return arrayOop(a);
3080 }
3081
3082
3083 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3084 arrayOop a = check_array(env, arr, false, CHECK_0);
3085 return a->length();
3086 JVM_END
3087
3088
3089 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3090 JvmtiVMObjectAllocEventCollector oam;
3091 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3092 jvalue value;
3093 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3094 oop box = Reflection::box(&value, type, CHECK_NULL);
3095 return JNIHandles::make_local(THREAD, box);
3096 JVM_END
3097
3098
3099 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3100 jvalue value;
3101 value.i = 0; // to initialize value before getting used in CHECK
3102 arrayOop a = check_array(env, arr, true, CHECK_(value));
3103 assert(a->is_typeArray(), "just checking");
3104 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3105 BasicType wide_type = (BasicType) wCode;
3106 if (type != wide_type) {
3107 Reflection::widen(&value, type, wide_type, CHECK_(value));
3108 }
3109 return value;
3110 JVM_END
3111
3112
3113 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3114 arrayOop a = check_array(env, arr, false, CHECK);
3115 oop box = JNIHandles::resolve(val);
3116 jvalue value;
3117 value.i = 0; // to initialize value before getting used in CHECK
3118 BasicType value_type;
3119 if (a->is_objArray()) {
3120 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3121 value_type = Reflection::unbox_for_regular_object(box, &value);
3122 } else {
3123 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3124 }
3125 Reflection::array_set(&value, a, index, value_type, CHECK);
3126 JVM_END
3127
3128
3129 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3130 arrayOop a = check_array(env, arr, true, CHECK);
3131 assert(a->is_typeArray(), "just checking");
3132 BasicType value_type = (BasicType) vCode;
3133 Reflection::array_set(&v, a, index, value_type, CHECK);
3134 JVM_END
3135
3136
3137 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3138 JvmtiVMObjectAllocEventCollector oam;
3139 oop element_mirror = JNIHandles::resolve(eltClass);
3140 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3141 return JNIHandles::make_local(THREAD, result);
3142 JVM_END
3143
3144
3145 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3146 JvmtiVMObjectAllocEventCollector oam;
3147 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3148 oop element_mirror = JNIHandles::resolve(eltClass);
3149 assert(dim_array->is_typeArray(), "just checking");
3150 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3151 return JNIHandles::make_local(THREAD, result);
3152 JVM_END
3153
3154
3155 // Library support ///////////////////////////////////////////////////////////////////////////
3156
3157 JVM_LEAF(void*, JVM_LoadZipLibrary())
3158 return ZipLibrary::handle();
3159 JVM_END
3160
3161 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3162 //%note jvm_ct
3163 char ebuf[1024];
3164 void *load_result;
3165 {
3166 ThreadToNativeFromVM ttnfvm(thread);
3167 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3168 }
3169 if (load_result == nullptr) {
3170 if (throwException) {
3171 char msg[1024];
3172 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3173 // Since 'ebuf' may contain a string encoded using
3174 // platform encoding scheme, we need to pass
3175 // Exceptions::unsafe_to_utf8 to the new_exception method
3176 // as the last argument. See bug 6367357.
3177 Handle h_exception =
3178 Exceptions::new_exception(thread,
3179 vmSymbols::java_lang_UnsatisfiedLinkError(),
3180 msg, Exceptions::unsafe_to_utf8);
3181
3182 THROW_HANDLE_NULL(h_exception);
3183 } else {
3184 log_info(library)("Failed to load library %s", name);
3185 return load_result;
3186 }
3187 }
3188 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3189 return load_result;
3190 JVM_END
3191
3192
3193 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3194 os::dll_unload(handle);
3195 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3196 JVM_END
3197
3198
3199 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3200 void* find_result = os::dll_lookup(handle, name);
3201 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3202 find_result != nullptr ? "Found" : "Failed to find",
3203 name, p2i(handle));
3204 return find_result;
3205 JVM_END
3206
3207
3208 // JNI version ///////////////////////////////////////////////////////////////////////////////
3209
3210 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3211 return Threads::is_supported_jni_version_including_1_1(version);
3212 JVM_END
3213
3214
3215 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3216 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3217 JVM_END
3218
3219 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3220 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3221 JVM_END
3222
3223 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3224 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3225 JVM_END
3226
3227 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3228 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3229 JVM_END
3230
3231 // String support ///////////////////////////////////////////////////////////////////////////
3232
3233 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3234 JvmtiVMObjectAllocEventCollector oam;
3235 if (str == nullptr) return nullptr;
3236 oop string = JNIHandles::resolve_non_null(str);
3237 oop result = StringTable::intern(string, CHECK_NULL);
3238 return (jstring) JNIHandles::make_local(THREAD, result);
3239 JVM_END
3240
3241
3242 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3243
3244 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3245 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3246 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3247 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3248 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3249 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3250
3251
3252 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3253 VM_Exit::block_if_vm_exited();
3254 return new PlatformMutex();
3255 }
3256
3257
3258 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3259 VM_Exit::block_if_vm_exited();
3260 delete ((PlatformMutex*) mon);
3261 }
3262
3263
3264 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3265 VM_Exit::block_if_vm_exited();
3266 ((PlatformMutex*) mon)->lock();
3267 return 0;
3268 }
3269
3270
3271 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3272 VM_Exit::block_if_vm_exited();
3273 ((PlatformMutex*) mon)->unlock();
3274 }
3275
3276
3277 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3278
3279 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3280 Handle loader, jboolean throwError, TRAPS) {
3281 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3282
3283 // Check if we should initialize the class
3284 if (init && klass->is_instance_klass()) {
3285 klass->initialize(CHECK_NULL);
3286 }
3287 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3288 }
3289
3290
3291 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3292
3293 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3294 Handle method_handle;
3295 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3296 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3297 Handle receiver(THREAD, JNIHandles::resolve(obj));
3298 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3299 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3300 jobject res = JNIHandles::make_local(THREAD, result);
3301 if (JvmtiExport::should_post_vm_object_alloc()) {
3302 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3303 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3304 if (java_lang_Class::is_primitive(ret_type)) {
3305 // Only for primitive type vm allocates memory for java object.
3306 // See box() method.
3307 JvmtiExport::post_vm_object_alloc(thread, result);
3308 }
3309 }
3310 return res;
3311 } else {
3312 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3313 }
3314 JVM_END
3315
3316
3317 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3318 oop constructor_mirror = JNIHandles::resolve(c);
3319 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3320 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3321 jobject res = JNIHandles::make_local(THREAD, result);
3322 if (JvmtiExport::should_post_vm_object_alloc()) {
3323 JvmtiExport::post_vm_object_alloc(thread, result);
3324 }
3325 return res;
3326 JVM_END
3327
3328 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3330 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3331 JVM_END
3332
3333 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3334 jclass caller,
3335 jstring interfaceMethodName,
3336 jobject factoryType,
3337 jobject interfaceMethodType,
3338 jobject implementationMember,
3339 jobject dynamicMethodType,
3340 jclass lambdaProxyClass))
3341 #if INCLUDE_CDS
3342 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3343 return;
3344 }
3345
3346 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3347 if (caller_ik->is_hidden()) {
3348 // Hidden classes not of type lambda proxy classes are currently not being archived.
3349 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3350 // registered for archiving.
3351 return;
3352 }
3353 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3354 assert(lambda_ik->is_hidden(), "must be a hidden class");
3355 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3356
3357 Symbol* interface_method_name = nullptr;
3358 if (interfaceMethodName != nullptr) {
3359 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3360 }
3361 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3362 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3363
3364 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3365 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3366
3367 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3368 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3369 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3370
3371 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3372 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3373
3374 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3375 interface_method_type, m, dynamic_method_type, THREAD);
3376 #endif // INCLUDE_CDS
3377 JVM_END
3378
3379 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3380 jclass caller,
3381 jstring interfaceMethodName,
3382 jobject factoryType,
3383 jobject interfaceMethodType,
3384 jobject implementationMember,
3385 jobject dynamicMethodType))
3386 #if INCLUDE_CDS
3387
3388 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3389 implementationMember == nullptr || dynamicMethodType == nullptr) {
3390 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3391 }
3392
3393 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3394 if (!caller_ik->in_aot_cache()) {
3395 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3396 return nullptr;
3397 }
3398
3399 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3400 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3401 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3402
3403 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3404 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3405
3406 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3407 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3408 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3409
3410 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3411 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3412
3413 InstanceKlass* loaded_lambda =
3414 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3415 interface_method_type, m, dynamic_method_type,
3416 CHECK_(nullptr));
3417 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3418 #else
3419 return nullptr;
3420 #endif // INCLUDE_CDS
3421 JVM_END
3422
3423 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3424 if (CDSConfig::is_dumping_static_archive()) {
3425 // We do this so that the default CDS archive can be deterministic.
3426 const char* release = VM_Version::vm_release();
3427 const char* dbg_level = VM_Version::jdk_debug_level();
3428 const char* version = VM_Version::internal_vm_info_string();
3429 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3430 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3431 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3432 seed += (jlong)VM_Version::vm_major_version();
3433 seed += (jlong)VM_Version::vm_minor_version();
3434 seed += (jlong)VM_Version::vm_security_version();
3435 seed += (jlong)VM_Version::vm_patch_version();
3436 if (seed == 0) { // don't let this ever be zero.
3437 seed = 0x87654321;
3438 }
3439 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3440 return seed;
3441 } else {
3442 return 0;
3443 }
3444 JVM_END
3445
3446 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3447 return CDSConfig::get_status();
3448 JVM_END
3449
3450 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3451 #if INCLUDE_CDS
3452 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3453 if (line != nullptr) {
3454 ResourceMark rm(THREAD);
3455 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3456 char* c_line = java_lang_String::as_utf8_string(h_line());
3457 if (CDSConfig::is_dumping_dynamic_archive()) {
3458 // Note: LambdaFormInvokers::append take same format which is not
3459 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3460 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3461 }
3462 if (ClassListWriter::is_enabled()) {
3463 ClassListWriter w;
3464 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3465 }
3466 }
3467 #endif // INCLUDE_CDS
3468 JVM_END
3469
3470 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3471 #if INCLUDE_CDS
3472 ResourceMark rm(THREAD);
3473 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3474 char* file_name = java_lang_String::as_utf8_string(file_handle());
3475 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3476 #endif // INCLUDE_CDS
3477 JVM_END
3478
3479 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3480 #if INCLUDE_CDS
3481 ResourceMark rm(THREAD);
3482 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3483 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3484 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3485 #endif // INCLUDE_CDS
3486 JVM_END
3487
3488 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3489 #if INCLUDE_CDS
3490 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3491 if (!k->is_instance_klass()) {
3492 return false;
3493 } else {
3494 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3495 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3496 // This class will be cached in AOT-initialized state. No need for init barriers.
3497 return false;
3498 } else {
3499 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3500 // must emit barriers to ensure class initialization during production run.
3501 ResourceMark rm(THREAD);
3502 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3503 return true;
3504 }
3505 }
3506 #else
3507 return false;
3508 #endif // INCLUDE_CDS
3509 JVM_END
3510
3511 // Returns an array of all live Thread objects (VM internal JavaThreads,
3512 // jvmti agent threads, and JNI attaching threads are skipped)
3513 // See CR 6404306 regarding JNI attaching threads
3514 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3515 ResourceMark rm(THREAD);
3516 ThreadsListEnumerator tle(THREAD, false, false);
3517 JvmtiVMObjectAllocEventCollector oam;
3518
3519 int num_threads = tle.num_threads();
3520 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3521 objArrayHandle threads_ah(THREAD, r);
3522
3523 for (int i = 0; i < num_threads; i++) {
3524 Handle h = tle.get_threadObj(i);
3525 threads_ah->obj_at_put(i, h());
3526 }
3527
3528 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3529 JVM_END
3530
3531
3532 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3533 // Return StackTraceElement[][], each element is the stack trace of a thread in
3534 // the corresponding entry in the given threads array
3535 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3536 JvmtiVMObjectAllocEventCollector oam;
3537
3538 // Check if threads is null
3539 if (threads == nullptr) {
3540 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3541 }
3542
3543 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3544 objArrayHandle ah(THREAD, a);
3545 int num_threads = ah->length();
3546 // check if threads is non-empty array
3547 if (num_threads == 0) {
3548 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3549 }
3550
3551 // check if threads is not an array of objects of Thread class
3552 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3553 if (k != vmClasses::Thread_klass()) {
3554 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3555 }
3556
3557 ResourceMark rm(THREAD);
3558
3559 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3560 for (int i = 0; i < num_threads; i++) {
3561 oop thread_obj = ah->obj_at(i);
3562 instanceHandle h(THREAD, (instanceOop) thread_obj);
3563 thread_handle_array->append(h);
3564 }
3565
3566 // The JavaThread references in thread_handle_array are validated
3567 // in VM_ThreadDump::doit().
3568 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3569 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3570
3571 JVM_END
3572
3573 // JVM monitoring and management support
3574 JVM_LEAF(void*, JVM_GetManagement(jint version))
3575 return Management::get_jmm_interface(version);
3576 JVM_END
3577
3578 // com.sun.tools.attach.VirtualMachine agent properties support
3579 //
3580 // Initialize the agent properties with the properties maintained in the VM
3581 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3582 ResourceMark rm;
3583
3584 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3585
3586 PUTPROP(props, "sun.java.command", Arguments::java_command());
3587 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3588 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3589 return properties;
3590 JVM_END
3591
3592 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3593 {
3594 JvmtiVMObjectAllocEventCollector oam;
3595
3596 if (ofClass == nullptr) {
3597 return nullptr;
3598 }
3599 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3600 // Special handling for primitive objects
3601 if (java_lang_Class::is_primitive(mirror())) {
3602 return nullptr;
3603 }
3604 Klass* k = java_lang_Class::as_Klass(mirror());
3605 if (!k->is_instance_klass()) {
3606 return nullptr;
3607 }
3608 InstanceKlass* ik = InstanceKlass::cast(k);
3609 int encl_method_class_idx = ik->enclosing_method_class_index();
3610 if (encl_method_class_idx == 0) {
3611 return nullptr;
3612 }
3613 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3614 objArrayHandle dest(THREAD, dest_o);
3615 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3616 dest->obj_at_put(0, enc_k->java_mirror());
3617 int encl_method_method_idx = ik->enclosing_method_method_index();
3618 if (encl_method_method_idx != 0) {
3619 Symbol* sym = ik->constants()->symbol_at(
3620 extract_low_short_from_int(
3621 ik->constants()->name_and_type_at(encl_method_method_idx)));
3622 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3623 dest->obj_at_put(1, str());
3624 sym = ik->constants()->symbol_at(
3625 extract_high_short_from_int(
3626 ik->constants()->name_and_type_at(encl_method_method_idx)));
3627 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3628 dest->obj_at_put(2, str());
3629 }
3630 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3631 }
3632 JVM_END
3633
3634 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3635 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3636 ResourceMark rm(THREAD);
3637
3638 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3639 return nullptr;
3640 }
3641
3642 char** vm_flags = Arguments::jvm_flags_array();
3643 char** vm_args = Arguments::jvm_args_array();
3644 int num_flags = Arguments::num_jvm_flags();
3645 int num_args = Arguments::num_jvm_args();
3646
3647 InstanceKlass* ik = vmClasses::String_klass();
3648 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3649 objArrayHandle result_h(THREAD, r);
3650
3651 int index = 0;
3652 for (int j = 0; j < num_flags; j++, index++) {
3653 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3654 result_h->obj_at_put(index, h());
3655 }
3656 for (int i = 0; i < num_args; i++, index++) {
3657 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3658 result_h->obj_at_put(index, h());
3659 }
3660 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3661 JVM_END
3662
3663 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3664 return os::get_signal_number(name);
3665 JVM_END
3666
3667 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread))
3668 oop vt = JNIHandles::resolve_external_guard(vthread);
3669 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/);
3670 JVM_END
3671
3672 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread))
3673 oop vt = JNIHandles::resolve_external_guard(vthread);
3674 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/);
3675 JVM_END
3676
3677 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3678 oop vt = JNIHandles::resolve_external_guard(vthread);
3679 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/);
3680 JVM_END
3681
3682 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3683 oop vt = JNIHandles::resolve_external_guard(vthread);
3684 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/);
3685 JVM_END
3686
3687 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3688 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3689 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3690 #if INCLUDE_JVMTI
3691 if (!DoJVMTIVirtualThreadTransitions) {
3692 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3693 return;
3694 }
3695 assert(thread->is_disable_suspend() != (bool)enter,
3696 "nested or unbalanced monitor enter/exit is not allowed");
3697 thread->toggle_is_disable_suspend();
3698 #endif
3699 JVM_END
3700
3701 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3702 #if INCLUDE_JFR
3703 freeze_result result = THREAD->last_freeze_fail_result();
3704 assert(result != freeze_ok, "sanity check");
3705 EventVirtualThreadPinned event(UNTIMED);
3706 event.set_starttime(THREAD->last_freeze_fail_time());
3707 if (event.should_commit()) {
3708 ResourceMark rm(THREAD);
3709 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3710 THREAD->post_vthread_pinned_event(&event, str, result);
3711 }
3712 #endif
3713 JVM_END
3714
3715 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3716 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3717 assert(parkEvent != nullptr, "not initialized");
3718
3719 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3720 oop vthread_head = nullptr;
3721 while (true) {
3722 if (list_head.peek() != nullptr) {
3723 for (;;) {
3724 oop head = list_head.resolve();
3725 if (list_head.cmpxchg(head, nullptr) == head) {
3726 return JNIHandles::make_local(THREAD, head);
3727 }
3728 }
3729 }
3730 ThreadBlockInVM tbivm(THREAD);
3731 parkEvent->park();
3732 }
3733 JVM_END
3734
3735 /*
3736 * Return the current class's class file version. The low order 16 bits of the
3737 * returned jint contain the class's major version. The high order 16 bits
3738 * contain the class's minor version.
3739 */
3740 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3741 oop mirror = JNIHandles::resolve_non_null(current);
3742 if (java_lang_Class::is_primitive(mirror)) {
3743 // return latest major version and minor version of 0.
3744 return JVM_CLASSFILE_MAJOR_VERSION;
3745 }
3746 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3747 return (ik->minor_version() << 16) | ik->major_version();
3748 JVM_END
3749
3750 /*
3751 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3752 * get the value will see a materialized value and not a scalar-replaced
3753 * null value.
3754 */
3755 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3756 JVM_EnsureMaterializedForStackWalk(env, value);
3757 JVM_END
3758
3759 /*
3760 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3761 */
3762 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3763 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3764 JVM_END