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/instanceKlass.hpp"
60 #include "oops/klass.inline.hpp"
61 #include "oops/method.hpp"
62 #include "oops/recordComponent.hpp"
63 #include "oops/objArrayKlass.hpp"
64 #include "oops/objArrayOop.inline.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "prims/jvm_misc.hpp"
67 #include "prims/jvmtiExport.hpp"
68 #include "prims/jvmtiThreadState.inline.hpp"
69 #include "prims/stackwalk.hpp"
70 #include "runtime/arguments.hpp"
71 #include "runtime/atomic.hpp"
72 #include "runtime/continuation.hpp"
73 #include "runtime/globals_extension.hpp"
74 #include "runtime/handles.inline.hpp"
75 #include "runtime/init.hpp"
76 #include "runtime/interfaceSupport.inline.hpp"
77 #include "runtime/deoptimization.hpp"
78 #include "runtime/handshake.hpp"
79 #include "runtime/java.hpp"
80 #include "runtime/javaCalls.hpp"
81 #include "runtime/javaThread.hpp"
82 #include "runtime/jfieldIDWorkaround.hpp"
83 #include "runtime/jniHandles.inline.hpp"
84 #include "runtime/os.inline.hpp"
85 #include "runtime/osThread.hpp"
86 #include "runtime/perfData.hpp"
87 #include "runtime/reflection.hpp"
88 #include "runtime/synchronizer.hpp"
89 #include "runtime/threadIdentifier.hpp"
90 #include "runtime/threadSMR.hpp"
91 #include "runtime/vframe.inline.hpp"
92 #include "runtime/vmOperations.hpp"
93 #include "runtime/vm_version.hpp"
94 #include "services/attachListener.hpp"
95 #include "services/management.hpp"
96 #include "services/threadService.hpp"
97 #include "utilities/copy.hpp"
98 #include "utilities/defaultStream.hpp"
99 #include "utilities/dtrace.hpp"
100 #include "utilities/events.hpp"
101 #include "utilities/macros.hpp"
102 #include "utilities/utf8.hpp"
103 #if INCLUDE_CDS
104 #include "classfile/systemDictionaryShared.hpp"
105 #endif
106 #if INCLUDE_JFR
107 #include "jfr/jfr.hpp"
108 #endif
109 #if INCLUDE_MANAGEMENT
110 #include "services/finalizerService.hpp"
111 #endif
112
113 #include <errno.h>
114
115 /*
116 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
117 such ctors and calls MUST NOT come between an oop declaration/init and its
118 usage because if objects are move this may cause various memory stomps, bus
119 errors and segfaults. Here is a cookbook for causing so called "naked oop
120 failures":
121
122 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
123 // Object address to be held directly in mirror & not visible to GC
124 oop mirror = JNIHandles::resolve_non_null(ofClass);
125
126 // If this ctor can hit a safepoint, moving objects around, then
127 ComplexConstructor foo;
128
129 // Boom! mirror may point to JUNK instead of the intended object
130 (some dereference of mirror)
131
132 // Here's another call that may block for GC, making mirror stale
133 MutexLocker ml(some_lock);
134
135 // And here's an initializer that can result in a stale oop
136 // all in one step.
137 oop o = call_that_can_throw_exception(TRAPS);
138
139
140 The solution is to keep the oop declaration BELOW the ctor or function
141 call that might cause a GC, do another resolve to reassign the oop, or
142 consider use of a Handle instead of an oop so there is immunity from object
143 motion. But note that the "QUICK" entries below do not have a handlemark
144 and thus can only support use of handles passed in.
145 */
146
147 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
148 ResourceMark rm;
149 int line_number = -1;
150 const char * source_file = NULL;
151 const char * trace = "explicit";
152 InstanceKlass* caller = NULL;
153 JavaThread* jthread = THREAD;
154 if (jthread->has_last_Java_frame()) {
155 vframeStream vfst(jthread);
156
157 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
158 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
159 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
160 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
161 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
162
163 Method* last_caller = NULL;
164
165 while (!vfst.at_end()) {
166 Method* m = vfst.method();
167 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
168 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
169 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
170 break;
171 }
172 last_caller = m;
173 vfst.next();
174 }
175 // if this is called from Class.forName0 and that is called from Class.forName,
176 // then print the caller of Class.forName. If this is Class.loadClass, then print
177 // that caller, otherwise keep quiet since this should be picked up elsewhere.
178 bool found_it = false;
179 if (!vfst.at_end() &&
180 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
181 vfst.method()->name() == vmSymbols::forName0_name()) {
182 vfst.next();
183 if (!vfst.at_end() &&
184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
185 vfst.method()->name() == vmSymbols::forName_name()) {
186 vfst.next();
187 found_it = true;
188 }
189 } else if (last_caller != NULL &&
190 last_caller->method_holder()->name() ==
191 vmSymbols::java_lang_ClassLoader() &&
192 last_caller->name() == vmSymbols::loadClass_name()) {
193 found_it = true;
194 } else if (!vfst.at_end()) {
195 if (vfst.method()->is_native()) {
196 // JNI call
197 found_it = true;
198 }
199 }
200 if (found_it && !vfst.at_end()) {
201 // found the caller
202 caller = vfst.method()->method_holder();
203 line_number = vfst.method()->line_number_from_bci(vfst.bci());
204 if (line_number == -1) {
205 // show method name if it's a native method
206 trace = vfst.method()->name_and_sig_as_C_string();
207 }
208 Symbol* s = caller->source_file_name();
209 if (s != NULL) {
210 source_file = s->as_C_string();
211 }
212 }
213 }
214 if (caller != NULL) {
215 if (to_class != caller) {
216 const char * from = caller->external_name();
217 const char * to = to_class->external_name();
218 // print in a single call to reduce interleaving between threads
219 if (source_file != NULL) {
220 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
221 } else {
222 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
223 }
224 }
225 }
226 }
227
228 void trace_class_resolution(Klass* to_class) {
229 EXCEPTION_MARK;
230 trace_class_resolution_impl(to_class, THREAD);
231 if (HAS_PENDING_EXCEPTION) {
232 CLEAR_PENDING_EXCEPTION;
233 }
234 }
235
236 // java.lang.System //////////////////////////////////////////////////////////////////////
237
238
239 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
240 return os::javaTimeMillis();
241 JVM_END
242
243 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
244 return os::javaTimeNanos();
245 JVM_END
246
247 // The function below is actually exposed by jdk.internal.misc.VM and not
248 // java.lang.System, but we choose to keep it here so that it stays next
249 // to JVM_CurrentTimeMillis and JVM_NanoTime
250
251 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
252 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
253
254 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
255 jlong seconds;
256 jlong nanos;
257
258 os::javaTimeSystemUTC(seconds, nanos);
259
260 // We're going to verify that the result can fit in a long.
261 // For that we need the difference in seconds between 'seconds'
262 // and 'offset_secs' to be such that:
263 // |seconds - offset_secs| < (2^63/10^9)
264 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
265 // which makes |seconds - offset_secs| < 2^33
266 // and we will prefer +/- 2^32 as the maximum acceptable diff
267 // as 2^32 has a more natural feel than 2^33...
268 //
269 // So if |seconds - offset_secs| >= 2^32 - we return a special
270 // sentinel value (-1) which the caller should take as an
271 // exception value indicating that the offset given to us is
272 // too far from range of the current time - leading to too big
273 // a nano adjustment. The caller is expected to recover by
274 // computing a more accurate offset and calling this method
275 // again. (For the record 2^32 secs is ~136 years, so that
276 // should rarely happen)
277 //
278 jlong diff = seconds - offset_secs;
279 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
280 return -1; // sentinel value: the offset is too far off the target
281 }
282
283 // return the adjustment. If you compute a time by adding
284 // this number of nanoseconds along with the number of seconds
285 // in the offset you should get the current UTC time.
286 return (diff * (jlong)1000000000) + nanos;
287 JVM_END
288
289 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
290 jobject dst, jint dst_pos, jint length))
291 // Check if we have null pointers
292 if (src == NULL || dst == NULL) {
293 THROW(vmSymbols::java_lang_NullPointerException());
294 }
295 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
296 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
297 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
298 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
299 // Do copy
300 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
301 JVM_END
302
303
304 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
305 JavaValue r(T_OBJECT);
306 // public synchronized Object put(Object key, Object value);
307 HandleMark hm(THREAD);
308 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
309 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
310 JavaCalls::call_virtual(&r,
311 props,
312 vmClasses::Properties_klass(),
313 vmSymbols::put_name(),
314 vmSymbols::object_object_object_signature(),
315 key_str,
316 value_str,
317 THREAD);
318 }
319
320
321 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
322
323 /*
324 * Return all of the system properties in a Java String array with alternating
325 * names and values from the jvm SystemProperty.
326 * Which includes some internal and all commandline -D defined properties.
327 */
328 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
329 ResourceMark rm(THREAD);
330 HandleMark hm(THREAD);
331 int ndx = 0;
332 int fixedCount = 2;
333
334 SystemProperty* p = Arguments::system_properties();
335 int count = Arguments::PropertyList_count(p);
336
337 // Allocate result String array
338 InstanceKlass* ik = vmClasses::String_klass();
339 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
340 objArrayHandle result_h(THREAD, r);
341
342 while (p != NULL) {
343 const char * key = p->key();
344 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
345 const char * value = p->value();
346 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
347 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
348 result_h->obj_at_put(ndx * 2, key_str());
349 result_h->obj_at_put(ndx * 2 + 1, value_str());
350 ndx++;
351 }
352 p = p->next();
353 }
354
355 // Convert the -XX:MaxDirectMemorySize= command line flag
356 // to the sun.nio.MaxDirectMemorySize property.
357 // Do this after setting user properties to prevent people
358 // from setting the value with a -D option, as requested.
359 // Leave empty if not supplied
360 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
361 char as_chars[256];
362 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
363 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
364 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
365 result_h->obj_at_put(ndx * 2, key_str());
366 result_h->obj_at_put(ndx * 2 + 1, value_str());
367 ndx++;
368 }
369
370 // JVM monitoring and management support
371 // Add the sun.management.compiler property for the compiler's name
372 {
373 #undef CSIZE
374 #if defined(_LP64) || defined(_WIN64)
375 #define CSIZE "64-Bit "
376 #else
377 #define CSIZE
378 #endif // 64bit
379
380 #if COMPILER1_AND_COMPILER2
381 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
382 #else
383 #if defined(COMPILER1)
384 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
385 #elif defined(COMPILER2)
386 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
387 #elif INCLUDE_JVMCI
388 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
389 #else
390 const char* compiler_name = "";
391 #endif // compilers
392 #endif // COMPILER1_AND_COMPILER2
393
394 if (*compiler_name != '\0' &&
395 (Arguments::mode() != Arguments::_int)) {
396 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
397 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
398 result_h->obj_at_put(ndx * 2, key_str());
399 result_h->obj_at_put(ndx * 2 + 1, value_str());
400 ndx++;
401 }
402 }
403
404 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
405 JVM_END
406
407
408 /*
409 * Return the temporary directory that the VM uses for the attach
410 * and perf data files.
411 *
412 * It is important that this directory is well-known and the
413 * same for all VM instances. It cannot be affected by configuration
414 * variables such as java.io.tmpdir.
415 */
416 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
417 HandleMark hm(THREAD);
418 const char* temp_dir = os::get_temp_directory();
419 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
420 return (jstring) JNIHandles::make_local(THREAD, h());
421 JVM_END
422
423
424 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
425
426 extern volatile jint vm_created;
427
428 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
429 #if INCLUDE_CDS
430 // Link all classes for dynamic CDS dumping before vm exit.
431 if (DynamicArchive::should_dump_at_vm_exit()) {
432 DynamicArchive::prepare_for_dump_at_exit();
433 }
434 #endif
435 EventShutdown event;
436 if (event.should_commit()) {
437 event.set_reason("Shutdown requested from Java");
438 event.commit();
439 }
440 JVM_END
441
442
443 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
444 before_exit(thread, true);
445 vm_exit(code);
446 JVM_END
447
448
449 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
450 if (!DisableExplicitGC) {
451 EventSystemGC event;
452 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
453 Universe::heap()->collect(GCCause::_java_lang_system_gc);
454 event.commit();
455 }
456 JVM_END
457
458
459 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
460 return Universe::heap()->millis_since_last_whole_heap_examined();
461 JVM_END
462
463
464 static inline jlong convert_size_t_to_jlong(size_t val) {
465 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
466 NOT_LP64 (return (jlong)val;)
467 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
468 }
469
470 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
471 size_t n = Universe::heap()->capacity();
472 return convert_size_t_to_jlong(n);
473 JVM_END
474
475
476 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
477 size_t n = Universe::heap()->unused();
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
483 size_t n = Universe::heap()->max_capacity();
484 return convert_size_t_to_jlong(n);
485 JVM_END
486
487
488 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
489 return os::active_processor_count();
490 JVM_END
491
492 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
493 #ifdef LINUX
494 if (UseContainerSupport) {
495 return JNI_TRUE;
496 }
497 #endif
498 return JNI_FALSE;
499 JVM_END
500
501 // java.lang.Throwable //////////////////////////////////////////////////////
502
503 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
504 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
505 java_lang_Throwable::fill_in_stack_trace(exception);
506 JVM_END
507
508 // java.lang.NullPointerException ///////////////////////////////////////////
509
510 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
511 if (!ShowCodeDetailsInExceptionMessages) return NULL;
512
513 oop exc = JNIHandles::resolve_non_null(throwable);
514
515 Method* method;
516 int bci;
517 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
518 return NULL;
519 }
520 if (method->is_native()) {
521 return NULL;
522 }
523
524 stringStream ss;
525 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
526 if (ok) {
527 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
528 return (jstring) JNIHandles::make_local(THREAD, result);
529 } else {
530 return NULL;
531 }
532 JVM_END
533
534 // java.lang.StackTraceElement //////////////////////////////////////////////
535
536
537 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
538 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
539 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
540 objArrayHandle stack_trace(THREAD, st);
541 // Fill in the allocated stack trace
542 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
543 JVM_END
544
545
546 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
547 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
548 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
549 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
550 JVM_END
551
552
553 // java.lang.StackWalker //////////////////////////////////////////////////////
554
555
556 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
557 jint skip_frames, jobject contScope, jobject cont,
558 jint frame_count, jint start_index, jobjectArray frames))
559 if (!thread->has_last_Java_frame()) {
560 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
561 }
562
563 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
564 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
565 Handle cont_h(THREAD, JNIHandles::resolve(cont));
566 // frames array is a Class<?>[] array when only getting caller reference,
567 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
568 // be null.
569 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
570 objArrayHandle frames_array_h(THREAD, fa);
571
572 int limit = start_index + frame_count;
573 if (frames_array_h->length() < limit) {
574 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
575 }
576
577 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
578 frame_count, start_index, frames_array_h, CHECK_NULL);
579 return JNIHandles::make_local(THREAD, result);
580 JVM_END
581
582
583 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
584 jint frame_count, jint start_index,
585 jobjectArray frames))
586 // frames array is a Class<?>[] array when only getting caller reference,
587 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
588 // be null.
589 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
590 objArrayHandle frames_array_h(THREAD, fa);
591
592 int limit = start_index+frame_count;
593 if (frames_array_h->length() < limit) {
594 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
595 }
596
597 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
598 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
599 start_index, frames_array_h, THREAD);
600 JVM_END
601
602 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
603 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
604 objArrayHandle frames_array_h(THREAD, fa);
605 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
606 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
607
608 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
609 JVM_END
610
611 // java.lang.Object ///////////////////////////////////////////////
612
613
614 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
615 // as implemented in the classic virtual machine; return 0 if object is NULL
616 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
617 JVM_END
618
619
620 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
621 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
622 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
623 if (JvmtiExport::should_post_monitor_wait()) {
624 JvmtiExport::post_monitor_wait(thread, obj(), ms);
625
626 // The current thread already owns the monitor and it has not yet
627 // been added to the wait queue so the current thread cannot be
628 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
629 // event handler cannot accidentally consume an unpark() meant for
630 // the ParkEvent associated with this ObjectMonitor.
631 }
632 ObjectSynchronizer::wait(obj, ms, CHECK);
633 JVM_END
634
635
636 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
637 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
638 ObjectSynchronizer::notify(obj, CHECK);
639 JVM_END
640
641
642 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
643 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
644 ObjectSynchronizer::notifyall(obj, CHECK);
645 JVM_END
646
647
648 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
649 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
650 Klass* klass = obj->klass();
651 JvmtiVMObjectAllocEventCollector oam;
652
653 #ifdef ASSERT
654 // Just checking that the cloneable flag is set correct
655 if (obj->is_array()) {
656 guarantee(klass->is_cloneable(), "all arrays are cloneable");
657 } else {
658 guarantee(obj->is_instance(), "should be instanceOop");
659 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
660 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
661 }
662 #endif
663
664 // Check if class of obj supports the Cloneable interface.
665 // All arrays are considered to be cloneable (See JLS 20.1.5).
666 // All j.l.r.Reference classes are considered non-cloneable.
667 if (!klass->is_cloneable() ||
668 (klass->is_instance_klass() &&
669 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
670 ResourceMark rm(THREAD);
671 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
672 }
673
674 // Make shallow object copy
675 const size_t size = obj->size();
676 oop new_obj_oop = NULL;
677 if (obj->is_array()) {
678 const int length = ((arrayOop)obj())->length();
679 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
680 /* do_zero */ true, CHECK_NULL);
681 } else {
682 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
683 }
684
685 HeapAccess<>::clone(obj(), new_obj_oop, size);
686
687 Handle new_obj(THREAD, new_obj_oop);
688 // Caution: this involves a java upcall, so the clone should be
689 // "gc-robust" by this stage.
690 if (klass->has_finalizer()) {
691 assert(obj->is_instance(), "should be instanceOop");
692 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
693 new_obj = Handle(THREAD, new_obj_oop);
694 }
695
696 return JNIHandles::make_local(THREAD, new_obj());
697 JVM_END
698
699 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
700
701 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
702 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
703 JVM_END
704
705 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
706 return InstanceKlass::is_finalization_enabled();
707 JVM_END
708
709 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
710
711 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
712 CONT_RegisterNativeMethods(env, cls);
713 JVM_END
714
715 // java.io.File ///////////////////////////////////////////////////////////////
716
717 JVM_LEAF(char*, JVM_NativePath(char* path))
718 return os::native_path(path);
719 JVM_END
720
721
722 // Misc. class handling ///////////////////////////////////////////////////////////
723
724
725 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
726 // Getting the class of the caller frame.
727 //
728 // The call stack at this point looks something like this:
729 //
730 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
731 // [1] [ @CallerSensitive API.method ]
732 // [.] [ (skipped intermediate frames) ]
733 // [n] [ caller ]
734 vframeStream vfst(thread);
735 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
736 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
737 Method* m = vfst.method();
738 assert(m != NULL, "sanity");
739 switch (n) {
740 case 0:
741 // This must only be called from Reflection.getCallerClass
742 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
743 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
744 }
745 // fall-through
746 case 1:
747 // Frame 0 and 1 must be caller sensitive.
748 if (!m->caller_sensitive()) {
749 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
750 }
751 break;
752 default:
753 if (!m->is_ignored_by_security_stack_walk()) {
754 // We have reached the desired frame; return the holder class.
755 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
756 }
757 break;
758 }
759 }
760 return NULL;
761 JVM_END
762
763
764 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
765 oop mirror = NULL;
766 BasicType t = name2type(utf);
767 if (t != T_ILLEGAL && !is_reference_type(t)) {
768 mirror = Universe::java_mirror(t);
769 }
770 if (mirror == NULL) {
771 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
772 } else {
773 return (jclass) JNIHandles::make_local(THREAD, mirror);
774 }
775 JVM_END
776
777
778 // Returns a class loaded by the bootstrap class loader; or null
779 // if not found. ClassNotFoundException is not thrown.
780 // FindClassFromBootLoader is exported to the launcher for windows.
781 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
782 const char* name))
783 // Java libraries should ensure that name is never null or illegal.
784 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
785 // It's impossible to create this class; the name cannot fit
786 // into the constant pool.
787 return NULL;
788 }
789 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
790
791 TempNewSymbol h_name = SymbolTable::new_symbol(name);
792 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
793 if (k == NULL) {
794 return NULL;
795 }
796
797 if (log_is_enabled(Debug, class, resolve)) {
798 trace_class_resolution(k);
799 }
800 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
801 JVM_END
802
803 // Find a class with this name in this loader, using the caller's protection domain.
804 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
805 jboolean init, jobject loader,
806 jclass caller))
807 TempNewSymbol h_name =
808 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
809 CHECK_NULL);
810
811 oop loader_oop = JNIHandles::resolve(loader);
812 oop from_class = JNIHandles::resolve(caller);
813 oop protection_domain = NULL;
814 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
815 // NPE. Put it in another way, the bootstrap class loader has all permission and
816 // thus no checkPackageAccess equivalence in the VM class loader.
817 // The caller is also passed as NULL by the java code if there is no security
818 // manager to avoid the performance cost of getting the calling class.
819 if (from_class != NULL && loader_oop != NULL) {
820 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
821 }
822
823 Handle h_loader(THREAD, loader_oop);
824 Handle h_prot(THREAD, protection_domain);
825 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
826 h_prot, false, THREAD);
827
828 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
829 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
830 }
831 return result;
832 JVM_END
833
834 // Currently only called from the old verifier.
835 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
836 jboolean init, jclass from))
837 TempNewSymbol h_name =
838 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
839 CHECK_NULL);
840 oop from_class_oop = JNIHandles::resolve(from);
841 Klass* from_class = (from_class_oop == NULL)
842 ? (Klass*)NULL
843 : java_lang_Class::as_Klass(from_class_oop);
844 oop class_loader = NULL;
845 oop protection_domain = NULL;
846 if (from_class != NULL) {
847 class_loader = from_class->class_loader();
848 protection_domain = from_class->protection_domain();
849 }
850 Handle h_loader(THREAD, class_loader);
851 Handle h_prot (THREAD, protection_domain);
852 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
853 h_prot, true, thread);
854
855 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
856 // this function is generally only used for class loading during verification.
857 ResourceMark rm;
858 oop from_mirror = JNIHandles::resolve_non_null(from);
859 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
860 const char * from_name = from_class->external_name();
861
862 oop mirror = JNIHandles::resolve_non_null(result);
863 Klass* to_class = java_lang_Class::as_Klass(mirror);
864 const char * to = to_class->external_name();
865 log_debug(class, resolve)("%s %s (verification)", from_name, to);
866 }
867
868 return result;
869 JVM_END
870
871 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
872 static jclass jvm_define_class_common(const char *name,
873 jobject loader, const jbyte *buf,
874 jsize len, jobject pd, const char *source,
875 TRAPS) {
876 if (source == NULL) source = "__JVM_DefineClass__";
877
878 JavaThread* jt = THREAD;
879
880 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
881 ClassLoader::perf_define_appclass_selftime(),
882 ClassLoader::perf_define_appclasses(),
883 jt->get_thread_stat()->perf_recursion_counts_addr(),
884 jt->get_thread_stat()->perf_timers_addr(),
885 PerfClassTraceTime::DEFINE_CLASS);
886
887 if (UsePerfData) {
888 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
889 }
890
891 // Class resolution will get the class name from the .class stream if the name is null.
892 TempNewSymbol class_name = name == NULL ? NULL :
893 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
894 CHECK_NULL);
895
896 ResourceMark rm(THREAD);
897 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
898 Handle class_loader (THREAD, JNIHandles::resolve(loader));
899 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
900 ClassLoadInfo cl_info(protection_domain);
901 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
902 class_loader,
903 cl_info,
904 CHECK_NULL);
905
906 if (log_is_enabled(Debug, class, resolve)) {
907 trace_class_resolution(k);
908 }
909
910 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
911 }
912
913 enum {
914 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
915 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
916 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
917 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
918 };
919
920 /*
921 * Define a class with the specified flags that indicates if it's a nestmate,
922 * hidden, or strongly referenced from class loader.
923 */
924 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
925 const jbyte *buf, jsize len, jobject pd,
926 jboolean init, int flags, jobject classData, TRAPS) {
927 ResourceMark rm(THREAD);
928
929 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
930 // Lookup class must be a non-null instance
931 if (lookup_k == NULL) {
932 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
933 }
934 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
935
936 Handle class_loader (THREAD, lookup_k->class_loader());
937
938 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
939 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
940 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
941 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
942
943 InstanceKlass* host_class = NULL;
944 if (is_nestmate) {
945 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
946 }
947
948 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
949 name,
950 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
951 is_nestmate ? host_class->external_name() : "",
952 is_hidden ? "hidden" : "not hidden",
953 is_strong ? "strong" : "weak",
954 vm_annotations ? "with vm annotations" : "without vm annotation");
955
956 if (!is_hidden) {
957 // classData is only applicable for hidden classes
958 if (classData != NULL) {
959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
960 }
961 if (is_nestmate) {
962 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
963 }
964 if (!is_strong) {
965 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
966 }
967 if (vm_annotations) {
968 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
969 }
970 if (flags != STRONG_LOADER_LINK) {
971 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
972 err_msg("invalid flag 0x%x", flags));
973 }
974 }
975
976 // Class resolution will get the class name from the .class stream if the name is null.
977 TempNewSymbol class_name = name == NULL ? NULL :
978 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
979 CHECK_NULL);
980
981 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
982 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
983 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
984
985 InstanceKlass* ik = NULL;
986 if (!is_hidden) {
987 ClassLoadInfo cl_info(protection_domain);
988 ik = SystemDictionary::resolve_from_stream(&st, class_name,
989 class_loader,
990 cl_info,
991 CHECK_NULL);
992
993 if (log_is_enabled(Debug, class, resolve)) {
994 trace_class_resolution(ik);
995 }
996 } else { // hidden
997 Handle classData_h(THREAD, JNIHandles::resolve(classData));
998 ClassLoadInfo cl_info(protection_domain,
999 host_class,
1000 classData_h,
1001 is_hidden,
1002 is_strong,
1003 vm_annotations);
1004 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1005 class_loader,
1006 cl_info,
1007 CHECK_NULL);
1008
1009 // The hidden class loader data has been artificially been kept alive to
1010 // this point. The mirror and any instances of this class have to keep
1011 // it alive afterwards.
1012 ik->class_loader_data()->dec_keep_alive();
1013
1014 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1015 ModuleEntry* module = ik->module();
1016 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1017 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1018 module_name,
1019 ik->external_name(),
1020 host_class->external_name(),
1021 ik->is_hidden() ? "is hidden" : "is not hidden");
1022 }
1023 }
1024 assert(Reflection::is_same_class_package(lookup_k, ik),
1025 "lookup class and defined class are in different packages");
1026
1027 if (init) {
1028 ik->initialize(CHECK_NULL);
1029 } else {
1030 ik->link_class(CHECK_NULL);
1031 }
1032
1033 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1034 }
1035
1036 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1037 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1038 JVM_END
1039
1040 /*
1041 * Define a class with the specified lookup class.
1042 * lookup: Lookup class
1043 * name: the name of the class
1044 * buf: class bytes
1045 * len: length of class bytes
1046 * pd: protection domain
1047 * init: initialize the class
1048 * flags: properties of the class
1049 * classData: private static pre-initialized field
1050 */
1051 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1052 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1053
1054 if (lookup == NULL) {
1055 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1056 }
1057
1058 assert(buf != NULL, "buf must not be NULL");
1059
1060 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1061 JVM_END
1062
1063 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1064
1065 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1066 JVM_END
1067
1068 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1069 ResourceMark rm(THREAD);
1070
1071 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1072 char* str = java_lang_String::as_utf8_string(h_name());
1073
1074 // Sanity check, don't expect null
1075 if (str == NULL) return NULL;
1076
1077 // Internalize the string, converting '.' to '/' in string.
1078 char* p = (char*)str;
1079 while (*p != '\0') {
1080 if (*p == '.') {
1081 *p = '/';
1082 }
1083 p++;
1084 }
1085
1086 const int str_len = (int)(p - str);
1087 if (str_len > Symbol::max_length()) {
1088 // It's impossible to create this class; the name cannot fit
1089 // into the constant pool.
1090 return NULL;
1091 }
1092 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1093
1094 // Security Note:
1095 // The Java level wrapper will perform the necessary security check allowing
1096 // us to pass the NULL as the initiating class loader.
1097 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1098 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1099 h_loader,
1100 Handle());
1101 #if INCLUDE_CDS
1102 if (k == NULL) {
1103 // If the class is not already loaded, try to see if it's in the shared
1104 // archive for the current classloader (h_loader).
1105 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1106 }
1107 #endif
1108 return (k == NULL) ? NULL :
1109 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1110 JVM_END
1111
1112 // Module support //////////////////////////////////////////////////////////////////////////////
1113
1114 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1115 jstring location, jobjectArray packages))
1116 Handle h_module (THREAD, JNIHandles::resolve(module));
1117 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1118 JVM_END
1119
1120 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1121 Handle h_module (THREAD, JNIHandles::resolve(module));
1122 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1123 JVM_END
1124
1125 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1126 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1127 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1128 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1129 JVM_END
1130
1131 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1132 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1133 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1134 JVM_END
1135
1136 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1137 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1138 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1139 JVM_END
1140
1141 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1142 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1143 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1144 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1145 JVM_END
1146
1147 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1148 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1149 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1150 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1151 JVM_END
1152
1153 // Reflection support //////////////////////////////////////////////////////////////////////////////
1154
1155 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1156 assert (cls != NULL, "illegal class");
1157 JvmtiVMObjectAllocEventCollector oam;
1158 ResourceMark rm(THREAD);
1159 HandleMark hm(THREAD);
1160 Handle java_class(THREAD, JNIHandles::resolve(cls));
1161 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1162 return (jstring) JNIHandles::make_local(THREAD, result);
1163 JVM_END
1164
1165
1166 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1167 JvmtiVMObjectAllocEventCollector oam;
1168 oop mirror = JNIHandles::resolve_non_null(cls);
1169
1170 // Special handling for primitive objects
1171 if (java_lang_Class::is_primitive(mirror)) {
1172 // Primitive objects does not have any interfaces
1173 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1174 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1175 }
1176
1177 Klass* klass = java_lang_Class::as_Klass(mirror);
1178 // Figure size of result array
1179 int size;
1180 if (klass->is_instance_klass()) {
1181 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1182 } else {
1183 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1184 size = 2;
1185 }
1186
1187 // Allocate result array
1188 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1189 objArrayHandle result (THREAD, r);
1190 // Fill in result
1191 if (klass->is_instance_klass()) {
1192 // Regular instance klass, fill in all local interfaces
1193 for (int index = 0; index < size; index++) {
1194 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1195 result->obj_at_put(index, k->java_mirror());
1196 }
1197 } else {
1198 // All arrays implement java.lang.Cloneable and java.io.Serializable
1199 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1200 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1201 }
1202 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1203 JVM_END
1204
1205
1206 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1207 oop mirror = JNIHandles::resolve_non_null(cls);
1208 if (java_lang_Class::is_primitive(mirror)) {
1209 return JNI_FALSE;
1210 }
1211 Klass* k = java_lang_Class::as_Klass(mirror);
1212 jboolean result = k->is_interface();
1213 assert(!result || k->is_instance_klass(),
1214 "all interfaces are instance types");
1215 // The compiler intrinsic for isInterface tests the
1216 // Klass::_access_flags bits in the same way.
1217 return result;
1218 JVM_END
1219
1220 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1221 oop mirror = JNIHandles::resolve_non_null(cls);
1222 if (java_lang_Class::is_primitive(mirror)) {
1223 return JNI_FALSE;
1224 }
1225 Klass* k = java_lang_Class::as_Klass(mirror);
1226 return k->is_hidden();
1227 JVM_END
1228
1229 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1230 JvmtiVMObjectAllocEventCollector oam;
1231 oop mirror = JNIHandles::resolve_non_null(cls);
1232 if (java_lang_Class::is_primitive(mirror)) {
1233 // There are no signers for primitive types
1234 return NULL;
1235 }
1236
1237 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1238
1239 // If there are no signers set in the class, or if the class
1240 // is an array, return NULL.
1241 if (signers == NULL) return NULL;
1242
1243 // copy of the signers array
1244 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1245 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1246 for (int index = 0; index < signers->length(); index++) {
1247 signers_copy->obj_at_put(index, signers->obj_at(index));
1248 }
1249
1250 // return the copy
1251 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1252 JVM_END
1253
1254
1255 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1256 oop mirror = JNIHandles::resolve_non_null(cls);
1257 if (!java_lang_Class::is_primitive(mirror)) {
1258 // This call is ignored for primitive types and arrays.
1259 // Signers are only set once, ClassLoader.java, and thus shouldn't
1260 // be called with an array. Only the bootstrap loader creates arrays.
1261 Klass* k = java_lang_Class::as_Klass(mirror);
1262 if (k->is_instance_klass()) {
1263 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1264 }
1265 }
1266 JVM_END
1267
1268
1269 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1270 oop mirror = JNIHandles::resolve_non_null(cls);
1271 if (mirror == NULL) {
1272 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1273 }
1274
1275 if (java_lang_Class::is_primitive(mirror)) {
1276 // Primitive types does not have a protection domain.
1277 return NULL;
1278 }
1279
1280 oop pd = java_lang_Class::protection_domain(mirror);
1281 return (jobject) JNIHandles::make_local(THREAD, pd);
1282 JVM_END
1283
1284
1285 // Returns the inherited_access_control_context field of the running thread.
1286 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1287 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1288 return JNIHandles::make_local(THREAD, result);
1289 JVM_END
1290
1291 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1292 if (!UsePrivilegedStack) return NULL;
1293
1294 ResourceMark rm(THREAD);
1295 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1296 JvmtiVMObjectAllocEventCollector oam;
1297
1298 // count the protection domains on the execution stack. We collapse
1299 // duplicate consecutive protection domains into a single one, as
1300 // well as stopping when we hit a privileged frame.
1301
1302 oop previous_protection_domain = NULL;
1303 Handle privileged_context(thread, NULL);
1304 bool is_privileged = false;
1305 oop protection_domain = NULL;
1306
1307 // Iterate through Java frames
1308 vframeStream vfst(thread);
1309 for(; !vfst.at_end(); vfst.next()) {
1310 // get method of frame
1311 Method* method = vfst.method();
1312
1313 // stop at the first privileged frame
1314 if (method->method_holder() == vmClasses::AccessController_klass() &&
1315 method->name() == vmSymbols::executePrivileged_name())
1316 {
1317 // this frame is privileged
1318 is_privileged = true;
1319
1320 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1321
1322 StackValueCollection* locals = priv->locals();
1323 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1324 StackValue* clr_sv = locals->at(2); // Class<?> caller
1325 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1326 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1327 privileged_context = ctx_sv->get_obj();
1328 Handle caller = clr_sv->get_obj();
1329
1330 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1331 protection_domain = caller_klass->protection_domain();
1332 } else {
1333 protection_domain = method->method_holder()->protection_domain();
1334 }
1335
1336 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1337 local_array->push(Handle(thread, protection_domain));
1338 previous_protection_domain = protection_domain;
1339 }
1340
1341 if (is_privileged) break;
1342 }
1343
1344
1345 // either all the domains on the stack were system domains, or
1346 // we had a privileged system domain
1347 if (local_array->is_empty()) {
1348 if (is_privileged && privileged_context.is_null()) return NULL;
1349
1350 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1351 return JNIHandles::make_local(THREAD, result);
1352 }
1353
1354 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1355 local_array->length(), CHECK_NULL);
1356 objArrayHandle h_context(thread, context);
1357 for (int index = 0; index < local_array->length(); index++) {
1358 h_context->obj_at_put(index, local_array->at(index)());
1359 }
1360
1361 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1362
1363 return JNIHandles::make_local(THREAD, result);
1364 JVM_END
1365
1366 class ScopedValueBindingsResolver {
1367 public:
1368 InstanceKlass* Carrier_klass;
1369 ScopedValueBindingsResolver(JavaThread* THREAD) {
1370 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_incubator_concurrent_ScopedValue_Carrier(), true, THREAD);
1371 Carrier_klass = InstanceKlass::cast(k);
1372 }
1373 };
1374
1375 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1376 ResourceMark rm(THREAD);
1377 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1378 JvmtiVMObjectAllocEventCollector oam;
1379
1380 bool found = false;
1381
1382 static ScopedValueBindingsResolver resolver(THREAD);
1383
1384 // Iterate through Java frames
1385 vframeStream vfst(thread);
1386 for(; !vfst.at_end(); vfst.next()) {
1387 int loc = 0;
1388 // get method of frame
1389 Method* method = vfst.method();
1390
1391 Symbol *name = method->name();
1392
1393 InstanceKlass* holder = method->method_holder();
1394 if (name == vmSymbols::runWith_method_name()) {
1395 if ((holder == resolver.Carrier_klass
1396 || holder == vmClasses::VirtualThread_klass()
1397 || holder == vmClasses::Thread_klass())) {
1398 loc = 1;
1399 }
1400 }
1401
1402 if (loc != 0) {
1403 javaVFrame *frame = vfst.asJavaVFrame();
1404 StackValueCollection* locals = frame->locals();
1405 StackValue* head_sv = locals->at(loc); // jdk/incubator/concurrent/ScopedValue$Snapshot
1406 Handle result = head_sv->get_obj();
1407 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1408 if (result() != NULL) {
1409 return JNIHandles::make_local(THREAD, result());
1410 }
1411 }
1412 }
1413
1414 return NULL;
1415 JVM_END
1416
1417 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1419 return (k != NULL) && k->is_array_klass() ? true : false;
1420 JVM_END
1421
1422
1423 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1424 oop mirror = JNIHandles::resolve_non_null(cls);
1425 return (jboolean) java_lang_Class::is_primitive(mirror);
1426 JVM_END
1427
1428
1429 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1430 oop mirror = JNIHandles::resolve_non_null(cls);
1431 if (java_lang_Class::is_primitive(mirror)) {
1432 // Primitive type
1433 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1434 }
1435
1436 Klass* k = java_lang_Class::as_Klass(mirror);
1437 debug_only(int computed_modifiers = k->compute_modifier_flags());
1438 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1439 return k->modifier_flags();
1440 JVM_END
1441
1442
1443 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1444
1445 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1446 JvmtiVMObjectAllocEventCollector oam;
1447 // ofClass is a reference to a java_lang_Class object. The mirror object
1448 // of an InstanceKlass
1449 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1450 if (java_lang_Class::is_primitive(ofMirror) ||
1451 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1452 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1453 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1454 }
1455
1456 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1457 InnerClassesIterator iter(k);
1458
1459 if (iter.length() == 0) {
1460 // Neither an inner nor outer class
1461 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1462 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1463 }
1464
1465 // find inner class info
1466 constantPoolHandle cp(thread, k->constants());
1467 int length = iter.length();
1468
1469 // Allocate temp. result array
1470 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1471 objArrayHandle result (THREAD, r);
1472 int members = 0;
1473
1474 for (; !iter.done(); iter.next()) {
1475 int ioff = iter.inner_class_info_index();
1476 int ooff = iter.outer_class_info_index();
1477
1478 if (ioff != 0 && ooff != 0) {
1479 // Check to see if the name matches the class we're looking for
1480 // before attempting to find the class.
1481 if (cp->klass_name_at_matches(k, ooff)) {
1482 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1483 if (outer_klass == k) {
1484 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1485 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1486
1487 // Throws an exception if outer klass has not declared k as
1488 // an inner klass
1489 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1490
1491 result->obj_at_put(members, inner_klass->java_mirror());
1492 members++;
1493 }
1494 }
1495 }
1496 }
1497
1498 if (members != length) {
1499 // Return array of right length
1500 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1501 for(int i = 0; i < members; i++) {
1502 res->obj_at_put(i, result->obj_at(i));
1503 }
1504 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1505 }
1506
1507 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1508 JVM_END
1509
1510
1511 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1512 {
1513 // ofClass is a reference to a java_lang_Class object.
1514 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1515 if (java_lang_Class::is_primitive(ofMirror)) {
1516 return NULL;
1517 }
1518 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1519 if (!klass->is_instance_klass()) {
1520 return NULL;
1521 }
1522
1523 bool inner_is_member = false;
1524 Klass* outer_klass
1525 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1526 if (outer_klass == NULL) return NULL; // already a top-level class
1527 if (!inner_is_member) return NULL; // a hidden class (inside a method)
1528 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1529 }
1530 JVM_END
1531
1532 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1533 {
1534 oop mirror = JNIHandles::resolve_non_null(cls);
1535 if (java_lang_Class::is_primitive(mirror)) {
1536 return NULL;
1537 }
1538 Klass* klass = java_lang_Class::as_Klass(mirror);
1539 if (!klass->is_instance_klass()) {
1540 return NULL;
1541 }
1542 InstanceKlass* k = InstanceKlass::cast(klass);
1543 int ooff = 0, noff = 0;
1544 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1545 if (noff != 0) {
1546 constantPoolHandle i_cp(thread, k->constants());
1547 Symbol* name = i_cp->symbol_at(noff);
1548 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1549 return (jstring) JNIHandles::make_local(THREAD, str());
1550 }
1551 }
1552 return NULL;
1553 }
1554 JVM_END
1555
1556 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1557 assert (cls != NULL, "illegal class");
1558 JvmtiVMObjectAllocEventCollector oam;
1559 ResourceMark rm(THREAD);
1560 oop mirror = JNIHandles::resolve_non_null(cls);
1561 // Return null for arrays and primitives
1562 if (!java_lang_Class::is_primitive(mirror)) {
1563 Klass* k = java_lang_Class::as_Klass(mirror);
1564 if (k->is_instance_klass()) {
1565 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1566 if (sym == NULL) return NULL;
1567 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1568 return (jstring) JNIHandles::make_local(THREAD, str());
1569 }
1570 }
1571 return NULL;
1572 JVM_END
1573
1574
1575 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1576 assert (cls != NULL, "illegal class");
1577 oop mirror = JNIHandles::resolve_non_null(cls);
1578 // Return null for arrays and primitives
1579 if (!java_lang_Class::is_primitive(mirror)) {
1580 Klass* k = java_lang_Class::as_Klass(mirror);
1581 if (k->is_instance_klass()) {
1582 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1583 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1584 }
1585 }
1586 return NULL;
1587 JVM_END
1588
1589
1590 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1591 // some of this code was adapted from from jni_FromReflectedField
1592
1593 oop reflected = JNIHandles::resolve_non_null(field);
1594 oop mirror = java_lang_reflect_Field::clazz(reflected);
1595 Klass* k = java_lang_Class::as_Klass(mirror);
1596 int slot = java_lang_reflect_Field::slot(reflected);
1597 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1598
1599 InstanceKlass* ik = InstanceKlass::cast(k);
1600 intptr_t offset = ik->field_offset(slot);
1601
1602 if (modifiers & JVM_ACC_STATIC) {
1603 // for static fields we only look in the current class
1604 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1605 assert(false, "cannot find static field");
1606 return false;
1607 }
1608 } else {
1609 // for instance fields we start with the current class and work
1610 // our way up through the superclass chain
1611 if (!ik->find_field_from_offset(offset, false, &fd)) {
1612 assert(false, "cannot find instance field");
1613 return false;
1614 }
1615 }
1616 return true;
1617 }
1618
1619 static Method* jvm_get_method_common(jobject method) {
1620 // some of this code was adapted from from jni_FromReflectedMethod
1621
1622 oop reflected = JNIHandles::resolve_non_null(method);
1623 oop mirror = NULL;
1624 int slot = 0;
1625
1626 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1627 mirror = java_lang_reflect_Constructor::clazz(reflected);
1628 slot = java_lang_reflect_Constructor::slot(reflected);
1629 } else {
1630 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1631 "wrong type");
1632 mirror = java_lang_reflect_Method::clazz(reflected);
1633 slot = java_lang_reflect_Method::slot(reflected);
1634 }
1635 Klass* k = java_lang_Class::as_Klass(mirror);
1636
1637 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1638 assert(m != NULL, "cannot find method");
1639 return m; // caller has to deal with NULL in product mode
1640 }
1641
1642 /* Type use annotations support (JDK 1.8) */
1643
1644 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1645 assert (cls != NULL, "illegal class");
1646 ResourceMark rm(THREAD);
1647 // Return null for arrays and primitives
1648 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1649 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1650 if (k->is_instance_klass()) {
1651 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1652 if (type_annotations != NULL) {
1653 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1654 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1655 }
1656 }
1657 }
1658 return NULL;
1659 JVM_END
1660
1661 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1662 assert (method != NULL, "illegal method");
1663 // method is a handle to a java.lang.reflect.Method object
1664 Method* m = jvm_get_method_common(method);
1665 if (m == NULL) {
1666 return NULL;
1667 }
1668
1669 AnnotationArray* type_annotations = m->type_annotations();
1670 if (type_annotations != NULL) {
1671 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1672 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1673 }
1674
1675 return NULL;
1676 JVM_END
1677
1678 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1679 assert (field != NULL, "illegal field");
1680 fieldDescriptor fd;
1681 bool gotFd = jvm_get_field_common(field, fd);
1682 if (!gotFd) {
1683 return NULL;
1684 }
1685
1686 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1687 JVM_END
1688
1689 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1690 if (!cp->is_within_bounds(index)) {
1691 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1692 }
1693 }
1694
1695 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1696 {
1697 // method is a handle to a java.lang.reflect.Method object
1698 Method* method_ptr = jvm_get_method_common(method);
1699 methodHandle mh (THREAD, method_ptr);
1700 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1701 const int num_params = mh->method_parameters_length();
1702
1703 if (num_params < 0) {
1704 // A -1 return value from method_parameters_length means there is no
1705 // parameter data. Return null to indicate this to the reflection
1706 // API.
1707 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1708 return (jobjectArray)NULL;
1709 } else {
1710 // Otherwise, we return something up to reflection, even if it is
1711 // a zero-length array. Why? Because in some cases this can
1712 // trigger a MalformedParametersException.
1713
1714 // make sure all the symbols are properly formatted
1715 for (int i = 0; i < num_params; i++) {
1716 MethodParametersElement* params = mh->method_parameters_start();
1717 int index = params[i].name_cp_index;
1718 constantPoolHandle cp(THREAD, mh->constants());
1719 bounds_check(cp, index, CHECK_NULL);
1720
1721 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1722 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1723 "Wrong type at constant pool index");
1724 }
1725
1726 }
1727
1728 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1729 objArrayHandle result (THREAD, result_oop);
1730
1731 for (int i = 0; i < num_params; i++) {
1732 MethodParametersElement* params = mh->method_parameters_start();
1733 // For a 0 index, give a NULL symbol
1734 Symbol* sym = 0 != params[i].name_cp_index ?
1735 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1736 int flags = params[i].flags;
1737 oop param = Reflection::new_parameter(reflected_method, i, sym,
1738 flags, CHECK_NULL);
1739 result->obj_at_put(i, param);
1740 }
1741 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1742 }
1743 }
1744 JVM_END
1745
1746 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1747
1748 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1749 {
1750 JvmtiVMObjectAllocEventCollector oam;
1751
1752 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1753 // Exclude primitive types and array types
1754 if (java_lang_Class::is_primitive(ofMirror) ||
1755 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1756 // Return empty array
1757 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1758 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1759 }
1760
1761 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1762 constantPoolHandle cp(THREAD, k->constants());
1763
1764 // Ensure class is linked
1765 k->link_class(CHECK_NULL);
1766
1767 // Allocate result
1768 int num_fields;
1769
1770 if (publicOnly) {
1771 num_fields = 0;
1772 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1773 if (fs.access_flags().is_public()) ++num_fields;
1774 }
1775 } else {
1776 num_fields = k->java_fields_count();
1777 }
1778
1779 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1780 objArrayHandle result (THREAD, r);
1781
1782 int out_idx = 0;
1783 fieldDescriptor fd;
1784 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1785 if (!publicOnly || fs.access_flags().is_public()) {
1786 fd.reinitialize(k, fs.index());
1787 oop field = Reflection::new_field(&fd, CHECK_NULL);
1788 result->obj_at_put(out_idx, field);
1789 ++out_idx;
1790 }
1791 }
1792 assert(out_idx == num_fields, "just checking");
1793 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1794 }
1795 JVM_END
1796
1797 // A class is a record if and only if it is final and a direct subclass of
1798 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1799 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1800 {
1801 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1802 if (k != NULL && k->is_instance_klass()) {
1803 InstanceKlass* ik = InstanceKlass::cast(k);
1804 return ik->is_record();
1805 } else {
1806 return false;
1807 }
1808 }
1809 JVM_END
1810
1811 // Returns an array containing the components of the Record attribute,
1812 // or NULL if the attribute is not present.
1813 //
1814 // Note that this function returns the components of the Record attribute
1815 // even if the class is not a record.
1816 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1817 {
1818 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1819 assert(c->is_instance_klass(), "must be");
1820 InstanceKlass* ik = InstanceKlass::cast(c);
1821
1822 Array<RecordComponent*>* components = ik->record_components();
1823 if (components != NULL) {
1824 JvmtiVMObjectAllocEventCollector oam;
1825 constantPoolHandle cp(THREAD, ik->constants());
1826 int length = components->length();
1827 assert(length >= 0, "unexpected record_components length");
1828 objArrayOop record_components =
1829 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1830 objArrayHandle components_h (THREAD, record_components);
1831
1832 for (int x = 0; x < length; x++) {
1833 RecordComponent* component = components->at(x);
1834 assert(component != NULL, "unexpected NULL record component");
1835 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1836 components_h->obj_at_put(x, component_oop);
1837 }
1838 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1839 }
1840
1841 return NULL;
1842 }
1843 JVM_END
1844
1845 static bool select_method(const methodHandle& method, bool want_constructor) {
1846 if (want_constructor) {
1847 return (method->is_initializer() && !method->is_static());
1848 } else {
1849 return (!method->is_initializer() && !method->is_overpass());
1850 }
1851 }
1852
1853 static jobjectArray get_class_declared_methods_helper(
1854 JNIEnv *env,
1855 jclass ofClass, jboolean publicOnly,
1856 bool want_constructor,
1857 Klass* klass, TRAPS) {
1858
1859 JvmtiVMObjectAllocEventCollector oam;
1860
1861 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1862 // Exclude primitive types and array types
1863 if (java_lang_Class::is_primitive(ofMirror)
1864 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1865 // Return empty array
1866 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1867 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1868 }
1869
1870 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1871
1872 // Ensure class is linked
1873 k->link_class(CHECK_NULL);
1874
1875 Array<Method*>* methods = k->methods();
1876 int methods_length = methods->length();
1877
1878 // Save original method_idnum in case of redefinition, which can change
1879 // the idnum of obsolete methods. The new method will have the same idnum
1880 // but if we refresh the methods array, the counts will be wrong.
1881 ResourceMark rm(THREAD);
1882 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1883 int num_methods = 0;
1884
1885 for (int i = 0; i < methods_length; i++) {
1886 methodHandle method(THREAD, methods->at(i));
1887 if (select_method(method, want_constructor)) {
1888 if (!publicOnly || method->is_public()) {
1889 idnums->push(method->method_idnum());
1890 ++num_methods;
1891 }
1892 }
1893 }
1894
1895 // Allocate result
1896 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1897 objArrayHandle result (THREAD, r);
1898
1899 // Now just put the methods that we selected above, but go by their idnum
1900 // in case of redefinition. The methods can be redefined at any safepoint,
1901 // so above when allocating the oop array and below when creating reflect
1902 // objects.
1903 for (int i = 0; i < num_methods; i++) {
1904 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1905 if (method.is_null()) {
1906 // Method may have been deleted and seems this API can handle null
1907 // Otherwise should probably put a method that throws NSME
1908 result->obj_at_put(i, NULL);
1909 } else {
1910 oop m;
1911 if (want_constructor) {
1912 m = Reflection::new_constructor(method, CHECK_NULL);
1913 } else {
1914 m = Reflection::new_method(method, false, CHECK_NULL);
1915 }
1916 result->obj_at_put(i, m);
1917 }
1918 }
1919
1920 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1921 }
1922
1923 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1924 {
1925 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1926 /*want_constructor*/ false,
1927 vmClasses::reflect_Method_klass(), THREAD);
1928 }
1929 JVM_END
1930
1931 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1932 {
1933 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1934 /*want_constructor*/ true,
1935 vmClasses::reflect_Constructor_klass(), THREAD);
1936 }
1937 JVM_END
1938
1939 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1940 {
1941 oop mirror = JNIHandles::resolve_non_null(cls);
1942 if (java_lang_Class::is_primitive(mirror)) {
1943 // Primitive type
1944 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1945 }
1946
1947 Klass* k = java_lang_Class::as_Klass(mirror);
1948 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1949 }
1950 JVM_END
1951
1952 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1953 {
1954 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1955 assert(c->is_instance_klass(), "must be");
1956 InstanceKlass* ck = InstanceKlass::cast(c);
1957 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1958 assert(m->is_instance_klass(), "must be");
1959 InstanceKlass* mk = InstanceKlass::cast(m);
1960 return ck->has_nestmate_access_to(mk, THREAD);
1961 }
1962 JVM_END
1963
1964 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1965 {
1966 // current is not a primitive or array class
1967 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1968 assert(c->is_instance_klass(), "must be");
1969 InstanceKlass* ck = InstanceKlass::cast(c);
1970 InstanceKlass* host = ck->nest_host(THREAD);
1971 return (jclass) (host == NULL ? NULL :
1972 JNIHandles::make_local(THREAD, host->java_mirror()));
1973 }
1974 JVM_END
1975
1976 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1977 {
1978 // current is not a primitive or array class
1979 ResourceMark rm(THREAD);
1980 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1981 assert(c->is_instance_klass(), "must be");
1982 InstanceKlass* ck = InstanceKlass::cast(c);
1983 InstanceKlass* host = ck->nest_host(THREAD);
1984
1985 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1986 ck->external_name(), host->external_name());
1987 {
1988 JvmtiVMObjectAllocEventCollector oam;
1989 Array<u2>* members = host->nest_members();
1990 int length = members == NULL ? 0 : members->length();
1991
1992 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1993
1994 // nest host is first in the array so make it one bigger
1995 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1996 length + 1, CHECK_NULL);
1997 objArrayHandle result(THREAD, r);
1998 result->obj_at_put(0, host->java_mirror());
1999 if (length != 0) {
2000 int count = 0;
2001 for (int i = 0; i < length; i++) {
2002 int cp_index = members->at(i);
2003 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2004 if (HAS_PENDING_EXCEPTION) {
2005 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2006 return NULL; // propagate VMEs
2007 }
2008 if (log_is_enabled(Trace, class, nestmates)) {
2009 stringStream ss;
2010 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2011 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2012 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2013 log_trace(class, nestmates)("%s", ss.as_string());
2014 }
2015 CLEAR_PENDING_EXCEPTION;
2016 continue;
2017 }
2018 if (k->is_instance_klass()) {
2019 InstanceKlass* ik = InstanceKlass::cast(k);
2020 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2021 if (nest_host_k == host) {
2022 result->obj_at_put(count+1, k->java_mirror());
2023 count++;
2024 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2025 } else {
2026 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2027 ik->external_name(), nest_host_k->external_name());
2028 }
2029 } else {
2030 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2031 k->external_name());
2032 }
2033 }
2034 if (count < length) {
2035 // we had invalid entries so we need to compact the array
2036 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2037 length + 1, count + 1);
2038
2039 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2040 count + 1, CHECK_NULL);
2041 objArrayHandle result2(THREAD, r2);
2042 for (int i = 0; i < count + 1; i++) {
2043 result2->obj_at_put(i, result->obj_at(i));
2044 }
2045 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2046 }
2047 }
2048 else {
2049 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2050 }
2051 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2052 }
2053 }
2054 JVM_END
2055
2056 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2057 {
2058 oop mirror = JNIHandles::resolve_non_null(current);
2059 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2060 Klass* c = java_lang_Class::as_Klass(mirror);
2061 assert(c->is_instance_klass(), "must be");
2062 InstanceKlass* ik = InstanceKlass::cast(c);
2063 ResourceMark rm(THREAD);
2064 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2065 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2066 if (ik->is_sealed()) {
2067 JvmtiVMObjectAllocEventCollector oam;
2068 Array<u2>* subclasses = ik->permitted_subclasses();
2069 int length = subclasses->length();
2070
2071 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2072
2073 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2074 length, CHECK_NULL);
2075 objArrayHandle result(THREAD, r);
2076 int count = 0;
2077 for (int i = 0; i < length; i++) {
2078 int cp_index = subclasses->at(i);
2079 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2080 if (HAS_PENDING_EXCEPTION) {
2081 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2082 return NULL; // propagate VMEs
2083 }
2084 if (log_is_enabled(Trace, class, sealed)) {
2085 stringStream ss;
2086 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2087 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2088 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2089 log_trace(class, sealed)("%s", ss.as_string());
2090 }
2091
2092 CLEAR_PENDING_EXCEPTION;
2093 continue;
2094 }
2095 if (k->is_instance_klass()) {
2096 result->obj_at_put(count++, k->java_mirror());
2097 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2098 }
2099 }
2100 if (count < length) {
2101 // we had invalid entries so we need to compact the array
2102 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2103 count, CHECK_NULL);
2104 objArrayHandle result2(THREAD, r2);
2105 for (int i = 0; i < count; i++) {
2106 result2->obj_at_put(i, result->obj_at(i));
2107 }
2108 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2109 }
2110 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2111 } else {
2112 return NULL;
2113 }
2114 }
2115 JVM_END
2116
2117 // Constant pool access //////////////////////////////////////////////////////////
2118
2119 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2120 {
2121 JvmtiVMObjectAllocEventCollector oam;
2122 oop mirror = JNIHandles::resolve_non_null(cls);
2123 // Return null for primitives and arrays
2124 if (!java_lang_Class::is_primitive(mirror)) {
2125 Klass* k = java_lang_Class::as_Klass(mirror);
2126 if (k->is_instance_klass()) {
2127 InstanceKlass* k_h = InstanceKlass::cast(k);
2128 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2129 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2130 return JNIHandles::make_local(THREAD, jcp());
2131 }
2132 }
2133 return NULL;
2134 }
2135 JVM_END
2136
2137
2138 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2139 {
2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141 return cp->length();
2142 }
2143 JVM_END
2144
2145
2146 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2147 {
2148 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2149 bounds_check(cp, index, CHECK_NULL);
2150 constantTag tag = cp->tag_at(index);
2151 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2152 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2153 }
2154 Klass* k = cp->klass_at(index, CHECK_NULL);
2155 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2156 }
2157 JVM_END
2158
2159 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2160 {
2161 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2162 bounds_check(cp, index, CHECK_NULL);
2163 constantTag tag = cp->tag_at(index);
2164 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2165 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2166 }
2167 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2168 if (k == NULL) return NULL;
2169 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2170 }
2171 JVM_END
2172
2173 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2174 constantTag tag = cp->tag_at(index);
2175 if (!tag.is_method() && !tag.is_interface_method()) {
2176 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2177 }
2178 int klass_ref = cp->uncached_klass_ref_index_at(index);
2179 Klass* k_o;
2180 if (force_resolution) {
2181 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2182 } else {
2183 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2184 if (k_o == NULL) return NULL;
2185 }
2186 InstanceKlass* k = InstanceKlass::cast(k_o);
2187 Symbol* name = cp->uncached_name_ref_at(index);
2188 Symbol* sig = cp->uncached_signature_ref_at(index);
2189 methodHandle m (THREAD, k->find_method(name, sig));
2190 if (m.is_null()) {
2191 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2192 }
2193 oop method;
2194 if (!m->is_initializer() || m->is_static()) {
2195 method = Reflection::new_method(m, true, CHECK_NULL);
2196 } else {
2197 method = Reflection::new_constructor(m, CHECK_NULL);
2198 }
2199 return JNIHandles::make_local(THREAD, method);
2200 }
2201
2202 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2203 {
2204 JvmtiVMObjectAllocEventCollector oam;
2205 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2206 bounds_check(cp, index, CHECK_NULL);
2207 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2208 return res;
2209 }
2210 JVM_END
2211
2212 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2213 {
2214 JvmtiVMObjectAllocEventCollector oam;
2215 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2216 bounds_check(cp, index, CHECK_NULL);
2217 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2218 return res;
2219 }
2220 JVM_END
2221
2222 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2223 constantTag tag = cp->tag_at(index);
2224 if (!tag.is_field()) {
2225 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2226 }
2227 int klass_ref = cp->uncached_klass_ref_index_at(index);
2228 Klass* k_o;
2229 if (force_resolution) {
2230 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2231 } else {
2232 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2233 if (k_o == NULL) return NULL;
2234 }
2235 InstanceKlass* k = InstanceKlass::cast(k_o);
2236 Symbol* name = cp->uncached_name_ref_at(index);
2237 Symbol* sig = cp->uncached_signature_ref_at(index);
2238 fieldDescriptor fd;
2239 Klass* target_klass = k->find_field(name, sig, &fd);
2240 if (target_klass == NULL) {
2241 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2242 }
2243 oop field = Reflection::new_field(&fd, CHECK_NULL);
2244 return JNIHandles::make_local(THREAD, field);
2245 }
2246
2247 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2248 {
2249 JvmtiVMObjectAllocEventCollector oam;
2250 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2251 bounds_check(cp, index, CHECK_NULL);
2252 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2253 return res;
2254 }
2255 JVM_END
2256
2257 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2258 {
2259 JvmtiVMObjectAllocEventCollector oam;
2260 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2261 bounds_check(cp, index, CHECK_NULL);
2262 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2263 return res;
2264 }
2265 JVM_END
2266
2267 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2268 {
2269 JvmtiVMObjectAllocEventCollector oam;
2270 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2271 bounds_check(cp, index, CHECK_NULL);
2272 constantTag tag = cp->tag_at(index);
2273 if (!tag.is_field_or_method()) {
2274 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2275 }
2276 int klass_ref = cp->uncached_klass_ref_index_at(index);
2277 Symbol* klass_name = cp->klass_name_at(klass_ref);
2278 Symbol* member_name = cp->uncached_name_ref_at(index);
2279 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2280 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2281 objArrayHandle dest(THREAD, dest_o);
2282 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2283 dest->obj_at_put(0, str());
2284 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2285 dest->obj_at_put(1, str());
2286 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2287 dest->obj_at_put(2, str());
2288 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2289 }
2290 JVM_END
2291
2292 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2293 {
2294 JvmtiVMObjectAllocEventCollector oam;
2295 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2296 bounds_check(cp, index, CHECK_0);
2297 constantTag tag = cp->tag_at(index);
2298 if (!tag.is_field_or_method()) {
2299 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2300 }
2301 return (jint) cp->uncached_klass_ref_index_at(index);
2302 }
2303 JVM_END
2304
2305 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2306 {
2307 JvmtiVMObjectAllocEventCollector oam;
2308 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2309 bounds_check(cp, index, CHECK_0);
2310 constantTag tag = cp->tag_at(index);
2311 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2312 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2313 }
2314 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2315 }
2316 JVM_END
2317
2318 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2319 {
2320 JvmtiVMObjectAllocEventCollector oam;
2321 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2322 bounds_check(cp, index, CHECK_NULL);
2323 constantTag tag = cp->tag_at(index);
2324 if (!tag.is_name_and_type()) {
2325 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2326 }
2327 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2328 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2329 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2330 objArrayHandle dest(THREAD, dest_o);
2331 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2332 dest->obj_at_put(0, str());
2333 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2334 dest->obj_at_put(1, str());
2335 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2336 }
2337 JVM_END
2338
2339 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2340 {
2341 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2342 bounds_check(cp, index, CHECK_0);
2343 constantTag tag = cp->tag_at(index);
2344 if (!tag.is_int()) {
2345 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2346 }
2347 return cp->int_at(index);
2348 }
2349 JVM_END
2350
2351 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2352 {
2353 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2354 bounds_check(cp, index, CHECK_(0L));
2355 constantTag tag = cp->tag_at(index);
2356 if (!tag.is_long()) {
2357 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2358 }
2359 return cp->long_at(index);
2360 }
2361 JVM_END
2362
2363 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2364 {
2365 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2366 bounds_check(cp, index, CHECK_(0.0f));
2367 constantTag tag = cp->tag_at(index);
2368 if (!tag.is_float()) {
2369 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2370 }
2371 return cp->float_at(index);
2372 }
2373 JVM_END
2374
2375 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2376 {
2377 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2378 bounds_check(cp, index, CHECK_(0.0));
2379 constantTag tag = cp->tag_at(index);
2380 if (!tag.is_double()) {
2381 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2382 }
2383 return cp->double_at(index);
2384 }
2385 JVM_END
2386
2387 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2388 {
2389 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2390 bounds_check(cp, index, CHECK_NULL);
2391 constantTag tag = cp->tag_at(index);
2392 if (!tag.is_string()) {
2393 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2394 }
2395 oop str = cp->string_at(index, CHECK_NULL);
2396 return (jstring) JNIHandles::make_local(THREAD, str);
2397 }
2398 JVM_END
2399
2400 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2401 {
2402 JvmtiVMObjectAllocEventCollector oam;
2403 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2404 bounds_check(cp, index, CHECK_NULL);
2405 constantTag tag = cp->tag_at(index);
2406 if (!tag.is_symbol()) {
2407 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2408 }
2409 Symbol* sym = cp->symbol_at(index);
2410 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2411 return (jstring) JNIHandles::make_local(THREAD, str());
2412 }
2413 JVM_END
2414
2415 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2416 {
2417 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2418 bounds_check(cp, index, CHECK_0);
2419 constantTag tag = cp->tag_at(index);
2420 jbyte result = tag.value();
2421 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2422 // they are changed to the corresponding tags from the JVM spec, so that java code in
2423 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2424 if (tag.is_klass_or_reference()) {
2425 result = JVM_CONSTANT_Class;
2426 } else if (tag.is_string_index()) {
2427 result = JVM_CONSTANT_String;
2428 } else if (tag.is_method_type_in_error()) {
2429 result = JVM_CONSTANT_MethodType;
2430 } else if (tag.is_method_handle_in_error()) {
2431 result = JVM_CONSTANT_MethodHandle;
2432 } else if (tag.is_dynamic_constant_in_error()) {
2433 result = JVM_CONSTANT_Dynamic;
2434 }
2435 return result;
2436 }
2437 JVM_END
2438
2439 // Assertion support. //////////////////////////////////////////////////////////
2440
2441 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2442 assert(cls != NULL, "bad class");
2443
2444 oop r = JNIHandles::resolve(cls);
2445 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2446 if (java_lang_Class::is_primitive(r)) return false;
2447
2448 Klass* k = java_lang_Class::as_Klass(r);
2449 assert(k->is_instance_klass(), "must be an instance klass");
2450 if (!k->is_instance_klass()) return false;
2451
2452 ResourceMark rm(THREAD);
2453 const char* name = k->name()->as_C_string();
2454 bool system_class = k->class_loader() == NULL;
2455 return JavaAssertions::enabled(name, system_class);
2456
2457 JVM_END
2458
2459
2460 // Return a new AssertionStatusDirectives object with the fields filled in with
2461 // command-line assertion arguments (i.e., -ea, -da).
2462 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2463 JvmtiVMObjectAllocEventCollector oam;
2464 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2465 return JNIHandles::make_local(THREAD, asd);
2466 JVM_END
2467
2468 // Verification ////////////////////////////////////////////////////////////////////////////////
2469
2470 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2471
2472 // RedefineClasses support: bug 6214132 caused verification to fail.
2473 // All functions from this section should call the jvmtiThreadSate function:
2474 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2475 // The function returns a Klass* of the _scratch_class if the verifier
2476 // was invoked in the middle of the class redefinition.
2477 // Otherwise it returns its argument value which is the _the_class Klass*.
2478 // Please, refer to the description in the jvmtiThreadSate.hpp.
2479
2480 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2481 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2482 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2483 return k->name()->as_utf8();
2484 JVM_END
2485
2486
2487 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2489 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2490 // types will have length zero if this is not an InstanceKlass
2491 // (length is determined by call to JVM_GetClassCPEntriesCount)
2492 if (k->is_instance_klass()) {
2493 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2494 for (int index = cp->length() - 1; index >= 0; index--) {
2495 constantTag tag = cp->tag_at(index);
2496 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2497 }
2498 }
2499 JVM_END
2500
2501
2502 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2504 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2505 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2506 JVM_END
2507
2508
2509 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2511 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2512 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2513 JVM_END
2514
2515
2516 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2518 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2519 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2520 JVM_END
2521
2522
2523 // The following methods, used for the verifier, are never called with
2524 // array klasses, so a direct cast to InstanceKlass is safe.
2525 // Typically, these methods are called in a loop with bounds determined
2526 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2527 // zero for arrays.
2528 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2529 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2531 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2532 int length = method->checked_exceptions_length();
2533 if (length > 0) {
2534 CheckedExceptionElement* table= method->checked_exceptions_start();
2535 for (int i = 0; i < length; i++) {
2536 exceptions[i] = table[i].class_cp_index;
2537 }
2538 }
2539 JVM_END
2540
2541
2542 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2546 return method->checked_exceptions_length();
2547 JVM_END
2548
2549
2550 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2552 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2553 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2554 memcpy(code, method->code_base(), method->code_size());
2555 JVM_END
2556
2557
2558 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2562 return method->code_size();
2563 JVM_END
2564
2565
2566 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2568 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2569 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2570 ExceptionTable extable(method);
2571 entry->start_pc = extable.start_pc(entry_index);
2572 entry->end_pc = extable.end_pc(entry_index);
2573 entry->handler_pc = extable.handler_pc(entry_index);
2574 entry->catchType = extable.catch_type_index(entry_index);
2575 JVM_END
2576
2577
2578 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2582 return method->exception_table_length();
2583 JVM_END
2584
2585
2586 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2587 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2588 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2589 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2590 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2591 JVM_END
2592
2593
2594 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2595 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2596 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2597 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2598 JVM_END
2599
2600
2601 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2605 return method->max_locals();
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2612 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2613 return method->size_of_parameters();
2614 JVM_END
2615
2616
2617 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2619 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2620 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2621 return method->verifier_max_stack();
2622 JVM_END
2623
2624
2625 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2626 ResourceMark rm(THREAD);
2627 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2628 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2629 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2630 return method->name() == vmSymbols::object_initializer_name();
2631 JVM_END
2632
2633
2634 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2635 ResourceMark rm(THREAD);
2636 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2637 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2638 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2639 return method->is_overpass();
2640 JVM_END
2641
2642 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2643 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2644 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2645 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2646 return method->name()->as_utf8();
2647 JVM_END
2648
2649
2650 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2651 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2652 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2653 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2654 return method->signature()->as_utf8();
2655 JVM_END
2656
2657 /**
2658 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2659 * read entries in the constant pool. Since the old verifier always
2660 * works on a copy of the code, it will not see any rewriting that
2661 * may possibly occur in the middle of verification. So it is important
2662 * that nothing it calls tries to use the cpCache instead of the raw
2663 * constant pool, so we must use cp->uncached_x methods when appropriate.
2664 */
2665 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_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 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2669 switch (cp->tag_at(cp_index).value()) {
2670 case JVM_CONSTANT_Fieldref:
2671 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2672 default:
2673 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2674 }
2675 ShouldNotReachHere();
2676 return NULL;
2677 JVM_END
2678
2679
2680 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_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 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2684 switch (cp->tag_at(cp_index).value()) {
2685 case JVM_CONSTANT_InterfaceMethodref:
2686 case JVM_CONSTANT_Methodref:
2687 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2688 default:
2689 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2690 }
2691 ShouldNotReachHere();
2692 return NULL;
2693 JVM_END
2694
2695
2696 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_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 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2700 switch (cp->tag_at(cp_index).value()) {
2701 case JVM_CONSTANT_InterfaceMethodref:
2702 case JVM_CONSTANT_Methodref:
2703 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2704 default:
2705 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2706 }
2707 ShouldNotReachHere();
2708 return NULL;
2709 JVM_END
2710
2711
2712 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2713 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2714 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2715 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2716 switch (cp->tag_at(cp_index).value()) {
2717 case JVM_CONSTANT_Fieldref:
2718 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2719 default:
2720 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2721 }
2722 ShouldNotReachHere();
2723 return NULL;
2724 JVM_END
2725
2726
2727 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2728 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2729 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2730 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2731 Symbol* classname = cp->klass_name_at(cp_index);
2732 return classname->as_utf8();
2733 JVM_END
2734
2735
2736 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2737 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2738 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2739 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2740 switch (cp->tag_at(cp_index).value()) {
2741 case JVM_CONSTANT_Fieldref: {
2742 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2743 Symbol* classname = cp->klass_name_at(class_index);
2744 return classname->as_utf8();
2745 }
2746 default:
2747 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2748 }
2749 ShouldNotReachHere();
2750 return NULL;
2751 JVM_END
2752
2753
2754 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2755 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2756 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2757 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2758 switch (cp->tag_at(cp_index).value()) {
2759 case JVM_CONSTANT_Methodref:
2760 case JVM_CONSTANT_InterfaceMethodref: {
2761 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2762 Symbol* classname = cp->klass_name_at(class_index);
2763 return classname->as_utf8();
2764 }
2765 default:
2766 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2767 }
2768 ShouldNotReachHere();
2769 return NULL;
2770 JVM_END
2771
2772
2773 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2774 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2775 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2776 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2777 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2778 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2779 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2780 switch (cp->tag_at(cp_index).value()) {
2781 case JVM_CONSTANT_Fieldref: {
2782 Symbol* name = cp->uncached_name_ref_at(cp_index);
2783 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2784 InstanceKlass* ik = InstanceKlass::cast(k_called);
2785 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2786 if (fs.name() == name && fs.signature() == signature) {
2787 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2788 }
2789 }
2790 return -1;
2791 }
2792 default:
2793 fatal("JVM_GetCPFieldModifiers: illegal constant");
2794 }
2795 ShouldNotReachHere();
2796 return 0;
2797 JVM_END
2798
2799
2800 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2801 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2802 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2803 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2804 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2805 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2806 switch (cp->tag_at(cp_index).value()) {
2807 case JVM_CONSTANT_Methodref:
2808 case JVM_CONSTANT_InterfaceMethodref: {
2809 Symbol* name = cp->uncached_name_ref_at(cp_index);
2810 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2811 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2812 int methods_count = methods->length();
2813 for (int i = 0; i < methods_count; i++) {
2814 Method* method = methods->at(i);
2815 if (method->name() == name && method->signature() == signature) {
2816 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2817 }
2818 }
2819 return -1;
2820 }
2821 default:
2822 fatal("JVM_GetCPMethodModifiers: illegal constant");
2823 }
2824 ShouldNotReachHere();
2825 return 0;
2826 JVM_END
2827
2828
2829 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2830
2831 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2832 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2833 JVM_END
2834
2835
2836 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2837 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2838 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2839 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2840 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2841 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2842 JVM_END
2843
2844 // Printing support //////////////////////////////////////////////////
2845 extern "C" {
2846
2847 ATTRIBUTE_PRINTF(3, 0)
2848 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2849 // Reject count values that are negative signed values converted to
2850 // unsigned; see bug 4399518, 4417214
2851 if ((intptr_t)count <= 0) return -1;
2852
2853 int result = os::vsnprintf(str, count, fmt, args);
2854 if (result > 0 && (size_t)result >= count) {
2855 result = -1;
2856 }
2857
2858 return result;
2859 }
2860
2861 ATTRIBUTE_PRINTF(3, 4)
2862 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2863 va_list args;
2864 int len;
2865 va_start(args, fmt);
2866 len = jio_vsnprintf(str, count, fmt, args);
2867 va_end(args);
2868 return len;
2869 }
2870
2871 ATTRIBUTE_PRINTF(2, 3)
2872 int jio_fprintf(FILE* f, const char *fmt, ...) {
2873 int len;
2874 va_list args;
2875 va_start(args, fmt);
2876 len = jio_vfprintf(f, fmt, args);
2877 va_end(args);
2878 return len;
2879 }
2880
2881 ATTRIBUTE_PRINTF(2, 0)
2882 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2883 if (Arguments::vfprintf_hook() != NULL) {
2884 return Arguments::vfprintf_hook()(f, fmt, args);
2885 } else {
2886 return vfprintf(f, fmt, args);
2887 }
2888 }
2889
2890 ATTRIBUTE_PRINTF(1, 2)
2891 JNIEXPORT int jio_printf(const char *fmt, ...) {
2892 int len;
2893 va_list args;
2894 va_start(args, fmt);
2895 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2896 va_end(args);
2897 return len;
2898 }
2899
2900 // HotSpot specific jio method
2901 void jio_print(const char* s, size_t len) {
2902 // Try to make this function as atomic as possible.
2903 if (Arguments::vfprintf_hook() != NULL) {
2904 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2905 } else {
2906 // Make an unused local variable to avoid warning from gcc compiler.
2907 ssize_t count = os::write(defaultStream::output_fd(), s, (int)len);
2908 }
2909 }
2910
2911 } // Extern C
2912
2913 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2914
2915 // In most of the JVM thread support functions we need to access the
2916 // thread through a ThreadsListHandle to prevent it from exiting and
2917 // being reclaimed while we try to operate on it. The exceptions to this
2918 // rule are when operating on the current thread, or if the monitor of
2919 // the target java.lang.Thread is locked at the Java level - in both
2920 // cases the target cannot exit.
2921
2922 static void thread_entry(JavaThread* thread, TRAPS) {
2923 HandleMark hm(THREAD);
2924 Handle obj(THREAD, thread->threadObj());
2925 JavaValue result(T_VOID);
2926 JavaCalls::call_virtual(&result,
2927 obj,
2928 vmClasses::Thread_klass(),
2929 vmSymbols::run_method_name(),
2930 vmSymbols::void_method_signature(),
2931 THREAD);
2932 }
2933
2934
2935 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2936 #if INCLUDE_CDS
2937 if (DumpSharedSpaces) {
2938 // During java -Xshare:dump, if we allow multiple Java threads to
2939 // execute in parallel, symbols and classes may be loaded in
2940 // random orders which will make the resulting CDS archive
2941 // non-deterministic.
2942 //
2943 // Lucikly, during java -Xshare:dump, it's important to run only
2944 // the code in the main Java thread (which is NOT started here) that
2945 // creates the module graph, etc. It's safe to not start the other
2946 // threads which are launched by class static initializers
2947 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2948 if (log_is_enabled(Info, cds)) {
2949 ResourceMark rm;
2950 oop t = JNIHandles::resolve_non_null(jthread);
2951 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2952 }
2953 return;
2954 }
2955 #endif
2956 JavaThread *native_thread = NULL;
2957
2958 // We cannot hold the Threads_lock when we throw an exception,
2959 // due to rank ordering issues. Example: we might need to grab the
2960 // Heap_lock while we construct the exception.
2961 bool throw_illegal_thread_state = false;
2962
2963 // We must release the Threads_lock before we can post a jvmti event
2964 // in Thread::start.
2965 {
2966 // Ensure that the C++ Thread and OSThread structures aren't freed before
2967 // we operate.
2968 MutexLocker mu(Threads_lock);
2969
2970 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2971 // re-starting an already started thread, so we should usually find
2972 // that the JavaThread is null. However for a JNI attached thread
2973 // there is a small window between the Thread object being created
2974 // (with its JavaThread set) and the update to its threadStatus, so we
2975 // have to check for this
2976 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2977 throw_illegal_thread_state = true;
2978 } else {
2979 jlong size =
2980 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2981 // Allocate the C++ Thread structure and create the native thread. The
2982 // stack size retrieved from java is 64-bit signed, but the constructor takes
2983 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2984 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2985 // - Avoid passing negative values which would result in really large stacks.
2986 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2987 size_t sz = size > 0 ? (size_t) size : 0;
2988 native_thread = new JavaThread(&thread_entry, sz);
2989
2990 // At this point it may be possible that no osthread was created for the
2991 // JavaThread due to lack of memory. Check for this situation and throw
2992 // an exception if necessary. Eventually we may want to change this so
2993 // that we only grab the lock if the thread was created successfully -
2994 // then we can also do this check and throw the exception in the
2995 // JavaThread constructor.
2996 if (native_thread->osthread() != NULL) {
2997 // Note: the current thread is not being used within "prepare".
2998 native_thread->prepare(jthread);
2999 }
3000 }
3001 }
3002
3003 if (throw_illegal_thread_state) {
3004 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3005 }
3006
3007 assert(native_thread != NULL, "Starting null thread?");
3008
3009 if (native_thread->osthread() == NULL) {
3010 ResourceMark rm(thread);
3011 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3012 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3013 // No one should hold a reference to the 'native_thread'.
3014 native_thread->smr_delete();
3015 if (JvmtiExport::should_post_resource_exhausted()) {
3016 JvmtiExport::post_resource_exhausted(
3017 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3018 os::native_thread_creation_failed_msg());
3019 }
3020 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3021 os::native_thread_creation_failed_msg());
3022 }
3023
3024 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3025
3026 Thread::start(native_thread);
3027
3028 JVM_END
3029
3030
3031 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3032 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3033 return java_lang_Thread::is_alive(thread_oop);
3034 JVM_END
3035
3036
3037 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3038 ThreadsListHandle tlh(thread);
3039 oop java_thread = NULL;
3040 JavaThread* receiver = NULL;
3041 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3042 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3043
3044 if (is_alive) {
3045 // jthread refers to a live JavaThread.
3046 Thread::set_priority(receiver, (ThreadPriority)prio);
3047 }
3048 // Implied else: If the JavaThread hasn't started yet, then the
3049 // priority set in the java.lang.Thread object above will be pushed
3050 // down when it does start.
3051 JVM_END
3052
3053
3054 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3055 if (os::dont_yield()) return;
3056 HOTSPOT_THREAD_YIELD();
3057 os::naked_yield();
3058 JVM_END
3059
3060 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3061 if (millis < 0) {
3062 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3063 }
3064
3065 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3066 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3067 }
3068
3069 // Save current thread state and restore it at the end of this block.
3070 // And set new thread state to SLEEPING.
3071 JavaThreadSleepState jtss(thread);
3072
3073 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3074
3075 if (millis == 0) {
3076 os::naked_yield();
3077 } else {
3078 ThreadState old_state = thread->osthread()->get_state();
3079 thread->osthread()->set_state(SLEEPING);
3080 if (!thread->sleep(millis)) { // interrupted
3081 // An asynchronous exception could have been thrown on
3082 // us while we were sleeping. We do not overwrite those.
3083 if (!HAS_PENDING_EXCEPTION) {
3084 HOTSPOT_THREAD_SLEEP_END(1);
3085
3086 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3087 // to properly restore the thread state. That's likely wrong.
3088 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3089 }
3090 }
3091 thread->osthread()->set_state(old_state);
3092 }
3093 HOTSPOT_THREAD_SLEEP_END(0);
3094 JVM_END
3095
3096 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3097 oop jthread = thread->threadObj();
3098 assert(jthread != NULL, "no current carrier thread!");
3099 return JNIHandles::make_local(THREAD, jthread);
3100 JVM_END
3101
3102 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3103 oop theThread = thread->vthread();
3104 assert(theThread != (oop)NULL, "no current thread!");
3105 return JNIHandles::make_local(THREAD, theThread);
3106 JVM_END
3107
3108 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3109 jobject theThread))
3110 oop threadObj = JNIHandles::resolve(theThread);
3111 thread->set_vthread(threadObj);
3112 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3113 JVM_END
3114
3115 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3116 return ThreadIdentifier::unsafe_offset();
3117 JVM_END
3118
3119 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3120 ThreadsListHandle tlh(thread);
3121 JavaThread* receiver = NULL;
3122 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3123 if (is_alive) {
3124 // jthread refers to a live JavaThread.
3125 receiver->interrupt();
3126 }
3127 JVM_END
3128
3129 // Return true iff the current thread has locked the object passed in
3130
3131 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3132 if (obj == NULL) {
3133 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3134 }
3135 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3136 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3137 JVM_END
3138
3139 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3140 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3141 return JNIHandles::make_local(THREAD, trace);
3142 JVM_END
3143
3144 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3145 VM_PrintThreads op;
3146 VMThread::execute(&op);
3147 if (JvmtiExport::should_post_data_dump()) {
3148 JvmtiExport::post_data_dump();
3149 }
3150 JVM_END
3151
3152 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3153 // We don't use a ThreadsListHandle here because the current thread
3154 // must be alive.
3155 oop java_thread = JNIHandles::resolve_non_null(jthread);
3156 JavaThread* thr = java_lang_Thread::thread(java_thread);
3157 if (thread == thr && !thr->has_attached_via_jni()) {
3158 // Thread naming is only supported for the current thread and
3159 // we don't set the name of an attached thread to avoid stepping
3160 // on other programs.
3161 ResourceMark rm(thread);
3162 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3163 os::set_native_thread_name(thread_name);
3164 }
3165 JVM_END
3166
3167 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3168 oop theCache = thread->scopedValueCache();
3169 return JNIHandles::make_local(THREAD, theCache);
3170 JVM_END
3171
3172 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3173 jobject theCache))
3174 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3175 thread->set_scopedValueCache(objs);
3176 JVM_END
3177
3178 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3179
3180 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3181 ResourceMark rm(THREAD);
3182 JvmtiVMObjectAllocEventCollector oam;
3183 vframeStream vfst(thread);
3184
3185 if (vmClasses::reflect_CallerSensitive_klass() != NULL) {
3186 // This must only be called from SecurityManager.getClassContext
3187 Method* m = vfst.method();
3188 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3189 m->name() == vmSymbols::getClassContext_name() &&
3190 m->signature() == vmSymbols::void_class_array_signature())) {
3191 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3192 }
3193 }
3194
3195 // Collect method holders
3196 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3197 for (; !vfst.at_end(); vfst.security_next()) {
3198 Method* m = vfst.method();
3199 // Native frames are not returned
3200 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3201 Klass* holder = m->method_holder();
3202 assert(holder->is_klass(), "just checking");
3203 klass_array->append(holder);
3204 }
3205 }
3206
3207 // Create result array of type [Ljava/lang/Class;
3208 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3209 // Fill in mirrors corresponding to method holders
3210 for (int i = 0; i < klass_array->length(); i++) {
3211 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3212 }
3213
3214 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3215 JVM_END
3216
3217
3218 // java.lang.Package ////////////////////////////////////////////////////////////////
3219
3220
3221 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3222 ResourceMark rm(THREAD);
3223 JvmtiVMObjectAllocEventCollector oam;
3224 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3225 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3226 return (jstring) JNIHandles::make_local(THREAD, result);
3227 JVM_END
3228
3229
3230 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3231 JvmtiVMObjectAllocEventCollector oam;
3232 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3233 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3234 JVM_END
3235
3236
3237 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3238
3239
3240 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3241 MonitorLocker ml(Heap_lock);
3242 oop ref = Universe::reference_pending_list();
3243 if (ref != NULL) {
3244 Universe::clear_reference_pending_list();
3245 }
3246 return JNIHandles::make_local(THREAD, ref);
3247 JVM_END
3248
3249 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3250 MonitorLocker ml(Heap_lock);
3251 return Universe::has_reference_pending_list();
3252 JVM_END
3253
3254 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3255 MonitorLocker ml(Heap_lock);
3256 while (!Universe::has_reference_pending_list()) {
3257 ml.wait();
3258 }
3259 JVM_END
3260
3261 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3262 oop ref_oop = JNIHandles::resolve_non_null(ref);
3263 // PhantomReference has it's own implementation of refersTo().
3264 // See: JVM_PhantomReferenceRefersTo
3265 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3266 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3267 return referent == JNIHandles::resolve(o);
3268 JVM_END
3269
3270 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3271 oop ref_oop = JNIHandles::resolve_non_null(ref);
3272 // FinalReference has it's own implementation of clear().
3273 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3274 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == NULL) {
3275 // If the referent has already been cleared then done.
3276 // However, if the referent is dead but has not yet been cleared by
3277 // concurrent reference processing, it should NOT be cleared here.
3278 // Instead, clearing should be left to the GC. Clearing it here could
3279 // detectably lose an expected notification, which is impossible with
3280 // STW reference processing. The clearing in enqueue() doesn't have
3281 // this problem, since the enqueue covers the notification, but it's not
3282 // worth the effort to handle that case specially.
3283 return;
3284 }
3285 java_lang_ref_Reference::clear_referent(ref_oop);
3286 JVM_END
3287
3288
3289 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3290
3291
3292 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3293 oop ref_oop = JNIHandles::resolve_non_null(ref);
3294 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3295 return referent == JNIHandles::resolve(o);
3296 JVM_END
3297
3298
3299 // ObjectInputStream ///////////////////////////////////////////////////////////////
3300
3301 // Return the first user-defined class loader up the execution stack, or null
3302 // if only code from the bootstrap or platform class loader is on the stack.
3303
3304 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3305 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3306 InstanceKlass* ik = vfst.method()->method_holder();
3307 oop loader = ik->class_loader();
3308 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3309 // Skip reflection related frames
3310 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3311 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3312 return JNIHandles::make_local(THREAD, loader);
3313 }
3314 }
3315 }
3316 return NULL;
3317 JVM_END
3318
3319
3320 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3321
3322
3323 // resolve array handle and check arguments
3324 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3325 if (arr == NULL) {
3326 THROW_0(vmSymbols::java_lang_NullPointerException());
3327 }
3328 oop a = JNIHandles::resolve_non_null(arr);
3329 if (!a->is_array()) {
3330 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3331 } else if (type_array_only && !a->is_typeArray()) {
3332 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3333 }
3334 return arrayOop(a);
3335 }
3336
3337
3338 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3339 arrayOop a = check_array(env, arr, false, CHECK_0);
3340 return a->length();
3341 JVM_END
3342
3343
3344 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3345 JvmtiVMObjectAllocEventCollector oam;
3346 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3347 jvalue value;
3348 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3349 oop box = Reflection::box(&value, type, CHECK_NULL);
3350 return JNIHandles::make_local(THREAD, box);
3351 JVM_END
3352
3353
3354 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3355 jvalue value;
3356 value.i = 0; // to initialize value before getting used in CHECK
3357 arrayOop a = check_array(env, arr, true, CHECK_(value));
3358 assert(a->is_typeArray(), "just checking");
3359 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3360 BasicType wide_type = (BasicType) wCode;
3361 if (type != wide_type) {
3362 Reflection::widen(&value, type, wide_type, CHECK_(value));
3363 }
3364 return value;
3365 JVM_END
3366
3367
3368 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3369 arrayOop a = check_array(env, arr, false, CHECK);
3370 oop box = JNIHandles::resolve(val);
3371 jvalue value;
3372 value.i = 0; // to initialize value before getting used in CHECK
3373 BasicType value_type;
3374 if (a->is_objArray()) {
3375 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3376 value_type = Reflection::unbox_for_regular_object(box, &value);
3377 } else {
3378 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3379 }
3380 Reflection::array_set(&value, a, index, value_type, CHECK);
3381 JVM_END
3382
3383
3384 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3385 arrayOop a = check_array(env, arr, true, CHECK);
3386 assert(a->is_typeArray(), "just checking");
3387 BasicType value_type = (BasicType) vCode;
3388 Reflection::array_set(&v, a, index, value_type, CHECK);
3389 JVM_END
3390
3391
3392 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3393 JvmtiVMObjectAllocEventCollector oam;
3394 oop element_mirror = JNIHandles::resolve(eltClass);
3395 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3396 return JNIHandles::make_local(THREAD, result);
3397 JVM_END
3398
3399
3400 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3401 JvmtiVMObjectAllocEventCollector oam;
3402 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3403 oop element_mirror = JNIHandles::resolve(eltClass);
3404 assert(dim_array->is_typeArray(), "just checking");
3405 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3406 return JNIHandles::make_local(THREAD, result);
3407 JVM_END
3408
3409
3410 // Library support ///////////////////////////////////////////////////////////////////////////
3411
3412 JVM_LEAF(void*, JVM_LoadZipLibrary())
3413 ClassLoader::load_zip_library_if_needed();
3414 return ClassLoader::zip_library_handle();
3415 JVM_END
3416
3417 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3418 //%note jvm_ct
3419 char ebuf[1024];
3420 void *load_result;
3421 {
3422 ThreadToNativeFromVM ttnfvm(thread);
3423 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3424 }
3425 if (load_result == NULL) {
3426 if (throwException) {
3427 char msg[1024];
3428 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3429 // Since 'ebuf' may contain a string encoded using
3430 // platform encoding scheme, we need to pass
3431 // Exceptions::unsafe_to_utf8 to the new_exception method
3432 // as the last argument. See bug 6367357.
3433 Handle h_exception =
3434 Exceptions::new_exception(thread,
3435 vmSymbols::java_lang_UnsatisfiedLinkError(),
3436 msg, Exceptions::unsafe_to_utf8);
3437
3438 THROW_HANDLE_0(h_exception);
3439 } else {
3440 log_info(library)("Failed to load library %s", name);
3441 return load_result;
3442 }
3443 }
3444 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3445 return load_result;
3446 JVM_END
3447
3448
3449 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3450 os::dll_unload(handle);
3451 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3452 JVM_END
3453
3454
3455 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3456 void* find_result = os::dll_lookup(handle, name);
3457 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3458 find_result != NULL ? "Found" : "Failed to find",
3459 name, p2i(handle));
3460 return find_result;
3461 JVM_END
3462
3463
3464 // JNI version ///////////////////////////////////////////////////////////////////////////////
3465
3466 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3467 return Threads::is_supported_jni_version_including_1_1(version);
3468 JVM_END
3469
3470
3471 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3472 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3473 JVM_END
3474
3475 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3476 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3477 JVM_END
3478
3479 // String support ///////////////////////////////////////////////////////////////////////////
3480
3481 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3482 JvmtiVMObjectAllocEventCollector oam;
3483 if (str == NULL) return NULL;
3484 oop string = JNIHandles::resolve_non_null(str);
3485 oop result = StringTable::intern(string, CHECK_NULL);
3486 return (jstring) JNIHandles::make_local(THREAD, result);
3487 JVM_END
3488
3489
3490 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3491
3492 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3493 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3494 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3495 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3496 // nature. JavaThreads will be "in native" when using this API from JDK code.
3497
3498
3499 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3500 VM_Exit::block_if_vm_exited();
3501 return new PlatformMutex();
3502 }
3503
3504
3505 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3506 VM_Exit::block_if_vm_exited();
3507 delete ((PlatformMutex*) mon);
3508 }
3509
3510
3511 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3512 VM_Exit::block_if_vm_exited();
3513 ((PlatformMutex*) mon)->lock();
3514 return 0;
3515 }
3516
3517
3518 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3519 VM_Exit::block_if_vm_exited();
3520 ((PlatformMutex*) mon)->unlock();
3521 }
3522
3523
3524 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3525
3526 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3527 Handle loader, Handle protection_domain,
3528 jboolean throwError, TRAPS) {
3529 // Security Note:
3530 // The Java level wrapper will perform the necessary security check allowing
3531 // us to pass the NULL as the initiating class loader. The VM is responsible for
3532 // the checkPackageAccess relative to the initiating class loader via the
3533 // protection_domain. The protection_domain is passed as NULL by the java code
3534 // if there is no security manager in 3-arg Class.forName().
3535 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3536
3537 // Check if we should initialize the class
3538 if (init && klass->is_instance_klass()) {
3539 klass->initialize(CHECK_NULL);
3540 }
3541 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3542 }
3543
3544
3545 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3546
3547 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3548 Handle method_handle;
3549 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3550 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3551 Handle receiver(THREAD, JNIHandles::resolve(obj));
3552 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3553 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3554 jobject res = JNIHandles::make_local(THREAD, result);
3555 if (JvmtiExport::should_post_vm_object_alloc()) {
3556 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3557 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3558 if (java_lang_Class::is_primitive(ret_type)) {
3559 // Only for primitive type vm allocates memory for java object.
3560 // See box() method.
3561 JvmtiExport::post_vm_object_alloc(thread, result);
3562 }
3563 }
3564 return res;
3565 } else {
3566 THROW_0(vmSymbols::java_lang_StackOverflowError());
3567 }
3568 JVM_END
3569
3570
3571 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3572 oop constructor_mirror = JNIHandles::resolve(c);
3573 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3574 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3575 jobject res = JNIHandles::make_local(THREAD, result);
3576 if (JvmtiExport::should_post_vm_object_alloc()) {
3577 JvmtiExport::post_vm_object_alloc(thread, result);
3578 }
3579 return res;
3580 JVM_END
3581
3582 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3583
3584 JVM_LEAF(jboolean, JVM_SupportsCX8())
3585 return VM_Version::supports_cx8();
3586 JVM_END
3587
3588 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3590 assert(k->is_klass(), "just checking");
3591 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3592 JVM_END
3593
3594 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3595 jclass caller,
3596 jstring interfaceMethodName,
3597 jobject factoryType,
3598 jobject interfaceMethodType,
3599 jobject implementationMember,
3600 jobject dynamicMethodType,
3601 jclass lambdaProxyClass))
3602 #if INCLUDE_CDS
3603 if (!Arguments::is_dumping_archive()) {
3604 return;
3605 }
3606
3607 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3608 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3609 if (caller_ik->is_hidden()) {
3610 // Hidden classes not of type lambda proxy classes are currently not being archived.
3611 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3612 // registered for archiving.
3613 return;
3614 }
3615 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3616 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3617 assert(lambda_ik->is_hidden(), "must be a hidden class");
3618 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3619
3620 Symbol* interface_method_name = NULL;
3621 if (interfaceMethodName != NULL) {
3622 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3623 }
3624 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3625 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3626
3627 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3628 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3629
3630 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3631 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3632 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3633
3634 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3635 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3636
3637 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3638 interface_method_type, m, dynamic_method_type, THREAD);
3639 #endif // INCLUDE_CDS
3640 JVM_END
3641
3642 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3643 jclass caller,
3644 jstring interfaceMethodName,
3645 jobject factoryType,
3646 jobject interfaceMethodType,
3647 jobject implementationMember,
3648 jobject dynamicMethodType))
3649 #if INCLUDE_CDS
3650
3651 if (interfaceMethodName == NULL || factoryType == NULL || interfaceMethodType == NULL ||
3652 implementationMember == NULL || dynamicMethodType == NULL) {
3653 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3654 }
3655
3656 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3657 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3658 if (!caller_ik->is_shared()) {
3659 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3660 return NULL;
3661 }
3662
3663 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3664 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3665 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3666
3667 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3668 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3669
3670 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3671 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3672 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3673
3674 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3675 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3676
3677 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3678 interface_method_type, m, dynamic_method_type);
3679 jclass jcls = NULL;
3680 if (lambda_ik != NULL) {
3681 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3682 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3683 }
3684 return jcls;
3685 #else
3686 return NULL;
3687 #endif // INCLUDE_CDS
3688 JVM_END
3689
3690 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3691 return Arguments::is_dumping_archive();
3692 JVM_END
3693
3694 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3695 return UseSharedSpaces;
3696 JVM_END
3697
3698 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3699 if (DumpSharedSpaces) {
3700 const char* release = VM_Version::vm_release();
3701 const char* dbg_level = VM_Version::jdk_debug_level();
3702 const char* version = VM_Version::internal_vm_info_string();
3703 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3704 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3705 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3706 seed += (jlong)VM_Version::vm_major_version();
3707 seed += (jlong)VM_Version::vm_minor_version();
3708 seed += (jlong)VM_Version::vm_security_version();
3709 seed += (jlong)VM_Version::vm_patch_version();
3710 if (seed == 0) { // don't let this ever be zero.
3711 seed = 0x87654321;
3712 }
3713 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3714 return seed;
3715 } else {
3716 return 0;
3717 }
3718 JVM_END
3719
3720 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3721 #if INCLUDE_CDS
3722 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3723 #else
3724 return false;
3725 #endif // INCLUDE_CDS
3726 JVM_END
3727
3728 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3729 #if INCLUDE_CDS
3730 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3731 if (line != NULL) {
3732 ResourceMark rm(THREAD);
3733 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3734 char* c_line = java_lang_String::as_utf8_string(h_line());
3735 if (DynamicDumpSharedSpaces) {
3736 // Note: LambdaFormInvokers::append take same format which is not
3737 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3738 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3739 }
3740 if (ClassListWriter::is_enabled()) {
3741 ClassListWriter w;
3742 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3743 }
3744 }
3745 #endif // INCLUDE_CDS
3746 JVM_END
3747
3748 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3749 #if INCLUDE_CDS
3750 ResourceMark rm(THREAD);
3751 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3752 char* file_name = java_lang_String::as_utf8_string(file_handle());
3753 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3754 #endif // INCLUDE_CDS
3755 JVM_END
3756
3757 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3758 #if INCLUDE_CDS
3759 ResourceMark rm(THREAD);
3760 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3761 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3762 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3763 #endif // INCLUDE_CDS
3764 JVM_END
3765
3766 // Returns an array of all live Thread objects (VM internal JavaThreads,
3767 // jvmti agent threads, and JNI attaching threads are skipped)
3768 // See CR 6404306 regarding JNI attaching threads
3769 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3770 ResourceMark rm(THREAD);
3771 ThreadsListEnumerator tle(THREAD, false, false);
3772 JvmtiVMObjectAllocEventCollector oam;
3773
3774 int num_threads = tle.num_threads();
3775 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3776 objArrayHandle threads_ah(THREAD, r);
3777
3778 for (int i = 0; i < num_threads; i++) {
3779 Handle h = tle.get_threadObj(i);
3780 threads_ah->obj_at_put(i, h());
3781 }
3782
3783 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3784 JVM_END
3785
3786
3787 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3788 // Return StackTraceElement[][], each element is the stack trace of a thread in
3789 // the corresponding entry in the given threads array
3790 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3791 JvmtiVMObjectAllocEventCollector oam;
3792
3793 // Check if threads is null
3794 if (threads == NULL) {
3795 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3796 }
3797
3798 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3799 objArrayHandle ah(THREAD, a);
3800 int num_threads = ah->length();
3801 // check if threads is non-empty array
3802 if (num_threads == 0) {
3803 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3804 }
3805
3806 // check if threads is not an array of objects of Thread class
3807 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3808 if (k != vmClasses::Thread_klass()) {
3809 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3810 }
3811
3812 ResourceMark rm(THREAD);
3813
3814 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3815 for (int i = 0; i < num_threads; i++) {
3816 oop thread_obj = ah->obj_at(i);
3817 instanceHandle h(THREAD, (instanceOop) thread_obj);
3818 thread_handle_array->append(h);
3819 }
3820
3821 // The JavaThread references in thread_handle_array are validated
3822 // in VM_ThreadDump::doit().
3823 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3824 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3825
3826 JVM_END
3827
3828 // JVM monitoring and management support
3829 JVM_LEAF(void*, JVM_GetManagement(jint version))
3830 return Management::get_jmm_interface(version);
3831 JVM_END
3832
3833 // com.sun.tools.attach.VirtualMachine agent properties support
3834 //
3835 // Initialize the agent properties with the properties maintained in the VM
3836 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3837 ResourceMark rm;
3838
3839 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3840
3841 PUTPROP(props, "sun.java.command", Arguments::java_command());
3842 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3843 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3844 return properties;
3845 JVM_END
3846
3847 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3848 {
3849 JvmtiVMObjectAllocEventCollector oam;
3850
3851 if (ofClass == NULL) {
3852 return NULL;
3853 }
3854 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3855 // Special handling for primitive objects
3856 if (java_lang_Class::is_primitive(mirror())) {
3857 return NULL;
3858 }
3859 Klass* k = java_lang_Class::as_Klass(mirror());
3860 if (!k->is_instance_klass()) {
3861 return NULL;
3862 }
3863 InstanceKlass* ik = InstanceKlass::cast(k);
3864 int encl_method_class_idx = ik->enclosing_method_class_index();
3865 if (encl_method_class_idx == 0) {
3866 return NULL;
3867 }
3868 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3869 objArrayHandle dest(THREAD, dest_o);
3870 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3871 dest->obj_at_put(0, enc_k->java_mirror());
3872 int encl_method_method_idx = ik->enclosing_method_method_index();
3873 if (encl_method_method_idx != 0) {
3874 Symbol* sym = ik->constants()->symbol_at(
3875 extract_low_short_from_int(
3876 ik->constants()->name_and_type_at(encl_method_method_idx)));
3877 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3878 dest->obj_at_put(1, str());
3879 sym = ik->constants()->symbol_at(
3880 extract_high_short_from_int(
3881 ik->constants()->name_and_type_at(encl_method_method_idx)));
3882 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3883 dest->obj_at_put(2, str());
3884 }
3885 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3886 }
3887 JVM_END
3888
3889 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3890 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3891 ResourceMark rm(THREAD);
3892
3893 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3894 return NULL;
3895 }
3896
3897 char** vm_flags = Arguments::jvm_flags_array();
3898 char** vm_args = Arguments::jvm_args_array();
3899 int num_flags = Arguments::num_jvm_flags();
3900 int num_args = Arguments::num_jvm_args();
3901
3902 InstanceKlass* ik = vmClasses::String_klass();
3903 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3904 objArrayHandle result_h(THREAD, r);
3905
3906 int index = 0;
3907 for (int j = 0; j < num_flags; j++, index++) {
3908 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3909 result_h->obj_at_put(index, h());
3910 }
3911 for (int i = 0; i < num_args; i++, index++) {
3912 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3913 result_h->obj_at_put(index, h());
3914 }
3915 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3916 JVM_END
3917
3918 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3919 return os::get_signal_number(name);
3920 JVM_END
3921
3922 JVM_ENTRY(void, JVM_VirtualThreadMountBegin(JNIEnv* env, jobject vthread, jboolean first_mount))
3923 #if INCLUDE_JVMTI
3924 if (!DoJVMTIVirtualThreadTransitions) {
3925 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3926 return;
3927 }
3928 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
3929 assert(!thread->is_in_VTMS_transition(), "sanity check");
3930 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ true);
3931 #else
3932 fatal("Should only be called with JVMTI enabled");
3933 #endif
3934 JVM_END
3935
3936 JVM_ENTRY(void, JVM_VirtualThreadMountEnd(JNIEnv* env, jobject vthread, jboolean first_mount))
3937 #if INCLUDE_JVMTI
3938 if (!DoJVMTIVirtualThreadTransitions) {
3939 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3940 return;
3941 }
3942 oop vt = JNIHandles::resolve(vthread);
3943
3944 thread->rebind_to_jvmti_thread_state_of(vt);
3945
3946 {
3947 MutexLocker mu(JvmtiThreadState_lock);
3948 JvmtiThreadState* state = thread->jvmti_thread_state();
3949 if (state != NULL && state->is_pending_interp_only_mode()) {
3950 JvmtiEventController::enter_interp_only_mode();
3951 }
3952 }
3953 assert(thread->is_in_VTMS_transition(), "sanity check");
3954 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
3955 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ true);
3956 if (first_mount) {
3957 // thread start
3958 if (JvmtiExport::can_support_virtual_threads()) {
3959 JvmtiEventController::thread_started(thread);
3960 if (JvmtiExport::should_post_vthread_start()) {
3961 JvmtiExport::post_vthread_start(vthread);
3962 }
3963 } else { // compatibility for vthread unaware agents: legacy thread_start
3964 if (PostVirtualThreadCompatibleLifecycleEvents &&
3965 JvmtiExport::should_post_thread_life()) {
3966 // JvmtiEventController::thread_started is called here
3967 JvmtiExport::post_thread_start(thread);
3968 }
3969 }
3970 }
3971 if (JvmtiExport::should_post_vthread_mount()) {
3972 JvmtiExport::post_vthread_mount(vthread);
3973 }
3974 #else
3975 fatal("Should only be called with JVMTI enabled");
3976 #endif
3977 JVM_END
3978
3979 JVM_ENTRY(void, JVM_VirtualThreadUnmountBegin(JNIEnv* env, jobject vthread, jboolean last_unmount))
3980 #if INCLUDE_JVMTI
3981 if (!DoJVMTIVirtualThreadTransitions) {
3982 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3983 return;
3984 }
3985 HandleMark hm(thread);
3986 Handle ct(thread, thread->threadObj());
3987
3988 if (JvmtiExport::should_post_vthread_unmount()) {
3989 JvmtiExport::post_vthread_unmount(vthread);
3990 }
3991 if (last_unmount) {
3992 if (JvmtiExport::can_support_virtual_threads()) {
3993 if (JvmtiExport::should_post_vthread_end()) {
3994 JvmtiExport::post_vthread_end(vthread);
3995 }
3996 } else { // compatibility for vthread unaware agents: legacy thread_end
3997 if (PostVirtualThreadCompatibleLifecycleEvents &&
3998 JvmtiExport::should_post_thread_life()) {
3999 JvmtiExport::post_thread_end(thread);
4000 }
4001 }
4002 }
4003 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
4004 assert(!thread->is_in_VTMS_transition(), "sanity check");
4005 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ false);
4006
4007 if (last_unmount && thread->jvmti_thread_state() != NULL) {
4008 JvmtiExport::cleanup_thread(thread);
4009 thread->set_jvmti_thread_state(NULL);
4010 oop vt = JNIHandles::resolve(vthread);
4011 java_lang_Thread::set_jvmti_thread_state(vt, NULL);
4012 }
4013 thread->rebind_to_jvmti_thread_state_of(ct());
4014 #else
4015 fatal("Should only be called with JVMTI enabled");
4016 #endif
4017 JVM_END
4018
4019 JVM_ENTRY(void, JVM_VirtualThreadUnmountEnd(JNIEnv* env, jobject vthread, jboolean last_unmount))
4020 #if INCLUDE_JVMTI
4021 if (!DoJVMTIVirtualThreadTransitions) {
4022 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4023 return;
4024 }
4025 assert(thread->is_in_VTMS_transition(), "sanity check");
4026 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
4027 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ false);
4028 #else
4029 fatal("Should only be called with JVMTI enabled");
4030 #endif
4031 JVM_END
4032
4033 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
4034 #if INCLUDE_JVMTI
4035 if (!DoJVMTIVirtualThreadTransitions) {
4036 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4037 return;
4038 }
4039 assert(!thread->is_in_VTMS_transition(), "sanity check");
4040 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
4041 thread->toggle_is_in_tmp_VTMS_transition();
4042 #else
4043 fatal("Should only be called with JVMTI enabled");
4044 #endif
4045 JVM_END
4046
4047 /*
4048 * Return the current class's class file version. The low order 16 bits of the
4049 * returned jint contain the class's major version. The high order 16 bits
4050 * contain the class's minor version.
4051 */
4052 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4053 oop mirror = JNIHandles::resolve_non_null(current);
4054 if (java_lang_Class::is_primitive(mirror)) {
4055 // return latest major version and minor version of 0.
4056 return JVM_CLASSFILE_MAJOR_VERSION;
4057 }
4058 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4059
4060 Klass* c = java_lang_Class::as_Klass(mirror);
4061 assert(c->is_instance_klass(), "must be");
4062 InstanceKlass* ik = InstanceKlass::cast(c);
4063 return (ik->minor_version() << 16) | ik->major_version();
4064 JVM_END
4065
4066 /*
4067 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4068 * get the value will see a materialized value and not a scalar-replaced
4069 * null value.
4070 */
4071 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4072 JVM_EnsureMaterializedForStackWalk(env, value);
4073 JVM_END