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 "jvm.h"
27 #include "cds/classListParser.hpp"
28 #include "cds/classListWriter.hpp"
29 #include "cds/dynamicArchive.hpp"
30 #include "cds/heapShared.hpp"
31 #include "cds/lambdaFormInvokers.hpp"
32 #include "classfile/classFileStream.hpp"
33 #include "classfile/classLoader.inline.hpp"
34 #include "classfile/classLoaderData.hpp"
35 #include "classfile/classLoaderData.inline.hpp"
36 #include "classfile/classLoadInfo.hpp"
37 #include "classfile/javaAssertions.hpp"
38 #include "classfile/javaClasses.inline.hpp"
39 #include "classfile/moduleEntry.hpp"
40 #include "classfile/modules.hpp"
41 #include "classfile/packageEntry.hpp"
42 #include "classfile/stringTable.hpp"
43 #include "classfile/symbolTable.hpp"
44 #include "classfile/systemDictionary.hpp"
45 #include "classfile/vmClasses.hpp"
46 #include "classfile/vmSymbols.hpp"
47 #include "gc/shared/collectedHeap.inline.hpp"
48 #include "interpreter/bytecode.hpp"
49 #include "interpreter/bytecodeUtils.hpp"
50 #include "jfr/jfrEvents.hpp"
51 #include "logging/log.hpp"
52 #include "memory/oopFactory.hpp"
53 #include "memory/referenceType.hpp"
54 #include "memory/resourceArea.hpp"
55 #include "memory/universe.hpp"
56 #include "oops/access.inline.hpp"
57 #include "oops/constantPool.hpp"
58 #include "oops/fieldStreams.inline.hpp"
59 #include "oops/flatArrayKlass.hpp"
60 #include "oops/instanceKlass.hpp"
61 #include "oops/klass.inline.hpp"
62 #include "oops/method.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "prims/jvm_misc.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiThreadState.inline.hpp"
70 #include "prims/stackwalk.hpp"
71 #include "runtime/arguments.hpp"
72 #include "runtime/atomic.hpp"
73 #include "runtime/continuation.hpp"
74 #include "runtime/globals_extension.hpp"
75 #include "runtime/handles.inline.hpp"
76 #include "runtime/init.hpp"
77 #include "runtime/interfaceSupport.inline.hpp"
78 #include "runtime/deoptimization.hpp"
79 #include "runtime/handshake.hpp"
80 #include "runtime/java.hpp"
81 #include "runtime/javaCalls.hpp"
82 #include "runtime/javaThread.hpp"
83 #include "runtime/jfieldIDWorkaround.hpp"
84 #include "runtime/jniHandles.inline.hpp"
85 #include "runtime/os.inline.hpp"
86 #include "runtime/osThread.hpp"
87 #include "runtime/perfData.hpp"
88 #include "runtime/reflection.hpp"
89 #include "runtime/synchronizer.hpp"
90 #include "runtime/threadIdentifier.hpp"
91 #include "runtime/threadSMR.hpp"
92 #include "runtime/vframe.inline.hpp"
93 #include "runtime/vmOperations.hpp"
94 #include "runtime/vm_version.hpp"
95 #include "services/attachListener.hpp"
96 #include "services/management.hpp"
97 #include "services/threadService.hpp"
98 #include "utilities/copy.hpp"
99 #include "utilities/defaultStream.hpp"
100 #include "utilities/dtrace.hpp"
101 #include "utilities/events.hpp"
102 #include "utilities/macros.hpp"
103 #include "utilities/utf8.hpp"
104 #if INCLUDE_CDS
105 #include "classfile/systemDictionaryShared.hpp"
106 #endif
107 #if INCLUDE_JFR
108 #include "jfr/jfr.hpp"
109 #endif
110 #if INCLUDE_MANAGEMENT
111 #include "services/finalizerService.hpp"
112 #endif
113
114 #include <errno.h>
115
116 /*
117 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
118 such ctors and calls MUST NOT come between an oop declaration/init and its
119 usage because if objects are move this may cause various memory stomps, bus
120 errors and segfaults. Here is a cookbook for causing so called "naked oop
121 failures":
122
123 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
124 // Object address to be held directly in mirror & not visible to GC
125 oop mirror = JNIHandles::resolve_non_null(ofClass);
126
127 // If this ctor can hit a safepoint, moving objects around, then
128 ComplexConstructor foo;
129
130 // Boom! mirror may point to JUNK instead of the intended object
131 (some dereference of mirror)
132
133 // Here's another call that may block for GC, making mirror stale
134 MutexLocker ml(some_lock);
135
136 // And here's an initializer that can result in a stale oop
137 // all in one step.
138 oop o = call_that_can_throw_exception(TRAPS);
139
140
141 The solution is to keep the oop declaration BELOW the ctor or function
142 call that might cause a GC, do another resolve to reassign the oop, or
143 consider use of a Handle instead of an oop so there is immunity from object
144 motion. But note that the "QUICK" entries below do not have a handlemark
145 and thus can only support use of handles passed in.
146 */
147
148 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
149 ResourceMark rm;
150 int line_number = -1;
151 const char * source_file = NULL;
152 const char * trace = "explicit";
153 InstanceKlass* caller = NULL;
154 JavaThread* jthread = THREAD;
155 if (jthread->has_last_Java_frame()) {
156 vframeStream vfst(jthread);
157
158 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
159 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
160 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
161 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
162 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
163
164 Method* last_caller = NULL;
165
166 while (!vfst.at_end()) {
167 Method* m = vfst.method();
168 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
169 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
170 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
171 break;
172 }
173 last_caller = m;
174 vfst.next();
175 }
176 // if this is called from Class.forName0 and that is called from Class.forName,
177 // then print the caller of Class.forName. If this is Class.loadClass, then print
178 // that caller, otherwise keep quiet since this should be picked up elsewhere.
179 bool found_it = false;
180 if (!vfst.at_end() &&
181 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
182 vfst.method()->name() == vmSymbols::forName0_name()) {
183 vfst.next();
184 if (!vfst.at_end() &&
185 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
186 vfst.method()->name() == vmSymbols::forName_name()) {
187 vfst.next();
188 found_it = true;
189 }
190 } else if (last_caller != NULL &&
191 last_caller->method_holder()->name() ==
192 vmSymbols::java_lang_ClassLoader() &&
193 last_caller->name() == vmSymbols::loadClass_name()) {
194 found_it = true;
195 } else if (!vfst.at_end()) {
196 if (vfst.method()->is_native()) {
197 // JNI call
198 found_it = true;
199 }
200 }
201 if (found_it && !vfst.at_end()) {
202 // found the caller
203 caller = vfst.method()->method_holder();
204 line_number = vfst.method()->line_number_from_bci(vfst.bci());
205 if (line_number == -1) {
206 // show method name if it's a native method
207 trace = vfst.method()->name_and_sig_as_C_string();
208 }
209 Symbol* s = caller->source_file_name();
210 if (s != NULL) {
211 source_file = s->as_C_string();
212 }
213 }
214 }
215 if (caller != NULL) {
216 if (to_class != caller) {
217 const char * from = caller->external_name();
218 const char * to = to_class->external_name();
219 // print in a single call to reduce interleaving between threads
220 if (source_file != NULL) {
221 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
222 } else {
223 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
224 }
225 }
226 }
227 }
228
229 void trace_class_resolution(Klass* to_class) {
230 EXCEPTION_MARK;
231 trace_class_resolution_impl(to_class, THREAD);
232 if (HAS_PENDING_EXCEPTION) {
233 CLEAR_PENDING_EXCEPTION;
234 }
235 }
236
237 // java.lang.System //////////////////////////////////////////////////////////////////////
238
239
240 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
241 return os::javaTimeMillis();
242 JVM_END
243
244 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
245 return os::javaTimeNanos();
246 JVM_END
247
248 // The function below is actually exposed by jdk.internal.misc.VM and not
249 // java.lang.System, but we choose to keep it here so that it stays next
250 // to JVM_CurrentTimeMillis and JVM_NanoTime
251
252 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
253 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
254
255 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
256 jlong seconds;
257 jlong nanos;
258
259 os::javaTimeSystemUTC(seconds, nanos);
260
261 // We're going to verify that the result can fit in a long.
262 // For that we need the difference in seconds between 'seconds'
263 // and 'offset_secs' to be such that:
264 // |seconds - offset_secs| < (2^63/10^9)
265 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
266 // which makes |seconds - offset_secs| < 2^33
267 // and we will prefer +/- 2^32 as the maximum acceptable diff
268 // as 2^32 has a more natural feel than 2^33...
269 //
270 // So if |seconds - offset_secs| >= 2^32 - we return a special
271 // sentinel value (-1) which the caller should take as an
272 // exception value indicating that the offset given to us is
273 // too far from range of the current time - leading to too big
274 // a nano adjustment. The caller is expected to recover by
275 // computing a more accurate offset and calling this method
276 // again. (For the record 2^32 secs is ~136 years, so that
277 // should rarely happen)
278 //
279 jlong diff = seconds - offset_secs;
280 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
281 return -1; // sentinel value: the offset is too far off the target
282 }
283
284 // return the adjustment. If you compute a time by adding
285 // this number of nanoseconds along with the number of seconds
286 // in the offset you should get the current UTC time.
287 return (diff * (jlong)1000000000) + nanos;
288 JVM_END
289
290 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
291 jobject dst, jint dst_pos, jint length))
292 // Check if we have null pointers
293 if (src == NULL || dst == NULL) {
294 THROW(vmSymbols::java_lang_NullPointerException());
295 }
296 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
297 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
298 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
299 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
300 // Do copy
301 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
302 JVM_END
303
304
305 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
306 JavaValue r(T_OBJECT);
307 // public synchronized Object put(Object key, Object value);
308 HandleMark hm(THREAD);
309 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
310 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
311 JavaCalls::call_virtual(&r,
312 props,
313 vmClasses::Properties_klass(),
314 vmSymbols::put_name(),
315 vmSymbols::object_object_object_signature(),
316 key_str,
317 value_str,
318 THREAD);
319 }
320
321
322 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
323
324 /*
325 * Return all of the system properties in a Java String array with alternating
326 * names and values from the jvm SystemProperty.
327 * Which includes some internal and all commandline -D defined properties.
328 */
329 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
330 ResourceMark rm(THREAD);
331 HandleMark hm(THREAD);
332 int ndx = 0;
333 int fixedCount = 2;
334
335 SystemProperty* p = Arguments::system_properties();
336 int count = Arguments::PropertyList_count(p);
337
338 // Allocate result String array
339 InstanceKlass* ik = vmClasses::String_klass();
340 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
341 objArrayHandle result_h(THREAD, r);
342
343 while (p != NULL) {
344 const char * key = p->key();
345 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
346 const char * value = p->value();
347 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
348 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
349 result_h->obj_at_put(ndx * 2, key_str());
350 result_h->obj_at_put(ndx * 2 + 1, value_str());
351 ndx++;
352 }
353 p = p->next();
354 }
355
356 // Convert the -XX:MaxDirectMemorySize= command line flag
357 // to the sun.nio.MaxDirectMemorySize property.
358 // Do this after setting user properties to prevent people
359 // from setting the value with a -D option, as requested.
360 // Leave empty if not supplied
361 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
362 char as_chars[256];
363 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
364 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
365 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
366 result_h->obj_at_put(ndx * 2, key_str());
367 result_h->obj_at_put(ndx * 2 + 1, value_str());
368 ndx++;
369 }
370
371 // JVM monitoring and management support
372 // Add the sun.management.compiler property for the compiler's name
373 {
374 #undef CSIZE
375 #if defined(_LP64) || defined(_WIN64)
376 #define CSIZE "64-Bit "
377 #else
378 #define CSIZE
379 #endif // 64bit
380
381 #if COMPILER1_AND_COMPILER2
382 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
383 #else
384 #if defined(COMPILER1)
385 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
386 #elif defined(COMPILER2)
387 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
388 #elif INCLUDE_JVMCI
389 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
390 #else
391 const char* compiler_name = "";
392 #endif // compilers
393 #endif // COMPILER1_AND_COMPILER2
394
395 if (*compiler_name != '\0' &&
396 (Arguments::mode() != Arguments::_int)) {
397 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
398 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
399 result_h->obj_at_put(ndx * 2, key_str());
400 result_h->obj_at_put(ndx * 2 + 1, value_str());
401 ndx++;
402 }
403 }
404
405 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
406 JVM_END
407
408
409 /*
410 * Return the temporary directory that the VM uses for the attach
411 * and perf data files.
412 *
413 * It is important that this directory is well-known and the
414 * same for all VM instances. It cannot be affected by configuration
415 * variables such as java.io.tmpdir.
416 */
417 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
418 HandleMark hm(THREAD);
419 const char* temp_dir = os::get_temp_directory();
420 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
421 return (jstring) JNIHandles::make_local(THREAD, h());
422 JVM_END
423
424
425 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
426
427 extern volatile jint vm_created;
428
429 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
430 #if INCLUDE_CDS
431 // Link all classes for dynamic CDS dumping before vm exit.
432 if (DynamicArchive::should_dump_at_vm_exit()) {
433 DynamicArchive::prepare_for_dump_at_exit();
434 }
435 #endif
436 EventShutdown event;
437 if (event.should_commit()) {
438 event.set_reason("Shutdown requested from Java");
439 event.commit();
440 }
441 JVM_END
442
443
444 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
445 before_exit(thread, true);
446 vm_exit(code);
447 JVM_END
448
449
450 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
451 if (!DisableExplicitGC) {
452 EventSystemGC event;
453 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
454 Universe::heap()->collect(GCCause::_java_lang_system_gc);
455 event.commit();
456 }
457 JVM_END
458
459
460 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
461 return Universe::heap()->millis_since_last_whole_heap_examined();
462 JVM_END
463
464
465 static inline jlong convert_size_t_to_jlong(size_t val) {
466 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
467 NOT_LP64 (return (jlong)val;)
468 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
469 }
470
471 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
472 size_t n = Universe::heap()->capacity();
473 return convert_size_t_to_jlong(n);
474 JVM_END
475
476
477 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
478 size_t n = Universe::heap()->unused();
479 return convert_size_t_to_jlong(n);
480 JVM_END
481
482
483 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
484 size_t n = Universe::heap()->max_capacity();
485 return convert_size_t_to_jlong(n);
486 JVM_END
487
488
489 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
490 return os::active_processor_count();
491 JVM_END
492
493 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
494 #ifdef LINUX
495 if (UseContainerSupport) {
496 return JNI_TRUE;
497 }
498 #endif
499 return JNI_FALSE;
500 JVM_END
501
502 // java.lang.Throwable //////////////////////////////////////////////////////
503
504 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
505 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
506 java_lang_Throwable::fill_in_stack_trace(exception);
507 JVM_END
508
509 // java.lang.NullPointerException ///////////////////////////////////////////
510
511 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
512 if (!ShowCodeDetailsInExceptionMessages) return NULL;
513
514 oop exc = JNIHandles::resolve_non_null(throwable);
515
516 Method* method;
517 int bci;
518 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
519 return NULL;
520 }
521 if (method->is_native()) {
522 return NULL;
523 }
524
525 stringStream ss;
526 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
527 if (ok) {
528 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
529 return (jstring) JNIHandles::make_local(THREAD, result);
530 } else {
531 return NULL;
532 }
533 JVM_END
534
535 // java.lang.StackTraceElement //////////////////////////////////////////////
536
537
538 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
539 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
540 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
541 objArrayHandle stack_trace(THREAD, st);
542 // Fill in the allocated stack trace
543 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
544 JVM_END
545
546
547 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
548 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
549 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
550 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
551 JVM_END
552
553
554 // java.lang.StackWalker //////////////////////////////////////////////////////
555
556
557 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
558 jint skip_frames, jobject contScope, jobject cont,
559 jint frame_count, jint start_index, jobjectArray frames))
560 if (!thread->has_last_Java_frame()) {
561 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
562 }
563
564 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
565 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
566 Handle cont_h(THREAD, JNIHandles::resolve(cont));
567 // frames array is a Class<?>[] array when only getting caller reference,
568 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
569 // be null.
570 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
571 objArrayHandle frames_array_h(THREAD, fa);
572
573 int limit = start_index + frame_count;
574 if (frames_array_h->length() < limit) {
575 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
576 }
577
578 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
579 frame_count, start_index, frames_array_h, CHECK_NULL);
580 return JNIHandles::make_local(THREAD, result);
581 JVM_END
582
583
584 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
585 jint frame_count, jint start_index,
586 jobjectArray frames))
587 // frames array is a Class<?>[] array when only getting caller reference,
588 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
589 // be null.
590 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
591 objArrayHandle frames_array_h(THREAD, fa);
592
593 int limit = start_index+frame_count;
594 if (frames_array_h->length() < limit) {
595 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
596 }
597
598 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
599 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
600 start_index, frames_array_h, THREAD);
601 JVM_END
602
603 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
604 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
605 objArrayHandle frames_array_h(THREAD, fa);
606 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
607 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
608
609 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
610 JVM_END
611
612 // java.lang.Object ///////////////////////////////////////////////
613
614
615 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
616 // as implemented in the classic virtual machine; return 0 if object is NULL
617 if (handle == NULL) {
618 return 0;
619 }
620 oop obj = JNIHandles::resolve_non_null(handle);
621 if (EnableValhalla && obj->klass()->is_inline_klass()) {
622 JavaValue result(T_INT);
623 JavaCallArguments args;
624 Handle ho(THREAD, obj);
625 args.push_oop(ho);
626 methodHandle method(THREAD, Universe::primitive_type_hash_code_method());
627 JavaCalls::call(&result, method, &args, THREAD);
628 if (HAS_PENDING_EXCEPTION) {
629 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
630 Handle e(THREAD, PENDING_EXCEPTION);
631 CLEAR_PENDING_EXCEPTION;
632 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
633 }
634 }
635 return result.get_jint();
636 } else {
637 return ObjectSynchronizer::FastHashCode(THREAD, obj);
638 }
639 JVM_END
640
641
642 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
643 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
644 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
645 if (JvmtiExport::should_post_monitor_wait()) {
646 JvmtiExport::post_monitor_wait(thread, obj(), ms);
647
648 // The current thread already owns the monitor and it has not yet
649 // been added to the wait queue so the current thread cannot be
650 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
651 // event handler cannot accidentally consume an unpark() meant for
652 // the ParkEvent associated with this ObjectMonitor.
653 }
654 ObjectSynchronizer::wait(obj, ms, CHECK);
655 JVM_END
656
657
658 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
659 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
660 ObjectSynchronizer::notify(obj, CHECK);
661 JVM_END
662
663
664 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
665 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
666 ObjectSynchronizer::notifyall(obj, CHECK);
667 JVM_END
668
669
670 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
671 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
672 Klass* klass = obj->klass();
673 JvmtiVMObjectAllocEventCollector oam;
674
675 #ifdef ASSERT
676 // Just checking that the cloneable flag is set correct
677 if (obj->is_array()) {
678 guarantee(klass->is_cloneable(), "all arrays are cloneable");
679 } else {
680 guarantee(obj->is_instance(), "should be instanceOop");
681 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
682 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
683 }
684 #endif
685
686 // Check if class of obj supports the Cloneable interface.
687 // All arrays are considered to be cloneable (See JLS 20.1.5).
688 // All j.l.r.Reference classes are considered non-cloneable.
689 if (!klass->is_cloneable() ||
690 klass->is_inline_klass() ||
691 (klass->is_instance_klass() &&
692 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
693 ResourceMark rm(THREAD);
694 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
695 }
696
697 // Make shallow object copy
698 const size_t size = obj->size();
699 oop new_obj_oop = NULL;
700 if (obj->is_array()) {
701 const int length = ((arrayOop)obj())->length();
702 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
703 /* do_zero */ true, CHECK_NULL);
704 } else {
705 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
706 }
707
708 HeapAccess<>::clone(obj(), new_obj_oop, size);
709
710 Handle new_obj(THREAD, new_obj_oop);
711 // Caution: this involves a java upcall, so the clone should be
712 // "gc-robust" by this stage.
713 if (klass->has_finalizer()) {
714 assert(obj->is_instance(), "should be instanceOop");
715 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
716 new_obj = Handle(THREAD, new_obj_oop);
717 }
718
719 return JNIHandles::make_local(THREAD, new_obj());
720 JVM_END
721
722 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
723
724 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
725 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
726 JVM_END
727
728 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
729 return InstanceKlass::is_finalization_enabled();
730 JVM_END
731
732 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
733
734 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
735 CONT_RegisterNativeMethods(env, cls);
736 JVM_END
737
738 // java.io.File ///////////////////////////////////////////////////////////////
739
740 JVM_LEAF(char*, JVM_NativePath(char* path))
741 return os::native_path(path);
742 JVM_END
743
744
745 // Misc. class handling ///////////////////////////////////////////////////////////
746
747
748 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
749 // Getting the class of the caller frame.
750 //
751 // The call stack at this point looks something like this:
752 //
753 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
754 // [1] [ @CallerSensitive API.method ]
755 // [.] [ (skipped intermediate frames) ]
756 // [n] [ caller ]
757 vframeStream vfst(thread);
758 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
759 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
760 Method* m = vfst.method();
761 assert(m != NULL, "sanity");
762 switch (n) {
763 case 0:
764 // This must only be called from Reflection.getCallerClass
765 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
766 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
767 }
768 // fall-through
769 case 1:
770 // Frame 0 and 1 must be caller sensitive.
771 if (!m->caller_sensitive()) {
772 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
773 }
774 break;
775 default:
776 if (!m->is_ignored_by_security_stack_walk()) {
777 // We have reached the desired frame; return the holder class.
778 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
779 }
780 break;
781 }
782 }
783 return NULL;
784 JVM_END
785
786
787 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
788 oop mirror = NULL;
789 BasicType t = name2type(utf);
790 if (t != T_ILLEGAL && !is_reference_type(t)) {
791 mirror = Universe::java_mirror(t);
792 }
793 if (mirror == NULL) {
794 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
795 } else {
796 return (jclass) JNIHandles::make_local(THREAD, mirror);
797 }
798 JVM_END
799
800
801 // Returns a class loaded by the bootstrap class loader; or null
802 // if not found. ClassNotFoundException is not thrown.
803 // FindClassFromBootLoader is exported to the launcher for windows.
804 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
805 const char* name))
806 // Java libraries should ensure that name is never null or illegal.
807 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
808 // It's impossible to create this class; the name cannot fit
809 // into the constant pool.
810 return NULL;
811 }
812 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
813
814 TempNewSymbol h_name = SymbolTable::new_symbol(name);
815 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
816 if (k == NULL) {
817 return NULL;
818 }
819
820 if (log_is_enabled(Debug, class, resolve)) {
821 trace_class_resolution(k);
822 }
823 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
824 JVM_END
825
826 // Find a class with this name in this loader, using the caller's protection domain.
827 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
828 jboolean init, jobject loader,
829 jclass caller))
830 TempNewSymbol h_name =
831 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
832 CHECK_NULL);
833
834 oop loader_oop = JNIHandles::resolve(loader);
835 oop from_class = JNIHandles::resolve(caller);
836 oop protection_domain = NULL;
837 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
838 // NPE. Put it in another way, the bootstrap class loader has all permission and
839 // thus no checkPackageAccess equivalence in the VM class loader.
840 // The caller is also passed as NULL by the java code if there is no security
841 // manager to avoid the performance cost of getting the calling class.
842 if (from_class != NULL && loader_oop != NULL) {
843 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
844 }
845
846 Handle h_loader(THREAD, loader_oop);
847 Handle h_prot(THREAD, protection_domain);
848 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
849 h_prot, false, THREAD);
850
851 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
852 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
853 }
854 return result;
855 JVM_END
856
857 // Currently only called from the old verifier.
858 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
859 jboolean init, jclass from))
860 TempNewSymbol h_name =
861 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
862 CHECK_NULL);
863 oop from_class_oop = JNIHandles::resolve(from);
864 Klass* from_class = (from_class_oop == NULL)
865 ? (Klass*)NULL
866 : java_lang_Class::as_Klass(from_class_oop);
867 oop class_loader = NULL;
868 oop protection_domain = NULL;
869 if (from_class != NULL) {
870 class_loader = from_class->class_loader();
871 protection_domain = from_class->protection_domain();
872 }
873 Handle h_loader(THREAD, class_loader);
874 Handle h_prot (THREAD, protection_domain);
875 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
876 h_prot, true, thread);
877
878 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
879 // this function is generally only used for class loading during verification.
880 ResourceMark rm;
881 oop from_mirror = JNIHandles::resolve_non_null(from);
882 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
883 const char * from_name = from_class->external_name();
884
885 oop mirror = JNIHandles::resolve_non_null(result);
886 Klass* to_class = java_lang_Class::as_Klass(mirror);
887 const char * to = to_class->external_name();
888 log_debug(class, resolve)("%s %s (verification)", from_name, to);
889 }
890
891 return result;
892 JVM_END
893
894 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
895 static jclass jvm_define_class_common(const char *name,
896 jobject loader, const jbyte *buf,
897 jsize len, jobject pd, const char *source,
898 TRAPS) {
899 if (source == NULL) source = "__JVM_DefineClass__";
900
901 JavaThread* jt = THREAD;
902
903 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
904 ClassLoader::perf_define_appclass_selftime(),
905 ClassLoader::perf_define_appclasses(),
906 jt->get_thread_stat()->perf_recursion_counts_addr(),
907 jt->get_thread_stat()->perf_timers_addr(),
908 PerfClassTraceTime::DEFINE_CLASS);
909
910 if (UsePerfData) {
911 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
912 }
913
914 // Class resolution will get the class name from the .class stream if the name is null.
915 TempNewSymbol class_name = name == NULL ? NULL :
916 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
917 CHECK_NULL);
918
919 ResourceMark rm(THREAD);
920 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
921 Handle class_loader (THREAD, JNIHandles::resolve(loader));
922 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
923 ClassLoadInfo cl_info(protection_domain);
924 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
925 class_loader,
926 cl_info,
927 CHECK_NULL);
928
929 if (log_is_enabled(Debug, class, resolve)) {
930 trace_class_resolution(k);
931 }
932
933 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
934 }
935
936 enum {
937 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
938 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
939 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
940 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
941 };
942
943 /*
944 * Define a class with the specified flags that indicates if it's a nestmate,
945 * hidden, or strongly referenced from class loader.
946 */
947 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
948 const jbyte *buf, jsize len, jobject pd,
949 jboolean init, int flags, jobject classData, TRAPS) {
950 ResourceMark rm(THREAD);
951
952 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
953 // Lookup class must be a non-null instance
954 if (lookup_k == NULL) {
955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
956 }
957 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
958
959 Handle class_loader (THREAD, lookup_k->class_loader());
960
961 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
962 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
963 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
964 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
965
966 InstanceKlass* host_class = NULL;
967 if (is_nestmate) {
968 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
969 }
970
971 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
972 name,
973 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
974 is_nestmate ? host_class->external_name() : "",
975 is_hidden ? "hidden" : "not hidden",
976 is_strong ? "strong" : "weak",
977 vm_annotations ? "with vm annotations" : "without vm annotation");
978
979 if (!is_hidden) {
980 // classData is only applicable for hidden classes
981 if (classData != NULL) {
982 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
983 }
984 if (is_nestmate) {
985 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
986 }
987 if (!is_strong) {
988 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
989 }
990 if (vm_annotations) {
991 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
992 }
993 if (flags != STRONG_LOADER_LINK) {
994 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
995 err_msg("invalid flag 0x%x", flags));
996 }
997 }
998
999 // Class resolution will get the class name from the .class stream if the name is null.
1000 TempNewSymbol class_name = name == NULL ? NULL :
1001 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1002 CHECK_NULL);
1003
1004 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1005 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1006 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1007
1008 InstanceKlass* ik = NULL;
1009 if (!is_hidden) {
1010 ClassLoadInfo cl_info(protection_domain);
1011 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1012 class_loader,
1013 cl_info,
1014 CHECK_NULL);
1015
1016 if (log_is_enabled(Debug, class, resolve)) {
1017 trace_class_resolution(ik);
1018 }
1019 } else { // hidden
1020 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1021 ClassLoadInfo cl_info(protection_domain,
1022 host_class,
1023 classData_h,
1024 is_hidden,
1025 is_strong,
1026 vm_annotations);
1027 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1028 class_loader,
1029 cl_info,
1030 CHECK_NULL);
1031
1032 // The hidden class loader data has been artificially been kept alive to
1033 // this point. The mirror and any instances of this class have to keep
1034 // it alive afterwards.
1035 ik->class_loader_data()->dec_keep_alive();
1036
1037 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1038 ModuleEntry* module = ik->module();
1039 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1040 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1041 module_name,
1042 ik->external_name(),
1043 host_class->external_name(),
1044 ik->is_hidden() ? "is hidden" : "is not hidden");
1045 }
1046 }
1047 assert(Reflection::is_same_class_package(lookup_k, ik),
1048 "lookup class and defined class are in different packages");
1049
1050 if (init) {
1051 ik->initialize(CHECK_NULL);
1052 } else {
1053 ik->link_class(CHECK_NULL);
1054 }
1055
1056 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1057 }
1058
1059 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1060 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1061 JVM_END
1062
1063 /*
1064 * Define a class with the specified lookup class.
1065 * lookup: Lookup class
1066 * name: the name of the class
1067 * buf: class bytes
1068 * len: length of class bytes
1069 * pd: protection domain
1070 * init: initialize the class
1071 * flags: properties of the class
1072 * classData: private static pre-initialized field
1073 */
1074 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1075 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1076
1077 if (lookup == NULL) {
1078 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1079 }
1080
1081 assert(buf != NULL, "buf must not be NULL");
1082
1083 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1084 JVM_END
1085
1086 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1087
1088 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1089 JVM_END
1090
1091 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1092 ResourceMark rm(THREAD);
1093
1094 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1095 char* str = java_lang_String::as_utf8_string(h_name());
1096
1097 // Sanity check, don't expect null
1098 if (str == NULL) return NULL;
1099
1100 // Internalize the string, converting '.' to '/' in string.
1101 char* p = (char*)str;
1102 while (*p != '\0') {
1103 if (*p == '.') {
1104 *p = '/';
1105 }
1106 p++;
1107 }
1108
1109 const int str_len = (int)(p - str);
1110 if (str_len > Symbol::max_length()) {
1111 // It's impossible to create this class; the name cannot fit
1112 // into the constant pool.
1113 return NULL;
1114 }
1115 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1116
1117 // Security Note:
1118 // The Java level wrapper will perform the necessary security check allowing
1119 // us to pass the NULL as the initiating class loader.
1120 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1121 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1122 h_loader,
1123 Handle());
1124 #if INCLUDE_CDS
1125 if (k == NULL) {
1126 // If the class is not already loaded, try to see if it's in the shared
1127 // archive for the current classloader (h_loader).
1128 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1129 }
1130 #endif
1131 return (k == NULL) ? NULL :
1132 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1133 JVM_END
1134
1135 // Module support //////////////////////////////////////////////////////////////////////////////
1136
1137 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1138 jstring location, jobjectArray packages))
1139 Handle h_module (THREAD, JNIHandles::resolve(module));
1140 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1141 JVM_END
1142
1143 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1144 Handle h_module (THREAD, JNIHandles::resolve(module));
1145 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1146 JVM_END
1147
1148 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1149 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1150 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1151 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1152 JVM_END
1153
1154 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1155 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1156 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1157 JVM_END
1158
1159 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1160 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1161 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1162 JVM_END
1163
1164 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1165 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1166 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1167 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1168 JVM_END
1169
1170 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1171 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1172 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1173 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1174 JVM_END
1175
1176 // Reflection support //////////////////////////////////////////////////////////////////////////////
1177
1178 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1179 assert (cls != NULL, "illegal class");
1180 JvmtiVMObjectAllocEventCollector oam;
1181 ResourceMark rm(THREAD);
1182 HandleMark hm(THREAD);
1183 Handle java_class(THREAD, JNIHandles::resolve(cls));
1184 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1185 return (jstring) JNIHandles::make_local(THREAD, result);
1186 JVM_END
1187
1188
1189 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1190 JvmtiVMObjectAllocEventCollector oam;
1191 oop mirror = JNIHandles::resolve_non_null(cls);
1192
1193 // Special handling for primitive objects
1194 if (java_lang_Class::is_primitive(mirror)) {
1195 // Primitive objects does not have any interfaces
1196 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1197 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1198 }
1199
1200 Klass* klass = java_lang_Class::as_Klass(mirror);
1201 // Figure size of result array
1202 int size;
1203 if (klass->is_instance_klass()) {
1204 InstanceKlass* ik = InstanceKlass::cast(klass);
1205 size = ik->local_interfaces()->length();
1206 } else {
1207 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1208 size = 2;
1209 }
1210
1211 // Allocate result array
1212 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1213 objArrayHandle result (THREAD, r);
1214 // Fill in result
1215 if (klass->is_instance_klass()) {
1216 // Regular instance klass, fill in all local interfaces
1217 for (int index = 0; index < size; index++) {
1218 InstanceKlass* ik = InstanceKlass::cast(klass);
1219 Klass* k = ik->local_interfaces()->at(index);
1220 result->obj_at_put(index, k->java_mirror());
1221 }
1222 } else {
1223 // All arrays implement java.lang.Cloneable and java.io.Serializable
1224 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1225 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1226 }
1227 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1228 JVM_END
1229
1230
1231 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1232 oop mirror = JNIHandles::resolve_non_null(cls);
1233 if (java_lang_Class::is_primitive(mirror)) {
1234 return JNI_FALSE;
1235 }
1236 Klass* k = java_lang_Class::as_Klass(mirror);
1237 jboolean result = k->is_interface();
1238 assert(!result || k->is_instance_klass(),
1239 "all interfaces are instance types");
1240 // The compiler intrinsic for isInterface tests the
1241 // Klass::_access_flags bits in the same way.
1242 return result;
1243 JVM_END
1244
1245 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1246 oop mirror = JNIHandles::resolve_non_null(cls);
1247 if (java_lang_Class::is_primitive(mirror)) {
1248 return JNI_FALSE;
1249 }
1250 Klass* k = java_lang_Class::as_Klass(mirror);
1251 return k->is_hidden();
1252 JVM_END
1253
1254 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1255 JvmtiVMObjectAllocEventCollector oam;
1256 oop mirror = JNIHandles::resolve_non_null(cls);
1257 if (java_lang_Class::is_primitive(mirror)) {
1258 // There are no signers for primitive types
1259 return NULL;
1260 }
1261
1262 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1263
1264 // If there are no signers set in the class, or if the class
1265 // is an array, return NULL.
1266 if (signers == NULL) return NULL;
1267
1268 // copy of the signers array
1269 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1270 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1271 for (int index = 0; index < signers->length(); index++) {
1272 signers_copy->obj_at_put(index, signers->obj_at(index));
1273 }
1274
1275 // return the copy
1276 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1277 JVM_END
1278
1279
1280 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1281 oop mirror = JNIHandles::resolve_non_null(cls);
1282 if (!java_lang_Class::is_primitive(mirror)) {
1283 // This call is ignored for primitive types and arrays.
1284 // Signers are only set once, ClassLoader.java, and thus shouldn't
1285 // be called with an array. Only the bootstrap loader creates arrays.
1286 Klass* k = java_lang_Class::as_Klass(mirror);
1287 if (k->is_instance_klass()) {
1288 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1289 }
1290 }
1291 JVM_END
1292
1293
1294 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1295 oop mirror = JNIHandles::resolve_non_null(cls);
1296 if (mirror == NULL) {
1297 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1298 }
1299
1300 if (java_lang_Class::is_primitive(mirror)) {
1301 // Primitive types does not have a protection domain.
1302 return NULL;
1303 }
1304
1305 oop pd = java_lang_Class::protection_domain(mirror);
1306 return (jobject) JNIHandles::make_local(THREAD, pd);
1307 JVM_END
1308
1309
1310 // Returns the inherited_access_control_context field of the running thread.
1311 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1312 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1313 return JNIHandles::make_local(THREAD, result);
1314 JVM_END
1315
1316 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1317 if (!UsePrivilegedStack) return NULL;
1318
1319 ResourceMark rm(THREAD);
1320 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1321 JvmtiVMObjectAllocEventCollector oam;
1322
1323 // count the protection domains on the execution stack. We collapse
1324 // duplicate consecutive protection domains into a single one, as
1325 // well as stopping when we hit a privileged frame.
1326
1327 oop previous_protection_domain = NULL;
1328 Handle privileged_context(thread, NULL);
1329 bool is_privileged = false;
1330 oop protection_domain = NULL;
1331
1332 // Iterate through Java frames
1333 vframeStream vfst(thread);
1334 for(; !vfst.at_end(); vfst.next()) {
1335 // get method of frame
1336 Method* method = vfst.method();
1337
1338 // stop at the first privileged frame
1339 if (method->method_holder() == vmClasses::AccessController_klass() &&
1340 method->name() == vmSymbols::executePrivileged_name())
1341 {
1342 // this frame is privileged
1343 is_privileged = true;
1344
1345 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1346
1347 StackValueCollection* locals = priv->locals();
1348 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1349 StackValue* clr_sv = locals->at(2); // Class<?> caller
1350 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1351 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1352 privileged_context = ctx_sv->get_obj();
1353 Handle caller = clr_sv->get_obj();
1354
1355 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1356 protection_domain = caller_klass->protection_domain();
1357 } else {
1358 protection_domain = method->method_holder()->protection_domain();
1359 }
1360
1361 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1362 local_array->push(Handle(thread, protection_domain));
1363 previous_protection_domain = protection_domain;
1364 }
1365
1366 if (is_privileged) break;
1367 }
1368
1369
1370 // either all the domains on the stack were system domains, or
1371 // we had a privileged system domain
1372 if (local_array->is_empty()) {
1373 if (is_privileged && privileged_context.is_null()) return NULL;
1374
1375 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1376 return JNIHandles::make_local(THREAD, result);
1377 }
1378
1379 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1380 local_array->length(), CHECK_NULL);
1381 objArrayHandle h_context(thread, context);
1382 for (int index = 0; index < local_array->length(); index++) {
1383 h_context->obj_at_put(index, local_array->at(index)());
1384 }
1385
1386 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1387
1388 return JNIHandles::make_local(THREAD, result);
1389 JVM_END
1390
1391
1392 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1393 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1394 return (k != NULL) && k->is_array_klass() ? true : false;
1395 JVM_END
1396
1397
1398 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1399 oop mirror = JNIHandles::resolve_non_null(cls);
1400 return (jboolean) java_lang_Class::is_primitive(mirror);
1401 JVM_END
1402
1403
1404 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1405 oop mirror = JNIHandles::resolve_non_null(cls);
1406 if (java_lang_Class::is_primitive(mirror)) {
1407 // Primitive type
1408 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1409 }
1410
1411 Klass* k = java_lang_Class::as_Klass(mirror);
1412 debug_only(int computed_modifiers = k->compute_modifier_flags());
1413 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1414 return k->modifier_flags();
1415 JVM_END
1416
1417
1418 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1419
1420 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1421 JvmtiVMObjectAllocEventCollector oam;
1422 // ofClass is a reference to a java_lang_Class object. The mirror object
1423 // of an InstanceKlass
1424 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1425 if (java_lang_Class::is_primitive(ofMirror) ||
1426 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1427 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1428 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1429 }
1430
1431 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1432 InnerClassesIterator iter(k);
1433
1434 if (iter.length() == 0) {
1435 // Neither an inner nor outer class
1436 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1437 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1438 }
1439
1440 // find inner class info
1441 constantPoolHandle cp(thread, k->constants());
1442 int length = iter.length();
1443
1444 // Allocate temp. result array
1445 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1446 objArrayHandle result (THREAD, r);
1447 int members = 0;
1448
1449 for (; !iter.done(); iter.next()) {
1450 int ioff = iter.inner_class_info_index();
1451 int ooff = iter.outer_class_info_index();
1452
1453 if (ioff != 0 && ooff != 0) {
1454 // Check to see if the name matches the class we're looking for
1455 // before attempting to find the class.
1456 if (cp->klass_name_at_matches(k, ooff)) {
1457 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1458 if (outer_klass == k) {
1459 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1460 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1461
1462 // Throws an exception if outer klass has not declared k as
1463 // an inner klass
1464 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1465
1466 result->obj_at_put(members, inner_klass->java_mirror());
1467 members++;
1468 }
1469 }
1470 }
1471 }
1472
1473 if (members != length) {
1474 // Return array of right length
1475 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1476 for(int i = 0; i < members; i++) {
1477 res->obj_at_put(i, result->obj_at(i));
1478 }
1479 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1480 }
1481
1482 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1483 JVM_END
1484
1485
1486 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1487 {
1488 // ofClass is a reference to a java_lang_Class object.
1489 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1490 if (java_lang_Class::is_primitive(ofMirror)) {
1491 return NULL;
1492 }
1493 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1494 if (!klass->is_instance_klass()) {
1495 return NULL;
1496 }
1497
1498 bool inner_is_member = false;
1499 Klass* outer_klass
1500 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1501 if (outer_klass == NULL) return NULL; // already a top-level class
1502 if (!inner_is_member) return NULL; // a hidden class (inside a method)
1503 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1504 }
1505 JVM_END
1506
1507 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1508 {
1509 oop mirror = JNIHandles::resolve_non_null(cls);
1510 if (java_lang_Class::is_primitive(mirror)) {
1511 return NULL;
1512 }
1513 Klass* klass = java_lang_Class::as_Klass(mirror);
1514 if (!klass->is_instance_klass()) {
1515 return NULL;
1516 }
1517 InstanceKlass* k = InstanceKlass::cast(klass);
1518 int ooff = 0, noff = 0;
1519 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1520 if (noff != 0) {
1521 constantPoolHandle i_cp(thread, k->constants());
1522 Symbol* name = i_cp->symbol_at(noff);
1523 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1524 return (jstring) JNIHandles::make_local(THREAD, str());
1525 }
1526 }
1527 return NULL;
1528 }
1529 JVM_END
1530
1531 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1532 assert (cls != NULL, "illegal class");
1533 JvmtiVMObjectAllocEventCollector oam;
1534 ResourceMark rm(THREAD);
1535 oop mirror = JNIHandles::resolve_non_null(cls);
1536 // Return null for arrays and primitives
1537 if (!java_lang_Class::is_primitive(mirror)) {
1538 Klass* k = java_lang_Class::as_Klass(mirror);
1539 if (k->is_instance_klass()) {
1540 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1541 if (sym == NULL) return NULL;
1542 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1543 return (jstring) JNIHandles::make_local(THREAD, str());
1544 }
1545 }
1546 return NULL;
1547 JVM_END
1548
1549
1550 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1551 assert (cls != NULL, "illegal class");
1552 oop mirror = JNIHandles::resolve_non_null(cls);
1553 // Return null for arrays and primitives
1554 if (!java_lang_Class::is_primitive(mirror)) {
1555 Klass* k = java_lang_Class::as_Klass(mirror);
1556 if (k->is_instance_klass()) {
1557 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1558 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1559 }
1560 }
1561 return NULL;
1562 JVM_END
1563
1564
1565 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1566 // some of this code was adapted from from jni_FromReflectedField
1567
1568 oop reflected = JNIHandles::resolve_non_null(field);
1569 oop mirror = java_lang_reflect_Field::clazz(reflected);
1570 Klass* k = java_lang_Class::as_Klass(mirror);
1571 int slot = java_lang_reflect_Field::slot(reflected);
1572 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1573
1574 InstanceKlass* ik = InstanceKlass::cast(k);
1575 intptr_t offset = ik->field_offset(slot);
1576
1577 if (modifiers & JVM_ACC_STATIC) {
1578 // for static fields we only look in the current class
1579 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1580 assert(false, "cannot find static field");
1581 return false;
1582 }
1583 } else {
1584 // for instance fields we start with the current class and work
1585 // our way up through the superclass chain
1586 if (!ik->find_field_from_offset(offset, false, &fd)) {
1587 assert(false, "cannot find instance field");
1588 return false;
1589 }
1590 }
1591 return true;
1592 }
1593
1594 static Method* jvm_get_method_common(jobject method) {
1595 // some of this code was adapted from from jni_FromReflectedMethod
1596
1597 oop reflected = JNIHandles::resolve_non_null(method);
1598 oop mirror = NULL;
1599 int slot = 0;
1600
1601 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1602 mirror = java_lang_reflect_Constructor::clazz(reflected);
1603 slot = java_lang_reflect_Constructor::slot(reflected);
1604 } else {
1605 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1606 "wrong type");
1607 mirror = java_lang_reflect_Method::clazz(reflected);
1608 slot = java_lang_reflect_Method::slot(reflected);
1609 }
1610 Klass* k = java_lang_Class::as_Klass(mirror);
1611
1612 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1613 assert(m != NULL, "cannot find method");
1614 return m; // caller has to deal with NULL in product mode
1615 }
1616
1617 /* Type use annotations support (JDK 1.8) */
1618
1619 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1620 assert (cls != NULL, "illegal class");
1621 ResourceMark rm(THREAD);
1622 // Return null for arrays and primitives
1623 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1624 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1625 if (k->is_instance_klass()) {
1626 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1627 if (type_annotations != NULL) {
1628 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1629 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1630 }
1631 }
1632 }
1633 return NULL;
1634 JVM_END
1635
1636 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1637 assert (method != NULL, "illegal method");
1638 // method is a handle to a java.lang.reflect.Method object
1639 Method* m = jvm_get_method_common(method);
1640 if (m == NULL) {
1641 return NULL;
1642 }
1643
1644 AnnotationArray* type_annotations = m->type_annotations();
1645 if (type_annotations != NULL) {
1646 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1647 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1648 }
1649
1650 return NULL;
1651 JVM_END
1652
1653 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1654 assert (field != NULL, "illegal field");
1655 fieldDescriptor fd;
1656 bool gotFd = jvm_get_field_common(field, fd);
1657 if (!gotFd) {
1658 return NULL;
1659 }
1660
1661 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1662 JVM_END
1663
1664 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1665 if (!cp->is_within_bounds(index)) {
1666 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1667 }
1668 }
1669
1670 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1671 {
1672 // method is a handle to a java.lang.reflect.Method object
1673 Method* method_ptr = jvm_get_method_common(method);
1674 methodHandle mh (THREAD, method_ptr);
1675 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1676 const int num_params = mh->method_parameters_length();
1677
1678 if (num_params < 0) {
1679 // A -1 return value from method_parameters_length means there is no
1680 // parameter data. Return null to indicate this to the reflection
1681 // API.
1682 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1683 return (jobjectArray)NULL;
1684 } else {
1685 // Otherwise, we return something up to reflection, even if it is
1686 // a zero-length array. Why? Because in some cases this can
1687 // trigger a MalformedParametersException.
1688
1689 // make sure all the symbols are properly formatted
1690 for (int i = 0; i < num_params; i++) {
1691 MethodParametersElement* params = mh->method_parameters_start();
1692 int index = params[i].name_cp_index;
1693 constantPoolHandle cp(THREAD, mh->constants());
1694 bounds_check(cp, index, CHECK_NULL);
1695
1696 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1697 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1698 "Wrong type at constant pool index");
1699 }
1700
1701 }
1702
1703 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1704 objArrayHandle result (THREAD, result_oop);
1705
1706 for (int i = 0; i < num_params; i++) {
1707 MethodParametersElement* params = mh->method_parameters_start();
1708 // For a 0 index, give a NULL symbol
1709 Symbol* sym = 0 != params[i].name_cp_index ?
1710 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1711 int flags = params[i].flags;
1712 oop param = Reflection::new_parameter(reflected_method, i, sym,
1713 flags, CHECK_NULL);
1714 result->obj_at_put(i, param);
1715 }
1716 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1717 }
1718 }
1719 JVM_END
1720
1721 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1722
1723 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1724 {
1725 JvmtiVMObjectAllocEventCollector oam;
1726
1727 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1728 // Exclude primitive types and array types
1729 if (java_lang_Class::is_primitive(ofMirror) ||
1730 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1731 // Return empty array
1732 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1733 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1734 }
1735
1736 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1737 constantPoolHandle cp(THREAD, k->constants());
1738
1739 // Ensure class is linked
1740 k->link_class(CHECK_NULL);
1741
1742 // Allocate result
1743 int num_fields;
1744
1745 if (publicOnly) {
1746 num_fields = 0;
1747 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1748 if (fs.access_flags().is_public()) ++num_fields;
1749 }
1750 } else {
1751 num_fields = k->java_fields_count();
1752 }
1753
1754 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1755 objArrayHandle result (THREAD, r);
1756
1757 int out_idx = 0;
1758 fieldDescriptor fd;
1759 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1760 if (!publicOnly || fs.access_flags().is_public()) {
1761 fd.reinitialize(k, fs.index());
1762 oop field = Reflection::new_field(&fd, CHECK_NULL);
1763 result->obj_at_put(out_idx, field);
1764 ++out_idx;
1765 }
1766 }
1767 assert(out_idx == num_fields, "just checking");
1768 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1769 }
1770 JVM_END
1771
1772 // A class is a record if and only if it is final and a direct subclass of
1773 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1774 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1775 {
1776 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1777 if (k != NULL && k->is_instance_klass()) {
1778 InstanceKlass* ik = InstanceKlass::cast(k);
1779 return ik->is_record();
1780 } else {
1781 return false;
1782 }
1783 }
1784 JVM_END
1785
1786 // Returns an array containing the components of the Record attribute,
1787 // or NULL if the attribute is not present.
1788 //
1789 // Note that this function returns the components of the Record attribute
1790 // even if the class is not a record.
1791 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1792 {
1793 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1794 assert(c->is_instance_klass(), "must be");
1795 InstanceKlass* ik = InstanceKlass::cast(c);
1796
1797 Array<RecordComponent*>* components = ik->record_components();
1798 if (components != NULL) {
1799 JvmtiVMObjectAllocEventCollector oam;
1800 constantPoolHandle cp(THREAD, ik->constants());
1801 int length = components->length();
1802 assert(length >= 0, "unexpected record_components length");
1803 objArrayOop record_components =
1804 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1805 objArrayHandle components_h (THREAD, record_components);
1806
1807 for (int x = 0; x < length; x++) {
1808 RecordComponent* component = components->at(x);
1809 assert(component != NULL, "unexpected NULL record component");
1810 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1811 components_h->obj_at_put(x, component_oop);
1812 }
1813 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1814 }
1815
1816 return NULL;
1817 }
1818 JVM_END
1819
1820 static bool select_method(const methodHandle& method, bool want_constructor) {
1821 bool is_ctor = (method->is_object_constructor() ||
1822 method->is_static_init_factory());
1823 if (want_constructor) {
1824 return is_ctor;
1825 } else {
1826 return (!is_ctor &&
1827 !method->is_class_initializer() &&
1828 !method->is_overpass());
1829 }
1830 }
1831
1832 static jobjectArray get_class_declared_methods_helper(
1833 JNIEnv *env,
1834 jclass ofClass, jboolean publicOnly,
1835 bool want_constructor,
1836 Klass* klass, TRAPS) {
1837
1838 JvmtiVMObjectAllocEventCollector oam;
1839
1840 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1841 // Exclude primitive types and array types
1842 if (java_lang_Class::is_primitive(ofMirror)
1843 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1844 // Return empty array
1845 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1846 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1847 }
1848
1849 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1850
1851 // Ensure class is linked
1852 k->link_class(CHECK_NULL);
1853
1854 Array<Method*>* methods = k->methods();
1855 int methods_length = methods->length();
1856
1857 // Save original method_idnum in case of redefinition, which can change
1858 // the idnum of obsolete methods. The new method will have the same idnum
1859 // but if we refresh the methods array, the counts will be wrong.
1860 ResourceMark rm(THREAD);
1861 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1862 int num_methods = 0;
1863
1864 for (int i = 0; i < methods_length; i++) {
1865 methodHandle method(THREAD, methods->at(i));
1866 if (select_method(method, want_constructor)) {
1867 if (!publicOnly || method->is_public()) {
1868 idnums->push(method->method_idnum());
1869 ++num_methods;
1870 }
1871 }
1872 }
1873
1874 // Allocate result
1875 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1876 objArrayHandle result (THREAD, r);
1877
1878 // Now just put the methods that we selected above, but go by their idnum
1879 // in case of redefinition. The methods can be redefined at any safepoint,
1880 // so above when allocating the oop array and below when creating reflect
1881 // objects.
1882 for (int i = 0; i < num_methods; i++) {
1883 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1884 if (method.is_null()) {
1885 // Method may have been deleted and seems this API can handle null
1886 // Otherwise should probably put a method that throws NSME
1887 result->obj_at_put(i, NULL);
1888 } else {
1889 oop m;
1890 if (want_constructor) {
1891 assert(method->is_object_constructor() ||
1892 method->is_static_init_factory(), "must be");
1893 m = Reflection::new_constructor(method, CHECK_NULL);
1894 } else {
1895 m = Reflection::new_method(method, false, CHECK_NULL);
1896 }
1897 result->obj_at_put(i, m);
1898 }
1899 }
1900
1901 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1902 }
1903
1904 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1905 {
1906 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1907 /*want_constructor*/ false,
1908 vmClasses::reflect_Method_klass(), THREAD);
1909 }
1910 JVM_END
1911
1912 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1913 {
1914 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1915 /*want_constructor*/ true,
1916 vmClasses::reflect_Constructor_klass(), THREAD);
1917 }
1918 JVM_END
1919
1920 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1921 {
1922 oop mirror = JNIHandles::resolve_non_null(cls);
1923 if (java_lang_Class::is_primitive(mirror)) {
1924 // Primitive type
1925 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1926 }
1927
1928 Klass* k = java_lang_Class::as_Klass(mirror);
1929 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1930 }
1931 JVM_END
1932
1933 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1934 {
1935 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1936 assert(c->is_instance_klass(), "must be");
1937 InstanceKlass* ck = InstanceKlass::cast(c);
1938 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1939 assert(m->is_instance_klass(), "must be");
1940 InstanceKlass* mk = InstanceKlass::cast(m);
1941 return ck->has_nestmate_access_to(mk, THREAD);
1942 }
1943 JVM_END
1944
1945 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1946 {
1947 // current is not a primitive or array class
1948 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1949 assert(c->is_instance_klass(), "must be");
1950 InstanceKlass* ck = InstanceKlass::cast(c);
1951 InstanceKlass* host = ck->nest_host(THREAD);
1952 return (jclass) (host == NULL ? NULL :
1953 JNIHandles::make_local(THREAD, host->java_mirror()));
1954 }
1955 JVM_END
1956
1957 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1958 {
1959 // current is not a primitive or array class
1960 ResourceMark rm(THREAD);
1961 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1962 assert(c->is_instance_klass(), "must be");
1963 InstanceKlass* ck = InstanceKlass::cast(c);
1964 InstanceKlass* host = ck->nest_host(THREAD);
1965
1966 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1967 ck->external_name(), host->external_name());
1968 {
1969 JvmtiVMObjectAllocEventCollector oam;
1970 Array<u2>* members = host->nest_members();
1971 int length = members == NULL ? 0 : members->length();
1972
1973 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1974
1975 // nest host is first in the array so make it one bigger
1976 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1977 length + 1, CHECK_NULL);
1978 objArrayHandle result(THREAD, r);
1979 result->obj_at_put(0, host->java_mirror());
1980 if (length != 0) {
1981 int count = 0;
1982 for (int i = 0; i < length; i++) {
1983 int cp_index = members->at(i);
1984 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1985 if (HAS_PENDING_EXCEPTION) {
1986 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1987 return NULL; // propagate VMEs
1988 }
1989 if (log_is_enabled(Trace, class, nestmates)) {
1990 stringStream ss;
1991 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1992 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1993 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1994 log_trace(class, nestmates)("%s", ss.as_string());
1995 }
1996 CLEAR_PENDING_EXCEPTION;
1997 continue;
1998 }
1999 if (k->is_instance_klass()) {
2000 InstanceKlass* ik = InstanceKlass::cast(k);
2001 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2002 if (nest_host_k == host) {
2003 result->obj_at_put(count+1, k->java_mirror());
2004 count++;
2005 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2006 } else {
2007 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2008 ik->external_name(), nest_host_k->external_name());
2009 }
2010 } else {
2011 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2012 k->external_name());
2013 }
2014 }
2015 if (count < length) {
2016 // we had invalid entries so we need to compact the array
2017 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2018 length + 1, count + 1);
2019
2020 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2021 count + 1, CHECK_NULL);
2022 objArrayHandle result2(THREAD, r2);
2023 for (int i = 0; i < count + 1; i++) {
2024 result2->obj_at_put(i, result->obj_at(i));
2025 }
2026 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2027 }
2028 }
2029 else {
2030 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2031 }
2032 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2033 }
2034 }
2035 JVM_END
2036
2037 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2038 {
2039 oop mirror = JNIHandles::resolve_non_null(current);
2040 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2041 Klass* c = java_lang_Class::as_Klass(mirror);
2042 assert(c->is_instance_klass(), "must be");
2043 InstanceKlass* ik = InstanceKlass::cast(c);
2044 ResourceMark rm(THREAD);
2045 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2046 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2047 if (ik->is_sealed()) {
2048 JvmtiVMObjectAllocEventCollector oam;
2049 Array<u2>* subclasses = ik->permitted_subclasses();
2050 int length = subclasses->length();
2051
2052 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2053
2054 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2055 length, CHECK_NULL);
2056 objArrayHandle result(THREAD, r);
2057 int count = 0;
2058 for (int i = 0; i < length; i++) {
2059 int cp_index = subclasses->at(i);
2060 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2061 if (HAS_PENDING_EXCEPTION) {
2062 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2063 return NULL; // propagate VMEs
2064 }
2065 if (log_is_enabled(Trace, class, sealed)) {
2066 stringStream ss;
2067 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2068 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2069 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2070 log_trace(class, sealed)("%s", ss.as_string());
2071 }
2072
2073 CLEAR_PENDING_EXCEPTION;
2074 continue;
2075 }
2076 if (k->is_instance_klass()) {
2077 result->obj_at_put(count++, k->java_mirror());
2078 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2079 }
2080 }
2081 if (count < length) {
2082 // we had invalid entries so we need to compact the array
2083 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2084 count, CHECK_NULL);
2085 objArrayHandle result2(THREAD, r2);
2086 for (int i = 0; i < count; i++) {
2087 result2->obj_at_put(i, result->obj_at(i));
2088 }
2089 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2090 }
2091 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2092 } else {
2093 return NULL;
2094 }
2095 }
2096 JVM_END
2097
2098 // Constant pool access //////////////////////////////////////////////////////////
2099
2100 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2101 {
2102 JvmtiVMObjectAllocEventCollector oam;
2103 oop mirror = JNIHandles::resolve_non_null(cls);
2104 // Return null for primitives and arrays
2105 if (!java_lang_Class::is_primitive(mirror)) {
2106 Klass* k = java_lang_Class::as_Klass(mirror);
2107 if (k->is_instance_klass()) {
2108 InstanceKlass* k_h = InstanceKlass::cast(k);
2109 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2110 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2111 return JNIHandles::make_local(THREAD, jcp());
2112 }
2113 }
2114 return NULL;
2115 }
2116 JVM_END
2117
2118
2119 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2120 {
2121 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2122 return cp->length();
2123 }
2124 JVM_END
2125
2126
2127 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2128 {
2129 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2130 bounds_check(cp, index, CHECK_NULL);
2131 constantTag tag = cp->tag_at(index);
2132 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2133 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2134 }
2135 Klass* k = cp->klass_at(index, CHECK_NULL);
2136 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2137 }
2138 JVM_END
2139
2140 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2141 {
2142 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2143 bounds_check(cp, index, CHECK_NULL);
2144 constantTag tag = cp->tag_at(index);
2145 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2146 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2147 }
2148 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2149 if (k == NULL) return NULL;
2150 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2151 }
2152 JVM_END
2153
2154 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2155 constantTag tag = cp->tag_at(index);
2156 if (!tag.is_method() && !tag.is_interface_method()) {
2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158 }
2159 int klass_ref = cp->uncached_klass_ref_index_at(index);
2160 Klass* k_o;
2161 if (force_resolution) {
2162 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2163 } else {
2164 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2165 if (k_o == NULL) return NULL;
2166 }
2167 InstanceKlass* k = InstanceKlass::cast(k_o);
2168 Symbol* name = cp->uncached_name_ref_at(index);
2169 Symbol* sig = cp->uncached_signature_ref_at(index);
2170 methodHandle m (THREAD, k->find_method(name, sig));
2171 if (m.is_null()) {
2172 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2173 }
2174 oop method;
2175 if (m->is_object_constructor() || m->is_static_init_factory()) {
2176 method = Reflection::new_constructor(m, CHECK_NULL);
2177 } else {
2178 method = Reflection::new_method(m, true, CHECK_NULL);
2179 }
2180 return JNIHandles::make_local(THREAD, method);
2181 }
2182
2183 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2184 {
2185 JvmtiVMObjectAllocEventCollector oam;
2186 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2187 bounds_check(cp, index, CHECK_NULL);
2188 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2189 return res;
2190 }
2191 JVM_END
2192
2193 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2194 {
2195 JvmtiVMObjectAllocEventCollector oam;
2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2197 bounds_check(cp, index, CHECK_NULL);
2198 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2199 return res;
2200 }
2201 JVM_END
2202
2203 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2204 constantTag tag = cp->tag_at(index);
2205 if (!tag.is_field()) {
2206 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2207 }
2208 int klass_ref = cp->uncached_klass_ref_index_at(index);
2209 Klass* k_o;
2210 if (force_resolution) {
2211 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2212 } else {
2213 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2214 if (k_o == NULL) return NULL;
2215 }
2216 InstanceKlass* k = InstanceKlass::cast(k_o);
2217 Symbol* name = cp->uncached_name_ref_at(index);
2218 Symbol* sig = cp->uncached_signature_ref_at(index);
2219 fieldDescriptor fd;
2220 Klass* target_klass = k->find_field(name, sig, &fd);
2221 if (target_klass == NULL) {
2222 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2223 }
2224 oop field = Reflection::new_field(&fd, CHECK_NULL);
2225 return JNIHandles::make_local(THREAD, field);
2226 }
2227
2228 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2229 {
2230 JvmtiVMObjectAllocEventCollector oam;
2231 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2232 bounds_check(cp, index, CHECK_NULL);
2233 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2234 return res;
2235 }
2236 JVM_END
2237
2238 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2239 {
2240 JvmtiVMObjectAllocEventCollector oam;
2241 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2242 bounds_check(cp, index, CHECK_NULL);
2243 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2244 return res;
2245 }
2246 JVM_END
2247
2248 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2249 {
2250 JvmtiVMObjectAllocEventCollector oam;
2251 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2252 bounds_check(cp, index, CHECK_NULL);
2253 constantTag tag = cp->tag_at(index);
2254 if (!tag.is_field_or_method()) {
2255 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2256 }
2257 int klass_ref = cp->uncached_klass_ref_index_at(index);
2258 Symbol* klass_name = cp->klass_name_at(klass_ref);
2259 Symbol* member_name = cp->uncached_name_ref_at(index);
2260 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2261 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2262 objArrayHandle dest(THREAD, dest_o);
2263 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2264 dest->obj_at_put(0, str());
2265 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2266 dest->obj_at_put(1, str());
2267 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2268 dest->obj_at_put(2, str());
2269 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2270 }
2271 JVM_END
2272
2273 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2274 {
2275 JvmtiVMObjectAllocEventCollector oam;
2276 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2277 bounds_check(cp, index, CHECK_0);
2278 constantTag tag = cp->tag_at(index);
2279 if (!tag.is_field_or_method()) {
2280 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2281 }
2282 return (jint) cp->uncached_klass_ref_index_at(index);
2283 }
2284 JVM_END
2285
2286 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2287 {
2288 JvmtiVMObjectAllocEventCollector oam;
2289 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2290 bounds_check(cp, index, CHECK_0);
2291 constantTag tag = cp->tag_at(index);
2292 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2293 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2294 }
2295 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2296 }
2297 JVM_END
2298
2299 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2300 {
2301 JvmtiVMObjectAllocEventCollector oam;
2302 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2303 bounds_check(cp, index, CHECK_NULL);
2304 constantTag tag = cp->tag_at(index);
2305 if (!tag.is_name_and_type()) {
2306 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2307 }
2308 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2309 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2310 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2311 objArrayHandle dest(THREAD, dest_o);
2312 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2313 dest->obj_at_put(0, str());
2314 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2315 dest->obj_at_put(1, str());
2316 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2317 }
2318 JVM_END
2319
2320 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2321 {
2322 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2323 bounds_check(cp, index, CHECK_0);
2324 constantTag tag = cp->tag_at(index);
2325 if (!tag.is_int()) {
2326 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2327 }
2328 return cp->int_at(index);
2329 }
2330 JVM_END
2331
2332 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2333 {
2334 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2335 bounds_check(cp, index, CHECK_(0L));
2336 constantTag tag = cp->tag_at(index);
2337 if (!tag.is_long()) {
2338 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2339 }
2340 return cp->long_at(index);
2341 }
2342 JVM_END
2343
2344 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2345 {
2346 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2347 bounds_check(cp, index, CHECK_(0.0f));
2348 constantTag tag = cp->tag_at(index);
2349 if (!tag.is_float()) {
2350 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2351 }
2352 return cp->float_at(index);
2353 }
2354 JVM_END
2355
2356 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2357 {
2358 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2359 bounds_check(cp, index, CHECK_(0.0));
2360 constantTag tag = cp->tag_at(index);
2361 if (!tag.is_double()) {
2362 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2363 }
2364 return cp->double_at(index);
2365 }
2366 JVM_END
2367
2368 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2369 {
2370 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2371 bounds_check(cp, index, CHECK_NULL);
2372 constantTag tag = cp->tag_at(index);
2373 if (!tag.is_string()) {
2374 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2375 }
2376 oop str = cp->string_at(index, CHECK_NULL);
2377 return (jstring) JNIHandles::make_local(THREAD, str);
2378 }
2379 JVM_END
2380
2381 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2382 {
2383 JvmtiVMObjectAllocEventCollector oam;
2384 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2385 bounds_check(cp, index, CHECK_NULL);
2386 constantTag tag = cp->tag_at(index);
2387 if (!tag.is_symbol()) {
2388 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2389 }
2390 Symbol* sym = cp->symbol_at(index);
2391 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2392 return (jstring) JNIHandles::make_local(THREAD, str());
2393 }
2394 JVM_END
2395
2396 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2397 {
2398 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2399 bounds_check(cp, index, CHECK_0);
2400 constantTag tag = cp->tag_at(index);
2401 jbyte result = tag.value();
2402 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2403 // they are changed to the corresponding tags from the JVM spec, so that java code in
2404 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2405 if (tag.is_klass_or_reference()) {
2406 result = JVM_CONSTANT_Class;
2407 } else if (tag.is_string_index()) {
2408 result = JVM_CONSTANT_String;
2409 } else if (tag.is_method_type_in_error()) {
2410 result = JVM_CONSTANT_MethodType;
2411 } else if (tag.is_method_handle_in_error()) {
2412 result = JVM_CONSTANT_MethodHandle;
2413 } else if (tag.is_dynamic_constant_in_error()) {
2414 result = JVM_CONSTANT_Dynamic;
2415 }
2416 return result;
2417 }
2418 JVM_END
2419
2420 // Assertion support. //////////////////////////////////////////////////////////
2421
2422 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2423 assert(cls != NULL, "bad class");
2424
2425 oop r = JNIHandles::resolve(cls);
2426 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2427 if (java_lang_Class::is_primitive(r)) return false;
2428
2429 Klass* k = java_lang_Class::as_Klass(r);
2430 assert(k->is_instance_klass(), "must be an instance klass");
2431 if (!k->is_instance_klass()) return false;
2432
2433 ResourceMark rm(THREAD);
2434 const char* name = k->name()->as_C_string();
2435 bool system_class = k->class_loader() == NULL;
2436 return JavaAssertions::enabled(name, system_class);
2437
2438 JVM_END
2439
2440
2441 // Return a new AssertionStatusDirectives object with the fields filled in with
2442 // command-line assertion arguments (i.e., -ea, -da).
2443 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2444 JvmtiVMObjectAllocEventCollector oam;
2445 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2446 return JNIHandles::make_local(THREAD, asd);
2447 JVM_END
2448
2449 // Arrays support /////////////////////////////////////////////////////////////
2450
2451 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2452 oop o = JNIHandles::resolve(array);
2453 Klass* k = o->klass();
2454 if ((o == NULL) || (!k->is_array_klass())) {
2455 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2456 }
2457 return ArrayKlass::cast(k)->element_access_is_atomic();
2458 JVM_END
2459
2460 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2461 oop o = JNIHandles::resolve(array);
2462 Klass* k = o->klass();
2463 if ((o == NULL) || (!k->is_array_klass())) {
2464 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2465 }
2466 if (k->is_flatArray_klass()) {
2467 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2468 if (!vk->element_access_is_atomic()) {
2469 /**
2470 * Need to decide how to implement:
2471 *
2472 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2473 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2474 * "checkcast" & "instanceof"
2475 *
2476 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2477 * possibly per instance lock structure. Said info, could be placed in
2478 * "trailer" rather than disturb the current arrayOop
2479 */
2480 Unimplemented();
2481 }
2482 }
2483 return array;
2484 JVM_END
2485
2486 // Verification ////////////////////////////////////////////////////////////////////////////////
2487
2488 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2489
2490 // RedefineClasses support: bug 6214132 caused verification to fail.
2491 // All functions from this section should call the jvmtiThreadSate function:
2492 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2493 // The function returns a Klass* of the _scratch_class if the verifier
2494 // was invoked in the middle of the class redefinition.
2495 // Otherwise it returns its argument value which is the _the_class Klass*.
2496 // Please, refer to the description in the jvmtiThreadSate.hpp.
2497
2498 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2500 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2501 return k->name()->as_utf8();
2502 JVM_END
2503
2504
2505 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2506 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2507 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2508 // types will have length zero if this is not an InstanceKlass
2509 // (length is determined by call to JVM_GetClassCPEntriesCount)
2510 if (k->is_instance_klass()) {
2511 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2512 for (int index = cp->length() - 1; index >= 0; index--) {
2513 constantTag tag = cp->tag_at(index);
2514 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2515 }
2516 }
2517 JVM_END
2518
2519
2520 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2523 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2524 JVM_END
2525
2526
2527 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2530 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2531 JVM_END
2532
2533
2534 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2535 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2536 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2537 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2538 JVM_END
2539
2540
2541 // The following methods, used for the verifier, are never called with
2542 // array klasses, so a direct cast to InstanceKlass is safe.
2543 // Typically, these methods are called in a loop with bounds determined
2544 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2545 // zero for arrays.
2546 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2547 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2548 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2549 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2550 int length = method->checked_exceptions_length();
2551 if (length > 0) {
2552 CheckedExceptionElement* table= method->checked_exceptions_start();
2553 for (int i = 0; i < length; i++) {
2554 exceptions[i] = table[i].class_cp_index;
2555 }
2556 }
2557 JVM_END
2558
2559
2560 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2562 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2563 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2564 return method->checked_exceptions_length();
2565 JVM_END
2566
2567
2568 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2569 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2570 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2571 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2572 memcpy(code, method->code_base(), method->code_size());
2573 JVM_END
2574
2575
2576 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2579 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2580 return method->code_size();
2581 JVM_END
2582
2583
2584 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2586 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2587 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2588 ExceptionTable extable(method);
2589 entry->start_pc = extable.start_pc(entry_index);
2590 entry->end_pc = extable.end_pc(entry_index);
2591 entry->handler_pc = extable.handler_pc(entry_index);
2592 entry->catchType = extable.catch_type_index(entry_index);
2593 JVM_END
2594
2595
2596 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2600 return method->exception_table_length();
2601 JVM_END
2602
2603
2604 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2605 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2606 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2607 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2608 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2609 JVM_END
2610
2611
2612 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2613 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2614 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2615 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2616 JVM_END
2617
2618
2619 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2621 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2622 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2623 return method->max_locals();
2624 JVM_END
2625
2626
2627 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2629 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2630 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2631 return method->size_of_parameters();
2632 JVM_END
2633
2634
2635 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
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->verifier_max_stack();
2640 JVM_END
2641
2642
2643 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2644 ResourceMark rm(THREAD);
2645 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2646 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2647 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2648 return method->is_object_constructor();
2649 JVM_END
2650
2651
2652 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2653 ResourceMark rm(THREAD);
2654 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2655 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2656 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2657 return method->is_overpass();
2658 JVM_END
2659
2660 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2661 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2662 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2663 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2664 return method->name()->as_utf8();
2665 JVM_END
2666
2667
2668 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2669 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2670 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2671 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2672 return method->signature()->as_utf8();
2673 JVM_END
2674
2675 /**
2676 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2677 * read entries in the constant pool. Since the old verifier always
2678 * works on a copy of the code, it will not see any rewriting that
2679 * may possibly occur in the middle of verification. So it is important
2680 * that nothing it calls tries to use the cpCache instead of the raw
2681 * constant pool, so we must use cp->uncached_x methods when appropriate.
2682 */
2683 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2684 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2685 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2686 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2687 switch (cp->tag_at(cp_index).value()) {
2688 case JVM_CONSTANT_Fieldref:
2689 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2690 default:
2691 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2692 }
2693 ShouldNotReachHere();
2694 return NULL;
2695 JVM_END
2696
2697
2698 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2699 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2700 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2701 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2702 switch (cp->tag_at(cp_index).value()) {
2703 case JVM_CONSTANT_InterfaceMethodref:
2704 case JVM_CONSTANT_Methodref:
2705 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2706 default:
2707 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2708 }
2709 ShouldNotReachHere();
2710 return NULL;
2711 JVM_END
2712
2713
2714 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2715 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2716 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2717 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2718 switch (cp->tag_at(cp_index).value()) {
2719 case JVM_CONSTANT_InterfaceMethodref:
2720 case JVM_CONSTANT_Methodref:
2721 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2722 default:
2723 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2724 }
2725 ShouldNotReachHere();
2726 return NULL;
2727 JVM_END
2728
2729
2730 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2731 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2732 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2733 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2734 switch (cp->tag_at(cp_index).value()) {
2735 case JVM_CONSTANT_Fieldref:
2736 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2737 default:
2738 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2739 }
2740 ShouldNotReachHere();
2741 return NULL;
2742 JVM_END
2743
2744
2745 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2746 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2747 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2748 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2749 Symbol* classname = cp->klass_name_at(cp_index);
2750 return classname->as_utf8();
2751 JVM_END
2752
2753
2754 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(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_Fieldref: {
2760 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2761 Symbol* classname = cp->klass_name_at(class_index);
2762 return classname->as_utf8();
2763 }
2764 default:
2765 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2766 }
2767 ShouldNotReachHere();
2768 return NULL;
2769 JVM_END
2770
2771
2772 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2773 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2774 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2775 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2776 switch (cp->tag_at(cp_index).value()) {
2777 case JVM_CONSTANT_Methodref:
2778 case JVM_CONSTANT_InterfaceMethodref: {
2779 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2780 Symbol* classname = cp->klass_name_at(class_index);
2781 return classname->as_utf8();
2782 }
2783 default:
2784 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2785 }
2786 ShouldNotReachHere();
2787 return NULL;
2788 JVM_END
2789
2790
2791 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2792 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2793 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2794 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2795 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2796 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2797 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2798 switch (cp->tag_at(cp_index).value()) {
2799 case JVM_CONSTANT_Fieldref: {
2800 Symbol* name = cp->uncached_name_ref_at(cp_index);
2801 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2802 InstanceKlass* ik = InstanceKlass::cast(k_called);
2803 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2804 if (fs.name() == name && fs.signature() == signature) {
2805 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2806 }
2807 }
2808 return -1;
2809 }
2810 default:
2811 fatal("JVM_GetCPFieldModifiers: illegal constant");
2812 }
2813 ShouldNotReachHere();
2814 return 0;
2815 JVM_END
2816
2817
2818 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2819 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2820 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2821 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2822 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2823 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2824 switch (cp->tag_at(cp_index).value()) {
2825 case JVM_CONSTANT_Methodref:
2826 case JVM_CONSTANT_InterfaceMethodref: {
2827 Symbol* name = cp->uncached_name_ref_at(cp_index);
2828 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2829 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2830 int methods_count = methods->length();
2831 for (int i = 0; i < methods_count; i++) {
2832 Method* method = methods->at(i);
2833 if (method->name() == name && method->signature() == signature) {
2834 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2835 }
2836 }
2837 return -1;
2838 }
2839 default:
2840 fatal("JVM_GetCPMethodModifiers: illegal constant");
2841 }
2842 ShouldNotReachHere();
2843 return 0;
2844 JVM_END
2845
2846
2847 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2848
2849 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2850 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2851 JVM_END
2852
2853
2854 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2855 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2856 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2857 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2858 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2859 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2860 JVM_END
2861
2862 // Printing support //////////////////////////////////////////////////
2863 extern "C" {
2864
2865 ATTRIBUTE_PRINTF(3, 0)
2866 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2867 // Reject count values that are negative signed values converted to
2868 // unsigned; see bug 4399518, 4417214
2869 if ((intptr_t)count <= 0) return -1;
2870
2871 int result = os::vsnprintf(str, count, fmt, args);
2872 if (result > 0 && (size_t)result >= count) {
2873 result = -1;
2874 }
2875
2876 return result;
2877 }
2878
2879 ATTRIBUTE_PRINTF(3, 4)
2880 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2881 va_list args;
2882 int len;
2883 va_start(args, fmt);
2884 len = jio_vsnprintf(str, count, fmt, args);
2885 va_end(args);
2886 return len;
2887 }
2888
2889 ATTRIBUTE_PRINTF(2, 3)
2890 int jio_fprintf(FILE* f, const char *fmt, ...) {
2891 int len;
2892 va_list args;
2893 va_start(args, fmt);
2894 len = jio_vfprintf(f, fmt, args);
2895 va_end(args);
2896 return len;
2897 }
2898
2899 ATTRIBUTE_PRINTF(2, 0)
2900 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2901 if (Arguments::vfprintf_hook() != NULL) {
2902 return Arguments::vfprintf_hook()(f, fmt, args);
2903 } else {
2904 return vfprintf(f, fmt, args);
2905 }
2906 }
2907
2908 ATTRIBUTE_PRINTF(1, 2)
2909 JNIEXPORT int jio_printf(const char *fmt, ...) {
2910 int len;
2911 va_list args;
2912 va_start(args, fmt);
2913 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2914 va_end(args);
2915 return len;
2916 }
2917
2918 // HotSpot specific jio method
2919 void jio_print(const char* s, size_t len) {
2920 // Try to make this function as atomic as possible.
2921 if (Arguments::vfprintf_hook() != NULL) {
2922 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2923 } else {
2924 // Make an unused local variable to avoid warning from gcc compiler.
2925 ssize_t count = os::write(defaultStream::output_fd(), s, (int)len);
2926 }
2927 }
2928
2929 } // Extern C
2930
2931 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2932
2933 // In most of the JVM thread support functions we need to access the
2934 // thread through a ThreadsListHandle to prevent it from exiting and
2935 // being reclaimed while we try to operate on it. The exceptions to this
2936 // rule are when operating on the current thread, or if the monitor of
2937 // the target java.lang.Thread is locked at the Java level - in both
2938 // cases the target cannot exit.
2939
2940 static void thread_entry(JavaThread* thread, TRAPS) {
2941 HandleMark hm(THREAD);
2942 Handle obj(THREAD, thread->threadObj());
2943 JavaValue result(T_VOID);
2944 JavaCalls::call_virtual(&result,
2945 obj,
2946 vmClasses::Thread_klass(),
2947 vmSymbols::run_method_name(),
2948 vmSymbols::void_method_signature(),
2949 THREAD);
2950 }
2951
2952
2953 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2954 #if INCLUDE_CDS
2955 if (DumpSharedSpaces) {
2956 // During java -Xshare:dump, if we allow multiple Java threads to
2957 // execute in parallel, symbols and classes may be loaded in
2958 // random orders which will make the resulting CDS archive
2959 // non-deterministic.
2960 //
2961 // Lucikly, during java -Xshare:dump, it's important to run only
2962 // the code in the main Java thread (which is NOT started here) that
2963 // creates the module graph, etc. It's safe to not start the other
2964 // threads which are launched by class static initializers
2965 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2966 if (log_is_enabled(Info, cds)) {
2967 ResourceMark rm;
2968 oop t = JNIHandles::resolve_non_null(jthread);
2969 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2970 }
2971 return;
2972 }
2973 #endif
2974 JavaThread *native_thread = NULL;
2975
2976 // We cannot hold the Threads_lock when we throw an exception,
2977 // due to rank ordering issues. Example: we might need to grab the
2978 // Heap_lock while we construct the exception.
2979 bool throw_illegal_thread_state = false;
2980
2981 // We must release the Threads_lock before we can post a jvmti event
2982 // in Thread::start.
2983 {
2984 // Ensure that the C++ Thread and OSThread structures aren't freed before
2985 // we operate.
2986 MutexLocker mu(Threads_lock);
2987
2988 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2989 // re-starting an already started thread, so we should usually find
2990 // that the JavaThread is null. However for a JNI attached thread
2991 // there is a small window between the Thread object being created
2992 // (with its JavaThread set) and the update to its threadStatus, so we
2993 // have to check for this
2994 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2995 throw_illegal_thread_state = true;
2996 } else {
2997 jlong size =
2998 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2999 // Allocate the C++ Thread structure and create the native thread. The
3000 // stack size retrieved from java is 64-bit signed, but the constructor takes
3001 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3002 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3003 // - Avoid passing negative values which would result in really large stacks.
3004 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3005 size_t sz = size > 0 ? (size_t) size : 0;
3006 native_thread = new JavaThread(&thread_entry, sz);
3007
3008 // At this point it may be possible that no osthread was created for the
3009 // JavaThread due to lack of memory. Check for this situation and throw
3010 // an exception if necessary. Eventually we may want to change this so
3011 // that we only grab the lock if the thread was created successfully -
3012 // then we can also do this check and throw the exception in the
3013 // JavaThread constructor.
3014 if (native_thread->osthread() != NULL) {
3015 // Note: the current thread is not being used within "prepare".
3016 native_thread->prepare(jthread);
3017 }
3018 }
3019 }
3020
3021 if (throw_illegal_thread_state) {
3022 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3023 }
3024
3025 assert(native_thread != NULL, "Starting null thread?");
3026
3027 if (native_thread->osthread() == NULL) {
3028 ResourceMark rm(thread);
3029 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3030 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3031 // No one should hold a reference to the 'native_thread'.
3032 native_thread->smr_delete();
3033 if (JvmtiExport::should_post_resource_exhausted()) {
3034 JvmtiExport::post_resource_exhausted(
3035 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3036 os::native_thread_creation_failed_msg());
3037 }
3038 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3039 os::native_thread_creation_failed_msg());
3040 }
3041
3042 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3043
3044 Thread::start(native_thread);
3045
3046 JVM_END
3047
3048
3049 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3050 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3051 return java_lang_Thread::is_alive(thread_oop);
3052 JVM_END
3053
3054
3055 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3056 ThreadsListHandle tlh(thread);
3057 oop java_thread = NULL;
3058 JavaThread* receiver = NULL;
3059 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3060 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3061
3062 if (is_alive) {
3063 // jthread refers to a live JavaThread.
3064 Thread::set_priority(receiver, (ThreadPriority)prio);
3065 }
3066 // Implied else: If the JavaThread hasn't started yet, then the
3067 // priority set in the java.lang.Thread object above will be pushed
3068 // down when it does start.
3069 JVM_END
3070
3071
3072 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3073 if (os::dont_yield()) return;
3074 HOTSPOT_THREAD_YIELD();
3075 os::naked_yield();
3076 JVM_END
3077
3078 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3079 if (millis < 0) {
3080 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3081 }
3082
3083 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3084 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3085 }
3086
3087 // Save current thread state and restore it at the end of this block.
3088 // And set new thread state to SLEEPING.
3089 JavaThreadSleepState jtss(thread);
3090
3091 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3092
3093 if (millis == 0) {
3094 os::naked_yield();
3095 } else {
3096 ThreadState old_state = thread->osthread()->get_state();
3097 thread->osthread()->set_state(SLEEPING);
3098 if (!thread->sleep(millis)) { // interrupted
3099 // An asynchronous exception could have been thrown on
3100 // us while we were sleeping. We do not overwrite those.
3101 if (!HAS_PENDING_EXCEPTION) {
3102 HOTSPOT_THREAD_SLEEP_END(1);
3103
3104 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3105 // to properly restore the thread state. That's likely wrong.
3106 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3107 }
3108 }
3109 thread->osthread()->set_state(old_state);
3110 }
3111 HOTSPOT_THREAD_SLEEP_END(0);
3112 JVM_END
3113
3114 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3115 oop jthread = thread->threadObj();
3116 assert(jthread != NULL, "no current carrier thread!");
3117 return JNIHandles::make_local(THREAD, jthread);
3118 JVM_END
3119
3120 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3121 oop theThread = thread->vthread();
3122 assert(theThread != (oop)NULL, "no current thread!");
3123 return JNIHandles::make_local(THREAD, theThread);
3124 JVM_END
3125
3126 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3127 jobject theThread))
3128 oop threadObj = JNIHandles::resolve(theThread);
3129 thread->set_vthread(threadObj);
3130 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3131 JVM_END
3132
3133 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3134 return ThreadIdentifier::unsafe_offset();
3135 JVM_END
3136
3137 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3138 ThreadsListHandle tlh(thread);
3139 JavaThread* receiver = NULL;
3140 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3141 if (is_alive) {
3142 // jthread refers to a live JavaThread.
3143 receiver->interrupt();
3144 }
3145 JVM_END
3146
3147 // Return true iff the current thread has locked the object passed in
3148
3149 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3150 if (obj == NULL) {
3151 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3152 }
3153 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3154 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3155 JVM_END
3156
3157 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3158 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3159 return JNIHandles::make_local(THREAD, trace);
3160 JVM_END
3161
3162 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3163 VM_PrintThreads op;
3164 VMThread::execute(&op);
3165 if (JvmtiExport::should_post_data_dump()) {
3166 JvmtiExport::post_data_dump();
3167 }
3168 JVM_END
3169
3170 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3171 // We don't use a ThreadsListHandle here because the current thread
3172 // must be alive.
3173 oop java_thread = JNIHandles::resolve_non_null(jthread);
3174 JavaThread* thr = java_lang_Thread::thread(java_thread);
3175 if (thread == thr && !thr->has_attached_via_jni()) {
3176 // Thread naming is only supported for the current thread and
3177 // we don't set the name of an attached thread to avoid stepping
3178 // on other programs.
3179 ResourceMark rm(thread);
3180 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3181 os::set_native_thread_name(thread_name);
3182 }
3183 JVM_END
3184
3185 JVM_ENTRY(jobject, JVM_ExtentLocalCache(JNIEnv* env, jclass threadClass))
3186 oop theCache = thread->extentLocalCache();
3187 if (theCache) {
3188 arrayOop objs = arrayOop(theCache);
3189 assert(objs->length() == ExtentLocalCacheSize * 2, "wrong length");
3190 }
3191 return JNIHandles::make_local(THREAD, theCache);
3192 JVM_END
3193
3194 JVM_ENTRY(void, JVM_SetExtentLocalCache(JNIEnv* env, jclass threadClass,
3195 jobject theCache))
3196 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3197 if (objs != NULL) {
3198 assert(objs->length() == ExtentLocalCacheSize * 2, "wrong length");
3199 }
3200 thread->set_extentLocalCache(objs);
3201 JVM_END
3202
3203 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3204
3205 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3206 ResourceMark rm(THREAD);
3207 JvmtiVMObjectAllocEventCollector oam;
3208 vframeStream vfst(thread);
3209
3210 if (vmClasses::reflect_CallerSensitive_klass() != NULL) {
3211 // This must only be called from SecurityManager.getClassContext
3212 Method* m = vfst.method();
3213 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3214 m->name() == vmSymbols::getClassContext_name() &&
3215 m->signature() == vmSymbols::void_class_array_signature())) {
3216 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3217 }
3218 }
3219
3220 // Collect method holders
3221 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3222 for (; !vfst.at_end(); vfst.security_next()) {
3223 Method* m = vfst.method();
3224 // Native frames are not returned
3225 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3226 Klass* holder = m->method_holder();
3227 assert(holder->is_klass(), "just checking");
3228 klass_array->append(holder);
3229 }
3230 }
3231
3232 // Create result array of type [Ljava/lang/Class;
3233 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3234 // Fill in mirrors corresponding to method holders
3235 for (int i = 0; i < klass_array->length(); i++) {
3236 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3237 }
3238
3239 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3240 JVM_END
3241
3242
3243 // java.lang.Package ////////////////////////////////////////////////////////////////
3244
3245
3246 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3247 ResourceMark rm(THREAD);
3248 JvmtiVMObjectAllocEventCollector oam;
3249 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3250 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3251 return (jstring) JNIHandles::make_local(THREAD, result);
3252 JVM_END
3253
3254
3255 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3256 JvmtiVMObjectAllocEventCollector oam;
3257 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3258 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3259 JVM_END
3260
3261
3262 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3263
3264
3265 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3266 MonitorLocker ml(Heap_lock);
3267 oop ref = Universe::reference_pending_list();
3268 if (ref != NULL) {
3269 Universe::clear_reference_pending_list();
3270 }
3271 return JNIHandles::make_local(THREAD, ref);
3272 JVM_END
3273
3274 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3275 MonitorLocker ml(Heap_lock);
3276 return Universe::has_reference_pending_list();
3277 JVM_END
3278
3279 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3280 MonitorLocker ml(Heap_lock);
3281 while (!Universe::has_reference_pending_list()) {
3282 ml.wait();
3283 }
3284 JVM_END
3285
3286 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3287 oop ref_oop = JNIHandles::resolve_non_null(ref);
3288 // PhantomReference has it's own implementation of refersTo().
3289 // See: JVM_PhantomReferenceRefersTo
3290 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3291 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3292 return referent == JNIHandles::resolve(o);
3293 JVM_END
3294
3295 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3296 oop ref_oop = JNIHandles::resolve_non_null(ref);
3297 // FinalReference has it's own implementation of clear().
3298 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3299 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == NULL) {
3300 // If the referent has already been cleared then done.
3301 // However, if the referent is dead but has not yet been cleared by
3302 // concurrent reference processing, it should NOT be cleared here.
3303 // Instead, clearing should be left to the GC. Clearing it here could
3304 // detectably lose an expected notification, which is impossible with
3305 // STW reference processing. The clearing in enqueue() doesn't have
3306 // this problem, since the enqueue covers the notification, but it's not
3307 // worth the effort to handle that case specially.
3308 return;
3309 }
3310 java_lang_ref_Reference::clear_referent(ref_oop);
3311 JVM_END
3312
3313
3314 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3315
3316
3317 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3318 oop ref_oop = JNIHandles::resolve_non_null(ref);
3319 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3320 return referent == JNIHandles::resolve(o);
3321 JVM_END
3322
3323
3324 // ObjectInputStream ///////////////////////////////////////////////////////////////
3325
3326 // Return the first user-defined class loader up the execution stack, or null
3327 // if only code from the bootstrap or platform class loader is on the stack.
3328
3329 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3330 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3331 InstanceKlass* ik = vfst.method()->method_holder();
3332 oop loader = ik->class_loader();
3333 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3334 // Skip reflection related frames
3335 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3336 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3337 return JNIHandles::make_local(THREAD, loader);
3338 }
3339 }
3340 }
3341 return NULL;
3342 JVM_END
3343
3344
3345 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3346
3347
3348 // resolve array handle and check arguments
3349 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3350 if (arr == NULL) {
3351 THROW_0(vmSymbols::java_lang_NullPointerException());
3352 }
3353 oop a = JNIHandles::resolve_non_null(arr);
3354 if (!a->is_array()) {
3355 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3356 } else if (type_array_only && !a->is_typeArray()) {
3357 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3358 }
3359 return arrayOop(a);
3360 }
3361
3362
3363 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3364 arrayOop a = check_array(env, arr, false, CHECK_0);
3365 return a->length();
3366 JVM_END
3367
3368
3369 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3370 JvmtiVMObjectAllocEventCollector oam;
3371 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3372 jvalue value;
3373 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3374 oop box = Reflection::box(&value, type, CHECK_NULL);
3375 return JNIHandles::make_local(THREAD, box);
3376 JVM_END
3377
3378
3379 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3380 jvalue value;
3381 value.i = 0; // to initialize value before getting used in CHECK
3382 arrayOop a = check_array(env, arr, true, CHECK_(value));
3383 assert(a->is_typeArray(), "just checking");
3384 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3385 BasicType wide_type = (BasicType) wCode;
3386 if (type != wide_type) {
3387 Reflection::widen(&value, type, wide_type, CHECK_(value));
3388 }
3389 return value;
3390 JVM_END
3391
3392
3393 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3394 arrayOop a = check_array(env, arr, false, CHECK);
3395 oop box = JNIHandles::resolve(val);
3396 jvalue value;
3397 value.i = 0; // to initialize value before getting used in CHECK
3398 BasicType value_type;
3399 if (a->is_objArray()) {
3400 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3401 value_type = Reflection::unbox_for_regular_object(box, &value);
3402 } else {
3403 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3404 }
3405 Reflection::array_set(&value, a, index, value_type, CHECK);
3406 JVM_END
3407
3408
3409 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3410 arrayOop a = check_array(env, arr, true, CHECK);
3411 assert(a->is_typeArray(), "just checking");
3412 BasicType value_type = (BasicType) vCode;
3413 Reflection::array_set(&v, a, index, value_type, CHECK);
3414 JVM_END
3415
3416
3417 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3418 JvmtiVMObjectAllocEventCollector oam;
3419 oop element_mirror = JNIHandles::resolve(eltClass);
3420 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3421 return JNIHandles::make_local(THREAD, result);
3422 JVM_END
3423
3424
3425 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3426 JvmtiVMObjectAllocEventCollector oam;
3427 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3428 oop element_mirror = JNIHandles::resolve(eltClass);
3429 assert(dim_array->is_typeArray(), "just checking");
3430 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3431 return JNIHandles::make_local(THREAD, result);
3432 JVM_END
3433
3434
3435 // Library support ///////////////////////////////////////////////////////////////////////////
3436
3437 JVM_LEAF(void*, JVM_LoadZipLibrary())
3438 ClassLoader::load_zip_library_if_needed();
3439 return ClassLoader::zip_library_handle();
3440 JVM_END
3441
3442 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3443 //%note jvm_ct
3444 char ebuf[1024];
3445 void *load_result;
3446 {
3447 ThreadToNativeFromVM ttnfvm(thread);
3448 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3449 }
3450 if (load_result == NULL) {
3451 if (throwException) {
3452 char msg[1024];
3453 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3454 // Since 'ebuf' may contain a string encoded using
3455 // platform encoding scheme, we need to pass
3456 // Exceptions::unsafe_to_utf8 to the new_exception method
3457 // as the last argument. See bug 6367357.
3458 Handle h_exception =
3459 Exceptions::new_exception(thread,
3460 vmSymbols::java_lang_UnsatisfiedLinkError(),
3461 msg, Exceptions::unsafe_to_utf8);
3462
3463 THROW_HANDLE_0(h_exception);
3464 } else {
3465 log_info(library)("Failed to load library %s", name);
3466 return load_result;
3467 }
3468 }
3469 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3470 return load_result;
3471 JVM_END
3472
3473
3474 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3475 os::dll_unload(handle);
3476 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3477 JVM_END
3478
3479
3480 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3481 void* find_result = os::dll_lookup(handle, name);
3482 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3483 find_result != NULL ? "Found" : "Failed to find",
3484 name, p2i(handle));
3485 return find_result;
3486 JVM_END
3487
3488
3489 // JNI version ///////////////////////////////////////////////////////////////////////////////
3490
3491 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3492 return Threads::is_supported_jni_version_including_1_1(version);
3493 JVM_END
3494
3495
3496 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3497 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3498 JVM_END
3499
3500 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3501 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3502 JVM_END
3503
3504 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3505 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3506 JVM_END
3507
3508 // String support ///////////////////////////////////////////////////////////////////////////
3509
3510 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3511 JvmtiVMObjectAllocEventCollector oam;
3512 if (str == NULL) return NULL;
3513 oop string = JNIHandles::resolve_non_null(str);
3514 oop result = StringTable::intern(string, CHECK_NULL);
3515 return (jstring) JNIHandles::make_local(THREAD, result);
3516 JVM_END
3517
3518
3519 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3520
3521 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3522 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3523 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3524 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3525 // nature. JavaThreads will be "in native" when using this API from JDK code.
3526
3527
3528 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3529 VM_Exit::block_if_vm_exited();
3530 return new PlatformMutex();
3531 }
3532
3533
3534 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3535 VM_Exit::block_if_vm_exited();
3536 delete ((PlatformMutex*) mon);
3537 }
3538
3539
3540 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3541 VM_Exit::block_if_vm_exited();
3542 ((PlatformMutex*) mon)->lock();
3543 return 0;
3544 }
3545
3546
3547 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3548 VM_Exit::block_if_vm_exited();
3549 ((PlatformMutex*) mon)->unlock();
3550 }
3551
3552
3553 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3554
3555 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3556 Handle loader, Handle protection_domain,
3557 jboolean throwError, TRAPS) {
3558 // Security Note:
3559 // The Java level wrapper will perform the necessary security check allowing
3560 // us to pass the NULL as the initiating class loader. The VM is responsible for
3561 // the checkPackageAccess relative to the initiating class loader via the
3562 // protection_domain. The protection_domain is passed as NULL by the java code
3563 // if there is no security manager in 3-arg Class.forName().
3564 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3565
3566 // Check if we should initialize the class
3567 if (init && klass->is_instance_klass()) {
3568 klass->initialize(CHECK_NULL);
3569 }
3570 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3571 }
3572
3573
3574 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3575
3576 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3577 Handle method_handle;
3578 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3579 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3580 Handle receiver(THREAD, JNIHandles::resolve(obj));
3581 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3582 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3583 jobject res = JNIHandles::make_local(THREAD, result);
3584 if (JvmtiExport::should_post_vm_object_alloc()) {
3585 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3586 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3587 if (java_lang_Class::is_primitive(ret_type)) {
3588 // Only for primitive type vm allocates memory for java object.
3589 // See box() method.
3590 JvmtiExport::post_vm_object_alloc(thread, result);
3591 }
3592 }
3593 return res;
3594 } else {
3595 THROW_0(vmSymbols::java_lang_StackOverflowError());
3596 }
3597 JVM_END
3598
3599
3600 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3601 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3602 oop constructor_mirror = JNIHandles::resolve(c);
3603 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3604 jobject res = JNIHandles::make_local(THREAD, result);
3605 if (JvmtiExport::should_post_vm_object_alloc()) {
3606 JvmtiExport::post_vm_object_alloc(thread, result);
3607 }
3608 return res;
3609 JVM_END
3610
3611 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3612
3613 JVM_LEAF(jboolean, JVM_SupportsCX8())
3614 return VM_Version::supports_cx8();
3615 JVM_END
3616
3617 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3619 assert(k->is_klass(), "just checking");
3620 HeapShared::initialize_from_archived_subgraph(k, THREAD);
3621 JVM_END
3622
3623 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3624 jclass caller,
3625 jstring interfaceMethodName,
3626 jobject factoryType,
3627 jobject interfaceMethodType,
3628 jobject implementationMember,
3629 jobject dynamicMethodType,
3630 jclass lambdaProxyClass))
3631 #if INCLUDE_CDS
3632 if (!Arguments::is_dumping_archive()) {
3633 return;
3634 }
3635
3636 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3637 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3638 if (caller_ik->is_hidden()) {
3639 // Hidden classes not of type lambda proxy classes are currently not being archived.
3640 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3641 // registered for archiving.
3642 return;
3643 }
3644 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3645 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3646 assert(lambda_ik->is_hidden(), "must be a hidden class");
3647 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3648
3649 Symbol* interface_method_name = NULL;
3650 if (interfaceMethodName != NULL) {
3651 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3652 }
3653 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3654 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3655
3656 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3657 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3658
3659 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3660 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3661 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3662
3663 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3664 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3665
3666 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3667 interface_method_type, m, dynamic_method_type, THREAD);
3668 #endif // INCLUDE_CDS
3669 JVM_END
3670
3671 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3672 jclass caller,
3673 jstring interfaceMethodName,
3674 jobject factoryType,
3675 jobject interfaceMethodType,
3676 jobject implementationMember,
3677 jobject dynamicMethodType))
3678 #if INCLUDE_CDS
3679
3680 if (interfaceMethodName == NULL || factoryType == NULL || interfaceMethodType == NULL ||
3681 implementationMember == NULL || dynamicMethodType == NULL) {
3682 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3683 }
3684
3685 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3686 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3687 if (!caller_ik->is_shared()) {
3688 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3689 return NULL;
3690 }
3691
3692 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3693 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3694 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3695
3696 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3697 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3698
3699 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3700 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3701 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3702
3703 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3704 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3705
3706 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3707 interface_method_type, m, dynamic_method_type);
3708 jclass jcls = NULL;
3709 if (lambda_ik != NULL) {
3710 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3711 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3712 }
3713 return jcls;
3714 #else
3715 return NULL;
3716 #endif // INCLUDE_CDS
3717 JVM_END
3718
3719 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3720 return Arguments::is_dumping_archive();
3721 JVM_END
3722
3723 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3724 return UseSharedSpaces;
3725 JVM_END
3726
3727 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3728 if (DumpSharedSpaces) {
3729 const char* release = VM_Version::vm_release();
3730 const char* dbg_level = VM_Version::jdk_debug_level();
3731 const char* version = VM_Version::internal_vm_info_string();
3732 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3733 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3734 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3735 seed += (jlong)VM_Version::vm_major_version();
3736 seed += (jlong)VM_Version::vm_minor_version();
3737 seed += (jlong)VM_Version::vm_security_version();
3738 seed += (jlong)VM_Version::vm_patch_version();
3739 if (seed == 0) { // don't let this ever be zero.
3740 seed = 0x87654321;
3741 }
3742 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3743 return seed;
3744 } else {
3745 return 0;
3746 }
3747 JVM_END
3748
3749 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3750 #if INCLUDE_CDS
3751 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3752 #else
3753 return false;
3754 #endif // INCLUDE_CDS
3755 JVM_END
3756
3757 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3758 #if INCLUDE_CDS
3759 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3760 if (line != NULL) {
3761 ResourceMark rm(THREAD);
3762 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3763 char* c_line = java_lang_String::as_utf8_string(h_line());
3764 if (DynamicDumpSharedSpaces) {
3765 // Note: LambdaFormInvokers::append take same format which is not
3766 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3767 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3768 }
3769 if (ClassListWriter::is_enabled()) {
3770 ClassListWriter w;
3771 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3772 }
3773 }
3774 #endif // INCLUDE_CDS
3775 JVM_END
3776
3777 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3778 #if INCLUDE_CDS
3779 ResourceMark rm(THREAD);
3780 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3781 char* file_name = java_lang_String::as_utf8_string(file_handle());
3782 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3783 #endif // INCLUDE_CDS
3784 JVM_END
3785
3786 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3787 #if INCLUDE_CDS
3788 ResourceMark rm(THREAD);
3789 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3790 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3791 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3792 #endif // INCLUDE_CDS
3793 JVM_END
3794
3795 // Returns an array of all live Thread objects (VM internal JavaThreads,
3796 // jvmti agent threads, and JNI attaching threads are skipped)
3797 // See CR 6404306 regarding JNI attaching threads
3798 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3799 ResourceMark rm(THREAD);
3800 ThreadsListEnumerator tle(THREAD, false, false);
3801 JvmtiVMObjectAllocEventCollector oam;
3802
3803 int num_threads = tle.num_threads();
3804 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3805 objArrayHandle threads_ah(THREAD, r);
3806
3807 for (int i = 0; i < num_threads; i++) {
3808 Handle h = tle.get_threadObj(i);
3809 threads_ah->obj_at_put(i, h());
3810 }
3811
3812 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3813 JVM_END
3814
3815
3816 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3817 // Return StackTraceElement[][], each element is the stack trace of a thread in
3818 // the corresponding entry in the given threads array
3819 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3820 JvmtiVMObjectAllocEventCollector oam;
3821
3822 // Check if threads is null
3823 if (threads == NULL) {
3824 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3825 }
3826
3827 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3828 objArrayHandle ah(THREAD, a);
3829 int num_threads = ah->length();
3830 // check if threads is non-empty array
3831 if (num_threads == 0) {
3832 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3833 }
3834
3835 // check if threads is not an array of objects of Thread class
3836 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3837 if (k != vmClasses::Thread_klass()) {
3838 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3839 }
3840
3841 ResourceMark rm(THREAD);
3842
3843 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3844 for (int i = 0; i < num_threads; i++) {
3845 oop thread_obj = ah->obj_at(i);
3846 instanceHandle h(THREAD, (instanceOop) thread_obj);
3847 thread_handle_array->append(h);
3848 }
3849
3850 // The JavaThread references in thread_handle_array are validated
3851 // in VM_ThreadDump::doit().
3852 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3853 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3854
3855 JVM_END
3856
3857 // JVM monitoring and management support
3858 JVM_LEAF(void*, JVM_GetManagement(jint version))
3859 return Management::get_jmm_interface(version);
3860 JVM_END
3861
3862 // com.sun.tools.attach.VirtualMachine agent properties support
3863 //
3864 // Initialize the agent properties with the properties maintained in the VM
3865 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3866 ResourceMark rm;
3867
3868 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3869
3870 PUTPROP(props, "sun.java.command", Arguments::java_command());
3871 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3872 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3873 return properties;
3874 JVM_END
3875
3876 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3877 {
3878 JvmtiVMObjectAllocEventCollector oam;
3879
3880 if (ofClass == NULL) {
3881 return NULL;
3882 }
3883 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3884 // Special handling for primitive objects
3885 if (java_lang_Class::is_primitive(mirror())) {
3886 return NULL;
3887 }
3888 Klass* k = java_lang_Class::as_Klass(mirror());
3889 if (!k->is_instance_klass()) {
3890 return NULL;
3891 }
3892 InstanceKlass* ik = InstanceKlass::cast(k);
3893 int encl_method_class_idx = ik->enclosing_method_class_index();
3894 if (encl_method_class_idx == 0) {
3895 return NULL;
3896 }
3897 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3898 objArrayHandle dest(THREAD, dest_o);
3899 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3900 dest->obj_at_put(0, enc_k->java_mirror());
3901 int encl_method_method_idx = ik->enclosing_method_method_index();
3902 if (encl_method_method_idx != 0) {
3903 Symbol* sym = ik->constants()->symbol_at(
3904 extract_low_short_from_int(
3905 ik->constants()->name_and_type_at(encl_method_method_idx)));
3906 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3907 dest->obj_at_put(1, str());
3908 sym = ik->constants()->symbol_at(
3909 extract_high_short_from_int(
3910 ik->constants()->name_and_type_at(encl_method_method_idx)));
3911 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3912 dest->obj_at_put(2, str());
3913 }
3914 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3915 }
3916 JVM_END
3917
3918 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3919 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3920 ResourceMark rm(THREAD);
3921
3922 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3923 return NULL;
3924 }
3925
3926 char** vm_flags = Arguments::jvm_flags_array();
3927 char** vm_args = Arguments::jvm_args_array();
3928 int num_flags = Arguments::num_jvm_flags();
3929 int num_args = Arguments::num_jvm_args();
3930
3931 InstanceKlass* ik = vmClasses::String_klass();
3932 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3933 objArrayHandle result_h(THREAD, r);
3934
3935 int index = 0;
3936 for (int j = 0; j < num_flags; j++, index++) {
3937 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3938 result_h->obj_at_put(index, h());
3939 }
3940 for (int i = 0; i < num_args; i++, index++) {
3941 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3942 result_h->obj_at_put(index, h());
3943 }
3944 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3945 JVM_END
3946
3947 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3948 return os::get_signal_number(name);
3949 JVM_END
3950
3951 JVM_ENTRY(void, JVM_VirtualThreadMountBegin(JNIEnv* env, jobject vthread, jboolean first_mount))
3952 #if INCLUDE_JVMTI
3953 if (!DoJVMTIVirtualThreadTransitions) {
3954 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3955 return;
3956 }
3957 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
3958 assert(!thread->is_in_VTMS_transition(), "sanity check");
3959 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ true);
3960 #else
3961 fatal("Should only be called with JVMTI enabled");
3962 #endif
3963 JVM_END
3964
3965 JVM_ENTRY(void, JVM_VirtualThreadMountEnd(JNIEnv* env, jobject vthread, jboolean first_mount))
3966 #if INCLUDE_JVMTI
3967 if (!DoJVMTIVirtualThreadTransitions) {
3968 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3969 return;
3970 }
3971 oop vt = JNIHandles::resolve(vthread);
3972
3973 thread->rebind_to_jvmti_thread_state_of(vt);
3974
3975 {
3976 MutexLocker mu(JvmtiThreadState_lock);
3977 JvmtiThreadState* state = thread->jvmti_thread_state();
3978 if (state != NULL && state->is_pending_interp_only_mode()) {
3979 JvmtiEventController::enter_interp_only_mode();
3980 }
3981 }
3982 assert(thread->is_in_VTMS_transition(), "sanity check");
3983 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
3984 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ true);
3985 if (first_mount) {
3986 // thread start
3987 if (JvmtiExport::can_support_virtual_threads()) {
3988 JvmtiEventController::thread_started(thread);
3989 if (JvmtiExport::should_post_vthread_start()) {
3990 JvmtiExport::post_vthread_start(vthread);
3991 }
3992 } else { // compatibility for vthread unaware agents: legacy thread_start
3993 if (PostVirtualThreadCompatibleLifecycleEvents &&
3994 JvmtiExport::should_post_thread_life()) {
3995 // JvmtiEventController::thread_started is called here
3996 JvmtiExport::post_thread_start(thread);
3997 }
3998 }
3999 }
4000 if (JvmtiExport::should_post_vthread_mount()) {
4001 JvmtiExport::post_vthread_mount(vthread);
4002 }
4003 #else
4004 fatal("Should only be called with JVMTI enabled");
4005 #endif
4006 JVM_END
4007
4008 JVM_ENTRY(void, JVM_VirtualThreadUnmountBegin(JNIEnv* env, jobject vthread, jboolean last_unmount))
4009 #if INCLUDE_JVMTI
4010 if (!DoJVMTIVirtualThreadTransitions) {
4011 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4012 return;
4013 }
4014 HandleMark hm(thread);
4015 Handle ct(thread, thread->threadObj());
4016
4017 if (JvmtiExport::should_post_vthread_unmount()) {
4018 JvmtiExport::post_vthread_unmount(vthread);
4019 }
4020 if (last_unmount) {
4021 if (JvmtiExport::can_support_virtual_threads()) {
4022 if (JvmtiExport::should_post_vthread_end()) {
4023 JvmtiExport::post_vthread_end(vthread);
4024 }
4025 } else { // compatibility for vthread unaware agents: legacy thread_end
4026 if (PostVirtualThreadCompatibleLifecycleEvents &&
4027 JvmtiExport::should_post_thread_life()) {
4028 JvmtiExport::post_thread_end(thread);
4029 }
4030 }
4031 }
4032 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
4033 assert(!thread->is_in_VTMS_transition(), "sanity check");
4034 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ false);
4035
4036 if (last_unmount && thread->jvmti_thread_state() != NULL) {
4037 JvmtiExport::cleanup_thread(thread);
4038 thread->set_jvmti_thread_state(NULL);
4039 oop vt = JNIHandles::resolve(vthread);
4040 java_lang_Thread::set_jvmti_thread_state(vt, NULL);
4041 }
4042 thread->rebind_to_jvmti_thread_state_of(ct());
4043 #else
4044 fatal("Should only be called with JVMTI enabled");
4045 #endif
4046 JVM_END
4047
4048 JVM_ENTRY(void, JVM_VirtualThreadUnmountEnd(JNIEnv* env, jobject vthread, jboolean last_unmount))
4049 #if INCLUDE_JVMTI
4050 if (!DoJVMTIVirtualThreadTransitions) {
4051 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4052 return;
4053 }
4054 assert(thread->is_in_VTMS_transition(), "sanity check");
4055 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
4056 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ false);
4057 #else
4058 fatal("Should only be called with JVMTI enabled");
4059 #endif
4060 JVM_END
4061
4062 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
4063 #if INCLUDE_JVMTI
4064 if (!DoJVMTIVirtualThreadTransitions) {
4065 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4066 return;
4067 }
4068 assert(!thread->is_in_VTMS_transition(), "sanity check");
4069 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
4070 thread->toggle_is_in_tmp_VTMS_transition();
4071 #else
4072 fatal("Should only be called with JVMTI enabled");
4073 #endif
4074 JVM_END
4075
4076 /*
4077 * Return the current class's class file version. The low order 16 bits of the
4078 * returned jint contain the class's major version. The high order 16 bits
4079 * contain the class's minor version.
4080 */
4081 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4082 oop mirror = JNIHandles::resolve_non_null(current);
4083 if (java_lang_Class::is_primitive(mirror)) {
4084 // return latest major version and minor version of 0.
4085 return JVM_CLASSFILE_MAJOR_VERSION;
4086 }
4087 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4088
4089 Klass* c = java_lang_Class::as_Klass(mirror);
4090 assert(c->is_instance_klass(), "must be");
4091 InstanceKlass* ik = InstanceKlass::cast(c);
4092 return (ik->minor_version() << 16) | ik->major_version();
4093 JVM_END