1 /*
2 * Copyright (c) 1997, 2022, 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 "precompiled.hpp"
26 #include "cds/classListParser.hpp"
27 #include "cds/classListWriter.hpp"
28 #include "cds/dynamicArchive.hpp"
29 #include "cds/heapShared.hpp"
30 #include "cds/lambdaFormInvokers.hpp"
31 #include "classfile/classFileStream.hpp"
32 #include "classfile/classLoader.inline.hpp"
33 #include "classfile/classLoaderData.hpp"
34 #include "classfile/classLoaderData.inline.hpp"
35 #include "classfile/classLoadInfo.hpp"
36 #include "classfile/javaAssertions.hpp"
37 #include "classfile/javaClasses.inline.hpp"
38 #include "classfile/moduleEntry.hpp"
39 #include "classfile/modules.hpp"
40 #include "classfile/packageEntry.hpp"
41 #include "classfile/stringTable.hpp"
42 #include "classfile/symbolTable.hpp"
43 #include "classfile/systemDictionary.hpp"
44 #include "classfile/vmClasses.hpp"
45 #include "classfile/vmSymbols.hpp"
46 #include "gc/shared/collectedHeap.inline.hpp"
47 #include "interpreter/bytecode.hpp"
48 #include "interpreter/bytecodeUtils.hpp"
49 #include "jfr/jfrEvents.hpp"
50 #include "jvm.h"
51 #include "logging/log.hpp"
52 #include "memory/oopFactory.hpp"
53 #include "memory/referenceType.hpp"
54 #include "memory/resourceArea.hpp"
55 #include "memory/universe.hpp"
56 #include "oops/access.inline.hpp"
57 #include "oops/constantPool.hpp"
58 #include "oops/fieldStreams.inline.hpp"
59 #include "oops/flatArrayKlass.hpp"
60 #include "oops/instanceKlass.hpp"
61 #include "oops/klass.inline.hpp"
62 #include "oops/method.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "prims/jvm_misc.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiThreadState.inline.hpp"
70 #include "prims/stackwalk.hpp"
71 #include "runtime/arguments.hpp"
72 #include "runtime/atomic.hpp"
73 #include "runtime/continuation.hpp"
74 #include "runtime/globals_extension.hpp"
75 #include "runtime/handles.inline.hpp"
76 #include "runtime/init.hpp"
77 #include "runtime/interfaceSupport.inline.hpp"
78 #include "runtime/deoptimization.hpp"
79 #include "runtime/handshake.hpp"
80 #include "runtime/java.hpp"
81 #include "runtime/javaCalls.hpp"
82 #include "runtime/javaThread.hpp"
83 #include "runtime/jfieldIDWorkaround.hpp"
84 #include "runtime/jniHandles.inline.hpp"
85 #include "runtime/os.inline.hpp"
86 #include "runtime/osThread.hpp"
87 #include "runtime/perfData.hpp"
88 #include "runtime/reflection.hpp"
89 #include "runtime/synchronizer.hpp"
90 #include "runtime/threadIdentifier.hpp"
91 #include "runtime/threadSMR.hpp"
92 #include "runtime/vframe.inline.hpp"
93 #include "runtime/vmOperations.hpp"
94 #include "runtime/vm_version.hpp"
95 #include "services/attachListener.hpp"
96 #include "services/management.hpp"
97 #include "services/threadService.hpp"
98 #include "utilities/copy.hpp"
99 #include "utilities/defaultStream.hpp"
100 #include "utilities/dtrace.hpp"
101 #include "utilities/events.hpp"
102 #include "utilities/macros.hpp"
103 #include "utilities/utf8.hpp"
104 #if INCLUDE_CDS
105 #include "classfile/systemDictionaryShared.hpp"
106 #endif
107 #if INCLUDE_JFR
108 #include "jfr/jfr.hpp"
109 #endif
110 #if INCLUDE_MANAGEMENT
111 #include "services/finalizerService.hpp"
112 #endif
113
114 #include <errno.h>
115
116 /*
117 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
118 such ctors and calls MUST NOT come between an oop declaration/init and its
119 usage because if objects are move this may cause various memory stomps, bus
120 errors and segfaults. Here is a cookbook for causing so called "naked oop
121 failures":
122
123 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
124 // Object address to be held directly in mirror & not visible to GC
125 oop mirror = JNIHandles::resolve_non_null(ofClass);
126
127 // If this ctor can hit a safepoint, moving objects around, then
128 ComplexConstructor foo;
129
130 // Boom! mirror may point to JUNK instead of the intended object
131 (some dereference of mirror)
132
133 // Here's another call that may block for GC, making mirror stale
134 MutexLocker ml(some_lock);
135
136 // And here's an initializer that can result in a stale oop
137 // all in one step.
138 oop o = call_that_can_throw_exception(TRAPS);
139
140
141 The solution is to keep the oop declaration BELOW the ctor or function
142 call that might cause a GC, do another resolve to reassign the oop, or
143 consider use of a Handle instead of an oop so there is immunity from object
144 motion. But note that the "QUICK" entries below do not have a handlemark
145 and thus can only support use of handles passed in.
146 */
147
148 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
149 ResourceMark rm;
150 int line_number = -1;
151 const char * source_file = NULL;
152 const char * trace = "explicit";
153 InstanceKlass* caller = NULL;
154 JavaThread* jthread = THREAD;
155 if (jthread->has_last_Java_frame()) {
156 vframeStream vfst(jthread);
157
158 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
159 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
160 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
161 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
162 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
163
164 Method* last_caller = NULL;
165
166 while (!vfst.at_end()) {
167 Method* m = vfst.method();
168 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
169 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
170 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
171 break;
172 }
173 last_caller = m;
174 vfst.next();
175 }
176 // if this is called from Class.forName0 and that is called from Class.forName,
177 // then print the caller of Class.forName. If this is Class.loadClass, then print
178 // that caller, otherwise keep quiet since this should be picked up elsewhere.
179 bool found_it = false;
180 if (!vfst.at_end() &&
181 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
182 vfst.method()->name() == vmSymbols::forName0_name()) {
183 vfst.next();
184 if (!vfst.at_end() &&
185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
186 vfst.method()->name() == vmSymbols::forName_name()) {
187 vfst.next();
188 found_it = true;
189 }
190 } else if (last_caller != NULL &&
191 last_caller->method_holder()->name() ==
192 vmSymbols::java_lang_ClassLoader() &&
193 last_caller->name() == vmSymbols::loadClass_name()) {
194 found_it = true;
195 } else if (!vfst.at_end()) {
196 if (vfst.method()->is_native()) {
197 // JNI call
198 found_it = true;
199 }
200 }
201 if (found_it && !vfst.at_end()) {
202 // found the caller
203 caller = vfst.method()->method_holder();
204 line_number = vfst.method()->line_number_from_bci(vfst.bci());
205 if (line_number == -1) {
206 // show method name if it's a native method
207 trace = vfst.method()->name_and_sig_as_C_string();
208 }
209 Symbol* s = caller->source_file_name();
210 if (s != NULL) {
211 source_file = s->as_C_string();
212 }
213 }
214 }
215 if (caller != NULL) {
216 if (to_class != caller) {
217 const char * from = caller->external_name();
218 const char * to = to_class->external_name();
219 // print in a single call to reduce interleaving between threads
220 if (source_file != NULL) {
221 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
222 } else {
223 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
224 }
225 }
226 }
227 }
228
229 void trace_class_resolution(Klass* to_class) {
230 EXCEPTION_MARK;
231 trace_class_resolution_impl(to_class, THREAD);
232 if (HAS_PENDING_EXCEPTION) {
233 CLEAR_PENDING_EXCEPTION;
234 }
235 }
236
237 // java.lang.System //////////////////////////////////////////////////////////////////////
238
239
240 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
241 return os::javaTimeMillis();
242 JVM_END
243
244 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
245 return os::javaTimeNanos();
246 JVM_END
247
248 // The function below is actually exposed by jdk.internal.misc.VM and not
249 // java.lang.System, but we choose to keep it here so that it stays next
250 // to JVM_CurrentTimeMillis and JVM_NanoTime
251
252 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
253 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
254
255 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
256 jlong seconds;
257 jlong nanos;
258
259 os::javaTimeSystemUTC(seconds, nanos);
260
261 // We're going to verify that the result can fit in a long.
262 // For that we need the difference in seconds between 'seconds'
263 // and 'offset_secs' to be such that:
264 // |seconds - offset_secs| < (2^63/10^9)
265 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
266 // which makes |seconds - offset_secs| < 2^33
267 // and we will prefer +/- 2^32 as the maximum acceptable diff
268 // as 2^32 has a more natural feel than 2^33...
269 //
270 // So if |seconds - offset_secs| >= 2^32 - we return a special
271 // sentinel value (-1) which the caller should take as an
272 // exception value indicating that the offset given to us is
273 // too far from range of the current time - leading to too big
274 // a nano adjustment. The caller is expected to recover by
275 // computing a more accurate offset and calling this method
276 // again. (For the record 2^32 secs is ~136 years, so that
277 // should rarely happen)
278 //
279 jlong diff = seconds - offset_secs;
280 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
281 return -1; // sentinel value: the offset is too far off the target
282 }
283
284 // return the adjustment. If you compute a time by adding
285 // this number of nanoseconds along with the number of seconds
286 // in the offset you should get the current UTC time.
287 return (diff * (jlong)1000000000) + nanos;
288 JVM_END
289
290 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
291 jobject dst, jint dst_pos, jint length))
292 // Check if we have null pointers
293 if (src == NULL || dst == NULL) {
294 THROW(vmSymbols::java_lang_NullPointerException());
295 }
296 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
297 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
298 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
299 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
300 // Do copy
301 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
302 JVM_END
303
304
305 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
306 JavaValue r(T_OBJECT);
307 // public synchronized Object put(Object key, Object value);
308 HandleMark hm(THREAD);
309 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
310 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
311 JavaCalls::call_virtual(&r,
312 props,
313 vmClasses::Properties_klass(),
314 vmSymbols::put_name(),
315 vmSymbols::object_object_object_signature(),
316 key_str,
317 value_str,
318 THREAD);
319 }
320
321
322 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
323
324 /*
325 * Return all of the system properties in a Java String array with alternating
326 * names and values from the jvm SystemProperty.
327 * Which includes some internal and all commandline -D defined properties.
328 */
329 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
330 ResourceMark rm(THREAD);
331 HandleMark hm(THREAD);
332 int ndx = 0;
333 int fixedCount = 2;
334
335 SystemProperty* p = Arguments::system_properties();
336 int count = Arguments::PropertyList_count(p);
337
338 // Allocate result String array
339 InstanceKlass* ik = vmClasses::String_klass();
340 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
341 objArrayHandle result_h(THREAD, r);
342
343 while (p != NULL) {
344 const char * key = p->key();
345 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
346 const char * value = p->value();
347 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
348 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
349 result_h->obj_at_put(ndx * 2, key_str());
350 result_h->obj_at_put(ndx * 2 + 1, value_str());
351 ndx++;
352 }
353 p = p->next();
354 }
355
356 // Convert the -XX:MaxDirectMemorySize= command line flag
357 // to the sun.nio.MaxDirectMemorySize property.
358 // Do this after setting user properties to prevent people
359 // from setting the value with a -D option, as requested.
360 // Leave empty if not supplied
361 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
362 char as_chars[256];
363 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
364 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
365 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
366 result_h->obj_at_put(ndx * 2, key_str());
367 result_h->obj_at_put(ndx * 2 + 1, value_str());
368 ndx++;
369 }
370
371 // JVM monitoring and management support
372 // Add the sun.management.compiler property for the compiler's name
373 {
374 #undef CSIZE
375 #if defined(_LP64) || defined(_WIN64)
376 #define CSIZE "64-Bit "
377 #else
378 #define CSIZE
379 #endif // 64bit
380
381 #if COMPILER1_AND_COMPILER2
382 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
383 #else
384 #if defined(COMPILER1)
385 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
386 #elif defined(COMPILER2)
387 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
388 #elif INCLUDE_JVMCI
389 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
390 #else
391 const char* compiler_name = "";
392 #endif // compilers
393 #endif // COMPILER1_AND_COMPILER2
394
395 if (*compiler_name != '\0' &&
396 (Arguments::mode() != Arguments::_int)) {
397 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
398 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
399 result_h->obj_at_put(ndx * 2, key_str());
400 result_h->obj_at_put(ndx * 2 + 1, value_str());
401 ndx++;
402 }
403 }
404
405 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
406 JVM_END
407
408
409 /*
410 * Return the temporary directory that the VM uses for the attach
411 * and perf data files.
412 *
413 * It is important that this directory is well-known and the
414 * same for all VM instances. It cannot be affected by configuration
415 * variables such as java.io.tmpdir.
416 */
417 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
418 HandleMark hm(THREAD);
419 const char* temp_dir = os::get_temp_directory();
420 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
421 return (jstring) JNIHandles::make_local(THREAD, h());
422 JVM_END
423
424
425 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
426
427 extern volatile jint vm_created;
428
429 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
430 #if INCLUDE_CDS
431 // Link all classes for dynamic CDS dumping before vm exit.
432 if (DynamicArchive::should_dump_at_vm_exit()) {
433 DynamicArchive::prepare_for_dump_at_exit();
434 }
435 #endif
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 // java.lang.Throwable //////////////////////////////////////////////////////
503
504 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
505 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
506 java_lang_Throwable::fill_in_stack_trace(exception);
507 JVM_END
508
509 // java.lang.NullPointerException ///////////////////////////////////////////
510
511 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
512 if (!ShowCodeDetailsInExceptionMessages) return NULL;
513
514 oop exc = JNIHandles::resolve_non_null(throwable);
515
516 Method* method;
517 int bci;
518 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
519 return NULL;
520 }
521 if (method->is_native()) {
522 return NULL;
523 }
524
525 stringStream ss;
526 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
527 if (ok) {
528 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
529 return (jstring) JNIHandles::make_local(THREAD, result);
530 } else {
531 return NULL;
532 }
533 JVM_END
534
535 // java.lang.StackTraceElement //////////////////////////////////////////////
536
537
538 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
539 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
540 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
541 objArrayHandle stack_trace(THREAD, st);
542 // Fill in the allocated stack trace
543 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
544 JVM_END
545
546
547 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
548 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
549 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
550 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
551 JVM_END
552
553
554 // java.lang.StackWalker //////////////////////////////////////////////////////
555
556
557 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
558 jint skip_frames, jobject contScope, jobject cont,
559 jint frame_count, jint start_index, jobjectArray frames))
560 if (!thread->has_last_Java_frame()) {
561 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
562 }
563
564 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
565 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
566 Handle cont_h(THREAD, JNIHandles::resolve(cont));
567 // frames array is a Class<?>[] array when only getting caller reference,
568 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
569 // be null.
570 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
571 objArrayHandle frames_array_h(THREAD, fa);
572
573 int limit = start_index + frame_count;
574 if (frames_array_h->length() < limit) {
575 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
576 }
577
578 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
579 frame_count, start_index, frames_array_h, CHECK_NULL);
580 return JNIHandles::make_local(THREAD, result);
581 JVM_END
582
583
584 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
585 jint frame_count, jint start_index,
586 jobjectArray frames))
587 // frames array is a Class<?>[] array when only getting caller reference,
588 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
589 // be null.
590 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
591 objArrayHandle frames_array_h(THREAD, fa);
592
593 int limit = start_index+frame_count;
594 if (frames_array_h->length() < limit) {
595 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
596 }
597
598 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
599 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
600 start_index, frames_array_h, THREAD);
601 JVM_END
602
603 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
604 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
605 objArrayHandle frames_array_h(THREAD, fa);
606 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
607 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
608
609 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
610 JVM_END
611
612 // java.lang.Object ///////////////////////////////////////////////
613
614
615 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
616 // as implemented in the classic virtual machine; return 0 if object is NULL
617 if (handle == NULL) {
618 return 0;
619 }
620 oop obj = JNIHandles::resolve_non_null(handle);
621 if (EnableValhalla && obj->klass()->is_inline_klass()) {
622 JavaValue result(T_INT);
623 JavaCallArguments args;
624 Handle ho(THREAD, obj);
625 args.push_oop(ho);
626 methodHandle method(THREAD, Universe::value_object_hash_code_method());
627 JavaCalls::call(&result, method, &args, THREAD);
628 if (HAS_PENDING_EXCEPTION) {
629 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
630 Handle e(THREAD, PENDING_EXCEPTION);
631 CLEAR_PENDING_EXCEPTION;
632 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
633 }
634 }
635 return result.get_jint();
636 } else {
637 return ObjectSynchronizer::FastHashCode(THREAD, obj);
638 }
639 JVM_END
640
641
642 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
643 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
644 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
645 if (JvmtiExport::should_post_monitor_wait()) {
646 JvmtiExport::post_monitor_wait(thread, obj(), ms);
647
648 // The current thread already owns the monitor and it has not yet
649 // been added to the wait queue so the current thread cannot be
650 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
651 // event handler cannot accidentally consume an unpark() meant for
652 // the ParkEvent associated with this ObjectMonitor.
653 }
654 ObjectSynchronizer::wait(obj, ms, CHECK);
655 JVM_END
656
657
658 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
659 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
660 ObjectSynchronizer::notify(obj, CHECK);
661 JVM_END
662
663
664 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
665 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
666 ObjectSynchronizer::notifyall(obj, CHECK);
667 JVM_END
668
669
670 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
671 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
672 Klass* klass = obj->klass();
673 JvmtiVMObjectAllocEventCollector oam;
674
675 #ifdef ASSERT
676 // Just checking that the cloneable flag is set correct
677 if (obj->is_array()) {
678 guarantee(klass->is_cloneable(), "all arrays are cloneable");
679 } else {
680 guarantee(obj->is_instance(), "should be instanceOop");
681 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
682 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
683 }
684 #endif
685
686 // Check if class of obj supports the Cloneable interface.
687 // All arrays are considered to be cloneable (See JLS 20.1.5).
688 // All j.l.r.Reference classes are considered non-cloneable.
689 if (!klass->is_cloneable() ||
690 klass->is_inline_klass() ||
691 (klass->is_instance_klass() &&
692 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
693 ResourceMark rm(THREAD);
694 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
695 }
696
697 // Make shallow object copy
698 const size_t size = obj->size();
699 oop new_obj_oop = NULL;
700 if (obj->is_array()) {
701 const int length = ((arrayOop)obj())->length();
702 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
703 /* do_zero */ true, CHECK_NULL);
704 } else {
705 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
706 }
707
708 HeapAccess<>::clone(obj(), new_obj_oop, size);
709
710 Handle new_obj(THREAD, new_obj_oop);
711 // Caution: this involves a java upcall, so the clone should be
712 // "gc-robust" by this stage.
713 if (klass->has_finalizer()) {
714 assert(obj->is_instance(), "should be instanceOop");
715 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
716 new_obj = Handle(THREAD, new_obj_oop);
717 }
718
719 return JNIHandles::make_local(THREAD, new_obj());
720 JVM_END
721
722 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
723
724 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
725 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
726 JVM_END
727
728 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
729 return InstanceKlass::is_finalization_enabled();
730 JVM_END
731
732 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
733
734 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
735 CONT_RegisterNativeMethods(env, cls);
736 JVM_END
737
738 // java.io.File ///////////////////////////////////////////////////////////////
739
740 JVM_LEAF(char*, JVM_NativePath(char* path))
741 return os::native_path(path);
742 JVM_END
743
744
745 // Misc. class handling ///////////////////////////////////////////////////////////
746
747
748 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
749 // Getting the class of the caller frame.
750 //
751 // The call stack at this point looks something like this:
752 //
753 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
754 // [1] [ @CallerSensitive API.method ]
755 // [.] [ (skipped intermediate frames) ]
756 // [n] [ caller ]
757 vframeStream vfst(thread);
758 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
759 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
760 Method* m = vfst.method();
761 assert(m != NULL, "sanity");
762 switch (n) {
763 case 0:
764 // This must only be called from Reflection.getCallerClass
765 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
766 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
767 }
768 // fall-through
769 case 1:
770 // Frame 0 and 1 must be caller sensitive.
771 if (!m->caller_sensitive()) {
772 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
773 }
774 break;
775 default:
776 if (!m->is_ignored_by_security_stack_walk()) {
777 // We have reached the desired frame; return the holder class.
778 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
779 }
780 break;
781 }
782 }
783 return NULL;
784 JVM_END
785
786
787 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
788 oop mirror = NULL;
789 BasicType t = name2type(utf);
790 if (t != T_ILLEGAL && !is_reference_type(t)) {
791 mirror = Universe::java_mirror(t);
792 }
793 if (mirror == NULL) {
794 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
795 } else {
796 return (jclass) JNIHandles::make_local(THREAD, mirror);
797 }
798 JVM_END
799
800
801 // Returns a class loaded by the bootstrap class loader; or null
802 // if not found. ClassNotFoundException is not thrown.
803 // FindClassFromBootLoader is exported to the launcher for windows.
804 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
805 const char* name))
806 // Java libraries should ensure that name is never null or illegal.
807 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
808 // It's impossible to create this class; the name cannot fit
809 // into the constant pool.
810 return NULL;
811 }
812 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
813
814 TempNewSymbol h_name = SymbolTable::new_symbol(name);
815 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
816 if (k == NULL) {
817 return NULL;
818 }
819
820 if (log_is_enabled(Debug, class, resolve)) {
821 trace_class_resolution(k);
822 }
823 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
824 JVM_END
825
826 // Find a class with this name in this loader, using the caller's protection domain.
827 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
828 jboolean init, jobject loader,
829 jclass caller))
830 TempNewSymbol h_name =
831 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
832 CHECK_NULL);
833
834 oop loader_oop = JNIHandles::resolve(loader);
835 oop from_class = JNIHandles::resolve(caller);
836 oop protection_domain = NULL;
837 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
838 // NPE. Put it in another way, the bootstrap class loader has all permission and
839 // thus no checkPackageAccess equivalence in the VM class loader.
840 // The caller is also passed as NULL by the java code if there is no security
841 // manager to avoid the performance cost of getting the calling class.
842 if (from_class != NULL && loader_oop != NULL) {
843 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
844 }
845
846 Handle h_loader(THREAD, loader_oop);
847 Handle h_prot(THREAD, protection_domain);
848 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
849 h_prot, false, THREAD);
850
851 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
852 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
853 }
854 return result;
855 JVM_END
856
857 // Currently only called from the old verifier.
858 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
859 jboolean init, jclass from))
860 TempNewSymbol h_name =
861 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
862 CHECK_NULL);
863 oop from_class_oop = JNIHandles::resolve(from);
864 Klass* from_class = (from_class_oop == NULL)
865 ? (Klass*)NULL
866 : java_lang_Class::as_Klass(from_class_oop);
867 oop class_loader = NULL;
868 oop protection_domain = NULL;
869 if (from_class != NULL) {
870 class_loader = from_class->class_loader();
871 protection_domain = from_class->protection_domain();
872 }
873 Handle h_loader(THREAD, class_loader);
874 Handle h_prot (THREAD, protection_domain);
875 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
876 h_prot, true, thread);
877
878 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
879 // this function is generally only used for class loading during verification.
880 ResourceMark rm;
881 oop from_mirror = JNIHandles::resolve_non_null(from);
882 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
883 const char * from_name = from_class->external_name();
884
885 oop mirror = JNIHandles::resolve_non_null(result);
886 Klass* to_class = java_lang_Class::as_Klass(mirror);
887 const char * to = to_class->external_name();
888 log_debug(class, resolve)("%s %s (verification)", from_name, to);
889 }
890
891 return result;
892 JVM_END
893
894 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
895 static jclass jvm_define_class_common(const char *name,
896 jobject loader, const jbyte *buf,
897 jsize len, jobject pd, const char *source,
898 TRAPS) {
899 if (source == NULL) source = "__JVM_DefineClass__";
900
901 JavaThread* jt = THREAD;
902
903 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
904 ClassLoader::perf_define_appclass_selftime(),
905 ClassLoader::perf_define_appclasses(),
906 jt->get_thread_stat()->perf_recursion_counts_addr(),
907 jt->get_thread_stat()->perf_timers_addr(),
908 PerfClassTraceTime::DEFINE_CLASS);
909
910 if (UsePerfData) {
911 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
912 }
913
914 // Class resolution will get the class name from the .class stream if the name is null.
915 TempNewSymbol class_name = name == NULL ? NULL :
916 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
917 CHECK_NULL);
918
919 ResourceMark rm(THREAD);
920 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
921 Handle class_loader (THREAD, JNIHandles::resolve(loader));
922 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
923 ClassLoadInfo cl_info(protection_domain);
924 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
925 class_loader,
926 cl_info,
927 CHECK_NULL);
928
929 if (log_is_enabled(Debug, class, resolve)) {
930 trace_class_resolution(k);
931 }
932
933 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
934 }
935
936 enum {
937 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
938 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
939 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
940 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
941 };
942
943 /*
944 * Define a class with the specified flags that indicates if it's a nestmate,
945 * hidden, or strongly referenced from class loader.
946 */
947 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
948 const jbyte *buf, jsize len, jobject pd,
949 jboolean init, int flags, jobject classData, TRAPS) {
950 ResourceMark rm(THREAD);
951
952 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
953 // Lookup class must be a non-null instance
954 if (lookup_k == NULL) {
955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
956 }
957 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
958
959 Handle class_loader (THREAD, lookup_k->class_loader());
960
961 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
962 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
963 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
964 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
965
966 InstanceKlass* host_class = NULL;
967 if (is_nestmate) {
968 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
969 }
970
971 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
972 name,
973 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
974 is_nestmate ? host_class->external_name() : "",
975 is_hidden ? "hidden" : "not hidden",
976 is_strong ? "strong" : "weak",
977 vm_annotations ? "with vm annotations" : "without vm annotation");
978
979 if (!is_hidden) {
980 // classData is only applicable for hidden classes
981 if (classData != NULL) {
982 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
983 }
984 if (is_nestmate) {
985 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
986 }
987 if (!is_strong) {
988 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
989 }
990 if (vm_annotations) {
991 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
992 }
993 if (flags != STRONG_LOADER_LINK) {
994 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
995 err_msg("invalid flag 0x%x", flags));
996 }
997 }
998
999 // Class resolution will get the class name from the .class stream if the name is null.
1000 TempNewSymbol class_name = name == NULL ? NULL :
1001 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1002 CHECK_NULL);
1003
1004 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1005 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1006 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1007
1008 InstanceKlass* ik = NULL;
1009 if (!is_hidden) {
1010 ClassLoadInfo cl_info(protection_domain);
1011 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1012 class_loader,
1013 cl_info,
1014 CHECK_NULL);
1015
1016 if (log_is_enabled(Debug, class, resolve)) {
1017 trace_class_resolution(ik);
1018 }
1019 } else { // hidden
1020 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1021 ClassLoadInfo cl_info(protection_domain,
1022 host_class,
1023 classData_h,
1024 is_hidden,
1025 is_strong,
1026 vm_annotations);
1027 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1028 class_loader,
1029 cl_info,
1030 CHECK_NULL);
1031
1032 // The hidden class loader data has been artificially been kept alive to
1033 // this point. The mirror and any instances of this class have to keep
1034 // it alive afterwards.
1035 ik->class_loader_data()->dec_keep_alive();
1036
1037 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1038 ModuleEntry* module = ik->module();
1039 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1040 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1041 module_name,
1042 ik->external_name(),
1043 host_class->external_name(),
1044 ik->is_hidden() ? "is hidden" : "is not hidden");
1045 }
1046 }
1047 assert(Reflection::is_same_class_package(lookup_k, ik),
1048 "lookup class and defined class are in different packages");
1049
1050 if (init) {
1051 ik->initialize(CHECK_NULL);
1052 } else {
1053 ik->link_class(CHECK_NULL);
1054 }
1055
1056 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1057 }
1058
1059 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1060 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1061 JVM_END
1062
1063 /*
1064 * Define a class with the specified lookup class.
1065 * lookup: Lookup class
1066 * name: the name of the class
1067 * buf: class bytes
1068 * len: length of class bytes
1069 * pd: protection domain
1070 * init: initialize the class
1071 * flags: properties of the class
1072 * classData: private static pre-initialized field
1073 */
1074 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1075 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1076
1077 if (lookup == NULL) {
1078 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1079 }
1080
1081 assert(buf != NULL, "buf must not be NULL");
1082
1083 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1084 JVM_END
1085
1086 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1087
1088 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1089 JVM_END
1090
1091 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1092 ResourceMark rm(THREAD);
1093
1094 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1095 char* str = java_lang_String::as_utf8_string(h_name());
1096
1097 // Sanity check, don't expect null
1098 if (str == NULL) return NULL;
1099
1100 // Internalize the string, converting '.' to '/' in string.
1101 char* p = (char*)str;
1102 while (*p != '\0') {
1103 if (*p == '.') {
1104 *p = '/';
1105 }
1106 p++;
1107 }
1108
1109 const int str_len = (int)(p - str);
1110 if (str_len > Symbol::max_length()) {
1111 // It's impossible to create this class; the name cannot fit
1112 // into the constant pool.
1113 return NULL;
1114 }
1115 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1116
1117 // Security Note:
1118 // The Java level wrapper will perform the necessary security check allowing
1119 // us to pass the NULL as the initiating class loader.
1120 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1121 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1122 h_loader,
1123 Handle());
1124 #if INCLUDE_CDS
1125 if (k == NULL) {
1126 // If the class is not already loaded, try to see if it's in the shared
1127 // archive for the current classloader (h_loader).
1128 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1129 }
1130 #endif
1131 return (k == NULL) ? NULL :
1132 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1133 JVM_END
1134
1135 // Module support //////////////////////////////////////////////////////////////////////////////
1136
1137 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1138 jstring location, jobjectArray packages))
1139 Handle h_module (THREAD, JNIHandles::resolve(module));
1140 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1141 JVM_END
1142
1143 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1144 Handle h_module (THREAD, JNIHandles::resolve(module));
1145 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1146 JVM_END
1147
1148 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1149 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1150 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1151 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1152 JVM_END
1153
1154 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1155 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1156 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1157 JVM_END
1158
1159 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1160 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1161 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1162 JVM_END
1163
1164 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1165 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1166 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1167 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1168 JVM_END
1169
1170 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1171 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1172 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1173 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1174 JVM_END
1175
1176 // Reflection support //////////////////////////////////////////////////////////////////////////////
1177
1178 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1179 assert (cls != NULL, "illegal class");
1180 JvmtiVMObjectAllocEventCollector oam;
1181 ResourceMark rm(THREAD);
1182 HandleMark hm(THREAD);
1183 Handle java_class(THREAD, JNIHandles::resolve(cls));
1184 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1185 return (jstring) JNIHandles::make_local(THREAD, result);
1186 JVM_END
1187
1188
1189 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1190 JvmtiVMObjectAllocEventCollector oam;
1191 oop mirror = JNIHandles::resolve_non_null(cls);
1192
1193 // Special handling for primitive objects
1194 if (java_lang_Class::is_primitive(mirror)) {
1195 // Primitive objects does not have any interfaces
1196 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1197 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1198 }
1199
1200 Klass* klass = java_lang_Class::as_Klass(mirror);
1201 // Figure size of result array
1202 int size;
1203 if (klass->is_instance_klass()) {
1204 InstanceKlass* ik = InstanceKlass::cast(klass);
1205 size = ik->local_interfaces()->length();
1206 } else {
1207 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1208 size = 2;
1209 }
1210
1211 // Allocate result array
1212 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1213 objArrayHandle result (THREAD, r);
1214 // Fill in result
1215 if (klass->is_instance_klass()) {
1216 // Regular instance klass, fill in all local interfaces
1217 for (int index = 0; index < size; index++) {
1218 InstanceKlass* ik = InstanceKlass::cast(klass);
1219 Klass* k = ik->local_interfaces()->at(index);
1220 result->obj_at_put(index, k->java_mirror());
1221 }
1222 } else {
1223 // All arrays implement java.lang.Cloneable and java.io.Serializable
1224 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1225 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1226 }
1227 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1228 JVM_END
1229
1230
1231 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1232 oop mirror = JNIHandles::resolve_non_null(cls);
1233 if (java_lang_Class::is_primitive(mirror)) {
1234 return JNI_FALSE;
1235 }
1236 Klass* k = java_lang_Class::as_Klass(mirror);
1237 jboolean result = k->is_interface();
1238 assert(!result || k->is_instance_klass(),
1239 "all interfaces are instance types");
1240 // The compiler intrinsic for isInterface tests the
1241 // Klass::_access_flags bits in the same way.
1242 return result;
1243 JVM_END
1244
1245 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1246 oop mirror = JNIHandles::resolve_non_null(cls);
1247 if (java_lang_Class::is_primitive(mirror)) {
1248 return JNI_FALSE;
1249 }
1250 Klass* k = java_lang_Class::as_Klass(mirror);
1251 return k->is_hidden();
1252 JVM_END
1253
1254 JVM_ENTRY(jboolean, JVM_IsIdentityClass(JNIEnv *env, jclass cls))
1255 oop mirror = JNIHandles::resolve_non_null(cls);
1256 if (java_lang_Class::is_primitive(mirror)) {
1257 return JNI_FALSE;
1258 }
1259 Klass* k = java_lang_Class::as_Klass(mirror);
1260 if (EnableValhalla) {
1261 return k->is_array_klass() || k->is_identity_class();
1262 } else {
1263 return k->is_interface() ? JNI_FALSE : JNI_TRUE;
1264 }
1265 JVM_END
1266
1267 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1268 JvmtiVMObjectAllocEventCollector oam;
1269 oop mirror = JNIHandles::resolve_non_null(cls);
1270 if (java_lang_Class::is_primitive(mirror)) {
1271 // There are no signers for primitive types
1272 return NULL;
1273 }
1274
1275 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1276
1277 // If there are no signers set in the class, or if the class
1278 // is an array, return NULL.
1279 if (signers == NULL) return NULL;
1280
1281 // copy of the signers array
1282 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1283 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1284 for (int index = 0; index < signers->length(); index++) {
1285 signers_copy->obj_at_put(index, signers->obj_at(index));
1286 }
1287
1288 // return the copy
1289 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1290 JVM_END
1291
1292
1293 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1294 oop mirror = JNIHandles::resolve_non_null(cls);
1295 if (!java_lang_Class::is_primitive(mirror)) {
1296 // This call is ignored for primitive types and arrays.
1297 // Signers are only set once, ClassLoader.java, and thus shouldn't
1298 // be called with an array. Only the bootstrap loader creates arrays.
1299 Klass* k = java_lang_Class::as_Klass(mirror);
1300 if (k->is_instance_klass()) {
1301 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1302 }
1303 }
1304 JVM_END
1305
1306
1307 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1308 oop mirror = JNIHandles::resolve_non_null(cls);
1309 if (mirror == NULL) {
1310 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1311 }
1312
1313 if (java_lang_Class::is_primitive(mirror)) {
1314 // Primitive types does not have a protection domain.
1315 return NULL;
1316 }
1317
1318 oop pd = java_lang_Class::protection_domain(mirror);
1319 return (jobject) JNIHandles::make_local(THREAD, pd);
1320 JVM_END
1321
1322
1323 // Returns the inherited_access_control_context field of the running thread.
1324 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1325 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1326 return JNIHandles::make_local(THREAD, result);
1327 JVM_END
1328
1329 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1330 if (!UsePrivilegedStack) return NULL;
1331
1332 ResourceMark rm(THREAD);
1333 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1334 JvmtiVMObjectAllocEventCollector oam;
1335
1336 // count the protection domains on the execution stack. We collapse
1337 // duplicate consecutive protection domains into a single one, as
1338 // well as stopping when we hit a privileged frame.
1339
1340 oop previous_protection_domain = NULL;
1341 Handle privileged_context(thread, NULL);
1342 bool is_privileged = false;
1343 oop protection_domain = NULL;
1344
1345 // Iterate through Java frames
1346 vframeStream vfst(thread);
1347 for(; !vfst.at_end(); vfst.next()) {
1348 // get method of frame
1349 Method* method = vfst.method();
1350
1351 // stop at the first privileged frame
1352 if (method->method_holder() == vmClasses::AccessController_klass() &&
1353 method->name() == vmSymbols::executePrivileged_name())
1354 {
1355 // this frame is privileged
1356 is_privileged = true;
1357
1358 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1359
1360 StackValueCollection* locals = priv->locals();
1361 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1362 StackValue* clr_sv = locals->at(2); // Class<?> caller
1363 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1364 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1365 privileged_context = ctx_sv->get_obj();
1366 Handle caller = clr_sv->get_obj();
1367
1368 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1369 protection_domain = caller_klass->protection_domain();
1370 } else {
1371 protection_domain = method->method_holder()->protection_domain();
1372 }
1373
1374 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1375 local_array->push(Handle(thread, protection_domain));
1376 previous_protection_domain = protection_domain;
1377 }
1378
1379 if (is_privileged) break;
1380 }
1381
1382
1383 // either all the domains on the stack were system domains, or
1384 // we had a privileged system domain
1385 if (local_array->is_empty()) {
1386 if (is_privileged && privileged_context.is_null()) return NULL;
1387
1388 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1389 return JNIHandles::make_local(THREAD, result);
1390 }
1391
1392 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1393 local_array->length(), CHECK_NULL);
1394 objArrayHandle h_context(thread, context);
1395 for (int index = 0; index < local_array->length(); index++) {
1396 h_context->obj_at_put(index, local_array->at(index)());
1397 }
1398
1399 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1400
1401 return JNIHandles::make_local(THREAD, result);
1402 JVM_END
1403
1404 class ScopedValueBindingsResolver {
1405 public:
1406 InstanceKlass* Carrier_klass;
1407 ScopedValueBindingsResolver(JavaThread* THREAD) {
1408 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_incubator_concurrent_ScopedValue_Carrier(), true, THREAD);
1409 Carrier_klass = InstanceKlass::cast(k);
1410 }
1411 };
1412
1413 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1414 ResourceMark rm(THREAD);
1415 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1416 JvmtiVMObjectAllocEventCollector oam;
1417
1418 static ScopedValueBindingsResolver resolver(THREAD);
1419
1420 // Iterate through Java frames
1421 vframeStream vfst(thread);
1422 for(; !vfst.at_end(); vfst.next()) {
1423 int loc = -1;
1424 // get method of frame
1425 Method* method = vfst.method();
1426
1427 Symbol *name = method->name();
1428
1429 InstanceKlass* holder = method->method_holder();
1430 if (name == vmSymbols::runWith_method_name()) {
1431 if ((holder == resolver.Carrier_klass
1432 || holder == vmClasses::VirtualThread_klass()
1433 || holder == vmClasses::Thread_klass())) {
1434 loc = 1;
1435 }
1436 }
1437
1438 if (loc != -1) {
1439 javaVFrame *frame = vfst.asJavaVFrame();
1440 StackValueCollection* locals = frame->locals();
1441 StackValue* head_sv = locals->at(loc); // jdk/incubator/concurrent/ScopedValue$Snapshot
1442 Handle result = head_sv->get_obj();
1443 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1444 if (result() != NULL) {
1445 return JNIHandles::make_local(THREAD, result());
1446 }
1447 }
1448 }
1449
1450 return NULL;
1451 JVM_END
1452
1453 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1455 return (k != NULL) && k->is_array_klass() ? true : false;
1456 JVM_END
1457
1458
1459 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1460 oop mirror = JNIHandles::resolve_non_null(cls);
1461 return (jboolean) java_lang_Class::is_primitive(mirror);
1462 JVM_END
1463
1464
1465 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1466 oop mirror = JNIHandles::resolve_non_null(cls);
1467 if (java_lang_Class::is_primitive(mirror)) {
1468 // Primitive type
1469 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1470 }
1471
1472 Klass* k = java_lang_Class::as_Klass(mirror);
1473 debug_only(int computed_modifiers = k->compute_modifier_flags());
1474 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1475 return k->modifier_flags();
1476 JVM_END
1477
1478
1479 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1480
1481 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1482 JvmtiVMObjectAllocEventCollector oam;
1483 // ofClass is a reference to a java_lang_Class object. The mirror object
1484 // of an InstanceKlass
1485 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1486 if (java_lang_Class::is_primitive(ofMirror) ||
1487 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1488 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1489 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1490 }
1491
1492 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1493 InnerClassesIterator iter(k);
1494
1495 if (iter.length() == 0) {
1496 // Neither an inner nor outer class
1497 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1498 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1499 }
1500
1501 // find inner class info
1502 constantPoolHandle cp(thread, k->constants());
1503 int length = iter.length();
1504
1505 // Allocate temp. result array
1506 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1507 objArrayHandle result (THREAD, r);
1508 int members = 0;
1509
1510 for (; !iter.done(); iter.next()) {
1511 int ioff = iter.inner_class_info_index();
1512 int ooff = iter.outer_class_info_index();
1513
1514 if (ioff != 0 && ooff != 0) {
1515 // Check to see if the name matches the class we're looking for
1516 // before attempting to find the class.
1517 if (cp->klass_name_at_matches(k, ooff)) {
1518 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1519 if (outer_klass == k) {
1520 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1521 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1522
1523 // Throws an exception if outer klass has not declared k as
1524 // an inner klass
1525 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1526
1527 result->obj_at_put(members, inner_klass->java_mirror());
1528 members++;
1529 }
1530 }
1531 }
1532 }
1533
1534 if (members != length) {
1535 // Return array of right length
1536 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1537 for(int i = 0; i < members; i++) {
1538 res->obj_at_put(i, result->obj_at(i));
1539 }
1540 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1541 }
1542
1543 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1544 JVM_END
1545
1546
1547 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1548 {
1549 // ofClass is a reference to a java_lang_Class object.
1550 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1551 if (java_lang_Class::is_primitive(ofMirror)) {
1552 return NULL;
1553 }
1554 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1555 if (!klass->is_instance_klass()) {
1556 return NULL;
1557 }
1558
1559 bool inner_is_member = false;
1560 Klass* outer_klass
1561 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1562 if (outer_klass == NULL) return NULL; // already a top-level class
1563 if (!inner_is_member) return NULL; // a hidden class (inside a method)
1564 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1565 }
1566 JVM_END
1567
1568 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1569 {
1570 oop mirror = JNIHandles::resolve_non_null(cls);
1571 if (java_lang_Class::is_primitive(mirror)) {
1572 return NULL;
1573 }
1574 Klass* klass = java_lang_Class::as_Klass(mirror);
1575 if (!klass->is_instance_klass()) {
1576 return NULL;
1577 }
1578 InstanceKlass* k = InstanceKlass::cast(klass);
1579 int ooff = 0, noff = 0;
1580 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1581 if (noff != 0) {
1582 constantPoolHandle i_cp(thread, k->constants());
1583 Symbol* name = i_cp->symbol_at(noff);
1584 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1585 return (jstring) JNIHandles::make_local(THREAD, str());
1586 }
1587 }
1588 return NULL;
1589 }
1590 JVM_END
1591
1592 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1593 assert (cls != NULL, "illegal class");
1594 JvmtiVMObjectAllocEventCollector oam;
1595 ResourceMark rm(THREAD);
1596 oop mirror = JNIHandles::resolve_non_null(cls);
1597 // Return null for arrays and primitives
1598 if (!java_lang_Class::is_primitive(mirror)) {
1599 Klass* k = java_lang_Class::as_Klass(mirror);
1600 if (k->is_instance_klass()) {
1601 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1602 if (sym == NULL) return NULL;
1603 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1604 return (jstring) JNIHandles::make_local(THREAD, str());
1605 }
1606 }
1607 return NULL;
1608 JVM_END
1609
1610
1611 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1612 assert (cls != NULL, "illegal class");
1613 oop mirror = JNIHandles::resolve_non_null(cls);
1614 // Return null for arrays and primitives
1615 if (!java_lang_Class::is_primitive(mirror)) {
1616 Klass* k = java_lang_Class::as_Klass(mirror);
1617 if (k->is_instance_klass()) {
1618 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1619 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1620 }
1621 }
1622 return NULL;
1623 JVM_END
1624
1625
1626 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1627 // some of this code was adapted from from jni_FromReflectedField
1628
1629 oop reflected = JNIHandles::resolve_non_null(field);
1630 oop mirror = java_lang_reflect_Field::clazz(reflected);
1631 Klass* k = java_lang_Class::as_Klass(mirror);
1632 int slot = java_lang_reflect_Field::slot(reflected);
1633 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1634
1635 InstanceKlass* ik = InstanceKlass::cast(k);
1636 intptr_t offset = ik->field_offset(slot);
1637
1638 if (modifiers & JVM_ACC_STATIC) {
1639 // for static fields we only look in the current class
1640 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1641 assert(false, "cannot find static field");
1642 return false;
1643 }
1644 } else {
1645 // for instance fields we start with the current class and work
1646 // our way up through the superclass chain
1647 if (!ik->find_field_from_offset(offset, false, &fd)) {
1648 assert(false, "cannot find instance field");
1649 return false;
1650 }
1651 }
1652 return true;
1653 }
1654
1655 static Method* jvm_get_method_common(jobject method) {
1656 // some of this code was adapted from from jni_FromReflectedMethod
1657
1658 oop reflected = JNIHandles::resolve_non_null(method);
1659 oop mirror = NULL;
1660 int slot = 0;
1661
1662 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1663 mirror = java_lang_reflect_Constructor::clazz(reflected);
1664 slot = java_lang_reflect_Constructor::slot(reflected);
1665 } else {
1666 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1667 "wrong type");
1668 mirror = java_lang_reflect_Method::clazz(reflected);
1669 slot = java_lang_reflect_Method::slot(reflected);
1670 }
1671 Klass* k = java_lang_Class::as_Klass(mirror);
1672
1673 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1674 assert(m != NULL, "cannot find method");
1675 return m; // caller has to deal with NULL in product mode
1676 }
1677
1678 /* Type use annotations support (JDK 1.8) */
1679
1680 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1681 assert (cls != NULL, "illegal class");
1682 ResourceMark rm(THREAD);
1683 // Return null for arrays and primitives
1684 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1685 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1686 if (k->is_instance_klass()) {
1687 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1688 if (type_annotations != NULL) {
1689 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1690 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1691 }
1692 }
1693 }
1694 return NULL;
1695 JVM_END
1696
1697 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1698 assert (method != NULL, "illegal method");
1699 // method is a handle to a java.lang.reflect.Method object
1700 Method* m = jvm_get_method_common(method);
1701 if (m == NULL) {
1702 return NULL;
1703 }
1704
1705 AnnotationArray* type_annotations = m->type_annotations();
1706 if (type_annotations != NULL) {
1707 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1708 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1709 }
1710
1711 return NULL;
1712 JVM_END
1713
1714 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1715 assert (field != NULL, "illegal field");
1716 fieldDescriptor fd;
1717 bool gotFd = jvm_get_field_common(field, fd);
1718 if (!gotFd) {
1719 return NULL;
1720 }
1721
1722 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1723 JVM_END
1724
1725 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1726 if (!cp->is_within_bounds(index)) {
1727 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1728 }
1729 }
1730
1731 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1732 {
1733 // method is a handle to a java.lang.reflect.Method object
1734 Method* method_ptr = jvm_get_method_common(method);
1735 methodHandle mh (THREAD, method_ptr);
1736 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1737 const int num_params = mh->method_parameters_length();
1738
1739 if (num_params < 0) {
1740 // A -1 return value from method_parameters_length means there is no
1741 // parameter data. Return null to indicate this to the reflection
1742 // API.
1743 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1744 return (jobjectArray)NULL;
1745 } else {
1746 // Otherwise, we return something up to reflection, even if it is
1747 // a zero-length array. Why? Because in some cases this can
1748 // trigger a MalformedParametersException.
1749
1750 // make sure all the symbols are properly formatted
1751 for (int i = 0; i < num_params; i++) {
1752 MethodParametersElement* params = mh->method_parameters_start();
1753 int index = params[i].name_cp_index;
1754 constantPoolHandle cp(THREAD, mh->constants());
1755 bounds_check(cp, index, CHECK_NULL);
1756
1757 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1758 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1759 "Wrong type at constant pool index");
1760 }
1761
1762 }
1763
1764 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1765 objArrayHandle result (THREAD, result_oop);
1766
1767 for (int i = 0; i < num_params; i++) {
1768 MethodParametersElement* params = mh->method_parameters_start();
1769 // For a 0 index, give a NULL symbol
1770 Symbol* sym = 0 != params[i].name_cp_index ?
1771 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1772 int flags = params[i].flags;
1773 oop param = Reflection::new_parameter(reflected_method, i, sym,
1774 flags, CHECK_NULL);
1775 result->obj_at_put(i, param);
1776 }
1777 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1778 }
1779 }
1780 JVM_END
1781
1782 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1783
1784 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1785 {
1786 JvmtiVMObjectAllocEventCollector oam;
1787
1788 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1789 // Exclude primitive types and array types
1790 if (java_lang_Class::is_primitive(ofMirror) ||
1791 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1792 // Return empty array
1793 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1794 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1795 }
1796
1797 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1798 constantPoolHandle cp(THREAD, k->constants());
1799
1800 // Ensure class is linked
1801 k->link_class(CHECK_NULL);
1802
1803 // Allocate result
1804 int num_fields;
1805
1806 if (publicOnly) {
1807 num_fields = 0;
1808 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1809 if (fs.access_flags().is_public()) ++num_fields;
1810 }
1811 } else {
1812 num_fields = k->java_fields_count();
1813 }
1814
1815 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1816 objArrayHandle result (THREAD, r);
1817
1818 int out_idx = 0;
1819 fieldDescriptor fd;
1820 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1821 if (!publicOnly || fs.access_flags().is_public()) {
1822 fd.reinitialize(k, fs.index());
1823 oop field = Reflection::new_field(&fd, CHECK_NULL);
1824 result->obj_at_put(out_idx, field);
1825 ++out_idx;
1826 }
1827 }
1828 assert(out_idx == num_fields, "just checking");
1829 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1830 }
1831 JVM_END
1832
1833 // A class is a record if and only if it is final and a direct subclass of
1834 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1835 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1836 {
1837 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1838 if (k != NULL && k->is_instance_klass()) {
1839 InstanceKlass* ik = InstanceKlass::cast(k);
1840 return ik->is_record();
1841 } else {
1842 return false;
1843 }
1844 }
1845 JVM_END
1846
1847 // Returns an array containing the components of the Record attribute,
1848 // or NULL if the attribute is not present.
1849 //
1850 // Note that this function returns the components of the Record attribute
1851 // even if the class is not a record.
1852 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1853 {
1854 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1855 assert(c->is_instance_klass(), "must be");
1856 InstanceKlass* ik = InstanceKlass::cast(c);
1857
1858 Array<RecordComponent*>* components = ik->record_components();
1859 if (components != NULL) {
1860 JvmtiVMObjectAllocEventCollector oam;
1861 constantPoolHandle cp(THREAD, ik->constants());
1862 int length = components->length();
1863 assert(length >= 0, "unexpected record_components length");
1864 objArrayOop record_components =
1865 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1866 objArrayHandle components_h (THREAD, record_components);
1867
1868 for (int x = 0; x < length; x++) {
1869 RecordComponent* component = components->at(x);
1870 assert(component != NULL, "unexpected NULL record component");
1871 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1872 components_h->obj_at_put(x, component_oop);
1873 }
1874 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1875 }
1876
1877 return NULL;
1878 }
1879 JVM_END
1880
1881 static bool select_method(const methodHandle& method, bool want_constructor) {
1882 bool is_ctor = (method->is_object_constructor() ||
1883 method->is_static_vnew_factory());
1884 if (want_constructor) {
1885 return is_ctor;
1886 } else {
1887 return (!is_ctor &&
1888 !method->is_class_initializer() &&
1889 !method->is_overpass());
1890 }
1891 }
1892
1893 static jobjectArray get_class_declared_methods_helper(
1894 JNIEnv *env,
1895 jclass ofClass, jboolean publicOnly,
1896 bool want_constructor,
1897 Klass* klass, TRAPS) {
1898
1899 JvmtiVMObjectAllocEventCollector oam;
1900
1901 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1902 // Exclude primitive types and array types
1903 if (java_lang_Class::is_primitive(ofMirror)
1904 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1905 // Return empty array
1906 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1907 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1908 }
1909
1910 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1911
1912 // Ensure class is linked
1913 k->link_class(CHECK_NULL);
1914
1915 Array<Method*>* methods = k->methods();
1916 int methods_length = methods->length();
1917
1918 // Save original method_idnum in case of redefinition, which can change
1919 // the idnum of obsolete methods. The new method will have the same idnum
1920 // but if we refresh the methods array, the counts will be wrong.
1921 ResourceMark rm(THREAD);
1922 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1923 int num_methods = 0;
1924
1925 for (int i = 0; i < methods_length; i++) {
1926 methodHandle method(THREAD, methods->at(i));
1927 if (select_method(method, want_constructor)) {
1928 if (!publicOnly || method->is_public()) {
1929 idnums->push(method->method_idnum());
1930 ++num_methods;
1931 }
1932 }
1933 }
1934
1935 // Allocate result
1936 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1937 objArrayHandle result (THREAD, r);
1938
1939 // Now just put the methods that we selected above, but go by their idnum
1940 // in case of redefinition. The methods can be redefined at any safepoint,
1941 // so above when allocating the oop array and below when creating reflect
1942 // objects.
1943 for (int i = 0; i < num_methods; i++) {
1944 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1945 if (method.is_null()) {
1946 // Method may have been deleted and seems this API can handle null
1947 // Otherwise should probably put a method that throws NSME
1948 result->obj_at_put(i, NULL);
1949 } else {
1950 oop m;
1951 if (want_constructor) {
1952 assert(method->is_object_constructor() ||
1953 method->is_static_vnew_factory(), "must be");
1954 m = Reflection::new_constructor(method, CHECK_NULL);
1955 } else {
1956 m = Reflection::new_method(method, false, CHECK_NULL);
1957 }
1958 result->obj_at_put(i, m);
1959 }
1960 }
1961
1962 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1963 }
1964
1965 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1966 {
1967 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1968 /*want_constructor*/ false,
1969 vmClasses::reflect_Method_klass(), THREAD);
1970 }
1971 JVM_END
1972
1973 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1974 {
1975 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1976 /*want_constructor*/ true,
1977 vmClasses::reflect_Constructor_klass(), THREAD);
1978 }
1979 JVM_END
1980
1981 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1982 {
1983 oop mirror = JNIHandles::resolve_non_null(cls);
1984 if (java_lang_Class::is_primitive(mirror)) {
1985 // Primitive type
1986 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1987 }
1988
1989 Klass* k = java_lang_Class::as_Klass(mirror);
1990 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1991 }
1992 JVM_END
1993
1994 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1995 {
1996 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1997 assert(c->is_instance_klass(), "must be");
1998 InstanceKlass* ck = InstanceKlass::cast(c);
1999 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2000 assert(m->is_instance_klass(), "must be");
2001 InstanceKlass* mk = InstanceKlass::cast(m);
2002 return ck->has_nestmate_access_to(mk, THREAD);
2003 }
2004 JVM_END
2005
2006 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2007 {
2008 // current is not a primitive or array class
2009 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2010 assert(c->is_instance_klass(), "must be");
2011 InstanceKlass* ck = InstanceKlass::cast(c);
2012 InstanceKlass* host = ck->nest_host(THREAD);
2013 return (jclass) (host == NULL ? NULL :
2014 JNIHandles::make_local(THREAD, host->java_mirror()));
2015 }
2016 JVM_END
2017
2018 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2019 {
2020 // current is not a primitive or array class
2021 ResourceMark rm(THREAD);
2022 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2023 assert(c->is_instance_klass(), "must be");
2024 InstanceKlass* ck = InstanceKlass::cast(c);
2025 InstanceKlass* host = ck->nest_host(THREAD);
2026
2027 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2028 ck->external_name(), host->external_name());
2029 {
2030 JvmtiVMObjectAllocEventCollector oam;
2031 Array<u2>* members = host->nest_members();
2032 int length = members == NULL ? 0 : members->length();
2033
2034 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2035
2036 // nest host is first in the array so make it one bigger
2037 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2038 length + 1, CHECK_NULL);
2039 objArrayHandle result(THREAD, r);
2040 result->obj_at_put(0, host->java_mirror());
2041 if (length != 0) {
2042 int count = 0;
2043 for (int i = 0; i < length; i++) {
2044 int cp_index = members->at(i);
2045 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2046 if (HAS_PENDING_EXCEPTION) {
2047 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2048 return NULL; // propagate VMEs
2049 }
2050 if (log_is_enabled(Trace, class, nestmates)) {
2051 stringStream ss;
2052 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2053 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2054 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2055 log_trace(class, nestmates)("%s", ss.as_string());
2056 }
2057 CLEAR_PENDING_EXCEPTION;
2058 continue;
2059 }
2060 if (k->is_instance_klass()) {
2061 InstanceKlass* ik = InstanceKlass::cast(k);
2062 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2063 if (nest_host_k == host) {
2064 result->obj_at_put(count+1, k->java_mirror());
2065 count++;
2066 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2067 } else {
2068 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2069 ik->external_name(), nest_host_k->external_name());
2070 }
2071 } else {
2072 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2073 k->external_name());
2074 }
2075 }
2076 if (count < length) {
2077 // we had invalid entries so we need to compact the array
2078 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2079 length + 1, count + 1);
2080
2081 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2082 count + 1, CHECK_NULL);
2083 objArrayHandle result2(THREAD, r2);
2084 for (int i = 0; i < count + 1; i++) {
2085 result2->obj_at_put(i, result->obj_at(i));
2086 }
2087 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2088 }
2089 }
2090 else {
2091 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2092 }
2093 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2094 }
2095 }
2096 JVM_END
2097
2098 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2099 {
2100 oop mirror = JNIHandles::resolve_non_null(current);
2101 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2102 Klass* c = java_lang_Class::as_Klass(mirror);
2103 assert(c->is_instance_klass(), "must be");
2104 InstanceKlass* ik = InstanceKlass::cast(c);
2105 ResourceMark rm(THREAD);
2106 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2107 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2108 if (ik->is_sealed()) {
2109 JvmtiVMObjectAllocEventCollector oam;
2110 Array<u2>* subclasses = ik->permitted_subclasses();
2111 int length = subclasses->length();
2112
2113 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2114
2115 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2116 length, CHECK_NULL);
2117 objArrayHandle result(THREAD, r);
2118 int count = 0;
2119 for (int i = 0; i < length; i++) {
2120 int cp_index = subclasses->at(i);
2121 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2122 if (HAS_PENDING_EXCEPTION) {
2123 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2124 return NULL; // propagate VMEs
2125 }
2126 if (log_is_enabled(Trace, class, sealed)) {
2127 stringStream ss;
2128 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2129 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2130 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2131 log_trace(class, sealed)("%s", ss.as_string());
2132 }
2133
2134 CLEAR_PENDING_EXCEPTION;
2135 continue;
2136 }
2137 if (k->is_instance_klass()) {
2138 result->obj_at_put(count++, k->java_mirror());
2139 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2140 }
2141 }
2142 if (count < length) {
2143 // we had invalid entries so we need to compact the array
2144 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2145 count, CHECK_NULL);
2146 objArrayHandle result2(THREAD, r2);
2147 for (int i = 0; i < count; i++) {
2148 result2->obj_at_put(i, result->obj_at(i));
2149 }
2150 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2151 }
2152 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2153 } else {
2154 return NULL;
2155 }
2156 }
2157 JVM_END
2158
2159 // Constant pool access //////////////////////////////////////////////////////////
2160
2161 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2162 {
2163 JvmtiVMObjectAllocEventCollector oam;
2164 oop mirror = JNIHandles::resolve_non_null(cls);
2165 // Return null for primitives and arrays
2166 if (!java_lang_Class::is_primitive(mirror)) {
2167 Klass* k = java_lang_Class::as_Klass(mirror);
2168 if (k->is_instance_klass()) {
2169 InstanceKlass* k_h = InstanceKlass::cast(k);
2170 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2171 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2172 return JNIHandles::make_local(THREAD, jcp());
2173 }
2174 }
2175 return NULL;
2176 }
2177 JVM_END
2178
2179
2180 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2181 {
2182 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2183 return cp->length();
2184 }
2185 JVM_END
2186
2187
2188 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2189 {
2190 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2191 bounds_check(cp, index, CHECK_NULL);
2192 constantTag tag = cp->tag_at(index);
2193 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2194 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2195 }
2196 Klass* k = cp->klass_at(index, CHECK_NULL);
2197 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2198 }
2199 JVM_END
2200
2201 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2202 {
2203 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2204 bounds_check(cp, index, CHECK_NULL);
2205 constantTag tag = cp->tag_at(index);
2206 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2207 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2208 }
2209 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2210 if (k == NULL) return NULL;
2211 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2212 }
2213 JVM_END
2214
2215 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2216 constantTag tag = cp->tag_at(index);
2217 if (!tag.is_method() && !tag.is_interface_method()) {
2218 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2219 }
2220 int klass_ref = cp->uncached_klass_ref_index_at(index);
2221 Klass* k_o;
2222 if (force_resolution) {
2223 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2224 } else {
2225 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2226 if (k_o == NULL) return NULL;
2227 }
2228 InstanceKlass* k = InstanceKlass::cast(k_o);
2229 Symbol* name = cp->uncached_name_ref_at(index);
2230 Symbol* sig = cp->uncached_signature_ref_at(index);
2231 methodHandle m (THREAD, k->find_method(name, sig));
2232 if (m.is_null()) {
2233 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2234 }
2235 oop method;
2236 if (m->is_object_constructor() || m->is_static_vnew_factory()) {
2237 method = Reflection::new_constructor(m, CHECK_NULL);
2238 } else {
2239 method = Reflection::new_method(m, true, CHECK_NULL);
2240 }
2241 return JNIHandles::make_local(THREAD, method);
2242 }
2243
2244 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2245 {
2246 JvmtiVMObjectAllocEventCollector oam;
2247 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2248 bounds_check(cp, index, CHECK_NULL);
2249 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2250 return res;
2251 }
2252 JVM_END
2253
2254 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2255 {
2256 JvmtiVMObjectAllocEventCollector oam;
2257 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2258 bounds_check(cp, index, CHECK_NULL);
2259 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2260 return res;
2261 }
2262 JVM_END
2263
2264 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2265 constantTag tag = cp->tag_at(index);
2266 if (!tag.is_field()) {
2267 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2268 }
2269 int klass_ref = cp->uncached_klass_ref_index_at(index);
2270 Klass* k_o;
2271 if (force_resolution) {
2272 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2273 } else {
2274 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2275 if (k_o == NULL) return NULL;
2276 }
2277 InstanceKlass* k = InstanceKlass::cast(k_o);
2278 Symbol* name = cp->uncached_name_ref_at(index);
2279 Symbol* sig = cp->uncached_signature_ref_at(index);
2280 fieldDescriptor fd;
2281 Klass* target_klass = k->find_field(name, sig, &fd);
2282 if (target_klass == NULL) {
2283 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2284 }
2285 oop field = Reflection::new_field(&fd, CHECK_NULL);
2286 return JNIHandles::make_local(THREAD, field);
2287 }
2288
2289 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2290 {
2291 JvmtiVMObjectAllocEventCollector oam;
2292 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2293 bounds_check(cp, index, CHECK_NULL);
2294 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2295 return res;
2296 }
2297 JVM_END
2298
2299 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2300 {
2301 JvmtiVMObjectAllocEventCollector oam;
2302 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2303 bounds_check(cp, index, CHECK_NULL);
2304 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2305 return res;
2306 }
2307 JVM_END
2308
2309 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2310 {
2311 JvmtiVMObjectAllocEventCollector oam;
2312 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2313 bounds_check(cp, index, CHECK_NULL);
2314 constantTag tag = cp->tag_at(index);
2315 if (!tag.is_field_or_method()) {
2316 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2317 }
2318 int klass_ref = cp->uncached_klass_ref_index_at(index);
2319 Symbol* klass_name = cp->klass_name_at(klass_ref);
2320 Symbol* member_name = cp->uncached_name_ref_at(index);
2321 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2322 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2323 objArrayHandle dest(THREAD, dest_o);
2324 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2325 dest->obj_at_put(0, str());
2326 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2327 dest->obj_at_put(1, str());
2328 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2329 dest->obj_at_put(2, str());
2330 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2331 }
2332 JVM_END
2333
2334 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2335 {
2336 JvmtiVMObjectAllocEventCollector oam;
2337 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2338 bounds_check(cp, index, CHECK_0);
2339 constantTag tag = cp->tag_at(index);
2340 if (!tag.is_field_or_method()) {
2341 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2342 }
2343 return (jint) cp->uncached_klass_ref_index_at(index);
2344 }
2345 JVM_END
2346
2347 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2348 {
2349 JvmtiVMObjectAllocEventCollector oam;
2350 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2351 bounds_check(cp, index, CHECK_0);
2352 constantTag tag = cp->tag_at(index);
2353 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2354 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2355 }
2356 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2357 }
2358 JVM_END
2359
2360 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2361 {
2362 JvmtiVMObjectAllocEventCollector oam;
2363 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2364 bounds_check(cp, index, CHECK_NULL);
2365 constantTag tag = cp->tag_at(index);
2366 if (!tag.is_name_and_type()) {
2367 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2368 }
2369 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2370 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2371 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2372 objArrayHandle dest(THREAD, dest_o);
2373 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2374 dest->obj_at_put(0, str());
2375 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2376 dest->obj_at_put(1, str());
2377 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2378 }
2379 JVM_END
2380
2381 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2382 {
2383 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2384 bounds_check(cp, index, CHECK_0);
2385 constantTag tag = cp->tag_at(index);
2386 if (!tag.is_int()) {
2387 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2388 }
2389 return cp->int_at(index);
2390 }
2391 JVM_END
2392
2393 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2394 {
2395 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2396 bounds_check(cp, index, CHECK_(0L));
2397 constantTag tag = cp->tag_at(index);
2398 if (!tag.is_long()) {
2399 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2400 }
2401 return cp->long_at(index);
2402 }
2403 JVM_END
2404
2405 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2406 {
2407 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2408 bounds_check(cp, index, CHECK_(0.0f));
2409 constantTag tag = cp->tag_at(index);
2410 if (!tag.is_float()) {
2411 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2412 }
2413 return cp->float_at(index);
2414 }
2415 JVM_END
2416
2417 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2418 {
2419 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2420 bounds_check(cp, index, CHECK_(0.0));
2421 constantTag tag = cp->tag_at(index);
2422 if (!tag.is_double()) {
2423 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2424 }
2425 return cp->double_at(index);
2426 }
2427 JVM_END
2428
2429 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2430 {
2431 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2432 bounds_check(cp, index, CHECK_NULL);
2433 constantTag tag = cp->tag_at(index);
2434 if (!tag.is_string()) {
2435 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2436 }
2437 oop str = cp->string_at(index, CHECK_NULL);
2438 return (jstring) JNIHandles::make_local(THREAD, str);
2439 }
2440 JVM_END
2441
2442 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2443 {
2444 JvmtiVMObjectAllocEventCollector oam;
2445 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2446 bounds_check(cp, index, CHECK_NULL);
2447 constantTag tag = cp->tag_at(index);
2448 if (!tag.is_symbol()) {
2449 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2450 }
2451 Symbol* sym = cp->symbol_at(index);
2452 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2453 return (jstring) JNIHandles::make_local(THREAD, str());
2454 }
2455 JVM_END
2456
2457 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2458 {
2459 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2460 bounds_check(cp, index, CHECK_0);
2461 constantTag tag = cp->tag_at(index);
2462 jbyte result = tag.value();
2463 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2464 // they are changed to the corresponding tags from the JVM spec, so that java code in
2465 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2466 if (tag.is_klass_or_reference()) {
2467 result = JVM_CONSTANT_Class;
2468 } else if (tag.is_string_index()) {
2469 result = JVM_CONSTANT_String;
2470 } else if (tag.is_method_type_in_error()) {
2471 result = JVM_CONSTANT_MethodType;
2472 } else if (tag.is_method_handle_in_error()) {
2473 result = JVM_CONSTANT_MethodHandle;
2474 } else if (tag.is_dynamic_constant_in_error()) {
2475 result = JVM_CONSTANT_Dynamic;
2476 }
2477 return result;
2478 }
2479 JVM_END
2480
2481 // Assertion support. //////////////////////////////////////////////////////////
2482
2483 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2484 assert(cls != NULL, "bad class");
2485
2486 oop r = JNIHandles::resolve(cls);
2487 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2488 if (java_lang_Class::is_primitive(r)) return false;
2489
2490 Klass* k = java_lang_Class::as_Klass(r);
2491 assert(k->is_instance_klass(), "must be an instance klass");
2492 if (!k->is_instance_klass()) return false;
2493
2494 ResourceMark rm(THREAD);
2495 const char* name = k->name()->as_C_string();
2496 bool system_class = k->class_loader() == NULL;
2497 return JavaAssertions::enabled(name, system_class);
2498
2499 JVM_END
2500
2501
2502 // Return a new AssertionStatusDirectives object with the fields filled in with
2503 // command-line assertion arguments (i.e., -ea, -da).
2504 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2505 JvmtiVMObjectAllocEventCollector oam;
2506 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2507 return JNIHandles::make_local(THREAD, asd);
2508 JVM_END
2509
2510 // Arrays support /////////////////////////////////////////////////////////////
2511
2512 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2513 oop o = JNIHandles::resolve(array);
2514 Klass* k = o->klass();
2515 if ((o == NULL) || (!k->is_array_klass())) {
2516 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2517 }
2518 return ArrayKlass::cast(k)->element_access_is_atomic();
2519 JVM_END
2520
2521 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2522 oop o = JNIHandles::resolve(array);
2523 Klass* k = o->klass();
2524 if ((o == NULL) || (!k->is_array_klass())) {
2525 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2526 }
2527 if (k->is_flatArray_klass()) {
2528 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2529 if (!vk->element_access_is_atomic()) {
2530 /**
2531 * Need to decide how to implement:
2532 *
2533 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2534 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2535 * "checkcast" & "instanceof"
2536 *
2537 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2538 * possibly per instance lock structure. Said info, could be placed in
2539 * "trailer" rather than disturb the current arrayOop
2540 */
2541 Unimplemented();
2542 }
2543 }
2544 return array;
2545 JVM_END
2546
2547 // Verification ////////////////////////////////////////////////////////////////////////////////
2548
2549 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2550
2551 // RedefineClasses support: bug 6214132 caused verification to fail.
2552 // All functions from this section should call the jvmtiThreadSate function:
2553 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2554 // The function returns a Klass* of the _scratch_class if the verifier
2555 // was invoked in the middle of the class redefinition.
2556 // Otherwise it returns its argument value which is the _the_class Klass*.
2557 // Please, refer to the description in the jvmtiThreadSate.hpp.
2558
2559 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562 return k->name()->as_utf8();
2563 JVM_END
2564
2565
2566 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2568 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2569 // types will have length zero if this is not an InstanceKlass
2570 // (length is determined by call to JVM_GetClassCPEntriesCount)
2571 if (k->is_instance_klass()) {
2572 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2573 for (int index = cp->length() - 1; index >= 0; index--) {
2574 constantTag tag = cp->tag_at(index);
2575 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2576 }
2577 }
2578 JVM_END
2579
2580
2581 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2583 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2584 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2585 JVM_END
2586
2587
2588 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2590 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2591 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2592 JVM_END
2593
2594
2595 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2596 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2597 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2598 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2599 JVM_END
2600
2601
2602 // The following methods, used for the verifier, are never called with
2603 // array klasses, so a direct cast to InstanceKlass is safe.
2604 // Typically, these methods are called in a loop with bounds determined
2605 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2606 // zero for arrays.
2607 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2608 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2609 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2610 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2611 int length = method->checked_exceptions_length();
2612 if (length > 0) {
2613 CheckedExceptionElement* table= method->checked_exceptions_start();
2614 for (int i = 0; i < length; i++) {
2615 exceptions[i] = table[i].class_cp_index;
2616 }
2617 }
2618 JVM_END
2619
2620
2621 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2622 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2623 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2624 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2625 return method->checked_exceptions_length();
2626 JVM_END
2627
2628
2629 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2631 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2632 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2633 memcpy(code, method->code_base(), method->code_size());
2634 JVM_END
2635
2636
2637 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2638 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2640 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2641 return method->code_size();
2642 JVM_END
2643
2644
2645 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2647 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2648 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2649 ExceptionTable extable(method);
2650 entry->start_pc = extable.start_pc(entry_index);
2651 entry->end_pc = extable.end_pc(entry_index);
2652 entry->handler_pc = extable.handler_pc(entry_index);
2653 entry->catchType = extable.catch_type_index(entry_index);
2654 JVM_END
2655
2656
2657 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2659 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2660 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2661 return method->exception_table_length();
2662 JVM_END
2663
2664
2665 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2668 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2669 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2670 JVM_END
2671
2672
2673 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2676 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2677 JVM_END
2678
2679
2680 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2681 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2682 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2683 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2684 return method->max_locals();
2685 JVM_END
2686
2687
2688 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2689 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2690 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2691 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2692 return method->size_of_parameters();
2693 JVM_END
2694
2695
2696 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2699 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2700 return method->verifier_max_stack();
2701 JVM_END
2702
2703
2704 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2705 ResourceMark rm(THREAD);
2706 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2707 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2708 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2709 return method->is_object_constructor();
2710 JVM_END
2711
2712
2713 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2714 ResourceMark rm(THREAD);
2715 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2716 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2717 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2718 return method->is_overpass();
2719 JVM_END
2720
2721 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2722 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2723 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2724 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2725 return method->name()->as_utf8();
2726 JVM_END
2727
2728
2729 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2730 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2731 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2732 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2733 return method->signature()->as_utf8();
2734 JVM_END
2735
2736 /**
2737 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2738 * read entries in the constant pool. Since the old verifier always
2739 * works on a copy of the code, it will not see any rewriting that
2740 * may possibly occur in the middle of verification. So it is important
2741 * that nothing it calls tries to use the cpCache instead of the raw
2742 * constant pool, so we must use cp->uncached_x methods when appropriate.
2743 */
2744 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2745 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2746 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2747 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2748 switch (cp->tag_at(cp_index).value()) {
2749 case JVM_CONSTANT_Fieldref:
2750 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2751 default:
2752 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2753 }
2754 ShouldNotReachHere();
2755 return NULL;
2756 JVM_END
2757
2758
2759 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2760 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2761 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2762 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2763 switch (cp->tag_at(cp_index).value()) {
2764 case JVM_CONSTANT_InterfaceMethodref:
2765 case JVM_CONSTANT_Methodref:
2766 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2767 default:
2768 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2769 }
2770 ShouldNotReachHere();
2771 return NULL;
2772 JVM_END
2773
2774
2775 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2776 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2777 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2778 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2779 switch (cp->tag_at(cp_index).value()) {
2780 case JVM_CONSTANT_InterfaceMethodref:
2781 case JVM_CONSTANT_Methodref:
2782 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2783 default:
2784 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2785 }
2786 ShouldNotReachHere();
2787 return NULL;
2788 JVM_END
2789
2790
2791 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2792 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2793 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2794 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2795 switch (cp->tag_at(cp_index).value()) {
2796 case JVM_CONSTANT_Fieldref:
2797 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2798 default:
2799 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2800 }
2801 ShouldNotReachHere();
2802 return NULL;
2803 JVM_END
2804
2805
2806 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2807 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2808 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2809 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2810 Symbol* classname = cp->klass_name_at(cp_index);
2811 return classname->as_utf8();
2812 JVM_END
2813
2814
2815 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2816 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2817 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2818 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2819 switch (cp->tag_at(cp_index).value()) {
2820 case JVM_CONSTANT_Fieldref: {
2821 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2822 Symbol* classname = cp->klass_name_at(class_index);
2823 return classname->as_utf8();
2824 }
2825 default:
2826 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2827 }
2828 ShouldNotReachHere();
2829 return NULL;
2830 JVM_END
2831
2832
2833 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2834 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2835 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2836 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2837 switch (cp->tag_at(cp_index).value()) {
2838 case JVM_CONSTANT_Methodref:
2839 case JVM_CONSTANT_InterfaceMethodref: {
2840 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2841 Symbol* classname = cp->klass_name_at(class_index);
2842 return classname->as_utf8();
2843 }
2844 default:
2845 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2846 }
2847 ShouldNotReachHere();
2848 return NULL;
2849 JVM_END
2850
2851
2852 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2853 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2854 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2855 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2856 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2857 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2858 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2859 switch (cp->tag_at(cp_index).value()) {
2860 case JVM_CONSTANT_Fieldref: {
2861 Symbol* name = cp->uncached_name_ref_at(cp_index);
2862 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2863 InstanceKlass* ik = InstanceKlass::cast(k_called);
2864 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2865 if (fs.name() == name && fs.signature() == signature) {
2866 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2867 }
2868 }
2869 return -1;
2870 }
2871 default:
2872 fatal("JVM_GetCPFieldModifiers: illegal constant");
2873 }
2874 ShouldNotReachHere();
2875 return 0;
2876 JVM_END
2877
2878
2879 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2880 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2881 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2882 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2883 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2884 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2885 switch (cp->tag_at(cp_index).value()) {
2886 case JVM_CONSTANT_Methodref:
2887 case JVM_CONSTANT_InterfaceMethodref: {
2888 Symbol* name = cp->uncached_name_ref_at(cp_index);
2889 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2890 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2891 int methods_count = methods->length();
2892 for (int i = 0; i < methods_count; i++) {
2893 Method* method = methods->at(i);
2894 if (method->name() == name && method->signature() == signature) {
2895 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2896 }
2897 }
2898 return -1;
2899 }
2900 default:
2901 fatal("JVM_GetCPMethodModifiers: illegal constant");
2902 }
2903 ShouldNotReachHere();
2904 return 0;
2905 JVM_END
2906
2907
2908 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2909
2910 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2911 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2912 JVM_END
2913
2914
2915 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2916 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2917 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2918 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2919 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2920 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2921 JVM_END
2922
2923 // Printing support //////////////////////////////////////////////////
2924 extern "C" {
2925
2926 ATTRIBUTE_PRINTF(3, 0)
2927 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2928 // Reject count values that are negative signed values converted to
2929 // unsigned; see bug 4399518, 4417214
2930 if ((intptr_t)count <= 0) return -1;
2931
2932 int result = os::vsnprintf(str, count, fmt, args);
2933 if (result > 0 && (size_t)result >= count) {
2934 result = -1;
2935 }
2936
2937 return result;
2938 }
2939
2940 ATTRIBUTE_PRINTF(3, 4)
2941 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2942 va_list args;
2943 int len;
2944 va_start(args, fmt);
2945 len = jio_vsnprintf(str, count, fmt, args);
2946 va_end(args);
2947 return len;
2948 }
2949
2950 ATTRIBUTE_PRINTF(2, 3)
2951 int jio_fprintf(FILE* f, const char *fmt, ...) {
2952 int len;
2953 va_list args;
2954 va_start(args, fmt);
2955 len = jio_vfprintf(f, fmt, args);
2956 va_end(args);
2957 return len;
2958 }
2959
2960 ATTRIBUTE_PRINTF(2, 0)
2961 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2962 if (Arguments::vfprintf_hook() != NULL) {
2963 return Arguments::vfprintf_hook()(f, fmt, args);
2964 } else {
2965 return vfprintf(f, fmt, args);
2966 }
2967 }
2968
2969 ATTRIBUTE_PRINTF(1, 2)
2970 JNIEXPORT int jio_printf(const char *fmt, ...) {
2971 int len;
2972 va_list args;
2973 va_start(args, fmt);
2974 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2975 va_end(args);
2976 return len;
2977 }
2978
2979 // HotSpot specific jio method
2980 void jio_print(const char* s, size_t len) {
2981 // Try to make this function as atomic as possible.
2982 if (Arguments::vfprintf_hook() != NULL) {
2983 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2984 } else {
2985 // Make an unused local variable to avoid warning from gcc compiler.
2986 ssize_t count = os::write(defaultStream::output_fd(), s, (int)len);
2987 }
2988 }
2989
2990 } // Extern C
2991
2992 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2993
2994 // In most of the JVM thread support functions we need to access the
2995 // thread through a ThreadsListHandle to prevent it from exiting and
2996 // being reclaimed while we try to operate on it. The exceptions to this
2997 // rule are when operating on the current thread, or if the monitor of
2998 // the target java.lang.Thread is locked at the Java level - in both
2999 // cases the target cannot exit.
3000
3001 static void thread_entry(JavaThread* thread, TRAPS) {
3002 HandleMark hm(THREAD);
3003 Handle obj(THREAD, thread->threadObj());
3004 JavaValue result(T_VOID);
3005 JavaCalls::call_virtual(&result,
3006 obj,
3007 vmClasses::Thread_klass(),
3008 vmSymbols::run_method_name(),
3009 vmSymbols::void_method_signature(),
3010 THREAD);
3011 }
3012
3013
3014 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3015 #if INCLUDE_CDS
3016 if (DumpSharedSpaces) {
3017 // During java -Xshare:dump, if we allow multiple Java threads to
3018 // execute in parallel, symbols and classes may be loaded in
3019 // random orders which will make the resulting CDS archive
3020 // non-deterministic.
3021 //
3022 // Lucikly, during java -Xshare:dump, it's important to run only
3023 // the code in the main Java thread (which is NOT started here) that
3024 // creates the module graph, etc. It's safe to not start the other
3025 // threads which are launched by class static initializers
3026 // (ReferenceHandler, FinalizerThread and CleanerImpl).
3027 if (log_is_enabled(Info, cds)) {
3028 ResourceMark rm;
3029 oop t = JNIHandles::resolve_non_null(jthread);
3030 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
3031 }
3032 return;
3033 }
3034 #endif
3035 JavaThread *native_thread = NULL;
3036
3037 // We cannot hold the Threads_lock when we throw an exception,
3038 // due to rank ordering issues. Example: we might need to grab the
3039 // Heap_lock while we construct the exception.
3040 bool throw_illegal_thread_state = false;
3041
3042 // We must release the Threads_lock before we can post a jvmti event
3043 // in Thread::start.
3044 {
3045 // Ensure that the C++ Thread and OSThread structures aren't freed before
3046 // we operate.
3047 MutexLocker mu(Threads_lock);
3048
3049 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3050 // re-starting an already started thread, so we should usually find
3051 // that the JavaThread is null. However for a JNI attached thread
3052 // there is a small window between the Thread object being created
3053 // (with its JavaThread set) and the update to its threadStatus, so we
3054 // have to check for this
3055 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3056 throw_illegal_thread_state = true;
3057 } else {
3058 jlong size =
3059 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3060 // Allocate the C++ Thread structure and create the native thread. The
3061 // stack size retrieved from java is 64-bit signed, but the constructor takes
3062 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3063 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3064 // - Avoid passing negative values which would result in really large stacks.
3065 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3066 size_t sz = size > 0 ? (size_t) size : 0;
3067 native_thread = new JavaThread(&thread_entry, sz);
3068
3069 // At this point it may be possible that no osthread was created for the
3070 // JavaThread due to lack of memory. Check for this situation and throw
3071 // an exception if necessary. Eventually we may want to change this so
3072 // that we only grab the lock if the thread was created successfully -
3073 // then we can also do this check and throw the exception in the
3074 // JavaThread constructor.
3075 if (native_thread->osthread() != NULL) {
3076 // Note: the current thread is not being used within "prepare".
3077 native_thread->prepare(jthread);
3078 }
3079 }
3080 }
3081
3082 if (throw_illegal_thread_state) {
3083 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3084 }
3085
3086 assert(native_thread != NULL, "Starting null thread?");
3087
3088 if (native_thread->osthread() == NULL) {
3089 ResourceMark rm(thread);
3090 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3091 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3092 // No one should hold a reference to the 'native_thread'.
3093 native_thread->smr_delete();
3094 if (JvmtiExport::should_post_resource_exhausted()) {
3095 JvmtiExport::post_resource_exhausted(
3096 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3097 os::native_thread_creation_failed_msg());
3098 }
3099 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3100 os::native_thread_creation_failed_msg());
3101 }
3102
3103 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3104
3105 Thread::start(native_thread);
3106
3107 JVM_END
3108
3109
3110 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3111 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3112 return java_lang_Thread::is_alive(thread_oop);
3113 JVM_END
3114
3115
3116 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3117 ThreadsListHandle tlh(thread);
3118 oop java_thread = NULL;
3119 JavaThread* receiver = NULL;
3120 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3121 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3122
3123 if (is_alive) {
3124 // jthread refers to a live JavaThread.
3125 Thread::set_priority(receiver, (ThreadPriority)prio);
3126 }
3127 // Implied else: If the JavaThread hasn't started yet, then the
3128 // priority set in the java.lang.Thread object above will be pushed
3129 // down when it does start.
3130 JVM_END
3131
3132
3133 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3134 if (os::dont_yield()) return;
3135 HOTSPOT_THREAD_YIELD();
3136 os::naked_yield();
3137 JVM_END
3138
3139 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3140 if (millis < 0) {
3141 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3142 }
3143
3144 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3145 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3146 }
3147
3148 // Save current thread state and restore it at the end of this block.
3149 // And set new thread state to SLEEPING.
3150 JavaThreadSleepState jtss(thread);
3151
3152 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3153
3154 if (millis == 0) {
3155 os::naked_yield();
3156 } else {
3157 ThreadState old_state = thread->osthread()->get_state();
3158 thread->osthread()->set_state(SLEEPING);
3159 if (!thread->sleep(millis)) { // interrupted
3160 // An asynchronous exception could have been thrown on
3161 // us while we were sleeping. We do not overwrite those.
3162 if (!HAS_PENDING_EXCEPTION) {
3163 HOTSPOT_THREAD_SLEEP_END(1);
3164
3165 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3166 // to properly restore the thread state. That's likely wrong.
3167 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3168 }
3169 }
3170 thread->osthread()->set_state(old_state);
3171 }
3172 HOTSPOT_THREAD_SLEEP_END(0);
3173 JVM_END
3174
3175 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3176 oop jthread = thread->threadObj();
3177 assert(jthread != NULL, "no current carrier thread!");
3178 return JNIHandles::make_local(THREAD, jthread);
3179 JVM_END
3180
3181 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3182 oop theThread = thread->vthread();
3183 assert(theThread != (oop)NULL, "no current thread!");
3184 return JNIHandles::make_local(THREAD, theThread);
3185 JVM_END
3186
3187 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3188 jobject theThread))
3189 oop threadObj = JNIHandles::resolve(theThread);
3190 thread->set_vthread(threadObj);
3191 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3192 JVM_END
3193
3194 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3195 return ThreadIdentifier::unsafe_offset();
3196 JVM_END
3197
3198 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3199 ThreadsListHandle tlh(thread);
3200 JavaThread* receiver = NULL;
3201 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3202 if (is_alive) {
3203 // jthread refers to a live JavaThread.
3204 receiver->interrupt();
3205 }
3206 JVM_END
3207
3208 // Return true iff the current thread has locked the object passed in
3209
3210 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3211 if (obj == NULL) {
3212 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3213 }
3214 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3215 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3216 JVM_END
3217
3218 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3219 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3220 return JNIHandles::make_local(THREAD, trace);
3221 JVM_END
3222
3223 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3224 VM_PrintThreads op;
3225 VMThread::execute(&op);
3226 if (JvmtiExport::should_post_data_dump()) {
3227 JvmtiExport::post_data_dump();
3228 }
3229 JVM_END
3230
3231 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3232 // We don't use a ThreadsListHandle here because the current thread
3233 // must be alive.
3234 oop java_thread = JNIHandles::resolve_non_null(jthread);
3235 JavaThread* thr = java_lang_Thread::thread(java_thread);
3236 if (thread == thr && !thr->has_attached_via_jni()) {
3237 // Thread naming is only supported for the current thread and
3238 // we don't set the name of an attached thread to avoid stepping
3239 // on other programs.
3240 ResourceMark rm(thread);
3241 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3242 os::set_native_thread_name(thread_name);
3243 }
3244 JVM_END
3245
3246 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3247 oop theCache = thread->scopedValueCache();
3248 return JNIHandles::make_local(THREAD, theCache);
3249 JVM_END
3250
3251 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3252 jobject theCache))
3253 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3254 thread->set_scopedValueCache(objs);
3255 JVM_END
3256
3257 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3258
3259 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3260 ResourceMark rm(THREAD);
3261 JvmtiVMObjectAllocEventCollector oam;
3262 vframeStream vfst(thread);
3263
3264 if (vmClasses::reflect_CallerSensitive_klass() != NULL) {
3265 // This must only be called from SecurityManager.getClassContext
3266 Method* m = vfst.method();
3267 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3268 m->name() == vmSymbols::getClassContext_name() &&
3269 m->signature() == vmSymbols::void_class_array_signature())) {
3270 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3271 }
3272 }
3273
3274 // Collect method holders
3275 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3276 for (; !vfst.at_end(); vfst.security_next()) {
3277 Method* m = vfst.method();
3278 // Native frames are not returned
3279 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3280 Klass* holder = m->method_holder();
3281 assert(holder->is_klass(), "just checking");
3282 klass_array->append(holder);
3283 }
3284 }
3285
3286 // Create result array of type [Ljava/lang/Class;
3287 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3288 // Fill in mirrors corresponding to method holders
3289 for (int i = 0; i < klass_array->length(); i++) {
3290 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3291 }
3292
3293 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3294 JVM_END
3295
3296
3297 // java.lang.Package ////////////////////////////////////////////////////////////////
3298
3299
3300 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3301 ResourceMark rm(THREAD);
3302 JvmtiVMObjectAllocEventCollector oam;
3303 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3304 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3305 return (jstring) JNIHandles::make_local(THREAD, result);
3306 JVM_END
3307
3308
3309 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3310 JvmtiVMObjectAllocEventCollector oam;
3311 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3312 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3313 JVM_END
3314
3315
3316 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3317
3318
3319 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3320 MonitorLocker ml(Heap_lock);
3321 oop ref = Universe::reference_pending_list();
3322 if (ref != NULL) {
3323 Universe::clear_reference_pending_list();
3324 }
3325 return JNIHandles::make_local(THREAD, ref);
3326 JVM_END
3327
3328 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3329 MonitorLocker ml(Heap_lock);
3330 return Universe::has_reference_pending_list();
3331 JVM_END
3332
3333 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3334 MonitorLocker ml(Heap_lock);
3335 while (!Universe::has_reference_pending_list()) {
3336 ml.wait();
3337 }
3338 JVM_END
3339
3340 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3341 oop ref_oop = JNIHandles::resolve_non_null(ref);
3342 // PhantomReference has it's own implementation of refersTo().
3343 // See: JVM_PhantomReferenceRefersTo
3344 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3345 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3346 return referent == JNIHandles::resolve(o);
3347 JVM_END
3348
3349 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3350 oop ref_oop = JNIHandles::resolve_non_null(ref);
3351 // FinalReference has it's own implementation of clear().
3352 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3353 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == NULL) {
3354 // If the referent has already been cleared then done.
3355 // However, if the referent is dead but has not yet been cleared by
3356 // concurrent reference processing, it should NOT be cleared here.
3357 // Instead, clearing should be left to the GC. Clearing it here could
3358 // detectably lose an expected notification, which is impossible with
3359 // STW reference processing. The clearing in enqueue() doesn't have
3360 // this problem, since the enqueue covers the notification, but it's not
3361 // worth the effort to handle that case specially.
3362 return;
3363 }
3364 java_lang_ref_Reference::clear_referent(ref_oop);
3365 JVM_END
3366
3367
3368 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3369
3370
3371 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3372 oop ref_oop = JNIHandles::resolve_non_null(ref);
3373 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3374 return referent == JNIHandles::resolve(o);
3375 JVM_END
3376
3377
3378 // ObjectInputStream ///////////////////////////////////////////////////////////////
3379
3380 // Return the first user-defined class loader up the execution stack, or null
3381 // if only code from the bootstrap or platform class loader is on the stack.
3382
3383 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3384 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3385 InstanceKlass* ik = vfst.method()->method_holder();
3386 oop loader = ik->class_loader();
3387 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3388 // Skip reflection related frames
3389 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3390 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3391 return JNIHandles::make_local(THREAD, loader);
3392 }
3393 }
3394 }
3395 return NULL;
3396 JVM_END
3397
3398
3399 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3400
3401
3402 // resolve array handle and check arguments
3403 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3404 if (arr == NULL) {
3405 THROW_0(vmSymbols::java_lang_NullPointerException());
3406 }
3407 oop a = JNIHandles::resolve_non_null(arr);
3408 if (!a->is_array()) {
3409 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3410 } else if (type_array_only && !a->is_typeArray()) {
3411 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3412 }
3413 return arrayOop(a);
3414 }
3415
3416
3417 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3418 arrayOop a = check_array(env, arr, false, CHECK_0);
3419 return a->length();
3420 JVM_END
3421
3422
3423 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3424 JvmtiVMObjectAllocEventCollector oam;
3425 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3426 jvalue value;
3427 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3428 oop box = Reflection::box(&value, type, CHECK_NULL);
3429 return JNIHandles::make_local(THREAD, box);
3430 JVM_END
3431
3432
3433 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3434 jvalue value;
3435 value.i = 0; // to initialize value before getting used in CHECK
3436 arrayOop a = check_array(env, arr, true, CHECK_(value));
3437 assert(a->is_typeArray(), "just checking");
3438 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3439 BasicType wide_type = (BasicType) wCode;
3440 if (type != wide_type) {
3441 Reflection::widen(&value, type, wide_type, CHECK_(value));
3442 }
3443 return value;
3444 JVM_END
3445
3446
3447 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3448 arrayOop a = check_array(env, arr, false, CHECK);
3449 oop box = JNIHandles::resolve(val);
3450 jvalue value;
3451 value.i = 0; // to initialize value before getting used in CHECK
3452 BasicType value_type;
3453 if (a->is_objArray()) {
3454 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3455 value_type = Reflection::unbox_for_regular_object(box, &value);
3456 } else {
3457 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3458 }
3459 Reflection::array_set(&value, a, index, value_type, CHECK);
3460 JVM_END
3461
3462
3463 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3464 arrayOop a = check_array(env, arr, true, CHECK);
3465 assert(a->is_typeArray(), "just checking");
3466 BasicType value_type = (BasicType) vCode;
3467 Reflection::array_set(&v, a, index, value_type, CHECK);
3468 JVM_END
3469
3470
3471 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3472 JvmtiVMObjectAllocEventCollector oam;
3473 oop element_mirror = JNIHandles::resolve(eltClass);
3474 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3475 return JNIHandles::make_local(THREAD, result);
3476 JVM_END
3477
3478
3479 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3480 JvmtiVMObjectAllocEventCollector oam;
3481 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3482 oop element_mirror = JNIHandles::resolve(eltClass);
3483 assert(dim_array->is_typeArray(), "just checking");
3484 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3485 return JNIHandles::make_local(THREAD, result);
3486 JVM_END
3487
3488
3489 // Library support ///////////////////////////////////////////////////////////////////////////
3490
3491 JVM_LEAF(void*, JVM_LoadZipLibrary())
3492 ClassLoader::load_zip_library_if_needed();
3493 return ClassLoader::zip_library_handle();
3494 JVM_END
3495
3496 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3497 //%note jvm_ct
3498 char ebuf[1024];
3499 void *load_result;
3500 {
3501 ThreadToNativeFromVM ttnfvm(thread);
3502 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3503 }
3504 if (load_result == NULL) {
3505 if (throwException) {
3506 char msg[1024];
3507 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3508 // Since 'ebuf' may contain a string encoded using
3509 // platform encoding scheme, we need to pass
3510 // Exceptions::unsafe_to_utf8 to the new_exception method
3511 // as the last argument. See bug 6367357.
3512 Handle h_exception =
3513 Exceptions::new_exception(thread,
3514 vmSymbols::java_lang_UnsatisfiedLinkError(),
3515 msg, Exceptions::unsafe_to_utf8);
3516
3517 THROW_HANDLE_0(h_exception);
3518 } else {
3519 log_info(library)("Failed to load library %s", name);
3520 return load_result;
3521 }
3522 }
3523 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3524 return load_result;
3525 JVM_END
3526
3527
3528 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3529 os::dll_unload(handle);
3530 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3531 JVM_END
3532
3533
3534 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3535 void* find_result = os::dll_lookup(handle, name);
3536 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3537 find_result != NULL ? "Found" : "Failed to find",
3538 name, p2i(handle));
3539 return find_result;
3540 JVM_END
3541
3542
3543 // JNI version ///////////////////////////////////////////////////////////////////////////////
3544
3545 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3546 return Threads::is_supported_jni_version_including_1_1(version);
3547 JVM_END
3548
3549
3550 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3551 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3552 JVM_END
3553
3554 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3555 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3556 JVM_END
3557
3558 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3559 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3560 JVM_END
3561
3562 // String support ///////////////////////////////////////////////////////////////////////////
3563
3564 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3565 JvmtiVMObjectAllocEventCollector oam;
3566 if (str == NULL) return NULL;
3567 oop string = JNIHandles::resolve_non_null(str);
3568 oop result = StringTable::intern(string, CHECK_NULL);
3569 return (jstring) JNIHandles::make_local(THREAD, result);
3570 JVM_END
3571
3572
3573 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3574
3575 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3576 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3577 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3578 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3579 // nature. JavaThreads will be "in native" when using this API from JDK code.
3580
3581
3582 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3583 VM_Exit::block_if_vm_exited();
3584 return new PlatformMutex();
3585 }
3586
3587
3588 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3589 VM_Exit::block_if_vm_exited();
3590 delete ((PlatformMutex*) mon);
3591 }
3592
3593
3594 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3595 VM_Exit::block_if_vm_exited();
3596 ((PlatformMutex*) mon)->lock();
3597 return 0;
3598 }
3599
3600
3601 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3602 VM_Exit::block_if_vm_exited();
3603 ((PlatformMutex*) mon)->unlock();
3604 }
3605
3606
3607 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3608
3609 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3610 Handle loader, Handle protection_domain,
3611 jboolean throwError, TRAPS) {
3612 // Security Note:
3613 // The Java level wrapper will perform the necessary security check allowing
3614 // us to pass the NULL as the initiating class loader. The VM is responsible for
3615 // the checkPackageAccess relative to the initiating class loader via the
3616 // protection_domain. The protection_domain is passed as NULL by the java code
3617 // if there is no security manager in 3-arg Class.forName().
3618 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3619
3620 // Check if we should initialize the class
3621 if (init && klass->is_instance_klass()) {
3622 klass->initialize(CHECK_NULL);
3623 }
3624 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3625 }
3626
3627
3628 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3629
3630 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3631 Handle method_handle;
3632 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3633 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3634 Handle receiver(THREAD, JNIHandles::resolve(obj));
3635 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3636 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3637 jobject res = JNIHandles::make_local(THREAD, result);
3638 if (JvmtiExport::should_post_vm_object_alloc()) {
3639 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3640 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3641 if (java_lang_Class::is_primitive(ret_type)) {
3642 // Only for primitive type vm allocates memory for java object.
3643 // See box() method.
3644 JvmtiExport::post_vm_object_alloc(thread, result);
3645 }
3646 }
3647 return res;
3648 } else {
3649 THROW_0(vmSymbols::java_lang_StackOverflowError());
3650 }
3651 JVM_END
3652
3653
3654 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3655 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3656 oop constructor_mirror = JNIHandles::resolve(c);
3657 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3658 jobject res = JNIHandles::make_local(THREAD, result);
3659 if (JvmtiExport::should_post_vm_object_alloc()) {
3660 JvmtiExport::post_vm_object_alloc(thread, result);
3661 }
3662 return res;
3663 JVM_END
3664
3665 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3666
3667 JVM_LEAF(jboolean, JVM_SupportsCX8())
3668 return VM_Version::supports_cx8();
3669 JVM_END
3670
3671 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3672 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3673 assert(k->is_klass(), "just checking");
3674 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3675 JVM_END
3676
3677 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3678 jclass caller,
3679 jstring interfaceMethodName,
3680 jobject factoryType,
3681 jobject interfaceMethodType,
3682 jobject implementationMember,
3683 jobject dynamicMethodType,
3684 jclass lambdaProxyClass))
3685 #if INCLUDE_CDS
3686 if (!Arguments::is_dumping_archive()) {
3687 return;
3688 }
3689
3690 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3691 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3692 if (caller_ik->is_hidden()) {
3693 // Hidden classes not of type lambda proxy classes are currently not being archived.
3694 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3695 // registered for archiving.
3696 return;
3697 }
3698 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3699 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3700 assert(lambda_ik->is_hidden(), "must be a hidden class");
3701 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3702
3703 Symbol* interface_method_name = NULL;
3704 if (interfaceMethodName != NULL) {
3705 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3706 }
3707 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3708 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3709
3710 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3711 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3712
3713 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3714 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3715 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3716
3717 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3718 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3719
3720 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3721 interface_method_type, m, dynamic_method_type, THREAD);
3722 #endif // INCLUDE_CDS
3723 JVM_END
3724
3725 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3726 jclass caller,
3727 jstring interfaceMethodName,
3728 jobject factoryType,
3729 jobject interfaceMethodType,
3730 jobject implementationMember,
3731 jobject dynamicMethodType))
3732 #if INCLUDE_CDS
3733
3734 if (interfaceMethodName == NULL || factoryType == NULL || interfaceMethodType == NULL ||
3735 implementationMember == NULL || dynamicMethodType == NULL) {
3736 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3737 }
3738
3739 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3740 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3741 if (!caller_ik->is_shared()) {
3742 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3743 return NULL;
3744 }
3745
3746 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3747 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3748 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3749
3750 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3751 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3752
3753 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3754 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3755 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3756
3757 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3758 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3759
3760 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3761 interface_method_type, m, dynamic_method_type);
3762 jclass jcls = NULL;
3763 if (lambda_ik != NULL) {
3764 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3765 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3766 }
3767 return jcls;
3768 #else
3769 return NULL;
3770 #endif // INCLUDE_CDS
3771 JVM_END
3772
3773 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3774 return Arguments::is_dumping_archive();
3775 JVM_END
3776
3777 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3778 return UseSharedSpaces;
3779 JVM_END
3780
3781 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3782 if (DumpSharedSpaces) {
3783 const char* release = VM_Version::vm_release();
3784 const char* dbg_level = VM_Version::jdk_debug_level();
3785 const char* version = VM_Version::internal_vm_info_string();
3786 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3787 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3788 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3789 seed += (jlong)VM_Version::vm_major_version();
3790 seed += (jlong)VM_Version::vm_minor_version();
3791 seed += (jlong)VM_Version::vm_security_version();
3792 seed += (jlong)VM_Version::vm_patch_version();
3793 if (seed == 0) { // don't let this ever be zero.
3794 seed = 0x87654321;
3795 }
3796 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3797 return seed;
3798 } else {
3799 return 0;
3800 }
3801 JVM_END
3802
3803 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3804 #if INCLUDE_CDS
3805 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3806 #else
3807 return false;
3808 #endif // INCLUDE_CDS
3809 JVM_END
3810
3811 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3812 #if INCLUDE_CDS
3813 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3814 if (line != NULL) {
3815 ResourceMark rm(THREAD);
3816 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3817 char* c_line = java_lang_String::as_utf8_string(h_line());
3818 if (DynamicDumpSharedSpaces) {
3819 // Note: LambdaFormInvokers::append take same format which is not
3820 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3821 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3822 }
3823 if (ClassListWriter::is_enabled()) {
3824 ClassListWriter w;
3825 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3826 }
3827 }
3828 #endif // INCLUDE_CDS
3829 JVM_END
3830
3831 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3832 #if INCLUDE_CDS
3833 ResourceMark rm(THREAD);
3834 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3835 char* file_name = java_lang_String::as_utf8_string(file_handle());
3836 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3837 #endif // INCLUDE_CDS
3838 JVM_END
3839
3840 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3841 #if INCLUDE_CDS
3842 ResourceMark rm(THREAD);
3843 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3844 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3845 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3846 #endif // INCLUDE_CDS
3847 JVM_END
3848
3849 // Returns an array of all live Thread objects (VM internal JavaThreads,
3850 // jvmti agent threads, and JNI attaching threads are skipped)
3851 // See CR 6404306 regarding JNI attaching threads
3852 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3853 ResourceMark rm(THREAD);
3854 ThreadsListEnumerator tle(THREAD, false, false);
3855 JvmtiVMObjectAllocEventCollector oam;
3856
3857 int num_threads = tle.num_threads();
3858 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3859 objArrayHandle threads_ah(THREAD, r);
3860
3861 for (int i = 0; i < num_threads; i++) {
3862 Handle h = tle.get_threadObj(i);
3863 threads_ah->obj_at_put(i, h());
3864 }
3865
3866 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3867 JVM_END
3868
3869
3870 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3871 // Return StackTraceElement[][], each element is the stack trace of a thread in
3872 // the corresponding entry in the given threads array
3873 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3874 JvmtiVMObjectAllocEventCollector oam;
3875
3876 // Check if threads is null
3877 if (threads == NULL) {
3878 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3879 }
3880
3881 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3882 objArrayHandle ah(THREAD, a);
3883 int num_threads = ah->length();
3884 // check if threads is non-empty array
3885 if (num_threads == 0) {
3886 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3887 }
3888
3889 // check if threads is not an array of objects of Thread class
3890 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3891 if (k != vmClasses::Thread_klass()) {
3892 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3893 }
3894
3895 ResourceMark rm(THREAD);
3896
3897 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3898 for (int i = 0; i < num_threads; i++) {
3899 oop thread_obj = ah->obj_at(i);
3900 instanceHandle h(THREAD, (instanceOop) thread_obj);
3901 thread_handle_array->append(h);
3902 }
3903
3904 // The JavaThread references in thread_handle_array are validated
3905 // in VM_ThreadDump::doit().
3906 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3907 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3908
3909 JVM_END
3910
3911 // JVM monitoring and management support
3912 JVM_LEAF(void*, JVM_GetManagement(jint version))
3913 return Management::get_jmm_interface(version);
3914 JVM_END
3915
3916 // com.sun.tools.attach.VirtualMachine agent properties support
3917 //
3918 // Initialize the agent properties with the properties maintained in the VM
3919 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3920 ResourceMark rm;
3921
3922 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3923
3924 PUTPROP(props, "sun.java.command", Arguments::java_command());
3925 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3926 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3927 return properties;
3928 JVM_END
3929
3930 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3931 {
3932 JvmtiVMObjectAllocEventCollector oam;
3933
3934 if (ofClass == NULL) {
3935 return NULL;
3936 }
3937 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3938 // Special handling for primitive objects
3939 if (java_lang_Class::is_primitive(mirror())) {
3940 return NULL;
3941 }
3942 Klass* k = java_lang_Class::as_Klass(mirror());
3943 if (!k->is_instance_klass()) {
3944 return NULL;
3945 }
3946 InstanceKlass* ik = InstanceKlass::cast(k);
3947 int encl_method_class_idx = ik->enclosing_method_class_index();
3948 if (encl_method_class_idx == 0) {
3949 return NULL;
3950 }
3951 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3952 objArrayHandle dest(THREAD, dest_o);
3953 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3954 dest->obj_at_put(0, enc_k->java_mirror());
3955 int encl_method_method_idx = ik->enclosing_method_method_index();
3956 if (encl_method_method_idx != 0) {
3957 Symbol* sym = ik->constants()->symbol_at(
3958 extract_low_short_from_int(
3959 ik->constants()->name_and_type_at(encl_method_method_idx)));
3960 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3961 dest->obj_at_put(1, str());
3962 sym = ik->constants()->symbol_at(
3963 extract_high_short_from_int(
3964 ik->constants()->name_and_type_at(encl_method_method_idx)));
3965 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3966 dest->obj_at_put(2, str());
3967 }
3968 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3969 }
3970 JVM_END
3971
3972 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3973 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3974 ResourceMark rm(THREAD);
3975
3976 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3977 return NULL;
3978 }
3979
3980 char** vm_flags = Arguments::jvm_flags_array();
3981 char** vm_args = Arguments::jvm_args_array();
3982 int num_flags = Arguments::num_jvm_flags();
3983 int num_args = Arguments::num_jvm_args();
3984
3985 InstanceKlass* ik = vmClasses::String_klass();
3986 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3987 objArrayHandle result_h(THREAD, r);
3988
3989 int index = 0;
3990 for (int j = 0; j < num_flags; j++, index++) {
3991 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3992 result_h->obj_at_put(index, h());
3993 }
3994 for (int i = 0; i < num_args; i++, index++) {
3995 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3996 result_h->obj_at_put(index, h());
3997 }
3998 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3999 JVM_END
4000
4001 JVM_LEAF(jint, JVM_FindSignal(const char *name))
4002 return os::get_signal_number(name);
4003 JVM_END
4004
4005 JVM_ENTRY(void, JVM_VirtualThreadMountBegin(JNIEnv* env, jobject vthread, jboolean first_mount))
4006 #if INCLUDE_JVMTI
4007 if (!DoJVMTIVirtualThreadTransitions) {
4008 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4009 return;
4010 }
4011 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
4012 assert(!thread->is_in_VTMS_transition(), "sanity check");
4013 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ true);
4014 #else
4015 fatal("Should only be called with JVMTI enabled");
4016 #endif
4017 JVM_END
4018
4019 JVM_ENTRY(void, JVM_VirtualThreadMountEnd(JNIEnv* env, jobject vthread, jboolean first_mount))
4020 #if INCLUDE_JVMTI
4021 if (!DoJVMTIVirtualThreadTransitions) {
4022 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4023 return;
4024 }
4025 oop vt = JNIHandles::resolve(vthread);
4026
4027 thread->rebind_to_jvmti_thread_state_of(vt);
4028
4029 {
4030 MutexLocker mu(JvmtiThreadState_lock);
4031 JvmtiThreadState* state = thread->jvmti_thread_state();
4032 if (state != NULL && state->is_pending_interp_only_mode()) {
4033 JvmtiEventController::enter_interp_only_mode();
4034 }
4035 }
4036 assert(thread->is_in_VTMS_transition(), "sanity check");
4037 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
4038 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ true);
4039 if (first_mount) {
4040 // thread start
4041 if (JvmtiExport::can_support_virtual_threads()) {
4042 JvmtiEventController::thread_started(thread);
4043 if (JvmtiExport::should_post_vthread_start()) {
4044 JvmtiExport::post_vthread_start(vthread);
4045 }
4046 } else { // compatibility for vthread unaware agents: legacy thread_start
4047 if (PostVirtualThreadCompatibleLifecycleEvents &&
4048 JvmtiExport::should_post_thread_life()) {
4049 // JvmtiEventController::thread_started is called here
4050 JvmtiExport::post_thread_start(thread);
4051 }
4052 }
4053 }
4054 if (JvmtiExport::should_post_vthread_mount()) {
4055 JvmtiExport::post_vthread_mount(vthread);
4056 }
4057 #else
4058 fatal("Should only be called with JVMTI enabled");
4059 #endif
4060 JVM_END
4061
4062 JVM_ENTRY(void, JVM_VirtualThreadUnmountBegin(JNIEnv* env, jobject vthread, jboolean last_unmount))
4063 #if INCLUDE_JVMTI
4064 if (!DoJVMTIVirtualThreadTransitions) {
4065 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4066 return;
4067 }
4068 HandleMark hm(thread);
4069 Handle ct(thread, thread->threadObj());
4070
4071 if (JvmtiExport::should_post_vthread_unmount()) {
4072 JvmtiExport::post_vthread_unmount(vthread);
4073 }
4074 if (last_unmount) {
4075 if (JvmtiExport::can_support_virtual_threads()) {
4076 if (JvmtiExport::should_post_vthread_end()) {
4077 JvmtiExport::post_vthread_end(vthread);
4078 }
4079 } else { // compatibility for vthread unaware agents: legacy thread_end
4080 if (PostVirtualThreadCompatibleLifecycleEvents &&
4081 JvmtiExport::should_post_thread_life()) {
4082 JvmtiExport::post_thread_end(thread);
4083 }
4084 }
4085 }
4086 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
4087 assert(!thread->is_in_VTMS_transition(), "sanity check");
4088 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ false);
4089
4090 if (last_unmount && thread->jvmti_thread_state() != NULL) {
4091 JvmtiExport::cleanup_thread(thread);
4092 thread->set_jvmti_thread_state(NULL);
4093 oop vt = JNIHandles::resolve(vthread);
4094 java_lang_Thread::set_jvmti_thread_state(vt, NULL);
4095 }
4096 thread->rebind_to_jvmti_thread_state_of(ct());
4097 #else
4098 fatal("Should only be called with JVMTI enabled");
4099 #endif
4100 JVM_END
4101
4102 JVM_ENTRY(void, JVM_VirtualThreadUnmountEnd(JNIEnv* env, jobject vthread, jboolean last_unmount))
4103 #if INCLUDE_JVMTI
4104 if (!DoJVMTIVirtualThreadTransitions) {
4105 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4106 return;
4107 }
4108 assert(thread->is_in_VTMS_transition(), "sanity check");
4109 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
4110 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ false);
4111 #else
4112 fatal("Should only be called with JVMTI enabled");
4113 #endif
4114 JVM_END
4115
4116 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
4117 #if INCLUDE_JVMTI
4118 if (!DoJVMTIVirtualThreadTransitions) {
4119 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4120 return;
4121 }
4122 assert(!thread->is_in_VTMS_transition(), "sanity check");
4123 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
4124 thread->toggle_is_in_tmp_VTMS_transition();
4125 #else
4126 fatal("Should only be called with JVMTI enabled");
4127 #endif
4128 JVM_END
4129
4130 /*
4131 * Return the current class's class file version. The low order 16 bits of the
4132 * returned jint contain the class's major version. The high order 16 bits
4133 * contain the class's minor version.
4134 */
4135 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4136 oop mirror = JNIHandles::resolve_non_null(current);
4137 if (java_lang_Class::is_primitive(mirror)) {
4138 // return latest major version and minor version of 0.
4139 return JVM_CLASSFILE_MAJOR_VERSION;
4140 }
4141 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4142
4143 Klass* c = java_lang_Class::as_Klass(mirror);
4144 assert(c->is_instance_klass(), "must be");
4145 InstanceKlass* ik = InstanceKlass::cast(c);
4146 return (ik->minor_version() << 16) | ik->major_version();
4147 JVM_END
4148
4149 /*
4150 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4151 * get the value will see a materialized value and not a scalar-replaced
4152 * null value.
4153 */
4154 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4155 JVM_EnsureMaterializedForStackWalk(env, value);
4156 JVM_END